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 | |
dbf58cfa |
25 | /* Solaris needs <sys/sockio.h> for SIOCATMARK. */ |
5f86b177 |
26 | #ifndef SIOCATMARK |
dbf58cfa |
27 | #include <sys/sockio.h> |
28 | #endif |
29 | |
fc0f17db |
30 | #ifndef X11_UNIX_PATH |
31 | # define X11_UNIX_PATH "/tmp/.X11-unix/X" |
32 | #endif |
33 | |
c44e5afc |
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; |
23e649c9 |
46 | struct sockaddr_un su; |
c44e5afc |
47 | }; |
48 | |
4efd5997 |
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 | |
facf7568 |
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 | |
c5e438ec |
72 | struct Socket_tag { |
73 | struct socket_function_table *fn; |
74 | /* the above variable absolutely *must* be the first in this structure */ |
cbe2d68f |
75 | const char *error; |
c5e438ec |
76 | int s; |
77 | Plug plug; |
78 | void *private_ptr; |
79 | bufchain output_data; |
1cfc764f |
80 | int connected; /* irrelevant for listening sockets */ |
c5e438ec |
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; |
bc06669b |
90 | enum { EOF_NO, EOF_PENDING, EOF_SENT } outgoingeof; |
91 | int incomingeof; |
c5e438ec |
92 | int pending_error; /* in case send() returns error */ |
93 | int listener; |
7555d6a5 |
94 | int nodelay, keepalive; /* for connect()-type sockets */ |
95 | int privport, port; /* and again */ |
96 | SockAddr addr; |
facf7568 |
97 | SockAddrStep step; |
4efd5997 |
98 | /* |
99 | * We sometimes need pairs of Socket structures to be linked: |
100 | * if we are listening on the same IPv6 and v4 port, for |
101 | * example. So here we define `parent' and `child' pointers to |
102 | * track this link. |
103 | */ |
104 | Actual_Socket parent, child; |
c5e438ec |
105 | }; |
106 | |
c5e438ec |
107 | struct SockAddr_tag { |
5025a993 |
108 | int refcount; |
cbe2d68f |
109 | const char *error; |
facf7568 |
110 | enum { UNRESOLVED, UNIX, IP } superfamily; |
05581745 |
111 | #ifndef NO_IPV6 |
7555d6a5 |
112 | struct addrinfo *ais; /* Addresses IPv6 style. */ |
792c5eb5 |
113 | #else |
7555d6a5 |
114 | unsigned long *addresses; /* Addresses IPv4 style. */ |
facf7568 |
115 | int naddresses; |
c5e438ec |
116 | #endif |
b7a189f3 |
117 | char hostname[512]; /* Store an unresolved host name. */ |
c5e438ec |
118 | }; |
119 | |
facf7568 |
120 | /* |
121 | * Which address family this address belongs to. AF_INET for IPv4; |
122 | * AF_INET6 for IPv6; AF_UNSPEC indicates that name resolution has |
123 | * not been done and a simple host name is held in this SockAddr |
124 | * structure. |
125 | */ |
126 | #ifndef NO_IPV6 |
127 | #define SOCKADDR_FAMILY(addr, step) \ |
128 | ((addr)->superfamily == UNRESOLVED ? AF_UNSPEC : \ |
129 | (addr)->superfamily == UNIX ? AF_UNIX : \ |
130 | (step).ai ? (step).ai->ai_family : AF_INET) |
131 | #else |
132 | #define SOCKADDR_FAMILY(addr, step) \ |
133 | ((addr)->superfamily == UNRESOLVED ? AF_UNSPEC : \ |
134 | (addr)->superfamily == UNIX ? AF_UNIX : AF_INET) |
135 | #endif |
136 | |
137 | /* |
138 | * Start a SockAddrStep structure to step through multiple |
139 | * addresses. |
140 | */ |
141 | #ifndef NO_IPV6 |
142 | #define START_STEP(addr, step) \ |
143 | ((step).ai = (addr)->ais, (step).curraddr = 0) |
144 | #else |
145 | #define START_STEP(addr, step) \ |
146 | ((step).curraddr = 0) |
147 | #endif |
148 | |
c5e438ec |
149 | static tree234 *sktree; |
150 | |
0ff9ea38 |
151 | static void uxsel_tell(Actual_Socket s); |
152 | |
c5e438ec |
153 | static int cmpfortree(void *av, void *bv) |
154 | { |
155 | Actual_Socket a = (Actual_Socket) av, b = (Actual_Socket) bv; |
156 | int as = a->s, bs = b->s; |
157 | if (as < bs) |
158 | return -1; |
159 | if (as > bs) |
160 | return +1; |
fef4049e |
161 | if (a < b) |
162 | return -1; |
163 | if (a > b) |
164 | return +1; |
c5e438ec |
165 | return 0; |
166 | } |
167 | |
168 | static int cmpforsearch(void *av, void *bv) |
169 | { |
170 | Actual_Socket b = (Actual_Socket) bv; |
f7f9fb5c |
171 | int as = *(int *)av, bs = b->s; |
c5e438ec |
172 | if (as < bs) |
173 | return -1; |
174 | if (as > bs) |
175 | return +1; |
176 | return 0; |
177 | } |
178 | |
179 | void sk_init(void) |
180 | { |
181 | sktree = newtree234(cmpfortree); |
182 | } |
183 | |
184 | void sk_cleanup(void) |
185 | { |
186 | Actual_Socket s; |
187 | int i; |
188 | |
189 | if (sktree) { |
190 | for (i = 0; (s = index234(sktree, i)) != NULL; i++) { |
191 | close(s->s); |
192 | } |
193 | } |
194 | } |
195 | |
05581745 |
196 | SockAddr sk_namelookup(const char *host, char **canonicalname, int address_family) |
c5e438ec |
197 | { |
3d88e64d |
198 | SockAddr ret = snew(struct SockAddr_tag); |
05581745 |
199 | #ifndef NO_IPV6 |
792c5eb5 |
200 | struct addrinfo hints; |
201 | int err; |
202 | #else |
c5e438ec |
203 | unsigned long a; |
204 | struct hostent *h = NULL; |
7555d6a5 |
205 | int n; |
792c5eb5 |
206 | #endif |
c5e438ec |
207 | char realhost[8192]; |
208 | |
209 | /* Clear the structure and default to IPv4. */ |
210 | memset(ret, 0, sizeof(struct SockAddr_tag)); |
facf7568 |
211 | ret->superfamily = UNRESOLVED; |
c5e438ec |
212 | *realhost = '\0'; |
213 | ret->error = NULL; |
5025a993 |
214 | ret->refcount = 1; |
c5e438ec |
215 | |
05581745 |
216 | #ifndef NO_IPV6 |
792c5eb5 |
217 | hints.ai_flags = AI_CANONNAME; |
81b34354 |
218 | hints.ai_family = (address_family == ADDRTYPE_IPV4 ? AF_INET : |
219 | address_family == ADDRTYPE_IPV6 ? AF_INET6 : |
220 | AF_UNSPEC); |
221 | hints.ai_socktype = SOCK_STREAM; |
792c5eb5 |
222 | hints.ai_protocol = 0; |
223 | hints.ai_addrlen = 0; |
224 | hints.ai_addr = NULL; |
225 | hints.ai_canonname = NULL; |
226 | hints.ai_next = NULL; |
7555d6a5 |
227 | err = getaddrinfo(host, NULL, &hints, &ret->ais); |
792c5eb5 |
228 | if (err != 0) { |
229 | ret->error = gai_strerror(err); |
230 | return ret; |
231 | } |
facf7568 |
232 | ret->superfamily = IP; |
792c5eb5 |
233 | *realhost = '\0'; |
facf7568 |
234 | if (ret->ais->ai_canonname != NULL) |
235 | strncat(realhost, ret->ais->ai_canonname, sizeof(realhost) - 1); |
792c5eb5 |
236 | else |
237 | strncat(realhost, host, sizeof(realhost) - 1); |
238 | #else |
72e22079 |
239 | if ((a = inet_addr(host)) == (unsigned long)(in_addr_t)(-1)) { |
792c5eb5 |
240 | /* |
241 | * Otherwise use the IPv4-only gethostbyname... (NOTE: |
242 | * we don't use gethostbyname as a fallback!) |
243 | */ |
facf7568 |
244 | if (ret->superfamily == UNRESOLVED) { |
7555d6a5 |
245 | /*debug(("Resolving \"%s\" with gethostbyname() (IPv4 only)...\n", host)); */ |
246 | if ( (h = gethostbyname(host)) ) |
facf7568 |
247 | ret->superfamily = IP; |
792c5eb5 |
248 | } |
facf7568 |
249 | if (ret->superfamily == UNRESOLVED) { |
7555d6a5 |
250 | ret->error = (h_errno == HOST_NOT_FOUND || |
251 | h_errno == NO_DATA || |
252 | h_errno == NO_ADDRESS ? "Host does not exist" : |
253 | h_errno == TRY_AGAIN ? |
254 | "Temporary name service failure" : |
255 | "gethostbyname: unknown error"); |
256 | return ret; |
c5e438ec |
257 | } |
792c5eb5 |
258 | /* This way we are always sure the h->h_name is valid :) */ |
259 | strncpy(realhost, h->h_name, sizeof(realhost)); |
7555d6a5 |
260 | for (n = 0; h->h_addr_list[n]; n++); |
261 | ret->addresses = snewn(n, unsigned long); |
262 | ret->naddresses = n; |
263 | for (n = 0; n < ret->naddresses; n++) { |
264 | memcpy(&a, h->h_addr_list[n], sizeof(a)); |
265 | ret->addresses[n] = ntohl(a); |
266 | } |
c5e438ec |
267 | } else { |
268 | /* |
269 | * This must be a numeric IPv4 address because it caused a |
270 | * success return from inet_addr. |
271 | */ |
facf7568 |
272 | ret->superfamily = IP; |
c5e438ec |
273 | strncpy(realhost, host, sizeof(realhost)); |
7555d6a5 |
274 | ret->addresses = snew(unsigned long); |
275 | ret->naddresses = 1; |
276 | ret->addresses[0] = ntohl(a); |
c5e438ec |
277 | } |
792c5eb5 |
278 | #endif |
c5e438ec |
279 | realhost[lenof(realhost)-1] = '\0'; |
3d88e64d |
280 | *canonicalname = snewn(1+strlen(realhost), char); |
c5e438ec |
281 | strcpy(*canonicalname, realhost); |
282 | return ret; |
283 | } |
284 | |
e8fa8f62 |
285 | SockAddr sk_nonamelookup(const char *host) |
b7a189f3 |
286 | { |
3d88e64d |
287 | SockAddr ret = snew(struct SockAddr_tag); |
ab0873ab |
288 | ret->error = NULL; |
facf7568 |
289 | ret->superfamily = UNRESOLVED; |
b7a189f3 |
290 | strncpy(ret->hostname, host, lenof(ret->hostname)); |
291 | ret->hostname[lenof(ret->hostname)-1] = '\0'; |
e14d27a1 |
292 | #ifndef NO_IPV6 |
7555d6a5 |
293 | ret->ais = NULL; |
294 | #else |
295 | ret->addresses = NULL; |
e14d27a1 |
296 | #endif |
5025a993 |
297 | ret->refcount = 1; |
b7a189f3 |
298 | return ret; |
299 | } |
300 | |
facf7568 |
301 | static int sk_nextaddr(SockAddr addr, SockAddrStep *step) |
7555d6a5 |
302 | { |
303 | #ifndef NO_IPV6 |
facf7568 |
304 | if (step->ai && step->ai->ai_next) { |
305 | step->ai = step->ai->ai_next; |
7555d6a5 |
306 | return TRUE; |
307 | } else |
308 | return FALSE; |
309 | #else |
facf7568 |
310 | if (step->curraddr+1 < addr->naddresses) { |
311 | step->curraddr++; |
7555d6a5 |
312 | return TRUE; |
313 | } else { |
314 | return FALSE; |
315 | } |
316 | #endif |
317 | } |
318 | |
c5e438ec |
319 | void sk_getaddr(SockAddr addr, char *buf, int buflen) |
320 | { |
ffbfd093 |
321 | /* XXX not clear what we should return for Unix-domain sockets; let's |
322 | * hope the question never arises */ |
323 | assert(addr->superfamily != UNIX); |
facf7568 |
324 | if (addr->superfamily == UNRESOLVED) { |
792c5eb5 |
325 | strncpy(buf, addr->hostname, buflen); |
326 | buf[buflen-1] = '\0'; |
327 | } else { |
05581745 |
328 | #ifndef NO_IPV6 |
facf7568 |
329 | if (getnameinfo(addr->ais->ai_addr, addr->ais->ai_addrlen, buf, buflen, |
792c5eb5 |
330 | NULL, 0, NI_NUMERICHOST) != 0) { |
331 | buf[0] = '\0'; |
332 | strncat(buf, "<unknown>", buflen - 1); |
333 | } |
334 | #else |
c5e438ec |
335 | struct in_addr a; |
facf7568 |
336 | SockAddrStep step; |
337 | START_STEP(addr, step); |
338 | assert(SOCKADDR_FAMILY(addr, step) == AF_INET); |
339 | a.s_addr = htonl(addr->addresses[0]); |
c5e438ec |
340 | strncpy(buf, inet_ntoa(a), buflen); |
b7a189f3 |
341 | buf[buflen-1] = '\0'; |
792c5eb5 |
342 | #endif |
c5e438ec |
343 | } |
c5e438ec |
344 | } |
345 | |
b804e1e5 |
346 | int sk_hostname_is_local(char *name) |
347 | { |
db74a69d |
348 | return !strcmp(name, "localhost") || |
349 | !strcmp(name, "::1") || |
350 | !strncmp(name, "127.", 4); |
b804e1e5 |
351 | } |
352 | |
147d3370 |
353 | #define ipv4_is_loopback(addr) \ |
354 | (((addr).s_addr & htonl(0xff000000)) == htonl(0x7f000000)) |
355 | |
356 | static int sockaddr_is_loopback(struct sockaddr *sa) |
357 | { |
c44e5afc |
358 | union sockaddr_union *u = (union sockaddr_union *)sa; |
359 | switch (u->sa.sa_family) { |
147d3370 |
360 | case AF_INET: |
c44e5afc |
361 | return ipv4_is_loopback(u->sin.sin_addr); |
147d3370 |
362 | #ifndef NO_IPV6 |
363 | case AF_INET6: |
c44e5afc |
364 | return IN6_IS_ADDR_LOOPBACK(&u->sin6.sin6_addr); |
147d3370 |
365 | #endif |
ff677091 |
366 | case AF_UNIX: |
147d3370 |
367 | return TRUE; |
368 | default: |
369 | return FALSE; |
370 | } |
371 | } |
372 | |
b804e1e5 |
373 | int sk_address_is_local(SockAddr addr) |
374 | { |
facf7568 |
375 | if (addr->superfamily == UNRESOLVED) |
792c5eb5 |
376 | return 0; /* we don't know; assume not */ |
ffbfd093 |
377 | else if (addr->superfamily == UNIX) |
378 | return 1; |
792c5eb5 |
379 | else { |
05581745 |
380 | #ifndef NO_IPV6 |
facf7568 |
381 | return sockaddr_is_loopback(addr->ais->ai_addr); |
792c5eb5 |
382 | #else |
b804e1e5 |
383 | struct in_addr a; |
facf7568 |
384 | SockAddrStep step; |
385 | START_STEP(addr, step); |
386 | assert(SOCKADDR_FAMILY(addr, step) == AF_INET); |
387 | a.s_addr = htonl(addr->addresses[0]); |
b804e1e5 |
388 | return ipv4_is_loopback(a); |
792c5eb5 |
389 | #endif |
b804e1e5 |
390 | } |
b804e1e5 |
391 | } |
392 | |
46f25814 |
393 | int sk_address_is_special_local(SockAddr addr) |
394 | { |
395 | return addr->superfamily == UNIX; |
396 | } |
397 | |
c5e438ec |
398 | int sk_addrtype(SockAddr addr) |
399 | { |
facf7568 |
400 | SockAddrStep step; |
401 | int family; |
402 | START_STEP(addr, step); |
403 | family = SOCKADDR_FAMILY(addr, step); |
404 | |
405 | return (family == AF_INET ? ADDRTYPE_IPV4 : |
05581745 |
406 | #ifndef NO_IPV6 |
facf7568 |
407 | family == AF_INET6 ? ADDRTYPE_IPV6 : |
b7a189f3 |
408 | #endif |
409 | ADDRTYPE_NAME); |
c5e438ec |
410 | } |
411 | |
412 | void sk_addrcopy(SockAddr addr, char *buf) |
413 | { |
facf7568 |
414 | SockAddrStep step; |
415 | int family; |
416 | START_STEP(addr, step); |
417 | family = SOCKADDR_FAMILY(addr, step); |
792c5eb5 |
418 | |
05581745 |
419 | #ifndef NO_IPV6 |
facf7568 |
420 | if (family == AF_INET) |
421 | memcpy(buf, &((struct sockaddr_in *)step.ai->ai_addr)->sin_addr, |
792c5eb5 |
422 | sizeof(struct in_addr)); |
facf7568 |
423 | else if (family == AF_INET6) |
424 | memcpy(buf, &((struct sockaddr_in6 *)step.ai->ai_addr)->sin6_addr, |
792c5eb5 |
425 | sizeof(struct in6_addr)); |
426 | else |
427 | assert(FALSE); |
428 | #else |
429 | struct in_addr a; |
430 | |
facf7568 |
431 | assert(family == AF_INET); |
432 | a.s_addr = htonl(addr->addresses[step.curraddr]); |
792c5eb5 |
433 | memcpy(buf, (char*) &a.s_addr, 4); |
c5e438ec |
434 | #endif |
c5e438ec |
435 | } |
436 | |
437 | void sk_addr_free(SockAddr addr) |
438 | { |
5025a993 |
439 | if (--addr->refcount > 0) |
440 | return; |
05581745 |
441 | #ifndef NO_IPV6 |
7555d6a5 |
442 | if (addr->ais != NULL) |
443 | freeaddrinfo(addr->ais); |
444 | #else |
445 | sfree(addr->addresses); |
792c5eb5 |
446 | #endif |
c5e438ec |
447 | sfree(addr); |
448 | } |
449 | |
5025a993 |
450 | SockAddr sk_addr_dup(SockAddr addr) |
451 | { |
452 | addr->refcount++; |
453 | return addr; |
454 | } |
455 | |
c5e438ec |
456 | static Plug sk_tcp_plug(Socket sock, Plug p) |
457 | { |
458 | Actual_Socket s = (Actual_Socket) sock; |
459 | Plug ret = s->plug; |
460 | if (p) |
461 | s->plug = p; |
462 | return ret; |
463 | } |
464 | |
465 | static void sk_tcp_flush(Socket s) |
466 | { |
467 | /* |
468 | * We send data to the socket as soon as we can anyway, |
469 | * so we don't need to do anything here. :-) |
470 | */ |
471 | } |
472 | |
473 | static void sk_tcp_close(Socket s); |
e0e7dff8 |
474 | static int sk_tcp_write(Socket s, const char *data, int len); |
475 | static int sk_tcp_write_oob(Socket s, const char *data, int len); |
bc06669b |
476 | static void sk_tcp_write_eof(Socket s); |
c5e438ec |
477 | static void sk_tcp_set_private_ptr(Socket s, void *ptr); |
478 | static void *sk_tcp_get_private_ptr(Socket s); |
479 | static void sk_tcp_set_frozen(Socket s, int is_frozen); |
cbe2d68f |
480 | static const char *sk_tcp_socket_error(Socket s); |
c5e438ec |
481 | |
2f92b717 |
482 | static struct socket_function_table tcp_fn_table = { |
483 | sk_tcp_plug, |
484 | sk_tcp_close, |
485 | sk_tcp_write, |
486 | sk_tcp_write_oob, |
bc06669b |
487 | sk_tcp_write_eof, |
2f92b717 |
488 | sk_tcp_flush, |
489 | sk_tcp_set_private_ptr, |
490 | sk_tcp_get_private_ptr, |
491 | sk_tcp_set_frozen, |
492 | sk_tcp_socket_error |
493 | }; |
494 | |
f7f9fb5c |
495 | Socket sk_register(OSSocket sockfd, Plug plug) |
c5e438ec |
496 | { |
c5e438ec |
497 | Actual_Socket ret; |
498 | |
499 | /* |
500 | * Create Socket structure. |
501 | */ |
3d88e64d |
502 | ret = snew(struct Socket_tag); |
2f92b717 |
503 | ret->fn = &tcp_fn_table; |
c5e438ec |
504 | ret->error = NULL; |
505 | ret->plug = plug; |
506 | bufchain_init(&ret->output_data); |
507 | ret->writable = 1; /* to start with */ |
508 | ret->sending_oob = 0; |
509 | ret->frozen = 1; |
510 | ret->frozen_readable = 0; |
511 | ret->localhost_only = 0; /* unused, but best init anyway */ |
512 | ret->pending_error = 0; |
513 | ret->oobpending = FALSE; |
bc06669b |
514 | ret->outgoingeof = EOF_NO; |
515 | ret->incomingeof = FALSE; |
c5e438ec |
516 | ret->listener = 0; |
4efd5997 |
517 | ret->parent = ret->child = NULL; |
7555d6a5 |
518 | ret->addr = NULL; |
a8cb2b6e |
519 | ret->connected = 1; |
c5e438ec |
520 | |
f7f9fb5c |
521 | ret->s = sockfd; |
c5e438ec |
522 | |
523 | if (ret->s < 0) { |
7555d6a5 |
524 | ret->error = strerror(errno); |
c5e438ec |
525 | return (Socket) ret; |
526 | } |
527 | |
528 | ret->oobinline = 0; |
529 | |
0ff9ea38 |
530 | uxsel_tell(ret); |
c5e438ec |
531 | add234(sktree, ret); |
532 | |
533 | return (Socket) ret; |
534 | } |
535 | |
7555d6a5 |
536 | static int try_connect(Actual_Socket sock) |
c5e438ec |
537 | { |
c5e438ec |
538 | int s; |
23e649c9 |
539 | union sockaddr_union u; |
540 | const union sockaddr_union *sa; |
7555d6a5 |
541 | int err = 0; |
c5e438ec |
542 | short localport; |
facf7568 |
543 | int fl, salen, family; |
c5e438ec |
544 | |
fef4049e |
545 | /* |
546 | * Remove the socket from the tree before we overwrite its |
547 | * internal socket id, because that forms part of the tree's |
548 | * sorting criterion. We'll add it back before exiting this |
549 | * function, whether we changed anything or not. |
550 | */ |
551 | del234(sktree, sock); |
552 | |
7555d6a5 |
553 | if (sock->s >= 0) |
554 | close(sock->s); |
555 | |
556 | plug_log(sock->plug, 0, sock->addr, sock->port, NULL, 0); |
c5e438ec |
557 | |
558 | /* |
559 | * Open socket. |
560 | */ |
facf7568 |
561 | family = SOCKADDR_FAMILY(sock->addr, sock->step); |
562 | assert(family != AF_UNSPEC); |
563 | s = socket(family, SOCK_STREAM, 0); |
7555d6a5 |
564 | sock->s = s; |
c5e438ec |
565 | |
566 | if (s < 0) { |
7555d6a5 |
567 | err = errno; |
568 | goto ret; |
c5e438ec |
569 | } |
570 | |
db9b7dce |
571 | cloexec(s); |
89e97516 |
572 | |
7555d6a5 |
573 | if (sock->oobinline) { |
c5e438ec |
574 | int b = TRUE; |
575 | setsockopt(s, SOL_SOCKET, SO_OOBINLINE, (void *) &b, sizeof(b)); |
576 | } |
577 | |
7555d6a5 |
578 | if (sock->nodelay) { |
c5e438ec |
579 | int b = TRUE; |
580 | setsockopt(s, IPPROTO_TCP, TCP_NODELAY, (void *) &b, sizeof(b)); |
581 | } |
582 | |
7555d6a5 |
583 | if (sock->keepalive) { |
79bf227b |
584 | int b = TRUE; |
585 | setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, (void *) &b, sizeof(b)); |
586 | } |
587 | |
c5e438ec |
588 | /* |
589 | * Bind to local address. |
590 | */ |
7555d6a5 |
591 | if (sock->privport) |
c5e438ec |
592 | localport = 1023; /* count from 1023 downwards */ |
593 | else |
594 | localport = 0; /* just use port 0 (ie kernel picks) */ |
595 | |
d2c29274 |
596 | /* BSD IP stacks need sockaddr_in zeroed before filling in */ |
23e649c9 |
597 | memset(&u,'\0',sizeof(u)); |
fc0f17db |
598 | |
599 | /* We don't try to bind to a local address for UNIX domain sockets. (Why |
600 | * do we bother doing the bind when localport == 0 anyway?) */ |
facf7568 |
601 | if (family != AF_UNIX) { |
fc0f17db |
602 | /* Loop round trying to bind */ |
603 | while (1) { |
604 | int retcode; |
c5e438ec |
605 | |
05581745 |
606 | #ifndef NO_IPV6 |
facf7568 |
607 | if (family == AF_INET6) { |
fc0f17db |
608 | /* XXX use getaddrinfo to get a local address? */ |
23e649c9 |
609 | u.sin6.sin6_family = AF_INET6; |
610 | u.sin6.sin6_addr = in6addr_any; |
611 | u.sin6.sin6_port = htons(localport); |
612 | retcode = bind(s, &u.sa, sizeof(u.sin6)); |
fc0f17db |
613 | } else |
c5e438ec |
614 | #endif |
fc0f17db |
615 | { |
facf7568 |
616 | assert(family == AF_INET); |
23e649c9 |
617 | u.sin.sin_family = AF_INET; |
618 | u.sin.sin_addr.s_addr = htonl(INADDR_ANY); |
619 | u.sin.sin_port = htons(localport); |
620 | retcode = bind(s, &u.sa, sizeof(u.sin)); |
fc0f17db |
621 | } |
622 | if (retcode >= 0) { |
623 | err = 0; |
624 | break; /* done */ |
625 | } else { |
626 | err = errno; |
627 | if (err != EADDRINUSE) /* failed, for a bad reason */ |
628 | break; |
629 | } |
630 | |
631 | if (localport == 0) |
632 | break; /* we're only looping once */ |
633 | localport--; |
634 | if (localport == 0) |
635 | break; /* we might have got to the end */ |
c5e438ec |
636 | } |
fc0f17db |
637 | |
7555d6a5 |
638 | if (err) |
639 | goto ret; |
c5e438ec |
640 | } |
641 | |
642 | /* |
643 | * Connect to remote address. |
644 | */ |
facf7568 |
645 | switch(family) { |
05581745 |
646 | #ifndef NO_IPV6 |
fc0f17db |
647 | case AF_INET: |
648 | /* XXX would be better to have got getaddrinfo() to fill in the port. */ |
facf7568 |
649 | ((struct sockaddr_in *)sock->step.ai->ai_addr)->sin_port = |
7555d6a5 |
650 | htons(sock->port); |
23e649c9 |
651 | sa = (const union sockaddr_union *)sock->step.ai->ai_addr; |
facf7568 |
652 | salen = sock->step.ai->ai_addrlen; |
fc0f17db |
653 | break; |
654 | case AF_INET6: |
facf7568 |
655 | ((struct sockaddr_in *)sock->step.ai->ai_addr)->sin_port = |
7555d6a5 |
656 | htons(sock->port); |
23e649c9 |
657 | sa = (const union sockaddr_union *)sock->step.ai->ai_addr; |
facf7568 |
658 | salen = sock->step.ai->ai_addrlen; |
fc0f17db |
659 | break; |
792c5eb5 |
660 | #else |
fc0f17db |
661 | case AF_INET: |
23e649c9 |
662 | u.sin.sin_family = AF_INET; |
663 | u.sin.sin_addr.s_addr = htonl(sock->addr->addresses[sock->step.curraddr]); |
664 | u.sin.sin_port = htons((short) sock->port); |
665 | sa = &u; |
666 | salen = sizeof u.sin; |
fc0f17db |
667 | break; |
792c5eb5 |
668 | #endif |
fc0f17db |
669 | case AF_UNIX: |
7555d6a5 |
670 | assert(sock->port == 0); /* to catch confused people */ |
23e649c9 |
671 | assert(strlen(sock->addr->hostname) < sizeof u.su.sun_path); |
672 | u.su.sun_family = AF_UNIX; |
673 | strcpy(u.su.sun_path, sock->addr->hostname); |
674 | sa = &u; |
675 | salen = sizeof u.su; |
fc0f17db |
676 | break; |
677 | |
678 | default: |
679 | assert(0 && "unknown address family"); |
8815b68b |
680 | exit(1); /* XXX: GCC doesn't understand assert() on some systems. */ |
fc0f17db |
681 | } |
4b70e70e |
682 | |
683 | fl = fcntl(s, F_GETFL); |
684 | if (fl != -1) |
685 | fcntl(s, F_SETFL, fl | O_NONBLOCK); |
051dd789 |
686 | |
23e649c9 |
687 | if ((connect(s, &(sa->sa), salen)) < 0) { |
051dd789 |
688 | if ( errno != EINPROGRESS ) { |
7555d6a5 |
689 | err = errno; |
690 | goto ret; |
c5e438ec |
691 | } |
692 | } else { |
693 | /* |
694 | * If we _don't_ get EWOULDBLOCK, the connect has completed |
695 | * and we should set the socket as connected and writable. |
696 | */ |
7555d6a5 |
697 | sock->connected = 1; |
698 | sock->writable = 1; |
c5e438ec |
699 | } |
700 | |
7555d6a5 |
701 | uxsel_tell(sock); |
7555d6a5 |
702 | |
703 | ret: |
fef4049e |
704 | |
705 | /* |
706 | * No matter what happened, put the socket back in the tree. |
707 | */ |
708 | add234(sktree, sock); |
709 | |
7555d6a5 |
710 | if (err) |
711 | plug_log(sock->plug, 1, sock->addr, sock->port, strerror(err), err); |
712 | return err; |
713 | } |
714 | |
715 | Socket sk_new(SockAddr addr, int port, int privport, int oobinline, |
716 | int nodelay, int keepalive, Plug plug) |
717 | { |
718 | Actual_Socket ret; |
719 | int err; |
720 | |
721 | /* |
722 | * Create Socket structure. |
723 | */ |
724 | ret = snew(struct Socket_tag); |
725 | ret->fn = &tcp_fn_table; |
726 | ret->error = NULL; |
727 | ret->plug = plug; |
728 | bufchain_init(&ret->output_data); |
729 | ret->connected = 0; /* to start with */ |
730 | ret->writable = 0; /* to start with */ |
731 | ret->sending_oob = 0; |
732 | ret->frozen = 0; |
733 | ret->frozen_readable = 0; |
734 | ret->localhost_only = 0; /* unused, but best init anyway */ |
735 | ret->pending_error = 0; |
4efd5997 |
736 | ret->parent = ret->child = NULL; |
7555d6a5 |
737 | ret->oobpending = FALSE; |
bc06669b |
738 | ret->outgoingeof = EOF_NO; |
739 | ret->incomingeof = FALSE; |
7555d6a5 |
740 | ret->listener = 0; |
741 | ret->addr = addr; |
facf7568 |
742 | START_STEP(ret->addr, ret->step); |
7555d6a5 |
743 | ret->s = -1; |
744 | ret->oobinline = oobinline; |
745 | ret->nodelay = nodelay; |
746 | ret->keepalive = keepalive; |
747 | ret->privport = privport; |
748 | ret->port = port; |
749 | |
750 | err = 0; |
751 | do { |
752 | err = try_connect(ret); |
facf7568 |
753 | } while (err && sk_nextaddr(ret->addr, &ret->step)); |
c5e438ec |
754 | |
7555d6a5 |
755 | if (err) |
756 | ret->error = strerror(err); |
f85e6f6e |
757 | |
c5e438ec |
758 | return (Socket) ret; |
759 | } |
760 | |
4efd5997 |
761 | Socket sk_newlistener(char *srcaddr, int port, Plug plug, int local_host_only, int orig_address_family) |
c5e438ec |
762 | { |
c5e438ec |
763 | int s; |
05581745 |
764 | #ifndef NO_IPV6 |
792c5eb5 |
765 | struct addrinfo hints, *ai; |
766 | char portstr[6]; |
767 | #endif |
23e649c9 |
768 | union sockaddr_union u; |
769 | union sockaddr_union *addr; |
adb18b94 |
770 | int addrlen; |
c5e438ec |
771 | Actual_Socket ret; |
772 | int retcode; |
4efd5997 |
773 | int address_family; |
c5e438ec |
774 | int on = 1; |
775 | |
776 | /* |
777 | * Create Socket structure. |
778 | */ |
3d88e64d |
779 | ret = snew(struct Socket_tag); |
2f92b717 |
780 | ret->fn = &tcp_fn_table; |
c5e438ec |
781 | ret->error = NULL; |
782 | ret->plug = plug; |
783 | bufchain_init(&ret->output_data); |
784 | ret->writable = 0; /* to start with */ |
785 | ret->sending_oob = 0; |
786 | ret->frozen = 0; |
787 | ret->frozen_readable = 0; |
788 | ret->localhost_only = local_host_only; |
789 | ret->pending_error = 0; |
4efd5997 |
790 | ret->parent = ret->child = NULL; |
c5e438ec |
791 | ret->oobpending = FALSE; |
bc06669b |
792 | ret->outgoingeof = EOF_NO; |
793 | ret->incomingeof = FALSE; |
c5e438ec |
794 | ret->listener = 1; |
7555d6a5 |
795 | ret->addr = NULL; |
c5e438ec |
796 | |
797 | /* |
05581745 |
798 | * Translate address_family from platform-independent constants |
799 | * into local reality. |
800 | */ |
4efd5997 |
801 | address_family = (orig_address_family == ADDRTYPE_IPV4 ? AF_INET : |
40040af1 |
802 | #ifndef NO_IPV6 |
4efd5997 |
803 | orig_address_family == ADDRTYPE_IPV6 ? AF_INET6 : |
40040af1 |
804 | #endif |
805 | AF_UNSPEC); |
05581745 |
806 | |
807 | #ifndef NO_IPV6 |
808 | /* Let's default to IPv6. |
809 | * If the stack doesn't support IPv6, we will fall back to IPv4. */ |
810 | if (address_family == AF_UNSPEC) address_family = AF_INET6; |
811 | #else |
812 | /* No other choice, default to IPv4 */ |
813 | if (address_family == AF_UNSPEC) address_family = AF_INET; |
814 | #endif |
815 | |
816 | /* |
c5e438ec |
817 | * Open socket. |
818 | */ |
05581745 |
819 | s = socket(address_family, SOCK_STREAM, 0); |
820 | |
40040af1 |
821 | #ifndef NO_IPV6 |
05581745 |
822 | /* If the host doesn't support IPv6 try fallback to IPv4. */ |
823 | if (s < 0 && address_family == AF_INET6) { |
824 | address_family = AF_INET; |
825 | s = socket(address_family, SOCK_STREAM, 0); |
826 | } |
40040af1 |
827 | #endif |
c5e438ec |
828 | |
829 | if (s < 0) { |
7555d6a5 |
830 | ret->error = strerror(errno); |
c5e438ec |
831 | return (Socket) ret; |
832 | } |
833 | |
db9b7dce |
834 | cloexec(s); |
89e97516 |
835 | |
c5e438ec |
836 | ret->oobinline = 0; |
837 | |
838 | setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (const char *)&on, sizeof(on)); |
839 | |
adb18b94 |
840 | retcode = -1; |
841 | addr = NULL; addrlen = -1; /* placate optimiser */ |
842 | |
843 | if (srcaddr != NULL) { |
05581745 |
844 | #ifndef NO_IPV6 |
adb18b94 |
845 | hints.ai_flags = AI_NUMERICHOST; |
846 | hints.ai_family = address_family; |
d5474756 |
847 | hints.ai_socktype = SOCK_STREAM; |
adb18b94 |
848 | hints.ai_protocol = 0; |
849 | hints.ai_addrlen = 0; |
850 | hints.ai_addr = NULL; |
851 | hints.ai_canonname = NULL; |
852 | hints.ai_next = NULL; |
062af27b |
853 | assert(port >= 0 && port <= 99999); |
adb18b94 |
854 | sprintf(portstr, "%d", port); |
855 | retcode = getaddrinfo(srcaddr, portstr, &hints, &ai); |
7f8c817c |
856 | if (retcode == 0) { |
23e649c9 |
857 | addr = (union sockaddr_union *)ai->ai_addr; |
ca9892ae |
858 | addrlen = ai->ai_addrlen; |
859 | } |
adb18b94 |
860 | #else |
23e649c9 |
861 | memset(&u,'\0',sizeof u); |
862 | u.sin.sin_family = AF_INET; |
863 | u.sin.sin_port = htons(port); |
864 | u.sin.sin_addr.s_addr = inet_addr(srcaddr); |
865 | if (u.sin.sin_addr.s_addr != (in_addr_t)(-1)) { |
adb18b94 |
866 | /* Override localhost_only with specified listen addr. */ |
23e649c9 |
867 | ret->localhost_only = ipv4_is_loopback(u.sin.sin_addr); |
adb18b94 |
868 | } |
23e649c9 |
869 | addr = &u; |
870 | addrlen = sizeof(u.sin); |
adb18b94 |
871 | retcode = 0; |
792c5eb5 |
872 | #endif |
adb18b94 |
873 | } |
6ee9b735 |
874 | |
adb18b94 |
875 | if (retcode != 0) { |
23e649c9 |
876 | memset(&u,'\0',sizeof u); |
adb18b94 |
877 | #ifndef NO_IPV6 |
878 | if (address_family == AF_INET6) { |
23e649c9 |
879 | u.sin6.sin6_family = AF_INET6; |
880 | u.sin6.sin6_port = htons(port); |
adb18b94 |
881 | if (local_host_only) |
23e649c9 |
882 | u.sin6.sin6_addr = in6addr_loopback; |
adb18b94 |
883 | else |
23e649c9 |
884 | u.sin6.sin6_addr = in6addr_any; |
885 | addr = &u; |
886 | addrlen = sizeof(u.sin6); |
adb18b94 |
887 | } else |
888 | #endif |
889 | { |
23e649c9 |
890 | u.sin.sin_family = AF_INET; |
891 | u.sin.sin_port = htons(port); |
6ee9b735 |
892 | if (local_host_only) |
23e649c9 |
893 | u.sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK); |
6ee9b735 |
894 | else |
23e649c9 |
895 | u.sin.sin_addr.s_addr = htonl(INADDR_ANY); |
896 | addr = &u; |
897 | addrlen = sizeof(u.sin); |
adb18b94 |
898 | } |
c5e438ec |
899 | } |
900 | |
23e649c9 |
901 | retcode = bind(s, &addr->sa, addrlen); |
adb18b94 |
902 | if (retcode < 0) { |
903 | close(s); |
7555d6a5 |
904 | ret->error = strerror(errno); |
c5e438ec |
905 | return (Socket) ret; |
906 | } |
907 | |
c5e438ec |
908 | if (listen(s, SOMAXCONN) < 0) { |
909 | close(s); |
7555d6a5 |
910 | ret->error = strerror(errno); |
c5e438ec |
911 | return (Socket) ret; |
912 | } |
913 | |
4efd5997 |
914 | #ifndef NO_IPV6 |
915 | /* |
916 | * If we were given ADDRTYPE_UNSPEC, we must also create an |
917 | * IPv4 listening socket and link it to this one. |
918 | */ |
919 | if (address_family == AF_INET6 && orig_address_family == ADDRTYPE_UNSPEC) { |
920 | Actual_Socket other; |
921 | |
922 | other = (Actual_Socket) sk_newlistener(srcaddr, port, plug, |
923 | local_host_only, ADDRTYPE_IPV4); |
924 | |
925 | if (other) { |
926 | if (!other->error) { |
927 | other->parent = ret; |
928 | ret->child = other; |
929 | } else { |
930 | /* If we couldn't create a listening socket on IPv4 as well |
931 | * as IPv6, we must return an error overall. */ |
932 | close(s); |
933 | sfree(ret); |
934 | return (Socket) other; |
935 | } |
936 | } |
937 | } |
938 | #endif |
939 | |
adb18b94 |
940 | ret->s = s; |
941 | |
0ff9ea38 |
942 | uxsel_tell(ret); |
c5e438ec |
943 | add234(sktree, ret); |
944 | |
945 | return (Socket) ret; |
946 | } |
947 | |
948 | static void sk_tcp_close(Socket sock) |
949 | { |
950 | Actual_Socket s = (Actual_Socket) sock; |
951 | |
4efd5997 |
952 | if (s->child) |
953 | sk_tcp_close((Socket)s->child); |
954 | |
0ff9ea38 |
955 | uxsel_del(s->s); |
c5e438ec |
956 | del234(sktree, s); |
957 | close(s->s); |
7555d6a5 |
958 | if (s->addr) |
959 | sk_addr_free(s->addr); |
c5e438ec |
960 | sfree(s); |
961 | } |
962 | |
0a4022a1 |
963 | void *sk_getxdmdata(void *sock, int *lenp) |
2f92b717 |
964 | { |
965 | Actual_Socket s = (Actual_Socket) sock; |
c44e5afc |
966 | union sockaddr_union u; |
2f92b717 |
967 | socklen_t addrlen; |
0a4022a1 |
968 | char *buf; |
969 | static unsigned int unix_addr = 0xFFFFFFFF; |
2f92b717 |
970 | |
971 | /* |
972 | * We must check that this socket really _is_ an Actual_Socket. |
973 | */ |
974 | if (s->fn != &tcp_fn_table) |
0a4022a1 |
975 | return NULL; /* failure */ |
2f92b717 |
976 | |
c44e5afc |
977 | addrlen = sizeof(u); |
978 | if (getsockname(s->s, &u.sa, &addrlen) < 0) |
0a4022a1 |
979 | return NULL; |
c44e5afc |
980 | switch(u.sa.sa_family) { |
fc0f17db |
981 | case AF_INET: |
0a4022a1 |
982 | *lenp = 6; |
983 | buf = snewn(*lenp, char); |
c44e5afc |
984 | PUT_32BIT_MSB_FIRST(buf, ntohl(u.sin.sin_addr.s_addr)); |
985 | PUT_16BIT_MSB_FIRST(buf+4, ntohs(u.sin.sin_port)); |
fc0f17db |
986 | break; |
0a4022a1 |
987 | #ifndef NO_IPV6 |
988 | case AF_INET6: |
989 | *lenp = 6; |
990 | buf = snewn(*lenp, char); |
c44e5afc |
991 | if (IN6_IS_ADDR_V4MAPPED(&u.sin6.sin6_addr)) { |
992 | memcpy(buf, u.sin6.sin6_addr.s6_addr + 12, 4); |
993 | PUT_16BIT_MSB_FIRST(buf+4, ntohs(u.sin6.sin6_port)); |
0a4022a1 |
994 | } else |
995 | /* This is stupid, but it's what XLib does. */ |
996 | memset(buf, 0, 6); |
997 | break; |
998 | #endif |
fc0f17db |
999 | case AF_UNIX: |
0a4022a1 |
1000 | *lenp = 6; |
1001 | buf = snewn(*lenp, char); |
1002 | PUT_32BIT_MSB_FIRST(buf, unix_addr--); |
1003 | PUT_16BIT_MSB_FIRST(buf+4, getpid()); |
fc0f17db |
1004 | break; |
2f92b717 |
1005 | |
fc0f17db |
1006 | /* XXX IPV6 */ |
1007 | |
1008 | default: |
0a4022a1 |
1009 | return NULL; |
fc0f17db |
1010 | } |
2f92b717 |
1011 | |
0a4022a1 |
1012 | return buf; |
2f92b717 |
1013 | } |
1014 | |
c5e438ec |
1015 | /* |
1016 | * The function which tries to send on a socket once it's deemed |
1017 | * writable. |
1018 | */ |
1019 | void try_send(Actual_Socket s) |
1020 | { |
1021 | while (s->sending_oob || bufchain_size(&s->output_data) > 0) { |
1022 | int nsent; |
1023 | int err; |
1024 | void *data; |
1025 | int len, urgentflag; |
1026 | |
1027 | if (s->sending_oob) { |
1028 | urgentflag = MSG_OOB; |
1029 | len = s->sending_oob; |
1030 | data = &s->oobdata; |
1031 | } else { |
1032 | urgentflag = 0; |
1033 | bufchain_prefix(&s->output_data, &data, &len); |
1034 | } |
1035 | nsent = send(s->s, data, len, urgentflag); |
1036 | noise_ultralight(nsent); |
1037 | if (nsent <= 0) { |
1038 | err = (nsent < 0 ? errno : 0); |
1039 | if (err == EWOULDBLOCK) { |
1040 | /* |
1041 | * Perfectly normal: we've sent all we can for the moment. |
1042 | */ |
1043 | s->writable = FALSE; |
1044 | return; |
f3e0acda |
1045 | } else { |
c5e438ec |
1046 | /* |
f3e0acda |
1047 | * We unfortunately can't just call plug_closing(), |
c5e438ec |
1048 | * because it's quite likely that we're currently |
1049 | * _in_ a call from the code we'd be calling back |
1050 | * to, so we'd have to make half the SSH code |
1051 | * reentrant. Instead we flag a pending error on |
1052 | * the socket, to be dealt with (by calling |
1053 | * plug_closing()) at some suitable future moment. |
1054 | */ |
1055 | s->pending_error = err; |
43a1c4a4 |
1056 | /* |
1057 | * Immediately cease selecting on this socket, so that |
1058 | * we don't tight-loop repeatedly trying to do |
1059 | * whatever it was that went wrong. |
1060 | */ |
1061 | uxsel_tell(s); |
1062 | /* |
1063 | * Notify the front end that it might want to call us. |
1064 | */ |
1065 | frontend_net_error_pending(); |
c5e438ec |
1066 | return; |
c5e438ec |
1067 | } |
1068 | } else { |
1069 | if (s->sending_oob) { |
1070 | if (nsent < len) { |
1071 | memmove(s->oobdata, s->oobdata+nsent, len-nsent); |
1072 | s->sending_oob = len - nsent; |
1073 | } else { |
1074 | s->sending_oob = 0; |
1075 | } |
1076 | } else { |
1077 | bufchain_consume(&s->output_data, nsent); |
1078 | } |
1079 | } |
1080 | } |
bc06669b |
1081 | |
1082 | /* |
1083 | * If we reach here, we've finished sending everything we might |
1084 | * have needed to send. Send EOF, if we need to. |
1085 | */ |
1086 | if (s->outgoingeof == EOF_PENDING) { |
1087 | shutdown(s->s, SHUT_WR); |
1088 | s->outgoingeof = EOF_SENT; |
1089 | } |
1090 | |
1091 | /* |
1092 | * Also update the select status, because we don't need to select |
1093 | * for writing any more. |
1094 | */ |
0ff9ea38 |
1095 | uxsel_tell(s); |
c5e438ec |
1096 | } |
1097 | |
e0e7dff8 |
1098 | static int sk_tcp_write(Socket sock, const char *buf, int len) |
c5e438ec |
1099 | { |
1100 | Actual_Socket s = (Actual_Socket) sock; |
1101 | |
bc06669b |
1102 | assert(s->outgoingeof == EOF_NO); |
1103 | |
c5e438ec |
1104 | /* |
1105 | * Add the data to the buffer list on the socket. |
1106 | */ |
1107 | bufchain_add(&s->output_data, buf, len); |
1108 | |
1109 | /* |
1110 | * Now try sending from the start of the buffer list. |
1111 | */ |
1112 | if (s->writable) |
1113 | try_send(s); |
1114 | |
c2a71b0d |
1115 | /* |
1116 | * Update the select() status to correctly reflect whether or |
1117 | * not we should be selecting for write. |
1118 | */ |
1119 | uxsel_tell(s); |
1120 | |
c5e438ec |
1121 | return bufchain_size(&s->output_data); |
1122 | } |
1123 | |
e0e7dff8 |
1124 | static int sk_tcp_write_oob(Socket sock, const char *buf, int len) |
c5e438ec |
1125 | { |
1126 | Actual_Socket s = (Actual_Socket) sock; |
1127 | |
bc06669b |
1128 | assert(s->outgoingeof == EOF_NO); |
1129 | |
c5e438ec |
1130 | /* |
1131 | * Replace the buffer list on the socket with the data. |
1132 | */ |
1133 | bufchain_clear(&s->output_data); |
1134 | assert(len <= sizeof(s->oobdata)); |
1135 | memcpy(s->oobdata, buf, len); |
1136 | s->sending_oob = len; |
1137 | |
1138 | /* |
1139 | * Now try sending from the start of the buffer list. |
1140 | */ |
1141 | if (s->writable) |
1142 | try_send(s); |
1143 | |
c2a71b0d |
1144 | /* |
1145 | * Update the select() status to correctly reflect whether or |
1146 | * not we should be selecting for write. |
1147 | */ |
1148 | uxsel_tell(s); |
1149 | |
c5e438ec |
1150 | return s->sending_oob; |
1151 | } |
1152 | |
bc06669b |
1153 | static void sk_tcp_write_eof(Socket sock) |
1154 | { |
1155 | Actual_Socket s = (Actual_Socket) sock; |
1156 | |
1157 | assert(s->outgoingeof == EOF_NO); |
1158 | |
1159 | /* |
1160 | * Mark the socket as pending outgoing EOF. |
1161 | */ |
1162 | s->outgoingeof = EOF_PENDING; |
1163 | |
1164 | /* |
1165 | * Now try sending from the start of the buffer list. |
1166 | */ |
1167 | if (s->writable) |
1168 | try_send(s); |
1169 | |
1170 | /* |
1171 | * Update the select() status to correctly reflect whether or |
1172 | * not we should be selecting for write. |
1173 | */ |
1174 | uxsel_tell(s); |
1175 | } |
1176 | |
0ff9ea38 |
1177 | static int net_select_result(int fd, int event) |
c5e438ec |
1178 | { |
1179 | int ret; |
c5e438ec |
1180 | char buf[20480]; /* nice big buffer for plenty of speed */ |
1181 | Actual_Socket s; |
1182 | u_long atmark; |
1183 | |
1184 | /* Find the Socket structure */ |
f7f9fb5c |
1185 | s = find234(sktree, &fd, cmpforsearch); |
c5e438ec |
1186 | if (!s) |
1187 | return 1; /* boggle */ |
1188 | |
1189 | noise_ultralight(event); |
1190 | |
1191 | switch (event) { |
c5e438ec |
1192 | case 4: /* exceptional */ |
1193 | if (!s->oobinline) { |
1194 | /* |
1195 | * On a non-oobinline socket, this indicates that we |
1196 | * can immediately perform an OOB read and get back OOB |
1197 | * data, which we will send to the back end with |
1198 | * type==2 (urgent data). |
1199 | */ |
1200 | ret = recv(s->s, buf, sizeof(buf), MSG_OOB); |
1201 | noise_ultralight(ret); |
1202 | if (ret <= 0) { |
f3e0acda |
1203 | return plug_closing(s->plug, |
1204 | ret == 0 ? "Internal networking trouble" : |
1205 | strerror(errno), errno, 0); |
c5e438ec |
1206 | } else { |
7555d6a5 |
1207 | /* |
1208 | * Receiving actual data on a socket means we can |
1209 | * stop falling back through the candidate |
1210 | * addresses to connect to. |
1211 | */ |
1212 | if (s->addr) { |
1213 | sk_addr_free(s->addr); |
1214 | s->addr = NULL; |
1215 | } |
c5e438ec |
1216 | return plug_receive(s->plug, 2, buf, ret); |
1217 | } |
1218 | break; |
1219 | } |
1220 | |
1221 | /* |
1222 | * If we reach here, this is an oobinline socket, which |
56e5b2db |
1223 | * means we should set s->oobpending and then deal with it |
1224 | * when we get called for the readability event (which |
1225 | * should also occur). |
c5e438ec |
1226 | */ |
1227 | s->oobpending = TRUE; |
56e5b2db |
1228 | break; |
c5e438ec |
1229 | case 1: /* readable; also acceptance */ |
1230 | if (s->listener) { |
1231 | /* |
1232 | * On a listening socket, the readability event means a |
1233 | * connection is ready to be accepted. |
1234 | */ |
23e649c9 |
1235 | union sockaddr_union su; |
1236 | socklen_t addrlen = sizeof(su); |
c5e438ec |
1237 | int t; /* socket of connection */ |
068ba98c |
1238 | int fl; |
c5e438ec |
1239 | |
23e649c9 |
1240 | memset(&su, 0, addrlen); |
1241 | t = accept(s->s, &su.sa, &addrlen); |
c5e438ec |
1242 | if (t < 0) { |
1243 | break; |
1244 | } |
1245 | |
068ba98c |
1246 | fl = fcntl(t, F_GETFL); |
1247 | if (fl != -1) |
1248 | fcntl(t, F_SETFL, fl | O_NONBLOCK); |
1249 | |
19a4130c |
1250 | if (s->localhost_only && |
23e649c9 |
1251 | !sockaddr_is_loopback(&su.sa)) { |
c5e438ec |
1252 | close(t); /* someone let nonlocal through?! */ |
f7f9fb5c |
1253 | } else if (plug_accepting(s->plug, t)) { |
c5e438ec |
1254 | close(t); /* denied or error */ |
1255 | } |
1256 | break; |
1257 | } |
1258 | |
1259 | /* |
1260 | * If we reach here, this is not a listening socket, so |
1261 | * readability really means readability. |
1262 | */ |
1263 | |
1264 | /* In the case the socket is still frozen, we don't even bother */ |
1265 | if (s->frozen) { |
1266 | s->frozen_readable = 1; |
1267 | break; |
1268 | } |
1269 | |
1270 | /* |
1271 | * We have received data on the socket. For an oobinline |
1272 | * socket, this might be data _before_ an urgent pointer, |
1273 | * in which case we send it to the back end with type==1 |
1274 | * (data prior to urgent). |
1275 | */ |
1276 | if (s->oobinline && s->oobpending) { |
1277 | atmark = 1; |
1278 | if (ioctl(s->s, SIOCATMARK, &atmark) == 0 && atmark) |
1279 | s->oobpending = FALSE; /* clear this indicator */ |
1280 | } else |
1281 | atmark = 1; |
1282 | |
56e5b2db |
1283 | ret = recv(s->s, buf, s->oobpending ? 1 : sizeof(buf), 0); |
c5e438ec |
1284 | noise_ultralight(ret); |
1285 | if (ret < 0) { |
1286 | if (errno == EWOULDBLOCK) { |
1287 | break; |
1288 | } |
1289 | } |
1290 | if (ret < 0) { |
7555d6a5 |
1291 | /* |
1292 | * An error at this point _might_ be an error reported |
1293 | * by a non-blocking connect(). So before we return a |
1294 | * panic status to the user, let's just see whether |
1295 | * that's the case. |
1296 | */ |
1297 | int err = errno; |
1298 | if (s->addr) { |
1299 | plug_log(s->plug, 1, s->addr, s->port, strerror(err), err); |
facf7568 |
1300 | while (s->addr && sk_nextaddr(s->addr, &s->step)) { |
7555d6a5 |
1301 | err = try_connect(s); |
1302 | } |
1303 | } |
1304 | if (err != 0) |
1305 | return plug_closing(s->plug, strerror(err), err, 0); |
c5e438ec |
1306 | } else if (0 == ret) { |
bc06669b |
1307 | s->incomingeof = TRUE; /* stop trying to read now */ |
1308 | uxsel_tell(s); |
c5e438ec |
1309 | return plug_closing(s->plug, NULL, 0, 0); |
1310 | } else { |
7555d6a5 |
1311 | /* |
1312 | * Receiving actual data on a socket means we can |
1313 | * stop falling back through the candidate |
1314 | * addresses to connect to. |
1315 | */ |
1316 | if (s->addr) { |
1317 | sk_addr_free(s->addr); |
1318 | s->addr = NULL; |
1319 | } |
c5e438ec |
1320 | return plug_receive(s->plug, atmark ? 0 : 1, buf, ret); |
1321 | } |
1322 | break; |
1323 | case 2: /* writable */ |
051dd789 |
1324 | if (!s->connected) { |
1325 | /* |
1326 | * select() reports a socket as _writable_ when an |
1327 | * asynchronous connection is completed. |
1328 | */ |
1329 | s->connected = s->writable = 1; |
0ff9ea38 |
1330 | uxsel_tell(s); |
051dd789 |
1331 | break; |
1332 | } else { |
c5e438ec |
1333 | int bufsize_before, bufsize_after; |
1334 | s->writable = 1; |
1335 | bufsize_before = s->sending_oob + bufchain_size(&s->output_data); |
1336 | try_send(s); |
1337 | bufsize_after = s->sending_oob + bufchain_size(&s->output_data); |
1338 | if (bufsize_after < bufsize_before) |
1339 | plug_sent(s->plug, bufsize_after); |
1340 | } |
1341 | break; |
1342 | } |
1343 | |
1344 | return 1; |
1345 | } |
1346 | |
1347 | /* |
1348 | * Deal with socket errors detected in try_send(). |
1349 | */ |
1350 | void net_pending_errors(void) |
1351 | { |
1352 | int i; |
1353 | Actual_Socket s; |
1354 | |
1355 | /* |
1356 | * This might be a fiddly business, because it's just possible |
1357 | * that handling a pending error on one socket might cause |
1358 | * others to be closed. (I can't think of any reason this might |
1359 | * happen in current SSH implementation, but to maintain |
1360 | * generality of this network layer I'll assume the worst.) |
1361 | * |
1362 | * So what we'll do is search the socket list for _one_ socket |
1363 | * with a pending error, and then handle it, and then search |
1364 | * the list again _from the beginning_. Repeat until we make a |
1365 | * pass with no socket errors present. That way we are |
1366 | * protected against the socket list changing under our feet. |
1367 | */ |
1368 | |
1369 | do { |
1370 | for (i = 0; (s = index234(sktree, i)) != NULL; i++) { |
1371 | if (s->pending_error) { |
1372 | /* |
1373 | * An error has occurred on this socket. Pass it to the |
1374 | * plug. |
1375 | */ |
7555d6a5 |
1376 | plug_closing(s->plug, strerror(s->pending_error), |
c5e438ec |
1377 | s->pending_error, 0); |
1378 | break; |
1379 | } |
1380 | } |
1381 | } while (s); |
1382 | } |
1383 | |
1384 | /* |
1385 | * Each socket abstraction contains a `void *' private field in |
1386 | * which the client can keep state. |
1387 | */ |
1388 | static void sk_tcp_set_private_ptr(Socket sock, void *ptr) |
1389 | { |
1390 | Actual_Socket s = (Actual_Socket) sock; |
1391 | s->private_ptr = ptr; |
1392 | } |
1393 | |
1394 | static void *sk_tcp_get_private_ptr(Socket sock) |
1395 | { |
1396 | Actual_Socket s = (Actual_Socket) sock; |
1397 | return s->private_ptr; |
1398 | } |
1399 | |
1400 | /* |
1401 | * Special error values are returned from sk_namelookup and sk_new |
1402 | * if there's a problem. These functions extract an error message, |
1403 | * or return NULL if there's no problem. |
1404 | */ |
cbe2d68f |
1405 | const char *sk_addr_error(SockAddr addr) |
c5e438ec |
1406 | { |
1407 | return addr->error; |
1408 | } |
cbe2d68f |
1409 | static const char *sk_tcp_socket_error(Socket sock) |
c5e438ec |
1410 | { |
1411 | Actual_Socket s = (Actual_Socket) sock; |
1412 | return s->error; |
1413 | } |
1414 | |
1415 | static void sk_tcp_set_frozen(Socket sock, int is_frozen) |
1416 | { |
1417 | Actual_Socket s = (Actual_Socket) sock; |
1418 | if (s->frozen == is_frozen) |
1419 | return; |
1420 | s->frozen = is_frozen; |
1421 | if (!is_frozen && s->frozen_readable) { |
1422 | char c; |
1423 | recv(s->s, &c, 1, MSG_PEEK); |
1424 | } |
1425 | s->frozen_readable = 0; |
0ff9ea38 |
1426 | uxsel_tell(s); |
c5e438ec |
1427 | } |
1428 | |
0ff9ea38 |
1429 | static void uxsel_tell(Actual_Socket s) |
c5e438ec |
1430 | { |
0ff9ea38 |
1431 | int rwx = 0; |
43a1c4a4 |
1432 | if (!s->pending_error) { |
1433 | if (s->listener) { |
1434 | rwx |= 1; /* read == accept */ |
1435 | } else { |
1436 | if (!s->connected) |
1437 | rwx |= 2; /* write == connect */ |
1438 | if (s->connected && !s->frozen && !s->incomingeof) |
1439 | rwx |= 1 | 4; /* read, except */ |
1440 | if (bufchain_size(&s->output_data)) |
1441 | rwx |= 2; /* write */ |
1442 | } |
1cfc764f |
1443 | } |
0ff9ea38 |
1444 | uxsel_set(s->s, rwx, net_select_result); |
c5e438ec |
1445 | } |
1446 | |
1447 | int net_service_lookup(char *service) |
1448 | { |
1449 | struct servent *se; |
1450 | se = getservbyname(service, NULL); |
1451 | if (se != NULL) |
1452 | return ntohs(se->s_port); |
1453 | else |
1454 | return 0; |
1455 | } |
fc0f17db |
1456 | |
42547ed9 |
1457 | char *get_hostname(void) |
1458 | { |
1459 | int len = 128; |
1460 | char *hostname = NULL; |
1461 | do { |
1462 | len *= 2; |
1463 | hostname = sresize(hostname, len, char); |
1464 | if ((gethostname(hostname, len) < 0) && |
1465 | (errno != ENAMETOOLONG)) { |
1466 | sfree(hostname); |
1467 | hostname = NULL; |
1468 | break; |
1469 | } |
1470 | } while (strlen(hostname) >= len-1); |
1471 | return hostname; |
1472 | } |
1473 | |
8def70c3 |
1474 | SockAddr platform_get_x11_unix_address(const char *sockpath, int displaynum) |
fc0f17db |
1475 | { |
1476 | SockAddr ret = snew(struct SockAddr_tag); |
1477 | int n; |
1478 | |
1479 | memset(ret, 0, sizeof *ret); |
facf7568 |
1480 | ret->superfamily = UNIX; |
48806a46 |
1481 | /* |
8def70c3 |
1482 | * In special circumstances (notably Mac OS X Leopard), we'll |
1483 | * have been passed an explicit Unix socket path. |
48806a46 |
1484 | */ |
8def70c3 |
1485 | if (sockpath) { |
48806a46 |
1486 | n = snprintf(ret->hostname, sizeof ret->hostname, |
8def70c3 |
1487 | "%s", sockpath); |
48806a46 |
1488 | } else { |
1489 | n = snprintf(ret->hostname, sizeof ret->hostname, |
1490 | "%s%d", X11_UNIX_PATH, displaynum); |
1491 | } |
8def70c3 |
1492 | |
1493 | if (n < 0) |
fc0f17db |
1494 | ret->error = "snprintf failed"; |
8def70c3 |
1495 | else if (n >= sizeof ret->hostname) |
fc0f17db |
1496 | ret->error = "X11 UNIX name too long"; |
8def70c3 |
1497 | |
7555d6a5 |
1498 | #ifndef NO_IPV6 |
facf7568 |
1499 | ret->ais = NULL; |
7555d6a5 |
1500 | #else |
1501 | ret->addresses = NULL; |
facf7568 |
1502 | ret->naddresses = 0; |
7555d6a5 |
1503 | #endif |
5025a993 |
1504 | ret->refcount = 1; |
fc0f17db |
1505 | return ret; |
1506 | } |