2 * Unix networking abstraction.
11 #include <sys/types.h>
12 #include <sys/socket.h>
13 #include <sys/ioctl.h>
14 #include <arpa/inet.h>
15 #include <netinet/in.h>
16 #include <netinet/tcp.h>
20 #define DEFINE_PLUG_METHOD_MACROS
25 /* Solaris needs <sys/sockio.h> for SIOCATMARK. */
27 #include <sys/sockio.h>
31 # define X11_UNIX_PATH "/tmp/.X11-unix/X"
35 struct socket_function_table *fn;
36 /* the above variable absolutely *must* be the first in this structure */
42 int connected; /* irrelevant for listening sockets */
44 int frozen; /* this causes readability notifications to be ignored */
45 int frozen_readable; /* this means we missed at least one readability
46 * notification while we were frozen */
47 int localhost_only; /* for listening sockets */
50 int oobpending; /* is there OOB data available to read? */
52 int pending_error; /* in case send() returns error */
54 int nodelay, keepalive; /* for connect()-type sockets */
55 int privport, port; /* and again */
60 * We used to typedef struct Socket_tag *Socket.
62 * Since we have made the networking abstraction slightly more
63 * abstract, Socket no longer means a tcp socket (it could mean
64 * an ssl socket). So now we must use Actual_Socket when we know
65 * we are talking about a tcp socket.
67 typedef struct Socket_tag *Actual_Socket;
72 * Which address family this address belongs to. AF_INET for
73 * IPv4; AF_INET6 for IPv6; AF_UNSPEC indicates that name
74 * resolution has not been done and a simple host name is held
75 * in this SockAddr structure.
79 struct addrinfo *ais; /* Addresses IPv6 style. */
80 struct addrinfo *ai; /* steps along the linked list */
82 unsigned long *addresses; /* Addresses IPv4 style. */
83 int naddresses, curraddr;
85 char hostname[512]; /* Store an unresolved host name. */
88 static tree234 *sktree;
90 static void uxsel_tell(Actual_Socket s);
92 static int cmpfortree(void *av, void *bv)
94 Actual_Socket a = (Actual_Socket) av, b = (Actual_Socket) bv;
95 int as = a->s, bs = b->s;
107 static int cmpforsearch(void *av, void *bv)
109 Actual_Socket b = (Actual_Socket) bv;
110 int as = *(int *)av, bs = b->s;
120 sktree = newtree234(cmpfortree);
123 void sk_cleanup(void)
129 for (i = 0; (s = index234(sktree, i)) != NULL; i++) {
135 SockAddr sk_namelookup(const char *host, char **canonicalname, int address_family)
137 SockAddr ret = snew(struct SockAddr_tag);
139 struct addrinfo hints;
143 struct hostent *h = NULL;
148 /* Clear the structure and default to IPv4. */
149 memset(ret, 0, sizeof(struct SockAddr_tag));
150 ret->family = 0; /* We set this one when we have resolved the host. */
155 hints.ai_flags = AI_CANONNAME;
156 hints.ai_family = (address_family == ADDRTYPE_IPV4 ? AF_INET :
157 address_family == ADDRTYPE_IPV6 ? AF_INET6 :
159 hints.ai_socktype = SOCK_STREAM;
160 hints.ai_protocol = 0;
161 hints.ai_addrlen = 0;
162 hints.ai_addr = NULL;
163 hints.ai_canonname = NULL;
164 hints.ai_next = NULL;
165 err = getaddrinfo(host, NULL, &hints, &ret->ais);
168 ret->error = gai_strerror(err);
171 ret->family = ret->ai->ai_family;
173 if (ret->ai->ai_canonname != NULL)
174 strncat(realhost, ret->ai->ai_canonname, sizeof(realhost) - 1);
176 strncat(realhost, host, sizeof(realhost) - 1);
178 if ((a = inet_addr(host)) == (unsigned long)(in_addr_t)(-1)) {
180 * Otherwise use the IPv4-only gethostbyname... (NOTE:
181 * we don't use gethostbyname as a fallback!)
183 if (ret->family == 0) {
184 /*debug(("Resolving \"%s\" with gethostbyname() (IPv4 only)...\n", host)); */
185 if ( (h = gethostbyname(host)) )
186 ret->family = AF_INET;
188 if (ret->family == 0) {
189 ret->error = (h_errno == HOST_NOT_FOUND ||
190 h_errno == NO_DATA ||
191 h_errno == NO_ADDRESS ? "Host does not exist" :
192 h_errno == TRY_AGAIN ?
193 "Temporary name service failure" :
194 "gethostbyname: unknown error");
197 /* This way we are always sure the h->h_name is valid :) */
198 strncpy(realhost, h->h_name, sizeof(realhost));
199 for (n = 0; h->h_addr_list[n]; n++);
200 ret->addresses = snewn(n, unsigned long);
202 for (n = 0; n < ret->naddresses; n++) {
203 memcpy(&a, h->h_addr_list[n], sizeof(a));
204 ret->addresses[n] = ntohl(a);
208 * This must be a numeric IPv4 address because it caused a
209 * success return from inet_addr.
211 ret->family = AF_INET;
212 strncpy(realhost, host, sizeof(realhost));
213 ret->addresses = snew(unsigned long);
215 ret->addresses[0] = ntohl(a);
219 realhost[lenof(realhost)-1] = '\0';
220 *canonicalname = snewn(1+strlen(realhost), char);
221 strcpy(*canonicalname, realhost);
225 SockAddr sk_nonamelookup(const char *host)
227 SockAddr ret = snew(struct SockAddr_tag);
229 ret->family = AF_UNSPEC;
230 strncpy(ret->hostname, host, lenof(ret->hostname));
231 ret->hostname[lenof(ret->hostname)-1] = '\0';
235 ret->addresses = NULL;
240 static int sk_nextaddr(SockAddr addr)
243 if (addr->ai && addr->ai->ai_next) {
244 addr->ai = addr->ai->ai_next;
245 addr->family = addr->ai->ai_family;
250 if (addr->curraddr+1 < addr->naddresses) {
259 void sk_getaddr(SockAddr addr, char *buf, int buflen)
262 if (addr->family == AF_UNSPEC) {
263 strncpy(buf, addr->hostname, buflen);
264 buf[buflen-1] = '\0';
267 if (getnameinfo(addr->ai->ai_addr, addr->ai->ai_addrlen, buf, buflen,
268 NULL, 0, NI_NUMERICHOST) != 0) {
270 strncat(buf, "<unknown>", buflen - 1);
274 assert(addr->family == AF_INET);
275 a.s_addr = htonl(addr->addresses[addr->curraddr]);
276 strncpy(buf, inet_ntoa(a), buflen);
277 buf[buflen-1] = '\0';
282 int sk_hostname_is_local(char *name)
284 return !strcmp(name, "localhost");
287 #define ipv4_is_loopback(addr) \
288 (((addr).s_addr & htonl(0xff000000)) == htonl(0x7f000000))
290 static int sockaddr_is_loopback(struct sockaddr *sa)
292 struct sockaddr_in *sin;
294 struct sockaddr_in6 *sin6;
297 switch (sa->sa_family) {
299 sin = (struct sockaddr_in *)sa;
300 return ipv4_is_loopback(sin->sin_addr);
303 sin6 = (struct sockaddr_in6 *)sa;
304 return IN6_IS_ADDR_LOOPBACK(&sin6->sin6_addr);
313 int sk_address_is_local(SockAddr addr)
316 if (addr->family == AF_UNSPEC)
317 return 0; /* we don't know; assume not */
320 return sockaddr_is_loopback(addr->ai->ai_addr);
323 assert(addr->family == AF_INET);
324 a.s_addr = htonl(addr->addresses[addr->curraddr]);
325 return ipv4_is_loopback(a);
330 int sk_addrtype(SockAddr addr)
332 return (addr->family == AF_INET ? ADDRTYPE_IPV4 :
334 addr->family == AF_INET6 ? ADDRTYPE_IPV6 :
339 void sk_addrcopy(SockAddr addr, char *buf)
343 if (addr->family == AF_INET)
344 memcpy(buf, &((struct sockaddr_in *)addr->ai->ai_addr)->sin_addr,
345 sizeof(struct in_addr));
346 else if (addr->family == AF_INET6)
347 memcpy(buf, &((struct sockaddr_in6 *)addr->ai->ai_addr)->sin6_addr,
348 sizeof(struct in6_addr));
354 assert(addr->family == AF_INET);
355 a.s_addr = htonl(addr->addresses[addr->curraddr]);
356 memcpy(buf, (char*) &a.s_addr, 4);
360 void sk_addr_free(SockAddr addr)
364 if (addr->ais != NULL)
365 freeaddrinfo(addr->ais);
367 sfree(addr->addresses);
372 static Plug sk_tcp_plug(Socket sock, Plug p)
374 Actual_Socket s = (Actual_Socket) sock;
381 static void sk_tcp_flush(Socket s)
384 * We send data to the socket as soon as we can anyway,
385 * so we don't need to do anything here. :-)
389 static void sk_tcp_close(Socket s);
390 static int sk_tcp_write(Socket s, const char *data, int len);
391 static int sk_tcp_write_oob(Socket s, const char *data, int len);
392 static void sk_tcp_set_private_ptr(Socket s, void *ptr);
393 static void *sk_tcp_get_private_ptr(Socket s);
394 static void sk_tcp_set_frozen(Socket s, int is_frozen);
395 static const char *sk_tcp_socket_error(Socket s);
397 static struct socket_function_table tcp_fn_table = {
403 sk_tcp_set_private_ptr,
404 sk_tcp_get_private_ptr,
409 Socket sk_register(OSSocket sockfd, Plug plug)
414 * Create Socket structure.
416 ret = snew(struct Socket_tag);
417 ret->fn = &tcp_fn_table;
420 bufchain_init(&ret->output_data);
421 ret->writable = 1; /* to start with */
422 ret->sending_oob = 0;
424 ret->frozen_readable = 0;
425 ret->localhost_only = 0; /* unused, but best init anyway */
426 ret->pending_error = 0;
427 ret->oobpending = FALSE;
435 ret->error = strerror(errno);
447 static int try_connect(Actual_Socket sock)
451 struct sockaddr_in6 a6;
453 struct sockaddr_in a;
454 struct sockaddr_un au;
455 const struct sockaddr *sa;
461 * Remove the socket from the tree before we overwrite its
462 * internal socket id, because that forms part of the tree's
463 * sorting criterion. We'll add it back before exiting this
464 * function, whether we changed anything or not.
466 del234(sktree, sock);
471 plug_log(sock->plug, 0, sock->addr, sock->port, NULL, 0);
476 assert(sock->addr->family != AF_UNSPEC);
477 s = socket(sock->addr->family, SOCK_STREAM, 0);
487 if (sock->oobinline) {
489 setsockopt(s, SOL_SOCKET, SO_OOBINLINE, (void *) &b, sizeof(b));
494 setsockopt(s, IPPROTO_TCP, TCP_NODELAY, (void *) &b, sizeof(b));
497 if (sock->keepalive) {
499 setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, (void *) &b, sizeof(b));
503 * Bind to local address.
506 localport = 1023; /* count from 1023 downwards */
508 localport = 0; /* just use port 0 (ie kernel picks) */
510 /* BSD IP stacks need sockaddr_in zeroed before filling in */
511 memset(&a,'\0',sizeof(struct sockaddr_in));
513 memset(&a6,'\0',sizeof(struct sockaddr_in6));
516 /* We don't try to bind to a local address for UNIX domain sockets. (Why
517 * do we bother doing the bind when localport == 0 anyway?) */
518 if(sock->addr->family != AF_UNIX) {
519 /* Loop round trying to bind */
524 if (sock->addr->family == AF_INET6) {
525 /* XXX use getaddrinfo to get a local address? */
526 a6.sin6_family = AF_INET6;
527 a6.sin6_addr = in6addr_any;
528 a6.sin6_port = htons(localport);
529 retcode = bind(s, (struct sockaddr *) &a6, sizeof(a6));
533 assert(sock->addr->family == AF_INET);
534 a.sin_family = AF_INET;
535 a.sin_addr.s_addr = htonl(INADDR_ANY);
536 a.sin_port = htons(localport);
537 retcode = bind(s, (struct sockaddr *) &a, sizeof(a));
544 if (err != EADDRINUSE) /* failed, for a bad reason */
549 break; /* we're only looping once */
552 break; /* we might have got to the end */
560 * Connect to remote address.
562 switch(sock->addr->family) {
565 /* XXX would be better to have got getaddrinfo() to fill in the port. */
566 ((struct sockaddr_in *)sock->addr->ai->ai_addr)->sin_port =
568 sa = (const struct sockaddr *)sock->addr->ai->ai_addr;
569 salen = sock->addr->ai->ai_addrlen;
572 ((struct sockaddr_in *)sock->addr->ai->ai_addr)->sin_port =
574 sa = (const struct sockaddr *)sock->addr->ai->ai_addr;
575 salen = sock->addr->ai->ai_addrlen;
579 a.sin_family = AF_INET;
580 a.sin_addr.s_addr = htonl(sock->addr->addresses[sock->addr->curraddr]);
581 a.sin_port = htons((short) sock->port);
582 sa = (const struct sockaddr *)&a;
587 assert(sock->port == 0); /* to catch confused people */
588 assert(strlen(sock->addr->hostname) < sizeof au.sun_path);
589 memset(&au, 0, sizeof au);
590 au.sun_family = AF_UNIX;
591 strcpy(au.sun_path, sock->addr->hostname);
592 sa = (const struct sockaddr *)&au;
597 assert(0 && "unknown address family");
598 exit(1); /* XXX: GCC doesn't understand assert() on some systems. */
601 fl = fcntl(s, F_GETFL);
603 fcntl(s, F_SETFL, fl | O_NONBLOCK);
605 if ((connect(s, sa, salen)) < 0) {
606 if ( errno != EINPROGRESS ) {
612 * If we _don't_ get EWOULDBLOCK, the connect has completed
613 * and we should set the socket as connected and writable.
624 * No matter what happened, put the socket back in the tree.
626 add234(sktree, sock);
629 plug_log(sock->plug, 1, sock->addr, sock->port, strerror(err), err);
633 Socket sk_new(SockAddr addr, int port, int privport, int oobinline,
634 int nodelay, int keepalive, Plug plug)
640 * Create Socket structure.
642 ret = snew(struct Socket_tag);
643 ret->fn = &tcp_fn_table;
646 bufchain_init(&ret->output_data);
647 ret->connected = 0; /* to start with */
648 ret->writable = 0; /* to start with */
649 ret->sending_oob = 0;
651 ret->frozen_readable = 0;
652 ret->localhost_only = 0; /* unused, but best init anyway */
653 ret->pending_error = 0;
654 ret->oobpending = FALSE;
658 ret->oobinline = oobinline;
659 ret->nodelay = nodelay;
660 ret->keepalive = keepalive;
661 ret->privport = privport;
666 err = try_connect(ret);
667 } while (err && sk_nextaddr(ret->addr));
670 ret->error = strerror(err);
675 Socket sk_newlistener(char *srcaddr, int port, Plug plug, int local_host_only, int address_family)
679 struct addrinfo hints, *ai;
681 struct sockaddr_in6 a6;
683 struct sockaddr *addr;
685 struct sockaddr_in a;
691 * Create Socket structure.
693 ret = snew(struct Socket_tag);
694 ret->fn = &tcp_fn_table;
697 bufchain_init(&ret->output_data);
698 ret->writable = 0; /* to start with */
699 ret->sending_oob = 0;
701 ret->frozen_readable = 0;
702 ret->localhost_only = local_host_only;
703 ret->pending_error = 0;
704 ret->oobpending = FALSE;
709 * Translate address_family from platform-independent constants
710 * into local reality.
712 address_family = (address_family == ADDRTYPE_IPV4 ? AF_INET :
714 address_family == ADDRTYPE_IPV6 ? AF_INET6 :
719 /* Let's default to IPv6.
720 * If the stack doesn't support IPv6, we will fall back to IPv4. */
721 if (address_family == AF_UNSPEC) address_family = AF_INET6;
723 /* No other choice, default to IPv4 */
724 if (address_family == AF_UNSPEC) address_family = AF_INET;
730 s = socket(address_family, SOCK_STREAM, 0);
733 /* If the host doesn't support IPv6 try fallback to IPv4. */
734 if (s < 0 && address_family == AF_INET6) {
735 address_family = AF_INET;
736 s = socket(address_family, SOCK_STREAM, 0);
741 ret->error = strerror(errno);
749 setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (const char *)&on, sizeof(on));
752 addr = NULL; addrlen = -1; /* placate optimiser */
754 if (srcaddr != NULL) {
756 hints.ai_flags = AI_NUMERICHOST;
757 hints.ai_family = address_family;
758 hints.ai_socktype = SOCK_STREAM;
759 hints.ai_protocol = 0;
760 hints.ai_addrlen = 0;
761 hints.ai_addr = NULL;
762 hints.ai_canonname = NULL;
763 hints.ai_next = NULL;
764 assert(port >= 0 && port <= 99999);
765 sprintf(portstr, "%d", port);
766 retcode = getaddrinfo(srcaddr, portstr, &hints, &ai);
769 addrlen = ai->ai_addrlen;
772 memset(&a,'\0',sizeof(struct sockaddr_in));
773 a.sin_family = AF_INET;
774 a.sin_port = htons(port);
775 a.sin_addr.s_addr = inet_addr(srcaddr);
776 if (a.sin_addr.s_addr != (in_addr_t)(-1)) {
777 /* Override localhost_only with specified listen addr. */
778 ret->localhost_only = ipv4_is_loopback(a.sin_addr);
780 addr = (struct sockaddr *)&a;
788 if (address_family == AF_INET6) {
789 memset(&a6,'\0',sizeof(struct sockaddr_in6));
790 a6.sin6_family = AF_INET6;
791 a6.sin6_port = htons(port);
793 a6.sin6_addr = in6addr_loopback;
795 a6.sin6_addr = in6addr_any;
796 addr = (struct sockaddr *)&a6;
797 addrlen = sizeof(a6);
801 memset(&a,'\0',sizeof(struct sockaddr_in));
802 a.sin_family = AF_INET;
803 a.sin_port = htons(port);
805 a.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
807 a.sin_addr.s_addr = htonl(INADDR_ANY);
808 addr = (struct sockaddr *)&a;
813 retcode = bind(s, addr, addrlen);
816 ret->error = strerror(errno);
820 if (listen(s, SOMAXCONN) < 0) {
822 ret->error = strerror(errno);
834 static void sk_tcp_close(Socket sock)
836 Actual_Socket s = (Actual_Socket) sock;
842 sk_addr_free(s->addr);
846 void *sk_getxdmdata(void *sock, int *lenp)
848 Actual_Socket s = (Actual_Socket) sock;
850 struct sockaddr_in addr;
852 struct sockaddr_storage addr;
853 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&addr;
855 struct sockaddr *sa = (struct sockaddr *)&addr;
856 struct sockaddr_in *sin = (struct sockaddr_in *)&addr;
859 static unsigned int unix_addr = 0xFFFFFFFF;
862 * We must check that this socket really _is_ an Actual_Socket.
864 if (s->fn != &tcp_fn_table)
865 return NULL; /* failure */
867 addrlen = sizeof(addr);
868 if (getsockname(s->s, sa, &addrlen) < 0)
870 switch(sa->sa_family) {
873 buf = snewn(*lenp, char);
874 PUT_32BIT_MSB_FIRST(buf, ntohl(sin->sin_addr.s_addr));
875 PUT_16BIT_MSB_FIRST(buf+4, ntohs(sin->sin_port));
880 buf = snewn(*lenp, char);
881 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
882 memcpy(buf, sin6->sin6_addr.s6_addr + 12, 4);
883 PUT_16BIT_MSB_FIRST(buf+4, ntohs(sin6->sin6_port));
885 /* This is stupid, but it's what XLib does. */
891 buf = snewn(*lenp, char);
892 PUT_32BIT_MSB_FIRST(buf, unix_addr--);
893 PUT_16BIT_MSB_FIRST(buf+4, getpid());
906 * The function which tries to send on a socket once it's deemed
909 void try_send(Actual_Socket s)
911 while (s->sending_oob || bufchain_size(&s->output_data) > 0) {
917 if (s->sending_oob) {
918 urgentflag = MSG_OOB;
919 len = s->sending_oob;
923 bufchain_prefix(&s->output_data, &data, &len);
925 nsent = send(s->s, data, len, urgentflag);
926 noise_ultralight(nsent);
928 err = (nsent < 0 ? errno : 0);
929 if (err == EWOULDBLOCK) {
931 * Perfectly normal: we've sent all we can for the moment.
937 * We unfortunately can't just call plug_closing(),
938 * because it's quite likely that we're currently
939 * _in_ a call from the code we'd be calling back
940 * to, so we'd have to make half the SSH code
941 * reentrant. Instead we flag a pending error on
942 * the socket, to be dealt with (by calling
943 * plug_closing()) at some suitable future moment.
945 s->pending_error = err;
949 if (s->sending_oob) {
951 memmove(s->oobdata, s->oobdata+nsent, len-nsent);
952 s->sending_oob = len - nsent;
957 bufchain_consume(&s->output_data, nsent);
964 static int sk_tcp_write(Socket sock, const char *buf, int len)
966 Actual_Socket s = (Actual_Socket) sock;
969 * Add the data to the buffer list on the socket.
971 bufchain_add(&s->output_data, buf, len);
974 * Now try sending from the start of the buffer list.
980 * Update the select() status to correctly reflect whether or
981 * not we should be selecting for write.
985 return bufchain_size(&s->output_data);
988 static int sk_tcp_write_oob(Socket sock, const char *buf, int len)
990 Actual_Socket s = (Actual_Socket) sock;
993 * Replace the buffer list on the socket with the data.
995 bufchain_clear(&s->output_data);
996 assert(len <= sizeof(s->oobdata));
997 memcpy(s->oobdata, buf, len);
998 s->sending_oob = len;
1001 * Now try sending from the start of the buffer list.
1007 * Update the select() status to correctly reflect whether or
1008 * not we should be selecting for write.
1012 return s->sending_oob;
1015 static int net_select_result(int fd, int event)
1018 char buf[20480]; /* nice big buffer for plenty of speed */
1022 /* Find the Socket structure */
1023 s = find234(sktree, &fd, cmpforsearch);
1025 return 1; /* boggle */
1027 noise_ultralight(event);
1030 case 4: /* exceptional */
1031 if (!s->oobinline) {
1033 * On a non-oobinline socket, this indicates that we
1034 * can immediately perform an OOB read and get back OOB
1035 * data, which we will send to the back end with
1036 * type==2 (urgent data).
1038 ret = recv(s->s, buf, sizeof(buf), MSG_OOB);
1039 noise_ultralight(ret);
1041 return plug_closing(s->plug,
1042 ret == 0 ? "Internal networking trouble" :
1043 strerror(errno), errno, 0);
1046 * Receiving actual data on a socket means we can
1047 * stop falling back through the candidate
1048 * addresses to connect to.
1051 sk_addr_free(s->addr);
1054 return plug_receive(s->plug, 2, buf, ret);
1060 * If we reach here, this is an oobinline socket, which
1061 * means we should set s->oobpending and then deal with it
1062 * when we get called for the readability event (which
1063 * should also occur).
1065 s->oobpending = TRUE;
1067 case 1: /* readable; also acceptance */
1070 * On a listening socket, the readability event means a
1071 * connection is ready to be accepted.
1074 struct sockaddr_in ss;
1076 struct sockaddr_storage ss;
1078 socklen_t addrlen = sizeof(ss);
1079 int t; /* socket of connection */
1082 memset(&ss, 0, addrlen);
1083 t = accept(s->s, (struct sockaddr *)&ss, &addrlen);
1088 fl = fcntl(t, F_GETFL);
1090 fcntl(t, F_SETFL, fl | O_NONBLOCK);
1092 if (s->localhost_only &&
1093 !sockaddr_is_loopback((struct sockaddr *)&ss)) {
1094 close(t); /* someone let nonlocal through?! */
1095 } else if (plug_accepting(s->plug, t)) {
1096 close(t); /* denied or error */
1102 * If we reach here, this is not a listening socket, so
1103 * readability really means readability.
1106 /* In the case the socket is still frozen, we don't even bother */
1108 s->frozen_readable = 1;
1113 * We have received data on the socket. For an oobinline
1114 * socket, this might be data _before_ an urgent pointer,
1115 * in which case we send it to the back end with type==1
1116 * (data prior to urgent).
1118 if (s->oobinline && s->oobpending) {
1120 if (ioctl(s->s, SIOCATMARK, &atmark) == 0 && atmark)
1121 s->oobpending = FALSE; /* clear this indicator */
1125 ret = recv(s->s, buf, s->oobpending ? 1 : sizeof(buf), 0);
1126 noise_ultralight(ret);
1128 if (errno == EWOULDBLOCK) {
1134 * An error at this point _might_ be an error reported
1135 * by a non-blocking connect(). So before we return a
1136 * panic status to the user, let's just see whether
1141 plug_log(s->plug, 1, s->addr, s->port, strerror(err), err);
1142 while (s->addr && sk_nextaddr(s->addr)) {
1143 err = try_connect(s);
1147 return plug_closing(s->plug, strerror(err), err, 0);
1148 } else if (0 == ret) {
1149 return plug_closing(s->plug, NULL, 0, 0);
1152 * Receiving actual data on a socket means we can
1153 * stop falling back through the candidate
1154 * addresses to connect to.
1157 sk_addr_free(s->addr);
1160 return plug_receive(s->plug, atmark ? 0 : 1, buf, ret);
1163 case 2: /* writable */
1164 if (!s->connected) {
1166 * select() reports a socket as _writable_ when an
1167 * asynchronous connection is completed.
1169 s->connected = s->writable = 1;
1173 int bufsize_before, bufsize_after;
1175 bufsize_before = s->sending_oob + bufchain_size(&s->output_data);
1177 bufsize_after = s->sending_oob + bufchain_size(&s->output_data);
1178 if (bufsize_after < bufsize_before)
1179 plug_sent(s->plug, bufsize_after);
1188 * Deal with socket errors detected in try_send().
1190 void net_pending_errors(void)
1196 * This might be a fiddly business, because it's just possible
1197 * that handling a pending error on one socket might cause
1198 * others to be closed. (I can't think of any reason this might
1199 * happen in current SSH implementation, but to maintain
1200 * generality of this network layer I'll assume the worst.)
1202 * So what we'll do is search the socket list for _one_ socket
1203 * with a pending error, and then handle it, and then search
1204 * the list again _from the beginning_. Repeat until we make a
1205 * pass with no socket errors present. That way we are
1206 * protected against the socket list changing under our feet.
1210 for (i = 0; (s = index234(sktree, i)) != NULL; i++) {
1211 if (s->pending_error) {
1213 * An error has occurred on this socket. Pass it to the
1216 plug_closing(s->plug, strerror(s->pending_error),
1217 s->pending_error, 0);
1225 * Each socket abstraction contains a `void *' private field in
1226 * which the client can keep state.
1228 static void sk_tcp_set_private_ptr(Socket sock, void *ptr)
1230 Actual_Socket s = (Actual_Socket) sock;
1231 s->private_ptr = ptr;
1234 static void *sk_tcp_get_private_ptr(Socket sock)
1236 Actual_Socket s = (Actual_Socket) sock;
1237 return s->private_ptr;
1241 * Special error values are returned from sk_namelookup and sk_new
1242 * if there's a problem. These functions extract an error message,
1243 * or return NULL if there's no problem.
1245 const char *sk_addr_error(SockAddr addr)
1249 static const char *sk_tcp_socket_error(Socket sock)
1251 Actual_Socket s = (Actual_Socket) sock;
1255 static void sk_tcp_set_frozen(Socket sock, int is_frozen)
1257 Actual_Socket s = (Actual_Socket) sock;
1258 if (s->frozen == is_frozen)
1260 s->frozen = is_frozen;
1261 if (!is_frozen && s->frozen_readable) {
1263 recv(s->s, &c, 1, MSG_PEEK);
1265 s->frozen_readable = 0;
1269 static void uxsel_tell(Actual_Socket s)
1273 rwx |= 1; /* read == accept */
1276 rwx |= 2; /* write == connect */
1277 if (s->connected && !s->frozen)
1278 rwx |= 1 | 4; /* read, except */
1279 if (bufchain_size(&s->output_data))
1280 rwx |= 2; /* write */
1282 uxsel_set(s->s, rwx, net_select_result);
1285 int net_service_lookup(char *service)
1288 se = getservbyname(service, NULL);
1290 return ntohs(se->s_port);
1295 SockAddr platform_get_x11_unix_address(int displaynum, char **canonicalname)
1297 SockAddr ret = snew(struct SockAddr_tag);
1300 memset(ret, 0, sizeof *ret);
1301 ret->family = AF_UNIX;
1302 n = snprintf(ret->hostname, sizeof ret->hostname,
1303 "%s%d", X11_UNIX_PATH, displaynum);
1305 ret->error = "snprintf failed";
1306 else if(n >= sizeof ret->hostname)
1307 ret->error = "X11 UNIX name too long";
1309 *canonicalname = dupstr(ret->hostname);
1311 ret->ai = ret->ais = NULL;
1313 ret->addresses = NULL;
1314 ret->curraddr = ret->naddresses = 0;