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
37 extern int rsync_port;
38 extern int kludge_around_eof;
39 extern int daemon_over_rsh;
41 extern int sanitize_paths;
42 extern int filesfrom_fd;
43 extern int remote_protocol;
44 extern int protocol_version;
45 extern int io_timeout;
46 extern int select_timeout;
47 extern int orig_umask;
49 extern int default_af_hint;
50 extern char *bind_address;
51 extern struct exclude_list_struct server_exclude_list;
52 extern char *exclude_path_prefix;
53 extern char *config_file;
54 extern char *files_from;
59 * Run a client connected to an rsyncd. The alternative to this
60 * function for remote-shell connections is do_cmd().
62 * After negotiating which module to use and reading the server's
63 * motd, this hands over to client_run(). Telling the server the
64 * module will cause it to chroot/setuid/etc.
66 * Instead of doing a transfer, the client may at this stage instead
67 * get a listing of remote modules and exit.
69 * @return -1 for error in startup, or the result of client_run().
70 * Either way, it eventually gets passed to exit_cleanup().
72 int start_socket_client(char *host, char *path, int argc, char *argv[])
75 char *p, *user = NULL;
77 /* This is redundant with code in start_inband_exchange(), but this
78 * short-circuits a problem in the client before we open a socket,
79 * and the extra check won't hurt. */
82 "ERROR: The remote path must start with a module name not a /\n");
86 if ((p = strchr(host, '@')) != NULL) {
93 rsync_port = RSYNC_PORT;
95 fd = open_socket_out_wrapped(host, rsync_port, bind_address,
98 exit_cleanup(RERR_SOCKETIO);
100 ret = start_inband_exchange(user, path, fd, fd, argc);
102 return ret < 0? ret : client_run(fd, fd, -1, argc, argv);
105 int start_inband_exchange(char *user, char *path, int f_in, int f_out,
109 char *sargs[MAX_ARGS];
111 char line[MAXPATHLEN];
114 if (argc == 0 && !am_sender)
119 "ERROR: The remote path must start with a module name\n");
124 user = getenv("USER");
126 user = getenv("LOGNAME");
128 /* set daemon_over_rsh to false since we need to build the
129 * true set of args passed through the rsh/ssh connection;
130 * this is a no-op for direct-socket-connection mode */
132 server_options(sargs, &sargc);
134 sargs[sargc++] = ".";
137 sargs[sargc++] = path;
141 io_printf(f_out, "@RSYNCD: %d\n", protocol_version);
143 if (!read_line(f_in, line, sizeof line - 1)) {
144 rprintf(FERROR, "rsync: did not see server greeting\n");
148 if (sscanf(line,"@RSYNCD: %d", &remote_protocol) != 1) {
149 /* note that read_line strips of \n or \r */
150 rprintf(FERROR, "rsync: server sent \"%s\" rather than greeting\n",
154 if (protocol_version > remote_protocol)
155 protocol_version = remote_protocol;
157 p = strchr(path,'/');
159 io_printf(f_out, "%s\n", path);
162 /* Old servers may just drop the connection here,
163 rather than sending a proper EXIT command. Yuck. */
164 kludge_around_eof = list_only && (protocol_version < 25);
167 if (!read_line(f_in, line, sizeof line - 1)) {
168 rprintf(FERROR, "rsync: didn't get server startup line\n");
172 if (strncmp(line,"@RSYNCD: AUTHREQD ",18) == 0) {
173 auth_client(f_out, user, line+18);
177 if (strcmp(line,"@RSYNCD: OK") == 0)
180 if (strcmp(line,"@RSYNCD: EXIT") == 0) {
181 /* This is sent by recent versions of the
182 * server to terminate the listing of modules.
183 * We don't want to go on and transfer
184 * anything; just exit. */
188 if (strncmp(line, "@ERROR", 6) == 0) {
189 rprintf(FERROR, "%s\n", line);
190 /* This is always fatal; the server will now
191 * close the socket. */
192 return RERR_STARTCLIENT;
194 rprintf(FINFO,"%s\n", line);
197 kludge_around_eof = False;
199 for (i = 0; i < sargc; i++) {
200 io_printf(f_out, "%s\n", sargs[i]);
202 io_printf(f_out, "\n");
204 if (protocol_version < 23) {
205 if (protocol_version == 22 || !am_sender)
206 io_start_multiplex_in();
214 static int rsync_module(int f_in, int f_out, int i)
220 char line[MAXPATHLEN];
221 uid_t uid = (uid_t)-2; /* canonically "nobody" */
222 gid_t gid = (gid_t)-2;
224 char *addr = client_addr(f_in);
225 char *host = client_name(f_in);
226 char *name = lp_name(i);
227 int use_chroot = lp_use_chroot(i);
230 char *request = NULL;
232 if (!allow_access(addr, host, lp_hosts_allow(i), lp_hosts_deny(i))) {
233 rprintf(FLOG, "rsync denied on module %s from %s (%s)\n",
236 io_printf(f_out, "@ERROR: Unknown module '%s'\n", name);
239 "@ERROR: access denied to %s from %s (%s)\n",
245 if (am_daemon && am_server) {
246 rprintf(FLOG, "rsync allowed access on module %s from %s (%s)\n",
250 if (!claim_connection(lp_lock_file(i), lp_max_connections(i))) {
252 rsyserr(FLOG, errno, "failed to open lock file %s",
254 io_printf(f_out, "@ERROR: failed to open lock file %s\n",
257 rprintf(FLOG, "max connections (%d) reached\n",
258 lp_max_connections(i));
259 io_printf(f_out, "@ERROR: max connections (%d) reached - try again later\n",
260 lp_max_connections(i));
265 auth_user = auth_server(f_in, f_out, i, addr, "@RSYNCD: AUTHREQD ");
268 rprintf(FLOG, "auth failed on module %s from %s (%s)\n",
270 io_printf(f_out, "@ERROR: auth failed on module %s\n", name);
276 am_root = (MY_UID() == 0);
280 if (!name_to_uid(p, &uid)) {
281 if (!isdigit(*(unsigned char *)p)) {
282 rprintf(FLOG, "Invalid uid %s\n", p);
283 io_printf(f_out, "@ERROR: invalid uid %s\n", p);
290 if (!name_to_gid(p, &gid)) {
291 if (!isdigit(*(unsigned char *)p)) {
292 rprintf(FLOG, "Invalid gid %s\n", p);
293 io_printf(f_out, "@ERROR: invalid gid %s\n", p);
300 /* TODO: If we're not root, but the configuration requests
301 * that we change to some uid other than the current one, then
304 /* TODO: Perhaps take a list of gids, and make them into the
305 * supplementary groups. */
307 exclude_path_prefix = use_chroot? "" : lp_path(i);
308 if (*exclude_path_prefix == '/' && !exclude_path_prefix[1])
309 exclude_path_prefix = "";
311 p = lp_include_from(i);
312 add_exclude_file(&server_exclude_list, p,
313 XFLG_FATAL_ERRORS | XFLG_DEF_INCLUDE);
316 add_exclude(&server_exclude_list, p,
317 XFLG_WORD_SPLIT | XFLG_DEF_INCLUDE);
319 p = lp_exclude_from(i);
320 add_exclude_file(&server_exclude_list, p,
324 add_exclude(&server_exclude_list, p, XFLG_WORD_SPLIT);
326 exclude_path_prefix = NULL;
332 * XXX: The 'use chroot' flag is a fairly reliable
333 * source of confusion, because it fails under two
334 * important circumstances: running as non-root,
335 * running on Win32 (or possibly others). On the
336 * other hand, if you are running as root, then it
337 * might be better to always use chroot.
339 * So, perhaps if we can't chroot we should just issue
340 * a warning, unless a "require chroot" flag is set,
341 * in which case we fail.
343 if (chroot(lp_path(i))) {
344 rsyserr(FLOG, errno, "chroot %s failed", lp_path(i));
345 io_printf(f_out, "@ERROR: chroot failed\n");
349 if (!push_dir("/")) {
350 rsyserr(FLOG, errno, "chdir %s failed\n", lp_path(i));
351 io_printf(f_out, "@ERROR: chdir failed\n");
356 if (!push_dir(lp_path(i))) {
357 rsyserr(FLOG, errno, "chdir %s failed\n", lp_path(i));
358 io_printf(f_out, "@ERROR: chdir failed\n");
365 /* XXXX: You could argue that if the daemon is started
366 * by a non-root user and they explicitly specify a
367 * gid, then we should try to change to that gid --
368 * this could be possible if it's already in their
369 * supplementary groups. */
371 /* TODO: Perhaps we need to document that if rsyncd is
372 * started by somebody other than root it will inherit
373 * all their supplementary groups. */
376 rsyserr(FLOG, errno, "setgid %d failed", (int)gid);
377 io_printf(f_out, "@ERROR: setgid failed\n");
380 #ifdef HAVE_SETGROUPS
381 /* Get rid of any supplementary groups this process
382 * might have inheristed. */
383 if (setgroups(1, &gid)) {
384 rsyserr(FLOG, errno, "setgroups failed");
385 io_printf(f_out, "@ERROR: setgroups failed\n");
391 rsyserr(FLOG, errno, "setuid %d failed", (int)uid);
392 io_printf(f_out, "@ERROR: setuid failed\n");
396 am_root = (MY_UID() == 0);
399 io_printf(f_out, "@RSYNCD: OK\n");
402 if (!(argv = new_array(char *, maxargs)))
403 out_of_memory("rsync_module");
404 argv[argc++] = "rsyncd";
407 if (!read_line(f_in, line, sizeof line - 1))
415 if (argc == maxargs) {
417 if (!(argv = realloc_array(argv, char *, maxargs)))
418 out_of_memory("rsync_module");
420 if (!(argv[argc] = strdup(p)))
421 out_of_memory("rsync_module");
424 if (start_glob == 1) {
428 glob_expand(name, &argv, &argc, &maxargs);
432 if (strcmp(line, ".") == 0)
437 ret = parse_arguments(&argc, (const char ***) &argp, 0);
439 if (filesfrom_fd == 0)
444 rprintf(FLOG, "rsync %s %s from %s@%s (%s)\n",
445 am_sender ? "on" : "to",
446 request, auth_user, host, addr);
448 rprintf(FLOG, "rsync %s %s from %s (%s)\n",
449 am_sender ? "on" : "to",
450 request, host, addr);
456 /* don't allow the logs to be flooded too fast */
457 if (verbose > lp_max_verbosity())
458 verbose = lp_max_verbosity();
461 if (protocol_version < 23
462 && (protocol_version == 22 || am_sender))
463 io_start_multiplex_out();
465 /* We have to get I/O multiplexing started so that we can
466 * get the error back to the client. This means getting
467 * the protocol setup finished first in later versions. */
468 setup_protocol(f_out, f_in);
469 if (files_from && !am_sender && strcmp(files_from, "-") != 0)
470 write_byte(f_out, 0);
471 io_start_multiplex_out();
477 exit_cleanup(RERR_UNSUPPORTED);
481 io_timeout = lp_timeout(i);
482 if (io_timeout < select_timeout)
483 select_timeout = io_timeout;
486 start_server(f_in, f_out, argc, argp);
491 /* send a list of available modules to the client. Don't list those
492 with "list = False". */
493 static void send_listing(int fd)
495 int n = lp_numservices();
498 for (i = 0; i < n; i++) {
500 io_printf(fd, "%-15s\t%s\n", lp_name(i), lp_comment(i));
503 if (protocol_version >= 25)
504 io_printf(fd,"@RSYNCD: EXIT\n");
507 /* this is called when a connection is established to a client
508 and we want to start talking. The setup of the system is done from
510 int start_daemon(int f_in, int f_out)
516 io_set_sock_fds(f_in, f_out);
518 if (!lp_load(config_file, 0))
519 exit_cleanup(RERR_SYNTAX);
524 set_socket_options(f_in, "SO_KEEPALIVE");
525 set_socket_options(f_in, lp_socket_options());
526 set_nonblocking(f_in);
529 io_printf(f_out, "@RSYNCD: %d\n", protocol_version);
531 motd = lp_motd_file();
533 FILE *f = fopen(motd,"r");
534 while (f && !feof(f)) {
535 int len = fread(line, 1, sizeof line - 1, f);
538 io_printf(f_out, "%s", line);
543 io_printf(f_out, "\n");
546 if (!read_line(f_in, line, sizeof line - 1))
549 if (sscanf(line,"@RSYNCD: %d", &remote_protocol) != 1) {
550 io_printf(f_out, "@ERROR: protocol startup error\n");
553 if (protocol_version > remote_protocol)
554 protocol_version = remote_protocol;
557 if (!read_line(f_in, line, sizeof line - 1))
560 if (!*line || strcmp(line, "#list") == 0) {
566 /* it's some sort of command that I don't understand */
567 io_printf(f_out, "@ERROR: Unknown command '%s'\n", line);
571 if ((i = lp_number(line)) < 0) {
572 char *addr = client_addr(f_in);
573 char *host = client_name(f_in);
574 rprintf(FLOG, "unknown module '%s' tried from %s (%s)\n",
576 io_printf(f_out, "@ERROR: Unknown module '%s'\n", line);
580 return rsync_module(f_in, f_out, i);
584 int daemon_main(void)
588 if (is_a_socket(STDIN_FILENO)) {
591 /* we are running via inetd - close off stdout and
592 * stderr so that library functions (and getopt) don't
593 * try to use them. Redirect them to /dev/null */
594 for (i = 1; i < 3; i++) {
596 open("/dev/null", O_RDWR);
599 return start_daemon(STDIN_FILENO, STDIN_FILENO);
605 if (!lp_load(config_file, 1))
606 exit_cleanup(RERR_SYNTAX);
608 if (rsync_port == 0 && (rsync_port = lp_rsync_port()) == 0)
609 rsync_port = RSYNC_PORT;
610 if (bind_address == NULL && *lp_bind_address())
611 bind_address = lp_bind_address();
615 rprintf(FLOG, "rsyncd version %s starting, listening on port %d\n",
616 RSYNC_VERSION, rsync_port);
617 /* TODO: If listening on a particular address, then show that
618 * address too. In fact, why not just do inet_ntop on the
619 * local address??? */
621 if (((pid_file = lp_pid_file()) != NULL) && (*pid_file != '\0')) {
624 pid_t pid = getpid();
625 cleanup_set_pid(pid);
626 if ((fd = do_open(lp_pid_file(), O_WRONLY|O_CREAT|O_TRUNC,
627 0666 & ~orig_umask)) == -1) {
629 rsyserr(FLOG, errno, "failed to create pid file %s", pid_file);
630 exit_cleanup(RERR_FILEIO);
632 snprintf(pidbuf, sizeof pidbuf, "%ld\n", (long)pid);
633 write(fd, pidbuf, strlen(pidbuf));
637 start_accept_loop(rsync_port, start_daemon);