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.
24 * The socket based protocol for setting up a connection with
33 extern int rsync_port;
35 extern int sanitize_paths;
38 * Run a client connected to an rsyncd. The alternative to this
39 * function for remote-shell connections is do_cmd().
41 * After initial server startup, hands over to client_run().
43 * @return -1 for error in startup, or the result of client_run().
45 int start_socket_client(char *host, char *path, int argc, char *argv[])
48 char *sargs[MAX_ARGS];
50 char line[MAXPATHLEN];
52 extern int remote_version;
54 extern char *shell_cmd;
56 extern int kludge_around_eof;
57 extern char *bind_address;
58 extern int default_af_hint;
60 if (argc == 0 && !am_sender) {
65 /* This is just a friendliness enhancement: if the connection
66 * is to an rsyncd then there is no point specifying the -e option.
67 * Note that this is only set if the -e was explicitly specified,
68 * not if the environment variable just happens to be set.
69 * See http://lists.samba.org/pipermail/rsync/2000-September/002744.html
72 rprintf(FERROR, "WARNING: --rsh or -e option ignored when "
73 "connecting to rsync daemon\n");
78 rprintf(FERROR,"ERROR: The remote path must start with a module name not a /\n");
82 p = strchr(host, '@');
89 if (!user) user = getenv("USER");
90 if (!user) user = getenv("LOGNAME");
93 /* FIXME: If we're going to use a socket program for
94 * testing, then this message is wrong. We need to
95 * say something like "(except really using %s)" */
96 rprintf(FINFO, "opening tcp connection to %s port %d\n",
99 fd = open_socket_out_wrapped (host, rsync_port, bind_address,
102 exit_cleanup(RERR_SOCKETIO);
105 server_options(sargs,&sargc);
107 sargs[sargc++] = ".";
110 sargs[sargc++] = path;
114 io_printf(fd,"@RSYNCD: %d\n", PROTOCOL_VERSION);
116 if (!read_line(fd, line, sizeof(line)-1)) {
117 rprintf(FERROR, "rsync: did not see server greeting\n");
121 if (sscanf(line,"@RSYNCD: %d", &remote_version) != 1) {
122 /* note that read_line strips of \n or \r */
123 rprintf(FERROR, "rsync: server sent \"%s\" rather than greeting\n",
128 p = strchr(path,'/');
130 io_printf(fd,"%s\n",path);
133 /* Old servers may just drop the connection here,
134 rather than sending a proper EXIT command. Yuck. */
135 kludge_around_eof = list_only && (remote_version < 25);
138 if (!read_line(fd, line, sizeof(line)-1)) {
139 rprintf(FERROR, "rsync: didn't get server startup line\n");
143 if (strncmp(line,"@RSYNCD: AUTHREQD ",18) == 0) {
144 auth_client(fd, user, line+18);
148 if (strcmp(line,"@RSYNCD: OK") == 0) break;
150 if (strcmp(line,"@RSYNCD: EXIT") == 0) exit(0);
152 if (strncmp(line, "@ERROR", 6) == 0)
153 rprintf(FERROR,"%s\n", line);
155 rprintf(FINFO,"%s\n", line);
157 kludge_around_eof = False;
159 for (i=0;i<sargc;i++) {
160 io_printf(fd,"%s\n", sargs[i]);
164 if (remote_version < 23) {
165 if (remote_version == 22 || (remote_version > 17 && !am_sender))
166 io_start_multiplex_in(fd);
169 return client_run(fd, fd, -1, argc, argv);
174 static int rsync_module(int fd, int i)
177 char *argv[MAX_ARGS];
179 char line[MAXPATHLEN];
180 uid_t uid = (uid_t)-2; /* canonically "nobody" */
181 gid_t gid = (gid_t)-2;
183 char *addr = client_addr(fd);
184 char *host = client_name(fd);
185 char *name = lp_name(i);
186 int use_chroot = lp_use_chroot(i);
190 extern int am_sender;
191 extern int remote_version;
194 if (!allow_access(addr, host, lp_hosts_allow(i), lp_hosts_deny(i))) {
195 rprintf(FERROR,"rsync denied on module %s from %s (%s)\n",
197 io_printf(fd,"@ERROR: access denied to %s from %s (%s)\n",
202 if (!claim_connection(lp_lock_file(i), lp_max_connections(i))) {
204 rprintf(FERROR,"failed to open lock file %s : %s\n",
205 lp_lock_file(i), strerror(errno));
206 io_printf(fd,"@ERROR: failed to open lock file %s : %s\n",
207 lp_lock_file(i), strerror(errno));
209 rprintf(FERROR,"max connections (%d) reached\n",
210 lp_max_connections(i));
211 io_printf(fd,"@ERROR: max connections (%d) reached - try again later\n", lp_max_connections(i));
217 auth_user = auth_server(fd, i, addr, "@RSYNCD: AUTHREQD ");
220 rprintf(FERROR,"auth failed on module %s from %s (%s)\n",
221 name, client_name(fd), client_addr(fd));
222 io_printf(fd,"@ERROR: auth failed on module %s\n",name);
228 am_root = (getuid() == 0);
232 if (!name_to_uid(p, &uid)) {
234 rprintf(FERROR,"Invalid uid %s\n", p);
235 io_printf(fd,"@ERROR: invalid uid %s\n", p);
242 if (!name_to_gid(p, &gid)) {
244 rprintf(FERROR,"Invalid gid %s\n", p);
245 io_printf(fd,"@ERROR: invalid gid %s\n", p);
252 /* TODO: If we're not root, but the configuration requests
253 * that we change to some uid other than the current one, then
256 /* TODO: Perhaps take a list of gids, and make them into the
257 * supplementary groups. */
259 p = lp_include_from(i);
260 add_exclude_file(p, 1, 1);
265 p = lp_exclude_from(i);
266 add_exclude_file(p, 1, 0);
275 * XXX: The 'use chroot' flag is a fairly reliable
276 * source of confusion, because it fails under two
277 * important circumstances: running as non-root,
278 * running on Win32 (or possibly others). On the
279 * other hand, if you are running as root, then it
280 * might be better to always use chroot.
282 * So, perhaps if we can't chroot we should just issue
283 * a warning, unless a "require chroot" flag is set,
284 * in which case we fail.
286 if (chroot(lp_path(i))) {
287 rsyserr(FERROR, errno, "chroot %s failed", lp_path(i));
288 io_printf(fd,"@ERROR: chroot failed\n");
292 if (!push_dir("/", 0)) {
293 rsyserr(FERROR, errno, "chdir %s failed\n", lp_path(i));
294 io_printf(fd,"@ERROR: chdir failed\n");
299 if (!push_dir(lp_path(i), 0)) {
300 rsyserr(FERROR, errno, "chdir %s failed\n", lp_path(i));
301 io_printf(fd,"@ERROR: chdir failed\n");
308 #ifdef HAVE_SETGROUPS
309 /* Get rid of any supplementary groups this process
310 * might have inheristed. */
311 if (setgroups(0, NULL)) {
312 rsyserr(FERROR, errno, "setgroups failed");
313 io_printf(fd, "@ERROR: setgroups failed\n");
318 /* XXXX: You could argue that if the daemon is started
319 * by a non-root user and they explicitly specify a
320 * gid, then we should try to change to that gid --
321 * this could be possible if it's already in their
322 * supplementary groups. */
324 /* TODO: Perhaps we need to document that if rsyncd is
325 * started by somebody other than root it will inherit
326 * all their supplementary groups. */
329 rsyserr(FERROR, errno, "setgid %d failed", (int) gid);
330 io_printf(fd,"@ERROR: setgid failed\n");
335 rsyserr(FERROR, errno, "setuid %d failed", (int) uid);
336 io_printf(fd,"@ERROR: setuid failed\n");
340 am_root = (getuid() == 0);
343 io_printf(fd,"@RSYNCD: OK\n");
345 argv[argc++] = "rsyncd";
348 if (!read_line(fd, line, sizeof(line)-1)) {
356 argv[argc] = strdup(p);
362 if (start_glob == 1) {
366 glob_expand(name, argv, &argc, MAX_ARGS);
371 if (strcmp(line,".") == 0) {
375 if (argc == MAX_ARGS) {
380 if (sanitize_paths) {
382 * Note that this is applied to all parameters, whether or not
383 * they are filenames, but no other legal parameters contain
384 * the forms that need to be sanitized so it doesn't hurt;
385 * it is not known at this point which parameters are files
388 for (i = 1; i < argc; i++) {
389 sanitize_path(argv[i], NULL);
394 ret = parse_arguments(&argc, (const char ***) &argp, 0);
398 rprintf(FINFO,"rsync %s %s from %s@%s (%s)\n",
400 request, auth_user, host, addr);
402 rprintf(FINFO,"rsync %s %s from %s (%s)\n",
404 request, host, addr);
410 /* don't allow the logs to be flooded too fast */
411 if (verbose > 1) verbose = 1;
414 if (remote_version < 23) {
415 if (remote_version == 22 || (remote_version > 17 && am_sender))
416 io_start_multiplex_out(fd);
419 /* For later protocol versions, we don't start multiplexing
420 * until we've configured nonblocking in start_server. That
421 * means we're in a sticky situation now: there's no way to
422 * convey errors to the client. */
424 /* FIXME: Hold off on reporting option processing errors until
425 * we've set up nonblocking and multiplexed IO and can get the
426 * message back to them. */
429 exit_cleanup(RERR_UNSUPPORTED);
433 extern int io_timeout;
434 io_timeout = lp_timeout(i);
437 start_server(fd, fd, argc, argp);
442 /* send a list of available modules to the client. Don't list those
443 with "list = False". */
444 static void send_listing(int fd)
446 int n = lp_numservices();
448 extern int remote_version;
452 io_printf(fd, "%-15s\t%s\n", lp_name(i), lp_comment(i));
454 if (remote_version >= 25)
455 io_printf(fd,"@RSYNCD: EXIT\n");
458 /* this is called when a socket connection is established to a client
459 and we want to start talking. The setup of the system is done from
461 static int start_daemon(int fd)
466 extern char *config_file;
467 extern int remote_version;
469 if (!lp_load(config_file, 0)) {
470 exit_cleanup(RERR_SYNTAX);
473 set_socket_options(fd,"SO_KEEPALIVE");
474 set_socket_options(fd,lp_socket_options());
477 io_printf(fd,"@RSYNCD: %d\n", PROTOCOL_VERSION);
479 motd = lp_motd_file();
481 FILE *f = fopen(motd,"r");
482 while (f && !feof(f)) {
483 int len = fread(line, 1, sizeof(line)-1, f);
486 io_printf(fd,"%s", line);
493 if (!read_line(fd, line, sizeof(line)-1)) {
497 if (sscanf(line,"@RSYNCD: %d", &remote_version) != 1) {
498 io_printf(fd,"@ERROR: protocol startup error\n");
504 if (!read_line(fd, line, sizeof(line)-1)) {
508 if (!*line || strcmp(line,"#list")==0) {
514 /* it's some sort of command that I don't understand */
515 io_printf(fd,"@ERROR: Unknown command '%s'\n", line);
521 io_printf(fd,"@ERROR: Unknown module '%s'\n", line);
526 return rsync_module(fd, i);
530 int daemon_main(void)
532 extern char *config_file;
533 extern int orig_umask;
535 extern int no_detach;
537 if (is_a_socket(STDIN_FILENO)) {
540 /* we are running via inetd - close off stdout and
541 stderr so that library functions (and getopt) don't
542 try to use them. Redirect them to /dev/null */
545 open("/dev/null", O_RDWR);
548 return start_daemon(STDIN_FILENO);
554 if (!lp_load(config_file, 1)) {
555 exit_cleanup(RERR_SYNTAX);
560 rprintf(FINFO, "rsyncd version %s starting, listening on port %d\n",
563 /* TODO: If listening on a particular address, then show that
564 * address too. In fact, why not just do inet_ntop on the
565 * local address??? */
567 if (((pid_file = lp_pid_file()) != NULL) && (*pid_file != '\0')) {
570 int pid = (int) getpid();
571 cleanup_set_pid(pid);
572 if ((fd = do_open(lp_pid_file(), O_WRONLY|O_CREAT|O_TRUNC,
573 0666 & ~orig_umask)) == -1) {
575 rsyserr(FLOG, errno, "failed to create pid file %s", pid_file);
576 exit_cleanup(RERR_FILEIO);
578 snprintf(pidbuf, sizeof(pidbuf), "%d\n", pid);
579 write(fd, pidbuf, strlen(pidbuf));
583 start_accept_loop(rsync_port, start_daemon);