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00018 #include "asterisk.h"
00019
00020 ASTERISK_FILE_VERSION(__FILE__, "$Revision: 175311 $")
00021
00022 #include <stdio.h>
00023 #include <stdlib.h>
00024 #include <string.h>
00025 #include <sys/time.h>
00026 #include <signal.h>
00027 #include <errno.h>
00028 #include <unistd.h>
00029 #include <netinet/in.h>
00030 #include <sys/time.h>
00031 #include <sys/socket.h>
00032 #include <arpa/inet.h>
00033 #include <fcntl.h>
00034
00035 #include "asterisk/udptl.h"
00036 #include "asterisk/frame.h"
00037 #include "asterisk/logger.h"
00038 #include "asterisk/options.h"
00039 #include "asterisk/channel.h"
00040 #include "asterisk/acl.h"
00041 #include "asterisk/channel.h"
00042 #include "asterisk/config.h"
00043 #include "asterisk/lock.h"
00044 #include "asterisk/utils.h"
00045 #include "asterisk/cli.h"
00046 #include "asterisk/unaligned.h"
00047 #include "asterisk/utils.h"
00048
00049 #define UDPTL_MTU 1200
00050
00051 #if !defined(FALSE)
00052 #define FALSE 0
00053 #endif
00054 #if !defined(TRUE)
00055 #define TRUE (!FALSE)
00056 #endif
00057
00058 static int udptlstart;
00059 static int udptlend;
00060 static int udptldebug;
00061 static struct sockaddr_in udptldebugaddr;
00062 #ifdef SO_NO_CHECK
00063 static int nochecksums;
00064 #endif
00065 static int udptlfectype;
00066 static int udptlfecentries;
00067 static int udptlfecspan;
00068 static int udptlmaxdatagram;
00069
00070 #define LOCAL_FAX_MAX_DATAGRAM 1400
00071 #define MAX_FEC_ENTRIES 5
00072 #define MAX_FEC_SPAN 5
00073
00074 #define UDPTL_BUF_MASK 15
00075
00076 typedef struct {
00077 int buf_len;
00078 uint8_t buf[LOCAL_FAX_MAX_DATAGRAM];
00079 } udptl_fec_tx_buffer_t;
00080
00081 typedef struct {
00082 int buf_len;
00083 uint8_t buf[LOCAL_FAX_MAX_DATAGRAM];
00084 int fec_len[MAX_FEC_ENTRIES];
00085 uint8_t fec[MAX_FEC_ENTRIES][LOCAL_FAX_MAX_DATAGRAM];
00086 int fec_span;
00087 int fec_entries;
00088 } udptl_fec_rx_buffer_t;
00089
00090 struct ast_udptl {
00091 int fd;
00092 char resp;
00093 struct ast_frame f[16];
00094 unsigned char rawdata[8192 + AST_FRIENDLY_OFFSET];
00095 unsigned int lasteventseqn;
00096 int nat;
00097 int flags;
00098 struct sockaddr_in us;
00099 struct sockaddr_in them;
00100 int *ioid;
00101 struct sched_context *sched;
00102 struct io_context *io;
00103 void *data;
00104 ast_udptl_callback callback;
00105 int udptl_offered_from_local;
00106
00107
00108
00109 int error_correction_scheme;
00110
00111
00112
00113 int error_correction_entries;
00114
00115
00116
00117 int error_correction_span;
00118
00119
00120
00121 int far_max_datagram_size;
00122
00123
00124
00125 int local_max_datagram_size;
00126
00127 int verbose;
00128
00129 struct sockaddr_in far;
00130
00131 int tx_seq_no;
00132 int rx_seq_no;
00133 int rx_expected_seq_no;
00134
00135 udptl_fec_tx_buffer_t tx[UDPTL_BUF_MASK + 1];
00136 udptl_fec_rx_buffer_t rx[UDPTL_BUF_MASK + 1];
00137 };
00138
00139 static struct ast_udptl_protocol *protos;
00140
00141 static int udptl_rx_packet(struct ast_udptl *s, uint8_t *buf, int len);
00142 static int udptl_build_packet(struct ast_udptl *s, uint8_t *buf, int buflen, uint8_t *ifp, int ifp_len);
00143
00144 static inline int udptl_debug_test_addr(struct sockaddr_in *addr)
00145 {
00146 if (udptldebug == 0)
00147 return 0;
00148 if (udptldebugaddr.sin_addr.s_addr) {
00149 if (((ntohs(udptldebugaddr.sin_port) != 0)
00150 && (udptldebugaddr.sin_port != addr->sin_port))
00151 || (udptldebugaddr.sin_addr.s_addr != addr->sin_addr.s_addr))
00152 return 0;
00153 }
00154 return 1;
00155 }
00156
00157 static int decode_length(uint8_t *buf, int limit, int *len, int *pvalue)
00158 {
00159 if (*len >= limit)
00160 return -1;
00161 if ((buf[*len] & 0x80) == 0) {
00162 *pvalue = buf[*len];
00163 (*len)++;
00164 return 0;
00165 }
00166 if ((buf[*len] & 0x40) == 0) {
00167 if (*len == limit - 1)
00168 return -1;
00169 *pvalue = (buf[*len] & 0x3F) << 8;
00170 (*len)++;
00171 *pvalue |= buf[*len];
00172 (*len)++;
00173 return 0;
00174 }
00175 *pvalue = (buf[*len] & 0x3F) << 14;
00176 (*len)++;
00177
00178 return 1;
00179 }
00180
00181
00182 static int decode_open_type(uint8_t *buf, int limit, int *len, const uint8_t **p_object, int *p_num_octets)
00183 {
00184 int octet_cnt;
00185 int octet_idx;
00186 int stat;
00187 int i;
00188 const uint8_t **pbuf;
00189
00190 for (octet_idx = 0, *p_num_octets = 0; ; octet_idx += octet_cnt) {
00191 if ((stat = decode_length(buf, limit, len, &octet_cnt)) < 0)
00192 return -1;
00193 if (octet_cnt > 0) {
00194 *p_num_octets += octet_cnt;
00195
00196 pbuf = &p_object[octet_idx];
00197 i = 0;
00198
00199 if ((*len + octet_cnt) > limit)
00200 return -1;
00201
00202 *pbuf = &buf[*len];
00203 *len += octet_cnt;
00204 }
00205 if (stat == 0)
00206 break;
00207 }
00208 return 0;
00209 }
00210
00211
00212 static int encode_length(uint8_t *buf, int *len, int value)
00213 {
00214 int multiplier;
00215
00216 if (value < 0x80) {
00217
00218 buf[*len] = value;
00219 (*len)++;
00220 return value;
00221 }
00222 if (value < 0x4000) {
00223
00224
00225 buf[*len] = ((0x8000 | value) >> 8) & 0xFF;
00226 (*len)++;
00227 buf[*len] = value & 0xFF;
00228 (*len)++;
00229 return value;
00230 }
00231
00232 multiplier = (value < 0x10000) ? (value >> 14) : 4;
00233
00234 buf[*len] = 0xC0 | multiplier;
00235 (*len)++;
00236 return multiplier << 14;
00237 }
00238
00239
00240 static int encode_open_type(uint8_t *buf, int buflen, int *len, const uint8_t *data, int num_octets)
00241 {
00242 int enclen;
00243 int octet_idx;
00244 uint8_t zero_byte;
00245
00246
00247 if (num_octets == 0) {
00248 zero_byte = 0;
00249 data = &zero_byte;
00250 num_octets = 1;
00251 }
00252
00253 for (octet_idx = 0; ; num_octets -= enclen, octet_idx += enclen) {
00254 if ((enclen = encode_length(buf, len, num_octets)) < 0)
00255 return -1;
00256 if (enclen + *len > buflen) {
00257 ast_log(LOG_ERROR, "Buffer overflow detected (%d + %d > %d)\n", enclen, *len, buflen);
00258 return -1;
00259 }
00260 if (enclen > 0) {
00261 memcpy(&buf[*len], &data[octet_idx], enclen);
00262 *len += enclen;
00263 }
00264 if (enclen >= num_octets)
00265 break;
00266 }
00267
00268 return 0;
00269 }
00270
00271
00272 static int udptl_rx_packet(struct ast_udptl *s, uint8_t *buf, int len)
00273 {
00274 int stat;
00275 int stat2;
00276 int i;
00277 int j;
00278 int k;
00279 int l;
00280 int m;
00281 int x;
00282 int limit;
00283 int which;
00284 int ptr;
00285 int count;
00286 int total_count;
00287 int seq_no;
00288 const uint8_t *ifp;
00289 const uint8_t *data;
00290 int ifp_len;
00291 int repaired[16];
00292 const uint8_t *bufs[16];
00293 int lengths[16];
00294 int span;
00295 int entries;
00296 int ifp_no;
00297
00298 ptr = 0;
00299 ifp_no = 0;
00300 memset(&s->f[0], 0, sizeof(s->f[0]));
00301
00302
00303 if (ptr + 2 > len)
00304 return -1;
00305 seq_no = (buf[0] << 8) | buf[1];
00306 ptr += 2;
00307
00308
00309 if ((stat = decode_open_type(buf, len, &ptr, &ifp, &ifp_len)) != 0)
00310 return -1;
00311
00312 if (ptr + 1 > len)
00313 return -1;
00314 if ((buf[ptr++] & 0x80) == 0) {
00315
00316 if (seq_no > s->rx_seq_no) {
00317
00318
00319 total_count = 0;
00320 do {
00321 if ((stat2 = decode_length(buf, len, &ptr, &count)) < 0)
00322 return -1;
00323 for (i = 0; i < count; i++) {
00324 if ((stat = decode_open_type(buf, len, &ptr, &bufs[total_count + i], &lengths[total_count + i])) != 0)
00325 return -1;
00326 }
00327 total_count += count;
00328 }
00329 while (stat2 > 0);
00330
00331 for (i = total_count; i > 0; i--) {
00332 if (seq_no - i >= s->rx_seq_no) {
00333
00334
00335
00336 s->f[ifp_no].frametype = AST_FRAME_MODEM;
00337 s->f[ifp_no].subclass = AST_MODEM_T38;
00338
00339 s->f[ifp_no].mallocd = 0;
00340 s->f[ifp_no].seqno = seq_no - i;
00341 s->f[ifp_no].datalen = lengths[i - 1];
00342 s->f[ifp_no].data = (uint8_t *) bufs[i - 1];
00343 s->f[ifp_no].offset = 0;
00344 s->f[ifp_no].src = "UDPTL";
00345 if (ifp_no > 0)
00346 AST_LIST_NEXT(&s->f[ifp_no - 1], frame_list) = &s->f[ifp_no];
00347 AST_LIST_NEXT(&s->f[ifp_no], frame_list) = NULL;
00348 ifp_no++;
00349 }
00350 }
00351 }
00352 }
00353 else
00354 {
00355
00356
00357 if (ifp_len > LOCAL_FAX_MAX_DATAGRAM)
00358 return -1;
00359
00360 for ( ; seq_no > s->rx_seq_no; s->rx_seq_no++) {
00361 x = s->rx_seq_no & UDPTL_BUF_MASK;
00362 s->rx[x].buf_len = -1;
00363 s->rx[x].fec_len[0] = 0;
00364 s->rx[x].fec_span = 0;
00365 s->rx[x].fec_entries = 0;
00366 }
00367
00368 x = seq_no & UDPTL_BUF_MASK;
00369
00370 memset(repaired, 0, sizeof(repaired));
00371
00372
00373 memcpy(s->rx[x].buf, ifp, ifp_len);
00374 s->rx[x].buf_len = ifp_len;
00375 repaired[x] = TRUE;
00376
00377
00378
00379
00380 if (ptr + 2 > len)
00381 return -1;
00382 if (buf[ptr++] != 1)
00383 return -1;
00384 span = buf[ptr++];
00385 s->rx[x].fec_span = span;
00386
00387
00388
00389 if (ptr + 1 > len)
00390 return -1;
00391 entries = buf[ptr++];
00392 s->rx[x].fec_entries = entries;
00393
00394
00395 for (i = 0; i < entries; i++) {
00396 if ((stat = decode_open_type(buf, len, &ptr, &data, &s->rx[x].fec_len[i])) != 0)
00397 return -1;
00398 if (s->rx[x].fec_len[i] > LOCAL_FAX_MAX_DATAGRAM)
00399 return -1;
00400
00401
00402 memcpy(s->rx[x].fec[i], data, s->rx[x].fec_len[i]);
00403 #if 0
00404 fprintf(stderr, "FEC: ");
00405 for (j = 0; j < s->rx[x].fec_len[i]; j++)
00406 fprintf(stderr, "%02X ", data[j]);
00407 fprintf(stderr, "\n");
00408 #endif
00409 }
00410
00411
00412
00413 for (l = x; l != ((x - (16 - span*entries)) & UDPTL_BUF_MASK); l = (l - 1) & UDPTL_BUF_MASK) {
00414 if (s->rx[l].fec_len[0] <= 0)
00415 continue;
00416 for (m = 0; m < s->rx[l].fec_entries; m++) {
00417 limit = (l + m) & UDPTL_BUF_MASK;
00418 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) {
00419 if (s->rx[k].buf_len <= 0)
00420 which = (which == -1) ? k : -2;
00421 }
00422 if (which >= 0) {
00423
00424 for (j = 0; j < s->rx[l].fec_len[m]; j++) {
00425 s->rx[which].buf[j] = s->rx[l].fec[m][j];
00426 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)
00427 s->rx[which].buf[j] ^= (s->rx[k].buf_len > j) ? s->rx[k].buf[j] : 0;
00428 }
00429 s->rx[which].buf_len = s->rx[l].fec_len[m];
00430 repaired[which] = TRUE;
00431 }
00432 }
00433 }
00434
00435 for (l = (x + 1) & UDPTL_BUF_MASK, j = seq_no - UDPTL_BUF_MASK; l != x; l = (l + 1) & UDPTL_BUF_MASK, j++) {
00436 if (repaired[l]) {
00437
00438 s->f[ifp_no].frametype = AST_FRAME_MODEM;
00439 s->f[ifp_no].subclass = AST_MODEM_T38;
00440
00441 s->f[ifp_no].mallocd = 0;
00442 s->f[ifp_no].seqno = j;
00443 s->f[ifp_no].datalen = s->rx[l].buf_len;
00444 s->f[ifp_no].data = s->rx[l].buf;
00445 s->f[ifp_no].offset = 0;
00446 s->f[ifp_no].src = "UDPTL";
00447 if (ifp_no > 0)
00448 AST_LIST_NEXT(&s->f[ifp_no - 1], frame_list) = &s->f[ifp_no];
00449 AST_LIST_NEXT(&s->f[ifp_no], frame_list) = NULL;
00450 ifp_no++;
00451 }
00452 }
00453 }
00454
00455
00456
00457 if (seq_no >= s->rx_seq_no) {
00458
00459 s->f[ifp_no].frametype = AST_FRAME_MODEM;
00460 s->f[ifp_no].subclass = AST_MODEM_T38;
00461
00462 s->f[ifp_no].mallocd = 0;
00463 s->f[ifp_no].seqno = seq_no;
00464 s->f[ifp_no].datalen = ifp_len;
00465 s->f[ifp_no].data = (uint8_t *) ifp;
00466 s->f[ifp_no].offset = 0;
00467 s->f[ifp_no].src = "UDPTL";
00468 if (ifp_no > 0)
00469 AST_LIST_NEXT(&s->f[ifp_no - 1], frame_list) = &s->f[ifp_no];
00470 AST_LIST_NEXT(&s->f[ifp_no], frame_list) = NULL;
00471
00472 ifp_no++;
00473 }
00474
00475 s->rx_seq_no = seq_no + 1;
00476 return ifp_no;
00477 }
00478
00479
00480 static int udptl_build_packet(struct ast_udptl *s, uint8_t *buf, int buflen, uint8_t *ifp, int ifp_len)
00481 {
00482 uint8_t fec[LOCAL_FAX_MAX_DATAGRAM * 2];
00483 int i;
00484 int j;
00485 int seq;
00486 int entry;
00487 int entries;
00488 int span;
00489 int m;
00490 int len;
00491 int limit;
00492 int high_tide;
00493
00494 seq = s->tx_seq_no & 0xFFFF;
00495
00496
00497 entry = seq & UDPTL_BUF_MASK;
00498
00499
00500
00501 s->tx[entry].buf_len = ifp_len;
00502 memcpy(s->tx[entry].buf, ifp, ifp_len);
00503
00504
00505
00506 len = 0;
00507
00508 buf[len++] = (seq >> 8) & 0xFF;
00509 buf[len++] = seq & 0xFF;
00510
00511
00512 if (encode_open_type(buf, buflen, &len, ifp, ifp_len) < 0)
00513 return -1;
00514
00515
00516 switch (s->error_correction_scheme)
00517 {
00518 case UDPTL_ERROR_CORRECTION_NONE:
00519
00520 buf[len++] = 0x00;
00521
00522
00523 if (encode_length(buf, &len, 0) < 0)
00524 return -1;
00525 break;
00526 case UDPTL_ERROR_CORRECTION_REDUNDANCY:
00527
00528 buf[len++] = 0x00;
00529 if (s->tx_seq_no > s->error_correction_entries)
00530 entries = s->error_correction_entries;
00531 else
00532 entries = s->tx_seq_no;
00533
00534
00535 if (encode_length(buf, &len, entries) < 0)
00536 return -1;
00537
00538 for (i = 0; i < entries; i++) {
00539 j = (entry - i - 1) & UDPTL_BUF_MASK;
00540 if (encode_open_type(buf, buflen, &len, s->tx[j].buf, s->tx[j].buf_len) < 0) {
00541 if (option_debug) {
00542 ast_log(LOG_DEBUG, "Encoding failed at i=%d, j=%d\n", i, j);
00543 }
00544 return -1;
00545 }
00546 }
00547 break;
00548 case UDPTL_ERROR_CORRECTION_FEC:
00549 span = s->error_correction_span;
00550 entries = s->error_correction_entries;
00551 if (seq < s->error_correction_span*s->error_correction_entries) {
00552
00553 entries = seq/s->error_correction_span;
00554 if (seq < s->error_correction_span)
00555 span = 0;
00556 }
00557
00558 buf[len++] = 0x80;
00559
00560
00561 buf[len++] = 1;
00562 buf[len++] = span;
00563
00564
00565 buf[len++] = entries;
00566 for (m = 0; m < entries; m++) {
00567
00568 limit = (entry + m) & UDPTL_BUF_MASK;
00569 high_tide = 0;
00570 for (i = (limit - span*entries) & UDPTL_BUF_MASK; i != limit; i = (i + entries) & UDPTL_BUF_MASK) {
00571 if (high_tide < s->tx[i].buf_len) {
00572 for (j = 0; j < high_tide; j++)
00573 fec[j] ^= s->tx[i].buf[j];
00574 for ( ; j < s->tx[i].buf_len; j++)
00575 fec[j] = s->tx[i].buf[j];
00576 high_tide = s->tx[i].buf_len;
00577 } else {
00578 for (j = 0; j < s->tx[i].buf_len; j++)
00579 fec[j] ^= s->tx[i].buf[j];
00580 }
00581 }
00582 if (encode_open_type(buf, buflen, &len, fec, high_tide) < 0)
00583 return -1;
00584 }
00585 break;
00586 }
00587
00588 if (s->verbose)
00589 fprintf(stderr, "\n");
00590
00591 s->tx_seq_no++;
00592 return len;
00593 }
00594
00595 int ast_udptl_fd(struct ast_udptl *udptl)
00596 {
00597 return udptl->fd;
00598 }
00599
00600 void ast_udptl_set_data(struct ast_udptl *udptl, void *data)
00601 {
00602 udptl->data = data;
00603 }
00604
00605 void ast_udptl_set_callback(struct ast_udptl *udptl, ast_udptl_callback callback)
00606 {
00607 udptl->callback = callback;
00608 }
00609
00610 void ast_udptl_setnat(struct ast_udptl *udptl, int nat)
00611 {
00612 udptl->nat = nat;
00613 }
00614
00615 static int udptlread(int *id, int fd, short events, void *cbdata)
00616 {
00617 struct ast_udptl *udptl = cbdata;
00618 struct ast_frame *f;
00619
00620 if ((f = ast_udptl_read(udptl))) {
00621 if (udptl->callback)
00622 udptl->callback(udptl, f, udptl->data);
00623 }
00624 return 1;
00625 }
00626
00627 struct ast_frame *ast_udptl_read(struct ast_udptl *udptl)
00628 {
00629 int res;
00630 struct sockaddr_in sin;
00631 socklen_t len;
00632 uint16_t seqno = 0;
00633 uint16_t *udptlheader;
00634
00635 len = sizeof(sin);
00636
00637
00638 res = recvfrom(udptl->fd,
00639 udptl->rawdata + AST_FRIENDLY_OFFSET,
00640 sizeof(udptl->rawdata) - AST_FRIENDLY_OFFSET,
00641 0,
00642 (struct sockaddr *) &sin,
00643 &len);
00644 udptlheader = (uint16_t *)(udptl->rawdata + AST_FRIENDLY_OFFSET);
00645 if (res < 0) {
00646 if (errno != EAGAIN)
00647 ast_log(LOG_WARNING, "UDPTL read error: %s\n", strerror(errno));
00648 ast_assert(errno != EBADF);
00649 return &ast_null_frame;
00650 }
00651
00652
00653 if (!udptl->them.sin_addr.s_addr || !udptl->them.sin_port)
00654 return &ast_null_frame;
00655
00656 if (udptl->nat) {
00657
00658 if ((udptl->them.sin_addr.s_addr != sin.sin_addr.s_addr) ||
00659 (udptl->them.sin_port != sin.sin_port)) {
00660 memcpy(&udptl->them, &sin, sizeof(udptl->them));
00661 ast_log(LOG_DEBUG, "UDPTL NAT: Using address %s:%d\n", ast_inet_ntoa(udptl->them.sin_addr), ntohs(udptl->them.sin_port));
00662 }
00663 }
00664
00665 if (udptl_debug_test_addr(&sin)) {
00666 ast_verbose("Got UDPTL packet from %s:%d (type %d, seq %d, len %d)\n",
00667 ast_inet_ntoa(sin.sin_addr), ntohs(sin.sin_port), 0, seqno, res);
00668 }
00669 #if 0
00670 printf("Got UDPTL packet from %s:%d (seq %d, len = %d)\n", ast_inet_ntoa(sin.sin_addr), ntohs(sin.sin_port), seqno, res);
00671 #endif
00672 if (udptl_rx_packet(udptl, udptl->rawdata + AST_FRIENDLY_OFFSET, res) < 1)
00673 return &ast_null_frame;
00674
00675 return &udptl->f[0];
00676 }
00677
00678 void ast_udptl_offered_from_local(struct ast_udptl* udptl, int local)
00679 {
00680 if (udptl)
00681 udptl->udptl_offered_from_local = local;
00682 else
00683 ast_log(LOG_WARNING, "udptl structure is null\n");
00684 }
00685
00686 int ast_udptl_get_error_correction_scheme(struct ast_udptl* udptl)
00687 {
00688 if (udptl)
00689 return udptl->error_correction_scheme;
00690 else {
00691 ast_log(LOG_WARNING, "udptl structure is null\n");
00692 return -1;
00693 }
00694 }
00695
00696 void ast_udptl_set_error_correction_scheme(struct ast_udptl* udptl, int ec)
00697 {
00698 if (udptl) {
00699 switch (ec) {
00700 case UDPTL_ERROR_CORRECTION_FEC:
00701 udptl->error_correction_scheme = UDPTL_ERROR_CORRECTION_FEC;
00702 break;
00703 case UDPTL_ERROR_CORRECTION_REDUNDANCY:
00704 udptl->error_correction_scheme = UDPTL_ERROR_CORRECTION_REDUNDANCY;
00705 break;
00706 case UDPTL_ERROR_CORRECTION_NONE:
00707 udptl->error_correction_scheme = UDPTL_ERROR_CORRECTION_NONE;
00708 break;
00709 default:
00710 ast_log(LOG_WARNING, "error correction parameter invalid\n");
00711 };
00712 } else
00713 ast_log(LOG_WARNING, "udptl structure is null\n");
00714 }
00715
00716 int ast_udptl_get_local_max_datagram(struct ast_udptl* udptl)
00717 {
00718 if (udptl)
00719 return udptl->local_max_datagram_size;
00720 else {
00721 ast_log(LOG_WARNING, "udptl structure is null\n");
00722 return -1;
00723 }
00724 }
00725
00726 int ast_udptl_get_far_max_datagram(struct ast_udptl* udptl)
00727 {
00728 if (udptl)
00729 return udptl->far_max_datagram_size;
00730 else {
00731 ast_log(LOG_WARNING, "udptl structure is null\n");
00732 return -1;
00733 }
00734 }
00735
00736 void ast_udptl_set_local_max_datagram(struct ast_udptl* udptl, int max_datagram)
00737 {
00738 if (udptl)
00739 udptl->local_max_datagram_size = max_datagram;
00740 else
00741 ast_log(LOG_WARNING, "udptl structure is null\n");
00742 }
00743
00744 void ast_udptl_set_far_max_datagram(struct ast_udptl* udptl, int max_datagram)
00745 {
00746 if (udptl)
00747 udptl->far_max_datagram_size = max_datagram;
00748 else
00749 ast_log(LOG_WARNING, "udptl structure is null\n");
00750 }
00751
00752 struct ast_udptl *ast_udptl_new_with_bindaddr(struct sched_context *sched, struct io_context *io, int callbackmode, struct in_addr addr)
00753 {
00754 struct ast_udptl *udptl;
00755 int x;
00756 int startplace;
00757 int i;
00758 long int flags;
00759
00760 if (!(udptl = ast_calloc(1, sizeof(*udptl))))
00761 return NULL;
00762
00763 if (udptlfectype == 2)
00764 udptl->error_correction_scheme = UDPTL_ERROR_CORRECTION_FEC;
00765 else if (udptlfectype == 1)
00766 udptl->error_correction_scheme = UDPTL_ERROR_CORRECTION_REDUNDANCY;
00767 else
00768 udptl->error_correction_scheme = UDPTL_ERROR_CORRECTION_NONE;
00769 udptl->error_correction_span = udptlfecspan;
00770 udptl->error_correction_entries = udptlfecentries;
00771
00772 udptl->far_max_datagram_size = udptlmaxdatagram;
00773 udptl->local_max_datagram_size = udptlmaxdatagram;
00774
00775 memset(&udptl->rx, 0, sizeof(udptl->rx));
00776 memset(&udptl->tx, 0, sizeof(udptl->tx));
00777 for (i = 0; i <= UDPTL_BUF_MASK; i++) {
00778 udptl->rx[i].buf_len = -1;
00779 udptl->tx[i].buf_len = -1;
00780 }
00781
00782 udptl->them.sin_family = AF_INET;
00783 udptl->us.sin_family = AF_INET;
00784
00785 if ((udptl->fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
00786 free(udptl);
00787 ast_log(LOG_WARNING, "Unable to allocate socket: %s\n", strerror(errno));
00788 return NULL;
00789 }
00790 flags = fcntl(udptl->fd, F_GETFL);
00791 fcntl(udptl->fd, F_SETFL, flags | O_NONBLOCK);
00792 #ifdef SO_NO_CHECK
00793 if (nochecksums)
00794 setsockopt(udptl->fd, SOL_SOCKET, SO_NO_CHECK, &nochecksums, sizeof(nochecksums));
00795 #endif
00796
00797 x = (ast_random() % (udptlend - udptlstart)) + udptlstart;
00798 startplace = x;
00799 for (;;) {
00800 udptl->us.sin_port = htons(x);
00801 udptl->us.sin_addr = addr;
00802 if (bind(udptl->fd, (struct sockaddr *) &udptl->us, sizeof(udptl->us)) == 0)
00803 break;
00804 if (errno != EADDRINUSE) {
00805 ast_log(LOG_WARNING, "Unexpected bind error: %s\n", strerror(errno));
00806 close(udptl->fd);
00807 free(udptl);
00808 return NULL;
00809 }
00810 if (++x > udptlend)
00811 x = udptlstart;
00812 if (x == startplace) {
00813 ast_log(LOG_WARNING, "No UDPTL ports remaining\n");
00814 close(udptl->fd);
00815 free(udptl);
00816 return NULL;
00817 }
00818 }
00819 if (io && sched && callbackmode) {
00820
00821 udptl->sched = sched;
00822 udptl->io = io;
00823 udptl->ioid = ast_io_add(udptl->io, udptl->fd, udptlread, AST_IO_IN, udptl);
00824 }
00825 return udptl;
00826 }
00827
00828 struct ast_udptl *ast_udptl_new(struct sched_context *sched, struct io_context *io, int callbackmode)
00829 {
00830 struct in_addr ia;
00831 memset(&ia, 0, sizeof(ia));
00832 return ast_udptl_new_with_bindaddr(sched, io, callbackmode, ia);
00833 }
00834
00835 int ast_udptl_settos(struct ast_udptl *udptl, int tos)
00836 {
00837 int res;
00838
00839 if ((res = setsockopt(udptl->fd, IPPROTO_IP, IP_TOS, &tos, sizeof(tos))))
00840 ast_log(LOG_WARNING, "UDPTL unable to set TOS to %d\n", tos);
00841 return res;
00842 }
00843
00844 void ast_udptl_set_peer(struct ast_udptl *udptl, struct sockaddr_in *them)
00845 {
00846 udptl->them.sin_port = them->sin_port;
00847 udptl->them.sin_addr = them->sin_addr;
00848 }
00849
00850 void ast_udptl_get_peer(struct ast_udptl *udptl, struct sockaddr_in *them)
00851 {
00852 memset(them, 0, sizeof(*them));
00853 them->sin_family = AF_INET;
00854 them->sin_port = udptl->them.sin_port;
00855 them->sin_addr = udptl->them.sin_addr;
00856 }
00857
00858 void ast_udptl_get_us(struct ast_udptl *udptl, struct sockaddr_in *us)
00859 {
00860 memcpy(us, &udptl->us, sizeof(udptl->us));
00861 }
00862
00863 void ast_udptl_stop(struct ast_udptl *udptl)
00864 {
00865 memset(&udptl->them.sin_addr, 0, sizeof(udptl->them.sin_addr));
00866 memset(&udptl->them.sin_port, 0, sizeof(udptl->them.sin_port));
00867 }
00868
00869 void ast_udptl_destroy(struct ast_udptl *udptl)
00870 {
00871 if (udptl->ioid)
00872 ast_io_remove(udptl->io, udptl->ioid);
00873 if (udptl->fd > -1)
00874 close(udptl->fd);
00875 free(udptl);
00876 }
00877
00878 int ast_udptl_write(struct ast_udptl *s, struct ast_frame *f)
00879 {
00880 int seq;
00881 int len;
00882 int res;
00883 uint8_t buf[LOCAL_FAX_MAX_DATAGRAM * 2];
00884
00885
00886 if (s->them.sin_addr.s_addr == INADDR_ANY)
00887 return 0;
00888
00889
00890 if (f->datalen == 0)
00891 return 0;
00892
00893 if (f->frametype != AST_FRAME_MODEM) {
00894 ast_log(LOG_WARNING, "UDPTL can only send T.38 data\n");
00895 return -1;
00896 }
00897
00898
00899 seq = s->tx_seq_no & 0xFFFF;
00900
00901
00902 len = udptl_build_packet(s, buf, sizeof(buf), f->data, f->datalen);
00903
00904 if (len > 0 && s->them.sin_port && s->them.sin_addr.s_addr) {
00905 if ((res = sendto(s->fd, buf, len, 0, (struct sockaddr *) &s->them, sizeof(s->them))) < 0)
00906 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));
00907 #if 0
00908 printf("Sent %d bytes of UDPTL data to %s:%d\n", res, ast_inet_ntoa(udptl->them.sin_addr), ntohs(udptl->them.sin_port));
00909 #endif
00910 if (udptl_debug_test_addr(&s->them))
00911 ast_verbose("Sent UDPTL packet to %s:%d (type %d, seq %d, len %d)\n",
00912 ast_inet_ntoa(s->them.sin_addr),
00913 ntohs(s->them.sin_port), 0, seq, len);
00914 }
00915
00916 return 0;
00917 }
00918
00919 void ast_udptl_proto_unregister(struct ast_udptl_protocol *proto)
00920 {
00921 struct ast_udptl_protocol *cur;
00922 struct ast_udptl_protocol *prev;
00923
00924 cur = protos;
00925 prev = NULL;
00926 while (cur) {
00927 if (cur == proto) {
00928 if (prev)
00929 prev->next = proto->next;
00930 else
00931 protos = proto->next;
00932 return;
00933 }
00934 prev = cur;
00935 cur = cur->next;
00936 }
00937 }
00938
00939 int ast_udptl_proto_register(struct ast_udptl_protocol *proto)
00940 {
00941 struct ast_udptl_protocol *cur;
00942
00943 cur = protos;
00944 while (cur) {
00945 if (cur->type == proto->type) {
00946 ast_log(LOG_WARNING, "Tried to register same protocol '%s' twice\n", cur->type);
00947 return -1;
00948 }
00949 cur = cur->next;
00950 }
00951 proto->next = protos;
00952 protos = proto;
00953 return 0;
00954 }
00955
00956 static struct ast_udptl_protocol *get_proto(struct ast_channel *chan)
00957 {
00958 struct ast_udptl_protocol *cur;
00959
00960 cur = protos;
00961 while (cur) {
00962 if (cur->type == chan->tech->type)
00963 return cur;
00964 cur = cur->next;
00965 }
00966 return NULL;
00967 }
00968
00969 int ast_udptl_bridge(struct ast_channel *c0, struct ast_channel *c1, int flags, struct ast_frame **fo, struct ast_channel **rc)
00970 {
00971 struct ast_frame *f;
00972 struct ast_channel *who;
00973 struct ast_channel *cs[3];
00974 struct ast_udptl *p0;
00975 struct ast_udptl *p1;
00976 struct ast_udptl_protocol *pr0;
00977 struct ast_udptl_protocol *pr1;
00978 struct sockaddr_in ac0;
00979 struct sockaddr_in ac1;
00980 struct sockaddr_in t0;
00981 struct sockaddr_in t1;
00982 void *pvt0;
00983 void *pvt1;
00984 int to;
00985
00986 ast_channel_lock(c0);
00987 while (ast_channel_trylock(c1)) {
00988 ast_channel_unlock(c0);
00989 usleep(1);
00990 ast_channel_lock(c0);
00991 }
00992 pr0 = get_proto(c0);
00993 pr1 = get_proto(c1);
00994 if (!pr0) {
00995 ast_log(LOG_WARNING, "Can't find native functions for channel '%s'\n", c0->name);
00996 ast_channel_unlock(c0);
00997 ast_channel_unlock(c1);
00998 return -1;
00999 }
01000 if (!pr1) {
01001 ast_log(LOG_WARNING, "Can't find native functions for channel '%s'\n", c1->name);
01002 ast_channel_unlock(c0);
01003 ast_channel_unlock(c1);
01004 return -1;
01005 }
01006 pvt0 = c0->tech_pvt;
01007 pvt1 = c1->tech_pvt;
01008 p0 = pr0->get_udptl_info(c0);
01009 p1 = pr1->get_udptl_info(c1);
01010 if (!p0 || !p1) {
01011
01012 ast_channel_unlock(c0);
01013 ast_channel_unlock(c1);
01014 return -2;
01015 }
01016 if (pr0->set_udptl_peer(c0, p1)) {
01017 ast_log(LOG_WARNING, "Channel '%s' failed to talk to '%s'\n", c0->name, c1->name);
01018 memset(&ac1, 0, sizeof(ac1));
01019 } else {
01020
01021 ast_udptl_get_peer(p1, &ac1);
01022 }
01023 if (pr1->set_udptl_peer(c1, p0)) {
01024 ast_log(LOG_WARNING, "Channel '%s' failed to talk back to '%s'\n", c1->name, c0->name);
01025 memset(&ac0, 0, sizeof(ac0));
01026 } else {
01027
01028 ast_udptl_get_peer(p0, &ac0);
01029 }
01030 ast_channel_unlock(c0);
01031 ast_channel_unlock(c1);
01032 cs[0] = c0;
01033 cs[1] = c1;
01034 cs[2] = NULL;
01035 for (;;) {
01036 if ((c0->tech_pvt != pvt0) ||
01037 (c1->tech_pvt != pvt1) ||
01038 (c0->masq || c0->masqr || c1->masq || c1->masqr)) {
01039 ast_log(LOG_DEBUG, "Oooh, something is weird, backing out\n");
01040
01041 return -3;
01042 }
01043 to = -1;
01044 ast_udptl_get_peer(p1, &t1);
01045 ast_udptl_get_peer(p0, &t0);
01046 if (inaddrcmp(&t1, &ac1)) {
01047 ast_log(LOG_DEBUG, "Oooh, '%s' changed end address to %s:%d\n",
01048 c1->name, ast_inet_ntoa(t1.sin_addr), ntohs(t1.sin_port));
01049 ast_log(LOG_DEBUG, "Oooh, '%s' was %s:%d\n",
01050 c1->name, ast_inet_ntoa(ac1.sin_addr), ntohs(ac1.sin_port));
01051 memcpy(&ac1, &t1, sizeof(ac1));
01052 }
01053 if (inaddrcmp(&t0, &ac0)) {
01054 ast_log(LOG_DEBUG, "Oooh, '%s' changed end address to %s:%d\n",
01055 c0->name, ast_inet_ntoa(t0.sin_addr), ntohs(t0.sin_port));
01056 ast_log(LOG_DEBUG, "Oooh, '%s' was %s:%d\n",
01057 c0->name, ast_inet_ntoa(ac0.sin_addr), ntohs(ac0.sin_port));
01058 memcpy(&ac0, &t0, sizeof(ac0));
01059 }
01060 who = ast_waitfor_n(cs, 2, &to);
01061 if (!who) {
01062 ast_log(LOG_DEBUG, "Ooh, empty read...\n");
01063
01064 if (ast_check_hangup(c0) || ast_check_hangup(c1))
01065 break;
01066 continue;
01067 }
01068 f = ast_read(who);
01069 if (!f) {
01070 *fo = f;
01071 *rc = who;
01072 ast_log(LOG_DEBUG, "Oooh, got a %s\n", f ? "digit" : "hangup");
01073
01074 return 0;
01075 } else {
01076 if (f->frametype == AST_FRAME_MODEM) {
01077
01078 if (who == c0) {
01079 ast_write(c1, f);
01080 } else if (who == c1) {
01081 ast_write(c0, f);
01082 }
01083 }
01084 ast_frfree(f);
01085 }
01086
01087 cs[2] = cs[0];
01088 cs[0] = cs[1];
01089 cs[1] = cs[2];
01090 }
01091 return -1;
01092 }
01093
01094 static int udptl_do_debug_ip(int fd, int argc, char *argv[])
01095 {
01096 struct hostent *hp;
01097 struct ast_hostent ahp;
01098 int port;
01099 char *p;
01100 char *arg;
01101
01102 port = 0;
01103 if (argc != 4)
01104 return RESULT_SHOWUSAGE;
01105 arg = argv[3];
01106 p = strstr(arg, ":");
01107 if (p) {
01108 *p = '\0';
01109 p++;
01110 port = atoi(p);
01111 }
01112 hp = ast_gethostbyname(arg, &ahp);
01113 if (hp == NULL)
01114 return RESULT_SHOWUSAGE;
01115 udptldebugaddr.sin_family = AF_INET;
01116 memcpy(&udptldebugaddr.sin_addr, hp->h_addr, sizeof(udptldebugaddr.sin_addr));
01117 udptldebugaddr.sin_port = htons(port);
01118 if (port == 0)
01119 ast_cli(fd, "UDPTL Debugging Enabled for IP: %s\n", ast_inet_ntoa(udptldebugaddr.sin_addr));
01120 else
01121 ast_cli(fd, "UDPTL Debugging Enabled for IP: %s:%d\n", ast_inet_ntoa(udptldebugaddr.sin_addr), port);
01122 udptldebug = 1;
01123 return RESULT_SUCCESS;
01124 }
01125
01126 static int udptl_do_debug(int fd, int argc, char *argv[])
01127 {
01128 if (argc != 2) {
01129 if (argc != 4)
01130 return RESULT_SHOWUSAGE;
01131 return udptl_do_debug_ip(fd, argc, argv);
01132 }
01133 udptldebug = 1;
01134 memset(&udptldebugaddr,0,sizeof(udptldebugaddr));
01135 ast_cli(fd, "UDPTL Debugging Enabled\n");
01136 return RESULT_SUCCESS;
01137 }
01138
01139 static int udptl_nodebug(int fd, int argc, char *argv[])
01140 {
01141 if (argc != 3)
01142 return RESULT_SHOWUSAGE;
01143 udptldebug = 0;
01144 ast_cli(fd,"UDPTL Debugging Disabled\n");
01145 return RESULT_SUCCESS;
01146 }
01147
01148 static char debug_usage[] =
01149 "Usage: udptl debug [ip host[:port]]\n"
01150 " Enable dumping of all UDPTL packets to and from host.\n";
01151
01152 static char nodebug_usage[] =
01153 "Usage: udptl debug off\n"
01154 " Disable all UDPTL debugging\n";
01155
01156 static struct ast_cli_entry cli_udptl_no_debug = {
01157 { "udptl", "no", "debug", NULL },
01158 udptl_nodebug, NULL,
01159 NULL };
01160
01161 static struct ast_cli_entry cli_udptl[] = {
01162 { { "udptl", "debug", NULL },
01163 udptl_do_debug, "Enable UDPTL debugging",
01164 debug_usage },
01165
01166 { { "udptl", "debug", "ip", NULL },
01167 udptl_do_debug, "Enable UDPTL debugging on IP",
01168 debug_usage },
01169
01170 { { "udptl", "debug", "off", NULL },
01171 udptl_nodebug, "Disable UDPTL debugging",
01172 nodebug_usage, NULL, &cli_udptl_no_debug },
01173 };
01174
01175 void ast_udptl_reload(void)
01176 {
01177 struct ast_config *cfg;
01178 const char *s;
01179
01180 udptlstart = 4500;
01181 udptlend = 4999;
01182 udptlfectype = 0;
01183 udptlfecentries = 0;
01184 udptlfecspan = 0;
01185 udptlmaxdatagram = 0;
01186
01187 if ((cfg = ast_config_load("udptl.conf"))) {
01188 if ((s = ast_variable_retrieve(cfg, "general", "udptlstart"))) {
01189 udptlstart = atoi(s);
01190 if (udptlstart < 1024) {
01191 ast_log(LOG_WARNING, "Ports under 1024 are not allowed for T.38.\n");
01192 udptlstart = 1024;
01193 }
01194 if (udptlstart > 65535) {
01195 ast_log(LOG_WARNING, "Ports over 65535 are invalid.\n");
01196 udptlstart = 65535;
01197 }
01198 }
01199 if ((s = ast_variable_retrieve(cfg, "general", "udptlend"))) {
01200 udptlend = atoi(s);
01201 if (udptlend < 1024) {
01202 ast_log(LOG_WARNING, "Ports under 1024 are not allowed for T.38.\n");
01203 udptlend = 1024;
01204 }
01205 if (udptlend > 65535) {
01206 ast_log(LOG_WARNING, "Ports over 65535 are invalid.\n");
01207 udptlend = 65535;
01208 }
01209 }
01210 if ((s = ast_variable_retrieve(cfg, "general", "udptlchecksums"))) {
01211 #ifdef SO_NO_CHECK
01212 if (ast_false(s))
01213 nochecksums = 1;
01214 else
01215 nochecksums = 0;
01216 #else
01217 if (ast_false(s))
01218 ast_log(LOG_WARNING, "Disabling UDPTL checksums is not supported on this operating system!\n");
01219 #endif
01220 }
01221 if ((s = ast_variable_retrieve(cfg, "general", "T38FaxUdpEC"))) {
01222 if (strcmp(s, "t38UDPFEC") == 0)
01223 udptlfectype = 2;
01224 else if (strcmp(s, "t38UDPRedundancy") == 0)
01225 udptlfectype = 1;
01226 }
01227 if ((s = ast_variable_retrieve(cfg, "general", "T38FaxMaxDatagram"))) {
01228 udptlmaxdatagram = atoi(s);
01229 if (udptlmaxdatagram < 100) {
01230 ast_log(LOG_WARNING, "Too small T38FaxMaxDatagram size. Defaulting to 100.\n");
01231 udptlmaxdatagram = 100;
01232 }
01233 if (udptlmaxdatagram > LOCAL_FAX_MAX_DATAGRAM) {
01234 ast_log(LOG_WARNING, "Too large T38FaxMaxDatagram size. Defaulting to %d.\n", LOCAL_FAX_MAX_DATAGRAM);
01235 udptlmaxdatagram = LOCAL_FAX_MAX_DATAGRAM;
01236 }
01237 }
01238 if ((s = ast_variable_retrieve(cfg, "general", "UDPTLFECentries"))) {
01239 udptlfecentries = atoi(s);
01240 if (udptlfecentries < 1) {
01241 ast_log(LOG_WARNING, "Too small UDPTLFECentries value. Defaulting to 1.\n");
01242 udptlfecentries = 1;
01243 }
01244 if (udptlfecentries > MAX_FEC_ENTRIES) {
01245 ast_log(LOG_WARNING, "Too large UDPTLFECentries value. Defaulting to %d.\n", MAX_FEC_ENTRIES);
01246 udptlfecentries = MAX_FEC_ENTRIES;
01247 }
01248 }
01249 if ((s = ast_variable_retrieve(cfg, "general", "UDPTLFECspan"))) {
01250 udptlfecspan = atoi(s);
01251 if (udptlfecspan < 1) {
01252 ast_log(LOG_WARNING, "Too small UDPTLFECspan value. Defaulting to 1.\n");
01253 udptlfecspan = 1;
01254 }
01255 if (udptlfecspan > MAX_FEC_SPAN) {
01256 ast_log(LOG_WARNING, "Too large UDPTLFECspan value. Defaulting to %d.\n", MAX_FEC_SPAN);
01257 udptlfecspan = MAX_FEC_SPAN;
01258 }
01259 }
01260 ast_config_destroy(cfg);
01261 }
01262 if (udptlstart >= udptlend) {
01263 ast_log(LOG_WARNING, "Unreasonable values for UDPTL start/end\n");
01264 udptlstart = 4500;
01265 udptlend = 4999;
01266 }
01267 if (option_verbose > 1)
01268 ast_verbose(VERBOSE_PREFIX_2 "UDPTL allocating from port range %d -> %d\n", udptlstart, udptlend);
01269 }
01270
01271 void ast_udptl_init(void)
01272 {
01273 ast_cli_register_multiple(cli_udptl, sizeof(cli_udptl) / sizeof(struct ast_cli_entry));
01274 ast_udptl_reload();
01275 }