2 * Asterisk -- A telephony toolkit for Linux.
4 * UDPTL support for T.38
6 * Copyright (C) 2005, Steve Underwood, partly based on RTP code which is
7 * Copyright (C) 1999-2006, Digium, Inc.
9 * Steve Underwood <steveu@coppice.org>
11 * This program is free software, distributed under the terms of
12 * the GNU General Public License
14 * This version is disclaimed to DIGIUM for inclusion in the Asterisk project.
24 #include <netinet/in.h>
26 #include <sys/socket.h>
27 #include <arpa/inet.h>
32 ASTERISK_FILE_VERSION(__FILE__, "$Revision: 8038 $")
34 #include "asterisk/udptl.h"
35 #include "asterisk/frame.h"
36 #include "asterisk/logger.h"
37 #include "asterisk/options.h"
38 #include "asterisk/channel.h"
39 #include "asterisk/acl.h"
40 #include "asterisk/channel.h"
41 #include "asterisk/config.h"
42 #include "asterisk/lock.h"
43 #include "asterisk/utils.h"
44 #include "asterisk/cli.h"
45 #include "asterisk/unaligned.h"
46 #include "asterisk/utils.h"
48 #define UDPTL_MTU 1200
57 static int udptlstart = 0;
58 static int udptlend = 0;
59 static int udptldebug = 0; /* Are we debugging? */
60 static struct sockaddr_in udptldebugaddr; /* Debug packets to/from this host */
62 static int nochecksums = 0;
64 static int udptlfectype = 0;
65 static int udptlfecentries = 0;
66 static int udptlfecspan = 0;
67 static int udptlmaxdatagram = 0;
69 #define LOCAL_FAX_MAX_DATAGRAM 400
70 #define MAX_FEC_ENTRIES 5
71 #define MAX_FEC_SPAN 5
73 #define UDPTL_BUF_MASK 15
77 uint8_t buf[LOCAL_FAX_MAX_DATAGRAM];
78 } udptl_fec_tx_buffer_t;
82 uint8_t buf[LOCAL_FAX_MAX_DATAGRAM];
83 int fec_len[MAX_FEC_ENTRIES];
84 uint8_t fec[MAX_FEC_ENTRIES][LOCAL_FAX_MAX_DATAGRAM];
87 } udptl_fec_rx_buffer_t;
92 struct ast_frame f[16];
93 unsigned char rawdata[8192 + AST_FRIENDLY_OFFSET];
94 unsigned int lasteventseqn;
97 struct sockaddr_in us;
98 struct sockaddr_in them;
101 struct sched_context *sched;
102 struct io_context *io;
104 ast_udptl_callback callback;
105 int udptl_offered_from_local;
107 /*! This option indicates the error correction scheme used in transmitted UDPTL
109 int error_correction_scheme;
111 /*! This option indicates the number of error correction entries transmitted in
113 int error_correction_entries;
115 /*! This option indicates the span of the error correction entries in transmitted
116 UDPTL packets (FEC only). */
117 int error_correction_span;
119 /*! This option indicates the maximum size of a UDPTL packet that can be accepted by
120 the remote device. */
121 int far_max_datagram_size;
123 /*! This option indicates the maximum size of a UDPTL packet that we are prepared to
125 int local_max_datagram_size;
129 struct sockaddr_in far;
133 int rx_expected_seq_no;
135 udptl_fec_tx_buffer_t tx[UDPTL_BUF_MASK + 1];
136 udptl_fec_rx_buffer_t rx[UDPTL_BUF_MASK + 1];
139 static struct ast_udptl_protocol *protos = NULL;
141 static int udptl_rx_packet(struct ast_udptl *s, uint8_t *buf, int len);
142 static int udptl_build_packet(struct ast_udptl *s, uint8_t *buf, uint8_t *ifp, int ifp_len);
144 static inline int udptl_debug_test_addr(struct sockaddr_in *addr)
148 if (udptldebugaddr.sin_addr.s_addr) {
149 if (((ntohs(udptldebugaddr.sin_port) != 0)
150 && (udptldebugaddr.sin_port != addr->sin_port))
151 || (udptldebugaddr.sin_addr.s_addr != addr->sin_addr.s_addr))
157 static int decode_length(uint8_t *buf, int limit, int *len, int *pvalue)
159 if ((buf[*len] & 0x80) == 0) {
166 if ((buf[*len] & 0x40) == 0) {
167 if (*len >= limit - 1)
169 *pvalue = (buf[*len] & 0x3F) << 8;
171 *pvalue |= buf[*len];
177 *pvalue = (buf[*len] & 0x3F) << 14;
179 /* Indicate we have a fragment */
182 /*- End of function --------------------------------------------------------*/
184 static int decode_open_type(uint8_t *buf, int limit, int *len, const uint8_t **p_object, int *p_num_octets)
190 const uint8_t **pbuf;
192 for (octet_idx = 0, *p_num_octets = 0; ; octet_idx += octet_cnt) {
193 if ((stat = decode_length(buf, limit, len, &octet_cnt)) < 0)
196 *p_num_octets += octet_cnt;
198 pbuf = &p_object[octet_idx];
200 /* Make sure the buffer contains at least the number of bits requested */
201 if ((*len + octet_cnt) > limit)
212 /*- End of function --------------------------------------------------------*/
214 static int encode_length(uint8_t *buf, int *len, int value)
224 if (value < 0x4000) {
226 /* Set the first bit of the first octet */
227 buf[*len] = ((0x8000 | value) >> 8) & 0xFF;
229 buf[*len] = value & 0xFF;
234 multiplier = (value < 0x10000) ? (value >> 14) : 4;
235 /* Set the first 2 bits of the octet */
236 buf[*len] = 0xC0 | multiplier;
238 return multiplier << 14;
240 /*- End of function --------------------------------------------------------*/
242 static int encode_open_type(uint8_t *buf, int *len, const uint8_t *data, int num_octets)
248 /* If open type is of zero length, add a single zero byte (10.1) */
249 if (num_octets == 0) {
254 /* Encode the open type */
255 for (octet_idx = 0; ; num_octets -= enclen, octet_idx += enclen) {
256 if ((enclen = encode_length(buf, len, num_octets)) < 0)
259 memcpy(&buf[*len], &data[octet_idx], enclen);
262 if (enclen >= num_octets)
268 /*- End of function --------------------------------------------------------*/
270 static int udptl_rx_packet(struct ast_udptl *s, uint8_t *buf, int len)
290 const uint8_t *bufs[16];
301 /* Decode seq_number */
304 seq_no = (buf[0] << 8) | buf[1];
307 /* Break out the primary packet */
308 if ((stat = decode_open_type(buf, len, &ptr, &ifp, &ifp_len)) != 0)
310 /* Decode error_recovery */
313 if ((buf[ptr++] & 0x80) == 0) {
314 /* Secondary packet mode for error recovery */
315 if (seq_no > s->rx_seq_no) {
316 /* We received a later packet than we expected, so we need to check if we can fill in the gap from the
317 secondary packets. */
320 if ((stat2 = decode_length(buf, len, &ptr, &count)) < 0)
322 for (i = 0; i < count; i++) {
323 if ((stat = decode_open_type(buf, len, &ptr, &bufs[total_count + i], &lengths[total_count + i])) != 0)
326 total_count += count;
329 /* Step through in reverse order, so we go oldest to newest */
330 for (i = total_count; i > 0; i--) {
331 if (seq_no - i >= s->rx_seq_no) {
332 /* This one wasn't seen before */
333 /* Decode the secondary IFP packet */
334 //fprintf(stderr, "Secondary %d, len %d\n", seq_no - i, lengths[i - 1]);
335 s->f[ifp_no].frametype = AST_FRAME_MODEM;
336 s->f[ifp_no].subclass = AST_MODEM_T38;
338 s->f[ifp_no].mallocd = 0;
339 //s->f[ifp_no].???seq_no = seq_no - i;
340 s->f[ifp_no].datalen = lengths[i - 1];
341 s->f[ifp_no].data = (uint8_t *) bufs[i - 1];
342 s->f[ifp_no].offset = 0;
343 s->f[ifp_no].src = "UDPTL";
345 s->f[ifp_no].prev = &s->f[ifp_no - 1];
346 s->f[ifp_no - 1].next = &s->f[ifp_no];
348 s->f[ifp_no].next = NULL;
353 /* If packets are received out of sequence, we may have already processed this packet from the error
354 recovery information in a packet already received. */
355 if (seq_no >= s->rx_seq_no) {
356 /* Decode the primary IFP packet */
357 s->f[ifp_no].frametype = AST_FRAME_MODEM;
358 s->f[ifp_no].subclass = AST_MODEM_T38;
360 s->f[ifp_no].mallocd = 0;
361 //s->f[ifp_no].???seq_no = seq_no;
362 s->f[ifp_no].datalen = ifp_len;
363 s->f[ifp_no].data = (uint8_t *) ifp;
364 s->f[ifp_no].offset = 0;
365 s->f[ifp_no].src = "UDPTL";
367 s->f[ifp_no].prev = &s->f[ifp_no - 1];
368 s->f[ifp_no - 1].next = &s->f[ifp_no];
370 s->f[ifp_no].next = NULL;
375 /* FEC mode for error recovery */
376 /* Our buffers cannot tolerate overlength IFP packets in FEC mode */
377 if (ifp_len > LOCAL_FAX_MAX_DATAGRAM)
379 /* Update any missed slots in the buffer */
380 for ( ; seq_no > s->rx_seq_no; s->rx_seq_no++) {
381 x = s->rx_seq_no & UDPTL_BUF_MASK;
382 s->rx[x].buf_len = -1;
383 s->rx[x].fec_len[0] = 0;
384 s->rx[x].fec_span = 0;
385 s->rx[x].fec_entries = 0;
388 x = seq_no & UDPTL_BUF_MASK;
390 memset(repaired, 0, sizeof(repaired));
392 /* Save the new IFP packet */
393 memcpy(s->rx[x].buf, ifp, ifp_len);
394 s->rx[x].buf_len = ifp_len;
397 /* Decode the FEC packets */
398 /* The span is defined as an unconstrained integer, but will never be more
399 than a small value. */
405 s->rx[x].fec_span = span;
407 /* The number of entries is defined as a length, but will only ever be a small
408 value. Treat it as such. */
411 entries = buf[ptr++];
412 s->rx[x].fec_entries = entries;
414 /* Decode the elements */
415 for (i = 0; i < entries; i++) {
416 if ((stat = decode_open_type(buf, len, &ptr, &data, &s->rx[x].fec_len[i])) != 0)
418 if (s->rx[x].fec_len[i] > LOCAL_FAX_MAX_DATAGRAM)
421 /* Save the new FEC data */
422 memcpy(s->rx[x].fec[i], data, s->rx[x].fec_len[i]);
424 fprintf(stderr, "FEC: ");
425 for (j = 0; j < s->rx[x].fec_len[i]; j++)
426 fprintf(stderr, "%02X ", data[j]);
427 fprintf(stderr, "\n");
431 /* See if we can reconstruct anything which is missing */
432 /* TODO: this does not comprehensively hunt back and repair everything that is possible */
433 for (l = x; l != ((x - (16 - span*entries)) & UDPTL_BUF_MASK); l = (l - 1) & UDPTL_BUF_MASK) {
434 if (s->rx[l].fec_len[0] <= 0)
436 for (m = 0; m < s->rx[l].fec_entries; m++) {
437 limit = (l + m) & UDPTL_BUF_MASK;
438 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) {
439 if (s->rx[k].buf_len <= 0)
440 which = (which == -1) ? k : -2;
444 for (j = 0; j < s->rx[l].fec_len[m]; j++) {
445 s->rx[which].buf[j] = s->rx[l].fec[m][j];
446 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)
447 s->rx[which].buf[j] ^= (s->rx[k].buf_len > j) ? s->rx[k].buf[j] : 0;
449 s->rx[which].buf_len = s->rx[l].fec_len[m];
450 repaired[which] = TRUE;
454 /* Now play any new packets forwards in time */
455 for (l = (x + 1) & UDPTL_BUF_MASK, j = seq_no - UDPTL_BUF_MASK; l != x; l = (l + 1) & UDPTL_BUF_MASK, j++) {
457 //fprintf(stderr, "Fixed packet %d, len %d\n", j, l);
458 s->f[ifp_no].frametype = AST_FRAME_MODEM;
459 s->f[ifp_no].subclass = AST_MODEM_T38;
461 s->f[ifp_no].mallocd = 0;
462 //s->f[ifp_no].???seq_no = j;
463 s->f[ifp_no].datalen = s->rx[l].buf_len;
464 s->f[ifp_no].data = s->rx[l].buf;
465 s->f[ifp_no].offset = 0;
466 s->f[ifp_no].src = "UDPTL";
468 s->f[ifp_no].prev = &s->f[ifp_no - 1];
469 s->f[ifp_no - 1].next = &s->f[ifp_no];
471 s->f[ifp_no].next = NULL;
475 /* Decode the primary IFP packet */
476 s->f[ifp_no].frametype = AST_FRAME_MODEM;
477 s->f[ifp_no].subclass = AST_MODEM_T38;
479 s->f[ifp_no].mallocd = 0;
480 //s->f[ifp_no].???seq_no = j;
481 s->f[ifp_no].datalen = ifp_len;
482 s->f[ifp_no].data = (uint8_t *) ifp;
483 s->f[ifp_no].offset = 0;
484 s->f[ifp_no].src = "UDPTL";
486 s->f[ifp_no].prev = &s->f[ifp_no - 1];
487 s->f[ifp_no - 1].next = &s->f[ifp_no];
489 s->f[ifp_no].next = NULL;
492 s->rx_seq_no = seq_no + 1;
495 /*- End of function --------------------------------------------------------*/
497 static int udptl_build_packet(struct ast_udptl *s, uint8_t *buf, uint8_t *ifp, int ifp_len)
499 uint8_t fec[LOCAL_FAX_MAX_DATAGRAM];
511 seq = s->tx_seq_no & 0xFFFF;
513 /* Map the sequence number to an entry in the circular buffer */
514 entry = seq & UDPTL_BUF_MASK;
516 /* We save the message in a circular buffer, for generating FEC or
517 redundancy sets later on. */
518 s->tx[entry].buf_len = ifp_len;
519 memcpy(s->tx[entry].buf, ifp, ifp_len);
521 /* Build the UDPTLPacket */
524 /* Encode the sequence number */
525 buf[len++] = (seq >> 8) & 0xFF;
526 buf[len++] = seq & 0xFF;
528 /* Encode the primary IFP packet */
529 if (encode_open_type(buf, &len, ifp, ifp_len) < 0)
532 /* Encode the appropriate type of error recovery information */
533 switch (s->error_correction_scheme)
535 case UDPTL_ERROR_CORRECTION_NONE:
536 /* Encode the error recovery type */
538 /* The number of entries will always be zero, so it is pointless allowing
539 for the fragmented case here. */
540 if (encode_length(buf, &len, 0) < 0)
543 case UDPTL_ERROR_CORRECTION_REDUNDANCY:
544 /* Encode the error recovery type */
546 if (s->tx_seq_no > s->error_correction_entries)
547 entries = s->error_correction_entries;
549 entries = s->tx_seq_no;
550 /* The number of entries will always be small, so it is pointless allowing
551 for the fragmented case here. */
552 if (encode_length(buf, &len, entries) < 0)
554 /* Encode the elements */
555 for (i = 0; i < entries; i++) {
556 j = (entry - i - 1) & UDPTL_BUF_MASK;
557 if (encode_open_type(buf, &len, s->tx[j].buf, s->tx[j].buf_len) < 0)
561 case UDPTL_ERROR_CORRECTION_FEC:
562 span = s->error_correction_span;
563 entries = s->error_correction_entries;
564 if (seq < s->error_correction_span*s->error_correction_entries) {
565 /* In the initial stages, wind up the FEC smoothly */
566 entries = seq/s->error_correction_span;
567 if (seq < s->error_correction_span)
570 /* Encode the error recovery type */
572 /* Span is defined as an inconstrained integer, which it dumb. It will only
573 ever be a small value. Treat it as such. */
576 /* The number of entries is defined as a length, but will only ever be a small
577 value. Treat it as such. */
578 buf[len++] = entries;
579 for (m = 0; m < entries; m++) {
580 /* Make an XOR'ed entry the maximum length */
581 limit = (entry + m) & UDPTL_BUF_MASK;
583 for (i = (limit - span*entries) & UDPTL_BUF_MASK; i != limit; i = (i + entries) & UDPTL_BUF_MASK) {
584 if (high_tide < s->tx[i].buf_len) {
585 for (j = 0; j < high_tide; j++)
586 fec[j] ^= s->tx[i].buf[j];
587 for ( ; j < s->tx[i].buf_len; j++)
588 fec[j] = s->tx[i].buf[j];
589 high_tide = s->tx[i].buf_len;
591 for (j = 0; j < s->tx[i].buf_len; j++)
592 fec[j] ^= s->tx[i].buf[j];
595 if (encode_open_type(buf, &len, fec, high_tide) < 0)
602 fprintf(stderr, "\n");
608 int ast_udptl_fd(struct ast_udptl *udptl)
613 void ast_udptl_set_data(struct ast_udptl *udptl, void *data)
618 void ast_udptl_set_callback(struct ast_udptl *udptl, ast_udptl_callback callback)
620 udptl->callback = callback;
623 void ast_udptl_setnat(struct ast_udptl *udptl, int nat)
628 static int udptlread(int *id, int fd, short events, void *cbdata)
630 struct ast_udptl *udptl = cbdata;
633 if ((f = ast_udptl_read(udptl))) {
635 udptl->callback(udptl, f, udptl->data);
640 struct ast_frame *ast_udptl_read(struct ast_udptl *udptl)
643 struct sockaddr_in sin;
646 char iabuf[INET_ADDRSTRLEN];
647 uint16_t *udptlheader;
648 static struct ast_frame null_frame = { AST_FRAME_NULL, };
652 /* Cache where the header will go */
653 res = recvfrom(udptl->fd,
654 udptl->rawdata + AST_FRIENDLY_OFFSET,
655 sizeof(udptl->rawdata) - AST_FRIENDLY_OFFSET,
657 (struct sockaddr *) &sin,
659 udptlheader = (uint16_t *)(udptl->rawdata + AST_FRIENDLY_OFFSET);
662 ast_log(LOG_WARNING, "UDPTL read error: %s\n", strerror(errno));
668 /* Ignore if the other side hasn't been given an address yet. */
669 if (!udptl->them.sin_addr.s_addr || !udptl->them.sin_port)
673 /* Send to whoever sent to us */
674 if ((udptl->them.sin_addr.s_addr != sin.sin_addr.s_addr) ||
675 (udptl->them.sin_port != sin.sin_port)) {
676 memcpy(&udptl->them, &sin, sizeof(udptl->them));
677 ast_log(LOG_DEBUG, "UDPTL NAT: Using address %s:%d\n", ast_inet_ntoa(iabuf, sizeof(iabuf), udptl->them.sin_addr), ntohs(udptl->them.sin_port));
681 if (udptl_debug_test_addr(&sin)) {
682 ast_verbose("Got UDPTL packet from %s:%d (type %d, seq %d, len %d)\n",
683 ast_inet_ntoa(iabuf, sizeof(iabuf), sin.sin_addr), ntohs(sin.sin_port), 0, seqno, res);
686 printf("Got UDPTL packet from %s:%d (seq %d, len = %d)\n", ast_inet_ntoa(iabuf, sizeof(iabuf), sin.sin_addr), ntohs(sin.sin_port), seqno, res);
688 udptl_rx_packet(udptl, udptl->rawdata + AST_FRIENDLY_OFFSET, res);
693 void ast_udptl_offered_from_local(struct ast_udptl* udptl, int local)
696 udptl->udptl_offered_from_local = local;
698 ast_log(LOG_WARNING, "udptl structure is null\n");
701 int ast_udptl_get_error_correction_scheme(struct ast_udptl* udptl)
704 return udptl->error_correction_scheme;
706 ast_log(LOG_WARNING, "udptl structure is null\n");
711 void ast_udptl_set_error_correction_scheme(struct ast_udptl* udptl, int ec)
715 case UDPTL_ERROR_CORRECTION_FEC:
716 udptl->error_correction_scheme = UDPTL_ERROR_CORRECTION_FEC;
718 case UDPTL_ERROR_CORRECTION_REDUNDANCY:
719 udptl->error_correction_scheme = UDPTL_ERROR_CORRECTION_REDUNDANCY;
721 case UDPTL_ERROR_CORRECTION_NONE:
722 udptl->error_correction_scheme = UDPTL_ERROR_CORRECTION_NONE;
725 ast_log(LOG_WARNING, "error correction parameter invalid");
728 ast_log(LOG_WARNING, "udptl structure is null\n");
731 int ast_udptl_get_local_max_datagram(struct ast_udptl* udptl)
734 return udptl->local_max_datagram_size;
736 ast_log(LOG_WARNING, "udptl structure is null\n");
741 int ast_udptl_get_far_max_datagram(struct ast_udptl* udptl)
744 return udptl->far_max_datagram_size;
746 ast_log(LOG_WARNING, "udptl structure is null\n");
751 void ast_udptl_set_local_max_datagram(struct ast_udptl* udptl, int max_datagram)
754 udptl->local_max_datagram_size = max_datagram;
756 ast_log(LOG_WARNING, "udptl structure is null\n");
759 void ast_udptl_set_far_max_datagram(struct ast_udptl* udptl, int max_datagram)
762 udptl->far_max_datagram_size = max_datagram;
764 ast_log(LOG_WARNING, "udptl structure is null\n");
767 struct ast_udptl *ast_udptl_new_with_bindaddr(struct sched_context *sched, struct io_context *io, int callbackmode, struct in_addr addr)
769 struct ast_udptl *udptl;
775 if ((udptl = malloc(sizeof(struct ast_udptl))) == NULL)
777 memset(udptl, 0, sizeof(struct ast_udptl));
779 if (udptlfectype == 2)
780 udptl->error_correction_scheme = UDPTL_ERROR_CORRECTION_FEC;
781 else if (udptlfectype == 1)
782 udptl->error_correction_scheme = UDPTL_ERROR_CORRECTION_REDUNDANCY;
784 udptl->error_correction_scheme = UDPTL_ERROR_CORRECTION_NONE;
785 udptl->error_correction_span = udptlfecspan;
786 udptl->error_correction_entries = udptlfecentries;
788 udptl->far_max_datagram_size = udptlmaxdatagram;
789 udptl->local_max_datagram_size = udptlmaxdatagram;
791 memset(&udptl->rx, 0, sizeof(udptl->rx));
792 memset(&udptl->tx, 0, sizeof(udptl->tx));
793 for (i = 0; i <= UDPTL_BUF_MASK; i++) {
794 udptl->rx[i].buf_len = -1;
795 udptl->tx[i].buf_len = -1;
798 udptl->seqno = rand() & 0xffff;
799 udptl->them.sin_family = AF_INET;
800 udptl->us.sin_family = AF_INET;
802 if ((udptl->fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
804 ast_log(LOG_WARNING, "Unable to allocate socket: %s\n", strerror(errno));
807 flags = fcntl(udptl->fd, F_GETFL);
808 fcntl(udptl->fd, F_SETFL, flags | O_NONBLOCK);
811 setsockopt(udptl->fd, SOL_SOCKET, SO_NO_CHECK, &nochecksums, sizeof(nochecksums));
813 /* Find us a place */
814 x = (rand()%(udptlend - udptlstart)) + udptlstart;
817 udptl->us.sin_port = htons(x);
818 udptl->us.sin_addr = addr;
819 if (bind(udptl->fd, (struct sockaddr *) &udptl->us, sizeof(udptl->us)) == 0)
821 if (errno != EADDRINUSE) {
822 ast_log(LOG_WARNING, "Unexpected bind error: %s\n", strerror(errno));
829 if (x == startplace) {
830 ast_log(LOG_WARNING, "No UDPTL ports remaining\n");
836 if (io && sched && callbackmode) {
837 /* Operate this one in a callback mode */
838 udptl->sched = sched;
840 udptl->ioid = ast_io_add(udptl->io, udptl->fd, udptlread, AST_IO_IN, udptl);
845 struct ast_udptl *ast_udptl_new(struct sched_context *sched, struct io_context *io, int callbackmode)
848 memset(&ia, 0, sizeof(ia));
849 return ast_udptl_new_with_bindaddr(sched, io, callbackmode, ia);
852 int ast_udptl_settos(struct ast_udptl *udptl, int tos)
856 if ((res = setsockopt(udptl->fd, IPPROTO_IP, IP_TOS, &tos, sizeof(tos))))
857 ast_log(LOG_WARNING, "UDPTL unable to set TOS to %d\n", tos);
861 void ast_udptl_set_peer(struct ast_udptl *udptl, struct sockaddr_in *them)
863 udptl->them.sin_port = them->sin_port;
864 udptl->them.sin_addr = them->sin_addr;
867 void ast_udptl_get_peer(struct ast_udptl *udptl, struct sockaddr_in *them)
869 them->sin_family = AF_INET;
870 them->sin_port = udptl->them.sin_port;
871 them->sin_addr = udptl->them.sin_addr;
874 void ast_udptl_get_us(struct ast_udptl *udptl, struct sockaddr_in *us)
876 memcpy(us, &udptl->us, sizeof(udptl->us));
879 void ast_udptl_stop(struct ast_udptl *udptl)
881 memset(&udptl->them.sin_addr, 0, sizeof(udptl->them.sin_addr));
882 memset(&udptl->them.sin_port, 0, sizeof(udptl->them.sin_port));
885 void ast_udptl_destroy(struct ast_udptl *udptl)
888 ast_io_remove(udptl->io, udptl->ioid);
894 int ast_udptl_write(struct ast_udptl *s, struct ast_frame *f)
898 uint8_t buf[LOCAL_FAX_MAX_DATAGRAM];
899 char iabuf[INET_ADDRSTRLEN];
901 /* If we have no peer, return immediately */
902 if (s->them.sin_addr.s_addr == INADDR_ANY)
905 /* If there is no data length, return immediately */
909 if (f->frametype != AST_FRAME_MODEM) {
910 ast_log(LOG_WARNING, "UDPTL can only send T.38 data\n");
914 /* Cook up the UDPTL packet, with the relevant EC info. */
915 len = udptl_build_packet(s, buf, f->data, f->datalen);
917 if (len > 0 && s->them.sin_port && s->them.sin_addr.s_addr) {
918 if ((res = sendto(s->fd, buf, len, 0, (struct sockaddr *) &s->them, sizeof(s->them))) < 0)
919 ast_log(LOG_NOTICE, "UDPTL Transmission error to %s:%d: %s\n", ast_inet_ntoa(iabuf, sizeof(iabuf), s->them.sin_addr), ntohs(s->them.sin_port), strerror(errno));
921 printf("Sent %d bytes of UDPTL data to %s:%d\n", res, ast_inet_ntoa(iabuf, sizeof(iabuf), udptl->them.sin_addr), ntohs(udptl->them.sin_port));
923 if (udptl_debug_test_addr(&s->them))
924 ast_verbose("Sent UDPTL packet to %s:%d (type %d, seq %d, len %d)\n",
925 ast_inet_ntoa(iabuf, sizeof(iabuf), s->them.sin_addr),
926 ntohs(s->them.sin_port), 0, s->seqno, len);
932 void ast_udptl_proto_unregister(struct ast_udptl_protocol *proto)
934 struct ast_udptl_protocol *cur;
935 struct ast_udptl_protocol *prev;
942 prev->next = proto->next;
944 protos = proto->next;
952 int ast_udptl_proto_register(struct ast_udptl_protocol *proto)
954 struct ast_udptl_protocol *cur;
958 if (cur->type == proto->type) {
959 ast_log(LOG_WARNING, "Tried to register same protocol '%s' twice\n", cur->type);
964 proto->next = protos;
969 static struct ast_udptl_protocol *get_proto(struct ast_channel *chan)
971 struct ast_udptl_protocol *cur;
975 if (cur->type == chan->type)
982 int ast_udptl_bridge(struct ast_channel *c0, struct ast_channel *c1, int flags, struct ast_frame **fo, struct ast_channel **rc)
985 struct ast_channel *who;
986 struct ast_channel *cs[3];
987 struct ast_udptl *p0;
988 struct ast_udptl *p1;
989 struct ast_udptl_protocol *pr0;
990 struct ast_udptl_protocol *pr1;
991 struct sockaddr_in ac0;
992 struct sockaddr_in ac1;
993 struct sockaddr_in t0;
994 struct sockaddr_in t1;
995 char iabuf[INET_ADDRSTRLEN];
1000 ast_mutex_lock(&c0->lock);
1001 while (ast_mutex_trylock(&c1->lock)) {
1002 ast_mutex_unlock(&c0->lock);
1004 ast_mutex_lock(&c0->lock);
1006 pr0 = get_proto(c0);
1007 pr1 = get_proto(c1);
1009 ast_log(LOG_WARNING, "Can't find native functions for channel '%s'\n", c0->name);
1010 ast_mutex_unlock(&c0->lock);
1011 ast_mutex_unlock(&c1->lock);
1015 ast_log(LOG_WARNING, "Can't find native functions for channel '%s'\n", c1->name);
1016 ast_mutex_unlock(&c0->lock);
1017 ast_mutex_unlock(&c1->lock);
1020 pvt0 = c0->tech_pvt;
1021 pvt1 = c1->tech_pvt;
1022 p0 = pr0->get_udptl_info(c0);
1023 p1 = pr1->get_udptl_info(c1);
1025 /* Somebody doesn't want to play... */
1026 ast_mutex_unlock(&c0->lock);
1027 ast_mutex_unlock(&c1->lock);
1030 if (pr0->set_udptl_peer(c0, p1)) {
1031 ast_log(LOG_WARNING, "Channel '%s' failed to talk to '%s'\n", c0->name, c1->name);
1033 /* Store UDPTL peer */
1034 ast_udptl_get_peer(p1, &ac1);
1036 if (pr1->set_udptl_peer(c1, p0))
1037 ast_log(LOG_WARNING, "Channel '%s' failed to talk back to '%s'\n", c1->name, c0->name);
1039 /* Store UDPTL peer */
1040 ast_udptl_get_peer(p0, &ac0);
1042 ast_mutex_unlock(&c0->lock);
1043 ast_mutex_unlock(&c1->lock);
1048 if ((c0->tech_pvt != pvt0) ||
1049 (c1->tech_pvt != pvt1) ||
1050 (c0->masq || c0->masqr || c1->masq || c1->masqr)) {
1051 ast_log(LOG_DEBUG, "Oooh, something is weird, backing out\n");
1052 /* Tell it to try again later */
1056 ast_udptl_get_peer(p1, &t1);
1057 ast_udptl_get_peer(p0, &t0);
1058 if (inaddrcmp(&t1, &ac1)) {
1059 ast_log(LOG_DEBUG, "Oooh, '%s' changed end address to %s:%d\n",
1060 c1->name, ast_inet_ntoa(iabuf, sizeof(iabuf), t1.sin_addr), ntohs(t1.sin_port));
1061 ast_log(LOG_DEBUG, "Oooh, '%s' was %s:%d\n",
1062 c1->name, ast_inet_ntoa(iabuf, sizeof(iabuf), ac1.sin_addr), ntohs(ac1.sin_port));
1063 memcpy(&ac1, &t1, sizeof(ac1));
1065 if (inaddrcmp(&t0, &ac0)) {
1066 ast_log(LOG_DEBUG, "Oooh, '%s' changed end address to %s:%d\n",
1067 c0->name, ast_inet_ntoa(iabuf, sizeof(iabuf), t0.sin_addr), ntohs(t0.sin_port));
1068 ast_log(LOG_DEBUG, "Oooh, '%s' was %s:%d\n",
1069 c0->name, ast_inet_ntoa(iabuf, sizeof(iabuf), ac0.sin_addr), ntohs(ac0.sin_port));
1070 memcpy(&ac0, &t0, sizeof(ac0));
1072 who = ast_waitfor_n(cs, 2, &to);
1074 ast_log(LOG_DEBUG, "Ooh, empty read...\n");
1075 /* check for hangup / whentohangup */
1076 if (ast_check_hangup(c0) || ast_check_hangup(c1))
1084 ast_log(LOG_DEBUG, "Oooh, got a %s\n", f ? "digit" : "hangup");
1085 /* That's all we needed */
1088 if (f->frametype == AST_FRAME_MODEM) {
1089 /* Forward T.38 frames if they happen upon us */
1092 } else if (who == c1) {
1098 /* Swap priority. Not that it's a big deal at this point */
1106 static int udptl_do_debug_ip(int fd, int argc, char *argv[])
1109 struct ast_hostent ahp;
1110 char iabuf[INET_ADDRSTRLEN];
1117 return RESULT_SHOWUSAGE;
1119 p = strstr(arg, ":");
1125 hp = ast_gethostbyname(arg, &ahp);
1127 return RESULT_SHOWUSAGE;
1128 udptldebugaddr.sin_family = AF_INET;
1129 memcpy(&udptldebugaddr.sin_addr, hp->h_addr, sizeof(udptldebugaddr.sin_addr));
1130 udptldebugaddr.sin_port = htons(port);
1132 ast_cli(fd, "UDPTL Debugging Enabled for IP: %s\n", ast_inet_ntoa(iabuf, sizeof(iabuf), udptldebugaddr.sin_addr));
1134 ast_cli(fd, "UDPTL Debugging Enabled for IP: %s:%d\n", ast_inet_ntoa(iabuf, sizeof(iabuf), udptldebugaddr.sin_addr), port);
1136 return RESULT_SUCCESS;
1139 static int udptl_do_debug(int fd, int argc, char *argv[])
1143 return RESULT_SHOWUSAGE;
1144 return udptl_do_debug_ip(fd, argc, argv);
1147 memset(&udptldebugaddr,0,sizeof(udptldebugaddr));
1148 ast_cli(fd, "UDPTL Debugging Enabled\n");
1149 return RESULT_SUCCESS;
1152 static int udptl_no_debug(int fd, int argc, char *argv[])
1155 return RESULT_SHOWUSAGE;
1157 ast_cli(fd,"UDPTL Debugging Disabled\n");
1158 return RESULT_SUCCESS;
1161 static char debug_usage[] =
1162 "Usage: udptl debug [ip host[:port]]\n"
1163 " Enable dumping of all UDPTL packets to and from host.\n";
1165 static char no_debug_usage[] =
1166 "Usage: udptl no debug\n"
1167 " Disable all UDPTL debugging\n";
1169 static struct ast_cli_entry cli_debug_ip =
1170 {{ "udptl", "debug", "ip", NULL } , udptl_do_debug, "Enable UDPTL debugging on IP", debug_usage };
1172 static struct ast_cli_entry cli_debug =
1173 {{ "udptl", "debug", NULL } , udptl_do_debug, "Enable UDPTL debugging", debug_usage };
1175 static struct ast_cli_entry cli_no_debug =
1176 {{ "udptl", "no", "debug", NULL } , udptl_no_debug, "Disable UDPTL debugging", no_debug_usage };
1178 void ast_udptl_reload(void)
1180 struct ast_config *cfg;
1186 udptlfecentries = 0;
1188 udptlmaxdatagram = 0;
1190 if ((cfg = ast_config_load("udptl.conf"))) {
1191 if ((s = ast_variable_retrieve(cfg, "general", "udptlstart"))) {
1192 udptlstart = atoi(s);
1193 if (udptlstart < 1024)
1195 if (udptlstart > 65535)
1198 if ((s = ast_variable_retrieve(cfg, "general", "udptlend"))) {
1200 if (udptlend < 1024)
1202 if (udptlend > 65535)
1205 if ((s = ast_variable_retrieve(cfg, "general", "udptlchecksums"))) {
1213 ast_log(LOG_WARNING, "Disabling UDPTL checksums is not supported on this operating system!\n");
1216 if ((s = ast_variable_retrieve(cfg, "general", "T38FaxUdpEC"))) {
1217 if (strcmp(s, "t38UDPFEC") == 0)
1219 else if (strcmp(s, "t38UDPRedundancy") == 0)
1222 if ((s = ast_variable_retrieve(cfg, "general", "T38FaxMaxDatagram"))) {
1223 udptlmaxdatagram = atoi(s);
1224 if (udptlmaxdatagram < 0)
1225 udptlmaxdatagram = 0;
1226 if (udptlmaxdatagram > LOCAL_FAX_MAX_DATAGRAM)
1227 udptlmaxdatagram = LOCAL_FAX_MAX_DATAGRAM;
1229 if ((s = ast_variable_retrieve(cfg, "general", "UDPTLFECentries"))) {
1230 udptlfecentries = atoi(s);
1231 if (udptlfecentries < 0)
1232 udptlfecentries = 0;
1233 if (udptlfecentries > MAX_FEC_ENTRIES)
1234 udptlfecentries = MAX_FEC_ENTRIES;
1236 if ((s = ast_variable_retrieve(cfg, "general", "UDPTLFECspan"))) {
1237 udptlfecspan = atoi(s);
1238 if (udptlfecspan < 0)
1240 if (udptlfecspan > MAX_FEC_SPAN)
1241 udptlfecspan = MAX_FEC_SPAN;
1243 ast_config_destroy(cfg);
1245 if (udptlstart >= udptlend) {
1246 ast_log(LOG_WARNING, "Unreasonable values for UDPTL start/end\n");
1250 if (option_verbose > 1)
1251 ast_verbose(VERBOSE_PREFIX_2 "UDPTL allocating from port range %d -> %d\n", udptlstart, udptlend);
1254 void ast_udptl_init(void)
1256 ast_cli_register(&cli_debug);
1257 ast_cli_register(&cli_debug_ip);
1258 ast_cli_register(&cli_no_debug);