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 | ||
21 | /* | |
22 | socket functions used in rsync | |
23 | ||
24 | */ | |
25 | ||
f0fca04e AT |
26 | #include "rsync.h" |
27 | ||
06963d0f MP |
28 | #ifndef HAVE_GETADDRINFO |
29 | #include "lib/addrinfo.h" | |
30 | #endif | |
31 | ||
32 | extern int af; | |
4c3b4b25 | 33 | |
660c6fbd MP |
34 | /* Establish a proxy connection on an open socket to a web roxy by |
35 | * using the CONNECT method. */ | |
4c3b4b25 AT |
36 | static int establish_proxy_connection(int fd, char *host, int port) |
37 | { | |
38 | char buffer[1024]; | |
39 | char *cp; | |
40 | ||
8950ac03 | 41 | snprintf(buffer, sizeof(buffer), "CONNECT %s:%d HTTP/1.0\r\n\r\n", host, port); |
4c3b4b25 | 42 | if (write(fd, buffer, strlen(buffer)) != strlen(buffer)) { |
660c6fbd | 43 | rprintf(FERROR, "failed to write to proxy: %s\n", |
4c3b4b25 AT |
44 | strerror(errno)); |
45 | return -1; | |
46 | } | |
47 | ||
48 | for (cp = buffer; cp < &buffer[sizeof(buffer) - 1]; cp++) { | |
49 | if (read(fd, cp, 1) != 1) { | |
660c6fbd MP |
50 | rprintf(FERROR, "failed to read from proxy: %s\n", |
51 | strerror(errno)); | |
4c3b4b25 AT |
52 | return -1; |
53 | } | |
54 | if (*cp == '\n') | |
55 | break; | |
56 | } | |
57 | ||
58 | if (*cp != '\n') | |
59 | cp++; | |
60 | *cp-- = '\0'; | |
61 | if (*cp == '\r') | |
62 | *cp = '\0'; | |
63 | if (strncmp(buffer, "HTTP/", 5) != 0) { | |
64 | rprintf(FERROR, "bad response from proxy - %s\n", | |
65 | buffer); | |
66 | return -1; | |
67 | } | |
68 | for (cp = &buffer[5]; isdigit(*cp) || (*cp == '.'); cp++) | |
69 | ; | |
70 | while (*cp == ' ') | |
71 | cp++; | |
72 | if (*cp != '2') { | |
73 | rprintf(FERROR, "bad response from proxy - %s\n", | |
74 | buffer); | |
75 | return -1; | |
76 | } | |
77 | /* throw away the rest of the HTTP header */ | |
78 | while (1) { | |
79 | for (cp = buffer; cp < &buffer[sizeof(buffer) - 1]; | |
80 | cp++) { | |
81 | if (read(fd, cp, 1) != 1) { | |
660c6fbd MP |
82 | rprintf(FERROR, "failed to read from proxy: %s\n", |
83 | strerror(errno)); | |
4c3b4b25 AT |
84 | return -1; |
85 | } | |
86 | if (*cp == '\n') | |
87 | break; | |
88 | } | |
89 | if ((cp > buffer) && (*cp == '\n')) | |
90 | cp--; | |
91 | if ((cp == buffer) && ((*cp == '\n') || (*cp == '\r'))) | |
92 | break; | |
93 | } | |
94 | return 0; | |
95 | } | |
96 | ||
97 | ||
eecd22ff | 98 | |
06963d0f MP |
99 | /** Open a socket to a tcp remote host with the specified port . |
100 | * | |
101 | * Based on code from Warren. Proxy support by Stephen Rothwell | |
102 | * | |
103 | * | |
104 | * @param bind_address Local address to use. Normally NULL to get the stack default. | |
105 | **/ | |
106 | int open_socket_out(char *host, int port, const char *bind_address) | |
bc2e93eb | 107 | { |
f0fca04e | 108 | int type = SOCK_STREAM; |
06963d0f MP |
109 | int error; |
110 | int s; | |
111 | int result; | |
112 | struct addrinfo hints, *res0, *res; | |
113 | char portbuf[10]; | |
4c3b4b25 | 114 | char *h; |
4c3b4b25 AT |
115 | int proxied = 0; |
116 | char buffer[1024]; | |
117 | char *cp; | |
118 | ||
660c6fbd MP |
119 | /* if we have a RSYNC_PROXY env variable then redirect our |
120 | * connetcion via a web proxy at the given address. The format | |
121 | * is hostname:port */ | |
4c3b4b25 AT |
122 | h = getenv("RSYNC_PROXY"); |
123 | proxied = (h != NULL) && (*h != '\0'); | |
124 | ||
125 | if (proxied) { | |
126 | strlcpy(buffer, h, sizeof(buffer)); | |
127 | cp = strchr(buffer, ':'); | |
128 | if (cp == NULL) { | |
660c6fbd MP |
129 | rprintf(FERROR, |
130 | "invalid proxy specification: should be HOST:PORT\n"); | |
4c3b4b25 AT |
131 | return -1; |
132 | } | |
133 | *cp++ = '\0'; | |
06963d0f | 134 | strcpy(portbuf, cp); |
4c3b4b25 AT |
135 | h = buffer; |
136 | } else { | |
06963d0f | 137 | snprintf(portbuf, sizeof(portbuf), "%d", port); |
4c3b4b25 | 138 | h = host; |
4c3b4b25 | 139 | } |
f0fca04e | 140 | |
06963d0f MP |
141 | memset(&hints, 0, sizeof(hints)); |
142 | hints.ai_family = af; | |
143 | hints.ai_socktype = type; | |
144 | error = getaddrinfo(h, portbuf, &hints, &res0); | |
145 | if (error) { | |
7ef6aa64 | 146 | rprintf(FERROR, RSYNC_NAME ": getaddrinfo: %s: %s\n", portbuf, gai_strerror(error)); |
f0fca04e AT |
147 | return -1; |
148 | } | |
149 | ||
06963d0f MP |
150 | s = -1; |
151 | for (res = res0; res; res = res->ai_next) { | |
152 | s = socket(res->ai_family, res->ai_socktype, res->ai_protocol); | |
153 | if (s < 0) | |
154 | continue; | |
f0fca04e | 155 | |
06963d0f MP |
156 | if (bind_address) { |
157 | struct addrinfo bhints, *bres; | |
158 | ||
159 | memset(&bhints, 0, sizeof(bhints)); | |
160 | bhints.ai_family = res->ai_family; | |
161 | bhints.ai_socktype = type; | |
162 | bhints.ai_flags = AI_PASSIVE; | |
163 | error = getaddrinfo(bind_address, NULL, &bhints, &bres); | |
164 | if (error) { | |
7ef6aa64 MP |
165 | rprintf(FERROR, RSYNC_NAME ": getaddrinfo: bind address %s: %s\n", |
166 | bind_address, gai_strerror(error)); | |
06963d0f MP |
167 | continue; |
168 | } | |
169 | if (bres->ai_next) { | |
7ef6aa64 MP |
170 | rprintf(FERROR, RSYNC_NAME ": getaddrinfo: bind address %s resolved to multiple hosts\n", |
171 | bind_address); | |
06963d0f MP |
172 | freeaddrinfo(bres); |
173 | continue; | |
174 | } | |
175 | bind(s, bres->ai_addr, bres->ai_addrlen); | |
176 | } | |
e30f0657 | 177 | |
06963d0f MP |
178 | if (connect(s, res->ai_addr, res->ai_addrlen) < 0) { |
179 | close(s); | |
180 | s = -1; | |
181 | continue; | |
182 | } | |
183 | if (proxied && | |
184 | establish_proxy_connection(s, host, port) != 0) { | |
185 | close(s); | |
186 | s = -1; | |
187 | continue; | |
188 | } else | |
189 | break; | |
4c3b4b25 | 190 | } |
06963d0f MP |
191 | freeaddrinfo(res0); |
192 | if (s < 0) { | |
7ef6aa64 MP |
193 | rprintf(FERROR, RSYNC_NAME ": failed to connect to %s: %s\n", |
194 | h, strerror(errno)); | |
f0fca04e AT |
195 | return -1; |
196 | } | |
06963d0f | 197 | return s; |
f0fca04e AT |
198 | } |
199 | ||
200 | ||
eecd22ff MP |
201 | /** |
202 | * Open an outgoing socket, but allow for it to be intercepted by | |
203 | * $RSYNC_CONNECT_PROG, which will execute a program across a TCP | |
204 | * socketpair rather than really opening a socket. | |
205 | * | |
206 | * We use this primarily in testing to detect TCP flow bugs, but not | |
207 | * cause security problems by really opening remote connections. | |
208 | * | |
209 | * This is based on the Samba LIBSMB_PROG feature. | |
06963d0f MP |
210 | * |
211 | * @param bind_address Local address to use. Normally NULL to get the stack default. | |
eecd22ff MP |
212 | **/ |
213 | int open_socket_out_wrapped (char *host, | |
214 | int port, | |
06963d0f | 215 | const char *bind_address) |
eecd22ff MP |
216 | { |
217 | char *prog; | |
218 | ||
219 | if ((prog = getenv ("RSYNC_CONNECT_PROG")) != NULL) | |
220 | return sock_exec (prog); | |
221 | else | |
06963d0f | 222 | return open_socket_out (host, port, bind_address); |
eecd22ff MP |
223 | } |
224 | ||
225 | ||
226 | ||
06963d0f MP |
227 | /** |
228 | * Open a socket of the specified type, port and address for incoming data | |
229 | * | |
230 | * @param bind_address Local address to bind, or NULL to allow it to | |
231 | * default. | |
232 | **/ | |
233 | static int open_socket_in(int type, int port, const char *bind_address) | |
f0fca04e | 234 | { |
f0fca04e | 235 | int one=1; |
06963d0f MP |
236 | int s; |
237 | struct addrinfo hints, *res; | |
238 | char portbuf[10]; | |
239 | int error; | |
240 | ||
241 | memset(&hints, 0, sizeof(hints)); | |
242 | hints.ai_family = af; | |
243 | hints.ai_socktype = type; | |
244 | hints.ai_flags = AI_PASSIVE; | |
245 | snprintf(portbuf, sizeof(portbuf), "%d", port); | |
246 | error = getaddrinfo(bind_address, portbuf, &hints, &res); | |
247 | if (error) { | |
7ef6aa64 MP |
248 | rprintf(FERROR, RSYNC_NAME ": getaddrinfo: bind address %s: %s\n", |
249 | bind_address, gai_strerror(error)); | |
06963d0f MP |
250 | return -1; |
251 | } | |
252 | if (res->ai_next) { | |
7ef6aa64 MP |
253 | rprintf(FERROR, RSYNC_NAME ": getaddrinfo: bind address %s: " |
254 | "resolved to multiple hosts\n", | |
255 | bind_address); | |
06963d0f MP |
256 | freeaddrinfo(res); |
257 | return -1; | |
5c9730a4 | 258 | } |
06963d0f MP |
259 | |
260 | s = socket(res->ai_family, res->ai_socktype, res->ai_protocol); | |
261 | if (s < 0) { | |
7ef6aa64 MP |
262 | rprintf(FERROR, RSYNC_NAME ": open socket in failed: %s\n", |
263 | strerror(errno)); | |
06963d0f | 264 | freeaddrinfo(res); |
f0fca04e AT |
265 | return -1; |
266 | } | |
267 | ||
06963d0f | 268 | setsockopt(s,SOL_SOCKET,SO_REUSEADDR,(char *)&one,sizeof(one)); |
f0fca04e AT |
269 | |
270 | /* now we've got a socket - we need to bind it */ | |
06963d0f MP |
271 | if (bind(s, res->ai_addr, res->ai_addrlen) < 0) { |
272 | rprintf(FERROR, RSYNC_NAME ": bind failed on port %d\n", port); | |
273 | freeaddrinfo(res); | |
274 | close(s); | |
f0fca04e AT |
275 | return -1; |
276 | } | |
277 | ||
06963d0f | 278 | return s; |
f0fca04e AT |
279 | } |
280 | ||
281 | ||
7c1b4daa MP |
282 | /* |
283 | * Determine if a file descriptor is in fact a socket | |
284 | */ | |
f0fca04e AT |
285 | int is_a_socket(int fd) |
286 | { | |
ac2a1a44 MP |
287 | int v; |
288 | socklen_t l; | |
3eb38818 | 289 | l = sizeof(int); |
7c1b4daa MP |
290 | |
291 | /* Parameters to getsockopt, setsockopt etc are very | |
292 | * unstandardized across platforms, so don't be surprised if | |
ac2a1a44 MP |
293 | * there are compiler warnings on e.g. SCO OpenSwerver or AIX. |
294 | * It seems they all eventually get the right idea. | |
7c1b4daa MP |
295 | * |
296 | * Debian says: ``The fifth argument of getsockopt and | |
297 | * setsockopt is in reality an int [*] (and this is what BSD | |
298 | * 4.* and libc4 and libc5 have). Some POSIX confusion | |
299 | * resulted in the present socklen_t. The draft standard has | |
300 | * not been adopted yet, but glibc2 already follows it and | |
301 | * also has socklen_t [*]. See also accept(2).'' | |
302 | * | |
303 | * We now return to your regularly scheduled programming. */ | |
3eb38818 | 304 | return(getsockopt(fd, SOL_SOCKET, SO_TYPE, (char *)&v, &l) == 0); |
f0fca04e AT |
305 | } |
306 | ||
307 | ||
8ef4ffd6 | 308 | void start_accept_loop(int port, int (*fn)(int )) |
f0fca04e AT |
309 | { |
310 | int s; | |
06963d0f | 311 | extern char *bind_address; |
f0fca04e | 312 | |
f0fca04e | 313 | /* open an incoming socket */ |
06963d0f | 314 | s = open_socket_in(SOCK_STREAM, port, bind_address); |
f0fca04e | 315 | if (s == -1) |
65417579 | 316 | exit_cleanup(RERR_SOCKETIO); |
f0fca04e AT |
317 | |
318 | /* ready to listen */ | |
319 | if (listen(s, 5) == -1) { | |
320 | close(s); | |
65417579 | 321 | exit_cleanup(RERR_SOCKETIO); |
f0fca04e AT |
322 | } |
323 | ||
324 | ||
325 | /* now accept incoming connections - forking a new process | |
326 | for each incoming connection */ | |
327 | while (1) { | |
328 | fd_set fds; | |
329 | int fd; | |
06963d0f MP |
330 | struct sockaddr_storage addr; |
331 | int in_addrlen = sizeof(addr); | |
f0fca04e | 332 | |
15b84e14 DD |
333 | /* close log file before the potentially very long select so |
334 | file can be trimmed by another process instead of growing | |
335 | forever */ | |
336 | log_close(); | |
45a83540 | 337 | |
f0fca04e AT |
338 | FD_ZERO(&fds); |
339 | FD_SET(s, &fds); | |
340 | ||
341 | if (select(s+1, &fds, NULL, NULL, NULL) != 1) { | |
342 | continue; | |
343 | } | |
344 | ||
345 | if(!FD_ISSET(s, &fds)) continue; | |
346 | ||
06963d0f | 347 | fd = accept(s,(struct sockaddr *)&addr,&in_addrlen); |
f0fca04e AT |
348 | |
349 | if (fd == -1) continue; | |
350 | ||
31f440e6 AT |
351 | signal(SIGCHLD, SIG_IGN); |
352 | ||
353 | /* we shouldn't have any children left hanging around | |
354 | but I have had reports that on Digital Unix zombies | |
355 | are produced, so this ensures that they are reaped */ | |
356 | #ifdef WNOHANG | |
0503f060 | 357 | while (waitpid(-1, NULL, WNOHANG) > 0); |
31f440e6 AT |
358 | #endif |
359 | ||
f0fca04e AT |
360 | if (fork()==0) { |
361 | close(s); | |
15b84e14 DD |
362 | /* open log file in child before possibly giving |
363 | up privileges */ | |
364 | log_open(); | |
f0fca04e AT |
365 | _exit(fn(fd)); |
366 | } | |
367 | ||
368 | close(fd); | |
369 | } | |
f0fca04e AT |
370 | } |
371 | ||
372 | ||
373 | enum SOCK_OPT_TYPES {OPT_BOOL,OPT_INT,OPT_ON}; | |
374 | ||
375 | struct | |
376 | { | |
377 | char *name; | |
378 | int level; | |
379 | int option; | |
380 | int value; | |
381 | int opttype; | |
382 | } socket_options[] = { | |
383 | {"SO_KEEPALIVE", SOL_SOCKET, SO_KEEPALIVE, 0, OPT_BOOL}, | |
384 | {"SO_REUSEADDR", SOL_SOCKET, SO_REUSEADDR, 0, OPT_BOOL}, | |
385 | {"SO_BROADCAST", SOL_SOCKET, SO_BROADCAST, 0, OPT_BOOL}, | |
386 | #ifdef TCP_NODELAY | |
387 | {"TCP_NODELAY", IPPROTO_TCP, TCP_NODELAY, 0, OPT_BOOL}, | |
388 | #endif | |
389 | #ifdef IPTOS_LOWDELAY | |
390 | {"IPTOS_LOWDELAY", IPPROTO_IP, IP_TOS, IPTOS_LOWDELAY, OPT_ON}, | |
391 | #endif | |
392 | #ifdef IPTOS_THROUGHPUT | |
393 | {"IPTOS_THROUGHPUT", IPPROTO_IP, IP_TOS, IPTOS_THROUGHPUT, OPT_ON}, | |
394 | #endif | |
395 | #ifdef SO_SNDBUF | |
396 | {"SO_SNDBUF", SOL_SOCKET, SO_SNDBUF, 0, OPT_INT}, | |
397 | #endif | |
398 | #ifdef SO_RCVBUF | |
399 | {"SO_RCVBUF", SOL_SOCKET, SO_RCVBUF, 0, OPT_INT}, | |
400 | #endif | |
401 | #ifdef SO_SNDLOWAT | |
402 | {"SO_SNDLOWAT", SOL_SOCKET, SO_SNDLOWAT, 0, OPT_INT}, | |
403 | #endif | |
404 | #ifdef SO_RCVLOWAT | |
405 | {"SO_RCVLOWAT", SOL_SOCKET, SO_RCVLOWAT, 0, OPT_INT}, | |
406 | #endif | |
407 | #ifdef SO_SNDTIMEO | |
408 | {"SO_SNDTIMEO", SOL_SOCKET, SO_SNDTIMEO, 0, OPT_INT}, | |
409 | #endif | |
410 | #ifdef SO_RCVTIMEO | |
411 | {"SO_RCVTIMEO", SOL_SOCKET, SO_RCVTIMEO, 0, OPT_INT}, | |
412 | #endif | |
413 | {NULL,0,0,0,0}}; | |
414 | ||
415 | ||
416 | ||
417 | /**************************************************************************** | |
418 | set user socket options | |
419 | ****************************************************************************/ | |
420 | void set_socket_options(int fd, char *options) | |
421 | { | |
422 | char *tok; | |
a6801c39 AT |
423 | if (!options || !*options) return; |
424 | ||
f0fca04e AT |
425 | options = strdup(options); |
426 | ||
427 | if (!options) out_of_memory("set_socket_options"); | |
428 | ||
429 | for (tok=strtok(options, " \t,"); tok; tok=strtok(NULL," \t,")) { | |
430 | int ret=0,i; | |
431 | int value = 1; | |
432 | char *p; | |
433 | int got_value = 0; | |
434 | ||
435 | if ((p = strchr(tok,'='))) { | |
436 | *p = 0; | |
437 | value = atoi(p+1); | |
438 | got_value = 1; | |
439 | } | |
440 | ||
441 | for (i=0;socket_options[i].name;i++) | |
442 | if (strcmp(socket_options[i].name,tok)==0) | |
443 | break; | |
444 | ||
445 | if (!socket_options[i].name) { | |
446 | rprintf(FERROR,"Unknown socket option %s\n",tok); | |
447 | continue; | |
448 | } | |
449 | ||
450 | switch (socket_options[i].opttype) { | |
451 | case OPT_BOOL: | |
452 | case OPT_INT: | |
453 | ret = setsockopt(fd,socket_options[i].level, | |
454 | socket_options[i].option,(char *)&value,sizeof(int)); | |
455 | break; | |
456 | ||
457 | case OPT_ON: | |
458 | if (got_value) | |
459 | rprintf(FERROR,"syntax error - %s does not take a value\n",tok); | |
460 | ||
461 | { | |
462 | int on = socket_options[i].value; | |
463 | ret = setsockopt(fd,socket_options[i].level, | |
464 | socket_options[i].option,(char *)&on,sizeof(int)); | |
465 | } | |
466 | break; | |
467 | } | |
468 | ||
469 | if (ret != 0) | |
660c6fbd MP |
470 | rprintf(FERROR, "failed to set socket option %s: %s\n", tok, |
471 | strerror(errno)); | |
f0fca04e AT |
472 | } |
473 | ||
474 | free(options); | |
475 | } | |
476 | ||
477 | /**************************************************************************** | |
478 | become a daemon, discarding the controlling terminal | |
479 | ****************************************************************************/ | |
480 | void become_daemon(void) | |
481 | { | |
b11ed3b1 AT |
482 | int i; |
483 | ||
c46ded46 | 484 | if (fork()) { |
f0fca04e | 485 | _exit(0); |
c46ded46 | 486 | } |
f0fca04e AT |
487 | |
488 | /* detach from the terminal */ | |
489 | #ifdef HAVE_SETSID | |
490 | setsid(); | |
491 | #else | |
492 | #ifdef TIOCNOTTY | |
c46ded46 AT |
493 | i = open("/dev/tty", O_RDWR); |
494 | if (i >= 0) { | |
495 | ioctl(i, (int) TIOCNOTTY, (char *)0); | |
496 | close(i); | |
f0fca04e AT |
497 | } |
498 | #endif /* TIOCNOTTY */ | |
499 | #endif | |
b11ed3b1 AT |
500 | /* make sure that stdin, stdout an stderr don't stuff things |
501 | up (library functions, for example) */ | |
502 | for (i=0;i<3;i++) { | |
503 | close(i); | |
504 | open("/dev/null", O_RDWR); | |
505 | } | |
bc2e93eb | 506 | } |
ff8b29b8 AT |
507 | |
508 | /******************************************************************* | |
509 | return the IP addr of the client as a string | |
510 | ******************************************************************/ | |
511 | char *client_addr(int fd) | |
512 | { | |
06963d0f MP |
513 | struct sockaddr_storage ss; |
514 | int length = sizeof(ss); | |
ff8b29b8 | 515 | static char addr_buf[100]; |
11a5a3c7 AT |
516 | static int initialised; |
517 | ||
518 | if (initialised) return addr_buf; | |
519 | ||
520 | initialised = 1; | |
ff8b29b8 | 521 | |
06963d0f | 522 | if (getpeername(fd, (struct sockaddr *)&ss, &length)) { |
65417579 | 523 | exit_cleanup(RERR_SOCKETIO); |
ff8b29b8 | 524 | } |
06963d0f MP |
525 | |
526 | getnameinfo((struct sockaddr *)&ss, length, | |
527 | addr_buf, sizeof(addr_buf), NULL, 0, NI_NUMERICHOST); | |
ff8b29b8 AT |
528 | return addr_buf; |
529 | } | |
530 | ||
531 | ||
532 | /******************************************************************* | |
533 | return the DNS name of the client | |
534 | ******************************************************************/ | |
535 | char *client_name(int fd) | |
536 | { | |
06963d0f MP |
537 | struct sockaddr_storage ss; |
538 | int length = sizeof(ss); | |
ff8b29b8 | 539 | static char name_buf[100]; |
06963d0f | 540 | static char port_buf[100]; |
de5fb374 | 541 | char *def = "UNKNOWN"; |
11a5a3c7 | 542 | static int initialised; |
06963d0f MP |
543 | struct addrinfo hints, *res, *res0; |
544 | int error; | |
11a5a3c7 AT |
545 | |
546 | if (initialised) return name_buf; | |
547 | ||
548 | initialised = 1; | |
ff8b29b8 | 549 | |
de5fb374 | 550 | strcpy(name_buf,def); |
ff8b29b8 | 551 | |
06963d0f | 552 | if (getpeername(fd, (struct sockaddr *)&ss, &length)) { |
65417579 | 553 | exit_cleanup(RERR_SOCKETIO); |
ff8b29b8 AT |
554 | } |
555 | ||
06963d0f MP |
556 | #ifdef INET6 |
557 | if (ss.ss_family == AF_INET6 && | |
558 | IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6 *)&ss)->sin6_addr)) { | |
559 | struct sockaddr_in6 sin6; | |
560 | struct sockaddr_in *sin; | |
561 | ||
562 | memcpy(&sin6, &ss, sizeof(sin6)); | |
563 | sin = (struct sockaddr_in *)&ss; | |
564 | memset(sin, 0, sizeof(*sin)); | |
565 | sin->sin_family = AF_INET; | |
566 | length = sizeof(struct sockaddr_in); | |
567 | #ifdef HAVE_SOCKADDR_LEN | |
568 | sin->sin_len = length; | |
569 | #endif | |
570 | sin->sin_port = sin6.sin6_port; | |
571 | memcpy(&sin->sin_addr, &sin6.sin6_addr.s6_addr[12], | |
572 | sizeof(sin->sin_addr)); | |
573 | } | |
574 | #endif | |
575 | ||
576 | /* reverse lookup */ | |
577 | if (getnameinfo((struct sockaddr *)&ss, length, | |
578 | name_buf, sizeof(name_buf), port_buf, sizeof(port_buf), | |
579 | NI_NAMEREQD | NI_NUMERICSERV) != 0) { | |
580 | strcpy(name_buf, def); | |
581 | rprintf(FERROR, "reverse name lookup failed\n"); | |
ff8b29b8 AT |
582 | } |
583 | ||
06963d0f MP |
584 | /* forward lookup */ |
585 | memset(&hints, 0, sizeof(hints)); | |
586 | hints.ai_family = PF_UNSPEC; | |
587 | hints.ai_flags = AI_CANONNAME; | |
588 | hints.ai_socktype = SOCK_STREAM; | |
589 | error = getaddrinfo(name_buf, port_buf, &hints, &res0); | |
590 | if (error) { | |
591 | strcpy(name_buf, def); | |
7ef6aa64 MP |
592 | rprintf(FERROR, |
593 | RSYNC_NAME ": forward name lookup for %s failed: %s\n", | |
594 | port_buf, | |
595 | gai_strerror(error)); | |
06963d0f MP |
596 | return name_buf; |
597 | } | |
de5fb374 | 598 | |
06963d0f MP |
599 | /* XXX sin6_flowinfo and other fields */ |
600 | for (res = res0; res; res = res->ai_next) { | |
601 | if (res->ai_family != ss.ss_family) | |
602 | continue; | |
603 | if (res->ai_addrlen != length) | |
604 | continue; | |
605 | if (memcmp(res->ai_addr, &ss, res->ai_addrlen) == 0) | |
606 | break; | |
607 | } | |
608 | ||
609 | /* TODO: Do a forward lookup as well to prevent spoofing */ | |
610 | ||
611 | if (res == NULL) { | |
612 | strcpy(name_buf, def); | |
613 | rprintf(FERROR, | |
614 | "reverse name lookup mismatch - spoofed address?\n"); | |
de5fb374 AT |
615 | } |
616 | ||
06963d0f | 617 | freeaddrinfo(res0); |
ff8b29b8 AT |
618 | return name_buf; |
619 | } | |
5c9730a4 | 620 | |
d58911fb MP |
621 | /** |
622 | Convert a string to an IP address. The string can be a name or | |
623 | dotted decimal number. | |
624 | ||
625 | Returns a pointer to a static in_addr struct -- if you call this | |
626 | more than once then you should copy it. | |
627 | */ | |
5c9730a4 AT |
628 | struct in_addr *ip_address(const char *str) |
629 | { | |
630 | static struct in_addr ret; | |
631 | struct hostent *hp; | |
632 | ||
f8014b86 MP |
633 | if (!str) { |
634 | rprintf (FERROR, "ip_address received NULL name\n"); | |
635 | return NULL; | |
636 | } | |
d58911fb | 637 | |
5c9730a4 AT |
638 | /* try as an IP address */ |
639 | if (inet_aton(str, &ret) != 0) { | |
640 | return &ret; | |
641 | } | |
642 | ||
643 | /* otherwise assume it's a network name of some sort and use | |
644 | gethostbyname */ | |
7d91d5a6 | 645 | if ((hp = gethostbyname (str)) == 0) { |
d58911fb | 646 | rprintf(FERROR, "gethostbyname failed for \"%s\": unknown host?\n",str); |
5c9730a4 AT |
647 | return NULL; |
648 | } | |
649 | ||
650 | if (hp->h_addr == NULL) { | |
d58911fb | 651 | rprintf(FERROR, "gethostbyname: host address is invalid for host \"%s\"\n",str); |
5c9730a4 AT |
652 | return NULL; |
653 | } | |
654 | ||
7d91d5a6 | 655 | if (hp->h_length > sizeof ret) { |
d58911fb MP |
656 | rprintf(FERROR, "gethostbyname: host address for \"%s\" is too large\n", |
657 | str); | |
5c9730a4 AT |
658 | return NULL; |
659 | } | |
660 | ||
7d91d5a6 MP |
661 | if (hp->h_addrtype != AF_INET) { |
662 | rprintf (FERROR, "gethostname: host address for \"%s\" is not IPv4\n", | |
663 | str); | |
664 | return NULL; | |
665 | } | |
666 | ||
667 | /* This is kind of difficult. The only field in ret is | |
668 | s_addr, which is the IP address as a 32-bit int. On | |
669 | UNICOS, s_addr is in fact a *bitfield* for reasons best | |
670 | know to Cray. This means we can't memcpy in to it. On the | |
671 | other hand, h_addr is a char*, so we can't just assign. | |
672 | ||
673 | Since there's meant to be only one field inside the in_addr | |
674 | structure we will try just copying over the top and see how | |
675 | that goes. */ | |
676 | memcpy (&ret, hp->h_addr, hp->h_length); | |
5c9730a4 | 677 | |
7d91d5a6 | 678 | return &ret; |
5c9730a4 | 679 | } |
eecd22ff MP |
680 | |
681 | ||
682 | ||
683 | /******************************************************************* | |
684 | this is like socketpair but uses tcp. It is used by the Samba | |
685 | regression test code | |
686 | The function guarantees that nobody else can attach to the socket, | |
687 | or if they do that this function fails and the socket gets closed | |
688 | returns 0 on success, -1 on failure | |
689 | the resulting file descriptors are symmetrical | |
690 | ******************************************************************/ | |
691 | static int socketpair_tcp(int fd[2]) | |
692 | { | |
693 | int listener; | |
694 | struct sockaddr_in sock; | |
695 | struct sockaddr_in sock2; | |
696 | socklen_t socklen = sizeof(sock); | |
697 | int connect_done = 0; | |
698 | ||
699 | fd[0] = fd[1] = listener = -1; | |
700 | ||
701 | memset(&sock, 0, sizeof(sock)); | |
702 | ||
703 | if ((listener = socket(PF_INET, SOCK_STREAM, 0)) == -1) goto failed; | |
704 | ||
705 | memset(&sock2, 0, sizeof(sock2)); | |
706 | #ifdef HAVE_SOCK_SIN_LEN | |
707 | sock2.sin_len = sizeof(sock2); | |
708 | #endif | |
709 | sock2.sin_family = PF_INET; | |
710 | ||
711 | bind(listener, (struct sockaddr *)&sock2, sizeof(sock2)); | |
712 | ||
713 | if (listen(listener, 1) != 0) goto failed; | |
714 | ||
715 | if (getsockname(listener, (struct sockaddr *)&sock, &socklen) != 0) goto failed; | |
716 | ||
717 | if ((fd[1] = socket(PF_INET, SOCK_STREAM, 0)) == -1) goto failed; | |
718 | ||
719 | set_nonblocking(fd[1]); | |
720 | ||
721 | sock.sin_addr.s_addr = htonl(INADDR_LOOPBACK); | |
722 | ||
723 | if (connect(fd[1],(struct sockaddr *)&sock,sizeof(sock)) == -1) { | |
724 | if (errno != EINPROGRESS) goto failed; | |
725 | } else { | |
726 | connect_done = 1; | |
727 | } | |
728 | ||
729 | if ((fd[0] = accept(listener, (struct sockaddr *)&sock, &socklen)) == -1) goto failed; | |
730 | ||
731 | close(listener); | |
732 | if (connect_done == 0) { | |
733 | if (connect(fd[1],(struct sockaddr *)&sock,sizeof(sock)) != 0 | |
734 | && errno != EISCONN) goto failed; | |
735 | } | |
736 | ||
737 | set_blocking (fd[1]); | |
738 | ||
739 | /* all OK! */ | |
740 | return 0; | |
741 | ||
742 | failed: | |
743 | if (fd[0] != -1) close(fd[0]); | |
744 | if (fd[1] != -1) close(fd[1]); | |
745 | if (listener != -1) close(listener); | |
746 | return -1; | |
747 | } | |
748 | ||
749 | ||
750 | /******************************************************************* | |
751 | run a program on a local tcp socket, this is used to launch smbd | |
752 | when regression testing | |
753 | the return value is a socket which is attached to a subprocess | |
754 | running "prog". stdin and stdout are attached. stderr is left | |
755 | attached to the original stderr | |
756 | ******************************************************************/ | |
757 | int sock_exec(const char *prog) | |
758 | { | |
759 | int fd[2]; | |
760 | if (socketpair_tcp(fd) != 0) { | |
761 | rprintf (FERROR, RSYNC_NAME | |
762 | ": socketpair_tcp failed (%s)\n", | |
763 | strerror(errno)); | |
764 | return -1; | |
765 | } | |
766 | if (fork() == 0) { | |
767 | close(fd[0]); | |
768 | close(0); | |
769 | close(1); | |
770 | dup(fd[1]); | |
771 | dup(fd[1]); | |
772 | if (verbose > 3) | |
773 | fprintf (stderr, | |
774 | RSYNC_NAME ": execute socket program \"%s\"\n", | |
775 | prog); | |
776 | exit (system (prog)); | |
777 | } | |
778 | close (fd[1]); | |
779 | return fd[0]; | |
780 | } | |
781 | ||
782 | ||
783 |