2 * Windows networking abstraction.
4 * Due to this clean abstraction it was possible
5 * to easily implement IPv6 support :)
7 * IPv6 patch 1 (27 October 2000) Jeroen Massar <jeroen@unfix.org>
8 * - Preliminary hacked IPv6 support.
9 * - Connecting to IPv6 address (eg fec0:4242:4242:100:2d0:b7ff:fe8f:5d42) works.
10 * - Connecting to IPv6 hostname (eg heaven.ipv6.unfix.org) works.
11 * - Compiles as either IPv4 or IPv6.
13 * IPv6 patch 2 (29 October 2000) Jeroen Massar <jeroen@unfix.org>
14 * - When compiled as IPv6 it also allows connecting to IPv4 hosts.
15 * - Added some more documentation.
17 * IPv6 patch 3 (18 November 2000) Jeroen Massar <jeroen@unfix.org>
18 * - It now supports dynamically loading the IPv6 resolver dll's.
19 * This way we should be able to distribute one (1) binary
20 * which supports both IPv4 and IPv6.
21 * - getaddrinfo() and getnameinfo() are loaded dynamicaly if possible.
22 * - in6addr_any is defined in this file so we don't need to link to wship6.lib
23 * - The patch is now more unified so that we can still
24 * remove all IPv6 support by undef'ing IPV6.
25 * But where it fallsback to IPv4 it uses the IPv4 code which is already in place...
26 * - Canonical name resolving works.
28 * IPv6 patch 4 (07 January 2001) Jeroen Massar <jeroen@unfix.org>
29 * - patch against CVS of today, will be submitted to the bugs list
30 * as a 'cvs diff -u' on Simon's request...
35 * Define IPV6 to have IPv6 on-the-fly-loading support.
36 * This means that one doesn't have to have an IPv6 stack to use it.
37 * But if an IPv6 stack is found it is used with a fallback to IPv4.
53 #define DEFINE_PLUG_METHOD_MACROS
58 #define ipv4_is_loopback(addr) \
59 ((ntohl(addr.s_addr) & 0xFF000000L) == 0x7F000000L)
62 struct socket_function_table *fn;
63 /* the above variable absolutely *must* be the first in this structure */
71 int frozen; /* this causes readability notifications to be ignored */
72 int frozen_readable; /* this means we missed at least one readability
73 * notification while we were frozen */
74 int localhost_only; /* for listening sockets */
78 int pending_error; /* in case send() returns error */
82 * We used to typedef struct Socket_tag *Socket.
84 * Since we have made the networking abstraction slightly more
85 * abstract, Socket no longer means a tcp socket (it could mean
86 * an ssl socket). So now we must use Actual_Socket when we know
87 * we are talking about a tcp socket.
89 typedef struct Socket_tag *Actual_Socket;
93 /* address family this belongs to, AF_INET for IPv4, AF_INET6 for IPv6. */
95 unsigned long address; /* Address IPv4 style. */
97 struct addrinfo *ai; /* Address IPv6 style. */
101 static tree234 *sktree;
103 static int cmpfortree(void *av, void *bv)
105 Actual_Socket a = (Actual_Socket) av, b = (Actual_Socket) bv;
106 unsigned long as = (unsigned long) a->s, bs = (unsigned long) b->s;
114 static int cmpforsearch(void *av, void *bv)
116 Actual_Socket b = (Actual_Socket) bv;
117 unsigned long as = (unsigned long) av, bs = (unsigned long) b->s;
127 sktree = newtree234(cmpfortree);
130 void sk_cleanup(void)
136 for (i = 0; (s = index234(sktree, i)) != NULL; i++) {
142 char *winsock_error_string(int error)
146 return "Network error: Permission denied";
148 return "Network error: Address already in use";
149 case WSAEADDRNOTAVAIL:
150 return "Network error: Cannot assign requested address";
151 case WSAEAFNOSUPPORT:
153 "Network error: Address family not supported by protocol family";
155 return "Network error: Operation already in progress";
156 case WSAECONNABORTED:
157 return "Network error: Software caused connection abort";
158 case WSAECONNREFUSED:
159 return "Network error: Connection refused";
161 return "Network error: Connection reset by peer";
162 case WSAEDESTADDRREQ:
163 return "Network error: Destination address required";
165 return "Network error: Bad address";
167 return "Network error: Host is down";
168 case WSAEHOSTUNREACH:
169 return "Network error: No route to host";
171 return "Network error: Operation now in progress";
173 return "Network error: Interrupted function call";
175 return "Network error: Invalid argument";
177 return "Network error: Socket is already connected";
179 return "Network error: Too many open files";
181 return "Network error: Message too long";
183 return "Network error: Network is down";
185 return "Network error: Network dropped connection on reset";
187 return "Network error: Network is unreachable";
189 return "Network error: No buffer space available";
191 return "Network error: Bad protocol option";
193 return "Network error: Socket is not connected";
195 return "Network error: Socket operation on non-socket";
197 return "Network error: Operation not supported";
198 case WSAEPFNOSUPPORT:
199 return "Network error: Protocol family not supported";
201 return "Network error: Too many processes";
202 case WSAEPROTONOSUPPORT:
203 return "Network error: Protocol not supported";
205 return "Network error: Protocol wrong type for socket";
207 return "Network error: Cannot send after socket shutdown";
208 case WSAESOCKTNOSUPPORT:
209 return "Network error: Socket type not supported";
211 return "Network error: Connection timed out";
213 return "Network error: Resource temporarily unavailable";
215 return "Network error: Graceful shutdown in progress";
217 return "Unknown network error";
221 SockAddr sk_namelookup(char *host, char **canonicalname)
223 SockAddr ret = smalloc(sizeof(struct SockAddr_tag));
225 struct hostent *h = NULL;
228 /* Clear the structure and default to IPv4. */
229 memset(ret, 0, sizeof(struct SockAddr_tag));
230 ret->family = 0; /* We set this one when we have resolved the host. */
233 if ((a = inet_addr(host)) == (unsigned long) INADDR_NONE) {
236 /* Try to get the getaddrinfo() function from wship6.dll */
237 /* This way one doesn't need to have IPv6 dll's to use PuTTY and
238 * it will fallback to IPv4. */
239 typedef int (CALLBACK * FGETADDRINFO) (const char *nodename,
240 const char *servname,
241 const struct addrinfo *
243 struct addrinfo ** res);
244 FGETADDRINFO fGetAddrInfo = NULL;
246 HINSTANCE dllWSHIP6 = LoadLibrary("wship6.dll");
248 fGetAddrInfo = (FGETADDRINFO) GetProcAddress(dllWSHIP6,
252 * Use fGetAddrInfo when it's available (which usually also
253 * means IPv6 is installed...)
256 /*debug(("Resolving \"%s\" with getaddrinfo() (IPv4+IPv6 capable)...\n", host)); */
257 if (fGetAddrInfo(host, NULL, NULL, &ret->ai) == 0)
258 ret->family = ret->ai->ai_family;
263 * Otherwise use the IPv4-only gethostbyname...
264 * (NOTE: we don't use gethostbyname as a
267 if (ret->family == 0) {
268 /*debug(("Resolving \"%s\" with gethostbyname() (IPv4 only)...\n", host)); */
269 if ( (h = gethostbyname(host)) )
270 ret->family = AF_INET;
273 /*debug(("Done resolving...(family is %d) AF_INET = %d, AF_INET6 = %d\n", ret->family, AF_INET, AF_INET6)); */
275 if (ret->family == 0) {
276 DWORD err = WSAGetLastError();
277 ret->error = (err == WSAENETDOWN ? "Network is down" :
279 WSAHOST_NOT_FOUND ? "Host does not exist" : err
280 == WSATRY_AGAIN ? "Host not found" :
282 fGetAddrInfo ? "getaddrinfo: unknown error" :
284 "gethostbyname: unknown error");
288 FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER |
289 FORMAT_MESSAGE_FROM_SYSTEM |
290 FORMAT_MESSAGE_IGNORE_INSERTS, NULL, err,
291 MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
292 (LPTSTR) & lpMsgBuf, 0, NULL);
293 /*debug(("Error %ld: %s (h=%lx)\n", err, lpMsgBuf, h)); */
294 /* Free the buffer. */
302 /* If we got an address info use that... */
304 typedef int (CALLBACK * FGETNAMEINFO)
305 (const struct sockaddr FAR * sa, socklen_t salen,
306 char FAR * host, size_t hostlen, char FAR * serv,
307 size_t servlen, int flags);
308 FGETNAMEINFO fGetNameInfo = NULL;
310 /* Are we in IPv4 fallback mode? */
311 /* We put the IPv4 address into the a variable so we can further-on use the IPv4 code... */
312 if (ret->family == AF_INET)
314 (char *) &((SOCKADDR_IN *) ret->ai->
315 ai_addr)->sin_addr, sizeof(a));
317 /* Now let's find that canonicalname... */
320 (FGETNAMEINFO) GetProcAddress(dllWSHIP6,
323 ((struct sockaddr *) ret->ai->ai_addr,
325 AF_INET ? sizeof(SOCKADDR_IN) :
326 sizeof(SOCKADDR_IN6), realhost,
327 sizeof(realhost), NULL, 0, 0) != 0) {
328 strncpy(realhost, host, sizeof(realhost));
332 /* We used the IPv4-only gethostbyname()... */
336 memcpy(&a, h->h_addr, sizeof(a));
337 /* This way we are always sure the h->h_name is valid :) */
338 strncpy(realhost, h->h_name, sizeof(realhost));
342 FreeLibrary(dllWSHIP6);
346 * This must be a numeric IPv4 address because it caused a
347 * success return from inet_addr.
349 ret->family = AF_INET;
350 strncpy(realhost, host, sizeof(realhost));
352 ret->address = ntohl(a);
353 realhost[lenof(realhost)-1] = '\0';
354 *canonicalname = smalloc(1+strlen(realhost));
355 strcpy(*canonicalname, realhost);
359 void sk_getaddr(SockAddr addr, char *buf, int buflen)
362 if (addr->family == AF_INET) {
365 a.s_addr = htonl(addr->address);
366 strncpy(buf, inet_ntoa(a), buflen);
369 FIXME; /* I don't know how to get a text form of an IPv6 address. */
374 int sk_hostname_is_local(char *name)
376 return !strcmp(name, "localhost");
379 int sk_address_is_local(SockAddr addr)
382 if (addr->family == AF_INET) {
385 a.s_addr = htonl(addr->address);
386 return ipv4_is_loopback(a);
389 FIXME; /* someone who can compile for IPV6 had better do this bit */
394 int sk_addrtype(SockAddr addr)
396 return (addr->family == AF_INET ? ADDRTYPE_IPV4 : ADDRTYPE_IPV6);
399 void sk_addrcopy(SockAddr addr, char *buf)
402 if (addr->family == AF_INET) {
405 a.s_addr = htonl(addr->address);
406 memcpy(buf, (char*) &a.s_addr, 4);
409 memcpy(buf, (char*) addr->ai, 16);
414 void sk_addr_free(SockAddr addr)
419 static Plug sk_tcp_plug(Socket sock, Plug p)
421 Actual_Socket s = (Actual_Socket) sock;
428 static void sk_tcp_flush(Socket s)
431 * We send data to the socket as soon as we can anyway,
432 * so we don't need to do anything here. :-)
436 static void sk_tcp_close(Socket s);
437 static int sk_tcp_write(Socket s, char *data, int len);
438 static int sk_tcp_write_oob(Socket s, char *data, int len);
439 static void sk_tcp_set_private_ptr(Socket s, void *ptr);
440 static void *sk_tcp_get_private_ptr(Socket s);
441 static void sk_tcp_set_frozen(Socket s, int is_frozen);
442 static char *sk_tcp_socket_error(Socket s);
444 extern char *do_select(SOCKET skt, int startup);
446 Socket sk_register(void *sock, Plug plug)
448 static struct socket_function_table fn_table = {
454 sk_tcp_set_private_ptr,
455 sk_tcp_get_private_ptr,
465 * Create Socket structure.
467 ret = smalloc(sizeof(struct Socket_tag));
471 bufchain_init(&ret->output_data);
472 ret->writable = 1; /* to start with */
473 ret->sending_oob = 0;
475 ret->frozen_readable = 0;
476 ret->localhost_only = 0; /* unused, but best init anyway */
477 ret->pending_error = 0;
479 ret->s = (SOCKET)sock;
481 if (ret->s == INVALID_SOCKET) {
482 err = WSAGetLastError();
483 ret->error = winsock_error_string(err);
489 /* Set up a select mechanism. This could be an AsyncSelect on a
490 * window, or an EventSelect on an event object. */
491 errstr = do_select(ret->s, 1);
502 Socket sk_new(SockAddr addr, int port, int privport, int oobinline,
503 int nodelay, Plug plug)
505 static struct socket_function_table fn_table = {
511 sk_tcp_set_private_ptr,
512 sk_tcp_get_private_ptr,
528 * Create Socket structure.
530 ret = smalloc(sizeof(struct Socket_tag));
534 bufchain_init(&ret->output_data);
535 ret->connected = 0; /* to start with */
536 ret->writable = 0; /* to start with */
537 ret->sending_oob = 0;
539 ret->frozen_readable = 0;
540 ret->localhost_only = 0; /* unused, but best init anyway */
541 ret->pending_error = 0;
546 s = socket(addr->family, SOCK_STREAM, 0);
549 if (s == INVALID_SOCKET) {
550 err = WSAGetLastError();
551 ret->error = winsock_error_string(err);
555 ret->oobinline = oobinline;
558 setsockopt(s, SOL_SOCKET, SO_OOBINLINE, (void *) &b, sizeof(b));
563 setsockopt(s, IPPROTO_TCP, TCP_NODELAY, (void *) &b, sizeof(b));
567 * Bind to local address.
570 localport = 1023; /* count from 1023 downwards */
572 localport = 0; /* just use port 0 (ie winsock picks) */
574 /* Loop round trying to bind */
579 if (addr->family == AF_INET6) {
580 memset(&a6, 0, sizeof(a6));
581 a6.sin6_family = AF_INET6;
582 /*a6.sin6_addr = in6addr_any; *//* == 0 */
583 a6.sin6_port = htons(localport);
587 a.sin_family = AF_INET;
588 a.sin_addr.s_addr = htonl(INADDR_ANY);
589 a.sin_port = htons(localport);
592 retcode = bind(s, (addr->family == AF_INET6 ?
593 (struct sockaddr *) &a6 :
594 (struct sockaddr *) &a),
596 AF_INET6 ? sizeof(a6) : sizeof(a)));
598 retcode = bind(s, (struct sockaddr *) &a, sizeof(a));
600 if (retcode != SOCKET_ERROR) {
604 err = WSAGetLastError();
605 if (err != WSAEADDRINUSE) /* failed, for a bad reason */
610 break; /* we're only looping once */
613 break; /* we might have got to the end */
617 ret->error = winsock_error_string(err);
622 * Connect to remote address.
625 if (addr->family == AF_INET6) {
626 memset(&a, 0, sizeof(a));
627 a6.sin6_family = AF_INET6;
628 a6.sin6_port = htons((short) port);
630 ((struct sockaddr_in6 *) addr->ai->ai_addr)->sin6_addr;
634 a.sin_family = AF_INET;
635 a.sin_addr.s_addr = htonl(addr->address);
636 a.sin_port = htons((short) port);
639 /* Set up a select mechanism. This could be an AsyncSelect on a
640 * window, or an EventSelect on an event object. */
641 errstr = do_select(s, 1);
649 connect(s, ((addr->family == AF_INET6) ?
650 (struct sockaddr *) &a6 : (struct sockaddr *) &a),
651 (addr->family == AF_INET6) ? sizeof(a6) : sizeof(a))
653 connect(s, (struct sockaddr *) &a, sizeof(a))
656 err = WSAGetLastError();
658 * We expect a potential EWOULDBLOCK here, because the
659 * chances are the front end has done a select for
660 * FD_CONNECT, so that connect() will complete
663 if ( err != WSAEWOULDBLOCK ) {
664 ret->error = winsock_error_string(err);
669 * If we _don't_ get EWOULDBLOCK, the connect has completed
670 * and we should set the socket as writable.
680 Socket sk_newlistener(char *srcaddr, int port, Plug plug, int local_host_only)
682 static struct socket_function_table fn_table = {
688 sk_tcp_set_private_ptr,
689 sk_tcp_get_private_ptr,
706 * Create Socket structure.
708 ret = smalloc(sizeof(struct Socket_tag));
712 bufchain_init(&ret->output_data);
713 ret->writable = 0; /* to start with */
714 ret->sending_oob = 0;
716 ret->frozen_readable = 0;
717 ret->localhost_only = local_host_only;
718 ret->pending_error = 0;
723 s = socket(AF_INET, SOCK_STREAM, 0);
726 if (s == INVALID_SOCKET) {
727 err = WSAGetLastError();
728 ret->error = winsock_error_string(err);
735 setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (const char *)&on, sizeof(on));
739 if (addr->family == AF_INET6) {
740 memset(&a6, 0, sizeof(a6));
741 a6.sin6_family = AF_INET6;
742 /* FIXME: srcaddr is ignored for IPv6, because I (SGT) don't
743 * know how to do it. :-) */
745 a6.sin6_addr = in6addr_loopback;
747 a6.sin6_addr = in6addr_any;
748 a6.sin6_port = htons(port);
753 a.sin_family = AF_INET;
756 * Bind to source address. First try an explicitly
760 a.sin_addr.s_addr = inet_addr(srcaddr);
761 if (a.sin_addr.s_addr != INADDR_NONE) {
762 /* Override localhost_only with specified listen addr. */
763 ret->localhost_only = ipv4_is_loopback(a.sin_addr);
769 * ... and failing that, go with one of the standard ones.
773 a.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
775 a.sin_addr.s_addr = htonl(INADDR_ANY);
778 a.sin_port = htons((short)port);
781 retcode = bind(s, (addr->family == AF_INET6 ?
782 (struct sockaddr *) &a6 :
783 (struct sockaddr *) &a),
785 AF_INET6 ? sizeof(a6) : sizeof(a)));
787 retcode = bind(s, (struct sockaddr *) &a, sizeof(a));
789 if (retcode != SOCKET_ERROR) {
792 err = WSAGetLastError();
796 ret->error = winsock_error_string(err);
801 if (listen(s, SOMAXCONN) == SOCKET_ERROR) {
803 ret->error = winsock_error_string(err);
807 /* Set up a select mechanism. This could be an AsyncSelect on a
808 * window, or an EventSelect on an event object. */
809 errstr = do_select(s, 1);
820 static void sk_tcp_close(Socket sock)
822 extern char *do_select(SOCKET skt, int startup);
823 Actual_Socket s = (Actual_Socket) sock;
832 * The function which tries to send on a socket once it's deemed
835 void try_send(Actual_Socket s)
837 while (s->sending_oob || bufchain_size(&s->output_data) > 0) {
843 if (s->sending_oob) {
844 urgentflag = MSG_OOB;
845 len = s->sending_oob;
849 bufchain_prefix(&s->output_data, &data, &len);
851 nsent = send(s->s, data, len, urgentflag);
852 noise_ultralight(nsent);
854 err = (nsent < 0 ? WSAGetLastError() : 0);
855 if ((err < WSABASEERR && nsent < 0) || err == WSAEWOULDBLOCK) {
857 * Perfectly normal: we've sent all we can for the moment.
859 * (Some WinSock send() implementations can return
860 * <0 but leave no sensible error indication -
861 * WSAGetLastError() is called but returns zero or
862 * a small number - so we check that case and treat
863 * it just like WSAEWOULDBLOCK.)
867 } else if (nsent == 0 ||
868 err == WSAECONNABORTED || err == WSAECONNRESET) {
870 * If send() returns CONNABORTED or CONNRESET, we
871 * unfortunately can't just call plug_closing(),
872 * because it's quite likely that we're currently
873 * _in_ a call from the code we'd be calling back
874 * to, so we'd have to make half the SSH code
875 * reentrant. Instead we flag a pending error on
876 * the socket, to be dealt with (by calling
877 * plug_closing()) at some suitable future moment.
879 s->pending_error = err;
882 /* We're inside the Windows frontend here, so we know
883 * that the frontend handle is unnecessary. */
884 logevent(NULL, winsock_error_string(err));
885 fatalbox("%s", winsock_error_string(err));
888 if (s->sending_oob) {
890 memmove(s->oobdata, s->oobdata+nsent, len-nsent);
891 s->sending_oob = len - nsent;
896 bufchain_consume(&s->output_data, nsent);
902 static int sk_tcp_write(Socket sock, char *buf, int len)
904 Actual_Socket s = (Actual_Socket) sock;
907 * Add the data to the buffer list on the socket.
909 bufchain_add(&s->output_data, buf, len);
912 * Now try sending from the start of the buffer list.
917 return bufchain_size(&s->output_data);
920 static int sk_tcp_write_oob(Socket sock, char *buf, int len)
922 Actual_Socket s = (Actual_Socket) sock;
925 * Replace the buffer list on the socket with the data.
927 bufchain_clear(&s->output_data);
928 assert(len <= sizeof(s->oobdata));
929 memcpy(s->oobdata, buf, len);
930 s->sending_oob = len;
933 * Now try sending from the start of the buffer list.
938 return s->sending_oob;
941 int select_result(WPARAM wParam, LPARAM lParam)
945 char buf[20480]; /* nice big buffer for plenty of speed */
949 /* wParam is the socket itself */
952 * One user has reported an assertion failure in tree234 which
953 * indicates a null element pointer has been passed to a
954 * find*234 function. The following find234 is the only one in
955 * the whole program that I can see being capable of doing
956 * this, hence I'm forced to conclude that WinSock is capable
957 * of sending me netevent messages with wParam==0. I want to
958 * know what the rest of the message is if it does so!
962 str = dupprintf("Strange WinSock message: wp=%08x lp=%08x",
963 (int)wParam, (int)lParam);
965 connection_fatal(NULL, str);
969 s = find234(sktree, (void *) wParam, cmpforsearch);
971 return 1; /* boggle */
973 if ((err = WSAGETSELECTERROR(lParam)) != 0) {
975 * An error has occurred on this socket. Pass it to the
978 return plug_closing(s->plug, winsock_error_string(err), err, 0);
981 noise_ultralight(lParam);
983 switch (WSAGETSELECTEVENT(lParam)) {
985 s->connected = s->writable = 1;
988 /* In the case the socket is still frozen, we don't even bother */
990 s->frozen_readable = 1;
995 * We have received data on the socket. For an oobinline
996 * socket, this might be data _before_ an urgent pointer,
997 * in which case we send it to the back end with type==1
998 * (data prior to urgent).
1002 ioctlsocket(s->s, SIOCATMARK, &atmark);
1004 * Avoid checking the return value from ioctlsocket(),
1005 * on the grounds that some WinSock wrappers don't
1006 * support it. If it does nothing, we get atmark==1,
1007 * which is equivalent to `no OOB pending', so the
1008 * effect will be to non-OOB-ify any OOB data.
1013 ret = recv(s->s, buf, sizeof(buf), 0);
1014 noise_ultralight(ret);
1016 err = WSAGetLastError();
1017 if (err == WSAEWOULDBLOCK) {
1022 return plug_closing(s->plug, winsock_error_string(err), err,
1024 } else if (0 == ret) {
1025 return plug_closing(s->plug, NULL, 0, 0);
1027 return plug_receive(s->plug, atmark ? 0 : 1, buf, ret);
1032 * This will only happen on a non-oobinline socket. It
1033 * indicates that we can immediately perform an OOB read
1034 * and get back OOB data, which we will send to the back
1035 * end with type==2 (urgent data).
1037 ret = recv(s->s, buf, sizeof(buf), MSG_OOB);
1038 noise_ultralight(ret);
1040 char *str = (ret == 0 ? "Internal networking trouble" :
1041 winsock_error_string(WSAGetLastError()));
1042 /* We're inside the Windows frontend here, so we know
1043 * that the frontend handle is unnecessary. */
1044 logevent(NULL, str);
1045 fatalbox("%s", str);
1047 return plug_receive(s->plug, 2, buf, ret);
1052 int bufsize_before, bufsize_after;
1054 bufsize_before = s->sending_oob + bufchain_size(&s->output_data);
1056 bufsize_after = s->sending_oob + bufchain_size(&s->output_data);
1057 if (bufsize_after < bufsize_before)
1058 plug_sent(s->plug, bufsize_after);
1062 /* Signal a close on the socket. First read any outstanding data. */
1065 ret = recv(s->s, buf, sizeof(buf), 0);
1067 err = WSAGetLastError();
1068 if (err == WSAEWOULDBLOCK)
1070 return plug_closing(s->plug, winsock_error_string(err),
1074 open &= plug_receive(s->plug, 0, buf, ret);
1076 open &= plug_closing(s->plug, NULL, 0, 0);
1082 struct sockaddr_in isa;
1083 int addrlen = sizeof(struct sockaddr_in);
1084 SOCKET t; /* socket of connection */
1086 memset(&isa, 0, sizeof(struct sockaddr_in));
1088 t = accept(s->s,(struct sockaddr *)&isa,&addrlen);
1089 if (t == INVALID_SOCKET)
1091 err = WSAGetLastError();
1092 if (err == WSATRY_AGAIN)
1096 if (s->localhost_only && !ipv4_is_loopback(isa.sin_addr)) {
1097 closesocket(t); /* dodgy WinSock let nonlocal through */
1098 } else if (plug_accepting(s->plug, (void*)t)) {
1099 closesocket(t); /* denied or error */
1108 * Deal with socket errors detected in try_send().
1110 void net_pending_errors(void)
1116 * This might be a fiddly business, because it's just possible
1117 * that handling a pending error on one socket might cause
1118 * others to be closed. (I can't think of any reason this might
1119 * happen in current SSH implementation, but to maintain
1120 * generality of this network layer I'll assume the worst.)
1122 * So what we'll do is search the socket list for _one_ socket
1123 * with a pending error, and then handle it, and then search
1124 * the list again _from the beginning_. Repeat until we make a
1125 * pass with no socket errors present. That way we are
1126 * protected against the socket list changing under our feet.
1130 for (i = 0; (s = index234(sktree, i)) != NULL; i++) {
1131 if (s->pending_error) {
1133 * An error has occurred on this socket. Pass it to the
1136 plug_closing(s->plug,
1137 winsock_error_string(s->pending_error),
1138 s->pending_error, 0);
1146 * Each socket abstraction contains a `void *' private field in
1147 * which the client can keep state.
1149 static void sk_tcp_set_private_ptr(Socket sock, void *ptr)
1151 Actual_Socket s = (Actual_Socket) sock;
1152 s->private_ptr = ptr;
1155 static void *sk_tcp_get_private_ptr(Socket sock)
1157 Actual_Socket s = (Actual_Socket) sock;
1158 return s->private_ptr;
1162 * Special error values are returned from sk_namelookup and sk_new
1163 * if there's a problem. These functions extract an error message,
1164 * or return NULL if there's no problem.
1166 char *sk_addr_error(SockAddr addr)
1170 static char *sk_tcp_socket_error(Socket sock)
1172 Actual_Socket s = (Actual_Socket) sock;
1176 static void sk_tcp_set_frozen(Socket sock, int is_frozen)
1178 Actual_Socket s = (Actual_Socket) sock;
1179 if (s->frozen == is_frozen)
1181 s->frozen = is_frozen;
1182 if (!is_frozen && s->frozen_readable) {
1184 recv(s->s, &c, 1, MSG_PEEK);
1186 s->frozen_readable = 0;
1190 * For Plink: enumerate all sockets currently active.
1192 SOCKET first_socket(int *state)
1196 s = index234(sktree, (*state)++);
1197 return s ? s->s : INVALID_SOCKET;
1200 SOCKET next_socket(int *state)
1202 Actual_Socket s = index234(sktree, (*state)++);
1203 return s ? s->s : INVALID_SOCKET;
1206 int net_service_lookup(char *service)
1209 se = getservbyname(service, NULL);
1211 return ntohs(se->s_port);