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 orig_umask;
48 extern int default_af_hint;
49 extern char *bind_address;
50 extern struct exclude_list_struct server_exclude_list;
51 extern char *exclude_path_prefix;
52 extern char *config_file;
57 * Run a client connected to an rsyncd. The alternative to this
58 * function for remote-shell connections is do_cmd().
60 * After negotiating which module to use and reading the server's
61 * motd, this hands over to client_run(). Telling the server the
62 * module will cause it to chroot/setuid/etc.
64 * Instead of doing a transfer, the client may at this stage instead
65 * get a listing of remote modules and exit.
67 * @return -1 for error in startup, or the result of client_run().
68 * Either way, it eventually gets passed to exit_cleanup().
70 int start_socket_client(char *host, char *path, int argc, char *argv[])
73 char *p, *user = NULL;
75 /* this is redundant with code in start_inband_exchange(), but
76 * this short-circuits a problem before we open a socket, and
77 * the extra check won't hurt */
79 rprintf(FERROR,"ERROR: The remote path must start with a module name not a /\n");
83 p = strchr(host, '@');
90 fd = open_socket_out_wrapped(host, rsync_port, bind_address,
93 exit_cleanup(RERR_SOCKETIO);
95 ret = start_inband_exchange(user, path, fd, fd, argc);
97 return ret < 0? ret : client_run(fd, fd, -1, argc, argv);
100 int start_inband_exchange(char *user, char *path, int f_in, int f_out, int argc)
103 char *sargs[MAX_ARGS];
105 char line[MAXPATHLEN];
108 if (argc == 0 && !am_sender)
112 rprintf(FERROR, "ERROR: The remote path must start with a module name\n");
117 user = getenv("USER");
119 user = getenv("LOGNAME");
121 /* set daemon_over_rsh to false since we need to build the
122 * true set of args passed through the rsh/ssh connection;
123 * this is a no-op for direct-socket-connection mode */
125 server_options(sargs, &sargc);
127 sargs[sargc++] = ".";
130 sargs[sargc++] = path;
134 io_printf(f_out, "@RSYNCD: %d\n", protocol_version);
136 if (!read_line(f_in, line, sizeof line - 1)) {
137 rprintf(FERROR, "rsync: did not see server greeting\n");
141 if (sscanf(line,"@RSYNCD: %d", &remote_protocol) != 1) {
142 /* note that read_line strips of \n or \r */
143 rprintf(FERROR, "rsync: server sent \"%s\" rather than greeting\n",
147 if (protocol_version > remote_protocol)
148 protocol_version = remote_protocol;
150 p = strchr(path,'/');
152 io_printf(f_out, "%s\n", path);
155 /* Old servers may just drop the connection here,
156 rather than sending a proper EXIT command. Yuck. */
157 kludge_around_eof = list_only && (protocol_version < 25);
160 if (!read_line(f_in, line, sizeof line - 1)) {
161 rprintf(FERROR, "rsync: didn't get server startup line\n");
165 if (strncmp(line,"@RSYNCD: AUTHREQD ",18) == 0) {
166 auth_client(f_out, user, line+18);
170 if (strcmp(line,"@RSYNCD: OK") == 0)
173 if (strcmp(line,"@RSYNCD: EXIT") == 0) {
174 /* This is sent by recent versions of the
175 * server to terminate the listing of modules.
176 * We don't want to go on and transfer
177 * anything; just exit. */
181 if (strncmp(line, "@ERROR", 6) == 0) {
182 rprintf(FERROR,"%s\n", line);
183 /* This is always fatal; the server will now
184 * close the socket. */
185 return RERR_STARTCLIENT;
187 rprintf(FINFO,"%s\n", line);
190 kludge_around_eof = False;
192 for (i = 0; i < sargc; i++) {
193 io_printf(f_out, "%s\n", sargs[i]);
195 io_printf(f_out, "\n");
197 if (protocol_version < 23) {
198 if (protocol_version == 22 || !am_sender)
199 io_start_multiplex_in(f_in);
207 static int rsync_module(int f_in, int f_out, int i)
213 char line[MAXPATHLEN];
214 uid_t uid = (uid_t)-2; /* canonically "nobody" */
215 gid_t gid = (gid_t)-2;
217 char *addr = client_addr(f_in);
218 char *host = client_name(f_in);
219 char *name = lp_name(i);
220 int use_chroot = lp_use_chroot(i);
223 char *request = NULL;
225 if (!allow_access(addr, host, lp_hosts_allow(i), lp_hosts_deny(i))) {
226 rprintf(FERROR,"rsync denied on module %s from %s (%s)\n",
228 io_printf(f_out, "@ERROR: access denied to %s from %s (%s)\n",
233 if (am_daemon && am_server) {
234 rprintf(FLOG, "rsync allowed access on module %s from %s (%s)\n",
238 if (!claim_connection(lp_lock_file(i), lp_max_connections(i))) {
240 rsyserr(FERROR, errno, "failed to open lock file %s",
242 io_printf(f_out, "@ERROR: failed to open lock file %s\n",
245 rprintf(FERROR,"max connections (%d) reached\n",
246 lp_max_connections(i));
247 io_printf(f_out, "@ERROR: max connections (%d) reached - try again later\n",
248 lp_max_connections(i));
253 auth_user = auth_server(f_in, f_out, i, addr, "@RSYNCD: AUTHREQD ");
256 rprintf(FERROR,"auth failed on module %s from %s (%s)\n",
258 io_printf(f_out, "@ERROR: auth failed on module %s\n", name);
264 am_root = (MY_UID() == 0);
268 if (!name_to_uid(p, &uid)) {
269 if (!isdigit(*(unsigned char *)p)) {
270 rprintf(FERROR,"Invalid uid %s\n", p);
271 io_printf(f_out, "@ERROR: invalid uid %s\n", p);
278 if (!name_to_gid(p, &gid)) {
279 if (!isdigit(*(unsigned char *)p)) {
280 rprintf(FERROR,"Invalid gid %s\n", p);
281 io_printf(f_out, "@ERROR: invalid gid %s\n", p);
288 /* TODO: If we're not root, but the configuration requests
289 * that we change to some uid other than the current one, then
292 /* TODO: Perhaps take a list of gids, and make them into the
293 * supplementary groups. */
295 exclude_path_prefix = use_chroot? "" : lp_path(i);
296 if (*exclude_path_prefix == '/' && !exclude_path_prefix[1])
297 exclude_path_prefix = "";
299 p = lp_include_from(i);
300 add_exclude_file(&server_exclude_list, p,
301 XFLG_FATAL_ERRORS | XFLG_DEF_INCLUDE);
304 add_exclude(&server_exclude_list, p,
305 XFLG_WORD_SPLIT | XFLG_DEF_INCLUDE);
307 p = lp_exclude_from(i);
308 add_exclude_file(&server_exclude_list, p,
312 add_exclude(&server_exclude_list, p, XFLG_WORD_SPLIT);
314 exclude_path_prefix = NULL;
320 * XXX: The 'use chroot' flag is a fairly reliable
321 * source of confusion, because it fails under two
322 * important circumstances: running as non-root,
323 * running on Win32 (or possibly others). On the
324 * other hand, if you are running as root, then it
325 * might be better to always use chroot.
327 * So, perhaps if we can't chroot we should just issue
328 * a warning, unless a "require chroot" flag is set,
329 * in which case we fail.
331 if (chroot(lp_path(i))) {
332 rsyserr(FERROR, errno, "chroot %s failed", lp_path(i));
333 io_printf(f_out, "@ERROR: chroot failed\n");
337 if (!push_dir("/")) {
338 rsyserr(FERROR, errno, "chdir %s failed\n", lp_path(i));
339 io_printf(f_out, "@ERROR: chdir failed\n");
344 if (!push_dir(lp_path(i))) {
345 rsyserr(FERROR, errno, "chdir %s failed\n", lp_path(i));
346 io_printf(f_out, "@ERROR: chdir failed\n");
353 /* XXXX: You could argue that if the daemon is started
354 * by a non-root user and they explicitly specify a
355 * gid, then we should try to change to that gid --
356 * this could be possible if it's already in their
357 * supplementary groups. */
359 /* TODO: Perhaps we need to document that if rsyncd is
360 * started by somebody other than root it will inherit
361 * all their supplementary groups. */
364 rsyserr(FERROR, errno, "setgid %d failed", (int)gid);
365 io_printf(f_out, "@ERROR: setgid failed\n");
368 #ifdef HAVE_SETGROUPS
369 /* Get rid of any supplementary groups this process
370 * might have inheristed. */
371 if (setgroups(1, &gid)) {
372 rsyserr(FERROR, errno, "setgroups failed");
373 io_printf(f_out, "@ERROR: setgroups failed\n");
379 rsyserr(FERROR, errno, "setuid %d failed", (int)uid);
380 io_printf(f_out, "@ERROR: setuid failed\n");
384 am_root = (MY_UID() == 0);
387 io_printf(f_out, "@RSYNCD: OK\n");
390 if (!(argv = new_array(char *, maxargs)))
391 out_of_memory("rsync_module");
392 argv[argc++] = "rsyncd";
395 if (!read_line(f_in, line, sizeof line - 1))
403 if (argc == maxargs) {
405 if (!(argv = realloc_array(argv, char *, maxargs)))
406 out_of_memory("rsync_module");
408 if (!(argv[argc] = strdup(p)))
409 out_of_memory("rsync_module");
412 if (start_glob == 1) {
416 glob_expand(name, &argv, &argc, &maxargs);
420 if (strcmp(line, ".") == 0)
425 ret = parse_arguments(&argc, (const char ***) &argp, 0);
427 if (filesfrom_fd == 0)
432 rprintf(FLOG, "rsync %s %s from %s@%s (%s)\n",
433 am_sender ? "on" : "to",
434 request, auth_user, host, addr);
436 rprintf(FLOG, "rsync %s %s from %s (%s)\n",
437 am_sender ? "on" : "to",
438 request, host, addr);
444 /* don't allow the logs to be flooded too fast */
445 if (verbose > lp_max_verbosity())
446 verbose = lp_max_verbosity();
449 if (protocol_version < 23) {
450 if (protocol_version == 22 || am_sender)
451 io_start_multiplex_out(f_out);
454 /* For later protocol versions, we don't start multiplexing
455 * until we've configured nonblocking in start_server. That
456 * means we're in a sticky situation now: there's no way to
457 * convey errors to the client. */
459 /* FIXME: Hold off on reporting option processing errors until
460 * we've set up nonblocking and multiplexed IO and can get the
461 * message back to them. */
464 exit_cleanup(RERR_UNSUPPORTED);
468 io_timeout = lp_timeout(i);
470 start_server(f_in, f_out, argc, argp);
475 /* send a list of available modules to the client. Don't list those
476 with "list = False". */
477 static void send_listing(int fd)
479 int n = lp_numservices();
482 for (i = 0; i < n; i++)
484 io_printf(fd, "%-15s\t%s\n", lp_name(i), lp_comment(i));
486 if (protocol_version >= 25)
487 io_printf(fd,"@RSYNCD: EXIT\n");
490 /* this is called when a connection is established to a client
491 and we want to start talking. The setup of the system is done from
493 int start_daemon(int f_in, int f_out)
499 if (!lp_load(config_file, 0))
500 exit_cleanup(RERR_SYNTAX);
505 set_socket_options(f_in, "SO_KEEPALIVE");
506 set_socket_options(f_in, lp_socket_options());
507 set_nonblocking(f_in);
510 io_printf(f_out, "@RSYNCD: %d\n", protocol_version);
512 motd = lp_motd_file();
514 FILE *f = fopen(motd,"r");
515 while (f && !feof(f)) {
516 int len = fread(line, 1, sizeof line - 1, f);
519 io_printf(f_out, "%s", line);
524 io_printf(f_out, "\n");
527 if (!read_line(f_in, line, sizeof line - 1))
530 if (sscanf(line,"@RSYNCD: %d", &remote_protocol) != 1) {
531 io_printf(f_out, "@ERROR: protocol startup error\n");
534 if (protocol_version > remote_protocol)
535 protocol_version = remote_protocol;
539 if (!read_line(f_in, line, sizeof line - 1))
542 if (!*line || strcmp(line,"#list") == 0) {
548 /* it's some sort of command that I don't understand */
549 io_printf(f_out, "@ERROR: Unknown command '%s'\n", line);
555 io_printf(f_out, "@ERROR: Unknown module '%s'\n", line);
560 return rsync_module(f_in, f_out, i);
564 int daemon_main(void)
568 if (is_a_socket(STDIN_FILENO)) {
571 /* we are running via inetd - close off stdout and
572 * stderr so that library functions (and getopt) don't
573 * try to use them. Redirect them to /dev/null */
574 for (i = 1; i < 3; i++) {
576 open("/dev/null", O_RDWR);
579 return start_daemon(STDIN_FILENO, STDIN_FILENO);
585 if (!lp_load(config_file, 1))
586 exit_cleanup(RERR_SYNTAX);
590 rprintf(FLOG, "rsyncd version %s starting, listening on port %d\n",
591 RSYNC_VERSION, rsync_port);
592 /* TODO: If listening on a particular address, then show that
593 * address too. In fact, why not just do inet_ntop on the
594 * local address??? */
596 if (((pid_file = lp_pid_file()) != NULL) && (*pid_file != '\0')) {
599 pid_t pid = getpid();
600 cleanup_set_pid(pid);
601 if ((fd = do_open(lp_pid_file(), O_WRONLY|O_CREAT|O_TRUNC,
602 0666 & ~orig_umask)) == -1) {
604 rsyserr(FLOG, errno, "failed to create pid file %s", pid_file);
605 exit_cleanup(RERR_FILEIO);
607 snprintf(pidbuf, sizeof pidbuf, "%ld\n", (long)pid);
608 write(fd, pidbuf, strlen(pidbuf));
612 start_accept_loop(rsync_port, start_daemon);