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, struct hostent FAR *, gethostbyname,
172 DECL_WINSOCK_FUNCTION(static, struct servent FAR *, getservbyname,
173 (const char FAR *, const char FAR *));
174 DECL_WINSOCK_FUNCTION(static, unsigned long, inet_addr, (const char FAR *));
175 DECL_WINSOCK_FUNCTION(static, char FAR *, inet_ntoa, (struct in_addr));
176 DECL_WINSOCK_FUNCTION(static, int, connect,
177 (SOCKET, const struct sockaddr FAR *, int));
178 DECL_WINSOCK_FUNCTION(static, int, bind,
179 (SOCKET, const struct sockaddr FAR *, int));
180 DECL_WINSOCK_FUNCTION(static, int, setsockopt,
181 (SOCKET, int, int, const char FAR *, int));
182 DECL_WINSOCK_FUNCTION(static, SOCKET, socket, (int, int, int));
183 DECL_WINSOCK_FUNCTION(static, int, listen, (SOCKET, int));
184 DECL_WINSOCK_FUNCTION(static, int, send, (SOCKET, const char FAR *, int, int));
185 DECL_WINSOCK_FUNCTION(static, int, ioctlsocket,
186 (SOCKET, long, u_long FAR *));
187 DECL_WINSOCK_FUNCTION(static, SOCKET, accept,
188 (SOCKET, struct sockaddr FAR *, int FAR *));
189 DECL_WINSOCK_FUNCTION(static, int, recv, (SOCKET, char FAR *, int, int));
190 DECL_WINSOCK_FUNCTION(static, int, WSAIoctl,
191 (SOCKET, DWORD, LPVOID, DWORD, LPVOID, DWORD,
192 LPDWORD, LPWSAOVERLAPPED,
193 LPWSAOVERLAPPED_COMPLETION_ROUTINE));
195 DECL_WINSOCK_FUNCTION(static, int, getaddrinfo,
196 (const char *nodename, const char *servname,
197 const struct addrinfo *hints, struct addrinfo **res));
198 DECL_WINSOCK_FUNCTION(static, void, freeaddrinfo, (struct addrinfo *res));
199 DECL_WINSOCK_FUNCTION(static, int, getnameinfo,
200 (const struct sockaddr FAR * sa, socklen_t salen,
201 char FAR * host, size_t hostlen, char FAR * serv,
202 size_t servlen, int flags));
203 DECL_WINSOCK_FUNCTION(static, char *, gai_strerror, (int ecode));
204 DECL_WINSOCK_FUNCTION(static, int, WSAAddressToStringA,
205 (LPSOCKADDR, DWORD, LPWSAPROTOCOL_INFO,
209 static HMODULE winsock_module = NULL;
210 static WSADATA wsadata;
212 static HMODULE winsock2_module = NULL;
213 static HMODULE wship6_module = NULL;
216 int sk_startup(int hi, int lo)
220 winsock_ver = MAKEWORD(hi, lo);
222 if (p_WSAStartup(winsock_ver, &wsadata)) {
226 if (LOBYTE(wsadata.wVersion) != LOBYTE(winsock_ver)) {
230 #ifdef NET_SETUP_DIAGNOSTICS
233 sprintf(buf, "Using WinSock %d.%d", hi, lo);
245 winsock_module = LoadLibrary("WS2_32.DLL");
246 if (!winsock_module) {
247 winsock_module = LoadLibrary("WSOCK32.DLL");
250 fatalbox("Unable to load any WinSock library");
253 /* Check if we have getaddrinfo in Winsock */
254 if (GetProcAddress(winsock_module, "getaddrinfo") != NULL) {
255 #ifdef NET_SETUP_DIAGNOSTICS
256 logevent(NULL, "Native WinSock IPv6 support detected");
258 GET_WINSOCK_FUNCTION(winsock_module, getaddrinfo);
259 GET_WINSOCK_FUNCTION(winsock_module, freeaddrinfo);
260 GET_WINSOCK_FUNCTION(winsock_module, getnameinfo);
261 GET_WINSOCK_FUNCTION(winsock_module, gai_strerror);
263 /* Fall back to wship6.dll for Windows 2000 */
264 wship6_module = LoadLibrary("wship6.dll");
266 #ifdef NET_SETUP_DIAGNOSTICS
267 logevent(NULL, "WSH IPv6 support detected");
269 GET_WINSOCK_FUNCTION(wship6_module, getaddrinfo);
270 GET_WINSOCK_FUNCTION(wship6_module, freeaddrinfo);
271 GET_WINSOCK_FUNCTION(wship6_module, getnameinfo);
272 GET_WINSOCK_FUNCTION(wship6_module, gai_strerror);
274 #ifdef NET_SETUP_DIAGNOSTICS
275 logevent(NULL, "No IPv6 support detected");
279 GET_WINSOCK_FUNCTION(winsock2_module, WSAAddressToStringA);
281 #ifdef NET_SETUP_DIAGNOSTICS
282 logevent(NULL, "PuTTY was built without IPv6 support");
286 GET_WINSOCK_FUNCTION(winsock_module, WSAAsyncSelect);
287 GET_WINSOCK_FUNCTION(winsock_module, WSAEventSelect);
288 GET_WINSOCK_FUNCTION(winsock_module, select);
289 GET_WINSOCK_FUNCTION(winsock_module, WSAGetLastError);
290 GET_WINSOCK_FUNCTION(winsock_module, WSAEnumNetworkEvents);
291 GET_WINSOCK_FUNCTION(winsock_module, WSAStartup);
292 GET_WINSOCK_FUNCTION(winsock_module, WSACleanup);
293 GET_WINSOCK_FUNCTION(winsock_module, closesocket);
294 GET_WINSOCK_FUNCTION(winsock_module, ntohl);
295 GET_WINSOCK_FUNCTION(winsock_module, htonl);
296 GET_WINSOCK_FUNCTION(winsock_module, htons);
297 GET_WINSOCK_FUNCTION(winsock_module, ntohs);
298 GET_WINSOCK_FUNCTION(winsock_module, gethostbyname);
299 GET_WINSOCK_FUNCTION(winsock_module, getservbyname);
300 GET_WINSOCK_FUNCTION(winsock_module, inet_addr);
301 GET_WINSOCK_FUNCTION(winsock_module, inet_ntoa);
302 GET_WINSOCK_FUNCTION(winsock_module, connect);
303 GET_WINSOCK_FUNCTION(winsock_module, bind);
304 GET_WINSOCK_FUNCTION(winsock_module, setsockopt);
305 GET_WINSOCK_FUNCTION(winsock_module, socket);
306 GET_WINSOCK_FUNCTION(winsock_module, listen);
307 GET_WINSOCK_FUNCTION(winsock_module, send);
308 GET_WINSOCK_FUNCTION(winsock_module, ioctlsocket);
309 GET_WINSOCK_FUNCTION(winsock_module, accept);
310 GET_WINSOCK_FUNCTION(winsock_module, recv);
311 GET_WINSOCK_FUNCTION(winsock_module, WSAIoctl);
313 /* Try to get the best WinSock version we can get */
314 if (!sk_startup(2,2) &&
317 fatalbox("Unable to initialise WinSock");
320 sktree = newtree234(cmpfortree);
323 void sk_cleanup(void)
329 for (i = 0; (s = index234(sktree, i)) != NULL; i++) {
338 FreeLibrary(winsock_module);
341 FreeLibrary(wship6_module);
345 char *winsock_error_string(int error)
349 return "Network error: Permission denied";
351 return "Network error: Address already in use";
352 case WSAEADDRNOTAVAIL:
353 return "Network error: Cannot assign requested address";
354 case WSAEAFNOSUPPORT:
356 "Network error: Address family not supported by protocol family";
358 return "Network error: Operation already in progress";
359 case WSAECONNABORTED:
360 return "Network error: Software caused connection abort";
361 case WSAECONNREFUSED:
362 return "Network error: Connection refused";
364 return "Network error: Connection reset by peer";
365 case WSAEDESTADDRREQ:
366 return "Network error: Destination address required";
368 return "Network error: Bad address";
370 return "Network error: Host is down";
371 case WSAEHOSTUNREACH:
372 return "Network error: No route to host";
374 return "Network error: Operation now in progress";
376 return "Network error: Interrupted function call";
378 return "Network error: Invalid argument";
380 return "Network error: Socket is already connected";
382 return "Network error: Too many open files";
384 return "Network error: Message too long";
386 return "Network error: Network is down";
388 return "Network error: Network dropped connection on reset";
390 return "Network error: Network is unreachable";
392 return "Network error: No buffer space available";
394 return "Network error: Bad protocol option";
396 return "Network error: Socket is not connected";
398 return "Network error: Socket operation on non-socket";
400 return "Network error: Operation not supported";
401 case WSAEPFNOSUPPORT:
402 return "Network error: Protocol family not supported";
404 return "Network error: Too many processes";
405 case WSAEPROTONOSUPPORT:
406 return "Network error: Protocol not supported";
408 return "Network error: Protocol wrong type for socket";
410 return "Network error: Cannot send after socket shutdown";
411 case WSAESOCKTNOSUPPORT:
412 return "Network error: Socket type not supported";
414 return "Network error: Connection timed out";
416 return "Network error: Resource temporarily unavailable";
418 return "Network error: Graceful shutdown in progress";
420 return "Unknown network error";
424 SockAddr sk_namelookup(const char *host, char **canonicalname,
427 SockAddr ret = snew(struct SockAddr_tag);
429 struct hostent *h = NULL;
434 /* Default to IPv4. */
435 hint_family = (address_family == ADDRTYPE_IPV4 ? AF_INET :
437 address_family == ADDRTYPE_IPV6 ? AF_INET6 :
441 /* Clear the structure and default to IPv4. */
442 memset(ret, 0, sizeof(struct SockAddr_tag));
446 ret->addresses = NULL;
447 ret->resolved = FALSE;
451 if ((a = p_inet_addr(host)) == (unsigned long) INADDR_NONE) {
454 * Use getaddrinfo when it's available
457 struct addrinfo hints;
458 #ifdef NET_SETUP_DIAGNOSTICS
459 logevent(NULL, "Using getaddrinfo() for resolving");
461 memset(&hints, 0, sizeof(hints));
462 hints.ai_family = hint_family;
463 hints.ai_flags = AI_CANONNAME;
464 if ((err = p_getaddrinfo(host, NULL, &hints, &ret->ais)) == 0)
465 ret->resolved = TRUE;
469 #ifdef NET_SETUP_DIAGNOSTICS
470 logevent(NULL, "Using gethostbyname() for resolving");
473 * Otherwise use the IPv4-only gethostbyname...
474 * (NOTE: we don't use gethostbyname as a fallback!)
476 if ( (h = p_gethostbyname(host)) )
477 ret->resolved = TRUE;
479 err = p_WSAGetLastError();
482 if (!ret->resolved) {
483 ret->error = (err == WSAENETDOWN ? "Network is down" :
484 err == WSAHOST_NOT_FOUND ? "Host does not exist" :
485 err == WSATRY_AGAIN ? "Host not found" :
487 p_getaddrinfo&&p_gai_strerror ? p_gai_strerror(err) :
489 "gethostbyname: unknown error");
494 /* If we got an address info use that... */
496 /* Are we in IPv4 fallback mode? */
497 /* We put the IPv4 address into the a variable so we can further-on use the IPv4 code... */
498 if (ret->ais->ai_family == AF_INET)
500 (char *) &((SOCKADDR_IN *) ret->ais->
501 ai_addr)->sin_addr, sizeof(a));
503 if (ret->ais->ai_canonname)
504 strncpy(realhost, ret->ais->ai_canonname, lenof(realhost));
506 strncpy(realhost, host, lenof(realhost));
508 /* We used the IPv4-only gethostbyname()... */
513 for (n = 0; h->h_addr_list[n]; n++);
514 ret->addresses = snewn(n, unsigned long);
516 for (n = 0; n < ret->naddresses; n++) {
517 memcpy(&a, h->h_addr_list[n], sizeof(a));
518 ret->addresses[n] = p_ntohl(a);
520 memcpy(&a, h->h_addr, sizeof(a));
521 /* This way we are always sure the h->h_name is valid :) */
522 strncpy(realhost, h->h_name, sizeof(realhost));
527 * This must be a numeric IPv4 address because it caused a
528 * success return from inet_addr.
530 ret->addresses = snewn(1, unsigned long);
532 ret->addresses[0] = p_ntohl(a);
533 ret->resolved = TRUE;
534 strncpy(realhost, host, sizeof(realhost));
536 realhost[lenof(realhost)-1] = '\0';
537 *canonicalname = snewn(1+strlen(realhost), char);
538 strcpy(*canonicalname, realhost);
542 SockAddr sk_nonamelookup(const char *host)
544 SockAddr ret = snew(struct SockAddr_tag);
546 ret->resolved = FALSE;
550 ret->addresses = NULL;
553 strncpy(ret->hostname, host, lenof(ret->hostname));
554 ret->hostname[lenof(ret->hostname)-1] = '\0';
558 int sk_nextaddr(SockAddr addr, SockAddrStep *step)
562 if (step->ai->ai_next) {
563 step->ai = step->ai->ai_next;
569 if (step->curraddr+1 < addr->naddresses) {
577 void sk_getaddr(SockAddr addr, char *buf, int buflen)
580 START_STEP(addr, step);
584 if (p_WSAAddressToStringA) {
585 p_WSAAddressToStringA(step.ai->ai_addr, step.ai->ai_addrlen,
588 strncpy(buf, "IPv6", buflen);
591 if (SOCKADDR_FAMILY(addr, step) == AF_INET) {
593 assert(addr->addresses && step.curraddr < addr->naddresses);
594 a.s_addr = p_htonl(addr->addresses[step.curraddr]);
595 strncpy(buf, p_inet_ntoa(a), buflen);
596 buf[buflen-1] = '\0';
598 strncpy(buf, addr->hostname, buflen);
599 buf[buflen-1] = '\0';
603 int sk_hostname_is_local(char *name)
605 return !strcmp(name, "localhost");
608 static INTERFACE_INFO local_interfaces[16];
609 static int n_local_interfaces; /* 0=not yet, -1=failed, >0=number */
611 static int ipv4_is_local_addr(struct in_addr addr)
613 if (ipv4_is_loopback(addr))
614 return 1; /* loopback addresses are local */
615 if (!n_local_interfaces) {
616 SOCKET s = p_socket(AF_INET, SOCK_DGRAM, 0);
620 p_WSAIoctl(s, SIO_GET_INTERFACE_LIST, NULL, 0,
621 local_interfaces, sizeof(local_interfaces),
622 &retbytes, NULL, NULL) == 0)
623 n_local_interfaces = retbytes / sizeof(INTERFACE_INFO);
625 logevent(NULL, "Unable to get list of local IP addresses");
627 if (n_local_interfaces > 0) {
629 for (i = 0; i < n_local_interfaces; i++) {
630 SOCKADDR_IN *address =
631 (SOCKADDR_IN *)&local_interfaces[i].iiAddress;
632 if (address->sin_addr.s_addr == addr.s_addr)
633 return 1; /* this address is local */
636 return 0; /* this address is not local */
639 int sk_address_is_local(SockAddr addr)
643 START_STEP(addr, step);
644 family = SOCKADDR_FAMILY(addr, step);
647 if (family == AF_INET6) {
648 return IN6_IS_ADDR_LOOPBACK((const struct in6_addr *)step.ai->ai_addr);
651 if (family == AF_INET) {
654 return ipv4_is_local_addr(((struct sockaddr_in *)step.ai->ai_addr)
660 assert(addr->addresses && step.curraddr < addr->naddresses);
661 a.s_addr = p_htonl(addr->addresses[step.curraddr]);
662 return ipv4_is_local_addr(a);
665 assert(family == AF_UNSPEC);
666 return 0; /* we don't know; assume not */
670 int sk_addrtype(SockAddr addr)
674 START_STEP(addr, step);
675 family = SOCKADDR_FAMILY(addr, step);
677 return (family == AF_INET ? ADDRTYPE_IPV4 :
679 family == AF_INET6 ? ADDRTYPE_IPV6 :
684 void sk_addrcopy(SockAddr addr, char *buf)
688 START_STEP(addr, step);
689 family = SOCKADDR_FAMILY(addr, step);
691 assert(family != AF_UNSPEC);
694 if (family == AF_INET)
695 memcpy(buf, &((struct sockaddr_in *)step.ai->ai_addr)->sin_addr,
696 sizeof(struct in_addr));
697 else if (family == AF_INET6)
698 memcpy(buf, &((struct sockaddr_in6 *)step.ai->ai_addr)->sin6_addr,
699 sizeof(struct in6_addr));
704 if (family == AF_INET) {
706 assert(addr->addresses && step.curraddr < addr->naddresses);
707 a.s_addr = p_htonl(addr->addresses[step.curraddr]);
708 memcpy(buf, (char*) &a.s_addr, 4);
712 void sk_addr_free(SockAddr addr)
714 if (--addr->refcount > 0)
717 if (addr->ais && p_freeaddrinfo)
718 p_freeaddrinfo(addr->ais);
721 sfree(addr->addresses);
725 SockAddr sk_addr_dup(SockAddr addr)
731 static Plug sk_tcp_plug(Socket sock, Plug p)
733 Actual_Socket s = (Actual_Socket) sock;
740 static void sk_tcp_flush(Socket s)
743 * We send data to the socket as soon as we can anyway,
744 * so we don't need to do anything here. :-)
748 static void sk_tcp_close(Socket s);
749 static int sk_tcp_write(Socket s, const char *data, int len);
750 static int sk_tcp_write_oob(Socket s, const char *data, int len);
751 static void sk_tcp_set_private_ptr(Socket s, void *ptr);
752 static void *sk_tcp_get_private_ptr(Socket s);
753 static void sk_tcp_set_frozen(Socket s, int is_frozen);
754 static const char *sk_tcp_socket_error(Socket s);
756 extern char *do_select(SOCKET skt, int startup);
758 Socket sk_register(void *sock, Plug plug)
760 static const struct socket_function_table fn_table = {
766 sk_tcp_set_private_ptr,
767 sk_tcp_get_private_ptr,
777 * Create Socket structure.
779 ret = snew(struct Socket_tag);
783 bufchain_init(&ret->output_data);
784 ret->writable = 1; /* to start with */
785 ret->sending_oob = 0;
787 ret->frozen_readable = 0;
788 ret->localhost_only = 0; /* unused, but best init anyway */
789 ret->pending_error = 0;
790 ret->parent = ret->child = NULL;
793 ret->s = (SOCKET)sock;
795 if (ret->s == INVALID_SOCKET) {
796 err = p_WSAGetLastError();
797 ret->error = winsock_error_string(err);
803 /* Set up a select mechanism. This could be an AsyncSelect on a
804 * window, or an EventSelect on an event object. */
805 errstr = do_select(ret->s, 1);
816 static DWORD try_connect(Actual_Socket sock)
828 if (sock->s != INVALID_SOCKET) {
829 do_select(sock->s, 0);
830 p_closesocket(sock->s);
833 plug_log(sock->plug, 0, sock->addr, sock->port, NULL, 0);
838 family = SOCKADDR_FAMILY(sock->addr, sock->step);
841 * Remove the socket from the tree before we overwrite its
842 * internal socket id, because that forms part of the tree's
843 * sorting criterion. We'll add it back before exiting this
844 * function, whether we changed anything or not.
846 del234(sktree, sock);
848 s = p_socket(family, SOCK_STREAM, 0);
851 if (s == INVALID_SOCKET) {
852 err = p_WSAGetLastError();
853 sock->error = winsock_error_string(err);
857 if (sock->oobinline) {
859 p_setsockopt(s, SOL_SOCKET, SO_OOBINLINE, (void *) &b, sizeof(b));
864 p_setsockopt(s, IPPROTO_TCP, TCP_NODELAY, (void *) &b, sizeof(b));
867 if (sock->keepalive) {
869 p_setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, (void *) &b, sizeof(b));
873 * Bind to local address.
876 localport = 1023; /* count from 1023 downwards */
878 localport = 0; /* just use port 0 (ie winsock picks) */
880 /* Loop round trying to bind */
885 if (family == AF_INET6) {
886 memset(&a6, 0, sizeof(a6));
887 a6.sin6_family = AF_INET6;
888 /*a6.sin6_addr = in6addr_any; */ /* == 0 done by memset() */
889 a6.sin6_port = p_htons(localport);
893 a.sin_family = AF_INET;
894 a.sin_addr.s_addr = p_htonl(INADDR_ANY);
895 a.sin_port = p_htons(localport);
898 sockcode = p_bind(s, (family == AF_INET6 ?
899 (struct sockaddr *) &a6 :
900 (struct sockaddr *) &a),
901 (family == AF_INET6 ? sizeof(a6) : sizeof(a)));
903 sockcode = p_bind(s, (struct sockaddr *) &a, sizeof(a));
905 if (sockcode != SOCKET_ERROR) {
909 err = p_WSAGetLastError();
910 if (err != WSAEADDRINUSE) /* failed, for a bad reason */
915 break; /* we're only looping once */
918 break; /* we might have got to the end */
922 sock->error = winsock_error_string(err);
927 * Connect to remote address.
931 if (family == AF_INET6) {
932 a6.sin6_family = AF_INET6;
933 a6.sin6_port = p_htons((short) sock->port);
935 ((struct sockaddr_in6 *) sock->step.ai->ai_addr)->sin6_addr;
936 a6.sin6_flowinfo = ((struct sockaddr_in6 *) sock->step.ai->ai_addr)->sin6_flowinfo;
937 a6.sin6_scope_id = ((struct sockaddr_in6 *) sock->step.ai->ai_addr)->sin6_scope_id;
939 a.sin_family = AF_INET;
941 ((struct sockaddr_in *) sock->step.ai->ai_addr)->sin_addr;
942 a.sin_port = p_htons((short) sock->port);
947 assert(sock->addr->addresses && sock->step.curraddr < sock->addr->naddresses);
948 a.sin_family = AF_INET;
949 a.sin_addr.s_addr = p_htonl(sock->addr->addresses[sock->step.curraddr]);
950 a.sin_port = p_htons((short) sock->port);
953 /* Set up a select mechanism. This could be an AsyncSelect on a
954 * window, or an EventSelect on an event object. */
955 errstr = do_select(s, 1);
957 sock->error = errstr;
965 ((family == AF_INET6) ? (struct sockaddr *) &a6 :
966 (struct sockaddr *) &a),
967 (family == AF_INET6) ? sizeof(a6) : sizeof(a))
969 p_connect(s, (struct sockaddr *) &a, sizeof(a))
972 err = p_WSAGetLastError();
974 * We expect a potential EWOULDBLOCK here, because the
975 * chances are the front end has done a select for
976 * FD_CONNECT, so that connect() will complete
979 if ( err != WSAEWOULDBLOCK ) {
980 sock->error = winsock_error_string(err);
985 * If we _don't_ get EWOULDBLOCK, the connect has completed
986 * and we should set the socket as writable.
996 * No matter what happened, put the socket back in the tree.
998 add234(sktree, sock);
1001 plug_log(sock->plug, 1, sock->addr, sock->port, sock->error, err);
1005 Socket sk_new(SockAddr addr, int port, int privport, int oobinline,
1006 int nodelay, int keepalive, Plug plug)
1008 static const struct socket_function_table fn_table = {
1014 sk_tcp_set_private_ptr,
1015 sk_tcp_get_private_ptr,
1024 * Create Socket structure.
1026 ret = snew(struct Socket_tag);
1027 ret->fn = &fn_table;
1030 bufchain_init(&ret->output_data);
1031 ret->connected = 0; /* to start with */
1032 ret->writable = 0; /* to start with */
1033 ret->sending_oob = 0;
1035 ret->frozen_readable = 0;
1036 ret->localhost_only = 0; /* unused, but best init anyway */
1037 ret->pending_error = 0;
1038 ret->parent = ret->child = NULL;
1039 ret->oobinline = oobinline;
1040 ret->nodelay = nodelay;
1041 ret->keepalive = keepalive;
1042 ret->privport = privport;
1045 START_STEP(ret->addr, ret->step);
1046 ret->s = INVALID_SOCKET;
1050 err = try_connect(ret);
1051 } while (err && sk_nextaddr(ret->addr, &ret->step));
1053 return (Socket) ret;
1056 Socket sk_newlistener(char *srcaddr, int port, Plug plug, int local_host_only,
1057 int orig_address_family)
1059 static const struct socket_function_table fn_table = {
1065 sk_tcp_set_private_ptr,
1066 sk_tcp_get_private_ptr,
1086 * Create Socket structure.
1088 ret = snew(struct Socket_tag);
1089 ret->fn = &fn_table;
1092 bufchain_init(&ret->output_data);
1093 ret->writable = 0; /* to start with */
1094 ret->sending_oob = 0;
1096 ret->frozen_readable = 0;
1097 ret->localhost_only = local_host_only;
1098 ret->pending_error = 0;
1099 ret->parent = ret->child = NULL;
1103 * Translate address_family from platform-independent constants
1104 * into local reality.
1106 address_family = (orig_address_family == ADDRTYPE_IPV4 ? AF_INET :
1108 orig_address_family == ADDRTYPE_IPV6 ? AF_INET6 :
1113 * Our default, if passed the `don't care' value
1114 * ADDRTYPE_UNSPEC, is to listen on IPv4. If IPv6 is supported,
1115 * we will also set up a second socket listening on IPv6, but
1116 * the v4 one is primary since that ought to work even on
1117 * non-v6-supporting systems.
1119 if (address_family == AF_UNSPEC) address_family = AF_INET;
1124 s = p_socket(address_family, SOCK_STREAM, 0);
1127 if (s == INVALID_SOCKET) {
1128 err = p_WSAGetLastError();
1129 ret->error = winsock_error_string(err);
1130 return (Socket) ret;
1135 p_setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (const char *)&on, sizeof(on));
1138 if (address_family == AF_INET6) {
1139 memset(&a6, 0, sizeof(a6));
1140 a6.sin6_family = AF_INET6;
1141 /* FIXME: srcaddr is ignored for IPv6, because I (SGT) don't
1142 * know how to do it. :-)
1143 * (jeroen:) saddr is specified as an address.. eg 2001:db8::1
1144 * Thus we need either a parser that understands [2001:db8::1]:80
1145 * style addresses and/or enhance this to understand hostnames too. */
1146 if (local_host_only)
1147 a6.sin6_addr = in6addr_loopback;
1149 a6.sin6_addr = in6addr_any;
1150 a6.sin6_port = p_htons(port);
1155 a.sin_family = AF_INET;
1158 * Bind to source address. First try an explicitly
1162 a.sin_addr.s_addr = p_inet_addr(srcaddr);
1163 if (a.sin_addr.s_addr != INADDR_NONE) {
1164 /* Override localhost_only with specified listen addr. */
1165 ret->localhost_only = ipv4_is_loopback(a.sin_addr);
1171 * ... and failing that, go with one of the standard ones.
1174 if (local_host_only)
1175 a.sin_addr.s_addr = p_htonl(INADDR_LOOPBACK);
1177 a.sin_addr.s_addr = p_htonl(INADDR_ANY);
1180 a.sin_port = p_htons((short)port);
1183 retcode = p_bind(s, (address_family == AF_INET6 ?
1184 (struct sockaddr *) &a6 :
1185 (struct sockaddr *) &a),
1187 AF_INET6 ? sizeof(a6) : sizeof(a)));
1189 retcode = p_bind(s, (struct sockaddr *) &a, sizeof(a));
1191 if (retcode != SOCKET_ERROR) {
1194 err = p_WSAGetLastError();
1199 ret->error = winsock_error_string(err);
1200 return (Socket) ret;
1204 if (p_listen(s, SOMAXCONN) == SOCKET_ERROR) {
1206 ret->error = winsock_error_string(err);
1207 return (Socket) ret;
1210 /* Set up a select mechanism. This could be an AsyncSelect on a
1211 * window, or an EventSelect on an event object. */
1212 errstr = do_select(s, 1);
1215 ret->error = errstr;
1216 return (Socket) ret;
1219 add234(sktree, ret);
1223 * If we were given ADDRTYPE_UNSPEC, we must also create an
1224 * IPv6 listening socket and link it to this one.
1226 if (address_family == AF_INET && orig_address_family == ADDRTYPE_UNSPEC) {
1227 Actual_Socket other;
1229 other = (Actual_Socket) sk_newlistener(srcaddr, port, plug,
1230 local_host_only, ADDRTYPE_IPV6);
1233 if (!other->error) {
1234 other->parent = ret;
1243 return (Socket) ret;
1246 static void sk_tcp_close(Socket sock)
1248 extern char *do_select(SOCKET skt, int startup);
1249 Actual_Socket s = (Actual_Socket) sock;
1252 sk_tcp_close((Socket)s->child);
1256 p_closesocket(s->s);
1258 sk_addr_free(s->addr);
1263 * The function which tries to send on a socket once it's deemed
1266 void try_send(Actual_Socket s)
1268 while (s->sending_oob || bufchain_size(&s->output_data) > 0) {
1272 int len, urgentflag;
1274 if (s->sending_oob) {
1275 urgentflag = MSG_OOB;
1276 len = s->sending_oob;
1280 bufchain_prefix(&s->output_data, &data, &len);
1282 nsent = p_send(s->s, data, len, urgentflag);
1283 noise_ultralight(nsent);
1285 err = (nsent < 0 ? p_WSAGetLastError() : 0);
1286 if ((err < WSABASEERR && nsent < 0) || err == WSAEWOULDBLOCK) {
1288 * Perfectly normal: we've sent all we can for the moment.
1290 * (Some WinSock send() implementations can return
1291 * <0 but leave no sensible error indication -
1292 * WSAGetLastError() is called but returns zero or
1293 * a small number - so we check that case and treat
1294 * it just like WSAEWOULDBLOCK.)
1296 s->writable = FALSE;
1298 } else if (nsent == 0 ||
1299 err == WSAECONNABORTED || err == WSAECONNRESET) {
1301 * If send() returns CONNABORTED or CONNRESET, we
1302 * unfortunately can't just call plug_closing(),
1303 * because it's quite likely that we're currently
1304 * _in_ a call from the code we'd be calling back
1305 * to, so we'd have to make half the SSH code
1306 * reentrant. Instead we flag a pending error on
1307 * the socket, to be dealt with (by calling
1308 * plug_closing()) at some suitable future moment.
1310 s->pending_error = err;
1313 /* We're inside the Windows frontend here, so we know
1314 * that the frontend handle is unnecessary. */
1315 logevent(NULL, winsock_error_string(err));
1316 fatalbox("%s", winsock_error_string(err));
1319 if (s->sending_oob) {
1321 memmove(s->oobdata, s->oobdata+nsent, len-nsent);
1322 s->sending_oob = len - nsent;
1327 bufchain_consume(&s->output_data, nsent);
1333 static int sk_tcp_write(Socket sock, const char *buf, int len)
1335 Actual_Socket s = (Actual_Socket) sock;
1338 * Add the data to the buffer list on the socket.
1340 bufchain_add(&s->output_data, buf, len);
1343 * Now try sending from the start of the buffer list.
1348 return bufchain_size(&s->output_data);
1351 static int sk_tcp_write_oob(Socket sock, const char *buf, int len)
1353 Actual_Socket s = (Actual_Socket) sock;
1356 * Replace the buffer list on the socket with the data.
1358 bufchain_clear(&s->output_data);
1359 assert(len <= sizeof(s->oobdata));
1360 memcpy(s->oobdata, buf, len);
1361 s->sending_oob = len;
1364 * Now try sending from the start of the buffer list.
1369 return s->sending_oob;
1372 int select_result(WPARAM wParam, LPARAM lParam)
1376 char buf[20480]; /* nice big buffer for plenty of speed */
1380 /* wParam is the socket itself */
1383 return 1; /* boggle */
1385 s = find234(sktree, (void *) wParam, cmpforsearch);
1387 return 1; /* boggle */
1389 if ((err = WSAGETSELECTERROR(lParam)) != 0) {
1391 * An error has occurred on this socket. Pass it to the
1395 plug_log(s->plug, 1, s->addr, s->port,
1396 winsock_error_string(err), err);
1397 while (s->addr && sk_nextaddr(s->addr, &s->step)) {
1398 err = try_connect(s);
1402 return plug_closing(s->plug, winsock_error_string(err), err, 0);
1407 noise_ultralight(lParam);
1409 switch (WSAGETSELECTEVENT(lParam)) {
1411 s->connected = s->writable = 1;
1413 * Once a socket is connected, we can stop falling
1414 * back through the candidate addresses to connect
1418 sk_addr_free(s->addr);
1423 /* In the case the socket is still frozen, we don't even bother */
1425 s->frozen_readable = 1;
1430 * We have received data on the socket. For an oobinline
1431 * socket, this might be data _before_ an urgent pointer,
1432 * in which case we send it to the back end with type==1
1433 * (data prior to urgent).
1437 p_ioctlsocket(s->s, SIOCATMARK, &atmark);
1439 * Avoid checking the return value from ioctlsocket(),
1440 * on the grounds that some WinSock wrappers don't
1441 * support it. If it does nothing, we get atmark==1,
1442 * which is equivalent to `no OOB pending', so the
1443 * effect will be to non-OOB-ify any OOB data.
1448 ret = p_recv(s->s, buf, sizeof(buf), 0);
1449 noise_ultralight(ret);
1451 err = p_WSAGetLastError();
1452 if (err == WSAEWOULDBLOCK) {
1457 return plug_closing(s->plug, winsock_error_string(err), err,
1459 } else if (0 == ret) {
1460 return plug_closing(s->plug, NULL, 0, 0);
1462 return plug_receive(s->plug, atmark ? 0 : 1, buf, ret);
1467 * This will only happen on a non-oobinline socket. It
1468 * indicates that we can immediately perform an OOB read
1469 * and get back OOB data, which we will send to the back
1470 * end with type==2 (urgent data).
1472 ret = p_recv(s->s, buf, sizeof(buf), MSG_OOB);
1473 noise_ultralight(ret);
1475 char *str = (ret == 0 ? "Internal networking trouble" :
1476 winsock_error_string(p_WSAGetLastError()));
1477 /* We're inside the Windows frontend here, so we know
1478 * that the frontend handle is unnecessary. */
1479 logevent(NULL, str);
1480 fatalbox("%s", str);
1482 return plug_receive(s->plug, 2, buf, ret);
1487 int bufsize_before, bufsize_after;
1489 bufsize_before = s->sending_oob + bufchain_size(&s->output_data);
1491 bufsize_after = s->sending_oob + bufchain_size(&s->output_data);
1492 if (bufsize_after < bufsize_before)
1493 plug_sent(s->plug, bufsize_after);
1497 /* Signal a close on the socket. First read any outstanding data. */
1500 ret = p_recv(s->s, buf, sizeof(buf), 0);
1502 err = p_WSAGetLastError();
1503 if (err == WSAEWOULDBLOCK)
1505 return plug_closing(s->plug, winsock_error_string(err),
1509 open &= plug_receive(s->plug, 0, buf, ret);
1511 open &= plug_closing(s->plug, NULL, 0, 0);
1518 struct sockaddr_in isa;
1520 struct sockaddr_storage isa;
1522 int addrlen = sizeof(isa);
1523 SOCKET t; /* socket of connection */
1525 memset(&isa, 0, sizeof(isa));
1527 t = p_accept(s->s,(struct sockaddr *)&isa,&addrlen);
1528 if (t == INVALID_SOCKET)
1530 err = p_WSAGetLastError();
1531 if (err == WSATRY_AGAIN)
1535 if (isa.ss_family == AF_INET &&
1536 s->localhost_only &&
1537 !ipv4_is_local_addr(((struct sockaddr_in *)&isa)->sin_addr))
1539 if (s->localhost_only && !ipv4_is_local_addr(isa.sin_addr))
1542 p_closesocket(t); /* dodgy WinSock let nonlocal through */
1543 } else if (plug_accepting(s->plug, (void*)t)) {
1544 p_closesocket(t); /* denied or error */
1553 * Deal with socket errors detected in try_send().
1555 void net_pending_errors(void)
1561 * This might be a fiddly business, because it's just possible
1562 * that handling a pending error on one socket might cause
1563 * others to be closed. (I can't think of any reason this might
1564 * happen in current SSH implementation, but to maintain
1565 * generality of this network layer I'll assume the worst.)
1567 * So what we'll do is search the socket list for _one_ socket
1568 * with a pending error, and then handle it, and then search
1569 * the list again _from the beginning_. Repeat until we make a
1570 * pass with no socket errors present. That way we are
1571 * protected against the socket list changing under our feet.
1575 for (i = 0; (s = index234(sktree, i)) != NULL; i++) {
1576 if (s->pending_error) {
1578 * An error has occurred on this socket. Pass it to the
1581 plug_closing(s->plug,
1582 winsock_error_string(s->pending_error),
1583 s->pending_error, 0);
1591 * Each socket abstraction contains a `void *' private field in
1592 * which the client can keep state.
1594 static void sk_tcp_set_private_ptr(Socket sock, void *ptr)
1596 Actual_Socket s = (Actual_Socket) sock;
1597 s->private_ptr = ptr;
1600 static void *sk_tcp_get_private_ptr(Socket sock)
1602 Actual_Socket s = (Actual_Socket) sock;
1603 return s->private_ptr;
1607 * Special error values are returned from sk_namelookup and sk_new
1608 * if there's a problem. These functions extract an error message,
1609 * or return NULL if there's no problem.
1611 const char *sk_addr_error(SockAddr addr)
1615 static const char *sk_tcp_socket_error(Socket sock)
1617 Actual_Socket s = (Actual_Socket) sock;
1621 static void sk_tcp_set_frozen(Socket sock, int is_frozen)
1623 Actual_Socket s = (Actual_Socket) sock;
1624 if (s->frozen == is_frozen)
1626 s->frozen = is_frozen;
1629 if (s->frozen_readable) {
1631 p_recv(s->s, &c, 1, MSG_PEEK);
1634 s->frozen_readable = 0;
1637 void socket_reselect_all(void)
1642 for (i = 0; (s = index234(sktree, i)) != NULL; i++) {
1649 * For Plink: enumerate all sockets currently active.
1651 SOCKET first_socket(int *state)
1655 s = index234(sktree, (*state)++);
1656 return s ? s->s : INVALID_SOCKET;
1659 SOCKET next_socket(int *state)
1661 Actual_Socket s = index234(sktree, (*state)++);
1662 return s ? s->s : INVALID_SOCKET;
1665 extern int socket_writable(SOCKET skt)
1667 Actual_Socket s = find234(sktree, (void *)skt, cmpforsearch);
1670 return bufchain_size(&s->output_data) > 0;
1675 int net_service_lookup(char *service)
1678 se = p_getservbyname(service, NULL);
1680 return p_ntohs(se->s_port);
1685 SockAddr platform_get_x11_unix_address(const char *display, int displaynum,
1686 char **canonicalname)
1688 SockAddr ret = snew(struct SockAddr_tag);
1689 memset(ret, 0, sizeof(struct SockAddr_tag));
1690 ret->error = "unix sockets not supported on this platform";