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. */ |
32874aea |
85 | int family; |
c4d8e107 |
86 | unsigned long address; /* Address IPv4 style. */ |
87 | #ifdef IPV6 |
88 | struct addrinfo *ai; /* Address IPv6 style. */ |
89 | #endif |
2f75bae1 |
90 | }; |
91 | |
92 | struct buffer { |
93 | struct buffer *next; |
94 | int buflen, bufpos; |
95 | char buf[BUFFER_GRANULE]; |
96 | }; |
97 | |
98 | static tree234 *sktree; |
99 | |
32874aea |
100 | static int cmpfortree(void *av, void *bv) |
101 | { |
102 | Actual_Socket a = (Actual_Socket) av, b = (Actual_Socket) bv; |
103 | unsigned long as = (unsigned long) a->s, bs = (unsigned long) b->s; |
104 | if (as < bs) |
105 | return -1; |
106 | if (as > bs) |
107 | return +1; |
2f75bae1 |
108 | return 0; |
109 | } |
110 | |
32874aea |
111 | static int cmpforsearch(void *av, void *bv) |
112 | { |
113 | Actual_Socket b = (Actual_Socket) bv; |
114 | unsigned long as = (unsigned long) av, bs = (unsigned long) b->s; |
115 | if (as < bs) |
116 | return -1; |
117 | if (as > bs) |
118 | return +1; |
2f75bae1 |
119 | return 0; |
120 | } |
121 | |
32874aea |
122 | void sk_init(void) |
123 | { |
2f75bae1 |
124 | sktree = newtree234(cmpfortree); |
125 | } |
126 | |
32874aea |
127 | char *winsock_error_string(int error) |
128 | { |
e74fbad9 |
129 | switch (error) { |
32874aea |
130 | case WSAEACCES: |
131 | return "Network error: Permission denied"; |
132 | case WSAEADDRINUSE: |
133 | return "Network error: Address already in use"; |
134 | case WSAEADDRNOTAVAIL: |
135 | return "Network error: Cannot assign requested address"; |
136 | case WSAEAFNOSUPPORT: |
137 | return |
138 | "Network error: Address family not supported by protocol family"; |
139 | case WSAEALREADY: |
140 | return "Network error: Operation already in progress"; |
141 | case WSAECONNABORTED: |
142 | return "Network error: Software caused connection abort"; |
143 | case WSAECONNREFUSED: |
144 | return "Network error: Connection refused"; |
145 | case WSAECONNRESET: |
146 | return "Network error: Connection reset by peer"; |
147 | case WSAEDESTADDRREQ: |
148 | return "Network error: Destination address required"; |
149 | case WSAEFAULT: |
150 | return "Network error: Bad address"; |
151 | case WSAEHOSTDOWN: |
152 | return "Network error: Host is down"; |
153 | case WSAEHOSTUNREACH: |
154 | return "Network error: No route to host"; |
155 | case WSAEINPROGRESS: |
156 | return "Network error: Operation now in progress"; |
157 | case WSAEINTR: |
158 | return "Network error: Interrupted function call"; |
159 | case WSAEINVAL: |
160 | return "Network error: Invalid argument"; |
161 | case WSAEISCONN: |
162 | return "Network error: Socket is already connected"; |
163 | case WSAEMFILE: |
164 | return "Network error: Too many open files"; |
165 | case WSAEMSGSIZE: |
166 | return "Network error: Message too long"; |
167 | case WSAENETDOWN: |
168 | return "Network error: Network is down"; |
169 | case WSAENETRESET: |
170 | return "Network error: Network dropped connection on reset"; |
171 | case WSAENETUNREACH: |
172 | return "Network error: Network is unreachable"; |
173 | case WSAENOBUFS: |
174 | return "Network error: No buffer space available"; |
175 | case WSAENOPROTOOPT: |
176 | return "Network error: Bad protocol option"; |
177 | case WSAENOTCONN: |
178 | return "Network error: Socket is not connected"; |
179 | case WSAENOTSOCK: |
180 | return "Network error: Socket operation on non-socket"; |
181 | case WSAEOPNOTSUPP: |
182 | return "Network error: Operation not supported"; |
183 | case WSAEPFNOSUPPORT: |
184 | return "Network error: Protocol family not supported"; |
185 | case WSAEPROCLIM: |
186 | return "Network error: Too many processes"; |
187 | case WSAEPROTONOSUPPORT: |
188 | return "Network error: Protocol not supported"; |
189 | case WSAEPROTOTYPE: |
190 | return "Network error: Protocol wrong type for socket"; |
191 | case WSAESHUTDOWN: |
192 | return "Network error: Cannot send after socket shutdown"; |
193 | case WSAESOCKTNOSUPPORT: |
194 | return "Network error: Socket type not supported"; |
195 | case WSAETIMEDOUT: |
196 | return "Network error: Connection timed out"; |
197 | case WSAEWOULDBLOCK: |
198 | return "Network error: Resource temporarily unavailable"; |
199 | case WSAEDISCON: |
200 | return "Network error: Graceful shutdown in progress"; |
201 | default: |
202 | return "Unknown network error"; |
e74fbad9 |
203 | } |
204 | } |
205 | |
c4d8e107 |
206 | SockAddr sk_namelookup(char *host, char **canonicalname) |
207 | { |
2f75bae1 |
208 | SockAddr ret = smalloc(sizeof(struct SockAddr_tag)); |
209 | unsigned long a; |
c4d8e107 |
210 | struct hostent *h = NULL; |
6e1ebb76 |
211 | char realhost[8192]; |
2f75bae1 |
212 | |
c4d8e107 |
213 | /* Clear the structure and default to IPv4. */ |
214 | memset(ret, 0, sizeof(struct SockAddr_tag)); |
215 | ret->family = 0; /* We set this one when we have resolved the host. */ |
6e1ebb76 |
216 | *realhost = '\0'; |
c4d8e107 |
217 | |
32874aea |
218 | if ((a = inet_addr(host)) == (unsigned long) INADDR_NONE) { |
c4d8e107 |
219 | #ifdef IPV6 |
220 | |
221 | /* Try to get the getaddrinfo() function from wship6.dll */ |
222 | /* This way one doesn't need to have IPv6 dll's to use PuTTY and |
223 | * it will fallback to IPv4. */ |
32874aea |
224 | typedef int (CALLBACK * FGETADDRINFO) (const char *nodename, |
225 | const char *servname, |
226 | const struct addrinfo * |
227 | hints, |
228 | struct addrinfo ** res); |
c4d8e107 |
229 | FGETADDRINFO fGetAddrInfo = NULL; |
230 | |
231 | HINSTANCE dllWSHIP6 = LoadLibrary("wship6.dll"); |
232 | if (dllWSHIP6) |
32874aea |
233 | fGetAddrInfo = (FGETADDRINFO) GetProcAddress(dllWSHIP6, |
234 | "getaddrinfo"); |
c4d8e107 |
235 | |
236 | /* |
237 | * Use fGetAddrInfo when it's available (which usually also |
238 | * means IPv6 is installed...) |
239 | */ |
32874aea |
240 | if (fGetAddrInfo) { |
c4d8e107 |
241 | /*debug(("Resolving \"%s\" with getaddrinfo() (IPv4+IPv6 capable)...\n", host)); */ |
242 | if (fGetAddrInfo(host, NULL, NULL, &ret->ai) == 0) |
243 | ret->family = ret->ai->ai_family; |
32874aea |
244 | } else |
c4d8e107 |
245 | #endif |
32874aea |
246 | { |
c4d8e107 |
247 | /* |
248 | * Otherwise use the IPv4-only gethostbyname... |
249 | * (NOTE: we don't use gethostbyname as a |
250 | * fallback!) |
251 | */ |
32874aea |
252 | if (ret->family == 0) { |
253 | /*debug(("Resolving \"%s\" with gethostbyname() (IPv4 only)...\n", host)); */ |
2d466ffd |
254 | if ( (h = gethostbyname(host)) ) |
32874aea |
255 | ret->family = AF_INET; |
256 | } |
c4d8e107 |
257 | } |
258 | /*debug(("Done resolving...(family is %d) AF_INET = %d, AF_INET6 = %d\n", ret->family, AF_INET, AF_INET6)); */ |
259 | |
32874aea |
260 | if (ret->family == 0) { |
2f75bae1 |
261 | DWORD err = WSAGetLastError(); |
c4d8e107 |
262 | ret->error = (err == WSAENETDOWN ? "Network is down" : |
32874aea |
263 | err == |
264 | WSAHOST_NOT_FOUND ? "Host does not exist" : err |
265 | == WSATRY_AGAIN ? "Host not found" : |
c4d8e107 |
266 | #ifdef IPV6 |
267 | fGetAddrInfo ? "getaddrinfo: unknown error" : |
268 | #endif |
269 | "gethostbyname: unknown error"); |
270 | #ifdef DEBUG |
271 | { |
272 | LPVOID lpMsgBuf; |
32874aea |
273 | FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | |
274 | FORMAT_MESSAGE_FROM_SYSTEM | |
275 | FORMAT_MESSAGE_IGNORE_INSERTS, NULL, err, |
276 | MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), |
277 | (LPTSTR) & lpMsgBuf, 0, NULL); |
278 | /*debug(("Error %ld: %s (h=%lx)\n", err, lpMsgBuf, h)); */ |
c4d8e107 |
279 | /* Free the buffer. */ |
280 | LocalFree(lpMsgBuf); |
281 | } |
282 | #endif |
32874aea |
283 | } else { |
c4d8e107 |
284 | ret->error = NULL; |
285 | |
286 | #ifdef IPV6 |
287 | /* If we got an address info use that... */ |
32874aea |
288 | if (ret->ai) { |
289 | typedef int (CALLBACK * FGETNAMEINFO) |
290 | (const struct sockaddr FAR * sa, socklen_t salen, |
291 | char FAR * host, size_t hostlen, char FAR * serv, |
292 | size_t servlen, int flags); |
c4d8e107 |
293 | FGETNAMEINFO fGetNameInfo = NULL; |
294 | |
295 | /* Are we in IPv4 fallback mode? */ |
296 | /* We put the IPv4 address into the a variable so we can further-on use the IPv4 code... */ |
297 | if (ret->family == AF_INET) |
32874aea |
298 | memcpy(&a, |
299 | (char *) &((SOCKADDR_IN *) ret->ai-> |
300 | ai_addr)->sin_addr, sizeof(a)); |
c4d8e107 |
301 | |
302 | /* Now let's find that canonicalname... */ |
32874aea |
303 | if ((dllWSHIP6) |
304 | && (fGetNameInfo = |
305 | (FGETNAMEINFO) GetProcAddress(dllWSHIP6, |
306 | "getnameinfo"))) { |
307 | if (fGetNameInfo |
308 | ((struct sockaddr *) ret->ai->ai_addr, |
309 | ret->family == |
310 | AF_INET ? sizeof(SOCKADDR_IN) : |
6e1ebb76 |
311 | sizeof(SOCKADDR_IN6), realhost, |
312 | sizeof(realhost), NULL, 0, 0) != 0) { |
313 | strncpy(realhost, host, sizeof(realhost)); |
c4d8e107 |
314 | } |
315 | } |
316 | } |
317 | /* We used the IPv4-only gethostbyname()... */ |
318 | else |
c4d8e107 |
319 | #endif |
32874aea |
320 | { |
c4d8e107 |
321 | memcpy(&a, h->h_addr, sizeof(a)); |
322 | /* This way we are always sure the h->h_name is valid :) */ |
6e1ebb76 |
323 | strncpy(realhost, h->h_name, sizeof(realhost)); |
c4d8e107 |
324 | } |
c4d8e107 |
325 | } |
326 | #ifdef IPV6 |
327 | FreeLibrary(dllWSHIP6); |
328 | #endif |
32874aea |
329 | } else { |
87ed061f |
330 | /* |
331 | * This must be a numeric IPv4 address because it caused a |
332 | * success return from inet_addr. |
333 | */ |
32874aea |
334 | ret->family = AF_INET; |
6e1ebb76 |
335 | strncpy(realhost, host, sizeof(realhost)); |
2f75bae1 |
336 | } |
337 | ret->address = ntohl(a); |
6e1ebb76 |
338 | realhost[lenof(realhost)-1] = '\0'; |
339 | *canonicalname = smalloc(1+strlen(realhost)); |
340 | strcpy(*canonicalname, realhost); |
2f75bae1 |
341 | return ret; |
342 | } |
343 | |
32874aea |
344 | void sk_addr_free(SockAddr addr) |
345 | { |
2f75bae1 |
346 | sfree(addr); |
347 | } |
348 | |
32874aea |
349 | static Plug sk_tcp_plug(Socket sock, Plug p) |
350 | { |
7e78000d |
351 | Actual_Socket s = (Actual_Socket) sock; |
352 | Plug ret = s->plug; |
32874aea |
353 | if (p) |
354 | s->plug = p; |
7e78000d |
355 | return ret; |
356 | } |
357 | |
32874aea |
358 | static void sk_tcp_flush(Socket s) |
359 | { |
7e78000d |
360 | /* |
361 | * We send data to the socket as soon as we can anyway, |
362 | * so we don't need to do anything here. :-) |
363 | */ |
364 | } |
365 | |
2d466ffd |
366 | static void sk_tcp_close(Socket s); |
367 | static void sk_tcp_write(Socket s, char *data, int len); |
368 | static void sk_tcp_write_oob(Socket s, char *data, int len); |
369 | static char *sk_tcp_socket_error(Socket s); |
7e78000d |
370 | |
4b1e8acc |
371 | Socket sk_new(SockAddr addr, int port, int privport, int oobinline, |
32874aea |
372 | Plug plug) |
7e78000d |
373 | { |
374 | static struct socket_function_table fn_table = { |
375 | sk_tcp_plug, |
376 | sk_tcp_close, |
377 | sk_tcp_write, |
378 | sk_tcp_write_oob, |
379 | sk_tcp_flush, |
380 | sk_tcp_socket_error |
381 | }; |
382 | |
2f75bae1 |
383 | SOCKET s; |
c4d8e107 |
384 | #ifdef IPV6 |
385 | SOCKADDR_IN6 a6; |
386 | #endif |
2f75bae1 |
387 | SOCKADDR_IN a; |
388 | DWORD err; |
389 | char *errstr; |
7e78000d |
390 | Actual_Socket ret; |
2f75bae1 |
391 | extern char *do_select(SOCKET skt, int startup); |
c91409da |
392 | short localport; |
2f75bae1 |
393 | |
394 | /* |
395 | * Create Socket structure. |
396 | */ |
397 | ret = smalloc(sizeof(struct Socket_tag)); |
7e78000d |
398 | ret->fn = &fn_table; |
2f75bae1 |
399 | ret->error = NULL; |
7e78000d |
400 | ret->plug = plug; |
2f75bae1 |
401 | ret->head = ret->tail = NULL; |
402 | ret->writable = 1; /* to start with */ |
33232c8f |
403 | ret->sending_oob = 0; |
2f75bae1 |
404 | |
405 | /* |
406 | * Open socket. |
407 | */ |
c4d8e107 |
408 | s = socket(addr->family, SOCK_STREAM, 0); |
2f75bae1 |
409 | ret->s = s; |
410 | |
411 | if (s == INVALID_SOCKET) { |
412 | err = WSAGetLastError(); |
32874aea |
413 | ret->error = winsock_error_string(err); |
7e78000d |
414 | return (Socket) ret; |
2f75bae1 |
415 | } |
4b1e8acc |
416 | |
417 | ret->oobinline = oobinline; |
418 | if (oobinline) { |
1ad4eb6f |
419 | BOOL b = TRUE; |
32874aea |
420 | setsockopt(s, SOL_SOCKET, SO_OOBINLINE, (void *) &b, sizeof(b)); |
1ad4eb6f |
421 | } |
2f75bae1 |
422 | |
423 | /* |
424 | * Bind to local address. |
425 | */ |
c91409da |
426 | if (privport) |
32874aea |
427 | localport = 1023; /* count from 1023 downwards */ |
c4d8e107 |
428 | else |
32874aea |
429 | localport = 0; /* just use port 0 (ie winsock picks) */ |
c91409da |
430 | |
431 | /* Loop round trying to bind */ |
432 | while (1) { |
32874aea |
433 | int retcode; |
c91409da |
434 | |
435 | #ifdef IPV6 |
32874aea |
436 | if (addr->family == AF_INET6) { |
437 | memset(&a6, 0, sizeof(a6)); |
438 | a6.sin6_family = AF_INET6; |
439 | /*a6.sin6_addr = in6addr_any; *//* == 0 */ |
440 | a6.sin6_port = htons(localport); |
441 | } else |
c4d8e107 |
442 | #endif |
32874aea |
443 | { |
444 | a.sin_family = AF_INET; |
445 | a.sin_addr.s_addr = htonl(INADDR_ANY); |
446 | a.sin_port = htons(localport); |
447 | } |
c4d8e107 |
448 | #ifdef IPV6 |
32874aea |
449 | retcode = bind(s, (addr->family == AF_INET6 ? |
450 | (struct sockaddr *) &a6 : |
451 | (struct sockaddr *) &a), |
452 | (addr->family == |
453 | AF_INET6 ? sizeof(a6) : sizeof(a))); |
c4d8e107 |
454 | #else |
32874aea |
455 | retcode = bind(s, (struct sockaddr *) &a, sizeof(a)); |
c4d8e107 |
456 | #endif |
32874aea |
457 | if (retcode != SOCKET_ERROR) { |
458 | err = 0; |
459 | break; /* done */ |
460 | } else { |
461 | err = WSAGetLastError(); |
462 | if (err != WSAEADDRINUSE) /* failed, for a bad reason */ |
463 | break; |
464 | } |
465 | |
466 | if (localport == 0) |
467 | break; /* we're only looping once */ |
468 | localport--; |
469 | if (localport == 0) |
470 | break; /* we might have got to the end */ |
c91409da |
471 | } |
472 | |
32874aea |
473 | if (err) { |
c4d8e107 |
474 | ret->error = winsock_error_string(err); |
7e78000d |
475 | return (Socket) ret; |
2f75bae1 |
476 | } |
477 | |
478 | /* |
479 | * Connect to remote address. |
480 | */ |
c4d8e107 |
481 | #ifdef IPV6 |
32874aea |
482 | if (addr->family == AF_INET6) { |
483 | memset(&a, 0, sizeof(a)); |
c4d8e107 |
484 | a6.sin6_family = AF_INET6; |
32874aea |
485 | a6.sin6_port = htons((short) port); |
486 | a6.sin6_addr = |
487 | ((struct sockaddr_in6 *) addr->ai->ai_addr)->sin6_addr; |
488 | } else |
c4d8e107 |
489 | #endif |
32874aea |
490 | { |
c4d8e107 |
491 | a.sin_family = AF_INET; |
492 | a.sin_addr.s_addr = htonl(addr->address); |
32874aea |
493 | a.sin_port = htons((short) port); |
c4d8e107 |
494 | } |
32874aea |
495 | if (( |
496 | #ifdef IPV6 |
497 | connect(s, ((addr->family == AF_INET6) ? |
498 | (struct sockaddr *) &a6 : (struct sockaddr *) &a), |
499 | (addr->family == AF_INET6) ? sizeof(a6) : sizeof(a)) |
c4d8e107 |
500 | #else |
32874aea |
501 | connect(s, (struct sockaddr *) &a, sizeof(a)) |
c4d8e107 |
502 | #endif |
32874aea |
503 | ) == SOCKET_ERROR) { |
2f75bae1 |
504 | err = WSAGetLastError(); |
c4d8e107 |
505 | ret->error = winsock_error_string(err); |
7e78000d |
506 | return (Socket) ret; |
2f75bae1 |
507 | } |
508 | |
509 | /* Set up a select mechanism. This could be an AsyncSelect on a |
510 | * window, or an EventSelect on an event object. */ |
511 | errstr = do_select(s, 1); |
512 | if (errstr) { |
513 | ret->error = errstr; |
7e78000d |
514 | return (Socket) ret; |
2f75bae1 |
515 | } |
516 | |
517 | add234(sktree, ret); |
518 | |
7e78000d |
519 | return (Socket) ret; |
2f75bae1 |
520 | } |
521 | |
32874aea |
522 | static void sk_tcp_close(Socket sock) |
523 | { |
9c964e85 |
524 | extern char *do_select(SOCKET skt, int startup); |
7e78000d |
525 | Actual_Socket s = (Actual_Socket) sock; |
9c964e85 |
526 | |
2f75bae1 |
527 | del234(sktree, s); |
528 | do_select(s->s, 0); |
529 | closesocket(s->s); |
dcbde236 |
530 | sfree(s); |
2f75bae1 |
531 | } |
532 | |
2f75bae1 |
533 | /* |
534 | * The function which tries to send on a socket once it's deemed |
535 | * writable. |
536 | */ |
32874aea |
537 | void try_send(Actual_Socket s) |
538 | { |
2f75bae1 |
539 | while (s->head) { |
540 | int nsent; |
541 | DWORD err; |
32874aea |
542 | int len, urgentflag; |
543 | |
544 | if (s->sending_oob) { |
545 | urgentflag = MSG_OOB; |
546 | len = s->sending_oob; |
547 | } else { |
548 | urgentflag = 0; |
549 | len = s->head->buflen - s->head->bufpos; |
550 | } |
551 | |
552 | nsent = |
553 | send(s->s, s->head->buf + s->head->bufpos, len, urgentflag); |
554 | noise_ultralight(nsent); |
2f75bae1 |
555 | if (nsent <= 0) { |
556 | err = (nsent < 0 ? WSAGetLastError() : 0); |
32874aea |
557 | if ((err == 0 && nsent < 0) || err == WSAEWOULDBLOCK) { |
d40a94b9 |
558 | /* |
559 | * Perfectly normal: we've sent all we can for the moment. |
560 | * |
561 | * (Apparently some WinSocks can return <0 but |
562 | * leave no error indication - WSAGetLastError() is |
563 | * called but returns zero - so we check that case |
564 | * and treat it just like WSAEWOULDBLOCK.) |
565 | */ |
2f75bae1 |
566 | s->writable = FALSE; |
32874aea |
567 | return; |
2f75bae1 |
568 | } else if (nsent == 0 || |
32874aea |
569 | err == WSAECONNABORTED || err == WSAECONNRESET) { |
570 | /* |
571 | * FIXME. This will have to be done better when we |
572 | * start managing multiple sockets (e.g. SSH port |
573 | * forwarding), because if we get CONNRESET while |
574 | * trying to write a particular forwarded socket |
575 | * then it isn't necessarily the end of the world. |
576 | * Ideally I'd like to pass the error code back to |
577 | * somewhere the next select_result() will see it, |
578 | * but that might be hard. Perhaps I should pass it |
579 | * back to be queued in the Windows front end bit. |
580 | */ |
581 | fatalbox(winsock_error_string(err)); |
2f75bae1 |
582 | } else { |
583 | fatalbox(winsock_error_string(err)); |
584 | } |
585 | } else { |
586 | s->head->bufpos += nsent; |
32874aea |
587 | if (s->sending_oob) |
588 | s->sending_oob -= nsent; |
2f75bae1 |
589 | if (s->head->bufpos >= s->head->buflen) { |
590 | struct buffer *tmp = s->head; |
591 | s->head = tmp->next; |
dcbde236 |
592 | sfree(tmp); |
2f75bae1 |
593 | if (!s->head) |
594 | s->tail = NULL; |
595 | } |
596 | } |
597 | } |
598 | } |
599 | |
32874aea |
600 | static void sk_tcp_write(Socket sock, char *buf, int len) |
601 | { |
7e78000d |
602 | Actual_Socket s = (Actual_Socket) sock; |
603 | |
2f75bae1 |
604 | /* |
605 | * Add the data to the buffer list on the socket. |
606 | */ |
607 | if (s->tail && s->tail->buflen < BUFFER_GRANULE) { |
608 | int copylen = min(len, BUFFER_GRANULE - s->tail->buflen); |
609 | memcpy(s->tail->buf + s->tail->buflen, buf, copylen); |
610 | buf += copylen; |
611 | len -= copylen; |
612 | s->tail->buflen += copylen; |
613 | } |
614 | while (len > 0) { |
615 | int grainlen = min(len, BUFFER_GRANULE); |
616 | struct buffer *newbuf; |
617 | newbuf = smalloc(sizeof(struct buffer)); |
618 | newbuf->bufpos = 0; |
619 | newbuf->buflen = grainlen; |
620 | memcpy(newbuf->buf, buf, grainlen); |
621 | buf += grainlen; |
622 | len -= grainlen; |
623 | if (s->tail) |
624 | s->tail->next = newbuf; |
625 | else |
626 | s->head = s->tail = newbuf; |
627 | newbuf->next = NULL; |
628 | s->tail = newbuf; |
629 | } |
630 | |
631 | /* |
632 | * Now try sending from the start of the buffer list. |
633 | */ |
634 | if (s->writable) |
635 | try_send(s); |
636 | } |
637 | |
32874aea |
638 | static void sk_tcp_write_oob(Socket sock, char *buf, int len) |
639 | { |
7e78000d |
640 | Actual_Socket s = (Actual_Socket) sock; |
641 | |
2f75bae1 |
642 | /* |
643 | * Replace the buffer list on the socket with the data. |
644 | */ |
645 | if (!s->head) { |
646 | s->head = smalloc(sizeof(struct buffer)); |
647 | } else { |
32874aea |
648 | struct buffer *walk = s->head->next; |
649 | while (walk) { |
650 | struct buffer *tmp = walk; |
651 | walk = tmp->next; |
652 | sfree(tmp); |
653 | } |
2f75bae1 |
654 | } |
655 | s->head->next = NULL; |
656 | s->tail = s->head; |
657 | s->head->buflen = len; |
658 | memcpy(s->head->buf, buf, len); |
659 | |
660 | /* |
661 | * Set the Urgent marker. |
662 | */ |
663 | s->sending_oob = len; |
664 | |
665 | /* |
666 | * Now try sending from the start of the buffer list. |
667 | */ |
668 | if (s->writable) |
669 | try_send(s); |
670 | } |
671 | |
32874aea |
672 | int select_result(WPARAM wParam, LPARAM lParam) |
673 | { |
f9d3f227 |
674 | int ret, open; |
2f75bae1 |
675 | DWORD err; |
b675c612 |
676 | char buf[20480]; /* nice big buffer for plenty of speed */ |
7e78000d |
677 | Actual_Socket s; |
49bad831 |
678 | u_long atmark; |
2f75bae1 |
679 | |
680 | /* wParam is the socket itself */ |
32874aea |
681 | s = find234(sktree, (void *) wParam, cmpforsearch); |
2f75bae1 |
682 | if (!s) |
683 | return 1; /* boggle */ |
684 | |
685 | if ((err = WSAGETSELECTERROR(lParam)) != 0) { |
32874aea |
686 | /* |
687 | * An error has occurred on this socket. Pass it to the |
688 | * plug. |
689 | */ |
690 | return plug_closing(s->plug, winsock_error_string(err), err, 0); |
2f75bae1 |
691 | } |
692 | |
7d6ee6ff |
693 | noise_ultralight(lParam); |
694 | |
2f75bae1 |
695 | switch (WSAGETSELECTEVENT(lParam)) { |
696 | case FD_READ: |
32874aea |
697 | /* |
698 | * We have received data on the socket. For an oobinline |
699 | * socket, this might be data _before_ an urgent pointer, |
700 | * in which case we send it to the back end with type==1 |
701 | * (data prior to urgent). |
702 | */ |
703 | if (s->oobinline) { |
704 | atmark = 1; |
705 | ioctlsocket(s->s, SIOCATMARK, &atmark); |
706 | /* |
707 | * Avoid checking the return value from ioctlsocket(), |
708 | * on the grounds that some WinSock wrappers don't |
709 | * support it. If it does nothing, we get atmark==1, |
710 | * which is equivalent to `no OOB pending', so the |
711 | * effect will be to non-OOB-ify any OOB data. |
712 | */ |
713 | } else |
714 | atmark = 1; |
4b1e8acc |
715 | |
2f75bae1 |
716 | ret = recv(s->s, buf, sizeof(buf), 0); |
32874aea |
717 | noise_ultralight(ret); |
2f75bae1 |
718 | if (ret < 0) { |
719 | err = WSAGetLastError(); |
720 | if (err == WSAEWOULDBLOCK) { |
721 | break; |
722 | } |
723 | } |
724 | if (ret < 0) { |
32874aea |
725 | return plug_closing(s->plug, winsock_error_string(err), err, |
726 | 0); |
7e78000d |
727 | } else if (0 == ret) { |
32874aea |
728 | return plug_closing(s->plug, NULL, 0, 0); |
2f75bae1 |
729 | } else { |
32874aea |
730 | return plug_receive(s->plug, atmark ? 0 : 1, buf, ret); |
2f75bae1 |
731 | } |
732 | break; |
733 | case FD_OOB: |
32874aea |
734 | /* |
735 | * This will only happen on a non-oobinline socket. It |
736 | * indicates that we can immediately perform an OOB read |
737 | * and get back OOB data, which we will send to the back |
738 | * end with type==2 (urgent data). |
739 | */ |
740 | ret = recv(s->s, buf, sizeof(buf), MSG_OOB); |
741 | noise_ultralight(ret); |
742 | if (ret <= 0) { |
743 | fatalbox(ret == 0 ? "Internal networking trouble" : |
744 | winsock_error_string(WSAGetLastError())); |
745 | } else { |
746 | return plug_receive(s->plug, 2, buf, ret); |
747 | } |
748 | break; |
2f75bae1 |
749 | case FD_WRITE: |
750 | s->writable = 1; |
751 | try_send(s); |
752 | break; |
753 | case FD_CLOSE: |
f9d3f227 |
754 | /* Signal a close on the socket. First read any outstanding data. */ |
32874aea |
755 | open = 1; |
756 | do { |
757 | ret = recv(s->s, buf, sizeof(buf), 0); |
758 | if (ret < 0) { |
759 | err = WSAGetLastError(); |
760 | if (err == WSAEWOULDBLOCK) |
761 | break; |
762 | return plug_closing(s->plug, winsock_error_string(err), |
763 | err, 0); |
764 | } else { |
765 | if (ret) |
766 | open &= plug_receive(s->plug, 0, buf, ret); |
767 | else |
768 | open &= plug_closing(s->plug, NULL, 0, 0); |
7e78000d |
769 | } |
f9d3f227 |
770 | } while (ret > 0); |
32874aea |
771 | return open; |
2f75bae1 |
772 | } |
773 | |
774 | return 1; |
775 | } |
776 | |
777 | /* |
778 | * Each socket abstraction contains a `void *' private field in |
779 | * which the client can keep state. |
780 | */ |
32874aea |
781 | void sk_set_private_ptr(Socket sock, void *ptr) |
782 | { |
7e78000d |
783 | Actual_Socket s = (Actual_Socket) sock; |
2f75bae1 |
784 | s->private_ptr = ptr; |
785 | } |
32874aea |
786 | |
787 | void *sk_get_private_ptr(Socket sock) |
788 | { |
7e78000d |
789 | Actual_Socket s = (Actual_Socket) sock; |
2f75bae1 |
790 | return s->private_ptr; |
791 | } |
792 | |
793 | /* |
794 | * Special error values are returned from sk_namelookup and sk_new |
795 | * if there's a problem. These functions extract an error message, |
796 | * or return NULL if there's no problem. |
797 | */ |
32874aea |
798 | char *sk_addr_error(SockAddr addr) |
799 | { |
2f75bae1 |
800 | return addr->error; |
801 | } |
32874aea |
802 | static char *sk_tcp_socket_error(Socket sock) |
803 | { |
7e78000d |
804 | Actual_Socket s = (Actual_Socket) sock; |
2f75bae1 |
805 | return s->error; |
806 | } |
807 | |
808 | /* |
809 | * For Plink: enumerate all sockets currently active. |
810 | */ |
32874aea |
811 | SOCKET first_socket(int *state) |
812 | { |
d2371c81 |
813 | Actual_Socket s; |
814 | *state = 0; |
815 | s = index234(sktree, (*state)++); |
2f75bae1 |
816 | return s ? s->s : INVALID_SOCKET; |
817 | } |
32874aea |
818 | |
819 | SOCKET next_socket(int *state) |
820 | { |
d2371c81 |
821 | Actual_Socket s = index234(sktree, (*state)++); |
2f75bae1 |
822 | return s ? s->s : INVALID_SOCKET; |
823 | } |