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 */
60 int frozen; /* this causes readability notifications to be ignored */
61 int frozen_readable; /* this means we missed at least one readability
62 * notification while we were frozen */
63 int localhost_only; /* for listening sockets */
66 int oobinline, nodelay, keepalive, privport;
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;
148 #define DECL_WINSOCK_FUNCTION(linkage, rettype, name, params) \
149 typedef rettype (WINAPI *t_##name) params; \
150 linkage t_##name p_##name
151 #define GET_WINSOCK_FUNCTION(module, name) \
152 p_##name = module ? (t_##name) GetProcAddress(module, #name) : NULL
154 DECL_WINSOCK_FUNCTION(NOTHING, int, WSAAsyncSelect,
155 (SOCKET, HWND, u_int, long));
156 DECL_WINSOCK_FUNCTION(NOTHING, int, WSAEventSelect, (SOCKET, WSAEVENT, long));
157 DECL_WINSOCK_FUNCTION(NOTHING, int, select,
158 (int, fd_set FAR *, fd_set FAR *,
159 fd_set FAR *, const struct timeval FAR *));
160 DECL_WINSOCK_FUNCTION(NOTHING, int, WSAGetLastError, (void));
161 DECL_WINSOCK_FUNCTION(NOTHING, int, WSAEnumNetworkEvents,
162 (SOCKET, WSAEVENT, LPWSANETWORKEVENTS));
163 DECL_WINSOCK_FUNCTION(static, int, WSAStartup, (WORD, LPWSADATA));
164 DECL_WINSOCK_FUNCTION(static, int, WSACleanup, (void));
165 DECL_WINSOCK_FUNCTION(static, int, closesocket, (SOCKET));
166 DECL_WINSOCK_FUNCTION(static, u_long, ntohl, (u_long));
167 DECL_WINSOCK_FUNCTION(static, u_long, htonl, (u_long));
168 DECL_WINSOCK_FUNCTION(static, u_short, htons, (u_short));
169 DECL_WINSOCK_FUNCTION(static, u_short, ntohs, (u_short));
170 DECL_WINSOCK_FUNCTION(static, int, gethostname, (char *, int));
171 DECL_WINSOCK_FUNCTION(static, struct hostent FAR *, gethostbyname,
173 DECL_WINSOCK_FUNCTION(static, struct servent FAR *, getservbyname,
174 (const char FAR *, const char FAR *));
175 DECL_WINSOCK_FUNCTION(static, unsigned long, inet_addr, (const char FAR *));
176 DECL_WINSOCK_FUNCTION(static, char FAR *, inet_ntoa, (struct in_addr));
177 DECL_WINSOCK_FUNCTION(static, int, connect,
178 (SOCKET, const struct sockaddr FAR *, int));
179 DECL_WINSOCK_FUNCTION(static, int, bind,
180 (SOCKET, const struct sockaddr FAR *, int));
181 DECL_WINSOCK_FUNCTION(static, int, setsockopt,
182 (SOCKET, int, int, const char FAR *, int));
183 DECL_WINSOCK_FUNCTION(static, SOCKET, socket, (int, int, int));
184 DECL_WINSOCK_FUNCTION(static, int, listen, (SOCKET, int));
185 DECL_WINSOCK_FUNCTION(static, int, send, (SOCKET, const char FAR *, int, int));
186 DECL_WINSOCK_FUNCTION(static, int, ioctlsocket,
187 (SOCKET, long, u_long FAR *));
188 DECL_WINSOCK_FUNCTION(static, SOCKET, accept,
189 (SOCKET, struct sockaddr FAR *, int FAR *));
190 DECL_WINSOCK_FUNCTION(static, int, recv, (SOCKET, char FAR *, int, int));
191 DECL_WINSOCK_FUNCTION(static, int, WSAIoctl,
192 (SOCKET, DWORD, LPVOID, DWORD, LPVOID, DWORD,
193 LPDWORD, LPWSAOVERLAPPED,
194 LPWSAOVERLAPPED_COMPLETION_ROUTINE));
196 DECL_WINSOCK_FUNCTION(static, int, getaddrinfo,
197 (const char *nodename, const char *servname,
198 const struct addrinfo *hints, struct addrinfo **res));
199 DECL_WINSOCK_FUNCTION(static, void, freeaddrinfo, (struct addrinfo *res));
200 DECL_WINSOCK_FUNCTION(static, int, getnameinfo,
201 (const struct sockaddr FAR * sa, socklen_t salen,
202 char FAR * host, size_t hostlen, char FAR * serv,
203 size_t servlen, int flags));
204 DECL_WINSOCK_FUNCTION(static, char *, gai_strerror, (int ecode));
205 DECL_WINSOCK_FUNCTION(static, int, WSAAddressToStringA,
206 (LPSOCKADDR, DWORD, LPWSAPROTOCOL_INFO,
210 static HMODULE winsock_module = NULL;
211 static WSADATA wsadata;
213 static HMODULE winsock2_module = NULL;
214 static HMODULE wship6_module = NULL;
217 int sk_startup(int hi, int lo)
221 winsock_ver = MAKEWORD(hi, lo);
223 if (p_WSAStartup(winsock_ver, &wsadata)) {
227 if (LOBYTE(wsadata.wVersion) != LOBYTE(winsock_ver)) {
231 #ifdef NET_SETUP_DIAGNOSTICS
234 sprintf(buf, "Using WinSock %d.%d", hi, lo);
246 winsock_module = LoadLibrary("WS2_32.DLL");
247 if (!winsock_module) {
248 winsock_module = LoadLibrary("WSOCK32.DLL");
251 fatalbox("Unable to load any WinSock library");
254 /* Check if we have getaddrinfo in Winsock */
255 if (GetProcAddress(winsock_module, "getaddrinfo") != NULL) {
256 #ifdef NET_SETUP_DIAGNOSTICS
257 logevent(NULL, "Native WinSock IPv6 support detected");
259 GET_WINSOCK_FUNCTION(winsock_module, getaddrinfo);
260 GET_WINSOCK_FUNCTION(winsock_module, freeaddrinfo);
261 GET_WINSOCK_FUNCTION(winsock_module, getnameinfo);
262 GET_WINSOCK_FUNCTION(winsock_module, gai_strerror);
264 /* Fall back to wship6.dll for Windows 2000 */
265 wship6_module = LoadLibrary("wship6.dll");
267 #ifdef NET_SETUP_DIAGNOSTICS
268 logevent(NULL, "WSH IPv6 support detected");
270 GET_WINSOCK_FUNCTION(wship6_module, getaddrinfo);
271 GET_WINSOCK_FUNCTION(wship6_module, freeaddrinfo);
272 GET_WINSOCK_FUNCTION(wship6_module, getnameinfo);
273 GET_WINSOCK_FUNCTION(wship6_module, gai_strerror);
275 #ifdef NET_SETUP_DIAGNOSTICS
276 logevent(NULL, "No IPv6 support detected");
280 GET_WINSOCK_FUNCTION(winsock2_module, WSAAddressToStringA);
282 #ifdef NET_SETUP_DIAGNOSTICS
283 logevent(NULL, "PuTTY was built without IPv6 support");
287 GET_WINSOCK_FUNCTION(winsock_module, WSAAsyncSelect);
288 GET_WINSOCK_FUNCTION(winsock_module, WSAEventSelect);
289 GET_WINSOCK_FUNCTION(winsock_module, select);
290 GET_WINSOCK_FUNCTION(winsock_module, WSAGetLastError);
291 GET_WINSOCK_FUNCTION(winsock_module, WSAEnumNetworkEvents);
292 GET_WINSOCK_FUNCTION(winsock_module, WSAStartup);
293 GET_WINSOCK_FUNCTION(winsock_module, WSACleanup);
294 GET_WINSOCK_FUNCTION(winsock_module, closesocket);
295 GET_WINSOCK_FUNCTION(winsock_module, ntohl);
296 GET_WINSOCK_FUNCTION(winsock_module, htonl);
297 GET_WINSOCK_FUNCTION(winsock_module, htons);
298 GET_WINSOCK_FUNCTION(winsock_module, ntohs);
299 GET_WINSOCK_FUNCTION(winsock_module, gethostname);
300 GET_WINSOCK_FUNCTION(winsock_module, gethostbyname);
301 GET_WINSOCK_FUNCTION(winsock_module, getservbyname);
302 GET_WINSOCK_FUNCTION(winsock_module, inet_addr);
303 GET_WINSOCK_FUNCTION(winsock_module, inet_ntoa);
304 GET_WINSOCK_FUNCTION(winsock_module, connect);
305 GET_WINSOCK_FUNCTION(winsock_module, bind);
306 GET_WINSOCK_FUNCTION(winsock_module, setsockopt);
307 GET_WINSOCK_FUNCTION(winsock_module, socket);
308 GET_WINSOCK_FUNCTION(winsock_module, listen);
309 GET_WINSOCK_FUNCTION(winsock_module, send);
310 GET_WINSOCK_FUNCTION(winsock_module, ioctlsocket);
311 GET_WINSOCK_FUNCTION(winsock_module, accept);
312 GET_WINSOCK_FUNCTION(winsock_module, recv);
313 GET_WINSOCK_FUNCTION(winsock_module, WSAIoctl);
315 /* Try to get the best WinSock version we can get */
316 if (!sk_startup(2,2) &&
319 fatalbox("Unable to initialise WinSock");
322 sktree = newtree234(cmpfortree);
325 void sk_cleanup(void)
331 for (i = 0; (s = index234(sktree, i)) != NULL; i++) {
341 FreeLibrary(winsock_module);
344 FreeLibrary(wship6_module);
348 char *winsock_error_string(int error)
352 return "Network error: Permission denied";
354 return "Network error: Address already in use";
355 case WSAEADDRNOTAVAIL:
356 return "Network error: Cannot assign requested address";
357 case WSAEAFNOSUPPORT:
359 "Network error: Address family not supported by protocol family";
361 return "Network error: Operation already in progress";
362 case WSAECONNABORTED:
363 return "Network error: Software caused connection abort";
364 case WSAECONNREFUSED:
365 return "Network error: Connection refused";
367 return "Network error: Connection reset by peer";
368 case WSAEDESTADDRREQ:
369 return "Network error: Destination address required";
371 return "Network error: Bad address";
373 return "Network error: Host is down";
374 case WSAEHOSTUNREACH:
375 return "Network error: No route to host";
377 return "Network error: Operation now in progress";
379 return "Network error: Interrupted function call";
381 return "Network error: Invalid argument";
383 return "Network error: Socket is already connected";
385 return "Network error: Too many open files";
387 return "Network error: Message too long";
389 return "Network error: Network is down";
391 return "Network error: Network dropped connection on reset";
393 return "Network error: Network is unreachable";
395 return "Network error: No buffer space available";
397 return "Network error: Bad protocol option";
399 return "Network error: Socket is not connected";
401 return "Network error: Socket operation on non-socket";
403 return "Network error: Operation not supported";
404 case WSAEPFNOSUPPORT:
405 return "Network error: Protocol family not supported";
407 return "Network error: Too many processes";
408 case WSAEPROTONOSUPPORT:
409 return "Network error: Protocol not supported";
411 return "Network error: Protocol wrong type for socket";
413 return "Network error: Cannot send after socket shutdown";
414 case WSAESOCKTNOSUPPORT:
415 return "Network error: Socket type not supported";
417 return "Network error: Connection timed out";
419 return "Network error: Resource temporarily unavailable";
421 return "Network error: Graceful shutdown in progress";
423 return "Unknown network error";
427 SockAddr sk_namelookup(const char *host, char **canonicalname,
430 SockAddr ret = snew(struct SockAddr_tag);
432 struct hostent *h = NULL;
437 /* Default to IPv4. */
438 hint_family = (address_family == ADDRTYPE_IPV4 ? AF_INET :
440 address_family == ADDRTYPE_IPV6 ? AF_INET6 :
444 /* Clear the structure and default to IPv4. */
445 memset(ret, 0, sizeof(struct SockAddr_tag));
449 ret->addresses = NULL;
450 ret->resolved = FALSE;
454 if ((a = p_inet_addr(host)) == (unsigned long) INADDR_NONE) {
457 * Use getaddrinfo when it's available
460 struct addrinfo hints;
461 #ifdef NET_SETUP_DIAGNOSTICS
462 logevent(NULL, "Using getaddrinfo() for resolving");
464 memset(&hints, 0, sizeof(hints));
465 hints.ai_family = hint_family;
466 hints.ai_flags = AI_CANONNAME;
467 if ((err = p_getaddrinfo(host, NULL, &hints, &ret->ais)) == 0)
468 ret->resolved = TRUE;
472 #ifdef NET_SETUP_DIAGNOSTICS
473 logevent(NULL, "Using gethostbyname() for resolving");
476 * Otherwise use the IPv4-only gethostbyname...
477 * (NOTE: we don't use gethostbyname as a fallback!)
479 if ( (h = p_gethostbyname(host)) )
480 ret->resolved = TRUE;
482 err = p_WSAGetLastError();
485 if (!ret->resolved) {
486 ret->error = (err == WSAENETDOWN ? "Network is down" :
487 err == WSAHOST_NOT_FOUND ? "Host does not exist" :
488 err == WSATRY_AGAIN ? "Host not found" :
490 p_getaddrinfo&&p_gai_strerror ? p_gai_strerror(err) :
492 "gethostbyname: unknown error");
497 /* If we got an address info use that... */
499 /* Are we in IPv4 fallback mode? */
500 /* We put the IPv4 address into the a variable so we can further-on use the IPv4 code... */
501 if (ret->ais->ai_family == AF_INET)
503 (char *) &((SOCKADDR_IN *) ret->ais->
504 ai_addr)->sin_addr, sizeof(a));
506 if (ret->ais->ai_canonname)
507 strncpy(realhost, ret->ais->ai_canonname, lenof(realhost));
509 strncpy(realhost, host, lenof(realhost));
511 /* We used the IPv4-only gethostbyname()... */
516 for (n = 0; h->h_addr_list[n]; n++);
517 ret->addresses = snewn(n, unsigned long);
519 for (n = 0; n < ret->naddresses; n++) {
520 memcpy(&a, h->h_addr_list[n], sizeof(a));
521 ret->addresses[n] = p_ntohl(a);
523 memcpy(&a, h->h_addr, sizeof(a));
524 /* This way we are always sure the h->h_name is valid :) */
525 strncpy(realhost, h->h_name, sizeof(realhost));
530 * This must be a numeric IPv4 address because it caused a
531 * success return from inet_addr.
533 ret->addresses = snewn(1, unsigned long);
535 ret->addresses[0] = p_ntohl(a);
536 ret->resolved = TRUE;
537 strncpy(realhost, host, sizeof(realhost));
539 realhost[lenof(realhost)-1] = '\0';
540 *canonicalname = snewn(1+strlen(realhost), char);
541 strcpy(*canonicalname, realhost);
545 SockAddr sk_nonamelookup(const char *host)
547 SockAddr ret = snew(struct SockAddr_tag);
549 ret->resolved = FALSE;
553 ret->addresses = NULL;
556 strncpy(ret->hostname, host, lenof(ret->hostname));
557 ret->hostname[lenof(ret->hostname)-1] = '\0';
561 int sk_nextaddr(SockAddr addr, SockAddrStep *step)
565 if (step->ai->ai_next) {
566 step->ai = step->ai->ai_next;
572 if (step->curraddr+1 < addr->naddresses) {
580 void sk_getaddr(SockAddr addr, char *buf, int buflen)
583 START_STEP(addr, step);
587 if (p_WSAAddressToStringA) {
588 p_WSAAddressToStringA(step.ai->ai_addr, step.ai->ai_addrlen,
591 strncpy(buf, "IPv6", buflen);
594 if (SOCKADDR_FAMILY(addr, step) == AF_INET) {
596 assert(addr->addresses && step.curraddr < addr->naddresses);
597 a.s_addr = p_htonl(addr->addresses[step.curraddr]);
598 strncpy(buf, p_inet_ntoa(a), buflen);
599 buf[buflen-1] = '\0';
601 strncpy(buf, addr->hostname, buflen);
602 buf[buflen-1] = '\0';
606 int sk_hostname_is_local(char *name)
608 return !strcmp(name, "localhost") ||
609 !strcmp(name, "::1") ||
610 !strncmp(name, "127.", 4);
613 static INTERFACE_INFO local_interfaces[16];
614 static int n_local_interfaces; /* 0=not yet, -1=failed, >0=number */
616 static int ipv4_is_local_addr(struct in_addr addr)
618 if (ipv4_is_loopback(addr))
619 return 1; /* loopback addresses are local */
620 if (!n_local_interfaces) {
621 SOCKET s = p_socket(AF_INET, SOCK_DGRAM, 0);
625 p_WSAIoctl(s, SIO_GET_INTERFACE_LIST, NULL, 0,
626 local_interfaces, sizeof(local_interfaces),
627 &retbytes, NULL, NULL) == 0)
628 n_local_interfaces = retbytes / sizeof(INTERFACE_INFO);
630 logevent(NULL, "Unable to get list of local IP addresses");
632 if (n_local_interfaces > 0) {
634 for (i = 0; i < n_local_interfaces; i++) {
635 SOCKADDR_IN *address =
636 (SOCKADDR_IN *)&local_interfaces[i].iiAddress;
637 if (address->sin_addr.s_addr == addr.s_addr)
638 return 1; /* this address is local */
641 return 0; /* this address is not local */
644 int sk_address_is_local(SockAddr addr)
648 START_STEP(addr, step);
649 family = SOCKADDR_FAMILY(addr, step);
652 if (family == AF_INET6) {
653 return IN6_IS_ADDR_LOOPBACK((const struct in6_addr *)step.ai->ai_addr);
656 if (family == AF_INET) {
659 return ipv4_is_local_addr(((struct sockaddr_in *)step.ai->ai_addr)
665 assert(addr->addresses && step.curraddr < addr->naddresses);
666 a.s_addr = p_htonl(addr->addresses[step.curraddr]);
667 return ipv4_is_local_addr(a);
670 assert(family == AF_UNSPEC);
671 return 0; /* we don't know; assume not */
675 int sk_addrtype(SockAddr addr)
679 START_STEP(addr, step);
680 family = SOCKADDR_FAMILY(addr, step);
682 return (family == AF_INET ? ADDRTYPE_IPV4 :
684 family == AF_INET6 ? ADDRTYPE_IPV6 :
689 void sk_addrcopy(SockAddr addr, char *buf)
693 START_STEP(addr, step);
694 family = SOCKADDR_FAMILY(addr, step);
696 assert(family != AF_UNSPEC);
699 if (family == AF_INET)
700 memcpy(buf, &((struct sockaddr_in *)step.ai->ai_addr)->sin_addr,
701 sizeof(struct in_addr));
702 else if (family == AF_INET6)
703 memcpy(buf, &((struct sockaddr_in6 *)step.ai->ai_addr)->sin6_addr,
704 sizeof(struct in6_addr));
709 if (family == AF_INET) {
711 assert(addr->addresses && step.curraddr < addr->naddresses);
712 a.s_addr = p_htonl(addr->addresses[step.curraddr]);
713 memcpy(buf, (char*) &a.s_addr, 4);
717 void sk_addr_free(SockAddr addr)
719 if (--addr->refcount > 0)
722 if (addr->ais && p_freeaddrinfo)
723 p_freeaddrinfo(addr->ais);
726 sfree(addr->addresses);
730 SockAddr sk_addr_dup(SockAddr addr)
736 static Plug sk_tcp_plug(Socket sock, Plug p)
738 Actual_Socket s = (Actual_Socket) sock;
745 static void sk_tcp_flush(Socket s)
748 * We send data to the socket as soon as we can anyway,
749 * so we don't need to do anything here. :-)
753 static void sk_tcp_close(Socket s);
754 static int sk_tcp_write(Socket s, const char *data, int len);
755 static int sk_tcp_write_oob(Socket s, const char *data, int len);
756 static void sk_tcp_set_private_ptr(Socket s, void *ptr);
757 static void *sk_tcp_get_private_ptr(Socket s);
758 static void sk_tcp_set_frozen(Socket s, int is_frozen);
759 static const char *sk_tcp_socket_error(Socket s);
761 extern char *do_select(SOCKET skt, int startup);
763 Socket sk_register(void *sock, Plug plug)
765 static const struct socket_function_table fn_table = {
771 sk_tcp_set_private_ptr,
772 sk_tcp_get_private_ptr,
782 * Create Socket structure.
784 ret = snew(struct Socket_tag);
788 bufchain_init(&ret->output_data);
789 ret->writable = 1; /* to start with */
790 ret->sending_oob = 0;
792 ret->frozen_readable = 0;
793 ret->localhost_only = 0; /* unused, but best init anyway */
794 ret->pending_error = 0;
795 ret->parent = ret->child = NULL;
798 ret->s = (SOCKET)sock;
800 if (ret->s == INVALID_SOCKET) {
801 err = p_WSAGetLastError();
802 ret->error = winsock_error_string(err);
808 /* Set up a select mechanism. This could be an AsyncSelect on a
809 * window, or an EventSelect on an event object. */
810 errstr = do_select(ret->s, 1);
821 static DWORD try_connect(Actual_Socket sock)
833 if (sock->s != INVALID_SOCKET) {
834 do_select(sock->s, 0);
835 p_closesocket(sock->s);
838 plug_log(sock->plug, 0, sock->addr, sock->port, NULL, 0);
843 family = SOCKADDR_FAMILY(sock->addr, sock->step);
846 * Remove the socket from the tree before we overwrite its
847 * internal socket id, because that forms part of the tree's
848 * sorting criterion. We'll add it back before exiting this
849 * function, whether we changed anything or not.
851 del234(sktree, sock);
853 s = p_socket(family, SOCK_STREAM, 0);
856 if (s == INVALID_SOCKET) {
857 err = p_WSAGetLastError();
858 sock->error = winsock_error_string(err);
862 if (sock->oobinline) {
864 p_setsockopt(s, SOL_SOCKET, SO_OOBINLINE, (void *) &b, sizeof(b));
869 p_setsockopt(s, IPPROTO_TCP, TCP_NODELAY, (void *) &b, sizeof(b));
872 if (sock->keepalive) {
874 p_setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, (void *) &b, sizeof(b));
878 * Bind to local address.
881 localport = 1023; /* count from 1023 downwards */
883 localport = 0; /* just use port 0 (ie winsock picks) */
885 /* Loop round trying to bind */
890 if (family == AF_INET6) {
891 memset(&a6, 0, sizeof(a6));
892 a6.sin6_family = AF_INET6;
893 /*a6.sin6_addr = in6addr_any; */ /* == 0 done by memset() */
894 a6.sin6_port = p_htons(localport);
898 a.sin_family = AF_INET;
899 a.sin_addr.s_addr = p_htonl(INADDR_ANY);
900 a.sin_port = p_htons(localport);
903 sockcode = p_bind(s, (family == AF_INET6 ?
904 (struct sockaddr *) &a6 :
905 (struct sockaddr *) &a),
906 (family == AF_INET6 ? sizeof(a6) : sizeof(a)));
908 sockcode = p_bind(s, (struct sockaddr *) &a, sizeof(a));
910 if (sockcode != SOCKET_ERROR) {
914 err = p_WSAGetLastError();
915 if (err != WSAEADDRINUSE) /* failed, for a bad reason */
920 break; /* we're only looping once */
923 break; /* we might have got to the end */
927 sock->error = winsock_error_string(err);
932 * Connect to remote address.
936 if (family == AF_INET6) {
937 a6.sin6_family = AF_INET6;
938 a6.sin6_port = p_htons((short) sock->port);
940 ((struct sockaddr_in6 *) sock->step.ai->ai_addr)->sin6_addr;
941 a6.sin6_flowinfo = ((struct sockaddr_in6 *) sock->step.ai->ai_addr)->sin6_flowinfo;
942 a6.sin6_scope_id = ((struct sockaddr_in6 *) sock->step.ai->ai_addr)->sin6_scope_id;
944 a.sin_family = AF_INET;
946 ((struct sockaddr_in *) sock->step.ai->ai_addr)->sin_addr;
947 a.sin_port = p_htons((short) sock->port);
952 assert(sock->addr->addresses && sock->step.curraddr < sock->addr->naddresses);
953 a.sin_family = AF_INET;
954 a.sin_addr.s_addr = p_htonl(sock->addr->addresses[sock->step.curraddr]);
955 a.sin_port = p_htons((short) sock->port);
958 /* Set up a select mechanism. This could be an AsyncSelect on a
959 * window, or an EventSelect on an event object. */
960 errstr = do_select(s, 1);
962 sock->error = errstr;
970 ((family == AF_INET6) ? (struct sockaddr *) &a6 :
971 (struct sockaddr *) &a),
972 (family == AF_INET6) ? sizeof(a6) : sizeof(a))
974 p_connect(s, (struct sockaddr *) &a, sizeof(a))
977 err = p_WSAGetLastError();
979 * We expect a potential EWOULDBLOCK here, because the
980 * chances are the front end has done a select for
981 * FD_CONNECT, so that connect() will complete
984 if ( err != WSAEWOULDBLOCK ) {
985 sock->error = winsock_error_string(err);
990 * If we _don't_ get EWOULDBLOCK, the connect has completed
991 * and we should set the socket as writable.
1001 * No matter what happened, put the socket back in the tree.
1003 add234(sktree, sock);
1006 plug_log(sock->plug, 1, sock->addr, sock->port, sock->error, err);
1010 Socket sk_new(SockAddr addr, int port, int privport, int oobinline,
1011 int nodelay, int keepalive, Plug plug)
1013 static const struct socket_function_table fn_table = {
1019 sk_tcp_set_private_ptr,
1020 sk_tcp_get_private_ptr,
1029 * Create Socket structure.
1031 ret = snew(struct Socket_tag);
1032 ret->fn = &fn_table;
1035 bufchain_init(&ret->output_data);
1036 ret->connected = 0; /* to start with */
1037 ret->writable = 0; /* to start with */
1038 ret->sending_oob = 0;
1040 ret->frozen_readable = 0;
1041 ret->localhost_only = 0; /* unused, but best init anyway */
1042 ret->pending_error = 0;
1043 ret->parent = ret->child = NULL;
1044 ret->oobinline = oobinline;
1045 ret->nodelay = nodelay;
1046 ret->keepalive = keepalive;
1047 ret->privport = privport;
1050 START_STEP(ret->addr, ret->step);
1051 ret->s = INVALID_SOCKET;
1055 err = try_connect(ret);
1056 } while (err && sk_nextaddr(ret->addr, &ret->step));
1058 return (Socket) ret;
1061 Socket sk_newlistener(char *srcaddr, int port, Plug plug, int local_host_only,
1062 int orig_address_family)
1064 static const struct socket_function_table fn_table = {
1070 sk_tcp_set_private_ptr,
1071 sk_tcp_get_private_ptr,
1091 * Create Socket structure.
1093 ret = snew(struct Socket_tag);
1094 ret->fn = &fn_table;
1097 bufchain_init(&ret->output_data);
1098 ret->writable = 0; /* to start with */
1099 ret->sending_oob = 0;
1101 ret->frozen_readable = 0;
1102 ret->localhost_only = local_host_only;
1103 ret->pending_error = 0;
1104 ret->parent = ret->child = NULL;
1108 * Translate address_family from platform-independent constants
1109 * into local reality.
1111 address_family = (orig_address_family == ADDRTYPE_IPV4 ? AF_INET :
1113 orig_address_family == ADDRTYPE_IPV6 ? AF_INET6 :
1118 * Our default, if passed the `don't care' value
1119 * ADDRTYPE_UNSPEC, is to listen on IPv4. If IPv6 is supported,
1120 * we will also set up a second socket listening on IPv6, but
1121 * the v4 one is primary since that ought to work even on
1122 * non-v6-supporting systems.
1124 if (address_family == AF_UNSPEC) address_family = AF_INET;
1129 s = p_socket(address_family, SOCK_STREAM, 0);
1132 if (s == INVALID_SOCKET) {
1133 err = p_WSAGetLastError();
1134 ret->error = winsock_error_string(err);
1135 return (Socket) ret;
1140 p_setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (const char *)&on, sizeof(on));
1143 if (address_family == AF_INET6) {
1144 memset(&a6, 0, sizeof(a6));
1145 a6.sin6_family = AF_INET6;
1146 /* FIXME: srcaddr is ignored for IPv6, because I (SGT) don't
1147 * know how to do it. :-)
1148 * (jeroen:) saddr is specified as an address.. eg 2001:db8::1
1149 * Thus we need either a parser that understands [2001:db8::1]:80
1150 * style addresses and/or enhance this to understand hostnames too. */
1151 if (local_host_only)
1152 a6.sin6_addr = in6addr_loopback;
1154 a6.sin6_addr = in6addr_any;
1155 a6.sin6_port = p_htons(port);
1160 a.sin_family = AF_INET;
1163 * Bind to source address. First try an explicitly
1167 a.sin_addr.s_addr = p_inet_addr(srcaddr);
1168 if (a.sin_addr.s_addr != INADDR_NONE) {
1169 /* Override localhost_only with specified listen addr. */
1170 ret->localhost_only = ipv4_is_loopback(a.sin_addr);
1176 * ... and failing that, go with one of the standard ones.
1179 if (local_host_only)
1180 a.sin_addr.s_addr = p_htonl(INADDR_LOOPBACK);
1182 a.sin_addr.s_addr = p_htonl(INADDR_ANY);
1185 a.sin_port = p_htons((short)port);
1188 retcode = p_bind(s, (address_family == AF_INET6 ?
1189 (struct sockaddr *) &a6 :
1190 (struct sockaddr *) &a),
1192 AF_INET6 ? sizeof(a6) : sizeof(a)));
1194 retcode = p_bind(s, (struct sockaddr *) &a, sizeof(a));
1196 if (retcode != SOCKET_ERROR) {
1199 err = p_WSAGetLastError();
1204 ret->error = winsock_error_string(err);
1205 return (Socket) ret;
1209 if (p_listen(s, SOMAXCONN) == SOCKET_ERROR) {
1211 ret->error = winsock_error_string(err);
1212 return (Socket) ret;
1215 /* Set up a select mechanism. This could be an AsyncSelect on a
1216 * window, or an EventSelect on an event object. */
1217 errstr = do_select(s, 1);
1220 ret->error = errstr;
1221 return (Socket) ret;
1224 add234(sktree, ret);
1228 * If we were given ADDRTYPE_UNSPEC, we must also create an
1229 * IPv6 listening socket and link it to this one.
1231 if (address_family == AF_INET && orig_address_family == ADDRTYPE_UNSPEC) {
1232 Actual_Socket other;
1234 other = (Actual_Socket) sk_newlistener(srcaddr, port, plug,
1235 local_host_only, ADDRTYPE_IPV6);
1238 if (!other->error) {
1239 other->parent = ret;
1248 return (Socket) ret;
1251 static void sk_tcp_close(Socket sock)
1253 extern char *do_select(SOCKET skt, int startup);
1254 Actual_Socket s = (Actual_Socket) sock;
1257 sk_tcp_close((Socket)s->child);
1261 p_closesocket(s->s);
1263 sk_addr_free(s->addr);
1268 * The function which tries to send on a socket once it's deemed
1271 void try_send(Actual_Socket s)
1273 while (s->sending_oob || bufchain_size(&s->output_data) > 0) {
1277 int len, urgentflag;
1279 if (s->sending_oob) {
1280 urgentflag = MSG_OOB;
1281 len = s->sending_oob;
1285 bufchain_prefix(&s->output_data, &data, &len);
1287 nsent = p_send(s->s, data, len, urgentflag);
1288 noise_ultralight(nsent);
1290 err = (nsent < 0 ? p_WSAGetLastError() : 0);
1291 if ((err < WSABASEERR && nsent < 0) || err == WSAEWOULDBLOCK) {
1293 * Perfectly normal: we've sent all we can for the moment.
1295 * (Some WinSock send() implementations can return
1296 * <0 but leave no sensible error indication -
1297 * WSAGetLastError() is called but returns zero or
1298 * a small number - so we check that case and treat
1299 * it just like WSAEWOULDBLOCK.)
1301 s->writable = FALSE;
1303 } else if (nsent == 0 ||
1304 err == WSAECONNABORTED || err == WSAECONNRESET) {
1306 * If send() returns CONNABORTED or CONNRESET, we
1307 * unfortunately can't just call plug_closing(),
1308 * because it's quite likely that we're currently
1309 * _in_ a call from the code we'd be calling back
1310 * to, so we'd have to make half the SSH code
1311 * reentrant. Instead we flag a pending error on
1312 * the socket, to be dealt with (by calling
1313 * plug_closing()) at some suitable future moment.
1315 s->pending_error = err;
1318 /* We're inside the Windows frontend here, so we know
1319 * that the frontend handle is unnecessary. */
1320 logevent(NULL, winsock_error_string(err));
1321 fatalbox("%s", winsock_error_string(err));
1324 if (s->sending_oob) {
1326 memmove(s->oobdata, s->oobdata+nsent, len-nsent);
1327 s->sending_oob = len - nsent;
1332 bufchain_consume(&s->output_data, nsent);
1338 static int sk_tcp_write(Socket sock, const char *buf, int len)
1340 Actual_Socket s = (Actual_Socket) sock;
1343 * Add the data to the buffer list on the socket.
1345 bufchain_add(&s->output_data, buf, len);
1348 * Now try sending from the start of the buffer list.
1353 return bufchain_size(&s->output_data);
1356 static int sk_tcp_write_oob(Socket sock, const char *buf, int len)
1358 Actual_Socket s = (Actual_Socket) sock;
1361 * Replace the buffer list on the socket with the data.
1363 bufchain_clear(&s->output_data);
1364 assert(len <= sizeof(s->oobdata));
1365 memcpy(s->oobdata, buf, len);
1366 s->sending_oob = len;
1369 * Now try sending from the start of the buffer list.
1374 return s->sending_oob;
1377 int select_result(WPARAM wParam, LPARAM lParam)
1381 char buf[20480]; /* nice big buffer for plenty of speed */
1385 /* wParam is the socket itself */
1388 return 1; /* boggle */
1390 s = find234(sktree, (void *) wParam, cmpforsearch);
1392 return 1; /* boggle */
1394 if ((err = WSAGETSELECTERROR(lParam)) != 0) {
1396 * An error has occurred on this socket. Pass it to the
1400 plug_log(s->plug, 1, s->addr, s->port,
1401 winsock_error_string(err), err);
1402 while (s->addr && sk_nextaddr(s->addr, &s->step)) {
1403 err = try_connect(s);
1407 return plug_closing(s->plug, winsock_error_string(err), err, 0);
1412 noise_ultralight(lParam);
1414 switch (WSAGETSELECTEVENT(lParam)) {
1416 s->connected = s->writable = 1;
1418 * Once a socket is connected, we can stop falling
1419 * back through the candidate addresses to connect
1423 sk_addr_free(s->addr);
1428 /* In the case the socket is still frozen, we don't even bother */
1430 s->frozen_readable = 1;
1435 * We have received data on the socket. For an oobinline
1436 * socket, this might be data _before_ an urgent pointer,
1437 * in which case we send it to the back end with type==1
1438 * (data prior to urgent).
1442 p_ioctlsocket(s->s, SIOCATMARK, &atmark);
1444 * Avoid checking the return value from ioctlsocket(),
1445 * on the grounds that some WinSock wrappers don't
1446 * support it. If it does nothing, we get atmark==1,
1447 * which is equivalent to `no OOB pending', so the
1448 * effect will be to non-OOB-ify any OOB data.
1453 ret = p_recv(s->s, buf, sizeof(buf), 0);
1454 noise_ultralight(ret);
1456 err = p_WSAGetLastError();
1457 if (err == WSAEWOULDBLOCK) {
1462 return plug_closing(s->plug, winsock_error_string(err), err,
1464 } else if (0 == ret) {
1465 return plug_closing(s->plug, NULL, 0, 0);
1467 return plug_receive(s->plug, atmark ? 0 : 1, buf, ret);
1472 * This will only happen on a non-oobinline socket. It
1473 * indicates that we can immediately perform an OOB read
1474 * and get back OOB data, which we will send to the back
1475 * end with type==2 (urgent data).
1477 ret = p_recv(s->s, buf, sizeof(buf), MSG_OOB);
1478 noise_ultralight(ret);
1480 char *str = (ret == 0 ? "Internal networking trouble" :
1481 winsock_error_string(p_WSAGetLastError()));
1482 /* We're inside the Windows frontend here, so we know
1483 * that the frontend handle is unnecessary. */
1484 logevent(NULL, str);
1485 fatalbox("%s", str);
1487 return plug_receive(s->plug, 2, buf, ret);
1492 int bufsize_before, bufsize_after;
1494 bufsize_before = s->sending_oob + bufchain_size(&s->output_data);
1496 bufsize_after = s->sending_oob + bufchain_size(&s->output_data);
1497 if (bufsize_after < bufsize_before)
1498 plug_sent(s->plug, bufsize_after);
1502 /* Signal a close on the socket. First read any outstanding data. */
1505 ret = p_recv(s->s, buf, sizeof(buf), 0);
1507 err = p_WSAGetLastError();
1508 if (err == WSAEWOULDBLOCK)
1510 return plug_closing(s->plug, winsock_error_string(err),
1514 open &= plug_receive(s->plug, 0, buf, ret);
1516 open &= plug_closing(s->plug, NULL, 0, 0);
1523 struct sockaddr_in isa;
1525 struct sockaddr_storage isa;
1527 int addrlen = sizeof(isa);
1528 SOCKET t; /* socket of connection */
1530 memset(&isa, 0, sizeof(isa));
1532 t = p_accept(s->s,(struct sockaddr *)&isa,&addrlen);
1533 if (t == INVALID_SOCKET)
1535 err = p_WSAGetLastError();
1536 if (err == WSATRY_AGAIN)
1540 if (isa.ss_family == AF_INET &&
1541 s->localhost_only &&
1542 !ipv4_is_local_addr(((struct sockaddr_in *)&isa)->sin_addr))
1544 if (s->localhost_only && !ipv4_is_local_addr(isa.sin_addr))
1547 p_closesocket(t); /* dodgy WinSock let nonlocal through */
1548 } else if (plug_accepting(s->plug, (void*)t)) {
1549 p_closesocket(t); /* denied or error */
1558 * Deal with socket errors detected in try_send().
1560 void net_pending_errors(void)
1566 * This might be a fiddly business, because it's just possible
1567 * that handling a pending error on one socket might cause
1568 * others to be closed. (I can't think of any reason this might
1569 * happen in current SSH implementation, but to maintain
1570 * generality of this network layer I'll assume the worst.)
1572 * So what we'll do is search the socket list for _one_ socket
1573 * with a pending error, and then handle it, and then search
1574 * the list again _from the beginning_. Repeat until we make a
1575 * pass with no socket errors present. That way we are
1576 * protected against the socket list changing under our feet.
1580 for (i = 0; (s = index234(sktree, i)) != NULL; i++) {
1581 if (s->pending_error) {
1583 * An error has occurred on this socket. Pass it to the
1586 plug_closing(s->plug,
1587 winsock_error_string(s->pending_error),
1588 s->pending_error, 0);
1596 * Each socket abstraction contains a `void *' private field in
1597 * which the client can keep state.
1599 static void sk_tcp_set_private_ptr(Socket sock, void *ptr)
1601 Actual_Socket s = (Actual_Socket) sock;
1602 s->private_ptr = ptr;
1605 static void *sk_tcp_get_private_ptr(Socket sock)
1607 Actual_Socket s = (Actual_Socket) sock;
1608 return s->private_ptr;
1612 * Special error values are returned from sk_namelookup and sk_new
1613 * if there's a problem. These functions extract an error message,
1614 * or return NULL if there's no problem.
1616 const char *sk_addr_error(SockAddr addr)
1620 static const char *sk_tcp_socket_error(Socket sock)
1622 Actual_Socket s = (Actual_Socket) sock;
1626 static void sk_tcp_set_frozen(Socket sock, int is_frozen)
1628 Actual_Socket s = (Actual_Socket) sock;
1629 if (s->frozen == is_frozen)
1631 s->frozen = is_frozen;
1634 if (s->frozen_readable) {
1636 p_recv(s->s, &c, 1, MSG_PEEK);
1639 s->frozen_readable = 0;
1642 void socket_reselect_all(void)
1647 for (i = 0; (s = index234(sktree, i)) != NULL; i++) {
1654 * For Plink: enumerate all sockets currently active.
1656 SOCKET first_socket(int *state)
1660 s = index234(sktree, (*state)++);
1661 return s ? s->s : INVALID_SOCKET;
1664 SOCKET next_socket(int *state)
1666 Actual_Socket s = index234(sktree, (*state)++);
1667 return s ? s->s : INVALID_SOCKET;
1670 extern int socket_writable(SOCKET skt)
1672 Actual_Socket s = find234(sktree, (void *)skt, cmpforsearch);
1675 return bufchain_size(&s->output_data) > 0;
1680 int net_service_lookup(char *service)
1683 se = p_getservbyname(service, NULL);
1685 return p_ntohs(se->s_port);
1690 char *get_hostname(void)
1693 char *hostname = NULL;
1696 hostname = sresize(hostname, len, char);
1697 if (p_gethostname(hostname, len) < 0) {
1702 } while (strlen(hostname) >= len-1);
1706 SockAddr platform_get_x11_unix_address(const char *display, int displaynum,
1707 char **canonicalname)
1709 SockAddr ret = snew(struct SockAddr_tag);
1710 memset(ret, 0, sizeof(struct SockAddr_tag));
1711 ret->error = "unix sockets not supported on this platform";