channels/chan_h323.c

   1 /*
   2  * chan_h323.c
   3  *
   4  * OpenH323 Channel Driver for ASTERISK PBX.
   5  *                      By Jeremy McNamara
   6  *                      For The NuFone Network
   7  *
   8  * This code has been derived from code created by
   9  *              Michael Manousos and Mark Spencer
  10  *
  11  * This file is part of the chan_h323 driver for Asterisk
  12  *
  13  * chan_h323 is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License as published by
  15  * the Free Software Foundation; either version 2 of the License, or
  16  * (at your option) any later version.
  17  *
  18  * chan_h323 is distributed WITHOUT ANY WARRANTY; without even
  19  * the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
  20  * PURPOSE. See the GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  25  *
  26  * Version Info: $Id$
  27  */
  28
  29
  30 #include <stdio.h>
  31 #include <pthread.h>
  32 #include <string.h>
  33 #include <asterisk/lock.h>
  34 #include <asterisk/logger.h>
  35 #include <asterisk/channel.h>
  36 #include <asterisk/channel_pvt.h>
  37 #include <asterisk/config.h>
  38 #include <asterisk/module.h>
  39 #include <asterisk/pbx.h>
  40 #include <asterisk/options.h>
  41 #include <asterisk/lock.h>
  42 #include <asterisk/sched.h>
  43 #include <asterisk/io.h>
  44 #include <asterisk/rtp.h>
  45 #include <asterisk/acl.h>
  46 #include <asterisk/callerid.h>
  47 #include <asterisk/cli.h>
  48 #include <asterisk/dsp.h>
  49 #include <sys/socket.h>
  50 #include <net/if.h>
  51 #include <errno.h>
  52 #include <unistd.h>
  53 #include <stdlib.h>
  54 #include <fcntl.h>
  55 #include <netdb.h>
  56 #include <sys/signal.h>
  57 #include <netinet/ip.h>
  58
  59
  60 #include "h323/chan_h323.h"
  61
  62 /** String variables required by ASTERISK */
  63 static char *type       = "H323";
  64 static char *desc       = "The NuFone Network's Open H.323 Channel Driver";
  65 static char *tdesc      = "The NuFone Network's Open H.323 Channel Driver";
  66 static char *config = "h323.conf";
  67
  68 static char default_context[AST_MAX_EXTENSION];
  69
  70 /** H.323 configuration values */
  71 static char gatekeeper[100];
  72 static int      gatekeeper_disable = 1;
  73 static int      gatekeeper_discover = 0;
  74 static int  usingGk;
  75 static int      port = 1720;
  76 static int  gkroute = 0;
  77
  78 /* to find user by alias is default, alternative is the incomming call's source IP
  79 address*/
  80 static int  userbyalias = 1;
  81
  82 static int  bridge_default = 1;
  83
  84 /* Just about everybody seems to support ulaw, so make it a nice default */
  85 static int capability = AST_FORMAT_ULAW;
  86
  87 /* TOS flag */
  88 static int tos = 0;
  89
  90 static int dtmfmode = H323_DTMF_RFC2833;
  91
  92 static char secret[50];
  93
  94 /** Private structure of a OpenH323 channel */
  95 struct oh323_pvt {
  96         ast_mutex_t lock;                                       /* Channel private lock */
  97         call_options_t calloptions;                             /* Options to be used during call setup */
  98         int     alreadygone;                                            /* Whether or not we've already been destroyed by or peer */
  99         int needdestroy;                                                /* if we need to be destroyed */
 100         call_details_t cd;                                              /* Call details */
 101         struct ast_channel *owner;                              /* Who owns us */
 102         int capability;                                                 /* Special capability */
 103         int nonCodecCapability;
 104         int outgoing;                                                   /* Outgoing or incoming call? */
 105         int nat;                                                                /* Are we talking to a NAT EP?*/
 106         int bridge;                                                             /* Determine of we should native bridge or not*/
 107         char exten[AST_MAX_EXTENSION];                  /* Requested extension */
 108         char context[AST_MAX_EXTENSION];                /* Context where to start */
 109         char username[81];                                              /* H.323 alias using this channel */
 110         char accountcode[256];                                  /* Account code */
 111         int amaflags;                                                   /* AMA Flags */
 112         char callerid[80];                                              /* Caller*ID if available */
 113         struct ast_rtp *rtp;                                    /* RTP Session */
 114         int dtmfmode;
 115         struct ast_dsp *vad;                                    /* Used for in-band DTMF detection */
 116         struct oh323_pvt *next;                                 /* Next channel in list */
 117 } *iflist = NULL;
 118
 119 static struct ast_user_list {
 120         struct oh323_user *users;
 121         ast_mutex_t lock;
 122 } userl = { NULL, AST_MUTEX_INITIALIZER };
 123
 124 static struct ast_peer_list {
 125         struct oh323_peer *peers;
 126         ast_mutex_t lock;
 127 } peerl = { NULL, AST_MUTEX_INITIALIZER };
 128
 129 static struct ast_alias_list {
 130         struct oh323_alias *aliases;
 131         ast_mutex_t lock;
 132 } aliasl = { NULL, AST_MUTEX_INITIALIZER };
 133
 134 /** Asterisk RTP stuff*/
 135 static struct sched_context *sched;
 136 static struct io_context *io;
 137
 138 /** Protect the interface list (of oh323_pvt's) */
 139 static ast_mutex_t iflock = AST_MUTEX_INITIALIZER;
 140
 141 /** Usage counter and associated lock */
 142 static int usecnt =0;
 143 static ast_mutex_t usecnt_lock = AST_MUTEX_INITIALIZER;
 144
 145 /* Protect the monitoring thread, so only one process can kill or start it, and not
 146    when it's doing something critical. */
 147 static ast_mutex_t monlock = AST_MUTEX_INITIALIZER;
 148
 149 /* This is the thread for the monitor which checks for input on the channels
 150    which are not currently in use.  */
 151 static pthread_t monitor_thread = 0;
 152
 153 static int restart_monitor(void);
 154
 155 static void __oh323_destroy(struct oh323_pvt *p)
 156 {
 157         struct oh323_pvt *cur, *prev = NULL;
 158
 159         if (p->rtp) {
 160                 ast_rtp_destroy(p->rtp);
 161         }
 162
 163         /* Unlink us from the owner if we have one */
 164         if (p->owner) {
 165                 ast_mutex_lock(&p->owner->lock);
 166                 ast_log(LOG_DEBUG, "Detaching from %s\n", p->owner->name);
 167                 p->owner->pvt->pvt = NULL;
 168                 ast_mutex_unlock(&p->owner->lock);
 169         }
 170         cur = iflist;
 171         while(cur) {
 172                 if (cur == p) {
 173                         if (prev)
 174                                 prev->next = cur->next;
 175                         else
 176                                 iflist = cur->next;
 177                         break;
 178                 }
 179                 prev = cur;
 180                 cur = cur->next;
 181         }
 182         if (!cur) {
 183                 ast_log(LOG_WARNING, "%p is not in list?!?! \n", cur);
 184         } else
 185                 free(p);
 186 }
 187
 188 static void oh323_destroy(struct oh323_pvt *p)
 189 {
 190         ast_mutex_lock(&iflock);
 191         __oh323_destroy(p);
 192         ast_mutex_unlock(&iflock);
 193 }
 194
 195 static struct oh323_alias *build_alias(char *name, struct ast_variable *v)
 196 {
 197         struct oh323_alias *alias;
 198
 199         alias = (struct oh323_alias *)malloc(sizeof(struct oh323_alias));
 200
 201         if (alias) {
 202                 memset(alias, 0, sizeof(struct oh323_alias));
 203                 strncpy(alias->name, name, sizeof(alias->name)-1);
 204
 205                 while (v) {
 206                         if (!strcasecmp(v->name, "e164")) {
 207                                 strncpy(alias->e164,  v->value, sizeof(alias->e164)-1);
 208                         } else if (!strcasecmp(v->name, "prefix")) {
 209                                 strncpy(alias->prefix,  v->value, sizeof(alias->prefix)-1);
 210                         } else if (!strcasecmp(v->name, "context")) {
 211                                 strncpy(alias->context,  v->value, sizeof(alias->context)-1);
 212                         } else if (!strcasecmp(v->name, "secret")) {
 213                                 strncpy(alias->secret,  v->value, sizeof(alias->secret)-1);
 214                         } else {
 215                                 if (strcasecmp(v->value, "h323")) {
 216                                         ast_log(LOG_WARNING, "Keyword %s does not make sense in type=h323\n", v->value);
 217                                 }
 218                         }
 219                         v = v->next;
 220                 }
 221         }
 222         return alias;
 223 }
 224
 225 static struct oh323_user *build_user(char *name, struct ast_variable *v)
 226 {
 227         struct oh323_user *user;
 228         int format;
 229
 230         user = (struct oh323_user *)malloc(sizeof(struct oh323_user));
 231         if (user) {
 232                 memset(user, 0, sizeof(struct oh323_user));
 233                 strncpy(user->name, name, sizeof(user->name)-1);
 234
 235                 /* set the usage flag to a sane starting value*/
 236                 user->inUse = 0;
 237                 /* Assume we can native bridge */
 238                 user->bridge = bridge_default;
 239
 240                 while(v) {
 241                         if (!strcasecmp(v->name, "context")) {
 242                                 strncpy(user->context, v->value, sizeof(user->context)-1);
 243                         } else if (!strcasecmp(v->name, "bridge")) {
 244                                 user->bridge = ast_true(v->value);
 245                       } else if (!strcasecmp(v->name, "nat")) {
 246                               user->nat = ast_true(v->value);
 247                         } else if (!strcasecmp(v->name, "noFastStart")) {
 248                                 user->noFastStart = ast_true(v->value);
 249                         } else if (!strcasecmp(v->name, "noH245Tunneling")) {
 250                                 user->noH245Tunneling = ast_true(v->value);
 251                         } else if (!strcasecmp(v->name, "noSilenceSuppression")) {
 252                                 user->noSilenceSuppression = ast_true(v->value);
 253                         } else if (!strcasecmp(v->name, "secret")) {
 254                                 strncpy(user->secret, v->value, sizeof(user->secret)-1);
 255                         } else if (!strcasecmp(v->name, "callerid")) {
 256                                 strncpy(user->callerid, v->value, sizeof(user->callerid)-1);
 257                         } else if (!strcasecmp(v->name, "accountcode")) {
 258                                 strncpy(user->accountcode, v->value, sizeof(user->accountcode)-1);
 259                         } else if (!strcasecmp(v->name, "incominglimit")) {
 260                                 user->incominglimit = atoi(v->value);
 261                                 if (user->incominglimit < 0)
 262                                         user->incominglimit = 0;
 263                         } else if (!strcasecmp(v->name, "host")) {
 264                                 if (!strcasecmp(v->value, "dynamic")) {
 265                                         ast_log(LOG_ERROR, "Dynamic host configuration not implemented, yet!\n");
 266                                         free(user);
 267                                         return NULL;
 268                                 } else if (ast_get_ip(&user->addr, v->value)) {
 269                                         free(user);
 270                                         return NULL;
 271                                 }
 272                                 /* Let us know we need to use ip authentication */
 273                                 user->host = 1;
 274                         } else if (!strcasecmp(v->name, "amaflags")) {
 275                                 format = ast_cdr_amaflags2int(v->value);
 276                                 if (format < 0) {
 277                                         ast_log(LOG_WARNING, "Invalid AMA Flags: %s at line %d\n", v->value, v->lineno);
 278                                 } else {
 279                                         user->amaflags = format;
 280                                 }
 281                         }
 282                         v = v->next;
 283                 }
 284         }
 285         return user;
 286 }
 287
 288
 289 static struct oh323_peer *build_peer(char *name, struct ast_variable *v)
 290 {
 291         struct oh323_peer *peer;
 292         struct oh323_peer *prev;
 293         int found=0;
 294
 295         prev = NULL;
 296         ast_mutex_lock(&peerl.lock);
 297         peer = peerl.peers;
 298
 299         while(peer) {
 300                 if (!strcasecmp(peer->name, name)) {
 301                         break;
 302                 }
 303                 prev = peer;
 304                 peer = peer->next;
 305         }
 306
 307         if (peer) {
 308                 found++;
 309                 /* Already in the list, remove it and it will be added back (or FREE'd) */
 310                 if (prev) {
 311                         prev->next = peer->next;
 312                 } else {
 313                         peerl.peers = peer->next;
 314                 }
 315                 ast_mutex_unlock(&peerl.lock);
 316         } else {
 317                 ast_mutex_unlock(&peerl.lock);
 318                 peer = malloc(sizeof(struct oh323_peer));
 319                 memset(peer, 0, sizeof(struct oh323_peer));
 320         }
 321         if (peer) {
 322                 if (!found) {
 323                         strncpy(peer->name, name, sizeof(peer->name)-1);
 324                 }
 325
 326                 /* set the usage flag to a sane starting value*/
 327                 peer->inUse = 0;
 328
 329                 while(v) {
 330                         if (!strcasecmp(v->name, "context")) {
 331                                 strncpy(peer->context, v->value, sizeof(peer->context)-1);
 332                         }  else if (!strcasecmp(v->name, "bridge")) {
 333                                 peer->bridge = ast_true(v->value);
 334                         } else if (!strcasecmp(v->name, "noFastStart")) {
 335                                 peer->noFastStart = ast_true(v->value);
 336                         } else if (!strcasecmp(v->name, "noH245Tunneling")) {
 337                                 peer->noH245Tunneling = ast_true(v->value);
 338                         } else if (!strcasecmp(v->name, "noSilenceSuppression")) {
 339                                 peer->noSilenceSuppression = ast_true(v->value);
 340                         } else if (!strcasecmp(v->name, "outgoinglimit")) {
 341                                 peer->outgoinglimit = atoi(v->value);
 342                                 if (peer->outgoinglimit > 0)
 343                                         peer->outgoinglimit = 0;
 344                         } else if (!strcasecmp(v->name, "host")) {
 345                                 if (!strcasecmp(v->value, "dynamic")) {
 346                                         ast_log(LOG_ERROR, "Dynamic host configuration not implemented, yet!\n");
 347                                         free(peer);
 348                                         return NULL;
 349                                 }
 350                                 if (ast_get_ip(&peer->addr, v->value)) {
 351                                                 free(peer);
 352                                                 return NULL;
 353                                 }
 354                         }
 355                         v=v->next;
 356                 }
 357         }
 358         return peer;
 359 }
 360
 361
 362
 363 /**
 364  * Send (play) the specified digit to the channel.
 365  *
 366  */
 367 static int oh323_digit(struct ast_channel *c, char digit)
 368 {
 369         struct oh323_pvt *p = c->pvt->pvt;
 370         if (p && p->rtp && (p->dtmfmode & H323_DTMF_RFC2833)) {
 371                 ast_rtp_senddigit(p->rtp, digit);
 372         }
 373         /* If in-band DTMF is desired, send that */
 374         if (p->dtmfmode & H323_DTMF_INBAND)
 375                 h323_send_tone(p->cd.call_token, digit);
 376         return 0;
 377 }
 378
 379
 380 /**
 381  * Make a call over the specified channel to the specified
 382  * destination. This function will parse the destination string
 383  * and determine the address-number to call.
 384  * Return -1 on error, 0 on success.
 385  */
 386 static int oh323_call(struct ast_channel *c, char *dest, int timeout)
 387 {
 388         int res;
 389         struct oh323_pvt *p = c->pvt->pvt;
 390         char called_addr[256];
 391         char *tmp;
 392
 393         strtok_r(dest, "/", &(tmp));
 394
 395         ast_log(LOG_DEBUG, "dest=%s, timeout=%d.\n", dest, timeout);
 396
 397         if ((c->_state != AST_STATE_DOWN) && (c->_state != AST_STATE_RESERVED)) {
 398                 ast_log(LOG_WARNING, "Line is already in use (%s)\n", c->name);
 399                 return -1;
 400         }
 401
 402         /* outgoing call */
 403         p->outgoing = 1;
 404
 405         /* Clear the call token */
 406         if ((p->cd).call_token == NULL)
 407                 (p->cd).call_token = (char *)malloc(128);
 408
 409         memset((char *)(p->cd).call_token, 0, 128);
 410
 411         if (p->cd.call_token == NULL) {
 412                 ast_log(LOG_ERROR, "Not enough memory.\n");
 413                 return -1;
 414         }
 415
 416         /* Build the address to call */
 417         memset(called_addr, 0, sizeof(dest));
 418         memcpy(called_addr, dest, sizeof(called_addr));
 419
 420         /* Copy callerid, if there is any */
 421         if (c->callerid) {
 422                 char *tmp = strchr(c->callerid, '"');
 423                 if (!tmp) {
 424                         p->calloptions.callerid = malloc(80); // evil
 425                         // sprintf(p->calloptions.callerid, "\"%s\"", c->callerid);
 426                         sprintf(p->calloptions.callerid, "\"\" <%s>", c->callerid);
 427                 } else {
 428                         p->calloptions.callerid = strdup(c->callerid);
 429                 }
 430          }
 431
 432         res = h323_make_call(called_addr, &(p->cd), p->calloptions);
 433
 434         if (res) {
 435                 ast_log(LOG_NOTICE, "h323_make_call failed(%s)\n", c->name);
 436                 return -1;
 437         }
 438
 439         ast_setstate(c, AST_STATE_RINGING);
 440         return 0;
 441 }
 442
 443
 444 static int oh323_answer(struct ast_channel *c)
 445 {
 446         int res;
 447
 448         struct oh323_pvt *p = c->pvt->pvt;
 449
 450         res = h323_answering_call(p->cd.call_token, 0);
 451
 452         if (c->_state != AST_STATE_UP)
 453                 ast_setstate(c, AST_STATE_UP);
 454
 455         return res;
 456 }
 457
 458 static int oh323_hangup(struct ast_channel *c)
 459 {
 460         struct oh323_pvt *p = c->pvt->pvt;
 461         int needcancel = 0;
 462         if (h323debug)
 463                 ast_log(LOG_DEBUG, "oh323_hangup(%s)\n", c->name);
 464         if (!c->pvt->pvt) {
 465                 ast_log(LOG_DEBUG, "Asked to hangup channel not connected\n");
 466                 return 0;
 467         }
 468         ast_mutex_lock(&p->lock);
 469         /* Determine how to disconnect */
 470         if (p->owner != c) {
 471                 ast_log(LOG_WARNING, "Huh?  We aren't the owner?\n");
 472                 ast_mutex_unlock(&p->lock);
 473                 return 0;
 474         }
 475         if (!c || (c->_state != AST_STATE_UP))
 476                 needcancel = 1;
 477         /* Disconnect */
 478         p = c->pvt->pvt;
 479
 480         /* Free dsp used for in-band DTMF detection */
 481         if (p->vad) {
 482                 ast_dsp_free(p->vad);
 483      }
 484
 485         p->owner = NULL;
 486         c->pvt->pvt = NULL;
 487
 488         /* Start the process if it's not already started */
 489         if (!p->alreadygone) {
 490                 p->needdestroy = 1;
 491         }
 492
 493        /* Tell the H.323 stack to cleanly tare down the call */
 494        if (h323_clear_call((p->cd).call_token)) {
 495                ast_log(LOG_DEBUG, "ClearCall failed.\n");
 496        }
 497
 498         /* Update usage counter */
 499         ast_mutex_lock(&usecnt_lock);
 500         usecnt--;
 501         if (usecnt < 0)
 502                 ast_log(LOG_WARNING, "Usecnt < 0\n");
 503         ast_mutex_unlock(&usecnt_lock);
 504         ast_update_use_count();
 505
 506         ast_mutex_unlock(&p->lock);
 507         return 0;
 508 }
 509
 510 static struct ast_frame *oh323_rtp_read(struct oh323_pvt *p)
 511 {
 512         /* Retrieve audio/etc from channel.  Assumes p->lock is already held. */
 513         struct ast_frame *f;
 514         static struct ast_frame null_frame = { AST_FRAME_NULL, };
 515
 516       /* Only apply it for the first packet, we just need the correct ip/port */
 517       if(p->nat)
 518       {
 519               ast_rtp_setnat(p->rtp,p->nat);
 520               p->nat = 0;
 521       }
 522
 523         f = ast_rtp_read(p->rtp);
 524         /* Don't send RFC2833 if we're not supposed to */
 525         if (f && (f->frametype == AST_FRAME_DTMF) && !(p->dtmfmode & H323_DTMF_RFC2833))
 526                 return &null_frame;
 527         if (p->owner) {
 528                 /* We already hold the channel lock */
 529                 if (f->frametype == AST_FRAME_VOICE) {
 530                         if (f->subclass != p->owner->nativeformats) {
 531                                 ast_log(LOG_DEBUG, "Oooh, format changed to %d\n", f->subclass);
 532                                 p->owner->nativeformats = f->subclass;
 533                                 ast_set_read_format(p->owner, p->owner->readformat);
 534                                 ast_set_write_format(p->owner, p->owner->writeformat);
 535                         }
 536
 537                         /* Do in-band DTMF detection */
 538                         if (p->dtmfmode & H323_DTMF_INBAND) {
 539                    f = ast_dsp_process(p->owner,p->vad,f,0);
 540                                    if (f->frametype == AST_FRAME_DTMF)
 541                                         ast_log(LOG_DEBUG, "Got in-band digit %c.\n", f->subclass);
 542             }
 543
 544
 545                 }
 546         }
 547         return f;
 548 }
 549
 550
 551 static struct ast_frame  *oh323_read(struct ast_channel *c)
 552 {
 553         struct ast_frame *fr;
 554         struct oh323_pvt *p = c->pvt->pvt;
 555         ast_mutex_lock(&p->lock);
 556         fr = oh323_rtp_read(p);
 557         ast_mutex_unlock(&p->lock);
 558         return fr;
 559 }
 560
 561 static int oh323_write(struct ast_channel *c, struct ast_frame *frame)
 562 {
 563         struct oh323_pvt *p = c->pvt->pvt;
 564         int res = 0;
 565         if (frame->frametype != AST_FRAME_VOICE) {
 566                 if (frame->frametype == AST_FRAME_IMAGE)
 567                         return 0;
 568                 else {
 569                         ast_log(LOG_WARNING, "Can't send %d type frames with H323 write\n", frame->frametype);
 570                         return 0;
 571                 }
 572         } else {
 573                 if (!(frame->subclass & c->nativeformats)) {
 574                         ast_log(LOG_WARNING, "Asked to transmit frame type %d, while native formats is %d (read/write = %d/%d)\n",
 575                                 frame->subclass, c->nativeformats, c->readformat, c->writeformat);
 576                         return -1;
 577                 }
 578         }
 579         if (p) {
 580                 ast_mutex_lock(&p->lock);
 581                 if (p->rtp) {
 582                         res =  ast_rtp_write(p->rtp, frame);
 583                 }
 584                 ast_mutex_unlock(&p->lock);
 585         }
 586         return res;
 587 }
 588
 589 /** FIXME: Can I acutally use this or does Open H.323 take care of everything? */
 590 static int oh323_indicate(struct ast_channel *c, int condition)
 591 {
 592
 593         struct oh323_pvt *p = c->pvt->pvt;
 594
 595         switch(condition) {
 596         case AST_CONTROL_RINGING:
 597                 if (c->_state == AST_STATE_RING) {
 598                 //      transmit_response(p, "180 Ringing", &p->initreq);
 599                         break;
 600                 }
 601                 return 0;
 602         case AST_CONTROL_BUSY:
 603                 if (c->_state != AST_STATE_UP) {
 604                 //      transmit_response(p, "600 Busy everywhere", &p->initreq);
 605                         p->alreadygone = 1;
 606                         ast_softhangup(c, AST_SOFTHANGUP_DEV);
 607                         break;
 608                 }
 609                 return 0;
 610         case AST_CONTROL_CONGESTION:
 611                 if (c->_state != AST_STATE_UP) {
 612                 //      transmit_response(p, "486 Busy here", &p->initreq);
 613                         p->alreadygone = 1;
 614                         ast_softhangup(c, AST_SOFTHANGUP_DEV);
 615                         break;
 616                 }
 617                 return 0;
 618         case -1:
 619                 return -1;
 620         default:
 621                 ast_log(LOG_WARNING, "Don't know how to indicate condition %d\n", condition);
 622                 return -1;
 623         }
 624         return 0;
 625 }
 626
 627 // FIXME: WTF is this? Do I need this???
 628 static int oh323_fixup(struct ast_channel *oldchan, struct ast_channel *newchan)
 629 {
 630         struct oh323_pvt *p = newchan->pvt->pvt;
 631
 632         ast_mutex_lock(&p->lock);
 633         if (p->owner != oldchan) {
 634                 ast_log(LOG_WARNING, "old channel wasn't %p but was %p\n", oldchan, p->owner);
 635                 return -1;
 636         }
 637         p->owner = newchan;
 638         ast_mutex_unlock(&p->lock);
 639         return 0;
 640 }
 641
 642 static struct ast_channel *oh323_new(struct oh323_pvt *i, int state, const char *host)
 643 {
 644         struct ast_channel *ch;
 645         int fmt;
 646         ch = ast_channel_alloc(1);
 647
 648         if (ch) {
 649
 650                 snprintf(ch->name, sizeof(ch->name)-1, "H323/%s", host);
 651                 ch->nativeformats = i->capability;
 652                 if (!ch->nativeformats)
 653                         ch->nativeformats = capability;
 654                 fmt = ast_best_codec(ch->nativeformats);
 655                 ch->type = type;
 656                 ch->fds[0] = ast_rtp_fd(i->rtp);
 657                 ast_setstate(ch, state);
 658
 659                 if (state == AST_STATE_RING)
 660                         ch->rings = 1;
 661
 662                 ch->writeformat = fmt;
 663                 ch->pvt->rawwriteformat = fmt;
 664                 ch->readformat = fmt;
 665                 ch->pvt->rawreadformat = fmt;
 666
 667                 /* Allocate dsp for in-band DTMF support */
 668                 if (i->dtmfmode & H323_DTMF_INBAND) {
 669                         i->vad = ast_dsp_new();
 670                         ast_dsp_set_features(i->vad, DSP_FEATURE_DTMF_DETECT);
 671                 }
 672
 673                 /* Register the OpenH323 channel's functions. */
 674                 ch->pvt->pvt = i;
 675                 ch->pvt->send_digit = oh323_digit;
 676                 ch->pvt->call = oh323_call;
 677                 ch->pvt->hangup = oh323_hangup;
 678                 ch->pvt->answer = oh323_answer;
 679                 ch->pvt->read = oh323_read;
 680                 ch->pvt->write = oh323_write;
 681                 ch->pvt->indicate = oh323_indicate;
 682                 ch->pvt->fixup = oh323_fixup;
 683 //              ch->pvt->bridge = ast_rtp_bridge;
 684
 685                 /*  Set the owner of this channel */
 686                 i->owner = ch;
 687
 688                 ast_mutex_lock(&usecnt_lock);
 689                 usecnt++;
 690                 ast_mutex_unlock(&usecnt_lock);
 691                 ast_update_use_count();
 692                 strncpy(ch->context, i->context, sizeof(ch->context)-1);
 693                 strncpy(ch->exten, i->exten, sizeof(ch->exten)-1);
 694                 ch->priority = 1;
 695                 if (strlen(i->callerid))
 696                         ch->callerid = strdup(i->callerid);
 697                 if (strlen(i->accountcode))
 698                         strncpy(ch->accountcode, i->accountcode, sizeof(ch->accountcode)-1);
 699                 if (i->amaflags)
 700                         ch->amaflags = i->amaflags;
 701                 if (state != AST_STATE_DOWN) {
 702                         if (ast_pbx_start(ch)) {
 703                                 ast_log(LOG_WARNING, "Unable to start PBX on %s\n", ch->name);
 704                                 ast_hangup(ch);
 705                                 ch = NULL;
 706                         }
 707                 }
 708         } else
 709                 ast_log(LOG_WARNING, "Unable to allocate channel structure\n");
 710         return ch;
 711 }
 712
 713 static struct oh323_pvt *oh323_alloc(int callid)
 714 {
 715         struct oh323_pvt *p;
 716
 717         p = malloc(sizeof(struct oh323_pvt));
 718         if (!p) {
 719                 ast_log(LOG_ERROR, "Couldn't allocate private structure. This is bad\n");
 720                 return NULL;
 721         }
 722
 723         /* Keep track of stuff */
 724         memset(p, 0, sizeof(struct oh323_pvt));
 725         p->rtp = ast_rtp_new(sched, io, 1, 0);
 726
 727         if (!p->rtp) {
 728                 ast_log(LOG_WARNING, "Unable to create RTP session: %s\n", strerror(errno));
 729                 free(p);
 730                 return NULL;
 731         }
 732         ast_rtp_settos(p->rtp, tos);
 733         ast_mutex_init(&p->lock);
 734
 735         p->cd.call_reference = callid;
 736         p->bridge = bridge_default;
 737
 738         p->dtmfmode = dtmfmode;
 739         if (p->dtmfmode & H323_DTMF_RFC2833)
 740                 p->nonCodecCapability |= AST_RTP_DTMF;
 741
 742         /* Add to interface list */
 743         ast_mutex_lock(&iflock);
 744         p->next = iflist;
 745         iflist = p;
 746         ast_mutex_unlock(&iflock);
 747         return p;
 748 }
 749
 750 static struct oh323_pvt *find_call(int call_reference)
 751 {
 752         struct oh323_pvt *p;
 753
 754                 ast_mutex_lock(&iflock);
 755         p = iflist;
 756
 757         while(p) {
 758                 if (p->cd.call_reference == call_reference) {
 759                         /* Found the call */
 760                                                 ast_mutex_unlock(&iflock);
 761                                                 return p;
 762                 }
 763                 p = p->next;
 764         }
 765         ast_mutex_unlock(&iflock);
 766                 return NULL;
 767
 768 }
 769
 770 static struct ast_channel *oh323_request(char *type, int format, void *data)
 771 {
 772
 773         int oldformat;
 774         struct oh323_pvt *p;
 775         struct ast_channel *tmpc = NULL;
 776         char *dest = data;
 777         char *ext, *host;
 778         char *h323id = NULL;
 779         char tmp[256];
 780
 781
 782         ast_log(LOG_DEBUG, "type=%s, format=%d, data=%s.\n", type, format, (char *)data);
 783
 784         oldformat = format;
 785         format &= capability;
 786         if (!format) {
 787                 ast_log(LOG_NOTICE, "Asked to get a channel of unsupported format '%d'\n", format);
 788                 return NULL;
 789         }
 790
 791         strncpy(tmp, dest, sizeof(tmp) - 1);
 792
 793         host = strchr(tmp, '@');
 794         if (host) {
 795                 *host = '\0';
 796                 host++;
 797                 ext = tmp;
 798         } else {
 799                 host = tmp;
 800                 ext = NULL;
 801         }
 802
 803         strtok_r(host, "/", &(h323id));
 804
 805         if (*h323id) {
 806                 h323_set_id(h323id);
 807         }
 808
 809
 810         p = oh323_alloc(0);
 811
 812         if (!p) {
 813                 ast_log(LOG_WARNING, "Unable to build pvt data for '%s'\n", (char *)data);
 814                 return NULL;
 815         }
 816
 817         /* Assign a default capability */
 818         p->capability = capability;
 819
 820         if (p->dtmfmode) {
 821                 if (p->dtmfmode & H323_DTMF_RFC2833)
 822                         p->nonCodecCapability |= AST_RTP_DTMF;
 823                 else
 824                         p->nonCodecCapability &= ~AST_RTP_DTMF;
 825         }
 826
 827
 828         ast_log(LOG_DEBUG, "Host: %s\tUsername: %s\n", host, p->username);
 829
 830         if (ext)
 831                 strncpy(p->username, ext, sizeof(p->username) - 1);
 832         tmpc = oh323_new(p, AST_STATE_DOWN, host);
 833         if (!tmpc)
 834                 oh323_destroy(p);
 835
 836         restart_monitor();
 837
 838         return tmpc;
 839 }
 840
 841 struct oh323_alias *find_alias(const char *source_aliases)
 842 {
 843         struct oh323_alias *a;
 844
 845         a = aliasl.aliases;
 846
 847         while(a) {
 848
 849                 if (!strcasecmp(a->name, source_aliases)) {
 850                         break;
 851                 }
 852                 a = a->next;
 853         }
 854         return a;
 855 }
 856
 857 struct oh323_user *find_user(const call_details_t cd)
 858 {
 859         struct oh323_user *u;
 860
 861         u = userl.users;
 862         if(userbyalias == 1){
 863                 while(u) {
 864                         if (!strcasecmp(u->name, cd.call_source_aliases)) {
 865                                 break;
 866                         }
 867                         u = u->next;
 868                 }
 869
 870         } else {
 871                 while(u) {
 872                         if (!strcasecmp(cd.sourceIp, inet_ntoa(u->addr.sin_addr))) {
 873                                 break;
 874                         }
 875                         u = u->next;
 876                 }
 877
 878
 879         }
 880         return u;
 881
 882 }
 883
 884 struct oh323_peer *find_peer(char *dest_peer)
 885 {
 886         struct oh323_peer *p;
 887
 888         p = peerl.peers;
 889
 890         while(p) {
 891                 if (!strcasecmp(p->name, dest_peer)) {
 892                         break;
 893                 }
 894                 p = p->next;
 895         }
 896         return p;
 897
 898 }
 899
 900 /**
 901   * Callback for sending digits from H.323 up to asterisk
 902   *
 903   */
 904 int send_digit(unsigned call_reference, char digit)
 905 {
 906         struct oh323_pvt *p;
 907         struct ast_frame f;
 908
 909         ast_log(LOG_DEBUG, "Recieved Digit: %c\n", digit);
 910         p = find_call(call_reference);
 911
 912         if (!p) {
 913                 ast_log(LOG_ERROR, "Private structure not found in send_digit.\n");
 914                 return -1;
 915         }
 916         memset(&f, 0, sizeof(f));
 917         f.frametype = AST_FRAME_DTMF;
 918     f.subclass = digit;
 919     f.datalen = 0;
 920     f.samples = 300;
 921         f.offset = 0;
 922         f.data = NULL;
 923     f.mallocd = 0;
 924     f.src = "SEND_DIGIT";
 925
 926         return ast_queue_frame(p->owner, &f, 1);
 927 }
 928
 929 /**
 930   * Call-back function that gets called when any H.323 connection is made
 931   *
 932   * Returns the local RTP information
 933   */
 934 struct rtp_info *create_connection(unsigned call_reference)
 935 {
 936         struct oh323_pvt *p;
 937         struct sockaddr_in us;
 938         struct sockaddr_in them;
 939         struct rtp_info *info;
 940
 941         info = malloc(sizeof(struct rtp_info));
 942
 943         p = find_call(call_reference);
 944
 945         if (!p) {
 946                 ast_log(LOG_ERROR, "Unable to allocate private structure, this is very bad.\n");
 947                 return NULL;
 948         }
 949
 950         /* figure out our local RTP port and tell the H.323 stack about it*/
 951         ast_rtp_get_us(p->rtp, &us);
 952         ast_rtp_get_peer(p->rtp, &them);
 953
 954
 955         info->addr = inet_ntoa(us.sin_addr);
 956         info->port = ntohs(us.sin_port);
 957
 958
 959         return info;
 960 }
 961
 962 /**
 963  *  Call-back function for incoming calls
 964  *
 965  *  Returns 1 on success
 966  */
 967
 968 int setup_incoming_call(call_details_t cd)
 969 {
 970
 971         struct oh323_pvt *p = NULL;
 972         struct ast_channel *c = NULL;
 973         struct oh323_user *user = NULL;
 974         struct oh323_alias *alias = NULL;
 975
 976         /* allocate the call*/
 977         p = oh323_alloc(cd.call_reference);
 978
 979         if (!p) {
 980                 ast_log(LOG_ERROR, "Unable to allocate private structure, this is bad.\n");
 981                 return 0;
 982         }
 983
 984         /* Populate the call details in the private structure */
 985         p->cd.call_token = cd.call_token;
 986         p->cd.call_source_aliases = cd.call_source_aliases;
 987         p->cd.call_dest_alias = cd.call_dest_alias;
 988         p->cd.call_source_e164 = cd.call_source_e164;
 989         p->cd.call_dest_e164 = cd.call_dest_e164;
 990
 991         if (h323debug) {
 992                 ast_verbose(VERBOSE_PREFIX_3 "Setting up Call\n");
 993                 ast_verbose(VERBOSE_PREFIX_3 "     Calling party name:  [%s]\n", p->cd.call_source_aliases);
 994                 ast_verbose(VERBOSE_PREFIX_3 "     Calling party number:  [%s]\n", p->cd.call_source_e164);
 995                 ast_verbose(VERBOSE_PREFIX_3 "     Called  party name:  [%s]\n", p->cd.call_dest_alias);
 996                 ast_verbose(VERBOSE_PREFIX_3 "     Called  party number:  [%s]\n", p->cd.call_dest_e164);
 997         }
 998
 999         /* Decide if we are allowing Gatekeeper routed calls*/
1000         if ((!strcasecmp(cd.sourceIp, gatekeeper)) && (gkroute == -1) && (usingGk == 1)) {
1001
1002                 if (strlen(cd.call_dest_e164)) {
1003                         strncpy(p->exten, cd.call_dest_e164, sizeof(p->exten)-1);
1004                         strncpy(p->context, default_context, sizeof(p->context)-1);
1005                 } else {
1006                         alias = find_alias(cd.call_dest_alias);
1007
1008                         if (!alias) {
1009                                 ast_log(LOG_ERROR, "Call for %s rejected, alias not found\n", cd.call_dest_alias);
1010                                 return 0;
1011                         }
1012                         strncpy(p->exten, alias->name, sizeof(p->exten)-1);
1013                         strncpy(p->context, alias->context, sizeof(p->context)-1);
1014                 }
1015
1016
1017                 sprintf(p->callerid, "%s <%s>", p->cd.call_source_aliases, p->cd.call_source_e164);
1018
1019         } else {
1020                 /* Either this call is not from the Gatekeeper
1021                    or we are not allowing gk routed calls */
1022
1023
1024                 user  = find_user(cd);
1025
1026
1027                 if (!user) {
1028                         sprintf(p->callerid, "%s <%s>", p->cd.call_source_aliases, p->cd.call_source_e164);
1029                         if (strlen(p->cd.call_dest_e164)) {
1030                                 strncpy(p->exten, cd.call_dest_e164, sizeof(p->exten)-1);
1031                         } else {
1032                                 strncpy(p->exten, cd.call_dest_alias, sizeof(p->exten)-1);
1033                         }
1034                         if (!strlen(default_context)) {
1035                                 ast_log(LOG_ERROR, "Call from user '%s' rejected due to no default context\n", p->cd.call_source_aliases);
1036                                 return 0;
1037                         }
1038                         strncpy(p->context, default_context, sizeof(p->context)-1);
1039                         ast_log(LOG_DEBUG, "Sending %s to context [%s]\n", cd.call_source_aliases, p->context);
1040                 } else {
1041                         if (user->host) {
1042                                 if (strcasecmp(cd.sourceIp, inet_ntoa(user->addr.sin_addr))){
1043
1044                                         if(!strlen(default_context)) {
1045                                                 ast_log(LOG_ERROR, "Call from user '%s' rejected due to non-matching IP address of '%s'\n", user->name, cd.sourceIp);
1046                                                 return 0;
1047                                         }
1048
1049                                         strncpy(p->context, default_context, sizeof(p->context)-1);
1050                                         sprintf(p->exten,"i");
1051
1052                                         goto exit;
1053                                 }
1054                         }
1055                         if (user->incominglimit > 0) {
1056                                 if (user->inUse >= user->incominglimit) {
1057                                         ast_log(LOG_ERROR, "Call from user '%s' rejected due to usage limit of %d\n", user->name, user->incominglimit);
1058                                         return 0;
1059                                 }
1060                         }
1061                         strncpy(p->context, user->context, sizeof(p->context)-1);
1062                         p->bridge = user->bridge;
1063                       p->nat = user->nat;
1064
1065                         if (strlen(user->callerid))
1066                                 strncpy(p->callerid, user->callerid, sizeof(p->callerid) - 1);
1067                         else
1068                                 sprintf(p->callerid, "%s <%s>", p->cd.call_source_aliases, p->cd.call_source_e164);
1069
1070                         if (strlen(p->cd.call_dest_e164)) {
1071                                 strncpy(p->exten, cd.call_dest_e164, sizeof(p->exten)-1);
1072                         } else {
1073                                 strncpy(p->exten, cd.call_dest_alias, sizeof(p->exten)-1);
1074                         }
1075                         if (strlen(user->accountcode)) {
1076                                 strncpy(p->accountcode, user->accountcode, sizeof(p->accountcode)-1);
1077                         }
1078
1079                         /* Increment the usage counter */
1080                         user->inUse++;
1081                 }
1082         }
1083
1084 /* I know this is horrid, don't kill me saddam */
1085 exit:
1086         /* allocate a channel and tell asterisk about it */
1087         c = oh323_new(p, AST_STATE_RINGING, cd.call_token);
1088         if (!c) {
1089                 ast_log(LOG_ERROR, "Couldn't create channel. This is bad\n");
1090                 return 0;
1091         }
1092
1093         return 1;
1094 }
1095
1096 /**
1097  * Call-back function to establish an outgoing H.323 call
1098  *
1099  * Returns 1 on success
1100  */
1101 int setup_outgoing_call(call_details_t cd)
1102 {
1103         return 1;
1104 }
1105
1106 #if 0
1107 if (p->inUse >= p->outgoinglimit) {
1108         ast_log(LOG_ERROR, "Call to %s rejected due to usage limit of %d outgoing channels\n", p->name, p->inUse);
1109         return 0;
1110 }
1111
1112 if (!p) {
1113         ast_log(LOG_ERROR, "Rejecting call: peer %s not found\n", dest_peer);
1114         return 0;
1115 }
1116 #endif
1117
1118 /**
1119   * Call-back function that gets called for each rtp channel opened
1120   *
1121   * Returns nothing
1122   */
1123 void setup_rtp_connection(unsigned call_reference, const char *remoteIp, int remotePort)
1124 {
1125         struct oh323_pvt *p = NULL;
1126         struct sockaddr_in them;
1127
1128         /* Find the call or allocate a private structure if call not found */
1129         p = find_call(call_reference);
1130
1131         if (!p) {
1132                 ast_log(LOG_ERROR, "Something is wrong: rtp\n");
1133                 return;
1134         }
1135
1136         them.sin_family = AF_INET;
1137         them.sin_addr.s_addr = inet_addr(remoteIp); // only works for IPv4
1138         them.sin_port = htons(remotePort);
1139         ast_rtp_set_peer(p->rtp, &them);
1140
1141         return;
1142 }
1143
1144 /**
1145   *     Call-back function to signal asterisk that the channel has been answered
1146   * Returns nothing
1147   */
1148 void connection_made(unsigned call_reference)
1149 {
1150         struct ast_channel *c = NULL;
1151         struct oh323_pvt *p = NULL;
1152
1153         p = find_call(call_reference);
1154
1155         if (!p)
1156                 ast_log(LOG_ERROR, "Something is wrong: connection\n");
1157
1158
1159         if (!p->owner) {
1160                 ast_log(LOG_ERROR, "Channel has no owner\n");
1161                 return;
1162         }
1163         c = p->owner;
1164
1165         ast_setstate(c, AST_STATE_UP);
1166         return;
1167 }
1168
1169 /**
1170   * Call-back function to cleanup communication
1171   * Returns nothing,
1172   */
1173 void cleanup_connection(call_details_t cd)
1174 {
1175         struct oh323_pvt *p = NULL;
1176 //      struct oh323_peer *peer = NULL;
1177         struct oh323_user *user = NULL;
1178         struct ast_rtp *rtp = NULL;
1179
1180         ast_log(LOG_DEBUG, "Cleaning up our mess\n");
1181
1182         p = find_call(cd.call_reference);
1183
1184         if (!p) {
1185                 return;
1186         }
1187
1188         /* Decrement usage counter */
1189         if (!p->outgoing) {
1190                 user = find_user(cd);
1191
1192                 if(user)
1193                         user->inUse--;
1194         }
1195
1196 #if 0
1197                 if (p->outgoing) {
1198                 peer = find_peer(cd.call_dest_alias);
1199                 peer->inUse--;
1200         } else {
1201                 user = find_user(cd);
1202                 user->inUse--;
1203         }
1204 #endif
1205
1206         if (p->rtp) {
1207                 rtp = p->rtp;
1208                 p->rtp = NULL;
1209                 /* Immediately stop RTP */
1210                 ast_rtp_destroy(rtp);
1211         }
1212
1213         p->alreadygone = 1;
1214
1215         /* Send hangup */
1216         if (p->owner)
1217                 ast_queue_hangup(p->owner, 1);
1218
1219         p = NULL;
1220         return;
1221 }
1222
1223 static void *do_monitor(void *data)
1224 {
1225         int res;
1226         struct oh323_pvt *oh323 = NULL;
1227
1228                 for(;;) {
1229                 /* Check for interfaces needing to be killed */
1230                 ast_mutex_lock(&iflock);
1231 restartsearch:
1232                 oh323 = iflist;
1233                 while(oh323) {
1234                         if (oh323->needdestroy) {
1235                                 __oh323_destroy(oh323);
1236                                 goto restartsearch;
1237                         }
1238                         oh323 = oh323->next;
1239                 }
1240                 ast_mutex_unlock(&iflock);
1241
1242                 /* Wait for sched or io */
1243                 res = ast_sched_wait(sched);
1244                 if ((res < 0) || (res > 1000))
1245                         res = 1000;
1246                 res = ast_io_wait(io, res);
1247
1248                 /* Check for thread cancellation */
1249                 pthread_testcancel();
1250
1251                 ast_mutex_lock(&monlock);
1252                 if (res >= 0)
1253                         ast_sched_runq(sched);
1254                 ast_mutex_unlock(&monlock);
1255         }
1256         /* Never reached */
1257         return NULL;
1258
1259 }
1260
1261 static int restart_monitor(void)
1262 {
1263         /* If we're supposed to be stopped -- stay stopped */
1264         if (monitor_thread == -2)
1265                 return 0;
1266         if (ast_mutex_lock(&monlock)) {
1267                 ast_log(LOG_WARNING, "Unable to lock monitor\n");
1268                 return -1;
1269         }
1270         if (monitor_thread == pthread_self()) {
1271                 ast_mutex_unlock(&monlock);
1272                 ast_log(LOG_WARNING, "Cannot kill myself\n");
1273                 return -1;
1274         }
1275         if (monitor_thread) {
1276                 /* Wake up the thread */
1277                 pthread_kill(monitor_thread, SIGURG);
1278         } else {
1279                 /* Start a new monitor */
1280                 if (pthread_create(&monitor_thread, NULL, do_monitor, NULL) < 0) {
1281                         ast_mutex_unlock(&monlock);
1282                         ast_log(LOG_ERROR, "Unable to start monitor thread.\n");
1283                         return -1;
1284                 }
1285         }
1286         ast_mutex_unlock(&monlock);
1287         return 0;
1288 }
1289
1290 static int h323_do_trace(int fd, int argc, char *argv[])
1291 {
1292         if (argc != 3)
1293                 return RESULT_SHOWUSAGE;
1294
1295         h323_debug(1, atoi(argv[2]));
1296         ast_cli(fd, "H.323 trace set to level %s\n", argv[2]);
1297         return RESULT_SUCCESS;
1298 }
1299
1300 static int h323_no_trace(int fd, int argc, char *argv[])
1301 {
1302         if (argc != 3)
1303                 return RESULT_SHOWUSAGE;
1304
1305         h323_debug(0,0);
1306         ast_cli(fd, "H.323 trace disabled\n");
1307         return RESULT_SUCCESS;
1308 }
1309
1310 static int h323_do_debug(int fd, int argc, char *argv[])
1311 {
1312         if (argc != 2)
1313                 return RESULT_SHOWUSAGE;
1314
1315         h323debug = 1;
1316         ast_cli(fd, "H323 debug enabled\n");
1317         return RESULT_SUCCESS;
1318 }
1319
1320 static int h323_no_debug(int fd, int argc, char *argv[])
1321 {
1322         if (argc != 3)
1323                 return RESULT_SHOWUSAGE;
1324
1325         h323debug = 0;
1326         ast_cli(fd, "H323 Debug disabled\n");
1327         return RESULT_SUCCESS;
1328 }
1329
1330 static int h323_gk_cycle(int fd, int argc, char *argv[])
1331 {
1332         if (argc != 3)
1333                 return RESULT_SHOWUSAGE;
1334
1335         h323_gk_urq();
1336
1337         /* Possibly register with a GK */
1338         if (gatekeeper_disable == 0) {
1339                 if (h323_set_gk(gatekeeper_discover, gatekeeper, secret)) {
1340                         ast_log(LOG_ERROR, "Gatekeeper registration failed.\n");
1341                         h323_end_process();
1342                 }
1343         }
1344
1345         return RESULT_SUCCESS;
1346 }
1347
1348
1349 static char trace_usage[] =
1350 "Usage: h.323 trace <level num>\n"
1351 "       Enables H.323 stack tracing for debugging purposes\n";
1352
1353 static char no_trace_usage[] =
1354 "Usage: h.323 no trace\n"
1355 "       Disables H.323 stack tracing for debugging purposes\n";
1356
1357 static char debug_usage[] =
1358 "Usage: h.323 debug\n"
1359 "       Enables chan_h323 debug output\n";
1360
1361 static char no_debug_usage[] =
1362 "Usage: h.323 no debug\n"
1363 "       Disables chan_h323 debug output\n";
1364
1365 static char show_codec_usage[] =
1366 "Usage: h.323 show codec\n"
1367 "       Shows all enabled codecs\n";
1368
1369 static char show_cycle_usage[] =
1370 "Usage: h.323 gk cycle\n"
1371 "       Manually re-register with the Gatekeper\n";
1372
1373
1374 static struct ast_cli_entry  cli_trace =
1375         { { "h.323", "trace", NULL }, h323_do_trace, "Enable H.323 Stack Tracing", trace_usage };
1376 static struct ast_cli_entry  cli_no_trace =
1377         { { "h.323", "no", "trace", NULL }, h323_no_trace, "Disable H.323 Stack Tracing", no_trace_usage };
1378 static struct ast_cli_entry  cli_debug =
1379         { { "h.323", "debug", NULL }, h323_do_debug, "Enable chan_h323 debug", debug_usage };
1380 static struct ast_cli_entry  cli_no_debug =
1381         { { "h.323", "no", "debug", NULL }, h323_no_debug, "Disable chan_h323 debug", no_debug_usage };
1382 static struct ast_cli_entry  cli_show_codecs =
1383         { { "h.323", "show", "codecs", NULL }, h323_show_codec, "Show enabled codecs", show_codec_usage };
1384 static struct ast_cli_entry  cli_gk_cycle =
1385         { { "h.323", "gk", "cycle", NULL }, h323_gk_cycle, "Manually re-register with the Gatekeper", show_cycle_usage };
1386
1387
1388
1389 int reload_config(void)
1390 {
1391
1392         int format;
1393         struct ast_config *cfg;
1394         struct ast_variable *v;
1395         struct oh323_peer *peer   = NULL;
1396         struct oh323_user *user   = NULL;
1397         struct oh323_alias *alias = NULL;
1398         struct hostent *hp;
1399         char *cat;
1400     char *utype;
1401
1402         cfg = ast_load(config);
1403
1404         /* We *must* have a config file otherwise stop immediately */
1405         if (!cfg) {
1406                 ast_log(LOG_NOTICE, "Unable to load config %s, H.323 disabled\n", config);
1407                 return 1;
1408         }
1409
1410        /* fire up the H.323 Endpoint */
1411         if (!h323_end_point_exist()) {
1412                h323_end_point_create();
1413         }
1414         h323debug=0;
1415         dtmfmode = H323_DTMF_RFC2833;
1416
1417         memset(&bindaddr, 0, sizeof(bindaddr));
1418
1419         v = ast_variable_browse(cfg, "general");
1420         while(v) {
1421                 /* Create the interface list */
1422                 if (!strcasecmp(v->name, "port")) {
1423                         port = (int)strtol(v->value, NULL, 10);
1424                 } else if (!strcasecmp(v->name, "bindaddr")) {
1425                         if (!(hp = gethostbyname(v->value))) {
1426                                 ast_log(LOG_WARNING, "Invalid address: %s\n", v->value);
1427                         } else {
1428                                 memcpy(&bindaddr.sin_addr, hp->h_addr, sizeof(bindaddr.sin_addr));
1429                         }
1430                 } else if (!strcasecmp(v->name, "allow")) {
1431                         format = ast_getformatbyname(v->value);
1432                         if (format < 1)
1433                                 ast_log(LOG_WARNING, "Cannot allow unknown format '%s'\n", v->value);
1434                         else
1435                                 capability |= format;
1436                 } else if (!strcasecmp(v->name, "disallow")) {
1437                         format = ast_getformatbyname(v->value);
1438                         if (format < 1)
1439                                 ast_log(LOG_WARNING, "Cannot disallow unknown format '%s'\n", v->value);
1440                         else
1441                                 capability &= ~format;
1442                 } else if (!strcasecmp(v->name, "tos")) {
1443                         if (sscanf(v->value, "%i", &format) == 1)
1444                                 tos = format & 0xff;
1445                         else if (!strcasecmp(v->value, "lowdelay"))
1446                                 tos = IPTOS_LOWDELAY;
1447                         else if (!strcasecmp(v->value, "throughput"))
1448                                 tos = IPTOS_THROUGHPUT;
1449                         else if (!strcasecmp(v->value, "reliability"))
1450                                 tos = IPTOS_RELIABILITY;
1451                         else if (!strcasecmp(v->value, "mincost"))
1452                                 tos = IPTOS_MINCOST;
1453                         else if (!strcasecmp(v->value, "none"))
1454                                 tos = 0;
1455                         else
1456                                 ast_log(LOG_WARNING, "Invalid tos value at line %d, should be 'lowdelay', 'throughput', 'reliability', 'mincost', or 'none'\n", v->lineno);
1457                 } else if (!strcasecmp(v->name, "gatekeeper")) {
1458                         if (!strcasecmp(v->value, "DISABLE")) {
1459                                 gatekeeper_disable = 1;
1460                                 usingGk = 0;
1461                         } else if (!strcasecmp(v->value, "DISCOVER")) {
1462                                 gatekeeper_disable = 0;
1463                                 gatekeeper_discover = 1;
1464                                 usingGk = 1;
1465                         } else {
1466                                 gatekeeper_disable = 0;
1467                                 usingGk = 1;
1468                                 strncpy(gatekeeper, v->value, sizeof(gatekeeper)-1);
1469                         }
1470                 } else if (!strcasecmp(v->name, "secret")) {
1471                                 strncpy(secret, v->value, sizeof(secret)-1);
1472                 } else if (!strcasecmp(v->name, "AllowGKRouted")) {
1473                                 gkroute = ast_true(v->value);
1474                 } else if (!strcasecmp(v->name, "context")) {
1475                         strncpy(default_context, v->value, sizeof(default_context)-1);
1476                         ast_verbose(VERBOSE_PREFIX_3 "  == Setting default context to %s\n", default_context);
1477                 } else if (!strcasecmp(v->name, "dtmfmode")) {
1478                         if (!strcasecmp(v->value, "inband"))
1479                                 dtmfmode=H323_DTMF_INBAND;
1480                         else if (!strcasecmp(v->value, "rfc2833"))
1481                                 dtmfmode = H323_DTMF_RFC2833;
1482                         else {
1483                                 ast_log(LOG_WARNING, "Unknown dtmf mode '%s', using rfc2833\n", v->value);
1484                                 dtmfmode = H323_DTMF_RFC2833;
1485                         }
1486                 } else if (!strcasecmp(v->name, "UserByAlias")) {
1487                         userbyalias = ast_true(v->value);
1488                 } else if (!strcasecmp(v->name, "bridge")) {
1489                         bridge_default = ast_true(v->value);
1490                 }
1491                 v = v->next;
1492         }
1493
1494         cat = ast_category_browse(cfg, NULL);
1495         while(cat) {
1496                 if (strcasecmp(cat, "general")) {
1497                         utype = ast_variable_retrieve(cfg, cat, "type");
1498                         if (utype) {
1499                                 if (!strcasecmp(utype, "user") || !strcasecmp(utype, "friend")) {
1500                                         user = build_user(cat, ast_variable_browse(cfg, cat));
1501                                         if (user) {
1502                                                 ast_mutex_lock(&userl.lock);
1503                                                 user->next = userl.users;
1504                                                 userl.users = user;
1505                                                 ast_mutex_unlock(&userl.lock);
1506                                         }
1507                                 }  else if (!strcasecmp(utype, "peer") || !strcasecmp(utype, "friend")) {
1508                                         peer = build_peer(cat, ast_variable_browse(cfg, cat));
1509                                         if (peer) {
1510                                                 ast_mutex_lock(&peerl.lock);
1511                                                 peer->next = peerl.peers;
1512                                                 peerl.peers = peer;
1513                                                 ast_mutex_unlock(&peerl.lock);
1514                                         }
1515                                 }  else if (!strcasecmp(utype, "h323")) {
1516                                         alias = build_alias(cat, ast_variable_browse(cfg, cat));
1517                                         if (alias) {
1518                                                 ast_mutex_lock(&aliasl.lock);
1519                                                 alias->next = aliasl.aliases;
1520                                                 aliasl.aliases = alias;
1521                                                 ast_mutex_unlock(&aliasl.lock);
1522                                         }
1523                                 } else {
1524                                         ast_log(LOG_WARNING, "Unknown type '%s' for '%s' in %s\n", utype, cat, config);
1525                                 }
1526                         } else
1527                                 ast_log(LOG_WARNING, "Section '%s' lacks type\n", cat);
1528                 }
1529                 cat = ast_category_browse(cfg, cat);
1530         }
1531
1532         /* Register our H.323 aliases if any*/
1533         while (alias) {
1534                 if (h323_set_alias(alias)) {
1535                         ast_log(LOG_ERROR, "Alias %s rejected by endpoint\n", alias->name);
1536                         return -1;
1537                 }
1538                 alias = alias->next;
1539         }
1540
1541         /* Add some capabilities */
1542         if(h323_set_capability(capability, dtmfmode)) {
1543                 ast_log(LOG_ERROR, "Capabilities failure, this is bad.\n");
1544                 return -1;
1545         }
1546         ast_destroy(cfg);
1547
1548         return 0;
1549 }
1550
1551 void delete_users(void)
1552 {
1553         struct oh323_user *user, *userlast;
1554         struct oh323_peer *peer;
1555
1556         /* Delete all users */
1557         ast_mutex_lock(&userl.lock);
1558         for (user=userl.users;user;) {
1559                 userlast = user;
1560                 user=user->next;
1561                 free(userlast);
1562         }
1563         userl.users=NULL;
1564         ast_mutex_unlock(&userl.lock);
1565         ast_mutex_lock(&peerl.lock);
1566         for (peer=peerl.peers;peer;) {
1567                 /* Assume all will be deleted, and we'll find out for sure later */
1568                 peer->delme = 1;
1569                 peer = peer->next;
1570         }
1571         ast_mutex_unlock(&peerl.lock);
1572 }
1573
1574 void delete_aliases(void)
1575 {
1576         struct oh323_alias *alias, *aliaslast;
1577
1578         /* Delete all users */
1579         ast_mutex_lock(&aliasl.lock);
1580         for (alias=aliasl.aliases;alias;) {
1581                 aliaslast = alias;
1582                 alias=alias->next;
1583                 free(aliaslast);
1584         }
1585         aliasl.aliases=NULL;
1586         ast_mutex_unlock(&aliasl.lock);
1587 }
1588
1589 void prune_peers(void)
1590 {
1591         /* Prune peers who still are supposed to be deleted */
1592         struct oh323_peer *peer, *peerlast, *peernext;
1593         ast_mutex_lock(&peerl.lock);
1594         peerlast = NULL;
1595         for (peer=peerl.peers;peer;) {
1596                 peernext = peer->next;
1597                 if (peer->delme) {
1598                         free(peer);
1599                         if (peerlast)
1600                                 peerlast->next = peernext;
1601                         else
1602                                 peerl.peers = peernext;
1603                 } else
1604                         peerlast = peer;
1605                 peer=peernext;
1606         }
1607         ast_mutex_unlock(&peerl.lock);
1608 }
1609
1610 int reload(void)
1611 {
1612         delete_users();
1613         delete_aliases();
1614         prune_peers();
1615
1616         if (strlen(gatekeeper)) {
1617                 h323_gk_urq();
1618         }
1619
1620         reload_config();
1621
1622 #if 0
1623         /* Possibly register with a GK */
1624         if (gatekeeper_disable == 0) {
1625                 if (h323_set_gk(gatekeeper_discover, gatekeeper, secret)) {
1626                         ast_log(LOG_ERROR, "Gatekeeper registration failed.\n");
1627                         h323_end_process();
1628                         return -1;
1629                 }
1630         }
1631 #endif
1632         restart_monitor();
1633         return 0;
1634 }
1635
1636
1637 static struct ast_rtp *oh323_get_rtp_peer(struct ast_channel *chan)
1638 {
1639         struct oh323_pvt *p;
1640         p = chan->pvt->pvt;
1641         if (p && p->rtp && p->bridge) {
1642                 return p->rtp;
1643         }
1644         return NULL;
1645 }
1646
1647 static struct ast_rtp *oh323_get_vrtp_peer(struct ast_channel *chan)
1648 {
1649         return NULL;
1650 }
1651
1652 static char *convertcap(int cap)
1653 {
1654         switch (cap) {
1655         case AST_FORMAT_G723_1:
1656                 return "G.723";
1657         case AST_FORMAT_GSM:
1658                 return "GSM";
1659         case AST_FORMAT_ULAW:
1660                 return "ULAW";
1661         case AST_FORMAT_ALAW:
1662                 return "ALAW";
1663         case AST_FORMAT_ADPCM:
1664                 return "G.728";
1665         case AST_FORMAT_G729A:
1666                 return "G.729";
1667         case AST_FORMAT_SPEEX:
1668                 return "SPEEX";
1669         case AST_FORMAT_ILBC:
1670                 return "ILBC";
1671         default:
1672                 ast_log(LOG_NOTICE, "Don't know how to deal with mode %d\n", cap);
1673                 return NULL;
1674         }
1675
1676 }
1677
1678 static int oh323_set_rtp_peer(struct ast_channel *chan, struct ast_rtp *rtp, struct ast_rtp *vrtp)
1679 {
1680         /* XXX Deal with Video */
1681         struct oh323_pvt *p;
1682         struct sockaddr_in them;
1683         struct sockaddr_in us;
1684         char *mode;
1685
1686         mode = convertcap(chan->writeformat);
1687
1688         if (!rtp) {
1689                 return 0;
1690         }
1691
1692         p = chan->pvt->pvt;
1693         if (!p) {
1694                 ast_log(LOG_ERROR, "No Private Structure, this is bad\n");
1695                 return -1;
1696         }
1697
1698         ast_rtp_get_peer(rtp, &them);
1699         ast_rtp_get_us(rtp, &us);
1700
1701
1702         h323_native_bridge(p->cd.call_token, inet_ntoa(them.sin_addr), mode);
1703
1704         return 0;
1705
1706 }
1707
1708 static struct ast_rtp_protocol oh323_rtp = {
1709         get_rtp_info: oh323_get_rtp_peer,
1710         get_vrtp_info: oh323_get_vrtp_peer,
1711         set_rtp_peer: oh323_set_rtp_peer,
1712 };
1713
1714
1715 int load_module()
1716 {
1717         int res;
1718
1719         res = reload_config();
1720
1721         if (res) {
1722                 return 0;
1723         } else {
1724                 /* Make sure we can register our channel type */
1725                 if (ast_channel_register(type, tdesc, capability, oh323_request)) {
1726                         ast_log(LOG_ERROR, "Unable to register channel class %s\n", type);
1727                         h323_end_process();
1728                         return -1;
1729                 }
1730                 ast_cli_register(&cli_debug);
1731                 ast_cli_register(&cli_no_debug);
1732                 ast_cli_register(&cli_trace);
1733                 ast_cli_register(&cli_no_trace);
1734                 ast_cli_register(&cli_show_codecs);
1735                 ast_cli_register(&cli_gk_cycle);
1736
1737                 oh323_rtp.type = type;
1738                 ast_rtp_proto_register(&oh323_rtp);
1739
1740                 sched = sched_context_create();
1741                 if (!sched) {
1742                         ast_log(LOG_WARNING, "Unable to create schedule context\n");
1743                 }
1744                 io = io_context_create();
1745                 if (!io) {
1746                         ast_log(LOG_WARNING, "Unable to create I/O context\n");
1747                 }
1748
1749                 /* Register our callback functions */
1750                 h323_callback_register(setup_incoming_call,
1751                                                            setup_outgoing_call,
1752                                                            create_connection,
1753                                                            setup_rtp_connection,
1754                                                            cleanup_connection,
1755                                                            connection_made, send_digit);
1756
1757
1758                 /* start the h.323 listener */
1759                 if (h323_start_listener(port, bindaddr)) {
1760                         ast_log(LOG_ERROR, "Unable to create H323 listener.\n");
1761 //                      h323_end_process();
1762                         return -1;
1763                 }
1764
1765                 /* Possibly register with a GK */
1766                 if (gatekeeper_disable == 0) {
1767                         if (h323_set_gk(gatekeeper_discover, gatekeeper, secret)) {
1768                                 ast_log(LOG_ERROR, "Gatekeeper registration failed.\n");
1769 //                              h323_end_process();
1770                                 return 0;
1771                         }
1772                 }
1773                 /* And start the monitor for the first time */
1774                 restart_monitor();
1775         }
1776         return res;
1777 }
1778 int unload_module()
1779 {
1780         struct oh323_pvt *p, *pl;
1781
1782         if (!ast_mutex_lock(&iflock)) {
1783         /* hangup all interfaces if they have an owner */
1784         p = iflist;
1785         while(p) {
1786                 if (p->owner)
1787                         ast_softhangup(p->owner, AST_SOFTHANGUP_APPUNLOAD);
1788                 p = p->next;
1789         }
1790         iflist = NULL;
1791         ast_mutex_unlock(&iflock);
1792         } else {
1793                 ast_log(LOG_WARNING, "Unable to lock the interface list\n");
1794                 return -1;
1795         }
1796
1797         if (!ast_mutex_lock(&iflock)) {
1798                 /* destroy all the interfaces and free their memory */
1799                 p = iflist;
1800                 while(p) {
1801                         pl = p;
1802                         p = p->next;
1803                         /* free associated memory */
1804                         free(pl);
1805                 }
1806                 iflist = NULL;
1807                 ast_mutex_unlock(&iflock);
1808         } else {
1809                 ast_log(LOG_WARNING, "Unable to lock the interface list\n");
1810                 return -1;
1811         }
1812         h323_gk_urq();
1813         h323_end_process();
1814
1815         /* unregister rtp */
1816         ast_rtp_proto_unregister(&oh323_rtp);
1817
1818         /* unregister commands */
1819         ast_cli_unregister(&cli_debug);
1820         ast_cli_unregister(&cli_no_debug);
1821         ast_cli_unregister(&cli_trace);
1822         ast_cli_unregister(&cli_no_trace);
1823         ast_cli_unregister(&cli_show_codecs);
1824         ast_cli_unregister(&cli_gk_cycle);
1825
1826         /* unregister channel type */
1827         ast_channel_unregister(type);
1828
1829         return 0;
1830
1831 }
1832
1833 int usecount()
1834 {
1835         int res;
1836         ast_mutex_lock(&usecnt_lock);
1837         res = usecnt;
1838         ast_mutex_unlock(&usecnt_lock);
1839         return res;
1840 }
1841
1842 char *description()
1843 {
1844         return desc;
1845 }
1846
1847 char *key()
1848 {
1849         return ASTERISK_GPL_KEY;
1850 }
1851
1852
1853
1854