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
26 # define X11_UNIX_PATH "/tmp/.X11-unix/X"
30 struct socket_function_table *fn;
31 /* the above variable absolutely *must* be the first in this structure */
39 int frozen; /* this causes readability notifications to be ignored */
40 int frozen_readable; /* this means we missed at least one readability
41 * notification while we were frozen */
42 int localhost_only; /* for listening sockets */
45 int oobpending; /* is there OOB data available to read? */
47 int pending_error; /* in case send() returns error */
49 int nodelay, keepalive; /* for connect()-type sockets */
50 int privport, port; /* and again */
55 * We used to typedef struct Socket_tag *Socket.
57 * Since we have made the networking abstraction slightly more
58 * abstract, Socket no longer means a tcp socket (it could mean
59 * an ssl socket). So now we must use Actual_Socket when we know
60 * we are talking about a tcp socket.
62 typedef struct Socket_tag *Actual_Socket;
67 * Which address family this address belongs to. AF_INET for
68 * IPv4; AF_INET6 for IPv6; AF_UNSPEC indicates that name
69 * resolution has not been done and a simple host name is held
70 * in this SockAddr structure.
74 struct addrinfo *ais; /* Addresses IPv6 style. */
75 struct addrinfo *ai; /* steps along the linked list */
77 unsigned long *addresses; /* Addresses IPv4 style. */
78 int naddresses, curraddr;
80 char hostname[512]; /* Store an unresolved host name. */
83 static tree234 *sktree;
85 static void uxsel_tell(Actual_Socket s);
87 static int cmpfortree(void *av, void *bv)
89 Actual_Socket a = (Actual_Socket) av, b = (Actual_Socket) bv;
90 int as = a->s, bs = b->s;
98 static int cmpforsearch(void *av, void *bv)
100 Actual_Socket b = (Actual_Socket) bv;
101 int as = *(int *)av, bs = b->s;
111 sktree = newtree234(cmpfortree);
114 void sk_cleanup(void)
120 for (i = 0; (s = index234(sktree, i)) != NULL; i++) {
126 SockAddr sk_namelookup(const char *host, char **canonicalname, int address_family)
128 SockAddr ret = snew(struct SockAddr_tag);
130 struct addrinfo hints;
134 struct hostent *h = NULL;
139 /* Clear the structure and default to IPv4. */
140 memset(ret, 0, sizeof(struct SockAddr_tag));
141 ret->family = 0; /* We set this one when we have resolved the host. */
146 hints.ai_flags = AI_CANONNAME;
147 hints.ai_family = (address_family == ADDRTYPE_IPV4 ? AF_INET :
148 address_family == ADDRTYPE_IPV6 ? AF_INET6 :
150 hints.ai_socktype = SOCK_STREAM;
151 hints.ai_protocol = 0;
152 hints.ai_addrlen = 0;
153 hints.ai_addr = NULL;
154 hints.ai_canonname = NULL;
155 hints.ai_next = NULL;
156 err = getaddrinfo(host, NULL, &hints, &ret->ais);
159 ret->error = gai_strerror(err);
162 ret->family = ret->ai->ai_family;
164 if (ret->ai->ai_canonname != NULL)
165 strncat(realhost, ret->ai->ai_canonname, sizeof(realhost) - 1);
167 strncat(realhost, host, sizeof(realhost) - 1);
169 if ((a = inet_addr(host)) == (unsigned long)(in_addr_t)(-1)) {
171 * Otherwise use the IPv4-only gethostbyname... (NOTE:
172 * we don't use gethostbyname as a fallback!)
174 if (ret->family == 0) {
175 /*debug(("Resolving \"%s\" with gethostbyname() (IPv4 only)...\n", host)); */
176 if ( (h = gethostbyname(host)) )
177 ret->family = AF_INET;
179 if (ret->family == 0) {
180 ret->error = (h_errno == HOST_NOT_FOUND ||
181 h_errno == NO_DATA ||
182 h_errno == NO_ADDRESS ? "Host does not exist" :
183 h_errno == TRY_AGAIN ?
184 "Temporary name service failure" :
185 "gethostbyname: unknown error");
188 /* This way we are always sure the h->h_name is valid :) */
189 strncpy(realhost, h->h_name, sizeof(realhost));
190 for (n = 0; h->h_addr_list[n]; n++);
191 ret->addresses = snewn(n, unsigned long);
193 for (n = 0; n < ret->naddresses; n++) {
194 memcpy(&a, h->h_addr_list[n], sizeof(a));
195 ret->addresses[n] = ntohl(a);
199 * This must be a numeric IPv4 address because it caused a
200 * success return from inet_addr.
202 ret->family = AF_INET;
203 strncpy(realhost, host, sizeof(realhost));
204 ret->addresses = snew(unsigned long);
206 ret->addresses[0] = ntohl(a);
210 realhost[lenof(realhost)-1] = '\0';
211 *canonicalname = snewn(1+strlen(realhost), char);
212 strcpy(*canonicalname, realhost);
216 SockAddr sk_nonamelookup(const char *host)
218 SockAddr ret = snew(struct SockAddr_tag);
220 ret->family = AF_UNSPEC;
221 strncpy(ret->hostname, host, lenof(ret->hostname));
222 ret->hostname[lenof(ret->hostname)-1] = '\0';
226 ret->addresses = NULL;
231 static int sk_nextaddr(SockAddr addr)
234 if (addr->ai->ai_next) {
235 addr->ai = addr->ai->ai_next;
236 addr->family = addr->ai->ai_family;
241 if (addr->curraddr+1 < addr->naddresses) {
250 void sk_getaddr(SockAddr addr, char *buf, int buflen)
253 if (addr->family == AF_UNSPEC) {
254 strncpy(buf, addr->hostname, buflen);
255 buf[buflen-1] = '\0';
258 if (getnameinfo(addr->ai->ai_addr, addr->ai->ai_addrlen, buf, buflen,
259 NULL, 0, NI_NUMERICHOST) != 0) {
261 strncat(buf, "<unknown>", buflen - 1);
265 assert(addr->family == AF_INET);
266 a.s_addr = htonl(addr->addresses[addr->curraddr]);
267 strncpy(buf, inet_ntoa(a), buflen);
268 buf[buflen-1] = '\0';
273 int sk_hostname_is_local(char *name)
275 return !strcmp(name, "localhost");
278 #define ipv4_is_loopback(addr) \
279 (((addr).s_addr & htonl(0xff000000)) == htonl(0x7f000000))
281 static int sockaddr_is_loopback(struct sockaddr *sa)
283 struct sockaddr_in *sin;
285 struct sockaddr_in6 *sin6;
288 switch (sa->sa_family) {
290 sin = (struct sockaddr_in *)sa;
291 return ipv4_is_loopback(sin->sin_addr);
294 sin6 = (struct sockaddr_in6 *)sa;
295 return IN6_IS_ADDR_LOOPBACK(&sin6->sin6_addr);
304 int sk_address_is_local(SockAddr addr)
307 if (addr->family == AF_UNSPEC)
308 return 0; /* we don't know; assume not */
311 return sockaddr_is_loopback(addr->ai->ai_addr);
314 assert(addr->family == AF_INET);
315 a.s_addr = htonl(addr->addresses[addr->curraddr]);
316 return ipv4_is_loopback(a);
321 int sk_addrtype(SockAddr addr)
323 return (addr->family == AF_INET ? ADDRTYPE_IPV4 :
325 addr->family == AF_INET6 ? ADDRTYPE_IPV6 :
330 void sk_addrcopy(SockAddr addr, char *buf)
334 if (addr->family == AF_INET)
335 memcpy(buf, &((struct sockaddr_in *)addr->ai->ai_addr)->sin_addr,
336 sizeof(struct in_addr));
337 else if (addr->family == AF_INET6)
338 memcpy(buf, &((struct sockaddr_in6 *)addr->ai->ai_addr)->sin6_addr,
339 sizeof(struct in6_addr));
345 assert(addr->family == AF_INET);
346 a.s_addr = htonl(addr->addresses[addr->curraddr]);
347 memcpy(buf, (char*) &a.s_addr, 4);
351 void sk_addr_free(SockAddr addr)
355 if (addr->ais != NULL)
356 freeaddrinfo(addr->ais);
358 sfree(addr->addresses);
363 static Plug sk_tcp_plug(Socket sock, Plug p)
365 Actual_Socket s = (Actual_Socket) sock;
372 static void sk_tcp_flush(Socket s)
375 * We send data to the socket as soon as we can anyway,
376 * so we don't need to do anything here. :-)
380 static void sk_tcp_close(Socket s);
381 static int sk_tcp_write(Socket s, const char *data, int len);
382 static int sk_tcp_write_oob(Socket s, const char *data, int len);
383 static void sk_tcp_set_private_ptr(Socket s, void *ptr);
384 static void *sk_tcp_get_private_ptr(Socket s);
385 static void sk_tcp_set_frozen(Socket s, int is_frozen);
386 static const char *sk_tcp_socket_error(Socket s);
388 static struct socket_function_table tcp_fn_table = {
394 sk_tcp_set_private_ptr,
395 sk_tcp_get_private_ptr,
400 Socket sk_register(OSSocket sockfd, Plug plug)
405 * Create Socket structure.
407 ret = snew(struct Socket_tag);
408 ret->fn = &tcp_fn_table;
411 bufchain_init(&ret->output_data);
412 ret->writable = 1; /* to start with */
413 ret->sending_oob = 0;
415 ret->frozen_readable = 0;
416 ret->localhost_only = 0; /* unused, but best init anyway */
417 ret->pending_error = 0;
418 ret->oobpending = FALSE;
425 ret->error = strerror(errno);
437 static int try_connect(Actual_Socket sock)
441 struct sockaddr_in6 a6;
443 struct sockaddr_in a;
444 struct sockaddr_un au;
445 const struct sockaddr *sa;
453 plug_log(sock->plug, 0, sock->addr, sock->port, NULL, 0);
458 assert(sock->addr->family != AF_UNSPEC);
459 s = socket(sock->addr->family, SOCK_STREAM, 0);
467 if (sock->oobinline) {
469 setsockopt(s, SOL_SOCKET, SO_OOBINLINE, (void *) &b, sizeof(b));
474 setsockopt(s, IPPROTO_TCP, TCP_NODELAY, (void *) &b, sizeof(b));
477 if (sock->keepalive) {
479 setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, (void *) &b, sizeof(b));
483 * Bind to local address.
486 localport = 1023; /* count from 1023 downwards */
488 localport = 0; /* just use port 0 (ie kernel picks) */
490 /* BSD IP stacks need sockaddr_in zeroed before filling in */
491 memset(&a,'\0',sizeof(struct sockaddr_in));
493 memset(&a6,'\0',sizeof(struct sockaddr_in6));
496 /* We don't try to bind to a local address for UNIX domain sockets. (Why
497 * do we bother doing the bind when localport == 0 anyway?) */
498 if(sock->addr->family != AF_UNIX) {
499 /* Loop round trying to bind */
504 if (sock->addr->family == AF_INET6) {
505 /* XXX use getaddrinfo to get a local address? */
506 a6.sin6_family = AF_INET6;
507 a6.sin6_addr = in6addr_any;
508 a6.sin6_port = htons(localport);
509 retcode = bind(s, (struct sockaddr *) &a6, sizeof(a6));
513 assert(sock->addr->family == AF_INET);
514 a.sin_family = AF_INET;
515 a.sin_addr.s_addr = htonl(INADDR_ANY);
516 a.sin_port = htons(localport);
517 retcode = bind(s, (struct sockaddr *) &a, sizeof(a));
524 if (err != EADDRINUSE) /* failed, for a bad reason */
529 break; /* we're only looping once */
532 break; /* we might have got to the end */
540 * Connect to remote address.
542 switch(sock->addr->family) {
545 /* XXX would be better to have got getaddrinfo() to fill in the port. */
546 ((struct sockaddr_in *)sock->addr->ai->ai_addr)->sin_port =
548 sa = (const struct sockaddr *)sock->addr->ai->ai_addr;
549 salen = sock->addr->ai->ai_addrlen;
552 ((struct sockaddr_in *)sock->addr->ai->ai_addr)->sin_port =
554 sa = (const struct sockaddr *)sock->addr->ai->ai_addr;
555 salen = sock->addr->ai->ai_addrlen;
559 a.sin_family = AF_INET;
560 a.sin_addr.s_addr = htonl(sock->addr->addresses[sock->addr->curraddr]);
561 a.sin_port = htons((short) sock->port);
562 sa = (const struct sockaddr *)&a;
567 assert(sock->port == 0); /* to catch confused people */
568 assert(strlen(sock->addr->hostname) < sizeof au.sun_path);
569 memset(&au, 0, sizeof au);
570 au.sun_family = AF_UNIX;
571 strcpy(au.sun_path, sock->addr->hostname);
572 sa = (const struct sockaddr *)&au;
577 assert(0 && "unknown address family");
580 fl = fcntl(s, F_GETFL);
582 fcntl(s, F_SETFL, fl | O_NONBLOCK);
584 if ((connect(s, sa, salen)) < 0) {
585 if ( errno != EINPROGRESS ) {
591 * If we _don't_ get EWOULDBLOCK, the connect has completed
592 * and we should set the socket as connected and writable.
599 add234(sktree, sock);
603 plug_log(sock->plug, 1, sock->addr, sock->port, strerror(err), err);
607 Socket sk_new(SockAddr addr, int port, int privport, int oobinline,
608 int nodelay, int keepalive, Plug plug)
614 * Create Socket structure.
616 ret = snew(struct Socket_tag);
617 ret->fn = &tcp_fn_table;
620 bufchain_init(&ret->output_data);
621 ret->connected = 0; /* to start with */
622 ret->writable = 0; /* to start with */
623 ret->sending_oob = 0;
625 ret->frozen_readable = 0;
626 ret->localhost_only = 0; /* unused, but best init anyway */
627 ret->pending_error = 0;
628 ret->oobpending = FALSE;
632 ret->oobinline = oobinline;
633 ret->nodelay = nodelay;
634 ret->keepalive = keepalive;
635 ret->privport = privport;
640 err = try_connect(ret);
641 } while (err && sk_nextaddr(ret->addr));
644 ret->error = strerror(err);
649 Socket sk_newlistener(char *srcaddr, int port, Plug plug, int local_host_only, int address_family)
653 struct addrinfo hints, *ai;
655 struct sockaddr_in6 a6;
657 struct sockaddr *addr;
659 struct sockaddr_in a;
665 * Create Socket structure.
667 ret = snew(struct Socket_tag);
668 ret->fn = &tcp_fn_table;
671 bufchain_init(&ret->output_data);
672 ret->writable = 0; /* to start with */
673 ret->sending_oob = 0;
675 ret->frozen_readable = 0;
676 ret->localhost_only = local_host_only;
677 ret->pending_error = 0;
678 ret->oobpending = FALSE;
683 * Translate address_family from platform-independent constants
684 * into local reality.
686 address_family = (address_family == ADDRTYPE_IPV4 ? AF_INET :
687 address_family == ADDRTYPE_IPV6 ? AF_INET6 : AF_UNSPEC);
690 /* Let's default to IPv6.
691 * If the stack doesn't support IPv6, we will fall back to IPv4. */
692 if (address_family == AF_UNSPEC) address_family = AF_INET6;
694 /* No other choice, default to IPv4 */
695 if (address_family == AF_UNSPEC) address_family = AF_INET;
701 s = socket(address_family, SOCK_STREAM, 0);
703 /* If the host doesn't support IPv6 try fallback to IPv4. */
704 if (s < 0 && address_family == AF_INET6) {
705 address_family = AF_INET;
706 s = socket(address_family, SOCK_STREAM, 0);
710 ret->error = strerror(errno);
716 setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (const char *)&on, sizeof(on));
719 addr = NULL; addrlen = -1; /* placate optimiser */
721 if (srcaddr != NULL) {
723 hints.ai_flags = AI_NUMERICHOST;
724 hints.ai_family = address_family;
725 hints.ai_socktype = SOCK_STREAM;
726 hints.ai_protocol = 0;
727 hints.ai_addrlen = 0;
728 hints.ai_addr = NULL;
729 hints.ai_canonname = NULL;
730 hints.ai_next = NULL;
731 assert(port >= 0 && port <= 99999);
732 sprintf(portstr, "%d", port);
733 retcode = getaddrinfo(srcaddr, portstr, &hints, &ai);
736 addrlen = ai->ai_addrlen;
739 memset(&a,'\0',sizeof(struct sockaddr_in));
740 a.sin_family = AF_INET;
741 a.sin_port = htons(port);
742 a.sin_addr.s_addr = inet_addr(srcaddr);
743 if (a.sin_addr.s_addr != (in_addr_t)(-1)) {
744 /* Override localhost_only with specified listen addr. */
745 ret->localhost_only = ipv4_is_loopback(a.sin_addr);
748 addr = (struct sockaddr *)a;
756 if (address_family == AF_INET6) {
757 memset(&a6,'\0',sizeof(struct sockaddr_in6));
758 a6.sin6_family = AF_INET6;
759 a6.sin6_port = htons(port);
761 a6.sin6_addr = in6addr_loopback;
763 a6.sin6_addr = in6addr_any;
764 addr = (struct sockaddr *)&a6;
765 addrlen = sizeof(a6);
769 memset(&a,'\0',sizeof(struct sockaddr_in));
770 a.sin_family = AF_INET;
771 a.sin_port = htons(port);
773 a.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
775 a.sin_addr.s_addr = htonl(INADDR_ANY);
776 addr = (struct sockaddr *)&a;
781 retcode = bind(s, addr, addrlen);
784 ret->error = strerror(errno);
788 if (listen(s, SOMAXCONN) < 0) {
790 ret->error = strerror(errno);
802 static void sk_tcp_close(Socket sock)
804 Actual_Socket s = (Actual_Socket) sock;
810 sk_addr_free(s->addr);
814 int sk_getxdmdata(void *sock, unsigned long *ip, int *port)
816 Actual_Socket s = (Actual_Socket) sock;
817 struct sockaddr_in addr;
821 * We must check that this socket really _is_ an Actual_Socket.
823 if (s->fn != &tcp_fn_table)
824 return 0; /* failure */
826 addrlen = sizeof(addr);
827 if (getsockname(s->s, (struct sockaddr *)&addr, &addrlen) < 0)
829 switch(addr.sin_family) {
831 *ip = ntohl(addr.sin_addr.s_addr);
832 *port = ntohs(addr.sin_port);
836 * For a Unix socket, we return 0xFFFFFFFF for the IP address and
837 * our current pid for the port. Bizarre, but such is life.
839 *ip = ntohl(0xFFFFFFFF);
853 * The function which tries to send on a socket once it's deemed
856 void try_send(Actual_Socket s)
858 while (s->sending_oob || bufchain_size(&s->output_data) > 0) {
864 if (s->sending_oob) {
865 urgentflag = MSG_OOB;
866 len = s->sending_oob;
870 bufchain_prefix(&s->output_data, &data, &len);
872 nsent = send(s->s, data, len, urgentflag);
873 noise_ultralight(nsent);
875 err = (nsent < 0 ? errno : 0);
876 if (err == EWOULDBLOCK) {
878 * Perfectly normal: we've sent all we can for the moment.
882 } else if (nsent == 0 ||
883 err == ECONNABORTED || err == ECONNRESET) {
885 * If send() returns CONNABORTED or CONNRESET, we
886 * unfortunately can't just call plug_closing(),
887 * because it's quite likely that we're currently
888 * _in_ a call from the code we'd be calling back
889 * to, so we'd have to make half the SSH code
890 * reentrant. Instead we flag a pending error on
891 * the socket, to be dealt with (by calling
892 * plug_closing()) at some suitable future moment.
894 s->pending_error = err;
897 /* We're inside the Unix frontend here, so we know
898 * that the frontend handle is unnecessary. */
899 logevent(NULL, strerror(err));
900 fatalbox("%s", strerror(err));
903 if (s->sending_oob) {
905 memmove(s->oobdata, s->oobdata+nsent, len-nsent);
906 s->sending_oob = len - nsent;
911 bufchain_consume(&s->output_data, nsent);
918 static int sk_tcp_write(Socket sock, const char *buf, int len)
920 Actual_Socket s = (Actual_Socket) sock;
923 * Add the data to the buffer list on the socket.
925 bufchain_add(&s->output_data, buf, len);
928 * Now try sending from the start of the buffer list.
934 * Update the select() status to correctly reflect whether or
935 * not we should be selecting for write.
939 return bufchain_size(&s->output_data);
942 static int sk_tcp_write_oob(Socket sock, const char *buf, int len)
944 Actual_Socket s = (Actual_Socket) sock;
947 * Replace the buffer list on the socket with the data.
949 bufchain_clear(&s->output_data);
950 assert(len <= sizeof(s->oobdata));
951 memcpy(s->oobdata, buf, len);
952 s->sending_oob = len;
955 * Now try sending from the start of the buffer list.
961 * Update the select() status to correctly reflect whether or
962 * not we should be selecting for write.
966 return s->sending_oob;
969 static int net_select_result(int fd, int event)
972 char buf[20480]; /* nice big buffer for plenty of speed */
976 /* Find the Socket structure */
977 s = find234(sktree, &fd, cmpforsearch);
979 return 1; /* boggle */
981 noise_ultralight(event);
984 case 4: /* exceptional */
987 * On a non-oobinline socket, this indicates that we
988 * can immediately perform an OOB read and get back OOB
989 * data, which we will send to the back end with
990 * type==2 (urgent data).
992 ret = recv(s->s, buf, sizeof(buf), MSG_OOB);
993 noise_ultralight(ret);
995 const char *str = (ret == 0 ? "Internal networking trouble" :
997 /* We're inside the Unix frontend here, so we know
998 * that the frontend handle is unnecessary. */
1000 fatalbox("%s", str);
1003 * Receiving actual data on a socket means we can
1004 * stop falling back through the candidate
1005 * addresses to connect to.
1008 sk_addr_free(s->addr);
1011 return plug_receive(s->plug, 2, buf, ret);
1017 * If we reach here, this is an oobinline socket, which
1018 * means we should set s->oobpending and then deal with it
1019 * when we get called for the readability event (which
1020 * should also occur).
1022 s->oobpending = TRUE;
1024 case 1: /* readable; also acceptance */
1027 * On a listening socket, the readability event means a
1028 * connection is ready to be accepted.
1031 struct sockaddr_in ss;
1033 struct sockaddr_storage ss;
1035 socklen_t addrlen = sizeof(ss);
1036 int t; /* socket of connection */
1038 memset(&ss, 0, addrlen);
1039 t = accept(s->s, (struct sockaddr *)&ss, &addrlen);
1044 if (s->localhost_only &&
1045 !sockaddr_is_loopback((struct sockaddr *)&ss)) {
1046 close(t); /* someone let nonlocal through?! */
1047 } else if (plug_accepting(s->plug, t)) {
1048 close(t); /* denied or error */
1054 * If we reach here, this is not a listening socket, so
1055 * readability really means readability.
1058 /* In the case the socket is still frozen, we don't even bother */
1060 s->frozen_readable = 1;
1065 * We have received data on the socket. For an oobinline
1066 * socket, this might be data _before_ an urgent pointer,
1067 * in which case we send it to the back end with type==1
1068 * (data prior to urgent).
1070 if (s->oobinline && s->oobpending) {
1072 if (ioctl(s->s, SIOCATMARK, &atmark) == 0 && atmark)
1073 s->oobpending = FALSE; /* clear this indicator */
1077 ret = recv(s->s, buf, s->oobpending ? 1 : sizeof(buf), 0);
1078 noise_ultralight(ret);
1080 if (errno == EWOULDBLOCK) {
1086 * An error at this point _might_ be an error reported
1087 * by a non-blocking connect(). So before we return a
1088 * panic status to the user, let's just see whether
1093 plug_log(s->plug, 1, s->addr, s->port, strerror(err), err);
1094 while (s->addr && sk_nextaddr(s->addr)) {
1095 err = try_connect(s);
1099 return plug_closing(s->plug, strerror(err), err, 0);
1100 } else if (0 == ret) {
1101 return plug_closing(s->plug, NULL, 0, 0);
1104 * Receiving actual data on a socket means we can
1105 * stop falling back through the candidate
1106 * addresses to connect to.
1109 sk_addr_free(s->addr);
1112 return plug_receive(s->plug, atmark ? 0 : 1, buf, ret);
1115 case 2: /* writable */
1116 if (!s->connected) {
1118 * select() reports a socket as _writable_ when an
1119 * asynchronous connection is completed.
1121 s->connected = s->writable = 1;
1125 int bufsize_before, bufsize_after;
1127 bufsize_before = s->sending_oob + bufchain_size(&s->output_data);
1129 bufsize_after = s->sending_oob + bufchain_size(&s->output_data);
1130 if (bufsize_after < bufsize_before)
1131 plug_sent(s->plug, bufsize_after);
1140 * Deal with socket errors detected in try_send().
1142 void net_pending_errors(void)
1148 * This might be a fiddly business, because it's just possible
1149 * that handling a pending error on one socket might cause
1150 * others to be closed. (I can't think of any reason this might
1151 * happen in current SSH implementation, but to maintain
1152 * generality of this network layer I'll assume the worst.)
1154 * So what we'll do is search the socket list for _one_ socket
1155 * with a pending error, and then handle it, and then search
1156 * the list again _from the beginning_. Repeat until we make a
1157 * pass with no socket errors present. That way we are
1158 * protected against the socket list changing under our feet.
1162 for (i = 0; (s = index234(sktree, i)) != NULL; i++) {
1163 if (s->pending_error) {
1165 * An error has occurred on this socket. Pass it to the
1168 plug_closing(s->plug, strerror(s->pending_error),
1169 s->pending_error, 0);
1177 * Each socket abstraction contains a `void *' private field in
1178 * which the client can keep state.
1180 static void sk_tcp_set_private_ptr(Socket sock, void *ptr)
1182 Actual_Socket s = (Actual_Socket) sock;
1183 s->private_ptr = ptr;
1186 static void *sk_tcp_get_private_ptr(Socket sock)
1188 Actual_Socket s = (Actual_Socket) sock;
1189 return s->private_ptr;
1193 * Special error values are returned from sk_namelookup and sk_new
1194 * if there's a problem. These functions extract an error message,
1195 * or return NULL if there's no problem.
1197 const char *sk_addr_error(SockAddr addr)
1201 static const char *sk_tcp_socket_error(Socket sock)
1203 Actual_Socket s = (Actual_Socket) sock;
1207 static void sk_tcp_set_frozen(Socket sock, int is_frozen)
1209 Actual_Socket s = (Actual_Socket) sock;
1210 if (s->frozen == is_frozen)
1212 s->frozen = is_frozen;
1213 if (!is_frozen && s->frozen_readable) {
1215 recv(s->s, &c, 1, MSG_PEEK);
1217 s->frozen_readable = 0;
1221 static void uxsel_tell(Actual_Socket s)
1225 rwx |= 2; /* write == connect */
1226 if (s->connected && !s->frozen)
1227 rwx |= 1 | 4; /* read, except */
1228 if (bufchain_size(&s->output_data))
1229 rwx |= 2; /* write */
1231 rwx |= 1; /* read == accept */
1232 uxsel_set(s->s, rwx, net_select_result);
1235 int net_service_lookup(char *service)
1238 se = getservbyname(service, NULL);
1240 return ntohs(se->s_port);
1245 SockAddr platform_get_x11_unix_address(int displaynum, char **canonicalname)
1247 SockAddr ret = snew(struct SockAddr_tag);
1250 memset(ret, 0, sizeof *ret);
1251 ret->family = AF_UNIX;
1252 n = snprintf(ret->hostname, sizeof ret->hostname,
1253 "%s%d", X11_UNIX_PATH, displaynum);
1255 ret->error = "snprintf failed";
1256 else if(n >= sizeof ret->hostname)
1257 ret->error = "X11 UNIX name too long";
1259 *canonicalname = dupstr(ret->hostname);
1263 ret->addresses = NULL;