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 * We used to typedef struct Socket_tag *Socket.
30 * Since we have made the networking abstraction slightly more
31 * abstract, Socket no longer means a tcp socket (it could mean
32 * an ssl socket). So now we must use Actual_Socket when we know
33 * we are talking about a tcp socket.
35 typedef struct Socket_tag *Actual_Socket;
38 * Mutable state that goes with a SockAddr: stores information
39 * about where in the list of candidate IP(v*) addresses we've
42 typedef struct SockAddrStep_tag SockAddrStep;
43 struct SockAddrStep_tag {
45 struct addrinfo *ai; /* steps along addr->ais */
51 const struct socket_function_table *fn;
52 /* the above variable absolutely *must* be the first in this structure */
59 int frozen; /* this causes readability notifications to be ignored */
60 int frozen_readable; /* this means we missed at least one readability
61 * notification while we were frozen */
62 int localhost_only; /* for listening sockets */
65 int oobinline, nodelay, keepalive, privport;
66 enum { EOF_NO, EOF_PENDING, EOF_SENT } outgoingeof;
70 int pending_error; /* in case send() returns error */
72 * We sometimes need pairs of Socket structures to be linked:
73 * if we are listening on the same IPv6 and v4 port, for
74 * example. So here we define `parent' and `child' pointers to
77 Actual_Socket parent, child;
85 struct addrinfo *ais; /* Addresses IPv6 style. */
87 unsigned long *addresses; /* Addresses IPv4 style. */
89 char hostname[512]; /* Store an unresolved host name. */
93 * Which address family this address belongs to. AF_INET for IPv4;
94 * AF_INET6 for IPv6; AF_UNSPEC indicates that name resolution has
95 * not been done and a simple host name is held in this SockAddr
99 #define SOCKADDR_FAMILY(addr, step) \
100 (!(addr)->resolved ? AF_UNSPEC : \
101 (step).ai ? (step).ai->ai_family : AF_INET)
103 #define SOCKADDR_FAMILY(addr, step) \
104 (!(addr)->resolved ? AF_UNSPEC : AF_INET)
108 * Start a SockAddrStep structure to step through multiple
112 #define START_STEP(addr, step) \
113 ((step).ai = (addr)->ais, (step).curraddr = 0)
115 #define START_STEP(addr, step) \
116 ((step).curraddr = 0)
119 static tree234 *sktree;
121 static int cmpfortree(void *av, void *bv)
123 Actual_Socket a = (Actual_Socket) av, b = (Actual_Socket) bv;
124 unsigned long as = (unsigned long) a->s, bs = (unsigned long) b->s;
136 static int cmpforsearch(void *av, void *bv)
138 Actual_Socket b = (Actual_Socket) bv;
139 unsigned long as = (unsigned long) av, bs = (unsigned long) b->s;
147 DECL_WINDOWS_FUNCTION(static, int, WSAStartup, (WORD, LPWSADATA));
148 DECL_WINDOWS_FUNCTION(static, int, WSACleanup, (void));
149 DECL_WINDOWS_FUNCTION(static, int, closesocket, (SOCKET));
150 DECL_WINDOWS_FUNCTION(static, u_long, ntohl, (u_long));
151 DECL_WINDOWS_FUNCTION(static, u_long, htonl, (u_long));
152 DECL_WINDOWS_FUNCTION(static, u_short, htons, (u_short));
153 DECL_WINDOWS_FUNCTION(static, u_short, ntohs, (u_short));
154 DECL_WINDOWS_FUNCTION(static, int, gethostname, (char *, int));
155 DECL_WINDOWS_FUNCTION(static, struct hostent FAR *, gethostbyname,
157 DECL_WINDOWS_FUNCTION(static, struct servent FAR *, getservbyname,
158 (const char FAR *, const char FAR *));
159 DECL_WINDOWS_FUNCTION(static, unsigned long, inet_addr, (const char FAR *));
160 DECL_WINDOWS_FUNCTION(static, char FAR *, inet_ntoa, (struct in_addr));
161 DECL_WINDOWS_FUNCTION(static, int, connect,
162 (SOCKET, const struct sockaddr FAR *, int));
163 DECL_WINDOWS_FUNCTION(static, int, bind,
164 (SOCKET, const struct sockaddr FAR *, int));
165 DECL_WINDOWS_FUNCTION(static, int, setsockopt,
166 (SOCKET, int, int, const char FAR *, int));
167 DECL_WINDOWS_FUNCTION(static, SOCKET, socket, (int, int, int));
168 DECL_WINDOWS_FUNCTION(static, int, listen, (SOCKET, int));
169 DECL_WINDOWS_FUNCTION(static, int, send, (SOCKET, const char FAR *, int, int));
170 DECL_WINDOWS_FUNCTION(static, int, shutdown, (SOCKET, int));
171 DECL_WINDOWS_FUNCTION(static, int, ioctlsocket,
172 (SOCKET, long, u_long FAR *));
173 DECL_WINDOWS_FUNCTION(static, SOCKET, accept,
174 (SOCKET, struct sockaddr FAR *, int FAR *));
175 DECL_WINDOWS_FUNCTION(static, int, recv, (SOCKET, char FAR *, int, int));
176 DECL_WINDOWS_FUNCTION(static, int, WSAIoctl,
177 (SOCKET, DWORD, LPVOID, DWORD, LPVOID, DWORD,
178 LPDWORD, LPWSAOVERLAPPED,
179 LPWSAOVERLAPPED_COMPLETION_ROUTINE));
181 DECL_WINDOWS_FUNCTION(static, int, getaddrinfo,
182 (const char *nodename, const char *servname,
183 const struct addrinfo *hints, struct addrinfo **res));
184 DECL_WINDOWS_FUNCTION(static, void, freeaddrinfo, (struct addrinfo *res));
185 DECL_WINDOWS_FUNCTION(static, int, getnameinfo,
186 (const struct sockaddr FAR * sa, socklen_t salen,
187 char FAR * host, size_t hostlen, char FAR * serv,
188 size_t servlen, int flags));
189 DECL_WINDOWS_FUNCTION(static, char *, gai_strerror, (int ecode));
190 DECL_WINDOWS_FUNCTION(static, int, WSAAddressToStringA,
191 (LPSOCKADDR, DWORD, LPWSAPROTOCOL_INFO,
195 static HMODULE winsock_module = NULL;
196 static WSADATA wsadata;
198 static HMODULE winsock2_module = NULL;
199 static HMODULE wship6_module = NULL;
202 int sk_startup(int hi, int lo)
206 winsock_ver = MAKEWORD(hi, lo);
208 if (p_WSAStartup(winsock_ver, &wsadata)) {
212 if (LOBYTE(wsadata.wVersion) != LOBYTE(winsock_ver)) {
216 #ifdef NET_SETUP_DIAGNOSTICS
219 sprintf(buf, "Using WinSock %d.%d", hi, lo);
231 winsock_module = load_system32_dll("ws2_32.dll");
232 if (!winsock_module) {
233 winsock_module = load_system32_dll("wsock32.dll");
236 fatalbox("Unable to load any WinSock library");
239 /* Check if we have getaddrinfo in Winsock */
240 if (GetProcAddress(winsock_module, "getaddrinfo") != NULL) {
241 #ifdef NET_SETUP_DIAGNOSTICS
242 logevent(NULL, "Native WinSock IPv6 support detected");
244 GET_WINDOWS_FUNCTION(winsock_module, getaddrinfo);
245 GET_WINDOWS_FUNCTION(winsock_module, freeaddrinfo);
246 GET_WINDOWS_FUNCTION(winsock_module, getnameinfo);
247 GET_WINDOWS_FUNCTION(winsock_module, gai_strerror);
249 /* Fall back to wship6.dll for Windows 2000 */
250 wship6_module = load_system32_dll("wship6.dll");
252 #ifdef NET_SETUP_DIAGNOSTICS
253 logevent(NULL, "WSH IPv6 support detected");
255 GET_WINDOWS_FUNCTION(wship6_module, getaddrinfo);
256 GET_WINDOWS_FUNCTION(wship6_module, freeaddrinfo);
257 GET_WINDOWS_FUNCTION(wship6_module, getnameinfo);
258 GET_WINDOWS_FUNCTION(wship6_module, gai_strerror);
260 #ifdef NET_SETUP_DIAGNOSTICS
261 logevent(NULL, "No IPv6 support detected");
265 GET_WINDOWS_FUNCTION(winsock2_module, WSAAddressToStringA);
267 #ifdef NET_SETUP_DIAGNOSTICS
268 logevent(NULL, "PuTTY was built without IPv6 support");
272 GET_WINDOWS_FUNCTION(winsock_module, WSAAsyncSelect);
273 GET_WINDOWS_FUNCTION(winsock_module, WSAEventSelect);
274 GET_WINDOWS_FUNCTION(winsock_module, select);
275 GET_WINDOWS_FUNCTION(winsock_module, WSAGetLastError);
276 GET_WINDOWS_FUNCTION(winsock_module, WSAEnumNetworkEvents);
277 GET_WINDOWS_FUNCTION(winsock_module, WSAStartup);
278 GET_WINDOWS_FUNCTION(winsock_module, WSACleanup);
279 GET_WINDOWS_FUNCTION(winsock_module, closesocket);
280 GET_WINDOWS_FUNCTION(winsock_module, ntohl);
281 GET_WINDOWS_FUNCTION(winsock_module, htonl);
282 GET_WINDOWS_FUNCTION(winsock_module, htons);
283 GET_WINDOWS_FUNCTION(winsock_module, ntohs);
284 GET_WINDOWS_FUNCTION(winsock_module, gethostname);
285 GET_WINDOWS_FUNCTION(winsock_module, gethostbyname);
286 GET_WINDOWS_FUNCTION(winsock_module, getservbyname);
287 GET_WINDOWS_FUNCTION(winsock_module, inet_addr);
288 GET_WINDOWS_FUNCTION(winsock_module, inet_ntoa);
289 GET_WINDOWS_FUNCTION(winsock_module, connect);
290 GET_WINDOWS_FUNCTION(winsock_module, bind);
291 GET_WINDOWS_FUNCTION(winsock_module, setsockopt);
292 GET_WINDOWS_FUNCTION(winsock_module, socket);
293 GET_WINDOWS_FUNCTION(winsock_module, listen);
294 GET_WINDOWS_FUNCTION(winsock_module, send);
295 GET_WINDOWS_FUNCTION(winsock_module, shutdown);
296 GET_WINDOWS_FUNCTION(winsock_module, ioctlsocket);
297 GET_WINDOWS_FUNCTION(winsock_module, accept);
298 GET_WINDOWS_FUNCTION(winsock_module, recv);
299 GET_WINDOWS_FUNCTION(winsock_module, WSAIoctl);
301 /* Try to get the best WinSock version we can get */
302 if (!sk_startup(2,2) &&
305 fatalbox("Unable to initialise WinSock");
308 sktree = newtree234(cmpfortree);
311 void sk_cleanup(void)
317 for (i = 0; (s = index234(sktree, i)) != NULL; i++) {
327 FreeLibrary(winsock_module);
330 FreeLibrary(wship6_module);
339 static int errstring_find(void *av, void *bv)
342 struct errstring *b = (struct errstring *)bv;
349 static int errstring_compare(void *av, void *bv)
351 struct errstring *a = (struct errstring *)av;
352 return errstring_find(&a->error, bv);
355 static tree234 *errstrings = NULL;
357 char *winsock_error_string(int error)
359 const char prefix[] = "Network error: ";
360 struct errstring *es;
363 * Error codes we know about and have historically had reasonably
364 * sensible error messages for.
368 return "Network error: Permission denied";
370 return "Network error: Address already in use";
371 case WSAEADDRNOTAVAIL:
372 return "Network error: Cannot assign requested address";
373 case WSAEAFNOSUPPORT:
375 "Network error: Address family not supported by protocol family";
377 return "Network error: Operation already in progress";
378 case WSAECONNABORTED:
379 return "Network error: Software caused connection abort";
380 case WSAECONNREFUSED:
381 return "Network error: Connection refused";
383 return "Network error: Connection reset by peer";
384 case WSAEDESTADDRREQ:
385 return "Network error: Destination address required";
387 return "Network error: Bad address";
389 return "Network error: Host is down";
390 case WSAEHOSTUNREACH:
391 return "Network error: No route to host";
393 return "Network error: Operation now in progress";
395 return "Network error: Interrupted function call";
397 return "Network error: Invalid argument";
399 return "Network error: Socket is already connected";
401 return "Network error: Too many open files";
403 return "Network error: Message too long";
405 return "Network error: Network is down";
407 return "Network error: Network dropped connection on reset";
409 return "Network error: Network is unreachable";
411 return "Network error: No buffer space available";
413 return "Network error: Bad protocol option";
415 return "Network error: Socket is not connected";
417 return "Network error: Socket operation on non-socket";
419 return "Network error: Operation not supported";
420 case WSAEPFNOSUPPORT:
421 return "Network error: Protocol family not supported";
423 return "Network error: Too many processes";
424 case WSAEPROTONOSUPPORT:
425 return "Network error: Protocol not supported";
427 return "Network error: Protocol wrong type for socket";
429 return "Network error: Cannot send after socket shutdown";
430 case WSAESOCKTNOSUPPORT:
431 return "Network error: Socket type not supported";
433 return "Network error: Connection timed out";
435 return "Network error: Resource temporarily unavailable";
437 return "Network error: Graceful shutdown in progress";
441 * Generic code to handle any other error.
443 * Slightly nasty hack here: we want to return a static string
444 * which the caller will never have to worry about freeing, but on
445 * the other hand if we call FormatMessage to get it then it will
446 * want to either allocate a buffer or write into one we own.
448 * So what we do is to maintain a tree234 of error strings we've
449 * already used. New ones are allocated from the heap, but then
450 * put in this tree and kept forever.
454 errstrings = newtree234(errstring_compare);
456 es = find234(errstrings, &error, errstring_find);
459 int bufsize, bufused;
461 es = snew(struct errstring);
463 /* maximum size for FormatMessage is 64K */
464 bufsize = 65535 + sizeof(prefix);
465 es->text = snewn(bufsize, char);
466 strcpy(es->text, prefix);
467 bufused = strlen(es->text);
468 if (!FormatMessage((FORMAT_MESSAGE_FROM_SYSTEM |
469 FORMAT_MESSAGE_IGNORE_INSERTS), NULL, error,
470 MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
471 es->text + bufused, bufsize - bufused, NULL)) {
472 sprintf(es->text + bufused,
473 "Windows error code %d (and FormatMessage returned %d)",
474 error, GetLastError());
476 int len = strlen(es->text);
477 if (len > 0 && es->text[len-1] == '\n')
478 es->text[len-1] = '\0';
480 es->text = sresize(es->text, strlen(es->text) + 1, char);
481 add234(errstrings, es);
487 SockAddr sk_namelookup(const char *host, char **canonicalname,
490 SockAddr ret = snew(struct SockAddr_tag);
495 /* Default to IPv4. */
496 hint_family = (address_family == ADDRTYPE_IPV4 ? AF_INET :
498 address_family == ADDRTYPE_IPV6 ? AF_INET6 :
502 /* Clear the structure and default to IPv4. */
503 memset(ret, 0, sizeof(struct SockAddr_tag));
507 ret->addresses = NULL;
508 ret->resolved = FALSE;
512 if ((a = p_inet_addr(host)) == (unsigned long) INADDR_NONE) {
513 struct hostent *h = NULL;
517 * Use getaddrinfo when it's available
520 struct addrinfo hints;
521 #ifdef NET_SETUP_DIAGNOSTICS
522 logevent(NULL, "Using getaddrinfo() for resolving");
524 memset(&hints, 0, sizeof(hints));
525 hints.ai_family = hint_family;
526 hints.ai_flags = AI_CANONNAME;
527 if ((err = p_getaddrinfo(host, NULL, &hints, &ret->ais)) == 0)
528 ret->resolved = TRUE;
532 #ifdef NET_SETUP_DIAGNOSTICS
533 logevent(NULL, "Using gethostbyname() for resolving");
536 * Otherwise use the IPv4-only gethostbyname...
537 * (NOTE: we don't use gethostbyname as a fallback!)
539 if ( (h = p_gethostbyname(host)) )
540 ret->resolved = TRUE;
542 err = p_WSAGetLastError();
545 if (!ret->resolved) {
546 ret->error = (err == WSAENETDOWN ? "Network is down" :
547 err == WSAHOST_NOT_FOUND ? "Host does not exist" :
548 err == WSATRY_AGAIN ? "Host not found" :
550 p_getaddrinfo&&p_gai_strerror ? p_gai_strerror(err) :
552 "gethostbyname: unknown error");
557 /* If we got an address info use that... */
559 /* Are we in IPv4 fallback mode? */
560 /* We put the IPv4 address into the a variable so we can further-on use the IPv4 code... */
561 if (ret->ais->ai_family == AF_INET)
563 (char *) &((SOCKADDR_IN *) ret->ais->
564 ai_addr)->sin_addr, sizeof(a));
566 if (ret->ais->ai_canonname)
567 strncpy(realhost, ret->ais->ai_canonname, lenof(realhost));
569 strncpy(realhost, host, lenof(realhost));
571 /* We used the IPv4-only gethostbyname()... */
576 for (n = 0; h->h_addr_list[n]; n++);
577 ret->addresses = snewn(n, unsigned long);
579 for (n = 0; n < ret->naddresses; n++) {
580 memcpy(&a, h->h_addr_list[n], sizeof(a));
581 ret->addresses[n] = p_ntohl(a);
583 memcpy(&a, h->h_addr, sizeof(a));
584 /* This way we are always sure the h->h_name is valid :) */
585 strncpy(realhost, h->h_name, sizeof(realhost));
590 * This must be a numeric IPv4 address because it caused a
591 * success return from inet_addr.
593 ret->addresses = snewn(1, unsigned long);
595 ret->addresses[0] = p_ntohl(a);
596 ret->resolved = TRUE;
597 strncpy(realhost, host, sizeof(realhost));
599 realhost[lenof(realhost)-1] = '\0';
600 *canonicalname = snewn(1+strlen(realhost), char);
601 strcpy(*canonicalname, realhost);
605 SockAddr sk_nonamelookup(const char *host)
607 SockAddr ret = snew(struct SockAddr_tag);
609 ret->resolved = FALSE;
613 ret->addresses = NULL;
616 strncpy(ret->hostname, host, lenof(ret->hostname));
617 ret->hostname[lenof(ret->hostname)-1] = '\0';
621 int sk_nextaddr(SockAddr addr, SockAddrStep *step)
625 if (step->ai->ai_next) {
626 step->ai = step->ai->ai_next;
632 if (step->curraddr+1 < addr->naddresses) {
640 void sk_getaddr(SockAddr addr, char *buf, int buflen)
643 START_STEP(addr, step);
648 if (p_WSAAddressToStringA) {
649 DWORD dwbuflen = buflen;
650 err = p_WSAAddressToStringA(step.ai->ai_addr, step.ai->ai_addrlen,
651 NULL, buf, &dwbuflen);
655 strncpy(buf, addr->hostname, buflen);
657 strncpy(buf, "<unknown>", buflen);
658 buf[buflen-1] = '\0';
662 if (SOCKADDR_FAMILY(addr, step) == AF_INET) {
664 assert(addr->addresses && step.curraddr < addr->naddresses);
665 a.s_addr = p_htonl(addr->addresses[step.curraddr]);
666 strncpy(buf, p_inet_ntoa(a), buflen);
667 buf[buflen-1] = '\0';
669 strncpy(buf, addr->hostname, buflen);
670 buf[buflen-1] = '\0';
674 int sk_hostname_is_local(const char *name)
676 return !strcmp(name, "localhost") ||
677 !strcmp(name, "::1") ||
678 !strncmp(name, "127.", 4);
681 static INTERFACE_INFO local_interfaces[16];
682 static int n_local_interfaces; /* 0=not yet, -1=failed, >0=number */
684 static int ipv4_is_local_addr(struct in_addr addr)
686 if (ipv4_is_loopback(addr))
687 return 1; /* loopback addresses are local */
688 if (!n_local_interfaces) {
689 SOCKET s = p_socket(AF_INET, SOCK_DGRAM, 0);
693 p_WSAIoctl(s, SIO_GET_INTERFACE_LIST, NULL, 0,
694 local_interfaces, sizeof(local_interfaces),
695 &retbytes, NULL, NULL) == 0)
696 n_local_interfaces = retbytes / sizeof(INTERFACE_INFO);
698 logevent(NULL, "Unable to get list of local IP addresses");
700 if (n_local_interfaces > 0) {
702 for (i = 0; i < n_local_interfaces; i++) {
703 SOCKADDR_IN *address =
704 (SOCKADDR_IN *)&local_interfaces[i].iiAddress;
705 if (address->sin_addr.s_addr == addr.s_addr)
706 return 1; /* this address is local */
709 return 0; /* this address is not local */
712 int sk_address_is_local(SockAddr addr)
716 START_STEP(addr, step);
717 family = SOCKADDR_FAMILY(addr, step);
720 if (family == AF_INET6) {
721 return IN6_IS_ADDR_LOOPBACK(&((const struct sockaddr_in6 *)step.ai->ai_addr)->sin6_addr);
724 if (family == AF_INET) {
727 return ipv4_is_local_addr(((struct sockaddr_in *)step.ai->ai_addr)
733 assert(addr->addresses && step.curraddr < addr->naddresses);
734 a.s_addr = p_htonl(addr->addresses[step.curraddr]);
735 return ipv4_is_local_addr(a);
738 assert(family == AF_UNSPEC);
739 return 0; /* we don't know; assume not */
743 int sk_address_is_special_local(SockAddr addr)
745 return 0; /* no Unix-domain socket analogue here */
748 int sk_addrtype(SockAddr addr)
752 START_STEP(addr, step);
753 family = SOCKADDR_FAMILY(addr, step);
755 return (family == AF_INET ? ADDRTYPE_IPV4 :
757 family == AF_INET6 ? ADDRTYPE_IPV6 :
762 void sk_addrcopy(SockAddr addr, char *buf)
766 START_STEP(addr, step);
767 family = SOCKADDR_FAMILY(addr, step);
769 assert(family != AF_UNSPEC);
772 if (family == AF_INET)
773 memcpy(buf, &((struct sockaddr_in *)step.ai->ai_addr)->sin_addr,
774 sizeof(struct in_addr));
775 else if (family == AF_INET6)
776 memcpy(buf, &((struct sockaddr_in6 *)step.ai->ai_addr)->sin6_addr,
777 sizeof(struct in6_addr));
782 if (family == AF_INET) {
784 assert(addr->addresses && step.curraddr < addr->naddresses);
785 a.s_addr = p_htonl(addr->addresses[step.curraddr]);
786 memcpy(buf, (char*) &a.s_addr, 4);
790 void sk_addr_free(SockAddr addr)
792 if (--addr->refcount > 0)
795 if (addr->ais && p_freeaddrinfo)
796 p_freeaddrinfo(addr->ais);
799 sfree(addr->addresses);
803 SockAddr sk_addr_dup(SockAddr addr)
809 static Plug sk_tcp_plug(Socket sock, Plug p)
811 Actual_Socket s = (Actual_Socket) sock;
818 static void sk_tcp_flush(Socket s)
821 * We send data to the socket as soon as we can anyway,
822 * so we don't need to do anything here. :-)
826 static void sk_tcp_close(Socket s);
827 static int sk_tcp_write(Socket s, const char *data, int len);
828 static int sk_tcp_write_oob(Socket s, const char *data, int len);
829 static void sk_tcp_write_eof(Socket s);
830 static void sk_tcp_set_frozen(Socket s, int is_frozen);
831 static const char *sk_tcp_socket_error(Socket s);
833 extern char *do_select(SOCKET skt, int startup);
835 static Socket sk_tcp_accept(accept_ctx_t ctx, Plug plug)
837 static const struct socket_function_table fn_table = {
853 * Create Socket structure.
855 ret = snew(struct Socket_tag);
859 bufchain_init(&ret->output_data);
860 ret->writable = 1; /* to start with */
861 ret->sending_oob = 0;
862 ret->outgoingeof = EOF_NO;
864 ret->frozen_readable = 0;
865 ret->localhost_only = 0; /* unused, but best init anyway */
866 ret->pending_error = 0;
867 ret->parent = ret->child = NULL;
870 ret->s = (SOCKET)ctx.p;
872 if (ret->s == INVALID_SOCKET) {
873 err = p_WSAGetLastError();
874 ret->error = winsock_error_string(err);
880 /* Set up a select mechanism. This could be an AsyncSelect on a
881 * window, or an EventSelect on an event object. */
882 errstr = do_select(ret->s, 1);
893 static DWORD try_connect(Actual_Socket sock)
905 if (sock->s != INVALID_SOCKET) {
906 do_select(sock->s, 0);
907 p_closesocket(sock->s);
910 plug_log(sock->plug, 0, sock->addr, sock->port, NULL, 0);
915 family = SOCKADDR_FAMILY(sock->addr, sock->step);
918 * Remove the socket from the tree before we overwrite its
919 * internal socket id, because that forms part of the tree's
920 * sorting criterion. We'll add it back before exiting this
921 * function, whether we changed anything or not.
923 del234(sktree, sock);
925 s = p_socket(family, SOCK_STREAM, 0);
928 if (s == INVALID_SOCKET) {
929 err = p_WSAGetLastError();
930 sock->error = winsock_error_string(err);
934 if (sock->oobinline) {
936 p_setsockopt(s, SOL_SOCKET, SO_OOBINLINE, (void *) &b, sizeof(b));
941 p_setsockopt(s, IPPROTO_TCP, TCP_NODELAY, (void *) &b, sizeof(b));
944 if (sock->keepalive) {
946 p_setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, (void *) &b, sizeof(b));
950 * Bind to local address.
953 localport = 1023; /* count from 1023 downwards */
955 localport = 0; /* just use port 0 (ie winsock picks) */
957 /* Loop round trying to bind */
962 if (family == AF_INET6) {
963 memset(&a6, 0, sizeof(a6));
964 a6.sin6_family = AF_INET6;
965 /*a6.sin6_addr = in6addr_any; */ /* == 0 done by memset() */
966 a6.sin6_port = p_htons(localport);
970 a.sin_family = AF_INET;
971 a.sin_addr.s_addr = p_htonl(INADDR_ANY);
972 a.sin_port = p_htons(localport);
975 sockcode = p_bind(s, (family == AF_INET6 ?
976 (struct sockaddr *) &a6 :
977 (struct sockaddr *) &a),
978 (family == AF_INET6 ? sizeof(a6) : sizeof(a)));
980 sockcode = p_bind(s, (struct sockaddr *) &a, sizeof(a));
982 if (sockcode != SOCKET_ERROR) {
986 err = p_WSAGetLastError();
987 if (err != WSAEADDRINUSE) /* failed, for a bad reason */
992 break; /* we're only looping once */
995 break; /* we might have got to the end */
999 sock->error = winsock_error_string(err);
1004 * Connect to remote address.
1007 if (sock->step.ai) {
1008 if (family == AF_INET6) {
1009 a6.sin6_family = AF_INET6;
1010 a6.sin6_port = p_htons((short) sock->port);
1012 ((struct sockaddr_in6 *) sock->step.ai->ai_addr)->sin6_addr;
1013 a6.sin6_flowinfo = ((struct sockaddr_in6 *) sock->step.ai->ai_addr)->sin6_flowinfo;
1014 a6.sin6_scope_id = ((struct sockaddr_in6 *) sock->step.ai->ai_addr)->sin6_scope_id;
1016 a.sin_family = AF_INET;
1018 ((struct sockaddr_in *) sock->step.ai->ai_addr)->sin_addr;
1019 a.sin_port = p_htons((short) sock->port);
1024 assert(sock->addr->addresses && sock->step.curraddr < sock->addr->naddresses);
1025 a.sin_family = AF_INET;
1026 a.sin_addr.s_addr = p_htonl(sock->addr->addresses[sock->step.curraddr]);
1027 a.sin_port = p_htons((short) sock->port);
1030 /* Set up a select mechanism. This could be an AsyncSelect on a
1031 * window, or an EventSelect on an event object. */
1032 errstr = do_select(s, 1);
1034 sock->error = errstr;
1042 ((family == AF_INET6) ? (struct sockaddr *) &a6 :
1043 (struct sockaddr *) &a),
1044 (family == AF_INET6) ? sizeof(a6) : sizeof(a))
1046 p_connect(s, (struct sockaddr *) &a, sizeof(a))
1048 ) == SOCKET_ERROR) {
1049 err = p_WSAGetLastError();
1051 * We expect a potential EWOULDBLOCK here, because the
1052 * chances are the front end has done a select for
1053 * FD_CONNECT, so that connect() will complete
1056 if ( err != WSAEWOULDBLOCK ) {
1057 sock->error = winsock_error_string(err);
1062 * If we _don't_ get EWOULDBLOCK, the connect has completed
1063 * and we should set the socket as writable.
1073 * No matter what happened, put the socket back in the tree.
1075 add234(sktree, sock);
1078 plug_log(sock->plug, 1, sock->addr, sock->port, sock->error, err);
1082 Socket sk_new(SockAddr addr, int port, int privport, int oobinline,
1083 int nodelay, int keepalive, Plug plug)
1085 static const struct socket_function_table fn_table = {
1100 * Create Socket structure.
1102 ret = snew(struct Socket_tag);
1103 ret->fn = &fn_table;
1106 bufchain_init(&ret->output_data);
1107 ret->connected = 0; /* to start with */
1108 ret->writable = 0; /* to start with */
1109 ret->sending_oob = 0;
1110 ret->outgoingeof = EOF_NO;
1112 ret->frozen_readable = 0;
1113 ret->localhost_only = 0; /* unused, but best init anyway */
1114 ret->pending_error = 0;
1115 ret->parent = ret->child = NULL;
1116 ret->oobinline = oobinline;
1117 ret->nodelay = nodelay;
1118 ret->keepalive = keepalive;
1119 ret->privport = privport;
1122 START_STEP(ret->addr, ret->step);
1123 ret->s = INVALID_SOCKET;
1127 err = try_connect(ret);
1128 } while (err && sk_nextaddr(ret->addr, &ret->step));
1130 return (Socket) ret;
1133 Socket sk_newlistener(char *srcaddr, int port, Plug plug, int local_host_only,
1134 int orig_address_family)
1136 static const struct socket_function_table fn_table = {
1162 * Create Socket structure.
1164 ret = snew(struct Socket_tag);
1165 ret->fn = &fn_table;
1168 bufchain_init(&ret->output_data);
1169 ret->writable = 0; /* to start with */
1170 ret->sending_oob = 0;
1171 ret->outgoingeof = EOF_NO;
1173 ret->frozen_readable = 0;
1174 ret->localhost_only = local_host_only;
1175 ret->pending_error = 0;
1176 ret->parent = ret->child = NULL;
1180 * Translate address_family from platform-independent constants
1181 * into local reality.
1183 address_family = (orig_address_family == ADDRTYPE_IPV4 ? AF_INET :
1185 orig_address_family == ADDRTYPE_IPV6 ? AF_INET6 :
1190 * Our default, if passed the `don't care' value
1191 * ADDRTYPE_UNSPEC, is to listen on IPv4. If IPv6 is supported,
1192 * we will also set up a second socket listening on IPv6, but
1193 * the v4 one is primary since that ought to work even on
1194 * non-v6-supporting systems.
1196 if (address_family == AF_UNSPEC) address_family = AF_INET;
1201 s = p_socket(address_family, SOCK_STREAM, 0);
1204 if (s == INVALID_SOCKET) {
1205 err = p_WSAGetLastError();
1206 ret->error = winsock_error_string(err);
1207 return (Socket) ret;
1212 p_setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (const char *)&on, sizeof(on));
1215 if (address_family == AF_INET6) {
1216 memset(&a6, 0, sizeof(a6));
1217 a6.sin6_family = AF_INET6;
1218 /* FIXME: srcaddr is ignored for IPv6, because I (SGT) don't
1219 * know how to do it. :-)
1220 * (jeroen:) saddr is specified as an address.. eg 2001:db8::1
1221 * Thus we need either a parser that understands [2001:db8::1]:80
1222 * style addresses and/or enhance this to understand hostnames too. */
1223 if (local_host_only)
1224 a6.sin6_addr = in6addr_loopback;
1226 a6.sin6_addr = in6addr_any;
1227 a6.sin6_port = p_htons(port);
1232 a.sin_family = AF_INET;
1235 * Bind to source address. First try an explicitly
1239 a.sin_addr.s_addr = p_inet_addr(srcaddr);
1240 if (a.sin_addr.s_addr != INADDR_NONE) {
1241 /* Override localhost_only with specified listen addr. */
1242 ret->localhost_only = ipv4_is_loopback(a.sin_addr);
1248 * ... and failing that, go with one of the standard ones.
1251 if (local_host_only)
1252 a.sin_addr.s_addr = p_htonl(INADDR_LOOPBACK);
1254 a.sin_addr.s_addr = p_htonl(INADDR_ANY);
1257 a.sin_port = p_htons((short)port);
1260 retcode = p_bind(s, (address_family == AF_INET6 ?
1261 (struct sockaddr *) &a6 :
1262 (struct sockaddr *) &a),
1264 AF_INET6 ? sizeof(a6) : sizeof(a)));
1266 retcode = p_bind(s, (struct sockaddr *) &a, sizeof(a));
1268 if (retcode != SOCKET_ERROR) {
1271 err = p_WSAGetLastError();
1276 ret->error = winsock_error_string(err);
1277 return (Socket) ret;
1281 if (p_listen(s, SOMAXCONN) == SOCKET_ERROR) {
1283 ret->error = winsock_error_string(p_WSAGetLastError());
1284 return (Socket) ret;
1287 /* Set up a select mechanism. This could be an AsyncSelect on a
1288 * window, or an EventSelect on an event object. */
1289 errstr = do_select(s, 1);
1292 ret->error = errstr;
1293 return (Socket) ret;
1296 add234(sktree, ret);
1300 * If we were given ADDRTYPE_UNSPEC, we must also create an
1301 * IPv6 listening socket and link it to this one.
1303 if (address_family == AF_INET && orig_address_family == ADDRTYPE_UNSPEC) {
1304 Actual_Socket other;
1306 other = (Actual_Socket) sk_newlistener(srcaddr, port, plug,
1307 local_host_only, ADDRTYPE_IPV6);
1310 if (!other->error) {
1311 other->parent = ret;
1320 return (Socket) ret;
1323 static void sk_tcp_close(Socket sock)
1325 extern char *do_select(SOCKET skt, int startup);
1326 Actual_Socket s = (Actual_Socket) sock;
1329 sk_tcp_close((Socket)s->child);
1333 p_closesocket(s->s);
1335 sk_addr_free(s->addr);
1340 * Deal with socket errors detected in try_send().
1342 static void socket_error_callback(void *vs)
1344 Actual_Socket s = (Actual_Socket)vs;
1347 * Just in case other socket work has caused this socket to vanish
1348 * or become somehow non-erroneous before this callback arrived...
1350 if (!find234(sktree, s, NULL) || !s->pending_error)
1354 * An error has occurred on this socket. Pass it to the plug.
1356 plug_closing(s->plug, winsock_error_string(s->pending_error),
1357 s->pending_error, 0);
1361 * The function which tries to send on a socket once it's deemed
1364 void try_send(Actual_Socket s)
1366 while (s->sending_oob || bufchain_size(&s->output_data) > 0) {
1370 int len, urgentflag;
1372 if (s->sending_oob) {
1373 urgentflag = MSG_OOB;
1374 len = s->sending_oob;
1378 bufchain_prefix(&s->output_data, &data, &len);
1380 nsent = p_send(s->s, data, len, urgentflag);
1381 noise_ultralight(nsent);
1383 err = (nsent < 0 ? p_WSAGetLastError() : 0);
1384 if ((err < WSABASEERR && nsent < 0) || err == WSAEWOULDBLOCK) {
1386 * Perfectly normal: we've sent all we can for the moment.
1388 * (Some WinSock send() implementations can return
1389 * <0 but leave no sensible error indication -
1390 * WSAGetLastError() is called but returns zero or
1391 * a small number - so we check that case and treat
1392 * it just like WSAEWOULDBLOCK.)
1394 s->writable = FALSE;
1396 } else if (nsent == 0 ||
1397 err == WSAECONNABORTED || err == WSAECONNRESET) {
1399 * If send() returns CONNABORTED or CONNRESET, we
1400 * unfortunately can't just call plug_closing(),
1401 * because it's quite likely that we're currently
1402 * _in_ a call from the code we'd be calling back
1403 * to, so we'd have to make half the SSH code
1404 * reentrant. Instead we flag a pending error on
1405 * the socket, to be dealt with (by calling
1406 * plug_closing()) at some suitable future moment.
1408 s->pending_error = err;
1409 queue_toplevel_callback(socket_error_callback, s);
1412 /* We're inside the Windows frontend here, so we know
1413 * that the frontend handle is unnecessary. */
1414 logevent(NULL, winsock_error_string(err));
1415 fatalbox("%s", winsock_error_string(err));
1418 if (s->sending_oob) {
1420 memmove(s->oobdata, s->oobdata+nsent, len-nsent);
1421 s->sending_oob = len - nsent;
1426 bufchain_consume(&s->output_data, nsent);
1432 * If we reach here, we've finished sending everything we might
1433 * have needed to send. Send EOF, if we need to.
1435 if (s->outgoingeof == EOF_PENDING) {
1436 p_shutdown(s->s, SD_SEND);
1437 s->outgoingeof = EOF_SENT;
1441 static int sk_tcp_write(Socket sock, const char *buf, int len)
1443 Actual_Socket s = (Actual_Socket) sock;
1445 assert(s->outgoingeof == EOF_NO);
1448 * Add the data to the buffer list on the socket.
1450 bufchain_add(&s->output_data, buf, len);
1453 * Now try sending from the start of the buffer list.
1458 return bufchain_size(&s->output_data);
1461 static int sk_tcp_write_oob(Socket sock, const char *buf, int len)
1463 Actual_Socket s = (Actual_Socket) sock;
1465 assert(s->outgoingeof == EOF_NO);
1468 * Replace the buffer list on the socket with the data.
1470 bufchain_clear(&s->output_data);
1471 assert(len <= sizeof(s->oobdata));
1472 memcpy(s->oobdata, buf, len);
1473 s->sending_oob = len;
1476 * Now try sending from the start of the buffer list.
1481 return s->sending_oob;
1484 static void sk_tcp_write_eof(Socket sock)
1486 Actual_Socket s = (Actual_Socket) sock;
1488 assert(s->outgoingeof == EOF_NO);
1491 * Mark the socket as pending outgoing EOF.
1493 s->outgoingeof = EOF_PENDING;
1496 * Now try sending from the start of the buffer list.
1502 int select_result(WPARAM wParam, LPARAM lParam)
1506 char buf[20480]; /* nice big buffer for plenty of speed */
1510 /* wParam is the socket itself */
1513 return 1; /* boggle */
1515 s = find234(sktree, (void *) wParam, cmpforsearch);
1517 return 1; /* boggle */
1519 if ((err = WSAGETSELECTERROR(lParam)) != 0) {
1521 * An error has occurred on this socket. Pass it to the
1525 plug_log(s->plug, 1, s->addr, s->port,
1526 winsock_error_string(err), err);
1527 while (s->addr && sk_nextaddr(s->addr, &s->step)) {
1528 err = try_connect(s);
1532 return plug_closing(s->plug, winsock_error_string(err), err, 0);
1537 noise_ultralight(lParam);
1539 switch (WSAGETSELECTEVENT(lParam)) {
1541 s->connected = s->writable = 1;
1543 * Once a socket is connected, we can stop falling
1544 * back through the candidate addresses to connect
1548 sk_addr_free(s->addr);
1553 /* In the case the socket is still frozen, we don't even bother */
1555 s->frozen_readable = 1;
1560 * We have received data on the socket. For an oobinline
1561 * socket, this might be data _before_ an urgent pointer,
1562 * in which case we send it to the back end with type==1
1563 * (data prior to urgent).
1567 p_ioctlsocket(s->s, SIOCATMARK, &atmark);
1569 * Avoid checking the return value from ioctlsocket(),
1570 * on the grounds that some WinSock wrappers don't
1571 * support it. If it does nothing, we get atmark==1,
1572 * which is equivalent to `no OOB pending', so the
1573 * effect will be to non-OOB-ify any OOB data.
1578 ret = p_recv(s->s, buf, sizeof(buf), 0);
1579 noise_ultralight(ret);
1581 err = p_WSAGetLastError();
1582 if (err == WSAEWOULDBLOCK) {
1587 return plug_closing(s->plug, winsock_error_string(err), err,
1589 } else if (0 == ret) {
1590 return plug_closing(s->plug, NULL, 0, 0);
1592 return plug_receive(s->plug, atmark ? 0 : 1, buf, ret);
1597 * This will only happen on a non-oobinline socket. It
1598 * indicates that we can immediately perform an OOB read
1599 * and get back OOB data, which we will send to the back
1600 * end with type==2 (urgent data).
1602 ret = p_recv(s->s, buf, sizeof(buf), MSG_OOB);
1603 noise_ultralight(ret);
1605 char *str = (ret == 0 ? "Internal networking trouble" :
1606 winsock_error_string(p_WSAGetLastError()));
1607 /* We're inside the Windows frontend here, so we know
1608 * that the frontend handle is unnecessary. */
1609 logevent(NULL, str);
1610 fatalbox("%s", str);
1612 return plug_receive(s->plug, 2, buf, ret);
1617 int bufsize_before, bufsize_after;
1619 bufsize_before = s->sending_oob + bufchain_size(&s->output_data);
1621 bufsize_after = s->sending_oob + bufchain_size(&s->output_data);
1622 if (bufsize_after < bufsize_before)
1623 plug_sent(s->plug, bufsize_after);
1627 /* Signal a close on the socket. First read any outstanding data. */
1630 ret = p_recv(s->s, buf, sizeof(buf), 0);
1632 err = p_WSAGetLastError();
1633 if (err == WSAEWOULDBLOCK)
1635 return plug_closing(s->plug, winsock_error_string(err),
1639 open &= plug_receive(s->plug, 0, buf, ret);
1641 open &= plug_closing(s->plug, NULL, 0, 0);
1648 struct sockaddr_in isa;
1650 struct sockaddr_storage isa;
1652 int addrlen = sizeof(isa);
1653 SOCKET t; /* socket of connection */
1656 memset(&isa, 0, sizeof(isa));
1658 t = p_accept(s->s,(struct sockaddr *)&isa,&addrlen);
1659 if (t == INVALID_SOCKET)
1661 err = p_WSAGetLastError();
1662 if (err == WSATRY_AGAIN)
1669 if (isa.ss_family == AF_INET &&
1670 s->localhost_only &&
1671 !ipv4_is_local_addr(((struct sockaddr_in *)&isa)->sin_addr))
1673 if (s->localhost_only && !ipv4_is_local_addr(isa.sin_addr))
1676 p_closesocket(t); /* dodgy WinSock let nonlocal through */
1677 } else if (plug_accepting(s->plug, sk_tcp_accept, actx)) {
1678 p_closesocket(t); /* denied or error */
1687 * Special error values are returned from sk_namelookup and sk_new
1688 * if there's a problem. These functions extract an error message,
1689 * or return NULL if there's no problem.
1691 const char *sk_addr_error(SockAddr addr)
1695 static const char *sk_tcp_socket_error(Socket sock)
1697 Actual_Socket s = (Actual_Socket) sock;
1701 static void sk_tcp_set_frozen(Socket sock, int is_frozen)
1703 Actual_Socket s = (Actual_Socket) sock;
1704 if (s->frozen == is_frozen)
1706 s->frozen = is_frozen;
1709 if (s->frozen_readable) {
1711 p_recv(s->s, &c, 1, MSG_PEEK);
1714 s->frozen_readable = 0;
1717 void socket_reselect_all(void)
1722 for (i = 0; (s = index234(sktree, i)) != NULL; i++) {
1729 * For Plink: enumerate all sockets currently active.
1731 SOCKET first_socket(int *state)
1735 s = index234(sktree, (*state)++);
1736 return s ? s->s : INVALID_SOCKET;
1739 SOCKET next_socket(int *state)
1741 Actual_Socket s = index234(sktree, (*state)++);
1742 return s ? s->s : INVALID_SOCKET;
1745 extern int socket_writable(SOCKET skt)
1747 Actual_Socket s = find234(sktree, (void *)skt, cmpforsearch);
1750 return bufchain_size(&s->output_data) > 0;
1755 int net_service_lookup(char *service)
1758 se = p_getservbyname(service, NULL);
1760 return p_ntohs(se->s_port);
1765 char *get_hostname(void)
1768 char *hostname = NULL;
1771 hostname = sresize(hostname, len, char);
1772 if (p_gethostname(hostname, len) < 0) {
1777 } while (strlen(hostname) >= (size_t)(len-1));
1781 SockAddr platform_get_x11_unix_address(const char *display, int displaynum,
1782 char **canonicalname)
1784 SockAddr ret = snew(struct SockAddr_tag);
1785 memset(ret, 0, sizeof(struct SockAddr_tag));
1786 ret->error = "unix sockets not supported on this platform";