2 * Windows networking abstraction.
4 * Due to this clean abstraction it was possible
5 * to easily implement IPv6 support :)
7 * IPv6 patch 1 (27 October 2000) Jeroen Massar <jeroen@unfix.org>
8 * - Preliminary hacked IPv6 support.
9 * - Connecting to IPv6 address (eg fec0:4242:4242:100:2d0:b7ff:fe8f:5d42) works.
10 * - Connecting to IPv6 hostname (eg heaven.ipv6.unfix.org) works.
11 * - Compiles as either IPv4 or IPv6.
13 * IPv6 patch 2 (29 October 2000) Jeroen Massar <jeroen@unfix.org>
14 * - When compiled as IPv6 it also allows connecting to IPv4 hosts.
15 * - Added some more documentation.
17 * IPv6 patch 3 (18 November 2000) Jeroen Massar <jeroen@unfix.org>
18 * - It now supports dynamically loading the IPv6 resolver dll's.
19 * This way we should be able to distribute one (1) binary
20 * which supports both IPv4 and IPv6.
21 * - getaddrinfo() and getnameinfo() are loaded dynamicaly if possible.
22 * - in6addr_any is defined in this file so we don't need to link to wship6.lib
23 * - The patch is now more unified so that we can still
24 * remove all IPv6 support by undef'ing IPV6.
25 * But where it fallsback to IPv4 it uses the IPv4 code which is already in place...
26 * - Canonical name resolving works.
28 * IPv6 patch 4 (07 January 2001) Jeroen Massar <jeroen@unfix.org>
29 * - patch against CVS of today, will be submitted to the bugs list
30 * as a 'cvs diff -u' on Simon's request...
35 * Define IPV6 to have IPv6 on-the-fly-loading support.
36 * This means that one doesn't have to have an IPv6 stack to use it.
37 * But if an IPv6 stack is found it is used with a fallback to IPv4.
53 #define DEFINE_PLUG_METHOD_MACROS
58 #define ipv4_is_loopback(addr) \
59 ((ntohl(addr.s_addr) & 0xFF000000L) == 0x7F000000L)
62 struct socket_function_table
*fn
;
63 /* the above variable absolutely *must* be the first in this structure */
71 int frozen
; /* this causes readability notifications to be ignored */
72 int frozen_readable
; /* this means we missed at least one readability
73 * notification while we were frozen */
74 int localhost_only
; /* for listening sockets */
78 int pending_error
; /* in case send() returns error */
82 * We used to typedef struct Socket_tag *Socket.
84 * Since we have made the networking abstraction slightly more
85 * abstract, Socket no longer means a tcp socket (it could mean
86 * an ssl socket). So now we must use Actual_Socket when we know
87 * we are talking about a tcp socket.
89 typedef struct Socket_tag
*Actual_Socket
;
94 * Which address family this address belongs to. AF_INET for
95 * IPv4; AF_INET6 for IPv6; AF_UNSPEC indicates that name
96 * resolution has not been done and a simple host name is held
97 * in this SockAddr structure.
100 unsigned long address
; /* Address IPv4 style. */
102 struct addrinfo
*ai
; /* Address IPv6 style. */
104 char hostname
[512]; /* Store an unresolved host name. */
107 static tree234
*sktree
;
109 static int cmpfortree(void *av
, void *bv
)
111 Actual_Socket a
= (Actual_Socket
) av
, b
= (Actual_Socket
) bv
;
112 unsigned long as
= (unsigned long) a
->s
, bs
= (unsigned long) b
->s
;
120 static int cmpforsearch(void *av
, void *bv
)
122 Actual_Socket b
= (Actual_Socket
) bv
;
123 unsigned long as
= (unsigned long) av
, bs
= (unsigned long) b
->s
;
133 sktree
= newtree234(cmpfortree
);
136 void sk_cleanup(void)
142 for (i
= 0; (s
= index234(sktree
, i
)) != NULL
; i
++) {
148 char *winsock_error_string(int error
)
152 return "Network error: Permission denied";
154 return "Network error: Address already in use";
155 case WSAEADDRNOTAVAIL
:
156 return "Network error: Cannot assign requested address";
157 case WSAEAFNOSUPPORT
:
159 "Network error: Address family not supported by protocol family";
161 return "Network error: Operation already in progress";
162 case WSAECONNABORTED
:
163 return "Network error: Software caused connection abort";
164 case WSAECONNREFUSED
:
165 return "Network error: Connection refused";
167 return "Network error: Connection reset by peer";
168 case WSAEDESTADDRREQ
:
169 return "Network error: Destination address required";
171 return "Network error: Bad address";
173 return "Network error: Host is down";
174 case WSAEHOSTUNREACH
:
175 return "Network error: No route to host";
177 return "Network error: Operation now in progress";
179 return "Network error: Interrupted function call";
181 return "Network error: Invalid argument";
183 return "Network error: Socket is already connected";
185 return "Network error: Too many open files";
187 return "Network error: Message too long";
189 return "Network error: Network is down";
191 return "Network error: Network dropped connection on reset";
193 return "Network error: Network is unreachable";
195 return "Network error: No buffer space available";
197 return "Network error: Bad protocol option";
199 return "Network error: Socket is not connected";
201 return "Network error: Socket operation on non-socket";
203 return "Network error: Operation not supported";
204 case WSAEPFNOSUPPORT
:
205 return "Network error: Protocol family not supported";
207 return "Network error: Too many processes";
208 case WSAEPROTONOSUPPORT
:
209 return "Network error: Protocol not supported";
211 return "Network error: Protocol wrong type for socket";
213 return "Network error: Cannot send after socket shutdown";
214 case WSAESOCKTNOSUPPORT
:
215 return "Network error: Socket type not supported";
217 return "Network error: Connection timed out";
219 return "Network error: Resource temporarily unavailable";
221 return "Network error: Graceful shutdown in progress";
223 return "Unknown network error";
227 SockAddr
sk_namelookup(char *host
, char **canonicalname
)
229 SockAddr ret
= smalloc(sizeof(struct SockAddr_tag
));
231 struct hostent
*h
= NULL
;
234 /* Clear the structure and default to IPv4. */
235 memset(ret
, 0, sizeof(struct SockAddr_tag
));
236 ret
->family
= 0; /* We set this one when we have resolved the host. */
239 if ((a
= inet_addr(host
)) == (unsigned long) INADDR_NONE
) {
242 /* Try to get the getaddrinfo() function from wship6.dll */
243 /* This way one doesn't need to have IPv6 dll's to use PuTTY and
244 * it will fallback to IPv4. */
245 typedef int (CALLBACK
* FGETADDRINFO
) (const char *nodename
,
246 const char *servname
,
247 const struct addrinfo
*
249 struct addrinfo
** res
);
250 FGETADDRINFO fGetAddrInfo
= NULL
;
252 HINSTANCE dllWSHIP6
= LoadLibrary("wship6.dll");
254 fGetAddrInfo
= (FGETADDRINFO
) GetProcAddress(dllWSHIP6
,
258 * Use fGetAddrInfo when it's available (which usually also
259 * means IPv6 is installed...)
262 /*debug(("Resolving \"%s\" with getaddrinfo() (IPv4+IPv6 capable)...\n", host)); */
263 if (fGetAddrInfo(host
, NULL
, NULL
, &ret
->ai
) == 0)
264 ret
->family
= ret
->ai
->ai_family
;
269 * Otherwise use the IPv4-only gethostbyname...
270 * (NOTE: we don't use gethostbyname as a
273 if (ret
->family
== 0) {
274 /*debug(("Resolving \"%s\" with gethostbyname() (IPv4 only)...\n", host)); */
275 if ( (h
= gethostbyname(host
)) )
276 ret
->family
= AF_INET
;
279 /*debug(("Done resolving...(family is %d) AF_INET = %d, AF_INET6 = %d\n", ret->family, AF_INET, AF_INET6)); */
281 if (ret
->family
== 0) {
282 DWORD err
= WSAGetLastError();
283 ret
->error
= (err
== WSAENETDOWN ?
"Network is down" :
285 WSAHOST_NOT_FOUND ?
"Host does not exist" : err
286 == WSATRY_AGAIN ?
"Host not found" :
288 fGetAddrInfo ?
"getaddrinfo: unknown error" :
290 "gethostbyname: unknown error");
294 FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER
|
295 FORMAT_MESSAGE_FROM_SYSTEM
|
296 FORMAT_MESSAGE_IGNORE_INSERTS
, NULL
, err
,
297 MAKELANGID(LANG_NEUTRAL
, SUBLANG_DEFAULT
),
298 (LPTSTR
) & lpMsgBuf
, 0, NULL
);
299 /*debug(("Error %ld: %s (h=%lx)\n", err, lpMsgBuf, h)); */
300 /* Free the buffer. */
308 /* If we got an address info use that... */
310 typedef int (CALLBACK
* FGETNAMEINFO
)
311 (const struct sockaddr FAR
* sa
, socklen_t salen
,
312 char FAR
* host
, size_t hostlen
, char FAR
* serv
,
313 size_t servlen
, int flags
);
314 FGETNAMEINFO fGetNameInfo
= NULL
;
316 /* Are we in IPv4 fallback mode? */
317 /* We put the IPv4 address into the a variable so we can further-on use the IPv4 code... */
318 if (ret
->family
== AF_INET
)
320 (char *) &((SOCKADDR_IN
*) ret
->ai
->
321 ai_addr
)->sin_addr
, sizeof(a
));
323 /* Now let's find that canonicalname... */
326 (FGETNAMEINFO
) GetProcAddress(dllWSHIP6
,
329 ((struct sockaddr
*) ret
->ai
->ai_addr
,
331 AF_INET ?
sizeof(SOCKADDR_IN
) :
332 sizeof(SOCKADDR_IN6
), realhost
,
333 sizeof(realhost
), NULL
, 0, 0) != 0) {
334 strncpy(realhost
, host
, sizeof(realhost
));
338 /* We used the IPv4-only gethostbyname()... */
342 memcpy(&a
, h
->h_addr
, sizeof(a
));
343 /* This way we are always sure the h->h_name is valid :) */
344 strncpy(realhost
, h
->h_name
, sizeof(realhost
));
348 FreeLibrary(dllWSHIP6
);
352 * This must be a numeric IPv4 address because it caused a
353 * success return from inet_addr.
355 ret
->family
= AF_INET
;
356 strncpy(realhost
, host
, sizeof(realhost
));
358 ret
->address
= ntohl(a
);
359 realhost
[lenof(realhost
)-1] = '\0';
360 *canonicalname
= smalloc(1+strlen(realhost
));
361 strcpy(*canonicalname
, realhost
);
365 SockAddr
sk_nonamelookup(char *host
)
367 SockAddr ret
= smalloc(sizeof(struct SockAddr_tag
));
369 ret
->family
= AF_UNSPEC
;
370 strncpy(ret
->hostname
, host
, lenof(ret
->hostname
));
371 ret
->hostname
[lenof(ret
->hostname
)-1] = '\0';
375 void sk_getaddr(SockAddr addr
, char *buf
, int buflen
)
378 if (addr
->family
== AF_INET6
) {
379 FIXME
; /* I don't know how to get a text form of an IPv6 address. */
382 if (addr
->family
== AF_INET
) {
384 a
.s_addr
= htonl(addr
->address
);
385 strncpy(buf
, inet_ntoa(a
), buflen
);
386 buf
[buflen
-1] = '\0';
388 assert(addr
->family
== AF_UNSPEC
);
389 strncpy(buf
, addr
->hostname
, buflen
);
390 buf
[buflen
-1] = '\0';
394 int sk_hostname_is_local(char *name
)
396 return !strcmp(name
, "localhost");
399 int sk_address_is_local(SockAddr addr
)
402 if (addr
->family
== AF_INET6
) {
403 FIXME
; /* someone who can compile for IPV6 had better do this bit */
406 if (addr
->family
== AF_INET
) {
408 a
.s_addr
= htonl(addr
->address
);
409 return ipv4_is_loopback(a
);
411 assert(addr
->family
== AF_UNSPEC
);
412 return 0; /* we don't know; assume not */
416 int sk_addrtype(SockAddr addr
)
418 return (addr
->family
== AF_INET ? ADDRTYPE_IPV4
:
420 addr
->family
== AF_INET6 ? ADDRTYPE_IPV6
:
425 void sk_addrcopy(SockAddr addr
, char *buf
)
427 assert(addr
->family
!= AF_UNSPEC
);
429 if (addr
->family
== AF_INET6
) {
430 memcpy(buf
, (char*) addr
->ai
, 16);
433 if (addr
->family
== AF_INET
) {
435 a
.s_addr
= htonl(addr
->address
);
436 memcpy(buf
, (char*) &a
.s_addr
, 4);
440 void sk_addr_free(SockAddr addr
)
445 static Plug
sk_tcp_plug(Socket sock
, Plug p
)
447 Actual_Socket s
= (Actual_Socket
) sock
;
454 static void sk_tcp_flush(Socket s
)
457 * We send data to the socket as soon as we can anyway,
458 * so we don't need to do anything here. :-)
462 static void sk_tcp_close(Socket s
);
463 static int sk_tcp_write(Socket s
, const char *data
, int len
);
464 static int sk_tcp_write_oob(Socket s
, const char *data
, int len
);
465 static void sk_tcp_set_private_ptr(Socket s
, void *ptr
);
466 static void *sk_tcp_get_private_ptr(Socket s
);
467 static void sk_tcp_set_frozen(Socket s
, int is_frozen
);
468 static char *sk_tcp_socket_error(Socket s
);
470 extern char *do_select(SOCKET skt
, int startup
);
472 Socket
sk_register(void *sock
, Plug plug
)
474 static struct socket_function_table fn_table
= {
480 sk_tcp_set_private_ptr
,
481 sk_tcp_get_private_ptr
,
491 * Create Socket structure.
493 ret
= smalloc(sizeof(struct Socket_tag
));
497 bufchain_init(&ret
->output_data
);
498 ret
->writable
= 1; /* to start with */
499 ret
->sending_oob
= 0;
501 ret
->frozen_readable
= 0;
502 ret
->localhost_only
= 0; /* unused, but best init anyway */
503 ret
->pending_error
= 0;
505 ret
->s
= (SOCKET
)sock
;
507 if (ret
->s
== INVALID_SOCKET
) {
508 err
= WSAGetLastError();
509 ret
->error
= winsock_error_string(err
);
515 /* Set up a select mechanism. This could be an AsyncSelect on a
516 * window, or an EventSelect on an event object. */
517 errstr
= do_select(ret
->s
, 1);
528 Socket
sk_new(SockAddr addr
, int port
, int privport
, int oobinline
,
529 int nodelay
, Plug plug
)
531 static struct socket_function_table fn_table
= {
537 sk_tcp_set_private_ptr
,
538 sk_tcp_get_private_ptr
,
554 * Create Socket structure.
556 ret
= smalloc(sizeof(struct Socket_tag
));
560 bufchain_init(&ret
->output_data
);
561 ret
->connected
= 0; /* to start with */
562 ret
->writable
= 0; /* to start with */
563 ret
->sending_oob
= 0;
565 ret
->frozen_readable
= 0;
566 ret
->localhost_only
= 0; /* unused, but best init anyway */
567 ret
->pending_error
= 0;
572 assert(addr
->family
!= AF_UNSPEC
);
573 s
= socket(addr
->family
, SOCK_STREAM
, 0);
576 if (s
== INVALID_SOCKET
) {
577 err
= WSAGetLastError();
578 ret
->error
= winsock_error_string(err
);
582 ret
->oobinline
= oobinline
;
585 setsockopt(s
, SOL_SOCKET
, SO_OOBINLINE
, (void *) &b
, sizeof(b
));
590 setsockopt(s
, IPPROTO_TCP
, TCP_NODELAY
, (void *) &b
, sizeof(b
));
594 * Bind to local address.
597 localport
= 1023; /* count from 1023 downwards */
599 localport
= 0; /* just use port 0 (ie winsock picks) */
601 /* Loop round trying to bind */
606 if (addr
->family
== AF_INET6
) {
607 memset(&a6
, 0, sizeof(a6
));
608 a6
.sin6_family
= AF_INET6
;
609 /*a6.sin6_addr = in6addr_any; *//* == 0 */
610 a6
.sin6_port
= htons(localport
);
614 a
.sin_family
= AF_INET
;
615 a
.sin_addr
.s_addr
= htonl(INADDR_ANY
);
616 a
.sin_port
= htons(localport
);
619 retcode
= bind(s
, (addr
->family
== AF_INET6 ?
620 (struct sockaddr
*) &a6
:
621 (struct sockaddr
*) &a
),
623 AF_INET6 ?
sizeof(a6
) : sizeof(a
)));
625 retcode
= bind(s
, (struct sockaddr
*) &a
, sizeof(a
));
627 if (retcode
!= SOCKET_ERROR
) {
631 err
= WSAGetLastError();
632 if (err
!= WSAEADDRINUSE
) /* failed, for a bad reason */
637 break; /* we're only looping once */
640 break; /* we might have got to the end */
644 ret
->error
= winsock_error_string(err
);
649 * Connect to remote address.
652 if (addr
->family
== AF_INET6
) {
653 memset(&a
, 0, sizeof(a
));
654 a6
.sin6_family
= AF_INET6
;
655 a6
.sin6_port
= htons((short) port
);
657 ((struct sockaddr_in6
*) addr
->ai
->ai_addr
)->sin6_addr
;
661 a
.sin_family
= AF_INET
;
662 a
.sin_addr
.s_addr
= htonl(addr
->address
);
663 a
.sin_port
= htons((short) port
);
666 /* Set up a select mechanism. This could be an AsyncSelect on a
667 * window, or an EventSelect on an event object. */
668 errstr
= do_select(s
, 1);
676 connect(s
, ((addr
->family
== AF_INET6
) ?
677 (struct sockaddr
*) &a6
: (struct sockaddr
*) &a
),
678 (addr
->family
== AF_INET6
) ?
sizeof(a6
) : sizeof(a
))
680 connect(s
, (struct sockaddr
*) &a
, sizeof(a
))
683 err
= WSAGetLastError();
685 * We expect a potential EWOULDBLOCK here, because the
686 * chances are the front end has done a select for
687 * FD_CONNECT, so that connect() will complete
690 if ( err
!= WSAEWOULDBLOCK
) {
691 ret
->error
= winsock_error_string(err
);
696 * If we _don't_ get EWOULDBLOCK, the connect has completed
697 * and we should set the socket as writable.
707 Socket
sk_newlistener(char *srcaddr
, int port
, Plug plug
, int local_host_only
)
709 static struct socket_function_table fn_table
= {
715 sk_tcp_set_private_ptr
,
716 sk_tcp_get_private_ptr
,
733 * Create Socket structure.
735 ret
= smalloc(sizeof(struct Socket_tag
));
739 bufchain_init(&ret
->output_data
);
740 ret
->writable
= 0; /* to start with */
741 ret
->sending_oob
= 0;
743 ret
->frozen_readable
= 0;
744 ret
->localhost_only
= local_host_only
;
745 ret
->pending_error
= 0;
750 s
= socket(AF_INET
, SOCK_STREAM
, 0);
753 if (s
== INVALID_SOCKET
) {
754 err
= WSAGetLastError();
755 ret
->error
= winsock_error_string(err
);
761 setsockopt(s
, SOL_SOCKET
, SO_REUSEADDR
, (const char *)&on
, sizeof(on
));
764 if (addr
->family
== AF_INET6
) {
765 memset(&a6
, 0, sizeof(a6
));
766 a6
.sin6_family
= AF_INET6
;
767 /* FIXME: srcaddr is ignored for IPv6, because I (SGT) don't
768 * know how to do it. :-) */
770 a6
.sin6_addr
= in6addr_loopback
;
772 a6
.sin6_addr
= in6addr_any
;
773 a6
.sin6_port
= htons(port
);
778 a
.sin_family
= AF_INET
;
781 * Bind to source address. First try an explicitly
785 a
.sin_addr
.s_addr
= inet_addr(srcaddr
);
786 if (a
.sin_addr
.s_addr
!= INADDR_NONE
) {
787 /* Override localhost_only with specified listen addr. */
788 ret
->localhost_only
= ipv4_is_loopback(a
.sin_addr
);
794 * ... and failing that, go with one of the standard ones.
798 a
.sin_addr
.s_addr
= htonl(INADDR_LOOPBACK
);
800 a
.sin_addr
.s_addr
= htonl(INADDR_ANY
);
803 a
.sin_port
= htons((short)port
);
806 retcode
= bind(s
, (addr
->family
== AF_INET6 ?
807 (struct sockaddr
*) &a6
:
808 (struct sockaddr
*) &a
),
810 AF_INET6 ?
sizeof(a6
) : sizeof(a
)));
812 retcode
= bind(s
, (struct sockaddr
*) &a
, sizeof(a
));
814 if (retcode
!= SOCKET_ERROR
) {
817 err
= WSAGetLastError();
821 ret
->error
= winsock_error_string(err
);
826 if (listen(s
, SOMAXCONN
) == SOCKET_ERROR
) {
828 ret
->error
= winsock_error_string(err
);
832 /* Set up a select mechanism. This could be an AsyncSelect on a
833 * window, or an EventSelect on an event object. */
834 errstr
= do_select(s
, 1);
845 static void sk_tcp_close(Socket sock
)
847 extern char *do_select(SOCKET skt
, int startup
);
848 Actual_Socket s
= (Actual_Socket
) sock
;
857 * The function which tries to send on a socket once it's deemed
860 void try_send(Actual_Socket s
)
862 while (s
->sending_oob
|| bufchain_size(&s
->output_data
) > 0) {
868 if (s
->sending_oob
) {
869 urgentflag
= MSG_OOB
;
870 len
= s
->sending_oob
;
874 bufchain_prefix(&s
->output_data
, &data
, &len
);
876 nsent
= send(s
->s
, data
, len
, urgentflag
);
877 noise_ultralight(nsent
);
879 err
= (nsent
< 0 ?
WSAGetLastError() : 0);
880 if ((err
< WSABASEERR
&& nsent
< 0) || err
== WSAEWOULDBLOCK
) {
882 * Perfectly normal: we've sent all we can for the moment.
884 * (Some WinSock send() implementations can return
885 * <0 but leave no sensible error indication -
886 * WSAGetLastError() is called but returns zero or
887 * a small number - so we check that case and treat
888 * it just like WSAEWOULDBLOCK.)
892 } else if (nsent
== 0 ||
893 err
== WSAECONNABORTED
|| err
== WSAECONNRESET
) {
895 * If send() returns CONNABORTED or CONNRESET, we
896 * unfortunately can't just call plug_closing(),
897 * because it's quite likely that we're currently
898 * _in_ a call from the code we'd be calling back
899 * to, so we'd have to make half the SSH code
900 * reentrant. Instead we flag a pending error on
901 * the socket, to be dealt with (by calling
902 * plug_closing()) at some suitable future moment.
904 s
->pending_error
= err
;
907 /* We're inside the Windows frontend here, so we know
908 * that the frontend handle is unnecessary. */
909 logevent(NULL
, winsock_error_string(err
));
910 fatalbox("%s", winsock_error_string(err
));
913 if (s
->sending_oob
) {
915 memmove(s
->oobdata
, s
->oobdata
+nsent
, len
-nsent
);
916 s
->sending_oob
= len
- nsent
;
921 bufchain_consume(&s
->output_data
, nsent
);
927 static int sk_tcp_write(Socket sock
, const char *buf
, int len
)
929 Actual_Socket s
= (Actual_Socket
) sock
;
932 * Add the data to the buffer list on the socket.
934 bufchain_add(&s
->output_data
, buf
, len
);
937 * Now try sending from the start of the buffer list.
942 return bufchain_size(&s
->output_data
);
945 static int sk_tcp_write_oob(Socket sock
, const char *buf
, int len
)
947 Actual_Socket s
= (Actual_Socket
) sock
;
950 * Replace the buffer list on the socket with the data.
952 bufchain_clear(&s
->output_data
);
953 assert(len
<= sizeof(s
->oobdata
));
954 memcpy(s
->oobdata
, buf
, len
);
955 s
->sending_oob
= len
;
958 * Now try sending from the start of the buffer list.
963 return s
->sending_oob
;
966 int select_result(WPARAM wParam
, LPARAM lParam
)
970 char buf
[20480]; /* nice big buffer for plenty of speed */
974 /* wParam is the socket itself */
977 return 1; /* boggle */
979 s
= find234(sktree
, (void *) wParam
, cmpforsearch
);
981 return 1; /* boggle */
983 if ((err
= WSAGETSELECTERROR(lParam
)) != 0) {
985 * An error has occurred on this socket. Pass it to the
988 return plug_closing(s
->plug
, winsock_error_string(err
), err
, 0);
991 noise_ultralight(lParam
);
993 switch (WSAGETSELECTEVENT(lParam
)) {
995 s
->connected
= s
->writable
= 1;
998 /* In the case the socket is still frozen, we don't even bother */
1000 s
->frozen_readable
= 1;
1005 * We have received data on the socket. For an oobinline
1006 * socket, this might be data _before_ an urgent pointer,
1007 * in which case we send it to the back end with type==1
1008 * (data prior to urgent).
1012 ioctlsocket(s
->s
, SIOCATMARK
, &atmark
);
1014 * Avoid checking the return value from ioctlsocket(),
1015 * on the grounds that some WinSock wrappers don't
1016 * support it. If it does nothing, we get atmark==1,
1017 * which is equivalent to `no OOB pending', so the
1018 * effect will be to non-OOB-ify any OOB data.
1023 ret
= recv(s
->s
, buf
, sizeof(buf
), 0);
1024 noise_ultralight(ret
);
1026 err
= WSAGetLastError();
1027 if (err
== WSAEWOULDBLOCK
) {
1032 return plug_closing(s
->plug
, winsock_error_string(err
), err
,
1034 } else if (0 == ret
) {
1035 return plug_closing(s
->plug
, NULL
, 0, 0);
1037 return plug_receive(s
->plug
, atmark ?
0 : 1, buf
, ret
);
1042 * This will only happen on a non-oobinline socket. It
1043 * indicates that we can immediately perform an OOB read
1044 * and get back OOB data, which we will send to the back
1045 * end with type==2 (urgent data).
1047 ret
= recv(s
->s
, buf
, sizeof(buf
), MSG_OOB
);
1048 noise_ultralight(ret
);
1050 char *str
= (ret
== 0 ?
"Internal networking trouble" :
1051 winsock_error_string(WSAGetLastError()));
1052 /* We're inside the Windows frontend here, so we know
1053 * that the frontend handle is unnecessary. */
1054 logevent(NULL
, str
);
1055 fatalbox("%s", str
);
1057 return plug_receive(s
->plug
, 2, buf
, ret
);
1062 int bufsize_before
, bufsize_after
;
1064 bufsize_before
= s
->sending_oob
+ bufchain_size(&s
->output_data
);
1066 bufsize_after
= s
->sending_oob
+ bufchain_size(&s
->output_data
);
1067 if (bufsize_after
< bufsize_before
)
1068 plug_sent(s
->plug
, bufsize_after
);
1072 /* Signal a close on the socket. First read any outstanding data. */
1075 ret
= recv(s
->s
, buf
, sizeof(buf
), 0);
1077 err
= WSAGetLastError();
1078 if (err
== WSAEWOULDBLOCK
)
1080 return plug_closing(s
->plug
, winsock_error_string(err
),
1084 open
&= plug_receive(s
->plug
, 0, buf
, ret
);
1086 open
&= plug_closing(s
->plug
, NULL
, 0, 0);
1092 struct sockaddr_in isa
;
1093 int addrlen
= sizeof(struct sockaddr_in
);
1094 SOCKET t
; /* socket of connection */
1096 memset(&isa
, 0, sizeof(struct sockaddr_in
));
1098 t
= accept(s
->s
,(struct sockaddr
*)&isa
,&addrlen
);
1099 if (t
== INVALID_SOCKET
)
1101 err
= WSAGetLastError();
1102 if (err
== WSATRY_AGAIN
)
1106 if (s
->localhost_only
&& !ipv4_is_loopback(isa
.sin_addr
)) {
1107 closesocket(t
); /* dodgy WinSock let nonlocal through */
1108 } else if (plug_accepting(s
->plug
, (void*)t
)) {
1109 closesocket(t
); /* denied or error */
1118 * Deal with socket errors detected in try_send().
1120 void net_pending_errors(void)
1126 * This might be a fiddly business, because it's just possible
1127 * that handling a pending error on one socket might cause
1128 * others to be closed. (I can't think of any reason this might
1129 * happen in current SSH implementation, but to maintain
1130 * generality of this network layer I'll assume the worst.)
1132 * So what we'll do is search the socket list for _one_ socket
1133 * with a pending error, and then handle it, and then search
1134 * the list again _from the beginning_. Repeat until we make a
1135 * pass with no socket errors present. That way we are
1136 * protected against the socket list changing under our feet.
1140 for (i
= 0; (s
= index234(sktree
, i
)) != NULL
; i
++) {
1141 if (s
->pending_error
) {
1143 * An error has occurred on this socket. Pass it to the
1146 plug_closing(s
->plug
,
1147 winsock_error_string(s
->pending_error
),
1148 s
->pending_error
, 0);
1156 * Each socket abstraction contains a `void *' private field in
1157 * which the client can keep state.
1159 static void sk_tcp_set_private_ptr(Socket sock
, void *ptr
)
1161 Actual_Socket s
= (Actual_Socket
) sock
;
1162 s
->private_ptr
= ptr
;
1165 static void *sk_tcp_get_private_ptr(Socket sock
)
1167 Actual_Socket s
= (Actual_Socket
) sock
;
1168 return s
->private_ptr
;
1172 * Special error values are returned from sk_namelookup and sk_new
1173 * if there's a problem. These functions extract an error message,
1174 * or return NULL if there's no problem.
1176 char *sk_addr_error(SockAddr addr
)
1180 static char *sk_tcp_socket_error(Socket sock
)
1182 Actual_Socket s
= (Actual_Socket
) sock
;
1186 static void sk_tcp_set_frozen(Socket sock
, int is_frozen
)
1188 Actual_Socket s
= (Actual_Socket
) sock
;
1189 if (s
->frozen
== is_frozen
)
1191 s
->frozen
= is_frozen
;
1192 if (!is_frozen
&& s
->frozen_readable
) {
1194 recv(s
->s
, &c
, 1, MSG_PEEK
);
1196 s
->frozen_readable
= 0;
1200 * For Plink: enumerate all sockets currently active.
1202 SOCKET
first_socket(int *state
)
1206 s
= index234(sktree
, (*state
)++);
1207 return s ? s
->s
: INVALID_SOCKET
;
1210 SOCKET
next_socket(int *state
)
1212 Actual_Socket s
= index234(sktree
, (*state
)++);
1213 return s ? s
->s
: INVALID_SOCKET
;
1216 int net_service_lookup(char *service
)
1219 se
= getservbyname(service
, NULL
);
1221 return ntohs(se
->s_port
);