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; |
8d9dc9f9 AT |
36 | extern int am_client; |
37 | extern int am_sender; | |
3591c066 | 38 | |
bcb7e502 AT |
39 | p = strchr(host, '@'); |
40 | if (p) { | |
41 | user = host; | |
42 | host = p+1; | |
43 | *p = 0; | |
44 | } | |
45 | ||
46 | if (!user) user = getenv("USER"); | |
47 | if (!user) user = getenv("LOGNAME"); | |
48 | ||
8d9dc9f9 AT |
49 | am_client = 1; |
50 | ||
3591c066 AT |
51 | fd = open_socket_out(host, rsync_port); |
52 | if (fd == -1) { | |
53 | exit_cleanup(1); | |
54 | } | |
55 | ||
56 | server_options(sargs,&sargc); | |
57 | ||
58 | sargs[sargc++] = "."; | |
59 | ||
60 | if (path && *path) | |
61 | sargs[sargc++] = path; | |
62 | ||
63 | sargs[sargc] = NULL; | |
64 | ||
91eee594 AT |
65 | io_printf(fd,"@RSYNCD: %d\n", PROTOCOL_VERSION); |
66 | ||
3591c066 AT |
67 | if (!read_line(fd, line, sizeof(line)-1)) { |
68 | return -1; | |
69 | } | |
70 | ||
13c5fc0e | 71 | if (sscanf(line,"@RSYNCD: %d", &remote_version) != 1) { |
3591c066 AT |
72 | return -1; |
73 | } | |
74 | ||
2c91d3d3 AT |
75 | p = strchr(path,'/'); |
76 | if (p) *p = 0; | |
77 | io_printf(fd,"%s\n",path); | |
78 | if (p) *p = '/'; | |
79 | ||
3591c066 AT |
80 | while (1) { |
81 | if (!read_line(fd, line, sizeof(line)-1)) { | |
82 | return -1; | |
83 | } | |
31593dd6 | 84 | |
31593dd6 | 85 | if (strncmp(line,"@RSYNCD: AUTHREQD ",18) == 0) { |
bcb7e502 | 86 | auth_client(fd, user, line+18); |
31593dd6 AT |
87 | continue; |
88 | } | |
31593dd6 | 89 | |
3591c066 AT |
90 | if (strcmp(line,"@RSYNCD: OK") == 0) break; |
91 | rprintf(FINFO,"%s\n", line); | |
92 | } | |
93 | ||
94 | for (i=0;i<sargc;i++) { | |
95 | io_printf(fd,"%s\n", sargs[i]); | |
96 | } | |
97 | io_printf(fd,"\n"); | |
98 | ||
8d9dc9f9 AT |
99 | if (remote_version > 17 && !am_sender) |
100 | io_start_multiplex_in(fd); | |
101 | ||
3591c066 AT |
102 | return client_run(fd, fd, -1, argc, argv); |
103 | } | |
104 | ||
105 | ||
106 | ||
107 | static int rsync_module(int fd, int i) | |
108 | { | |
109 | int argc=0; | |
110 | char *argv[MAX_ARGS]; | |
111 | char **argp; | |
e42c9458 | 112 | char line[MAXPATHLEN]; |
1a016bfd AT |
113 | uid_t uid = (uid_t)-2; |
114 | gid_t gid = (gid_t)-2; | |
8ef4ffd6 | 115 | char *p; |
56c473b7 AT |
116 | char *addr = client_addr(fd); |
117 | char *host = client_name(fd); | |
874895d5 | 118 | char *name = lp_name(i); |
d0d56395 | 119 | char *user; |
874895d5 | 120 | int start_glob=0; |
7b372642 AT |
121 | char *request=NULL; |
122 | extern int am_sender; | |
8d9dc9f9 | 123 | extern int remote_version; |
56c473b7 AT |
124 | |
125 | if (!allow_access(addr, host, lp_hosts_allow(i), lp_hosts_deny(i))) { | |
126 | rprintf(FERROR,"rsync denied on module %s from %s (%s)\n", | |
874895d5 | 127 | name, client_name(fd), client_addr(fd)); |
c8e78d87 | 128 | io_printf(fd,"@ERROR: access denied to %s from %s (%s)\n", |
874895d5 | 129 | name, client_name(fd), client_addr(fd)); |
56c473b7 AT |
130 | return -1; |
131 | } | |
3591c066 | 132 | |
0c515f17 | 133 | if (!claim_connection(lp_lock_file(), lp_max_connections())) { |
c8e78d87 AT |
134 | rprintf(FERROR,"max connections (%d) reached\n", |
135 | lp_max_connections()); | |
136 | io_printf(fd,"@ERROR: max connections (%d) reached - try again later\n", lp_max_connections()); | |
0c515f17 AT |
137 | return -1; |
138 | } | |
139 | ||
31593dd6 | 140 | |
d0d56395 AT |
141 | user = auth_server(fd, i, addr, "@RSYNCD: AUTHREQD "); |
142 | ||
143 | if (!user) { | |
144 | rprintf(FERROR,"auth failed on module %s from %s (%s)\n", | |
145 | name, client_name(fd), client_addr(fd)); | |
146 | io_printf(fd,"@ERROR: auth failed on module %s\n",name); | |
147 | return -1; | |
148 | } | |
149 | ||
3591c066 AT |
150 | module_id = i; |
151 | ||
152 | if (lp_read_only(i)) | |
153 | read_only = 1; | |
154 | ||
8ef4ffd6 AT |
155 | p = lp_uid(i); |
156 | if (!name_to_uid(p, &uid)) { | |
157 | if (!isdigit(*p)) { | |
158 | rprintf(FERROR,"Invalid uid %s\n", p); | |
c8e78d87 | 159 | io_printf(fd,"@ERROR: invalid uid\n"); |
8ef4ffd6 AT |
160 | return -1; |
161 | } | |
162 | uid = atoi(p); | |
163 | } | |
164 | ||
165 | p = lp_gid(i); | |
166 | if (!name_to_gid(p, &gid)) { | |
167 | if (!isdigit(*p)) { | |
168 | rprintf(FERROR,"Invalid gid %s\n", p); | |
c8e78d87 | 169 | io_printf(fd,"@ERROR: invalid gid\n"); |
8ef4ffd6 AT |
170 | return -1; |
171 | } | |
172 | gid = atoi(p); | |
173 | } | |
174 | ||
8f3a2d54 AT |
175 | p = lp_exclude_from(i); |
176 | add_exclude_file(p, 1); | |
177 | ||
5805327b | 178 | p = lp_exclude(i); |
8f3a2d54 AT |
179 | add_exclude_line(p); |
180 | ||
1a016bfd AT |
181 | log_open(); |
182 | ||
3591c066 | 183 | if (chroot(lp_path(i))) { |
1a016bfd | 184 | rprintf(FERROR,"chroot %s failed\n", lp_path(i)); |
3591c066 AT |
185 | io_printf(fd,"@ERROR: chroot failed\n"); |
186 | return -1; | |
187 | } | |
188 | ||
189 | if (chdir("/")) { | |
1a016bfd | 190 | rprintf(FERROR,"chdir %s failed\n", lp_path(i)); |
3591c066 AT |
191 | io_printf(fd,"@ERROR: chdir failed\n"); |
192 | return -1; | |
193 | } | |
194 | ||
1a016bfd AT |
195 | if (setgid(gid) || getgid() != gid) { |
196 | rprintf(FERROR,"setgid %d failed\n", gid); | |
3591c066 AT |
197 | io_printf(fd,"@ERROR: setgid failed\n"); |
198 | return -1; | |
199 | } | |
200 | ||
1a016bfd AT |
201 | if (setuid(uid) || getuid() != uid) { |
202 | rprintf(FERROR,"setuid %d failed\n", uid); | |
3591c066 AT |
203 | io_printf(fd,"@ERROR: setuid failed\n"); |
204 | return -1; | |
205 | } | |
206 | ||
207 | io_printf(fd,"@RSYNCD: OK\n"); | |
208 | ||
209 | argv[argc++] = "rsyncd"; | |
210 | ||
211 | while (1) { | |
212 | if (!read_line(fd, line, sizeof(line)-1)) { | |
213 | return -1; | |
214 | } | |
215 | ||
216 | if (!*line) break; | |
217 | ||
874895d5 AT |
218 | p = line; |
219 | ||
874895d5 | 220 | argv[argc] = strdup(p); |
3591c066 AT |
221 | if (!argv[argc]) { |
222 | return -1; | |
223 | } | |
224 | ||
874895d5 | 225 | if (start_glob) { |
1a016bfd | 226 | if (start_glob == 1) { |
7b372642 | 227 | request = strdup(p); |
1a016bfd AT |
228 | start_glob++; |
229 | } | |
087bf010 | 230 | glob_expand(name, argv, &argc, MAX_ARGS); |
874895d5 AT |
231 | } else { |
232 | argc++; | |
233 | } | |
234 | ||
235 | if (strcmp(line,".") == 0) { | |
236 | start_glob = 1; | |
237 | } | |
238 | ||
3591c066 AT |
239 | if (argc == MAX_ARGS) { |
240 | return -1; | |
241 | } | |
242 | } | |
243 | ||
244 | parse_arguments(argc, argv); | |
245 | ||
7b372642 | 246 | if (request) { |
d0d56395 AT |
247 | if (*user) { |
248 | rprintf(FINFO,"rsync %s %s from %s@%s (%s)\n", | |
249 | am_sender?"on":"to", | |
250 | request, user, host, addr); | |
251 | } else { | |
252 | rprintf(FINFO,"rsync %s %s from %s (%s)\n", | |
253 | am_sender?"on":"to", | |
254 | request, host, addr); | |
255 | } | |
7b372642 AT |
256 | free(request); |
257 | } | |
258 | ||
3591c066 AT |
259 | /* don't allow the logs to be flooded too fast */ |
260 | if (verbose > 1) verbose = 1; | |
261 | ||
262 | argc -= optind; | |
263 | argp = argv + optind; | |
264 | optind = 0; | |
265 | ||
8d9dc9f9 AT |
266 | if (remote_version > 17 && am_sender) |
267 | io_start_multiplex_out(fd); | |
268 | ||
3591c066 AT |
269 | start_server(fd, fd, argc, argp); |
270 | ||
271 | return 0; | |
272 | } | |
273 | ||
7a6421fa AT |
274 | /* send a list of available modules to the client. Don't list those |
275 | with "list = False". */ | |
3591c066 AT |
276 | static void send_listing(int fd) |
277 | { | |
278 | int n = lp_numservices(); | |
279 | int i; | |
280 | ||
281 | for (i=0;i<n;i++) | |
282 | if (lp_list(i)) | |
283 | io_printf(fd, "%-15s\t%s\n", lp_name(i), lp_comment(i)); | |
284 | } | |
285 | ||
286 | /* this is called when a socket connection is established to a client | |
287 | and we want to start talking. The setup of the system is done from | |
288 | here */ | |
289 | static int start_daemon(int fd) | |
290 | { | |
7a6421fa | 291 | char line[200]; |
3591c066 | 292 | char *motd; |
8ef4ffd6 | 293 | int i = -1; |
4cdf25e4 | 294 | extern char *config_file; |
13c5fc0e | 295 | extern int remote_version; |
4cdf25e4 | 296 | |
f9e940ef | 297 | if (!lp_load(config_file, 0)) { |
4cdf25e4 AT |
298 | exit_cleanup(1); |
299 | } | |
3591c066 AT |
300 | |
301 | set_socket_options(fd,"SO_KEEPALIVE"); | |
a6801c39 AT |
302 | set_socket_options(fd,lp_socket_options()); |
303 | ||
3591c066 AT |
304 | |
305 | io_printf(fd,"@RSYNCD: %d\n", PROTOCOL_VERSION); | |
306 | ||
307 | motd = lp_motd_file(); | |
308 | if (*motd) { | |
309 | FILE *f = fopen(motd,"r"); | |
310 | while (f && !feof(f)) { | |
311 | int len = fread(line, 1, sizeof(line)-1, f); | |
312 | if (len > 0) { | |
313 | line[len] = 0; | |
314 | io_printf(fd,"%s", line); | |
315 | } | |
316 | } | |
317 | if (f) fclose(f); | |
318 | io_printf(fd,"\n"); | |
319 | } | |
320 | ||
91eee594 AT |
321 | if (!read_line(fd, line, sizeof(line)-1)) { |
322 | return -1; | |
323 | } | |
324 | ||
325 | if (sscanf(line,"@RSYNCD: %d", &remote_version) != 1) { | |
c8e78d87 | 326 | io_printf(fd,"@ERROR: protocol startup error\n"); |
91eee594 AT |
327 | return -1; |
328 | } | |
329 | ||
8ef4ffd6 | 330 | while (i == -1) { |
3591c066 AT |
331 | line[0] = 0; |
332 | if (!read_line(fd, line, sizeof(line)-1)) { | |
333 | return -1; | |
334 | } | |
335 | ||
336 | if (!*line || strcmp(line,"#list")==0) { | |
337 | send_listing(fd); | |
338 | return -1; | |
339 | } | |
340 | ||
341 | if (*line == '#') { | |
342 | /* it's some sort of command that I don't understand */ | |
c8e78d87 | 343 | io_printf(fd,"@ERROR: Unknown command '%s'\n", line); |
3591c066 AT |
344 | return -1; |
345 | } | |
346 | ||
347 | i = lp_number(line); | |
348 | if (i == -1) { | |
c8e78d87 | 349 | io_printf(fd,"@ERROR: Unknown module '%s'\n", line); |
3591c066 AT |
350 | return -1; |
351 | } | |
3591c066 AT |
352 | } |
353 | ||
8ef4ffd6 | 354 | return rsync_module(fd, i); |
3591c066 AT |
355 | } |
356 | ||
357 | ||
358 | int daemon_main(void) | |
359 | { | |
f9e940ef | 360 | extern char *config_file; |
1a016bfd | 361 | |
3591c066 AT |
362 | if (is_a_socket(STDIN_FILENO)) { |
363 | /* we are running via inetd */ | |
364 | return start_daemon(STDIN_FILENO); | |
365 | } | |
366 | ||
367 | become_daemon(); | |
368 | ||
f9e940ef AT |
369 | if (!lp_load(config_file, 1)) { |
370 | fprintf(stderr,"failed to load config file %s\n", config_file); | |
371 | exit_cleanup(1); | |
372 | } | |
373 | ||
374 | log_open(); | |
375 | ||
e42c9458 AT |
376 | rprintf(FINFO,"rsyncd version %s starting\n",VERSION); |
377 | ||
8ef4ffd6 AT |
378 | start_accept_loop(rsync_port, start_daemon); |
379 | return -1; | |
3591c066 AT |
380 | } |
381 |