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 const struct socket_function_table *fn;
39 /* the above variable absolutely *must* be the first in this structure */
47 int frozen; /* this causes readability notifications to be ignored */
48 int frozen_readable; /* this means we missed at least one readability
49 * notification while we were frozen */
50 int localhost_only; /* for listening sockets */
53 int oobinline, nodelay, keepalive, privport;
56 int pending_error; /* in case send() returns error */
58 * We sometimes need pairs of Socket structures to be linked:
59 * if we are listening on the same IPv6 and v4 port, for
60 * example. So here we define `parent' and `child' pointers to
63 Actual_Socket parent, child;
69 * Which address family this address belongs to. AF_INET for
70 * IPv4; AF_INET6 for IPv6; AF_UNSPEC indicates that name
71 * resolution has not been done and a simple host name is held
72 * in this SockAddr structure.
73 * The hostname field is also used when the hostname has both
74 * an IPv6 and IPv4 address and the IPv6 connection attempt
75 * fails. We then try the IPv4 address.
76 * This 'family' should become an option in the GUI and
77 * on the commandline for selecting a default protocol.
81 struct addrinfo *ais; /* Addresses IPv6 style. */
82 struct addrinfo *ai; /* steps along the linked list */
84 unsigned long *addresses; /* Addresses IPv4 style. */
85 int naddresses, curraddr;
86 char hostname[512]; /* Store an unresolved host name. */
89 static tree234 *sktree;
91 static int cmpfortree(void *av, void *bv)
93 Actual_Socket a = (Actual_Socket) av, b = (Actual_Socket) bv;
94 unsigned long as = (unsigned long) a->s, bs = (unsigned long) b->s;
102 static int cmpforsearch(void *av, void *bv)
104 Actual_Socket b = (Actual_Socket) bv;
105 unsigned long as = (unsigned long) av, bs = (unsigned long) b->s;
114 #define DECL_WINSOCK_FUNCTION(linkage, rettype, name, params) \
115 typedef rettype (WINAPI *t_##name) params; \
116 linkage t_##name p_##name
117 #define GET_WINSOCK_FUNCTION(module, name) \
118 p_##name = (t_##name) GetProcAddress(module, #name)
120 DECL_WINSOCK_FUNCTION(NOTHING, int, WSAAsyncSelect,
121 (SOCKET, HWND, u_int, long));
122 DECL_WINSOCK_FUNCTION(NOTHING, int, WSAEventSelect, (SOCKET, WSAEVENT, long));
123 DECL_WINSOCK_FUNCTION(NOTHING, int, select,
124 (int, fd_set FAR *, fd_set FAR *,
125 fd_set FAR *, const struct timeval FAR *));
126 DECL_WINSOCK_FUNCTION(NOTHING, int, WSAGetLastError, (void));
127 DECL_WINSOCK_FUNCTION(NOTHING, int, WSAEnumNetworkEvents,
128 (SOCKET, WSAEVENT, LPWSANETWORKEVENTS));
129 DECL_WINSOCK_FUNCTION(static, int, WSAStartup, (WORD, LPWSADATA));
130 DECL_WINSOCK_FUNCTION(static, int, WSACleanup, (void));
131 DECL_WINSOCK_FUNCTION(static, int, closesocket, (SOCKET));
132 DECL_WINSOCK_FUNCTION(static, u_long, ntohl, (u_long));
133 DECL_WINSOCK_FUNCTION(static, u_long, htonl, (u_long));
134 DECL_WINSOCK_FUNCTION(static, u_short, htons, (u_short));
135 DECL_WINSOCK_FUNCTION(static, u_short, ntohs, (u_short));
136 DECL_WINSOCK_FUNCTION(static, struct hostent FAR *, gethostbyname,
138 DECL_WINSOCK_FUNCTION(static, struct servent FAR *, getservbyname,
139 (const char FAR *, const char FAR *));
140 DECL_WINSOCK_FUNCTION(static, unsigned long, inet_addr, (const char FAR *));
141 DECL_WINSOCK_FUNCTION(static, char FAR *, inet_ntoa, (struct in_addr));
142 DECL_WINSOCK_FUNCTION(static, int, connect,
143 (SOCKET, const struct sockaddr FAR *, int));
144 DECL_WINSOCK_FUNCTION(static, int, bind,
145 (SOCKET, const struct sockaddr FAR *, int));
146 DECL_WINSOCK_FUNCTION(static, int, setsockopt,
147 (SOCKET, int, int, const char FAR *, int));
148 DECL_WINSOCK_FUNCTION(static, SOCKET, socket, (int, int, int));
149 DECL_WINSOCK_FUNCTION(static, int, listen, (SOCKET, int));
150 DECL_WINSOCK_FUNCTION(static, int, send, (SOCKET, const char FAR *, int, int));
151 DECL_WINSOCK_FUNCTION(static, int, ioctlsocket,
152 (SOCKET, long, u_long FAR *));
153 DECL_WINSOCK_FUNCTION(static, SOCKET, accept,
154 (SOCKET, struct sockaddr FAR *, int FAR *));
155 DECL_WINSOCK_FUNCTION(static, int, recv, (SOCKET, char FAR *, int, int));
156 DECL_WINSOCK_FUNCTION(static, int, WSAIoctl,
157 (SOCKET, DWORD, LPVOID, DWORD, LPVOID, DWORD,
158 LPDWORD, LPWSAOVERLAPPED,
159 LPWSAOVERLAPPED_COMPLETION_ROUTINE));
161 DECL_WINSOCK_FUNCTION(static, int, getaddrinfo,
162 (const char *nodename, const char *servname,
163 const struct addrinfo *hints, struct addrinfo **res));
164 DECL_WINSOCK_FUNCTION(static, void, freeaddrinfo, (struct addrinfo *res));
165 DECL_WINSOCK_FUNCTION(static, int, getnameinfo,
166 (const struct sockaddr FAR * sa, socklen_t salen,
167 char FAR * host, size_t hostlen, char FAR * serv,
168 size_t servlen, int flags));
171 static HMODULE winsock_module;
173 static HMODULE wship6_module;
181 winsock_ver = MAKEWORD(2, 0);
182 winsock_module = LoadLibrary("WS2_32.DLL");
183 if (!winsock_module) {
184 winsock_module = LoadLibrary("WSOCK32.DLL");
185 winsock_ver = MAKEWORD(1, 1);
188 fatalbox("Unable to load any WinSock library");
191 wship6_module = LoadLibrary("wship6.dll");
193 GET_WINSOCK_FUNCTION(wship6_module, getaddrinfo);
194 GET_WINSOCK_FUNCTION(wship6_module, freeaddrinfo);
195 GET_WINSOCK_FUNCTION(wship6_module, getnameinfo);
199 GET_WINSOCK_FUNCTION(winsock_module, WSAAsyncSelect);
200 GET_WINSOCK_FUNCTION(winsock_module, WSAEventSelect);
201 GET_WINSOCK_FUNCTION(winsock_module, select);
202 GET_WINSOCK_FUNCTION(winsock_module, WSAGetLastError);
203 GET_WINSOCK_FUNCTION(winsock_module, WSAEnumNetworkEvents);
204 GET_WINSOCK_FUNCTION(winsock_module, WSAStartup);
205 GET_WINSOCK_FUNCTION(winsock_module, WSACleanup);
206 GET_WINSOCK_FUNCTION(winsock_module, closesocket);
207 GET_WINSOCK_FUNCTION(winsock_module, ntohl);
208 GET_WINSOCK_FUNCTION(winsock_module, htonl);
209 GET_WINSOCK_FUNCTION(winsock_module, htons);
210 GET_WINSOCK_FUNCTION(winsock_module, ntohs);
211 GET_WINSOCK_FUNCTION(winsock_module, gethostbyname);
212 GET_WINSOCK_FUNCTION(winsock_module, getservbyname);
213 GET_WINSOCK_FUNCTION(winsock_module, inet_addr);
214 GET_WINSOCK_FUNCTION(winsock_module, inet_ntoa);
215 GET_WINSOCK_FUNCTION(winsock_module, connect);
216 GET_WINSOCK_FUNCTION(winsock_module, bind);
217 GET_WINSOCK_FUNCTION(winsock_module, setsockopt);
218 GET_WINSOCK_FUNCTION(winsock_module, socket);
219 GET_WINSOCK_FUNCTION(winsock_module, listen);
220 GET_WINSOCK_FUNCTION(winsock_module, send);
221 GET_WINSOCK_FUNCTION(winsock_module, ioctlsocket);
222 GET_WINSOCK_FUNCTION(winsock_module, accept);
223 GET_WINSOCK_FUNCTION(winsock_module, recv);
224 GET_WINSOCK_FUNCTION(winsock_module, WSAIoctl);
226 if (p_WSAStartup(winsock_ver, &wsadata)) {
227 fatalbox("Unable to initialise WinSock");
229 if (LOBYTE(wsadata.wVersion) != LOBYTE(winsock_ver)) {
231 fatalbox("WinSock version is incompatible with %d.%d",
232 LOBYTE(winsock_ver), HIBYTE(winsock_ver));
235 sktree = newtree234(cmpfortree);
238 void sk_cleanup(void)
244 for (i = 0; (s = index234(sktree, i)) != NULL; i++) {
253 FreeLibrary(winsock_module);
256 FreeLibrary(wship6_module);
260 char *winsock_error_string(int error)
264 return "Network error: Permission denied";
266 return "Network error: Address already in use";
267 case WSAEADDRNOTAVAIL:
268 return "Network error: Cannot assign requested address";
269 case WSAEAFNOSUPPORT:
271 "Network error: Address family not supported by protocol family";
273 return "Network error: Operation already in progress";
274 case WSAECONNABORTED:
275 return "Network error: Software caused connection abort";
276 case WSAECONNREFUSED:
277 return "Network error: Connection refused";
279 return "Network error: Connection reset by peer";
280 case WSAEDESTADDRREQ:
281 return "Network error: Destination address required";
283 return "Network error: Bad address";
285 return "Network error: Host is down";
286 case WSAEHOSTUNREACH:
287 return "Network error: No route to host";
289 return "Network error: Operation now in progress";
291 return "Network error: Interrupted function call";
293 return "Network error: Invalid argument";
295 return "Network error: Socket is already connected";
297 return "Network error: Too many open files";
299 return "Network error: Message too long";
301 return "Network error: Network is down";
303 return "Network error: Network dropped connection on reset";
305 return "Network error: Network is unreachable";
307 return "Network error: No buffer space available";
309 return "Network error: Bad protocol option";
311 return "Network error: Socket is not connected";
313 return "Network error: Socket operation on non-socket";
315 return "Network error: Operation not supported";
316 case WSAEPFNOSUPPORT:
317 return "Network error: Protocol family not supported";
319 return "Network error: Too many processes";
320 case WSAEPROTONOSUPPORT:
321 return "Network error: Protocol not supported";
323 return "Network error: Protocol wrong type for socket";
325 return "Network error: Cannot send after socket shutdown";
326 case WSAESOCKTNOSUPPORT:
327 return "Network error: Socket type not supported";
329 return "Network error: Connection timed out";
331 return "Network error: Resource temporarily unavailable";
333 return "Network error: Graceful shutdown in progress";
335 return "Unknown network error";
339 SockAddr sk_namelookup(const char *host, char **canonicalname,
342 SockAddr ret = snew(struct SockAddr_tag);
344 struct hostent *h = NULL;
349 /* Clear the structure and default to IPv4. */
350 memset(ret, 0, sizeof(struct SockAddr_tag));
351 ret->family = (address_family == ADDRTYPE_IPV4 ? AF_INET :
353 address_family == ADDRTYPE_IPV6 ? AF_INET6 :
357 ret->ai = ret->ais = NULL;
359 ret->addresses = NULL;
360 ret_family = AF_UNSPEC;
363 if ((a = p_inet_addr(host)) == (unsigned long) INADDR_NONE) {
366 * Use getaddrinfo when it's available
369 struct addrinfo hints;
370 memset(&hints, 0, sizeof(hints));
371 hints.ai_family = ret->family;
372 hints.ai_flags = AI_CANONNAME;
373 if ((err = p_getaddrinfo(host, NULL, &hints, &ret->ais)) == 0)
374 ret_family = ret->ais->ai_family;
380 * Otherwise use the IPv4-only gethostbyname...
381 * (NOTE: we don't use gethostbyname as a fallback!)
383 if ( (h = p_gethostbyname(host)) )
384 ret_family = AF_INET;
386 err = p_WSAGetLastError();
389 if (ret_family == AF_UNSPEC) {
390 ret->error = (err == WSAENETDOWN ? "Network is down" :
391 err == WSAHOST_NOT_FOUND ? "Host does not exist" :
392 err == WSATRY_AGAIN ? "Host not found" :
394 p_getaddrinfo ? "getaddrinfo: unknown error" :
396 "gethostbyname: unknown error");
399 ret->family = ret_family;
402 /* If we got an address info use that... */
404 /* Are we in IPv4 fallback mode? */
405 /* We put the IPv4 address into the a variable so we can further-on use the IPv4 code... */
406 if (ret->family == AF_INET)
408 (char *) &((SOCKADDR_IN *) ret->ai->
409 ai_addr)->sin_addr, sizeof(a));
411 if (ret->ai->ai_canonname)
412 strncpy(realhost, ret->ai->ai_canonname, lenof(realhost));
414 strncpy(realhost, host, lenof(realhost));
416 /* We used the IPv4-only gethostbyname()... */
421 for (n = 0; h->h_addr_list[n]; n++);
422 ret->addresses = snewn(n, unsigned long);
424 for (n = 0; n < ret->naddresses; n++) {
425 memcpy(&a, h->h_addr_list[n], sizeof(a));
426 ret->addresses[n] = p_ntohl(a);
429 memcpy(&a, h->h_addr, sizeof(a));
430 /* This way we are always sure the h->h_name is valid :) */
431 strncpy(realhost, h->h_name, sizeof(realhost));
436 * This must be a numeric IPv4 address because it caused a
437 * success return from inet_addr.
439 ret->addresses = snewn(1, unsigned long);
442 ret->addresses[0] = p_ntohl(a);
443 ret->family = AF_INET;
444 strncpy(realhost, host, sizeof(realhost));
446 realhost[lenof(realhost)-1] = '\0';
447 *canonicalname = snewn(1+strlen(realhost), char);
448 strcpy(*canonicalname, realhost);
452 SockAddr sk_nonamelookup(const char *host)
454 SockAddr ret = snew(struct SockAddr_tag);
456 ret->family = AF_UNSPEC;
458 ret->ai = ret->ais = NULL;
460 ret->addresses = NULL;
462 strncpy(ret->hostname, host, lenof(ret->hostname));
463 ret->hostname[lenof(ret->hostname)-1] = '\0';
467 int sk_nextaddr(SockAddr addr)
471 if (addr->ai->ai_next) {
472 addr->ai = addr->ai->ai_next;
473 addr->family = addr->ai->ai_family;
479 if (addr->curraddr+1 < addr->naddresses) {
487 void sk_getaddr(SockAddr addr, char *buf, int buflen)
491 /* Try to get the WSAAddressToStringA() function from wship6.dll */
492 /* This way one doesn't need to have IPv6 dll's to use PuTTY and
493 * it will fallback to IPv4. */
494 typedef int (CALLBACK * FADDRTOSTR) (LPSOCKADDR lpsaAddress,
495 DWORD dwAddressLength,
496 LPWSAPROTOCOL_INFO lpProtocolInfo,
497 OUT LPTSTR lpszAddressString,
498 IN OUT LPDWORD lpdwAddressStringLength
500 FADDRTOSTR fAddrToStr = NULL;
502 HINSTANCE dllWS2 = LoadLibrary("ws2_32.dll");
504 fAddrToStr = (FADDRTOSTR)GetProcAddress(dllWS2,
505 "WSAAddressToStringA");
507 fAddrToStr(addr->ai->ai_addr, addr->ai->ai_addrlen,
510 else strncpy(buf, "IPv6", buflen);
515 if (addr->family == AF_INET) {
517 assert(addr->addresses && addr->curraddr < addr->naddresses);
518 a.s_addr = p_htonl(addr->addresses[addr->curraddr]);
519 strncpy(buf, p_inet_ntoa(a), buflen);
520 buf[buflen-1] = '\0';
522 strncpy(buf, addr->hostname, buflen);
523 buf[buflen-1] = '\0';
527 int sk_hostname_is_local(char *name)
529 return !strcmp(name, "localhost");
532 static INTERFACE_INFO local_interfaces[16];
533 static int n_local_interfaces; /* 0=not yet, -1=failed, >0=number */
535 static int ipv4_is_local_addr(struct in_addr addr)
537 if (ipv4_is_loopback(addr))
538 return 1; /* loopback addresses are local */
539 if (!n_local_interfaces) {
540 SOCKET s = p_socket(AF_INET, SOCK_DGRAM, 0);
544 p_WSAIoctl(s, SIO_GET_INTERFACE_LIST, NULL, 0,
545 local_interfaces, sizeof(local_interfaces),
546 &retbytes, NULL, NULL) == 0)
547 n_local_interfaces = retbytes / sizeof(INTERFACE_INFO);
549 logevent(NULL, "Unable to get list of local IP addresses");
551 if (n_local_interfaces > 0) {
553 for (i = 0; i < n_local_interfaces; i++) {
554 SOCKADDR_IN *address =
555 (SOCKADDR_IN *)&local_interfaces[i].iiAddress;
556 if (address->sin_addr.s_addr == addr.s_addr)
557 return 1; /* this address is local */
560 return 0; /* this address is not local */
563 int sk_address_is_local(SockAddr addr)
566 if (addr->family == AF_INET6) {
567 return IN6_IS_ADDR_LOOPBACK((const struct in6_addr *)addr->ai->ai_addr);
570 if (addr->family == AF_INET) {
573 return ipv4_is_local_addr(((struct sockaddr_in *)addr->ai->ai_addr)
579 assert(addr->addresses && addr->curraddr < addr->naddresses);
580 a.s_addr = p_htonl(addr->addresses[addr->curraddr]);
581 return ipv4_is_local_addr(a);
584 assert(addr->family == AF_UNSPEC);
585 return 0; /* we don't know; assume not */
589 int sk_addrtype(SockAddr addr)
591 return (addr->family == AF_INET ? ADDRTYPE_IPV4 :
593 addr->family == AF_INET6 ? ADDRTYPE_IPV6 :
598 void sk_addrcopy(SockAddr addr, char *buf)
600 assert(addr->family != AF_UNSPEC);
603 if (addr->family == AF_INET)
604 memcpy(buf, &((struct sockaddr_in *)addr->ai->ai_addr)->sin_addr,
605 sizeof(struct in_addr));
606 else if (addr->family == AF_INET6)
607 memcpy(buf, &((struct sockaddr_in6 *)addr->ai->ai_addr)->sin6_addr,
608 sizeof(struct in6_addr));
613 if (addr->family == AF_INET) {
615 assert(addr->addresses && addr->curraddr < addr->naddresses);
616 a.s_addr = p_htonl(addr->addresses[addr->curraddr]);
617 memcpy(buf, (char*) &a.s_addr, 4);
621 void sk_addr_free(SockAddr addr)
624 if (addr->ais && p_freeaddrinfo)
625 p_freeaddrinfo(addr->ais);
628 sfree(addr->addresses);
632 static Plug sk_tcp_plug(Socket sock, Plug p)
634 Actual_Socket s = (Actual_Socket) sock;
641 static void sk_tcp_flush(Socket s)
644 * We send data to the socket as soon as we can anyway,
645 * so we don't need to do anything here. :-)
649 static void sk_tcp_close(Socket s);
650 static int sk_tcp_write(Socket s, const char *data, int len);
651 static int sk_tcp_write_oob(Socket s, const char *data, int len);
652 static void sk_tcp_set_private_ptr(Socket s, void *ptr);
653 static void *sk_tcp_get_private_ptr(Socket s);
654 static void sk_tcp_set_frozen(Socket s, int is_frozen);
655 static const char *sk_tcp_socket_error(Socket s);
657 extern char *do_select(SOCKET skt, int startup);
659 Socket sk_register(void *sock, Plug plug)
661 static const struct socket_function_table fn_table = {
667 sk_tcp_set_private_ptr,
668 sk_tcp_get_private_ptr,
678 * Create Socket structure.
680 ret = snew(struct Socket_tag);
684 bufchain_init(&ret->output_data);
685 ret->writable = 1; /* to start with */
686 ret->sending_oob = 0;
688 ret->frozen_readable = 0;
689 ret->localhost_only = 0; /* unused, but best init anyway */
690 ret->pending_error = 0;
691 ret->parent = ret->child = NULL;
694 ret->s = (SOCKET)sock;
696 if (ret->s == INVALID_SOCKET) {
697 err = p_WSAGetLastError();
698 ret->error = winsock_error_string(err);
704 /* Set up a select mechanism. This could be an AsyncSelect on a
705 * window, or an EventSelect on an event object. */
706 errstr = do_select(ret->s, 1);
717 static DWORD try_connect(Actual_Socket sock)
729 if (sock->s != INVALID_SOCKET) {
730 do_select(sock->s, 0);
731 p_closesocket(sock->s);
734 plug_log(sock->plug, 0, sock->addr, sock->port, NULL, 0);
740 /* Let's default to IPv6, this shouldn't hurt anybody
741 * If the stack supports IPv6 it will also allow IPv4 connections. */
742 if (sock->addr->ai) {
743 family = sock->addr->ai->ai_family;
747 /* Default to IPv4 */
751 s = p_socket(family, SOCK_STREAM, 0);
754 if (s == INVALID_SOCKET) {
755 err = p_WSAGetLastError();
756 sock->error = winsock_error_string(err);
760 if (sock->oobinline) {
762 p_setsockopt(s, SOL_SOCKET, SO_OOBINLINE, (void *) &b, sizeof(b));
767 p_setsockopt(s, IPPROTO_TCP, TCP_NODELAY, (void *) &b, sizeof(b));
770 if (sock->keepalive) {
772 p_setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, (void *) &b, sizeof(b));
776 * Bind to local address.
779 localport = 1023; /* count from 1023 downwards */
781 localport = 0; /* just use port 0 (ie winsock picks) */
783 /* Loop round trying to bind */
788 if (family == AF_INET6) {
789 memset(&a6, 0, sizeof(a6));
790 a6.sin6_family = AF_INET6;
791 /*a6.sin6_addr = in6addr_any; */ /* == 0 done by memset() */
792 a6.sin6_port = p_htons(localport);
796 a.sin_family = AF_INET;
797 a.sin_addr.s_addr = p_htonl(INADDR_ANY);
798 a.sin_port = p_htons(localport);
801 sockcode = p_bind(s, (sock->addr->family == AF_INET6 ?
802 (struct sockaddr *) &a6 :
803 (struct sockaddr *) &a),
804 (sock->addr->family ==
805 AF_INET6 ? sizeof(a6) : sizeof(a)));
807 sockcode = p_bind(s, (struct sockaddr *) &a, sizeof(a));
809 if (sockcode != SOCKET_ERROR) {
813 err = p_WSAGetLastError();
814 if (err != WSAEADDRINUSE) /* failed, for a bad reason */
819 break; /* we're only looping once */
822 break; /* we might have got to the end */
826 sock->error = winsock_error_string(err);
831 * Connect to remote address.
834 if (sock->addr->ai) {
835 if (family == AF_INET6) {
836 a6.sin6_family = AF_INET6;
837 a6.sin6_port = p_htons((short) sock->port);
839 ((struct sockaddr_in6 *) sock->addr->ai->ai_addr)->sin6_addr;
841 a.sin_family = AF_INET;
843 ((struct sockaddr_in *) sock->addr->ai->ai_addr)->sin_addr;
844 a.sin_port = p_htons((short) sock->port);
849 assert(sock->addr->addresses && sock->addr->curraddr < sock->addr->naddresses);
850 a.sin_family = AF_INET;
851 a.sin_addr.s_addr = p_htonl(sock->addr->addresses[sock->addr->curraddr]);
852 a.sin_port = p_htons((short) sock->port);
855 /* Set up a select mechanism. This could be an AsyncSelect on a
856 * window, or an EventSelect on an event object. */
857 errstr = do_select(s, 1);
859 sock->error = errstr;
867 ((family == AF_INET6) ? (struct sockaddr *) &a6 :
868 (struct sockaddr *) &a),
869 (family == AF_INET6) ? sizeof(a6) : sizeof(a))
871 p_connect(s, (struct sockaddr *) &a, sizeof(a))
874 err = p_WSAGetLastError();
876 * We expect a potential EWOULDBLOCK here, because the
877 * chances are the front end has done a select for
878 * FD_CONNECT, so that connect() will complete
881 if ( err != WSAEWOULDBLOCK ) {
882 sock->error = winsock_error_string(err);
887 * If we _don't_ get EWOULDBLOCK, the connect has completed
888 * and we should set the socket as writable.
893 add234(sktree, sock);
899 plug_log(sock->plug, 1, sock->addr, sock->port, sock->error, err);
903 Socket sk_new(SockAddr addr, int port, int privport, int oobinline,
904 int nodelay, int keepalive, Plug plug)
906 static const struct socket_function_table fn_table = {
912 sk_tcp_set_private_ptr,
913 sk_tcp_get_private_ptr,
922 * Create Socket structure.
924 ret = snew(struct Socket_tag);
928 bufchain_init(&ret->output_data);
929 ret->connected = 0; /* to start with */
930 ret->writable = 0; /* to start with */
931 ret->sending_oob = 0;
933 ret->frozen_readable = 0;
934 ret->localhost_only = 0; /* unused, but best init anyway */
935 ret->pending_error = 0;
936 ret->parent = ret->child = NULL;
937 ret->oobinline = oobinline;
938 ret->nodelay = nodelay;
939 ret->keepalive = keepalive;
940 ret->privport = privport;
943 ret->s = INVALID_SOCKET;
947 err = try_connect(ret);
948 } while (err && sk_nextaddr(ret->addr));
953 Socket sk_newlistener(char *srcaddr, int port, Plug plug, int local_host_only,
954 int orig_address_family)
956 static const struct socket_function_table fn_table = {
962 sk_tcp_set_private_ptr,
963 sk_tcp_get_private_ptr,
983 * Create Socket structure.
985 ret = snew(struct Socket_tag);
989 bufchain_init(&ret->output_data);
990 ret->writable = 0; /* to start with */
991 ret->sending_oob = 0;
993 ret->frozen_readable = 0;
994 ret->localhost_only = local_host_only;
995 ret->pending_error = 0;
996 ret->parent = ret->child = NULL;
1000 * Translate address_family from platform-independent constants
1001 * into local reality.
1003 address_family = (orig_address_family == ADDRTYPE_IPV4 ? AF_INET :
1005 orig_address_family == ADDRTYPE_IPV6 ? AF_INET6 :
1010 * Our default, if passed the `don't care' value
1011 * ADDRTYPE_UNSPEC, is to listen on IPv4. If IPv6 is supported,
1012 * we will also set up a second socket listening on IPv6, but
1013 * the v4 one is primary since that ought to work even on
1014 * non-v6-supporting systems.
1016 if (address_family == AF_UNSPEC) address_family = AF_INET;
1021 s = p_socket(address_family, SOCK_STREAM, 0);
1024 if (s == INVALID_SOCKET) {
1025 err = p_WSAGetLastError();
1026 ret->error = winsock_error_string(err);
1027 return (Socket) ret;
1032 p_setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (const char *)&on, sizeof(on));
1035 if (address_family == AF_INET6) {
1036 memset(&a6, 0, sizeof(a6));
1037 a6.sin6_family = AF_INET6;
1038 /* FIXME: srcaddr is ignored for IPv6, because I (SGT) don't
1039 * know how to do it. :-)
1040 * (jeroen:) saddr is specified as an address.. eg 2001:db8::1
1041 * Thus we need either a parser that understands [2001:db8::1]:80
1042 * style addresses and/or enhance this to understand hostnames too. */
1043 if (local_host_only)
1044 a6.sin6_addr = in6addr_loopback;
1046 a6.sin6_addr = in6addr_any;
1047 a6.sin6_port = p_htons(port);
1052 a.sin_family = AF_INET;
1055 * Bind to source address. First try an explicitly
1059 a.sin_addr.s_addr = p_inet_addr(srcaddr);
1060 if (a.sin_addr.s_addr != INADDR_NONE) {
1061 /* Override localhost_only with specified listen addr. */
1062 ret->localhost_only = ipv4_is_loopback(a.sin_addr);
1068 * ... and failing that, go with one of the standard ones.
1071 if (local_host_only)
1072 a.sin_addr.s_addr = p_htonl(INADDR_LOOPBACK);
1074 a.sin_addr.s_addr = p_htonl(INADDR_ANY);
1077 a.sin_port = p_htons((short)port);
1080 retcode = p_bind(s, (address_family == AF_INET6 ?
1081 (struct sockaddr *) &a6 :
1082 (struct sockaddr *) &a),
1084 AF_INET6 ? sizeof(a6) : sizeof(a)));
1086 retcode = p_bind(s, (struct sockaddr *) &a, sizeof(a));
1088 if (retcode != SOCKET_ERROR) {
1091 err = p_WSAGetLastError();
1096 ret->error = winsock_error_string(err);
1097 return (Socket) ret;
1101 if (p_listen(s, SOMAXCONN) == SOCKET_ERROR) {
1103 ret->error = winsock_error_string(err);
1104 return (Socket) ret;
1107 /* Set up a select mechanism. This could be an AsyncSelect on a
1108 * window, or an EventSelect on an event object. */
1109 errstr = do_select(s, 1);
1112 ret->error = errstr;
1113 return (Socket) ret;
1116 add234(sktree, ret);
1120 * If we were given ADDRTYPE_UNSPEC, we must also create an
1121 * IPv6 listening socket and link it to this one.
1123 if (address_family == AF_INET && orig_address_family == ADDRTYPE_UNSPEC) {
1124 Actual_Socket other;
1126 other = (Actual_Socket) sk_newlistener(srcaddr, port, plug,
1127 local_host_only, ADDRTYPE_IPV6);
1130 if (!other->error) {
1131 other->parent = ret;
1140 return (Socket) ret;
1143 static void sk_tcp_close(Socket sock)
1145 extern char *do_select(SOCKET skt, int startup);
1146 Actual_Socket s = (Actual_Socket) sock;
1149 sk_tcp_close((Socket)s->child);
1153 p_closesocket(s->s);
1155 sk_addr_free(s->addr);
1160 * The function which tries to send on a socket once it's deemed
1163 void try_send(Actual_Socket s)
1165 while (s->sending_oob || bufchain_size(&s->output_data) > 0) {
1169 int len, urgentflag;
1171 if (s->sending_oob) {
1172 urgentflag = MSG_OOB;
1173 len = s->sending_oob;
1177 bufchain_prefix(&s->output_data, &data, &len);
1179 nsent = p_send(s->s, data, len, urgentflag);
1180 noise_ultralight(nsent);
1182 err = (nsent < 0 ? p_WSAGetLastError() : 0);
1183 if ((err < WSABASEERR && nsent < 0) || err == WSAEWOULDBLOCK) {
1185 * Perfectly normal: we've sent all we can for the moment.
1187 * (Some WinSock send() implementations can return
1188 * <0 but leave no sensible error indication -
1189 * WSAGetLastError() is called but returns zero or
1190 * a small number - so we check that case and treat
1191 * it just like WSAEWOULDBLOCK.)
1193 s->writable = FALSE;
1195 } else if (nsent == 0 ||
1196 err == WSAECONNABORTED || err == WSAECONNRESET) {
1198 * If send() returns CONNABORTED or CONNRESET, we
1199 * unfortunately can't just call plug_closing(),
1200 * because it's quite likely that we're currently
1201 * _in_ a call from the code we'd be calling back
1202 * to, so we'd have to make half the SSH code
1203 * reentrant. Instead we flag a pending error on
1204 * the socket, to be dealt with (by calling
1205 * plug_closing()) at some suitable future moment.
1207 s->pending_error = err;
1210 /* We're inside the Windows frontend here, so we know
1211 * that the frontend handle is unnecessary. */
1212 logevent(NULL, winsock_error_string(err));
1213 fatalbox("%s", winsock_error_string(err));
1216 if (s->sending_oob) {
1218 memmove(s->oobdata, s->oobdata+nsent, len-nsent);
1219 s->sending_oob = len - nsent;
1224 bufchain_consume(&s->output_data, nsent);
1230 static int sk_tcp_write(Socket sock, const char *buf, int len)
1232 Actual_Socket s = (Actual_Socket) sock;
1235 * Add the data to the buffer list on the socket.
1237 bufchain_add(&s->output_data, buf, len);
1240 * Now try sending from the start of the buffer list.
1245 return bufchain_size(&s->output_data);
1248 static int sk_tcp_write_oob(Socket sock, const char *buf, int len)
1250 Actual_Socket s = (Actual_Socket) sock;
1253 * Replace the buffer list on the socket with the data.
1255 bufchain_clear(&s->output_data);
1256 assert(len <= sizeof(s->oobdata));
1257 memcpy(s->oobdata, buf, len);
1258 s->sending_oob = len;
1261 * Now try sending from the start of the buffer list.
1266 return s->sending_oob;
1269 int select_result(WPARAM wParam, LPARAM lParam)
1273 char buf[20480]; /* nice big buffer for plenty of speed */
1277 /* wParam is the socket itself */
1280 return 1; /* boggle */
1282 s = find234(sktree, (void *) wParam, cmpforsearch);
1284 return 1; /* boggle */
1286 if ((err = WSAGETSELECTERROR(lParam)) != 0) {
1288 * An error has occurred on this socket. Pass it to the
1292 plug_log(s->plug, 1, s->addr, s->port,
1293 winsock_error_string(err), err);
1294 while (s->addr && sk_nextaddr(s->addr)) {
1295 err = try_connect(s);
1299 return plug_closing(s->plug, winsock_error_string(err), err, 0);
1304 noise_ultralight(lParam);
1306 switch (WSAGETSELECTEVENT(lParam)) {
1308 s->connected = s->writable = 1;
1310 * Once a socket is connected, we can stop falling
1311 * back through the candidate addresses to connect
1315 sk_addr_free(s->addr);
1320 /* In the case the socket is still frozen, we don't even bother */
1322 s->frozen_readable = 1;
1327 * We have received data on the socket. For an oobinline
1328 * socket, this might be data _before_ an urgent pointer,
1329 * in which case we send it to the back end with type==1
1330 * (data prior to urgent).
1334 p_ioctlsocket(s->s, SIOCATMARK, &atmark);
1336 * Avoid checking the return value from ioctlsocket(),
1337 * on the grounds that some WinSock wrappers don't
1338 * support it. If it does nothing, we get atmark==1,
1339 * which is equivalent to `no OOB pending', so the
1340 * effect will be to non-OOB-ify any OOB data.
1345 ret = p_recv(s->s, buf, sizeof(buf), 0);
1346 noise_ultralight(ret);
1348 err = p_WSAGetLastError();
1349 if (err == WSAEWOULDBLOCK) {
1354 return plug_closing(s->plug, winsock_error_string(err), err,
1356 } else if (0 == ret) {
1357 return plug_closing(s->plug, NULL, 0, 0);
1359 return plug_receive(s->plug, atmark ? 0 : 1, buf, ret);
1364 * This will only happen on a non-oobinline socket. It
1365 * indicates that we can immediately perform an OOB read
1366 * and get back OOB data, which we will send to the back
1367 * end with type==2 (urgent data).
1369 ret = p_recv(s->s, buf, sizeof(buf), MSG_OOB);
1370 noise_ultralight(ret);
1372 char *str = (ret == 0 ? "Internal networking trouble" :
1373 winsock_error_string(p_WSAGetLastError()));
1374 /* We're inside the Windows frontend here, so we know
1375 * that the frontend handle is unnecessary. */
1376 logevent(NULL, str);
1377 fatalbox("%s", str);
1379 return plug_receive(s->plug, 2, buf, ret);
1384 int bufsize_before, bufsize_after;
1386 bufsize_before = s->sending_oob + bufchain_size(&s->output_data);
1388 bufsize_after = s->sending_oob + bufchain_size(&s->output_data);
1389 if (bufsize_after < bufsize_before)
1390 plug_sent(s->plug, bufsize_after);
1394 /* Signal a close on the socket. First read any outstanding data. */
1397 ret = p_recv(s->s, buf, sizeof(buf), 0);
1399 err = p_WSAGetLastError();
1400 if (err == WSAEWOULDBLOCK)
1402 return plug_closing(s->plug, winsock_error_string(err),
1406 open &= plug_receive(s->plug, 0, buf, ret);
1408 open &= plug_closing(s->plug, NULL, 0, 0);
1415 struct sockaddr_in isa;
1417 struct sockaddr_storage isa;
1419 int addrlen = sizeof(isa);
1420 SOCKET t; /* socket of connection */
1422 memset(&isa, 0, sizeof(isa));
1424 t = p_accept(s->s,(struct sockaddr *)&isa,&addrlen);
1425 if (t == INVALID_SOCKET)
1427 err = p_WSAGetLastError();
1428 if (err == WSATRY_AGAIN)
1432 if (isa.ss_family == AF_INET &&
1433 s->localhost_only &&
1434 !ipv4_is_local_addr(((struct sockaddr_in *)&isa)->sin_addr)) {
1436 if (s->localhost_only && !ipv4_is_local_addr(isa.sin_addr)) {
1438 p_closesocket(t); /* dodgy WinSock let nonlocal through */
1439 } else if (plug_accepting(s->plug, (void*)t)) {
1440 p_closesocket(t); /* denied or error */
1449 * Deal with socket errors detected in try_send().
1451 void net_pending_errors(void)
1457 * This might be a fiddly business, because it's just possible
1458 * that handling a pending error on one socket might cause
1459 * others to be closed. (I can't think of any reason this might
1460 * happen in current SSH implementation, but to maintain
1461 * generality of this network layer I'll assume the worst.)
1463 * So what we'll do is search the socket list for _one_ socket
1464 * with a pending error, and then handle it, and then search
1465 * the list again _from the beginning_. Repeat until we make a
1466 * pass with no socket errors present. That way we are
1467 * protected against the socket list changing under our feet.
1471 for (i = 0; (s = index234(sktree, i)) != NULL; i++) {
1472 if (s->pending_error) {
1474 * An error has occurred on this socket. Pass it to the
1477 plug_closing(s->plug,
1478 winsock_error_string(s->pending_error),
1479 s->pending_error, 0);
1487 * Each socket abstraction contains a `void *' private field in
1488 * which the client can keep state.
1490 static void sk_tcp_set_private_ptr(Socket sock, void *ptr)
1492 Actual_Socket s = (Actual_Socket) sock;
1493 s->private_ptr = ptr;
1496 static void *sk_tcp_get_private_ptr(Socket sock)
1498 Actual_Socket s = (Actual_Socket) sock;
1499 return s->private_ptr;
1503 * Special error values are returned from sk_namelookup and sk_new
1504 * if there's a problem. These functions extract an error message,
1505 * or return NULL if there's no problem.
1507 const char *sk_addr_error(SockAddr addr)
1511 static const char *sk_tcp_socket_error(Socket sock)
1513 Actual_Socket s = (Actual_Socket) sock;
1517 static void sk_tcp_set_frozen(Socket sock, int is_frozen)
1519 Actual_Socket s = (Actual_Socket) sock;
1520 if (s->frozen == is_frozen)
1522 s->frozen = is_frozen;
1525 if (s->frozen_readable) {
1527 p_recv(s->s, &c, 1, MSG_PEEK);
1530 s->frozen_readable = 0;
1534 * For Plink: enumerate all sockets currently active.
1536 SOCKET first_socket(int *state)
1540 s = index234(sktree, (*state)++);
1541 return s ? s->s : INVALID_SOCKET;
1544 SOCKET next_socket(int *state)
1546 Actual_Socket s = index234(sktree, (*state)++);
1547 return s ? s->s : INVALID_SOCKET;
1550 extern int socket_writable(SOCKET skt)
1552 Actual_Socket s = find234(sktree, (void *)skt, cmpforsearch);
1555 return bufchain_size(&s->output_data) > 0;
1560 int net_service_lookup(char *service)
1563 se = p_getservbyname(service, NULL);
1565 return p_ntohs(se->s_port);
1570 SockAddr platform_get_x11_unix_address(int displaynum, char **canonicalname)
1572 SockAddr ret = snew(struct SockAddr_tag);
1573 memset(ret, 0, sizeof(struct SockAddr_tag));
1574 ret->error = "unix sockets not supported on this platform";