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tcserver.cpp
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tcserver.cpp
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// Copyright © 2022 Michael Thornburgh
// SPDX-License-Identifier: MIT
// TC Server, a simple live media server for RTMFP/RTMP “Tin-Can” clients.
// See the help message and tcserver.md for more information.
// TODO: rate limits
// TODO: support http://zenomt.com/ns/rtmfp#media (rtmfp, rtws)
#include <cassert>
#include <cerrno>
#include <csignal>
#include <cstdint>
#include <cstdio>
#include <cstdlib>
#include <cstring>
extern "C" {
#include <fcntl.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <unistd.h>
#include <math.h>
#include <netinet/tcp.h>
#include <time.h>
}
#include "rtmfp/rtmfp.hpp"
#include "rtmfp/RunLoops.hpp"
#include "rtmfp/FlashCryptoAdapter_OpenSSL.hpp"
#include "rtmfp/PerformerPosixPlatformAdapter.hpp"
#include "rtmfp/TCMessage.hpp"
#include "rtmfp/FlowSyncManager.hpp"
#include "rtmfp/ReorderBuffer.hpp"
#include "rtmfp/RedirectorClient.hpp"
#include "rtmfp/Hex.hpp"
#include "rtmfp/URIParse.hpp"
#include "RTMP.hpp"
#include "PosixStreamPlatformAdapter.hpp"
#include "redirectorspec.hpp"
#include "RTWebSocket.hpp"
#include "SimpleWebSocket.hpp"
#include "SimpleWebSocketMessagePlatformAdapter.hpp"
using namespace com::zenomt;
using namespace com::zenomt::rtmfp;
using namespace com::zenomt::rtmp;
using namespace com::zenomt::websock;
using Args = std::vector<std::shared_ptr<AMF0>>;
using LogAttributes = std::vector<std::pair<const char *, std::shared_ptr<AMF0>>>;
namespace {
enum Protocol { PROTO_UNSPEC, PROTO_RTMP, PROTO_RTMP_SIMPLE, PROTO_RTWS, PROTO_RTMFP };
enum {
TC_VIDEO_COMMAND_RANDOM_ACCESS_CHECKPOINT = 3
};
int verbose = 0;
bool requireHMAC = true;
bool requireSSEQ = true;
Time videoLifetime = 2.0;
Time audioLifetime = 2.2;
Time finishByMargin = 0.1;
Time previousGopStartByMargin = 0.1;
Time checkpointLifetime = 4.5;
Time reorderWindowPeriod = 1.0;
Time delaycc_delay = INFINITY;
Time shutdownTimeout = 10.0;
Time gracefulShutdownTimeout = 300.0;
bool expirePreviousGop = true;
bool allowMultipleConnections = false;
bool interrupted = false;
bool stopping = false;
bool showStats = false;
bool unregister = false;
bool shuttingDown = false;
bool allowConnectDuringShutdown = false;
int dscp = 0;
size_t maxNetStreamsPerClient = 1024; // arbitrary
uint32_t timestampAdjustmentMargin = 4000;
std::vector<Bytes> secrets;
const char *serverInfo = nullptr;
std::vector<std::shared_ptr<RedirectorClient>> redirectors;
pid_t pid;
std::string serverId;
Time streamAccountingMin = 1.0;
Time streamAccountingMax = 2.0;
PreferredRunLoop mainRL;
Performer mainPerformer(&mainRL);
PreferredRunLoop workerRL;
Performer workerPerformer(&workerRL);
FlashCryptoAdapter *flashcrypto = nullptr; // set in main()
class Client;
std::map<Bytes, std::shared_ptr<Client>> clients;
size_t currentPublishCount = 0;
size_t currentSubscribeCount = 0;
size_t rtmfpAcceptCount = 0;
size_t rtmpAcceptCount = 0;
size_t rtwsAcceptCount = 0;
size_t connectCount = 0;
size_t publishCount = 0;
size_t subscribeCount = 0;
size_t broadcastCount = 0;
size_t relaysIn = 0;
size_t relaysOut = 0;
size_t lookupCount = 0;
size_t introCount = 0;
Time publishedDuration = 0.0;
Time playedDuration = 0.0;
std::string protocolDescription(Protocol protocol)
{
switch(protocol)
{
case PROTO_RTMP: return "rtmp";
case PROTO_RTMP_SIMPLE: return "rtmp-simple";
case PROTO_RTWS: return "rtws";
case PROTO_RTMFP: return "rtmfp";
default: return "unspecified";
}
}
std::string redirectorStatusDescription(RedirectorClient::Status status)
{
switch(status)
{
case RedirectorClient::STATUS_IDLE: return "idle";
case RedirectorClient::STATUS_CONNECTING: return "connecting";
case RedirectorClient::STATUS_CONNECTED: return "connected";
case RedirectorClient::STATUS_DISCONNECTED: return "disconnected";
case RedirectorClient::STATUS_DISCONNECTED_BAD_AUTH: return "disconnected-bad-auth";
case RedirectorClient::STATUS_CLOSED: return "closed";
default: return "unknown-status";
}
}
std::string hexHMACSHA256(const Bytes &key, const std::string &app)
{
uint8_t md[32] = { 0 };
flashcrypto->hmacSHA256(md, key.data(), key.size(), app.data(), app.size());
return Hex::encode(md, sizeof(md));
}
std::map<std::string, std::string> splitParams(const std::string &str, const std::string &seps)
{
std::map<std::string, std::string> rv;
auto params = URIParse::split(str, seps);
for(auto it = params.begin(); it != params.end(); it++)
{
auto parts = URIParse::split(*it, "=", 2);
rv[parts[0]] = parts.size() > 1 ? parts[1] : "";
}
return rv;
}
long double paramValueToFloat(const std::string &str, long double defaultValue)
{
if(str.empty())
return defaultValue;
const char *valueStr = str.c_str();
char *endptr = nullptr;
long double rv = strtold(valueStr, &endptr);
return ((endptr == valueStr) or std::isnan(rv)) ? defaultValue : rv;
}
Time unixCurrentTime()
{
// note: C++20 guarantees that std::chrono::system_clock measures
// Unix time, but we're C++11 right now, which doesn't.
struct timespec tp;
if(::clock_gettime(CLOCK_REALTIME, &tp))
return -1.0;
return Time(tp.tv_sec) + Time(tp.tv_nsec) / Time(1000000000.0);
}
void jsonLog(const std::string &type, const LogAttributes &attrlist)
{
auto attrs = AMF0::Object();
for(auto it = attrlist.begin(); it != attrlist.end(); it++)
attrs->putValueAtKey(it->second, it->first);
attrs
->putValueAtKey(AMF0::Number(pid), "@pid")
->putValueAtKey(AMF0::String(serverId), "@server")
->putValueAtKey(AMF0::Number(unixCurrentTime()), "@timestamp")
->putValueAtKey(AMF0::String(type), "@type")
;
printf("%s\n", attrs->toJSON(0).c_str());
}
struct NetStream : public Object {
enum State { NS_IDLE, NS_PUBLISHING, NS_PLAYING };
NetStream() = delete;
NetStream(std::shared_ptr<Client> owner, uint32_t streamID) : m_owner(owner), m_streamID(streamID)
{
resetPlayParams();
}
void resetPlayParams()
{
m_audioLifetime = audioLifetime;
m_videoLifetime = videoLifetime;
m_finishByMargin = finishByMargin;
m_expirePreviousGop = expirePreviousGop;
m_previousGopStartByMargin = previousGopStartByMargin;
m_seenKeyframe = false;
}
static void trySetTimeParam(Time *dst, const std::map<std::string, std::string> ¶ms, const std::string &key, Time defaultSetting)
{
auto it = params.find(key);
if(it != params.end())
{
Time timeValue = paramValueToFloat(it->second, -1);
if(timeValue >= 0.0)
{
Time max = std::max(Time(10.0), defaultSetting * 2); // safety to avoid buffering too much
*dst = std::min(timeValue, max);
if(verbose) printf("set play param %s to %f\n", key.c_str(), (double)*dst);
}
}
}
void overridePlayParams(const std::string &queryStr)
{
auto params = splitParams(queryStr, "&?;");
trySetTimeParam(&m_audioLifetime, params, "audioLifetime", audioLifetime);
trySetTimeParam(&m_videoLifetime, params, "videoLifetime", videoLifetime);
trySetTimeParam(&m_finishByMargin, params, "finishByMargin", finishByMargin);
trySetTimeParam(&m_previousGopStartByMargin, params, "previousGopStartByMargin", previousGopStartByMargin);
if(params.count("expirePreviousGop"))
{
auto v = params["expirePreviousGop"];
m_expirePreviousGop = not ((v == "0") or (v == "no") or (v == "false"));
if(verbose) printf("set expirePreviousGop to %s\n", m_expirePreviousGop ? "yes" : "no");
}
if(params.count("asis"))
{
auto v = params["asis"];
m_adjustTimestamps = ((v == "0") or (v == "no") or (v == "false"));
if(verbose) printf("set asis to %s\n", m_adjustTimestamps ? "no" : "yes");
}
else
m_adjustTimestamps = true;
if(not m_adjustTimestamps)
m_timestampOffset = m_highestTimestamp = m_minTimestamp = 0;
}
Time updateTimeAccounting(bool wrappingUp)
{
Time now = mainRL.getCurrentTime();
Time delta = now - m_lastStreamAcctTime;
if((delta >= streamAccountingMin) or wrappingUp)
{
m_lastStreamAcctTime = wrappingUp ? -INFINITY : now;
if(delta < streamAccountingMax)
{
m_streamDuration += delta;
return delta;
}
}
return 0.0;
}
void resetTimeAccounting()
{
m_streamDuration = 0.0;
m_lastStreamAcctTime = -INFINITY;
}
void expireChain()
{
m_chain.expire(
m_expirePreviousGop ? mainRL.getCurrentTime() + m_previousGopStartByMargin : INFINITY,
m_expirePreviousGop ? mainRL.getCurrentTime() + m_finishByMargin : INFINITY);
}
std::shared_ptr<Client> m_owner;
State m_state { NS_IDLE };
uint32_t m_streamID;
std::string m_name;
std::string m_hashname;
std::string m_query;
uint32_t m_timestampOffset { 0 };
uint32_t m_highestTimestamp { 0 };
uint32_t m_minTimestamp { 0 };
bool m_restarted { false };
bool m_seenKeyframe { false };
bool m_adjustTimestamps { true };
bool m_paused { false };
bool m_receiveVideo { true };
bool m_receiveAudio { true };
Time m_audioLifetime;
Time m_videoLifetime;
Time m_finishByMargin;
Time m_previousGopStartByMargin;
Time m_streamDuration { 0.0 };
Time m_lastStreamAcctTime { -INFINITY };
bool m_expirePreviousGop;
WriteReceiptChain m_chain;
};
struct Stream {
bool m_publishing { false };
std::shared_ptr<NetStream> m_publisher;
std::set<std::shared_ptr<NetStream>> m_subscribers;
std::map<std::string, Bytes> m_dataFrames; // Bytes includes callback name
Bytes m_videoInit;
Bytes m_audioInit;
Bytes m_lastVideoKeyframe;
Bytes m_videoMetadataBeforeInit; // Enhanced RTMP https://github.com/veovera/enhanced-rtmp
Bytes m_videoMetadataLatest; // Enhanced RTMP
Bytes m_audioMultichannelConfigBeforeInit; // Enhanced RTMP
Bytes m_audioMultichannelConfigLatest; // Enhanced RTMP
uint32_t m_lastVideoTimestamp { 0 };
uint32_t m_lastVideoCodec { UINT32_C(0xffffffff) };
uint32_t m_lastAudioCodec { UINT32_C(0xffffffff) };
double m_priority { 0 };
bool m_lastVideoFrameWasKey { false };
void unpublishClear()
{
m_publishing = false;
m_publisher.reset();
m_dataFrames.clear();
m_videoInit.clear();
m_audioInit.clear();
m_lastVideoKeyframe.clear();
m_videoMetadataBeforeInit.clear();
m_videoMetadataLatest.clear();
m_audioMultichannelConfigBeforeInit.clear();
m_audioMultichannelConfigLatest.clear();
m_lastVideoTimestamp = 0;
m_lastVideoCodec = UINT32_C(0xffffffff);
m_lastAudioCodec = UINT32_C(0xffffffff);
m_lastVideoFrameWasKey = false;
}
};
class App : public Object {
public:
App(const std::string &name) : m_name(name)
{
jsonLog("create-app", {{"app", AMF0::String(m_name)}});
}
~App()
{
jsonLog("destroy-app", {
{"app", AMF0::String(m_name)},
{"connects", AMF0::Number(m_connectCount)},
{"maxClients", AMF0::Number(m_maxClients)},
{"publishes", AMF0::Number(m_publishCount)},
{"plays", AMF0::Number(m_subscribeCount)},
{"relaysIn", AMF0::Number(m_relaysIn)},
{"relaysOut", AMF0::Number(m_relaysOut)},
{"broadcasts", AMF0::Number(m_broadcastCount)},
{"playedDuration", AMF0::Number(::round(m_playedDuration))},
{"publishedDuration", AMF0::Number(::round(m_publishedDuration))}
});
}
static bool isHashName(const std::string &name)
{
return 0 == name.compare(0, 7, "sha256:");
}
static std::string asHashName(const std::string &name)
{
if(isHashName(name))
return name;
uint8_t md[32];
flashcrypto->sha256(md, name.data(), name.size());
return std::string("sha256:") + Hex::encode(md, sizeof(md));
}
// implementations below in "--- App" section
static std::shared_ptr<App> getApp(const std::string &name);
void addClient(std::shared_ptr<Client> client, const std::string &username, bool isExclusive);
void removeClient(std::shared_ptr<Client> client, const std::string &username);
void broadcastMessage(Client *sender, const Bytes &message);
void sendShutdownNotify();
void subscribeStream(const std::string &hashname, std::shared_ptr<NetStream> netStream);
void unsubscribeStream(const std::string &hashname, std::shared_ptr<NetStream> netStream);
bool publishStream(const std::string &hashname, std::shared_ptr<NetStream> netStream, double publishPriority); // false means stream was already being published and wasn't preempted
void unpublishStream(const std::string &hashname);
void releaseStream(const std::string &hashname, double publishPriority);
void onStreamMessage(const std::string &hashname, uint8_t messageType, uint32_t timestamp, const uint8_t *payload, size_t len);
static bool isVideoCheckpointCommand(const uint8_t *payload, size_t len);
static bool isVideoSequenceSpecial(const uint8_t *payload, size_t len);
size_t m_relaysIn { 0 };
size_t m_relaysOut { 0 };
Time m_publishedDuration { 0.0 };
Time m_playedDuration { 0.0 };
protected:
void cleanupStream(const std::string &hashname);
size_t m_connectCount { 0 };
size_t m_publishCount { 0 };
size_t m_subscribeCount { 0 };
size_t m_broadcastCount { 0 };
size_t m_maxClients { 0 };
std::set<std::shared_ptr<Client>> m_clients;
std::string m_name;
std::map<std::string, Stream> m_streams; // by hashname
std::map<std::string, std::shared_ptr<Client>> m_exclusiveClients; // by username
};
std::map<std::string, std::shared_ptr<App>> apps;
class Client : public Object {
public:
static void updateRedirectorLoadFactor()
{
for(auto it = redirectors.begin(); it != redirectors.end(); it++)
(*it)->setLoadFactor(clients.size());
}
static void onUnmatchedIHello(RTMFP *rtmfp, const void *epd, size_t epdLen, const void *tag, size_t tagLen, int interfaceID, const struct sockaddr *srcAddr)
{
FlashCryptoAdapter::EPDParseState epdParsed;
if(not epdParsed.parse((const uint8_t *)epd, epdLen))
return;
if(not epdParsed.fingerprint)
return;
Address addr(srcAddr);
addr.setOrigin(Address::ORIGIN_OBSERVED);
if(verbose) jsonLog("lookup", {
{"address", AMF0::String(addr.toPresentation())},
{"target", AMF0::String(Hex::encode(epdParsed.fingerprint, epdParsed.fingerprintLen))}
});
lookupCount++;
auto it = clients.find(Bytes(epdParsed.fingerprint, epdParsed.fingerprint + epdParsed.fingerprintLen));
if(it != clients.end())
it->second->doRedirect(rtmfp, epd, epdLen, tag, tagLen, interfaceID, addr);
}
virtual void doRedirect(RTMFP *rtmfp, const void *epd, size_t epdLen, const void *tag, size_t tagLen, int interfaceID, const Address &addr)
{
}
virtual void close()
{
clientLog("closing", {});
m_open = false;
if(m_disconnectTimer)
m_disconnectTimer->cancel();
m_disconnectTimer.reset();
for(auto it = m_netStreams.begin(); it != m_netStreams.end(); it++)
closeStream(it->second);
m_netStreams.clear();
auto myself = share_ref(this);
for(auto it = m_watchedBy.begin(); it != m_watchedBy.end(); it++)
(*it)->onWatchedClientDidClose(myself);
m_watchedBy.clear();
for(auto it = m_watching.begin(); it != m_watching.end(); it++)
(*it)->onWatchingClientDidClose(myself);
m_watching.clear();
if(m_app)
m_app->removeClient(myself, m_username);
m_app.reset();
// log after tearing everything down to catch all accounting
clientLog("close", {
{"publishes", AMF0::Number(m_publishes)},
{"plays", AMF0::Number(m_subscribes)},
{"broadcasts", AMF0::Number(m_broadcasts)},
{"relaysIn", AMF0::Number(m_relaysIn)},
{"relaysOut", AMF0::Number(m_relaysOut)},
{"publishedDuration", AMF0::Number(::round(m_publishedDuration))},
{"playedDuration", AMF0::Number(::round(m_playedDuration))}
});
showStats = true;
}
virtual std::shared_ptr<WriteReceipt> write(uint32_t streamID, uint8_t messageType, uint32_t timestamp, const void *payload, size_t len, Time startWithin, Time finishWithin) = 0;
std::shared_ptr<WriteReceipt> write(uint32_t streamID, uint8_t messageType, uint32_t timestamp, const Bytes &payload, Time startWithin, Time finishWithin)
{
return write(streamID, messageType, timestamp, payload.data(), payload.size(), startWithin, finishWithin);
}
void sendRelay(Client *sender, const Bytes &message)
{
auto header = AMF0::Object();
header->putValueAtKey(AMF0::String(sender->connectionIDStr()), "sender");
if((not sender->m_publishUsername.empty()) and (sender->m_appName == m_appName))
header->putValueAtKey(AMF0::String(sender->m_publishUsername), "senderName");
Bytes payload;
header->encode(payload);
payload.insert(payload.end(), message.begin(), message.end());
write(0, TCMSG_COMMAND, 0, Message::command("onRelay", 0, nullptr, payload), INFINITY, INFINITY);
relaysOut++;
m_relaysOut++;
m_app->m_relaysOut++;
}
void relayStreamMessage(std::shared_ptr<NetStream> netStream, uint8_t messageType, uint32_t timestamp, const uint8_t *payload, size_t len)
{
assert(NetStream::NS_PLAYING == netStream->m_state);
uint32_t adjustedTimestamp = timestamp - netStream->m_timestampOffset;
if(netStream->m_adjustTimestamps)
{
if( (netStream->m_restarted)
or (Message::timestamp_lt(adjustedTimestamp, netStream->m_highestTimestamp - timestampAdjustmentMargin))
or (Message::timestamp_gt(adjustedTimestamp, netStream->m_highestTimestamp + timestampAdjustmentMargin))
)
{
adjustedTimestamp = netStream->m_highestTimestamp;
netStream->m_timestampOffset = timestamp - adjustedTimestamp;
netStream->m_minTimestamp = adjustedTimestamp;
}
if(Message::timestamp_lt(adjustedTimestamp, netStream->m_minTimestamp))
adjustedTimestamp = netStream->m_minTimestamp;
}
else if((0 == netStream->m_minTimestamp) and (0 == netStream->m_highestTimestamp) and (Message::timestamp_lt(timestamp, 0)))
{
// this only happens if we're tuning in to a stream with current timestamps > 2^31.
netStream->m_highestTimestamp = timestamp;
netStream->m_minTimestamp = timestamp - 3600000;
}
if(timestamp and Message::timestamp_gt(adjustedTimestamp, netStream->m_highestTimestamp))
netStream->m_highestTimestamp = adjustedTimestamp;
if(Message::timestamp_lt(netStream->m_minTimestamp, netStream->m_highestTimestamp - 3600000))
netStream->m_minTimestamp = netStream->m_highestTimestamp - 3600000; // one hour
netStream->m_restarted = false;
Time startWithin = INFINITY;
bool isVideoCodingLayer = false;
switch(messageType)
{
case TCMSG_VIDEO:
if(not App::isVideoSequenceSpecial(payload, len))
{
if(netStream->m_paused or not netStream->m_receiveVideo)
return;
if(App::isVideoCheckpointCommand(payload, len))
startWithin = checkpointLifetime;
else
{
startWithin = netStream->m_videoLifetime;
isVideoCodingLayer = true;
if(not netStream->m_seenKeyframe)
{
if(Message::isVideoKeyframe(payload, len))
netStream->m_seenKeyframe = true;
else
return; // drop VCL messages until first keyframe
}
}
}
break;
case TCMSG_AUDIO:
if(not Message::isAudioSequenceSpecial(payload, len))
{
if(netStream->m_paused or not netStream->m_receiveAudio)
return;
startWithin = netStream->m_audioLifetime;
}
break;
default:
break;
}
auto rv = write(netStream->m_streamID, messageType, adjustedTimestamp, payload, len, startWithin, startWithin + netStream->m_finishByMargin);
if(isVideoCodingLayer and rv)
{
if(Message::isVideoKeyframe(payload, len))
netStream->expireChain();
netStream->m_chain.append(rv);
}
if(verbose and rv)
rv->onFinished = [] (bool abandoned) { if(abandoned) { printf("-"); fflush(stdout); } };
updatePlayedDuration(netStream->updateTimeAccounting(false));
}
void relayStreamMessage(std::shared_ptr<NetStream> netStream, uint8_t messageType, uint32_t timestamp, const Bytes &payload)
{
return relayStreamMessage(netStream, messageType, timestamp, payload.data(), payload.size());
}
void sendPublishNotify(std::shared_ptr<NetStream> netStream, const Stream &stream)
{
netStream->m_restarted = true;
if(not netStream->m_adjustTimestamps)
{
netStream->m_highestTimestamp = 0;
netStream->m_minTimestamp = 0;
netStream->m_timestampOffset = 0;
}
auto infoObject = AMF0::Object();
infoObject
->putValueAtKey(AMF0::String("status"), "level")
->putValueAtKey(AMF0::String("NetStream.Play.PublishNotify"), "code")
->putValueAtKey(AMF0::String(netStream->m_name), "detail")
->putValueAtKey(AMF0::String(netStream->m_hashname), "hashname")
->putValueAtKey(AMF0::String("being published"), "description")
->putValueAtKey(AMF0::Number(stream.m_priority), "priority")
->putValueAtKey(AMF0::String(stream.m_publisher->m_owner->connectionIDStr()), "publisher");
if(not stream.m_publisher->m_owner->m_publishUsername.empty())
infoObject->putValueAtKey(AMF0::String(stream.m_publisher->m_owner->m_publishUsername), "publisherName");
auto onStatusMessage = Message::command("onStatus", 0, nullptr, infoObject);
relayStreamMessage(netStream, TCMSG_COMMAND, 0, onStatusMessage);
for(auto it = stream.m_dataFrames.begin(); it != stream.m_dataFrames.end(); it++)
relayStreamMessage(netStream, TCMSG_DATA, 0, it->second);
if(not stream.m_audioMultichannelConfigBeforeInit.empty())
relayStreamMessage(netStream, TCMSG_AUDIO, 0, stream.m_audioMultichannelConfigBeforeInit);
if(not stream.m_audioInit.empty())
relayStreamMessage(netStream, TCMSG_AUDIO, 0, stream.m_audioInit);
if(not stream.m_audioMultichannelConfigLatest.empty())
relayStreamMessage(netStream, TCMSG_AUDIO, 0, stream.m_audioMultichannelConfigLatest);
if(not stream.m_videoMetadataBeforeInit.empty()) // RTMP Enhanced Video Metadata that goes before Sequence Start/Init
relayStreamMessage(netStream, TCMSG_VIDEO, 0, stream.m_videoMetadataBeforeInit);
if(not stream.m_videoInit.empty())
relayStreamMessage(netStream, TCMSG_VIDEO, 0, stream.m_videoInit);
if(not stream.m_videoMetadataLatest.empty()) // Latest RTMP Enhanced Video Metadata goes after Sequence Start/Init
relayStreamMessage(netStream, TCMSG_VIDEO, 0, stream.m_videoMetadataLatest);
netStream->m_restarted = true;
if(not stream.m_lastVideoKeyframe.empty())
{
relayStreamMessage(netStream, TCMSG_VIDEO, stream.m_lastVideoTimestamp, stream.m_lastVideoKeyframe);
if(not stream.m_lastVideoFrameWasKey)
{
// not all codecs work well if you replay the last keyframe and then
// start sending predicted frames with missing intervening frames.
switch(stream.m_lastVideoCodec)
{
case TC_VIDEO_CODEC_SPARK:
case TC_VIDEO_CODEC_SCREEN:
case TC_VIDEO_CODEC_VP6:
case TC_VIDEO_CODEC_VP6_ALPHA:
case TC_VIDEO_CODEC_SCREEN_V2:
case TC_VIDEO_CODEC_AVC:
case TC_VIDEO_ENH_CODEC_AVC:
// these codecs seem to work ok though.
break;
default:
relayStreamMessage(netStream, TCMSG_VIDEO, stream.m_lastVideoTimestamp, Message::makeVideoEndOfSequence(stream.m_lastVideoCodec));
netStream->m_seenKeyframe = false;
break;
}
}
}
}
void sendUnpublishNotify(std::shared_ptr<NetStream> netStream)
{
syncAudioAndData(netStream->m_streamID);
write(netStream->m_streamID, TCMSG_COMMAND, netStream->m_highestTimestamp, Message::command("onStatus", 0, nullptr,
AMF0::Object()
->putValueAtKey(AMF0::String("status"), "level")
->putValueAtKey(AMF0::String("NetStream.Play.UnpublishNotify"), "code")
->putValueAtKey(AMF0::String(netStream->m_name), "detail")
->putValueAtKey(AMF0::String(netStream->m_hashname), "hashname")
->putValueAtKey(AMF0::String("publish stop"), "description")
), INFINITY, INFINITY);
syncAudioAndData(netStream->m_streamID);
updatePlayedDuration(netStream->updateTimeAccounting(true));
}
void releaseStream(std::shared_ptr<NetStream> netStream)
{
assert(NetStream::NS_PUBLISHING == netStream->m_state);
write(netStream->m_streamID, TCMSG_COMMAND, 0, Message::command("onStatus", 0, nullptr,
AMF0::Object()
->putValueAtKey(AMF0::String("error"), "level")
->putValueAtKey(AMF0::String("NetStream.Publish.BadName"), "code")
->putValueAtKey(AMF0::String("publish terminated by releaseStream"), "description")
->putValueAtKey(AMF0::String(netStream->m_name), "detail")
->putValueAtKey(AMF0::String(netStream->m_hashname), "hashname")
), INFINITY, INFINITY);
closeStream(netStream);
}
virtual Bytes getNearNonce()
{
return Bytes();
}
virtual Bytes getFarNonce()
{
return Bytes();
}
void sendShutdownNotify()
{
write(0, TCMSG_COMMAND, 0, Message::command("onStatus", 0, nullptr,
AMF0::Object()
->putValueAtKey(AMF0::String("status"), "level")
->putValueAtKey(AMF0::String("NetConnection.Shutdown.Notify"), "code") // not NetConnection.Connect.AppShutdown
->putValueAtKey(AMF0::String("server is shutting down, please clean up"), "description")
), INFINITY, INFINITY);
}
protected:
void setRandomConnectionID()
{
assert(0 == m_connectionID.size());
m_connectionID.resize(24);
flashcrypto->pseudoRandomBytes(m_connectionID.data(), m_connectionID.size());
}
std::string connectionIDStr() const
{
return Hex::encode(m_connectionID);
}
void onShutdownComplete()
{
m_finished = true;
clients.erase(m_connectionID);
updateRedirectorLoadFactor();
}
void onMessage(uint32_t streamID, uint8_t messageType, uint32_t timestamp, const uint8_t *payload, size_t len)
{
if(verbose > 1)
{
clientLog("debug-stream", {
{"stringID", AMF0::Number(streamID)},
{"messageType", AMF0::Number(messageType)},
{"messageTimestamp", AMF0::Number(timestamp)},
{"messageLength", AMF0::Number(len)}
});
fflush(stdout);
}
switch(messageType)
{
case TCMSG_COMMAND:
case TCMSG_COMMAND_EX:
onCommandMessage(streamID, messageType, payload, len);
break;
case TCMSG_AUDIO:
case TCMSG_VIDEO:
case TCMSG_DATA:
case TCMSG_DATA_EX:
onStreamMessage(streamID, messageType, timestamp, payload, len);
break;
default:
break;
}
}
void onCommandMessage(uint32_t streamID, uint8_t messageType, const uint8_t *payload, size_t len)
{
const uint8_t *cursor = payload;
const uint8_t *limit = cursor + len;
if(0 == len)
return;
if((TCMSG_COMMAND_EX == messageType) and (0 != *cursor++)) // COMMAND_EX has a format id, and only format id=0 is defined
return;
Args args;
if(not AMF0::decode(cursor, limit, args))
{
if(verbose > 2)
Hex::print("Client::onCommandMessage() couldn't fully decode command arguments", cursor, limit);
}
if(verbose > 1)
{
printf("TCMSG_COMMAND%s\n", TCMSG_COMMAND_EX == messageType ? "_EX" : "");
for(auto it = args.begin(); it != args.end(); it++)
printf(" %s\n", (*it)->repr().c_str());
}
if( (args.size() < 2)
or (not args[0]->isString()) // command name
or (not args[1]->isNumber()) // transaction ID
)
{
clientLog("error", {{"reason", AMF0::String("invalid-command-format")}});
close();
return;
}
if(0 == streamID)
onControlCommand(args);
else
onStreamCommand(streamID, args);
}
void onControlCommand(const Args &args)
{
const char *commandName = args[0]->stringValue();
if(0 == strcmp("connect", commandName))
{
onConnectCommand(args);
return;
}
if(not m_connected)
{
clientLog("error", {{"reason", AMF0::String("command-before-connect")}});
close();
return;
}
if(0 == strcmp("createStream", commandName))
onCreateStreamCommand(args);
else if(0 == strcmp("deleteStream", commandName))
onDeleteStreamCommand(args);
else if(0 == strcmp("relay", commandName))
onRelayCommand(args);
else if(0 == strcmp("broadcast", commandName))
onBroadcastCommand(args);
else if(0 == strcmp("setPeerInfo", commandName))
onSetPeerInfoCommand(args);
else if(0 == strcmp("watch", commandName))
onWatchCommand(args);
else if(0 == strcmp("releaseStream", commandName))
onReleaseStreamCommand(args);
else if(0 == strcmp("FCPublish", commandName))
ackCommandTransaction(args); // ignore
else if(0 == strcmp("FCUnpublish", commandName))
ackCommandTransaction(args); // ignore
else
onUnknownCommand(args);
}
void onStreamCommand(uint32_t streamID, const Args &args)
{
auto it = m_netStreams.find(streamID);
if(m_netStreams.end() == it)
{
close();
return;
}
const char *commandName = args[0]->stringValue();
auto netStream = it->second;
if(0 == strcmp("publish", commandName))
onPublishCommand(netStream, args);
else if(0 == strcmp("play", commandName))
onPlayCommand(netStream, args);
else if(0 == strcmp("closeStream", commandName))
closeStream(netStream);
else if(0 == strcmp("pause", commandName))
onPauseCommand(netStream, args);
else if(0 == strcmp("receiveVideo", commandName))
onReceiveVideoCommand(netStream, args);
else if(0 == strcmp("receiveAudio", commandName))
onReceiveAudioCommand(netStream, args);
}
std::string authChallengeForArgs(const Args &args)
{
if((args.size() > 4) and args[3]->isString() and args[4]->isString())
return std::string(args[3]->stringValue()) + "@" + m_appName;
return m_appName;
}
int validateAuth(const Args &args)
{
if((args.size() < 4) or not args[3]->isString())
return -1;
std::string authChallenge = authChallengeForArgs(args);
std::string authToken = args[((args.size() > 4) and args[4]->isString()) ? 4 : 3]->stringValue();;
Bytes nearNonce = getNearNonce();
for(size_t x = 0; x < secrets.size(); x++)
{
std::string expectedAuth = hexHMACSHA256(secrets[x], authChallenge);
if(expectedAuth == authToken)
return x;
if((not nearNonce.empty()) and (hexHMACSHA256(nearNonce, expectedAuth) == authToken))
return x;
}
return -1;
}
void onConnectCommand(const Args &args)
{
if(args.size() < 3)
{
clientLog("error", {{"reason", AMF0::String("connect-missing-arg")}});
close();
return;
}
if(m_connecting)
{
clientLog("error", {{"reason", AMF0::String("connect-after-connect")}});
close();
return;
}
m_connecting = true;
auto commandObject = args[2]->asObject();
if(not commandObject)
{
clientLog("error", {{"reason", AMF0::String("connect-missing-command-object")}});
close();
return;
}
auto app = commandObject->getValueAtKey("app");
if(not app->isString())
{
auto tcUrl = commandObject->getValueAtKey("tcUrl");
if(not tcUrl->isString())
{
clientLog("error", {{"reason", AMF0::String("connect-missing-app-and-tcUrl")}});
close();
return;
}
URIParse uri(tcUrl->stringValue());
app = AMF0::String(uri.path.substr(0, 1) == "/" ? uri.path.substr(1) : uri.path);
}
m_appName = URIParse::safePercentDecode(URIParse::split(app->stringValue(), '?', 2)[0]);
int matchedKey = -1;
if(secrets.size())
{
matchedKey = validateAuth(args);
if(matchedKey < 0)
{
clientLog("connect-reject", {{"reason", AMF0::String("bad-auth")}, {"requestedApp", app}});
write(0, TCMSG_COMMAND, 0, Message::command("_error", args[1]->doubleValue(), nullptr,
AMF0::Object()
->putValueAtKey(AMF0::String("error"), "level")
->putValueAtKey(AMF0::String("NetConnection.Connect.Rejected"), "code")
->putValueAtKey(AMF0::String("auth required"), "description")
), INFINITY, INFINITY);
close();
return;
}