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Refactored source address validation.

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This commit is contained in:
Rolf Ahrenberg 2010-07-02 23:08:02 +03:00
parent a2d8c367f6
commit 12b54fbbc2
1 changed files with 34 additions and 36 deletions
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70
socket.c
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@ -136,46 +136,44 @@ int cIptvUdpSocket::Read(unsigned char* BufferAddr, unsigned int BufferLen)
if (len < 0)
return -1;
else if (len > 0) {
// Process auxiliary received data
// Process auxiliary received data and validate source address
for (cmsg = CMSG_FIRSTHDR(&msgh); cmsg != NULL; cmsg = CMSG_NXTHDR(&msgh, cmsg)) {
if ((cmsg->cmsg_level == SOL_IP) && (cmsg->cmsg_type == IP_PKTINFO)) {
struct in_pktinfo *i = (struct in_pktinfo *)CMSG_DATA(cmsg);
// Validate source address
if (i->ipi_addr.s_addr == inetAddr) {
if (BufferAddr[0] == TS_SYNC_BYTE)
return len;
else if (len > 3) {
// http://www.networksorcery.com/enp/rfc/rfc2250.txt
// version
unsigned int v = (BufferAddr[0] >> 6) & 0x03;
// extension bit
unsigned int x = (BufferAddr[0] >> 4) & 0x01;
// cscr count
unsigned int cc = BufferAddr[0] & 0x0F;
// payload type: MPEG2 TS = 33
//unsigned int pt = readBuffer[1] & 0x7F;
// header lenght
unsigned int headerlen = (3 + cc) * (unsigned int)sizeof(uint32_t);
// check if extension
if (x) {
// extension header length
unsigned int ehl = (((BufferAddr[headerlen + 2] & 0xFF) << 8) |
(BufferAddr[headerlen + 3] & 0xFF));
// update header length
headerlen += (ehl + 1) * (unsigned int)sizeof(uint32_t);
}
// Check that rtp is version 2 and payload contains multiple of TS packet data
if ((v == 2) && (((len - headerlen) % TS_SIZE) == 0) &&
(BufferAddr[headerlen] == TS_SYNC_BYTE)) {
// Set argument point to payload in read buffer
memmove(BufferAddr, &BufferAddr[headerlen], (len - headerlen));
return (len - headerlen);
}
}
if (i->ipi_addr.s_addr != inetAddr)
return 0;
}
}
}
if (BufferAddr[0] == TS_SYNC_BYTE)
return len;
else if (len > 3) {
// http://www.networksorcery.com/enp/rfc/rfc2250.txt
// version
unsigned int v = (BufferAddr[0] >> 6) & 0x03;
// extension bit
unsigned int x = (BufferAddr[0] >> 4) & 0x01;
// cscr count
unsigned int cc = BufferAddr[0] & 0x0F;
// payload type: MPEG2 TS = 33
//unsigned int pt = readBuffer[1] & 0x7F;
// header lenght
unsigned int headerlen = (3 + cc) * (unsigned int)sizeof(uint32_t);
// check if extension
if (x) {
// extension header length
unsigned int ehl = (((BufferAddr[headerlen + 2] & 0xFF) << 8) |
(BufferAddr[headerlen + 3] & 0xFF));
// update header length
headerlen += (ehl + 1) * (unsigned int)sizeof(uint32_t);
}
// Check that rtp is version 2 and payload contains multiple of TS packet data
if ((v == 2) && (((len - headerlen) % TS_SIZE) == 0) &&
(BufferAddr[headerlen] == TS_SYNC_BYTE)) {
// Set argument point to payload in read buffer
memmove(BufferAddr, &BufferAddr[headerlen], (len - headerlen));
return (len - headerlen);
}
}
}
return 0;
}
@ -209,8 +207,8 @@ int cIptvTcpSocket::Read(unsigned char* BufferAddr, unsigned int BufferLen)
socklen_t addrlen = sizeof(sockAddr);
// Read data from socket
if (isActive && socketDesc && BufferAddr && (BufferLen > 0))
len = recvfrom(socketDesc, BufferAddr, BufferLen, MSG_DONTWAIT,
(struct sockaddr *)&sockAddr, &addrlen);
len = (int)recvfrom(socketDesc, BufferAddr, BufferLen, MSG_DONTWAIT,
(struct sockaddr *)&sockAddr, &addrlen);
//if (inetAddr != sockAddr.sin_addr.s_addr)
// return -1;
return len;