1 /* -*- c-file-style: "linux"; -*-
3 Copyright (C) 1998-2001 by Andrew Tridgell <tridge@samba.org>
4 Copyright (C) 2001 by Martin Pool <mbp@samba.org>
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 /* the socket based protocol for setting up a connection with rsyncd */
28 extern int rsync_port;
30 int sanitize_paths = 0;
33 * Run a client connected to an rsyncd. The alternative to this
34 * function for remote-shell connections is do_cmd.
36 int start_socket_client(char *host, char *path, int argc, char *argv[])
39 char *sargs[MAX_ARGS];
41 char line[MAXPATHLEN];
43 extern int remote_version;
45 extern char *shell_cmd;
46 extern int kludge_around_eof;
47 extern char *bind_address;
49 if (argc == 0 && !am_sender) {
54 /* This is just a friendliness enhancement: if the connection
55 * is to an rsyncd then there is no point specifying the -e option.
56 * Note that this is only set if the -e was explicitly specified,
57 * not if the environment variable just happens to be set.
58 * See http://lists.samba.org/pipermail/rsync/2000-September/002744.html
61 rprintf(FERROR, "WARNING: --rsh or -e option ignored when "
62 "connecting to rsync daemon\n");
67 rprintf(FERROR,"ERROR: The remote path must start with a module name not a /\n");
71 p = strchr(host, '@');
78 if (!user) user = getenv("USER");
79 if (!user) user = getenv("LOGNAME");
81 fd = open_socket_out_wrapped (host, rsync_port, bind_address,
84 exit_cleanup(RERR_SOCKETIO);
87 server_options(sargs,&sargc);
92 sargs[sargc++] = path;
96 io_printf(fd,"@RSYNCD: %d\n", PROTOCOL_VERSION);
98 if (!read_line(fd, line, sizeof(line)-1)) {
102 if (sscanf(line,"@RSYNCD: %d", &remote_version) != 1) {
106 p = strchr(path,'/');
108 io_printf(fd,"%s\n",path);
111 /* Old servers may just drop the connection here,
112 rather than sending a proper EXIT command. Yuck. */
113 kludge_around_eof = remote_version < 25;
116 if (!read_line(fd, line, sizeof(line)-1)) {
120 if (strncmp(line,"@RSYNCD: AUTHREQD ",18) == 0) {
121 auth_client(fd, user, line+18);
125 if (strcmp(line,"@RSYNCD: OK") == 0) break;
127 if (strcmp(line,"@RSYNCD: EXIT") == 0) exit(0);
129 rprintf(FINFO,"%s\n", line);
131 kludge_around_eof = False;
133 for (i=0;i<sargc;i++) {
134 io_printf(fd,"%s\n", sargs[i]);
138 if (remote_version < 23) {
139 if (remote_version == 22 || (remote_version > 17 && !am_sender))
140 io_start_multiplex_in(fd);
143 return client_run(fd, fd, -1, argc, argv);
148 static int rsync_module(int fd, int i)
151 char *argv[MAX_ARGS];
153 char line[MAXPATHLEN];
154 uid_t uid = (uid_t)-2; /* canonically "nobody" */
155 gid_t gid = (gid_t)-2;
157 char *addr = client_addr(fd);
158 char *host = client_name(fd);
159 char *name = lp_name(i);
160 int use_chroot = lp_use_chroot(i);
164 extern int am_sender;
165 extern int remote_version;
168 if (!allow_access(addr, host, lp_hosts_allow(i), lp_hosts_deny(i))) {
169 rprintf(FERROR,"rsync denied on module %s from %s (%s)\n",
170 name, client_name(fd), client_addr(fd));
171 io_printf(fd,"@ERROR: access denied to %s from %s (%s)\n",
172 name, client_name(fd), client_addr(fd));
176 if (!claim_connection(lp_lock_file(i), lp_max_connections(i))) {
178 rprintf(FERROR,"failed to open lock file %s : %s\n",
179 lp_lock_file(i), strerror(errno));
180 io_printf(fd,"@ERROR: failed to open lock file %s : %s\n",
181 lp_lock_file(i), strerror(errno));
183 rprintf(FERROR,"max connections (%d) reached\n",
184 lp_max_connections(i));
185 io_printf(fd,"@ERROR: max connections (%d) reached - try again later\n", lp_max_connections(i));
191 auth_user = auth_server(fd, i, addr, "@RSYNCD: AUTHREQD ");
194 rprintf(FERROR,"auth failed on module %s from %s (%s)\n",
195 name, client_name(fd), client_addr(fd));
196 io_printf(fd,"@ERROR: auth failed on module %s\n",name);
202 am_root = (getuid() == 0);
206 if (!name_to_uid(p, &uid)) {
208 rprintf(FERROR,"Invalid uid %s\n", p);
209 io_printf(fd,"@ERROR: invalid uid %s\n", p);
216 if (!name_to_gid(p, &gid)) {
218 rprintf(FERROR,"Invalid gid %s\n", p);
219 io_printf(fd,"@ERROR: invalid gid %s\n", p);
226 /* TODO: If we're not root, but the configuration requests
227 * that we change to some uid other than the current one, then
230 /* TODO: Perhaps take a list of gids, and make them into the
231 * supplementary groups. */
233 p = lp_include_from(i);
234 add_exclude_file(p, 1, 1);
239 p = lp_exclude_from(i);
240 add_exclude_file(p, 1, 0);
249 * XXX: The 'use chroot' flag is a fairly reliable
250 * source of confusion, because it fails under two
251 * important circumstances: running as non-root,
252 * running on Win32 (or possibly others). On the
253 * other hand, if you are running as root, then it
254 * might be better to always use chroot.
256 * So, perhaps if we can't chroot we should just issue
257 * a warning, unless a "require chroot" flag is set,
258 * in which case we fail.
260 if (chroot(lp_path(i))) {
261 rsyserr(FERROR, errno, "chroot %s failed", lp_path(i));
262 io_printf(fd,"@ERROR: chroot failed\n");
266 if (!push_dir("/", 0)) {
267 rsyserr(FERROR, errno, "chdir %s failed\n", lp_path(i));
268 io_printf(fd,"@ERROR: chdir failed\n");
273 if (!push_dir(lp_path(i), 0)) {
274 rsyserr(FERROR, errno, "chdir %s failed\n", lp_path(i));
275 io_printf(fd,"@ERROR: chdir failed\n");
283 rsyserr(FERROR, errno, "setgid %d failed", (int) gid);
284 io_printf(fd,"@ERROR: setgid failed\n");
289 rsyserr(FERROR, errno, "setuid %d failed", (int) uid);
290 io_printf(fd,"@ERROR: setuid failed\n");
294 am_root = (getuid() == 0);
297 io_printf(fd,"@RSYNCD: OK\n");
299 argv[argc++] = "rsyncd";
302 if (!read_line(fd, line, sizeof(line)-1)) {
310 argv[argc] = strdup(p);
316 if (start_glob == 1) {
320 glob_expand(name, argv, &argc, MAX_ARGS);
325 if (strcmp(line,".") == 0) {
329 if (argc == MAX_ARGS) {
334 if (sanitize_paths) {
336 * Note that this is applied to all parameters, whether or not
337 * they are filenames, but no other legal parameters contain
338 * the forms that need to be sanitized so it doesn't hurt;
339 * it is not known at this point which parameters are files
342 for (i = 1; i < argc; i++) {
343 sanitize_path(argv[i], NULL);
348 ret = parse_arguments(&argc, (const char ***) &argp, 0);
352 rprintf(FINFO,"rsync %s %s from %s@%s (%s)\n",
354 request, auth_user, host, addr);
356 rprintf(FINFO,"rsync %s %s from %s (%s)\n",
358 request, host, addr);
364 /* don't allow the logs to be flooded too fast */
365 if (verbose > 1) verbose = 1;
368 if (remote_version < 23) {
369 if (remote_version == 22 || (remote_version > 17 && am_sender))
370 io_start_multiplex_out(fd);
373 /* For later protocol versions, we don't start multiplexing
374 * until we've configured nonblocking in start_server. That
375 * means we're in a sticky situation now: there's no way to
376 * convey errors to the client. */
378 /* FIXME: Hold off on reporting option processing errors until
379 * we've set up nonblocking and multiplexed IO and can get the
380 * message back to them. */
383 exit_cleanup(RERR_UNSUPPORTED);
387 extern int io_timeout;
388 io_timeout = lp_timeout(i);
391 start_server(fd, fd, argc, argp);
396 /* send a list of available modules to the client. Don't list those
397 with "list = False". */
398 static void send_listing(int fd)
400 int n = lp_numservices();
402 extern int remote_version;
406 io_printf(fd, "%-15s\t%s\n", lp_name(i), lp_comment(i));
408 if (remote_version >= 25)
409 io_printf(fd,"@RSYNCD: EXIT\n");
412 /* this is called when a socket connection is established to a client
413 and we want to start talking. The setup of the system is done from
415 static int start_daemon(int fd)
420 extern char *config_file;
421 extern int remote_version;
423 if (!lp_load(config_file, 0)) {
424 exit_cleanup(RERR_SYNTAX);
427 set_socket_options(fd,"SO_KEEPALIVE");
428 set_socket_options(fd,lp_socket_options());
431 io_printf(fd,"@RSYNCD: %d\n", PROTOCOL_VERSION);
433 motd = lp_motd_file();
435 FILE *f = fopen(motd,"r");
436 while (f && !feof(f)) {
437 int len = fread(line, 1, sizeof(line)-1, f);
440 io_printf(fd,"%s", line);
447 if (!read_line(fd, line, sizeof(line)-1)) {
451 if (sscanf(line,"@RSYNCD: %d", &remote_version) != 1) {
452 io_printf(fd,"@ERROR: protocol startup error\n");
458 if (!read_line(fd, line, sizeof(line)-1)) {
462 if (!*line || strcmp(line,"#list")==0) {
468 /* it's some sort of command that I don't understand */
469 io_printf(fd,"@ERROR: Unknown command '%s'\n", line);
475 io_printf(fd,"@ERROR: Unknown module '%s'\n", line);
480 return rsync_module(fd, i);
484 int daemon_main(void)
486 extern char *config_file;
487 extern int orig_umask;
490 if (is_a_socket(STDIN_FILENO)) {
493 /* we are running via inetd - close off stdout and
494 stderr so that library functions (and getopt) don't
495 try to use them. Redirect them to /dev/null */
498 open("/dev/null", O_RDWR);
501 return start_daemon(STDIN_FILENO);
506 if (!lp_load(config_file, 1)) {
507 exit_cleanup(RERR_SYNTAX);
512 rprintf(FINFO, "rsyncd version %s starting, listening on port %d\n",
515 /* TODO: If listening on a particular address, then show that
518 if (((pid_file = lp_pid_file()) != NULL) && (*pid_file != '\0')) {
521 int pid = (int) getpid();
522 cleanup_set_pid(pid);
523 if ((fd = do_open(lp_pid_file(), O_WRONLY|O_CREAT|O_TRUNC,
524 0666 & ~orig_umask)) == -1) {
526 rsyserr(FLOG, errno, "failed to create pid file %s", pid_file);
527 exit_cleanup(RERR_FILEIO);
529 snprintf(pidbuf, sizeof(pidbuf), "%d\n", pid);
530 write(fd, pidbuf, strlen(pidbuf));
534 start_accept_loop(rsync_port, start_daemon);