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
36 extern int rsync_port;
37 extern int kluge_around_eof;
38 extern int daemon_over_rsh;
39 extern int sanitize_paths;
40 extern int filesfrom_fd;
41 extern int remote_protocol;
42 extern int protocol_version;
43 extern int io_timeout;
44 extern int orig_umask;
46 extern int default_af_hint;
47 extern char *bind_address;
48 extern struct filter_list_struct server_filter_list;
49 extern char *config_file;
50 extern char *files_from;
54 int daemon_log_format_has_i = 0;
55 int daemon_log_format_has_o_or_i = 0;
58 /* Length of lp_path() string when in daemon mode & not chrooted, else 0. */
59 unsigned int module_dirlen = 0;
62 * Run a client connected to an rsyncd. The alternative to this
63 * function for remote-shell connections is do_cmd().
65 * After negotiating which module to use and reading the server's
66 * motd, this hands over to client_run(). Telling the server the
67 * module will cause it to chroot/setuid/etc.
69 * Instead of doing a transfer, the client may at this stage instead
70 * get a listing of remote modules and exit.
72 * @return -1 for error in startup, or the result of client_run().
73 * Either way, it eventually gets passed to exit_cleanup().
75 int start_socket_client(char *host, char *path, int argc, char *argv[])
78 char *p, *user = NULL;
80 /* This is redundant with code in start_inband_exchange(), but this
81 * short-circuits a problem in the client before we open a socket,
82 * and the extra check won't hurt. */
85 "ERROR: The remote path must start with a module name not a /\n");
89 if ((p = strrchr(host, '@')) != NULL) {
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 ? 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[BIGPATHBUFLEN];
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 io_printf(f_out, "@RSYNCD: %d\n", protocol_version);
130 if (!read_line(f_in, line, sizeof line - 1)) {
131 rprintf(FERROR, "rsync: did not see server greeting\n");
135 if (sscanf(line,"@RSYNCD: %d", &remote_protocol) != 1) {
136 /* note that read_line strips of \n or \r */
137 rprintf(FERROR, "rsync: server sent \"%s\" rather than greeting\n",
141 if (protocol_version > remote_protocol)
142 protocol_version = remote_protocol;
144 if (list_only && protocol_version >= 29)
147 /* set daemon_over_rsh to false since we need to build the
148 * true set of args passed through the rsh/ssh connection;
149 * this is a no-op for direct-socket-connection mode */
151 server_options(sargs, &sargc);
153 sargs[sargc++] = ".";
156 sargs[sargc++] = path;
161 print_child_argv(sargs);
163 p = strchr(path,'/');
165 io_printf(f_out, "%s\n", path);
168 /* Old servers may just drop the connection here,
169 rather than sending a proper EXIT command. Yuck. */
170 kluge_around_eof = list_only && protocol_version < 25 ? 1 : 0;
173 if (!read_line(f_in, line, sizeof line - 1)) {
174 rprintf(FERROR, "rsync: didn't get server startup line\n");
178 if (strncmp(line,"@RSYNCD: AUTHREQD ",18) == 0) {
179 auth_client(f_out, user, line+18);
183 if (strcmp(line,"@RSYNCD: OK") == 0)
186 if (strcmp(line,"@RSYNCD: EXIT") == 0) {
187 /* This is sent by recent versions of the
188 * server to terminate the listing of modules.
189 * We don't want to go on and transfer
190 * anything; just exit. */
194 if (strncmp(line, "@ERROR", 6) == 0) {
195 rprintf(FERROR, "%s\n", line);
196 /* This is always fatal; the server will now
197 * close the socket. */
201 rprintf(FINFO, "%s\n", line);
203 kluge_around_eof = 0;
205 for (i = 0; i < sargc; i++) {
206 io_printf(f_out, "%s\n", sargs[i]);
208 io_printf(f_out, "\n");
210 if (protocol_version < 23) {
211 if (protocol_version == 22 || !am_sender)
212 io_start_multiplex_in();
220 static int rsync_module(int f_in, int f_out, int i)
225 char line[BIGPATHBUFLEN];
226 uid_t uid = (uid_t)-2; /* canonically "nobody" */
227 gid_t gid = (gid_t)-2;
232 char *addr = client_addr(f_in);
233 char *host = client_name(f_in);
234 char *name = lp_name(i);
235 int use_chroot = lp_use_chroot(i);
238 char *request = NULL;
240 if (!allow_access(addr, host, lp_hosts_allow(i), lp_hosts_deny(i))) {
241 rprintf(FLOG, "rsync denied on module %s from %s (%s)\n",
244 io_printf(f_out, "@ERROR: Unknown module '%s'\n", name);
247 "@ERROR: access denied to %s from %s (%s)\n",
253 if (am_daemon && am_server) {
254 rprintf(FLOG, "rsync allowed access on module %s from %s (%s)\n",
258 if (!claim_connection(lp_lock_file(i), lp_max_connections(i))) {
260 rsyserr(FLOG, errno, "failed to open lock file %s",
261 safe_fname(lp_lock_file(i)));
262 io_printf(f_out, "@ERROR: failed to open lock file\n");
264 rprintf(FLOG, "max connections (%d) reached\n",
265 lp_max_connections(i));
266 io_printf(f_out, "@ERROR: max connections (%d) reached -- try again later\n",
267 lp_max_connections(i));
272 auth_user = auth_server(f_in, f_out, i, host, addr, "@RSYNCD: AUTHREQD ");
275 io_printf(f_out, "@ERROR: auth failed on module %s\n", name);
284 if (lp_transfer_logging(i)) {
285 if (log_format_has(lp_log_format(i), 'i'))
286 daemon_log_format_has_i = 1;
287 if (daemon_log_format_has_i
288 || log_format_has(lp_log_format(i), 'o'))
289 daemon_log_format_has_o_or_i = 1;
292 am_root = (MY_UID() == 0);
296 if (!name_to_uid(p, &uid)) {
297 if (!isdigit(*(unsigned char *)p)) {
298 rprintf(FLOG, "Invalid uid %s\n", p);
299 io_printf(f_out, "@ERROR: invalid uid %s\n", p);
306 if (!name_to_gid(p, &gid)) {
307 if (!isdigit(*(unsigned char *)p)) {
308 rprintf(FLOG, "Invalid gid %s\n", p);
309 io_printf(f_out, "@ERROR: invalid gid %s\n", p);
316 /* TODO: If we're not root, but the configuration requests
317 * that we change to some uid other than the current one, then
320 /* TODO: Perhaps take a list of gids, and make them into the
321 * supplementary groups. */
323 if (use_chroot || (module_dirlen = strlen(lp_path(i))) == 1) {
325 set_filter_dir("/", 1);
327 set_filter_dir(lp_path(i), module_dirlen);
330 parse_rule(&server_filter_list, p, MATCHFLG_WORD_SPLIT,
333 p = lp_include_from(i);
334 parse_filter_file(&server_filter_list, p, MATCHFLG_INCLUDE,
335 XFLG_ANCHORED2ABS | XFLG_OLD_PREFIXES | XFLG_FATAL_ERRORS);
338 parse_rule(&server_filter_list, p,
339 MATCHFLG_INCLUDE | MATCHFLG_WORD_SPLIT,
340 XFLG_ANCHORED2ABS | XFLG_OLD_PREFIXES);
342 p = lp_exclude_from(i);
343 parse_filter_file(&server_filter_list, p, 0,
344 XFLG_ANCHORED2ABS | XFLG_OLD_PREFIXES | XFLG_FATAL_ERRORS);
347 parse_rule(&server_filter_list, p, MATCHFLG_WORD_SPLIT,
348 XFLG_ANCHORED2ABS | XFLG_OLD_PREFIXES);
353 s = lp_prexfer_exec(i);
354 p = lp_postxfer_exec(i);
355 if ((s && *s) || (p && *p)) {
356 char *modname, *modpath, *hostaddr, *hostname, *username;
358 if (asprintf(&modname, "RSYNC_MODULE_NAME=%s", name) < 0
359 || asprintf(&modpath, "RSYNC_MODULE_PATH=%s", lp_path(i)) < 0
360 || asprintf(&hostaddr, "RSYNC_HOST_ADDR=%s", addr) < 0
361 || asprintf(&hostname, "RSYNC_HOST_NAME=%s", host) < 0
362 || asprintf(&username, "RSYNC_USER_NAME=%s", auth_user) < 0)
363 out_of_memory("rsync_module");
372 if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
373 rprintf(FLOG, "prexfer-exec failed\n");
374 io_printf(f_out, "@ERROR: prexfer-exec failed\n");
381 rsyserr(FLOG, errno, "fork failed");
382 io_printf(f_out, "@ERROR: fork failed\n");
387 waitpid(pid, &status, 0);
388 if (asprintf(&ret1, "RSYNC_RAW_STATUS=%d", status) > 0)
390 if (WIFEXITED(status))
391 status = WEXITSTATUS(status);
394 if (asprintf(&ret2, "RSYNC_EXIT_STATUS=%d", status) > 0)
406 * XXX: The 'use chroot' flag is a fairly reliable
407 * source of confusion, because it fails under two
408 * important circumstances: running as non-root,
409 * running on Win32 (or possibly others). On the
410 * other hand, if you are running as root, then it
411 * might be better to always use chroot.
413 * So, perhaps if we can't chroot we should just issue
414 * a warning, unless a "require chroot" flag is set,
415 * in which case we fail.
417 if (chroot(lp_path(i))) {
418 rsyserr(FLOG, errno, "chroot %s failed",
419 safe_fname(lp_path(i)));
420 io_printf(f_out, "@ERROR: chroot failed\n");
424 if (!push_dir("/")) {
425 rsyserr(FLOG, errno, "chdir %s failed\n",
426 safe_fname(lp_path(i)));
427 io_printf(f_out, "@ERROR: chdir failed\n");
432 if (!push_dir(lp_path(i))) {
433 rsyserr(FLOG, errno, "chdir %s failed\n",
434 safe_fname(lp_path(i)));
435 io_printf(f_out, "@ERROR: chdir failed\n");
442 /* XXXX: You could argue that if the daemon is started
443 * by a non-root user and they explicitly specify a
444 * gid, then we should try to change to that gid --
445 * this could be possible if it's already in their
446 * supplementary groups. */
448 /* TODO: Perhaps we need to document that if rsyncd is
449 * started by somebody other than root it will inherit
450 * all their supplementary groups. */
453 rsyserr(FLOG, errno, "setgid %d failed", (int)gid);
454 io_printf(f_out, "@ERROR: setgid failed\n");
457 #ifdef HAVE_SETGROUPS
458 /* Get rid of any supplementary groups this process
459 * might have inheristed. */
460 if (setgroups(1, &gid)) {
461 rsyserr(FLOG, errno, "setgroups failed");
462 io_printf(f_out, "@ERROR: setgroups failed\n");
468 rsyserr(FLOG, errno, "setuid %d failed", (int)uid);
469 io_printf(f_out, "@ERROR: setuid failed\n");
473 am_root = (MY_UID() == 0);
476 io_printf(f_out, "@RSYNCD: OK\n");
479 if (!(argv = new_array(char *, maxargs)))
480 out_of_memory("rsync_module");
481 argv[argc++] = "rsyncd";
484 if (!read_line(f_in, line, sizeof line - 1))
492 if (argc == maxargs) {
494 if (!(argv = realloc_array(argv, char *, maxargs)))
495 out_of_memory("rsync_module");
497 if (!(argv[argc] = strdup(p)))
498 out_of_memory("rsync_module");
500 switch (start_glob) {
503 if (strcmp(line, ".") == 0)
511 glob_expand(name, &argv, &argc, &maxargs);
516 verbose = 0; /* future verbosity is controlled by client options */
517 ret = parse_arguments(&argc, (const char ***) &argv, 0);
519 if (filesfrom_fd == 0)
524 rprintf(FLOG, "rsync %s %s from %s@%s (%s)\n",
525 am_sender ? "on" : "to",
526 request, auth_user, host, addr);
528 rprintf(FLOG, "rsync %s %s from %s (%s)\n",
529 am_sender ? "on" : "to",
530 request, host, addr);
536 /* don't allow the logs to be flooded too fast */
537 if (verbose > lp_max_verbosity(i))
538 verbose = lp_max_verbosity(i);
541 if (protocol_version < 23
542 && (protocol_version == 22 || am_sender))
543 io_start_multiplex_out();
545 /* We have to get I/O multiplexing started so that we can
546 * get the error back to the client. This means getting
547 * the protocol setup finished first in later versions. */
548 setup_protocol(f_out, f_in);
550 /* Since we failed in our option parsing, we may not
551 * have finished parsing that the client sent us a
552 * --files-from option, so look for it manually.
553 * Without this, the socket would be in the wrong
554 * state for the upcoming error message. */
557 for (i = 0; i < argc; i++) {
558 if (strncmp(argv[i], "--files-from", 12) == 0) {
565 write_byte(f_out, 0);
567 io_start_multiplex_out();
573 exit_cleanup(RERR_UNSUPPORTED);
576 if (lp_timeout(i) && lp_timeout(i) > io_timeout)
577 set_io_timeout(lp_timeout(i));
579 start_server(f_in, f_out, argc, argv);
584 /* send a list of available modules to the client. Don't list those
585 with "list = False". */
586 static void send_listing(int fd)
588 int n = lp_numservices();
591 for (i = 0; i < n; i++) {
593 io_printf(fd, "%-15s\t%s\n", lp_name(i), lp_comment(i));
596 if (protocol_version >= 25)
597 io_printf(fd,"@RSYNCD: EXIT\n");
600 /* this is called when a connection is established to a client
601 and we want to start talking. The setup of the system is done from
603 int start_daemon(int f_in, int f_out)
609 io_set_sock_fds(f_in, f_out);
611 if (!lp_load(config_file, 0))
612 exit_cleanup(RERR_SYNTAX);
617 set_socket_options(f_in, "SO_KEEPALIVE");
618 set_socket_options(f_in, lp_socket_options());
619 set_nonblocking(f_in);
622 io_printf(f_out, "@RSYNCD: %d\n", protocol_version);
624 motd = lp_motd_file();
626 FILE *f = fopen(motd,"r");
627 while (f && !feof(f)) {
628 int len = fread(line, 1, sizeof line - 1, f);
631 io_printf(f_out, "%s", line);
636 io_printf(f_out, "\n");
639 if (!read_line(f_in, line, sizeof line - 1))
642 if (sscanf(line,"@RSYNCD: %d", &remote_protocol) != 1) {
643 io_printf(f_out, "@ERROR: protocol startup error\n");
646 if (protocol_version > remote_protocol)
647 protocol_version = remote_protocol;
650 if (!read_line(f_in, line, sizeof line - 1))
653 if (!*line || strcmp(line, "#list") == 0) {
659 /* it's some sort of command that I don't understand */
660 io_printf(f_out, "@ERROR: Unknown command '%s'\n", line);
664 if ((i = lp_number(line)) < 0) {
665 char *addr = client_addr(f_in);
666 char *host = client_name(f_in);
667 rprintf(FLOG, "unknown module '%s' tried from %s (%s)\n",
669 io_printf(f_out, "@ERROR: Unknown module '%s'\n", line);
673 return rsync_module(f_in, f_out, i);
677 int daemon_main(void)
681 if (is_a_socket(STDIN_FILENO)) {
684 /* we are running via inetd - close off stdout and
685 * stderr so that library functions (and getopt) don't
686 * try to use them. Redirect them to /dev/null */
687 for (i = 1; i < 3; i++) {
689 open("/dev/null", O_RDWR);
692 return start_daemon(STDIN_FILENO, STDIN_FILENO);
698 if (!lp_load(config_file, 1))
699 exit_cleanup(RERR_SYNTAX);
701 if (rsync_port == 0 && (rsync_port = lp_rsync_port()) == 0)
702 rsync_port = RSYNC_PORT;
703 if (bind_address == NULL && *lp_bind_address())
704 bind_address = lp_bind_address();
708 rprintf(FLOG, "rsyncd version %s starting, listening on port %d\n",
709 RSYNC_VERSION, rsync_port);
710 /* TODO: If listening on a particular address, then show that
711 * address too. In fact, why not just do inet_ntop on the
712 * local address??? */
714 if (((pid_file = lp_pid_file()) != NULL) && (*pid_file != '\0')) {
717 pid_t pid = getpid();
718 cleanup_set_pid(pid);
719 if ((fd = do_open(lp_pid_file(), O_WRONLY|O_CREAT|O_TRUNC,
720 0666 & ~orig_umask)) == -1) {
722 rsyserr(FLOG, errno, "failed to create pid file %s",
723 safe_fname(pid_file));
724 exit_cleanup(RERR_FILEIO);
726 snprintf(pidbuf, sizeof pidbuf, "%ld\n", (long)pid);
727 write(fd, pidbuf, strlen(pidbuf));
731 start_accept_loop(rsync_port, start_daemon);