Commit | Line | Data |
---|---|---|
3591c066 AT |
1 | /* |
2 | Copyright (C) Andrew Tridgell 1998 | |
3 | ||
4 | This program is free software; you can redistribute it and/or modify | |
5 | it under the terms of the GNU General Public License as published by | |
6 | the Free Software Foundation; either version 2 of the License, or | |
7 | (at your option) any later version. | |
8 | ||
9 | This program is distributed in the hope that it will be useful, | |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | GNU General Public License for more details. | |
13 | ||
14 | You should have received a copy of the GNU General Public License | |
15 | along with this program; if not, write to the Free Software | |
16 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
17 | */ | |
18 | ||
19 | /* the socket based protocol for setting up a connection wit rsyncd */ | |
20 | ||
21 | #include "rsync.h" | |
22 | ||
23 | extern int module_id; | |
24 | extern int read_only; | |
25 | extern int verbose; | |
26 | extern int rsync_port; | |
97cb8dc2 | 27 | char *auth_user; |
3591c066 AT |
28 | |
29 | int start_socket_client(char *host, char *path, int argc, char *argv[]) | |
30 | { | |
31 | int fd, i; | |
32 | char *sargs[MAX_ARGS]; | |
33 | int sargc=0; | |
e42c9458 | 34 | char line[MAXPATHLEN]; |
bcb7e502 | 35 | char *p, *user=NULL; |
13c5fc0e | 36 | extern int remote_version; |
8d9dc9f9 AT |
37 | extern int am_client; |
38 | extern int am_sender; | |
3591c066 | 39 | |
f98df1d9 AT |
40 | if (*path == '/') { |
41 | rprintf(FERROR,"ERROR: The remote path must start with a module name\n"); | |
42 | return -1; | |
43 | } | |
44 | ||
bcb7e502 AT |
45 | p = strchr(host, '@'); |
46 | if (p) { | |
47 | user = host; | |
48 | host = p+1; | |
49 | *p = 0; | |
50 | } | |
51 | ||
52 | if (!user) user = getenv("USER"); | |
53 | if (!user) user = getenv("LOGNAME"); | |
54 | ||
8d9dc9f9 AT |
55 | am_client = 1; |
56 | ||
3591c066 AT |
57 | fd = open_socket_out(host, rsync_port); |
58 | if (fd == -1) { | |
65417579 | 59 | exit_cleanup(RERR_SOCKETIO); |
3591c066 AT |
60 | } |
61 | ||
62 | server_options(sargs,&sargc); | |
63 | ||
64 | sargs[sargc++] = "."; | |
65 | ||
66 | if (path && *path) | |
67 | sargs[sargc++] = path; | |
68 | ||
69 | sargs[sargc] = NULL; | |
70 | ||
91eee594 AT |
71 | io_printf(fd,"@RSYNCD: %d\n", PROTOCOL_VERSION); |
72 | ||
3591c066 AT |
73 | if (!read_line(fd, line, sizeof(line)-1)) { |
74 | return -1; | |
75 | } | |
76 | ||
13c5fc0e | 77 | if (sscanf(line,"@RSYNCD: %d", &remote_version) != 1) { |
3591c066 AT |
78 | return -1; |
79 | } | |
80 | ||
2c91d3d3 AT |
81 | p = strchr(path,'/'); |
82 | if (p) *p = 0; | |
83 | io_printf(fd,"%s\n",path); | |
84 | if (p) *p = '/'; | |
85 | ||
3591c066 AT |
86 | while (1) { |
87 | if (!read_line(fd, line, sizeof(line)-1)) { | |
88 | return -1; | |
89 | } | |
31593dd6 | 90 | |
31593dd6 | 91 | if (strncmp(line,"@RSYNCD: AUTHREQD ",18) == 0) { |
bcb7e502 | 92 | auth_client(fd, user, line+18); |
31593dd6 AT |
93 | continue; |
94 | } | |
31593dd6 | 95 | |
3591c066 AT |
96 | if (strcmp(line,"@RSYNCD: OK") == 0) break; |
97 | rprintf(FINFO,"%s\n", line); | |
98 | } | |
99 | ||
100 | for (i=0;i<sargc;i++) { | |
101 | io_printf(fd,"%s\n", sargs[i]); | |
102 | } | |
103 | io_printf(fd,"\n"); | |
104 | ||
8d9dc9f9 AT |
105 | if (remote_version > 17 && !am_sender) |
106 | io_start_multiplex_in(fd); | |
107 | ||
3591c066 AT |
108 | return client_run(fd, fd, -1, argc, argv); |
109 | } | |
110 | ||
111 | ||
112 | ||
113 | static int rsync_module(int fd, int i) | |
114 | { | |
115 | int argc=0; | |
116 | char *argv[MAX_ARGS]; | |
117 | char **argp; | |
e42c9458 | 118 | char line[MAXPATHLEN]; |
1a016bfd AT |
119 | uid_t uid = (uid_t)-2; |
120 | gid_t gid = (gid_t)-2; | |
8ef4ffd6 | 121 | char *p; |
56c473b7 AT |
122 | char *addr = client_addr(fd); |
123 | char *host = client_name(fd); | |
874895d5 | 124 | char *name = lp_name(i); |
8638dd48 | 125 | int use_chroot = lp_use_chroot(i); |
874895d5 | 126 | int start_glob=0; |
41979ff8 | 127 | int ret; |
7b372642 AT |
128 | char *request=NULL; |
129 | extern int am_sender; | |
8d9dc9f9 | 130 | extern int remote_version; |
943882a2 | 131 | extern int am_root; |
56c473b7 AT |
132 | |
133 | if (!allow_access(addr, host, lp_hosts_allow(i), lp_hosts_deny(i))) { | |
134 | rprintf(FERROR,"rsync denied on module %s from %s (%s)\n", | |
874895d5 | 135 | name, client_name(fd), client_addr(fd)); |
c8e78d87 | 136 | io_printf(fd,"@ERROR: access denied to %s from %s (%s)\n", |
874895d5 | 137 | name, client_name(fd), client_addr(fd)); |
56c473b7 AT |
138 | return -1; |
139 | } | |
3591c066 | 140 | |
0c515f17 | 141 | if (!claim_connection(lp_lock_file(), lp_max_connections())) { |
8d72ef6e AT |
142 | if (errno) { |
143 | rprintf(FERROR,"failed to open lock file %s : %s\n", | |
144 | lp_lock_file(), strerror(errno)); | |
145 | io_printf(fd,"@ERROR: failed to open lock file %s : %s\n", | |
146 | lp_lock_file(), strerror(errno)); | |
147 | } else { | |
148 | rprintf(FERROR,"max connections (%d) reached\n", | |
149 | lp_max_connections()); | |
150 | io_printf(fd,"@ERROR: max connections (%d) reached - try again later\n", lp_max_connections()); | |
151 | } | |
0c515f17 AT |
152 | return -1; |
153 | } | |
154 | ||
31593dd6 | 155 | |
97cb8dc2 | 156 | auth_user = auth_server(fd, i, addr, "@RSYNCD: AUTHREQD "); |
d0d56395 | 157 | |
97cb8dc2 | 158 | if (!auth_user) { |
d0d56395 AT |
159 | rprintf(FERROR,"auth failed on module %s from %s (%s)\n", |
160 | name, client_name(fd), client_addr(fd)); | |
161 | io_printf(fd,"@ERROR: auth failed on module %s\n",name); | |
162 | return -1; | |
163 | } | |
164 | ||
3591c066 AT |
165 | module_id = i; |
166 | ||
167 | if (lp_read_only(i)) | |
168 | read_only = 1; | |
169 | ||
8ef4ffd6 AT |
170 | p = lp_uid(i); |
171 | if (!name_to_uid(p, &uid)) { | |
172 | if (!isdigit(*p)) { | |
173 | rprintf(FERROR,"Invalid uid %s\n", p); | |
c8e78d87 | 174 | io_printf(fd,"@ERROR: invalid uid\n"); |
8ef4ffd6 AT |
175 | return -1; |
176 | } | |
177 | uid = atoi(p); | |
178 | } | |
179 | ||
180 | p = lp_gid(i); | |
181 | if (!name_to_gid(p, &gid)) { | |
182 | if (!isdigit(*p)) { | |
183 | rprintf(FERROR,"Invalid gid %s\n", p); | |
c8e78d87 | 184 | io_printf(fd,"@ERROR: invalid gid\n"); |
8ef4ffd6 AT |
185 | return -1; |
186 | } | |
187 | gid = atoi(p); | |
188 | } | |
189 | ||
8f3a2d54 | 190 | p = lp_exclude_from(i); |
2b6b4d53 | 191 | add_exclude_file(p, 1, 0); |
8f3a2d54 | 192 | |
5805327b | 193 | p = lp_exclude(i); |
8f3a2d54 AT |
194 | add_exclude_line(p); |
195 | ||
1a016bfd AT |
196 | log_open(); |
197 | ||
8638dd48 DD |
198 | if (use_chroot) { |
199 | if (chroot(lp_path(i))) { | |
200 | rprintf(FERROR,"chroot %s failed\n", lp_path(i)); | |
201 | io_printf(fd,"@ERROR: chroot failed\n"); | |
202 | return -1; | |
203 | } | |
3591c066 | 204 | |
8638dd48 DD |
205 | if (chdir("/")) { |
206 | rprintf(FERROR,"chdir %s failed\n", lp_path(i)); | |
207 | io_printf(fd,"@ERROR: chdir failed\n"); | |
208 | return -1; | |
209 | } | |
3591c066 | 210 | |
8638dd48 DD |
211 | if (setgid(gid) || getgid() != gid) { |
212 | rprintf(FERROR,"setgid %d failed\n", gid); | |
213 | io_printf(fd,"@ERROR: setgid failed\n"); | |
214 | return -1; | |
215 | } | |
3591c066 | 216 | |
8638dd48 DD |
217 | if (setuid(uid) || getuid() != uid) { |
218 | rprintf(FERROR,"setuid %d failed\n", uid); | |
219 | io_printf(fd,"@ERROR: setuid failed\n"); | |
220 | return -1; | |
221 | } | |
222 | ||
223 | } else { | |
224 | if (!push_dir(lp_path(i), 0)) { | |
225 | rprintf(FERROR,"chdir %s failed\n", lp_path(i)); | |
226 | io_printf(fd,"@ERROR: chdir failed\n"); | |
227 | return -1; | |
228 | } | |
3591c066 AT |
229 | } |
230 | ||
943882a2 AT |
231 | am_root = (getuid() == 0); |
232 | ||
3591c066 AT |
233 | io_printf(fd,"@RSYNCD: OK\n"); |
234 | ||
235 | argv[argc++] = "rsyncd"; | |
236 | ||
237 | while (1) { | |
238 | if (!read_line(fd, line, sizeof(line)-1)) { | |
239 | return -1; | |
240 | } | |
241 | ||
242 | if (!*line) break; | |
243 | ||
874895d5 AT |
244 | p = line; |
245 | ||
874895d5 | 246 | argv[argc] = strdup(p); |
3591c066 AT |
247 | if (!argv[argc]) { |
248 | return -1; | |
249 | } | |
250 | ||
874895d5 | 251 | if (start_glob) { |
1a016bfd | 252 | if (start_glob == 1) { |
7b372642 | 253 | request = strdup(p); |
1a016bfd AT |
254 | start_glob++; |
255 | } | |
087bf010 | 256 | glob_expand(name, argv, &argc, MAX_ARGS); |
874895d5 AT |
257 | } else { |
258 | argc++; | |
259 | } | |
260 | ||
261 | if (strcmp(line,".") == 0) { | |
262 | start_glob = 1; | |
263 | } | |
264 | ||
3591c066 AT |
265 | if (argc == MAX_ARGS) { |
266 | return -1; | |
267 | } | |
268 | } | |
269 | ||
8638dd48 DD |
270 | if (!use_chroot) { |
271 | /* | |
272 | * Note that this is applied to all parameters, whether or not | |
273 | * they are filenames, but no other legal parameters contain | |
274 | * the forms that need to be sanitized so it doesn't hurt; | |
275 | * it is not known at this point which parameters are files | |
276 | * and which aren't. | |
277 | */ | |
278 | for (i = 1; i < argc; i++) { | |
279 | char *copy = sanitize_path(argv[i]); | |
280 | free((void *)argv[i]); | |
281 | argv[i] = copy; | |
282 | } | |
283 | } | |
284 | ||
41979ff8 | 285 | ret = parse_arguments(argc, argv); |
3591c066 | 286 | |
7b372642 | 287 | if (request) { |
97cb8dc2 | 288 | if (*auth_user) { |
d0d56395 AT |
289 | rprintf(FINFO,"rsync %s %s from %s@%s (%s)\n", |
290 | am_sender?"on":"to", | |
97cb8dc2 | 291 | request, auth_user, host, addr); |
d0d56395 AT |
292 | } else { |
293 | rprintf(FINFO,"rsync %s %s from %s (%s)\n", | |
294 | am_sender?"on":"to", | |
295 | request, host, addr); | |
296 | } | |
7b372642 AT |
297 | free(request); |
298 | } | |
299 | ||
0199b05f | 300 | #if !TRIDGE |
3591c066 AT |
301 | /* don't allow the logs to be flooded too fast */ |
302 | if (verbose > 1) verbose = 1; | |
0199b05f | 303 | #endif |
3591c066 AT |
304 | |
305 | argc -= optind; | |
306 | argp = argv + optind; | |
307 | optind = 0; | |
308 | ||
8d9dc9f9 AT |
309 | if (remote_version > 17 && am_sender) |
310 | io_start_multiplex_out(fd); | |
311 | ||
41979ff8 AT |
312 | if (!ret) { |
313 | rprintf(FERROR,"Error parsing options (unsupported option?) - aborting\n"); | |
65417579 | 314 | exit_cleanup(RERR_SYNTAX); |
41979ff8 AT |
315 | } |
316 | ||
81791cfc AT |
317 | if (lp_timeout(i)) { |
318 | extern int io_timeout; | |
319 | io_timeout = lp_timeout(i); | |
320 | } | |
321 | ||
3591c066 AT |
322 | start_server(fd, fd, argc, argp); |
323 | ||
324 | return 0; | |
325 | } | |
326 | ||
7a6421fa AT |
327 | /* send a list of available modules to the client. Don't list those |
328 | with "list = False". */ | |
3591c066 AT |
329 | static void send_listing(int fd) |
330 | { | |
331 | int n = lp_numservices(); | |
332 | int i; | |
333 | ||
334 | for (i=0;i<n;i++) | |
335 | if (lp_list(i)) | |
336 | io_printf(fd, "%-15s\t%s\n", lp_name(i), lp_comment(i)); | |
337 | } | |
338 | ||
339 | /* this is called when a socket connection is established to a client | |
340 | and we want to start talking. The setup of the system is done from | |
341 | here */ | |
342 | static int start_daemon(int fd) | |
343 | { | |
7a6421fa | 344 | char line[200]; |
3591c066 | 345 | char *motd; |
8ef4ffd6 | 346 | int i = -1; |
4cdf25e4 | 347 | extern char *config_file; |
13c5fc0e | 348 | extern int remote_version; |
4cdf25e4 | 349 | |
f9e940ef | 350 | if (!lp_load(config_file, 0)) { |
65417579 | 351 | exit_cleanup(RERR_SYNTAX); |
4cdf25e4 | 352 | } |
3591c066 AT |
353 | |
354 | set_socket_options(fd,"SO_KEEPALIVE"); | |
a6801c39 AT |
355 | set_socket_options(fd,lp_socket_options()); |
356 | ||
3591c066 AT |
357 | |
358 | io_printf(fd,"@RSYNCD: %d\n", PROTOCOL_VERSION); | |
359 | ||
360 | motd = lp_motd_file(); | |
27d3cdbc | 361 | if (motd && *motd) { |
3591c066 AT |
362 | FILE *f = fopen(motd,"r"); |
363 | while (f && !feof(f)) { | |
364 | int len = fread(line, 1, sizeof(line)-1, f); | |
365 | if (len > 0) { | |
366 | line[len] = 0; | |
367 | io_printf(fd,"%s", line); | |
368 | } | |
369 | } | |
370 | if (f) fclose(f); | |
371 | io_printf(fd,"\n"); | |
372 | } | |
373 | ||
91eee594 AT |
374 | if (!read_line(fd, line, sizeof(line)-1)) { |
375 | return -1; | |
376 | } | |
377 | ||
378 | if (sscanf(line,"@RSYNCD: %d", &remote_version) != 1) { | |
c8e78d87 | 379 | io_printf(fd,"@ERROR: protocol startup error\n"); |
91eee594 AT |
380 | return -1; |
381 | } | |
382 | ||
8ef4ffd6 | 383 | while (i == -1) { |
3591c066 AT |
384 | line[0] = 0; |
385 | if (!read_line(fd, line, sizeof(line)-1)) { | |
386 | return -1; | |
387 | } | |
388 | ||
389 | if (!*line || strcmp(line,"#list")==0) { | |
390 | send_listing(fd); | |
391 | return -1; | |
392 | } | |
393 | ||
394 | if (*line == '#') { | |
395 | /* it's some sort of command that I don't understand */ | |
c8e78d87 | 396 | io_printf(fd,"@ERROR: Unknown command '%s'\n", line); |
3591c066 AT |
397 | return -1; |
398 | } | |
399 | ||
400 | i = lp_number(line); | |
401 | if (i == -1) { | |
c8e78d87 | 402 | io_printf(fd,"@ERROR: Unknown module '%s'\n", line); |
3591c066 AT |
403 | return -1; |
404 | } | |
3591c066 AT |
405 | } |
406 | ||
8ef4ffd6 | 407 | return rsync_module(fd, i); |
3591c066 AT |
408 | } |
409 | ||
410 | ||
411 | int daemon_main(void) | |
412 | { | |
f9e940ef | 413 | extern char *config_file; |
8638dd48 | 414 | char *pid_file; |
1a016bfd | 415 | |
5243c216 AT |
416 | /* this ensures that we don't call getcwd after the chroot, |
417 | which doesn't work on platforms that use popen("pwd","r") | |
418 | for getcwd */ | |
419 | push_dir("/", 0); | |
420 | ||
3591c066 | 421 | if (is_a_socket(STDIN_FILENO)) { |
41979ff8 AT |
422 | int i; |
423 | ||
424 | /* we are running via inetd - close off stdout and | |
425 | stderr so that library functions (and getopt) don't | |
426 | try to use them. Redirect them to /dev/null */ | |
427 | for (i=1;i<3;i++) { | |
428 | close(i); | |
429 | open("/dev/null", O_RDWR); | |
430 | } | |
3eb38818 AT |
431 | |
432 | set_nonblocking(STDIN_FILENO); | |
433 | ||
3591c066 AT |
434 | return start_daemon(STDIN_FILENO); |
435 | } | |
436 | ||
437 | become_daemon(); | |
438 | ||
f9e940ef AT |
439 | if (!lp_load(config_file, 1)) { |
440 | fprintf(stderr,"failed to load config file %s\n", config_file); | |
65417579 | 441 | exit_cleanup(RERR_SYNTAX); |
f9e940ef AT |
442 | } |
443 | ||
444 | log_open(); | |
445 | ||
e42c9458 AT |
446 | rprintf(FINFO,"rsyncd version %s starting\n",VERSION); |
447 | ||
8638dd48 DD |
448 | if (((pid_file = lp_pid_file()) != NULL) && (*pid_file != '\0')) { |
449 | FILE *f; | |
450 | int pid = (int) getpid(); | |
451 | cleanup_set_pid(pid); | |
452 | if ((f = fopen(lp_pid_file(), "w")) == NULL) { | |
453 | cleanup_set_pid(0); | |
454 | fprintf(stderr,"failed to create pid file %s\n", pid_file); | |
65417579 | 455 | exit_cleanup(RERR_FILEIO); |
8638dd48 DD |
456 | } |
457 | fprintf(f, "%d\n", pid); | |
458 | fclose(f); | |
459 | } | |
460 | ||
8ef4ffd6 AT |
461 | start_accept_loop(rsync_port, start_daemon); |
462 | return -1; | |
3591c066 AT |
463 | } |
464 |