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> |
2f75bae1 |
51 | |
52 | #include "putty.h" |
53 | #include "network.h" |
54 | #include "tree234.h" |
55 | |
56 | #define BUFFER_GRANULE 512 |
57 | |
58 | struct Socket_tag { |
59 | char *error; |
60 | SOCKET s; |
61 | sk_receiver_t receiver; |
62 | void *private_ptr; |
63 | struct buffer *head, *tail; |
64 | int writable; |
65 | int in_oob, sending_oob; |
66 | }; |
67 | |
68 | struct SockAddr_tag { |
69 | char *error; |
c4d8e107 |
70 | /* address family this belongs to, AF_INET for IPv4, AF_INET6 for IPv6. */ |
71 | int family; |
72 | unsigned long address; /* Address IPv4 style. */ |
73 | #ifdef IPV6 |
74 | struct addrinfo *ai; /* Address IPv6 style. */ |
75 | #endif |
76 | /* |
77 | * We need to have this lengthy enough to hold *any* hostname |
78 | * (including IPv6 reverse...) |
79 | */ |
80 | char realhost[8192]; |
2f75bae1 |
81 | }; |
82 | |
83 | struct buffer { |
84 | struct buffer *next; |
85 | int buflen, bufpos; |
86 | char buf[BUFFER_GRANULE]; |
87 | }; |
88 | |
89 | static tree234 *sktree; |
90 | |
91 | static int cmpfortree(void *av, void *bv) { |
92 | Socket a = (Socket)av, b = (Socket)bv; |
93 | unsigned long as = (unsigned long)a->s, bs = (unsigned long)b->s; |
94 | if (as < bs) return -1; |
95 | if (as > bs) return +1; |
96 | return 0; |
97 | } |
98 | |
99 | static int cmpforsearch(void *av, void *bv) { |
100 | Socket b = (Socket)bv; |
101 | unsigned long as = (unsigned long)av, bs = (unsigned long)b->s; |
102 | if (as < bs) return -1; |
103 | if (as > bs) return +1; |
104 | return 0; |
105 | } |
106 | |
107 | void sk_init(void) { |
108 | sktree = newtree234(cmpfortree); |
109 | } |
110 | |
e74fbad9 |
111 | char *winsock_error_string(int error) { |
112 | switch (error) { |
113 | case WSAEACCES: return "Network error: Permission denied"; |
114 | case WSAEADDRINUSE: return "Network error: Address already in use"; |
115 | case WSAEADDRNOTAVAIL: return "Network error: Cannot assign requested address"; |
116 | case WSAEAFNOSUPPORT: return "Network error: Address family not supported by protocol family"; |
117 | case WSAEALREADY: return "Network error: Operation already in progress"; |
118 | case WSAECONNABORTED: return "Network error: Software caused connection abort"; |
119 | case WSAECONNREFUSED: return "Network error: Connection refused"; |
120 | case WSAECONNRESET: return "Network error: Connection reset by peer"; |
121 | case WSAEDESTADDRREQ: return "Network error: Destination address required"; |
122 | case WSAEFAULT: return "Network error: Bad address"; |
123 | case WSAEHOSTDOWN: return "Network error: Host is down"; |
124 | case WSAEHOSTUNREACH: return "Network error: No route to host"; |
125 | case WSAEINPROGRESS: return "Network error: Operation now in progress"; |
126 | case WSAEINTR: return "Network error: Interrupted function call"; |
127 | case WSAEINVAL: return "Network error: Invalid argument"; |
128 | case WSAEISCONN: return "Network error: Socket is already connected"; |
129 | case WSAEMFILE: return "Network error: Too many open files"; |
130 | case WSAEMSGSIZE: return "Network error: Message too long"; |
131 | case WSAENETDOWN: return "Network error: Network is down"; |
132 | case WSAENETRESET: return "Network error: Network dropped connection on reset"; |
133 | case WSAENETUNREACH: return "Network error: Network is unreachable"; |
134 | case WSAENOBUFS: return "Network error: No buffer space available"; |
135 | case WSAENOPROTOOPT: return "Network error: Bad protocol option"; |
136 | case WSAENOTCONN: return "Network error: Socket is not connected"; |
137 | case WSAENOTSOCK: return "Network error: Socket operation on non-socket"; |
138 | case WSAEOPNOTSUPP: return "Network error: Operation not supported"; |
139 | case WSAEPFNOSUPPORT: return "Network error: Protocol family not supported"; |
140 | case WSAEPROCLIM: return "Network error: Too many processes"; |
141 | case WSAEPROTONOSUPPORT: return "Network error: Protocol not supported"; |
142 | case WSAEPROTOTYPE: return "Network error: Protocol wrong type for socket"; |
143 | case WSAESHUTDOWN: return "Network error: Cannot send after socket shutdown"; |
144 | case WSAESOCKTNOSUPPORT: return "Network error: Socket type not supported"; |
145 | case WSAETIMEDOUT: return "Network error: Connection timed out"; |
146 | case WSAEWOULDBLOCK: return "Network error: Resource temporarily unavailable"; |
147 | case WSAEDISCON: return "Network error: Graceful shutdown in progress"; |
148 | default: return "Unknown network error"; |
149 | } |
150 | } |
151 | |
c4d8e107 |
152 | SockAddr sk_namelookup(char *host, char **canonicalname) |
153 | { |
2f75bae1 |
154 | SockAddr ret = smalloc(sizeof(struct SockAddr_tag)); |
155 | unsigned long a; |
c4d8e107 |
156 | struct hostent *h = NULL; |
2f75bae1 |
157 | |
c4d8e107 |
158 | /* Clear the structure and default to IPv4. */ |
159 | memset(ret, 0, sizeof(struct SockAddr_tag)); |
160 | ret->family = 0; /* We set this one when we have resolved the host. */ |
161 | *canonicalname = ret->realhost; /* This makes sure we always have a hostname to return. */ |
162 | |
163 | if ( (a = inet_addr(host)) == (unsigned long) INADDR_NONE) |
164 | { |
165 | #ifdef IPV6 |
166 | |
167 | /* Try to get the getaddrinfo() function from wship6.dll */ |
168 | /* This way one doesn't need to have IPv6 dll's to use PuTTY and |
169 | * it will fallback to IPv4. */ |
170 | typedef int (CALLBACK* FGETADDRINFO)(const char *nodename, |
171 | const char *servname, |
172 | const struct addrinfo *hints, |
173 | struct addrinfo **res); |
174 | FGETADDRINFO fGetAddrInfo = NULL; |
175 | |
176 | HINSTANCE dllWSHIP6 = LoadLibrary("wship6.dll"); |
177 | if (dllWSHIP6) |
178 | fGetAddrInfo = (FGETADDRINFO)GetProcAddress(dllWSHIP6, |
179 | "getaddrinfo"); |
180 | |
181 | /* |
182 | * Use fGetAddrInfo when it's available (which usually also |
183 | * means IPv6 is installed...) |
184 | */ |
185 | if (fGetAddrInfo) |
186 | { |
187 | /*debug(("Resolving \"%s\" with getaddrinfo() (IPv4+IPv6 capable)...\n", host)); */ |
188 | if (fGetAddrInfo(host, NULL, NULL, &ret->ai) == 0) |
189 | ret->family = ret->ai->ai_family; |
190 | } |
191 | else |
192 | #endif |
193 | /* |
194 | * Otherwise use the IPv4-only gethostbyname... |
195 | * (NOTE: we don't use gethostbyname as a |
196 | * fallback!) |
197 | */ |
198 | if (ret->family == 0) |
199 | { |
200 | /*debug(("Resolving \"%s\" with gethostbyname() (IPv4 only)...\n", host)); */ |
201 | if (h = gethostbyname(host)) ret->family = AF_INET; |
202 | } |
203 | /*debug(("Done resolving...(family is %d) AF_INET = %d, AF_INET6 = %d\n", ret->family, AF_INET, AF_INET6)); */ |
204 | |
205 | if (ret->family == 0) |
206 | { |
2f75bae1 |
207 | DWORD err = WSAGetLastError(); |
c4d8e107 |
208 | ret->error = (err == WSAENETDOWN ? "Network is down" : |
209 | err == WSAHOST_NOT_FOUND ? "Host does not exist" : |
210 | err == WSATRY_AGAIN ? "Host not found" : |
211 | #ifdef IPV6 |
212 | fGetAddrInfo ? "getaddrinfo: unknown error" : |
213 | #endif |
214 | "gethostbyname: unknown error"); |
215 | #ifdef DEBUG |
216 | { |
217 | LPVOID lpMsgBuf; |
218 | FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS, NULL, err, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), (LPTSTR)&lpMsgBuf, 0, NULL); |
bc51302a |
219 | /*debug(("Error %ld: %s (h=%lx)\n", err, lpMsgBuf, h));*/ |
c4d8e107 |
220 | /* Free the buffer. */ |
221 | LocalFree(lpMsgBuf); |
222 | } |
223 | #endif |
2f75bae1 |
224 | } |
c4d8e107 |
225 | else |
226 | { |
227 | ret->error = NULL; |
228 | |
229 | #ifdef IPV6 |
230 | /* If we got an address info use that... */ |
231 | if (ret->ai) |
232 | { |
233 | typedef int (CALLBACK* FGETNAMEINFO) |
234 | (const struct sockaddr FAR *sa, socklen_t salen, |
235 | char FAR * host, size_t hostlen, char FAR * serv, |
236 | size_t servlen, int flags); |
237 | FGETNAMEINFO fGetNameInfo = NULL; |
238 | |
239 | /* Are we in IPv4 fallback mode? */ |
240 | /* We put the IPv4 address into the a variable so we can further-on use the IPv4 code... */ |
241 | if (ret->family == AF_INET) |
242 | memcpy(&a, (char *)&((SOCKADDR_IN *)ret->ai->ai_addr)->sin_addr, sizeof(a)); |
243 | |
244 | /* Now let's find that canonicalname... */ |
245 | if ((dllWSHIP6) && (fGetNameInfo = (FGETNAMEINFO)GetProcAddress(dllWSHIP6, "getnameinfo"))) |
246 | { |
247 | if (fGetNameInfo((struct sockaddr *)ret->ai->ai_addr, |
248 | ret->family == AF_INET ? |
249 | sizeof(SOCKADDR_IN) : |
250 | sizeof(SOCKADDR_IN6), ret->realhost, |
251 | sizeof(ret->realhost), NULL, |
252 | 0, 0) != 0) |
253 | { |
254 | strncpy(ret->realhost, host, |
255 | sizeof(ret->realhost)); |
256 | } |
257 | } |
258 | } |
259 | /* We used the IPv4-only gethostbyname()... */ |
260 | else |
261 | { |
262 | #endif |
263 | memcpy(&a, h->h_addr, sizeof(a)); |
264 | /* This way we are always sure the h->h_name is valid :) */ |
265 | strncpy(ret->realhost, h->h_name, sizeof(ret->realhost)); |
266 | #ifdef IPV6 |
267 | } |
268 | #endif |
269 | } |
270 | #ifdef IPV6 |
271 | FreeLibrary(dllWSHIP6); |
272 | #endif |
273 | } |
274 | else |
275 | { |
9d47d0ea |
276 | /* |
277 | * Hack inserted to deal with problems with numeric IPs. |
278 | * FIXME: how will this work in IPv6? |
279 | */ |
280 | ret->family = AF_INET; |
2f75bae1 |
281 | *canonicalname = host; |
282 | } |
283 | ret->address = ntohl(a); |
2f75bae1 |
284 | return ret; |
285 | } |
286 | |
287 | void sk_addr_free(SockAddr addr) { |
288 | sfree(addr); |
289 | } |
290 | |
c91409da |
291 | Socket sk_new(SockAddr addr, int port, int privport, sk_receiver_t receiver) { |
2f75bae1 |
292 | SOCKET s; |
c4d8e107 |
293 | #ifdef IPV6 |
294 | SOCKADDR_IN6 a6; |
295 | #endif |
2f75bae1 |
296 | SOCKADDR_IN a; |
297 | DWORD err; |
298 | char *errstr; |
299 | Socket ret; |
300 | extern char *do_select(SOCKET skt, int startup); |
c91409da |
301 | short localport; |
2f75bae1 |
302 | |
303 | /* |
304 | * Create Socket structure. |
305 | */ |
306 | ret = smalloc(sizeof(struct Socket_tag)); |
307 | ret->error = NULL; |
308 | ret->receiver = receiver; |
309 | ret->head = ret->tail = NULL; |
310 | ret->writable = 1; /* to start with */ |
311 | ret->in_oob = FALSE; |
33232c8f |
312 | ret->sending_oob = 0; |
2f75bae1 |
313 | |
314 | /* |
315 | * Open socket. |
316 | */ |
c4d8e107 |
317 | s = socket(addr->family, SOCK_STREAM, 0); |
2f75bae1 |
318 | ret->s = s; |
319 | |
320 | if (s == INVALID_SOCKET) { |
321 | err = WSAGetLastError(); |
e74fbad9 |
322 | ret->error = winsock_error_string(err); |
2f75bae1 |
323 | return ret; |
324 | } |
325 | |
326 | /* |
327 | * Bind to local address. |
328 | */ |
c91409da |
329 | if (privport) |
330 | localport = 1023; /* count from 1023 downwards */ |
c4d8e107 |
331 | else |
c91409da |
332 | localport = 0; /* just use port 0 (ie winsock picks) */ |
333 | |
334 | /* Loop round trying to bind */ |
335 | while (1) { |
336 | int retcode; |
337 | |
338 | #ifdef IPV6 |
339 | if (addr->family == AF_INET6) |
340 | { |
341 | memset(&a6,0,sizeof(a6)); |
342 | a6.sin6_family = AF_INET6; |
343 | /*a6.sin6_addr = in6addr_any;*/ /* == 0 */ |
344 | a6.sin6_port = htons(localport); |
345 | } |
346 | else |
347 | { |
c4d8e107 |
348 | #endif |
c91409da |
349 | a.sin_family = AF_INET; |
350 | a.sin_addr.s_addr = htonl(INADDR_ANY); |
351 | a.sin_port = htons(localport); |
c4d8e107 |
352 | #ifdef IPV6 |
c91409da |
353 | } |
354 | retcode = bind (s, (addr->family == AF_INET6 ? |
355 | (struct sockaddr *)&a6 : |
356 | (struct sockaddr *)&a), |
357 | (addr->family == AF_INET6 ? sizeof(a6) : sizeof(a))); |
c4d8e107 |
358 | #else |
c91409da |
359 | retcode = bind (s, (struct sockaddr *)&a, sizeof(a)); |
c4d8e107 |
360 | #endif |
c91409da |
361 | if (retcode != SOCKET_ERROR) { |
362 | err = 0; |
363 | break; /* done */ |
364 | } else { |
365 | err = WSAGetLastError(); |
366 | if (err != WSAEADDRINUSE) /* failed, for a bad reason */ |
367 | break; |
368 | } |
369 | |
370 | if (localport == 0) |
371 | break; /* we're only looping once */ |
372 | localport--; |
373 | if (localport == 0) |
374 | break; /* we might have got to the end */ |
375 | } |
376 | |
377 | if (err) |
c4d8e107 |
378 | { |
c4d8e107 |
379 | ret->error = winsock_error_string(err); |
2f75bae1 |
380 | return ret; |
381 | } |
382 | |
383 | /* |
384 | * Connect to remote address. |
385 | */ |
c4d8e107 |
386 | #ifdef IPV6 |
387 | if (addr->family == AF_INET6) |
388 | { |
389 | memset(&a,0,sizeof(a)); |
390 | a6.sin6_family = AF_INET6; |
391 | a6.sin6_port = htons((short)port); |
392 | a6.sin6_addr = ((struct sockaddr_in6 *)addr->ai->ai_addr)->sin6_addr; |
393 | } |
394 | else |
395 | { |
396 | #endif |
397 | a.sin_family = AF_INET; |
398 | a.sin_addr.s_addr = htonl(addr->address); |
399 | a.sin_port = htons((short)port); |
400 | #ifdef IPV6 |
401 | } |
402 | if (connect (s, (addr->family == AF_INET6) ? (struct sockaddr *)&a6 : (struct sockaddr *)&a, (addr->family == AF_INET6) ? sizeof(a6) : sizeof(a)) == SOCKET_ERROR) |
403 | #else |
404 | if (connect (s, (struct sockaddr *)&a, sizeof(a)) == SOCKET_ERROR) |
405 | #endif |
406 | { |
2f75bae1 |
407 | err = WSAGetLastError(); |
c4d8e107 |
408 | ret->error = winsock_error_string(err); |
2f75bae1 |
409 | return ret; |
410 | } |
411 | |
412 | /* Set up a select mechanism. This could be an AsyncSelect on a |
413 | * window, or an EventSelect on an event object. */ |
414 | errstr = do_select(s, 1); |
415 | if (errstr) { |
416 | ret->error = errstr; |
417 | return ret; |
418 | } |
419 | |
420 | add234(sktree, ret); |
421 | |
422 | return ret; |
423 | } |
424 | |
425 | void sk_close(Socket s) { |
9c964e85 |
426 | extern char *do_select(SOCKET skt, int startup); |
427 | |
2f75bae1 |
428 | del234(sktree, s); |
429 | do_select(s->s, 0); |
430 | closesocket(s->s); |
dcbde236 |
431 | sfree(s); |
2f75bae1 |
432 | } |
433 | |
2f75bae1 |
434 | /* |
435 | * The function which tries to send on a socket once it's deemed |
436 | * writable. |
437 | */ |
438 | void try_send(Socket s) { |
439 | while (s->head) { |
440 | int nsent; |
441 | DWORD err; |
442 | int len, urgentflag; |
443 | |
444 | if (s->sending_oob) { |
445 | urgentflag = MSG_OOB; |
446 | len = s->sending_oob; |
447 | } else { |
448 | urgentflag = 0; |
449 | len = s->head->buflen - s->head->bufpos; |
450 | } |
451 | |
452 | nsent = send(s->s, s->head->buf + s->head->bufpos, len, urgentflag); |
7d6ee6ff |
453 | noise_ultralight(nsent); |
2f75bae1 |
454 | if (nsent <= 0) { |
455 | err = (nsent < 0 ? WSAGetLastError() : 0); |
456 | if (err == WSAEWOULDBLOCK) { |
457 | /* Perfectly normal: we've sent all we can for the moment. */ |
458 | s->writable = FALSE; |
459 | return; |
460 | } else if (nsent == 0 || |
461 | err == WSAECONNABORTED || |
462 | err == WSAECONNRESET) { |
463 | /* |
464 | * FIXME. This will have to be done better when we |
465 | * start managing multiple sockets (e.g. SSH port |
466 | * forwarding), because if we get CONNRESET while |
467 | * trying to write a particular forwarded socket |
468 | * then it isn't necessarily the end of the world. |
469 | * Ideally I'd like to pass the error code back to |
470 | * somewhere the next select_result() will see it, |
471 | * but that might be hard. Perhaps I should pass it |
472 | * back to be queued in the Windows front end bit. |
473 | */ |
474 | fatalbox(winsock_error_string(err)); |
475 | } else { |
476 | fatalbox(winsock_error_string(err)); |
477 | } |
478 | } else { |
479 | s->head->bufpos += nsent; |
480 | if (s->sending_oob) |
481 | s->sending_oob -= nsent; |
482 | if (s->head->bufpos >= s->head->buflen) { |
483 | struct buffer *tmp = s->head; |
484 | s->head = tmp->next; |
dcbde236 |
485 | sfree(tmp); |
2f75bae1 |
486 | if (!s->head) |
487 | s->tail = NULL; |
488 | } |
489 | } |
490 | } |
491 | } |
492 | |
493 | void sk_write(Socket s, char *buf, int len) { |
494 | /* |
495 | * Add the data to the buffer list on the socket. |
496 | */ |
497 | if (s->tail && s->tail->buflen < BUFFER_GRANULE) { |
498 | int copylen = min(len, BUFFER_GRANULE - s->tail->buflen); |
499 | memcpy(s->tail->buf + s->tail->buflen, buf, copylen); |
500 | buf += copylen; |
501 | len -= copylen; |
502 | s->tail->buflen += copylen; |
503 | } |
504 | while (len > 0) { |
505 | int grainlen = min(len, BUFFER_GRANULE); |
506 | struct buffer *newbuf; |
507 | newbuf = smalloc(sizeof(struct buffer)); |
508 | newbuf->bufpos = 0; |
509 | newbuf->buflen = grainlen; |
510 | memcpy(newbuf->buf, buf, grainlen); |
511 | buf += grainlen; |
512 | len -= grainlen; |
513 | if (s->tail) |
514 | s->tail->next = newbuf; |
515 | else |
516 | s->head = s->tail = newbuf; |
517 | newbuf->next = NULL; |
518 | s->tail = newbuf; |
519 | } |
520 | |
521 | /* |
522 | * Now try sending from the start of the buffer list. |
523 | */ |
524 | if (s->writable) |
525 | try_send(s); |
526 | } |
527 | |
528 | void sk_write_oob(Socket s, char *buf, int len) { |
529 | /* |
530 | * Replace the buffer list on the socket with the data. |
531 | */ |
532 | if (!s->head) { |
533 | s->head = smalloc(sizeof(struct buffer)); |
534 | } else { |
535 | struct buffer *walk = s->head->next; |
536 | while (walk) { |
537 | struct buffer *tmp = walk; |
538 | walk = tmp->next; |
dcbde236 |
539 | sfree(tmp); |
2f75bae1 |
540 | } |
541 | } |
542 | s->head->next = NULL; |
543 | s->tail = s->head; |
544 | s->head->buflen = len; |
545 | memcpy(s->head->buf, buf, len); |
546 | |
547 | /* |
548 | * Set the Urgent marker. |
549 | */ |
550 | s->sending_oob = len; |
551 | |
552 | /* |
553 | * Now try sending from the start of the buffer list. |
554 | */ |
555 | if (s->writable) |
556 | try_send(s); |
557 | } |
558 | |
559 | int select_result(WPARAM wParam, LPARAM lParam) { |
560 | int ret; |
561 | DWORD err; |
562 | char buf[BUFFER_GRANULE]; |
563 | Socket s; |
49bad831 |
564 | u_long atmark; |
2f75bae1 |
565 | |
566 | /* wParam is the socket itself */ |
567 | s = find234(sktree, (void *)wParam, cmpforsearch); |
568 | if (!s) |
569 | return 1; /* boggle */ |
570 | |
571 | if ((err = WSAGETSELECTERROR(lParam)) != 0) { |
2c94fd1c |
572 | /* |
573 | * An error has occurred on this socket. Pass it to the |
574 | * receiver function. |
575 | */ |
576 | return s->receiver(s, 3, winsock_error_string(err), err); |
2f75bae1 |
577 | } |
578 | |
7d6ee6ff |
579 | noise_ultralight(lParam); |
580 | |
2f75bae1 |
581 | switch (WSAGETSELECTEVENT(lParam)) { |
582 | case FD_READ: |
583 | ret = recv(s->s, buf, sizeof(buf), 0); |
584 | if (ret < 0) { |
585 | err = WSAGetLastError(); |
586 | if (err == WSAEWOULDBLOCK) { |
587 | break; |
588 | } |
589 | } |
590 | if (ret < 0) { |
2c94fd1c |
591 | return s->receiver(s, 3, winsock_error_string(err), err); |
2f75bae1 |
592 | } else { |
593 | int type = s->in_oob ? 2 : 0; |
594 | s->in_oob = FALSE; |
595 | return s->receiver(s, type, buf, ret); |
596 | } |
597 | break; |
598 | case FD_OOB: |
599 | /* |
600 | * Read all data up to the OOB marker, and send it to the |
601 | * receiver with urgent==1 (OOB pending). |
602 | */ |
603 | atmark = 1; |
604 | s->in_oob = TRUE; |
605 | /* Some WinSock wrappers don't support this call, so we |
606 | * deliberately don't check the return value. If the call |
607 | * fails and does nothing, we will get back atmark==1, |
608 | * which is good enough to keep going at least. */ |
609 | ioctlsocket(s->s, SIOCATMARK, &atmark); |
610 | ret = recv(s->s, buf, sizeof(buf), MSG_OOB); |
7d6ee6ff |
611 | noise_ultralight(ret); |
2f75bae1 |
612 | if (ret <= 0) { |
613 | fatalbox(ret == 0 ? "Internal networking trouble" : |
614 | winsock_error_string(WSAGetLastError())); |
615 | } else { |
616 | return s->receiver(s, atmark ? 2 : 1, buf, ret); |
617 | } |
618 | break; |
619 | case FD_WRITE: |
620 | s->writable = 1; |
621 | try_send(s); |
622 | break; |
623 | case FD_CLOSE: |
624 | /* Signal a close on the socket. */ |
625 | return s->receiver(s, 0, NULL, 0); |
626 | break; |
627 | } |
628 | |
629 | return 1; |
630 | } |
631 | |
632 | /* |
633 | * Each socket abstraction contains a `void *' private field in |
634 | * which the client can keep state. |
635 | */ |
636 | void sk_set_private_ptr(Socket s, void *ptr) { |
637 | s->private_ptr = ptr; |
638 | } |
639 | void *sk_get_private_ptr(Socket s) { |
640 | return s->private_ptr; |
641 | } |
642 | |
643 | /* |
644 | * Special error values are returned from sk_namelookup and sk_new |
645 | * if there's a problem. These functions extract an error message, |
646 | * or return NULL if there's no problem. |
647 | */ |
648 | char *sk_addr_error(SockAddr addr) { |
649 | return addr->error; |
650 | } |
651 | char *sk_socket_error(Socket s) { |
652 | return s->error; |
653 | } |
654 | |
655 | /* |
656 | * For Plink: enumerate all sockets currently active. |
657 | */ |
658 | SOCKET first_socket(enum234 *e) { |
659 | Socket s = first234(sktree, e); |
660 | return s ? s->s : INVALID_SOCKET; |
661 | } |
662 | SOCKET next_socket(enum234 *e) { |
663 | Socket s = next234(e); |
664 | return s ? s->s : INVALID_SOCKET; |
665 | } |