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 | ||
d5d4b282 | 33 | // extern int af; /* NO MORE BLOODY GLOBALS! */ |
4c3b4b25 | 34 | |
660c6fbd MP |
35 | /* Establish a proxy connection on an open socket to a web roxy by |
36 | * using the CONNECT method. */ | |
4c3b4b25 AT |
37 | static int establish_proxy_connection(int fd, char *host, int port) |
38 | { | |
39 | char buffer[1024]; | |
40 | char *cp; | |
41 | ||
8950ac03 | 42 | snprintf(buffer, sizeof(buffer), "CONNECT %s:%d HTTP/1.0\r\n\r\n", host, port); |
4c3b4b25 | 43 | if (write(fd, buffer, strlen(buffer)) != strlen(buffer)) { |
660c6fbd | 44 | rprintf(FERROR, "failed to write to proxy: %s\n", |
4c3b4b25 AT |
45 | strerror(errno)); |
46 | return -1; | |
47 | } | |
48 | ||
49 | for (cp = buffer; cp < &buffer[sizeof(buffer) - 1]; cp++) { | |
50 | if (read(fd, cp, 1) != 1) { | |
660c6fbd MP |
51 | rprintf(FERROR, "failed to read from proxy: %s\n", |
52 | strerror(errno)); | |
4c3b4b25 AT |
53 | return -1; |
54 | } | |
55 | if (*cp == '\n') | |
56 | break; | |
57 | } | |
58 | ||
59 | if (*cp != '\n') | |
60 | cp++; | |
61 | *cp-- = '\0'; | |
62 | if (*cp == '\r') | |
63 | *cp = '\0'; | |
64 | if (strncmp(buffer, "HTTP/", 5) != 0) { | |
65 | rprintf(FERROR, "bad response from proxy - %s\n", | |
66 | buffer); | |
67 | return -1; | |
68 | } | |
69 | for (cp = &buffer[5]; isdigit(*cp) || (*cp == '.'); cp++) | |
70 | ; | |
71 | while (*cp == ' ') | |
72 | cp++; | |
73 | if (*cp != '2') { | |
74 | rprintf(FERROR, "bad response from proxy - %s\n", | |
75 | buffer); | |
76 | return -1; | |
77 | } | |
78 | /* throw away the rest of the HTTP header */ | |
79 | while (1) { | |
80 | for (cp = buffer; cp < &buffer[sizeof(buffer) - 1]; | |
81 | cp++) { | |
82 | if (read(fd, cp, 1) != 1) { | |
660c6fbd MP |
83 | rprintf(FERROR, "failed to read from proxy: %s\n", |
84 | strerror(errno)); | |
4c3b4b25 AT |
85 | return -1; |
86 | } | |
87 | if (*cp == '\n') | |
88 | break; | |
89 | } | |
90 | if ((cp > buffer) && (*cp == '\n')) | |
91 | cp--; | |
92 | if ((cp == buffer) && ((*cp == '\n') || (*cp == '\r'))) | |
93 | break; | |
94 | } | |
95 | return 0; | |
96 | } | |
97 | ||
98 | ||
eecd22ff | 99 | |
d5d4b282 MP |
100 | /** |
101 | * Open a socket to a tcp remote host with the specified port . | |
06963d0f | 102 | * |
d5d4b282 MP |
103 | * Based on code from Warren. Proxy support by Stephen Rothwell. |
104 | * getaddrinfo() rewrite contributed by KAME.net. | |
06963d0f | 105 | * |
d5d4b282 MP |
106 | * Now that we support IPv6 we need to look up the remote machine's |
107 | * address first, using @p af_hint to set a preference for the type | |
108 | * of address. Then depending on whether it has v4 or v6 addresses we | |
109 | * try to open a connection. | |
06963d0f | 110 | * |
d5d4b282 MP |
111 | * The loop allows for machines with some addresses which may not be |
112 | * reachable, perhaps because we can't e.g. route ipv6 to that network | |
113 | * but we can get ip4 packets through. | |
114 | * | |
115 | * @param bind_address Local address to use. Normally NULL to bind | |
116 | * the wildcard address. | |
117 | * | |
118 | * @param af_hint Address family, e.g. AF_INET or AF_INET6. | |
06963d0f | 119 | **/ |
d5d4b282 MP |
120 | int open_socket_out(char *host, int port, const char *bind_address, |
121 | int af_hint) | |
bc2e93eb | 122 | { |
f0fca04e | 123 | int type = SOCK_STREAM; |
06963d0f MP |
124 | int error; |
125 | int s; | |
126 | int result; | |
127 | struct addrinfo hints, *res0, *res; | |
128 | char portbuf[10]; | |
4c3b4b25 | 129 | char *h; |
4c3b4b25 AT |
130 | int proxied = 0; |
131 | char buffer[1024]; | |
132 | char *cp; | |
133 | ||
660c6fbd MP |
134 | /* if we have a RSYNC_PROXY env variable then redirect our |
135 | * connetcion via a web proxy at the given address. The format | |
136 | * is hostname:port */ | |
4c3b4b25 AT |
137 | h = getenv("RSYNC_PROXY"); |
138 | proxied = (h != NULL) && (*h != '\0'); | |
139 | ||
140 | if (proxied) { | |
141 | strlcpy(buffer, h, sizeof(buffer)); | |
142 | cp = strchr(buffer, ':'); | |
143 | if (cp == NULL) { | |
660c6fbd MP |
144 | rprintf(FERROR, |
145 | "invalid proxy specification: should be HOST:PORT\n"); | |
4c3b4b25 AT |
146 | return -1; |
147 | } | |
148 | *cp++ = '\0'; | |
06963d0f | 149 | strcpy(portbuf, cp); |
4c3b4b25 AT |
150 | h = buffer; |
151 | } else { | |
06963d0f | 152 | snprintf(portbuf, sizeof(portbuf), "%d", port); |
4c3b4b25 | 153 | h = host; |
4c3b4b25 | 154 | } |
f0fca04e | 155 | |
06963d0f | 156 | memset(&hints, 0, sizeof(hints)); |
d5d4b282 | 157 | hints.ai_family = af_hint; |
06963d0f MP |
158 | hints.ai_socktype = type; |
159 | error = getaddrinfo(h, portbuf, &hints, &res0); | |
160 | if (error) { | |
d5d4b282 MP |
161 | rprintf(FERROR, RSYNC_NAME ": getaddrinfo: %s %s: %s\n", |
162 | h, portbuf, gai_strerror(error)); | |
f0fca04e AT |
163 | return -1; |
164 | } | |
165 | ||
06963d0f MP |
166 | s = -1; |
167 | for (res = res0; res; res = res->ai_next) { | |
168 | s = socket(res->ai_family, res->ai_socktype, res->ai_protocol); | |
169 | if (s < 0) | |
170 | continue; | |
f0fca04e | 171 | |
06963d0f MP |
172 | if (bind_address) { |
173 | struct addrinfo bhints, *bres; | |
174 | ||
175 | memset(&bhints, 0, sizeof(bhints)); | |
176 | bhints.ai_family = res->ai_family; | |
177 | bhints.ai_socktype = type; | |
178 | bhints.ai_flags = AI_PASSIVE; | |
179 | error = getaddrinfo(bind_address, NULL, &bhints, &bres); | |
180 | if (error) { | |
d5d4b282 | 181 | rprintf(FERROR, RSYNC_NAME ": getaddrinfo: bind address %s <noport>: %s\n", |
7ef6aa64 | 182 | bind_address, gai_strerror(error)); |
06963d0f MP |
183 | continue; |
184 | } | |
185 | if (bres->ai_next) { | |
7ef6aa64 MP |
186 | rprintf(FERROR, RSYNC_NAME ": getaddrinfo: bind address %s resolved to multiple hosts\n", |
187 | bind_address); | |
06963d0f MP |
188 | freeaddrinfo(bres); |
189 | continue; | |
190 | } | |
191 | bind(s, bres->ai_addr, bres->ai_addrlen); | |
192 | } | |
e30f0657 | 193 | |
06963d0f MP |
194 | if (connect(s, res->ai_addr, res->ai_addrlen) < 0) { |
195 | close(s); | |
196 | s = -1; | |
197 | continue; | |
198 | } | |
199 | if (proxied && | |
200 | establish_proxy_connection(s, host, port) != 0) { | |
201 | close(s); | |
202 | s = -1; | |
203 | continue; | |
204 | } else | |
205 | break; | |
4c3b4b25 | 206 | } |
06963d0f MP |
207 | freeaddrinfo(res0); |
208 | if (s < 0) { | |
7ef6aa64 MP |
209 | rprintf(FERROR, RSYNC_NAME ": failed to connect to %s: %s\n", |
210 | h, strerror(errno)); | |
f0fca04e AT |
211 | return -1; |
212 | } | |
06963d0f | 213 | return s; |
f0fca04e AT |
214 | } |
215 | ||
216 | ||
eecd22ff MP |
217 | /** |
218 | * Open an outgoing socket, but allow for it to be intercepted by | |
219 | * $RSYNC_CONNECT_PROG, which will execute a program across a TCP | |
220 | * socketpair rather than really opening a socket. | |
221 | * | |
222 | * We use this primarily in testing to detect TCP flow bugs, but not | |
223 | * cause security problems by really opening remote connections. | |
224 | * | |
225 | * This is based on the Samba LIBSMB_PROG feature. | |
06963d0f MP |
226 | * |
227 | * @param bind_address Local address to use. Normally NULL to get the stack default. | |
eecd22ff MP |
228 | **/ |
229 | int open_socket_out_wrapped (char *host, | |
230 | int port, | |
d5d4b282 MP |
231 | const char *bind_address, |
232 | int af_hint) | |
eecd22ff MP |
233 | { |
234 | char *prog; | |
235 | ||
236 | if ((prog = getenv ("RSYNC_CONNECT_PROG")) != NULL) | |
237 | return sock_exec (prog); | |
238 | else | |
d5d4b282 MP |
239 | return open_socket_out (host, port, bind_address, |
240 | af_hint); | |
eecd22ff MP |
241 | } |
242 | ||
243 | ||
244 | ||
06963d0f MP |
245 | /** |
246 | * Open a socket of the specified type, port and address for incoming data | |
247 | * | |
b8771f96 MP |
248 | * Try to be better about handling the results of getaddrinfo(): when |
249 | * opening an inbound socket, we might get several address results, | |
250 | * e.g. for the machine's ipv4 and ipv6 name. | |
251 | * | |
252 | * If binding a wildcard, then any one of them should do. If an address | |
253 | * was specified but it's insufficiently specific then that's not our | |
254 | * fault. | |
255 | * | |
256 | * However, some of the advertized addresses may not work because e.g. we | |
257 | * don't have IPv6 support in the kernel. In that case go on and try all | |
258 | * addresses until one succeeds. | |
259 | * | |
06963d0f MP |
260 | * @param bind_address Local address to bind, or NULL to allow it to |
261 | * default. | |
262 | **/ | |
d5d4b282 MP |
263 | static int open_socket_in(int type, int port, const char *bind_address, |
264 | int af_hint) | |
f0fca04e | 265 | { |
f0fca04e | 266 | int one=1; |
06963d0f | 267 | int s; |
b8771f96 | 268 | struct addrinfo hints, *res, *resp; |
06963d0f MP |
269 | char portbuf[10]; |
270 | int error; | |
271 | ||
272 | memset(&hints, 0, sizeof(hints)); | |
d5d4b282 | 273 | hints.ai_family = af_hint; |
06963d0f MP |
274 | hints.ai_socktype = type; |
275 | hints.ai_flags = AI_PASSIVE; | |
276 | snprintf(portbuf, sizeof(portbuf), "%d", port); | |
277 | error = getaddrinfo(bind_address, portbuf, &hints, &res); | |
278 | if (error) { | |
7ef6aa64 MP |
279 | rprintf(FERROR, RSYNC_NAME ": getaddrinfo: bind address %s: %s\n", |
280 | bind_address, gai_strerror(error)); | |
06963d0f MP |
281 | return -1; |
282 | } | |
b8771f96 MP |
283 | /* XXX: Do we need to care about getting multiple results |
284 | * back? I think probably not; if the user passed | |
285 | * bind_address == NULL and we set AI_PASSIVE then we ought to | |
286 | * get a wildcard result. */ | |
06963d0f | 287 | |
b8771f96 MP |
288 | resp = res; |
289 | while (1) { | |
290 | s = socket(resp->ai_family, resp->ai_socktype, resp->ai_protocol); | |
291 | ||
292 | if (s >= 0) { | |
293 | break; /* got a socket */ | |
294 | } else if ((resp = resp->ai_next)) { | |
295 | switch (errno) { | |
296 | case EPROTONOSUPPORT: | |
297 | case EAFNOSUPPORT: | |
298 | case EPFNOSUPPORT: | |
299 | /* See if there's another address that will work... */ | |
300 | continue; | |
301 | } | |
302 | } | |
303 | ||
304 | rprintf(FERROR, RSYNC_NAME ": open inbound socket" | |
305 | "(dom=%d, type=%d, proto=%d) failed: %s\n", | |
306 | resp->ai_family, resp->ai_socktype, resp->ai_protocol, | |
307 | strerror(errno)); | |
308 | goto fail; | |
f0fca04e AT |
309 | } |
310 | ||
06963d0f | 311 | setsockopt(s,SOL_SOCKET,SO_REUSEADDR,(char *)&one,sizeof(one)); |
f0fca04e AT |
312 | |
313 | /* now we've got a socket - we need to bind it */ | |
06963d0f MP |
314 | if (bind(s, res->ai_addr, res->ai_addrlen) < 0) { |
315 | rprintf(FERROR, RSYNC_NAME ": bind failed on port %d\n", port); | |
b8771f96 MP |
316 | close(s); |
317 | goto fail; | |
f0fca04e AT |
318 | } |
319 | ||
06963d0f | 320 | return s; |
b8771f96 MP |
321 | |
322 | fail: | |
323 | freeaddrinfo(res); | |
324 | return -1; | |
f0fca04e AT |
325 | } |
326 | ||
327 | ||
7c1b4daa MP |
328 | /* |
329 | * Determine if a file descriptor is in fact a socket | |
330 | */ | |
f0fca04e AT |
331 | int is_a_socket(int fd) |
332 | { | |
ac2a1a44 MP |
333 | int v; |
334 | socklen_t l; | |
3eb38818 | 335 | l = sizeof(int); |
7c1b4daa MP |
336 | |
337 | /* Parameters to getsockopt, setsockopt etc are very | |
338 | * unstandardized across platforms, so don't be surprised if | |
ac2a1a44 MP |
339 | * there are compiler warnings on e.g. SCO OpenSwerver or AIX. |
340 | * It seems they all eventually get the right idea. | |
7c1b4daa MP |
341 | * |
342 | * Debian says: ``The fifth argument of getsockopt and | |
343 | * setsockopt is in reality an int [*] (and this is what BSD | |
344 | * 4.* and libc4 and libc5 have). Some POSIX confusion | |
345 | * resulted in the present socklen_t. The draft standard has | |
346 | * not been adopted yet, but glibc2 already follows it and | |
347 | * also has socklen_t [*]. See also accept(2).'' | |
348 | * | |
349 | * We now return to your regularly scheduled programming. */ | |
3eb38818 | 350 | return(getsockopt(fd, SOL_SOCKET, SO_TYPE, (char *)&v, &l) == 0); |
f0fca04e AT |
351 | } |
352 | ||
353 | ||
8ef4ffd6 | 354 | void start_accept_loop(int port, int (*fn)(int )) |
f0fca04e AT |
355 | { |
356 | int s; | |
06963d0f | 357 | extern char *bind_address; |
f0fca04e | 358 | |
f0fca04e | 359 | /* open an incoming socket */ |
d5d4b282 MP |
360 | s = open_socket_in(SOCK_STREAM, port, bind_address, |
361 | global_opts.af_hint); | |
f0fca04e | 362 | if (s == -1) |
65417579 | 363 | exit_cleanup(RERR_SOCKETIO); |
f0fca04e AT |
364 | |
365 | /* ready to listen */ | |
366 | if (listen(s, 5) == -1) { | |
367 | close(s); | |
65417579 | 368 | exit_cleanup(RERR_SOCKETIO); |
f0fca04e AT |
369 | } |
370 | ||
371 | ||
372 | /* now accept incoming connections - forking a new process | |
373 | for each incoming connection */ | |
374 | while (1) { | |
375 | fd_set fds; | |
376 | int fd; | |
1f0fa931 | 377 | struct sockaddr addr; |
06963d0f | 378 | int in_addrlen = sizeof(addr); |
f0fca04e | 379 | |
15b84e14 DD |
380 | /* close log file before the potentially very long select so |
381 | file can be trimmed by another process instead of growing | |
382 | forever */ | |
383 | log_close(); | |
45a83540 | 384 | |
f0fca04e AT |
385 | FD_ZERO(&fds); |
386 | FD_SET(s, &fds); | |
387 | ||
388 | if (select(s+1, &fds, NULL, NULL, NULL) != 1) { | |
389 | continue; | |
390 | } | |
391 | ||
392 | if(!FD_ISSET(s, &fds)) continue; | |
393 | ||
06963d0f | 394 | fd = accept(s,(struct sockaddr *)&addr,&in_addrlen); |
f0fca04e AT |
395 | |
396 | if (fd == -1) continue; | |
397 | ||
31f440e6 AT |
398 | signal(SIGCHLD, SIG_IGN); |
399 | ||
400 | /* we shouldn't have any children left hanging around | |
401 | but I have had reports that on Digital Unix zombies | |
402 | are produced, so this ensures that they are reaped */ | |
403 | #ifdef WNOHANG | |
0503f060 | 404 | while (waitpid(-1, NULL, WNOHANG) > 0); |
31f440e6 AT |
405 | #endif |
406 | ||
f0fca04e AT |
407 | if (fork()==0) { |
408 | close(s); | |
15b84e14 DD |
409 | /* open log file in child before possibly giving |
410 | up privileges */ | |
411 | log_open(); | |
f0fca04e AT |
412 | _exit(fn(fd)); |
413 | } | |
414 | ||
415 | close(fd); | |
416 | } | |
f0fca04e AT |
417 | } |
418 | ||
419 | ||
420 | enum SOCK_OPT_TYPES {OPT_BOOL,OPT_INT,OPT_ON}; | |
421 | ||
422 | struct | |
423 | { | |
424 | char *name; | |
425 | int level; | |
426 | int option; | |
427 | int value; | |
428 | int opttype; | |
429 | } socket_options[] = { | |
430 | {"SO_KEEPALIVE", SOL_SOCKET, SO_KEEPALIVE, 0, OPT_BOOL}, | |
431 | {"SO_REUSEADDR", SOL_SOCKET, SO_REUSEADDR, 0, OPT_BOOL}, | |
432 | {"SO_BROADCAST", SOL_SOCKET, SO_BROADCAST, 0, OPT_BOOL}, | |
433 | #ifdef TCP_NODELAY | |
434 | {"TCP_NODELAY", IPPROTO_TCP, TCP_NODELAY, 0, OPT_BOOL}, | |
435 | #endif | |
436 | #ifdef IPTOS_LOWDELAY | |
437 | {"IPTOS_LOWDELAY", IPPROTO_IP, IP_TOS, IPTOS_LOWDELAY, OPT_ON}, | |
438 | #endif | |
439 | #ifdef IPTOS_THROUGHPUT | |
440 | {"IPTOS_THROUGHPUT", IPPROTO_IP, IP_TOS, IPTOS_THROUGHPUT, OPT_ON}, | |
441 | #endif | |
442 | #ifdef SO_SNDBUF | |
443 | {"SO_SNDBUF", SOL_SOCKET, SO_SNDBUF, 0, OPT_INT}, | |
444 | #endif | |
445 | #ifdef SO_RCVBUF | |
446 | {"SO_RCVBUF", SOL_SOCKET, SO_RCVBUF, 0, OPT_INT}, | |
447 | #endif | |
448 | #ifdef SO_SNDLOWAT | |
449 | {"SO_SNDLOWAT", SOL_SOCKET, SO_SNDLOWAT, 0, OPT_INT}, | |
450 | #endif | |
451 | #ifdef SO_RCVLOWAT | |
452 | {"SO_RCVLOWAT", SOL_SOCKET, SO_RCVLOWAT, 0, OPT_INT}, | |
453 | #endif | |
454 | #ifdef SO_SNDTIMEO | |
455 | {"SO_SNDTIMEO", SOL_SOCKET, SO_SNDTIMEO, 0, OPT_INT}, | |
456 | #endif | |
457 | #ifdef SO_RCVTIMEO | |
458 | {"SO_RCVTIMEO", SOL_SOCKET, SO_RCVTIMEO, 0, OPT_INT}, | |
459 | #endif | |
460 | {NULL,0,0,0,0}}; | |
461 | ||
462 | ||
463 | ||
464 | /**************************************************************************** | |
465 | set user socket options | |
466 | ****************************************************************************/ | |
467 | void set_socket_options(int fd, char *options) | |
468 | { | |
469 | char *tok; | |
a6801c39 AT |
470 | if (!options || !*options) return; |
471 | ||
f0fca04e AT |
472 | options = strdup(options); |
473 | ||
474 | if (!options) out_of_memory("set_socket_options"); | |
475 | ||
476 | for (tok=strtok(options, " \t,"); tok; tok=strtok(NULL," \t,")) { | |
477 | int ret=0,i; | |
478 | int value = 1; | |
479 | char *p; | |
480 | int got_value = 0; | |
481 | ||
482 | if ((p = strchr(tok,'='))) { | |
483 | *p = 0; | |
484 | value = atoi(p+1); | |
485 | got_value = 1; | |
486 | } | |
487 | ||
488 | for (i=0;socket_options[i].name;i++) | |
489 | if (strcmp(socket_options[i].name,tok)==0) | |
490 | break; | |
491 | ||
492 | if (!socket_options[i].name) { | |
493 | rprintf(FERROR,"Unknown socket option %s\n",tok); | |
494 | continue; | |
495 | } | |
496 | ||
497 | switch (socket_options[i].opttype) { | |
498 | case OPT_BOOL: | |
499 | case OPT_INT: | |
500 | ret = setsockopt(fd,socket_options[i].level, | |
501 | socket_options[i].option,(char *)&value,sizeof(int)); | |
502 | break; | |
503 | ||
504 | case OPT_ON: | |
505 | if (got_value) | |
506 | rprintf(FERROR,"syntax error - %s does not take a value\n",tok); | |
507 | ||
508 | { | |
509 | int on = socket_options[i].value; | |
510 | ret = setsockopt(fd,socket_options[i].level, | |
511 | socket_options[i].option,(char *)&on,sizeof(int)); | |
512 | } | |
513 | break; | |
514 | } | |
515 | ||
516 | if (ret != 0) | |
660c6fbd MP |
517 | rprintf(FERROR, "failed to set socket option %s: %s\n", tok, |
518 | strerror(errno)); | |
f0fca04e AT |
519 | } |
520 | ||
521 | free(options); | |
522 | } | |
523 | ||
524 | /**************************************************************************** | |
525 | become a daemon, discarding the controlling terminal | |
526 | ****************************************************************************/ | |
527 | void become_daemon(void) | |
528 | { | |
b11ed3b1 AT |
529 | int i; |
530 | ||
c46ded46 | 531 | if (fork()) { |
f0fca04e | 532 | _exit(0); |
c46ded46 | 533 | } |
f0fca04e AT |
534 | |
535 | /* detach from the terminal */ | |
536 | #ifdef HAVE_SETSID | |
537 | setsid(); | |
538 | #else | |
539 | #ifdef TIOCNOTTY | |
c46ded46 AT |
540 | i = open("/dev/tty", O_RDWR); |
541 | if (i >= 0) { | |
542 | ioctl(i, (int) TIOCNOTTY, (char *)0); | |
543 | close(i); | |
f0fca04e AT |
544 | } |
545 | #endif /* TIOCNOTTY */ | |
546 | #endif | |
b11ed3b1 AT |
547 | /* make sure that stdin, stdout an stderr don't stuff things |
548 | up (library functions, for example) */ | |
549 | for (i=0;i<3;i++) { | |
550 | close(i); | |
551 | open("/dev/null", O_RDWR); | |
552 | } | |
bc2e93eb | 553 | } |
ff8b29b8 | 554 | |
1f0fa931 MP |
555 | /** |
556 | * Return the IP addr of the client as a string | |
557 | **/ | |
ff8b29b8 AT |
558 | char *client_addr(int fd) |
559 | { | |
1f0fa931 | 560 | struct sockaddr ss; |
06963d0f | 561 | int length = sizeof(ss); |
ff8b29b8 | 562 | static char addr_buf[100]; |
11a5a3c7 AT |
563 | static int initialised; |
564 | ||
565 | if (initialised) return addr_buf; | |
566 | ||
567 | initialised = 1; | |
ff8b29b8 | 568 | |
1f0fa931 | 569 | if (getpeername(fd, &ss, &length)) { |
65417579 | 570 | exit_cleanup(RERR_SOCKETIO); |
ff8b29b8 | 571 | } |
06963d0f | 572 | |
1f0fa931 | 573 | getnameinfo(&ss, length, |
06963d0f | 574 | addr_buf, sizeof(addr_buf), NULL, 0, NI_NUMERICHOST); |
ff8b29b8 AT |
575 | return addr_buf; |
576 | } | |
577 | ||
578 | ||
1f0fa931 MP |
579 | /** |
580 | * Return the DNS name of the client | |
581 | **/ | |
ff8b29b8 AT |
582 | char *client_name(int fd) |
583 | { | |
1f0fa931 | 584 | struct sockaddr ss; |
06963d0f | 585 | int length = sizeof(ss); |
ff8b29b8 | 586 | static char name_buf[100]; |
06963d0f | 587 | static char port_buf[100]; |
de5fb374 | 588 | char *def = "UNKNOWN"; |
11a5a3c7 | 589 | static int initialised; |
06963d0f MP |
590 | struct addrinfo hints, *res, *res0; |
591 | int error; | |
11a5a3c7 AT |
592 | |
593 | if (initialised) return name_buf; | |
594 | ||
595 | initialised = 1; | |
ff8b29b8 | 596 | |
de5fb374 | 597 | strcpy(name_buf,def); |
ff8b29b8 | 598 | |
06963d0f | 599 | if (getpeername(fd, (struct sockaddr *)&ss, &length)) { |
d5d4b282 MP |
600 | /* FIXME: Can we really not continue? */ |
601 | rprintf(FERROR, RSYNC_NAME ": getpeername on fd%d failed: %s\n", | |
602 | strerror(errno)); | |
65417579 | 603 | exit_cleanup(RERR_SOCKETIO); |
ff8b29b8 AT |
604 | } |
605 | ||
06963d0f MP |
606 | #ifdef INET6 |
607 | if (ss.ss_family == AF_INET6 && | |
608 | IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6 *)&ss)->sin6_addr)) { | |
609 | struct sockaddr_in6 sin6; | |
610 | struct sockaddr_in *sin; | |
611 | ||
612 | memcpy(&sin6, &ss, sizeof(sin6)); | |
613 | sin = (struct sockaddr_in *)&ss; | |
614 | memset(sin, 0, sizeof(*sin)); | |
615 | sin->sin_family = AF_INET; | |
616 | length = sizeof(struct sockaddr_in); | |
617 | #ifdef HAVE_SOCKADDR_LEN | |
618 | sin->sin_len = length; | |
619 | #endif | |
620 | sin->sin_port = sin6.sin6_port; | |
621 | memcpy(&sin->sin_addr, &sin6.sin6_addr.s6_addr[12], | |
622 | sizeof(sin->sin_addr)); | |
623 | } | |
624 | #endif | |
625 | ||
626 | /* reverse lookup */ | |
627 | if (getnameinfo((struct sockaddr *)&ss, length, | |
628 | name_buf, sizeof(name_buf), port_buf, sizeof(port_buf), | |
629 | NI_NAMEREQD | NI_NUMERICSERV) != 0) { | |
630 | strcpy(name_buf, def); | |
631 | rprintf(FERROR, "reverse name lookup failed\n"); | |
ff8b29b8 AT |
632 | } |
633 | ||
06963d0f MP |
634 | /* forward lookup */ |
635 | memset(&hints, 0, sizeof(hints)); | |
636 | hints.ai_family = PF_UNSPEC; | |
637 | hints.ai_flags = AI_CANONNAME; | |
638 | hints.ai_socktype = SOCK_STREAM; | |
639 | error = getaddrinfo(name_buf, port_buf, &hints, &res0); | |
640 | if (error) { | |
641 | strcpy(name_buf, def); | |
7ef6aa64 MP |
642 | rprintf(FERROR, |
643 | RSYNC_NAME ": forward name lookup for %s failed: %s\n", | |
644 | port_buf, | |
645 | gai_strerror(error)); | |
06963d0f MP |
646 | return name_buf; |
647 | } | |
de5fb374 | 648 | |
06963d0f MP |
649 | /* XXX sin6_flowinfo and other fields */ |
650 | for (res = res0; res; res = res->ai_next) { | |
1f0fa931 | 651 | if (res->ai_family != ss.sa_family) |
06963d0f MP |
652 | continue; |
653 | if (res->ai_addrlen != length) | |
654 | continue; | |
655 | if (memcmp(res->ai_addr, &ss, res->ai_addrlen) == 0) | |
656 | break; | |
657 | } | |
658 | ||
659 | /* TODO: Do a forward lookup as well to prevent spoofing */ | |
660 | ||
661 | if (res == NULL) { | |
662 | strcpy(name_buf, def); | |
d5d4b282 MP |
663 | rprintf(FERROR, RSYNC_NAME ": " |
664 | "reverse name lookup mismatch on fd%d - spoofed address?\n", | |
665 | fd); | |
de5fb374 AT |
666 | } |
667 | ||
06963d0f | 668 | freeaddrinfo(res0); |
ff8b29b8 AT |
669 | return name_buf; |
670 | } | |
5c9730a4 | 671 | |
d58911fb | 672 | /** |
1f0fa931 MP |
673 | * Convert a string to an IP address. The string can be a name or |
674 | * dotted decimal number. | |
675 | * | |
676 | * Returns a pointer to a static in_addr struct -- if you call this | |
677 | * more than once then you should copy it. | |
678 | * | |
679 | * TODO: Use getaddrinfo() instead, or make this function call getnameinfo | |
680 | **/ | |
5c9730a4 AT |
681 | struct in_addr *ip_address(const char *str) |
682 | { | |
683 | static struct in_addr ret; | |
684 | struct hostent *hp; | |
685 | ||
f8014b86 MP |
686 | if (!str) { |
687 | rprintf (FERROR, "ip_address received NULL name\n"); | |
688 | return NULL; | |
689 | } | |
d58911fb | 690 | |
5c9730a4 AT |
691 | /* try as an IP address */ |
692 | if (inet_aton(str, &ret) != 0) { | |
693 | return &ret; | |
694 | } | |
695 | ||
696 | /* otherwise assume it's a network name of some sort and use | |
697 | gethostbyname */ | |
7d91d5a6 | 698 | if ((hp = gethostbyname (str)) == 0) { |
d58911fb | 699 | rprintf(FERROR, "gethostbyname failed for \"%s\": unknown host?\n",str); |
5c9730a4 AT |
700 | return NULL; |
701 | } | |
702 | ||
703 | if (hp->h_addr == NULL) { | |
d58911fb | 704 | rprintf(FERROR, "gethostbyname: host address is invalid for host \"%s\"\n",str); |
5c9730a4 AT |
705 | return NULL; |
706 | } | |
707 | ||
7d91d5a6 | 708 | if (hp->h_length > sizeof ret) { |
d58911fb MP |
709 | rprintf(FERROR, "gethostbyname: host address for \"%s\" is too large\n", |
710 | str); | |
5c9730a4 AT |
711 | return NULL; |
712 | } | |
713 | ||
7d91d5a6 MP |
714 | if (hp->h_addrtype != AF_INET) { |
715 | rprintf (FERROR, "gethostname: host address for \"%s\" is not IPv4\n", | |
716 | str); | |
717 | return NULL; | |
718 | } | |
719 | ||
720 | /* This is kind of difficult. The only field in ret is | |
721 | s_addr, which is the IP address as a 32-bit int. On | |
722 | UNICOS, s_addr is in fact a *bitfield* for reasons best | |
723 | know to Cray. This means we can't memcpy in to it. On the | |
724 | other hand, h_addr is a char*, so we can't just assign. | |
725 | ||
726 | Since there's meant to be only one field inside the in_addr | |
727 | structure we will try just copying over the top and see how | |
728 | that goes. */ | |
729 | memcpy (&ret, hp->h_addr, hp->h_length); | |
5c9730a4 | 730 | |
7d91d5a6 | 731 | return &ret; |
5c9730a4 | 732 | } |
eecd22ff MP |
733 | |
734 | ||
735 | ||
736 | /******************************************************************* | |
737 | this is like socketpair but uses tcp. It is used by the Samba | |
738 | regression test code | |
739 | The function guarantees that nobody else can attach to the socket, | |
740 | or if they do that this function fails and the socket gets closed | |
741 | returns 0 on success, -1 on failure | |
742 | the resulting file descriptors are symmetrical | |
743 | ******************************************************************/ | |
744 | static int socketpair_tcp(int fd[2]) | |
745 | { | |
746 | int listener; | |
747 | struct sockaddr_in sock; | |
748 | struct sockaddr_in sock2; | |
749 | socklen_t socklen = sizeof(sock); | |
750 | int connect_done = 0; | |
751 | ||
752 | fd[0] = fd[1] = listener = -1; | |
753 | ||
754 | memset(&sock, 0, sizeof(sock)); | |
755 | ||
756 | if ((listener = socket(PF_INET, SOCK_STREAM, 0)) == -1) goto failed; | |
757 | ||
758 | memset(&sock2, 0, sizeof(sock2)); | |
759 | #ifdef HAVE_SOCK_SIN_LEN | |
760 | sock2.sin_len = sizeof(sock2); | |
761 | #endif | |
762 | sock2.sin_family = PF_INET; | |
763 | ||
764 | bind(listener, (struct sockaddr *)&sock2, sizeof(sock2)); | |
765 | ||
766 | if (listen(listener, 1) != 0) goto failed; | |
767 | ||
768 | if (getsockname(listener, (struct sockaddr *)&sock, &socklen) != 0) goto failed; | |
769 | ||
770 | if ((fd[1] = socket(PF_INET, SOCK_STREAM, 0)) == -1) goto failed; | |
771 | ||
772 | set_nonblocking(fd[1]); | |
773 | ||
774 | sock.sin_addr.s_addr = htonl(INADDR_LOOPBACK); | |
775 | ||
776 | if (connect(fd[1],(struct sockaddr *)&sock,sizeof(sock)) == -1) { | |
777 | if (errno != EINPROGRESS) goto failed; | |
778 | } else { | |
779 | connect_done = 1; | |
780 | } | |
781 | ||
782 | if ((fd[0] = accept(listener, (struct sockaddr *)&sock, &socklen)) == -1) goto failed; | |
783 | ||
784 | close(listener); | |
785 | if (connect_done == 0) { | |
786 | if (connect(fd[1],(struct sockaddr *)&sock,sizeof(sock)) != 0 | |
787 | && errno != EISCONN) goto failed; | |
788 | } | |
789 | ||
790 | set_blocking (fd[1]); | |
791 | ||
792 | /* all OK! */ | |
793 | return 0; | |
794 | ||
795 | failed: | |
796 | if (fd[0] != -1) close(fd[0]); | |
797 | if (fd[1] != -1) close(fd[1]); | |
798 | if (listener != -1) close(listener); | |
799 | return -1; | |
800 | } | |
801 | ||
802 | ||
803 | /******************************************************************* | |
804 | run a program on a local tcp socket, this is used to launch smbd | |
805 | when regression testing | |
806 | the return value is a socket which is attached to a subprocess | |
807 | running "prog". stdin and stdout are attached. stderr is left | |
808 | attached to the original stderr | |
809 | ******************************************************************/ | |
810 | int sock_exec(const char *prog) | |
811 | { | |
812 | int fd[2]; | |
813 | if (socketpair_tcp(fd) != 0) { | |
814 | rprintf (FERROR, RSYNC_NAME | |
815 | ": socketpair_tcp failed (%s)\n", | |
816 | strerror(errno)); | |
817 | return -1; | |
818 | } | |
819 | if (fork() == 0) { | |
820 | close(fd[0]); | |
821 | close(0); | |
822 | close(1); | |
823 | dup(fd[1]); | |
824 | dup(fd[1]); | |
825 | if (verbose > 3) | |
826 | fprintf (stderr, | |
827 | RSYNC_NAME ": execute socket program \"%s\"\n", | |
828 | prog); | |
829 | exit (system (prog)); | |
830 | } | |
831 | close (fd[1]); | |
832 | return fd[0]; | |
833 | } | |
834 | ||
835 | ||
836 |