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/*
Copyright (C) 2005-2009 Michel de Boer <michel@twinklephone.com>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include <iostream>
#include "definitions.h"
#include "hdr_via.h"
#include "util.h"
#include "parse_ctrl.h"
#include "protocol.h"
#include "sockets/url.h"
t_via::t_via() {
port = 0;
ttl = 0;
rport_present = false;
rport = 0;
}
t_via::t_via(const string &_host, const int _port, bool add_rport) {
protocol_name = "SIP";
protocol_version = SIP_VERSION;
transport = "UDP";
host = _host;
branch = RFC3261_COOKIE + random_token(8);
if (_port != get_default_port("sip")) {
port = _port;
} else {
port = 0;
}
ttl = 0;
rport_present = add_rport;
rport = 0;
}
void t_via::add_extension(const t_parameter &p) {
extensions.push_back(p);
}
string t_via::encode(void) const {
string s;
s = protocol_name + '/' + protocol_version + '/' + transport;
s += ' ';
s += host;
if (port > 0) {
s += ':';
s += int2str(port);
}
if (ttl > 0) s += int2str(ttl, ";ttl=%d");
if (maddr.size() > 0) {
s += ";maddr=";
s += maddr;
}
if (received.size() > 0) {
s += ";received=";
s += received;
}
if (rport_present) {
s += ";rport";
if (rport > 0) {
s += "=";
s += int2str(rport);
}
}
if (branch.size() > 0) {
s += ";branch=";
s += branch;
}
s += param_list2str(extensions);
return s;
}
void t_via::get_response_dst(t_ip_port &ip_port) const {
string url_str("sip:");
// RFC 3261 18.2.2
// Determine the address to send a repsonse to
// NOTE: the received-parameter will be added by the listener if needed.
if (tolower(transport) == "tcp") {
// NOTE: The response must be sent over the connection on which
// the request was received. The address returned here is an
// alternative if that connection is closed already.
if (received.size() > 0) {
url_str += received;
} else {
url_str += host;
}
url_str += ":";
// NOTE: The rport parameter is not processed here as it only
// applies to unreliable transports (RFC 3581 4)
url_str += int2str(port);
t_url u(url_str);
list<t_ip_port> ip_list = u.get_h_ip_srv("tcp");
ip_port = ip_list.front();
} else {
if (maddr.size() > 0) {
url_str += maddr;
} else if (received.size() > 0) {
url_str += received;
} else {
url_str += host;
}
// RFC 3581 4
if (rport_present && rport > 0) {
// NOTE: the rport value will be added by the UDP listener
// if the rport parameter without value was present.
url_str += ':';
url_str += int2str(rport);
} else if (port != 0) {
url_str += ':';
url_str += int2str(port);
}
// If there was no maddr parameter, then the URL will always point to
// an IP address; either the host was an IP address or a received parameter
// containing an IP address was added (see RFC 3261 18.2.1)
// If there was an maddr, then the URL can be a domain that could have
// multiple SRV records. RFC 3263 section 5 does not specify what to do in
// this case. So just send the response to the first destination.
t_url u(url_str);
list<t_ip_port> ip_list = u.get_h_ip_srv("udp");
ip_port = ip_list.front();
}
}
bool t_via::rfc3261_compliant(void) const {
return (branch.find(RFC3261_COOKIE) == 0);
}
t_hdr_via::t_hdr_via() : t_header("Via", "v") {}
void t_hdr_via::add_via(const t_via &v) {
populated = true;
via_list.push_back(v);
}
string t_hdr_via::encode(void) const {
return (t_parser::multi_values_as_list ?
t_header::encode() : encode_multi_header());
}
string t_hdr_via::encode_multi_header(void) const {
string s;
if (!populated) return s;
for (list<t_via>::const_iterator i = via_list.begin();
i != via_list.end(); i++)
{
s += (t_parser::compact_headers ? compact_name : header_name);
s += ": ";
s += i->encode();
s += CRLF;
}
return s;
}
string t_hdr_via::encode_value(void) const {
string s;
if (!populated) return s;
for (list<t_via>::const_iterator i = via_list.begin();
i != via_list.end(); i++)
{
if (i != via_list.begin()) s += ",";
s += i->encode();
}
return s;
}
void t_hdr_via::get_response_dst(t_ip_port &ip_port) const {
if (!populated) {
ip_port.clear();
return;
}
via_list.front().get_response_dst(ip_port);
}
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