2 * Windows networking abstraction.
4 * For the IPv6 code in here I am indebted to Jeroen Massar and
12 #define DEFINE_PLUG_METHOD_MACROS
20 const struct in6_addr in6addr_any
= IN6ADDR_ANY_INIT
;
21 const struct in6_addr in6addr_loopback
= IN6ADDR_LOOPBACK_INIT
;
24 #define ipv4_is_loopback(addr) \
25 ((p_ntohl(addr.s_addr) & 0xFF000000L) == 0x7F000000L)
28 * We used to typedef struct Socket_tag *Socket.
30 * Since we have made the networking abstraction slightly more
31 * abstract, Socket no longer means a tcp socket (it could mean
32 * an ssl socket). So now we must use Actual_Socket when we know
33 * we are talking about a tcp socket.
35 typedef struct Socket_tag
*Actual_Socket
;
38 * Mutable state that goes with a SockAddr: stores information
39 * about where in the list of candidate IP(v*) addresses we've
42 typedef struct SockAddrStep_tag SockAddrStep
;
43 struct SockAddrStep_tag
{
45 struct addrinfo
*ai
; /* steps along addr->ais */
51 const struct socket_function_table
*fn
;
52 /* the above variable absolutely *must* be the first in this structure */
60 int frozen
; /* this causes readability notifications to be ignored */
61 int frozen_readable
; /* this means we missed at least one readability
62 * notification while we were frozen */
63 int localhost_only
; /* for listening sockets */
66 int oobinline
, nodelay
, keepalive
, privport
;
67 enum { EOF_NO
, EOF_PENDING
, EOF_SENT
} outgoingeof
;
71 int pending_error
; /* in case send() returns error */
73 * We sometimes need pairs of Socket structures to be linked:
74 * if we are listening on the same IPv6 and v4 port, for
75 * example. So here we define `parent' and `child' pointers to
78 Actual_Socket parent
, child
;
86 struct addrinfo
*ais
; /* Addresses IPv6 style. */
88 unsigned long *addresses
; /* Addresses IPv4 style. */
90 char hostname
[512]; /* Store an unresolved host name. */
94 * Which address family this address belongs to. AF_INET for IPv4;
95 * AF_INET6 for IPv6; AF_UNSPEC indicates that name resolution has
96 * not been done and a simple host name is held in this SockAddr
100 #define SOCKADDR_FAMILY(addr, step) \
101 (!(addr)->resolved ? AF_UNSPEC : \
102 (step).ai ? (step).ai->ai_family : AF_INET)
104 #define SOCKADDR_FAMILY(addr, step) \
105 (!(addr)->resolved ? AF_UNSPEC : AF_INET)
109 * Start a SockAddrStep structure to step through multiple
113 #define START_STEP(addr, step) \
114 ((step).ai = (addr)->ais, (step).curraddr = 0)
116 #define START_STEP(addr, step) \
117 ((step).curraddr = 0)
120 static tree234
*sktree
;
122 static int cmpfortree(void *av
, void *bv
)
124 Actual_Socket a
= (Actual_Socket
) av
, b
= (Actual_Socket
) bv
;
125 unsigned long as
= (unsigned long) a
->s
, bs
= (unsigned long) b
->s
;
137 static int cmpforsearch(void *av
, void *bv
)
139 Actual_Socket b
= (Actual_Socket
) bv
;
140 unsigned long as
= (unsigned long) av
, bs
= (unsigned long) b
->s
;
148 DECL_WINDOWS_FUNCTION(static, int, WSAStartup
, (WORD
, LPWSADATA
));
149 DECL_WINDOWS_FUNCTION(static, int, WSACleanup
, (void));
150 DECL_WINDOWS_FUNCTION(static, int, closesocket
, (SOCKET
));
151 DECL_WINDOWS_FUNCTION(static, u_long
, ntohl
, (u_long
));
152 DECL_WINDOWS_FUNCTION(static, u_long
, htonl
, (u_long
));
153 DECL_WINDOWS_FUNCTION(static, u_short
, htons
, (u_short
));
154 DECL_WINDOWS_FUNCTION(static, u_short
, ntohs
, (u_short
));
155 DECL_WINDOWS_FUNCTION(static, int, gethostname
, (char *, int));
156 DECL_WINDOWS_FUNCTION(static, struct hostent FAR
*, gethostbyname
,
158 DECL_WINDOWS_FUNCTION(static, struct servent FAR
*, getservbyname
,
159 (const char FAR
*, const char FAR
*));
160 DECL_WINDOWS_FUNCTION(static, unsigned long, inet_addr
, (const char FAR
*));
161 DECL_WINDOWS_FUNCTION(static, char FAR
*, inet_ntoa
, (struct in_addr
));
162 DECL_WINDOWS_FUNCTION(static, int, connect
,
163 (SOCKET
, const struct sockaddr FAR
*, int));
164 DECL_WINDOWS_FUNCTION(static, int, bind
,
165 (SOCKET
, const struct sockaddr FAR
*, int));
166 DECL_WINDOWS_FUNCTION(static, int, setsockopt
,
167 (SOCKET
, int, int, const char FAR
*, int));
168 DECL_WINDOWS_FUNCTION(static, SOCKET
, socket
, (int, int, int));
169 DECL_WINDOWS_FUNCTION(static, int, listen
, (SOCKET
, int));
170 DECL_WINDOWS_FUNCTION(static, int, send
, (SOCKET
, const char FAR
*, int, int));
171 DECL_WINDOWS_FUNCTION(static, int, shutdown
, (SOCKET
, int));
172 DECL_WINDOWS_FUNCTION(static, int, ioctlsocket
,
173 (SOCKET
, long, u_long FAR
*));
174 DECL_WINDOWS_FUNCTION(static, SOCKET
, accept
,
175 (SOCKET
, struct sockaddr FAR
*, int FAR
*));
176 DECL_WINDOWS_FUNCTION(static, int, recv
, (SOCKET
, char FAR
*, int, int));
177 DECL_WINDOWS_FUNCTION(static, int, WSAIoctl
,
178 (SOCKET
, DWORD
, LPVOID
, DWORD
, LPVOID
, DWORD
,
179 LPDWORD
, LPWSAOVERLAPPED
,
180 LPWSAOVERLAPPED_COMPLETION_ROUTINE
));
182 DECL_WINDOWS_FUNCTION(static, int, getaddrinfo
,
183 (const char *nodename
, const char *servname
,
184 const struct addrinfo
*hints
, struct addrinfo
**res
));
185 DECL_WINDOWS_FUNCTION(static, void, freeaddrinfo
, (struct addrinfo
*res
));
186 DECL_WINDOWS_FUNCTION(static, int, getnameinfo
,
187 (const struct sockaddr FAR
* sa
, socklen_t salen
,
188 char FAR
* host
, size_t hostlen
, char FAR
* serv
,
189 size_t servlen
, int flags
));
190 DECL_WINDOWS_FUNCTION(static, char *, gai_strerror
, (int ecode
));
191 DECL_WINDOWS_FUNCTION(static, int, WSAAddressToStringA
,
192 (LPSOCKADDR
, DWORD
, LPWSAPROTOCOL_INFO
,
196 static HMODULE winsock_module
= NULL
;
197 static WSADATA wsadata
;
199 static HMODULE winsock2_module
= NULL
;
200 static HMODULE wship6_module
= NULL
;
203 int sk_startup(int hi
, int lo
)
207 winsock_ver
= MAKEWORD(hi
, lo
);
209 if (p_WSAStartup(winsock_ver
, &wsadata
)) {
213 if (LOBYTE(wsadata
.wVersion
) != LOBYTE(winsock_ver
)) {
217 #ifdef NET_SETUP_DIAGNOSTICS
220 sprintf(buf
, "Using WinSock %d.%d", hi
, lo
);
232 winsock_module
= load_system32_dll("ws2_32.dll");
233 if (!winsock_module
) {
234 winsock_module
= load_system32_dll("wsock32.dll");
237 fatalbox("Unable to load any WinSock library");
240 /* Check if we have getaddrinfo in Winsock */
241 if (GetProcAddress(winsock_module
, "getaddrinfo") != NULL
) {
242 #ifdef NET_SETUP_DIAGNOSTICS
243 logevent(NULL
, "Native WinSock IPv6 support detected");
245 GET_WINDOWS_FUNCTION(winsock_module
, getaddrinfo
);
246 GET_WINDOWS_FUNCTION(winsock_module
, freeaddrinfo
);
247 GET_WINDOWS_FUNCTION(winsock_module
, getnameinfo
);
248 GET_WINDOWS_FUNCTION(winsock_module
, gai_strerror
);
250 /* Fall back to wship6.dll for Windows 2000 */
251 wship6_module
= load_system32_dll("wship6.dll");
253 #ifdef NET_SETUP_DIAGNOSTICS
254 logevent(NULL
, "WSH IPv6 support detected");
256 GET_WINDOWS_FUNCTION(wship6_module
, getaddrinfo
);
257 GET_WINDOWS_FUNCTION(wship6_module
, freeaddrinfo
);
258 GET_WINDOWS_FUNCTION(wship6_module
, getnameinfo
);
259 GET_WINDOWS_FUNCTION(wship6_module
, gai_strerror
);
261 #ifdef NET_SETUP_DIAGNOSTICS
262 logevent(NULL
, "No IPv6 support detected");
266 GET_WINDOWS_FUNCTION(winsock2_module
, WSAAddressToStringA
);
268 #ifdef NET_SETUP_DIAGNOSTICS
269 logevent(NULL
, "PuTTY was built without IPv6 support");
273 GET_WINDOWS_FUNCTION(winsock_module
, WSAAsyncSelect
);
274 GET_WINDOWS_FUNCTION(winsock_module
, WSAEventSelect
);
275 GET_WINDOWS_FUNCTION(winsock_module
, select
);
276 GET_WINDOWS_FUNCTION(winsock_module
, WSAGetLastError
);
277 GET_WINDOWS_FUNCTION(winsock_module
, WSAEnumNetworkEvents
);
278 GET_WINDOWS_FUNCTION(winsock_module
, WSAStartup
);
279 GET_WINDOWS_FUNCTION(winsock_module
, WSACleanup
);
280 GET_WINDOWS_FUNCTION(winsock_module
, closesocket
);
281 GET_WINDOWS_FUNCTION(winsock_module
, ntohl
);
282 GET_WINDOWS_FUNCTION(winsock_module
, htonl
);
283 GET_WINDOWS_FUNCTION(winsock_module
, htons
);
284 GET_WINDOWS_FUNCTION(winsock_module
, ntohs
);
285 GET_WINDOWS_FUNCTION(winsock_module
, gethostname
);
286 GET_WINDOWS_FUNCTION(winsock_module
, gethostbyname
);
287 GET_WINDOWS_FUNCTION(winsock_module
, getservbyname
);
288 GET_WINDOWS_FUNCTION(winsock_module
, inet_addr
);
289 GET_WINDOWS_FUNCTION(winsock_module
, inet_ntoa
);
290 GET_WINDOWS_FUNCTION(winsock_module
, connect
);
291 GET_WINDOWS_FUNCTION(winsock_module
, bind
);
292 GET_WINDOWS_FUNCTION(winsock_module
, setsockopt
);
293 GET_WINDOWS_FUNCTION(winsock_module
, socket
);
294 GET_WINDOWS_FUNCTION(winsock_module
, listen
);
295 GET_WINDOWS_FUNCTION(winsock_module
, send
);
296 GET_WINDOWS_FUNCTION(winsock_module
, shutdown
);
297 GET_WINDOWS_FUNCTION(winsock_module
, ioctlsocket
);
298 GET_WINDOWS_FUNCTION(winsock_module
, accept
);
299 GET_WINDOWS_FUNCTION(winsock_module
, recv
);
300 GET_WINDOWS_FUNCTION(winsock_module
, WSAIoctl
);
302 /* Try to get the best WinSock version we can get */
303 if (!sk_startup(2,2) &&
306 fatalbox("Unable to initialise WinSock");
309 sktree
= newtree234(cmpfortree
);
312 void sk_cleanup(void)
318 for (i
= 0; (s
= index234(sktree
, i
)) != NULL
; i
++) {
328 FreeLibrary(winsock_module
);
331 FreeLibrary(wship6_module
);
340 static int errstring_find(void *av
, void *bv
)
343 struct errstring
*b
= (struct errstring
*)bv
;
350 static int errstring_compare(void *av
, void *bv
)
352 struct errstring
*a
= (struct errstring
*)av
;
353 return errstring_find(&a
->error
, bv
);
356 static tree234
*errstrings
= NULL
;
358 char *winsock_error_string(int error
)
360 const char prefix
[] = "Network error: ";
361 struct errstring
*es
;
364 * Error codes we know about and have historically had reasonably
365 * sensible error messages for.
369 return "Network error: Permission denied";
371 return "Network error: Address already in use";
372 case WSAEADDRNOTAVAIL
:
373 return "Network error: Cannot assign requested address";
374 case WSAEAFNOSUPPORT
:
376 "Network error: Address family not supported by protocol family";
378 return "Network error: Operation already in progress";
379 case WSAECONNABORTED
:
380 return "Network error: Software caused connection abort";
381 case WSAECONNREFUSED
:
382 return "Network error: Connection refused";
384 return "Network error: Connection reset by peer";
385 case WSAEDESTADDRREQ
:
386 return "Network error: Destination address required";
388 return "Network error: Bad address";
390 return "Network error: Host is down";
391 case WSAEHOSTUNREACH
:
392 return "Network error: No route to host";
394 return "Network error: Operation now in progress";
396 return "Network error: Interrupted function call";
398 return "Network error: Invalid argument";
400 return "Network error: Socket is already connected";
402 return "Network error: Too many open files";
404 return "Network error: Message too long";
406 return "Network error: Network is down";
408 return "Network error: Network dropped connection on reset";
410 return "Network error: Network is unreachable";
412 return "Network error: No buffer space available";
414 return "Network error: Bad protocol option";
416 return "Network error: Socket is not connected";
418 return "Network error: Socket operation on non-socket";
420 return "Network error: Operation not supported";
421 case WSAEPFNOSUPPORT
:
422 return "Network error: Protocol family not supported";
424 return "Network error: Too many processes";
425 case WSAEPROTONOSUPPORT
:
426 return "Network error: Protocol not supported";
428 return "Network error: Protocol wrong type for socket";
430 return "Network error: Cannot send after socket shutdown";
431 case WSAESOCKTNOSUPPORT
:
432 return "Network error: Socket type not supported";
434 return "Network error: Connection timed out";
436 return "Network error: Resource temporarily unavailable";
438 return "Network error: Graceful shutdown in progress";
442 * Generic code to handle any other error.
444 * Slightly nasty hack here: we want to return a static string
445 * which the caller will never have to worry about freeing, but on
446 * the other hand if we call FormatMessage to get it then it will
447 * want to either allocate a buffer or write into one we own.
449 * So what we do is to maintain a tree234 of error strings we've
450 * already used. New ones are allocated from the heap, but then
451 * put in this tree and kept forever.
455 errstrings
= newtree234(errstring_compare
);
457 es
= find234(errstrings
, &error
, errstring_find
);
460 int bufsize
, bufused
;
462 es
= snew(struct errstring
);
464 /* maximum size for FormatMessage is 64K */
465 bufsize
= 65535 + sizeof(prefix
);
466 es
->text
= snewn(bufsize
, char);
467 strcpy(es
->text
, prefix
);
468 bufused
= strlen(es
->text
);
469 if (!FormatMessage((FORMAT_MESSAGE_FROM_SYSTEM
|
470 FORMAT_MESSAGE_IGNORE_INSERTS
), NULL
, error
,
471 MAKELANGID(LANG_NEUTRAL
, SUBLANG_DEFAULT
),
472 es
->text
+ bufused
, bufsize
- bufused
, NULL
)) {
473 sprintf(es
->text
+ bufused
,
474 "Windows error code %d (and FormatMessage returned %d)",
475 error
, GetLastError());
477 int len
= strlen(es
->text
);
478 if (len
> 0 && es
->text
[len
-1] == '\n')
479 es
->text
[len
-1] = '\0';
481 es
->text
= sresize(es
->text
, strlen(es
->text
) + 1, char);
482 add234(errstrings
, es
);
488 SockAddr
sk_namelookup(const char *host
, char **canonicalname
,
491 SockAddr ret
= snew(struct SockAddr_tag
);
496 /* Default to IPv4. */
497 hint_family
= (address_family
== ADDRTYPE_IPV4 ? AF_INET
:
499 address_family
== ADDRTYPE_IPV6 ? AF_INET6
:
503 /* Clear the structure and default to IPv4. */
504 memset(ret
, 0, sizeof(struct SockAddr_tag
));
508 ret
->addresses
= NULL
;
509 ret
->resolved
= FALSE
;
513 if ((a
= p_inet_addr(host
)) == (unsigned long) INADDR_NONE
) {
514 struct hostent
*h
= NULL
;
518 * Use getaddrinfo when it's available
521 struct addrinfo hints
;
522 #ifdef NET_SETUP_DIAGNOSTICS
523 logevent(NULL
, "Using getaddrinfo() for resolving");
525 memset(&hints
, 0, sizeof(hints
));
526 hints
.ai_family
= hint_family
;
527 hints
.ai_flags
= AI_CANONNAME
;
528 if ((err
= p_getaddrinfo(host
, NULL
, &hints
, &ret
->ais
)) == 0)
529 ret
->resolved
= TRUE
;
533 #ifdef NET_SETUP_DIAGNOSTICS
534 logevent(NULL
, "Using gethostbyname() for resolving");
537 * Otherwise use the IPv4-only gethostbyname...
538 * (NOTE: we don't use gethostbyname as a fallback!)
540 if ( (h
= p_gethostbyname(host
)) )
541 ret
->resolved
= TRUE
;
543 err
= p_WSAGetLastError();
546 if (!ret
->resolved
) {
547 ret
->error
= (err
== WSAENETDOWN ?
"Network is down" :
548 err
== WSAHOST_NOT_FOUND ?
"Host does not exist" :
549 err
== WSATRY_AGAIN ?
"Host not found" :
551 p_getaddrinfo
&&p_gai_strerror ?
p_gai_strerror(err
) :
553 "gethostbyname: unknown error");
558 /* If we got an address info use that... */
560 /* Are we in IPv4 fallback mode? */
561 /* We put the IPv4 address into the a variable so we can further-on use the IPv4 code... */
562 if (ret
->ais
->ai_family
== AF_INET
)
564 (char *) &((SOCKADDR_IN
*) ret
->ais
->
565 ai_addr
)->sin_addr
, sizeof(a
));
567 if (ret
->ais
->ai_canonname
)
568 strncpy(realhost
, ret
->ais
->ai_canonname
, lenof(realhost
));
570 strncpy(realhost
, host
, lenof(realhost
));
572 /* We used the IPv4-only gethostbyname()... */
577 for (n
= 0; h
->h_addr_list
[n
]; n
++);
578 ret
->addresses
= snewn(n
, unsigned long);
580 for (n
= 0; n
< ret
->naddresses
; n
++) {
581 memcpy(&a
, h
->h_addr_list
[n
], sizeof(a
));
582 ret
->addresses
[n
] = p_ntohl(a
);
584 memcpy(&a
, h
->h_addr
, sizeof(a
));
585 /* This way we are always sure the h->h_name is valid :) */
586 strncpy(realhost
, h
->h_name
, sizeof(realhost
));
591 * This must be a numeric IPv4 address because it caused a
592 * success return from inet_addr.
594 ret
->addresses
= snewn(1, unsigned long);
596 ret
->addresses
[0] = p_ntohl(a
);
597 ret
->resolved
= TRUE
;
598 strncpy(realhost
, host
, sizeof(realhost
));
600 realhost
[lenof(realhost
)-1] = '\0';
601 *canonicalname
= snewn(1+strlen(realhost
), char);
602 strcpy(*canonicalname
, realhost
);
606 SockAddr
sk_nonamelookup(const char *host
)
608 SockAddr ret
= snew(struct SockAddr_tag
);
610 ret
->resolved
= FALSE
;
614 ret
->addresses
= NULL
;
617 strncpy(ret
->hostname
, host
, lenof(ret
->hostname
));
618 ret
->hostname
[lenof(ret
->hostname
)-1] = '\0';
622 int sk_nextaddr(SockAddr addr
, SockAddrStep
*step
)
626 if (step
->ai
->ai_next
) {
627 step
->ai
= step
->ai
->ai_next
;
633 if (step
->curraddr
+1 < addr
->naddresses
) {
641 void sk_getaddr(SockAddr addr
, char *buf
, int buflen
)
644 START_STEP(addr
, step
);
649 if (p_WSAAddressToStringA
) {
650 DWORD dwbuflen
= buflen
;
651 err
= p_WSAAddressToStringA(step
.ai
->ai_addr
, step
.ai
->ai_addrlen
,
652 NULL
, buf
, &dwbuflen
);
656 strncpy(buf
, addr
->hostname
, buflen
);
658 strncpy(buf
, "<unknown>", buflen
);
659 buf
[buflen
-1] = '\0';
663 if (SOCKADDR_FAMILY(addr
, step
) == AF_INET
) {
665 assert(addr
->addresses
&& step
.curraddr
< addr
->naddresses
);
666 a
.s_addr
= p_htonl(addr
->addresses
[step
.curraddr
]);
667 strncpy(buf
, p_inet_ntoa(a
), buflen
);
668 buf
[buflen
-1] = '\0';
670 strncpy(buf
, addr
->hostname
, buflen
);
671 buf
[buflen
-1] = '\0';
675 int sk_hostname_is_local(char *name
)
677 return !strcmp(name
, "localhost") ||
678 !strcmp(name
, "::1") ||
679 !strncmp(name
, "127.", 4);
682 static INTERFACE_INFO local_interfaces
[16];
683 static int n_local_interfaces
; /* 0=not yet, -1=failed, >0=number */
685 static int ipv4_is_local_addr(struct in_addr addr
)
687 if (ipv4_is_loopback(addr
))
688 return 1; /* loopback addresses are local */
689 if (!n_local_interfaces
) {
690 SOCKET s
= p_socket(AF_INET
, SOCK_DGRAM
, 0);
694 p_WSAIoctl(s
, SIO_GET_INTERFACE_LIST
, NULL
, 0,
695 local_interfaces
, sizeof(local_interfaces
),
696 &retbytes
, NULL
, NULL
) == 0)
697 n_local_interfaces
= retbytes
/ sizeof(INTERFACE_INFO
);
699 logevent(NULL
, "Unable to get list of local IP addresses");
701 if (n_local_interfaces
> 0) {
703 for (i
= 0; i
< n_local_interfaces
; i
++) {
704 SOCKADDR_IN
*address
=
705 (SOCKADDR_IN
*)&local_interfaces
[i
].iiAddress
;
706 if (address
->sin_addr
.s_addr
== addr
.s_addr
)
707 return 1; /* this address is local */
710 return 0; /* this address is not local */
713 int sk_address_is_local(SockAddr addr
)
717 START_STEP(addr
, step
);
718 family
= SOCKADDR_FAMILY(addr
, step
);
721 if (family
== AF_INET6
) {
722 return IN6_IS_ADDR_LOOPBACK(&((const struct sockaddr_in6
*)step
.ai
->ai_addr
)->sin6_addr
);
725 if (family
== AF_INET
) {
728 return ipv4_is_local_addr(((struct sockaddr_in
*)step
.ai
->ai_addr
)
734 assert(addr
->addresses
&& step
.curraddr
< addr
->naddresses
);
735 a
.s_addr
= p_htonl(addr
->addresses
[step
.curraddr
]);
736 return ipv4_is_local_addr(a
);
739 assert(family
== AF_UNSPEC
);
740 return 0; /* we don't know; assume not */
744 int sk_address_is_special_local(SockAddr addr
)
746 return 0; /* no Unix-domain socket analogue here */
749 int sk_addrtype(SockAddr addr
)
753 START_STEP(addr
, step
);
754 family
= SOCKADDR_FAMILY(addr
, step
);
756 return (family
== AF_INET ? ADDRTYPE_IPV4
:
758 family
== AF_INET6 ? ADDRTYPE_IPV6
:
763 void sk_addrcopy(SockAddr addr
, char *buf
)
767 START_STEP(addr
, step
);
768 family
= SOCKADDR_FAMILY(addr
, step
);
770 assert(family
!= AF_UNSPEC
);
773 if (family
== AF_INET
)
774 memcpy(buf
, &((struct sockaddr_in
*)step
.ai
->ai_addr
)->sin_addr
,
775 sizeof(struct in_addr
));
776 else if (family
== AF_INET6
)
777 memcpy(buf
, &((struct sockaddr_in6
*)step
.ai
->ai_addr
)->sin6_addr
,
778 sizeof(struct in6_addr
));
783 if (family
== AF_INET
) {
785 assert(addr
->addresses
&& step
.curraddr
< addr
->naddresses
);
786 a
.s_addr
= p_htonl(addr
->addresses
[step
.curraddr
]);
787 memcpy(buf
, (char*) &a
.s_addr
, 4);
791 void sk_addr_free(SockAddr addr
)
793 if (--addr
->refcount
> 0)
796 if (addr
->ais
&& p_freeaddrinfo
)
797 p_freeaddrinfo(addr
->ais
);
800 sfree(addr
->addresses
);
804 SockAddr
sk_addr_dup(SockAddr addr
)
810 static Plug
sk_tcp_plug(Socket sock
, Plug p
)
812 Actual_Socket s
= (Actual_Socket
) sock
;
819 static void sk_tcp_flush(Socket s
)
822 * We send data to the socket as soon as we can anyway,
823 * so we don't need to do anything here. :-)
827 static void sk_tcp_close(Socket s
);
828 static int sk_tcp_write(Socket s
, const char *data
, int len
);
829 static int sk_tcp_write_oob(Socket s
, const char *data
, int len
);
830 static void sk_tcp_write_eof(Socket s
);
831 static void sk_tcp_set_private_ptr(Socket s
, void *ptr
);
832 static void *sk_tcp_get_private_ptr(Socket s
);
833 static void sk_tcp_set_frozen(Socket s
, int is_frozen
);
834 static const char *sk_tcp_socket_error(Socket s
);
836 extern char *do_select(SOCKET skt
, int startup
);
838 Socket
sk_register(void *sock
, Plug plug
)
840 static const struct socket_function_table fn_table
= {
847 sk_tcp_set_private_ptr
,
848 sk_tcp_get_private_ptr
,
858 * Create Socket structure.
860 ret
= snew(struct Socket_tag
);
864 bufchain_init(&ret
->output_data
);
865 ret
->writable
= 1; /* to start with */
866 ret
->sending_oob
= 0;
867 ret
->outgoingeof
= EOF_NO
;
869 ret
->frozen_readable
= 0;
870 ret
->localhost_only
= 0; /* unused, but best init anyway */
871 ret
->pending_error
= 0;
872 ret
->parent
= ret
->child
= NULL
;
875 ret
->s
= (SOCKET
)sock
;
877 if (ret
->s
== INVALID_SOCKET
) {
878 err
= p_WSAGetLastError();
879 ret
->error
= winsock_error_string(err
);
885 /* Set up a select mechanism. This could be an AsyncSelect on a
886 * window, or an EventSelect on an event object. */
887 errstr
= do_select(ret
->s
, 1);
898 static DWORD
try_connect(Actual_Socket sock
)
910 if (sock
->s
!= INVALID_SOCKET
) {
911 do_select(sock
->s
, 0);
912 p_closesocket(sock
->s
);
915 plug_log(sock
->plug
, 0, sock
->addr
, sock
->port
, NULL
, 0);
920 family
= SOCKADDR_FAMILY(sock
->addr
, sock
->step
);
923 * Remove the socket from the tree before we overwrite its
924 * internal socket id, because that forms part of the tree's
925 * sorting criterion. We'll add it back before exiting this
926 * function, whether we changed anything or not.
928 del234(sktree
, sock
);
930 s
= p_socket(family
, SOCK_STREAM
, 0);
933 if (s
== INVALID_SOCKET
) {
934 err
= p_WSAGetLastError();
935 sock
->error
= winsock_error_string(err
);
939 if (sock
->oobinline
) {
941 p_setsockopt(s
, SOL_SOCKET
, SO_OOBINLINE
, (void *) &b
, sizeof(b
));
946 p_setsockopt(s
, IPPROTO_TCP
, TCP_NODELAY
, (void *) &b
, sizeof(b
));
949 if (sock
->keepalive
) {
951 p_setsockopt(s
, SOL_SOCKET
, SO_KEEPALIVE
, (void *) &b
, sizeof(b
));
955 * Bind to local address.
958 localport
= 1023; /* count from 1023 downwards */
960 localport
= 0; /* just use port 0 (ie winsock picks) */
962 /* Loop round trying to bind */
967 if (family
== AF_INET6
) {
968 memset(&a6
, 0, sizeof(a6
));
969 a6
.sin6_family
= AF_INET6
;
970 /*a6.sin6_addr = in6addr_any; */ /* == 0 done by memset() */
971 a6
.sin6_port
= p_htons(localport
);
975 a
.sin_family
= AF_INET
;
976 a
.sin_addr
.s_addr
= p_htonl(INADDR_ANY
);
977 a
.sin_port
= p_htons(localport
);
980 sockcode
= p_bind(s
, (family
== AF_INET6 ?
981 (struct sockaddr
*) &a6
:
982 (struct sockaddr
*) &a
),
983 (family
== AF_INET6 ?
sizeof(a6
) : sizeof(a
)));
985 sockcode
= p_bind(s
, (struct sockaddr
*) &a
, sizeof(a
));
987 if (sockcode
!= SOCKET_ERROR
) {
991 err
= p_WSAGetLastError();
992 if (err
!= WSAEADDRINUSE
) /* failed, for a bad reason */
997 break; /* we're only looping once */
1000 break; /* we might have got to the end */
1004 sock
->error
= winsock_error_string(err
);
1009 * Connect to remote address.
1012 if (sock
->step
.ai
) {
1013 if (family
== AF_INET6
) {
1014 a6
.sin6_family
= AF_INET6
;
1015 a6
.sin6_port
= p_htons((short) sock
->port
);
1017 ((struct sockaddr_in6
*) sock
->step
.ai
->ai_addr
)->sin6_addr
;
1018 a6
.sin6_flowinfo
= ((struct sockaddr_in6
*) sock
->step
.ai
->ai_addr
)->sin6_flowinfo
;
1019 a6
.sin6_scope_id
= ((struct sockaddr_in6
*) sock
->step
.ai
->ai_addr
)->sin6_scope_id
;
1021 a
.sin_family
= AF_INET
;
1023 ((struct sockaddr_in
*) sock
->step
.ai
->ai_addr
)->sin_addr
;
1024 a
.sin_port
= p_htons((short) sock
->port
);
1029 assert(sock
->addr
->addresses
&& sock
->step
.curraddr
< sock
->addr
->naddresses
);
1030 a
.sin_family
= AF_INET
;
1031 a
.sin_addr
.s_addr
= p_htonl(sock
->addr
->addresses
[sock
->step
.curraddr
]);
1032 a
.sin_port
= p_htons((short) sock
->port
);
1035 /* Set up a select mechanism. This could be an AsyncSelect on a
1036 * window, or an EventSelect on an event object. */
1037 errstr
= do_select(s
, 1);
1039 sock
->error
= errstr
;
1047 ((family
== AF_INET6
) ?
(struct sockaddr
*) &a6
:
1048 (struct sockaddr
*) &a
),
1049 (family
== AF_INET6
) ?
sizeof(a6
) : sizeof(a
))
1051 p_connect(s
, (struct sockaddr
*) &a
, sizeof(a
))
1053 ) == SOCKET_ERROR
) {
1054 err
= p_WSAGetLastError();
1056 * We expect a potential EWOULDBLOCK here, because the
1057 * chances are the front end has done a select for
1058 * FD_CONNECT, so that connect() will complete
1061 if ( err
!= WSAEWOULDBLOCK
) {
1062 sock
->error
= winsock_error_string(err
);
1067 * If we _don't_ get EWOULDBLOCK, the connect has completed
1068 * and we should set the socket as writable.
1078 * No matter what happened, put the socket back in the tree.
1080 add234(sktree
, sock
);
1083 plug_log(sock
->plug
, 1, sock
->addr
, sock
->port
, sock
->error
, err
);
1087 Socket
sk_new(SockAddr addr
, int port
, int privport
, int oobinline
,
1088 int nodelay
, int keepalive
, Plug plug
)
1090 static const struct socket_function_table fn_table
= {
1097 sk_tcp_set_private_ptr
,
1098 sk_tcp_get_private_ptr
,
1107 * Create Socket structure.
1109 ret
= snew(struct Socket_tag
);
1110 ret
->fn
= &fn_table
;
1113 bufchain_init(&ret
->output_data
);
1114 ret
->connected
= 0; /* to start with */
1115 ret
->writable
= 0; /* to start with */
1116 ret
->sending_oob
= 0;
1117 ret
->outgoingeof
= EOF_NO
;
1119 ret
->frozen_readable
= 0;
1120 ret
->localhost_only
= 0; /* unused, but best init anyway */
1121 ret
->pending_error
= 0;
1122 ret
->parent
= ret
->child
= NULL
;
1123 ret
->oobinline
= oobinline
;
1124 ret
->nodelay
= nodelay
;
1125 ret
->keepalive
= keepalive
;
1126 ret
->privport
= privport
;
1129 START_STEP(ret
->addr
, ret
->step
);
1130 ret
->s
= INVALID_SOCKET
;
1134 err
= try_connect(ret
);
1135 } while (err
&& sk_nextaddr(ret
->addr
, &ret
->step
));
1137 return (Socket
) ret
;
1140 Socket
sk_newlistener(char *srcaddr
, int port
, Plug plug
, int local_host_only
,
1141 int orig_address_family
)
1143 static const struct socket_function_table fn_table
= {
1150 sk_tcp_set_private_ptr
,
1151 sk_tcp_get_private_ptr
,
1171 * Create Socket structure.
1173 ret
= snew(struct Socket_tag
);
1174 ret
->fn
= &fn_table
;
1177 bufchain_init(&ret
->output_data
);
1178 ret
->writable
= 0; /* to start with */
1179 ret
->sending_oob
= 0;
1180 ret
->outgoingeof
= EOF_NO
;
1182 ret
->frozen_readable
= 0;
1183 ret
->localhost_only
= local_host_only
;
1184 ret
->pending_error
= 0;
1185 ret
->parent
= ret
->child
= NULL
;
1189 * Translate address_family from platform-independent constants
1190 * into local reality.
1192 address_family
= (orig_address_family
== ADDRTYPE_IPV4 ? AF_INET
:
1194 orig_address_family
== ADDRTYPE_IPV6 ? AF_INET6
:
1199 * Our default, if passed the `don't care' value
1200 * ADDRTYPE_UNSPEC, is to listen on IPv4. If IPv6 is supported,
1201 * we will also set up a second socket listening on IPv6, but
1202 * the v4 one is primary since that ought to work even on
1203 * non-v6-supporting systems.
1205 if (address_family
== AF_UNSPEC
) address_family
= AF_INET
;
1210 s
= p_socket(address_family
, SOCK_STREAM
, 0);
1213 if (s
== INVALID_SOCKET
) {
1214 err
= p_WSAGetLastError();
1215 ret
->error
= winsock_error_string(err
);
1216 return (Socket
) ret
;
1221 p_setsockopt(s
, SOL_SOCKET
, SO_REUSEADDR
, (const char *)&on
, sizeof(on
));
1224 if (address_family
== AF_INET6
) {
1225 memset(&a6
, 0, sizeof(a6
));
1226 a6
.sin6_family
= AF_INET6
;
1227 /* FIXME: srcaddr is ignored for IPv6, because I (SGT) don't
1228 * know how to do it. :-)
1229 * (jeroen:) saddr is specified as an address.. eg 2001:db8::1
1230 * Thus we need either a parser that understands [2001:db8::1]:80
1231 * style addresses and/or enhance this to understand hostnames too. */
1232 if (local_host_only
)
1233 a6
.sin6_addr
= in6addr_loopback
;
1235 a6
.sin6_addr
= in6addr_any
;
1236 a6
.sin6_port
= p_htons(port
);
1241 a
.sin_family
= AF_INET
;
1244 * Bind to source address. First try an explicitly
1248 a
.sin_addr
.s_addr
= p_inet_addr(srcaddr
);
1249 if (a
.sin_addr
.s_addr
!= INADDR_NONE
) {
1250 /* Override localhost_only with specified listen addr. */
1251 ret
->localhost_only
= ipv4_is_loopback(a
.sin_addr
);
1257 * ... and failing that, go with one of the standard ones.
1260 if (local_host_only
)
1261 a
.sin_addr
.s_addr
= p_htonl(INADDR_LOOPBACK
);
1263 a
.sin_addr
.s_addr
= p_htonl(INADDR_ANY
);
1266 a
.sin_port
= p_htons((short)port
);
1269 retcode
= p_bind(s
, (address_family
== AF_INET6 ?
1270 (struct sockaddr
*) &a6
:
1271 (struct sockaddr
*) &a
),
1273 AF_INET6 ?
sizeof(a6
) : sizeof(a
)));
1275 retcode
= p_bind(s
, (struct sockaddr
*) &a
, sizeof(a
));
1277 if (retcode
!= SOCKET_ERROR
) {
1280 err
= p_WSAGetLastError();
1285 ret
->error
= winsock_error_string(err
);
1286 return (Socket
) ret
;
1290 if (p_listen(s
, SOMAXCONN
) == SOCKET_ERROR
) {
1292 ret
->error
= winsock_error_string(p_WSAGetLastError());
1293 return (Socket
) ret
;
1296 /* Set up a select mechanism. This could be an AsyncSelect on a
1297 * window, or an EventSelect on an event object. */
1298 errstr
= do_select(s
, 1);
1301 ret
->error
= errstr
;
1302 return (Socket
) ret
;
1305 add234(sktree
, ret
);
1309 * If we were given ADDRTYPE_UNSPEC, we must also create an
1310 * IPv6 listening socket and link it to this one.
1312 if (address_family
== AF_INET
&& orig_address_family
== ADDRTYPE_UNSPEC
) {
1313 Actual_Socket other
;
1315 other
= (Actual_Socket
) sk_newlistener(srcaddr
, port
, plug
,
1316 local_host_only
, ADDRTYPE_IPV6
);
1319 if (!other
->error
) {
1320 other
->parent
= ret
;
1329 return (Socket
) ret
;
1332 static void sk_tcp_close(Socket sock
)
1334 extern char *do_select(SOCKET skt
, int startup
);
1335 Actual_Socket s
= (Actual_Socket
) sock
;
1338 sk_tcp_close((Socket
)s
->child
);
1342 p_closesocket(s
->s
);
1344 sk_addr_free(s
->addr
);
1349 * The function which tries to send on a socket once it's deemed
1352 void try_send(Actual_Socket s
)
1354 while (s
->sending_oob
|| bufchain_size(&s
->output_data
) > 0) {
1358 int len
, urgentflag
;
1360 if (s
->sending_oob
) {
1361 urgentflag
= MSG_OOB
;
1362 len
= s
->sending_oob
;
1366 bufchain_prefix(&s
->output_data
, &data
, &len
);
1368 nsent
= p_send(s
->s
, data
, len
, urgentflag
);
1369 noise_ultralight(nsent
);
1371 err
= (nsent
< 0 ?
p_WSAGetLastError() : 0);
1372 if ((err
< WSABASEERR
&& nsent
< 0) || err
== WSAEWOULDBLOCK
) {
1374 * Perfectly normal: we've sent all we can for the moment.
1376 * (Some WinSock send() implementations can return
1377 * <0 but leave no sensible error indication -
1378 * WSAGetLastError() is called but returns zero or
1379 * a small number - so we check that case and treat
1380 * it just like WSAEWOULDBLOCK.)
1382 s
->writable
= FALSE
;
1384 } else if (nsent
== 0 ||
1385 err
== WSAECONNABORTED
|| err
== WSAECONNRESET
) {
1387 * If send() returns CONNABORTED or CONNRESET, we
1388 * unfortunately can't just call plug_closing(),
1389 * because it's quite likely that we're currently
1390 * _in_ a call from the code we'd be calling back
1391 * to, so we'd have to make half the SSH code
1392 * reentrant. Instead we flag a pending error on
1393 * the socket, to be dealt with (by calling
1394 * plug_closing()) at some suitable future moment.
1396 s
->pending_error
= err
;
1399 /* We're inside the Windows frontend here, so we know
1400 * that the frontend handle is unnecessary. */
1401 logevent(NULL
, winsock_error_string(err
));
1402 fatalbox("%s", winsock_error_string(err
));
1405 if (s
->sending_oob
) {
1407 memmove(s
->oobdata
, s
->oobdata
+nsent
, len
-nsent
);
1408 s
->sending_oob
= len
- nsent
;
1413 bufchain_consume(&s
->output_data
, nsent
);
1419 * If we reach here, we've finished sending everything we might
1420 * have needed to send. Send EOF, if we need to.
1422 if (s
->outgoingeof
== EOF_PENDING
) {
1423 p_shutdown(s
->s
, SD_SEND
);
1424 s
->outgoingeof
= EOF_SENT
;
1428 static int sk_tcp_write(Socket sock
, const char *buf
, int len
)
1430 Actual_Socket s
= (Actual_Socket
) sock
;
1432 assert(s
->outgoingeof
== EOF_NO
);
1435 * Add the data to the buffer list on the socket.
1437 bufchain_add(&s
->output_data
, buf
, len
);
1440 * Now try sending from the start of the buffer list.
1445 return bufchain_size(&s
->output_data
);
1448 static int sk_tcp_write_oob(Socket sock
, const char *buf
, int len
)
1450 Actual_Socket s
= (Actual_Socket
) sock
;
1452 assert(s
->outgoingeof
== EOF_NO
);
1455 * Replace the buffer list on the socket with the data.
1457 bufchain_clear(&s
->output_data
);
1458 assert(len
<= sizeof(s
->oobdata
));
1459 memcpy(s
->oobdata
, buf
, len
);
1460 s
->sending_oob
= len
;
1463 * Now try sending from the start of the buffer list.
1468 return s
->sending_oob
;
1471 static void sk_tcp_write_eof(Socket sock
)
1473 Actual_Socket s
= (Actual_Socket
) sock
;
1475 assert(s
->outgoingeof
== EOF_NO
);
1478 * Mark the socket as pending outgoing EOF.
1480 s
->outgoingeof
= EOF_PENDING
;
1483 * Now try sending from the start of the buffer list.
1489 int select_result(WPARAM wParam
, LPARAM lParam
)
1493 char buf
[20480]; /* nice big buffer for plenty of speed */
1497 /* wParam is the socket itself */
1500 return 1; /* boggle */
1502 s
= find234(sktree
, (void *) wParam
, cmpforsearch
);
1504 return 1; /* boggle */
1506 if ((err
= WSAGETSELECTERROR(lParam
)) != 0) {
1508 * An error has occurred on this socket. Pass it to the
1512 plug_log(s
->plug
, 1, s
->addr
, s
->port
,
1513 winsock_error_string(err
), err
);
1514 while (s
->addr
&& sk_nextaddr(s
->addr
, &s
->step
)) {
1515 err
= try_connect(s
);
1519 return plug_closing(s
->plug
, winsock_error_string(err
), err
, 0);
1524 noise_ultralight(lParam
);
1526 switch (WSAGETSELECTEVENT(lParam
)) {
1528 s
->connected
= s
->writable
= 1;
1530 * Once a socket is connected, we can stop falling
1531 * back through the candidate addresses to connect
1535 sk_addr_free(s
->addr
);
1540 /* In the case the socket is still frozen, we don't even bother */
1542 s
->frozen_readable
= 1;
1547 * We have received data on the socket. For an oobinline
1548 * socket, this might be data _before_ an urgent pointer,
1549 * in which case we send it to the back end with type==1
1550 * (data prior to urgent).
1554 p_ioctlsocket(s
->s
, SIOCATMARK
, &atmark
);
1556 * Avoid checking the return value from ioctlsocket(),
1557 * on the grounds that some WinSock wrappers don't
1558 * support it. If it does nothing, we get atmark==1,
1559 * which is equivalent to `no OOB pending', so the
1560 * effect will be to non-OOB-ify any OOB data.
1565 ret
= p_recv(s
->s
, buf
, sizeof(buf
), 0);
1566 noise_ultralight(ret
);
1568 err
= p_WSAGetLastError();
1569 if (err
== WSAEWOULDBLOCK
) {
1574 return plug_closing(s
->plug
, winsock_error_string(err
), err
,
1576 } else if (0 == ret
) {
1577 return plug_closing(s
->plug
, NULL
, 0, 0);
1579 return plug_receive(s
->plug
, atmark ?
0 : 1, buf
, ret
);
1584 * This will only happen on a non-oobinline socket. It
1585 * indicates that we can immediately perform an OOB read
1586 * and get back OOB data, which we will send to the back
1587 * end with type==2 (urgent data).
1589 ret
= p_recv(s
->s
, buf
, sizeof(buf
), MSG_OOB
);
1590 noise_ultralight(ret
);
1592 char *str
= (ret
== 0 ?
"Internal networking trouble" :
1593 winsock_error_string(p_WSAGetLastError()));
1594 /* We're inside the Windows frontend here, so we know
1595 * that the frontend handle is unnecessary. */
1596 logevent(NULL
, str
);
1597 fatalbox("%s", str
);
1599 return plug_receive(s
->plug
, 2, buf
, ret
);
1604 int bufsize_before
, bufsize_after
;
1606 bufsize_before
= s
->sending_oob
+ bufchain_size(&s
->output_data
);
1608 bufsize_after
= s
->sending_oob
+ bufchain_size(&s
->output_data
);
1609 if (bufsize_after
< bufsize_before
)
1610 plug_sent(s
->plug
, bufsize_after
);
1614 /* Signal a close on the socket. First read any outstanding data. */
1617 ret
= p_recv(s
->s
, buf
, sizeof(buf
), 0);
1619 err
= p_WSAGetLastError();
1620 if (err
== WSAEWOULDBLOCK
)
1622 return plug_closing(s
->plug
, winsock_error_string(err
),
1626 open
&= plug_receive(s
->plug
, 0, buf
, ret
);
1628 open
&= plug_closing(s
->plug
, NULL
, 0, 0);
1635 struct sockaddr_in isa
;
1637 struct sockaddr_storage isa
;
1639 int addrlen
= sizeof(isa
);
1640 SOCKET t
; /* socket of connection */
1642 memset(&isa
, 0, sizeof(isa
));
1644 t
= p_accept(s
->s
,(struct sockaddr
*)&isa
,&addrlen
);
1645 if (t
== INVALID_SOCKET
)
1647 err
= p_WSAGetLastError();
1648 if (err
== WSATRY_AGAIN
)
1652 if (isa
.ss_family
== AF_INET
&&
1653 s
->localhost_only
&&
1654 !ipv4_is_local_addr(((struct sockaddr_in
*)&isa
)->sin_addr
))
1656 if (s
->localhost_only
&& !ipv4_is_local_addr(isa
.sin_addr
))
1659 p_closesocket(t
); /* dodgy WinSock let nonlocal through */
1660 } else if (plug_accepting(s
->plug
, (void*)t
)) {
1661 p_closesocket(t
); /* denied or error */
1670 * Deal with socket errors detected in try_send().
1672 void net_pending_errors(void)
1678 * This might be a fiddly business, because it's just possible
1679 * that handling a pending error on one socket might cause
1680 * others to be closed. (I can't think of any reason this might
1681 * happen in current SSH implementation, but to maintain
1682 * generality of this network layer I'll assume the worst.)
1684 * So what we'll do is search the socket list for _one_ socket
1685 * with a pending error, and then handle it, and then search
1686 * the list again _from the beginning_. Repeat until we make a
1687 * pass with no socket errors present. That way we are
1688 * protected against the socket list changing under our feet.
1692 for (i
= 0; (s
= index234(sktree
, i
)) != NULL
; i
++) {
1693 if (s
->pending_error
) {
1695 * An error has occurred on this socket. Pass it to the
1698 plug_closing(s
->plug
,
1699 winsock_error_string(s
->pending_error
),
1700 s
->pending_error
, 0);
1708 * Each socket abstraction contains a `void *' private field in
1709 * which the client can keep state.
1711 static void sk_tcp_set_private_ptr(Socket sock
, void *ptr
)
1713 Actual_Socket s
= (Actual_Socket
) sock
;
1714 s
->private_ptr
= ptr
;
1717 static void *sk_tcp_get_private_ptr(Socket sock
)
1719 Actual_Socket s
= (Actual_Socket
) sock
;
1720 return s
->private_ptr
;
1724 * Special error values are returned from sk_namelookup and sk_new
1725 * if there's a problem. These functions extract an error message,
1726 * or return NULL if there's no problem.
1728 const char *sk_addr_error(SockAddr addr
)
1732 static const char *sk_tcp_socket_error(Socket sock
)
1734 Actual_Socket s
= (Actual_Socket
) sock
;
1738 static void sk_tcp_set_frozen(Socket sock
, int is_frozen
)
1740 Actual_Socket s
= (Actual_Socket
) sock
;
1741 if (s
->frozen
== is_frozen
)
1743 s
->frozen
= is_frozen
;
1746 if (s
->frozen_readable
) {
1748 p_recv(s
->s
, &c
, 1, MSG_PEEK
);
1751 s
->frozen_readable
= 0;
1754 void socket_reselect_all(void)
1759 for (i
= 0; (s
= index234(sktree
, i
)) != NULL
; i
++) {
1766 * For Plink: enumerate all sockets currently active.
1768 SOCKET
first_socket(int *state
)
1772 s
= index234(sktree
, (*state
)++);
1773 return s ? s
->s
: INVALID_SOCKET
;
1776 SOCKET
next_socket(int *state
)
1778 Actual_Socket s
= index234(sktree
, (*state
)++);
1779 return s ? s
->s
: INVALID_SOCKET
;
1782 extern int socket_writable(SOCKET skt
)
1784 Actual_Socket s
= find234(sktree
, (void *)skt
, cmpforsearch
);
1787 return bufchain_size(&s
->output_data
) > 0;
1792 int net_service_lookup(char *service
)
1795 se
= p_getservbyname(service
, NULL
);
1797 return p_ntohs(se
->s_port
);
1802 char *get_hostname(void)
1805 char *hostname
= NULL
;
1808 hostname
= sresize(hostname
, len
, char);
1809 if (p_gethostname(hostname
, len
) < 0) {
1814 } while (strlen(hostname
) >= (size_t)(len
-1));
1818 SockAddr
platform_get_x11_unix_address(const char *display
, int displaynum
,
1819 char **canonicalname
)
1821 SockAddr ret
= snew(struct SockAddr_tag
);
1822 memset(ret
, 0, sizeof(struct SockAddr_tag
));
1823 ret
->error
= "unix sockets not supported on this platform";