/* refuse the line */
static void refuse_mline(sdp_message_t *answer,char *mtype,char *proto, int mline)
{
sdp_message_m_media_add (answer,
osip_strdup (mtype),
int_2char (0), NULL,
osip_strdup (proto));
/* add a payload just to comply with sdp RFC.*/
sdp_message_m_payload_add(answer,mline,int_2char(0));
}
/* to add payloads to the offer, must be called inside the write_offer callback */
void
sdp_context_add_payload (sdp_context_t * ctx, sdp_payload_t * payload, char *media)
{
sdp_message_t *offer = ctx->offer;
char *attr_field;
if (!ctx->incb)
{
eXosip_trace (OSIP_ERROR,
("You must not call sdp_context_add_*_payload outside the write_offer callback\n"));
abort ();
}
if (payload->proto == NULL)
payload->proto = "RTP/AVP";
/*printf("payload->line=%i payload->pt=%i\n",payload->line, payload->pt);*/
if (sdp_message_m_media_get (offer, payload->line) == NULL)
{
/*printf("Adding new mline %s \n",media);*/
/* need a new line */
sdp_message_m_media_add (offer, osip_strdup (media),
int_2char (payload->localport), NULL,
osip_strdup (payload->proto));
if (ctx->relay){
add_relay_info(offer,payload->line,ctx->relay,ctx->relay_session_id);
}
}
sdp_message_m_payload_add (offer, payload->line, int_2char (payload->pt));
if (payload->a_rtpmap != NULL)
{
attr_field =
sstrdup_sprintf ("%i %s", payload->pt,
payload->a_rtpmap);
sdp_message_a_attribute_add (offer, payload->line,
osip_strdup ("rtpmap"), attr_field);
}
if (payload->a_fmtp != NULL)
{
attr_field =
sstrdup_sprintf ("%i %s", payload->pt,
payload->a_fmtp);
sdp_message_a_attribute_add (offer, payload->line, osip_strdup ("fmtp"),
attr_field);
}
if (payload->b_as_bandwidth != 0)
{
if (sdp_message_bandwidth_get(offer,payload->line,0)==NULL){
attr_field =
sstrdup_sprintf ("%i", payload->b_as_bandwidth);
sdp_message_b_bandwidth_add (offer, payload->line, osip_strdup ("AS"),
attr_field);
}
}
}
static void add_payload(sdp_message_t *msg, int line, const PayloadType *pt, bool_t strip_well_known_rtpmaps)
{
char attr[256];
sdp_message_m_payload_add (msg,line, int_2char (payload_type_get_number(pt)));
if (!strip_well_known_rtpmaps || !is_known_rtpmap(pt)){
if (pt->channels>1)
snprintf (attr,sizeof(attr),"%i %s/%i/%i", payload_type_get_number(pt),
pt->mime_type, pt->clock_rate,pt->channels);
else
snprintf (attr,sizeof(attr),"%i %s/%i", payload_type_get_number(pt),
pt->mime_type, pt->clock_rate);
sdp_message_a_attribute_add (msg, line,
osip_strdup ("rtpmap"), osip_strdup(attr));
}
if (pt->recv_fmtp != NULL)
{
snprintf (attr,sizeof(attr),"%i %s", payload_type_get_number(pt),pt->recv_fmtp);
sdp_message_a_attribute_add (msg, line, osip_strdup ("fmtp"),
osip_strdup(attr));
}
}
static sdp_message_t *create_generic_sdp(const SalMediaDescription *desc)
{
sdp_message_t *local;
int inet6;
char sessid[16];
char sessver[16];
snprintf(sessid,16,"%i",desc->session_id);
snprintf(sessver,16,"%i",desc->session_ver);
sdp_message_init (&local);
if (strchr(desc->addr,':')!=NULL){
inet6=1;
}else inet6=0;
sdp_message_v_version_set (local, osip_strdup ("0"));
sdp_message_o_origin_set (local, osip_strdup (desc->username),
osip_strdup (sessid), osip_strdup (sessver),
osip_strdup ("IN"), inet6 ? osip_strdup("IP6") : osip_strdup ("IP4"),
osip_strdup (desc->addr));
sdp_message_s_name_set (local, osip_strdup ("Talk"));
if(!sal_media_description_has_dir (desc,SalStreamSendOnly))
{
sdp_message_c_connection_add (local, -1,
osip_strdup ("IN"), inet6 ? osip_strdup ("IP6") : osip_strdup ("IP4"),
osip_strdup (desc->addr), NULL, NULL);
}
else
{
sdp_message_c_connection_add (local, -1,
osip_strdup ("IN"), inet6 ? osip_strdup ("IP6") : osip_strdup ("IP4"),
inet6 ? osip_strdup ("::0") : osip_strdup ("0.0.0.0"), NULL, NULL);
}
sdp_message_t_time_descr_add (local, osip_strdup ("0"), osip_strdup ("0"));
if (desc->bandwidth>0) sdp_message_b_bandwidth_add (local, -1, osip_strdup ("AS"),
int_2char(desc->bandwidth));
return local;
}
static void add_line(sdp_message_t *msg, int lineno, const SalStreamDescription *desc){
const char *mt=NULL;
const MSList *elem;
const char *addr;
const char *dir="sendrecv";
int port;
bool_t strip_well_known_rtpmaps;
switch (desc->type) {
case SalAudio:
mt="audio";
break;
case SalVideo:
mt="video";
break;
case SalOther:
mt=desc->typeother;
break;
}
if (desc->candidates[0].addr[0]!='\0'){
addr=desc->candidates[0].addr;
port=desc->candidates[0].port;
}else{
addr=desc->addr;
port=desc->port;
}
/*only add a c= line within the stream description if address are differents*/
if (strcmp(addr,sdp_message_c_addr_get(msg, -1, 0))!=0){
bool_t inet6;
if (strchr(addr,':')!=NULL){
inet6=TRUE;
}else inet6=FALSE;
sdp_message_c_connection_add (msg, lineno,
osip_strdup ("IN"), inet6 ? osip_strdup ("IP6") : osip_strdup ("IP4"),
osip_strdup (addr), NULL, NULL);
}
sdp_message_m_media_add (msg, osip_strdup (mt),
int_2char (port), NULL,
osip_strdup ("RTP/AVP"));
if (desc->bandwidth>0) sdp_message_b_bandwidth_add (msg, lineno, osip_strdup ("AS"),
int_2char(desc->bandwidth));
if (desc->ptime>0) sdp_message_a_attribute_add(msg,lineno,osip_strdup("ptime"),
int_2char(desc->ptime));
strip_well_known_rtpmaps=ms_list_size(desc->payloads)>5;
if (desc->payloads){
for(elem=desc->payloads;elem!=NULL;elem=elem->next){
add_payload(msg, lineno, (PayloadType*)elem->data,strip_well_known_rtpmaps);
}
}else{
/* to comply with SDP we cannot have an empty payload type number list */
/* as it happens only when mline is declined with a zero port, it does not matter to put whatever codec*/
sdp_message_m_payload_add (msg,lineno, int_2char (0));
}
switch(desc->dir){
case SalStreamSendRecv:
/*dir="sendrecv";*/
dir=NULL;
break;
case SalStreamRecvOnly:
dir="recvonly";
break;
case SalStreamSendOnly:
dir="sendonly";
break;
case SalStreamInactive:
dir="inactive";
break;
}
if (dir) sdp_message_a_attribute_add (msg, lineno, osip_strdup (dir),NULL);
}
char *
sdp_context_get_answer ( sdp_context_t *ctx,sdp_message_t *remote)
{
sdp_message_t *answer=NULL;
char *mtype=NULL, *tmp=NULL;
char *proto=NULL, *port=NULL, *pt=NULL;
int i, j, ncodec, m_lines_accepted = 0;
int err;
sdp_payload_t payload;
sdp_handler_t *sdph=ctx->handler;
sdp_bandwidth_t *sbw=NULL;
char *relay;
tmp = sdp_message_c_addr_get (remote, 0, 0);
if (tmp == NULL)
tmp = sdp_message_c_addr_get (remote, -1, 0);
if (ctx->localip==NULL) {
/* NULL means guess, otherwise we use the address given as localip */
ctx->localip=osip_malloc(128);
eXosip_guess_localip(strchr(tmp,':') ? AF_INET6 : AF_INET,ctx->localip,128);
}
else eXosip_trace(OSIP_INFO1,("Using firewall address in sdp."));
answer = sdp_context_generate_template (ctx);
/* for each m= line */
for (i = 0; !sdp_message_endof_media (remote, i); i++)
{
sdp_payload_init(&payload);
mtype = sdp_message_m_media_get (remote, i);
proto = sdp_message_m_proto_get (remote, i);
port = sdp_message_m_port_get (remote, i);
payload.remoteport = osip_atoi (port);
payload.proto = proto;
payload.line = i;
payload.c_addr = sdp_message_c_addr_get (remote, i, 0);
if (payload.c_addr == NULL)
payload.c_addr = sdp_message_c_addr_get (remote, -1, 0);
/*parse relay address if given*/
relay=sdp_message_a_attr_value_get(remote,i,"relay-addr");
if (relay){
payload.relay_host=parse_relay_addr(relay,&payload.relay_port);
}
payload.relay_session_id=sdp_message_a_attr_value_get(remote,i,"relay-session-id");
/* get application specific bandwidth, if any */
for(j=0;(sbw=sdp_message_bandwidth_get(remote,i,j))!=NULL;j++){
if (strcasecmp(sbw->b_bwtype,"AS")==0) payload.b_as_bandwidth=atoi(sbw->b_bandwidth);
}
payload.a_ptime=_sdp_message_get_a_ptime(remote,i);
if (keywordcmp ("audio", mtype) == 0)
{
if (sdph->accept_audio_codecs != NULL)
{
ncodec = 0;
/* for each payload type */
for (j = 0;
((pt =
sdp_message_m_payload_get (remote, i,
j)) != NULL); j++)
{
payload.pt = osip_atoi (pt);
/* get the rtpmap associated to this codec, if any */
payload.a_rtpmap =
sdp_message_a_attr_value_get_with_pt
(remote, i, payload.pt,
"rtpmap");
/* get the fmtp, if any */
payload.a_fmtp =
sdp_message_a_attr_value_get_with_pt
(remote, i, payload.pt,
"fmtp");
/* ask the application if this codec is supported */
err = sdph->accept_audio_codecs (ctx,
&payload);
if (err == 0 && payload.localport > 0)
{
ncodec++;
/* codec accepted */
if (ncodec == 1)
{
/* first codec accepted, setup the line */
sdp_message_m_media_add
(answer,
osip_strdup
(mtype),
int_2char
(payload.
localport),
NULL,
osip_strdup
(proto));
/* and accept the remote relay addr if we planned to use our own */
if (ctx->relay!=NULL && relay){
add_relay_info(answer,i,relay,payload.relay_session_id);
}
}
/* add the payload, rtpmap, fmtp */
sdp_message_m_payload_add (answer, i,
int_2char
(payload.
pt));
if (payload.a_rtpmap != NULL)
{
sdp_message_a_attribute_add
(answer, i,
osip_strdup
("rtpmap"),
sstrdup_sprintf
("%i %s",
payload.pt,
payload.
a_rtpmap));
}
if (payload.a_fmtp != NULL)
{
sdp_message_a_attribute_add
(answer, i,
osip_strdup
("fmtp"),
sstrdup_sprintf
("%i %s",
payload.pt,
payload.
a_fmtp));
}
if (payload.b_as_bandwidth !=
0)
{
if (sdp_message_bandwidth_get(answer,i,0)==NULL)
sdp_message_b_bandwidth_add
(answer, i,
osip_strdup
("AS"),
sstrdup_sprintf
("%i",
payload.
b_as_bandwidth));
}
}
}
if (ncodec == 0)
{
/* refuse the line */
refuse_mline(answer,mtype,proto,i);
}
else
m_lines_accepted++;
}
else
{
/* refuse this line (leave port to 0) */
refuse_mline(answer,mtype,proto,i);
}
}
else if (keywordcmp ("video", mtype) == 0)
{
if (sdph->accept_video_codecs != NULL)
{
ncodec = 0;
/* for each payload type */
for (j = 0;
((pt =
sdp_message_m_payload_get (remote, i,
j)) != NULL); j++)
{
payload.pt = osip_atoi (pt);
/* get the rtpmap associated to this codec, if any */
payload.a_rtpmap =
sdp_message_a_attr_value_get_with_pt
(remote, i, payload.pt,
"rtpmap");
/* get the fmtp, if any */
payload.a_fmtp =
sdp_message_a_attr_value_get_with_pt
(remote, i, payload.pt,
"fmtp");
/* ask the application if this codec is supported */
err = sdph->accept_video_codecs (ctx,
&payload);
if (err == 0 && payload.localport > 0)
{
ncodec++;
/* codec accepted */
if (ncodec == 1)
{
/* first codec accepted, setup the line */
sdp_message_m_media_add
(answer,
osip_strdup
(mtype),
int_2char
(payload.localport), NULL,
osip_strdup
(proto));
/* and accept the remote relay addr if we planned to use our own */
if (ctx->relay!=NULL && relay){
add_relay_info(answer,i,relay,payload.relay_session_id);
}
}
/* add the payload, rtpmap, fmtp */
sdp_message_m_payload_add (answer, i,
int_2char
(payload.
pt));
if (payload.a_rtpmap != NULL)
{
sdp_message_a_attribute_add
(answer, i,
osip_strdup
("rtpmap"),
sstrdup_sprintf
("%i %s",
payload.pt,
payload.
a_rtpmap));
}
if (payload.a_fmtp != NULL)
{
sdp_message_a_attribute_add
(answer, i,
osip_strdup
("fmtp"),
sstrdup_sprintf
("%i %s",
payload.pt,
payload.
a_fmtp));
}
if (payload.b_as_bandwidth !=0)
{
if (sdp_message_bandwidth_get(answer,i,0)==NULL)
sdp_message_b_bandwidth_add
(answer, i,
osip_strdup
("AS"),
sstrdup_sprintf
("%i",
payload.
b_as_bandwidth));
}
}
}
if (ncodec == 0)
{
/* refuse the line */
refuse_mline(answer,mtype,proto,i);
}
else
m_lines_accepted++;
}
else
{
/* refuse the line */
refuse_mline(answer,mtype,proto,i);
}
}
}
if (ctx->answer!=NULL)
sdp_message_free(ctx->answer);
ctx->answer = answer;
if (m_lines_accepted > 0){
ctx->negoc_status = 200;
sdp_message_to_str(answer,&tmp);
if (ctx->answerstr!=NULL)
osip_free(ctx->answerstr);
ctx->answerstr=tmp;
return tmp;
}else{
ctx->negoc_status = 415;
return NULL;
}
}