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 | |
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 | |
3ad9d396 |
344 | void sk_getaddr(SockAddr addr, char *buf, int buflen) |
345 | { |
346 | #ifdef IPV6 |
347 | if (addr->family == AF_INET) { |
348 | #endif |
349 | struct in_addr a; |
350 | a.s_addr = htonl(addr->address); |
351 | strncpy(buf, inet_ntoa(a), buflen); |
352 | #ifdef IPV6 |
353 | } else { |
354 | FIXME; /* I don't know how to get a text form of an IPv6 address. */ |
355 | } |
356 | #endif |
357 | } |
358 | |
32874aea |
359 | void sk_addr_free(SockAddr addr) |
360 | { |
2f75bae1 |
361 | sfree(addr); |
362 | } |
363 | |
32874aea |
364 | static Plug sk_tcp_plug(Socket sock, Plug p) |
365 | { |
7e78000d |
366 | Actual_Socket s = (Actual_Socket) sock; |
367 | Plug ret = s->plug; |
32874aea |
368 | if (p) |
369 | s->plug = p; |
7e78000d |
370 | return ret; |
371 | } |
372 | |
32874aea |
373 | static void sk_tcp_flush(Socket s) |
374 | { |
7e78000d |
375 | /* |
376 | * We send data to the socket as soon as we can anyway, |
377 | * so we don't need to do anything here. :-) |
378 | */ |
379 | } |
380 | |
2d466ffd |
381 | static void sk_tcp_close(Socket s); |
5471d09a |
382 | static int sk_tcp_write(Socket s, char *data, int len); |
383 | static int sk_tcp_write_oob(Socket s, char *data, int len); |
2d466ffd |
384 | static char *sk_tcp_socket_error(Socket s); |
7e78000d |
385 | |
d74d141c |
386 | extern char *do_select(SOCKET skt, int startup); |
387 | |
388 | Socket sk_register(void *sock, Plug plug) |
389 | { |
390 | static struct socket_function_table fn_table = { |
391 | sk_tcp_plug, |
392 | sk_tcp_close, |
393 | sk_tcp_write, |
394 | sk_tcp_write_oob, |
395 | sk_tcp_flush, |
396 | sk_tcp_socket_error |
397 | }; |
398 | |
399 | DWORD err; |
400 | char *errstr; |
401 | Actual_Socket ret; |
402 | |
403 | /* |
404 | * Create Socket structure. |
405 | */ |
406 | ret = smalloc(sizeof(struct Socket_tag)); |
407 | ret->fn = &fn_table; |
408 | ret->error = NULL; |
409 | ret->plug = plug; |
5471d09a |
410 | bufchain_init(&ret->output_data); |
d74d141c |
411 | ret->writable = 1; /* to start with */ |
412 | ret->sending_oob = 0; |
413 | ret->frozen = 1; |
5471d09a |
414 | ret->frozen_readable = 0; |
bc4802a1 |
415 | ret->localhost_only = 0; /* unused, but best init anyway */ |
7732d38a |
416 | ret->pending_error = 0; |
d74d141c |
417 | |
418 | ret->s = (SOCKET)sock; |
419 | |
420 | if (ret->s == INVALID_SOCKET) { |
421 | err = WSAGetLastError(); |
422 | ret->error = winsock_error_string(err); |
423 | return (Socket) ret; |
424 | } |
425 | |
426 | ret->oobinline = 0; |
427 | |
428 | /* Set up a select mechanism. This could be an AsyncSelect on a |
429 | * window, or an EventSelect on an event object. */ |
430 | errstr = do_select(ret->s, 1); |
431 | if (errstr) { |
432 | ret->error = errstr; |
433 | return (Socket) ret; |
434 | } |
435 | |
436 | add234(sktree, ret); |
437 | |
438 | return (Socket) ret; |
439 | } |
440 | |
4b1e8acc |
441 | Socket sk_new(SockAddr addr, int port, int privport, int oobinline, |
2184a5d9 |
442 | int nodelay, Plug plug) |
7e78000d |
443 | { |
444 | static struct socket_function_table fn_table = { |
445 | sk_tcp_plug, |
446 | sk_tcp_close, |
447 | sk_tcp_write, |
448 | sk_tcp_write_oob, |
449 | sk_tcp_flush, |
450 | sk_tcp_socket_error |
451 | }; |
452 | |
2f75bae1 |
453 | SOCKET s; |
c4d8e107 |
454 | #ifdef IPV6 |
455 | SOCKADDR_IN6 a6; |
456 | #endif |
2f75bae1 |
457 | SOCKADDR_IN a; |
458 | DWORD err; |
459 | char *errstr; |
7e78000d |
460 | Actual_Socket ret; |
c91409da |
461 | short localport; |
2f75bae1 |
462 | |
463 | /* |
464 | * Create Socket structure. |
465 | */ |
466 | ret = smalloc(sizeof(struct Socket_tag)); |
7e78000d |
467 | ret->fn = &fn_table; |
2f75bae1 |
468 | ret->error = NULL; |
7e78000d |
469 | ret->plug = plug; |
5471d09a |
470 | bufchain_init(&ret->output_data); |
3ad9d396 |
471 | ret->connected = 0; /* to start with */ |
472 | ret->writable = 0; /* to start with */ |
33232c8f |
473 | ret->sending_oob = 0; |
d74d141c |
474 | ret->frozen = 0; |
5471d09a |
475 | ret->frozen_readable = 0; |
bc4802a1 |
476 | ret->localhost_only = 0; /* unused, but best init anyway */ |
7732d38a |
477 | ret->pending_error = 0; |
2f75bae1 |
478 | |
479 | /* |
480 | * Open socket. |
481 | */ |
c4d8e107 |
482 | s = socket(addr->family, SOCK_STREAM, 0); |
2f75bae1 |
483 | ret->s = s; |
484 | |
485 | if (s == INVALID_SOCKET) { |
486 | err = WSAGetLastError(); |
32874aea |
487 | ret->error = winsock_error_string(err); |
7e78000d |
488 | return (Socket) ret; |
2f75bae1 |
489 | } |
4b1e8acc |
490 | |
491 | ret->oobinline = oobinline; |
492 | if (oobinline) { |
1ad4eb6f |
493 | BOOL b = TRUE; |
32874aea |
494 | setsockopt(s, SOL_SOCKET, SO_OOBINLINE, (void *) &b, sizeof(b)); |
1ad4eb6f |
495 | } |
2f75bae1 |
496 | |
2184a5d9 |
497 | if (nodelay) { |
498 | BOOL b = TRUE; |
499 | setsockopt(s, IPPROTO_TCP, TCP_NODELAY, (void *) &b, sizeof(b)); |
500 | } |
501 | |
2f75bae1 |
502 | /* |
503 | * Bind to local address. |
504 | */ |
c91409da |
505 | if (privport) |
32874aea |
506 | localport = 1023; /* count from 1023 downwards */ |
c4d8e107 |
507 | else |
32874aea |
508 | localport = 0; /* just use port 0 (ie winsock picks) */ |
c91409da |
509 | |
510 | /* Loop round trying to bind */ |
511 | while (1) { |
32874aea |
512 | int retcode; |
c91409da |
513 | |
514 | #ifdef IPV6 |
32874aea |
515 | if (addr->family == AF_INET6) { |
516 | memset(&a6, 0, sizeof(a6)); |
517 | a6.sin6_family = AF_INET6; |
518 | /*a6.sin6_addr = in6addr_any; *//* == 0 */ |
519 | a6.sin6_port = htons(localport); |
520 | } else |
c4d8e107 |
521 | #endif |
32874aea |
522 | { |
523 | a.sin_family = AF_INET; |
524 | a.sin_addr.s_addr = htonl(INADDR_ANY); |
525 | a.sin_port = htons(localport); |
526 | } |
c4d8e107 |
527 | #ifdef IPV6 |
32874aea |
528 | retcode = bind(s, (addr->family == AF_INET6 ? |
529 | (struct sockaddr *) &a6 : |
530 | (struct sockaddr *) &a), |
531 | (addr->family == |
532 | AF_INET6 ? sizeof(a6) : sizeof(a))); |
c4d8e107 |
533 | #else |
32874aea |
534 | retcode = bind(s, (struct sockaddr *) &a, sizeof(a)); |
c4d8e107 |
535 | #endif |
32874aea |
536 | if (retcode != SOCKET_ERROR) { |
537 | err = 0; |
538 | break; /* done */ |
539 | } else { |
540 | err = WSAGetLastError(); |
541 | if (err != WSAEADDRINUSE) /* failed, for a bad reason */ |
542 | break; |
543 | } |
544 | |
545 | if (localport == 0) |
546 | break; /* we're only looping once */ |
547 | localport--; |
548 | if (localport == 0) |
549 | break; /* we might have got to the end */ |
c91409da |
550 | } |
551 | |
32874aea |
552 | if (err) { |
c4d8e107 |
553 | ret->error = winsock_error_string(err); |
7e78000d |
554 | return (Socket) ret; |
2f75bae1 |
555 | } |
556 | |
557 | /* |
558 | * Connect to remote address. |
559 | */ |
c4d8e107 |
560 | #ifdef IPV6 |
32874aea |
561 | if (addr->family == AF_INET6) { |
562 | memset(&a, 0, sizeof(a)); |
c4d8e107 |
563 | a6.sin6_family = AF_INET6; |
32874aea |
564 | a6.sin6_port = htons((short) port); |
565 | a6.sin6_addr = |
566 | ((struct sockaddr_in6 *) addr->ai->ai_addr)->sin6_addr; |
567 | } else |
c4d8e107 |
568 | #endif |
32874aea |
569 | { |
c4d8e107 |
570 | a.sin_family = AF_INET; |
571 | a.sin_addr.s_addr = htonl(addr->address); |
32874aea |
572 | a.sin_port = htons((short) port); |
c4d8e107 |
573 | } |
3ad9d396 |
574 | |
575 | /* Set up a select mechanism. This could be an AsyncSelect on a |
576 | * window, or an EventSelect on an event object. */ |
577 | errstr = do_select(s, 1); |
578 | if (errstr) { |
579 | ret->error = errstr; |
580 | return (Socket) ret; |
581 | } |
582 | |
32874aea |
583 | if (( |
584 | #ifdef IPV6 |
585 | connect(s, ((addr->family == AF_INET6) ? |
586 | (struct sockaddr *) &a6 : (struct sockaddr *) &a), |
587 | (addr->family == AF_INET6) ? sizeof(a6) : sizeof(a)) |
c4d8e107 |
588 | #else |
32874aea |
589 | connect(s, (struct sockaddr *) &a, sizeof(a)) |
c4d8e107 |
590 | #endif |
32874aea |
591 | ) == SOCKET_ERROR) { |
2f75bae1 |
592 | err = WSAGetLastError(); |
3ad9d396 |
593 | /* |
594 | * We expect a potential EWOULDBLOCK here, because the |
595 | * chances are the front end has done a select for |
596 | * FD_CONNECT, so that connect() will complete |
597 | * asynchronously. |
598 | */ |
599 | if ( err != WSAEWOULDBLOCK ) { |
600 | ret->error = winsock_error_string(err); |
601 | return (Socket) ret; |
602 | } |
603 | } else { |
604 | /* |
605 | * If we _don't_ get EWOULDBLOCK, the connect has completed |
606 | * and we should set the socket as writable. |
607 | */ |
608 | ret->writable = 1; |
2f75bae1 |
609 | } |
610 | |
611 | add234(sktree, ret); |
612 | |
7e78000d |
613 | return (Socket) ret; |
2f75bae1 |
614 | } |
615 | |
bcce45ed |
616 | Socket sk_newlistener(int port, Plug plug, int local_host_only) |
d74d141c |
617 | { |
618 | static struct socket_function_table fn_table = { |
619 | sk_tcp_plug, |
620 | sk_tcp_close, |
621 | sk_tcp_write, |
622 | sk_tcp_write_oob, |
623 | sk_tcp_flush, |
624 | sk_tcp_socket_error |
625 | }; |
626 | |
627 | SOCKET s; |
628 | #ifdef IPV6 |
629 | SOCKADDR_IN6 a6; |
630 | #endif |
631 | SOCKADDR_IN a; |
632 | DWORD err; |
633 | char *errstr; |
634 | Actual_Socket ret; |
635 | int retcode; |
636 | int on = 1; |
637 | |
638 | /* |
639 | * Create Socket structure. |
640 | */ |
641 | ret = smalloc(sizeof(struct Socket_tag)); |
642 | ret->fn = &fn_table; |
643 | ret->error = NULL; |
644 | ret->plug = plug; |
5471d09a |
645 | bufchain_init(&ret->output_data); |
d74d141c |
646 | ret->writable = 0; /* to start with */ |
647 | ret->sending_oob = 0; |
648 | ret->frozen = 0; |
5471d09a |
649 | ret->frozen_readable = 0; |
bc4802a1 |
650 | ret->localhost_only = local_host_only; |
7732d38a |
651 | ret->pending_error = 0; |
d74d141c |
652 | |
653 | /* |
654 | * Open socket. |
655 | */ |
656 | s = socket(AF_INET, SOCK_STREAM, 0); |
657 | ret->s = s; |
658 | |
659 | if (s == INVALID_SOCKET) { |
660 | err = WSAGetLastError(); |
661 | ret->error = winsock_error_string(err); |
662 | return (Socket) ret; |
663 | } |
664 | |
665 | ret->oobinline = 0; |
666 | |
667 | |
668 | setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (const char *)&on, sizeof(on)); |
669 | |
670 | |
671 | #ifdef IPV6 |
672 | if (addr->family == AF_INET6) { |
673 | memset(&a6, 0, sizeof(a6)); |
674 | a6.sin6_family = AF_INET6; |
bcce45ed |
675 | if (local_host_only) |
676 | a6.sin6_addr = in6addr_loopback; |
677 | else |
678 | a6.sin6_addr = in6addr_any; |
d74d141c |
679 | a6.sin6_port = htons(port); |
680 | } else |
681 | #endif |
682 | { |
683 | a.sin_family = AF_INET; |
bcce45ed |
684 | if (local_host_only) |
685 | a.sin_addr.s_addr = htonl(INADDR_LOOPBACK); |
686 | else |
687 | a.sin_addr.s_addr = htonl(INADDR_ANY); |
d74d141c |
688 | a.sin_port = htons((short)port); |
689 | } |
690 | #ifdef IPV6 |
691 | retcode = bind(s, (addr->family == AF_INET6 ? |
692 | (struct sockaddr *) &a6 : |
693 | (struct sockaddr *) &a), |
694 | (addr->family == |
695 | AF_INET6 ? sizeof(a6) : sizeof(a))); |
696 | #else |
697 | retcode = bind(s, (struct sockaddr *) &a, sizeof(a)); |
698 | #endif |
699 | if (retcode != SOCKET_ERROR) { |
700 | err = 0; |
701 | } else { |
702 | err = WSAGetLastError(); |
703 | } |
704 | |
705 | if (err) { |
706 | ret->error = winsock_error_string(err); |
707 | return (Socket) ret; |
708 | } |
709 | |
710 | |
711 | if (listen(s, SOMAXCONN) == SOCKET_ERROR) { |
712 | closesocket(s); |
713 | ret->error = winsock_error_string(err); |
714 | return (Socket) ret; |
715 | } |
716 | |
717 | /* Set up a select mechanism. This could be an AsyncSelect on a |
718 | * window, or an EventSelect on an event object. */ |
719 | errstr = do_select(s, 1); |
720 | if (errstr) { |
721 | ret->error = errstr; |
722 | return (Socket) ret; |
723 | } |
724 | |
725 | add234(sktree, ret); |
726 | |
727 | return (Socket) ret; |
728 | } |
729 | |
32874aea |
730 | static void sk_tcp_close(Socket sock) |
731 | { |
9c964e85 |
732 | extern char *do_select(SOCKET skt, int startup); |
7e78000d |
733 | Actual_Socket s = (Actual_Socket) sock; |
9c964e85 |
734 | |
2f75bae1 |
735 | del234(sktree, s); |
736 | do_select(s->s, 0); |
737 | closesocket(s->s); |
dcbde236 |
738 | sfree(s); |
2f75bae1 |
739 | } |
740 | |
2f75bae1 |
741 | /* |
742 | * The function which tries to send on a socket once it's deemed |
743 | * writable. |
744 | */ |
32874aea |
745 | void try_send(Actual_Socket s) |
746 | { |
5471d09a |
747 | while (s->sending_oob || bufchain_size(&s->output_data) > 0) { |
2f75bae1 |
748 | int nsent; |
749 | DWORD err; |
5471d09a |
750 | void *data; |
32874aea |
751 | int len, urgentflag; |
752 | |
753 | if (s->sending_oob) { |
754 | urgentflag = MSG_OOB; |
755 | len = s->sending_oob; |
5471d09a |
756 | data = &s->oobdata; |
32874aea |
757 | } else { |
758 | urgentflag = 0; |
5471d09a |
759 | bufchain_prefix(&s->output_data, &data, &len); |
32874aea |
760 | } |
5471d09a |
761 | nsent = send(s->s, data, len, urgentflag); |
32874aea |
762 | noise_ultralight(nsent); |
2f75bae1 |
763 | if (nsent <= 0) { |
764 | err = (nsent < 0 ? WSAGetLastError() : 0); |
e5eb3a1c |
765 | if ((err < WSABASEERR && nsent < 0) || err == WSAEWOULDBLOCK) { |
d40a94b9 |
766 | /* |
767 | * Perfectly normal: we've sent all we can for the moment. |
768 | * |
e5eb3a1c |
769 | * (Some WinSock send() implementations can return |
770 | * <0 but leave no sensible error indication - |
771 | * WSAGetLastError() is called but returns zero or |
772 | * a small number - so we check that case and treat |
773 | * it just like WSAEWOULDBLOCK.) |
d40a94b9 |
774 | */ |
2f75bae1 |
775 | s->writable = FALSE; |
32874aea |
776 | return; |
2f75bae1 |
777 | } else if (nsent == 0 || |
32874aea |
778 | err == WSAECONNABORTED || err == WSAECONNRESET) { |
779 | /* |
7732d38a |
780 | * If send() returns CONNABORTED or CONNRESET, we |
781 | * unfortunately can't just call plug_closing(), |
782 | * because it's quite likely that we're currently |
783 | * _in_ a call from the code we'd be calling back |
784 | * to, so we'd have to make half the SSH code |
785 | * reentrant. Instead we flag a pending error on |
786 | * the socket, to be dealt with (by calling |
787 | * plug_closing()) at some suitable future moment. |
32874aea |
788 | */ |
7732d38a |
789 | s->pending_error = err; |
790 | return; |
2f75bae1 |
791 | } else { |
792 | fatalbox(winsock_error_string(err)); |
793 | } |
794 | } else { |
5471d09a |
795 | if (s->sending_oob) { |
796 | if (nsent < len) { |
797 | memmove(s->oobdata, s->oobdata+nsent, len-nsent); |
798 | s->sending_oob = len - nsent; |
799 | } else { |
800 | s->sending_oob = 0; |
801 | } |
802 | } else { |
803 | bufchain_consume(&s->output_data, nsent); |
2f75bae1 |
804 | } |
805 | } |
806 | } |
807 | } |
808 | |
5471d09a |
809 | static int sk_tcp_write(Socket sock, char *buf, int len) |
32874aea |
810 | { |
7e78000d |
811 | Actual_Socket s = (Actual_Socket) sock; |
812 | |
2f75bae1 |
813 | /* |
814 | * Add the data to the buffer list on the socket. |
815 | */ |
5471d09a |
816 | bufchain_add(&s->output_data, buf, len); |
2f75bae1 |
817 | |
818 | /* |
819 | * Now try sending from the start of the buffer list. |
820 | */ |
821 | if (s->writable) |
822 | try_send(s); |
5471d09a |
823 | |
824 | return bufchain_size(&s->output_data); |
2f75bae1 |
825 | } |
826 | |
5471d09a |
827 | static int sk_tcp_write_oob(Socket sock, char *buf, int len) |
32874aea |
828 | { |
7e78000d |
829 | Actual_Socket s = (Actual_Socket) sock; |
830 | |
2f75bae1 |
831 | /* |
832 | * Replace the buffer list on the socket with the data. |
833 | */ |
5471d09a |
834 | bufchain_clear(&s->output_data); |
835 | assert(len <= sizeof(s->oobdata)); |
836 | memcpy(s->oobdata, buf, len); |
2f75bae1 |
837 | s->sending_oob = len; |
838 | |
839 | /* |
840 | * Now try sending from the start of the buffer list. |
841 | */ |
842 | if (s->writable) |
843 | try_send(s); |
5471d09a |
844 | |
845 | return s->sending_oob; |
2f75bae1 |
846 | } |
847 | |
32874aea |
848 | int select_result(WPARAM wParam, LPARAM lParam) |
849 | { |
f9d3f227 |
850 | int ret, open; |
2f75bae1 |
851 | DWORD err; |
b675c612 |
852 | char buf[20480]; /* nice big buffer for plenty of speed */ |
7e78000d |
853 | Actual_Socket s; |
49bad831 |
854 | u_long atmark; |
2f75bae1 |
855 | |
856 | /* wParam is the socket itself */ |
32874aea |
857 | s = find234(sktree, (void *) wParam, cmpforsearch); |
2f75bae1 |
858 | if (!s) |
859 | return 1; /* boggle */ |
860 | |
861 | if ((err = WSAGETSELECTERROR(lParam)) != 0) { |
32874aea |
862 | /* |
863 | * An error has occurred on this socket. Pass it to the |
864 | * plug. |
865 | */ |
866 | return plug_closing(s->plug, winsock_error_string(err), err, 0); |
2f75bae1 |
867 | } |
868 | |
7d6ee6ff |
869 | noise_ultralight(lParam); |
870 | |
2f75bae1 |
871 | switch (WSAGETSELECTEVENT(lParam)) { |
3ad9d396 |
872 | case FD_CONNECT: |
873 | s->connected = s->writable = 1; |
874 | break; |
2f75bae1 |
875 | case FD_READ: |
d74d141c |
876 | /* In the case the socket is still frozen, we don't even bother */ |
5471d09a |
877 | if (s->frozen) { |
878 | s->frozen_readable = 1; |
d74d141c |
879 | break; |
5471d09a |
880 | } |
d74d141c |
881 | |
32874aea |
882 | /* |
883 | * We have received data on the socket. For an oobinline |
884 | * socket, this might be data _before_ an urgent pointer, |
885 | * in which case we send it to the back end with type==1 |
886 | * (data prior to urgent). |
887 | */ |
888 | if (s->oobinline) { |
889 | atmark = 1; |
890 | ioctlsocket(s->s, SIOCATMARK, &atmark); |
891 | /* |
892 | * Avoid checking the return value from ioctlsocket(), |
893 | * on the grounds that some WinSock wrappers don't |
894 | * support it. If it does nothing, we get atmark==1, |
895 | * which is equivalent to `no OOB pending', so the |
896 | * effect will be to non-OOB-ify any OOB data. |
897 | */ |
898 | } else |
899 | atmark = 1; |
4b1e8acc |
900 | |
2f75bae1 |
901 | ret = recv(s->s, buf, sizeof(buf), 0); |
32874aea |
902 | noise_ultralight(ret); |
2f75bae1 |
903 | if (ret < 0) { |
904 | err = WSAGetLastError(); |
905 | if (err == WSAEWOULDBLOCK) { |
906 | break; |
907 | } |
908 | } |
909 | if (ret < 0) { |
32874aea |
910 | return plug_closing(s->plug, winsock_error_string(err), err, |
911 | 0); |
7e78000d |
912 | } else if (0 == ret) { |
32874aea |
913 | return plug_closing(s->plug, NULL, 0, 0); |
2f75bae1 |
914 | } else { |
32874aea |
915 | return plug_receive(s->plug, atmark ? 0 : 1, buf, ret); |
2f75bae1 |
916 | } |
917 | break; |
918 | case FD_OOB: |
32874aea |
919 | /* |
920 | * This will only happen on a non-oobinline socket. It |
921 | * indicates that we can immediately perform an OOB read |
922 | * and get back OOB data, which we will send to the back |
923 | * end with type==2 (urgent data). |
924 | */ |
925 | ret = recv(s->s, buf, sizeof(buf), MSG_OOB); |
926 | noise_ultralight(ret); |
927 | if (ret <= 0) { |
928 | fatalbox(ret == 0 ? "Internal networking trouble" : |
929 | winsock_error_string(WSAGetLastError())); |
930 | } else { |
931 | return plug_receive(s->plug, 2, buf, ret); |
932 | } |
933 | break; |
2f75bae1 |
934 | case FD_WRITE: |
5471d09a |
935 | { |
936 | int bufsize_before, bufsize_after; |
937 | s->writable = 1; |
938 | bufsize_before = s->sending_oob + bufchain_size(&s->output_data); |
939 | try_send(s); |
940 | bufsize_after = s->sending_oob + bufchain_size(&s->output_data); |
941 | if (bufsize_after < bufsize_before) |
942 | plug_sent(s->plug, bufsize_after); |
943 | } |
2f75bae1 |
944 | break; |
945 | case FD_CLOSE: |
f9d3f227 |
946 | /* Signal a close on the socket. First read any outstanding data. */ |
32874aea |
947 | open = 1; |
948 | do { |
949 | ret = recv(s->s, buf, sizeof(buf), 0); |
950 | if (ret < 0) { |
951 | err = WSAGetLastError(); |
952 | if (err == WSAEWOULDBLOCK) |
953 | break; |
954 | return plug_closing(s->plug, winsock_error_string(err), |
955 | err, 0); |
956 | } else { |
957 | if (ret) |
958 | open &= plug_receive(s->plug, 0, buf, ret); |
959 | else |
960 | open &= plug_closing(s->plug, NULL, 0, 0); |
7e78000d |
961 | } |
f9d3f227 |
962 | } while (ret > 0); |
32874aea |
963 | return open; |
d74d141c |
964 | case FD_ACCEPT: |
965 | { |
bc4802a1 |
966 | struct sockaddr_in isa; |
967 | int addrlen = sizeof(struct sockaddr_in); |
bcce45ed |
968 | SOCKET t; /* socket of connection */ |
969 | |
bc4802a1 |
970 | memset(&isa, 0, sizeof(struct sockaddr_in)); |
bcce45ed |
971 | err = 0; |
0e5e7f46 |
972 | t = accept(s->s,(struct sockaddr *)&isa,&addrlen); |
bcce45ed |
973 | if (t == INVALID_SOCKET) |
974 | { |
975 | err = WSAGetLastError(); |
976 | if (err == WSATRY_AGAIN) |
977 | break; |
978 | } |
979 | |
bc4802a1 |
980 | if (s->localhost_only && |
981 | ntohl(isa.sin_addr.s_addr) != INADDR_LOOPBACK) { |
982 | closesocket(t); /* dodgy WinSock let nonlocal through */ |
983 | } else if (plug_accepting(s->plug, (void*)t)) { |
bcce45ed |
984 | closesocket(t); /* denied or error */ |
985 | } |
d74d141c |
986 | } |
2f75bae1 |
987 | } |
988 | |
989 | return 1; |
990 | } |
991 | |
992 | /* |
7732d38a |
993 | * Deal with socket errors detected in try_send(). |
994 | */ |
995 | void net_pending_errors(void) |
996 | { |
997 | int i; |
998 | Actual_Socket s; |
999 | |
1000 | /* |
1001 | * This might be a fiddly business, because it's just possible |
1002 | * that handling a pending error on one socket might cause |
1003 | * others to be closed. (I can't think of any reason this might |
1004 | * happen in current SSH implementation, but to maintain |
1005 | * generality of this network layer I'll assume the worst.) |
1006 | * |
1007 | * So what we'll do is search the socket list for _one_ socket |
1008 | * with a pending error, and then handle it, and then search |
1009 | * the list again _from the beginning_. Repeat until we make a |
1010 | * pass with no socket errors present. That way we are |
1011 | * protected against the socket list changing under our feet. |
1012 | */ |
1013 | |
1014 | do { |
1015 | for (i = 0; (s = index234(sktree, i)) != NULL; i++) { |
1016 | if (s->pending_error) { |
1017 | /* |
1018 | * An error has occurred on this socket. Pass it to the |
1019 | * plug. |
1020 | */ |
1021 | plug_closing(s->plug, |
1022 | winsock_error_string(s->pending_error), |
1023 | s->pending_error, 0); |
1024 | break; |
1025 | } |
1026 | } |
1027 | } while (s); |
1028 | } |
1029 | |
1030 | /* |
2f75bae1 |
1031 | * Each socket abstraction contains a `void *' private field in |
1032 | * which the client can keep state. |
1033 | */ |
32874aea |
1034 | void sk_set_private_ptr(Socket sock, void *ptr) |
1035 | { |
7e78000d |
1036 | Actual_Socket s = (Actual_Socket) sock; |
2f75bae1 |
1037 | s->private_ptr = ptr; |
1038 | } |
32874aea |
1039 | |
1040 | void *sk_get_private_ptr(Socket sock) |
1041 | { |
7e78000d |
1042 | Actual_Socket s = (Actual_Socket) sock; |
2f75bae1 |
1043 | return s->private_ptr; |
1044 | } |
1045 | |
1046 | /* |
1047 | * Special error values are returned from sk_namelookup and sk_new |
1048 | * if there's a problem. These functions extract an error message, |
1049 | * or return NULL if there's no problem. |
1050 | */ |
32874aea |
1051 | char *sk_addr_error(SockAddr addr) |
1052 | { |
2f75bae1 |
1053 | return addr->error; |
1054 | } |
32874aea |
1055 | static char *sk_tcp_socket_error(Socket sock) |
1056 | { |
7e78000d |
1057 | Actual_Socket s = (Actual_Socket) sock; |
2f75bae1 |
1058 | return s->error; |
1059 | } |
1060 | |
d74d141c |
1061 | void sk_set_frozen(Socket sock, int is_frozen) |
1062 | { |
1063 | Actual_Socket s = (Actual_Socket) sock; |
5471d09a |
1064 | if (s->frozen == is_frozen) |
1065 | return; |
d74d141c |
1066 | s->frozen = is_frozen; |
5471d09a |
1067 | if (!is_frozen && s->frozen_readable) { |
d74d141c |
1068 | char c; |
1069 | recv(s->s, &c, 1, MSG_PEEK); |
1070 | } |
5471d09a |
1071 | s->frozen_readable = 0; |
d74d141c |
1072 | } |
1073 | |
2f75bae1 |
1074 | /* |
1075 | * For Plink: enumerate all sockets currently active. |
1076 | */ |
32874aea |
1077 | SOCKET first_socket(int *state) |
1078 | { |
d2371c81 |
1079 | Actual_Socket s; |
1080 | *state = 0; |
1081 | s = index234(sktree, (*state)++); |
2f75bae1 |
1082 | return s ? s->s : INVALID_SOCKET; |
1083 | } |
32874aea |
1084 | |
1085 | SOCKET next_socket(int *state) |
1086 | { |
d2371c81 |
1087 | Actual_Socket s = index234(sktree, (*state)++); |
2f75bae1 |
1088 | return s ? s->s : INVALID_SOCKET; |
1089 | } |