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_addrtype(SockAddr addr)
376 return (addr->family == AF_INET ? ADDRTYPE_IPV4 : ADDRTYPE_IPV6);
379 void sk_addrcopy(SockAddr addr, char *buf)
382 if (addr->family == AF_INET) {
385 a.s_addr = htonl(addr->address);
386 memcpy(buf, (char*) &a.s_addr, 4);
389 memcpy(buf, (char*) addr->ai, 16);
394 void sk_addr_free(SockAddr addr)
399 static Plug sk_tcp_plug(Socket sock, Plug p)
401 Actual_Socket s = (Actual_Socket) sock;
408 static void sk_tcp_flush(Socket s)
411 * We send data to the socket as soon as we can anyway,
412 * so we don't need to do anything here. :-)
416 static void sk_tcp_close(Socket s);
417 static int sk_tcp_write(Socket s, char *data, int len);
418 static int sk_tcp_write_oob(Socket s, char *data, int len);
419 static void sk_tcp_set_private_ptr(Socket s, void *ptr);
420 static void *sk_tcp_get_private_ptr(Socket s);
421 static void sk_tcp_set_frozen(Socket s, int is_frozen);
422 static char *sk_tcp_socket_error(Socket s);
424 extern char *do_select(SOCKET skt, int startup);
426 Socket sk_register(void *sock, Plug plug)
428 static struct socket_function_table fn_table = {
434 sk_tcp_set_private_ptr,
435 sk_tcp_get_private_ptr,
445 * Create Socket structure.
447 ret = smalloc(sizeof(struct Socket_tag));
451 bufchain_init(&ret->output_data);
452 ret->writable = 1; /* to start with */
453 ret->sending_oob = 0;
455 ret->frozen_readable = 0;
456 ret->localhost_only = 0; /* unused, but best init anyway */
457 ret->pending_error = 0;
459 ret->s = (SOCKET)sock;
461 if (ret->s == INVALID_SOCKET) {
462 err = WSAGetLastError();
463 ret->error = winsock_error_string(err);
469 /* Set up a select mechanism. This could be an AsyncSelect on a
470 * window, or an EventSelect on an event object. */
471 errstr = do_select(ret->s, 1);
482 Socket sk_new(SockAddr addr, int port, int privport, int oobinline,
483 int nodelay, Plug plug)
485 static struct socket_function_table fn_table = {
491 sk_tcp_set_private_ptr,
492 sk_tcp_get_private_ptr,
508 * Create Socket structure.
510 ret = smalloc(sizeof(struct Socket_tag));
514 bufchain_init(&ret->output_data);
515 ret->connected = 0; /* to start with */
516 ret->writable = 0; /* to start with */
517 ret->sending_oob = 0;
519 ret->frozen_readable = 0;
520 ret->localhost_only = 0; /* unused, but best init anyway */
521 ret->pending_error = 0;
526 s = socket(addr->family, SOCK_STREAM, 0);
529 if (s == INVALID_SOCKET) {
530 err = WSAGetLastError();
531 ret->error = winsock_error_string(err);
535 ret->oobinline = oobinline;
538 setsockopt(s, SOL_SOCKET, SO_OOBINLINE, (void *) &b, sizeof(b));
543 setsockopt(s, IPPROTO_TCP, TCP_NODELAY, (void *) &b, sizeof(b));
547 * Bind to local address.
550 localport = 1023; /* count from 1023 downwards */
552 localport = 0; /* just use port 0 (ie winsock picks) */
554 /* Loop round trying to bind */
559 if (addr->family == AF_INET6) {
560 memset(&a6, 0, sizeof(a6));
561 a6.sin6_family = AF_INET6;
562 /*a6.sin6_addr = in6addr_any; *//* == 0 */
563 a6.sin6_port = htons(localport);
567 a.sin_family = AF_INET;
568 a.sin_addr.s_addr = htonl(INADDR_ANY);
569 a.sin_port = htons(localport);
572 retcode = bind(s, (addr->family == AF_INET6 ?
573 (struct sockaddr *) &a6 :
574 (struct sockaddr *) &a),
576 AF_INET6 ? sizeof(a6) : sizeof(a)));
578 retcode = bind(s, (struct sockaddr *) &a, sizeof(a));
580 if (retcode != SOCKET_ERROR) {
584 err = WSAGetLastError();
585 if (err != WSAEADDRINUSE) /* failed, for a bad reason */
590 break; /* we're only looping once */
593 break; /* we might have got to the end */
597 ret->error = winsock_error_string(err);
602 * Connect to remote address.
605 if (addr->family == AF_INET6) {
606 memset(&a, 0, sizeof(a));
607 a6.sin6_family = AF_INET6;
608 a6.sin6_port = htons((short) port);
610 ((struct sockaddr_in6 *) addr->ai->ai_addr)->sin6_addr;
614 a.sin_family = AF_INET;
615 a.sin_addr.s_addr = htonl(addr->address);
616 a.sin_port = htons((short) port);
619 /* Set up a select mechanism. This could be an AsyncSelect on a
620 * window, or an EventSelect on an event object. */
621 errstr = do_select(s, 1);
629 connect(s, ((addr->family == AF_INET6) ?
630 (struct sockaddr *) &a6 : (struct sockaddr *) &a),
631 (addr->family == AF_INET6) ? sizeof(a6) : sizeof(a))
633 connect(s, (struct sockaddr *) &a, sizeof(a))
636 err = WSAGetLastError();
638 * We expect a potential EWOULDBLOCK here, because the
639 * chances are the front end has done a select for
640 * FD_CONNECT, so that connect() will complete
643 if ( err != WSAEWOULDBLOCK ) {
644 ret->error = winsock_error_string(err);
649 * If we _don't_ get EWOULDBLOCK, the connect has completed
650 * and we should set the socket as writable.
660 Socket sk_newlistener(char *srcaddr, int port, Plug plug, int local_host_only)
662 static struct socket_function_table fn_table = {
668 sk_tcp_set_private_ptr,
669 sk_tcp_get_private_ptr,
686 * Create Socket structure.
688 ret = smalloc(sizeof(struct Socket_tag));
692 bufchain_init(&ret->output_data);
693 ret->writable = 0; /* to start with */
694 ret->sending_oob = 0;
696 ret->frozen_readable = 0;
697 ret->localhost_only = local_host_only;
698 ret->pending_error = 0;
703 s = socket(AF_INET, SOCK_STREAM, 0);
706 if (s == INVALID_SOCKET) {
707 err = WSAGetLastError();
708 ret->error = winsock_error_string(err);
715 setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (const char *)&on, sizeof(on));
719 if (addr->family == AF_INET6) {
720 memset(&a6, 0, sizeof(a6));
721 a6.sin6_family = AF_INET6;
722 /* FIXME: srcaddr is ignored for IPv6, because I (SGT) don't
723 * know how to do it. :-) */
725 a6.sin6_addr = in6addr_loopback;
727 a6.sin6_addr = in6addr_any;
728 a6.sin6_port = htons(port);
733 a.sin_family = AF_INET;
736 * Bind to source address. First try an explicitly
740 a.sin_addr.s_addr = inet_addr(srcaddr);
741 if (a.sin_addr.s_addr != INADDR_NONE) {
742 /* Override localhost_only with specified listen addr. */
743 ret->localhost_only = ipv4_is_loopback(a.sin_addr);
749 * ... and failing that, go with one of the standard ones.
753 a.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
755 a.sin_addr.s_addr = htonl(INADDR_ANY);
758 a.sin_port = htons((short)port);
761 retcode = bind(s, (addr->family == AF_INET6 ?
762 (struct sockaddr *) &a6 :
763 (struct sockaddr *) &a),
765 AF_INET6 ? sizeof(a6) : sizeof(a)));
767 retcode = bind(s, (struct sockaddr *) &a, sizeof(a));
769 if (retcode != SOCKET_ERROR) {
772 err = WSAGetLastError();
776 ret->error = winsock_error_string(err);
781 if (listen(s, SOMAXCONN) == SOCKET_ERROR) {
783 ret->error = winsock_error_string(err);
787 /* Set up a select mechanism. This could be an AsyncSelect on a
788 * window, or an EventSelect on an event object. */
789 errstr = do_select(s, 1);
800 static void sk_tcp_close(Socket sock)
802 extern char *do_select(SOCKET skt, int startup);
803 Actual_Socket s = (Actual_Socket) sock;
812 * The function which tries to send on a socket once it's deemed
815 void try_send(Actual_Socket s)
817 while (s->sending_oob || bufchain_size(&s->output_data) > 0) {
823 if (s->sending_oob) {
824 urgentflag = MSG_OOB;
825 len = s->sending_oob;
829 bufchain_prefix(&s->output_data, &data, &len);
831 nsent = send(s->s, data, len, urgentflag);
832 noise_ultralight(nsent);
834 err = (nsent < 0 ? WSAGetLastError() : 0);
835 if ((err < WSABASEERR && nsent < 0) || err == WSAEWOULDBLOCK) {
837 * Perfectly normal: we've sent all we can for the moment.
839 * (Some WinSock send() implementations can return
840 * <0 but leave no sensible error indication -
841 * WSAGetLastError() is called but returns zero or
842 * a small number - so we check that case and treat
843 * it just like WSAEWOULDBLOCK.)
847 } else if (nsent == 0 ||
848 err == WSAECONNABORTED || err == WSAECONNRESET) {
850 * If send() returns CONNABORTED or CONNRESET, we
851 * unfortunately can't just call plug_closing(),
852 * because it's quite likely that we're currently
853 * _in_ a call from the code we'd be calling back
854 * to, so we'd have to make half the SSH code
855 * reentrant. Instead we flag a pending error on
856 * the socket, to be dealt with (by calling
857 * plug_closing()) at some suitable future moment.
859 s->pending_error = err;
862 /* We're inside the Windows frontend here, so we know
863 * that the frontend handle is unnecessary. */
864 logevent(NULL, winsock_error_string(err));
865 fatalbox("%s", winsock_error_string(err));
868 if (s->sending_oob) {
870 memmove(s->oobdata, s->oobdata+nsent, len-nsent);
871 s->sending_oob = len - nsent;
876 bufchain_consume(&s->output_data, nsent);
882 static int sk_tcp_write(Socket sock, char *buf, int len)
884 Actual_Socket s = (Actual_Socket) sock;
887 * Add the data to the buffer list on the socket.
889 bufchain_add(&s->output_data, buf, len);
892 * Now try sending from the start of the buffer list.
897 return bufchain_size(&s->output_data);
900 static int sk_tcp_write_oob(Socket sock, char *buf, int len)
902 Actual_Socket s = (Actual_Socket) sock;
905 * Replace the buffer list on the socket with the data.
907 bufchain_clear(&s->output_data);
908 assert(len <= sizeof(s->oobdata));
909 memcpy(s->oobdata, buf, len);
910 s->sending_oob = len;
913 * Now try sending from the start of the buffer list.
918 return s->sending_oob;
921 int select_result(WPARAM wParam, LPARAM lParam)
925 char buf[20480]; /* nice big buffer for plenty of speed */
929 /* wParam is the socket itself */
932 * One user has reported an assertion failure in tree234 which
933 * indicates a null element pointer has been passed to a
934 * find*234 function. The following find234 is the only one in
935 * the whole program that I can see being capable of doing
936 * this, hence I'm forced to conclude that WinSock is capable
937 * of sending me netevent messages with wParam==0. I want to
938 * know what the rest of the message is if it does so!
942 str = dupprintf("Strange WinSock message: wp=%08x lp=%08x",
943 (int)wParam, (int)lParam);
945 connection_fatal(NULL, str);
949 s = find234(sktree, (void *) wParam, cmpforsearch);
951 return 1; /* boggle */
953 if ((err = WSAGETSELECTERROR(lParam)) != 0) {
955 * An error has occurred on this socket. Pass it to the
958 return plug_closing(s->plug, winsock_error_string(err), err, 0);
961 noise_ultralight(lParam);
963 switch (WSAGETSELECTEVENT(lParam)) {
965 s->connected = s->writable = 1;
968 /* In the case the socket is still frozen, we don't even bother */
970 s->frozen_readable = 1;
975 * We have received data on the socket. For an oobinline
976 * socket, this might be data _before_ an urgent pointer,
977 * in which case we send it to the back end with type==1
978 * (data prior to urgent).
982 ioctlsocket(s->s, SIOCATMARK, &atmark);
984 * Avoid checking the return value from ioctlsocket(),
985 * on the grounds that some WinSock wrappers don't
986 * support it. If it does nothing, we get atmark==1,
987 * which is equivalent to `no OOB pending', so the
988 * effect will be to non-OOB-ify any OOB data.
993 ret = recv(s->s, buf, sizeof(buf), 0);
994 noise_ultralight(ret);
996 err = WSAGetLastError();
997 if (err == WSAEWOULDBLOCK) {
1002 return plug_closing(s->plug, winsock_error_string(err), err,
1004 } else if (0 == ret) {
1005 return plug_closing(s->plug, NULL, 0, 0);
1007 return plug_receive(s->plug, atmark ? 0 : 1, buf, ret);
1012 * This will only happen on a non-oobinline socket. It
1013 * indicates that we can immediately perform an OOB read
1014 * and get back OOB data, which we will send to the back
1015 * end with type==2 (urgent data).
1017 ret = recv(s->s, buf, sizeof(buf), MSG_OOB);
1018 noise_ultralight(ret);
1020 char *str = (ret == 0 ? "Internal networking trouble" :
1021 winsock_error_string(WSAGetLastError()));
1022 /* We're inside the Windows frontend here, so we know
1023 * that the frontend handle is unnecessary. */
1024 logevent(NULL, str);
1025 fatalbox("%s", str);
1027 return plug_receive(s->plug, 2, buf, ret);
1032 int bufsize_before, bufsize_after;
1034 bufsize_before = s->sending_oob + bufchain_size(&s->output_data);
1036 bufsize_after = s->sending_oob + bufchain_size(&s->output_data);
1037 if (bufsize_after < bufsize_before)
1038 plug_sent(s->plug, bufsize_after);
1042 /* Signal a close on the socket. First read any outstanding data. */
1045 ret = recv(s->s, buf, sizeof(buf), 0);
1047 err = WSAGetLastError();
1048 if (err == WSAEWOULDBLOCK)
1050 return plug_closing(s->plug, winsock_error_string(err),
1054 open &= plug_receive(s->plug, 0, buf, ret);
1056 open &= plug_closing(s->plug, NULL, 0, 0);
1062 struct sockaddr_in isa;
1063 int addrlen = sizeof(struct sockaddr_in);
1064 SOCKET t; /* socket of connection */
1066 memset(&isa, 0, sizeof(struct sockaddr_in));
1068 t = accept(s->s,(struct sockaddr *)&isa,&addrlen);
1069 if (t == INVALID_SOCKET)
1071 err = WSAGetLastError();
1072 if (err == WSATRY_AGAIN)
1076 if (s->localhost_only && !ipv4_is_loopback(isa.sin_addr)) {
1077 closesocket(t); /* dodgy WinSock let nonlocal through */
1078 } else if (plug_accepting(s->plug, (void*)t)) {
1079 closesocket(t); /* denied or error */
1088 * Deal with socket errors detected in try_send().
1090 void net_pending_errors(void)
1096 * This might be a fiddly business, because it's just possible
1097 * that handling a pending error on one socket might cause
1098 * others to be closed. (I can't think of any reason this might
1099 * happen in current SSH implementation, but to maintain
1100 * generality of this network layer I'll assume the worst.)
1102 * So what we'll do is search the socket list for _one_ socket
1103 * with a pending error, and then handle it, and then search
1104 * the list again _from the beginning_. Repeat until we make a
1105 * pass with no socket errors present. That way we are
1106 * protected against the socket list changing under our feet.
1110 for (i = 0; (s = index234(sktree, i)) != NULL; i++) {
1111 if (s->pending_error) {
1113 * An error has occurred on this socket. Pass it to the
1116 plug_closing(s->plug,
1117 winsock_error_string(s->pending_error),
1118 s->pending_error, 0);
1126 * Each socket abstraction contains a `void *' private field in
1127 * which the client can keep state.
1129 static void sk_tcp_set_private_ptr(Socket sock, void *ptr)
1131 Actual_Socket s = (Actual_Socket) sock;
1132 s->private_ptr = ptr;
1135 static void *sk_tcp_get_private_ptr(Socket sock)
1137 Actual_Socket s = (Actual_Socket) sock;
1138 return s->private_ptr;
1142 * Special error values are returned from sk_namelookup and sk_new
1143 * if there's a problem. These functions extract an error message,
1144 * or return NULL if there's no problem.
1146 char *sk_addr_error(SockAddr addr)
1150 static char *sk_tcp_socket_error(Socket sock)
1152 Actual_Socket s = (Actual_Socket) sock;
1156 static void sk_tcp_set_frozen(Socket sock, int is_frozen)
1158 Actual_Socket s = (Actual_Socket) sock;
1159 if (s->frozen == is_frozen)
1161 s->frozen = is_frozen;
1162 if (!is_frozen && s->frozen_readable) {
1164 recv(s->s, &c, 1, MSG_PEEK);
1166 s->frozen_readable = 0;
1170 * For Plink: enumerate all sockets currently active.
1172 SOCKET first_socket(int *state)
1176 s = index234(sktree, (*state)++);
1177 return s ? s->s : INVALID_SOCKET;
1180 SOCKET next_socket(int *state)
1182 Actual_Socket s = index234(sktree, (*state)++);
1183 return s ? s->s : INVALID_SOCKET;
1186 int net_service_lookup(char *service)
1189 se = getservbyname(service, NULL);
1191 return ntohs(se->s_port);