3 Copyright (C) 2010 Simon MORLAT (simon.morlat@free.fr)
5 This program is free software; you can redistribute it and/or
6 modify it under the terms of the GNU General Public License
7 as published by the Free Software Foundation; either version 2
8 of the License, or (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
22 #include "ortp/ortp_srtp.h"
24 #include <eXosip2/eXosip.h>
26 #define keywordcmp(key,b) strncmp(key,b,sizeof(key))
30 static char *make_relay_session_id(const char *username, const char *relay){
31 /*ideally this should be a hash of the parameters with a random part*/
35 long long int res=((long long int)s1)<<32 | (long long int) s2;
37 b64_encode(src, sizeof(long long int), tmp, sizeof(tmp));
38 return osip_strdup(tmp);
42 static void add_relay_info(sdp_message_t *sdp, int mline, const char *relay, const char *relay_session_id){
44 if (relay) sdp_message_a_attribute_add(sdp, mline,
45 osip_strdup ("relay-addr"),osip_strdup(relay));
46 if (relay_session_id) sdp_message_a_attribute_add(sdp, mline,
47 osip_strdup ("relay-session-id"), osip_strdup(relay_session_id));
52 static char * int_2char(int a){
53 char *p=osip_malloc(16);
54 snprintf(p,16,"%i",a);
58 /* return the value of attr "field" for payload pt at line pos (field=rtpmap,fmtp...)*/
59 static const char *sdp_message_a_attr_value_get_with_pt(sdp_message_t *sdp,int pos,int pt,const char *field)
61 int i,tmppt=0,scanned=0;
63 sdp_attribute_t *attr;
64 for (i=0;(attr=sdp_message_attribute_get(sdp,pos,i))!=NULL;i++){
65 if (keywordcmp(field,attr->a_att_field)==0 && attr->a_att_value!=NULL){
66 int nb = sscanf(attr->a_att_value,"%i %n",&tmppt,&scanned);
67 /* the return value may depend on how %n is interpreted by the libc: see manpage*/
68 if (nb == 1 || nb==2 ){
70 tmp=attr->a_att_value+scanned;
74 }else ms_warning("sdp has a strange a= line (%s) nb=%i",attr->a_att_value,nb);
81 /* return the value of attr "field" */
82 static const char *sdp_message_a_attr_value_get(sdp_message_t *sdp,int pos,const char *field)
85 sdp_attribute_t *attr;
86 for (i=0;(attr=sdp_message_attribute_get(sdp,pos,i))!=NULL;i++){
87 if (keywordcmp(field,attr->a_att_field)==0 && attr->a_att_value!=NULL){
88 return attr->a_att_value;
95 static int _sdp_message_get_a_ptime(sdp_message_t *sdp, int mline){
97 sdp_attribute_t *attr;
98 for (i=0;(attr=sdp_message_attribute_get(sdp,mline,i))!=NULL;i++){
99 if (keywordcmp("ptime",attr->a_att_field)==0){
100 int nb = sscanf(attr->a_att_value,"%i",&ret);
101 /* the return value may depend on how %n is interpreted by the libc: see manpage*/
104 }else ms_warning("sdp has a strange a=ptime line (%s) ",attr->a_att_value);
110 static int _sdp_message_get_mline_dir(sdp_message_t *sdp, int mline){
112 sdp_attribute_t *attr;
113 for (i=0;(attr=sdp_message_attribute_get(sdp,mline,i))!=NULL;i++){
114 if (keywordcmp("sendrecv",attr->a_att_field)==0){
115 return SalStreamSendRecv;
116 }else if (keywordcmp("sendonly",attr->a_att_field)==0){
117 return SalStreamSendOnly;
118 }else if (keywordcmp("recvonly",attr->a_att_field)==0){
119 return SalStreamSendOnly;
120 }else if (keywordcmp("inactive",attr->a_att_field)==0){
121 return SalStreamInactive;
124 return SalStreamSendRecv;
127 static sdp_message_t *create_generic_sdp(const SalMediaDescription *desc)
129 sdp_message_t *local;
134 snprintf(sessid,16,"%i",desc->session_id);
135 snprintf(sessver,16,"%i",desc->session_ver);
136 sdp_message_init (&local);
137 if (strchr(desc->addr,':')!=NULL){
140 sdp_message_v_version_set (local, osip_strdup ("0"));
141 sdp_message_o_origin_set (local, osip_strdup (desc->username),
142 osip_strdup (sessid), osip_strdup (sessver),
143 osip_strdup ("IN"), inet6 ? osip_strdup("IP6") : osip_strdup ("IP4"),
144 osip_strdup (desc->addr));
145 sdp_message_s_name_set (local, osip_strdup ("Talk"));
146 if(!sal_media_description_has_dir (desc,SalStreamSendOnly))
148 sdp_message_c_connection_add (local, -1,
149 osip_strdup ("IN"), inet6 ? osip_strdup ("IP6") : osip_strdup ("IP4"),
150 osip_strdup (desc->addr), NULL, NULL);
154 sdp_message_c_connection_add (local, -1,
155 osip_strdup ("IN"), inet6 ? osip_strdup ("IP6") : osip_strdup ("IP4"),
156 inet6 ? osip_strdup ("::0") : osip_strdup ("0.0.0.0"), NULL, NULL);
158 sdp_message_t_time_descr_add (local, osip_strdup ("0"), osip_strdup ("0"));
159 if (desc->bandwidth>0) sdp_message_b_bandwidth_add (local, -1, osip_strdup ("AS"),
160 int_2char(desc->bandwidth));
165 static bool_t is_known_rtpmap(const PayloadType *pt){
166 switch(payload_type_get_number(pt)){
176 static void add_payload(sdp_message_t *msg, int line, const PayloadType *pt, bool_t strip_well_known_rtpmaps)
179 sdp_message_m_payload_add (msg,line, int_2char (payload_type_get_number(pt)));
181 if (!strip_well_known_rtpmaps || !is_known_rtpmap(pt)){
183 snprintf (attr,sizeof(attr),"%i %s/%i/%i", payload_type_get_number(pt),
184 pt->mime_type, pt->clock_rate,pt->channels);
186 snprintf (attr,sizeof(attr),"%i %s/%i", payload_type_get_number(pt),
187 pt->mime_type, pt->clock_rate);
188 sdp_message_a_attribute_add (msg, line,
189 osip_strdup ("rtpmap"), osip_strdup(attr));
192 if (pt->recv_fmtp != NULL)
194 snprintf (attr,sizeof(attr),"%i %s", payload_type_get_number(pt),pt->recv_fmtp);
195 sdp_message_a_attribute_add (msg, line, osip_strdup ("fmtp"),
201 static void add_line(sdp_message_t *msg, int lineno, const SalStreamDescription *desc){
205 const char *dir="sendrecv";
207 bool_t strip_well_known_rtpmaps;
209 switch (desc->type) {
220 if (desc->candidates[0].addr[0]!='\0'){
221 addr=desc->candidates[0].addr;
222 port=desc->candidates[0].port;
227 /*only add a c= line within the stream description if address are differents*/
228 if (strcmp(addr,sdp_message_c_addr_get(msg, -1, 0))!=0){
230 if (strchr(addr,':')!=NULL){
233 sdp_message_c_connection_add (msg, lineno,
234 osip_strdup ("IN"), inet6 ? osip_strdup ("IP6") : osip_strdup ("IP4"),
235 osip_strdup (addr), NULL, NULL);
238 if (desc->proto == SalProtoRtpSavp) {
241 sdp_message_m_media_add (msg, osip_strdup (mt),
242 int_2char (port), NULL,
243 osip_strdup ("RTP/SAVP"));
245 /* add crypto lines */
246 for(i=0; i<SAL_CRYPTO_ALGO_MAX; i++) {
248 switch (desc->crypto[i].algo) {
249 case AES_128_SHA1_80:
250 snprintf(buffer, 1024, "%d %s inline:%s",
251 desc->crypto[i].tag, "AES_CM_128_HMAC_SHA1_80", desc->crypto[i].master_key);
252 sdp_message_a_attribute_add(msg, lineno, osip_strdup("crypto"),
253 osip_strdup(buffer));
255 case AES_128_SHA1_32:
256 snprintf(buffer, 1024, "%d %s inline:%s",
257 desc->crypto[i].tag, "AES_CM_128_HMAC_SHA1_32", desc->crypto[i].master_key);
258 sdp_message_a_attribute_add(msg, lineno, osip_strdup("crypto"),
259 osip_strdup(buffer));
261 case AES_128_NO_AUTH:
262 ms_warning("Unsupported crypto suite: AES_128_NO_AUTH");
264 case NO_CIPHER_SHA1_80:
265 ms_warning("Unsupported crypto suite: NO_CIPHER_SHA1_80");
268 i = SAL_CRYPTO_ALGO_MAX;
273 sdp_message_m_media_add (msg, osip_strdup (mt),
274 int_2char (port), NULL,
275 osip_strdup ("RTP/AVP"));
278 if (desc->bandwidth>0) sdp_message_b_bandwidth_add (msg, lineno, osip_strdup ("AS"),
279 int_2char(desc->bandwidth));
280 if (desc->ptime>0) sdp_message_a_attribute_add(msg,lineno,osip_strdup("ptime"),
281 int_2char(desc->ptime));
282 strip_well_known_rtpmaps=ms_list_size(desc->payloads)>5;
284 for(elem=desc->payloads;elem!=NULL;elem=elem->next){
285 add_payload(msg, lineno, (PayloadType*)elem->data,strip_well_known_rtpmaps);
288 /* to comply with SDP we cannot have an empty payload type number list */
289 /* as it happens only when mline is declined with a zero port, it does not matter to put whatever codec*/
290 sdp_message_m_payload_add (msg,lineno, int_2char (0));
293 case SalStreamSendRecv:
297 case SalStreamRecvOnly:
300 case SalStreamSendOnly:
303 case SalStreamInactive:
307 if (dir) sdp_message_a_attribute_add (msg, lineno, osip_strdup (dir),NULL);
310 sdp_message_t *media_description_to_sdp(const SalMediaDescription *desc){
312 sdp_message_t *msg=create_generic_sdp(desc);
313 for(i=0;i<desc->nstreams;++i){
314 add_line(msg,i,&desc->streams[i]);
319 static int payload_type_fill_from_rtpmap(PayloadType *pt, const char *rtpmap){
321 PayloadType *refpt=rtp_profile_get_payload(&av_profile,payload_type_get_number(pt));
323 pt->mime_type=ms_strdup(refpt->mime_type);
324 pt->clock_rate=refpt->clock_rate;
326 ms_error("payload number %i has no rtpmap and is unknown in AV Profile, ignored.",
327 payload_type_get_number(pt));
331 char *mime=ms_strdup(rtpmap);
332 char *p=strchr(mime,'/');
341 pt->channels=atoi(chans);
342 }else pt->channels=1;
343 pt->clock_rate=atoi(p);
350 int sdp_to_media_description(sdp_message_t *msg, SalMediaDescription *desc){
352 const char *mtype,*proto,*port,*addr,*number;
353 sdp_bandwidth_t *sbw=NULL;
355 addr=sdp_message_c_addr_get (msg, -1, 0);
357 strncpy(desc->addr,addr,sizeof(desc->addr));
358 for(j=0;(sbw=sdp_message_bandwidth_get(msg,-1,j))!=NULL;++j){
359 if (strcasecmp(sbw->b_bwtype,"AS")==0) desc->bandwidth=atoi(sbw->b_bandwidth);
362 /* for each m= line */
363 for (i=0; !sdp_message_endof_media (msg, i) && i<SAL_MEDIA_DESCRIPTION_MAX_STREAMS; i++)
365 SalStreamDescription *stream=&desc->streams[i];
367 memset(stream,0,sizeof(*stream));
368 mtype = sdp_message_m_media_get(msg, i);
369 proto = sdp_message_m_proto_get (msg, i);
370 port = sdp_message_m_port_get(msg, i);
371 stream->proto=SalProtoUnknown;
373 if (strcasecmp(proto,"RTP/AVP")==0)
374 stream->proto=SalProtoRtpAvp;
375 else if (strcasecmp(proto,"RTP/SAVP")==0){
376 stream->proto=SalProtoRtpSavp;
379 addr = sdp_message_c_addr_get (msg, i, 0);
381 strncpy(stream->addr,addr,sizeof(stream->addr));
383 stream->port=atoi(port);
385 stream->ptime=_sdp_message_get_a_ptime(msg,i);
386 if (strcasecmp("audio", mtype) == 0){
387 stream->type=SalAudio;
388 }else if (strcasecmp("video", mtype) == 0){
389 stream->type=SalVideo;
391 stream->type=SalOther;
392 strncpy(stream->typeother,mtype,sizeof(stream->typeother)-1);
394 for(j=0;(sbw=sdp_message_bandwidth_get(msg,i,j))!=NULL;++j){
395 if (strcasecmp(sbw->b_bwtype,"AS")==0) stream->bandwidth=atoi(sbw->b_bandwidth);
397 stream->dir=_sdp_message_get_mline_dir(msg,i);
398 /* for each payload type */
399 for (j=0;((number=sdp_message_m_payload_get (msg, i,j)) != NULL); j++){
400 const char *rtpmap,*fmtp;
401 int ptn=atoi(number);
402 PayloadType *pt=payload_type_new();
403 payload_type_set_number(pt,ptn);
404 /* get the rtpmap associated to this codec, if any */
405 rtpmap=sdp_message_a_attr_value_get_with_pt(msg, i,ptn,"rtpmap");
406 if (payload_type_fill_from_rtpmap(pt,rtpmap)==0){
407 /* get the fmtp, if any */
408 fmtp=sdp_message_a_attr_value_get_with_pt(msg, i, ptn,"fmtp");
409 payload_type_set_send_fmtp(pt,fmtp);
410 stream->payloads=ms_list_append(stream->payloads,pt);
411 ms_message("Found payload %s/%i fmtp=%s",pt->mime_type,pt->clock_rate,
412 pt->send_fmtp ? pt->send_fmtp : "");
416 /* read crypto lines if any */
417 if (stream->proto == SalProtoRtpSavp) {
418 int k, valid_count = 0;
419 sdp_attribute_t *attr;
421 memset(&stream->crypto, 0, sizeof(stream->crypto));
422 for (k=0;valid_count < SAL_CRYPTO_ALGO_MAX && (attr=sdp_message_attribute_get(msg,i,k))!=NULL;k++){
423 char tmp[256], tmp2[256];
424 if (keywordcmp("crypto",attr->a_att_field)==0 && attr->a_att_value!=NULL){
425 int nb = sscanf(attr->a_att_value, "%d %256s inline:%256s",
426 &stream->crypto[valid_count].tag,
429 ms_message("Found valid crypto line (tag:%d algo:'%s' key:'%s'",
430 stream->crypto[valid_count].tag,
434 if (strcmp(tmp, "AES_CM_128_HMAC_SHA1_80") == 0)
435 stream->crypto[valid_count].algo = AES_128_SHA1_80;
436 else if (strcmp(tmp, "AES_CM_128_HMAC_SHA1_32") == 0)
437 stream->crypto[valid_count].algo = AES_128_SHA1_32;
439 ms_warning("Failed to parse crypto-algo: '%s'", tmp);
440 stream->crypto[valid_count].algo = 0;
442 if (stream->crypto[valid_count].algo) {
443 strncpy(stream->crypto[valid_count].master_key, tmp2, 41);
444 stream->crypto[valid_count].master_key[40] = '\0';
445 ms_message("Found valid crypto line (tag:%d algo:'%s' key:'%s'",
446 stream->crypto[valid_count].tag,
448 stream->crypto[valid_count].master_key);
452 ms_warning("sdp has a strange a= line (%s) nb=%i",attr->a_att_value,nb);
456 ms_message("Found: %d valid crypto lines", valid_count);