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; |
13e29995 | 270 | struct addrinfo hints, *all_ai, *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); | |
13e29995 | 279 | error = getaddrinfo(bind_address, portbuf, &hints, &all_ai); |
06963d0f | 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 | } | |
06963d0f | 285 | |
13e29995 MP |
286 | /* We may not be able to create the socket, if for example the |
287 | * machine knows about IPv6 in the C library, but not in the | |
288 | * kernel. */ | |
289 | for (resp = all_ai; resp; resp = resp->ai_next) { | |
290 | s = socket(resp->ai_family, resp->ai_socktype, | |
291 | resp->ai_protocol); | |
292 | ||
293 | if (s == -1) | |
294 | /* See if there's another address that will work... */ | |
295 | continue; | |
296 | ||
297 | setsockopt(s, SOL_SOCKET, SO_REUSEADDR, | |
298 | (char *)&one, sizeof one); | |
299 | ||
300 | /* now we've got a socket - we need to bind it */ | |
301 | if (bind(s, all_ai->ai_addr, all_ai->ai_addrlen) < 0) { | |
302 | /* Nope, try another */ | |
303 | close(s); | |
304 | continue; | |
b8771f96 MP |
305 | } |
306 | ||
13e29995 | 307 | return s; |
f0fca04e AT |
308 | } |
309 | ||
13e29995 MP |
310 | rprintf(FERROR, RSYNC_NAME ": open inbound socket on port %d failed: " |
311 | "%s\n", | |
312 | port, | |
313 | strerror(errno)); | |
b8771f96 | 314 | |
13e29995 | 315 | freeaddrinfo(all_ai); |
b8771f96 | 316 | return -1; |
f0fca04e AT |
317 | } |
318 | ||
319 | ||
7c1b4daa MP |
320 | /* |
321 | * Determine if a file descriptor is in fact a socket | |
322 | */ | |
f0fca04e AT |
323 | int is_a_socket(int fd) |
324 | { | |
ac2a1a44 MP |
325 | int v; |
326 | socklen_t l; | |
3eb38818 | 327 | l = sizeof(int); |
7c1b4daa MP |
328 | |
329 | /* Parameters to getsockopt, setsockopt etc are very | |
330 | * unstandardized across platforms, so don't be surprised if | |
ac2a1a44 MP |
331 | * there are compiler warnings on e.g. SCO OpenSwerver or AIX. |
332 | * It seems they all eventually get the right idea. | |
7c1b4daa MP |
333 | * |
334 | * Debian says: ``The fifth argument of getsockopt and | |
335 | * setsockopt is in reality an int [*] (and this is what BSD | |
336 | * 4.* and libc4 and libc5 have). Some POSIX confusion | |
337 | * resulted in the present socklen_t. The draft standard has | |
338 | * not been adopted yet, but glibc2 already follows it and | |
339 | * also has socklen_t [*]. See also accept(2).'' | |
340 | * | |
341 | * We now return to your regularly scheduled programming. */ | |
3eb38818 | 342 | return(getsockopt(fd, SOL_SOCKET, SO_TYPE, (char *)&v, &l) == 0); |
f0fca04e AT |
343 | } |
344 | ||
345 | ||
8ef4ffd6 | 346 | void start_accept_loop(int port, int (*fn)(int )) |
f0fca04e AT |
347 | { |
348 | int s; | |
06963d0f | 349 | extern char *bind_address; |
13e29995 | 350 | extern int default_af_hint; |
f0fca04e | 351 | |
f0fca04e | 352 | /* open an incoming socket */ |
13e29995 | 353 | s = open_socket_in(SOCK_STREAM, port, bind_address, default_af_hint); |
f0fca04e | 354 | if (s == -1) |
65417579 | 355 | exit_cleanup(RERR_SOCKETIO); |
f0fca04e AT |
356 | |
357 | /* ready to listen */ | |
358 | if (listen(s, 5) == -1) { | |
359 | close(s); | |
65417579 | 360 | exit_cleanup(RERR_SOCKETIO); |
f0fca04e AT |
361 | } |
362 | ||
363 | ||
364 | /* now accept incoming connections - forking a new process | |
365 | for each incoming connection */ | |
366 | while (1) { | |
367 | fd_set fds; | |
368 | int fd; | |
2d6dbe29 MP |
369 | struct sockaddr_storage addr; |
370 | int addrlen = sizeof(addr); | |
f0fca04e | 371 | |
15b84e14 DD |
372 | /* close log file before the potentially very long select so |
373 | file can be trimmed by another process instead of growing | |
374 | forever */ | |
375 | log_close(); | |
45a83540 | 376 | |
f0fca04e AT |
377 | FD_ZERO(&fds); |
378 | FD_SET(s, &fds); | |
379 | ||
380 | if (select(s+1, &fds, NULL, NULL, NULL) != 1) { | |
381 | continue; | |
382 | } | |
383 | ||
384 | if(!FD_ISSET(s, &fds)) continue; | |
385 | ||
2d6dbe29 | 386 | fd = accept(s,(struct sockaddr *)&addr,&addrlen); |
f0fca04e AT |
387 | |
388 | if (fd == -1) continue; | |
389 | ||
31f440e6 AT |
390 | signal(SIGCHLD, SIG_IGN); |
391 | ||
392 | /* we shouldn't have any children left hanging around | |
393 | but I have had reports that on Digital Unix zombies | |
394 | are produced, so this ensures that they are reaped */ | |
395 | #ifdef WNOHANG | |
0503f060 | 396 | while (waitpid(-1, NULL, WNOHANG) > 0); |
31f440e6 AT |
397 | #endif |
398 | ||
f0fca04e AT |
399 | if (fork()==0) { |
400 | close(s); | |
15b84e14 DD |
401 | /* open log file in child before possibly giving |
402 | up privileges */ | |
403 | log_open(); | |
f0fca04e AT |
404 | _exit(fn(fd)); |
405 | } | |
406 | ||
407 | close(fd); | |
408 | } | |
f0fca04e AT |
409 | } |
410 | ||
411 | ||
412 | enum SOCK_OPT_TYPES {OPT_BOOL,OPT_INT,OPT_ON}; | |
413 | ||
414 | struct | |
415 | { | |
416 | char *name; | |
417 | int level; | |
418 | int option; | |
419 | int value; | |
420 | int opttype; | |
421 | } socket_options[] = { | |
422 | {"SO_KEEPALIVE", SOL_SOCKET, SO_KEEPALIVE, 0, OPT_BOOL}, | |
423 | {"SO_REUSEADDR", SOL_SOCKET, SO_REUSEADDR, 0, OPT_BOOL}, | |
424 | {"SO_BROADCAST", SOL_SOCKET, SO_BROADCAST, 0, OPT_BOOL}, | |
425 | #ifdef TCP_NODELAY | |
426 | {"TCP_NODELAY", IPPROTO_TCP, TCP_NODELAY, 0, OPT_BOOL}, | |
427 | #endif | |
428 | #ifdef IPTOS_LOWDELAY | |
429 | {"IPTOS_LOWDELAY", IPPROTO_IP, IP_TOS, IPTOS_LOWDELAY, OPT_ON}, | |
430 | #endif | |
431 | #ifdef IPTOS_THROUGHPUT | |
432 | {"IPTOS_THROUGHPUT", IPPROTO_IP, IP_TOS, IPTOS_THROUGHPUT, OPT_ON}, | |
433 | #endif | |
434 | #ifdef SO_SNDBUF | |
435 | {"SO_SNDBUF", SOL_SOCKET, SO_SNDBUF, 0, OPT_INT}, | |
436 | #endif | |
437 | #ifdef SO_RCVBUF | |
438 | {"SO_RCVBUF", SOL_SOCKET, SO_RCVBUF, 0, OPT_INT}, | |
439 | #endif | |
440 | #ifdef SO_SNDLOWAT | |
441 | {"SO_SNDLOWAT", SOL_SOCKET, SO_SNDLOWAT, 0, OPT_INT}, | |
442 | #endif | |
443 | #ifdef SO_RCVLOWAT | |
444 | {"SO_RCVLOWAT", SOL_SOCKET, SO_RCVLOWAT, 0, OPT_INT}, | |
445 | #endif | |
446 | #ifdef SO_SNDTIMEO | |
447 | {"SO_SNDTIMEO", SOL_SOCKET, SO_SNDTIMEO, 0, OPT_INT}, | |
448 | #endif | |
449 | #ifdef SO_RCVTIMEO | |
450 | {"SO_RCVTIMEO", SOL_SOCKET, SO_RCVTIMEO, 0, OPT_INT}, | |
451 | #endif | |
452 | {NULL,0,0,0,0}}; | |
453 | ||
454 | ||
455 | ||
456 | /**************************************************************************** | |
457 | set user socket options | |
458 | ****************************************************************************/ | |
459 | void set_socket_options(int fd, char *options) | |
460 | { | |
461 | char *tok; | |
a6801c39 AT |
462 | if (!options || !*options) return; |
463 | ||
f0fca04e AT |
464 | options = strdup(options); |
465 | ||
466 | if (!options) out_of_memory("set_socket_options"); | |
467 | ||
468 | for (tok=strtok(options, " \t,"); tok; tok=strtok(NULL," \t,")) { | |
469 | int ret=0,i; | |
470 | int value = 1; | |
471 | char *p; | |
472 | int got_value = 0; | |
473 | ||
474 | if ((p = strchr(tok,'='))) { | |
475 | *p = 0; | |
476 | value = atoi(p+1); | |
477 | got_value = 1; | |
478 | } | |
479 | ||
480 | for (i=0;socket_options[i].name;i++) | |
481 | if (strcmp(socket_options[i].name,tok)==0) | |
482 | break; | |
483 | ||
484 | if (!socket_options[i].name) { | |
485 | rprintf(FERROR,"Unknown socket option %s\n",tok); | |
486 | continue; | |
487 | } | |
488 | ||
489 | switch (socket_options[i].opttype) { | |
490 | case OPT_BOOL: | |
491 | case OPT_INT: | |
492 | ret = setsockopt(fd,socket_options[i].level, | |
493 | socket_options[i].option,(char *)&value,sizeof(int)); | |
494 | break; | |
495 | ||
496 | case OPT_ON: | |
497 | if (got_value) | |
498 | rprintf(FERROR,"syntax error - %s does not take a value\n",tok); | |
499 | ||
500 | { | |
501 | int on = socket_options[i].value; | |
502 | ret = setsockopt(fd,socket_options[i].level, | |
503 | socket_options[i].option,(char *)&on,sizeof(int)); | |
504 | } | |
505 | break; | |
506 | } | |
507 | ||
508 | if (ret != 0) | |
660c6fbd MP |
509 | rprintf(FERROR, "failed to set socket option %s: %s\n", tok, |
510 | strerror(errno)); | |
f0fca04e AT |
511 | } |
512 | ||
513 | free(options); | |
514 | } | |
515 | ||
516 | /**************************************************************************** | |
517 | become a daemon, discarding the controlling terminal | |
518 | ****************************************************************************/ | |
519 | void become_daemon(void) | |
520 | { | |
b11ed3b1 AT |
521 | int i; |
522 | ||
c46ded46 | 523 | if (fork()) { |
f0fca04e | 524 | _exit(0); |
c46ded46 | 525 | } |
f0fca04e AT |
526 | |
527 | /* detach from the terminal */ | |
528 | #ifdef HAVE_SETSID | |
529 | setsid(); | |
530 | #else | |
531 | #ifdef TIOCNOTTY | |
c46ded46 AT |
532 | i = open("/dev/tty", O_RDWR); |
533 | if (i >= 0) { | |
534 | ioctl(i, (int) TIOCNOTTY, (char *)0); | |
535 | close(i); | |
f0fca04e AT |
536 | } |
537 | #endif /* TIOCNOTTY */ | |
538 | #endif | |
b11ed3b1 AT |
539 | /* make sure that stdin, stdout an stderr don't stuff things |
540 | up (library functions, for example) */ | |
541 | for (i=0;i<3;i++) { | |
542 | close(i); | |
543 | open("/dev/null", O_RDWR); | |
544 | } | |
bc2e93eb | 545 | } |
ff8b29b8 | 546 | |
1f0fa931 MP |
547 | /** |
548 | * Return the IP addr of the client as a string | |
549 | **/ | |
ff8b29b8 AT |
550 | char *client_addr(int fd) |
551 | { | |
2d6dbe29 | 552 | struct sockaddr_storage ss; |
06963d0f | 553 | int length = sizeof(ss); |
ff8b29b8 | 554 | static char addr_buf[100]; |
11a5a3c7 AT |
555 | static int initialised; |
556 | ||
557 | if (initialised) return addr_buf; | |
558 | ||
559 | initialised = 1; | |
ff8b29b8 | 560 | |
2d6dbe29 | 561 | if (getpeername(fd, (struct sockaddr *)&ss, &length)) { |
65417579 | 562 | exit_cleanup(RERR_SOCKETIO); |
ff8b29b8 | 563 | } |
06963d0f | 564 | |
2d6dbe29 | 565 | getnameinfo((struct sockaddr *)&ss, length, |
06963d0f | 566 | addr_buf, sizeof(addr_buf), NULL, 0, NI_NUMERICHOST); |
ff8b29b8 AT |
567 | return addr_buf; |
568 | } | |
569 | ||
570 | ||
51f289d1 | 571 | static int get_sockaddr_family(const struct sockaddr_storage *ss) |
d91c8c50 MP |
572 | { |
573 | return ((struct sockaddr *) ss)->sa_family; | |
574 | } | |
575 | ||
576 | ||
1f0fa931 MP |
577 | /** |
578 | * Return the DNS name of the client | |
579 | **/ | |
ff8b29b8 AT |
580 | char *client_name(int fd) |
581 | { | |
2d6dbe29 | 582 | struct sockaddr_storage 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 |
d91c8c50 | 605 | if (get_sockaddr_family(&ss) == 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) { | |
d91c8c50 | 649 | if (res->ai_family != get_sockaddr_family(&ss)) |
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 |