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 | |
c5e438ec |
29 | struct Socket_tag { |
30 | struct socket_function_table *fn; |
31 | /* the above variable absolutely *must* be the first in this structure */ |
cbe2d68f |
32 | const char *error; |
c5e438ec |
33 | int s; |
34 | Plug plug; |
35 | void *private_ptr; |
36 | bufchain output_data; |
1cfc764f |
37 | int connected; /* irrelevant for listening sockets */ |
c5e438ec |
38 | int writable; |
39 | int frozen; /* this causes readability notifications to be ignored */ |
40 | int frozen_readable; /* this means we missed at least one readability |
41 | * notification while we were frozen */ |
42 | int localhost_only; /* for listening sockets */ |
43 | char oobdata[1]; |
44 | int sending_oob; |
45 | int oobpending; /* is there OOB data available to read? */ |
46 | int oobinline; |
47 | int pending_error; /* in case send() returns error */ |
48 | int listener; |
7555d6a5 |
49 | int nodelay, keepalive; /* for connect()-type sockets */ |
50 | int privport, port; /* and again */ |
51 | SockAddr addr; |
c5e438ec |
52 | }; |
53 | |
54 | /* |
55 | * We used to typedef struct Socket_tag *Socket. |
56 | * |
57 | * Since we have made the networking abstraction slightly more |
58 | * abstract, Socket no longer means a tcp socket (it could mean |
59 | * an ssl socket). So now we must use Actual_Socket when we know |
60 | * we are talking about a tcp socket. |
61 | */ |
62 | typedef struct Socket_tag *Actual_Socket; |
63 | |
64 | struct SockAddr_tag { |
cbe2d68f |
65 | const char *error; |
b7a189f3 |
66 | /* |
67 | * Which address family this address belongs to. AF_INET for |
68 | * IPv4; AF_INET6 for IPv6; AF_UNSPEC indicates that name |
69 | * resolution has not been done and a simple host name is held |
70 | * in this SockAddr structure. |
71 | */ |
c5e438ec |
72 | int family; |
05581745 |
73 | #ifndef NO_IPV6 |
7555d6a5 |
74 | struct addrinfo *ais; /* Addresses IPv6 style. */ |
75 | struct addrinfo *ai; /* steps along the linked list */ |
792c5eb5 |
76 | #else |
7555d6a5 |
77 | unsigned long *addresses; /* Addresses IPv4 style. */ |
78 | int naddresses, curraddr; |
c5e438ec |
79 | #endif |
b7a189f3 |
80 | char hostname[512]; /* Store an unresolved host name. */ |
c5e438ec |
81 | }; |
82 | |
83 | static tree234 *sktree; |
84 | |
0ff9ea38 |
85 | static void uxsel_tell(Actual_Socket s); |
86 | |
c5e438ec |
87 | static int cmpfortree(void *av, void *bv) |
88 | { |
89 | Actual_Socket a = (Actual_Socket) av, b = (Actual_Socket) bv; |
90 | int as = a->s, bs = b->s; |
91 | if (as < bs) |
92 | return -1; |
93 | if (as > bs) |
94 | return +1; |
95 | return 0; |
96 | } |
97 | |
98 | static int cmpforsearch(void *av, void *bv) |
99 | { |
100 | Actual_Socket b = (Actual_Socket) bv; |
f7f9fb5c |
101 | int as = *(int *)av, bs = b->s; |
c5e438ec |
102 | if (as < bs) |
103 | return -1; |
104 | if (as > bs) |
105 | return +1; |
106 | return 0; |
107 | } |
108 | |
109 | void sk_init(void) |
110 | { |
111 | sktree = newtree234(cmpfortree); |
112 | } |
113 | |
114 | void sk_cleanup(void) |
115 | { |
116 | Actual_Socket s; |
117 | int i; |
118 | |
119 | if (sktree) { |
120 | for (i = 0; (s = index234(sktree, i)) != NULL; i++) { |
121 | close(s->s); |
122 | } |
123 | } |
124 | } |
125 | |
05581745 |
126 | SockAddr sk_namelookup(const char *host, char **canonicalname, int address_family) |
c5e438ec |
127 | { |
3d88e64d |
128 | SockAddr ret = snew(struct SockAddr_tag); |
05581745 |
129 | #ifndef NO_IPV6 |
792c5eb5 |
130 | struct addrinfo hints; |
131 | int err; |
132 | #else |
c5e438ec |
133 | unsigned long a; |
134 | struct hostent *h = NULL; |
7555d6a5 |
135 | int n; |
792c5eb5 |
136 | #endif |
c5e438ec |
137 | char realhost[8192]; |
138 | |
139 | /* Clear the structure and default to IPv4. */ |
140 | memset(ret, 0, sizeof(struct SockAddr_tag)); |
141 | ret->family = 0; /* We set this one when we have resolved the host. */ |
142 | *realhost = '\0'; |
143 | ret->error = NULL; |
144 | |
05581745 |
145 | #ifndef NO_IPV6 |
792c5eb5 |
146 | hints.ai_flags = AI_CANONNAME; |
81b34354 |
147 | hints.ai_family = (address_family == ADDRTYPE_IPV4 ? AF_INET : |
148 | address_family == ADDRTYPE_IPV6 ? AF_INET6 : |
149 | AF_UNSPEC); |
150 | hints.ai_socktype = SOCK_STREAM; |
792c5eb5 |
151 | hints.ai_protocol = 0; |
152 | hints.ai_addrlen = 0; |
153 | hints.ai_addr = NULL; |
154 | hints.ai_canonname = NULL; |
155 | hints.ai_next = NULL; |
7555d6a5 |
156 | err = getaddrinfo(host, NULL, &hints, &ret->ais); |
157 | ret->ai = ret->ais; |
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 |
72e22079 |
169 | if ((a = inet_addr(host)) == (unsigned long)(in_addr_t)(-1)) { |
792c5eb5 |
170 | /* |
171 | * Otherwise use the IPv4-only gethostbyname... (NOTE: |
172 | * we don't use gethostbyname as a fallback!) |
173 | */ |
174 | if (ret->family == 0) { |
7555d6a5 |
175 | /*debug(("Resolving \"%s\" with gethostbyname() (IPv4 only)...\n", host)); */ |
176 | if ( (h = gethostbyname(host)) ) |
177 | ret->family = AF_INET; |
792c5eb5 |
178 | } |
179 | if (ret->family == 0) { |
7555d6a5 |
180 | ret->error = (h_errno == HOST_NOT_FOUND || |
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"); |
186 | return ret; |
c5e438ec |
187 | } |
792c5eb5 |
188 | /* This way we are always sure the h->h_name is valid :) */ |
189 | strncpy(realhost, h->h_name, sizeof(realhost)); |
7555d6a5 |
190 | for (n = 0; h->h_addr_list[n]; n++); |
191 | ret->addresses = snewn(n, unsigned long); |
192 | ret->naddresses = n; |
193 | for (n = 0; n < ret->naddresses; n++) { |
194 | memcpy(&a, h->h_addr_list[n], sizeof(a)); |
195 | ret->addresses[n] = ntohl(a); |
196 | } |
c5e438ec |
197 | } else { |
198 | /* |
199 | * This must be a numeric IPv4 address because it caused a |
200 | * success return from inet_addr. |
201 | */ |
202 | ret->family = AF_INET; |
203 | strncpy(realhost, host, sizeof(realhost)); |
7555d6a5 |
204 | ret->addresses = snew(unsigned long); |
205 | ret->naddresses = 1; |
206 | ret->addresses[0] = ntohl(a); |
207 | ret->curraddr = 0; |
c5e438ec |
208 | } |
792c5eb5 |
209 | #endif |
c5e438ec |
210 | realhost[lenof(realhost)-1] = '\0'; |
3d88e64d |
211 | *canonicalname = snewn(1+strlen(realhost), char); |
c5e438ec |
212 | strcpy(*canonicalname, realhost); |
213 | return ret; |
214 | } |
215 | |
e8fa8f62 |
216 | SockAddr sk_nonamelookup(const char *host) |
b7a189f3 |
217 | { |
3d88e64d |
218 | SockAddr ret = snew(struct SockAddr_tag); |
ab0873ab |
219 | ret->error = NULL; |
b7a189f3 |
220 | ret->family = AF_UNSPEC; |
221 | strncpy(ret->hostname, host, lenof(ret->hostname)); |
222 | ret->hostname[lenof(ret->hostname)-1] = '\0'; |
e14d27a1 |
223 | #ifndef NO_IPV6 |
7555d6a5 |
224 | ret->ais = NULL; |
225 | #else |
226 | ret->addresses = NULL; |
e14d27a1 |
227 | #endif |
b7a189f3 |
228 | return ret; |
229 | } |
230 | |
7555d6a5 |
231 | static int sk_nextaddr(SockAddr addr) |
232 | { |
233 | #ifndef NO_IPV6 |
234 | if (addr->ai->ai_next) { |
235 | addr->ai = addr->ai->ai_next; |
236 | addr->family = addr->ai->ai_family; |
237 | return TRUE; |
238 | } else |
239 | return FALSE; |
240 | #else |
241 | if (addr->curraddr+1 < addr->naddresses) { |
242 | addr->curraddr++; |
243 | return TRUE; |
244 | } else { |
245 | return FALSE; |
246 | } |
247 | #endif |
248 | } |
249 | |
c5e438ec |
250 | void sk_getaddr(SockAddr addr, char *buf, int buflen) |
251 | { |
792c5eb5 |
252 | |
253 | if (addr->family == AF_UNSPEC) { |
254 | strncpy(buf, addr->hostname, buflen); |
255 | buf[buflen-1] = '\0'; |
256 | } else { |
05581745 |
257 | #ifndef NO_IPV6 |
792c5eb5 |
258 | if (getnameinfo(addr->ai->ai_addr, addr->ai->ai_addrlen, buf, buflen, |
259 | NULL, 0, NI_NUMERICHOST) != 0) { |
260 | buf[0] = '\0'; |
261 | strncat(buf, "<unknown>", buflen - 1); |
262 | } |
263 | #else |
c5e438ec |
264 | struct in_addr a; |
792c5eb5 |
265 | assert(addr->family == AF_INET); |
7555d6a5 |
266 | a.s_addr = htonl(addr->addresses[addr->curraddr]); |
c5e438ec |
267 | strncpy(buf, inet_ntoa(a), buflen); |
b7a189f3 |
268 | buf[buflen-1] = '\0'; |
792c5eb5 |
269 | #endif |
c5e438ec |
270 | } |
c5e438ec |
271 | } |
272 | |
b804e1e5 |
273 | int sk_hostname_is_local(char *name) |
274 | { |
275 | return !strcmp(name, "localhost"); |
276 | } |
277 | |
147d3370 |
278 | #define ipv4_is_loopback(addr) \ |
279 | (((addr).s_addr & htonl(0xff000000)) == htonl(0x7f000000)) |
280 | |
281 | static int sockaddr_is_loopback(struct sockaddr *sa) |
282 | { |
283 | struct sockaddr_in *sin; |
284 | #ifndef NO_IPV6 |
285 | struct sockaddr_in6 *sin6; |
286 | #endif |
287 | |
288 | switch (sa->sa_family) { |
289 | case AF_INET: |
290 | sin = (struct sockaddr_in *)sa; |
291 | return ipv4_is_loopback(sin->sin_addr); |
292 | #ifndef NO_IPV6 |
293 | case AF_INET6: |
294 | sin6 = (struct sockaddr_in6 *)sa; |
295 | return IN6_IS_ADDR_LOOPBACK(&sin6->sin6_addr); |
296 | #endif |
ff677091 |
297 | case AF_UNIX: |
147d3370 |
298 | return TRUE; |
299 | default: |
300 | return FALSE; |
301 | } |
302 | } |
303 | |
b804e1e5 |
304 | int sk_address_is_local(SockAddr addr) |
305 | { |
792c5eb5 |
306 | |
307 | if (addr->family == AF_UNSPEC) |
308 | return 0; /* we don't know; assume not */ |
309 | else { |
05581745 |
310 | #ifndef NO_IPV6 |
147d3370 |
311 | return sockaddr_is_loopback(addr->ai->ai_addr); |
792c5eb5 |
312 | #else |
b804e1e5 |
313 | struct in_addr a; |
792c5eb5 |
314 | assert(addr->family == AF_INET); |
7555d6a5 |
315 | a.s_addr = htonl(addr->addresses[addr->curraddr]); |
b804e1e5 |
316 | return ipv4_is_loopback(a); |
792c5eb5 |
317 | #endif |
b804e1e5 |
318 | } |
b804e1e5 |
319 | } |
320 | |
c5e438ec |
321 | int sk_addrtype(SockAddr addr) |
322 | { |
b7a189f3 |
323 | return (addr->family == AF_INET ? ADDRTYPE_IPV4 : |
05581745 |
324 | #ifndef NO_IPV6 |
b7a189f3 |
325 | addr->family == AF_INET6 ? ADDRTYPE_IPV6 : |
326 | #endif |
327 | ADDRTYPE_NAME); |
c5e438ec |
328 | } |
329 | |
330 | void sk_addrcopy(SockAddr addr, char *buf) |
331 | { |
792c5eb5 |
332 | |
05581745 |
333 | #ifndef NO_IPV6 |
792c5eb5 |
334 | if (addr->family == AF_INET) |
335 | memcpy(buf, &((struct sockaddr_in *)addr->ai->ai_addr)->sin_addr, |
336 | sizeof(struct in_addr)); |
337 | else if (addr->family == AF_INET6) |
338 | memcpy(buf, &((struct sockaddr_in6 *)addr->ai->ai_addr)->sin6_addr, |
339 | sizeof(struct in6_addr)); |
340 | else |
341 | assert(FALSE); |
342 | #else |
343 | struct in_addr a; |
344 | |
345 | assert(addr->family == AF_INET); |
7555d6a5 |
346 | a.s_addr = htonl(addr->addresses[addr->curraddr]); |
792c5eb5 |
347 | memcpy(buf, (char*) &a.s_addr, 4); |
c5e438ec |
348 | #endif |
c5e438ec |
349 | } |
350 | |
351 | void sk_addr_free(SockAddr addr) |
352 | { |
792c5eb5 |
353 | |
05581745 |
354 | #ifndef NO_IPV6 |
7555d6a5 |
355 | if (addr->ais != NULL) |
356 | freeaddrinfo(addr->ais); |
357 | #else |
358 | sfree(addr->addresses); |
792c5eb5 |
359 | #endif |
c5e438ec |
360 | sfree(addr); |
361 | } |
362 | |
363 | static Plug sk_tcp_plug(Socket sock, Plug p) |
364 | { |
365 | Actual_Socket s = (Actual_Socket) sock; |
366 | Plug ret = s->plug; |
367 | if (p) |
368 | s->plug = p; |
369 | return ret; |
370 | } |
371 | |
372 | static void sk_tcp_flush(Socket s) |
373 | { |
374 | /* |
375 | * We send data to the socket as soon as we can anyway, |
376 | * so we don't need to do anything here. :-) |
377 | */ |
378 | } |
379 | |
380 | static void sk_tcp_close(Socket s); |
e0e7dff8 |
381 | static int sk_tcp_write(Socket s, const char *data, int len); |
382 | static int sk_tcp_write_oob(Socket s, const char *data, int len); |
c5e438ec |
383 | static void sk_tcp_set_private_ptr(Socket s, void *ptr); |
384 | static void *sk_tcp_get_private_ptr(Socket s); |
385 | static void sk_tcp_set_frozen(Socket s, int is_frozen); |
cbe2d68f |
386 | static const char *sk_tcp_socket_error(Socket s); |
c5e438ec |
387 | |
2f92b717 |
388 | static struct socket_function_table tcp_fn_table = { |
389 | sk_tcp_plug, |
390 | sk_tcp_close, |
391 | sk_tcp_write, |
392 | sk_tcp_write_oob, |
393 | sk_tcp_flush, |
394 | sk_tcp_set_private_ptr, |
395 | sk_tcp_get_private_ptr, |
396 | sk_tcp_set_frozen, |
397 | sk_tcp_socket_error |
398 | }; |
399 | |
f7f9fb5c |
400 | Socket sk_register(OSSocket sockfd, Plug plug) |
c5e438ec |
401 | { |
c5e438ec |
402 | Actual_Socket ret; |
403 | |
404 | /* |
405 | * Create Socket structure. |
406 | */ |
3d88e64d |
407 | ret = snew(struct Socket_tag); |
2f92b717 |
408 | ret->fn = &tcp_fn_table; |
c5e438ec |
409 | ret->error = NULL; |
410 | ret->plug = plug; |
411 | bufchain_init(&ret->output_data); |
412 | ret->writable = 1; /* to start with */ |
413 | ret->sending_oob = 0; |
414 | ret->frozen = 1; |
415 | ret->frozen_readable = 0; |
416 | ret->localhost_only = 0; /* unused, but best init anyway */ |
417 | ret->pending_error = 0; |
418 | ret->oobpending = FALSE; |
419 | ret->listener = 0; |
7555d6a5 |
420 | ret->addr = NULL; |
a8cb2b6e |
421 | ret->connected = 1; |
c5e438ec |
422 | |
f7f9fb5c |
423 | ret->s = sockfd; |
c5e438ec |
424 | |
425 | if (ret->s < 0) { |
7555d6a5 |
426 | ret->error = strerror(errno); |
c5e438ec |
427 | return (Socket) ret; |
428 | } |
429 | |
430 | ret->oobinline = 0; |
431 | |
0ff9ea38 |
432 | uxsel_tell(ret); |
c5e438ec |
433 | add234(sktree, ret); |
434 | |
435 | return (Socket) ret; |
436 | } |
437 | |
7555d6a5 |
438 | static int try_connect(Actual_Socket sock) |
c5e438ec |
439 | { |
c5e438ec |
440 | int s; |
05581745 |
441 | #ifndef NO_IPV6 |
c5e438ec |
442 | struct sockaddr_in6 a6; |
443 | #endif |
444 | struct sockaddr_in a; |
fc0f17db |
445 | struct sockaddr_un au; |
446 | const struct sockaddr *sa; |
7555d6a5 |
447 | int err = 0; |
c5e438ec |
448 | short localport; |
fc0f17db |
449 | int fl, salen; |
c5e438ec |
450 | |
7555d6a5 |
451 | if (sock->s >= 0) |
452 | close(sock->s); |
453 | |
454 | plug_log(sock->plug, 0, sock->addr, sock->port, NULL, 0); |
c5e438ec |
455 | |
456 | /* |
457 | * Open socket. |
458 | */ |
7555d6a5 |
459 | assert(sock->addr->family != AF_UNSPEC); |
460 | s = socket(sock->addr->family, SOCK_STREAM, 0); |
461 | sock->s = s; |
c5e438ec |
462 | |
463 | if (s < 0) { |
7555d6a5 |
464 | err = errno; |
465 | goto ret; |
c5e438ec |
466 | } |
467 | |
7555d6a5 |
468 | if (sock->oobinline) { |
c5e438ec |
469 | int b = TRUE; |
470 | setsockopt(s, SOL_SOCKET, SO_OOBINLINE, (void *) &b, sizeof(b)); |
471 | } |
472 | |
7555d6a5 |
473 | if (sock->nodelay) { |
c5e438ec |
474 | int b = TRUE; |
475 | setsockopt(s, IPPROTO_TCP, TCP_NODELAY, (void *) &b, sizeof(b)); |
476 | } |
477 | |
7555d6a5 |
478 | if (sock->keepalive) { |
79bf227b |
479 | int b = TRUE; |
480 | setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, (void *) &b, sizeof(b)); |
481 | } |
482 | |
c5e438ec |
483 | /* |
484 | * Bind to local address. |
485 | */ |
7555d6a5 |
486 | if (sock->privport) |
c5e438ec |
487 | localport = 1023; /* count from 1023 downwards */ |
488 | else |
489 | localport = 0; /* just use port 0 (ie kernel picks) */ |
490 | |
d2c29274 |
491 | /* BSD IP stacks need sockaddr_in zeroed before filling in */ |
492 | memset(&a,'\0',sizeof(struct sockaddr_in)); |
05581745 |
493 | #ifndef NO_IPV6 |
d2c29274 |
494 | memset(&a6,'\0',sizeof(struct sockaddr_in6)); |
495 | #endif |
fc0f17db |
496 | |
497 | /* We don't try to bind to a local address for UNIX domain sockets. (Why |
498 | * do we bother doing the bind when localport == 0 anyway?) */ |
7555d6a5 |
499 | if(sock->addr->family != AF_UNIX) { |
fc0f17db |
500 | /* Loop round trying to bind */ |
501 | while (1) { |
502 | int retcode; |
c5e438ec |
503 | |
05581745 |
504 | #ifndef NO_IPV6 |
7555d6a5 |
505 | if (sock->addr->family == AF_INET6) { |
fc0f17db |
506 | /* XXX use getaddrinfo to get a local address? */ |
507 | a6.sin6_family = AF_INET6; |
508 | a6.sin6_addr = in6addr_any; |
509 | a6.sin6_port = htons(localport); |
510 | retcode = bind(s, (struct sockaddr *) &a6, sizeof(a6)); |
511 | } else |
c5e438ec |
512 | #endif |
fc0f17db |
513 | { |
7555d6a5 |
514 | assert(sock->addr->family == AF_INET); |
fc0f17db |
515 | a.sin_family = AF_INET; |
516 | a.sin_addr.s_addr = htonl(INADDR_ANY); |
517 | a.sin_port = htons(localport); |
518 | retcode = bind(s, (struct sockaddr *) &a, sizeof(a)); |
519 | } |
520 | if (retcode >= 0) { |
521 | err = 0; |
522 | break; /* done */ |
523 | } else { |
524 | err = errno; |
525 | if (err != EADDRINUSE) /* failed, for a bad reason */ |
526 | break; |
527 | } |
528 | |
529 | if (localport == 0) |
530 | break; /* we're only looping once */ |
531 | localport--; |
532 | if (localport == 0) |
533 | break; /* we might have got to the end */ |
c5e438ec |
534 | } |
fc0f17db |
535 | |
7555d6a5 |
536 | if (err) |
537 | goto ret; |
c5e438ec |
538 | } |
539 | |
540 | /* |
541 | * Connect to remote address. |
542 | */ |
7555d6a5 |
543 | switch(sock->addr->family) { |
05581745 |
544 | #ifndef NO_IPV6 |
fc0f17db |
545 | case AF_INET: |
546 | /* XXX would be better to have got getaddrinfo() to fill in the port. */ |
7555d6a5 |
547 | ((struct sockaddr_in *)sock->addr->ai->ai_addr)->sin_port = |
548 | htons(sock->port); |
549 | sa = (const struct sockaddr *)sock->addr->ai->ai_addr; |
550 | salen = sock->addr->ai->ai_addrlen; |
fc0f17db |
551 | break; |
552 | case AF_INET6: |
7555d6a5 |
553 | ((struct sockaddr_in *)sock->addr->ai->ai_addr)->sin_port = |
554 | htons(sock->port); |
555 | sa = (const struct sockaddr *)sock->addr->ai->ai_addr; |
556 | salen = sock->addr->ai->ai_addrlen; |
fc0f17db |
557 | break; |
792c5eb5 |
558 | #else |
fc0f17db |
559 | case AF_INET: |
560 | a.sin_family = AF_INET; |
7555d6a5 |
561 | a.sin_addr.s_addr = htonl(sock->addr->addresses[sock->addr->curraddr]); |
562 | a.sin_port = htons((short) sock->port); |
fc0f17db |
563 | sa = (const struct sockaddr *)&a; |
564 | salen = sizeof a; |
565 | break; |
792c5eb5 |
566 | #endif |
fc0f17db |
567 | case AF_UNIX: |
7555d6a5 |
568 | assert(sock->port == 0); /* to catch confused people */ |
569 | assert(strlen(sock->addr->hostname) < sizeof au.sun_path); |
fc0f17db |
570 | memset(&au, 0, sizeof au); |
571 | au.sun_family = AF_UNIX; |
7555d6a5 |
572 | strcpy(au.sun_path, sock->addr->hostname); |
fc0f17db |
573 | sa = (const struct sockaddr *)&au; |
574 | salen = sizeof au; |
575 | break; |
576 | |
577 | default: |
578 | assert(0 && "unknown address family"); |
579 | } |
4b70e70e |
580 | |
581 | fl = fcntl(s, F_GETFL); |
582 | if (fl != -1) |
583 | fcntl(s, F_SETFL, fl | O_NONBLOCK); |
051dd789 |
584 | |
fc0f17db |
585 | if ((connect(s, sa, salen)) < 0) { |
051dd789 |
586 | if ( errno != EINPROGRESS ) { |
7555d6a5 |
587 | err = errno; |
588 | goto ret; |
c5e438ec |
589 | } |
590 | } else { |
591 | /* |
592 | * If we _don't_ get EWOULDBLOCK, the connect has completed |
593 | * and we should set the socket as connected and writable. |
594 | */ |
7555d6a5 |
595 | sock->connected = 1; |
596 | sock->writable = 1; |
c5e438ec |
597 | } |
598 | |
7555d6a5 |
599 | uxsel_tell(sock); |
600 | add234(sktree, sock); |
601 | |
602 | ret: |
603 | if (err) |
604 | plug_log(sock->plug, 1, sock->addr, sock->port, strerror(err), err); |
605 | return err; |
606 | } |
607 | |
608 | Socket sk_new(SockAddr addr, int port, int privport, int oobinline, |
609 | int nodelay, int keepalive, Plug plug) |
610 | { |
611 | Actual_Socket ret; |
612 | int err; |
613 | |
614 | /* |
615 | * Create Socket structure. |
616 | */ |
617 | ret = snew(struct Socket_tag); |
618 | ret->fn = &tcp_fn_table; |
619 | ret->error = NULL; |
620 | ret->plug = plug; |
621 | bufchain_init(&ret->output_data); |
622 | ret->connected = 0; /* to start with */ |
623 | ret->writable = 0; /* to start with */ |
624 | ret->sending_oob = 0; |
625 | ret->frozen = 0; |
626 | ret->frozen_readable = 0; |
627 | ret->localhost_only = 0; /* unused, but best init anyway */ |
628 | ret->pending_error = 0; |
629 | ret->oobpending = FALSE; |
630 | ret->listener = 0; |
631 | ret->addr = addr; |
632 | ret->s = -1; |
633 | ret->oobinline = oobinline; |
634 | ret->nodelay = nodelay; |
635 | ret->keepalive = keepalive; |
636 | ret->privport = privport; |
637 | ret->port = port; |
638 | |
639 | err = 0; |
640 | do { |
641 | err = try_connect(ret); |
642 | } while (err && sk_nextaddr(ret->addr)); |
c5e438ec |
643 | |
7555d6a5 |
644 | if (err) |
645 | ret->error = strerror(err); |
f85e6f6e |
646 | |
c5e438ec |
647 | return (Socket) ret; |
648 | } |
649 | |
05581745 |
650 | Socket sk_newlistener(char *srcaddr, int port, Plug plug, int local_host_only, int address_family) |
c5e438ec |
651 | { |
c5e438ec |
652 | int s; |
05581745 |
653 | #ifndef NO_IPV6 |
792c5eb5 |
654 | struct addrinfo hints, *ai; |
655 | char portstr[6]; |
adb18b94 |
656 | struct sockaddr_in6 a6; |
792c5eb5 |
657 | #endif |
adb18b94 |
658 | struct sockaddr *addr; |
659 | int addrlen; |
c5e438ec |
660 | struct sockaddr_in a; |
c5e438ec |
661 | Actual_Socket ret; |
662 | int retcode; |
663 | int on = 1; |
664 | |
665 | /* |
666 | * Create Socket structure. |
667 | */ |
3d88e64d |
668 | ret = snew(struct Socket_tag); |
2f92b717 |
669 | ret->fn = &tcp_fn_table; |
c5e438ec |
670 | ret->error = NULL; |
671 | ret->plug = plug; |
672 | bufchain_init(&ret->output_data); |
673 | ret->writable = 0; /* to start with */ |
674 | ret->sending_oob = 0; |
675 | ret->frozen = 0; |
676 | ret->frozen_readable = 0; |
677 | ret->localhost_only = local_host_only; |
678 | ret->pending_error = 0; |
679 | ret->oobpending = FALSE; |
680 | ret->listener = 1; |
7555d6a5 |
681 | ret->addr = NULL; |
c5e438ec |
682 | |
683 | /* |
05581745 |
684 | * Translate address_family from platform-independent constants |
685 | * into local reality. |
686 | */ |
687 | address_family = (address_family == ADDRTYPE_IPV4 ? AF_INET : |
688 | address_family == ADDRTYPE_IPV6 ? AF_INET6 : AF_UNSPEC); |
689 | |
690 | #ifndef NO_IPV6 |
691 | /* Let's default to IPv6. |
692 | * If the stack doesn't support IPv6, we will fall back to IPv4. */ |
693 | if (address_family == AF_UNSPEC) address_family = AF_INET6; |
694 | #else |
695 | /* No other choice, default to IPv4 */ |
696 | if (address_family == AF_UNSPEC) address_family = AF_INET; |
697 | #endif |
698 | |
699 | /* |
c5e438ec |
700 | * Open socket. |
701 | */ |
05581745 |
702 | s = socket(address_family, SOCK_STREAM, 0); |
703 | |
704 | /* If the host doesn't support IPv6 try fallback to IPv4. */ |
705 | if (s < 0 && address_family == AF_INET6) { |
706 | address_family = AF_INET; |
707 | s = socket(address_family, SOCK_STREAM, 0); |
708 | } |
c5e438ec |
709 | |
710 | if (s < 0) { |
7555d6a5 |
711 | ret->error = strerror(errno); |
c5e438ec |
712 | return (Socket) ret; |
713 | } |
714 | |
715 | ret->oobinline = 0; |
716 | |
717 | setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (const char *)&on, sizeof(on)); |
718 | |
adb18b94 |
719 | retcode = -1; |
720 | addr = NULL; addrlen = -1; /* placate optimiser */ |
721 | |
722 | if (srcaddr != NULL) { |
05581745 |
723 | #ifndef NO_IPV6 |
adb18b94 |
724 | hints.ai_flags = AI_NUMERICHOST; |
725 | hints.ai_family = address_family; |
d5474756 |
726 | hints.ai_socktype = SOCK_STREAM; |
adb18b94 |
727 | hints.ai_protocol = 0; |
728 | hints.ai_addrlen = 0; |
729 | hints.ai_addr = NULL; |
730 | hints.ai_canonname = NULL; |
731 | hints.ai_next = NULL; |
062af27b |
732 | assert(port >= 0 && port <= 99999); |
adb18b94 |
733 | sprintf(portstr, "%d", port); |
734 | retcode = getaddrinfo(srcaddr, portstr, &hints, &ai); |
7f8c817c |
735 | if (retcode == 0) { |
ca9892ae |
736 | addr = ai->ai_addr; |
737 | addrlen = ai->ai_addrlen; |
738 | } |
adb18b94 |
739 | #else |
740 | memset(&a,'\0',sizeof(struct sockaddr_in)); |
741 | a.sin_family = AF_INET; |
742 | a.sin_port = htons(port); |
743 | a.sin_addr.s_addr = inet_addr(srcaddr); |
744 | if (a.sin_addr.s_addr != (in_addr_t)(-1)) { |
745 | /* Override localhost_only with specified listen addr. */ |
746 | ret->localhost_only = ipv4_is_loopback(a.sin_addr); |
adb18b94 |
747 | } |
dffa03fd |
748 | addr = (struct sockaddr *)&a; |
adb18b94 |
749 | addrlen = sizeof(a); |
750 | retcode = 0; |
792c5eb5 |
751 | #endif |
adb18b94 |
752 | } |
6ee9b735 |
753 | |
adb18b94 |
754 | if (retcode != 0) { |
755 | #ifndef NO_IPV6 |
756 | if (address_family == AF_INET6) { |
757 | memset(&a6,'\0',sizeof(struct sockaddr_in6)); |
758 | a6.sin6_family = AF_INET6; |
759 | a6.sin6_port = htons(port); |
760 | if (local_host_only) |
761 | a6.sin6_addr = in6addr_loopback; |
762 | else |
763 | a6.sin6_addr = in6addr_any; |
764 | addr = (struct sockaddr *)&a6; |
765 | addrlen = sizeof(a6); |
766 | } else |
767 | #endif |
768 | { |
769 | memset(&a,'\0',sizeof(struct sockaddr_in)); |
770 | a.sin_family = AF_INET; |
771 | a.sin_port = htons(port); |
6ee9b735 |
772 | if (local_host_only) |
773 | a.sin_addr.s_addr = htonl(INADDR_LOOPBACK); |
774 | else |
775 | a.sin_addr.s_addr = htonl(INADDR_ANY); |
adb18b94 |
776 | addr = (struct sockaddr *)&a; |
777 | addrlen = sizeof(a); |
778 | } |
c5e438ec |
779 | } |
780 | |
adb18b94 |
781 | retcode = bind(s, addr, addrlen); |
782 | if (retcode < 0) { |
783 | close(s); |
7555d6a5 |
784 | ret->error = strerror(errno); |
c5e438ec |
785 | return (Socket) ret; |
786 | } |
787 | |
c5e438ec |
788 | if (listen(s, SOMAXCONN) < 0) { |
789 | close(s); |
7555d6a5 |
790 | ret->error = strerror(errno); |
c5e438ec |
791 | return (Socket) ret; |
792 | } |
793 | |
adb18b94 |
794 | ret->s = s; |
795 | |
0ff9ea38 |
796 | uxsel_tell(ret); |
c5e438ec |
797 | add234(sktree, ret); |
798 | |
799 | return (Socket) ret; |
800 | } |
801 | |
802 | static void sk_tcp_close(Socket sock) |
803 | { |
804 | Actual_Socket s = (Actual_Socket) sock; |
805 | |
0ff9ea38 |
806 | uxsel_del(s->s); |
c5e438ec |
807 | del234(sktree, s); |
808 | close(s->s); |
7555d6a5 |
809 | if (s->addr) |
810 | sk_addr_free(s->addr); |
c5e438ec |
811 | sfree(s); |
812 | } |
813 | |
0a4022a1 |
814 | void *sk_getxdmdata(void *sock, int *lenp) |
2f92b717 |
815 | { |
816 | Actual_Socket s = (Actual_Socket) sock; |
0a4022a1 |
817 | #ifdef NO_IPV6 |
2f92b717 |
818 | struct sockaddr_in addr; |
0a4022a1 |
819 | #else |
820 | struct sockaddr_storage addr; |
821 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&addr; |
822 | #endif |
823 | struct sockaddr *sa = (struct sockaddr *)&addr; |
824 | struct sockaddr_in *sin = (struct sockaddr_in *)&addr; |
2f92b717 |
825 | socklen_t addrlen; |
0a4022a1 |
826 | char *buf; |
827 | static unsigned int unix_addr = 0xFFFFFFFF; |
2f92b717 |
828 | |
829 | /* |
830 | * We must check that this socket really _is_ an Actual_Socket. |
831 | */ |
832 | if (s->fn != &tcp_fn_table) |
0a4022a1 |
833 | return NULL; /* failure */ |
2f92b717 |
834 | |
2f92b717 |
835 | addrlen = sizeof(addr); |
0a4022a1 |
836 | if (getsockname(s->s, sa, &addrlen) < 0) |
837 | return NULL; |
838 | switch(sa->sa_family) { |
fc0f17db |
839 | case AF_INET: |
0a4022a1 |
840 | *lenp = 6; |
841 | buf = snewn(*lenp, char); |
842 | PUT_32BIT_MSB_FIRST(buf, ntohl(sin->sin_addr.s_addr)); |
843 | PUT_16BIT_MSB_FIRST(buf+4, ntohs(sin->sin_port)); |
fc0f17db |
844 | break; |
0a4022a1 |
845 | #ifndef NO_IPV6 |
846 | case AF_INET6: |
847 | *lenp = 6; |
848 | buf = snewn(*lenp, char); |
849 | if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { |
850 | memcpy(buf, sin6->sin6_addr.s6_addr + 12, 4); |
851 | PUT_16BIT_MSB_FIRST(buf+4, ntohs(sin6->sin6_port)); |
852 | } else |
853 | /* This is stupid, but it's what XLib does. */ |
854 | memset(buf, 0, 6); |
855 | break; |
856 | #endif |
fc0f17db |
857 | case AF_UNIX: |
0a4022a1 |
858 | *lenp = 6; |
859 | buf = snewn(*lenp, char); |
860 | PUT_32BIT_MSB_FIRST(buf, unix_addr--); |
861 | PUT_16BIT_MSB_FIRST(buf+4, getpid()); |
fc0f17db |
862 | break; |
2f92b717 |
863 | |
fc0f17db |
864 | /* XXX IPV6 */ |
865 | |
866 | default: |
0a4022a1 |
867 | return NULL; |
fc0f17db |
868 | } |
2f92b717 |
869 | |
0a4022a1 |
870 | return buf; |
2f92b717 |
871 | } |
872 | |
c5e438ec |
873 | /* |
874 | * The function which tries to send on a socket once it's deemed |
875 | * writable. |
876 | */ |
877 | void try_send(Actual_Socket s) |
878 | { |
879 | while (s->sending_oob || bufchain_size(&s->output_data) > 0) { |
880 | int nsent; |
881 | int err; |
882 | void *data; |
883 | int len, urgentflag; |
884 | |
885 | if (s->sending_oob) { |
886 | urgentflag = MSG_OOB; |
887 | len = s->sending_oob; |
888 | data = &s->oobdata; |
889 | } else { |
890 | urgentflag = 0; |
891 | bufchain_prefix(&s->output_data, &data, &len); |
892 | } |
893 | nsent = send(s->s, data, len, urgentflag); |
894 | noise_ultralight(nsent); |
895 | if (nsent <= 0) { |
896 | err = (nsent < 0 ? errno : 0); |
897 | if (err == EWOULDBLOCK) { |
898 | /* |
899 | * Perfectly normal: we've sent all we can for the moment. |
900 | */ |
901 | s->writable = FALSE; |
902 | return; |
f3e0acda |
903 | } else { |
c5e438ec |
904 | /* |
f3e0acda |
905 | * We unfortunately can't just call plug_closing(), |
c5e438ec |
906 | * because it's quite likely that we're currently |
907 | * _in_ a call from the code we'd be calling back |
908 | * to, so we'd have to make half the SSH code |
909 | * reentrant. Instead we flag a pending error on |
910 | * the socket, to be dealt with (by calling |
911 | * plug_closing()) at some suitable future moment. |
912 | */ |
913 | s->pending_error = err; |
914 | return; |
c5e438ec |
915 | } |
916 | } else { |
917 | if (s->sending_oob) { |
918 | if (nsent < len) { |
919 | memmove(s->oobdata, s->oobdata+nsent, len-nsent); |
920 | s->sending_oob = len - nsent; |
921 | } else { |
922 | s->sending_oob = 0; |
923 | } |
924 | } else { |
925 | bufchain_consume(&s->output_data, nsent); |
926 | } |
927 | } |
928 | } |
0ff9ea38 |
929 | uxsel_tell(s); |
c5e438ec |
930 | } |
931 | |
e0e7dff8 |
932 | static int sk_tcp_write(Socket sock, const char *buf, int len) |
c5e438ec |
933 | { |
934 | Actual_Socket s = (Actual_Socket) sock; |
935 | |
936 | /* |
937 | * Add the data to the buffer list on the socket. |
938 | */ |
939 | bufchain_add(&s->output_data, buf, len); |
940 | |
941 | /* |
942 | * Now try sending from the start of the buffer list. |
943 | */ |
944 | if (s->writable) |
945 | try_send(s); |
946 | |
c2a71b0d |
947 | /* |
948 | * Update the select() status to correctly reflect whether or |
949 | * not we should be selecting for write. |
950 | */ |
951 | uxsel_tell(s); |
952 | |
c5e438ec |
953 | return bufchain_size(&s->output_data); |
954 | } |
955 | |
e0e7dff8 |
956 | static int sk_tcp_write_oob(Socket sock, const char *buf, int len) |
c5e438ec |
957 | { |
958 | Actual_Socket s = (Actual_Socket) sock; |
959 | |
960 | /* |
961 | * Replace the buffer list on the socket with the data. |
962 | */ |
963 | bufchain_clear(&s->output_data); |
964 | assert(len <= sizeof(s->oobdata)); |
965 | memcpy(s->oobdata, buf, len); |
966 | s->sending_oob = len; |
967 | |
968 | /* |
969 | * Now try sending from the start of the buffer list. |
970 | */ |
971 | if (s->writable) |
972 | try_send(s); |
973 | |
c2a71b0d |
974 | /* |
975 | * Update the select() status to correctly reflect whether or |
976 | * not we should be selecting for write. |
977 | */ |
978 | uxsel_tell(s); |
979 | |
c5e438ec |
980 | return s->sending_oob; |
981 | } |
982 | |
0ff9ea38 |
983 | static int net_select_result(int fd, int event) |
c5e438ec |
984 | { |
985 | int ret; |
c5e438ec |
986 | char buf[20480]; /* nice big buffer for plenty of speed */ |
987 | Actual_Socket s; |
988 | u_long atmark; |
989 | |
990 | /* Find the Socket structure */ |
f7f9fb5c |
991 | s = find234(sktree, &fd, cmpforsearch); |
c5e438ec |
992 | if (!s) |
993 | return 1; /* boggle */ |
994 | |
995 | noise_ultralight(event); |
996 | |
997 | switch (event) { |
c5e438ec |
998 | case 4: /* exceptional */ |
999 | if (!s->oobinline) { |
1000 | /* |
1001 | * On a non-oobinline socket, this indicates that we |
1002 | * can immediately perform an OOB read and get back OOB |
1003 | * data, which we will send to the back end with |
1004 | * type==2 (urgent data). |
1005 | */ |
1006 | ret = recv(s->s, buf, sizeof(buf), MSG_OOB); |
1007 | noise_ultralight(ret); |
1008 | if (ret <= 0) { |
f3e0acda |
1009 | return plug_closing(s->plug, |
1010 | ret == 0 ? "Internal networking trouble" : |
1011 | strerror(errno), errno, 0); |
c5e438ec |
1012 | } else { |
7555d6a5 |
1013 | /* |
1014 | * Receiving actual data on a socket means we can |
1015 | * stop falling back through the candidate |
1016 | * addresses to connect to. |
1017 | */ |
1018 | if (s->addr) { |
1019 | sk_addr_free(s->addr); |
1020 | s->addr = NULL; |
1021 | } |
c5e438ec |
1022 | return plug_receive(s->plug, 2, buf, ret); |
1023 | } |
1024 | break; |
1025 | } |
1026 | |
1027 | /* |
1028 | * If we reach here, this is an oobinline socket, which |
56e5b2db |
1029 | * means we should set s->oobpending and then deal with it |
1030 | * when we get called for the readability event (which |
1031 | * should also occur). |
c5e438ec |
1032 | */ |
1033 | s->oobpending = TRUE; |
56e5b2db |
1034 | break; |
c5e438ec |
1035 | case 1: /* readable; also acceptance */ |
1036 | if (s->listener) { |
1037 | /* |
1038 | * On a listening socket, the readability event means a |
1039 | * connection is ready to be accepted. |
1040 | */ |
19a4130c |
1041 | #ifdef NO_IPV6 |
1042 | struct sockaddr_in ss; |
1043 | #else |
1044 | struct sockaddr_storage ss; |
1045 | #endif |
1046 | socklen_t addrlen = sizeof(ss); |
c5e438ec |
1047 | int t; /* socket of connection */ |
1048 | |
19a4130c |
1049 | memset(&ss, 0, addrlen); |
1050 | t = accept(s->s, (struct sockaddr *)&ss, &addrlen); |
c5e438ec |
1051 | if (t < 0) { |
1052 | break; |
1053 | } |
1054 | |
19a4130c |
1055 | if (s->localhost_only && |
1056 | !sockaddr_is_loopback((struct sockaddr *)&ss)) { |
c5e438ec |
1057 | close(t); /* someone let nonlocal through?! */ |
f7f9fb5c |
1058 | } else if (plug_accepting(s->plug, t)) { |
c5e438ec |
1059 | close(t); /* denied or error */ |
1060 | } |
1061 | break; |
1062 | } |
1063 | |
1064 | /* |
1065 | * If we reach here, this is not a listening socket, so |
1066 | * readability really means readability. |
1067 | */ |
1068 | |
1069 | /* In the case the socket is still frozen, we don't even bother */ |
1070 | if (s->frozen) { |
1071 | s->frozen_readable = 1; |
1072 | break; |
1073 | } |
1074 | |
1075 | /* |
1076 | * We have received data on the socket. For an oobinline |
1077 | * socket, this might be data _before_ an urgent pointer, |
1078 | * in which case we send it to the back end with type==1 |
1079 | * (data prior to urgent). |
1080 | */ |
1081 | if (s->oobinline && s->oobpending) { |
1082 | atmark = 1; |
1083 | if (ioctl(s->s, SIOCATMARK, &atmark) == 0 && atmark) |
1084 | s->oobpending = FALSE; /* clear this indicator */ |
1085 | } else |
1086 | atmark = 1; |
1087 | |
56e5b2db |
1088 | ret = recv(s->s, buf, s->oobpending ? 1 : sizeof(buf), 0); |
c5e438ec |
1089 | noise_ultralight(ret); |
1090 | if (ret < 0) { |
1091 | if (errno == EWOULDBLOCK) { |
1092 | break; |
1093 | } |
1094 | } |
1095 | if (ret < 0) { |
7555d6a5 |
1096 | /* |
1097 | * An error at this point _might_ be an error reported |
1098 | * by a non-blocking connect(). So before we return a |
1099 | * panic status to the user, let's just see whether |
1100 | * that's the case. |
1101 | */ |
1102 | int err = errno; |
1103 | if (s->addr) { |
1104 | plug_log(s->plug, 1, s->addr, s->port, strerror(err), err); |
1105 | while (s->addr && sk_nextaddr(s->addr)) { |
1106 | err = try_connect(s); |
1107 | } |
1108 | } |
1109 | if (err != 0) |
1110 | return plug_closing(s->plug, strerror(err), err, 0); |
c5e438ec |
1111 | } else if (0 == ret) { |
1112 | return plug_closing(s->plug, NULL, 0, 0); |
1113 | } else { |
7555d6a5 |
1114 | /* |
1115 | * Receiving actual data on a socket means we can |
1116 | * stop falling back through the candidate |
1117 | * addresses to connect to. |
1118 | */ |
1119 | if (s->addr) { |
1120 | sk_addr_free(s->addr); |
1121 | s->addr = NULL; |
1122 | } |
c5e438ec |
1123 | return plug_receive(s->plug, atmark ? 0 : 1, buf, ret); |
1124 | } |
1125 | break; |
1126 | case 2: /* writable */ |
051dd789 |
1127 | if (!s->connected) { |
1128 | /* |
1129 | * select() reports a socket as _writable_ when an |
1130 | * asynchronous connection is completed. |
1131 | */ |
1132 | s->connected = s->writable = 1; |
0ff9ea38 |
1133 | uxsel_tell(s); |
051dd789 |
1134 | break; |
1135 | } else { |
c5e438ec |
1136 | int bufsize_before, bufsize_after; |
1137 | s->writable = 1; |
1138 | bufsize_before = s->sending_oob + bufchain_size(&s->output_data); |
1139 | try_send(s); |
1140 | bufsize_after = s->sending_oob + bufchain_size(&s->output_data); |
1141 | if (bufsize_after < bufsize_before) |
1142 | plug_sent(s->plug, bufsize_after); |
1143 | } |
1144 | break; |
1145 | } |
1146 | |
1147 | return 1; |
1148 | } |
1149 | |
1150 | /* |
1151 | * Deal with socket errors detected in try_send(). |
1152 | */ |
1153 | void net_pending_errors(void) |
1154 | { |
1155 | int i; |
1156 | Actual_Socket s; |
1157 | |
1158 | /* |
1159 | * This might be a fiddly business, because it's just possible |
1160 | * that handling a pending error on one socket might cause |
1161 | * others to be closed. (I can't think of any reason this might |
1162 | * happen in current SSH implementation, but to maintain |
1163 | * generality of this network layer I'll assume the worst.) |
1164 | * |
1165 | * So what we'll do is search the socket list for _one_ socket |
1166 | * with a pending error, and then handle it, and then search |
1167 | * the list again _from the beginning_. Repeat until we make a |
1168 | * pass with no socket errors present. That way we are |
1169 | * protected against the socket list changing under our feet. |
1170 | */ |
1171 | |
1172 | do { |
1173 | for (i = 0; (s = index234(sktree, i)) != NULL; i++) { |
1174 | if (s->pending_error) { |
1175 | /* |
1176 | * An error has occurred on this socket. Pass it to the |
1177 | * plug. |
1178 | */ |
7555d6a5 |
1179 | plug_closing(s->plug, strerror(s->pending_error), |
c5e438ec |
1180 | s->pending_error, 0); |
1181 | break; |
1182 | } |
1183 | } |
1184 | } while (s); |
1185 | } |
1186 | |
1187 | /* |
1188 | * Each socket abstraction contains a `void *' private field in |
1189 | * which the client can keep state. |
1190 | */ |
1191 | static void sk_tcp_set_private_ptr(Socket sock, void *ptr) |
1192 | { |
1193 | Actual_Socket s = (Actual_Socket) sock; |
1194 | s->private_ptr = ptr; |
1195 | } |
1196 | |
1197 | static void *sk_tcp_get_private_ptr(Socket sock) |
1198 | { |
1199 | Actual_Socket s = (Actual_Socket) sock; |
1200 | return s->private_ptr; |
1201 | } |
1202 | |
1203 | /* |
1204 | * Special error values are returned from sk_namelookup and sk_new |
1205 | * if there's a problem. These functions extract an error message, |
1206 | * or return NULL if there's no problem. |
1207 | */ |
cbe2d68f |
1208 | const char *sk_addr_error(SockAddr addr) |
c5e438ec |
1209 | { |
1210 | return addr->error; |
1211 | } |
cbe2d68f |
1212 | static const char *sk_tcp_socket_error(Socket sock) |
c5e438ec |
1213 | { |
1214 | Actual_Socket s = (Actual_Socket) sock; |
1215 | return s->error; |
1216 | } |
1217 | |
1218 | static void sk_tcp_set_frozen(Socket sock, int is_frozen) |
1219 | { |
1220 | Actual_Socket s = (Actual_Socket) sock; |
1221 | if (s->frozen == is_frozen) |
1222 | return; |
1223 | s->frozen = is_frozen; |
1224 | if (!is_frozen && s->frozen_readable) { |
1225 | char c; |
1226 | recv(s->s, &c, 1, MSG_PEEK); |
1227 | } |
1228 | s->frozen_readable = 0; |
0ff9ea38 |
1229 | uxsel_tell(s); |
c5e438ec |
1230 | } |
1231 | |
0ff9ea38 |
1232 | static void uxsel_tell(Actual_Socket s) |
c5e438ec |
1233 | { |
0ff9ea38 |
1234 | int rwx = 0; |
1cfc764f |
1235 | if (s->listener) { |
1236 | rwx |= 1; /* read == accept */ |
1237 | } else { |
1238 | if (!s->connected) |
1239 | rwx |= 2; /* write == connect */ |
1240 | if (s->connected && !s->frozen) |
1241 | rwx |= 1 | 4; /* read, except */ |
1242 | if (bufchain_size(&s->output_data)) |
1243 | rwx |= 2; /* write */ |
1244 | } |
0ff9ea38 |
1245 | uxsel_set(s->s, rwx, net_select_result); |
c5e438ec |
1246 | } |
1247 | |
1248 | int net_service_lookup(char *service) |
1249 | { |
1250 | struct servent *se; |
1251 | se = getservbyname(service, NULL); |
1252 | if (se != NULL) |
1253 | return ntohs(se->s_port); |
1254 | else |
1255 | return 0; |
1256 | } |
fc0f17db |
1257 | |
1258 | SockAddr platform_get_x11_unix_address(int displaynum, char **canonicalname) |
1259 | { |
1260 | SockAddr ret = snew(struct SockAddr_tag); |
1261 | int n; |
1262 | |
1263 | memset(ret, 0, sizeof *ret); |
1264 | ret->family = AF_UNIX; |
1265 | n = snprintf(ret->hostname, sizeof ret->hostname, |
1266 | "%s%d", X11_UNIX_PATH, displaynum); |
1267 | if(n < 0) |
1268 | ret->error = "snprintf failed"; |
1269 | else if(n >= sizeof ret->hostname) |
1270 | ret->error = "X11 UNIX name too long"; |
1271 | else |
1272 | *canonicalname = dupstr(ret->hostname); |
7555d6a5 |
1273 | #ifndef NO_IPV6 |
1274 | ret->ais = NULL; |
1275 | #else |
1276 | ret->addresses = NULL; |
1277 | #endif |
fc0f17db |
1278 | return ret; |
1279 | } |