1 /* -*- c-file-style: "linux"; -*-
3 Copyright (C) 1998-2001 by Andrew Tridgell <tridge@samba.org>
4 Copyright (C) 2001-2002 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 * After initial server startup, hands over to client_run().
38 * @return -1 for error in startup, or the result of client_run().
40 int start_socket_client(char *host, char *path, int argc, char *argv[])
43 char *sargs[MAX_ARGS];
45 char line[MAXPATHLEN];
47 extern int remote_version;
49 extern char *shell_cmd;
50 extern int kludge_around_eof;
51 extern char *bind_address;
52 extern int default_af_hint;
54 if (argc == 0 && !am_sender) {
59 /* This is just a friendliness enhancement: if the connection
60 * is to an rsyncd then there is no point specifying the -e option.
61 * Note that this is only set if the -e was explicitly specified,
62 * not if the environment variable just happens to be set.
63 * See http://lists.samba.org/pipermail/rsync/2000-September/002744.html
66 rprintf(FERROR, "WARNING: --rsh or -e option ignored when "
67 "connecting to rsync daemon\n");
72 rprintf(FERROR,"ERROR: The remote path must start with a module name not a /\n");
76 p = strchr(host, '@');
83 if (!user) user = getenv("USER");
84 if (!user) user = getenv("LOGNAME");
87 /* FIXME: If we're going to use a socket program for
88 * testing, then this message is wrong. We need to
89 * say something like "(except really using %s)" */
90 rprintf(FINFO, "opening tcp connection to %s port %d\n",
93 fd = open_socket_out_wrapped (host, rsync_port, bind_address,
96 exit_cleanup(RERR_SOCKETIO);
99 server_options(sargs,&sargc);
101 sargs[sargc++] = ".";
104 sargs[sargc++] = path;
108 io_printf(fd,"@RSYNCD: %d\n", PROTOCOL_VERSION);
110 if (!read_line(fd, line, sizeof(line)-1)) {
111 rprintf(FERROR, "rsync: did not see server greeting\n");
115 if (sscanf(line,"@RSYNCD: %d", &remote_version) != 1) {
116 /* note that read_line strips of \n or \r */
117 rprintf(FERROR, "rsync: server sent \"%s\" rather than greeting\n",
122 p = strchr(path,'/');
124 io_printf(fd,"%s\n",path);
127 /* Old servers may just drop the connection here,
128 rather than sending a proper EXIT command. Yuck. */
129 kludge_around_eof = remote_version < 25;
132 if (!read_line(fd, line, sizeof(line)-1)) {
133 rprintf(FERROR, "rsync: didn't get server startup line\n");
137 if (strncmp(line,"@RSYNCD: AUTHREQD ",18) == 0) {
138 auth_client(fd, user, line+18);
142 if (strcmp(line,"@RSYNCD: OK") == 0) break;
144 if (strcmp(line,"@RSYNCD: EXIT") == 0) exit(0);
146 if (strncmp(line, "@ERROR", 6) == 0)
147 rprintf(FERROR,"%s\n", line);
149 rprintf(FINFO,"%s\n", line);
151 kludge_around_eof = False;
153 for (i=0;i<sargc;i++) {
154 io_printf(fd,"%s\n", sargs[i]);
158 if (remote_version < 23) {
159 if (remote_version == 22 || (remote_version > 17 && !am_sender))
160 io_start_multiplex_in(fd);
163 return client_run(fd, fd, -1, argc, argv);
168 static int rsync_module(int fd, int i)
171 char *argv[MAX_ARGS];
173 char line[MAXPATHLEN];
174 uid_t uid = (uid_t)-2; /* canonically "nobody" */
175 gid_t gid = (gid_t)-2;
177 char *addr = client_addr(fd);
178 char *host = client_name(fd);
179 char *name = lp_name(i);
180 int use_chroot = lp_use_chroot(i);
184 extern int am_sender;
185 extern int remote_version;
188 if (!allow_access(addr, host, lp_hosts_allow(i), lp_hosts_deny(i))) {
189 rprintf(FERROR,"rsync denied on module %s from %s (%s)\n",
191 io_printf(fd,"@ERROR: access denied to %s from %s (%s)\n",
196 if (!claim_connection(lp_lock_file(i), lp_max_connections(i))) {
198 rprintf(FERROR,"failed to open lock file %s : %s\n",
199 lp_lock_file(i), strerror(errno));
200 io_printf(fd,"@ERROR: failed to open lock file %s : %s\n",
201 lp_lock_file(i), strerror(errno));
203 rprintf(FERROR,"max connections (%d) reached\n",
204 lp_max_connections(i));
205 io_printf(fd,"@ERROR: max connections (%d) reached - try again later\n", lp_max_connections(i));
211 auth_user = auth_server(fd, i, addr, "@RSYNCD: AUTHREQD ");
214 rprintf(FERROR,"auth failed on module %s from %s (%s)\n",
215 name, client_name(fd), client_addr(fd));
216 io_printf(fd,"@ERROR: auth failed on module %s\n",name);
222 am_root = (getuid() == 0);
226 if (!name_to_uid(p, &uid)) {
228 rprintf(FERROR,"Invalid uid %s\n", p);
229 io_printf(fd,"@ERROR: invalid uid %s\n", p);
236 if (!name_to_gid(p, &gid)) {
238 rprintf(FERROR,"Invalid gid %s\n", p);
239 io_printf(fd,"@ERROR: invalid gid %s\n", p);
246 /* TODO: If we're not root, but the configuration requests
247 * that we change to some uid other than the current one, then
250 /* TODO: Perhaps take a list of gids, and make them into the
251 * supplementary groups. */
253 p = lp_include_from(i);
254 add_exclude_file(p, 1, 1);
259 p = lp_exclude_from(i);
260 add_exclude_file(p, 1, 0);
269 * XXX: The 'use chroot' flag is a fairly reliable
270 * source of confusion, because it fails under two
271 * important circumstances: running as non-root,
272 * running on Win32 (or possibly others). On the
273 * other hand, if you are running as root, then it
274 * might be better to always use chroot.
276 * So, perhaps if we can't chroot we should just issue
277 * a warning, unless a "require chroot" flag is set,
278 * in which case we fail.
280 if (chroot(lp_path(i))) {
281 rsyserr(FERROR, errno, "chroot %s failed", lp_path(i));
282 io_printf(fd,"@ERROR: chroot failed\n");
286 if (!push_dir("/", 0)) {
287 rsyserr(FERROR, errno, "chdir %s failed\n", lp_path(i));
288 io_printf(fd,"@ERROR: chdir failed\n");
293 if (!push_dir(lp_path(i), 0)) {
294 rsyserr(FERROR, errno, "chdir %s failed\n", lp_path(i));
295 io_printf(fd,"@ERROR: chdir failed\n");
302 #ifdef HAVE_SETGROUPS
303 /* Get rid of any supplementary groups this process
304 * might have inheristed. */
305 if (setgroups(0, NULL)) {
306 rsyserr(FERROR, errno, "setgroups failed");
307 io_printf(fd, "@ERROR: setgroups failed\n");
312 /* XXXX: You could argue that if the daemon is started
313 * by a non-root user and they explicitly specify a
314 * gid, then we should try to change to that gid --
315 * this could be possible if it's already in their
316 * supplementary groups. */
318 /* TODO: Perhaps we need to document that if rsyncd is
319 * started by somebody other than root it will inherit
320 * all their supplementary groups. */
323 rsyserr(FERROR, errno, "setgid %d failed", (int) gid);
324 io_printf(fd,"@ERROR: setgid failed\n");
329 rsyserr(FERROR, errno, "setuid %d failed", (int) uid);
330 io_printf(fd,"@ERROR: setuid failed\n");
334 am_root = (getuid() == 0);
337 io_printf(fd,"@RSYNCD: OK\n");
339 argv[argc++] = "rsyncd";
342 if (!read_line(fd, line, sizeof(line)-1)) {
350 argv[argc] = strdup(p);
356 if (start_glob == 1) {
360 glob_expand(name, argv, &argc, MAX_ARGS);
365 if (strcmp(line,".") == 0) {
369 if (argc == MAX_ARGS) {
374 if (sanitize_paths) {
376 * Note that this is applied to all parameters, whether or not
377 * they are filenames, but no other legal parameters contain
378 * the forms that need to be sanitized so it doesn't hurt;
379 * it is not known at this point which parameters are files
382 for (i = 1; i < argc; i++) {
383 sanitize_path(argv[i], NULL);
388 ret = parse_arguments(&argc, (const char ***) &argp, 0);
392 rprintf(FINFO,"rsync %s %s from %s@%s (%s)\n",
394 request, auth_user, host, addr);
396 rprintf(FINFO,"rsync %s %s from %s (%s)\n",
398 request, host, addr);
404 /* don't allow the logs to be flooded too fast */
405 if (verbose > 1) verbose = 1;
408 if (remote_version < 23) {
409 if (remote_version == 22 || (remote_version > 17 && am_sender))
410 io_start_multiplex_out(fd);
413 /* For later protocol versions, we don't start multiplexing
414 * until we've configured nonblocking in start_server. That
415 * means we're in a sticky situation now: there's no way to
416 * convey errors to the client. */
418 /* FIXME: Hold off on reporting option processing errors until
419 * we've set up nonblocking and multiplexed IO and can get the
420 * message back to them. */
423 exit_cleanup(RERR_UNSUPPORTED);
427 extern int io_timeout;
428 io_timeout = lp_timeout(i);
431 start_server(fd, fd, argc, argp);
436 /* send a list of available modules to the client. Don't list those
437 with "list = False". */
438 static void send_listing(int fd)
440 int n = lp_numservices();
442 extern int remote_version;
446 io_printf(fd, "%-15s\t%s\n", lp_name(i), lp_comment(i));
448 if (remote_version >= 25)
449 io_printf(fd,"@RSYNCD: EXIT\n");
452 /* this is called when a socket connection is established to a client
453 and we want to start talking. The setup of the system is done from
455 static int start_daemon(int fd)
460 extern char *config_file;
461 extern int remote_version;
463 if (!lp_load(config_file, 0)) {
464 exit_cleanup(RERR_SYNTAX);
467 set_socket_options(fd,"SO_KEEPALIVE");
468 set_socket_options(fd,lp_socket_options());
471 io_printf(fd,"@RSYNCD: %d\n", PROTOCOL_VERSION);
473 motd = lp_motd_file();
475 FILE *f = fopen(motd,"r");
476 while (f && !feof(f)) {
477 int len = fread(line, 1, sizeof(line)-1, f);
480 io_printf(fd,"%s", line);
487 if (!read_line(fd, line, sizeof(line)-1)) {
491 if (sscanf(line,"@RSYNCD: %d", &remote_version) != 1) {
492 io_printf(fd,"@ERROR: protocol startup error\n");
498 if (!read_line(fd, line, sizeof(line)-1)) {
502 if (!*line || strcmp(line,"#list")==0) {
508 /* it's some sort of command that I don't understand */
509 io_printf(fd,"@ERROR: Unknown command '%s'\n", line);
515 io_printf(fd,"@ERROR: Unknown module '%s'\n", line);
520 return rsync_module(fd, i);
524 int daemon_main(void)
526 extern char *config_file;
527 extern int orig_umask;
529 extern int no_detach;
531 if (is_a_socket(STDIN_FILENO)) {
534 /* we are running via inetd - close off stdout and
535 stderr so that library functions (and getopt) don't
536 try to use them. Redirect them to /dev/null */
539 open("/dev/null", O_RDWR);
542 return start_daemon(STDIN_FILENO);
548 if (!lp_load(config_file, 1)) {
549 exit_cleanup(RERR_SYNTAX);
554 rprintf(FINFO, "rsyncd version %s starting, listening on port %d\n",
557 /* TODO: If listening on a particular address, then show that
558 * address too. In fact, why not just do inet_ntop on the
559 * local address??? */
561 if (((pid_file = lp_pid_file()) != NULL) && (*pid_file != '\0')) {
564 int pid = (int) getpid();
565 cleanup_set_pid(pid);
566 if ((fd = do_open(lp_pid_file(), O_WRONLY|O_CREAT|O_TRUNC,
567 0666 & ~orig_umask)) == -1) {
569 rsyserr(FLOG, errno, "failed to create pid file %s", pid_file);
570 exit_cleanup(RERR_FILEIO);
572 snprintf(pidbuf, sizeof(pidbuf), "%d\n", pid);
573 write(fd, pidbuf, strlen(pidbuf));
577 start_accept_loop(rsync_port, start_daemon);