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 MP |
164 | s = -1; |
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) { | |
d5d4b282 | 179 | rprintf(FERROR, RSYNC_NAME ": getaddrinfo: bind address %s <noport>: %s\n", |
7ef6aa64 | 180 | bind_address, gai_strerror(error)); |
06963d0f MP |
181 | continue; |
182 | } | |
183 | if (bres->ai_next) { | |
7ef6aa64 MP |
184 | rprintf(FERROR, RSYNC_NAME ": getaddrinfo: bind address %s resolved to multiple hosts\n", |
185 | bind_address); | |
06963d0f MP |
186 | freeaddrinfo(bres); |
187 | continue; | |
188 | } | |
189 | bind(s, bres->ai_addr, bres->ai_addrlen); | |
190 | } | |
e30f0657 | 191 | |
06963d0f MP |
192 | if (connect(s, res->ai_addr, res->ai_addrlen) < 0) { |
193 | close(s); | |
194 | s = -1; | |
195 | continue; | |
196 | } | |
197 | if (proxied && | |
198 | establish_proxy_connection(s, host, port) != 0) { | |
199 | close(s); | |
200 | s = -1; | |
201 | continue; | |
202 | } else | |
203 | break; | |
4c3b4b25 | 204 | } |
06963d0f MP |
205 | freeaddrinfo(res0); |
206 | if (s < 0) { | |
7ef6aa64 MP |
207 | rprintf(FERROR, RSYNC_NAME ": failed to connect to %s: %s\n", |
208 | h, strerror(errno)); | |
f0fca04e AT |
209 | return -1; |
210 | } | |
06963d0f | 211 | return s; |
f0fca04e AT |
212 | } |
213 | ||
214 | ||
eecd22ff MP |
215 | /** |
216 | * Open an outgoing socket, but allow for it to be intercepted by | |
217 | * $RSYNC_CONNECT_PROG, which will execute a program across a TCP | |
218 | * socketpair rather than really opening a socket. | |
219 | * | |
220 | * We use this primarily in testing to detect TCP flow bugs, but not | |
221 | * cause security problems by really opening remote connections. | |
222 | * | |
223 | * This is based on the Samba LIBSMB_PROG feature. | |
06963d0f MP |
224 | * |
225 | * @param bind_address Local address to use. Normally NULL to get the stack default. | |
eecd22ff MP |
226 | **/ |
227 | int open_socket_out_wrapped (char *host, | |
228 | int port, | |
d5d4b282 MP |
229 | const char *bind_address, |
230 | int af_hint) | |
eecd22ff MP |
231 | { |
232 | char *prog; | |
233 | ||
234 | if ((prog = getenv ("RSYNC_CONNECT_PROG")) != NULL) | |
235 | return sock_exec (prog); | |
236 | else | |
d5d4b282 MP |
237 | return open_socket_out (host, port, bind_address, |
238 | af_hint); | |
eecd22ff MP |
239 | } |
240 | ||
241 | ||
242 | ||
06963d0f MP |
243 | /** |
244 | * Open a socket of the specified type, port and address for incoming data | |
245 | * | |
b8771f96 MP |
246 | * Try to be better about handling the results of getaddrinfo(): when |
247 | * opening an inbound socket, we might get several address results, | |
248 | * e.g. for the machine's ipv4 and ipv6 name. | |
249 | * | |
250 | * If binding a wildcard, then any one of them should do. If an address | |
251 | * was specified but it's insufficiently specific then that's not our | |
252 | * fault. | |
253 | * | |
254 | * However, some of the advertized addresses may not work because e.g. we | |
255 | * don't have IPv6 support in the kernel. In that case go on and try all | |
256 | * addresses until one succeeds. | |
257 | * | |
06963d0f MP |
258 | * @param bind_address Local address to bind, or NULL to allow it to |
259 | * default. | |
260 | **/ | |
d5d4b282 MP |
261 | static int open_socket_in(int type, int port, const char *bind_address, |
262 | int af_hint) | |
f0fca04e | 263 | { |
f0fca04e | 264 | int one=1; |
06963d0f | 265 | int s; |
b8771f96 | 266 | struct addrinfo hints, *res, *resp; |
06963d0f MP |
267 | char portbuf[10]; |
268 | int error; | |
269 | ||
270 | memset(&hints, 0, sizeof(hints)); | |
d5d4b282 | 271 | hints.ai_family = af_hint; |
06963d0f MP |
272 | hints.ai_socktype = type; |
273 | hints.ai_flags = AI_PASSIVE; | |
274 | snprintf(portbuf, sizeof(portbuf), "%d", port); | |
275 | error = getaddrinfo(bind_address, portbuf, &hints, &res); | |
276 | if (error) { | |
7ef6aa64 MP |
277 | rprintf(FERROR, RSYNC_NAME ": getaddrinfo: bind address %s: %s\n", |
278 | bind_address, gai_strerror(error)); | |
06963d0f MP |
279 | return -1; |
280 | } | |
b8771f96 MP |
281 | /* XXX: Do we need to care about getting multiple results |
282 | * back? I think probably not; if the user passed | |
283 | * bind_address == NULL and we set AI_PASSIVE then we ought to | |
284 | * get a wildcard result. */ | |
06963d0f | 285 | |
b8771f96 MP |
286 | resp = res; |
287 | while (1) { | |
288 | s = socket(resp->ai_family, resp->ai_socktype, resp->ai_protocol); | |
289 | ||
290 | if (s >= 0) { | |
291 | break; /* got a socket */ | |
292 | } else if ((resp = resp->ai_next)) { | |
293 | switch (errno) { | |
294 | case EPROTONOSUPPORT: | |
295 | case EAFNOSUPPORT: | |
296 | case EPFNOSUPPORT: | |
297 | /* See if there's another address that will work... */ | |
298 | continue; | |
299 | } | |
300 | } | |
301 | ||
302 | rprintf(FERROR, RSYNC_NAME ": open inbound socket" | |
303 | "(dom=%d, type=%d, proto=%d) failed: %s\n", | |
304 | resp->ai_family, resp->ai_socktype, resp->ai_protocol, | |
305 | strerror(errno)); | |
306 | goto fail; | |
f0fca04e AT |
307 | } |
308 | ||
06963d0f | 309 | setsockopt(s,SOL_SOCKET,SO_REUSEADDR,(char *)&one,sizeof(one)); |
f0fca04e AT |
310 | |
311 | /* now we've got a socket - we need to bind it */ | |
06963d0f MP |
312 | if (bind(s, res->ai_addr, res->ai_addrlen) < 0) { |
313 | rprintf(FERROR, RSYNC_NAME ": bind failed on port %d\n", port); | |
b8771f96 MP |
314 | close(s); |
315 | goto fail; | |
f0fca04e AT |
316 | } |
317 | ||
06963d0f | 318 | return s; |
b8771f96 MP |
319 | |
320 | fail: | |
321 | freeaddrinfo(res); | |
322 | return -1; | |
f0fca04e AT |
323 | } |
324 | ||
325 | ||
7c1b4daa MP |
326 | /* |
327 | * Determine if a file descriptor is in fact a socket | |
328 | */ | |
f0fca04e AT |
329 | int is_a_socket(int fd) |
330 | { | |
ac2a1a44 MP |
331 | int v; |
332 | socklen_t l; | |
3eb38818 | 333 | l = sizeof(int); |
7c1b4daa MP |
334 | |
335 | /* Parameters to getsockopt, setsockopt etc are very | |
336 | * unstandardized across platforms, so don't be surprised if | |
ac2a1a44 MP |
337 | * there are compiler warnings on e.g. SCO OpenSwerver or AIX. |
338 | * It seems they all eventually get the right idea. | |
7c1b4daa MP |
339 | * |
340 | * Debian says: ``The fifth argument of getsockopt and | |
341 | * setsockopt is in reality an int [*] (and this is what BSD | |
342 | * 4.* and libc4 and libc5 have). Some POSIX confusion | |
343 | * resulted in the present socklen_t. The draft standard has | |
344 | * not been adopted yet, but glibc2 already follows it and | |
345 | * also has socklen_t [*]. See also accept(2).'' | |
346 | * | |
347 | * We now return to your regularly scheduled programming. */ | |
3eb38818 | 348 | return(getsockopt(fd, SOL_SOCKET, SO_TYPE, (char *)&v, &l) == 0); |
f0fca04e AT |
349 | } |
350 | ||
351 | ||
8ef4ffd6 | 352 | void start_accept_loop(int port, int (*fn)(int )) |
f0fca04e AT |
353 | { |
354 | int s; | |
06963d0f | 355 | extern char *bind_address; |
f0fca04e | 356 | |
f0fca04e | 357 | /* open an incoming socket */ |
d5d4b282 MP |
358 | s = open_socket_in(SOCK_STREAM, port, bind_address, |
359 | global_opts.af_hint); | |
f0fca04e | 360 | if (s == -1) |
65417579 | 361 | exit_cleanup(RERR_SOCKETIO); |
f0fca04e AT |
362 | |
363 | /* ready to listen */ | |
364 | if (listen(s, 5) == -1) { | |
365 | close(s); | |
65417579 | 366 | exit_cleanup(RERR_SOCKETIO); |
f0fca04e AT |
367 | } |
368 | ||
369 | ||
370 | /* now accept incoming connections - forking a new process | |
371 | for each incoming connection */ | |
372 | while (1) { | |
373 | fd_set fds; | |
374 | int fd; | |
1f0fa931 | 375 | struct sockaddr addr; |
06963d0f | 376 | int in_addrlen = sizeof(addr); |
f0fca04e | 377 | |
15b84e14 DD |
378 | /* close log file before the potentially very long select so |
379 | file can be trimmed by another process instead of growing | |
380 | forever */ | |
381 | log_close(); | |
45a83540 | 382 | |
f0fca04e AT |
383 | FD_ZERO(&fds); |
384 | FD_SET(s, &fds); | |
385 | ||
386 | if (select(s+1, &fds, NULL, NULL, NULL) != 1) { | |
387 | continue; | |
388 | } | |
389 | ||
390 | if(!FD_ISSET(s, &fds)) continue; | |
391 | ||
06963d0f | 392 | fd = accept(s,(struct sockaddr *)&addr,&in_addrlen); |
f0fca04e AT |
393 | |
394 | if (fd == -1) continue; | |
395 | ||
31f440e6 AT |
396 | signal(SIGCHLD, SIG_IGN); |
397 | ||
398 | /* we shouldn't have any children left hanging around | |
399 | but I have had reports that on Digital Unix zombies | |
400 | are produced, so this ensures that they are reaped */ | |
401 | #ifdef WNOHANG | |
0503f060 | 402 | while (waitpid(-1, NULL, WNOHANG) > 0); |
31f440e6 AT |
403 | #endif |
404 | ||
f0fca04e AT |
405 | if (fork()==0) { |
406 | close(s); | |
15b84e14 DD |
407 | /* open log file in child before possibly giving |
408 | up privileges */ | |
409 | log_open(); | |
f0fca04e AT |
410 | _exit(fn(fd)); |
411 | } | |
412 | ||
413 | close(fd); | |
414 | } | |
f0fca04e AT |
415 | } |
416 | ||
417 | ||
418 | enum SOCK_OPT_TYPES {OPT_BOOL,OPT_INT,OPT_ON}; | |
419 | ||
420 | struct | |
421 | { | |
422 | char *name; | |
423 | int level; | |
424 | int option; | |
425 | int value; | |
426 | int opttype; | |
427 | } socket_options[] = { | |
428 | {"SO_KEEPALIVE", SOL_SOCKET, SO_KEEPALIVE, 0, OPT_BOOL}, | |
429 | {"SO_REUSEADDR", SOL_SOCKET, SO_REUSEADDR, 0, OPT_BOOL}, | |
430 | {"SO_BROADCAST", SOL_SOCKET, SO_BROADCAST, 0, OPT_BOOL}, | |
431 | #ifdef TCP_NODELAY | |
432 | {"TCP_NODELAY", IPPROTO_TCP, TCP_NODELAY, 0, OPT_BOOL}, | |
433 | #endif | |
434 | #ifdef IPTOS_LOWDELAY | |
435 | {"IPTOS_LOWDELAY", IPPROTO_IP, IP_TOS, IPTOS_LOWDELAY, OPT_ON}, | |
436 | #endif | |
437 | #ifdef IPTOS_THROUGHPUT | |
438 | {"IPTOS_THROUGHPUT", IPPROTO_IP, IP_TOS, IPTOS_THROUGHPUT, OPT_ON}, | |
439 | #endif | |
440 | #ifdef SO_SNDBUF | |
441 | {"SO_SNDBUF", SOL_SOCKET, SO_SNDBUF, 0, OPT_INT}, | |
442 | #endif | |
443 | #ifdef SO_RCVBUF | |
444 | {"SO_RCVBUF", SOL_SOCKET, SO_RCVBUF, 0, OPT_INT}, | |
445 | #endif | |
446 | #ifdef SO_SNDLOWAT | |
447 | {"SO_SNDLOWAT", SOL_SOCKET, SO_SNDLOWAT, 0, OPT_INT}, | |
448 | #endif | |
449 | #ifdef SO_RCVLOWAT | |
450 | {"SO_RCVLOWAT", SOL_SOCKET, SO_RCVLOWAT, 0, OPT_INT}, | |
451 | #endif | |
452 | #ifdef SO_SNDTIMEO | |
453 | {"SO_SNDTIMEO", SOL_SOCKET, SO_SNDTIMEO, 0, OPT_INT}, | |
454 | #endif | |
455 | #ifdef SO_RCVTIMEO | |
456 | {"SO_RCVTIMEO", SOL_SOCKET, SO_RCVTIMEO, 0, OPT_INT}, | |
457 | #endif | |
458 | {NULL,0,0,0,0}}; | |
459 | ||
460 | ||
461 | ||
462 | /**************************************************************************** | |
463 | set user socket options | |
464 | ****************************************************************************/ | |
465 | void set_socket_options(int fd, char *options) | |
466 | { | |
467 | char *tok; | |
a6801c39 AT |
468 | if (!options || !*options) return; |
469 | ||
f0fca04e AT |
470 | options = strdup(options); |
471 | ||
472 | if (!options) out_of_memory("set_socket_options"); | |
473 | ||
474 | for (tok=strtok(options, " \t,"); tok; tok=strtok(NULL," \t,")) { | |
475 | int ret=0,i; | |
476 | int value = 1; | |
477 | char *p; | |
478 | int got_value = 0; | |
479 | ||
480 | if ((p = strchr(tok,'='))) { | |
481 | *p = 0; | |
482 | value = atoi(p+1); | |
483 | got_value = 1; | |
484 | } | |
485 | ||
486 | for (i=0;socket_options[i].name;i++) | |
487 | if (strcmp(socket_options[i].name,tok)==0) | |
488 | break; | |
489 | ||
490 | if (!socket_options[i].name) { | |
491 | rprintf(FERROR,"Unknown socket option %s\n",tok); | |
492 | continue; | |
493 | } | |
494 | ||
495 | switch (socket_options[i].opttype) { | |
496 | case OPT_BOOL: | |
497 | case OPT_INT: | |
498 | ret = setsockopt(fd,socket_options[i].level, | |
499 | socket_options[i].option,(char *)&value,sizeof(int)); | |
500 | break; | |
501 | ||
502 | case OPT_ON: | |
503 | if (got_value) | |
504 | rprintf(FERROR,"syntax error - %s does not take a value\n",tok); | |
505 | ||
506 | { | |
507 | int on = socket_options[i].value; | |
508 | ret = setsockopt(fd,socket_options[i].level, | |
509 | socket_options[i].option,(char *)&on,sizeof(int)); | |
510 | } | |
511 | break; | |
512 | } | |
513 | ||
514 | if (ret != 0) | |
660c6fbd MP |
515 | rprintf(FERROR, "failed to set socket option %s: %s\n", tok, |
516 | strerror(errno)); | |
f0fca04e AT |
517 | } |
518 | ||
519 | free(options); | |
520 | } | |
521 | ||
522 | /**************************************************************************** | |
523 | become a daemon, discarding the controlling terminal | |
524 | ****************************************************************************/ | |
525 | void become_daemon(void) | |
526 | { | |
b11ed3b1 AT |
527 | int i; |
528 | ||
c46ded46 | 529 | if (fork()) { |
f0fca04e | 530 | _exit(0); |
c46ded46 | 531 | } |
f0fca04e AT |
532 | |
533 | /* detach from the terminal */ | |
534 | #ifdef HAVE_SETSID | |
535 | setsid(); | |
536 | #else | |
537 | #ifdef TIOCNOTTY | |
c46ded46 AT |
538 | i = open("/dev/tty", O_RDWR); |
539 | if (i >= 0) { | |
540 | ioctl(i, (int) TIOCNOTTY, (char *)0); | |
541 | close(i); | |
f0fca04e AT |
542 | } |
543 | #endif /* TIOCNOTTY */ | |
544 | #endif | |
b11ed3b1 AT |
545 | /* make sure that stdin, stdout an stderr don't stuff things |
546 | up (library functions, for example) */ | |
547 | for (i=0;i<3;i++) { | |
548 | close(i); | |
549 | open("/dev/null", O_RDWR); | |
550 | } | |
bc2e93eb | 551 | } |
ff8b29b8 | 552 | |
1f0fa931 MP |
553 | /** |
554 | * Return the IP addr of the client as a string | |
555 | **/ | |
ff8b29b8 AT |
556 | char *client_addr(int fd) |
557 | { | |
1f0fa931 | 558 | struct sockaddr ss; |
06963d0f | 559 | int length = sizeof(ss); |
ff8b29b8 | 560 | static char addr_buf[100]; |
11a5a3c7 AT |
561 | static int initialised; |
562 | ||
563 | if (initialised) return addr_buf; | |
564 | ||
565 | initialised = 1; | |
ff8b29b8 | 566 | |
1f0fa931 | 567 | if (getpeername(fd, &ss, &length)) { |
65417579 | 568 | exit_cleanup(RERR_SOCKETIO); |
ff8b29b8 | 569 | } |
06963d0f | 570 | |
1f0fa931 | 571 | getnameinfo(&ss, length, |
06963d0f | 572 | addr_buf, sizeof(addr_buf), NULL, 0, NI_NUMERICHOST); |
ff8b29b8 AT |
573 | return addr_buf; |
574 | } | |
575 | ||
576 | ||
1f0fa931 MP |
577 | /** |
578 | * Return the DNS name of the client | |
579 | **/ | |
ff8b29b8 AT |
580 | char *client_name(int fd) |
581 | { | |
1f0fa931 | 582 | struct sockaddr ss; |
06963d0f | 583 | int length = sizeof(ss); |
ff8b29b8 | 584 | static char name_buf[100]; |
06963d0f | 585 | static char port_buf[100]; |
de5fb374 | 586 | char *def = "UNKNOWN"; |
11a5a3c7 | 587 | static int initialised; |
06963d0f MP |
588 | struct addrinfo hints, *res, *res0; |
589 | int error; | |
11a5a3c7 AT |
590 | |
591 | if (initialised) return name_buf; | |
592 | ||
593 | initialised = 1; | |
ff8b29b8 | 594 | |
de5fb374 | 595 | strcpy(name_buf,def); |
ff8b29b8 | 596 | |
06963d0f | 597 | if (getpeername(fd, (struct sockaddr *)&ss, &length)) { |
d5d4b282 MP |
598 | /* FIXME: Can we really not continue? */ |
599 | rprintf(FERROR, RSYNC_NAME ": getpeername on fd%d failed: %s\n", | |
c11b8806 | 600 | fd, strerror(errno)); |
65417579 | 601 | exit_cleanup(RERR_SOCKETIO); |
ff8b29b8 AT |
602 | } |
603 | ||
06963d0f | 604 | #ifdef INET6 |
2be5d2da | 605 | if (ss.sa_family == AF_INET6 && |
06963d0f MP |
606 | IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6 *)&ss)->sin6_addr)) { |
607 | struct sockaddr_in6 sin6; | |
608 | struct sockaddr_in *sin; | |
609 | ||
610 | memcpy(&sin6, &ss, sizeof(sin6)); | |
611 | sin = (struct sockaddr_in *)&ss; | |
612 | memset(sin, 0, sizeof(*sin)); | |
613 | sin->sin_family = AF_INET; | |
614 | length = sizeof(struct sockaddr_in); | |
615 | #ifdef HAVE_SOCKADDR_LEN | |
616 | sin->sin_len = length; | |
617 | #endif | |
618 | sin->sin_port = sin6.sin6_port; | |
619 | memcpy(&sin->sin_addr, &sin6.sin6_addr.s6_addr[12], | |
620 | sizeof(sin->sin_addr)); | |
621 | } | |
622 | #endif | |
623 | ||
624 | /* reverse lookup */ | |
625 | if (getnameinfo((struct sockaddr *)&ss, length, | |
626 | name_buf, sizeof(name_buf), port_buf, sizeof(port_buf), | |
627 | NI_NAMEREQD | NI_NUMERICSERV) != 0) { | |
628 | strcpy(name_buf, def); | |
629 | rprintf(FERROR, "reverse name lookup failed\n"); | |
ff8b29b8 AT |
630 | } |
631 | ||
06963d0f MP |
632 | /* forward lookup */ |
633 | memset(&hints, 0, sizeof(hints)); | |
634 | hints.ai_family = PF_UNSPEC; | |
635 | hints.ai_flags = AI_CANONNAME; | |
636 | hints.ai_socktype = SOCK_STREAM; | |
637 | error = getaddrinfo(name_buf, port_buf, &hints, &res0); | |
638 | if (error) { | |
639 | strcpy(name_buf, def); | |
7ef6aa64 MP |
640 | rprintf(FERROR, |
641 | RSYNC_NAME ": forward name lookup for %s failed: %s\n", | |
642 | port_buf, | |
643 | gai_strerror(error)); | |
06963d0f MP |
644 | return name_buf; |
645 | } | |
de5fb374 | 646 | |
06963d0f MP |
647 | /* XXX sin6_flowinfo and other fields */ |
648 | for (res = res0; res; res = res->ai_next) { | |
1f0fa931 | 649 | if (res->ai_family != ss.sa_family) |
06963d0f MP |
650 | continue; |
651 | if (res->ai_addrlen != length) | |
652 | continue; | |
653 | if (memcmp(res->ai_addr, &ss, res->ai_addrlen) == 0) | |
654 | break; | |
655 | } | |
656 | ||
61f543ca | 657 | /* TODO: Do a forward lookup as well to prevent spoofing */ |
06963d0f MP |
658 | |
659 | if (res == NULL) { | |
660 | strcpy(name_buf, def); | |
d5d4b282 MP |
661 | rprintf(FERROR, RSYNC_NAME ": " |
662 | "reverse name lookup mismatch on fd%d - spoofed address?\n", | |
663 | fd); | |
de5fb374 AT |
664 | } |
665 | ||
06963d0f | 666 | freeaddrinfo(res0); |
ff8b29b8 AT |
667 | return name_buf; |
668 | } | |
5c9730a4 | 669 | |
eecd22ff MP |
670 | |
671 | /******************************************************************* | |
672 | this is like socketpair but uses tcp. It is used by the Samba | |
673 | regression test code | |
674 | The function guarantees that nobody else can attach to the socket, | |
675 | or if they do that this function fails and the socket gets closed | |
676 | returns 0 on success, -1 on failure | |
677 | the resulting file descriptors are symmetrical | |
678 | ******************************************************************/ | |
679 | static int socketpair_tcp(int fd[2]) | |
680 | { | |
681 | int listener; | |
682 | struct sockaddr_in sock; | |
683 | struct sockaddr_in sock2; | |
684 | socklen_t socklen = sizeof(sock); | |
685 | int connect_done = 0; | |
686 | ||
687 | fd[0] = fd[1] = listener = -1; | |
688 | ||
689 | memset(&sock, 0, sizeof(sock)); | |
690 | ||
691 | if ((listener = socket(PF_INET, SOCK_STREAM, 0)) == -1) goto failed; | |
692 | ||
693 | memset(&sock2, 0, sizeof(sock2)); | |
694 | #ifdef HAVE_SOCK_SIN_LEN | |
695 | sock2.sin_len = sizeof(sock2); | |
696 | #endif | |
697 | sock2.sin_family = PF_INET; | |
698 | ||
699 | bind(listener, (struct sockaddr *)&sock2, sizeof(sock2)); | |
700 | ||
701 | if (listen(listener, 1) != 0) goto failed; | |
702 | ||
703 | if (getsockname(listener, (struct sockaddr *)&sock, &socklen) != 0) goto failed; | |
704 | ||
705 | if ((fd[1] = socket(PF_INET, SOCK_STREAM, 0)) == -1) goto failed; | |
706 | ||
707 | set_nonblocking(fd[1]); | |
708 | ||
709 | sock.sin_addr.s_addr = htonl(INADDR_LOOPBACK); | |
710 | ||
711 | if (connect(fd[1],(struct sockaddr *)&sock,sizeof(sock)) == -1) { | |
712 | if (errno != EINPROGRESS) goto failed; | |
713 | } else { | |
714 | connect_done = 1; | |
715 | } | |
716 | ||
717 | if ((fd[0] = accept(listener, (struct sockaddr *)&sock, &socklen)) == -1) goto failed; | |
718 | ||
719 | close(listener); | |
720 | if (connect_done == 0) { | |
721 | if (connect(fd[1],(struct sockaddr *)&sock,sizeof(sock)) != 0 | |
722 | && errno != EISCONN) goto failed; | |
723 | } | |
724 | ||
725 | set_blocking (fd[1]); | |
726 | ||
727 | /* all OK! */ | |
728 | return 0; | |
729 | ||
730 | failed: | |
731 | if (fd[0] != -1) close(fd[0]); | |
732 | if (fd[1] != -1) close(fd[1]); | |
733 | if (listener != -1) close(listener); | |
734 | return -1; | |
735 | } | |
736 | ||
737 | ||
738 | /******************************************************************* | |
739 | run a program on a local tcp socket, this is used to launch smbd | |
740 | when regression testing | |
741 | the return value is a socket which is attached to a subprocess | |
742 | running "prog". stdin and stdout are attached. stderr is left | |
743 | attached to the original stderr | |
744 | ******************************************************************/ | |
745 | int sock_exec(const char *prog) | |
746 | { | |
747 | int fd[2]; | |
748 | if (socketpair_tcp(fd) != 0) { | |
749 | rprintf (FERROR, RSYNC_NAME | |
750 | ": socketpair_tcp failed (%s)\n", | |
751 | strerror(errno)); | |
752 | return -1; | |
753 | } | |
754 | if (fork() == 0) { | |
755 | close(fd[0]); | |
756 | close(0); | |
757 | close(1); | |
758 | dup(fd[1]); | |
759 | dup(fd[1]); | |
760 | if (verbose > 3) | |
761 | fprintf (stderr, | |
762 | RSYNC_NAME ": execute socket program \"%s\"\n", | |
763 | prog); | |
764 | exit (system (prog)); | |
765 | } | |
766 | close (fd[1]); | |
767 | return fd[0]; | |
768 | } | |
769 | ||
770 | ||
771 |