Commit | Line | Data |
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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; | |
27 | ||
28 | int start_socket_client(char *host, char *path, int argc, char *argv[]) | |
29 | { | |
30 | int fd, i; | |
31 | char *sargs[MAX_ARGS]; | |
32 | int sargc=0; | |
e42c9458 | 33 | char line[MAXPATHLEN]; |
bcb7e502 | 34 | char *p, *user=NULL; |
13c5fc0e | 35 | extern int remote_version; |
3591c066 | 36 | |
bcb7e502 AT |
37 | p = strchr(host, '@'); |
38 | if (p) { | |
39 | user = host; | |
40 | host = p+1; | |
41 | *p = 0; | |
42 | } | |
43 | ||
44 | if (!user) user = getenv("USER"); | |
45 | if (!user) user = getenv("LOGNAME"); | |
46 | ||
3591c066 AT |
47 | fd = open_socket_out(host, rsync_port); |
48 | if (fd == -1) { | |
49 | exit_cleanup(1); | |
50 | } | |
51 | ||
52 | server_options(sargs,&sargc); | |
53 | ||
54 | sargs[sargc++] = "."; | |
55 | ||
56 | if (path && *path) | |
57 | sargs[sargc++] = path; | |
58 | ||
59 | sargs[sargc] = NULL; | |
60 | ||
91eee594 AT |
61 | io_printf(fd,"@RSYNCD: %d\n", PROTOCOL_VERSION); |
62 | ||
3591c066 AT |
63 | if (!read_line(fd, line, sizeof(line)-1)) { |
64 | return -1; | |
65 | } | |
66 | ||
13c5fc0e | 67 | if (sscanf(line,"@RSYNCD: %d", &remote_version) != 1) { |
3591c066 AT |
68 | return -1; |
69 | } | |
70 | ||
2c91d3d3 AT |
71 | p = strchr(path,'/'); |
72 | if (p) *p = 0; | |
73 | io_printf(fd,"%s\n",path); | |
74 | if (p) *p = '/'; | |
75 | ||
3591c066 AT |
76 | while (1) { |
77 | if (!read_line(fd, line, sizeof(line)-1)) { | |
78 | return -1; | |
79 | } | |
31593dd6 | 80 | |
31593dd6 | 81 | if (strncmp(line,"@RSYNCD: AUTHREQD ",18) == 0) { |
bcb7e502 | 82 | auth_client(fd, user, line+18); |
31593dd6 AT |
83 | continue; |
84 | } | |
31593dd6 | 85 | |
3591c066 AT |
86 | if (strcmp(line,"@RSYNCD: OK") == 0) break; |
87 | rprintf(FINFO,"%s\n", line); | |
88 | } | |
89 | ||
90 | for (i=0;i<sargc;i++) { | |
91 | io_printf(fd,"%s\n", sargs[i]); | |
92 | } | |
93 | io_printf(fd,"\n"); | |
94 | ||
3591c066 AT |
95 | return client_run(fd, fd, -1, argc, argv); |
96 | } | |
97 | ||
98 | ||
99 | ||
100 | static int rsync_module(int fd, int i) | |
101 | { | |
102 | int argc=0; | |
103 | char *argv[MAX_ARGS]; | |
104 | char **argp; | |
e42c9458 | 105 | char line[MAXPATHLEN]; |
1a016bfd AT |
106 | uid_t uid = (uid_t)-2; |
107 | gid_t gid = (gid_t)-2; | |
8ef4ffd6 | 108 | char *p; |
56c473b7 AT |
109 | char *addr = client_addr(fd); |
110 | char *host = client_name(fd); | |
874895d5 | 111 | char *name = lp_name(i); |
d0d56395 | 112 | char *user; |
874895d5 | 113 | int start_glob=0; |
7b372642 AT |
114 | char *request=NULL; |
115 | extern int am_sender; | |
56c473b7 AT |
116 | |
117 | if (!allow_access(addr, host, lp_hosts_allow(i), lp_hosts_deny(i))) { | |
118 | rprintf(FERROR,"rsync denied on module %s from %s (%s)\n", | |
874895d5 | 119 | name, client_name(fd), client_addr(fd)); |
c8e78d87 | 120 | io_printf(fd,"@ERROR: access denied to %s from %s (%s)\n", |
874895d5 | 121 | name, client_name(fd), client_addr(fd)); |
56c473b7 AT |
122 | return -1; |
123 | } | |
3591c066 | 124 | |
0c515f17 | 125 | if (!claim_connection(lp_lock_file(), lp_max_connections())) { |
c8e78d87 AT |
126 | rprintf(FERROR,"max connections (%d) reached\n", |
127 | lp_max_connections()); | |
128 | io_printf(fd,"@ERROR: max connections (%d) reached - try again later\n", lp_max_connections()); | |
0c515f17 AT |
129 | return -1; |
130 | } | |
131 | ||
31593dd6 | 132 | |
d0d56395 AT |
133 | user = auth_server(fd, i, addr, "@RSYNCD: AUTHREQD "); |
134 | ||
135 | if (!user) { | |
136 | rprintf(FERROR,"auth failed on module %s from %s (%s)\n", | |
137 | name, client_name(fd), client_addr(fd)); | |
138 | io_printf(fd,"@ERROR: auth failed on module %s\n",name); | |
139 | return -1; | |
140 | } | |
141 | ||
3591c066 AT |
142 | module_id = i; |
143 | ||
144 | if (lp_read_only(i)) | |
145 | read_only = 1; | |
146 | ||
8ef4ffd6 AT |
147 | p = lp_uid(i); |
148 | if (!name_to_uid(p, &uid)) { | |
149 | if (!isdigit(*p)) { | |
150 | rprintf(FERROR,"Invalid uid %s\n", p); | |
c8e78d87 | 151 | io_printf(fd,"@ERROR: invalid uid\n"); |
8ef4ffd6 AT |
152 | return -1; |
153 | } | |
154 | uid = atoi(p); | |
155 | } | |
156 | ||
157 | p = lp_gid(i); | |
158 | if (!name_to_gid(p, &gid)) { | |
159 | if (!isdigit(*p)) { | |
160 | rprintf(FERROR,"Invalid gid %s\n", p); | |
c8e78d87 | 161 | io_printf(fd,"@ERROR: invalid gid\n"); |
8ef4ffd6 AT |
162 | return -1; |
163 | } | |
164 | gid = atoi(p); | |
165 | } | |
166 | ||
8f3a2d54 AT |
167 | p = lp_exclude_from(i); |
168 | add_exclude_file(p, 1); | |
169 | ||
5805327b | 170 | p = lp_exclude(i); |
8f3a2d54 AT |
171 | add_exclude_line(p); |
172 | ||
1a016bfd AT |
173 | log_open(); |
174 | ||
3591c066 | 175 | if (chroot(lp_path(i))) { |
1a016bfd | 176 | rprintf(FERROR,"chroot %s failed\n", lp_path(i)); |
3591c066 AT |
177 | io_printf(fd,"@ERROR: chroot failed\n"); |
178 | return -1; | |
179 | } | |
180 | ||
181 | if (chdir("/")) { | |
1a016bfd | 182 | rprintf(FERROR,"chdir %s failed\n", lp_path(i)); |
3591c066 AT |
183 | io_printf(fd,"@ERROR: chdir failed\n"); |
184 | return -1; | |
185 | } | |
186 | ||
1a016bfd AT |
187 | if (setgid(gid) || getgid() != gid) { |
188 | rprintf(FERROR,"setgid %d failed\n", gid); | |
3591c066 AT |
189 | io_printf(fd,"@ERROR: setgid failed\n"); |
190 | return -1; | |
191 | } | |
192 | ||
1a016bfd AT |
193 | if (setuid(uid) || getuid() != uid) { |
194 | rprintf(FERROR,"setuid %d failed\n", uid); | |
3591c066 AT |
195 | io_printf(fd,"@ERROR: setuid failed\n"); |
196 | return -1; | |
197 | } | |
198 | ||
199 | io_printf(fd,"@RSYNCD: OK\n"); | |
200 | ||
201 | argv[argc++] = "rsyncd"; | |
202 | ||
203 | while (1) { | |
204 | if (!read_line(fd, line, sizeof(line)-1)) { | |
205 | return -1; | |
206 | } | |
207 | ||
208 | if (!*line) break; | |
209 | ||
874895d5 AT |
210 | p = line; |
211 | ||
874895d5 | 212 | argv[argc] = strdup(p); |
3591c066 AT |
213 | if (!argv[argc]) { |
214 | return -1; | |
215 | } | |
216 | ||
874895d5 | 217 | if (start_glob) { |
1a016bfd | 218 | if (start_glob == 1) { |
7b372642 | 219 | request = strdup(p); |
1a016bfd AT |
220 | start_glob++; |
221 | } | |
087bf010 | 222 | glob_expand(name, argv, &argc, MAX_ARGS); |
874895d5 AT |
223 | } else { |
224 | argc++; | |
225 | } | |
226 | ||
227 | if (strcmp(line,".") == 0) { | |
228 | start_glob = 1; | |
229 | } | |
230 | ||
3591c066 AT |
231 | if (argc == MAX_ARGS) { |
232 | return -1; | |
233 | } | |
234 | } | |
235 | ||
236 | parse_arguments(argc, argv); | |
237 | ||
7b372642 | 238 | if (request) { |
d0d56395 AT |
239 | if (*user) { |
240 | rprintf(FINFO,"rsync %s %s from %s@%s (%s)\n", | |
241 | am_sender?"on":"to", | |
242 | request, user, host, addr); | |
243 | } else { | |
244 | rprintf(FINFO,"rsync %s %s from %s (%s)\n", | |
245 | am_sender?"on":"to", | |
246 | request, host, addr); | |
247 | } | |
7b372642 AT |
248 | free(request); |
249 | } | |
250 | ||
3591c066 AT |
251 | /* don't allow the logs to be flooded too fast */ |
252 | if (verbose > 1) verbose = 1; | |
253 | ||
254 | argc -= optind; | |
255 | argp = argv + optind; | |
256 | optind = 0; | |
257 | ||
258 | start_server(fd, fd, argc, argp); | |
259 | ||
260 | return 0; | |
261 | } | |
262 | ||
7a6421fa AT |
263 | /* send a list of available modules to the client. Don't list those |
264 | with "list = False". */ | |
3591c066 AT |
265 | static void send_listing(int fd) |
266 | { | |
267 | int n = lp_numservices(); | |
268 | int i; | |
269 | ||
270 | for (i=0;i<n;i++) | |
271 | if (lp_list(i)) | |
272 | io_printf(fd, "%-15s\t%s\n", lp_name(i), lp_comment(i)); | |
273 | } | |
274 | ||
275 | /* this is called when a socket connection is established to a client | |
276 | and we want to start talking. The setup of the system is done from | |
277 | here */ | |
278 | static int start_daemon(int fd) | |
279 | { | |
7a6421fa | 280 | char line[200]; |
3591c066 | 281 | char *motd; |
8ef4ffd6 | 282 | int i = -1; |
4cdf25e4 | 283 | extern char *config_file; |
13c5fc0e | 284 | extern int remote_version; |
4cdf25e4 | 285 | |
f9e940ef | 286 | if (!lp_load(config_file, 0)) { |
4cdf25e4 AT |
287 | exit_cleanup(1); |
288 | } | |
3591c066 AT |
289 | |
290 | set_socket_options(fd,"SO_KEEPALIVE"); | |
a6801c39 AT |
291 | set_socket_options(fd,lp_socket_options()); |
292 | ||
3591c066 AT |
293 | |
294 | io_printf(fd,"@RSYNCD: %d\n", PROTOCOL_VERSION); | |
295 | ||
296 | motd = lp_motd_file(); | |
297 | if (*motd) { | |
298 | FILE *f = fopen(motd,"r"); | |
299 | while (f && !feof(f)) { | |
300 | int len = fread(line, 1, sizeof(line)-1, f); | |
301 | if (len > 0) { | |
302 | line[len] = 0; | |
303 | io_printf(fd,"%s", line); | |
304 | } | |
305 | } | |
306 | if (f) fclose(f); | |
307 | io_printf(fd,"\n"); | |
308 | } | |
309 | ||
91eee594 AT |
310 | if (!read_line(fd, line, sizeof(line)-1)) { |
311 | return -1; | |
312 | } | |
313 | ||
314 | if (sscanf(line,"@RSYNCD: %d", &remote_version) != 1) { | |
c8e78d87 | 315 | io_printf(fd,"@ERROR: protocol startup error\n"); |
91eee594 AT |
316 | return -1; |
317 | } | |
318 | ||
8ef4ffd6 | 319 | while (i == -1) { |
3591c066 AT |
320 | line[0] = 0; |
321 | if (!read_line(fd, line, sizeof(line)-1)) { | |
322 | return -1; | |
323 | } | |
324 | ||
325 | if (!*line || strcmp(line,"#list")==0) { | |
326 | send_listing(fd); | |
327 | return -1; | |
328 | } | |
329 | ||
330 | if (*line == '#') { | |
331 | /* it's some sort of command that I don't understand */ | |
c8e78d87 | 332 | io_printf(fd,"@ERROR: Unknown command '%s'\n", line); |
3591c066 AT |
333 | return -1; |
334 | } | |
335 | ||
336 | i = lp_number(line); | |
337 | if (i == -1) { | |
c8e78d87 | 338 | io_printf(fd,"@ERROR: Unknown module '%s'\n", line); |
3591c066 AT |
339 | return -1; |
340 | } | |
3591c066 AT |
341 | } |
342 | ||
8ef4ffd6 | 343 | return rsync_module(fd, i); |
3591c066 AT |
344 | } |
345 | ||
346 | ||
347 | int daemon_main(void) | |
348 | { | |
f9e940ef | 349 | extern char *config_file; |
1a016bfd | 350 | |
3591c066 AT |
351 | if (is_a_socket(STDIN_FILENO)) { |
352 | /* we are running via inetd */ | |
353 | return start_daemon(STDIN_FILENO); | |
354 | } | |
355 | ||
356 | become_daemon(); | |
357 | ||
f9e940ef AT |
358 | if (!lp_load(config_file, 1)) { |
359 | fprintf(stderr,"failed to load config file %s\n", config_file); | |
360 | exit_cleanup(1); | |
361 | } | |
362 | ||
363 | log_open(); | |
364 | ||
e42c9458 AT |
365 | rprintf(FINFO,"rsyncd version %s starting\n",VERSION); |
366 | ||
8ef4ffd6 AT |
367 | start_accept_loop(rsync_port, start_daemon); |
368 | return -1; | |
3591c066 AT |
369 | } |
370 |