c5e438ec |
1 | /* |
2 | * Unix networking abstraction. |
3 | */ |
4 | |
5 | #include <stdio.h> |
6 | #include <stdlib.h> |
7 | #include <assert.h> |
8 | #include <errno.h> |
9 | #include <fcntl.h> |
10 | #include <unistd.h> |
11 | #include <sys/types.h> |
12 | #include <sys/socket.h> |
13 | #include <sys/ioctl.h> |
14 | #include <arpa/inet.h> |
15 | #include <netinet/in.h> |
16 | #include <netinet/tcp.h> |
17 | #include <netdb.h> |
18 | |
19 | #define DEFINE_PLUG_METHOD_MACROS |
20 | #include "putty.h" |
21 | #include "network.h" |
22 | #include "tree234.h" |
23 | |
6ee9b735 |
24 | #define ipv4_is_loopback(addr) (inet_netof(addr) == IN_LOOPBACKNET) |
25 | |
c5e438ec |
26 | struct Socket_tag { |
27 | struct socket_function_table *fn; |
28 | /* the above variable absolutely *must* be the first in this structure */ |
29 | char *error; |
30 | int s; |
31 | Plug plug; |
32 | void *private_ptr; |
33 | bufchain output_data; |
34 | int connected; |
35 | int writable; |
36 | int frozen; /* this causes readability notifications to be ignored */ |
37 | int frozen_readable; /* this means we missed at least one readability |
38 | * notification while we were frozen */ |
39 | int localhost_only; /* for listening sockets */ |
40 | char oobdata[1]; |
41 | int sending_oob; |
42 | int oobpending; /* is there OOB data available to read? */ |
43 | int oobinline; |
44 | int pending_error; /* in case send() returns error */ |
45 | int listener; |
46 | }; |
47 | |
48 | /* |
49 | * We used to typedef struct Socket_tag *Socket. |
50 | * |
51 | * Since we have made the networking abstraction slightly more |
52 | * abstract, Socket no longer means a tcp socket (it could mean |
53 | * an ssl socket). So now we must use Actual_Socket when we know |
54 | * we are talking about a tcp socket. |
55 | */ |
56 | typedef struct Socket_tag *Actual_Socket; |
57 | |
58 | struct SockAddr_tag { |
59 | char *error; |
b7a189f3 |
60 | /* |
61 | * Which address family this address belongs to. AF_INET for |
62 | * IPv4; AF_INET6 for IPv6; AF_UNSPEC indicates that name |
63 | * resolution has not been done and a simple host name is held |
64 | * in this SockAddr structure. |
65 | */ |
c5e438ec |
66 | int family; |
67 | unsigned long address; /* Address IPv4 style. */ |
68 | #ifdef IPV6 |
69 | struct addrinfo *ai; /* Address IPv6 style. */ |
70 | #endif |
b7a189f3 |
71 | char hostname[512]; /* Store an unresolved host name. */ |
c5e438ec |
72 | }; |
73 | |
74 | static tree234 *sktree; |
75 | |
0ff9ea38 |
76 | static void uxsel_tell(Actual_Socket s); |
77 | |
c5e438ec |
78 | static int cmpfortree(void *av, void *bv) |
79 | { |
80 | Actual_Socket a = (Actual_Socket) av, b = (Actual_Socket) bv; |
81 | int as = a->s, bs = b->s; |
82 | if (as < bs) |
83 | return -1; |
84 | if (as > bs) |
85 | return +1; |
86 | return 0; |
87 | } |
88 | |
89 | static int cmpforsearch(void *av, void *bv) |
90 | { |
91 | Actual_Socket b = (Actual_Socket) bv; |
92 | int as = (int) av, bs = b->s; |
93 | if (as < bs) |
94 | return -1; |
95 | if (as > bs) |
96 | return +1; |
97 | return 0; |
98 | } |
99 | |
100 | void sk_init(void) |
101 | { |
102 | sktree = newtree234(cmpfortree); |
103 | } |
104 | |
105 | void sk_cleanup(void) |
106 | { |
107 | Actual_Socket s; |
108 | int i; |
109 | |
110 | if (sktree) { |
111 | for (i = 0; (s = index234(sktree, i)) != NULL; i++) { |
112 | close(s->s); |
113 | } |
114 | } |
115 | } |
116 | |
117 | char *error_string(int error) |
118 | { |
e266735f |
119 | return strerror(error); |
c5e438ec |
120 | } |
121 | |
e8fa8f62 |
122 | SockAddr sk_namelookup(const char *host, char **canonicalname) |
c5e438ec |
123 | { |
3d88e64d |
124 | SockAddr ret = snew(struct SockAddr_tag); |
c5e438ec |
125 | unsigned long a; |
126 | struct hostent *h = NULL; |
127 | char realhost[8192]; |
128 | |
129 | /* Clear the structure and default to IPv4. */ |
130 | memset(ret, 0, sizeof(struct SockAddr_tag)); |
131 | ret->family = 0; /* We set this one when we have resolved the host. */ |
132 | *realhost = '\0'; |
133 | ret->error = NULL; |
134 | |
135 | if ((a = inet_addr(host)) == (unsigned long) INADDR_NONE) { |
136 | #ifdef IPV6 |
137 | if (getaddrinfo(host, NULL, NULL, &ret->ai) == 0) { |
138 | ret->family = ret->ai->ai_family; |
139 | } else |
140 | #endif |
141 | { |
142 | /* |
143 | * Otherwise use the IPv4-only gethostbyname... (NOTE: |
144 | * we don't use gethostbyname as a fallback!) |
145 | */ |
146 | if (ret->family == 0) { |
147 | /*debug(("Resolving \"%s\" with gethostbyname() (IPv4 only)...\n", host)); */ |
148 | if ( (h = gethostbyname(host)) ) |
149 | ret->family = AF_INET; |
150 | } |
8c43874c |
151 | if (ret->family == 0) { |
c5e438ec |
152 | ret->error = (h_errno == HOST_NOT_FOUND || |
153 | h_errno == NO_DATA || |
154 | h_errno == NO_ADDRESS ? "Host does not exist" : |
155 | h_errno == TRY_AGAIN ? |
156 | "Temporary name service failure" : |
157 | "gethostbyname: unknown error"); |
8c43874c |
158 | return ret; |
159 | } |
c5e438ec |
160 | } |
161 | |
162 | #ifdef IPV6 |
163 | /* If we got an address info use that... */ |
164 | if (ret->ai) { |
165 | |
166 | /* Are we in IPv4 fallback mode? */ |
167 | /* We put the IPv4 address into the a variable so we can further-on use the IPv4 code... */ |
168 | if (ret->family == AF_INET) |
169 | memcpy(&a, |
170 | (char *) &((struct sockaddr_in *) ret->ai-> |
171 | ai_addr)->sin_addr, sizeof(a)); |
172 | |
173 | /* Now let's find that canonicalname... */ |
174 | if (getnameinfo((struct sockaddr *) ret->ai->ai_addr, |
175 | ret->family == |
176 | AF_INET ? sizeof(struct sockaddr_in) : |
177 | sizeof(struct sockaddr_in6), realhost, |
178 | sizeof(realhost), NULL, 0, 0) != 0) { |
179 | strncpy(realhost, host, sizeof(realhost)); |
180 | } |
181 | } |
182 | /* We used the IPv4-only gethostbyname()... */ |
183 | else |
184 | #endif |
185 | { |
186 | memcpy(&a, h->h_addr, sizeof(a)); |
187 | /* This way we are always sure the h->h_name is valid :) */ |
188 | strncpy(realhost, h->h_name, sizeof(realhost)); |
189 | } |
190 | } else { |
191 | /* |
192 | * This must be a numeric IPv4 address because it caused a |
193 | * success return from inet_addr. |
194 | */ |
195 | ret->family = AF_INET; |
196 | strncpy(realhost, host, sizeof(realhost)); |
197 | } |
198 | ret->address = ntohl(a); |
199 | realhost[lenof(realhost)-1] = '\0'; |
3d88e64d |
200 | *canonicalname = snewn(1+strlen(realhost), char); |
c5e438ec |
201 | strcpy(*canonicalname, realhost); |
202 | return ret; |
203 | } |
204 | |
e8fa8f62 |
205 | SockAddr sk_nonamelookup(const char *host) |
b7a189f3 |
206 | { |
3d88e64d |
207 | SockAddr ret = snew(struct SockAddr_tag); |
ab0873ab |
208 | ret->error = NULL; |
b7a189f3 |
209 | ret->family = AF_UNSPEC; |
210 | strncpy(ret->hostname, host, lenof(ret->hostname)); |
211 | ret->hostname[lenof(ret->hostname)-1] = '\0'; |
212 | return ret; |
213 | } |
214 | |
c5e438ec |
215 | void sk_getaddr(SockAddr addr, char *buf, int buflen) |
216 | { |
217 | #ifdef IPV6 |
b7a189f3 |
218 | if (addr->family == AF_INET6) { |
219 | FIXME; /* I don't know how to get a text form of an IPv6 address. */ |
220 | } else |
c5e438ec |
221 | #endif |
b7a189f3 |
222 | if (addr->family == AF_INET) { |
c5e438ec |
223 | struct in_addr a; |
224 | a.s_addr = htonl(addr->address); |
225 | strncpy(buf, inet_ntoa(a), buflen); |
b7a189f3 |
226 | buf[buflen-1] = '\0'; |
c5e438ec |
227 | } else { |
b7a189f3 |
228 | assert(addr->family == AF_UNSPEC); |
229 | strncpy(buf, addr->hostname, buflen); |
230 | buf[buflen-1] = '\0'; |
c5e438ec |
231 | } |
c5e438ec |
232 | } |
233 | |
b804e1e5 |
234 | int sk_hostname_is_local(char *name) |
235 | { |
236 | return !strcmp(name, "localhost"); |
237 | } |
238 | |
239 | int sk_address_is_local(SockAddr addr) |
240 | { |
241 | #ifdef IPV6 |
b7a189f3 |
242 | if (addr->family == AF_INET6) { |
243 | FIXME; /* someone who can compile for IPV6 had better do this bit */ |
244 | } else |
b804e1e5 |
245 | #endif |
b7a189f3 |
246 | if (addr->family == AF_INET) { |
b804e1e5 |
247 | struct in_addr a; |
248 | a.s_addr = htonl(addr->address); |
249 | return ipv4_is_loopback(a); |
b804e1e5 |
250 | } else { |
b7a189f3 |
251 | assert(addr->family == AF_UNSPEC); |
252 | return 0; /* we don't know; assume not */ |
b804e1e5 |
253 | } |
b804e1e5 |
254 | } |
255 | |
c5e438ec |
256 | int sk_addrtype(SockAddr addr) |
257 | { |
b7a189f3 |
258 | return (addr->family == AF_INET ? ADDRTYPE_IPV4 : |
259 | #ifdef IPV6 |
260 | addr->family == AF_INET6 ? ADDRTYPE_IPV6 : |
261 | #endif |
262 | ADDRTYPE_NAME); |
c5e438ec |
263 | } |
264 | |
265 | void sk_addrcopy(SockAddr addr, char *buf) |
266 | { |
b7a189f3 |
267 | assert(addr->family != AF_UNSPEC); |
c5e438ec |
268 | #ifdef IPV6 |
b7a189f3 |
269 | if (addr->family == AF_INET6) { |
270 | memcpy(buf, (char*) addr->ai, 16); |
271 | } else |
c5e438ec |
272 | #endif |
b7a189f3 |
273 | if (addr->family == AF_INET) { |
c5e438ec |
274 | struct in_addr a; |
275 | a.s_addr = htonl(addr->address); |
276 | memcpy(buf, (char*) &a.s_addr, 4); |
c5e438ec |
277 | } |
c5e438ec |
278 | } |
279 | |
280 | void sk_addr_free(SockAddr addr) |
281 | { |
282 | sfree(addr); |
283 | } |
284 | |
285 | static Plug sk_tcp_plug(Socket sock, Plug p) |
286 | { |
287 | Actual_Socket s = (Actual_Socket) sock; |
288 | Plug ret = s->plug; |
289 | if (p) |
290 | s->plug = p; |
291 | return ret; |
292 | } |
293 | |
294 | static void sk_tcp_flush(Socket s) |
295 | { |
296 | /* |
297 | * We send data to the socket as soon as we can anyway, |
298 | * so we don't need to do anything here. :-) |
299 | */ |
300 | } |
301 | |
302 | static void sk_tcp_close(Socket s); |
e0e7dff8 |
303 | static int sk_tcp_write(Socket s, const char *data, int len); |
304 | static int sk_tcp_write_oob(Socket s, const char *data, int len); |
c5e438ec |
305 | static void sk_tcp_set_private_ptr(Socket s, void *ptr); |
306 | static void *sk_tcp_get_private_ptr(Socket s); |
307 | static void sk_tcp_set_frozen(Socket s, int is_frozen); |
308 | static char *sk_tcp_socket_error(Socket s); |
309 | |
2f92b717 |
310 | static struct socket_function_table tcp_fn_table = { |
311 | sk_tcp_plug, |
312 | sk_tcp_close, |
313 | sk_tcp_write, |
314 | sk_tcp_write_oob, |
315 | sk_tcp_flush, |
316 | sk_tcp_set_private_ptr, |
317 | sk_tcp_get_private_ptr, |
318 | sk_tcp_set_frozen, |
319 | sk_tcp_socket_error |
320 | }; |
321 | |
c5e438ec |
322 | Socket sk_register(void *sock, Plug plug) |
323 | { |
c5e438ec |
324 | Actual_Socket ret; |
325 | |
326 | /* |
327 | * Create Socket structure. |
328 | */ |
3d88e64d |
329 | ret = snew(struct Socket_tag); |
2f92b717 |
330 | ret->fn = &tcp_fn_table; |
c5e438ec |
331 | ret->error = NULL; |
332 | ret->plug = plug; |
333 | bufchain_init(&ret->output_data); |
334 | ret->writable = 1; /* to start with */ |
335 | ret->sending_oob = 0; |
336 | ret->frozen = 1; |
337 | ret->frozen_readable = 0; |
338 | ret->localhost_only = 0; /* unused, but best init anyway */ |
339 | ret->pending_error = 0; |
340 | ret->oobpending = FALSE; |
341 | ret->listener = 0; |
342 | |
343 | ret->s = (int)sock; |
344 | |
345 | if (ret->s < 0) { |
346 | ret->error = error_string(errno); |
347 | return (Socket) ret; |
348 | } |
349 | |
350 | ret->oobinline = 0; |
351 | |
0ff9ea38 |
352 | uxsel_tell(ret); |
c5e438ec |
353 | add234(sktree, ret); |
354 | |
355 | return (Socket) ret; |
356 | } |
357 | |
358 | Socket sk_new(SockAddr addr, int port, int privport, int oobinline, |
359 | int nodelay, Plug plug) |
360 | { |
c5e438ec |
361 | int s; |
362 | #ifdef IPV6 |
363 | struct sockaddr_in6 a6; |
364 | #endif |
365 | struct sockaddr_in a; |
366 | int err; |
367 | Actual_Socket ret; |
368 | short localport; |
369 | |
370 | /* |
371 | * Create Socket structure. |
372 | */ |
3d88e64d |
373 | ret = snew(struct Socket_tag); |
2f92b717 |
374 | ret->fn = &tcp_fn_table; |
c5e438ec |
375 | ret->error = NULL; |
376 | ret->plug = plug; |
377 | bufchain_init(&ret->output_data); |
378 | ret->connected = 0; /* to start with */ |
379 | ret->writable = 0; /* to start with */ |
380 | ret->sending_oob = 0; |
381 | ret->frozen = 0; |
382 | ret->frozen_readable = 0; |
383 | ret->localhost_only = 0; /* unused, but best init anyway */ |
384 | ret->pending_error = 0; |
385 | ret->oobpending = FALSE; |
386 | ret->listener = 0; |
387 | |
388 | /* |
389 | * Open socket. |
390 | */ |
b7a189f3 |
391 | assert(addr->family != AF_UNSPEC); |
c5e438ec |
392 | s = socket(addr->family, SOCK_STREAM, 0); |
393 | ret->s = s; |
394 | |
395 | if (s < 0) { |
396 | ret->error = error_string(errno); |
397 | return (Socket) ret; |
398 | } |
399 | |
400 | ret->oobinline = oobinline; |
401 | if (oobinline) { |
402 | int b = TRUE; |
403 | setsockopt(s, SOL_SOCKET, SO_OOBINLINE, (void *) &b, sizeof(b)); |
404 | } |
405 | |
406 | if (nodelay) { |
407 | int b = TRUE; |
408 | setsockopt(s, IPPROTO_TCP, TCP_NODELAY, (void *) &b, sizeof(b)); |
409 | } |
410 | |
411 | /* |
412 | * Bind to local address. |
413 | */ |
414 | if (privport) |
415 | localport = 1023; /* count from 1023 downwards */ |
416 | else |
417 | localport = 0; /* just use port 0 (ie kernel picks) */ |
418 | |
419 | /* Loop round trying to bind */ |
420 | while (1) { |
421 | int retcode; |
422 | |
423 | #ifdef IPV6 |
424 | if (addr->family == AF_INET6) { |
425 | memset(&a6, 0, sizeof(a6)); |
426 | a6.sin6_family = AF_INET6; |
427 | /*a6.sin6_addr = in6addr_any; *//* == 0 */ |
428 | a6.sin6_port = htons(localport); |
429 | } else |
430 | #endif |
431 | { |
432 | a.sin_family = AF_INET; |
433 | a.sin_addr.s_addr = htonl(INADDR_ANY); |
434 | a.sin_port = htons(localport); |
435 | } |
436 | #ifdef IPV6 |
437 | retcode = bind(s, (addr->family == AF_INET6 ? |
438 | (struct sockaddr *) &a6 : |
439 | (struct sockaddr *) &a), |
440 | (addr->family == |
441 | AF_INET6 ? sizeof(a6) : sizeof(a))); |
442 | #else |
443 | retcode = bind(s, (struct sockaddr *) &a, sizeof(a)); |
444 | #endif |
445 | if (retcode >= 0) { |
446 | err = 0; |
447 | break; /* done */ |
448 | } else { |
449 | err = errno; |
450 | if (err != EADDRINUSE) /* failed, for a bad reason */ |
451 | break; |
452 | } |
453 | |
454 | if (localport == 0) |
455 | break; /* we're only looping once */ |
456 | localport--; |
457 | if (localport == 0) |
458 | break; /* we might have got to the end */ |
459 | } |
460 | |
461 | if (err) { |
462 | ret->error = error_string(err); |
463 | return (Socket) ret; |
464 | } |
465 | |
466 | /* |
467 | * Connect to remote address. |
468 | */ |
469 | #ifdef IPV6 |
470 | if (addr->family == AF_INET6) { |
471 | memset(&a, 0, sizeof(a)); |
472 | a6.sin6_family = AF_INET6; |
473 | a6.sin6_port = htons((short) port); |
474 | a6.sin6_addr = |
475 | ((struct sockaddr_in6 *) addr->ai->ai_addr)->sin6_addr; |
476 | } else |
477 | #endif |
478 | { |
479 | a.sin_family = AF_INET; |
480 | a.sin_addr.s_addr = htonl(addr->address); |
481 | a.sin_port = htons((short) port); |
482 | } |
483 | |
051dd789 |
484 | { |
485 | int i = 1; |
486 | ioctl(s, FIONBIO, &i); |
487 | } |
488 | |
c5e438ec |
489 | if (( |
490 | #ifdef IPV6 |
491 | connect(s, ((addr->family == AF_INET6) ? |
492 | (struct sockaddr *) &a6 : (struct sockaddr *) &a), |
493 | (addr->family == AF_INET6) ? sizeof(a6) : sizeof(a)) |
494 | #else |
495 | connect(s, (struct sockaddr *) &a, sizeof(a)) |
496 | #endif |
497 | ) < 0) { |
051dd789 |
498 | if ( errno != EINPROGRESS ) { |
c5e438ec |
499 | ret->error = error_string(errno); |
500 | return (Socket) ret; |
501 | } |
502 | } else { |
503 | /* |
504 | * If we _don't_ get EWOULDBLOCK, the connect has completed |
505 | * and we should set the socket as connected and writable. |
506 | */ |
507 | ret->connected = 1; |
508 | ret->writable = 1; |
509 | } |
510 | |
0ff9ea38 |
511 | uxsel_tell(ret); |
c5e438ec |
512 | add234(sktree, ret); |
513 | |
514 | return (Socket) ret; |
515 | } |
516 | |
6ee9b735 |
517 | Socket sk_newlistener(char *srcaddr, int port, Plug plug, int local_host_only) |
c5e438ec |
518 | { |
c5e438ec |
519 | int s; |
520 | #ifdef IPV6 |
521 | struct sockaddr_in6 a6; |
522 | #endif |
523 | struct sockaddr_in a; |
524 | int err; |
525 | Actual_Socket ret; |
526 | int retcode; |
527 | int on = 1; |
528 | |
529 | /* |
530 | * Create Socket structure. |
531 | */ |
3d88e64d |
532 | ret = snew(struct Socket_tag); |
2f92b717 |
533 | ret->fn = &tcp_fn_table; |
c5e438ec |
534 | ret->error = NULL; |
535 | ret->plug = plug; |
536 | bufchain_init(&ret->output_data); |
537 | ret->writable = 0; /* to start with */ |
538 | ret->sending_oob = 0; |
539 | ret->frozen = 0; |
540 | ret->frozen_readable = 0; |
541 | ret->localhost_only = local_host_only; |
542 | ret->pending_error = 0; |
543 | ret->oobpending = FALSE; |
544 | ret->listener = 1; |
545 | |
546 | /* |
547 | * Open socket. |
548 | */ |
549 | s = socket(AF_INET, SOCK_STREAM, 0); |
550 | ret->s = s; |
551 | |
552 | if (s < 0) { |
553 | ret->error = error_string(errno); |
554 | return (Socket) ret; |
555 | } |
556 | |
557 | ret->oobinline = 0; |
558 | |
559 | setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (const char *)&on, sizeof(on)); |
560 | |
561 | #ifdef IPV6 |
562 | if (addr->family == AF_INET6) { |
563 | memset(&a6, 0, sizeof(a6)); |
564 | a6.sin6_family = AF_INET6; |
6ee9b735 |
565 | /* FIXME: srcaddr is ignored for IPv6, because I (SGT) don't |
566 | * know how to do it. :-) */ |
c5e438ec |
567 | if (local_host_only) |
568 | a6.sin6_addr = in6addr_loopback; |
569 | else |
570 | a6.sin6_addr = in6addr_any; |
571 | a6.sin6_port = htons(port); |
572 | } else |
573 | #endif |
574 | { |
6ee9b735 |
575 | int got_addr = 0; |
c5e438ec |
576 | a.sin_family = AF_INET; |
6ee9b735 |
577 | |
578 | /* |
579 | * Bind to source address. First try an explicitly |
580 | * specified one... |
581 | */ |
582 | if (srcaddr) { |
583 | a.sin_addr.s_addr = inet_addr(srcaddr); |
584 | if (a.sin_addr.s_addr != INADDR_NONE) { |
585 | /* Override localhost_only with specified listen addr. */ |
586 | ret->localhost_only = ipv4_is_loopback(a.sin_addr); |
587 | got_addr = 1; |
588 | } |
589 | } |
590 | |
591 | /* |
592 | * ... and failing that, go with one of the standard ones. |
593 | */ |
594 | if (!got_addr) { |
595 | if (local_host_only) |
596 | a.sin_addr.s_addr = htonl(INADDR_LOOPBACK); |
597 | else |
598 | a.sin_addr.s_addr = htonl(INADDR_ANY); |
599 | } |
600 | |
c5e438ec |
601 | a.sin_port = htons((short)port); |
602 | } |
603 | #ifdef IPV6 |
604 | retcode = bind(s, (addr->family == AF_INET6 ? |
605 | (struct sockaddr *) &a6 : |
606 | (struct sockaddr *) &a), |
607 | (addr->family == |
608 | AF_INET6 ? sizeof(a6) : sizeof(a))); |
609 | #else |
610 | retcode = bind(s, (struct sockaddr *) &a, sizeof(a)); |
611 | #endif |
612 | if (retcode >= 0) { |
613 | err = 0; |
614 | } else { |
615 | err = errno; |
616 | } |
617 | |
618 | if (err) { |
619 | ret->error = error_string(err); |
620 | return (Socket) ret; |
621 | } |
622 | |
623 | |
624 | if (listen(s, SOMAXCONN) < 0) { |
625 | close(s); |
626 | ret->error = error_string(errno); |
627 | return (Socket) ret; |
628 | } |
629 | |
0ff9ea38 |
630 | uxsel_tell(ret); |
c5e438ec |
631 | add234(sktree, ret); |
632 | |
633 | return (Socket) ret; |
634 | } |
635 | |
636 | static void sk_tcp_close(Socket sock) |
637 | { |
638 | Actual_Socket s = (Actual_Socket) sock; |
639 | |
0ff9ea38 |
640 | uxsel_del(s->s); |
c5e438ec |
641 | del234(sktree, s); |
642 | close(s->s); |
643 | sfree(s); |
644 | } |
645 | |
2f92b717 |
646 | int sk_getxdmdata(void *sock, unsigned long *ip, int *port) |
647 | { |
648 | Actual_Socket s = (Actual_Socket) sock; |
649 | struct sockaddr_in addr; |
650 | socklen_t addrlen; |
651 | |
652 | /* |
653 | * We must check that this socket really _is_ an Actual_Socket. |
654 | */ |
655 | if (s->fn != &tcp_fn_table) |
656 | return 0; /* failure */ |
657 | |
658 | /* |
659 | * If we ever implement connecting to a local X server through |
660 | * a Unix socket, we return 0xFFFFFFFF for the IP address and |
661 | * our current pid for the port. Bizarre, but such is life. |
662 | */ |
663 | |
664 | addrlen = sizeof(addr); |
665 | if (getsockname(s->s, (struct sockaddr *)&addr, &addrlen) < 0 || |
666 | addr.sin_family != AF_INET) |
667 | return 0; |
668 | |
669 | *ip = ntohl(addr.sin_addr.s_addr); |
670 | *port = ntohs(addr.sin_port); |
671 | |
672 | return 1; |
673 | } |
674 | |
c5e438ec |
675 | /* |
676 | * The function which tries to send on a socket once it's deemed |
677 | * writable. |
678 | */ |
679 | void try_send(Actual_Socket s) |
680 | { |
681 | while (s->sending_oob || bufchain_size(&s->output_data) > 0) { |
682 | int nsent; |
683 | int err; |
684 | void *data; |
685 | int len, urgentflag; |
686 | |
687 | if (s->sending_oob) { |
688 | urgentflag = MSG_OOB; |
689 | len = s->sending_oob; |
690 | data = &s->oobdata; |
691 | } else { |
692 | urgentflag = 0; |
693 | bufchain_prefix(&s->output_data, &data, &len); |
694 | } |
695 | nsent = send(s->s, data, len, urgentflag); |
696 | noise_ultralight(nsent); |
697 | if (nsent <= 0) { |
698 | err = (nsent < 0 ? errno : 0); |
699 | if (err == EWOULDBLOCK) { |
700 | /* |
701 | * Perfectly normal: we've sent all we can for the moment. |
702 | */ |
703 | s->writable = FALSE; |
704 | return; |
705 | } else if (nsent == 0 || |
706 | err == ECONNABORTED || err == ECONNRESET) { |
707 | /* |
708 | * If send() returns CONNABORTED or CONNRESET, we |
709 | * unfortunately can't just call plug_closing(), |
710 | * because it's quite likely that we're currently |
711 | * _in_ a call from the code we'd be calling back |
712 | * to, so we'd have to make half the SSH code |
713 | * reentrant. Instead we flag a pending error on |
714 | * the socket, to be dealt with (by calling |
715 | * plug_closing()) at some suitable future moment. |
716 | */ |
717 | s->pending_error = err; |
718 | return; |
719 | } else { |
720 | /* We're inside the Unix frontend here, so we know |
721 | * that the frontend handle is unnecessary. */ |
722 | logevent(NULL, error_string(err)); |
723 | fatalbox("%s", error_string(err)); |
724 | } |
725 | } else { |
726 | if (s->sending_oob) { |
727 | if (nsent < len) { |
728 | memmove(s->oobdata, s->oobdata+nsent, len-nsent); |
729 | s->sending_oob = len - nsent; |
730 | } else { |
731 | s->sending_oob = 0; |
732 | } |
733 | } else { |
734 | bufchain_consume(&s->output_data, nsent); |
735 | } |
736 | } |
737 | } |
0ff9ea38 |
738 | uxsel_tell(s); |
c5e438ec |
739 | } |
740 | |
e0e7dff8 |
741 | static int sk_tcp_write(Socket sock, const char *buf, int len) |
c5e438ec |
742 | { |
743 | Actual_Socket s = (Actual_Socket) sock; |
744 | |
745 | /* |
746 | * Add the data to the buffer list on the socket. |
747 | */ |
748 | bufchain_add(&s->output_data, buf, len); |
749 | |
750 | /* |
751 | * Now try sending from the start of the buffer list. |
752 | */ |
753 | if (s->writable) |
754 | try_send(s); |
755 | |
756 | return bufchain_size(&s->output_data); |
757 | } |
758 | |
e0e7dff8 |
759 | static int sk_tcp_write_oob(Socket sock, const char *buf, int len) |
c5e438ec |
760 | { |
761 | Actual_Socket s = (Actual_Socket) sock; |
762 | |
763 | /* |
764 | * Replace the buffer list on the socket with the data. |
765 | */ |
766 | bufchain_clear(&s->output_data); |
767 | assert(len <= sizeof(s->oobdata)); |
768 | memcpy(s->oobdata, buf, len); |
769 | s->sending_oob = len; |
770 | |
771 | /* |
772 | * Now try sending from the start of the buffer list. |
773 | */ |
774 | if (s->writable) |
775 | try_send(s); |
776 | |
777 | return s->sending_oob; |
778 | } |
779 | |
0ff9ea38 |
780 | static int net_select_result(int fd, int event) |
c5e438ec |
781 | { |
782 | int ret; |
783 | int err; |
784 | char buf[20480]; /* nice big buffer for plenty of speed */ |
785 | Actual_Socket s; |
786 | u_long atmark; |
787 | |
788 | /* Find the Socket structure */ |
789 | s = find234(sktree, (void *) fd, cmpforsearch); |
790 | if (!s) |
791 | return 1; /* boggle */ |
792 | |
793 | noise_ultralight(event); |
794 | |
795 | switch (event) { |
c5e438ec |
796 | case 4: /* exceptional */ |
797 | if (!s->oobinline) { |
798 | /* |
799 | * On a non-oobinline socket, this indicates that we |
800 | * can immediately perform an OOB read and get back OOB |
801 | * data, which we will send to the back end with |
802 | * type==2 (urgent data). |
803 | */ |
804 | ret = recv(s->s, buf, sizeof(buf), MSG_OOB); |
805 | noise_ultralight(ret); |
806 | if (ret <= 0) { |
807 | char *str = (ret == 0 ? "Internal networking trouble" : |
808 | error_string(errno)); |
809 | /* We're inside the Unix frontend here, so we know |
810 | * that the frontend handle is unnecessary. */ |
811 | logevent(NULL, str); |
812 | fatalbox("%s", str); |
813 | } else { |
814 | return plug_receive(s->plug, 2, buf, ret); |
815 | } |
816 | break; |
817 | } |
818 | |
819 | /* |
820 | * If we reach here, this is an oobinline socket, which |
56e5b2db |
821 | * means we should set s->oobpending and then deal with it |
822 | * when we get called for the readability event (which |
823 | * should also occur). |
c5e438ec |
824 | */ |
825 | s->oobpending = TRUE; |
56e5b2db |
826 | break; |
c5e438ec |
827 | case 1: /* readable; also acceptance */ |
828 | if (s->listener) { |
829 | /* |
830 | * On a listening socket, the readability event means a |
831 | * connection is ready to be accepted. |
832 | */ |
833 | struct sockaddr_in isa; |
834 | int addrlen = sizeof(struct sockaddr_in); |
835 | int t; /* socket of connection */ |
836 | |
837 | memset(&isa, 0, sizeof(struct sockaddr_in)); |
838 | err = 0; |
839 | t = accept(s->s,(struct sockaddr *)&isa,&addrlen); |
840 | if (t < 0) { |
841 | break; |
842 | } |
843 | |
6ee9b735 |
844 | if (s->localhost_only && !ipv4_is_loopback(isa.sin_addr)) { |
c5e438ec |
845 | close(t); /* someone let nonlocal through?! */ |
846 | } else if (plug_accepting(s->plug, (void*)t)) { |
847 | close(t); /* denied or error */ |
848 | } |
849 | break; |
850 | } |
851 | |
852 | /* |
853 | * If we reach here, this is not a listening socket, so |
854 | * readability really means readability. |
855 | */ |
856 | |
857 | /* In the case the socket is still frozen, we don't even bother */ |
858 | if (s->frozen) { |
859 | s->frozen_readable = 1; |
860 | break; |
861 | } |
862 | |
863 | /* |
864 | * We have received data on the socket. For an oobinline |
865 | * socket, this might be data _before_ an urgent pointer, |
866 | * in which case we send it to the back end with type==1 |
867 | * (data prior to urgent). |
868 | */ |
869 | if (s->oobinline && s->oobpending) { |
870 | atmark = 1; |
871 | if (ioctl(s->s, SIOCATMARK, &atmark) == 0 && atmark) |
872 | s->oobpending = FALSE; /* clear this indicator */ |
873 | } else |
874 | atmark = 1; |
875 | |
56e5b2db |
876 | ret = recv(s->s, buf, s->oobpending ? 1 : sizeof(buf), 0); |
c5e438ec |
877 | noise_ultralight(ret); |
878 | if (ret < 0) { |
879 | if (errno == EWOULDBLOCK) { |
880 | break; |
881 | } |
882 | } |
883 | if (ret < 0) { |
884 | return plug_closing(s->plug, error_string(errno), errno, 0); |
885 | } else if (0 == ret) { |
886 | return plug_closing(s->plug, NULL, 0, 0); |
887 | } else { |
888 | return plug_receive(s->plug, atmark ? 0 : 1, buf, ret); |
889 | } |
890 | break; |
891 | case 2: /* writable */ |
051dd789 |
892 | if (!s->connected) { |
893 | /* |
894 | * select() reports a socket as _writable_ when an |
895 | * asynchronous connection is completed. |
896 | */ |
897 | s->connected = s->writable = 1; |
0ff9ea38 |
898 | uxsel_tell(s); |
051dd789 |
899 | break; |
900 | } else { |
c5e438ec |
901 | int bufsize_before, bufsize_after; |
902 | s->writable = 1; |
903 | bufsize_before = s->sending_oob + bufchain_size(&s->output_data); |
904 | try_send(s); |
905 | bufsize_after = s->sending_oob + bufchain_size(&s->output_data); |
906 | if (bufsize_after < bufsize_before) |
907 | plug_sent(s->plug, bufsize_after); |
908 | } |
909 | break; |
910 | } |
911 | |
912 | return 1; |
913 | } |
914 | |
915 | /* |
916 | * Deal with socket errors detected in try_send(). |
917 | */ |
918 | void net_pending_errors(void) |
919 | { |
920 | int i; |
921 | Actual_Socket s; |
922 | |
923 | /* |
924 | * This might be a fiddly business, because it's just possible |
925 | * that handling a pending error on one socket might cause |
926 | * others to be closed. (I can't think of any reason this might |
927 | * happen in current SSH implementation, but to maintain |
928 | * generality of this network layer I'll assume the worst.) |
929 | * |
930 | * So what we'll do is search the socket list for _one_ socket |
931 | * with a pending error, and then handle it, and then search |
932 | * the list again _from the beginning_. Repeat until we make a |
933 | * pass with no socket errors present. That way we are |
934 | * protected against the socket list changing under our feet. |
935 | */ |
936 | |
937 | do { |
938 | for (i = 0; (s = index234(sktree, i)) != NULL; i++) { |
939 | if (s->pending_error) { |
940 | /* |
941 | * An error has occurred on this socket. Pass it to the |
942 | * plug. |
943 | */ |
944 | plug_closing(s->plug, error_string(s->pending_error), |
945 | s->pending_error, 0); |
946 | break; |
947 | } |
948 | } |
949 | } while (s); |
950 | } |
951 | |
952 | /* |
953 | * Each socket abstraction contains a `void *' private field in |
954 | * which the client can keep state. |
955 | */ |
956 | static void sk_tcp_set_private_ptr(Socket sock, void *ptr) |
957 | { |
958 | Actual_Socket s = (Actual_Socket) sock; |
959 | s->private_ptr = ptr; |
960 | } |
961 | |
962 | static void *sk_tcp_get_private_ptr(Socket sock) |
963 | { |
964 | Actual_Socket s = (Actual_Socket) sock; |
965 | return s->private_ptr; |
966 | } |
967 | |
968 | /* |
969 | * Special error values are returned from sk_namelookup and sk_new |
970 | * if there's a problem. These functions extract an error message, |
971 | * or return NULL if there's no problem. |
972 | */ |
973 | char *sk_addr_error(SockAddr addr) |
974 | { |
975 | return addr->error; |
976 | } |
977 | static char *sk_tcp_socket_error(Socket sock) |
978 | { |
979 | Actual_Socket s = (Actual_Socket) sock; |
980 | return s->error; |
981 | } |
982 | |
983 | static void sk_tcp_set_frozen(Socket sock, int is_frozen) |
984 | { |
985 | Actual_Socket s = (Actual_Socket) sock; |
986 | if (s->frozen == is_frozen) |
987 | return; |
988 | s->frozen = is_frozen; |
989 | if (!is_frozen && s->frozen_readable) { |
990 | char c; |
991 | recv(s->s, &c, 1, MSG_PEEK); |
992 | } |
993 | s->frozen_readable = 0; |
0ff9ea38 |
994 | uxsel_tell(s); |
c5e438ec |
995 | } |
996 | |
0ff9ea38 |
997 | static void uxsel_tell(Actual_Socket s) |
c5e438ec |
998 | { |
0ff9ea38 |
999 | int rwx = 0; |
051dd789 |
1000 | if (!s->connected) |
0ff9ea38 |
1001 | rwx |= 2; /* write == connect */ |
c5e438ec |
1002 | if (s->connected && !s->frozen) |
0ff9ea38 |
1003 | rwx |= 1 | 4; /* read, except */ |
c5e438ec |
1004 | if (bufchain_size(&s->output_data)) |
0ff9ea38 |
1005 | rwx |= 2; /* write */ |
c5e438ec |
1006 | if (s->listener) |
0ff9ea38 |
1007 | rwx |= 1; /* read == accept */ |
1008 | uxsel_set(s->s, rwx, net_select_result); |
c5e438ec |
1009 | } |
1010 | |
1011 | int net_service_lookup(char *service) |
1012 | { |
1013 | struct servent *se; |
1014 | se = getservbyname(service, NULL); |
1015 | if (se != NULL) |
1016 | return ntohs(se->s_port); |
1017 | else |
1018 | return 0; |
1019 | } |