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Added validation for source addresses of socket data.

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This commit is contained in:
Rolf Ahrenberg
2010-07-02 18:28:49 +03:00
parent 8a96e5b327
commit 3f88e7a911
6 changed files with 92 additions and 53 deletions
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1
HISTORY
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@@ -146,3 +146,4 @@ VDR Plugin 'iptv' Revision History
- Renamed Sid scanner to section id scanner and added
experimental Tid/Nid support into it.
- Added validation for source addresses of socket data.

2
protocolext.c
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@@ -109,7 +109,7 @@ bool cIptvProtocolExt::Open(void)
if (!strlen(*scriptFile))
return false;
// Create the listening socket
OpenSocket(socketPort);
OpenSocket(INADDR_LOOPBACK, socketPort);
// Execute the external script
ExecuteScript();
isActive = true;

6
protocolhttp.c
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@@ -40,9 +40,6 @@ bool cIptvProtocolHttp::Connect(void)
debug("cIptvProtocolHttp::Connect()\n");
// Check that stream address is valid
if (!isActive && !isempty(streamAddr) && !isempty(streamPath)) {
// Ensure that socket is valid
OpenSocket(socketPort);
// First try only the IP address
sockAddr.sin_addr.s_addr = inet_addr(streamAddr);
@@ -61,6 +58,9 @@ bool cIptvProtocolHttp::Connect(void)
sockAddr.sin_addr.s_addr = inet_addr(*host->h_addr_list);
}
// Ensure that socket is valid
OpenSocket(sockAddr.sin_addr.s_addr, socketPort);
int err = connect(socketDesc, (struct sockaddr *)&sockAddr, sizeof(sockAddr));
// Non-blocking sockets always report in-progress error when connected
ERROR_IF_FUNC(err < 0 && errno != EINPROGRESS, "connect()", CloseSocket(), return false);

4
protocoludp.c
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@@ -39,7 +39,7 @@ bool cIptvProtocolUdp::JoinMulticast(void)
// Check that stream address is valid
if (!isActive && !isempty(streamAddr)) {
// Ensure that socket is valid
OpenSocket(socketPort);
OpenSocket(inet_addr(streamAddr), socketPort);
// Join a new multicast group
struct ip_mreq mreq;
mreq.imr_multiaddr.s_addr = inet_addr(streamAddr);
@@ -59,7 +59,7 @@ bool cIptvProtocolUdp::DropMulticast(void)
// Check that stream address is valid
if (isActive && !isempty(streamAddr)) {
// Ensure that socket is valid
OpenSocket(socketPort);
OpenSocket(inet_addr(streamAddr), socketPort);
// Drop the multicast group
struct ip_mreq mreq;
mreq.imr_multiaddr.s_addr = inet_addr(streamAddr);

123
socket.c
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@@ -18,11 +18,13 @@
#include "socket.h"
cIptvSocket::cIptvSocket()
: socketPort(0),
socketDesc(-1),
: socketDesc(-1),
socketPort(0),
inetAddr(INADDR_NONE),
isActive(false)
{
debug("cIptvSocket::cIptvSocket()\n");
memset(&sockAddr, 0, sizeof(sockAddr));
}
cIptvSocket::~cIptvSocket()
@@ -32,9 +34,11 @@ cIptvSocket::~cIptvSocket()
CloseSocket();
}
bool cIptvSocket::OpenSocket(const int Port, const bool isUdp)
bool cIptvSocket::OpenSocket(const in_addr_t InetAddr, const int Port, const bool isUdp)
{
debug("cIptvSocket::OpenSocket()\n");
if (inetAddr != InetAddr)
inetAddr = InetAddr;
// If socket is there already and it is bound to a different port, it must
// be closed first
if (Port != socketPort) {
@@ -57,7 +61,7 @@ bool cIptvSocket::OpenSocket(const int Port, const bool isUdp)
ERROR_IF_FUNC(setsockopt(socketDesc, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes)) < 0, "setsockopt()",
CloseSocket(), return false);
// Bind socket
memset(&sockAddr, '\0', sizeof(sockAddr));
memset(&sockAddr, 0, sizeof(sockAddr));
sockAddr.sin_family = AF_INET;
sockAddr.sin_port = htons((uint16_t)(Port & 0xFFFF));
sockAddr.sin_addr.s_addr = htonl(INADDR_ANY);
@@ -78,6 +82,9 @@ void cIptvSocket::CloseSocket(void)
if (socketDesc >= 0) {
close(socketDesc);
socketDesc = -1;
socketPort = 0;
inetAddr = INADDR_NONE;
memset(&sockAddr, 0, sizeof(sockAddr));
}
}
@@ -92,10 +99,10 @@ cIptvUdpSocket::~cIptvUdpSocket()
debug("cIptvUdpSocket::~cIptvUdpSocket()\n");
}
bool cIptvUdpSocket::OpenSocket(const int Port)
bool cIptvUdpSocket::OpenSocket(const in_addr_t InetAddr, const int Port)
{
debug("cIptvUdpSocket::OpenSocket()\n");
return cIptvSocket::OpenSocket(Port, true);
return cIptvSocket::OpenSocket(InetAddr, Port, true);
}
int cIptvUdpSocket::Read(unsigned char* BufferAddr, unsigned int BufferLen)
@@ -108,40 +115,67 @@ int cIptvUdpSocket::Read(unsigned char* BufferAddr, unsigned int BufferLen)
}
socklen_t addrlen = sizeof(sockAddr);
int len = 0;
struct msghdr msgh;
struct cmsghdr *cmsg;
struct iovec iov;
char cbuf[256];
// Initialize iov and msgh structures
memset(&msgh, 0, sizeof(struct msghdr));
iov.iov_base = BufferAddr;
iov.iov_len = BufferLen;
msgh.msg_control = cbuf;
msgh.msg_controllen = sizeof(cbuf);
msgh.msg_name = &sockAddr;
msgh.msg_namelen = addrlen;
msgh.msg_iov = &iov;
msgh.msg_iovlen = 1;
msgh.msg_flags = 0;
// Read data from socket
if (isActive && socketDesc && BufferAddr && (BufferLen > 0))
len = (int)recvfrom(socketDesc, BufferAddr, BufferLen, MSG_DONTWAIT,
(struct sockaddr *)&sockAddr, &addrlen);
if ((len > 0) && (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);
}
len = (int)recvmsg(socketDesc, &msgh, MSG_DONTWAIT);
if (len < 0)
return -1;
else if (len > 0) {
// Process auxiliary received data
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);
}
}
return 0;
}
}
}
}
return 0;
}
@@ -157,10 +191,10 @@ cIptvTcpSocket::~cIptvTcpSocket()
debug("cIptvTcpSocket::~cIptvTcpSocket()\n");
}
bool cIptvTcpSocket::OpenSocket(const int Port)
bool cIptvTcpSocket::OpenSocket(const in_addr_t InetAddr, const int Port)
{
debug("cIptvTcpSocket::OpenSocket()\n");
return cIptvSocket::OpenSocket(Port, false);
return cIptvSocket::OpenSocket(InetAddr, Port, false);
}
int cIptvTcpSocket::Read(unsigned char* BufferAddr, unsigned int BufferLen)
@@ -171,10 +205,13 @@ int cIptvTcpSocket::Read(unsigned char* BufferAddr, unsigned int BufferLen)
error("Invalid socket in %s\n", __FUNCTION__);
return -1;
}
int len = 0;
socklen_t addrlen = sizeof(sockAddr);
// Read data from socket
if (isActive && socketDesc && BufferAddr && (BufferLen > 0))
return (int)recvfrom(socketDesc, BufferAddr, BufferLen, MSG_DONTWAIT,
(struct sockaddr *)&sockAddr, &addrlen);
return 0;
len = recvfrom(socketDesc, BufferAddr, BufferLen, MSG_DONTWAIT,
(struct sockaddr *)&sockAddr, &addrlen);
//if (inetAddr != sockAddr.sin_addr.s_addr)
// return -1;
return len;
}

9
socket.h
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@@ -12,13 +12,14 @@
class cIptvSocket {
protected:
int socketPort;
int socketDesc;
int socketPort;
in_addr_t inetAddr;
struct sockaddr_in sockAddr;
bool isActive;
protected:
bool OpenSocket(const int Port, const bool isUdp);
bool OpenSocket(const in_addr_t InetAddr, const int Port, const bool isUdp);
void CloseSocket(void);
public:
@@ -31,7 +32,7 @@ public:
cIptvUdpSocket();
virtual ~cIptvUdpSocket();
virtual int Read(unsigned char* BufferAddr, unsigned int BufferLen);
bool OpenSocket(const int Port);
bool OpenSocket(const in_addr_t InetAddr, const int Port);
};
class cIptvTcpSocket : public cIptvSocket {
@@ -39,7 +40,7 @@ public:
cIptvTcpSocket();
virtual ~cIptvTcpSocket();
virtual int Read(unsigned char* BufferAddr, unsigned int BufferLen);
bool OpenSocket(const int Port);
bool OpenSocket(const in_addr_t InetAddr, const int Port);
};
#endif // __IPTV_SOCKET_H