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 | |
6ee9b735 |
58 | #define ipv4_is_loopback(addr) \ |
59 | ((ntohl(addr.s_addr) & 0xFF000000L) == 0x7F000000L) |
60 | |
2f75bae1 |
61 | struct Socket_tag { |
7e78000d |
62 | struct socket_function_table *fn; |
63 | /* the above variable absolutely *must* be the first in this structure */ |
2f75bae1 |
64 | char *error; |
65 | SOCKET s; |
7e78000d |
66 | Plug plug; |
2f75bae1 |
67 | void *private_ptr; |
5471d09a |
68 | bufchain output_data; |
3ad9d396 |
69 | int connected; |
2f75bae1 |
70 | int writable; |
5471d09a |
71 | int frozen; /* this causes readability notifications to be ignored */ |
72 | int frozen_readable; /* this means we missed at least one readability |
73 | * notification while we were frozen */ |
bc4802a1 |
74 | int localhost_only; /* for listening sockets */ |
5471d09a |
75 | char oobdata[1]; |
1ad4eb6f |
76 | int sending_oob; |
4b1e8acc |
77 | int oobinline; |
7732d38a |
78 | int pending_error; /* in case send() returns error */ |
2f75bae1 |
79 | }; |
80 | |
7e78000d |
81 | /* |
82 | * We used to typedef struct Socket_tag *Socket. |
83 | * |
84 | * Since we have made the networking abstraction slightly more |
85 | * abstract, Socket no longer means a tcp socket (it could mean |
86 | * an ssl socket). So now we must use Actual_Socket when we know |
87 | * we are talking about a tcp socket. |
88 | */ |
89 | typedef struct Socket_tag *Actual_Socket; |
90 | |
2f75bae1 |
91 | struct SockAddr_tag { |
92 | char *error; |
c4d8e107 |
93 | /* address family this belongs to, AF_INET for IPv4, AF_INET6 for IPv6. */ |
32874aea |
94 | int family; |
c4d8e107 |
95 | unsigned long address; /* Address IPv4 style. */ |
96 | #ifdef IPV6 |
97 | struct addrinfo *ai; /* Address IPv6 style. */ |
98 | #endif |
2f75bae1 |
99 | }; |
100 | |
2f75bae1 |
101 | static tree234 *sktree; |
102 | |
32874aea |
103 | static int cmpfortree(void *av, void *bv) |
104 | { |
105 | Actual_Socket a = (Actual_Socket) av, b = (Actual_Socket) bv; |
106 | unsigned long as = (unsigned long) a->s, bs = (unsigned long) b->s; |
107 | if (as < bs) |
108 | return -1; |
109 | if (as > bs) |
110 | return +1; |
2f75bae1 |
111 | return 0; |
112 | } |
113 | |
32874aea |
114 | static int cmpforsearch(void *av, void *bv) |
115 | { |
116 | Actual_Socket b = (Actual_Socket) bv; |
117 | unsigned long as = (unsigned long) av, bs = (unsigned long) b->s; |
118 | if (as < bs) |
119 | return -1; |
120 | if (as > bs) |
121 | return +1; |
2f75bae1 |
122 | return 0; |
123 | } |
124 | |
32874aea |
125 | void sk_init(void) |
126 | { |
2f75bae1 |
127 | sktree = newtree234(cmpfortree); |
128 | } |
129 | |
93b581bd |
130 | void sk_cleanup(void) |
131 | { |
132 | Actual_Socket s; |
133 | int i; |
134 | |
135 | if (sktree) { |
136 | for (i = 0; (s = index234(sktree, i)) != NULL; i++) { |
137 | closesocket(s->s); |
138 | } |
139 | } |
140 | } |
141 | |
32874aea |
142 | char *winsock_error_string(int error) |
143 | { |
e74fbad9 |
144 | switch (error) { |
32874aea |
145 | case WSAEACCES: |
146 | return "Network error: Permission denied"; |
147 | case WSAEADDRINUSE: |
148 | return "Network error: Address already in use"; |
149 | case WSAEADDRNOTAVAIL: |
150 | return "Network error: Cannot assign requested address"; |
151 | case WSAEAFNOSUPPORT: |
152 | return |
153 | "Network error: Address family not supported by protocol family"; |
154 | case WSAEALREADY: |
155 | return "Network error: Operation already in progress"; |
156 | case WSAECONNABORTED: |
157 | return "Network error: Software caused connection abort"; |
158 | case WSAECONNREFUSED: |
159 | return "Network error: Connection refused"; |
160 | case WSAECONNRESET: |
161 | return "Network error: Connection reset by peer"; |
162 | case WSAEDESTADDRREQ: |
163 | return "Network error: Destination address required"; |
164 | case WSAEFAULT: |
165 | return "Network error: Bad address"; |
166 | case WSAEHOSTDOWN: |
167 | return "Network error: Host is down"; |
168 | case WSAEHOSTUNREACH: |
169 | return "Network error: No route to host"; |
170 | case WSAEINPROGRESS: |
171 | return "Network error: Operation now in progress"; |
172 | case WSAEINTR: |
173 | return "Network error: Interrupted function call"; |
174 | case WSAEINVAL: |
175 | return "Network error: Invalid argument"; |
176 | case WSAEISCONN: |
177 | return "Network error: Socket is already connected"; |
178 | case WSAEMFILE: |
179 | return "Network error: Too many open files"; |
180 | case WSAEMSGSIZE: |
181 | return "Network error: Message too long"; |
182 | case WSAENETDOWN: |
183 | return "Network error: Network is down"; |
184 | case WSAENETRESET: |
185 | return "Network error: Network dropped connection on reset"; |
186 | case WSAENETUNREACH: |
187 | return "Network error: Network is unreachable"; |
188 | case WSAENOBUFS: |
189 | return "Network error: No buffer space available"; |
190 | case WSAENOPROTOOPT: |
191 | return "Network error: Bad protocol option"; |
192 | case WSAENOTCONN: |
193 | return "Network error: Socket is not connected"; |
194 | case WSAENOTSOCK: |
195 | return "Network error: Socket operation on non-socket"; |
196 | case WSAEOPNOTSUPP: |
197 | return "Network error: Operation not supported"; |
198 | case WSAEPFNOSUPPORT: |
199 | return "Network error: Protocol family not supported"; |
200 | case WSAEPROCLIM: |
201 | return "Network error: Too many processes"; |
202 | case WSAEPROTONOSUPPORT: |
203 | return "Network error: Protocol not supported"; |
204 | case WSAEPROTOTYPE: |
205 | return "Network error: Protocol wrong type for socket"; |
206 | case WSAESHUTDOWN: |
207 | return "Network error: Cannot send after socket shutdown"; |
208 | case WSAESOCKTNOSUPPORT: |
209 | return "Network error: Socket type not supported"; |
210 | case WSAETIMEDOUT: |
211 | return "Network error: Connection timed out"; |
212 | case WSAEWOULDBLOCK: |
213 | return "Network error: Resource temporarily unavailable"; |
214 | case WSAEDISCON: |
215 | return "Network error: Graceful shutdown in progress"; |
216 | default: |
217 | return "Unknown network error"; |
e74fbad9 |
218 | } |
219 | } |
220 | |
c4d8e107 |
221 | SockAddr sk_namelookup(char *host, char **canonicalname) |
222 | { |
2f75bae1 |
223 | SockAddr ret = smalloc(sizeof(struct SockAddr_tag)); |
224 | unsigned long a; |
c4d8e107 |
225 | struct hostent *h = NULL; |
6e1ebb76 |
226 | char realhost[8192]; |
2f75bae1 |
227 | |
c4d8e107 |
228 | /* Clear the structure and default to IPv4. */ |
229 | memset(ret, 0, sizeof(struct SockAddr_tag)); |
230 | ret->family = 0; /* We set this one when we have resolved the host. */ |
6e1ebb76 |
231 | *realhost = '\0'; |
c4d8e107 |
232 | |
32874aea |
233 | if ((a = inet_addr(host)) == (unsigned long) INADDR_NONE) { |
c4d8e107 |
234 | #ifdef IPV6 |
235 | |
236 | /* Try to get the getaddrinfo() function from wship6.dll */ |
237 | /* This way one doesn't need to have IPv6 dll's to use PuTTY and |
238 | * it will fallback to IPv4. */ |
32874aea |
239 | typedef int (CALLBACK * FGETADDRINFO) (const char *nodename, |
240 | const char *servname, |
241 | const struct addrinfo * |
242 | hints, |
243 | struct addrinfo ** res); |
c4d8e107 |
244 | FGETADDRINFO fGetAddrInfo = NULL; |
245 | |
246 | HINSTANCE dllWSHIP6 = LoadLibrary("wship6.dll"); |
247 | if (dllWSHIP6) |
32874aea |
248 | fGetAddrInfo = (FGETADDRINFO) GetProcAddress(dllWSHIP6, |
249 | "getaddrinfo"); |
c4d8e107 |
250 | |
251 | /* |
252 | * Use fGetAddrInfo when it's available (which usually also |
253 | * means IPv6 is installed...) |
254 | */ |
32874aea |
255 | if (fGetAddrInfo) { |
c4d8e107 |
256 | /*debug(("Resolving \"%s\" with getaddrinfo() (IPv4+IPv6 capable)...\n", host)); */ |
257 | if (fGetAddrInfo(host, NULL, NULL, &ret->ai) == 0) |
258 | ret->family = ret->ai->ai_family; |
32874aea |
259 | } else |
c4d8e107 |
260 | #endif |
32874aea |
261 | { |
c4d8e107 |
262 | /* |
263 | * Otherwise use the IPv4-only gethostbyname... |
264 | * (NOTE: we don't use gethostbyname as a |
265 | * fallback!) |
266 | */ |
32874aea |
267 | if (ret->family == 0) { |
268 | /*debug(("Resolving \"%s\" with gethostbyname() (IPv4 only)...\n", host)); */ |
2d466ffd |
269 | if ( (h = gethostbyname(host)) ) |
32874aea |
270 | ret->family = AF_INET; |
271 | } |
c4d8e107 |
272 | } |
273 | /*debug(("Done resolving...(family is %d) AF_INET = %d, AF_INET6 = %d\n", ret->family, AF_INET, AF_INET6)); */ |
274 | |
32874aea |
275 | if (ret->family == 0) { |
2f75bae1 |
276 | DWORD err = WSAGetLastError(); |
c4d8e107 |
277 | ret->error = (err == WSAENETDOWN ? "Network is down" : |
32874aea |
278 | err == |
279 | WSAHOST_NOT_FOUND ? "Host does not exist" : err |
280 | == WSATRY_AGAIN ? "Host not found" : |
c4d8e107 |
281 | #ifdef IPV6 |
282 | fGetAddrInfo ? "getaddrinfo: unknown error" : |
283 | #endif |
284 | "gethostbyname: unknown error"); |
285 | #ifdef DEBUG |
286 | { |
287 | LPVOID lpMsgBuf; |
32874aea |
288 | FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | |
289 | FORMAT_MESSAGE_FROM_SYSTEM | |
290 | FORMAT_MESSAGE_IGNORE_INSERTS, NULL, err, |
291 | MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), |
292 | (LPTSTR) & lpMsgBuf, 0, NULL); |
293 | /*debug(("Error %ld: %s (h=%lx)\n", err, lpMsgBuf, h)); */ |
c4d8e107 |
294 | /* Free the buffer. */ |
295 | LocalFree(lpMsgBuf); |
296 | } |
297 | #endif |
32874aea |
298 | } else { |
c4d8e107 |
299 | ret->error = NULL; |
300 | |
301 | #ifdef IPV6 |
302 | /* If we got an address info use that... */ |
32874aea |
303 | if (ret->ai) { |
304 | typedef int (CALLBACK * FGETNAMEINFO) |
305 | (const struct sockaddr FAR * sa, socklen_t salen, |
306 | char FAR * host, size_t hostlen, char FAR * serv, |
307 | size_t servlen, int flags); |
c4d8e107 |
308 | FGETNAMEINFO fGetNameInfo = NULL; |
309 | |
310 | /* Are we in IPv4 fallback mode? */ |
311 | /* We put the IPv4 address into the a variable so we can further-on use the IPv4 code... */ |
312 | if (ret->family == AF_INET) |
32874aea |
313 | memcpy(&a, |
314 | (char *) &((SOCKADDR_IN *) ret->ai-> |
315 | ai_addr)->sin_addr, sizeof(a)); |
c4d8e107 |
316 | |
317 | /* Now let's find that canonicalname... */ |
32874aea |
318 | if ((dllWSHIP6) |
319 | && (fGetNameInfo = |
320 | (FGETNAMEINFO) GetProcAddress(dllWSHIP6, |
321 | "getnameinfo"))) { |
322 | if (fGetNameInfo |
323 | ((struct sockaddr *) ret->ai->ai_addr, |
324 | ret->family == |
325 | AF_INET ? sizeof(SOCKADDR_IN) : |
6e1ebb76 |
326 | sizeof(SOCKADDR_IN6), realhost, |
327 | sizeof(realhost), NULL, 0, 0) != 0) { |
328 | strncpy(realhost, host, sizeof(realhost)); |
c4d8e107 |
329 | } |
330 | } |
331 | } |
332 | /* We used the IPv4-only gethostbyname()... */ |
333 | else |
c4d8e107 |
334 | #endif |
32874aea |
335 | { |
c4d8e107 |
336 | memcpy(&a, h->h_addr, sizeof(a)); |
337 | /* This way we are always sure the h->h_name is valid :) */ |
6e1ebb76 |
338 | strncpy(realhost, h->h_name, sizeof(realhost)); |
c4d8e107 |
339 | } |
c4d8e107 |
340 | } |
341 | #ifdef IPV6 |
342 | FreeLibrary(dllWSHIP6); |
343 | #endif |
32874aea |
344 | } else { |
87ed061f |
345 | /* |
346 | * This must be a numeric IPv4 address because it caused a |
347 | * success return from inet_addr. |
348 | */ |
32874aea |
349 | ret->family = AF_INET; |
6e1ebb76 |
350 | strncpy(realhost, host, sizeof(realhost)); |
2f75bae1 |
351 | } |
352 | ret->address = ntohl(a); |
6e1ebb76 |
353 | realhost[lenof(realhost)-1] = '\0'; |
354 | *canonicalname = smalloc(1+strlen(realhost)); |
355 | strcpy(*canonicalname, realhost); |
2f75bae1 |
356 | return ret; |
357 | } |
358 | |
3ad9d396 |
359 | void sk_getaddr(SockAddr addr, char *buf, int buflen) |
360 | { |
361 | #ifdef IPV6 |
362 | if (addr->family == AF_INET) { |
363 | #endif |
364 | struct in_addr a; |
365 | a.s_addr = htonl(addr->address); |
366 | strncpy(buf, inet_ntoa(a), buflen); |
367 | #ifdef IPV6 |
368 | } else { |
369 | FIXME; /* I don't know how to get a text form of an IPv6 address. */ |
370 | } |
371 | #endif |
372 | } |
373 | |
b804e1e5 |
374 | int sk_hostname_is_local(char *name) |
375 | { |
376 | return !strcmp(name, "localhost"); |
377 | } |
378 | |
379 | int sk_address_is_local(SockAddr addr) |
380 | { |
381 | #ifdef IPV6 |
382 | if (addr->family == AF_INET) { |
383 | #endif |
384 | struct in_addr a; |
385 | a.s_addr = htonl(addr->address); |
386 | return ipv4_is_loopback(a); |
387 | #ifdef IPV6 |
388 | } else { |
389 | FIXME; /* someone who can compile for IPV6 had better do this bit */ |
390 | } |
391 | #endif |
392 | } |
393 | |
6971bbe7 |
394 | int sk_addrtype(SockAddr addr) |
395 | { |
68a49acb |
396 | return (addr->family == AF_INET ? ADDRTYPE_IPV4 : ADDRTYPE_IPV6); |
6971bbe7 |
397 | } |
398 | |
399 | void sk_addrcopy(SockAddr addr, char *buf) |
400 | { |
401 | #ifdef IPV6 |
402 | if (addr->family == AF_INET) { |
403 | #endif |
404 | struct in_addr a; |
405 | a.s_addr = htonl(addr->address); |
96d9eb89 |
406 | memcpy(buf, (char*) &a.s_addr, 4); |
6971bbe7 |
407 | #ifdef IPV6 |
408 | } else { |
96d9eb89 |
409 | memcpy(buf, (char*) addr->ai, 16); |
6971bbe7 |
410 | } |
411 | #endif |
412 | } |
413 | |
32874aea |
414 | void sk_addr_free(SockAddr addr) |
415 | { |
2f75bae1 |
416 | sfree(addr); |
417 | } |
418 | |
32874aea |
419 | static Plug sk_tcp_plug(Socket sock, Plug p) |
420 | { |
7e78000d |
421 | Actual_Socket s = (Actual_Socket) sock; |
422 | Plug ret = s->plug; |
32874aea |
423 | if (p) |
424 | s->plug = p; |
7e78000d |
425 | return ret; |
426 | } |
427 | |
32874aea |
428 | static void sk_tcp_flush(Socket s) |
429 | { |
7e78000d |
430 | /* |
431 | * We send data to the socket as soon as we can anyway, |
432 | * so we don't need to do anything here. :-) |
433 | */ |
434 | } |
435 | |
2d466ffd |
436 | static void sk_tcp_close(Socket s); |
5471d09a |
437 | static int sk_tcp_write(Socket s, char *data, int len); |
438 | static int sk_tcp_write_oob(Socket s, char *data, int len); |
8eebd221 |
439 | static void sk_tcp_set_private_ptr(Socket s, void *ptr); |
440 | static void *sk_tcp_get_private_ptr(Socket s); |
441 | static void sk_tcp_set_frozen(Socket s, int is_frozen); |
2d466ffd |
442 | static char *sk_tcp_socket_error(Socket s); |
7e78000d |
443 | |
d74d141c |
444 | extern char *do_select(SOCKET skt, int startup); |
445 | |
446 | Socket sk_register(void *sock, Plug plug) |
447 | { |
448 | static struct socket_function_table fn_table = { |
449 | sk_tcp_plug, |
450 | sk_tcp_close, |
451 | sk_tcp_write, |
452 | sk_tcp_write_oob, |
453 | sk_tcp_flush, |
8eebd221 |
454 | sk_tcp_set_private_ptr, |
455 | sk_tcp_get_private_ptr, |
456 | sk_tcp_set_frozen, |
d74d141c |
457 | sk_tcp_socket_error |
458 | }; |
459 | |
460 | DWORD err; |
461 | char *errstr; |
462 | Actual_Socket ret; |
463 | |
464 | /* |
465 | * Create Socket structure. |
466 | */ |
467 | ret = smalloc(sizeof(struct Socket_tag)); |
468 | ret->fn = &fn_table; |
469 | ret->error = NULL; |
470 | ret->plug = plug; |
5471d09a |
471 | bufchain_init(&ret->output_data); |
d74d141c |
472 | ret->writable = 1; /* to start with */ |
473 | ret->sending_oob = 0; |
474 | ret->frozen = 1; |
5471d09a |
475 | ret->frozen_readable = 0; |
bc4802a1 |
476 | ret->localhost_only = 0; /* unused, but best init anyway */ |
7732d38a |
477 | ret->pending_error = 0; |
d74d141c |
478 | |
479 | ret->s = (SOCKET)sock; |
480 | |
481 | if (ret->s == INVALID_SOCKET) { |
482 | err = WSAGetLastError(); |
483 | ret->error = winsock_error_string(err); |
484 | return (Socket) ret; |
485 | } |
486 | |
487 | ret->oobinline = 0; |
488 | |
489 | /* Set up a select mechanism. This could be an AsyncSelect on a |
490 | * window, or an EventSelect on an event object. */ |
491 | errstr = do_select(ret->s, 1); |
492 | if (errstr) { |
493 | ret->error = errstr; |
494 | return (Socket) ret; |
495 | } |
496 | |
497 | add234(sktree, ret); |
498 | |
499 | return (Socket) ret; |
500 | } |
501 | |
4b1e8acc |
502 | Socket sk_new(SockAddr addr, int port, int privport, int oobinline, |
2184a5d9 |
503 | int nodelay, Plug plug) |
7e78000d |
504 | { |
505 | static struct socket_function_table fn_table = { |
506 | sk_tcp_plug, |
507 | sk_tcp_close, |
508 | sk_tcp_write, |
509 | sk_tcp_write_oob, |
510 | sk_tcp_flush, |
8eebd221 |
511 | sk_tcp_set_private_ptr, |
512 | sk_tcp_get_private_ptr, |
513 | sk_tcp_set_frozen, |
7e78000d |
514 | sk_tcp_socket_error |
515 | }; |
516 | |
2f75bae1 |
517 | SOCKET s; |
c4d8e107 |
518 | #ifdef IPV6 |
519 | SOCKADDR_IN6 a6; |
520 | #endif |
2f75bae1 |
521 | SOCKADDR_IN a; |
522 | DWORD err; |
523 | char *errstr; |
7e78000d |
524 | Actual_Socket ret; |
c91409da |
525 | short localport; |
2f75bae1 |
526 | |
527 | /* |
528 | * Create Socket structure. |
529 | */ |
530 | ret = smalloc(sizeof(struct Socket_tag)); |
7e78000d |
531 | ret->fn = &fn_table; |
2f75bae1 |
532 | ret->error = NULL; |
7e78000d |
533 | ret->plug = plug; |
5471d09a |
534 | bufchain_init(&ret->output_data); |
3ad9d396 |
535 | ret->connected = 0; /* to start with */ |
536 | ret->writable = 0; /* to start with */ |
33232c8f |
537 | ret->sending_oob = 0; |
d74d141c |
538 | ret->frozen = 0; |
5471d09a |
539 | ret->frozen_readable = 0; |
bc4802a1 |
540 | ret->localhost_only = 0; /* unused, but best init anyway */ |
7732d38a |
541 | ret->pending_error = 0; |
2f75bae1 |
542 | |
543 | /* |
544 | * Open socket. |
545 | */ |
c4d8e107 |
546 | s = socket(addr->family, SOCK_STREAM, 0); |
2f75bae1 |
547 | ret->s = s; |
548 | |
549 | if (s == INVALID_SOCKET) { |
550 | err = WSAGetLastError(); |
32874aea |
551 | ret->error = winsock_error_string(err); |
7e78000d |
552 | return (Socket) ret; |
2f75bae1 |
553 | } |
4b1e8acc |
554 | |
555 | ret->oobinline = oobinline; |
556 | if (oobinline) { |
1ad4eb6f |
557 | BOOL b = TRUE; |
32874aea |
558 | setsockopt(s, SOL_SOCKET, SO_OOBINLINE, (void *) &b, sizeof(b)); |
1ad4eb6f |
559 | } |
2f75bae1 |
560 | |
2184a5d9 |
561 | if (nodelay) { |
562 | BOOL b = TRUE; |
563 | setsockopt(s, IPPROTO_TCP, TCP_NODELAY, (void *) &b, sizeof(b)); |
564 | } |
565 | |
2f75bae1 |
566 | /* |
567 | * Bind to local address. |
568 | */ |
c91409da |
569 | if (privport) |
32874aea |
570 | localport = 1023; /* count from 1023 downwards */ |
c4d8e107 |
571 | else |
32874aea |
572 | localport = 0; /* just use port 0 (ie winsock picks) */ |
c91409da |
573 | |
574 | /* Loop round trying to bind */ |
575 | while (1) { |
32874aea |
576 | int retcode; |
c91409da |
577 | |
578 | #ifdef IPV6 |
32874aea |
579 | if (addr->family == AF_INET6) { |
580 | memset(&a6, 0, sizeof(a6)); |
581 | a6.sin6_family = AF_INET6; |
582 | /*a6.sin6_addr = in6addr_any; *//* == 0 */ |
583 | a6.sin6_port = htons(localport); |
584 | } else |
c4d8e107 |
585 | #endif |
32874aea |
586 | { |
587 | a.sin_family = AF_INET; |
588 | a.sin_addr.s_addr = htonl(INADDR_ANY); |
589 | a.sin_port = htons(localport); |
590 | } |
c4d8e107 |
591 | #ifdef IPV6 |
32874aea |
592 | retcode = bind(s, (addr->family == AF_INET6 ? |
593 | (struct sockaddr *) &a6 : |
594 | (struct sockaddr *) &a), |
595 | (addr->family == |
596 | AF_INET6 ? sizeof(a6) : sizeof(a))); |
c4d8e107 |
597 | #else |
32874aea |
598 | retcode = bind(s, (struct sockaddr *) &a, sizeof(a)); |
c4d8e107 |
599 | #endif |
32874aea |
600 | if (retcode != SOCKET_ERROR) { |
601 | err = 0; |
602 | break; /* done */ |
603 | } else { |
604 | err = WSAGetLastError(); |
605 | if (err != WSAEADDRINUSE) /* failed, for a bad reason */ |
606 | break; |
607 | } |
608 | |
609 | if (localport == 0) |
610 | break; /* we're only looping once */ |
611 | localport--; |
612 | if (localport == 0) |
613 | break; /* we might have got to the end */ |
c91409da |
614 | } |
615 | |
32874aea |
616 | if (err) { |
c4d8e107 |
617 | ret->error = winsock_error_string(err); |
7e78000d |
618 | return (Socket) ret; |
2f75bae1 |
619 | } |
620 | |
621 | /* |
622 | * Connect to remote address. |
623 | */ |
c4d8e107 |
624 | #ifdef IPV6 |
32874aea |
625 | if (addr->family == AF_INET6) { |
626 | memset(&a, 0, sizeof(a)); |
c4d8e107 |
627 | a6.sin6_family = AF_INET6; |
32874aea |
628 | a6.sin6_port = htons((short) port); |
629 | a6.sin6_addr = |
630 | ((struct sockaddr_in6 *) addr->ai->ai_addr)->sin6_addr; |
631 | } else |
c4d8e107 |
632 | #endif |
32874aea |
633 | { |
c4d8e107 |
634 | a.sin_family = AF_INET; |
635 | a.sin_addr.s_addr = htonl(addr->address); |
32874aea |
636 | a.sin_port = htons((short) port); |
c4d8e107 |
637 | } |
3ad9d396 |
638 | |
639 | /* Set up a select mechanism. This could be an AsyncSelect on a |
640 | * window, or an EventSelect on an event object. */ |
641 | errstr = do_select(s, 1); |
642 | if (errstr) { |
643 | ret->error = errstr; |
644 | return (Socket) ret; |
645 | } |
646 | |
32874aea |
647 | if (( |
648 | #ifdef IPV6 |
649 | connect(s, ((addr->family == AF_INET6) ? |
650 | (struct sockaddr *) &a6 : (struct sockaddr *) &a), |
651 | (addr->family == AF_INET6) ? sizeof(a6) : sizeof(a)) |
c4d8e107 |
652 | #else |
32874aea |
653 | connect(s, (struct sockaddr *) &a, sizeof(a)) |
c4d8e107 |
654 | #endif |
32874aea |
655 | ) == SOCKET_ERROR) { |
2f75bae1 |
656 | err = WSAGetLastError(); |
3ad9d396 |
657 | /* |
658 | * We expect a potential EWOULDBLOCK here, because the |
659 | * chances are the front end has done a select for |
660 | * FD_CONNECT, so that connect() will complete |
661 | * asynchronously. |
662 | */ |
663 | if ( err != WSAEWOULDBLOCK ) { |
664 | ret->error = winsock_error_string(err); |
665 | return (Socket) ret; |
666 | } |
667 | } else { |
668 | /* |
669 | * If we _don't_ get EWOULDBLOCK, the connect has completed |
670 | * and we should set the socket as writable. |
671 | */ |
672 | ret->writable = 1; |
2f75bae1 |
673 | } |
674 | |
675 | add234(sktree, ret); |
676 | |
7e78000d |
677 | return (Socket) ret; |
2f75bae1 |
678 | } |
679 | |
6ee9b735 |
680 | Socket sk_newlistener(char *srcaddr, int port, Plug plug, int local_host_only) |
d74d141c |
681 | { |
682 | static struct socket_function_table fn_table = { |
683 | sk_tcp_plug, |
684 | sk_tcp_close, |
685 | sk_tcp_write, |
686 | sk_tcp_write_oob, |
687 | sk_tcp_flush, |
8eebd221 |
688 | sk_tcp_set_private_ptr, |
689 | sk_tcp_get_private_ptr, |
690 | sk_tcp_set_frozen, |
d74d141c |
691 | sk_tcp_socket_error |
692 | }; |
693 | |
694 | SOCKET s; |
695 | #ifdef IPV6 |
696 | SOCKADDR_IN6 a6; |
697 | #endif |
698 | SOCKADDR_IN a; |
699 | DWORD err; |
700 | char *errstr; |
701 | Actual_Socket ret; |
702 | int retcode; |
703 | int on = 1; |
704 | |
705 | /* |
706 | * Create Socket structure. |
707 | */ |
708 | ret = smalloc(sizeof(struct Socket_tag)); |
709 | ret->fn = &fn_table; |
710 | ret->error = NULL; |
711 | ret->plug = plug; |
5471d09a |
712 | bufchain_init(&ret->output_data); |
d74d141c |
713 | ret->writable = 0; /* to start with */ |
714 | ret->sending_oob = 0; |
715 | ret->frozen = 0; |
5471d09a |
716 | ret->frozen_readable = 0; |
bc4802a1 |
717 | ret->localhost_only = local_host_only; |
7732d38a |
718 | ret->pending_error = 0; |
d74d141c |
719 | |
720 | /* |
721 | * Open socket. |
722 | */ |
723 | s = socket(AF_INET, SOCK_STREAM, 0); |
724 | ret->s = s; |
725 | |
726 | if (s == INVALID_SOCKET) { |
727 | err = WSAGetLastError(); |
728 | ret->error = winsock_error_string(err); |
729 | return (Socket) ret; |
730 | } |
731 | |
732 | ret->oobinline = 0; |
733 | |
734 | |
735 | setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (const char *)&on, sizeof(on)); |
736 | |
737 | |
738 | #ifdef IPV6 |
739 | if (addr->family == AF_INET6) { |
740 | memset(&a6, 0, sizeof(a6)); |
741 | a6.sin6_family = AF_INET6; |
6ee9b735 |
742 | /* FIXME: srcaddr is ignored for IPv6, because I (SGT) don't |
743 | * know how to do it. :-) */ |
bcce45ed |
744 | if (local_host_only) |
745 | a6.sin6_addr = in6addr_loopback; |
746 | else |
747 | a6.sin6_addr = in6addr_any; |
d74d141c |
748 | a6.sin6_port = htons(port); |
749 | } else |
750 | #endif |
751 | { |
6ee9b735 |
752 | int got_addr = 0; |
d74d141c |
753 | a.sin_family = AF_INET; |
6ee9b735 |
754 | |
755 | /* |
756 | * Bind to source address. First try an explicitly |
757 | * specified one... |
758 | */ |
759 | if (srcaddr) { |
760 | a.sin_addr.s_addr = inet_addr(srcaddr); |
761 | if (a.sin_addr.s_addr != INADDR_NONE) { |
762 | /* Override localhost_only with specified listen addr. */ |
763 | ret->localhost_only = ipv4_is_loopback(a.sin_addr); |
764 | got_addr = 1; |
765 | } |
766 | } |
767 | |
768 | /* |
769 | * ... and failing that, go with one of the standard ones. |
770 | */ |
771 | if (!got_addr) { |
772 | if (local_host_only) |
773 | a.sin_addr.s_addr = htonl(INADDR_LOOPBACK); |
774 | else |
775 | a.sin_addr.s_addr = htonl(INADDR_ANY); |
776 | } |
777 | |
d74d141c |
778 | a.sin_port = htons((short)port); |
779 | } |
780 | #ifdef IPV6 |
781 | retcode = bind(s, (addr->family == AF_INET6 ? |
782 | (struct sockaddr *) &a6 : |
783 | (struct sockaddr *) &a), |
784 | (addr->family == |
785 | AF_INET6 ? sizeof(a6) : sizeof(a))); |
786 | #else |
787 | retcode = bind(s, (struct sockaddr *) &a, sizeof(a)); |
788 | #endif |
789 | if (retcode != SOCKET_ERROR) { |
790 | err = 0; |
791 | } else { |
792 | err = WSAGetLastError(); |
793 | } |
794 | |
795 | if (err) { |
796 | ret->error = winsock_error_string(err); |
797 | return (Socket) ret; |
798 | } |
799 | |
800 | |
801 | if (listen(s, SOMAXCONN) == SOCKET_ERROR) { |
802 | closesocket(s); |
803 | ret->error = winsock_error_string(err); |
804 | return (Socket) ret; |
805 | } |
806 | |
807 | /* Set up a select mechanism. This could be an AsyncSelect on a |
808 | * window, or an EventSelect on an event object. */ |
809 | errstr = do_select(s, 1); |
810 | if (errstr) { |
811 | ret->error = errstr; |
812 | return (Socket) ret; |
813 | } |
814 | |
815 | add234(sktree, ret); |
816 | |
817 | return (Socket) ret; |
818 | } |
819 | |
32874aea |
820 | static void sk_tcp_close(Socket sock) |
821 | { |
9c964e85 |
822 | extern char *do_select(SOCKET skt, int startup); |
7e78000d |
823 | Actual_Socket s = (Actual_Socket) sock; |
9c964e85 |
824 | |
2f75bae1 |
825 | del234(sktree, s); |
826 | do_select(s->s, 0); |
827 | closesocket(s->s); |
dcbde236 |
828 | sfree(s); |
2f75bae1 |
829 | } |
830 | |
2f75bae1 |
831 | /* |
832 | * The function which tries to send on a socket once it's deemed |
833 | * writable. |
834 | */ |
32874aea |
835 | void try_send(Actual_Socket s) |
836 | { |
5471d09a |
837 | while (s->sending_oob || bufchain_size(&s->output_data) > 0) { |
2f75bae1 |
838 | int nsent; |
839 | DWORD err; |
5471d09a |
840 | void *data; |
32874aea |
841 | int len, urgentflag; |
842 | |
843 | if (s->sending_oob) { |
844 | urgentflag = MSG_OOB; |
845 | len = s->sending_oob; |
5471d09a |
846 | data = &s->oobdata; |
32874aea |
847 | } else { |
848 | urgentflag = 0; |
5471d09a |
849 | bufchain_prefix(&s->output_data, &data, &len); |
32874aea |
850 | } |
5471d09a |
851 | nsent = send(s->s, data, len, urgentflag); |
32874aea |
852 | noise_ultralight(nsent); |
2f75bae1 |
853 | if (nsent <= 0) { |
854 | err = (nsent < 0 ? WSAGetLastError() : 0); |
e5eb3a1c |
855 | if ((err < WSABASEERR && nsent < 0) || err == WSAEWOULDBLOCK) { |
d40a94b9 |
856 | /* |
857 | * Perfectly normal: we've sent all we can for the moment. |
858 | * |
e5eb3a1c |
859 | * (Some WinSock send() implementations can return |
860 | * <0 but leave no sensible error indication - |
861 | * WSAGetLastError() is called but returns zero or |
862 | * a small number - so we check that case and treat |
863 | * it just like WSAEWOULDBLOCK.) |
d40a94b9 |
864 | */ |
2f75bae1 |
865 | s->writable = FALSE; |
32874aea |
866 | return; |
2f75bae1 |
867 | } else if (nsent == 0 || |
32874aea |
868 | err == WSAECONNABORTED || err == WSAECONNRESET) { |
869 | /* |
7732d38a |
870 | * If send() returns CONNABORTED or CONNRESET, we |
871 | * unfortunately can't just call plug_closing(), |
872 | * because it's quite likely that we're currently |
873 | * _in_ a call from the code we'd be calling back |
874 | * to, so we'd have to make half the SSH code |
875 | * reentrant. Instead we flag a pending error on |
876 | * the socket, to be dealt with (by calling |
877 | * plug_closing()) at some suitable future moment. |
32874aea |
878 | */ |
7732d38a |
879 | s->pending_error = err; |
880 | return; |
2f75bae1 |
881 | } else { |
a8327734 |
882 | /* We're inside the Windows frontend here, so we know |
883 | * that the frontend handle is unnecessary. */ |
884 | logevent(NULL, winsock_error_string(err)); |
247308b5 |
885 | fatalbox("%s", winsock_error_string(err)); |
2f75bae1 |
886 | } |
887 | } else { |
5471d09a |
888 | if (s->sending_oob) { |
889 | if (nsent < len) { |
890 | memmove(s->oobdata, s->oobdata+nsent, len-nsent); |
891 | s->sending_oob = len - nsent; |
892 | } else { |
893 | s->sending_oob = 0; |
894 | } |
895 | } else { |
896 | bufchain_consume(&s->output_data, nsent); |
2f75bae1 |
897 | } |
898 | } |
899 | } |
900 | } |
901 | |
5471d09a |
902 | static int sk_tcp_write(Socket sock, char *buf, int len) |
32874aea |
903 | { |
7e78000d |
904 | Actual_Socket s = (Actual_Socket) sock; |
905 | |
2f75bae1 |
906 | /* |
907 | * Add the data to the buffer list on the socket. |
908 | */ |
5471d09a |
909 | bufchain_add(&s->output_data, buf, len); |
2f75bae1 |
910 | |
911 | /* |
912 | * Now try sending from the start of the buffer list. |
913 | */ |
914 | if (s->writable) |
915 | try_send(s); |
5471d09a |
916 | |
917 | return bufchain_size(&s->output_data); |
2f75bae1 |
918 | } |
919 | |
5471d09a |
920 | static int sk_tcp_write_oob(Socket sock, char *buf, int len) |
32874aea |
921 | { |
7e78000d |
922 | Actual_Socket s = (Actual_Socket) sock; |
923 | |
2f75bae1 |
924 | /* |
925 | * Replace the buffer list on the socket with the data. |
926 | */ |
5471d09a |
927 | bufchain_clear(&s->output_data); |
928 | assert(len <= sizeof(s->oobdata)); |
929 | memcpy(s->oobdata, buf, len); |
2f75bae1 |
930 | s->sending_oob = len; |
931 | |
932 | /* |
933 | * Now try sending from the start of the buffer list. |
934 | */ |
935 | if (s->writable) |
936 | try_send(s); |
5471d09a |
937 | |
938 | return s->sending_oob; |
2f75bae1 |
939 | } |
940 | |
32874aea |
941 | int select_result(WPARAM wParam, LPARAM lParam) |
942 | { |
f9d3f227 |
943 | int ret, open; |
2f75bae1 |
944 | DWORD err; |
b675c612 |
945 | char buf[20480]; /* nice big buffer for plenty of speed */ |
7e78000d |
946 | Actual_Socket s; |
49bad831 |
947 | u_long atmark; |
2f75bae1 |
948 | |
949 | /* wParam is the socket itself */ |
cc8b0ee9 |
950 | |
951 | /* |
952 | * One user has reported an assertion failure in tree234 which |
953 | * indicates a null element pointer has been passed to a |
954 | * find*234 function. The following find234 is the only one in |
955 | * the whole program that I can see being capable of doing |
956 | * this, hence I'm forced to conclude that WinSock is capable |
957 | * of sending me netevent messages with wParam==0. I want to |
958 | * know what the rest of the message is if it does so! |
959 | */ |
960 | if (wParam == 0) { |
961 | char *str; |
962 | str = dupprintf("Strange WinSock message: wp=%08x lp=%08x", |
963 | (int)wParam, (int)lParam); |
964 | logevent(NULL, str); |
965 | connection_fatal(NULL, str); |
966 | sfree(str); |
967 | } |
968 | |
32874aea |
969 | s = find234(sktree, (void *) wParam, cmpforsearch); |
2f75bae1 |
970 | if (!s) |
971 | return 1; /* boggle */ |
972 | |
973 | if ((err = WSAGETSELECTERROR(lParam)) != 0) { |
32874aea |
974 | /* |
975 | * An error has occurred on this socket. Pass it to the |
976 | * plug. |
977 | */ |
978 | return plug_closing(s->plug, winsock_error_string(err), err, 0); |
2f75bae1 |
979 | } |
980 | |
7d6ee6ff |
981 | noise_ultralight(lParam); |
982 | |
2f75bae1 |
983 | switch (WSAGETSELECTEVENT(lParam)) { |
3ad9d396 |
984 | case FD_CONNECT: |
985 | s->connected = s->writable = 1; |
986 | break; |
2f75bae1 |
987 | case FD_READ: |
d74d141c |
988 | /* In the case the socket is still frozen, we don't even bother */ |
5471d09a |
989 | if (s->frozen) { |
990 | s->frozen_readable = 1; |
d74d141c |
991 | break; |
5471d09a |
992 | } |
d74d141c |
993 | |
32874aea |
994 | /* |
995 | * We have received data on the socket. For an oobinline |
996 | * socket, this might be data _before_ an urgent pointer, |
997 | * in which case we send it to the back end with type==1 |
998 | * (data prior to urgent). |
999 | */ |
1000 | if (s->oobinline) { |
1001 | atmark = 1; |
1002 | ioctlsocket(s->s, SIOCATMARK, &atmark); |
1003 | /* |
1004 | * Avoid checking the return value from ioctlsocket(), |
1005 | * on the grounds that some WinSock wrappers don't |
1006 | * support it. If it does nothing, we get atmark==1, |
1007 | * which is equivalent to `no OOB pending', so the |
1008 | * effect will be to non-OOB-ify any OOB data. |
1009 | */ |
1010 | } else |
1011 | atmark = 1; |
4b1e8acc |
1012 | |
2f75bae1 |
1013 | ret = recv(s->s, buf, sizeof(buf), 0); |
32874aea |
1014 | noise_ultralight(ret); |
2f75bae1 |
1015 | if (ret < 0) { |
1016 | err = WSAGetLastError(); |
1017 | if (err == WSAEWOULDBLOCK) { |
1018 | break; |
1019 | } |
1020 | } |
1021 | if (ret < 0) { |
32874aea |
1022 | return plug_closing(s->plug, winsock_error_string(err), err, |
1023 | 0); |
7e78000d |
1024 | } else if (0 == ret) { |
32874aea |
1025 | return plug_closing(s->plug, NULL, 0, 0); |
2f75bae1 |
1026 | } else { |
32874aea |
1027 | return plug_receive(s->plug, atmark ? 0 : 1, buf, ret); |
2f75bae1 |
1028 | } |
1029 | break; |
1030 | case FD_OOB: |
32874aea |
1031 | /* |
1032 | * This will only happen on a non-oobinline socket. It |
1033 | * indicates that we can immediately perform an OOB read |
1034 | * and get back OOB data, which we will send to the back |
1035 | * end with type==2 (urgent data). |
1036 | */ |
1037 | ret = recv(s->s, buf, sizeof(buf), MSG_OOB); |
1038 | noise_ultralight(ret); |
1039 | if (ret <= 0) { |
247308b5 |
1040 | char *str = (ret == 0 ? "Internal networking trouble" : |
1041 | winsock_error_string(WSAGetLastError())); |
a8327734 |
1042 | /* We're inside the Windows frontend here, so we know |
1043 | * that the frontend handle is unnecessary. */ |
1044 | logevent(NULL, str); |
247308b5 |
1045 | fatalbox("%s", str); |
32874aea |
1046 | } else { |
1047 | return plug_receive(s->plug, 2, buf, ret); |
1048 | } |
1049 | break; |
2f75bae1 |
1050 | case FD_WRITE: |
5471d09a |
1051 | { |
1052 | int bufsize_before, bufsize_after; |
1053 | s->writable = 1; |
1054 | bufsize_before = s->sending_oob + bufchain_size(&s->output_data); |
1055 | try_send(s); |
1056 | bufsize_after = s->sending_oob + bufchain_size(&s->output_data); |
1057 | if (bufsize_after < bufsize_before) |
1058 | plug_sent(s->plug, bufsize_after); |
1059 | } |
2f75bae1 |
1060 | break; |
1061 | case FD_CLOSE: |
f9d3f227 |
1062 | /* Signal a close on the socket. First read any outstanding data. */ |
32874aea |
1063 | open = 1; |
1064 | do { |
1065 | ret = recv(s->s, buf, sizeof(buf), 0); |
1066 | if (ret < 0) { |
1067 | err = WSAGetLastError(); |
1068 | if (err == WSAEWOULDBLOCK) |
1069 | break; |
1070 | return plug_closing(s->plug, winsock_error_string(err), |
1071 | err, 0); |
1072 | } else { |
1073 | if (ret) |
1074 | open &= plug_receive(s->plug, 0, buf, ret); |
1075 | else |
1076 | open &= plug_closing(s->plug, NULL, 0, 0); |
7e78000d |
1077 | } |
f9d3f227 |
1078 | } while (ret > 0); |
32874aea |
1079 | return open; |
d74d141c |
1080 | case FD_ACCEPT: |
1081 | { |
bc4802a1 |
1082 | struct sockaddr_in isa; |
1083 | int addrlen = sizeof(struct sockaddr_in); |
bcce45ed |
1084 | SOCKET t; /* socket of connection */ |
1085 | |
bc4802a1 |
1086 | memset(&isa, 0, sizeof(struct sockaddr_in)); |
bcce45ed |
1087 | err = 0; |
0e5e7f46 |
1088 | t = accept(s->s,(struct sockaddr *)&isa,&addrlen); |
bcce45ed |
1089 | if (t == INVALID_SOCKET) |
1090 | { |
1091 | err = WSAGetLastError(); |
1092 | if (err == WSATRY_AGAIN) |
1093 | break; |
1094 | } |
1095 | |
6ee9b735 |
1096 | if (s->localhost_only && !ipv4_is_loopback(isa.sin_addr)) { |
bc4802a1 |
1097 | closesocket(t); /* dodgy WinSock let nonlocal through */ |
1098 | } else if (plug_accepting(s->plug, (void*)t)) { |
bcce45ed |
1099 | closesocket(t); /* denied or error */ |
1100 | } |
d74d141c |
1101 | } |
2f75bae1 |
1102 | } |
1103 | |
1104 | return 1; |
1105 | } |
1106 | |
1107 | /* |
7732d38a |
1108 | * Deal with socket errors detected in try_send(). |
1109 | */ |
1110 | void net_pending_errors(void) |
1111 | { |
1112 | int i; |
1113 | Actual_Socket s; |
1114 | |
1115 | /* |
1116 | * This might be a fiddly business, because it's just possible |
1117 | * that handling a pending error on one socket might cause |
1118 | * others to be closed. (I can't think of any reason this might |
1119 | * happen in current SSH implementation, but to maintain |
1120 | * generality of this network layer I'll assume the worst.) |
1121 | * |
1122 | * So what we'll do is search the socket list for _one_ socket |
1123 | * with a pending error, and then handle it, and then search |
1124 | * the list again _from the beginning_. Repeat until we make a |
1125 | * pass with no socket errors present. That way we are |
1126 | * protected against the socket list changing under our feet. |
1127 | */ |
1128 | |
1129 | do { |
1130 | for (i = 0; (s = index234(sktree, i)) != NULL; i++) { |
1131 | if (s->pending_error) { |
1132 | /* |
1133 | * An error has occurred on this socket. Pass it to the |
1134 | * plug. |
1135 | */ |
1136 | plug_closing(s->plug, |
1137 | winsock_error_string(s->pending_error), |
1138 | s->pending_error, 0); |
1139 | break; |
1140 | } |
1141 | } |
1142 | } while (s); |
1143 | } |
1144 | |
1145 | /* |
2f75bae1 |
1146 | * Each socket abstraction contains a `void *' private field in |
1147 | * which the client can keep state. |
1148 | */ |
8eebd221 |
1149 | static void sk_tcp_set_private_ptr(Socket sock, void *ptr) |
32874aea |
1150 | { |
7e78000d |
1151 | Actual_Socket s = (Actual_Socket) sock; |
2f75bae1 |
1152 | s->private_ptr = ptr; |
1153 | } |
32874aea |
1154 | |
8eebd221 |
1155 | static void *sk_tcp_get_private_ptr(Socket sock) |
32874aea |
1156 | { |
7e78000d |
1157 | Actual_Socket s = (Actual_Socket) sock; |
2f75bae1 |
1158 | return s->private_ptr; |
1159 | } |
1160 | |
1161 | /* |
1162 | * Special error values are returned from sk_namelookup and sk_new |
1163 | * if there's a problem. These functions extract an error message, |
1164 | * or return NULL if there's no problem. |
1165 | */ |
32874aea |
1166 | char *sk_addr_error(SockAddr addr) |
1167 | { |
2f75bae1 |
1168 | return addr->error; |
1169 | } |
32874aea |
1170 | static char *sk_tcp_socket_error(Socket sock) |
1171 | { |
7e78000d |
1172 | Actual_Socket s = (Actual_Socket) sock; |
2f75bae1 |
1173 | return s->error; |
1174 | } |
1175 | |
8eebd221 |
1176 | static void sk_tcp_set_frozen(Socket sock, int is_frozen) |
d74d141c |
1177 | { |
1178 | Actual_Socket s = (Actual_Socket) sock; |
5471d09a |
1179 | if (s->frozen == is_frozen) |
1180 | return; |
d74d141c |
1181 | s->frozen = is_frozen; |
5471d09a |
1182 | if (!is_frozen && s->frozen_readable) { |
d74d141c |
1183 | char c; |
1184 | recv(s->s, &c, 1, MSG_PEEK); |
1185 | } |
5471d09a |
1186 | s->frozen_readable = 0; |
d74d141c |
1187 | } |
1188 | |
2f75bae1 |
1189 | /* |
1190 | * For Plink: enumerate all sockets currently active. |
1191 | */ |
32874aea |
1192 | SOCKET first_socket(int *state) |
1193 | { |
d2371c81 |
1194 | Actual_Socket s; |
1195 | *state = 0; |
1196 | s = index234(sktree, (*state)++); |
2f75bae1 |
1197 | return s ? s->s : INVALID_SOCKET; |
1198 | } |
32874aea |
1199 | |
1200 | SOCKET next_socket(int *state) |
1201 | { |
d2371c81 |
1202 | Actual_Socket s = index234(sktree, (*state)++); |
2f75bae1 |
1203 | return s ? s->s : INVALID_SOCKET; |
1204 | } |
68a49acb |
1205 | |
1206 | int net_service_lookup(char *service) |
1207 | { |
1208 | struct servent *se; |
1209 | se = getservbyname(service, NULL); |
1210 | if (se != NULL) |
1211 | return ntohs(se->s_port); |
1212 | else |
1213 | return 0; |
1214 | } |