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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; | |
35 | int version; | |
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 | ||
3591c066 AT |
51 | if (!read_line(fd, line, sizeof(line)-1)) { |
52 | return -1; | |
53 | } | |
54 | ||
55 | if (sscanf(line,"@RSYNCD: %d", &version) != 1) { | |
56 | return -1; | |
57 | } | |
58 | ||
2c91d3d3 AT |
59 | io_printf(fd,"@RSYNCD: %d\n", PROTOCOL_VERSION); |
60 | ||
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 | } | |
70 | if (strcmp(line,"@RSYNCD: OK") == 0) break; | |
71 | rprintf(FINFO,"%s\n", line); | |
72 | } | |
73 | ||
74 | for (i=0;i<sargc;i++) { | |
75 | io_printf(fd,"%s\n", sargs[i]); | |
76 | } | |
77 | io_printf(fd,"\n"); | |
78 | ||
79 | #if 0 | |
80 | while (1) { | |
81 | if (!read_line(fd, line, sizeof(line)-1)) { | |
82 | return -1; | |
83 | } | |
84 | rprintf(FINFO,"%s\n", line); | |
85 | } | |
86 | #endif | |
87 | ||
88 | return client_run(fd, fd, -1, argc, argv); | |
89 | } | |
90 | ||
91 | ||
92 | ||
93 | static int rsync_module(int fd, int i) | |
94 | { | |
95 | int argc=0; | |
96 | char *argv[MAX_ARGS]; | |
97 | char **argp; | |
98 | char line[1024]; | |
99 | ||
100 | module_id = i; | |
101 | ||
102 | if (lp_read_only(i)) | |
103 | read_only = 1; | |
104 | ||
105 | rprintf(FERROR,"rsyncd starting\n"); | |
106 | ||
107 | if (chroot(lp_path(i))) { | |
108 | io_printf(fd,"@ERROR: chroot failed\n"); | |
109 | return -1; | |
110 | } | |
111 | ||
112 | if (chdir("/")) { | |
113 | io_printf(fd,"@ERROR: chdir failed\n"); | |
114 | return -1; | |
115 | } | |
116 | ||
117 | if (setgid(lp_gid(i))) { | |
118 | io_printf(fd,"@ERROR: setgid failed\n"); | |
119 | return -1; | |
120 | } | |
121 | ||
122 | if (setuid(lp_uid(i))) { | |
123 | io_printf(fd,"@ERROR: setuid failed\n"); | |
124 | return -1; | |
125 | } | |
126 | ||
127 | io_printf(fd,"@RSYNCD: OK\n"); | |
128 | ||
129 | argv[argc++] = "rsyncd"; | |
130 | ||
131 | while (1) { | |
132 | if (!read_line(fd, line, sizeof(line)-1)) { | |
133 | return -1; | |
134 | } | |
135 | ||
136 | if (!*line) break; | |
137 | ||
138 | argv[argc] = strdup(line); | |
139 | if (!argv[argc]) { | |
140 | return -1; | |
141 | } | |
142 | ||
143 | argc++; | |
144 | if (argc == MAX_ARGS) { | |
145 | return -1; | |
146 | } | |
147 | } | |
148 | ||
149 | parse_arguments(argc, argv); | |
150 | ||
151 | /* don't allow the logs to be flooded too fast */ | |
152 | if (verbose > 1) verbose = 1; | |
153 | ||
154 | argc -= optind; | |
155 | argp = argv + optind; | |
156 | optind = 0; | |
157 | ||
158 | start_server(fd, fd, argc, argp); | |
159 | ||
160 | return 0; | |
161 | } | |
162 | ||
163 | static void send_listing(int fd) | |
164 | { | |
165 | int n = lp_numservices(); | |
166 | int i; | |
167 | ||
168 | for (i=0;i<n;i++) | |
169 | if (lp_list(i)) | |
170 | io_printf(fd, "%-15s\t%s\n", lp_name(i), lp_comment(i)); | |
171 | } | |
172 | ||
173 | /* this is called when a socket connection is established to a client | |
174 | and we want to start talking. The setup of the system is done from | |
175 | here */ | |
176 | static int start_daemon(int fd) | |
177 | { | |
178 | char line[1024]; | |
179 | char *motd; | |
2c91d3d3 | 180 | int version; |
3591c066 AT |
181 | |
182 | set_socket_options(fd,"SO_KEEPALIVE"); | |
183 | ||
184 | io_printf(fd,"@RSYNCD: %d\n", PROTOCOL_VERSION); | |
185 | ||
2c91d3d3 AT |
186 | if (!read_line(fd, line, sizeof(line)-1)) { |
187 | return -1; | |
188 | } | |
189 | ||
190 | if (sscanf(line,"@RSYNCD: %d", &version) != 1) { | |
191 | return -1; | |
192 | } | |
193 | ||
3591c066 AT |
194 | motd = lp_motd_file(); |
195 | if (*motd) { | |
196 | FILE *f = fopen(motd,"r"); | |
197 | while (f && !feof(f)) { | |
198 | int len = fread(line, 1, sizeof(line)-1, f); | |
199 | if (len > 0) { | |
200 | line[len] = 0; | |
201 | io_printf(fd,"%s", line); | |
202 | } | |
203 | } | |
204 | if (f) fclose(f); | |
205 | io_printf(fd,"\n"); | |
206 | } | |
207 | ||
208 | /* read a single line indicating the resource that is wanted */ | |
209 | while (1) { | |
210 | int i; | |
211 | ||
212 | line[0] = 0; | |
213 | if (!read_line(fd, line, sizeof(line)-1)) { | |
214 | return -1; | |
215 | } | |
216 | ||
217 | if (!*line || strcmp(line,"#list")==0) { | |
218 | send_listing(fd); | |
219 | return -1; | |
220 | } | |
221 | ||
222 | if (*line == '#') { | |
223 | /* it's some sort of command that I don't understand */ | |
224 | io_printf(fd,"ERROR: Unknown command '%s'\n", line); | |
225 | return -1; | |
226 | } | |
227 | ||
228 | i = lp_number(line); | |
229 | if (i == -1) { | |
230 | io_printf(fd,"ERROR: Unknown module '%s'\n", line); | |
231 | return -1; | |
232 | } | |
233 | ||
234 | return rsync_module(fd, i); | |
235 | } | |
236 | ||
237 | return 0; | |
238 | } | |
239 | ||
240 | ||
241 | int daemon_main(void) | |
242 | { | |
243 | if (!lp_load(RSYNCD_CONF)) { | |
244 | exit_cleanup(1); | |
245 | } | |
246 | ||
247 | if (is_a_socket(STDIN_FILENO)) { | |
248 | /* we are running via inetd */ | |
249 | return start_daemon(STDIN_FILENO); | |
250 | } | |
251 | ||
252 | become_daemon(); | |
253 | ||
254 | return start_accept_loop(rsync_port, start_daemon); | |
255 | } | |
256 |