Commit | Line | Data |
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7c1b4daa MP |
1 | /* -*- c-file-style: "linux" -*- |
2 | ||
d54765c4 MP |
3 | rsync -- fast file replication program |
4 | ||
eecd22ff | 5 | Copyright (C) 1992-2001 by Andrew Tridgell <tridge@samba.org> |
362099a5 | 6 | Copyright (C) 2001, 2002 by Martin Pool <mbp@samba.org> |
bc2e93eb AT |
7 | |
8 | This program is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with this program; if not, write to the Free Software | |
20 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
21 | */ | |
22 | ||
d5d4b282 MP |
23 | /** |
24 | * @file socket.c | |
25 | * | |
26 | * Socket functions used in rsync. | |
362099a5 MP |
27 | * |
28 | * This file is now converted to use the new-style getaddrinfo() | |
29 | * interface, which supports IPv6 but is also supported on recent | |
30 | * IPv4-only machines. On systems that don't have that interface, we | |
31 | * emulate it using the KAME implementation. | |
d5d4b282 | 32 | **/ |
bc2e93eb | 33 | |
f0fca04e AT |
34 | #include "rsync.h" |
35 | ||
9a5a8673 | 36 | |
a7dc44d2 MP |
37 | /** |
38 | * Establish a proxy connection on an open socket to a web proxy by | |
39 | * using the HTTP CONNECT method. | |
40 | **/ | |
4c3b4b25 AT |
41 | static int establish_proxy_connection(int fd, char *host, int port) |
42 | { | |
43 | char buffer[1024]; | |
44 | char *cp; | |
45 | ||
8950ac03 | 46 | snprintf(buffer, sizeof(buffer), "CONNECT %s:%d HTTP/1.0\r\n\r\n", host, port); |
00d943d5 | 47 | if (write(fd, buffer, strlen(buffer)) != (int) strlen(buffer)) { |
660c6fbd | 48 | rprintf(FERROR, "failed to write to proxy: %s\n", |
4c3b4b25 AT |
49 | strerror(errno)); |
50 | return -1; | |
51 | } | |
52 | ||
53 | for (cp = buffer; cp < &buffer[sizeof(buffer) - 1]; cp++) { | |
54 | if (read(fd, cp, 1) != 1) { | |
660c6fbd MP |
55 | rprintf(FERROR, "failed to read from proxy: %s\n", |
56 | strerror(errno)); | |
4c3b4b25 AT |
57 | return -1; |
58 | } | |
59 | if (*cp == '\n') | |
60 | break; | |
61 | } | |
62 | ||
63 | if (*cp != '\n') | |
64 | cp++; | |
65 | *cp-- = '\0'; | |
66 | if (*cp == '\r') | |
67 | *cp = '\0'; | |
68 | if (strncmp(buffer, "HTTP/", 5) != 0) { | |
69 | rprintf(FERROR, "bad response from proxy - %s\n", | |
70 | buffer); | |
71 | return -1; | |
72 | } | |
32f76175 | 73 | for (cp = &buffer[5]; isdigit(* (unsigned char *) cp) || (*cp == '.'); cp++) |
4c3b4b25 AT |
74 | ; |
75 | while (*cp == ' ') | |
76 | cp++; | |
77 | if (*cp != '2') { | |
78 | rprintf(FERROR, "bad response from proxy - %s\n", | |
79 | buffer); | |
80 | return -1; | |
81 | } | |
82 | /* throw away the rest of the HTTP header */ | |
83 | while (1) { | |
84 | for (cp = buffer; cp < &buffer[sizeof(buffer) - 1]; | |
85 | cp++) { | |
86 | if (read(fd, cp, 1) != 1) { | |
660c6fbd MP |
87 | rprintf(FERROR, "failed to read from proxy: %s\n", |
88 | strerror(errno)); | |
4c3b4b25 AT |
89 | return -1; |
90 | } | |
91 | if (*cp == '\n') | |
92 | break; | |
93 | } | |
94 | if ((cp > buffer) && (*cp == '\n')) | |
95 | cp--; | |
96 | if ((cp == buffer) && ((*cp == '\n') || (*cp == '\r'))) | |
97 | break; | |
98 | } | |
99 | return 0; | |
100 | } | |
101 | ||
102 | ||
f8be7d42 MP |
103 | /** |
104 | * Try to set the local address for a newly-created socket. Return -1 | |
105 | * if this fails. | |
106 | **/ | |
107 | int try_bind_local(int s, | |
108 | int ai_family, int ai_socktype, | |
109 | const char *bind_address) | |
110 | { | |
111 | int error; | |
112 | struct addrinfo bhints, *bres_all, *r; | |
113 | ||
114 | memset(&bhints, 0, sizeof(bhints)); | |
115 | bhints.ai_family = ai_family; | |
116 | bhints.ai_socktype = ai_socktype; | |
117 | bhints.ai_flags = AI_PASSIVE; | |
98355b80 | 118 | if ((error = getaddrinfo(bind_address, NULL, &bhints, &bres_all))) { |
f8be7d42 MP |
119 | rprintf(FERROR, RSYNC_NAME ": getaddrinfo %s: %s\n", |
120 | bind_address, gai_strerror(error)); | |
121 | return -1; | |
122 | } | |
123 | ||
124 | for (r = bres_all; r; r = r->ai_next) { | |
9ec75284 | 125 | if (bind(s, r->ai_addr, r->ai_addrlen) == -1) |
f8be7d42 | 126 | continue; |
6b2d24de | 127 | freeaddrinfo(bres_all); |
f8be7d42 MP |
128 | return s; |
129 | } | |
130 | ||
131 | /* no error message; there might be some problem that allows | |
132 | * creation of the socket but not binding, perhaps if the | |
133 | * machine has no ipv6 address of this name. */ | |
6b2d24de | 134 | freeaddrinfo(bres_all); |
f8be7d42 MP |
135 | return -1; |
136 | } | |
137 | ||
eecd22ff | 138 | |
d5d4b282 MP |
139 | /** |
140 | * Open a socket to a tcp remote host with the specified port . | |
06963d0f | 141 | * |
d5d4b282 MP |
142 | * Based on code from Warren. Proxy support by Stephen Rothwell. |
143 | * getaddrinfo() rewrite contributed by KAME.net. | |
06963d0f | 144 | * |
d5d4b282 MP |
145 | * Now that we support IPv6 we need to look up the remote machine's |
146 | * address first, using @p af_hint to set a preference for the type | |
147 | * of address. Then depending on whether it has v4 or v6 addresses we | |
148 | * try to open a connection. | |
06963d0f | 149 | * |
d5d4b282 MP |
150 | * The loop allows for machines with some addresses which may not be |
151 | * reachable, perhaps because we can't e.g. route ipv6 to that network | |
152 | * but we can get ip4 packets through. | |
153 | * | |
154 | * @param bind_address Local address to use. Normally NULL to bind | |
155 | * the wildcard address. | |
156 | * | |
157 | * @param af_hint Address family, e.g. AF_INET or AF_INET6. | |
06963d0f | 158 | **/ |
d5d4b282 MP |
159 | int open_socket_out(char *host, int port, const char *bind_address, |
160 | int af_hint) | |
bc2e93eb | 161 | { |
f0fca04e | 162 | int type = SOCK_STREAM; |
06963d0f MP |
163 | int error; |
164 | int s; | |
06963d0f MP |
165 | struct addrinfo hints, *res0, *res; |
166 | char portbuf[10]; | |
4c3b4b25 | 167 | char *h; |
4c3b4b25 AT |
168 | int proxied = 0; |
169 | char buffer[1024]; | |
170 | char *cp; | |
171 | ||
660c6fbd MP |
172 | /* if we have a RSYNC_PROXY env variable then redirect our |
173 | * connetcion via a web proxy at the given address. The format | |
174 | * is hostname:port */ | |
4c3b4b25 AT |
175 | h = getenv("RSYNC_PROXY"); |
176 | proxied = (h != NULL) && (*h != '\0'); | |
177 | ||
178 | if (proxied) { | |
179 | strlcpy(buffer, h, sizeof(buffer)); | |
180 | cp = strchr(buffer, ':'); | |
181 | if (cp == NULL) { | |
660c6fbd MP |
182 | rprintf(FERROR, |
183 | "invalid proxy specification: should be HOST:PORT\n"); | |
4c3b4b25 AT |
184 | return -1; |
185 | } | |
186 | *cp++ = '\0'; | |
06963d0f | 187 | strcpy(portbuf, cp); |
4c3b4b25 | 188 | h = buffer; |
7bea78ce MP |
189 | if (verbose >= 2) { |
190 | rprintf(FINFO, "connection via http proxy %s port %s\n", | |
191 | h, portbuf); | |
192 | } | |
4c3b4b25 | 193 | } else { |
06963d0f | 194 | snprintf(portbuf, sizeof(portbuf), "%d", port); |
4c3b4b25 | 195 | h = host; |
4c3b4b25 | 196 | } |
f0fca04e | 197 | |
06963d0f | 198 | memset(&hints, 0, sizeof(hints)); |
d5d4b282 | 199 | hints.ai_family = af_hint; |
06963d0f MP |
200 | hints.ai_socktype = type; |
201 | error = getaddrinfo(h, portbuf, &hints, &res0); | |
202 | if (error) { | |
d5d4b282 MP |
203 | rprintf(FERROR, RSYNC_NAME ": getaddrinfo: %s %s: %s\n", |
204 | h, portbuf, gai_strerror(error)); | |
f0fca04e AT |
205 | return -1; |
206 | } | |
207 | ||
06963d0f | 208 | s = -1; |
2d6dbe29 MP |
209 | /* Try to connect to all addresses for this machine until we get |
210 | * through. It might e.g. be multi-homed, or have both IPv4 and IPv6 | |
211 | * addresses. We need to create a socket for each record, since the | |
212 | * address record tells us what protocol to use to try to connect. */ | |
06963d0f MP |
213 | for (res = res0; res; res = res->ai_next) { |
214 | s = socket(res->ai_family, res->ai_socktype, res->ai_protocol); | |
215 | if (s < 0) | |
216 | continue; | |
f0fca04e | 217 | |
f8be7d42 MP |
218 | if (bind_address) |
219 | if (try_bind_local(s, res->ai_family, type, | |
220 | bind_address) == -1) { | |
221 | close(s); | |
222 | s = -1; | |
06963d0f MP |
223 | continue; |
224 | } | |
e30f0657 | 225 | |
06963d0f MP |
226 | if (connect(s, res->ai_addr, res->ai_addrlen) < 0) { |
227 | close(s); | |
228 | s = -1; | |
229 | continue; | |
230 | } | |
231 | if (proxied && | |
232 | establish_proxy_connection(s, host, port) != 0) { | |
233 | close(s); | |
234 | s = -1; | |
235 | continue; | |
236 | } else | |
237 | break; | |
4c3b4b25 | 238 | } |
06963d0f MP |
239 | freeaddrinfo(res0); |
240 | if (s < 0) { | |
7ef6aa64 MP |
241 | rprintf(FERROR, RSYNC_NAME ": failed to connect to %s: %s\n", |
242 | h, strerror(errno)); | |
f0fca04e AT |
243 | return -1; |
244 | } | |
06963d0f | 245 | return s; |
f0fca04e AT |
246 | } |
247 | ||
248 | ||
eecd22ff MP |
249 | /** |
250 | * Open an outgoing socket, but allow for it to be intercepted by | |
251 | * $RSYNC_CONNECT_PROG, which will execute a program across a TCP | |
252 | * socketpair rather than really opening a socket. | |
253 | * | |
254 | * We use this primarily in testing to detect TCP flow bugs, but not | |
255 | * cause security problems by really opening remote connections. | |
256 | * | |
257 | * This is based on the Samba LIBSMB_PROG feature. | |
06963d0f MP |
258 | * |
259 | * @param bind_address Local address to use. Normally NULL to get the stack default. | |
eecd22ff MP |
260 | **/ |
261 | int open_socket_out_wrapped (char *host, | |
262 | int port, | |
d5d4b282 MP |
263 | const char *bind_address, |
264 | int af_hint) | |
eecd22ff MP |
265 | { |
266 | char *prog; | |
267 | ||
268 | if ((prog = getenv ("RSYNC_CONNECT_PROG")) != NULL) | |
269 | return sock_exec (prog); | |
270 | else | |
d5d4b282 MP |
271 | return open_socket_out (host, port, bind_address, |
272 | af_hint); | |
eecd22ff MP |
273 | } |
274 | ||
275 | ||
276 | ||
06963d0f MP |
277 | /** |
278 | * Open a socket of the specified type, port and address for incoming data | |
279 | * | |
b8771f96 MP |
280 | * Try to be better about handling the results of getaddrinfo(): when |
281 | * opening an inbound socket, we might get several address results, | |
282 | * e.g. for the machine's ipv4 and ipv6 name. | |
283 | * | |
284 | * If binding a wildcard, then any one of them should do. If an address | |
285 | * was specified but it's insufficiently specific then that's not our | |
286 | * fault. | |
287 | * | |
288 | * However, some of the advertized addresses may not work because e.g. we | |
289 | * don't have IPv6 support in the kernel. In that case go on and try all | |
290 | * addresses until one succeeds. | |
291 | * | |
06963d0f MP |
292 | * @param bind_address Local address to bind, or NULL to allow it to |
293 | * default. | |
294 | **/ | |
d5d4b282 MP |
295 | static int open_socket_in(int type, int port, const char *bind_address, |
296 | int af_hint) | |
f0fca04e | 297 | { |
f0fca04e | 298 | int one=1; |
06963d0f | 299 | int s; |
13e29995 | 300 | struct addrinfo hints, *all_ai, *resp; |
06963d0f MP |
301 | char portbuf[10]; |
302 | int error; | |
303 | ||
304 | memset(&hints, 0, sizeof(hints)); | |
d5d4b282 | 305 | hints.ai_family = af_hint; |
06963d0f MP |
306 | hints.ai_socktype = type; |
307 | hints.ai_flags = AI_PASSIVE; | |
308 | snprintf(portbuf, sizeof(portbuf), "%d", port); | |
13e29995 | 309 | error = getaddrinfo(bind_address, portbuf, &hints, &all_ai); |
06963d0f | 310 | if (error) { |
7ef6aa64 MP |
311 | rprintf(FERROR, RSYNC_NAME ": getaddrinfo: bind address %s: %s\n", |
312 | bind_address, gai_strerror(error)); | |
06963d0f MP |
313 | return -1; |
314 | } | |
06963d0f | 315 | |
13e29995 MP |
316 | /* We may not be able to create the socket, if for example the |
317 | * machine knows about IPv6 in the C library, but not in the | |
318 | * kernel. */ | |
319 | for (resp = all_ai; resp; resp = resp->ai_next) { | |
320 | s = socket(resp->ai_family, resp->ai_socktype, | |
321 | resp->ai_protocol); | |
322 | ||
323 | if (s == -1) | |
324 | /* See if there's another address that will work... */ | |
325 | continue; | |
326 | ||
327 | setsockopt(s, SOL_SOCKET, SO_REUSEADDR, | |
328 | (char *)&one, sizeof one); | |
329 | ||
330 | /* now we've got a socket - we need to bind it */ | |
331 | if (bind(s, all_ai->ai_addr, all_ai->ai_addrlen) < 0) { | |
332 | /* Nope, try another */ | |
333 | close(s); | |
334 | continue; | |
b8771f96 | 335 | } |
e23d790f | 336 | |
6b2d24de | 337 | freeaddrinfo(all_ai); |
13e29995 | 338 | return s; |
f0fca04e AT |
339 | } |
340 | ||
13e29995 MP |
341 | rprintf(FERROR, RSYNC_NAME ": open inbound socket on port %d failed: " |
342 | "%s\n", | |
343 | port, | |
344 | strerror(errno)); | |
b8771f96 | 345 | |
13e29995 | 346 | freeaddrinfo(all_ai); |
b8771f96 | 347 | return -1; |
f0fca04e AT |
348 | } |
349 | ||
350 | ||
7c1b4daa MP |
351 | /* |
352 | * Determine if a file descriptor is in fact a socket | |
353 | */ | |
f0fca04e AT |
354 | int is_a_socket(int fd) |
355 | { | |
ac2a1a44 MP |
356 | int v; |
357 | socklen_t l; | |
3eb38818 | 358 | l = sizeof(int); |
7c1b4daa MP |
359 | |
360 | /* Parameters to getsockopt, setsockopt etc are very | |
361 | * unstandardized across platforms, so don't be surprised if | |
ac2a1a44 MP |
362 | * there are compiler warnings on e.g. SCO OpenSwerver or AIX. |
363 | * It seems they all eventually get the right idea. | |
7c1b4daa MP |
364 | * |
365 | * Debian says: ``The fifth argument of getsockopt and | |
366 | * setsockopt is in reality an int [*] (and this is what BSD | |
367 | * 4.* and libc4 and libc5 have). Some POSIX confusion | |
368 | * resulted in the present socklen_t. The draft standard has | |
369 | * not been adopted yet, but glibc2 already follows it and | |
370 | * also has socklen_t [*]. See also accept(2).'' | |
371 | * | |
372 | * We now return to your regularly scheduled programming. */ | |
3eb38818 | 373 | return(getsockopt(fd, SOL_SOCKET, SO_TYPE, (char *)&v, &l) == 0); |
f0fca04e AT |
374 | } |
375 | ||
376 | ||
ca20c7fd WD |
377 | static RETSIGTYPE sigchld_handler(int UNUSED(val)) { |
378 | signal(SIGCHLD, sigchld_handler); | |
379 | #ifdef WNOHANG | |
380 | while (waitpid(-1, NULL, WNOHANG) > 0) {} | |
381 | #endif | |
382 | } | |
383 | ||
384 | ||
39993af5 | 385 | void start_accept_loop(int port, int (*fn)(int, int)) |
f0fca04e AT |
386 | { |
387 | int s; | |
06963d0f | 388 | extern char *bind_address; |
13e29995 | 389 | extern int default_af_hint; |
f0fca04e | 390 | |
f0fca04e | 391 | /* open an incoming socket */ |
13e29995 | 392 | s = open_socket_in(SOCK_STREAM, port, bind_address, default_af_hint); |
f0fca04e | 393 | if (s == -1) |
65417579 | 394 | exit_cleanup(RERR_SOCKETIO); |
f0fca04e AT |
395 | |
396 | /* ready to listen */ | |
397 | if (listen(s, 5) == -1) { | |
398 | close(s); | |
65417579 | 399 | exit_cleanup(RERR_SOCKETIO); |
f0fca04e AT |
400 | } |
401 | ||
402 | ||
403 | /* now accept incoming connections - forking a new process | |
404 | for each incoming connection */ | |
405 | while (1) { | |
406 | fd_set fds; | |
c4a5c57d | 407 | pid_t pid; |
f0fca04e | 408 | int fd; |
2d6dbe29 | 409 | struct sockaddr_storage addr; |
d54765c4 | 410 | socklen_t addrlen = sizeof addr; |
f0fca04e | 411 | |
15b84e14 DD |
412 | /* close log file before the potentially very long select so |
413 | file can be trimmed by another process instead of growing | |
414 | forever */ | |
415 | log_close(); | |
45a83540 | 416 | |
f0fca04e AT |
417 | FD_ZERO(&fds); |
418 | FD_SET(s, &fds); | |
419 | ||
420 | if (select(s+1, &fds, NULL, NULL, NULL) != 1) { | |
421 | continue; | |
422 | } | |
423 | ||
424 | if(!FD_ISSET(s, &fds)) continue; | |
425 | ||
2d6dbe29 | 426 | fd = accept(s,(struct sockaddr *)&addr,&addrlen); |
f0fca04e AT |
427 | |
428 | if (fd == -1) continue; | |
429 | ||
ca20c7fd | 430 | signal(SIGCHLD, sigchld_handler); |
31f440e6 | 431 | |
c4a5c57d | 432 | if ((pid = fork()) == 0) { |
9f639210 | 433 | int ret; |
f0fca04e | 434 | close(s); |
15b84e14 DD |
435 | /* open log file in child before possibly giving |
436 | up privileges */ | |
437 | log_open(); | |
9f639210 DD |
438 | ret = fn(fd, fd); |
439 | close_all(); | |
440 | _exit(ret); | |
c4a5c57d MP |
441 | } else if (pid < 0) { |
442 | rprintf(FERROR, | |
443 | RSYNC_NAME | |
444 | ": could not create child server process: %s\n", | |
445 | strerror(errno)); | |
446 | close(fd); | |
447 | /* This might have happened because we're | |
448 | * overloaded. Sleep briefly before trying to | |
449 | * accept again. */ | |
450 | sleep(2); | |
bd37c666 | 451 | } else { |
79845f28 | 452 | /* Parent doesn't need this fd anymore. */ |
bd37c666 | 453 | close(fd); |
f0fca04e | 454 | } |
f0fca04e | 455 | } |
f0fca04e AT |
456 | } |
457 | ||
458 | ||
459 | enum SOCK_OPT_TYPES {OPT_BOOL,OPT_INT,OPT_ON}; | |
460 | ||
461 | struct | |
462 | { | |
463 | char *name; | |
464 | int level; | |
465 | int option; | |
466 | int value; | |
467 | int opttype; | |
468 | } socket_options[] = { | |
469 | {"SO_KEEPALIVE", SOL_SOCKET, SO_KEEPALIVE, 0, OPT_BOOL}, | |
470 | {"SO_REUSEADDR", SOL_SOCKET, SO_REUSEADDR, 0, OPT_BOOL}, | |
471 | {"SO_BROADCAST", SOL_SOCKET, SO_BROADCAST, 0, OPT_BOOL}, | |
472 | #ifdef TCP_NODELAY | |
473 | {"TCP_NODELAY", IPPROTO_TCP, TCP_NODELAY, 0, OPT_BOOL}, | |
474 | #endif | |
475 | #ifdef IPTOS_LOWDELAY | |
476 | {"IPTOS_LOWDELAY", IPPROTO_IP, IP_TOS, IPTOS_LOWDELAY, OPT_ON}, | |
477 | #endif | |
478 | #ifdef IPTOS_THROUGHPUT | |
479 | {"IPTOS_THROUGHPUT", IPPROTO_IP, IP_TOS, IPTOS_THROUGHPUT, OPT_ON}, | |
480 | #endif | |
481 | #ifdef SO_SNDBUF | |
482 | {"SO_SNDBUF", SOL_SOCKET, SO_SNDBUF, 0, OPT_INT}, | |
483 | #endif | |
484 | #ifdef SO_RCVBUF | |
485 | {"SO_RCVBUF", SOL_SOCKET, SO_RCVBUF, 0, OPT_INT}, | |
486 | #endif | |
487 | #ifdef SO_SNDLOWAT | |
488 | {"SO_SNDLOWAT", SOL_SOCKET, SO_SNDLOWAT, 0, OPT_INT}, | |
489 | #endif | |
490 | #ifdef SO_RCVLOWAT | |
491 | {"SO_RCVLOWAT", SOL_SOCKET, SO_RCVLOWAT, 0, OPT_INT}, | |
492 | #endif | |
493 | #ifdef SO_SNDTIMEO | |
494 | {"SO_SNDTIMEO", SOL_SOCKET, SO_SNDTIMEO, 0, OPT_INT}, | |
495 | #endif | |
496 | #ifdef SO_RCVTIMEO | |
497 | {"SO_RCVTIMEO", SOL_SOCKET, SO_RCVTIMEO, 0, OPT_INT}, | |
498 | #endif | |
499 | {NULL,0,0,0,0}}; | |
500 | ||
501 | ||
502 | ||
a7dc44d2 MP |
503 | /** |
504 | * Set user socket options | |
505 | **/ | |
f0fca04e AT |
506 | void set_socket_options(int fd, char *options) |
507 | { | |
508 | char *tok; | |
a6801c39 AT |
509 | if (!options || !*options) return; |
510 | ||
f0fca04e AT |
511 | options = strdup(options); |
512 | ||
513 | if (!options) out_of_memory("set_socket_options"); | |
514 | ||
515 | for (tok=strtok(options, " \t,"); tok; tok=strtok(NULL," \t,")) { | |
516 | int ret=0,i; | |
517 | int value = 1; | |
518 | char *p; | |
519 | int got_value = 0; | |
520 | ||
521 | if ((p = strchr(tok,'='))) { | |
522 | *p = 0; | |
523 | value = atoi(p+1); | |
524 | got_value = 1; | |
525 | } | |
526 | ||
527 | for (i=0;socket_options[i].name;i++) | |
528 | if (strcmp(socket_options[i].name,tok)==0) | |
529 | break; | |
530 | ||
531 | if (!socket_options[i].name) { | |
532 | rprintf(FERROR,"Unknown socket option %s\n",tok); | |
533 | continue; | |
534 | } | |
535 | ||
536 | switch (socket_options[i].opttype) { | |
537 | case OPT_BOOL: | |
538 | case OPT_INT: | |
539 | ret = setsockopt(fd,socket_options[i].level, | |
540 | socket_options[i].option,(char *)&value,sizeof(int)); | |
541 | break; | |
542 | ||
543 | case OPT_ON: | |
544 | if (got_value) | |
545 | rprintf(FERROR,"syntax error - %s does not take a value\n",tok); | |
546 | ||
547 | { | |
548 | int on = socket_options[i].value; | |
549 | ret = setsockopt(fd,socket_options[i].level, | |
550 | socket_options[i].option,(char *)&on,sizeof(int)); | |
551 | } | |
552 | break; | |
553 | } | |
554 | ||
555 | if (ret != 0) | |
660c6fbd MP |
556 | rprintf(FERROR, "failed to set socket option %s: %s\n", tok, |
557 | strerror(errno)); | |
f0fca04e AT |
558 | } |
559 | ||
560 | free(options); | |
561 | } | |
562 | ||
a7dc44d2 MP |
563 | /** |
564 | * Become a daemon, discarding the controlling terminal | |
565 | **/ | |
f0fca04e AT |
566 | void become_daemon(void) |
567 | { | |
b11ed3b1 AT |
568 | int i; |
569 | ||
c46ded46 | 570 | if (fork()) { |
f0fca04e | 571 | _exit(0); |
c46ded46 | 572 | } |
f0fca04e AT |
573 | |
574 | /* detach from the terminal */ | |
575 | #ifdef HAVE_SETSID | |
576 | setsid(); | |
577 | #else | |
578 | #ifdef TIOCNOTTY | |
c46ded46 AT |
579 | i = open("/dev/tty", O_RDWR); |
580 | if (i >= 0) { | |
581 | ioctl(i, (int) TIOCNOTTY, (char *)0); | |
582 | close(i); | |
f0fca04e AT |
583 | } |
584 | #endif /* TIOCNOTTY */ | |
585 | #endif | |
b11ed3b1 AT |
586 | /* make sure that stdin, stdout an stderr don't stuff things |
587 | up (library functions, for example) */ | |
588 | for (i=0;i<3;i++) { | |
589 | close(i); | |
590 | open("/dev/null", O_RDWR); | |
591 | } | |
bc2e93eb | 592 | } |
ff8b29b8 | 593 | |
eecd22ff | 594 | |
a7dc44d2 MP |
595 | /** |
596 | * This is like socketpair but uses tcp. It is used by the Samba | |
597 | * regression test code. | |
598 | * | |
599 | * The function guarantees that nobody else can attach to the socket, | |
600 | * or if they do that this function fails and the socket gets closed | |
601 | * returns 0 on success, -1 on failure the resulting file descriptors | |
602 | * are symmetrical. | |
603 | **/ | |
eecd22ff MP |
604 | static int socketpair_tcp(int fd[2]) |
605 | { | |
606 | int listener; | |
607 | struct sockaddr_in sock; | |
608 | struct sockaddr_in sock2; | |
609 | socklen_t socklen = sizeof(sock); | |
610 | int connect_done = 0; | |
611 | ||
612 | fd[0] = fd[1] = listener = -1; | |
613 | ||
614 | memset(&sock, 0, sizeof(sock)); | |
615 | ||
616 | if ((listener = socket(PF_INET, SOCK_STREAM, 0)) == -1) goto failed; | |
617 | ||
618 | memset(&sock2, 0, sizeof(sock2)); | |
14579493 | 619 | #ifdef HAVE_SOCKADDR_LEN |
eecd22ff MP |
620 | sock2.sin_len = sizeof(sock2); |
621 | #endif | |
622 | sock2.sin_family = PF_INET; | |
623 | ||
624 | bind(listener, (struct sockaddr *)&sock2, sizeof(sock2)); | |
625 | ||
626 | if (listen(listener, 1) != 0) goto failed; | |
627 | ||
628 | if (getsockname(listener, (struct sockaddr *)&sock, &socklen) != 0) goto failed; | |
629 | ||
630 | if ((fd[1] = socket(PF_INET, SOCK_STREAM, 0)) == -1) goto failed; | |
631 | ||
632 | set_nonblocking(fd[1]); | |
633 | ||
634 | sock.sin_addr.s_addr = htonl(INADDR_LOOPBACK); | |
635 | ||
636 | if (connect(fd[1],(struct sockaddr *)&sock,sizeof(sock)) == -1) { | |
637 | if (errno != EINPROGRESS) goto failed; | |
638 | } else { | |
639 | connect_done = 1; | |
640 | } | |
641 | ||
642 | if ((fd[0] = accept(listener, (struct sockaddr *)&sock, &socklen)) == -1) goto failed; | |
643 | ||
644 | close(listener); | |
645 | if (connect_done == 0) { | |
646 | if (connect(fd[1],(struct sockaddr *)&sock,sizeof(sock)) != 0 | |
647 | && errno != EISCONN) goto failed; | |
648 | } | |
649 | ||
650 | set_blocking (fd[1]); | |
651 | ||
652 | /* all OK! */ | |
653 | return 0; | |
654 | ||
655 | failed: | |
656 | if (fd[0] != -1) close(fd[0]); | |
657 | if (fd[1] != -1) close(fd[1]); | |
658 | if (listener != -1) close(listener); | |
659 | return -1; | |
660 | } | |
661 | ||
662 | ||
d02984bb MP |
663 | |
664 | /** | |
665 | * Run a program on a local tcp socket, so that we can talk to it's | |
255810c0 MP |
666 | * stdin and stdout. This is used to fake a connection to a daemon |
667 | * for testing -- not for the normal case of running SSH. | |
d02984bb MP |
668 | * |
669 | * @return a socket which is attached to a subprocess running | |
670 | * "prog". stdin and stdout are attached. stderr is left attached to | |
671 | * the original stderr | |
672 | **/ | |
eecd22ff MP |
673 | int sock_exec(const char *prog) |
674 | { | |
675 | int fd[2]; | |
5d264037 | 676 | |
eecd22ff MP |
677 | if (socketpair_tcp(fd) != 0) { |
678 | rprintf (FERROR, RSYNC_NAME | |
679 | ": socketpair_tcp failed (%s)\n", | |
680 | strerror(errno)); | |
681 | return -1; | |
682 | } | |
683 | if (fork() == 0) { | |
684 | close(fd[0]); | |
685 | close(0); | |
686 | close(1); | |
687 | dup(fd[1]); | |
688 | dup(fd[1]); | |
5d264037 MP |
689 | if (verbose > 3) { |
690 | /* Can't use rprintf because we've forked. */ | |
eecd22ff MP |
691 | fprintf (stderr, |
692 | RSYNC_NAME ": execute socket program \"%s\"\n", | |
693 | prog); | |
5d264037 | 694 | } |
eecd22ff MP |
695 | exit (system (prog)); |
696 | } | |
697 | close (fd[1]); | |
698 | return fd[0]; | |
699 | } | |
700 | ||
701 | ||
702 |