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 */
78 * We used to typedef struct Socket_tag *Socket.
80 * Since we have made the networking abstraction slightly more
81 * abstract, Socket no longer means a tcp socket (it could mean
82 * an ssl socket). So now we must use Actual_Socket when we know
83 * we are talking about a tcp socket.
85 typedef struct Socket_tag
*Actual_Socket
;
89 /* address family this belongs to, AF_INET for IPv4, AF_INET6 for IPv6. */
91 unsigned long address
; /* Address IPv4 style. */
93 struct addrinfo
*ai
; /* Address IPv6 style. */
97 static tree234
*sktree
;
99 static int cmpfortree(void *av
, void *bv
)
101 Actual_Socket a
= (Actual_Socket
) av
, b
= (Actual_Socket
) bv
;
102 unsigned long as
= (unsigned long) a
->s
, bs
= (unsigned long) b
->s
;
110 static int cmpforsearch(void *av
, void *bv
)
112 Actual_Socket b
= (Actual_Socket
) bv
;
113 unsigned long as
= (unsigned long) av
, bs
= (unsigned long) b
->s
;
123 sktree
= newtree234(cmpfortree
);
126 char *winsock_error_string(int error
)
130 return "Network error: Permission denied";
132 return "Network error: Address already in use";
133 case WSAEADDRNOTAVAIL
:
134 return "Network error: Cannot assign requested address";
135 case WSAEAFNOSUPPORT
:
137 "Network error: Address family not supported by protocol family";
139 return "Network error: Operation already in progress";
140 case WSAECONNABORTED
:
141 return "Network error: Software caused connection abort";
142 case WSAECONNREFUSED
:
143 return "Network error: Connection refused";
145 return "Network error: Connection reset by peer";
146 case WSAEDESTADDRREQ
:
147 return "Network error: Destination address required";
149 return "Network error: Bad address";
151 return "Network error: Host is down";
152 case WSAEHOSTUNREACH
:
153 return "Network error: No route to host";
155 return "Network error: Operation now in progress";
157 return "Network error: Interrupted function call";
159 return "Network error: Invalid argument";
161 return "Network error: Socket is already connected";
163 return "Network error: Too many open files";
165 return "Network error: Message too long";
167 return "Network error: Network is down";
169 return "Network error: Network dropped connection on reset";
171 return "Network error: Network is unreachable";
173 return "Network error: No buffer space available";
175 return "Network error: Bad protocol option";
177 return "Network error: Socket is not connected";
179 return "Network error: Socket operation on non-socket";
181 return "Network error: Operation not supported";
182 case WSAEPFNOSUPPORT
:
183 return "Network error: Protocol family not supported";
185 return "Network error: Too many processes";
186 case WSAEPROTONOSUPPORT
:
187 return "Network error: Protocol not supported";
189 return "Network error: Protocol wrong type for socket";
191 return "Network error: Cannot send after socket shutdown";
192 case WSAESOCKTNOSUPPORT
:
193 return "Network error: Socket type not supported";
195 return "Network error: Connection timed out";
197 return "Network error: Resource temporarily unavailable";
199 return "Network error: Graceful shutdown in progress";
201 return "Unknown network error";
205 SockAddr
sk_namelookup(char *host
, char **canonicalname
)
207 SockAddr ret
= smalloc(sizeof(struct SockAddr_tag
));
209 struct hostent
*h
= NULL
;
212 /* Clear the structure and default to IPv4. */
213 memset(ret
, 0, sizeof(struct SockAddr_tag
));
214 ret
->family
= 0; /* We set this one when we have resolved the host. */
217 if ((a
= inet_addr(host
)) == (unsigned long) INADDR_NONE
) {
220 /* Try to get the getaddrinfo() function from wship6.dll */
221 /* This way one doesn't need to have IPv6 dll's to use PuTTY and
222 * it will fallback to IPv4. */
223 typedef int (CALLBACK
* FGETADDRINFO
) (const char *nodename
,
224 const char *servname
,
225 const struct addrinfo
*
227 struct addrinfo
** res
);
228 FGETADDRINFO fGetAddrInfo
= NULL
;
230 HINSTANCE dllWSHIP6
= LoadLibrary("wship6.dll");
232 fGetAddrInfo
= (FGETADDRINFO
) GetProcAddress(dllWSHIP6
,
236 * Use fGetAddrInfo when it's available (which usually also
237 * means IPv6 is installed...)
240 /*debug(("Resolving \"%s\" with getaddrinfo() (IPv4+IPv6 capable)...\n", host)); */
241 if (fGetAddrInfo(host
, NULL
, NULL
, &ret
->ai
) == 0)
242 ret
->family
= ret
->ai
->ai_family
;
247 * Otherwise use the IPv4-only gethostbyname...
248 * (NOTE: we don't use gethostbyname as a
251 if (ret
->family
== 0) {
252 /*debug(("Resolving \"%s\" with gethostbyname() (IPv4 only)...\n", host)); */
253 if ( (h
= gethostbyname(host
)) )
254 ret
->family
= AF_INET
;
257 /*debug(("Done resolving...(family is %d) AF_INET = %d, AF_INET6 = %d\n", ret->family, AF_INET, AF_INET6)); */
259 if (ret
->family
== 0) {
260 DWORD err
= WSAGetLastError();
261 ret
->error
= (err
== WSAENETDOWN ?
"Network is down" :
263 WSAHOST_NOT_FOUND ?
"Host does not exist" : err
264 == WSATRY_AGAIN ?
"Host not found" :
266 fGetAddrInfo ?
"getaddrinfo: unknown error" :
268 "gethostbyname: unknown error");
272 FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER
|
273 FORMAT_MESSAGE_FROM_SYSTEM
|
274 FORMAT_MESSAGE_IGNORE_INSERTS
, NULL
, err
,
275 MAKELANGID(LANG_NEUTRAL
, SUBLANG_DEFAULT
),
276 (LPTSTR
) & lpMsgBuf
, 0, NULL
);
277 /*debug(("Error %ld: %s (h=%lx)\n", err, lpMsgBuf, h)); */
278 /* Free the buffer. */
286 /* If we got an address info use that... */
288 typedef int (CALLBACK
* FGETNAMEINFO
)
289 (const struct sockaddr FAR
* sa
, socklen_t salen
,
290 char FAR
* host
, size_t hostlen
, char FAR
* serv
,
291 size_t servlen
, int flags
);
292 FGETNAMEINFO fGetNameInfo
= NULL
;
294 /* Are we in IPv4 fallback mode? */
295 /* We put the IPv4 address into the a variable so we can further-on use the IPv4 code... */
296 if (ret
->family
== AF_INET
)
298 (char *) &((SOCKADDR_IN
*) ret
->ai
->
299 ai_addr
)->sin_addr
, sizeof(a
));
301 /* Now let's find that canonicalname... */
304 (FGETNAMEINFO
) GetProcAddress(dllWSHIP6
,
307 ((struct sockaddr
*) ret
->ai
->ai_addr
,
309 AF_INET ?
sizeof(SOCKADDR_IN
) :
310 sizeof(SOCKADDR_IN6
), realhost
,
311 sizeof(realhost
), NULL
, 0, 0) != 0) {
312 strncpy(realhost
, host
, sizeof(realhost
));
316 /* We used the IPv4-only gethostbyname()... */
320 memcpy(&a
, h
->h_addr
, sizeof(a
));
321 /* This way we are always sure the h->h_name is valid :) */
322 strncpy(realhost
, h
->h_name
, sizeof(realhost
));
326 FreeLibrary(dllWSHIP6
);
330 * This must be a numeric IPv4 address because it caused a
331 * success return from inet_addr.
333 ret
->family
= AF_INET
;
334 strncpy(realhost
, host
, sizeof(realhost
));
336 ret
->address
= ntohl(a
);
337 realhost
[lenof(realhost
)-1] = '\0';
338 *canonicalname
= smalloc(1+strlen(realhost
));
339 strcpy(*canonicalname
, realhost
);
343 void sk_getaddr(SockAddr addr
, char *buf
, int buflen
)
346 if (addr
->family
== AF_INET
) {
349 a
.s_addr
= htonl(addr
->address
);
350 strncpy(buf
, inet_ntoa(a
), buflen
);
353 FIXME
; /* I don't know how to get a text form of an IPv6 address. */
358 void sk_addr_free(SockAddr addr
)
363 static Plug
sk_tcp_plug(Socket sock
, Plug p
)
365 Actual_Socket s
= (Actual_Socket
) sock
;
372 static void sk_tcp_flush(Socket s
)
375 * We send data to the socket as soon as we can anyway,
376 * so we don't need to do anything here. :-)
380 static void sk_tcp_close(Socket s
);
381 static int sk_tcp_write(Socket s
, char *data
, int len
);
382 static int sk_tcp_write_oob(Socket s
, char *data
, int len
);
383 static char *sk_tcp_socket_error(Socket s
);
385 extern char *do_select(SOCKET skt
, int startup
);
387 Socket
sk_register(void *sock
, Plug plug
)
389 static struct socket_function_table fn_table
= {
403 * Create Socket structure.
405 ret
= smalloc(sizeof(struct Socket_tag
));
409 bufchain_init(&ret
->output_data
);
410 ret
->writable
= 1; /* to start with */
411 ret
->sending_oob
= 0;
413 ret
->frozen_readable
= 0;
414 ret
->localhost_only
= 0; /* unused, but best init anyway */
416 ret
->s
= (SOCKET
)sock
;
418 if (ret
->s
== INVALID_SOCKET
) {
419 err
= WSAGetLastError();
420 ret
->error
= winsock_error_string(err
);
426 /* Set up a select mechanism. This could be an AsyncSelect on a
427 * window, or an EventSelect on an event object. */
428 errstr
= do_select(ret
->s
, 1);
439 Socket
sk_new(SockAddr addr
, int port
, int privport
, int oobinline
,
442 static struct socket_function_table fn_table
= {
462 * Create Socket structure.
464 ret
= smalloc(sizeof(struct Socket_tag
));
468 bufchain_init(&ret
->output_data
);
469 ret
->connected
= 0; /* to start with */
470 ret
->writable
= 0; /* to start with */
471 ret
->sending_oob
= 0;
473 ret
->frozen_readable
= 0;
474 ret
->localhost_only
= 0; /* unused, but best init anyway */
479 s
= socket(addr
->family
, SOCK_STREAM
, 0);
482 if (s
== INVALID_SOCKET
) {
483 err
= WSAGetLastError();
484 ret
->error
= winsock_error_string(err
);
488 ret
->oobinline
= oobinline
;
491 setsockopt(s
, SOL_SOCKET
, SO_OOBINLINE
, (void *) &b
, sizeof(b
));
495 * Bind to local address.
498 localport
= 1023; /* count from 1023 downwards */
500 localport
= 0; /* just use port 0 (ie winsock picks) */
502 /* Loop round trying to bind */
507 if (addr
->family
== AF_INET6
) {
508 memset(&a6
, 0, sizeof(a6
));
509 a6
.sin6_family
= AF_INET6
;
510 /*a6.sin6_addr = in6addr_any; *//* == 0 */
511 a6
.sin6_port
= htons(localport
);
515 a
.sin_family
= AF_INET
;
516 a
.sin_addr
.s_addr
= htonl(INADDR_ANY
);
517 a
.sin_port
= htons(localport
);
520 retcode
= bind(s
, (addr
->family
== AF_INET6 ?
521 (struct sockaddr
*) &a6
:
522 (struct sockaddr
*) &a
),
524 AF_INET6 ?
sizeof(a6
) : sizeof(a
)));
526 retcode
= bind(s
, (struct sockaddr
*) &a
, sizeof(a
));
528 if (retcode
!= SOCKET_ERROR
) {
532 err
= WSAGetLastError();
533 if (err
!= WSAEADDRINUSE
) /* failed, for a bad reason */
538 break; /* we're only looping once */
541 break; /* we might have got to the end */
545 ret
->error
= winsock_error_string(err
);
550 * Connect to remote address.
553 if (addr
->family
== AF_INET6
) {
554 memset(&a
, 0, sizeof(a
));
555 a6
.sin6_family
= AF_INET6
;
556 a6
.sin6_port
= htons((short) port
);
558 ((struct sockaddr_in6
*) addr
->ai
->ai_addr
)->sin6_addr
;
562 a
.sin_family
= AF_INET
;
563 a
.sin_addr
.s_addr
= htonl(addr
->address
);
564 a
.sin_port
= htons((short) port
);
567 /* Set up a select mechanism. This could be an AsyncSelect on a
568 * window, or an EventSelect on an event object. */
569 errstr
= do_select(s
, 1);
577 connect(s
, ((addr
->family
== AF_INET6
) ?
578 (struct sockaddr
*) &a6
: (struct sockaddr
*) &a
),
579 (addr
->family
== AF_INET6
) ?
sizeof(a6
) : sizeof(a
))
581 connect(s
, (struct sockaddr
*) &a
, sizeof(a
))
584 err
= WSAGetLastError();
586 * We expect a potential EWOULDBLOCK here, because the
587 * chances are the front end has done a select for
588 * FD_CONNECT, so that connect() will complete
591 if ( err
!= WSAEWOULDBLOCK
) {
592 ret
->error
= winsock_error_string(err
);
597 * If we _don't_ get EWOULDBLOCK, the connect has completed
598 * and we should set the socket as writable.
608 Socket
sk_newlistener(int port
, Plug plug
, int local_host_only
)
610 static struct socket_function_table fn_table
= {
631 * Create Socket structure.
633 ret
= smalloc(sizeof(struct Socket_tag
));
637 bufchain_init(&ret
->output_data
);
638 ret
->writable
= 0; /* to start with */
639 ret
->sending_oob
= 0;
641 ret
->frozen_readable
= 0;
642 ret
->localhost_only
= local_host_only
;
647 s
= socket(AF_INET
, SOCK_STREAM
, 0);
650 if (s
== INVALID_SOCKET
) {
651 err
= WSAGetLastError();
652 ret
->error
= winsock_error_string(err
);
659 setsockopt(s
, SOL_SOCKET
, SO_REUSEADDR
, (const char *)&on
, sizeof(on
));
663 if (addr
->family
== AF_INET6
) {
664 memset(&a6
, 0, sizeof(a6
));
665 a6
.sin6_family
= AF_INET6
;
667 a6
.sin6_addr
= in6addr_loopback
;
669 a6
.sin6_addr
= in6addr_any
;
670 a6
.sin6_port
= htons(port
);
674 a
.sin_family
= AF_INET
;
676 a
.sin_addr
.s_addr
= htonl(INADDR_LOOPBACK
);
678 a
.sin_addr
.s_addr
= htonl(INADDR_ANY
);
679 a
.sin_port
= htons((short)port
);
682 retcode
= bind(s
, (addr
->family
== AF_INET6 ?
683 (struct sockaddr
*) &a6
:
684 (struct sockaddr
*) &a
),
686 AF_INET6 ?
sizeof(a6
) : sizeof(a
)));
688 retcode
= bind(s
, (struct sockaddr
*) &a
, sizeof(a
));
690 if (retcode
!= SOCKET_ERROR
) {
693 err
= WSAGetLastError();
697 ret
->error
= winsock_error_string(err
);
702 if (listen(s
, SOMAXCONN
) == SOCKET_ERROR
) {
704 ret
->error
= winsock_error_string(err
);
708 /* Set up a select mechanism. This could be an AsyncSelect on a
709 * window, or an EventSelect on an event object. */
710 errstr
= do_select(s
, 1);
721 static void sk_tcp_close(Socket sock
)
723 extern char *do_select(SOCKET skt
, int startup
);
724 Actual_Socket s
= (Actual_Socket
) sock
;
733 * The function which tries to send on a socket once it's deemed
736 void try_send(Actual_Socket s
)
738 while (s
->sending_oob
|| bufchain_size(&s
->output_data
) > 0) {
744 if (s
->sending_oob
) {
745 urgentflag
= MSG_OOB
;
746 len
= s
->sending_oob
;
750 bufchain_prefix(&s
->output_data
, &data
, &len
);
752 nsent
= send(s
->s
, data
, len
, urgentflag
);
753 noise_ultralight(nsent
);
755 err
= (nsent
< 0 ?
WSAGetLastError() : 0);
756 if ((err
< WSABASEERR
&& nsent
< 0) || err
== WSAEWOULDBLOCK
) {
758 * Perfectly normal: we've sent all we can for the moment.
760 * (Some WinSock send() implementations can return
761 * <0 but leave no sensible error indication -
762 * WSAGetLastError() is called but returns zero or
763 * a small number - so we check that case and treat
764 * it just like WSAEWOULDBLOCK.)
768 } else if (nsent
== 0 ||
769 err
== WSAECONNABORTED
|| err
== WSAECONNRESET
) {
773 * I'm assuming here that if a TCP connection is
774 * reset or aborted once established, we will be
775 * notified by a select event rather than a
776 * CONNABORTED or CONNRESET from send(). In other
777 * words, I'm assuming CONNABORTED and CONNRESET
778 * don't come back from a _nonblocking_ send(),
779 * because the local side doesn't know they've
780 * happened until it waits for a response to its
781 * TCP segment - so the error will arrive
784 * If I'm wrong, this will be a really nasty case,
785 * because we can't necessarily call plug_closing()
786 * without having to make half the SSH code
787 * reentrant; so instead we'll have to schedule a
788 * call to plug_closing() for some suitable future
791 fatalbox("SERIOUS NETWORK INTERNAL ERROR: %s\n"
792 "Please report this immediately to "
793 "<putty@projects.tartarus.org>.",
794 winsock_error_string(err
));
796 fatalbox(winsock_error_string(err
));
799 if (s
->sending_oob
) {
801 memmove(s
->oobdata
, s
->oobdata
+nsent
, len
-nsent
);
802 s
->sending_oob
= len
- nsent
;
807 bufchain_consume(&s
->output_data
, nsent
);
813 static int sk_tcp_write(Socket sock
, char *buf
, int len
)
815 Actual_Socket s
= (Actual_Socket
) sock
;
818 * Add the data to the buffer list on the socket.
820 bufchain_add(&s
->output_data
, buf
, len
);
823 * Now try sending from the start of the buffer list.
828 return bufchain_size(&s
->output_data
);
831 static int sk_tcp_write_oob(Socket sock
, char *buf
, int len
)
833 Actual_Socket s
= (Actual_Socket
) sock
;
836 * Replace the buffer list on the socket with the data.
838 bufchain_clear(&s
->output_data
);
839 assert(len
<= sizeof(s
->oobdata
));
840 memcpy(s
->oobdata
, buf
, len
);
841 s
->sending_oob
= len
;
844 * Now try sending from the start of the buffer list.
849 return s
->sending_oob
;
852 int select_result(WPARAM wParam
, LPARAM lParam
)
856 char buf
[20480]; /* nice big buffer for plenty of speed */
860 /* wParam is the socket itself */
861 s
= find234(sktree
, (void *) wParam
, cmpforsearch
);
863 return 1; /* boggle */
865 if ((err
= WSAGETSELECTERROR(lParam
)) != 0) {
867 * An error has occurred on this socket. Pass it to the
870 return plug_closing(s
->plug
, winsock_error_string(err
), err
, 0);
873 noise_ultralight(lParam
);
875 switch (WSAGETSELECTEVENT(lParam
)) {
877 s
->connected
= s
->writable
= 1;
880 /* In the case the socket is still frozen, we don't even bother */
882 s
->frozen_readable
= 1;
887 * We have received data on the socket. For an oobinline
888 * socket, this might be data _before_ an urgent pointer,
889 * in which case we send it to the back end with type==1
890 * (data prior to urgent).
894 ioctlsocket(s
->s
, SIOCATMARK
, &atmark
);
896 * Avoid checking the return value from ioctlsocket(),
897 * on the grounds that some WinSock wrappers don't
898 * support it. If it does nothing, we get atmark==1,
899 * which is equivalent to `no OOB pending', so the
900 * effect will be to non-OOB-ify any OOB data.
905 ret
= recv(s
->s
, buf
, sizeof(buf
), 0);
906 noise_ultralight(ret
);
908 err
= WSAGetLastError();
909 if (err
== WSAEWOULDBLOCK
) {
914 return plug_closing(s
->plug
, winsock_error_string(err
), err
,
916 } else if (0 == ret
) {
917 return plug_closing(s
->plug
, NULL
, 0, 0);
919 return plug_receive(s
->plug
, atmark ?
0 : 1, buf
, ret
);
924 * This will only happen on a non-oobinline socket. It
925 * indicates that we can immediately perform an OOB read
926 * and get back OOB data, which we will send to the back
927 * end with type==2 (urgent data).
929 ret
= recv(s
->s
, buf
, sizeof(buf
), MSG_OOB
);
930 noise_ultralight(ret
);
932 fatalbox(ret
== 0 ?
"Internal networking trouble" :
933 winsock_error_string(WSAGetLastError()));
935 return plug_receive(s
->plug
, 2, buf
, ret
);
940 int bufsize_before
, bufsize_after
;
942 bufsize_before
= s
->sending_oob
+ bufchain_size(&s
->output_data
);
944 bufsize_after
= s
->sending_oob
+ bufchain_size(&s
->output_data
);
945 if (bufsize_after
< bufsize_before
)
946 plug_sent(s
->plug
, bufsize_after
);
950 /* Signal a close on the socket. First read any outstanding data. */
953 ret
= recv(s
->s
, buf
, sizeof(buf
), 0);
955 err
= WSAGetLastError();
956 if (err
== WSAEWOULDBLOCK
)
958 return plug_closing(s
->plug
, winsock_error_string(err
),
962 open
&= plug_receive(s
->plug
, 0, buf
, ret
);
964 open
&= plug_closing(s
->plug
, NULL
, 0, 0);
970 struct sockaddr_in isa
;
971 int addrlen
= sizeof(struct sockaddr_in
);
972 SOCKET t
; /* socket of connection */
974 memset(&isa
, 0, sizeof(struct sockaddr_in
));
976 t
= accept(s
->s
,&isa
,&addrlen
);
977 if (t
== INVALID_SOCKET
)
979 err
= WSAGetLastError();
980 if (err
== WSATRY_AGAIN
)
984 if (s
->localhost_only
&&
985 ntohl(isa
.sin_addr
.s_addr
) != INADDR_LOOPBACK
) {
986 closesocket(t
); /* dodgy WinSock let nonlocal through */
987 } else if (plug_accepting(s
->plug
, (void*)t
)) {
988 closesocket(t
); /* denied or error */
997 * Each socket abstraction contains a `void *' private field in
998 * which the client can keep state.
1000 void sk_set_private_ptr(Socket sock
, void *ptr
)
1002 Actual_Socket s
= (Actual_Socket
) sock
;
1003 s
->private_ptr
= ptr
;
1006 void *sk_get_private_ptr(Socket sock
)
1008 Actual_Socket s
= (Actual_Socket
) sock
;
1009 return s
->private_ptr
;
1013 * Special error values are returned from sk_namelookup and sk_new
1014 * if there's a problem. These functions extract an error message,
1015 * or return NULL if there's no problem.
1017 char *sk_addr_error(SockAddr addr
)
1021 static char *sk_tcp_socket_error(Socket sock
)
1023 Actual_Socket s
= (Actual_Socket
) sock
;
1027 void sk_set_frozen(Socket sock
, int is_frozen
)
1029 Actual_Socket s
= (Actual_Socket
) sock
;
1030 if (s
->frozen
== is_frozen
)
1032 s
->frozen
= is_frozen
;
1033 if (!is_frozen
&& s
->frozen_readable
) {
1035 recv(s
->s
, &c
, 1, MSG_PEEK
);
1037 s
->frozen_readable
= 0;
1041 * For Plink: enumerate all sockets currently active.
1043 SOCKET
first_socket(int *state
)
1047 s
= index234(sktree
, (*state
)++);
1048 return s ? s
->s
: INVALID_SOCKET
;
1051 SOCKET
next_socket(int *state
)
1053 Actual_Socket s
= index234(sktree
, (*state
)++);
1054 return s ? s
->s
: INVALID_SOCKET
;