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 */
77 * We used to typedef struct Socket_tag *Socket.
79 * Since we have made the networking abstraction slightly more
80 * abstract, Socket no longer means a tcp socket (it could mean
81 * an ssl socket). So now we must use Actual_Socket when we know
82 * we are talking about a tcp socket.
84 typedef struct Socket_tag
*Actual_Socket
;
88 /* address family this belongs to, AF_INET for IPv4, AF_INET6 for IPv6. */
90 unsigned long address
; /* Address IPv4 style. */
92 struct addrinfo
*ai
; /* Address IPv6 style. */
96 static tree234
*sktree
;
98 static int cmpfortree(void *av
, void *bv
)
100 Actual_Socket a
= (Actual_Socket
) av
, b
= (Actual_Socket
) bv
;
101 unsigned long as
= (unsigned long) a
->s
, bs
= (unsigned long) b
->s
;
109 static int cmpforsearch(void *av
, void *bv
)
111 Actual_Socket b
= (Actual_Socket
) bv
;
112 unsigned long as
= (unsigned long) av
, bs
= (unsigned long) b
->s
;
122 sktree
= newtree234(cmpfortree
);
125 char *winsock_error_string(int error
)
129 return "Network error: Permission denied";
131 return "Network error: Address already in use";
132 case WSAEADDRNOTAVAIL
:
133 return "Network error: Cannot assign requested address";
134 case WSAEAFNOSUPPORT
:
136 "Network error: Address family not supported by protocol family";
138 return "Network error: Operation already in progress";
139 case WSAECONNABORTED
:
140 return "Network error: Software caused connection abort";
141 case WSAECONNREFUSED
:
142 return "Network error: Connection refused";
144 return "Network error: Connection reset by peer";
145 case WSAEDESTADDRREQ
:
146 return "Network error: Destination address required";
148 return "Network error: Bad address";
150 return "Network error: Host is down";
151 case WSAEHOSTUNREACH
:
152 return "Network error: No route to host";
154 return "Network error: Operation now in progress";
156 return "Network error: Interrupted function call";
158 return "Network error: Invalid argument";
160 return "Network error: Socket is already connected";
162 return "Network error: Too many open files";
164 return "Network error: Message too long";
166 return "Network error: Network is down";
168 return "Network error: Network dropped connection on reset";
170 return "Network error: Network is unreachable";
172 return "Network error: No buffer space available";
174 return "Network error: Bad protocol option";
176 return "Network error: Socket is not connected";
178 return "Network error: Socket operation on non-socket";
180 return "Network error: Operation not supported";
181 case WSAEPFNOSUPPORT
:
182 return "Network error: Protocol family not supported";
184 return "Network error: Too many processes";
185 case WSAEPROTONOSUPPORT
:
186 return "Network error: Protocol not supported";
188 return "Network error: Protocol wrong type for socket";
190 return "Network error: Cannot send after socket shutdown";
191 case WSAESOCKTNOSUPPORT
:
192 return "Network error: Socket type not supported";
194 return "Network error: Connection timed out";
196 return "Network error: Resource temporarily unavailable";
198 return "Network error: Graceful shutdown in progress";
200 return "Unknown network error";
204 SockAddr
sk_namelookup(char *host
, char **canonicalname
)
206 SockAddr ret
= smalloc(sizeof(struct SockAddr_tag
));
208 struct hostent
*h
= NULL
;
211 /* Clear the structure and default to IPv4. */
212 memset(ret
, 0, sizeof(struct SockAddr_tag
));
213 ret
->family
= 0; /* We set this one when we have resolved the host. */
216 if ((a
= inet_addr(host
)) == (unsigned long) INADDR_NONE
) {
219 /* Try to get the getaddrinfo() function from wship6.dll */
220 /* This way one doesn't need to have IPv6 dll's to use PuTTY and
221 * it will fallback to IPv4. */
222 typedef int (CALLBACK
* FGETADDRINFO
) (const char *nodename
,
223 const char *servname
,
224 const struct addrinfo
*
226 struct addrinfo
** res
);
227 FGETADDRINFO fGetAddrInfo
= NULL
;
229 HINSTANCE dllWSHIP6
= LoadLibrary("wship6.dll");
231 fGetAddrInfo
= (FGETADDRINFO
) GetProcAddress(dllWSHIP6
,
235 * Use fGetAddrInfo when it's available (which usually also
236 * means IPv6 is installed...)
239 /*debug(("Resolving \"%s\" with getaddrinfo() (IPv4+IPv6 capable)...\n", host)); */
240 if (fGetAddrInfo(host
, NULL
, NULL
, &ret
->ai
) == 0)
241 ret
->family
= ret
->ai
->ai_family
;
246 * Otherwise use the IPv4-only gethostbyname...
247 * (NOTE: we don't use gethostbyname as a
250 if (ret
->family
== 0) {
251 /*debug(("Resolving \"%s\" with gethostbyname() (IPv4 only)...\n", host)); */
252 if ( (h
= gethostbyname(host
)) )
253 ret
->family
= AF_INET
;
256 /*debug(("Done resolving...(family is %d) AF_INET = %d, AF_INET6 = %d\n", ret->family, AF_INET, AF_INET6)); */
258 if (ret
->family
== 0) {
259 DWORD err
= WSAGetLastError();
260 ret
->error
= (err
== WSAENETDOWN ?
"Network is down" :
262 WSAHOST_NOT_FOUND ?
"Host does not exist" : err
263 == WSATRY_AGAIN ?
"Host not found" :
265 fGetAddrInfo ?
"getaddrinfo: unknown error" :
267 "gethostbyname: unknown error");
271 FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER
|
272 FORMAT_MESSAGE_FROM_SYSTEM
|
273 FORMAT_MESSAGE_IGNORE_INSERTS
, NULL
, err
,
274 MAKELANGID(LANG_NEUTRAL
, SUBLANG_DEFAULT
),
275 (LPTSTR
) & lpMsgBuf
, 0, NULL
);
276 /*debug(("Error %ld: %s (h=%lx)\n", err, lpMsgBuf, h)); */
277 /* Free the buffer. */
285 /* If we got an address info use that... */
287 typedef int (CALLBACK
* FGETNAMEINFO
)
288 (const struct sockaddr FAR
* sa
, socklen_t salen
,
289 char FAR
* host
, size_t hostlen
, char FAR
* serv
,
290 size_t servlen
, int flags
);
291 FGETNAMEINFO fGetNameInfo
= NULL
;
293 /* Are we in IPv4 fallback mode? */
294 /* We put the IPv4 address into the a variable so we can further-on use the IPv4 code... */
295 if (ret
->family
== AF_INET
)
297 (char *) &((SOCKADDR_IN
*) ret
->ai
->
298 ai_addr
)->sin_addr
, sizeof(a
));
300 /* Now let's find that canonicalname... */
303 (FGETNAMEINFO
) GetProcAddress(dllWSHIP6
,
306 ((struct sockaddr
*) ret
->ai
->ai_addr
,
308 AF_INET ?
sizeof(SOCKADDR_IN
) :
309 sizeof(SOCKADDR_IN6
), realhost
,
310 sizeof(realhost
), NULL
, 0, 0) != 0) {
311 strncpy(realhost
, host
, sizeof(realhost
));
315 /* We used the IPv4-only gethostbyname()... */
319 memcpy(&a
, h
->h_addr
, sizeof(a
));
320 /* This way we are always sure the h->h_name is valid :) */
321 strncpy(realhost
, h
->h_name
, sizeof(realhost
));
325 FreeLibrary(dllWSHIP6
);
329 * This must be a numeric IPv4 address because it caused a
330 * success return from inet_addr.
332 ret
->family
= AF_INET
;
333 strncpy(realhost
, host
, sizeof(realhost
));
335 ret
->address
= ntohl(a
);
336 realhost
[lenof(realhost
)-1] = '\0';
337 *canonicalname
= smalloc(1+strlen(realhost
));
338 strcpy(*canonicalname
, realhost
);
342 void sk_getaddr(SockAddr addr
, char *buf
, int buflen
)
345 if (addr
->family
== AF_INET
) {
348 a
.s_addr
= htonl(addr
->address
);
349 strncpy(buf
, inet_ntoa(a
), buflen
);
352 FIXME
; /* I don't know how to get a text form of an IPv6 address. */
357 void sk_addr_free(SockAddr addr
)
362 static Plug
sk_tcp_plug(Socket sock
, Plug p
)
364 Actual_Socket s
= (Actual_Socket
) sock
;
371 static void sk_tcp_flush(Socket s
)
374 * We send data to the socket as soon as we can anyway,
375 * so we don't need to do anything here. :-)
379 static void sk_tcp_close(Socket s
);
380 static int sk_tcp_write(Socket s
, char *data
, int len
);
381 static int sk_tcp_write_oob(Socket s
, char *data
, int len
);
382 static char *sk_tcp_socket_error(Socket s
);
384 extern char *do_select(SOCKET skt
, int startup
);
386 Socket
sk_register(void *sock
, Plug plug
)
388 static struct socket_function_table fn_table
= {
402 * Create Socket structure.
404 ret
= smalloc(sizeof(struct Socket_tag
));
408 bufchain_init(&ret
->output_data
);
409 ret
->writable
= 1; /* to start with */
410 ret
->sending_oob
= 0;
412 ret
->frozen_readable
= 0;
414 ret
->s
= (SOCKET
)sock
;
416 if (ret
->s
== INVALID_SOCKET
) {
417 err
= WSAGetLastError();
418 ret
->error
= winsock_error_string(err
);
424 /* Set up a select mechanism. This could be an AsyncSelect on a
425 * window, or an EventSelect on an event object. */
426 errstr
= do_select(ret
->s
, 1);
437 Socket
sk_new(SockAddr addr
, int port
, int privport
, int oobinline
,
440 static struct socket_function_table fn_table
= {
460 * Create Socket structure.
462 ret
= smalloc(sizeof(struct Socket_tag
));
466 bufchain_init(&ret
->output_data
);
467 ret
->connected
= 0; /* to start with */
468 ret
->writable
= 0; /* to start with */
469 ret
->sending_oob
= 0;
471 ret
->frozen_readable
= 0;
476 s
= socket(addr
->family
, SOCK_STREAM
, 0);
479 if (s
== INVALID_SOCKET
) {
480 err
= WSAGetLastError();
481 ret
->error
= winsock_error_string(err
);
485 ret
->oobinline
= oobinline
;
488 setsockopt(s
, SOL_SOCKET
, SO_OOBINLINE
, (void *) &b
, sizeof(b
));
492 * Bind to local address.
495 localport
= 1023; /* count from 1023 downwards */
497 localport
= 0; /* just use port 0 (ie winsock picks) */
499 /* Loop round trying to bind */
504 if (addr
->family
== AF_INET6
) {
505 memset(&a6
, 0, sizeof(a6
));
506 a6
.sin6_family
= AF_INET6
;
507 /*a6.sin6_addr = in6addr_any; *//* == 0 */
508 a6
.sin6_port
= htons(localport
);
512 a
.sin_family
= AF_INET
;
513 a
.sin_addr
.s_addr
= htonl(INADDR_ANY
);
514 a
.sin_port
= htons(localport
);
517 retcode
= bind(s
, (addr
->family
== AF_INET6 ?
518 (struct sockaddr
*) &a6
:
519 (struct sockaddr
*) &a
),
521 AF_INET6 ?
sizeof(a6
) : sizeof(a
)));
523 retcode
= bind(s
, (struct sockaddr
*) &a
, sizeof(a
));
525 if (retcode
!= SOCKET_ERROR
) {
529 err
= WSAGetLastError();
530 if (err
!= WSAEADDRINUSE
) /* failed, for a bad reason */
535 break; /* we're only looping once */
538 break; /* we might have got to the end */
542 ret
->error
= winsock_error_string(err
);
547 * Connect to remote address.
550 if (addr
->family
== AF_INET6
) {
551 memset(&a
, 0, sizeof(a
));
552 a6
.sin6_family
= AF_INET6
;
553 a6
.sin6_port
= htons((short) port
);
555 ((struct sockaddr_in6
*) addr
->ai
->ai_addr
)->sin6_addr
;
559 a
.sin_family
= AF_INET
;
560 a
.sin_addr
.s_addr
= htonl(addr
->address
);
561 a
.sin_port
= htons((short) port
);
564 /* Set up a select mechanism. This could be an AsyncSelect on a
565 * window, or an EventSelect on an event object. */
566 errstr
= do_select(s
, 1);
574 connect(s
, ((addr
->family
== AF_INET6
) ?
575 (struct sockaddr
*) &a6
: (struct sockaddr
*) &a
),
576 (addr
->family
== AF_INET6
) ?
sizeof(a6
) : sizeof(a
))
578 connect(s
, (struct sockaddr
*) &a
, sizeof(a
))
581 err
= WSAGetLastError();
583 * We expect a potential EWOULDBLOCK here, because the
584 * chances are the front end has done a select for
585 * FD_CONNECT, so that connect() will complete
588 if ( err
!= WSAEWOULDBLOCK
) {
589 ret
->error
= winsock_error_string(err
);
594 * If we _don't_ get EWOULDBLOCK, the connect has completed
595 * and we should set the socket as writable.
605 Socket
sk_newlistener(int port
, Plug plug
, int local_host_only
)
607 static struct socket_function_table fn_table
= {
628 * Create Socket structure.
630 ret
= smalloc(sizeof(struct Socket_tag
));
634 bufchain_init(&ret
->output_data
);
635 ret
->writable
= 0; /* to start with */
636 ret
->sending_oob
= 0;
638 ret
->frozen_readable
= 0;
643 s
= socket(AF_INET
, SOCK_STREAM
, 0);
646 if (s
== INVALID_SOCKET
) {
647 err
= WSAGetLastError();
648 ret
->error
= winsock_error_string(err
);
655 setsockopt(s
, SOL_SOCKET
, SO_REUSEADDR
, (const char *)&on
, sizeof(on
));
659 if (addr
->family
== AF_INET6
) {
660 memset(&a6
, 0, sizeof(a6
));
661 a6
.sin6_family
= AF_INET6
;
663 a6
.sin6_addr
= in6addr_loopback
;
665 a6
.sin6_addr
= in6addr_any
;
666 a6
.sin6_port
= htons(port
);
670 a
.sin_family
= AF_INET
;
672 a
.sin_addr
.s_addr
= htonl(INADDR_LOOPBACK
);
674 a
.sin_addr
.s_addr
= htonl(INADDR_ANY
);
675 a
.sin_port
= htons((short)port
);
678 retcode
= bind(s
, (addr
->family
== AF_INET6 ?
679 (struct sockaddr
*) &a6
:
680 (struct sockaddr
*) &a
),
682 AF_INET6 ?
sizeof(a6
) : sizeof(a
)));
684 retcode
= bind(s
, (struct sockaddr
*) &a
, sizeof(a
));
686 if (retcode
!= SOCKET_ERROR
) {
689 err
= WSAGetLastError();
693 ret
->error
= winsock_error_string(err
);
698 if (listen(s
, SOMAXCONN
) == SOCKET_ERROR
) {
700 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(s
, 1);
717 static void sk_tcp_close(Socket sock
)
719 extern char *do_select(SOCKET skt
, int startup
);
720 Actual_Socket s
= (Actual_Socket
) sock
;
729 * The function which tries to send on a socket once it's deemed
732 void try_send(Actual_Socket s
)
734 while (s
->sending_oob
|| bufchain_size(&s
->output_data
) > 0) {
740 if (s
->sending_oob
) {
741 urgentflag
= MSG_OOB
;
742 len
= s
->sending_oob
;
746 bufchain_prefix(&s
->output_data
, &data
, &len
);
749 nsent
= send(s
->s
, data
, len
, urgentflag
);
750 noise_ultralight(nsent
);
752 err
= (nsent
< 0 ?
WSAGetLastError() : 0);
753 if ((err
< WSABASEERR
&& nsent
< 0) || err
== WSAEWOULDBLOCK
) {
755 * Perfectly normal: we've sent all we can for the moment.
757 * (Some WinSock send() implementations can return
758 * <0 but leave no sensible error indication -
759 * WSAGetLastError() is called but returns zero or
760 * a small number - so we check that case and treat
761 * it just like WSAEWOULDBLOCK.)
765 } else if (nsent
== 0 ||
766 err
== WSAECONNABORTED
|| err
== WSAECONNRESET
) {
768 * FIXME. This will have to be done better when we
769 * start managing multiple sockets (e.g. SSH port
770 * forwarding), because if we get CONNRESET while
771 * trying to write a particular forwarded socket
772 * then it isn't necessarily the end of the world.
773 * Ideally I'd like to pass the error code back to
774 * somewhere the next select_result() will see it,
775 * but that might be hard. Perhaps I should pass it
776 * back to be queued in the Windows front end bit.
778 fatalbox(winsock_error_string(err
));
780 fatalbox(winsock_error_string(err
));
783 if (s
->sending_oob
) {
785 memmove(s
->oobdata
, s
->oobdata
+nsent
, len
-nsent
);
786 s
->sending_oob
= len
- nsent
;
791 bufchain_consume(&s
->output_data
, nsent
);
797 static int sk_tcp_write(Socket sock
, char *buf
, int len
)
799 Actual_Socket s
= (Actual_Socket
) sock
;
802 * Add the data to the buffer list on the socket.
804 bufchain_add(&s
->output_data
, buf
, len
);
807 * Now try sending from the start of the buffer list.
812 return bufchain_size(&s
->output_data
);
815 static int sk_tcp_write_oob(Socket sock
, char *buf
, int len
)
817 Actual_Socket s
= (Actual_Socket
) sock
;
820 * Replace the buffer list on the socket with the data.
822 bufchain_clear(&s
->output_data
);
823 assert(len
<= sizeof(s
->oobdata
));
824 memcpy(s
->oobdata
, buf
, len
);
825 s
->sending_oob
= len
;
828 * Now try sending from the start of the buffer list.
833 return s
->sending_oob
;
836 int select_result(WPARAM wParam
, LPARAM lParam
)
840 char buf
[20480]; /* nice big buffer for plenty of speed */
844 /* wParam is the socket itself */
845 s
= find234(sktree
, (void *) wParam
, cmpforsearch
);
847 return 1; /* boggle */
849 if ((err
= WSAGETSELECTERROR(lParam
)) != 0) {
851 * An error has occurred on this socket. Pass it to the
854 return plug_closing(s
->plug
, winsock_error_string(err
), err
, 0);
857 noise_ultralight(lParam
);
859 switch (WSAGETSELECTEVENT(lParam
)) {
861 s
->connected
= s
->writable
= 1;
864 /* In the case the socket is still frozen, we don't even bother */
866 s
->frozen_readable
= 1;
871 * We have received data on the socket. For an oobinline
872 * socket, this might be data _before_ an urgent pointer,
873 * in which case we send it to the back end with type==1
874 * (data prior to urgent).
878 ioctlsocket(s
->s
, SIOCATMARK
, &atmark
);
880 * Avoid checking the return value from ioctlsocket(),
881 * on the grounds that some WinSock wrappers don't
882 * support it. If it does nothing, we get atmark==1,
883 * which is equivalent to `no OOB pending', so the
884 * effect will be to non-OOB-ify any OOB data.
889 ret
= recv(s
->s
, buf
, sizeof(buf
), 0);
890 noise_ultralight(ret
);
892 err
= WSAGetLastError();
893 if (err
== WSAEWOULDBLOCK
) {
898 return plug_closing(s
->plug
, winsock_error_string(err
), err
,
900 } else if (0 == ret
) {
901 return plug_closing(s
->plug
, NULL
, 0, 0);
903 return plug_receive(s
->plug
, atmark ?
0 : 1, buf
, ret
);
908 * This will only happen on a non-oobinline socket. It
909 * indicates that we can immediately perform an OOB read
910 * and get back OOB data, which we will send to the back
911 * end with type==2 (urgent data).
913 ret
= recv(s
->s
, buf
, sizeof(buf
), MSG_OOB
);
914 noise_ultralight(ret
);
916 fatalbox(ret
== 0 ?
"Internal networking trouble" :
917 winsock_error_string(WSAGetLastError()));
919 return plug_receive(s
->plug
, 2, buf
, ret
);
924 int bufsize_before
, bufsize_after
;
926 bufsize_before
= s
->sending_oob
+ bufchain_size(&s
->output_data
);
928 bufsize_after
= s
->sending_oob
+ bufchain_size(&s
->output_data
);
929 if (bufsize_after
< bufsize_before
)
930 plug_sent(s
->plug
, bufsize_after
);
934 /* Signal a close on the socket. First read any outstanding data. */
937 ret
= recv(s
->s
, buf
, sizeof(buf
), 0);
939 err
= WSAGetLastError();
940 if (err
== WSAEWOULDBLOCK
)
942 return plug_closing(s
->plug
, winsock_error_string(err
),
946 open
&= plug_receive(s
->plug
, 0, buf
, ret
);
948 open
&= plug_closing(s
->plug
, NULL
, 0, 0);
955 int addrlen
= sizeof(struct sockaddr
);
956 SOCKET t
; /* socket of connection */
958 memset(&isa
, 0, sizeof(struct sockaddr
));
960 t
= accept(s
->s
,&isa
,&addrlen
);
961 if (t
== INVALID_SOCKET
)
963 err
= WSAGetLastError();
964 if (err
== WSATRY_AGAIN
)
968 if (plug_accepting(s
->plug
, (void*)t
)) {
969 closesocket(t
); /* denied or error */
978 * Each socket abstraction contains a `void *' private field in
979 * which the client can keep state.
981 void sk_set_private_ptr(Socket sock
, void *ptr
)
983 Actual_Socket s
= (Actual_Socket
) sock
;
984 s
->private_ptr
= ptr
;
987 void *sk_get_private_ptr(Socket sock
)
989 Actual_Socket s
= (Actual_Socket
) sock
;
990 return s
->private_ptr
;
994 * Special error values are returned from sk_namelookup and sk_new
995 * if there's a problem. These functions extract an error message,
996 * or return NULL if there's no problem.
998 char *sk_addr_error(SockAddr addr
)
1002 static char *sk_tcp_socket_error(Socket sock
)
1004 Actual_Socket s
= (Actual_Socket
) sock
;
1008 void sk_set_frozen(Socket sock
, int is_frozen
)
1010 Actual_Socket s
= (Actual_Socket
) sock
;
1011 if (s
->frozen
== is_frozen
)
1013 s
->frozen
= is_frozen
;
1014 if (!is_frozen
&& s
->frozen_readable
) {
1016 recv(s
->s
, &c
, 1, MSG_PEEK
);
1018 s
->frozen_readable
= 0;
1022 * For Plink: enumerate all sockets currently active.
1024 SOCKET
first_socket(int *state
)
1028 s
= index234(sktree
, (*state
)++);
1029 return s ? s
->s
: INVALID_SOCKET
;
1032 SOCKET
next_socket(int *state
)
1034 Actual_Socket s
= index234(sktree
, (*state
)++);
1035 return s ? s
->s
: INVALID_SOCKET
;