mirror of
https://github.com/rofafor/vdr-plugin-satip.git
synced 2023-10-10 13:37:42 +02:00
369 lines
12 KiB
C
369 lines
12 KiB
C
/*
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* socket.c: SAT>IP plugin for the Video Disk Recorder
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*
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* See the README file for copyright information and how to reach the author.
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*
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*/
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <net/if.h>
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#include <netdb.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <vdr/device.h>
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#include "common.h"
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#include "config.h"
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#include "log.h"
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#include "socket.h"
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#if defined(__GLIBC__)
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#if defined(__GLIBC_PREREQ)
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#if !__GLIBC_PREREQ(2,12)
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#define __SATIP_DISABLE_RECVMMSG__
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#endif
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#endif
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#endif
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cSatipSocket::cSatipSocket()
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: socketPortM(0),
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socketDescM(-1),
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isMulticastM(false),
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useSsmM(false),
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streamAddrM(htonl(INADDR_ANY)),
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sourceAddrM(htonl(INADDR_ANY)),
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rcvBufSizeM(0)
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{
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debug1("%s", __PRETTY_FUNCTION__);
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memset(&sockAddrM, 0, sizeof(sockAddrM));
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}
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cSatipSocket::cSatipSocket(size_t rcvBufSizeP)
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: socketPortM(0),
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socketDescM(-1),
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isMulticastM(false),
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useSsmM(false),
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streamAddrM(htonl(INADDR_ANY)),
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sourceAddrM(htonl(INADDR_ANY)),
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rcvBufSizeM(rcvBufSizeP)
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{
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debug1("%s", __PRETTY_FUNCTION__);
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memset(&sockAddrM, 0, sizeof(sockAddrM));
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}
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cSatipSocket::~cSatipSocket()
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{
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debug1("%s", __PRETTY_FUNCTION__);
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// Close the socket
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Close();
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}
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bool cSatipSocket::Open(const int portP, const bool reuseP)
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{
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// If socket is there already and it is bound to a different port, it must
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// be closed first
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if (portP != socketPortM) {
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debug1("%s (%d, %d) Socket tear-down", __PRETTY_FUNCTION__, portP, reuseP);
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Close();
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}
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// Bind to the socket if it is not active already
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if (socketDescM < 0) {
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int yes;
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socklen_t len = sizeof(sockAddrM);
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// Create socket
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socketDescM = socket(PF_INET, SOCK_DGRAM, 0);
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ERROR_IF_RET(socketDescM < 0, "socket()", return false);
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// Make it use non-blocking I/O to avoid stuck read calls
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ERROR_IF_FUNC(fcntl(socketDescM, F_SETFL, O_NONBLOCK), "fcntl(O_NONBLOCK)",
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Close(), return false);
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// Allow multiple sockets to use the same PORT number
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yes = reuseP;
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ERROR_IF_FUNC(setsockopt(socketDescM, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes)) < 0,
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"setsockopt(SO_REUSEADDR)", Close(), return false);
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yes = reuseP;
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#ifdef SO_REUSEPORT
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ERROR_IF_FUNC(setsockopt(socketDescM, SOL_SOCKET, SO_REUSEPORT, &yes, sizeof(yes)) < 0 && errno != ENOPROTOOPT,
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"setsockopt(SO_REUSEPORT)", Close(), return false);
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#endif
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#ifndef __FreeBSD__
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// Allow packet information to be fetched
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ERROR_IF_FUNC(setsockopt(socketDescM, SOL_IP, IP_PKTINFO, &yes, sizeof(yes)) < 0,
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"setsockopt(IP_PKTINFO)", Close(), return false);
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#endif // __FreeBSD__
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// Tweak receive buffer size if requested
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if (rcvBufSizeM > 0) {
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ERROR_IF_FUNC(setsockopt(socketDescM, SOL_SOCKET, SO_RCVBUF, &rcvBufSizeM, sizeof(rcvBufSizeM)) < 0,
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"setsockopt(SO_RCVBUF)", Close(), return false);
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}
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// Bind socket
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memset(&sockAddrM, 0, sizeof(sockAddrM));
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sockAddrM.sin_family = AF_INET;
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sockAddrM.sin_port = htons((uint16_t)(portP & 0xFFFF));
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sockAddrM.sin_addr.s_addr = htonl(INADDR_ANY);
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ERROR_IF_FUNC(bind(socketDescM, (struct sockaddr *)&sockAddrM, sizeof(sockAddrM)) < 0,
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"bind()", Close(), return false);
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// Update socket port
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ERROR_IF_FUNC(getsockname(socketDescM, (struct sockaddr*)&sockAddrM, &len) < 0,
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"getsockname()", Close(), return false);
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socketPortM = ntohs(sockAddrM.sin_port);
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isMulticastM = false;
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}
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debug1("%s (%d) socketPort=%d", __PRETTY_FUNCTION__, portP, socketPortM);
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return true;
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}
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bool cSatipSocket::OpenMulticast(const int portP, const char *streamAddrP, const char *sourceAddrP)
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{
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debug1("%s (%d, %s, %s)", __PRETTY_FUNCTION__, portP, streamAddrP, sourceAddrP);
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if (Open(portP)) {
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CheckAddress(streamAddrP, &streamAddrM);
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if (!isempty(sourceAddrP))
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useSsmM = CheckAddress(sourceAddrP, &sourceAddrM);
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return Join();
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}
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return false;
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}
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void cSatipSocket::Close(void)
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{
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debug1("%s socketPort=%d", __PRETTY_FUNCTION__, socketPortM);
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// Check if socket exists
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if (socketDescM >= 0) {
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Leave();
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close(socketDescM);
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socketDescM = -1;
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socketPortM = 0;
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memset(&sockAddrM, 0, sizeof(sockAddrM));
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streamAddrM = htonl(INADDR_ANY);
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sourceAddrM = htonl(INADDR_ANY);
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isMulticastM = false;
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useSsmM = false;
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}
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}
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bool cSatipSocket::Flush(void)
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{
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debug1("%s", __PRETTY_FUNCTION__);
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if (socketDescM < 0) {
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const unsigned int len = 65535;
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unsigned char *buf = MALLOC(unsigned char, len);
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if (buf) {
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int i = 0;
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do {
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// Sanity check
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if (++i > 10)
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break;
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} while (Read(buf, len));
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return true;
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}
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}
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return false;
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}
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bool cSatipSocket::CheckAddress(const char *addrP, in_addr_t *inAddrP)
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{
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if (inAddrP) {
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// First try only the IP address
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*inAddrP = inet_addr(addrP);
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if (*inAddrP == htonl(INADDR_NONE)) {
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debug1("%s (%s, ) Cannot convert to address", __PRETTY_FUNCTION__, addrP);
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// It may be a host name, get the name
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struct hostent *host = gethostbyname(addrP);
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if (!host) {
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char tmp[64];
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error("gethostbyname() failed: %s is not valid address: %s", addrP,
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strerror_r(h_errno, tmp, sizeof(tmp)));
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return false;
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}
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*inAddrP = inet_addr(*host->h_addr_list);
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}
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return true;
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}
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return false;
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}
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bool cSatipSocket::Join(void)
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{
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debug1("%s", __PRETTY_FUNCTION__);
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// Check if socket exists
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if (socketDescM >= 0 && !isMulticastM) {
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// Join a new multicast group
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if (useSsmM) {
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// Source-specific multicast (SSM) is used
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struct group_source_req gsr;
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struct sockaddr_in *grp;
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struct sockaddr_in *src;
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gsr.gsr_interface = 0; // if_nametoindex("any") ?
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grp = (struct sockaddr_in*)&gsr.gsr_group;
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grp->sin_family = AF_INET;
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grp->sin_addr.s_addr = streamAddrM;
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grp->sin_port = 0;
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src = (struct sockaddr_in*)&gsr.gsr_source;
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src->sin_family = AF_INET;
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src->sin_addr.s_addr = sourceAddrM;
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src->sin_port = 0;
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ERROR_IF_RET(setsockopt(socketDescM, SOL_IP, MCAST_JOIN_SOURCE_GROUP, &gsr, sizeof(gsr)) < 0, "setsockopt(MCAST_JOIN_SOURCE_GROUP)", return false);
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}
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else {
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struct ip_mreq mreq;
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mreq.imr_multiaddr.s_addr = streamAddrM;
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mreq.imr_interface.s_addr = htonl(INADDR_ANY);
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ERROR_IF_RET(setsockopt(socketDescM, SOL_IP, IP_ADD_MEMBERSHIP, &mreq, sizeof(mreq)) < 0, "setsockopt(IP_ADD_MEMBERSHIP)", return false);
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}
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// Update multicasting flag
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isMulticastM = true;
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}
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return true;
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}
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bool cSatipSocket::Leave(void)
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{
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debug1("%s", __PRETTY_FUNCTION__);
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// Check if socket exists
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if (socketDescM >= 0 && isMulticastM) {
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// Leave the existing multicast group
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if (useSsmM) {
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// Source-specific multicast (SSM) is used
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struct group_source_req gsr;
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struct sockaddr_in *grp;
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struct sockaddr_in *src;
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gsr.gsr_interface = 0; // if_nametoindex("any") ?
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grp = (struct sockaddr_in*)&gsr.gsr_group;
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grp->sin_family = AF_INET;
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grp->sin_addr.s_addr = streamAddrM;
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grp->sin_port = 0;
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src = (struct sockaddr_in*)&gsr.gsr_source;
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src->sin_family = AF_INET;
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src->sin_addr.s_addr = sourceAddrM;
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src->sin_port = 0;
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ERROR_IF_RET(setsockopt(socketDescM, SOL_IP, MCAST_LEAVE_SOURCE_GROUP, &gsr, sizeof(gsr)) < 0, "setsockopt(MCAST_LEAVE_SOURCE_GROUP)", return false);
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}
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else {
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struct ip_mreq mreq;
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mreq.imr_multiaddr.s_addr = streamAddrM;
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mreq.imr_interface.s_addr = htonl(INADDR_ANY);
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ERROR_IF_RET(setsockopt(socketDescM, SOL_IP, IP_DROP_MEMBERSHIP, &mreq, sizeof(mreq)) < 0, "setsockopt(IP_DROP_MEMBERSHIP)", return false);
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}
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// Update multicasting flag
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isMulticastM = false;
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}
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return true;
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}
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int cSatipSocket::Read(unsigned char *bufferAddrP, unsigned int bufferLenP)
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{
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debug16("%s (, %d)", __PRETTY_FUNCTION__, bufferLenP);
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// Error out if socket not initialized
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if (socketDescM <= 0) {
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error("%s Invalid socket", __PRETTY_FUNCTION__);
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return -1;
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}
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int len = 0;
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// Read data from socket in a loop
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do {
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socklen_t addrlen = sizeof(sockAddrM);
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struct msghdr msgh;
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struct iovec iov;
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char cbuf[256];
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len = 0;
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// Initialize iov and msgh structures
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memset(&msgh, 0, sizeof(struct msghdr));
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iov.iov_base = bufferAddrP;
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iov.iov_len = bufferLenP;
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msgh.msg_control = cbuf;
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msgh.msg_controllen = sizeof(cbuf);
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msgh.msg_name = &sockAddrM;
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msgh.msg_namelen = addrlen;
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msgh.msg_iov = &iov;
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msgh.msg_iovlen = 1;
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msgh.msg_flags = 0;
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if (socketDescM && bufferAddrP && (bufferLenP > 0))
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len = (int)recvmsg(socketDescM, &msgh, MSG_DONTWAIT);
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if (len > 0) {
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#ifndef __FreeBSD__
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if (isMulticastM) {
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// Process auxiliary received data and validate source address
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for (struct cmsghdr *cmsg = CMSG_FIRSTHDR(&msgh); cmsg != NULL; cmsg = CMSG_NXTHDR(&msgh, cmsg)) {
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if ((cmsg->cmsg_level == SOL_IP) && (cmsg->cmsg_type == IP_PKTINFO)) {
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struct in_pktinfo *i = (struct in_pktinfo *)CMSG_DATA(cmsg);
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if ((i->ipi_addr.s_addr == streamAddrM) || (htonl(INADDR_ANY) == streamAddrM))
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return len;
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}
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}
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}
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else
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#endif // __FreeBSD__
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return len;
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}
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} while (len > 0);
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ERROR_IF_RET(len < 0 && errno != EAGAIN && errno != EWOULDBLOCK, "recvmsg()", return -1);
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return 0;
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}
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int cSatipSocket::ReadMulti(unsigned char *bufferAddrP, unsigned int *elementRecvSizeP, unsigned int elementCountP, unsigned int elementBufferSizeP)
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{
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debug16("%s (, , %d, %d)", __PRETTY_FUNCTION__, elementCountP, elementBufferSizeP);
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int count = -1;
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// Error out if socket not initialized
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if (socketDescM <= 0) {
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error("%s Invalid socket", __PRETTY_FUNCTION__);
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return -1;
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}
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if (!bufferAddrP || !elementRecvSizeP || !elementCountP || !elementBufferSizeP) {
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error("%s Invalid parameter(s)", __PRETTY_FUNCTION__);
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return -1;
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}
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#ifndef __SATIP_DISABLE_RECVMMSG__
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// Initialize iov and msgh structures
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struct mmsghdr mmsgh[elementCountP];
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struct iovec iov[elementCountP];
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memset(mmsgh, 0, sizeof(mmsgh[0]) * elementCountP);
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for (unsigned int i = 0; i < elementCountP; ++i) {
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iov[i].iov_base = bufferAddrP + i * elementBufferSizeP;
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iov[i].iov_len = elementBufferSizeP;
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mmsgh[i].msg_hdr.msg_iov = &iov[i];
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mmsgh[i].msg_hdr.msg_iovlen = 1;
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}
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// Read data from socket as a set
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count = (int)recvmmsg(socketDescM, mmsgh, elementCountP, MSG_DONTWAIT, NULL);
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ERROR_IF_RET(count < 0 && errno != EAGAIN && errno != EWOULDBLOCK, "recvmmsg()", return -1);
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for (int i = 0; i < count; ++i)
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elementRecvSizeP[i] = mmsgh[i].msg_len;
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#else
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count = 0;
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while (count < (int)elementCountP) {
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int len = Read(bufferAddrP + count * elementBufferSizeP, elementBufferSizeP);
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if (len < 0)
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return -1;
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else if (len == 0)
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break;
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elementRecvSizeP[count++] = len;
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}
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#endif
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debug16("%s Received %d packets size[0]=%d", __PRETTY_FUNCTION__, count, elementRecvSizeP[0]);
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return count;
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}
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bool cSatipSocket::Write(const char *addrP, const unsigned char *bufferAddrP, unsigned int bufferLenP)
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{
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debug1("%s (%s, , %d)", __PRETTY_FUNCTION__, addrP, bufferLenP);
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// Error out if socket not initialized
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if (socketDescM <= 0) {
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error("%s Invalid socket", __PRETTY_FUNCTION__);
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return false;
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}
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struct sockaddr_in sockAddr;
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memset(&sockAddr, 0, sizeof(sockAddr));
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sockAddr.sin_family = AF_INET;
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sockAddr.sin_port = htons((uint16_t)(socketPortM & 0xFFFF));
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sockAddr.sin_addr.s_addr = inet_addr(addrP);
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ERROR_IF_RET(sendto(socketDescM, bufferAddrP, bufferLenP, 0, (struct sockaddr *)&sockAddr, sizeof(sockAddr)) < 0, "sendto()", return false);
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return true;
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}
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