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mirror of https://github.com/rofafor/vdr-plugin-satip.git synced 2023-10-10 13:37:42 +02:00
vdr-plugin-satip/socket.c
2017-01-05 17:27:13 +02:00

350 lines
11 KiB
C

/*
* socket.c: SAT>IP plugin for the Video Disk Recorder
*
* See the README file for copyright information and how to reach the author.
*
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <net/if.h>
#include <netdb.h>
#include <fcntl.h>
#include <unistd.h>
#include <vdr/device.h>
#include "common.h"
#include "config.h"
#include "log.h"
#include "socket.h"
#if defined(__GLIBC__)
#if defined(__GLIBC_PREREQ)
#if !__GLIBC_PREREQ(2,12)
#define __SATIP_DISABLE_RECVMMSG__
#endif
#endif
#endif
cSatipSocket::cSatipSocket()
: socketPortM(0),
socketDescM(-1),
isMulticastM(false),
useSsmM(false),
streamAddrM(htonl(INADDR_ANY)),
sourceAddrM(htonl(INADDR_ANY))
{
debug1("%s", __PRETTY_FUNCTION__);
memset(&sockAddrM, 0, sizeof(sockAddrM));
}
cSatipSocket::~cSatipSocket()
{
debug1("%s", __PRETTY_FUNCTION__);
// Close the socket
Close();
}
bool cSatipSocket::Open(const int portP, const bool reuseP)
{
// If socket is there already and it is bound to a different port, it must
// be closed first
if (portP != socketPortM) {
debug1("%s (%d, %d) Socket tear-down", __PRETTY_FUNCTION__, portP, reuseP);
Close();
}
// Bind to the socket if it is not active already
if (socketDescM < 0) {
int yes;
socklen_t len = sizeof(sockAddrM);
// Create socket
socketDescM = socket(PF_INET, SOCK_DGRAM, 0);
ERROR_IF_RET(socketDescM < 0, "socket()", return false);
// Make it use non-blocking I/O to avoid stuck read calls
ERROR_IF_FUNC(fcntl(socketDescM, F_SETFL, O_NONBLOCK), "fcntl(O_NONBLOCK)",
Close(), return false);
// Allow multiple sockets to use the same PORT number
yes = reuseP;
ERROR_IF_FUNC(setsockopt(socketDescM, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes)) < 0,
"setsockopt(SO_REUSEADDR)", Close(), return false);
yes = reuseP;
#ifdef SO_REUSEPORT
ERROR_IF_FUNC(setsockopt(socketDescM, SOL_SOCKET, SO_REUSEPORT, &yes, sizeof(yes)) < 0 && errno != ENOPROTOOPT,
"setsockopt(SO_REUSEPORT)", Close(), return false);
#endif
#ifndef __FreeBSD__
// Allow packet information to be fetched
ERROR_IF_FUNC(setsockopt(socketDescM, SOL_IP, IP_PKTINFO, &yes, sizeof(yes)) < 0,
"setsockopt(IP_PKTINFO)", Close(), return false);
#endif // __FreeBSD__
// Bind socket
memset(&sockAddrM, 0, sizeof(sockAddrM));
sockAddrM.sin_family = AF_INET;
sockAddrM.sin_port = htons((uint16_t)(portP & 0xFFFF));
sockAddrM.sin_addr.s_addr = htonl(INADDR_ANY);
ERROR_IF_FUNC(bind(socketDescM, (struct sockaddr *)&sockAddrM, sizeof(sockAddrM)) < 0,
"bind()", Close(), return false);
// Update socket port
ERROR_IF_FUNC(getsockname(socketDescM, (struct sockaddr*)&sockAddrM, &len) < 0,
"getsockname()", Close(), return false);
socketPortM = ntohs(sockAddrM.sin_port);
isMulticastM = false;
}
debug1("%s (%d) socketPort=%d", __PRETTY_FUNCTION__, portP, socketPortM);
return true;
}
bool cSatipSocket::OpenMulticast(const int portP, const char *streamAddrP, const char *sourceAddrP)
{
debug1("%s (%d, %s, %s)", __PRETTY_FUNCTION__, portP, streamAddrP, sourceAddrP);
if (Open(portP)) {
CheckAddress(streamAddrP, &streamAddrM);
if (!isempty(sourceAddrP))
useSsmM = CheckAddress(sourceAddrP, &sourceAddrM);
return Join();
}
return false;
}
void cSatipSocket::Close(void)
{
debug1("%s sockerPort=%d", __PRETTY_FUNCTION__, socketPortM);
// Check if socket exists
if (socketDescM >= 0) {
Leave();
close(socketDescM);
socketDescM = -1;
socketPortM = 0;
memset(&sockAddrM, 0, sizeof(sockAddrM));
streamAddrM = htonl(INADDR_ANY);
sourceAddrM = htonl(INADDR_ANY);
isMulticastM = false;
useSsmM = false;
}
}
bool cSatipSocket::Flush(void)
{
debug1("%s", __PRETTY_FUNCTION__);
if (socketDescM < 0) {
const unsigned int len = 65535;
unsigned char *buf = MALLOC(unsigned char, len);
if (buf) {
int i = 0;
do {
// Sanity check
if (++i > 10)
break;
} while (Read(buf, len));
return true;
}
}
return false;
}
bool cSatipSocket::CheckAddress(const char *addrP, in_addr_t *inAddrP)
{
if (inAddrP) {
// First try only the IP address
*inAddrP = inet_addr(addrP);
if (*inAddrP == htonl(INADDR_NONE)) {
debug1("%s (%s, ) Cannot convert to address", __PRETTY_FUNCTION__, addrP);
// It may be a host name, get the name
struct hostent *host = gethostbyname(addrP);
if (!host) {
char tmp[64];
error("gethostbyname() failed: %s is not valid address: %s", addrP,
strerror_r(h_errno, tmp, sizeof(tmp)));
return false;
}
*inAddrP = inet_addr(*host->h_addr_list);
}
return true;
}
return false;
}
bool cSatipSocket::Join(void)
{
debug1("%s", __PRETTY_FUNCTION__);
// Check if socket exists
if (socketDescM >= 0 && !isMulticastM) {
// Join a new multicast group
if (useSsmM) {
// Source-specific multicast (SSM) is used
struct group_source_req gsr;
struct sockaddr_in *grp;
struct sockaddr_in *src;
gsr.gsr_interface = 0; // if_nametoindex("any") ?
grp = (struct sockaddr_in*)&gsr.gsr_group;
grp->sin_family = AF_INET;
grp->sin_addr.s_addr = streamAddrM;
grp->sin_port = 0;
src = (struct sockaddr_in*)&gsr.gsr_source;
src->sin_family = AF_INET;
src->sin_addr.s_addr = sourceAddrM;
src->sin_port = 0;
ERROR_IF_RET(setsockopt(socketDescM, SOL_IP, MCAST_JOIN_SOURCE_GROUP, &gsr, sizeof(gsr)) < 0, "setsockopt(MCAST_JOIN_SOURCE_GROUP)", return false);
}
else {
struct ip_mreq mreq;
mreq.imr_multiaddr.s_addr = streamAddrM;
mreq.imr_interface.s_addr = htonl(INADDR_ANY);
ERROR_IF_RET(setsockopt(socketDescM, SOL_IP, IP_ADD_MEMBERSHIP, &mreq, sizeof(mreq)) < 0, "setsockopt(IP_ADD_MEMBERSHIP)", return false);
}
// Update multicasting flag
isMulticastM = true;
}
return true;
}
bool cSatipSocket::Leave(void)
{
debug1("%s", __PRETTY_FUNCTION__);
// Check if socket exists
if (socketDescM >= 0 && isMulticastM) {
// Leave the existing multicast group
if (useSsmM) {
// Source-specific multicast (SSM) is used
struct group_source_req gsr;
struct sockaddr_in *grp;
struct sockaddr_in *src;
gsr.gsr_interface = 0; // if_nametoindex("any") ?
grp = (struct sockaddr_in*)&gsr.gsr_group;
grp->sin_family = AF_INET;
grp->sin_addr.s_addr = streamAddrM;
grp->sin_port = 0;
src = (struct sockaddr_in*)&gsr.gsr_source;
src->sin_family = AF_INET;
src->sin_addr.s_addr = sourceAddrM;
src->sin_port = 0;
ERROR_IF_RET(setsockopt(socketDescM, SOL_IP, MCAST_LEAVE_SOURCE_GROUP, &gsr, sizeof(gsr)) < 0, "setsockopt(MCAST_LEAVE_SOURCE_GROUP)", return false);
}
else {
struct ip_mreq mreq;
mreq.imr_multiaddr.s_addr = streamAddrM;
mreq.imr_interface.s_addr = htonl(INADDR_ANY);
ERROR_IF_RET(setsockopt(socketDescM, SOL_IP, IP_DROP_MEMBERSHIP, &mreq, sizeof(mreq)) < 0, "setsockopt(IP_DROP_MEMBERSHIP)", return false);
}
// Update multicasting flag
isMulticastM = false;
}
return true;
}
int cSatipSocket::Read(unsigned char *bufferAddrP, unsigned int bufferLenP)
{
debug16("%s (, %d)", __PRETTY_FUNCTION__, bufferLenP);
// Error out if socket not initialized
if (socketDescM <= 0) {
error("%s Invalid socket", __PRETTY_FUNCTION__);
return -1;
}
int len = 0;
// Read data from socket in a loop
do {
socklen_t addrlen = sizeof(sockAddrM);
struct msghdr msgh;
struct iovec iov;
char cbuf[256];
len = 0;
// Initialize iov and msgh structures
memset(&msgh, 0, sizeof(struct msghdr));
iov.iov_base = bufferAddrP;
iov.iov_len = bufferLenP;
msgh.msg_control = cbuf;
msgh.msg_controllen = sizeof(cbuf);
msgh.msg_name = &sockAddrM;
msgh.msg_namelen = addrlen;
msgh.msg_iov = &iov;
msgh.msg_iovlen = 1;
msgh.msg_flags = 0;
if (socketDescM && bufferAddrP && (bufferLenP > 0))
len = (int)recvmsg(socketDescM, &msgh, MSG_DONTWAIT);
if (len > 0) {
#ifndef __FreeBSD__
if (isMulticastM) {
// Process auxiliary received data and validate source address
for (struct cmsghdr *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);
if ((i->ipi_addr.s_addr == streamAddrM) || (htonl(INADDR_ANY) == streamAddrM))
return len;
}
}
}
else
#endif // __FreeBSD__
return len;
}
} while (len > 0);
ERROR_IF_RET(len < 0 && errno != EAGAIN && errno != EWOULDBLOCK, "recvmsg()", return -1);
return 0;
}
int cSatipSocket::ReadMulti(unsigned char *bufferAddrP, unsigned int *elementRecvSizeP, unsigned int elementCountP, unsigned int elementBufferSizeP)
{
debug16("%s (, , %d, %d)", __PRETTY_FUNCTION__, elementCountP, elementBufferSizeP);
int count = -1;
// Error out if socket not initialized
if (socketDescM <= 0) {
error("%s Invalid socket", __PRETTY_FUNCTION__);
return -1;
}
if (!bufferAddrP || !elementRecvSizeP || !elementCountP || !elementBufferSizeP) {
error("%s Invalid parameter(s)", __PRETTY_FUNCTION__);
return -1;
}
#ifndef __SATIP_DISABLE_RECVMMSG__
// Initialize iov and msgh structures
struct mmsghdr mmsgh[elementCountP];
struct iovec iov[elementCountP];
memset(mmsgh, 0, sizeof(mmsgh[0]) * elementCountP);
for (unsigned int i = 0; i < elementCountP; ++i) {
iov[i].iov_base = bufferAddrP + i * elementBufferSizeP;
iov[i].iov_len = elementBufferSizeP;
mmsgh[i].msg_hdr.msg_iov = &iov[i];
mmsgh[i].msg_hdr.msg_iovlen = 1;
}
// Read data from socket as a set
count = (int)recvmmsg(socketDescM, mmsgh, elementCountP, MSG_DONTWAIT, NULL);
ERROR_IF_RET(count < 0 && errno != EAGAIN && errno != EWOULDBLOCK, "recvmmsg()", return -1);
for (int i = 0; i < count; ++i)
elementRecvSizeP[i] = mmsgh[i].msg_len;
#else
count = 0;
while (count < (int)elementCountP) {
int len = Read(bufferAddrP + count * elementBufferSizeP, elementBufferSizeP);
if (len < 0)
return -1;
else if (len == 0)
break;
elementRecvSizeP[count++] = len;
}
#endif
debug16("%s Received %d packets size[0]=%d", __PRETTY_FUNCTION__, count, elementRecvSizeP[0]);
return count;
}
bool cSatipSocket::Write(const char *addrP, const unsigned char *bufferAddrP, unsigned int bufferLenP)
{
debug1("%s (%s, , %d)", __PRETTY_FUNCTION__, addrP, bufferLenP);
// Error out if socket not initialized
if (socketDescM <= 0) {
error("%s Invalid socket", __PRETTY_FUNCTION__);
return false;
}
struct sockaddr_in sockAddr;
memset(&sockAddr, 0, sizeof(sockAddr));
sockAddr.sin_family = AF_INET;
sockAddr.sin_port = htons((uint16_t)(socketPortM & 0xFFFF));
sockAddr.sin_addr.s_addr = inet_addr(addrP);
ERROR_IF_RET(sendto(socketDescM, bufferAddrP, bufferLenP, 0, (struct sockaddr *)&sockAddr, sizeof(sockAddr)) < 0, "sendto()", return false);
return true;
}