Commit | Line | Data |
---|---|---|
7c1b4daa MP |
1 | /* -*- c-file-style: "linux" -*- |
2 | ||
eecd22ff | 3 | Copyright (C) 1992-2001 by Andrew Tridgell <tridge@samba.org> |
7d91d5a6 | 4 | Copyright (C) 2001 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. | |
25 | **/ | |
bc2e93eb | 26 | |
f0fca04e AT |
27 | #include "rsync.h" |
28 | ||
06963d0f MP |
29 | #ifndef HAVE_GETADDRINFO |
30 | #include "lib/addrinfo.h" | |
31 | #endif | |
32 | ||
660c6fbd MP |
33 | /* Establish a proxy connection on an open socket to a web roxy by |
34 | * using the CONNECT method. */ | |
4c3b4b25 AT |
35 | static int establish_proxy_connection(int fd, char *host, int port) |
36 | { | |
37 | char buffer[1024]; | |
38 | char *cp; | |
39 | ||
8950ac03 | 40 | snprintf(buffer, sizeof(buffer), "CONNECT %s:%d HTTP/1.0\r\n\r\n", host, port); |
4c3b4b25 | 41 | if (write(fd, buffer, strlen(buffer)) != strlen(buffer)) { |
660c6fbd | 42 | rprintf(FERROR, "failed to write to proxy: %s\n", |
4c3b4b25 AT |
43 | strerror(errno)); |
44 | return -1; | |
45 | } | |
46 | ||
47 | for (cp = buffer; cp < &buffer[sizeof(buffer) - 1]; cp++) { | |
48 | if (read(fd, cp, 1) != 1) { | |
660c6fbd MP |
49 | rprintf(FERROR, "failed to read from proxy: %s\n", |
50 | strerror(errno)); | |
4c3b4b25 AT |
51 | return -1; |
52 | } | |
53 | if (*cp == '\n') | |
54 | break; | |
55 | } | |
56 | ||
57 | if (*cp != '\n') | |
58 | cp++; | |
59 | *cp-- = '\0'; | |
60 | if (*cp == '\r') | |
61 | *cp = '\0'; | |
62 | if (strncmp(buffer, "HTTP/", 5) != 0) { | |
63 | rprintf(FERROR, "bad response from proxy - %s\n", | |
64 | buffer); | |
65 | return -1; | |
66 | } | |
67 | for (cp = &buffer[5]; isdigit(*cp) || (*cp == '.'); cp++) | |
68 | ; | |
69 | while (*cp == ' ') | |
70 | cp++; | |
71 | if (*cp != '2') { | |
72 | rprintf(FERROR, "bad response from proxy - %s\n", | |
73 | buffer); | |
74 | return -1; | |
75 | } | |
76 | /* throw away the rest of the HTTP header */ | |
77 | while (1) { | |
78 | for (cp = buffer; cp < &buffer[sizeof(buffer) - 1]; | |
79 | cp++) { | |
80 | if (read(fd, cp, 1) != 1) { | |
660c6fbd MP |
81 | rprintf(FERROR, "failed to read from proxy: %s\n", |
82 | strerror(errno)); | |
4c3b4b25 AT |
83 | return -1; |
84 | } | |
85 | if (*cp == '\n') | |
86 | break; | |
87 | } | |
88 | if ((cp > buffer) && (*cp == '\n')) | |
89 | cp--; | |
90 | if ((cp == buffer) && ((*cp == '\n') || (*cp == '\r'))) | |
91 | break; | |
92 | } | |
93 | return 0; | |
94 | } | |
95 | ||
96 | ||
eecd22ff | 97 | |
d5d4b282 MP |
98 | /** |
99 | * Open a socket to a tcp remote host with the specified port . | |
06963d0f | 100 | * |
d5d4b282 MP |
101 | * Based on code from Warren. Proxy support by Stephen Rothwell. |
102 | * getaddrinfo() rewrite contributed by KAME.net. | |
06963d0f | 103 | * |
d5d4b282 MP |
104 | * Now that we support IPv6 we need to look up the remote machine's |
105 | * address first, using @p af_hint to set a preference for the type | |
106 | * of address. Then depending on whether it has v4 or v6 addresses we | |
107 | * try to open a connection. | |
06963d0f | 108 | * |
d5d4b282 MP |
109 | * The loop allows for machines with some addresses which may not be |
110 | * reachable, perhaps because we can't e.g. route ipv6 to that network | |
111 | * but we can get ip4 packets through. | |
112 | * | |
113 | * @param bind_address Local address to use. Normally NULL to bind | |
114 | * the wildcard address. | |
115 | * | |
116 | * @param af_hint Address family, e.g. AF_INET or AF_INET6. | |
06963d0f | 117 | **/ |
d5d4b282 MP |
118 | int open_socket_out(char *host, int port, const char *bind_address, |
119 | int af_hint) | |
bc2e93eb | 120 | { |
f0fca04e | 121 | int type = SOCK_STREAM; |
06963d0f MP |
122 | int error; |
123 | int s; | |
124 | int result; | |
125 | struct addrinfo hints, *res0, *res; | |
126 | char portbuf[10]; | |
4c3b4b25 | 127 | char *h; |
4c3b4b25 AT |
128 | int proxied = 0; |
129 | char buffer[1024]; | |
130 | char *cp; | |
131 | ||
660c6fbd MP |
132 | /* if we have a RSYNC_PROXY env variable then redirect our |
133 | * connetcion via a web proxy at the given address. The format | |
134 | * is hostname:port */ | |
4c3b4b25 AT |
135 | h = getenv("RSYNC_PROXY"); |
136 | proxied = (h != NULL) && (*h != '\0'); | |
137 | ||
138 | if (proxied) { | |
139 | strlcpy(buffer, h, sizeof(buffer)); | |
140 | cp = strchr(buffer, ':'); | |
141 | if (cp == NULL) { | |
660c6fbd MP |
142 | rprintf(FERROR, |
143 | "invalid proxy specification: should be HOST:PORT\n"); | |
4c3b4b25 AT |
144 | return -1; |
145 | } | |
146 | *cp++ = '\0'; | |
06963d0f | 147 | strcpy(portbuf, cp); |
4c3b4b25 AT |
148 | h = buffer; |
149 | } else { | |
06963d0f | 150 | snprintf(portbuf, sizeof(portbuf), "%d", port); |
4c3b4b25 | 151 | h = host; |
4c3b4b25 | 152 | } |
f0fca04e | 153 | |
06963d0f | 154 | memset(&hints, 0, sizeof(hints)); |
d5d4b282 | 155 | hints.ai_family = af_hint; |
06963d0f MP |
156 | hints.ai_socktype = type; |
157 | error = getaddrinfo(h, portbuf, &hints, &res0); | |
158 | if (error) { | |
d5d4b282 MP |
159 | rprintf(FERROR, RSYNC_NAME ": getaddrinfo: %s %s: %s\n", |
160 | h, portbuf, gai_strerror(error)); | |
f0fca04e AT |
161 | return -1; |
162 | } | |
163 | ||
06963d0f | 164 | s = -1; |
2d6dbe29 MP |
165 | /* Try to connect to all addresses for this machine until we get |
166 | * through. It might e.g. be multi-homed, or have both IPv4 and IPv6 | |
167 | * addresses. We need to create a socket for each record, since the | |
168 | * address record tells us what protocol to use to try to connect. */ | |
06963d0f MP |
169 | for (res = res0; res; res = res->ai_next) { |
170 | s = socket(res->ai_family, res->ai_socktype, res->ai_protocol); | |
171 | if (s < 0) | |
172 | continue; | |
f0fca04e | 173 | |
06963d0f MP |
174 | if (bind_address) { |
175 | struct addrinfo bhints, *bres; | |
176 | ||
177 | memset(&bhints, 0, sizeof(bhints)); | |
178 | bhints.ai_family = res->ai_family; | |
179 | bhints.ai_socktype = type; | |
180 | bhints.ai_flags = AI_PASSIVE; | |
181 | error = getaddrinfo(bind_address, NULL, &bhints, &bres); | |
182 | if (error) { | |
2d6dbe29 MP |
183 | rprintf(FERROR, RSYNC_NAME ": getaddrinfo: " |
184 | "bind address %s <noport>: %s\n", | |
7ef6aa64 | 185 | bind_address, gai_strerror(error)); |
06963d0f MP |
186 | continue; |
187 | } | |
188 | if (bres->ai_next) { | |
2d6dbe29 MP |
189 | /* I'm not at all sure that this is the right |
190 | * response here... -- mbp */ | |
191 | rprintf(FERROR, RSYNC_NAME ": getaddrinfo: " | |
192 | "bind address %s resolved to multiple hosts\n", | |
7ef6aa64 | 193 | bind_address); |
06963d0f MP |
194 | freeaddrinfo(bres); |
195 | continue; | |
196 | } | |
197 | bind(s, bres->ai_addr, bres->ai_addrlen); | |
198 | } | |
e30f0657 | 199 | |
06963d0f MP |
200 | if (connect(s, res->ai_addr, res->ai_addrlen) < 0) { |
201 | close(s); | |
202 | s = -1; | |
203 | continue; | |
204 | } | |
205 | if (proxied && | |
206 | establish_proxy_connection(s, host, port) != 0) { | |
207 | close(s); | |
208 | s = -1; | |
209 | continue; | |
210 | } else | |
211 | break; | |
4c3b4b25 | 212 | } |
06963d0f MP |
213 | freeaddrinfo(res0); |
214 | if (s < 0) { | |
7ef6aa64 MP |
215 | rprintf(FERROR, RSYNC_NAME ": failed to connect to %s: %s\n", |
216 | h, strerror(errno)); | |
f0fca04e AT |
217 | return -1; |
218 | } | |
06963d0f | 219 | return s; |
f0fca04e AT |
220 | } |
221 | ||
222 | ||
eecd22ff MP |
223 | /** |
224 | * Open an outgoing socket, but allow for it to be intercepted by | |
225 | * $RSYNC_CONNECT_PROG, which will execute a program across a TCP | |
226 | * socketpair rather than really opening a socket. | |
227 | * | |
228 | * We use this primarily in testing to detect TCP flow bugs, but not | |
229 | * cause security problems by really opening remote connections. | |
230 | * | |
231 | * This is based on the Samba LIBSMB_PROG feature. | |
06963d0f MP |
232 | * |
233 | * @param bind_address Local address to use. Normally NULL to get the stack default. | |
eecd22ff MP |
234 | **/ |
235 | int open_socket_out_wrapped (char *host, | |
236 | int port, | |
d5d4b282 MP |
237 | const char *bind_address, |
238 | int af_hint) | |
eecd22ff MP |
239 | { |
240 | char *prog; | |
241 | ||
242 | if ((prog = getenv ("RSYNC_CONNECT_PROG")) != NULL) | |
243 | return sock_exec (prog); | |
244 | else | |
d5d4b282 MP |
245 | return open_socket_out (host, port, bind_address, |
246 | af_hint); | |
eecd22ff MP |
247 | } |
248 | ||
249 | ||
250 | ||
06963d0f MP |
251 | /** |
252 | * Open a socket of the specified type, port and address for incoming data | |
253 | * | |
b8771f96 MP |
254 | * Try to be better about handling the results of getaddrinfo(): when |
255 | * opening an inbound socket, we might get several address results, | |
256 | * e.g. for the machine's ipv4 and ipv6 name. | |
257 | * | |
258 | * If binding a wildcard, then any one of them should do. If an address | |
259 | * was specified but it's insufficiently specific then that's not our | |
260 | * fault. | |
261 | * | |
262 | * However, some of the advertized addresses may not work because e.g. we | |
263 | * don't have IPv6 support in the kernel. In that case go on and try all | |
264 | * addresses until one succeeds. | |
265 | * | |
06963d0f MP |
266 | * @param bind_address Local address to bind, or NULL to allow it to |
267 | * default. | |
268 | **/ | |
d5d4b282 MP |
269 | static int open_socket_in(int type, int port, const char *bind_address, |
270 | int af_hint) | |
f0fca04e | 271 | { |
f0fca04e | 272 | int one=1; |
06963d0f | 273 | int s; |
b8771f96 | 274 | struct addrinfo hints, *res, *resp; |
06963d0f MP |
275 | char portbuf[10]; |
276 | int error; | |
277 | ||
278 | memset(&hints, 0, sizeof(hints)); | |
d5d4b282 | 279 | hints.ai_family = af_hint; |
06963d0f MP |
280 | hints.ai_socktype = type; |
281 | hints.ai_flags = AI_PASSIVE; | |
282 | snprintf(portbuf, sizeof(portbuf), "%d", port); | |
283 | error = getaddrinfo(bind_address, portbuf, &hints, &res); | |
284 | if (error) { | |
7ef6aa64 MP |
285 | rprintf(FERROR, RSYNC_NAME ": getaddrinfo: bind address %s: %s\n", |
286 | bind_address, gai_strerror(error)); | |
06963d0f MP |
287 | return -1; |
288 | } | |
b8771f96 MP |
289 | /* XXX: Do we need to care about getting multiple results |
290 | * back? I think probably not; if the user passed | |
291 | * bind_address == NULL and we set AI_PASSIVE then we ought to | |
292 | * get a wildcard result. */ | |
06963d0f | 293 | |
b8771f96 MP |
294 | resp = res; |
295 | while (1) { | |
296 | s = socket(resp->ai_family, resp->ai_socktype, resp->ai_protocol); | |
297 | ||
298 | if (s >= 0) { | |
299 | break; /* got a socket */ | |
300 | } else if ((resp = resp->ai_next)) { | |
301 | switch (errno) { | |
302 | case EPROTONOSUPPORT: | |
303 | case EAFNOSUPPORT: | |
304 | case EPFNOSUPPORT: | |
305 | /* See if there's another address that will work... */ | |
306 | continue; | |
307 | } | |
308 | } | |
309 | ||
310 | rprintf(FERROR, RSYNC_NAME ": open inbound socket" | |
311 | "(dom=%d, type=%d, proto=%d) failed: %s\n", | |
312 | resp->ai_family, resp->ai_socktype, resp->ai_protocol, | |
313 | strerror(errno)); | |
314 | goto fail; | |
f0fca04e AT |
315 | } |
316 | ||
06963d0f | 317 | setsockopt(s,SOL_SOCKET,SO_REUSEADDR,(char *)&one,sizeof(one)); |
f0fca04e AT |
318 | |
319 | /* now we've got a socket - we need to bind it */ | |
06963d0f MP |
320 | if (bind(s, res->ai_addr, res->ai_addrlen) < 0) { |
321 | rprintf(FERROR, RSYNC_NAME ": bind failed on port %d\n", port); | |
b8771f96 MP |
322 | close(s); |
323 | goto fail; | |
f0fca04e AT |
324 | } |
325 | ||
06963d0f | 326 | return s; |
b8771f96 MP |
327 | |
328 | fail: | |
329 | freeaddrinfo(res); | |
330 | return -1; | |
f0fca04e AT |
331 | } |
332 | ||
333 | ||
7c1b4daa MP |
334 | /* |
335 | * Determine if a file descriptor is in fact a socket | |
336 | */ | |
f0fca04e AT |
337 | int is_a_socket(int fd) |
338 | { | |
ac2a1a44 MP |
339 | int v; |
340 | socklen_t l; | |
3eb38818 | 341 | l = sizeof(int); |
7c1b4daa MP |
342 | |
343 | /* Parameters to getsockopt, setsockopt etc are very | |
344 | * unstandardized across platforms, so don't be surprised if | |
ac2a1a44 MP |
345 | * there are compiler warnings on e.g. SCO OpenSwerver or AIX. |
346 | * It seems they all eventually get the right idea. | |
7c1b4daa MP |
347 | * |
348 | * Debian says: ``The fifth argument of getsockopt and | |
349 | * setsockopt is in reality an int [*] (and this is what BSD | |
350 | * 4.* and libc4 and libc5 have). Some POSIX confusion | |
351 | * resulted in the present socklen_t. The draft standard has | |
352 | * not been adopted yet, but glibc2 already follows it and | |
353 | * also has socklen_t [*]. See also accept(2).'' | |
354 | * | |
355 | * We now return to your regularly scheduled programming. */ | |
3eb38818 | 356 | return(getsockopt(fd, SOL_SOCKET, SO_TYPE, (char *)&v, &l) == 0); |
f0fca04e AT |
357 | } |
358 | ||
359 | ||
8ef4ffd6 | 360 | void start_accept_loop(int port, int (*fn)(int )) |
f0fca04e AT |
361 | { |
362 | int s; | |
06963d0f | 363 | extern char *bind_address; |
f0fca04e | 364 | |
f0fca04e | 365 | /* open an incoming socket */ |
d5d4b282 MP |
366 | s = open_socket_in(SOCK_STREAM, port, bind_address, |
367 | global_opts.af_hint); | |
f0fca04e | 368 | if (s == -1) |
65417579 | 369 | exit_cleanup(RERR_SOCKETIO); |
f0fca04e AT |
370 | |
371 | /* ready to listen */ | |
372 | if (listen(s, 5) == -1) { | |
373 | close(s); | |
65417579 | 374 | exit_cleanup(RERR_SOCKETIO); |
f0fca04e AT |
375 | } |
376 | ||
377 | ||
378 | /* now accept incoming connections - forking a new process | |
379 | for each incoming connection */ | |
380 | while (1) { | |
381 | fd_set fds; | |
382 | int fd; | |
2d6dbe29 MP |
383 | struct sockaddr_storage addr; |
384 | int addrlen = sizeof(addr); | |
f0fca04e | 385 | |
15b84e14 DD |
386 | /* close log file before the potentially very long select so |
387 | file can be trimmed by another process instead of growing | |
388 | forever */ | |
389 | log_close(); | |
45a83540 | 390 | |
f0fca04e AT |
391 | FD_ZERO(&fds); |
392 | FD_SET(s, &fds); | |
393 | ||
394 | if (select(s+1, &fds, NULL, NULL, NULL) != 1) { | |
395 | continue; | |
396 | } | |
397 | ||
398 | if(!FD_ISSET(s, &fds)) continue; | |
399 | ||
2d6dbe29 | 400 | fd = accept(s,(struct sockaddr *)&addr,&addrlen); |
f0fca04e AT |
401 | |
402 | if (fd == -1) continue; | |
403 | ||
31f440e6 AT |
404 | signal(SIGCHLD, SIG_IGN); |
405 | ||
406 | /* we shouldn't have any children left hanging around | |
407 | but I have had reports that on Digital Unix zombies | |
408 | are produced, so this ensures that they are reaped */ | |
409 | #ifdef WNOHANG | |
0503f060 | 410 | while (waitpid(-1, NULL, WNOHANG) > 0); |
31f440e6 AT |
411 | #endif |
412 | ||
f0fca04e AT |
413 | if (fork()==0) { |
414 | close(s); | |
15b84e14 DD |
415 | /* open log file in child before possibly giving |
416 | up privileges */ | |
417 | log_open(); | |
f0fca04e AT |
418 | _exit(fn(fd)); |
419 | } | |
420 | ||
421 | close(fd); | |
422 | } | |
f0fca04e AT |
423 | } |
424 | ||
425 | ||
426 | enum SOCK_OPT_TYPES {OPT_BOOL,OPT_INT,OPT_ON}; | |
427 | ||
428 | struct | |
429 | { | |
430 | char *name; | |
431 | int level; | |
432 | int option; | |
433 | int value; | |
434 | int opttype; | |
435 | } socket_options[] = { | |
436 | {"SO_KEEPALIVE", SOL_SOCKET, SO_KEEPALIVE, 0, OPT_BOOL}, | |
437 | {"SO_REUSEADDR", SOL_SOCKET, SO_REUSEADDR, 0, OPT_BOOL}, | |
438 | {"SO_BROADCAST", SOL_SOCKET, SO_BROADCAST, 0, OPT_BOOL}, | |
439 | #ifdef TCP_NODELAY | |
440 | {"TCP_NODELAY", IPPROTO_TCP, TCP_NODELAY, 0, OPT_BOOL}, | |
441 | #endif | |
442 | #ifdef IPTOS_LOWDELAY | |
443 | {"IPTOS_LOWDELAY", IPPROTO_IP, IP_TOS, IPTOS_LOWDELAY, OPT_ON}, | |
444 | #endif | |
445 | #ifdef IPTOS_THROUGHPUT | |
446 | {"IPTOS_THROUGHPUT", IPPROTO_IP, IP_TOS, IPTOS_THROUGHPUT, OPT_ON}, | |
447 | #endif | |
448 | #ifdef SO_SNDBUF | |
449 | {"SO_SNDBUF", SOL_SOCKET, SO_SNDBUF, 0, OPT_INT}, | |
450 | #endif | |
451 | #ifdef SO_RCVBUF | |
452 | {"SO_RCVBUF", SOL_SOCKET, SO_RCVBUF, 0, OPT_INT}, | |
453 | #endif | |
454 | #ifdef SO_SNDLOWAT | |
455 | {"SO_SNDLOWAT", SOL_SOCKET, SO_SNDLOWAT, 0, OPT_INT}, | |
456 | #endif | |
457 | #ifdef SO_RCVLOWAT | |
458 | {"SO_RCVLOWAT", SOL_SOCKET, SO_RCVLOWAT, 0, OPT_INT}, | |
459 | #endif | |
460 | #ifdef SO_SNDTIMEO | |
461 | {"SO_SNDTIMEO", SOL_SOCKET, SO_SNDTIMEO, 0, OPT_INT}, | |
462 | #endif | |
463 | #ifdef SO_RCVTIMEO | |
464 | {"SO_RCVTIMEO", SOL_SOCKET, SO_RCVTIMEO, 0, OPT_INT}, | |
465 | #endif | |
466 | {NULL,0,0,0,0}}; | |
467 | ||
468 | ||
469 | ||
470 | /**************************************************************************** | |
471 | set user socket options | |
472 | ****************************************************************************/ | |
473 | void set_socket_options(int fd, char *options) | |
474 | { | |
475 | char *tok; | |
a6801c39 AT |
476 | if (!options || !*options) return; |
477 | ||
f0fca04e AT |
478 | options = strdup(options); |
479 | ||
480 | if (!options) out_of_memory("set_socket_options"); | |
481 | ||
482 | for (tok=strtok(options, " \t,"); tok; tok=strtok(NULL," \t,")) { | |
483 | int ret=0,i; | |
484 | int value = 1; | |
485 | char *p; | |
486 | int got_value = 0; | |
487 | ||
488 | if ((p = strchr(tok,'='))) { | |
489 | *p = 0; | |
490 | value = atoi(p+1); | |
491 | got_value = 1; | |
492 | } | |
493 | ||
494 | for (i=0;socket_options[i].name;i++) | |
495 | if (strcmp(socket_options[i].name,tok)==0) | |
496 | break; | |
497 | ||
498 | if (!socket_options[i].name) { | |
499 | rprintf(FERROR,"Unknown socket option %s\n",tok); | |
500 | continue; | |
501 | } | |
502 | ||
503 | switch (socket_options[i].opttype) { | |
504 | case OPT_BOOL: | |
505 | case OPT_INT: | |
506 | ret = setsockopt(fd,socket_options[i].level, | |
507 | socket_options[i].option,(char *)&value,sizeof(int)); | |
508 | break; | |
509 | ||
510 | case OPT_ON: | |
511 | if (got_value) | |
512 | rprintf(FERROR,"syntax error - %s does not take a value\n",tok); | |
513 | ||
514 | { | |
515 | int on = socket_options[i].value; | |
516 | ret = setsockopt(fd,socket_options[i].level, | |
517 | socket_options[i].option,(char *)&on,sizeof(int)); | |
518 | } | |
519 | break; | |
520 | } | |
521 | ||
522 | if (ret != 0) | |
660c6fbd MP |
523 | rprintf(FERROR, "failed to set socket option %s: %s\n", tok, |
524 | strerror(errno)); | |
f0fca04e AT |
525 | } |
526 | ||
527 | free(options); | |
528 | } | |
529 | ||
530 | /**************************************************************************** | |
531 | become a daemon, discarding the controlling terminal | |
532 | ****************************************************************************/ | |
533 | void become_daemon(void) | |
534 | { | |
b11ed3b1 AT |
535 | int i; |
536 | ||
c46ded46 | 537 | if (fork()) { |
f0fca04e | 538 | _exit(0); |
c46ded46 | 539 | } |
f0fca04e AT |
540 | |
541 | /* detach from the terminal */ | |
542 | #ifdef HAVE_SETSID | |
543 | setsid(); | |
544 | #else | |
545 | #ifdef TIOCNOTTY | |
c46ded46 AT |
546 | i = open("/dev/tty", O_RDWR); |
547 | if (i >= 0) { | |
548 | ioctl(i, (int) TIOCNOTTY, (char *)0); | |
549 | close(i); | |
f0fca04e AT |
550 | } |
551 | #endif /* TIOCNOTTY */ | |
552 | #endif | |
b11ed3b1 AT |
553 | /* make sure that stdin, stdout an stderr don't stuff things |
554 | up (library functions, for example) */ | |
555 | for (i=0;i<3;i++) { | |
556 | close(i); | |
557 | open("/dev/null", O_RDWR); | |
558 | } | |
bc2e93eb | 559 | } |
ff8b29b8 | 560 | |
1f0fa931 MP |
561 | /** |
562 | * Return the IP addr of the client as a string | |
563 | **/ | |
ff8b29b8 AT |
564 | char *client_addr(int fd) |
565 | { | |
2d6dbe29 | 566 | struct sockaddr_storage ss; |
06963d0f | 567 | int length = sizeof(ss); |
ff8b29b8 | 568 | static char addr_buf[100]; |
11a5a3c7 AT |
569 | static int initialised; |
570 | ||
571 | if (initialised) return addr_buf; | |
572 | ||
573 | initialised = 1; | |
ff8b29b8 | 574 | |
2d6dbe29 | 575 | if (getpeername(fd, (struct sockaddr *)&ss, &length)) { |
65417579 | 576 | exit_cleanup(RERR_SOCKETIO); |
ff8b29b8 | 577 | } |
06963d0f | 578 | |
2d6dbe29 | 579 | getnameinfo((struct sockaddr *)&ss, length, |
06963d0f | 580 | addr_buf, sizeof(addr_buf), NULL, 0, NI_NUMERICHOST); |
ff8b29b8 AT |
581 | return addr_buf; |
582 | } | |
583 | ||
584 | ||
1f0fa931 MP |
585 | /** |
586 | * Return the DNS name of the client | |
587 | **/ | |
ff8b29b8 AT |
588 | char *client_name(int fd) |
589 | { | |
2d6dbe29 | 590 | struct sockaddr_storage ss; |
06963d0f | 591 | int length = sizeof(ss); |
ff8b29b8 | 592 | static char name_buf[100]; |
06963d0f | 593 | static char port_buf[100]; |
de5fb374 | 594 | char *def = "UNKNOWN"; |
11a5a3c7 | 595 | static int initialised; |
06963d0f MP |
596 | struct addrinfo hints, *res, *res0; |
597 | int error; | |
11a5a3c7 AT |
598 | |
599 | if (initialised) return name_buf; | |
600 | ||
601 | initialised = 1; | |
ff8b29b8 | 602 | |
de5fb374 | 603 | strcpy(name_buf,def); |
ff8b29b8 | 604 | |
06963d0f | 605 | if (getpeername(fd, (struct sockaddr *)&ss, &length)) { |
d5d4b282 MP |
606 | /* FIXME: Can we really not continue? */ |
607 | rprintf(FERROR, RSYNC_NAME ": getpeername on fd%d failed: %s\n", | |
c11b8806 | 608 | fd, strerror(errno)); |
65417579 | 609 | exit_cleanup(RERR_SOCKETIO); |
ff8b29b8 AT |
610 | } |
611 | ||
06963d0f | 612 | #ifdef INET6 |
2d6dbe29 | 613 | if (ss.ss_family == AF_INET6 && |
06963d0f MP |
614 | IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6 *)&ss)->sin6_addr)) { |
615 | struct sockaddr_in6 sin6; | |
616 | struct sockaddr_in *sin; | |
617 | ||
618 | memcpy(&sin6, &ss, sizeof(sin6)); | |
619 | sin = (struct sockaddr_in *)&ss; | |
620 | memset(sin, 0, sizeof(*sin)); | |
621 | sin->sin_family = AF_INET; | |
622 | length = sizeof(struct sockaddr_in); | |
623 | #ifdef HAVE_SOCKADDR_LEN | |
624 | sin->sin_len = length; | |
625 | #endif | |
626 | sin->sin_port = sin6.sin6_port; | |
627 | memcpy(&sin->sin_addr, &sin6.sin6_addr.s6_addr[12], | |
628 | sizeof(sin->sin_addr)); | |
629 | } | |
630 | #endif | |
631 | ||
632 | /* reverse lookup */ | |
633 | if (getnameinfo((struct sockaddr *)&ss, length, | |
634 | name_buf, sizeof(name_buf), port_buf, sizeof(port_buf), | |
635 | NI_NAMEREQD | NI_NUMERICSERV) != 0) { | |
636 | strcpy(name_buf, def); | |
637 | rprintf(FERROR, "reverse name lookup failed\n"); | |
ff8b29b8 AT |
638 | } |
639 | ||
06963d0f MP |
640 | /* forward lookup */ |
641 | memset(&hints, 0, sizeof(hints)); | |
642 | hints.ai_family = PF_UNSPEC; | |
643 | hints.ai_flags = AI_CANONNAME; | |
644 | hints.ai_socktype = SOCK_STREAM; | |
645 | error = getaddrinfo(name_buf, port_buf, &hints, &res0); | |
646 | if (error) { | |
647 | strcpy(name_buf, def); | |
7ef6aa64 MP |
648 | rprintf(FERROR, |
649 | RSYNC_NAME ": forward name lookup for %s failed: %s\n", | |
650 | port_buf, | |
651 | gai_strerror(error)); | |
06963d0f MP |
652 | return name_buf; |
653 | } | |
de5fb374 | 654 | |
06963d0f MP |
655 | /* XXX sin6_flowinfo and other fields */ |
656 | for (res = res0; res; res = res->ai_next) { | |
2d6dbe29 | 657 | if (res->ai_family != ss.ss_family) |
06963d0f MP |
658 | continue; |
659 | if (res->ai_addrlen != length) | |
660 | continue; | |
661 | if (memcmp(res->ai_addr, &ss, res->ai_addrlen) == 0) | |
662 | break; | |
663 | } | |
664 | ||
61f543ca | 665 | /* TODO: Do a forward lookup as well to prevent spoofing */ |
06963d0f MP |
666 | |
667 | if (res == NULL) { | |
668 | strcpy(name_buf, def); | |
d5d4b282 MP |
669 | rprintf(FERROR, RSYNC_NAME ": " |
670 | "reverse name lookup mismatch on fd%d - spoofed address?\n", | |
671 | fd); | |
de5fb374 AT |
672 | } |
673 | ||
06963d0f | 674 | freeaddrinfo(res0); |
ff8b29b8 AT |
675 | return name_buf; |
676 | } | |
5c9730a4 | 677 | |
eecd22ff MP |
678 | |
679 | /******************************************************************* | |
680 | this is like socketpair but uses tcp. It is used by the Samba | |
681 | regression test code | |
682 | The function guarantees that nobody else can attach to the socket, | |
683 | or if they do that this function fails and the socket gets closed | |
684 | returns 0 on success, -1 on failure | |
685 | the resulting file descriptors are symmetrical | |
686 | ******************************************************************/ | |
687 | static int socketpair_tcp(int fd[2]) | |
688 | { | |
689 | int listener; | |
690 | struct sockaddr_in sock; | |
691 | struct sockaddr_in sock2; | |
692 | socklen_t socklen = sizeof(sock); | |
693 | int connect_done = 0; | |
694 | ||
695 | fd[0] = fd[1] = listener = -1; | |
696 | ||
697 | memset(&sock, 0, sizeof(sock)); | |
698 | ||
699 | if ((listener = socket(PF_INET, SOCK_STREAM, 0)) == -1) goto failed; | |
700 | ||
701 | memset(&sock2, 0, sizeof(sock2)); | |
702 | #ifdef HAVE_SOCK_SIN_LEN | |
703 | sock2.sin_len = sizeof(sock2); | |
704 | #endif | |
705 | sock2.sin_family = PF_INET; | |
706 | ||
707 | bind(listener, (struct sockaddr *)&sock2, sizeof(sock2)); | |
708 | ||
709 | if (listen(listener, 1) != 0) goto failed; | |
710 | ||
711 | if (getsockname(listener, (struct sockaddr *)&sock, &socklen) != 0) goto failed; | |
712 | ||
713 | if ((fd[1] = socket(PF_INET, SOCK_STREAM, 0)) == -1) goto failed; | |
714 | ||
715 | set_nonblocking(fd[1]); | |
716 | ||
717 | sock.sin_addr.s_addr = htonl(INADDR_LOOPBACK); | |
718 | ||
719 | if (connect(fd[1],(struct sockaddr *)&sock,sizeof(sock)) == -1) { | |
720 | if (errno != EINPROGRESS) goto failed; | |
721 | } else { | |
722 | connect_done = 1; | |
723 | } | |
724 | ||
725 | if ((fd[0] = accept(listener, (struct sockaddr *)&sock, &socklen)) == -1) goto failed; | |
726 | ||
727 | close(listener); | |
728 | if (connect_done == 0) { | |
729 | if (connect(fd[1],(struct sockaddr *)&sock,sizeof(sock)) != 0 | |
730 | && errno != EISCONN) goto failed; | |
731 | } | |
732 | ||
733 | set_blocking (fd[1]); | |
734 | ||
735 | /* all OK! */ | |
736 | return 0; | |
737 | ||
738 | failed: | |
739 | if (fd[0] != -1) close(fd[0]); | |
740 | if (fd[1] != -1) close(fd[1]); | |
741 | if (listener != -1) close(listener); | |
742 | return -1; | |
743 | } | |
744 | ||
745 | ||
746 | /******************************************************************* | |
747 | run a program on a local tcp socket, this is used to launch smbd | |
748 | when regression testing | |
749 | the return value is a socket which is attached to a subprocess | |
750 | running "prog". stdin and stdout are attached. stderr is left | |
751 | attached to the original stderr | |
752 | ******************************************************************/ | |
753 | int sock_exec(const char *prog) | |
754 | { | |
755 | int fd[2]; | |
756 | if (socketpair_tcp(fd) != 0) { | |
757 | rprintf (FERROR, RSYNC_NAME | |
758 | ": socketpair_tcp failed (%s)\n", | |
759 | strerror(errno)); | |
760 | return -1; | |
761 | } | |
762 | if (fork() == 0) { | |
763 | close(fd[0]); | |
764 | close(0); | |
765 | close(1); | |
766 | dup(fd[1]); | |
767 | dup(fd[1]); | |
768 | if (verbose > 3) | |
769 | fprintf (stderr, | |
770 | RSYNC_NAME ": execute socket program \"%s\"\n", | |
771 | prog); | |
772 | exit (system (prog)); | |
773 | } | |
774 | close (fd[1]); | |
775 | return fd[0]; | |
776 | } | |
777 | ||
778 | ||
779 |