ZLMediaKit/src/Rtsp/RtspSession.cpp

/*
 * MIT License
 *
 * Copyright (c) 2016-2019 xiongziliang <771730766@qq.com>
 *
 * This file is part of ZLMediaKit(https://github.com/xiongziliang/ZLMediaKit).
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include <atomic>
#include <iomanip>
#include "Common/config.h"
#include "UDPServer.h"
#include "RtspSession.h"
#include "Util/mini.h"
#include "Util/MD5.h"
#include "Util/base64.h"
#include "Util/onceToken.h"
#include "Util/TimeTicker.h"
#include "Util/NoticeCenter.h"
#include "Network/sockutil.h"

#define RTSP_SERVER_SEND_RTCP 0

using namespace std;
using namespace toolkit;

namespace mediakit {

/**
 * rtsp协议有多种方式传输rtp数据包，目前已支持包括以下4种
 * 1: rtp over udp ,这种方式是rtp通过单独的udp端口传输
 * 2: rtp over udp_multicast,这种方式是rtp通过共享udp组播端口传输
 * 3: rtp over tcp,这种方式是通过rtsp信令tcp通道完成传输
 * 4: rtp over http，下面着重讲解：rtp over http
 *
 * rtp over http 是把rtsp协议伪装成http协议以达到穿透防火墙的目的，
 * 此时播放器会发送两次http请求至rtsp服务器，第一次是http get请求，
 * 第二次是http post请求。
 *
 * 这两次请求通过http请求头中的x-sessioncookie键完成绑定
 *
 * 第一次http get请求用于接收rtp、rtcp和rtsp回复，后续该链接不再发送其他请求
 * 第二次http post请求用于发送rtsp请求，rtsp握手结束后可能会断开连接，此时我们还要维持rtp发送
 * 需要指出的是http post请求中的content负载就是base64编码后的rtsp请求包，
 * 播放器会把rtsp请求伪装成http content负载发送至rtsp服务器，然后rtsp服务器又把回复发送给第一次http get请求的tcp链接
 * 这样，对防火墙而言，本次rtsp会话就是两次http请求，防火墙就会放行数据
 *
 * zlmediakit在处理rtsp over http的请求时，会把http poster中的content数据base64解码后转发给http getter处理
 */


//rtsp over http 情况下get请求实例，在请求实例用于接收rtp数据包
static unordered_map<string, weak_ptr<RtspSession> > g_mapGetter;
//对g_mapGetter上锁保护
static recursive_mutex g_mtxGetter;
static int kSockFlags = SOCKET_DEFAULE_FLAGS | FLAG_MORE;

RtspSession::RtspSession(const Socket::Ptr &pSock) : TcpSession(pSock) {
    DebugP(this);
    GET_CONFIG(uint32_t,keep_alive_sec,Rtsp::kKeepAliveSecond);
    pSock->setSendTimeOutSecond(keep_alive_sec);
    //起始接收buffer缓存设置为4K，节省内存
    pSock->setReadBuffer(std::make_shared<BufferRaw>(4 * 1024));
}

RtspSession::~RtspSession() {
    DebugP(this);
}

void RtspSession::onError(const SockException& err) {
	WarnP(this) << err.what();
	if (_rtpType == Rtsp::RTP_MULTICAST) {
		//取消UDP端口监听
		UDPServer::Instance().stopListenPeer(get_peer_ip().data(), this);
	}

	if (_http_x_sessioncookie.size() != 0) {
		//移除http getter的弱引用记录
		lock_guard<recursive_mutex> lock(g_mtxGetter);
		g_mapGetter.erase(_http_x_sessioncookie);
	}

    //流量统计事件广播
    GET_CONFIG(uint32_t,iFlowThreshold,General::kFlowThreshold);
    if(_ui64TotalBytes > iFlowThreshold * 1024){
        bool isPlayer = !_pushSrc;
        NoticeCenter::Instance().emitEvent(Broadcast::kBroadcastFlowReport,
										   _mediaInfo,
										   _ui64TotalBytes,
										   _ticker.createdTime()/1000,
                                           isPlayer,
										   *this);
    }

}

void RtspSession::onManager() {
    GET_CONFIG(uint32_t,handshake_sec,Rtsp::kKeepAliveSecond);
    GET_CONFIG(uint32_t,keep_alive_sec,Rtsp::kKeepAliveSecond);

    if (_ticker.createdTime() > handshake_sec * 1000) {
		if (_strSession.size() == 0) {
			shutdown(SockException(Err_timeout,"illegal connection"));
			return;
		}
	}


	if ((_rtpType == Rtsp::RTP_UDP || _pushSrc ) && _ticker.elapsedTime() > keep_alive_sec * 1000) {
		//如果是推流端或者rtp over udp类型的播放端，那么就做超时检测
        shutdown(SockException(Err_timeout,"rtp over udp session timeouted"));
        return;
	}
}

void RtspSession::onRecv(const Buffer::Ptr &pBuf) {
	_ticker.resetTime();
    _ui64TotalBytes += pBuf->size();
    if (_onRecv) {
		//http poster的请求数据转发给http getter处理
		_onRecv(pBuf);
	} else {
//    	TraceP(this) << pBuf->size() << "\r\n" << pBuf->data();
		input(pBuf->data(),pBuf->size());
	}
}

void RtspSession::onWholeRtspPacket(Parser &parser) {
	string strCmd = parser.Method(); //提取出请求命令字
	_iCseq = atoi(parser["CSeq"].data());
	if(_strContentBase.empty() && strCmd != "GET"){
		_strContentBase = parser.Url();
		_mediaInfo.parse(parser.FullUrl());
        _mediaInfo._schema = RTSP_SCHEMA;
    }

	typedef void (RtspSession::*rtsp_request_handler)(const Parser &parser);
	static unordered_map<string, rtsp_request_handler> s_handler_map;
	static onceToken token( []() {
		s_handler_map.emplace("OPTIONS",&RtspSession::handleReq_Options);
		s_handler_map.emplace("DESCRIBE",&RtspSession::handleReq_Describe);
		s_handler_map.emplace("ANNOUNCE",&RtspSession::handleReq_ANNOUNCE);
		s_handler_map.emplace("RECORD",&RtspSession::handleReq_RECORD);
		s_handler_map.emplace("SETUP",&RtspSession::handleReq_Setup);
		s_handler_map.emplace("PLAY",&RtspSession::handleReq_Play);
		s_handler_map.emplace("PAUSE",&RtspSession::handleReq_Pause);
		s_handler_map.emplace("TEARDOWN",&RtspSession::handleReq_Teardown);
		s_handler_map.emplace("GET",&RtspSession::handleReq_Get);
		s_handler_map.emplace("POST",&RtspSession::handleReq_Post);
		s_handler_map.emplace("SET_PARAMETER",&RtspSession::handleReq_SET_PARAMETER);
		s_handler_map.emplace("GET_PARAMETER",&RtspSession::handleReq_SET_PARAMETER);
	}, []() {});

	auto it = s_handler_map.find(strCmd);
	if (it == s_handler_map.end()) {
        sendRtspResponse("403 Forbidden");
        shutdown(SockException(Err_shutdown,StrPrinter << "403 Forbidden:" << strCmd));
        return;
	}

    auto &fun = it->second;
    try {
        (this->*fun)(parser);
    }catch (SockException &ex){
        if(ex){
            shutdown(ex);
        }
    }catch (exception &ex){
        shutdown(SockException(Err_shutdown,ex.what()));
    }
    parser.Clear();
}

void RtspSession::onRtpPacket(const char *data, uint64_t len) {
	if(!_pushSrc){
		return;
	}

	int trackIdx = -1;
	uint8_t interleaved = data[1];
	if(interleaved %2 == 0){
		trackIdx = getTrackIndexByInterleaved(interleaved);
        if (trackIdx != -1) {
            handleOneRtp(trackIdx,_aTrackInfo[trackIdx],(unsigned char *)data + 4, len - 4);
        }
	}else{
        trackIdx = getTrackIndexByInterleaved(interleaved - 1);
        if (trackIdx != -1) {
            onRtcpPacket(trackIdx, _aTrackInfo[trackIdx], (unsigned char *) data + 4, len - 4);
        }
	}
}

void RtspSession::onRtcpPacket(int iTrackidx, SdpTrack::Ptr &track, unsigned char *pucData, unsigned int uiLen){

}
int64_t RtspSession::getContentLength(Parser &parser) {
	if(parser.Method() == "POST"){
		//http post请求的content数据部分是base64编码后的rtsp请求信令包
		return remainDataSize();
	}
	return RtspSplitter::getContentLength(parser);
}


void RtspSession::handleReq_Options(const Parser &parser) {
	//支持这些命令
	sendRtspResponse("200 OK",{"Public" , "OPTIONS, DESCRIBE, SETUP, TEARDOWN, PLAY, PAUSE, ANNOUNCE, RECORD, SET_PARAMETER, GET_PARAMETER"});
}

void RtspSession::handleReq_ANNOUNCE(const Parser &parser) {
	auto src = dynamic_pointer_cast<RtmpMediaSource>(MediaSource::find(RTSP_SCHEMA,
																	   _mediaInfo._vhost,
																	   _mediaInfo._app,
																	   _mediaInfo._streamid,
																	   false));
	if(src){
		sendRtspResponse("406 Not Acceptable", {"Content-Type", "text/plain"}, "Already publishing.");
        string err = StrPrinter << "ANNOUNCE:"
                                << "Already publishing:"
                                << _mediaInfo._vhost << " "
                                << _mediaInfo._app << " "
                                << _mediaInfo._streamid << endl;
		throw SockException(Err_shutdown,err);
	}

	_strSession = makeRandStr(12);
    _strSdp = parser.Content();
    _aTrackInfo = SdpAttr(_strSdp).getAvailableTrack();

	_pushSrc = std::make_shared<RtspToRtmpMediaSource>(_mediaInfo._vhost,_mediaInfo._app,_mediaInfo._streamid);
	_pushSrc->setListener(dynamic_pointer_cast<MediaSourceEvent>(shared_from_this()));
	_pushSrc->onGetSDP(_strSdp);
	sendRtspResponse("200 OK");
}

void RtspSession::handleReq_RECORD(const Parser &parser){
	if (_aTrackInfo.empty() || parser["Session"] != _strSession) {
		send_SessionNotFound();
        throw SockException(Err_shutdown,_aTrackInfo.empty() ? "can not find any availabe track when record" : "session not found when record");
	}
	auto onRes = [this](const string &err){
		bool authSuccess = err.empty();
		if(!authSuccess){
			sendRtspResponse("401 Unauthorized", {"Content-Type", "text/plain"}, err);
			shutdown(SockException(Err_shutdown,StrPrinter << "401 Unauthorized:" << err));
			return;
		}

		_StrPrinter rtp_info;
		for(auto &track : _aTrackInfo){
			if (track->_inited == false) {
				//还有track没有setup
                shutdown(SockException(Err_shutdown,"track not setuped"));
                return;
			}
			rtp_info << "url=" << _strContentBase << "/" << track->_control_surffix << ",";
		}

		rtp_info.pop_back();
		sendRtspResponse("200 OK", {"RTP-Info",rtp_info});
		SockUtil::setNoDelay(_sock->rawFD(),false);
		if(_rtpType == Rtsp::RTP_TCP){
			//如果是rtsp推流服务器，并且是TCP推流，那么加大TCP接收缓存，这样能提升接收性能
			_sock->setReadBuffer(std::make_shared<BufferRaw>(256 * 1024));
		}
		(*this) << SocketFlags(kSockFlags);
	};

	weak_ptr<RtspSession> weakSelf = dynamic_pointer_cast<RtspSession>(shared_from_this());
	Broadcast::AuthInvoker invoker = [weakSelf,onRes](const string &err){
		auto strongSelf = weakSelf.lock();
		if(!strongSelf){
			return;
		}
		strongSelf->async([weakSelf,onRes,err](){
			auto strongSelf = weakSelf.lock();
			if(!strongSelf){
				return;
			}
			onRes(err);
		});
	};

	//rtsp推流需要鉴权
	auto flag = NoticeCenter::Instance().emitEvent(Broadcast::kBroadcastMediaPublish,_mediaInfo,invoker,*this);
	if(!flag){
		//该事件无人监听,默认不鉴权
		onRes("");
	}
}

void RtspSession::handleReq_Describe(const Parser &parser) {
    weak_ptr<RtspSession> weakSelf = dynamic_pointer_cast<RtspSession>(shared_from_this());
    //该请求中的认证信息
    auto authorization = parser["Authorization"];
    onGetRealm invoker = [weakSelf,authorization](const string &realm){
        auto strongSelf = weakSelf.lock();
        if(!strongSelf){
            //本对象已经销毁
            return;
        }
        //切换到自己的线程然后执行
        strongSelf->async([weakSelf,realm,authorization](){
            auto strongSelf = weakSelf.lock();
            if(!strongSelf){
                //本对象已经销毁
                return;
            }
            if(realm.empty()){
                //无需认证,回复sdp
                strongSelf->onAuthSuccess();
                return;
            }
            //该流需要认证
            strongSelf->onAuthUser(realm,authorization);
        });

    };

    //广播是否需要认证事件
    if(!NoticeCenter::Instance().emitEvent(Broadcast::kBroadcastOnGetRtspRealm,
                                           _mediaInfo,
                                           invoker,
                                           *this)){
        //无人监听此事件，说明无需认证
        invoker("");
    }
}
void RtspSession::onAuthSuccess() {
    TraceP(this);
    weak_ptr<RtspSession> weakSelf = dynamic_pointer_cast<RtspSession>(shared_from_this());
    MediaSource::findAsync(_mediaInfo,weakSelf.lock(), true,[weakSelf](const MediaSource::Ptr &src){
        auto strongSelf = weakSelf.lock();
        if(!strongSelf){
            return;
        }
        auto rtsp_src = dynamic_pointer_cast<RtspMediaSource>(src);
        if (!rtsp_src) {
            //未找到相应的MediaSource
            string err = StrPrinter << "no such stream:" <<  strongSelf->_mediaInfo._vhost << " " <<  strongSelf->_mediaInfo._app << " " << strongSelf->_mediaInfo._streamid;
            strongSelf->send_StreamNotFound();
            strongSelf->shutdown(SockException(Err_shutdown,err));
            return;
        }
        //找到了响应的rtsp流
        strongSelf->_strSdp = rtsp_src->getSdp();
        SdpAttr sdpAttr(strongSelf->_strSdp);
        strongSelf->_aTrackInfo = sdpAttr.getAvailableTrack();
        if (strongSelf->_aTrackInfo.empty()) {
            //该流无效
            strongSelf->send_StreamNotFound();
            strongSelf->shutdown(SockException(Err_shutdown,"can not find any availabe track in sdp"));
            return;
        }
        strongSelf->_strSession = makeRandStr(12);
        strongSelf->_pMediaSrc = rtsp_src;
        for(auto &track : strongSelf->_aTrackInfo){
            track->_ssrc = rtsp_src->getSsrc(track->_type);
            track->_seq = rtsp_src->getSeqence(track->_type);
            track->_time_stamp = rtsp_src->getTimeStamp(track->_type);
        }

        strongSelf->sendRtspResponse("200 OK",
                                     {"Content-Base",strongSelf->_strContentBase + "/",
                                      "x-Accept-Retransmit","our-retransmit",
                                      "x-Accept-Dynamic-Rate","1"
                                     },strongSelf->_strSdp);
    });
}
void RtspSession::onAuthFailed(const string &realm,const string &why,bool close) {
    GET_CONFIG(bool,authBasic,Rtsp::kAuthBasic);
    if (!authBasic) {
        //我们需要客户端优先以md5方式认证
        _strNonce = makeRandStr(32);
        sendRtspResponse("401 Unauthorized",
                         {"WWW-Authenticate",
                          StrPrinter << "Digest realm=\"" << realm << "\",nonce=\"" << _strNonce << "\"" });
    }else {
        //当然我们也支持base64认证,但是我们不建议这样做
        sendRtspResponse("401 Unauthorized",
                         {"WWW-Authenticate",
                          StrPrinter << "Basic realm=\"" << realm << "\"" });
    }
    if(close){
        shutdown(SockException(Err_shutdown,StrPrinter << "401 Unauthorized:" << why));
    }
}

void RtspSession::onAuthBasic(const string &realm,const string &strBase64){
    //base64认证
    char user_pwd_buf[512];
    av_base64_decode((uint8_t *)user_pwd_buf,strBase64.data(),strBase64.size());
    auto user_pwd_vec = split(user_pwd_buf,":");
    if(user_pwd_vec.size() < 2){
        //认证信息格式不合法，回复401 Unauthorized
        onAuthFailed(realm,"can not find user and passwd when basic64 auth");
        return;
    }
    auto user = user_pwd_vec[0];
    auto pwd = user_pwd_vec[1];
    weak_ptr<RtspSession> weakSelf = dynamic_pointer_cast<RtspSession>(shared_from_this());
    onAuth invoker = [pwd,realm,weakSelf](bool encrypted,const string &good_pwd){
        auto strongSelf = weakSelf.lock();
        if(!strongSelf){
            //本对象已经销毁
            return;
        }
        //切换到自己的线程执行
        strongSelf->async([weakSelf,good_pwd,pwd,realm](){
            auto strongSelf = weakSelf.lock();
            if(!strongSelf){
                //本对象已经销毁
                return;
            }
            //base64忽略encrypted参数，上层必须传入明文密码
            if(pwd == good_pwd){
                //提供的密码且匹配正确
                strongSelf->onAuthSuccess();
                return;
            }
            //密码错误
            strongSelf->onAuthFailed(realm,StrPrinter << "password mismatch when base64 auth:" << pwd << " != " << good_pwd);
        });
    };

    //此时必须提供明文密码
    if(!NoticeCenter::Instance().emitEvent(Broadcast::kBroadcastOnRtspAuth,_mediaInfo,realm,user, true,invoker,*this)){
        //表明该流需要认证却没监听请求密码事件，这一般是大意的程序所为，警告之
        WarnP(this) << "请监听kBroadcastOnRtspAuth事件！";
        //但是我们还是忽略认证以便完成播放
        //我们输入的密码是明文
        invoker(false,pwd);
    }
}

void RtspSession::onAuthDigest(const string &realm,const string &strMd5){
	DebugP(this) << strMd5;
    auto mapTmp = Parser::parseArgs(strMd5,",","=");
    decltype(mapTmp) map;
    for(auto &pr : mapTmp){
        map[trim(string(pr.first)," \"")] = trim(pr.second," \"");
    }
    //check realm
    if(realm != map["realm"]){
        onAuthFailed(realm,StrPrinter << "realm not mached:" << realm << " != " << map["realm"]);
        return ;
    }
    //check nonce
    auto nonce = map["nonce"];
    if(_strNonce != nonce){
        onAuthFailed(realm,StrPrinter << "nonce not mached:" << nonce << " != " << _strNonce);
        return ;
    }
    //check username and uri
    auto username = map["username"];
    auto uri = map["uri"];
    auto response = map["response"];
    if(username.empty() || uri.empty() || response.empty()){
        onAuthFailed(realm,StrPrinter << "username/uri/response empty:" << username << "," << uri << "," << response);
        return ;
    }

    auto realInvoker = [this,realm,nonce,uri,username,response](bool ignoreAuth,bool encrypted,const string &good_pwd){
        if(ignoreAuth){
            //忽略认证
            TraceP(this) << "auth ignored";
            onAuthSuccess();
            return;
        }
        /*
        response计算方法如下：
        RTSP客户端应该使用username + password并计算response如下:
        (1)当password为MD5编码,则
            response = md5( password:nonce:md5(public_method:url)  );
        (2)当password为ANSI字符串,则
            response= md5( md5(username:realm:password):nonce:md5(public_method:url) );
         */
        auto encrypted_pwd = good_pwd;
        if(!encrypted){
            //提供的是明文密码
            encrypted_pwd = MD5(username+ ":" + realm + ":" + good_pwd).hexdigest();
        }

        auto good_response = MD5( encrypted_pwd + ":" + nonce + ":" + MD5(string("DESCRIBE") + ":" + uri).hexdigest()).hexdigest();
        if(strcasecmp(good_response.data(),response.data()) == 0){
            //认证成功！md5不区分大小写
            onAuthSuccess();
        }else{
            //认证失败！
            onAuthFailed(realm, StrPrinter << "password mismatch when md5 auth:" << good_response << " != " << response );
        }
    };

    weak_ptr<RtspSession> weakSelf = dynamic_pointer_cast<RtspSession>(shared_from_this());
    onAuth invoker = [realInvoker,weakSelf](bool encrypted,const string &good_pwd){
        auto strongSelf = weakSelf.lock();
        if(!strongSelf){
            return;
        }
        //切换到自己的线程确保realInvoker执行时，this指针有效
        strongSelf->async([realInvoker,weakSelf,encrypted,good_pwd](){
            auto strongSelf = weakSelf.lock();
            if(!strongSelf){
                return;
            }
            realInvoker(false,encrypted,good_pwd);
        });
    };

    //此时可以提供明文或md5加密的密码
    if(!NoticeCenter::Instance().emitEvent(Broadcast::kBroadcastOnRtspAuth,_mediaInfo,realm,username, false,invoker,*this)){
        //表明该流需要认证却没监听请求密码事件，这一般是大意的程序所为，警告之
        WarnP(this) << "请监听kBroadcastOnRtspAuth事件！";
        //但是我们还是忽略认证以便完成播放
        realInvoker(true,true,"");
    }
}

void RtspSession::onAuthUser(const string &realm,const string &authorization){
    if(authorization.empty()){
        onAuthFailed(realm,"", false);
        return;
    }
    //请求中包含认证信息
    auto authType = FindField(authorization.data(),NULL," ");
	auto authStr = FindField(authorization.data()," ",NULL);
    if(authType.empty() || authStr.empty()){
        //认证信息格式不合法，回复401 Unauthorized
        onAuthFailed(realm,"can not find auth type or auth string");
        return;
    }
    if(authType == "Basic"){
        //base64认证，需要明文密码
        onAuthBasic(realm,authStr);
    }else if(authType == "Digest"){
        //md5认证
        onAuthDigest(realm,authStr);
    }else{
        //其他认证方式？不支持！
        onAuthFailed(realm,StrPrinter << "unsupported auth type:" << authType);
    }
}
inline void RtspSession::send_StreamNotFound() {
	sendRtspResponse("404 Stream Not Found",{"Connection","Close"});
}
inline void RtspSession::send_UnsupportedTransport() {
	sendRtspResponse("461 Unsupported Transport",{"Connection","Close"});
}

inline void RtspSession::send_SessionNotFound() {
	sendRtspResponse("454 Session Not Found",{"Connection","Close"});
}

void RtspSession::handleReq_Setup(const Parser &parser) {
//处理setup命令，该函数可能进入多次
    auto controlSuffix = split(parser.Url(),"/").back();// parser.FullUrl().substr(_strContentBase.size());
    if(controlSuffix.front() == '/'){
		controlSuffix = controlSuffix.substr(1);
    }
	int trackIdx = getTrackIndexByControlSuffix(controlSuffix);
	if (trackIdx == -1) {
		//未找到相应track
        throw SockException(Err_shutdown, StrPrinter << "can not find any track by control suffix:" << controlSuffix);
    }
	SdpTrack::Ptr &trackRef = _aTrackInfo[trackIdx];
	if (trackRef->_inited) {
		//已经初始化过该Track
        throw SockException(Err_shutdown, "can not setup one track twice");
	}
	trackRef->_inited = true; //现在初始化
	trackRef->_interleaved = trackRef->_type * 2;

	if(_rtpType == Rtsp::RTP_Invalid){
		auto strTransport = parser["Transport"];
		if(strTransport.find("TCP") != string::npos){
			_rtpType = Rtsp::RTP_TCP;
		}else if(strTransport.find("multicast") != string::npos){
			_rtpType = Rtsp::RTP_MULTICAST;
		}else{
			_rtpType = Rtsp::RTP_UDP;
		}
	}

	//允许接收rtp、rtcp包
	RtspSplitter::enableRecvRtp(_rtpType == Rtsp::RTP_TCP);

	switch (_rtpType) {
	case Rtsp::RTP_TCP: {
		sendRtspResponse("200 OK",
						 {"Transport",StrPrinter << "RTP/AVP/TCP;unicast;"
												 << "interleaved=" << trackRef->_type * 2 << "-" << trackRef->_type * 2 + 1 << ";"
												 << "ssrc=" << printSSRC(trackRef->_ssrc),
						  "x-Transport-Options" , "late-tolerance=1.400000",
						  "x-Dynamic-Rate" , "1"
						 });
	}
		break;
	case Rtsp::RTP_UDP: {
		//我们用trackIdx区分rtp和rtcp包
		auto pSockRtp = std::make_shared<Socket>(_sock->getPoller());
		if (!pSockRtp->bindUdpSock(0,get_local_ip().data())) {
			//分配端口失败
			send_NotAcceptable();
            throw SockException(Err_shutdown, "open rtp socket failed");
        }
		auto pSockRtcp = std::make_shared<Socket>(_sock->getPoller());
		if (!pSockRtcp->bindUdpSock(pSockRtp->get_local_port() + 1,get_local_ip().data())) {
			//分配端口失败
			send_NotAcceptable();
            throw SockException(Err_shutdown, "open rtcp socket failed");
        }
		_apRtpSock[trackIdx] = pSockRtp;
		_apRtcpSock[trackIdx] = pSockRtcp;
		//设置客户端内网端口信息
		string strClientPort = FindField(parser["Transport"].data(), "client_port=", NULL);
		uint16_t ui16RtpPort = atoi( FindField(strClientPort.data(), NULL, "-").data());
        uint16_t ui16RtcpPort = atoi( FindField(strClientPort.data(), "-" , NULL).data());

        struct sockaddr_in peerAddr;
        //设置rtp发送目标地址
		peerAddr.sin_family = AF_INET;
		peerAddr.sin_port = htons(ui16RtpPort);
		peerAddr.sin_addr.s_addr = inet_addr(get_peer_ip().data());
		bzero(&(peerAddr.sin_zero), sizeof peerAddr.sin_zero);
		pSockRtp->setSendPeerAddr((struct sockaddr *)(&peerAddr));

		//设置rtcp发送目标地址
        peerAddr.sin_family = AF_INET;
        peerAddr.sin_port = htons(ui16RtcpPort);
        peerAddr.sin_addr.s_addr = inet_addr(get_peer_ip().data());
        bzero(&(peerAddr.sin_zero), sizeof peerAddr.sin_zero);
        pSockRtcp->setSendPeerAddr((struct sockaddr *)(&peerAddr));

		//尝试获取客户端nat映射地址
		startListenPeerUdpData(trackIdx);
		//InfoP(this) << "分配端口:" << srv_port;

		sendRtspResponse("200 OK",
						 {"Transport",StrPrinter << "RTP/AVP/UDP;unicast;"
												 << "client_port=" << strClientPort << ";"
												 << "server_port=" << pSockRtp->get_local_port() << "-" << pSockRtcp->get_local_port() << ";"
												 << "ssrc=" << printSSRC(trackRef->_ssrc)
						 });
	}
		break;
	case Rtsp::RTP_MULTICAST: {
		if(!_pBrdcaster){
			_pBrdcaster = RtpBroadCaster::get(getPoller(),get_local_ip(),_mediaInfo._vhost, _mediaInfo._app, _mediaInfo._streamid);
			if (!_pBrdcaster) {
				send_NotAcceptable();
                throw SockException(Err_shutdown, "can not get a available udp multicast socket");
            }
			weak_ptr<RtspSession> weakSelf = dynamic_pointer_cast<RtspSession>(shared_from_this());
			_pBrdcaster->setDetachCB(this, [weakSelf]() {
				auto strongSelf = weakSelf.lock();
				if(!strongSelf) {
					return;
				}
				strongSelf->safeShutdown(SockException(Err_shutdown,"ring buffer detached"));
			});
		}
		int iSrvPort = _pBrdcaster->getPort(trackRef->_type);
		//我们用trackIdx区分rtp和rtcp包
		//由于组播udp端口是共享的，而rtcp端口为组播udp端口+1，所以rtcp端口需要改成共享端口
		auto pSockRtcp = UDPServer::Instance().getSock(getPoller(),get_local_ip().data(),2*trackIdx + 1,iSrvPort + 1);
		if (!pSockRtcp) {
			//分配端口失败
			send_NotAcceptable();
            throw SockException(Err_shutdown, "open shared rtcp socket failed");
		}
		startListenPeerUdpData(trackIdx);
        GET_CONFIG(uint32_t,udpTTL,MultiCast::kUdpTTL);

		sendRtspResponse("200 OK",
						 {"Transport",StrPrinter << "RTP/AVP;multicast;"
												 << "destination=" << _pBrdcaster->getIP() << ";"
												 << "source=" << get_local_ip() << ";"
												 << "port=" << iSrvPort << "-" << pSockRtcp->get_local_port() << ";"
												 << "ttl=" << udpTTL << ";"
												 << "ssrc=" << printSSRC(trackRef->_ssrc)
						 });
	}
		break;
	default:
		break;
	}
}

void RtspSession::handleReq_Play(const Parser &parser) {
	if (_aTrackInfo.empty() || parser["Session"] != _strSession) {
		send_SessionNotFound();
        throw SockException(Err_shutdown,_aTrackInfo.empty() ? "can not find any availabe track when play" : "session not found when play");
    }
	auto strRange = parser["Range"];
    auto onRes = [this,strRange](const string &err){
        bool authSuccess = err.empty();
        if(!authSuccess){
            //第一次play是播放，否则是恢复播放。只对播放鉴权
			sendRtspResponse("401 Unauthorized", {"Content-Type", "text/plain"}, err);
            shutdown(SockException(Err_shutdown,StrPrinter << "401 Unauthorized:" << err));
            return;
        }

        auto pMediaSrc = _pMediaSrc.lock();
        if(!pMediaSrc){
        	send_StreamNotFound();
        	shutdown(SockException(Err_shutdown,"rtsp stream released"));
			return;
        }

        bool useBuf = true;
		_enableSendRtp = false;

		if (strRange.size() && !_bFirstPlay) {
            //这个是seek操作
			auto strStart = FindField(strRange.data(), "npt=", "-");
			if (strStart == "now") {
				strStart = "0";
			}
			auto iStartTime = 1000 * atof(strStart.data());
			InfoP(this) << "rtsp seekTo(ms):" << iStartTime;
			useBuf = !pMediaSrc->seekTo(iStartTime);
		}else if(pMediaSrc->readerCount() == 0){
			//第一个消费者
			pMediaSrc->seekTo(0);
		}
		_bFirstPlay = false;

		_StrPrinter rtp_info;
		for(auto &track : _aTrackInfo){
			if (track->_inited == false) {
				//还有track没有setup
                shutdown(SockException(Err_shutdown,"track not setuped"));
                return;
			}
			track->_ssrc = pMediaSrc->getSsrc(track->_type);
			track->_seq = pMediaSrc->getSeqence(track->_type);
			track->_time_stamp = pMediaSrc->getTimeStamp(track->_type);

			rtp_info << "url=" << _strContentBase << "/" << track->_control_surffix << ";"
					 << "seq=" << track->_seq << ";"
					 << "rtptime=" << (int)(track->_time_stamp * (track->_samplerate / 1000)) << ",";
		}

		rtp_info.pop_back();

		sendRtspResponse("200 OK",
						 {"Range", StrPrinter << "npt=" << setiosflags(ios::fixed) << setprecision(2) <<  pMediaSrc->getTimeStamp(TrackInvalid) / 1000.0,
						  "RTP-Info",rtp_info
						 });

		_enableSendRtp = true;

		//提高发送性能
		SockUtil::setNoDelay(_sock->rawFD(),false);
		(*this) << SocketFlags(kSockFlags);

		if (!_pRtpReader && _rtpType != Rtsp::RTP_MULTICAST) {
			weak_ptr<RtspSession> weakSelf = dynamic_pointer_cast<RtspSession>(shared_from_this());
			_pRtpReader = pMediaSrc->getRing()->attach(getPoller(),useBuf);
			_pRtpReader->setDetachCB([weakSelf]() {
				auto strongSelf = weakSelf.lock();
				if(!strongSelf) {
					return;
				}
                strongSelf->shutdown(SockException(Err_shutdown,"rtsp ring buffer detached"));
            });
			_pRtpReader->setReadCB([weakSelf](const RtpPacket::Ptr &pack) {
				auto strongSelf = weakSelf.lock();
				if(!strongSelf) {
					return;
				}
				if(strongSelf->_enableSendRtp) {
					strongSelf->sendRtpPacket(pack);
				}
			});
		}
    };

    weak_ptr<RtspSession> weakSelf = dynamic_pointer_cast<RtspSession>(shared_from_this());
    Broadcast::AuthInvoker invoker = [weakSelf,onRes](const string &err){
        auto strongSelf = weakSelf.lock();
        if(!strongSelf){
            return;
        }
        strongSelf->async([weakSelf,onRes,err](){
            auto strongSelf = weakSelf.lock();
            if(!strongSelf){
                return;
            }
            onRes(err);
        });
    };
    if(_bFirstPlay){
        //第一次收到play命令，需要鉴权
        auto flag = NoticeCenter::Instance().emitEvent(Broadcast::kBroadcastMediaPlayed,_mediaInfo,invoker,*this);
        if(!flag){
            //该事件无人监听,默认不鉴权
            onRes("");
        }
    }else{
        //后面是seek或恢复命令，不需要鉴权
        onRes("");
    }
}

void RtspSession::handleReq_Pause(const Parser &parser) {
	if (parser["Session"] != _strSession) {
		send_SessionNotFound();
        throw SockException(Err_shutdown,"session not found when pause");
    }

	sendRtspResponse("200 OK");
	_enableSendRtp = false;
}

void RtspSession::handleReq_Teardown(const Parser &parser) {
	sendRtspResponse("200 OK");
    throw SockException(Err_shutdown,"rtsp player send teardown request");
}

void RtspSession::handleReq_Get(const Parser &parser) {
	_http_x_sessioncookie = parser["x-sessioncookie"];
	sendRtspResponse("200 OK",
					 {"Cache-Control","no-store",
					  "Pragma","no-store",
					  "Content-Type","application/x-rtsp-tunnelled",
					 },"","HTTP/1.0");

	//注册http getter，以便http poster绑定
	lock_guard<recursive_mutex> lock(g_mtxGetter);
	g_mapGetter[_http_x_sessioncookie] = dynamic_pointer_cast<RtspSession>(shared_from_this());
}

void RtspSession::handleReq_Post(const Parser &parser) {
	lock_guard<recursive_mutex> lock(g_mtxGetter);
	string sessioncookie = parser["x-sessioncookie"];
	//Poster 找到 Getter
	auto it = g_mapGetter.find(sessioncookie);
	if (it == g_mapGetter.end()) {
        throw SockException(Err_shutdown,"can not find http getter by x-sessioncookie");
    }

	//Poster 找到Getter的SOCK
	auto httpGetterWeak = it->second;
	//移除http getter的弱引用记录
	g_mapGetter.erase(sessioncookie);

	//http poster收到请求后转发给http getter处理
	_onRecv = [this,httpGetterWeak](const Buffer::Ptr &pBuf){
		auto httpGetterStrong = httpGetterWeak.lock();
		if(!httpGetterStrong){
			shutdown(SockException(Err_shutdown,"http getter released"));
			return;
		}

		//切换到http getter的线程
		httpGetterStrong->async([pBuf,httpGetterWeak](){
			auto httpGetterStrong = httpGetterWeak.lock();
			if(!httpGetterStrong){
				return;
			}
			httpGetterStrong->onRecv(std::make_shared<BufferString>(decodeBase64(string(pBuf->data(),pBuf->size()))));
		});
	};

	if(!parser.Content().empty()){
		//http poster后面的粘包
		_onRecv(std::make_shared<BufferString>(parser.Content()));
	}

    sendRtspResponse("200 OK",
                     {"Cache-Control","no-store",
                      "Pragma","no-store",
                      "Content-Type","application/x-rtsp-tunnelled",
                     },"","HTTP/1.0");
}

void RtspSession::handleReq_SET_PARAMETER(const Parser &parser) {
	//TraceP(this) <<endl;
	sendRtspResponse("200 OK");
}

inline void RtspSession::send_NotAcceptable() {
	sendRtspResponse("406 Not Acceptable",{"Connection","Close"});
}


void RtspSession::onRtpSorted(const RtpPacket::Ptr &rtppt, int trackidx) {
	_pushSrc->onWrite(rtppt, false);
}
inline void RtspSession::onRcvPeerUdpData(int intervaled, const Buffer::Ptr &pBuf, const struct sockaddr& addr) {
	//这是rtcp心跳包，说明播放器还存活
	_ticker.resetTime();

	if(intervaled % 2 == 0){
		if(_pushSrc){
			handleOneRtp(intervaled / 2,_aTrackInfo[intervaled / 2],( unsigned char *)pBuf->data(),pBuf->size());
		}else if(_udpSockConnected.count(intervaled)){
            //这是rtp打洞包
            _udpSockConnected.emplace(intervaled);
            _apRtpSock[intervaled / 2]->setSendPeerAddr(&addr);
		}
	}else{
	    //rtcp包
        if(_udpSockConnected.count(intervaled)){
            _apRtcpSock[(intervaled - 1) / 2]->setSendPeerAddr(&addr);
        }
        onRtcpPacket((intervaled - 1) / 2, _aTrackInfo[(intervaled - 1) / 2], (unsigned char *) pBuf->data(),
                     pBuf->size());
    }
}


inline void RtspSession::startListenPeerUdpData(int trackIdx) {
	weak_ptr<RtspSession> weakSelf = dynamic_pointer_cast<RtspSession>(shared_from_this());
    auto srcIP = inet_addr(get_peer_ip().data());
	auto onUdpData = [weakSelf,srcIP](const Buffer::Ptr &pBuf, struct sockaddr *pPeerAddr,int intervaled){
		auto strongSelf=weakSelf.lock();
		if(!strongSelf) {
			return false;
		}

        if (((struct sockaddr_in *) pPeerAddr)->sin_addr.s_addr != srcIP) {
            WarnP(strongSelf.get()) << ((intervaled % 2 == 0) ? "收到其他地址的rtp数据:" : "收到其他地址的rtcp数据:")
                                    << inet_ntoa(((struct sockaddr_in *) pPeerAddr)->sin_addr);
            return true;
        }

		struct sockaddr addr=*pPeerAddr;
		strongSelf->async([weakSelf,pBuf,addr,intervaled]() {
			auto strongSelf=weakSelf.lock();
			if(!strongSelf) {
				return;
			}
			strongSelf->onRcvPeerUdpData(intervaled,pBuf,addr);
		});
		return true;
	};

	switch (_rtpType){
		case Rtsp::RTP_MULTICAST:{
			//组播使用的共享rtcp端口
			UDPServer::Instance().listenPeer(get_peer_ip().data(), this, [onUdpData](
					int intervaled, const Buffer::Ptr &pBuf, struct sockaddr *pPeerAddr) {
				return onUdpData(pBuf,pPeerAddr,intervaled);
			});
		}
			break;
		case Rtsp::RTP_UDP:{
			auto setEvent = [&](Socket::Ptr &sock,int intervaled){
				if(!sock){
					WarnP(this) << "udp端口为空:" << intervaled;
					return;
				}
				sock->setOnRead([onUdpData,intervaled](const Buffer::Ptr &pBuf, struct sockaddr *pPeerAddr , int addr_len){
					onUdpData(pBuf,pPeerAddr,intervaled);
				});
			};
			setEvent(_apRtpSock[trackIdx], 2*trackIdx );
			setEvent(_apRtcpSock[trackIdx], 2*trackIdx + 1 );
		}
			break;

		default:
			break;
	}

}

static string dateStr(){
	char buf[64];
	time_t tt = time(NULL);
	strftime(buf, sizeof buf, "%a, %b %d %Y %H:%M:%S GMT", gmtime(&tt));
	return buf;
}

bool RtspSession::sendRtspResponse(const string &res_code,
								   const StrCaseMap &header_const,
								   const string &sdp,
								   const char *protocol){
	auto header = header_const;
	header.emplace("CSeq",StrPrinter << _iCseq);
	if(!_strSession.empty()){
		header.emplace("Session",_strSession);
	}

	header.emplace("Server",SERVER_NAME "(build in " __DATE__ " " __TIME__ ")");
	header.emplace("Date",dateStr());

	if(!sdp.empty()){
		header.emplace("Content-Length",StrPrinter << sdp.size());
		header.emplace("Content-Type","application/sdp");
	}

	_StrPrinter printer;
	printer << protocol << " " << res_code << "\r\n";
	for (auto &pr : header){
		printer << pr.first << ": " << pr.second << "\r\n";
	}

	printer << "\r\n";

	if(!sdp.empty()){
		printer << sdp;
	}
//	DebugP(this) << printer;
	return send(std::make_shared<BufferString>(printer)) > 0 ;
}

int RtspSession::send(const Buffer::Ptr &pkt){
//	if(!_enableSendRtp){
//		DebugP(this) << pkt->data();
//	}
	_ui64TotalBytes += pkt->size();
	return TcpSession::send(pkt);
}

bool RtspSession::sendRtspResponse(const string &res_code,
								   const std::initializer_list<string> &header,
								   const string &sdp,
								   const char *protocol) {
	string key;
	StrCaseMap header_map;
	int i = 0;
	for(auto &val : header){
		if(++i % 2 == 0){
			header_map.emplace(key,val);
		}else{
			key = val;
		}
	}
	return sendRtspResponse(res_code,header_map,sdp,protocol);
}

inline string RtspSession::printSSRC(uint32_t ui32Ssrc) {
	char tmp[9] = { 0 };
	ui32Ssrc = htonl(ui32Ssrc);
	uint8_t *pSsrc = (uint8_t *) &ui32Ssrc;
	for (int i = 0; i < 4; i++) {
		sprintf(tmp + 2 * i, "%02X", pSsrc[i]);
	}
	return tmp;
}
inline int RtspSession::getTrackIndexByTrackType(TrackType type) {
	for (unsigned int i = 0; i < _aTrackInfo.size(); i++) {
		if (type == _aTrackInfo[i]->_type) {
			return i;
		}
	}
	return -1;
}
inline int RtspSession::getTrackIndexByControlSuffix(const string &controlSuffix) {
	for (unsigned int i = 0; i < _aTrackInfo.size(); i++) {
		if (controlSuffix == _aTrackInfo[i]->_control_surffix) {
			return i;
		}
	}
	if(_aTrackInfo.size() == 1){
        return 0;
	}
	return -1;
}

inline int RtspSession::getTrackIndexByInterleaved(int interleaved){
	for (unsigned int i = 0; i < _aTrackInfo.size(); i++) {
		if (_aTrackInfo[i]->_interleaved == interleaved) {
			return i;
		}
	}
	return -1;
}

bool RtspSession::close(MediaSource &sender,bool force) {
    //此回调在其他线程触发
    if(!_pushSrc || (!force && _pushSrc->readerCount() != 0)){
        return false;
    }
	string err = StrPrinter << "close media:" << sender.getSchema() << "/" << sender.getVhost() << "/" << sender.getApp() << "/" << sender.getId() << " " << force;
	safeShutdown(SockException(Err_shutdown,err));
	return true;
}


void RtspSession::onNoneReader(MediaSource &sender){
    //此回调在其他线程触发
    if(!_pushSrc || _pushSrc->readerCount() != 0){
        return;
    }
    MediaSourceEvent::onNoneReader(sender);
}


void RtspSession::sendRtpPacket(const RtpPacket::Ptr & pkt) {
    //InfoP(this) <<(int)pkt.Interleaved;
    switch (_rtpType) {
        case Rtsp::RTP_TCP: {
            send(pkt);
        }
            break;
        case Rtsp::RTP_UDP: {
            int iTrackIndex = getTrackIndexByTrackType(pkt->type);
            auto &pSock = _apRtpSock[iTrackIndex];
            if (!pSock) {
                shutdown(SockException(Err_shutdown,"udp sock not opened yet"));
                return;
            }
            BufferRtp::Ptr buffer(new BufferRtp(pkt,4));
            _ui64TotalBytes += buffer->size();
            pSock->send(buffer);
        }
            break;
        default:
            break;
    }

#if RTSP_SERVER_SEND_RTCP
    int iTrackIndex = getTrackIndexByInterleaved(pkt->interleaved);
    if(iTrackIndex == -1){
        return;
    }
    RtcpCounter &counter = _aRtcpCnt[iTrackIndex];
    counter.pktCnt += 1;
    counter.octCount += (pkt->length - pkt->offset);
    auto &ticker = _aRtcpTicker[iTrackIndex];
    if (ticker.elapsedTime() > 5 * 1000) {
        //send rtcp every 5 second
        ticker.resetTime();
        //直接保存网络字节序
        memcpy(&counter.timeStamp, pkt->payload + 8 , 4);
        sendSenderReport(_rtpType == Rtsp::RTP_TCP,iTrackIndex);
    }
#endif
}

void RtspSession::sendSenderReport(bool overTcp,int iTrackIndex) {
    static const char s_cname[] = "ZLMediaKitRtsp";
    uint8_t aui8Rtcp[4 + 28 + 10 + sizeof(s_cname) + 1] = {0};
    uint8_t *pui8Rtcp_SR = aui8Rtcp + 4, *pui8Rtcp_SDES = pui8Rtcp_SR + 28;
    auto &track = _aTrackInfo[iTrackIndex];
    auto &counter = _aRtcpCnt[iTrackIndex];

    aui8Rtcp[0] = '$';
    aui8Rtcp[1] = track->_interleaved + 1;
    aui8Rtcp[2] = (sizeof(aui8Rtcp) - 4) >> 8;
    aui8Rtcp[3] = (sizeof(aui8Rtcp) - 4) & 0xFF;

    pui8Rtcp_SR[0] = 0x80;
    pui8Rtcp_SR[1] = 0xC8;
    pui8Rtcp_SR[2] = 0x00;
    pui8Rtcp_SR[3] = 0x06;

    uint32_t ssrc=htonl(track->_ssrc);
    memcpy(&pui8Rtcp_SR[4], &ssrc, 4);

    uint64_t msw;
    uint64_t lsw;
    struct timeval tv;
    gettimeofday(&tv, NULL);
    msw = tv.tv_sec + 0x83AA7E80; /* 0x83AA7E80 is the number of seconds from 1900 to 1970 */
    lsw = (uint32_t) ((double) tv.tv_usec * (double) (((uint64_t) 1) << 32) * 1.0e-6);

    msw = htonl(msw);
    memcpy(&pui8Rtcp_SR[8], &msw, 4);

    lsw = htonl(lsw);
    memcpy(&pui8Rtcp_SR[12], &lsw, 4);
    //直接使用网络字节序
    memcpy(&pui8Rtcp_SR[16], &counter.timeStamp, 4);

    uint32_t pktCnt = htonl(counter.pktCnt);
    memcpy(&pui8Rtcp_SR[20], &pktCnt, 4);

    uint32_t octCount = htonl(counter.octCount);
    memcpy(&pui8Rtcp_SR[24], &octCount, 4);

    pui8Rtcp_SDES[0] = 0x81;
    pui8Rtcp_SDES[1] = 0xCA;
    pui8Rtcp_SDES[2] = 0x00;
    pui8Rtcp_SDES[3] = 0x06;

    memcpy(&pui8Rtcp_SDES[4], &ssrc, 4);

    pui8Rtcp_SDES[8] = 0x01;
    pui8Rtcp_SDES[9] = 0x0f;
    memcpy(&pui8Rtcp_SDES[10], s_cname, sizeof(s_cname));
    pui8Rtcp_SDES[10 + sizeof(s_cname)] = 0x00;

    if(overTcp){
        send(obtainBuffer((char *) aui8Rtcp, sizeof(aui8Rtcp)));
    }else {
        _apRtcpSock[iTrackIndex]->send((char *) aui8Rtcp + 4, sizeof(aui8Rtcp) - 4);
    }
}

}
/* namespace mediakit */