2f75bae1 |
1 | /* |
2 | * Windows networking abstraction. |
c4d8e107 |
3 | * |
4 | * Due to this clean abstraction it was possible |
5 | * to easily implement IPv6 support :) |
6 | * |
7 | * IPv6 patch 1 (27 October 2000) Jeroen Massar <jeroen@unfix.org> |
8 | * - Preliminary hacked IPv6 support. |
9 | * - Connecting to IPv6 address (eg fec0:4242:4242:100:2d0:b7ff:fe8f:5d42) works. |
10 | * - Connecting to IPv6 hostname (eg heaven.ipv6.unfix.org) works. |
11 | * - Compiles as either IPv4 or IPv6. |
12 | * |
13 | * IPv6 patch 2 (29 October 2000) Jeroen Massar <jeroen@unfix.org> |
14 | * - When compiled as IPv6 it also allows connecting to IPv4 hosts. |
15 | * - Added some more documentation. |
16 | * |
17 | * IPv6 patch 3 (18 November 2000) Jeroen Massar <jeroen@unfix.org> |
18 | * - It now supports dynamically loading the IPv6 resolver dll's. |
19 | * This way we should be able to distribute one (1) binary |
20 | * which supports both IPv4 and IPv6. |
21 | * - getaddrinfo() and getnameinfo() are loaded dynamicaly if possible. |
22 | * - in6addr_any is defined in this file so we don't need to link to wship6.lib |
23 | * - The patch is now more unified so that we can still |
24 | * remove all IPv6 support by undef'ing IPV6. |
25 | * But where it fallsback to IPv4 it uses the IPv4 code which is already in place... |
26 | * - Canonical name resolving works. |
27 | * |
28 | * IPv6 patch 4 (07 January 2001) Jeroen Massar <jeroen@unfix.org> |
29 | * - patch against CVS of today, will be submitted to the bugs list |
30 | * as a 'cvs diff -u' on Simon's request... |
31 | * |
2f75bae1 |
32 | */ |
33 | |
c4d8e107 |
34 | /* |
35 | * Define IPV6 to have IPv6 on-the-fly-loading support. |
36 | * This means that one doesn't have to have an IPv6 stack to use it. |
37 | * But if an IPv6 stack is found it is used with a fallback to IPv4. |
38 | */ |
39 | /* #define IPV6 1 */ |
40 | |
41 | #ifdef IPV6 |
42 | #include <winsock2.h> |
43 | #include <ws2tcpip.h> |
44 | #include <tpipv6.h> |
45 | #else |
2f75bae1 |
46 | #include <winsock.h> |
c4d8e107 |
47 | #endif |
48 | #include <windows.h> |
2f75bae1 |
49 | #include <stdio.h> |
49bad831 |
50 | #include <stdlib.h> |
5471d09a |
51 | #include <assert.h> |
2f75bae1 |
52 | |
7e78000d |
53 | #define DEFINE_PLUG_METHOD_MACROS |
2f75bae1 |
54 | #include "putty.h" |
55 | #include "network.h" |
56 | #include "tree234.h" |
57 | |
2f75bae1 |
58 | struct Socket_tag { |
7e78000d |
59 | struct socket_function_table *fn; |
60 | /* the above variable absolutely *must* be the first in this structure */ |
2f75bae1 |
61 | char *error; |
62 | SOCKET s; |
7e78000d |
63 | Plug plug; |
2f75bae1 |
64 | void *private_ptr; |
5471d09a |
65 | bufchain output_data; |
3ad9d396 |
66 | int connected; |
2f75bae1 |
67 | int writable; |
5471d09a |
68 | int frozen; /* this causes readability notifications to be ignored */ |
69 | int frozen_readable; /* this means we missed at least one readability |
70 | * notification while we were frozen */ |
bc4802a1 |
71 | int localhost_only; /* for listening sockets */ |
5471d09a |
72 | char oobdata[1]; |
1ad4eb6f |
73 | int sending_oob; |
4b1e8acc |
74 | int oobinline; |
2f75bae1 |
75 | }; |
76 | |
7e78000d |
77 | /* |
78 | * We used to typedef struct Socket_tag *Socket. |
79 | * |
80 | * Since we have made the networking abstraction slightly more |
81 | * abstract, Socket no longer means a tcp socket (it could mean |
82 | * an ssl socket). So now we must use Actual_Socket when we know |
83 | * we are talking about a tcp socket. |
84 | */ |
85 | typedef struct Socket_tag *Actual_Socket; |
86 | |
2f75bae1 |
87 | struct SockAddr_tag { |
88 | char *error; |
c4d8e107 |
89 | /* address family this belongs to, AF_INET for IPv4, AF_INET6 for IPv6. */ |
32874aea |
90 | int family; |
c4d8e107 |
91 | unsigned long address; /* Address IPv4 style. */ |
92 | #ifdef IPV6 |
93 | struct addrinfo *ai; /* Address IPv6 style. */ |
94 | #endif |
2f75bae1 |
95 | }; |
96 | |
2f75bae1 |
97 | static tree234 *sktree; |
98 | |
32874aea |
99 | static int cmpfortree(void *av, void *bv) |
100 | { |
101 | Actual_Socket a = (Actual_Socket) av, b = (Actual_Socket) bv; |
102 | unsigned long as = (unsigned long) a->s, bs = (unsigned long) b->s; |
103 | if (as < bs) |
104 | return -1; |
105 | if (as > bs) |
106 | return +1; |
2f75bae1 |
107 | return 0; |
108 | } |
109 | |
32874aea |
110 | static int cmpforsearch(void *av, void *bv) |
111 | { |
112 | Actual_Socket b = (Actual_Socket) bv; |
113 | unsigned long as = (unsigned long) av, bs = (unsigned long) b->s; |
114 | if (as < bs) |
115 | return -1; |
116 | if (as > bs) |
117 | return +1; |
2f75bae1 |
118 | return 0; |
119 | } |
120 | |
32874aea |
121 | void sk_init(void) |
122 | { |
2f75bae1 |
123 | sktree = newtree234(cmpfortree); |
124 | } |
125 | |
32874aea |
126 | char *winsock_error_string(int error) |
127 | { |
e74fbad9 |
128 | switch (error) { |
32874aea |
129 | case WSAEACCES: |
130 | return "Network error: Permission denied"; |
131 | case WSAEADDRINUSE: |
132 | return "Network error: Address already in use"; |
133 | case WSAEADDRNOTAVAIL: |
134 | return "Network error: Cannot assign requested address"; |
135 | case WSAEAFNOSUPPORT: |
136 | return |
137 | "Network error: Address family not supported by protocol family"; |
138 | case WSAEALREADY: |
139 | return "Network error: Operation already in progress"; |
140 | case WSAECONNABORTED: |
141 | return "Network error: Software caused connection abort"; |
142 | case WSAECONNREFUSED: |
143 | return "Network error: Connection refused"; |
144 | case WSAECONNRESET: |
145 | return "Network error: Connection reset by peer"; |
146 | case WSAEDESTADDRREQ: |
147 | return "Network error: Destination address required"; |
148 | case WSAEFAULT: |
149 | return "Network error: Bad address"; |
150 | case WSAEHOSTDOWN: |
151 | return "Network error: Host is down"; |
152 | case WSAEHOSTUNREACH: |
153 | return "Network error: No route to host"; |
154 | case WSAEINPROGRESS: |
155 | return "Network error: Operation now in progress"; |
156 | case WSAEINTR: |
157 | return "Network error: Interrupted function call"; |
158 | case WSAEINVAL: |
159 | return "Network error: Invalid argument"; |
160 | case WSAEISCONN: |
161 | return "Network error: Socket is already connected"; |
162 | case WSAEMFILE: |
163 | return "Network error: Too many open files"; |
164 | case WSAEMSGSIZE: |
165 | return "Network error: Message too long"; |
166 | case WSAENETDOWN: |
167 | return "Network error: Network is down"; |
168 | case WSAENETRESET: |
169 | return "Network error: Network dropped connection on reset"; |
170 | case WSAENETUNREACH: |
171 | return "Network error: Network is unreachable"; |
172 | case WSAENOBUFS: |
173 | return "Network error: No buffer space available"; |
174 | case WSAENOPROTOOPT: |
175 | return "Network error: Bad protocol option"; |
176 | case WSAENOTCONN: |
177 | return "Network error: Socket is not connected"; |
178 | case WSAENOTSOCK: |
179 | return "Network error: Socket operation on non-socket"; |
180 | case WSAEOPNOTSUPP: |
181 | return "Network error: Operation not supported"; |
182 | case WSAEPFNOSUPPORT: |
183 | return "Network error: Protocol family not supported"; |
184 | case WSAEPROCLIM: |
185 | return "Network error: Too many processes"; |
186 | case WSAEPROTONOSUPPORT: |
187 | return "Network error: Protocol not supported"; |
188 | case WSAEPROTOTYPE: |
189 | return "Network error: Protocol wrong type for socket"; |
190 | case WSAESHUTDOWN: |
191 | return "Network error: Cannot send after socket shutdown"; |
192 | case WSAESOCKTNOSUPPORT: |
193 | return "Network error: Socket type not supported"; |
194 | case WSAETIMEDOUT: |
195 | return "Network error: Connection timed out"; |
196 | case WSAEWOULDBLOCK: |
197 | return "Network error: Resource temporarily unavailable"; |
198 | case WSAEDISCON: |
199 | return "Network error: Graceful shutdown in progress"; |
200 | default: |
201 | return "Unknown network error"; |
e74fbad9 |
202 | } |
203 | } |
204 | |
c4d8e107 |
205 | SockAddr sk_namelookup(char *host, char **canonicalname) |
206 | { |
2f75bae1 |
207 | SockAddr ret = smalloc(sizeof(struct SockAddr_tag)); |
208 | unsigned long a; |
c4d8e107 |
209 | struct hostent *h = NULL; |
6e1ebb76 |
210 | char realhost[8192]; |
2f75bae1 |
211 | |
c4d8e107 |
212 | /* Clear the structure and default to IPv4. */ |
213 | memset(ret, 0, sizeof(struct SockAddr_tag)); |
214 | ret->family = 0; /* We set this one when we have resolved the host. */ |
6e1ebb76 |
215 | *realhost = '\0'; |
c4d8e107 |
216 | |
32874aea |
217 | if ((a = inet_addr(host)) == (unsigned long) INADDR_NONE) { |
c4d8e107 |
218 | #ifdef IPV6 |
219 | |
220 | /* Try to get the getaddrinfo() function from wship6.dll */ |
221 | /* This way one doesn't need to have IPv6 dll's to use PuTTY and |
222 | * it will fallback to IPv4. */ |
32874aea |
223 | typedef int (CALLBACK * FGETADDRINFO) (const char *nodename, |
224 | const char *servname, |
225 | const struct addrinfo * |
226 | hints, |
227 | struct addrinfo ** res); |
c4d8e107 |
228 | FGETADDRINFO fGetAddrInfo = NULL; |
229 | |
230 | HINSTANCE dllWSHIP6 = LoadLibrary("wship6.dll"); |
231 | if (dllWSHIP6) |
32874aea |
232 | fGetAddrInfo = (FGETADDRINFO) GetProcAddress(dllWSHIP6, |
233 | "getaddrinfo"); |
c4d8e107 |
234 | |
235 | /* |
236 | * Use fGetAddrInfo when it's available (which usually also |
237 | * means IPv6 is installed...) |
238 | */ |
32874aea |
239 | if (fGetAddrInfo) { |
c4d8e107 |
240 | /*debug(("Resolving \"%s\" with getaddrinfo() (IPv4+IPv6 capable)...\n", host)); */ |
241 | if (fGetAddrInfo(host, NULL, NULL, &ret->ai) == 0) |
242 | ret->family = ret->ai->ai_family; |
32874aea |
243 | } else |
c4d8e107 |
244 | #endif |
32874aea |
245 | { |
c4d8e107 |
246 | /* |
247 | * Otherwise use the IPv4-only gethostbyname... |
248 | * (NOTE: we don't use gethostbyname as a |
249 | * fallback!) |
250 | */ |
32874aea |
251 | if (ret->family == 0) { |
252 | /*debug(("Resolving \"%s\" with gethostbyname() (IPv4 only)...\n", host)); */ |
2d466ffd |
253 | if ( (h = gethostbyname(host)) ) |
32874aea |
254 | ret->family = AF_INET; |
255 | } |
c4d8e107 |
256 | } |
257 | /*debug(("Done resolving...(family is %d) AF_INET = %d, AF_INET6 = %d\n", ret->family, AF_INET, AF_INET6)); */ |
258 | |
32874aea |
259 | if (ret->family == 0) { |
2f75bae1 |
260 | DWORD err = WSAGetLastError(); |
c4d8e107 |
261 | ret->error = (err == WSAENETDOWN ? "Network is down" : |
32874aea |
262 | err == |
263 | WSAHOST_NOT_FOUND ? "Host does not exist" : err |
264 | == WSATRY_AGAIN ? "Host not found" : |
c4d8e107 |
265 | #ifdef IPV6 |
266 | fGetAddrInfo ? "getaddrinfo: unknown error" : |
267 | #endif |
268 | "gethostbyname: unknown error"); |
269 | #ifdef DEBUG |
270 | { |
271 | LPVOID lpMsgBuf; |
32874aea |
272 | FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | |
273 | FORMAT_MESSAGE_FROM_SYSTEM | |
274 | FORMAT_MESSAGE_IGNORE_INSERTS, NULL, err, |
275 | MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), |
276 | (LPTSTR) & lpMsgBuf, 0, NULL); |
277 | /*debug(("Error %ld: %s (h=%lx)\n", err, lpMsgBuf, h)); */ |
c4d8e107 |
278 | /* Free the buffer. */ |
279 | LocalFree(lpMsgBuf); |
280 | } |
281 | #endif |
32874aea |
282 | } else { |
c4d8e107 |
283 | ret->error = NULL; |
284 | |
285 | #ifdef IPV6 |
286 | /* If we got an address info use that... */ |
32874aea |
287 | if (ret->ai) { |
288 | typedef int (CALLBACK * FGETNAMEINFO) |
289 | (const struct sockaddr FAR * sa, socklen_t salen, |
290 | char FAR * host, size_t hostlen, char FAR * serv, |
291 | size_t servlen, int flags); |
c4d8e107 |
292 | FGETNAMEINFO fGetNameInfo = NULL; |
293 | |
294 | /* Are we in IPv4 fallback mode? */ |
295 | /* We put the IPv4 address into the a variable so we can further-on use the IPv4 code... */ |
296 | if (ret->family == AF_INET) |
32874aea |
297 | memcpy(&a, |
298 | (char *) &((SOCKADDR_IN *) ret->ai-> |
299 | ai_addr)->sin_addr, sizeof(a)); |
c4d8e107 |
300 | |
301 | /* Now let's find that canonicalname... */ |
32874aea |
302 | if ((dllWSHIP6) |
303 | && (fGetNameInfo = |
304 | (FGETNAMEINFO) GetProcAddress(dllWSHIP6, |
305 | "getnameinfo"))) { |
306 | if (fGetNameInfo |
307 | ((struct sockaddr *) ret->ai->ai_addr, |
308 | ret->family == |
309 | AF_INET ? sizeof(SOCKADDR_IN) : |
6e1ebb76 |
310 | sizeof(SOCKADDR_IN6), realhost, |
311 | sizeof(realhost), NULL, 0, 0) != 0) { |
312 | strncpy(realhost, host, sizeof(realhost)); |
c4d8e107 |
313 | } |
314 | } |
315 | } |
316 | /* We used the IPv4-only gethostbyname()... */ |
317 | else |
c4d8e107 |
318 | #endif |
32874aea |
319 | { |
c4d8e107 |
320 | memcpy(&a, h->h_addr, sizeof(a)); |
321 | /* This way we are always sure the h->h_name is valid :) */ |
6e1ebb76 |
322 | strncpy(realhost, h->h_name, sizeof(realhost)); |
c4d8e107 |
323 | } |
c4d8e107 |
324 | } |
325 | #ifdef IPV6 |
326 | FreeLibrary(dllWSHIP6); |
327 | #endif |
32874aea |
328 | } else { |
87ed061f |
329 | /* |
330 | * This must be a numeric IPv4 address because it caused a |
331 | * success return from inet_addr. |
332 | */ |
32874aea |
333 | ret->family = AF_INET; |
6e1ebb76 |
334 | strncpy(realhost, host, sizeof(realhost)); |
2f75bae1 |
335 | } |
336 | ret->address = ntohl(a); |
6e1ebb76 |
337 | realhost[lenof(realhost)-1] = '\0'; |
338 | *canonicalname = smalloc(1+strlen(realhost)); |
339 | strcpy(*canonicalname, realhost); |
2f75bae1 |
340 | return ret; |
341 | } |
342 | |
3ad9d396 |
343 | void sk_getaddr(SockAddr addr, char *buf, int buflen) |
344 | { |
345 | #ifdef IPV6 |
346 | if (addr->family == AF_INET) { |
347 | #endif |
348 | struct in_addr a; |
349 | a.s_addr = htonl(addr->address); |
350 | strncpy(buf, inet_ntoa(a), buflen); |
351 | #ifdef IPV6 |
352 | } else { |
353 | FIXME; /* I don't know how to get a text form of an IPv6 address. */ |
354 | } |
355 | #endif |
356 | } |
357 | |
32874aea |
358 | void sk_addr_free(SockAddr addr) |
359 | { |
2f75bae1 |
360 | sfree(addr); |
361 | } |
362 | |
32874aea |
363 | static Plug sk_tcp_plug(Socket sock, Plug p) |
364 | { |
7e78000d |
365 | Actual_Socket s = (Actual_Socket) sock; |
366 | Plug ret = s->plug; |
32874aea |
367 | if (p) |
368 | s->plug = p; |
7e78000d |
369 | return ret; |
370 | } |
371 | |
32874aea |
372 | static void sk_tcp_flush(Socket s) |
373 | { |
7e78000d |
374 | /* |
375 | * We send data to the socket as soon as we can anyway, |
376 | * so we don't need to do anything here. :-) |
377 | */ |
378 | } |
379 | |
2d466ffd |
380 | static void sk_tcp_close(Socket s); |
5471d09a |
381 | static int sk_tcp_write(Socket s, char *data, int len); |
382 | static int sk_tcp_write_oob(Socket s, char *data, int len); |
2d466ffd |
383 | static char *sk_tcp_socket_error(Socket s); |
7e78000d |
384 | |
d74d141c |
385 | extern char *do_select(SOCKET skt, int startup); |
386 | |
387 | Socket sk_register(void *sock, Plug plug) |
388 | { |
389 | static struct socket_function_table fn_table = { |
390 | sk_tcp_plug, |
391 | sk_tcp_close, |
392 | sk_tcp_write, |
393 | sk_tcp_write_oob, |
394 | sk_tcp_flush, |
395 | sk_tcp_socket_error |
396 | }; |
397 | |
398 | DWORD err; |
399 | char *errstr; |
400 | Actual_Socket ret; |
401 | |
402 | /* |
403 | * Create Socket structure. |
404 | */ |
405 | ret = smalloc(sizeof(struct Socket_tag)); |
406 | ret->fn = &fn_table; |
407 | ret->error = NULL; |
408 | ret->plug = plug; |
5471d09a |
409 | bufchain_init(&ret->output_data); |
d74d141c |
410 | ret->writable = 1; /* to start with */ |
411 | ret->sending_oob = 0; |
412 | ret->frozen = 1; |
5471d09a |
413 | ret->frozen_readable = 0; |
bc4802a1 |
414 | ret->localhost_only = 0; /* unused, but best init anyway */ |
d74d141c |
415 | |
416 | ret->s = (SOCKET)sock; |
417 | |
418 | if (ret->s == INVALID_SOCKET) { |
419 | err = WSAGetLastError(); |
420 | ret->error = winsock_error_string(err); |
421 | return (Socket) ret; |
422 | } |
423 | |
424 | ret->oobinline = 0; |
425 | |
426 | /* Set up a select mechanism. This could be an AsyncSelect on a |
427 | * window, or an EventSelect on an event object. */ |
428 | errstr = do_select(ret->s, 1); |
429 | if (errstr) { |
430 | ret->error = errstr; |
431 | return (Socket) ret; |
432 | } |
433 | |
434 | add234(sktree, ret); |
435 | |
436 | return (Socket) ret; |
437 | } |
438 | |
4b1e8acc |
439 | Socket sk_new(SockAddr addr, int port, int privport, int oobinline, |
32874aea |
440 | Plug plug) |
7e78000d |
441 | { |
442 | static struct socket_function_table fn_table = { |
443 | sk_tcp_plug, |
444 | sk_tcp_close, |
445 | sk_tcp_write, |
446 | sk_tcp_write_oob, |
447 | sk_tcp_flush, |
448 | sk_tcp_socket_error |
449 | }; |
450 | |
2f75bae1 |
451 | SOCKET s; |
c4d8e107 |
452 | #ifdef IPV6 |
453 | SOCKADDR_IN6 a6; |
454 | #endif |
2f75bae1 |
455 | SOCKADDR_IN a; |
456 | DWORD err; |
457 | char *errstr; |
7e78000d |
458 | Actual_Socket ret; |
c91409da |
459 | short localport; |
2f75bae1 |
460 | |
461 | /* |
462 | * Create Socket structure. |
463 | */ |
464 | ret = smalloc(sizeof(struct Socket_tag)); |
7e78000d |
465 | ret->fn = &fn_table; |
2f75bae1 |
466 | ret->error = NULL; |
7e78000d |
467 | ret->plug = plug; |
5471d09a |
468 | bufchain_init(&ret->output_data); |
3ad9d396 |
469 | ret->connected = 0; /* to start with */ |
470 | ret->writable = 0; /* to start with */ |
33232c8f |
471 | ret->sending_oob = 0; |
d74d141c |
472 | ret->frozen = 0; |
5471d09a |
473 | ret->frozen_readable = 0; |
bc4802a1 |
474 | ret->localhost_only = 0; /* unused, but best init anyway */ |
2f75bae1 |
475 | |
476 | /* |
477 | * Open socket. |
478 | */ |
c4d8e107 |
479 | s = socket(addr->family, SOCK_STREAM, 0); |
2f75bae1 |
480 | ret->s = s; |
481 | |
482 | if (s == INVALID_SOCKET) { |
483 | err = WSAGetLastError(); |
32874aea |
484 | ret->error = winsock_error_string(err); |
7e78000d |
485 | return (Socket) ret; |
2f75bae1 |
486 | } |
4b1e8acc |
487 | |
488 | ret->oobinline = oobinline; |
489 | if (oobinline) { |
1ad4eb6f |
490 | BOOL b = TRUE; |
32874aea |
491 | setsockopt(s, SOL_SOCKET, SO_OOBINLINE, (void *) &b, sizeof(b)); |
1ad4eb6f |
492 | } |
2f75bae1 |
493 | |
494 | /* |
495 | * Bind to local address. |
496 | */ |
c91409da |
497 | if (privport) |
32874aea |
498 | localport = 1023; /* count from 1023 downwards */ |
c4d8e107 |
499 | else |
32874aea |
500 | localport = 0; /* just use port 0 (ie winsock picks) */ |
c91409da |
501 | |
502 | /* Loop round trying to bind */ |
503 | while (1) { |
32874aea |
504 | int retcode; |
c91409da |
505 | |
506 | #ifdef IPV6 |
32874aea |
507 | if (addr->family == AF_INET6) { |
508 | memset(&a6, 0, sizeof(a6)); |
509 | a6.sin6_family = AF_INET6; |
510 | /*a6.sin6_addr = in6addr_any; *//* == 0 */ |
511 | a6.sin6_port = htons(localport); |
512 | } else |
c4d8e107 |
513 | #endif |
32874aea |
514 | { |
515 | a.sin_family = AF_INET; |
516 | a.sin_addr.s_addr = htonl(INADDR_ANY); |
517 | a.sin_port = htons(localport); |
518 | } |
c4d8e107 |
519 | #ifdef IPV6 |
32874aea |
520 | retcode = bind(s, (addr->family == AF_INET6 ? |
521 | (struct sockaddr *) &a6 : |
522 | (struct sockaddr *) &a), |
523 | (addr->family == |
524 | AF_INET6 ? sizeof(a6) : sizeof(a))); |
c4d8e107 |
525 | #else |
32874aea |
526 | retcode = bind(s, (struct sockaddr *) &a, sizeof(a)); |
c4d8e107 |
527 | #endif |
32874aea |
528 | if (retcode != SOCKET_ERROR) { |
529 | err = 0; |
530 | break; /* done */ |
531 | } else { |
532 | err = WSAGetLastError(); |
533 | if (err != WSAEADDRINUSE) /* failed, for a bad reason */ |
534 | break; |
535 | } |
536 | |
537 | if (localport == 0) |
538 | break; /* we're only looping once */ |
539 | localport--; |
540 | if (localport == 0) |
541 | break; /* we might have got to the end */ |
c91409da |
542 | } |
543 | |
32874aea |
544 | if (err) { |
c4d8e107 |
545 | ret->error = winsock_error_string(err); |
7e78000d |
546 | return (Socket) ret; |
2f75bae1 |
547 | } |
548 | |
549 | /* |
550 | * Connect to remote address. |
551 | */ |
c4d8e107 |
552 | #ifdef IPV6 |
32874aea |
553 | if (addr->family == AF_INET6) { |
554 | memset(&a, 0, sizeof(a)); |
c4d8e107 |
555 | a6.sin6_family = AF_INET6; |
32874aea |
556 | a6.sin6_port = htons((short) port); |
557 | a6.sin6_addr = |
558 | ((struct sockaddr_in6 *) addr->ai->ai_addr)->sin6_addr; |
559 | } else |
c4d8e107 |
560 | #endif |
32874aea |
561 | { |
c4d8e107 |
562 | a.sin_family = AF_INET; |
563 | a.sin_addr.s_addr = htonl(addr->address); |
32874aea |
564 | a.sin_port = htons((short) port); |
c4d8e107 |
565 | } |
3ad9d396 |
566 | |
567 | /* Set up a select mechanism. This could be an AsyncSelect on a |
568 | * window, or an EventSelect on an event object. */ |
569 | errstr = do_select(s, 1); |
570 | if (errstr) { |
571 | ret->error = errstr; |
572 | return (Socket) ret; |
573 | } |
574 | |
32874aea |
575 | if (( |
576 | #ifdef IPV6 |
577 | connect(s, ((addr->family == AF_INET6) ? |
578 | (struct sockaddr *) &a6 : (struct sockaddr *) &a), |
579 | (addr->family == AF_INET6) ? sizeof(a6) : sizeof(a)) |
c4d8e107 |
580 | #else |
32874aea |
581 | connect(s, (struct sockaddr *) &a, sizeof(a)) |
c4d8e107 |
582 | #endif |
32874aea |
583 | ) == SOCKET_ERROR) { |
2f75bae1 |
584 | err = WSAGetLastError(); |
3ad9d396 |
585 | /* |
586 | * We expect a potential EWOULDBLOCK here, because the |
587 | * chances are the front end has done a select for |
588 | * FD_CONNECT, so that connect() will complete |
589 | * asynchronously. |
590 | */ |
591 | if ( err != WSAEWOULDBLOCK ) { |
592 | ret->error = winsock_error_string(err); |
593 | return (Socket) ret; |
594 | } |
595 | } else { |
596 | /* |
597 | * If we _don't_ get EWOULDBLOCK, the connect has completed |
598 | * and we should set the socket as writable. |
599 | */ |
600 | ret->writable = 1; |
2f75bae1 |
601 | } |
602 | |
603 | add234(sktree, ret); |
604 | |
7e78000d |
605 | return (Socket) ret; |
2f75bae1 |
606 | } |
607 | |
bcce45ed |
608 | Socket sk_newlistener(int port, Plug plug, int local_host_only) |
d74d141c |
609 | { |
610 | static struct socket_function_table fn_table = { |
611 | sk_tcp_plug, |
612 | sk_tcp_close, |
613 | sk_tcp_write, |
614 | sk_tcp_write_oob, |
615 | sk_tcp_flush, |
616 | sk_tcp_socket_error |
617 | }; |
618 | |
619 | SOCKET s; |
620 | #ifdef IPV6 |
621 | SOCKADDR_IN6 a6; |
622 | #endif |
623 | SOCKADDR_IN a; |
624 | DWORD err; |
625 | char *errstr; |
626 | Actual_Socket ret; |
627 | int retcode; |
628 | int on = 1; |
629 | |
630 | /* |
631 | * Create Socket structure. |
632 | */ |
633 | ret = smalloc(sizeof(struct Socket_tag)); |
634 | ret->fn = &fn_table; |
635 | ret->error = NULL; |
636 | ret->plug = plug; |
5471d09a |
637 | bufchain_init(&ret->output_data); |
d74d141c |
638 | ret->writable = 0; /* to start with */ |
639 | ret->sending_oob = 0; |
640 | ret->frozen = 0; |
5471d09a |
641 | ret->frozen_readable = 0; |
bc4802a1 |
642 | ret->localhost_only = local_host_only; |
d74d141c |
643 | |
644 | /* |
645 | * Open socket. |
646 | */ |
647 | s = socket(AF_INET, SOCK_STREAM, 0); |
648 | ret->s = s; |
649 | |
650 | if (s == INVALID_SOCKET) { |
651 | err = WSAGetLastError(); |
652 | ret->error = winsock_error_string(err); |
653 | return (Socket) ret; |
654 | } |
655 | |
656 | ret->oobinline = 0; |
657 | |
658 | |
659 | setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (const char *)&on, sizeof(on)); |
660 | |
661 | |
662 | #ifdef IPV6 |
663 | if (addr->family == AF_INET6) { |
664 | memset(&a6, 0, sizeof(a6)); |
665 | a6.sin6_family = AF_INET6; |
bcce45ed |
666 | if (local_host_only) |
667 | a6.sin6_addr = in6addr_loopback; |
668 | else |
669 | a6.sin6_addr = in6addr_any; |
d74d141c |
670 | a6.sin6_port = htons(port); |
671 | } else |
672 | #endif |
673 | { |
674 | a.sin_family = AF_INET; |
bcce45ed |
675 | if (local_host_only) |
676 | a.sin_addr.s_addr = htonl(INADDR_LOOPBACK); |
677 | else |
678 | a.sin_addr.s_addr = htonl(INADDR_ANY); |
d74d141c |
679 | a.sin_port = htons((short)port); |
680 | } |
681 | #ifdef IPV6 |
682 | retcode = bind(s, (addr->family == AF_INET6 ? |
683 | (struct sockaddr *) &a6 : |
684 | (struct sockaddr *) &a), |
685 | (addr->family == |
686 | AF_INET6 ? sizeof(a6) : sizeof(a))); |
687 | #else |
688 | retcode = bind(s, (struct sockaddr *) &a, sizeof(a)); |
689 | #endif |
690 | if (retcode != SOCKET_ERROR) { |
691 | err = 0; |
692 | } else { |
693 | err = WSAGetLastError(); |
694 | } |
695 | |
696 | if (err) { |
697 | ret->error = winsock_error_string(err); |
698 | return (Socket) ret; |
699 | } |
700 | |
701 | |
702 | if (listen(s, SOMAXCONN) == SOCKET_ERROR) { |
703 | closesocket(s); |
704 | ret->error = winsock_error_string(err); |
705 | return (Socket) ret; |
706 | } |
707 | |
708 | /* Set up a select mechanism. This could be an AsyncSelect on a |
709 | * window, or an EventSelect on an event object. */ |
710 | errstr = do_select(s, 1); |
711 | if (errstr) { |
712 | ret->error = errstr; |
713 | return (Socket) ret; |
714 | } |
715 | |
716 | add234(sktree, ret); |
717 | |
718 | return (Socket) ret; |
719 | } |
720 | |
32874aea |
721 | static void sk_tcp_close(Socket sock) |
722 | { |
9c964e85 |
723 | extern char *do_select(SOCKET skt, int startup); |
7e78000d |
724 | Actual_Socket s = (Actual_Socket) sock; |
9c964e85 |
725 | |
2f75bae1 |
726 | del234(sktree, s); |
727 | do_select(s->s, 0); |
728 | closesocket(s->s); |
dcbde236 |
729 | sfree(s); |
2f75bae1 |
730 | } |
731 | |
2f75bae1 |
732 | /* |
733 | * The function which tries to send on a socket once it's deemed |
734 | * writable. |
735 | */ |
32874aea |
736 | void try_send(Actual_Socket s) |
737 | { |
5471d09a |
738 | while (s->sending_oob || bufchain_size(&s->output_data) > 0) { |
2f75bae1 |
739 | int nsent; |
740 | DWORD err; |
5471d09a |
741 | void *data; |
32874aea |
742 | int len, urgentflag; |
743 | |
744 | if (s->sending_oob) { |
745 | urgentflag = MSG_OOB; |
746 | len = s->sending_oob; |
5471d09a |
747 | data = &s->oobdata; |
32874aea |
748 | } else { |
749 | urgentflag = 0; |
5471d09a |
750 | bufchain_prefix(&s->output_data, &data, &len); |
32874aea |
751 | } |
5471d09a |
752 | nsent = send(s->s, data, len, urgentflag); |
32874aea |
753 | noise_ultralight(nsent); |
2f75bae1 |
754 | if (nsent <= 0) { |
755 | err = (nsent < 0 ? WSAGetLastError() : 0); |
e5eb3a1c |
756 | if ((err < WSABASEERR && nsent < 0) || err == WSAEWOULDBLOCK) { |
d40a94b9 |
757 | /* |
758 | * Perfectly normal: we've sent all we can for the moment. |
759 | * |
e5eb3a1c |
760 | * (Some WinSock send() implementations can return |
761 | * <0 but leave no sensible error indication - |
762 | * WSAGetLastError() is called but returns zero or |
763 | * a small number - so we check that case and treat |
764 | * it just like WSAEWOULDBLOCK.) |
d40a94b9 |
765 | */ |
2f75bae1 |
766 | s->writable = FALSE; |
32874aea |
767 | return; |
2f75bae1 |
768 | } else if (nsent == 0 || |
32874aea |
769 | err == WSAECONNABORTED || err == WSAECONNRESET) { |
770 | /* |
a073bee1 |
771 | * ASSUMPTION: |
772 | * |
773 | * I'm assuming here that if a TCP connection is |
774 | * reset or aborted once established, we will be |
775 | * notified by a select event rather than a |
776 | * CONNABORTED or CONNRESET from send(). In other |
777 | * words, I'm assuming CONNABORTED and CONNRESET |
778 | * don't come back from a _nonblocking_ send(), |
779 | * because the local side doesn't know they've |
780 | * happened until it waits for a response to its |
781 | * TCP segment - so the error will arrive |
782 | * asynchronously. |
783 | * |
784 | * If I'm wrong, this will be a really nasty case, |
785 | * because we can't necessarily call plug_closing() |
786 | * without having to make half the SSH code |
787 | * reentrant; so instead we'll have to schedule a |
788 | * call to plug_closing() for some suitable future |
789 | * time. |
32874aea |
790 | */ |
a073bee1 |
791 | fatalbox("SERIOUS NETWORK INTERNAL ERROR: %s\n" |
792 | "Please report this immediately to " |
793 | "<putty@projects.tartarus.org>.", |
794 | winsock_error_string(err)); |
2f75bae1 |
795 | } else { |
796 | fatalbox(winsock_error_string(err)); |
797 | } |
798 | } else { |
5471d09a |
799 | if (s->sending_oob) { |
800 | if (nsent < len) { |
801 | memmove(s->oobdata, s->oobdata+nsent, len-nsent); |
802 | s->sending_oob = len - nsent; |
803 | } else { |
804 | s->sending_oob = 0; |
805 | } |
806 | } else { |
807 | bufchain_consume(&s->output_data, nsent); |
2f75bae1 |
808 | } |
809 | } |
810 | } |
811 | } |
812 | |
5471d09a |
813 | static int sk_tcp_write(Socket sock, char *buf, int len) |
32874aea |
814 | { |
7e78000d |
815 | Actual_Socket s = (Actual_Socket) sock; |
816 | |
2f75bae1 |
817 | /* |
818 | * Add the data to the buffer list on the socket. |
819 | */ |
5471d09a |
820 | bufchain_add(&s->output_data, buf, len); |
2f75bae1 |
821 | |
822 | /* |
823 | * Now try sending from the start of the buffer list. |
824 | */ |
825 | if (s->writable) |
826 | try_send(s); |
5471d09a |
827 | |
828 | return bufchain_size(&s->output_data); |
2f75bae1 |
829 | } |
830 | |
5471d09a |
831 | static int sk_tcp_write_oob(Socket sock, char *buf, int len) |
32874aea |
832 | { |
7e78000d |
833 | Actual_Socket s = (Actual_Socket) sock; |
834 | |
2f75bae1 |
835 | /* |
836 | * Replace the buffer list on the socket with the data. |
837 | */ |
5471d09a |
838 | bufchain_clear(&s->output_data); |
839 | assert(len <= sizeof(s->oobdata)); |
840 | memcpy(s->oobdata, buf, len); |
2f75bae1 |
841 | s->sending_oob = len; |
842 | |
843 | /* |
844 | * Now try sending from the start of the buffer list. |
845 | */ |
846 | if (s->writable) |
847 | try_send(s); |
5471d09a |
848 | |
849 | return s->sending_oob; |
2f75bae1 |
850 | } |
851 | |
32874aea |
852 | int select_result(WPARAM wParam, LPARAM lParam) |
853 | { |
f9d3f227 |
854 | int ret, open; |
2f75bae1 |
855 | DWORD err; |
b675c612 |
856 | char buf[20480]; /* nice big buffer for plenty of speed */ |
7e78000d |
857 | Actual_Socket s; |
49bad831 |
858 | u_long atmark; |
2f75bae1 |
859 | |
860 | /* wParam is the socket itself */ |
32874aea |
861 | s = find234(sktree, (void *) wParam, cmpforsearch); |
2f75bae1 |
862 | if (!s) |
863 | return 1; /* boggle */ |
864 | |
865 | if ((err = WSAGETSELECTERROR(lParam)) != 0) { |
32874aea |
866 | /* |
867 | * An error has occurred on this socket. Pass it to the |
868 | * plug. |
869 | */ |
870 | return plug_closing(s->plug, winsock_error_string(err), err, 0); |
2f75bae1 |
871 | } |
872 | |
7d6ee6ff |
873 | noise_ultralight(lParam); |
874 | |
2f75bae1 |
875 | switch (WSAGETSELECTEVENT(lParam)) { |
3ad9d396 |
876 | case FD_CONNECT: |
877 | s->connected = s->writable = 1; |
878 | break; |
2f75bae1 |
879 | case FD_READ: |
d74d141c |
880 | /* In the case the socket is still frozen, we don't even bother */ |
5471d09a |
881 | if (s->frozen) { |
882 | s->frozen_readable = 1; |
d74d141c |
883 | break; |
5471d09a |
884 | } |
d74d141c |
885 | |
32874aea |
886 | /* |
887 | * We have received data on the socket. For an oobinline |
888 | * socket, this might be data _before_ an urgent pointer, |
889 | * in which case we send it to the back end with type==1 |
890 | * (data prior to urgent). |
891 | */ |
892 | if (s->oobinline) { |
893 | atmark = 1; |
894 | ioctlsocket(s->s, SIOCATMARK, &atmark); |
895 | /* |
896 | * Avoid checking the return value from ioctlsocket(), |
897 | * on the grounds that some WinSock wrappers don't |
898 | * support it. If it does nothing, we get atmark==1, |
899 | * which is equivalent to `no OOB pending', so the |
900 | * effect will be to non-OOB-ify any OOB data. |
901 | */ |
902 | } else |
903 | atmark = 1; |
4b1e8acc |
904 | |
2f75bae1 |
905 | ret = recv(s->s, buf, sizeof(buf), 0); |
32874aea |
906 | noise_ultralight(ret); |
2f75bae1 |
907 | if (ret < 0) { |
908 | err = WSAGetLastError(); |
909 | if (err == WSAEWOULDBLOCK) { |
910 | break; |
911 | } |
912 | } |
913 | if (ret < 0) { |
32874aea |
914 | return plug_closing(s->plug, winsock_error_string(err), err, |
915 | 0); |
7e78000d |
916 | } else if (0 == ret) { |
32874aea |
917 | return plug_closing(s->plug, NULL, 0, 0); |
2f75bae1 |
918 | } else { |
32874aea |
919 | return plug_receive(s->plug, atmark ? 0 : 1, buf, ret); |
2f75bae1 |
920 | } |
921 | break; |
922 | case FD_OOB: |
32874aea |
923 | /* |
924 | * This will only happen on a non-oobinline socket. It |
925 | * indicates that we can immediately perform an OOB read |
926 | * and get back OOB data, which we will send to the back |
927 | * end with type==2 (urgent data). |
928 | */ |
929 | ret = recv(s->s, buf, sizeof(buf), MSG_OOB); |
930 | noise_ultralight(ret); |
931 | if (ret <= 0) { |
932 | fatalbox(ret == 0 ? "Internal networking trouble" : |
933 | winsock_error_string(WSAGetLastError())); |
934 | } else { |
935 | return plug_receive(s->plug, 2, buf, ret); |
936 | } |
937 | break; |
2f75bae1 |
938 | case FD_WRITE: |
5471d09a |
939 | { |
940 | int bufsize_before, bufsize_after; |
941 | s->writable = 1; |
942 | bufsize_before = s->sending_oob + bufchain_size(&s->output_data); |
943 | try_send(s); |
944 | bufsize_after = s->sending_oob + bufchain_size(&s->output_data); |
945 | if (bufsize_after < bufsize_before) |
946 | plug_sent(s->plug, bufsize_after); |
947 | } |
2f75bae1 |
948 | break; |
949 | case FD_CLOSE: |
f9d3f227 |
950 | /* Signal a close on the socket. First read any outstanding data. */ |
32874aea |
951 | open = 1; |
952 | do { |
953 | ret = recv(s->s, buf, sizeof(buf), 0); |
954 | if (ret < 0) { |
955 | err = WSAGetLastError(); |
956 | if (err == WSAEWOULDBLOCK) |
957 | break; |
958 | return plug_closing(s->plug, winsock_error_string(err), |
959 | err, 0); |
960 | } else { |
961 | if (ret) |
962 | open &= plug_receive(s->plug, 0, buf, ret); |
963 | else |
964 | open &= plug_closing(s->plug, NULL, 0, 0); |
7e78000d |
965 | } |
f9d3f227 |
966 | } while (ret > 0); |
32874aea |
967 | return open; |
d74d141c |
968 | case FD_ACCEPT: |
969 | { |
bc4802a1 |
970 | struct sockaddr_in isa; |
971 | int addrlen = sizeof(struct sockaddr_in); |
bcce45ed |
972 | SOCKET t; /* socket of connection */ |
973 | |
bc4802a1 |
974 | memset(&isa, 0, sizeof(struct sockaddr_in)); |
bcce45ed |
975 | err = 0; |
976 | t = accept(s->s,&isa,&addrlen); |
977 | if (t == INVALID_SOCKET) |
978 | { |
979 | err = WSAGetLastError(); |
980 | if (err == WSATRY_AGAIN) |
981 | break; |
982 | } |
983 | |
bc4802a1 |
984 | if (s->localhost_only && |
985 | ntohl(isa.sin_addr.s_addr) != INADDR_LOOPBACK) { |
986 | closesocket(t); /* dodgy WinSock let nonlocal through */ |
987 | } else if (plug_accepting(s->plug, (void*)t)) { |
bcce45ed |
988 | closesocket(t); /* denied or error */ |
989 | } |
d74d141c |
990 | } |
2f75bae1 |
991 | } |
992 | |
993 | return 1; |
994 | } |
995 | |
996 | /* |
997 | * Each socket abstraction contains a `void *' private field in |
998 | * which the client can keep state. |
999 | */ |
32874aea |
1000 | void sk_set_private_ptr(Socket sock, void *ptr) |
1001 | { |
7e78000d |
1002 | Actual_Socket s = (Actual_Socket) sock; |
2f75bae1 |
1003 | s->private_ptr = ptr; |
1004 | } |
32874aea |
1005 | |
1006 | void *sk_get_private_ptr(Socket sock) |
1007 | { |
7e78000d |
1008 | Actual_Socket s = (Actual_Socket) sock; |
2f75bae1 |
1009 | return s->private_ptr; |
1010 | } |
1011 | |
1012 | /* |
1013 | * Special error values are returned from sk_namelookup and sk_new |
1014 | * if there's a problem. These functions extract an error message, |
1015 | * or return NULL if there's no problem. |
1016 | */ |
32874aea |
1017 | char *sk_addr_error(SockAddr addr) |
1018 | { |
2f75bae1 |
1019 | return addr->error; |
1020 | } |
32874aea |
1021 | static char *sk_tcp_socket_error(Socket sock) |
1022 | { |
7e78000d |
1023 | Actual_Socket s = (Actual_Socket) sock; |
2f75bae1 |
1024 | return s->error; |
1025 | } |
1026 | |
d74d141c |
1027 | void sk_set_frozen(Socket sock, int is_frozen) |
1028 | { |
1029 | Actual_Socket s = (Actual_Socket) sock; |
5471d09a |
1030 | if (s->frozen == is_frozen) |
1031 | return; |
d74d141c |
1032 | s->frozen = is_frozen; |
5471d09a |
1033 | if (!is_frozen && s->frozen_readable) { |
d74d141c |
1034 | char c; |
1035 | recv(s->s, &c, 1, MSG_PEEK); |
1036 | } |
5471d09a |
1037 | s->frozen_readable = 0; |
d74d141c |
1038 | } |
1039 | |
2f75bae1 |
1040 | /* |
1041 | * For Plink: enumerate all sockets currently active. |
1042 | */ |
32874aea |
1043 | SOCKET first_socket(int *state) |
1044 | { |
d2371c81 |
1045 | Actual_Socket s; |
1046 | *state = 0; |
1047 | s = index234(sktree, (*state)++); |
2f75bae1 |
1048 | return s ? s->s : INVALID_SOCKET; |
1049 | } |
32874aea |
1050 | |
1051 | SOCKET next_socket(int *state) |
1052 | { |
d2371c81 |
1053 | Actual_Socket s = index234(sktree, (*state)++); |
2f75bae1 |
1054 | return s ? s->s : INVALID_SOCKET; |
1055 | } |