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;
84 int namedpipe; /* indicates that this SockAddr is phony, holding a Windows
85 * named pipe pathname instead of a network address */
87 struct addrinfo *ais; /* Addresses IPv6 style. */
89 unsigned long *addresses; /* Addresses IPv4 style. */
91 char hostname[512]; /* Store an unresolved host name. */
95 * Which address family this address belongs to. AF_INET for IPv4;
96 * AF_INET6 for IPv6; AF_UNSPEC indicates that name resolution has
97 * not been done and a simple host name is held in this SockAddr
101 #define SOCKADDR_FAMILY(addr, step) \
102 (!(addr)->resolved ? AF_UNSPEC : \
103 (step).ai ? (step).ai->ai_family : AF_INET)
105 #define SOCKADDR_FAMILY(addr, step) \
106 (!(addr)->resolved ? AF_UNSPEC : AF_INET)
110 * Start a SockAddrStep structure to step through multiple
114 #define START_STEP(addr, step) \
115 ((step).ai = (addr)->ais, (step).curraddr = 0)
117 #define START_STEP(addr, step) \
118 ((step).curraddr = 0)
121 static tree234 *sktree;
123 static int cmpfortree(void *av, void *bv)
125 Actual_Socket a = (Actual_Socket) av, b = (Actual_Socket) bv;
126 unsigned long as = (unsigned long) a->s, bs = (unsigned long) b->s;
138 static int cmpforsearch(void *av, void *bv)
140 Actual_Socket b = (Actual_Socket) bv;
141 unsigned long as = (unsigned long) av, bs = (unsigned long) b->s;
149 DECL_WINDOWS_FUNCTION(static, int, WSAStartup, (WORD, LPWSADATA));
150 DECL_WINDOWS_FUNCTION(static, int, WSACleanup, (void));
151 DECL_WINDOWS_FUNCTION(static, int, closesocket, (SOCKET));
152 DECL_WINDOWS_FUNCTION(static, u_long, ntohl, (u_long));
153 DECL_WINDOWS_FUNCTION(static, u_long, htonl, (u_long));
154 DECL_WINDOWS_FUNCTION(static, u_short, htons, (u_short));
155 DECL_WINDOWS_FUNCTION(static, u_short, ntohs, (u_short));
156 DECL_WINDOWS_FUNCTION(static, int, gethostname, (char *, int));
157 DECL_WINDOWS_FUNCTION(static, struct hostent FAR *, gethostbyname,
159 DECL_WINDOWS_FUNCTION(static, struct servent FAR *, getservbyname,
160 (const char FAR *, const char FAR *));
161 DECL_WINDOWS_FUNCTION(static, unsigned long, inet_addr, (const char FAR *));
162 DECL_WINDOWS_FUNCTION(static, char FAR *, inet_ntoa, (struct in_addr));
163 DECL_WINDOWS_FUNCTION(static, int, connect,
164 (SOCKET, const struct sockaddr FAR *, int));
165 DECL_WINDOWS_FUNCTION(static, int, bind,
166 (SOCKET, const struct sockaddr FAR *, int));
167 DECL_WINDOWS_FUNCTION(static, int, setsockopt,
168 (SOCKET, int, int, const char FAR *, int));
169 DECL_WINDOWS_FUNCTION(static, SOCKET, socket, (int, int, int));
170 DECL_WINDOWS_FUNCTION(static, int, listen, (SOCKET, int));
171 DECL_WINDOWS_FUNCTION(static, int, send, (SOCKET, const char FAR *, int, int));
172 DECL_WINDOWS_FUNCTION(static, int, shutdown, (SOCKET, int));
173 DECL_WINDOWS_FUNCTION(static, int, ioctlsocket,
174 (SOCKET, long, u_long FAR *));
175 DECL_WINDOWS_FUNCTION(static, SOCKET, accept,
176 (SOCKET, struct sockaddr FAR *, int FAR *));
177 DECL_WINDOWS_FUNCTION(static, int, recv, (SOCKET, char FAR *, int, int));
178 DECL_WINDOWS_FUNCTION(static, int, WSAIoctl,
179 (SOCKET, DWORD, LPVOID, DWORD, LPVOID, DWORD,
180 LPDWORD, LPWSAOVERLAPPED,
181 LPWSAOVERLAPPED_COMPLETION_ROUTINE));
183 DECL_WINDOWS_FUNCTION(static, int, getaddrinfo,
184 (const char *nodename, const char *servname,
185 const struct addrinfo *hints, struct addrinfo **res));
186 DECL_WINDOWS_FUNCTION(static, void, freeaddrinfo, (struct addrinfo *res));
187 DECL_WINDOWS_FUNCTION(static, int, getnameinfo,
188 (const struct sockaddr FAR * sa, socklen_t salen,
189 char FAR * host, size_t hostlen, char FAR * serv,
190 size_t servlen, int flags));
191 DECL_WINDOWS_FUNCTION(static, char *, gai_strerror, (int ecode));
192 DECL_WINDOWS_FUNCTION(static, int, WSAAddressToStringA,
193 (LPSOCKADDR, DWORD, LPWSAPROTOCOL_INFO,
197 static HMODULE winsock_module = NULL;
198 static WSADATA wsadata;
200 static HMODULE winsock2_module = NULL;
201 static HMODULE wship6_module = NULL;
204 int sk_startup(int hi, int lo)
208 winsock_ver = MAKEWORD(hi, lo);
210 if (p_WSAStartup(winsock_ver, &wsadata)) {
214 if (LOBYTE(wsadata.wVersion) != LOBYTE(winsock_ver)) {
218 #ifdef NET_SETUP_DIAGNOSTICS
221 sprintf(buf, "Using WinSock %d.%d", hi, lo);
233 winsock_module = load_system32_dll("ws2_32.dll");
234 if (!winsock_module) {
235 winsock_module = load_system32_dll("wsock32.dll");
238 fatalbox("Unable to load any WinSock library");
241 /* Check if we have getaddrinfo in Winsock */
242 if (GetProcAddress(winsock_module, "getaddrinfo") != NULL) {
243 #ifdef NET_SETUP_DIAGNOSTICS
244 logevent(NULL, "Native WinSock IPv6 support detected");
246 GET_WINDOWS_FUNCTION(winsock_module, getaddrinfo);
247 GET_WINDOWS_FUNCTION(winsock_module, freeaddrinfo);
248 GET_WINDOWS_FUNCTION(winsock_module, getnameinfo);
249 GET_WINDOWS_FUNCTION(winsock_module, gai_strerror);
251 /* Fall back to wship6.dll for Windows 2000 */
252 wship6_module = load_system32_dll("wship6.dll");
254 #ifdef NET_SETUP_DIAGNOSTICS
255 logevent(NULL, "WSH IPv6 support detected");
257 GET_WINDOWS_FUNCTION(wship6_module, getaddrinfo);
258 GET_WINDOWS_FUNCTION(wship6_module, freeaddrinfo);
259 GET_WINDOWS_FUNCTION(wship6_module, getnameinfo);
260 GET_WINDOWS_FUNCTION(wship6_module, gai_strerror);
262 #ifdef NET_SETUP_DIAGNOSTICS
263 logevent(NULL, "No IPv6 support detected");
267 GET_WINDOWS_FUNCTION(winsock2_module, WSAAddressToStringA);
269 #ifdef NET_SETUP_DIAGNOSTICS
270 logevent(NULL, "PuTTY was built without IPv6 support");
274 GET_WINDOWS_FUNCTION(winsock_module, WSAAsyncSelect);
275 GET_WINDOWS_FUNCTION(winsock_module, WSAEventSelect);
276 GET_WINDOWS_FUNCTION(winsock_module, select);
277 GET_WINDOWS_FUNCTION(winsock_module, WSAGetLastError);
278 GET_WINDOWS_FUNCTION(winsock_module, WSAEnumNetworkEvents);
279 GET_WINDOWS_FUNCTION(winsock_module, WSAStartup);
280 GET_WINDOWS_FUNCTION(winsock_module, WSACleanup);
281 GET_WINDOWS_FUNCTION(winsock_module, closesocket);
282 GET_WINDOWS_FUNCTION(winsock_module, ntohl);
283 GET_WINDOWS_FUNCTION(winsock_module, htonl);
284 GET_WINDOWS_FUNCTION(winsock_module, htons);
285 GET_WINDOWS_FUNCTION(winsock_module, ntohs);
286 GET_WINDOWS_FUNCTION(winsock_module, gethostname);
287 GET_WINDOWS_FUNCTION(winsock_module, gethostbyname);
288 GET_WINDOWS_FUNCTION(winsock_module, getservbyname);
289 GET_WINDOWS_FUNCTION(winsock_module, inet_addr);
290 GET_WINDOWS_FUNCTION(winsock_module, inet_ntoa);
291 GET_WINDOWS_FUNCTION(winsock_module, connect);
292 GET_WINDOWS_FUNCTION(winsock_module, bind);
293 GET_WINDOWS_FUNCTION(winsock_module, setsockopt);
294 GET_WINDOWS_FUNCTION(winsock_module, socket);
295 GET_WINDOWS_FUNCTION(winsock_module, listen);
296 GET_WINDOWS_FUNCTION(winsock_module, send);
297 GET_WINDOWS_FUNCTION(winsock_module, shutdown);
298 GET_WINDOWS_FUNCTION(winsock_module, ioctlsocket);
299 GET_WINDOWS_FUNCTION(winsock_module, accept);
300 GET_WINDOWS_FUNCTION(winsock_module, recv);
301 GET_WINDOWS_FUNCTION(winsock_module, WSAIoctl);
303 /* Try to get the best WinSock version we can get */
304 if (!sk_startup(2,2) &&
307 fatalbox("Unable to initialise WinSock");
310 sktree = newtree234(cmpfortree);
313 void sk_cleanup(void)
319 for (i = 0; (s = index234(sktree, i)) != NULL; i++) {
329 FreeLibrary(winsock_module);
332 FreeLibrary(wship6_module);
341 static int errstring_find(void *av, void *bv)
344 struct errstring *b = (struct errstring *)bv;
351 static int errstring_compare(void *av, void *bv)
353 struct errstring *a = (struct errstring *)av;
354 return errstring_find(&a->error, bv);
357 static tree234 *errstrings = NULL;
359 char *winsock_error_string(int error)
361 const char prefix[] = "Network error: ";
362 struct errstring *es;
365 * Error codes we know about and have historically had reasonably
366 * sensible error messages for.
370 return "Network error: Permission denied";
372 return "Network error: Address already in use";
373 case WSAEADDRNOTAVAIL:
374 return "Network error: Cannot assign requested address";
375 case WSAEAFNOSUPPORT:
377 "Network error: Address family not supported by protocol family";
379 return "Network error: Operation already in progress";
380 case WSAECONNABORTED:
381 return "Network error: Software caused connection abort";
382 case WSAECONNREFUSED:
383 return "Network error: Connection refused";
385 return "Network error: Connection reset by peer";
386 case WSAEDESTADDRREQ:
387 return "Network error: Destination address required";
389 return "Network error: Bad address";
391 return "Network error: Host is down";
392 case WSAEHOSTUNREACH:
393 return "Network error: No route to host";
395 return "Network error: Operation now in progress";
397 return "Network error: Interrupted function call";
399 return "Network error: Invalid argument";
401 return "Network error: Socket is already connected";
403 return "Network error: Too many open files";
405 return "Network error: Message too long";
407 return "Network error: Network is down";
409 return "Network error: Network dropped connection on reset";
411 return "Network error: Network is unreachable";
413 return "Network error: No buffer space available";
415 return "Network error: Bad protocol option";
417 return "Network error: Socket is not connected";
419 return "Network error: Socket operation on non-socket";
421 return "Network error: Operation not supported";
422 case WSAEPFNOSUPPORT:
423 return "Network error: Protocol family not supported";
425 return "Network error: Too many processes";
426 case WSAEPROTONOSUPPORT:
427 return "Network error: Protocol not supported";
429 return "Network error: Protocol wrong type for socket";
431 return "Network error: Cannot send after socket shutdown";
432 case WSAESOCKTNOSUPPORT:
433 return "Network error: Socket type not supported";
435 return "Network error: Connection timed out";
437 return "Network error: Resource temporarily unavailable";
439 return "Network error: Graceful shutdown in progress";
443 * Generic code to handle any other error.
445 * Slightly nasty hack here: we want to return a static string
446 * which the caller will never have to worry about freeing, but on
447 * the other hand if we call FormatMessage to get it then it will
448 * want to either allocate a buffer or write into one we own.
450 * So what we do is to maintain a tree234 of error strings we've
451 * already used. New ones are allocated from the heap, but then
452 * put in this tree and kept forever.
456 errstrings = newtree234(errstring_compare);
458 es = find234(errstrings, &error, errstring_find);
461 int bufsize, bufused;
463 es = snew(struct errstring);
465 /* maximum size for FormatMessage is 64K */
466 bufsize = 65535 + sizeof(prefix);
467 es->text = snewn(bufsize, char);
468 strcpy(es->text, prefix);
469 bufused = strlen(es->text);
470 if (!FormatMessage((FORMAT_MESSAGE_FROM_SYSTEM |
471 FORMAT_MESSAGE_IGNORE_INSERTS), NULL, error,
472 MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
473 es->text + bufused, bufsize - bufused, NULL)) {
474 sprintf(es->text + bufused,
475 "Windows error code %d (and FormatMessage returned %d)",
476 error, GetLastError());
478 int len = strlen(es->text);
479 if (len > 0 && es->text[len-1] == '\n')
480 es->text[len-1] = '\0';
482 es->text = sresize(es->text, strlen(es->text) + 1, char);
483 add234(errstrings, es);
489 SockAddr sk_namelookup(const char *host, char **canonicalname,
492 SockAddr ret = snew(struct SockAddr_tag);
497 /* Default to IPv4. */
498 hint_family = (address_family == ADDRTYPE_IPV4 ? AF_INET :
500 address_family == ADDRTYPE_IPV6 ? AF_INET6 :
504 /* Clear the structure and default to IPv4. */
505 memset(ret, 0, sizeof(struct SockAddr_tag));
509 ret->namedpipe = FALSE;
510 ret->addresses = NULL;
511 ret->resolved = FALSE;
515 if ((a = p_inet_addr(host)) == (unsigned long) INADDR_NONE) {
516 struct hostent *h = NULL;
520 * Use getaddrinfo when it's available
523 struct addrinfo hints;
524 #ifdef NET_SETUP_DIAGNOSTICS
525 logevent(NULL, "Using getaddrinfo() for resolving");
527 memset(&hints, 0, sizeof(hints));
528 hints.ai_family = hint_family;
529 hints.ai_flags = AI_CANONNAME;
530 if ((err = p_getaddrinfo(host, NULL, &hints, &ret->ais)) == 0)
531 ret->resolved = TRUE;
535 #ifdef NET_SETUP_DIAGNOSTICS
536 logevent(NULL, "Using gethostbyname() for resolving");
539 * Otherwise use the IPv4-only gethostbyname...
540 * (NOTE: we don't use gethostbyname as a fallback!)
542 if ( (h = p_gethostbyname(host)) )
543 ret->resolved = TRUE;
545 err = p_WSAGetLastError();
548 if (!ret->resolved) {
549 ret->error = (err == WSAENETDOWN ? "Network is down" :
550 err == WSAHOST_NOT_FOUND ? "Host does not exist" :
551 err == WSATRY_AGAIN ? "Host not found" :
553 p_getaddrinfo&&p_gai_strerror ? p_gai_strerror(err) :
555 "gethostbyname: unknown error");
560 /* If we got an address info use that... */
562 /* Are we in IPv4 fallback mode? */
563 /* We put the IPv4 address into the a variable so we can further-on use the IPv4 code... */
564 if (ret->ais->ai_family == AF_INET)
566 (char *) &((SOCKADDR_IN *) ret->ais->
567 ai_addr)->sin_addr, sizeof(a));
569 if (ret->ais->ai_canonname)
570 strncpy(realhost, ret->ais->ai_canonname, lenof(realhost));
572 strncpy(realhost, host, lenof(realhost));
574 /* We used the IPv4-only gethostbyname()... */
579 for (n = 0; h->h_addr_list[n]; n++);
580 ret->addresses = snewn(n, unsigned long);
582 for (n = 0; n < ret->naddresses; n++) {
583 memcpy(&a, h->h_addr_list[n], sizeof(a));
584 ret->addresses[n] = p_ntohl(a);
586 memcpy(&a, h->h_addr, sizeof(a));
587 /* This way we are always sure the h->h_name is valid :) */
588 strncpy(realhost, h->h_name, sizeof(realhost));
593 * This must be a numeric IPv4 address because it caused a
594 * success return from inet_addr.
596 ret->addresses = snewn(1, unsigned long);
598 ret->addresses[0] = p_ntohl(a);
599 ret->resolved = TRUE;
600 strncpy(realhost, host, sizeof(realhost));
602 realhost[lenof(realhost)-1] = '\0';
603 *canonicalname = snewn(1+strlen(realhost), char);
604 strcpy(*canonicalname, realhost);
608 SockAddr sk_nonamelookup(const char *host)
610 SockAddr ret = snew(struct SockAddr_tag);
612 ret->resolved = FALSE;
616 ret->namedpipe = FALSE;
617 ret->addresses = NULL;
620 strncpy(ret->hostname, host, lenof(ret->hostname));
621 ret->hostname[lenof(ret->hostname)-1] = '\0';
625 SockAddr sk_namedpipe_addr(const char *pipename)
627 SockAddr ret = snew(struct SockAddr_tag);
629 ret->resolved = FALSE;
633 ret->namedpipe = TRUE;
634 ret->addresses = NULL;
637 strncpy(ret->hostname, pipename, lenof(ret->hostname));
638 ret->hostname[lenof(ret->hostname)-1] = '\0';
642 int sk_nextaddr(SockAddr addr, SockAddrStep *step)
646 if (step->ai->ai_next) {
647 step->ai = step->ai->ai_next;
653 if (step->curraddr+1 < addr->naddresses) {
661 void sk_getaddr(SockAddr addr, char *buf, int buflen)
664 START_STEP(addr, step);
669 if (p_WSAAddressToStringA) {
670 DWORD dwbuflen = buflen;
671 err = p_WSAAddressToStringA(step.ai->ai_addr, step.ai->ai_addrlen,
672 NULL, buf, &dwbuflen);
676 strncpy(buf, addr->hostname, buflen);
678 strncpy(buf, "<unknown>", buflen);
679 buf[buflen-1] = '\0';
683 if (SOCKADDR_FAMILY(addr, step) == AF_INET) {
685 assert(addr->addresses && step.curraddr < addr->naddresses);
686 a.s_addr = p_htonl(addr->addresses[step.curraddr]);
687 strncpy(buf, p_inet_ntoa(a), buflen);
688 buf[buflen-1] = '\0';
690 strncpy(buf, addr->hostname, buflen);
691 buf[buflen-1] = '\0';
695 int sk_addr_needs_port(SockAddr addr)
697 return addr->namedpipe ? FALSE : TRUE;
700 int sk_hostname_is_local(const char *name)
702 return !strcmp(name, "localhost") ||
703 !strcmp(name, "::1") ||
704 !strncmp(name, "127.", 4);
707 static INTERFACE_INFO local_interfaces[16];
708 static int n_local_interfaces; /* 0=not yet, -1=failed, >0=number */
710 static int ipv4_is_local_addr(struct in_addr addr)
712 if (ipv4_is_loopback(addr))
713 return 1; /* loopback addresses are local */
714 if (!n_local_interfaces) {
715 SOCKET s = p_socket(AF_INET, SOCK_DGRAM, 0);
719 p_WSAIoctl(s, SIO_GET_INTERFACE_LIST, NULL, 0,
720 local_interfaces, sizeof(local_interfaces),
721 &retbytes, NULL, NULL) == 0)
722 n_local_interfaces = retbytes / sizeof(INTERFACE_INFO);
724 logevent(NULL, "Unable to get list of local IP addresses");
726 if (n_local_interfaces > 0) {
728 for (i = 0; i < n_local_interfaces; i++) {
729 SOCKADDR_IN *address =
730 (SOCKADDR_IN *)&local_interfaces[i].iiAddress;
731 if (address->sin_addr.s_addr == addr.s_addr)
732 return 1; /* this address is local */
735 return 0; /* this address is not local */
738 int sk_address_is_local(SockAddr addr)
742 START_STEP(addr, step);
743 family = SOCKADDR_FAMILY(addr, step);
746 if (family == AF_INET6) {
747 return IN6_IS_ADDR_LOOPBACK(&((const struct sockaddr_in6 *)step.ai->ai_addr)->sin6_addr);
750 if (family == AF_INET) {
753 return ipv4_is_local_addr(((struct sockaddr_in *)step.ai->ai_addr)
759 assert(addr->addresses && step.curraddr < addr->naddresses);
760 a.s_addr = p_htonl(addr->addresses[step.curraddr]);
761 return ipv4_is_local_addr(a);
764 assert(family == AF_UNSPEC);
765 return 0; /* we don't know; assume not */
769 int sk_address_is_special_local(SockAddr addr)
771 return 0; /* no Unix-domain socket analogue here */
774 int sk_addrtype(SockAddr addr)
778 START_STEP(addr, step);
779 family = SOCKADDR_FAMILY(addr, step);
781 return (family == AF_INET ? ADDRTYPE_IPV4 :
783 family == AF_INET6 ? ADDRTYPE_IPV6 :
788 void sk_addrcopy(SockAddr addr, char *buf)
792 START_STEP(addr, step);
793 family = SOCKADDR_FAMILY(addr, step);
795 assert(family != AF_UNSPEC);
798 if (family == AF_INET)
799 memcpy(buf, &((struct sockaddr_in *)step.ai->ai_addr)->sin_addr,
800 sizeof(struct in_addr));
801 else if (family == AF_INET6)
802 memcpy(buf, &((struct sockaddr_in6 *)step.ai->ai_addr)->sin6_addr,
803 sizeof(struct in6_addr));
808 if (family == AF_INET) {
810 assert(addr->addresses && step.curraddr < addr->naddresses);
811 a.s_addr = p_htonl(addr->addresses[step.curraddr]);
812 memcpy(buf, (char*) &a.s_addr, 4);
816 void sk_addr_free(SockAddr addr)
818 if (--addr->refcount > 0)
821 if (addr->ais && p_freeaddrinfo)
822 p_freeaddrinfo(addr->ais);
825 sfree(addr->addresses);
829 SockAddr sk_addr_dup(SockAddr addr)
835 static Plug sk_tcp_plug(Socket sock, Plug p)
837 Actual_Socket s = (Actual_Socket) sock;
844 static void sk_tcp_flush(Socket s)
847 * We send data to the socket as soon as we can anyway,
848 * so we don't need to do anything here. :-)
852 static void sk_tcp_close(Socket s);
853 static int sk_tcp_write(Socket s, const char *data, int len);
854 static int sk_tcp_write_oob(Socket s, const char *data, int len);
855 static void sk_tcp_write_eof(Socket s);
856 static void sk_tcp_set_frozen(Socket s, int is_frozen);
857 static const char *sk_tcp_socket_error(Socket s);
859 extern char *do_select(SOCKET skt, int startup);
861 static Socket sk_tcp_accept(accept_ctx_t ctx, Plug plug)
863 static const struct socket_function_table fn_table = {
879 * Create Socket structure.
881 ret = snew(struct Socket_tag);
885 bufchain_init(&ret->output_data);
886 ret->writable = 1; /* to start with */
887 ret->sending_oob = 0;
888 ret->outgoingeof = EOF_NO;
890 ret->frozen_readable = 0;
891 ret->localhost_only = 0; /* unused, but best init anyway */
892 ret->pending_error = 0;
893 ret->parent = ret->child = NULL;
896 ret->s = (SOCKET)ctx.p;
898 if (ret->s == INVALID_SOCKET) {
899 err = p_WSAGetLastError();
900 ret->error = winsock_error_string(err);
906 /* Set up a select mechanism. This could be an AsyncSelect on a
907 * window, or an EventSelect on an event object. */
908 errstr = do_select(ret->s, 1);
919 static DWORD try_connect(Actual_Socket sock)
931 if (sock->s != INVALID_SOCKET) {
932 do_select(sock->s, 0);
933 p_closesocket(sock->s);
936 plug_log(sock->plug, 0, sock->addr, sock->port, NULL, 0);
941 family = SOCKADDR_FAMILY(sock->addr, sock->step);
944 * Remove the socket from the tree before we overwrite its
945 * internal socket id, because that forms part of the tree's
946 * sorting criterion. We'll add it back before exiting this
947 * function, whether we changed anything or not.
949 del234(sktree, sock);
951 s = p_socket(family, SOCK_STREAM, 0);
954 if (s == INVALID_SOCKET) {
955 err = p_WSAGetLastError();
956 sock->error = winsock_error_string(err);
960 if (sock->oobinline) {
962 p_setsockopt(s, SOL_SOCKET, SO_OOBINLINE, (void *) &b, sizeof(b));
967 p_setsockopt(s, IPPROTO_TCP, TCP_NODELAY, (void *) &b, sizeof(b));
970 if (sock->keepalive) {
972 p_setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, (void *) &b, sizeof(b));
976 * Bind to local address.
979 localport = 1023; /* count from 1023 downwards */
981 localport = 0; /* just use port 0 (ie winsock picks) */
983 /* Loop round trying to bind */
988 if (family == AF_INET6) {
989 memset(&a6, 0, sizeof(a6));
990 a6.sin6_family = AF_INET6;
991 /*a6.sin6_addr = in6addr_any; */ /* == 0 done by memset() */
992 a6.sin6_port = p_htons(localport);
996 a.sin_family = AF_INET;
997 a.sin_addr.s_addr = p_htonl(INADDR_ANY);
998 a.sin_port = p_htons(localport);
1001 sockcode = p_bind(s, (family == AF_INET6 ?
1002 (struct sockaddr *) &a6 :
1003 (struct sockaddr *) &a),
1004 (family == AF_INET6 ? sizeof(a6) : sizeof(a)));
1006 sockcode = p_bind(s, (struct sockaddr *) &a, sizeof(a));
1008 if (sockcode != SOCKET_ERROR) {
1012 err = p_WSAGetLastError();
1013 if (err != WSAEADDRINUSE) /* failed, for a bad reason */
1018 break; /* we're only looping once */
1021 break; /* we might have got to the end */
1025 sock->error = winsock_error_string(err);
1030 * Connect to remote address.
1033 if (sock->step.ai) {
1034 if (family == AF_INET6) {
1035 a6.sin6_family = AF_INET6;
1036 a6.sin6_port = p_htons((short) sock->port);
1038 ((struct sockaddr_in6 *) sock->step.ai->ai_addr)->sin6_addr;
1039 a6.sin6_flowinfo = ((struct sockaddr_in6 *) sock->step.ai->ai_addr)->sin6_flowinfo;
1040 a6.sin6_scope_id = ((struct sockaddr_in6 *) sock->step.ai->ai_addr)->sin6_scope_id;
1042 a.sin_family = AF_INET;
1044 ((struct sockaddr_in *) sock->step.ai->ai_addr)->sin_addr;
1045 a.sin_port = p_htons((short) sock->port);
1050 assert(sock->addr->addresses && sock->step.curraddr < sock->addr->naddresses);
1051 a.sin_family = AF_INET;
1052 a.sin_addr.s_addr = p_htonl(sock->addr->addresses[sock->step.curraddr]);
1053 a.sin_port = p_htons((short) sock->port);
1056 /* Set up a select mechanism. This could be an AsyncSelect on a
1057 * window, or an EventSelect on an event object. */
1058 errstr = do_select(s, 1);
1060 sock->error = errstr;
1068 ((family == AF_INET6) ? (struct sockaddr *) &a6 :
1069 (struct sockaddr *) &a),
1070 (family == AF_INET6) ? sizeof(a6) : sizeof(a))
1072 p_connect(s, (struct sockaddr *) &a, sizeof(a))
1074 ) == SOCKET_ERROR) {
1075 err = p_WSAGetLastError();
1077 * We expect a potential EWOULDBLOCK here, because the
1078 * chances are the front end has done a select for
1079 * FD_CONNECT, so that connect() will complete
1082 if ( err != WSAEWOULDBLOCK ) {
1083 sock->error = winsock_error_string(err);
1088 * If we _don't_ get EWOULDBLOCK, the connect has completed
1089 * and we should set the socket as writable.
1099 * No matter what happened, put the socket back in the tree.
1101 add234(sktree, sock);
1104 plug_log(sock->plug, 1, sock->addr, sock->port, sock->error, err);
1108 Socket sk_new(SockAddr addr, int port, int privport, int oobinline,
1109 int nodelay, int keepalive, Plug plug)
1111 static const struct socket_function_table fn_table = {
1126 * Create Socket structure.
1128 ret = snew(struct Socket_tag);
1129 ret->fn = &fn_table;
1132 bufchain_init(&ret->output_data);
1133 ret->connected = 0; /* to start with */
1134 ret->writable = 0; /* to start with */
1135 ret->sending_oob = 0;
1136 ret->outgoingeof = EOF_NO;
1138 ret->frozen_readable = 0;
1139 ret->localhost_only = 0; /* unused, but best init anyway */
1140 ret->pending_error = 0;
1141 ret->parent = ret->child = NULL;
1142 ret->oobinline = oobinline;
1143 ret->nodelay = nodelay;
1144 ret->keepalive = keepalive;
1145 ret->privport = privport;
1148 START_STEP(ret->addr, ret->step);
1149 ret->s = INVALID_SOCKET;
1153 err = try_connect(ret);
1154 } while (err && sk_nextaddr(ret->addr, &ret->step));
1156 return (Socket) ret;
1159 Socket sk_newlistener(char *srcaddr, int port, Plug plug, int local_host_only,
1160 int orig_address_family)
1162 static const struct socket_function_table fn_table = {
1188 * Create Socket structure.
1190 ret = snew(struct Socket_tag);
1191 ret->fn = &fn_table;
1194 bufchain_init(&ret->output_data);
1195 ret->writable = 0; /* to start with */
1196 ret->sending_oob = 0;
1197 ret->outgoingeof = EOF_NO;
1199 ret->frozen_readable = 0;
1200 ret->localhost_only = local_host_only;
1201 ret->pending_error = 0;
1202 ret->parent = ret->child = NULL;
1206 * Translate address_family from platform-independent constants
1207 * into local reality.
1209 address_family = (orig_address_family == ADDRTYPE_IPV4 ? AF_INET :
1211 orig_address_family == ADDRTYPE_IPV6 ? AF_INET6 :
1216 * Our default, if passed the `don't care' value
1217 * ADDRTYPE_UNSPEC, is to listen on IPv4. If IPv6 is supported,
1218 * we will also set up a second socket listening on IPv6, but
1219 * the v4 one is primary since that ought to work even on
1220 * non-v6-supporting systems.
1222 if (address_family == AF_UNSPEC) address_family = AF_INET;
1227 s = p_socket(address_family, SOCK_STREAM, 0);
1230 if (s == INVALID_SOCKET) {
1231 err = p_WSAGetLastError();
1232 ret->error = winsock_error_string(err);
1233 return (Socket) ret;
1238 p_setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (const char *)&on, sizeof(on));
1241 if (address_family == AF_INET6) {
1242 memset(&a6, 0, sizeof(a6));
1243 a6.sin6_family = AF_INET6;
1244 /* FIXME: srcaddr is ignored for IPv6, because I (SGT) don't
1245 * know how to do it. :-)
1246 * (jeroen:) saddr is specified as an address.. eg 2001:db8::1
1247 * Thus we need either a parser that understands [2001:db8::1]:80
1248 * style addresses and/or enhance this to understand hostnames too. */
1249 if (local_host_only)
1250 a6.sin6_addr = in6addr_loopback;
1252 a6.sin6_addr = in6addr_any;
1253 a6.sin6_port = p_htons(port);
1258 a.sin_family = AF_INET;
1261 * Bind to source address. First try an explicitly
1265 a.sin_addr.s_addr = p_inet_addr(srcaddr);
1266 if (a.sin_addr.s_addr != INADDR_NONE) {
1267 /* Override localhost_only with specified listen addr. */
1268 ret->localhost_only = ipv4_is_loopback(a.sin_addr);
1274 * ... and failing that, go with one of the standard ones.
1277 if (local_host_only)
1278 a.sin_addr.s_addr = p_htonl(INADDR_LOOPBACK);
1280 a.sin_addr.s_addr = p_htonl(INADDR_ANY);
1283 a.sin_port = p_htons((short)port);
1286 retcode = p_bind(s, (address_family == AF_INET6 ?
1287 (struct sockaddr *) &a6 :
1288 (struct sockaddr *) &a),
1290 AF_INET6 ? sizeof(a6) : sizeof(a)));
1292 retcode = p_bind(s, (struct sockaddr *) &a, sizeof(a));
1294 if (retcode != SOCKET_ERROR) {
1297 err = p_WSAGetLastError();
1302 ret->error = winsock_error_string(err);
1303 return (Socket) ret;
1307 if (p_listen(s, SOMAXCONN) == SOCKET_ERROR) {
1309 ret->error = winsock_error_string(p_WSAGetLastError());
1310 return (Socket) ret;
1313 /* Set up a select mechanism. This could be an AsyncSelect on a
1314 * window, or an EventSelect on an event object. */
1315 errstr = do_select(s, 1);
1318 ret->error = errstr;
1319 return (Socket) ret;
1322 add234(sktree, ret);
1326 * If we were given ADDRTYPE_UNSPEC, we must also create an
1327 * IPv6 listening socket and link it to this one.
1329 if (address_family == AF_INET && orig_address_family == ADDRTYPE_UNSPEC) {
1330 Actual_Socket other;
1332 other = (Actual_Socket) sk_newlistener(srcaddr, port, plug,
1333 local_host_only, ADDRTYPE_IPV6);
1336 if (!other->error) {
1337 other->parent = ret;
1346 return (Socket) ret;
1349 static void sk_tcp_close(Socket sock)
1351 extern char *do_select(SOCKET skt, int startup);
1352 Actual_Socket s = (Actual_Socket) sock;
1355 sk_tcp_close((Socket)s->child);
1359 p_closesocket(s->s);
1361 sk_addr_free(s->addr);
1366 * Deal with socket errors detected in try_send().
1368 static void socket_error_callback(void *vs)
1370 Actual_Socket s = (Actual_Socket)vs;
1373 * Just in case other socket work has caused this socket to vanish
1374 * or become somehow non-erroneous before this callback arrived...
1376 if (!find234(sktree, s, NULL) || !s->pending_error)
1380 * An error has occurred on this socket. Pass it to the plug.
1382 plug_closing(s->plug, winsock_error_string(s->pending_error),
1383 s->pending_error, 0);
1387 * The function which tries to send on a socket once it's deemed
1390 void try_send(Actual_Socket s)
1392 while (s->sending_oob || bufchain_size(&s->output_data) > 0) {
1396 int len, urgentflag;
1398 if (s->sending_oob) {
1399 urgentflag = MSG_OOB;
1400 len = s->sending_oob;
1404 bufchain_prefix(&s->output_data, &data, &len);
1406 nsent = p_send(s->s, data, len, urgentflag);
1407 noise_ultralight(nsent);
1409 err = (nsent < 0 ? p_WSAGetLastError() : 0);
1410 if ((err < WSABASEERR && nsent < 0) || err == WSAEWOULDBLOCK) {
1412 * Perfectly normal: we've sent all we can for the moment.
1414 * (Some WinSock send() implementations can return
1415 * <0 but leave no sensible error indication -
1416 * WSAGetLastError() is called but returns zero or
1417 * a small number - so we check that case and treat
1418 * it just like WSAEWOULDBLOCK.)
1420 s->writable = FALSE;
1422 } else if (nsent == 0 ||
1423 err == WSAECONNABORTED || err == WSAECONNRESET) {
1425 * If send() returns CONNABORTED or CONNRESET, we
1426 * unfortunately can't just call plug_closing(),
1427 * because it's quite likely that we're currently
1428 * _in_ a call from the code we'd be calling back
1429 * to, so we'd have to make half the SSH code
1430 * reentrant. Instead we flag a pending error on
1431 * the socket, to be dealt with (by calling
1432 * plug_closing()) at some suitable future moment.
1434 s->pending_error = err;
1435 queue_toplevel_callback(socket_error_callback, s);
1438 /* We're inside the Windows frontend here, so we know
1439 * that the frontend handle is unnecessary. */
1440 logevent(NULL, winsock_error_string(err));
1441 fatalbox("%s", winsock_error_string(err));
1444 if (s->sending_oob) {
1446 memmove(s->oobdata, s->oobdata+nsent, len-nsent);
1447 s->sending_oob = len - nsent;
1452 bufchain_consume(&s->output_data, nsent);
1458 * If we reach here, we've finished sending everything we might
1459 * have needed to send. Send EOF, if we need to.
1461 if (s->outgoingeof == EOF_PENDING) {
1462 p_shutdown(s->s, SD_SEND);
1463 s->outgoingeof = EOF_SENT;
1467 static int sk_tcp_write(Socket sock, const char *buf, int len)
1469 Actual_Socket s = (Actual_Socket) sock;
1471 assert(s->outgoingeof == EOF_NO);
1474 * Add the data to the buffer list on the socket.
1476 bufchain_add(&s->output_data, buf, len);
1479 * Now try sending from the start of the buffer list.
1484 return bufchain_size(&s->output_data);
1487 static int sk_tcp_write_oob(Socket sock, const char *buf, int len)
1489 Actual_Socket s = (Actual_Socket) sock;
1491 assert(s->outgoingeof == EOF_NO);
1494 * Replace the buffer list on the socket with the data.
1496 bufchain_clear(&s->output_data);
1497 assert(len <= sizeof(s->oobdata));
1498 memcpy(s->oobdata, buf, len);
1499 s->sending_oob = len;
1502 * Now try sending from the start of the buffer list.
1507 return s->sending_oob;
1510 static void sk_tcp_write_eof(Socket sock)
1512 Actual_Socket s = (Actual_Socket) sock;
1514 assert(s->outgoingeof == EOF_NO);
1517 * Mark the socket as pending outgoing EOF.
1519 s->outgoingeof = EOF_PENDING;
1522 * Now try sending from the start of the buffer list.
1528 int select_result(WPARAM wParam, LPARAM lParam)
1532 char buf[20480]; /* nice big buffer for plenty of speed */
1536 /* wParam is the socket itself */
1539 return 1; /* boggle */
1541 s = find234(sktree, (void *) wParam, cmpforsearch);
1543 return 1; /* boggle */
1545 if ((err = WSAGETSELECTERROR(lParam)) != 0) {
1547 * An error has occurred on this socket. Pass it to the
1551 plug_log(s->plug, 1, s->addr, s->port,
1552 winsock_error_string(err), err);
1553 while (s->addr && sk_nextaddr(s->addr, &s->step)) {
1554 err = try_connect(s);
1558 return plug_closing(s->plug, winsock_error_string(err), err, 0);
1563 noise_ultralight(lParam);
1565 switch (WSAGETSELECTEVENT(lParam)) {
1567 s->connected = s->writable = 1;
1569 * Once a socket is connected, we can stop falling
1570 * back through the candidate addresses to connect
1574 sk_addr_free(s->addr);
1579 /* In the case the socket is still frozen, we don't even bother */
1581 s->frozen_readable = 1;
1586 * We have received data on the socket. For an oobinline
1587 * socket, this might be data _before_ an urgent pointer,
1588 * in which case we send it to the back end with type==1
1589 * (data prior to urgent).
1593 p_ioctlsocket(s->s, SIOCATMARK, &atmark);
1595 * Avoid checking the return value from ioctlsocket(),
1596 * on the grounds that some WinSock wrappers don't
1597 * support it. If it does nothing, we get atmark==1,
1598 * which is equivalent to `no OOB pending', so the
1599 * effect will be to non-OOB-ify any OOB data.
1604 ret = p_recv(s->s, buf, sizeof(buf), 0);
1605 noise_ultralight(ret);
1607 err = p_WSAGetLastError();
1608 if (err == WSAEWOULDBLOCK) {
1613 return plug_closing(s->plug, winsock_error_string(err), err,
1615 } else if (0 == ret) {
1616 return plug_closing(s->plug, NULL, 0, 0);
1618 return plug_receive(s->plug, atmark ? 0 : 1, buf, ret);
1623 * This will only happen on a non-oobinline socket. It
1624 * indicates that we can immediately perform an OOB read
1625 * and get back OOB data, which we will send to the back
1626 * end with type==2 (urgent data).
1628 ret = p_recv(s->s, buf, sizeof(buf), MSG_OOB);
1629 noise_ultralight(ret);
1631 char *str = (ret == 0 ? "Internal networking trouble" :
1632 winsock_error_string(p_WSAGetLastError()));
1633 /* We're inside the Windows frontend here, so we know
1634 * that the frontend handle is unnecessary. */
1635 logevent(NULL, str);
1636 fatalbox("%s", str);
1638 return plug_receive(s->plug, 2, buf, ret);
1643 int bufsize_before, bufsize_after;
1645 bufsize_before = s->sending_oob + bufchain_size(&s->output_data);
1647 bufsize_after = s->sending_oob + bufchain_size(&s->output_data);
1648 if (bufsize_after < bufsize_before)
1649 plug_sent(s->plug, bufsize_after);
1653 /* Signal a close on the socket. First read any outstanding data. */
1656 ret = p_recv(s->s, buf, sizeof(buf), 0);
1658 err = p_WSAGetLastError();
1659 if (err == WSAEWOULDBLOCK)
1661 return plug_closing(s->plug, winsock_error_string(err),
1665 open &= plug_receive(s->plug, 0, buf, ret);
1667 open &= plug_closing(s->plug, NULL, 0, 0);
1674 struct sockaddr_in isa;
1676 struct sockaddr_storage isa;
1678 int addrlen = sizeof(isa);
1679 SOCKET t; /* socket of connection */
1682 memset(&isa, 0, sizeof(isa));
1684 t = p_accept(s->s,(struct sockaddr *)&isa,&addrlen);
1685 if (t == INVALID_SOCKET)
1687 err = p_WSAGetLastError();
1688 if (err == WSATRY_AGAIN)
1695 if (isa.ss_family == AF_INET &&
1696 s->localhost_only &&
1697 !ipv4_is_local_addr(((struct sockaddr_in *)&isa)->sin_addr))
1699 if (s->localhost_only && !ipv4_is_local_addr(isa.sin_addr))
1702 p_closesocket(t); /* dodgy WinSock let nonlocal through */
1703 } else if (plug_accepting(s->plug, sk_tcp_accept, actx)) {
1704 p_closesocket(t); /* denied or error */
1713 * Special error values are returned from sk_namelookup and sk_new
1714 * if there's a problem. These functions extract an error message,
1715 * or return NULL if there's no problem.
1717 const char *sk_addr_error(SockAddr addr)
1721 static const char *sk_tcp_socket_error(Socket sock)
1723 Actual_Socket s = (Actual_Socket) sock;
1727 static void sk_tcp_set_frozen(Socket sock, int is_frozen)
1729 Actual_Socket s = (Actual_Socket) sock;
1730 if (s->frozen == is_frozen)
1732 s->frozen = is_frozen;
1735 if (s->frozen_readable) {
1737 p_recv(s->s, &c, 1, MSG_PEEK);
1740 s->frozen_readable = 0;
1743 void socket_reselect_all(void)
1748 for (i = 0; (s = index234(sktree, i)) != NULL; i++) {
1755 * For Plink: enumerate all sockets currently active.
1757 SOCKET first_socket(int *state)
1761 s = index234(sktree, (*state)++);
1762 return s ? s->s : INVALID_SOCKET;
1765 SOCKET next_socket(int *state)
1767 Actual_Socket s = index234(sktree, (*state)++);
1768 return s ? s->s : INVALID_SOCKET;
1771 extern int socket_writable(SOCKET skt)
1773 Actual_Socket s = find234(sktree, (void *)skt, cmpforsearch);
1776 return bufchain_size(&s->output_data) > 0;
1781 int net_service_lookup(char *service)
1784 se = p_getservbyname(service, NULL);
1786 return p_ntohs(se->s_port);
1791 char *get_hostname(void)
1794 char *hostname = NULL;
1797 hostname = sresize(hostname, len, char);
1798 if (p_gethostname(hostname, len) < 0) {
1803 } while (strlen(hostname) >= (size_t)(len-1));
1807 SockAddr platform_get_x11_unix_address(const char *display, int displaynum,
1808 char **canonicalname)
1810 SockAddr ret = snew(struct SockAddr_tag);
1811 memset(ret, 0, sizeof(struct SockAddr_tag));
1812 ret->error = "unix sockets not supported on this platform";