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socat/xio-socket.c

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/* source: xio-socket.c */
/* Copyright Gerhard Rieger and contributors (see file CHANGES) */
/* Published under the GNU General Public License V.2, see file COPYING */
/* this file contains the source for socket related functions, and the
implementation of generic socket addresses */
#include "xiosysincludes.h"
#if _WITH_SOCKET
#include "xioopen.h"
#include "xio-ascii.h"
#include "xio-socket.h"
#include "xio-named.h"
#include "xio-unix.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-listen.h"
#include "xio-ipapp.h" /*! not clean */
#include "xio-tcpwrap.h"
static
int xioopen_socket_connect(int argc, const char *argv[], struct opt *opts,
int xioflags, xiofile_t *xfd, unsigned groups,
int dummy1, int dummy2, int dummy3);
static
int xioopen_socket_listen(int argc, const char *argv[], struct opt *opts,
int xioflags, xiofile_t *xfd, unsigned groups,
int dummy1, int dummy2, int dummy3);
static
int xioopen_socket_sendto(int argc, const char *argv[], struct opt *opts,
int xioflags, xiofile_t *xfd, unsigned groups,
int dummy1, int dummy2, int dummy3);
static
int xioopen_socket_datagram(int argc, const char *argv[], struct opt *opts,
int xioflags, xiofile_t *xfd, unsigned groups,
int dummy1, int dummy2, int dummy3);
static
int xioopen_socket_recvfrom(int argc, const char *argv[], struct opt *opts,
int xioflags, xiofile_t *xfd, unsigned groups,
int dummy1, int socktype, int dummy3);
static
int xioopen_socket_recv(int argc, const char *argv[], struct opt *opts,
int xioflags, xiofile_t *xfd, unsigned groups,
int dumy1, int dummy2, int dummy3);
static
int _xioopen_socket_sendto(const char *pfname, const char *type,
const char *proto, const char *address,
struct opt *opts, int xioflags, xiofile_t *xxfd,
unsigned groups);
static int
xiolog_ancillary_socket(struct cmsghdr *cmsg, int *num,
char *typbuff, int typlen,
char *nambuff, int namlen,
char *envbuff, int envlen,
char *valbuff, int vallen);
static int xiobind(
struct single *xfd,
union sockaddr_union *us,
size_t uslen,
struct opt *opts,
int pf,
bool alt,
int level);
#if WITH_GENERICSOCKET
/* generic socket addresses */
const struct addrdesc xioaddr_socket_connect = { "socket-connect", 1, xioopen_socket_connect, GROUP_FD|GROUP_SOCKET|GROUP_CHILD|GROUP_RETRY, 0, 0, 0 HELP(":<domain>:<protocol>:<remote-address>") };
#if WITH_LISTEN
const struct addrdesc xioaddr_socket_listen = { "socket-listen", 1, xioopen_socket_listen, GROUP_FD|GROUP_SOCKET|GROUP_LISTEN|GROUP_RANGE|GROUP_CHILD|GROUP_RETRY, 0, 0, 0 HELP(":<domain>:<protocol>:<local-address>") };
#endif /* WITH_LISTEN */
const struct addrdesc xioaddr_socket_sendto = { "socket-sendto", 3, xioopen_socket_sendto, GROUP_FD|GROUP_SOCKET, 0, 0, 0 HELP(":<domain>:<type>:<protocol>:<remote-address>") };
const struct addrdesc xioaddr_socket_datagram= { "socket-datagram", 3, xioopen_socket_datagram, GROUP_FD|GROUP_SOCKET|GROUP_RANGE, 0, 0, 0 HELP(":<domain>:<type>:<protocol>:<remote-address>") };
const struct addrdesc xioaddr_socket_recvfrom= { "socket-recvfrom", 3, xioopen_socket_recvfrom, GROUP_FD|GROUP_SOCKET|GROUP_RANGE|GROUP_CHILD, 0, 0, 0 HELP(":<domain>:<type>:<protocol>:<local-address>") };
const struct addrdesc xioaddr_socket_recv = { "socket-recv", 1, xioopen_socket_recv, GROUP_FD|GROUP_SOCKET|GROUP_RANGE, 0, 0, 0 HELP(":<domain>:<type>:<protocol>:<local-address>") };
#endif /* WITH_GENERICSOCKET */
/* the following options apply not only to generic socket addresses but to all
addresses that have anything to do with sockets */
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_PREBIND, 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_SOCKET, TYPE_INT, OFUNC_SPEC, 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_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
/* 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_TIMESTAMP
const struct optdesc opt_so_timestamp= { "so-timestamp","timestamp",OPT_SO_TIMESTAMP,GROUP_SOCKET, PH_PASTSOCKET, TYPE_INT, OFUNC_SOCKOPT, SOL_SOCKET, SO_TIMESTAMP };
#endif
#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, Linux >=3.9 */
const struct optdesc opt_so_reuseport= { "so-reuseport","reuseport",OPT_SO_REUSEPORT,GROUP_SOCKET, PH_PREBIND, 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
/* the SO_PROTOTYPE is OS defined on Solaris, HP-UX; we lend this for a more
general purpose */
const struct optdesc opt_so_prototype = {"so-protocol", "protocol", OPT_SO_PROTOTYPE, GROUP_SOCKET,PH_SOCKET, TYPE_INT,OFUNC_SPEC, SOL_SOCKET,SO_PROTOCOL };
#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, XIO_OFFSETOF(para.socket.connect_timeout) };
const struct optdesc opt_protocol_family = { "protocol-family", "pf", OPT_PROTOCOL_FAMILY, GROUP_SOCKET, PH_PRESOCKET, TYPE_STRING, OFUNC_SPEC };
const struct optdesc opt_protocol = { "protocol", NULL, OPT_PROTOCOL, GROUP_SOCKET, PH_PRESOCKET, TYPE_STRING, OFUNC_SPEC };
/* generic setsockopt() options */
const struct optdesc opt_setsockopt = { "setsockopt", "sockopt", OPT_SETSOCKOPT_BIN, GROUP_SOCKET,PH_CONNECTED, TYPE_INT_INT_BIN, OFUNC_SOCKOPT_GENERIC, 0, 0 };
const struct optdesc opt_setsockopt_int = { "setsockopt-int", "sockopt-int", OPT_SETSOCKOPT_INT, GROUP_SOCKET,PH_CONNECTED, TYPE_INT_INT_INT, OFUNC_SOCKOPT_GENERIC, 0, 0 };
const struct optdesc opt_setsockopt_bin = { "setsockopt-bin", "sockopt-bin", OPT_SETSOCKOPT_BIN, GROUP_SOCKET,PH_CONNECTED, TYPE_INT_INT_BIN, OFUNC_SOCKOPT_GENERIC, 0, 0 };
const struct optdesc opt_setsockopt_string = { "setsockopt-string", "sockopt-string", OPT_SETSOCKOPT_STRING, GROUP_SOCKET,PH_CONNECTED, TYPE_INT_INT_STRING, OFUNC_SOCKOPT_GENERIC, 0, 0 };
const struct optdesc opt_setsockopt_listen = { "setsockopt-listen", "sockopt-listen", OPT_SETSOCKOPT_LISTEN, GROUP_SOCKET,PH_PREBIND, TYPE_INT_INT_BIN, OFUNC_SOCKOPT_GENERIC, 0, 0 };
const struct optdesc opt_null_eof = { "null-eof", NULL, OPT_NULL_EOF, GROUP_SOCKET, PH_INIT, TYPE_BOOL, OFUNC_OFFSET, XIO_OFFSETOF(para.socket.null_eof) };
#if WITH_GENERICSOCKET
static
int xioopen_socket_connect(int argc, const char *argv[], struct opt *opts,
int xioflags, xiofile_t *xxfd, unsigned groups,
int dummy1, int dummy2, int dummy3) {
struct single *xfd = &xxfd->stream;
const char *pfname = argv[1];
const char *protname = argv[2];
const char *address = argv[3];
char *garbage;
int pf;
int proto;
int socktype = SOCK_STREAM;
int needbind = 0;
union sockaddr_union them; socklen_t themlen; size_t themsize;
union sockaddr_union us; socklen_t uslen = sizeof(us);
int result;
if (argc != 4) {
Error2("%s: wrong number of parameters (%d instead of 3)",
argv[0], argc-1);
return STAT_NORETRY;
}
pf = strtoul(pfname, &garbage, 0);
if (*garbage != '\0') {
Warn1("garbage in parameter: \"%s\"", garbage);
}
proto = strtoul(protname, &garbage, 0);
if (*garbage != '\0') {
Warn1("garbage in parameter: \"%s\"", garbage);
}
retropt_socket_pf(opts, &pf);
retropt_int(opts, OPT_SO_TYPE, &socktype);
/*retropt_int(opts, OPT_IP_PROTOCOL, &proto);*/
xfd->howtoend = END_SHUTDOWN;
if (applyopts_single(xfd, opts, PH_INIT) < 0) return -1;
applyopts(-1, opts, PH_INIT);
applyopts(-1, opts, PH_EARLY);
themsize = 0;
if ((result =
dalan(address, (uint8_t *)&them.soa.sa_data, &themsize, sizeof(them), 'i'))
< 0) {
Error1("data too long: \"%s\"", address);
} else if (result > 0) {
Error1("syntax error in \"%s\"", address);
}
them.soa.sa_family = pf;
themlen = themsize +
#if HAVE_STRUCT_SOCKADDR_SALEN
sizeof(them.soa.sa_len) +
#endif
sizeof(them.soa.sa_family);
xfd->dtype = XIOREAD_STREAM|XIOWRITE_STREAM;
socket_init(0, &us);
if (retropt_bind(opts, 0 /*pf*/, socktype, proto, (struct sockaddr *)&us, &uslen, 3,
0, 0)
!= STAT_NOACTION) {
needbind = true;
us.soa.sa_family = pf;
}
if ((result =
xioopen_connect(xfd,
needbind?&us:NULL, uslen,
(struct sockaddr *)&them, themlen,
opts, pf, socktype, proto, false)) != 0) {
return result;
}
if ((result = _xio_openlate(xfd, opts)) < 0) {
return result;
}
return STAT_OK;
}
#if WITH_LISTEN
static
int xioopen_socket_listen(int argc, const char *argv[], struct opt *opts,
int xioflags, xiofile_t *xxfd, unsigned groups,
int dummy1, int dummy2, int dummy3) {
struct single *xfd = &xxfd->stream;
const char *pfname = argv[1];
const char *protname = argv[2];
const char *usname = argv[3];
char *garbage;
int pf;
int proto;
int socktype = SOCK_STREAM;
union sockaddr_union us; socklen_t uslen; size_t ussize;
struct opt *opts0;
int result;
if (argc != 4) {
Error2("%s: wrong number of parameters (%d instead of 3)",
argv[0], argc-1);
return STAT_NORETRY;
}
pf = strtoul(pfname, &garbage, 0);
if (*garbage != '\0') {
Warn1("garbage in parameter: \"%s\"", garbage);
}
proto = strtoul(protname, &garbage, 0);
if (*garbage != '\0') {
Warn1("garbage in parameter: \"%s\"", garbage);
}
retropt_socket_pf(opts, &pf);
retropt_int(opts, OPT_SO_TYPE, &socktype);
/*retropt_int(opts, OPT_IP_PROTOCOL, &proto);*/
xfd->howtoend = END_SHUTDOWN;
socket_init(0, &us);
ussize = 0;
if ((result =
dalan(usname, (uint8_t *)&us.soa.sa_data, &ussize, sizeof(us), 'i'))
< 0) {
Error1("data too long: \"%s\"", usname);
} else if (result > 0) {
Error1("syntax error in \"%s\"", usname);
}
uslen = ussize + sizeof(us.soa.sa_family)
#if HAVE_STRUCT_SOCKADDR_SALEN
+ sizeof(us.soa.sa_len)
#endif
;
us.soa.sa_family = pf;
if (applyopts_single(xfd, opts, PH_INIT) < 0) return -1;
applyopts(-1, opts, PH_INIT);
applyopts(-1, opts, PH_EARLY);
opts0 = copyopts(opts, GROUP_ALL);
if ((result =
xioopen_listen(xfd, xioflags,
&us.soa, uslen,
opts, opts0, 0/*instead of pf*/, socktype, proto))
!= STAT_OK)
return result;
return STAT_OK;
}
#endif /* WITH_LISTEN */
/* we expect the form: ...:domain:type:protocol:remote-address */
static
int xioopen_socket_sendto(int argc, const char *argv[], struct opt *opts,
int xioflags, xiofile_t *xxfd, unsigned groups,
int dummy1, int dummy2, int dummy3) {
int result;
if (argc != 5) {
Error2("%s: wrong number of parameters (%d instead of 4)",
argv[0], argc-1);
return STAT_NORETRY;
}
if ((result =
_xioopen_socket_sendto(argv[1], argv[2], argv[3], argv[4],
opts, xioflags, xxfd, groups))
!= STAT_OK) {
return result;
}
_xio_openlate(&xxfd->stream, opts);
return STAT_OK;
}
static
int _xioopen_socket_sendto(const char *pfname, const char *type,
const char *protname, const char *address,
struct opt *opts, int xioflags, xiofile_t *xxfd,
unsigned groups) {
xiosingle_t *xfd = &xxfd->stream;
char *garbage;
union sockaddr_union us = {{0}};
socklen_t uslen = 0; size_t ussize;
size_t themsize;
int pf;
int socktype = SOCK_RAW;
int proto;
bool needbind = false;
char *bindstring = NULL;
int result;
pf = strtoul(pfname, &garbage, 0);
if (*garbage != '\0') {
Warn1("garbage in parameter: \"%s\"", garbage);
}
socktype = strtoul(type, &garbage, 0);
if (*garbage != '\0') {
Warn1("garbage in parameter: \"%s\"", garbage);
}
proto = strtoul(protname, &garbage, 0);
if (*garbage != '\0') {
Warn1("garbage in parameter: \"%s\"", garbage);
}
retropt_socket_pf(opts, &pf);
retropt_int(opts, OPT_SO_TYPE, &socktype);
/*retropt_int(opts, OPT_IP_PROTOCOL, &proto);*/
xfd->howtoend = END_SHUTDOWN;
xfd->peersa.soa.sa_family = pf;
themsize = 0;
if ((result =
dalan(address, (uint8_t *)&xfd->peersa.soa.sa_data, &themsize,
sizeof(xfd->peersa), 'i'))
< 0) {
Error1("data too long: \"%s\"", address);
} else if (result > 0) {
Error1("syntax error in \"%s\"", address);
}
xfd->salen = themsize + sizeof(sa_family_t)
#if HAVE_STRUCT_SOCKADDR_SALEN
+ sizeof(xfd->peersa.soa.sa_len)
#endif
;
#if HAVE_STRUCT_SOCKADDR_SALEN
xfd->peersa.soa.sa_len =
sizeof(xfd->peersa.soa.sa_len) + sizeof(xfd->peersa.soa.sa_family) +
themsize;
#endif
/* ...res_opts[] */
if (applyopts_single(xfd, opts, PH_INIT) < 0) return -1;
applyopts(-1, opts, PH_INIT);
if (pf == PF_UNSPEC) {
pf = xfd->peersa.soa.sa_family;
}
xfd->dtype = XIODATA_RECVFROM;
if (retropt_string(opts, OPT_BIND, &bindstring) == 0) {
ussize = 0;
if ((result =
dalan(bindstring, (uint8_t *)&us.soa.sa_data, &ussize, sizeof(us), 'i'))
< 0) {
Error1("data too long: \"%s\"", bindstring);
} else if (result > 0) {
Error1("syntax error in \"%s\"", bindstring);
}
us.soa.sa_family = pf;
uslen = ussize + sizeof(sa_family_t)
#if HAVE_STRUCT_SOCKADDR_SALEN
+ sizeof(us.soa.sa_len)
#endif
;
needbind = true;
}
return
_xioopen_dgram_sendto(needbind?&us:NULL, uslen,
opts, xioflags, xfd, groups, pf, socktype, proto, 0);
}
/* we expect the form: ...:domain:socktype:protocol:local-address */
static
int xioopen_socket_recvfrom(int argc, const char *argv[], struct opt *opts,
int xioflags, xiofile_t *xxfd, unsigned groups,
int dummy, int summy2, int dummy3) {
struct single *xfd = &xxfd->stream;
const char *pfname = argv[1];
const char *typename = argv[2];
const char *protname = argv[3];
const char *address = argv[4];
char *garbage;
union sockaddr_union *us = &xfd->para.socket.la;
socklen_t uslen; size_t ussize;
int pf, socktype, proto;
char *rangename;
int result;
if (argc != 5) {
Error2("%s: wrong number of parameters (%d instead of 4)",
argv[0], argc-1);
return STAT_NORETRY;
}
pf = strtoul(pfname, &garbage, 0);
if (*garbage != '\0') {
Warn1("garbage in parameter: \"%s\"", garbage);
}
socktype = strtoul(typename, &garbage, 0);
if (*garbage != '\0') {
Warn1("garbage in parameter: \"%s\"", garbage);
}
proto = strtoul(protname, &garbage, 0);
if (*garbage != '\0') {
Warn1("garbage in parameter: \"%s\"", garbage);
}
retropt_socket_pf(opts, &pf);
retropt_int(opts, OPT_SO_TYPE, &socktype);
/*retropt_int(opts, OPT_IP_PROTOCOL, &proto);*/
xfd->howtoend = END_NONE;
ussize = 0;
if ((result =
dalan(address, (uint8_t *)&us->soa.sa_data, &ussize, sizeof(*us), 'i'))
< 0) {
Error1("data too long: \"%s\"", address);
} else if (result > 0) {
Error1("syntax error in \"%s\"", address);
}
us->soa.sa_family = pf;
uslen = ussize + sizeof(us->soa.sa_family)
#if HAVE_STRUCT_SOCKADDR_SALEN
+ sizeof(us->soa.sa_len);
#endif
;
xfd->dtype = XIOREAD_RECV|XIOWRITE_SENDTO;
if (retropt_string(opts, OPT_RANGE, &rangename) >= 0) {
if (xioparserange(rangename, 0, &xfd->para.socket.range) < 0) {
return STAT_NORETRY;
}
xfd->para.socket.dorange = true;
free(rangename);
}
if ((result =
_xioopen_dgram_recvfrom(xfd, xioflags, &us->soa, uslen,
opts, pf, socktype, proto, E_ERROR))
!= STAT_OK) {
return result;
}
_xio_openlate(xfd, opts);
return STAT_OK;
}
/* we expect the form: ...:domain:type:protocol:local-address */
static
int xioopen_socket_recv(int argc, const char *argv[], struct opt *opts,
int xioflags, xiofile_t *xxfd, unsigned groups,
int dummy1, int dummy2, int dummy3) {
struct single *xfd = &xxfd->stream;
const char *pfname = argv[1];
const char *typename = argv[2];
const char *protname = argv[3];
const char *address = argv[4];
char *garbage;
union sockaddr_union us;
socklen_t uslen; size_t ussize;
int pf, socktype, proto;
char *rangename;
int result;
if (argc != 5) {
Error2("%s: wrong number of parameters (%d instead of 4)",
argv[0], argc-1);
return STAT_NORETRY;
}
pf = strtoul(pfname, &garbage, 0);
if (*garbage != '\0') {
Warn1("garbage in parameter: \"%s\"", garbage);
}
socktype = strtoul(typename, &garbage, 0);
if (*garbage != '\0') {
Warn1("garbage in parameter: \"%s\"", garbage);
}
proto = strtoul(protname, &garbage, 0);
if (*garbage != '\0') {
Warn1("garbage in parameter: \"%s\"", garbage);
}
retropt_socket_pf(opts, &pf);
retropt_int(opts, OPT_SO_TYPE, &socktype);
/*retropt_int(opts, OPT_IP_PROTOCOL, &proto);*/
xfd->howtoend = END_NONE;
ussize = 0;
if ((result =
dalan(address, (uint8_t *)&us.soa.sa_data, &ussize, sizeof(us), 'i'))
< 0) {
Error1("data too long: \"%s\"", address);
} else if (result > 0) {
Error1("syntax error in \"%s\"", address);
}
us.soa.sa_family = pf;
uslen = ussize + sizeof(sa_family_t)
#if HAVE_STRUCT_SOCKADDR_SALEN
+sizeof(us.soa.sa_len)
#endif
;
xfd->dtype = XIOREAD_RECV;
xfd->para.socket.la.soa.sa_family = pf;
if (retropt_string(opts, OPT_RANGE, &rangename) >= 0) {
if (xioparserange(rangename, 0, &xfd->para.socket.range) < 0) {
return STAT_NORETRY;
}
xfd->para.socket.dorange = true;
free(rangename);
}
if ((result =
_xioopen_dgram_recv(xfd, xioflags, &us.soa,
uslen, opts, pf, socktype, proto, E_ERROR))
!= STAT_OK) {
return result;
}
_xio_openlate(xfd, opts);
return STAT_OK;
}
/* we expect the form: ...:domain:type:protocol:remote-address */
static
int xioopen_socket_datagram(int argc, const char *argv[], struct opt *opts,
int xioflags, xiofile_t *xxfd, unsigned groups,
int dummy1, int dummy2, int dummy3) {
xiosingle_t *xfd = &xxfd->stream;
const char *pfname = argv[1];
const char *typename = argv[2];
const char *protname = argv[3];
const char *address = argv[4];
char *garbage;
char *rangename;
size_t themsize;
int pf;
int result;
if (argc != 5) {
Error2("%s: wrong number of parameters (%d instead of 4)",
argv[0], argc-1);
return STAT_NORETRY;
}
pf = strtoul(pfname, &garbage, 0);
if (*garbage != '\0') {
Warn1("garbage in parameter: \"%s\"", garbage);
}
retropt_socket_pf(opts, &pf);
/*retropt_int(opts, OPT_IP_PROTOCOL, &proto);*/
xfd->howtoend = END_SHUTDOWN;
xfd->peersa.soa.sa_family = pf;
themsize = 0;
if ((result =
dalan(address, (uint8_t *)&xfd->peersa.soa.sa_data, &themsize,
sizeof(xfd->peersa), 'i'))
< 0) {
Error1("data too long: \"%s\"", address);
} else if (result > 0) {
Error1("syntax error in \"%s\"", address);
}
xfd->salen = themsize + sizeof(sa_family_t);
#if HAVE_STRUCT_SOCKADDR_SALEN
xfd->peersa.soa.sa_len =
sizeof(xfd->peersa.soa.sa_len) + sizeof(xfd->peersa.soa.sa_family) +
themsize;
#endif
if ((result =
_xioopen_socket_sendto(pfname, typename, protname, address,
opts, xioflags, xxfd, groups))
!= STAT_OK) {
return result;
}
xfd->dtype = XIOREAD_RECV|XIOWRITE_SENDTO;
xfd->para.socket.la.soa.sa_family = xfd->peersa.soa.sa_family;
/* which reply sockets will accept - determine by range option */
if (retropt_string(opts, OPT_RANGE, &rangename) >= 0) {
if (xioparserange(rangename, 0, &xfd->para.socket.range) < 0) {
free(rangename);
return STAT_NORETRY;
}
xfd->para.socket.dorange = true;
xfd->dtype |= XIOREAD_RECV_CHECKRANGE;
free(rangename);
}
_xio_openlate(xfd, opts);
return STAT_OK;
}
#endif /* WITH_GENERICSOCKET */
/* EINTR not handled specially */
int xiogetpacketinfo(int fd)
{
#if defined(MSG_ERRQUEUE)
int _errno = errno;
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 */
char ctrlbuff[1024]; /* ancillary messages */
struct msghdr msgh = {0};
msgh.msg_name = pa;
msgh.msg_namelen = palen;
#if HAVE_STRUCT_MSGHDR_MSGCONTROL
msgh.msg_control = ctrlbuff;
#endif
#if HAVE_STRUCT_MSGHDR_MSGCONTROLLEN
msgh.msg_controllen = sizeof(ctrlbuff);
#endif
if (xiogetpacketsrc(fd,
&msgh,
MSG_ERRQUEUE
#ifdef MSG_TRUNC
|MSG_TRUNC
#endif
) >= 0
) {
palen = msgh.msg_namelen;
Notice1("receiving packet from %s"/*"src"*/,
sockaddr_info(&pa->soa, palen, peername, sizeof(peername))/*,
sockaddr_info(&la->soa, sockname, sizeof(sockname))*/);
xiodopacketinfo(&msgh, true, true);
}
errno = _errno;
#endif /* defined(MSG_ERRQUEUE) */
return 0;
}
/* A subroutine that is common to all socket addresses that want to connect()
a socket to a peer.
Applies and consumes the following options:
PH_PASTSOCKET, PH_FD, PH_PREBIND, PH_BIND, PH_PASTBIND, PH_CONNECT,
PH_CONNECTED, PH_LATE,
OFUNC_OFFSET,
OPT_SO_TYPE, OPT_SO_PROTOTYPE, OPT_USER, OPT_GROUP, OPT_CLOEXEC
Does not fork, does not retry.
returns 0 on success.
*/
int _xioopen_connect(struct single *xfd, union sockaddr_union *us, size_t uslen,
struct sockaddr *them, size_t themlen,
struct opt *opts, int pf, int socktype, int protocol,
bool alt, int level) {
int fcntl_flags = 0;
char infobuff[256];
union sockaddr_union la;
socklen_t lalen = themlen;
int _errno;
int result;
#if WITH_UNIX
if (pf == PF_UNIX && us != NULL) {
applyopts_named(us->un.sun_path, opts, PH_EARLY);
}
#endif
if ((xfd->fd = xiosocket(opts, pf, socktype, protocol, level)) < 0) {
return STAT_RETRYLATER;
}
applyopts_offset(xfd, opts);
applyopts(xfd->fd, opts, PH_PASTSOCKET);
applyopts(xfd->fd, opts, PH_FD);
applyopts_cloexec(xfd->fd, opts);
if (xiobind(xfd, us, uslen, opts, pf, alt, level) < 0) {
return -1;
}
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, 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;
struct pollfd writefd;
int err;
socklen_t errlen = sizeof(err);
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;
writefd.fd = xfd->fd;
writefd.events = (POLLOUT|POLLERR);
result = xiopoll(&writefd, 1, &timeout);
if (result < 0) {
Msg4(level, "xiopoll({%d,POLLOUT|POLLERR},,{"F_tv_sec"."F_tv_usec"): %s",
xfd->fd, timeout.tv_sec, timeout.tv_usec, 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 (writefd.revents & POLLERR) {
#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 or network error */
result = Getsockopt(xfd->fd, SOL_SOCKET, SO_ERROR, &err, &errlen);
if (result != 0) {
Msg2(level, "getsockopt(%d, SOL_SOCKET, SO_ERROR, ...): %s",
xfd->fd, strerror(err));
return STAT_RETRYLATER;
}
Debug2("getsockopt(%d, SOL_SOCKET, SO_ERROR, { %d }) -> 0",
xfd->fd, err);
if (err != 0) {
Msg4(level, "connect(%d, %s, "F_Zd"): %s",
xfd->fd, sockaddr_info(them, themlen, infobuff, sizeof(infobuff)),
themlen, strerror(err));
return STAT_RETRYLATER;
}
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) {
/* this is for UNIX domain sockets: a connect attempt seems to be
the only way to distinguish stream and datagram sockets.
And no ancillary message expected
*/
int _errno = errno;
Info4("connect(%d, %s, "F_Zd"): %s",
xfd->fd, sockaddr_info(them, themlen, infobuff, sizeof(infobuff)),
themlen, strerror(errno));
/* caller must handle this condition */
Close(xfd->fd); xfd->fd = -1;
errno = _errno;
return STAT_RETRYLATER;
} else {
/* try to find details about error, especially from ICMP */
xiogetpacketinfo(xfd->fd);
/* continue mainstream */
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;
}
} else { /* result >= 0 */
Notice1("successfully connected from local address %s",
sockaddr_info(&la.soa, themlen, infobuff, sizeof(infobuff)));
}
applyopts_fchown(xfd->fd, opts); /* OPT_USER, OPT_GROUP */
applyopts(xfd->fd, opts, PH_CONNECTED);
#if WITH_UNIX
if (pf == PF_UNIX && us != NULL) {
applyopts_named(us->un.sun_path, opts, PH_LATE);
}
#endif
applyopts(xfd->fd, opts, PH_LATE);
return STAT_OK;
}
/* a subroutine that is common to all socket addresses that want to connect
to a peer address.
might fork.
applies and consumes the following option:
PH_PASTSOCKET, PH_FD, PH_PREBIND, PH_BIND, PH_PASTBIND, PH_CONNECT,
PH_CONNECTED, PH_LATE,
OFUNC_OFFSET,
OPT_FORK, OPT_SO_TYPE, OPT_SO_PROTOTYPE, OPT_USER, OPT_GROUP, OPT_CLOEXEC
returns 0 on success.
*/
int xioopen_connect(struct single *xfd, union sockaddr_union *us, size_t uslen,
struct sockaddr *them, size_t themlen,
struct opt *opts, int pf, int socktype, int protocol,
bool alt) {
bool dofork = false;
struct opt *opts0;
char infobuff[256];
int level;
int result;
retropt_bool(opts, OPT_FORK, &dofork);
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, socktype, protocol, 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 (dofork) {
xiosetchilddied(); /* set SIGCHLD handler */
}
#if WITH_RETRY
if (dofork) {
pid_t pid;
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 */
}
while ((pid = xio_fork(false, level)) < 0) {
--xfd->retry;
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 */
break;
}
/* parent process */
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
applies and consumes the following option:
PH_PASTSOCKET, PH_FD, PH_PREBIND, PH_BIND, PH_PASTBIND, PH_CONNECTED, PH_LATE
OFUNC_OFFSET
OPT_SO_TYPE, OPT_SO_PROTOTYPE, OPT_USER, OPT_GROUP, OPT_CLOEXEC
*/
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, bool alt) {
int level = E_ERROR;
union sockaddr_union la; socklen_t lalen = sizeof(la);
char infobuff[256];
#if WITH_UNIX
if (pf == PF_UNIX && us != NULL) {
applyopts_named(us->un.sun_path, opts, PH_EARLY);
}
#endif
if ((xfd->fd = xiosocket(opts, pf, socktype, ipproto, level)) < 0) {
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);
if (xiobind(xfd, us, uslen, opts, pf, alt, level) < 0) {
return -1;
}
/*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);
#if WITH_UNIX
if (pf == PF_UNIX && us != NULL) {
applyopts_named(us->un.sun_path, opts, PH_LATE);
}
#endif
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;
}
/* when the recvfrom address (with option fork) receives a packet it keeps this
packet in the IP stacks input queue and forks a sub process. The sub process
then reads this packet for processing its data.
There is a problem because the parent process would find the same packet
again if it calls select()/poll() before the child process reads the
packet.
To solve this problem we implement the following mechanism:
The sub process sends a SIGUSR1 when it has read the packet (or a SIGCHLD if
it dies before). The parent process waits until it receives that signal and
only then continues to listen.
To prevent a signal from another process to trigger our loop, we pass the
pid of the sub process to the signal handler in xio_waitingfor. The signal
handler sets xio_hashappened if the pid matched.
*/
static pid_t xio_waitingfor; /* info from recv loop to signal handler:
indicates the pid of the child process
that should send us the USR1 signal */
static bool xio_hashappened; /* info from signal handler to loop: child
process has read ("consumed") the packet */
static int xio_childstatus;
/* this is the signal handler for USR1 and CHLD */
void xiosigaction_hasread(int signum
#if HAVE_STRUCT_SIGACTION_SA_SIGACTION && defined(SA_SIGINFO)
, siginfo_t *siginfo, void *ucontext
#endif
) {
pid_t pid;
int _errno;
int status = 0;
bool wassig = false;
_errno = errno;
diag_in_handler = 1;
#if HAVE_STRUCT_SIGACTION_SA_SIGACTION && defined(SA_SIGINFO)
Debug5("xiosigaction_hasread(%d, {%d,%d,%d,"F_pid"}, )",
signum, siginfo->si_signo, siginfo->si_errno, siginfo->si_code,
siginfo->si_pid);
#else
Debug1("xiosigaction_hasread(%d)", signum);
#endif
if (signum == SIGCHLD) {
do {
pid = Waitpid(-1, &status, WNOHANG);
if (pid == 0) {
Msg(wassig?E_INFO:E_WARN,
"waitpid(-1, {}, WNOHANG): no child has exited");
Info("xiosigaction_hasread() finished");
Debug("xiosigaction_hasread() ->");
diag_in_handler = 0;
errno = _errno;
return;
} else if (pid < 0 && errno == ECHILD) {
Msg(wassig?E_INFO:E_WARN,
"waitpid(-1, {}, WNOHANG): "F_strerror);
Info("xiosigaction_hasread() finished");
Debug("xiosigaction_hasread() ->");
diag_in_handler = 0;
errno = _errno;
return;
}
wassig = true;
if (pid < 0) {
Warn1("waitpid(-1, {%d}, WNOHANG): "F_strerror, status);
Info("xiosigaction_hasread() finished");
Debug("xiosigaction_hasread() ->");
diag_in_handler = 0;
errno = _errno;
return;
}
if (pid == xio_waitingfor) {
xio_waitingfor = 0; /* so this child will not set hashappened again */
xio_hashappened = true;
xio_childstatus = WEXITSTATUS(status);
Debug("xiosigaction_hasread() ->");
diag_in_handler = 0;
errno = _errno;
return;
}
} while (1);
}
#if HAVE_STRUCT_SIGACTION_SA_SIGACTION && defined(SA_SIGINFO)
if (xio_waitingfor == siginfo->si_pid) {
xio_hashappened = true;
}
#else
xio_hashappened = true;
#endif
#if !HAVE_SIGACTION
Signal(sig, xiosigaction_hasread);
#endif /* !HAVE_SIGACTION */
Debug("xiosigaction_hasread() ->");
diag_in_handler = 0;
errno = _errno;
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
applies and consumes the following options:
PH_INIT, PH_PREBIND, PH_BIND, PH_PASTBIND, PH_EARLY, PH_PREOPEN, PH_FD,
PH_CONNECTED, PH_LATE, PH_LATE2
OPT_FORK, OPT_SO_TYPE, OPT_SO_PROTOTYPE, cloexec, OPT_RANGE, tcpwrap
EINTR is not handled specially.
*/
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;
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 ((xfd->fd = xiosocket(opts, pf, socktype, proto, level)) < 0) {
return STAT_RETRYLATER;
}
applyopts_single(xfd, opts, PH_PASTSOCKET);
applyopts(xfd->fd, opts, PH_PASTSOCKET);
applyopts_cloexec(xfd->fd, opts);
if (xiobind(xfd, (union sockaddr_union *)us, uslen,
opts, pf, 0, level) < 0) {
return -1;
}
applyopts(xfd->fd, opts, PH_PASTBIND);
#if WITH_UNIX
if (pf == AF_UNIX && us != NULL) {
applyopts_named(((struct sockaddr_un *)us)->sun_path, opts, PH_FD);
/*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 */
/* for generic sockets, this has already been retrieved */
if (retropt_string(opts, OPT_RANGE, &rangename) >= 0) {
if (xioparserange(rangename, pf, &xfd->para.socket.range)
< 0) {
free(rangename);
return STAT_NORETRY;
}
free(rangename);
xfd->para.socket.dorange = true;
}
#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 HAVE_STRUCT_SIGACTION_SA_SIGACTION && defined(SA_SIGINFO)
act.sa_sigaction = xiosigaction_hasread;
#else /* Linux 2.0(.33) does not have sigaction.sa_sigaction */
act.sa_handler = xiosigaction_hasread;
#endif
sigfillset(&act.sa_mask);
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 */
char ctrlbuff[1024]; /* ancillary messages */
struct msghdr msgh = {0};
int rc;
socket_init(pf, pa);
if (drop) {
char *dummy[2];
Recv(xfd->fd, dummy, sizeof(dummy), 0);
drop = true;
}
Info("Recvfrom: Checking/waiting for next packet");
/* loop until select()/poll() returns valid */
do {
struct pollfd readfd;
/*? 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);
}
readfd.fd = xfd->fd;
readfd.events = POLLIN;
if (xiopoll(&readfd, 1, NULL) > 0) {
break;
}
if (errno == EINTR) {
continue;
}
Msg2(level, "poll({%d,,},,-1): %s", xfd->fd, strerror(errno));
Close(xfd->fd);
return STAT_RETRYLATER;
} while (true);
msgh.msg_name = pa;
msgh.msg_namelen = palen;
#if HAVE_STRUCT_MSGHDR_MSGCONTROL
msgh.msg_control = ctrlbuff;
#endif
#if HAVE_STRUCT_MSGHDR_MSGCONTROLLEN
msgh.msg_controllen = sizeof(ctrlbuff);
#endif
while ((rc = xiogetpacketsrc(xfd->fd,
&msgh,
MSG_PEEK
#ifdef MSG_TRUNC
|MSG_TRUNC
#endif
)) < 0 &&
errno == EINTR) ;
if (rc < 0) return STAT_RETRYLATER;
palen = msgh.msg_namelen;
Notice1("receiving packet from %s"/*"src"*/,
sockaddr_info(&pa->soa, palen, peername, sizeof(peername))/*,
sockaddr_info(&la->soa, sockname, sizeof(sockname))*/);
xiodopacketinfo(&msgh, true, true);
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(&pa->soa, palen,
infobuff, sizeof(infobuff)));
/* set the env vars describing the local and remote sockets */
/*xiosetsockaddrenv("SOCK", la, lalen, proto);*/
xiosetsockaddrenv("PEER", pa, palen, proto);
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 oldset, mask_sigchldusr1;
/* 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 */
Sigprocmask(SIG_BLOCK, NULL, &mask_sigchldusr1);
sigaddset(&mask_sigchldusr1, SIGCHLD);
sigaddset(&mask_sigchldusr1, SIGUSR1);
Sigprocmask(SIG_SETMASK, &mask_sigchldusr1, &oldset);
if ((pid = xio_fork(false, level)) < 0) {
Close(xfd->fd);
Sigprocmask(SIG_SETMASK, &oldset, NULL);
return STAT_RETRYLATER;
}
if (pid == 0) { /* child */
/* no reason to block SIGCHLD in child process */
Sigprocmask(SIG_SETMASK, &oldset, 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 */
#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;
}
xio_waitingfor = pid;
do {
#if HAVE_PSELECT
{
struct timespec timeout = { LONG_MAX, 0 };
Pselect(0, NULL, NULL, NULL, &timeout, &oldset);
Sigprocmask(SIG_SETMASK, &oldset, NULL);
}
#else /* ! HAVE_PSELECT */
/* now we are ready to handle signals */
Sigprocmask(SIG_SETMASK, &oldset, NULL);
Sleep(1); /* any signal speeds up return */
#endif /* ! HAVE_PSELECT */
} while (!xio_hashappened) ;
xio_hashappened = false;
if (xio_childstatus != 0) {
char buff[512];
Recv(xfd->fd, buff, sizeof(buff), 0);
xio_childstatus = 0;
Info("drop data because of child exit failed");
}
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;
if (applyopts_single(xfd, opts, PH_INIT) < 0) return STAT_NORETRY;
if ((xfd->fd = xiosocket(opts, pf, socktype, proto, level)) < 0) {
return STAT_RETRYLATER;
}
applyopts_single(xfd, opts, PH_PASTSOCKET);
applyopts(xfd->fd, opts, PH_PASTSOCKET);
applyopts_cloexec(xfd->fd, opts);
if (xiobind(xfd, (union sockaddr_union *)us, uslen, opts, pf, 0, level) < 0) {
return -1;
}
#if WITH_UNIX
if (pf == AF_UNIX && us != NULL) {
applyopts_named(((struct sockaddr_un *)us)->sun_path, opts, PH_FD);
/*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 (xioparserange(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 (isdigit(pfname[0])) {
*pf = strtoul(pfname, NULL /*!*/, 0);
#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;
}
/* This function calls recvmsg(..., MSG_PEEK, ...) to obtain information about
the arriving packet, thus it does not "consume" the packet.
In msgh the msg_name pointer must refer to an (empty) sockaddr storage.
Returns STAT_OK on success, or STAT_RETRYLATER when an error occurred,
including EINTR.
*/
int xiogetpacketsrc(int fd, struct msghdr *msgh, int flags) {
char peekbuff[1];
#if HAVE_STRUCT_IOVEC
struct iovec iovec;
#endif
#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_MSGFLAGS
msgh->msg_flags = 0;
#endif
if (Recvmsg(fd, msgh, flags) < 0) {
Warn1("recvmsg(): %s", strerror(errno));
return STAT_RETRYLATER;
}
return STAT_OK;
}
/* works through the ancillary messages found in the given socket header record
and logs the relevant information (E_DEBUG, E_INFO).
calls protocol/layer specific functions for handling the messages
creates appropriate environment vars if withenv is set */
int xiodopacketinfo(struct msghdr *msgh, bool withlog, bool withenv) {
#if defined(HAVE_STRUCT_CMSGHDR) && defined(CMSG_DATA)
struct cmsghdr *cmsg;
/* parse ancillary messages */
cmsg = CMSG_FIRSTHDR(msgh);
while (cmsg != NULL) {
int num = 0; /* number of data components of a ancill.msg */
int i;
char typbuff[16], *typp;
char nambuff[128], *namp;
char valbuff[256], *valp;
char envbuff[256], *envp;
if (withlog) {
xiodump(CMSG_DATA(cmsg),
cmsg->cmsg_len-((char *)CMSG_DATA(cmsg)-(char *)cmsg),
valbuff, sizeof(valbuff)-1, 0);
Debug4("ancillary message: len="F_cmsg_len", level=%d, type=%d, data=%s",
cmsg->cmsg_len, cmsg->cmsg_level, cmsg->cmsg_type,
valbuff);
}
/* try to get the anc.msg. contents in handy components, protocol/level
dependent */
switch (cmsg->cmsg_level) {
case SOL_SOCKET:
xiolog_ancillary_socket(cmsg, &num, typbuff, sizeof(typbuff)-1,
nambuff, sizeof(nambuff)-1,
envbuff, sizeof(envbuff)-1,
valbuff, sizeof(valbuff)-1);
break;
#if WITH_IP4 || WITH_IP6
case SOL_IP:
xiolog_ancillary_ip(cmsg, &num, typbuff, sizeof(typbuff)-1,
nambuff, sizeof(nambuff)-1,
envbuff, sizeof(envbuff)-1,
valbuff, sizeof(valbuff)-1);
break;
#endif /* WITH_IP4 || WITH_IP6 */
#if WITH_IP6
case SOL_IPV6:
xiolog_ancillary_ip6(cmsg, &num, typbuff, sizeof(typbuff)-1,
nambuff, sizeof(nambuff)-1,
envbuff, sizeof(envbuff)-1,
valbuff, sizeof(valbuff)-1);
break;
#endif /* WITH_IP6 */
default:
num = 1;
snprintf(typbuff, sizeof(typbuff)-1, "LEVEL%u", cmsg->cmsg_level);
snprintf(nambuff, sizeof(nambuff)-1, "type%u", cmsg->cmsg_type);
xiodump(CMSG_DATA(cmsg),
cmsg->cmsg_len-((char *)CMSG_DATA(cmsg)-(char *)cmsg),
valbuff, sizeof(valbuff)-1, 0);
}
/* here the info is in typbuff (one string), nambuff (num consecutive
strings), and valbuff (num consecutive strings) */
i = 0;
typp = typbuff; namp = nambuff; envp = envbuff; valp = valbuff;
while (i < num) {
if (withlog) {
Info3("ancillary message: %s: %s=%s", typp, namp, valp);
}
if (withenv) {
if (*envp) {
xiosetenv(envp, valp, 1, NULL);
} else if (!strcasecmp(typp+strlen(typp)-strlen(namp), namp)) {
xiosetenv(typp, valp, 1, NULL);
} else {
xiosetenv2(typp, namp, valp, 1, NULL);
}
}
if (++i == num) break;
namp = strchr(namp, '\0')+1;
envp = strchr(envp, '\0')+1;
valp = strchr(valp, '\0')+1;
}
cmsg = CMSG_NXTHDR(msgh, cmsg);
}
return 0;
#else /* !(defined(HAVE_STRUCT_CMSGHDR) && defined(CMSG_DATA)) */
return -1;
#endif /* !(defined(HAVE_STRUCT_CMSGHDR) && defined(CMSG_DATA)) */
}
/* check if peer address is within permitted range.
return >= 0 if so. */
int xiocheckrange(union sockaddr_union *sa, struct xiorange *range) {
switch (sa->soa.sa_family) {
#if WITH_IP4
case PF_INET:
return
xiocheckrange_ip4(&sa->ip4, range);
#endif /* WITH_IP4 */
#if WITH_IP6
case PF_INET6:
return
xiocheckrange_ip6(&sa->ip6, range);
#endif /* WITH_IP6 */
#if 0
case PF_UNSPEC:
{
socklen_t i;
for (i = 0; i < sizeof(sa->soa.sa_data); ++i) {
if ((range->netmask.soa.sa_data[i] & sa->soa.sa_data[i]) != range->netaddr.soa.sa_data[i]) {
return -1;
}
}
return 0;
}
#endif
}
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 (pa == NULL) { return -1; }
if (xiocheckrange(pa, &xfd->para.socket.range) < 0) {
char infobuff[256];
Warn1("refusing connection from %s due to range option",
sockaddr_info(&pa->soa, 0,
infobuff, sizeof(infobuff)));
return -1;
}
Info1("permitting connection from %s due to range option",
sockaddr_info(&pa->soa, 0,
infobuff, sizeof(infobuff)));
}
#endif /* WITH_IP4 */
#if WITH_TCP || WITH_UDP
if (xfd->para.socket.ip.dosourceport) {
if (pa == NULL) { return -1; }
#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(&pa->soa, 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 wrong sourceport",
sockaddr_info(&pa->soa, 0,
infobuff, sizeof(infobuff)));
return -1;
}
#endif /* WITH_IP6 */
Info1("permitting connection from %s due to sourceport option",
sockaddr_info(&pa->soa, 0,
infobuff, sizeof(infobuff)));
} else if (xfd->para.socket.ip.lowport) {
if (pa == NULL) { return -1; }
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(&pa->soa, 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(&pa->soa, 0,
infobuff, sizeof(infobuff)));
return -1;
}
#endif /* WITH_IP6 */
Info1("permitting connection from %s due to lowport option",
sockaddr_info(&pa->soa, 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(&pa->soa, 0,
infobuff, sizeof(infobuff)));
return -1;
} else if (result > 0) {
Info1("permitting connection from %s due to tcpwrapper option",
sockaddr_info(&pa->soa, 0,
infobuff, sizeof(infobuff)));
}
#endif /* (WITH_TCP || WITH_UDP) && WITH_LIBWRAP */
return 0; /* permitted */
}
#if HAVE_STRUCT_CMSGHDR
/* converts the ancillary message in *cmsg into a form useable for further
processing. knows the specifics of common message types.
returns the number of resulting syntax elements in *num
returns a sequence of \0 terminated type strings in *typbuff
returns a sequence of \0 terminated name strings in *nambuff
returns a sequence of \0 terminated value strings in *valbuff
the respective len parameters specify the available space in the buffers
returns STAT_OK or other STAT_*
*/
static int
xiolog_ancillary_socket(struct cmsghdr *cmsg, int *num,
char *typbuff, int typlen,
char *nambuff, int namlen,
char *envbuff, int envlen,
char *valbuff, int vallen) {
const char *cmsgtype, *cmsgname, *cmsgenvn;
size_t msglen;
struct timeval *tv;
int rc = STAT_OK;
#if defined(CMSG_DATA)
msglen = cmsg->cmsg_len-((char *)CMSG_DATA(cmsg)-(char *)cmsg);
switch (cmsg->cmsg_type) {
#ifdef SO_PASSCRED
case SO_PASSCRED: /* this is really a UNIX/LOCAL message */
/*! needs implementation */
#endif /* SO_PASSCRED */
#ifdef SO_RIGHTS
case SO_RIGHTS: /* this is really a UNIX/LOCAL message */
/*! needs implementation */
#endif
default: /* binary data */
snprintf(typbuff, typlen, "SOCKET.%u", cmsg->cmsg_type);
nambuff[0] = '\0'; strncat(nambuff, "data", namlen-1);
xiodump(CMSG_DATA(cmsg), msglen, valbuff, vallen, 0);
return STAT_OK;
#ifdef SO_TIMESTAMP
# ifdef SCM_TIMESTAMP
case SCM_TIMESTAMP:
# else
case SO_TIMESTAMP:
# endif
tv = (struct timeval *)CMSG_DATA(cmsg);
cmsgtype =
#ifdef SCM_TIMESTAMP
"SCM_TIMESTAMP" /* FreeBSD */
#else
"SO_TIMESTAMP" /* Linux */
#endif
;
cmsgname = "timestamp";
cmsgenvn = "TIMESTAMP";
{ time_t t = tv->tv_sec; ctime_r(&t, valbuff); }
snprintf(strchr(valbuff, '\0')-1/*del \n*/, vallen-strlen(valbuff)+1, ", %06ld usecs", (long)tv->tv_usec);
break;
#endif /* defined(SO_TIMESTAMP) */
;
}
/* when we come here we provide a single parameter
with type in cmsgtype, name in cmsgname,
and value already in valbuff */
*num = 1;
if (strlen(cmsgtype) >= typlen) rc = STAT_WARNING;
typbuff[0] = '\0'; strncat(typbuff, cmsgtype, typlen-1);
if (strlen(cmsgname) >= namlen) rc = STAT_WARNING;
nambuff[0] = '\0'; strncat(nambuff, cmsgname, namlen-1);
if (strlen(cmsgenvn) >= envlen) rc = STAT_WARNING;
envbuff[0] = '\0'; strncat(envbuff, cmsgenvn, envlen-1);
return rc;
#else /* !defined(CMSG_DATA) */
return STAT_NORETRY;
#endif /* !defined(CMSG_DATA) */
}
#endif /* HAVE_STRUCT_CMSGHDR */
/* return the name of the interface with given index
or NULL if is fails
The system call requires an arbitrary socket; the calling program may
provide one in parameter ins to avoid creation of a dummy socket. ins must
be <0 if it does not specify a socket fd. */
char *xiogetifname(int ind, char *val, int ins) {
#if !HAVE_PROTOTYPE_LIB_if_indextoname
int s;
struct ifreq ifr;
if (ins >= 0) {
s = ins;
} else {
if ((s = Socket(PF_INET, SOCK_DGRAM, IPPROTO_IP)) < 0) {
Error1("socket(PF_INET, SOCK_DGRAM, IPPROTO_IP): %s", strerror(errno));
return NULL;
}
}
#if HAVE_STRUCT_IFREQ_IFR_INDEX
ifr.ifr_index = ind;
#elif HAVE_STRUCT_IFREQ_IFR_IFINDEX
ifr.ifr_ifindex = ind;
#endif
#ifdef SIOCGIFNAME
if(Ioctl(s, SIOCGIFNAME, &ifr) < 0) {
#if HAVE_STRUCT_IFREQ_IFR_INDEX
Info3("ioctl(%d, SIOCGIFNAME, {..., ifr_index=%d, ...}: %s",
s, ifr.ifr_index, strerror(errno));
#elif HAVE_STRUCT_IFREQ_IFR_IFINDEX
Info3("ioctl(%d, SIOCGIFNAME, {..., ifr_ifindex=%d, ...}: %s",
s, ifr.ifr_ifindex, strerror(errno));
#endif
if (ins < 0) Close(s);
return NULL;
}
#endif /* SIOCGIFNAME */
if (ins < 0) Close(s);
strcpy(val, ifr.ifr_name);
return val;
#else /* HAVE_PROTOTYPE_LIB_if_indextoname */
return if_indextoname(ind, val);
#endif /* HAVE_PROTOTYPE_LIB_if_indextoname */
}
/* parses a network specification consisting of an address and a mask. */
int xioparsenetwork(const char *rangename, int pf, struct xiorange *range) {
size_t addrlen = 0, masklen = 0;
int result;
switch (pf) {
#if WITH_IP4
case PF_INET:
return xioparsenetwork_ip4(rangename, range);
break;
#endif /* WITH_IP4 */
#if WITH_IP6
case PF_INET6:
return xioparsenetwork_ip6(rangename, range);
break;
#endif /* WITH_IP6 */
case PF_UNSPEC:
{
char *addrname;
const char *maskname;
if ((maskname = strchr(rangename, ':')) == NULL) {
Error1("syntax error in range \"%s\": use <addr>:<mask>", rangename);
return STAT_NORETRY;
}
++maskname; /* skip ':' */
if ((addrname = Malloc(maskname-rangename)) == NULL) {
return STAT_NORETRY;
}
strncpy(addrname, rangename, maskname-rangename-1); /* ok */
addrname[maskname-rangename-1] = '\0';
result =
dalan(addrname, (uint8_t *)&range->netaddr.soa.sa_data, &addrlen,
sizeof(range->netaddr)-(size_t)(&((struct sockaddr *)0)->sa_data)
/* data length */, 'i');
if (result < 0) {
Error1("data too long: \"%s\"", addrname);
free(addrname); return STAT_NORETRY;
} else if (result > 0) {
Error1("syntax error in \"%s\"", addrname);
free(addrname); return STAT_NORETRY;
}
free(addrname);
result =
dalan(maskname, (uint8_t *)&range->netmask.soa.sa_data, &masklen,
sizeof(range->netaddr)-(size_t)(&((struct sockaddr *)0)->sa_data)
/* data length */, 'i');
if (result < 0) {
Error1("data too long: \"%s\"", maskname);
return STAT_NORETRY;
} else if (result > 0) {
Error1("syntax error in \"%s\"", maskname);
return STAT_NORETRY;
}
if (addrlen != masklen) {
Error2("network address is "F_Zu" bytes long, mask is "F_Zu" bytes long",
addrlen, masklen);
/* recover by padding the shorter component with 0 */
memset((char *)&range->netaddr.soa.sa_data+addrlen, 0,
MAX(0, addrlen-masklen));
memset((char *)&range->netmask.soa.sa_data+masklen, 0,
MAX(0, masklen-addrlen));
}
}
break;
default:
Error1("range option not supported with address family %d", pf);
return STAT_NORETRY;
}
return STAT_OK;
}
/* parses a string of form address/bits or address:mask, and fills the fields
of the range union. The addr component is masked with mask. */
int xioparserange(const char *rangename, int pf, struct xiorange *range) {
int i;
if (xioparsenetwork(rangename, pf, range) < 0) {
return -1;
}
/* we have parsed the address and mask; now we make sure that the stored
address has 0 where mask is 0, to simplify comparisions */
switch (pf) {
#if WITH_IP4
case PF_INET:
range->netaddr.ip4.sin_addr.s_addr &= range->netmask.ip4.sin_addr.s_addr;
break;
#endif /* WITH_IP4 */
#if WITH_IP6
case PF_INET6:
return xiorange_ip6andmask(range);
break;
#endif /* WITH_IP6 */
case PF_UNSPEC:
for (i = 0; i < sizeof(range->netaddr); ++i) {
((char *)&range->netaddr)[i] &= ((char *)&range->netmask)[i];
}
break;
default:
Error1("range option not supported with address family %d", pf);
return STAT_NORETRY;
}
return 0;
}
/* set environment variables describing (part of) a socket address, e.g.
SOCAT_SOCKADDR. lr (local/remote) specifies a string like "SOCK" or "PEER".
proto should correspond to the third parameter of socket(2) and is used to
determine the presence of port information. */
int xiosetsockaddrenv(const char *lr,
union sockaddr_union *sau, socklen_t salen,
int proto) {
# define XIOSOCKADDRENVLEN 256
char namebuff[XIOSOCKADDRENVLEN];
char valuebuff[XIOSOCKADDRENVLEN];
int idx = 0, result;
strcpy(namebuff, lr);
switch (sau->soa.sa_family) {
#if WITH_UNIX
case PF_UNIX:
result =
xiosetsockaddrenv_unix(idx, strchr(namebuff, '\0'), XIOSOCKADDRENVLEN-strlen(lr),
valuebuff, XIOSOCKADDRENVLEN,
&sau->un, salen, proto);
xiosetenv(namebuff, valuebuff, 1, NULL);
break;
#endif /* WITH_UNIX */
#if WITH_IP4
case PF_INET:
do {
result =
xiosetsockaddrenv_ip4(idx, strchr(namebuff, '\0'), XIOSOCKADDRENVLEN-strlen(lr),
valuebuff, XIOSOCKADDRENVLEN,
&sau->ip4, proto);
xiosetenv(namebuff, valuebuff, 1, NULL);
namebuff[strlen(lr)] = '\0'; ++idx;
} while (result > 0);
break;
#endif /* WITH_IP4 */
#if WITH_IP6
case PF_INET6:
strcpy(namebuff, lr);
do {
result =
xiosetsockaddrenv_ip6(idx, strchr(namebuff, '\0'), XIOSOCKADDRENVLEN-strlen(lr),
valuebuff, XIOSOCKADDRENVLEN,
&sau->ip6, proto);
xiosetenv(namebuff, valuebuff, 1, NULL);
namebuff[strlen(lr)] = '\0'; ++idx;
} while (result > 0);
break;
#endif /* WITH_IP6 */
#if LATER
case PF_PACKET:
result = xiosetsockaddrenv_packet(lr, (void *)sau, proto); break;
#endif
default:
result = -1;
break;
}
return result;
# undef XIOSOCKADDRENVLEN
}
#endif /* _WITH_SOCKET */
/* these do sockets internally */
/* retrieves options so-type and so-prototype from opts, calls socket, and
ev. generates an appropriate error message.
returns 0 on success or -1 if an error occurred. */
int
xiosocket(struct opt *opts, int pf, int socktype, int proto, int msglevel) {
int result;
retropt_int(opts, OPT_SO_TYPE, &socktype);
retropt_int(opts, OPT_SO_PROTOTYPE, &proto);
result = Socket(pf, socktype, proto);
if (result < 0) {
int _errno = errno;
Msg4(msglevel, "socket(%d, %d, %d): %s",
pf, socktype, proto, strerror(errno));
errno = _errno;
return -1;
}
return result;
}
/* retrieves options so-type and so-prototype from opts, calls socketpair, and
ev. generates an appropriate error message.
returns 0 on success or -1 if an error occurred. */
int
xiosocketpair(struct opt *opts, int pf, int socktype, int proto, int sv[2]) {
int result;
retropt_int(opts, OPT_SO_TYPE, &socktype);
retropt_int(opts, OPT_SO_PROTOTYPE, &proto);
result = Socketpair(pf, socktype, proto, sv);
if (result < 0) {
Error5("socketpair(%d, %d, %d, %p): %s",
pf, socktype, proto, sv, strerror(errno));
return -1;
}
return result;
}
int xiobind(
struct single *xfd,
union sockaddr_union *us,
size_t uslen,
struct opt *opts,
int pf,
bool alt,
int level)
{
char infobuff[256];
int result;
#if WITH_UNIX
if (pf == PF_UNIX && us != NULL) {
applyopts_named(us->un.sun_path, opts, PH_PREOPEN);
}
#endif
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;
/* prepare sockaddr for bind probing */
if (us) {
sinp = us;
} else {
if (pf == AF_INET) {
socket_in_init(&sin.ip4);
#if WITH_IP6
} else {
socket_in6_init(&sin.ip6);
#endif
}
sinp = &sin;
}
if (pf == AF_INET) {
port = &sin.ip4.sin_port;
#if WITH_IP6
} else if (pf == 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
}
/* Note: IPPORT_RESERVED is from includes, 1024 */
dv = div(random(), IPPORT_RESERVED-XIO_IPPORT_LOWER);
i = N = XIO_IPPORT_LOWER + dv.rem;
do { /* loop over lowport bind() attempts */
*port = htons(i);
if (Bind(xfd->fd, &sinp->soa, 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 WITH_UNIX
if (pf == PF_UNIX && us != NULL) {
applyopts_named(us->un.sun_path, opts, PH_PREOPEN);
}
#endif
if (Bind(xfd->fd, &us->soa, uslen) < 0) {
Msg4(level, "bind(%d, {%s}, "F_Zd"): %s",
xfd->fd, sockaddr_info(&us->soa, uslen, infobuff, sizeof(infobuff)),
uslen, strerror(errno));
Close(xfd->fd);
return STAT_RETRYLATER;
}
}
#if WITH_UNIX
if (pf == PF_UNIX && us != NULL) {
applyopts_named(us->un.sun_path, opts, PH_PASTOPEN);
}
#endif
applyopts(xfd->fd, opts, PH_PASTBIND);
return 0;
}
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