sdp_message_t *
eXosip_get_sdp_info (osip_message_t * message)
{
osip_content_type_t *ctt;
sdp_message_t *sdp;
osip_body_t *oldbody;
int pos;
if (message == NULL)
return NULL;
/* get content-type info */
ctt = osip_message_get_content_type (message);
if (ctt == NULL)
return NULL; /* previous message was not correct or empty */
if (ctt->type == NULL || ctt->subtype == NULL)
return NULL;
if (osip_strcasecmp (ctt->type, "multipart") == 0)
{
/* probably within the multipart attachement */
} else if (osip_strcasecmp (ctt->type, "application") != 0 ||
osip_strcasecmp (ctt->subtype, "sdp") != 0)
return NULL;
pos = 0;
while (!osip_list_eol (&message->bodies, pos))
{
int i;
oldbody = (osip_body_t *) osip_list_get (&message->bodies, pos);
pos++;
sdp_message_init (&sdp);
i = sdp_message_parse (sdp, oldbody->body);
if (i == 0)
return sdp;
sdp_message_free (sdp);
sdp = NULL;
}
return NULL;
}
static int sip_get_address(osip_message_t *msg, u_int *host, u_short *port)
{
osip_content_type_t *ctt;
sdp_message_t *sdp;
char *tmp;
int i;
int j;
if (NULL == (ctt = osip_message_get_content_type(msg)))
return 0;
if ((NULL == ctt->type) || (NULL == ctt->subtype))
return 0;
if (osip_strcasecmp(ctt->type, "application"))
return 0;
if (osip_strcasecmp(ctt->subtype, "sdp"))
return 0;
for (i = 0; !osip_list_eol(msg->bodies, i); ++i) {
sdp = NULL;
sdp_message_init(&sdp);
tmp = ((osip_body_t *)osip_list_get(msg->bodies, i))->body;
if (sdp_message_parse(sdp, tmp)) {
sdp_message_free(sdp);
continue;
}
for (j = 0; NULL != sdp_message_m_media_get(sdp, j); ++j) {
if (NULL == (tmp = sdp_message_m_port_get(sdp, j)))
continue;
*port = atoi(tmp);
if (NULL == (tmp = sdp_message_c_addr_get(sdp, -1, 0)))
if (NULL == (tmp = sdp_message_c_addr_get(sdp, j, 0)))
continue;
*host = (u_int)inet_addr(tmp);
sdp_message_free(sdp);
return 1;
}
sdp_message_free(sdp);
}
return 0;
}
/*
* Processing.
*
*/
int PLUGIN_PROCESS(int stage, sip_ticket_t *ticket){
/* stage contains the PLUGIN_* value - the stage of SIP processing. */
int sts;
char *buff;
size_t buflen;
osip_body_t *body;
sdp_message_t *sdp;
int content_length;
osip_content_type_t *content_type;
char clen[8]; /* content length: probably never more than 7 digits !*/
//
// check that we have the expected payload "application/sdp"
//
// get content length
content_length=0;
if (ticket->sipmsg && ticket->sipmsg->content_length
&& ticket->sipmsg->content_length->value) {
sts=sscanf(ticket->sipmsg->content_length->value, "%i", &content_length);
}
// check if we have a content type defined and that payload length >0
content_type=osip_message_get_content_type(ticket->sipmsg);
if ((content_length == 0) || (content_type == NULL)
|| (content_type->type == NULL) || (content_type->subtype == NULL)) {
DEBUGC(DBCLASS_PLUGIN, "%s: no content", name);
return STS_SUCCESS;
}
// check content type: must be "application/sdp"
if ((strncmp(content_type->type, "application", sizeof("application")) != 0)
|| (strncmp(content_type->subtype, "sdp", sizeof("sdp")) != 0)) {
DEBUGC(DBCLASS_PLUGIN, "%s: unsupported content-type %s/%s", name,
content_type->type, content_type->subtype);
return STS_SUCCESS;
}
DEBUGC(DBCLASS_PLUGIN, "%s: content-type %s/%s, size=%i", name,
content_type->type, content_type->subtype, content_length);
//
// parse the payload
//
// get a pointer to the payload of the SIP packet
sts = osip_message_get_body(ticket->sipmsg, 0, &body);
if (sts != 0) {
DEBUGC(DBCLASS_PLUGIN, "%s: no body found in message", name);
return STS_SUCCESS;
}
// dump it into a buffer
sts = sip_body_to_str(body, &buff, &buflen);
if (sts != 0) {
WARN("%s: unable to sip_body_to_str", name);
return STS_SUCCESS;
}
// and parse it into an SDP structure
sts = sdp_message_init(&sdp);
sts = sdp_message_parse (sdp, buff);
if (sts != 0) {
WARN("%s: unable to sdp_message_parse() body", name);
DUMP_BUFFER(-1, buff, buflen);
osip_free(buff);
buff=NULL;
sdp_message_free(sdp);
return STS_SUCCESS;
}
osip_free(buff);
buff=NULL;
//
// now do the codec filtering magic...
sdp_filter_codec(sdp);
//
// replace the original payload with the new modified payload
//
// remove old body from SIP packet
sts = osip_list_remove(&(ticket->sipmsg->bodies), 0);
osip_body_free(body);
body=NULL;
// dump new body to buffer
sdp_message_to_str(sdp, &buff);
buflen=strlen(buff);
// free sdp structure (no longer needed)
sdp_message_free(sdp);
sdp=NULL;
// put new body into SIP message
sts=sip_message_set_body(ticket->sipmsg, buff, buflen);
if (sts != 0) {
ERROR("%s: unable to sip_message_set_body body", name);
DUMP_BUFFER(-1, buff, buflen);
buflen=0;
}
// free buffer
osip_free(buff);
buff=NULL;
//
// set new content length
//
// remove old content leght field
osip_content_length_free(ticket->sipmsg->content_length);
ticket->sipmsg->content_length=NULL;
// set new content length
sprintf(clen,"%ld",(long)buflen);
sts = osip_message_set_content_length(ticket->sipmsg, clen);
return STS_SUCCESS;
}
