Commit | Line | Data |
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7c1b4daa MP |
1 | /* -*- c-file-style: "linux" -*- |
2 | ||
3 | Copyright (C) 1998-2000 by Andrew Tridgell | |
bc2e93eb AT |
4 | |
5 | This program is free software; you can redistribute it and/or modify | |
6 | it under the terms of the GNU General Public License as published by | |
7 | the Free Software Foundation; either version 2 of the License, or | |
8 | (at your option) any later version. | |
9 | ||
10 | This program is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | GNU General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU General Public License | |
16 | along with this program; if not, write to the Free Software | |
17 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
18 | */ | |
19 | ||
20 | /* | |
21 | socket functions used in rsync | |
22 | ||
23 | */ | |
24 | ||
f0fca04e AT |
25 | #include "rsync.h" |
26 | ||
4c3b4b25 AT |
27 | |
28 | /* establish a proxy connection on an open socket to a web roxy by using the CONNECT | |
29 | method */ | |
30 | static int establish_proxy_connection(int fd, char *host, int port) | |
31 | { | |
32 | char buffer[1024]; | |
33 | char *cp; | |
34 | ||
35 | slprintf(buffer, sizeof(buffer), "CONNECT %s:%d HTTP/1.0\r\n\r\n", host, port); | |
36 | if (write(fd, buffer, strlen(buffer)) != strlen(buffer)) { | |
37 | rprintf(FERROR, "failed to write to proxy - %s\n", | |
38 | strerror(errno)); | |
39 | return -1; | |
40 | } | |
41 | ||
42 | for (cp = buffer; cp < &buffer[sizeof(buffer) - 1]; cp++) { | |
43 | if (read(fd, cp, 1) != 1) { | |
44 | rprintf(FERROR, "failed to read from proxy\n"); | |
45 | return -1; | |
46 | } | |
47 | if (*cp == '\n') | |
48 | break; | |
49 | } | |
50 | ||
51 | if (*cp != '\n') | |
52 | cp++; | |
53 | *cp-- = '\0'; | |
54 | if (*cp == '\r') | |
55 | *cp = '\0'; | |
56 | if (strncmp(buffer, "HTTP/", 5) != 0) { | |
57 | rprintf(FERROR, "bad response from proxy - %s\n", | |
58 | buffer); | |
59 | return -1; | |
60 | } | |
61 | for (cp = &buffer[5]; isdigit(*cp) || (*cp == '.'); cp++) | |
62 | ; | |
63 | while (*cp == ' ') | |
64 | cp++; | |
65 | if (*cp != '2') { | |
66 | rprintf(FERROR, "bad response from proxy - %s\n", | |
67 | buffer); | |
68 | return -1; | |
69 | } | |
70 | /* throw away the rest of the HTTP header */ | |
71 | while (1) { | |
72 | for (cp = buffer; cp < &buffer[sizeof(buffer) - 1]; | |
73 | cp++) { | |
74 | if (read(fd, cp, 1) != 1) { | |
75 | rprintf(FERROR, "failed to read from proxy\n"); | |
76 | return -1; | |
77 | } | |
78 | if (*cp == '\n') | |
79 | break; | |
80 | } | |
81 | if ((cp > buffer) && (*cp == '\n')) | |
82 | cp--; | |
83 | if ((cp == buffer) && ((*cp == '\n') || (*cp == '\r'))) | |
84 | break; | |
85 | } | |
86 | return 0; | |
87 | } | |
88 | ||
89 | ||
f0fca04e | 90 | /* open a socket to a tcp remote host with the specified port |
4c3b4b25 AT |
91 | based on code from Warren |
92 | proxy support by Stephen Rothwell */ | |
e30f0657 | 93 | int open_socket_out(char *host, int port, struct in_addr *address) |
bc2e93eb | 94 | { |
f0fca04e AT |
95 | int type = SOCK_STREAM; |
96 | struct sockaddr_in sock_out; | |
e30f0657 | 97 | struct sockaddr_in sock; |
f0fca04e AT |
98 | int res; |
99 | struct hostent *hp; | |
4c3b4b25 AT |
100 | char *h; |
101 | unsigned p; | |
102 | int proxied = 0; | |
103 | char buffer[1024]; | |
104 | char *cp; | |
105 | ||
106 | /* if we have a RSYNC_PROXY env variable then redirect our connetcion via a web proxy | |
107 | at the given address. The format is hostname:port */ | |
108 | h = getenv("RSYNC_PROXY"); | |
109 | proxied = (h != NULL) && (*h != '\0'); | |
110 | ||
111 | if (proxied) { | |
112 | strlcpy(buffer, h, sizeof(buffer)); | |
113 | cp = strchr(buffer, ':'); | |
114 | if (cp == NULL) { | |
115 | rprintf(FERROR, "invalid proxy specification\n"); | |
116 | return -1; | |
117 | } | |
118 | *cp++ = '\0'; | |
119 | p = atoi(cp); | |
120 | h = buffer; | |
121 | } else { | |
122 | h = host; | |
123 | p = port; | |
124 | } | |
f0fca04e AT |
125 | |
126 | res = socket(PF_INET, type, 0); | |
127 | if (res == -1) { | |
128 | return -1; | |
129 | } | |
130 | ||
4c3b4b25 | 131 | hp = gethostbyname(h); |
f0fca04e | 132 | if (!hp) { |
4c3b4b25 AT |
133 | rprintf(FERROR,"unknown host: %s\n", h); |
134 | close(res); | |
f0fca04e AT |
135 | return -1; |
136 | } | |
137 | ||
138 | memcpy(&sock_out.sin_addr, hp->h_addr, hp->h_length); | |
4c3b4b25 | 139 | sock_out.sin_port = htons(p); |
f0fca04e AT |
140 | sock_out.sin_family = PF_INET; |
141 | ||
e30f0657 AT |
142 | if (address) { |
143 | sock.sin_addr = *address; | |
144 | sock.sin_port = 0; | |
145 | sock.sin_family = hp->h_addrtype; | |
146 | bind(res, (struct sockaddr * ) &sock,sizeof(sock)); | |
147 | } | |
148 | ||
f0fca04e | 149 | if (connect(res,(struct sockaddr *)&sock_out,sizeof(sock_out))) { |
4c3b4b25 AT |
150 | rprintf(FERROR,"failed to connect to %s - %s\n", h, strerror(errno)); |
151 | close(res); | |
152 | return -1; | |
153 | } | |
154 | ||
155 | if (proxied && establish_proxy_connection(res, host, port) != 0) { | |
f0fca04e | 156 | close(res); |
f0fca04e AT |
157 | return -1; |
158 | } | |
159 | ||
160 | return res; | |
161 | } | |
162 | ||
163 | ||
164 | /**************************************************************************** | |
165 | open a socket of the specified type, port and address for incoming data | |
166 | ****************************************************************************/ | |
5c9730a4 | 167 | static int open_socket_in(int type, int port, struct in_addr *address) |
f0fca04e AT |
168 | { |
169 | struct hostent *hp; | |
170 | struct sockaddr_in sock; | |
d41c7d02 | 171 | char host_name[MAXHOSTNAMELEN]; |
f0fca04e AT |
172 | int res; |
173 | int one=1; | |
174 | ||
175 | /* get my host name */ | |
176 | if (gethostname(host_name, sizeof(host_name)) == -1) { | |
177 | rprintf(FERROR,"gethostname failed\n"); | |
178 | return -1; | |
179 | } | |
180 | ||
181 | /* get host info */ | |
182 | if ((hp = gethostbyname(host_name)) == 0) { | |
183 | rprintf(FERROR,"gethostbyname: Unknown host %s\n",host_name); | |
184 | return -1; | |
185 | } | |
186 | ||
f5780433 | 187 | memset((char *)&sock,0,sizeof(sock)); |
f0fca04e AT |
188 | memcpy((char *)&sock.sin_addr,(char *)hp->h_addr, hp->h_length); |
189 | sock.sin_port = htons(port); | |
190 | sock.sin_family = hp->h_addrtype; | |
5c9730a4 AT |
191 | if (address) { |
192 | sock.sin_addr = *address; | |
193 | } else { | |
194 | sock.sin_addr.s_addr = INADDR_ANY; | |
195 | } | |
f0fca04e AT |
196 | res = socket(hp->h_addrtype, type, 0); |
197 | if (res == -1) { | |
198 | rprintf(FERROR,"socket failed\n"); | |
199 | return -1; | |
200 | } | |
201 | ||
202 | setsockopt(res,SOL_SOCKET,SO_REUSEADDR,(char *)&one,sizeof(one)); | |
203 | ||
204 | /* now we've got a socket - we need to bind it */ | |
205 | if (bind(res, (struct sockaddr * ) &sock,sizeof(sock)) == -1) { | |
206 | rprintf(FERROR,"bind failed on port %d\n", port); | |
207 | close(res); | |
208 | return -1; | |
209 | } | |
210 | ||
211 | return res; | |
212 | } | |
213 | ||
214 | ||
7c1b4daa MP |
215 | /* |
216 | * Determine if a file descriptor is in fact a socket | |
217 | */ | |
f0fca04e AT |
218 | int is_a_socket(int fd) |
219 | { | |
7c1b4daa | 220 | int v, l; |
3eb38818 | 221 | l = sizeof(int); |
7c1b4daa MP |
222 | |
223 | /* Parameters to getsockopt, setsockopt etc are very | |
224 | * unstandardized across platforms, so don't be surprised if | |
225 | * there are compiler warnings on e.g. SCO OpenSwerver. It | |
226 | * seems they all eventually get the right idea. | |
227 | * | |
228 | * Debian says: ``The fifth argument of getsockopt and | |
229 | * setsockopt is in reality an int [*] (and this is what BSD | |
230 | * 4.* and libc4 and libc5 have). Some POSIX confusion | |
231 | * resulted in the present socklen_t. The draft standard has | |
232 | * not been adopted yet, but glibc2 already follows it and | |
233 | * also has socklen_t [*]. See also accept(2).'' | |
234 | * | |
235 | * We now return to your regularly scheduled programming. */ | |
3eb38818 | 236 | return(getsockopt(fd, SOL_SOCKET, SO_TYPE, (char *)&v, &l) == 0); |
f0fca04e AT |
237 | } |
238 | ||
239 | ||
8ef4ffd6 | 240 | void start_accept_loop(int port, int (*fn)(int )) |
f0fca04e AT |
241 | { |
242 | int s; | |
5c9730a4 | 243 | extern struct in_addr socket_address; |
f0fca04e | 244 | |
f0fca04e | 245 | /* open an incoming socket */ |
5c9730a4 | 246 | s = open_socket_in(SOCK_STREAM, port, &socket_address); |
f0fca04e | 247 | if (s == -1) |
65417579 | 248 | exit_cleanup(RERR_SOCKETIO); |
f0fca04e AT |
249 | |
250 | /* ready to listen */ | |
251 | if (listen(s, 5) == -1) { | |
252 | close(s); | |
65417579 | 253 | exit_cleanup(RERR_SOCKETIO); |
f0fca04e AT |
254 | } |
255 | ||
256 | ||
257 | /* now accept incoming connections - forking a new process | |
258 | for each incoming connection */ | |
259 | while (1) { | |
260 | fd_set fds; | |
261 | int fd; | |
262 | struct sockaddr addr; | |
263 | int in_addrlen = sizeof(addr); | |
264 | ||
15b84e14 DD |
265 | /* close log file before the potentially very long select so |
266 | file can be trimmed by another process instead of growing | |
267 | forever */ | |
268 | log_close(); | |
45a83540 | 269 | |
f0fca04e AT |
270 | FD_ZERO(&fds); |
271 | FD_SET(s, &fds); | |
272 | ||
273 | if (select(s+1, &fds, NULL, NULL, NULL) != 1) { | |
274 | continue; | |
275 | } | |
276 | ||
277 | if(!FD_ISSET(s, &fds)) continue; | |
278 | ||
7c1b4daa | 279 | /* See note above prototypes. */ |
f0fca04e AT |
280 | fd = accept(s,&addr,&in_addrlen); |
281 | ||
282 | if (fd == -1) continue; | |
283 | ||
31f440e6 AT |
284 | signal(SIGCHLD, SIG_IGN); |
285 | ||
286 | /* we shouldn't have any children left hanging around | |
287 | but I have had reports that on Digital Unix zombies | |
288 | are produced, so this ensures that they are reaped */ | |
289 | #ifdef WNOHANG | |
0503f060 | 290 | while (waitpid(-1, NULL, WNOHANG) > 0); |
31f440e6 AT |
291 | #endif |
292 | ||
f0fca04e AT |
293 | if (fork()==0) { |
294 | close(s); | |
295 | ||
15b84e14 DD |
296 | /* open log file in child before possibly giving |
297 | up privileges */ | |
298 | log_open(); | |
299 | ||
f0fca04e AT |
300 | _exit(fn(fd)); |
301 | } | |
302 | ||
303 | close(fd); | |
304 | } | |
f0fca04e AT |
305 | } |
306 | ||
307 | ||
308 | enum SOCK_OPT_TYPES {OPT_BOOL,OPT_INT,OPT_ON}; | |
309 | ||
310 | struct | |
311 | { | |
312 | char *name; | |
313 | int level; | |
314 | int option; | |
315 | int value; | |
316 | int opttype; | |
317 | } socket_options[] = { | |
318 | {"SO_KEEPALIVE", SOL_SOCKET, SO_KEEPALIVE, 0, OPT_BOOL}, | |
319 | {"SO_REUSEADDR", SOL_SOCKET, SO_REUSEADDR, 0, OPT_BOOL}, | |
320 | {"SO_BROADCAST", SOL_SOCKET, SO_BROADCAST, 0, OPT_BOOL}, | |
321 | #ifdef TCP_NODELAY | |
322 | {"TCP_NODELAY", IPPROTO_TCP, TCP_NODELAY, 0, OPT_BOOL}, | |
323 | #endif | |
324 | #ifdef IPTOS_LOWDELAY | |
325 | {"IPTOS_LOWDELAY", IPPROTO_IP, IP_TOS, IPTOS_LOWDELAY, OPT_ON}, | |
326 | #endif | |
327 | #ifdef IPTOS_THROUGHPUT | |
328 | {"IPTOS_THROUGHPUT", IPPROTO_IP, IP_TOS, IPTOS_THROUGHPUT, OPT_ON}, | |
329 | #endif | |
330 | #ifdef SO_SNDBUF | |
331 | {"SO_SNDBUF", SOL_SOCKET, SO_SNDBUF, 0, OPT_INT}, | |
332 | #endif | |
333 | #ifdef SO_RCVBUF | |
334 | {"SO_RCVBUF", SOL_SOCKET, SO_RCVBUF, 0, OPT_INT}, | |
335 | #endif | |
336 | #ifdef SO_SNDLOWAT | |
337 | {"SO_SNDLOWAT", SOL_SOCKET, SO_SNDLOWAT, 0, OPT_INT}, | |
338 | #endif | |
339 | #ifdef SO_RCVLOWAT | |
340 | {"SO_RCVLOWAT", SOL_SOCKET, SO_RCVLOWAT, 0, OPT_INT}, | |
341 | #endif | |
342 | #ifdef SO_SNDTIMEO | |
343 | {"SO_SNDTIMEO", SOL_SOCKET, SO_SNDTIMEO, 0, OPT_INT}, | |
344 | #endif | |
345 | #ifdef SO_RCVTIMEO | |
346 | {"SO_RCVTIMEO", SOL_SOCKET, SO_RCVTIMEO, 0, OPT_INT}, | |
347 | #endif | |
348 | {NULL,0,0,0,0}}; | |
349 | ||
350 | ||
351 | ||
352 | /**************************************************************************** | |
353 | set user socket options | |
354 | ****************************************************************************/ | |
355 | void set_socket_options(int fd, char *options) | |
356 | { | |
357 | char *tok; | |
a6801c39 AT |
358 | if (!options || !*options) return; |
359 | ||
f0fca04e AT |
360 | options = strdup(options); |
361 | ||
362 | if (!options) out_of_memory("set_socket_options"); | |
363 | ||
364 | for (tok=strtok(options, " \t,"); tok; tok=strtok(NULL," \t,")) { | |
365 | int ret=0,i; | |
366 | int value = 1; | |
367 | char *p; | |
368 | int got_value = 0; | |
369 | ||
370 | if ((p = strchr(tok,'='))) { | |
371 | *p = 0; | |
372 | value = atoi(p+1); | |
373 | got_value = 1; | |
374 | } | |
375 | ||
376 | for (i=0;socket_options[i].name;i++) | |
377 | if (strcmp(socket_options[i].name,tok)==0) | |
378 | break; | |
379 | ||
380 | if (!socket_options[i].name) { | |
381 | rprintf(FERROR,"Unknown socket option %s\n",tok); | |
382 | continue; | |
383 | } | |
384 | ||
385 | switch (socket_options[i].opttype) { | |
386 | case OPT_BOOL: | |
387 | case OPT_INT: | |
388 | ret = setsockopt(fd,socket_options[i].level, | |
389 | socket_options[i].option,(char *)&value,sizeof(int)); | |
390 | break; | |
391 | ||
392 | case OPT_ON: | |
393 | if (got_value) | |
394 | rprintf(FERROR,"syntax error - %s does not take a value\n",tok); | |
395 | ||
396 | { | |
397 | int on = socket_options[i].value; | |
398 | ret = setsockopt(fd,socket_options[i].level, | |
399 | socket_options[i].option,(char *)&on,sizeof(int)); | |
400 | } | |
401 | break; | |
402 | } | |
403 | ||
404 | if (ret != 0) | |
405 | rprintf(FERROR,"Failed to set socket option %s\n",tok); | |
406 | } | |
407 | ||
408 | free(options); | |
409 | } | |
410 | ||
411 | /**************************************************************************** | |
412 | become a daemon, discarding the controlling terminal | |
413 | ****************************************************************************/ | |
414 | void become_daemon(void) | |
415 | { | |
b11ed3b1 AT |
416 | int i; |
417 | ||
c46ded46 | 418 | if (fork()) { |
f0fca04e | 419 | _exit(0); |
c46ded46 | 420 | } |
f0fca04e AT |
421 | |
422 | /* detach from the terminal */ | |
423 | #ifdef HAVE_SETSID | |
424 | setsid(); | |
425 | #else | |
426 | #ifdef TIOCNOTTY | |
c46ded46 AT |
427 | i = open("/dev/tty", O_RDWR); |
428 | if (i >= 0) { | |
429 | ioctl(i, (int) TIOCNOTTY, (char *)0); | |
430 | close(i); | |
f0fca04e AT |
431 | } |
432 | #endif /* TIOCNOTTY */ | |
433 | #endif | |
b11ed3b1 AT |
434 | /* make sure that stdin, stdout an stderr don't stuff things |
435 | up (library functions, for example) */ | |
436 | for (i=0;i<3;i++) { | |
437 | close(i); | |
438 | open("/dev/null", O_RDWR); | |
439 | } | |
bc2e93eb | 440 | } |
ff8b29b8 AT |
441 | |
442 | /******************************************************************* | |
443 | return the IP addr of the client as a string | |
444 | ******************************************************************/ | |
445 | char *client_addr(int fd) | |
446 | { | |
447 | struct sockaddr sa; | |
448 | struct sockaddr_in *sockin = (struct sockaddr_in *) (&sa); | |
449 | int length = sizeof(sa); | |
450 | static char addr_buf[100]; | |
11a5a3c7 AT |
451 | static int initialised; |
452 | ||
453 | if (initialised) return addr_buf; | |
454 | ||
455 | initialised = 1; | |
ff8b29b8 AT |
456 | |
457 | if (getpeername(fd, &sa, &length)) { | |
65417579 | 458 | exit_cleanup(RERR_SOCKETIO); |
ff8b29b8 | 459 | } |
11a5a3c7 | 460 | |
37f9805d | 461 | strlcpy(addr_buf,(char *)inet_ntoa(sockin->sin_addr), sizeof(addr_buf)); |
ff8b29b8 AT |
462 | return addr_buf; |
463 | } | |
464 | ||
465 | ||
466 | /******************************************************************* | |
467 | return the DNS name of the client | |
468 | ******************************************************************/ | |
469 | char *client_name(int fd) | |
470 | { | |
471 | struct sockaddr sa; | |
472 | struct sockaddr_in *sockin = (struct sockaddr_in *) (&sa); | |
473 | int length = sizeof(sa); | |
474 | static char name_buf[100]; | |
475 | struct hostent *hp; | |
de5fb374 AT |
476 | char **p; |
477 | char *def = "UNKNOWN"; | |
11a5a3c7 AT |
478 | static int initialised; |
479 | ||
480 | if (initialised) return name_buf; | |
481 | ||
482 | initialised = 1; | |
ff8b29b8 | 483 | |
de5fb374 | 484 | strcpy(name_buf,def); |
ff8b29b8 AT |
485 | |
486 | if (getpeername(fd, &sa, &length)) { | |
65417579 | 487 | exit_cleanup(RERR_SOCKETIO); |
ff8b29b8 AT |
488 | } |
489 | ||
490 | /* Look up the remote host name. */ | |
491 | if ((hp = gethostbyaddr((char *) &sockin->sin_addr, | |
492 | sizeof(sockin->sin_addr), | |
493 | AF_INET))) { | |
37f9805d | 494 | strlcpy(name_buf,(char *)hp->h_name,sizeof(name_buf)); |
ff8b29b8 AT |
495 | } |
496 | ||
de5fb374 AT |
497 | |
498 | /* do a forward lookup as well to prevent spoofing */ | |
499 | hp = gethostbyname(name_buf); | |
500 | if (!hp) { | |
501 | strcpy(name_buf,def); | |
502 | rprintf(FERROR,"reverse name lookup failed\n"); | |
503 | } else { | |
504 | for (p=hp->h_addr_list;*p;p++) { | |
505 | if (memcmp(*p, &sockin->sin_addr, hp->h_length) == 0) { | |
506 | break; | |
507 | } | |
508 | } | |
509 | if (!*p) { | |
510 | strcpy(name_buf,def); | |
511 | rprintf(FERROR,"reverse name lookup mismatch - spoofed address?\n"); | |
512 | } | |
513 | } | |
514 | ||
ff8b29b8 AT |
515 | return name_buf; |
516 | } | |
5c9730a4 AT |
517 | |
518 | /******************************************************************* | |
519 | convert a string to an IP address. The string can be a name or | |
520 | dotted decimal number | |
521 | ******************************************************************/ | |
522 | struct in_addr *ip_address(const char *str) | |
523 | { | |
524 | static struct in_addr ret; | |
525 | struct hostent *hp; | |
526 | ||
527 | /* try as an IP address */ | |
528 | if (inet_aton(str, &ret) != 0) { | |
529 | return &ret; | |
530 | } | |
531 | ||
532 | /* otherwise assume it's a network name of some sort and use | |
533 | gethostbyname */ | |
534 | if ((hp = gethostbyname(str)) == 0) { | |
535 | rprintf(FERROR, "gethostbyname: Unknown host. %s\n",str); | |
536 | return NULL; | |
537 | } | |
538 | ||
539 | if (hp->h_addr == NULL) { | |
540 | rprintf(FERROR, "gethostbyname: host address is invalid for host %s\n",str); | |
541 | return NULL; | |
542 | } | |
543 | ||
544 | if (hp->h_length > sizeof(ret)) { | |
545 | rprintf(FERROR, "gethostbyname: host address is too large\n"); | |
546 | return NULL; | |
547 | } | |
548 | ||
549 | memcpy(&ret.s_addr, hp->h_addr, hp->h_length); | |
550 | ||
551 | return(&ret); | |
552 | } |