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