/**
* Computes, set and return the outbound interface
* based on remote_uri, next_hop_ip, outbound_proxy, route.
*/
int AmBasicSipDialog::getOutboundIf()
{
if (outbound_interface >= 0)
return outbound_interface;
if(AmConfig::SIP_Ifs.size() == 1){
return (outbound_interface = 0);
}
// Destination priority:
// 1. next_hop
// 2. outbound_proxy (if 1st req or force_outbound_proxy)
// 3. first route
// 4. remote URI
string dest_uri;
string dest_ip;
string local_ip;
multimap<string,unsigned short>::iterator if_it;
list<sip_destination> ip_list;
if(!next_hop.empty() &&
!parse_next_hop(stl2cstr(next_hop),ip_list) &&
!ip_list.empty()) {
dest_ip = c2stlstr(ip_list.front().host);
}
else if(!outbound_proxy.empty() &&
(remote_tag.empty() || force_outbound_proxy)) {
dest_uri = outbound_proxy;
}
else if(!route.empty()){
// parse first route
sip_header fr;
fr.value = stl2cstr(route);
sip_uri* route_uri = get_first_route_uri(&fr);
if(!route_uri){
ERROR("Could not parse route (local_tag='%s';route='%s')",
local_tag.c_str(),route.c_str());
goto error;
}
dest_ip = c2stlstr(route_uri->host);
}
else {
dest_uri = remote_uri;
}
if(dest_uri.empty() && dest_ip.empty()) {
ERROR("No destination found (local_tag='%s')",local_tag.c_str());
goto error;
}
if(!dest_uri.empty()){
sip_uri d_uri;
if(parse_uri(&d_uri,dest_uri.c_str(),dest_uri.length()) < 0){
ERROR("Could not parse destination URI (local_tag='%s';dest_uri='%s')",
local_tag.c_str(),dest_uri.c_str());
goto error;
}
dest_ip = c2stlstr(d_uri.host);
}
if(get_local_addr_for_dest(dest_ip,local_ip) < 0){
ERROR("No local address for dest '%s' (local_tag='%s')",dest_ip.c_str(),local_tag.c_str());
goto error;
}
if_it = AmConfig::LocalSIPIP2If.find(local_ip);
if(if_it == AmConfig::LocalSIPIP2If.end()){
ERROR("Could not find a local interface for resolved local IP (local_tag='%s';local_ip='%s')",
local_tag.c_str(), local_ip.c_str());
goto error;
}
setOutboundInterface(if_it->second);
return if_it->second;
error:
WARN("Error while computing outbound interface: default interface will be used instead.");
setOutboundInterface(0);
return 0;
}
int trans_layer::send_request(sip_msg* msg, char* tid, unsigned int& tid_len)
{
// Request-URI
// To
// From
// Call-ID
// CSeq
// Max-Forwards
// Via
// Contact
// Supported / Require
// Content-Length / Content-Type
assert(transport);
tid_len = 0;
if(set_next_hop(msg->route,msg->u.request->ruri_str,
&msg->remote_ip) < 0){
// TODO: error handling
DBG("set_next_hop failed\n");
//delete msg;
return -1;
}
// assume that msg->route headers are not in msg->hdrs
msg->hdrs.insert(msg->hdrs.begin(),msg->route.begin(),msg->route.end());
int request_len = request_line_len(msg->u.request->method_str,
msg->u.request->ruri_str);
char branch_buf[BRANCH_BUF_LEN];
compute_branch(branch_buf,msg->callid->value,msg->cseq->value);
cstring branch(branch_buf,BRANCH_BUF_LEN);
string via(transport->get_local_ip());
if(transport->get_local_port() != 5060)
via += ":" + int2str(transport->get_local_port());
request_len += via_len(stl2cstr(via),branch);
request_len += copy_hdrs_len(msg->hdrs);
string content_len = int2str(msg->body.len);
request_len += content_length_len(stl2cstr(content_len));
request_len += 2/* CRLF end-of-headers*/;
if(msg->body.len){
request_len += msg->body.len;
}
// Allocate new message
sip_msg* p_msg = new sip_msg();
p_msg->buf = new char[request_len];
p_msg->len = request_len;
// generate it
char* c = p_msg->buf;
request_line_wr(&c,msg->u.request->method_str,
msg->u.request->ruri_str);
via_wr(&c,stl2cstr(via),branch);
copy_hdrs_wr(&c,msg->hdrs);
content_length_wr(&c,stl2cstr(content_len));
*c++ = CR;
*c++ = LF;
if(msg->body.len){
memcpy(c,msg->body.s,msg->body.len);
// Not needed by now as the message is finished
//c += body.len;
}
// and parse it
if(parse_sip_msg(p_msg)){
ERROR("Parser failed on generated request\n");
ERROR("Message was: <%.*s>\n",p_msg->len,p_msg->buf);
delete p_msg;
return MALFORMED_SIP_MSG;
}
memcpy(&p_msg->remote_ip,&msg->remote_ip,sizeof(sockaddr_storage));
DBG("Sending to %s:%i <%.*s>\n",
get_addr_str(((sockaddr_in*)&p_msg->remote_ip)->sin_addr).c_str(),
ntohs(((sockaddr_in*)&p_msg->remote_ip)->sin_port),
p_msg->len,p_msg->buf);
trans_bucket* bucket = get_trans_bucket(p_msg->callid->value,
get_cseq(p_msg)->num_str);
bucket->lock();
int send_err = transport->send(&p_msg->remote_ip,p_msg->buf,p_msg->len);
if(send_err < 0){
ERROR("Error from transport layer\n");
delete p_msg;
}
else {
sip_trans* t = bucket->add_trans(p_msg,TT_UAC);
if(p_msg->u.request->method == sip_request::INVITE){
// if transport == UDP
t->reset_timer(STIMER_A,A_TIMER,bucket->get_id());
// for any transport type
t->reset_timer(STIMER_B,B_TIMER,bucket->get_id());
}
else {
// if transport == UDP
t->reset_timer(STIMER_E,E_TIMER,bucket->get_id());
// for any transport type
t->reset_timer(STIMER_F,F_TIMER,bucket->get_id());
}
string t_id = int2hex(bucket->get_id()).substr(5,string::npos)
+ ":" + long2hex((unsigned long)t);
memcpy(tid,t_id.c_str(),t_id.length());
tid_len = t_id.length();
}
bucket->unlock();
return send_err;
}
