res/res_rtp_asterisk.c

   1 /*
   2  * Asterisk -- An open source telephony toolkit.
   3  *
   4  * Copyright (C) 1999 - 2008, Digium, Inc.
   5  *
   6  * Mark Spencer <markster@digium.com>
   7  *
   8  * See http://www.asterisk.org for more information about
   9  * the Asterisk project. Please do not directly contact
  10  * any of the maintainers of this project for assistance;
  11  * the project provides a web site, mailing lists and IRC
  12  * channels for your use.
  13  *
  14  * This program is free software, distributed under the terms of
  15  * the GNU General Public License Version 2. See the LICENSE file
  16  * at the top of the source tree.
  17  */
  18
  19 /*!
  20  * \file
  21  *
  22  * \brief Supports RTP and RTCP with Symmetric RTP support for NAT traversal.
  23  *
  24  * \author Mark Spencer <markster@digium.com>
  25  *
  26  * \note RTP is defined in RFC 3550.
  27  *
  28  * \ingroup rtp_engines
  29  */
  30
  31 /*** MODULEINFO
  32         <use type="external">pjproject</use>
  33         <support_level>core</support_level>
  34  ***/
  35
  36 #include "asterisk.h"
  37
  38 ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
  39
  40 #include <sys/time.h>
  41 #include <signal.h>
  42 #include <fcntl.h>
  43
  44 #ifdef HAVE_OPENSSL_SRTP
  45 #include <openssl/ssl.h>
  46 #include <openssl/err.h>
  47 #include <openssl/bio.h>
  48 #endif
  49
  50 #ifdef HAVE_PJPROJECT
  51 #include <pjlib.h>
  52 #include <pjlib-util.h>
  53 #include <pjnath.h>
  54 #endif
  55
  56 #include "asterisk/stun.h"
  57 #include "asterisk/pbx.h"
  58 #include "asterisk/frame.h"
  59 #include "asterisk/channel.h"
  60 #include "asterisk/acl.h"
  61 #include "asterisk/config.h"
  62 #include "asterisk/lock.h"
  63 #include "asterisk/utils.h"
  64 #include "asterisk/cli.h"
  65 #include "asterisk/manager.h"
  66 #include "asterisk/unaligned.h"
  67 #include "asterisk/module.h"
  68 #include "asterisk/rtp_engine.h"
  69 #include "asterisk/test.h"
  70
  71 #define MAX_TIMESTAMP_SKEW      640
  72
  73 #define RTP_SEQ_MOD     (1<<16) /*!< A sequence number can't be more than 16 bits */
  74 #define RTCP_DEFAULT_INTERVALMS   5000  /*!< Default milli-seconds between RTCP reports we send */
  75 #define RTCP_MIN_INTERVALMS       500   /*!< Min milli-seconds between RTCP reports we send */
  76 #define RTCP_MAX_INTERVALMS       60000 /*!< Max milli-seconds between RTCP reports we send */
  77
  78 #define DEFAULT_RTP_START 5000 /*!< Default port number to start allocating RTP ports from */
  79 #define DEFAULT_RTP_END 31000  /*!< Default maximum port number to end allocating RTP ports at */
  80
  81 #define MINIMUM_RTP_PORT 1024 /*!< Minimum port number to accept */
  82 #define MAXIMUM_RTP_PORT 65535 /*!< Maximum port number to accept */
  83
  84 #define DEFAULT_TURN_PORT 34780
  85
  86 #define TURN_ALLOCATION_WAIT_TIME 2000
  87
  88 #define RTCP_PT_FUR     192
  89 #define RTCP_PT_SR      AST_RTP_RTCP_SR
  90 #define RTCP_PT_RR      AST_RTP_RTCP_RR
  91 #define RTCP_PT_SDES    202
  92 #define RTCP_PT_BYE     203
  93 #define RTCP_PT_APP     204
  94 /* VP8: RTCP Feedback */
  95 #define RTCP_PT_PSFB    206
  96
  97 #define RTP_MTU         1200
  98 #define DTMF_SAMPLE_RATE_MS    8 /*!< DTMF samples per millisecond */
  99
 100 #define DEFAULT_DTMF_TIMEOUT (150 * (8000 / 1000))      /*!< samples */
 101
 102 #define ZFONE_PROFILE_ID 0x505a
 103
 104 #define DEFAULT_LEARNING_MIN_SEQUENTIAL 4
 105
 106 #define SRTP_MASTER_KEY_LEN 16
 107 #define SRTP_MASTER_SALT_LEN 14
 108 #define SRTP_MASTER_LEN (SRTP_MASTER_KEY_LEN + SRTP_MASTER_SALT_LEN)
 109
 110 enum strict_rtp_state {
 111         STRICT_RTP_OPEN = 0, /*! No RTP packets should be dropped, all sources accepted */
 112         STRICT_RTP_LEARN,    /*! Accept next packet as source */
 113         STRICT_RTP_CLOSED,   /*! Drop all RTP packets not coming from source that was learned */
 114 };
 115
 116 #define DEFAULT_STRICT_RTP STRICT_RTP_CLOSED
 117 #define DEFAULT_ICESUPPORT 1
 118
 119 extern struct ast_srtp_res *res_srtp;
 120 extern struct ast_srtp_policy_res *res_srtp_policy;
 121
 122 static int dtmftimeout = DEFAULT_DTMF_TIMEOUT;
 123
 124 static int rtpstart = DEFAULT_RTP_START;                        /*!< First port for RTP sessions (set in rtp.conf) */
 125 static int rtpend = DEFAULT_RTP_END;                    /*!< Last port for RTP sessions (set in rtp.conf) */
 126 static int rtpdebug;                    /*!< Are we debugging? */
 127 static int rtcpdebug;                   /*!< Are we debugging RTCP? */
 128 static int rtcpstats;                   /*!< Are we debugging RTCP? */
 129 static int rtcpinterval = RTCP_DEFAULT_INTERVALMS; /*!< Time between rtcp reports in millisecs */
 130 static struct ast_sockaddr rtpdebugaddr;        /*!< Debug packets to/from this host */
 131 static struct ast_sockaddr rtcpdebugaddr;       /*!< Debug RTCP packets to/from this host */
 132 static int rtpdebugport;                /*< Debug only RTP packets from IP or IP+Port if port is > 0 */
 133 static int rtcpdebugport;               /*< Debug only RTCP packets from IP or IP+Port if port is > 0 */
 134 #ifdef SO_NO_CHECK
 135 static int nochecksums;
 136 #endif
 137 static int strictrtp = DEFAULT_STRICT_RTP; /*< Only accept RTP frames from a defined source. If we receive an indication of a changing source, enter learning mode. */
 138 static int learning_min_sequential = DEFAULT_LEARNING_MIN_SEQUENTIAL; /*< Number of sequential RTP frames needed from a single source during learning mode to accept new source. */
 139 #ifdef HAVE_PJPROJECT
 140 static int icesupport = DEFAULT_ICESUPPORT;
 141 static struct sockaddr_in stunaddr;
 142 static pj_str_t turnaddr;
 143 static int turnport = DEFAULT_TURN_PORT;
 144 static pj_str_t turnusername;
 145 static pj_str_t turnpassword;
 146
 147 /*! \brief Pool factory used by pjlib to allocate memory. */
 148 static pj_caching_pool cachingpool;
 149
 150 /*! \brief Pool used by pjlib functions which require memory allocation. */
 151 static pj_pool_t *pool;
 152
 153 /*! \brief I/O queue for TURN relay traffic */
 154 static pj_ioqueue_t *ioqueue;
 155
 156 /*! \brief Timer heap for ICE and TURN stuff */
 157 static pj_timer_heap_t *timerheap;
 158
 159 /*! \brief Worker thread for ICE/TURN */
 160 static pj_thread_t *thread;
 161
 162 /*! \brief Notification that the ICE/TURN worker thread should stop */
 163 static int worker_terminate;
 164 #endif
 165
 166 #define FLAG_3389_WARNING               (1 << 0)
 167 #define FLAG_NAT_ACTIVE                 (3 << 1)
 168 #define FLAG_NAT_INACTIVE               (0 << 1)
 169 #define FLAG_NAT_INACTIVE_NOWARN        (1 << 1)
 170 #define FLAG_NEED_MARKER_BIT            (1 << 3)
 171 #define FLAG_DTMF_COMPENSATE            (1 << 4)
 172
 173 #define TRANSPORT_SOCKET_RTP 1
 174 #define TRANSPORT_SOCKET_RTCP 2
 175 #define TRANSPORT_TURN_RTP 3
 176 #define TRANSPORT_TURN_RTCP 4
 177
 178 /*! \brief RTP learning mode tracking information */
 179 struct rtp_learning_info {
 180         int max_seq;    /*!< The highest sequence number received */
 181         int packets;    /*!< The number of remaining packets before the source is accepted */
 182 };
 183
 184 /*! \brief RTP session description */
 185 struct ast_rtp {
 186         int s;
 187         struct ast_frame f;
 188         unsigned char rawdata[8192 + AST_FRIENDLY_OFFSET];
 189         unsigned int ssrc;              /*!< Synchronization source, RFC 3550, page 10. */
 190         unsigned int themssrc;          /*!< Their SSRC */
 191         unsigned int rxssrc;
 192         unsigned int lastts;
 193         unsigned int lastrxts;
 194         unsigned int lastividtimestamp;
 195         unsigned int lastovidtimestamp;
 196         unsigned int lastitexttimestamp;
 197         unsigned int lastotexttimestamp;
 198         unsigned int lasteventseqn;
 199         int lastrxseqno;                /*!< Last received sequence number */
 200         unsigned short seedrxseqno;     /*!< What sequence number did they start with?*/
 201         unsigned int seedrxts;          /*!< What RTP timestamp did they start with? */
 202         unsigned int rxcount;           /*!< How many packets have we received? */
 203         unsigned int rxoctetcount;      /*!< How many octets have we received? should be rxcount *160*/
 204         unsigned int txcount;           /*!< How many packets have we sent? */
 205         unsigned int txoctetcount;      /*!< How many octets have we sent? (txcount*160)*/
 206         unsigned int cycles;            /*!< Shifted count of sequence number cycles */
 207         double rxjitter;                /*!< Interarrival jitter at the moment in seconds */
 208         double rxtransit;               /*!< Relative transit time for previous packet */
 209         struct ast_format lasttxformat;
 210         struct ast_format lastrxformat;
 211
 212         int rtptimeout;                 /*!< RTP timeout time (negative or zero means disabled, negative value means temporarily disabled) */
 213         int rtpholdtimeout;             /*!< RTP timeout when on hold (negative or zero means disabled, negative value means temporarily disabled). */
 214         int rtpkeepalive;               /*!< Send RTP comfort noice packets for keepalive */
 215
 216         /* DTMF Reception Variables */
 217         char resp;                        /*!< The current digit being processed */
 218         unsigned int last_seqno;          /*!< The last known sequence number for any DTMF packet */
 219         unsigned int last_end_timestamp;  /*!< The last known timestamp received from an END packet */
 220         unsigned int dtmf_duration;       /*!< Total duration in samples since the digit start event */
 221         unsigned int dtmf_timeout;        /*!< When this timestamp is reached we consider END frame lost and forcibly abort digit */
 222         unsigned int dtmfsamples;
 223         enum ast_rtp_dtmf_mode dtmfmode;  /*!< The current DTMF mode of the RTP stream */
 224         /* DTMF Transmission Variables */
 225         unsigned int lastdigitts;
 226         char sending_digit;     /*!< boolean - are we sending digits */
 227         char send_digit;        /*!< digit we are sending */
 228         int send_payload;
 229         int send_duration;
 230         unsigned int flags;
 231         struct timeval rxcore;
 232         struct timeval txcore;
 233         double drxcore;                 /*!< The double representation of the first received packet */
 234         struct timeval lastrx;          /*!< timeval when we last received a packet */
 235         struct timeval dtmfmute;
 236         struct ast_smoother *smoother;
 237         int *ioid;
 238         unsigned short seqno;           /*!< Sequence number, RFC 3550, page 13. */
 239         unsigned short rxseqno;
 240         struct ast_sched_context *sched;
 241         struct io_context *io;
 242         void *data;
 243         struct ast_rtcp *rtcp;
 244         struct ast_rtp *bridged;        /*!< Who we are Packet bridged to */
 245
 246         enum strict_rtp_state strict_rtp_state; /*!< Current state that strict RTP protection is in */
 247         struct ast_sockaddr strict_rtp_address;  /*!< Remote address information for strict RTP purposes */
 248
 249         /*
 250          * Learning mode values based on pjmedia's probation mode.  Many of these values are redundant to the above,
 251          * but these are in place to keep learning mode sequence values sealed from their normal counterparts.
 252          */
 253         struct rtp_learning_info rtp_source_learn;      /* Learning mode track for the expected RTP source */
 254         struct rtp_learning_info alt_source_learn;      /* Learning mode tracking for a new RTP source after one has been chosen */
 255
 256         struct rtp_red *red;
 257
 258         ast_mutex_t lock;           /*!< Lock for synchronization purposes */
 259         ast_cond_t cond;            /*!< Condition for signaling */
 260
 261 #ifdef HAVE_PJPROJECT
 262         pj_ice_sess *ice;           /*!< ICE session */
 263         pj_turn_sock *turn_rtp;     /*!< RTP TURN relay */
 264         pj_turn_sock *turn_rtcp;    /*!< RTCP TURN relay */
 265         pj_turn_state_t turn_state; /*!< Current state of the TURN relay session */
 266         unsigned int passthrough:1; /*!< Bit to indicate that the received packet should be passed through */
 267         unsigned int ice_port;      /*!< Port that ICE was started with if it was previously started */
 268
 269         char remote_ufrag[256];  /*!< The remote ICE username */
 270         char remote_passwd[256]; /*!< The remote ICE password */
 271
 272         char local_ufrag[256];  /*!< The local ICE username */
 273         char local_passwd[256]; /*!< The local ICE password */
 274
 275         struct ao2_container *ice_local_candidates;           /*!< The local ICE candidates */
 276         struct ao2_container *ice_active_remote_candidates;   /*!< The remote ICE candidates */
 277         struct ao2_container *ice_proposed_remote_candidates; /*!< Incoming remote ICE candidates for new session */
 278         struct ast_sockaddr ice_original_rtp_addr;            /*!< rtp address that ICE started on first session */
 279 #endif
 280
 281 #ifdef HAVE_OPENSSL_SRTP
 282         SSL_CTX *ssl_ctx; /*!< SSL context */
 283         SSL *ssl;         /*!< SSL session */
 284         BIO *read_bio;    /*!< Memory buffer for reading */
 285         BIO *write_bio;   /*!< Memory buffer for writing */
 286         enum ast_rtp_dtls_setup dtls_setup; /*!< Current setup state */
 287         enum ast_srtp_suite suite;   /*!< SRTP crypto suite */
 288         char local_fingerprint[160]; /*!< Fingerprint of our certificate */
 289         unsigned char remote_fingerprint[EVP_MAX_MD_SIZE]; /*!< Fingerprint of the peer certificate */
 290         enum ast_rtp_dtls_connection connection; /*!< Whether this is a new or existing connection */
 291         unsigned int dtls_failure:1; /*!< Failure occurred during DTLS negotiation */
 292         unsigned int rekey; /*!< Interval at which to renegotiate and rekey */
 293         int rekeyid; /*!< Scheduled item id for rekeying */
 294 #endif
 295 };
 296
 297 /*!
 298  * \brief Structure defining an RTCP session.
 299  *
 300  * The concept "RTCP session" is not defined in RFC 3550, but since
 301  * this structure is analogous to ast_rtp, which tracks a RTP session,
 302  * it is logical to think of this as a RTCP session.
 303  *
 304  * RTCP packet is defined on page 9 of RFC 3550.
 305  *
 306  */
 307 struct ast_rtcp {
 308         int rtcp_info;
 309         int s;                          /*!< Socket */
 310         struct ast_sockaddr us;         /*!< Socket representation of the local endpoint. */
 311         struct ast_sockaddr them;       /*!< Socket representation of the remote endpoint. */
 312         unsigned int soc;               /*!< What they told us */
 313         unsigned int spc;               /*!< What they told us */
 314         unsigned int themrxlsr;         /*!< The middle 32 bits of the NTP timestamp in the last received SR*/
 315         struct timeval rxlsr;           /*!< Time when we got their last SR */
 316         struct timeval txlsr;           /*!< Time when we sent or last SR*/
 317         unsigned int expected_prior;    /*!< no. packets in previous interval */
 318         unsigned int received_prior;    /*!< no. packets received in previous interval */
 319         int schedid;                    /*!< Schedid returned from ast_sched_add() to schedule RTCP-transmissions*/
 320         unsigned int rr_count;          /*!< number of RRs we've sent, not including report blocks in SR's */
 321         unsigned int sr_count;          /*!< number of SRs we've sent */
 322         unsigned int lastsrtxcount;     /*!< Transmit packet count when last SR sent */
 323         double accumulated_transit;     /*!< accumulated a-dlsr-lsr */
 324         double rtt;                     /*!< Last reported rtt */
 325         unsigned int reported_jitter;   /*!< The contents of their last jitter entry in the RR */
 326         unsigned int reported_lost;     /*!< Reported lost packets in their RR */
 327
 328         double reported_maxjitter;
 329         double reported_minjitter;
 330         double reported_normdev_jitter;
 331         double reported_stdev_jitter;
 332         unsigned int reported_jitter_count;
 333
 334         double reported_maxlost;
 335         double reported_minlost;
 336         double reported_normdev_lost;
 337         double reported_stdev_lost;
 338
 339         double rxlost;
 340         double maxrxlost;
 341         double minrxlost;
 342         double normdev_rxlost;
 343         double stdev_rxlost;
 344         unsigned int rxlost_count;
 345
 346         double maxrxjitter;
 347         double minrxjitter;
 348         double normdev_rxjitter;
 349         double stdev_rxjitter;
 350         unsigned int rxjitter_count;
 351         double maxrtt;
 352         double minrtt;
 353         double normdevrtt;
 354         double stdevrtt;
 355         unsigned int rtt_count;
 356
 357         /* VP8: sequence number for the RTCP FIR FCI */
 358         int firseq;
 359 };
 360
 361 struct rtp_red {
 362         struct ast_frame t140;  /*!< Primary data  */
 363         struct ast_frame t140red;   /*!< Redundant t140*/
 364         unsigned char pt[AST_RED_MAX_GENERATION];  /*!< Payload types for redundancy data */
 365         unsigned char ts[AST_RED_MAX_GENERATION]; /*!< Time stamps */
 366         unsigned char len[AST_RED_MAX_GENERATION]; /*!< length of each generation */
 367         int num_gen; /*!< Number of generations */
 368         int schedid; /*!< Timer id */
 369         int ti; /*!< How long to buffer data before send */
 370         unsigned char t140red_data[64000];
 371         unsigned char buf_data[64000]; /*!< buffered primary data */
 372         int hdrlen;
 373         long int prev_ts;
 374 };
 375
 376 AST_LIST_HEAD_NOLOCK(frame_list, ast_frame);
 377
 378 /* Forward Declarations */
 379 static int ast_rtp_new(struct ast_rtp_instance *instance, struct ast_sched_context *sched, struct ast_sockaddr *addr, void *data);
 380 static int ast_rtp_destroy(struct ast_rtp_instance *instance);
 381 static int ast_rtp_dtmf_begin(struct ast_rtp_instance *instance, char digit);
 382 static int ast_rtp_dtmf_end(struct ast_rtp_instance *instance, char digit);
 383 static int ast_rtp_dtmf_end_with_duration(struct ast_rtp_instance *instance, char digit, unsigned int duration);
 384 static int ast_rtp_dtmf_mode_set(struct ast_rtp_instance *instance, enum ast_rtp_dtmf_mode dtmf_mode);
 385 static enum ast_rtp_dtmf_mode ast_rtp_dtmf_mode_get(struct ast_rtp_instance *instance);
 386 static void ast_rtp_update_source(struct ast_rtp_instance *instance);
 387 static void ast_rtp_change_source(struct ast_rtp_instance *instance);
 388 static int ast_rtp_write(struct ast_rtp_instance *instance, struct ast_frame *frame);
 389 static struct ast_frame *ast_rtp_read(struct ast_rtp_instance *instance, int rtcp);
 390 static void ast_rtp_prop_set(struct ast_rtp_instance *instance, enum ast_rtp_property property, int value);
 391 static int ast_rtp_fd(struct ast_rtp_instance *instance, int rtcp);
 392 static void ast_rtp_remote_address_set(struct ast_rtp_instance *instance, struct ast_sockaddr *addr);
 393 static int rtp_red_init(struct ast_rtp_instance *instance, int buffer_time, int *payloads, int generations);
 394 static int rtp_red_buffer(struct ast_rtp_instance *instance, struct ast_frame *frame);
 395 static int ast_rtp_local_bridge(struct ast_rtp_instance *instance0, struct ast_rtp_instance *instance1);
 396 static int ast_rtp_get_stat(struct ast_rtp_instance *instance, struct ast_rtp_instance_stats *stats, enum ast_rtp_instance_stat stat);
 397 static int ast_rtp_dtmf_compatible(struct ast_channel *chan0, struct ast_rtp_instance *instance0, struct ast_channel *chan1, struct ast_rtp_instance *instance1);
 398 static void ast_rtp_stun_request(struct ast_rtp_instance *instance, struct ast_sockaddr *suggestion, const char *username);
 399 static void ast_rtp_stop(struct ast_rtp_instance *instance);
 400 static int ast_rtp_qos_set(struct ast_rtp_instance *instance, int tos, int cos, const char* desc);
 401 static int ast_rtp_sendcng(struct ast_rtp_instance *instance, int level);
 402
 403 #ifdef HAVE_OPENSSL_SRTP
 404 static int ast_rtp_activate(struct ast_rtp_instance *instance);
 405 #endif
 406
 407 static int __rtp_sendto(struct ast_rtp_instance *instance, void *buf, size_t size, int flags, struct ast_sockaddr *sa, int rtcp, int *ice, int use_srtp);
 408
 409 /*! \brief Helper function which updates an ast_sockaddr with the candidate used for the component */
 410 static void update_address_with_ice_candidate(struct ast_rtp *rtp, int component, struct ast_sockaddr *cand_address)
 411 {
 412 #ifdef HAVE_PJPROJECT
 413         char address[PJ_INET6_ADDRSTRLEN];
 414
 415         if (!rtp->ice || (component < 1) || !rtp->ice->comp[component - 1].valid_check) {
 416                 return;
 417         }
 418
 419         ast_sockaddr_parse(cand_address, pj_sockaddr_print(&rtp->ice->comp[component - 1].valid_check->rcand->addr, address, sizeof(address), 0), 0);
 420         ast_sockaddr_set_port(cand_address, pj_sockaddr_get_port(&rtp->ice->comp[component - 1].valid_check->rcand->addr));
 421 #endif
 422 }
 423
 424 #ifdef HAVE_PJPROJECT
 425 /*! \brief Destructor for locally created ICE candidates */
 426 static void ast_rtp_ice_candidate_destroy(void *obj)
 427 {
 428         struct ast_rtp_engine_ice_candidate *candidate = obj;
 429
 430         if (candidate->foundation) {
 431                 ast_free(candidate->foundation);
 432         }
 433
 434         if (candidate->transport) {
 435                 ast_free(candidate->transport);
 436         }
 437 }
 438
 439 static void ast_rtp_ice_set_authentication(struct ast_rtp_instance *instance, const char *ufrag, const char *password)
 440 {
 441         struct ast_rtp *rtp = ast_rtp_instance_get_data(instance);
 442
 443         if (!ast_strlen_zero(ufrag)) {
 444                 ast_copy_string(rtp->remote_ufrag, ufrag, sizeof(rtp->remote_ufrag));
 445         }
 446
 447         if (!ast_strlen_zero(password)) {
 448                 ast_copy_string(rtp->remote_passwd, password, sizeof(rtp->remote_passwd));
 449         }
 450 }
 451
 452 static int ice_candidate_cmp(void *obj, void *arg, int flags)
 453 {
 454         struct ast_rtp_engine_ice_candidate *candidate1 = obj, *candidate2 = arg;
 455
 456         if (strcmp(candidate1->foundation, candidate2->foundation) ||
 457                         candidate1->id != candidate2->id ||
 458                         ast_sockaddr_cmp(&candidate1->address, &candidate2->address) ||
 459                         candidate1->type != candidate1->type) {
 460                 return 0;
 461         }
 462
 463         return CMP_MATCH | CMP_STOP;
 464 }
 465
 466 static void ast_rtp_ice_add_remote_candidate(struct ast_rtp_instance *instance, const struct ast_rtp_engine_ice_candidate *candidate)
 467 {
 468         struct ast_rtp *rtp = ast_rtp_instance_get_data(instance);
 469         struct ast_rtp_engine_ice_candidate *remote_candidate;
 470
 471         if (!rtp->ice_proposed_remote_candidates &&
 472                         !(rtp->ice_proposed_remote_candidates = ao2_container_alloc(1, NULL, ice_candidate_cmp))) {
 473                 return;
 474         }
 475
 476         /* If this is going to exceed the maximum number of ICE candidates don't even add it */
 477         if (ao2_container_count(rtp->ice_proposed_remote_candidates) == PJ_ICE_MAX_CAND) {
 478                 return;
 479         }
 480
 481         if (!(remote_candidate = ao2_alloc(sizeof(*remote_candidate), ast_rtp_ice_candidate_destroy))) {
 482                 return;
 483         }
 484
 485         remote_candidate->foundation = ast_strdup(candidate->foundation);
 486         remote_candidate->id = candidate->id;
 487         remote_candidate->transport = ast_strdup(candidate->transport);
 488         remote_candidate->priority = candidate->priority;
 489         ast_sockaddr_copy(&remote_candidate->address, &candidate->address);
 490         ast_sockaddr_copy(&remote_candidate->relay_address, &candidate->relay_address);
 491         remote_candidate->type = candidate->type;
 492
 493         ao2_link(rtp->ice_proposed_remote_candidates, remote_candidate);
 494         ao2_ref(remote_candidate, -1);
 495 }
 496
 497 AST_THREADSTORAGE(pj_thread_storage);
 498
 499 /*! \brief Function used to check if the calling thread is registered with pjlib. If it is not it will be registered. */
 500 static void pj_thread_register_check(void)
 501 {
 502         pj_thread_desc *desc;
 503         pj_thread_t *thread;
 504
 505         if (pj_thread_is_registered() == PJ_TRUE) {
 506                 return;
 507         }
 508
 509         desc = ast_threadstorage_get(&pj_thread_storage, sizeof(pj_thread_desc));
 510         if (!desc) {
 511                 ast_log(LOG_ERROR, "Could not get thread desc from thread-local storage. Expect awful things to occur\n");
 512                 return;
 513         }
 514         pj_bzero(*desc, sizeof(*desc));
 515
 516         if (pj_thread_register("Asterisk Thread", *desc, &thread) != PJ_SUCCESS) {
 517                 ast_log(LOG_ERROR, "Coudln't register thread with PJLIB.\n");
 518         }
 519         return;
 520 }
 521
 522 static int ice_create(struct ast_rtp_instance *instance, struct ast_sockaddr *addr,
 523         int port, int replace);
 524
 525 static void ast_rtp_ice_stop(struct ast_rtp_instance *instance)
 526 {
 527         struct ast_rtp *rtp = ast_rtp_instance_get_data(instance);
 528
 529         if (!rtp->ice) {
 530                 return;
 531         }
 532
 533         pj_thread_register_check();
 534
 535         pj_ice_sess_destroy(rtp->ice);
 536         rtp->ice = NULL;
 537 }
 538
 539 static int ice_reset_session(struct ast_rtp_instance *instance)
 540 {
 541         struct ast_rtp *rtp = ast_rtp_instance_get_data(instance);
 542
 543         ast_rtp_ice_stop(instance);
 544         return ice_create(instance, &rtp->ice_original_rtp_addr, rtp->ice_port, 1);
 545 }
 546
 547 static int ice_candidates_compare(struct ao2_container *left, struct ao2_container *right)
 548 {
 549         struct ao2_iterator i;
 550         struct ast_rtp_engine_ice_candidate *right_candidate;
 551
 552         if (ao2_container_count(left) != ao2_container_count(right)) {
 553                 return -1;
 554         }
 555
 556         i = ao2_iterator_init(right, 0);
 557         while ((right_candidate = ao2_iterator_next(&i))) {
 558                 struct ast_rtp_engine_ice_candidate *left_candidate = ao2_find(left, right_candidate, OBJ_POINTER);
 559
 560                 if (!left_candidate) {
 561                         ao2_ref(right_candidate, -1);
 562                         ao2_iterator_destroy(&i);
 563                         return -1;
 564                 }
 565
 566                 ao2_ref(left_candidate, -1);
 567                 ao2_ref(right_candidate, -1);
 568         }
 569         ao2_iterator_destroy(&i);
 570
 571         return 0;
 572 }
 573
 574 static void ast_rtp_ice_start(struct ast_rtp_instance *instance)
 575 {
 576         struct ast_rtp *rtp = ast_rtp_instance_get_data(instance);
 577         pj_str_t ufrag = pj_str(rtp->remote_ufrag), passwd = pj_str(rtp->remote_passwd);
 578         pj_ice_sess_cand candidates[PJ_ICE_MAX_CAND];
 579         struct ao2_iterator i;
 580         struct ast_rtp_engine_ice_candidate *candidate;
 581         int cand_cnt = 0;
 582
 583         if (!rtp->ice || !rtp->ice_proposed_remote_candidates) {
 584                 return;
 585         }
 586
 587         /* Check for equivalence in the lists */
 588         if (rtp->ice_active_remote_candidates &&
 589                         !ice_candidates_compare(rtp->ice_proposed_remote_candidates, rtp->ice_active_remote_candidates)) {
 590                 ao2_cleanup(rtp->ice_proposed_remote_candidates);
 591                 rtp->ice_proposed_remote_candidates = NULL;
 592                 return;
 593         }
 594
 595         /* Out with the old, in with the new */
 596         ao2_cleanup(rtp->ice_active_remote_candidates);
 597         rtp->ice_active_remote_candidates = rtp->ice_proposed_remote_candidates;
 598         rtp->ice_proposed_remote_candidates = NULL;
 599
 600         /* Reset the ICE session. Is this going to work? */
 601         if (ice_reset_session(instance)) {
 602                 ast_log(LOG_NOTICE, "Failed to create replacement ICE session\n");
 603                 return;
 604         }
 605
 606         pj_thread_register_check();
 607
 608         i = ao2_iterator_init(rtp->ice_active_remote_candidates, 0);
 609
 610         while ((candidate = ao2_iterator_next(&i)) && (cand_cnt < PJ_ICE_MAX_CAND)) {
 611                 pj_str_t address;
 612
 613                 pj_strdup2(rtp->ice->pool, &candidates[cand_cnt].foundation, candidate->foundation);
 614                 candidates[cand_cnt].comp_id = candidate->id;
 615                 candidates[cand_cnt].prio = candidate->priority;
 616
 617                 pj_sockaddr_parse(pj_AF_UNSPEC(), 0, pj_cstr(&address, ast_sockaddr_stringify(&candidate->address)), &candidates[cand_cnt].addr);
 618
 619                 if (!ast_sockaddr_isnull(&candidate->relay_address)) {
 620                         pj_sockaddr_parse(pj_AF_UNSPEC(), 0, pj_cstr(&address, ast_sockaddr_stringify(&candidate->relay_address)), &candidates[cand_cnt].rel_addr);
 621                 }
 622
 623                 if (candidate->type == AST_RTP_ICE_CANDIDATE_TYPE_HOST) {
 624                         candidates[cand_cnt].type = PJ_ICE_CAND_TYPE_HOST;
 625                 } else if (candidate->type == AST_RTP_ICE_CANDIDATE_TYPE_SRFLX) {
 626                         candidates[cand_cnt].type = PJ_ICE_CAND_TYPE_SRFLX;
 627                 } else if (candidate->type == AST_RTP_ICE_CANDIDATE_TYPE_RELAYED) {
 628                         candidates[cand_cnt].type = PJ_ICE_CAND_TYPE_RELAYED;
 629                 }
 630
 631                 if (candidate->id == AST_RTP_ICE_COMPONENT_RTP && rtp->turn_rtp) {
 632                         pj_turn_sock_set_perm(rtp->turn_rtp, 1, &candidates[cand_cnt].addr, 1);
 633                 } else if (candidate->id == AST_RTP_ICE_COMPONENT_RTCP && rtp->turn_rtcp) {
 634                         pj_turn_sock_set_perm(rtp->turn_rtcp, 1, &candidates[cand_cnt].addr, 1);
 635                 }
 636
 637                 cand_cnt++;
 638                 ao2_ref(candidate, -1);
 639         }
 640
 641         ao2_iterator_destroy(&i);
 642
 643         if (pj_ice_sess_create_check_list(rtp->ice, &ufrag, &passwd, ao2_container_count(rtp->ice_active_remote_candidates), &candidates[0]) == PJ_SUCCESS) {
 644                 ast_test_suite_event_notify("ICECHECKLISTCREATE", "Result: SUCCESS");
 645                 pj_ice_sess_start_check(rtp->ice);
 646                 pj_timer_heap_poll(timerheap, NULL);
 647                 rtp->strict_rtp_state = STRICT_RTP_OPEN;
 648                 return;
 649         }
 650
 651         ast_test_suite_event_notify("ICECHECKLISTCREATE", "Result: FAILURE");
 652
 653         /* even though create check list failed don't stop ice as
 654            it might still work */
 655         ast_debug(1, "Failed to create ICE session check list\n");
 656         /* however we do need to reset remote candidates since
 657            this function may be re-entered */
 658         ao2_ref(rtp->ice_active_remote_candidates, -1);
 659         rtp->ice_active_remote_candidates = NULL;
 660         rtp->ice->rcand_cnt = rtp->ice->clist.count = 0;
 661 }
 662
 663 static const char *ast_rtp_ice_get_ufrag(struct ast_rtp_instance *instance)
 664 {
 665         struct ast_rtp *rtp = ast_rtp_instance_get_data(instance);
 666
 667         return rtp->local_ufrag;
 668 }
 669
 670 static const char *ast_rtp_ice_get_password(struct ast_rtp_instance *instance)
 671 {
 672         struct ast_rtp *rtp = ast_rtp_instance_get_data(instance);
 673
 674         return rtp->local_passwd;
 675 }
 676
 677 static struct ao2_container *ast_rtp_ice_get_local_candidates(struct ast_rtp_instance *instance)
 678 {
 679         struct ast_rtp *rtp = ast_rtp_instance_get_data(instance);
 680
 681         if (rtp->ice_local_candidates) {
 682                 ao2_ref(rtp->ice_local_candidates, +1);
 683         }
 684
 685         return rtp->ice_local_candidates;
 686 }
 687
 688 static void ast_rtp_ice_lite(struct ast_rtp_instance *instance)
 689 {
 690         struct ast_rtp *rtp = ast_rtp_instance_get_data(instance);
 691
 692         if (!rtp->ice) {
 693                 return;
 694         }
 695
 696         pj_thread_register_check();
 697
 698         pj_ice_sess_change_role(rtp->ice, PJ_ICE_SESS_ROLE_CONTROLLING);
 699 }
 700
 701 static void ast_rtp_ice_add_cand(struct ast_rtp *rtp, unsigned comp_id, unsigned transport_id, pj_ice_cand_type type, pj_uint16_t local_pref,
 702                                         const pj_sockaddr_t *addr, const pj_sockaddr_t *base_addr, const pj_sockaddr_t *rel_addr, int addr_len)
 703 {
 704         pj_str_t foundation;
 705         struct ast_rtp_engine_ice_candidate *candidate, *existing;
 706         char address[PJ_INET6_ADDRSTRLEN];
 707
 708         pj_thread_register_check();
 709
 710         pj_ice_calc_foundation(rtp->ice->pool, &foundation, type, addr);
 711
 712         if (!rtp->ice_local_candidates && !(rtp->ice_local_candidates = ao2_container_alloc(1, NULL, ice_candidate_cmp))) {
 713                 return;
 714         }
 715
 716         if (!(candidate = ao2_alloc(sizeof(*candidate), ast_rtp_ice_candidate_destroy))) {
 717                 return;
 718         }
 719
 720         candidate->foundation = ast_strndup(pj_strbuf(&foundation), pj_strlen(&foundation));
 721         candidate->id = comp_id;
 722         candidate->transport = ast_strdup("UDP");
 723
 724         ast_sockaddr_parse(&candidate->address, pj_sockaddr_print(addr, address, sizeof(address), 0), 0);
 725         ast_sockaddr_set_port(&candidate->address, pj_sockaddr_get_port(addr));
 726
 727         if (rel_addr) {
 728                 ast_sockaddr_parse(&candidate->relay_address, pj_sockaddr_print(rel_addr, address, sizeof(address), 0), 0);
 729                 ast_sockaddr_set_port(&candidate->relay_address, pj_sockaddr_get_port(rel_addr));
 730         }
 731
 732         if (type == PJ_ICE_CAND_TYPE_HOST) {
 733                 candidate->type = AST_RTP_ICE_CANDIDATE_TYPE_HOST;
 734         } else if (type == PJ_ICE_CAND_TYPE_SRFLX) {
 735                 candidate->type = AST_RTP_ICE_CANDIDATE_TYPE_SRFLX;
 736         } else if (type == PJ_ICE_CAND_TYPE_RELAYED) {
 737                 candidate->type = AST_RTP_ICE_CANDIDATE_TYPE_RELAYED;
 738         }
 739
 740         if ((existing = ao2_find(rtp->ice_local_candidates, candidate, OBJ_POINTER))) {
 741                 ao2_ref(existing, -1);
 742                 ao2_ref(candidate, -1);
 743                 return;
 744         }
 745
 746         if (pj_ice_sess_add_cand(rtp->ice, comp_id, transport_id, type, local_pref, &foundation, addr, base_addr, rel_addr, addr_len, NULL) != PJ_SUCCESS) {
 747                 ao2_ref(candidate, -1);
 748                 return;
 749         }
 750
 751         /* By placing the candidate into the ICE session it will have produced the priority, so update the local candidate with it */
 752         candidate->priority = rtp->ice->lcand[rtp->ice->lcand_cnt - 1].prio;
 753
 754         ao2_link(rtp->ice_local_candidates, candidate);
 755         ao2_ref(candidate, -1);
 756 }
 757
 758 static char *generate_random_string(char *buf, size_t size)
 759 {
 760         long val[4];
 761         int x;
 762
 763         for (x=0; x<4; x++) {
 764                 val[x] = ast_random();
 765         }
 766         snprintf(buf, size, "%08lx%08lx%08lx%08lx", val[0], val[1], val[2], val[3]);
 767
 768         return buf;
 769 }
 770
 771 /* ICE RTP Engine interface declaration */
 772 static struct ast_rtp_engine_ice ast_rtp_ice = {
 773         .set_authentication = ast_rtp_ice_set_authentication,
 774         .add_remote_candidate = ast_rtp_ice_add_remote_candidate,
 775         .start = ast_rtp_ice_start,
 776         .stop = ast_rtp_ice_stop,
 777         .get_ufrag = ast_rtp_ice_get_ufrag,
 778         .get_password = ast_rtp_ice_get_password,
 779         .get_local_candidates = ast_rtp_ice_get_local_candidates,
 780         .ice_lite = ast_rtp_ice_lite,
 781 };
 782 #endif
 783
 784 #ifdef HAVE_OPENSSL_SRTP
 785 static void dtls_info_callback(const SSL *ssl, int where, int ret)
 786 {
 787         struct ast_rtp *rtp = SSL_get_ex_data(ssl, 0);
 788
 789         /* We only care about alerts */
 790         if (!(where & SSL_CB_ALERT)) {
 791                 return;
 792         }
 793
 794         rtp->dtls_failure = 1;
 795 }
 796
 797 static int ast_rtp_dtls_set_configuration(struct ast_rtp_instance *instance, const struct ast_rtp_dtls_cfg *dtls_cfg)
 798 {
 799         struct ast_rtp *rtp = ast_rtp_instance_get_data(instance);
 800
 801         if (!dtls_cfg->enabled) {
 802                 return 0;
 803         }
 804
 805         if (!ast_rtp_engine_srtp_is_registered()) {
 806                 return -1;
 807         }
 808
 809         if (!(rtp->ssl_ctx = SSL_CTX_new(DTLSv1_method()))) {
 810                 return -1;
 811         }
 812
 813         SSL_CTX_set_verify(rtp->ssl_ctx, dtls_cfg->verify ? SSL_VERIFY_PEER | SSL_VERIFY_FAIL_IF_NO_PEER_CERT : SSL_VERIFY_NONE, NULL);
 814
 815         if (dtls_cfg->suite == AST_AES_CM_128_HMAC_SHA1_80) {
 816                 SSL_CTX_set_tlsext_use_srtp(rtp->ssl_ctx, "SRTP_AES128_CM_SHA1_80");
 817         } else if (dtls_cfg->suite == AST_AES_CM_128_HMAC_SHA1_32) {
 818                 SSL_CTX_set_tlsext_use_srtp(rtp->ssl_ctx, "SRTP_AES128_CM_SHA1_32");
 819         } else {
 820                 ast_log(LOG_ERROR, "Unsupported suite specified for DTLS-SRTP on RTP instance '%p'\n", instance);
 821                 goto error;
 822         }
 823
 824         if (!ast_strlen_zero(dtls_cfg->certfile)) {
 825                 char *private = ast_strlen_zero(dtls_cfg->pvtfile) ? dtls_cfg->certfile : dtls_cfg->pvtfile;
 826                 BIO *certbio;
 827                 X509 *cert;
 828                 unsigned int size, i;
 829                 unsigned char fingerprint[EVP_MAX_MD_SIZE];
 830                 char *local_fingerprint = rtp->local_fingerprint;
 831
 832                 if (!SSL_CTX_use_certificate_file(rtp->ssl_ctx, dtls_cfg->certfile, SSL_FILETYPE_PEM)) {
 833                         ast_log(LOG_ERROR, "Specified certificate file '%s' for RTP instance '%p' could not be used\n",
 834                                 dtls_cfg->certfile, instance);
 835                         goto error;
 836                 }
 837
 838                 if (!SSL_CTX_use_PrivateKey_file(rtp->ssl_ctx, private, SSL_FILETYPE_PEM) ||
 839                     !SSL_CTX_check_private_key(rtp->ssl_ctx)) {
 840                         ast_log(LOG_ERROR, "Specified private key file '%s' for RTP instance '%p' could not be used\n",
 841                                 private, instance);
 842                         goto error;
 843                 }
 844
 845                 if (!(certbio = BIO_new(BIO_s_file()))) {
 846                         ast_log(LOG_ERROR, "Failed to allocate memory for certificate fingerprinting on RTP instance '%p'\n",
 847                                 instance);
 848                         goto error;
 849                 }
 850
 851                 if (!BIO_read_filename(certbio, dtls_cfg->certfile) ||
 852                     !(cert = PEM_read_bio_X509(certbio, NULL, 0, NULL)) ||
 853                     !X509_digest(cert, EVP_sha1(), fingerprint, &size) ||
 854                     !size) {
 855                         ast_log(LOG_ERROR, "Could not produce fingerprint from certificate '%s' for RTP instance '%p'\n",
 856                                 dtls_cfg->certfile, instance);
 857                         BIO_free_all(certbio);
 858                         goto error;
 859                 }
 860
 861                 for (i = 0; i < size; i++) {
 862                         sprintf(local_fingerprint, "%.2X:", fingerprint[i]);
 863                         local_fingerprint += 3;
 864                 }
 865
 866                 *(local_fingerprint-1) = 0;
 867
 868                 BIO_free_all(certbio);
 869         }
 870
 871         if (!ast_strlen_zero(dtls_cfg->cipher)) {
 872                 if (!SSL_CTX_set_cipher_list(rtp->ssl_ctx, dtls_cfg->cipher)) {
 873                         ast_log(LOG_ERROR, "Invalid cipher specified in cipher list '%s' for RTP instance '%p'\n",
 874                                 dtls_cfg->cipher, instance);
 875                         goto error;
 876                 }
 877         }
 878
 879         if (!ast_strlen_zero(dtls_cfg->cafile) || !ast_strlen_zero(dtls_cfg->capath)) {
 880                 if (!SSL_CTX_load_verify_locations(rtp->ssl_ctx, S_OR(dtls_cfg->cafile, NULL), S_OR(dtls_cfg->capath, NULL))) {
 881                         ast_log(LOG_ERROR, "Invalid certificate authority file '%s' or path '%s' specified for RTP instance '%p'\n",
 882                                 S_OR(dtls_cfg->cafile, ""), S_OR(dtls_cfg->capath, ""), instance);
 883                         goto error;
 884                 }
 885         }
 886
 887         rtp->rekey = dtls_cfg->rekey;
 888         rtp->dtls_setup = dtls_cfg->default_setup;
 889         rtp->suite = dtls_cfg->suite;
 890
 891         if (!(rtp->ssl = SSL_new(rtp->ssl_ctx))) {
 892                 ast_log(LOG_ERROR, "Failed to allocate memory for SSL context on RTP instance '%p'\n",
 893                         instance);
 894                 goto error;
 895         }
 896
 897         SSL_set_ex_data(rtp->ssl, 0, rtp);
 898         SSL_set_info_callback(rtp->ssl, dtls_info_callback);
 899
 900         if (!(rtp->read_bio = BIO_new(BIO_s_mem()))) {
 901                 ast_log(LOG_ERROR, "Failed to allocate memory for inbound SSL traffic on RTP instance '%p'\n",
 902                         instance);
 903                 goto error;
 904         }
 905         BIO_set_mem_eof_return(rtp->read_bio, -1);
 906
 907         if (!(rtp->write_bio = BIO_new(BIO_s_mem()))) {
 908                 ast_log(LOG_ERROR, "Failed to allocate memory for outbound SSL traffic on RTP instance '%p'\n",
 909                         instance);
 910                 goto error;
 911         }
 912         BIO_set_mem_eof_return(rtp->write_bio, -1);
 913
 914         SSL_set_bio(rtp->ssl, rtp->read_bio, rtp->write_bio);
 915
 916         if (rtp->dtls_setup == AST_RTP_DTLS_SETUP_PASSIVE) {
 917                 SSL_set_accept_state(rtp->ssl);
 918         } else {
 919                 SSL_set_connect_state(rtp->ssl);
 920         }
 921
 922         rtp->connection = AST_RTP_DTLS_CONNECTION_NEW;
 923
 924         return 0;
 925
 926 error:
 927         if (rtp->read_bio) {
 928                 BIO_free(rtp->read_bio);
 929                 rtp->read_bio = NULL;
 930         }
 931
 932         if (rtp->write_bio) {
 933                 BIO_free(rtp->write_bio);
 934                 rtp->write_bio = NULL;
 935         }
 936
 937         if (rtp->ssl) {
 938                 SSL_free(rtp->ssl);
 939                 rtp->ssl = NULL;
 940         }
 941
 942         SSL_CTX_free(rtp->ssl_ctx);
 943         rtp->ssl_ctx = NULL;
 944
 945         return -1;
 946 }
 947
 948 static int ast_rtp_dtls_active(struct ast_rtp_instance *instance)
 949 {
 950         struct ast_rtp *rtp = ast_rtp_instance_get_data(instance);
 951
 952         return !rtp->ssl_ctx ? 0 : 1;
 953 }
 954
 955 static void ast_rtp_dtls_stop(struct ast_rtp_instance *instance)
 956 {
 957         struct ast_rtp *rtp = ast_rtp_instance_get_data(instance);
 958
 959         if (rtp->ssl_ctx) {
 960                 SSL_CTX_free(rtp->ssl_ctx);
 961                 rtp->ssl_ctx = NULL;
 962         }
 963
 964         if (rtp->ssl) {
 965                 SSL_free(rtp->ssl);
 966                 rtp->ssl = NULL;
 967         }
 968 }
 969
 970 static void ast_rtp_dtls_reset(struct ast_rtp_instance *instance)
 971 {
 972         struct ast_rtp *rtp = ast_rtp_instance_get_data(instance);
 973
 974         /* If the SSL session is not yet finalized don't bother resetting */
 975         if (!SSL_is_init_finished(rtp->ssl)) {
 976                 return;
 977         }
 978
 979         SSL_shutdown(rtp->ssl);
 980         rtp->connection = AST_RTP_DTLS_CONNECTION_NEW;
 981 }
 982
 983 static enum ast_rtp_dtls_connection ast_rtp_dtls_get_connection(struct ast_rtp_instance *instance)
 984 {
 985         struct ast_rtp *rtp = ast_rtp_instance_get_data(instance);
 986
 987         return rtp->connection;
 988 }
 989
 990 static enum ast_rtp_dtls_setup ast_rtp_dtls_get_setup(struct ast_rtp_instance *instance)
 991 {
 992         struct ast_rtp *rtp = ast_rtp_instance_get_data(instance);
 993
 994         return rtp->dtls_setup;
 995 }
 996
 997 static void ast_rtp_dtls_set_setup(struct ast_rtp_instance *instance, enum ast_rtp_dtls_setup setup)
 998 {
 999         struct ast_rtp *rtp = ast_rtp_instance_get_data(instance);
1000         enum ast_rtp_dtls_setup old = rtp->dtls_setup;
1001
1002         switch (setup) {
1003         case AST_RTP_DTLS_SETUP_ACTIVE:
1004                 rtp->dtls_setup = AST_RTP_DTLS_SETUP_PASSIVE;
1005                 break;
1006         case AST_RTP_DTLS_SETUP_PASSIVE:
1007                 rtp->dtls_setup = AST_RTP_DTLS_SETUP_ACTIVE;
1008                 break;
1009         case AST_RTP_DTLS_SETUP_ACTPASS:
1010                 /* We can't respond to an actpass setup with actpass ourselves... so respond with active, as we can initiate connections */
1011                 if (rtp->dtls_setup == AST_RTP_DTLS_SETUP_ACTPASS) {
1012                         rtp->dtls_setup = AST_RTP_DTLS_SETUP_ACTIVE;
1013                 }
1014                 break;
1015         case AST_RTP_DTLS_SETUP_HOLDCONN:
1016                 rtp->dtls_setup = AST_RTP_DTLS_SETUP_HOLDCONN;
1017                 break;
1018         default:
1019                 /* This should never occur... if it does exit early as we don't know what state things are in */
1020                 return;
1021         }
1022
1023         /* If the setup state did not change we go on as if nothing happened */
1024         if (old == rtp->dtls_setup) {
1025                 return;
1026         }
1027
1028         /* If they don't want us to establish a connection wait until later */
1029         if (rtp->dtls_setup == AST_RTP_DTLS_SETUP_HOLDCONN) {
1030                 return;
1031         }
1032
1033         if (rtp->dtls_setup == AST_RTP_DTLS_SETUP_ACTIVE) {
1034                 SSL_set_connect_state(rtp->ssl);
1035         } else if (rtp->dtls_setup == AST_RTP_DTLS_SETUP_PASSIVE) {
1036                 SSL_set_accept_state(rtp->ssl);
1037         } else {
1038                 return;
1039         }
1040 }
1041
1042 static void ast_rtp_dtls_set_fingerprint(struct ast_rtp_instance *instance, enum ast_rtp_dtls_hash hash, const char *fingerprint)
1043 {
1044         char *tmp = ast_strdupa(fingerprint), *value;
1045         int pos = 0;
1046         struct ast_rtp *rtp = ast_rtp_instance_get_data(instance);
1047
1048         if (hash != AST_RTP_DTLS_HASH_SHA1) {
1049                 return;
1050         }
1051
1052         while ((value = strsep(&tmp, ":")) && (pos != (EVP_MAX_MD_SIZE - 1))) {
1053                 sscanf(value, "%02x", (unsigned int*)&rtp->remote_fingerprint[pos++]);
1054         }
1055 }
1056
1057 static const char *ast_rtp_dtls_get_fingerprint(struct ast_rtp_instance *instance, enum ast_rtp_dtls_hash hash)
1058 {
1059         struct ast_rtp *rtp = ast_rtp_instance_get_data(instance);
1060
1061         if (hash != AST_RTP_DTLS_HASH_SHA1) {
1062                 return NULL;
1063         }
1064
1065         return rtp->local_fingerprint;
1066 }
1067
1068 /* DTLS RTP Engine interface declaration */
1069 static struct ast_rtp_engine_dtls ast_rtp_dtls = {
1070         .set_configuration = ast_rtp_dtls_set_configuration,
1071         .active = ast_rtp_dtls_active,
1072         .stop = ast_rtp_dtls_stop,
1073         .reset = ast_rtp_dtls_reset,
1074         .get_connection = ast_rtp_dtls_get_connection,
1075         .get_setup = ast_rtp_dtls_get_setup,
1076         .set_setup = ast_rtp_dtls_set_setup,
1077         .set_fingerprint = ast_rtp_dtls_set_fingerprint,
1078         .get_fingerprint = ast_rtp_dtls_get_fingerprint,
1079 };
1080
1081 #endif
1082
1083 /* RTP Engine Declaration */
1084 static struct ast_rtp_engine asterisk_rtp_engine = {
1085         .name = "asterisk",
1086         .new = ast_rtp_new,
1087         .destroy = ast_rtp_destroy,
1088         .dtmf_begin = ast_rtp_dtmf_begin,
1089         .dtmf_end = ast_rtp_dtmf_end,
1090         .dtmf_end_with_duration = ast_rtp_dtmf_end_with_duration,
1091         .dtmf_mode_set = ast_rtp_dtmf_mode_set,
1092         .dtmf_mode_get = ast_rtp_dtmf_mode_get,
1093         .update_source = ast_rtp_update_source,
1094         .change_source = ast_rtp_change_source,
1095         .write = ast_rtp_write,
1096         .read = ast_rtp_read,
1097         .prop_set = ast_rtp_prop_set,
1098         .fd = ast_rtp_fd,
1099         .remote_address_set = ast_rtp_remote_address_set,
1100         .red_init = rtp_red_init,
1101         .red_buffer = rtp_red_buffer,
1102         .local_bridge = ast_rtp_local_bridge,
1103         .get_stat = ast_rtp_get_stat,
1104         .dtmf_compatible = ast_rtp_dtmf_compatible,
1105         .stun_request = ast_rtp_stun_request,
1106         .stop = ast_rtp_stop,
1107         .qos = ast_rtp_qos_set,
1108         .sendcng = ast_rtp_sendcng,
1109 #ifdef HAVE_PJPROJECT
1110         .ice = &ast_rtp_ice,
1111 #endif
1112 #ifdef HAVE_OPENSSL_SRTP
1113         .dtls = &ast_rtp_dtls,
1114         .activate = ast_rtp_activate,
1115 #endif
1116 };
1117
1118 #ifdef HAVE_PJPROJECT
1119 static void rtp_learning_seq_init(struct rtp_learning_info *info, uint16_t seq);
1120
1121 static void ast_rtp_on_ice_complete(pj_ice_sess *ice, pj_status_t status)
1122 {
1123         struct ast_rtp *rtp = ice->user_data;
1124
1125         if (!strictrtp) {
1126                 return;
1127         }
1128
1129         rtp->strict_rtp_state = STRICT_RTP_LEARN;
1130         rtp_learning_seq_init(&rtp->rtp_source_learn, (uint16_t)rtp->seqno);
1131 }
1132
1133 static void ast_rtp_on_ice_rx_data(pj_ice_sess *ice, unsigned comp_id, unsigned transport_id, void *pkt, pj_size_t size, const pj_sockaddr_t *src_addr, unsigned src_addr_len)
1134 {
1135         struct ast_rtp *rtp = ice->user_data;
1136
1137         /* Instead of handling the packet here (which really doesn't work with our architecture) we set a bit to indicate that it should be handled after pj_ice_sess_on_rx_pkt
1138          * returns */
1139         rtp->passthrough = 1;
1140 }
1141
1142 static pj_status_t ast_rtp_on_ice_tx_pkt(pj_ice_sess *ice, unsigned comp_id, unsigned transport_id, const void *pkt, pj_size_t size, const pj_sockaddr_t *dst_addr, unsigned dst_addr_len)
1143 {
1144         struct ast_rtp *rtp = ice->user_data;
1145         pj_status_t status = PJ_EINVALIDOP;
1146         pj_ssize_t _size = (pj_ssize_t)size;
1147
1148         if (transport_id == TRANSPORT_SOCKET_RTP) {
1149                 /* Traffic is destined to go right out the RTP socket we already have */
1150                 status = pj_sock_sendto(rtp->s, pkt, &_size, 0, dst_addr, dst_addr_len);
1151                 /* sendto on a connectionless socket should send all the data, or none at all */
1152                 ast_assert(_size == size || status != PJ_SUCCESS);
1153         } else if (transport_id == TRANSPORT_SOCKET_RTCP) {
1154                 /* Traffic is destined to go right out the RTCP socket we already have */
1155                 if (rtp->rtcp) {
1156                         status = pj_sock_sendto(rtp->rtcp->s, pkt, &_size, 0, dst_addr, dst_addr_len);
1157                         /* sendto on a connectionless socket should send all the data, or none at all */
1158                         ast_assert(_size == size || status != PJ_SUCCESS);
1159                 } else {
1160                         status = PJ_SUCCESS;
1161                 }
1162         } else if (transport_id == TRANSPORT_TURN_RTP) {
1163                 /* Traffic is going through the RTP TURN relay */
1164                 if (rtp->turn_rtp) {
1165                         status = pj_turn_sock_sendto(rtp->turn_rtp, pkt, size, dst_addr, dst_addr_len);
1166                 }
1167         } else if (transport_id == TRANSPORT_TURN_RTCP) {
1168                 /* Traffic is going through the RTCP TURN relay */
1169                 if (rtp->turn_rtcp) {
1170                         status = pj_turn_sock_sendto(rtp->turn_rtcp, pkt, size, dst_addr, dst_addr_len);
1171                 }
1172         }
1173
1174         return status;
1175 }
1176
1177 /* ICE Session interface declaration */
1178 static pj_ice_sess_cb ast_rtp_ice_sess_cb = {
1179         .on_ice_complete = ast_rtp_on_ice_complete,
1180         .on_rx_data = ast_rtp_on_ice_rx_data,
1181         .on_tx_pkt = ast_rtp_on_ice_tx_pkt,
1182 };
1183
1184 static void ast_rtp_on_turn_rx_rtp_data(pj_turn_sock *turn_sock, void *pkt, unsigned pkt_len, const pj_sockaddr_t *peer_addr, unsigned addr_len)
1185 {
1186         struct ast_rtp_instance *instance = pj_turn_sock_get_user_data(turn_sock);
1187         struct ast_rtp *rtp = ast_rtp_instance_get_data(instance);
1188         struct ast_sockaddr dest = { { 0, }, };
1189
1190         ast_rtp_instance_get_local_address(instance, &dest);
1191
1192         ast_sendto(rtp->s, pkt, pkt_len, 0, &dest);
1193 }
1194
1195 static void ast_rtp_on_turn_rtp_state(pj_turn_sock *turn_sock, pj_turn_state_t old_state, pj_turn_state_t new_state)
1196 {
1197         struct ast_rtp_instance *instance = pj_turn_sock_get_user_data(turn_sock);
1198         struct ast_rtp *rtp = NULL;
1199
1200         /* If this is a leftover from an already destroyed RTP instance just ignore the state change */
1201         if (!instance) {
1202                 return;
1203         }
1204
1205         rtp = ast_rtp_instance_get_data(instance);
1206
1207         /* If the TURN session is being destroyed we need to remove it from the RTP instance */
1208         if (new_state == PJ_TURN_STATE_DESTROYING) {
1209                 rtp->turn_rtp = NULL;
1210                 return;
1211         }
1212
1213         /* We store the new state so the other thread can actually handle it */
1214         ast_mutex_lock(&rtp->lock);
1215         rtp->turn_state = new_state;
1216
1217         /* If this is a state that the main thread should be notified about do so */
1218         if (new_state == PJ_TURN_STATE_READY || new_state == PJ_TURN_STATE_DEALLOCATING || new_state == PJ_TURN_STATE_DEALLOCATED) {
1219                 ast_cond_signal(&rtp->cond);
1220         }
1221
1222         ast_mutex_unlock(&rtp->lock);
1223 }
1224
1225 /* RTP TURN Socket interface declaration */
1226 static pj_turn_sock_cb ast_rtp_turn_rtp_sock_cb = {
1227         .on_rx_data = ast_rtp_on_turn_rx_rtp_data,
1228         .on_state = ast_rtp_on_turn_rtp_state,
1229 };
1230
1231 static void ast_rtp_on_turn_rx_rtcp_data(pj_turn_sock *turn_sock, void *pkt, unsigned pkt_len, const pj_sockaddr_t *peer_addr, unsigned addr_len)
1232 {
1233         struct ast_rtp_instance *instance = pj_turn_sock_get_user_data(turn_sock);
1234         struct ast_rtp *rtp = ast_rtp_instance_get_data(instance);
1235
1236         ast_sendto(rtp->rtcp->s, pkt, pkt_len, 0, &rtp->rtcp->us);
1237 }
1238
1239 static void ast_rtp_on_turn_rtcp_state(pj_turn_sock *turn_sock, pj_turn_state_t old_state, pj_turn_state_t new_state)
1240 {
1241         struct ast_rtp_instance *instance = pj_turn_sock_get_user_data(turn_sock);
1242         struct ast_rtp *rtp = NULL;
1243
1244         /* If this is a leftover from an already destroyed RTP instance just ignore the state change */
1245         if (!instance) {
1246                 return;
1247         }
1248
1249         rtp = ast_rtp_instance_get_data(instance);
1250
1251         /* If the TURN session is being destroyed we need to remove it from the RTP instance */
1252         if (new_state == PJ_TURN_STATE_DESTROYING) {
1253                 rtp->turn_rtcp = NULL;
1254                 return;
1255         }
1256
1257         /* We store the new state so the other thread can actually handle it */
1258         ast_mutex_lock(&rtp->lock);
1259         rtp->turn_state = new_state;
1260
1261         /* If this is a state that the main thread should be notified about do so */
1262         if (new_state == PJ_TURN_STATE_READY || new_state == PJ_TURN_STATE_DEALLOCATING || new_state == PJ_TURN_STATE_DEALLOCATED) {
1263                 ast_cond_signal(&rtp->cond);
1264         }
1265
1266        ast_mutex_unlock(&rtp->lock);
1267 }
1268
1269 /* RTCP TURN Socket interface declaration */
1270 static pj_turn_sock_cb ast_rtp_turn_rtcp_sock_cb = {
1271         .on_rx_data = ast_rtp_on_turn_rx_rtcp_data,
1272         .on_state = ast_rtp_on_turn_rtcp_state,
1273 };
1274
1275 /*! \brief Worker thread for I/O queue and timerheap */
1276 static int ice_worker_thread(void *data)
1277 {
1278         while (!worker_terminate) {
1279                 const pj_time_val delay = {0, 10};
1280
1281                 pj_ioqueue_poll(ioqueue, &delay);
1282
1283                 pj_timer_heap_poll(timerheap, NULL);
1284         }
1285
1286         return 0;
1287 }
1288 #endif
1289
1290 static inline int rtp_debug_test_addr(struct ast_sockaddr *addr)
1291 {
1292         if (!rtpdebug) {
1293                 return 0;
1294         }
1295         if (!ast_sockaddr_isnull(&rtpdebugaddr)) {
1296                 if (rtpdebugport) {
1297                         return (ast_sockaddr_cmp(&rtpdebugaddr, addr) == 0); /* look for RTP packets from IP+Port */
1298                 } else {
1299                         return (ast_sockaddr_cmp_addr(&rtpdebugaddr, addr) == 0); /* only look for RTP packets from IP */
1300                 }
1301         }
1302
1303         return 1;
1304 }
1305
1306 static inline int rtcp_debug_test_addr(struct ast_sockaddr *addr)
1307 {
1308         if (!rtcpdebug) {
1309                 return 0;
1310         }
1311         if (!ast_sockaddr_isnull(&rtcpdebugaddr)) {
1312                 if (rtcpdebugport) {
1313                         return (ast_sockaddr_cmp(&rtcpdebugaddr, addr) == 0); /* look for RTCP packets from IP+Port */
1314                 } else {
1315                         return (ast_sockaddr_cmp_addr(&rtcpdebugaddr, addr) == 0); /* only look for RTCP packets from IP */
1316                 }
1317         }
1318
1319         return 1;
1320 }
1321
1322 #ifdef HAVE_OPENSSL_SRTP
1323 static void dtls_srtp_check_pending(struct ast_rtp_instance *instance, struct ast_rtp *rtp)
1324 {
1325         size_t pending = BIO_ctrl_pending(rtp->write_bio);
1326
1327         if (pending > 0) {
1328                 char outgoing[pending];
1329                 size_t out;
1330                 struct ast_sockaddr remote_address = { {0, } };
1331                 int ice;
1332
1333                 ast_rtp_instance_get_remote_address(instance, &remote_address);
1334
1335                 /* If we do not yet know an address to send this to defer it until we do */
1336                 if (ast_sockaddr_isnull(&remote_address)) {
1337                         return;
1338                 }
1339
1340                 out = BIO_read(rtp->write_bio, outgoing, sizeof(outgoing));
1341
1342                 __rtp_sendto(instance, outgoing, out, 0, &remote_address, 0, &ice, 0);
1343         }
1344 }
1345
1346 static int dtls_srtp_renegotiate(const void *data)
1347 {
1348         struct ast_rtp_instance *instance = (struct ast_rtp_instance *)data;
1349         struct ast_rtp *rtp = ast_rtp_instance_get_data(instance);
1350
1351         SSL_renegotiate(rtp->ssl);
1352         SSL_do_handshake(rtp->ssl);
1353         dtls_srtp_check_pending(instance, rtp);
1354
1355         rtp->rekeyid = -1;
1356         ao2_ref(instance, -1);
1357
1358         return 0;
1359 }
1360
1361 static int dtls_srtp_setup(struct ast_rtp *rtp, struct ast_srtp *srtp, struct ast_rtp_instance *instance)
1362 {
1363         unsigned char material[SRTP_MASTER_LEN * 2];
1364         unsigned char *local_key, *local_salt, *remote_key, *remote_salt;
1365         struct ast_srtp_policy *local_policy, *remote_policy = NULL;
1366         struct ast_rtp_instance_stats stats = { 0, };
1367
1368         /* If a fingerprint is present in the SDP make sure that the peer certificate matches it */
1369         if (SSL_CTX_get_verify_mode(rtp->ssl_ctx) != SSL_VERIFY_NONE) {
1370                 X509 *certificate;
1371
1372                 if (!(certificate = SSL_get_peer_certificate(rtp->ssl))) {
1373                         ast_log(LOG_WARNING, "No certificate was provided by the peer on RTP instance '%p'\n", instance);
1374                         return -1;
1375                 }
1376
1377                 /* If a fingerprint is present in the SDP make sure that the peer certificate matches it */
1378                 if (rtp->remote_fingerprint[0]) {
1379                         unsigned char fingerprint[EVP_MAX_MD_SIZE];
1380                         unsigned int size;
1381
1382                         if (!X509_digest(certificate, EVP_sha1(), fingerprint, &size) ||
1383                             !size ||
1384                             memcmp(fingerprint, rtp->remote_fingerprint, size)) {
1385                                 X509_free(certificate);
1386                                 ast_log(LOG_WARNING, "Fingerprint provided by remote party does not match that of peer certificate on RTP instance '%p'\n",
1387                                         instance);
1388                                 return -1;
1389                         }
1390                 }
1391
1392                 X509_free(certificate);
1393         }
1394
1395         /* Ensure that certificate verification was successful */
1396         if (SSL_get_verify_result(rtp->ssl) != X509_V_OK) {
1397                 ast_log(LOG_WARNING, "Peer certificate on RTP instance '%p' failed verification test\n",
1398                         instance);
1399                 return -1;
1400         }
1401
1402         /* Produce key information and set up SRTP */
1403         if (!SSL_export_keying_material(rtp->ssl, material, SRTP_MASTER_LEN * 2, "EXTRACTOR-dtls_srtp", 19, NULL, 0, 0)) {
1404                 ast_log(LOG_WARNING, "Unable to extract SRTP keying material from DTLS-SRTP negotiation on RTP instance '%p'\n",
1405                         instance);
1406                 return -1;
1407         }
1408
1409         /* Whether we are acting as a server or client determines where the keys/salts are */
1410         if (rtp->dtls_setup == AST_RTP_DTLS_SETUP_ACTIVE) {
1411                 local_key = material;
1412                 remote_key = local_key + SRTP_MASTER_KEY_LEN;
1413                 local_salt = remote_key + SRTP_MASTER_KEY_LEN;
1414                 remote_salt = local_salt + SRTP_MASTER_SALT_LEN;
1415         } else {
1416                 remote_key = material;
1417                 local_key = remote_key + SRTP_MASTER_KEY_LEN;
1418                 remote_salt = local_key + SRTP_MASTER_KEY_LEN;
1419                 local_salt = remote_salt + SRTP_MASTER_SALT_LEN;
1420         }
1421
1422         if (!(local_policy = res_srtp_policy->alloc())) {
1423                 return -1;
1424         }
1425
1426         if (res_srtp_policy->set_master_key(local_policy, local_key, SRTP_MASTER_KEY_LEN, local_salt, SRTP_MASTER_SALT_LEN) < 0) {
1427                 ast_log(LOG_WARNING, "Could not set key/salt information on local policy of '%p' when setting up DTLS-SRTP\n", rtp);
1428                 goto error;
1429         }
1430
1431         if (res_srtp_policy->set_suite(local_policy, rtp->suite)) {
1432                 ast_log(LOG_WARNING, "Could not set suite to '%d' on local policy of '%p' when setting up DTLS-SRTP\n", rtp->suite, rtp);
1433                 goto error;
1434         }
1435
1436         if (ast_rtp_instance_get_stats(instance, &stats, AST_RTP_INSTANCE_STAT_LOCAL_SSRC)) {
1437                 goto error;
1438         }
1439
1440         res_srtp_policy->set_ssrc(local_policy, stats.local_ssrc, 0);
1441
1442         if (!(remote_policy = res_srtp_policy->alloc())) {
1443                 goto error;
1444         }
1445
1446         if (res_srtp_policy->set_master_key(remote_policy, remote_key, SRTP_MASTER_KEY_LEN, remote_salt, SRTP_MASTER_SALT_LEN) < 0) {
1447                 ast_log(LOG_WARNING, "Could not set key/salt information on remote policy of '%p' when setting up DTLS-SRTP\n", rtp);
1448                 goto error;
1449         }
1450
1451         if (res_srtp_policy->set_suite(remote_policy, rtp->suite)) {
1452                 ast_log(LOG_WARNING, "Could not set suite to '%d' on remote policy of '%p' when setting up DTLS-SRTP\n", rtp->suite, rtp);
1453                 goto error;
1454         }
1455
1456         res_srtp_policy->set_ssrc(remote_policy, 0, 1);
1457
1458         if (ast_rtp_instance_add_srtp_policy(instance, remote_policy, local_policy)) {
1459                 ast_log(LOG_WARNING, "Could not set policies when setting up DTLS-SRTP on '%p'\n", rtp);
1460                 goto error;
1461         }
1462
1463         if (rtp->rekey) {
1464                 ao2_ref(instance, +1);
1465                 if ((rtp->rekeyid = ast_sched_add(rtp->sched, rtp->rekey * 1000, dtls_srtp_renegotiate, instance)) < 0) {
1466                         ao2_ref(instance, -1);
1467                         goto error;
1468                 }
1469         }
1470
1471         return 0;
1472
1473 error:
1474         res_srtp_policy->destroy(local_policy);
1475
1476         if (remote_policy) {
1477                 res_srtp_policy->destroy(remote_policy);
1478         }
1479
1480         return -1;
1481 }
1482 #endif
1483
1484 static int __rtp_recvfrom(struct ast_rtp_instance *instance, void *buf, size_t size, int flags, struct ast_sockaddr *sa, int rtcp)
1485 {
1486         int len;
1487         struct ast_rtp *rtp = ast_rtp_instance_get_data(instance);
1488         struct ast_srtp *srtp = ast_rtp_instance_get_srtp(instance);
1489         char *in = buf;
1490
1491         if ((len = ast_recvfrom(rtcp ? rtp->rtcp->s : rtp->s, buf, size, flags, sa)) < 0) {
1492            return len;
1493         }
1494
1495 #ifdef HAVE_OPENSSL_SRTP
1496         if (!rtcp) {
1497                 dtls_srtp_check_pending(instance, rtp);
1498
1499                 /* If this is an SSL packet pass it to OpenSSL for processing */
1500                 if ((*in >= 20) && (*in <= 64)) {
1501                         int res = 0;
1502
1503                         /* If no SSL session actually exists terminate things */
1504                         if (!rtp->ssl) {
1505                                 ast_log(LOG_ERROR, "Received SSL traffic on RTP instance '%p' without an SSL session\n",
1506                                         instance);
1507                                 return -1;
1508                         }
1509
1510                         /* If we don't yet know if we are active or passive and we receive a packet... we are obviously passive */
1511                         if (rtp->dtls_setup == AST_RTP_DTLS_SETUP_ACTPASS) {
1512                                 rtp->dtls_setup = AST_RTP_DTLS_SETUP_PASSIVE;
1513                                 SSL_set_accept_state(rtp->ssl);
1514                         }
1515
1516                         dtls_srtp_check_pending(instance, rtp);
1517
1518                         BIO_write(rtp->read_bio, buf, len);
1519
1520                         len = SSL_read(rtp->ssl, buf, len);
1521
1522                         dtls_srtp_check_pending(instance, rtp);
1523
1524                         if (rtp->dtls_failure) {
1525                                 ast_log(LOG_ERROR, "DTLS failure occurred on RTP instance '%p', terminating\n",
1526                                         instance);
1527                                 return -1;
1528                         }
1529
1530                         if (SSL_is_init_finished(rtp->ssl)) {
1531                                 /* Any further connections will be existing since this is now established */
1532                                 rtp->connection = AST_RTP_DTLS_CONNECTION_EXISTING;
1533
1534                                 /* Use the keying material to set up key/salt information */
1535                                 res = dtls_srtp_setup(rtp, srtp, instance);
1536                         }
1537
1538                         return res;
1539                 }
1540         }
1541 #endif
1542
1543 #ifdef HAVE_PJPROJECT
1544         if (rtp->ice) {
1545                 pj_str_t combined = pj_str(ast_sockaddr_stringify(sa));
1546                 pj_sockaddr address;
1547                 pj_status_t status;
1548
1549                 pj_thread_register_check();
1550
1551                 pj_sockaddr_parse(pj_AF_UNSPEC(), 0, &combined, &address);
1552
1553                 status = pj_ice_sess_on_rx_pkt(rtp->ice, rtcp ? AST_RTP_ICE_COMPONENT_RTCP : AST_RTP_ICE_COMPONENT_RTP,
1554                         rtcp ? TRANSPORT_SOCKET_RTCP : TRANSPORT_SOCKET_RTP, buf, len, &address,
1555                         pj_sockaddr_get_len(&address));
1556                 if (status != PJ_SUCCESS) {
1557                         char buf[100];
1558
1559                         pj_strerror(status, buf, sizeof(buf));
1560                         ast_log(LOG_WARNING, "PJ ICE Rx error status code: %d '%s'.\n",
1561                                 (int) status, buf);
1562                         return -1;
1563                 }
1564                 if (!rtp->passthrough) {
1565                         return 0;
1566                 }
1567                 rtp->passthrough = 0;
1568         }
1569 #endif
1570
1571         if ((*in & 0xC0) && res_srtp && srtp && res_srtp->unprotect(srtp, buf, &len, rtcp) < 0) {
1572            return -1;
1573         }
1574
1575         return len;
1576 }
1577
1578 static int rtcp_recvfrom(struct ast_rtp_instance *instance, void *buf, size_t size, int flags, struct ast_sockaddr *sa)
1579 {
1580         return __rtp_recvfrom(instance, buf, size, flags, sa, 1);
1581 }
1582
1583 static int rtp_recvfrom(struct ast_rtp_instance *instance, void *buf, size_t size, int flags, struct ast_sockaddr *sa)
1584 {
1585         return __rtp_recvfrom(instance, buf, size, flags, sa, 0);
1586 }
1587
1588 static int __rtp_sendto(struct ast_rtp_instance *instance, void *buf, size_t size, int flags, struct ast_sockaddr *sa, int rtcp, int *ice, int use_srtp)
1589 {
1590         int len = size;
1591         void *temp = buf;
1592         struct ast_rtp *rtp = ast_rtp_instance_get_data(instance);
1593         struct ast_srtp *srtp = ast_rtp_instance_get_srtp(instance);
1594
1595         *ice = 0;
1596
1597         if (use_srtp && res_srtp && srtp && res_srtp->protect(srtp, &temp, &len, rtcp) < 0) {
1598                 return -1;
1599         }
1600
1601 #ifdef HAVE_PJPROJECT
1602         if (rtp->ice) {
1603                 pj_thread_register_check();
1604
1605                 if (pj_ice_sess_send_data(rtp->ice, rtcp ? AST_RTP_ICE_COMPONENT_RTCP : AST_RTP_ICE_COMPONENT_RTP, temp, len) == PJ_SUCCESS) {
1606                         *ice = 1;
1607                         return 0;
1608                 }
1609         }
1610 #endif
1611
1612         return ast_sendto(rtcp ? rtp->rtcp->s : rtp->s, temp, len, flags, sa);
1613 }
1614
1615 static int rtcp_sendto(struct ast_rtp_instance *instance, void *buf, size_t size, int flags, struct ast_sockaddr *sa, int *ice)
1616 {
1617         return __rtp_sendto(instance, buf, size, flags, sa, 1, ice, 1);
1618 }
1619
1620 static int rtp_sendto(struct ast_rtp_instance *instance, void *buf, size_t size, int flags, struct ast_sockaddr *sa, int *ice)
1621 {
1622         return __rtp_sendto(instance, buf, size, flags, sa, 0, ice, 1);
1623 }
1624
1625 static int rtp_get_rate(struct ast_format *format)
1626 {
1627         return (format->id == AST_FORMAT_G722) ? 8000 : ast_format_rate(format);
1628 }
1629
1630 static unsigned int ast_rtcp_calc_interval(struct ast_rtp *rtp)
1631 {
1632         unsigned int interval;
1633         /*! \todo XXX Do a more reasonable calculation on this one
1634          * Look in RFC 3550 Section A.7 for an example*/
1635         interval = rtcpinterval;
1636         return interval;
1637 }
1638
1639 /*! \brief Calculate normal deviation */
1640 static double normdev_compute(double normdev, double sample, unsigned int sample_count)
1641 {
1642         normdev = normdev * sample_count + sample;
1643         sample_count++;
1644
1645         return normdev / sample_count;
1646 }
1647
1648 static double stddev_compute(double stddev, double sample, double normdev, double normdev_curent, unsigned int sample_count)
1649 {
1650 /*
1651                 for the formula check http://www.cs.umd.edu/~austinjp/constSD.pdf
1652                 return sqrt( (sample_count*pow(stddev,2) + sample_count*pow((sample-normdev)/(sample_count+1),2) + pow(sample-normdev_curent,2)) / (sample_count+1));
1653                 we can compute the sigma^2 and that way we would have to do the sqrt only 1 time at the end and would save another pow 2 compute
1654                 optimized formula
1655 */
1656 #define SQUARE(x) ((x) * (x))
1657
1658         stddev = sample_count * stddev;
1659         sample_count++;
1660
1661         return stddev +
1662                 ( sample_count * SQUARE( (sample - normdev) / sample_count ) ) +
1663                 ( SQUARE(sample - normdev_curent) / sample_count );
1664
1665 #undef SQUARE
1666 }
1667
1668 static int create_new_socket(const char *type, int af)
1669 {
1670         int sock = socket(af, SOCK_DGRAM, 0);
1671
1672         if (sock < 0) {
1673                 if (!type) {
1674                         type = "RTP/RTCP";
1675                 }
1676                 ast_log(LOG_WARNING, "Unable to allocate %s socket: %s\n", type, strerror(errno));
1677         } else {
1678                 long flags = fcntl(sock, F_GETFL);
1679                 fcntl(sock, F_SETFL, flags | O_NONBLOCK);
1680 #ifdef SO_NO_CHECK
1681                 if (nochecksums) {
1682                         setsockopt(sock, SOL_SOCKET, SO_NO_CHECK, &nochecksums, sizeof(nochecksums));
1683                 }
1684 #endif
1685         }
1686
1687         return sock;
1688 }
1689
1690 /*!
1691  * \internal
1692  * \brief Initializes sequence values and probation for learning mode.
1693  * \note This is an adaptation of pjmedia's pjmedia_rtp_seq_init function.
1694  *
1695  * \param info The learning information to track
1696  * \param seq sequence number read from the rtp header to initialize the information with
1697  */
1698 static void rtp_learning_seq_init(struct rtp_learning_info *info, uint16_t seq)
1699 {
1700         info->max_seq = seq - 1;
1701         info->packets = learning_min_sequential;
1702 }
1703
1704 /*!
1705  * \internal
1706  * \brief Updates sequence information for learning mode and determines if probation/learning mode should remain in effect.
1707  * \note This function was adapted from pjmedia's pjmedia_rtp_seq_update function.
1708  *
1709  * \param info Structure tracking the learning progress of some address
1710  * \param seq sequence number read from the rtp header
1711  * \retval 0 if probation mode should exit for this address
1712  * \retval non-zero if probation mode should continue
1713  */
1714 static int rtp_learning_rtp_seq_update(struct rtp_learning_info *info, uint16_t seq)
1715 {
1716         if (seq == info->max_seq + 1) {
1717                 /* packet is in sequence */
1718                 info->packets--;
1719         } else {
1720                 /* Sequence discontinuity; reset */
1721                 info->packets = learning_min_sequential - 1;
1722         }
1723         info->max_seq = seq;
1724
1725         return (info->packets == 0);
1726 }
1727
1728 #ifdef HAVE_PJPROJECT
1729 static void rtp_add_candidates_to_ice(struct ast_rtp_instance *instance, struct ast_rtp *rtp, struct ast_sockaddr *addr, int port, int component,
1730                                       int transport, const pj_turn_sock_cb *turn_cb, pj_turn_sock **turn_sock)
1731 {
1732         pj_sockaddr address[16];
1733         unsigned int count = PJ_ARRAY_SIZE(address), pos = 0;
1734
1735         /* Add all the local interface IP addresses */
1736         if (ast_sockaddr_is_ipv4(addr)) {
1737                 pj_enum_ip_interface(pj_AF_INET(), &count, address);
1738         } else if (ast_sockaddr_is_any(addr)) {
1739                 pj_enum_ip_interface(pj_AF_UNSPEC(), &count, address);
1740         } else {
1741                 pj_enum_ip_interface(pj_AF_INET6(), &count, address);
1742         }
1743
1744         for (pos = 0; pos < count; pos++) {
1745                 pj_sockaddr_set_port(&address[pos], port);
1746                 ast_rtp_ice_add_cand(rtp, component, transport, PJ_ICE_CAND_TYPE_HOST, 65535, &address[pos], &address[pos], NULL,
1747                                      pj_sockaddr_get_len(&address[pos]));
1748         }
1749
1750         /* If configured to use a STUN server to get our external mapped address do so */
1751         if (stunaddr.sin_addr.s_addr && ast_sockaddr_is_ipv4(addr) && count) {
1752                 struct sockaddr_in answer;
1753
1754                 if (!ast_stun_request(component == AST_RTP_ICE_COMPONENT_RTCP ? rtp->rtcp->s : rtp->s, &stunaddr, NULL, &answer)) {
1755                         pj_sockaddr base;
1756                         pj_str_t mapped = pj_str(ast_strdupa(ast_inet_ntoa(answer.sin_addr)));
1757
1758                         /* Use the first local host candidate as the base */
1759                         pj_sockaddr_cp(&base, &address[0]);
1760
1761                         pj_sockaddr_init(pj_AF_INET(), &address[0], &mapped, ntohs(answer.sin_port));
1762
1763                         ast_rtp_ice_add_cand(rtp, component, transport, PJ_ICE_CAND_TYPE_SRFLX, 65535, &address[0], &base,
1764                                              NULL, pj_sockaddr_get_len(&address[0]));
1765                 }
1766         }
1767
1768         /* If configured to use a TURN relay create a session and allocate */
1769         if (pj_strlen(&turnaddr) && pj_turn_sock_create(&rtp->ice->stun_cfg, ast_sockaddr_is_ipv4(addr) ? pj_AF_INET() : pj_AF_INET6(), PJ_TURN_TP_TCP,
1770                                                         turn_cb, NULL, instance, turn_sock) == PJ_SUCCESS) {
1771                 pj_stun_auth_cred cred = { 0, };
1772                 struct timeval wait = ast_tvadd(ast_tvnow(), ast_samp2tv(TURN_ALLOCATION_WAIT_TIME, 1000));
1773                 struct timespec ts = { .tv_sec = wait.tv_sec, .tv_nsec = wait.tv_usec * 1000, };
1774
1775                 cred.type = PJ_STUN_AUTH_CRED_STATIC;
1776                 cred.data.static_cred.username = turnusername;
1777                 cred.data.static_cred.data_type = PJ_STUN_PASSWD_PLAIN;
1778                 cred.data.static_cred.data = turnpassword;
1779
1780                 /* Because the TURN socket is asynchronous but we are synchronous we need to wait until it is done */
1781                 ast_mutex_lock(&rtp->lock);
1782                 pj_turn_sock_alloc(*turn_sock, &turnaddr, turnport, NULL, &cred, NULL);
1783                 ast_cond_timedwait(&rtp->cond, &rtp->lock, &ts);
1784                 ast_mutex_unlock(&rtp->lock);
1785
1786                 /* If a TURN session was allocated add it as a candidate */
1787                 if (rtp->turn_state == PJ_TURN_STATE_READY) {
1788                         pj_turn_session_info info;
1789
1790                         pj_turn_sock_get_info(*turn_sock, &info);
1791
1792                         if (transport == TRANSPORT_SOCKET_RTP) {
1793                                 transport = TRANSPORT_TURN_RTP;
1794                         } else if (transport == TRANSPORT_SOCKET_RTCP) {
1795                                 transport = TRANSPORT_TURN_RTCP;
1796                         }
1797
1798                         ast_rtp_ice_add_cand(rtp, component, transport, PJ_ICE_CAND_TYPE_RELAYED, 65535, &info.relay_addr, &info.relay_addr,
1799                                              NULL, pj_sockaddr_get_len(&info.relay_addr));
1800                 }
1801         }
1802 }
1803 #endif
1804
1805 /*!
1806  * \internal
1807  * \brief Calculates the elapsed time from issue of the first tx packet in an
1808  *        rtp session and a specified time
1809  *
1810  * \param rtp pointer to the rtp struct with the transmitted rtp packet
1811  * \param delivery time of delivery - if NULL or zero value, will be ast_tvnow()
1812  *
1813  * \return time elapsed in milliseconds
1814  */
1815 static unsigned int calc_txstamp(struct ast_rtp *rtp, struct timeval *delivery)
1816 {
1817         struct timeval t;
1818         long ms;
1819
1820         if (ast_tvzero(rtp->txcore)) {
1821                 rtp->txcore = ast_tvnow();
1822                 rtp->txcore.tv_usec -= rtp->txcore.tv_usec % 20000;
1823         }
1824
1825         t = (delivery && !ast_tvzero(*delivery)) ? *delivery : ast_tvnow();
1826         if ((ms = ast_tvdiff_ms(t, rtp->txcore)) < 0) {
1827                 ms = 0;
1828         }
1829         rtp->txcore = t;
1830
1831         return (unsigned int) ms;
1832 }
1833
1834 #ifdef HAVE_PJPROJECT
1835 /*!
1836  * \internal
1837  * \brief Creates an ICE session. Can be used to replace a destroyed ICE session.
1838  *
1839  * \param instance RTP instance for which the ICE session is being replaced
1840  * \param addr ast_sockaddr to use for adding RTP candidates to the ICE session
1841  * \param port port to use for adding RTP candidates to the ICE session
1842  * \param replace 0 when creating a new session, 1 when replacing a destroyed session
1843  *
1844  * \retval 0 on success
1845  * \retval -1 on failure
1846  */
1847 static int ice_create(struct ast_rtp_instance *instance, struct ast_sockaddr *addr,
1848         int port, int replace)
1849 {
1850         pj_stun_config stun_config;
1851         pj_str_t ufrag, passwd;
1852         struct ast_rtp *rtp = ast_rtp_instance_get_data(instance);
1853
1854         ao2_cleanup(rtp->ice_local_candidates);
1855         rtp->ice_local_candidates = NULL;
1856
1857         pj_thread_register_check();
1858
1859         pj_stun_config_init(&stun_config, &cachingpool.factory, 0, ioqueue, timerheap);
1860
1861         ufrag = pj_str(rtp->local_ufrag);
1862         passwd = pj_str(rtp->local_passwd);
1863
1864         /* Create an ICE session for ICE negotiation */
1865         if (pj_ice_sess_create(&stun_config, NULL, PJ_ICE_SESS_ROLE_UNKNOWN, 2,
1866                         &ast_rtp_ice_sess_cb, &ufrag, &passwd, NULL, &rtp->ice) == PJ_SUCCESS) {
1867                 /* Make this available for the callbacks */
1868                 rtp->ice->user_data = rtp;
1869
1870                 /* Add all of the available candidates to the ICE session */
1871                 rtp_add_candidates_to_ice(instance, rtp, addr, port, AST_RTP_ICE_COMPONENT_RTP,
1872                         TRANSPORT_SOCKET_RTP, &ast_rtp_turn_rtp_sock_cb, &rtp->turn_rtp);
1873
1874                 /* Only add the RTCP candidates to ICE when replacing the session. New sessions
1875                  * handle this in a separate part of the setup phase */
1876                 if (replace && rtp->rtcp) {
1877                         rtp_add_candidates_to_ice(instance, rtp, &rtp->rtcp->us,
1878                                 ast_sockaddr_port(&rtp->rtcp->us), AST_RTP_ICE_COMPONENT_RTCP,
1879                                 TRANSPORT_SOCKET_RTCP, &ast_rtp_turn_rtcp_sock_cb, &rtp->turn_rtcp);
1880                 }
1881
1882                 return 0;
1883         }
1884
1885         return -1;
1886
1887 }
1888 #endif
1889
1890 static int ast_rtp_new(struct ast_rtp_instance *instance,
1891                        struct ast_sched_context *sched, struct ast_sockaddr *addr,
1892                        void *data)
1893 {
1894         struct ast_rtp *rtp = NULL;
1895         int x, startplace;
1896
1897         /* Create a new RTP structure to hold all of our data */
1898         if (!(rtp = ast_calloc(1, sizeof(*rtp)))) {
1899                 return -1;
1900         }
1901
1902         /* Initialize synchronization aspects */
1903         ast_mutex_init(&rtp->lock);
1904         ast_cond_init(&rtp->cond, NULL);
1905
1906         /* Set default parameters on the newly created RTP structure */
1907         rtp->ssrc = ast_random();
1908         rtp->seqno = ast_random() & 0xffff;
1909         rtp->strict_rtp_state = (strictrtp ? STRICT_RTP_LEARN : STRICT_RTP_OPEN);
1910         if (strictrtp) {
1911                 rtp_learning_seq_init(&rtp->rtp_source_learn, (uint16_t)rtp->seqno);
1912                 rtp_learning_seq_init(&rtp->alt_source_learn, (uint16_t)rtp->seqno);
1913         }
1914
1915         /* Create a new socket for us to listen on and use */
1916         if ((rtp->s =
1917              create_new_socket("RTP",
1918                                ast_sockaddr_is_ipv4(addr) ? AF_INET  :
1919                                ast_sockaddr_is_ipv6(addr) ? AF_INET6 : -1)) < 0) {
1920                 ast_debug(1, "Failed to create a new socket for RTP instance '%p'\n", instance);
1921                 ast_free(rtp);
1922                 return -1;
1923         }
1924
1925         /* Now actually find a free RTP port to use */
1926         x = (rtpend == rtpstart) ? rtpstart : (ast_random() % (rtpend - rtpstart)) + rtpstart;
1927         x = x & ~1;
1928         startplace = x;
1929
1930         for (;;) {
1931                 ast_sockaddr_set_port(addr, x);
1932                 /* Try to bind, this will tell us whether the port is available or not */
1933                 if (!ast_bind(rtp->s, addr)) {
1934                         ast_debug(1, "Allocated port %d for RTP instance '%p'\n", x, instance);
1935                         ast_rtp_instance_set_local_address(instance, addr);
1936                         break;
1937                 }
1938
1939                 x += 2;
1940                 if (x > rtpend) {
1941                         x = (rtpstart + 1) & ~1;
1942                 }
1943
1944                 /* See if we ran out of ports or if the bind actually failed because of something other than the address being in use */
1945                 if (x == startplace || (errno != EADDRINUSE && errno != EACCES)) {
1946                         ast_log(LOG_ERROR, "Oh dear... we couldn't allocate a port for RTP instance '%p'\n", instance);
1947                         close(rtp->s);
1948                         ast_free(rtp);
1949                         return -1;
1950                 }
1951         }
1952
1953 #ifdef HAVE_PJPROJECT
1954         generate_random_string(rtp->local_ufrag, sizeof(rtp->local_ufrag));
1955         generate_random_string(rtp->local_passwd, sizeof(rtp->local_passwd));
1956 #endif
1957         ast_rtp_instance_set_data(instance, rtp);
1958 #ifdef HAVE_PJPROJECT
1959         /* Create an ICE session for ICE negotiation */
1960         if (icesupport) {
1961                 if (ice_create(instance, addr, x, 0)) {
1962                         ast_log(LOG_NOTICE, "Failed to start ICE session\n");
1963                 } else {
1964                         rtp->ice_port = x;
1965                         ast_sockaddr_copy(&rtp->ice_original_rtp_addr, addr);
1966                 }
1967         }
1968 #endif
1969
1970         /* Record any information we may need */
1971         rtp->sched = sched;
1972
1973 #ifdef HAVE_OPENSSL_SRTP
1974         rtp->rekeyid = -1;
1975 #endif
1976
1977         return 0;
1978 }
1979
1980 static int ast_rtp_destroy(struct ast_rtp_instance *instance)
1981 {
1982         struct ast_rtp *rtp = ast_rtp_instance_get_data(instance);
1983
1984         /* Destroy the smoother that was smoothing out audio if present */
1985         if (rtp->smoother) {
1986                 ast_smoother_free(rtp->smoother);
1987         }
1988
1989         /* Close our own socket so we no longer get packets */
1990         if (rtp->s > -1) {
1991                 close(rtp->s);
1992         }
1993
1994         /* Destroy RTCP if it was being used */
1995         if (rtp->rtcp) {
1996                 /*
1997                  * It is not possible for there to be an active RTCP scheduler
1998                  * entry at this point since it holds a reference to the
1999                  * RTP instance while it's active.
2000                  */
2001                 close(rtp->rtcp->s);
2002                 ast_free(rtp->rtcp);
2003         }
2004
2005         /* Destroy RED if it was being used */
2006         if (rtp->red) {
2007                 AST_SCHED_DEL(rtp->sched, rtp->red->schedid);
2008                 ast_free(rtp->red);
2009         }
2010
2011 #ifdef HAVE_PJPROJECT
2012         pj_thread_register_check();
2013
2014         /* Destroy the ICE session if being used */
2015         if (rtp->ice) {
2016                 pj_ice_sess_destroy(rtp->ice);
2017         }
2018
2019         /* Destroy the RTP TURN relay if being used */
2020         if (rtp->turn_rtp) {
2021                 pj_turn_sock_set_user_data(rtp->turn_rtp, NULL);
2022                 pj_turn_sock_destroy(rtp->turn_rtp);
2023         }
2024
2025         /* Destroy the RTCP TURN relay if being used */
2026         if (rtp->turn_rtcp) {
2027                 pj_turn_sock_set_user_data(rtp->turn_rtcp, NULL);
2028                 pj_turn_sock_destroy(rtp->turn_rtcp);
2029         }
2030
2031         /* Destroy any candidates */
2032         if (rtp->ice_local_candidates) {
2033                 ao2_ref(rtp->ice_local_candidates, -1);
2034         }
2035
2036         if (rtp->ice_active_remote_candidates) {
2037                 ao2_ref(rtp->ice_active_remote_candidates, -1);
2038         }
2039 #endif
2040
2041 #ifdef HAVE_OPENSSL_SRTP
2042         /* Destroy the SSL context if present */
2043         if (rtp->ssl_ctx) {
2044                 SSL_CTX_free(rtp->ssl_ctx);
2045         }
2046
2047         /* Destroy the SSL session if present */
2048         if (rtp->ssl) {
2049                 SSL_free(rtp->ssl);
2050         }
2051 #endif
2052
2053         /* Destroy synchronization items */
2054         ast_mutex_destroy(&rtp->lock);
2055         ast_cond_destroy(&rtp->cond);
2056
2057         /* Finally destroy ourselves */
2058         ast_free(rtp);
2059
2060         return 0;
2061 }
2062
2063 static int ast_rtp_dtmf_mode_set(struct ast_rtp_instance *instance, enum ast_rtp_dtmf_mode dtmf_mode)
2064 {
2065         struct ast_rtp *rtp = ast_rtp_instance_get_data(instance);
2066         rtp->dtmfmode = dtmf_mode;
2067         return 0;
2068 }
2069
2070 static enum ast_rtp_dtmf_mode ast_rtp_dtmf_mode_get(struct ast_rtp_instance *instance)
2071 {
2072         struct ast_rtp *rtp = ast_rtp_instance_get_data(instance);
2073         return rtp->dtmfmode;
2074 }
2075
2076 static int ast_rtp_dtmf_begin(struct ast_rtp_instance *instance, char digit)
2077 {
2078         struct ast_rtp *rtp = ast_rtp_instance_get_data(instance);
2079         struct ast_sockaddr remote_address = { {0,} };
2080         int hdrlen = 12, res = 0, i = 0, payload = 101;
2081         char data[256];
2082         unsigned int *rtpheader = (unsigned int*)data;
2083
2084         ast_rtp_instance_get_remote_address(instance, &remote_address);
2085
2086         /* If we have no remote address information bail out now */
2087         if (ast_sockaddr_isnull(&remote_address)) {
2088                 return -1;
2089         }
2090
2091         /* Convert given digit into what we want to transmit */
2092         if ((digit <= '9') && (digit >= '0')) {
2093                 digit -= '0';
2094         } else if (digit == '*') {
2095                 digit = 10;
2096         } else if (digit == '#') {
2097                 digit = 11;
2098         } else if ((digit >= 'A') && (digit <= 'D')) {
2099                 digit = digit - 'A' + 12;
2100         } else if ((digit >= 'a') && (digit <= 'd')) {
2101                 digit = digit - 'a' + 12;
2102         } else {
2103                 ast_log(LOG_WARNING, "Don't know how to represent '%c'\n", digit);
2104                 return -1;
2105         }
2106
2107         /* Grab the payload that they expect the RFC2833 packet to be received in */
2108         payload = ast_rtp_codecs_payload_code(ast_rtp_instance_get_codecs(instance), 0, NULL, AST_RTP_DTMF);
2109
2110         rtp->dtmfmute = ast_tvadd(ast_tvnow(), ast_tv(0, 500000));
2111         rtp->send_duration = 160;
2112         rtp->lastts += calc_txstamp(rtp, NULL) * DTMF_SAMPLE_RATE_MS;
2113         rtp->lastdigitts = rtp->lastts + rtp->send_duration;
2114
2115         /* Create the actual packet that we will be sending */
2116         rtpheader[0] = htonl((2 << 30) | (1 << 23) | (payload << 16) | (rtp->seqno));
2117         rtpheader[1] = htonl(rtp->lastdigitts);
2118         rtpheader[2] = htonl(rtp->ssrc);
2119
2120         /* Actually send the packet */
2121         for (i = 0; i < 2; i++) {
2122                 int ice;
2123
2124                 rtpheader[3] = htonl((digit << 24) | (0xa << 16) | (rtp->send_duration));
2125                 res = rtp_sendto(instance, (void *) rtpheader, hdrlen + 4, 0, &remote_address, &ice);
2126                 if (res < 0) {
2127                         ast_log(LOG_ERROR, "RTP Transmission error to %s: %s\n",
2128                                 ast_sockaddr_stringify(&remote_address),
2129                                 strerror(errno));
2130                 }
2131                 update_address_with_ice_candidate(rtp, AST_RTP_ICE_COMPONENT_RTP, &remote_address);
2132                 if (rtp_debug_test_addr(&remote_address)) {
2133                         ast_verbose("Sent RTP DTMF packet to %s%s (type %-2.2d, seq %-6.6u, ts %-6.6u, len %-6.6u)\n",
2134                                     ast_sockaddr_stringify(&remote_address),
2135                                     ice ? " (via ICE)" : "",
2136                                     payload, rtp->seqno, rtp->lastdigitts, res - hdrlen);
2137                 }
2138                 rtp->seqno++;
2139                 rtp->send_duration += 160;
2140                 rtpheader[0] = htonl((2 << 30) | (payload << 16) | (rtp->seqno));
2141         }
2142
2143         /* Record that we are in the process of sending a digit and information needed to continue doing so */
2144         rtp->sending_digit = 1;
2145         rtp->send_digit = digit;
2146         rtp->send_payload = payload;
2147
2148         return 0;
2149 }
2150
2151 static int ast_rtp_dtmf_continuation(struct ast_rtp_instance *instance)
2152 {
2153         struct ast_rtp *rtp = ast_rtp_instance_get_data(instance);
2154         struct ast_sockaddr remote_address = { {0,} };
2155         int hdrlen = 12, res = 0;
2156         char data[256];
2157         unsigned int *rtpheader = (unsigned int*)data;
2158         int ice;
2159
2160         ast_rtp_instance_get_remote_address(instance, &remote_address);
2161
2162         /* Make sure we know where the other side is so we can send them the packet */
2163         if (ast_sockaddr_isnull(&remote_address)) {
2164                 return -1;
2165         }
2166
2167         /* Actually create the packet we will be sending */
2168         rtpheader[0] = htonl((2 << 30) | (rtp->send_payload << 16) | (rtp->seqno));
2169         rtpheader[1] = htonl(rtp->lastdigitts);
2170         rtpheader[2] = htonl(rtp->ssrc);
2171         rtpheader[3] = htonl((rtp->send_digit << 24) | (0xa << 16) | (rtp->send_duration));
2172
2173         /* Boom, send it on out */
2174         res = rtp_sendto(instance, (void *) rtpheader, hdrlen + 4, 0, &remote_address, &ice);
2175         if (res < 0) {
2176                 ast_log(LOG_ERROR, "RTP Transmission error to %s: %s\n",
2177                         ast_sockaddr_stringify(&remote_address),
2178                         strerror(errno));
2179         }
2180
2181         update_address_with_ice_candidate(rtp, AST_RTP_ICE_COMPONENT_RTP, &remote_address);
2182
2183         if (rtp_debug_test_addr(&remote_address)) {
2184                 ast_verbose("Sent RTP DTMF packet to %s%s (type %-2.2d, seq %-6.6u, ts %-6.6u, len %-6.6u)\n",
2185                             ast_sockaddr_stringify(&remote_address),
2186                             ice ? " (via ICE)" : "",
2187                             rtp->send_payload, rtp->seqno, rtp->lastdigitts, res - hdrlen);
2188         }
2189
2190         /* And now we increment some values for the next time we swing by */
2191         rtp->seqno++;
2192         rtp->send_duration += 160;
2193         rtp->lastts += calc_txstamp(rtp, NULL) * DTMF_SAMPLE_RATE_MS;
2194
2195         return 0;
2196 }
2197
2198 static int ast_rtp_dtmf_end_with_duration(struct ast_rtp_instance *instance, char digit, unsigned int duration)
2199 {
2200         struct ast_rtp *rtp = ast_rtp_instance_get_data(instance);
2201         struct ast_sockaddr remote_address = { {0,} };
2202         int hdrlen = 12, res = -1, i = 0;
2203         char data[256];
2204         unsigned int *rtpheader = (unsigned int*)data;
2205         unsigned int measured_samples;
2206
2207         ast_rtp_instance_get_remote_address(instance, &remote_address);
2208
2209         /* Make sure we know where the remote side is so we can send them the packet we construct */
2210         if (ast_sockaddr_isnull(&remote_address)) {
2211                 goto cleanup;
2212         }
2213
2214         /* Convert the given digit to the one we are going to send */
2215         if ((digit <= '9') && (digit >= '0')) {
2216                 digit -= '0';
2217         } else if (digit == '*') {
2218                 digit = 10;
2219         } else if (digit == '#') {
2220                 digit = 11;
2221         } else if ((digit >= 'A') && (digit <= 'D')) {
2222                 digit = digit - 'A' + 12;
2223         } else if ((digit >= 'a') && (digit <= 'd')) {
2224                 digit = digit - 'a' + 12;
2225         } else {
2226                 ast_log(LOG_WARNING, "Don't know how to represent '%c'\n", digit);
2227                 goto cleanup;
2228         }
2229
2230         rtp->dtmfmute = ast_tvadd(ast_tvnow(), ast_tv(0, 500000));
2231
2232         if (duration > 0 && (measured_samples = duration * rtp_get_rate(&rtp->f.subclass.format) / 1000) > rtp->send_duration) {
2233                 ast_debug(2, "Adjusting final end duration from %u to %u\n", rtp->send_duration, measured_samples);
2234                 rtp->send_duration = measured_samples;
2235         }
2236
2237         /* Construct the packet we are going to send */
2238         rtpheader[1] = htonl(rtp->lastdigitts);
2239         rtpheader[2] = htonl(rtp->ssrc);
2240         rtpheader[3] = htonl((digit << 24) | (0xa << 16) | (rtp->send_duration));
2241         rtpheader[3] |= htonl((1 << 23));
2242
2243         /* Send it 3 times, that's the magical number */
2244         for (i = 0; i < 3; i++) {
2245                 int ice;
2246
2247                 rtpheader[0] = htonl((2 << 30) | (rtp->send_payload << 16) | (rtp->seqno));
2248
2249                 res = rtp_sendto(instance, (void *) rtpheader, hdrlen + 4, 0, &remote_address, &ice);
2250
2251                 if (res < 0) {
2252                         ast_log(LOG_ERROR, "RTP Transmission error to %s: %s\n",
2253                                 ast_sockaddr_stringify(&remote_address),
2254                                 strerror(errno));
2255                 }
2256
2257                 update_address_with_ice_candidate(rtp, AST_RTP_ICE_COMPONENT_RTP, &remote_address);
2258
2259                 if (rtp_debug_test_addr(&remote_address)) {
2260                         ast_verbose("Sent RTP DTMF packet to %s%s (type %-2.2d, seq %-6.6u, ts %-6.6u, len %-6.6u)\n",
2261                                     ast_sockaddr_stringify(&remote_address),
2262                                     ice ? " (via ICE)" : "",
2263                                     rtp->send_payload, rtp->seqno, rtp->lastdigitts, res - hdrlen);
2264                 }
2265
2266                 rtp->seqno++;
2267         }
2268         res = 0;
2269
2270         /* Oh and we can't forget to turn off the stuff that says we are sending DTMF */
2271         rtp->lastts += calc_txstamp(rtp, NULL) * DTMF_SAMPLE_RATE_MS;
2272 cleanup:
2273         rtp->sending_digit = 0;
2274         rtp->send_digit = 0;
2275
2276         return res;
2277 }
2278
2279 static int ast_rtp_dtmf_end(struct ast_rtp_instance *instance, char digit)
2280 {
2281         return ast_rtp_dtmf_end_with_duration(instance, digit, 0);
2282 }
2283
2284 static void ast_rtp_update_source(struct ast_rtp_instance *instance)
2285 {
2286         struct ast_rtp *rtp = ast_rtp_instance_get_data(instance);
2287
2288         /* We simply set this bit so that the next packet sent will have the marker bit turned on */
2289         ast_set_flag(rtp, FLAG_NEED_MARKER_BIT);
2290         ast_debug(3, "Setting the marker bit due to a source update\n");
2291
2292         return;
2293 }
2294
2295 static void ast_rtp_change_source(struct ast_rtp_instance *instance)
2296 {
2297         struct ast_rtp *rtp = ast_rtp_instance_get_data(instance);
2298         struct ast_srtp *srtp = ast_rtp_instance_get_srtp(instance);
2299         unsigned int ssrc = ast_random();
2300
2301         if (!rtp->lastts) {
2302                 ast_debug(3, "Not changing SSRC since we haven't sent any RTP yet\n");
2303                 return;
2304         }
2305
2306         /* We simply set this bit so that the next packet sent will have the marker bit turned on */
2307         ast_set_flag(rtp, FLAG_NEED_MARKER_BIT);
2308
2309         ast_debug(3, "Changing ssrc from %u to %u due to a source change\n", rtp->ssrc, ssrc);
2310
2311         if (srtp) {
2312                 ast_debug(3, "Changing ssrc for SRTP from %u to %u\n", rtp->ssrc, ssrc);
2313                 res_srtp->change_source(srtp, rtp->ssrc, ssrc);
2314         }
2315
2316         rtp->ssrc = ssrc;
2317
2318         return;
2319 }
2320
2321 static void timeval2ntp(struct timeval tv, unsigned int *msw, unsigned int *lsw)
2322 {
2323         unsigned int sec, usec, frac;
2324         sec = tv.tv_sec + 2208988800u; /* Sec between 1900 and 1970 */
2325         usec = tv.tv_usec;
2326         frac = (usec << 12) + (usec << 8) - ((usec * 3650) >> 6);
2327         *msw = sec;
2328         *lsw = frac;
2329 }
2330
2331 static void ntp2timeval(unsigned int msw, unsigned int lsw, struct timeval *tv)
2332 {
2333         tv->tv_sec = msw - 2208988800u;
2334         tv->tv_usec = ((lsw << 6) / 3650) - (lsw >> 12) - (lsw >> 8);
2335 }
2336
2337 static void calculate_lost_packet_statistics(struct ast_rtp *rtp,
2338                 unsigned int *lost_packets,
2339                 int *fraction_lost)
2340 {
2341         unsigned int extended_seq_no;
2342         unsigned int expected_packets;
2343         unsigned int expected_interval;
2344         unsigned int received_interval;
2345         double rxlost_current;
2346         int lost_interval;
2347
2348         /* Compute statistics */
2349         extended_seq_no = rtp->cycles + rtp->lastrxseqno;
2350         expected_packets = extended_seq_no - rtp->seedrxseqno + 1;
2351         if (rtp->rxcount > expected_packets) {
2352                 expected_packets += rtp->rxcount - expected_packets;
2353         }
2354         *lost_packets = expected_packets - rtp->rxcount;
2355         expected_interval = expected_packets - rtp->rtcp->expected_prior;
2356         received_interval = rtp->rxcount - rtp->rtcp->received_prior;
2357         lost_interval = expected_interval - received_interval;
2358         if (expected_interval == 0 || lost_interval <= 0) {
2359                 *fraction_lost = 0;
2360         } else {
2361                 *fraction_lost = (lost_interval << 8) / expected_interval;
2362         }
2363
2364         /* Update RTCP statistics */
2365         rtp->rtcp->received_prior = rtp->rxcount;
2366         rtp->rtcp->expected_prior = expected_packets;
2367         if (lost_interval <= 0) {
2368                 rtp->rtcp->rxlost = 0;
2369         } else {
2370                 rtp->rtcp->rxlost = lost_interval;
2371         }
2372         if (rtp->rtcp->rxlost_count == 0) {
2373                 rtp->rtcp->minrxlost = rtp->rtcp->rxlost;
2374         }
2375         if (lost_interval < rtp->rtcp->minrxlost) {
2376                 rtp->rtcp->minrxlost = rtp->rtcp->rxlost;
2377         }
2378         if (lost_interval > rtp->rtcp->maxrxlost) {
2379                 rtp->rtcp->maxrxlost = rtp->rtcp->rxlost;
2380         }
2381         rxlost_current = normdev_compute(rtp->rtcp->normdev_rxlost,
2382                         rtp->rtcp->rxlost,
2383                         rtp->rtcp->rxlost_count);
2384         rtp->rtcp->stdev_rxlost = stddev_compute(rtp->rtcp->stdev_rxlost,
2385                         rtp->rtcp->rxlost,
2386                         rtp->rtcp->normdev_rxlost,
2387                         rxlost_current,
2388                         rtp->rtcp->rxlost_count);
2389         rtp->rtcp->normdev_rxlost = rxlost_current;
2390         rtp->rtcp->rxlost_count++;
2391 }
2392
2393 /*! \brief Send RTCP SR or RR report */
2394 static int ast_rtcp_write_report(struct ast_rtp_instance *instance, int sr)
2395 {
2396         struct ast_rtp *rtp = ast_rtp_instance_get_data(instance);
2397         RAII_VAR(struct ast_json *, message_blob, NULL, ast_json_unref);
2398         int res;
2399         int len = 0;
2400         struct timeval now;
2401         unsigned int now_lsw;
2402         unsigned int now_msw;
2403         unsigned int *rtcpheader;
2404         unsigned int lost_packets;
2405         int fraction_lost;
2406         struct timeval dlsr = { 0, };
2407         char bdata[512];
2408         int rate = rtp_get_rate(&rtp->f.subclass.format);
2409         int ice;
2410         int header_offset = 0;
2411         struct ast_sockaddr remote_address = { {0,} };
2412         struct ast_rtp_rtcp_report_block *report_block;
2413         RAII_VAR(struct ast_rtp_rtcp_report *, rtcp_report,
2414                         ast_rtp_rtcp_report_alloc(1),
2415                         ao2_cleanup);
2416
2417         if (!rtp || !rtp->rtcp) {
2418                 return 0;
2419         }
2420
2421         if (ast_sockaddr_isnull(&rtp->rtcp->them)) {  /* This'll stop rtcp for this rtp session */
2422                 /* RTCP was stopped. */
2423                 return 0;
2424         }
2425
2426         if (!rtcp_report) {
2427                 return 1;
2428         }
2429
2430         report_block = ast_calloc(1, sizeof(*report_block));
2431         if (!report_block) {
2432                 return 1;
2433         }
2434
2435         /* Compute statistics */
2436         calculate_lost_packet_statistics(rtp, &lost_packets, &fraction_lost);
2437
2438         gettimeofday(&now, NULL);
2439         rtcp_report->reception_report_count = 1;
2440         rtcp_report->ssrc = rtp->ssrc;
2441         rtcp_report->type = sr ? RTCP_PT_SR : RTCP_PT_RR;
2442         if (sr) {
2443                 rtcp_report->sender_information.ntp_timestamp = now;
2444                 rtcp_report->sender_information.rtp_timestamp = rtp->lastts;
2445                 rtcp_report->sender_information.packet_count = rtp->txcount;
2446                 rtcp_report->sender_information.octet_count = rtp->txoctetcount;
2447         }
2448         rtcp_report->report_block[0] = report_block;
2449         report_block->source_ssrc = rtp->themssrc;
2450         report_block->lost_count.fraction = (fraction_lost & 0xff);
2451         report_block->lost_count.packets = (lost_packets & 0xffffff);
2452         report_block->highest_seq_no = (rtp->cycles | (rtp->lastrxseqno & 0xffff));
2453         report_block->ia_jitter = (unsigned int)(rtp->rxjitter * rate);
2454         report_block->lsr = rtp->rtcp->themrxlsr;
2455         /* If we haven't received an SR report, DLSR should be 0 */
2456         if (!ast_tvzero(rtp->rtcp->rxlsr)) {
2457                 timersub(&now, &rtp->rtcp->rxlsr, &dlsr);
2458                 report_block->dlsr = (((dlsr.tv_sec * 1000) + (dlsr.tv_usec / 1000)) * 65536) / 1000;
2459         }
2460         timeval2ntp(rtcp_report->sender_information.ntp_timestamp, &now_msw, &now_lsw);
2461         rtcpheader = (unsigned int *)bdata;
2462         rtcpheader[1] = htonl(rtcp_report->ssrc);            /* Our SSRC */
2463         len += 8;
2464         if (sr) {
2465                 header_offset = 5;
2466                 rtcpheader[2] = htonl(now_msw);                 /* now, MSW. gettimeofday() + SEC_BETWEEN_1900_AND_1970*/
2467                 rtcpheader[3] = htonl(now_lsw);                 /* now, LSW */
2468                 rtcpheader[4] = htonl(rtcp_report->sender_information.rtp_timestamp);
2469                 rtcpheader[5] = htonl(rtcp_report->sender_information.packet_count);
2470                 rtcpheader[6] = htonl(rtcp_report->sender_information.octet_count);
2471                 len += 20;
2472         }
2473         rtcpheader[2 + header_offset] = htonl(report_block->source_ssrc);     /* Their SSRC */
2474         rtcpheader[3 + header_offset] = htonl((report_block->lost_count.fraction << 24) | report_block->lost_count.packets);
2475         rtcpheader[4 + header_offset] = htonl(report_block->highest_seq_no);
2476         rtcpheader[5 + header_offset] = htonl(report_block->ia_jitter);
2477         rtcpheader[6 + header_offset] = htonl(report_block->lsr);
2478         rtcpheader[7 + header_offset] = htonl(report_block->dlsr);
2479         len += 24;
2480         rtcpheader[0] = htonl((2 << 30) | (1 << 24) | ((sr ? RTCP_PT_SR : RTCP_PT_RR) << 16) | ((len/4)-1));
2481
2482         /* Insert SDES here. Probably should make SDES text equal to mimetypes[code].type (not subtype 'cos */
2483         /* it can change mid call, and SDES can't) */
2484         rtcpheader[len/4]     = htonl((2 << 30) | (1 << 24) | (RTCP_PT_SDES << 16) | 2);
2485         rtcpheader[(len/4)+1] = htonl(rtcp_report->ssrc);
2486         rtcpheader[(len/4)+2] = htonl(0x01 << 24);
2487         len += 12;
2488
2489         ast_sockaddr_copy(&remote_address, &rtp->rtcp->them);
2490         res = rtcp_sendto(instance, (unsigned int *)rtcpheader, len, 0, &remote_address, &ice);
2491         if (res < 0) {
2492                 ast_log(LOG_ERROR, "RTCP %s transmission error to %s, rtcp halted %s\n",
2493                         sr ? "SR" : "RR",
2494                         ast_sockaddr_stringify(&rtp->rtcp->them),
2495                         strerror(errno));
2496                 return 0;
2497         }
2498
2499         /* Update RTCP SR/RR statistics */
2500         if (sr) {
2501                 rtp->rtcp->txlsr = rtcp_report->sender_information.ntp_timestamp;
2502                 rtp->rtcp->sr_count++;
2503                 rtp->rtcp->lastsrtxcount = rtp->txcount;
2504         } else {
2505                 rtp->rtcp->rr_count++;
2506         }
2507
2508         update_address_with_ice_candidate(rtp, AST_RTP_ICE_COMPONENT_RTCP, &remote_address);
2509
2510         if (rtcp_debug_test_addr(&rtp->rtcp->them)) {
2511                 ast_verbose("* Sent RTCP %s to %s%s\n", sr ? "SR" : "RR",
2512                                 ast_sockaddr_stringify(&remote_address), ice ? " (via ICE)" : "");
2513                 ast_verbose("  Our SSRC: %u\n", rtcp_report->ssrc);
2514                 if (sr) {
2515                         ast_verbose("  Sent(NTP): %u.%010u\n",
2516                                 (unsigned int)rtcp_report->sender_information.ntp_timestamp.tv_sec,
2517                                 (unsigned int)rtcp_report->sender_information.ntp_timestamp.tv_usec * 4096);
2518                         ast_verbose("  Sent(RTP): %u\n", rtcp_report->sender_information.rtp_timestamp);
2519                         ast_verbose("  Sent packets: %u\n", rtcp_report->sender_information.packet_count);
2520                         ast_verbose("  Sent octets: %u\n", rtcp_report->sender_information.octet_count);
2521                 }
2522                 ast_verbose("  Report block:\n");
2523                 ast_verbose("    Their SSRC: %u\n", report_block->source_ssrc);
2524                 ast_verbose("    Fraction lost: %u\n", report_block->lost_count.fraction);
2525                 ast_verbose("    Cumulative loss: %u\n", report_block->lost_count.packets);
2526                 ast_verbose("    Highest seq no: %u\n", report_block->highest_seq_no);
2527                 ast_verbose("    IA jitter: %.4f\n", (double)report_block->ia_jitter / rate);
2528                 ast_verbose("    Their last SR: %u\n", report_block->lsr);
2529                 ast_verbose("    DLSR: %4.4f (sec)\n\n", (double)(report_block->dlsr / 65536.0));
2530         }
2531
2532         message_blob = ast_json_pack("{s: s}",
2533                         "to", ast_sockaddr_stringify(&remote_address));
2534         ast_rtp_publish_rtcp_message(instance, ast_rtp_rtcp_sent_type(),
2535                         rtcp_report,
2536                         message_blob);
2537         return res;
2538 }
2539
2540 /*! \brief Write and RTCP packet to the far end
2541  * \note Decide if we are going to send an SR (with Reception Block) or RR
2542  * RR is sent if we have not sent any rtp packets in the previous interval */
2543 static int ast_rtcp_write(const void *data)
2544 {
2545         struct ast_rtp_instance *instance = (struct ast_rtp_instance *) data;
2546         struct ast_rtp *rtp = ast_rtp_instance_get_data(instance);
2547         int res;
2548
2549         if (!rtp || !rtp->rtcp || rtp->rtcp->schedid == -1) {
2550                 ao2_ref(instance, -1);
2551                 return 0;
2552         }
2553
2554         if (rtp->txcount > rtp->rtcp->lastsrtxcount) {
2555                 /* Send an SR */
2556                 res = ast_rtcp_write_report(instance, 1);
2557         } else {
2558                 /* Send an RR */
2559                 res = ast_rtcp_write_report(instance, 0);
2560         }
2561
2562         if (!res) {
2563                 /*
2564                  * Not being rescheduled.
2565                  */
2566                 ao2_ref(instance, -1);
2567                 rtp->rtcp->schedid = -1;
2568         }
2569
2570         return res;
2571 }
2572
2573 static int ast_rtp_raw_write(struct ast_rtp_instance *instance, struct ast_frame *frame, int codec)
2574 {
2575         struct ast_rtp *rtp = ast_rtp_instance_get_data(instance);
2576         int pred, mark = 0;
2577         unsigned int ms = calc_txstamp(rtp, &frame->delivery);
2578         struct ast_sockaddr remote_address = { {0,} };
2579         int rate = rtp_get_rate(&frame->subclass.format) / 1000;
2580
2581         if (frame->subclass.format.id == AST_FORMAT_G722) {
2582                 frame->samples /= 2;
2583         }
2584
2585         if (rtp->sending_digit) {
2586                 return 0;
2587         }
2588
2589         if (frame->frametype == AST_FRAME_VOICE) {
2590                 pred = rtp->lastts + frame->samples;
2591
2592                 /* Re-calculate last TS */
2593                 rtp->lastts = rtp->lastts + ms * rate;
2594                 if (ast_tvzero(frame->delivery)) {
2595                         /* If this isn't an absolute delivery time, Check if it is close to our prediction,
2596                            and if so, go with our prediction */
2597                         if (abs(rtp->lastts - pred) < MAX_TIMESTAMP_SKEW) {
2598                                 rtp->lastts = pred;
2599                         } else {
2600                                 ast_debug(3, "Difference is %d, ms is %d\n", abs(rtp->lastts - pred), ms);
2601                                 mark = 1;
2602                         }
2603                 }
2604         } else if (frame->frametype == AST_FRAME_VIDEO) {
2605                 mark = ast_format_get_video_mark(&frame->subclass.format);
2606                 pred = rtp->lastovidtimestamp + frame->samples;
2607                 /* Re-calculate last TS */
2608                 rtp->lastts = rtp->lastts + ms * 90;
2609                 /* If it's close to our prediction, go for it */
2610                 if (ast_tvzero(frame->delivery)) {
2611                         if (abs(rtp->lastts - pred) < 7200) {
2612                                 rtp->lastts = pred;
2613                                 rtp->lastovidtimestamp += frame->samples;
2614                         } else {
2615                                 ast_debug(3, "Difference is %d, ms is %d (%d), pred/ts/samples %d/%d/%d\n", abs(rtp->lastts - pred), ms, ms * 90, rtp->lastts, pred, frame->samples);
2616                                 rtp->lastovidtimestamp = rtp->lastts;
2617                         }
2618                 }
2619         } else {
2620                 pred = rtp->lastotexttimestamp + frame->samples;
2621                 /* Re-calculate last TS */
2622                 rtp->lastts = rtp->lastts + ms;
2623                 /* If it's close to our prediction, go for it */
2624                 if (ast_tvzero(frame->delivery)) {
2625                         if (abs(rtp->lastts - pred) < 7200) {
2626                                 rtp->lastts = pred;
2627                                 rtp->lastotexttimestamp += frame->samples;
2628                         } else {
2629                                 ast_debug(3, "Difference is %d, ms is %d, pred/ts/samples %d/%d/%d\n", abs(rtp->lastts - pred), ms, rtp->lastts, pred, frame->samples);
2630                                 rtp->lastotexttimestamp = rtp->lastts;
2631                         }
2632                 }
2633         }
2634
2635         /* If we have been explicitly told to set the marker bit then do so */
2636         if (ast_test_flag(rtp, FLAG_NEED_MARKER_BIT)) {
2637                 mark = 1;
2638                 ast_clear_flag(rtp, FLAG_NEED_MARKER_BIT);
2639         }
2640
2641         /* If the timestamp for non-digt packets has moved beyond the timestamp for digits, update the digit timestamp */
2642         if (rtp->lastts > rtp->lastdigitts) {
2643                 rtp->lastdigitts = rtp->lastts;
2644         }
2645
2646         if (ast_test_flag(frame, AST_FRFLAG_HAS_TIMING_INFO)) {
2647                 rtp->lastts = frame->ts * rate;
2648         }
2649
2650         ast_rtp_instance_get_remote_address(instance, &remote_address);
2651
2652         /* If we know the remote address construct a packet and send it out */
2653         if (!ast_sockaddr_isnull(&remote_address)) {
2654                 int hdrlen = 12, res, ice;
2655                 unsigned char *rtpheader = (unsigned char *)(frame->data.ptr - hdrlen);
2656
2657                 put_unaligned_uint32(rtpheader, htonl((2 << 30) | (codec << 16) | (rtp->seqno) | (mark << 23)));
2658                 put_unaligned_uint32(rtpheader + 4, htonl(rtp->lastts));
2659                 put_unaligned_uint32(rtpheader + 8, htonl(rtp->ssrc));
2660
2661                 if ((res = rtp_sendto(instance, (void *)rtpheader, frame->datalen + hdrlen, 0, &remote_address, &ice)) < 0) {
2662                         if (!ast_rtp_instance_get_prop(instance, AST_RTP_PROPERTY_NAT) || (ast_rtp_instance_get_prop(instance, AST_RTP_PROPERTY_NAT) && (ast_test_flag(rtp, FLAG_NAT_ACTIVE) == FLAG_NAT_ACTIVE))) {
2663                                 ast_debug(1, "RTP Transmission error of packet %d to %s: %s\n",
2664                                           rtp->seqno,
2665                                           ast_sockaddr_stringify(&remote_address),
2666                                           strerror(errno));
2667                         } else if (((ast_test_flag(rtp, FLAG_NAT_ACTIVE) == FLAG_NAT_INACTIVE) || rtpdebug) && !ast_test_flag(rtp, FLAG_NAT_INACTIVE_NOWARN)) {
2668                                 /* Only give this error message once if we are not RTP debugging */
2669                                 if (rtpdebug)
2670                                         ast_debug(0, "RTP NAT: Can't write RTP to private address %s, waiting for other end to send audio...\n",
2671                                                   ast_sockaddr_stringify(&remote_address));
2672                                 ast_set_flag(rtp, FLAG_NAT_INACTIVE_NOWARN);
2673                         }
2674                 } else {
2675                         rtp->txcount++;
2676                         rtp->txoctetcount += (res - hdrlen);
2677
2678                         if (rtp->rtcp && rtp->rtcp->schedid < 1) {
2679                                 ast_debug(1, "Starting RTCP transmission on RTP instance '%p'\n", instance);
2680                                 ao2_ref(instance, +1);
2681                                 rtp->rtcp->schedid = ast_sched_add(rtp->sched, ast_rtcp_calc_interval(rtp), ast_rtcp_write, instance);
2682                                 if (rtp->rtcp->schedid < 0) {
2683                                         ao2_ref(instance, -1);
2684                                         ast_log(LOG_WARNING, "scheduling RTCP transmission failed.\n");
2685                                 }
2686                         }
2687                 }
2688
2689                 update_address_with_ice_candidate(rtp, AST_RTP_ICE_COMPONENT_RTP, &remote_address);
2690
2691                 if (rtp_debug_test_addr(&remote_address)) {
2692                         ast_verbose("Sent RTP packet to      %s%s (type %-2.2d, seq %-6.6u, ts %-6.6u, len %-6.6u)\n",
2693                                     ast_sockaddr_stringify(&remote_address),
2694                                     ice ? " (via ICE)" : "",
2695                                     codec, rtp->seqno, rtp->lastts, res - hdrlen);
2696                 }
2697         }
2698
2699         rtp->seqno++;
2700
2701         return 0;
2702 }
2703
2704 static struct ast_frame *red_t140_to_red(struct rtp_red *red) {
2705         unsigned char *data = red->t140red.data.ptr;
2706         int len = 0;
2707         int i;
2708
2709         /* replace most aged generation */
2710         if (red->len[0]) {
2711                 for (i = 1; i < red->num_gen+1; i++)
2712                         len += red->len[i];
2713
2714                 memmove(&data[red->hdrlen], &data[red->hdrlen+red->len[0]], len);
2715         }
2716
2717         /* Store length of each generation and primary data length*/
2718         for (i = 0; i < red->num_gen; i++)
2719                 red->len[i] = red->len[i+1];
2720         red->len[i] = red->t140.datalen;
2721
2722         /* write each generation length in red header */
2723         len = red->hdrlen;
2724         for (i = 0; i < red->num_gen; i++) {
2725                 len += data[i*4+3] = red->len[i];
2726         }
2727
2728         /* add primary data to buffer */
2729         memcpy(&data[len], red->t140.data.ptr, red->t140.datalen);
2730         red->t140red.datalen = len + red->t140.datalen;
2731
2732         /* no primary data and no generations to send */
2733         if (len == red->hdrlen && !red->t140.datalen) {
2734                 return NULL;
2735         }
2736
2737         /* reset t.140 buffer */
2738         red->t140.datalen = 0;
2739
2740         return &red->t140red;
2741 }
2742
2743 static int ast_rtp_write(struct ast_rtp_instance *instance, struct ast_frame *frame)
2744 {
2745         struct ast_rtp *rtp = ast_rtp_instance_get_data(instance);
2746         struct ast_sockaddr remote_address = { {0,} };
2747         struct ast_format subclass;
2748         int codec;
2749
2750         ast_rtp_instance_get_remote_address(instance, &remote_address);
2751
2752         /* If we don't actually know the remote address don't even bother doing anything */
2753         if (ast_sockaddr_isnull(&remote_address)) {
2754                 ast_debug(1, "No remote address on RTP instance '%p' so dropping frame\n", instance);
2755                 return 0;
2756         }
2757
2758         /* VP8: is this a request to send a RTCP FIR? */
2759         if (frame->frametype == AST_FRAME_CONTROL && frame->subclass.integer == AST_CONTROL_VIDUPDATE) {
2760                 struct ast_rtp *rtp = ast_rtp_instance_get_data(instance);
2761                 unsigned int *rtcpheader;
2762                 char bdata[1024];
2763                 int len = 20;
2764                 int ice;
2765                 int res;
2766
2767                 if (!rtp || !rtp->rtcp) {
2768                         return 0;
2769                 }
2770
2771                 if (ast_sockaddr_isnull(&rtp->rtcp->them)) {
2772                         /*
2773                          * RTCP was stopped.
2774                          */
2775                         return 0;
2776                 }
2777
2778                 /* Prepare RTCP FIR (PT=206, FMT=4) */
2779                 rtp->rtcp->firseq++;
2780                 if(rtp->rtcp->firseq == 256) {
2781                         rtp->rtcp->firseq = 0;
2782                 }
2783
2784                 rtcpheader = (unsigned int *)bdata;
2785                 rtcpheader[0] = htonl((2 << 30) | (4 << 24) | (RTCP_PT_PSFB << 16) | ((len/4)-1));
2786                 rtcpheader[1] = htonl(rtp->ssrc);
2787                 rtcpheader[2] = htonl(rtp->themssrc);
2788                 rtcpheader[3] = htonl(rtp->themssrc);   /* FCI: SSRC */
2789                 rtcpheader[4] = htonl(rtp->rtcp->firseq << 24);                 /* FCI: Sequence number */
2790                 res = rtcp_sendto(instance, (unsigned int *)rtcpheader, len, 0, &rtp->rtcp->them, &ice);
2791                 if (res < 0) {
2792                         ast_log(LOG_ERROR, "RTCP FIR transmission error: %s\n", strerror(errno));
2793                 }
2794                 return 0;
2795         }
2796
2797         /* If there is no data length we can't very well send the packet */
2798         if (!frame->datalen) {
2799                 ast_debug(1, "Received frame with no data for RTP instance '%p' so dropping frame\n", instance);
2800                 return 0;
2801         }
2802
2803         /* If the packet is not one our RTP stack supports bail out */
2804         if (frame->frametype != AST_FRAME_VOICE && frame->frametype != AST_FRAME_VIDEO && frame->frametype != AST_FRAME_TEXT) {
2805                 ast_log(LOG_WARNING, "RTP can only send voice, video, and text\n");
2806                 return -1;
2807         }
2808
2809         if (rtp->red) {
2810                 /* return 0; */
2811                 /* no primary data or generations to send */
2812                 if ((frame = red_t140_to_red(rtp->red)) == NULL)
2813                         return 0;
2814         }
2815
2816         /* Grab the subclass and look up the payload we are going to use */
2817         ast_format_copy(&subclass, &frame->subclass.format);
2818         if ((codec = ast_rtp_codecs_payload_code(ast_rtp_instance_get_codecs(instance), 1, &subclass, 0)) < 0) {
2819                 ast_log(LOG_WARNING, "Don't know how to send format %s packets with RTP\n", ast_getformatname(&frame->subclass.format));
2820                 return -1;
2821         }
2822
2823         /* Oh dear, if the format changed we will have to set up a new smoother */
2824         if (ast_format_cmp(&rtp->lasttxformat, &subclass) == AST_FORMAT_CMP_NOT_EQUAL) {
2825                 ast_debug(1, "Ooh, format changed from %s to %s\n", ast_getformatname(&rtp->lasttxformat), ast_getformatname(&subclass));
2826                 rtp->lasttxformat = subclass;
2827                 ast_format_copy(&rtp->lasttxformat, &subclass);
2828                 if (rtp->smoother) {
2829                         ast_smoother_free(rtp->smoother);
2830                         rtp->smoother = NULL;
2831                 }
2832         }
2833
2834         /* If no smoother is present see if we have to set one up */
2835         if (!rtp->smoother) {
2836                 struct ast_format_list fmt = ast_codec_pref_getsize(&ast_rtp_instance_get_codecs(instance)->pref, &subclass);
2837
2838                 switch (subclass.id) {
2839                 case AST_FORMAT_SPEEX:
2840                 case AST_FORMAT_SPEEX16:
2841                 case AST_FORMAT_SPEEX32:
2842                 case AST_FORMAT_SILK:
2843                 case AST_FORMAT_CELT:
2844                 case AST_FORMAT_G723_1:
2845                 case AST_FORMAT_SIREN7:
2846                 case AST_FORMAT_SIREN14:
2847                 case AST_FORMAT_G719:
2848                 /* Opus */
2849                 case AST_FORMAT_OPUS:
2850                         /* these are all frame-based codecs and cannot be safely run through
2851                            a smoother */
2852                         break;
2853                 default:
2854                         if (fmt.inc_ms) {
2855                                 if (!(rtp->smoother = ast_smoother_new((fmt.cur_ms * fmt.fr_len) / fmt.inc_ms))) {
2856                                         ast_log(LOG_WARNING, "Unable to create smoother: format %s ms: %d len: %d\n", ast_getformatname(&subclass), fmt.cur_ms, ((fmt.cur_ms * fmt.fr_len) / fmt.inc_ms));
2857                                         return -1;
2858                                 }
2859                                 if (fmt.flags) {
2860                                         ast_smoother_set_flags(rtp->smoother, fmt.flags);
2861                                 }
2862                                 ast_debug(1, "Created smoother: format: %s ms: %d len: %d\n", ast_getformatname(&subclass), fmt.cur_ms, ((fmt.cur_ms * fmt.fr_len) / fmt.inc_ms));
2863                         }
2864                 }
2865         }
2866
2867         /* Feed audio frames into the actual function that will create a frame and send it */
2868         if (rtp->smoother) {
2869                 struct ast_frame *f;
2870
2871                 if (ast_smoother_test_flag(rtp->smoother, AST_SMOOTHER_FLAG_BE)) {
2872                         ast_smoother_feed_be(rtp->smoother, frame);
2873                 } else {
2874                         ast_smoother_feed(rtp->smoother, frame);
2875                 }
2876
2877                 while ((f = ast_smoother_read(rtp->smoother)) && (f->data.ptr)) {
2878                                 ast_rtp_raw_write(instance, f, codec);
2879                 }
2880         } else {
2881                 int hdrlen = 12;
2882                 struct ast_frame *f = NULL;
2883
2884                 if (frame->offset < hdrlen) {
2885                         f = ast_frdup(frame);
2886                 } else {
2887                         f = frame;
2888                 }
2889                 if (f->data.ptr) {
2890                         ast_rtp_raw_write(instance, f, codec);
2891                 }
2892                 if (f != frame) {
2893                         ast_frfree(f);
2894                 }
2895
2896         }
2897
2898         return 0;
2899 }
2900
2901 static void calc_rxstamp(struct timeval *tv, struct ast_rtp *rtp, unsigned int timestamp, int mark)
2902 {
2903         struct timeval now;
2904         struct timeval tmp;
2905         double transit;
2906         double current_time;
2907         double d;
2908         double dtv;
2909         double prog;
2910         int rate = rtp_get_rate(&rtp->f.subclass.format);
2911
2912         double normdev_rxjitter_current;
2913         if ((!rtp->rxcore.tv_sec && !rtp->rxcore.tv_usec) || mark) {
2914                 gettimeofday(&rtp->rxcore, NULL);
2915                 rtp->drxcore = (double) rtp->rxcore.tv_sec + (double) rtp->rxcore.tv_usec / 1000000;
2916                 /* map timestamp to a real time */
2917                 rtp->seedrxts = timestamp; /* Their RTP timestamp started with this */
2918                 tmp = ast_samp2tv(timestamp, rate);
2919                 rtp->rxcore = ast_tvsub(rtp->rxcore, tmp);
2920                 /* Round to 0.1ms for nice, pretty timestamps */
2921                 rtp->rxcore.tv_usec -= rtp->rxcore.tv_usec % 100;
2922         }
2923
2924         gettimeofday(&now,NULL);
2925         /* rxcore is the mapping between the RTP timestamp and _our_ real time from gettimeofday() */
2926         tmp = ast_samp2tv(timestamp, rate);
2927         *tv = ast_tvadd(rtp->rxcore, tmp);
2928
2929         prog = (double)((timestamp-rtp->seedrxts)/(float)(rate));
2930         dtv = (double)rtp->drxcore + (double)(prog);
2931         current_time = (double)now.tv_sec + (double)now.tv_usec/1000000;
2932         transit = current_time - dtv;
2933         d = transit - rtp->rxtransit;
2934         rtp->rxtransit = transit;
2935         if (d<0) {
2936                 d=-d;
2937         }
2938         rtp->rxjitter += (1./16.) * (d - rtp->rxjitter);
2939         if (rtp->rtcp) {
2940                 if (rtp->rxjitter > rtp->rtcp->maxrxjitter)
2941                         rtp->rtcp->maxrxjitter = rtp->rxjitter;
2942                 if (rtp->rtcp->rxjitter_count == 1)
2943                         rtp->rtcp->minrxjitter = rtp->rxjitter;
2944                 if (rtp->rtcp && rtp->rxjitter < rtp->rtcp->minrxjitter)
2945                         rtp->rtcp->minrxjitter = rtp->rxjitter;
2946
2947                 normdev_rxjitter_current = normdev_compute(rtp->rtcp->normdev_rxjitter,rtp->rxjitter,rtp->rtcp->rxjitter_count);
2948                 rtp->rtcp->stdev_rxjitter = stddev_compute(rtp->rtcp->stdev_rxjitter,rtp->rxjitter,rtp->rtcp->normdev_rxjitter,normdev_rxjitter_current,rtp->rtcp->rxjitter_count);
2949
2950                 rtp->rtcp->normdev_rxjitter = normdev_rxjitter_current;
2951                 rtp->rtcp->rxjitter_count++;
2952         }
2953 }
2954
2955 static struct ast_frame *create_dtmf_frame(struct ast_rtp_instance *instance, enum ast_frame_type type, int compensate)
2956 {
2957         struct ast_rtp *rtp = ast_rtp_instance_get_data(instance);
2958         struct ast_sockaddr remote_address = { {0,} };
2959
2960         ast_rtp_instance_get_remote_address(instance, &remote_address);
2961
2962         if (((compensate && type == AST_FRAME_DTMF_END) || (type == AST_FRAME_DTMF_BEGIN)) && ast_tvcmp(ast_tvnow(), rtp->dtmfmute) < 0) {
2963                 ast_debug(1, "Ignore potential DTMF echo from '%s'\n",
2964                           ast_sockaddr_stringify(&remote_address));
2965                 rtp->resp = 0;
2966                 rtp->dtmfsamples = 0;
2967                 return &ast_null_frame;
2968         }
2969         ast_debug(1, "Creating %s DTMF Frame: %d (%c), at %s\n",
2970                 type == AST_FRAME_DTMF_END ? "END" : "BEGIN",
2971                 rtp->resp, rtp->resp,
2972                 ast_sockaddr_stringify(&remote_address));
2973         if (rtp->resp == 'X') {
2974                 rtp->f.frametype = AST_FRAME_CONTROL;
2975                 rtp->f.subclass.integer = AST_CONTROL_FLASH;
2976         } else {
2977                 rtp->f.frametype = type;
2978                 rtp->f.subclass.integer = rtp->resp;
2979         }
2980         rtp->f.datalen = 0;
2981         rtp->f.samples = 0;
2982         rtp->f.mallocd = 0;
2983         rtp->f.src = "RTP";
2984         AST_LIST_NEXT(&rtp->f, frame_list) = NULL;
2985
2986         return &rtp->f;
2987 }
2988
2989 static void process_dtmf_rfc2833(struct ast_rtp_instance *instance, unsigned char *data, int len, unsigned int seqno, unsigned int timestamp, struct ast_sockaddr *addr, int payloadtype, int mark, struct frame_list *frames)
2990 {
2991         struct ast_rtp *rtp = ast_rtp_instance_get_data(instance);
2992         struct ast_sockaddr remote_address = { {0,} };
2993         unsigned int event, event_end, samples;
2994         char resp = 0;
2995         struct ast_frame *f = NULL;
2996
2997         ast_rtp_instance_get_remote_address(instance, &remote_address);
2998
2999         /* Figure out event, event end, and samples */
3000         event = ntohl(*((unsigned int *)(data)));
3001         event >>= 24;
3002         event_end = ntohl(*((unsigned int *)(data)));
3003         event_end <<= 8;
3004         event_end >>= 24;
3005         samples = ntohl(*((unsigned int *)(data)));
3006         samples &= 0xFFFF;
3007
3008         if (rtp_debug_test_addr(&remote_address)) {
3009                 ast_verbose("Got  RTP RFC2833 from   %s (type %-2.2d, seq %-6.6u, ts %-6.6u, len %-6.6u, mark %d, event %08x, end %d, duration %-5.5d) \n",
3010                             ast_sockaddr_stringify(&remote_address),
3011                             payloadtype, seqno, timestamp, len, (mark?1:0), event, ((event_end & 0x80)?1:0), samples);
3012         }
3013
3014         /* Print out debug if turned on */
3015         if (rtpdebug)
3016                 ast_debug(0, "- RTP 2833 Event: %08x (len = %d)\n", event, len);
3017
3018         /* Figure out what digit was pressed */
3019         if (event < 10) {
3020                 resp = '0' + event;
3021         } else if (event < 11) {
3022                 resp = '*';
3023         } else if (event < 12) {
3024                 resp = '#';
3025         } else if (event < 16) {
3026                 resp = 'A' + (event - 12);
3027         } else if (event < 17) {        /* Event 16: Hook flash */
3028                 resp = 'X';
3029         } else {
3030                 /* Not a supported event */
3031                 ast_debug(1, "Ignoring RTP 2833 Event: %08x. Not a DTMF Digit.\n", event);
3032                 return;
3033         }
3034
3035         if (ast_rtp_instance_get_prop(instance, AST_RTP_PROPERTY_DTMF_COMPENSATE)) {
3036                 if ((rtp->last_end_timestamp != timestamp) || (rtp->resp && rtp->resp != resp)) {
3037                         rtp->resp = resp;
3038                         rtp->dtmf_timeout = 0;
3039                         f = ast_frdup(create_dtmf_frame(instance, AST_FRAME_DTMF_END, ast_rtp_instance_get_prop(instance, AST_RTP_PROPERTY_DTMF_COMPENSATE)));
3040                         f->len = 0;
3041                         rtp->last_end_timestamp = timestamp;
3042                         AST_LIST_INSERT_TAIL(frames, f, frame_list);
3043                 }
3044         } else {
3045                 /*  The duration parameter measures the complete
3046                     duration of the event (from the beginning) - RFC2833.
3047                     Account for the fact that duration is only 16 bits long
3048                     (about 8 seconds at 8000 Hz) and can wrap is digit
3049                     is hold for too long. */
3050                 unsigned int new_duration = rtp->dtmf_duration;
3051                 unsigned int last_duration = new_duration & 0xFFFF;
3052
3053                 if (last_duration > 64000 && samples < last_duration) {
3054                         new_duration += 0xFFFF + 1;
3055                 }
3056                 new_duration = (new_duration & ~0xFFFF) | samples;
3057
3058                 if (event_end & 0x80) {
3059                         /* End event */
3060                         if ((rtp->last_seqno != seqno) && (timestamp > rtp->last_end_timestamp)) {
3061                                 rtp->last_end_timestamp = timestamp;
3062                                 rtp->dtmf_duration = new_duration;
3063                                 rtp->resp = resp;
3064                                 f = ast_frdup(create_dtmf_frame(instance, AST_FRAME_DTMF_END, 0));
3065                                 f->len = ast_tvdiff_ms(ast_samp2tv(rtp->dtmf_duration, rtp_get_rate(&f->subclass.format)), ast_tv(0, 0));
3066                                 rtp->resp = 0;
3067                                 rtp->dtmf_duration = rtp->dtmf_timeout = 0;
3068                                 AST_LIST_INSERT_TAIL(frames, f, frame_list);
3069                         } else if (rtpdebug) {
3070                                 ast_debug(1, "Dropping duplicate or out of order DTMF END frame (seqno: %d, ts %d, digit %c)\n",
3071                                         seqno, timestamp, resp);
3072                         }
3073                 } else {
3074                         /* Begin/continuation */
3075
3076                         /* The second portion of the seqno check is to not mistakenly
3077                          * stop accepting DTMF if the seqno rolls over beyond
3078                          * 65535.
3079                          */
3080                         if ((rtp->last_seqno > seqno && rtp->last_seqno - seqno < 50)
3081                                 || timestamp <= rtp->last_end_timestamp) {
3082                                 /* Out of order frame. Processing this can cause us to
3083                                  * improperly duplicate incoming DTMF, so just drop
3084                                  * this.
3085                                  */
3086                                 if (rtpdebug) {
3087                                         ast_debug(1, "Dropping out of order DTMF frame (seqno %d, ts %d, digit %c)\n",
3088                                                 seqno, timestamp, resp);
3089                                 }
3090                                 return;
3091                         }
3092
3093                         if (rtp->resp && rtp->resp != resp) {
3094                                 /* Another digit already began. End it */
3095                                 f = ast_frdup(create_dtmf_frame(instance, AST_FRAME_DTMF_END, 0));
3096                                 f->len = ast_tvdiff_ms(ast_samp2tv(rtp->dtmf_duration, rtp_get_rate(&f->subclass.format)), ast_tv(0, 0));
3097                                 rtp->resp = 0;
3098                                 rtp->dtmf_duration = rtp->dtmf_timeout = 0;
3099                                 AST_LIST_INSERT_TAIL(frames, f, frame_list);
3100                         }
3101
3102                         if (rtp->resp) {
3103                                 /* Digit continues */
3104                                 rtp->dtmf_duration = new_duration;
3105                         } else {
3106                                 /* New digit began */
3107                                 rtp->resp = resp;
3108                                 f = ast_frdup(create_dtmf_frame(instance, AST_FRAME_DTMF_BEGIN, 0));
3109                                 rtp->dtmf_duration = samples;
3110                                 AST_LIST_INSERT_TAIL(frames, f, frame_list);
3111                         }
3112
3113                         rtp->dtmf_timeout = timestamp + rtp->dtmf_duration + dtmftimeout;
3114                 }
3115
3116                 rtp->last_seqno = seqno;
3117         }
3118
3119         rtp->dtmfsamples = samples;
3120
3121         return;
3122 }
3123
3124 static struct ast_frame *process_dtmf_cisco(struct ast_rtp_instance *instance, unsigned char *data, int len, unsigned int seqno, unsigned int timestamp, struct ast_sockaddr *addr, int payloadtype, int mark)
3125 {
3126         struct ast_rtp *rtp = ast_rtp_instance_get_data(instance);
3127         unsigned int event, flags, power;
3128         char resp = 0;
3129         unsigned char seq;
3130         struct ast_frame *f = NULL;
3131
3132         if (len < 4) {
3133                 return NULL;
3134         }
3135
3136         /*      The format of Cisco RTP DTMF packet looks like next:
3137                 +0                              - sequence number of DTMF RTP packet (begins from 1,
3138                                                   wrapped to 0)
3139                 +1                              - set of flags
3140                 +1 (bit 0)              - flaps by different DTMF digits delimited by audio
3141                                                   or repeated digit without audio???
3142                 +2 (+4,+6,...)  - power level? (rises from 0 to 32 at begin of tone
3143                                                   then falls to 0 at its end)
3144                 +3 (+5,+7,...)  - detected DTMF digit (0..9,*,#,A-D,...)
3145                 Repeated DTMF information (bytes 4/5, 6/7) is history shifted right
3146                 by each new packet and thus provides some redudancy.
3147
3148                 Sample of Cisco RTP DTMF packet is (all data in hex):
3149                         19 07 00 02 12 02 20 02
3150                 showing end of DTMF digit '2'.
3151
3152                 The packets
3153                         27 07 00 02 0A 02 20 02
3154                         28 06 20 02 00 02 0A 02
3155                 shows begin of new digit '2' with very short pause (20 ms) after
3156                 previous digit '2'. Bit +1.0 flips at begin of new digit.
3157
3158                 Cisco RTP DTMF packets comes as replacement of audio RTP packets
3159                 so its uses the same sequencing and timestamping rules as replaced
3160                 audio packets. Repeat interval of DTMF packets is 20 ms and not rely
3161                 on audio framing parameters. Marker bit isn't used within stream of
3162                 DTMFs nor audio stream coming immediately after DTMF stream. Timestamps
3163                 are not sequential at borders between DTMF and audio streams,
3164         */
3165
3166         seq = data[0];
3167         flags = data[1];
3168         power = data[2];
3169         event = data[3] & 0x1f;
3170
3171         if (rtpdebug)
3172                 ast_debug(0, "Cisco DTMF Digit: %02x (len=%d, seq=%d, flags=%02x, power=%d, history count=%d)\n", event, len, seq, flags, power, (len - 4) / 2);
3173         if (event < 10) {
3174                 resp = '0' + event;
3175         } else if (event < 11) {
3176                 resp = '*';
3177         } else if (event < 12) {
3178                 resp = '#';
3179         } else if (event < 16) {
3180                 resp = 'A' + (event - 12);
3181         } else if (event < 17) {
3182                 resp = 'X';
3183         }
3184         if ((!rtp->resp && power) || (rtp->resp && (rtp->resp != resp))) {
3185                 rtp->resp = resp;
3186                 /* Why we should care on DTMF compensation at reception? */
3187                 if (ast_rtp_instance_get_prop(instance, AST_RTP_PROPERTY_DTMF_COMPENSATE)) {
3188                         f = create_dtmf_frame(instance, AST_FRAME_DTMF_BEGIN, 0);
3189                         rtp->dtmfsamples = 0;
3190                 }
3191         } else if ((rtp->resp == resp) && !power) {
3192                 f = create_dtmf_frame(instance, AST_FRAME_DTMF_END, ast_rtp_instance_get_prop(instance, AST_RTP_PROPERTY_DTMF_COMPENSATE));
3193                 f->samples = rtp->dtmfsamples * (rtp->lastrxformat.id ? (rtp_get_rate(&rtp->lastrxformat) / 1000) : 8);
3194                 rtp->resp = 0;
3195         } else if (rtp->resp == resp) {
3196                 rtp->dtmfsamples += 20 * (rtp->lastrxformat.id ? (rtp_get_rate(&rtp->lastrxformat) / 1000) : 8);
3197         }
3198
3199         rtp->dtmf_timeout = 0;
3200
3201         return f;
3202 }
3203
3204 static struct ast_frame *process_cn_rfc3389(struct ast_rtp_instance *instance, unsigned char *data, int len, unsigned int seqno, unsigned int timestamp, struct ast_sockaddr *addr, int payloadtype, int mark)
3205 {
3206         struct ast_rtp *rtp = ast_rtp_instance_get_data(instance);
3207
3208         /* Convert comfort noise into audio with various codecs.  Unfortunately this doesn't
3209            totally help us out becuase we don't have an engine to keep it going and we are not
3210            guaranteed to have it every 20ms or anything */
3211         if (rtpdebug) {
3212                 ast_debug(0, "- RTP 3389 Comfort noise event: Level %d (len = %d)\n", (int) rtp->lastrxformat.id, len);
3213         }
3214
3215         if (ast_test_flag(rtp, FLAG_3389_WARNING)) {
3216                 struct ast_sockaddr remote_address = { {0,} };
3217
3218                 ast_rtp_instance_get_remote_address(instance, &remote_address);
3219
3220                 ast_log(LOG_NOTICE, "Comfort noise support incomplete in Asterisk (RFC 3389). Please turn off on client if possible. Client address: %s\n",
3221                         ast_sockaddr_stringify(&remote_address));
3222                 ast_set_flag(rtp, FLAG_3389_WARNING);
3223         }
3224
3225         /* Must have at least one byte */
3226         if (!len) {
3227                 return NULL;
3228         }
3229         if (len < 24) {
3230                 rtp->f.data.ptr = rtp->rawdata + AST_FRIENDLY_OFFSET;
3231                 rtp->f.datalen = len - 1;
3232                 rtp->f.offset = AST_FRIENDLY_OFFSET;
3233                 memcpy(rtp->f.data.ptr, data + 1, len - 1);
3234         } else {
3235                 rtp->f.data.ptr = NULL;
3236                 rtp->f.offset = 0;
3237                 rtp->f.datalen = 0;
3238         }
3239         rtp->f.frametype = AST_FRAME_CNG;
3240         rtp->f.subclass.integer = data[0] & 0x7f;
3241         rtp->f.samples = 0;
3242         rtp->f.delivery.tv_usec = rtp->f.delivery.tv_sec = 0;
3243
3244         return &rtp->f;
3245 }
3246
3247 static int update_rtt_stats(struct ast_rtp *rtp, unsigned int lsr, unsigned int dlsr)
3248 {
3249         struct timeval now;
3250         struct timeval rtt_tv;
3251         unsigned int msw;
3252         unsigned int lsw;
3253         unsigned int rtt_msw;
3254         unsigned int rtt_lsw;
3255         unsigned int lsr_a;
3256         unsigned int rtt;
3257         double normdevrtt_current;
3258
3259         gettimeofday(&now, NULL);
3260         timeval2ntp(now, &msw, &lsw);
3261
3262         lsr_a = ((msw & 0x0000ffff) << 16) | ((lsw & 0xffff0000) >> 16);
3263         rtt = lsr_a - lsr - dlsr;
3264         rtt_msw = (rtt & 0xffff0000) >> 16;
3265         rtt_lsw = (rtt & 0x0000ffff) << 16;
3266         rtt_tv.tv_sec = rtt_msw;
3267         rtt_tv.tv_usec = ((rtt_lsw << 6) / 3650) - (rtt_lsw >> 12) - (rtt_lsw >> 8);
3268         rtp->rtcp->rtt = (double)rtt_tv.tv_sec + ((double)rtt_tv.tv_usec / 1000000);
3269         if (lsr_a - dlsr < lsr) {
3270                 return 1;
3271         }
3272
3273         rtp->rtcp->accumulated_transit += rtp->rtcp->rtt;
3274         if (rtp->rtcp->rtt_count == 0 || rtp->rtcp->minrtt > rtp->rtcp->rtt) {
3275                 rtp->rtcp->minrtt = rtp->rtcp->rtt;
3276         }
3277         if (rtp->rtcp->maxrtt < rtp->rtcp->rtt) {
3278                 rtp->rtcp->maxrtt = rtp->rtcp->rtt;
3279         }
3280
3281         normdevrtt_current = normdev_compute(rtp->rtcp->normdevrtt,
3282                         rtp->rtcp->rtt,
3283                         rtp->rtcp->rtt_count);
3284         rtp->rtcp->stdevrtt = stddev_compute(rtp->rtcp->stdevrtt,
3285                         rtp->rtcp->rtt,
3286                         rtp->rtcp->normdevrtt,
3287                         normdevrtt_current,
3288                         rtp->rtcp->rtt_count);
3289         rtp->rtcp->normdevrtt = normdevrtt_current;
3290         rtp->rtcp->rtt_count++;
3291
3292         return 0;
3293 }
3294
3295 /*!
3296  * \internal
3297  * \brief Update RTCP interarrival jitter stats
3298  */
3299 static void update_jitter_stats(struct ast_rtp *rtp, unsigned int ia_jitter)
3300 {
3301         double reported_jitter;
3302         double reported_normdev_jitter_current;
3303
3304         rtp->rtcp->reported_jitter = ia_jitter;
3305         reported_jitter = (double) rtp->rtcp->reported_jitter;
3306         if (rtp->rtcp->reported_jitter_count == 0) {
3307                 rtp->rtcp->reported_minjitter = reported_jitter;
3308         }
3309         if (reported_jitter < rtp->rtcp->reported_minjitter) {
3310                 rtp->rtcp->reported_minjitter = reported_jitter;
3311         }
3312         if (reported_jitter > rtp->rtcp->reported_maxjitter) {
3313                 rtp->rtcp->reported_maxjitter = reported_jitter;
3314         }
3315         reported_normdev_jitter_current = normdev_compute(rtp->rtcp->reported_normdev_jitter, reported_jitter, rtp->rtcp->reported_jitter_count);
3316         rtp->rtcp->reported_stdev_jitter = stddev_compute(rtp->rtcp->reported_stdev_jitter, reported_jitter, rtp->rtcp->reported_normdev_jitter, reported_normdev_jitter_current, rtp->rtcp->reported_jitter_count);
3317         rtp->rtcp->reported_normdev_jitter = reported_normdev_jitter_current;
3318 }
3319
3320 /*!
3321  * \internal
3322  * \brief Update RTCP lost packet stats
3323  */
3324 static void update_lost_stats(struct ast_rtp *rtp, unsigned int lost_packets)
3325 {
3326         double reported_lost;
3327         double reported_normdev_lost_current;
3328
3329         rtp->rtcp->reported_lost = lost_packets;
3330         reported_lost = (double)rtp->rtcp->reported_lost;
3331         if (rtp->rtcp->reported_jitter_count == 0) {
3332                 rtp->rtcp->reported_minlost = reported_lost;
3333         }
3334         if (reported_lost < rtp->rtcp->reported_minlost) {
3335                 rtp->rtcp->reported_minlost = reported_lost;
3336         }
3337         if (reported_lost > rtp->rtcp->reported_maxlost) {
3338                 rtp->rtcp->reported_maxlost = reported_lost;
3339         }
3340         reported_normdev_lost_current = normdev_compute(rtp->rtcp->reported_normdev_lost, reported_lost, rtp->rtcp->reported_jitter_count);
3341         rtp->rtcp->reported_stdev_lost = stddev_compute(rtp->rtcp->reported_stdev_lost, reported_lost, rtp->rtcp->reported_normdev_lost, reported_normdev_lost_current, rtp->rtcp->reported_jitter_count);
3342         rtp->rtcp->reported_normdev_lost = reported_normdev_lost_current;
3343 }
3344
3345 static struct ast_frame *ast_rtcp_read(struct ast_rtp_instance *instance)
3346 {
3347         struct ast_rtp *rtp = ast_rtp_instance_get_data(instance);
3348         struct ast_sockaddr addr;
3349         unsigned char rtcpdata[8192 + AST_FRIENDLY_OFFSET];
3350         unsigned int *rtcpheader = (unsigned int *)(rtcpdata + AST_FRIENDLY_OFFSET);
3351         int res, packetwords, position = 0;
3352         int report_counter = 0;
3353         struct ast_rtp_rtcp_report_block *report_block;
3354         struct ast_frame *f = &ast_null_frame;
3355
3356         /* Read in RTCP data from the socket */
3357         if ((res = rtcp_recvfrom(instance, rtcpdata + AST_FRIENDLY_OFFSET,
3358                                 sizeof(rtcpdata) - AST_FRIENDLY_OFFSET,
3359                                 0, &addr)) < 0) {
3360                 ast_assert(errno != EBADF);
3361                 if (errno != EAGAIN) {
3362                         ast_log(LOG_WARNING, "RTCP Read error: %s.  Hanging up.\n",
3363                                 (errno) ? strerror(errno) : "Unspecified");
3364                         return NULL;
3365                 }
3366                 return &ast_null_frame;
3367         }
3368
3369         /* If this was handled by the ICE session don't do anything further */
3370         if (!res) {
3371                 return &ast_null_frame;
3372         }
3373
3374         if (!*(rtcpdata + AST_FRIENDLY_OFFSET)) {
3375                 struct sockaddr_in addr_tmp;
3376                 struct ast_sockaddr addr_v4;
3377
3378                 if (ast_sockaddr_is_ipv4(&addr)) {
3379                         ast_sockaddr_to_sin(&addr, &addr_tmp);
3380                 } else if (ast_sockaddr_ipv4_mapped(&addr, &addr_v4)) {
3381                         ast_debug(1, "Using IPv6 mapped address %s for STUN\n",
3382                                   ast_sockaddr_stringify(&addr));
3383                         ast_sockaddr_to_sin(&addr_v4, &addr_tmp);
3384                 } else {
3385                         ast_debug(1, "Cannot do STUN for non IPv4 address %s\n",
3386                                   ast_sockaddr_stringify(&addr));
3387                         return &ast_null_frame;
3388                 }
3389                 if ((ast_stun_handle_packet(rtp->rtcp->s, &addr_tmp, rtcpdata + AST_FRIENDLY_OFFSET, res, NULL, NULL) == AST_STUN_ACCEPT)) {
3390                         ast_sockaddr_from_sin(&addr, &addr_tmp);
3391                         ast_sockaddr_copy(&rtp->rtcp->them, &addr);
3392                 }
3393                 return &ast_null_frame;
3394         }
3395
3396         packetwords = res / 4;
3397
3398         if (ast_rtp_instance_get_prop(instance, AST_RTP_PROPERTY_NAT)) {
3399                 /* Send to whoever sent to us */
3400                 if (ast_sockaddr_cmp(&rtp->rtcp->them, &addr)) {
3401                         ast_sockaddr_copy(&rtp->rtcp->them, &addr);
3402                         if (rtpdebug) {
3403                                 ast_debug(0, "RTCP NAT: Got RTCP from other end. Now sending to address %s\n",
3404                                           ast_sockaddr_stringify(&rtp->rtcp->them));
3405                         }
3406                 }
3407         }
3408
3409         ast_debug(1, "Got RTCP report of %d bytes\n", res);
3410
3411         while (position < packetwords) {
3412                 int i, pt, rc;
3413                 unsigned int length;
3414                 struct ast_json *message_blob;
3415                 RAII_VAR(struct ast_rtp_rtcp_report *, rtcp_report, NULL, ao2_cleanup);
3416
3417                 i = position;
3418                 length = ntohl(rtcpheader[i]);
3419                 pt = (length & 0xff0000) >> 16;
3420                 rc = (length & 0x1f000000) >> 24;
3421                 length &= 0xffff;
3422
3423                 rtcp_report = ast_rtp_rtcp_report_alloc(rc);
3424                 if (!rtcp_report) {
3425                         return &ast_null_frame;
3426                 }
3427                 rtcp_report->reception_report_count = rc;
3428                 rtcp_report->ssrc = ntohl(rtcpheader[i + 1]);
3429
3430                 if ((i + length) > packetwords) {
3431                         if (rtpdebug) {
3432                                 ast_debug(1, "RTCP Read too short\n");
3433                         }
3434                         return &ast_null_frame;
3435                 }
3436
3437                 if (rtcp_debug_test_addr(&addr)) {
3438                         ast_verbose("\n\nGot RTCP from %s\n",
3439                                     ast_sockaddr_stringify(&addr));
3440                         ast_verbose("PT: %d(%s)\n", pt, (pt == RTCP_PT_SR) ? "Sender Report" :
3441                                                         (pt == RTCP_PT_RR) ? "Receiver Report" :
3442                                                         (pt == RTCP_PT_FUR) ? "H.261 FUR" : "Unknown");
3443                         ast_verbose("Reception reports: %d\n", rc);
3444                         ast_verbose("SSRC of sender: %u\n", rtcp_report->ssrc);
3445                 }
3446
3447                 i += 2; /* Advance past header and ssrc */
3448                 if (rc == 0 && pt == RTCP_PT_RR) {
3449                         /* We're receiving a receiver report with no reports, which is ok */
3450                         position += (length + 1);
3451                         continue;
3452                 }
3453                 switch (pt) {
3454                 case RTCP_PT_SR:
3455                         gettimeofday(&rtp->rtcp->rxlsr, NULL);
3456                         rtp->rtcp->themrxlsr = ((ntohl(rtcpheader[i]) & 0x0000ffff) << 16) | ((ntohl(rtcpheader[i + 1]) & 0xffff0000) >> 16);
3457                         rtp->rtcp->spc = ntohl(rtcpheader[i + 3]);
3458                         rtp->rtcp->soc = ntohl(rtcpheader[i + 4]);
3459
3460                         rtcp_report->type = RTCP_PT_SR;
3461                         rtcp_report->sender_information.packet_count = rtp->rtcp->spc;
3462                         rtcp_report->sender_information.octet_count = rtp->rtcp->soc;
3463                         ntp2timeval((unsigned int)ntohl(rtcpheader[i]),
3464                                         (unsigned int)ntohl(rtcpheader[i + 1]),
3465                                         &rtcp_report->sender_information.ntp_timestamp);
3466                         rtcp_report->sender_information.rtp_timestamp = ntohl(rtcpheader[i + 2]);
3467                         if (rtcp_debug_test_addr(&addr)) {
3468                                 ast_verbose("NTP timestamp: %u.%010u\n",
3469                                                 (unsigned int)rtcp_report->sender_information.ntp_timestamp.tv_sec,
3470                                                 (unsigned int)rtcp_report->sender_information.ntp_timestamp.tv_usec * 4096);
3471                                 ast_verbose("RTP timestamp: %u\n", rtcp_report->sender_information.rtp_timestamp);
3472                                 ast_verbose("SPC: %u\tSOC: %u\n",
3473                                                 rtcp_report->sender_information.packet_count,
3474                                                 rtcp_report->sender_information.octet_count);
3475                         }
3476                         i += 5;
3477                         if (rc < 1) {
3478                                 break;
3479                         }
3480                         /* Intentional fall through */
3481                 case RTCP_PT_RR:
3482                         if (rtcp_report->type != RTCP_PT_SR) {
3483                                 rtcp_report->type = RTCP_PT_RR;
3484                         }
3485
3486                         /* Don't handle multiple reception reports (rc > 1) yet */
3487                         report_block = ast_calloc(1, sizeof(*report_block));
3488                         if (!report_block) {
3489                                 return &ast_null_frame;
3490                         }
3491                         rtcp_report->report_block[report_counter] = report_block;
3492                         report_block->source_ssrc = ntohl(rtcpheader[i]);
3493                         report_block->lost_count.packets = ntohl(rtcpheader[i + 1]) & 0x00ffffff;
3494                         report_block->lost_count.fraction = ((ntohl(rtcpheader[i + 1]) & 0xff000000) >> 24);
3495                         report_block->highest_seq_no = ntohl(rtcpheader[i + 2]);
3496                         report_block->ia_jitter =  ntohl(rtcpheader[i + 3]);
3497                         report_block->lsr = ntohl(rtcpheader[i + 4]);
3498                         report_block->dlsr = ntohl(rtcpheader[i + 5]);
3499                         if (report_block->lsr
3500                                 && update_rtt_stats(rtp, report_block->lsr, report_block->dlsr)
3501                                 && rtcp_debug_test_addr(&addr)) {
3502                                 struct timeval now;
3503                                 unsigned int lsr_now, lsw, msw;
3504                                 gettimeofday(&now, NULL);
3505                                 timeval2ntp(now, &msw, &lsw);
3506                                 lsr_now = (((msw & 0xffff) << 16) | ((lsw & 0xffff0000) >> 16));
3507                                 ast_verbose("Internal RTCP NTP clock skew detected: "
3508                                                    "lsr=%u, now=%u, dlsr=%u (%d:%03dms), "
3509                                                 "diff=%d\n",
3510                                                 report_block->lsr, lsr_now, report_block->dlsr, report_block->dlsr / 65536,
3511                                                 (report_block->dlsr % 65536) * 1000 / 65536,
3512                                                 report_block->dlsr - (lsr_now - report_block->lsr));
3513                         }
3514                         update_jitter_stats(rtp, report_block->ia_jitter);
3515                         update_lost_stats(rtp, report_block->lost_count.packets);
3516                         rtp->rtcp->reported_jitter_count++;
3517
3518                         if (rtcp_debug_test_addr(&addr)) {
3519                         ast_verbose("  Fraction lost: %u\n", report_block->lost_count.fraction);
3520                                 ast_verbose("  Packets lost so far: %u\n", report_block->lost_count.packets);
3521                                 ast_verbose("  Highest sequence number: %u\n", report_block->highest_seq_no & 0x0000ffff);
3522                                 ast_verbose("  Sequence number cycles: %u\n", report_block->highest_seq_no >> 16);
3523                                 ast_verbose("  Interarrival jitter: %u\n", report_block->ia_jitter);
3524                                 ast_verbose("  Last SR(our NTP): %lu.%010lu\n",(unsigned long)(report_block->lsr) >> 16,((unsigned long)(report_block->lsr) << 16) * 4096);
3525                                 ast_verbose("  DLSR: %4.4f (sec)\n",(double)report_block->dlsr / 65536.0);
3526                                 ast_verbose("  RTT: %4.4f(sec)\n", rtp->rtcp->rtt);
3527                         }
3528                         report_counter++;
3529
3530                         /* If and when we handle more than one report block, this should occur outside
3531                          * this loop.
3532                          */
3533                         message_blob = ast_json_pack("{s: s, s: f}",
3534                                         "from", ast_sockaddr_stringify(&addr),
3535                                         "rtt", rtp->rtcp->rtt);
3536                         ast_rtp_publish_rtcp_message(instance, ast_rtp_rtcp_received_type(),
3537                                         rtcp_report,
3538                                         message_blob);
3539                         ast_json_unref(message_blob);
3540                         break;
3541                 case RTCP_PT_FUR:
3542                 /* Handle RTCP FIR as FUR */
3543                 case RTCP_PT_PSFB:
3544                         if (rtcp_debug_test_addr(&addr)) {
3545                                 ast_verbose("Received an RTCP Fast Update Request\n");
3546                         }
3547                         rtp->f.frametype = AST_FRAME_CONTROL;
3548                         rtp->f.subclass.integer = AST_CONTROL_VIDUPDATE;
3549                         rtp->f.datalen = 0;
3550                         rtp->f.samples = 0;
3551                         rtp->f.mallocd = 0;
3552                         rtp->f.src = "RTP";
3553                         f = &rtp->f;
3554                         break;
3555                 case RTCP_PT_SDES:
3556                         if (rtcp_debug_test_addr(&addr)) {
3557                                 ast_verbose("Received an SDES from %s\n",
3558                                             ast_sockaddr_stringify(&rtp->rtcp->them));
3559                         }
3560                         break;
3561                 case RTCP_PT_BYE:
3562                         if (rtcp_debug_test_addr(&addr)) {
3563                                 ast_verbose("Received a BYE from %s\n",
3564                                             ast_sockaddr_stringify(&rtp->rtcp->them));
3565                         }
3566                         break;
3567                 default:
3568                         ast_debug(1, "Unknown RTCP packet (pt=%d) received from %s\n",
3569                                   pt, ast_sockaddr_stringify(&rtp->rtcp->them));
3570                         break;
3571                 }
3572                 position += (length + 1);
3573         }
3574         rtp->rtcp->rtcp_info = 1;
3575
3576         return f;
3577 }
3578
3579 static int bridge_p2p_rtp_write(struct ast_rtp_instance *instance, unsigned int *rtpheader, int len, int hdrlen)
3580 {
3581         struct ast_rtp_instance *instance1 = ast_rtp_instance_get_bridged(instance);
3582         struct ast_rtp *rtp = ast_rtp_instance_get_data(instance), *bridged = ast_rtp_instance_get_data(instance1);
3583         int res = 0, payload = 0, bridged_payload = 0, mark;
3584         struct ast_rtp_payload_type payload_type;
3585         int reconstruct = ntohl(rtpheader[0]);
3586         struct ast_sockaddr remote_address = { {0,} };
3587         int ice;