2f75bae1 |
1 | /* |
2 | * Windows networking abstraction. |
c4d8e107 |
3 | * |
4 | * Due to this clean abstraction it was possible |
5 | * to easily implement IPv6 support :) |
6 | * |
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. |
12 | * |
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. |
16 | * |
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. |
27 | * |
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... |
31 | * |
2f75bae1 |
32 | */ |
33 | |
c4d8e107 |
34 | /* |
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. |
38 | */ |
39 | /* #define IPV6 1 */ |
40 | |
41 | #ifdef IPV6 |
42 | #include <winsock2.h> |
43 | #include <ws2tcpip.h> |
44 | #include <tpipv6.h> |
45 | #else |
2f75bae1 |
46 | #include <winsock.h> |
c4d8e107 |
47 | #endif |
48 | #include <windows.h> |
2f75bae1 |
49 | #include <stdio.h> |
49bad831 |
50 | #include <stdlib.h> |
5471d09a |
51 | #include <assert.h> |
2f75bae1 |
52 | |
7e78000d |
53 | #define DEFINE_PLUG_METHOD_MACROS |
2f75bae1 |
54 | #include "putty.h" |
55 | #include "network.h" |
56 | #include "tree234.h" |
57 | |
2f75bae1 |
58 | struct Socket_tag { |
7e78000d |
59 | struct socket_function_table *fn; |
60 | /* the above variable absolutely *must* be the first in this structure */ |
2f75bae1 |
61 | char *error; |
62 | SOCKET s; |
7e78000d |
63 | Plug plug; |
2f75bae1 |
64 | void *private_ptr; |
5471d09a |
65 | bufchain output_data; |
3ad9d396 |
66 | int connected; |
2f75bae1 |
67 | int writable; |
5471d09a |
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 */ |
bc4802a1 |
71 | int localhost_only; /* for listening sockets */ |
5471d09a |
72 | char oobdata[1]; |
1ad4eb6f |
73 | int sending_oob; |
4b1e8acc |
74 | int oobinline; |
7732d38a |
75 | int pending_error; /* in case send() returns error */ |
2f75bae1 |
76 | }; |
77 | |
7e78000d |
78 | /* |
79 | * We used to typedef struct Socket_tag *Socket. |
80 | * |
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. |
85 | */ |
86 | typedef struct Socket_tag *Actual_Socket; |
87 | |
2f75bae1 |
88 | struct SockAddr_tag { |
89 | char *error; |
c4d8e107 |
90 | /* address family this belongs to, AF_INET for IPv4, AF_INET6 for IPv6. */ |
32874aea |
91 | int family; |
c4d8e107 |
92 | unsigned long address; /* Address IPv4 style. */ |
93 | #ifdef IPV6 |
94 | struct addrinfo *ai; /* Address IPv6 style. */ |
95 | #endif |
2f75bae1 |
96 | }; |
97 | |
2f75bae1 |
98 | static tree234 *sktree; |
99 | |
32874aea |
100 | static int cmpfortree(void *av, void *bv) |
101 | { |
102 | Actual_Socket a = (Actual_Socket) av, b = (Actual_Socket) bv; |
103 | unsigned long as = (unsigned long) a->s, bs = (unsigned long) b->s; |
104 | if (as < bs) |
105 | return -1; |
106 | if (as > bs) |
107 | return +1; |
2f75bae1 |
108 | return 0; |
109 | } |
110 | |
32874aea |
111 | static int cmpforsearch(void *av, void *bv) |
112 | { |
113 | Actual_Socket b = (Actual_Socket) bv; |
114 | unsigned long as = (unsigned long) av, bs = (unsigned long) b->s; |
115 | if (as < bs) |
116 | return -1; |
117 | if (as > bs) |
118 | return +1; |
2f75bae1 |
119 | return 0; |
120 | } |
121 | |
32874aea |
122 | void sk_init(void) |
123 | { |
2f75bae1 |
124 | sktree = newtree234(cmpfortree); |
125 | } |
126 | |
93b581bd |
127 | void sk_cleanup(void) |
128 | { |
129 | Actual_Socket s; |
130 | int i; |
131 | |
132 | if (sktree) { |
133 | for (i = 0; (s = index234(sktree, i)) != NULL; i++) { |
134 | closesocket(s->s); |
135 | } |
136 | } |
137 | } |
138 | |
32874aea |
139 | char *winsock_error_string(int error) |
140 | { |
e74fbad9 |
141 | switch (error) { |
32874aea |
142 | case WSAEACCES: |
143 | return "Network error: Permission denied"; |
144 | case WSAEADDRINUSE: |
145 | return "Network error: Address already in use"; |
146 | case WSAEADDRNOTAVAIL: |
147 | return "Network error: Cannot assign requested address"; |
148 | case WSAEAFNOSUPPORT: |
149 | return |
150 | "Network error: Address family not supported by protocol family"; |
151 | case WSAEALREADY: |
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"; |
157 | case WSAECONNRESET: |
158 | return "Network error: Connection reset by peer"; |
159 | case WSAEDESTADDRREQ: |
160 | return "Network error: Destination address required"; |
161 | case WSAEFAULT: |
162 | return "Network error: Bad address"; |
163 | case WSAEHOSTDOWN: |
164 | return "Network error: Host is down"; |
165 | case WSAEHOSTUNREACH: |
166 | return "Network error: No route to host"; |
167 | case WSAEINPROGRESS: |
168 | return "Network error: Operation now in progress"; |
169 | case WSAEINTR: |
170 | return "Network error: Interrupted function call"; |
171 | case WSAEINVAL: |
172 | return "Network error: Invalid argument"; |
173 | case WSAEISCONN: |
174 | return "Network error: Socket is already connected"; |
175 | case WSAEMFILE: |
176 | return "Network error: Too many open files"; |
177 | case WSAEMSGSIZE: |
178 | return "Network error: Message too long"; |
179 | case WSAENETDOWN: |
180 | return "Network error: Network is down"; |
181 | case WSAENETRESET: |
182 | return "Network error: Network dropped connection on reset"; |
183 | case WSAENETUNREACH: |
184 | return "Network error: Network is unreachable"; |
185 | case WSAENOBUFS: |
186 | return "Network error: No buffer space available"; |
187 | case WSAENOPROTOOPT: |
188 | return "Network error: Bad protocol option"; |
189 | case WSAENOTCONN: |
190 | return "Network error: Socket is not connected"; |
191 | case WSAENOTSOCK: |
192 | return "Network error: Socket operation on non-socket"; |
193 | case WSAEOPNOTSUPP: |
194 | return "Network error: Operation not supported"; |
195 | case WSAEPFNOSUPPORT: |
196 | return "Network error: Protocol family not supported"; |
197 | case WSAEPROCLIM: |
198 | return "Network error: Too many processes"; |
199 | case WSAEPROTONOSUPPORT: |
200 | return "Network error: Protocol not supported"; |
201 | case WSAEPROTOTYPE: |
202 | return "Network error: Protocol wrong type for socket"; |
203 | case WSAESHUTDOWN: |
204 | return "Network error: Cannot send after socket shutdown"; |
205 | case WSAESOCKTNOSUPPORT: |
206 | return "Network error: Socket type not supported"; |
207 | case WSAETIMEDOUT: |
208 | return "Network error: Connection timed out"; |
209 | case WSAEWOULDBLOCK: |
210 | return "Network error: Resource temporarily unavailable"; |
211 | case WSAEDISCON: |
212 | return "Network error: Graceful shutdown in progress"; |
213 | default: |
214 | return "Unknown network error"; |
e74fbad9 |
215 | } |
216 | } |
217 | |
c4d8e107 |
218 | SockAddr sk_namelookup(char *host, char **canonicalname) |
219 | { |
2f75bae1 |
220 | SockAddr ret = smalloc(sizeof(struct SockAddr_tag)); |
221 | unsigned long a; |
c4d8e107 |
222 | struct hostent *h = NULL; |
6e1ebb76 |
223 | char realhost[8192]; |
2f75bae1 |
224 | |
c4d8e107 |
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. */ |
6e1ebb76 |
228 | *realhost = '\0'; |
c4d8e107 |
229 | |
32874aea |
230 | if ((a = inet_addr(host)) == (unsigned long) INADDR_NONE) { |
c4d8e107 |
231 | #ifdef IPV6 |
232 | |
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. */ |
32874aea |
236 | typedef int (CALLBACK * FGETADDRINFO) (const char *nodename, |
237 | const char *servname, |
238 | const struct addrinfo * |
239 | hints, |
240 | struct addrinfo ** res); |
c4d8e107 |
241 | FGETADDRINFO fGetAddrInfo = NULL; |
242 | |
243 | HINSTANCE dllWSHIP6 = LoadLibrary("wship6.dll"); |
244 | if (dllWSHIP6) |
32874aea |
245 | fGetAddrInfo = (FGETADDRINFO) GetProcAddress(dllWSHIP6, |
246 | "getaddrinfo"); |
c4d8e107 |
247 | |
248 | /* |
249 | * Use fGetAddrInfo when it's available (which usually also |
250 | * means IPv6 is installed...) |
251 | */ |
32874aea |
252 | if (fGetAddrInfo) { |
c4d8e107 |
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; |
32874aea |
256 | } else |
c4d8e107 |
257 | #endif |
32874aea |
258 | { |
c4d8e107 |
259 | /* |
260 | * Otherwise use the IPv4-only gethostbyname... |
261 | * (NOTE: we don't use gethostbyname as a |
262 | * fallback!) |
263 | */ |
32874aea |
264 | if (ret->family == 0) { |
265 | /*debug(("Resolving \"%s\" with gethostbyname() (IPv4 only)...\n", host)); */ |
2d466ffd |
266 | if ( (h = gethostbyname(host)) ) |
32874aea |
267 | ret->family = AF_INET; |
268 | } |
c4d8e107 |
269 | } |
270 | /*debug(("Done resolving...(family is %d) AF_INET = %d, AF_INET6 = %d\n", ret->family, AF_INET, AF_INET6)); */ |
271 | |
32874aea |
272 | if (ret->family == 0) { |
2f75bae1 |
273 | DWORD err = WSAGetLastError(); |
c4d8e107 |
274 | ret->error = (err == WSAENETDOWN ? "Network is down" : |
32874aea |
275 | err == |
276 | WSAHOST_NOT_FOUND ? "Host does not exist" : err |
277 | == WSATRY_AGAIN ? "Host not found" : |
c4d8e107 |
278 | #ifdef IPV6 |
279 | fGetAddrInfo ? "getaddrinfo: unknown error" : |
280 | #endif |
281 | "gethostbyname: unknown error"); |
282 | #ifdef DEBUG |
283 | { |
284 | LPVOID lpMsgBuf; |
32874aea |
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)); */ |
c4d8e107 |
291 | /* Free the buffer. */ |
292 | LocalFree(lpMsgBuf); |
293 | } |
294 | #endif |
32874aea |
295 | } else { |
c4d8e107 |
296 | ret->error = NULL; |
297 | |
298 | #ifdef IPV6 |
299 | /* If we got an address info use that... */ |
32874aea |
300 | if (ret->ai) { |
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); |
c4d8e107 |
305 | FGETNAMEINFO fGetNameInfo = NULL; |
306 | |
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) |
32874aea |
310 | memcpy(&a, |
311 | (char *) &((SOCKADDR_IN *) ret->ai-> |
312 | ai_addr)->sin_addr, sizeof(a)); |
c4d8e107 |
313 | |
314 | /* Now let's find that canonicalname... */ |
32874aea |
315 | if ((dllWSHIP6) |
316 | && (fGetNameInfo = |
317 | (FGETNAMEINFO) GetProcAddress(dllWSHIP6, |
318 | "getnameinfo"))) { |
319 | if (fGetNameInfo |
320 | ((struct sockaddr *) ret->ai->ai_addr, |
321 | ret->family == |
322 | AF_INET ? sizeof(SOCKADDR_IN) : |
6e1ebb76 |
323 | sizeof(SOCKADDR_IN6), realhost, |
324 | sizeof(realhost), NULL, 0, 0) != 0) { |
325 | strncpy(realhost, host, sizeof(realhost)); |
c4d8e107 |
326 | } |
327 | } |
328 | } |
329 | /* We used the IPv4-only gethostbyname()... */ |
330 | else |
c4d8e107 |
331 | #endif |
32874aea |
332 | { |
c4d8e107 |
333 | memcpy(&a, h->h_addr, sizeof(a)); |
334 | /* This way we are always sure the h->h_name is valid :) */ |
6e1ebb76 |
335 | strncpy(realhost, h->h_name, sizeof(realhost)); |
c4d8e107 |
336 | } |
c4d8e107 |
337 | } |
338 | #ifdef IPV6 |
339 | FreeLibrary(dllWSHIP6); |
340 | #endif |
32874aea |
341 | } else { |
87ed061f |
342 | /* |
343 | * This must be a numeric IPv4 address because it caused a |
344 | * success return from inet_addr. |
345 | */ |
32874aea |
346 | ret->family = AF_INET; |
6e1ebb76 |
347 | strncpy(realhost, host, sizeof(realhost)); |
2f75bae1 |
348 | } |
349 | ret->address = ntohl(a); |
6e1ebb76 |
350 | realhost[lenof(realhost)-1] = '\0'; |
351 | *canonicalname = smalloc(1+strlen(realhost)); |
352 | strcpy(*canonicalname, realhost); |
2f75bae1 |
353 | return ret; |
354 | } |
355 | |
3ad9d396 |
356 | void sk_getaddr(SockAddr addr, char *buf, int buflen) |
357 | { |
358 | #ifdef IPV6 |
359 | if (addr->family == AF_INET) { |
360 | #endif |
361 | struct in_addr a; |
362 | a.s_addr = htonl(addr->address); |
363 | strncpy(buf, inet_ntoa(a), buflen); |
364 | #ifdef IPV6 |
365 | } else { |
366 | FIXME; /* I don't know how to get a text form of an IPv6 address. */ |
367 | } |
368 | #endif |
369 | } |
370 | |
6971bbe7 |
371 | int sk_addrtype(SockAddr addr) |
372 | { |
373 | return addr->family; |
374 | } |
375 | |
376 | void sk_addrcopy(SockAddr addr, char *buf) |
377 | { |
378 | #ifdef IPV6 |
379 | if (addr->family == AF_INET) { |
380 | #endif |
381 | struct in_addr a; |
382 | a.s_addr = htonl(addr->address); |
96d9eb89 |
383 | memcpy(buf, (char*) &a.s_addr, 4); |
6971bbe7 |
384 | #ifdef IPV6 |
385 | } else { |
96d9eb89 |
386 | memcpy(buf, (char*) addr->ai, 16); |
6971bbe7 |
387 | } |
388 | #endif |
389 | } |
390 | |
32874aea |
391 | void sk_addr_free(SockAddr addr) |
392 | { |
2f75bae1 |
393 | sfree(addr); |
394 | } |
395 | |
32874aea |
396 | static Plug sk_tcp_plug(Socket sock, Plug p) |
397 | { |
7e78000d |
398 | Actual_Socket s = (Actual_Socket) sock; |
399 | Plug ret = s->plug; |
32874aea |
400 | if (p) |
401 | s->plug = p; |
7e78000d |
402 | return ret; |
403 | } |
404 | |
32874aea |
405 | static void sk_tcp_flush(Socket s) |
406 | { |
7e78000d |
407 | /* |
408 | * We send data to the socket as soon as we can anyway, |
409 | * so we don't need to do anything here. :-) |
410 | */ |
411 | } |
412 | |
2d466ffd |
413 | static void sk_tcp_close(Socket s); |
5471d09a |
414 | static int sk_tcp_write(Socket s, char *data, int len); |
415 | static int sk_tcp_write_oob(Socket s, char *data, int len); |
8eebd221 |
416 | static void sk_tcp_set_private_ptr(Socket s, void *ptr); |
417 | static void *sk_tcp_get_private_ptr(Socket s); |
418 | static void sk_tcp_set_frozen(Socket s, int is_frozen); |
2d466ffd |
419 | static char *sk_tcp_socket_error(Socket s); |
7e78000d |
420 | |
d74d141c |
421 | extern char *do_select(SOCKET skt, int startup); |
422 | |
423 | Socket sk_register(void *sock, Plug plug) |
424 | { |
425 | static struct socket_function_table fn_table = { |
426 | sk_tcp_plug, |
427 | sk_tcp_close, |
428 | sk_tcp_write, |
429 | sk_tcp_write_oob, |
430 | sk_tcp_flush, |
8eebd221 |
431 | sk_tcp_set_private_ptr, |
432 | sk_tcp_get_private_ptr, |
433 | sk_tcp_set_frozen, |
d74d141c |
434 | sk_tcp_socket_error |
435 | }; |
436 | |
437 | DWORD err; |
438 | char *errstr; |
439 | Actual_Socket ret; |
440 | |
441 | /* |
442 | * Create Socket structure. |
443 | */ |
444 | ret = smalloc(sizeof(struct Socket_tag)); |
445 | ret->fn = &fn_table; |
446 | ret->error = NULL; |
447 | ret->plug = plug; |
5471d09a |
448 | bufchain_init(&ret->output_data); |
d74d141c |
449 | ret->writable = 1; /* to start with */ |
450 | ret->sending_oob = 0; |
451 | ret->frozen = 1; |
5471d09a |
452 | ret->frozen_readable = 0; |
bc4802a1 |
453 | ret->localhost_only = 0; /* unused, but best init anyway */ |
7732d38a |
454 | ret->pending_error = 0; |
d74d141c |
455 | |
456 | ret->s = (SOCKET)sock; |
457 | |
458 | if (ret->s == INVALID_SOCKET) { |
459 | err = WSAGetLastError(); |
460 | ret->error = winsock_error_string(err); |
461 | return (Socket) ret; |
462 | } |
463 | |
464 | ret->oobinline = 0; |
465 | |
466 | /* Set up a select mechanism. This could be an AsyncSelect on a |
467 | * window, or an EventSelect on an event object. */ |
468 | errstr = do_select(ret->s, 1); |
469 | if (errstr) { |
470 | ret->error = errstr; |
471 | return (Socket) ret; |
472 | } |
473 | |
474 | add234(sktree, ret); |
475 | |
476 | return (Socket) ret; |
477 | } |
478 | |
4b1e8acc |
479 | Socket sk_new(SockAddr addr, int port, int privport, int oobinline, |
2184a5d9 |
480 | int nodelay, Plug plug) |
7e78000d |
481 | { |
482 | static struct socket_function_table fn_table = { |
483 | sk_tcp_plug, |
484 | sk_tcp_close, |
485 | sk_tcp_write, |
486 | sk_tcp_write_oob, |
487 | sk_tcp_flush, |
8eebd221 |
488 | sk_tcp_set_private_ptr, |
489 | sk_tcp_get_private_ptr, |
490 | sk_tcp_set_frozen, |
7e78000d |
491 | sk_tcp_socket_error |
492 | }; |
493 | |
2f75bae1 |
494 | SOCKET s; |
c4d8e107 |
495 | #ifdef IPV6 |
496 | SOCKADDR_IN6 a6; |
497 | #endif |
2f75bae1 |
498 | SOCKADDR_IN a; |
499 | DWORD err; |
500 | char *errstr; |
7e78000d |
501 | Actual_Socket ret; |
c91409da |
502 | short localport; |
2f75bae1 |
503 | |
504 | /* |
505 | * Create Socket structure. |
506 | */ |
507 | ret = smalloc(sizeof(struct Socket_tag)); |
7e78000d |
508 | ret->fn = &fn_table; |
2f75bae1 |
509 | ret->error = NULL; |
7e78000d |
510 | ret->plug = plug; |
5471d09a |
511 | bufchain_init(&ret->output_data); |
3ad9d396 |
512 | ret->connected = 0; /* to start with */ |
513 | ret->writable = 0; /* to start with */ |
33232c8f |
514 | ret->sending_oob = 0; |
d74d141c |
515 | ret->frozen = 0; |
5471d09a |
516 | ret->frozen_readable = 0; |
bc4802a1 |
517 | ret->localhost_only = 0; /* unused, but best init anyway */ |
7732d38a |
518 | ret->pending_error = 0; |
2f75bae1 |
519 | |
520 | /* |
521 | * Open socket. |
522 | */ |
c4d8e107 |
523 | s = socket(addr->family, SOCK_STREAM, 0); |
2f75bae1 |
524 | ret->s = s; |
525 | |
526 | if (s == INVALID_SOCKET) { |
527 | err = WSAGetLastError(); |
32874aea |
528 | ret->error = winsock_error_string(err); |
7e78000d |
529 | return (Socket) ret; |
2f75bae1 |
530 | } |
4b1e8acc |
531 | |
532 | ret->oobinline = oobinline; |
533 | if (oobinline) { |
1ad4eb6f |
534 | BOOL b = TRUE; |
32874aea |
535 | setsockopt(s, SOL_SOCKET, SO_OOBINLINE, (void *) &b, sizeof(b)); |
1ad4eb6f |
536 | } |
2f75bae1 |
537 | |
2184a5d9 |
538 | if (nodelay) { |
539 | BOOL b = TRUE; |
540 | setsockopt(s, IPPROTO_TCP, TCP_NODELAY, (void *) &b, sizeof(b)); |
541 | } |
542 | |
2f75bae1 |
543 | /* |
544 | * Bind to local address. |
545 | */ |
c91409da |
546 | if (privport) |
32874aea |
547 | localport = 1023; /* count from 1023 downwards */ |
c4d8e107 |
548 | else |
32874aea |
549 | localport = 0; /* just use port 0 (ie winsock picks) */ |
c91409da |
550 | |
551 | /* Loop round trying to bind */ |
552 | while (1) { |
32874aea |
553 | int retcode; |
c91409da |
554 | |
555 | #ifdef IPV6 |
32874aea |
556 | if (addr->family == AF_INET6) { |
557 | memset(&a6, 0, sizeof(a6)); |
558 | a6.sin6_family = AF_INET6; |
559 | /*a6.sin6_addr = in6addr_any; *//* == 0 */ |
560 | a6.sin6_port = htons(localport); |
561 | } else |
c4d8e107 |
562 | #endif |
32874aea |
563 | { |
564 | a.sin_family = AF_INET; |
565 | a.sin_addr.s_addr = htonl(INADDR_ANY); |
566 | a.sin_port = htons(localport); |
567 | } |
c4d8e107 |
568 | #ifdef IPV6 |
32874aea |
569 | retcode = bind(s, (addr->family == AF_INET6 ? |
570 | (struct sockaddr *) &a6 : |
571 | (struct sockaddr *) &a), |
572 | (addr->family == |
573 | AF_INET6 ? sizeof(a6) : sizeof(a))); |
c4d8e107 |
574 | #else |
32874aea |
575 | retcode = bind(s, (struct sockaddr *) &a, sizeof(a)); |
c4d8e107 |
576 | #endif |
32874aea |
577 | if (retcode != SOCKET_ERROR) { |
578 | err = 0; |
579 | break; /* done */ |
580 | } else { |
581 | err = WSAGetLastError(); |
582 | if (err != WSAEADDRINUSE) /* failed, for a bad reason */ |
583 | break; |
584 | } |
585 | |
586 | if (localport == 0) |
587 | break; /* we're only looping once */ |
588 | localport--; |
589 | if (localport == 0) |
590 | break; /* we might have got to the end */ |
c91409da |
591 | } |
592 | |
32874aea |
593 | if (err) { |
c4d8e107 |
594 | ret->error = winsock_error_string(err); |
7e78000d |
595 | return (Socket) ret; |
2f75bae1 |
596 | } |
597 | |
598 | /* |
599 | * Connect to remote address. |
600 | */ |
c4d8e107 |
601 | #ifdef IPV6 |
32874aea |
602 | if (addr->family == AF_INET6) { |
603 | memset(&a, 0, sizeof(a)); |
c4d8e107 |
604 | a6.sin6_family = AF_INET6; |
32874aea |
605 | a6.sin6_port = htons((short) port); |
606 | a6.sin6_addr = |
607 | ((struct sockaddr_in6 *) addr->ai->ai_addr)->sin6_addr; |
608 | } else |
c4d8e107 |
609 | #endif |
32874aea |
610 | { |
c4d8e107 |
611 | a.sin_family = AF_INET; |
612 | a.sin_addr.s_addr = htonl(addr->address); |
32874aea |
613 | a.sin_port = htons((short) port); |
c4d8e107 |
614 | } |
3ad9d396 |
615 | |
616 | /* Set up a select mechanism. This could be an AsyncSelect on a |
617 | * window, or an EventSelect on an event object. */ |
618 | errstr = do_select(s, 1); |
619 | if (errstr) { |
620 | ret->error = errstr; |
621 | return (Socket) ret; |
622 | } |
623 | |
32874aea |
624 | if (( |
625 | #ifdef IPV6 |
626 | connect(s, ((addr->family == AF_INET6) ? |
627 | (struct sockaddr *) &a6 : (struct sockaddr *) &a), |
628 | (addr->family == AF_INET6) ? sizeof(a6) : sizeof(a)) |
c4d8e107 |
629 | #else |
32874aea |
630 | connect(s, (struct sockaddr *) &a, sizeof(a)) |
c4d8e107 |
631 | #endif |
32874aea |
632 | ) == SOCKET_ERROR) { |
2f75bae1 |
633 | err = WSAGetLastError(); |
3ad9d396 |
634 | /* |
635 | * We expect a potential EWOULDBLOCK here, because the |
636 | * chances are the front end has done a select for |
637 | * FD_CONNECT, so that connect() will complete |
638 | * asynchronously. |
639 | */ |
640 | if ( err != WSAEWOULDBLOCK ) { |
641 | ret->error = winsock_error_string(err); |
642 | return (Socket) ret; |
643 | } |
644 | } else { |
645 | /* |
646 | * If we _don't_ get EWOULDBLOCK, the connect has completed |
647 | * and we should set the socket as writable. |
648 | */ |
649 | ret->writable = 1; |
2f75bae1 |
650 | } |
651 | |
652 | add234(sktree, ret); |
653 | |
7e78000d |
654 | return (Socket) ret; |
2f75bae1 |
655 | } |
656 | |
bcce45ed |
657 | Socket sk_newlistener(int port, Plug plug, int local_host_only) |
d74d141c |
658 | { |
659 | static struct socket_function_table fn_table = { |
660 | sk_tcp_plug, |
661 | sk_tcp_close, |
662 | sk_tcp_write, |
663 | sk_tcp_write_oob, |
664 | sk_tcp_flush, |
8eebd221 |
665 | sk_tcp_set_private_ptr, |
666 | sk_tcp_get_private_ptr, |
667 | sk_tcp_set_frozen, |
d74d141c |
668 | sk_tcp_socket_error |
669 | }; |
670 | |
671 | SOCKET s; |
672 | #ifdef IPV6 |
673 | SOCKADDR_IN6 a6; |
674 | #endif |
675 | SOCKADDR_IN a; |
676 | DWORD err; |
677 | char *errstr; |
678 | Actual_Socket ret; |
679 | int retcode; |
680 | int on = 1; |
681 | |
682 | /* |
683 | * Create Socket structure. |
684 | */ |
685 | ret = smalloc(sizeof(struct Socket_tag)); |
686 | ret->fn = &fn_table; |
687 | ret->error = NULL; |
688 | ret->plug = plug; |
5471d09a |
689 | bufchain_init(&ret->output_data); |
d74d141c |
690 | ret->writable = 0; /* to start with */ |
691 | ret->sending_oob = 0; |
692 | ret->frozen = 0; |
5471d09a |
693 | ret->frozen_readable = 0; |
bc4802a1 |
694 | ret->localhost_only = local_host_only; |
7732d38a |
695 | ret->pending_error = 0; |
d74d141c |
696 | |
697 | /* |
698 | * Open socket. |
699 | */ |
700 | s = socket(AF_INET, SOCK_STREAM, 0); |
701 | ret->s = s; |
702 | |
703 | if (s == INVALID_SOCKET) { |
704 | err = WSAGetLastError(); |
705 | ret->error = winsock_error_string(err); |
706 | return (Socket) ret; |
707 | } |
708 | |
709 | ret->oobinline = 0; |
710 | |
711 | |
712 | setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (const char *)&on, sizeof(on)); |
713 | |
714 | |
715 | #ifdef IPV6 |
716 | if (addr->family == AF_INET6) { |
717 | memset(&a6, 0, sizeof(a6)); |
718 | a6.sin6_family = AF_INET6; |
bcce45ed |
719 | if (local_host_only) |
720 | a6.sin6_addr = in6addr_loopback; |
721 | else |
722 | a6.sin6_addr = in6addr_any; |
d74d141c |
723 | a6.sin6_port = htons(port); |
724 | } else |
725 | #endif |
726 | { |
727 | a.sin_family = AF_INET; |
bcce45ed |
728 | if (local_host_only) |
729 | a.sin_addr.s_addr = htonl(INADDR_LOOPBACK); |
730 | else |
731 | a.sin_addr.s_addr = htonl(INADDR_ANY); |
d74d141c |
732 | a.sin_port = htons((short)port); |
733 | } |
734 | #ifdef IPV6 |
735 | retcode = bind(s, (addr->family == AF_INET6 ? |
736 | (struct sockaddr *) &a6 : |
737 | (struct sockaddr *) &a), |
738 | (addr->family == |
739 | AF_INET6 ? sizeof(a6) : sizeof(a))); |
740 | #else |
741 | retcode = bind(s, (struct sockaddr *) &a, sizeof(a)); |
742 | #endif |
743 | if (retcode != SOCKET_ERROR) { |
744 | err = 0; |
745 | } else { |
746 | err = WSAGetLastError(); |
747 | } |
748 | |
749 | if (err) { |
750 | ret->error = winsock_error_string(err); |
751 | return (Socket) ret; |
752 | } |
753 | |
754 | |
755 | if (listen(s, SOMAXCONN) == SOCKET_ERROR) { |
756 | closesocket(s); |
757 | ret->error = winsock_error_string(err); |
758 | return (Socket) ret; |
759 | } |
760 | |
761 | /* Set up a select mechanism. This could be an AsyncSelect on a |
762 | * window, or an EventSelect on an event object. */ |
763 | errstr = do_select(s, 1); |
764 | if (errstr) { |
765 | ret->error = errstr; |
766 | return (Socket) ret; |
767 | } |
768 | |
769 | add234(sktree, ret); |
770 | |
771 | return (Socket) ret; |
772 | } |
773 | |
32874aea |
774 | static void sk_tcp_close(Socket sock) |
775 | { |
9c964e85 |
776 | extern char *do_select(SOCKET skt, int startup); |
7e78000d |
777 | Actual_Socket s = (Actual_Socket) sock; |
9c964e85 |
778 | |
2f75bae1 |
779 | del234(sktree, s); |
780 | do_select(s->s, 0); |
781 | closesocket(s->s); |
dcbde236 |
782 | sfree(s); |
2f75bae1 |
783 | } |
784 | |
2f75bae1 |
785 | /* |
786 | * The function which tries to send on a socket once it's deemed |
787 | * writable. |
788 | */ |
32874aea |
789 | void try_send(Actual_Socket s) |
790 | { |
5471d09a |
791 | while (s->sending_oob || bufchain_size(&s->output_data) > 0) { |
2f75bae1 |
792 | int nsent; |
793 | DWORD err; |
5471d09a |
794 | void *data; |
32874aea |
795 | int len, urgentflag; |
796 | |
797 | if (s->sending_oob) { |
798 | urgentflag = MSG_OOB; |
799 | len = s->sending_oob; |
5471d09a |
800 | data = &s->oobdata; |
32874aea |
801 | } else { |
802 | urgentflag = 0; |
5471d09a |
803 | bufchain_prefix(&s->output_data, &data, &len); |
32874aea |
804 | } |
5471d09a |
805 | nsent = send(s->s, data, len, urgentflag); |
32874aea |
806 | noise_ultralight(nsent); |
2f75bae1 |
807 | if (nsent <= 0) { |
808 | err = (nsent < 0 ? WSAGetLastError() : 0); |
e5eb3a1c |
809 | if ((err < WSABASEERR && nsent < 0) || err == WSAEWOULDBLOCK) { |
d40a94b9 |
810 | /* |
811 | * Perfectly normal: we've sent all we can for the moment. |
812 | * |
e5eb3a1c |
813 | * (Some WinSock send() implementations can return |
814 | * <0 but leave no sensible error indication - |
815 | * WSAGetLastError() is called but returns zero or |
816 | * a small number - so we check that case and treat |
817 | * it just like WSAEWOULDBLOCK.) |
d40a94b9 |
818 | */ |
2f75bae1 |
819 | s->writable = FALSE; |
32874aea |
820 | return; |
2f75bae1 |
821 | } else if (nsent == 0 || |
32874aea |
822 | err == WSAECONNABORTED || err == WSAECONNRESET) { |
823 | /* |
7732d38a |
824 | * If send() returns CONNABORTED or CONNRESET, we |
825 | * unfortunately can't just call plug_closing(), |
826 | * because it's quite likely that we're currently |
827 | * _in_ a call from the code we'd be calling back |
828 | * to, so we'd have to make half the SSH code |
829 | * reentrant. Instead we flag a pending error on |
830 | * the socket, to be dealt with (by calling |
831 | * plug_closing()) at some suitable future moment. |
32874aea |
832 | */ |
7732d38a |
833 | s->pending_error = err; |
834 | return; |
2f75bae1 |
835 | } else { |
247308b5 |
836 | logevent(winsock_error_string(err)); |
837 | fatalbox("%s", winsock_error_string(err)); |
2f75bae1 |
838 | } |
839 | } else { |
5471d09a |
840 | if (s->sending_oob) { |
841 | if (nsent < len) { |
842 | memmove(s->oobdata, s->oobdata+nsent, len-nsent); |
843 | s->sending_oob = len - nsent; |
844 | } else { |
845 | s->sending_oob = 0; |
846 | } |
847 | } else { |
848 | bufchain_consume(&s->output_data, nsent); |
2f75bae1 |
849 | } |
850 | } |
851 | } |
852 | } |
853 | |
5471d09a |
854 | static int sk_tcp_write(Socket sock, char *buf, int len) |
32874aea |
855 | { |
7e78000d |
856 | Actual_Socket s = (Actual_Socket) sock; |
857 | |
2f75bae1 |
858 | /* |
859 | * Add the data to the buffer list on the socket. |
860 | */ |
5471d09a |
861 | bufchain_add(&s->output_data, buf, len); |
2f75bae1 |
862 | |
863 | /* |
864 | * Now try sending from the start of the buffer list. |
865 | */ |
866 | if (s->writable) |
867 | try_send(s); |
5471d09a |
868 | |
869 | return bufchain_size(&s->output_data); |
2f75bae1 |
870 | } |
871 | |
5471d09a |
872 | static int sk_tcp_write_oob(Socket sock, char *buf, int len) |
32874aea |
873 | { |
7e78000d |
874 | Actual_Socket s = (Actual_Socket) sock; |
875 | |
2f75bae1 |
876 | /* |
877 | * Replace the buffer list on the socket with the data. |
878 | */ |
5471d09a |
879 | bufchain_clear(&s->output_data); |
880 | assert(len <= sizeof(s->oobdata)); |
881 | memcpy(s->oobdata, buf, len); |
2f75bae1 |
882 | s->sending_oob = len; |
883 | |
884 | /* |
885 | * Now try sending from the start of the buffer list. |
886 | */ |
887 | if (s->writable) |
888 | try_send(s); |
5471d09a |
889 | |
890 | return s->sending_oob; |
2f75bae1 |
891 | } |
892 | |
32874aea |
893 | int select_result(WPARAM wParam, LPARAM lParam) |
894 | { |
f9d3f227 |
895 | int ret, open; |
2f75bae1 |
896 | DWORD err; |
b675c612 |
897 | char buf[20480]; /* nice big buffer for plenty of speed */ |
7e78000d |
898 | Actual_Socket s; |
49bad831 |
899 | u_long atmark; |
2f75bae1 |
900 | |
901 | /* wParam is the socket itself */ |
32874aea |
902 | s = find234(sktree, (void *) wParam, cmpforsearch); |
2f75bae1 |
903 | if (!s) |
904 | return 1; /* boggle */ |
905 | |
906 | if ((err = WSAGETSELECTERROR(lParam)) != 0) { |
32874aea |
907 | /* |
908 | * An error has occurred on this socket. Pass it to the |
909 | * plug. |
910 | */ |
911 | return plug_closing(s->plug, winsock_error_string(err), err, 0); |
2f75bae1 |
912 | } |
913 | |
7d6ee6ff |
914 | noise_ultralight(lParam); |
915 | |
2f75bae1 |
916 | switch (WSAGETSELECTEVENT(lParam)) { |
3ad9d396 |
917 | case FD_CONNECT: |
918 | s->connected = s->writable = 1; |
919 | break; |
2f75bae1 |
920 | case FD_READ: |
d74d141c |
921 | /* In the case the socket is still frozen, we don't even bother */ |
5471d09a |
922 | if (s->frozen) { |
923 | s->frozen_readable = 1; |
d74d141c |
924 | break; |
5471d09a |
925 | } |
d74d141c |
926 | |
32874aea |
927 | /* |
928 | * We have received data on the socket. For an oobinline |
929 | * socket, this might be data _before_ an urgent pointer, |
930 | * in which case we send it to the back end with type==1 |
931 | * (data prior to urgent). |
932 | */ |
933 | if (s->oobinline) { |
934 | atmark = 1; |
935 | ioctlsocket(s->s, SIOCATMARK, &atmark); |
936 | /* |
937 | * Avoid checking the return value from ioctlsocket(), |
938 | * on the grounds that some WinSock wrappers don't |
939 | * support it. If it does nothing, we get atmark==1, |
940 | * which is equivalent to `no OOB pending', so the |
941 | * effect will be to non-OOB-ify any OOB data. |
942 | */ |
943 | } else |
944 | atmark = 1; |
4b1e8acc |
945 | |
2f75bae1 |
946 | ret = recv(s->s, buf, sizeof(buf), 0); |
32874aea |
947 | noise_ultralight(ret); |
2f75bae1 |
948 | if (ret < 0) { |
949 | err = WSAGetLastError(); |
950 | if (err == WSAEWOULDBLOCK) { |
951 | break; |
952 | } |
953 | } |
954 | if (ret < 0) { |
32874aea |
955 | return plug_closing(s->plug, winsock_error_string(err), err, |
956 | 0); |
7e78000d |
957 | } else if (0 == ret) { |
32874aea |
958 | return plug_closing(s->plug, NULL, 0, 0); |
2f75bae1 |
959 | } else { |
32874aea |
960 | return plug_receive(s->plug, atmark ? 0 : 1, buf, ret); |
2f75bae1 |
961 | } |
962 | break; |
963 | case FD_OOB: |
32874aea |
964 | /* |
965 | * This will only happen on a non-oobinline socket. It |
966 | * indicates that we can immediately perform an OOB read |
967 | * and get back OOB data, which we will send to the back |
968 | * end with type==2 (urgent data). |
969 | */ |
970 | ret = recv(s->s, buf, sizeof(buf), MSG_OOB); |
971 | noise_ultralight(ret); |
972 | if (ret <= 0) { |
247308b5 |
973 | char *str = (ret == 0 ? "Internal networking trouble" : |
974 | winsock_error_string(WSAGetLastError())); |
975 | logevent(str); |
976 | fatalbox("%s", str); |
32874aea |
977 | } else { |
978 | return plug_receive(s->plug, 2, buf, ret); |
979 | } |
980 | break; |
2f75bae1 |
981 | case FD_WRITE: |
5471d09a |
982 | { |
983 | int bufsize_before, bufsize_after; |
984 | s->writable = 1; |
985 | bufsize_before = s->sending_oob + bufchain_size(&s->output_data); |
986 | try_send(s); |
987 | bufsize_after = s->sending_oob + bufchain_size(&s->output_data); |
988 | if (bufsize_after < bufsize_before) |
989 | plug_sent(s->plug, bufsize_after); |
990 | } |
2f75bae1 |
991 | break; |
992 | case FD_CLOSE: |
f9d3f227 |
993 | /* Signal a close on the socket. First read any outstanding data. */ |
32874aea |
994 | open = 1; |
995 | do { |
996 | ret = recv(s->s, buf, sizeof(buf), 0); |
997 | if (ret < 0) { |
998 | err = WSAGetLastError(); |
999 | if (err == WSAEWOULDBLOCK) |
1000 | break; |
1001 | return plug_closing(s->plug, winsock_error_string(err), |
1002 | err, 0); |
1003 | } else { |
1004 | if (ret) |
1005 | open &= plug_receive(s->plug, 0, buf, ret); |
1006 | else |
1007 | open &= plug_closing(s->plug, NULL, 0, 0); |
7e78000d |
1008 | } |
f9d3f227 |
1009 | } while (ret > 0); |
32874aea |
1010 | return open; |
d74d141c |
1011 | case FD_ACCEPT: |
1012 | { |
bc4802a1 |
1013 | struct sockaddr_in isa; |
1014 | int addrlen = sizeof(struct sockaddr_in); |
bcce45ed |
1015 | SOCKET t; /* socket of connection */ |
1016 | |
bc4802a1 |
1017 | memset(&isa, 0, sizeof(struct sockaddr_in)); |
bcce45ed |
1018 | err = 0; |
0e5e7f46 |
1019 | t = accept(s->s,(struct sockaddr *)&isa,&addrlen); |
bcce45ed |
1020 | if (t == INVALID_SOCKET) |
1021 | { |
1022 | err = WSAGetLastError(); |
1023 | if (err == WSATRY_AGAIN) |
1024 | break; |
1025 | } |
1026 | |
bc4802a1 |
1027 | if (s->localhost_only && |
1028 | ntohl(isa.sin_addr.s_addr) != INADDR_LOOPBACK) { |
1029 | closesocket(t); /* dodgy WinSock let nonlocal through */ |
1030 | } else if (plug_accepting(s->plug, (void*)t)) { |
bcce45ed |
1031 | closesocket(t); /* denied or error */ |
1032 | } |
d74d141c |
1033 | } |
2f75bae1 |
1034 | } |
1035 | |
1036 | return 1; |
1037 | } |
1038 | |
1039 | /* |
7732d38a |
1040 | * Deal with socket errors detected in try_send(). |
1041 | */ |
1042 | void net_pending_errors(void) |
1043 | { |
1044 | int i; |
1045 | Actual_Socket s; |
1046 | |
1047 | /* |
1048 | * This might be a fiddly business, because it's just possible |
1049 | * that handling a pending error on one socket might cause |
1050 | * others to be closed. (I can't think of any reason this might |
1051 | * happen in current SSH implementation, but to maintain |
1052 | * generality of this network layer I'll assume the worst.) |
1053 | * |
1054 | * So what we'll do is search the socket list for _one_ socket |
1055 | * with a pending error, and then handle it, and then search |
1056 | * the list again _from the beginning_. Repeat until we make a |
1057 | * pass with no socket errors present. That way we are |
1058 | * protected against the socket list changing under our feet. |
1059 | */ |
1060 | |
1061 | do { |
1062 | for (i = 0; (s = index234(sktree, i)) != NULL; i++) { |
1063 | if (s->pending_error) { |
1064 | /* |
1065 | * An error has occurred on this socket. Pass it to the |
1066 | * plug. |
1067 | */ |
1068 | plug_closing(s->plug, |
1069 | winsock_error_string(s->pending_error), |
1070 | s->pending_error, 0); |
1071 | break; |
1072 | } |
1073 | } |
1074 | } while (s); |
1075 | } |
1076 | |
1077 | /* |
2f75bae1 |
1078 | * Each socket abstraction contains a `void *' private field in |
1079 | * which the client can keep state. |
1080 | */ |
8eebd221 |
1081 | static void sk_tcp_set_private_ptr(Socket sock, void *ptr) |
32874aea |
1082 | { |
7e78000d |
1083 | Actual_Socket s = (Actual_Socket) sock; |
2f75bae1 |
1084 | s->private_ptr = ptr; |
1085 | } |
32874aea |
1086 | |
8eebd221 |
1087 | static void *sk_tcp_get_private_ptr(Socket sock) |
32874aea |
1088 | { |
7e78000d |
1089 | Actual_Socket s = (Actual_Socket) sock; |
2f75bae1 |
1090 | return s->private_ptr; |
1091 | } |
1092 | |
1093 | /* |
1094 | * Special error values are returned from sk_namelookup and sk_new |
1095 | * if there's a problem. These functions extract an error message, |
1096 | * or return NULL if there's no problem. |
1097 | */ |
32874aea |
1098 | char *sk_addr_error(SockAddr addr) |
1099 | { |
2f75bae1 |
1100 | return addr->error; |
1101 | } |
32874aea |
1102 | static char *sk_tcp_socket_error(Socket sock) |
1103 | { |
7e78000d |
1104 | Actual_Socket s = (Actual_Socket) sock; |
2f75bae1 |
1105 | return s->error; |
1106 | } |
1107 | |
8eebd221 |
1108 | static void sk_tcp_set_frozen(Socket sock, int is_frozen) |
d74d141c |
1109 | { |
1110 | Actual_Socket s = (Actual_Socket) sock; |
5471d09a |
1111 | if (s->frozen == is_frozen) |
1112 | return; |
d74d141c |
1113 | s->frozen = is_frozen; |
5471d09a |
1114 | if (!is_frozen && s->frozen_readable) { |
d74d141c |
1115 | char c; |
1116 | recv(s->s, &c, 1, MSG_PEEK); |
1117 | } |
5471d09a |
1118 | s->frozen_readable = 0; |
d74d141c |
1119 | } |
1120 | |
2f75bae1 |
1121 | /* |
1122 | * For Plink: enumerate all sockets currently active. |
1123 | */ |
32874aea |
1124 | SOCKET first_socket(int *state) |
1125 | { |
d2371c81 |
1126 | Actual_Socket s; |
1127 | *state = 0; |
1128 | s = index234(sktree, (*state)++); |
2f75bae1 |
1129 | return s ? s->s : INVALID_SOCKET; |
1130 | } |
32874aea |
1131 | |
1132 | SOCKET next_socket(int *state) |
1133 | { |
d2371c81 |
1134 | Actual_Socket s = index234(sktree, (*state)++); |
2f75bae1 |
1135 | return s ? s->s : INVALID_SOCKET; |
1136 | } |