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拷贝后再修改rtp，防止修改共享数据

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This commit is contained in:
xiongziliang 2021-05-08 21:16:51 +08:00
parent 47dc661bb2
commit 60a6d4af0b
4 changed files with 36 additions and 59 deletions
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37
webrtc/SrtpSession.cpp
View File

@ -231,23 +231,11 @@ namespace RTC
}
}
bool SrtpSession::EncryptRtp(const uint8_t** data, size_t* len, uint8_t pt)
bool SrtpSession::EncryptRtp(uint8_t* data, size_t* len)
{
MS_TRACE();
// Ensure that the resulting SRTP packet fits into the encrypt buffer.
if (*len + SRTP_MAX_TRAILER_LEN > EncryptBufferSize)
{
MS_WARN_TAG(srtp, "cannot encrypt RTP packet, size too big (%zu bytes)", *len);
return false;
}
std::memcpy(EncryptBuffer, *data, *len);
EncryptBuffer[1] = (pt & 0x7F) | (EncryptBuffer[1] & 0x80);
srtp_err_status_t err =
srtp_protect(this->session, static_cast<void*>(EncryptBuffer), reinterpret_cast<int*>(len));
srtp_protect(this->session, static_cast<void*>(data), reinterpret_cast<int*>(len));
if (DepLibSRTP::IsError(err))
{
@ -256,9 +244,6 @@ namespace RTC
return false;
}
// Update the given data pointer.
*data = (const uint8_t*)EncryptBuffer;
return true;
}
@ -279,22 +264,11 @@ namespace RTC
return true;
}
bool SrtpSession::EncryptRtcp(const uint8_t** data, size_t* len)
bool SrtpSession::EncryptRtcp(uint8_t* data, size_t* len)
{
MS_TRACE();
// Ensure that the resulting SRTCP packet fits into the encrypt buffer.
if (*len + SRTP_MAX_TRAILER_LEN > EncryptBufferSize)
{
MS_WARN_TAG(srtp, "cannot encrypt RTCP packet, size too big (%zu bytes)", *len);
return false;
}
std::memcpy(EncryptBuffer, *data, *len);
srtp_err_status_t err = srtp_protect_rtcp(
this->session, static_cast<void*>(EncryptBuffer), reinterpret_cast<int*>(len));
this->session, static_cast<void*>(data), reinterpret_cast<int*>(len));
if (DepLibSRTP::IsError(err))
{
@ -303,9 +277,6 @@ namespace RTC
return false;
}
// Update the given data pointer.
*data = (const uint8_t*)EncryptBuffer;
return true;
}

7
webrtc/SrtpSession.hpp
View File

@ -64,9 +64,9 @@ namespace RTC
~SrtpSession();
public:
bool EncryptRtp(const uint8_t** data, size_t* len, uint8_t pt);
bool EncryptRtp(uint8_t* data, size_t* len);
bool DecryptSrtp(uint8_t* data, size_t* len);
bool EncryptRtcp(const uint8_t** data, size_t* len);
bool EncryptRtcp(uint8_t* data, size_t* len);
bool DecryptSrtcp(uint8_t* data, size_t* len);
void RemoveStream(uint32_t ssrc)
{
@ -76,9 +76,6 @@ namespace RTC
private:
// Allocated by this.
srtp_t session{ nullptr };
//rtp包最大1600
static constexpr size_t EncryptBufferSize{ 2000 };
uint8_t EncryptBuffer[EncryptBufferSize];
DepLibSRTP::Ptr _env;
};
} // namespace RTC

39
webrtc/WebRtcTransport.cpp
View File

@ -266,25 +266,24 @@ void WebRtcTransport::inputSockData(char *buf, size_t len, RTC::TransportTuple *
}
}
void WebRtcTransport::sendRtpPacket(char *buf, size_t len, bool flush, uint8_t pt) {
const uint8_t *p = (uint8_t *) buf;
bool ret = false;
void WebRtcTransport::sendRtpPacket(char *buf, size_t len, bool flush, TrackType type) {
if (_srtp_session_send) {
ret = _srtp_session_send->EncryptRtp(&p, &len, pt);
CHECK(len + SRTP_MAX_TRAILER_LEN <= sizeof(_srtp_buf));
memcpy(_srtp_buf, buf, len);
onBeforeEncryptRtp((char *) _srtp_buf, len, type);
if (_srtp_session_send->EncryptRtp(_srtp_buf, &len)) {
onSendSockData((char *) _srtp_buf, len, flush);
}
if (ret) {
onSendSockData((char *) p, len, flush);
}
}
void WebRtcTransport::sendRtcpPacket(char *buf, size_t len, bool flush){
const uint8_t *p = (uint8_t *) buf;
bool ret = false;
if (_srtp_session_send) {
ret = _srtp_session_send->EncryptRtcp(&p, &len);
CHECK(len + SRTP_MAX_TRAILER_LEN <= sizeof(_srtp_buf));
memcpy(_srtp_buf, buf, len);
if (_srtp_session_send->EncryptRtcp(_srtp_buf, &len)) {
onSendSockData((char *) _srtp_buf, len, flush);
}
if (ret) {
onSendSockData((char *) p, len, flush);
}
}
@ -611,6 +610,7 @@ void WebRtcTransportImp::onRtcp(const char *buf, size_t len) {
}
case RtcpType::RTCP_PSFB:
case RtcpType::RTCP_RTPFB: {
DebugL << "\r\n" << rtcp->dumpString();
break;
}
default: break;
@ -663,8 +663,7 @@ static void setExtType(RtpExt &ext, RtpExtType tp) {
}
template<typename Type>
static void changeRtpExtId(const RtpPacket::Ptr &rtp, const Type &map) {
auto header = rtp->getHeader();
static void changeRtpExtId(const RtpHeader *header, const Type &map) {
auto ext_map = RtpExt::getExtValue(header);
for (auto &pr : ext_map) {
auto it = map.find((typename Type::key_type) (pr.first));
@ -675,29 +674,35 @@ static void changeRtpExtId(const RtpPacket::Ptr &rtp, const Type &map) {
}
setExtType(pr.second, it->first);
setExtType(pr.second, it->second);
DebugL << pr.second.dumpString();
pr.second.setExtId((uint8_t) it->second);
}
}
void WebRtcTransportImp::onBeforeSortedRtp(const RtpPayloadInfo &info, const RtpPacket::Ptr &rtp) {
changeRtpExtId(rtp, _rtp_ext_id_to_type);
changeRtpExtId(rtp->getHeader(), _rtp_ext_id_to_type);
//统计rtp收到的情况，好做rr汇报
info.rtcp_context_recv->onRtp(rtp->getSeq(), rtp->getStampMS(), rtp->size() - RtpPacket::kRtpTcpHeaderSize);
}
void WebRtcTransportImp::onSendRtp(const RtpPacket::Ptr &rtp, bool flush){
auto &pt = _send_rtp_pt[rtp->type];
auto pt = _send_rtp_pt[rtp->type];
if (pt == 0xFF) {
//忽略，对方不支持该编码类型
return;
}
changeRtpExtId(rtp, _rtp_ext_type_to_id);
_bytes_usage += rtp->size() - RtpPacket::kRtpTcpHeaderSize;
sendRtpPacket(rtp->data() + RtpPacket::kRtpTcpHeaderSize, rtp->size() - RtpPacket::kRtpTcpHeaderSize, flush, pt);
sendRtpPacket(rtp->data() + RtpPacket::kRtpTcpHeaderSize, rtp->size() - RtpPacket::kRtpTcpHeaderSize, flush, rtp->type);
//统计rtp发送情况，好做sr汇报
_rtp_info_pt[pt].rtcp_context_send->onRtp(rtp->getSeq(), rtp->getStampMS(), rtp->size() - RtpPacket::kRtpTcpHeaderSize);
}
void WebRtcTransportImp::onBeforeEncryptRtp(const char *buf, size_t len, TrackType type) {
auto header = (RtpHeader *)buf;
header->pt = _send_rtp_pt[type];
changeRtpExtId(header, _rtp_ext_type_to_id);
}
void WebRtcTransportImp::onShutdown(const SockException &ex){
InfoL << ex.what();
_self = nullptr;

8
webrtc/WebRtcTransport.h
View File

@ -60,9 +60,9 @@ public:
* @param buf rtcp内容
* @param len rtcp长度
* @param flush 是否flush socket
* @param pt rtp payload type
* @param type rtp类型
*/
void sendRtpPacket(char *buf, size_t len, bool flush, uint8_t pt);
void sendRtpPacket(char *buf, size_t len, bool flush, TrackType type);
void sendRtcpPacket(char *buf, size_t len, bool flush);
const EventPoller::Ptr& getPoller() const;
@ -100,6 +100,7 @@ protected:
virtual void onRtp(const char *buf, size_t len) = 0;
virtual void onRtcp(const char *buf, size_t len) = 0;
virtual void onShutdown(const SockException &ex) = 0;
virtual void onBeforeEncryptRtp(const char *buf, size_t len, TrackType type) = 0;
protected:
const RtcSession& getSdp(SdpType type) const;
@ -112,6 +113,7 @@ private:
void setRemoteDtlsFingerprint(const RtcSession &remote);
private:
uint8_t _srtp_buf[2000];
EventPoller::Ptr _poller;
std::shared_ptr<RTC::IceServer> _ice_server;
std::shared_ptr<RTC::DtlsTransport> _dtls_transport;
@ -150,6 +152,8 @@ protected:
void onRtp(const char *buf, size_t len) override;
void onRtcp(const char *buf, size_t len) override;
void onBeforeEncryptRtp(const char *buf, size_t len, TrackType type) override;
void onShutdown(const SockException &ex) override;
///////MediaSourceEvent override///////