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1c1af145 | 1 | /* |
2 | * Unix networking abstraction. | |
3 | */ | |
4 | ||
5 | #include <stdio.h> | |
6 | #include <stdlib.h> | |
7 | #include <assert.h> | |
8 | #include <errno.h> | |
9 | #include <fcntl.h> | |
10 | #include <unistd.h> | |
11 | #include <sys/types.h> | |
12 | #include <sys/socket.h> | |
13 | #include <sys/ioctl.h> | |
14 | #include <arpa/inet.h> | |
15 | #include <netinet/in.h> | |
16 | #include <netinet/tcp.h> | |
17 | #include <netdb.h> | |
18 | #include <sys/un.h> | |
19 | ||
20 | #define DEFINE_PLUG_METHOD_MACROS | |
21 | #include "putty.h" | |
22 | #include "network.h" | |
23 | #include "tree234.h" | |
24 | ||
25 | /* Solaris needs <sys/sockio.h> for SIOCATMARK. */ | |
26 | #ifndef SIOCATMARK | |
27 | #include <sys/sockio.h> | |
28 | #endif | |
29 | ||
30 | #ifndef X11_UNIX_PATH | |
31 | # define X11_UNIX_PATH "/tmp/.X11-unix/X" | |
32 | #endif | |
33 | ||
34 | /* | |
35 | * Access to sockaddr types without breaking C strict aliasing rules. | |
36 | */ | |
37 | union sockaddr_union { | |
38 | #ifdef NO_IPV6 | |
39 | struct sockaddr_in storage; | |
40 | #else | |
41 | struct sockaddr_storage storage; | |
42 | struct sockaddr_in6 sin6; | |
43 | #endif | |
44 | struct sockaddr sa; | |
45 | struct sockaddr_in sin; | |
46 | struct sockaddr_un su; | |
47 | }; | |
48 | ||
49 | /* | |
50 | * We used to typedef struct Socket_tag *Socket. | |
51 | * | |
52 | * Since we have made the networking abstraction slightly more | |
53 | * abstract, Socket no longer means a tcp socket (it could mean | |
54 | * an ssl socket). So now we must use Actual_Socket when we know | |
55 | * we are talking about a tcp socket. | |
56 | */ | |
57 | typedef struct Socket_tag *Actual_Socket; | |
58 | ||
59 | /* | |
60 | * Mutable state that goes with a SockAddr: stores information | |
61 | * about where in the list of candidate IP(v*) addresses we've | |
62 | * currently got to. | |
63 | */ | |
64 | typedef struct SockAddrStep_tag SockAddrStep; | |
65 | struct SockAddrStep_tag { | |
66 | #ifndef NO_IPV6 | |
67 | struct addrinfo *ai; /* steps along addr->ais */ | |
68 | #endif | |
69 | int curraddr; | |
70 | }; | |
71 | ||
72 | struct Socket_tag { | |
73 | struct socket_function_table *fn; | |
74 | /* the above variable absolutely *must* be the first in this structure */ | |
75 | const char *error; | |
76 | int s; | |
77 | Plug plug; | |
78 | void *private_ptr; | |
79 | bufchain output_data; | |
80 | int connected; /* irrelevant for listening sockets */ | |
81 | int writable; | |
82 | int frozen; /* this causes readability notifications to be ignored */ | |
83 | int frozen_readable; /* this means we missed at least one readability | |
84 | * notification while we were frozen */ | |
85 | int localhost_only; /* for listening sockets */ | |
86 | char oobdata[1]; | |
87 | int sending_oob; | |
88 | int oobpending; /* is there OOB data available to read? */ | |
89 | int oobinline; | |
90 | int pending_error; /* in case send() returns error */ | |
91 | int listener; | |
92 | int nodelay, keepalive; /* for connect()-type sockets */ | |
93 | int privport, port; /* and again */ | |
94 | SockAddr addr; | |
95 | SockAddrStep step; | |
96 | /* | |
97 | * We sometimes need pairs of Socket structures to be linked: | |
98 | * if we are listening on the same IPv6 and v4 port, for | |
99 | * example. So here we define `parent' and `child' pointers to | |
100 | * track this link. | |
101 | */ | |
102 | Actual_Socket parent, child; | |
103 | }; | |
104 | ||
105 | struct SockAddr_tag { | |
106 | int refcount; | |
107 | const char *error; | |
108 | enum { UNRESOLVED, UNIX, IP } superfamily; | |
109 | #ifndef NO_IPV6 | |
110 | struct addrinfo *ais; /* Addresses IPv6 style. */ | |
111 | #else | |
112 | unsigned long *addresses; /* Addresses IPv4 style. */ | |
113 | int naddresses; | |
114 | #endif | |
115 | char hostname[512]; /* Store an unresolved host name. */ | |
116 | }; | |
117 | ||
118 | /* | |
119 | * Which address family this address belongs to. AF_INET for IPv4; | |
120 | * AF_INET6 for IPv6; AF_UNSPEC indicates that name resolution has | |
121 | * not been done and a simple host name is held in this SockAddr | |
122 | * structure. | |
123 | */ | |
124 | #ifndef NO_IPV6 | |
125 | #define SOCKADDR_FAMILY(addr, step) \ | |
126 | ((addr)->superfamily == UNRESOLVED ? AF_UNSPEC : \ | |
127 | (addr)->superfamily == UNIX ? AF_UNIX : \ | |
128 | (step).ai ? (step).ai->ai_family : AF_INET) | |
129 | #else | |
130 | #define SOCKADDR_FAMILY(addr, step) \ | |
131 | ((addr)->superfamily == UNRESOLVED ? AF_UNSPEC : \ | |
132 | (addr)->superfamily == UNIX ? AF_UNIX : AF_INET) | |
133 | #endif | |
134 | ||
135 | /* | |
136 | * Start a SockAddrStep structure to step through multiple | |
137 | * addresses. | |
138 | */ | |
139 | #ifndef NO_IPV6 | |
140 | #define START_STEP(addr, step) \ | |
141 | ((step).ai = (addr)->ais, (step).curraddr = 0) | |
142 | #else | |
143 | #define START_STEP(addr, step) \ | |
144 | ((step).curraddr = 0) | |
145 | #endif | |
146 | ||
147 | static tree234 *sktree; | |
148 | ||
149 | static void uxsel_tell(Actual_Socket s); | |
150 | ||
151 | static int cmpfortree(void *av, void *bv) | |
152 | { | |
153 | Actual_Socket a = (Actual_Socket) av, b = (Actual_Socket) bv; | |
154 | int as = a->s, bs = b->s; | |
155 | if (as < bs) | |
156 | return -1; | |
157 | if (as > bs) | |
158 | return +1; | |
159 | if (a < b) | |
160 | return -1; | |
161 | if (a > b) | |
162 | return +1; | |
163 | return 0; | |
164 | } | |
165 | ||
166 | static int cmpforsearch(void *av, void *bv) | |
167 | { | |
168 | Actual_Socket b = (Actual_Socket) bv; | |
169 | int as = *(int *)av, bs = b->s; | |
170 | if (as < bs) | |
171 | return -1; | |
172 | if (as > bs) | |
173 | return +1; | |
174 | return 0; | |
175 | } | |
176 | ||
177 | void sk_init(void) | |
178 | { | |
179 | sktree = newtree234(cmpfortree); | |
180 | } | |
181 | ||
182 | void sk_cleanup(void) | |
183 | { | |
184 | Actual_Socket s; | |
185 | int i; | |
186 | ||
187 | if (sktree) { | |
188 | for (i = 0; (s = index234(sktree, i)) != NULL; i++) { | |
189 | close(s->s); | |
190 | } | |
191 | } | |
192 | } | |
193 | ||
194 | SockAddr sk_namelookup(const char *host, char **canonicalname, int address_family) | |
195 | { | |
196 | SockAddr ret = snew(struct SockAddr_tag); | |
197 | #ifndef NO_IPV6 | |
198 | struct addrinfo hints; | |
199 | int err; | |
200 | #else | |
201 | unsigned long a; | |
202 | struct hostent *h = NULL; | |
203 | int n; | |
204 | #endif | |
205 | char realhost[8192]; | |
206 | ||
207 | /* Clear the structure and default to IPv4. */ | |
208 | memset(ret, 0, sizeof(struct SockAddr_tag)); | |
209 | ret->superfamily = UNRESOLVED; | |
210 | *realhost = '\0'; | |
211 | ret->error = NULL; | |
212 | ret->refcount = 1; | |
213 | ||
214 | #ifndef NO_IPV6 | |
215 | hints.ai_flags = AI_CANONNAME; | |
216 | hints.ai_family = (address_family == ADDRTYPE_IPV4 ? AF_INET : | |
217 | address_family == ADDRTYPE_IPV6 ? AF_INET6 : | |
218 | AF_UNSPEC); | |
219 | hints.ai_socktype = SOCK_STREAM; | |
220 | hints.ai_protocol = 0; | |
221 | hints.ai_addrlen = 0; | |
222 | hints.ai_addr = NULL; | |
223 | hints.ai_canonname = NULL; | |
224 | hints.ai_next = NULL; | |
225 | err = getaddrinfo(host, NULL, &hints, &ret->ais); | |
226 | if (err != 0) { | |
227 | ret->error = gai_strerror(err); | |
228 | return ret; | |
229 | } | |
230 | ret->superfamily = IP; | |
231 | *realhost = '\0'; | |
232 | if (ret->ais->ai_canonname != NULL) | |
233 | strncat(realhost, ret->ais->ai_canonname, sizeof(realhost) - 1); | |
234 | else | |
235 | strncat(realhost, host, sizeof(realhost) - 1); | |
236 | #else | |
237 | if ((a = inet_addr(host)) == (unsigned long)(in_addr_t)(-1)) { | |
238 | /* | |
239 | * Otherwise use the IPv4-only gethostbyname... (NOTE: | |
240 | * we don't use gethostbyname as a fallback!) | |
241 | */ | |
242 | if (ret->superfamily == UNRESOLVED) { | |
243 | /*debug(("Resolving \"%s\" with gethostbyname() (IPv4 only)...\n", host)); */ | |
244 | if ( (h = gethostbyname(host)) ) | |
245 | ret->superfamily = IP; | |
246 | } | |
247 | if (ret->superfamily == UNRESOLVED) { | |
248 | ret->error = (h_errno == HOST_NOT_FOUND || | |
249 | h_errno == NO_DATA || | |
250 | h_errno == NO_ADDRESS ? "Host does not exist" : | |
251 | h_errno == TRY_AGAIN ? | |
252 | "Temporary name service failure" : | |
253 | "gethostbyname: unknown error"); | |
254 | return ret; | |
255 | } | |
256 | /* This way we are always sure the h->h_name is valid :) */ | |
257 | strncpy(realhost, h->h_name, sizeof(realhost)); | |
258 | for (n = 0; h->h_addr_list[n]; n++); | |
259 | ret->addresses = snewn(n, unsigned long); | |
260 | ret->naddresses = n; | |
261 | for (n = 0; n < ret->naddresses; n++) { | |
262 | memcpy(&a, h->h_addr_list[n], sizeof(a)); | |
263 | ret->addresses[n] = ntohl(a); | |
264 | } | |
265 | } else { | |
266 | /* | |
267 | * This must be a numeric IPv4 address because it caused a | |
268 | * success return from inet_addr. | |
269 | */ | |
270 | ret->superfamily = IP; | |
271 | strncpy(realhost, host, sizeof(realhost)); | |
272 | ret->addresses = snew(unsigned long); | |
273 | ret->naddresses = 1; | |
274 | ret->addresses[0] = ntohl(a); | |
275 | } | |
276 | #endif | |
277 | realhost[lenof(realhost)-1] = '\0'; | |
278 | *canonicalname = snewn(1+strlen(realhost), char); | |
279 | strcpy(*canonicalname, realhost); | |
280 | return ret; | |
281 | } | |
282 | ||
283 | SockAddr sk_nonamelookup(const char *host) | |
284 | { | |
285 | SockAddr ret = snew(struct SockAddr_tag); | |
286 | ret->error = NULL; | |
287 | ret->superfamily = UNRESOLVED; | |
288 | strncpy(ret->hostname, host, lenof(ret->hostname)); | |
289 | ret->hostname[lenof(ret->hostname)-1] = '\0'; | |
290 | #ifndef NO_IPV6 | |
291 | ret->ais = NULL; | |
292 | #else | |
293 | ret->addresses = NULL; | |
294 | #endif | |
295 | ret->refcount = 1; | |
296 | return ret; | |
297 | } | |
298 | ||
299 | static int sk_nextaddr(SockAddr addr, SockAddrStep *step) | |
300 | { | |
301 | #ifndef NO_IPV6 | |
302 | if (step->ai && step->ai->ai_next) { | |
303 | step->ai = step->ai->ai_next; | |
304 | return TRUE; | |
305 | } else | |
306 | return FALSE; | |
307 | #else | |
308 | if (step->curraddr+1 < addr->naddresses) { | |
309 | step->curraddr++; | |
310 | return TRUE; | |
311 | } else { | |
312 | return FALSE; | |
313 | } | |
314 | #endif | |
315 | } | |
316 | ||
317 | void sk_getaddr(SockAddr addr, char *buf, int buflen) | |
318 | { | |
319 | /* XXX not clear what we should return for Unix-domain sockets; let's | |
320 | * hope the question never arises */ | |
321 | assert(addr->superfamily != UNIX); | |
322 | if (addr->superfamily == UNRESOLVED) { | |
323 | strncpy(buf, addr->hostname, buflen); | |
324 | buf[buflen-1] = '\0'; | |
325 | } else { | |
326 | #ifndef NO_IPV6 | |
327 | if (getnameinfo(addr->ais->ai_addr, addr->ais->ai_addrlen, buf, buflen, | |
328 | NULL, 0, NI_NUMERICHOST) != 0) { | |
329 | buf[0] = '\0'; | |
330 | strncat(buf, "<unknown>", buflen - 1); | |
331 | } | |
332 | #else | |
333 | struct in_addr a; | |
334 | SockAddrStep step; | |
335 | START_STEP(addr, step); | |
336 | assert(SOCKADDR_FAMILY(addr, step) == AF_INET); | |
337 | a.s_addr = htonl(addr->addresses[0]); | |
338 | strncpy(buf, inet_ntoa(a), buflen); | |
339 | buf[buflen-1] = '\0'; | |
340 | #endif | |
341 | } | |
342 | } | |
343 | ||
344 | int sk_hostname_is_local(char *name) | |
345 | { | |
346 | return !strcmp(name, "localhost") || | |
347 | !strcmp(name, "::1") || | |
348 | !strncmp(name, "127.", 4); | |
349 | } | |
350 | ||
351 | #define ipv4_is_loopback(addr) \ | |
352 | (((addr).s_addr & htonl(0xff000000)) == htonl(0x7f000000)) | |
353 | ||
354 | static int sockaddr_is_loopback(struct sockaddr *sa) | |
355 | { | |
356 | union sockaddr_union *u = (union sockaddr_union *)sa; | |
357 | switch (u->sa.sa_family) { | |
358 | case AF_INET: | |
359 | return ipv4_is_loopback(u->sin.sin_addr); | |
360 | #ifndef NO_IPV6 | |
361 | case AF_INET6: | |
362 | return IN6_IS_ADDR_LOOPBACK(&u->sin6.sin6_addr); | |
363 | #endif | |
364 | case AF_UNIX: | |
365 | return TRUE; | |
366 | default: | |
367 | return FALSE; | |
368 | } | |
369 | } | |
370 | ||
371 | int sk_address_is_local(SockAddr addr) | |
372 | { | |
373 | if (addr->superfamily == UNRESOLVED) | |
374 | return 0; /* we don't know; assume not */ | |
375 | else if (addr->superfamily == UNIX) | |
376 | return 1; | |
377 | else { | |
378 | #ifndef NO_IPV6 | |
379 | return sockaddr_is_loopback(addr->ais->ai_addr); | |
380 | #else | |
381 | struct in_addr a; | |
382 | SockAddrStep step; | |
383 | START_STEP(addr, step); | |
384 | assert(SOCKADDR_FAMILY(addr, step) == AF_INET); | |
385 | a.s_addr = htonl(addr->addresses[0]); | |
386 | return ipv4_is_loopback(a); | |
387 | #endif | |
388 | } | |
389 | } | |
390 | ||
391 | int sk_addrtype(SockAddr addr) | |
392 | { | |
393 | SockAddrStep step; | |
394 | int family; | |
395 | START_STEP(addr, step); | |
396 | family = SOCKADDR_FAMILY(addr, step); | |
397 | ||
398 | return (family == AF_INET ? ADDRTYPE_IPV4 : | |
399 | #ifndef NO_IPV6 | |
400 | family == AF_INET6 ? ADDRTYPE_IPV6 : | |
401 | #endif | |
402 | ADDRTYPE_NAME); | |
403 | } | |
404 | ||
405 | void sk_addrcopy(SockAddr addr, char *buf) | |
406 | { | |
407 | SockAddrStep step; | |
408 | int family; | |
409 | START_STEP(addr, step); | |
410 | family = SOCKADDR_FAMILY(addr, step); | |
411 | ||
412 | #ifndef NO_IPV6 | |
413 | if (family == AF_INET) | |
414 | memcpy(buf, &((struct sockaddr_in *)step.ai->ai_addr)->sin_addr, | |
415 | sizeof(struct in_addr)); | |
416 | else if (family == AF_INET6) | |
417 | memcpy(buf, &((struct sockaddr_in6 *)step.ai->ai_addr)->sin6_addr, | |
418 | sizeof(struct in6_addr)); | |
419 | else | |
420 | assert(FALSE); | |
421 | #else | |
422 | struct in_addr a; | |
423 | ||
424 | assert(family == AF_INET); | |
425 | a.s_addr = htonl(addr->addresses[step.curraddr]); | |
426 | memcpy(buf, (char*) &a.s_addr, 4); | |
427 | #endif | |
428 | } | |
429 | ||
430 | void sk_addr_free(SockAddr addr) | |
431 | { | |
432 | if (--addr->refcount > 0) | |
433 | return; | |
434 | #ifndef NO_IPV6 | |
435 | if (addr->ais != NULL) | |
436 | freeaddrinfo(addr->ais); | |
437 | #else | |
438 | sfree(addr->addresses); | |
439 | #endif | |
440 | sfree(addr); | |
441 | } | |
442 | ||
443 | SockAddr sk_addr_dup(SockAddr addr) | |
444 | { | |
445 | addr->refcount++; | |
446 | return addr; | |
447 | } | |
448 | ||
449 | static Plug sk_tcp_plug(Socket sock, Plug p) | |
450 | { | |
451 | Actual_Socket s = (Actual_Socket) sock; | |
452 | Plug ret = s->plug; | |
453 | if (p) | |
454 | s->plug = p; | |
455 | return ret; | |
456 | } | |
457 | ||
458 | static void sk_tcp_flush(Socket s) | |
459 | { | |
460 | /* | |
461 | * We send data to the socket as soon as we can anyway, | |
462 | * so we don't need to do anything here. :-) | |
463 | */ | |
464 | } | |
465 | ||
466 | static void sk_tcp_close(Socket s); | |
467 | static int sk_tcp_write(Socket s, const char *data, int len); | |
468 | static int sk_tcp_write_oob(Socket s, const char *data, int len); | |
469 | static void sk_tcp_set_private_ptr(Socket s, void *ptr); | |
470 | static void *sk_tcp_get_private_ptr(Socket s); | |
471 | static void sk_tcp_set_frozen(Socket s, int is_frozen); | |
472 | static const char *sk_tcp_socket_error(Socket s); | |
473 | ||
474 | static struct socket_function_table tcp_fn_table = { | |
475 | sk_tcp_plug, | |
476 | sk_tcp_close, | |
477 | sk_tcp_write, | |
478 | sk_tcp_write_oob, | |
479 | sk_tcp_flush, | |
480 | sk_tcp_set_private_ptr, | |
481 | sk_tcp_get_private_ptr, | |
482 | sk_tcp_set_frozen, | |
483 | sk_tcp_socket_error | |
484 | }; | |
485 | ||
486 | Socket sk_register(OSSocket sockfd, Plug plug) | |
487 | { | |
488 | Actual_Socket ret; | |
489 | ||
490 | /* | |
491 | * Create Socket structure. | |
492 | */ | |
493 | ret = snew(struct Socket_tag); | |
494 | ret->fn = &tcp_fn_table; | |
495 | ret->error = NULL; | |
496 | ret->plug = plug; | |
497 | bufchain_init(&ret->output_data); | |
498 | ret->writable = 1; /* to start with */ | |
499 | ret->sending_oob = 0; | |
500 | ret->frozen = 1; | |
501 | ret->frozen_readable = 0; | |
502 | ret->localhost_only = 0; /* unused, but best init anyway */ | |
503 | ret->pending_error = 0; | |
504 | ret->oobpending = FALSE; | |
505 | ret->listener = 0; | |
506 | ret->parent = ret->child = NULL; | |
507 | ret->addr = NULL; | |
508 | ret->connected = 1; | |
509 | ||
510 | ret->s = sockfd; | |
511 | ||
512 | if (ret->s < 0) { | |
513 | ret->error = strerror(errno); | |
514 | return (Socket) ret; | |
515 | } | |
516 | ||
517 | ret->oobinline = 0; | |
518 | ||
519 | uxsel_tell(ret); | |
520 | add234(sktree, ret); | |
521 | ||
522 | return (Socket) ret; | |
523 | } | |
524 | ||
525 | static int try_connect(Actual_Socket sock) | |
526 | { | |
527 | int s; | |
528 | union sockaddr_union u; | |
529 | const union sockaddr_union *sa; | |
530 | int err = 0; | |
531 | short localport; | |
532 | int fl, salen, family; | |
533 | ||
534 | /* | |
535 | * Remove the socket from the tree before we overwrite its | |
536 | * internal socket id, because that forms part of the tree's | |
537 | * sorting criterion. We'll add it back before exiting this | |
538 | * function, whether we changed anything or not. | |
539 | */ | |
540 | del234(sktree, sock); | |
541 | ||
542 | if (sock->s >= 0) | |
543 | close(sock->s); | |
544 | ||
545 | plug_log(sock->plug, 0, sock->addr, sock->port, NULL, 0); | |
546 | ||
547 | /* | |
548 | * Open socket. | |
549 | */ | |
550 | family = SOCKADDR_FAMILY(sock->addr, sock->step); | |
551 | assert(family != AF_UNSPEC); | |
552 | s = socket(family, SOCK_STREAM, 0); | |
553 | sock->s = s; | |
554 | ||
555 | if (s < 0) { | |
556 | err = errno; | |
557 | goto ret; | |
558 | } | |
559 | ||
560 | cloexec(s); | |
561 | ||
562 | if (sock->oobinline) { | |
563 | int b = TRUE; | |
564 | setsockopt(s, SOL_SOCKET, SO_OOBINLINE, (void *) &b, sizeof(b)); | |
565 | } | |
566 | ||
567 | if (sock->nodelay) { | |
568 | int b = TRUE; | |
569 | setsockopt(s, IPPROTO_TCP, TCP_NODELAY, (void *) &b, sizeof(b)); | |
570 | } | |
571 | ||
572 | if (sock->keepalive) { | |
573 | int b = TRUE; | |
574 | setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, (void *) &b, sizeof(b)); | |
575 | } | |
576 | ||
577 | /* | |
578 | * Bind to local address. | |
579 | */ | |
580 | if (sock->privport) | |
581 | localport = 1023; /* count from 1023 downwards */ | |
582 | else | |
583 | localport = 0; /* just use port 0 (ie kernel picks) */ | |
584 | ||
585 | /* BSD IP stacks need sockaddr_in zeroed before filling in */ | |
586 | memset(&u,'\0',sizeof(u)); | |
587 | ||
588 | /* We don't try to bind to a local address for UNIX domain sockets. (Why | |
589 | * do we bother doing the bind when localport == 0 anyway?) */ | |
590 | if (family != AF_UNIX) { | |
591 | /* Loop round trying to bind */ | |
592 | while (1) { | |
593 | int retcode; | |
594 | ||
595 | #ifndef NO_IPV6 | |
596 | if (family == AF_INET6) { | |
597 | /* XXX use getaddrinfo to get a local address? */ | |
598 | u.sin6.sin6_family = AF_INET6; | |
599 | u.sin6.sin6_addr = in6addr_any; | |
600 | u.sin6.sin6_port = htons(localport); | |
601 | retcode = bind(s, &u.sa, sizeof(u.sin6)); | |
602 | } else | |
603 | #endif | |
604 | { | |
605 | assert(family == AF_INET); | |
606 | u.sin.sin_family = AF_INET; | |
607 | u.sin.sin_addr.s_addr = htonl(INADDR_ANY); | |
608 | u.sin.sin_port = htons(localport); | |
609 | retcode = bind(s, &u.sa, sizeof(u.sin)); | |
610 | } | |
611 | if (retcode >= 0) { | |
612 | err = 0; | |
613 | break; /* done */ | |
614 | } else { | |
615 | err = errno; | |
616 | if (err != EADDRINUSE) /* failed, for a bad reason */ | |
617 | break; | |
618 | } | |
619 | ||
620 | if (localport == 0) | |
621 | break; /* we're only looping once */ | |
622 | localport--; | |
623 | if (localport == 0) | |
624 | break; /* we might have got to the end */ | |
625 | } | |
626 | ||
627 | if (err) | |
628 | goto ret; | |
629 | } | |
630 | ||
631 | /* | |
632 | * Connect to remote address. | |
633 | */ | |
634 | switch(family) { | |
635 | #ifndef NO_IPV6 | |
636 | case AF_INET: | |
637 | /* XXX would be better to have got getaddrinfo() to fill in the port. */ | |
638 | ((struct sockaddr_in *)sock->step.ai->ai_addr)->sin_port = | |
639 | htons(sock->port); | |
640 | sa = (const union sockaddr_union *)sock->step.ai->ai_addr; | |
641 | salen = sock->step.ai->ai_addrlen; | |
642 | break; | |
643 | case AF_INET6: | |
644 | ((struct sockaddr_in *)sock->step.ai->ai_addr)->sin_port = | |
645 | htons(sock->port); | |
646 | sa = (const union sockaddr_union *)sock->step.ai->ai_addr; | |
647 | salen = sock->step.ai->ai_addrlen; | |
648 | break; | |
649 | #else | |
650 | case AF_INET: | |
651 | u.sin.sin_family = AF_INET; | |
652 | u.sin.sin_addr.s_addr = htonl(sock->addr->addresses[sock->step.curraddr]); | |
653 | u.sin.sin_port = htons((short) sock->port); | |
654 | sa = &u; | |
655 | salen = sizeof u.sin; | |
656 | break; | |
657 | #endif | |
658 | case AF_UNIX: | |
659 | assert(sock->port == 0); /* to catch confused people */ | |
660 | assert(strlen(sock->addr->hostname) < sizeof u.su.sun_path); | |
661 | u.su.sun_family = AF_UNIX; | |
662 | strcpy(u.su.sun_path, sock->addr->hostname); | |
663 | sa = &u; | |
664 | salen = sizeof u.su; | |
665 | break; | |
666 | ||
667 | default: | |
668 | assert(0 && "unknown address family"); | |
669 | exit(1); /* XXX: GCC doesn't understand assert() on some systems. */ | |
670 | } | |
671 | ||
672 | fl = fcntl(s, F_GETFL); | |
673 | if (fl != -1) | |
674 | fcntl(s, F_SETFL, fl | O_NONBLOCK); | |
675 | ||
676 | if ((connect(s, &(sa->sa), salen)) < 0) { | |
677 | if ( errno != EINPROGRESS ) { | |
678 | err = errno; | |
679 | goto ret; | |
680 | } | |
681 | } else { | |
682 | /* | |
683 | * If we _don't_ get EWOULDBLOCK, the connect has completed | |
684 | * and we should set the socket as connected and writable. | |
685 | */ | |
686 | sock->connected = 1; | |
687 | sock->writable = 1; | |
688 | } | |
689 | ||
690 | uxsel_tell(sock); | |
691 | ||
692 | ret: | |
693 | ||
694 | /* | |
695 | * No matter what happened, put the socket back in the tree. | |
696 | */ | |
697 | add234(sktree, sock); | |
698 | ||
699 | if (err) | |
700 | plug_log(sock->plug, 1, sock->addr, sock->port, strerror(err), err); | |
701 | return err; | |
702 | } | |
703 | ||
704 | Socket sk_new(SockAddr addr, int port, int privport, int oobinline, | |
705 | int nodelay, int keepalive, Plug plug) | |
706 | { | |
707 | Actual_Socket ret; | |
708 | int err; | |
709 | ||
710 | /* | |
711 | * Create Socket structure. | |
712 | */ | |
713 | ret = snew(struct Socket_tag); | |
714 | ret->fn = &tcp_fn_table; | |
715 | ret->error = NULL; | |
716 | ret->plug = plug; | |
717 | bufchain_init(&ret->output_data); | |
718 | ret->connected = 0; /* to start with */ | |
719 | ret->writable = 0; /* to start with */ | |
720 | ret->sending_oob = 0; | |
721 | ret->frozen = 0; | |
722 | ret->frozen_readable = 0; | |
723 | ret->localhost_only = 0; /* unused, but best init anyway */ | |
724 | ret->pending_error = 0; | |
725 | ret->parent = ret->child = NULL; | |
726 | ret->oobpending = FALSE; | |
727 | ret->listener = 0; | |
728 | ret->addr = addr; | |
729 | START_STEP(ret->addr, ret->step); | |
730 | ret->s = -1; | |
731 | ret->oobinline = oobinline; | |
732 | ret->nodelay = nodelay; | |
733 | ret->keepalive = keepalive; | |
734 | ret->privport = privport; | |
735 | ret->port = port; | |
736 | ||
737 | err = 0; | |
738 | do { | |
739 | err = try_connect(ret); | |
740 | } while (err && sk_nextaddr(ret->addr, &ret->step)); | |
741 | ||
742 | if (err) | |
743 | ret->error = strerror(err); | |
744 | ||
745 | return (Socket) ret; | |
746 | } | |
747 | ||
748 | Socket sk_newlistener(char *srcaddr, int port, Plug plug, int local_host_only, int orig_address_family) | |
749 | { | |
750 | int s; | |
751 | #ifndef NO_IPV6 | |
752 | struct addrinfo hints, *ai; | |
753 | char portstr[6]; | |
754 | #endif | |
755 | union sockaddr_union u; | |
756 | union sockaddr_union *addr; | |
757 | int addrlen; | |
758 | Actual_Socket ret; | |
759 | int retcode; | |
760 | int address_family; | |
761 | int on = 1; | |
762 | ||
763 | /* | |
764 | * Create Socket structure. | |
765 | */ | |
766 | ret = snew(struct Socket_tag); | |
767 | ret->fn = &tcp_fn_table; | |
768 | ret->error = NULL; | |
769 | ret->plug = plug; | |
770 | bufchain_init(&ret->output_data); | |
771 | ret->writable = 0; /* to start with */ | |
772 | ret->sending_oob = 0; | |
773 | ret->frozen = 0; | |
774 | ret->frozen_readable = 0; | |
775 | ret->localhost_only = local_host_only; | |
776 | ret->pending_error = 0; | |
777 | ret->parent = ret->child = NULL; | |
778 | ret->oobpending = FALSE; | |
779 | ret->listener = 1; | |
780 | ret->addr = NULL; | |
781 | ||
782 | /* | |
783 | * Translate address_family from platform-independent constants | |
784 | * into local reality. | |
785 | */ | |
786 | address_family = (orig_address_family == ADDRTYPE_IPV4 ? AF_INET : | |
787 | #ifndef NO_IPV6 | |
788 | orig_address_family == ADDRTYPE_IPV6 ? AF_INET6 : | |
789 | #endif | |
790 | AF_UNSPEC); | |
791 | ||
792 | #ifndef NO_IPV6 | |
793 | /* Let's default to IPv6. | |
794 | * If the stack doesn't support IPv6, we will fall back to IPv4. */ | |
795 | if (address_family == AF_UNSPEC) address_family = AF_INET6; | |
796 | #else | |
797 | /* No other choice, default to IPv4 */ | |
798 | if (address_family == AF_UNSPEC) address_family = AF_INET; | |
799 | #endif | |
800 | ||
801 | /* | |
802 | * Open socket. | |
803 | */ | |
804 | s = socket(address_family, SOCK_STREAM, 0); | |
805 | ||
806 | #ifndef NO_IPV6 | |
807 | /* If the host doesn't support IPv6 try fallback to IPv4. */ | |
808 | if (s < 0 && address_family == AF_INET6) { | |
809 | address_family = AF_INET; | |
810 | s = socket(address_family, SOCK_STREAM, 0); | |
811 | } | |
812 | #endif | |
813 | ||
814 | if (s < 0) { | |
815 | ret->error = strerror(errno); | |
816 | return (Socket) ret; | |
817 | } | |
818 | ||
819 | cloexec(s); | |
820 | ||
821 | ret->oobinline = 0; | |
822 | ||
823 | setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (const char *)&on, sizeof(on)); | |
824 | ||
825 | retcode = -1; | |
826 | addr = NULL; addrlen = -1; /* placate optimiser */ | |
827 | ||
828 | if (srcaddr != NULL) { | |
829 | #ifndef NO_IPV6 | |
830 | hints.ai_flags = AI_NUMERICHOST; | |
831 | hints.ai_family = address_family; | |
832 | hints.ai_socktype = SOCK_STREAM; | |
833 | hints.ai_protocol = 0; | |
834 | hints.ai_addrlen = 0; | |
835 | hints.ai_addr = NULL; | |
836 | hints.ai_canonname = NULL; | |
837 | hints.ai_next = NULL; | |
838 | assert(port >= 0 && port <= 99999); | |
839 | sprintf(portstr, "%d", port); | |
840 | retcode = getaddrinfo(srcaddr, portstr, &hints, &ai); | |
841 | if (retcode == 0) { | |
842 | addr = (union sockaddr_union *)ai->ai_addr; | |
843 | addrlen = ai->ai_addrlen; | |
844 | } | |
845 | #else | |
846 | memset(&u,'\0',sizeof u); | |
847 | u.sin.sin_family = AF_INET; | |
848 | u.sin.sin_port = htons(port); | |
849 | u.sin.sin_addr.s_addr = inet_addr(srcaddr); | |
850 | if (u.sin.sin_addr.s_addr != (in_addr_t)(-1)) { | |
851 | /* Override localhost_only with specified listen addr. */ | |
852 | ret->localhost_only = ipv4_is_loopback(u.sin.sin_addr); | |
853 | } | |
854 | addr = &u; | |
855 | addrlen = sizeof(u.sin); | |
856 | retcode = 0; | |
857 | #endif | |
858 | } | |
859 | ||
860 | if (retcode != 0) { | |
861 | memset(&u,'\0',sizeof u); | |
862 | #ifndef NO_IPV6 | |
863 | if (address_family == AF_INET6) { | |
864 | u.sin6.sin6_family = AF_INET6; | |
865 | u.sin6.sin6_port = htons(port); | |
866 | if (local_host_only) | |
867 | u.sin6.sin6_addr = in6addr_loopback; | |
868 | else | |
869 | u.sin6.sin6_addr = in6addr_any; | |
870 | addr = &u; | |
871 | addrlen = sizeof(u.sin6); | |
872 | } else | |
873 | #endif | |
874 | { | |
875 | u.sin.sin_family = AF_INET; | |
876 | u.sin.sin_port = htons(port); | |
877 | if (local_host_only) | |
878 | u.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK); | |
879 | else | |
880 | u.sin.sin_addr.s_addr = htonl(INADDR_ANY); | |
881 | addr = &u; | |
882 | addrlen = sizeof(u.sin); | |
883 | } | |
884 | } | |
885 | ||
886 | retcode = bind(s, &addr->sa, addrlen); | |
887 | if (retcode < 0) { | |
888 | close(s); | |
889 | ret->error = strerror(errno); | |
890 | return (Socket) ret; | |
891 | } | |
892 | ||
893 | if (listen(s, SOMAXCONN) < 0) { | |
894 | close(s); | |
895 | ret->error = strerror(errno); | |
896 | return (Socket) ret; | |
897 | } | |
898 | ||
899 | #ifndef NO_IPV6 | |
900 | /* | |
901 | * If we were given ADDRTYPE_UNSPEC, we must also create an | |
902 | * IPv4 listening socket and link it to this one. | |
903 | */ | |
904 | if (address_family == AF_INET6 && orig_address_family == ADDRTYPE_UNSPEC) { | |
905 | Actual_Socket other; | |
906 | ||
907 | other = (Actual_Socket) sk_newlistener(srcaddr, port, plug, | |
908 | local_host_only, ADDRTYPE_IPV4); | |
909 | ||
910 | if (other) { | |
911 | if (!other->error) { | |
912 | other->parent = ret; | |
913 | ret->child = other; | |
914 | } else { | |
915 | /* If we couldn't create a listening socket on IPv4 as well | |
916 | * as IPv6, we must return an error overall. */ | |
917 | close(s); | |
918 | sfree(ret); | |
919 | return (Socket) other; | |
920 | } | |
921 | } | |
922 | } | |
923 | #endif | |
924 | ||
925 | ret->s = s; | |
926 | ||
927 | uxsel_tell(ret); | |
928 | add234(sktree, ret); | |
929 | ||
930 | return (Socket) ret; | |
931 | } | |
932 | ||
933 | static void sk_tcp_close(Socket sock) | |
934 | { | |
935 | Actual_Socket s = (Actual_Socket) sock; | |
936 | ||
937 | if (s->child) | |
938 | sk_tcp_close((Socket)s->child); | |
939 | ||
940 | uxsel_del(s->s); | |
941 | del234(sktree, s); | |
942 | close(s->s); | |
943 | if (s->addr) | |
944 | sk_addr_free(s->addr); | |
945 | sfree(s); | |
946 | } | |
947 | ||
948 | void *sk_getxdmdata(void *sock, int *lenp) | |
949 | { | |
950 | Actual_Socket s = (Actual_Socket) sock; | |
951 | union sockaddr_union u; | |
952 | socklen_t addrlen; | |
953 | char *buf; | |
954 | static unsigned int unix_addr = 0xFFFFFFFF; | |
955 | ||
956 | /* | |
957 | * We must check that this socket really _is_ an Actual_Socket. | |
958 | */ | |
959 | if (s->fn != &tcp_fn_table) | |
960 | return NULL; /* failure */ | |
961 | ||
962 | addrlen = sizeof(u); | |
963 | if (getsockname(s->s, &u.sa, &addrlen) < 0) | |
964 | return NULL; | |
965 | switch(u.sa.sa_family) { | |
966 | case AF_INET: | |
967 | *lenp = 6; | |
968 | buf = snewn(*lenp, char); | |
969 | PUT_32BIT_MSB_FIRST(buf, ntohl(u.sin.sin_addr.s_addr)); | |
970 | PUT_16BIT_MSB_FIRST(buf+4, ntohs(u.sin.sin_port)); | |
971 | break; | |
972 | #ifndef NO_IPV6 | |
973 | case AF_INET6: | |
974 | *lenp = 6; | |
975 | buf = snewn(*lenp, char); | |
976 | if (IN6_IS_ADDR_V4MAPPED(&u.sin6.sin6_addr)) { | |
977 | memcpy(buf, u.sin6.sin6_addr.s6_addr + 12, 4); | |
978 | PUT_16BIT_MSB_FIRST(buf+4, ntohs(u.sin6.sin6_port)); | |
979 | } else | |
980 | /* This is stupid, but it's what XLib does. */ | |
981 | memset(buf, 0, 6); | |
982 | break; | |
983 | #endif | |
984 | case AF_UNIX: | |
985 | *lenp = 6; | |
986 | buf = snewn(*lenp, char); | |
987 | PUT_32BIT_MSB_FIRST(buf, unix_addr--); | |
988 | PUT_16BIT_MSB_FIRST(buf+4, getpid()); | |
989 | break; | |
990 | ||
991 | /* XXX IPV6 */ | |
992 | ||
993 | default: | |
994 | return NULL; | |
995 | } | |
996 | ||
997 | return buf; | |
998 | } | |
999 | ||
1000 | /* | |
1001 | * The function which tries to send on a socket once it's deemed | |
1002 | * writable. | |
1003 | */ | |
1004 | void try_send(Actual_Socket s) | |
1005 | { | |
1006 | while (s->sending_oob || bufchain_size(&s->output_data) > 0) { | |
1007 | int nsent; | |
1008 | int err; | |
1009 | void *data; | |
1010 | int len, urgentflag; | |
1011 | ||
1012 | if (s->sending_oob) { | |
1013 | urgentflag = MSG_OOB; | |
1014 | len = s->sending_oob; | |
1015 | data = &s->oobdata; | |
1016 | } else { | |
1017 | urgentflag = 0; | |
1018 | bufchain_prefix(&s->output_data, &data, &len); | |
1019 | } | |
1020 | nsent = send(s->s, data, len, urgentflag); | |
1021 | noise_ultralight(nsent); | |
1022 | if (nsent <= 0) { | |
1023 | err = (nsent < 0 ? errno : 0); | |
1024 | if (err == EWOULDBLOCK) { | |
1025 | /* | |
1026 | * Perfectly normal: we've sent all we can for the moment. | |
1027 | */ | |
1028 | s->writable = FALSE; | |
1029 | return; | |
1030 | } else { | |
1031 | /* | |
1032 | * We unfortunately can't just call plug_closing(), | |
1033 | * because it's quite likely that we're currently | |
1034 | * _in_ a call from the code we'd be calling back | |
1035 | * to, so we'd have to make half the SSH code | |
1036 | * reentrant. Instead we flag a pending error on | |
1037 | * the socket, to be dealt with (by calling | |
1038 | * plug_closing()) at some suitable future moment. | |
1039 | */ | |
1040 | s->pending_error = err; | |
1041 | return; | |
1042 | } | |
1043 | } else { | |
1044 | if (s->sending_oob) { | |
1045 | if (nsent < len) { | |
1046 | memmove(s->oobdata, s->oobdata+nsent, len-nsent); | |
1047 | s->sending_oob = len - nsent; | |
1048 | } else { | |
1049 | s->sending_oob = 0; | |
1050 | } | |
1051 | } else { | |
1052 | bufchain_consume(&s->output_data, nsent); | |
1053 | } | |
1054 | } | |
1055 | } | |
1056 | uxsel_tell(s); | |
1057 | } | |
1058 | ||
1059 | static int sk_tcp_write(Socket sock, const char *buf, int len) | |
1060 | { | |
1061 | Actual_Socket s = (Actual_Socket) sock; | |
1062 | ||
1063 | /* | |
1064 | * Add the data to the buffer list on the socket. | |
1065 | */ | |
1066 | bufchain_add(&s->output_data, buf, len); | |
1067 | ||
1068 | /* | |
1069 | * Now try sending from the start of the buffer list. | |
1070 | */ | |
1071 | if (s->writable) | |
1072 | try_send(s); | |
1073 | ||
1074 | /* | |
1075 | * Update the select() status to correctly reflect whether or | |
1076 | * not we should be selecting for write. | |
1077 | */ | |
1078 | uxsel_tell(s); | |
1079 | ||
1080 | return bufchain_size(&s->output_data); | |
1081 | } | |
1082 | ||
1083 | static int sk_tcp_write_oob(Socket sock, const char *buf, int len) | |
1084 | { | |
1085 | Actual_Socket s = (Actual_Socket) sock; | |
1086 | ||
1087 | /* | |
1088 | * Replace the buffer list on the socket with the data. | |
1089 | */ | |
1090 | bufchain_clear(&s->output_data); | |
1091 | assert(len <= sizeof(s->oobdata)); | |
1092 | memcpy(s->oobdata, buf, len); | |
1093 | s->sending_oob = len; | |
1094 | ||
1095 | /* | |
1096 | * Now try sending from the start of the buffer list. | |
1097 | */ | |
1098 | if (s->writable) | |
1099 | try_send(s); | |
1100 | ||
1101 | /* | |
1102 | * Update the select() status to correctly reflect whether or | |
1103 | * not we should be selecting for write. | |
1104 | */ | |
1105 | uxsel_tell(s); | |
1106 | ||
1107 | return s->sending_oob; | |
1108 | } | |
1109 | ||
1110 | static int net_select_result(int fd, int event) | |
1111 | { | |
1112 | int ret; | |
1113 | char buf[20480]; /* nice big buffer for plenty of speed */ | |
1114 | Actual_Socket s; | |
1115 | u_long atmark; | |
1116 | ||
1117 | /* Find the Socket structure */ | |
1118 | s = find234(sktree, &fd, cmpforsearch); | |
1119 | if (!s) | |
1120 | return 1; /* boggle */ | |
1121 | ||
1122 | noise_ultralight(event); | |
1123 | ||
1124 | switch (event) { | |
1125 | case 4: /* exceptional */ | |
1126 | if (!s->oobinline) { | |
1127 | /* | |
1128 | * On a non-oobinline socket, this indicates that we | |
1129 | * can immediately perform an OOB read and get back OOB | |
1130 | * data, which we will send to the back end with | |
1131 | * type==2 (urgent data). | |
1132 | */ | |
1133 | ret = recv(s->s, buf, sizeof(buf), MSG_OOB); | |
1134 | noise_ultralight(ret); | |
1135 | if (ret <= 0) { | |
1136 | return plug_closing(s->plug, | |
1137 | ret == 0 ? "Internal networking trouble" : | |
1138 | strerror(errno), errno, 0); | |
1139 | } else { | |
1140 | /* | |
1141 | * Receiving actual data on a socket means we can | |
1142 | * stop falling back through the candidate | |
1143 | * addresses to connect to. | |
1144 | */ | |
1145 | if (s->addr) { | |
1146 | sk_addr_free(s->addr); | |
1147 | s->addr = NULL; | |
1148 | } | |
1149 | return plug_receive(s->plug, 2, buf, ret); | |
1150 | } | |
1151 | break; | |
1152 | } | |
1153 | ||
1154 | /* | |
1155 | * If we reach here, this is an oobinline socket, which | |
1156 | * means we should set s->oobpending and then deal with it | |
1157 | * when we get called for the readability event (which | |
1158 | * should also occur). | |
1159 | */ | |
1160 | s->oobpending = TRUE; | |
1161 | break; | |
1162 | case 1: /* readable; also acceptance */ | |
1163 | if (s->listener) { | |
1164 | /* | |
1165 | * On a listening socket, the readability event means a | |
1166 | * connection is ready to be accepted. | |
1167 | */ | |
1168 | union sockaddr_union su; | |
1169 | socklen_t addrlen = sizeof(su); | |
1170 | int t; /* socket of connection */ | |
1171 | int fl; | |
1172 | ||
1173 | memset(&su, 0, addrlen); | |
1174 | t = accept(s->s, &su.sa, &addrlen); | |
1175 | if (t < 0) { | |
1176 | break; | |
1177 | } | |
1178 | ||
1179 | fl = fcntl(t, F_GETFL); | |
1180 | if (fl != -1) | |
1181 | fcntl(t, F_SETFL, fl | O_NONBLOCK); | |
1182 | ||
1183 | if (s->localhost_only && | |
1184 | !sockaddr_is_loopback(&su.sa)) { | |
1185 | close(t); /* someone let nonlocal through?! */ | |
1186 | } else if (plug_accepting(s->plug, t)) { | |
1187 | close(t); /* denied or error */ | |
1188 | } | |
1189 | break; | |
1190 | } | |
1191 | ||
1192 | /* | |
1193 | * If we reach here, this is not a listening socket, so | |
1194 | * readability really means readability. | |
1195 | */ | |
1196 | ||
1197 | /* In the case the socket is still frozen, we don't even bother */ | |
1198 | if (s->frozen) { | |
1199 | s->frozen_readable = 1; | |
1200 | break; | |
1201 | } | |
1202 | ||
1203 | /* | |
1204 | * We have received data on the socket. For an oobinline | |
1205 | * socket, this might be data _before_ an urgent pointer, | |
1206 | * in which case we send it to the back end with type==1 | |
1207 | * (data prior to urgent). | |
1208 | */ | |
1209 | if (s->oobinline && s->oobpending) { | |
1210 | atmark = 1; | |
1211 | if (ioctl(s->s, SIOCATMARK, &atmark) == 0 && atmark) | |
1212 | s->oobpending = FALSE; /* clear this indicator */ | |
1213 | } else | |
1214 | atmark = 1; | |
1215 | ||
1216 | ret = recv(s->s, buf, s->oobpending ? 1 : sizeof(buf), 0); | |
1217 | noise_ultralight(ret); | |
1218 | if (ret < 0) { | |
1219 | if (errno == EWOULDBLOCK) { | |
1220 | break; | |
1221 | } | |
1222 | } | |
1223 | if (ret < 0) { | |
1224 | /* | |
1225 | * An error at this point _might_ be an error reported | |
1226 | * by a non-blocking connect(). So before we return a | |
1227 | * panic status to the user, let's just see whether | |
1228 | * that's the case. | |
1229 | */ | |
1230 | int err = errno; | |
1231 | if (s->addr) { | |
1232 | plug_log(s->plug, 1, s->addr, s->port, strerror(err), err); | |
1233 | while (s->addr && sk_nextaddr(s->addr, &s->step)) { | |
1234 | err = try_connect(s); | |
1235 | } | |
1236 | } | |
1237 | if (err != 0) | |
1238 | return plug_closing(s->plug, strerror(err), err, 0); | |
1239 | } else if (0 == ret) { | |
1240 | return plug_closing(s->plug, NULL, 0, 0); | |
1241 | } else { | |
1242 | /* | |
1243 | * Receiving actual data on a socket means we can | |
1244 | * stop falling back through the candidate | |
1245 | * addresses to connect to. | |
1246 | */ | |
1247 | if (s->addr) { | |
1248 | sk_addr_free(s->addr); | |
1249 | s->addr = NULL; | |
1250 | } | |
1251 | return plug_receive(s->plug, atmark ? 0 : 1, buf, ret); | |
1252 | } | |
1253 | break; | |
1254 | case 2: /* writable */ | |
1255 | if (!s->connected) { | |
1256 | /* | |
1257 | * select() reports a socket as _writable_ when an | |
1258 | * asynchronous connection is completed. | |
1259 | */ | |
1260 | s->connected = s->writable = 1; | |
1261 | uxsel_tell(s); | |
1262 | break; | |
1263 | } else { | |
1264 | int bufsize_before, bufsize_after; | |
1265 | s->writable = 1; | |
1266 | bufsize_before = s->sending_oob + bufchain_size(&s->output_data); | |
1267 | try_send(s); | |
1268 | bufsize_after = s->sending_oob + bufchain_size(&s->output_data); | |
1269 | if (bufsize_after < bufsize_before) | |
1270 | plug_sent(s->plug, bufsize_after); | |
1271 | } | |
1272 | break; | |
1273 | } | |
1274 | ||
1275 | return 1; | |
1276 | } | |
1277 | ||
1278 | /* | |
1279 | * Deal with socket errors detected in try_send(). | |
1280 | */ | |
1281 | void net_pending_errors(void) | |
1282 | { | |
1283 | int i; | |
1284 | Actual_Socket s; | |
1285 | ||
1286 | /* | |
1287 | * This might be a fiddly business, because it's just possible | |
1288 | * that handling a pending error on one socket might cause | |
1289 | * others to be closed. (I can't think of any reason this might | |
1290 | * happen in current SSH implementation, but to maintain | |
1291 | * generality of this network layer I'll assume the worst.) | |
1292 | * | |
1293 | * So what we'll do is search the socket list for _one_ socket | |
1294 | * with a pending error, and then handle it, and then search | |
1295 | * the list again _from the beginning_. Repeat until we make a | |
1296 | * pass with no socket errors present. That way we are | |
1297 | * protected against the socket list changing under our feet. | |
1298 | */ | |
1299 | ||
1300 | do { | |
1301 | for (i = 0; (s = index234(sktree, i)) != NULL; i++) { | |
1302 | if (s->pending_error) { | |
1303 | /* | |
1304 | * An error has occurred on this socket. Pass it to the | |
1305 | * plug. | |
1306 | */ | |
1307 | plug_closing(s->plug, strerror(s->pending_error), | |
1308 | s->pending_error, 0); | |
1309 | break; | |
1310 | } | |
1311 | } | |
1312 | } while (s); | |
1313 | } | |
1314 | ||
1315 | /* | |
1316 | * Each socket abstraction contains a `void *' private field in | |
1317 | * which the client can keep state. | |
1318 | */ | |
1319 | static void sk_tcp_set_private_ptr(Socket sock, void *ptr) | |
1320 | { | |
1321 | Actual_Socket s = (Actual_Socket) sock; | |
1322 | s->private_ptr = ptr; | |
1323 | } | |
1324 | ||
1325 | static void *sk_tcp_get_private_ptr(Socket sock) | |
1326 | { | |
1327 | Actual_Socket s = (Actual_Socket) sock; | |
1328 | return s->private_ptr; | |
1329 | } | |
1330 | ||
1331 | /* | |
1332 | * Special error values are returned from sk_namelookup and sk_new | |
1333 | * if there's a problem. These functions extract an error message, | |
1334 | * or return NULL if there's no problem. | |
1335 | */ | |
1336 | const char *sk_addr_error(SockAddr addr) | |
1337 | { | |
1338 | return addr->error; | |
1339 | } | |
1340 | static const char *sk_tcp_socket_error(Socket sock) | |
1341 | { | |
1342 | Actual_Socket s = (Actual_Socket) sock; | |
1343 | return s->error; | |
1344 | } | |
1345 | ||
1346 | static void sk_tcp_set_frozen(Socket sock, int is_frozen) | |
1347 | { | |
1348 | Actual_Socket s = (Actual_Socket) sock; | |
1349 | if (s->frozen == is_frozen) | |
1350 | return; | |
1351 | s->frozen = is_frozen; | |
1352 | if (!is_frozen && s->frozen_readable) { | |
1353 | char c; | |
1354 | recv(s->s, &c, 1, MSG_PEEK); | |
1355 | } | |
1356 | s->frozen_readable = 0; | |
1357 | uxsel_tell(s); | |
1358 | } | |
1359 | ||
1360 | static void uxsel_tell(Actual_Socket s) | |
1361 | { | |
1362 | int rwx = 0; | |
1363 | if (s->listener) { | |
1364 | rwx |= 1; /* read == accept */ | |
1365 | } else { | |
1366 | if (!s->connected) | |
1367 | rwx |= 2; /* write == connect */ | |
1368 | if (s->connected && !s->frozen) | |
1369 | rwx |= 1 | 4; /* read, except */ | |
1370 | if (bufchain_size(&s->output_data)) | |
1371 | rwx |= 2; /* write */ | |
1372 | } | |
1373 | uxsel_set(s->s, rwx, net_select_result); | |
1374 | } | |
1375 | ||
1376 | int net_service_lookup(char *service) | |
1377 | { | |
1378 | struct servent *se; | |
1379 | se = getservbyname(service, NULL); | |
1380 | if (se != NULL) | |
1381 | return ntohs(se->s_port); | |
1382 | else | |
1383 | return 0; | |
1384 | } | |
1385 | ||
1386 | char *get_hostname(void) | |
1387 | { | |
1388 | int len = 128; | |
1389 | char *hostname = NULL; | |
1390 | do { | |
1391 | len *= 2; | |
1392 | hostname = sresize(hostname, len, char); | |
1393 | if ((gethostname(hostname, len) < 0) && | |
1394 | (errno != ENAMETOOLONG)) { | |
1395 | sfree(hostname); | |
1396 | hostname = NULL; | |
1397 | break; | |
1398 | } | |
1399 | } while (strlen(hostname) >= len-1); | |
1400 | return hostname; | |
1401 | } | |
1402 | ||
1403 | SockAddr platform_get_x11_unix_address(const char *sockpath, int displaynum) | |
1404 | { | |
1405 | SockAddr ret = snew(struct SockAddr_tag); | |
1406 | int n; | |
1407 | ||
1408 | memset(ret, 0, sizeof *ret); | |
1409 | ret->superfamily = UNIX; | |
1410 | /* | |
1411 | * In special circumstances (notably Mac OS X Leopard), we'll | |
1412 | * have been passed an explicit Unix socket path. | |
1413 | */ | |
1414 | if (sockpath) { | |
1415 | n = snprintf(ret->hostname, sizeof ret->hostname, | |
1416 | "%s", sockpath); | |
1417 | } else { | |
1418 | n = snprintf(ret->hostname, sizeof ret->hostname, | |
1419 | "%s%d", X11_UNIX_PATH, displaynum); | |
1420 | } | |
1421 | ||
1422 | if (n < 0) | |
1423 | ret->error = "snprintf failed"; | |
1424 | else if (n >= sizeof ret->hostname) | |
1425 | ret->error = "X11 UNIX name too long"; | |
1426 | ||
1427 | #ifndef NO_IPV6 | |
1428 | ret->ais = NULL; | |
1429 | #else | |
1430 | ret->addresses = NULL; | |
1431 | ret->naddresses = 0; | |
1432 | #endif | |
1433 | ret->refcount = 1; | |
1434 | return ret; | |
1435 | } |