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 | ||
660c6fbd MP |
29 | /* Establish a proxy connection on an open socket to a web roxy by |
30 | * using the CONNECT method. */ | |
4c3b4b25 AT |
31 | static int establish_proxy_connection(int fd, char *host, int port) |
32 | { | |
33 | char buffer[1024]; | |
34 | char *cp; | |
35 | ||
8950ac03 | 36 | snprintf(buffer, sizeof(buffer), "CONNECT %s:%d HTTP/1.0\r\n\r\n", host, port); |
4c3b4b25 | 37 | if (write(fd, buffer, strlen(buffer)) != strlen(buffer)) { |
660c6fbd | 38 | rprintf(FERROR, "failed to write to proxy: %s\n", |
4c3b4b25 AT |
39 | strerror(errno)); |
40 | return -1; | |
41 | } | |
42 | ||
43 | for (cp = buffer; cp < &buffer[sizeof(buffer) - 1]; cp++) { | |
44 | if (read(fd, cp, 1) != 1) { | |
660c6fbd MP |
45 | rprintf(FERROR, "failed to read from proxy: %s\n", |
46 | strerror(errno)); | |
4c3b4b25 AT |
47 | return -1; |
48 | } | |
49 | if (*cp == '\n') | |
50 | break; | |
51 | } | |
52 | ||
53 | if (*cp != '\n') | |
54 | cp++; | |
55 | *cp-- = '\0'; | |
56 | if (*cp == '\r') | |
57 | *cp = '\0'; | |
58 | if (strncmp(buffer, "HTTP/", 5) != 0) { | |
59 | rprintf(FERROR, "bad response from proxy - %s\n", | |
60 | buffer); | |
61 | return -1; | |
62 | } | |
63 | for (cp = &buffer[5]; isdigit(*cp) || (*cp == '.'); cp++) | |
64 | ; | |
65 | while (*cp == ' ') | |
66 | cp++; | |
67 | if (*cp != '2') { | |
68 | rprintf(FERROR, "bad response from proxy - %s\n", | |
69 | buffer); | |
70 | return -1; | |
71 | } | |
72 | /* throw away the rest of the HTTP header */ | |
73 | while (1) { | |
74 | for (cp = buffer; cp < &buffer[sizeof(buffer) - 1]; | |
75 | cp++) { | |
76 | if (read(fd, cp, 1) != 1) { | |
660c6fbd MP |
77 | rprintf(FERROR, "failed to read from proxy: %s\n", |
78 | strerror(errno)); | |
4c3b4b25 AT |
79 | return -1; |
80 | } | |
81 | if (*cp == '\n') | |
82 | break; | |
83 | } | |
84 | if ((cp > buffer) && (*cp == '\n')) | |
85 | cp--; | |
86 | if ((cp == buffer) && ((*cp == '\n') || (*cp == '\r'))) | |
87 | break; | |
88 | } | |
89 | return 0; | |
90 | } | |
91 | ||
92 | ||
eecd22ff | 93 | |
d5d4b282 MP |
94 | /** |
95 | * Open a socket to a tcp remote host with the specified port . | |
06963d0f | 96 | * |
d5d4b282 MP |
97 | * Based on code from Warren. Proxy support by Stephen Rothwell. |
98 | * getaddrinfo() rewrite contributed by KAME.net. | |
06963d0f | 99 | * |
d5d4b282 MP |
100 | * Now that we support IPv6 we need to look up the remote machine's |
101 | * address first, using @p af_hint to set a preference for the type | |
102 | * of address. Then depending on whether it has v4 or v6 addresses we | |
103 | * try to open a connection. | |
06963d0f | 104 | * |
d5d4b282 MP |
105 | * The loop allows for machines with some addresses which may not be |
106 | * reachable, perhaps because we can't e.g. route ipv6 to that network | |
107 | * but we can get ip4 packets through. | |
108 | * | |
109 | * @param bind_address Local address to use. Normally NULL to bind | |
110 | * the wildcard address. | |
111 | * | |
112 | * @param af_hint Address family, e.g. AF_INET or AF_INET6. | |
06963d0f | 113 | **/ |
d5d4b282 MP |
114 | int open_socket_out(char *host, int port, const char *bind_address, |
115 | int af_hint) | |
bc2e93eb | 116 | { |
f0fca04e | 117 | int type = SOCK_STREAM; |
06963d0f MP |
118 | int error; |
119 | int s; | |
120 | int result; | |
121 | struct addrinfo hints, *res0, *res; | |
122 | char portbuf[10]; | |
4c3b4b25 | 123 | char *h; |
4c3b4b25 AT |
124 | int proxied = 0; |
125 | char buffer[1024]; | |
126 | char *cp; | |
127 | ||
660c6fbd MP |
128 | /* if we have a RSYNC_PROXY env variable then redirect our |
129 | * connetcion via a web proxy at the given address. The format | |
130 | * is hostname:port */ | |
4c3b4b25 AT |
131 | h = getenv("RSYNC_PROXY"); |
132 | proxied = (h != NULL) && (*h != '\0'); | |
133 | ||
134 | if (proxied) { | |
135 | strlcpy(buffer, h, sizeof(buffer)); | |
136 | cp = strchr(buffer, ':'); | |
137 | if (cp == NULL) { | |
660c6fbd MP |
138 | rprintf(FERROR, |
139 | "invalid proxy specification: should be HOST:PORT\n"); | |
4c3b4b25 AT |
140 | return -1; |
141 | } | |
142 | *cp++ = '\0'; | |
06963d0f | 143 | strcpy(portbuf, cp); |
4c3b4b25 AT |
144 | h = buffer; |
145 | } else { | |
06963d0f | 146 | snprintf(portbuf, sizeof(portbuf), "%d", port); |
4c3b4b25 | 147 | h = host; |
4c3b4b25 | 148 | } |
f0fca04e | 149 | |
06963d0f | 150 | memset(&hints, 0, sizeof(hints)); |
d5d4b282 | 151 | hints.ai_family = af_hint; |
06963d0f MP |
152 | hints.ai_socktype = type; |
153 | error = getaddrinfo(h, portbuf, &hints, &res0); | |
154 | if (error) { | |
d5d4b282 MP |
155 | rprintf(FERROR, RSYNC_NAME ": getaddrinfo: %s %s: %s\n", |
156 | h, portbuf, gai_strerror(error)); | |
f0fca04e AT |
157 | return -1; |
158 | } | |
159 | ||
06963d0f | 160 | s = -1; |
2d6dbe29 MP |
161 | /* Try to connect to all addresses for this machine until we get |
162 | * through. It might e.g. be multi-homed, or have both IPv4 and IPv6 | |
163 | * addresses. We need to create a socket for each record, since the | |
164 | * address record tells us what protocol to use to try to connect. */ | |
06963d0f MP |
165 | for (res = res0; res; res = res->ai_next) { |
166 | s = socket(res->ai_family, res->ai_socktype, res->ai_protocol); | |
167 | if (s < 0) | |
168 | continue; | |
f0fca04e | 169 | |
06963d0f MP |
170 | if (bind_address) { |
171 | struct addrinfo bhints, *bres; | |
172 | ||
173 | memset(&bhints, 0, sizeof(bhints)); | |
174 | bhints.ai_family = res->ai_family; | |
175 | bhints.ai_socktype = type; | |
176 | bhints.ai_flags = AI_PASSIVE; | |
177 | error = getaddrinfo(bind_address, NULL, &bhints, &bres); | |
178 | if (error) { | |
2d6dbe29 MP |
179 | rprintf(FERROR, RSYNC_NAME ": getaddrinfo: " |
180 | "bind address %s <noport>: %s\n", | |
7ef6aa64 | 181 | bind_address, gai_strerror(error)); |
06963d0f MP |
182 | continue; |
183 | } | |
184 | if (bres->ai_next) { | |
2d6dbe29 MP |
185 | /* I'm not at all sure that this is the right |
186 | * response here... -- mbp */ | |
187 | rprintf(FERROR, RSYNC_NAME ": getaddrinfo: " | |
188 | "bind address %s resolved to multiple hosts\n", | |
7ef6aa64 | 189 | bind_address); |
06963d0f MP |
190 | freeaddrinfo(bres); |
191 | continue; | |
192 | } | |
193 | bind(s, bres->ai_addr, bres->ai_addrlen); | |
194 | } | |
e30f0657 | 195 | |
06963d0f MP |
196 | if (connect(s, res->ai_addr, res->ai_addrlen) < 0) { |
197 | close(s); | |
198 | s = -1; | |
199 | continue; | |
200 | } | |
201 | if (proxied && | |
202 | establish_proxy_connection(s, host, port) != 0) { | |
203 | close(s); | |
204 | s = -1; | |
205 | continue; | |
206 | } else | |
207 | break; | |
4c3b4b25 | 208 | } |
06963d0f MP |
209 | freeaddrinfo(res0); |
210 | if (s < 0) { | |
7ef6aa64 MP |
211 | rprintf(FERROR, RSYNC_NAME ": failed to connect to %s: %s\n", |
212 | h, strerror(errno)); | |
f0fca04e AT |
213 | return -1; |
214 | } | |
06963d0f | 215 | return s; |
f0fca04e AT |
216 | } |
217 | ||
218 | ||
eecd22ff MP |
219 | /** |
220 | * Open an outgoing socket, but allow for it to be intercepted by | |
221 | * $RSYNC_CONNECT_PROG, which will execute a program across a TCP | |
222 | * socketpair rather than really opening a socket. | |
223 | * | |
224 | * We use this primarily in testing to detect TCP flow bugs, but not | |
225 | * cause security problems by really opening remote connections. | |
226 | * | |
227 | * This is based on the Samba LIBSMB_PROG feature. | |
06963d0f MP |
228 | * |
229 | * @param bind_address Local address to use. Normally NULL to get the stack default. | |
eecd22ff MP |
230 | **/ |
231 | int open_socket_out_wrapped (char *host, | |
232 | int port, | |
d5d4b282 MP |
233 | const char *bind_address, |
234 | int af_hint) | |
eecd22ff MP |
235 | { |
236 | char *prog; | |
237 | ||
238 | if ((prog = getenv ("RSYNC_CONNECT_PROG")) != NULL) | |
239 | return sock_exec (prog); | |
240 | else | |
d5d4b282 MP |
241 | return open_socket_out (host, port, bind_address, |
242 | af_hint); | |
eecd22ff MP |
243 | } |
244 | ||
245 | ||
246 | ||
06963d0f MP |
247 | /** |
248 | * Open a socket of the specified type, port and address for incoming data | |
249 | * | |
b8771f96 MP |
250 | * Try to be better about handling the results of getaddrinfo(): when |
251 | * opening an inbound socket, we might get several address results, | |
252 | * e.g. for the machine's ipv4 and ipv6 name. | |
253 | * | |
254 | * If binding a wildcard, then any one of them should do. If an address | |
255 | * was specified but it's insufficiently specific then that's not our | |
256 | * fault. | |
257 | * | |
258 | * However, some of the advertized addresses may not work because e.g. we | |
259 | * don't have IPv6 support in the kernel. In that case go on and try all | |
260 | * addresses until one succeeds. | |
261 | * | |
06963d0f MP |
262 | * @param bind_address Local address to bind, or NULL to allow it to |
263 | * default. | |
264 | **/ | |
d5d4b282 MP |
265 | static int open_socket_in(int type, int port, const char *bind_address, |
266 | int af_hint) | |
f0fca04e | 267 | { |
f0fca04e | 268 | int one=1; |
06963d0f | 269 | int s; |
b8771f96 | 270 | struct addrinfo hints, *res, *resp; |
06963d0f MP |
271 | char portbuf[10]; |
272 | int error; | |
273 | ||
274 | memset(&hints, 0, sizeof(hints)); | |
d5d4b282 | 275 | hints.ai_family = af_hint; |
06963d0f MP |
276 | hints.ai_socktype = type; |
277 | hints.ai_flags = AI_PASSIVE; | |
278 | snprintf(portbuf, sizeof(portbuf), "%d", port); | |
279 | error = getaddrinfo(bind_address, portbuf, &hints, &res); | |
280 | if (error) { | |
7ef6aa64 MP |
281 | rprintf(FERROR, RSYNC_NAME ": getaddrinfo: bind address %s: %s\n", |
282 | bind_address, gai_strerror(error)); | |
06963d0f MP |
283 | return -1; |
284 | } | |
b8771f96 MP |
285 | /* XXX: Do we need to care about getting multiple results |
286 | * back? I think probably not; if the user passed | |
287 | * bind_address == NULL and we set AI_PASSIVE then we ought to | |
288 | * get a wildcard result. */ | |
06963d0f | 289 | |
b8771f96 MP |
290 | resp = res; |
291 | while (1) { | |
292 | s = socket(resp->ai_family, resp->ai_socktype, resp->ai_protocol); | |
293 | ||
294 | if (s >= 0) { | |
295 | break; /* got a socket */ | |
296 | } else if ((resp = resp->ai_next)) { | |
297 | switch (errno) { | |
298 | case EPROTONOSUPPORT: | |
299 | case EAFNOSUPPORT: | |
300 | case EPFNOSUPPORT: | |
cb1bcc7e | 301 | case EINVAL: |
b8771f96 MP |
302 | /* See if there's another address that will work... */ |
303 | continue; | |
304 | } | |
305 | } | |
306 | ||
307 | rprintf(FERROR, RSYNC_NAME ": open inbound socket" | |
308 | "(dom=%d, type=%d, proto=%d) failed: %s\n", | |
309 | resp->ai_family, resp->ai_socktype, resp->ai_protocol, | |
310 | strerror(errno)); | |
311 | goto fail; | |
f0fca04e AT |
312 | } |
313 | ||
06963d0f | 314 | setsockopt(s,SOL_SOCKET,SO_REUSEADDR,(char *)&one,sizeof(one)); |
f0fca04e AT |
315 | |
316 | /* now we've got a socket - we need to bind it */ | |
06963d0f MP |
317 | if (bind(s, res->ai_addr, res->ai_addrlen) < 0) { |
318 | rprintf(FERROR, RSYNC_NAME ": bind failed on port %d\n", port); | |
b8771f96 MP |
319 | close(s); |
320 | goto fail; | |
f0fca04e AT |
321 | } |
322 | ||
06963d0f | 323 | return s; |
b8771f96 MP |
324 | |
325 | fail: | |
326 | freeaddrinfo(res); | |
327 | return -1; | |
f0fca04e AT |
328 | } |
329 | ||
330 | ||
7c1b4daa MP |
331 | /* |
332 | * Determine if a file descriptor is in fact a socket | |
333 | */ | |
f0fca04e AT |
334 | int is_a_socket(int fd) |
335 | { | |
ac2a1a44 MP |
336 | int v; |
337 | socklen_t l; | |
3eb38818 | 338 | l = sizeof(int); |
7c1b4daa MP |
339 | |
340 | /* Parameters to getsockopt, setsockopt etc are very | |
341 | * unstandardized across platforms, so don't be surprised if | |
ac2a1a44 MP |
342 | * there are compiler warnings on e.g. SCO OpenSwerver or AIX. |
343 | * It seems they all eventually get the right idea. | |
7c1b4daa MP |
344 | * |
345 | * Debian says: ``The fifth argument of getsockopt and | |
346 | * setsockopt is in reality an int [*] (and this is what BSD | |
347 | * 4.* and libc4 and libc5 have). Some POSIX confusion | |
348 | * resulted in the present socklen_t. The draft standard has | |
349 | * not been adopted yet, but glibc2 already follows it and | |
350 | * also has socklen_t [*]. See also accept(2).'' | |
351 | * | |
352 | * We now return to your regularly scheduled programming. */ | |
3eb38818 | 353 | return(getsockopt(fd, SOL_SOCKET, SO_TYPE, (char *)&v, &l) == 0); |
f0fca04e AT |
354 | } |
355 | ||
356 | ||
8ef4ffd6 | 357 | void start_accept_loop(int port, int (*fn)(int )) |
f0fca04e AT |
358 | { |
359 | int s; | |
06963d0f | 360 | extern char *bind_address; |
f0fca04e | 361 | |
f0fca04e | 362 | /* open an incoming socket */ |
d5d4b282 MP |
363 | s = open_socket_in(SOCK_STREAM, port, bind_address, |
364 | global_opts.af_hint); | |
f0fca04e | 365 | if (s == -1) |
65417579 | 366 | exit_cleanup(RERR_SOCKETIO); |
f0fca04e AT |
367 | |
368 | /* ready to listen */ | |
369 | if (listen(s, 5) == -1) { | |
370 | close(s); | |
65417579 | 371 | exit_cleanup(RERR_SOCKETIO); |
f0fca04e AT |
372 | } |
373 | ||
374 | ||
375 | /* now accept incoming connections - forking a new process | |
376 | for each incoming connection */ | |
377 | while (1) { | |
378 | fd_set fds; | |
379 | int fd; | |
2d6dbe29 MP |
380 | struct sockaddr_storage addr; |
381 | int addrlen = sizeof(addr); | |
f0fca04e | 382 | |
15b84e14 DD |
383 | /* close log file before the potentially very long select so |
384 | file can be trimmed by another process instead of growing | |
385 | forever */ | |
386 | log_close(); | |
45a83540 | 387 | |
f0fca04e AT |
388 | FD_ZERO(&fds); |
389 | FD_SET(s, &fds); | |
390 | ||
391 | if (select(s+1, &fds, NULL, NULL, NULL) != 1) { | |
392 | continue; | |
393 | } | |
394 | ||
395 | if(!FD_ISSET(s, &fds)) continue; | |
396 | ||
2d6dbe29 | 397 | fd = accept(s,(struct sockaddr *)&addr,&addrlen); |
f0fca04e AT |
398 | |
399 | if (fd == -1) continue; | |
400 | ||
31f440e6 AT |
401 | signal(SIGCHLD, SIG_IGN); |
402 | ||
403 | /* we shouldn't have any children left hanging around | |
404 | but I have had reports that on Digital Unix zombies | |
405 | are produced, so this ensures that they are reaped */ | |
406 | #ifdef WNOHANG | |
0503f060 | 407 | while (waitpid(-1, NULL, WNOHANG) > 0); |
31f440e6 AT |
408 | #endif |
409 | ||
f0fca04e AT |
410 | if (fork()==0) { |
411 | close(s); | |
15b84e14 DD |
412 | /* open log file in child before possibly giving |
413 | up privileges */ | |
414 | log_open(); | |
f0fca04e AT |
415 | _exit(fn(fd)); |
416 | } | |
417 | ||
418 | close(fd); | |
419 | } | |
f0fca04e AT |
420 | } |
421 | ||
422 | ||
423 | enum SOCK_OPT_TYPES {OPT_BOOL,OPT_INT,OPT_ON}; | |
424 | ||
425 | struct | |
426 | { | |
427 | char *name; | |
428 | int level; | |
429 | int option; | |
430 | int value; | |
431 | int opttype; | |
432 | } socket_options[] = { | |
433 | {"SO_KEEPALIVE", SOL_SOCKET, SO_KEEPALIVE, 0, OPT_BOOL}, | |
434 | {"SO_REUSEADDR", SOL_SOCKET, SO_REUSEADDR, 0, OPT_BOOL}, | |
435 | {"SO_BROADCAST", SOL_SOCKET, SO_BROADCAST, 0, OPT_BOOL}, | |
436 | #ifdef TCP_NODELAY | |
437 | {"TCP_NODELAY", IPPROTO_TCP, TCP_NODELAY, 0, OPT_BOOL}, | |
438 | #endif | |
439 | #ifdef IPTOS_LOWDELAY | |
440 | {"IPTOS_LOWDELAY", IPPROTO_IP, IP_TOS, IPTOS_LOWDELAY, OPT_ON}, | |
441 | #endif | |
442 | #ifdef IPTOS_THROUGHPUT | |
443 | {"IPTOS_THROUGHPUT", IPPROTO_IP, IP_TOS, IPTOS_THROUGHPUT, OPT_ON}, | |
444 | #endif | |
445 | #ifdef SO_SNDBUF | |
446 | {"SO_SNDBUF", SOL_SOCKET, SO_SNDBUF, 0, OPT_INT}, | |
447 | #endif | |
448 | #ifdef SO_RCVBUF | |
449 | {"SO_RCVBUF", SOL_SOCKET, SO_RCVBUF, 0, OPT_INT}, | |
450 | #endif | |
451 | #ifdef SO_SNDLOWAT | |
452 | {"SO_SNDLOWAT", SOL_SOCKET, SO_SNDLOWAT, 0, OPT_INT}, | |
453 | #endif | |
454 | #ifdef SO_RCVLOWAT | |
455 | {"SO_RCVLOWAT", SOL_SOCKET, SO_RCVLOWAT, 0, OPT_INT}, | |
456 | #endif | |
457 | #ifdef SO_SNDTIMEO | |
458 | {"SO_SNDTIMEO", SOL_SOCKET, SO_SNDTIMEO, 0, OPT_INT}, | |
459 | #endif | |
460 | #ifdef SO_RCVTIMEO | |
461 | {"SO_RCVTIMEO", SOL_SOCKET, SO_RCVTIMEO, 0, OPT_INT}, | |
462 | #endif | |
463 | {NULL,0,0,0,0}}; | |
464 | ||
465 | ||
466 | ||
467 | /**************************************************************************** | |
468 | set user socket options | |
469 | ****************************************************************************/ | |
470 | void set_socket_options(int fd, char *options) | |
471 | { | |
472 | char *tok; | |
a6801c39 AT |
473 | if (!options || !*options) return; |
474 | ||
f0fca04e AT |
475 | options = strdup(options); |
476 | ||
477 | if (!options) out_of_memory("set_socket_options"); | |
478 | ||
479 | for (tok=strtok(options, " \t,"); tok; tok=strtok(NULL," \t,")) { | |
480 | int ret=0,i; | |
481 | int value = 1; | |
482 | char *p; | |
483 | int got_value = 0; | |
484 | ||
485 | if ((p = strchr(tok,'='))) { | |
486 | *p = 0; | |
487 | value = atoi(p+1); | |
488 | got_value = 1; | |
489 | } | |
490 | ||
491 | for (i=0;socket_options[i].name;i++) | |
492 | if (strcmp(socket_options[i].name,tok)==0) | |
493 | break; | |
494 | ||
495 | if (!socket_options[i].name) { | |
496 | rprintf(FERROR,"Unknown socket option %s\n",tok); | |
497 | continue; | |
498 | } | |
499 | ||
500 | switch (socket_options[i].opttype) { | |
501 | case OPT_BOOL: | |
502 | case OPT_INT: | |
503 | ret = setsockopt(fd,socket_options[i].level, | |
504 | socket_options[i].option,(char *)&value,sizeof(int)); | |
505 | break; | |
506 | ||
507 | case OPT_ON: | |
508 | if (got_value) | |
509 | rprintf(FERROR,"syntax error - %s does not take a value\n",tok); | |
510 | ||
511 | { | |
512 | int on = socket_options[i].value; | |
513 | ret = setsockopt(fd,socket_options[i].level, | |
514 | socket_options[i].option,(char *)&on,sizeof(int)); | |
515 | } | |
516 | break; | |
517 | } | |
518 | ||
519 | if (ret != 0) | |
660c6fbd MP |
520 | rprintf(FERROR, "failed to set socket option %s: %s\n", tok, |
521 | strerror(errno)); | |
f0fca04e AT |
522 | } |
523 | ||
524 | free(options); | |
525 | } | |
526 | ||
527 | /**************************************************************************** | |
528 | become a daemon, discarding the controlling terminal | |
529 | ****************************************************************************/ | |
530 | void become_daemon(void) | |
531 | { | |
b11ed3b1 AT |
532 | int i; |
533 | ||
c46ded46 | 534 | if (fork()) { |
f0fca04e | 535 | _exit(0); |
c46ded46 | 536 | } |
f0fca04e AT |
537 | |
538 | /* detach from the terminal */ | |
539 | #ifdef HAVE_SETSID | |
540 | setsid(); | |
541 | #else | |
542 | #ifdef TIOCNOTTY | |
c46ded46 AT |
543 | i = open("/dev/tty", O_RDWR); |
544 | if (i >= 0) { | |
545 | ioctl(i, (int) TIOCNOTTY, (char *)0); | |
546 | close(i); | |
f0fca04e AT |
547 | } |
548 | #endif /* TIOCNOTTY */ | |
549 | #endif | |
b11ed3b1 AT |
550 | /* make sure that stdin, stdout an stderr don't stuff things |
551 | up (library functions, for example) */ | |
552 | for (i=0;i<3;i++) { | |
553 | close(i); | |
554 | open("/dev/null", O_RDWR); | |
555 | } | |
bc2e93eb | 556 | } |
ff8b29b8 | 557 | |
1f0fa931 MP |
558 | /** |
559 | * Return the IP addr of the client as a string | |
560 | **/ | |
ff8b29b8 AT |
561 | char *client_addr(int fd) |
562 | { | |
2d6dbe29 | 563 | struct sockaddr_storage ss; |
06963d0f | 564 | int length = sizeof(ss); |
ff8b29b8 | 565 | static char addr_buf[100]; |
11a5a3c7 AT |
566 | static int initialised; |
567 | ||
568 | if (initialised) return addr_buf; | |
569 | ||
570 | initialised = 1; | |
ff8b29b8 | 571 | |
2d6dbe29 | 572 | if (getpeername(fd, (struct sockaddr *)&ss, &length)) { |
65417579 | 573 | exit_cleanup(RERR_SOCKETIO); |
ff8b29b8 | 574 | } |
06963d0f | 575 | |
2d6dbe29 | 576 | getnameinfo((struct sockaddr *)&ss, length, |
06963d0f | 577 | addr_buf, sizeof(addr_buf), NULL, 0, NI_NUMERICHOST); |
ff8b29b8 AT |
578 | return addr_buf; |
579 | } | |
580 | ||
581 | ||
51f289d1 | 582 | static int get_sockaddr_family(const struct sockaddr_storage *ss) |
d91c8c50 MP |
583 | { |
584 | return ((struct sockaddr *) ss)->sa_family; | |
585 | } | |
586 | ||
587 | ||
1f0fa931 MP |
588 | /** |
589 | * Return the DNS name of the client | |
590 | **/ | |
ff8b29b8 AT |
591 | char *client_name(int fd) |
592 | { | |
2d6dbe29 | 593 | struct sockaddr_storage ss; |
06963d0f | 594 | int length = sizeof(ss); |
ff8b29b8 | 595 | static char name_buf[100]; |
06963d0f | 596 | static char port_buf[100]; |
de5fb374 | 597 | char *def = "UNKNOWN"; |
11a5a3c7 | 598 | static int initialised; |
06963d0f MP |
599 | struct addrinfo hints, *res, *res0; |
600 | int error; | |
11a5a3c7 AT |
601 | |
602 | if (initialised) return name_buf; | |
603 | ||
604 | initialised = 1; | |
ff8b29b8 | 605 | |
de5fb374 | 606 | strcpy(name_buf,def); |
ff8b29b8 | 607 | |
06963d0f | 608 | if (getpeername(fd, (struct sockaddr *)&ss, &length)) { |
d5d4b282 MP |
609 | /* FIXME: Can we really not continue? */ |
610 | rprintf(FERROR, RSYNC_NAME ": getpeername on fd%d failed: %s\n", | |
c11b8806 | 611 | fd, strerror(errno)); |
65417579 | 612 | exit_cleanup(RERR_SOCKETIO); |
ff8b29b8 AT |
613 | } |
614 | ||
06963d0f | 615 | #ifdef INET6 |
d91c8c50 | 616 | if (get_sockaddr_family(&ss) == AF_INET6 && |
06963d0f MP |
617 | IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6 *)&ss)->sin6_addr)) { |
618 | struct sockaddr_in6 sin6; | |
619 | struct sockaddr_in *sin; | |
620 | ||
621 | memcpy(&sin6, &ss, sizeof(sin6)); | |
622 | sin = (struct sockaddr_in *)&ss; | |
623 | memset(sin, 0, sizeof(*sin)); | |
624 | sin->sin_family = AF_INET; | |
625 | length = sizeof(struct sockaddr_in); | |
626 | #ifdef HAVE_SOCKADDR_LEN | |
627 | sin->sin_len = length; | |
628 | #endif | |
629 | sin->sin_port = sin6.sin6_port; | |
630 | memcpy(&sin->sin_addr, &sin6.sin6_addr.s6_addr[12], | |
631 | sizeof(sin->sin_addr)); | |
632 | } | |
633 | #endif | |
634 | ||
635 | /* reverse lookup */ | |
636 | if (getnameinfo((struct sockaddr *)&ss, length, | |
637 | name_buf, sizeof(name_buf), port_buf, sizeof(port_buf), | |
638 | NI_NAMEREQD | NI_NUMERICSERV) != 0) { | |
639 | strcpy(name_buf, def); | |
640 | rprintf(FERROR, "reverse name lookup failed\n"); | |
ff8b29b8 AT |
641 | } |
642 | ||
06963d0f MP |
643 | /* forward lookup */ |
644 | memset(&hints, 0, sizeof(hints)); | |
645 | hints.ai_family = PF_UNSPEC; | |
646 | hints.ai_flags = AI_CANONNAME; | |
647 | hints.ai_socktype = SOCK_STREAM; | |
648 | error = getaddrinfo(name_buf, port_buf, &hints, &res0); | |
649 | if (error) { | |
650 | strcpy(name_buf, def); | |
7ef6aa64 MP |
651 | rprintf(FERROR, |
652 | RSYNC_NAME ": forward name lookup for %s failed: %s\n", | |
653 | port_buf, | |
654 | gai_strerror(error)); | |
06963d0f MP |
655 | return name_buf; |
656 | } | |
de5fb374 | 657 | |
06963d0f MP |
658 | /* XXX sin6_flowinfo and other fields */ |
659 | for (res = res0; res; res = res->ai_next) { | |
d91c8c50 | 660 | if (res->ai_family != get_sockaddr_family(&ss)) |
06963d0f MP |
661 | continue; |
662 | if (res->ai_addrlen != length) | |
663 | continue; | |
664 | if (memcmp(res->ai_addr, &ss, res->ai_addrlen) == 0) | |
665 | break; | |
666 | } | |
667 | ||
61f543ca | 668 | /* TODO: Do a forward lookup as well to prevent spoofing */ |
06963d0f MP |
669 | |
670 | if (res == NULL) { | |
671 | strcpy(name_buf, def); | |
d5d4b282 MP |
672 | rprintf(FERROR, RSYNC_NAME ": " |
673 | "reverse name lookup mismatch on fd%d - spoofed address?\n", | |
674 | fd); | |
de5fb374 AT |
675 | } |
676 | ||
06963d0f | 677 | freeaddrinfo(res0); |
ff8b29b8 AT |
678 | return name_buf; |
679 | } | |
5c9730a4 | 680 | |
eecd22ff MP |
681 | |
682 | /******************************************************************* | |
683 | this is like socketpair but uses tcp. It is used by the Samba | |
684 | regression test code | |
685 | The function guarantees that nobody else can attach to the socket, | |
686 | or if they do that this function fails and the socket gets closed | |
687 | returns 0 on success, -1 on failure | |
688 | the resulting file descriptors are symmetrical | |
689 | ******************************************************************/ | |
690 | static int socketpair_tcp(int fd[2]) | |
691 | { | |
692 | int listener; | |
693 | struct sockaddr_in sock; | |
694 | struct sockaddr_in sock2; | |
695 | socklen_t socklen = sizeof(sock); | |
696 | int connect_done = 0; | |
697 | ||
698 | fd[0] = fd[1] = listener = -1; | |
699 | ||
700 | memset(&sock, 0, sizeof(sock)); | |
701 | ||
702 | if ((listener = socket(PF_INET, SOCK_STREAM, 0)) == -1) goto failed; | |
703 | ||
704 | memset(&sock2, 0, sizeof(sock2)); | |
705 | #ifdef HAVE_SOCK_SIN_LEN | |
706 | sock2.sin_len = sizeof(sock2); | |
707 | #endif | |
708 | sock2.sin_family = PF_INET; | |
709 | ||
710 | bind(listener, (struct sockaddr *)&sock2, sizeof(sock2)); | |
711 | ||
712 | if (listen(listener, 1) != 0) goto failed; | |
713 | ||
714 | if (getsockname(listener, (struct sockaddr *)&sock, &socklen) != 0) goto failed; | |
715 | ||
716 | if ((fd[1] = socket(PF_INET, SOCK_STREAM, 0)) == -1) goto failed; | |
717 | ||
718 | set_nonblocking(fd[1]); | |
719 | ||
720 | sock.sin_addr.s_addr = htonl(INADDR_LOOPBACK); | |
721 | ||
722 | if (connect(fd[1],(struct sockaddr *)&sock,sizeof(sock)) == -1) { | |
723 | if (errno != EINPROGRESS) goto failed; | |
724 | } else { | |
725 | connect_done = 1; | |
726 | } | |
727 | ||
728 | if ((fd[0] = accept(listener, (struct sockaddr *)&sock, &socklen)) == -1) goto failed; | |
729 | ||
730 | close(listener); | |
731 | if (connect_done == 0) { | |
732 | if (connect(fd[1],(struct sockaddr *)&sock,sizeof(sock)) != 0 | |
733 | && errno != EISCONN) goto failed; | |
734 | } | |
735 | ||
736 | set_blocking (fd[1]); | |
737 | ||
738 | /* all OK! */ | |
739 | return 0; | |
740 | ||
741 | failed: | |
742 | if (fd[0] != -1) close(fd[0]); | |
743 | if (fd[1] != -1) close(fd[1]); | |
744 | if (listener != -1) close(listener); | |
745 | return -1; | |
746 | } | |
747 | ||
748 | ||
749 | /******************************************************************* | |
750 | run a program on a local tcp socket, this is used to launch smbd | |
751 | when regression testing | |
752 | the return value is a socket which is attached to a subprocess | |
753 | running "prog". stdin and stdout are attached. stderr is left | |
754 | attached to the original stderr | |
755 | ******************************************************************/ | |
756 | int sock_exec(const char *prog) | |
757 | { | |
758 | int fd[2]; | |
759 | if (socketpair_tcp(fd) != 0) { | |
760 | rprintf (FERROR, RSYNC_NAME | |
761 | ": socketpair_tcp failed (%s)\n", | |
762 | strerror(errno)); | |
763 | return -1; | |
764 | } | |
765 | if (fork() == 0) { | |
766 | close(fd[0]); | |
767 | close(0); | |
768 | close(1); | |
769 | dup(fd[1]); | |
770 | dup(fd[1]); | |
771 | if (verbose > 3) | |
772 | fprintf (stderr, | |
773 | RSYNC_NAME ": execute socket program \"%s\"\n", | |
774 | prog); | |
775 | exit (system (prog)); | |
776 | } | |
777 | close (fd[1]); | |
778 | return fd[0]; | |
779 | } | |
780 | ||
781 | ||
782 |