Commit | Line | Data |
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7c1b4daa MP |
1 | /* -*- c-file-style: "linux" -*- |
2 | ||
eecd22ff | 3 | Copyright (C) 1992-2001 by Andrew Tridgell <tridge@samba.org> |
362099a5 | 4 | Copyright (C) 2001, 2002 by Martin Pool <mbp@samba.org> |
bc2e93eb AT |
5 | |
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with this program; if not, write to the Free Software | |
18 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
19 | */ | |
20 | ||
d5d4b282 MP |
21 | /** |
22 | * @file socket.c | |
23 | * | |
24 | * Socket functions used in rsync. | |
362099a5 MP |
25 | * |
26 | * This file is now converted to use the new-style getaddrinfo() | |
27 | * interface, which supports IPv6 but is also supported on recent | |
28 | * IPv4-only machines. On systems that don't have that interface, we | |
29 | * emulate it using the KAME implementation. | |
d5d4b282 | 30 | **/ |
bc2e93eb | 31 | |
f0fca04e AT |
32 | #include "rsync.h" |
33 | ||
660c6fbd MP |
34 | /* Establish a proxy connection on an open socket to a web roxy by |
35 | * using the CONNECT method. */ | |
4c3b4b25 AT |
36 | static int establish_proxy_connection(int fd, char *host, int port) |
37 | { | |
38 | char buffer[1024]; | |
39 | char *cp; | |
40 | ||
8950ac03 | 41 | snprintf(buffer, sizeof(buffer), "CONNECT %s:%d HTTP/1.0\r\n\r\n", host, port); |
4c3b4b25 | 42 | if (write(fd, buffer, strlen(buffer)) != strlen(buffer)) { |
660c6fbd | 43 | rprintf(FERROR, "failed to write to proxy: %s\n", |
4c3b4b25 AT |
44 | strerror(errno)); |
45 | return -1; | |
46 | } | |
47 | ||
48 | for (cp = buffer; cp < &buffer[sizeof(buffer) - 1]; cp++) { | |
49 | if (read(fd, cp, 1) != 1) { | |
660c6fbd MP |
50 | rprintf(FERROR, "failed to read from proxy: %s\n", |
51 | strerror(errno)); | |
4c3b4b25 AT |
52 | return -1; |
53 | } | |
54 | if (*cp == '\n') | |
55 | break; | |
56 | } | |
57 | ||
58 | if (*cp != '\n') | |
59 | cp++; | |
60 | *cp-- = '\0'; | |
61 | if (*cp == '\r') | |
62 | *cp = '\0'; | |
63 | if (strncmp(buffer, "HTTP/", 5) != 0) { | |
64 | rprintf(FERROR, "bad response from proxy - %s\n", | |
65 | buffer); | |
66 | return -1; | |
67 | } | |
68 | for (cp = &buffer[5]; isdigit(*cp) || (*cp == '.'); cp++) | |
69 | ; | |
70 | while (*cp == ' ') | |
71 | cp++; | |
72 | if (*cp != '2') { | |
73 | rprintf(FERROR, "bad response from proxy - %s\n", | |
74 | buffer); | |
75 | return -1; | |
76 | } | |
77 | /* throw away the rest of the HTTP header */ | |
78 | while (1) { | |
79 | for (cp = buffer; cp < &buffer[sizeof(buffer) - 1]; | |
80 | cp++) { | |
81 | if (read(fd, cp, 1) != 1) { | |
660c6fbd MP |
82 | rprintf(FERROR, "failed to read from proxy: %s\n", |
83 | strerror(errno)); | |
4c3b4b25 AT |
84 | return -1; |
85 | } | |
86 | if (*cp == '\n') | |
87 | break; | |
88 | } | |
89 | if ((cp > buffer) && (*cp == '\n')) | |
90 | cp--; | |
91 | if ((cp == buffer) && ((*cp == '\n') || (*cp == '\r'))) | |
92 | break; | |
93 | } | |
94 | return 0; | |
95 | } | |
96 | ||
97 | ||
f8be7d42 MP |
98 | /** |
99 | * Try to set the local address for a newly-created socket. Return -1 | |
100 | * if this fails. | |
101 | **/ | |
102 | int try_bind_local(int s, | |
103 | int ai_family, int ai_socktype, | |
104 | const char *bind_address) | |
105 | { | |
106 | int error; | |
107 | struct addrinfo bhints, *bres_all, *r; | |
108 | ||
109 | memset(&bhints, 0, sizeof(bhints)); | |
110 | bhints.ai_family = ai_family; | |
111 | bhints.ai_socktype = ai_socktype; | |
112 | bhints.ai_flags = AI_PASSIVE; | |
98355b80 | 113 | if ((error = getaddrinfo(bind_address, NULL, &bhints, &bres_all))) { |
f8be7d42 MP |
114 | rprintf(FERROR, RSYNC_NAME ": getaddrinfo %s: %s\n", |
115 | bind_address, gai_strerror(error)); | |
116 | return -1; | |
117 | } | |
118 | ||
119 | for (r = bres_all; r; r = r->ai_next) { | |
9ec75284 | 120 | if (bind(s, r->ai_addr, r->ai_addrlen) == -1) |
f8be7d42 MP |
121 | continue; |
122 | return s; | |
123 | } | |
124 | ||
125 | /* no error message; there might be some problem that allows | |
126 | * creation of the socket but not binding, perhaps if the | |
127 | * machine has no ipv6 address of this name. */ | |
128 | return -1; | |
129 | } | |
130 | ||
eecd22ff | 131 | |
d5d4b282 MP |
132 | /** |
133 | * Open a socket to a tcp remote host with the specified port . | |
06963d0f | 134 | * |
d5d4b282 MP |
135 | * Based on code from Warren. Proxy support by Stephen Rothwell. |
136 | * getaddrinfo() rewrite contributed by KAME.net. | |
06963d0f | 137 | * |
d5d4b282 MP |
138 | * Now that we support IPv6 we need to look up the remote machine's |
139 | * address first, using @p af_hint to set a preference for the type | |
140 | * of address. Then depending on whether it has v4 or v6 addresses we | |
141 | * try to open a connection. | |
06963d0f | 142 | * |
d5d4b282 MP |
143 | * The loop allows for machines with some addresses which may not be |
144 | * reachable, perhaps because we can't e.g. route ipv6 to that network | |
145 | * but we can get ip4 packets through. | |
146 | * | |
147 | * @param bind_address Local address to use. Normally NULL to bind | |
148 | * the wildcard address. | |
149 | * | |
150 | * @param af_hint Address family, e.g. AF_INET or AF_INET6. | |
06963d0f | 151 | **/ |
d5d4b282 MP |
152 | int open_socket_out(char *host, int port, const char *bind_address, |
153 | int af_hint) | |
bc2e93eb | 154 | { |
f0fca04e | 155 | int type = SOCK_STREAM; |
06963d0f MP |
156 | int error; |
157 | int s; | |
06963d0f MP |
158 | struct addrinfo hints, *res0, *res; |
159 | char portbuf[10]; | |
4c3b4b25 | 160 | char *h; |
4c3b4b25 AT |
161 | int proxied = 0; |
162 | char buffer[1024]; | |
163 | char *cp; | |
164 | ||
660c6fbd MP |
165 | /* if we have a RSYNC_PROXY env variable then redirect our |
166 | * connetcion via a web proxy at the given address. The format | |
167 | * is hostname:port */ | |
4c3b4b25 AT |
168 | h = getenv("RSYNC_PROXY"); |
169 | proxied = (h != NULL) && (*h != '\0'); | |
170 | ||
171 | if (proxied) { | |
172 | strlcpy(buffer, h, sizeof(buffer)); | |
173 | cp = strchr(buffer, ':'); | |
174 | if (cp == NULL) { | |
660c6fbd MP |
175 | rprintf(FERROR, |
176 | "invalid proxy specification: should be HOST:PORT\n"); | |
4c3b4b25 AT |
177 | return -1; |
178 | } | |
179 | *cp++ = '\0'; | |
06963d0f | 180 | strcpy(portbuf, cp); |
4c3b4b25 AT |
181 | h = buffer; |
182 | } else { | |
06963d0f | 183 | snprintf(portbuf, sizeof(portbuf), "%d", port); |
4c3b4b25 | 184 | h = host; |
4c3b4b25 | 185 | } |
f0fca04e | 186 | |
06963d0f | 187 | memset(&hints, 0, sizeof(hints)); |
d5d4b282 | 188 | hints.ai_family = af_hint; |
06963d0f MP |
189 | hints.ai_socktype = type; |
190 | error = getaddrinfo(h, portbuf, &hints, &res0); | |
191 | if (error) { | |
d5d4b282 MP |
192 | rprintf(FERROR, RSYNC_NAME ": getaddrinfo: %s %s: %s\n", |
193 | h, portbuf, gai_strerror(error)); | |
f0fca04e AT |
194 | return -1; |
195 | } | |
196 | ||
06963d0f | 197 | s = -1; |
2d6dbe29 MP |
198 | /* Try to connect to all addresses for this machine until we get |
199 | * through. It might e.g. be multi-homed, or have both IPv4 and IPv6 | |
200 | * addresses. We need to create a socket for each record, since the | |
201 | * address record tells us what protocol to use to try to connect. */ | |
06963d0f MP |
202 | for (res = res0; res; res = res->ai_next) { |
203 | s = socket(res->ai_family, res->ai_socktype, res->ai_protocol); | |
204 | if (s < 0) | |
205 | continue; | |
f0fca04e | 206 | |
f8be7d42 MP |
207 | if (bind_address) |
208 | if (try_bind_local(s, res->ai_family, type, | |
209 | bind_address) == -1) { | |
210 | close(s); | |
211 | s = -1; | |
06963d0f MP |
212 | continue; |
213 | } | |
e30f0657 | 214 | |
06963d0f MP |
215 | if (connect(s, res->ai_addr, res->ai_addrlen) < 0) { |
216 | close(s); | |
217 | s = -1; | |
218 | continue; | |
219 | } | |
220 | if (proxied && | |
221 | establish_proxy_connection(s, host, port) != 0) { | |
222 | close(s); | |
223 | s = -1; | |
224 | continue; | |
225 | } else | |
226 | break; | |
4c3b4b25 | 227 | } |
06963d0f MP |
228 | freeaddrinfo(res0); |
229 | if (s < 0) { | |
7ef6aa64 MP |
230 | rprintf(FERROR, RSYNC_NAME ": failed to connect to %s: %s\n", |
231 | h, strerror(errno)); | |
f0fca04e AT |
232 | return -1; |
233 | } | |
06963d0f | 234 | return s; |
f0fca04e AT |
235 | } |
236 | ||
237 | ||
eecd22ff MP |
238 | /** |
239 | * Open an outgoing socket, but allow for it to be intercepted by | |
240 | * $RSYNC_CONNECT_PROG, which will execute a program across a TCP | |
241 | * socketpair rather than really opening a socket. | |
242 | * | |
243 | * We use this primarily in testing to detect TCP flow bugs, but not | |
244 | * cause security problems by really opening remote connections. | |
245 | * | |
246 | * This is based on the Samba LIBSMB_PROG feature. | |
06963d0f MP |
247 | * |
248 | * @param bind_address Local address to use. Normally NULL to get the stack default. | |
eecd22ff MP |
249 | **/ |
250 | int open_socket_out_wrapped (char *host, | |
251 | int port, | |
d5d4b282 MP |
252 | const char *bind_address, |
253 | int af_hint) | |
eecd22ff MP |
254 | { |
255 | char *prog; | |
256 | ||
257 | if ((prog = getenv ("RSYNC_CONNECT_PROG")) != NULL) | |
258 | return sock_exec (prog); | |
259 | else | |
d5d4b282 MP |
260 | return open_socket_out (host, port, bind_address, |
261 | af_hint); | |
eecd22ff MP |
262 | } |
263 | ||
264 | ||
265 | ||
06963d0f MP |
266 | /** |
267 | * Open a socket of the specified type, port and address for incoming data | |
268 | * | |
b8771f96 MP |
269 | * Try to be better about handling the results of getaddrinfo(): when |
270 | * opening an inbound socket, we might get several address results, | |
271 | * e.g. for the machine's ipv4 and ipv6 name. | |
272 | * | |
273 | * If binding a wildcard, then any one of them should do. If an address | |
274 | * was specified but it's insufficiently specific then that's not our | |
275 | * fault. | |
276 | * | |
277 | * However, some of the advertized addresses may not work because e.g. we | |
278 | * don't have IPv6 support in the kernel. In that case go on and try all | |
279 | * addresses until one succeeds. | |
280 | * | |
06963d0f MP |
281 | * @param bind_address Local address to bind, or NULL to allow it to |
282 | * default. | |
283 | **/ | |
d5d4b282 MP |
284 | static int open_socket_in(int type, int port, const char *bind_address, |
285 | int af_hint) | |
f0fca04e | 286 | { |
f0fca04e | 287 | int one=1; |
06963d0f | 288 | int s; |
13e29995 | 289 | struct addrinfo hints, *all_ai, *resp; |
06963d0f MP |
290 | char portbuf[10]; |
291 | int error; | |
292 | ||
293 | memset(&hints, 0, sizeof(hints)); | |
d5d4b282 | 294 | hints.ai_family = af_hint; |
06963d0f MP |
295 | hints.ai_socktype = type; |
296 | hints.ai_flags = AI_PASSIVE; | |
297 | snprintf(portbuf, sizeof(portbuf), "%d", port); | |
13e29995 | 298 | error = getaddrinfo(bind_address, portbuf, &hints, &all_ai); |
06963d0f | 299 | if (error) { |
7ef6aa64 MP |
300 | rprintf(FERROR, RSYNC_NAME ": getaddrinfo: bind address %s: %s\n", |
301 | bind_address, gai_strerror(error)); | |
06963d0f MP |
302 | return -1; |
303 | } | |
06963d0f | 304 | |
13e29995 MP |
305 | /* We may not be able to create the socket, if for example the |
306 | * machine knows about IPv6 in the C library, but not in the | |
307 | * kernel. */ | |
308 | for (resp = all_ai; resp; resp = resp->ai_next) { | |
309 | s = socket(resp->ai_family, resp->ai_socktype, | |
310 | resp->ai_protocol); | |
311 | ||
312 | if (s == -1) | |
313 | /* See if there's another address that will work... */ | |
314 | continue; | |
315 | ||
316 | setsockopt(s, SOL_SOCKET, SO_REUSEADDR, | |
317 | (char *)&one, sizeof one); | |
318 | ||
319 | /* now we've got a socket - we need to bind it */ | |
320 | if (bind(s, all_ai->ai_addr, all_ai->ai_addrlen) < 0) { | |
321 | /* Nope, try another */ | |
322 | close(s); | |
323 | continue; | |
b8771f96 MP |
324 | } |
325 | ||
13e29995 | 326 | return s; |
f0fca04e AT |
327 | } |
328 | ||
13e29995 MP |
329 | rprintf(FERROR, RSYNC_NAME ": open inbound socket on port %d failed: " |
330 | "%s\n", | |
331 | port, | |
332 | strerror(errno)); | |
b8771f96 | 333 | |
13e29995 | 334 | freeaddrinfo(all_ai); |
b8771f96 | 335 | return -1; |
f0fca04e AT |
336 | } |
337 | ||
338 | ||
7c1b4daa MP |
339 | /* |
340 | * Determine if a file descriptor is in fact a socket | |
341 | */ | |
f0fca04e AT |
342 | int is_a_socket(int fd) |
343 | { | |
ac2a1a44 MP |
344 | int v; |
345 | socklen_t l; | |
3eb38818 | 346 | l = sizeof(int); |
7c1b4daa MP |
347 | |
348 | /* Parameters to getsockopt, setsockopt etc are very | |
349 | * unstandardized across platforms, so don't be surprised if | |
ac2a1a44 MP |
350 | * there are compiler warnings on e.g. SCO OpenSwerver or AIX. |
351 | * It seems they all eventually get the right idea. | |
7c1b4daa MP |
352 | * |
353 | * Debian says: ``The fifth argument of getsockopt and | |
354 | * setsockopt is in reality an int [*] (and this is what BSD | |
355 | * 4.* and libc4 and libc5 have). Some POSIX confusion | |
356 | * resulted in the present socklen_t. The draft standard has | |
357 | * not been adopted yet, but glibc2 already follows it and | |
358 | * also has socklen_t [*]. See also accept(2).'' | |
359 | * | |
360 | * We now return to your regularly scheduled programming. */ | |
3eb38818 | 361 | return(getsockopt(fd, SOL_SOCKET, SO_TYPE, (char *)&v, &l) == 0); |
f0fca04e AT |
362 | } |
363 | ||
364 | ||
8ef4ffd6 | 365 | void start_accept_loop(int port, int (*fn)(int )) |
f0fca04e AT |
366 | { |
367 | int s; | |
06963d0f | 368 | extern char *bind_address; |
13e29995 | 369 | extern int default_af_hint; |
f0fca04e | 370 | |
f0fca04e | 371 | /* open an incoming socket */ |
13e29995 | 372 | s = open_socket_in(SOCK_STREAM, port, bind_address, default_af_hint); |
f0fca04e | 373 | if (s == -1) |
65417579 | 374 | exit_cleanup(RERR_SOCKETIO); |
f0fca04e AT |
375 | |
376 | /* ready to listen */ | |
377 | if (listen(s, 5) == -1) { | |
378 | close(s); | |
65417579 | 379 | exit_cleanup(RERR_SOCKETIO); |
f0fca04e AT |
380 | } |
381 | ||
382 | ||
383 | /* now accept incoming connections - forking a new process | |
384 | for each incoming connection */ | |
385 | while (1) { | |
386 | fd_set fds; | |
387 | int fd; | |
2d6dbe29 MP |
388 | struct sockaddr_storage addr; |
389 | int addrlen = sizeof(addr); | |
f0fca04e | 390 | |
15b84e14 DD |
391 | /* close log file before the potentially very long select so |
392 | file can be trimmed by another process instead of growing | |
393 | forever */ | |
394 | log_close(); | |
45a83540 | 395 | |
f0fca04e AT |
396 | FD_ZERO(&fds); |
397 | FD_SET(s, &fds); | |
398 | ||
399 | if (select(s+1, &fds, NULL, NULL, NULL) != 1) { | |
400 | continue; | |
401 | } | |
402 | ||
403 | if(!FD_ISSET(s, &fds)) continue; | |
404 | ||
2d6dbe29 | 405 | fd = accept(s,(struct sockaddr *)&addr,&addrlen); |
f0fca04e AT |
406 | |
407 | if (fd == -1) continue; | |
408 | ||
31f440e6 AT |
409 | signal(SIGCHLD, SIG_IGN); |
410 | ||
411 | /* we shouldn't have any children left hanging around | |
412 | but I have had reports that on Digital Unix zombies | |
413 | are produced, so this ensures that they are reaped */ | |
414 | #ifdef WNOHANG | |
0503f060 | 415 | while (waitpid(-1, NULL, WNOHANG) > 0); |
31f440e6 AT |
416 | #endif |
417 | ||
f0fca04e AT |
418 | if (fork()==0) { |
419 | close(s); | |
15b84e14 DD |
420 | /* open log file in child before possibly giving |
421 | up privileges */ | |
422 | log_open(); | |
f0fca04e AT |
423 | _exit(fn(fd)); |
424 | } | |
425 | ||
426 | close(fd); | |
427 | } | |
f0fca04e AT |
428 | } |
429 | ||
430 | ||
431 | enum SOCK_OPT_TYPES {OPT_BOOL,OPT_INT,OPT_ON}; | |
432 | ||
433 | struct | |
434 | { | |
435 | char *name; | |
436 | int level; | |
437 | int option; | |
438 | int value; | |
439 | int opttype; | |
440 | } socket_options[] = { | |
441 | {"SO_KEEPALIVE", SOL_SOCKET, SO_KEEPALIVE, 0, OPT_BOOL}, | |
442 | {"SO_REUSEADDR", SOL_SOCKET, SO_REUSEADDR, 0, OPT_BOOL}, | |
443 | {"SO_BROADCAST", SOL_SOCKET, SO_BROADCAST, 0, OPT_BOOL}, | |
444 | #ifdef TCP_NODELAY | |
445 | {"TCP_NODELAY", IPPROTO_TCP, TCP_NODELAY, 0, OPT_BOOL}, | |
446 | #endif | |
447 | #ifdef IPTOS_LOWDELAY | |
448 | {"IPTOS_LOWDELAY", IPPROTO_IP, IP_TOS, IPTOS_LOWDELAY, OPT_ON}, | |
449 | #endif | |
450 | #ifdef IPTOS_THROUGHPUT | |
451 | {"IPTOS_THROUGHPUT", IPPROTO_IP, IP_TOS, IPTOS_THROUGHPUT, OPT_ON}, | |
452 | #endif | |
453 | #ifdef SO_SNDBUF | |
454 | {"SO_SNDBUF", SOL_SOCKET, SO_SNDBUF, 0, OPT_INT}, | |
455 | #endif | |
456 | #ifdef SO_RCVBUF | |
457 | {"SO_RCVBUF", SOL_SOCKET, SO_RCVBUF, 0, OPT_INT}, | |
458 | #endif | |
459 | #ifdef SO_SNDLOWAT | |
460 | {"SO_SNDLOWAT", SOL_SOCKET, SO_SNDLOWAT, 0, OPT_INT}, | |
461 | #endif | |
462 | #ifdef SO_RCVLOWAT | |
463 | {"SO_RCVLOWAT", SOL_SOCKET, SO_RCVLOWAT, 0, OPT_INT}, | |
464 | #endif | |
465 | #ifdef SO_SNDTIMEO | |
466 | {"SO_SNDTIMEO", SOL_SOCKET, SO_SNDTIMEO, 0, OPT_INT}, | |
467 | #endif | |
468 | #ifdef SO_RCVTIMEO | |
469 | {"SO_RCVTIMEO", SOL_SOCKET, SO_RCVTIMEO, 0, OPT_INT}, | |
470 | #endif | |
471 | {NULL,0,0,0,0}}; | |
472 | ||
473 | ||
474 | ||
475 | /**************************************************************************** | |
476 | set user socket options | |
477 | ****************************************************************************/ | |
478 | void set_socket_options(int fd, char *options) | |
479 | { | |
480 | char *tok; | |
a6801c39 AT |
481 | if (!options || !*options) return; |
482 | ||
f0fca04e AT |
483 | options = strdup(options); |
484 | ||
485 | if (!options) out_of_memory("set_socket_options"); | |
486 | ||
487 | for (tok=strtok(options, " \t,"); tok; tok=strtok(NULL," \t,")) { | |
488 | int ret=0,i; | |
489 | int value = 1; | |
490 | char *p; | |
491 | int got_value = 0; | |
492 | ||
493 | if ((p = strchr(tok,'='))) { | |
494 | *p = 0; | |
495 | value = atoi(p+1); | |
496 | got_value = 1; | |
497 | } | |
498 | ||
499 | for (i=0;socket_options[i].name;i++) | |
500 | if (strcmp(socket_options[i].name,tok)==0) | |
501 | break; | |
502 | ||
503 | if (!socket_options[i].name) { | |
504 | rprintf(FERROR,"Unknown socket option %s\n",tok); | |
505 | continue; | |
506 | } | |
507 | ||
508 | switch (socket_options[i].opttype) { | |
509 | case OPT_BOOL: | |
510 | case OPT_INT: | |
511 | ret = setsockopt(fd,socket_options[i].level, | |
512 | socket_options[i].option,(char *)&value,sizeof(int)); | |
513 | break; | |
514 | ||
515 | case OPT_ON: | |
516 | if (got_value) | |
517 | rprintf(FERROR,"syntax error - %s does not take a value\n",tok); | |
518 | ||
519 | { | |
520 | int on = socket_options[i].value; | |
521 | ret = setsockopt(fd,socket_options[i].level, | |
522 | socket_options[i].option,(char *)&on,sizeof(int)); | |
523 | } | |
524 | break; | |
525 | } | |
526 | ||
527 | if (ret != 0) | |
660c6fbd MP |
528 | rprintf(FERROR, "failed to set socket option %s: %s\n", tok, |
529 | strerror(errno)); | |
f0fca04e AT |
530 | } |
531 | ||
532 | free(options); | |
533 | } | |
534 | ||
535 | /**************************************************************************** | |
536 | become a daemon, discarding the controlling terminal | |
537 | ****************************************************************************/ | |
538 | void become_daemon(void) | |
539 | { | |
b11ed3b1 AT |
540 | int i; |
541 | ||
c46ded46 | 542 | if (fork()) { |
f0fca04e | 543 | _exit(0); |
c46ded46 | 544 | } |
f0fca04e AT |
545 | |
546 | /* detach from the terminal */ | |
547 | #ifdef HAVE_SETSID | |
548 | setsid(); | |
549 | #else | |
550 | #ifdef TIOCNOTTY | |
c46ded46 AT |
551 | i = open("/dev/tty", O_RDWR); |
552 | if (i >= 0) { | |
553 | ioctl(i, (int) TIOCNOTTY, (char *)0); | |
554 | close(i); | |
f0fca04e AT |
555 | } |
556 | #endif /* TIOCNOTTY */ | |
557 | #endif | |
b11ed3b1 AT |
558 | /* make sure that stdin, stdout an stderr don't stuff things |
559 | up (library functions, for example) */ | |
560 | for (i=0;i<3;i++) { | |
561 | close(i); | |
562 | open("/dev/null", O_RDWR); | |
563 | } | |
bc2e93eb | 564 | } |
ff8b29b8 | 565 | |
1f0fa931 MP |
566 | /** |
567 | * Return the IP addr of the client as a string | |
568 | **/ | |
ff8b29b8 AT |
569 | char *client_addr(int fd) |
570 | { | |
2d6dbe29 | 571 | struct sockaddr_storage ss; |
06963d0f | 572 | int length = sizeof(ss); |
ff8b29b8 | 573 | static char addr_buf[100]; |
11a5a3c7 AT |
574 | static int initialised; |
575 | ||
576 | if (initialised) return addr_buf; | |
577 | ||
578 | initialised = 1; | |
ff8b29b8 | 579 | |
2d6dbe29 | 580 | if (getpeername(fd, (struct sockaddr *)&ss, &length)) { |
65417579 | 581 | exit_cleanup(RERR_SOCKETIO); |
ff8b29b8 | 582 | } |
06963d0f | 583 | |
2d6dbe29 | 584 | getnameinfo((struct sockaddr *)&ss, length, |
06963d0f | 585 | addr_buf, sizeof(addr_buf), NULL, 0, NI_NUMERICHOST); |
ff8b29b8 AT |
586 | return addr_buf; |
587 | } | |
588 | ||
589 | ||
51f289d1 | 590 | static int get_sockaddr_family(const struct sockaddr_storage *ss) |
d91c8c50 MP |
591 | { |
592 | return ((struct sockaddr *) ss)->sa_family; | |
593 | } | |
594 | ||
595 | ||
1f0fa931 MP |
596 | /** |
597 | * Return the DNS name of the client | |
598 | **/ | |
ff8b29b8 AT |
599 | char *client_name(int fd) |
600 | { | |
2d6dbe29 | 601 | struct sockaddr_storage ss; |
06963d0f | 602 | int length = sizeof(ss); |
ff8b29b8 | 603 | static char name_buf[100]; |
06963d0f | 604 | static char port_buf[100]; |
de5fb374 | 605 | char *def = "UNKNOWN"; |
11a5a3c7 | 606 | static int initialised; |
06963d0f MP |
607 | struct addrinfo hints, *res, *res0; |
608 | int error; | |
11a5a3c7 AT |
609 | |
610 | if (initialised) return name_buf; | |
611 | ||
612 | initialised = 1; | |
ff8b29b8 | 613 | |
de5fb374 | 614 | strcpy(name_buf,def); |
ff8b29b8 | 615 | |
06963d0f | 616 | if (getpeername(fd, (struct sockaddr *)&ss, &length)) { |
d5d4b282 MP |
617 | /* FIXME: Can we really not continue? */ |
618 | rprintf(FERROR, RSYNC_NAME ": getpeername on fd%d failed: %s\n", | |
c11b8806 | 619 | fd, strerror(errno)); |
65417579 | 620 | exit_cleanup(RERR_SOCKETIO); |
ff8b29b8 AT |
621 | } |
622 | ||
06963d0f | 623 | #ifdef INET6 |
d91c8c50 | 624 | if (get_sockaddr_family(&ss) == AF_INET6 && |
06963d0f | 625 | IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6 *)&ss)->sin6_addr)) { |
362099a5 MP |
626 | /* OK, so ss is in the IPv6 family, but it is really |
627 | * an IPv4 address: something like | |
628 | * "::ffff:10.130.1.2". If we use it as-is, then the | |
629 | * reverse lookup might fail or perhaps something else | |
630 | * bad might happen. So instead we convert it to an | |
631 | * equivalent address in the IPv4 address family. */ | |
06963d0f MP |
632 | struct sockaddr_in6 sin6; |
633 | struct sockaddr_in *sin; | |
634 | ||
635 | memcpy(&sin6, &ss, sizeof(sin6)); | |
636 | sin = (struct sockaddr_in *)&ss; | |
637 | memset(sin, 0, sizeof(*sin)); | |
638 | sin->sin_family = AF_INET; | |
639 | length = sizeof(struct sockaddr_in); | |
640 | #ifdef HAVE_SOCKADDR_LEN | |
641 | sin->sin_len = length; | |
642 | #endif | |
643 | sin->sin_port = sin6.sin6_port; | |
362099a5 MP |
644 | /* FIXME: Isn't there a macro we can use here rather |
645 | * than grovelling through the struct? It might be | |
646 | * wrong on some systems. */ | |
06963d0f MP |
647 | memcpy(&sin->sin_addr, &sin6.sin6_addr.s6_addr[12], |
648 | sizeof(sin->sin_addr)); | |
649 | } | |
650 | #endif | |
651 | ||
652 | /* reverse lookup */ | |
653 | if (getnameinfo((struct sockaddr *)&ss, length, | |
654 | name_buf, sizeof(name_buf), port_buf, sizeof(port_buf), | |
655 | NI_NAMEREQD | NI_NUMERICSERV) != 0) { | |
656 | strcpy(name_buf, def); | |
657 | rprintf(FERROR, "reverse name lookup failed\n"); | |
ff8b29b8 AT |
658 | } |
659 | ||
06963d0f MP |
660 | /* forward lookup */ |
661 | memset(&hints, 0, sizeof(hints)); | |
662 | hints.ai_family = PF_UNSPEC; | |
663 | hints.ai_flags = AI_CANONNAME; | |
664 | hints.ai_socktype = SOCK_STREAM; | |
665 | error = getaddrinfo(name_buf, port_buf, &hints, &res0); | |
666 | if (error) { | |
667 | strcpy(name_buf, def); | |
7ef6aa64 MP |
668 | rprintf(FERROR, |
669 | RSYNC_NAME ": forward name lookup for %s failed: %s\n", | |
670 | port_buf, | |
671 | gai_strerror(error)); | |
06963d0f MP |
672 | return name_buf; |
673 | } | |
de5fb374 | 674 | |
06963d0f MP |
675 | /* XXX sin6_flowinfo and other fields */ |
676 | for (res = res0; res; res = res->ai_next) { | |
d91c8c50 | 677 | if (res->ai_family != get_sockaddr_family(&ss)) |
06963d0f MP |
678 | continue; |
679 | if (res->ai_addrlen != length) | |
680 | continue; | |
681 | if (memcmp(res->ai_addr, &ss, res->ai_addrlen) == 0) | |
682 | break; | |
683 | } | |
684 | ||
06963d0f MP |
685 | if (res == NULL) { |
686 | strcpy(name_buf, def); | |
d5d4b282 | 687 | rprintf(FERROR, RSYNC_NAME ": " |
362099a5 MP |
688 | "reverse name lookup for \"%s\" failed on fd%d - spoofed address? \n", |
689 | name_buf, fd); | |
de5fb374 AT |
690 | } |
691 | ||
06963d0f | 692 | freeaddrinfo(res0); |
ff8b29b8 AT |
693 | return name_buf; |
694 | } | |
5c9730a4 | 695 | |
eecd22ff MP |
696 | |
697 | /******************************************************************* | |
698 | this is like socketpair but uses tcp. It is used by the Samba | |
699 | regression test code | |
700 | The function guarantees that nobody else can attach to the socket, | |
701 | or if they do that this function fails and the socket gets closed | |
702 | returns 0 on success, -1 on failure | |
703 | the resulting file descriptors are symmetrical | |
704 | ******************************************************************/ | |
705 | static int socketpair_tcp(int fd[2]) | |
706 | { | |
707 | int listener; | |
708 | struct sockaddr_in sock; | |
709 | struct sockaddr_in sock2; | |
710 | socklen_t socklen = sizeof(sock); | |
711 | int connect_done = 0; | |
712 | ||
713 | fd[0] = fd[1] = listener = -1; | |
714 | ||
715 | memset(&sock, 0, sizeof(sock)); | |
716 | ||
717 | if ((listener = socket(PF_INET, SOCK_STREAM, 0)) == -1) goto failed; | |
718 | ||
719 | memset(&sock2, 0, sizeof(sock2)); | |
720 | #ifdef HAVE_SOCK_SIN_LEN | |
721 | sock2.sin_len = sizeof(sock2); | |
722 | #endif | |
723 | sock2.sin_family = PF_INET; | |
724 | ||
725 | bind(listener, (struct sockaddr *)&sock2, sizeof(sock2)); | |
726 | ||
727 | if (listen(listener, 1) != 0) goto failed; | |
728 | ||
729 | if (getsockname(listener, (struct sockaddr *)&sock, &socklen) != 0) goto failed; | |
730 | ||
731 | if ((fd[1] = socket(PF_INET, SOCK_STREAM, 0)) == -1) goto failed; | |
732 | ||
733 | set_nonblocking(fd[1]); | |
734 | ||
735 | sock.sin_addr.s_addr = htonl(INADDR_LOOPBACK); | |
736 | ||
737 | if (connect(fd[1],(struct sockaddr *)&sock,sizeof(sock)) == -1) { | |
738 | if (errno != EINPROGRESS) goto failed; | |
739 | } else { | |
740 | connect_done = 1; | |
741 | } | |
742 | ||
743 | if ((fd[0] = accept(listener, (struct sockaddr *)&sock, &socklen)) == -1) goto failed; | |
744 | ||
745 | close(listener); | |
746 | if (connect_done == 0) { | |
747 | if (connect(fd[1],(struct sockaddr *)&sock,sizeof(sock)) != 0 | |
748 | && errno != EISCONN) goto failed; | |
749 | } | |
750 | ||
751 | set_blocking (fd[1]); | |
752 | ||
753 | /* all OK! */ | |
754 | return 0; | |
755 | ||
756 | failed: | |
757 | if (fd[0] != -1) close(fd[0]); | |
758 | if (fd[1] != -1) close(fd[1]); | |
759 | if (listener != -1) close(listener); | |
760 | return -1; | |
761 | } | |
762 | ||
763 | ||
764 | /******************************************************************* | |
765 | run a program on a local tcp socket, this is used to launch smbd | |
766 | when regression testing | |
767 | the return value is a socket which is attached to a subprocess | |
768 | running "prog". stdin and stdout are attached. stderr is left | |
769 | attached to the original stderr | |
770 | ******************************************************************/ | |
771 | int sock_exec(const char *prog) | |
772 | { | |
773 | int fd[2]; | |
774 | if (socketpair_tcp(fd) != 0) { | |
775 | rprintf (FERROR, RSYNC_NAME | |
776 | ": socketpair_tcp failed (%s)\n", | |
777 | strerror(errno)); | |
778 | return -1; | |
779 | } | |
780 | if (fork() == 0) { | |
781 | close(fd[0]); | |
782 | close(0); | |
783 | close(1); | |
784 | dup(fd[1]); | |
785 | dup(fd[1]); | |
786 | if (verbose > 3) | |
787 | fprintf (stderr, | |
788 | RSYNC_NAME ": execute socket program \"%s\"\n", | |
789 | prog); | |
790 | exit (system (prog)); | |
791 | } | |
792 | close (fd[1]); | |
793 | return fd[0]; | |
794 | } | |
795 | ||
796 | ||
797 |