main/udptl.c

   1 /*
   2  * Asterisk -- A telephony toolkit for Linux.
   3  *
   4  * UDPTL support for T.38
   5  *
   6  * Copyright (C) 2005, Steve Underwood, partly based on RTP code which is
   7  * Copyright (C) 1999-2006, Digium, Inc.
   8  *
   9  * Steve Underwood <steveu@coppice.org>
  10  *
  11  * See http://www.asterisk.org for more information about
  12  * the Asterisk project. Please do not directly contact
  13  * any of the maintainers of this project for assistance;
  14  * the project provides a web site, mailing lists and IRC
  15  * channels for your use.
  16  *
  17  * This program is free software, distributed under the terms of
  18  * the GNU General Public License Version 2. See the LICENSE file
  19  * at the top of the source tree.
  20  *
  21  * A license has been granted to Digium (via disclaimer) for the use of
  22  * this code.
  23  */
  24
  25 /*!
  26  * \file
  27  *
  28  * \brief UDPTL support for T.38 faxing
  29  *
  30  *
  31  * \author Mark Spencer <markster@digium.com>,  Steve Underwood <steveu@coppice.org>
  32  *
  33  * \page T38fax_udptl T38 fax passhtrough :: UDPTL
  34  *
  35  * Asterisk supports T.38 fax passthrough. Asterisk will not be a client, server
  36  * or any form of gateway. Currently fax passthrough is only implemented in the
  37  * SIP channel for strict SIP to SIP calls. If you are using chan_local or chan_agent
  38  * as a proxy channel, T.38 passthrough will not work.
  39  *
  40  * UDPTL is handled very much like RTP. It can be reinvited to go directly between
  41  * the endpoints, without involving Asterisk in the media stream.
  42  *
  43  * \b References:
  44  * - chan_sip.c
  45  * - udptl.c
  46  */
  47
  48
  49 #include "asterisk.h"
  50
  51 ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
  52
  53 #include <sys/time.h>
  54 #include <signal.h>
  55 #include <fcntl.h>
  56
  57 #include "asterisk/udptl.h"
  58 #include "asterisk/frame.h"
  59 #include "asterisk/channel.h"
  60 #include "asterisk/acl.h"
  61 #include "asterisk/config.h"
  62 #include "asterisk/lock.h"
  63 #include "asterisk/utils.h"
  64 #include "asterisk/netsock.h"
  65 #include "asterisk/cli.h"
  66 #include "asterisk/unaligned.h"
  67
  68 #define UDPTL_MTU               1200
  69
  70 #if !defined(FALSE)
  71 #define FALSE 0
  72 #endif
  73 #if !defined(TRUE)
  74 #define TRUE (!FALSE)
  75 #endif
  76
  77 static int udptlstart;
  78 static int udptlend;
  79 static int udptldebug;                      /*!< Are we debugging? */
  80 static struct sockaddr_in udptldebugaddr;   /*!< Debug packets to/from this host */
  81 #ifdef SO_NO_CHECK
  82 static int nochecksums;
  83 #endif
  84 static int udptlfectype;
  85 static int udptlfecentries;
  86 static int udptlfecspan;
  87 static int udptlmaxdatagram;
  88
  89 #define LOCAL_FAX_MAX_DATAGRAM      400
  90 #define MAX_FEC_ENTRIES             5
  91 #define MAX_FEC_SPAN                5
  92
  93 #define UDPTL_BUF_MASK              15
  94
  95 typedef struct {
  96         int buf_len;
  97         uint8_t buf[LOCAL_FAX_MAX_DATAGRAM];
  98 } udptl_fec_tx_buffer_t;
  99
 100 typedef struct {
 101         int buf_len;
 102         uint8_t buf[LOCAL_FAX_MAX_DATAGRAM];
 103         int fec_len[MAX_FEC_ENTRIES];
 104         uint8_t fec[MAX_FEC_ENTRIES][LOCAL_FAX_MAX_DATAGRAM];
 105         int fec_span;
 106         int fec_entries;
 107 } udptl_fec_rx_buffer_t;
 108
 109 /*! \brief Structure for an UDPTL session */
 110 struct ast_udptl {
 111         int fd;
 112         char resp;
 113         struct ast_frame f[16];
 114         unsigned char rawdata[8192 + AST_FRIENDLY_OFFSET];
 115         unsigned int lasteventseqn;
 116         int nat;
 117         int flags;
 118         struct sockaddr_in us;
 119         struct sockaddr_in them;
 120         int *ioid;
 121         struct sched_context *sched;
 122         struct io_context *io;
 123         void *data;
 124         ast_udptl_callback callback;
 125         int udptl_offered_from_local;
 126
 127         /*! This option indicates the error correction scheme used in transmitted UDPTL
 128             packets. */
 129         int error_correction_scheme;
 130
 131         /*! This option indicates the number of error correction entries transmitted in
 132             UDPTL packets. */
 133         int error_correction_entries;
 134
 135         /*! This option indicates the span of the error correction entries in transmitted
 136             UDPTL packets (FEC only). */
 137         int error_correction_span;
 138
 139         /*! This option indicates the maximum size of a UDPTL packet that can be accepted by
 140             the remote device. */
 141         int far_max_datagram_size;
 142
 143         /*! This option indicates the maximum size of a UDPTL packet that we are prepared to
 144             accept. */
 145         int local_max_datagram_size;
 146
 147         int verbose;
 148
 149         struct sockaddr_in far;
 150
 151         int tx_seq_no;
 152         int rx_seq_no;
 153         int rx_expected_seq_no;
 154
 155         udptl_fec_tx_buffer_t tx[UDPTL_BUF_MASK + 1];
 156         udptl_fec_rx_buffer_t rx[UDPTL_BUF_MASK + 1];
 157 };
 158
 159 static AST_RWLIST_HEAD_STATIC(protos, ast_udptl_protocol);
 160
 161 static int udptl_rx_packet(struct ast_udptl *s, uint8_t *buf, int len);
 162 static int udptl_build_packet(struct ast_udptl *s, uint8_t *buf, uint8_t *ifp, int ifp_len);
 163
 164 static inline int udptl_debug_test_addr(struct sockaddr_in *addr)
 165 {
 166         if (udptldebug == 0)
 167                 return 0;
 168         if (udptldebugaddr.sin_addr.s_addr) {
 169                 if (((ntohs(udptldebugaddr.sin_port) != 0)
 170                         && (udptldebugaddr.sin_port != addr->sin_port))
 171                         || (udptldebugaddr.sin_addr.s_addr != addr->sin_addr.s_addr))
 172                         return 0;
 173         }
 174         return 1;
 175 }
 176
 177 static int decode_length(uint8_t *buf, int limit, int *len, int *pvalue)
 178 {
 179         if ((buf[*len] & 0x80) == 0) {
 180                 if (*len >= limit)
 181                         return -1;
 182                 *pvalue = buf[*len];
 183                 (*len)++;
 184                 return 0;
 185         }
 186         if ((buf[*len] & 0x40) == 0) {
 187                 if (*len >= limit - 1)
 188                         return -1;
 189                 *pvalue = (buf[*len] & 0x3F) << 8;
 190                 (*len)++;
 191                 *pvalue |= buf[*len];
 192                 (*len)++;
 193                 return 0;
 194         }
 195         if (*len >= limit)
 196                 return -1;
 197         *pvalue = (buf[*len] & 0x3F) << 14;
 198         (*len)++;
 199         /* Indicate we have a fragment */
 200         return 1;
 201 }
 202 /*- End of function --------------------------------------------------------*/
 203
 204 static int decode_open_type(uint8_t *buf, int limit, int *len, const uint8_t **p_object, int *p_num_octets)
 205 {
 206         int octet_cnt;
 207         int octet_idx;
 208         int stat;
 209         int i;
 210         const uint8_t **pbuf;
 211
 212         for (octet_idx = 0, *p_num_octets = 0; ; octet_idx += octet_cnt) {
 213                 if ((stat = decode_length(buf, limit, len, &octet_cnt)) < 0)
 214                         return -1;
 215                 if (octet_cnt > 0) {
 216                         *p_num_octets += octet_cnt;
 217
 218                         pbuf = &p_object[octet_idx];
 219                         i = 0;
 220                         /* Make sure the buffer contains at least the number of bits requested */
 221                         if ((*len + octet_cnt) > limit)
 222                                 return -1;
 223
 224                         *pbuf = &buf[*len];
 225                         *len += octet_cnt;
 226                 }
 227                 if (stat == 0)
 228                         break;
 229         }
 230         return 0;
 231 }
 232 /*- End of function --------------------------------------------------------*/
 233
 234 static int encode_length(uint8_t *buf, int *len, int value)
 235 {
 236         int multiplier;
 237
 238         if (value < 0x80) {
 239                 /* 1 octet */
 240                 buf[*len] = value;
 241                 (*len)++;
 242                 return value;
 243         }
 244         if (value < 0x4000) {
 245                 /* 2 octets */
 246                 /* Set the first bit of the first octet */
 247                 buf[*len] = ((0x8000 | value) >> 8) & 0xFF;
 248                 (*len)++;
 249                 buf[*len] = value & 0xFF;
 250                 (*len)++;
 251                 return value;
 252         }
 253         /* Fragmentation */
 254         multiplier = (value < 0x10000) ? (value >> 14) : 4;
 255         /* Set the first 2 bits of the octet */
 256         buf[*len] = 0xC0 | multiplier;
 257         (*len)++;
 258         return multiplier << 14;
 259 }
 260 /*- End of function --------------------------------------------------------*/
 261
 262 static int encode_open_type(uint8_t *buf, int *len, const uint8_t *data, int num_octets)
 263 {
 264         int enclen;
 265         int octet_idx;
 266         uint8_t zero_byte;
 267
 268         /* If open type is of zero length, add a single zero byte (10.1) */
 269         if (num_octets == 0) {
 270                 zero_byte = 0;
 271                 data = &zero_byte;
 272                 num_octets = 1;
 273         }
 274         /* Encode the open type */
 275         for (octet_idx = 0; ; num_octets -= enclen, octet_idx += enclen) {
 276                 if ((enclen = encode_length(buf, len, num_octets)) < 0)
 277                         return -1;
 278                 if (enclen > 0) {
 279                         memcpy(&buf[*len], &data[octet_idx], enclen);
 280                         *len += enclen;
 281                 }
 282                 if (enclen >= num_octets)
 283                         break;
 284         }
 285
 286         return 0;
 287 }
 288 /*- End of function --------------------------------------------------------*/
 289
 290 static int udptl_rx_packet(struct ast_udptl *s, uint8_t *buf, int len)
 291 {
 292         int stat;
 293         int stat2;
 294         int i;
 295         int j;
 296         int k;
 297         int l;
 298         int m;
 299         int x;
 300         int limit;
 301         int which;
 302         int ptr;
 303         int count;
 304         int total_count;
 305         int seq_no;
 306         const uint8_t *ifp;
 307         const uint8_t *data;
 308         int ifp_len;
 309         int repaired[16];
 310         const uint8_t *bufs[16];
 311         int lengths[16];
 312         int span;
 313         int entries;
 314         int ifp_no;
 315
 316         ptr = 0;
 317         ifp_no = 0;
 318         memset(&s->f[0], 0, sizeof(s->f[0]));
 319
 320         /* Decode seq_number */
 321         if (ptr + 2 > len)
 322                 return -1;
 323         seq_no = (buf[0] << 8) | buf[1];
 324         ptr += 2;
 325
 326         /* Break out the primary packet */
 327         if ((stat = decode_open_type(buf, len, &ptr, &ifp, &ifp_len)) != 0)
 328                 return -1;
 329         /* Decode error_recovery */
 330         if (ptr + 1 > len)
 331                 return -1;
 332         if ((buf[ptr++] & 0x80) == 0) {
 333                 /* Secondary packet mode for error recovery */
 334                 if (seq_no > s->rx_seq_no) {
 335                         /* We received a later packet than we expected, so we need to check if we can fill in the gap from the
 336                            secondary packets. */
 337                         total_count = 0;
 338                         do {
 339                                 if ((stat2 = decode_length(buf, len, &ptr, &count)) < 0)
 340                                         return -1;
 341                                 for (i = 0; i < count; i++) {
 342                                         if ((stat = decode_open_type(buf, len, &ptr, &bufs[total_count + i], &lengths[total_count + i])) != 0)
 343                                                 return -1;
 344                                 }
 345                                 total_count += count;
 346                         }
 347                         while (stat2 > 0);
 348                         /* Step through in reverse order, so we go oldest to newest */
 349                         for (i = total_count; i > 0; i--) {
 350                                 if (seq_no - i >= s->rx_seq_no) {
 351                                         /* This one wasn't seen before */
 352                                         /* Decode the secondary IFP packet */
 353                                         //fprintf(stderr, "Secondary %d, len %d\n", seq_no - i, lengths[i - 1]);
 354                                         s->f[ifp_no].frametype = AST_FRAME_MODEM;
 355                                         s->f[ifp_no].subclass = AST_MODEM_T38;
 356
 357                                         s->f[ifp_no].mallocd = 0;
 358                                         s->f[ifp_no].seqno = seq_no - i;
 359                                         s->f[ifp_no].datalen = lengths[i - 1];
 360                                         s->f[ifp_no].data.ptr = (uint8_t *) bufs[i - 1];
 361                                         s->f[ifp_no].offset = 0;
 362                                         s->f[ifp_no].src = "UDPTL";
 363                                         if (ifp_no > 0)
 364                                                 AST_LIST_NEXT(&s->f[ifp_no - 1], frame_list) = &s->f[ifp_no];
 365                                         AST_LIST_NEXT(&s->f[ifp_no], frame_list) = NULL;
 366                                         ifp_no++;
 367                                 }
 368                         }
 369                 }
 370         }
 371         else
 372         {
 373                 /* FEC mode for error recovery */
 374                 /* Our buffers cannot tolerate overlength IFP packets in FEC mode */
 375                 if (ifp_len > LOCAL_FAX_MAX_DATAGRAM)
 376                         return -1;
 377                 /* Update any missed slots in the buffer */
 378                 for ( ; seq_no > s->rx_seq_no; s->rx_seq_no++) {
 379                         x = s->rx_seq_no & UDPTL_BUF_MASK;
 380                         s->rx[x].buf_len = -1;
 381                         s->rx[x].fec_len[0] = 0;
 382                         s->rx[x].fec_span = 0;
 383                         s->rx[x].fec_entries = 0;
 384                 }
 385
 386                 x = seq_no & UDPTL_BUF_MASK;
 387
 388                 memset(repaired, 0, sizeof(repaired));
 389
 390                 /* Save the new IFP packet */
 391                 memcpy(s->rx[x].buf, ifp, ifp_len);
 392                 s->rx[x].buf_len = ifp_len;
 393                 repaired[x] = TRUE;
 394
 395                 /* Decode the FEC packets */
 396                 /* The span is defined as an unconstrained integer, but will never be more
 397                    than a small value. */
 398                 if (ptr + 2 > len)
 399                         return -1;
 400                 if (buf[ptr++] != 1)
 401                         return -1;
 402                 span = buf[ptr++];
 403                 s->rx[x].fec_span = span;
 404
 405                 /* The number of entries is defined as a length, but will only ever be a small
 406                    value. Treat it as such. */
 407                 if (ptr + 1 > len)
 408                         return -1;
 409                 entries = buf[ptr++];
 410                 s->rx[x].fec_entries = entries;
 411
 412                 /* Decode the elements */
 413                 for (i = 0; i < entries; i++) {
 414                         if ((stat = decode_open_type(buf, len, &ptr, &data, &s->rx[x].fec_len[i])) != 0)
 415                                 return -1;
 416                         if (s->rx[x].fec_len[i] > LOCAL_FAX_MAX_DATAGRAM)
 417                                 return -1;
 418
 419                         /* Save the new FEC data */
 420                         memcpy(s->rx[x].fec[i], data, s->rx[x].fec_len[i]);
 421 #if 0
 422                         fprintf(stderr, "FEC: ");
 423                         for (j = 0; j < s->rx[x].fec_len[i]; j++)
 424                                 fprintf(stderr, "%02X ", data[j]);
 425                         fprintf(stderr, "\n");
 426 #endif
 427                 }
 428
 429                 /* See if we can reconstruct anything which is missing */
 430                 /* TODO: this does not comprehensively hunt back and repair everything that is possible */
 431                 for (l = x; l != ((x - (16 - span*entries)) & UDPTL_BUF_MASK); l = (l - 1) & UDPTL_BUF_MASK) {
 432                         if (s->rx[l].fec_len[0] <= 0)
 433                                 continue;
 434                         for (m = 0; m < s->rx[l].fec_entries; m++) {
 435                                 limit = (l + m) & UDPTL_BUF_MASK;
 436                                 for (which = -1, k = (limit - s->rx[l].fec_span * s->rx[l].fec_entries) & UDPTL_BUF_MASK; k != limit; k = (k + s->rx[l].fec_entries) & UDPTL_BUF_MASK) {
 437                                         if (s->rx[k].buf_len <= 0)
 438                                                 which = (which == -1) ? k : -2;
 439                                 }
 440                                 if (which >= 0) {
 441                                         /* Repairable */
 442                                         for (j = 0; j < s->rx[l].fec_len[m]; j++) {
 443                                                 s->rx[which].buf[j] = s->rx[l].fec[m][j];
 444                                                 for (k = (limit - s->rx[l].fec_span * s->rx[l].fec_entries) & UDPTL_BUF_MASK; k != limit; k = (k + s->rx[l].fec_entries) & UDPTL_BUF_MASK)
 445                                                         s->rx[which].buf[j] ^= (s->rx[k].buf_len > j) ? s->rx[k].buf[j] : 0;
 446                                         }
 447                                         s->rx[which].buf_len = s->rx[l].fec_len[m];
 448                                         repaired[which] = TRUE;
 449                                 }
 450                         }
 451                 }
 452                 /* Now play any new packets forwards in time */
 453                 for (l = (x + 1) & UDPTL_BUF_MASK, j = seq_no - UDPTL_BUF_MASK; l != x; l = (l + 1) & UDPTL_BUF_MASK, j++) {
 454                         if (repaired[l]) {
 455                                 //fprintf(stderr, "Fixed packet %d, len %d\n", j, l);
 456                                 s->f[ifp_no].frametype = AST_FRAME_MODEM;
 457                                 s->f[ifp_no].subclass = AST_MODEM_T38;
 458
 459                                 s->f[ifp_no].mallocd = 0;
 460                                 s->f[ifp_no].seqno = j;
 461                                 s->f[ifp_no].datalen = s->rx[l].buf_len;
 462                                 s->f[ifp_no].data.ptr = s->rx[l].buf;
 463                                 s->f[ifp_no].offset = 0;
 464                                 s->f[ifp_no].src = "UDPTL";
 465                                 if (ifp_no > 0)
 466                                         AST_LIST_NEXT(&s->f[ifp_no - 1], frame_list) = &s->f[ifp_no];
 467                                 AST_LIST_NEXT(&s->f[ifp_no], frame_list) = NULL;
 468                                 ifp_no++;
 469                         }
 470                 }
 471         }
 472
 473         /* If packets are received out of sequence, we may have already processed this packet from the error
 474            recovery information in a packet already received. */
 475         if (seq_no >= s->rx_seq_no) {
 476                 /* Decode the primary IFP packet */
 477                 s->f[ifp_no].frametype = AST_FRAME_MODEM;
 478                 s->f[ifp_no].subclass = AST_MODEM_T38;
 479
 480                 s->f[ifp_no].mallocd = 0;
 481                 s->f[ifp_no].seqno = seq_no;
 482                 s->f[ifp_no].datalen = ifp_len;
 483                 s->f[ifp_no].data.ptr = (uint8_t *) ifp;
 484                 s->f[ifp_no].offset = 0;
 485                 s->f[ifp_no].src = "UDPTL";
 486                 if (ifp_no > 0)
 487                         AST_LIST_NEXT(&s->f[ifp_no - 1], frame_list) = &s->f[ifp_no];
 488                 AST_LIST_NEXT(&s->f[ifp_no], frame_list) = NULL;
 489
 490                 ifp_no++;
 491         }
 492
 493         s->rx_seq_no = seq_no + 1;
 494         return ifp_no;
 495 }
 496 /*- End of function --------------------------------------------------------*/
 497
 498 static int udptl_build_packet(struct ast_udptl *s, uint8_t *buf, uint8_t *ifp, int ifp_len)
 499 {
 500         uint8_t fec[LOCAL_FAX_MAX_DATAGRAM];
 501         int i;
 502         int j;
 503         int seq;
 504         int entry;
 505         int entries;
 506         int span;
 507         int m;
 508         int len;
 509         int limit;
 510         int high_tide;
 511
 512         seq = s->tx_seq_no & 0xFFFF;
 513
 514         /* Map the sequence number to an entry in the circular buffer */
 515         entry = seq & UDPTL_BUF_MASK;
 516
 517         /* We save the message in a circular buffer, for generating FEC or
 518            redundancy sets later on. */
 519         s->tx[entry].buf_len = ifp_len;
 520         memcpy(s->tx[entry].buf, ifp, ifp_len);
 521
 522         /* Build the UDPTLPacket */
 523
 524         len = 0;
 525         /* Encode the sequence number */
 526         buf[len++] = (seq >> 8) & 0xFF;
 527         buf[len++] = seq & 0xFF;
 528
 529         /* Encode the primary IFP packet */
 530         if (encode_open_type(buf, &len, ifp, ifp_len) < 0)
 531                 return -1;
 532
 533         /* Encode the appropriate type of error recovery information */
 534         switch (s->error_correction_scheme)
 535         {
 536         case UDPTL_ERROR_CORRECTION_NONE:
 537                 /* Encode the error recovery type */
 538                 buf[len++] = 0x00;
 539                 /* The number of entries will always be zero, so it is pointless allowing
 540                    for the fragmented case here. */
 541                 if (encode_length(buf, &len, 0) < 0)
 542                         return -1;
 543                 break;
 544         case UDPTL_ERROR_CORRECTION_REDUNDANCY:
 545                 /* Encode the error recovery type */
 546                 buf[len++] = 0x00;
 547                 if (s->tx_seq_no > s->error_correction_entries)
 548                         entries = s->error_correction_entries;
 549                 else
 550                         entries = s->tx_seq_no;
 551                 /* The number of entries will always be small, so it is pointless allowing
 552                    for the fragmented case here. */
 553                 if (encode_length(buf, &len, entries) < 0)
 554                         return -1;
 555                 /* Encode the elements */
 556                 for (i = 0; i < entries; i++) {
 557                         j = (entry - i - 1) & UDPTL_BUF_MASK;
 558                         if (encode_open_type(buf, &len, s->tx[j].buf, s->tx[j].buf_len) < 0)
 559                                 return -1;
 560                 }
 561                 break;
 562         case UDPTL_ERROR_CORRECTION_FEC:
 563                 span = s->error_correction_span;
 564                 entries = s->error_correction_entries;
 565                 if (seq < s->error_correction_span*s->error_correction_entries) {
 566                         /* In the initial stages, wind up the FEC smoothly */
 567                         entries = seq/s->error_correction_span;
 568                         if (seq < s->error_correction_span)
 569                                 span = 0;
 570                 }
 571                 /* Encode the error recovery type */
 572                 buf[len++] = 0x80;
 573                 /* Span is defined as an inconstrained integer, which it dumb. It will only
 574                    ever be a small value. Treat it as such. */
 575                 buf[len++] = 1;
 576                 buf[len++] = span;
 577                 /* The number of entries is defined as a length, but will only ever be a small
 578                    value. Treat it as such. */
 579                 buf[len++] = entries;
 580                 for (m = 0; m < entries; m++) {
 581                         /* Make an XOR'ed entry the maximum length */
 582                         limit = (entry + m) & UDPTL_BUF_MASK;
 583                         high_tide = 0;
 584                         for (i = (limit - span*entries) & UDPTL_BUF_MASK; i != limit; i = (i + entries) & UDPTL_BUF_MASK) {
 585                                 if (high_tide < s->tx[i].buf_len) {
 586                                         for (j = 0; j < high_tide; j++)
 587                                                 fec[j] ^= s->tx[i].buf[j];
 588                                         for ( ; j < s->tx[i].buf_len; j++)
 589                                                 fec[j] = s->tx[i].buf[j];
 590                                         high_tide = s->tx[i].buf_len;
 591                                 } else {
 592                                         for (j = 0; j < s->tx[i].buf_len; j++)
 593                                                 fec[j] ^= s->tx[i].buf[j];
 594                                 }
 595                         }
 596                         if (encode_open_type(buf, &len, fec, high_tide) < 0)
 597                                 return -1;
 598                 }
 599                 break;
 600         }
 601
 602         if (s->verbose)
 603                 fprintf(stderr, "\n");
 604
 605         s->tx_seq_no++;
 606         return len;
 607 }
 608
 609 int ast_udptl_fd(struct ast_udptl *udptl)
 610 {
 611         return udptl->fd;
 612 }
 613
 614 void ast_udptl_set_data(struct ast_udptl *udptl, void *data)
 615 {
 616         udptl->data = data;
 617 }
 618
 619 void ast_udptl_set_callback(struct ast_udptl *udptl, ast_udptl_callback callback)
 620 {
 621         udptl->callback = callback;
 622 }
 623
 624 void ast_udptl_setnat(struct ast_udptl *udptl, int nat)
 625 {
 626         udptl->nat = nat;
 627 }
 628
 629 static int udptlread(int *id, int fd, short events, void *cbdata)
 630 {
 631         struct ast_udptl *udptl = cbdata;
 632         struct ast_frame *f;
 633
 634         if ((f = ast_udptl_read(udptl))) {
 635                 if (udptl->callback)
 636                         udptl->callback(udptl, f, udptl->data);
 637         }
 638         return 1;
 639 }
 640
 641 struct ast_frame *ast_udptl_read(struct ast_udptl *udptl)
 642 {
 643         int res;
 644         struct sockaddr_in sin;
 645         socklen_t len;
 646         uint16_t seqno = 0;
 647         uint16_t *udptlheader;
 648
 649         len = sizeof(sin);
 650
 651         /* Cache where the header will go */
 652         res = recvfrom(udptl->fd,
 653                         udptl->rawdata + AST_FRIENDLY_OFFSET,
 654                         sizeof(udptl->rawdata) - AST_FRIENDLY_OFFSET,
 655                         0,
 656                         (struct sockaddr *) &sin,
 657                         &len);
 658         udptlheader = (uint16_t *)(udptl->rawdata + AST_FRIENDLY_OFFSET);
 659         if (res < 0) {
 660                 if (errno != EAGAIN)
 661                         ast_log(LOG_WARNING, "UDPTL read error: %s\n", strerror(errno));
 662                 ast_assert(errno != EBADF);
 663                 return &ast_null_frame;
 664         }
 665
 666         /* Ignore if the other side hasn't been given an address yet. */
 667         if (!udptl->them.sin_addr.s_addr || !udptl->them.sin_port)
 668                 return &ast_null_frame;
 669
 670         if (udptl->nat) {
 671                 /* Send to whoever sent to us */
 672                 if ((udptl->them.sin_addr.s_addr != sin.sin_addr.s_addr) ||
 673                         (udptl->them.sin_port != sin.sin_port)) {
 674                         memcpy(&udptl->them, &sin, sizeof(udptl->them));
 675                         ast_debug(1, "UDPTL NAT: Using address %s:%d\n", ast_inet_ntoa(udptl->them.sin_addr), ntohs(udptl->them.sin_port));
 676                 }
 677         }
 678
 679         if (udptl_debug_test_addr(&sin)) {
 680                 ast_verb(1, "Got UDPTL packet from %s:%d (type %d, seq %d, len %d)\n",
 681                                 ast_inet_ntoa(sin.sin_addr), ntohs(sin.sin_port), 0, seqno, res);
 682         }
 683 #if 0
 684         printf("Got UDPTL packet from %s:%d (seq %d, len = %d)\n", ast_inet_ntoa(sin.sin_addr), ntohs(sin.sin_port), seqno, res);
 685 #endif
 686         if (udptl_rx_packet(udptl, udptl->rawdata + AST_FRIENDLY_OFFSET, res) < 1)
 687                 return &ast_null_frame;
 688
 689         return &udptl->f[0];
 690 }
 691
 692 void ast_udptl_offered_from_local(struct ast_udptl* udptl, int local)
 693 {
 694         if (udptl)
 695                 udptl->udptl_offered_from_local = local;
 696         else
 697                 ast_log(LOG_WARNING, "udptl structure is null\n");
 698 }
 699
 700 int ast_udptl_get_error_correction_scheme(struct ast_udptl* udptl)
 701 {
 702         if (udptl)
 703                 return udptl->error_correction_scheme;
 704         else {
 705                 ast_log(LOG_WARNING, "udptl structure is null\n");
 706                 return -1;
 707         }
 708 }
 709
 710 void ast_udptl_set_error_correction_scheme(struct ast_udptl* udptl, int ec)
 711 {
 712         if (udptl) {
 713                 switch (ec) {
 714                 case UDPTL_ERROR_CORRECTION_FEC:
 715                         udptl->error_correction_scheme = UDPTL_ERROR_CORRECTION_FEC;
 716                         break;
 717                 case UDPTL_ERROR_CORRECTION_REDUNDANCY:
 718                         udptl->error_correction_scheme = UDPTL_ERROR_CORRECTION_REDUNDANCY;
 719                         break;
 720                 case UDPTL_ERROR_CORRECTION_NONE:
 721                         udptl->error_correction_scheme = UDPTL_ERROR_CORRECTION_NONE;
 722                         break;
 723                 default:
 724                         ast_log(LOG_WARNING, "error correction parameter invalid\n");
 725                 };
 726         } else
 727                 ast_log(LOG_WARNING, "udptl structure is null\n");
 728 }
 729
 730 int ast_udptl_get_local_max_datagram(struct ast_udptl* udptl)
 731 {
 732         if (udptl)
 733                 return udptl->local_max_datagram_size;
 734         else {
 735                 ast_log(LOG_WARNING, "udptl structure is null\n");
 736                 return -1;
 737         }
 738 }
 739
 740 int ast_udptl_get_far_max_datagram(struct ast_udptl* udptl)
 741 {
 742         if (udptl)
 743                 return udptl->far_max_datagram_size;
 744         else {
 745                 ast_log(LOG_WARNING, "udptl structure is null\n");
 746                 return -1;
 747         }
 748 }
 749
 750 void ast_udptl_set_local_max_datagram(struct ast_udptl* udptl, int max_datagram)
 751 {
 752         if (udptl)
 753                 udptl->local_max_datagram_size = max_datagram;
 754         else
 755                 ast_log(LOG_WARNING, "udptl structure is null\n");
 756 }
 757
 758 void ast_udptl_set_far_max_datagram(struct ast_udptl* udptl, int max_datagram)
 759 {
 760         if (udptl)
 761                 udptl->far_max_datagram_size = max_datagram;
 762         else
 763                 ast_log(LOG_WARNING, "udptl structure is null\n");
 764 }
 765
 766 struct ast_udptl *ast_udptl_new_with_bindaddr(struct sched_context *sched, struct io_context *io, int callbackmode, struct in_addr addr)
 767 {
 768         struct ast_udptl *udptl;
 769         int x;
 770         int startplace;
 771         int i;
 772         long int flags;
 773
 774         if (!(udptl = ast_calloc(1, sizeof(*udptl))))
 775                 return NULL;
 776
 777         if (udptlfectype == 2)
 778                 udptl->error_correction_scheme = UDPTL_ERROR_CORRECTION_FEC;
 779         else if (udptlfectype == 1)
 780                 udptl->error_correction_scheme = UDPTL_ERROR_CORRECTION_REDUNDANCY;
 781         else
 782                 udptl->error_correction_scheme = UDPTL_ERROR_CORRECTION_NONE;
 783         udptl->error_correction_span = udptlfecspan;
 784         udptl->error_correction_entries = udptlfecentries;
 785
 786         udptl->far_max_datagram_size = udptlmaxdatagram;
 787         udptl->local_max_datagram_size = udptlmaxdatagram;
 788
 789         memset(&udptl->rx, 0, sizeof(udptl->rx));
 790         memset(&udptl->tx, 0, sizeof(udptl->tx));
 791         for (i = 0; i <= UDPTL_BUF_MASK; i++) {
 792                 udptl->rx[i].buf_len = -1;
 793                 udptl->tx[i].buf_len = -1;
 794         }
 795
 796         udptl->them.sin_family = AF_INET;
 797         udptl->us.sin_family = AF_INET;
 798
 799         if ((udptl->fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
 800                 ast_free(udptl);
 801                 ast_log(LOG_WARNING, "Unable to allocate socket: %s\n", strerror(errno));
 802                 return NULL;
 803         }
 804         flags = fcntl(udptl->fd, F_GETFL);
 805         fcntl(udptl->fd, F_SETFL, flags | O_NONBLOCK);
 806 #ifdef SO_NO_CHECK
 807         if (nochecksums)
 808                 setsockopt(udptl->fd, SOL_SOCKET, SO_NO_CHECK, &nochecksums, sizeof(nochecksums));
 809 #endif
 810         /* Find us a place */
 811         x = (ast_random() % (udptlend - udptlstart)) + udptlstart;
 812         startplace = x;
 813         for (;;) {
 814                 udptl->us.sin_port = htons(x);
 815                 udptl->us.sin_addr = addr;
 816                 if (bind(udptl->fd, (struct sockaddr *) &udptl->us, sizeof(udptl->us)) == 0)
 817                         break;
 818                 if (errno != EADDRINUSE) {
 819                         ast_log(LOG_WARNING, "Unexpected bind error: %s\n", strerror(errno));
 820                         close(udptl->fd);
 821                         ast_free(udptl);
 822                         return NULL;
 823                 }
 824                 if (++x > udptlend)
 825                         x = udptlstart;
 826                 if (x == startplace) {
 827                         ast_log(LOG_WARNING, "No UDPTL ports remaining\n");
 828                         close(udptl->fd);
 829                         ast_free(udptl);
 830                         return NULL;
 831                 }
 832         }
 833         if (io && sched && callbackmode) {
 834                 /* Operate this one in a callback mode */
 835                 udptl->sched = sched;
 836                 udptl->io = io;
 837                 udptl->ioid = ast_io_add(udptl->io, udptl->fd, udptlread, AST_IO_IN, udptl);
 838         }
 839         return udptl;
 840 }
 841
 842 struct ast_udptl *ast_udptl_new(struct sched_context *sched, struct io_context *io, int callbackmode)
 843 {
 844         struct in_addr ia;
 845         memset(&ia, 0, sizeof(ia));
 846         return ast_udptl_new_with_bindaddr(sched, io, callbackmode, ia);
 847 }
 848
 849 int ast_udptl_setqos(struct ast_udptl *udptl, int tos, int cos)
 850 {
 851         return ast_netsock_set_qos(udptl->fd, tos, cos, "UDPTL");
 852 }
 853
 854 void ast_udptl_set_peer(struct ast_udptl *udptl, struct sockaddr_in *them)
 855 {
 856         udptl->them.sin_port = them->sin_port;
 857         udptl->them.sin_addr = them->sin_addr;
 858 }
 859
 860 void ast_udptl_get_peer(struct ast_udptl *udptl, struct sockaddr_in *them)
 861 {
 862         memset(them, 0, sizeof(*them));
 863         them->sin_family = AF_INET;
 864         them->sin_port = udptl->them.sin_port;
 865         them->sin_addr = udptl->them.sin_addr;
 866 }
 867
 868 void ast_udptl_get_us(struct ast_udptl *udptl, struct sockaddr_in *us)
 869 {
 870         memcpy(us, &udptl->us, sizeof(udptl->us));
 871 }
 872
 873 void ast_udptl_stop(struct ast_udptl *udptl)
 874 {
 875         memset(&udptl->them.sin_addr, 0, sizeof(udptl->them.sin_addr));
 876         memset(&udptl->them.sin_port, 0, sizeof(udptl->them.sin_port));
 877 }
 878
 879 void ast_udptl_destroy(struct ast_udptl *udptl)
 880 {
 881         if (udptl->ioid)
 882                 ast_io_remove(udptl->io, udptl->ioid);
 883         if (udptl->fd > -1)
 884                 close(udptl->fd);
 885         ast_free(udptl);
 886 }
 887
 888 int ast_udptl_write(struct ast_udptl *s, struct ast_frame *f)
 889 {
 890         int seq;
 891         int len;
 892         int res;
 893         uint8_t buf[LOCAL_FAX_MAX_DATAGRAM];
 894
 895         /* If we have no peer, return immediately */
 896         if (s->them.sin_addr.s_addr == INADDR_ANY)
 897                 return 0;
 898
 899         /* If there is no data length, return immediately */
 900         if (f->datalen == 0)
 901                 return 0;
 902
 903         if (f->frametype != AST_FRAME_MODEM) {
 904                 ast_log(LOG_WARNING, "UDPTL can only send T.38 data\n");
 905                 return -1;
 906         }
 907
 908         /* Save seq_no for debug output because udptl_build_packet increments it */
 909         seq = s->tx_seq_no & 0xFFFF;
 910
 911         /* Cook up the UDPTL packet, with the relevant EC info. */
 912         len = udptl_build_packet(s, buf, f->data.ptr, f->datalen);
 913
 914         if (len > 0 && s->them.sin_port && s->them.sin_addr.s_addr) {
 915                 if ((res = sendto(s->fd, buf, len, 0, (struct sockaddr *) &s->them, sizeof(s->them))) < 0)
 916                         ast_log(LOG_NOTICE, "UDPTL Transmission error to %s:%d: %s\n", ast_inet_ntoa(s->them.sin_addr), ntohs(s->them.sin_port), strerror(errno));
 917 #if 0
 918                 printf("Sent %d bytes of UDPTL data to %s:%d\n", res, ast_inet_ntoa(udptl->them.sin_addr), ntohs(udptl->them.sin_port));
 919 #endif
 920                 if (udptl_debug_test_addr(&s->them))
 921                         ast_verb(1, "Sent UDPTL packet to %s:%d (type %d, seq %d, len %d)\n",
 922                                         ast_inet_ntoa(s->them.sin_addr),
 923                                         ntohs(s->them.sin_port), 0, seq, len);
 924         }
 925
 926         return 0;
 927 }
 928
 929 void ast_udptl_proto_unregister(struct ast_udptl_protocol *proto)
 930 {
 931         AST_RWLIST_WRLOCK(&protos);
 932         AST_RWLIST_REMOVE(&protos, proto, list);
 933         AST_RWLIST_UNLOCK(&protos);
 934 }
 935
 936 int ast_udptl_proto_register(struct ast_udptl_protocol *proto)
 937 {
 938         struct ast_udptl_protocol *cur;
 939
 940         AST_RWLIST_WRLOCK(&protos);
 941         AST_RWLIST_TRAVERSE(&protos, cur, list) {
 942                 if (cur->type == proto->type) {
 943                         ast_log(LOG_WARNING, "Tried to register same protocol '%s' twice\n", cur->type);
 944                         AST_RWLIST_UNLOCK(&protos);
 945                         return -1;
 946                 }
 947         }
 948         AST_RWLIST_INSERT_TAIL(&protos, proto, list);
 949         AST_RWLIST_UNLOCK(&protos);
 950         return 0;
 951 }
 952
 953 static struct ast_udptl_protocol *get_proto(struct ast_channel *chan)
 954 {
 955         struct ast_udptl_protocol *cur = NULL;
 956
 957         AST_RWLIST_RDLOCK(&protos);
 958         AST_RWLIST_TRAVERSE(&protos, cur, list) {
 959                 if (cur->type == chan->tech->type)
 960                         break;
 961         }
 962         AST_RWLIST_UNLOCK(&protos);
 963
 964         return cur;
 965 }
 966
 967 int ast_udptl_bridge(struct ast_channel *c0, struct ast_channel *c1, int flags, struct ast_frame **fo, struct ast_channel **rc)
 968 {
 969         struct ast_frame *f;
 970         struct ast_channel *who;
 971         struct ast_channel *cs[3];
 972         struct ast_udptl *p0;
 973         struct ast_udptl *p1;
 974         struct ast_udptl_protocol *pr0;
 975         struct ast_udptl_protocol *pr1;
 976         struct sockaddr_in ac0;
 977         struct sockaddr_in ac1;
 978         struct sockaddr_in t0;
 979         struct sockaddr_in t1;
 980         void *pvt0;
 981         void *pvt1;
 982         int to;
 983
 984         ast_channel_lock(c0);
 985         while (ast_channel_trylock(c1)) {
 986                 ast_channel_unlock(c0);
 987                 usleep(1);
 988                 ast_channel_lock(c0);
 989         }
 990         pr0 = get_proto(c0);
 991         pr1 = get_proto(c1);
 992         if (!pr0) {
 993                 ast_log(LOG_WARNING, "Can't find native functions for channel '%s'\n", c0->name);
 994                 ast_channel_unlock(c0);
 995                 ast_channel_unlock(c1);
 996                 return -1;
 997         }
 998         if (!pr1) {
 999                 ast_log(LOG_WARNING, "Can't find native functions for channel '%s'\n", c1->name);
1000                 ast_channel_unlock(c0);
1001                 ast_channel_unlock(c1);
1002                 return -1;
1003         }
1004         pvt0 = c0->tech_pvt;
1005         pvt1 = c1->tech_pvt;
1006         p0 = pr0->get_udptl_info(c0);
1007         p1 = pr1->get_udptl_info(c1);
1008         if (!p0 || !p1) {
1009                 /* Somebody doesn't want to play... */
1010                 ast_channel_unlock(c0);
1011                 ast_channel_unlock(c1);
1012                 return -2;
1013         }
1014         if (pr0->set_udptl_peer(c0, p1)) {
1015                 ast_log(LOG_WARNING, "Channel '%s' failed to talk to '%s'\n", c0->name, c1->name);
1016                 memset(&ac1, 0, sizeof(ac1));
1017         } else {
1018                 /* Store UDPTL peer */
1019                 ast_udptl_get_peer(p1, &ac1);
1020         }
1021         if (pr1->set_udptl_peer(c1, p0)) {
1022                 ast_log(LOG_WARNING, "Channel '%s' failed to talk back to '%s'\n", c1->name, c0->name);
1023                 memset(&ac0, 0, sizeof(ac0));
1024         } else {
1025                 /* Store UDPTL peer */
1026                 ast_udptl_get_peer(p0, &ac0);
1027         }
1028         ast_channel_unlock(c0);
1029         ast_channel_unlock(c1);
1030         cs[0] = c0;
1031         cs[1] = c1;
1032         cs[2] = NULL;
1033         for (;;) {
1034                 if ((c0->tech_pvt != pvt0) ||
1035                         (c1->tech_pvt != pvt1) ||
1036                         (c0->masq || c0->masqr || c1->masq || c1->masqr)) {
1037                                 ast_debug(1, "Oooh, something is weird, backing out\n");
1038                                 /* Tell it to try again later */
1039                                 return -3;
1040                 }
1041                 to = -1;
1042                 ast_udptl_get_peer(p1, &t1);
1043                 ast_udptl_get_peer(p0, &t0);
1044                 if (inaddrcmp(&t1, &ac1)) {
1045                         ast_debug(1, "Oooh, '%s' changed end address to %s:%d\n",
1046                                 c1->name, ast_inet_ntoa(t1.sin_addr), ntohs(t1.sin_port));
1047                         ast_debug(1, "Oooh, '%s' was %s:%d\n",
1048                                 c1->name, ast_inet_ntoa(ac1.sin_addr), ntohs(ac1.sin_port));
1049                         memcpy(&ac1, &t1, sizeof(ac1));
1050                 }
1051                 if (inaddrcmp(&t0, &ac0)) {
1052                         ast_debug(1, "Oooh, '%s' changed end address to %s:%d\n",
1053                                 c0->name, ast_inet_ntoa(t0.sin_addr), ntohs(t0.sin_port));
1054                         ast_debug(1, "Oooh, '%s' was %s:%d\n",
1055                                 c0->name, ast_inet_ntoa(ac0.sin_addr), ntohs(ac0.sin_port));
1056                         memcpy(&ac0, &t0, sizeof(ac0));
1057                 }
1058                 who = ast_waitfor_n(cs, 2, &to);
1059                 if (!who) {
1060                         ast_debug(1, "Ooh, empty read...\n");
1061                         /* check for hangup / whentohangup */
1062                         if (ast_check_hangup(c0) || ast_check_hangup(c1))
1063                                 break;
1064                         continue;
1065                 }
1066                 f = ast_read(who);
1067                 if (!f) {
1068                         *fo = f;
1069                         *rc = who;
1070                         ast_debug(1, "Oooh, got a %s\n", f ? "digit" : "hangup");
1071                         /* That's all we needed */
1072                         return 0;
1073                 } else {
1074                         if (f->frametype == AST_FRAME_MODEM) {
1075                                 /* Forward T.38 frames if they happen upon us */
1076                                 if (who == c0) {
1077                                         ast_write(c1, f);
1078                                 } else if (who == c1) {
1079                                         ast_write(c0, f);
1080                                 }
1081                         }
1082                         ast_frfree(f);
1083                 }
1084                 /* Swap priority. Not that it's a big deal at this point */
1085                 cs[2] = cs[0];
1086                 cs[0] = cs[1];
1087                 cs[1] = cs[2];
1088         }
1089         return -1;
1090 }
1091
1092 static char *handle_cli_udptl_debug_deprecated(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
1093 {
1094         struct hostent *hp;
1095         struct ast_hostent ahp;
1096         int port;
1097         char *p;
1098         char *arg;
1099
1100         switch (cmd) {
1101         case CLI_INIT:
1102                 e->command = "udptl debug [off|ip]";
1103                 e->usage =
1104                         "Usage: udptl debug [off]|[ip host[:port]]\n"
1105                         "       Enable or disable dumping of UDPTL packets.\n"
1106                         "       If ip is specified, limit the dumped packets to those to and from\n"
1107                         "       the specified 'host' with optional port.\n";
1108                 return NULL;
1109         case CLI_GENERATE:
1110                 return NULL;
1111         }
1112
1113         if (a->argc < 2 || a->argc > 4)
1114                 return CLI_SHOWUSAGE;
1115
1116         if (a->argc == 2) {
1117                 udptldebug = 1;
1118                 memset(&udptldebugaddr, 0, sizeof(udptldebugaddr));
1119                 ast_cli(a->fd, "UDPTL Debugging Enabled\n");
1120         } else if (a->argc == 3) {
1121                 if (strncasecmp(a->argv[2], "off", 3))
1122                         return CLI_SHOWUSAGE;
1123                 udptldebug = 0;
1124                 ast_cli(a->fd, "UDPTL Debugging Disabled\n");
1125         } else {
1126                 if (strncasecmp(a->argv[2], "ip", 2))
1127                         return CLI_SHOWUSAGE;
1128                 port = 0;
1129                 arg = a->argv[3];
1130                 p = strstr(arg, ":");
1131                 if (p) {
1132                         *p = '\0';
1133                         p++;
1134                         port = atoi(p);
1135                 }
1136                 hp = ast_gethostbyname(arg, &ahp);
1137                 if (hp == NULL)
1138                         return CLI_SHOWUSAGE;
1139                 udptldebugaddr.sin_family = AF_INET;
1140                 memcpy(&udptldebugaddr.sin_addr, hp->h_addr, sizeof(udptldebugaddr.sin_addr));
1141                 udptldebugaddr.sin_port = htons(port);
1142                 if (port == 0)
1143                         ast_cli(a->fd, "UDPTL Debugging Enabled for IP: %s\n", ast_inet_ntoa(udptldebugaddr.sin_addr));
1144                 else
1145                         ast_cli(a->fd, "UDPTL Debugging Enabled for IP: %s:%d\n", ast_inet_ntoa(udptldebugaddr.sin_addr), port);
1146                 udptldebug = 1;
1147         }
1148
1149         return CLI_SUCCESS;
1150 }
1151
1152 static char *handle_cli_udptl_set_debug(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
1153 {
1154         struct hostent *hp;
1155         struct ast_hostent ahp;
1156         int port;
1157         char *p;
1158         char *arg;
1159
1160         switch (cmd) {
1161         case CLI_INIT:
1162                 e->command = "udptl set debug {on|off|ip}";
1163                 e->usage =
1164                         "Usage: udptl set debug {on|off|ip host[:port]}\n"
1165                         "       Enable or disable dumping of UDPTL packets.\n"
1166                         "       If ip is specified, limit the dumped packets to those to and from\n"
1167                         "       the specified 'host' with optional port.\n";
1168                 return NULL;
1169         case CLI_GENERATE:
1170                 return NULL;
1171         }
1172
1173         if (a->argc < 4 || a->argc > 5)
1174                 return CLI_SHOWUSAGE;
1175
1176         if (a->argc == 4) {
1177                 if (!strncasecmp(a->argv[3], "on", 2)) {
1178                         udptldebug = 1;
1179                         memset(&udptldebugaddr, 0, sizeof(udptldebugaddr));
1180                         ast_cli(a->fd, "UDPTL Debugging Enabled\n");
1181                 } else if (!strncasecmp(a->argv[3], "off", 3)) {
1182                         udptldebug = 0;
1183                         ast_cli(a->fd, "UDPTL Debugging Disabled\n");
1184                 } else {
1185                         return CLI_SHOWUSAGE;
1186                 }
1187         } else {
1188                 if (strncasecmp(a->argv[3], "ip", 2))
1189                         return CLI_SHOWUSAGE;
1190                 port = 0;
1191                 arg = a->argv[4];
1192                 p = strstr(arg, ":");
1193                 if (p) {
1194                         *p = '\0';
1195                         p++;
1196                         port = atoi(p);
1197                 }
1198                 hp = ast_gethostbyname(arg, &ahp);
1199                 if (hp == NULL)
1200                         return CLI_SHOWUSAGE;
1201                 udptldebugaddr.sin_family = AF_INET;
1202                 memcpy(&udptldebugaddr.sin_addr, hp->h_addr, sizeof(udptldebugaddr.sin_addr));
1203                 udptldebugaddr.sin_port = htons(port);
1204                 if (port == 0)
1205                         ast_cli(a->fd, "UDPTL Debugging Enabled for IP: %s\n", ast_inet_ntoa(udptldebugaddr.sin_addr));
1206                 else
1207                         ast_cli(a->fd, "UDPTL Debugging Enabled for IP: %s:%d\n", ast_inet_ntoa(udptldebugaddr.sin_addr), port);
1208                 udptldebug = 1;
1209         }
1210
1211         return CLI_SUCCESS;
1212 }
1213
1214 static struct ast_cli_entry cli_handle_udptl_debug_deprecated = AST_CLI_DEFINE(handle_cli_udptl_debug_deprecated, "Enable/Disable UDPTL debugging");
1215
1216 static struct ast_cli_entry cli_udptl[] = {
1217         AST_CLI_DEFINE(handle_cli_udptl_set_debug, "Enable/Disable UDPTL debugging", .deprecate_cmd = &cli_handle_udptl_debug_deprecated)
1218 };
1219
1220 static void __ast_udptl_reload(int reload)
1221 {
1222         struct ast_config *cfg;
1223         const char *s;
1224         struct ast_flags config_flags = { reload ? CONFIG_FLAG_FILEUNCHANGED : 0 };
1225
1226         if ((cfg = ast_config_load2("udptl.conf", "udptl", config_flags)) == CONFIG_STATUS_FILEUNCHANGED)
1227                 return;
1228
1229         udptlstart = 4500;
1230         udptlend = 4999;
1231         udptlfectype = 0;
1232         udptlfecentries = 0;
1233         udptlfecspan = 0;
1234         udptlmaxdatagram = 0;
1235
1236         if (cfg) {
1237                 if ((s = ast_variable_retrieve(cfg, "general", "udptlstart"))) {
1238                         udptlstart = atoi(s);
1239                         if (udptlstart < 1024)
1240                                 udptlstart = 1024;
1241                         if (udptlstart > 65535)
1242                                 udptlstart = 65535;
1243                 }
1244                 if ((s = ast_variable_retrieve(cfg, "general", "udptlend"))) {
1245                         udptlend = atoi(s);
1246                         if (udptlend < 1024)
1247                                 udptlend = 1024;
1248                         if (udptlend > 65535)
1249                                 udptlend = 65535;
1250                 }
1251                 if ((s = ast_variable_retrieve(cfg, "general", "udptlchecksums"))) {
1252 #ifdef SO_NO_CHECK
1253                         if (ast_false(s))
1254                                 nochecksums = 1;
1255                         else
1256                                 nochecksums = 0;
1257 #else
1258                         if (ast_false(s))
1259                                 ast_log(LOG_WARNING, "Disabling UDPTL checksums is not supported on this operating system!\n");
1260 #endif
1261                 }
1262                 if ((s = ast_variable_retrieve(cfg, "general", "T38FaxUdpEC"))) {
1263                         if (strcmp(s, "t38UDPFEC") == 0)
1264                                 udptlfectype = 2;
1265                         else if (strcmp(s, "t38UDPRedundancy") == 0)
1266                                 udptlfectype = 1;
1267                 }
1268                 if ((s = ast_variable_retrieve(cfg, "general", "T38FaxMaxDatagram"))) {
1269                         udptlmaxdatagram = atoi(s);
1270                         if (udptlmaxdatagram < 0)
1271                                 udptlmaxdatagram = 0;
1272                         if (udptlmaxdatagram > LOCAL_FAX_MAX_DATAGRAM)
1273                                 udptlmaxdatagram = LOCAL_FAX_MAX_DATAGRAM;
1274                 }
1275                 if ((s = ast_variable_retrieve(cfg, "general", "UDPTLFECentries"))) {
1276                         udptlfecentries = atoi(s);
1277                         if (udptlfecentries < 0)
1278                                 udptlfecentries = 0;
1279                         if (udptlfecentries > MAX_FEC_ENTRIES)
1280                                 udptlfecentries = MAX_FEC_ENTRIES;
1281                 }
1282                 if ((s = ast_variable_retrieve(cfg, "general", "UDPTLFECspan"))) {
1283                         udptlfecspan = atoi(s);
1284                         if (udptlfecspan < 0)
1285                                 udptlfecspan = 0;
1286                         if (udptlfecspan > MAX_FEC_SPAN)
1287                                 udptlfecspan = MAX_FEC_SPAN;
1288                 }
1289                 ast_config_destroy(cfg);
1290         }
1291         if (udptlstart >= udptlend) {
1292                 ast_log(LOG_WARNING, "Unreasonable values for UDPTL start/end\n");
1293                 udptlstart = 4500;
1294                 udptlend = 4999;
1295         }
1296         ast_verb(2, "UDPTL allocating from port range %d -> %d\n", udptlstart, udptlend);
1297 }
1298
1299 int ast_udptl_reload(void)
1300 {
1301         __ast_udptl_reload(1);
1302         return 0;
1303 }
1304
1305 void ast_udptl_init(void)
1306 {
1307         ast_cli_register_multiple(cli_udptl, sizeof(cli_udptl) / sizeof(struct ast_cli_entry));
1308         __ast_udptl_reload(0);
1309 }