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 | ||
660c6fbd MP |
36 | /* Establish a proxy connection on an open socket to a web roxy by |
37 | * using the CONNECT method. */ | |
4c3b4b25 AT |
38 | static int establish_proxy_connection(int fd, char *host, int port) |
39 | { | |
40 | char buffer[1024]; | |
41 | char *cp; | |
42 | ||
8950ac03 | 43 | snprintf(buffer, sizeof(buffer), "CONNECT %s:%d HTTP/1.0\r\n\r\n", host, port); |
4c3b4b25 | 44 | if (write(fd, buffer, strlen(buffer)) != strlen(buffer)) { |
660c6fbd | 45 | rprintf(FERROR, "failed to write to proxy: %s\n", |
4c3b4b25 AT |
46 | strerror(errno)); |
47 | return -1; | |
48 | } | |
49 | ||
50 | for (cp = buffer; cp < &buffer[sizeof(buffer) - 1]; cp++) { | |
51 | if (read(fd, cp, 1) != 1) { | |
660c6fbd MP |
52 | rprintf(FERROR, "failed to read from proxy: %s\n", |
53 | strerror(errno)); | |
4c3b4b25 AT |
54 | return -1; |
55 | } | |
56 | if (*cp == '\n') | |
57 | break; | |
58 | } | |
59 | ||
60 | if (*cp != '\n') | |
61 | cp++; | |
62 | *cp-- = '\0'; | |
63 | if (*cp == '\r') | |
64 | *cp = '\0'; | |
65 | if (strncmp(buffer, "HTTP/", 5) != 0) { | |
66 | rprintf(FERROR, "bad response from proxy - %s\n", | |
67 | buffer); | |
68 | return -1; | |
69 | } | |
70 | for (cp = &buffer[5]; isdigit(*cp) || (*cp == '.'); cp++) | |
71 | ; | |
72 | while (*cp == ' ') | |
73 | cp++; | |
74 | if (*cp != '2') { | |
75 | rprintf(FERROR, "bad response from proxy - %s\n", | |
76 | buffer); | |
77 | return -1; | |
78 | } | |
79 | /* throw away the rest of the HTTP header */ | |
80 | while (1) { | |
81 | for (cp = buffer; cp < &buffer[sizeof(buffer) - 1]; | |
82 | cp++) { | |
83 | if (read(fd, cp, 1) != 1) { | |
660c6fbd MP |
84 | rprintf(FERROR, "failed to read from proxy: %s\n", |
85 | strerror(errno)); | |
4c3b4b25 AT |
86 | return -1; |
87 | } | |
88 | if (*cp == '\n') | |
89 | break; | |
90 | } | |
91 | if ((cp > buffer) && (*cp == '\n')) | |
92 | cp--; | |
93 | if ((cp == buffer) && ((*cp == '\n') || (*cp == '\r'))) | |
94 | break; | |
95 | } | |
96 | return 0; | |
97 | } | |
98 | ||
99 | ||
f8be7d42 MP |
100 | /** |
101 | * Try to set the local address for a newly-created socket. Return -1 | |
102 | * if this fails. | |
103 | **/ | |
104 | int try_bind_local(int s, | |
105 | int ai_family, int ai_socktype, | |
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 MP |
123 | continue; |
124 | return s; | |
125 | } | |
126 | ||
127 | /* no error message; there might be some problem that allows | |
128 | * creation of the socket but not binding, perhaps if the | |
129 | * machine has no ipv6 address of this name. */ | |
130 | return -1; | |
131 | } | |
132 | ||
eecd22ff | 133 | |
d5d4b282 MP |
134 | /** |
135 | * Open a socket to a tcp remote host with the specified port . | |
06963d0f | 136 | * |
d5d4b282 MP |
137 | * Based on code from Warren. Proxy support by Stephen Rothwell. |
138 | * getaddrinfo() rewrite contributed by KAME.net. | |
06963d0f | 139 | * |
d5d4b282 MP |
140 | * Now that we support IPv6 we need to look up the remote machine's |
141 | * address first, using @p af_hint to set a preference for the type | |
142 | * of address. Then depending on whether it has v4 or v6 addresses we | |
143 | * try to open a connection. | |
06963d0f | 144 | * |
d5d4b282 MP |
145 | * The loop allows for machines with some addresses which may not be |
146 | * reachable, perhaps because we can't e.g. route ipv6 to that network | |
147 | * but we can get ip4 packets through. | |
148 | * | |
149 | * @param bind_address Local address to use. Normally NULL to bind | |
150 | * the wildcard address. | |
151 | * | |
152 | * @param af_hint Address family, e.g. AF_INET or AF_INET6. | |
06963d0f | 153 | **/ |
d5d4b282 MP |
154 | int open_socket_out(char *host, int port, const char *bind_address, |
155 | int af_hint) | |
bc2e93eb | 156 | { |
f0fca04e | 157 | int type = SOCK_STREAM; |
06963d0f MP |
158 | int error; |
159 | int s; | |
06963d0f MP |
160 | struct addrinfo hints, *res0, *res; |
161 | char portbuf[10]; | |
4c3b4b25 | 162 | char *h; |
4c3b4b25 AT |
163 | int proxied = 0; |
164 | char buffer[1024]; | |
165 | char *cp; | |
166 | ||
660c6fbd MP |
167 | /* if we have a RSYNC_PROXY env variable then redirect our |
168 | * connetcion via a web proxy at the given address. The format | |
169 | * is hostname:port */ | |
4c3b4b25 AT |
170 | h = getenv("RSYNC_PROXY"); |
171 | proxied = (h != NULL) && (*h != '\0'); | |
172 | ||
173 | if (proxied) { | |
174 | strlcpy(buffer, h, sizeof(buffer)); | |
175 | cp = strchr(buffer, ':'); | |
176 | if (cp == NULL) { | |
660c6fbd MP |
177 | rprintf(FERROR, |
178 | "invalid proxy specification: should be HOST:PORT\n"); | |
4c3b4b25 AT |
179 | return -1; |
180 | } | |
181 | *cp++ = '\0'; | |
06963d0f | 182 | strcpy(portbuf, cp); |
4c3b4b25 AT |
183 | h = buffer; |
184 | } else { | |
06963d0f | 185 | snprintf(portbuf, sizeof(portbuf), "%d", port); |
4c3b4b25 | 186 | h = host; |
4c3b4b25 | 187 | } |
f0fca04e | 188 | |
06963d0f | 189 | memset(&hints, 0, sizeof(hints)); |
d5d4b282 | 190 | hints.ai_family = af_hint; |
06963d0f MP |
191 | hints.ai_socktype = type; |
192 | error = getaddrinfo(h, portbuf, &hints, &res0); | |
193 | if (error) { | |
d5d4b282 MP |
194 | rprintf(FERROR, RSYNC_NAME ": getaddrinfo: %s %s: %s\n", |
195 | h, portbuf, gai_strerror(error)); | |
f0fca04e AT |
196 | return -1; |
197 | } | |
198 | ||
06963d0f | 199 | s = -1; |
2d6dbe29 MP |
200 | /* Try to connect to all addresses for this machine until we get |
201 | * through. It might e.g. be multi-homed, or have both IPv4 and IPv6 | |
202 | * addresses. We need to create a socket for each record, since the | |
203 | * address record tells us what protocol to use to try to connect. */ | |
06963d0f MP |
204 | for (res = res0; res; res = res->ai_next) { |
205 | s = socket(res->ai_family, res->ai_socktype, res->ai_protocol); | |
206 | if (s < 0) | |
207 | continue; | |
f0fca04e | 208 | |
f8be7d42 MP |
209 | if (bind_address) |
210 | if (try_bind_local(s, res->ai_family, type, | |
211 | bind_address) == -1) { | |
212 | close(s); | |
213 | s = -1; | |
06963d0f MP |
214 | continue; |
215 | } | |
e30f0657 | 216 | |
06963d0f MP |
217 | if (connect(s, res->ai_addr, res->ai_addrlen) < 0) { |
218 | close(s); | |
219 | s = -1; | |
220 | continue; | |
221 | } | |
222 | if (proxied && | |
223 | establish_proxy_connection(s, host, port) != 0) { | |
224 | close(s); | |
225 | s = -1; | |
226 | continue; | |
227 | } else | |
228 | break; | |
4c3b4b25 | 229 | } |
06963d0f MP |
230 | freeaddrinfo(res0); |
231 | if (s < 0) { | |
7ef6aa64 MP |
232 | rprintf(FERROR, RSYNC_NAME ": failed to connect to %s: %s\n", |
233 | h, strerror(errno)); | |
f0fca04e AT |
234 | return -1; |
235 | } | |
06963d0f | 236 | return s; |
f0fca04e AT |
237 | } |
238 | ||
239 | ||
eecd22ff MP |
240 | /** |
241 | * Open an outgoing socket, but allow for it to be intercepted by | |
242 | * $RSYNC_CONNECT_PROG, which will execute a program across a TCP | |
243 | * socketpair rather than really opening a socket. | |
244 | * | |
245 | * We use this primarily in testing to detect TCP flow bugs, but not | |
246 | * cause security problems by really opening remote connections. | |
247 | * | |
248 | * This is based on the Samba LIBSMB_PROG feature. | |
06963d0f MP |
249 | * |
250 | * @param bind_address Local address to use. Normally NULL to get the stack default. | |
eecd22ff MP |
251 | **/ |
252 | int open_socket_out_wrapped (char *host, | |
253 | int port, | |
d5d4b282 MP |
254 | const char *bind_address, |
255 | int af_hint) | |
eecd22ff MP |
256 | { |
257 | char *prog; | |
258 | ||
259 | if ((prog = getenv ("RSYNC_CONNECT_PROG")) != NULL) | |
260 | return sock_exec (prog); | |
261 | else | |
d5d4b282 MP |
262 | return open_socket_out (host, port, bind_address, |
263 | af_hint); | |
eecd22ff MP |
264 | } |
265 | ||
266 | ||
267 | ||
06963d0f MP |
268 | /** |
269 | * Open a socket of the specified type, port and address for incoming data | |
270 | * | |
b8771f96 MP |
271 | * Try to be better about handling the results of getaddrinfo(): when |
272 | * opening an inbound socket, we might get several address results, | |
273 | * e.g. for the machine's ipv4 and ipv6 name. | |
274 | * | |
275 | * If binding a wildcard, then any one of them should do. If an address | |
276 | * was specified but it's insufficiently specific then that's not our | |
277 | * fault. | |
278 | * | |
279 | * However, some of the advertized addresses may not work because e.g. we | |
280 | * don't have IPv6 support in the kernel. In that case go on and try all | |
281 | * addresses until one succeeds. | |
282 | * | |
06963d0f MP |
283 | * @param bind_address Local address to bind, or NULL to allow it to |
284 | * default. | |
285 | **/ | |
d5d4b282 MP |
286 | static int open_socket_in(int type, int port, const char *bind_address, |
287 | int af_hint) | |
f0fca04e | 288 | { |
f0fca04e | 289 | int one=1; |
06963d0f | 290 | int s; |
13e29995 | 291 | struct addrinfo hints, *all_ai, *resp; |
06963d0f MP |
292 | char portbuf[10]; |
293 | int error; | |
294 | ||
295 | memset(&hints, 0, sizeof(hints)); | |
d5d4b282 | 296 | hints.ai_family = af_hint; |
06963d0f MP |
297 | hints.ai_socktype = type; |
298 | hints.ai_flags = AI_PASSIVE; | |
299 | snprintf(portbuf, sizeof(portbuf), "%d", port); | |
13e29995 | 300 | error = getaddrinfo(bind_address, portbuf, &hints, &all_ai); |
06963d0f | 301 | if (error) { |
7ef6aa64 MP |
302 | rprintf(FERROR, RSYNC_NAME ": getaddrinfo: bind address %s: %s\n", |
303 | bind_address, gai_strerror(error)); | |
06963d0f MP |
304 | return -1; |
305 | } | |
06963d0f | 306 | |
13e29995 MP |
307 | /* We may not be able to create the socket, if for example the |
308 | * machine knows about IPv6 in the C library, but not in the | |
309 | * kernel. */ | |
310 | for (resp = all_ai; resp; resp = resp->ai_next) { | |
311 | s = socket(resp->ai_family, resp->ai_socktype, | |
312 | resp->ai_protocol); | |
313 | ||
314 | if (s == -1) | |
315 | /* See if there's another address that will work... */ | |
316 | continue; | |
317 | ||
318 | setsockopt(s, SOL_SOCKET, SO_REUSEADDR, | |
319 | (char *)&one, sizeof one); | |
320 | ||
321 | /* now we've got a socket - we need to bind it */ | |
322 | if (bind(s, all_ai->ai_addr, all_ai->ai_addrlen) < 0) { | |
323 | /* Nope, try another */ | |
324 | close(s); | |
325 | continue; | |
b8771f96 MP |
326 | } |
327 | ||
13e29995 | 328 | return s; |
f0fca04e AT |
329 | } |
330 | ||
13e29995 MP |
331 | rprintf(FERROR, RSYNC_NAME ": open inbound socket on port %d failed: " |
332 | "%s\n", | |
333 | port, | |
334 | strerror(errno)); | |
b8771f96 | 335 | |
13e29995 | 336 | freeaddrinfo(all_ai); |
b8771f96 | 337 | return -1; |
f0fca04e AT |
338 | } |
339 | ||
340 | ||
7c1b4daa MP |
341 | /* |
342 | * Determine if a file descriptor is in fact a socket | |
343 | */ | |
f0fca04e AT |
344 | int is_a_socket(int fd) |
345 | { | |
ac2a1a44 MP |
346 | int v; |
347 | socklen_t l; | |
3eb38818 | 348 | l = sizeof(int); |
7c1b4daa MP |
349 | |
350 | /* Parameters to getsockopt, setsockopt etc are very | |
351 | * unstandardized across platforms, so don't be surprised if | |
ac2a1a44 MP |
352 | * there are compiler warnings on e.g. SCO OpenSwerver or AIX. |
353 | * It seems they all eventually get the right idea. | |
7c1b4daa MP |
354 | * |
355 | * Debian says: ``The fifth argument of getsockopt and | |
356 | * setsockopt is in reality an int [*] (and this is what BSD | |
357 | * 4.* and libc4 and libc5 have). Some POSIX confusion | |
358 | * resulted in the present socklen_t. The draft standard has | |
359 | * not been adopted yet, but glibc2 already follows it and | |
360 | * also has socklen_t [*]. See also accept(2).'' | |
361 | * | |
362 | * We now return to your regularly scheduled programming. */ | |
3eb38818 | 363 | return(getsockopt(fd, SOL_SOCKET, SO_TYPE, (char *)&v, &l) == 0); |
f0fca04e AT |
364 | } |
365 | ||
366 | ||
8ef4ffd6 | 367 | void start_accept_loop(int port, int (*fn)(int )) |
f0fca04e AT |
368 | { |
369 | int s; | |
06963d0f | 370 | extern char *bind_address; |
13e29995 | 371 | extern int default_af_hint; |
f0fca04e | 372 | |
f0fca04e | 373 | /* open an incoming socket */ |
13e29995 | 374 | s = open_socket_in(SOCK_STREAM, port, bind_address, default_af_hint); |
f0fca04e | 375 | if (s == -1) |
65417579 | 376 | exit_cleanup(RERR_SOCKETIO); |
f0fca04e AT |
377 | |
378 | /* ready to listen */ | |
379 | if (listen(s, 5) == -1) { | |
380 | close(s); | |
65417579 | 381 | exit_cleanup(RERR_SOCKETIO); |
f0fca04e AT |
382 | } |
383 | ||
384 | ||
385 | /* now accept incoming connections - forking a new process | |
386 | for each incoming connection */ | |
387 | while (1) { | |
388 | fd_set fds; | |
389 | int fd; | |
2d6dbe29 | 390 | struct sockaddr_storage addr; |
d54765c4 | 391 | socklen_t addrlen = sizeof addr; |
f0fca04e | 392 | |
15b84e14 DD |
393 | /* close log file before the potentially very long select so |
394 | file can be trimmed by another process instead of growing | |
395 | forever */ | |
396 | log_close(); | |
45a83540 | 397 | |
f0fca04e AT |
398 | FD_ZERO(&fds); |
399 | FD_SET(s, &fds); | |
400 | ||
401 | if (select(s+1, &fds, NULL, NULL, NULL) != 1) { | |
402 | continue; | |
403 | } | |
404 | ||
405 | if(!FD_ISSET(s, &fds)) continue; | |
406 | ||
2d6dbe29 | 407 | fd = accept(s,(struct sockaddr *)&addr,&addrlen); |
f0fca04e AT |
408 | |
409 | if (fd == -1) continue; | |
410 | ||
31f440e6 AT |
411 | signal(SIGCHLD, SIG_IGN); |
412 | ||
413 | /* we shouldn't have any children left hanging around | |
414 | but I have had reports that on Digital Unix zombies | |
415 | are produced, so this ensures that they are reaped */ | |
416 | #ifdef WNOHANG | |
0503f060 | 417 | while (waitpid(-1, NULL, WNOHANG) > 0); |
31f440e6 AT |
418 | #endif |
419 | ||
f0fca04e AT |
420 | if (fork()==0) { |
421 | close(s); | |
15b84e14 DD |
422 | /* open log file in child before possibly giving |
423 | up privileges */ | |
424 | log_open(); | |
f0fca04e AT |
425 | _exit(fn(fd)); |
426 | } | |
427 | ||
428 | close(fd); | |
429 | } | |
f0fca04e AT |
430 | } |
431 | ||
432 | ||
433 | enum SOCK_OPT_TYPES {OPT_BOOL,OPT_INT,OPT_ON}; | |
434 | ||
435 | struct | |
436 | { | |
437 | char *name; | |
438 | int level; | |
439 | int option; | |
440 | int value; | |
441 | int opttype; | |
442 | } socket_options[] = { | |
443 | {"SO_KEEPALIVE", SOL_SOCKET, SO_KEEPALIVE, 0, OPT_BOOL}, | |
444 | {"SO_REUSEADDR", SOL_SOCKET, SO_REUSEADDR, 0, OPT_BOOL}, | |
445 | {"SO_BROADCAST", SOL_SOCKET, SO_BROADCAST, 0, OPT_BOOL}, | |
446 | #ifdef TCP_NODELAY | |
447 | {"TCP_NODELAY", IPPROTO_TCP, TCP_NODELAY, 0, OPT_BOOL}, | |
448 | #endif | |
449 | #ifdef IPTOS_LOWDELAY | |
450 | {"IPTOS_LOWDELAY", IPPROTO_IP, IP_TOS, IPTOS_LOWDELAY, OPT_ON}, | |
451 | #endif | |
452 | #ifdef IPTOS_THROUGHPUT | |
453 | {"IPTOS_THROUGHPUT", IPPROTO_IP, IP_TOS, IPTOS_THROUGHPUT, OPT_ON}, | |
454 | #endif | |
455 | #ifdef SO_SNDBUF | |
456 | {"SO_SNDBUF", SOL_SOCKET, SO_SNDBUF, 0, OPT_INT}, | |
457 | #endif | |
458 | #ifdef SO_RCVBUF | |
459 | {"SO_RCVBUF", SOL_SOCKET, SO_RCVBUF, 0, OPT_INT}, | |
460 | #endif | |
461 | #ifdef SO_SNDLOWAT | |
462 | {"SO_SNDLOWAT", SOL_SOCKET, SO_SNDLOWAT, 0, OPT_INT}, | |
463 | #endif | |
464 | #ifdef SO_RCVLOWAT | |
465 | {"SO_RCVLOWAT", SOL_SOCKET, SO_RCVLOWAT, 0, OPT_INT}, | |
466 | #endif | |
467 | #ifdef SO_SNDTIMEO | |
468 | {"SO_SNDTIMEO", SOL_SOCKET, SO_SNDTIMEO, 0, OPT_INT}, | |
469 | #endif | |
470 | #ifdef SO_RCVTIMEO | |
471 | {"SO_RCVTIMEO", SOL_SOCKET, SO_RCVTIMEO, 0, OPT_INT}, | |
472 | #endif | |
473 | {NULL,0,0,0,0}}; | |
474 | ||
475 | ||
476 | ||
477 | /**************************************************************************** | |
478 | set user socket options | |
479 | ****************************************************************************/ | |
480 | void set_socket_options(int fd, char *options) | |
481 | { | |
482 | char *tok; | |
a6801c39 AT |
483 | if (!options || !*options) return; |
484 | ||
f0fca04e AT |
485 | options = strdup(options); |
486 | ||
487 | if (!options) out_of_memory("set_socket_options"); | |
488 | ||
489 | for (tok=strtok(options, " \t,"); tok; tok=strtok(NULL," \t,")) { | |
490 | int ret=0,i; | |
491 | int value = 1; | |
492 | char *p; | |
493 | int got_value = 0; | |
494 | ||
495 | if ((p = strchr(tok,'='))) { | |
496 | *p = 0; | |
497 | value = atoi(p+1); | |
498 | got_value = 1; | |
499 | } | |
500 | ||
501 | for (i=0;socket_options[i].name;i++) | |
502 | if (strcmp(socket_options[i].name,tok)==0) | |
503 | break; | |
504 | ||
505 | if (!socket_options[i].name) { | |
506 | rprintf(FERROR,"Unknown socket option %s\n",tok); | |
507 | continue; | |
508 | } | |
509 | ||
510 | switch (socket_options[i].opttype) { | |
511 | case OPT_BOOL: | |
512 | case OPT_INT: | |
513 | ret = setsockopt(fd,socket_options[i].level, | |
514 | socket_options[i].option,(char *)&value,sizeof(int)); | |
515 | break; | |
516 | ||
517 | case OPT_ON: | |
518 | if (got_value) | |
519 | rprintf(FERROR,"syntax error - %s does not take a value\n",tok); | |
520 | ||
521 | { | |
522 | int on = socket_options[i].value; | |
523 | ret = setsockopt(fd,socket_options[i].level, | |
524 | socket_options[i].option,(char *)&on,sizeof(int)); | |
525 | } | |
526 | break; | |
527 | } | |
528 | ||
529 | if (ret != 0) | |
660c6fbd MP |
530 | rprintf(FERROR, "failed to set socket option %s: %s\n", tok, |
531 | strerror(errno)); | |
f0fca04e AT |
532 | } |
533 | ||
534 | free(options); | |
535 | } | |
536 | ||
537 | /**************************************************************************** | |
538 | become a daemon, discarding the controlling terminal | |
539 | ****************************************************************************/ | |
540 | void become_daemon(void) | |
541 | { | |
b11ed3b1 AT |
542 | int i; |
543 | ||
c46ded46 | 544 | if (fork()) { |
f0fca04e | 545 | _exit(0); |
c46ded46 | 546 | } |
f0fca04e AT |
547 | |
548 | /* detach from the terminal */ | |
549 | #ifdef HAVE_SETSID | |
550 | setsid(); | |
551 | #else | |
552 | #ifdef TIOCNOTTY | |
c46ded46 AT |
553 | i = open("/dev/tty", O_RDWR); |
554 | if (i >= 0) { | |
555 | ioctl(i, (int) TIOCNOTTY, (char *)0); | |
556 | close(i); | |
f0fca04e AT |
557 | } |
558 | #endif /* TIOCNOTTY */ | |
559 | #endif | |
b11ed3b1 AT |
560 | /* make sure that stdin, stdout an stderr don't stuff things |
561 | up (library functions, for example) */ | |
562 | for (i=0;i<3;i++) { | |
563 | close(i); | |
564 | open("/dev/null", O_RDWR); | |
565 | } | |
bc2e93eb | 566 | } |
ff8b29b8 | 567 | |
1f0fa931 MP |
568 | /** |
569 | * Return the IP addr of the client as a string | |
570 | **/ | |
ff8b29b8 AT |
571 | char *client_addr(int fd) |
572 | { | |
2d6dbe29 | 573 | struct sockaddr_storage ss; |
d54765c4 | 574 | socklen_t length = sizeof ss; |
ff8b29b8 | 575 | static char addr_buf[100]; |
11a5a3c7 AT |
576 | static int initialised; |
577 | ||
578 | if (initialised) return addr_buf; | |
579 | ||
580 | initialised = 1; | |
ff8b29b8 | 581 | |
2d6dbe29 | 582 | if (getpeername(fd, (struct sockaddr *)&ss, &length)) { |
65417579 | 583 | exit_cleanup(RERR_SOCKETIO); |
ff8b29b8 | 584 | } |
06963d0f | 585 | |
2d6dbe29 | 586 | getnameinfo((struct sockaddr *)&ss, length, |
06963d0f | 587 | addr_buf, sizeof(addr_buf), NULL, 0, NI_NUMERICHOST); |
ff8b29b8 AT |
588 | return addr_buf; |
589 | } | |
590 | ||
591 | ||
51f289d1 | 592 | static int get_sockaddr_family(const struct sockaddr_storage *ss) |
d91c8c50 MP |
593 | { |
594 | return ((struct sockaddr *) ss)->sa_family; | |
595 | } | |
596 | ||
597 | ||
1f0fa931 | 598 | /** |
d1d15050 MP |
599 | * Return the DNS name of the client. |
600 | * | |
601 | * The name is statically cached so that repeated lookups are quick, | |
602 | * so there is a limit of one lookup per customer. | |
1f0fa931 | 603 | **/ |
ff8b29b8 AT |
604 | char *client_name(int fd) |
605 | { | |
2d6dbe29 | 606 | struct sockaddr_storage ss; |
d54765c4 | 607 | socklen_t length = sizeof ss; |
ff8b29b8 | 608 | static char name_buf[100]; |
06963d0f | 609 | static char port_buf[100]; |
de5fb374 | 610 | char *def = "UNKNOWN"; |
11a5a3c7 | 611 | static int initialised; |
06963d0f MP |
612 | struct addrinfo hints, *res, *res0; |
613 | int error; | |
11a5a3c7 AT |
614 | |
615 | if (initialised) return name_buf; | |
616 | ||
617 | initialised = 1; | |
ff8b29b8 | 618 | |
de5fb374 | 619 | strcpy(name_buf,def); |
ff8b29b8 | 620 | |
06963d0f | 621 | if (getpeername(fd, (struct sockaddr *)&ss, &length)) { |
d5d4b282 MP |
622 | /* FIXME: Can we really not continue? */ |
623 | rprintf(FERROR, RSYNC_NAME ": getpeername on fd%d failed: %s\n", | |
c11b8806 | 624 | fd, strerror(errno)); |
65417579 | 625 | exit_cleanup(RERR_SOCKETIO); |
ff8b29b8 AT |
626 | } |
627 | ||
06963d0f | 628 | #ifdef INET6 |
d91c8c50 | 629 | if (get_sockaddr_family(&ss) == AF_INET6 && |
06963d0f | 630 | IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6 *)&ss)->sin6_addr)) { |
362099a5 MP |
631 | /* OK, so ss is in the IPv6 family, but it is really |
632 | * an IPv4 address: something like | |
633 | * "::ffff:10.130.1.2". If we use it as-is, then the | |
634 | * reverse lookup might fail or perhaps something else | |
635 | * bad might happen. So instead we convert it to an | |
636 | * equivalent address in the IPv4 address family. */ | |
06963d0f MP |
637 | struct sockaddr_in6 sin6; |
638 | struct sockaddr_in *sin; | |
639 | ||
640 | memcpy(&sin6, &ss, sizeof(sin6)); | |
641 | sin = (struct sockaddr_in *)&ss; | |
642 | memset(sin, 0, sizeof(*sin)); | |
643 | sin->sin_family = AF_INET; | |
644 | length = sizeof(struct sockaddr_in); | |
645 | #ifdef HAVE_SOCKADDR_LEN | |
646 | sin->sin_len = length; | |
647 | #endif | |
648 | sin->sin_port = sin6.sin6_port; | |
362099a5 MP |
649 | /* FIXME: Isn't there a macro we can use here rather |
650 | * than grovelling through the struct? It might be | |
651 | * wrong on some systems. */ | |
06963d0f MP |
652 | memcpy(&sin->sin_addr, &sin6.sin6_addr.s6_addr[12], |
653 | sizeof(sin->sin_addr)); | |
654 | } | |
655 | #endif | |
656 | ||
657 | /* reverse lookup */ | |
658 | if (getnameinfo((struct sockaddr *)&ss, length, | |
659 | name_buf, sizeof(name_buf), port_buf, sizeof(port_buf), | |
660 | NI_NAMEREQD | NI_NUMERICSERV) != 0) { | |
661 | strcpy(name_buf, def); | |
662 | rprintf(FERROR, "reverse name lookup failed\n"); | |
ff8b29b8 AT |
663 | } |
664 | ||
06963d0f MP |
665 | /* forward lookup */ |
666 | memset(&hints, 0, sizeof(hints)); | |
667 | hints.ai_family = PF_UNSPEC; | |
668 | hints.ai_flags = AI_CANONNAME; | |
669 | hints.ai_socktype = SOCK_STREAM; | |
670 | error = getaddrinfo(name_buf, port_buf, &hints, &res0); | |
671 | if (error) { | |
672 | strcpy(name_buf, def); | |
7ef6aa64 MP |
673 | rprintf(FERROR, |
674 | RSYNC_NAME ": forward name lookup for %s failed: %s\n", | |
675 | port_buf, | |
676 | gai_strerror(error)); | |
06963d0f MP |
677 | return name_buf; |
678 | } | |
de5fb374 | 679 | |
06963d0f MP |
680 | /* XXX sin6_flowinfo and other fields */ |
681 | for (res = res0; res; res = res->ai_next) { | |
d91c8c50 | 682 | if (res->ai_family != get_sockaddr_family(&ss)) |
06963d0f MP |
683 | continue; |
684 | if (res->ai_addrlen != length) | |
685 | continue; | |
686 | if (memcmp(res->ai_addr, &ss, res->ai_addrlen) == 0) | |
687 | break; | |
688 | } | |
689 | ||
06963d0f MP |
690 | if (res == NULL) { |
691 | strcpy(name_buf, def); | |
d5d4b282 | 692 | rprintf(FERROR, RSYNC_NAME ": " |
362099a5 MP |
693 | "reverse name lookup for \"%s\" failed on fd%d - spoofed address? \n", |
694 | name_buf, fd); | |
de5fb374 AT |
695 | } |
696 | ||
06963d0f | 697 | freeaddrinfo(res0); |
ff8b29b8 AT |
698 | return name_buf; |
699 | } | |
5c9730a4 | 700 | |
eecd22ff MP |
701 | |
702 | /******************************************************************* | |
703 | this is like socketpair but uses tcp. It is used by the Samba | |
704 | regression test code | |
705 | The function guarantees that nobody else can attach to the socket, | |
706 | or if they do that this function fails and the socket gets closed | |
707 | returns 0 on success, -1 on failure | |
708 | the resulting file descriptors are symmetrical | |
709 | ******************************************************************/ | |
710 | static int socketpair_tcp(int fd[2]) | |
711 | { | |
712 | int listener; | |
713 | struct sockaddr_in sock; | |
714 | struct sockaddr_in sock2; | |
715 | socklen_t socklen = sizeof(sock); | |
716 | int connect_done = 0; | |
717 | ||
718 | fd[0] = fd[1] = listener = -1; | |
719 | ||
720 | memset(&sock, 0, sizeof(sock)); | |
721 | ||
722 | if ((listener = socket(PF_INET, SOCK_STREAM, 0)) == -1) goto failed; | |
723 | ||
724 | memset(&sock2, 0, sizeof(sock2)); | |
725 | #ifdef HAVE_SOCK_SIN_LEN | |
726 | sock2.sin_len = sizeof(sock2); | |
727 | #endif | |
728 | sock2.sin_family = PF_INET; | |
729 | ||
730 | bind(listener, (struct sockaddr *)&sock2, sizeof(sock2)); | |
731 | ||
732 | if (listen(listener, 1) != 0) goto failed; | |
733 | ||
734 | if (getsockname(listener, (struct sockaddr *)&sock, &socklen) != 0) goto failed; | |
735 | ||
736 | if ((fd[1] = socket(PF_INET, SOCK_STREAM, 0)) == -1) goto failed; | |
737 | ||
738 | set_nonblocking(fd[1]); | |
739 | ||
740 | sock.sin_addr.s_addr = htonl(INADDR_LOOPBACK); | |
741 | ||
742 | if (connect(fd[1],(struct sockaddr *)&sock,sizeof(sock)) == -1) { | |
743 | if (errno != EINPROGRESS) goto failed; | |
744 | } else { | |
745 | connect_done = 1; | |
746 | } | |
747 | ||
748 | if ((fd[0] = accept(listener, (struct sockaddr *)&sock, &socklen)) == -1) goto failed; | |
749 | ||
750 | close(listener); | |
751 | if (connect_done == 0) { | |
752 | if (connect(fd[1],(struct sockaddr *)&sock,sizeof(sock)) != 0 | |
753 | && errno != EISCONN) goto failed; | |
754 | } | |
755 | ||
756 | set_blocking (fd[1]); | |
757 | ||
758 | /* all OK! */ | |
759 | return 0; | |
760 | ||
761 | failed: | |
762 | if (fd[0] != -1) close(fd[0]); | |
763 | if (fd[1] != -1) close(fd[1]); | |
764 | if (listener != -1) close(listener); | |
765 | return -1; | |
766 | } | |
767 | ||
768 | ||
769 | /******************************************************************* | |
770 | run a program on a local tcp socket, this is used to launch smbd | |
771 | when regression testing | |
772 | the return value is a socket which is attached to a subprocess | |
773 | running "prog". stdin and stdout are attached. stderr is left | |
774 | attached to the original stderr | |
775 | ******************************************************************/ | |
776 | int sock_exec(const char *prog) | |
777 | { | |
778 | int fd[2]; | |
779 | if (socketpair_tcp(fd) != 0) { | |
780 | rprintf (FERROR, RSYNC_NAME | |
781 | ": socketpair_tcp failed (%s)\n", | |
782 | strerror(errno)); | |
783 | return -1; | |
784 | } | |
785 | if (fork() == 0) { | |
786 | close(fd[0]); | |
787 | close(0); | |
788 | close(1); | |
789 | dup(fd[1]); | |
790 | dup(fd[1]); | |
791 | if (verbose > 3) | |
792 | fprintf (stderr, | |
793 | RSYNC_NAME ": execute socket program \"%s\"\n", | |
794 | prog); | |
795 | exit (system (prog)); | |
796 | } | |
797 | close (fd[1]); | |
798 | return fd[0]; | |
799 | } | |
800 | ||
801 | ||
802 |