2 Copyright (C) Andrew Tridgell 1998
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.
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.
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.
19 /* the socket based protocol for setting up a connection wit rsyncd */
26 extern int rsync_port;
28 int start_socket_client(char *host, char *path, int argc, char *argv[])
31 char *sargs[MAX_ARGS];
33 char line[MAXPATHLEN];
35 extern int remote_version;
39 p = strchr(host, '@');
46 if (!user) user = getenv("USER");
47 if (!user) user = getenv("LOGNAME");
51 fd = open_socket_out(host, rsync_port);
56 server_options(sargs,&sargc);
61 sargs[sargc++] = path;
65 io_printf(fd,"@RSYNCD: %d\n", PROTOCOL_VERSION);
67 if (!read_line(fd, line, sizeof(line)-1)) {
71 if (sscanf(line,"@RSYNCD: %d", &remote_version) != 1) {
77 io_printf(fd,"%s\n",path);
81 if (!read_line(fd, line, sizeof(line)-1)) {
85 if (strncmp(line,"@RSYNCD: AUTHREQD ",18) == 0) {
86 auth_client(fd, user, line+18);
90 if (strcmp(line,"@RSYNCD: OK") == 0) break;
91 rprintf(FINFO,"%s\n", line);
94 for (i=0;i<sargc;i++) {
95 io_printf(fd,"%s\n", sargs[i]);
99 if (remote_version > 17 && !am_sender)
100 io_start_multiplex_in(fd);
102 return client_run(fd, fd, -1, argc, argv);
107 static int rsync_module(int fd, int i)
110 char *argv[MAX_ARGS];
112 char line[MAXPATHLEN];
113 uid_t uid = (uid_t)-2;
114 gid_t gid = (gid_t)-2;
116 char *addr = client_addr(fd);
117 char *host = client_name(fd);
118 char *name = lp_name(i);
122 extern int am_sender;
123 extern int remote_version;
126 if (!allow_access(addr, host, lp_hosts_allow(i), lp_hosts_deny(i))) {
127 rprintf(FERROR,"rsync denied on module %s from %s (%s)\n",
128 name, client_name(fd), client_addr(fd));
129 io_printf(fd,"@ERROR: access denied to %s from %s (%s)\n",
130 name, client_name(fd), client_addr(fd));
134 if (!claim_connection(lp_lock_file(), lp_max_connections())) {
136 rprintf(FERROR,"failed to open lock file %s : %s\n",
137 lp_lock_file(), strerror(errno));
138 io_printf(fd,"@ERROR: failed to open lock file %s : %s\n",
139 lp_lock_file(), strerror(errno));
141 rprintf(FERROR,"max connections (%d) reached\n",
142 lp_max_connections());
143 io_printf(fd,"@ERROR: max connections (%d) reached - try again later\n", lp_max_connections());
149 user = auth_server(fd, i, addr, "@RSYNCD: AUTHREQD ");
152 rprintf(FERROR,"auth failed on module %s from %s (%s)\n",
153 name, client_name(fd), client_addr(fd));
154 io_printf(fd,"@ERROR: auth failed on module %s\n",name);
164 if (!name_to_uid(p, &uid)) {
166 rprintf(FERROR,"Invalid uid %s\n", p);
167 io_printf(fd,"@ERROR: invalid uid\n");
174 if (!name_to_gid(p, &gid)) {
176 rprintf(FERROR,"Invalid gid %s\n", p);
177 io_printf(fd,"@ERROR: invalid gid\n");
183 p = lp_exclude_from(i);
184 add_exclude_file(p, 1, 0);
191 if (chroot(lp_path(i))) {
192 rprintf(FERROR,"chroot %s failed\n", lp_path(i));
193 io_printf(fd,"@ERROR: chroot failed\n");
198 rprintf(FERROR,"chdir %s failed\n", lp_path(i));
199 io_printf(fd,"@ERROR: chdir failed\n");
203 if (setgid(gid) || getgid() != gid) {
204 rprintf(FERROR,"setgid %d failed\n", gid);
205 io_printf(fd,"@ERROR: setgid failed\n");
209 if (setuid(uid) || getuid() != uid) {
210 rprintf(FERROR,"setuid %d failed\n", uid);
211 io_printf(fd,"@ERROR: setuid failed\n");
215 am_root = (getuid() == 0);
217 io_printf(fd,"@RSYNCD: OK\n");
219 argv[argc++] = "rsyncd";
222 if (!read_line(fd, line, sizeof(line)-1)) {
230 argv[argc] = strdup(p);
236 if (start_glob == 1) {
240 glob_expand(name, argv, &argc, MAX_ARGS);
245 if (strcmp(line,".") == 0) {
249 if (argc == MAX_ARGS) {
254 parse_arguments(argc, argv);
258 rprintf(FINFO,"rsync %s %s from %s@%s (%s)\n",
260 request, user, host, addr);
262 rprintf(FINFO,"rsync %s %s from %s (%s)\n",
264 request, host, addr);
269 /* don't allow the logs to be flooded too fast */
270 if (verbose > 1) verbose = 1;
273 argp = argv + optind;
276 if (remote_version > 17 && am_sender)
277 io_start_multiplex_out(fd);
279 start_server(fd, fd, argc, argp);
284 /* send a list of available modules to the client. Don't list those
285 with "list = False". */
286 static void send_listing(int fd)
288 int n = lp_numservices();
293 io_printf(fd, "%-15s\t%s\n", lp_name(i), lp_comment(i));
296 /* this is called when a socket connection is established to a client
297 and we want to start talking. The setup of the system is done from
299 static int start_daemon(int fd)
304 extern char *config_file;
305 extern int remote_version;
307 if (!lp_load(config_file, 0)) {
311 set_socket_options(fd,"SO_KEEPALIVE");
312 set_socket_options(fd,lp_socket_options());
315 io_printf(fd,"@RSYNCD: %d\n", PROTOCOL_VERSION);
317 motd = lp_motd_file();
319 FILE *f = fopen(motd,"r");
320 while (f && !feof(f)) {
321 int len = fread(line, 1, sizeof(line)-1, f);
324 io_printf(fd,"%s", line);
331 if (!read_line(fd, line, sizeof(line)-1)) {
335 if (sscanf(line,"@RSYNCD: %d", &remote_version) != 1) {
336 io_printf(fd,"@ERROR: protocol startup error\n");
342 if (!read_line(fd, line, sizeof(line)-1)) {
346 if (!*line || strcmp(line,"#list")==0) {
352 /* it's some sort of command that I don't understand */
353 io_printf(fd,"@ERROR: Unknown command '%s'\n", line);
359 io_printf(fd,"@ERROR: Unknown module '%s'\n", line);
364 return rsync_module(fd, i);
368 int daemon_main(void)
370 extern char *config_file;
372 /* this ensures that we don't call getcwd after the chroot,
373 which doesn't work on platforms that use popen("pwd","r")
377 if (is_a_socket(STDIN_FILENO)) {
378 /* we are running via inetd */
379 return start_daemon(STDIN_FILENO);
384 if (!lp_load(config_file, 1)) {
385 fprintf(stderr,"failed to load config file %s\n", config_file);
391 rprintf(FINFO,"rsyncd version %s starting\n",VERSION);
393 start_accept_loop(rsync_port, start_daemon);