Commit | Line | Data |
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7c1b4daa | 1 | /* -*- c-file-style: "linux" -*- |
9c07d253 | 2 | |
d54765c4 | 3 | rsync -- fast file replication program |
9c07d253 | 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> |
9c07d253 | 7 | |
bc2e93eb AT |
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. | |
9c07d253 | 12 | |
bc2e93eb AT |
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. | |
9c07d253 | 17 | |
bc2e93eb AT |
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 | |
9c07d253 | 25 | * |
d5d4b282 | 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); |
9c07d253 | 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 | ||
9c07d253 | 53 | for (cp = buffer; cp < &buffer[sizeof (buffer) - 1]; cp++) { |
4c3b4b25 | 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 | } | |
9c07d253 | 73 | for (cp = &buffer[5]; isdigit(*(uchar*)cp) || *cp == '.'; cp++) {} |
4c3b4b25 AT |
74 | while (*cp == ' ') |
75 | cp++; | |
76 | if (*cp != '2') { | |
77 | rprintf(FERROR, "bad response from proxy - %s\n", | |
78 | buffer); | |
79 | return -1; | |
80 | } | |
81 | /* throw away the rest of the HTTP header */ | |
82 | while (1) { | |
e028b9ff | 83 | for (cp = buffer; cp < &buffer[sizeof (buffer) - 1]; cp++) { |
4c3b4b25 | 84 | if (read(fd, cp, 1) != 1) { |
660c6fbd MP |
85 | rprintf(FERROR, "failed to read from proxy: %s\n", |
86 | strerror(errno)); | |
4c3b4b25 AT |
87 | return -1; |
88 | } | |
89 | if (*cp == '\n') | |
90 | break; | |
91 | } | |
9c07d253 | 92 | if (cp > buffer && *cp == '\n') |
4c3b4b25 | 93 | cp--; |
9c07d253 | 94 | if (cp == buffer && (*cp == '\n' || *cp == '\r')) |
4c3b4b25 AT |
95 | break; |
96 | } | |
97 | return 0; | |
98 | } | |
99 | ||
100 | ||
f8be7d42 MP |
101 | /** |
102 | * Try to set the local address for a newly-created socket. Return -1 | |
103 | * if this fails. | |
104 | **/ | |
e028b9ff | 105 | int try_bind_local(int s, int ai_family, int ai_socktype, |
f8be7d42 MP |
106 | const char *bind_address) |
107 | { | |
108 | int error; | |
109 | struct addrinfo bhints, *bres_all, *r; | |
110 | ||
111 | memset(&bhints, 0, sizeof(bhints)); | |
112 | bhints.ai_family = ai_family; | |
113 | bhints.ai_socktype = ai_socktype; | |
114 | bhints.ai_flags = AI_PASSIVE; | |
98355b80 | 115 | if ((error = getaddrinfo(bind_address, NULL, &bhints, &bres_all))) { |
f8be7d42 MP |
116 | rprintf(FERROR, RSYNC_NAME ": getaddrinfo %s: %s\n", |
117 | bind_address, gai_strerror(error)); | |
118 | return -1; | |
119 | } | |
120 | ||
121 | for (r = bres_all; r; r = r->ai_next) { | |
9ec75284 | 122 | if (bind(s, r->ai_addr, r->ai_addrlen) == -1) |
f8be7d42 | 123 | continue; |
6b2d24de | 124 | freeaddrinfo(bres_all); |
f8be7d42 MP |
125 | return s; |
126 | } | |
127 | ||
128 | /* no error message; there might be some problem that allows | |
129 | * creation of the socket but not binding, perhaps if the | |
130 | * machine has no ipv6 address of this name. */ | |
6b2d24de | 131 | freeaddrinfo(bres_all); |
f8be7d42 MP |
132 | return -1; |
133 | } | |
134 | ||
eecd22ff | 135 | |
d5d4b282 MP |
136 | /** |
137 | * Open a socket to a tcp remote host with the specified port . | |
06963d0f | 138 | * |
d5d4b282 MP |
139 | * Based on code from Warren. Proxy support by Stephen Rothwell. |
140 | * getaddrinfo() rewrite contributed by KAME.net. | |
06963d0f | 141 | * |
d5d4b282 MP |
142 | * Now that we support IPv6 we need to look up the remote machine's |
143 | * address first, using @p af_hint to set a preference for the type | |
144 | * of address. Then depending on whether it has v4 or v6 addresses we | |
145 | * try to open a connection. | |
06963d0f | 146 | * |
d5d4b282 MP |
147 | * The loop allows for machines with some addresses which may not be |
148 | * reachable, perhaps because we can't e.g. route ipv6 to that network | |
149 | * but we can get ip4 packets through. | |
150 | * | |
151 | * @param bind_address Local address to use. Normally NULL to bind | |
152 | * the wildcard address. | |
153 | * | |
154 | * @param af_hint Address family, e.g. AF_INET or AF_INET6. | |
06963d0f | 155 | **/ |
d5d4b282 MP |
156 | int open_socket_out(char *host, int port, const char *bind_address, |
157 | int af_hint) | |
bc2e93eb | 158 | { |
f0fca04e | 159 | int type = SOCK_STREAM; |
06963d0f MP |
160 | int error; |
161 | int s; | |
06963d0f MP |
162 | struct addrinfo hints, *res0, *res; |
163 | char portbuf[10]; | |
4c3b4b25 | 164 | char *h; |
4c3b4b25 AT |
165 | int proxied = 0; |
166 | char buffer[1024]; | |
167 | char *cp; | |
168 | ||
660c6fbd MP |
169 | /* if we have a RSYNC_PROXY env variable then redirect our |
170 | * connetcion via a web proxy at the given address. The format | |
171 | * is hostname:port */ | |
4c3b4b25 | 172 | h = getenv("RSYNC_PROXY"); |
9c07d253 | 173 | proxied = h != NULL && *h != '\0'; |
4c3b4b25 AT |
174 | |
175 | if (proxied) { | |
176 | strlcpy(buffer, h, sizeof(buffer)); | |
177 | cp = strchr(buffer, ':'); | |
178 | if (cp == NULL) { | |
660c6fbd MP |
179 | rprintf(FERROR, |
180 | "invalid proxy specification: should be HOST:PORT\n"); | |
4c3b4b25 AT |
181 | return -1; |
182 | } | |
183 | *cp++ = '\0'; | |
06963d0f | 184 | strcpy(portbuf, cp); |
4c3b4b25 | 185 | h = buffer; |
7bea78ce MP |
186 | if (verbose >= 2) { |
187 | rprintf(FINFO, "connection via http proxy %s port %s\n", | |
188 | h, portbuf); | |
189 | } | |
4c3b4b25 | 190 | } else { |
06963d0f | 191 | snprintf(portbuf, sizeof(portbuf), "%d", port); |
4c3b4b25 | 192 | h = host; |
4c3b4b25 | 193 | } |
f0fca04e | 194 | |
06963d0f | 195 | memset(&hints, 0, sizeof(hints)); |
d5d4b282 | 196 | hints.ai_family = af_hint; |
06963d0f MP |
197 | hints.ai_socktype = type; |
198 | error = getaddrinfo(h, portbuf, &hints, &res0); | |
199 | if (error) { | |
d5d4b282 MP |
200 | rprintf(FERROR, RSYNC_NAME ": getaddrinfo: %s %s: %s\n", |
201 | h, portbuf, gai_strerror(error)); | |
f0fca04e AT |
202 | return -1; |
203 | } | |
204 | ||
06963d0f | 205 | s = -1; |
2d6dbe29 MP |
206 | /* Try to connect to all addresses for this machine until we get |
207 | * through. It might e.g. be multi-homed, or have both IPv4 and IPv6 | |
208 | * addresses. We need to create a socket for each record, since the | |
209 | * address record tells us what protocol to use to try to connect. */ | |
06963d0f MP |
210 | for (res = res0; res; res = res->ai_next) { |
211 | s = socket(res->ai_family, res->ai_socktype, res->ai_protocol); | |
212 | if (s < 0) | |
213 | continue; | |
f0fca04e | 214 | |
f8be7d42 MP |
215 | if (bind_address) |
216 | if (try_bind_local(s, res->ai_family, type, | |
217 | bind_address) == -1) { | |
218 | close(s); | |
219 | s = -1; | |
06963d0f MP |
220 | continue; |
221 | } | |
e30f0657 | 222 | |
06963d0f MP |
223 | if (connect(s, res->ai_addr, res->ai_addrlen) < 0) { |
224 | close(s); | |
225 | s = -1; | |
226 | continue; | |
227 | } | |
228 | if (proxied && | |
229 | establish_proxy_connection(s, host, port) != 0) { | |
230 | close(s); | |
231 | s = -1; | |
232 | continue; | |
233 | } else | |
234 | break; | |
4c3b4b25 | 235 | } |
06963d0f MP |
236 | freeaddrinfo(res0); |
237 | if (s < 0) { | |
7ef6aa64 MP |
238 | rprintf(FERROR, RSYNC_NAME ": failed to connect to %s: %s\n", |
239 | h, strerror(errno)); | |
f0fca04e AT |
240 | return -1; |
241 | } | |
06963d0f | 242 | return s; |
f0fca04e AT |
243 | } |
244 | ||
245 | ||
eecd22ff MP |
246 | /** |
247 | * Open an outgoing socket, but allow for it to be intercepted by | |
248 | * $RSYNC_CONNECT_PROG, which will execute a program across a TCP | |
249 | * socketpair rather than really opening a socket. | |
250 | * | |
251 | * We use this primarily in testing to detect TCP flow bugs, but not | |
252 | * cause security problems by really opening remote connections. | |
253 | * | |
254 | * This is based on the Samba LIBSMB_PROG feature. | |
06963d0f MP |
255 | * |
256 | * @param bind_address Local address to use. Normally NULL to get the stack default. | |
eecd22ff | 257 | **/ |
9c07d253 WD |
258 | int open_socket_out_wrapped(char *host, int port, const char *bind_address, |
259 | int af_hint) | |
eecd22ff MP |
260 | { |
261 | char *prog; | |
262 | ||
9c07d253 WD |
263 | if ((prog = getenv("RSYNC_CONNECT_PROG")) != NULL) |
264 | return sock_exec(prog); | |
265 | return open_socket_out(host, port, bind_address, af_hint); | |
eecd22ff MP |
266 | } |
267 | ||
268 | ||
269 | ||
06963d0f MP |
270 | /** |
271 | * Open a socket of the specified type, port and address for incoming data | |
272 | * | |
b8771f96 MP |
273 | * Try to be better about handling the results of getaddrinfo(): when |
274 | * opening an inbound socket, we might get several address results, | |
9c07d253 WD |
275 | * e.g. for the machine's ipv4 and ipv6 name. |
276 | * | |
b8771f96 MP |
277 | * If binding a wildcard, then any one of them should do. If an address |
278 | * was specified but it's insufficiently specific then that's not our | |
9c07d253 WD |
279 | * fault. |
280 | * | |
b8771f96 MP |
281 | * However, some of the advertized addresses may not work because e.g. we |
282 | * don't have IPv6 support in the kernel. In that case go on and try all | |
283 | * addresses until one succeeds. | |
9c07d253 | 284 | * |
06963d0f MP |
285 | * @param bind_address Local address to bind, or NULL to allow it to |
286 | * default. | |
287 | **/ | |
d5d4b282 MP |
288 | static int open_socket_in(int type, int port, const char *bind_address, |
289 | int af_hint) | |
f0fca04e | 290 | { |
f0fca04e | 291 | int one=1; |
06963d0f | 292 | int s; |
13e29995 | 293 | struct addrinfo hints, *all_ai, *resp; |
06963d0f MP |
294 | char portbuf[10]; |
295 | int error; | |
296 | ||
297 | memset(&hints, 0, sizeof(hints)); | |
d5d4b282 | 298 | hints.ai_family = af_hint; |
06963d0f MP |
299 | hints.ai_socktype = type; |
300 | hints.ai_flags = AI_PASSIVE; | |
301 | snprintf(portbuf, sizeof(portbuf), "%d", port); | |
13e29995 | 302 | error = getaddrinfo(bind_address, portbuf, &hints, &all_ai); |
06963d0f | 303 | if (error) { |
7ef6aa64 MP |
304 | rprintf(FERROR, RSYNC_NAME ": getaddrinfo: bind address %s: %s\n", |
305 | bind_address, gai_strerror(error)); | |
06963d0f MP |
306 | return -1; |
307 | } | |
06963d0f | 308 | |
13e29995 MP |
309 | /* We may not be able to create the socket, if for example the |
310 | * machine knows about IPv6 in the C library, but not in the | |
311 | * kernel. */ | |
312 | for (resp = all_ai; resp; resp = resp->ai_next) { | |
313 | s = socket(resp->ai_family, resp->ai_socktype, | |
314 | resp->ai_protocol); | |
315 | ||
9c07d253 | 316 | if (s == -1) |
13e29995 MP |
317 | /* See if there's another address that will work... */ |
318 | continue; | |
9c07d253 | 319 | |
13e29995 MP |
320 | setsockopt(s, SOL_SOCKET, SO_REUSEADDR, |
321 | (char *)&one, sizeof one); | |
9c07d253 | 322 | |
e028b9ff WD |
323 | /* Now we've got a socket - we need to bind it. */ |
324 | if (bind(s, resp->ai_addr, resp->ai_addrlen) < 0) { | |
13e29995 MP |
325 | /* Nope, try another */ |
326 | close(s); | |
327 | continue; | |
b8771f96 | 328 | } |
e23d790f | 329 | |
6b2d24de | 330 | freeaddrinfo(all_ai); |
13e29995 | 331 | return s; |
f0fca04e AT |
332 | } |
333 | ||
13e29995 MP |
334 | rprintf(FERROR, RSYNC_NAME ": open inbound socket on port %d failed: " |
335 | "%s\n", | |
9c07d253 | 336 | port, |
13e29995 | 337 | strerror(errno)); |
b8771f96 | 338 | |
13e29995 | 339 | freeaddrinfo(all_ai); |
9c07d253 | 340 | return -1; |
f0fca04e AT |
341 | } |
342 | ||
343 | ||
7c1b4daa MP |
344 | /* |
345 | * Determine if a file descriptor is in fact a socket | |
346 | */ | |
f0fca04e AT |
347 | int is_a_socket(int fd) |
348 | { | |
ac2a1a44 MP |
349 | int v; |
350 | socklen_t l; | |
3eb38818 | 351 | l = sizeof(int); |
7c1b4daa MP |
352 | |
353 | /* Parameters to getsockopt, setsockopt etc are very | |
354 | * unstandardized across platforms, so don't be surprised if | |
ac2a1a44 MP |
355 | * there are compiler warnings on e.g. SCO OpenSwerver or AIX. |
356 | * It seems they all eventually get the right idea. | |
7c1b4daa MP |
357 | * |
358 | * Debian says: ``The fifth argument of getsockopt and | |
359 | * setsockopt is in reality an int [*] (and this is what BSD | |
360 | * 4.* and libc4 and libc5 have). Some POSIX confusion | |
361 | * resulted in the present socklen_t. The draft standard has | |
362 | * not been adopted yet, but glibc2 already follows it and | |
363 | * also has socklen_t [*]. See also accept(2).'' | |
364 | * | |
365 | * We now return to your regularly scheduled programming. */ | |
9c07d253 | 366 | return getsockopt(fd, SOL_SOCKET, SO_TYPE, (char *)&v, &l) == 0; |
f0fca04e AT |
367 | } |
368 | ||
369 | ||
067669da WD |
370 | static RETSIGTYPE sigchld_handler(UNUSED(int val)) |
371 | { | |
ca20c7fd WD |
372 | signal(SIGCHLD, sigchld_handler); |
373 | #ifdef WNOHANG | |
374 | while (waitpid(-1, NULL, WNOHANG) > 0) {} | |
375 | #endif | |
376 | } | |
377 | ||
378 | ||
39993af5 | 379 | void start_accept_loop(int port, int (*fn)(int, int)) |
f0fca04e AT |
380 | { |
381 | int s; | |
06963d0f | 382 | extern char *bind_address; |
13e29995 | 383 | extern int default_af_hint; |
f0fca04e | 384 | |
f0fca04e | 385 | /* open an incoming socket */ |
13e29995 | 386 | s = open_socket_in(SOCK_STREAM, port, bind_address, default_af_hint); |
f0fca04e | 387 | if (s == -1) |
65417579 | 388 | exit_cleanup(RERR_SOCKETIO); |
f0fca04e AT |
389 | |
390 | /* ready to listen */ | |
391 | if (listen(s, 5) == -1) { | |
392 | close(s); | |
65417579 | 393 | exit_cleanup(RERR_SOCKETIO); |
f0fca04e AT |
394 | } |
395 | ||
396 | ||
397 | /* now accept incoming connections - forking a new process | |
398 | for each incoming connection */ | |
399 | while (1) { | |
400 | fd_set fds; | |
c4a5c57d | 401 | pid_t pid; |
f0fca04e | 402 | int fd; |
2d6dbe29 | 403 | struct sockaddr_storage addr; |
d54765c4 | 404 | socklen_t addrlen = sizeof addr; |
f0fca04e | 405 | |
15b84e14 DD |
406 | /* close log file before the potentially very long select so |
407 | file can be trimmed by another process instead of growing | |
408 | forever */ | |
409 | log_close(); | |
45a83540 | 410 | |
f0fca04e AT |
411 | FD_ZERO(&fds); |
412 | FD_SET(s, &fds); | |
413 | ||
9c07d253 | 414 | if (select(s+1, &fds, NULL, NULL, NULL) != 1) |
f0fca04e | 415 | continue; |
f0fca04e | 416 | |
9c07d253 WD |
417 | if (!FD_ISSET(s, &fds)) |
418 | continue; | |
f0fca04e | 419 | |
2d6dbe29 | 420 | fd = accept(s,(struct sockaddr *)&addr,&addrlen); |
f0fca04e | 421 | |
9c07d253 WD |
422 | if (fd == -1) |
423 | continue; | |
f0fca04e | 424 | |
ca20c7fd | 425 | signal(SIGCHLD, sigchld_handler); |
31f440e6 | 426 | |
c4a5c57d | 427 | if ((pid = fork()) == 0) { |
9f639210 | 428 | int ret; |
f0fca04e | 429 | close(s); |
15b84e14 DD |
430 | /* open log file in child before possibly giving |
431 | up privileges */ | |
432 | log_open(); | |
9f639210 DD |
433 | ret = fn(fd, fd); |
434 | close_all(); | |
435 | _exit(ret); | |
c4a5c57d MP |
436 | } else if (pid < 0) { |
437 | rprintf(FERROR, | |
438 | RSYNC_NAME | |
439 | ": could not create child server process: %s\n", | |
440 | strerror(errno)); | |
441 | close(fd); | |
442 | /* This might have happened because we're | |
443 | * overloaded. Sleep briefly before trying to | |
444 | * accept again. */ | |
445 | sleep(2); | |
bd37c666 | 446 | } else { |
79845f28 | 447 | /* Parent doesn't need this fd anymore. */ |
bd37c666 | 448 | close(fd); |
f0fca04e | 449 | } |
f0fca04e | 450 | } |
f0fca04e AT |
451 | } |
452 | ||
453 | ||
454 | enum SOCK_OPT_TYPES {OPT_BOOL,OPT_INT,OPT_ON}; | |
455 | ||
456 | struct | |
457 | { | |
458 | char *name; | |
459 | int level; | |
460 | int option; | |
461 | int value; | |
462 | int opttype; | |
463 | } socket_options[] = { | |
464 | {"SO_KEEPALIVE", SOL_SOCKET, SO_KEEPALIVE, 0, OPT_BOOL}, | |
465 | {"SO_REUSEADDR", SOL_SOCKET, SO_REUSEADDR, 0, OPT_BOOL}, | |
466 | {"SO_BROADCAST", SOL_SOCKET, SO_BROADCAST, 0, OPT_BOOL}, | |
467 | #ifdef TCP_NODELAY | |
468 | {"TCP_NODELAY", IPPROTO_TCP, TCP_NODELAY, 0, OPT_BOOL}, | |
469 | #endif | |
470 | #ifdef IPTOS_LOWDELAY | |
471 | {"IPTOS_LOWDELAY", IPPROTO_IP, IP_TOS, IPTOS_LOWDELAY, OPT_ON}, | |
472 | #endif | |
473 | #ifdef IPTOS_THROUGHPUT | |
474 | {"IPTOS_THROUGHPUT", IPPROTO_IP, IP_TOS, IPTOS_THROUGHPUT, OPT_ON}, | |
475 | #endif | |
476 | #ifdef SO_SNDBUF | |
477 | {"SO_SNDBUF", SOL_SOCKET, SO_SNDBUF, 0, OPT_INT}, | |
478 | #endif | |
479 | #ifdef SO_RCVBUF | |
480 | {"SO_RCVBUF", SOL_SOCKET, SO_RCVBUF, 0, OPT_INT}, | |
481 | #endif | |
482 | #ifdef SO_SNDLOWAT | |
483 | {"SO_SNDLOWAT", SOL_SOCKET, SO_SNDLOWAT, 0, OPT_INT}, | |
484 | #endif | |
485 | #ifdef SO_RCVLOWAT | |
486 | {"SO_RCVLOWAT", SOL_SOCKET, SO_RCVLOWAT, 0, OPT_INT}, | |
487 | #endif | |
488 | #ifdef SO_SNDTIMEO | |
489 | {"SO_SNDTIMEO", SOL_SOCKET, SO_SNDTIMEO, 0, OPT_INT}, | |
490 | #endif | |
491 | #ifdef SO_RCVTIMEO | |
492 | {"SO_RCVTIMEO", SOL_SOCKET, SO_RCVTIMEO, 0, OPT_INT}, | |
493 | #endif | |
494 | {NULL,0,0,0,0}}; | |
495 | ||
9c07d253 | 496 | |
f0fca04e | 497 | |
a7dc44d2 MP |
498 | /** |
499 | * Set user socket options | |
500 | **/ | |
f0fca04e AT |
501 | void set_socket_options(int fd, char *options) |
502 | { | |
503 | char *tok; | |
9c07d253 WD |
504 | |
505 | if (!options || !*options) | |
506 | return; | |
a6801c39 | 507 | |
f0fca04e | 508 | options = strdup(options); |
f0fca04e | 509 | |
9c07d253 WD |
510 | if (!options) |
511 | out_of_memory("set_socket_options"); | |
512 | ||
513 | for (tok = strtok(options, " \t,"); tok; tok = strtok(NULL," \t,")) { | |
f0fca04e AT |
514 | int ret=0,i; |
515 | int value = 1; | |
516 | char *p; | |
517 | int got_value = 0; | |
518 | ||
519 | if ((p = strchr(tok,'='))) { | |
520 | *p = 0; | |
521 | value = atoi(p+1); | |
522 | got_value = 1; | |
523 | } | |
524 | ||
9c07d253 | 525 | for (i = 0; socket_options[i].name; i++) { |
f0fca04e AT |
526 | if (strcmp(socket_options[i].name,tok)==0) |
527 | break; | |
9c07d253 | 528 | } |
f0fca04e AT |
529 | |
530 | if (!socket_options[i].name) { | |
531 | rprintf(FERROR,"Unknown socket option %s\n",tok); | |
532 | continue; | |
533 | } | |
534 | ||
535 | switch (socket_options[i].opttype) { | |
536 | case OPT_BOOL: | |
537 | case OPT_INT: | |
538 | ret = setsockopt(fd,socket_options[i].level, | |
539 | socket_options[i].option,(char *)&value,sizeof(int)); | |
540 | break; | |
9c07d253 | 541 | |
f0fca04e AT |
542 | case OPT_ON: |
543 | if (got_value) | |
544 | rprintf(FERROR,"syntax error - %s does not take a value\n",tok); | |
545 | ||
546 | { | |
547 | int on = socket_options[i].value; | |
548 | ret = setsockopt(fd,socket_options[i].level, | |
549 | socket_options[i].option,(char *)&on,sizeof(int)); | |
550 | } | |
9c07d253 | 551 | break; |
f0fca04e | 552 | } |
9c07d253 | 553 | |
f0fca04e | 554 | if (ret != 0) |
660c6fbd MP |
555 | rprintf(FERROR, "failed to set socket option %s: %s\n", tok, |
556 | strerror(errno)); | |
f0fca04e AT |
557 | } |
558 | ||
559 | free(options); | |
560 | } | |
561 | ||
a7dc44d2 MP |
562 | /** |
563 | * Become a daemon, discarding the controlling terminal | |
564 | **/ | |
f0fca04e AT |
565 | void become_daemon(void) |
566 | { | |
b11ed3b1 AT |
567 | int i; |
568 | ||
c46ded46 | 569 | if (fork()) { |
f0fca04e | 570 | _exit(0); |
c46ded46 | 571 | } |
f0fca04e AT |
572 | |
573 | /* detach from the terminal */ | |
574 | #ifdef HAVE_SETSID | |
575 | setsid(); | |
576 | #else | |
577 | #ifdef TIOCNOTTY | |
c46ded46 AT |
578 | i = open("/dev/tty", O_RDWR); |
579 | if (i >= 0) { | |
9c07d253 | 580 | ioctl(i, (int)TIOCNOTTY, (char *)0); |
c46ded46 | 581 | close(i); |
f0fca04e AT |
582 | } |
583 | #endif /* TIOCNOTTY */ | |
584 | #endif | |
b11ed3b1 AT |
585 | /* make sure that stdin, stdout an stderr don't stuff things |
586 | up (library functions, for example) */ | |
9c07d253 WD |
587 | for (i = 0; i < 3; i++) { |
588 | close(i); | |
b11ed3b1 AT |
589 | open("/dev/null", O_RDWR); |
590 | } | |
bc2e93eb | 591 | } |
ff8b29b8 | 592 | |
eecd22ff | 593 | |
a7dc44d2 MP |
594 | /** |
595 | * This is like socketpair but uses tcp. It is used by the Samba | |
596 | * regression test code. | |
9c07d253 | 597 | * |
a7dc44d2 MP |
598 | * The function guarantees that nobody else can attach to the socket, |
599 | * or if they do that this function fails and the socket gets closed | |
600 | * returns 0 on success, -1 on failure the resulting file descriptors | |
601 | * are symmetrical. | |
602 | **/ | |
eecd22ff MP |
603 | static int socketpair_tcp(int fd[2]) |
604 | { | |
605 | int listener; | |
606 | struct sockaddr_in sock; | |
607 | struct sockaddr_in sock2; | |
608 | socklen_t socklen = sizeof(sock); | |
609 | int connect_done = 0; | |
9c07d253 | 610 | |
eecd22ff MP |
611 | fd[0] = fd[1] = listener = -1; |
612 | ||
613 | memset(&sock, 0, sizeof(sock)); | |
9c07d253 WD |
614 | |
615 | if ((listener = socket(PF_INET, SOCK_STREAM, 0)) == -1) | |
616 | goto failed; | |
eecd22ff MP |
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 | ||
9c07d253 WD |
626 | if (listen(listener, 1) != 0) |
627 | goto failed; | |
eecd22ff | 628 | |
9c07d253 WD |
629 | if (getsockname(listener, (struct sockaddr *)&sock, &socklen) != 0) |
630 | goto failed; | |
eecd22ff | 631 | |
9c07d253 WD |
632 | if ((fd[1] = socket(PF_INET, SOCK_STREAM, 0)) == -1) |
633 | goto failed; | |
eecd22ff MP |
634 | |
635 | set_nonblocking(fd[1]); | |
636 | ||
637 | sock.sin_addr.s_addr = htonl(INADDR_LOOPBACK); | |
638 | ||
639 | if (connect(fd[1],(struct sockaddr *)&sock,sizeof(sock)) == -1) { | |
9c07d253 WD |
640 | if (errno != EINPROGRESS) |
641 | goto failed; | |
642 | } else | |
eecd22ff | 643 | connect_done = 1; |
eecd22ff | 644 | |
9c07d253 WD |
645 | if ((fd[0] = accept(listener, (struct sockaddr *)&sock, &socklen)) == -1) |
646 | goto failed; | |
eecd22ff MP |
647 | |
648 | close(listener); | |
649 | if (connect_done == 0) { | |
650 | if (connect(fd[1],(struct sockaddr *)&sock,sizeof(sock)) != 0 | |
9c07d253 WD |
651 | && errno != EISCONN) |
652 | goto failed; | |
eecd22ff MP |
653 | } |
654 | ||
9c07d253 | 655 | set_blocking(fd[1]); |
eecd22ff MP |
656 | |
657 | /* all OK! */ | |
658 | return 0; | |
659 | ||
660 | failed: | |
9c07d253 WD |
661 | if (fd[0] != -1) |
662 | close(fd[0]); | |
663 | if (fd[1] != -1) | |
664 | close(fd[1]); | |
665 | if (listener != -1) | |
666 | close(listener); | |
eecd22ff MP |
667 | return -1; |
668 | } | |
669 | ||
670 | ||
d02984bb MP |
671 | |
672 | /** | |
673 | * Run a program on a local tcp socket, so that we can talk to it's | |
255810c0 MP |
674 | * stdin and stdout. This is used to fake a connection to a daemon |
675 | * for testing -- not for the normal case of running SSH. | |
d02984bb MP |
676 | * |
677 | * @return a socket which is attached to a subprocess running | |
678 | * "prog". stdin and stdout are attached. stderr is left attached to | |
679 | * the original stderr | |
680 | **/ | |
eecd22ff MP |
681 | int sock_exec(const char *prog) |
682 | { | |
683 | int fd[2]; | |
9c07d253 | 684 | |
eecd22ff | 685 | if (socketpair_tcp(fd) != 0) { |
9c07d253 WD |
686 | rprintf(FERROR, RSYNC_NAME ": socketpair_tcp failed (%s)\n", |
687 | strerror(errno)); | |
eecd22ff MP |
688 | return -1; |
689 | } | |
690 | if (fork() == 0) { | |
691 | close(fd[0]); | |
692 | close(0); | |
693 | close(1); | |
694 | dup(fd[1]); | |
695 | dup(fd[1]); | |
5d264037 MP |
696 | if (verbose > 3) { |
697 | /* Can't use rprintf because we've forked. */ | |
9c07d253 WD |
698 | fprintf(stderr, |
699 | RSYNC_NAME ": execute socket program \"%s\"\n", | |
700 | prog); | |
5d264037 | 701 | } |
9c07d253 | 702 | exit(system(prog)); |
eecd22ff | 703 | } |
9c07d253 | 704 | close(fd[1]); |
eecd22ff MP |
705 | return fd[0]; |
706 | } |