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 negotiating which module to use and reading the server's
42 * motd, this hands over to client_run(). Telling the server the
43 * module will cause it to chroot/setuid/etc.
45 * Instead of doing a transfer, the client may at this stage instead
46 * get a listing of remote modules and exit.
48 * @return -1 for error in startup, or the result of client_run().
49 * Either way, it eventually gets passed to exit_cleanup().
51 int start_socket_client(char *host, char *path, int argc, char *argv[])
54 char *sargs[MAX_ARGS];
56 char line[MAXPATHLEN];
58 extern int remote_version;
60 extern char *shell_cmd;
62 extern int kludge_around_eof;
63 extern char *bind_address;
64 extern int default_af_hint;
66 if (argc == 0 && !am_sender) {
71 /* This is just a friendliness enhancement: if the connection
72 * is to an rsyncd then there is no point specifying the -e option.
73 * Note that this is only set if the -e was explicitly specified,
74 * not if the environment variable just happens to be set.
75 * See http://lists.samba.org/pipermail/rsync/2000-September/002744.html
78 rprintf(FERROR, "WARNING: --rsh or -e option ignored when "
79 "connecting to rsync daemon\n");
84 rprintf(FERROR,"ERROR: The remote path must start with a module name not a /\n");
88 p = strchr(host, '@');
95 if (!user) user = getenv("USER");
96 if (!user) user = getenv("LOGNAME");
99 /* FIXME: If we're going to use a socket program for
100 * testing, then this message is wrong. We need to
101 * say something like "(except really using %s)" */
102 rprintf(FINFO, "opening tcp connection to %s port %d\n",
105 fd = open_socket_out_wrapped (host, rsync_port, bind_address,
108 exit_cleanup(RERR_SOCKETIO);
111 server_options(sargs,&sargc);
113 sargs[sargc++] = ".";
116 sargs[sargc++] = path;
120 io_printf(fd,"@RSYNCD: %d\n", PROTOCOL_VERSION);
122 if (!read_line(fd, line, sizeof(line)-1)) {
123 rprintf(FERROR, "rsync: did not see server greeting\n");
127 if (sscanf(line,"@RSYNCD: %d", &remote_version) != 1) {
128 /* note that read_line strips of \n or \r */
129 rprintf(FERROR, "rsync: server sent \"%s\" rather than greeting\n",
134 p = strchr(path,'/');
136 io_printf(fd,"%s\n",path);
139 /* Old servers may just drop the connection here,
140 rather than sending a proper EXIT command. Yuck. */
141 kludge_around_eof = list_only && (remote_version < 25);
144 if (!read_line(fd, line, sizeof(line)-1)) {
145 rprintf(FERROR, "rsync: didn't get server startup line\n");
149 if (strncmp(line,"@RSYNCD: AUTHREQD ",18) == 0) {
150 auth_client(fd, user, line+18);
154 if (strcmp(line,"@RSYNCD: OK") == 0) break;
156 if (strcmp(line,"@RSYNCD: EXIT") == 0) {
157 /* This is sent by recent versions of the
158 * server to terminate the listing of modules.
159 * We don't want to go on and transfer
160 * anything; just exit. */
164 if (strncmp(line, "@ERROR", 6) == 0) {
165 rprintf(FERROR,"%s\n", line);
166 /* This is always fatal; the server will now
167 * close the socket. */
168 return RERR_STARTCLIENT;
170 rprintf(FINFO,"%s\n", line);
173 kludge_around_eof = False;
175 for (i=0;i<sargc;i++) {
176 io_printf(fd,"%s\n", sargs[i]);
180 if (remote_version < 23) {
181 if (remote_version == 22 || (remote_version > 17 && !am_sender))
182 io_start_multiplex_in(fd);
185 return client_run(fd, fd, -1, argc, argv);
190 static int rsync_module(int fd, int i)
193 char *argv[MAX_ARGS];
195 char line[MAXPATHLEN];
196 uid_t uid = (uid_t)-2; /* canonically "nobody" */
197 gid_t gid = (gid_t)-2;
199 char *addr = client_addr(fd);
200 char *host = client_name(fd);
201 char *name = lp_name(i);
202 int use_chroot = lp_use_chroot(i);
206 extern int am_sender;
207 extern int remote_version;
210 if (!allow_access(addr, host, lp_hosts_allow(i), lp_hosts_deny(i))) {
211 rprintf(FERROR,"rsync denied on module %s from %s (%s)\n",
213 io_printf(fd,"@ERROR: access denied to %s from %s (%s)\n",
218 if (!claim_connection(lp_lock_file(i), lp_max_connections(i))) {
220 rprintf(FERROR,"failed to open lock file %s : %s\n",
221 lp_lock_file(i), strerror(errno));
222 io_printf(fd,"@ERROR: failed to open lock file %s : %s\n",
223 lp_lock_file(i), strerror(errno));
225 rprintf(FERROR,"max connections (%d) reached\n",
226 lp_max_connections(i));
227 io_printf(fd,"@ERROR: max connections (%d) reached - try again later\n", lp_max_connections(i));
233 auth_user = auth_server(fd, i, addr, "@RSYNCD: AUTHREQD ");
236 rprintf(FERROR,"auth failed on module %s from %s (%s)\n",
237 name, client_name(fd), client_addr(fd));
238 io_printf(fd,"@ERROR: auth failed on module %s\n",name);
244 am_root = (getuid() == 0);
248 if (!name_to_uid(p, &uid)) {
249 if (!isdigit(* (unsigned char *) p)) {
250 rprintf(FERROR,"Invalid uid %s\n", p);
251 io_printf(fd,"@ERROR: invalid uid %s\n", p);
258 if (!name_to_gid(p, &gid)) {
259 if (!isdigit(* (unsigned char *) p)) {
260 rprintf(FERROR,"Invalid gid %s\n", p);
261 io_printf(fd,"@ERROR: invalid gid %s\n", p);
268 /* TODO: If we're not root, but the configuration requests
269 * that we change to some uid other than the current one, then
272 /* TODO: Perhaps take a list of gids, and make them into the
273 * supplementary groups. */
275 p = lp_include_from(i);
276 add_exclude_file(p, 1, 1);
281 p = lp_exclude_from(i);
282 add_exclude_file(p, 1, 0);
291 * XXX: The 'use chroot' flag is a fairly reliable
292 * source of confusion, because it fails under two
293 * important circumstances: running as non-root,
294 * running on Win32 (or possibly others). On the
295 * other hand, if you are running as root, then it
296 * might be better to always use chroot.
298 * So, perhaps if we can't chroot we should just issue
299 * a warning, unless a "require chroot" flag is set,
300 * in which case we fail.
302 if (chroot(lp_path(i))) {
303 rsyserr(FERROR, errno, "chroot %s failed", lp_path(i));
304 io_printf(fd,"@ERROR: chroot failed\n");
308 if (!push_dir("/", 0)) {
309 rsyserr(FERROR, errno, "chdir %s failed\n", lp_path(i));
310 io_printf(fd,"@ERROR: chdir failed\n");
315 if (!push_dir(lp_path(i), 0)) {
316 rsyserr(FERROR, errno, "chdir %s failed\n", lp_path(i));
317 io_printf(fd,"@ERROR: chdir failed\n");
324 #ifdef HAVE_SETGROUPS
325 /* Get rid of any supplementary groups this process
326 * might have inheristed. */
327 if (setgroups(0, NULL)) {
328 rsyserr(FERROR, errno, "setgroups failed");
329 io_printf(fd, "@ERROR: setgroups failed\n");
334 /* XXXX: You could argue that if the daemon is started
335 * by a non-root user and they explicitly specify a
336 * gid, then we should try to change to that gid --
337 * this could be possible if it's already in their
338 * supplementary groups. */
340 /* TODO: Perhaps we need to document that if rsyncd is
341 * started by somebody other than root it will inherit
342 * all their supplementary groups. */
345 rsyserr(FERROR, errno, "setgid %d failed", (int) gid);
346 io_printf(fd,"@ERROR: setgid failed\n");
351 rsyserr(FERROR, errno, "setuid %d failed", (int) uid);
352 io_printf(fd,"@ERROR: setuid failed\n");
356 am_root = (getuid() == 0);
359 io_printf(fd,"@RSYNCD: OK\n");
361 argv[argc++] = "rsyncd";
364 if (!read_line(fd, line, sizeof(line)-1)) {
372 argv[argc] = strdup(p);
378 if (start_glob == 1) {
382 glob_expand(name, argv, &argc, MAX_ARGS);
387 if (strcmp(line,".") == 0) {
391 if (argc == MAX_ARGS) {
396 if (sanitize_paths) {
398 * Note that this is applied to all parameters, whether or not
399 * they are filenames, but no other legal parameters contain
400 * the forms that need to be sanitized so it doesn't hurt;
401 * it is not known at this point which parameters are files
404 for (i = 1; i < argc; i++) {
405 sanitize_path(argv[i], NULL);
410 ret = parse_arguments(&argc, (const char ***) &argp, 0);
414 rprintf(FINFO,"rsync %s %s from %s@%s (%s)\n",
416 request, auth_user, host, addr);
418 rprintf(FINFO,"rsync %s %s from %s (%s)\n",
420 request, host, addr);
426 /* don't allow the logs to be flooded too fast */
427 if (verbose > 1) verbose = 1;
430 if (remote_version < 23) {
431 if (remote_version == 22 || (remote_version > 17 && am_sender))
432 io_start_multiplex_out(fd);
435 /* For later protocol versions, we don't start multiplexing
436 * until we've configured nonblocking in start_server. That
437 * means we're in a sticky situation now: there's no way to
438 * convey errors to the client. */
440 /* FIXME: Hold off on reporting option processing errors until
441 * we've set up nonblocking and multiplexed IO and can get the
442 * message back to them. */
445 exit_cleanup(RERR_UNSUPPORTED);
449 extern int io_timeout;
450 io_timeout = lp_timeout(i);
453 start_server(fd, fd, argc, argp);
458 /* send a list of available modules to the client. Don't list those
459 with "list = False". */
460 static void send_listing(int fd)
462 int n = lp_numservices();
464 extern int remote_version;
468 io_printf(fd, "%-15s\t%s\n", lp_name(i), lp_comment(i));
470 if (remote_version >= 25)
471 io_printf(fd,"@RSYNCD: EXIT\n");
474 /* this is called when a socket connection is established to a client
475 and we want to start talking. The setup of the system is done from
477 static int start_daemon(int fd)
482 extern char *config_file;
483 extern int remote_version;
485 if (!lp_load(config_file, 0)) {
486 exit_cleanup(RERR_SYNTAX);
489 set_socket_options(fd,"SO_KEEPALIVE");
490 set_socket_options(fd,lp_socket_options());
493 io_printf(fd,"@RSYNCD: %d\n", PROTOCOL_VERSION);
495 motd = lp_motd_file();
497 FILE *f = fopen(motd,"r");
498 while (f && !feof(f)) {
499 int len = fread(line, 1, sizeof(line)-1, f);
502 io_printf(fd,"%s", line);
509 if (!read_line(fd, line, sizeof(line)-1)) {
513 if (sscanf(line,"@RSYNCD: %d", &remote_version) != 1) {
514 io_printf(fd,"@ERROR: protocol startup error\n");
520 if (!read_line(fd, line, sizeof(line)-1)) {
524 if (!*line || strcmp(line,"#list")==0) {
530 /* it's some sort of command that I don't understand */
531 io_printf(fd,"@ERROR: Unknown command '%s'\n", line);
537 io_printf(fd,"@ERROR: Unknown module '%s'\n", line);
542 return rsync_module(fd, i);
546 int daemon_main(void)
548 extern char *config_file;
549 extern int orig_umask;
551 extern int no_detach;
553 if (is_a_socket(STDIN_FILENO)) {
556 /* we are running via inetd - close off stdout and
557 stderr so that library functions (and getopt) don't
558 try to use them. Redirect them to /dev/null */
561 open("/dev/null", O_RDWR);
564 return start_daemon(STDIN_FILENO);
570 if (!lp_load(config_file, 1)) {
571 exit_cleanup(RERR_SYNTAX);
576 rprintf(FINFO, "rsyncd version %s starting, listening on port %d\n",
579 /* TODO: If listening on a particular address, then show that
580 * address too. In fact, why not just do inet_ntop on the
581 * local address??? */
583 if (((pid_file = lp_pid_file()) != NULL) && (*pid_file != '\0')) {
586 int pid = (int) getpid();
587 cleanup_set_pid(pid);
588 if ((fd = do_open(lp_pid_file(), O_WRONLY|O_CREAT|O_TRUNC,
589 0666 & ~orig_umask)) == -1) {
591 rsyserr(FLOG, errno, "failed to create pid file %s", pid_file);
592 exit_cleanup(RERR_FILEIO);
594 snprintf(pidbuf, sizeof(pidbuf), "%d\n", pid);
595 write(fd, pidbuf, strlen(pidbuf));
599 start_accept_loop(rsync_port, start_daemon);