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