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; |
7555d6a5 |
51 | int nodelay, keepalive; /* for connect()-type sockets */ |
52 | int privport, port; /* and again */ |
53 | SockAddr addr; |
c5e438ec |
54 | }; |
55 | |
56 | /* |
57 | * We used to typedef struct Socket_tag *Socket. |
58 | * |
59 | * Since we have made the networking abstraction slightly more |
60 | * abstract, Socket no longer means a tcp socket (it could mean |
61 | * an ssl socket). So now we must use Actual_Socket when we know |
62 | * we are talking about a tcp socket. |
63 | */ |
64 | typedef struct Socket_tag *Actual_Socket; |
65 | |
66 | struct SockAddr_tag { |
cbe2d68f |
67 | const char *error; |
b7a189f3 |
68 | /* |
69 | * Which address family this address belongs to. AF_INET for |
70 | * IPv4; AF_INET6 for IPv6; AF_UNSPEC indicates that name |
71 | * resolution has not been done and a simple host name is held |
72 | * in this SockAddr structure. |
73 | */ |
c5e438ec |
74 | int family; |
05581745 |
75 | #ifndef NO_IPV6 |
7555d6a5 |
76 | struct addrinfo *ais; /* Addresses IPv6 style. */ |
77 | struct addrinfo *ai; /* steps along the linked list */ |
792c5eb5 |
78 | #else |
7555d6a5 |
79 | unsigned long *addresses; /* Addresses IPv4 style. */ |
80 | int naddresses, curraddr; |
c5e438ec |
81 | #endif |
b7a189f3 |
82 | char hostname[512]; /* Store an unresolved host name. */ |
c5e438ec |
83 | }; |
84 | |
85 | static tree234 *sktree; |
86 | |
0ff9ea38 |
87 | static void uxsel_tell(Actual_Socket s); |
88 | |
c5e438ec |
89 | static int cmpfortree(void *av, void *bv) |
90 | { |
91 | Actual_Socket a = (Actual_Socket) av, b = (Actual_Socket) bv; |
92 | int as = a->s, bs = b->s; |
93 | if (as < bs) |
94 | return -1; |
95 | if (as > bs) |
96 | return +1; |
97 | return 0; |
98 | } |
99 | |
100 | static int cmpforsearch(void *av, void *bv) |
101 | { |
102 | Actual_Socket b = (Actual_Socket) bv; |
f7f9fb5c |
103 | int as = *(int *)av, bs = b->s; |
c5e438ec |
104 | if (as < bs) |
105 | return -1; |
106 | if (as > bs) |
107 | return +1; |
108 | return 0; |
109 | } |
110 | |
111 | void sk_init(void) |
112 | { |
113 | sktree = newtree234(cmpfortree); |
114 | } |
115 | |
116 | void sk_cleanup(void) |
117 | { |
118 | Actual_Socket s; |
119 | int i; |
120 | |
121 | if (sktree) { |
122 | for (i = 0; (s = index234(sktree, i)) != NULL; i++) { |
123 | close(s->s); |
124 | } |
125 | } |
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; |
7555d6a5 |
137 | int n; |
792c5eb5 |
138 | #endif |
c5e438ec |
139 | char realhost[8192]; |
140 | |
141 | /* Clear the structure and default to IPv4. */ |
142 | memset(ret, 0, sizeof(struct SockAddr_tag)); |
143 | ret->family = 0; /* We set this one when we have resolved the host. */ |
144 | *realhost = '\0'; |
145 | ret->error = NULL; |
146 | |
05581745 |
147 | #ifndef NO_IPV6 |
792c5eb5 |
148 | hints.ai_flags = AI_CANONNAME; |
81b34354 |
149 | hints.ai_family = (address_family == ADDRTYPE_IPV4 ? AF_INET : |
150 | address_family == ADDRTYPE_IPV6 ? AF_INET6 : |
151 | AF_UNSPEC); |
152 | hints.ai_socktype = SOCK_STREAM; |
792c5eb5 |
153 | hints.ai_protocol = 0; |
154 | hints.ai_addrlen = 0; |
155 | hints.ai_addr = NULL; |
156 | hints.ai_canonname = NULL; |
157 | hints.ai_next = NULL; |
7555d6a5 |
158 | err = getaddrinfo(host, NULL, &hints, &ret->ais); |
159 | ret->ai = ret->ais; |
792c5eb5 |
160 | if (err != 0) { |
161 | ret->error = gai_strerror(err); |
162 | return ret; |
163 | } |
164 | ret->family = ret->ai->ai_family; |
165 | *realhost = '\0'; |
166 | if (ret->ai->ai_canonname != NULL) |
167 | strncat(realhost, ret->ai->ai_canonname, sizeof(realhost) - 1); |
168 | else |
169 | strncat(realhost, host, sizeof(realhost) - 1); |
170 | #else |
72e22079 |
171 | if ((a = inet_addr(host)) == (unsigned long)(in_addr_t)(-1)) { |
792c5eb5 |
172 | /* |
173 | * Otherwise use the IPv4-only gethostbyname... (NOTE: |
174 | * we don't use gethostbyname as a fallback!) |
175 | */ |
176 | if (ret->family == 0) { |
7555d6a5 |
177 | /*debug(("Resolving \"%s\" with gethostbyname() (IPv4 only)...\n", host)); */ |
178 | if ( (h = gethostbyname(host)) ) |
179 | ret->family = AF_INET; |
792c5eb5 |
180 | } |
181 | if (ret->family == 0) { |
7555d6a5 |
182 | ret->error = (h_errno == HOST_NOT_FOUND || |
183 | h_errno == NO_DATA || |
184 | h_errno == NO_ADDRESS ? "Host does not exist" : |
185 | h_errno == TRY_AGAIN ? |
186 | "Temporary name service failure" : |
187 | "gethostbyname: unknown error"); |
188 | return ret; |
c5e438ec |
189 | } |
792c5eb5 |
190 | /* This way we are always sure the h->h_name is valid :) */ |
191 | strncpy(realhost, h->h_name, sizeof(realhost)); |
7555d6a5 |
192 | for (n = 0; h->h_addr_list[n]; n++); |
193 | ret->addresses = snewn(n, unsigned long); |
194 | ret->naddresses = n; |
195 | for (n = 0; n < ret->naddresses; n++) { |
196 | memcpy(&a, h->h_addr_list[n], sizeof(a)); |
197 | ret->addresses[n] = ntohl(a); |
198 | } |
c5e438ec |
199 | } else { |
200 | /* |
201 | * This must be a numeric IPv4 address because it caused a |
202 | * success return from inet_addr. |
203 | */ |
204 | ret->family = AF_INET; |
205 | strncpy(realhost, host, sizeof(realhost)); |
7555d6a5 |
206 | ret->addresses = snew(unsigned long); |
207 | ret->naddresses = 1; |
208 | ret->addresses[0] = ntohl(a); |
209 | ret->curraddr = 0; |
c5e438ec |
210 | } |
792c5eb5 |
211 | #endif |
c5e438ec |
212 | realhost[lenof(realhost)-1] = '\0'; |
3d88e64d |
213 | *canonicalname = snewn(1+strlen(realhost), char); |
c5e438ec |
214 | strcpy(*canonicalname, realhost); |
215 | return ret; |
216 | } |
217 | |
e8fa8f62 |
218 | SockAddr sk_nonamelookup(const char *host) |
b7a189f3 |
219 | { |
3d88e64d |
220 | SockAddr ret = snew(struct SockAddr_tag); |
ab0873ab |
221 | ret->error = NULL; |
b7a189f3 |
222 | ret->family = AF_UNSPEC; |
223 | strncpy(ret->hostname, host, lenof(ret->hostname)); |
224 | ret->hostname[lenof(ret->hostname)-1] = '\0'; |
e14d27a1 |
225 | #ifndef NO_IPV6 |
7555d6a5 |
226 | ret->ais = NULL; |
227 | #else |
228 | ret->addresses = NULL; |
e14d27a1 |
229 | #endif |
b7a189f3 |
230 | return ret; |
231 | } |
232 | |
7555d6a5 |
233 | static int sk_nextaddr(SockAddr addr) |
234 | { |
235 | #ifndef NO_IPV6 |
236 | if (addr->ai->ai_next) { |
237 | addr->ai = addr->ai->ai_next; |
238 | addr->family = addr->ai->ai_family; |
239 | return TRUE; |
240 | } else |
241 | return FALSE; |
242 | #else |
243 | if (addr->curraddr+1 < addr->naddresses) { |
244 | addr->curraddr++; |
245 | return TRUE; |
246 | } else { |
247 | return FALSE; |
248 | } |
249 | #endif |
250 | } |
251 | |
c5e438ec |
252 | void sk_getaddr(SockAddr addr, char *buf, int buflen) |
253 | { |
792c5eb5 |
254 | |
255 | if (addr->family == AF_UNSPEC) { |
256 | strncpy(buf, addr->hostname, buflen); |
257 | buf[buflen-1] = '\0'; |
258 | } else { |
05581745 |
259 | #ifndef NO_IPV6 |
792c5eb5 |
260 | if (getnameinfo(addr->ai->ai_addr, addr->ai->ai_addrlen, buf, buflen, |
261 | NULL, 0, NI_NUMERICHOST) != 0) { |
262 | buf[0] = '\0'; |
263 | strncat(buf, "<unknown>", buflen - 1); |
264 | } |
265 | #else |
c5e438ec |
266 | struct in_addr a; |
792c5eb5 |
267 | assert(addr->family == AF_INET); |
7555d6a5 |
268 | a.s_addr = htonl(addr->addresses[addr->curraddr]); |
c5e438ec |
269 | strncpy(buf, inet_ntoa(a), buflen); |
b7a189f3 |
270 | buf[buflen-1] = '\0'; |
792c5eb5 |
271 | #endif |
c5e438ec |
272 | } |
c5e438ec |
273 | } |
274 | |
b804e1e5 |
275 | int sk_hostname_is_local(char *name) |
276 | { |
277 | return !strcmp(name, "localhost"); |
278 | } |
279 | |
280 | int sk_address_is_local(SockAddr addr) |
281 | { |
792c5eb5 |
282 | |
283 | if (addr->family == AF_UNSPEC) |
284 | return 0; /* we don't know; assume not */ |
285 | else { |
05581745 |
286 | #ifndef NO_IPV6 |
792c5eb5 |
287 | if (addr->family == AF_INET) |
288 | return ipv4_is_loopback( |
289 | ((struct sockaddr_in *)addr->ai->ai_addr)->sin_addr); |
290 | else if (addr->family == AF_INET6) |
291 | return IN6_IS_ADDR_LOOPBACK( |
292 | &((struct sockaddr_in6 *)addr->ai->ai_addr)->sin6_addr); |
293 | else |
294 | return 0; |
295 | #else |
b804e1e5 |
296 | struct in_addr a; |
792c5eb5 |
297 | assert(addr->family == AF_INET); |
7555d6a5 |
298 | a.s_addr = htonl(addr->addresses[addr->curraddr]); |
b804e1e5 |
299 | return ipv4_is_loopback(a); |
792c5eb5 |
300 | #endif |
b804e1e5 |
301 | } |
b804e1e5 |
302 | } |
303 | |
c5e438ec |
304 | int sk_addrtype(SockAddr addr) |
305 | { |
b7a189f3 |
306 | return (addr->family == AF_INET ? ADDRTYPE_IPV4 : |
05581745 |
307 | #ifndef NO_IPV6 |
b7a189f3 |
308 | addr->family == AF_INET6 ? ADDRTYPE_IPV6 : |
309 | #endif |
310 | ADDRTYPE_NAME); |
c5e438ec |
311 | } |
312 | |
313 | void sk_addrcopy(SockAddr addr, char *buf) |
314 | { |
792c5eb5 |
315 | |
05581745 |
316 | #ifndef NO_IPV6 |
792c5eb5 |
317 | if (addr->family == AF_INET) |
318 | memcpy(buf, &((struct sockaddr_in *)addr->ai->ai_addr)->sin_addr, |
319 | sizeof(struct in_addr)); |
320 | else if (addr->family == AF_INET6) |
321 | memcpy(buf, &((struct sockaddr_in6 *)addr->ai->ai_addr)->sin6_addr, |
322 | sizeof(struct in6_addr)); |
323 | else |
324 | assert(FALSE); |
325 | #else |
326 | struct in_addr a; |
327 | |
328 | assert(addr->family == AF_INET); |
7555d6a5 |
329 | a.s_addr = htonl(addr->addresses[addr->curraddr]); |
792c5eb5 |
330 | memcpy(buf, (char*) &a.s_addr, 4); |
c5e438ec |
331 | #endif |
c5e438ec |
332 | } |
333 | |
334 | void sk_addr_free(SockAddr addr) |
335 | { |
792c5eb5 |
336 | |
05581745 |
337 | #ifndef NO_IPV6 |
7555d6a5 |
338 | if (addr->ais != NULL) |
339 | freeaddrinfo(addr->ais); |
340 | #else |
341 | sfree(addr->addresses); |
792c5eb5 |
342 | #endif |
c5e438ec |
343 | sfree(addr); |
344 | } |
345 | |
346 | static Plug sk_tcp_plug(Socket sock, Plug p) |
347 | { |
348 | Actual_Socket s = (Actual_Socket) sock; |
349 | Plug ret = s->plug; |
350 | if (p) |
351 | s->plug = p; |
352 | return ret; |
353 | } |
354 | |
355 | static void sk_tcp_flush(Socket s) |
356 | { |
357 | /* |
358 | * We send data to the socket as soon as we can anyway, |
359 | * so we don't need to do anything here. :-) |
360 | */ |
361 | } |
362 | |
363 | static void sk_tcp_close(Socket s); |
e0e7dff8 |
364 | static int sk_tcp_write(Socket s, const char *data, int len); |
365 | static int sk_tcp_write_oob(Socket s, const char *data, int len); |
c5e438ec |
366 | static void sk_tcp_set_private_ptr(Socket s, void *ptr); |
367 | static void *sk_tcp_get_private_ptr(Socket s); |
368 | static void sk_tcp_set_frozen(Socket s, int is_frozen); |
cbe2d68f |
369 | static const char *sk_tcp_socket_error(Socket s); |
c5e438ec |
370 | |
2f92b717 |
371 | static struct socket_function_table tcp_fn_table = { |
372 | sk_tcp_plug, |
373 | sk_tcp_close, |
374 | sk_tcp_write, |
375 | sk_tcp_write_oob, |
376 | sk_tcp_flush, |
377 | sk_tcp_set_private_ptr, |
378 | sk_tcp_get_private_ptr, |
379 | sk_tcp_set_frozen, |
380 | sk_tcp_socket_error |
381 | }; |
382 | |
f7f9fb5c |
383 | Socket sk_register(OSSocket sockfd, Plug plug) |
c5e438ec |
384 | { |
c5e438ec |
385 | Actual_Socket ret; |
386 | |
387 | /* |
388 | * Create Socket structure. |
389 | */ |
3d88e64d |
390 | ret = snew(struct Socket_tag); |
2f92b717 |
391 | ret->fn = &tcp_fn_table; |
c5e438ec |
392 | ret->error = NULL; |
393 | ret->plug = plug; |
394 | bufchain_init(&ret->output_data); |
395 | ret->writable = 1; /* to start with */ |
396 | ret->sending_oob = 0; |
397 | ret->frozen = 1; |
398 | ret->frozen_readable = 0; |
399 | ret->localhost_only = 0; /* unused, but best init anyway */ |
400 | ret->pending_error = 0; |
401 | ret->oobpending = FALSE; |
402 | ret->listener = 0; |
7555d6a5 |
403 | ret->addr = NULL; |
c5e438ec |
404 | |
f7f9fb5c |
405 | ret->s = sockfd; |
c5e438ec |
406 | |
407 | if (ret->s < 0) { |
7555d6a5 |
408 | ret->error = strerror(errno); |
c5e438ec |
409 | return (Socket) ret; |
410 | } |
411 | |
412 | ret->oobinline = 0; |
413 | |
0ff9ea38 |
414 | uxsel_tell(ret); |
c5e438ec |
415 | add234(sktree, ret); |
416 | |
417 | return (Socket) ret; |
418 | } |
419 | |
7555d6a5 |
420 | static int try_connect(Actual_Socket sock) |
c5e438ec |
421 | { |
c5e438ec |
422 | int s; |
05581745 |
423 | #ifndef NO_IPV6 |
c5e438ec |
424 | struct sockaddr_in6 a6; |
425 | #endif |
426 | struct sockaddr_in a; |
fc0f17db |
427 | struct sockaddr_un au; |
428 | const struct sockaddr *sa; |
7555d6a5 |
429 | int err = 0; |
c5e438ec |
430 | short localport; |
fc0f17db |
431 | int fl, salen; |
c5e438ec |
432 | |
7555d6a5 |
433 | if (sock->s >= 0) |
434 | close(sock->s); |
435 | |
436 | plug_log(sock->plug, 0, sock->addr, sock->port, NULL, 0); |
c5e438ec |
437 | |
438 | /* |
439 | * Open socket. |
440 | */ |
7555d6a5 |
441 | assert(sock->addr->family != AF_UNSPEC); |
442 | s = socket(sock->addr->family, SOCK_STREAM, 0); |
443 | sock->s = s; |
c5e438ec |
444 | |
445 | if (s < 0) { |
7555d6a5 |
446 | err = errno; |
447 | goto ret; |
c5e438ec |
448 | } |
449 | |
7555d6a5 |
450 | if (sock->oobinline) { |
c5e438ec |
451 | int b = TRUE; |
452 | setsockopt(s, SOL_SOCKET, SO_OOBINLINE, (void *) &b, sizeof(b)); |
453 | } |
454 | |
7555d6a5 |
455 | if (sock->nodelay) { |
c5e438ec |
456 | int b = TRUE; |
457 | setsockopt(s, IPPROTO_TCP, TCP_NODELAY, (void *) &b, sizeof(b)); |
458 | } |
459 | |
7555d6a5 |
460 | if (sock->keepalive) { |
79bf227b |
461 | int b = TRUE; |
462 | setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, (void *) &b, sizeof(b)); |
463 | } |
464 | |
c5e438ec |
465 | /* |
466 | * Bind to local address. |
467 | */ |
7555d6a5 |
468 | if (sock->privport) |
c5e438ec |
469 | localport = 1023; /* count from 1023 downwards */ |
470 | else |
471 | localport = 0; /* just use port 0 (ie kernel picks) */ |
472 | |
d2c29274 |
473 | /* BSD IP stacks need sockaddr_in zeroed before filling in */ |
474 | memset(&a,'\0',sizeof(struct sockaddr_in)); |
05581745 |
475 | #ifndef NO_IPV6 |
d2c29274 |
476 | memset(&a6,'\0',sizeof(struct sockaddr_in6)); |
477 | #endif |
fc0f17db |
478 | |
479 | /* We don't try to bind to a local address for UNIX domain sockets. (Why |
480 | * do we bother doing the bind when localport == 0 anyway?) */ |
7555d6a5 |
481 | if(sock->addr->family != AF_UNIX) { |
fc0f17db |
482 | /* Loop round trying to bind */ |
483 | while (1) { |
484 | int retcode; |
c5e438ec |
485 | |
05581745 |
486 | #ifndef NO_IPV6 |
7555d6a5 |
487 | if (sock->addr->family == AF_INET6) { |
fc0f17db |
488 | /* XXX use getaddrinfo to get a local address? */ |
489 | a6.sin6_family = AF_INET6; |
490 | a6.sin6_addr = in6addr_any; |
491 | a6.sin6_port = htons(localport); |
492 | retcode = bind(s, (struct sockaddr *) &a6, sizeof(a6)); |
493 | } else |
c5e438ec |
494 | #endif |
fc0f17db |
495 | { |
7555d6a5 |
496 | assert(sock->addr->family == AF_INET); |
fc0f17db |
497 | a.sin_family = AF_INET; |
498 | a.sin_addr.s_addr = htonl(INADDR_ANY); |
499 | a.sin_port = htons(localport); |
500 | retcode = bind(s, (struct sockaddr *) &a, sizeof(a)); |
501 | } |
502 | if (retcode >= 0) { |
503 | err = 0; |
504 | break; /* done */ |
505 | } else { |
506 | err = errno; |
507 | if (err != EADDRINUSE) /* failed, for a bad reason */ |
508 | break; |
509 | } |
510 | |
511 | if (localport == 0) |
512 | break; /* we're only looping once */ |
513 | localport--; |
514 | if (localport == 0) |
515 | break; /* we might have got to the end */ |
c5e438ec |
516 | } |
fc0f17db |
517 | |
7555d6a5 |
518 | if (err) |
519 | goto ret; |
c5e438ec |
520 | } |
521 | |
522 | /* |
523 | * Connect to remote address. |
524 | */ |
7555d6a5 |
525 | switch(sock->addr->family) { |
05581745 |
526 | #ifndef NO_IPV6 |
fc0f17db |
527 | case AF_INET: |
528 | /* XXX would be better to have got getaddrinfo() to fill in the port. */ |
7555d6a5 |
529 | ((struct sockaddr_in *)sock->addr->ai->ai_addr)->sin_port = |
530 | htons(sock->port); |
531 | sa = (const struct sockaddr *)sock->addr->ai->ai_addr; |
532 | salen = sock->addr->ai->ai_addrlen; |
fc0f17db |
533 | break; |
534 | case AF_INET6: |
7555d6a5 |
535 | ((struct sockaddr_in *)sock->addr->ai->ai_addr)->sin_port = |
536 | htons(sock->port); |
537 | sa = (const struct sockaddr *)sock->addr->ai->ai_addr; |
538 | salen = sock->addr->ai->ai_addrlen; |
fc0f17db |
539 | break; |
792c5eb5 |
540 | #else |
fc0f17db |
541 | case AF_INET: |
542 | a.sin_family = AF_INET; |
7555d6a5 |
543 | a.sin_addr.s_addr = htonl(sock->addr->addresses[sock->addr->curraddr]); |
544 | a.sin_port = htons((short) sock->port); |
fc0f17db |
545 | sa = (const struct sockaddr *)&a; |
546 | salen = sizeof a; |
547 | break; |
792c5eb5 |
548 | #endif |
fc0f17db |
549 | case AF_UNIX: |
7555d6a5 |
550 | assert(sock->port == 0); /* to catch confused people */ |
551 | assert(strlen(sock->addr->hostname) < sizeof au.sun_path); |
fc0f17db |
552 | memset(&au, 0, sizeof au); |
553 | au.sun_family = AF_UNIX; |
7555d6a5 |
554 | strcpy(au.sun_path, sock->addr->hostname); |
fc0f17db |
555 | sa = (const struct sockaddr *)&au; |
556 | salen = sizeof au; |
557 | break; |
558 | |
559 | default: |
560 | assert(0 && "unknown address family"); |
561 | } |
4b70e70e |
562 | |
563 | fl = fcntl(s, F_GETFL); |
564 | if (fl != -1) |
565 | fcntl(s, F_SETFL, fl | O_NONBLOCK); |
051dd789 |
566 | |
fc0f17db |
567 | if ((connect(s, sa, salen)) < 0) { |
051dd789 |
568 | if ( errno != EINPROGRESS ) { |
7555d6a5 |
569 | err = errno; |
570 | goto ret; |
c5e438ec |
571 | } |
572 | } else { |
573 | /* |
574 | * If we _don't_ get EWOULDBLOCK, the connect has completed |
575 | * and we should set the socket as connected and writable. |
576 | */ |
7555d6a5 |
577 | sock->connected = 1; |
578 | sock->writable = 1; |
c5e438ec |
579 | } |
580 | |
7555d6a5 |
581 | uxsel_tell(sock); |
582 | add234(sktree, sock); |
583 | |
584 | ret: |
585 | if (err) |
586 | plug_log(sock->plug, 1, sock->addr, sock->port, strerror(err), err); |
587 | return err; |
588 | } |
589 | |
590 | Socket sk_new(SockAddr addr, int port, int privport, int oobinline, |
591 | int nodelay, int keepalive, Plug plug) |
592 | { |
593 | Actual_Socket ret; |
594 | int err; |
595 | |
596 | /* |
597 | * Create Socket structure. |
598 | */ |
599 | ret = snew(struct Socket_tag); |
600 | ret->fn = &tcp_fn_table; |
601 | ret->error = NULL; |
602 | ret->plug = plug; |
603 | bufchain_init(&ret->output_data); |
604 | ret->connected = 0; /* to start with */ |
605 | ret->writable = 0; /* to start with */ |
606 | ret->sending_oob = 0; |
607 | ret->frozen = 0; |
608 | ret->frozen_readable = 0; |
609 | ret->localhost_only = 0; /* unused, but best init anyway */ |
610 | ret->pending_error = 0; |
611 | ret->oobpending = FALSE; |
612 | ret->listener = 0; |
613 | ret->addr = addr; |
614 | ret->s = -1; |
615 | ret->oobinline = oobinline; |
616 | ret->nodelay = nodelay; |
617 | ret->keepalive = keepalive; |
618 | ret->privport = privport; |
619 | ret->port = port; |
620 | |
621 | err = 0; |
622 | do { |
623 | err = try_connect(ret); |
624 | } while (err && sk_nextaddr(ret->addr)); |
c5e438ec |
625 | |
7555d6a5 |
626 | if (err) |
627 | ret->error = strerror(err); |
f85e6f6e |
628 | |
c5e438ec |
629 | return (Socket) ret; |
630 | } |
631 | |
05581745 |
632 | Socket sk_newlistener(char *srcaddr, int port, Plug plug, int local_host_only, int address_family) |
c5e438ec |
633 | { |
c5e438ec |
634 | int s; |
05581745 |
635 | #ifndef NO_IPV6 |
792c5eb5 |
636 | struct addrinfo hints, *ai; |
637 | char portstr[6]; |
adb18b94 |
638 | struct sockaddr_in6 a6; |
792c5eb5 |
639 | #endif |
adb18b94 |
640 | struct sockaddr *addr; |
641 | int addrlen; |
c5e438ec |
642 | struct sockaddr_in a; |
c5e438ec |
643 | Actual_Socket ret; |
644 | int retcode; |
645 | int on = 1; |
646 | |
647 | /* |
648 | * Create Socket structure. |
649 | */ |
3d88e64d |
650 | ret = snew(struct Socket_tag); |
2f92b717 |
651 | ret->fn = &tcp_fn_table; |
c5e438ec |
652 | ret->error = NULL; |
653 | ret->plug = plug; |
654 | bufchain_init(&ret->output_data); |
655 | ret->writable = 0; /* to start with */ |
656 | ret->sending_oob = 0; |
657 | ret->frozen = 0; |
658 | ret->frozen_readable = 0; |
659 | ret->localhost_only = local_host_only; |
660 | ret->pending_error = 0; |
661 | ret->oobpending = FALSE; |
662 | ret->listener = 1; |
7555d6a5 |
663 | ret->addr = NULL; |
c5e438ec |
664 | |
665 | /* |
05581745 |
666 | * Translate address_family from platform-independent constants |
667 | * into local reality. |
668 | */ |
669 | address_family = (address_family == ADDRTYPE_IPV4 ? AF_INET : |
670 | address_family == ADDRTYPE_IPV6 ? AF_INET6 : AF_UNSPEC); |
671 | |
672 | #ifndef NO_IPV6 |
673 | /* Let's default to IPv6. |
674 | * If the stack doesn't support IPv6, we will fall back to IPv4. */ |
675 | if (address_family == AF_UNSPEC) address_family = AF_INET6; |
676 | #else |
677 | /* No other choice, default to IPv4 */ |
678 | if (address_family == AF_UNSPEC) address_family = AF_INET; |
679 | #endif |
680 | |
681 | /* |
c5e438ec |
682 | * Open socket. |
683 | */ |
05581745 |
684 | s = socket(address_family, SOCK_STREAM, 0); |
685 | |
686 | /* If the host doesn't support IPv6 try fallback to IPv4. */ |
687 | if (s < 0 && address_family == AF_INET6) { |
688 | address_family = AF_INET; |
689 | s = socket(address_family, SOCK_STREAM, 0); |
690 | } |
c5e438ec |
691 | |
692 | if (s < 0) { |
7555d6a5 |
693 | ret->error = strerror(errno); |
c5e438ec |
694 | return (Socket) ret; |
695 | } |
696 | |
697 | ret->oobinline = 0; |
698 | |
699 | setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (const char *)&on, sizeof(on)); |
700 | |
adb18b94 |
701 | retcode = -1; |
702 | addr = NULL; addrlen = -1; /* placate optimiser */ |
703 | |
704 | if (srcaddr != NULL) { |
05581745 |
705 | #ifndef NO_IPV6 |
adb18b94 |
706 | hints.ai_flags = AI_NUMERICHOST; |
707 | hints.ai_family = address_family; |
708 | hints.ai_socktype = 0; |
709 | hints.ai_protocol = 0; |
710 | hints.ai_addrlen = 0; |
711 | hints.ai_addr = NULL; |
712 | hints.ai_canonname = NULL; |
713 | hints.ai_next = NULL; |
714 | sprintf(portstr, "%d", port); |
715 | retcode = getaddrinfo(srcaddr, portstr, &hints, &ai); |
716 | addr = ai->ai_addr; |
717 | addrlen = ai->ai_addrlen; |
718 | #else |
719 | memset(&a,'\0',sizeof(struct sockaddr_in)); |
720 | a.sin_family = AF_INET; |
721 | a.sin_port = htons(port); |
722 | a.sin_addr.s_addr = inet_addr(srcaddr); |
723 | if (a.sin_addr.s_addr != (in_addr_t)(-1)) { |
724 | /* Override localhost_only with specified listen addr. */ |
725 | ret->localhost_only = ipv4_is_loopback(a.sin_addr); |
726 | got_addr = 1; |
727 | } |
728 | addr = (struct sockaddr *)a; |
729 | addrlen = sizeof(a); |
730 | retcode = 0; |
792c5eb5 |
731 | #endif |
adb18b94 |
732 | } |
6ee9b735 |
733 | |
adb18b94 |
734 | if (retcode != 0) { |
735 | #ifndef NO_IPV6 |
736 | if (address_family == AF_INET6) { |
737 | memset(&a6,'\0',sizeof(struct sockaddr_in6)); |
738 | a6.sin6_family = AF_INET6; |
739 | a6.sin6_port = htons(port); |
740 | if (local_host_only) |
741 | a6.sin6_addr = in6addr_loopback; |
742 | else |
743 | a6.sin6_addr = in6addr_any; |
744 | addr = (struct sockaddr *)&a6; |
745 | addrlen = sizeof(a6); |
746 | } else |
747 | #endif |
748 | { |
749 | memset(&a,'\0',sizeof(struct sockaddr_in)); |
750 | a.sin_family = AF_INET; |
751 | a.sin_port = htons(port); |
6ee9b735 |
752 | if (local_host_only) |
753 | a.sin_addr.s_addr = htonl(INADDR_LOOPBACK); |
754 | else |
755 | a.sin_addr.s_addr = htonl(INADDR_ANY); |
adb18b94 |
756 | addr = (struct sockaddr *)&a; |
757 | addrlen = sizeof(a); |
758 | } |
c5e438ec |
759 | } |
760 | |
adb18b94 |
761 | retcode = bind(s, addr, addrlen); |
762 | if (retcode < 0) { |
763 | close(s); |
7555d6a5 |
764 | ret->error = strerror(errno); |
c5e438ec |
765 | return (Socket) ret; |
766 | } |
767 | |
c5e438ec |
768 | if (listen(s, SOMAXCONN) < 0) { |
769 | close(s); |
7555d6a5 |
770 | ret->error = strerror(errno); |
c5e438ec |
771 | return (Socket) ret; |
772 | } |
773 | |
adb18b94 |
774 | ret->s = s; |
775 | |
0ff9ea38 |
776 | uxsel_tell(ret); |
c5e438ec |
777 | add234(sktree, ret); |
778 | |
779 | return (Socket) ret; |
780 | } |
781 | |
782 | static void sk_tcp_close(Socket sock) |
783 | { |
784 | Actual_Socket s = (Actual_Socket) sock; |
785 | |
0ff9ea38 |
786 | uxsel_del(s->s); |
c5e438ec |
787 | del234(sktree, s); |
788 | close(s->s); |
7555d6a5 |
789 | if (s->addr) |
790 | sk_addr_free(s->addr); |
c5e438ec |
791 | sfree(s); |
792 | } |
793 | |
2f92b717 |
794 | int sk_getxdmdata(void *sock, unsigned long *ip, int *port) |
795 | { |
796 | Actual_Socket s = (Actual_Socket) sock; |
797 | struct sockaddr_in addr; |
798 | socklen_t addrlen; |
799 | |
800 | /* |
801 | * We must check that this socket really _is_ an Actual_Socket. |
802 | */ |
803 | if (s->fn != &tcp_fn_table) |
804 | return 0; /* failure */ |
805 | |
2f92b717 |
806 | addrlen = sizeof(addr); |
fc0f17db |
807 | if (getsockname(s->s, (struct sockaddr *)&addr, &addrlen) < 0) |
2f92b717 |
808 | return 0; |
fc0f17db |
809 | switch(addr.sin_family) { |
810 | case AF_INET: |
811 | *ip = ntohl(addr.sin_addr.s_addr); |
812 | *port = ntohs(addr.sin_port); |
813 | break; |
814 | case AF_UNIX: |
815 | /* |
816 | * For a Unix socket, we return 0xFFFFFFFF for the IP address and |
817 | * our current pid for the port. Bizarre, but such is life. |
818 | */ |
819 | *ip = ntohl(0xFFFFFFFF); |
820 | *port = getpid(); |
821 | break; |
2f92b717 |
822 | |
fc0f17db |
823 | /* XXX IPV6 */ |
824 | |
825 | default: |
826 | return 0; |
827 | } |
2f92b717 |
828 | |
829 | return 1; |
830 | } |
831 | |
c5e438ec |
832 | /* |
833 | * The function which tries to send on a socket once it's deemed |
834 | * writable. |
835 | */ |
836 | void try_send(Actual_Socket s) |
837 | { |
838 | while (s->sending_oob || bufchain_size(&s->output_data) > 0) { |
839 | int nsent; |
840 | int err; |
841 | void *data; |
842 | int len, urgentflag; |
843 | |
844 | if (s->sending_oob) { |
845 | urgentflag = MSG_OOB; |
846 | len = s->sending_oob; |
847 | data = &s->oobdata; |
848 | } else { |
849 | urgentflag = 0; |
850 | bufchain_prefix(&s->output_data, &data, &len); |
851 | } |
852 | nsent = send(s->s, data, len, urgentflag); |
853 | noise_ultralight(nsent); |
854 | if (nsent <= 0) { |
855 | err = (nsent < 0 ? errno : 0); |
856 | if (err == EWOULDBLOCK) { |
857 | /* |
858 | * Perfectly normal: we've sent all we can for the moment. |
859 | */ |
860 | s->writable = FALSE; |
861 | return; |
862 | } else if (nsent == 0 || |
863 | err == ECONNABORTED || err == ECONNRESET) { |
864 | /* |
865 | * If send() returns CONNABORTED or CONNRESET, we |
866 | * unfortunately can't just call plug_closing(), |
867 | * because it's quite likely that we're currently |
868 | * _in_ a call from the code we'd be calling back |
869 | * to, so we'd have to make half the SSH code |
870 | * reentrant. Instead we flag a pending error on |
871 | * the socket, to be dealt with (by calling |
872 | * plug_closing()) at some suitable future moment. |
873 | */ |
874 | s->pending_error = err; |
875 | return; |
876 | } else { |
877 | /* We're inside the Unix frontend here, so we know |
878 | * that the frontend handle is unnecessary. */ |
7555d6a5 |
879 | logevent(NULL, strerror(err)); |
880 | fatalbox("%s", strerror(err)); |
c5e438ec |
881 | } |
882 | } else { |
883 | if (s->sending_oob) { |
884 | if (nsent < len) { |
885 | memmove(s->oobdata, s->oobdata+nsent, len-nsent); |
886 | s->sending_oob = len - nsent; |
887 | } else { |
888 | s->sending_oob = 0; |
889 | } |
890 | } else { |
891 | bufchain_consume(&s->output_data, nsent); |
892 | } |
893 | } |
894 | } |
0ff9ea38 |
895 | uxsel_tell(s); |
c5e438ec |
896 | } |
897 | |
e0e7dff8 |
898 | static int sk_tcp_write(Socket sock, const char *buf, int len) |
c5e438ec |
899 | { |
900 | Actual_Socket s = (Actual_Socket) sock; |
901 | |
902 | /* |
903 | * Add the data to the buffer list on the socket. |
904 | */ |
905 | bufchain_add(&s->output_data, buf, len); |
906 | |
907 | /* |
908 | * Now try sending from the start of the buffer list. |
909 | */ |
910 | if (s->writable) |
911 | try_send(s); |
912 | |
c2a71b0d |
913 | /* |
914 | * Update the select() status to correctly reflect whether or |
915 | * not we should be selecting for write. |
916 | */ |
917 | uxsel_tell(s); |
918 | |
c5e438ec |
919 | return bufchain_size(&s->output_data); |
920 | } |
921 | |
e0e7dff8 |
922 | static int sk_tcp_write_oob(Socket sock, const char *buf, int len) |
c5e438ec |
923 | { |
924 | Actual_Socket s = (Actual_Socket) sock; |
925 | |
926 | /* |
927 | * Replace the buffer list on the socket with the data. |
928 | */ |
929 | bufchain_clear(&s->output_data); |
930 | assert(len <= sizeof(s->oobdata)); |
931 | memcpy(s->oobdata, buf, len); |
932 | s->sending_oob = len; |
933 | |
934 | /* |
935 | * Now try sending from the start of the buffer list. |
936 | */ |
937 | if (s->writable) |
938 | try_send(s); |
939 | |
c2a71b0d |
940 | /* |
941 | * Update the select() status to correctly reflect whether or |
942 | * not we should be selecting for write. |
943 | */ |
944 | uxsel_tell(s); |
945 | |
c5e438ec |
946 | return s->sending_oob; |
947 | } |
948 | |
0ff9ea38 |
949 | static int net_select_result(int fd, int event) |
c5e438ec |
950 | { |
951 | int ret; |
952 | int err; |
953 | char buf[20480]; /* nice big buffer for plenty of speed */ |
954 | Actual_Socket s; |
955 | u_long atmark; |
956 | |
957 | /* Find the Socket structure */ |
f7f9fb5c |
958 | s = find234(sktree, &fd, cmpforsearch); |
c5e438ec |
959 | if (!s) |
960 | return 1; /* boggle */ |
961 | |
962 | noise_ultralight(event); |
963 | |
964 | switch (event) { |
c5e438ec |
965 | case 4: /* exceptional */ |
966 | if (!s->oobinline) { |
967 | /* |
968 | * On a non-oobinline socket, this indicates that we |
969 | * can immediately perform an OOB read and get back OOB |
970 | * data, which we will send to the back end with |
971 | * type==2 (urgent data). |
972 | */ |
973 | ret = recv(s->s, buf, sizeof(buf), MSG_OOB); |
974 | noise_ultralight(ret); |
975 | if (ret <= 0) { |
cbe2d68f |
976 | const char *str = (ret == 0 ? "Internal networking trouble" : |
7555d6a5 |
977 | strerror(errno)); |
c5e438ec |
978 | /* We're inside the Unix frontend here, so we know |
979 | * that the frontend handle is unnecessary. */ |
980 | logevent(NULL, str); |
981 | fatalbox("%s", str); |
982 | } else { |
7555d6a5 |
983 | /* |
984 | * Receiving actual data on a socket means we can |
985 | * stop falling back through the candidate |
986 | * addresses to connect to. |
987 | */ |
988 | if (s->addr) { |
989 | sk_addr_free(s->addr); |
990 | s->addr = NULL; |
991 | } |
c5e438ec |
992 | return plug_receive(s->plug, 2, buf, ret); |
993 | } |
994 | break; |
995 | } |
996 | |
997 | /* |
998 | * If we reach here, this is an oobinline socket, which |
56e5b2db |
999 | * means we should set s->oobpending and then deal with it |
1000 | * when we get called for the readability event (which |
1001 | * should also occur). |
c5e438ec |
1002 | */ |
1003 | s->oobpending = TRUE; |
56e5b2db |
1004 | break; |
c5e438ec |
1005 | case 1: /* readable; also acceptance */ |
1006 | if (s->listener) { |
1007 | /* |
1008 | * On a listening socket, the readability event means a |
1009 | * connection is ready to be accepted. |
1010 | */ |
1011 | struct sockaddr_in isa; |
1012 | int addrlen = sizeof(struct sockaddr_in); |
1013 | int t; /* socket of connection */ |
1014 | |
1015 | memset(&isa, 0, sizeof(struct sockaddr_in)); |
1016 | err = 0; |
776792d7 |
1017 | t = accept(s->s,(struct sockaddr *)&isa,(socklen_t *) &addrlen); |
c5e438ec |
1018 | if (t < 0) { |
1019 | break; |
1020 | } |
1021 | |
6ee9b735 |
1022 | if (s->localhost_only && !ipv4_is_loopback(isa.sin_addr)) { |
c5e438ec |
1023 | close(t); /* someone let nonlocal through?! */ |
f7f9fb5c |
1024 | } else if (plug_accepting(s->plug, t)) { |
c5e438ec |
1025 | close(t); /* denied or error */ |
1026 | } |
1027 | break; |
1028 | } |
1029 | |
1030 | /* |
1031 | * If we reach here, this is not a listening socket, so |
1032 | * readability really means readability. |
1033 | */ |
1034 | |
1035 | /* In the case the socket is still frozen, we don't even bother */ |
1036 | if (s->frozen) { |
1037 | s->frozen_readable = 1; |
1038 | break; |
1039 | } |
1040 | |
1041 | /* |
1042 | * We have received data on the socket. For an oobinline |
1043 | * socket, this might be data _before_ an urgent pointer, |
1044 | * in which case we send it to the back end with type==1 |
1045 | * (data prior to urgent). |
1046 | */ |
1047 | if (s->oobinline && s->oobpending) { |
1048 | atmark = 1; |
1049 | if (ioctl(s->s, SIOCATMARK, &atmark) == 0 && atmark) |
1050 | s->oobpending = FALSE; /* clear this indicator */ |
1051 | } else |
1052 | atmark = 1; |
1053 | |
56e5b2db |
1054 | ret = recv(s->s, buf, s->oobpending ? 1 : sizeof(buf), 0); |
c5e438ec |
1055 | noise_ultralight(ret); |
1056 | if (ret < 0) { |
1057 | if (errno == EWOULDBLOCK) { |
1058 | break; |
1059 | } |
1060 | } |
1061 | if (ret < 0) { |
7555d6a5 |
1062 | /* |
1063 | * An error at this point _might_ be an error reported |
1064 | * by a non-blocking connect(). So before we return a |
1065 | * panic status to the user, let's just see whether |
1066 | * that's the case. |
1067 | */ |
1068 | int err = errno; |
1069 | if (s->addr) { |
1070 | plug_log(s->plug, 1, s->addr, s->port, strerror(err), err); |
1071 | while (s->addr && sk_nextaddr(s->addr)) { |
1072 | err = try_connect(s); |
1073 | } |
1074 | } |
1075 | if (err != 0) |
1076 | return plug_closing(s->plug, strerror(err), err, 0); |
c5e438ec |
1077 | } else if (0 == ret) { |
1078 | return plug_closing(s->plug, NULL, 0, 0); |
1079 | } else { |
7555d6a5 |
1080 | /* |
1081 | * Receiving actual data on a socket means we can |
1082 | * stop falling back through the candidate |
1083 | * addresses to connect to. |
1084 | */ |
1085 | if (s->addr) { |
1086 | sk_addr_free(s->addr); |
1087 | s->addr = NULL; |
1088 | } |
c5e438ec |
1089 | return plug_receive(s->plug, atmark ? 0 : 1, buf, ret); |
1090 | } |
1091 | break; |
1092 | case 2: /* writable */ |
051dd789 |
1093 | if (!s->connected) { |
1094 | /* |
1095 | * select() reports a socket as _writable_ when an |
1096 | * asynchronous connection is completed. |
1097 | */ |
1098 | s->connected = s->writable = 1; |
0ff9ea38 |
1099 | uxsel_tell(s); |
051dd789 |
1100 | break; |
1101 | } else { |
c5e438ec |
1102 | int bufsize_before, bufsize_after; |
1103 | s->writable = 1; |
1104 | bufsize_before = s->sending_oob + bufchain_size(&s->output_data); |
1105 | try_send(s); |
1106 | bufsize_after = s->sending_oob + bufchain_size(&s->output_data); |
1107 | if (bufsize_after < bufsize_before) |
1108 | plug_sent(s->plug, bufsize_after); |
1109 | } |
1110 | break; |
1111 | } |
1112 | |
1113 | return 1; |
1114 | } |
1115 | |
1116 | /* |
1117 | * Deal with socket errors detected in try_send(). |
1118 | */ |
1119 | void net_pending_errors(void) |
1120 | { |
1121 | int i; |
1122 | Actual_Socket s; |
1123 | |
1124 | /* |
1125 | * This might be a fiddly business, because it's just possible |
1126 | * that handling a pending error on one socket might cause |
1127 | * others to be closed. (I can't think of any reason this might |
1128 | * happen in current SSH implementation, but to maintain |
1129 | * generality of this network layer I'll assume the worst.) |
1130 | * |
1131 | * So what we'll do is search the socket list for _one_ socket |
1132 | * with a pending error, and then handle it, and then search |
1133 | * the list again _from the beginning_. Repeat until we make a |
1134 | * pass with no socket errors present. That way we are |
1135 | * protected against the socket list changing under our feet. |
1136 | */ |
1137 | |
1138 | do { |
1139 | for (i = 0; (s = index234(sktree, i)) != NULL; i++) { |
1140 | if (s->pending_error) { |
1141 | /* |
1142 | * An error has occurred on this socket. Pass it to the |
1143 | * plug. |
1144 | */ |
7555d6a5 |
1145 | plug_closing(s->plug, strerror(s->pending_error), |
c5e438ec |
1146 | s->pending_error, 0); |
1147 | break; |
1148 | } |
1149 | } |
1150 | } while (s); |
1151 | } |
1152 | |
1153 | /* |
1154 | * Each socket abstraction contains a `void *' private field in |
1155 | * which the client can keep state. |
1156 | */ |
1157 | static void sk_tcp_set_private_ptr(Socket sock, void *ptr) |
1158 | { |
1159 | Actual_Socket s = (Actual_Socket) sock; |
1160 | s->private_ptr = ptr; |
1161 | } |
1162 | |
1163 | static void *sk_tcp_get_private_ptr(Socket sock) |
1164 | { |
1165 | Actual_Socket s = (Actual_Socket) sock; |
1166 | return s->private_ptr; |
1167 | } |
1168 | |
1169 | /* |
1170 | * Special error values are returned from sk_namelookup and sk_new |
1171 | * if there's a problem. These functions extract an error message, |
1172 | * or return NULL if there's no problem. |
1173 | */ |
cbe2d68f |
1174 | const char *sk_addr_error(SockAddr addr) |
c5e438ec |
1175 | { |
1176 | return addr->error; |
1177 | } |
cbe2d68f |
1178 | static const char *sk_tcp_socket_error(Socket sock) |
c5e438ec |
1179 | { |
1180 | Actual_Socket s = (Actual_Socket) sock; |
1181 | return s->error; |
1182 | } |
1183 | |
1184 | static void sk_tcp_set_frozen(Socket sock, int is_frozen) |
1185 | { |
1186 | Actual_Socket s = (Actual_Socket) sock; |
1187 | if (s->frozen == is_frozen) |
1188 | return; |
1189 | s->frozen = is_frozen; |
1190 | if (!is_frozen && s->frozen_readable) { |
1191 | char c; |
1192 | recv(s->s, &c, 1, MSG_PEEK); |
1193 | } |
1194 | s->frozen_readable = 0; |
0ff9ea38 |
1195 | uxsel_tell(s); |
c5e438ec |
1196 | } |
1197 | |
0ff9ea38 |
1198 | static void uxsel_tell(Actual_Socket s) |
c5e438ec |
1199 | { |
0ff9ea38 |
1200 | int rwx = 0; |
051dd789 |
1201 | if (!s->connected) |
0ff9ea38 |
1202 | rwx |= 2; /* write == connect */ |
c5e438ec |
1203 | if (s->connected && !s->frozen) |
0ff9ea38 |
1204 | rwx |= 1 | 4; /* read, except */ |
c5e438ec |
1205 | if (bufchain_size(&s->output_data)) |
0ff9ea38 |
1206 | rwx |= 2; /* write */ |
c5e438ec |
1207 | if (s->listener) |
0ff9ea38 |
1208 | rwx |= 1; /* read == accept */ |
1209 | uxsel_set(s->s, rwx, net_select_result); |
c5e438ec |
1210 | } |
1211 | |
1212 | int net_service_lookup(char *service) |
1213 | { |
1214 | struct servent *se; |
1215 | se = getservbyname(service, NULL); |
1216 | if (se != NULL) |
1217 | return ntohs(se->s_port); |
1218 | else |
1219 | return 0; |
1220 | } |
fc0f17db |
1221 | |
1222 | SockAddr platform_get_x11_unix_address(int displaynum, char **canonicalname) |
1223 | { |
1224 | SockAddr ret = snew(struct SockAddr_tag); |
1225 | int n; |
1226 | |
1227 | memset(ret, 0, sizeof *ret); |
1228 | ret->family = AF_UNIX; |
1229 | n = snprintf(ret->hostname, sizeof ret->hostname, |
1230 | "%s%d", X11_UNIX_PATH, displaynum); |
1231 | if(n < 0) |
1232 | ret->error = "snprintf failed"; |
1233 | else if(n >= sizeof ret->hostname) |
1234 | ret->error = "X11 UNIX name too long"; |
1235 | else |
1236 | *canonicalname = dupstr(ret->hostname); |
7555d6a5 |
1237 | #ifndef NO_IPV6 |
1238 | ret->ais = NULL; |
1239 | #else |
1240 | ret->addresses = NULL; |
1241 | #endif |
fc0f17db |
1242 | return ret; |
1243 | } |