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
59 struct socket_function_table *fn;
60 /* the above variable absolutely *must* be the first in this structure */
68 int frozen; /* this causes readability notifications to be ignored */
69 int frozen_readable; /* this means we missed at least one readability
70 * notification while we were frozen */
71 int localhost_only; /* for listening sockets */
75 int pending_error; /* in case send() returns error */
79 * We used to typedef struct Socket_tag *Socket.
81 * Since we have made the networking abstraction slightly more
82 * abstract, Socket no longer means a tcp socket (it could mean
83 * an ssl socket). So now we must use Actual_Socket when we know
84 * we are talking about a tcp socket.
86 typedef struct Socket_tag *Actual_Socket;
90 /* address family this belongs to, AF_INET for IPv4, AF_INET6 for IPv6. */
92 unsigned long address; /* Address IPv4 style. */
94 struct addrinfo *ai; /* Address IPv6 style. */
98 static tree234 *sktree;
100 static int cmpfortree(void *av, void *bv)
102 Actual_Socket a = (Actual_Socket) av, b = (Actual_Socket) bv;
103 unsigned long as = (unsigned long) a->s, bs = (unsigned long) b->s;
111 static int cmpforsearch(void *av, void *bv)
113 Actual_Socket b = (Actual_Socket) bv;
114 unsigned long as = (unsigned long) av, bs = (unsigned long) b->s;
124 sktree = newtree234(cmpfortree);
127 void sk_cleanup(void)
133 for (i = 0; (s = index234(sktree, i)) != NULL; i++) {
139 char *winsock_error_string(int error)
143 return "Network error: Permission denied";
145 return "Network error: Address already in use";
146 case WSAEADDRNOTAVAIL:
147 return "Network error: Cannot assign requested address";
148 case WSAEAFNOSUPPORT:
150 "Network error: Address family not supported by protocol family";
152 return "Network error: Operation already in progress";
153 case WSAECONNABORTED:
154 return "Network error: Software caused connection abort";
155 case WSAECONNREFUSED:
156 return "Network error: Connection refused";
158 return "Network error: Connection reset by peer";
159 case WSAEDESTADDRREQ:
160 return "Network error: Destination address required";
162 return "Network error: Bad address";
164 return "Network error: Host is down";
165 case WSAEHOSTUNREACH:
166 return "Network error: No route to host";
168 return "Network error: Operation now in progress";
170 return "Network error: Interrupted function call";
172 return "Network error: Invalid argument";
174 return "Network error: Socket is already connected";
176 return "Network error: Too many open files";
178 return "Network error: Message too long";
180 return "Network error: Network is down";
182 return "Network error: Network dropped connection on reset";
184 return "Network error: Network is unreachable";
186 return "Network error: No buffer space available";
188 return "Network error: Bad protocol option";
190 return "Network error: Socket is not connected";
192 return "Network error: Socket operation on non-socket";
194 return "Network error: Operation not supported";
195 case WSAEPFNOSUPPORT:
196 return "Network error: Protocol family not supported";
198 return "Network error: Too many processes";
199 case WSAEPROTONOSUPPORT:
200 return "Network error: Protocol not supported";
202 return "Network error: Protocol wrong type for socket";
204 return "Network error: Cannot send after socket shutdown";
205 case WSAESOCKTNOSUPPORT:
206 return "Network error: Socket type not supported";
208 return "Network error: Connection timed out";
210 return "Network error: Resource temporarily unavailable";
212 return "Network error: Graceful shutdown in progress";
214 return "Unknown network error";
218 SockAddr sk_namelookup(char *host, char **canonicalname)
220 SockAddr ret = smalloc(sizeof(struct SockAddr_tag));
222 struct hostent *h = NULL;
225 /* Clear the structure and default to IPv4. */
226 memset(ret, 0, sizeof(struct SockAddr_tag));
227 ret->family = 0; /* We set this one when we have resolved the host. */
230 if ((a = inet_addr(host)) == (unsigned long) INADDR_NONE) {
233 /* Try to get the getaddrinfo() function from wship6.dll */
234 /* This way one doesn't need to have IPv6 dll's to use PuTTY and
235 * it will fallback to IPv4. */
236 typedef int (CALLBACK * FGETADDRINFO) (const char *nodename,
237 const char *servname,
238 const struct addrinfo *
240 struct addrinfo ** res);
241 FGETADDRINFO fGetAddrInfo = NULL;
243 HINSTANCE dllWSHIP6 = LoadLibrary("wship6.dll");
245 fGetAddrInfo = (FGETADDRINFO) GetProcAddress(dllWSHIP6,
249 * Use fGetAddrInfo when it's available (which usually also
250 * means IPv6 is installed...)
253 /*debug(("Resolving \"%s\" with getaddrinfo() (IPv4+IPv6 capable)...\n", host)); */
254 if (fGetAddrInfo(host, NULL, NULL, &ret->ai) == 0)
255 ret->family = ret->ai->ai_family;
260 * Otherwise use the IPv4-only gethostbyname...
261 * (NOTE: we don't use gethostbyname as a
264 if (ret->family == 0) {
265 /*debug(("Resolving \"%s\" with gethostbyname() (IPv4 only)...\n", host)); */
266 if ( (h = gethostbyname(host)) )
267 ret->family = AF_INET;
270 /*debug(("Done resolving...(family is %d) AF_INET = %d, AF_INET6 = %d\n", ret->family, AF_INET, AF_INET6)); */
272 if (ret->family == 0) {
273 DWORD err = WSAGetLastError();
274 ret->error = (err == WSAENETDOWN ? "Network is down" :
276 WSAHOST_NOT_FOUND ? "Host does not exist" : err
277 == WSATRY_AGAIN ? "Host not found" :
279 fGetAddrInfo ? "getaddrinfo: unknown error" :
281 "gethostbyname: unknown error");
285 FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER |
286 FORMAT_MESSAGE_FROM_SYSTEM |
287 FORMAT_MESSAGE_IGNORE_INSERTS, NULL, err,
288 MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
289 (LPTSTR) & lpMsgBuf, 0, NULL);
290 /*debug(("Error %ld: %s (h=%lx)\n", err, lpMsgBuf, h)); */
291 /* Free the buffer. */
299 /* If we got an address info use that... */
301 typedef int (CALLBACK * FGETNAMEINFO)
302 (const struct sockaddr FAR * sa, socklen_t salen,
303 char FAR * host, size_t hostlen, char FAR * serv,
304 size_t servlen, int flags);
305 FGETNAMEINFO fGetNameInfo = NULL;
307 /* Are we in IPv4 fallback mode? */
308 /* We put the IPv4 address into the a variable so we can further-on use the IPv4 code... */
309 if (ret->family == AF_INET)
311 (char *) &((SOCKADDR_IN *) ret->ai->
312 ai_addr)->sin_addr, sizeof(a));
314 /* Now let's find that canonicalname... */
317 (FGETNAMEINFO) GetProcAddress(dllWSHIP6,
320 ((struct sockaddr *) ret->ai->ai_addr,
322 AF_INET ? sizeof(SOCKADDR_IN) :
323 sizeof(SOCKADDR_IN6), realhost,
324 sizeof(realhost), NULL, 0, 0) != 0) {
325 strncpy(realhost, host, sizeof(realhost));
329 /* We used the IPv4-only gethostbyname()... */
333 memcpy(&a, h->h_addr, sizeof(a));
334 /* This way we are always sure the h->h_name is valid :) */
335 strncpy(realhost, h->h_name, sizeof(realhost));
339 FreeLibrary(dllWSHIP6);
343 * This must be a numeric IPv4 address because it caused a
344 * success return from inet_addr.
346 ret->family = AF_INET;
347 strncpy(realhost, host, sizeof(realhost));
349 ret->address = ntohl(a);
350 realhost[lenof(realhost)-1] = '\0';
351 *canonicalname = smalloc(1+strlen(realhost));
352 strcpy(*canonicalname, realhost);
356 void sk_getaddr(SockAddr addr, char *buf, int buflen)
359 if (addr->family == AF_INET) {
362 a.s_addr = htonl(addr->address);
363 strncpy(buf, inet_ntoa(a), buflen);
366 FIXME; /* I don't know how to get a text form of an IPv6 address. */
371 int sk_addrtype(SockAddr addr)
376 void sk_addrcopy(SockAddr addr, char *buf)
379 if (addr->family == AF_INET) {
382 a.s_addr = htonl(addr->address);
383 memcpy(buf, (char*) &a.s_addr, 4);
386 memcpy(buf, (char*) addr->ai, 16);
391 void sk_addr_free(SockAddr addr)
396 static Plug sk_tcp_plug(Socket sock, Plug p)
398 Actual_Socket s = (Actual_Socket) sock;
405 static void sk_tcp_flush(Socket s)
408 * We send data to the socket as soon as we can anyway,
409 * so we don't need to do anything here. :-)
413 static void sk_tcp_close(Socket s);
414 static int sk_tcp_write(Socket s, char *data, int len);
415 static int sk_tcp_write_oob(Socket s, char *data, int len);
416 static void sk_tcp_set_private_ptr(Socket s, void *ptr);
417 static void *sk_tcp_get_private_ptr(Socket s);
418 static void sk_tcp_set_frozen(Socket s, int is_frozen);
419 static char *sk_tcp_socket_error(Socket s);
421 extern char *do_select(SOCKET skt, int startup);
423 Socket sk_register(void *sock, Plug plug)
425 static struct socket_function_table fn_table = {
431 sk_tcp_set_private_ptr,
432 sk_tcp_get_private_ptr,
442 * Create Socket structure.
444 ret = smalloc(sizeof(struct Socket_tag));
448 bufchain_init(&ret->output_data);
449 ret->writable = 1; /* to start with */
450 ret->sending_oob = 0;
452 ret->frozen_readable = 0;
453 ret->localhost_only = 0; /* unused, but best init anyway */
454 ret->pending_error = 0;
456 ret->s = (SOCKET)sock;
458 if (ret->s == INVALID_SOCKET) {
459 err = WSAGetLastError();
460 ret->error = winsock_error_string(err);
466 /* Set up a select mechanism. This could be an AsyncSelect on a
467 * window, or an EventSelect on an event object. */
468 errstr = do_select(ret->s, 1);
479 Socket sk_new(SockAddr addr, int port, int privport, int oobinline,
480 int nodelay, Plug plug)
482 static struct socket_function_table fn_table = {
488 sk_tcp_set_private_ptr,
489 sk_tcp_get_private_ptr,
505 * Create Socket structure.
507 ret = smalloc(sizeof(struct Socket_tag));
511 bufchain_init(&ret->output_data);
512 ret->connected = 0; /* to start with */
513 ret->writable = 0; /* to start with */
514 ret->sending_oob = 0;
516 ret->frozen_readable = 0;
517 ret->localhost_only = 0; /* unused, but best init anyway */
518 ret->pending_error = 0;
523 s = socket(addr->family, SOCK_STREAM, 0);
526 if (s == INVALID_SOCKET) {
527 err = WSAGetLastError();
528 ret->error = winsock_error_string(err);
532 ret->oobinline = oobinline;
535 setsockopt(s, SOL_SOCKET, SO_OOBINLINE, (void *) &b, sizeof(b));
540 setsockopt(s, IPPROTO_TCP, TCP_NODELAY, (void *) &b, sizeof(b));
544 * Bind to local address.
547 localport = 1023; /* count from 1023 downwards */
549 localport = 0; /* just use port 0 (ie winsock picks) */
551 /* Loop round trying to bind */
556 if (addr->family == AF_INET6) {
557 memset(&a6, 0, sizeof(a6));
558 a6.sin6_family = AF_INET6;
559 /*a6.sin6_addr = in6addr_any; *//* == 0 */
560 a6.sin6_port = htons(localport);
564 a.sin_family = AF_INET;
565 a.sin_addr.s_addr = htonl(INADDR_ANY);
566 a.sin_port = htons(localport);
569 retcode = bind(s, (addr->family == AF_INET6 ?
570 (struct sockaddr *) &a6 :
571 (struct sockaddr *) &a),
573 AF_INET6 ? sizeof(a6) : sizeof(a)));
575 retcode = bind(s, (struct sockaddr *) &a, sizeof(a));
577 if (retcode != SOCKET_ERROR) {
581 err = WSAGetLastError();
582 if (err != WSAEADDRINUSE) /* failed, for a bad reason */
587 break; /* we're only looping once */
590 break; /* we might have got to the end */
594 ret->error = winsock_error_string(err);
599 * Connect to remote address.
602 if (addr->family == AF_INET6) {
603 memset(&a, 0, sizeof(a));
604 a6.sin6_family = AF_INET6;
605 a6.sin6_port = htons((short) port);
607 ((struct sockaddr_in6 *) addr->ai->ai_addr)->sin6_addr;
611 a.sin_family = AF_INET;
612 a.sin_addr.s_addr = htonl(addr->address);
613 a.sin_port = htons((short) port);
616 /* Set up a select mechanism. This could be an AsyncSelect on a
617 * window, or an EventSelect on an event object. */
618 errstr = do_select(s, 1);
626 connect(s, ((addr->family == AF_INET6) ?
627 (struct sockaddr *) &a6 : (struct sockaddr *) &a),
628 (addr->family == AF_INET6) ? sizeof(a6) : sizeof(a))
630 connect(s, (struct sockaddr *) &a, sizeof(a))
633 err = WSAGetLastError();
635 * We expect a potential EWOULDBLOCK here, because the
636 * chances are the front end has done a select for
637 * FD_CONNECT, so that connect() will complete
640 if ( err != WSAEWOULDBLOCK ) {
641 ret->error = winsock_error_string(err);
646 * If we _don't_ get EWOULDBLOCK, the connect has completed
647 * and we should set the socket as writable.
657 Socket sk_newlistener(int port, Plug plug, int local_host_only)
659 static struct socket_function_table fn_table = {
665 sk_tcp_set_private_ptr,
666 sk_tcp_get_private_ptr,
683 * Create Socket structure.
685 ret = smalloc(sizeof(struct Socket_tag));
689 bufchain_init(&ret->output_data);
690 ret->writable = 0; /* to start with */
691 ret->sending_oob = 0;
693 ret->frozen_readable = 0;
694 ret->localhost_only = local_host_only;
695 ret->pending_error = 0;
700 s = socket(AF_INET, SOCK_STREAM, 0);
703 if (s == INVALID_SOCKET) {
704 err = WSAGetLastError();
705 ret->error = winsock_error_string(err);
712 setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (const char *)&on, sizeof(on));
716 if (addr->family == AF_INET6) {
717 memset(&a6, 0, sizeof(a6));
718 a6.sin6_family = AF_INET6;
720 a6.sin6_addr = in6addr_loopback;
722 a6.sin6_addr = in6addr_any;
723 a6.sin6_port = htons(port);
727 a.sin_family = AF_INET;
729 a.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
731 a.sin_addr.s_addr = htonl(INADDR_ANY);
732 a.sin_port = htons((short)port);
735 retcode = bind(s, (addr->family == AF_INET6 ?
736 (struct sockaddr *) &a6 :
737 (struct sockaddr *) &a),
739 AF_INET6 ? sizeof(a6) : sizeof(a)));
741 retcode = bind(s, (struct sockaddr *) &a, sizeof(a));
743 if (retcode != SOCKET_ERROR) {
746 err = WSAGetLastError();
750 ret->error = winsock_error_string(err);
755 if (listen(s, SOMAXCONN) == SOCKET_ERROR) {
757 ret->error = winsock_error_string(err);
761 /* Set up a select mechanism. This could be an AsyncSelect on a
762 * window, or an EventSelect on an event object. */
763 errstr = do_select(s, 1);
774 static void sk_tcp_close(Socket sock)
776 extern char *do_select(SOCKET skt, int startup);
777 Actual_Socket s = (Actual_Socket) sock;
786 * The function which tries to send on a socket once it's deemed
789 void try_send(Actual_Socket s)
791 while (s->sending_oob || bufchain_size(&s->output_data) > 0) {
797 if (s->sending_oob) {
798 urgentflag = MSG_OOB;
799 len = s->sending_oob;
803 bufchain_prefix(&s->output_data, &data, &len);
805 nsent = send(s->s, data, len, urgentflag);
806 noise_ultralight(nsent);
808 err = (nsent < 0 ? WSAGetLastError() : 0);
809 if ((err < WSABASEERR && nsent < 0) || err == WSAEWOULDBLOCK) {
811 * Perfectly normal: we've sent all we can for the moment.
813 * (Some WinSock send() implementations can return
814 * <0 but leave no sensible error indication -
815 * WSAGetLastError() is called but returns zero or
816 * a small number - so we check that case and treat
817 * it just like WSAEWOULDBLOCK.)
821 } else if (nsent == 0 ||
822 err == WSAECONNABORTED || err == WSAECONNRESET) {
824 * If send() returns CONNABORTED or CONNRESET, we
825 * unfortunately can't just call plug_closing(),
826 * because it's quite likely that we're currently
827 * _in_ a call from the code we'd be calling back
828 * to, so we'd have to make half the SSH code
829 * reentrant. Instead we flag a pending error on
830 * the socket, to be dealt with (by calling
831 * plug_closing()) at some suitable future moment.
833 s->pending_error = err;
836 logevent(winsock_error_string(err));
837 fatalbox("%s", winsock_error_string(err));
840 if (s->sending_oob) {
842 memmove(s->oobdata, s->oobdata+nsent, len-nsent);
843 s->sending_oob = len - nsent;
848 bufchain_consume(&s->output_data, nsent);
854 static int sk_tcp_write(Socket sock, char *buf, int len)
856 Actual_Socket s = (Actual_Socket) sock;
859 * Add the data to the buffer list on the socket.
861 bufchain_add(&s->output_data, buf, len);
864 * Now try sending from the start of the buffer list.
869 return bufchain_size(&s->output_data);
872 static int sk_tcp_write_oob(Socket sock, char *buf, int len)
874 Actual_Socket s = (Actual_Socket) sock;
877 * Replace the buffer list on the socket with the data.
879 bufchain_clear(&s->output_data);
880 assert(len <= sizeof(s->oobdata));
881 memcpy(s->oobdata, buf, len);
882 s->sending_oob = len;
885 * Now try sending from the start of the buffer list.
890 return s->sending_oob;
893 int select_result(WPARAM wParam, LPARAM lParam)
897 char buf[20480]; /* nice big buffer for plenty of speed */
901 /* wParam is the socket itself */
902 s = find234(sktree, (void *) wParam, cmpforsearch);
904 return 1; /* boggle */
906 if ((err = WSAGETSELECTERROR(lParam)) != 0) {
908 * An error has occurred on this socket. Pass it to the
911 return plug_closing(s->plug, winsock_error_string(err), err, 0);
914 noise_ultralight(lParam);
916 switch (WSAGETSELECTEVENT(lParam)) {
918 s->connected = s->writable = 1;
921 /* In the case the socket is still frozen, we don't even bother */
923 s->frozen_readable = 1;
928 * We have received data on the socket. For an oobinline
929 * socket, this might be data _before_ an urgent pointer,
930 * in which case we send it to the back end with type==1
931 * (data prior to urgent).
935 ioctlsocket(s->s, SIOCATMARK, &atmark);
937 * Avoid checking the return value from ioctlsocket(),
938 * on the grounds that some WinSock wrappers don't
939 * support it. If it does nothing, we get atmark==1,
940 * which is equivalent to `no OOB pending', so the
941 * effect will be to non-OOB-ify any OOB data.
946 ret = recv(s->s, buf, sizeof(buf), 0);
947 noise_ultralight(ret);
949 err = WSAGetLastError();
950 if (err == WSAEWOULDBLOCK) {
955 return plug_closing(s->plug, winsock_error_string(err), err,
957 } else if (0 == ret) {
958 return plug_closing(s->plug, NULL, 0, 0);
960 return plug_receive(s->plug, atmark ? 0 : 1, buf, ret);
965 * This will only happen on a non-oobinline socket. It
966 * indicates that we can immediately perform an OOB read
967 * and get back OOB data, which we will send to the back
968 * end with type==2 (urgent data).
970 ret = recv(s->s, buf, sizeof(buf), MSG_OOB);
971 noise_ultralight(ret);
973 char *str = (ret == 0 ? "Internal networking trouble" :
974 winsock_error_string(WSAGetLastError()));
978 return plug_receive(s->plug, 2, buf, ret);
983 int bufsize_before, bufsize_after;
985 bufsize_before = s->sending_oob + bufchain_size(&s->output_data);
987 bufsize_after = s->sending_oob + bufchain_size(&s->output_data);
988 if (bufsize_after < bufsize_before)
989 plug_sent(s->plug, bufsize_after);
993 /* Signal a close on the socket. First read any outstanding data. */
996 ret = recv(s->s, buf, sizeof(buf), 0);
998 err = WSAGetLastError();
999 if (err == WSAEWOULDBLOCK)
1001 return plug_closing(s->plug, winsock_error_string(err),
1005 open &= plug_receive(s->plug, 0, buf, ret);
1007 open &= plug_closing(s->plug, NULL, 0, 0);
1013 struct sockaddr_in isa;
1014 int addrlen = sizeof(struct sockaddr_in);
1015 SOCKET t; /* socket of connection */
1017 memset(&isa, 0, sizeof(struct sockaddr_in));
1019 t = accept(s->s,(struct sockaddr *)&isa,&addrlen);
1020 if (t == INVALID_SOCKET)
1022 err = WSAGetLastError();
1023 if (err == WSATRY_AGAIN)
1027 if (s->localhost_only &&
1028 ntohl(isa.sin_addr.s_addr) != INADDR_LOOPBACK) {
1029 closesocket(t); /* dodgy WinSock let nonlocal through */
1030 } else if (plug_accepting(s->plug, (void*)t)) {
1031 closesocket(t); /* denied or error */
1040 * Deal with socket errors detected in try_send().
1042 void net_pending_errors(void)
1048 * This might be a fiddly business, because it's just possible
1049 * that handling a pending error on one socket might cause
1050 * others to be closed. (I can't think of any reason this might
1051 * happen in current SSH implementation, but to maintain
1052 * generality of this network layer I'll assume the worst.)
1054 * So what we'll do is search the socket list for _one_ socket
1055 * with a pending error, and then handle it, and then search
1056 * the list again _from the beginning_. Repeat until we make a
1057 * pass with no socket errors present. That way we are
1058 * protected against the socket list changing under our feet.
1062 for (i = 0; (s = index234(sktree, i)) != NULL; i++) {
1063 if (s->pending_error) {
1065 * An error has occurred on this socket. Pass it to the
1068 plug_closing(s->plug,
1069 winsock_error_string(s->pending_error),
1070 s->pending_error, 0);
1078 * Each socket abstraction contains a `void *' private field in
1079 * which the client can keep state.
1081 static void sk_tcp_set_private_ptr(Socket sock, void *ptr)
1083 Actual_Socket s = (Actual_Socket) sock;
1084 s->private_ptr = ptr;
1087 static void *sk_tcp_get_private_ptr(Socket sock)
1089 Actual_Socket s = (Actual_Socket) sock;
1090 return s->private_ptr;
1094 * Special error values are returned from sk_namelookup and sk_new
1095 * if there's a problem. These functions extract an error message,
1096 * or return NULL if there's no problem.
1098 char *sk_addr_error(SockAddr addr)
1102 static char *sk_tcp_socket_error(Socket sock)
1104 Actual_Socket s = (Actual_Socket) sock;
1108 static void sk_tcp_set_frozen(Socket sock, int is_frozen)
1110 Actual_Socket s = (Actual_Socket) sock;
1111 if (s->frozen == is_frozen)
1113 s->frozen = is_frozen;
1114 if (!is_frozen && s->frozen_readable) {
1116 recv(s->s, &c, 1, MSG_PEEK);
1118 s->frozen_readable = 0;
1122 * For Plink: enumerate all sockets currently active.
1124 SOCKET first_socket(int *state)
1128 s = index234(sktree, (*state)++);
1129 return s ? s->s : INVALID_SOCKET;
1132 SOCKET next_socket(int *state)
1134 Actual_Socket s = index234(sktree, (*state)++);
1135 return s ? s->s : INVALID_SOCKET;