channels/chan_sip.c

   1 /*
   2  * Asterisk -- A telephony toolkit for Linux.
   3  *
   4  * Implementation of Session Initiation Protocol
   5  *
   6  * Copyright (C) 2004, Digium, Inc.
   7  *
   8  * Mark Spencer <markster@digium.com>
   9  *
  10  * This program is free software, distributed under the terms of
  11  * the GNU General Public License
  12  */
  13
  14
  15 #include <stdio.h>
  16 #include <ctype.h>
  17 #include <string.h>
  18 #include <asterisk/lock.h>
  19 #include <asterisk/channel.h>
  20 #include <asterisk/channel_pvt.h>
  21 #include <asterisk/config.h>
  22 #include <asterisk/logger.h>
  23 #include <asterisk/module.h>
  24 #include <asterisk/pbx.h>
  25 #include <asterisk/options.h>
  26 #include <asterisk/lock.h>
  27 #include <asterisk/sched.h>
  28 #include <asterisk/io.h>
  29 #include <asterisk/rtp.h>
  30 #include <asterisk/acl.h>
  31 #include <asterisk/manager.h>
  32 #include <asterisk/callerid.h>
  33 #include <asterisk/cli.h>
  34 #include <asterisk/md5.h>
  35 #include <asterisk/app.h>
  36 #include <asterisk/musiconhold.h>
  37 #include <asterisk/dsp.h>
  38 #include <asterisk/features.h>
  39 #include <asterisk/acl.h>
  40 #include <asterisk/srv.h>
  41 #include <asterisk/astdb.h>
  42 #include <asterisk/causes.h>
  43 #include <asterisk/utils.h>
  44 #ifdef OSP_SUPPORT
  45 #include <asterisk/astosp.h>
  46 #endif
  47 #include <sys/socket.h>
  48 #include <sys/ioctl.h>
  49 #include <net/if.h>
  50 #include <errno.h>
  51 #include <unistd.h>
  52 #include <stdlib.h>
  53 #include <fcntl.h>
  54 #include <netdb.h>
  55 #include <arpa/inet.h>
  56 #include <signal.h>
  57 #include <sys/signal.h>
  58 #include <netinet/in_systm.h>
  59 #include <netinet/ip.h>
  60
  61 #ifndef DEFAULT_USERAGENT
  62 #define DEFAULT_USERAGENT "Asterisk PBX"
  63 #endif
  64
  65 #define VIDEO_CODEC_MASK        0x1fc0000 /* Video codecs from H.261 thru AST_FORMAT_MAX_VIDEO */
  66 #ifndef IPTOS_MINCOST
  67 #define IPTOS_MINCOST 0x02
  68 #endif
  69
  70 /* #define VOCAL_DATA_HACK */
  71
  72 #define SIPDUMPER
  73 #define DEFAULT_DEFAULT_EXPIRY  120
  74 #define DEFAULT_MAX_EXPIRY      3600
  75
  76 /* guard limit must be larger than guard secs */
  77 /* guard min must be < 1000, and should be >= 250 */
  78 #define EXPIRY_GUARD_SECS       15      /* How long before expiry do we reregister */
  79 #define EXPIRY_GUARD_LIMIT      30      /* Below here, we use EXPIRY_GUARD_PCT instead of EXPIRY_GUARD_SECS */
  80 #define EXPIRY_GUARD_MIN        500     /* This is the minimum guard time applied. If GUARD_PCT turns out
  81                                         to be lower than this, it will use this time instead. This is in
  82                                         milliseconds. */
  83 #define EXPIRY_GUARD_PCT        0.20    /* Percentage of expires timeout to use when below EXPIRY_GUARD_LIMIT */
  84
  85 #ifndef MAX
  86 #define MAX(a,b) ((a) > (b) ? (a) : (b))
  87 #endif
  88
  89 #define CALLERID_UNKNOWN        "Unknown"
  90
  91 /* --- Choices for DTMF support in SIP channel */
  92 #define SIP_DTMF_RFC2833        (1 << 0)
  93 #define SIP_DTMF_INBAND         (1 << 1)
  94 #define SIP_DTMF_INFO           (1 << 2)
  95
  96 static int max_expiry = DEFAULT_MAX_EXPIRY;
  97 static int default_expiry = DEFAULT_DEFAULT_EXPIRY;
  98
  99 #define DEFAULT_MAXMS           2000            /* Must be faster than 2 seconds by default */
 100 #define DEFAULT_FREQ_OK         60 * 1000               /* How often to check for the host to be up */
 101 #define DEFAULT_FREQ_NOTOK      10 * 1000               /* How often to check, if the host is down... */
 102
 103 #define DEFAULT_RETRANS         1000                    /* How frequently to retransmit */
 104 #define MAX_RETRANS             5                       /* Try only 5 times for retransmissions */
 105
 106                                                         /* SIP Debug            */
 107 #define DEBUG_READ      0                               /* Recieved data        */
 108 #define DEBUG_SEND      1                               /* Transmit data        */
 109
 110 static char *desc = "Session Initiation Protocol (SIP)";
 111 static char *type = "SIP";
 112 static char *tdesc = "Session Initiation Protocol (SIP)";
 113 static char *config = "sip.conf";
 114
 115 #define DEFAULT_SIP_PORT        5060    /* From RFC 2543 */
 116 #define SIP_MAX_PACKET  4096            /* Also from RFC 2543, should sub headers tho */
 117
 118 #define ALLOWED_METHODS "INVITE, ACK, CANCEL, OPTIONS, BYE, REFER"
 119
 120 static char default_useragent[AST_MAX_EXTENSION] = DEFAULT_USERAGENT;
 121
 122 static char default_context[AST_MAX_EXTENSION] = "default";
 123
 124 static char default_language[MAX_LANGUAGE] = "";
 125
 126 static char default_callerid[AST_MAX_EXTENSION] = "asterisk";
 127
 128 static char default_fromdomain[AST_MAX_EXTENSION] = "";
 129
 130 static char notifymime[AST_MAX_EXTENSION] = "application/simple-message-summary";
 131
 132 static int srvlookup = 0;               /* SRV Lookup on or off. Default is off, RFC behavior is on */
 133
 134 static int pedanticsipchecking = 0;     /* Extra checking ?  Default off */
 135
 136 static int autocreatepeer = 0;          /* Auto creation of peers at registration? Default off. */
 137
 138 static int relaxdtmf = 0;
 139
 140 static int global_rtptimeout = 0;
 141
 142 static int global_rtpholdtimeout = 0;
 143
 144 static int global_trustrpid = 0;        /* Trust RPID headers? Default off. */
 145
 146 static int global_progressinband = 0;
 147
 148 #ifdef OSP_SUPPORT
 149 static int global_ospauth = 0;
 150 #endif
 151
 152 #define DEFAULT_MWITIME 10
 153 static int global_mwitime = DEFAULT_MWITIME;    /* Time between MWI checks for peers */
 154
 155 static int usecnt =0;
 156 AST_MUTEX_DEFINE_STATIC(usecnt_lock);
 157
 158 /* Protect the interface list (of sip_pvt's) */
 159 AST_MUTEX_DEFINE_STATIC(iflock);
 160
 161 /* Protect the monitoring thread, so only one process can kill or start it, and not
 162    when it's doing something critical. */
 163 AST_MUTEX_DEFINE_STATIC(netlock);
 164
 165 AST_MUTEX_DEFINE_STATIC(monlock);
 166
 167 /* This is the thread for the monitor which checks for input on the channels
 168    which are not currently in use.  */
 169 static pthread_t monitor_thread = AST_PTHREADT_NULL;
 170
 171 static int restart_monitor(void);
 172
 173 /* Codecs that we support by default: */
 174 static int global_capability = AST_FORMAT_ULAW | AST_FORMAT_ALAW | AST_FORMAT_GSM | AST_FORMAT_H263;
 175 static int noncodeccapability = AST_RTP_DTMF;
 176
 177 static char ourhost[256];
 178 static struct in_addr __ourip;
 179 static int ourport;
 180
 181 static int sipdebug = 0;
 182 static struct sockaddr_in debugaddr;
 183
 184 static int tos = 0;
 185
 186 static int videosupport = 0;
 187
 188 static int global_dtmfmode = SIP_DTMF_RFC2833;          /* DTMF mode default */
 189 static int recordhistory = 0;
 190 static int global_promiscredir;
 191
 192 static char global_musicclass[MAX_LANGUAGE] = "";       /* Global music on hold class */
 193 static char global_realm[AST_MAX_EXTENSION] = "asterisk";       /* Default realm */
 194 static char regcontext[AST_MAX_EXTENSION] = "";
 195
 196 /* Expire slowly */
 197 static int expiry = 900;
 198
 199 static struct sched_context *sched;
 200 static struct io_context *io;
 201 /* The private structures of the  sip channels are linked for
 202    selecting outgoing channels */
 203
 204 #define SIP_MAX_HEADERS         64
 205 #define SIP_MAX_LINES           64
 206
 207 #define DEC_IN_USE      0
 208 #define INC_IN_USE      1
 209 #define DEC_OUT_USE     2
 210 #define INC_OUT_USE     3
 211
 212 static struct sip_codec_pref {
 213         int codec;
 214         struct sip_codec_pref *next;
 215 } *prefs;
 216
 217 /* sip_request: The data grabbed from the UDP socket */
 218 struct sip_request {
 219   char *rlPart1; /* SIP Method Name or "SIP/2.0" protocol version */
 220   char *rlPart2; /* The Request URI or Response Status */
 221         int len;
 222         int headers;                                    /* SIP Headers */
 223         char *header[SIP_MAX_HEADERS];
 224         int lines;                                              /* SDP Content */
 225         char *line[SIP_MAX_LINES];
 226         char data[SIP_MAX_PACKET];
 227 };
 228
 229 struct sip_pkt;
 230
 231 struct sip_route {
 232         struct sip_route *next;
 233         char hop[0];
 234 };
 235
 236 struct sip_history {
 237         char event[80];
 238         struct sip_history *next;
 239 };
 240
 241 /* sip_pvt: PVT structures are used for each SIP conversation, ie. a call  */
 242 static struct sip_pvt {
 243         ast_mutex_t lock;                       /* Channel private lock */
 244         char callid[80];                        /* Global CallID */
 245         char randdata[80];                      /* Random data */
 246         unsigned int ocseq;                     /* Current outgoing seqno */
 247         unsigned int icseq;                     /* Current incoming seqno */
 248         unsigned int callgroup;                 /* Call group */
 249         unsigned int pickupgroup;               /* Pickup group */
 250         int lastinvite;                         /* Last Cseq of invite */
 251         int alreadygone;                        /* Whether or not we've already been destroyed by or peer */
 252         int needdestroy;                        /* if we need to be destroyed */
 253         int capability;                         /* Special capability (codec) */
 254         int novideo;                            /* Didn't get video in invite, don't offer */
 255         int jointcapability;                    /* Supported capability at both ends (codecs ) */
 256         int peercapability;                     /* Supported peer capability */
 257         int prefcodec;                          /* Preferred codec (outbound only) */
 258         int noncodeccapability;
 259         int callingpres;                        /* Calling presentation */
 260         int outgoing;                           /* Outgoing or incoming call? */
 261         int authtries;                          /* Times we've tried to authenticate */
 262         int insecure;                           /* Don't check source port/ip */
 263         int expiry;                             /* How long we take to expire */
 264         int branch;                             /* One random number */
 265         int canreinvite;                        /* Do we support reinvite */
 266         int ringing;                            /* Have sent 180 ringing */
 267         int progress;                           /* Have sent 183 message progress */
 268         int useclientcode;                      /* Trust X-ClientCode info message */
 269         int tag;                                /* Another random number */
 270         int nat;                                /* Whether to try to support NAT */
 271         int sessionid;                          /* SDP Session ID */
 272         int sessionversion;                     /* SDP Session Version */
 273         struct sockaddr_in sa;                  /* Our peer */
 274         struct sockaddr_in redirip;             /* Where our RTP should be going if not to us */
 275         struct sockaddr_in vredirip;            /* Where our Video RTP should be going if not to us */
 276         int redircodecs;                                /* Redirect codecs */
 277         struct sockaddr_in recv;                /* Received as */
 278         struct in_addr ourip;                   /* Our IP */
 279         struct ast_channel *owner;              /* Who owns us */
 280         char exten[AST_MAX_EXTENSION];          /* Extension where to start */
 281         char refer_to[AST_MAX_EXTENSION];       /* Place to store REFER-TO extension */
 282         char referred_by[AST_MAX_EXTENSION];    /* Place to store REFERRED-BY extension */
 283         char refer_contact[AST_MAX_EXTENSION];  /* Place to store Contact info from a REFER extension */
 284         struct sip_pvt *refer_call;             /* Call we are referring */
 285         struct sip_route *route;                /* Head of linked list of routing steps (fm Record-Route) */
 286         int route_persistant;                   /* Is this the "real" route? */
 287         char from[256];                         /* The From: header */
 288         char useragent[256];                    /* User agent in SIP request */
 289         char context[AST_MAX_EXTENSION];        /* Context for this call */
 290         char fromdomain[AST_MAX_EXTENSION];     /* Domain to show in the from field */
 291         char fromuser[AST_MAX_EXTENSION];       /* Domain to show in the user field */
 292         char tohost[AST_MAX_EXTENSION];         /* Host we should put in the "to" field */
 293         char language[MAX_LANGUAGE];            /* Default language for this call */
 294         char musicclass[MAX_LANGUAGE];          /* Music on Hold class */
 295         char rdnis[256];                        /* Referring DNIS */
 296         char theirtag[256];                     /* Their tag */
 297         char username[256];
 298         char peername[256];
 299         char authname[256];                     /* Who we use for authentication */
 300         char uri[256];                          /* Original requested URI */
 301         char peersecret[256];
 302         char peermd5secret[256];
 303         char cid_num[256];                      /* Caller*ID */
 304         char cid_name[256];                     /* Caller*ID */
 305         char via[256];
 306         char fullcontact[128];          /* Extra parameters to go in the "To" header */
 307         char accountcode[20];                   /* Account code */
 308         char our_contact[256];                  /* Our contact header */
 309         char realm[256];                        /* Authorization realm */
 310         char nonce[256];                        /* Authorization nonce */
 311         char opaque[256];                       /* Opaque nonsense */
 312         char qop[80];                           /* Quality of Protection, since SIP wasn't complicated enough yet. */
 313         char domain[256];                       /* Authorization nonce */
 314         char lastmsg[256];                      /* Last Message sent/received */
 315         int amaflags;                           /* AMA Flags */
 316         int pendinginvite;                      /* Any pending invite */
 317         int needreinvite;                       /* Do we need to send another reinvite? */
 318         int pendingbye;                         /* Need to send bye after we ack? */
 319         int gotrefer;                           /* Got a refer? */
 320 #ifdef OSP_SUPPORT
 321         int ospauth;                            /* Allow OSP Authentication */
 322         int osphandle;                          /* OSP Handle for call */
 323         time_t ospstart;                        /* OSP Start time */
 324 #endif
 325         struct sip_request initreq;             /* Initial request */
 326
 327         int maxtime;                            /* Max time for first response */
 328         int initid;                             /* Auto-congest ID if appropriate */
 329         int autokillid;                         /* Auto-kill ID */
 330         time_t lastrtprx;                       /* Last RTP received */
 331         int rtptimeout;                         /* RTP timeout time */
 332         int rtpholdtimeout;                     /* RTP timeout when on hold */
 333
 334         int subscribed;
 335         int stateid;
 336         int dialogver;
 337         int promiscredir;                       /* Promiscuous redirection */
 338
 339         int trustrpid;
 340         int progressinband;
 341
 342         int dtmfmode;
 343         struct ast_dsp *vad;
 344
 345         struct sip_peer *peerpoke;              /* If this calls is to poke a peer, which one */
 346         struct sip_registry *registry;          /* If this is a REGISTER call, to which registry */
 347         struct ast_rtp *rtp;                    /* RTP Session */
 348         struct ast_rtp *vrtp;                   /* Video RTP session */
 349         struct sip_pkt *packets;                /* Packets scheduled for re-transmission */
 350         struct sip_history *history;    /* History of this SIP dialog */
 351         struct sip_pvt *next;                   /* Next call in chain */
 352 } *iflist = NULL;
 353
 354 #define FLAG_RESPONSE (1 << 0)
 355 #define FLAG_FATAL (1 << 1)
 356
 357 /* sip packet - read in sipsock_read, transmitted in send_request */
 358 struct sip_pkt {
 359         struct sip_pkt *next;                           /* Next packet */
 360         int retrans;                                            /* Retransmission number */
 361         int seqno;                                                      /* Sequence number */
 362         int flags;                                                      /* non-zero if this is a response packet (e.g. 200 OK) */
 363         struct sip_pvt *owner;                          /* Owner call */
 364         int retransid;                                          /* Retransmission ID */
 365         int packetlen;                                          /* Length of packet */
 366         char data[0];
 367 };
 368
 369 /* Structure for SIP user data. User's place calls to us */
 370 struct sip_user {
 371         /* Users who can access various contexts */
 372         char name[80];
 373         char secret[80];
 374         char md5secret[80];
 375         char context[80];
 376         char cid_num[80];
 377         char cid_name[80];
 378         char accountcode[20];
 379         char language[MAX_LANGUAGE];
 380         char musicclass[MAX_LANGUAGE];  /* Music on Hold class */
 381         char useragent[256];            /* User agent in SIP request */
 382         unsigned int callgroup;
 383         unsigned int pickupgroup;
 384         int nat;
 385         int amaflags;
 386         int callingpres;
 387         int insecure;
 388         int canreinvite;
 389         int capability;
 390 #ifdef OSP_SUPPORT
 391         int ospauth;                            /* Allow OSP Authentication */
 392 #endif
 393         int dtmfmode;
 394         int inUse;
 395         int incominglimit;
 396         int outUse;
 397         int outgoinglimit;
 398         int promiscredir;
 399         int useclientcode;
 400         int trustrpid;
 401         int progressinband;
 402         struct ast_ha *ha;
 403         int temponly;
 404         struct sip_user *next;
 405 };
 406
 407 /* Structure for SIP peer data, we place calls to peers if registred  or fixed IP address (host) */
 408 struct sip_peer {
 409         char name[80];
 410         char secret[80];
 411         char md5secret[80];
 412         char context[80];               /* JK02: peers need context too to allow parking etc */
 413         char username[80];
 414         char tohost[80];
 415         char regexten[AST_MAX_EXTENSION];       /* Extension to register (if regcontext is used) */
 416         char fromuser[80];
 417         char fromdomain[80];
 418         char fullcontact[128];
 419         char cid_num[80];
 420         char cid_name[80];
 421         char mailbox[AST_MAX_EXTENSION];
 422         char language[MAX_LANGUAGE];
 423         char musicclass[MAX_LANGUAGE];  /* Music on Hold class */
 424         char useragent[256];            /* User agent in SIP request */
 425         int lastmsgssent;
 426         time_t  lastmsgcheck;
 427         int dynamic;
 428         int expire;
 429         int expiry;
 430         int capability;
 431         int rtptimeout;
 432         int rtpholdtimeout;
 433         int insecure;
 434 #ifdef OSP_SUPPORT
 435         int ospauth;                            /* Allow OSP Authentication */
 436 #endif
 437         int nat;
 438         int canreinvite;
 439         unsigned int callgroup;
 440         unsigned int pickupgroup;
 441         int promiscredir;
 442         int dtmfmode;
 443         int trustrpid;
 444         int useclientcode;
 445         int progressinband;
 446         struct sockaddr_in addr;
 447         struct in_addr mask;
 448
 449         /* Qualification */
 450         struct sip_pvt *call;           /* Call pointer */
 451         int pokeexpire;                         /* When to expire poke */
 452         int lastms;                                     /* How long last response took (in ms), or -1 for no response */
 453         int maxms;                                      /* Max ms we will accept for the host to be up, 0 to not monitor */
 454         struct timeval ps;                      /* Ping send time */
 455
 456         struct sockaddr_in defaddr;
 457         struct ast_ha *ha;
 458         int delme;
 459         int selfdestruct;
 460         int lastmsg;
 461         int temponly;
 462         struct sip_peer *next;
 463 };
 464
 465 AST_MUTEX_DEFINE_STATIC(sip_reload_lock);
 466 static int sip_reloading = 0;
 467
 468 #define REG_STATE_UNREGISTERED 0
 469 #define REG_STATE_REGSENT          1
 470 #define REG_STATE_AUTHSENT         2
 471 #define REG_STATE_REGISTERED   3
 472 #define REG_STATE_REJECTED         4
 473 #define REG_STATE_TIMEOUT          5
 474 #define REG_STATE_NOAUTH           6
 475
 476 #define SIP_NAT_NEVER           0
 477 #define SIP_NAT_RFC3581         (1 << 0)
 478 #define SIP_NAT_ROUTE           (1 << 2)
 479 #define SIP_NAT_ALWAYS          (SIP_NAT_ROUTE | SIP_NAT_RFC3581)
 480
 481 /* sip_registry: Registrations with other SIP proxies */
 482 struct sip_registry {
 483         int portno;                             /* Optional port override */
 484         char username[80];              /* Who we are registering as */
 485         char authuser[80];              /* Who we *authenticate* as */
 486         char hostname[80];
 487         char secret[80];                /* Password or key name in []'s */
 488         char md5secret[80];
 489         char contact[80];               /* Contact extension */
 490         char random[80];
 491         int expire;                     /* Sched ID of expiration */
 492         int timeout;                    /* sched id of sip_reg_timeout */
 493         int refresh;                    /* How often to refresh */
 494         struct sip_pvt *call;           /* create a sip_pvt structure for each outbound "registration call" in progress */
 495         int regstate;
 496         int callid_valid;               /* 0 means we haven't chosen callid for this registry yet. */
 497         char callid[80];                /* Global CallID for this registry */
 498         unsigned int ocseq;             /* Sequence number we got to for REGISTERs for this registry */
 499         struct sockaddr_in us;          /* Who the server thinks we are */
 500         struct sip_registry *next;
 501 };
 502
 503 /*--- The user list: Users and friends ---*/
 504 static struct ast_user_list {
 505         struct sip_user *users;
 506         ast_mutex_t lock;
 507 } userl;
 508
 509 /*--- The peer list: Peers and Friends ---*/
 510 static struct ast_peer_list {
 511         struct sip_peer *peers;
 512         ast_mutex_t lock;
 513 } peerl;
 514
 515 /*--- The register list: Other SIP proxys we register with and call ---*/
 516 static struct ast_register_list {
 517         struct sip_registry *registrations;
 518         ast_mutex_t lock;
 519         int recheck;
 520 } regl;
 521
 522
 523 #define REINVITE_INVITE         1
 524 #define REINVITE_UPDATE         2
 525
 526 static int __sip_do_register(struct sip_registry *r);
 527
 528 static int sipsock  = -1;
 529 static int global_nat = SIP_NAT_RFC3581;
 530 static int global_canreinvite = REINVITE_INVITE;
 531
 532
 533 static struct sockaddr_in bindaddr;
 534 static struct sockaddr_in externip;
 535 static struct ast_ha *localaddr;
 536
 537 static struct ast_frame  *sip_read(struct ast_channel *ast);
 538 static int transmit_response(struct sip_pvt *p, char *msg, struct sip_request *req);
 539 static int transmit_response_with_sdp(struct sip_pvt *p, char *msg, struct sip_request *req, int retrans);
 540 static int transmit_response_with_auth(struct sip_pvt *p, char *msg, struct sip_request *req, char *rand, int reliable, char *header);
 541 static int transmit_request(struct sip_pvt *p, char *msg, int inc, int reliable, int newbranch);
 542 static int transmit_request_with_auth(struct sip_pvt *p, char *msg, int inc, int reliable, int newbranch);
 543 static int transmit_invite(struct sip_pvt *p, char *msg, int sendsdp, char *auth, char *authheader, char *vxml_url,char *distinctive_ring, char *osptoken,int init);
 544 static int transmit_reinvite_with_sdp(struct sip_pvt *p);
 545 static int transmit_info_with_digit(struct sip_pvt *p, char digit);
 546 static int transmit_message_with_text(struct sip_pvt *p, char *text);
 547 static int transmit_refer(struct sip_pvt *p, char *dest);
 548 static struct sip_peer *temp_peer(char *name);
 549 static int do_proxy_auth(struct sip_pvt *p, struct sip_request *req, char *header, char *respheader, char *msg, int init);
 550 static void free_old_route(struct sip_route *route);
 551 static int build_reply_digest(struct sip_pvt *p, char *orig_header, char *digest, int digest_len);
 552 static int update_user_counter(struct sip_pvt *fup, int event);
 553 static void prune_peers(void);
 554 static int sip_do_reload(void);
 555
 556
 557 /*--- sip_debug_test_addr: See if we pass debug IP filter */
 558 static inline int sip_debug_test_addr(struct sockaddr_in *addr)
 559 {
 560         if (sipdebug == 0)
 561                 return 0;
 562         if (debugaddr.sin_addr.s_addr) {
 563                 if (((ntohs(debugaddr.sin_port) != 0)
 564                         && (debugaddr.sin_port != addr->sin_port))
 565                         || (debugaddr.sin_addr.s_addr != addr->sin_addr.s_addr))
 566                         return 0;
 567         }
 568         return 1;
 569 }
 570
 571 static inline int sip_debug_test_pvt(struct sip_pvt *p)
 572 {
 573         if (sipdebug == 0)
 574                 return 0;
 575         return sip_debug_test_addr(((p->nat & SIP_NAT_ROUTE) ? &p->recv : &p->sa));
 576 }
 577
 578
 579 /*--- __sip_xmit: Transmit SIP message ---*/
 580 static int __sip_xmit(struct sip_pvt *p, char *data, int len)
 581 {
 582         int res;
 583         char iabuf[INET_ADDRSTRLEN];
 584         if (p->nat & SIP_NAT_ROUTE)
 585             res=sendto(sipsock, data, len, 0, (struct sockaddr *)&p->recv, sizeof(struct sockaddr_in));
 586         else
 587             res=sendto(sipsock, data, len, 0, (struct sockaddr *)&p->sa, sizeof(struct sockaddr_in));
 588         if (res != len) {
 589                 ast_log(LOG_WARNING, "sip_xmit of %p (len %d) to %s returned %d: %s\n", data, len, ast_inet_ntoa(iabuf, sizeof(iabuf), p->sa.sin_addr), res, strerror(errno));
 590         }
 591         return res;
 592 }
 593
 594 static void sip_destroy(struct sip_pvt *p);
 595
 596 /*--- ast_sip_ouraddrfor: NAT fix - decide which IP address to use for ASterisk server? ---*/
 597 /* Only used for outbound registrations */
 598 static int ast_sip_ouraddrfor(struct in_addr *them, struct in_addr *us)
 599 {
 600         /*
 601          * Using the localaddr structure built up with localnet statements
 602          * apply it to their address to see if we need to substitute our
 603          * externip or can get away with our internal bindaddr
 604          */
 605         struct sockaddr_in theirs;
 606         theirs.sin_addr = *them;
 607         if (localaddr && externip.sin_addr.s_addr &&
 608            ast_apply_ha(localaddr, &theirs)) {
 609                 char iabuf[INET_ADDRSTRLEN];
 610                 memcpy(us, &externip.sin_addr, sizeof(struct in_addr));
 611                 ast_inet_ntoa(iabuf, sizeof(iabuf), *(struct in_addr *)&them->s_addr);
 612                 ast_log(LOG_DEBUG, "Target address %s is not local, substituting externip\n", iabuf);
 613         }
 614         else if (bindaddr.sin_addr.s_addr)
 615                 memcpy(us, &bindaddr.sin_addr, sizeof(struct in_addr));
 616         else
 617                 return ast_ouraddrfor(them, us);
 618         return 0;
 619 }
 620
 621 static int append_history(struct sip_pvt *p, char *event, char *data)
 622 {
 623         struct sip_history *hist, *prev;
 624         char *c;
 625         if (!recordhistory)
 626                 return 0;
 627         hist = malloc(sizeof(struct sip_history));
 628         if (hist) {
 629                 memset(hist, 0, sizeof(struct sip_history));
 630                 snprintf(hist->event, sizeof(hist->event), "%-15s %s", event, data);
 631                 /* Trim up nicely */
 632                 c = hist->event;
 633                 while(*c) {
 634                         if ((*c == '\r') || (*c == '\n')) {
 635                                 *c = '\0';
 636                                 break;
 637                         }
 638                         c++;
 639                 }
 640                 /* Enqueue into history */
 641                 prev = p->history;
 642                 if (prev) {
 643                         while(prev->next)
 644                                 prev = prev->next;
 645                         prev->next = hist;
 646                 } else {
 647                         p->history = hist;
 648                 }
 649         }
 650         return 0;
 651 }
 652
 653 /*--- retrans_pkt: Retransmit SIP message if no answer ---*/
 654 static int retrans_pkt(void *data)
 655 {
 656         struct sip_pkt *pkt=data, *prev, *cur;
 657         int res = 0;
 658         char iabuf[INET_ADDRSTRLEN];
 659         ast_mutex_lock(&pkt->owner->lock);
 660         if (pkt->retrans < MAX_RETRANS) {
 661                 pkt->retrans++;
 662                 if (sip_debug_test_pvt(pkt->owner)) {
 663                         if (pkt->owner->nat & SIP_NAT_ROUTE)
 664                                 ast_verbose("Retransmitting #%d (NAT):\n%s\n to %s:%d\n", pkt->retrans, pkt->data, ast_inet_ntoa(iabuf, sizeof(iabuf), pkt->owner->recv.sin_addr), ntohs(pkt->owner->recv.sin_port));
 665                         else
 666                                 ast_verbose("Retransmitting #%d (no NAT):\n%s\n to %s:%d\n", pkt->retrans, pkt->data, ast_inet_ntoa(iabuf, sizeof(iabuf), pkt->owner->sa.sin_addr), ntohs(pkt->owner->sa.sin_port));
 667                 }
 668                 append_history(pkt->owner, "ReTx", pkt->data);
 669                 __sip_xmit(pkt->owner, pkt->data, pkt->packetlen);
 670                 res = 1;
 671         } else {
 672                 ast_log(LOG_WARNING, "Maximum retries exceeded on call %s for seqno %d (%s %s)\n", pkt->owner->callid, pkt->seqno, (pkt->flags & FLAG_FATAL) ? "Critical" : "Non-critical", (pkt->flags & FLAG_RESPONSE) ? "Response" : "Request");
 673                 append_history(pkt->owner, "MaxRetries", pkt->flags & FLAG_FATAL ? "(Critical)" : "(Non-critical)");
 674                 pkt->retransid = -1;
 675                 if (pkt->flags & FLAG_FATAL) {
 676                         while(pkt->owner->owner && ast_mutex_trylock(&pkt->owner->owner->lock)) {
 677                                 ast_mutex_unlock(&pkt->owner->lock);
 678                                 usleep(1);
 679                                 ast_mutex_lock(&pkt->owner->lock);
 680                         }
 681                         if (pkt->owner->owner) {
 682                                 ast_queue_hangup(pkt->owner->owner);
 683                                 ast_mutex_unlock(&pkt->owner->owner->lock);
 684                         } else {
 685                                 /* If no owner, destroy now */
 686                                 pkt->owner->needdestroy = 1;
 687                         }
 688                 }
 689                 /* In any case, go ahead and remove the packet */
 690                 prev = NULL;
 691                 cur = pkt->owner->packets;
 692                 while(cur) {
 693                         if (cur == pkt)
 694                                 break;
 695                         prev = cur;
 696                         cur = cur->next;
 697                 }
 698                 if (cur) {
 699                         if (prev)
 700                                 prev->next = cur->next;
 701                         else
 702                                 pkt->owner->packets = cur->next;
 703                         ast_mutex_unlock(&pkt->owner->lock);
 704                         free(cur);
 705                         pkt = NULL;
 706                 } else
 707                         ast_log(LOG_WARNING, "Weird, couldn't find packet owner!\n");
 708         }
 709         if (pkt)
 710                 ast_mutex_unlock(&pkt->owner->lock);
 711         return res;
 712 }
 713
 714 /*--- __sip_reliable_xmit: transmit packet with retransmits ---*/
 715 static int __sip_reliable_xmit(struct sip_pvt *p, int seqno, int resp, char *data, int len, int fatal)
 716 {
 717         struct sip_pkt *pkt;
 718         pkt = malloc(sizeof(struct sip_pkt) + len + 1);
 719         if (!pkt)
 720                 return -1;
 721         memset(pkt, 0, sizeof(struct sip_pkt));
 722         memcpy(pkt->data, data, len);
 723         pkt->packetlen = len;
 724         pkt->next = p->packets;
 725         pkt->owner = p;
 726         pkt->seqno = seqno;
 727         pkt->flags = resp;
 728         pkt->data[len] = '\0';
 729         if (fatal)
 730                 pkt->flags |= FLAG_FATAL;
 731         /* Schedule retransmission */
 732         pkt->retransid = ast_sched_add(sched, DEFAULT_RETRANS, retrans_pkt, pkt);
 733         pkt->next = p->packets;
 734         p->packets = pkt;
 735         __sip_xmit(pkt->owner, pkt->data, pkt->packetlen);
 736         if (!strncasecmp(pkt->data, "INVITE", 6)) {
 737                 /* Note this is a pending invite */
 738                 p->pendinginvite = seqno;
 739         }
 740         return 0;
 741 }
 742
 743 /*--- __sip_autodestruct: Kill a call (called by scheduler) ---*/
 744 static int __sip_autodestruct(void *data)
 745 {
 746         struct sip_pvt *p = data;
 747         p->autokillid = -1;
 748         ast_log(LOG_DEBUG, "Auto destroying call '%s'\n", p->callid);
 749         append_history(p, "AutoDestroy", "");
 750         if (p->owner) {
 751                 ast_log(LOG_WARNING, "Autodestruct on call '%s' with owner in place\n", p->callid);
 752                 ast_queue_hangup(p->owner);
 753         } else {
 754                 sip_destroy(p);
 755         }
 756         return 0;
 757 }
 758
 759 /*--- sip_scheddestroy: Schedule destruction of SIP call ---*/
 760 static int sip_scheddestroy(struct sip_pvt *p, int ms)
 761 {
 762         char tmp[80];
 763         if (sip_debug_test_pvt(p))
 764                 ast_verbose("Scheduling destruction of call '%s' in %d ms\n", p->callid, ms);
 765         if (recordhistory) {
 766                 snprintf(tmp, sizeof(tmp), "%d ms", ms);
 767                 append_history(p, "SchedDestroy", tmp);
 768         }
 769         if (p->autokillid > -1)
 770                 ast_sched_del(sched, p->autokillid);
 771         p->autokillid = ast_sched_add(sched, ms, __sip_autodestruct, p);
 772         return 0;
 773 }
 774
 775 /*--- sip_cancel_destroy: Cancel destruction of SIP call ---*/
 776 static int sip_cancel_destroy(struct sip_pvt *p)
 777 {
 778         if (p->autokillid > -1)
 779                 ast_sched_del(sched, p->autokillid);
 780         append_history(p, "CancelDestroy", "");
 781         p->autokillid = -1;
 782         return 0;
 783 }
 784
 785 /*--- __sip_ack: Acknowledges receipt of a packet and stops retransmission ---*/
 786 static int __sip_ack(struct sip_pvt *p, int seqno, int resp, const char *msg)
 787 {
 788         struct sip_pkt *cur, *prev = NULL;
 789         int res = -1;
 790         int resetinvite = 0;
 791         /* Just in case... */
 792         if (!msg) msg = "___NEVER___";
 793         cur = p->packets;
 794         while(cur) {
 795                 if ((cur->seqno == seqno) && ((cur->flags & FLAG_RESPONSE) == resp) &&
 796                         ((cur->flags & FLAG_RESPONSE) ||
 797                          (!strncasecmp(msg, cur->data, strlen(msg)) && (cur->data[strlen(msg)] < 33)))) {
 798                         if (!resp && (seqno == p->pendinginvite)) {
 799                                 ast_log(LOG_DEBUG, "Acked pending invite %d\n", p->pendinginvite);
 800                                 p->pendinginvite = 0;
 801                                 resetinvite = 1;
 802                         }
 803                         /* this is our baby */
 804                         if (prev)
 805                                 prev->next = cur->next;
 806                         else
 807                                 p->packets = cur->next;
 808                         if (cur->retransid > -1)
 809                                 ast_sched_del(sched, cur->retransid);
 810                         free(cur);
 811                         res = 0;
 812                         break;
 813                 }
 814                 prev = cur;
 815                 cur = cur->next;
 816         }
 817         ast_log(LOG_DEBUG, "Stopping retransmission on '%s' of %s %d: %s\n", p->callid, resp ? "Response" : "Request", seqno, res ? "Not Found" : "Found");
 818         return res;
 819 }
 820
 821 /* Pretend to ack all packets */
 822 static int __sip_pretend_ack(struct sip_pvt *p)
 823 {
 824         while(p->packets) {
 825                 __sip_ack(p, p->packets->seqno, (p->packets->flags & FLAG_RESPONSE), p->packets->data);
 826         }
 827         return 0;
 828 }
 829
 830 /*--- __sip_semi_ack: Acks receipt of packet, keep it around (used for provisional responses) ---*/
 831 static int __sip_semi_ack(struct sip_pvt *p, int seqno, int resp, const char *msg)
 832 {
 833         struct sip_pkt *cur;
 834         int res = -1;
 835         cur = p->packets;
 836         while(cur) {
 837                 if ((cur->seqno == seqno) && ((cur->flags & FLAG_RESPONSE) == resp) &&
 838                         ((cur->flags & FLAG_RESPONSE) ||
 839                          (!strncasecmp(msg, cur->data, strlen(msg)) && (cur->data[strlen(msg)] < 33)))) {
 840                         /* this is our baby */
 841                         if (cur->retransid > -1)
 842                                 ast_sched_del(sched, cur->retransid);
 843                         cur->retransid = -1;
 844                         res = 0;
 845                         break;
 846                 }
 847                 cur = cur->next;
 848         }
 849         ast_log(LOG_DEBUG, "(Provisional) Stopping retransmission (but retaining packet) on '%s' %s %d: %s\n", p->callid, resp ? "Response" : "Request", seqno, res ? "Not Found" : "Found");
 850         return res;
 851 }
 852
 853 static void parse(struct sip_request *req);
 854 static char *get_header(struct sip_request *req, char *name);
 855 static void copy_request(struct sip_request *dst,struct sip_request *src);
 856
 857 static void parse_copy(struct sip_request *dst, struct sip_request *src)
 858 {
 859         memset(dst, 0, sizeof(*dst));
 860         memcpy(dst->data, src->data, sizeof(dst->data));
 861         dst->len = src->len;
 862         parse(dst);
 863 }
 864 /*--- send_response: Transmit response on SIP request---*/
 865 static int send_response(struct sip_pvt *p, struct sip_request *req, int reliable, int seqno)
 866 {
 867         int res;
 868         char iabuf[INET_ADDRSTRLEN];
 869         struct sip_request tmp;
 870         char tmpmsg[80];
 871         if (sip_debug_test_pvt(p)) {
 872                 if (p->nat & SIP_NAT_ROUTE)
 873                         ast_verbose("%sTransmitting (NAT):\n%s\n to %s:%d\n", reliable ? "Reliably " : "", req->data, ast_inet_ntoa(iabuf, sizeof(iabuf), p->recv.sin_addr), ntohs(p->recv.sin_port));
 874                 else
 875                         ast_verbose("%sTransmitting (no NAT):\n%s\n to %s:%d\n", reliable ? "Reliably " : "", req->data, ast_inet_ntoa(iabuf, sizeof(iabuf), p->sa.sin_addr), ntohs(p->sa.sin_port));
 876         }
 877         if (reliable) {
 878                 if (recordhistory) {
 879                         parse_copy(&tmp, req);
 880                         snprintf(tmpmsg, sizeof(tmpmsg), "%s / %s", tmp.data, get_header(&tmp, "CSeq"));
 881                         append_history(p, "TxRespRel", tmpmsg);
 882                 }
 883                 res = __sip_reliable_xmit(p, seqno, 1, req->data, req->len, (reliable > 1));
 884         } else {
 885                 if (recordhistory) {
 886                         parse_copy(&tmp, req);
 887                         snprintf(tmpmsg, sizeof(tmpmsg), "%s / %s", tmp.data, get_header(&tmp, "CSeq"));
 888                         append_history(p, "TxResp", tmpmsg);
 889                 }
 890                 res = __sip_xmit(p, req->data, req->len);
 891         }
 892         if (res > 0)
 893                 res = 0;
 894         return res;
 895 }
 896
 897 /*--- send_request: Send SIP Request to the other part of the dialogue ---*/
 898 static int send_request(struct sip_pvt *p, struct sip_request *req, int reliable, int seqno)
 899 {
 900         int res;
 901         char iabuf[INET_ADDRSTRLEN];
 902         struct sip_request tmp;
 903         char tmpmsg[80];
 904         if (sip_debug_test_pvt(p)) {
 905                 if (p->nat & SIP_NAT_ROUTE)
 906                         ast_verbose("%sTransmitting:\n%s (NAT) to %s:%d\n", reliable ? "Reliably " : "", req->data, ast_inet_ntoa(iabuf, sizeof(iabuf), p->recv.sin_addr), ntohs(p->recv.sin_port));
 907                 else
 908                         ast_verbose("%sTransmitting:\n%s (no NAT) to %s:%d\n", reliable ? "Reliably " : "", req->data, ast_inet_ntoa(iabuf, sizeof(iabuf), p->sa.sin_addr), ntohs(p->sa.sin_port));
 909         }
 910         if (reliable) {
 911                 if (recordhistory) {
 912                         parse_copy(&tmp, req);
 913                         snprintf(tmpmsg, sizeof(tmpmsg), "%s / %s", tmp.data, get_header(&tmp, "CSeq"));
 914                         append_history(p, "TxReqRel", tmpmsg);
 915                 }
 916                 res = __sip_reliable_xmit(p, seqno, 0, req->data, req->len, (reliable > 1));
 917         } else {
 918                 if (recordhistory) {
 919                         parse_copy(&tmp, req);
 920                         snprintf(tmpmsg, sizeof(tmpmsg), "%s / %s", tmp.data, get_header(&tmp, "CSeq"));
 921                         append_history(p, "TxReq", tmpmsg);
 922                 }
 923                 res = __sip_xmit(p, req->data, req->len);
 924         }
 925         return res;
 926 }
 927
 928 /*--- url_decode: Decode SIP URL  ---*/
 929 static void url_decode(char *s)
 930 {
 931         char *o = s;
 932         unsigned int tmp;
 933         while(*s) {
 934                 switch(*s) {
 935                 case '%':
 936                         if (strlen(s) > 2) {
 937                                 if (sscanf(s + 1, "%2x", &tmp) == 1) {
 938                                         *o = tmp;
 939                                         s += 2; /* Will be incremented once more when we break out */
 940                                         break;
 941                                 }
 942                         }
 943                         /* Fall through if something wasn't right with the formatting */
 944                 default:
 945                         *o = *s;
 946                 }
 947                 s++;
 948                 o++;
 949         }
 950         *o = '\0';
 951 }
 952
 953 /*--- ditch_braces: Pick out text in braces from character string  ---*/
 954 static char *ditch_braces(char *tmp)
 955 {
 956         char *c = tmp;
 957         char *n;
 958         char *q;
 959         if ((q = strchr(tmp, '"')) ) {
 960                 c = q + 1;
 961                 if ((q = strchr(c, '"')) )
 962                         c = q + 1;
 963                 else {
 964                         ast_log(LOG_WARNING, "No closing quote in '%s'\n", tmp);
 965                         c = tmp;
 966                 }
 967         }
 968         if ((n = strchr(c, '<')) ) {
 969                 c = n + 1;
 970                 while(*c && *c != '>') c++;
 971                 if (*c != '>') {
 972                         ast_log(LOG_WARNING, "No closing brace in '%s'\n", tmp);
 973                 } else {
 974                         *c = '\0';
 975                 }
 976                 return n+1;
 977         }
 978         return c;
 979 }
 980
 981 /*--- sip_sendtext: Send SIP MESSAGE text within a call ---*/
 982 /*      Called from PBX core text message functions */
 983 static int sip_sendtext(struct ast_channel *ast, char *text)
 984 {
 985         struct sip_pvt *p = ast->pvt->pvt;
 986         int debug=sip_debug_test_pvt(p);
 987
 988         if (debug)
 989                 ast_verbose("Sending text %s on %s\n", text, ast->name);
 990         if (!p)
 991                 return -1;
 992         if (!text || ast_strlen_zero(text))
 993                 return 0;
 994         if (debug)
 995                 ast_verbose("Really sending text %s on %s\n", text, ast->name);
 996         transmit_message_with_text(p, text);
 997         return 0;
 998 }
 999
1000 static void realtime_update_peer(const char *peername, struct sockaddr_in *sin, const char *username, int expirey)
1001 {
1002         char port[10];
1003         char ipaddr[20];
1004         char regseconds[20];
1005         time_t nowtime;
1006
1007         time(&nowtime);
1008         nowtime += expirey;
1009         snprintf(regseconds, sizeof(regseconds), "%ld", nowtime);
1010         ast_inet_ntoa(ipaddr, sizeof(ipaddr), sin->sin_addr);
1011         snprintf(port, sizeof(port), "%d", ntohs(sin->sin_port));
1012         ast_update_realtime("sipfriends", "name", peername, "ipaddr", ipaddr, "port", port, "regseconds", regseconds, "username", username, NULL);
1013 }
1014
1015 static void register_peer_exten(struct sip_peer *peer, int onoff)
1016 {
1017         unsigned char multi[256]="";
1018         char *stringp, *ext;
1019         if (!ast_strlen_zero(regcontext)) {
1020                 strncpy(multi, ast_strlen_zero(peer->regexten) ? peer->name : peer->regexten, sizeof(multi) - 1);
1021                 stringp = multi;
1022                 while((ext = strsep(&stringp, "&"))) {
1023                         if (onoff)
1024                                 ast_add_extension(regcontext, 1, ext, 1, NULL, NULL, "Noop", strdup(peer->name), free, type);
1025                         else
1026                                 ast_context_remove_extension(regcontext, ext, 1, NULL);
1027                 }
1028         }
1029 }
1030
1031 static void destroy_peer(struct sip_peer *peer)
1032 {
1033         /* Delete it, it needs to disappear */
1034         if (peer->call)
1035                 sip_destroy(peer->call);
1036         if (peer->expire > -1)
1037                 ast_sched_del(sched, peer->expire);
1038         if (peer->pokeexpire > -1)
1039                 ast_sched_del(sched, peer->pokeexpire);
1040         register_peer_exten(peer, 0);
1041         ast_free_ha(peer->ha);
1042         free(peer);
1043 }
1044
1045 /*--- update_peer: Update peer data in database (if used) ---*/
1046 static void update_peer(struct sip_peer *p, int expiry)
1047 {
1048         if (p->temponly)
1049                 realtime_update_peer(p->name, &p->addr, p->username, expiry);
1050 }
1051
1052 static struct sip_peer *build_peer(const char *name, struct ast_variable *v, int temponly);
1053
1054 static struct sip_peer *realtime_peer(const char *peername, struct sockaddr_in *sin)
1055 {
1056         struct ast_variable *var, *tmp=NULL;
1057         char iabuf[80];
1058         struct sip_peer *peer=NULL;
1059         time_t nowtime, regseconds;
1060         int dynamic=0;
1061
1062         if (sin)
1063                 ast_inet_ntoa(iabuf, sizeof(iabuf), sin->sin_addr);
1064         if (peername)
1065                 var = ast_load_realtime("sipfriends", "name", peername, NULL);
1066         else
1067                 var = ast_load_realtime("sipfriends", "ipaddr", iabuf, NULL);
1068         if (var) {
1069                 /* Make sure it's not a user only... */
1070                 peer = build_peer(peername, var, 1);
1071                 if (peer) {
1072                         /* Add some finishing touches, addresses, etc */
1073                         peer->temponly = 1;
1074                         tmp = var;
1075                         while(tmp) {
1076                                 if (!strcasecmp(tmp->name, "type")) {
1077                                         if (strcasecmp(tmp->value, "friend") &&
1078                                                 strcasecmp(tmp->value, "peer")) {
1079                                                 /* Whoops, we weren't supposed to exist! */
1080                                                 destroy_peer(peer);
1081                                                 peer = NULL;
1082                                                 break;
1083                                         }
1084                                 } else if (!strcasecmp(tmp->name, "regseconds")) {
1085                                         if (sscanf(tmp->value, "%li", &regseconds) != 1)
1086                                                 regseconds = 0;
1087                                 } else if (!strcasecmp(tmp->name, "ipaddr")) {
1088                                         inet_aton(tmp->value, &(peer->addr.sin_addr));
1089                                 } else if (!strcasecmp(tmp->name, "port")) {
1090                                         peer->addr.sin_port = htons(atoi(tmp->value));
1091                                 } else if (!strcasecmp(tmp->name, "host")) {
1092                                         if (!strcasecmp(tmp->value, "dynamic"))
1093                                                 dynamic = 1;
1094                                 }
1095                                 tmp = tmp->next;
1096                         }
1097                         if (peer && dynamic) {
1098                                 time(&nowtime);
1099                                 if ((nowtime - regseconds) > 0) {
1100                                         memset(&peer->addr, 0, sizeof(peer->addr));
1101                                         if (option_debug)
1102                                                 ast_log(LOG_DEBUG, "Bah, we're expired (%ld/%ld/%ld)!\n", nowtime - regseconds, regseconds, nowtime);
1103                                 }
1104                         }
1105                 }
1106                 ast_destroy_realtime(var);
1107         }
1108         return peer;
1109 }
1110
1111 /*--- find_peer: Locate peer by name or ip address */
1112 static struct sip_peer *find_peer(const char *peer, struct sockaddr_in *sin)
1113 {
1114         struct sip_peer *p = NULL;
1115
1116         p = peerl.peers;
1117         if (peer) {
1118                 /* Find by peer name */
1119                 while(p) {
1120                         if (!strcasecmp(p->name, peer)) {
1121                                 break;
1122                         }
1123                         p = p->next;
1124                 }
1125         }
1126         else {
1127                 /* Find by sin */
1128                 while(p) {
1129                         if (!inaddrcmp(&p->addr, sin) ||
1130                                         (p->insecure &&
1131                                         (p->addr.sin_addr.s_addr == sin->sin_addr.s_addr))) {
1132                                 break;
1133                         }
1134                         p = p->next;
1135                 }
1136         }
1137
1138         if (!p) {
1139                 p = realtime_peer(peer, sin);
1140         }
1141
1142         return(p);
1143 }
1144
1145 static void destroy_user(struct sip_user *user)
1146 {
1147         ast_free_ha(user->ha);
1148         free(user);
1149 }
1150
1151 static struct sip_user *build_user(const char *name, struct ast_variable *v);
1152 static struct sip_user *realtime_user(const char *username)
1153 {
1154         struct ast_variable *var;
1155         struct ast_variable *tmp;
1156         struct sip_user *user=NULL;
1157         var = ast_load_realtime("sipfriends", "name", username, NULL);
1158         if (var) {
1159                 /* Make sure it's not a user only... */
1160                 user = build_user(username, var);
1161                 if (user) {
1162                         /* Add some finishing touches, addresses, etc */
1163                         user->temponly = 1;
1164                         tmp = var;
1165                         while(tmp) {
1166                                 if (!strcasecmp(tmp->name, "type")) {
1167                                         if (strcasecmp(tmp->value, "friend") &&
1168                                                 strcasecmp(tmp->value, "user")) {
1169                                                 /* Whoops, we weren't supposed to exist! */
1170                                                 destroy_user(user);
1171                                                 user = NULL;
1172                                                 break;
1173                                         }
1174                                 }
1175                                 tmp = tmp->next;
1176                         }
1177                 }
1178                 ast_destroy_realtime(var);
1179         }
1180         return user;
1181 }
1182
1183 /*--- find_user: Locate user by name */
1184 static struct sip_user *find_user(char *name)
1185 {
1186         struct sip_user *u = NULL;
1187
1188         u = userl.users;
1189         while(u) {
1190                 if (!strcasecmp(u->name, name)) {
1191                         break;
1192                 }
1193                 u = u->next;
1194         }
1195         if (!u) {
1196                 u = realtime_user(name);
1197         }
1198         return(u);
1199 }
1200
1201 /*--- create_addr: create address structure from peer definition ---*/
1202 /*      Or, if peer not found, find it in the global DNS */
1203 /*      returns TRUE on failure, FALSE on success */
1204 static int create_addr(struct sip_pvt *r, char *opeer)
1205 {
1206         struct hostent *hp;
1207         struct ast_hostent ahp;
1208         struct sip_peer *p;
1209         int found=0;
1210         char *port;
1211         char *callhost;
1212         int portno;
1213         char host[256], *hostn;
1214         char peer[256]="";
1215
1216         strncpy(peer, opeer, sizeof(peer) - 1);
1217         port = strchr(peer, ':');
1218         if (port) {
1219                 *port = '\0';
1220                 port++;
1221         }
1222         r->sa.sin_family = AF_INET;
1223         ast_mutex_lock(&peerl.lock);
1224         p = find_peer(peer, NULL);
1225
1226         if (p) {
1227                         found++;
1228                         r->capability = p->capability;
1229                         r->nat = p->nat;
1230                         if (r->rtp) {
1231                                 ast_log(LOG_DEBUG, "Setting NAT on RTP to %d\n", (r->nat & SIP_NAT_ROUTE));
1232                                 ast_rtp_setnat(r->rtp, (r->nat & SIP_NAT_ROUTE));
1233                         }
1234                         if (r->vrtp) {
1235                                 ast_log(LOG_DEBUG, "Setting NAT on VRTP to %d\n", (r->nat & SIP_NAT_ROUTE));
1236                                 ast_rtp_setnat(r->vrtp, (r->nat & SIP_NAT_ROUTE));
1237                         }
1238                         strncpy(r->peername, p->username, sizeof(r->peername)-1);
1239                         strncpy(r->authname, p->username, sizeof(r->authname)-1);
1240                         strncpy(r->peersecret, p->secret, sizeof(r->peersecret)-1);
1241                         strncpy(r->peermd5secret, p->md5secret, sizeof(r->peermd5secret)-1);
1242                         strncpy(r->username, p->username, sizeof(r->username)-1);
1243                         strncpy(r->tohost, p->tohost, sizeof(r->tohost)-1);
1244                         strncpy(r->fullcontact, p->fullcontact, sizeof(r->fullcontact)-1);
1245                         if (!r->initreq.headers && !ast_strlen_zero(p->fromdomain)) {
1246                                 if ((callhost = strchr(r->callid, '@'))) {
1247                                         strncpy(callhost + 1, p->fromdomain, sizeof(r->callid) - (callhost - r->callid) - 2);
1248                                 }
1249                         }
1250                         if (ast_strlen_zero(r->tohost)) {
1251                                 if (p->addr.sin_addr.s_addr)
1252                                         ast_inet_ntoa(r->tohost, sizeof(r->tohost), p->addr.sin_addr);
1253                                 else
1254                                         ast_inet_ntoa(r->tohost, sizeof(r->tohost), p->defaddr.sin_addr);
1255                         }
1256                         if (!ast_strlen_zero(p->fromdomain))
1257                                 strncpy(r->fromdomain, p->fromdomain, sizeof(r->fromdomain)-1);
1258                         if (!ast_strlen_zero(p->fromuser))
1259                                 strncpy(r->fromuser, p->fromuser, sizeof(r->fromuser)-1);
1260                         r->insecure = p->insecure;
1261                         r->canreinvite = p->canreinvite;
1262                         r->maxtime = p->maxms;
1263                         r->callgroup = p->callgroup;
1264                         r->pickupgroup = p->pickupgroup;
1265                         if (p->dtmfmode) {
1266                                 r->dtmfmode = p->dtmfmode;
1267                                 if (r->dtmfmode & SIP_DTMF_RFC2833)
1268                                         r->noncodeccapability |= AST_RTP_DTMF;
1269                                 else
1270                                         r->noncodeccapability &= ~AST_RTP_DTMF;
1271                         }
1272                         r->promiscredir = p->promiscredir;
1273                         strncpy(r->context, p->context,sizeof(r->context)-1);
1274                         if ((p->addr.sin_addr.s_addr || p->defaddr.sin_addr.s_addr) &&
1275                                 (!p->maxms || ((p->lastms > 0)  && (p->lastms <= p->maxms)))) {
1276                                 if (p->addr.sin_addr.s_addr) {
1277                                         r->sa.sin_addr = p->addr.sin_addr;
1278                                         r->sa.sin_port = p->addr.sin_port;
1279                                 } else {
1280                                         r->sa.sin_addr = p->defaddr.sin_addr;
1281                                         r->sa.sin_port = p->defaddr.sin_port;
1282                                 }
1283                                 memcpy(&r->recv, &r->sa, sizeof(r->recv));
1284                         } else {
1285                                 if (p->temponly) {
1286                                         destroy_peer(p);
1287                                 }
1288                                 p = NULL;
1289                         }
1290         }
1291         ast_mutex_unlock(&peerl.lock);
1292         if (!p && !found) {
1293                 hostn = peer;
1294                 if (port)
1295                         portno = atoi(port);
1296                 else
1297                         portno = DEFAULT_SIP_PORT;
1298                 if (srvlookup) {
1299                         char service[256];
1300                         int tportno;
1301                         int ret;
1302                         snprintf(service, sizeof(service), "_sip._udp.%s", peer);
1303                         ret = ast_get_srv(NULL, host, sizeof(host), &tportno, service);
1304                         if (ret > 0) {
1305                                 hostn = host;
1306                                 portno = tportno;
1307                         }
1308                 }
1309                 hp = ast_gethostbyname(hostn, &ahp);
1310                 if (hp) {
1311                         strncpy(r->tohost, peer, sizeof(r->tohost) - 1);
1312                         memcpy(&r->sa.sin_addr, hp->h_addr, sizeof(r->sa.sin_addr));
1313                         r->sa.sin_port = htons(portno);
1314                         memcpy(&r->recv, &r->sa, sizeof(r->recv));
1315                         return 0;
1316                 } else {
1317                         ast_log(LOG_WARNING, "No such host: %s\n", peer);
1318                         return -1;
1319                 }
1320         } else if (!p)
1321                 return -1;
1322         else {
1323                 if (p->temponly) {
1324                         destroy_peer(p);
1325                 }
1326                 return 0;
1327         }
1328 }
1329
1330 /*--- auto_congest: Scheduled congestion on a call ---*/
1331 static int auto_congest(void *nothing)
1332 {
1333         struct sip_pvt *p = nothing;
1334         ast_mutex_lock(&p->lock);
1335         p->initid = -1;
1336         if (p->owner) {
1337                 if (!ast_mutex_trylock(&p->owner->lock)) {
1338                         ast_log(LOG_NOTICE, "Auto-congesting %s\n", p->owner->name);
1339                         ast_queue_control(p->owner, AST_CONTROL_CONGESTION);
1340                         ast_mutex_unlock(&p->owner->lock);
1341                 }
1342         }
1343         ast_mutex_unlock(&p->lock);
1344         return 0;
1345 }
1346
1347 /*--- sip_prefs_free: Free codec list in preference structure ---*/
1348 static void sip_prefs_free(void)
1349 {
1350         struct sip_codec_pref *cur, *next;
1351         cur = prefs;
1352         while(cur) {
1353                 next = cur->next;
1354                 free(cur);
1355                 cur = next;
1356         }
1357         prefs = NULL;
1358 }
1359
1360 /*--- sip_pref_remove: Remove codec from pref list ---*/
1361 static void sip_pref_remove(int format)
1362 {
1363         struct sip_codec_pref *cur, *prev=NULL;
1364         cur = prefs;
1365         while(cur) {
1366                 if (cur->codec == format) {
1367                         if (prev)
1368                                 prev->next = cur->next;
1369                         else
1370                                 prefs = cur->next;
1371                         free(cur);
1372                         return;
1373                 }
1374                 prev = cur;
1375                 cur = cur->next;
1376         }
1377 }
1378
1379 /*--- sip_pref_append: Append codec to list ---*/
1380 static int sip_pref_append(int format)
1381 {
1382         struct sip_codec_pref *cur, *tmp;
1383         sip_pref_remove(format);
1384         tmp = (struct sip_codec_pref *)malloc(sizeof(struct sip_codec_pref));
1385         if (!tmp)
1386                 return -1;
1387         memset(tmp, 0, sizeof(struct sip_codec_pref));
1388         tmp->codec = format;
1389         if (prefs) {
1390                 cur = prefs;
1391                 while(cur->next)
1392                         cur = cur->next;
1393                 cur->next = tmp;
1394         } else
1395                 prefs = tmp;
1396         return 0;
1397 }
1398
1399 /*--- sip_codec_choose: Pick a codec ---*/
1400 static int sip_codec_choose(int formats)
1401 {
1402         struct sip_codec_pref *cur;
1403         formats &= ((AST_FORMAT_MAX_AUDIO << 1) - 1);
1404         cur = prefs;
1405         while(cur) {
1406                 if (formats & cur->codec)
1407                         return cur->codec;
1408                 cur = cur->next;
1409         }
1410         return ast_best_codec(formats);
1411 }
1412
1413 /*--- sip_call: Initiate SIP call from PBX ---*/
1414 /*      used from the dial() application      */
1415 static int sip_call(struct ast_channel *ast, char *dest, int timeout)
1416 {
1417         int res;
1418         struct sip_pvt *p;
1419         char *vxml_url = NULL;
1420         char *distinctive_ring = NULL;
1421         char *osptoken = NULL;
1422 #ifdef OSP_SUPPORT
1423         char *osphandle = NULL;
1424 #endif
1425         struct varshead *headp;
1426         struct ast_var_t *current;
1427
1428         p = ast->pvt->pvt;
1429         if ((ast->_state != AST_STATE_DOWN) && (ast->_state != AST_STATE_RESERVED)) {
1430                 ast_log(LOG_WARNING, "sip_call called on %s, neither down nor reserved\n", ast->name);
1431                 return -1;
1432         }
1433         /* Check whether there is vxml_url, distinctive ring variables */
1434
1435         headp=&ast->varshead;
1436         AST_LIST_TRAVERSE(headp,current,entries) {
1437                 /* Check whether there is a VXML_URL variable */
1438                 if (!vxml_url && !strcasecmp(ast_var_name(current),"VXML_URL")) {
1439                         vxml_url = ast_var_value(current);
1440                 } else if (!distinctive_ring && !strcasecmp(ast_var_name(current),"ALERT_INFO")) {
1441                         /* Check whether there is a ALERT_INFO variable */
1442                         distinctive_ring = ast_var_value(current);
1443                 }
1444 #ifdef OSP_SUPPORT
1445                   else if (!osptoken && !strcasecmp(ast_var_name(current), "OSPTOKEN")) {
1446                         osptoken = ast_var_value(current);
1447                 } else if (!osphandle && !strcasecmp(ast_var_name(current), "OSPHANDLE")) {
1448                         osphandle = ast_var_value(current);
1449                 }
1450 #endif
1451         }
1452
1453         res = 0;
1454         p->outgoing = 1;
1455 #ifdef OSP_SUPPORT
1456         if (!osptoken || !osphandle || (sscanf(osphandle, "%i", &p->osphandle) != 1)) {
1457                 /* Force Disable OSP support */
1458                 osptoken = NULL;
1459                 osphandle = NULL;
1460                 p->osphandle = -1;
1461         }
1462 #endif
1463         ast_log(LOG_DEBUG, "Outgoing Call for %s\n", p->username);
1464         res = update_user_counter(p,INC_OUT_USE);
1465         if ( res != -1 ) {
1466                 p->callingpres = ast->cid.cid_pres;
1467                 p->jointcapability = p->capability;
1468                 transmit_invite(p, "INVITE", 1, NULL, NULL, vxml_url,distinctive_ring, osptoken, 1);
1469                 if (p->maxtime) {
1470                         /* Initialize auto-congest time */
1471                         p->initid = ast_sched_add(sched, p->maxtime * 4, auto_congest, p);
1472                 }
1473         }
1474         return res;
1475 }
1476
1477 /*---  __sip_destroy: Execute destrucion of call structure, release memory---*/
1478 static void __sip_destroy(struct sip_pvt *p, int lockowner)
1479 {
1480         struct sip_pvt *cur, *prev = NULL;
1481         struct sip_pkt *cp;
1482         struct sip_history *hist;
1483
1484         if (sip_debug_test_pvt(p))
1485                 ast_verbose("Destroying call '%s'\n", p->callid);
1486         if (p->stateid > -1)
1487                 ast_extension_state_del(p->stateid, NULL);
1488         if (p->initid > -1)
1489                 ast_sched_del(sched, p->initid);
1490         if (p->autokillid > -1)
1491                 ast_sched_del(sched, p->autokillid);
1492
1493         if (p->rtp) {
1494                 ast_rtp_destroy(p->rtp);
1495         }
1496         if (p->vrtp) {
1497                 ast_rtp_destroy(p->vrtp);
1498         }
1499         if (p->route) {
1500                 free_old_route(p->route);
1501                 p->route = NULL;
1502         }
1503         if (p->registry) {
1504                 /* Carefully unlink from registry */
1505                 struct sip_registry *reg;
1506                 ast_mutex_lock(&regl.lock);
1507                 reg = regl.registrations;
1508                 while(reg) {
1509                         if ((reg == p->registry) && (p->registry->call == p))
1510                                 p->registry->call=NULL;
1511                         reg = reg->next;
1512                 }
1513                 ast_mutex_unlock(&regl.lock);
1514         }
1515         /* Unlink us from the owner if we have one */
1516         if (p->owner) {
1517                 if (lockowner)
1518                         ast_mutex_lock(&p->owner->lock);
1519                 ast_log(LOG_DEBUG, "Detaching from %s\n", p->owner->name);
1520                 p->owner->pvt->pvt = NULL;
1521                 if (lockowner)
1522                         ast_mutex_unlock(&p->owner->lock);
1523         }
1524         /* Clear history */
1525         while(p->history) {
1526                 hist = p->history;
1527                 p->history = p->history->next;
1528                 free(hist);
1529         }
1530         cur = iflist;
1531         while(cur) {
1532                 if (cur == p) {
1533                         if (prev)
1534                                 prev->next = cur->next;
1535                         else
1536                                 iflist = cur->next;
1537                         break;
1538                 }
1539                 prev = cur;
1540                 cur = cur->next;
1541         }
1542         if (!cur) {
1543                 ast_log(LOG_WARNING, "%p is not in list?!?! \n", cur);
1544         } else {
1545                 if (p->initid > -1)
1546                         ast_sched_del(sched, p->initid);
1547                 while((cp = p->packets)) {
1548                         p->packets = p->packets->next;
1549                         if (cp->retransid > -1)
1550                                 ast_sched_del(sched, cp->retransid);
1551                         free(cp);
1552                 }
1553                 ast_mutex_destroy(&p->lock);
1554                 free(p);
1555         }
1556 }
1557
1558 /*--- update_user_counter: Handle incominglimit and outgoinglimit for SIP users ---*/
1559 /* Note: This is going to be replaced by app_groupcount */
1560 static int update_user_counter(struct sip_pvt *fup, int event)
1561 {
1562         char name[256] = "";
1563         struct sip_user *u;
1564         strncpy(name, fup->username, sizeof(name) - 1);
1565         ast_mutex_lock(&userl.lock);
1566         u = find_user(name);
1567         if (!u) {
1568                 ast_log(LOG_DEBUG, "%s is not a local user\n", name);
1569                 ast_mutex_unlock(&userl.lock);
1570                 return 0;
1571         }
1572         switch(event) {
1573                 /* incoming and outgoing affects the inUse counter */
1574                 case DEC_OUT_USE:
1575                 case DEC_IN_USE:
1576                         if ( u->inUse > 0 ) {
1577                                 u->inUse--;
1578                         } else {
1579                                 u->inUse = 0;
1580                         }
1581                         break;
1582                 case INC_IN_USE:
1583                 case INC_OUT_USE:
1584                         if (u->incominglimit > 0 ) {
1585                                 if (u->inUse >= u->incominglimit) {
1586                                         ast_log(LOG_ERROR, "Call from user '%s' rejected due to usage limit of %d\n", u->name, u->incominglimit);
1587                                         /* inc inUse as well */
1588                                         if ( event == INC_OUT_USE ) {
1589                                                 u->inUse++;
1590                                         }
1591                                         ast_mutex_unlock(&userl.lock);
1592                                         if (u->temponly) {
1593                                                 destroy_user(u);
1594                                         }
1595                                         return -1;
1596                                 }
1597                         }
1598                         u->inUse++;
1599                         ast_log(LOG_DEBUG, "Call from user '%s' is %d out of %d\n", u->name, u->inUse, u->incominglimit);
1600                         break;
1601                 /* we don't use these anymore
1602                 case DEC_OUT_USE:
1603                         if ( u->outUse > 0 ) {
1604                                 u->outUse--;
1605                         } else {
1606                                 u->outUse = 0;
1607                         }
1608                         break;
1609                 case INC_OUT_USE:
1610                         if ( u->outgoinglimit > 0 ) {
1611                                 if ( u->outUse >= u->outgoinglimit ) {
1612                                         ast_log(LOG_ERROR, "Outgoing call from user '%s' rejected due to usage limit of %d\n", u->name, u->outgoinglimit);
1613                                         ast_mutex_unlock(&userl.lock);
1614                                         if (u->temponly) {
1615                                                 destroy_user(u);
1616                                         }
1617                                         return -1;
1618                                 }
1619                         }
1620                         u->outUse++;
1621                         break;
1622                 */
1623                 default:
1624                         ast_log(LOG_ERROR, "update_user_counter(%s,%d) called with no event!\n",u->name,event);
1625         }
1626         ast_mutex_unlock(&userl.lock);
1627         if (u->temponly) {
1628                 destroy_user(u);
1629         }
1630         return 0;
1631 }
1632
1633 /*--- sip_destroy: Destroy SIP call structure ---*/
1634 static void sip_destroy(struct sip_pvt *p)
1635 {
1636         ast_mutex_lock(&iflock);
1637         __sip_destroy(p, 1);
1638         ast_mutex_unlock(&iflock);
1639 }
1640
1641
1642 static int transmit_response_reliable(struct sip_pvt *p, char *msg, struct sip_request *req, int fatal);
1643
1644 static int hangup_sip2cause(int cause)
1645 {
1646 /* Possible values from causes.h
1647         AST_CAUSE_NOTDEFINED    AST_CAUSE_NORMAL        AST_CAUSE_BUSY
1648         AST_CAUSE_FAILURE       AST_CAUSE_CONGESTION    AST_CAUSE_UNALLOCATED
1649 */
1650
1651         switch(cause) {
1652                 case 404:       /* Not found */
1653                         return AST_CAUSE_UNALLOCATED;
1654                 case 483:       /* Too many hops */
1655                         return AST_CAUSE_FAILURE;
1656                 case 486:
1657                         return AST_CAUSE_BUSY;
1658                 default:
1659                         return AST_CAUSE_NORMAL;
1660         }
1661         /* Never reached */
1662         return 0;
1663 }
1664
1665 static char *hangup_cause2sip(int cause)
1666 {
1667         switch(cause)
1668         {
1669                 case AST_CAUSE_FAILURE:
1670                         return "500 Server internal failure";
1671                 case AST_CAUSE_CONGESTION:
1672                         return "503 Service Unavailable";
1673                 case AST_CAUSE_BUSY:
1674                         return "486 Busy";
1675                 default:
1676                         return NULL;
1677         }
1678         /* Never reached */
1679         return 0;
1680 }
1681
1682 /*--- sip_hangup: Hangup SIP call */
1683 static int sip_hangup(struct ast_channel *ast)
1684 {
1685         struct sip_pvt *p = ast->pvt->pvt;
1686         int needcancel = 0;
1687         int needdestroy = 0;
1688         if (option_debug)
1689                 ast_log(LOG_DEBUG, "sip_hangup(%s)\n", ast->name);
1690         if (!ast->pvt->pvt) {
1691                 ast_log(LOG_DEBUG, "Asked to hangup channel not connected\n");
1692                 return 0;
1693         }
1694         ast_mutex_lock(&p->lock);
1695 #ifdef OSP_SUPPORT
1696         if ((p->osphandle > -1) && (ast->_state == AST_STATE_UP)) {
1697                 ast_osp_terminate(p->osphandle, AST_CAUSE_NORMAL, p->ospstart, time(NULL) - p->ospstart);
1698         }
1699 #endif
1700         if ( p->outgoing ) {
1701                 ast_log(LOG_DEBUG, "update_user_counter(%s) - decrement outUse counter\n", p->username);
1702                 update_user_counter(p, DEC_OUT_USE);
1703         } else {
1704                 ast_log(LOG_DEBUG, "update_user_counter(%s) - decrement inUse counter\n", p->username);
1705                 update_user_counter(p, DEC_IN_USE);
1706         }
1707         /* Determine how to disconnect */
1708         if (p->owner != ast) {
1709                 ast_log(LOG_WARNING, "Huh?  We aren't the owner?\n");
1710                 ast_mutex_unlock(&p->lock);
1711                 return 0;
1712         }
1713         if (!ast || (ast->_state != AST_STATE_UP))
1714                 needcancel = 1;
1715         /* Disconnect */
1716         p = ast->pvt->pvt;
1717         if (p->vad) {
1718             ast_dsp_free(p->vad);
1719         }
1720         p->owner = NULL;
1721         ast->pvt->pvt = NULL;
1722
1723         ast_mutex_lock(&usecnt_lock);
1724         usecnt--;
1725         ast_mutex_unlock(&usecnt_lock);
1726         ast_update_use_count();
1727
1728         needdestroy = 1;
1729         /* Start the process if it's not already started */
1730         if (!p->alreadygone && !ast_strlen_zero(p->initreq.data)) {
1731                 if (needcancel) {
1732                         if (p->outgoing) {
1733                                 transmit_request_with_auth(p, "CANCEL", p->ocseq, 1, 0);
1734                                 /* Actually don't destroy us yet, wait for the 487 on our original
1735                                    INVITE, but do set an autodestruct just in case we never get it. */
1736                                 needdestroy = 0;
1737                                 sip_scheddestroy(p, 15000);
1738                                 if ( p->initid != -1 ) {
1739                                         /* channel still up - reverse dec of inUse counter
1740                                            only if the channel is not auto-congested */
1741                                         if ( p->outgoing ) {
1742                                                 update_user_counter(p, INC_OUT_USE);
1743                                         }
1744                                         else {
1745                                                 update_user_counter(p, INC_IN_USE);
1746                                         }
1747                                 }
1748                         } else {
1749                                 char *res;
1750                                 if (ast->hangupcause && ((res = hangup_cause2sip(ast->hangupcause)))) {
1751                                         transmit_response_reliable(p, res, &p->initreq, 1);
1752                                 } else
1753                                         transmit_response_reliable(p, "403 Forbidden", &p->initreq, 1);
1754                         }
1755                 } else {
1756                         if (!p->pendinginvite) {
1757                                 /* Send a hangup */
1758                                 transmit_request_with_auth(p, "BYE", 0, 1, 1);
1759                         } else {
1760                                 /* Note we will need a BYE when this all settles out
1761                                    but we can't send one while we have "INVITE" outstanding. */
1762                                 p->pendingbye = 1;
1763                                 p->needreinvite = 0;
1764                         }
1765                 }
1766         }
1767         p->needdestroy = needdestroy;
1768         ast_mutex_unlock(&p->lock);
1769         return 0;
1770 }
1771
1772 /*--- sip_answer: Answer SIP call , send 200 OK on Invite */
1773 static int sip_answer(struct ast_channel *ast)
1774 {
1775         int res = 0,fmt;
1776         char *codec;
1777         struct sip_pvt *p = ast->pvt->pvt;
1778
1779         ast_mutex_lock(&p->lock);
1780         if (ast->_state != AST_STATE_UP) {
1781 #ifdef OSP_SUPPORT
1782                 time(&p->ospstart);
1783 #endif
1784
1785                 codec=pbx_builtin_getvar_helper(p->owner,"SIP_CODEC");
1786                 if (codec) {
1787                         fmt=ast_getformatbyname(codec);
1788                         if (fmt) {
1789                                 ast_log(LOG_NOTICE, "Changing codec to '%s' for this call because of ${SIP_CODEC) variable\n",codec);
1790                                 if (p->jointcapability & fmt) {
1791                                         p->jointcapability &= fmt;
1792                                         p->capability &= fmt;
1793                                 } else
1794                                         ast_log(LOG_NOTICE, "Ignoring ${SIP_CODEC} variable because it is not shared by both ends.\n");
1795                         } else ast_log(LOG_NOTICE, "Ignoring ${SIP_CODEC} variable because of unrecognized/not configured codec (check allow/disallow in sip.conf): %s\n",codec);
1796                 }
1797
1798                 ast_setstate(ast, AST_STATE_UP);
1799                 if (option_debug)
1800                         ast_log(LOG_DEBUG, "sip_answer(%s)\n", ast->name);
1801                 res = transmit_response_with_sdp(p, "200 OK", &p->initreq, 1);
1802         }
1803         ast_mutex_unlock(&p->lock);
1804         return res;
1805 }
1806
1807 /*--- sip_write: Send response, support audio media ---*/
1808 static int sip_write(struct ast_channel *ast, struct ast_frame *frame)
1809 {
1810         struct sip_pvt *p = ast->pvt->pvt;
1811         int res = 0;
1812         if (frame->frametype == AST_FRAME_VOICE) {
1813                 if (!(frame->subclass & ast->nativeformats)) {
1814                         ast_log(LOG_WARNING, "Asked to transmit frame type %d, while native formats is %d (read/write = %d/%d)\n",
1815                                 frame->subclass, ast->nativeformats, ast->readformat, ast->writeformat);
1816                         return 0;
1817                 }
1818                 if (p) {
1819                         ast_mutex_lock(&p->lock);
1820                         if (p->rtp) {
1821                                 if ((ast->_state != AST_STATE_UP) && !p->progress && !p->outgoing) {
1822                                         transmit_response_with_sdp(p, "183 Session Progress", &p->initreq, 0);
1823                                         p->progress = 1;
1824                                 }
1825                                 res =  ast_rtp_write(p->rtp, frame);
1826                         }
1827                         ast_mutex_unlock(&p->lock);
1828                 }
1829         } else if (frame->frametype == AST_FRAME_VIDEO) {
1830                 if (p) {
1831                         ast_mutex_lock(&p->lock);
1832                         if (p->vrtp) {
1833                                 if ((ast->_state != AST_STATE_UP) && !p->progress && !p->outgoing) {
1834                                         transmit_response_with_sdp(p, "183 Session Progress", &p->initreq, 0);
1835                                         p->progress = 1;
1836                                 }
1837                                 res =  ast_rtp_write(p->vrtp, frame);
1838                         }
1839                         ast_mutex_unlock(&p->lock);
1840                 }
1841         } else if (frame->frametype == AST_FRAME_IMAGE) {
1842                 return 0;
1843         } else {
1844                 ast_log(LOG_WARNING, "Can't send %d type frames with SIP write\n", frame->frametype);
1845                 return 0;
1846         }
1847
1848         return res;
1849 }
1850
1851 /*--- sip_fixup: Fix up a channel:  If a channel is consumed, this is called.
1852         Basically update any ->owner links ----*/
1853 static int sip_fixup(struct ast_channel *oldchan, struct ast_channel *newchan)
1854 {
1855         struct sip_pvt *p = newchan->pvt->pvt;
1856         ast_mutex_lock(&p->lock);
1857         if (p->owner != oldchan) {
1858                 ast_log(LOG_WARNING, "old channel wasn't %p but was %p\n", oldchan, p->owner);
1859                 ast_mutex_unlock(&p->lock);
1860                 return -1;
1861         }
1862         p->owner = newchan;
1863         ast_mutex_unlock(&p->lock);
1864         return 0;
1865 }
1866
1867 /*--- sip_senddigit: Send DTMF character on SIP channel */
1868 /*    within one call, we're able to transmit in many methods simultaneously */
1869 static int sip_senddigit(struct ast_channel *ast, char digit)
1870 {
1871         struct sip_pvt *p = ast->pvt->pvt;
1872         if (p && (p->dtmfmode & SIP_DTMF_INFO)) {
1873                 transmit_info_with_digit(p, digit);
1874         }
1875         if (p && p->rtp && (p->dtmfmode & SIP_DTMF_RFC2833)) {
1876                 ast_rtp_senddigit(p->rtp, digit);
1877         }
1878         /* If in-band DTMF is desired, send that */
1879         if (p->dtmfmode & SIP_DTMF_INBAND)
1880                 return -1;
1881         return 0;
1882 }
1883
1884
1885 /*--- sip_transfer: Transfer SIP call */
1886 static int sip_transfer(struct ast_channel *ast, char *dest)
1887 {
1888         struct sip_pvt *p = ast->pvt->pvt;
1889         int res;
1890         res = transmit_refer(p, dest);
1891         return res;
1892 }
1893
1894 /*--- sip_indicate: Play indication to user */
1895 /* With SIP a lot of indications is sent as messages, letting the device play
1896    the indication - busy signal, congestion etc */
1897 static int sip_indicate(struct ast_channel *ast, int condition)
1898 {
1899         struct sip_pvt *p = ast->pvt->pvt;
1900         switch(condition) {
1901         case AST_CONTROL_RINGING:
1902                 if (ast->_state == AST_STATE_RING) {
1903                         if (!p->progress) {
1904                                 transmit_response(p, "180 Ringing", &p->initreq);
1905                                 p->ringing = 1;
1906                                 if (!p->progressinband)
1907                                         break;
1908                         } else {
1909                                 /* Oops, we've sent progress tones.  Let Asterisk do it instead */
1910                         }
1911                 }
1912                 return -1;
1913         case AST_CONTROL_BUSY:
1914                 if (ast->_state != AST_STATE_UP) {
1915                         transmit_response(p, "486 Busy Here", &p->initreq);
1916                         p->alreadygone = 1;
1917                         ast_softhangup_nolock(ast, AST_SOFTHANGUP_DEV);
1918                         break;
1919                 }
1920                 return -1;
1921         case AST_CONTROL_CONGESTION:
1922                 if (ast->_state != AST_STATE_UP) {
1923                         transmit_response(p, "503 Service Unavailable", &p->initreq);
1924                         p->alreadygone = 1;
1925                         ast_softhangup_nolock(ast, AST_SOFTHANGUP_DEV);
1926                         break;
1927                 }
1928                 return -1;
1929         case AST_CONTROL_PROGRESS:
1930         case AST_CONTROL_PROCEEDING:
1931                 if ((ast->_state != AST_STATE_UP) && !p->progress && !p->outgoing) {
1932                         transmit_response_with_sdp(p, "183 Session Progress", &p->initreq, 0);
1933                         p->progress = 1;
1934                         break;
1935                 }
1936                 return -1;
1937         case -1:
1938                 return -1;
1939         default:
1940                 ast_log(LOG_WARNING, "Don't know how to indicate condition %d\n", condition);
1941                 return -1;
1942         }
1943         return 0;
1944 }
1945
1946
1947
1948 /*--- sip_new: Initiate a call in the SIP channel */
1949 /*      called from sip_request_call (calls from the pbx ) */
1950 static struct ast_channel *sip_new(struct sip_pvt *i, int state, char *title)
1951 {
1952         struct ast_channel *tmp;
1953         int fmt;
1954
1955         ast_mutex_unlock(&i->lock);
1956         /* Don't hold a sip pvt lock while we allocate a channel */
1957         tmp = ast_channel_alloc(1);
1958         ast_mutex_lock(&i->lock);
1959         if (tmp) {
1960                 /* Select our native format based on codec preference until we receive
1961                    something from another device to the contrary. */
1962                 if (i->jointcapability)
1963                         tmp->nativeformats = sip_codec_choose(i->jointcapability);
1964                 else if (i->capability)
1965                         tmp->nativeformats = sip_codec_choose(i->capability);
1966                 else
1967                         tmp->nativeformats = sip_codec_choose(global_capability);
1968                 fmt = ast_best_codec(tmp->nativeformats);
1969                 if (title)
1970                         snprintf(tmp->name, sizeof(tmp->name), "SIP/%s-%04x", title, rand() & 0xffff);
1971                 else
1972                         if (strchr(i->fromdomain,':'))
1973                         {
1974                                 snprintf(tmp->name, sizeof(tmp->name), "SIP/%s-%08x", strchr(i->fromdomain,':')+1, (int)(long)(i));
1975                         }
1976                         else
1977                         {
1978                                 snprintf(tmp->name, sizeof(tmp->name), "SIP/%s-%08x", i->fromdomain, (int)(long)(i));
1979                         }
1980                 tmp->type = type;
1981                 if (i->dtmfmode & SIP_DTMF_INBAND) {
1982                     i->vad = ast_dsp_new();
1983                     ast_dsp_set_features(i->vad, DSP_FEATURE_DTMF_DETECT);
1984                     if (relaxdtmf)
1985                         ast_dsp_digitmode(i->vad, DSP_DIGITMODE_DTMF | DSP_DIGITMODE_RELAXDTMF);
1986                 }
1987                 tmp->fds[0] = ast_rtp_fd(i->rtp);
1988                 tmp->fds[1] = ast_rtcp_fd(i->rtp);
1989                 if (i->vrtp) {
1990                         tmp->fds[2] = ast_rtp_fd(i->vrtp);
1991                         tmp->fds[3] = ast_rtcp_fd(i->vrtp);
1992                 }
1993                 if (state == AST_STATE_RING)
1994                         tmp->rings = 1;
1995                 tmp->adsicpe = AST_ADSI_UNAVAILABLE;
1996                 tmp->writeformat = fmt;
1997                 tmp->pvt->rawwriteformat = fmt;
1998                 tmp->readformat = fmt;
1999                 tmp->pvt->rawreadformat = fmt;
2000                 tmp->pvt->pvt = i;
2001                 tmp->pvt->send_text = sip_sendtext;
2002                 tmp->pvt->call = sip_call;
2003                 tmp->pvt->hangup = sip_hangup;
2004                 tmp->pvt->answer = sip_answer;
2005                 tmp->pvt->read = sip_read;
2006                 tmp->pvt->write = sip_write;
2007                 tmp->pvt->write_video = sip_write;
2008                 tmp->pvt->indicate = sip_indicate;
2009                 tmp->pvt->transfer = sip_transfer;
2010                 tmp->pvt->fixup = sip_fixup;
2011                 tmp->pvt->send_digit = sip_senddigit;
2012
2013                 tmp->pvt->bridge = ast_rtp_bridge;
2014
2015                 tmp->callgroup = i->callgroup;
2016                 tmp->pickupgroup = i->pickupgroup;
2017                 tmp->cid.cid_pres = i->callingpres;
2018                 if (!ast_strlen_zero(i->accountcode))
2019                         strncpy(tmp->accountcode, i->accountcode, sizeof(tmp->accountcode)-1);
2020                 if (i->amaflags)
2021                         tmp->amaflags = i->amaflags;
2022                 if (!ast_strlen_zero(i->language))
2023                         strncpy(tmp->language, i->language, sizeof(tmp->language)-1);
2024                 if (!ast_strlen_zero(i->musicclass))
2025                         strncpy(tmp->musicclass, i->musicclass, sizeof(tmp->musicclass)-1);
2026                 i->owner = tmp;
2027                 ast_mutex_lock(&usecnt_lock);
2028                 usecnt++;
2029                 ast_mutex_unlock(&usecnt_lock);
2030                 strncpy(tmp->context, i->context, sizeof(tmp->context)-1);
2031                 strncpy(tmp->exten, i->exten, sizeof(tmp->exten)-1);
2032                 if (!ast_strlen_zero(i->cid_num))
2033                         tmp->cid.cid_num = strdup(i->cid_num);
2034                 if (!ast_strlen_zero(i->cid_name))
2035                         tmp->cid.cid_name = strdup(i->cid_name);
2036                 if (!ast_strlen_zero(i->rdnis))
2037                         tmp->cid.cid_rdnis = strdup(i->rdnis);
2038                 if (!ast_strlen_zero(i->exten) && strcmp(i->exten, "s"))
2039                         tmp->cid.cid_dnid = strdup(i->exten);
2040                 tmp->priority = 1;
2041                 if (!ast_strlen_zero(i->domain)) {
2042                         pbx_builtin_setvar_helper(tmp, "SIPDOMAIN", i->domain);
2043                 }
2044                 if (!ast_strlen_zero(i->useragent)) {
2045                         pbx_builtin_setvar_helper(tmp, "SIPUSERAGENT", i->useragent);
2046                 }
2047                 if (!ast_strlen_zero(i->callid)) {
2048                         pbx_builtin_setvar_helper(tmp, "SIPCALLID", i->callid);
2049                 }
2050                 ast_setstate(tmp, state);
2051                 if (state != AST_STATE_DOWN) {
2052                         if (ast_pbx_start(tmp)) {
2053                                 ast_log(LOG_WARNING, "Unable to start PBX on %s\n", tmp->name);
2054                                 ast_hangup(tmp);
2055                                 tmp = NULL;
2056                         }
2057                 }
2058         } else
2059                 ast_log(LOG_WARNING, "Unable to allocate channel structure\n");
2060         return tmp;
2061 }
2062
2063 static struct cfalias {
2064         char *fullname;
2065         char *shortname;
2066 } aliases[] = {
2067         { "Content-Type", "c" },
2068         { "Content-Encoding", "e" },
2069         { "From", "f" },
2070         { "Call-ID", "i" },
2071         { "Contact", "m" },
2072         { "Content-Length", "l" },
2073         { "Subject", "s" },
2074         { "To", "t" },
2075         { "Supported", "k" },
2076         { "Refer-To", "r" },
2077         { "Allow-Events", "u" },
2078         { "Event", "o" },
2079         { "Via", "v" },
2080 };
2081
2082 /*--- get_sdp_by_line: Reads one line of SIP message body */
2083 static char* get_sdp_by_line(char* line, char *name, int nameLen) {
2084   if (strncasecmp(line, name, nameLen) == 0 && line[nameLen] == '=') {
2085     char* r = line + nameLen + 1;
2086     while (*r && (*r < 33)) ++r;
2087     return r;
2088   }
2089
2090   return "";
2091 }
2092
2093 /*--- get_sdp: Gets all kind of SIP message bodies, including SDP,
2094    but the name wrongly applies _only_ sdp */
2095 static char *get_sdp(struct sip_request *req, char *name) {
2096   int x;
2097   int len = strlen(name);
2098   char *r;
2099
2100   for (x=0; x<req->lines; x++) {
2101     r = get_sdp_by_line(req->line[x], name, len);
2102     if (r[0] != '\0') return r;
2103   }
2104   return "";
2105 }
2106
2107
2108 static void sdpLineNum_iterator_init(int* iterator) {
2109   *iterator = 0;
2110 }
2111
2112 static char* get_sdp_iterate(int* iterator,
2113                              struct sip_request *req, char *name) {
2114   int len = strlen(name);
2115   char *r;
2116   while (*iterator < req->lines) {
2117     r = get_sdp_by_line(req->line[(*iterator)++], name, len);
2118     if (r[0] != '\0') return r;
2119   }
2120   return "";
2121 }
2122
2123 static char *__get_header(struct sip_request *req, char *name, int *start)
2124 {
2125         int x;
2126         int len = strlen(name);
2127         char *r;
2128         if (pedanticsipchecking) {
2129                 /* Technically you can place arbitrary whitespace both before and after the ':' in
2130                    a header, although RFC3261 clearly says you shouldn't before, and place just
2131                    one afterwards.  If you shouldn't do it, what absolute idiot decided it was
2132                    a good idea to say you can do it, and if you can do it, why in the hell would
2133                    you say you shouldn't.  */
2134                 for (x=*start;x<req->headers;x++) {
2135                         if (!strncasecmp(req->header[x], name, len)) {
2136                                 r = req->header[x] + len;
2137                                 while(*r && (*r < 33))
2138                                         r++;
2139                                 if (*r == ':') {
2140                                         r++ ;
2141                                         while(*r && (*r < 33))
2142                                                 r++;
2143                                         *start = x+1;
2144                                         return r;
2145                                 }
2146                         }
2147                 }
2148         } else {
2149                 /* We probably shouldn't even bother counting whitespace afterwards but
2150                    I guess for backwards compatibility we will */
2151                 for (x=*start;x<req->headers;x++) {
2152                         if (!strncasecmp(req->header[x], name, len) &&
2153                                         (req->header[x][len] == ':')) {
2154                                                 r = req->header[x] + len + 1;
2155                                                 while(*r && (*r < 33))
2156                                                                 r++;
2157                                                 *start = x+1;
2158                                                 return r;
2159                         }
2160                 }
2161         }
2162         /* Try aliases */
2163         for (x=0;x<sizeof(aliases) / sizeof(aliases[0]); x++)
2164                 if (!strcasecmp(aliases[x].fullname, name))
2165                         return __get_header(req, aliases[x].shortname, start);
2166
2167         /* Don't return NULL, so get_header is always a valid pointer */
2168         return "";
2169 }
2170
2171 /*--- get_header: Get header from SIP request ---*/
2172 static char *get_header(struct sip_request *req, char *name)
2173 {
2174         int start = 0;
2175         return __get_header(req, name, &start);
2176 }
2177
2178 /*--- sip_rtp_read: Read RTP from network ---*/
2179 static struct ast_frame *sip_rtp_read(struct ast_channel *ast, struct sip_pvt *p)
2180 {
2181         /* Retrieve audio/etc from channel.  Assumes p->lock is already held. */
2182         struct ast_frame *f;
2183         static struct ast_frame null_frame = { AST_FRAME_NULL, };
2184         switch(ast->fdno) {
2185         case 0:
2186                 f = ast_rtp_read(p->rtp);       /* RTP Audio */
2187                 break;
2188         case 1:
2189                 f = ast_rtcp_read(p->rtp);      /* RTCP Control Channel */
2190                 break;
2191         case 2:
2192                 f = ast_rtp_read(p->vrtp);      /* RTP Video */
2193                 break;
2194         case 3:
2195                 f = ast_rtcp_read(p->vrtp);     /* RTCP Control Channel for video */
2196                 break;
2197         default:
2198                 f = &null_frame;
2199         }
2200         /* Don't send RFC2833 if we're not supposed to */
2201         if (f && (f->frametype == AST_FRAME_DTMF) && !(p->dtmfmode & SIP_DTMF_RFC2833))
2202                 return &null_frame;
2203         if (p->owner) {
2204                 /* We already hold the channel lock */
2205                 if (f->frametype == AST_FRAME_VOICE) {
2206                         if (f->subclass != p->owner->nativeformats) {
2207                                 ast_log(LOG_DEBUG, "Oooh, format changed to %d\n", f->subclass);
2208                                 p->owner->nativeformats = f->subclass;
2209                                 ast_set_read_format(p->owner, p->owner->readformat);
2210                                 ast_set_write_format(p->owner, p->owner->writeformat);
2211                         }
2212             if ((p->dtmfmode & SIP_DTMF_INBAND) && p->vad) {
2213                    f = ast_dsp_process(p->owner,p->vad,f);
2214                    if (f && (f->frametype == AST_FRAME_DTMF))
2215                         ast_log(LOG_DEBUG, "Detected DTMF '%c'\n", f->subclass);
2216             }
2217                 }
2218         }
2219         return f;
2220 }
2221
2222 /*--- sip_read: Read SIP RTP from channel */
2223 static struct ast_frame *sip_read(struct ast_channel *ast)
2224 {
2225         struct ast_frame *fr;
2226         struct sip_pvt *p = ast->pvt->pvt;
2227         ast_mutex_lock(&p->lock);
2228         fr = sip_rtp_read(ast, p);
2229         time(&p->lastrtprx);
2230         ast_mutex_unlock(&p->lock);
2231         return fr;
2232 }
2233
2234 /*--- build_callid: Build SIP CALLID header ---*/
2235 static void build_callid(char *callid, int len, struct in_addr ourip, char *fromdomain)
2236 {
2237         int res;
2238         int val;
2239         int x;
2240         char iabuf[INET_ADDRSTRLEN];
2241         for (x=0;x<4;x++) {
2242                 val = rand();
2243                 res = snprintf(callid, len, "%08x", val);
2244                 len -= res;
2245                 callid += res;
2246         }
2247         if (!ast_strlen_zero(fromdomain))
2248                 snprintf(callid, len, "@%s", fromdomain);
2249         else
2250         /* It's not important that we really use our right IP here... */
2251                 snprintf(callid, len, "@%s", ast_inet_ntoa(iabuf, sizeof(iabuf), ourip));
2252 }
2253
2254 /*--- sip_alloc: Allocate SIP_PVT structure and set defaults ---*/
2255 static struct sip_pvt *sip_alloc(char *callid, struct sockaddr_in *sin, int useglobal_nat)
2256 {
2257         struct sip_pvt *p;
2258         char iabuf[INET_ADDRSTRLEN];
2259
2260         p = malloc(sizeof(struct sip_pvt));
2261         if (!p)
2262                 return NULL;
2263         /* Keep track of stuff */
2264         memset(p, 0, sizeof(struct sip_pvt));
2265         ast_mutex_init(&p->lock);
2266         p->initid = -1;
2267         p->autokillid = -1;
2268         p->stateid = -1;
2269 #ifdef OSP_SUPPORT
2270         p->osphandle = -1;
2271 #endif
2272         if (sin) {
2273                 memcpy(&p->sa, sin, sizeof(p->sa));
2274                 if (ast_sip_ouraddrfor(&p->sa.sin_addr,&p->ourip))
2275                         memcpy(&p->ourip, &__ourip, sizeof(p->ourip));
2276         } else {
2277                 memcpy(&p->ourip, &__ourip, sizeof(p->ourip));
2278         }
2279         p->rtp = ast_rtp_new_with_bindaddr(sched, io, 1, 0, bindaddr.sin_addr);
2280         if (videosupport)
2281                 p->vrtp = ast_rtp_new_with_bindaddr(sched, io, 1, 0, bindaddr.sin_addr);
2282         p->branch = rand();
2283         p->tag = rand();
2284
2285         /* Start with 101 instead of 1 */
2286         p->ocseq = 101;
2287         if (!p->rtp) {
2288                 ast_log(LOG_WARNING, "Unable to create RTP session: %s\n", strerror(errno));
2289                 ast_mutex_destroy(&p->lock);
2290                 free(p);
2291                 return NULL;
2292         }
2293         ast_rtp_settos(p->rtp, tos);
2294         if (p->vrtp)
2295                 ast_rtp_settos(p->vrtp, tos);
2296         if (useglobal_nat && sin) {
2297                 /* Setup NAT structure according to global settings if we have an address */
2298                 p->nat = global_nat;
2299                 memcpy(&p->recv, sin, sizeof(p->recv));
2300                 ast_rtp_setnat(p->rtp, (p->nat & SIP_NAT_ROUTE));
2301                 if (p->vrtp)
2302                         ast_rtp_setnat(p->vrtp, (p->nat & SIP_NAT_ROUTE));
2303         }
2304
2305         strncpy(p->fromdomain, default_fromdomain, sizeof(p->fromdomain) - 1);
2306         /* z9hG4bK is a magic cookie.  See RFC 3261 section 8.1.1.7 */
2307         if (p->nat != SIP_NAT_NEVER)
2308                 snprintf(p->via, sizeof(p->via), "SIP/2.0/UDP %s:%d;branch=z9hG4bK%08x;rport", ast_inet_ntoa(iabuf, sizeof(iabuf), p->ourip), ourport, p->branch);
2309         else
2310                 snprintf(p->via, sizeof(p->via), "SIP/2.0/UDP %s:%d;branch=z9hG4bK%08x", ast_inet_ntoa(iabuf, sizeof(iabuf), p->ourip), ourport, p->branch);
2311         if (!callid)
2312                 build_callid(p->callid, sizeof(p->callid), p->ourip, p->fromdomain);
2313         else
2314                 strncpy(p->callid, callid, sizeof(p->callid) - 1);
2315         /* Assume reinvite OK and via INVITE */
2316         p->canreinvite = global_canreinvite;
2317         /* Assign default music on hold class */
2318         strncpy(p->musicclass, global_musicclass, sizeof(p->musicclass) - 1);
2319         p->dtmfmode = global_dtmfmode;
2320         p->promiscredir = global_promiscredir;
2321         p->trustrpid = global_trustrpid;
2322         p->progressinband = global_progressinband;
2323 #ifdef OSP_SUPPORT
2324         p->ospauth = global_ospauth;
2325 #endif
2326         p->rtptimeout = global_rtptimeout;
2327         p->rtpholdtimeout = global_rtpholdtimeout;
2328         p->capability = global_capability;
2329         if (p->dtmfmode & SIP_DTMF_RFC2833)
2330                 p->noncodeccapability |= AST_RTP_DTMF;
2331         strncpy(p->context, default_context, sizeof(p->context) - 1);
2332         /* Add to list */
2333         ast_mutex_lock(&iflock);
2334         p->next = iflist;
2335         iflist = p;
2336         ast_mutex_unlock(&iflock);
2337         if (option_debug)
2338                 ast_log(LOG_DEBUG, "Allocating new SIP call for %s\n", callid);
2339         return p;
2340 }
2341
2342 /*--- find_call: Connect incoming SIP message to current call or create new call structure */
2343 /*               Called by handle_request ,sipsock_read */
2344 static struct sip_pvt *find_call(struct sip_request *req, struct sockaddr_in *sin)
2345 {
2346         struct sip_pvt *p;
2347         char *callid;
2348         char tmp[256] = "";
2349         char iabuf[INET_ADDRSTRLEN];
2350         char *cmd;
2351         char *tag = "", *c;
2352
2353         callid = get_header(req, "Call-ID");
2354
2355         if (pedanticsipchecking) {
2356                 /* In principle Call-ID's uniquely identify a call, however some vendors
2357                    (i.e. Pingtel) send multiple calls with the same Call-ID and different
2358                    tags in order to simplify billing.  The RFC does state that we have to
2359                    compare tags in addition to the call-id, but this generate substantially
2360                    more overhead which is totally unnecessary for the vast majority of sane
2361                    SIP implementations, and thus Asterisk does not enable this behavior
2362                    by default. Short version: You'll need this option to support conferencing
2363                    on the pingtel */
2364                 strncpy(tmp, req->header[0], sizeof(tmp) - 1);
2365                 cmd = tmp;
2366                 c = strchr(tmp, ' ');
2367                 if (c)
2368                         *c = '\0';
2369                 if (!strcasecmp(cmd, "SIP/2.0"))
2370                         strncpy(tmp, get_header(req, "To"), sizeof(tmp) - 1);
2371                 else
2372                         strncpy(tmp, get_header(req, "From"), sizeof(tmp) - 1);
2373                 tag = strstr(tmp, "tag=");
2374                 if (tag) {
2375                         tag += 4;
2376                         c = strchr(tag, ';');
2377                         if (c)
2378                                 *c = '\0';
2379                 }
2380
2381         }
2382
2383         if (ast_strlen_zero(callid)) {
2384                 ast_log(LOG_WARNING, "Call missing call ID from '%s'\n", ast_inet_ntoa(iabuf, sizeof(iabuf), sin->sin_addr));
2385                 return NULL;
2386         }
2387         ast_mutex_lock(&iflock);
2388         p = iflist;
2389         while(p) {
2390                 if (!strcmp(p->callid, callid) &&
2391                         (!pedanticsipchecking || !tag || ast_strlen_zero(p->theirtag) || !strcmp(p->theirtag, tag))) {
2392                         /* Found the call */
2393                         ast_mutex_lock(&p->lock);
2394                         ast_mutex_unlock(&iflock);
2395                         return p;
2396                 }
2397                 p = p->next;
2398         }
2399         ast_mutex_unlock(&iflock);
2400         p = sip_alloc(callid, sin, 1);
2401         if (p)
2402                 ast_mutex_lock(&p->lock);
2403         return p;
2404 }
2405
2406 /*--- sip_register: Parse register=> line in sip.conf and add to registry */
2407 static int sip_register(char *value, int lineno)
2408 {
2409         struct sip_registry *reg;
2410         char copy[256] = "";
2411         char *username=NULL, *hostname=NULL, *secret=NULL, *authuser=NULL;
2412         char *porta=NULL;
2413         char *contact=NULL;
2414         char *stringp=NULL;
2415
2416         if (!value)
2417                 return -1;
2418         strncpy(copy, value, sizeof(copy)-1);
2419         stringp=copy;
2420         username = stringp;
2421         hostname = strrchr(stringp, '@');
2422         if (hostname) {
2423                 *hostname = '\0';
2424                 hostname++;
2425         }
2426         if (!username || ast_strlen_zero(username) || !hostname || ast_strlen_zero(hostname)) {
2427                 ast_log(LOG_WARNING, "Format for registration is user[:secret[:authuser]]@host[:port][/contact] at line %d", lineno);
2428                 return -1;
2429         }
2430         stringp=username;
2431         username = strsep(&stringp, ":");
2432         if (username) {
2433                 secret = strsep(&stringp, ":");
2434                 if (secret)
2435                         authuser = strsep(&stringp, ":");
2436         }
2437         stringp = hostname;
2438         hostname = strsep(&stringp, "/");
2439         if (hostname)
2440                 contact = strsep(&stringp, "/");
2441         if (!contact || ast_strlen_zero(contact))
2442                 contact = "s";
2443         stringp=hostname;
2444         hostname = strsep(&stringp, ":");
2445         porta = strsep(&stringp, ":");
2446
2447         if (porta && !atoi(porta)) {
2448                 ast_log(LOG_WARNING, "%s is not a valid port number at line %d\n", porta, lineno);
2449                 return -1;
2450         }
2451         reg = malloc(sizeof(struct sip_registry));
2452         if (reg) {
2453                 memset(reg, 0, sizeof(struct sip_registry));
2454                 strncpy(reg->contact, contact, sizeof(reg->contact) - 1);
2455                 if (username)
2456                         strncpy(reg->username, username, sizeof(reg->username)-1);
2457                 if (hostname)
2458                         strncpy(reg->hostname, hostname, sizeof(reg->hostname)-1);
2459                 if (authuser)
2460                         strncpy(reg->authuser, authuser, sizeof(reg->authuser)-1);
2461                 if (secret)
2462                         strncpy(reg->secret, secret, sizeof(reg->secret)-1);
2463                 reg->expire = -1;
2464                 reg->timeout =  -1;
2465                 reg->refresh = default_expiry;
2466                 reg->portno = porta ? atoi(porta) : 0;
2467                 reg->callid_valid = 0;
2468                 reg->ocseq = 101;
2469                 ast_mutex_lock(&regl.lock);
2470                 reg->next = regl.registrations;
2471                 regl.registrations = reg;
2472                 ast_mutex_unlock(&regl.lock);
2473         } else {
2474                 ast_log(LOG_ERROR, "Out of memory\n");
2475                 return -1;
2476         }
2477         return 0;
2478 }
2479
2480 /*--- lws2sws: Parse multiline SIP headers into one header */
2481 /* This is enabled if pedanticsipchecking is enabled */
2482 static int lws2sws(char *msgbuf, int len)
2483 {
2484         int h = 0, t = 0;
2485         int lws = 0;
2486
2487         for (; h < len;) {
2488                 /* Eliminate all CRs */
2489                 if (msgbuf[h] == '\r') {
2490                         h++;
2491                         continue;
2492                 }
2493                 /* Check for end-of-line */
2494                 if (msgbuf[h] == '\n') {
2495                 /* Check for end-of-message */
2496                         if (h + 1 == len)
2497                         break;
2498                 /* Check for a continuation line */
2499                 if (msgbuf[h + 1] == ' ') {
2500                 /* Merge continuation line */
2501                         h++;
2502                         continue;
2503                 }
2504                 /* Propagate LF and start new line */
2505                 msgbuf[t++] = msgbuf[h++];
2506                 lws = 0;
2507                 continue;
2508         }
2509
2510         if (msgbuf[h] == ' ' || msgbuf[h] == '\t') {
2511                 if (lws) {
2512                         h++;
2513                         continue;
2514                 }
2515                 msgbuf[t++] = msgbuf[h++];
2516                 lws = 1;
2517                 continue;
2518         }
2519         msgbuf[t++] = msgbuf[h++];
2520         if (lws)
2521                 lws = 0;
2522         }
2523         msgbuf[t] = '\0';
2524         return t;
2525 }
2526
2527 /*--- parse: Parse a SIP message ----*/
2528 static void parse(struct sip_request *req)
2529 {
2530         /* Divide fields by NULL's */
2531         char *c;
2532         int f = 0;
2533         c = req->data;
2534
2535         /* First header starts immediately */
2536         req->header[f] = c;
2537         while(*c) {
2538                 if (*c == '\n') {
2539                         /* We've got a new header */
2540                         *c = 0;
2541
2542 #if 0
2543                         printf("Header: %s (%d)\n", req->header[f], strlen(req->header[f]));
2544 #endif
2545                         if (ast_strlen_zero(req->header[f])) {
2546                                 /* Line by itself means we're now in content */
2547                                 c++;
2548                                 break;
2549                         }
2550                         if (f >= SIP_MAX_HEADERS - 1) {
2551                                 ast_log(LOG_WARNING, "Too many SIP headers...\n");
2552                         } else
2553                                 f++;
2554                         req->header[f] = c + 1;
2555                 } else if (*c == '\r') {
2556                         /* Ignore but eliminate \r's */
2557                         *c = 0;
2558                 }
2559                 c++;
2560         }
2561         /* Check for last header */
2562         if (!ast_strlen_zero(req->header[f]))
2563                 f++;
2564         req->headers = f;
2565         /* Now we process any mime content */
2566         f = 0;
2567         req->line[f] = c;
2568         while(*c) {
2569                 if (*c == '\n') {
2570                         /* We've got a new line */
2571                         *c = 0;
2572 #if 0
2573                         printf("Line: %s (%d)\n", req->line[f], strlen(req->line[f]));
2574 #endif
2575                         if (f >= SIP_MAX_LINES - 1) {
2576                                 ast_log(LOG_WARNING, "Too many SDP lines...\n");
2577                         } else
2578                                 f++;
2579                         req->line[f] = c + 1;
2580                 } else if (*c == '\r') {
2581                         /* Ignore and eliminate \r's */
2582                         *c = 0;
2583                 }
2584                 c++;
2585         }
2586         /* Check for last line */
2587         if (!ast_strlen_zero(req->line[f]))
2588                 f++;
2589         req->lines = f;
2590         if (*c)
2591                 ast_log(LOG_WARNING, "Odd content, extra stuff left over ('%s')\n", c);
2592 }
2593
2594 /*--- process_sdp: Process SIP SDP ---*/
2595 static int process_sdp(struct sip_pvt *p, struct sip_request *req)
2596 {
2597         char *m;
2598         char *c;
2599         char *a;
2600         char host[258];
2601         char iabuf[INET_ADDRSTRLEN];
2602         int len = -1;
2603         int portno=0;
2604         int vportno=0;
2605         int peercapability, peernoncodeccapability;
2606         int vpeercapability=0, vpeernoncodeccapability=0;
2607         struct sockaddr_in sin;
2608         char *codecs;
2609         struct hostent *hp;
2610         struct ast_hostent ahp;
2611         int codec;
2612         int iterator;
2613         int sendonly = 0;
2614         int x,y;
2615         int debug=sip_debug_test_pvt(p);
2616
2617         /* Update our last rtprx when we receive an SDP, too */
2618         time(&p->lastrtprx);
2619
2620         /* Get codec and RTP info from SDP */
2621         if (strcasecmp(get_header(req, "Content-Type"), "application/sdp")) {
2622                 ast_log(LOG_NOTICE, "Content is '%s', not 'application/sdp'\n", get_header(req, "Content-Type"));
2623                 return -1;
2624         }
2625         m = get_sdp(req, "m");
2626         c = get_sdp(req, "c");
2627         if (ast_strlen_zero(m) || ast_strlen_zero(c)) {
2628                 ast_log(LOG_WARNING, "Insufficient information for SDP (m = '%s', c = '%s')\n", m, c);
2629                 return -1;
2630         }
2631         if (sscanf(c, "IN IP4 %256s", host) != 1) {
2632                 ast_log(LOG_WARNING, "Invalid host in c= line, '%s'\n", c);
2633                 return -1;
2634         }
2635         /* XXX This could block for a long time, and block the main thread! XXX */
2636         hp = ast_gethostbyname(host, &ahp);
2637         if (!hp) {
2638                 ast_log(LOG_WARNING, "Unable to lookup host in c= line, '%s'\n", c);
2639                 return -1;
2640         }
2641         sdpLineNum_iterator_init(&iterator);
2642         p->novideo = 1;
2643         while ((m = get_sdp_iterate(&iterator, req, "m"))[0] != '\0') {
2644                 if ((sscanf(m, "audio %d RTP/AVP %n", &x, &len) == 1) ||
2645                     (sscanf(m, "audio %d/%d RTP/AVP %n", &x, &y, &len) == 2)) {
2646                         portno = x;
2647                         /* Scan through the RTP payload types specified in a "m=" line: */
2648                         ast_rtp_pt_clear(p->rtp);
2649                         codecs = m + len;
2650                         while(!ast_strlen_zero(codecs)) {
2651                                 if (sscanf(codecs, "%d%n", &codec, &len) != 1) {
2652                                         ast_log(LOG_WARNING, "Error in codec string '%s'\n", codecs);
2653                                         return -1;
2654                                 }
2655                                 if (debug)
2656                                         ast_verbose("Found RTP audio format %d\n", codec);
2657                                 ast_rtp_set_m_type(p->rtp, codec);
2658                                 codecs += len;
2659                                 /* Skip over any whitespace */
2660                                 while(*codecs && (*codecs < 33)) codecs++;
2661                         }
2662                 }
2663                 if (p->vrtp)
2664                         ast_rtp_pt_clear(p->vrtp);  /* Must be cleared in case no m=video line exists */
2665
2666                 if (p->vrtp && (sscanf(m, "video %d RTP/AVP %n", &x, &len) == 1)) {
2667                         p->novideo = 0;
2668                         vportno = x;
2669                         /* Scan through the RTP payload types specified in a "m=" line: */
2670                         codecs = m + len;
2671                         while(!ast_strlen_zero(codecs)) {
2672                                 if (sscanf(codecs, "%d%n", &codec, &len) != 1) {
2673                                         ast_log(LOG_WARNING, "Error in codec string '%s'\n", codecs);
2674                                         return -1;
2675                                 }
2676                                 if (debug)
2677                                         ast_verbose("Found video format %s\n", ast_getformatname(codec));
2678                                 ast_rtp_set_m_type(p->vrtp, codec);
2679                                 codecs += len;
2680                                 /* Skip over any whitespace */
2681                                 while(*codecs && (*codecs < 33)) codecs++;
2682                         }
2683                 }
2684         }
2685
2686         /* RTP addresses and ports for audio and video */
2687         sin.sin_family = AF_INET;
2688         memcpy(&sin.sin_addr, hp->h_addr, sizeof(sin.sin_addr));
2689
2690         /* Setup audio port number */
2691         sin.sin_port = htons(portno);
2692         if (p->rtp && sin.sin_port) {
2693                 ast_rtp_set_peer(p->rtp, &sin);
2694                 if (debug) {
2695                         ast_verbose("Peer audio RTP is at port %s:%d\n", ast_inet_ntoa(iabuf,sizeof(iabuf), sin.sin_addr), ntohs(sin.sin_port));
2696                         ast_log(LOG_DEBUG,"Peer audio RTP is at port %s:%d\n",ast_inet_ntoa(iabuf, sizeof(iabuf), sin.sin_addr), ntohs(sin.sin_port));
2697                 }
2698         }
2699         /* Setup video port number */
2700         sin.sin_port = htons(vportno);
2701         if (p->vrtp && sin.sin_port) {
2702                 ast_rtp_set_peer(p->vrtp, &sin);
2703                 if (debug) {
2704                         ast_verbose("Peer video RTP is at port %s:%d\n", ast_inet_ntoa(iabuf,sizeof(iabuf), sin.sin_addr), ntohs(sin.sin_port));
2705                         ast_log(LOG_DEBUG,"Peer video RTP is at port %s:%d\n",ast_inet_ntoa(iabuf, sizeof(iabuf), sin.sin_addr), ntohs(sin.sin_port));
2706                 }
2707         }
2708
2709         /* Next, scan through each "a=rtpmap:" line, noting each
2710          * specified RTP payload type (with corresponding MIME subtype):
2711          */
2712         sdpLineNum_iterator_init(&iterator);
2713         while ((a = get_sdp_iterate(&iterator, req, "a"))[0] != '\0') {
2714       char* mimeSubtype = ast_strdupa(a); /* ensures we have enough space */
2715           if (!strcasecmp(a, "sendonly")) {
2716                 sendonly=1;
2717                 continue;
2718           }
2719           if (!strcasecmp(a, "sendrecv")) {
2720                 sendonly=0;
2721           }
2722           if (sscanf(a, "rtpmap: %u %[^/]/", &codec, mimeSubtype) != 2) continue;
2723           if (debug)
2724                 ast_verbose("Found description format %s\n", mimeSubtype);
2725           /* Note: should really look at the 'freq' and '#chans' params too */
2726           ast_rtp_set_rtpmap_type(p->rtp, codec, "audio", mimeSubtype);
2727           if (p->vrtp)
2728                   ast_rtp_set_rtpmap_type(p->vrtp, codec, "video", mimeSubtype);
2729         }
2730
2731         /* Now gather all of the codecs that were asked for: */
2732         ast_rtp_get_current_formats(p->rtp,
2733                                 &peercapability, &peernoncodeccapability);
2734         if (p->vrtp)
2735                 ast_rtp_get_current_formats(p->vrtp,
2736                                 &vpeercapability, &vpeernoncodeccapability);
2737         p->jointcapability = p->capability & (peercapability | vpeercapability);
2738         p->peercapability = (peercapability | vpeercapability);
2739         p->noncodeccapability = noncodeccapability & peernoncodeccapability;
2740
2741         if (debug) {
2742                 const unsigned slen=80;
2743                 char s1[slen], s2[slen], s3[slen], s4[slen];
2744
2745                 ast_verbose("Capabilities: us - %s, peer - audio=%s/video=%s, combined - %s\n",
2746                         ast_getformatname_multiple(s1, slen, p->capability),
2747                         ast_getformatname_multiple(s2, slen, peercapability),
2748                         ast_getformatname_multiple(s3, slen, vpeercapability),
2749                         ast_getformatname_multiple(s4, slen, p->jointcapability));
2750
2751                 ast_verbose("Non-codec capabilities: us - %s, peer - %s, combined - %s\n",
2752                         ast_getformatname_multiple(s1, slen, noncodeccapability),
2753                         ast_getformatname_multiple(s2, slen, peernoncodeccapability),
2754                         ast_getformatname_multiple(s3, slen, p->noncodeccapability));
2755         }
2756         if (!p->jointcapability) {
2757                 ast_log(LOG_WARNING, "No compatible codecs!\n");
2758                 return -1;
2759         }
2760         if (p->owner) {
2761                 if (!(p->owner->nativeformats & p->jointcapability)) {
2762                         const unsigned slen=80;
2763                         char s1[slen], s2[slen];
2764                         ast_log(LOG_DEBUG, "Oooh, we need to change our formats since our peer supports only %s and not %s\n",
2765                                         ast_getformatname_multiple(s1, slen, p->jointcapability),
2766                                         ast_getformatname_multiple(s2, slen, p->owner->nativeformats));
2767                         p->owner->nativeformats = sip_codec_choose(p->jointcapability);
2768                         ast_set_read_format(p->owner, p->owner->readformat);
2769                         ast_set_write_format(p->owner, p->owner->writeformat);
2770                 }
2771                 if (ast_bridged_channel(p->owner)) {
2772                         /* Turn on/off music on hold if we are holding/unholding */
2773                         if (sin.sin_addr.s_addr && !sendonly) {
2774                                 ast_moh_stop(ast_bridged_channel(p->owner));
2775                         } else {
2776                                 ast_moh_start(ast_bridged_channel(p->owner), NULL);
2777                         }
2778                 }
2779         }
2780         return 0;
2781
2782 }
2783
2784 /*--- add_header: Add header to SIP message */
2785 static int add_header(struct sip_request *req, char *var, char *value)
2786 {
2787         if (req->len >= sizeof(req->data) - 4) {
2788                 ast_log(LOG_WARNING, "Out of space, can't add anymore (%s:%s)\n", var, value);
2789                 return -1;
2790         }
2791         if (req->lines) {
2792                 ast_log(LOG_WARNING, "Can't add more headers when lines have been added\n");
2793                 return -1;
2794         }
2795         req->header[req->headers] = req->data + req->len;
2796         snprintf(req->header[req->headers], sizeof(req->data) - req->len - 4, "%s: %s\r\n", var, value);
2797         req->len += strlen(req->header[req->headers]);
2798         if (req->headers < SIP_MAX_HEADERS)
2799                 req->headers++;
2800         else {
2801                 ast_log(LOG_WARNING, "Out of header space\n");
2802                 return -1;
2803         }
2804         return 0;
2805 }
2806
2807 /*--- add_blank_header: Add blank header to SIP message */
2808 static int add_blank_header(struct sip_request *req)
2809 {
2810         if (req->len >= sizeof(req->data) - 4) {
2811                 ast_log(LOG_WARNING, "Out of space, can't add anymore\n");
2812                 return -1;
2813         }
2814         if (req->lines) {
2815                 ast_log(LOG_WARNING, "Can't add more headers when lines have been added\n");
2816                 return -1;
2817         }
2818         req->header[req->headers] = req->data + req->len;
2819         snprintf(req->header[req->headers], sizeof(req->data) - req->len, "\r\n");
2820         req->len += strlen(req->header[req->headers]);
2821         if (req->headers < SIP_MAX_HEADERS)
2822                 req->headers++;
2823         else {
2824                 ast_log(LOG_WARNING, "Out of header space\n");
2825                 return -1;
2826         }
2827         return 0;
2828 }
2829
2830 /*--- add_line: Add content (not header) to SIP message */
2831 static int add_line(struct sip_request *req, char *line)
2832 {
2833         if (req->len >= sizeof(req->data) - 4) {
2834                 ast_log(LOG_WARNING, "Out of space, can't add anymore\n");
2835                 return -1;
2836         }
2837         if (!req->lines) {
2838                 /* Add extra empty return */
2839                 snprintf(req->data + req->len, sizeof(req->data) - req->len, "\r\n");
2840                 req->len += strlen(req->data + req->len);
2841         }
2842         req->line[req->lines] = req->data + req->len;
2843         snprintf(req->line[req->lines], sizeof(req->data) - req->len, "%s", line);
2844         req->len += strlen(req->line[req->lines]);
2845         if (req->lines < SIP_MAX_LINES)
2846                 req->lines++;
2847         else {
2848                 ast_log(LOG_WARNING, "Out of line space\n");
2849                 return -1;
2850         }
2851         return 0;
2852 }
2853
2854 /*--- copy_header: Copy one header field from one request to another */
2855 static int copy_header(struct sip_request *req, struct sip_request *orig, char *field)
2856 {
2857         char *tmp;
2858         tmp = get_header(orig, field);
2859         if (!ast_strlen_zero(tmp)) {
2860                 /* Add what we're responding to */
2861                 return add_header(req, field, tmp);
2862         }
2863         ast_log(LOG_NOTICE, "No field '%s' present to copy\n", field);
2864         return -1;
2865 }
2866
2867 /*--- copy_all_header: Copy all headers from one request to another ---*/
2868 static int copy_all_header(struct sip_request *req, struct sip_request *orig, char *field)
2869 {
2870         char *tmp;
2871         int start = 0;
2872         int copied = 0;
2873         for (;;) {
2874                 tmp = __get_header(orig, field, &start);
2875                 if (!ast_strlen_zero(tmp)) {
2876                         /* Add what we're responding to */
2877                         add_header(req, field, tmp);
2878                         copied++;
2879                 } else
2880                         break;
2881         }
2882         return copied ? 0 : -1;
2883 }
2884
2885 /*--- copy_via_headers: Copy SIP VIA Headers from one request to another ---*/
2886 static int copy_via_headers(struct sip_pvt *p, struct sip_request *req, struct sip_request *orig, char *field)
2887 {
2888         char tmp[256]="", *oh, *end;
2889         int start = 0;
2890         int copied = 0;
2891         char new[256];
2892         char iabuf[INET_ADDRSTRLEN];
2893         for (;;) {
2894                 oh = __get_header(orig, field, &start);
2895                 if (!ast_strlen_zero(oh)) {
2896                         /* Strip ;rport */
2897                         strncpy(tmp, oh, sizeof(tmp) - 1);
2898                         oh = strstr(tmp, ";rport");
2899                         if (oh) {
2900                                 end = strchr(oh + 1, ';');
2901                                 if (end)
2902                                         memmove(oh, end, strlen(end) + 1);
2903                                 else
2904                                         *oh = '\0';
2905                         }
2906                         if (!copied && (p->nat == SIP_NAT_ALWAYS)) {
2907                                 /* Whoo hoo!  Now we can indicate port address translation too!  Just
2908                                    another RFC (RFC3581). I'll leave the original comments in for
2909                                    posterity.  */
2910                                 snprintf(new, sizeof(new), "%s;received=%s;rport=%d", tmp, ast_inet_ntoa(iabuf, sizeof(iabuf), p->recv.sin_addr), ntohs(p->recv.sin_port));
2911                                 add_header(req, field, new);
2912                         } else {
2913                                 /* Add what we're responding to */
2914                                 add_header(req, field, tmp);
2915                         }
2916                         copied++;
2917                 } else
2918                         break;
2919         }
2920         if (!copied) {
2921                 ast_log(LOG_NOTICE, "No field '%s' present to copy\n", field);
2922                 return -1;
2923         }
2924         return 0;
2925 }
2926
2927 /*--- add_route: Add route header into request per learned route ---*/
2928 static void add_route(struct sip_request *req, struct sip_route *route)
2929 {
2930         char r[256], *p;
2931         int n, rem = 255; /* sizeof(r)-1: Room for terminating 0 */
2932
2933         if (!route) return;
2934
2935         p = r;
2936         while (route) {
2937                 n = strlen(route->hop);
2938                 if ((n+3)>rem) break;
2939                 if (p != r) {
2940                         *p++ = ',';
2941                         --rem;
2942                 }
2943                 *p++ = '<';
2944                 strncpy(p, route->hop, rem);  p += n;
2945                 *p++ = '>';
2946                 rem -= (n+2);
2947                 route = route->next;
2948         }
2949         *p = '\0';
2950         add_header(req, "Route", r);
2951 }
2952
2953 /*--- set_destination: Set destination from SIP URI ---*/
2954 static void set_destination(struct sip_pvt *p, char *uri)
2955 {
2956         char *h, *maddr, hostname[256] = "";
2957         char iabuf[INET_ADDRSTRLEN];
2958         int port, hn;
2959         struct hostent *hp;
2960         struct ast_hostent ahp;
2961         int debug=sip_debug_test_pvt(p);
2962
2963         /* Parse uri to h (host) and port - uri is already just the part inside the <> */
2964         /* general form we are expecting is sip[s]:username[:password]@host[:port][;...] */
2965
2966         if (debug)
2967                 ast_verbose("set_destination: Parsing <%s> for address/port to send to\n", uri);
2968
2969         /* Find and parse hostname */
2970         h = strchr(uri, '@');
2971         if (h)
2972                 ++h;
2973         else {
2974                 h = uri;
2975                 if (strncmp(h, "sip:", 4) == 0)
2976                         h += 4;
2977                 else if (strncmp(h, "sips:", 5) == 0)
2978                         h += 5;
2979         }
2980         hn = strcspn(h, ":;>");
2981         if (hn > (sizeof(hostname) - 1)) hn = sizeof(hostname) - 1;
2982         strncpy(hostname, h, hn);  hostname[hn] = '\0'; /* safe */
2983         h+=hn;
2984
2985         /* Is "port" present? if not default to 5060 */
2986         if (*h == ':') {
2987                 /* Parse port */
2988                 ++h;
2989                 port = strtol(h, &h, 10);
2990         }
2991         else
2992                 port = 5060;
2993
2994         /* Got the hostname:port - but maybe there's a "maddr=" to override address? */
2995         maddr = strstr(h, "maddr=");
2996         if (maddr) {
2997                 maddr += 6;
2998                 hn = strspn(maddr, "0123456789.");
2999                 if (hn > (sizeof(hostname) - 1)) hn = sizeof(hostname) - 1;
3000                 strncpy(hostname, maddr, hn);  hostname[hn] = '\0'; /* safe */
3001         }
3002
3003         hp = ast_gethostbyname(hostname, &ahp);
3004         if (hp == NULL)  {
3005                 ast_log(LOG_WARNING, "Can't find address for host '%s'\n", hostname);
3006                 return;
3007         }
3008         p->sa.sin_family = AF_INET;
3009         memcpy(&p->sa.sin_addr, hp->h_addr, sizeof(p->sa.sin_addr));
3010         p->sa.sin_port = htons(port);
3011         if (debug)
3012                 ast_verbose("set_destination: set destination to %s, port %d\n", ast_inet_ntoa(iabuf, sizeof(iabuf), p->sa.sin_addr), port);
3013 }
3014
3015 /*--- init_resp: Initialize SIP response, based on SIP request ---*/
3016 static int init_resp(struct sip_request *req, char *resp, struct sip_request *orig)
3017 {
3018         /* Initialize a response */
3019         if (req->headers || req->len) {
3020                 ast_log(LOG_WARNING, "Request already initialized?!?\n");
3021                 return -1;
3022         }
3023         req->header[req->headers] = req->data + req->len;
3024         snprintf(req->header[req->headers], sizeof(req->data) - req->len, "SIP/2.0 %s\r\n", resp);
3025         req->len += strlen(req->header[req->headers]);
3026         if (req->headers < SIP_MAX_HEADERS)
3027                 req->headers++;
3028         else
3029                 ast_log(LOG_WARNING, "Out of header space\n");
3030         return 0;
3031 }
3032
3033 /*--- init_req: Initialize SIP request ---*/
3034 static int init_req(struct sip_request *req, char *resp, char *recip)
3035 {
3036         /* Initialize a response */
3037         if (req->headers || req->len) {
3038                 ast_log(LOG_WARNING, "Request already initialized?!?\n");
3039                 return -1;
3040         }
3041         req->header[req->headers] = req->data + req->len;
3042         snprintf(req->header[req->headers], sizeof(req->data) - req->len, "%s %s SIP/2.0\r\n", resp, recip);
3043         req->len += strlen(req->header[req->headers]);
3044         if (req->headers < SIP_MAX_HEADERS)
3045                 req->headers++;
3046         else
3047                 ast_log(LOG_WARNING, "Out of header space\n");
3048         return 0;
3049 }
3050
3051
3052 static int respprep(struct sip_request *resp, struct sip_pvt *p, char *msg, struct sip_request *req)
3053 {
3054         char newto[256] = "", *ot;
3055
3056         memset(resp, 0, sizeof(*resp));
3057         init_resp(resp, msg, req);
3058         copy_via_headers(p, resp, req, "Via");
3059         if (msg[0] == '2') copy_all_header(resp, req, "Record-Route");
3060         copy_header(resp, req, "From");
3061         ot = get_header(req, "To");
3062         if (!strstr(ot, "tag=")) {
3063                 /* Add the proper tag if we don't have it already.  If they have specified
3064                    their tag, use it.  Otherwise, use our own tag */
3065                 if (!ast_strlen_zero(p->theirtag) && p->outgoing)
3066                         snprintf(newto, sizeof(newto), "%s;tag=%s", ot, p->theirtag);
3067                 else if (p->tag && !p->outgoing)
3068                         snprintf(newto, sizeof(newto), "%s;tag=as%08x", ot, p->tag);
3069                 else {
3070                         strncpy(newto, ot, sizeof(newto) - 1);
3071                         newto[sizeof(newto) - 1] = '\0';
3072                 }
3073                 ot = newto;
3074         }
3075         add_header(resp, "To", ot);
3076         copy_header(resp, req, "Call-ID");
3077         copy_header(resp, req, "CSeq");
3078         add_header(resp, "User-Agent", default_useragent);
3079         add_header(resp, "Allow", ALLOWED_METHODS);
3080         if (p->expiry) {
3081                 /* For registration responses, we also need expiry and
3082                    contact info */
3083                 char contact[256];
3084                 char tmp[256];
3085                 snprintf(contact, sizeof(contact), "%s;expires=%d", p->our_contact, p->expiry);
3086                 snprintf(tmp, sizeof(tmp), "%d", p->expiry);
3087                 add_header(resp, "Expires", tmp);
3088                 add_header(resp, "Contact", contact);
3089         } else {
3090                 add_header(resp, "Contact", p->our_contact);
3091         }
3092         return 0;
3093 }
3094
3095 static int reqprep(struct sip_request *req, struct sip_pvt *p, char *msg, int seqno, int newbranch)
3096 {
3097         struct sip_request *orig = &p->initreq;
3098         char stripped[80] ="";
3099         char tmp[80];
3100         char newto[256];
3101         char iabuf[INET_ADDRSTRLEN];
3102         char *c, *n;
3103         char *ot, *of;
3104
3105         memset(req, 0, sizeof(struct sip_request));
3106
3107         snprintf(p->lastmsg, sizeof(p->lastmsg), "Tx: %s", msg);
3108
3109         if (!seqno) {
3110                 p->ocseq++;
3111                 seqno = p->ocseq;
3112         }
3113
3114         if (newbranch) {
3115                 p->branch ^= rand();
3116                 if (p->nat & SIP_NAT_RFC3581)
3117                         snprintf(p->via, sizeof(p->via), "SIP/2.0/UDP %s:%d;branch=z9hG4bK%08x;rport", ast_inet_ntoa(iabuf, sizeof(iabuf), p->ourip), ourport, p->branch);
3118                 else /* Some implementations (e.g. Uniden UIP200) can't handle rport being in the message!! */
3119                         snprintf(p->via, sizeof(p->via), "SIP/2.0/UDP %s:%d;branch=z9hG4bK%08x", ast_inet_ntoa(iabuf, sizeof(iabuf), p->ourip), ourport, p->branch);
3120         }
3121         if (!strcasecmp(msg, "CANCEL") || !strcasecmp(msg, "ACK")) {
3122                 /* MUST use original URI */
3123                 c = p->initreq.rlPart2;
3124         } else if (!ast_strlen_zero(p->uri)) {
3125                 c = p->uri;
3126         } else {
3127                 if (p->outgoing)
3128                         strncpy(stripped, get_header(orig, "To"), sizeof(stripped) - 1);
3129                 else
3130                         strncpy(stripped, get_header(orig, "From"), sizeof(stripped) - 1);
3131
3132                 c = strchr(stripped, '<');
3133                 if (c)
3134                         c++;
3135                 else
3136                         c = stripped;
3137                 n = strchr(c, '>');
3138                 if (n)
3139                         *n = '\0';
3140                 n = strchr(c, ';');
3141                 if (n)
3142                         *n = '\0';
3143         }
3144         init_req(req, msg, c);
3145
3146         snprintf(tmp, sizeof(tmp), "%d %s", seqno, msg);
3147
3148         add_header(req, "Via", p->via);
3149         if (p->route) {
3150                 set_destination(p, p->route->hop);
3151                 add_route(req, p->route->next);
3152         }
3153
3154         ot = get_header(orig, "To");
3155         of = get_header(orig, "From");
3156
3157         /* Add tag *unless* this is a CANCEL, in which case we need to send it exactly
3158            as our original request, including tag (or presumably lack thereof) */
3159         if (!strstr(ot, "tag=") && strcasecmp(msg, "CANCEL")) {
3160                 /* Add the proper tag if we don't have it already.  If they have specified
3161                    their tag, use it.  Otherwise, use our own tag */
3162                 if (p->outgoing && !ast_strlen_zero(p->theirtag))
3163                         snprintf(newto, sizeof(newto), "%s;tag=%s", ot, p->theirtag);
3164                 else if (!p->outgoing)
3165                         snprintf(newto, sizeof(newto), "%s;tag=as%08x", ot, p->tag);
3166                 else
3167                         snprintf(newto, sizeof(newto), "%s", ot);
3168                 ot = newto;
3169         }
3170
3171         if (p->outgoing) {
3172                 add_header(req, "From", of);
3173                 add_header(req, "To", ot);
3174         } else {
3175                 add_header(req, "From", ot);
3176                 add_header(req, "To", of);
3177         }
3178         add_header(req, "Contact", p->our_contact);
3179         copy_header(req, orig, "Call-ID");
3180         add_header(req, "CSeq", tmp);
3181
3182         add_header(req, "User-Agent", default_useragent);
3183         return 0;
3184 }
3185
3186 static int __transmit_response(struct sip_pvt *p, char *msg, struct sip_request *req, int reliable)
3187 {
3188         struct sip_request resp;
3189         int seqno = 0;
3190         if (reliable && (sscanf(get_header(req, "CSeq"), "%i ", &seqno) != 1)) {
3191                 ast_log(LOG_WARNING, "Unable to determine sequence number from '%s'\n", get_header(req, "CSeq"));
3192                 return -1;
3193         }
3194         respprep(&resp, p, msg, req);
3195         add_header(&resp, "Content-Length", "0");
3196         add_blank_header(&resp);
3197         return send_response(p, &resp, reliable, seqno);
3198 }
3199
3200 /*--- transmit_response: Transmit response, no retransmits */
3201 static int transmit_response(struct sip_pvt *p, char *msg, struct sip_request *req)
3202 {
3203         return __transmit_response(p, msg, req, 0);
3204 }
3205
3206 /*--- transmit_response: Transmit response, Make sure you get a reply */
3207 static int transmit_response_reliable(struct sip_pvt *p, char *msg, struct sip_request *req, int fatal)
3208 {
3209         return __transmit_response(p, msg, req, fatal ? 2 : 1);
3210 }
3211
3212 /*--- append_date: Append date to SIP message ---*/
3213 static void append_date(struct sip_request *req)
3214 {
3215         char tmpdat[256];
3216         struct tm tm;
3217         time_t t;
3218         time(&t);
3219         gmtime_r(&t, &tm);
3220         strftime(tmpdat, sizeof(tmpdat), "%a, %d %b %Y %T GMT", &tm);
3221         add_header(req, "Date", tmpdat);
3222 }
3223
3224 /*--- transmit_response_with_date: Append date and content length before transmitting response ---*/
3225 static int transmit_response_with_date(struct sip_pvt *p, char *msg, struct sip_request *req)
3226 {
3227         struct sip_request resp;
3228         respprep(&resp, p, msg, req);
3229         append_date(&resp);
3230         add_header(&resp, "Content-Length", "0");
3231         add_blank_header(&resp);
3232         return send_response(p, &resp, 0, 0);
3233 }
3234
3235 /*--- transmit_response_with_allow: Append Accept header, content length before transmitting response ---*/
3236 static int transmit_response_with_allow(struct sip_pvt *p, char *msg, struct sip_request *req, int reliable)
3237 {
3238         struct sip_request resp;
3239         respprep(&resp, p, msg, req);
3240         add_header(&resp, "Accept", "application/sdp");
3241         add_header(&resp, "Content-Length", "0");
3242         add_blank_header(&resp);
3243         return send_response(p, &resp, reliable, 0);
3244 }
3245
3246 /* transmit_response_with_auth: Respond with authorization request */
3247 static int transmit_response_with_auth(struct sip_pvt *p, char *msg, struct sip_request *req, char *randdata, int reliable, char *header)
3248 {
3249         struct sip_request resp;
3250         char tmp[256];
3251         int seqno = 0;
3252         if (reliable && (sscanf(get_header(req, "CSeq"), "%i ", &seqno) != 1)) {
3253                 ast_log(LOG_WARNING, "Unable to determine sequence number from '%s'\n", get_header(req, "CSeq"));
3254                 return -1;
3255         }
3256         snprintf(tmp, sizeof(tmp), "Digest realm=\"%s\", nonce=\"%s\"", global_realm, randdata);
3257         respprep(&resp, p, msg, req);
3258         add_header(&resp, header, tmp);
3259         add_header(&resp, "Content-Length", "0");
3260         add_blank_header(&resp);
3261         return send_response(p, &resp, reliable, seqno);
3262 }
3263
3264 /*--- add_text: Add text body to SIP message ---*/
3265 static int add_text(struct sip_request *req, char *text)
3266 {
3267         /* XXX Convert \n's to \r\n's XXX */
3268         int len = strlen(text);
3269         char clen[256];
3270         snprintf(clen, sizeof(clen), "%d", len);
3271         add_header(req, "Content-Type", "text/plain");
3272         add_header(req, "Content-Length", clen);
3273         add_line(req, text);
3274         return 0;
3275 }
3276
3277 /*--- add_digit: add DTMF INFO tone to sip message ---*/
3278 /* Always adds default duration 250 ms, regardless of what came in over the line */
3279 static int add_digit(struct sip_request *req, char digit)
3280 {
3281         char tmp[256];
3282         int len;
3283         char clen[256];
3284         snprintf(tmp, sizeof(tmp), "Signal=%c\r\nDuration=250\r\n", digit);
3285         len = strlen(tmp);
3286         snprintf(clen, sizeof(clen), "%d", len);
3287         add_header(req, "Content-Type", "application/dtmf-relay");
3288         add_header(req, "Content-Length", clen);
3289         add_line(req, tmp);
3290         return 0;
3291 }
3292
3293 /*--- add_sdp: Add Session Description Protocol message ---*/
3294 static int add_sdp(struct sip_request *resp, struct sip_pvt *p)
3295 {
3296         int len;
3297         int codec;
3298         int alreadysent = 0;
3299         char costr[80];
3300         struct sockaddr_in sin;
3301         struct sockaddr_in vsin;
3302         struct sip_codec_pref *cur;
3303         char v[256] = "";
3304         char s[256] = "";
3305         char o[256] = "";
3306         char c[256] = "";
3307         char t[256] = "";
3308         char m[256] = "";
3309         char m2[256] = "";
3310         char a[1024] = "";
3311         char a2[1024] = "";
3312         char iabuf[INET_ADDRSTRLEN];
3313         int x;
3314         int capability;
3315         struct sockaddr_in dest;
3316         struct sockaddr_in vdest = { 0, };
3317         int debug=sip_debug_test_pvt(p);
3318
3319         /* XXX We break with the "recommendation" and send our IP, in order that our
3320                peer doesn't have to ast_gethostbyname() us XXX */
3321         len = 0;
3322         if (!p->rtp) {
3323                 ast_log(LOG_WARNING, "No way to add SDP without an RTP structure\n");
3324                 return -1;
3325         }
3326         capability = p->capability;
3327
3328         if (!p->sessionid) {
3329                 p->sessionid = getpid();
3330                 p->sessionversion = p->sessionid;
3331         } else
3332                 p->sessionversion++;
3333         ast_rtp_get_us(p->rtp, &sin);
3334         if (p->vrtp)
3335                 ast_rtp_get_us(p->vrtp, &vsin);
3336
3337         if (p->redirip.sin_addr.s_addr) {
3338                 dest.sin_port = p->redirip.sin_port;
3339                 dest.sin_addr = p->redirip.sin_addr;
3340                 if (p->redircodecs)
3341                         capability = p->redircodecs;
3342         } else {
3343                 dest.sin_addr = p->ourip;
3344                 dest.sin_port = sin.sin_port;
3345         }
3346
3347         /* Determine video destination */
3348         if (p->vrtp) {
3349                 if (p->vredirip.sin_addr.s_addr) {
3350                         vdest.sin_port = p->vredirip.sin_port;
3351                         vdest.sin_addr = p->vredirip.sin_addr;
3352                 } else {
3353                         vdest.sin_addr = p->ourip;
3354                         vdest.sin_port = vsin.sin_port;
3355                 }
3356         }
3357         if (debug){
3358                 ast_verbose("We're at %s port %d\n", ast_inet_ntoa(iabuf, sizeof(iabuf), p->ourip), ntohs(sin.sin_port));
3359                 if (p->vrtp)
3360                         ast_verbose("Video is at %s port %d\n", ast_inet_ntoa(iabuf, sizeof(iabuf), p->ourip), ntohs(vsin.sin_port));
3361         }
3362         snprintf(v, sizeof(v), "v=0\r\n");
3363         snprintf(o, sizeof(o), "o=root %d %d IN IP4 %s\r\n", p->sessionid, p->sessionversion, ast_inet_ntoa(iabuf, sizeof(iabuf), dest.sin_addr));
3364         snprintf(s, sizeof(s), "s=session\r\n");
3365         snprintf(c, sizeof(c), "c=IN IP4 %s\r\n", ast_inet_ntoa(iabuf, sizeof(iabuf), dest.sin_addr));
3366         snprintf(t, sizeof(t), "t=0 0\r\n");
3367         snprintf(m, sizeof(m), "m=audio %d RTP/AVP", ntohs(dest.sin_port));
3368         snprintf(m2, sizeof(m2), "m=video %d RTP/AVP", ntohs(vdest.sin_port));
3369         if (capability & p->prefcodec) {
3370                 if (debug)
3371                         ast_verbose("Answering/Requesting with root capability %d\n", p->prefcodec);
3372                 codec = ast_rtp_lookup_code(p->rtp, 1, p->prefcodec);
3373                 if (codec > -1) {
3374                         snprintf(costr, sizeof(costr), " %d", codec);
3375                         if (p->prefcodec <= AST_FORMAT_MAX_AUDIO) {
3376                                 strncat(m, costr, sizeof(m) - strlen(m) - 1);
3377                                 snprintf(costr, sizeof(costr), "a=rtpmap:%d %s/8000\r\n", codec, ast_rtp_lookup_mime_subtype(1, p->prefcodec));
3378                                 strncpy(a, costr, sizeof(a) - 1);
3379                         } else {
3380                                 strncat(m2, costr, sizeof(m2) - strlen(m2) - 1);
3381                                 snprintf(costr, sizeof(costr), "a=rtpmap:%d %s/90000\r\n", codec, ast_rtp_lookup_mime_subtype(1, p->prefcodec));
3382                                 strncpy(a2, costr, sizeof(a2) - 1);
3383                         }
3384                 }
3385                 alreadysent |= p->prefcodec;
3386         }
3387         /* Start by sending our preferred codecs */
3388         cur = prefs;
3389         while(cur) {
3390                 if ((capability & cur->codec) && !(alreadysent & cur->codec)) {
3391                         if (debug)
3392                                 ast_verbose("Answering with preferred capability 0x%x(%s)\n", cur->codec, ast_getformatname(cur->codec));
3393                         codec = ast_rtp_lookup_code(p->rtp, 1, cur->codec);
3394                         if (codec > -1) {
3395                                 snprintf(costr, sizeof(costr), " %d", codec);
3396                                 if (cur->codec <= AST_FORMAT_MAX_AUDIO) {
3397                                         strncat(m, costr, sizeof(m) - strlen(m) - 1);
3398                                         snprintf(costr, sizeof(costr), "a=rtpmap:%d %s/8000\r\n", codec, ast_rtp_lookup_mime_subtype(1, cur->codec));
3399                                         strncat(a, costr, sizeof(a) - strlen(a) - 1);
3400                                 } else {
3401                                         strncat(m2, costr, sizeof(m2) - strlen(m2) - 1);
3402                                         snprintf(costr, sizeof(costr), "a=rtpmap:%d %s/90000\r\n", codec, ast_rtp_lookup_mime_subtype(1, cur->codec));
3403                                         strncat(a2, costr, sizeof(a2) - strlen(a) - 1);
3404                                 }
3405                         }
3406                 }
3407                 alreadysent |= cur->codec;
3408                 cur = cur->next;
3409         }
3410         /* Now send any other common codecs, and non-codec formats: */
3411         for (x = 1; x <= ((videosupport && p->vrtp) ? AST_FORMAT_MAX_VIDEO : AST_FORMAT_MAX_AUDIO); x <<= 1) {
3412                 if ((capability & x) && !(alreadysent & x)) {
3413                         if (debug)
3414                                 ast_verbose("Answering with capability 0x%x(%s)\n", x, ast_getformatname(x));
3415                         codec = ast_rtp_lookup_code(p->rtp, 1, x);
3416                         if (codec > -1) {
3417                                 snprintf(costr, sizeof(costr), " %d", codec);
3418                                 if (x <= AST_FORMAT_MAX_AUDIO) {
3419                                         strncat(m, costr, sizeof(m) - strlen(m) - 1);
3420                                         snprintf(costr, sizeof(costr), "a=rtpmap:%d %s/8000\r\n", codec, ast_rtp_lookup_mime_subtype(1, x));
3421                                         strncat(a, costr, sizeof(a) - strlen(a) - 1);
3422                                 } else {
3423                                         strncat(m2, costr, sizeof(m2) - strlen(m2) - 1);
3424                                         snprintf(costr, sizeof(costr), "a=rtpmap:%d %s/90000\r\n", codec, ast_rtp_lookup_mime_subtype(1, x));
3425                                         strncat(a2, costr, sizeof(a2) - strlen(a2) - 1);
3426                                 }
3427                         }
3428                 }
3429         }
3430         for (x = 1; x <= AST_RTP_MAX; x <<= 1) {
3431                 if (p->noncodeccapability & x) {
3432                         if (debug)
3433                                 ast_verbose("Answering with non-codec capability 0x%x(%s)\n", x, ast_getformatname(x));
3434                         codec = ast_rtp_lookup_code(p->rtp, 0, x);
3435                         if (codec > -1) {
3436                                 snprintf(costr, sizeof(costr), " %d", codec);
3437                                 strncat(m, costr, sizeof(m) - strlen(m) - 1);
3438                                 snprintf(costr, sizeof(costr), "a=rtpmap:%d %s/8000\r\n", codec, ast_rtp_lookup_mime_subtype(0, x));
3439                                 strncat(a, costr, sizeof(a) - strlen(a) - 1);
3440                                 if (x == AST_RTP_DTMF) {
3441                                   /* Indicate we support DTMF...  Not sure about 16, but MSN supports it so dang it, we will too... */
3442                                   snprintf(costr, sizeof costr, "a=fmtp:%d 0-16\r\n",
3443                                            codec);
3444                                   strncat(a, costr, sizeof(a) - strlen(a) - 1);
3445                                 }
3446                         }
3447                 }
3448         }
3449         strncat(a, "a=silenceSupp:off - - - -\r\n", sizeof(a) - strlen(a) - 1);
3450         if (strlen(m) < sizeof(m) - 2)
3451                 strncat(m, "\r\n", sizeof(m) - strlen(m) - 1);
3452         if (strlen(m2) < sizeof(m2) - 2)
3453                 strncat(m2, "\r\n", sizeof(m2) - strlen(m2) - 1);
3454         if ((sizeof(m) <= strlen(m) - 2) || (sizeof(m2) <= strlen(m2) - 2) || (sizeof(a) == strlen(a)) || (sizeof(a2) == strlen(a2)))
3455                 ast_log(LOG_WARNING, "SIP SDP may be truncated due to undersized buffer!!\n");
3456         len = strlen(v) + strlen(s) + strlen(o) + strlen(c) + strlen(t) + strlen(m) + strlen(a);
3457         if ((p->vrtp) && (!p->novideo) && (capability & VIDEO_CODEC_MASK)) /* only if video response is appropriate */
3458                 len += strlen(m2) + strlen(a2);
3459         snprintf(costr, sizeof(costr), "%d", len);
3460         add_header(resp, "Content-Type", "application/sdp");
3461         add_header(resp, "Content-Length", costr);
3462         add_line(resp, v);
3463         add_line(resp, o);
3464         add_line(resp, s);
3465   &n