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降低TCP RTP 2字节头被误判为EHOME头的风险 (#2502)

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当TCP RTP包大小为256字节时，可能触发RtpSplitter::onSearchPacketTail误判为EHOME格式。
这个修改一旦检测到数据不是EHOME格式，则后续不再进行尝试，以减小误判的风险。
This commit is contained in:
dengjfzh 2023-05-27 22:27:10 +08:00 committed by GitHub
parent 032a2ac91d
commit 18dbbc8d19
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 14 additions and 11 deletions
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23
src/Rtp/RtpSplitter.cpp
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@ -46,17 +46,20 @@ const char *RtpSplitter::onSearchPacketTail(const char *data, size_t len) {
return nullptr;
}
if (isEhome(data, len)) {
//是ehome协议
if (len < kEHOME_OFFSET + 4) {
//数据不够
return nullptr;
if ( _is_ehome ) {
if (isEhome(data, len)) {
//是ehome协议
if (len < kEHOME_OFFSET + 4) {
//数据不够
return nullptr;
}
//忽略ehome私有头后是rtsp样式的rtp，多4个字节，
_offset = kEHOME_OFFSET + 4;
_is_ehome = true;
//忽略ehome私有头
return onSearchPacketTail_l(data + kEHOME_OFFSET + 2, len - kEHOME_OFFSET - 2);
}
//忽略ehome私有头后是rtsp样式的rtp，多4个字节，
_offset = kEHOME_OFFSET + 4;
_is_ehome = true;
//忽略ehome私有头
return onSearchPacketTail_l(data + kEHOME_OFFSET + 2, len - kEHOME_OFFSET - 2);
_is_ehome = false;
}
if ( _is_rtsp_interleaved ) {

2
src/Rtp/RtpSplitter.h
View File

@ -35,7 +35,7 @@ protected:
const char *onSearchPacketTail_l(const char *data, size_t len);
private:
bool _is_ehome = false;
bool _is_ehome = true;
bool _is_rtsp_interleaved = true;
size_t _offset = 0;
};