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> |
fc0f17db |
18 | #include <sys/un.h> |
c5e438ec |
19 | |
20 | #define DEFINE_PLUG_METHOD_MACROS |
21 | #include "putty.h" |
22 | #include "network.h" |
23 | #include "tree234.h" |
24 | |
fc0f17db |
25 | #ifndef X11_UNIX_PATH |
26 | # define X11_UNIX_PATH "/tmp/.X11-unix/X" |
27 | #endif |
28 | |
6ee9b735 |
29 | #define ipv4_is_loopback(addr) (inet_netof(addr) == IN_LOOPBACKNET) |
30 | |
c5e438ec |
31 | struct Socket_tag { |
32 | struct socket_function_table *fn; |
33 | /* the above variable absolutely *must* be the first in this structure */ |
cbe2d68f |
34 | const char *error; |
c5e438ec |
35 | int s; |
36 | Plug plug; |
37 | void *private_ptr; |
38 | bufchain output_data; |
39 | int connected; |
40 | int writable; |
41 | int frozen; /* this causes readability notifications to be ignored */ |
42 | int frozen_readable; /* this means we missed at least one readability |
43 | * notification while we were frozen */ |
44 | int localhost_only; /* for listening sockets */ |
45 | char oobdata[1]; |
46 | int sending_oob; |
47 | int oobpending; /* is there OOB data available to read? */ |
48 | int oobinline; |
49 | int pending_error; /* in case send() returns error */ |
50 | int listener; |
51 | }; |
52 | |
53 | /* |
54 | * We used to typedef struct Socket_tag *Socket. |
55 | * |
56 | * Since we have made the networking abstraction slightly more |
57 | * abstract, Socket no longer means a tcp socket (it could mean |
58 | * an ssl socket). So now we must use Actual_Socket when we know |
59 | * we are talking about a tcp socket. |
60 | */ |
61 | typedef struct Socket_tag *Actual_Socket; |
62 | |
63 | struct SockAddr_tag { |
cbe2d68f |
64 | const char *error; |
b7a189f3 |
65 | /* |
66 | * Which address family this address belongs to. AF_INET for |
67 | * IPv4; AF_INET6 for IPv6; AF_UNSPEC indicates that name |
68 | * resolution has not been done and a simple host name is held |
69 | * in this SockAddr structure. |
70 | */ |
c5e438ec |
71 | int family; |
05581745 |
72 | #ifndef NO_IPV6 |
c5e438ec |
73 | struct addrinfo *ai; /* Address IPv6 style. */ |
792c5eb5 |
74 | #else |
75 | unsigned long address; /* Address IPv4 style. */ |
c5e438ec |
76 | #endif |
b7a189f3 |
77 | char hostname[512]; /* Store an unresolved host name. */ |
c5e438ec |
78 | }; |
79 | |
80 | static tree234 *sktree; |
81 | |
0ff9ea38 |
82 | static void uxsel_tell(Actual_Socket s); |
83 | |
c5e438ec |
84 | static int cmpfortree(void *av, void *bv) |
85 | { |
86 | Actual_Socket a = (Actual_Socket) av, b = (Actual_Socket) bv; |
87 | int as = a->s, bs = b->s; |
88 | if (as < bs) |
89 | return -1; |
90 | if (as > bs) |
91 | return +1; |
92 | return 0; |
93 | } |
94 | |
95 | static int cmpforsearch(void *av, void *bv) |
96 | { |
97 | Actual_Socket b = (Actual_Socket) bv; |
f7f9fb5c |
98 | int as = *(int *)av, bs = b->s; |
c5e438ec |
99 | if (as < bs) |
100 | return -1; |
101 | if (as > bs) |
102 | return +1; |
103 | return 0; |
104 | } |
105 | |
106 | void sk_init(void) |
107 | { |
108 | sktree = newtree234(cmpfortree); |
109 | } |
110 | |
111 | void sk_cleanup(void) |
112 | { |
113 | Actual_Socket s; |
114 | int i; |
115 | |
116 | if (sktree) { |
117 | for (i = 0; (s = index234(sktree, i)) != NULL; i++) { |
118 | close(s->s); |
119 | } |
120 | } |
121 | } |
122 | |
cbe2d68f |
123 | const char *error_string(int error) |
c5e438ec |
124 | { |
e266735f |
125 | return strerror(error); |
c5e438ec |
126 | } |
127 | |
05581745 |
128 | SockAddr sk_namelookup(const char *host, char **canonicalname, int address_family) |
c5e438ec |
129 | { |
3d88e64d |
130 | SockAddr ret = snew(struct SockAddr_tag); |
05581745 |
131 | #ifndef NO_IPV6 |
792c5eb5 |
132 | struct addrinfo hints; |
133 | int err; |
134 | #else |
c5e438ec |
135 | unsigned long a; |
136 | struct hostent *h = NULL; |
792c5eb5 |
137 | #endif |
c5e438ec |
138 | char realhost[8192]; |
139 | |
140 | /* Clear the structure and default to IPv4. */ |
141 | memset(ret, 0, sizeof(struct SockAddr_tag)); |
142 | ret->family = 0; /* We set this one when we have resolved the host. */ |
143 | *realhost = '\0'; |
144 | ret->error = NULL; |
145 | |
05581745 |
146 | #ifndef NO_IPV6 |
792c5eb5 |
147 | hints.ai_flags = AI_CANONNAME; |
81b34354 |
148 | hints.ai_family = (address_family == ADDRTYPE_IPV4 ? AF_INET : |
149 | address_family == ADDRTYPE_IPV6 ? AF_INET6 : |
150 | AF_UNSPEC); |
151 | hints.ai_socktype = SOCK_STREAM; |
792c5eb5 |
152 | hints.ai_protocol = 0; |
153 | hints.ai_addrlen = 0; |
154 | hints.ai_addr = NULL; |
155 | hints.ai_canonname = NULL; |
156 | hints.ai_next = NULL; |
72b364a8 |
157 | err = getaddrinfo(host, NULL, &hints, &ret->ai); |
792c5eb5 |
158 | if (err != 0) { |
159 | ret->error = gai_strerror(err); |
160 | return ret; |
161 | } |
162 | ret->family = ret->ai->ai_family; |
163 | *realhost = '\0'; |
164 | if (ret->ai->ai_canonname != NULL) |
165 | strncat(realhost, ret->ai->ai_canonname, sizeof(realhost) - 1); |
166 | else |
167 | strncat(realhost, host, sizeof(realhost) - 1); |
168 | #else |
169 | if ((a = inet_addr(host)) == (unsigned long) INADDR_NONE) { |
170 | /* |
171 | * Otherwise use the IPv4-only gethostbyname... (NOTE: |
172 | * we don't use gethostbyname as a fallback!) |
173 | */ |
174 | if (ret->family == 0) { |
c5e438ec |
175 | /*debug(("Resolving \"%s\" with gethostbyname() (IPv4 only)...\n", host)); */ |
176 | if ( (h = gethostbyname(host)) ) |
792c5eb5 |
177 | ret->family = AF_INET; |
178 | } |
179 | if (ret->family == 0) { |
c5e438ec |
180 | ret->error = (h_errno == HOST_NOT_FOUND || |
792c5eb5 |
181 | h_errno == NO_DATA || |
182 | h_errno == NO_ADDRESS ? "Host does not exist" : |
183 | h_errno == TRY_AGAIN ? |
184 | "Temporary name service failure" : |
185 | "gethostbyname: unknown error"); |
8c43874c |
186 | return ret; |
c5e438ec |
187 | } |
792c5eb5 |
188 | memcpy(&a, h->h_addr, sizeof(a)); |
189 | /* This way we are always sure the h->h_name is valid :) */ |
190 | strncpy(realhost, h->h_name, sizeof(realhost)); |
c5e438ec |
191 | } else { |
192 | /* |
193 | * This must be a numeric IPv4 address because it caused a |
194 | * success return from inet_addr. |
195 | */ |
196 | ret->family = AF_INET; |
197 | strncpy(realhost, host, sizeof(realhost)); |
198 | } |
199 | ret->address = ntohl(a); |
792c5eb5 |
200 | #endif |
c5e438ec |
201 | realhost[lenof(realhost)-1] = '\0'; |
3d88e64d |
202 | *canonicalname = snewn(1+strlen(realhost), char); |
c5e438ec |
203 | strcpy(*canonicalname, realhost); |
204 | return ret; |
205 | } |
206 | |
e8fa8f62 |
207 | SockAddr sk_nonamelookup(const char *host) |
b7a189f3 |
208 | { |
3d88e64d |
209 | SockAddr ret = snew(struct SockAddr_tag); |
ab0873ab |
210 | ret->error = NULL; |
b7a189f3 |
211 | ret->family = AF_UNSPEC; |
212 | strncpy(ret->hostname, host, lenof(ret->hostname)); |
213 | ret->hostname[lenof(ret->hostname)-1] = '\0'; |
e14d27a1 |
214 | #ifndef NO_IPV6 |
215 | ret->ai = NULL; |
216 | #endif |
b7a189f3 |
217 | return ret; |
218 | } |
219 | |
c5e438ec |
220 | void sk_getaddr(SockAddr addr, char *buf, int buflen) |
221 | { |
792c5eb5 |
222 | |
223 | if (addr->family == AF_UNSPEC) { |
224 | strncpy(buf, addr->hostname, buflen); |
225 | buf[buflen-1] = '\0'; |
226 | } else { |
05581745 |
227 | #ifndef NO_IPV6 |
792c5eb5 |
228 | if (getnameinfo(addr->ai->ai_addr, addr->ai->ai_addrlen, buf, buflen, |
229 | NULL, 0, NI_NUMERICHOST) != 0) { |
230 | buf[0] = '\0'; |
231 | strncat(buf, "<unknown>", buflen - 1); |
232 | } |
233 | #else |
c5e438ec |
234 | struct in_addr a; |
792c5eb5 |
235 | assert(addr->family == AF_INET); |
c5e438ec |
236 | a.s_addr = htonl(addr->address); |
237 | strncpy(buf, inet_ntoa(a), buflen); |
b7a189f3 |
238 | buf[buflen-1] = '\0'; |
792c5eb5 |
239 | #endif |
c5e438ec |
240 | } |
c5e438ec |
241 | } |
242 | |
b804e1e5 |
243 | int sk_hostname_is_local(char *name) |
244 | { |
245 | return !strcmp(name, "localhost"); |
246 | } |
247 | |
248 | int sk_address_is_local(SockAddr addr) |
249 | { |
792c5eb5 |
250 | |
251 | if (addr->family == AF_UNSPEC) |
252 | return 0; /* we don't know; assume not */ |
253 | else { |
05581745 |
254 | #ifndef NO_IPV6 |
792c5eb5 |
255 | if (addr->family == AF_INET) |
256 | return ipv4_is_loopback( |
257 | ((struct sockaddr_in *)addr->ai->ai_addr)->sin_addr); |
258 | else if (addr->family == AF_INET6) |
259 | return IN6_IS_ADDR_LOOPBACK( |
260 | &((struct sockaddr_in6 *)addr->ai->ai_addr)->sin6_addr); |
261 | else |
262 | return 0; |
263 | #else |
b804e1e5 |
264 | struct in_addr a; |
792c5eb5 |
265 | assert(addr->family == AF_INET); |
b804e1e5 |
266 | a.s_addr = htonl(addr->address); |
267 | return ipv4_is_loopback(a); |
792c5eb5 |
268 | #endif |
b804e1e5 |
269 | } |
b804e1e5 |
270 | } |
271 | |
c5e438ec |
272 | int sk_addrtype(SockAddr addr) |
273 | { |
b7a189f3 |
274 | return (addr->family == AF_INET ? ADDRTYPE_IPV4 : |
05581745 |
275 | #ifndef NO_IPV6 |
b7a189f3 |
276 | addr->family == AF_INET6 ? ADDRTYPE_IPV6 : |
277 | #endif |
278 | ADDRTYPE_NAME); |
c5e438ec |
279 | } |
280 | |
281 | void sk_addrcopy(SockAddr addr, char *buf) |
282 | { |
792c5eb5 |
283 | |
05581745 |
284 | #ifndef NO_IPV6 |
792c5eb5 |
285 | if (addr->family == AF_INET) |
286 | memcpy(buf, &((struct sockaddr_in *)addr->ai->ai_addr)->sin_addr, |
287 | sizeof(struct in_addr)); |
288 | else if (addr->family == AF_INET6) |
289 | memcpy(buf, &((struct sockaddr_in6 *)addr->ai->ai_addr)->sin6_addr, |
290 | sizeof(struct in6_addr)); |
291 | else |
292 | assert(FALSE); |
293 | #else |
294 | struct in_addr a; |
295 | |
296 | assert(addr->family == AF_INET); |
297 | a.s_addr = htonl(addr->address); |
298 | memcpy(buf, (char*) &a.s_addr, 4); |
c5e438ec |
299 | #endif |
c5e438ec |
300 | } |
301 | |
302 | void sk_addr_free(SockAddr addr) |
303 | { |
792c5eb5 |
304 | |
05581745 |
305 | #ifndef NO_IPV6 |
792c5eb5 |
306 | if (addr->ai != NULL) |
307 | freeaddrinfo(addr->ai); |
308 | #endif |
c5e438ec |
309 | sfree(addr); |
310 | } |
311 | |
312 | static Plug sk_tcp_plug(Socket sock, Plug p) |
313 | { |
314 | Actual_Socket s = (Actual_Socket) sock; |
315 | Plug ret = s->plug; |
316 | if (p) |
317 | s->plug = p; |
318 | return ret; |
319 | } |
320 | |
321 | static void sk_tcp_flush(Socket s) |
322 | { |
323 | /* |
324 | * We send data to the socket as soon as we can anyway, |
325 | * so we don't need to do anything here. :-) |
326 | */ |
327 | } |
328 | |
329 | static void sk_tcp_close(Socket s); |
e0e7dff8 |
330 | static int sk_tcp_write(Socket s, const char *data, int len); |
331 | static int sk_tcp_write_oob(Socket s, const char *data, int len); |
c5e438ec |
332 | static void sk_tcp_set_private_ptr(Socket s, void *ptr); |
333 | static void *sk_tcp_get_private_ptr(Socket s); |
334 | static void sk_tcp_set_frozen(Socket s, int is_frozen); |
cbe2d68f |
335 | static const char *sk_tcp_socket_error(Socket s); |
c5e438ec |
336 | |
2f92b717 |
337 | static struct socket_function_table tcp_fn_table = { |
338 | sk_tcp_plug, |
339 | sk_tcp_close, |
340 | sk_tcp_write, |
341 | sk_tcp_write_oob, |
342 | sk_tcp_flush, |
343 | sk_tcp_set_private_ptr, |
344 | sk_tcp_get_private_ptr, |
345 | sk_tcp_set_frozen, |
346 | sk_tcp_socket_error |
347 | }; |
348 | |
f7f9fb5c |
349 | Socket sk_register(OSSocket sockfd, Plug plug) |
c5e438ec |
350 | { |
c5e438ec |
351 | Actual_Socket ret; |
352 | |
353 | /* |
354 | * Create Socket structure. |
355 | */ |
3d88e64d |
356 | ret = snew(struct Socket_tag); |
2f92b717 |
357 | ret->fn = &tcp_fn_table; |
c5e438ec |
358 | ret->error = NULL; |
359 | ret->plug = plug; |
360 | bufchain_init(&ret->output_data); |
361 | ret->writable = 1; /* to start with */ |
362 | ret->sending_oob = 0; |
363 | ret->frozen = 1; |
364 | ret->frozen_readable = 0; |
365 | ret->localhost_only = 0; /* unused, but best init anyway */ |
366 | ret->pending_error = 0; |
367 | ret->oobpending = FALSE; |
368 | ret->listener = 0; |
369 | |
f7f9fb5c |
370 | ret->s = sockfd; |
c5e438ec |
371 | |
372 | if (ret->s < 0) { |
373 | ret->error = error_string(errno); |
374 | return (Socket) ret; |
375 | } |
376 | |
377 | ret->oobinline = 0; |
378 | |
0ff9ea38 |
379 | uxsel_tell(ret); |
c5e438ec |
380 | add234(sktree, ret); |
381 | |
382 | return (Socket) ret; |
383 | } |
384 | |
385 | Socket sk_new(SockAddr addr, int port, int privport, int oobinline, |
79bf227b |
386 | int nodelay, int keepalive, Plug plug) |
c5e438ec |
387 | { |
c5e438ec |
388 | int s; |
05581745 |
389 | #ifndef NO_IPV6 |
c5e438ec |
390 | struct sockaddr_in6 a6; |
391 | #endif |
392 | struct sockaddr_in a; |
fc0f17db |
393 | struct sockaddr_un au; |
394 | const struct sockaddr *sa; |
c5e438ec |
395 | int err; |
396 | Actual_Socket ret; |
397 | short localport; |
fc0f17db |
398 | int fl, salen; |
c5e438ec |
399 | |
400 | /* |
401 | * Create Socket structure. |
402 | */ |
3d88e64d |
403 | ret = snew(struct Socket_tag); |
2f92b717 |
404 | ret->fn = &tcp_fn_table; |
c5e438ec |
405 | ret->error = NULL; |
406 | ret->plug = plug; |
407 | bufchain_init(&ret->output_data); |
408 | ret->connected = 0; /* to start with */ |
409 | ret->writable = 0; /* to start with */ |
410 | ret->sending_oob = 0; |
411 | ret->frozen = 0; |
412 | ret->frozen_readable = 0; |
413 | ret->localhost_only = 0; /* unused, but best init anyway */ |
414 | ret->pending_error = 0; |
415 | ret->oobpending = FALSE; |
416 | ret->listener = 0; |
417 | |
418 | /* |
419 | * Open socket. |
420 | */ |
b7a189f3 |
421 | assert(addr->family != AF_UNSPEC); |
c5e438ec |
422 | s = socket(addr->family, SOCK_STREAM, 0); |
423 | ret->s = s; |
424 | |
425 | if (s < 0) { |
426 | ret->error = error_string(errno); |
427 | return (Socket) ret; |
428 | } |
429 | |
430 | ret->oobinline = oobinline; |
431 | if (oobinline) { |
432 | int b = TRUE; |
433 | setsockopt(s, SOL_SOCKET, SO_OOBINLINE, (void *) &b, sizeof(b)); |
434 | } |
435 | |
436 | if (nodelay) { |
437 | int b = TRUE; |
438 | setsockopt(s, IPPROTO_TCP, TCP_NODELAY, (void *) &b, sizeof(b)); |
439 | } |
440 | |
79bf227b |
441 | if (keepalive) { |
442 | int b = TRUE; |
443 | setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, (void *) &b, sizeof(b)); |
444 | } |
445 | |
c5e438ec |
446 | /* |
447 | * Bind to local address. |
448 | */ |
449 | if (privport) |
450 | localport = 1023; /* count from 1023 downwards */ |
451 | else |
452 | localport = 0; /* just use port 0 (ie kernel picks) */ |
453 | |
d2c29274 |
454 | /* BSD IP stacks need sockaddr_in zeroed before filling in */ |
455 | memset(&a,'\0',sizeof(struct sockaddr_in)); |
05581745 |
456 | #ifndef NO_IPV6 |
d2c29274 |
457 | memset(&a6,'\0',sizeof(struct sockaddr_in6)); |
458 | #endif |
fc0f17db |
459 | |
460 | /* We don't try to bind to a local address for UNIX domain sockets. (Why |
461 | * do we bother doing the bind when localport == 0 anyway?) */ |
462 | if(addr->family != AF_UNIX) { |
463 | /* Loop round trying to bind */ |
464 | while (1) { |
465 | int retcode; |
c5e438ec |
466 | |
05581745 |
467 | #ifndef NO_IPV6 |
fc0f17db |
468 | if (addr->family == AF_INET6) { |
469 | /* XXX use getaddrinfo to get a local address? */ |
470 | a6.sin6_family = AF_INET6; |
471 | a6.sin6_addr = in6addr_any; |
472 | a6.sin6_port = htons(localport); |
473 | retcode = bind(s, (struct sockaddr *) &a6, sizeof(a6)); |
474 | } else |
c5e438ec |
475 | #endif |
fc0f17db |
476 | { |
477 | assert(addr->family == AF_INET); |
478 | a.sin_family = AF_INET; |
479 | a.sin_addr.s_addr = htonl(INADDR_ANY); |
480 | a.sin_port = htons(localport); |
481 | retcode = bind(s, (struct sockaddr *) &a, sizeof(a)); |
482 | } |
483 | if (retcode >= 0) { |
484 | err = 0; |
485 | break; /* done */ |
486 | } else { |
487 | err = errno; |
488 | if (err != EADDRINUSE) /* failed, for a bad reason */ |
489 | break; |
490 | } |
491 | |
492 | if (localport == 0) |
493 | break; /* we're only looping once */ |
494 | localport--; |
495 | if (localport == 0) |
496 | break; /* we might have got to the end */ |
c5e438ec |
497 | } |
fc0f17db |
498 | |
499 | if (err) { |
500 | ret->error = error_string(err); |
501 | return (Socket) ret; |
c5e438ec |
502 | } |
c5e438ec |
503 | } |
504 | |
505 | /* |
506 | * Connect to remote address. |
507 | */ |
fc0f17db |
508 | switch(addr->family) { |
05581745 |
509 | #ifndef NO_IPV6 |
fc0f17db |
510 | case AF_INET: |
511 | /* XXX would be better to have got getaddrinfo() to fill in the port. */ |
792c5eb5 |
512 | ((struct sockaddr_in *)addr->ai->ai_addr)->sin_port = |
513 | htons(port); |
fc0f17db |
514 | sa = (const struct sockaddr *)addr->ai->ai_addr; |
515 | salen = addr->ai->ai_addrlen; |
516 | break; |
517 | case AF_INET6: |
792c5eb5 |
518 | ((struct sockaddr_in *)addr->ai->ai_addr)->sin_port = |
519 | htons(port); |
fc0f17db |
520 | sa = (const struct sockaddr *)addr->ai->ai_addr; |
521 | salen = addr->ai->ai_addrlen; |
522 | break; |
792c5eb5 |
523 | #else |
fc0f17db |
524 | case AF_INET: |
525 | a.sin_family = AF_INET; |
526 | a.sin_addr.s_addr = htonl(addr->address); |
527 | a.sin_port = htons((short) port); |
528 | sa = (const struct sockaddr *)&a; |
529 | salen = sizeof a; |
530 | break; |
792c5eb5 |
531 | #endif |
fc0f17db |
532 | case AF_UNIX: |
533 | assert(port == 0); /* to catch confused people */ |
534 | assert(strlen(addr->hostname) < sizeof au.sun_path); |
535 | memset(&au, 0, sizeof au); |
536 | au.sun_family = AF_UNIX; |
537 | strcpy(au.sun_path, addr->hostname); |
538 | sa = (const struct sockaddr *)&au; |
539 | salen = sizeof au; |
540 | break; |
541 | |
542 | default: |
543 | assert(0 && "unknown address family"); |
544 | } |
4b70e70e |
545 | |
546 | fl = fcntl(s, F_GETFL); |
547 | if (fl != -1) |
548 | fcntl(s, F_SETFL, fl | O_NONBLOCK); |
051dd789 |
549 | |
fc0f17db |
550 | if ((connect(s, sa, salen)) < 0) { |
051dd789 |
551 | if ( errno != EINPROGRESS ) { |
c5e438ec |
552 | ret->error = error_string(errno); |
553 | return (Socket) ret; |
554 | } |
555 | } else { |
556 | /* |
557 | * If we _don't_ get EWOULDBLOCK, the connect has completed |
558 | * and we should set the socket as connected and writable. |
559 | */ |
560 | ret->connected = 1; |
561 | ret->writable = 1; |
562 | } |
563 | |
0ff9ea38 |
564 | uxsel_tell(ret); |
c5e438ec |
565 | add234(sktree, ret); |
566 | |
f85e6f6e |
567 | sk_addr_free(addr); |
568 | |
c5e438ec |
569 | return (Socket) ret; |
570 | } |
571 | |
05581745 |
572 | Socket sk_newlistener(char *srcaddr, int port, Plug plug, int local_host_only, int address_family) |
c5e438ec |
573 | { |
c5e438ec |
574 | int s; |
05581745 |
575 | #ifndef NO_IPV6 |
792c5eb5 |
576 | struct addrinfo hints, *ai; |
577 | char portstr[6]; |
578 | #endif |
c5e438ec |
579 | struct sockaddr_in a; |
580 | int err; |
581 | Actual_Socket ret; |
582 | int retcode; |
583 | int on = 1; |
584 | |
585 | /* |
586 | * Create Socket structure. |
587 | */ |
3d88e64d |
588 | ret = snew(struct Socket_tag); |
2f92b717 |
589 | ret->fn = &tcp_fn_table; |
c5e438ec |
590 | ret->error = NULL; |
591 | ret->plug = plug; |
592 | bufchain_init(&ret->output_data); |
593 | ret->writable = 0; /* to start with */ |
594 | ret->sending_oob = 0; |
595 | ret->frozen = 0; |
596 | ret->frozen_readable = 0; |
597 | ret->localhost_only = local_host_only; |
598 | ret->pending_error = 0; |
599 | ret->oobpending = FALSE; |
600 | ret->listener = 1; |
601 | |
602 | /* |
05581745 |
603 | * Translate address_family from platform-independent constants |
604 | * into local reality. |
605 | */ |
606 | address_family = (address_family == ADDRTYPE_IPV4 ? AF_INET : |
607 | address_family == ADDRTYPE_IPV6 ? AF_INET6 : AF_UNSPEC); |
608 | |
609 | #ifndef NO_IPV6 |
610 | /* Let's default to IPv6. |
611 | * If the stack doesn't support IPv6, we will fall back to IPv4. */ |
612 | if (address_family == AF_UNSPEC) address_family = AF_INET6; |
613 | #else |
614 | /* No other choice, default to IPv4 */ |
615 | if (address_family == AF_UNSPEC) address_family = AF_INET; |
616 | #endif |
617 | |
618 | /* |
c5e438ec |
619 | * Open socket. |
620 | */ |
05581745 |
621 | s = socket(address_family, SOCK_STREAM, 0); |
622 | |
623 | /* If the host doesn't support IPv6 try fallback to IPv4. */ |
624 | if (s < 0 && address_family == AF_INET6) { |
625 | address_family = AF_INET; |
626 | s = socket(address_family, SOCK_STREAM, 0); |
627 | } |
c5e438ec |
628 | ret->s = s; |
629 | |
630 | if (s < 0) { |
631 | ret->error = error_string(errno); |
632 | return (Socket) ret; |
633 | } |
634 | |
635 | ret->oobinline = 0; |
636 | |
637 | setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (const char *)&on, sizeof(on)); |
638 | |
d2c29274 |
639 | /* BSD IP stacks need sockaddr_in zeroed before filling in */ |
640 | memset(&a,'\0',sizeof(struct sockaddr_in)); |
05581745 |
641 | #ifndef NO_IPV6 |
d2c29274 |
642 | #if 0 |
643 | memset(&a6,'\0',sizeof(struct sockaddr_in6)); |
644 | #endif |
792c5eb5 |
645 | hints.ai_flags = AI_NUMERICHOST; |
05581745 |
646 | hints.ai_family = address_family; |
792c5eb5 |
647 | hints.ai_socktype = 0; |
648 | hints.ai_protocol = 0; |
649 | hints.ai_addrlen = 0; |
650 | hints.ai_addr = NULL; |
651 | hints.ai_canonname = NULL; |
652 | hints.ai_next = NULL; |
653 | sprintf(portstr, "%d", port); |
654 | if (srcaddr != NULL && getaddrinfo(srcaddr, portstr, &hints, &ai) == 0) |
655 | retcode = bind(s, ai->ai_addr, ai->ai_addrlen); |
656 | else |
657 | #if 0 |
658 | { |
659 | /* |
660 | * FIXME: Need two listening sockets, in principle, one for v4 |
661 | * and one for v6 |
662 | */ |
c5e438ec |
663 | if (local_host_only) |
664 | a6.sin6_addr = in6addr_loopback; |
665 | else |
666 | a6.sin6_addr = in6addr_any; |
667 | a6.sin6_port = htons(port); |
668 | } else |
669 | #endif |
792c5eb5 |
670 | #endif |
c5e438ec |
671 | { |
6ee9b735 |
672 | int got_addr = 0; |
c5e438ec |
673 | a.sin_family = AF_INET; |
6ee9b735 |
674 | |
675 | /* |
676 | * Bind to source address. First try an explicitly |
677 | * specified one... |
678 | */ |
679 | if (srcaddr) { |
680 | a.sin_addr.s_addr = inet_addr(srcaddr); |
681 | if (a.sin_addr.s_addr != INADDR_NONE) { |
682 | /* Override localhost_only with specified listen addr. */ |
683 | ret->localhost_only = ipv4_is_loopback(a.sin_addr); |
684 | got_addr = 1; |
685 | } |
686 | } |
687 | |
688 | /* |
689 | * ... and failing that, go with one of the standard ones. |
690 | */ |
691 | if (!got_addr) { |
692 | if (local_host_only) |
693 | a.sin_addr.s_addr = htonl(INADDR_LOOPBACK); |
694 | else |
695 | a.sin_addr.s_addr = htonl(INADDR_ANY); |
696 | } |
697 | |
c5e438ec |
698 | a.sin_port = htons((short)port); |
792c5eb5 |
699 | retcode = bind(s, (struct sockaddr *) &a, sizeof(a)); |
c5e438ec |
700 | } |
792c5eb5 |
701 | |
c5e438ec |
702 | if (retcode >= 0) { |
703 | err = 0; |
704 | } else { |
705 | err = errno; |
706 | } |
707 | |
708 | if (err) { |
709 | ret->error = error_string(err); |
710 | return (Socket) ret; |
711 | } |
712 | |
713 | |
714 | if (listen(s, SOMAXCONN) < 0) { |
715 | close(s); |
716 | ret->error = error_string(errno); |
717 | return (Socket) ret; |
718 | } |
719 | |
0ff9ea38 |
720 | uxsel_tell(ret); |
c5e438ec |
721 | add234(sktree, ret); |
722 | |
723 | return (Socket) ret; |
724 | } |
725 | |
726 | static void sk_tcp_close(Socket sock) |
727 | { |
728 | Actual_Socket s = (Actual_Socket) sock; |
729 | |
0ff9ea38 |
730 | uxsel_del(s->s); |
c5e438ec |
731 | del234(sktree, s); |
732 | close(s->s); |
733 | sfree(s); |
734 | } |
735 | |
2f92b717 |
736 | int sk_getxdmdata(void *sock, unsigned long *ip, int *port) |
737 | { |
738 | Actual_Socket s = (Actual_Socket) sock; |
739 | struct sockaddr_in addr; |
740 | socklen_t addrlen; |
741 | |
742 | /* |
743 | * We must check that this socket really _is_ an Actual_Socket. |
744 | */ |
745 | if (s->fn != &tcp_fn_table) |
746 | return 0; /* failure */ |
747 | |
2f92b717 |
748 | addrlen = sizeof(addr); |
fc0f17db |
749 | if (getsockname(s->s, (struct sockaddr *)&addr, &addrlen) < 0) |
2f92b717 |
750 | return 0; |
fc0f17db |
751 | switch(addr.sin_family) { |
752 | case AF_INET: |
753 | *ip = ntohl(addr.sin_addr.s_addr); |
754 | *port = ntohs(addr.sin_port); |
755 | break; |
756 | case AF_UNIX: |
757 | /* |
758 | * For a Unix socket, we return 0xFFFFFFFF for the IP address and |
759 | * our current pid for the port. Bizarre, but such is life. |
760 | */ |
761 | *ip = ntohl(0xFFFFFFFF); |
762 | *port = getpid(); |
763 | break; |
2f92b717 |
764 | |
fc0f17db |
765 | /* XXX IPV6 */ |
766 | |
767 | default: |
768 | return 0; |
769 | } |
2f92b717 |
770 | |
771 | return 1; |
772 | } |
773 | |
c5e438ec |
774 | /* |
775 | * The function which tries to send on a socket once it's deemed |
776 | * writable. |
777 | */ |
778 | void try_send(Actual_Socket s) |
779 | { |
780 | while (s->sending_oob || bufchain_size(&s->output_data) > 0) { |
781 | int nsent; |
782 | int err; |
783 | void *data; |
784 | int len, urgentflag; |
785 | |
786 | if (s->sending_oob) { |
787 | urgentflag = MSG_OOB; |
788 | len = s->sending_oob; |
789 | data = &s->oobdata; |
790 | } else { |
791 | urgentflag = 0; |
792 | bufchain_prefix(&s->output_data, &data, &len); |
793 | } |
794 | nsent = send(s->s, data, len, urgentflag); |
795 | noise_ultralight(nsent); |
796 | if (nsent <= 0) { |
797 | err = (nsent < 0 ? errno : 0); |
798 | if (err == EWOULDBLOCK) { |
799 | /* |
800 | * Perfectly normal: we've sent all we can for the moment. |
801 | */ |
802 | s->writable = FALSE; |
803 | return; |
804 | } else if (nsent == 0 || |
805 | err == ECONNABORTED || err == ECONNRESET) { |
806 | /* |
807 | * If send() returns CONNABORTED or CONNRESET, we |
808 | * unfortunately can't just call plug_closing(), |
809 | * because it's quite likely that we're currently |
810 | * _in_ a call from the code we'd be calling back |
811 | * to, so we'd have to make half the SSH code |
812 | * reentrant. Instead we flag a pending error on |
813 | * the socket, to be dealt with (by calling |
814 | * plug_closing()) at some suitable future moment. |
815 | */ |
816 | s->pending_error = err; |
817 | return; |
818 | } else { |
819 | /* We're inside the Unix frontend here, so we know |
820 | * that the frontend handle is unnecessary. */ |
821 | logevent(NULL, error_string(err)); |
822 | fatalbox("%s", error_string(err)); |
823 | } |
824 | } else { |
825 | if (s->sending_oob) { |
826 | if (nsent < len) { |
827 | memmove(s->oobdata, s->oobdata+nsent, len-nsent); |
828 | s->sending_oob = len - nsent; |
829 | } else { |
830 | s->sending_oob = 0; |
831 | } |
832 | } else { |
833 | bufchain_consume(&s->output_data, nsent); |
834 | } |
835 | } |
836 | } |
0ff9ea38 |
837 | uxsel_tell(s); |
c5e438ec |
838 | } |
839 | |
e0e7dff8 |
840 | static int sk_tcp_write(Socket sock, const char *buf, int len) |
c5e438ec |
841 | { |
842 | Actual_Socket s = (Actual_Socket) sock; |
843 | |
844 | /* |
845 | * Add the data to the buffer list on the socket. |
846 | */ |
847 | bufchain_add(&s->output_data, buf, len); |
848 | |
849 | /* |
850 | * Now try sending from the start of the buffer list. |
851 | */ |
852 | if (s->writable) |
853 | try_send(s); |
854 | |
c2a71b0d |
855 | /* |
856 | * Update the select() status to correctly reflect whether or |
857 | * not we should be selecting for write. |
858 | */ |
859 | uxsel_tell(s); |
860 | |
c5e438ec |
861 | return bufchain_size(&s->output_data); |
862 | } |
863 | |
e0e7dff8 |
864 | static int sk_tcp_write_oob(Socket sock, const char *buf, int len) |
c5e438ec |
865 | { |
866 | Actual_Socket s = (Actual_Socket) sock; |
867 | |
868 | /* |
869 | * Replace the buffer list on the socket with the data. |
870 | */ |
871 | bufchain_clear(&s->output_data); |
872 | assert(len <= sizeof(s->oobdata)); |
873 | memcpy(s->oobdata, buf, len); |
874 | s->sending_oob = len; |
875 | |
876 | /* |
877 | * Now try sending from the start of the buffer list. |
878 | */ |
879 | if (s->writable) |
880 | try_send(s); |
881 | |
c2a71b0d |
882 | /* |
883 | * Update the select() status to correctly reflect whether or |
884 | * not we should be selecting for write. |
885 | */ |
886 | uxsel_tell(s); |
887 | |
c5e438ec |
888 | return s->sending_oob; |
889 | } |
890 | |
0ff9ea38 |
891 | static int net_select_result(int fd, int event) |
c5e438ec |
892 | { |
893 | int ret; |
894 | int err; |
895 | char buf[20480]; /* nice big buffer for plenty of speed */ |
896 | Actual_Socket s; |
897 | u_long atmark; |
898 | |
899 | /* Find the Socket structure */ |
f7f9fb5c |
900 | s = find234(sktree, &fd, cmpforsearch); |
c5e438ec |
901 | if (!s) |
902 | return 1; /* boggle */ |
903 | |
904 | noise_ultralight(event); |
905 | |
906 | switch (event) { |
c5e438ec |
907 | case 4: /* exceptional */ |
908 | if (!s->oobinline) { |
909 | /* |
910 | * On a non-oobinline socket, this indicates that we |
911 | * can immediately perform an OOB read and get back OOB |
912 | * data, which we will send to the back end with |
913 | * type==2 (urgent data). |
914 | */ |
915 | ret = recv(s->s, buf, sizeof(buf), MSG_OOB); |
916 | noise_ultralight(ret); |
917 | if (ret <= 0) { |
cbe2d68f |
918 | const char *str = (ret == 0 ? "Internal networking trouble" : |
919 | error_string(errno)); |
c5e438ec |
920 | /* We're inside the Unix frontend here, so we know |
921 | * that the frontend handle is unnecessary. */ |
922 | logevent(NULL, str); |
923 | fatalbox("%s", str); |
924 | } else { |
925 | return plug_receive(s->plug, 2, buf, ret); |
926 | } |
927 | break; |
928 | } |
929 | |
930 | /* |
931 | * If we reach here, this is an oobinline socket, which |
56e5b2db |
932 | * means we should set s->oobpending and then deal with it |
933 | * when we get called for the readability event (which |
934 | * should also occur). |
c5e438ec |
935 | */ |
936 | s->oobpending = TRUE; |
56e5b2db |
937 | break; |
c5e438ec |
938 | case 1: /* readable; also acceptance */ |
939 | if (s->listener) { |
940 | /* |
941 | * On a listening socket, the readability event means a |
942 | * connection is ready to be accepted. |
943 | */ |
944 | struct sockaddr_in isa; |
945 | int addrlen = sizeof(struct sockaddr_in); |
946 | int t; /* socket of connection */ |
947 | |
948 | memset(&isa, 0, sizeof(struct sockaddr_in)); |
949 | err = 0; |
776792d7 |
950 | t = accept(s->s,(struct sockaddr *)&isa,(socklen_t *) &addrlen); |
c5e438ec |
951 | if (t < 0) { |
952 | break; |
953 | } |
954 | |
6ee9b735 |
955 | if (s->localhost_only && !ipv4_is_loopback(isa.sin_addr)) { |
c5e438ec |
956 | close(t); /* someone let nonlocal through?! */ |
f7f9fb5c |
957 | } else if (plug_accepting(s->plug, t)) { |
c5e438ec |
958 | close(t); /* denied or error */ |
959 | } |
960 | break; |
961 | } |
962 | |
963 | /* |
964 | * If we reach here, this is not a listening socket, so |
965 | * readability really means readability. |
966 | */ |
967 | |
968 | /* In the case the socket is still frozen, we don't even bother */ |
969 | if (s->frozen) { |
970 | s->frozen_readable = 1; |
971 | break; |
972 | } |
973 | |
974 | /* |
975 | * We have received data on the socket. For an oobinline |
976 | * socket, this might be data _before_ an urgent pointer, |
977 | * in which case we send it to the back end with type==1 |
978 | * (data prior to urgent). |
979 | */ |
980 | if (s->oobinline && s->oobpending) { |
981 | atmark = 1; |
982 | if (ioctl(s->s, SIOCATMARK, &atmark) == 0 && atmark) |
983 | s->oobpending = FALSE; /* clear this indicator */ |
984 | } else |
985 | atmark = 1; |
986 | |
56e5b2db |
987 | ret = recv(s->s, buf, s->oobpending ? 1 : sizeof(buf), 0); |
c5e438ec |
988 | noise_ultralight(ret); |
989 | if (ret < 0) { |
990 | if (errno == EWOULDBLOCK) { |
991 | break; |
992 | } |
993 | } |
994 | if (ret < 0) { |
995 | return plug_closing(s->plug, error_string(errno), errno, 0); |
996 | } else if (0 == ret) { |
997 | return plug_closing(s->plug, NULL, 0, 0); |
998 | } else { |
999 | return plug_receive(s->plug, atmark ? 0 : 1, buf, ret); |
1000 | } |
1001 | break; |
1002 | case 2: /* writable */ |
051dd789 |
1003 | if (!s->connected) { |
1004 | /* |
1005 | * select() reports a socket as _writable_ when an |
1006 | * asynchronous connection is completed. |
1007 | */ |
1008 | s->connected = s->writable = 1; |
0ff9ea38 |
1009 | uxsel_tell(s); |
051dd789 |
1010 | break; |
1011 | } else { |
c5e438ec |
1012 | int bufsize_before, bufsize_after; |
1013 | s->writable = 1; |
1014 | bufsize_before = s->sending_oob + bufchain_size(&s->output_data); |
1015 | try_send(s); |
1016 | bufsize_after = s->sending_oob + bufchain_size(&s->output_data); |
1017 | if (bufsize_after < bufsize_before) |
1018 | plug_sent(s->plug, bufsize_after); |
1019 | } |
1020 | break; |
1021 | } |
1022 | |
1023 | return 1; |
1024 | } |
1025 | |
1026 | /* |
1027 | * Deal with socket errors detected in try_send(). |
1028 | */ |
1029 | void net_pending_errors(void) |
1030 | { |
1031 | int i; |
1032 | Actual_Socket s; |
1033 | |
1034 | /* |
1035 | * This might be a fiddly business, because it's just possible |
1036 | * that handling a pending error on one socket might cause |
1037 | * others to be closed. (I can't think of any reason this might |
1038 | * happen in current SSH implementation, but to maintain |
1039 | * generality of this network layer I'll assume the worst.) |
1040 | * |
1041 | * So what we'll do is search the socket list for _one_ socket |
1042 | * with a pending error, and then handle it, and then search |
1043 | * the list again _from the beginning_. Repeat until we make a |
1044 | * pass with no socket errors present. That way we are |
1045 | * protected against the socket list changing under our feet. |
1046 | */ |
1047 | |
1048 | do { |
1049 | for (i = 0; (s = index234(sktree, i)) != NULL; i++) { |
1050 | if (s->pending_error) { |
1051 | /* |
1052 | * An error has occurred on this socket. Pass it to the |
1053 | * plug. |
1054 | */ |
1055 | plug_closing(s->plug, error_string(s->pending_error), |
1056 | s->pending_error, 0); |
1057 | break; |
1058 | } |
1059 | } |
1060 | } while (s); |
1061 | } |
1062 | |
1063 | /* |
1064 | * Each socket abstraction contains a `void *' private field in |
1065 | * which the client can keep state. |
1066 | */ |
1067 | static void sk_tcp_set_private_ptr(Socket sock, void *ptr) |
1068 | { |
1069 | Actual_Socket s = (Actual_Socket) sock; |
1070 | s->private_ptr = ptr; |
1071 | } |
1072 | |
1073 | static void *sk_tcp_get_private_ptr(Socket sock) |
1074 | { |
1075 | Actual_Socket s = (Actual_Socket) sock; |
1076 | return s->private_ptr; |
1077 | } |
1078 | |
1079 | /* |
1080 | * Special error values are returned from sk_namelookup and sk_new |
1081 | * if there's a problem. These functions extract an error message, |
1082 | * or return NULL if there's no problem. |
1083 | */ |
cbe2d68f |
1084 | const char *sk_addr_error(SockAddr addr) |
c5e438ec |
1085 | { |
1086 | return addr->error; |
1087 | } |
cbe2d68f |
1088 | static const char *sk_tcp_socket_error(Socket sock) |
c5e438ec |
1089 | { |
1090 | Actual_Socket s = (Actual_Socket) sock; |
1091 | return s->error; |
1092 | } |
1093 | |
1094 | static void sk_tcp_set_frozen(Socket sock, int is_frozen) |
1095 | { |
1096 | Actual_Socket s = (Actual_Socket) sock; |
1097 | if (s->frozen == is_frozen) |
1098 | return; |
1099 | s->frozen = is_frozen; |
1100 | if (!is_frozen && s->frozen_readable) { |
1101 | char c; |
1102 | recv(s->s, &c, 1, MSG_PEEK); |
1103 | } |
1104 | s->frozen_readable = 0; |
0ff9ea38 |
1105 | uxsel_tell(s); |
c5e438ec |
1106 | } |
1107 | |
0ff9ea38 |
1108 | static void uxsel_tell(Actual_Socket s) |
c5e438ec |
1109 | { |
0ff9ea38 |
1110 | int rwx = 0; |
051dd789 |
1111 | if (!s->connected) |
0ff9ea38 |
1112 | rwx |= 2; /* write == connect */ |
c5e438ec |
1113 | if (s->connected && !s->frozen) |
0ff9ea38 |
1114 | rwx |= 1 | 4; /* read, except */ |
c5e438ec |
1115 | if (bufchain_size(&s->output_data)) |
0ff9ea38 |
1116 | rwx |= 2; /* write */ |
c5e438ec |
1117 | if (s->listener) |
0ff9ea38 |
1118 | rwx |= 1; /* read == accept */ |
1119 | uxsel_set(s->s, rwx, net_select_result); |
c5e438ec |
1120 | } |
1121 | |
1122 | int net_service_lookup(char *service) |
1123 | { |
1124 | struct servent *se; |
1125 | se = getservbyname(service, NULL); |
1126 | if (se != NULL) |
1127 | return ntohs(se->s_port); |
1128 | else |
1129 | return 0; |
1130 | } |
fc0f17db |
1131 | |
1132 | SockAddr platform_get_x11_unix_address(int displaynum, char **canonicalname) |
1133 | { |
1134 | SockAddr ret = snew(struct SockAddr_tag); |
1135 | int n; |
1136 | |
1137 | memset(ret, 0, sizeof *ret); |
1138 | ret->family = AF_UNIX; |
1139 | n = snprintf(ret->hostname, sizeof ret->hostname, |
1140 | "%s%d", X11_UNIX_PATH, displaynum); |
1141 | if(n < 0) |
1142 | ret->error = "snprintf failed"; |
1143 | else if(n >= sizeof ret->hostname) |
1144 | ret->error = "X11 UNIX name too long"; |
1145 | else |
1146 | *canonicalname = dupstr(ret->hostname); |
1147 | return ret; |
1148 | } |