mirror of
https://github.com/rsyslog/rsyslog.git
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refactor create_udp_socket
Function used very old style and was hard to read. Now also supports strucutred handling of exceptions. see also https://github.com/rsyslog/rsyslog/pull/2049 see also https://github.com/rsyslog/rsyslog/issues/2040
This commit is contained in:
Rainer Gerhards
parent
08f2d10caa
commit
ee1499f462
427
runtime/net.c
427
runtime/net.c
@ -1252,6 +1252,206 @@ closeUDPListenSockets(int *pSockArr)
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}
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/* create a single UDP socket and bail out if an error occurs.
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* This is called from a loop inside create_udp_socket which
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* iterates through potentially multiple sockets. NOT to be
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* used elsewhere.
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*/
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static rsRetVal ATTR_NONNULL(1, 2)
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create_single_udp_socket(int *const s, /* socket */
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struct addrinfo *const r,
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const uchar *const hostname,
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const int bIsServer,
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const int rcvbuf,
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const int sndbuf,
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const int ipfreebind,
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const char *const device
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)
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{
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const int on = 1;
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int sockflags;
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int actrcvbuf;
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int actsndbuf;
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socklen_t optlen;
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char errStr[1024];
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DEFiRet;
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assert(r != NULL); // does NOT work with -O2 or higher due to ATTR_NONNULL!
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assert(s != NULL);
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# if defined (_AIX)
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/* AIXPORT : socktype will be SOCK_DGRAM, as set in hints before */
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*s = socket(r->ai_family, SOCK_DGRAM, r->ai_protocol);
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# else
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*s = socket(r->ai_family, r->ai_socktype, r->ai_protocol);
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# endif
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if (*s < 0) {
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if(!(r->ai_family == PF_INET6 && errno == EAFNOSUPPORT)) {
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errmsg.LogError(errno, NO_ERRCODE, "create_udp_socket(), socket");
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/* it is debateble if PF_INET with EAFNOSUPPORT should
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* also be ignored...
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*/
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}
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ABORT_FINALIZE(RS_RET_ERR);
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}
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# ifdef IPV6_V6ONLY
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if (r->ai_family == AF_INET6) {
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int ion = 1;
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if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY,
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(char *)&ion, sizeof (ion)) < 0) {
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errmsg.LogError(errno, RS_RET_ERR, "error creating UDP socket - setsockopt");
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ABORT_FINALIZE(RS_RET_ERR);
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}
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}
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# endif
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if(device) {
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# if defined(SO_BINDTODEVICE)
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if(setsockopt(*s, SOL_SOCKET, SO_BINDTODEVICE, device, strlen(device) + 1) < 0)
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# endif
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{
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errmsg.LogError(errno, RS_RET_ERR, "create UDP socket bound to device failed");
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ABORT_FINALIZE(RS_RET_ERR);
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}
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}
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if(setsockopt(*s, SOL_SOCKET, SO_REUSEADDR, (char *) &on, sizeof(on)) < 0 ) {
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errmsg.LogError(errno, RS_RET_ERR, "create UDP socket failed to set REUSEADDR");
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ABORT_FINALIZE(RS_RET_ERR);
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}
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/* We need to enable BSD compatibility. Otherwise an attacker
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* could flood our log files by sending us tons of ICMP errors.
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*/
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/* AIXPORT : SO_BSDCOMPAT socket option is depricated, and its usage
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* has been discontinued on most unixes, AIX does not support this option,
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* hence avoid the call.
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*/
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# if !defined(OS_BSD) && !defined(__hpux) && !defined(_AIX)
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if (should_use_so_bsdcompat()) {
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if (setsockopt(*s, SOL_SOCKET, SO_BSDCOMPAT, (char *) &on, sizeof(on)) < 0) {
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errmsg.LogError(errno, RS_RET_ERR, "create UDP socket failed to set BSDCOMPAT");
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ABORT_FINALIZE(RS_RET_ERR);
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}
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}
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# endif
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if(bIsServer) {
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DBGPRINTF("net.c: trying to set server socket %d to non-blocking mode\n", *s);
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if ((sockflags = fcntl(*s, F_GETFL)) != -1) {
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sockflags |= O_NONBLOCK;
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/* SETFL could fail too, so get it caught by the subsequent
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* error check.
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*/
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sockflags = fcntl(*s, F_SETFL, sockflags);
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}
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if (sockflags == -1) {
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LogError(errno, RS_RET_ERR, "net.c: socket %d fcntl(O_NONBLOCK)", *s);
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ABORT_FINALIZE(RS_RET_ERR);
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}
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}
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if(sndbuf != 0) {
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# if defined(SO_SNDBUFFORCE)
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if(setsockopt(*s, SOL_SOCKET, SO_SNDBUFFORCE, &sndbuf, sizeof(sndbuf)) < 0)
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# endif
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{
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/* if we fail, try to do it the regular way. Experiments show that at
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* least some platforms do not return an error here, but silently set
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* it to the max permitted value. So we do our error check a bit
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* differently by querying the size below.
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*/
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if(setsockopt(*s, SOL_SOCKET, SO_SNDBUF, &sndbuf, sizeof(sndbuf)) != 0) {
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/* keep Coverity happy */
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DBGPRINTF("setsockopt in %s:%d failed - this is expected and "
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"handled at later stages\n", __FILE__, __LINE__);
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}
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}
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/* report socket buffer sizes */
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optlen = sizeof(actsndbuf);
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if(getsockopt(*s, SOL_SOCKET, SO_SNDBUF, &actsndbuf, &optlen) == 0) {
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LogMsg(0, NO_ERRCODE, LOG_INFO,
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"socket %d, actual os socket sndbuf size is %d", *s, actsndbuf);
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if(sndbuf != 0 && actsndbuf/2 != sndbuf) {
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errmsg.LogError(errno, NO_ERRCODE,
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"could not set os socket sndbuf size %d for socket %d, "
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"value now is %d", sndbuf, *s, actsndbuf/2);
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}
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} else {
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DBGPRINTF("could not obtain os socket rcvbuf size for socket %d: %s\n",
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*s, rs_strerror_r(errno, errStr, sizeof(errStr)));
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}
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}
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if(rcvbuf != 0) {
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# if defined(SO_RCVBUFFORCE)
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if(setsockopt(*s, SOL_SOCKET, SO_RCVBUFFORCE, &rcvbuf, sizeof(rcvbuf)) < 0)
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# endif
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{
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/* if we fail, try to do it the regular way. Experiments show that at
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* least some platforms do not return an error here, but silently set
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* it to the max permitted value. So we do our error check a bit
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* differently by querying the size below.
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*/
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if(setsockopt(*s, SOL_SOCKET, SO_RCVBUF, &rcvbuf, sizeof(rcvbuf)) != 0) {
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/* keep Coverity happy */
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DBGPRINTF("setsockopt in %s:%d failed - this is expected and "
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"handled at later stages\n", __FILE__, __LINE__);
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}
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}
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optlen = sizeof(actrcvbuf);
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if(getsockopt(*s, SOL_SOCKET, SO_RCVBUF, &actrcvbuf, &optlen) == 0) {
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LogMsg(0, NO_ERRCODE, LOG_INFO,
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"socket %d, actual os socket rcvbuf size %d\n", *s, actrcvbuf);
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if(rcvbuf != 0 && actrcvbuf/2 != rcvbuf) {
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errmsg.LogError(errno, NO_ERRCODE,
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"cannot set os socket rcvbuf size %d for socket %d, value now is %d",
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rcvbuf, *s, actrcvbuf/2);
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}
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} else {
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DBGPRINTF("could not obtain os socket rcvbuf size for socket %d: %s\n",
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*s, rs_strerror_r(errno, errStr, sizeof(errStr)));
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}
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}
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if(bIsServer) {
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/* rgerhards, 2007-06-22: if we run on a kernel that does not support
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* the IPV6_V6ONLY socket option, we need to use a work-around. On such
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* systems the IPv6 socket does also accept IPv4 sockets. So an IPv4
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* socket can not listen on the same port as an IPv6 socket. The only
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* workaround is to ignore the "socket in use" error. This is what we
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* do if we have to.
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*/
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if( (bind(*s, r->ai_addr, r->ai_addrlen) < 0)
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# ifndef IPV6_V6ONLY
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&& (errno != EADDRINUSE)
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# endif
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) {
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if (errno == EADDRNOTAVAIL && ipfreebind != IPFREEBIND_DISABLED) {
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if (setsockopt(*s, IPPROTO_IP, IP_FREEBIND, &on, sizeof(on)) < 0) {
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errmsg.LogError(errno, RS_RET_ERR, "setsockopt(IP_FREEBIND)");
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} else if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) {
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errmsg.LogError(errno, RS_RET_ERR, "bind with IP_FREEBIND");
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} else {
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if (ipfreebind >= IPFREEBIND_ENABLED_WITH_LOG)
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errmsg.LogMsg(0, RS_RET_OK_WARN, LOG_WARNING,
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"bound address %s IP free", hostname);
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//FINALIZE; TODO: activate this (issue 2040) BUT ensure first
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// that the option is actually configurable
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}
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}
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ABORT_FINALIZE(RS_RET_ERR);
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}
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}
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finalize_it:
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if(iRet != RS_RET_OK) {
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close(*s);
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*s = -1;
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}
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RETiRet;
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}
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/* creates the UDP listen sockets
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* hostname and/or pszPort may be NULL, but not both!
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* bIsServer indicates if a server socket should be created
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@ -1264,21 +1464,17 @@ closeUDPListenSockets(int *pSockArr)
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static int *
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create_udp_socket(uchar *hostname,
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uchar *pszPort,
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int bIsServer,
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int rcvbuf,
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const int bIsServer,
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const int rcvbuf,
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const int sndbuf,
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int ipfreebind,
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const int ipfreebind,
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char *device)
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{
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struct addrinfo hints, *res, *r;
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int error, maxs, *s, *socks, on = 1;
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int sockflags;
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int actrcvbuf;
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int actsndbuf;
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socklen_t optlen;
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char errStr[1024];
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int error, maxs, *s, *socks;
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rsRetVal localRet;
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assert(!((pszPort == NULL) && (hostname == NULL)));
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assert(!((pszPort == NULL) && (hostname == NULL))); /* one of them must be non-NULL */
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memset(&hints, 0, sizeof(hints));
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if(bIsServer)
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hints.ai_flags = AI_PASSIVE | AI_NUMERICSERV;
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@ -1286,12 +1482,12 @@ create_udp_socket(uchar *hostname,
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hints.ai_flags = AI_NUMERICSERV;
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hints.ai_family = glbl.GetDefPFFamily();
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hints.ai_socktype = SOCK_DGRAM;
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#if defined (_AIX)
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/* AIXPORT : SOCK_DGRAM has the protocol IPPROTO_UDP
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* getaddrinfo needs this hint on AIX
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*/
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# if defined (_AIX)
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/* AIXPORT : SOCK_DGRAM has the protocol IPPROTO_UDP
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* getaddrinfo needs this hint on AIX
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*/
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hints.ai_protocol = IPPROTO_UDP;
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#endif
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# endif
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error = getaddrinfo((char*) hostname, (char*) pszPort, &hints, &res);
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if(error) {
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errmsg.LogError(0, NO_ERRCODE, "%s", gai_strerror(error));
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@ -1304,202 +1500,21 @@ create_udp_socket(uchar *hostname,
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/* EMPTY */;
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socks = MALLOC((maxs+1) * sizeof(int));
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if (socks == NULL) {
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errmsg.LogError(0, NO_ERRCODE, "couldn't allocate memory for UDP sockets, suspending UDP "
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"message reception");
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freeaddrinfo(res);
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return NULL;
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errmsg.LogError(0, RS_RET_OUT_OF_MEMORY, "couldn't allocate memory for UDP "
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"sockets, suspending UDP message reception");
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freeaddrinfo(res);
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return NULL;
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}
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*socks = 0; /* num of sockets counter at start of array */
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s = socks + 1;
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for (r = res; r != NULL ; r = r->ai_next) {
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#if defined (_AIX)
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/* AIXPORT : socktype will be SOCK_DGRAM, as set in hints above */
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*s = socket(r->ai_family, SOCK_DGRAM, r->ai_protocol);
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#else
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*s = socket(r->ai_family, r->ai_socktype, r->ai_protocol);
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#endif
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if (*s < 0) {
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if(!(r->ai_family == PF_INET6 && errno == EAFNOSUPPORT))
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errmsg.LogError(errno, NO_ERRCODE, "create_udp_socket(), socket");
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/* it is debateble if PF_INET with EAFNOSUPPORT should
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* also be ignored...
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*/
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continue;
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}
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# ifdef IPV6_V6ONLY
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if (r->ai_family == AF_INET6) {
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int ion = 1;
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if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY,
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(char *)&ion, sizeof (ion)) < 0) {
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errmsg.LogError(errno, NO_ERRCODE, "setsockopt");
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close(*s);
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*s = -1;
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continue;
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}
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}
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# endif
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if(device) {
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# if defined(SO_BINDTODEVICE)
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if(setsockopt(*s, SOL_SOCKET, SO_BINDTODEVICE, device, strlen(device) + 1) < 0)
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# endif
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{
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errmsg.LogError(errno, NO_ERRCODE, "setsockopt(SO_BINDTODEVICE)");
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close(*s);
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*s = -1;
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continue;
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}
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localRet = create_single_udp_socket(s, r, hostname, bIsServer, rcvbuf,
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sndbuf, ipfreebind, device);
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if(localRet == RS_RET_OK) {
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(*socks)++;
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s++;
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}
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/* if we have an error, we "just" suspend that socket. Eventually
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* other sockets will work. At the end of this function, we check
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* if we managed to open at least one socket. If not, we'll write
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* a "inet suspended" message and declare failure. Else we use
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* what we could obtain.
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* rgerhards, 2007-06-22
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*/
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if (setsockopt(*s, SOL_SOCKET, SO_REUSEADDR,
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(char *) &on, sizeof(on)) < 0 ) {
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errmsg.LogError(errno, NO_ERRCODE, "setsockopt(REUSEADDR)");
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close(*s);
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*s = -1;
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continue;
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}
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/* We need to enable BSD compatibility. Otherwise an attacker
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* could flood our log files by sending us tons of ICMP errors.
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*/
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/* AIXPORT : SO_BSDCOMPAT socket option is depricated , and its usage has been discontinued
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on most unixes, AIX does not support this option , hence avoid the call.
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*/
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#if !defined(OS_BSD) && !defined(__hpux) && !defined(_AIX)
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if (should_use_so_bsdcompat()) {
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if (setsockopt(*s, SOL_SOCKET, SO_BSDCOMPAT,
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(char *) &on, sizeof(on)) < 0) {
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errmsg.LogError(errno, NO_ERRCODE, "setsockopt(BSDCOMPAT)");
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close(*s);
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*s = -1;
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continue;
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}
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}
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#endif
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if(bIsServer) {
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DBGPRINTF("net.c: trying to set server socket %d to non-blocking mode\n", *s);
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if ((sockflags = fcntl(*s, F_GETFL)) != -1) {
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sockflags |= O_NONBLOCK;
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/* SETFL could fail too, so get it caught by the subsequent
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* error check.
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*/
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sockflags = fcntl(*s, F_SETFL, sockflags);
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}
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if (sockflags == -1) {
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LogError(errno, NO_ERRCODE, "net.c: socket %d fcntl(O_NONBLOCK)", *s);
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close(*s);
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*s = -1;
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continue;
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}
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}
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if(sndbuf != 0) {
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# if defined(SO_SNDBUFFORCE)
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if(setsockopt(*s, SOL_SOCKET, SO_SNDBUFFORCE, &sndbuf, sizeof(sndbuf)) < 0)
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# endif
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{
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/* if we fail, try to do it the regular way. Experiments show that at
|
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* least some platforms do not return an error here, but silently set
|
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* it to the max permitted value. So we do our error check a bit
|
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* differently by querying the size below.
|
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*/
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if(setsockopt(*s, SOL_SOCKET, SO_SNDBUF, &sndbuf, sizeof(sndbuf)) != 0) {
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/* keep Coverity happy */
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DBGPRINTF("setsockopt in %s:%d failed - this is expected and "
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"handled at later stages\n", __FILE__, __LINE__);
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}
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}
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/* report socket buffer sizes */
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optlen = sizeof(actsndbuf);
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if(getsockopt(*s, SOL_SOCKET, SO_SNDBUF, &actsndbuf, &optlen) == 0) {
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LogMsg(0, NO_ERRCODE, LOG_INFO,
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"socket %d, actual os socket sndbuf size is %d", *s, actsndbuf);
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if(sndbuf != 0 && actsndbuf/2 != sndbuf) {
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errmsg.LogError(errno, NO_ERRCODE,
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"could not set os socket sndbuf size %d for socket %d, "
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"value now is %d", sndbuf, *s, actsndbuf/2);
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}
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} else {
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DBGPRINTF("could not obtain os socket rcvbuf size for socket %d: %s\n",
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*s, rs_strerror_r(errno, errStr, sizeof(errStr)));
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}
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}
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if(rcvbuf != 0) {
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# if defined(SO_RCVBUFFORCE)
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if(setsockopt(*s, SOL_SOCKET, SO_RCVBUFFORCE, &rcvbuf, sizeof(rcvbuf)) < 0)
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# endif
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{
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/* if we fail, try to do it the regular way. Experiments show that at
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* least some platforms do not return an error here, but silently set
|
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* it to the max permitted value. So we do our error check a bit
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* differently by querying the size below.
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*/
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if(setsockopt(*s, SOL_SOCKET, SO_RCVBUF, &rcvbuf, sizeof(rcvbuf)) != 0) {
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/* keep Coverity happy */
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DBGPRINTF("setsockopt in %s:%d failed - this is expected and "
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"handled at later stages\n", __FILE__, __LINE__);
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}
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}
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optlen = sizeof(actrcvbuf);
|
||||
if(getsockopt(*s, SOL_SOCKET, SO_RCVBUF, &actrcvbuf, &optlen) == 0) {
|
||||
LogMsg(0, NO_ERRCODE, LOG_INFO,
|
||||
"socket %d, actual os socket rcvbuf size %d\n", *s, actrcvbuf);
|
||||
if(rcvbuf != 0 && actrcvbuf/2 != rcvbuf) {
|
||||
errmsg.LogError(errno, NO_ERRCODE,
|
||||
"cannot set os socket rcvbuf size %d for socket %d, value now is %d",
|
||||
rcvbuf, *s, actrcvbuf/2);
|
||||
}
|
||||
} else {
|
||||
DBGPRINTF("could not obtain os socket rcvbuf size for socket %d: %s\n",
|
||||
*s, rs_strerror_r(errno, errStr, sizeof(errStr)));
|
||||
}
|
||||
}
|
||||
|
||||
if(bIsServer) {
|
||||
|
||||
/* rgerhards, 2007-06-22: if we run on a kernel that does not support
|
||||
* the IPV6_V6ONLY socket option, we need to use a work-around. On such
|
||||
* systems the IPv6 socket does also accept IPv4 sockets. So an IPv4
|
||||
* socket can not listen on the same port as an IPv6 socket. The only
|
||||
* workaround is to ignore the "socket in use" error. This is what we
|
||||
* do if we have to.
|
||||
*/
|
||||
if( (bind(*s, r->ai_addr, r->ai_addrlen) < 0)
|
||||
# ifndef IPV6_V6ONLY
|
||||
&& (errno != EADDRINUSE)
|
||||
# endif
|
||||
) {
|
||||
if (errno == EADDRNOTAVAIL && ipfreebind != IPFREEBIND_DISABLED) {
|
||||
if (setsockopt(*s, IPPROTO_IP, IP_FREEBIND, &on, sizeof(on)) < 0) {
|
||||
errmsg.LogError(errno, NO_ERRCODE, "setsockopt(IP_FREEBIND)");
|
||||
}
|
||||
else if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) {
|
||||
errmsg.LogError(errno, NO_ERRCODE, "bind with IP_FREEBIND");
|
||||
} else {
|
||||
if (ipfreebind >= IPFREEBIND_ENABLED_WITH_LOG)
|
||||
errmsg.LogMsg(0, RS_RET_OK_WARN, LOG_WARNING,
|
||||
"bound address %s IP free", hostname);
|
||||
continue;
|
||||
}
|
||||
}
|
||||
close(*s);
|
||||
*s = -1;
|
||||
continue;
|
||||
}
|
||||
}
|
||||
|
||||
(*socks)++;
|
||||
s++;
|
||||
}
|
||||
|
||||
if(res != NULL)
|
||||
@ -1512,7 +1527,7 @@ create_udp_socket(uchar *hostname,
|
||||
if(*socks == 0) {
|
||||
errmsg.LogError(0, NO_ERRCODE, "No UDP socket could successfully be initialized, "
|
||||
"some functionality may be disabled.\n");
|
||||
/* we do NOT need to free any sockets, because there were none... */
|
||||
/* we do NOT need to close any sockets, because there were none... */
|
||||
free(socks);
|
||||
return(NULL);
|
||||
}
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user