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; | |
33 | char line[1024]; | |
34 | char *p; | |
13c5fc0e | 35 | extern int remote_version; |
3591c066 AT |
36 | |
37 | fd = open_socket_out(host, rsync_port); | |
38 | if (fd == -1) { | |
39 | exit_cleanup(1); | |
40 | } | |
41 | ||
42 | server_options(sargs,&sargc); | |
43 | ||
44 | sargs[sargc++] = "."; | |
45 | ||
46 | if (path && *path) | |
47 | sargs[sargc++] = path; | |
48 | ||
49 | sargs[sargc] = NULL; | |
50 | ||
91eee594 AT |
51 | io_printf(fd,"@RSYNCD: %d\n", PROTOCOL_VERSION); |
52 | ||
3591c066 AT |
53 | if (!read_line(fd, line, sizeof(line)-1)) { |
54 | return -1; | |
55 | } | |
56 | ||
13c5fc0e | 57 | if (sscanf(line,"@RSYNCD: %d", &remote_version) != 1) { |
3591c066 AT |
58 | return -1; |
59 | } | |
60 | ||
2c91d3d3 AT |
61 | p = strchr(path,'/'); |
62 | if (p) *p = 0; | |
63 | io_printf(fd,"%s\n",path); | |
64 | if (p) *p = '/'; | |
65 | ||
3591c066 AT |
66 | while (1) { |
67 | if (!read_line(fd, line, sizeof(line)-1)) { | |
68 | return -1; | |
69 | } | |
31593dd6 AT |
70 | |
71 | #if 0 | |
72 | if (strncmp(line,"@RSYNCD: AUTHREQD ",18) == 0) { | |
73 | auth_client(fd, line+18); | |
74 | continue; | |
75 | } | |
76 | #endif | |
77 | ||
3591c066 AT |
78 | if (strcmp(line,"@RSYNCD: OK") == 0) break; |
79 | rprintf(FINFO,"%s\n", line); | |
80 | } | |
81 | ||
82 | for (i=0;i<sargc;i++) { | |
83 | io_printf(fd,"%s\n", sargs[i]); | |
84 | } | |
85 | io_printf(fd,"\n"); | |
86 | ||
87 | #if 0 | |
88 | while (1) { | |
89 | if (!read_line(fd, line, sizeof(line)-1)) { | |
90 | return -1; | |
91 | } | |
92 | rprintf(FINFO,"%s\n", line); | |
93 | } | |
94 | #endif | |
95 | ||
96 | return client_run(fd, fd, -1, argc, argv); | |
97 | } | |
98 | ||
99 | ||
100 | ||
101 | static int rsync_module(int fd, int i) | |
102 | { | |
103 | int argc=0; | |
104 | char *argv[MAX_ARGS]; | |
105 | char **argp; | |
106 | char line[1024]; | |
8ef4ffd6 AT |
107 | uid_t uid; |
108 | gid_t gid; | |
109 | char *p; | |
56c473b7 AT |
110 | char *addr = client_addr(fd); |
111 | char *host = client_name(fd); | |
31593dd6 | 112 | char *auth; |
56c473b7 AT |
113 | |
114 | if (!allow_access(addr, host, lp_hosts_allow(i), lp_hosts_deny(i))) { | |
115 | rprintf(FERROR,"rsync denied on module %s from %s (%s)\n", | |
116 | lp_name(i), client_name(fd), client_addr(fd)); | |
117 | return -1; | |
118 | } | |
3591c066 | 119 | |
31593dd6 AT |
120 | #if 0 |
121 | if (!auth_server(fd, "@RSYNCD: AUTHREQD ")) { | |
122 | rprintf(FERROR,"auth failed on module %s from %s (%s)\n", | |
123 | lp_name(i), client_name(fd), client_addr(fd)); | |
124 | return -1; | |
125 | } | |
126 | #endif | |
127 | ||
0c515f17 AT |
128 | if (!claim_connection(lp_lock_file(), lp_max_connections())) { |
129 | rprintf(FERROR,"ERROR: max connections reached\n"); | |
130 | return -1; | |
131 | } | |
132 | ||
ff8b29b8 | 133 | rprintf(FINFO,"rsync on module %s from %s (%s)\n", |
56c473b7 | 134 | lp_name(i), host, addr); |
31593dd6 | 135 | |
3591c066 AT |
136 | module_id = i; |
137 | ||
138 | if (lp_read_only(i)) | |
139 | read_only = 1; | |
140 | ||
8ef4ffd6 AT |
141 | p = lp_uid(i); |
142 | if (!name_to_uid(p, &uid)) { | |
143 | if (!isdigit(*p)) { | |
144 | rprintf(FERROR,"Invalid uid %s\n", p); | |
145 | return -1; | |
146 | } | |
147 | uid = atoi(p); | |
148 | } | |
149 | ||
150 | p = lp_gid(i); | |
151 | if (!name_to_gid(p, &gid)) { | |
152 | if (!isdigit(*p)) { | |
153 | rprintf(FERROR,"Invalid gid %s\n", p); | |
154 | return -1; | |
155 | } | |
156 | gid = atoi(p); | |
157 | } | |
158 | ||
3591c066 AT |
159 | if (chroot(lp_path(i))) { |
160 | io_printf(fd,"@ERROR: chroot failed\n"); | |
161 | return -1; | |
162 | } | |
163 | ||
164 | if (chdir("/")) { | |
165 | io_printf(fd,"@ERROR: chdir failed\n"); | |
166 | return -1; | |
167 | } | |
168 | ||
8ef4ffd6 | 169 | if (setgid(gid)) { |
3591c066 AT |
170 | io_printf(fd,"@ERROR: setgid failed\n"); |
171 | return -1; | |
172 | } | |
173 | ||
8ef4ffd6 | 174 | if (setuid(uid)) { |
3591c066 AT |
175 | io_printf(fd,"@ERROR: setuid failed\n"); |
176 | return -1; | |
177 | } | |
178 | ||
179 | io_printf(fd,"@RSYNCD: OK\n"); | |
180 | ||
181 | argv[argc++] = "rsyncd"; | |
182 | ||
183 | while (1) { | |
184 | if (!read_line(fd, line, sizeof(line)-1)) { | |
185 | return -1; | |
186 | } | |
187 | ||
188 | if (!*line) break; | |
189 | ||
190 | argv[argc] = strdup(line); | |
191 | if (!argv[argc]) { | |
192 | return -1; | |
193 | } | |
194 | ||
195 | argc++; | |
196 | if (argc == MAX_ARGS) { | |
197 | return -1; | |
198 | } | |
199 | } | |
200 | ||
201 | parse_arguments(argc, argv); | |
202 | ||
203 | /* don't allow the logs to be flooded too fast */ | |
204 | if (verbose > 1) verbose = 1; | |
205 | ||
206 | argc -= optind; | |
207 | argp = argv + optind; | |
208 | optind = 0; | |
209 | ||
210 | start_server(fd, fd, argc, argp); | |
211 | ||
212 | return 0; | |
213 | } | |
214 | ||
7a6421fa AT |
215 | /* send a list of available modules to the client. Don't list those |
216 | with "list = False". */ | |
3591c066 AT |
217 | static void send_listing(int fd) |
218 | { | |
219 | int n = lp_numservices(); | |
220 | int i; | |
221 | ||
222 | for (i=0;i<n;i++) | |
223 | if (lp_list(i)) | |
224 | io_printf(fd, "%-15s\t%s\n", lp_name(i), lp_comment(i)); | |
225 | } | |
226 | ||
227 | /* this is called when a socket connection is established to a client | |
228 | and we want to start talking. The setup of the system is done from | |
229 | here */ | |
230 | static int start_daemon(int fd) | |
231 | { | |
7a6421fa | 232 | char line[200]; |
3591c066 | 233 | char *motd; |
8ef4ffd6 | 234 | int i = -1; |
4cdf25e4 | 235 | extern char *config_file; |
13c5fc0e | 236 | extern int remote_version; |
4cdf25e4 AT |
237 | |
238 | if (!lp_load(config_file)) { | |
239 | exit_cleanup(1); | |
240 | } | |
3591c066 AT |
241 | |
242 | set_socket_options(fd,"SO_KEEPALIVE"); | |
243 | ||
244 | io_printf(fd,"@RSYNCD: %d\n", PROTOCOL_VERSION); | |
245 | ||
246 | motd = lp_motd_file(); | |
247 | if (*motd) { | |
248 | FILE *f = fopen(motd,"r"); | |
249 | while (f && !feof(f)) { | |
250 | int len = fread(line, 1, sizeof(line)-1, f); | |
251 | if (len > 0) { | |
252 | line[len] = 0; | |
253 | io_printf(fd,"%s", line); | |
254 | } | |
255 | } | |
256 | if (f) fclose(f); | |
257 | io_printf(fd,"\n"); | |
258 | } | |
259 | ||
91eee594 AT |
260 | if (!read_line(fd, line, sizeof(line)-1)) { |
261 | return -1; | |
262 | } | |
263 | ||
264 | if (sscanf(line,"@RSYNCD: %d", &remote_version) != 1) { | |
265 | return -1; | |
266 | } | |
267 | ||
8ef4ffd6 | 268 | while (i == -1) { |
3591c066 AT |
269 | |
270 | line[0] = 0; | |
271 | if (!read_line(fd, line, sizeof(line)-1)) { | |
272 | return -1; | |
273 | } | |
274 | ||
275 | if (!*line || strcmp(line,"#list")==0) { | |
276 | send_listing(fd); | |
277 | return -1; | |
278 | } | |
279 | ||
280 | if (*line == '#') { | |
281 | /* it's some sort of command that I don't understand */ | |
282 | io_printf(fd,"ERROR: Unknown command '%s'\n", line); | |
283 | return -1; | |
284 | } | |
285 | ||
286 | i = lp_number(line); | |
287 | if (i == -1) { | |
288 | io_printf(fd,"ERROR: Unknown module '%s'\n", line); | |
289 | return -1; | |
290 | } | |
3591c066 AT |
291 | } |
292 | ||
8ef4ffd6 | 293 | return rsync_module(fd, i); |
3591c066 AT |
294 | } |
295 | ||
296 | ||
297 | int daemon_main(void) | |
298 | { | |
3591c066 AT |
299 | if (is_a_socket(STDIN_FILENO)) { |
300 | /* we are running via inetd */ | |
301 | return start_daemon(STDIN_FILENO); | |
302 | } | |
303 | ||
304 | become_daemon(); | |
305 | ||
8ef4ffd6 AT |
306 | start_accept_loop(rsync_port, start_daemon); |
307 | return -1; | |
3591c066 AT |
308 | } |
309 |