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 | |
6ee9b735 |
58 | #define ipv4_is_loopback(addr) \ |
59 | ((ntohl(addr.s_addr) & 0xFF000000L) == 0x7F000000L) |
60 | |
2f75bae1 |
61 | struct Socket_tag { |
c85623f9 |
62 | const struct socket_function_table *fn; |
7e78000d |
63 | /* the above variable absolutely *must* be the first in this structure */ |
2f75bae1 |
64 | char *error; |
65 | SOCKET s; |
7e78000d |
66 | Plug plug; |
2f75bae1 |
67 | void *private_ptr; |
5471d09a |
68 | bufchain output_data; |
3ad9d396 |
69 | int connected; |
2f75bae1 |
70 | int writable; |
5471d09a |
71 | int frozen; /* this causes readability notifications to be ignored */ |
72 | int frozen_readable; /* this means we missed at least one readability |
73 | * notification while we were frozen */ |
bc4802a1 |
74 | int localhost_only; /* for listening sockets */ |
5471d09a |
75 | char oobdata[1]; |
1ad4eb6f |
76 | int sending_oob; |
4b1e8acc |
77 | int oobinline; |
7732d38a |
78 | int pending_error; /* in case send() returns error */ |
2f75bae1 |
79 | }; |
80 | |
7e78000d |
81 | /* |
82 | * We used to typedef struct Socket_tag *Socket. |
83 | * |
84 | * Since we have made the networking abstraction slightly more |
85 | * abstract, Socket no longer means a tcp socket (it could mean |
86 | * an ssl socket). So now we must use Actual_Socket when we know |
87 | * we are talking about a tcp socket. |
88 | */ |
89 | typedef struct Socket_tag *Actual_Socket; |
90 | |
2f75bae1 |
91 | struct SockAddr_tag { |
92 | char *error; |
b7a189f3 |
93 | /* |
94 | * Which address family this address belongs to. AF_INET for |
95 | * IPv4; AF_INET6 for IPv6; AF_UNSPEC indicates that name |
96 | * resolution has not been done and a simple host name is held |
97 | * in this SockAddr structure. |
98 | */ |
32874aea |
99 | int family; |
c4d8e107 |
100 | unsigned long address; /* Address IPv4 style. */ |
101 | #ifdef IPV6 |
102 | struct addrinfo *ai; /* Address IPv6 style. */ |
103 | #endif |
b7a189f3 |
104 | char hostname[512]; /* Store an unresolved host name. */ |
2f75bae1 |
105 | }; |
106 | |
2f75bae1 |
107 | static tree234 *sktree; |
108 | |
32874aea |
109 | static int cmpfortree(void *av, void *bv) |
110 | { |
111 | Actual_Socket a = (Actual_Socket) av, b = (Actual_Socket) bv; |
112 | unsigned long as = (unsigned long) a->s, bs = (unsigned long) b->s; |
113 | if (as < bs) |
114 | return -1; |
115 | if (as > bs) |
116 | return +1; |
2f75bae1 |
117 | return 0; |
118 | } |
119 | |
32874aea |
120 | static int cmpforsearch(void *av, void *bv) |
121 | { |
122 | Actual_Socket b = (Actual_Socket) bv; |
123 | unsigned long as = (unsigned long) av, bs = (unsigned long) b->s; |
124 | if (as < bs) |
125 | return -1; |
126 | if (as > bs) |
127 | return +1; |
2f75bae1 |
128 | return 0; |
129 | } |
130 | |
32874aea |
131 | void sk_init(void) |
132 | { |
2f75bae1 |
133 | sktree = newtree234(cmpfortree); |
134 | } |
135 | |
93b581bd |
136 | void sk_cleanup(void) |
137 | { |
138 | Actual_Socket s; |
139 | int i; |
140 | |
141 | if (sktree) { |
142 | for (i = 0; (s = index234(sktree, i)) != NULL; i++) { |
143 | closesocket(s->s); |
144 | } |
145 | } |
146 | } |
147 | |
32874aea |
148 | char *winsock_error_string(int error) |
149 | { |
e74fbad9 |
150 | switch (error) { |
32874aea |
151 | case WSAEACCES: |
152 | return "Network error: Permission denied"; |
153 | case WSAEADDRINUSE: |
154 | return "Network error: Address already in use"; |
155 | case WSAEADDRNOTAVAIL: |
156 | return "Network error: Cannot assign requested address"; |
157 | case WSAEAFNOSUPPORT: |
158 | return |
159 | "Network error: Address family not supported by protocol family"; |
160 | case WSAEALREADY: |
161 | return "Network error: Operation already in progress"; |
162 | case WSAECONNABORTED: |
163 | return "Network error: Software caused connection abort"; |
164 | case WSAECONNREFUSED: |
165 | return "Network error: Connection refused"; |
166 | case WSAECONNRESET: |
167 | return "Network error: Connection reset by peer"; |
168 | case WSAEDESTADDRREQ: |
169 | return "Network error: Destination address required"; |
170 | case WSAEFAULT: |
171 | return "Network error: Bad address"; |
172 | case WSAEHOSTDOWN: |
173 | return "Network error: Host is down"; |
174 | case WSAEHOSTUNREACH: |
175 | return "Network error: No route to host"; |
176 | case WSAEINPROGRESS: |
177 | return "Network error: Operation now in progress"; |
178 | case WSAEINTR: |
179 | return "Network error: Interrupted function call"; |
180 | case WSAEINVAL: |
181 | return "Network error: Invalid argument"; |
182 | case WSAEISCONN: |
183 | return "Network error: Socket is already connected"; |
184 | case WSAEMFILE: |
185 | return "Network error: Too many open files"; |
186 | case WSAEMSGSIZE: |
187 | return "Network error: Message too long"; |
188 | case WSAENETDOWN: |
189 | return "Network error: Network is down"; |
190 | case WSAENETRESET: |
191 | return "Network error: Network dropped connection on reset"; |
192 | case WSAENETUNREACH: |
193 | return "Network error: Network is unreachable"; |
194 | case WSAENOBUFS: |
195 | return "Network error: No buffer space available"; |
196 | case WSAENOPROTOOPT: |
197 | return "Network error: Bad protocol option"; |
198 | case WSAENOTCONN: |
199 | return "Network error: Socket is not connected"; |
200 | case WSAENOTSOCK: |
201 | return "Network error: Socket operation on non-socket"; |
202 | case WSAEOPNOTSUPP: |
203 | return "Network error: Operation not supported"; |
204 | case WSAEPFNOSUPPORT: |
205 | return "Network error: Protocol family not supported"; |
206 | case WSAEPROCLIM: |
207 | return "Network error: Too many processes"; |
208 | case WSAEPROTONOSUPPORT: |
209 | return "Network error: Protocol not supported"; |
210 | case WSAEPROTOTYPE: |
211 | return "Network error: Protocol wrong type for socket"; |
212 | case WSAESHUTDOWN: |
213 | return "Network error: Cannot send after socket shutdown"; |
214 | case WSAESOCKTNOSUPPORT: |
215 | return "Network error: Socket type not supported"; |
216 | case WSAETIMEDOUT: |
217 | return "Network error: Connection timed out"; |
218 | case WSAEWOULDBLOCK: |
219 | return "Network error: Resource temporarily unavailable"; |
220 | case WSAEDISCON: |
221 | return "Network error: Graceful shutdown in progress"; |
222 | default: |
223 | return "Unknown network error"; |
e74fbad9 |
224 | } |
225 | } |
226 | |
e8fa8f62 |
227 | SockAddr sk_namelookup(const char *host, char **canonicalname) |
c4d8e107 |
228 | { |
2f75bae1 |
229 | SockAddr ret = smalloc(sizeof(struct SockAddr_tag)); |
230 | unsigned long a; |
c4d8e107 |
231 | struct hostent *h = NULL; |
6e1ebb76 |
232 | char realhost[8192]; |
2f75bae1 |
233 | |
c4d8e107 |
234 | /* Clear the structure and default to IPv4. */ |
235 | memset(ret, 0, sizeof(struct SockAddr_tag)); |
236 | ret->family = 0; /* We set this one when we have resolved the host. */ |
6e1ebb76 |
237 | *realhost = '\0'; |
c4d8e107 |
238 | |
32874aea |
239 | if ((a = inet_addr(host)) == (unsigned long) INADDR_NONE) { |
c4d8e107 |
240 | #ifdef IPV6 |
241 | |
242 | /* Try to get the getaddrinfo() function from wship6.dll */ |
243 | /* This way one doesn't need to have IPv6 dll's to use PuTTY and |
244 | * it will fallback to IPv4. */ |
32874aea |
245 | typedef int (CALLBACK * FGETADDRINFO) (const char *nodename, |
246 | const char *servname, |
247 | const struct addrinfo * |
248 | hints, |
249 | struct addrinfo ** res); |
c4d8e107 |
250 | FGETADDRINFO fGetAddrInfo = NULL; |
251 | |
252 | HINSTANCE dllWSHIP6 = LoadLibrary("wship6.dll"); |
253 | if (dllWSHIP6) |
32874aea |
254 | fGetAddrInfo = (FGETADDRINFO) GetProcAddress(dllWSHIP6, |
255 | "getaddrinfo"); |
c4d8e107 |
256 | |
257 | /* |
258 | * Use fGetAddrInfo when it's available (which usually also |
259 | * means IPv6 is installed...) |
260 | */ |
32874aea |
261 | if (fGetAddrInfo) { |
c4d8e107 |
262 | /*debug(("Resolving \"%s\" with getaddrinfo() (IPv4+IPv6 capable)...\n", host)); */ |
263 | if (fGetAddrInfo(host, NULL, NULL, &ret->ai) == 0) |
264 | ret->family = ret->ai->ai_family; |
32874aea |
265 | } else |
c4d8e107 |
266 | #endif |
32874aea |
267 | { |
c4d8e107 |
268 | /* |
269 | * Otherwise use the IPv4-only gethostbyname... |
270 | * (NOTE: we don't use gethostbyname as a |
271 | * fallback!) |
272 | */ |
32874aea |
273 | if (ret->family == 0) { |
274 | /*debug(("Resolving \"%s\" with gethostbyname() (IPv4 only)...\n", host)); */ |
2d466ffd |
275 | if ( (h = gethostbyname(host)) ) |
32874aea |
276 | ret->family = AF_INET; |
277 | } |
c4d8e107 |
278 | } |
279 | /*debug(("Done resolving...(family is %d) AF_INET = %d, AF_INET6 = %d\n", ret->family, AF_INET, AF_INET6)); */ |
280 | |
32874aea |
281 | if (ret->family == 0) { |
2f75bae1 |
282 | DWORD err = WSAGetLastError(); |
c4d8e107 |
283 | ret->error = (err == WSAENETDOWN ? "Network is down" : |
32874aea |
284 | err == |
285 | WSAHOST_NOT_FOUND ? "Host does not exist" : err |
286 | == WSATRY_AGAIN ? "Host not found" : |
c4d8e107 |
287 | #ifdef IPV6 |
288 | fGetAddrInfo ? "getaddrinfo: unknown error" : |
289 | #endif |
290 | "gethostbyname: unknown error"); |
291 | #ifdef DEBUG |
292 | { |
293 | LPVOID lpMsgBuf; |
32874aea |
294 | FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | |
295 | FORMAT_MESSAGE_FROM_SYSTEM | |
296 | FORMAT_MESSAGE_IGNORE_INSERTS, NULL, err, |
297 | MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), |
298 | (LPTSTR) & lpMsgBuf, 0, NULL); |
299 | /*debug(("Error %ld: %s (h=%lx)\n", err, lpMsgBuf, h)); */ |
c4d8e107 |
300 | /* Free the buffer. */ |
301 | LocalFree(lpMsgBuf); |
302 | } |
303 | #endif |
32874aea |
304 | } else { |
c4d8e107 |
305 | ret->error = NULL; |
306 | |
307 | #ifdef IPV6 |
308 | /* If we got an address info use that... */ |
32874aea |
309 | if (ret->ai) { |
310 | typedef int (CALLBACK * FGETNAMEINFO) |
311 | (const struct sockaddr FAR * sa, socklen_t salen, |
312 | char FAR * host, size_t hostlen, char FAR * serv, |
313 | size_t servlen, int flags); |
c4d8e107 |
314 | FGETNAMEINFO fGetNameInfo = NULL; |
315 | |
316 | /* Are we in IPv4 fallback mode? */ |
317 | /* We put the IPv4 address into the a variable so we can further-on use the IPv4 code... */ |
318 | if (ret->family == AF_INET) |
32874aea |
319 | memcpy(&a, |
320 | (char *) &((SOCKADDR_IN *) ret->ai-> |
321 | ai_addr)->sin_addr, sizeof(a)); |
c4d8e107 |
322 | |
323 | /* Now let's find that canonicalname... */ |
32874aea |
324 | if ((dllWSHIP6) |
325 | && (fGetNameInfo = |
326 | (FGETNAMEINFO) GetProcAddress(dllWSHIP6, |
327 | "getnameinfo"))) { |
328 | if (fGetNameInfo |
329 | ((struct sockaddr *) ret->ai->ai_addr, |
330 | ret->family == |
331 | AF_INET ? sizeof(SOCKADDR_IN) : |
6e1ebb76 |
332 | sizeof(SOCKADDR_IN6), realhost, |
333 | sizeof(realhost), NULL, 0, 0) != 0) { |
334 | strncpy(realhost, host, sizeof(realhost)); |
c4d8e107 |
335 | } |
336 | } |
337 | } |
338 | /* We used the IPv4-only gethostbyname()... */ |
339 | else |
c4d8e107 |
340 | #endif |
32874aea |
341 | { |
c4d8e107 |
342 | memcpy(&a, h->h_addr, sizeof(a)); |
343 | /* This way we are always sure the h->h_name is valid :) */ |
6e1ebb76 |
344 | strncpy(realhost, h->h_name, sizeof(realhost)); |
c4d8e107 |
345 | } |
c4d8e107 |
346 | } |
347 | #ifdef IPV6 |
348 | FreeLibrary(dllWSHIP6); |
349 | #endif |
32874aea |
350 | } else { |
87ed061f |
351 | /* |
352 | * This must be a numeric IPv4 address because it caused a |
353 | * success return from inet_addr. |
354 | */ |
32874aea |
355 | ret->family = AF_INET; |
6e1ebb76 |
356 | strncpy(realhost, host, sizeof(realhost)); |
2f75bae1 |
357 | } |
358 | ret->address = ntohl(a); |
6e1ebb76 |
359 | realhost[lenof(realhost)-1] = '\0'; |
360 | *canonicalname = smalloc(1+strlen(realhost)); |
361 | strcpy(*canonicalname, realhost); |
2f75bae1 |
362 | return ret; |
363 | } |
364 | |
e8fa8f62 |
365 | SockAddr sk_nonamelookup(const char *host) |
b7a189f3 |
366 | { |
367 | SockAddr ret = smalloc(sizeof(struct SockAddr_tag)); |
ab0873ab |
368 | ret->error = NULL; |
b7a189f3 |
369 | ret->family = AF_UNSPEC; |
370 | strncpy(ret->hostname, host, lenof(ret->hostname)); |
371 | ret->hostname[lenof(ret->hostname)-1] = '\0'; |
372 | return ret; |
373 | } |
374 | |
3ad9d396 |
375 | void sk_getaddr(SockAddr addr, char *buf, int buflen) |
376 | { |
377 | #ifdef IPV6 |
b7a189f3 |
378 | if (addr->family == AF_INET6) { |
379 | FIXME; /* I don't know how to get a text form of an IPv6 address. */ |
380 | } else |
3ad9d396 |
381 | #endif |
b7a189f3 |
382 | if (addr->family == AF_INET) { |
3ad9d396 |
383 | struct in_addr a; |
384 | a.s_addr = htonl(addr->address); |
385 | strncpy(buf, inet_ntoa(a), buflen); |
b7a189f3 |
386 | buf[buflen-1] = '\0'; |
3ad9d396 |
387 | } else { |
b7a189f3 |
388 | assert(addr->family == AF_UNSPEC); |
389 | strncpy(buf, addr->hostname, buflen); |
390 | buf[buflen-1] = '\0'; |
3ad9d396 |
391 | } |
3ad9d396 |
392 | } |
393 | |
b804e1e5 |
394 | int sk_hostname_is_local(char *name) |
395 | { |
396 | return !strcmp(name, "localhost"); |
397 | } |
398 | |
399 | int sk_address_is_local(SockAddr addr) |
400 | { |
401 | #ifdef IPV6 |
b7a189f3 |
402 | if (addr->family == AF_INET6) { |
403 | FIXME; /* someone who can compile for IPV6 had better do this bit */ |
404 | } else |
b804e1e5 |
405 | #endif |
b7a189f3 |
406 | if (addr->family == AF_INET) { |
b804e1e5 |
407 | struct in_addr a; |
408 | a.s_addr = htonl(addr->address); |
409 | return ipv4_is_loopback(a); |
b804e1e5 |
410 | } else { |
b7a189f3 |
411 | assert(addr->family == AF_UNSPEC); |
412 | return 0; /* we don't know; assume not */ |
b804e1e5 |
413 | } |
b804e1e5 |
414 | } |
415 | |
6971bbe7 |
416 | int sk_addrtype(SockAddr addr) |
417 | { |
b7a189f3 |
418 | return (addr->family == AF_INET ? ADDRTYPE_IPV4 : |
419 | #ifdef IPV6 |
420 | addr->family == AF_INET6 ? ADDRTYPE_IPV6 : |
421 | #endif |
422 | ADDRTYPE_NAME); |
6971bbe7 |
423 | } |
424 | |
425 | void sk_addrcopy(SockAddr addr, char *buf) |
426 | { |
b7a189f3 |
427 | assert(addr->family != AF_UNSPEC); |
6971bbe7 |
428 | #ifdef IPV6 |
b7a189f3 |
429 | if (addr->family == AF_INET6) { |
430 | memcpy(buf, (char*) addr->ai, 16); |
431 | } else |
6971bbe7 |
432 | #endif |
b7a189f3 |
433 | if (addr->family == AF_INET) { |
6971bbe7 |
434 | struct in_addr a; |
435 | a.s_addr = htonl(addr->address); |
96d9eb89 |
436 | memcpy(buf, (char*) &a.s_addr, 4); |
6971bbe7 |
437 | } |
6971bbe7 |
438 | } |
439 | |
32874aea |
440 | void sk_addr_free(SockAddr addr) |
441 | { |
2f75bae1 |
442 | sfree(addr); |
443 | } |
444 | |
32874aea |
445 | static Plug sk_tcp_plug(Socket sock, Plug p) |
446 | { |
7e78000d |
447 | Actual_Socket s = (Actual_Socket) sock; |
448 | Plug ret = s->plug; |
32874aea |
449 | if (p) |
450 | s->plug = p; |
7e78000d |
451 | return ret; |
452 | } |
453 | |
32874aea |
454 | static void sk_tcp_flush(Socket s) |
455 | { |
7e78000d |
456 | /* |
457 | * We send data to the socket as soon as we can anyway, |
458 | * so we don't need to do anything here. :-) |
459 | */ |
460 | } |
461 | |
2d466ffd |
462 | static void sk_tcp_close(Socket s); |
e0e7dff8 |
463 | static int sk_tcp_write(Socket s, const char *data, int len); |
464 | static int sk_tcp_write_oob(Socket s, const char *data, int len); |
8eebd221 |
465 | static void sk_tcp_set_private_ptr(Socket s, void *ptr); |
466 | static void *sk_tcp_get_private_ptr(Socket s); |
467 | static void sk_tcp_set_frozen(Socket s, int is_frozen); |
2d466ffd |
468 | static char *sk_tcp_socket_error(Socket s); |
7e78000d |
469 | |
d74d141c |
470 | extern char *do_select(SOCKET skt, int startup); |
471 | |
472 | Socket sk_register(void *sock, Plug plug) |
473 | { |
c85623f9 |
474 | static const struct socket_function_table fn_table = { |
d74d141c |
475 | sk_tcp_plug, |
476 | sk_tcp_close, |
477 | sk_tcp_write, |
478 | sk_tcp_write_oob, |
479 | sk_tcp_flush, |
8eebd221 |
480 | sk_tcp_set_private_ptr, |
481 | sk_tcp_get_private_ptr, |
482 | sk_tcp_set_frozen, |
d74d141c |
483 | sk_tcp_socket_error |
484 | }; |
485 | |
486 | DWORD err; |
487 | char *errstr; |
488 | Actual_Socket ret; |
489 | |
490 | /* |
491 | * Create Socket structure. |
492 | */ |
493 | ret = smalloc(sizeof(struct Socket_tag)); |
494 | ret->fn = &fn_table; |
495 | ret->error = NULL; |
496 | ret->plug = plug; |
5471d09a |
497 | bufchain_init(&ret->output_data); |
d74d141c |
498 | ret->writable = 1; /* to start with */ |
499 | ret->sending_oob = 0; |
500 | ret->frozen = 1; |
5471d09a |
501 | ret->frozen_readable = 0; |
bc4802a1 |
502 | ret->localhost_only = 0; /* unused, but best init anyway */ |
7732d38a |
503 | ret->pending_error = 0; |
d74d141c |
504 | |
505 | ret->s = (SOCKET)sock; |
506 | |
507 | if (ret->s == INVALID_SOCKET) { |
508 | err = WSAGetLastError(); |
509 | ret->error = winsock_error_string(err); |
510 | return (Socket) ret; |
511 | } |
512 | |
513 | ret->oobinline = 0; |
514 | |
515 | /* Set up a select mechanism. This could be an AsyncSelect on a |
516 | * window, or an EventSelect on an event object. */ |
517 | errstr = do_select(ret->s, 1); |
518 | if (errstr) { |
519 | ret->error = errstr; |
520 | return (Socket) ret; |
521 | } |
522 | |
523 | add234(sktree, ret); |
524 | |
525 | return (Socket) ret; |
526 | } |
527 | |
4b1e8acc |
528 | Socket sk_new(SockAddr addr, int port, int privport, int oobinline, |
2184a5d9 |
529 | int nodelay, Plug plug) |
7e78000d |
530 | { |
c85623f9 |
531 | static const struct socket_function_table fn_table = { |
7e78000d |
532 | sk_tcp_plug, |
533 | sk_tcp_close, |
534 | sk_tcp_write, |
535 | sk_tcp_write_oob, |
536 | sk_tcp_flush, |
8eebd221 |
537 | sk_tcp_set_private_ptr, |
538 | sk_tcp_get_private_ptr, |
539 | sk_tcp_set_frozen, |
7e78000d |
540 | sk_tcp_socket_error |
541 | }; |
542 | |
2f75bae1 |
543 | SOCKET s; |
c4d8e107 |
544 | #ifdef IPV6 |
545 | SOCKADDR_IN6 a6; |
546 | #endif |
2f75bae1 |
547 | SOCKADDR_IN a; |
548 | DWORD err; |
549 | char *errstr; |
7e78000d |
550 | Actual_Socket ret; |
c91409da |
551 | short localport; |
2f75bae1 |
552 | |
553 | /* |
554 | * Create Socket structure. |
555 | */ |
556 | ret = smalloc(sizeof(struct Socket_tag)); |
7e78000d |
557 | ret->fn = &fn_table; |
2f75bae1 |
558 | ret->error = NULL; |
7e78000d |
559 | ret->plug = plug; |
5471d09a |
560 | bufchain_init(&ret->output_data); |
3ad9d396 |
561 | ret->connected = 0; /* to start with */ |
562 | ret->writable = 0; /* to start with */ |
33232c8f |
563 | ret->sending_oob = 0; |
d74d141c |
564 | ret->frozen = 0; |
5471d09a |
565 | ret->frozen_readable = 0; |
bc4802a1 |
566 | ret->localhost_only = 0; /* unused, but best init anyway */ |
7732d38a |
567 | ret->pending_error = 0; |
2f75bae1 |
568 | |
569 | /* |
570 | * Open socket. |
571 | */ |
b7a189f3 |
572 | assert(addr->family != AF_UNSPEC); |
c4d8e107 |
573 | s = socket(addr->family, SOCK_STREAM, 0); |
2f75bae1 |
574 | ret->s = s; |
575 | |
576 | if (s == INVALID_SOCKET) { |
577 | err = WSAGetLastError(); |
32874aea |
578 | ret->error = winsock_error_string(err); |
7e78000d |
579 | return (Socket) ret; |
2f75bae1 |
580 | } |
4b1e8acc |
581 | |
582 | ret->oobinline = oobinline; |
583 | if (oobinline) { |
1ad4eb6f |
584 | BOOL b = TRUE; |
32874aea |
585 | setsockopt(s, SOL_SOCKET, SO_OOBINLINE, (void *) &b, sizeof(b)); |
1ad4eb6f |
586 | } |
2f75bae1 |
587 | |
2184a5d9 |
588 | if (nodelay) { |
589 | BOOL b = TRUE; |
590 | setsockopt(s, IPPROTO_TCP, TCP_NODELAY, (void *) &b, sizeof(b)); |
591 | } |
592 | |
2f75bae1 |
593 | /* |
594 | * Bind to local address. |
595 | */ |
c91409da |
596 | if (privport) |
32874aea |
597 | localport = 1023; /* count from 1023 downwards */ |
c4d8e107 |
598 | else |
32874aea |
599 | localport = 0; /* just use port 0 (ie winsock picks) */ |
c91409da |
600 | |
601 | /* Loop round trying to bind */ |
602 | while (1) { |
32874aea |
603 | int retcode; |
c91409da |
604 | |
605 | #ifdef IPV6 |
32874aea |
606 | if (addr->family == AF_INET6) { |
607 | memset(&a6, 0, sizeof(a6)); |
608 | a6.sin6_family = AF_INET6; |
609 | /*a6.sin6_addr = in6addr_any; *//* == 0 */ |
610 | a6.sin6_port = htons(localport); |
611 | } else |
c4d8e107 |
612 | #endif |
32874aea |
613 | { |
614 | a.sin_family = AF_INET; |
615 | a.sin_addr.s_addr = htonl(INADDR_ANY); |
616 | a.sin_port = htons(localport); |
617 | } |
c4d8e107 |
618 | #ifdef IPV6 |
32874aea |
619 | retcode = bind(s, (addr->family == AF_INET6 ? |
620 | (struct sockaddr *) &a6 : |
621 | (struct sockaddr *) &a), |
622 | (addr->family == |
623 | AF_INET6 ? sizeof(a6) : sizeof(a))); |
c4d8e107 |
624 | #else |
32874aea |
625 | retcode = bind(s, (struct sockaddr *) &a, sizeof(a)); |
c4d8e107 |
626 | #endif |
32874aea |
627 | if (retcode != SOCKET_ERROR) { |
628 | err = 0; |
629 | break; /* done */ |
630 | } else { |
631 | err = WSAGetLastError(); |
632 | if (err != WSAEADDRINUSE) /* failed, for a bad reason */ |
633 | break; |
634 | } |
635 | |
636 | if (localport == 0) |
637 | break; /* we're only looping once */ |
638 | localport--; |
639 | if (localport == 0) |
640 | break; /* we might have got to the end */ |
c91409da |
641 | } |
642 | |
32874aea |
643 | if (err) { |
c4d8e107 |
644 | ret->error = winsock_error_string(err); |
7e78000d |
645 | return (Socket) ret; |
2f75bae1 |
646 | } |
647 | |
648 | /* |
649 | * Connect to remote address. |
650 | */ |
c4d8e107 |
651 | #ifdef IPV6 |
32874aea |
652 | if (addr->family == AF_INET6) { |
653 | memset(&a, 0, sizeof(a)); |
c4d8e107 |
654 | a6.sin6_family = AF_INET6; |
32874aea |
655 | a6.sin6_port = htons((short) port); |
656 | a6.sin6_addr = |
657 | ((struct sockaddr_in6 *) addr->ai->ai_addr)->sin6_addr; |
658 | } else |
c4d8e107 |
659 | #endif |
32874aea |
660 | { |
c4d8e107 |
661 | a.sin_family = AF_INET; |
662 | a.sin_addr.s_addr = htonl(addr->address); |
32874aea |
663 | a.sin_port = htons((short) port); |
c4d8e107 |
664 | } |
3ad9d396 |
665 | |
666 | /* Set up a select mechanism. This could be an AsyncSelect on a |
667 | * window, or an EventSelect on an event object. */ |
668 | errstr = do_select(s, 1); |
669 | if (errstr) { |
670 | ret->error = errstr; |
671 | return (Socket) ret; |
672 | } |
673 | |
32874aea |
674 | if (( |
675 | #ifdef IPV6 |
676 | connect(s, ((addr->family == AF_INET6) ? |
677 | (struct sockaddr *) &a6 : (struct sockaddr *) &a), |
678 | (addr->family == AF_INET6) ? sizeof(a6) : sizeof(a)) |
c4d8e107 |
679 | #else |
32874aea |
680 | connect(s, (struct sockaddr *) &a, sizeof(a)) |
c4d8e107 |
681 | #endif |
32874aea |
682 | ) == SOCKET_ERROR) { |
2f75bae1 |
683 | err = WSAGetLastError(); |
3ad9d396 |
684 | /* |
685 | * We expect a potential EWOULDBLOCK here, because the |
686 | * chances are the front end has done a select for |
687 | * FD_CONNECT, so that connect() will complete |
688 | * asynchronously. |
689 | */ |
690 | if ( err != WSAEWOULDBLOCK ) { |
691 | ret->error = winsock_error_string(err); |
692 | return (Socket) ret; |
693 | } |
694 | } else { |
695 | /* |
696 | * If we _don't_ get EWOULDBLOCK, the connect has completed |
697 | * and we should set the socket as writable. |
698 | */ |
699 | ret->writable = 1; |
2f75bae1 |
700 | } |
701 | |
702 | add234(sktree, ret); |
703 | |
7e78000d |
704 | return (Socket) ret; |
2f75bae1 |
705 | } |
706 | |
6ee9b735 |
707 | Socket sk_newlistener(char *srcaddr, int port, Plug plug, int local_host_only) |
d74d141c |
708 | { |
c85623f9 |
709 | static const struct socket_function_table fn_table = { |
d74d141c |
710 | sk_tcp_plug, |
711 | sk_tcp_close, |
712 | sk_tcp_write, |
713 | sk_tcp_write_oob, |
714 | sk_tcp_flush, |
8eebd221 |
715 | sk_tcp_set_private_ptr, |
716 | sk_tcp_get_private_ptr, |
717 | sk_tcp_set_frozen, |
d74d141c |
718 | sk_tcp_socket_error |
719 | }; |
720 | |
721 | SOCKET s; |
722 | #ifdef IPV6 |
723 | SOCKADDR_IN6 a6; |
724 | #endif |
725 | SOCKADDR_IN a; |
726 | DWORD err; |
727 | char *errstr; |
728 | Actual_Socket ret; |
729 | int retcode; |
730 | int on = 1; |
731 | |
732 | /* |
733 | * Create Socket structure. |
734 | */ |
735 | ret = smalloc(sizeof(struct Socket_tag)); |
736 | ret->fn = &fn_table; |
737 | ret->error = NULL; |
738 | ret->plug = plug; |
5471d09a |
739 | bufchain_init(&ret->output_data); |
d74d141c |
740 | ret->writable = 0; /* to start with */ |
741 | ret->sending_oob = 0; |
742 | ret->frozen = 0; |
5471d09a |
743 | ret->frozen_readable = 0; |
bc4802a1 |
744 | ret->localhost_only = local_host_only; |
7732d38a |
745 | ret->pending_error = 0; |
d74d141c |
746 | |
747 | /* |
748 | * Open socket. |
749 | */ |
750 | s = socket(AF_INET, SOCK_STREAM, 0); |
751 | ret->s = s; |
752 | |
753 | if (s == INVALID_SOCKET) { |
754 | err = WSAGetLastError(); |
755 | ret->error = winsock_error_string(err); |
756 | return (Socket) ret; |
757 | } |
758 | |
759 | ret->oobinline = 0; |
760 | |
d74d141c |
761 | setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (const char *)&on, sizeof(on)); |
762 | |
d74d141c |
763 | #ifdef IPV6 |
764 | if (addr->family == AF_INET6) { |
765 | memset(&a6, 0, sizeof(a6)); |
766 | a6.sin6_family = AF_INET6; |
6ee9b735 |
767 | /* FIXME: srcaddr is ignored for IPv6, because I (SGT) don't |
768 | * know how to do it. :-) */ |
bcce45ed |
769 | if (local_host_only) |
770 | a6.sin6_addr = in6addr_loopback; |
771 | else |
772 | a6.sin6_addr = in6addr_any; |
d74d141c |
773 | a6.sin6_port = htons(port); |
774 | } else |
775 | #endif |
776 | { |
6ee9b735 |
777 | int got_addr = 0; |
d74d141c |
778 | a.sin_family = AF_INET; |
6ee9b735 |
779 | |
780 | /* |
781 | * Bind to source address. First try an explicitly |
782 | * specified one... |
783 | */ |
784 | if (srcaddr) { |
785 | a.sin_addr.s_addr = inet_addr(srcaddr); |
786 | if (a.sin_addr.s_addr != INADDR_NONE) { |
787 | /* Override localhost_only with specified listen addr. */ |
788 | ret->localhost_only = ipv4_is_loopback(a.sin_addr); |
789 | got_addr = 1; |
790 | } |
791 | } |
792 | |
793 | /* |
794 | * ... and failing that, go with one of the standard ones. |
795 | */ |
796 | if (!got_addr) { |
797 | if (local_host_only) |
798 | a.sin_addr.s_addr = htonl(INADDR_LOOPBACK); |
799 | else |
800 | a.sin_addr.s_addr = htonl(INADDR_ANY); |
801 | } |
802 | |
d74d141c |
803 | a.sin_port = htons((short)port); |
804 | } |
805 | #ifdef IPV6 |
806 | retcode = bind(s, (addr->family == AF_INET6 ? |
807 | (struct sockaddr *) &a6 : |
808 | (struct sockaddr *) &a), |
809 | (addr->family == |
810 | AF_INET6 ? sizeof(a6) : sizeof(a))); |
811 | #else |
812 | retcode = bind(s, (struct sockaddr *) &a, sizeof(a)); |
813 | #endif |
814 | if (retcode != SOCKET_ERROR) { |
815 | err = 0; |
816 | } else { |
817 | err = WSAGetLastError(); |
818 | } |
819 | |
820 | if (err) { |
821 | ret->error = winsock_error_string(err); |
822 | return (Socket) ret; |
823 | } |
824 | |
825 | |
826 | if (listen(s, SOMAXCONN) == SOCKET_ERROR) { |
827 | closesocket(s); |
828 | ret->error = winsock_error_string(err); |
829 | return (Socket) ret; |
830 | } |
831 | |
832 | /* Set up a select mechanism. This could be an AsyncSelect on a |
833 | * window, or an EventSelect on an event object. */ |
834 | errstr = do_select(s, 1); |
835 | if (errstr) { |
836 | ret->error = errstr; |
837 | return (Socket) ret; |
838 | } |
839 | |
840 | add234(sktree, ret); |
841 | |
842 | return (Socket) ret; |
843 | } |
844 | |
32874aea |
845 | static void sk_tcp_close(Socket sock) |
846 | { |
9c964e85 |
847 | extern char *do_select(SOCKET skt, int startup); |
7e78000d |
848 | Actual_Socket s = (Actual_Socket) sock; |
9c964e85 |
849 | |
2f75bae1 |
850 | del234(sktree, s); |
851 | do_select(s->s, 0); |
852 | closesocket(s->s); |
dcbde236 |
853 | sfree(s); |
2f75bae1 |
854 | } |
855 | |
2f75bae1 |
856 | /* |
857 | * The function which tries to send on a socket once it's deemed |
858 | * writable. |
859 | */ |
32874aea |
860 | void try_send(Actual_Socket s) |
861 | { |
5471d09a |
862 | while (s->sending_oob || bufchain_size(&s->output_data) > 0) { |
2f75bae1 |
863 | int nsent; |
864 | DWORD err; |
5471d09a |
865 | void *data; |
32874aea |
866 | int len, urgentflag; |
867 | |
868 | if (s->sending_oob) { |
869 | urgentflag = MSG_OOB; |
870 | len = s->sending_oob; |
5471d09a |
871 | data = &s->oobdata; |
32874aea |
872 | } else { |
873 | urgentflag = 0; |
5471d09a |
874 | bufchain_prefix(&s->output_data, &data, &len); |
32874aea |
875 | } |
5471d09a |
876 | nsent = send(s->s, data, len, urgentflag); |
32874aea |
877 | noise_ultralight(nsent); |
2f75bae1 |
878 | if (nsent <= 0) { |
879 | err = (nsent < 0 ? WSAGetLastError() : 0); |
e5eb3a1c |
880 | if ((err < WSABASEERR && nsent < 0) || err == WSAEWOULDBLOCK) { |
d40a94b9 |
881 | /* |
882 | * Perfectly normal: we've sent all we can for the moment. |
883 | * |
e5eb3a1c |
884 | * (Some WinSock send() implementations can return |
885 | * <0 but leave no sensible error indication - |
886 | * WSAGetLastError() is called but returns zero or |
887 | * a small number - so we check that case and treat |
888 | * it just like WSAEWOULDBLOCK.) |
d40a94b9 |
889 | */ |
2f75bae1 |
890 | s->writable = FALSE; |
32874aea |
891 | return; |
2f75bae1 |
892 | } else if (nsent == 0 || |
32874aea |
893 | err == WSAECONNABORTED || err == WSAECONNRESET) { |
894 | /* |
7732d38a |
895 | * If send() returns CONNABORTED or CONNRESET, we |
896 | * unfortunately can't just call plug_closing(), |
897 | * because it's quite likely that we're currently |
898 | * _in_ a call from the code we'd be calling back |
899 | * to, so we'd have to make half the SSH code |
900 | * reentrant. Instead we flag a pending error on |
901 | * the socket, to be dealt with (by calling |
902 | * plug_closing()) at some suitable future moment. |
32874aea |
903 | */ |
7732d38a |
904 | s->pending_error = err; |
905 | return; |
2f75bae1 |
906 | } else { |
a8327734 |
907 | /* We're inside the Windows frontend here, so we know |
908 | * that the frontend handle is unnecessary. */ |
909 | logevent(NULL, winsock_error_string(err)); |
247308b5 |
910 | fatalbox("%s", winsock_error_string(err)); |
2f75bae1 |
911 | } |
912 | } else { |
5471d09a |
913 | if (s->sending_oob) { |
914 | if (nsent < len) { |
915 | memmove(s->oobdata, s->oobdata+nsent, len-nsent); |
916 | s->sending_oob = len - nsent; |
917 | } else { |
918 | s->sending_oob = 0; |
919 | } |
920 | } else { |
921 | bufchain_consume(&s->output_data, nsent); |
2f75bae1 |
922 | } |
923 | } |
924 | } |
925 | } |
926 | |
e0e7dff8 |
927 | static int sk_tcp_write(Socket sock, const char *buf, int len) |
32874aea |
928 | { |
7e78000d |
929 | Actual_Socket s = (Actual_Socket) sock; |
930 | |
2f75bae1 |
931 | /* |
932 | * Add the data to the buffer list on the socket. |
933 | */ |
5471d09a |
934 | bufchain_add(&s->output_data, buf, len); |
2f75bae1 |
935 | |
936 | /* |
937 | * Now try sending from the start of the buffer list. |
938 | */ |
939 | if (s->writable) |
940 | try_send(s); |
5471d09a |
941 | |
942 | return bufchain_size(&s->output_data); |
2f75bae1 |
943 | } |
944 | |
e0e7dff8 |
945 | static int sk_tcp_write_oob(Socket sock, const char *buf, int len) |
32874aea |
946 | { |
7e78000d |
947 | Actual_Socket s = (Actual_Socket) sock; |
948 | |
2f75bae1 |
949 | /* |
950 | * Replace the buffer list on the socket with the data. |
951 | */ |
5471d09a |
952 | bufchain_clear(&s->output_data); |
953 | assert(len <= sizeof(s->oobdata)); |
954 | memcpy(s->oobdata, buf, len); |
2f75bae1 |
955 | s->sending_oob = len; |
956 | |
957 | /* |
958 | * Now try sending from the start of the buffer list. |
959 | */ |
960 | if (s->writable) |
961 | try_send(s); |
5471d09a |
962 | |
963 | return s->sending_oob; |
2f75bae1 |
964 | } |
965 | |
32874aea |
966 | int select_result(WPARAM wParam, LPARAM lParam) |
967 | { |
f9d3f227 |
968 | int ret, open; |
2f75bae1 |
969 | DWORD err; |
b675c612 |
970 | char buf[20480]; /* nice big buffer for plenty of speed */ |
7e78000d |
971 | Actual_Socket s; |
49bad831 |
972 | u_long atmark; |
2f75bae1 |
973 | |
974 | /* wParam is the socket itself */ |
cc8b0ee9 |
975 | |
ce6fcfa5 |
976 | if (wParam == 0) |
977 | return 1; /* boggle */ |
cc8b0ee9 |
978 | |
32874aea |
979 | s = find234(sktree, (void *) wParam, cmpforsearch); |
2f75bae1 |
980 | if (!s) |
981 | return 1; /* boggle */ |
982 | |
983 | if ((err = WSAGETSELECTERROR(lParam)) != 0) { |
32874aea |
984 | /* |
985 | * An error has occurred on this socket. Pass it to the |
986 | * plug. |
987 | */ |
988 | return plug_closing(s->plug, winsock_error_string(err), err, 0); |
2f75bae1 |
989 | } |
990 | |
7d6ee6ff |
991 | noise_ultralight(lParam); |
992 | |
2f75bae1 |
993 | switch (WSAGETSELECTEVENT(lParam)) { |
3ad9d396 |
994 | case FD_CONNECT: |
995 | s->connected = s->writable = 1; |
996 | break; |
2f75bae1 |
997 | case FD_READ: |
d74d141c |
998 | /* In the case the socket is still frozen, we don't even bother */ |
5471d09a |
999 | if (s->frozen) { |
1000 | s->frozen_readable = 1; |
d74d141c |
1001 | break; |
5471d09a |
1002 | } |
d74d141c |
1003 | |
32874aea |
1004 | /* |
1005 | * We have received data on the socket. For an oobinline |
1006 | * socket, this might be data _before_ an urgent pointer, |
1007 | * in which case we send it to the back end with type==1 |
1008 | * (data prior to urgent). |
1009 | */ |
1010 | if (s->oobinline) { |
1011 | atmark = 1; |
1012 | ioctlsocket(s->s, SIOCATMARK, &atmark); |
1013 | /* |
1014 | * Avoid checking the return value from ioctlsocket(), |
1015 | * on the grounds that some WinSock wrappers don't |
1016 | * support it. If it does nothing, we get atmark==1, |
1017 | * which is equivalent to `no OOB pending', so the |
1018 | * effect will be to non-OOB-ify any OOB data. |
1019 | */ |
1020 | } else |
1021 | atmark = 1; |
4b1e8acc |
1022 | |
2f75bae1 |
1023 | ret = recv(s->s, buf, sizeof(buf), 0); |
32874aea |
1024 | noise_ultralight(ret); |
2f75bae1 |
1025 | if (ret < 0) { |
1026 | err = WSAGetLastError(); |
1027 | if (err == WSAEWOULDBLOCK) { |
1028 | break; |
1029 | } |
1030 | } |
1031 | if (ret < 0) { |
32874aea |
1032 | return plug_closing(s->plug, winsock_error_string(err), err, |
1033 | 0); |
7e78000d |
1034 | } else if (0 == ret) { |
32874aea |
1035 | return plug_closing(s->plug, NULL, 0, 0); |
2f75bae1 |
1036 | } else { |
32874aea |
1037 | return plug_receive(s->plug, atmark ? 0 : 1, buf, ret); |
2f75bae1 |
1038 | } |
1039 | break; |
1040 | case FD_OOB: |
32874aea |
1041 | /* |
1042 | * This will only happen on a non-oobinline socket. It |
1043 | * indicates that we can immediately perform an OOB read |
1044 | * and get back OOB data, which we will send to the back |
1045 | * end with type==2 (urgent data). |
1046 | */ |
1047 | ret = recv(s->s, buf, sizeof(buf), MSG_OOB); |
1048 | noise_ultralight(ret); |
1049 | if (ret <= 0) { |
247308b5 |
1050 | char *str = (ret == 0 ? "Internal networking trouble" : |
1051 | winsock_error_string(WSAGetLastError())); |
a8327734 |
1052 | /* We're inside the Windows frontend here, so we know |
1053 | * that the frontend handle is unnecessary. */ |
1054 | logevent(NULL, str); |
247308b5 |
1055 | fatalbox("%s", str); |
32874aea |
1056 | } else { |
1057 | return plug_receive(s->plug, 2, buf, ret); |
1058 | } |
1059 | break; |
2f75bae1 |
1060 | case FD_WRITE: |
5471d09a |
1061 | { |
1062 | int bufsize_before, bufsize_after; |
1063 | s->writable = 1; |
1064 | bufsize_before = s->sending_oob + bufchain_size(&s->output_data); |
1065 | try_send(s); |
1066 | bufsize_after = s->sending_oob + bufchain_size(&s->output_data); |
1067 | if (bufsize_after < bufsize_before) |
1068 | plug_sent(s->plug, bufsize_after); |
1069 | } |
2f75bae1 |
1070 | break; |
1071 | case FD_CLOSE: |
f9d3f227 |
1072 | /* Signal a close on the socket. First read any outstanding data. */ |
32874aea |
1073 | open = 1; |
1074 | do { |
1075 | ret = recv(s->s, buf, sizeof(buf), 0); |
1076 | if (ret < 0) { |
1077 | err = WSAGetLastError(); |
1078 | if (err == WSAEWOULDBLOCK) |
1079 | break; |
1080 | return plug_closing(s->plug, winsock_error_string(err), |
1081 | err, 0); |
1082 | } else { |
1083 | if (ret) |
1084 | open &= plug_receive(s->plug, 0, buf, ret); |
1085 | else |
1086 | open &= plug_closing(s->plug, NULL, 0, 0); |
7e78000d |
1087 | } |
f9d3f227 |
1088 | } while (ret > 0); |
32874aea |
1089 | return open; |
d74d141c |
1090 | case FD_ACCEPT: |
1091 | { |
bc4802a1 |
1092 | struct sockaddr_in isa; |
1093 | int addrlen = sizeof(struct sockaddr_in); |
bcce45ed |
1094 | SOCKET t; /* socket of connection */ |
1095 | |
bc4802a1 |
1096 | memset(&isa, 0, sizeof(struct sockaddr_in)); |
bcce45ed |
1097 | err = 0; |
0e5e7f46 |
1098 | t = accept(s->s,(struct sockaddr *)&isa,&addrlen); |
bcce45ed |
1099 | if (t == INVALID_SOCKET) |
1100 | { |
1101 | err = WSAGetLastError(); |
1102 | if (err == WSATRY_AGAIN) |
1103 | break; |
1104 | } |
1105 | |
6ee9b735 |
1106 | if (s->localhost_only && !ipv4_is_loopback(isa.sin_addr)) { |
bc4802a1 |
1107 | closesocket(t); /* dodgy WinSock let nonlocal through */ |
1108 | } else if (plug_accepting(s->plug, (void*)t)) { |
bcce45ed |
1109 | closesocket(t); /* denied or error */ |
1110 | } |
d74d141c |
1111 | } |
2f75bae1 |
1112 | } |
1113 | |
1114 | return 1; |
1115 | } |
1116 | |
1117 | /* |
7732d38a |
1118 | * Deal with socket errors detected in try_send(). |
1119 | */ |
1120 | void net_pending_errors(void) |
1121 | { |
1122 | int i; |
1123 | Actual_Socket s; |
1124 | |
1125 | /* |
1126 | * This might be a fiddly business, because it's just possible |
1127 | * that handling a pending error on one socket might cause |
1128 | * others to be closed. (I can't think of any reason this might |
1129 | * happen in current SSH implementation, but to maintain |
1130 | * generality of this network layer I'll assume the worst.) |
1131 | * |
1132 | * So what we'll do is search the socket list for _one_ socket |
1133 | * with a pending error, and then handle it, and then search |
1134 | * the list again _from the beginning_. Repeat until we make a |
1135 | * pass with no socket errors present. That way we are |
1136 | * protected against the socket list changing under our feet. |
1137 | */ |
1138 | |
1139 | do { |
1140 | for (i = 0; (s = index234(sktree, i)) != NULL; i++) { |
1141 | if (s->pending_error) { |
1142 | /* |
1143 | * An error has occurred on this socket. Pass it to the |
1144 | * plug. |
1145 | */ |
1146 | plug_closing(s->plug, |
1147 | winsock_error_string(s->pending_error), |
1148 | s->pending_error, 0); |
1149 | break; |
1150 | } |
1151 | } |
1152 | } while (s); |
1153 | } |
1154 | |
1155 | /* |
2f75bae1 |
1156 | * Each socket abstraction contains a `void *' private field in |
1157 | * which the client can keep state. |
1158 | */ |
8eebd221 |
1159 | static void sk_tcp_set_private_ptr(Socket sock, void *ptr) |
32874aea |
1160 | { |
7e78000d |
1161 | Actual_Socket s = (Actual_Socket) sock; |
2f75bae1 |
1162 | s->private_ptr = ptr; |
1163 | } |
32874aea |
1164 | |
8eebd221 |
1165 | static void *sk_tcp_get_private_ptr(Socket sock) |
32874aea |
1166 | { |
7e78000d |
1167 | Actual_Socket s = (Actual_Socket) sock; |
2f75bae1 |
1168 | return s->private_ptr; |
1169 | } |
1170 | |
1171 | /* |
1172 | * Special error values are returned from sk_namelookup and sk_new |
1173 | * if there's a problem. These functions extract an error message, |
1174 | * or return NULL if there's no problem. |
1175 | */ |
32874aea |
1176 | char *sk_addr_error(SockAddr addr) |
1177 | { |
2f75bae1 |
1178 | return addr->error; |
1179 | } |
32874aea |
1180 | static char *sk_tcp_socket_error(Socket sock) |
1181 | { |
7e78000d |
1182 | Actual_Socket s = (Actual_Socket) sock; |
2f75bae1 |
1183 | return s->error; |
1184 | } |
1185 | |
8eebd221 |
1186 | static void sk_tcp_set_frozen(Socket sock, int is_frozen) |
d74d141c |
1187 | { |
1188 | Actual_Socket s = (Actual_Socket) sock; |
5471d09a |
1189 | if (s->frozen == is_frozen) |
1190 | return; |
d74d141c |
1191 | s->frozen = is_frozen; |
5471d09a |
1192 | if (!is_frozen && s->frozen_readable) { |
d74d141c |
1193 | char c; |
1194 | recv(s->s, &c, 1, MSG_PEEK); |
1195 | } |
5471d09a |
1196 | s->frozen_readable = 0; |
d74d141c |
1197 | } |
1198 | |
2f75bae1 |
1199 | /* |
1200 | * For Plink: enumerate all sockets currently active. |
1201 | */ |
32874aea |
1202 | SOCKET first_socket(int *state) |
1203 | { |
d2371c81 |
1204 | Actual_Socket s; |
1205 | *state = 0; |
1206 | s = index234(sktree, (*state)++); |
2f75bae1 |
1207 | return s ? s->s : INVALID_SOCKET; |
1208 | } |
32874aea |
1209 | |
1210 | SOCKET next_socket(int *state) |
1211 | { |
d2371c81 |
1212 | Actual_Socket s = index234(sktree, (*state)++); |
2f75bae1 |
1213 | return s ? s->s : INVALID_SOCKET; |
1214 | } |
68a49acb |
1215 | |
1216 | int net_service_lookup(char *service) |
1217 | { |
1218 | struct servent *se; |
1219 | se = getservbyname(service, NULL); |
1220 | if (se != NULL) |
1221 | return ntohs(se->s_port); |
1222 | else |
1223 | return 0; |
1224 | } |