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;
84 struct addrinfo *ais; /* Addresses IPv6 style. */
86 unsigned long *addresses; /* Addresses IPv4 style. */
88 char hostname[512]; /* Store an unresolved host name. */
92 * Which address family this address belongs to. AF_INET for IPv4;
93 * AF_INET6 for IPv6; AF_UNSPEC indicates that name resolution has
94 * not been done and a simple host name is held in this SockAddr
98 #define SOCKADDR_FAMILY(addr, step) \
99 (!(addr)->resolved ? AF_UNSPEC : \
100 (step).ai ? (step).ai->ai_family : AF_INET)
102 #define SOCKADDR_FAMILY(addr, step) \
103 (!(addr)->resolved ? AF_UNSPEC : AF_INET)
107 * Start a SockAddrStep structure to step through multiple
111 #define START_STEP(addr, step) \
112 ((step).ai = (addr)->ais, (step).curraddr = 0)
114 #define START_STEP(addr, step) \
115 ((step).curraddr = 0)
118 static tree234 *sktree;
120 static int cmpfortree(void *av, void *bv)
122 Actual_Socket a = (Actual_Socket) av, b = (Actual_Socket) bv;
123 unsigned long as = (unsigned long) a->s, bs = (unsigned long) b->s;
135 static int cmpforsearch(void *av, void *bv)
137 Actual_Socket b = (Actual_Socket) bv;
138 unsigned long as = (unsigned long) av, bs = (unsigned long) b->s;
147 #define DECL_WINSOCK_FUNCTION(linkage, rettype, name, params) \
148 typedef rettype (WINAPI *t_##name) params; \
149 linkage t_##name p_##name
150 #define GET_WINSOCK_FUNCTION(module, name) \
151 p_##name = module ? (t_##name) GetProcAddress(module, #name) : NULL
153 DECL_WINSOCK_FUNCTION(NOTHING, int, WSAAsyncSelect,
154 (SOCKET, HWND, u_int, long));
155 DECL_WINSOCK_FUNCTION(NOTHING, int, WSAEventSelect, (SOCKET, WSAEVENT, long));
156 DECL_WINSOCK_FUNCTION(NOTHING, int, select,
157 (int, fd_set FAR *, fd_set FAR *,
158 fd_set FAR *, const struct timeval FAR *));
159 DECL_WINSOCK_FUNCTION(NOTHING, int, WSAGetLastError, (void));
160 DECL_WINSOCK_FUNCTION(NOTHING, int, WSAEnumNetworkEvents,
161 (SOCKET, WSAEVENT, LPWSANETWORKEVENTS));
162 DECL_WINSOCK_FUNCTION(static, int, WSAStartup, (WORD, LPWSADATA));
163 DECL_WINSOCK_FUNCTION(static, int, WSACleanup, (void));
164 DECL_WINSOCK_FUNCTION(static, int, closesocket, (SOCKET));
165 DECL_WINSOCK_FUNCTION(static, u_long, ntohl, (u_long));
166 DECL_WINSOCK_FUNCTION(static, u_long, htonl, (u_long));
167 DECL_WINSOCK_FUNCTION(static, u_short, htons, (u_short));
168 DECL_WINSOCK_FUNCTION(static, u_short, ntohs, (u_short));
169 DECL_WINSOCK_FUNCTION(static, struct hostent FAR *, gethostbyname,
171 DECL_WINSOCK_FUNCTION(static, struct servent FAR *, getservbyname,
172 (const char FAR *, const char FAR *));
173 DECL_WINSOCK_FUNCTION(static, unsigned long, inet_addr, (const char FAR *));
174 DECL_WINSOCK_FUNCTION(static, char FAR *, inet_ntoa, (struct in_addr));
175 DECL_WINSOCK_FUNCTION(static, int, connect,
176 (SOCKET, const struct sockaddr FAR *, int));
177 DECL_WINSOCK_FUNCTION(static, int, bind,
178 (SOCKET, const struct sockaddr FAR *, int));
179 DECL_WINSOCK_FUNCTION(static, int, setsockopt,
180 (SOCKET, int, int, const char FAR *, int));
181 DECL_WINSOCK_FUNCTION(static, SOCKET, socket, (int, int, int));
182 DECL_WINSOCK_FUNCTION(static, int, listen, (SOCKET, int));
183 DECL_WINSOCK_FUNCTION(static, int, send, (SOCKET, const char FAR *, int, int));
184 DECL_WINSOCK_FUNCTION(static, int, ioctlsocket,
185 (SOCKET, long, u_long FAR *));
186 DECL_WINSOCK_FUNCTION(static, SOCKET, accept,
187 (SOCKET, struct sockaddr FAR *, int FAR *));
188 DECL_WINSOCK_FUNCTION(static, int, recv, (SOCKET, char FAR *, int, int));
189 DECL_WINSOCK_FUNCTION(static, int, WSAIoctl,
190 (SOCKET, DWORD, LPVOID, DWORD, LPVOID, DWORD,
191 LPDWORD, LPWSAOVERLAPPED,
192 LPWSAOVERLAPPED_COMPLETION_ROUTINE));
194 DECL_WINSOCK_FUNCTION(static, int, getaddrinfo,
195 (const char *nodename, const char *servname,
196 const struct addrinfo *hints, struct addrinfo **res));
197 DECL_WINSOCK_FUNCTION(static, void, freeaddrinfo, (struct addrinfo *res));
198 DECL_WINSOCK_FUNCTION(static, int, getnameinfo,
199 (const struct sockaddr FAR * sa, socklen_t salen,
200 char FAR * host, size_t hostlen, char FAR * serv,
201 size_t servlen, int flags));
202 DECL_WINSOCK_FUNCTION(static, char *, gai_strerror, (int ecode));
203 DECL_WINSOCK_FUNCTION(static, int, WSAAddressToStringA,
204 (LPSOCKADDR, DWORD, LPWSAPROTOCOL_INFO,
208 static HMODULE winsock_module = NULL;
209 static WSADATA wsadata;
211 static HMODULE winsock2_module = NULL;
212 static HMODULE wship6_module = NULL;
215 int sk_startup(int hi, int lo)
219 winsock_ver = MAKEWORD(hi, lo);
221 if (p_WSAStartup(winsock_ver, &wsadata)) {
225 if (LOBYTE(wsadata.wVersion) != LOBYTE(winsock_ver)) {
229 #ifdef NET_SETUP_DIAGNOSTICS
232 sprintf(buf, "Using WinSock %d.%d", hi, lo);
244 winsock_module = LoadLibrary("WS2_32.DLL");
245 if (!winsock_module) {
246 winsock_module = LoadLibrary("WSOCK32.DLL");
249 fatalbox("Unable to load any WinSock library");
252 /* Check if we have getaddrinfo in Winsock */
253 if (GetProcAddress(winsock_module, "getaddrinfo") != NULL) {
254 #ifdef NET_SETUP_DIAGNOSTICS
255 logevent(NULL, "Native WinSock IPv6 support detected");
257 GET_WINSOCK_FUNCTION(winsock_module, getaddrinfo);
258 GET_WINSOCK_FUNCTION(winsock_module, freeaddrinfo);
259 GET_WINSOCK_FUNCTION(winsock_module, getnameinfo);
260 GET_WINSOCK_FUNCTION(winsock_module, gai_strerror);
262 /* Fall back to wship6.dll for Windows 2000 */
263 wship6_module = LoadLibrary("wship6.dll");
265 #ifdef NET_SETUP_DIAGNOSTICS
266 logevent(NULL, "WSH IPv6 support detected");
268 GET_WINSOCK_FUNCTION(wship6_module, getaddrinfo);
269 GET_WINSOCK_FUNCTION(wship6_module, freeaddrinfo);
270 GET_WINSOCK_FUNCTION(wship6_module, getnameinfo);
271 GET_WINSOCK_FUNCTION(wship6_module, gai_strerror);
273 #ifdef NET_SETUP_DIAGNOSTICS
274 logevent(NULL, "No IPv6 support detected");
278 GET_WINSOCK_FUNCTION(winsock2_module, WSAAddressToStringA);
280 #ifdef NET_SETUP_DIAGNOSTICS
281 logevent(NULL, "PuTTY was built without IPv6 support");
285 GET_WINSOCK_FUNCTION(winsock_module, WSAAsyncSelect);
286 GET_WINSOCK_FUNCTION(winsock_module, WSAEventSelect);
287 GET_WINSOCK_FUNCTION(winsock_module, select);
288 GET_WINSOCK_FUNCTION(winsock_module, WSAGetLastError);
289 GET_WINSOCK_FUNCTION(winsock_module, WSAEnumNetworkEvents);
290 GET_WINSOCK_FUNCTION(winsock_module, WSAStartup);
291 GET_WINSOCK_FUNCTION(winsock_module, WSACleanup);
292 GET_WINSOCK_FUNCTION(winsock_module, closesocket);
293 GET_WINSOCK_FUNCTION(winsock_module, ntohl);
294 GET_WINSOCK_FUNCTION(winsock_module, htonl);
295 GET_WINSOCK_FUNCTION(winsock_module, htons);
296 GET_WINSOCK_FUNCTION(winsock_module, ntohs);
297 GET_WINSOCK_FUNCTION(winsock_module, gethostbyname);
298 GET_WINSOCK_FUNCTION(winsock_module, getservbyname);
299 GET_WINSOCK_FUNCTION(winsock_module, inet_addr);
300 GET_WINSOCK_FUNCTION(winsock_module, inet_ntoa);
301 GET_WINSOCK_FUNCTION(winsock_module, connect);
302 GET_WINSOCK_FUNCTION(winsock_module, bind);
303 GET_WINSOCK_FUNCTION(winsock_module, setsockopt);
304 GET_WINSOCK_FUNCTION(winsock_module, socket);
305 GET_WINSOCK_FUNCTION(winsock_module, listen);
306 GET_WINSOCK_FUNCTION(winsock_module, send);
307 GET_WINSOCK_FUNCTION(winsock_module, ioctlsocket);
308 GET_WINSOCK_FUNCTION(winsock_module, accept);
309 GET_WINSOCK_FUNCTION(winsock_module, recv);
310 GET_WINSOCK_FUNCTION(winsock_module, WSAIoctl);
312 /* Try to get the best WinSock version we can get */
313 if (!sk_startup(2,2) &&
316 fatalbox("Unable to initialise WinSock");
319 sktree = newtree234(cmpfortree);
322 void sk_cleanup(void)
328 for (i = 0; (s = index234(sktree, i)) != NULL; i++) {
337 FreeLibrary(winsock_module);
340 FreeLibrary(wship6_module);
344 char *winsock_error_string(int error)
348 return "Network error: Permission denied";
350 return "Network error: Address already in use";
351 case WSAEADDRNOTAVAIL:
352 return "Network error: Cannot assign requested address";
353 case WSAEAFNOSUPPORT:
355 "Network error: Address family not supported by protocol family";
357 return "Network error: Operation already in progress";
358 case WSAECONNABORTED:
359 return "Network error: Software caused connection abort";
360 case WSAECONNREFUSED:
361 return "Network error: Connection refused";
363 return "Network error: Connection reset by peer";
364 case WSAEDESTADDRREQ:
365 return "Network error: Destination address required";
367 return "Network error: Bad address";
369 return "Network error: Host is down";
370 case WSAEHOSTUNREACH:
371 return "Network error: No route to host";
373 return "Network error: Operation now in progress";
375 return "Network error: Interrupted function call";
377 return "Network error: Invalid argument";
379 return "Network error: Socket is already connected";
381 return "Network error: Too many open files";
383 return "Network error: Message too long";
385 return "Network error: Network is down";
387 return "Network error: Network dropped connection on reset";
389 return "Network error: Network is unreachable";
391 return "Network error: No buffer space available";
393 return "Network error: Bad protocol option";
395 return "Network error: Socket is not connected";
397 return "Network error: Socket operation on non-socket";
399 return "Network error: Operation not supported";
400 case WSAEPFNOSUPPORT:
401 return "Network error: Protocol family not supported";
403 return "Network error: Too many processes";
404 case WSAEPROTONOSUPPORT:
405 return "Network error: Protocol not supported";
407 return "Network error: Protocol wrong type for socket";
409 return "Network error: Cannot send after socket shutdown";
410 case WSAESOCKTNOSUPPORT:
411 return "Network error: Socket type not supported";
413 return "Network error: Connection timed out";
415 return "Network error: Resource temporarily unavailable";
417 return "Network error: Graceful shutdown in progress";
419 return "Unknown network error";
423 SockAddr sk_namelookup(const char *host, char **canonicalname,
426 SockAddr ret = snew(struct SockAddr_tag);
428 struct hostent *h = NULL;
433 /* Default to IPv4. */
434 hint_family = (address_family == ADDRTYPE_IPV4 ? AF_INET :
436 address_family == ADDRTYPE_IPV6 ? AF_INET6 :
440 /* Clear the structure and default to IPv4. */
441 memset(ret, 0, sizeof(struct SockAddr_tag));
445 ret->addresses = NULL;
446 ret->resolved = FALSE;
449 if ((a = p_inet_addr(host)) == (unsigned long) INADDR_NONE) {
452 * Use getaddrinfo when it's available
455 struct addrinfo hints;
456 #ifdef NET_SETUP_DIAGNOSTICS
457 logevent(NULL, "Using getaddrinfo() for resolving");
459 memset(&hints, 0, sizeof(hints));
460 hints.ai_family = hint_family;
461 hints.ai_flags = AI_CANONNAME;
462 if ((err = p_getaddrinfo(host, NULL, &hints, &ret->ais)) == 0)
463 ret->resolved = TRUE;
467 #ifdef NET_SETUP_DIAGNOSTICS
468 logevent(NULL, "Using gethostbyname() for resolving");
471 * Otherwise use the IPv4-only gethostbyname...
472 * (NOTE: we don't use gethostbyname as a fallback!)
474 if ( (h = p_gethostbyname(host)) )
475 ret->resolved = TRUE;
477 err = p_WSAGetLastError();
480 if (!ret->resolved) {
481 ret->error = (err == WSAENETDOWN ? "Network is down" :
482 err == WSAHOST_NOT_FOUND ? "Host does not exist" :
483 err == WSATRY_AGAIN ? "Host not found" :
485 p_getaddrinfo&&p_gai_strerror ? p_gai_strerror(err) :
487 "gethostbyname: unknown error");
492 /* If we got an address info use that... */
494 /* Are we in IPv4 fallback mode? */
495 /* We put the IPv4 address into the a variable so we can further-on use the IPv4 code... */
496 if (ret->ais->ai_family == AF_INET)
498 (char *) &((SOCKADDR_IN *) ret->ais->
499 ai_addr)->sin_addr, sizeof(a));
501 if (ret->ais->ai_canonname)
502 strncpy(realhost, ret->ais->ai_canonname, lenof(realhost));
504 strncpy(realhost, host, lenof(realhost));
506 /* We used the IPv4-only gethostbyname()... */
511 for (n = 0; h->h_addr_list[n]; n++);
512 ret->addresses = snewn(n, unsigned long);
514 for (n = 0; n < ret->naddresses; n++) {
515 memcpy(&a, h->h_addr_list[n], sizeof(a));
516 ret->addresses[n] = p_ntohl(a);
518 memcpy(&a, h->h_addr, sizeof(a));
519 /* This way we are always sure the h->h_name is valid :) */
520 strncpy(realhost, h->h_name, sizeof(realhost));
525 * This must be a numeric IPv4 address because it caused a
526 * success return from inet_addr.
528 ret->addresses = snewn(1, unsigned long);
530 ret->addresses[0] = p_ntohl(a);
531 ret->resolved = TRUE;
532 strncpy(realhost, host, sizeof(realhost));
534 realhost[lenof(realhost)-1] = '\0';
535 *canonicalname = snewn(1+strlen(realhost), char);
536 strcpy(*canonicalname, realhost);
540 SockAddr sk_nonamelookup(const char *host)
542 SockAddr ret = snew(struct SockAddr_tag);
544 ret->resolved = FALSE;
548 ret->addresses = NULL;
550 strncpy(ret->hostname, host, lenof(ret->hostname));
551 ret->hostname[lenof(ret->hostname)-1] = '\0';
555 int sk_nextaddr(SockAddr addr, SockAddrStep *step)
559 if (step->ai->ai_next) {
560 step->ai = step->ai->ai_next;
566 if (step->curraddr+1 < addr->naddresses) {
574 void sk_getaddr(SockAddr addr, char *buf, int buflen)
577 START_STEP(addr, step);
581 if (p_WSAAddressToStringA) {
582 p_WSAAddressToStringA(step.ai->ai_addr, step.ai->ai_addrlen,
585 strncpy(buf, "IPv6", buflen);
588 if (SOCKADDR_FAMILY(addr, step) == AF_INET) {
590 assert(addr->addresses && step.curraddr < addr->naddresses);
591 a.s_addr = p_htonl(addr->addresses[step.curraddr]);
592 strncpy(buf, p_inet_ntoa(a), buflen);
593 buf[buflen-1] = '\0';
595 strncpy(buf, addr->hostname, buflen);
596 buf[buflen-1] = '\0';
600 int sk_hostname_is_local(char *name)
602 return !strcmp(name, "localhost");
605 static INTERFACE_INFO local_interfaces[16];
606 static int n_local_interfaces; /* 0=not yet, -1=failed, >0=number */
608 static int ipv4_is_local_addr(struct in_addr addr)
610 if (ipv4_is_loopback(addr))
611 return 1; /* loopback addresses are local */
612 if (!n_local_interfaces) {
613 SOCKET s = p_socket(AF_INET, SOCK_DGRAM, 0);
617 p_WSAIoctl(s, SIO_GET_INTERFACE_LIST, NULL, 0,
618 local_interfaces, sizeof(local_interfaces),
619 &retbytes, NULL, NULL) == 0)
620 n_local_interfaces = retbytes / sizeof(INTERFACE_INFO);
622 logevent(NULL, "Unable to get list of local IP addresses");
624 if (n_local_interfaces > 0) {
626 for (i = 0; i < n_local_interfaces; i++) {
627 SOCKADDR_IN *address =
628 (SOCKADDR_IN *)&local_interfaces[i].iiAddress;
629 if (address->sin_addr.s_addr == addr.s_addr)
630 return 1; /* this address is local */
633 return 0; /* this address is not local */
636 int sk_address_is_local(SockAddr addr)
640 START_STEP(addr, step);
641 family = SOCKADDR_FAMILY(addr, step);
644 if (family == AF_INET6) {
645 return IN6_IS_ADDR_LOOPBACK((const struct in6_addr *)step.ai->ai_addr);
648 if (family == AF_INET) {
651 return ipv4_is_local_addr(((struct sockaddr_in *)step.ai->ai_addr)
657 assert(addr->addresses && step.curraddr < addr->naddresses);
658 a.s_addr = p_htonl(addr->addresses[step.curraddr]);
659 return ipv4_is_local_addr(a);
662 assert(family == AF_UNSPEC);
663 return 0; /* we don't know; assume not */
667 int sk_addrtype(SockAddr addr)
671 START_STEP(addr, step);
672 family = SOCKADDR_FAMILY(addr, step);
674 return (family == AF_INET ? ADDRTYPE_IPV4 :
676 family == AF_INET6 ? ADDRTYPE_IPV6 :
681 void sk_addrcopy(SockAddr addr, char *buf)
685 START_STEP(addr, step);
686 family = SOCKADDR_FAMILY(addr, step);
688 assert(family != AF_UNSPEC);
691 if (family == AF_INET)
692 memcpy(buf, &((struct sockaddr_in *)step.ai->ai_addr)->sin_addr,
693 sizeof(struct in_addr));
694 else if (family == AF_INET6)
695 memcpy(buf, &((struct sockaddr_in6 *)step.ai->ai_addr)->sin6_addr,
696 sizeof(struct in6_addr));
701 if (family == AF_INET) {
703 assert(addr->addresses && step.curraddr < addr->naddresses);
704 a.s_addr = p_htonl(addr->addresses[step.curraddr]);
705 memcpy(buf, (char*) &a.s_addr, 4);
709 void sk_addr_free(SockAddr addr)
712 if (addr->ais && p_freeaddrinfo)
713 p_freeaddrinfo(addr->ais);
716 sfree(addr->addresses);
720 static Plug sk_tcp_plug(Socket sock, Plug p)
722 Actual_Socket s = (Actual_Socket) sock;
729 static void sk_tcp_flush(Socket s)
732 * We send data to the socket as soon as we can anyway,
733 * so we don't need to do anything here. :-)
737 static void sk_tcp_close(Socket s);
738 static int sk_tcp_write(Socket s, const char *data, int len);
739 static int sk_tcp_write_oob(Socket s, const char *data, int len);
740 static void sk_tcp_set_private_ptr(Socket s, void *ptr);
741 static void *sk_tcp_get_private_ptr(Socket s);
742 static void sk_tcp_set_frozen(Socket s, int is_frozen);
743 static const char *sk_tcp_socket_error(Socket s);
745 extern char *do_select(SOCKET skt, int startup);
747 Socket sk_register(void *sock, Plug plug)
749 static const struct socket_function_table fn_table = {
755 sk_tcp_set_private_ptr,
756 sk_tcp_get_private_ptr,
766 * Create Socket structure.
768 ret = snew(struct Socket_tag);
772 bufchain_init(&ret->output_data);
773 ret->writable = 1; /* to start with */
774 ret->sending_oob = 0;
776 ret->frozen_readable = 0;
777 ret->localhost_only = 0; /* unused, but best init anyway */
778 ret->pending_error = 0;
779 ret->parent = ret->child = NULL;
782 ret->s = (SOCKET)sock;
784 if (ret->s == INVALID_SOCKET) {
785 err = p_WSAGetLastError();
786 ret->error = winsock_error_string(err);
792 /* Set up a select mechanism. This could be an AsyncSelect on a
793 * window, or an EventSelect on an event object. */
794 errstr = do_select(ret->s, 1);
805 static DWORD try_connect(Actual_Socket sock)
817 if (sock->s != INVALID_SOCKET) {
818 do_select(sock->s, 0);
819 p_closesocket(sock->s);
822 plug_log(sock->plug, 0, sock->addr, sock->port, NULL, 0);
827 family = SOCKADDR_FAMILY(sock->addr, sock->step);
830 * Remove the socket from the tree before we overwrite its
831 * internal socket id, because that forms part of the tree's
832 * sorting criterion. We'll add it back before exiting this
833 * function, whether we changed anything or not.
835 del234(sktree, sock);
837 s = p_socket(family, SOCK_STREAM, 0);
840 if (s == INVALID_SOCKET) {
841 err = p_WSAGetLastError();
842 sock->error = winsock_error_string(err);
846 if (sock->oobinline) {
848 p_setsockopt(s, SOL_SOCKET, SO_OOBINLINE, (void *) &b, sizeof(b));
853 p_setsockopt(s, IPPROTO_TCP, TCP_NODELAY, (void *) &b, sizeof(b));
856 if (sock->keepalive) {
858 p_setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, (void *) &b, sizeof(b));
862 * Bind to local address.
865 localport = 1023; /* count from 1023 downwards */
867 localport = 0; /* just use port 0 (ie winsock picks) */
869 /* Loop round trying to bind */
874 if (family == AF_INET6) {
875 memset(&a6, 0, sizeof(a6));
876 a6.sin6_family = AF_INET6;
877 /*a6.sin6_addr = in6addr_any; */ /* == 0 done by memset() */
878 a6.sin6_port = p_htons(localport);
882 a.sin_family = AF_INET;
883 a.sin_addr.s_addr = p_htonl(INADDR_ANY);
884 a.sin_port = p_htons(localport);
887 sockcode = p_bind(s, (family == AF_INET6 ?
888 (struct sockaddr *) &a6 :
889 (struct sockaddr *) &a),
890 (family == AF_INET6 ? sizeof(a6) : sizeof(a)));
892 sockcode = p_bind(s, (struct sockaddr *) &a, sizeof(a));
894 if (sockcode != SOCKET_ERROR) {
898 err = p_WSAGetLastError();
899 if (err != WSAEADDRINUSE) /* failed, for a bad reason */
904 break; /* we're only looping once */
907 break; /* we might have got to the end */
911 sock->error = winsock_error_string(err);
916 * Connect to remote address.
920 if (family == AF_INET6) {
921 a6.sin6_family = AF_INET6;
922 a6.sin6_port = p_htons((short) sock->port);
924 ((struct sockaddr_in6 *) sock->step.ai->ai_addr)->sin6_addr;
925 a6.sin6_flowinfo = ((struct sockaddr_in6 *) sock->step.ai->ai_addr)->sin6_flowinfo;
926 a6.sin6_scope_id = ((struct sockaddr_in6 *) sock->step.ai->ai_addr)->sin6_scope_id;
928 a.sin_family = AF_INET;
930 ((struct sockaddr_in *) sock->step.ai->ai_addr)->sin_addr;
931 a.sin_port = p_htons((short) sock->port);
936 assert(sock->addr->addresses && sock->step.curraddr < sock->addr->naddresses);
937 a.sin_family = AF_INET;
938 a.sin_addr.s_addr = p_htonl(sock->addr->addresses[sock->step.curraddr]);
939 a.sin_port = p_htons((short) sock->port);
942 /* Set up a select mechanism. This could be an AsyncSelect on a
943 * window, or an EventSelect on an event object. */
944 errstr = do_select(s, 1);
946 sock->error = errstr;
954 ((family == AF_INET6) ? (struct sockaddr *) &a6 :
955 (struct sockaddr *) &a),
956 (family == AF_INET6) ? sizeof(a6) : sizeof(a))
958 p_connect(s, (struct sockaddr *) &a, sizeof(a))
961 err = p_WSAGetLastError();
963 * We expect a potential EWOULDBLOCK here, because the
964 * chances are the front end has done a select for
965 * FD_CONNECT, so that connect() will complete
968 if ( err != WSAEWOULDBLOCK ) {
969 sock->error = winsock_error_string(err);
974 * If we _don't_ get EWOULDBLOCK, the connect has completed
975 * and we should set the socket as writable.
985 * No matter what happened, put the socket back in the tree.
987 add234(sktree, sock);
990 plug_log(sock->plug, 1, sock->addr, sock->port, sock->error, err);
994 Socket sk_new(SockAddr addr, int port, int privport, int oobinline,
995 int nodelay, int keepalive, Plug plug)
997 static const struct socket_function_table fn_table = {
1003 sk_tcp_set_private_ptr,
1004 sk_tcp_get_private_ptr,
1013 * Create Socket structure.
1015 ret = snew(struct Socket_tag);
1016 ret->fn = &fn_table;
1019 bufchain_init(&ret->output_data);
1020 ret->connected = 0; /* to start with */
1021 ret->writable = 0; /* to start with */
1022 ret->sending_oob = 0;
1024 ret->frozen_readable = 0;
1025 ret->localhost_only = 0; /* unused, but best init anyway */
1026 ret->pending_error = 0;
1027 ret->parent = ret->child = NULL;
1028 ret->oobinline = oobinline;
1029 ret->nodelay = nodelay;
1030 ret->keepalive = keepalive;
1031 ret->privport = privport;
1034 START_STEP(ret->addr, ret->step);
1035 ret->s = INVALID_SOCKET;
1039 err = try_connect(ret);
1040 } while (err && sk_nextaddr(ret->addr, &ret->step));
1042 return (Socket) ret;
1045 Socket sk_newlistener(char *srcaddr, int port, Plug plug, int local_host_only,
1046 int orig_address_family)
1048 static const struct socket_function_table fn_table = {
1054 sk_tcp_set_private_ptr,
1055 sk_tcp_get_private_ptr,
1075 * Create Socket structure.
1077 ret = snew(struct Socket_tag);
1078 ret->fn = &fn_table;
1081 bufchain_init(&ret->output_data);
1082 ret->writable = 0; /* to start with */
1083 ret->sending_oob = 0;
1085 ret->frozen_readable = 0;
1086 ret->localhost_only = local_host_only;
1087 ret->pending_error = 0;
1088 ret->parent = ret->child = NULL;
1092 * Translate address_family from platform-independent constants
1093 * into local reality.
1095 address_family = (orig_address_family == ADDRTYPE_IPV4 ? AF_INET :
1097 orig_address_family == ADDRTYPE_IPV6 ? AF_INET6 :
1102 * Our default, if passed the `don't care' value
1103 * ADDRTYPE_UNSPEC, is to listen on IPv4. If IPv6 is supported,
1104 * we will also set up a second socket listening on IPv6, but
1105 * the v4 one is primary since that ought to work even on
1106 * non-v6-supporting systems.
1108 if (address_family == AF_UNSPEC) address_family = AF_INET;
1113 s = p_socket(address_family, SOCK_STREAM, 0);
1116 if (s == INVALID_SOCKET) {
1117 err = p_WSAGetLastError();
1118 ret->error = winsock_error_string(err);
1119 return (Socket) ret;
1124 p_setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (const char *)&on, sizeof(on));
1127 if (address_family == AF_INET6) {
1128 memset(&a6, 0, sizeof(a6));
1129 a6.sin6_family = AF_INET6;
1130 /* FIXME: srcaddr is ignored for IPv6, because I (SGT) don't
1131 * know how to do it. :-)
1132 * (jeroen:) saddr is specified as an address.. eg 2001:db8::1
1133 * Thus we need either a parser that understands [2001:db8::1]:80
1134 * style addresses and/or enhance this to understand hostnames too. */
1135 if (local_host_only)
1136 a6.sin6_addr = in6addr_loopback;
1138 a6.sin6_addr = in6addr_any;
1139 a6.sin6_port = p_htons(port);
1144 a.sin_family = AF_INET;
1147 * Bind to source address. First try an explicitly
1151 a.sin_addr.s_addr = p_inet_addr(srcaddr);
1152 if (a.sin_addr.s_addr != INADDR_NONE) {
1153 /* Override localhost_only with specified listen addr. */
1154 ret->localhost_only = ipv4_is_loopback(a.sin_addr);
1160 * ... and failing that, go with one of the standard ones.
1163 if (local_host_only)
1164 a.sin_addr.s_addr = p_htonl(INADDR_LOOPBACK);
1166 a.sin_addr.s_addr = p_htonl(INADDR_ANY);
1169 a.sin_port = p_htons((short)port);
1172 retcode = p_bind(s, (address_family == AF_INET6 ?
1173 (struct sockaddr *) &a6 :
1174 (struct sockaddr *) &a),
1176 AF_INET6 ? sizeof(a6) : sizeof(a)));
1178 retcode = p_bind(s, (struct sockaddr *) &a, sizeof(a));
1180 if (retcode != SOCKET_ERROR) {
1183 err = p_WSAGetLastError();
1188 ret->error = winsock_error_string(err);
1189 return (Socket) ret;
1193 if (p_listen(s, SOMAXCONN) == SOCKET_ERROR) {
1195 ret->error = winsock_error_string(err);
1196 return (Socket) ret;
1199 /* Set up a select mechanism. This could be an AsyncSelect on a
1200 * window, or an EventSelect on an event object. */
1201 errstr = do_select(s, 1);
1204 ret->error = errstr;
1205 return (Socket) ret;
1208 add234(sktree, ret);
1212 * If we were given ADDRTYPE_UNSPEC, we must also create an
1213 * IPv6 listening socket and link it to this one.
1215 if (address_family == AF_INET && orig_address_family == ADDRTYPE_UNSPEC) {
1216 Actual_Socket other;
1218 other = (Actual_Socket) sk_newlistener(srcaddr, port, plug,
1219 local_host_only, ADDRTYPE_IPV6);
1222 if (!other->error) {
1223 other->parent = ret;
1232 return (Socket) ret;
1235 static void sk_tcp_close(Socket sock)
1237 extern char *do_select(SOCKET skt, int startup);
1238 Actual_Socket s = (Actual_Socket) sock;
1241 sk_tcp_close((Socket)s->child);
1245 p_closesocket(s->s);
1247 sk_addr_free(s->addr);
1252 * The function which tries to send on a socket once it's deemed
1255 void try_send(Actual_Socket s)
1257 while (s->sending_oob || bufchain_size(&s->output_data) > 0) {
1261 int len, urgentflag;
1263 if (s->sending_oob) {
1264 urgentflag = MSG_OOB;
1265 len = s->sending_oob;
1269 bufchain_prefix(&s->output_data, &data, &len);
1271 nsent = p_send(s->s, data, len, urgentflag);
1272 noise_ultralight(nsent);
1274 err = (nsent < 0 ? p_WSAGetLastError() : 0);
1275 if ((err < WSABASEERR && nsent < 0) || err == WSAEWOULDBLOCK) {
1277 * Perfectly normal: we've sent all we can for the moment.
1279 * (Some WinSock send() implementations can return
1280 * <0 but leave no sensible error indication -
1281 * WSAGetLastError() is called but returns zero or
1282 * a small number - so we check that case and treat
1283 * it just like WSAEWOULDBLOCK.)
1285 s->writable = FALSE;
1287 } else if (nsent == 0 ||
1288 err == WSAECONNABORTED || err == WSAECONNRESET) {
1290 * If send() returns CONNABORTED or CONNRESET, we
1291 * unfortunately can't just call plug_closing(),
1292 * because it's quite likely that we're currently
1293 * _in_ a call from the code we'd be calling back
1294 * to, so we'd have to make half the SSH code
1295 * reentrant. Instead we flag a pending error on
1296 * the socket, to be dealt with (by calling
1297 * plug_closing()) at some suitable future moment.
1299 s->pending_error = err;
1302 /* We're inside the Windows frontend here, so we know
1303 * that the frontend handle is unnecessary. */
1304 logevent(NULL, winsock_error_string(err));
1305 fatalbox("%s", winsock_error_string(err));
1308 if (s->sending_oob) {
1310 memmove(s->oobdata, s->oobdata+nsent, len-nsent);
1311 s->sending_oob = len - nsent;
1316 bufchain_consume(&s->output_data, nsent);
1322 static int sk_tcp_write(Socket sock, const char *buf, int len)
1324 Actual_Socket s = (Actual_Socket) sock;
1327 * Add the data to the buffer list on the socket.
1329 bufchain_add(&s->output_data, buf, len);
1332 * Now try sending from the start of the buffer list.
1337 return bufchain_size(&s->output_data);
1340 static int sk_tcp_write_oob(Socket sock, const char *buf, int len)
1342 Actual_Socket s = (Actual_Socket) sock;
1345 * Replace the buffer list on the socket with the data.
1347 bufchain_clear(&s->output_data);
1348 assert(len <= sizeof(s->oobdata));
1349 memcpy(s->oobdata, buf, len);
1350 s->sending_oob = len;
1353 * Now try sending from the start of the buffer list.
1358 return s->sending_oob;
1361 int select_result(WPARAM wParam, LPARAM lParam)
1365 char buf[20480]; /* nice big buffer for plenty of speed */
1369 /* wParam is the socket itself */
1372 return 1; /* boggle */
1374 s = find234(sktree, (void *) wParam, cmpforsearch);
1376 return 1; /* boggle */
1378 if ((err = WSAGETSELECTERROR(lParam)) != 0) {
1380 * An error has occurred on this socket. Pass it to the
1384 plug_log(s->plug, 1, s->addr, s->port,
1385 winsock_error_string(err), err);
1386 while (s->addr && sk_nextaddr(s->addr, &s->step)) {
1387 err = try_connect(s);
1391 return plug_closing(s->plug, winsock_error_string(err), err, 0);
1396 noise_ultralight(lParam);
1398 switch (WSAGETSELECTEVENT(lParam)) {
1400 s->connected = s->writable = 1;
1402 * Once a socket is connected, we can stop falling
1403 * back through the candidate addresses to connect
1407 sk_addr_free(s->addr);
1412 /* In the case the socket is still frozen, we don't even bother */
1414 s->frozen_readable = 1;
1419 * We have received data on the socket. For an oobinline
1420 * socket, this might be data _before_ an urgent pointer,
1421 * in which case we send it to the back end with type==1
1422 * (data prior to urgent).
1426 p_ioctlsocket(s->s, SIOCATMARK, &atmark);
1428 * Avoid checking the return value from ioctlsocket(),
1429 * on the grounds that some WinSock wrappers don't
1430 * support it. If it does nothing, we get atmark==1,
1431 * which is equivalent to `no OOB pending', so the
1432 * effect will be to non-OOB-ify any OOB data.
1437 ret = p_recv(s->s, buf, sizeof(buf), 0);
1438 noise_ultralight(ret);
1440 err = p_WSAGetLastError();
1441 if (err == WSAEWOULDBLOCK) {
1446 return plug_closing(s->plug, winsock_error_string(err), err,
1448 } else if (0 == ret) {
1449 return plug_closing(s->plug, NULL, 0, 0);
1451 return plug_receive(s->plug, atmark ? 0 : 1, buf, ret);
1456 * This will only happen on a non-oobinline socket. It
1457 * indicates that we can immediately perform an OOB read
1458 * and get back OOB data, which we will send to the back
1459 * end with type==2 (urgent data).
1461 ret = p_recv(s->s, buf, sizeof(buf), MSG_OOB);
1462 noise_ultralight(ret);
1464 char *str = (ret == 0 ? "Internal networking trouble" :
1465 winsock_error_string(p_WSAGetLastError()));
1466 /* We're inside the Windows frontend here, so we know
1467 * that the frontend handle is unnecessary. */
1468 logevent(NULL, str);
1469 fatalbox("%s", str);
1471 return plug_receive(s->plug, 2, buf, ret);
1476 int bufsize_before, bufsize_after;
1478 bufsize_before = s->sending_oob + bufchain_size(&s->output_data);
1480 bufsize_after = s->sending_oob + bufchain_size(&s->output_data);
1481 if (bufsize_after < bufsize_before)
1482 plug_sent(s->plug, bufsize_after);
1486 /* Signal a close on the socket. First read any outstanding data. */
1489 ret = p_recv(s->s, buf, sizeof(buf), 0);
1491 err = p_WSAGetLastError();
1492 if (err == WSAEWOULDBLOCK)
1494 return plug_closing(s->plug, winsock_error_string(err),
1498 open &= plug_receive(s->plug, 0, buf, ret);
1500 open &= plug_closing(s->plug, NULL, 0, 0);
1507 struct sockaddr_in isa;
1509 struct sockaddr_storage isa;
1511 int addrlen = sizeof(isa);
1512 SOCKET t; /* socket of connection */
1514 memset(&isa, 0, sizeof(isa));
1516 t = p_accept(s->s,(struct sockaddr *)&isa,&addrlen);
1517 if (t == INVALID_SOCKET)
1519 err = p_WSAGetLastError();
1520 if (err == WSATRY_AGAIN)
1524 if (isa.ss_family == AF_INET &&
1525 s->localhost_only &&
1526 !ipv4_is_local_addr(((struct sockaddr_in *)&isa)->sin_addr))
1528 if (s->localhost_only && !ipv4_is_local_addr(isa.sin_addr))
1531 p_closesocket(t); /* dodgy WinSock let nonlocal through */
1532 } else if (plug_accepting(s->plug, (void*)t)) {
1533 p_closesocket(t); /* denied or error */
1542 * Deal with socket errors detected in try_send().
1544 void net_pending_errors(void)
1550 * This might be a fiddly business, because it's just possible
1551 * that handling a pending error on one socket might cause
1552 * others to be closed. (I can't think of any reason this might
1553 * happen in current SSH implementation, but to maintain
1554 * generality of this network layer I'll assume the worst.)
1556 * So what we'll do is search the socket list for _one_ socket
1557 * with a pending error, and then handle it, and then search
1558 * the list again _from the beginning_. Repeat until we make a
1559 * pass with no socket errors present. That way we are
1560 * protected against the socket list changing under our feet.
1564 for (i = 0; (s = index234(sktree, i)) != NULL; i++) {
1565 if (s->pending_error) {
1567 * An error has occurred on this socket. Pass it to the
1570 plug_closing(s->plug,
1571 winsock_error_string(s->pending_error),
1572 s->pending_error, 0);
1580 * Each socket abstraction contains a `void *' private field in
1581 * which the client can keep state.
1583 static void sk_tcp_set_private_ptr(Socket sock, void *ptr)
1585 Actual_Socket s = (Actual_Socket) sock;
1586 s->private_ptr = ptr;
1589 static void *sk_tcp_get_private_ptr(Socket sock)
1591 Actual_Socket s = (Actual_Socket) sock;
1592 return s->private_ptr;
1596 * Special error values are returned from sk_namelookup and sk_new
1597 * if there's a problem. These functions extract an error message,
1598 * or return NULL if there's no problem.
1600 const char *sk_addr_error(SockAddr addr)
1604 static const char *sk_tcp_socket_error(Socket sock)
1606 Actual_Socket s = (Actual_Socket) sock;
1610 static void sk_tcp_set_frozen(Socket sock, int is_frozen)
1612 Actual_Socket s = (Actual_Socket) sock;
1613 if (s->frozen == is_frozen)
1615 s->frozen = is_frozen;
1618 if (s->frozen_readable) {
1620 p_recv(s->s, &c, 1, MSG_PEEK);
1623 s->frozen_readable = 0;
1626 void socket_reselect_all(void)
1631 for (i = 0; (s = index234(sktree, i)) != NULL; i++) {
1638 * For Plink: enumerate all sockets currently active.
1640 SOCKET first_socket(int *state)
1644 s = index234(sktree, (*state)++);
1645 return s ? s->s : INVALID_SOCKET;
1648 SOCKET next_socket(int *state)
1650 Actual_Socket s = index234(sktree, (*state)++);
1651 return s ? s->s : INVALID_SOCKET;
1654 extern int socket_writable(SOCKET skt)
1656 Actual_Socket s = find234(sktree, (void *)skt, cmpforsearch);
1659 return bufchain_size(&s->output_data) > 0;
1664 int net_service_lookup(char *service)
1667 se = p_getservbyname(service, NULL);
1669 return p_ntohs(se->s_port);
1674 SockAddr platform_get_x11_unix_address(const char *display, int displaynum,
1675 char **canonicalname)
1677 SockAddr ret = snew(struct SockAddr_tag);
1678 memset(ret, 0, sizeof(struct SockAddr_tag));
1679 ret->error = "unix sockets not supported on this platform";