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 | |
7e78000d |
52 | #define DEFINE_PLUG_METHOD_MACROS |
2f75bae1 |
53 | #include "putty.h" |
54 | #include "network.h" |
55 | #include "tree234.h" |
56 | |
b675c612 |
57 | #define BUFFER_GRANULE 512 |
2f75bae1 |
58 | |
59 | struct Socket_tag { |
7e78000d |
60 | struct socket_function_table *fn; |
61 | /* the above variable absolutely *must* be the first in this structure */ |
2f75bae1 |
62 | char *error; |
63 | SOCKET s; |
7e78000d |
64 | Plug plug; |
2f75bae1 |
65 | void *private_ptr; |
66 | struct buffer *head, *tail; |
67 | int writable; |
1ad4eb6f |
68 | int sending_oob; |
4b1e8acc |
69 | int oobinline; |
2f75bae1 |
70 | }; |
71 | |
7e78000d |
72 | /* |
73 | * We used to typedef struct Socket_tag *Socket. |
74 | * |
75 | * Since we have made the networking abstraction slightly more |
76 | * abstract, Socket no longer means a tcp socket (it could mean |
77 | * an ssl socket). So now we must use Actual_Socket when we know |
78 | * we are talking about a tcp socket. |
79 | */ |
80 | typedef struct Socket_tag *Actual_Socket; |
81 | |
2f75bae1 |
82 | struct SockAddr_tag { |
83 | char *error; |
c4d8e107 |
84 | /* address family this belongs to, AF_INET for IPv4, AF_INET6 for IPv6. */ |
85 | int family; |
86 | unsigned long address; /* Address IPv4 style. */ |
87 | #ifdef IPV6 |
88 | struct addrinfo *ai; /* Address IPv6 style. */ |
89 | #endif |
90 | /* |
91 | * We need to have this lengthy enough to hold *any* hostname |
92 | * (including IPv6 reverse...) |
93 | */ |
94 | char realhost[8192]; |
2f75bae1 |
95 | }; |
96 | |
97 | struct buffer { |
98 | struct buffer *next; |
99 | int buflen, bufpos; |
100 | char buf[BUFFER_GRANULE]; |
101 | }; |
102 | |
103 | static tree234 *sktree; |
104 | |
105 | static int cmpfortree(void *av, void *bv) { |
7e78000d |
106 | Actual_Socket a = (Actual_Socket)av, b = (Actual_Socket)bv; |
2f75bae1 |
107 | unsigned long as = (unsigned long)a->s, bs = (unsigned long)b->s; |
108 | if (as < bs) return -1; |
109 | if (as > bs) return +1; |
110 | return 0; |
111 | } |
112 | |
113 | static int cmpforsearch(void *av, void *bv) { |
7e78000d |
114 | Actual_Socket b = (Actual_Socket)bv; |
2f75bae1 |
115 | unsigned long as = (unsigned long)av, bs = (unsigned long)b->s; |
116 | if (as < bs) return -1; |
117 | if (as > bs) return +1; |
118 | return 0; |
119 | } |
120 | |
121 | void sk_init(void) { |
122 | sktree = newtree234(cmpfortree); |
123 | } |
124 | |
e74fbad9 |
125 | char *winsock_error_string(int error) { |
126 | switch (error) { |
127 | case WSAEACCES: return "Network error: Permission denied"; |
128 | case WSAEADDRINUSE: return "Network error: Address already in use"; |
129 | case WSAEADDRNOTAVAIL: return "Network error: Cannot assign requested address"; |
130 | case WSAEAFNOSUPPORT: return "Network error: Address family not supported by protocol family"; |
131 | case WSAEALREADY: return "Network error: Operation already in progress"; |
132 | case WSAECONNABORTED: return "Network error: Software caused connection abort"; |
133 | case WSAECONNREFUSED: return "Network error: Connection refused"; |
134 | case WSAECONNRESET: return "Network error: Connection reset by peer"; |
135 | case WSAEDESTADDRREQ: return "Network error: Destination address required"; |
136 | case WSAEFAULT: return "Network error: Bad address"; |
137 | case WSAEHOSTDOWN: return "Network error: Host is down"; |
138 | case WSAEHOSTUNREACH: return "Network error: No route to host"; |
139 | case WSAEINPROGRESS: return "Network error: Operation now in progress"; |
140 | case WSAEINTR: return "Network error: Interrupted function call"; |
141 | case WSAEINVAL: return "Network error: Invalid argument"; |
142 | case WSAEISCONN: return "Network error: Socket is already connected"; |
143 | case WSAEMFILE: return "Network error: Too many open files"; |
144 | case WSAEMSGSIZE: return "Network error: Message too long"; |
145 | case WSAENETDOWN: return "Network error: Network is down"; |
146 | case WSAENETRESET: return "Network error: Network dropped connection on reset"; |
147 | case WSAENETUNREACH: return "Network error: Network is unreachable"; |
148 | case WSAENOBUFS: return "Network error: No buffer space available"; |
149 | case WSAENOPROTOOPT: return "Network error: Bad protocol option"; |
150 | case WSAENOTCONN: return "Network error: Socket is not connected"; |
151 | case WSAENOTSOCK: return "Network error: Socket operation on non-socket"; |
152 | case WSAEOPNOTSUPP: return "Network error: Operation not supported"; |
153 | case WSAEPFNOSUPPORT: return "Network error: Protocol family not supported"; |
154 | case WSAEPROCLIM: return "Network error: Too many processes"; |
155 | case WSAEPROTONOSUPPORT: return "Network error: Protocol not supported"; |
156 | case WSAEPROTOTYPE: return "Network error: Protocol wrong type for socket"; |
157 | case WSAESHUTDOWN: return "Network error: Cannot send after socket shutdown"; |
158 | case WSAESOCKTNOSUPPORT: return "Network error: Socket type not supported"; |
159 | case WSAETIMEDOUT: return "Network error: Connection timed out"; |
160 | case WSAEWOULDBLOCK: return "Network error: Resource temporarily unavailable"; |
161 | case WSAEDISCON: return "Network error: Graceful shutdown in progress"; |
162 | default: return "Unknown network error"; |
163 | } |
164 | } |
165 | |
c4d8e107 |
166 | SockAddr sk_namelookup(char *host, char **canonicalname) |
167 | { |
2f75bae1 |
168 | SockAddr ret = smalloc(sizeof(struct SockAddr_tag)); |
169 | unsigned long a; |
c4d8e107 |
170 | struct hostent *h = NULL; |
2f75bae1 |
171 | |
c4d8e107 |
172 | /* Clear the structure and default to IPv4. */ |
173 | memset(ret, 0, sizeof(struct SockAddr_tag)); |
174 | ret->family = 0; /* We set this one when we have resolved the host. */ |
175 | *canonicalname = ret->realhost; /* This makes sure we always have a hostname to return. */ |
176 | |
177 | if ( (a = inet_addr(host)) == (unsigned long) INADDR_NONE) |
178 | { |
179 | #ifdef IPV6 |
180 | |
181 | /* Try to get the getaddrinfo() function from wship6.dll */ |
182 | /* This way one doesn't need to have IPv6 dll's to use PuTTY and |
183 | * it will fallback to IPv4. */ |
184 | typedef int (CALLBACK* FGETADDRINFO)(const char *nodename, |
185 | const char *servname, |
186 | const struct addrinfo *hints, |
187 | struct addrinfo **res); |
188 | FGETADDRINFO fGetAddrInfo = NULL; |
189 | |
190 | HINSTANCE dllWSHIP6 = LoadLibrary("wship6.dll"); |
191 | if (dllWSHIP6) |
192 | fGetAddrInfo = (FGETADDRINFO)GetProcAddress(dllWSHIP6, |
193 | "getaddrinfo"); |
194 | |
195 | /* |
196 | * Use fGetAddrInfo when it's available (which usually also |
197 | * means IPv6 is installed...) |
198 | */ |
199 | if (fGetAddrInfo) |
200 | { |
201 | /*debug(("Resolving \"%s\" with getaddrinfo() (IPv4+IPv6 capable)...\n", host)); */ |
202 | if (fGetAddrInfo(host, NULL, NULL, &ret->ai) == 0) |
203 | ret->family = ret->ai->ai_family; |
204 | } |
205 | else |
206 | #endif |
207 | /* |
208 | * Otherwise use the IPv4-only gethostbyname... |
209 | * (NOTE: we don't use gethostbyname as a |
210 | * fallback!) |
211 | */ |
212 | if (ret->family == 0) |
213 | { |
214 | /*debug(("Resolving \"%s\" with gethostbyname() (IPv4 only)...\n", host)); */ |
215 | if (h = gethostbyname(host)) ret->family = AF_INET; |
216 | } |
217 | /*debug(("Done resolving...(family is %d) AF_INET = %d, AF_INET6 = %d\n", ret->family, AF_INET, AF_INET6)); */ |
218 | |
219 | if (ret->family == 0) |
220 | { |
2f75bae1 |
221 | DWORD err = WSAGetLastError(); |
c4d8e107 |
222 | ret->error = (err == WSAENETDOWN ? "Network is down" : |
223 | err == WSAHOST_NOT_FOUND ? "Host does not exist" : |
224 | err == WSATRY_AGAIN ? "Host not found" : |
225 | #ifdef IPV6 |
226 | fGetAddrInfo ? "getaddrinfo: unknown error" : |
227 | #endif |
228 | "gethostbyname: unknown error"); |
229 | #ifdef DEBUG |
230 | { |
231 | LPVOID lpMsgBuf; |
232 | 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 |
233 | /*debug(("Error %ld: %s (h=%lx)\n", err, lpMsgBuf, h));*/ |
c4d8e107 |
234 | /* Free the buffer. */ |
235 | LocalFree(lpMsgBuf); |
236 | } |
237 | #endif |
2f75bae1 |
238 | } |
c4d8e107 |
239 | else |
240 | { |
241 | ret->error = NULL; |
242 | |
243 | #ifdef IPV6 |
244 | /* If we got an address info use that... */ |
245 | if (ret->ai) |
246 | { |
247 | typedef int (CALLBACK* FGETNAMEINFO) |
248 | (const struct sockaddr FAR *sa, socklen_t salen, |
249 | char FAR * host, size_t hostlen, char FAR * serv, |
250 | size_t servlen, int flags); |
251 | FGETNAMEINFO fGetNameInfo = NULL; |
252 | |
253 | /* Are we in IPv4 fallback mode? */ |
254 | /* We put the IPv4 address into the a variable so we can further-on use the IPv4 code... */ |
255 | if (ret->family == AF_INET) |
256 | memcpy(&a, (char *)&((SOCKADDR_IN *)ret->ai->ai_addr)->sin_addr, sizeof(a)); |
257 | |
258 | /* Now let's find that canonicalname... */ |
259 | if ((dllWSHIP6) && (fGetNameInfo = (FGETNAMEINFO)GetProcAddress(dllWSHIP6, "getnameinfo"))) |
260 | { |
261 | if (fGetNameInfo((struct sockaddr *)ret->ai->ai_addr, |
262 | ret->family == AF_INET ? |
263 | sizeof(SOCKADDR_IN) : |
264 | sizeof(SOCKADDR_IN6), ret->realhost, |
265 | sizeof(ret->realhost), NULL, |
266 | 0, 0) != 0) |
267 | { |
268 | strncpy(ret->realhost, host, |
269 | sizeof(ret->realhost)); |
270 | } |
271 | } |
272 | } |
273 | /* We used the IPv4-only gethostbyname()... */ |
274 | else |
275 | { |
276 | #endif |
277 | memcpy(&a, h->h_addr, sizeof(a)); |
278 | /* This way we are always sure the h->h_name is valid :) */ |
279 | strncpy(ret->realhost, h->h_name, sizeof(ret->realhost)); |
280 | #ifdef IPV6 |
281 | } |
282 | #endif |
283 | } |
284 | #ifdef IPV6 |
285 | FreeLibrary(dllWSHIP6); |
286 | #endif |
287 | } |
288 | else |
289 | { |
87ed061f |
290 | /* |
291 | * This must be a numeric IPv4 address because it caused a |
292 | * success return from inet_addr. |
293 | */ |
9d47d0ea |
294 | ret->family = AF_INET; |
2f75bae1 |
295 | *canonicalname = host; |
296 | } |
297 | ret->address = ntohl(a); |
2f75bae1 |
298 | return ret; |
299 | } |
300 | |
301 | void sk_addr_free(SockAddr addr) { |
302 | sfree(addr); |
303 | } |
304 | |
7e78000d |
305 | static Plug sk_tcp_plug (Socket sock, Plug p) { |
306 | Actual_Socket s = (Actual_Socket) sock; |
307 | Plug ret = s->plug; |
308 | if (p) s->plug = p; |
309 | return ret; |
310 | } |
311 | |
312 | static void sk_tcp_flush (Socket s) { |
313 | /* |
314 | * We send data to the socket as soon as we can anyway, |
315 | * so we don't need to do anything here. :-) |
316 | */ |
317 | } |
318 | |
319 | void sk_tcp_close (Socket s); |
320 | void sk_tcp_write (Socket s, char *data, int len); |
321 | void sk_tcp_write_oob (Socket s, char *data, int len); |
322 | char *sk_tcp_socket_error(Socket s); |
323 | |
4b1e8acc |
324 | Socket sk_new(SockAddr addr, int port, int privport, int oobinline, |
7e78000d |
325 | Plug plug) |
326 | { |
327 | static struct socket_function_table fn_table = { |
328 | sk_tcp_plug, |
329 | sk_tcp_close, |
330 | sk_tcp_write, |
331 | sk_tcp_write_oob, |
332 | sk_tcp_flush, |
333 | sk_tcp_socket_error |
334 | }; |
335 | |
2f75bae1 |
336 | SOCKET s; |
c4d8e107 |
337 | #ifdef IPV6 |
338 | SOCKADDR_IN6 a6; |
339 | #endif |
2f75bae1 |
340 | SOCKADDR_IN a; |
341 | DWORD err; |
342 | char *errstr; |
7e78000d |
343 | Actual_Socket ret; |
2f75bae1 |
344 | extern char *do_select(SOCKET skt, int startup); |
c91409da |
345 | short localport; |
2f75bae1 |
346 | |
347 | /* |
348 | * Create Socket structure. |
349 | */ |
350 | ret = smalloc(sizeof(struct Socket_tag)); |
7e78000d |
351 | ret->fn = &fn_table; |
2f75bae1 |
352 | ret->error = NULL; |
7e78000d |
353 | ret->plug = plug; |
2f75bae1 |
354 | ret->head = ret->tail = NULL; |
355 | ret->writable = 1; /* to start with */ |
33232c8f |
356 | ret->sending_oob = 0; |
2f75bae1 |
357 | |
358 | /* |
359 | * Open socket. |
360 | */ |
c4d8e107 |
361 | s = socket(addr->family, SOCK_STREAM, 0); |
2f75bae1 |
362 | ret->s = s; |
363 | |
364 | if (s == INVALID_SOCKET) { |
365 | err = WSAGetLastError(); |
e74fbad9 |
366 | ret->error = winsock_error_string(err); |
7e78000d |
367 | return (Socket) ret; |
2f75bae1 |
368 | } |
4b1e8acc |
369 | |
370 | ret->oobinline = oobinline; |
371 | if (oobinline) { |
1ad4eb6f |
372 | BOOL b = TRUE; |
373 | setsockopt (s, SOL_SOCKET, SO_OOBINLINE, (void *)&b, sizeof(b)); |
374 | } |
2f75bae1 |
375 | |
376 | /* |
377 | * Bind to local address. |
378 | */ |
c91409da |
379 | if (privport) |
380 | localport = 1023; /* count from 1023 downwards */ |
c4d8e107 |
381 | else |
c91409da |
382 | localport = 0; /* just use port 0 (ie winsock picks) */ |
383 | |
384 | /* Loop round trying to bind */ |
385 | while (1) { |
386 | int retcode; |
387 | |
388 | #ifdef IPV6 |
389 | if (addr->family == AF_INET6) |
390 | { |
391 | memset(&a6,0,sizeof(a6)); |
392 | a6.sin6_family = AF_INET6; |
393 | /*a6.sin6_addr = in6addr_any;*/ /* == 0 */ |
394 | a6.sin6_port = htons(localport); |
395 | } |
396 | else |
397 | { |
c4d8e107 |
398 | #endif |
c91409da |
399 | a.sin_family = AF_INET; |
400 | a.sin_addr.s_addr = htonl(INADDR_ANY); |
401 | a.sin_port = htons(localport); |
c4d8e107 |
402 | #ifdef IPV6 |
c91409da |
403 | } |
404 | retcode = bind (s, (addr->family == AF_INET6 ? |
405 | (struct sockaddr *)&a6 : |
406 | (struct sockaddr *)&a), |
407 | (addr->family == AF_INET6 ? sizeof(a6) : sizeof(a))); |
c4d8e107 |
408 | #else |
c91409da |
409 | retcode = bind (s, (struct sockaddr *)&a, sizeof(a)); |
c4d8e107 |
410 | #endif |
c91409da |
411 | if (retcode != SOCKET_ERROR) { |
412 | err = 0; |
413 | break; /* done */ |
414 | } else { |
415 | err = WSAGetLastError(); |
416 | if (err != WSAEADDRINUSE) /* failed, for a bad reason */ |
417 | break; |
418 | } |
419 | |
420 | if (localport == 0) |
421 | break; /* we're only looping once */ |
422 | localport--; |
423 | if (localport == 0) |
424 | break; /* we might have got to the end */ |
425 | } |
426 | |
427 | if (err) |
c4d8e107 |
428 | { |
c4d8e107 |
429 | ret->error = winsock_error_string(err); |
7e78000d |
430 | return (Socket) ret; |
2f75bae1 |
431 | } |
432 | |
433 | /* |
434 | * Connect to remote address. |
435 | */ |
c4d8e107 |
436 | #ifdef IPV6 |
437 | if (addr->family == AF_INET6) |
438 | { |
439 | memset(&a,0,sizeof(a)); |
440 | a6.sin6_family = AF_INET6; |
441 | a6.sin6_port = htons((short)port); |
442 | a6.sin6_addr = ((struct sockaddr_in6 *)addr->ai->ai_addr)->sin6_addr; |
443 | } |
444 | else |
445 | { |
446 | #endif |
447 | a.sin_family = AF_INET; |
448 | a.sin_addr.s_addr = htonl(addr->address); |
449 | a.sin_port = htons((short)port); |
450 | #ifdef IPV6 |
451 | } |
452 | if (connect (s, (addr->family == AF_INET6) ? (struct sockaddr *)&a6 : (struct sockaddr *)&a, (addr->family == AF_INET6) ? sizeof(a6) : sizeof(a)) == SOCKET_ERROR) |
453 | #else |
454 | if (connect (s, (struct sockaddr *)&a, sizeof(a)) == SOCKET_ERROR) |
455 | #endif |
456 | { |
2f75bae1 |
457 | err = WSAGetLastError(); |
c4d8e107 |
458 | ret->error = winsock_error_string(err); |
7e78000d |
459 | return (Socket) ret; |
2f75bae1 |
460 | } |
461 | |
462 | /* Set up a select mechanism. This could be an AsyncSelect on a |
463 | * window, or an EventSelect on an event object. */ |
464 | errstr = do_select(s, 1); |
465 | if (errstr) { |
466 | ret->error = errstr; |
7e78000d |
467 | return (Socket) ret; |
2f75bae1 |
468 | } |
469 | |
470 | add234(sktree, ret); |
471 | |
7e78000d |
472 | return (Socket) ret; |
2f75bae1 |
473 | } |
474 | |
7e78000d |
475 | static void sk_tcp_close(Socket sock) { |
9c964e85 |
476 | extern char *do_select(SOCKET skt, int startup); |
7e78000d |
477 | Actual_Socket s = (Actual_Socket) sock; |
9c964e85 |
478 | |
2f75bae1 |
479 | del234(sktree, s); |
480 | do_select(s->s, 0); |
481 | closesocket(s->s); |
dcbde236 |
482 | sfree(s); |
2f75bae1 |
483 | } |
484 | |
2f75bae1 |
485 | /* |
486 | * The function which tries to send on a socket once it's deemed |
487 | * writable. |
488 | */ |
7e78000d |
489 | void try_send(Actual_Socket s) { |
2f75bae1 |
490 | while (s->head) { |
491 | int nsent; |
492 | DWORD err; |
493 | int len, urgentflag; |
494 | |
495 | if (s->sending_oob) { |
496 | urgentflag = MSG_OOB; |
497 | len = s->sending_oob; |
498 | } else { |
499 | urgentflag = 0; |
500 | len = s->head->buflen - s->head->bufpos; |
501 | } |
502 | |
503 | nsent = send(s->s, s->head->buf + s->head->bufpos, len, urgentflag); |
7d6ee6ff |
504 | noise_ultralight(nsent); |
2f75bae1 |
505 | if (nsent <= 0) { |
506 | err = (nsent < 0 ? WSAGetLastError() : 0); |
d40a94b9 |
507 | if ((err==0 && nsent < 0) || err == WSAEWOULDBLOCK) { |
508 | /* |
509 | * Perfectly normal: we've sent all we can for the moment. |
510 | * |
511 | * (Apparently some WinSocks can return <0 but |
512 | * leave no error indication - WSAGetLastError() is |
513 | * called but returns zero - so we check that case |
514 | * and treat it just like WSAEWOULDBLOCK.) |
515 | */ |
2f75bae1 |
516 | s->writable = FALSE; |
517 | return; |
518 | } else if (nsent == 0 || |
519 | err == WSAECONNABORTED || |
520 | err == WSAECONNRESET) { |
521 | /* |
522 | * FIXME. This will have to be done better when we |
523 | * start managing multiple sockets (e.g. SSH port |
524 | * forwarding), because if we get CONNRESET while |
525 | * trying to write a particular forwarded socket |
526 | * then it isn't necessarily the end of the world. |
527 | * Ideally I'd like to pass the error code back to |
528 | * somewhere the next select_result() will see it, |
529 | * but that might be hard. Perhaps I should pass it |
530 | * back to be queued in the Windows front end bit. |
531 | */ |
532 | fatalbox(winsock_error_string(err)); |
533 | } else { |
534 | fatalbox(winsock_error_string(err)); |
535 | } |
536 | } else { |
537 | s->head->bufpos += nsent; |
538 | if (s->sending_oob) |
539 | s->sending_oob -= nsent; |
540 | if (s->head->bufpos >= s->head->buflen) { |
541 | struct buffer *tmp = s->head; |
542 | s->head = tmp->next; |
dcbde236 |
543 | sfree(tmp); |
2f75bae1 |
544 | if (!s->head) |
545 | s->tail = NULL; |
546 | } |
547 | } |
548 | } |
549 | } |
550 | |
7e78000d |
551 | static void sk_tcp_write(Socket sock, char *buf, int len) { |
552 | Actual_Socket s = (Actual_Socket) sock; |
553 | |
2f75bae1 |
554 | /* |
555 | * Add the data to the buffer list on the socket. |
556 | */ |
557 | if (s->tail && s->tail->buflen < BUFFER_GRANULE) { |
558 | int copylen = min(len, BUFFER_GRANULE - s->tail->buflen); |
559 | memcpy(s->tail->buf + s->tail->buflen, buf, copylen); |
560 | buf += copylen; |
561 | len -= copylen; |
562 | s->tail->buflen += copylen; |
563 | } |
564 | while (len > 0) { |
565 | int grainlen = min(len, BUFFER_GRANULE); |
566 | struct buffer *newbuf; |
567 | newbuf = smalloc(sizeof(struct buffer)); |
568 | newbuf->bufpos = 0; |
569 | newbuf->buflen = grainlen; |
570 | memcpy(newbuf->buf, buf, grainlen); |
571 | buf += grainlen; |
572 | len -= grainlen; |
573 | if (s->tail) |
574 | s->tail->next = newbuf; |
575 | else |
576 | s->head = s->tail = newbuf; |
577 | newbuf->next = NULL; |
578 | s->tail = newbuf; |
579 | } |
580 | |
581 | /* |
582 | * Now try sending from the start of the buffer list. |
583 | */ |
584 | if (s->writable) |
585 | try_send(s); |
586 | } |
587 | |
7e78000d |
588 | static void sk_tcp_write_oob(Socket sock, char *buf, int len) { |
589 | Actual_Socket s = (Actual_Socket) sock; |
590 | |
2f75bae1 |
591 | /* |
592 | * Replace the buffer list on the socket with the data. |
593 | */ |
594 | if (!s->head) { |
595 | s->head = smalloc(sizeof(struct buffer)); |
596 | } else { |
597 | struct buffer *walk = s->head->next; |
598 | while (walk) { |
599 | struct buffer *tmp = walk; |
600 | walk = tmp->next; |
dcbde236 |
601 | sfree(tmp); |
2f75bae1 |
602 | } |
603 | } |
604 | s->head->next = NULL; |
605 | s->tail = s->head; |
606 | s->head->buflen = len; |
607 | memcpy(s->head->buf, buf, len); |
608 | |
609 | /* |
610 | * Set the Urgent marker. |
611 | */ |
612 | s->sending_oob = len; |
613 | |
614 | /* |
615 | * Now try sending from the start of the buffer list. |
616 | */ |
617 | if (s->writable) |
618 | try_send(s); |
619 | } |
620 | |
621 | int select_result(WPARAM wParam, LPARAM lParam) { |
f9d3f227 |
622 | int ret, open; |
2f75bae1 |
623 | DWORD err; |
b675c612 |
624 | char buf[20480]; /* nice big buffer for plenty of speed */ |
7e78000d |
625 | Actual_Socket s; |
49bad831 |
626 | u_long atmark; |
2f75bae1 |
627 | |
628 | /* wParam is the socket itself */ |
629 | s = find234(sktree, (void *)wParam, cmpforsearch); |
630 | if (!s) |
631 | return 1; /* boggle */ |
632 | |
633 | if ((err = WSAGETSELECTERROR(lParam)) != 0) { |
2c94fd1c |
634 | /* |
635 | * An error has occurred on this socket. Pass it to the |
7e78000d |
636 | * plug. |
2c94fd1c |
637 | */ |
7e78000d |
638 | return plug_closing (s->plug, winsock_error_string(err), err, 0); |
2f75bae1 |
639 | } |
640 | |
7d6ee6ff |
641 | noise_ultralight(lParam); |
642 | |
2f75bae1 |
643 | switch (WSAGETSELECTEVENT(lParam)) { |
644 | case FD_READ: |
4b1e8acc |
645 | /* |
646 | * We have received data on the socket. For an oobinline |
647 | * socket, this might be data _before_ an urgent pointer, |
648 | * in which case we send it to the back end with type==1 |
649 | * (data prior to urgent). |
650 | */ |
651 | if (s->oobinline) { |
652 | atmark = 1; |
653 | ioctlsocket(s->s, SIOCATMARK, &atmark); |
654 | /* |
655 | * Avoid checking the return value from ioctlsocket(), |
656 | * on the grounds that some WinSock wrappers don't |
657 | * support it. If it does nothing, we get atmark==1, |
658 | * which is equivalent to `no OOB pending', so the |
659 | * effect will be to non-OOB-ify any OOB data. |
660 | */ |
661 | } else |
662 | atmark = 1; |
663 | |
2f75bae1 |
664 | ret = recv(s->s, buf, sizeof(buf), 0); |
4b1e8acc |
665 | noise_ultralight(ret); |
2f75bae1 |
666 | if (ret < 0) { |
667 | err = WSAGetLastError(); |
668 | if (err == WSAEWOULDBLOCK) { |
669 | break; |
670 | } |
671 | } |
672 | if (ret < 0) { |
7e78000d |
673 | return plug_closing (s->plug, winsock_error_string(err), err, 0); |
674 | } else if (0 == ret) { |
675 | return plug_closing (s->plug, NULL, 0, 0); |
2f75bae1 |
676 | } else { |
7e78000d |
677 | return plug_receive (s->plug, atmark ? 0 : 1, buf, ret); |
2f75bae1 |
678 | } |
679 | break; |
680 | case FD_OOB: |
4b1e8acc |
681 | /* |
682 | * This will only happen on a non-oobinline socket. It |
683 | * indicates that we can immediately perform an OOB read |
684 | * and get back OOB data, which we will send to the back |
685 | * end with type==2 (urgent data). |
686 | */ |
2f75bae1 |
687 | ret = recv(s->s, buf, sizeof(buf), MSG_OOB); |
7d6ee6ff |
688 | noise_ultralight(ret); |
2f75bae1 |
689 | if (ret <= 0) { |
690 | fatalbox(ret == 0 ? "Internal networking trouble" : |
691 | winsock_error_string(WSAGetLastError())); |
692 | } else { |
7e78000d |
693 | return plug_receive (s->plug, 2, buf, ret); |
2f75bae1 |
694 | } |
695 | break; |
696 | case FD_WRITE: |
697 | s->writable = 1; |
698 | try_send(s); |
699 | break; |
700 | case FD_CLOSE: |
f9d3f227 |
701 | /* Signal a close on the socket. First read any outstanding data. */ |
702 | open = 1; |
703 | do { |
704 | ret = recv(s->s, buf, sizeof(buf), 0); |
705 | if (ret < 0) { |
706 | err = WSAGetLastError(); |
707 | if (err == WSAEWOULDBLOCK) |
708 | break; |
7e78000d |
709 | return plug_closing (s->plug, winsock_error_string(err), err, 0); |
710 | } else { |
711 | if (ret) open &= plug_receive (s->plug, 0, buf, ret); |
712 | else open &= plug_closing (s->plug, NULL, 0, 0); |
713 | } |
f9d3f227 |
714 | } while (ret > 0); |
715 | return open; |
2f75bae1 |
716 | } |
717 | |
718 | return 1; |
719 | } |
720 | |
721 | /* |
722 | * Each socket abstraction contains a `void *' private field in |
723 | * which the client can keep state. |
724 | */ |
7e78000d |
725 | void sk_set_private_ptr(Socket sock, void *ptr) { |
726 | Actual_Socket s = (Actual_Socket) sock; |
2f75bae1 |
727 | s->private_ptr = ptr; |
728 | } |
7e78000d |
729 | void *sk_get_private_ptr(Socket sock) { |
730 | Actual_Socket s = (Actual_Socket) sock; |
2f75bae1 |
731 | return s->private_ptr; |
732 | } |
733 | |
734 | /* |
735 | * Special error values are returned from sk_namelookup and sk_new |
736 | * if there's a problem. These functions extract an error message, |
737 | * or return NULL if there's no problem. |
738 | */ |
739 | char *sk_addr_error(SockAddr addr) { |
740 | return addr->error; |
741 | } |
7e78000d |
742 | static char *sk_tcp_socket_error(Socket sock) { |
743 | Actual_Socket s = (Actual_Socket) sock; |
2f75bae1 |
744 | return s->error; |
745 | } |
746 | |
747 | /* |
748 | * For Plink: enumerate all sockets currently active. |
749 | */ |
d2371c81 |
750 | SOCKET first_socket(int *state) { |
751 | Actual_Socket s; |
752 | *state = 0; |
753 | s = index234(sktree, (*state)++); |
2f75bae1 |
754 | return s ? s->s : INVALID_SOCKET; |
755 | } |
d2371c81 |
756 | SOCKET next_socket(int *state) { |
757 | Actual_Socket s = index234(sktree, (*state)++); |
2f75bae1 |
758 | return s ? s->s : INVALID_SOCKET; |
759 | } |