2 * Windows networking abstraction.
4 * For the IPv6 code in here I am indebted to Jeroen Massar and
12 #define DEFINE_PLUG_METHOD_MACROS
20 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
21 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
24 #define ipv4_is_loopback(addr) \
25 ((p_ntohl(addr.s_addr) & 0xFF000000L) == 0x7F000000L)
28 const struct socket_function_table *fn;
29 /* the above variable absolutely *must* be the first in this structure */
37 int frozen; /* this causes readability notifications to be ignored */
38 int frozen_readable; /* this means we missed at least one readability
39 * notification while we were frozen */
40 int localhost_only; /* for listening sockets */
44 int pending_error; /* in case send() returns error */
48 * We used to typedef struct Socket_tag *Socket.
50 * Since we have made the networking abstraction slightly more
51 * abstract, Socket no longer means a tcp socket (it could mean
52 * an ssl socket). So now we must use Actual_Socket when we know
53 * we are talking about a tcp socket.
55 typedef struct Socket_tag *Actual_Socket;
60 * Which address family this address belongs to. AF_INET for
61 * IPv4; AF_INET6 for IPv6; AF_UNSPEC indicates that name
62 * resolution has not been done and a simple host name is held
63 * in this SockAddr structure.
64 * The hostname field is also used when the hostname has both
65 * an IPv6 and IPv4 address and the IPv6 connection attempt
66 * fails. We then try the IPv4 address.
67 * This 'family' should become an option in the GUI and
68 * on the commandline for selecting a default protocol.
71 unsigned long address; /* Address IPv4 style. */
73 struct addrinfo *ai; /* Address AF-independent (IPv4+IPv6) style. */
75 char hostname[512]; /* Store an unresolved host name. */
78 static tree234 *sktree;
80 static int cmpfortree(void *av, void *bv)
82 Actual_Socket a = (Actual_Socket) av, b = (Actual_Socket) bv;
83 unsigned long as = (unsigned long) a->s, bs = (unsigned long) b->s;
91 static int cmpforsearch(void *av, void *bv)
93 Actual_Socket b = (Actual_Socket) bv;
94 unsigned long as = (unsigned long) av, bs = (unsigned long) b->s;
103 #define DECL_WINSOCK_FUNCTION(linkage, rettype, name, params) \
104 typedef rettype (WINAPI *t_##name) params; \
105 linkage t_##name p_##name
106 #define GET_WINSOCK_FUNCTION(name) \
107 p_##name = (t_##name) GetProcAddress(winsock_module, #name)
109 DECL_WINSOCK_FUNCTION(NOTHING, int, WSAAsyncSelect,
110 (SOCKET, HWND, u_int, long));
111 DECL_WINSOCK_FUNCTION(NOTHING, int, WSAEventSelect, (SOCKET, WSAEVENT, long));
112 DECL_WINSOCK_FUNCTION(NOTHING, int, select,
113 (int, fd_set FAR *, fd_set FAR *,
114 fd_set FAR *, const struct timeval FAR *));
115 DECL_WINSOCK_FUNCTION(NOTHING, int, WSAGetLastError, (void));
116 DECL_WINSOCK_FUNCTION(NOTHING, int, WSAEnumNetworkEvents,
117 (SOCKET, WSAEVENT, LPWSANETWORKEVENTS));
118 DECL_WINSOCK_FUNCTION(static, int, WSAStartup, (WORD, LPWSADATA));
119 DECL_WINSOCK_FUNCTION(static, int, WSACleanup, (void));
120 DECL_WINSOCK_FUNCTION(static, int, closesocket, (SOCKET));
121 DECL_WINSOCK_FUNCTION(static, u_long, ntohl, (u_long));
122 DECL_WINSOCK_FUNCTION(static, u_long, htonl, (u_long));
123 DECL_WINSOCK_FUNCTION(static, u_short, htons, (u_short));
124 DECL_WINSOCK_FUNCTION(static, u_short, ntohs, (u_short));
125 DECL_WINSOCK_FUNCTION(static, struct hostent FAR *, gethostbyname,
127 DECL_WINSOCK_FUNCTION(static, struct servent FAR *, getservbyname,
128 (const char FAR *, const char FAR *));
129 DECL_WINSOCK_FUNCTION(static, unsigned long, inet_addr, (const char FAR *));
130 DECL_WINSOCK_FUNCTION(static, char FAR *, inet_ntoa, (struct in_addr));
131 DECL_WINSOCK_FUNCTION(static, int, connect,
132 (SOCKET, const struct sockaddr FAR *, int));
133 DECL_WINSOCK_FUNCTION(static, int, bind,
134 (SOCKET, const struct sockaddr FAR *, int));
135 DECL_WINSOCK_FUNCTION(static, int, setsockopt,
136 (SOCKET, int, int, const char FAR *, int));
137 DECL_WINSOCK_FUNCTION(static, SOCKET, socket, (int, int, int));
138 DECL_WINSOCK_FUNCTION(static, int, listen, (SOCKET, int));
139 DECL_WINSOCK_FUNCTION(static, int, send, (SOCKET, const char FAR *, int, int));
140 DECL_WINSOCK_FUNCTION(static, int, ioctlsocket,
141 (SOCKET, long, u_long FAR *));
142 DECL_WINSOCK_FUNCTION(static, SOCKET, accept,
143 (SOCKET, struct sockaddr FAR *, int FAR *));
144 DECL_WINSOCK_FUNCTION(static, int, recv, (SOCKET, char FAR *, int, int));
145 DECL_WINSOCK_FUNCTION(static, int, WSAIoctl,
146 (SOCKET, DWORD, LPVOID, DWORD, LPVOID, DWORD,
147 LPDWORD, LPWSAOVERLAPPED,
148 LPWSAOVERLAPPED_COMPLETION_ROUTINE));
150 static HMODULE winsock_module;
157 winsock_ver = MAKEWORD(2, 0);
158 winsock_module = LoadLibrary("WS2_32.DLL");
159 if (!winsock_module) {
160 winsock_module = LoadLibrary("WSOCK32.DLL");
161 winsock_ver = MAKEWORD(1, 1);
164 fatalbox("Unable to load any WinSock library");
166 GET_WINSOCK_FUNCTION(WSAAsyncSelect);
167 GET_WINSOCK_FUNCTION(WSAEventSelect);
168 GET_WINSOCK_FUNCTION(select);
169 GET_WINSOCK_FUNCTION(WSAGetLastError);
170 GET_WINSOCK_FUNCTION(WSAEnumNetworkEvents);
171 GET_WINSOCK_FUNCTION(WSAStartup);
172 GET_WINSOCK_FUNCTION(WSACleanup);
173 GET_WINSOCK_FUNCTION(closesocket);
174 GET_WINSOCK_FUNCTION(ntohl);
175 GET_WINSOCK_FUNCTION(htonl);
176 GET_WINSOCK_FUNCTION(htons);
177 GET_WINSOCK_FUNCTION(ntohs);
178 GET_WINSOCK_FUNCTION(gethostbyname);
179 GET_WINSOCK_FUNCTION(getservbyname);
180 GET_WINSOCK_FUNCTION(inet_addr);
181 GET_WINSOCK_FUNCTION(inet_ntoa);
182 GET_WINSOCK_FUNCTION(connect);
183 GET_WINSOCK_FUNCTION(bind);
184 GET_WINSOCK_FUNCTION(setsockopt);
185 GET_WINSOCK_FUNCTION(socket);
186 GET_WINSOCK_FUNCTION(listen);
187 GET_WINSOCK_FUNCTION(send);
188 GET_WINSOCK_FUNCTION(ioctlsocket);
189 GET_WINSOCK_FUNCTION(accept);
190 GET_WINSOCK_FUNCTION(recv);
191 GET_WINSOCK_FUNCTION(WSAIoctl);
193 if (p_WSAStartup(winsock_ver, &wsadata)) {
194 fatalbox("Unable to initialise WinSock");
196 if (LOBYTE(wsadata.wVersion) != LOBYTE(winsock_ver)) {
198 fatalbox("WinSock version is incompatible with %d.%d",
199 LOBYTE(winsock_ver), HIBYTE(winsock_ver));
202 sktree = newtree234(cmpfortree);
205 void sk_cleanup(void)
211 for (i = 0; (s = index234(sktree, i)) != NULL; i++) {
220 FreeLibrary(winsock_module);
223 char *winsock_error_string(int error)
227 return "Network error: Permission denied";
229 return "Network error: Address already in use";
230 case WSAEADDRNOTAVAIL:
231 return "Network error: Cannot assign requested address";
232 case WSAEAFNOSUPPORT:
234 "Network error: Address family not supported by protocol family";
236 return "Network error: Operation already in progress";
237 case WSAECONNABORTED:
238 return "Network error: Software caused connection abort";
239 case WSAECONNREFUSED:
240 return "Network error: Connection refused";
242 return "Network error: Connection reset by peer";
243 case WSAEDESTADDRREQ:
244 return "Network error: Destination address required";
246 return "Network error: Bad address";
248 return "Network error: Host is down";
249 case WSAEHOSTUNREACH:
250 return "Network error: No route to host";
252 return "Network error: Operation now in progress";
254 return "Network error: Interrupted function call";
256 return "Network error: Invalid argument";
258 return "Network error: Socket is already connected";
260 return "Network error: Too many open files";
262 return "Network error: Message too long";
264 return "Network error: Network is down";
266 return "Network error: Network dropped connection on reset";
268 return "Network error: Network is unreachable";
270 return "Network error: No buffer space available";
272 return "Network error: Bad protocol option";
274 return "Network error: Socket is not connected";
276 return "Network error: Socket operation on non-socket";
278 return "Network error: Operation not supported";
279 case WSAEPFNOSUPPORT:
280 return "Network error: Protocol family not supported";
282 return "Network error: Too many processes";
283 case WSAEPROTONOSUPPORT:
284 return "Network error: Protocol not supported";
286 return "Network error: Protocol wrong type for socket";
288 return "Network error: Cannot send after socket shutdown";
289 case WSAESOCKTNOSUPPORT:
290 return "Network error: Socket type not supported";
292 return "Network error: Connection timed out";
294 return "Network error: Resource temporarily unavailable";
296 return "Network error: Graceful shutdown in progress";
298 return "Unknown network error";
302 SockAddr sk_namelookup(const char *host, char **canonicalname,
305 SockAddr ret = snew(struct SockAddr_tag);
307 struct hostent *h = NULL;
312 /* Clear the structure and default to IPv4. */
313 memset(ret, 0, sizeof(struct SockAddr_tag));
314 ret->family = (address_family == ADDRTYPE_IPV4 ? AF_INET :
316 address_family == ADDRTYPE_IPV6 ? AF_INET6 :
319 ret_family = AF_UNSPEC;
322 if ((a = p_inet_addr(host)) == (unsigned long) INADDR_NONE) {
325 /* Try to get the getaddrinfo() function from wship6.dll */
326 /* This way one doesn't need to have IPv6 dll's to use PuTTY and
327 * it will fallback to IPv4. */
328 typedef int (CALLBACK * FGETADDRINFO) (const char *nodename,
329 const char *servname,
330 const struct addrinfo *hints,
331 struct addrinfo **res);
332 FGETADDRINFO fGetAddrInfo = NULL;
334 HINSTANCE dllWSHIP6 = LoadLibrary("wship6.dll");
336 fGetAddrInfo = (FGETADDRINFO) GetProcAddress(dllWSHIP6,
340 * Use fGetAddrInfo when it's available
343 struct addrinfo hints;
344 memset(&hints, 0, sizeof(hints));
345 hints.ai_family = ret->family;
346 if ((err = fGetAddrInfo(host, NULL, &hints, &ret->ai)) == 0)
347 ret_family = ret->ai->ai_family;
352 * Otherwise use the IPv4-only gethostbyname...
353 * (NOTE: we don't use gethostbyname as a fallback!)
355 if ( (h = p_gethostbyname(host)) )
356 ret_family = AF_INET;
358 err = p_WSAGetLastError();
361 if (ret_family == AF_UNSPEC) {
362 ret->error = (err == WSAENETDOWN ? "Network is down" :
363 err == WSAHOST_NOT_FOUND ? "Host does not exist" :
364 err == WSATRY_AGAIN ? "Host not found" :
366 fGetAddrInfo ? "getaddrinfo: unknown error" :
368 "gethostbyname: unknown error");
371 ret->family = ret_family;
374 /* If we got an address info use that... */
376 typedef int (CALLBACK * FGETNAMEINFO)
377 (const struct sockaddr FAR * sa, socklen_t salen,
378 char FAR * host, size_t hostlen, char FAR * serv,
379 size_t servlen, int flags);
380 FGETNAMEINFO fGetNameInfo = NULL;
382 /* Are we in IPv4 fallback mode? */
383 /* We put the IPv4 address into the a variable so we can further-on use the IPv4 code... */
384 if (ret->family == AF_INET)
386 (char *) &((SOCKADDR_IN *) ret->ai->
387 ai_addr)->sin_addr, sizeof(a));
389 /* Now let's find that canonicalname... */
392 (FGETNAMEINFO) GetProcAddress(dllWSHIP6,
395 ((struct sockaddr *) ret->ai->ai_addr,
397 AF_INET ? sizeof(SOCKADDR_IN) :
398 sizeof(SOCKADDR_IN6), realhost,
399 sizeof(realhost), NULL, 0, 0) != 0) {
400 strncpy(realhost, host, sizeof(realhost));
404 /* We used the IPv4-only gethostbyname()... */
408 memcpy(&a, h->h_addr, sizeof(a));
409 /* This way we are always sure the h->h_name is valid :) */
410 strncpy(realhost, h->h_name, sizeof(realhost));
414 FreeLibrary(dllWSHIP6);
418 * This must be a numeric IPv4 address because it caused a
419 * success return from inet_addr.
421 ret->family = AF_INET;
422 strncpy(realhost, host, sizeof(realhost));
424 ret->address = p_ntohl(a);
425 realhost[lenof(realhost)-1] = '\0';
426 *canonicalname = snewn(1+strlen(realhost), char);
427 strcpy(*canonicalname, realhost);
431 SockAddr sk_nonamelookup(const char *host)
433 SockAddr ret = snew(struct SockAddr_tag);
435 ret->family = AF_UNSPEC;
436 strncpy(ret->hostname, host, lenof(ret->hostname));
437 ret->hostname[lenof(ret->hostname)-1] = '\0';
441 void sk_getaddr(SockAddr addr, char *buf, int buflen)
444 if (addr->family == AF_INET6) {
445 /* Try to get the WSAAddressToStringA() function from wship6.dll */
446 /* This way one doesn't need to have IPv6 dll's to use PuTTY and
447 * it will fallback to IPv4. */
448 typedef int (CALLBACK * FADDRTOSTR) (LPSOCKADDR lpsaAddress,
449 DWORD dwAddressLength,
450 LPWSAPROTOCOL_INFO lpProtocolInfo,
451 OUT LPTSTR lpszAddressString,
452 IN OUT LPDWORD lpdwAddressStringLength
454 FADDRTOSTR fAddrToStr = NULL;
456 HINSTANCE dllWS2 = LoadLibrary("ws2_32.dll");
458 fAddrToStr = (FADDRTOSTR)GetProcAddress(dllWS2,
459 "WSAAddressToStringA");
461 fAddrToStr(addr->ai->ai_addr, addr->ai->ai_addrlen,
464 else strncpy(buf, "IPv6", buflen);
469 if (addr->family == AF_INET) {
471 a.s_addr = p_htonl(addr->address);
472 strncpy(buf, p_inet_ntoa(a), buflen);
473 buf[buflen-1] = '\0';
475 strncpy(buf, addr->hostname, buflen);
476 buf[buflen-1] = '\0';
480 int sk_hostname_is_local(char *name)
482 return !strcmp(name, "localhost");
485 static INTERFACE_INFO local_interfaces[16];
486 static int n_local_interfaces; /* 0=not yet, -1=failed, >0=number */
488 static int ipv4_is_local_addr(struct in_addr addr)
490 if (ipv4_is_loopback(addr))
491 return 1; /* loopback addresses are local */
492 if (!n_local_interfaces) {
493 SOCKET s = p_socket(AF_INET, SOCK_DGRAM, 0);
497 p_WSAIoctl(s, SIO_GET_INTERFACE_LIST, NULL, 0,
498 local_interfaces, sizeof(local_interfaces),
499 &retbytes, NULL, NULL) == 0)
500 n_local_interfaces = retbytes / sizeof(INTERFACE_INFO);
502 logevent(NULL, "Unable to get list of local IP addresses");
504 if (n_local_interfaces > 0) {
506 for (i = 0; i < n_local_interfaces; i++) {
507 SOCKADDR_IN *address =
508 (SOCKADDR_IN *)&local_interfaces[i].iiAddress;
509 if (address->sin_addr.s_addr == addr.s_addr)
510 return 1; /* this address is local */
513 return 0; /* this address is not local */
516 int sk_address_is_local(SockAddr addr)
519 if (addr->family == AF_INET6) {
520 return IN6_IS_ADDR_LOOPBACK((const struct in6_addr *)addr->ai->ai_addr);
523 if (addr->family == AF_INET) {
525 a.s_addr = p_htonl(addr->address);
526 return ipv4_is_local_addr(a);
528 assert(addr->family == AF_UNSPEC);
529 return 0; /* we don't know; assume not */
533 int sk_addrtype(SockAddr addr)
535 return (addr->family == AF_INET ? ADDRTYPE_IPV4 :
537 addr->family == AF_INET6 ? ADDRTYPE_IPV6 :
542 void sk_addrcopy(SockAddr addr, char *buf)
544 assert(addr->family != AF_UNSPEC);
546 if (addr->family == AF_INET6) {
547 memcpy(buf, (char*) addr->ai, 16);
550 if (addr->family == AF_INET) {
552 a.s_addr = p_htonl(addr->address);
553 memcpy(buf, (char*) &a.s_addr, 4);
557 void sk_addr_free(SockAddr addr)
562 static Plug sk_tcp_plug(Socket sock, Plug p)
564 Actual_Socket s = (Actual_Socket) sock;
571 static void sk_tcp_flush(Socket s)
574 * We send data to the socket as soon as we can anyway,
575 * so we don't need to do anything here. :-)
579 static void sk_tcp_close(Socket s);
580 static int sk_tcp_write(Socket s, const char *data, int len);
581 static int sk_tcp_write_oob(Socket s, const char *data, int len);
582 static void sk_tcp_set_private_ptr(Socket s, void *ptr);
583 static void *sk_tcp_get_private_ptr(Socket s);
584 static void sk_tcp_set_frozen(Socket s, int is_frozen);
585 static const char *sk_tcp_socket_error(Socket s);
587 extern char *do_select(SOCKET skt, int startup);
589 Socket sk_register(void *sock, Plug plug)
591 static const struct socket_function_table fn_table = {
597 sk_tcp_set_private_ptr,
598 sk_tcp_get_private_ptr,
608 * Create Socket structure.
610 ret = snew(struct Socket_tag);
614 bufchain_init(&ret->output_data);
615 ret->writable = 1; /* to start with */
616 ret->sending_oob = 0;
618 ret->frozen_readable = 0;
619 ret->localhost_only = 0; /* unused, but best init anyway */
620 ret->pending_error = 0;
622 ret->s = (SOCKET)sock;
624 if (ret->s == INVALID_SOCKET) {
625 err = p_WSAGetLastError();
626 ret->error = winsock_error_string(err);
632 /* Set up a select mechanism. This could be an AsyncSelect on a
633 * window, or an EventSelect on an event object. */
634 errstr = do_select(ret->s, 1);
645 Socket sk_new(SockAddr addr, int port, int privport, int oobinline,
646 int nodelay, int keepalive, Plug plug)
648 static const struct socket_function_table fn_table = {
654 sk_tcp_set_private_ptr,
655 sk_tcp_get_private_ptr,
671 * Create Socket structure.
673 ret = snew(struct Socket_tag);
677 bufchain_init(&ret->output_data);
678 ret->connected = 0; /* to start with */
679 ret->writable = 0; /* to start with */
680 ret->sending_oob = 0;
682 ret->frozen_readable = 0;
683 ret->localhost_only = 0; /* unused, but best init anyway */
684 ret->pending_error = 0;
690 /* Let's default to IPv6, this shouldn't hurt anybody
691 * If the stack supports IPv6 it will also allow IPv4 connections. */
692 if (addr->family == AF_UNSPEC) addr->family = AF_INET6;
694 /* No other choice, default to IPv4 */
695 if (addr->family == AF_UNSPEC) addr->family = AF_INET;
697 s = p_socket(addr->family, SOCK_STREAM, 0);
700 if (s == INVALID_SOCKET) {
701 err = p_WSAGetLastError();
702 ret->error = winsock_error_string(err);
706 ret->oobinline = oobinline;
709 p_setsockopt(s, SOL_SOCKET, SO_OOBINLINE, (void *) &b, sizeof(b));
714 p_setsockopt(s, IPPROTO_TCP, TCP_NODELAY, (void *) &b, sizeof(b));
719 p_setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, (void *) &b, sizeof(b));
723 * Bind to local address.
726 localport = 1023; /* count from 1023 downwards */
728 localport = 0; /* just use port 0 (ie winsock picks) */
730 /* Loop round trying to bind */
735 if (addr->family == AF_INET6) {
736 memset(&a6, 0, sizeof(a6));
737 a6.sin6_family = AF_INET6;
738 /*a6.sin6_addr = in6addr_any; */ /* == 0 done by memset() */
739 a6.sin6_port = p_htons(localport);
743 a.sin_family = AF_INET;
744 a.sin_addr.s_addr = p_htonl(INADDR_ANY);
745 a.sin_port = p_htons(localport);
748 retcode = p_bind(s, (addr->family == AF_INET6 ?
749 (struct sockaddr *) &a6 :
750 (struct sockaddr *) &a),
752 AF_INET6 ? sizeof(a6) : sizeof(a)));
754 retcode = p_bind(s, (struct sockaddr *) &a, sizeof(a));
756 if (retcode != SOCKET_ERROR) {
760 err = p_WSAGetLastError();
761 if (err != WSAEADDRINUSE) /* failed, for a bad reason */
766 break; /* we're only looping once */
769 break; /* we might have got to the end */
773 ret->error = winsock_error_string(err);
778 * Connect to remote address.
781 if (addr->family == AF_INET6) {
782 memset(&a, 0, sizeof(a));
783 a6.sin6_family = AF_INET6;
784 a6.sin6_port = p_htons((short) port);
786 ((struct sockaddr_in6 *) addr->ai->ai_addr)->sin6_addr;
790 a.sin_family = AF_INET;
791 a.sin_addr.s_addr = p_htonl(addr->address);
792 a.sin_port = p_htons((short) port);
795 /* Set up a select mechanism. This could be an AsyncSelect on a
796 * window, or an EventSelect on an event object. */
797 errstr = do_select(s, 1);
805 p_connect(s, ((addr->family == AF_INET6) ?
806 (struct sockaddr *) &a6 : (struct sockaddr *) &a),
807 (addr->family == AF_INET6) ? sizeof(a6) : sizeof(a))
809 p_connect(s, (struct sockaddr *) &a, sizeof(a))
812 err = p_WSAGetLastError();
814 * We expect a potential EWOULDBLOCK here, because the
815 * chances are the front end has done a select for
816 * FD_CONNECT, so that connect() will complete
819 if ( err != WSAEWOULDBLOCK ) {
820 ret->error = winsock_error_string(err);
825 * If we _don't_ get EWOULDBLOCK, the connect has completed
826 * and we should set the socket as writable.
833 /* We're done with 'addr' now. */
839 Socket sk_newlistener(char *srcaddr, int port, Plug plug, int local_host_only,
842 static const struct socket_function_table fn_table = {
848 sk_tcp_set_private_ptr,
849 sk_tcp_get_private_ptr,
867 * Create Socket structure.
869 ret = snew(struct Socket_tag);
873 bufchain_init(&ret->output_data);
874 ret->writable = 0; /* to start with */
875 ret->sending_oob = 0;
877 ret->frozen_readable = 0;
878 ret->localhost_only = local_host_only;
879 ret->pending_error = 0;
882 * Translate address_family from platform-independent constants
883 * into local reality.
885 address_family = (address_family == ADDRTYPE_IPV4 ? AF_INET :
887 address_family == ADDRTYPE_IPV6 ? AF_INET6 :
892 /* Let's default to IPv6, this shouldn't hurt anybody
893 * If the stack supports IPv6 it will also allow IPv4 connections. */
894 if (address_family == AF_UNSPEC) address_family = AF_INET6;
896 /* No other choice, default to IPv4 */
897 if (address_family == AF_UNSPEC) address_family = AF_INET;
903 s = p_socket(address_family, SOCK_STREAM, 0);
906 if (s == INVALID_SOCKET) {
907 err = p_WSAGetLastError();
908 ret->error = winsock_error_string(err);
914 p_setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (const char *)&on, sizeof(on));
917 if (address_family == AF_INET6) {
918 memset(&a6, 0, sizeof(a6));
919 a6.sin6_family = AF_INET6;
920 /* FIXME: srcaddr is ignored for IPv6, because I (SGT) don't
921 * know how to do it. :-)
922 * (jeroen:) saddr is specified as an address.. eg 2001:db8::1
923 * Thus we need either a parser that understands [2001:db8::1]:80
924 * style addresses and/or enhance this to understand hostnames too. */
926 a6.sin6_addr = in6addr_loopback;
928 a6.sin6_addr = in6addr_any;
929 a6.sin6_port = p_htons(port);
934 a.sin_family = AF_INET;
937 * Bind to source address. First try an explicitly
941 a.sin_addr.s_addr = p_inet_addr(srcaddr);
942 if (a.sin_addr.s_addr != INADDR_NONE) {
943 /* Override localhost_only with specified listen addr. */
944 ret->localhost_only = ipv4_is_loopback(a.sin_addr);
950 * ... and failing that, go with one of the standard ones.
954 a.sin_addr.s_addr = p_htonl(INADDR_LOOPBACK);
956 a.sin_addr.s_addr = p_htonl(INADDR_ANY);
959 a.sin_port = p_htons((short)port);
962 retcode = p_bind(s, (address_family == AF_INET6 ?
963 (struct sockaddr *) &a6 :
964 (struct sockaddr *) &a),
966 AF_INET6 ? sizeof(a6) : sizeof(a)));
968 retcode = p_bind(s, (struct sockaddr *) &a, sizeof(a));
970 if (retcode != SOCKET_ERROR) {
973 err = p_WSAGetLastError();
977 ret->error = winsock_error_string(err);
982 if (p_listen(s, SOMAXCONN) == SOCKET_ERROR) {
984 ret->error = winsock_error_string(err);
988 /* Set up a select mechanism. This could be an AsyncSelect on a
989 * window, or an EventSelect on an event object. */
990 errstr = do_select(s, 1);
1001 static void sk_tcp_close(Socket sock)
1003 extern char *do_select(SOCKET skt, int startup);
1004 Actual_Socket s = (Actual_Socket) sock;
1008 p_closesocket(s->s);
1013 * The function which tries to send on a socket once it's deemed
1016 void try_send(Actual_Socket s)
1018 while (s->sending_oob || bufchain_size(&s->output_data) > 0) {
1022 int len, urgentflag;
1024 if (s->sending_oob) {
1025 urgentflag = MSG_OOB;
1026 len = s->sending_oob;
1030 bufchain_prefix(&s->output_data, &data, &len);
1032 nsent = p_send(s->s, data, len, urgentflag);
1033 noise_ultralight(nsent);
1035 err = (nsent < 0 ? p_WSAGetLastError() : 0);
1036 if ((err < WSABASEERR && nsent < 0) || err == WSAEWOULDBLOCK) {
1038 * Perfectly normal: we've sent all we can for the moment.
1040 * (Some WinSock send() implementations can return
1041 * <0 but leave no sensible error indication -
1042 * WSAGetLastError() is called but returns zero or
1043 * a small number - so we check that case and treat
1044 * it just like WSAEWOULDBLOCK.)
1046 s->writable = FALSE;
1048 } else if (nsent == 0 ||
1049 err == WSAECONNABORTED || err == WSAECONNRESET) {
1051 * If send() returns CONNABORTED or CONNRESET, we
1052 * unfortunately can't just call plug_closing(),
1053 * because it's quite likely that we're currently
1054 * _in_ a call from the code we'd be calling back
1055 * to, so we'd have to make half the SSH code
1056 * reentrant. Instead we flag a pending error on
1057 * the socket, to be dealt with (by calling
1058 * plug_closing()) at some suitable future moment.
1060 s->pending_error = err;
1063 /* We're inside the Windows frontend here, so we know
1064 * that the frontend handle is unnecessary. */
1065 logevent(NULL, winsock_error_string(err));
1066 fatalbox("%s", winsock_error_string(err));
1069 if (s->sending_oob) {
1071 memmove(s->oobdata, s->oobdata+nsent, len-nsent);
1072 s->sending_oob = len - nsent;
1077 bufchain_consume(&s->output_data, nsent);
1083 static int sk_tcp_write(Socket sock, const char *buf, int len)
1085 Actual_Socket s = (Actual_Socket) sock;
1088 * Add the data to the buffer list on the socket.
1090 bufchain_add(&s->output_data, buf, len);
1093 * Now try sending from the start of the buffer list.
1098 return bufchain_size(&s->output_data);
1101 static int sk_tcp_write_oob(Socket sock, const char *buf, int len)
1103 Actual_Socket s = (Actual_Socket) sock;
1106 * Replace the buffer list on the socket with the data.
1108 bufchain_clear(&s->output_data);
1109 assert(len <= sizeof(s->oobdata));
1110 memcpy(s->oobdata, buf, len);
1111 s->sending_oob = len;
1114 * Now try sending from the start of the buffer list.
1119 return s->sending_oob;
1122 int select_result(WPARAM wParam, LPARAM lParam)
1126 char buf[20480]; /* nice big buffer for plenty of speed */
1130 /* wParam is the socket itself */
1133 return 1; /* boggle */
1135 s = find234(sktree, (void *) wParam, cmpforsearch);
1137 return 1; /* boggle */
1139 if ((err = WSAGETSELECTERROR(lParam)) != 0) {
1141 * An error has occurred on this socket. Pass it to the
1144 return plug_closing(s->plug, winsock_error_string(err), err, 0);
1147 noise_ultralight(lParam);
1149 switch (WSAGETSELECTEVENT(lParam)) {
1151 s->connected = s->writable = 1;
1154 /* In the case the socket is still frozen, we don't even bother */
1156 s->frozen_readable = 1;
1161 * We have received data on the socket. For an oobinline
1162 * socket, this might be data _before_ an urgent pointer,
1163 * in which case we send it to the back end with type==1
1164 * (data prior to urgent).
1168 p_ioctlsocket(s->s, SIOCATMARK, &atmark);
1170 * Avoid checking the return value from ioctlsocket(),
1171 * on the grounds that some WinSock wrappers don't
1172 * support it. If it does nothing, we get atmark==1,
1173 * which is equivalent to `no OOB pending', so the
1174 * effect will be to non-OOB-ify any OOB data.
1179 ret = p_recv(s->s, buf, sizeof(buf), 0);
1180 noise_ultralight(ret);
1182 err = p_WSAGetLastError();
1183 if (err == WSAEWOULDBLOCK) {
1188 return plug_closing(s->plug, winsock_error_string(err), err,
1190 } else if (0 == ret) {
1191 return plug_closing(s->plug, NULL, 0, 0);
1193 return plug_receive(s->plug, atmark ? 0 : 1, buf, ret);
1198 * This will only happen on a non-oobinline socket. It
1199 * indicates that we can immediately perform an OOB read
1200 * and get back OOB data, which we will send to the back
1201 * end with type==2 (urgent data).
1203 ret = p_recv(s->s, buf, sizeof(buf), MSG_OOB);
1204 noise_ultralight(ret);
1206 char *str = (ret == 0 ? "Internal networking trouble" :
1207 winsock_error_string(p_WSAGetLastError()));
1208 /* We're inside the Windows frontend here, so we know
1209 * that the frontend handle is unnecessary. */
1210 logevent(NULL, str);
1211 fatalbox("%s", str);
1213 return plug_receive(s->plug, 2, buf, ret);
1218 int bufsize_before, bufsize_after;
1220 bufsize_before = s->sending_oob + bufchain_size(&s->output_data);
1222 bufsize_after = s->sending_oob + bufchain_size(&s->output_data);
1223 if (bufsize_after < bufsize_before)
1224 plug_sent(s->plug, bufsize_after);
1228 /* Signal a close on the socket. First read any outstanding data. */
1231 ret = p_recv(s->s, buf, sizeof(buf), 0);
1233 err = p_WSAGetLastError();
1234 if (err == WSAEWOULDBLOCK)
1236 return plug_closing(s->plug, winsock_error_string(err),
1240 open &= plug_receive(s->plug, 0, buf, ret);
1242 open &= plug_closing(s->plug, NULL, 0, 0);
1249 struct sockaddr_in isa;
1251 struct sockaddr_storage isa;
1253 int addrlen = sizeof(isa);
1254 SOCKET t; /* socket of connection */
1256 memset(&isa, 0, sizeof(isa));
1258 t = p_accept(s->s,(struct sockaddr *)&isa,&addrlen);
1259 if (t == INVALID_SOCKET)
1261 err = p_WSAGetLastError();
1262 if (err == WSATRY_AGAIN)
1266 if (isa.ss_family == AF_INET &&
1267 s->localhost_only &&
1268 !ipv4_is_local_addr(((struct sockaddr_in *)&isa)->sin_addr)) {
1270 if (s->localhost_only && !ipv4_is_local_addr(isa.sin_addr)) {
1272 p_closesocket(t); /* dodgy WinSock let nonlocal through */
1273 } else if (plug_accepting(s->plug, (void*)t)) {
1274 p_closesocket(t); /* denied or error */
1283 * Deal with socket errors detected in try_send().
1285 void net_pending_errors(void)
1291 * This might be a fiddly business, because it's just possible
1292 * that handling a pending error on one socket might cause
1293 * others to be closed. (I can't think of any reason this might
1294 * happen in current SSH implementation, but to maintain
1295 * generality of this network layer I'll assume the worst.)
1297 * So what we'll do is search the socket list for _one_ socket
1298 * with a pending error, and then handle it, and then search
1299 * the list again _from the beginning_. Repeat until we make a
1300 * pass with no socket errors present. That way we are
1301 * protected against the socket list changing under our feet.
1305 for (i = 0; (s = index234(sktree, i)) != NULL; i++) {
1306 if (s->pending_error) {
1308 * An error has occurred on this socket. Pass it to the
1311 plug_closing(s->plug,
1312 winsock_error_string(s->pending_error),
1313 s->pending_error, 0);
1321 * Each socket abstraction contains a `void *' private field in
1322 * which the client can keep state.
1324 static void sk_tcp_set_private_ptr(Socket sock, void *ptr)
1326 Actual_Socket s = (Actual_Socket) sock;
1327 s->private_ptr = ptr;
1330 static void *sk_tcp_get_private_ptr(Socket sock)
1332 Actual_Socket s = (Actual_Socket) sock;
1333 return s->private_ptr;
1337 * Special error values are returned from sk_namelookup and sk_new
1338 * if there's a problem. These functions extract an error message,
1339 * or return NULL if there's no problem.
1341 const char *sk_addr_error(SockAddr addr)
1345 static const char *sk_tcp_socket_error(Socket sock)
1347 Actual_Socket s = (Actual_Socket) sock;
1351 static void sk_tcp_set_frozen(Socket sock, int is_frozen)
1353 Actual_Socket s = (Actual_Socket) sock;
1354 if (s->frozen == is_frozen)
1356 s->frozen = is_frozen;
1357 if (!is_frozen && s->frozen_readable) {
1359 p_recv(s->s, &c, 1, MSG_PEEK);
1361 s->frozen_readable = 0;
1365 * For Plink: enumerate all sockets currently active.
1367 SOCKET first_socket(int *state)
1371 s = index234(sktree, (*state)++);
1372 return s ? s->s : INVALID_SOCKET;
1375 SOCKET next_socket(int *state)
1377 Actual_Socket s = index234(sktree, (*state)++);
1378 return s ? s->s : INVALID_SOCKET;
1381 extern int socket_writable(SOCKET skt)
1383 Actual_Socket s = find234(sktree, (void *)skt, cmpforsearch);
1386 return bufchain_size(&s->output_data) > 0;
1391 int net_service_lookup(char *service)
1394 se = p_getservbyname(service, NULL);
1396 return p_ntohs(se->s_port);
1401 SockAddr platform_get_x11_unix_address(int displaynum, char **canonicalname)
1403 SockAddr ret = snew(struct SockAddr_tag);
1404 memset(ret, 0, sizeof(struct SockAddr_tag));
1405 ret->error = "unix sockets not supported on this platform";