void eXosip_get_localip_from_via(osip_message_t *mesg,char **locip){
osip_via_t *via=NULL;
char *host;
via=(osip_via_t*)osip_list_get(mesg->vias,0);
if (via==NULL) {
host="15.128.128.93";
eXosip_trace(OSIP_ERROR,("Could not get via:%s"));
}else host=via->host;
eXosip_get_localip_for(host,locip);
}
/* 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 int _sdp_message_get_a_ptime(sdp_message_t *sdp, int mline){
int i,ret;
sdp_attribute_t *attr;
for (i=0;(attr=sdp_message_attribute_get(sdp,mline,i))!=NULL;i++){
if (keywordcmp("ptime",attr->a_att_field)==0){
int nb = sscanf(attr->a_att_value,"%i",&ret);
/* the return value may depend on how %n is interpreted by the libc: see manpage*/
if (nb == 1){
return ret;
}else eXosip_trace(OSIP_WARNING,("sdp has a strange a=ptime line (%s) ",attr->a_att_value));
}
}
return 0;
}
/* return the value of attr "field" for payload pt at line pos (field=rtpmap,fmtp...)*/
char *sdp_message_a_attr_value_get_with_pt(sdp_message_t *sdp,int pos,int pt,const char *field)
{
int i,tmppt=0,scanned=0;
char *tmp;
sdp_attribute_t *attr;
for (i=0;(attr=sdp_message_attribute_get(sdp,pos,i))!=NULL;i++){
if (keywordcmp(field,attr->a_att_field)==0 && attr->a_att_value!=NULL){
int nb = sscanf(attr->a_att_value,"%i %n",&tmppt,&scanned);
/* the return value may depend on how %n is interpreted by the libc: see manpage*/
if (nb == 1 || nb==2 ){
if (pt==tmppt){
tmp=attr->a_att_value+scanned;
if (strlen(tmp)>0)
return tmp;
}
}else eXosip_trace(OSIP_WARNING,("sdp has a strange a= line (%s) nb=%i",attr->a_att_value,nb));
}
}
return NULL;
}
void eXosip_get_localip_for(char *address_to_reach,char **loc){
int err,tmp;
struct addrinfo hints;
struct addrinfo *res=NULL;
struct sockaddr_storage addr;
int sock;
#ifdef __APPLE_CC__
int s;
#else
socklen_t s;
#endif
if (eXosip.forced_localip){
*loc=osip_strdup(eXosip.localip);
return;
}
*loc=osip_malloc(MAXHOSTNAMELEN);
strcpy(*loc,"127.0.0.1"); /* always fallback to local loopback */
memset(&hints,0,sizeof(hints));
hints.ai_family=PF_UNSPEC;
hints.ai_socktype=SOCK_DGRAM;
/*hints.ai_flags=AI_NUMERICHOST|AI_CANONNAME;*/
err=getaddrinfo(address_to_reach,"5060",&hints,&res);
if (err!=0){
eXosip_trace(OSIP_ERROR,("Error in getaddrinfo for %s: %s\n",address_to_reach,gai_strerror(err)));
return ;
}
if (res==NULL){
eXosip_trace(OSIP_ERROR,("getaddrinfo reported nothing !"));
abort();
return ;
}
sock=socket(res->ai_family,SOCK_DGRAM,0);
tmp=1;
err=setsockopt(sock,SOL_SOCKET,SO_REUSEADDR,&tmp,sizeof(int));
if (err<0){
eXosip_trace(OSIP_ERROR,("Error in setsockopt: %s\n",strerror(errno)));
abort();
return ;
}
err=connect(sock,res->ai_addr,res->ai_addrlen);
if (err<0) {
eXosip_trace(OSIP_ERROR,("Error in connect: %s\n",strerror(errno)));
abort();
return ;
}
freeaddrinfo(res);
res=NULL;
s=sizeof(addr);
err=getsockname(sock,(struct sockaddr*)&addr,&s);
if (err!=0) {
eXosip_trace(OSIP_ERROR,("Error in getsockname: %s\n",strerror(errno)));
close(sock);
return ;
}
err=getnameinfo((struct sockaddr *)&addr,s,*loc,MAXHOSTNAMELEN,NULL,0,NI_NUMERICHOST);
if (err!=0){
eXosip_trace(OSIP_ERROR,("getnameinfo error:%s",strerror(errno)));
abort();
return ;
}
close(sock);
eXosip_trace(OSIP_INFO1,("Outgoing interface to reach %s is %s.\n",address_to_reach,*loc));
return ;
}
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;
}
}
