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;
103 static int cmpforsearch(void *av, void *bv)
105 Actual_Socket b = (Actual_Socket) bv;
106 int as = *(int *)av, bs = b->s;
116 sktree = newtree234(cmpfortree);
119 void sk_cleanup(void)
125 for (i = 0; (s = index234(sktree, i)) != NULL; i++) {
131 SockAddr sk_namelookup(const char *host, char **canonicalname, int address_family)
133 SockAddr ret = snew(struct SockAddr_tag);
135 struct addrinfo hints;
139 struct hostent *h = NULL;
144 /* Clear the structure and default to IPv4. */
145 memset(ret, 0, sizeof(struct SockAddr_tag));
146 ret->family = 0; /* We set this one when we have resolved the host. */
151 hints.ai_flags = AI_CANONNAME;
152 hints.ai_family = (address_family == ADDRTYPE_IPV4 ? AF_INET :
153 address_family == ADDRTYPE_IPV6 ? AF_INET6 :
155 hints.ai_socktype = SOCK_STREAM;
156 hints.ai_protocol = 0;
157 hints.ai_addrlen = 0;
158 hints.ai_addr = NULL;
159 hints.ai_canonname = NULL;
160 hints.ai_next = NULL;
161 err = getaddrinfo(host, NULL, &hints, &ret->ais);
164 ret->error = gai_strerror(err);
167 ret->family = ret->ai->ai_family;
169 if (ret->ai->ai_canonname != NULL)
170 strncat(realhost, ret->ai->ai_canonname, sizeof(realhost) - 1);
172 strncat(realhost, host, sizeof(realhost) - 1);
174 if ((a = inet_addr(host)) == (unsigned long)(in_addr_t)(-1)) {
176 * Otherwise use the IPv4-only gethostbyname... (NOTE:
177 * we don't use gethostbyname as a fallback!)
179 if (ret->family == 0) {
180 /*debug(("Resolving \"%s\" with gethostbyname() (IPv4 only)...\n", host)); */
181 if ( (h = gethostbyname(host)) )
182 ret->family = AF_INET;
184 if (ret->family == 0) {
185 ret->error = (h_errno == HOST_NOT_FOUND ||
186 h_errno == NO_DATA ||
187 h_errno == NO_ADDRESS ? "Host does not exist" :
188 h_errno == TRY_AGAIN ?
189 "Temporary name service failure" :
190 "gethostbyname: unknown error");
193 /* This way we are always sure the h->h_name is valid :) */
194 strncpy(realhost, h->h_name, sizeof(realhost));
195 for (n = 0; h->h_addr_list[n]; n++);
196 ret->addresses = snewn(n, unsigned long);
198 for (n = 0; n < ret->naddresses; n++) {
199 memcpy(&a, h->h_addr_list[n], sizeof(a));
200 ret->addresses[n] = ntohl(a);
204 * This must be a numeric IPv4 address because it caused a
205 * success return from inet_addr.
207 ret->family = AF_INET;
208 strncpy(realhost, host, sizeof(realhost));
209 ret->addresses = snew(unsigned long);
211 ret->addresses[0] = ntohl(a);
215 realhost[lenof(realhost)-1] = '\0';
216 *canonicalname = snewn(1+strlen(realhost), char);
217 strcpy(*canonicalname, realhost);
221 SockAddr sk_nonamelookup(const char *host)
223 SockAddr ret = snew(struct SockAddr_tag);
225 ret->family = AF_UNSPEC;
226 strncpy(ret->hostname, host, lenof(ret->hostname));
227 ret->hostname[lenof(ret->hostname)-1] = '\0';
231 ret->addresses = NULL;
236 static int sk_nextaddr(SockAddr addr)
239 if (addr->ai && addr->ai->ai_next) {
240 addr->ai = addr->ai->ai_next;
241 addr->family = addr->ai->ai_family;
246 if (addr->curraddr+1 < addr->naddresses) {
255 void sk_getaddr(SockAddr addr, char *buf, int buflen)
258 if (addr->family == AF_UNSPEC) {
259 strncpy(buf, addr->hostname, buflen);
260 buf[buflen-1] = '\0';
263 if (getnameinfo(addr->ai->ai_addr, addr->ai->ai_addrlen, buf, buflen,
264 NULL, 0, NI_NUMERICHOST) != 0) {
266 strncat(buf, "<unknown>", buflen - 1);
270 assert(addr->family == AF_INET);
271 a.s_addr = htonl(addr->addresses[addr->curraddr]);
272 strncpy(buf, inet_ntoa(a), buflen);
273 buf[buflen-1] = '\0';
278 int sk_hostname_is_local(char *name)
280 return !strcmp(name, "localhost");
283 #define ipv4_is_loopback(addr) \
284 (((addr).s_addr & htonl(0xff000000)) == htonl(0x7f000000))
286 static int sockaddr_is_loopback(struct sockaddr *sa)
288 struct sockaddr_in *sin;
290 struct sockaddr_in6 *sin6;
293 switch (sa->sa_family) {
295 sin = (struct sockaddr_in *)sa;
296 return ipv4_is_loopback(sin->sin_addr);
299 sin6 = (struct sockaddr_in6 *)sa;
300 return IN6_IS_ADDR_LOOPBACK(&sin6->sin6_addr);
309 int sk_address_is_local(SockAddr addr)
312 if (addr->family == AF_UNSPEC)
313 return 0; /* we don't know; assume not */
316 return sockaddr_is_loopback(addr->ai->ai_addr);
319 assert(addr->family == AF_INET);
320 a.s_addr = htonl(addr->addresses[addr->curraddr]);
321 return ipv4_is_loopback(a);
326 int sk_addrtype(SockAddr addr)
328 return (addr->family == AF_INET ? ADDRTYPE_IPV4 :
330 addr->family == AF_INET6 ? ADDRTYPE_IPV6 :
335 void sk_addrcopy(SockAddr addr, char *buf)
339 if (addr->family == AF_INET)
340 memcpy(buf, &((struct sockaddr_in *)addr->ai->ai_addr)->sin_addr,
341 sizeof(struct in_addr));
342 else if (addr->family == AF_INET6)
343 memcpy(buf, &((struct sockaddr_in6 *)addr->ai->ai_addr)->sin6_addr,
344 sizeof(struct in6_addr));
350 assert(addr->family == AF_INET);
351 a.s_addr = htonl(addr->addresses[addr->curraddr]);
352 memcpy(buf, (char*) &a.s_addr, 4);
356 void sk_addr_free(SockAddr addr)
360 if (addr->ais != NULL)
361 freeaddrinfo(addr->ais);
363 sfree(addr->addresses);
368 static Plug sk_tcp_plug(Socket sock, Plug p)
370 Actual_Socket s = (Actual_Socket) sock;
377 static void sk_tcp_flush(Socket s)
380 * We send data to the socket as soon as we can anyway,
381 * so we don't need to do anything here. :-)
385 static void sk_tcp_close(Socket s);
386 static int sk_tcp_write(Socket s, const char *data, int len);
387 static int sk_tcp_write_oob(Socket s, const char *data, int len);
388 static void sk_tcp_set_private_ptr(Socket s, void *ptr);
389 static void *sk_tcp_get_private_ptr(Socket s);
390 static void sk_tcp_set_frozen(Socket s, int is_frozen);
391 static const char *sk_tcp_socket_error(Socket s);
393 static struct socket_function_table tcp_fn_table = {
399 sk_tcp_set_private_ptr,
400 sk_tcp_get_private_ptr,
405 Socket sk_register(OSSocket sockfd, Plug plug)
410 * Create Socket structure.
412 ret = snew(struct Socket_tag);
413 ret->fn = &tcp_fn_table;
416 bufchain_init(&ret->output_data);
417 ret->writable = 1; /* to start with */
418 ret->sending_oob = 0;
420 ret->frozen_readable = 0;
421 ret->localhost_only = 0; /* unused, but best init anyway */
422 ret->pending_error = 0;
423 ret->oobpending = FALSE;
431 ret->error = strerror(errno);
443 static int try_connect(Actual_Socket sock)
447 struct sockaddr_in6 a6;
449 struct sockaddr_in a;
450 struct sockaddr_un au;
451 const struct sockaddr *sa;
459 plug_log(sock->plug, 0, sock->addr, sock->port, NULL, 0);
464 assert(sock->addr->family != AF_UNSPEC);
465 s = socket(sock->addr->family, SOCK_STREAM, 0);
475 if (sock->oobinline) {
477 setsockopt(s, SOL_SOCKET, SO_OOBINLINE, (void *) &b, sizeof(b));
482 setsockopt(s, IPPROTO_TCP, TCP_NODELAY, (void *) &b, sizeof(b));
485 if (sock->keepalive) {
487 setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, (void *) &b, sizeof(b));
491 * Bind to local address.
494 localport = 1023; /* count from 1023 downwards */
496 localport = 0; /* just use port 0 (ie kernel picks) */
498 /* BSD IP stacks need sockaddr_in zeroed before filling in */
499 memset(&a,'\0',sizeof(struct sockaddr_in));
501 memset(&a6,'\0',sizeof(struct sockaddr_in6));
504 /* We don't try to bind to a local address for UNIX domain sockets. (Why
505 * do we bother doing the bind when localport == 0 anyway?) */
506 if(sock->addr->family != AF_UNIX) {
507 /* Loop round trying to bind */
512 if (sock->addr->family == AF_INET6) {
513 /* XXX use getaddrinfo to get a local address? */
514 a6.sin6_family = AF_INET6;
515 a6.sin6_addr = in6addr_any;
516 a6.sin6_port = htons(localport);
517 retcode = bind(s, (struct sockaddr *) &a6, sizeof(a6));
521 assert(sock->addr->family == AF_INET);
522 a.sin_family = AF_INET;
523 a.sin_addr.s_addr = htonl(INADDR_ANY);
524 a.sin_port = htons(localport);
525 retcode = bind(s, (struct sockaddr *) &a, sizeof(a));
532 if (err != EADDRINUSE) /* failed, for a bad reason */
537 break; /* we're only looping once */
540 break; /* we might have got to the end */
548 * Connect to remote address.
550 switch(sock->addr->family) {
553 /* XXX would be better to have got getaddrinfo() to fill in the port. */
554 ((struct sockaddr_in *)sock->addr->ai->ai_addr)->sin_port =
556 sa = (const struct sockaddr *)sock->addr->ai->ai_addr;
557 salen = sock->addr->ai->ai_addrlen;
560 ((struct sockaddr_in *)sock->addr->ai->ai_addr)->sin_port =
562 sa = (const struct sockaddr *)sock->addr->ai->ai_addr;
563 salen = sock->addr->ai->ai_addrlen;
567 a.sin_family = AF_INET;
568 a.sin_addr.s_addr = htonl(sock->addr->addresses[sock->addr->curraddr]);
569 a.sin_port = htons((short) sock->port);
570 sa = (const struct sockaddr *)&a;
575 assert(sock->port == 0); /* to catch confused people */
576 assert(strlen(sock->addr->hostname) < sizeof au.sun_path);
577 memset(&au, 0, sizeof au);
578 au.sun_family = AF_UNIX;
579 strcpy(au.sun_path, sock->addr->hostname);
580 sa = (const struct sockaddr *)&au;
585 assert(0 && "unknown address family");
586 exit(1); /* XXX: GCC doesn't understand assert() on some systems. */
589 fl = fcntl(s, F_GETFL);
591 fcntl(s, F_SETFL, fl | O_NONBLOCK);
593 if ((connect(s, sa, salen)) < 0) {
594 if ( errno != EINPROGRESS ) {
600 * If we _don't_ get EWOULDBLOCK, the connect has completed
601 * and we should set the socket as connected and writable.
608 add234(sktree, sock);
612 plug_log(sock->plug, 1, sock->addr, sock->port, strerror(err), err);
616 Socket sk_new(SockAddr addr, int port, int privport, int oobinline,
617 int nodelay, int keepalive, Plug plug)
623 * Create Socket structure.
625 ret = snew(struct Socket_tag);
626 ret->fn = &tcp_fn_table;
629 bufchain_init(&ret->output_data);
630 ret->connected = 0; /* to start with */
631 ret->writable = 0; /* to start with */
632 ret->sending_oob = 0;
634 ret->frozen_readable = 0;
635 ret->localhost_only = 0; /* unused, but best init anyway */
636 ret->pending_error = 0;
637 ret->oobpending = FALSE;
641 ret->oobinline = oobinline;
642 ret->nodelay = nodelay;
643 ret->keepalive = keepalive;
644 ret->privport = privport;
649 err = try_connect(ret);
650 } while (err && sk_nextaddr(ret->addr));
653 ret->error = strerror(err);
658 Socket sk_newlistener(char *srcaddr, int port, Plug plug, int local_host_only, int address_family)
662 struct addrinfo hints, *ai;
664 struct sockaddr_in6 a6;
666 struct sockaddr *addr;
668 struct sockaddr_in a;
674 * Create Socket structure.
676 ret = snew(struct Socket_tag);
677 ret->fn = &tcp_fn_table;
680 bufchain_init(&ret->output_data);
681 ret->writable = 0; /* to start with */
682 ret->sending_oob = 0;
684 ret->frozen_readable = 0;
685 ret->localhost_only = local_host_only;
686 ret->pending_error = 0;
687 ret->oobpending = FALSE;
692 * Translate address_family from platform-independent constants
693 * into local reality.
695 address_family = (address_family == ADDRTYPE_IPV4 ? AF_INET :
697 address_family == ADDRTYPE_IPV6 ? AF_INET6 :
702 /* Let's default to IPv6.
703 * If the stack doesn't support IPv6, we will fall back to IPv4. */
704 if (address_family == AF_UNSPEC) address_family = AF_INET6;
706 /* No other choice, default to IPv4 */
707 if (address_family == AF_UNSPEC) address_family = AF_INET;
713 s = socket(address_family, SOCK_STREAM, 0);
716 /* If the host doesn't support IPv6 try fallback to IPv4. */
717 if (s < 0 && address_family == AF_INET6) {
718 address_family = AF_INET;
719 s = socket(address_family, SOCK_STREAM, 0);
724 ret->error = strerror(errno);
732 setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (const char *)&on, sizeof(on));
735 addr = NULL; addrlen = -1; /* placate optimiser */
737 if (srcaddr != NULL) {
739 hints.ai_flags = AI_NUMERICHOST;
740 hints.ai_family = address_family;
741 hints.ai_socktype = SOCK_STREAM;
742 hints.ai_protocol = 0;
743 hints.ai_addrlen = 0;
744 hints.ai_addr = NULL;
745 hints.ai_canonname = NULL;
746 hints.ai_next = NULL;
747 assert(port >= 0 && port <= 99999);
748 sprintf(portstr, "%d", port);
749 retcode = getaddrinfo(srcaddr, portstr, &hints, &ai);
752 addrlen = ai->ai_addrlen;
755 memset(&a,'\0',sizeof(struct sockaddr_in));
756 a.sin_family = AF_INET;
757 a.sin_port = htons(port);
758 a.sin_addr.s_addr = inet_addr(srcaddr);
759 if (a.sin_addr.s_addr != (in_addr_t)(-1)) {
760 /* Override localhost_only with specified listen addr. */
761 ret->localhost_only = ipv4_is_loopback(a.sin_addr);
763 addr = (struct sockaddr *)&a;
771 if (address_family == AF_INET6) {
772 memset(&a6,'\0',sizeof(struct sockaddr_in6));
773 a6.sin6_family = AF_INET6;
774 a6.sin6_port = htons(port);
776 a6.sin6_addr = in6addr_loopback;
778 a6.sin6_addr = in6addr_any;
779 addr = (struct sockaddr *)&a6;
780 addrlen = sizeof(a6);
784 memset(&a,'\0',sizeof(struct sockaddr_in));
785 a.sin_family = AF_INET;
786 a.sin_port = htons(port);
788 a.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
790 a.sin_addr.s_addr = htonl(INADDR_ANY);
791 addr = (struct sockaddr *)&a;
796 retcode = bind(s, addr, addrlen);
799 ret->error = strerror(errno);
803 if (listen(s, SOMAXCONN) < 0) {
805 ret->error = strerror(errno);
817 static void sk_tcp_close(Socket sock)
819 Actual_Socket s = (Actual_Socket) sock;
825 sk_addr_free(s->addr);
829 void *sk_getxdmdata(void *sock, int *lenp)
831 Actual_Socket s = (Actual_Socket) sock;
833 struct sockaddr_in addr;
835 struct sockaddr_storage addr;
836 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&addr;
838 struct sockaddr *sa = (struct sockaddr *)&addr;
839 struct sockaddr_in *sin = (struct sockaddr_in *)&addr;
842 static unsigned int unix_addr = 0xFFFFFFFF;
845 * We must check that this socket really _is_ an Actual_Socket.
847 if (s->fn != &tcp_fn_table)
848 return NULL; /* failure */
850 addrlen = sizeof(addr);
851 if (getsockname(s->s, sa, &addrlen) < 0)
853 switch(sa->sa_family) {
856 buf = snewn(*lenp, char);
857 PUT_32BIT_MSB_FIRST(buf, ntohl(sin->sin_addr.s_addr));
858 PUT_16BIT_MSB_FIRST(buf+4, ntohs(sin->sin_port));
863 buf = snewn(*lenp, char);
864 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
865 memcpy(buf, sin6->sin6_addr.s6_addr + 12, 4);
866 PUT_16BIT_MSB_FIRST(buf+4, ntohs(sin6->sin6_port));
868 /* This is stupid, but it's what XLib does. */
874 buf = snewn(*lenp, char);
875 PUT_32BIT_MSB_FIRST(buf, unix_addr--);
876 PUT_16BIT_MSB_FIRST(buf+4, getpid());
889 * The function which tries to send on a socket once it's deemed
892 void try_send(Actual_Socket s)
894 while (s->sending_oob || bufchain_size(&s->output_data) > 0) {
900 if (s->sending_oob) {
901 urgentflag = MSG_OOB;
902 len = s->sending_oob;
906 bufchain_prefix(&s->output_data, &data, &len);
908 nsent = send(s->s, data, len, urgentflag);
909 noise_ultralight(nsent);
911 err = (nsent < 0 ? errno : 0);
912 if (err == EWOULDBLOCK) {
914 * Perfectly normal: we've sent all we can for the moment.
920 * We unfortunately can't just call plug_closing(),
921 * because it's quite likely that we're currently
922 * _in_ a call from the code we'd be calling back
923 * to, so we'd have to make half the SSH code
924 * reentrant. Instead we flag a pending error on
925 * the socket, to be dealt with (by calling
926 * plug_closing()) at some suitable future moment.
928 s->pending_error = err;
932 if (s->sending_oob) {
934 memmove(s->oobdata, s->oobdata+nsent, len-nsent);
935 s->sending_oob = len - nsent;
940 bufchain_consume(&s->output_data, nsent);
947 static int sk_tcp_write(Socket sock, const char *buf, int len)
949 Actual_Socket s = (Actual_Socket) sock;
952 * Add the data to the buffer list on the socket.
954 bufchain_add(&s->output_data, buf, len);
957 * Now try sending from the start of the buffer list.
963 * Update the select() status to correctly reflect whether or
964 * not we should be selecting for write.
968 return bufchain_size(&s->output_data);
971 static int sk_tcp_write_oob(Socket sock, const char *buf, int len)
973 Actual_Socket s = (Actual_Socket) sock;
976 * Replace the buffer list on the socket with the data.
978 bufchain_clear(&s->output_data);
979 assert(len <= sizeof(s->oobdata));
980 memcpy(s->oobdata, buf, len);
981 s->sending_oob = len;
984 * Now try sending from the start of the buffer list.
990 * Update the select() status to correctly reflect whether or
991 * not we should be selecting for write.
995 return s->sending_oob;
998 static int net_select_result(int fd, int event)
1001 char buf[20480]; /* nice big buffer for plenty of speed */
1005 /* Find the Socket structure */
1006 s = find234(sktree, &fd, cmpforsearch);
1008 return 1; /* boggle */
1010 noise_ultralight(event);
1013 case 4: /* exceptional */
1014 if (!s->oobinline) {
1016 * On a non-oobinline socket, this indicates that we
1017 * can immediately perform an OOB read and get back OOB
1018 * data, which we will send to the back end with
1019 * type==2 (urgent data).
1021 ret = recv(s->s, buf, sizeof(buf), MSG_OOB);
1022 noise_ultralight(ret);
1024 return plug_closing(s->plug,
1025 ret == 0 ? "Internal networking trouble" :
1026 strerror(errno), errno, 0);
1029 * Receiving actual data on a socket means we can
1030 * stop falling back through the candidate
1031 * addresses to connect to.
1034 sk_addr_free(s->addr);
1037 return plug_receive(s->plug, 2, buf, ret);
1043 * If we reach here, this is an oobinline socket, which
1044 * means we should set s->oobpending and then deal with it
1045 * when we get called for the readability event (which
1046 * should also occur).
1048 s->oobpending = TRUE;
1050 case 1: /* readable; also acceptance */
1053 * On a listening socket, the readability event means a
1054 * connection is ready to be accepted.
1057 struct sockaddr_in ss;
1059 struct sockaddr_storage ss;
1061 socklen_t addrlen = sizeof(ss);
1062 int t; /* socket of connection */
1064 memset(&ss, 0, addrlen);
1065 t = accept(s->s, (struct sockaddr *)&ss, &addrlen);
1070 if (s->localhost_only &&
1071 !sockaddr_is_loopback((struct sockaddr *)&ss)) {
1072 close(t); /* someone let nonlocal through?! */
1073 } else if (plug_accepting(s->plug, t)) {
1074 close(t); /* denied or error */
1080 * If we reach here, this is not a listening socket, so
1081 * readability really means readability.
1084 /* In the case the socket is still frozen, we don't even bother */
1086 s->frozen_readable = 1;
1091 * We have received data on the socket. For an oobinline
1092 * socket, this might be data _before_ an urgent pointer,
1093 * in which case we send it to the back end with type==1
1094 * (data prior to urgent).
1096 if (s->oobinline && s->oobpending) {
1098 if (ioctl(s->s, SIOCATMARK, &atmark) == 0 && atmark)
1099 s->oobpending = FALSE; /* clear this indicator */
1103 ret = recv(s->s, buf, s->oobpending ? 1 : sizeof(buf), 0);
1104 noise_ultralight(ret);
1106 if (errno == EWOULDBLOCK) {
1112 * An error at this point _might_ be an error reported
1113 * by a non-blocking connect(). So before we return a
1114 * panic status to the user, let's just see whether
1119 plug_log(s->plug, 1, s->addr, s->port, strerror(err), err);
1120 while (s->addr && sk_nextaddr(s->addr)) {
1121 err = try_connect(s);
1125 return plug_closing(s->plug, strerror(err), err, 0);
1126 } else if (0 == ret) {
1127 return plug_closing(s->plug, NULL, 0, 0);
1130 * Receiving actual data on a socket means we can
1131 * stop falling back through the candidate
1132 * addresses to connect to.
1135 sk_addr_free(s->addr);
1138 return plug_receive(s->plug, atmark ? 0 : 1, buf, ret);
1141 case 2: /* writable */
1142 if (!s->connected) {
1144 * select() reports a socket as _writable_ when an
1145 * asynchronous connection is completed.
1147 s->connected = s->writable = 1;
1151 int bufsize_before, bufsize_after;
1153 bufsize_before = s->sending_oob + bufchain_size(&s->output_data);
1155 bufsize_after = s->sending_oob + bufchain_size(&s->output_data);
1156 if (bufsize_after < bufsize_before)
1157 plug_sent(s->plug, bufsize_after);
1166 * Deal with socket errors detected in try_send().
1168 void net_pending_errors(void)
1174 * This might be a fiddly business, because it's just possible
1175 * that handling a pending error on one socket might cause
1176 * others to be closed. (I can't think of any reason this might
1177 * happen in current SSH implementation, but to maintain
1178 * generality of this network layer I'll assume the worst.)
1180 * So what we'll do is search the socket list for _one_ socket
1181 * with a pending error, and then handle it, and then search
1182 * the list again _from the beginning_. Repeat until we make a
1183 * pass with no socket errors present. That way we are
1184 * protected against the socket list changing under our feet.
1188 for (i = 0; (s = index234(sktree, i)) != NULL; i++) {
1189 if (s->pending_error) {
1191 * An error has occurred on this socket. Pass it to the
1194 plug_closing(s->plug, strerror(s->pending_error),
1195 s->pending_error, 0);
1203 * Each socket abstraction contains a `void *' private field in
1204 * which the client can keep state.
1206 static void sk_tcp_set_private_ptr(Socket sock, void *ptr)
1208 Actual_Socket s = (Actual_Socket) sock;
1209 s->private_ptr = ptr;
1212 static void *sk_tcp_get_private_ptr(Socket sock)
1214 Actual_Socket s = (Actual_Socket) sock;
1215 return s->private_ptr;
1219 * Special error values are returned from sk_namelookup and sk_new
1220 * if there's a problem. These functions extract an error message,
1221 * or return NULL if there's no problem.
1223 const char *sk_addr_error(SockAddr addr)
1227 static const char *sk_tcp_socket_error(Socket sock)
1229 Actual_Socket s = (Actual_Socket) sock;
1233 static void sk_tcp_set_frozen(Socket sock, int is_frozen)
1235 Actual_Socket s = (Actual_Socket) sock;
1236 if (s->frozen == is_frozen)
1238 s->frozen = is_frozen;
1239 if (!is_frozen && s->frozen_readable) {
1241 recv(s->s, &c, 1, MSG_PEEK);
1243 s->frozen_readable = 0;
1247 static void uxsel_tell(Actual_Socket s)
1251 rwx |= 1; /* read == accept */
1254 rwx |= 2; /* write == connect */
1255 if (s->connected && !s->frozen)
1256 rwx |= 1 | 4; /* read, except */
1257 if (bufchain_size(&s->output_data))
1258 rwx |= 2; /* write */
1260 uxsel_set(s->s, rwx, net_select_result);
1263 int net_service_lookup(char *service)
1266 se = getservbyname(service, NULL);
1268 return ntohs(se->s_port);
1273 SockAddr platform_get_x11_unix_address(int displaynum, char **canonicalname)
1275 SockAddr ret = snew(struct SockAddr_tag);
1278 memset(ret, 0, sizeof *ret);
1279 ret->family = AF_UNIX;
1280 n = snprintf(ret->hostname, sizeof ret->hostname,
1281 "%s%d", X11_UNIX_PATH, displaynum);
1283 ret->error = "snprintf failed";
1284 else if(n >= sizeof ret->hostname)
1285 ret->error = "X11 UNIX name too long";
1287 *canonicalname = dupstr(ret->hostname);
1289 ret->ai = ret->ais = NULL;
1291 ret->addresses = NULL;
1292 ret->curraddr = ret->naddresses = 0;