/* Extract User-Agent */
static str
getUserAgent(struct sip_msg* msg)
{
static char buf[16] = "unknown-agent"; // buf is here for a reason. don't
static str notfound = {buf, 13}; // use the constant string directly!
str block, server;
char *ptr;
if ((parse_headers(msg, HDR_USERAGENT_F, 0)!=-1) && msg->user_agent &&
msg->user_agent->body.len>0) {
return msg->user_agent->body;
}
// If we can't find user-agent, look after the Server: field
// This is a temporary hack. Normally it should be extracted by ser
// (either as the Server field, or if User-Agent is missing in place
// of the User-Agent field)
block.s = msg->buf;
block.len = msg->len;
ptr = findLineStartingWith(&block, "Server:", True);
if (!ptr)
return notfound;
server.s = ptr + 7;
server.len = findendline(server.s, block.s+block.len-server.s) - server.s;
trim(&server);
if (server.len == 0)
return notfound;
return server;
}
// will return the ip address present in a `c=' line in the given block
// returns: -1 on error, 0 if not found, 1 if found
static int
getMediaIPFromBlock(str *block, str *mediaip)
{
str tokens[3], zone;
char *ptr;
int count;
ptr = findLineStartingWith(block, "c=", False);
if (!ptr) {
mediaip->s = NULL;
mediaip->len = 0;
return 0;
}
zone.s = ptr + 2;
zone.len = findendline(zone.s, block->s + block->len - zone.s) - zone.s;
count = getStrTokens(&zone, tokens, 3);
if (count != 3) {
LOG(L_ERR, "error: mediaproxy/getMediaIPFromBlock(): invalid `c=' "
"line in SDP body\n");
return -1;
}
// can also check if tokens[1] == 'IP4'
*mediaip = tokens[2];
return 1;
}
static int
getMediaStreams(str *sdp, str *sessionIP, StreamInfo *streams, int limit)
{
str tokens[2], block, zone;
char *ptr, *sdpEnd;
int i, count, streamCount, result;
sdpEnd = sdp->s + sdp->len;
for (i=0, block=*sdp; i<limit; i++) {
ptr = findLineStartingWith(&block, "m=", False);
if (!ptr)
break;
zone.s = ptr + 2;
zone.len = findendline(zone.s, sdpEnd - zone.s) - zone.s;
count = getStrTokens(&zone, tokens, 2);
if (count != 2) {
LM_ERR("invalid `m=' line in the SDP body\n");
return -1;
}
streams[i].type = tokens[0];
streams[i].port = tokens[1];
block.s = zone.s + zone.len;
block.len = sdpEnd - block.s;
}
streamCount = i;
for (i=0; i<streamCount; i++) {
block.s = streams[i].port.s;
if (i < streamCount-1)
block.len = streams[i+1].port.s - block.s;
else
block.len = sdpEnd - block.s;
result = getMediaIPFromBlock(&block, &(streams[i].ip));
if (result == -1) {
LM_ERR("parse error while getting the contact IP for the "
"media stream number %d\n", i+1);
return -1;
} else if (result == 0) {
if (sessionIP->s == NULL) {
LM_ERR("media stream number %d doesn't define a contact IP "
"and the session-level IP is missing\n", i+1);
return -1;
}
streams[i].ip = *sessionIP;
streams[i].localIP = 0;
} else {
streams[i].localIP = 1;
}
}
return streamCount;
}
