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
;
93 /* address family this belongs to, AF_INET for IPv4, AF_INET6 for IPv6. */
95 unsigned long address
; /* Address IPv4 style. */
97 struct addrinfo
*ai
; /* Address IPv6 style. */
101 static tree234
*sktree
;
103 static int cmpfortree(void *av
, void *bv
)
105 Actual_Socket a
= (Actual_Socket
) av
, b
= (Actual_Socket
) bv
;
106 unsigned long as
= (unsigned long) a
->s
, bs
= (unsigned long) b
->s
;
114 static int cmpforsearch(void *av
, void *bv
)
116 Actual_Socket b
= (Actual_Socket
) bv
;
117 unsigned long as
= (unsigned long) av
, bs
= (unsigned long) b
->s
;
127 sktree
= newtree234(cmpfortree
);
130 void sk_cleanup(void)
136 for (i
= 0; (s
= index234(sktree
, i
)) != NULL
; i
++) {
142 char *winsock_error_string(int error
)
146 return "Network error: Permission denied";
148 return "Network error: Address already in use";
149 case WSAEADDRNOTAVAIL
:
150 return "Network error: Cannot assign requested address";
151 case WSAEAFNOSUPPORT
:
153 "Network error: Address family not supported by protocol family";
155 return "Network error: Operation already in progress";
156 case WSAECONNABORTED
:
157 return "Network error: Software caused connection abort";
158 case WSAECONNREFUSED
:
159 return "Network error: Connection refused";
161 return "Network error: Connection reset by peer";
162 case WSAEDESTADDRREQ
:
163 return "Network error: Destination address required";
165 return "Network error: Bad address";
167 return "Network error: Host is down";
168 case WSAEHOSTUNREACH
:
169 return "Network error: No route to host";
171 return "Network error: Operation now in progress";
173 return "Network error: Interrupted function call";
175 return "Network error: Invalid argument";
177 return "Network error: Socket is already connected";
179 return "Network error: Too many open files";
181 return "Network error: Message too long";
183 return "Network error: Network is down";
185 return "Network error: Network dropped connection on reset";
187 return "Network error: Network is unreachable";
189 return "Network error: No buffer space available";
191 return "Network error: Bad protocol option";
193 return "Network error: Socket is not connected";
195 return "Network error: Socket operation on non-socket";
197 return "Network error: Operation not supported";
198 case WSAEPFNOSUPPORT
:
199 return "Network error: Protocol family not supported";
201 return "Network error: Too many processes";
202 case WSAEPROTONOSUPPORT
:
203 return "Network error: Protocol not supported";
205 return "Network error: Protocol wrong type for socket";
207 return "Network error: Cannot send after socket shutdown";
208 case WSAESOCKTNOSUPPORT
:
209 return "Network error: Socket type not supported";
211 return "Network error: Connection timed out";
213 return "Network error: Resource temporarily unavailable";
215 return "Network error: Graceful shutdown in progress";
217 return "Unknown network error";
221 SockAddr
sk_namelookup(char *host
, char **canonicalname
)
223 SockAddr ret
= smalloc(sizeof(struct SockAddr_tag
));
225 struct hostent
*h
= NULL
;
228 /* Clear the structure and default to IPv4. */
229 memset(ret
, 0, sizeof(struct SockAddr_tag
));
230 ret
->family
= 0; /* We set this one when we have resolved the host. */
233 if ((a
= inet_addr(host
)) == (unsigned long) INADDR_NONE
) {
236 /* Try to get the getaddrinfo() function from wship6.dll */
237 /* This way one doesn't need to have IPv6 dll's to use PuTTY and
238 * it will fallback to IPv4. */
239 typedef int (CALLBACK
* FGETADDRINFO
) (const char *nodename
,
240 const char *servname
,
241 const struct addrinfo
*
243 struct addrinfo
** res
);
244 FGETADDRINFO fGetAddrInfo
= NULL
;
246 HINSTANCE dllWSHIP6
= LoadLibrary("wship6.dll");
248 fGetAddrInfo
= (FGETADDRINFO
) GetProcAddress(dllWSHIP6
,
252 * Use fGetAddrInfo when it's available (which usually also
253 * means IPv6 is installed...)
256 /*debug(("Resolving \"%s\" with getaddrinfo() (IPv4+IPv6 capable)...\n", host)); */
257 if (fGetAddrInfo(host
, NULL
, NULL
, &ret
->ai
) == 0)
258 ret
->family
= ret
->ai
->ai_family
;
263 * Otherwise use the IPv4-only gethostbyname...
264 * (NOTE: we don't use gethostbyname as a
267 if (ret
->family
== 0) {
268 /*debug(("Resolving \"%s\" with gethostbyname() (IPv4 only)...\n", host)); */
269 if ( (h
= gethostbyname(host
)) )
270 ret
->family
= AF_INET
;
273 /*debug(("Done resolving...(family is %d) AF_INET = %d, AF_INET6 = %d\n", ret->family, AF_INET, AF_INET6)); */
275 if (ret
->family
== 0) {
276 DWORD err
= WSAGetLastError();
277 ret
->error
= (err
== WSAENETDOWN ?
"Network is down" :
279 WSAHOST_NOT_FOUND ?
"Host does not exist" : err
280 == WSATRY_AGAIN ?
"Host not found" :
282 fGetAddrInfo ?
"getaddrinfo: unknown error" :
284 "gethostbyname: unknown error");
288 FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER
|
289 FORMAT_MESSAGE_FROM_SYSTEM
|
290 FORMAT_MESSAGE_IGNORE_INSERTS
, NULL
, err
,
291 MAKELANGID(LANG_NEUTRAL
, SUBLANG_DEFAULT
),
292 (LPTSTR
) & lpMsgBuf
, 0, NULL
);
293 /*debug(("Error %ld: %s (h=%lx)\n", err, lpMsgBuf, h)); */
294 /* Free the buffer. */
302 /* If we got an address info use that... */
304 typedef int (CALLBACK
* FGETNAMEINFO
)
305 (const struct sockaddr FAR
* sa
, socklen_t salen
,
306 char FAR
* host
, size_t hostlen
, char FAR
* serv
,
307 size_t servlen
, int flags
);
308 FGETNAMEINFO fGetNameInfo
= NULL
;
310 /* Are we in IPv4 fallback mode? */
311 /* We put the IPv4 address into the a variable so we can further-on use the IPv4 code... */
312 if (ret
->family
== AF_INET
)
314 (char *) &((SOCKADDR_IN
*) ret
->ai
->
315 ai_addr
)->sin_addr
, sizeof(a
));
317 /* Now let's find that canonicalname... */
320 (FGETNAMEINFO
) GetProcAddress(dllWSHIP6
,
323 ((struct sockaddr
*) ret
->ai
->ai_addr
,
325 AF_INET ?
sizeof(SOCKADDR_IN
) :
326 sizeof(SOCKADDR_IN6
), realhost
,
327 sizeof(realhost
), NULL
, 0, 0) != 0) {
328 strncpy(realhost
, host
, sizeof(realhost
));
332 /* We used the IPv4-only gethostbyname()... */
336 memcpy(&a
, h
->h_addr
, sizeof(a
));
337 /* This way we are always sure the h->h_name is valid :) */
338 strncpy(realhost
, h
->h_name
, sizeof(realhost
));
342 FreeLibrary(dllWSHIP6
);
346 * This must be a numeric IPv4 address because it caused a
347 * success return from inet_addr.
349 ret
->family
= AF_INET
;
350 strncpy(realhost
, host
, sizeof(realhost
));
352 ret
->address
= ntohl(a
);
353 realhost
[lenof(realhost
)-1] = '\0';
354 *canonicalname
= smalloc(1+strlen(realhost
));
355 strcpy(*canonicalname
, realhost
);
359 void sk_getaddr(SockAddr addr
, char *buf
, int buflen
)
362 if (addr
->family
== AF_INET
) {
365 a
.s_addr
= htonl(addr
->address
);
366 strncpy(buf
, inet_ntoa(a
), buflen
);
369 FIXME
; /* I don't know how to get a text form of an IPv6 address. */
374 int sk_addrtype(SockAddr addr
)
376 return (addr
->family
== AF_INET ? ADDRTYPE_IPV4
: ADDRTYPE_IPV6
);
379 void sk_addrcopy(SockAddr addr
, char *buf
)
382 if (addr
->family
== AF_INET
) {
385 a
.s_addr
= htonl(addr
->address
);
386 memcpy(buf
, (char*) &a
.s_addr
, 4);
389 memcpy(buf
, (char*) addr
->ai
, 16);
394 void sk_addr_free(SockAddr addr
)
399 static Plug
sk_tcp_plug(Socket sock
, Plug p
)
401 Actual_Socket s
= (Actual_Socket
) sock
;
408 static void sk_tcp_flush(Socket s
)
411 * We send data to the socket as soon as we can anyway,
412 * so we don't need to do anything here. :-)
416 static void sk_tcp_close(Socket s
);
417 static int sk_tcp_write(Socket s
, char *data
, int len
);
418 static int sk_tcp_write_oob(Socket s
, char *data
, int len
);
419 static void sk_tcp_set_private_ptr(Socket s
, void *ptr
);
420 static void *sk_tcp_get_private_ptr(Socket s
);
421 static void sk_tcp_set_frozen(Socket s
, int is_frozen
);
422 static char *sk_tcp_socket_error(Socket s
);
424 extern char *do_select(SOCKET skt
, int startup
);
426 Socket
sk_register(void *sock
, Plug plug
)
428 static struct socket_function_table fn_table
= {
434 sk_tcp_set_private_ptr
,
435 sk_tcp_get_private_ptr
,
445 * Create Socket structure.
447 ret
= smalloc(sizeof(struct Socket_tag
));
451 bufchain_init(&ret
->output_data
);
452 ret
->writable
= 1; /* to start with */
453 ret
->sending_oob
= 0;
455 ret
->frozen_readable
= 0;
456 ret
->localhost_only
= 0; /* unused, but best init anyway */
457 ret
->pending_error
= 0;
459 ret
->s
= (SOCKET
)sock
;
461 if (ret
->s
== INVALID_SOCKET
) {
462 err
= WSAGetLastError();
463 ret
->error
= winsock_error_string(err
);
469 /* Set up a select mechanism. This could be an AsyncSelect on a
470 * window, or an EventSelect on an event object. */
471 errstr
= do_select(ret
->s
, 1);
482 Socket
sk_new(SockAddr addr
, int port
, int privport
, int oobinline
,
483 int nodelay
, Plug plug
)
485 static struct socket_function_table fn_table
= {
491 sk_tcp_set_private_ptr
,
492 sk_tcp_get_private_ptr
,
508 * Create Socket structure.
510 ret
= smalloc(sizeof(struct Socket_tag
));
514 bufchain_init(&ret
->output_data
);
515 ret
->connected
= 0; /* to start with */
516 ret
->writable
= 0; /* to start with */
517 ret
->sending_oob
= 0;
519 ret
->frozen_readable
= 0;
520 ret
->localhost_only
= 0; /* unused, but best init anyway */
521 ret
->pending_error
= 0;
526 s
= socket(addr
->family
, SOCK_STREAM
, 0);
529 if (s
== INVALID_SOCKET
) {
530 err
= WSAGetLastError();
531 ret
->error
= winsock_error_string(err
);
535 ret
->oobinline
= oobinline
;
538 setsockopt(s
, SOL_SOCKET
, SO_OOBINLINE
, (void *) &b
, sizeof(b
));
543 setsockopt(s
, IPPROTO_TCP
, TCP_NODELAY
, (void *) &b
, sizeof(b
));
547 * Bind to local address.
550 localport
= 1023; /* count from 1023 downwards */
552 localport
= 0; /* just use port 0 (ie winsock picks) */
554 /* Loop round trying to bind */
559 if (addr
->family
== AF_INET6
) {
560 memset(&a6
, 0, sizeof(a6
));
561 a6
.sin6_family
= AF_INET6
;
562 /*a6.sin6_addr = in6addr_any; *//* == 0 */
563 a6
.sin6_port
= htons(localport
);
567 a
.sin_family
= AF_INET
;
568 a
.sin_addr
.s_addr
= htonl(INADDR_ANY
);
569 a
.sin_port
= htons(localport
);
572 retcode
= bind(s
, (addr
->family
== AF_INET6 ?
573 (struct sockaddr
*) &a6
:
574 (struct sockaddr
*) &a
),
576 AF_INET6 ?
sizeof(a6
) : sizeof(a
)));
578 retcode
= bind(s
, (struct sockaddr
*) &a
, sizeof(a
));
580 if (retcode
!= SOCKET_ERROR
) {
584 err
= WSAGetLastError();
585 if (err
!= WSAEADDRINUSE
) /* failed, for a bad reason */
590 break; /* we're only looping once */
593 break; /* we might have got to the end */
597 ret
->error
= winsock_error_string(err
);
602 * Connect to remote address.
605 if (addr
->family
== AF_INET6
) {
606 memset(&a
, 0, sizeof(a
));
607 a6
.sin6_family
= AF_INET6
;
608 a6
.sin6_port
= htons((short) port
);
610 ((struct sockaddr_in6
*) addr
->ai
->ai_addr
)->sin6_addr
;
614 a
.sin_family
= AF_INET
;
615 a
.sin_addr
.s_addr
= htonl(addr
->address
);
616 a
.sin_port
= htons((short) port
);
619 /* Set up a select mechanism. This could be an AsyncSelect on a
620 * window, or an EventSelect on an event object. */
621 errstr
= do_select(s
, 1);
629 connect(s
, ((addr
->family
== AF_INET6
) ?
630 (struct sockaddr
*) &a6
: (struct sockaddr
*) &a
),
631 (addr
->family
== AF_INET6
) ?
sizeof(a6
) : sizeof(a
))
633 connect(s
, (struct sockaddr
*) &a
, sizeof(a
))
636 err
= WSAGetLastError();
638 * We expect a potential EWOULDBLOCK here, because the
639 * chances are the front end has done a select for
640 * FD_CONNECT, so that connect() will complete
643 if ( err
!= WSAEWOULDBLOCK
) {
644 ret
->error
= winsock_error_string(err
);
649 * If we _don't_ get EWOULDBLOCK, the connect has completed
650 * and we should set the socket as writable.
660 Socket
sk_newlistener(char *srcaddr
, int port
, Plug plug
, int local_host_only
)
662 static struct socket_function_table fn_table
= {
668 sk_tcp_set_private_ptr
,
669 sk_tcp_get_private_ptr
,
686 * Create Socket structure.
688 ret
= smalloc(sizeof(struct Socket_tag
));
692 bufchain_init(&ret
->output_data
);
693 ret
->writable
= 0; /* to start with */
694 ret
->sending_oob
= 0;
696 ret
->frozen_readable
= 0;
697 ret
->localhost_only
= local_host_only
;
698 ret
->pending_error
= 0;
703 s
= socket(AF_INET
, SOCK_STREAM
, 0);
706 if (s
== INVALID_SOCKET
) {
707 err
= WSAGetLastError();
708 ret
->error
= winsock_error_string(err
);
715 setsockopt(s
, SOL_SOCKET
, SO_REUSEADDR
, (const char *)&on
, sizeof(on
));
719 if (addr
->family
== AF_INET6
) {
720 memset(&a6
, 0, sizeof(a6
));
721 a6
.sin6_family
= AF_INET6
;
722 /* FIXME: srcaddr is ignored for IPv6, because I (SGT) don't
723 * know how to do it. :-) */
725 a6
.sin6_addr
= in6addr_loopback
;
727 a6
.sin6_addr
= in6addr_any
;
728 a6
.sin6_port
= htons(port
);
733 a
.sin_family
= AF_INET
;
736 * Bind to source address. First try an explicitly
740 a
.sin_addr
.s_addr
= inet_addr(srcaddr
);
741 if (a
.sin_addr
.s_addr
!= INADDR_NONE
) {
742 /* Override localhost_only with specified listen addr. */
743 ret
->localhost_only
= ipv4_is_loopback(a
.sin_addr
);
749 * ... and failing that, go with one of the standard ones.
753 a
.sin_addr
.s_addr
= htonl(INADDR_LOOPBACK
);
755 a
.sin_addr
.s_addr
= htonl(INADDR_ANY
);
758 a
.sin_port
= htons((short)port
);
761 retcode
= bind(s
, (addr
->family
== AF_INET6 ?
762 (struct sockaddr
*) &a6
:
763 (struct sockaddr
*) &a
),
765 AF_INET6 ?
sizeof(a6
) : sizeof(a
)));
767 retcode
= bind(s
, (struct sockaddr
*) &a
, sizeof(a
));
769 if (retcode
!= SOCKET_ERROR
) {
772 err
= WSAGetLastError();
776 ret
->error
= winsock_error_string(err
);
781 if (listen(s
, SOMAXCONN
) == SOCKET_ERROR
) {
783 ret
->error
= winsock_error_string(err
);
787 /* Set up a select mechanism. This could be an AsyncSelect on a
788 * window, or an EventSelect on an event object. */
789 errstr
= do_select(s
, 1);
800 static void sk_tcp_close(Socket sock
)
802 extern char *do_select(SOCKET skt
, int startup
);
803 Actual_Socket s
= (Actual_Socket
) sock
;
812 * The function which tries to send on a socket once it's deemed
815 void try_send(Actual_Socket s
)
817 while (s
->sending_oob
|| bufchain_size(&s
->output_data
) > 0) {
823 if (s
->sending_oob
) {
824 urgentflag
= MSG_OOB
;
825 len
= s
->sending_oob
;
829 bufchain_prefix(&s
->output_data
, &data
, &len
);
831 nsent
= send(s
->s
, data
, len
, urgentflag
);
832 noise_ultralight(nsent
);
834 err
= (nsent
< 0 ?
WSAGetLastError() : 0);
835 if ((err
< WSABASEERR
&& nsent
< 0) || err
== WSAEWOULDBLOCK
) {
837 * Perfectly normal: we've sent all we can for the moment.
839 * (Some WinSock send() implementations can return
840 * <0 but leave no sensible error indication -
841 * WSAGetLastError() is called but returns zero or
842 * a small number - so we check that case and treat
843 * it just like WSAEWOULDBLOCK.)
847 } else if (nsent
== 0 ||
848 err
== WSAECONNABORTED
|| err
== WSAECONNRESET
) {
850 * If send() returns CONNABORTED or CONNRESET, we
851 * unfortunately can't just call plug_closing(),
852 * because it's quite likely that we're currently
853 * _in_ a call from the code we'd be calling back
854 * to, so we'd have to make half the SSH code
855 * reentrant. Instead we flag a pending error on
856 * the socket, to be dealt with (by calling
857 * plug_closing()) at some suitable future moment.
859 s
->pending_error
= err
;
862 /* We're inside the Windows frontend here, so we know
863 * that the frontend handle is unnecessary. */
864 logevent(NULL
, winsock_error_string(err
));
865 fatalbox("%s", winsock_error_string(err
));
868 if (s
->sending_oob
) {
870 memmove(s
->oobdata
, s
->oobdata
+nsent
, len
-nsent
);
871 s
->sending_oob
= len
- nsent
;
876 bufchain_consume(&s
->output_data
, nsent
);
882 static int sk_tcp_write(Socket sock
, char *buf
, int len
)
884 Actual_Socket s
= (Actual_Socket
) sock
;
887 * Add the data to the buffer list on the socket.
889 bufchain_add(&s
->output_data
, buf
, len
);
892 * Now try sending from the start of the buffer list.
897 return bufchain_size(&s
->output_data
);
900 static int sk_tcp_write_oob(Socket sock
, char *buf
, int len
)
902 Actual_Socket s
= (Actual_Socket
) sock
;
905 * Replace the buffer list on the socket with the data.
907 bufchain_clear(&s
->output_data
);
908 assert(len
<= sizeof(s
->oobdata
));
909 memcpy(s
->oobdata
, buf
, len
);
910 s
->sending_oob
= len
;
913 * Now try sending from the start of the buffer list.
918 return s
->sending_oob
;
921 int select_result(WPARAM wParam
, LPARAM lParam
)
925 char buf
[20480]; /* nice big buffer for plenty of speed */
929 /* wParam is the socket itself */
932 * One user has reported an assertion failure in tree234 which
933 * indicates a null element pointer has been passed to a
934 * find*234 function. The following find234 is the only one in
935 * the whole program that I can see being capable of doing
936 * this, hence I'm forced to conclude that WinSock is capable
937 * of sending me netevent messages with wParam==0. I want to
938 * know what the rest of the message is if it does so!
942 str
= dupprintf("Strange WinSock message: wp=%08x lp=%08x",
943 (int)wParam
, (int)lParam
);
945 connection_fatal(NULL
, str
);
949 s
= find234(sktree
, (void *) wParam
, cmpforsearch
);
951 return 1; /* boggle */
953 if ((err
= WSAGETSELECTERROR(lParam
)) != 0) {
955 * An error has occurred on this socket. Pass it to the
958 return plug_closing(s
->plug
, winsock_error_string(err
), err
, 0);
961 noise_ultralight(lParam
);
963 switch (WSAGETSELECTEVENT(lParam
)) {
965 s
->connected
= s
->writable
= 1;
968 /* In the case the socket is still frozen, we don't even bother */
970 s
->frozen_readable
= 1;
975 * We have received data on the socket. For an oobinline
976 * socket, this might be data _before_ an urgent pointer,
977 * in which case we send it to the back end with type==1
978 * (data prior to urgent).
982 ioctlsocket(s
->s
, SIOCATMARK
, &atmark
);
984 * Avoid checking the return value from ioctlsocket(),
985 * on the grounds that some WinSock wrappers don't
986 * support it. If it does nothing, we get atmark==1,
987 * which is equivalent to `no OOB pending', so the
988 * effect will be to non-OOB-ify any OOB data.
993 ret
= recv(s
->s
, buf
, sizeof(buf
), 0);
994 noise_ultralight(ret
);
996 err
= WSAGetLastError();
997 if (err
== WSAEWOULDBLOCK
) {
1002 return plug_closing(s
->plug
, winsock_error_string(err
), err
,
1004 } else if (0 == ret
) {
1005 return plug_closing(s
->plug
, NULL
, 0, 0);
1007 return plug_receive(s
->plug
, atmark ?
0 : 1, buf
, ret
);
1012 * This will only happen on a non-oobinline socket. It
1013 * indicates that we can immediately perform an OOB read
1014 * and get back OOB data, which we will send to the back
1015 * end with type==2 (urgent data).
1017 ret
= recv(s
->s
, buf
, sizeof(buf
), MSG_OOB
);
1018 noise_ultralight(ret
);
1020 char *str
= (ret
== 0 ?
"Internal networking trouble" :
1021 winsock_error_string(WSAGetLastError()));
1022 /* We're inside the Windows frontend here, so we know
1023 * that the frontend handle is unnecessary. */
1024 logevent(NULL
, str
);
1025 fatalbox("%s", str
);
1027 return plug_receive(s
->plug
, 2, buf
, ret
);
1032 int bufsize_before
, bufsize_after
;
1034 bufsize_before
= s
->sending_oob
+ bufchain_size(&s
->output_data
);
1036 bufsize_after
= s
->sending_oob
+ bufchain_size(&s
->output_data
);
1037 if (bufsize_after
< bufsize_before
)
1038 plug_sent(s
->plug
, bufsize_after
);
1042 /* Signal a close on the socket. First read any outstanding data. */
1045 ret
= recv(s
->s
, buf
, sizeof(buf
), 0);
1047 err
= WSAGetLastError();
1048 if (err
== WSAEWOULDBLOCK
)
1050 return plug_closing(s
->plug
, winsock_error_string(err
),
1054 open
&= plug_receive(s
->plug
, 0, buf
, ret
);
1056 open
&= plug_closing(s
->plug
, NULL
, 0, 0);
1062 struct sockaddr_in isa
;
1063 int addrlen
= sizeof(struct sockaddr_in
);
1064 SOCKET t
; /* socket of connection */
1066 memset(&isa
, 0, sizeof(struct sockaddr_in
));
1068 t
= accept(s
->s
,(struct sockaddr
*)&isa
,&addrlen
);
1069 if (t
== INVALID_SOCKET
)
1071 err
= WSAGetLastError();
1072 if (err
== WSATRY_AGAIN
)
1076 if (s
->localhost_only
&& !ipv4_is_loopback(isa
.sin_addr
)) {
1077 closesocket(t
); /* dodgy WinSock let nonlocal through */
1078 } else if (plug_accepting(s
->plug
, (void*)t
)) {
1079 closesocket(t
); /* denied or error */
1088 * Deal with socket errors detected in try_send().
1090 void net_pending_errors(void)
1096 * This might be a fiddly business, because it's just possible
1097 * that handling a pending error on one socket might cause
1098 * others to be closed. (I can't think of any reason this might
1099 * happen in current SSH implementation, but to maintain
1100 * generality of this network layer I'll assume the worst.)
1102 * So what we'll do is search the socket list for _one_ socket
1103 * with a pending error, and then handle it, and then search
1104 * the list again _from the beginning_. Repeat until we make a
1105 * pass with no socket errors present. That way we are
1106 * protected against the socket list changing under our feet.
1110 for (i
= 0; (s
= index234(sktree
, i
)) != NULL
; i
++) {
1111 if (s
->pending_error
) {
1113 * An error has occurred on this socket. Pass it to the
1116 plug_closing(s
->plug
,
1117 winsock_error_string(s
->pending_error
),
1118 s
->pending_error
, 0);
1126 * Each socket abstraction contains a `void *' private field in
1127 * which the client can keep state.
1129 static void sk_tcp_set_private_ptr(Socket sock
, void *ptr
)
1131 Actual_Socket s
= (Actual_Socket
) sock
;
1132 s
->private_ptr
= ptr
;
1135 static void *sk_tcp_get_private_ptr(Socket sock
)
1137 Actual_Socket s
= (Actual_Socket
) sock
;
1138 return s
->private_ptr
;
1142 * Special error values are returned from sk_namelookup and sk_new
1143 * if there's a problem. These functions extract an error message,
1144 * or return NULL if there's no problem.
1146 char *sk_addr_error(SockAddr addr
)
1150 static char *sk_tcp_socket_error(Socket sock
)
1152 Actual_Socket s
= (Actual_Socket
) sock
;
1156 static void sk_tcp_set_frozen(Socket sock
, int is_frozen
)
1158 Actual_Socket s
= (Actual_Socket
) sock
;
1159 if (s
->frozen
== is_frozen
)
1161 s
->frozen
= is_frozen
;
1162 if (!is_frozen
&& s
->frozen_readable
) {
1164 recv(s
->s
, &c
, 1, MSG_PEEK
);
1166 s
->frozen_readable
= 0;
1170 * For Plink: enumerate all sockets currently active.
1172 SOCKET
first_socket(int *state
)
1176 s
= index234(sktree
, (*state
)++);
1177 return s ? s
->s
: INVALID_SOCKET
;
1180 SOCKET
next_socket(int *state
)
1182 Actual_Socket s
= index234(sktree
, (*state
)++);
1183 return s ? s
->s
: INVALID_SOCKET
;
1186 int net_service_lookup(char *service
)
1189 se
= getservbyname(service
, NULL
);
1191 return ntohs(se
->s_port
);