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ICEClient.cpp
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ICEClient.cpp
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/**
* This file is part of WebP2P.
*
* WebP2P 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 3 of the License, or
* (at your option) any later version.
*
* WebP2P 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 WebP2P. If not, see <http://www.gnu.org/licenses/>.
*
* Filename: ICEClient.hpp
* Author(s): Dries Staelens
* Copyright: Copyright (c) 2010 Dries Staelens
* Description: Implementation for the class that implements a simplified view
* of the PJICE library.
**/
/* STL includes */
#include <sstream>
#include <string>
#include <iostream>
/* Boost includes */
#include <boost/scoped_array.hpp>
/* WebP2P includes */
#include "ICEClient.hpp"
#include "SessionDescriptor.hpp"
ICEClient::ServerConfiguration::ServerConfiguration(
const std::string& serverConfigString) {
/* TODO: Parse configuration string here */
/* Use hardcoded defaults for now */
stunServerName = "numb.viagenie.ca";
stunServerPort = PJ_STUN_PORT;
turnServerName = "numb.viagenie.ca";
turnServerPort = 3478;
turnUsername = "[email protected]";
turnPassword = "numb123";
}
const std::string& ICEClient::ServerConfiguration::getStunServerName() {
return stunServerName;
}
int ICEClient::ServerConfiguration::getStunServerPort() {
return stunServerPort;
}
const std::string& ICEClient::ServerConfiguration::getTurnServerName() {
return turnServerName;
}
int ICEClient::ServerConfiguration::getTurnServerPort() {
return turnServerPort;
}
const std::string& ICEClient::ServerConfiguration::getTurnUsername() {
return turnUsername;
}
const std::string& ICEClient::ServerConfiguration::getTurnPassword() {
return turnPassword;
}
ICEClient::ICEClient(const std::string& server_cfg) :
icest(NULL),
thread(NULL),
thread_quit_flag(PJ_FALSE),
pool(NULL),
serverConfiguration(server_cfg),
comp_cnt(1) {
initializeClient();
}
ICEClient::~ICEClient() {
shutdownSession();
shutdownTransport();
shutdownClient();
}
static int worker_thread(void *ICEClient_instance) {
while (!static_cast<ICEClient*>(ICEClient_instance)
->handleEvents(500, NULL)) {}
return 0;
}
pj_bool_t ICEClient::handleEvents(unsigned max_msec, unsigned *p_count) {
enum { MAX_NET_EVENTS = 1 };
pj_time_val max_timeout = {0, 0};
pj_time_val timeout = {0, 0};
unsigned count = 0, net_event_count = 0;
int c;
max_timeout.msec = max_msec;
/* Poll the timer to run it and also to retrieve the earliest entry. */
timeout.sec = timeout.msec = 0;
c = pj_timer_heap_poll( ice_cfg.stun_cfg.timer_heap, &timeout );
if (c > 0)
count += c;
/* timer_heap_poll should never ever returns negative value, or otherwise
* ioqueue_poll() will block forever!
*/
pj_assert(timeout.sec >= 0 && timeout.msec >= 0);
if (timeout.msec >= 1000) timeout.msec = 999;
/* compare the value with the timeout to wait from timer, and use the
* minimum value.
*/
if (PJ_TIME_VAL_GT(timeout, max_timeout))
timeout = max_timeout;
/* Poll ioqueue.
* Repeat polling the ioqueue while we have immediate events, because
* timer heap may process more than one events, so if we only process
* one network events at a time (such as when IOCP backend is used),
* the ioqueue may have trouble keeping up with the request rate.
*
* For example, for each send() request, one network event will be
* reported by ioqueue for the send() completion. If we don't poll
* the ioqueue often enough, the send() completion will not be
* reported in timely manner.
*/
do {
c = pj_ioqueue_poll(ice_cfg.stun_cfg.ioqueue, &timeout);
if (c < 0) {
//pj_status_t err = pj_get_netos_error();
pj_thread_sleep(PJ_TIME_VAL_MSEC(timeout));
if (p_count)
*p_count = count;
return thread_quit_flag;
} else if (c == 0) {
break;
} else {
net_event_count += c;
timeout.sec = timeout.msec = 0;
}
} while (c > 0 && net_event_count < MAX_NET_EVENTS);
count += net_event_count;
if (p_count)
*p_count = count;
return thread_quit_flag;
}
/*
* This is the callback that is registered to the ICE stream transport to
* receive notification about incoming data. By "data" it means application
* data such as RTP/RTCP, and not packets that belong to ICE signaling (such
* as STUN connectivity checks or TURN signaling).
*/
static void cb_on_rx_data(pj_ice_strans *ice_st,
unsigned comp_id,
void *pkt, pj_size_t size,
const pj_sockaddr_t *src_addr,
unsigned src_addr_len)
{
//char ipstr[PJ_INET6_ADDRSTRLEN+10];
PJ_UNUSED_ARG(ice_st);
PJ_UNUSED_ARG(src_addr_len);
PJ_UNUSED_ARG(pkt);
std::string receivedText((const char*)pkt, size);
static_cast<ICEClient*>(pj_ice_strans_get_user_data(ice_st))->
callbacks->dataReceived(receivedText);
// Don't do this! It will ruin the packet buffer in case TCP is used!
//((char*)pkt)[size] = '\0';
/*
PJ_LOG(3,(THIS_FILE, "Component %d: received %d bytes data from %s: \"%.*s\"",
comp_id, size,
pj_sockaddr_print(src_addr, ipstr, sizeof(ipstr), 3),
(unsigned)size,
(char*)pkt));*/
}
/*
* This is the callback that is registered to the ICE stream transport to
* receive notification about ICE state progression.
*/
static void cb_on_ice_complete(pj_ice_strans *ice_st,
pj_ice_strans_op op,
pj_status_t status)
{
if(op == PJ_ICE_STRANS_OP_INIT) {
/* Initialization (candidate gathering) */
static_cast<ICEClient*>(pj_ice_strans_get_user_data(ice_st))
->deliverLocalCandidates();
std::cout << "ICEClient: ICE Transport Initiated";
}
else if(op == PJ_ICE_STRANS_OP_NEGOTIATION) {
/* Negotiation */
std::cout << "ICEClient: ICE Negotiation Complete";
static_cast<ICEClient*>(pj_ice_strans_get_user_data(ice_st))->
callbacks->negotiationComplete();
}
else if(op == PJ_ICE_STRANS_OP_KEEP_ALIVE) {
/* This operation is used to report failure in keep-alive operation. */
/* Currently it is only used to report TURN Refresh failure. */
std::cout << "ICEClient: Keep-alive failed";
}
else {
/* Error */
std::cout << "ICEClient: Error in PJNATH library";
}
}
std::string ICEClient::initializeClient() {
pj_status_t status;
/* Initialize libraries */
status = pj_init();
if(status != PJ_SUCCESS) {
return std::string("pj_init() failed");
}
status = pjlib_util_init();
if(status != PJ_SUCCESS) {
return std::string("pjlib_util_init() failed");
}
status = pjnath_init();
if(status != PJ_SUCCESS) {
return std::string("pjnath_init() failed");
}
/* Init ICE settings with default values */
pj_ice_strans_cfg_default(&ice_cfg);
pj_stun_sock_cfg_default(&ice_cfg.stun.cfg);
pj_turn_sock_cfg_default(&ice_cfg.turn.cfg);
/* Create the caching pool factory */
pj_caching_pool_init(&cp, NULL, 0);
ice_cfg.stun_cfg.pf = &cp.factory;
/* Create memory pool */
pool = pj_pool_create(&cp.factory, "web_p2p", 512, 512, NULL);
if(pool == NULL) {
return std::string("pj_pool_create() failed");
}
/* Create timer heap */
status = pj_timer_heap_create(pool, 100, &ice_cfg.stun_cfg.timer_heap);
if(status != PJ_SUCCESS) {
return std::string("pj_timer_heap_create() failed");
}
/* Create ioqueue */
status = pj_ioqueue_create(pool, 16, &ice_cfg.stun_cfg.ioqueue);
if(status != PJ_SUCCESS) {
return std::string("pj_ioqueue_create() failed");
}
/* Create event polling thread */
status = pj_thread_create(
pool, "web_p2p", &worker_thread, this, 0, 0, &thread);
if(status != PJ_SUCCESS) {
return std::string("pj_thread_create() failed");
}
/* Create DNS resolver */
pj_str_t dnsServer;
pj_cstr(&dnsServer, "8.8.8.8");
status = pj_dns_resolver_create(
&cp.factory, "resolver", 0, ice_cfg.stun_cfg.timer_heap,
ice_cfg.stun_cfg.ioqueue, &ice_cfg.resolver);
if(status != PJ_SUCCESS) {
return std::string("pj_dns_resolver() failed");
}
status = pj_dns_resolver_set_ns(ice_cfg.resolver, 1, &dnsServer, NULL);
if(status != PJ_SUCCESS) {
return std::string("pj_dns_resolver_set_ns() failed");
}
/* Maximum number of host candidates */
ice_cfg.stun.max_host_cands = PJ_ICE_ST_MAX_CAND;
/* Configure agressive nomination */
ice_cfg.opt.aggressive = PJ_FALSE;
/* Configure STUN server/port/keep-alive interval */
if(serverConfiguration.getStunServerName().length() > 0) {
pj_cstr(&ice_cfg.stun.server,
serverConfiguration.getStunServerName().c_str());
ice_cfg.stun.port = serverConfiguration.getStunServerPort();
ice_cfg.stun.cfg.ka_interval = 300;
}
/* Configure TURN server */
if(serverConfiguration.getTurnServerName().length()) {
pj_cstr(&ice_cfg.turn.server,
serverConfiguration.getTurnServerName().c_str());
ice_cfg.turn.port = serverConfiguration.getTurnServerPort();
ice_cfg.turn.conn_type = PJ_TURN_TP_UDP;
ice_cfg.turn.alloc_param.ka_interval = 300;
}
/* TURN credentials */
if(serverConfiguration.getTurnUsername().length()) {
ice_cfg.turn.auth_cred.type = PJ_STUN_AUTH_CRED_STATIC;
pj_cstr(&ice_cfg.turn.auth_cred.data.static_cred.username,
serverConfiguration.getTurnUsername().c_str());
ice_cfg.turn.auth_cred.data.static_cred.data_type
= PJ_STUN_PASSWD_PLAIN;
pj_cstr(&ice_cfg.turn.auth_cred.data.static_cred.data,
serverConfiguration.getTurnPassword().c_str());
}
return std::string("initializeClient() succeeded");
}
void ICEClient::shutdownClient() {
if(icest)
pj_ice_strans_destroy(icest);
pj_thread_sleep(500);
thread_quit_flag = PJ_TRUE;
if(thread) {
pj_thread_join(thread);
pj_thread_destroy(thread);
}
if(ice_cfg.stun_cfg.ioqueue)
pj_ioqueue_destroy(ice_cfg.stun_cfg.ioqueue);
if(ice_cfg.stun_cfg.timer_heap)
pj_timer_heap_destroy(ice_cfg.stun_cfg.timer_heap);
pj_caching_pool_destroy(&cp);
pj_shutdown();
}
void ICEClient::initializeTransport() {
if(NULL != icest)
return;
/* init the callback */
pj_ice_strans_cb icecb;
pj_bzero(&icecb, sizeof(icecb));
icecb.on_rx_data = cb_on_rx_data;
icecb.on_ice_complete = cb_on_ice_complete;
/* create the instance */
pj_status_t status = pj_ice_strans_create("web_p2p",
&ice_cfg, comp_cnt, this, &icecb, &icest);
if(status != PJ_SUCCESS)
return;
return;
}
void ICEClient::shutdownTransport() {
if(NULL == icest)
return;
pj_ice_strans_destroy(icest);
icest = NULL;
resetRemoteCandidates();
}
void ICEClient::initializeSession() {
if(icest == NULL)
initializeTransport();
if(pj_ice_strans_has_sess(icest))
return;
//pj_ice_sess_role role = PJ_ICE_SESS_ROLE_CONTROLLING;
pj_ice_sess_role role = PJ_ICE_SESS_ROLE_CONTROLLED;
pj_status_t status;
status = pj_ice_strans_init_ice(icest, role, NULL, NULL);
if (status != PJ_SUCCESS) {
return;
}
resetRemoteCandidates();
}
void ICEClient::shutdownSession() {
if(icest == NULL)
return;
if(!pj_ice_strans_has_sess(icest))
return;
pj_ice_strans_stop_ice(icest);
resetRemoteCandidates();
}
void ICEClient::setCallbacks(Callbacks* callbacks) {
if(NULL == icest)
initializeTransport();
// if(!pj_ice_strans_has_sess(icest))
// initializeSession();
this->callbacks = callbacks;
}
void ICEClient::deliverLocalCandidates() {
if(!pj_ice_strans_has_sess(icest))
initializeSession();
std::string localCandidates = getLocalCandidates();
callbacks->setLocalCandidates(localCandidates);
}
std::string ICEClient::getLocalCandidates() {
pj_status_t status;
pj_str_t local_ufrag, local_pwd;
status = pj_ice_strans_get_ufrag_pwd(icest, &local_ufrag, &local_pwd,
NULL, NULL);
if(status != PJ_SUCCESS)
return std::string("pj_ice_strans_get_ufrag_pwd() failed");
std::stringstream candidateList;
candidateList << "v=0\no=- 3414953978 3414953978 IN IP4 localhost\ns=ice\nt=0 0\n";
candidateList << "a=ice-ufrag:";
candidateList.write(local_ufrag.ptr, local_ufrag.slen);
candidateList << "\na=ice-pwd:";
candidateList.write(local_pwd.ptr, local_pwd.slen);
candidateList << "\n";
for(unsigned comp = 1; comp <= comp_cnt; ++comp) {
char ipaddr[PJ_INET6_ADDRSTRLEN];
unsigned cand_cnt;
pj_ice_sess_cand cand[PJ_ICE_ST_MAX_CAND];
status = pj_ice_strans_get_def_cand(icest, comp, &cand[0]);
if(status != PJ_SUCCESS)
return std::string("pj_ice_strans_get_def_cand() failed");
if(comp == 1) {
candidateList << "m=audio ";
candidateList << (unsigned)pj_sockaddr_get_port(&cand[0].addr);
candidateList << " RTP/AVP 0\nc=IN IP4 ";
candidateList
<< pj_sockaddr_print(&cand[0].addr, ipaddr, sizeof(ipaddr), 0);
candidateList << "\n";
}
else if(comp == 2) {
candidateList << "m=rtcp:";
candidateList << (unsigned)pj_sockaddr_get_port(&cand[0].addr);
candidateList << " IN IP4 ";
candidateList
<< pj_sockaddr_print(&cand[0].addr, ipaddr, sizeof(ipaddr), 0);
candidateList << "\n";
}
else {
candidateList << "a=Xice-defcand:";
candidateList << (unsigned)pj_sockaddr_get_port(&cand[0].addr);
candidateList << " IN IP4 ";
candidateList
<< pj_sockaddr_print(&cand[0].addr, ipaddr, sizeof(ipaddr), 0);
candidateList << "\n";
}
status = pj_ice_strans_enum_cands(icest, comp, &cand_cnt, cand);
if(status != PJ_SUCCESS)
return std::string("pj_ice_strans_enum_cands() failed");
for(unsigned j = 0; j < cand_cnt; ++j) {
candidateList << "a=candidate:";
candidateList.write(
cand[j].foundation.ptr, cand[j].foundation.slen);
candidateList
<< " "
<< (unsigned) cand[j].comp_id
<< " UDP "
<< cand[j].prio
<< " ";
candidateList
<< pj_sockaddr_print(&cand[j].addr, ipaddr, sizeof(ipaddr), 0);
candidateList
<< " "
<< (unsigned) pj_sockaddr_get_port(&cand[j].addr)
<< " typ ";
candidateList << pj_ice_get_cand_type_name(cand[j].type);
candidateList << "\n";
}
}
return candidateList.str();
}
void ICEClient::addRemoteCandidates(const std::string& remoteCandidates) {
try {
SessionDescriptor remoteSDP = SessionDescriptor(remoteCandidates);
SessionDescriptorData& sdp = remoteSDP.getData();
for(std::vector<Attribute>::iterator i = sdp.sessionAttributes.begin();
i != sdp.sessionAttributes.end(); i++) {
if(ValuedAttribute* at = boost::get<ValuedAttribute>(&*i)) {
std::string attributeName = boost::fusion::at_c<0>(*at);
std::string attributeValue = boost::fusion::at_c<1>(*at);
if(attributeName == "ice-ufrag")
remoteConfiguration.ufrag = attributeValue;
else if(attributeName == "ice-pwd")
remoteConfiguration.pwd = attributeValue;
}
}
remoteConfiguration.comp_cnt = 0;
for(std::vector<MediaDescription>::iterator i = sdp.mediaDescriptions.begin();
i != sdp.mediaDescriptions.end(); i++) {
remoteConfiguration.comp_cnt++;
if(i->connectionData.size() >= 1)
{
ConnectionData& cdata = i->connectionData[0];
if(cdata.netType == "IN")
{
int af = (cdata.addressType == "IP4") ?
pj_AF_INET() : pj_AF_INET6();
pj_sockaddr addr;
pj_sockaddr_init(af, &addr, NULL, 0);
pj_str_t temp;
pj_cstr(&temp, cdata.connectionAddress.data());
pj_sockaddr_set_str_addr(af, &addr, &temp);
remoteConfiguration.def_addr.push_back(addr);
}
}
for(std::vector<Attribute>::iterator j = i->mediaAttributes.begin();
j != i->mediaAttributes.end(); j++) {
if(ValuedAttribute* at = boost::get<ValuedAttribute>(&*j)) {
std::string attributeName = boost::fusion::at_c<0>(*at);
std::string attributeValue = boost::fusion::at_c<1>(*at);
if(attributeName == "candidate") {
std::stringstream ss(attributeValue);
pj_ice_sess_cand cand;
std::string foundation;
int comp_id;
std::string transport;
int prio;
std::string ipaddr;
unsigned short port;
std::string skip, type;
ss >> foundation
>> comp_id
>> transport
>> prio
>> ipaddr
>> port
>> skip
>> type;
if(type == "host") {
cand.type = PJ_ICE_CAND_TYPE_HOST;
} else if(type == "srflx") {
cand.type = PJ_ICE_CAND_TYPE_SRFLX;
} else if(type == "relay") {
cand.type = PJ_ICE_CAND_TYPE_RELAYED;
}
cand.comp_id = (pj_uint8_t) comp_id;
cand.prio = prio;
pj_strdup2(pool, &cand.foundation, foundation.c_str());
int af;
if(ipaddr.find(":") == std::string::npos) {
af = pj_AF_INET();
} else {
af = pj_AF_INET6();
}
pj_str_t temp;
pj_cstr(&temp, ipaddr.c_str());
pj_sockaddr_init(af, &cand.addr, NULL, 0);
pj_sockaddr_set_str_addr(af, &cand.addr, &temp);
pj_sockaddr_set_port(&cand.addr, (pj_uint16_t)port);
remoteConfiguration.cand.push_back(cand);
}
}
}
}
pj_str_t rufrag, rpwd;
pj_status_t status;
int cand_cnt = remoteConfiguration.cand.size();
boost::scoped_array<pj_ice_sess_cand> cand(new pj_ice_sess_cand[cand_cnt]);
for(int i = 0; i < cand_cnt; i++) {
cand[i] = remoteConfiguration.cand[i];
}
status = pj_ice_strans_start_ice(icest,
pj_cstr(&rufrag, remoteConfiguration.ufrag.c_str()),
pj_cstr(&rpwd, remoteConfiguration.pwd.c_str()),
cand_cnt,
cand.get());
} catch (std::exception) {
}
}
void ICEClient::sendMessage(std::string message) {
pj_status_t status;
status = pj_ice_strans_sendto(
icest,
1,
message.c_str(),
message.length(),
&remoteConfiguration.def_addr[0],
pj_sockaddr_get_len(&remoteConfiguration.def_addr[0]));
}
void ICEClient::resetRemoteCandidates() {
pj_bzero(&rem, sizeof(rem));
}