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socat/xio-socket.c

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socat V1.6.0.0 (initial GIT commit)
2008-01-27 07:00:08 -05:00
/* $Id: xio-socket.c,v 1.45 2007/03/06 21:12:09 gerhard Exp $ */
/* Copyright Gerhard Rieger 2001-2007 */
/* Published under the GNU General Public License V.2, see file COPYING */
/* this file contains the source for socket related functions */
#include "xiosysincludes.h"
#if _WITH_SOCKET
#include "xioopen.h"
#include "xio-socket.h"
#include "xio-named.h"
#if WITH_IP4
#include "xio-ip4.h"
#endif /* WITH_IP4 */
#if WITH_IP6
#include "xio-ip6.h"
#endif /* WITH_IP6 */
#include "xio-ip.h"
#include "xio-ipapp.h" /*! not clean */
#include "xio-tcpwrap.h"
const struct optdesc opt_so_debug = { "so-debug", "debug", OPT_SO_DEBUG, GROUP_SOCKET, PH_PASTSOCKET, TYPE_INT, OFUNC_SOCKOPT, SOL_SOCKET, SO_DEBUG };
#ifdef SO_ACCEPTCONN /* AIX433 */
const struct optdesc opt_so_acceptconn={ "so-acceptconn","acceptconn",OPT_SO_ACCEPTCONN,GROUP_SOCKET,PH_PASTSOCKET,TYPE_INT, OFUNC_SOCKOPT, SOL_SOCKET, SO_ACCEPTCONN};
#endif /* SO_ACCEPTCONN */
const struct optdesc opt_so_broadcast= { "so-broadcast", "broadcast", OPT_SO_BROADCAST,GROUP_SOCKET, PH_PASTSOCKET, TYPE_INT, OFUNC_SOCKOPT, SOL_SOCKET, SO_BROADCAST};
const struct optdesc opt_so_reuseaddr= { "so-reuseaddr", "reuseaddr", OPT_SO_REUSEADDR,GROUP_SOCKET, PH_PASTSOCKET, TYPE_INT, OFUNC_SOCKOPT, SOL_SOCKET, SO_REUSEADDR};
const struct optdesc opt_so_keepalive= { "so-keepalive", "keepalive", OPT_SO_KEEPALIVE,GROUP_SOCKET, PH_FD, TYPE_INT, OFUNC_SOCKOPT, SOL_SOCKET, SO_KEEPALIVE};
#if HAVE_STRUCT_LINGER
const struct optdesc opt_so_linger = { "so-linger", "linger", OPT_SO_LINGER, GROUP_SOCKET, PH_PASTSOCKET, TYPE_LINGER,OFUNC_SOCKOPT,SOL_SOCKET, SO_LINGER };
#else /* !HAVE_STRUCT_LINGER */
const struct optdesc opt_so_linger = { "so-linger", "linger", OPT_SO_LINGER, GROUP_SOCKET, PH_PASTSOCKET, TYPE_INT, OFUNC_SOCKOPT, SOL_SOCKET, SO_LINGER };
#endif /* !HAVE_STRUCT_LINGER */
const struct optdesc opt_so_oobinline= { "so-oobinline", "oobinline", OPT_SO_OOBINLINE,GROUP_SOCKET, PH_PASTSOCKET, TYPE_INT, OFUNC_SOCKOPT, SOL_SOCKET, SO_OOBINLINE};
const struct optdesc opt_so_sndbuf = { "so-sndbuf", "sndbuf", OPT_SO_SNDBUF, GROUP_SOCKET, PH_PASTSOCKET, TYPE_INT, OFUNC_SOCKOPT, SOL_SOCKET, SO_SNDBUF};
const struct optdesc opt_so_sndbuf_late={ "so-sndbuf-late","sndbuf-late",OPT_SO_SNDBUF_LATE,GROUP_SOCKET,PH_LATE,TYPE_INT,OFUNC_SOCKOPT,SOL_SOCKET,SO_SNDBUF };
const struct optdesc opt_so_rcvbuf = { "so-rcvbuf", "rcvbuf", OPT_SO_RCVBUF, GROUP_SOCKET, PH_PASTSOCKET, TYPE_INT, OFUNC_SOCKOPT, SOL_SOCKET, SO_RCVBUF};
const struct optdesc opt_so_rcvbuf_late={"so-rcvbuf-late","rcvbuf-late",OPT_SO_RCVBUF_LATE,GROUP_SOCKET,PH_LATE,TYPE_INT,OFUNC_SOCKOPT,SOL_SOCKET,SO_RCVBUF };
const struct optdesc opt_so_error = { "so-error", "error", OPT_SO_ERROR, GROUP_SOCKET, PH_PASTSOCKET, TYPE_INT, OFUNC_SOCKOPT, SOL_SOCKET, SO_ERROR};
const struct optdesc opt_so_type = { "so-type", "type", OPT_SO_TYPE, GROUP_SOCKET, PH_PASTSOCKET, TYPE_INT, OFUNC_SOCKOPT, SOL_SOCKET, SO_TYPE };
const struct optdesc opt_so_dontroute= { "so-dontroute", "dontroute", OPT_SO_DONTROUTE,GROUP_SOCKET, PH_PASTSOCKET, TYPE_INT, OFUNC_SOCKOPT, SOL_SOCKET, SO_DONTROUTE };
#ifdef SO_RCVLOWAT
const struct optdesc opt_so_rcvlowat = { "so-rcvlowat", "rcvlowat", OPT_SO_RCVLOWAT, GROUP_SOCKET, PH_PASTSOCKET, TYPE_INT, OFUNC_SOCKOPT, SOL_SOCKET, SO_RCVLOWAT };
#endif
#ifdef SO_RCVTIMEO
const struct optdesc opt_so_rcvtimeo = { "so-rcvtimeo", "rcvtimeo", OPT_SO_RCVTIMEO, GROUP_SOCKET, PH_PASTSOCKET, TYPE_TIMEVAL,OFUNC_SOCKOPT,SOL_SOCKET,SO_RCVTIMEO };
#endif
#ifdef SO_SNDLOWAT
const struct optdesc opt_so_sndlowat = { "so-sndlowat", "sndlowat", OPT_SO_SNDLOWAT, GROUP_SOCKET, PH_PASTSOCKET, TYPE_INT, OFUNC_SOCKOPT, SOL_SOCKET, SO_SNDLOWAT };
#endif
#ifdef SO_SNDTIMEO
const struct optdesc opt_so_sndtimeo = { "so-sndtimeo", "sndtimeo", OPT_SO_SNDTIMEO, GROUP_SOCKET, PH_PASTSOCKET, TYPE_TIMEVAL,OFUNC_SOCKOPT,SOL_SOCKET,SO_SNDTIMEO };
#endif
/* end of setsockopt options of UNIX98 standard */
#ifdef SO_AUDIT /* AIX 4.3.3 */
const struct optdesc opt_so_audit = { "so-audit", "audit", OPT_SO_AUDIT, GROUP_SOCKET, PH_PASTSOCKET, TYPE_INT, OFUNC_SOCKOPT, SOL_SOCKET, SO_AUDIT };
#endif /* SO_AUDIT */
#ifdef SO_ATTACH_FILTER
const struct optdesc opt_so_attach_filter={"so-attach-filter","attachfilter",OPT_SO_ATTACH_FILTER,GROUP_SOCKET,PH_PASTSOCKET,TYPE_INT,OFUNC_SOCKOPT,SOL_SOCKET,SO_ATTACH_FILTER};
#endif
#ifdef SO_DETACH_FILTER
const struct optdesc opt_so_detach_filter={"so-detach-filter","detachfilter",OPT_SO_DETACH_FILTER,GROUP_SOCKET,PH_PASTSOCKET,TYPE_INT,OFUNC_SOCKOPT,SOL_SOCKET,SO_DETACH_FILTER};
#endif
#ifdef SO_BINDTODEVICE /* Linux: man 7 socket */
const struct optdesc opt_so_bindtodevice={"so-bindtodevice","if",OPT_SO_BINDTODEVICE,GROUP_SOCKET,PH_PASTSOCKET,TYPE_NAME,OFUNC_SOCKOPT,SOL_SOCKET,SO_BINDTODEVICE};
#endif
#ifdef SO_BSDCOMPAT
const struct optdesc opt_so_bsdcompat= { "so-bsdcompat","bsdcompat",OPT_SO_BSDCOMPAT,GROUP_SOCKET, PH_PASTSOCKET, TYPE_INT, OFUNC_SOCKOPT, SOL_SOCKET, SO_BSDCOMPAT };
#endif
#ifdef SO_CKSUMRECV
const struct optdesc opt_so_cksumrecv= { "so-cksumrecv","cksumrecv",OPT_SO_CKSUMRECV,GROUP_SOCKET, PH_PASTSOCKET, TYPE_INT, OFUNC_SOCKOPT, SOL_SOCKET, SO_CKSUMRECV };
#endif /* SO_CKSUMRECV */
#ifdef SO_KERNACCEPT /* AIX 4.3.3 */
const struct optdesc opt_so_kernaccept={ "so-kernaccept","kernaccept",OPT_SO_KERNACCEPT,GROUP_SOCKET,PH_PASTSOCKET,TYPE_INT, OFUNC_SOCKOPT, SOL_SOCKET, SO_KERNACCEPT};
#endif /* SO_KERNACCEPT */
#ifdef SO_NO_CHECK
const struct optdesc opt_so_no_check = { "so-no-check", "nocheck",OPT_SO_NO_CHECK, GROUP_SOCKET, PH_PASTSOCKET, TYPE_INT, OFUNC_SOCKOPT, SOL_SOCKET, SO_NO_CHECK };
#endif
#ifdef SO_NOREUSEADDR /* AIX 4.3.3 */
const struct optdesc opt_so_noreuseaddr={"so-noreuseaddr","noreuseaddr",OPT_SO_NOREUSEADDR,GROUP_SOCKET,PH_PASTSOCKET,TYPE_INT,OFUNC_SOCKOPT,SOL_SOCKET, SO_NOREUSEADDR};
#endif /* SO_NOREUSEADDR */
#ifdef SO_PASSCRED
const struct optdesc opt_so_passcred = { "so-passcred", "passcred", OPT_SO_PASSCRED, GROUP_SOCKET, PH_PASTSOCKET, TYPE_INT, OFUNC_SOCKOPT, SOL_SOCKET, SO_PASSCRED};
#endif
#ifdef SO_PEERCRED
const struct optdesc opt_so_peercred = { "so-peercred", "peercred", OPT_SO_PEERCRED, GROUP_SOCKET, PH_PASTSOCKET, TYPE_INT3,OFUNC_SOCKOPT, SOL_SOCKET, SO_PEERCRED};
#endif
#ifdef SO_PRIORITY
const struct optdesc opt_so_priority = { "so-priority", "priority", OPT_SO_PRIORITY, GROUP_SOCKET, PH_PASTSOCKET, TYPE_INT, OFUNC_SOCKOPT, SOL_SOCKET, SO_PRIORITY};
#endif
#ifdef SO_REUSEPORT /* AIX 4.3.3, BSD, HP-UX */
const struct optdesc opt_so_reuseport= { "so-reuseport","reuseport",OPT_SO_REUSEPORT,GROUP_SOCKET, PH_PASTSOCKET, TYPE_INT, OFUNC_SOCKOPT, SOL_SOCKET, SO_REUSEPORT };
#endif /* defined(SO_REUSEPORT) */
#ifdef SO_SECURITY_AUTHENTICATION
const struct optdesc opt_so_security_authentication={"so-security-authentication","securityauthentication",OPT_SO_SECURITY_AUTHENTICATION,GROUP_SOCKET,PH_PASTSOCKET,TYPE_INT,OFUNC_SOCKOPT,SOL_SOCKET,SO_SECURITY_AUTHENTICATION};
#endif
#ifdef SO_SECURITY_ENCRYPTION_NETWORK
const struct optdesc opt_so_security_encryption_network={"so-security-encryption-network","securityencryptionnetwork",OPT_SO_SECURITY_ENCRYPTION_NETWORK,GROUP_SOCKET,PH_PASTSOCKET,TYPE_INT,OFUNC_SOCKOPT,SOL_SOCKET,SO_SECURITY_ENCRYPTION_NETWORK};
#endif
#ifdef SO_SECURITY_ENCRYPTION_TRANSPORT
const struct optdesc opt_so_security_encryption_transport={"so-security-encryption-transport","securityencryptiontransport",OPT_SO_SECURITY_ENCRYPTION_TRANSPORT,GROUP_SOCKET,PH_PASTSOCKET,TYPE_INT,OFUNC_SOCKOPT,SOL_SOCKET,SO_SECURITY_ENCRYPTION_TRANSPORT};
#endif
#ifdef SO_USE_IFBUFS
const struct optdesc opt_so_use_ifbufs={ "so-use-ifbufs","useifbufs",OPT_SO_USE_IFBUFS,GROUP_SOCKET,PH_PASTSOCKET,TYPE_INT, OFUNC_SOCKOPT, SOL_SOCKET, SO_USE_IFBUFS};
#endif /* SO_USE_IFBUFS */
#ifdef SO_USELOOPBACK /* AIX433, Solaris, HP-UX */
const struct optdesc opt_so_useloopback={"so-useloopback","useloopback",OPT_SO_USELOOPBACK,GROUP_SOCKET,PH_PASTSOCKET,TYPE_INT,OFUNC_SOCKOPT, SOL_SOCKET, SO_USELOOPBACK};
#endif /* SO_USELOOPBACK */
#ifdef SO_DGRAM_ERRIND /* Solaris */
const struct optdesc opt_so_dgram_errind={"so-dgram-errind","dgramerrind",OPT_SO_DGRAM_ERRIND,GROUP_SOCKET,PH_PASTSOCKET,TYPE_INT,OFUNC_SOCKOPT,SOL_SOCKET,SO_DGRAM_ERRIND};
#endif /* SO_DGRAM_ERRIND */
#ifdef SO_DONTLINGER /* Solaris */
const struct optdesc opt_so_dontlinger = {"so-dontlinger", "dontlinger", OPT_SO_DONTLINGER, GROUP_SOCKET,PH_PASTSOCKET,TYPE_INT,OFUNC_SOCKOPT,SOL_SOCKET,SO_DONTLINGER };
#endif
#ifdef SO_PROTOTYPE /* Solaris, HP-UX */
const struct optdesc opt_so_prototype = {"so-prototype", "prototype", OPT_SO_PROTOTYPE, GROUP_SOCKET,PH_PASTSOCKET,TYPE_INT,OFUNC_SOCKOPT,SOL_SOCKET,SO_PROTOTYPE };
#endif
#ifdef FIOSETOWN
const struct optdesc opt_fiosetown = { "fiosetown", NULL, OPT_FIOSETOWN, GROUP_SOCKET, PH_PASTSOCKET, TYPE_INT, OFUNC_IOCTL, FIOSETOWN };
#endif
#ifdef SIOCSPGRP
const struct optdesc opt_siocspgrp = { "siocspgrp", NULL, OPT_SIOCSPGRP, GROUP_SOCKET, PH_PASTSOCKET, TYPE_INT, OFUNC_IOCTL, SIOCSPGRP };
#endif
const struct optdesc opt_bind = { "bind", NULL, OPT_BIND, GROUP_SOCKET, PH_BIND, TYPE_STRING,OFUNC_SPEC };
const struct optdesc opt_connect_timeout = { "connect-timeout", NULL, OPT_CONNECT_TIMEOUT, GROUP_SOCKET, PH_PASTSOCKET, TYPE_TIMEVAL, OFUNC_OFFSET, (int)&((xiofile_t *)0)->stream.para.socket.connect_timeout };
const struct optdesc opt_protocol_family = { "protocol-family", "pf", OPT_PROTOCOL_FAMILY, GROUP_SOCKET, PH_PRESOCKET, TYPE_STRING, OFUNC_SPEC };
/* a subroutine that is common to all socket addresses that want to connect
to a peer address.
might fork.
returns 0 on success.
*/
int _xioopen_connect(struct single *xfd, struct sockaddr *us, size_t uslen,
struct sockaddr *them, size_t themlen,
struct opt *opts, int pf, int stype, int proto,
bool alt, int level) {
int fcntl_flags = 0;
char infobuff[256];
union sockaddr_union la;
socklen_t lalen = themlen;
int _errno;
int result;
if ((xfd->fd = Socket(pf, stype, proto)) < 0) {
Msg4(level,
"socket(%d, %d, %d): %s", pf, stype, proto, strerror(errno));
return STAT_RETRYLATER;
}
applyopts_offset(xfd, opts);
applyopts(xfd->fd, opts, PH_PASTSOCKET);
applyopts(xfd->fd, opts, PH_FD);
applyopts_cloexec(xfd->fd, opts);
applyopts(xfd->fd, opts, PH_PREBIND);
applyopts(xfd->fd, opts, PH_BIND);
#if WITH_TCP || WITH_UDP
if (alt) {
union sockaddr_union sin, *sinp;
unsigned short *port, i, N;
div_t dv;
bool problem;
/* prepare sockaddr for bind probing */
if (us) {
sinp = (union sockaddr_union *)us;
} else {
if (them->sa_family == AF_INET) {
socket_in_init(&sin.ip4);
#if WITH_IP6
} else {
socket_in6_init(&sin.ip6);
#endif
}
sinp = &sin;
}
if (them->sa_family == AF_INET) {
port = &sin.ip4.sin_port;
#if WITH_IP6
} else if (them->sa_family == AF_INET6) {
port = &sin.ip6.sin6_port;
#endif
} else {
port = 0; /* just to make compiler happy */
}
/* combine random+step variant to quickly find a free port when only
few are in use, and certainly find a free port in defined time even
if there are almost all in use */
/* dirt 1: having tcp/udp code in socket function */
/* dirt 2: using a time related system call for init of random */
{
/* generate a random port, with millisecond random init */
#if 0
struct timeb tb;
ftime(&tb);
srandom(tb.time*1000+tb.millitm);
#else
struct timeval tv;
struct timezone tz;
tz.tz_minuteswest = 0;
tz.tz_dsttime = 0;
if ((result = Gettimeofday(&tv, &tz)) < 0) {
Warn2("gettimeofday(%p, {0,0}): %s", &tv, strerror(errno));
}
srandom(tv.tv_sec*1000000+tv.tv_usec);
#endif
}
dv = div(random(), IPPORT_RESERVED-XIO_IPPORT_LOWER);
i = N = XIO_IPPORT_LOWER + dv.rem;
problem = false;
do { /* loop over lowport bind() attempts */
*port = htons(i);
if (Bind(xfd->fd, (struct sockaddr *)sinp, sizeof(*sinp)) < 0) {
Msg4(errno==EADDRINUSE?E_INFO:level,
"bind(%d, {%s}, "F_Zd"): %s", xfd->fd,
sockaddr_info(&sinp->soa, sizeof(*sinp), infobuff, sizeof(infobuff)),
sizeof(*sinp), strerror(errno));
if (errno != EADDRINUSE) {
Close(xfd->fd);
return STAT_RETRYLATER;
}
} else {
break; /* could bind to port, good, continue past loop */
}
--i; if (i < XIO_IPPORT_LOWER) i = IPPORT_RESERVED-1;
if (i == N) {
Msg(level, "no low port available");
/*errno = EADDRINUSE; still assigned */
Close(xfd->fd);
return STAT_RETRYLATER;
}
} while (i != N);
} else
#endif /* WITH_TCP || WITH_UDP */
if (us) {
if (Bind(xfd->fd, us, uslen) < 0) {
Msg4(level, "bind(%d, {%s}, "F_Zd"): %s",
xfd->fd, sockaddr_info(us, uslen, infobuff, sizeof(infobuff)),
uslen, strerror(errno));
Close(xfd->fd);
return STAT_RETRYLATER;
}
}
applyopts(xfd->fd, opts, PH_PASTBIND);
applyopts(xfd->fd, opts, PH_CONNECT);
if (xfd->para.socket.connect_timeout.tv_sec != 0 ||
xfd->para.socket.connect_timeout.tv_usec != 0) {
fcntl_flags = Fcntl(xfd->fd, F_GETFL);
Fcntl_l(xfd->fd, F_SETFL, fcntl_flags|O_NONBLOCK);
}
result = Connect(xfd->fd, (struct sockaddr *)them, themlen);
_errno = errno;
la.soa.sa_family = them->sa_family; lalen = sizeof(la);
if (Getsockname(xfd->fd, &la.soa, &lalen) < 0) {
Msg4(level-1, "getsockname(%d, %p, {%d}): %s",
xfd->fd, &la.soa, lalen, strerror(errno));
}
errno = _errno;
if (result < 0) {
if (errno == EINPROGRESS) {
if (xfd->para.socket.connect_timeout.tv_sec != 0 ||
xfd->para.socket.connect_timeout.tv_usec != 0) {
struct timeval timeout;
fd_set readfds, writefds, exceptfds;
int result;
Info4("connect(%d, %s, "F_Zd"): %s",
xfd->fd, sockaddr_info(them, themlen, infobuff, sizeof(infobuff)),
themlen, strerror(errno));
timeout = xfd->para.socket.connect_timeout;
FD_ZERO(&readfds); FD_ZERO(&writefds); FD_ZERO(&exceptfds);
FD_SET(xfd->fd, &readfds); FD_SET(xfd->fd, &writefds);
result =
Select(xfd->fd+1, &readfds, &writefds, &exceptfds, &timeout);
if (result < 0) {
Msg2(level, "select(%d,,,,): %s", xfd->fd+1, strerror(errno));
return STAT_RETRYLATER;
}
if (result == 0) {
Msg2(level, "connecting to %s: %s",
sockaddr_info(them, themlen, infobuff, sizeof(infobuff)),
strerror(ETIMEDOUT));
return STAT_RETRYLATER;
}
if (FD_ISSET(xfd->fd, &readfds)) {
#if 0
unsigned char dummy[1];
Read(xfd->fd, &dummy, 1); /* get error message */
Msg2(level, "connecting to %s: %s",
sockaddr_info(them, infobuff, sizeof(infobuff)),
strerror(errno));
#else
Connect(xfd->fd, them, themlen); /* get error message */
Msg4(level, "connect(%d, %s, "F_Zd"): %s",
xfd->fd, sockaddr_info(them, themlen, infobuff, sizeof(infobuff)),
themlen, strerror(errno));
#endif
return STAT_RETRYLATER;
}
/* otherwise OK */
Fcntl_l(xfd->fd, F_SETFL, fcntl_flags);
} else {
Warn4("connect(%d, %s, "F_Zd"): %s",
xfd->fd, sockaddr_info(them, themlen, infobuff, sizeof(infobuff)),
themlen, strerror(errno));
}
} else if (pf == PF_UNIX && errno == EPROTOTYPE) {
/* this is for UNIX domain sockets: a connect attempt seems to be
the only way to distinguish stream and datagram sockets */
int _errno = errno;
Info4("connect(%d, %s, "F_Zd"): %s",
xfd->fd, sockaddr_info(them, themlen, infobuff, sizeof(infobuff)),
themlen, strerror(errno));
#if 0
Info("assuming datagram socket");
xfd->dtype = DATA_RECVFROM;
xfd->salen = themlen;
memcpy(&xfd->peersa.soa, them, xfd->salen);
#endif
/*!!! and remove bind socket */
Close(xfd->fd); xfd->fd = -1;
errno = _errno;
return -1;
} else {
Msg4(level, "connect(%d, %s, "F_Zd"): %s",
xfd->fd, sockaddr_info(them, themlen, infobuff, sizeof(infobuff)),
themlen, strerror(errno));
Close(xfd->fd);
return STAT_RETRYLATER;
}
}
applyopts_fchown(xfd->fd, opts);
applyopts(xfd->fd, opts, PH_CONNECTED);
applyopts(xfd->fd, opts, PH_LATE);
Notice1("successfully connected from local address %s",
sockaddr_info(&la.soa, themlen, infobuff, sizeof(infobuff)));
return STAT_OK;
}
/* a subroutine that is common to all socket addresses that want to connect
to a peer address.
might fork.
returns 0 on success.
*/
int xioopen_connect(struct single *xfd, struct sockaddr *us, size_t uslen,
struct sockaddr *them, size_t themlen,
struct opt *opts, int pf, int stype, int proto,
bool alt) {
bool dofork = false;
struct opt *opts0;
char infobuff[256];
int level;
int result;
retropt_bool(opts, OPT_FORK, &dofork);
retropt_int(opts, OPT_SO_TYPE, &stype);
opts0 = copyopts(opts, GROUP_ALL);
Notice1("opening connection to %s",
sockaddr_info(them, themlen, infobuff, sizeof(infobuff)));
do { /* loop over retries and forks */
#if WITH_RETRY
if (xfd->forever || xfd->retry) {
level = E_INFO;
} else
#endif /* WITH_RETRY */
level = E_ERROR;
result =
_xioopen_connect(xfd, us, uslen, them, themlen, opts,
pf, stype, proto, alt, level);
switch (result) {
case STAT_OK: break;
#if WITH_RETRY
case STAT_RETRYLATER:
if (xfd->forever || xfd->retry) {
--xfd->retry;
if (result == STAT_RETRYLATER) {
Nanosleep(&xfd->intervall, NULL);
}
dropopts(opts, PH_ALL); opts = copyopts(opts0, GROUP_ALL);
continue;
}
return STAT_NORETRY;
#endif /* WITH_RETRY */
default:
return result;
}
#if WITH_RETRY
if (dofork) {
pid_t pid;
while ((pid = Fork()) < 0) {
int level = E_ERROR;
if (xfd->forever || --xfd->retry) {
level = E_WARN; /* most users won't expect a problem here,
so Notice is too weak */
}
Msg1(level, "fork(): %s", strerror(errno));
if (xfd->forever || xfd->retry) {
dropopts(opts, PH_ALL); opts = copyopts(opts0, GROUP_ALL);
Nanosleep(&xfd->intervall, NULL); continue;
}
return STAT_RETRYLATER;
}
if (pid == 0) { /* child process */
Info1("just born: TCP client process "F_pid, Getpid());
/* drop parents locks, reset FIPS... */
if (xio_forked_inchild() != 0) {
Exit(1);
}
break;
}
/* parent process */
Notice1("forked off child process "F_pid, pid);
Close(xfd->fd);
/* with and without retry */
Nanosleep(&xfd->intervall, NULL);
dropopts(opts, PH_ALL); opts = copyopts(opts0, GROUP_ALL);
continue; /* with next socket() bind() connect() */
} else
#endif /* WITH_RETRY */
{
break;
}
#if 0
if ((result = _xio_openlate(fd, opts)) < 0)
return result;
#endif
} while (true);
return 0;
}
/* common to xioopen_udp_sendto, ..unix_sendto, ..rawip */
int _xioopen_dgram_sendto(/* them is already in xfd->peersa */
union sockaddr_union *us, socklen_t uslen,
struct opt *opts,
int xioflags, xiosingle_t *xfd, unsigned groups,
int pf, int socktype, int ipproto) {
int level = E_ERROR;
union sockaddr_union la; socklen_t lalen = sizeof(la);
char infobuff[256];
if ((xfd->fd = Socket(pf, socktype, ipproto)) < 0) {
Msg4(level,
"socket(%d, %d, %d): %s", pf, socktype, ipproto, strerror(errno));
return STAT_RETRYLATER;
}
applyopts_offset(xfd, opts);
applyopts_single(xfd, opts, PH_PASTSOCKET);
applyopts(xfd->fd, opts, PH_PASTSOCKET);
applyopts(xfd->fd, opts, PH_FD);
applyopts_cloexec(xfd->fd, opts);
applyopts(xfd->fd, opts, PH_PREBIND);
applyopts(xfd->fd, opts, PH_BIND);
if (us) {
if (Bind(xfd->fd, (struct sockaddr *)us, uslen) < 0) {
Msg4(level, "bind(%d, {%s}, "F_Zd"): %s",
xfd->fd, sockaddr_info((struct sockaddr *)us, uslen, infobuff, sizeof(infobuff)),
uslen, strerror(errno));
Close(xfd->fd);
return STAT_RETRYLATER;
}
}
applyopts(xfd->fd, opts, PH_PASTBIND);
/*applyopts(xfd->fd, opts, PH_CONNECT);*/
if (Getsockname(xfd->fd, &la.soa, &lalen) < 0) {
Warn4("getsockname(%d, %p, {%d}): %s",
xfd->fd, &la.soa, lalen, strerror(errno));
}
applyopts_fchown(xfd->fd, opts);
applyopts(xfd->fd, opts, PH_CONNECTED);
applyopts(xfd->fd, opts, PH_LATE);
/* xfd->dtype = DATA_RECVFROM; *//* no, the caller must set this (ev _SKIPIP) */
Notice1("successfully prepared local socket %s",
sockaddr_info(&la.soa, lalen, infobuff, sizeof(infobuff)));
return STAT_OK;
}
static pid_t xio_waitingfor;
static bool xio_hashappened;
void xiosigaction_hasread(int signum, siginfo_t *siginfo, void *ucontext) {
Debug5("xiosigaction_hasread(%d, {%d,%d,%d,"F_pid"}, )",
signum, siginfo->si_signo, siginfo->si_errno, siginfo->si_code,
siginfo->si_pid);
if (xio_waitingfor == siginfo->si_pid) {
xio_hashappened = true;
}
Debug("xiosigaction_hasread() ->");
return;
}
/* waits for incoming packet, checks its source address and port. Depending
on fork option, it may fork a subprocess.
Returns STAT_OK if a the packet was accepted; with fork option, this is already in
a new subprocess!
Other return values indicate a problem; this can happen in the master
process or in a subprocess.
This function does not retry. If you need retries, handle this is a
loop in the calling function.
after fork, we set the forever/retry of the child process to 0
*/
int _xioopen_dgram_recvfrom(struct single *xfd, int xioflags,
struct sockaddr *us, socklen_t uslen,
struct opt *opts,
int pf, int socktype, int proto, int level) {
char *rangename;
socklen_t salen;
bool dofork = false;
pid_t pid; /* mostly int; only used with fork */
char infobuff[256];
char lisname[256];
bool drop = false; /* true if current packet must be dropped */
int result;
retropt_bool(opts, OPT_FORK, &dofork);
if (dofork) {
if (!(xioflags & XIO_MAYFORK)) {
Error("option fork not allowed here");
return STAT_NORETRY;
}
xfd->flags |= XIO_DOESFORK;
}
if (applyopts_single(xfd, opts, PH_INIT) < 0) return STAT_NORETRY;
#if 1
if (dofork) {
#if HAVE_SIGACTION
struct sigaction act;
memset(&act, 0, sizeof(struct sigaction));
act.sa_flags = SA_NOCLDSTOP|SA_RESTART
#ifdef SA_NOMASK
|SA_NOMASK
#endif
;
act.sa_handler = childdied;
if (Sigaction(SIGCHLD, &act, NULL) < 0) {
/*! man does not say that errno is defined */
Warn2("sigaction(SIGCHLD, %p, NULL): %s", childdied, strerror(errno));
}
#else /* HAVE_SIGACTION */
if (Signal(SIGCHLD, childdied) == SIG_ERR) {
Warn2("signal(SIGCHLD, %p): %s", childdied, strerror(errno));
}
#endif /* !HAVE_SIGACTION */
}
#endif /* 1 */
if ((xfd->fd = Socket(pf, socktype, proto)) < 0) {
Msg4(level,
"socket(%d, %d, %d): %s", pf, socktype, proto, strerror(errno));
return STAT_RETRYLATER;
}
applyopts_single(xfd, opts, PH_PASTSOCKET);
applyopts(xfd->fd, opts, PH_PASTSOCKET);
applyopts_cloexec(xfd->fd, opts);
applyopts(xfd->fd, opts, PH_PREBIND);
applyopts(xfd->fd, opts, PH_BIND);
if ((us != NULL) && Bind(xfd->fd, (struct sockaddr *)us, uslen) < 0) {
Msg4(level, "bind(%d, {%s}, "F_Zd"): %s", xfd->fd,
sockaddr_info(us, uslen, infobuff, sizeof(infobuff)), uslen,
strerror(errno));
Close(xfd->fd);
return STAT_RETRYLATER;
}
#if WITH_UNIX
if (pf == AF_UNIX && us != NULL) {
applyopts_named(((struct sockaddr_un *)us)->sun_path, opts, PH_FD);
}
#endif
applyopts(xfd->fd, opts, PH_PASTBIND);
#if WITH_UNIX
if (pf == AF_UNIX && us != NULL) {
/*applyopts_early(((struct sockaddr_un *)us)->sun_path, opts);*/
applyopts_named(((struct sockaddr_un *)us)->sun_path, opts, PH_EARLY);
applyopts_named(((struct sockaddr_un *)us)->sun_path, opts, PH_PREOPEN);
}
#endif /* WITH_UNIX */
#if WITH_IP4 /*|| WITH_IP6*/
if (retropt_string(opts, OPT_RANGE, &rangename) >= 0) {
if (parserange(rangename, pf, &xfd->para.socket.range)
< 0) {
free(rangename);
return STAT_NORETRY;
}
free(rangename);
xfd->para.socket.dorange = true;
}
#endif
#if (WITH_TCP || WITH_UDP) && WITH_LIBWRAP
xio_retropt_tcpwrap(xfd, opts);
#endif /* && (WITH_TCP || WITH_UDP) && WITH_LIBWRAP */
if (xioopts.logopt == 'm') {
Info("starting recvfrom loop, switching to syslog");
diag_set('y', xioopts.syslogfac); xioopts.logopt = 'y';
} else {
Info("starting recvfrom loop");
}
if (dofork) {
#if HAVE_SIGACTION
{
struct sigaction act;
memset(&act, 0, sizeof(struct sigaction));
act.sa_flags = SA_NOCLDSTOP|SA_RESTART
#ifdef SA_SIGINFO /* not on Linux 2.0(.33) */
|SA_SIGINFO
#endif
#ifdef SA_NOMASK
|SA_NOMASK
#endif
;
#if 1 || HAVE_SIGACTION_SASIGACTION
act.sa_sigaction = xiosigaction_hasread;
#else /* Linux 2.0(.33) does not have sigaction.sa_sigaction */
act.sa_handler = xiosighandler_hasread;
#endif
if (Sigaction(SIGUSR1, &act, NULL) < 0) {
/*! Linux man does not explicitely say that errno is defined */
Warn1("sigaction(SIGUSR1, {&xiosigaction_subaddr_ok}, NULL): %s", strerror(errno));
}
if (Sigaction(SIGCHLD, &act, NULL) < 0) {
/*! Linux man does not explicitely say that errno is defined */
Warn1("sigaction(SIGCHLD, {&xiosigaction_subaddr_ok}, NULL): %s", strerror(errno));
}
}
#else /* !HAVE_SIGACTION */
/*!!!*/
if (Signal(SIGUSR1, xiosigaction_hasread) == SIG_ERR) {
Warn1("signal(SIGUSR1, xiosigaction_hasread): %s", strerror(errno));
}
if (Signal(SIGCHLD, xiosigaction_hasread) == SIG_ERR) {
Warn1("signal(SIGCHLD, xiosigaction_hasread): %s", strerror(errno));
}
#endif /* !HAVE_SIGACTION */
}
while (true) { /* but we only loop if fork option is set */
char peername[256];
union sockaddr_union _peername;
union sockaddr_union _sockname;
union sockaddr_union *pa = &_peername; /* peer address */
union sockaddr_union *la = &_sockname; /* local address */
socklen_t palen = sizeof(_peername); /* peer address size */
socket_init(pf, pa);
salen = sizeof(struct sockaddr);
if (drop) {
char *dummy[2];
Recv(xfd->fd, dummy, sizeof(dummy), 0);
drop = true;
}
/* loop until select() returns valid */
do {
fd_set in, out, expt;
/*? int level = E_ERROR;*/
if (us != NULL) {
Notice1("receiving on %s", sockaddr_info(us, uslen, lisname, sizeof(lisname)));
} else {
Notice1("receiving IP protocol %u", proto);
}
FD_ZERO(&in); FD_ZERO(&out); FD_ZERO(&expt);
FD_SET(xfd->fd, &in);
if (Select(xfd->fd+1, &in, &out, &expt, NULL) > 0) {
break;
}
if (errno == EINTR) {
continue;
}
Msg2(level, "select(, {%d}): %s", xfd->fd, strerror(errno));
Close(xfd->fd);
return STAT_RETRYLATER;
} while (true);
if (xiogetpacketsrc(xfd->fd, pa, &palen) < 0) {
return STAT_RETRYLATER;
}
Notice1("receiving packet from %s"/*"src"*/,
sockaddr_info((struct sockaddr *)pa, palen, peername, sizeof(peername))/*,
sockaddr_info(&la->soa, sockname, sizeof(sockname))*/);
if (xiocheckpeer(xfd, pa, la) < 0) {
/* drop packet */
char buff[512];
Recv(xfd->fd, buff, sizeof(buff), 0);
continue;
}
Info1("permitting packet from %s",
sockaddr_info((struct sockaddr *)pa, palen,
infobuff, sizeof(infobuff)));
applyopts(xfd->fd, opts, PH_FD);
applyopts(xfd->fd, opts, PH_CONNECTED);
xfd->peersa = *(union sockaddr_union *)pa;
xfd->salen = palen;
if (dofork) {
sigset_t mask_sigchldusr1;
const char *forkwaitstring;
int forkwaitsecs = 0;
/* we must prevent that the current packet triggers another fork;
therefore we wait for a signal from the recent child: USR1
indicates that is has consumed the last packet; CHLD means it has
terminated */
/* block SIGCHLD and SIGUSR1 until parent is ready to react */
sigemptyset(&mask_sigchldusr1);
sigaddset(&mask_sigchldusr1, SIGCHLD);
sigaddset(&mask_sigchldusr1, SIGUSR1);
Sigprocmask(SIG_BLOCK, &mask_sigchldusr1, NULL);
if ((pid = Fork()) < 0) {
Msg1(level, "fork(): %s", strerror(errno));
Close(xfd->fd);
Sigprocmask(SIG_UNBLOCK, &mask_sigchldusr1, NULL);
return STAT_RETRYLATER;
}
/* gdb recommends to have env controlled sleep after fork */
if (forkwaitstring = getenv("SOCAT_FORK_WAIT")) {
forkwaitsecs = atoi(forkwaitstring);
Sleep(forkwaitsecs);
}
if (pid == 0) { /* child */
/* no reason to block SIGCHLD in child process */
Sigprocmask(SIG_UNBLOCK, &mask_sigchldusr1, NULL);
xfd->ppid = Getppid(); /* send parent a signal when packet has
been consumed */
#if WITH_RETRY
/* !? */
xfd->retry = 0;
xfd->forever = 0;
level = E_ERROR;
#endif /* WITH_RETRY */
/* drop parents locks, reset FIPS... */
if (xio_forked_inchild() != 0) {
Exit(1);
}
#if WITH_UNIX
/* with UNIX sockets: only listening parent is allowed to remove
the socket file */
xfd->opt_unlink_close = false;
#endif /* WITH_UNIX */
break;
}
/* server: continue loop with listen */
Notice1("forked off child process "F_pid, pid);
xio_waitingfor = pid;
/* now we are ready to handle signals */
Sigprocmask(SIG_UNBLOCK, &mask_sigchldusr1, NULL);
while (!xio_hashappened) {
Sleep(UINT_MAX); /* any signal lets us continue */
}
xio_waitingfor = 0; /* so this child will not set hashappened again */
xio_hashappened = false;
Info("continue listening");
} else {
break;
}
}
if ((result = _xio_openlate(xfd, opts)) != 0)
return STAT_NORETRY;
return STAT_OK;
}
/* returns STAT_* */
int _xioopen_dgram_recv(struct single *xfd, int xioflags,
struct sockaddr *us, socklen_t uslen,
struct opt *opts, int pf, int socktype, int proto,
int level) {
char *rangename;
char infobuff[256];
if (applyopts_single(xfd, opts, PH_INIT) < 0) return STAT_NORETRY;
if ((xfd->fd = Socket(pf, socktype, proto)) < 0) {
Msg4(level,
"socket(%d, %d, %d): %s", pf, socktype, proto, strerror(errno));
return STAT_RETRYLATER;
}
applyopts_single(xfd, opts, PH_PASTSOCKET);
applyopts(xfd->fd, opts, PH_PASTSOCKET);
applyopts_cloexec(xfd->fd, opts);
applyopts(xfd->fd, opts, PH_PREBIND);
applyopts(xfd->fd, opts, PH_BIND);
if ((us != NULL) && Bind(xfd->fd, (struct sockaddr *)us, uslen) < 0) {
Msg4(level, "bind(%d, {%s}, "F_Zd"): %s", xfd->fd,
sockaddr_info(us, uslen, infobuff, sizeof(infobuff)), uslen,
strerror(errno));
Close(xfd->fd);
return STAT_RETRYLATER;
}
#if WITH_UNIX
if (pf == AF_UNIX && us != NULL) {
applyopts_named(((struct sockaddr_un *)us)->sun_path, opts, PH_FD);
}
#endif
applyopts(xfd->fd, opts, PH_PASTBIND);
#if WITH_UNIX
if (pf == AF_UNIX && us != NULL) {
/*applyopts_early(((struct sockaddr_un *)us)->sun_path, opts);*/
applyopts_named(((struct sockaddr_un *)us)->sun_path, opts, PH_EARLY);
applyopts_named(((struct sockaddr_un *)us)->sun_path, opts, PH_PREOPEN);
}
#endif /* WITH_UNIX */
#if WITH_IP4 /*|| WITH_IP6*/
if (retropt_string(opts, OPT_RANGE, &rangename) >= 0) {
if (parserange(rangename, pf, &xfd->para.socket.range)
< 0) {
free(rangename);
return STAT_NORETRY;
}
free(rangename);
xfd->para.socket.dorange = true;
}
#endif
#if (WITH_TCP || WITH_UDP) && WITH_LIBWRAP
xio_retropt_tcpwrap(xfd, opts);
#endif /* && (WITH_TCP || WITH_UDP) && WITH_LIBWRAP */
if (xioopts.logopt == 'm') {
Info("starting recvfrom loop, switching to syslog");
diag_set('y', xioopts.syslogfac); xioopts.logopt = 'y';
} else {
Info("starting recvfrom loop");
}
return STAT_OK;
}
int retropt_socket_pf(struct opt *opts, int *pf) {
char *pfname;
if (retropt_string(opts, OPT_PROTOCOL_FAMILY, &pfname) >= 0) {
if (false) {
;
#if WITH_IP4
} else if (!strcasecmp("inet", pfname) ||
!strcasecmp("inet4", pfname) ||
!strcasecmp("ip4", pfname) ||
!strcasecmp("ipv4", pfname) ||
!strcasecmp("2", pfname)) {
*pf = PF_INET;
#endif /* WITH_IP4 */
#if WITH_IP6
} else if (!strcasecmp("inet6", pfname) ||
!strcasecmp("ip6", pfname) ||
!strcasecmp("ipv6", pfname) ||
!strcasecmp("10", pfname)) {
*pf = PF_INET6;
#endif /* WITH_IP6 */
} else {
Error1("unknown protocol family \"%s\"", pfname);
/*! Warn("falling back to INET");*/
}
free(pfname);
return 0;
}
return -1;
}
int xiogetpacketsrc(int fd, union sockaddr_union *pa, socklen_t *palen) {
char infobuff[256];
char peekbuff[1];
#if 0
struct msghdr msgh = {0};
#if HAVE_STRUCT_IOVEC
struct iovec iovec;
#endif
char ctrlbuff[5120];
msgh.msg_name = pa;
msgh.msg_namelen = *palen;
#if HAVE_STRUCT_IOVEC
iovec.iov_base = peekbuff;
iovec.iov_len = sizeof(peekbuff);
msgh.msg_iov = &iovec;
msgh.msg_iovlen = 1;
#endif
#if HAVE_STRUCT_MSGHDR_MSGCONTROL
msgh.msg_control = ctrlbuff;
#endif
#if HAVE_STRUCT_MSGHDR_MSGCONTROLLEN
msgh.msg_controllen = sizeof(ctrlbuff);
#endif
#if HAVE_STRUCT_MSGHDR_MSGFLAGS
msgh.msg_flags = 0;
#endif
if (Recvmsg(fd, &msgh, MSG_PEEK
#ifdef MSG_TRUNC
|MSG_TRUNC
#endif
) < 0) {
Notice1("packet from %s",
sockaddr_info(&pa->soa, infobuff, sizeof(infobuff)));
Warn1("recvmsg(): %s", strerror(errno));
return STAT_RETRYLATER;
}
*palen = msgh.msg_namelen;
return STAT_OK;
#else
if (Recvfrom(fd, peekbuff, sizeof(peekbuff), MSG_PEEK
#ifdef MSG_TRUNC
|MSG_TRUNC
#endif
,
&pa->soa, palen) < 0) {
Notice1("packet from %s",
sockaddr_info(&pa->soa, *palen, infobuff, sizeof(infobuff)));
Warn1("recvfrom(): %s", strerror(errno));
return STAT_RETRYLATER;
}
return STAT_OK;
#endif
}
int xiocheckrange(union sockaddr_union *sa, union xiorange_union *range) {
switch (sa->soa.sa_family) {
#if WITH_IP4
case PF_INET:
return
xiocheckrange_ip4(&sa->ip4, &range->ip4);
#endif /* WITH_IP4 */
#if WITH_IP6
case PF_INET6:
return
xiocheckrange_ip6(&sa->ip6, &range->ip6);
#endif /* WITH_IP6 */
}
return -1;
}
int xiocheckpeer(xiosingle_t *xfd,
union sockaddr_union *pa, union sockaddr_union *la) {
char infobuff[256];
int result;
#if WITH_IP4
if (xfd->para.socket.dorange) {
if (xiocheckrange(pa, &xfd->para.socket.range) < 0) {
char infobuff[256];
Warn1("refusing connection from %s due to range option",
sockaddr_info((struct sockaddr *)pa, 0,
infobuff, sizeof(infobuff)));
return -1;
}
Info1("permitting connection from %s due to range option",
sockaddr_info((struct sockaddr *)pa, 0,
infobuff, sizeof(infobuff)));
}
#endif /* WITH_IP4 */
#if WITH_TCP || WITH_UDP
if (xfd->para.socket.ip.dosourceport) {
#if WITH_IP4
if (pa->soa.sa_family == AF_INET &&
ntohs(((struct sockaddr_in *)pa)->sin_port) != xfd->para.socket.ip.sourceport) {
Warn1("refusing connection from %s due to wrong sourceport",
sockaddr_info((struct sockaddr *)pa, 0,
infobuff, sizeof(infobuff)));
return -1;
}
#endif /* WITH_IP4 */
#if WITH_IP6
if (pa->soa.sa_family == AF_INET6 &&
ntohs(((struct sockaddr_in6 *)pa)->sin6_port) != xfd->para.socket.ip.sourceport) {
Warn1("refusing connection from %s due to sourceport option",
sockaddr_info((struct sockaddr *)pa, 0,
infobuff, sizeof(infobuff)));
return -1;
}
#endif /* WITH_IP6 */
Info1("permitting connection from %s due to sourceport option",
sockaddr_info((struct sockaddr *)pa, 0,
infobuff, sizeof(infobuff)));
} else if (xfd->para.socket.ip.lowport) {
if (pa->soa.sa_family == AF_INET &&
ntohs(((struct sockaddr_in *)pa)->sin_port) >= IPPORT_RESERVED) {
Warn1("refusing connection from %s due to lowport option",
sockaddr_info((struct sockaddr *)pa, 0,
infobuff, sizeof(infobuff)));
return -1;
}
#if WITH_IP6
else if (pa->soa.sa_family == AF_INET6 &&
ntohs(((struct sockaddr_in6 *)pa)->sin6_port) >=
IPPORT_RESERVED) {
Warn1("refusing connection from %s due to lowport option",
sockaddr_info((struct sockaddr *)pa, 0,
infobuff, sizeof(infobuff)));
return -1;
}
#endif /* WITH_IP6 */
Info1("permitting connection from %s due to lowport option",
sockaddr_info((struct sockaddr *)pa, 0,
infobuff, sizeof(infobuff)));
}
#endif /* WITH_TCP || WITH_UDP */
#if (WITH_TCP || WITH_UDP) && WITH_LIBWRAP
result = xio_tcpwrap_check(xfd, la, pa);
if (result < 0) {
char infobuff[256];
Warn1("refusing connection from %s due to tcpwrapper option",
sockaddr_info((struct sockaddr *)pa, 0,
infobuff, sizeof(infobuff)));
return -1;
} else if (result > 0) {
Info1("permitting connection from %s due to tcpwrapper option",
sockaddr_info((struct sockaddr *)pa, 0,
infobuff, sizeof(infobuff)));
}
#endif /* (WITH_TCP || WITH_UDP) && WITH_LIBWRAP */
return 0; /* permitted */
}
#endif /* _WITH_SOCKET */