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
59 struct socket_function_table
*fn
;
60 /* the above variable absolutely *must* be the first in this structure */
68 int frozen
; /* this causes readability notifications to be ignored */
69 int frozen_readable
; /* this means we missed at least one readability
70 * notification while we were frozen */
71 int localhost_only
; /* for listening sockets */
75 int pending_error
; /* in case send() returns error */
79 * We used to typedef struct Socket_tag *Socket.
81 * Since we have made the networking abstraction slightly more
82 * abstract, Socket no longer means a tcp socket (it could mean
83 * an ssl socket). So now we must use Actual_Socket when we know
84 * we are talking about a tcp socket.
86 typedef struct Socket_tag
*Actual_Socket
;
90 /* address family this belongs to, AF_INET for IPv4, AF_INET6 for IPv6. */
92 unsigned long address
; /* Address IPv4 style. */
94 struct addrinfo
*ai
; /* Address IPv6 style. */
98 static tree234
*sktree
;
100 static int cmpfortree(void *av
, void *bv
)
102 Actual_Socket a
= (Actual_Socket
) av
, b
= (Actual_Socket
) bv
;
103 unsigned long as
= (unsigned long) a
->s
, bs
= (unsigned long) b
->s
;
111 static int cmpforsearch(void *av
, void *bv
)
113 Actual_Socket b
= (Actual_Socket
) bv
;
114 unsigned long as
= (unsigned long) av
, bs
= (unsigned long) b
->s
;
124 sktree
= newtree234(cmpfortree
);
127 void sk_cleanup(void)
133 for (i
= 0; (s
= index234(sktree
, i
)) != NULL
; i
++) {
139 char *winsock_error_string(int error
)
143 return "Network error: Permission denied";
145 return "Network error: Address already in use";
146 case WSAEADDRNOTAVAIL
:
147 return "Network error: Cannot assign requested address";
148 case WSAEAFNOSUPPORT
:
150 "Network error: Address family not supported by protocol family";
152 return "Network error: Operation already in progress";
153 case WSAECONNABORTED
:
154 return "Network error: Software caused connection abort";
155 case WSAECONNREFUSED
:
156 return "Network error: Connection refused";
158 return "Network error: Connection reset by peer";
159 case WSAEDESTADDRREQ
:
160 return "Network error: Destination address required";
162 return "Network error: Bad address";
164 return "Network error: Host is down";
165 case WSAEHOSTUNREACH
:
166 return "Network error: No route to host";
168 return "Network error: Operation now in progress";
170 return "Network error: Interrupted function call";
172 return "Network error: Invalid argument";
174 return "Network error: Socket is already connected";
176 return "Network error: Too many open files";
178 return "Network error: Message too long";
180 return "Network error: Network is down";
182 return "Network error: Network dropped connection on reset";
184 return "Network error: Network is unreachable";
186 return "Network error: No buffer space available";
188 return "Network error: Bad protocol option";
190 return "Network error: Socket is not connected";
192 return "Network error: Socket operation on non-socket";
194 return "Network error: Operation not supported";
195 case WSAEPFNOSUPPORT
:
196 return "Network error: Protocol family not supported";
198 return "Network error: Too many processes";
199 case WSAEPROTONOSUPPORT
:
200 return "Network error: Protocol not supported";
202 return "Network error: Protocol wrong type for socket";
204 return "Network error: Cannot send after socket shutdown";
205 case WSAESOCKTNOSUPPORT
:
206 return "Network error: Socket type not supported";
208 return "Network error: Connection timed out";
210 return "Network error: Resource temporarily unavailable";
212 return "Network error: Graceful shutdown in progress";
214 return "Unknown network error";
218 SockAddr
sk_namelookup(char *host
, char **canonicalname
)
220 SockAddr ret
= smalloc(sizeof(struct SockAddr_tag
));
222 struct hostent
*h
= NULL
;
225 /* Clear the structure and default to IPv4. */
226 memset(ret
, 0, sizeof(struct SockAddr_tag
));
227 ret
->family
= 0; /* We set this one when we have resolved the host. */
230 if ((a
= inet_addr(host
)) == (unsigned long) INADDR_NONE
) {
233 /* Try to get the getaddrinfo() function from wship6.dll */
234 /* This way one doesn't need to have IPv6 dll's to use PuTTY and
235 * it will fallback to IPv4. */
236 typedef int (CALLBACK
* FGETADDRINFO
) (const char *nodename
,
237 const char *servname
,
238 const struct addrinfo
*
240 struct addrinfo
** res
);
241 FGETADDRINFO fGetAddrInfo
= NULL
;
243 HINSTANCE dllWSHIP6
= LoadLibrary("wship6.dll");
245 fGetAddrInfo
= (FGETADDRINFO
) GetProcAddress(dllWSHIP6
,
249 * Use fGetAddrInfo when it's available (which usually also
250 * means IPv6 is installed...)
253 /*debug(("Resolving \"%s\" with getaddrinfo() (IPv4+IPv6 capable)...\n", host)); */
254 if (fGetAddrInfo(host
, NULL
, NULL
, &ret
->ai
) == 0)
255 ret
->family
= ret
->ai
->ai_family
;
260 * Otherwise use the IPv4-only gethostbyname...
261 * (NOTE: we don't use gethostbyname as a
264 if (ret
->family
== 0) {
265 /*debug(("Resolving \"%s\" with gethostbyname() (IPv4 only)...\n", host)); */
266 if ( (h
= gethostbyname(host
)) )
267 ret
->family
= AF_INET
;
270 /*debug(("Done resolving...(family is %d) AF_INET = %d, AF_INET6 = %d\n", ret->family, AF_INET, AF_INET6)); */
272 if (ret
->family
== 0) {
273 DWORD err
= WSAGetLastError();
274 ret
->error
= (err
== WSAENETDOWN ?
"Network is down" :
276 WSAHOST_NOT_FOUND ?
"Host does not exist" : err
277 == WSATRY_AGAIN ?
"Host not found" :
279 fGetAddrInfo ?
"getaddrinfo: unknown error" :
281 "gethostbyname: unknown error");
285 FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER
|
286 FORMAT_MESSAGE_FROM_SYSTEM
|
287 FORMAT_MESSAGE_IGNORE_INSERTS
, NULL
, err
,
288 MAKELANGID(LANG_NEUTRAL
, SUBLANG_DEFAULT
),
289 (LPTSTR
) & lpMsgBuf
, 0, NULL
);
290 /*debug(("Error %ld: %s (h=%lx)\n", err, lpMsgBuf, h)); */
291 /* Free the buffer. */
299 /* If we got an address info use that... */
301 typedef int (CALLBACK
* FGETNAMEINFO
)
302 (const struct sockaddr FAR
* sa
, socklen_t salen
,
303 char FAR
* host
, size_t hostlen
, char FAR
* serv
,
304 size_t servlen
, int flags
);
305 FGETNAMEINFO fGetNameInfo
= NULL
;
307 /* Are we in IPv4 fallback mode? */
308 /* We put the IPv4 address into the a variable so we can further-on use the IPv4 code... */
309 if (ret
->family
== AF_INET
)
311 (char *) &((SOCKADDR_IN
*) ret
->ai
->
312 ai_addr
)->sin_addr
, sizeof(a
));
314 /* Now let's find that canonicalname... */
317 (FGETNAMEINFO
) GetProcAddress(dllWSHIP6
,
320 ((struct sockaddr
*) ret
->ai
->ai_addr
,
322 AF_INET ?
sizeof(SOCKADDR_IN
) :
323 sizeof(SOCKADDR_IN6
), realhost
,
324 sizeof(realhost
), NULL
, 0, 0) != 0) {
325 strncpy(realhost
, host
, sizeof(realhost
));
329 /* We used the IPv4-only gethostbyname()... */
333 memcpy(&a
, h
->h_addr
, sizeof(a
));
334 /* This way we are always sure the h->h_name is valid :) */
335 strncpy(realhost
, h
->h_name
, sizeof(realhost
));
339 FreeLibrary(dllWSHIP6
);
343 * This must be a numeric IPv4 address because it caused a
344 * success return from inet_addr.
346 ret
->family
= AF_INET
;
347 strncpy(realhost
, host
, sizeof(realhost
));
349 ret
->address
= ntohl(a
);
350 realhost
[lenof(realhost
)-1] = '\0';
351 *canonicalname
= smalloc(1+strlen(realhost
));
352 strcpy(*canonicalname
, realhost
);
356 void sk_getaddr(SockAddr addr
, char *buf
, int buflen
)
359 if (addr
->family
== AF_INET
) {
362 a
.s_addr
= htonl(addr
->address
);
363 strncpy(buf
, inet_ntoa(a
), buflen
);
366 FIXME
; /* I don't know how to get a text form of an IPv6 address. */
371 void sk_addr_free(SockAddr addr
)
376 static Plug
sk_tcp_plug(Socket sock
, Plug p
)
378 Actual_Socket s
= (Actual_Socket
) sock
;
385 static void sk_tcp_flush(Socket s
)
388 * We send data to the socket as soon as we can anyway,
389 * so we don't need to do anything here. :-)
393 static void sk_tcp_close(Socket s
);
394 static int sk_tcp_write(Socket s
, char *data
, int len
);
395 static int sk_tcp_write_oob(Socket s
, char *data
, int len
);
396 static char *sk_tcp_socket_error(Socket s
);
398 extern char *do_select(SOCKET skt
, int startup
);
400 Socket
sk_register(void *sock
, Plug plug
)
402 static struct socket_function_table fn_table
= {
416 * Create Socket structure.
418 ret
= smalloc(sizeof(struct Socket_tag
));
422 bufchain_init(&ret
->output_data
);
423 ret
->writable
= 1; /* to start with */
424 ret
->sending_oob
= 0;
426 ret
->frozen_readable
= 0;
427 ret
->localhost_only
= 0; /* unused, but best init anyway */
428 ret
->pending_error
= 0;
430 ret
->s
= (SOCKET
)sock
;
432 if (ret
->s
== INVALID_SOCKET
) {
433 err
= WSAGetLastError();
434 ret
->error
= winsock_error_string(err
);
440 /* Set up a select mechanism. This could be an AsyncSelect on a
441 * window, or an EventSelect on an event object. */
442 errstr
= do_select(ret
->s
, 1);
453 Socket
sk_new(SockAddr addr
, int port
, int privport
, int oobinline
,
454 int nodelay
, Plug plug
)
456 static struct socket_function_table fn_table
= {
476 * Create Socket structure.
478 ret
= smalloc(sizeof(struct Socket_tag
));
482 bufchain_init(&ret
->output_data
);
483 ret
->connected
= 0; /* to start with */
484 ret
->writable
= 0; /* to start with */
485 ret
->sending_oob
= 0;
487 ret
->frozen_readable
= 0;
488 ret
->localhost_only
= 0; /* unused, but best init anyway */
489 ret
->pending_error
= 0;
494 s
= socket(addr
->family
, SOCK_STREAM
, 0);
497 if (s
== INVALID_SOCKET
) {
498 err
= WSAGetLastError();
499 ret
->error
= winsock_error_string(err
);
503 ret
->oobinline
= oobinline
;
506 setsockopt(s
, SOL_SOCKET
, SO_OOBINLINE
, (void *) &b
, sizeof(b
));
511 setsockopt(s
, IPPROTO_TCP
, TCP_NODELAY
, (void *) &b
, sizeof(b
));
515 * Bind to local address.
518 localport
= 1023; /* count from 1023 downwards */
520 localport
= 0; /* just use port 0 (ie winsock picks) */
522 /* Loop round trying to bind */
527 if (addr
->family
== AF_INET6
) {
528 memset(&a6
, 0, sizeof(a6
));
529 a6
.sin6_family
= AF_INET6
;
530 /*a6.sin6_addr = in6addr_any; *//* == 0 */
531 a6
.sin6_port
= htons(localport
);
535 a
.sin_family
= AF_INET
;
536 a
.sin_addr
.s_addr
= htonl(INADDR_ANY
);
537 a
.sin_port
= htons(localport
);
540 retcode
= bind(s
, (addr
->family
== AF_INET6 ?
541 (struct sockaddr
*) &a6
:
542 (struct sockaddr
*) &a
),
544 AF_INET6 ?
sizeof(a6
) : sizeof(a
)));
546 retcode
= bind(s
, (struct sockaddr
*) &a
, sizeof(a
));
548 if (retcode
!= SOCKET_ERROR
) {
552 err
= WSAGetLastError();
553 if (err
!= WSAEADDRINUSE
) /* failed, for a bad reason */
558 break; /* we're only looping once */
561 break; /* we might have got to the end */
565 ret
->error
= winsock_error_string(err
);
570 * Connect to remote address.
573 if (addr
->family
== AF_INET6
) {
574 memset(&a
, 0, sizeof(a
));
575 a6
.sin6_family
= AF_INET6
;
576 a6
.sin6_port
= htons((short) port
);
578 ((struct sockaddr_in6
*) addr
->ai
->ai_addr
)->sin6_addr
;
582 a
.sin_family
= AF_INET
;
583 a
.sin_addr
.s_addr
= htonl(addr
->address
);
584 a
.sin_port
= htons((short) port
);
587 /* Set up a select mechanism. This could be an AsyncSelect on a
588 * window, or an EventSelect on an event object. */
589 errstr
= do_select(s
, 1);
597 connect(s
, ((addr
->family
== AF_INET6
) ?
598 (struct sockaddr
*) &a6
: (struct sockaddr
*) &a
),
599 (addr
->family
== AF_INET6
) ?
sizeof(a6
) : sizeof(a
))
601 connect(s
, (struct sockaddr
*) &a
, sizeof(a
))
604 err
= WSAGetLastError();
606 * We expect a potential EWOULDBLOCK here, because the
607 * chances are the front end has done a select for
608 * FD_CONNECT, so that connect() will complete
611 if ( err
!= WSAEWOULDBLOCK
) {
612 ret
->error
= winsock_error_string(err
);
617 * If we _don't_ get EWOULDBLOCK, the connect has completed
618 * and we should set the socket as writable.
628 Socket
sk_newlistener(int port
, Plug plug
, int local_host_only
)
630 static struct socket_function_table fn_table
= {
651 * Create Socket structure.
653 ret
= smalloc(sizeof(struct Socket_tag
));
657 bufchain_init(&ret
->output_data
);
658 ret
->writable
= 0; /* to start with */
659 ret
->sending_oob
= 0;
661 ret
->frozen_readable
= 0;
662 ret
->localhost_only
= local_host_only
;
663 ret
->pending_error
= 0;
668 s
= socket(AF_INET
, SOCK_STREAM
, 0);
671 if (s
== INVALID_SOCKET
) {
672 err
= WSAGetLastError();
673 ret
->error
= winsock_error_string(err
);
680 setsockopt(s
, SOL_SOCKET
, SO_REUSEADDR
, (const char *)&on
, sizeof(on
));
684 if (addr
->family
== AF_INET6
) {
685 memset(&a6
, 0, sizeof(a6
));
686 a6
.sin6_family
= AF_INET6
;
688 a6
.sin6_addr
= in6addr_loopback
;
690 a6
.sin6_addr
= in6addr_any
;
691 a6
.sin6_port
= htons(port
);
695 a
.sin_family
= AF_INET
;
697 a
.sin_addr
.s_addr
= htonl(INADDR_LOOPBACK
);
699 a
.sin_addr
.s_addr
= htonl(INADDR_ANY
);
700 a
.sin_port
= htons((short)port
);
703 retcode
= bind(s
, (addr
->family
== AF_INET6 ?
704 (struct sockaddr
*) &a6
:
705 (struct sockaddr
*) &a
),
707 AF_INET6 ?
sizeof(a6
) : sizeof(a
)));
709 retcode
= bind(s
, (struct sockaddr
*) &a
, sizeof(a
));
711 if (retcode
!= SOCKET_ERROR
) {
714 err
= WSAGetLastError();
718 ret
->error
= winsock_error_string(err
);
723 if (listen(s
, SOMAXCONN
) == SOCKET_ERROR
) {
725 ret
->error
= winsock_error_string(err
);
729 /* Set up a select mechanism. This could be an AsyncSelect on a
730 * window, or an EventSelect on an event object. */
731 errstr
= do_select(s
, 1);
742 static void sk_tcp_close(Socket sock
)
744 extern char *do_select(SOCKET skt
, int startup
);
745 Actual_Socket s
= (Actual_Socket
) sock
;
754 * The function which tries to send on a socket once it's deemed
757 void try_send(Actual_Socket s
)
759 while (s
->sending_oob
|| bufchain_size(&s
->output_data
) > 0) {
765 if (s
->sending_oob
) {
766 urgentflag
= MSG_OOB
;
767 len
= s
->sending_oob
;
771 bufchain_prefix(&s
->output_data
, &data
, &len
);
773 nsent
= send(s
->s
, data
, len
, urgentflag
);
774 noise_ultralight(nsent
);
776 err
= (nsent
< 0 ?
WSAGetLastError() : 0);
777 if ((err
< WSABASEERR
&& nsent
< 0) || err
== WSAEWOULDBLOCK
) {
779 * Perfectly normal: we've sent all we can for the moment.
781 * (Some WinSock send() implementations can return
782 * <0 but leave no sensible error indication -
783 * WSAGetLastError() is called but returns zero or
784 * a small number - so we check that case and treat
785 * it just like WSAEWOULDBLOCK.)
789 } else if (nsent
== 0 ||
790 err
== WSAECONNABORTED
|| err
== WSAECONNRESET
) {
792 * If send() returns CONNABORTED or CONNRESET, we
793 * unfortunately can't just call plug_closing(),
794 * because it's quite likely that we're currently
795 * _in_ a call from the code we'd be calling back
796 * to, so we'd have to make half the SSH code
797 * reentrant. Instead we flag a pending error on
798 * the socket, to be dealt with (by calling
799 * plug_closing()) at some suitable future moment.
801 s
->pending_error
= err
;
804 fatalbox(winsock_error_string(err
));
807 if (s
->sending_oob
) {
809 memmove(s
->oobdata
, s
->oobdata
+nsent
, len
-nsent
);
810 s
->sending_oob
= len
- nsent
;
815 bufchain_consume(&s
->output_data
, nsent
);
821 static int sk_tcp_write(Socket sock
, char *buf
, int len
)
823 Actual_Socket s
= (Actual_Socket
) sock
;
826 * Add the data to the buffer list on the socket.
828 bufchain_add(&s
->output_data
, buf
, len
);
831 * Now try sending from the start of the buffer list.
836 return bufchain_size(&s
->output_data
);
839 static int sk_tcp_write_oob(Socket sock
, char *buf
, int len
)
841 Actual_Socket s
= (Actual_Socket
) sock
;
844 * Replace the buffer list on the socket with the data.
846 bufchain_clear(&s
->output_data
);
847 assert(len
<= sizeof(s
->oobdata
));
848 memcpy(s
->oobdata
, buf
, len
);
849 s
->sending_oob
= len
;
852 * Now try sending from the start of the buffer list.
857 return s
->sending_oob
;
860 int select_result(WPARAM wParam
, LPARAM lParam
)
864 char buf
[20480]; /* nice big buffer for plenty of speed */
868 /* wParam is the socket itself */
869 s
= find234(sktree
, (void *) wParam
, cmpforsearch
);
871 return 1; /* boggle */
873 if ((err
= WSAGETSELECTERROR(lParam
)) != 0) {
875 * An error has occurred on this socket. Pass it to the
878 return plug_closing(s
->plug
, winsock_error_string(err
), err
, 0);
881 noise_ultralight(lParam
);
883 switch (WSAGETSELECTEVENT(lParam
)) {
885 s
->connected
= s
->writable
= 1;
888 /* In the case the socket is still frozen, we don't even bother */
890 s
->frozen_readable
= 1;
895 * We have received data on the socket. For an oobinline
896 * socket, this might be data _before_ an urgent pointer,
897 * in which case we send it to the back end with type==1
898 * (data prior to urgent).
902 ioctlsocket(s
->s
, SIOCATMARK
, &atmark
);
904 * Avoid checking the return value from ioctlsocket(),
905 * on the grounds that some WinSock wrappers don't
906 * support it. If it does nothing, we get atmark==1,
907 * which is equivalent to `no OOB pending', so the
908 * effect will be to non-OOB-ify any OOB data.
913 ret
= recv(s
->s
, buf
, sizeof(buf
), 0);
914 noise_ultralight(ret
);
916 err
= WSAGetLastError();
917 if (err
== WSAEWOULDBLOCK
) {
922 return plug_closing(s
->plug
, winsock_error_string(err
), err
,
924 } else if (0 == ret
) {
925 return plug_closing(s
->plug
, NULL
, 0, 0);
927 return plug_receive(s
->plug
, atmark ?
0 : 1, buf
, ret
);
932 * This will only happen on a non-oobinline socket. It
933 * indicates that we can immediately perform an OOB read
934 * and get back OOB data, which we will send to the back
935 * end with type==2 (urgent data).
937 ret
= recv(s
->s
, buf
, sizeof(buf
), MSG_OOB
);
938 noise_ultralight(ret
);
940 fatalbox(ret
== 0 ?
"Internal networking trouble" :
941 winsock_error_string(WSAGetLastError()));
943 return plug_receive(s
->plug
, 2, buf
, ret
);
948 int bufsize_before
, bufsize_after
;
950 bufsize_before
= s
->sending_oob
+ bufchain_size(&s
->output_data
);
952 bufsize_after
= s
->sending_oob
+ bufchain_size(&s
->output_data
);
953 if (bufsize_after
< bufsize_before
)
954 plug_sent(s
->plug
, bufsize_after
);
958 /* Signal a close on the socket. First read any outstanding data. */
961 ret
= recv(s
->s
, buf
, sizeof(buf
), 0);
963 err
= WSAGetLastError();
964 if (err
== WSAEWOULDBLOCK
)
966 return plug_closing(s
->plug
, winsock_error_string(err
),
970 open
&= plug_receive(s
->plug
, 0, buf
, ret
);
972 open
&= plug_closing(s
->plug
, NULL
, 0, 0);
978 struct sockaddr_in isa
;
979 int addrlen
= sizeof(struct sockaddr_in
);
980 SOCKET t
; /* socket of connection */
982 memset(&isa
, 0, sizeof(struct sockaddr_in
));
984 t
= accept(s
->s
,(struct sockaddr
*)&isa
,&addrlen
);
985 if (t
== INVALID_SOCKET
)
987 err
= WSAGetLastError();
988 if (err
== WSATRY_AGAIN
)
992 if (s
->localhost_only
&&
993 ntohl(isa
.sin_addr
.s_addr
) != INADDR_LOOPBACK
) {
994 closesocket(t
); /* dodgy WinSock let nonlocal through */
995 } else if (plug_accepting(s
->plug
, (void*)t
)) {
996 closesocket(t
); /* denied or error */
1005 * Deal with socket errors detected in try_send().
1007 void net_pending_errors(void)
1013 * This might be a fiddly business, because it's just possible
1014 * that handling a pending error on one socket might cause
1015 * others to be closed. (I can't think of any reason this might
1016 * happen in current SSH implementation, but to maintain
1017 * generality of this network layer I'll assume the worst.)
1019 * So what we'll do is search the socket list for _one_ socket
1020 * with a pending error, and then handle it, and then search
1021 * the list again _from the beginning_. Repeat until we make a
1022 * pass with no socket errors present. That way we are
1023 * protected against the socket list changing under our feet.
1027 for (i
= 0; (s
= index234(sktree
, i
)) != NULL
; i
++) {
1028 if (s
->pending_error
) {
1030 * An error has occurred on this socket. Pass it to the
1033 plug_closing(s
->plug
,
1034 winsock_error_string(s
->pending_error
),
1035 s
->pending_error
, 0);
1043 * Each socket abstraction contains a `void *' private field in
1044 * which the client can keep state.
1046 void sk_set_private_ptr(Socket sock
, void *ptr
)
1048 Actual_Socket s
= (Actual_Socket
) sock
;
1049 s
->private_ptr
= ptr
;
1052 void *sk_get_private_ptr(Socket sock
)
1054 Actual_Socket s
= (Actual_Socket
) sock
;
1055 return s
->private_ptr
;
1059 * Special error values are returned from sk_namelookup and sk_new
1060 * if there's a problem. These functions extract an error message,
1061 * or return NULL if there's no problem.
1063 char *sk_addr_error(SockAddr addr
)
1067 static char *sk_tcp_socket_error(Socket sock
)
1069 Actual_Socket s
= (Actual_Socket
) sock
;
1073 void sk_set_frozen(Socket sock
, int is_frozen
)
1075 Actual_Socket s
= (Actual_Socket
) sock
;
1076 if (s
->frozen
== is_frozen
)
1078 s
->frozen
= is_frozen
;
1079 if (!is_frozen
&& s
->frozen_readable
) {
1081 recv(s
->s
, &c
, 1, MSG_PEEK
);
1083 s
->frozen_readable
= 0;
1087 * For Plink: enumerate all sockets currently active.
1089 SOCKET
first_socket(int *state
)
1093 s
= index234(sktree
, (*state
)++);
1094 return s ? s
->s
: INVALID_SOCKET
;
1097 SOCKET
next_socket(int *state
)
1099 Actual_Socket s
= index234(sktree
, (*state
)++);
1100 return s ? s
->s
: INVALID_SOCKET
;