2 * The socket based protocol for setting up a connection with rsyncd.
4 * Copyright (C) 1998-2001 Andrew Tridgell <tridge@samba.org>
5 * Copyright (C) 2001-2002 Martin Pool <mbp@samba.org>
6 * Copyright (C) 2002-2008 Wayne Davison
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 3 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License along
19 * with this program; if not, visit the http://fsf.org website.
28 extern int output_motd;
34 extern int rsync_port;
35 extern int protect_args;
36 extern int ignore_errors;
37 extern int preserve_xattrs;
38 extern int kluge_around_eof;
39 extern int daemon_over_rsh;
40 extern int sanitize_paths;
41 extern int numeric_ids;
42 extern int filesfrom_fd;
43 extern int remote_protocol;
44 extern int protocol_version;
45 extern int io_timeout;
47 extern int write_batch;
48 extern int default_af_hint;
49 extern int logfile_format_has_i;
50 extern int logfile_format_has_o_or_i;
51 extern mode_t orig_umask;
52 extern char *bind_address;
53 extern char *sockopts;
54 extern char *config_file;
55 extern char *logfile_format;
56 extern char *files_from;
58 extern struct chmod_mode_struct *chmod_modes;
59 extern struct filter_list_struct daemon_filter_list;
60 extern char curr_dir[];
62 extern char *iconv_opt;
63 extern iconv_t ic_send, ic_recv;
69 int munge_symlinks = 0;
70 struct chmod_mode_struct *daemon_chmod_modes;
72 /* module_dirlen is the length of the module_dir string when in daemon
73 * mode and module_dir is not "/"; otherwise 0. (Note that a chroot-
74 * enabled module can have a non-"/" module_dir these days.) */
75 char *module_dir = NULL;
76 unsigned int module_dirlen = 0;
78 char *full_module_path;
80 static int rl_nulls = 0;
83 static struct sigaction sigact;
87 * Run a client connected to an rsyncd. The alternative to this
88 * function for remote-shell connections is do_cmd().
90 * After negotiating which module to use and reading the server's
91 * motd, this hands over to client_run(). Telling the server the
92 * module will cause it to chroot/setuid/etc.
94 * Instead of doing a transfer, the client may at this stage instead
95 * get a listing of remote modules and exit.
97 * @return -1 for error in startup, or the result of client_run().
98 * Either way, it eventually gets passed to exit_cleanup().
100 int start_socket_client(char *host, int remote_argc, char *remote_argv[],
101 int argc, char *argv[])
104 char *p, *user = NULL;
106 /* This is redundant with code in start_inband_exchange(), but this
107 * short-circuits a problem in the client before we open a socket,
108 * and the extra check won't hurt. */
109 if (**remote_argv == '/') {
111 "ERROR: The remote path must start with a module name not a /\n");
115 if ((p = strrchr(host, '@')) != NULL) {
121 fd = open_socket_out_wrapped(host, rsync_port, bind_address,
124 exit_cleanup(RERR_SOCKETIO);
130 ret = start_inband_exchange(fd, fd, user, remote_argc, remote_argv);
132 return ret ? ret : client_run(fd, fd, -1, argc, argv);
135 static int exchange_protocols(int f_in, int f_out, char *buf, size_t bufsiz, int am_client)
138 #if SUBPROTOCOL_VERSION != 0
139 int our_sub = protocol_version < PROTOCOL_VERSION ? 0 : SUBPROTOCOL_VERSION;
145 io_printf(f_out, "@RSYNCD: %d.%d\n", protocol_version, our_sub);
148 motd = lp_motd_file();
150 FILE *f = fopen(motd,"r");
151 while (f && !feof(f)) {
152 int len = fread(buf, 1, bufsiz - 1, f);
154 write_buf(f_out, buf, len);
158 write_sbuf(f_out, "\n");
162 /* This strips the \n. */
163 if (!read_line_old(f_in, buf, bufsiz)) {
165 rprintf(FERROR, "rsync: did not see server greeting\n");
169 if (sscanf(buf, "@RSYNCD: %d.%d", &remote_protocol, &remote_sub) < 1) {
171 rprintf(FERROR, "rsync: server sent \"%s\" rather than greeting\n", buf);
173 io_printf(f_out, "@ERROR: protocol startup error\n");
177 if (remote_sub < 0) {
178 if (remote_protocol == 30) {
180 rprintf(FERROR, "rsync: server is speaking an incompatible beta of protocol 30\n");
182 io_printf(f_out, "@ERROR: your client is speaking an incompatible beta of protocol 30\n");
188 if (protocol_version > remote_protocol) {
189 protocol_version = remote_protocol;
192 } else if (protocol_version == remote_protocol) {
193 if (remote_sub != our_sub)
196 #if SUBPROTOCOL_VERSION != 0
197 else if (protocol_version < remote_protocol) {
203 if (protocol_version >= 30)
209 int start_inband_exchange(int f_in, int f_out, const char *user, int argc, char *argv[])
212 char line[BIGPATHBUFLEN];
213 char *sargs[MAX_ARGS];
217 assert(argc > 0 && *argv != NULL);
221 "ERROR: The remote path must start with a module name\n");
225 if (!(p = strchr(*argv, '/')))
226 modlen = strlen(*argv);
230 if (!(modname = new_array(char, modlen+1+1))) /* room for '/' & '\0' */
231 out_of_memory("start_inband_exchange");
232 strlcpy(modname, *argv, modlen + 1);
233 modname[modlen] = '/';
234 modname[modlen+1] = '\0';
237 user = getenv("USER");
239 user = getenv("LOGNAME");
241 if (exchange_protocols(f_in, f_out, line, sizeof line, 1) < 0)
244 /* set daemon_over_rsh to false since we need to build the
245 * true set of args passed through the rsh/ssh connection;
246 * this is a no-op for direct-socket-connection mode */
248 server_options(sargs, &sargc);
250 if (sargc >= MAX_ARGS - 2)
253 sargs[sargc++] = ".";
256 if (sargc >= MAX_ARGS - 1) {
258 rprintf(FERROR, "internal: args[] overflowed in do_cmd()\n");
259 exit_cleanup(RERR_SYNTAX);
261 if (strncmp(*argv, modname, modlen) == 0
262 && argv[0][modlen] == '\0')
263 sargs[sargc++] = modname; /* we send "modname/" */
265 sargs[sargc++] = *argv;
273 print_child_argv("sending daemon args:", sargs);
275 io_printf(f_out, "%.*s\n", modlen, modname);
277 /* Old servers may just drop the connection here,
278 rather than sending a proper EXIT command. Yuck. */
279 kluge_around_eof = list_only && protocol_version < 25 ? 1 : 0;
282 if (!read_line_old(f_in, line, sizeof line)) {
283 rprintf(FERROR, "rsync: didn't get server startup line\n");
287 if (strncmp(line,"@RSYNCD: AUTHREQD ",18) == 0) {
288 auth_client(f_out, user, line+18);
292 if (strcmp(line,"@RSYNCD: OK") == 0)
295 if (strcmp(line,"@RSYNCD: EXIT") == 0) {
296 /* This is sent by recent versions of the
297 * server to terminate the listing of modules.
298 * We don't want to go on and transfer
299 * anything; just exit. */
303 if (strncmp(line, "@ERROR", 6) == 0) {
304 rprintf(FERROR, "%s\n", line);
305 /* This is always fatal; the server will now
306 * close the socket. */
310 /* This might be a MOTD line or a module listing, but there is
311 * no way to differentiate it. The manpage mentions this. */
313 rprintf(FINFO, "%s\n", line);
315 kluge_around_eof = 0;
318 for (i = 0; i < sargc; i++) {
319 if (!sargs[i]) /* stop at --protect-args NULL */
321 write_sbuf(f_out, sargs[i]);
322 write_byte(f_out, 0);
324 write_byte(f_out, 0);
326 for (i = 0; i < sargc; i++)
327 io_printf(f_out, "%s\n", sargs[i]);
328 write_sbuf(f_out, "\n");
332 send_protected_args(f_out, sargs);
334 if (protocol_version < 23) {
335 if (protocol_version == 22 || !am_sender)
336 io_start_multiplex_in();
344 static char *finish_pre_exec(pid_t pid, int fd, char *request,
345 char **early_argv, char **argv)
347 int j = 0, status = -1;
352 write_buf(fd, request, strlen(request)+1);
354 for ( ; *early_argv; early_argv++)
355 write_buf(fd, *early_argv, strlen(*early_argv)+1);
356 j = 1; /* Skip arg0 name in argv. */
358 for ( ; argv[j]; j++) {
359 write_buf(fd, argv[j], strlen(argv[j])+1);
360 if (argv[j][0] == '.' && argv[j][1] == '\0')
367 if (wait_process(pid, &status, 0) < 0
368 || !WIFEXITED(status) || WEXITSTATUS(status) != 0) {
370 if (asprintf(&e, "pre-xfer exec returned failure (%d)%s%s\n",
371 status, status < 0 ? ": " : "",
372 status < 0 ? strerror(errno) : "") < 0)
373 out_of_memory("finish_pre_exec");
379 static int read_arg_from_pipe(int fd, char *buf, int limit)
381 char *bp = buf, *eob = buf + limit - 1;
384 int got = read(fd, bp, 1);
386 if (got < 0 && errno == EINTR)
400 static int path_failure(int f_out, const char *dir, BOOL was_chdir)
403 rsyserr(FLOG, errno, "chdir %s failed\n", dir);
405 rprintf(FLOG, "normalize_path(%s) failed\n", dir);
406 io_printf(f_out, "@ERROR: chdir failed\n");
410 static int rsync_module(int f_in, int f_out, int i, char *addr, char *host)
413 char **argv, **orig_argv, **orig_early_argv, *module_chdir;
414 char line[BIGPATHBUFLEN];
415 uid_t uid = (uid_t)-2; /* canonically "nobody" */
416 gid_t gid = (gid_t)-2;
417 char *p, *err_msg = NULL;
418 char *name = lp_name(i);
419 int use_chroot = lp_use_chroot(i);
420 int ret, pre_exec_fd = -1;
421 pid_t pre_exec_pid = 0;
422 char *request = NULL;
425 iconv_opt = lp_charset(i);
431 if (!allow_access(addr, host, lp_hosts_allow(i), lp_hosts_deny(i))) {
432 rprintf(FLOG, "rsync denied on module %s from %s (%s)\n",
435 io_printf(f_out, "@ERROR: Unknown module '%s'\n", name);
438 "@ERROR: access denied to %s from %s (%s)\n",
444 if (am_daemon && am_server) {
445 rprintf(FLOG, "rsync allowed access on module %s from %s (%s)\n",
449 if (!claim_connection(lp_lock_file(i), lp_max_connections(i))) {
451 rsyserr(FLOG, errno, "failed to open lock file %s",
453 io_printf(f_out, "@ERROR: failed to open lock file\n");
455 rprintf(FLOG, "max connections (%d) reached\n",
456 lp_max_connections(i));
457 io_printf(f_out, "@ERROR: max connections (%d) reached -- try again later\n",
458 lp_max_connections(i));
463 auth_user = auth_server(f_in, f_out, i, host, addr, "@RSYNCD: AUTHREQD ");
466 io_printf(f_out, "@ERROR: auth failed on module %s\n", name);
475 if (lp_transfer_logging(i) && !logfile_format)
476 logfile_format = lp_log_format(i);
477 if (log_format_has(logfile_format, 'i'))
478 logfile_format_has_i = 1;
479 if (logfile_format_has_i || log_format_has(logfile_format, 'o'))
480 logfile_format_has_o_or_i = 1;
482 am_root = (MY_UID() == 0);
486 if (!name_to_uid(p, &uid)) {
488 rprintf(FLOG, "Invalid uid %s\n", p);
489 io_printf(f_out, "@ERROR: invalid uid %s\n", p);
496 if (!name_to_gid(p, &gid)) {
498 rprintf(FLOG, "Invalid gid %s\n", p);
499 io_printf(f_out, "@ERROR: invalid gid %s\n", p);
506 /* TODO: If we're not root, but the configuration requests
507 * that we change to some uid other than the current one, then
510 /* TODO: Perhaps take a list of gids, and make them into the
511 * supplementary groups. */
513 module_dir = lp_path(i);
515 if ((p = strstr(module_dir, "/./")) != NULL) {
516 *p = '\0'; /* Temporary... */
517 if (!(module_chdir = normalize_path(module_dir, True, NULL)))
518 return path_failure(f_out, module_dir, False);
520 if (!(p = normalize_path(p + 2, True, &module_dirlen)))
521 return path_failure(f_out, strstr(module_dir, "/./"), False);
522 if (!(full_module_path = normalize_path(module_dir, False, NULL)))
523 full_module_path = module_dir;
526 if (!(module_chdir = normalize_path(module_dir, False, NULL)))
527 return path_failure(f_out, module_dir, False);
528 full_module_path = module_chdir;
533 if (!(module_chdir = normalize_path(module_dir, False, &module_dirlen)))
534 return path_failure(f_out, module_dir, False);
535 full_module_path = module_dir = module_chdir;
538 if (module_dirlen == 1) {
540 set_filter_dir("/", 1);
542 set_filter_dir(module_dir, module_dirlen);
545 parse_rule(&daemon_filter_list, p, MATCHFLG_WORD_SPLIT,
546 XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3);
548 p = lp_include_from(i);
549 parse_filter_file(&daemon_filter_list, p, MATCHFLG_INCLUDE,
550 XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3 | XFLG_OLD_PREFIXES | XFLG_FATAL_ERRORS);
553 parse_rule(&daemon_filter_list, p,
554 MATCHFLG_INCLUDE | MATCHFLG_WORD_SPLIT,
555 XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3 | XFLG_OLD_PREFIXES);
557 p = lp_exclude_from(i);
558 parse_filter_file(&daemon_filter_list, p, 0,
559 XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3 | XFLG_OLD_PREFIXES | XFLG_FATAL_ERRORS);
562 parse_rule(&daemon_filter_list, p, MATCHFLG_WORD_SPLIT,
563 XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3 | XFLG_OLD_PREFIXES);
568 if (*lp_prexfer_exec(i) || *lp_postxfer_exec(i)) {
569 char *modname, *modpath, *hostaddr, *hostname, *username;
572 if (asprintf(&modname, "RSYNC_MODULE_NAME=%s", name) < 0
573 || asprintf(&modpath, "RSYNC_MODULE_PATH=%s", full_module_path) < 0
574 || asprintf(&hostaddr, "RSYNC_HOST_ADDR=%s", addr) < 0
575 || asprintf(&hostname, "RSYNC_HOST_NAME=%s", host) < 0
576 || asprintf(&username, "RSYNC_USER_NAME=%s", auth_user) < 0)
577 out_of_memory("rsync_module");
584 /* For post-xfer exec, fork a new process to run the rsync
585 * daemon while this process waits for the exit status and
586 * runs the indicated command at that point. */
587 if (*lp_postxfer_exec(i)) {
590 rsyserr(FLOG, errno, "fork failed");
591 io_printf(f_out, "@ERROR: fork failed\n");
595 if (asprintf(&p, "RSYNC_PID=%ld", (long)pid) > 0)
597 if (wait_process(pid, &status, 0) < 0)
599 if (asprintf(&p, "RSYNC_RAW_STATUS=%d", status) > 0)
601 if (WIFEXITED(status))
602 status = WEXITSTATUS(status);
605 if (asprintf(&p, "RSYNC_EXIT_STATUS=%d", status) > 0)
607 if (system(lp_postxfer_exec(i)) < 0)
612 /* For pre-xfer exec, fork a child process to run the indicated
613 * command, though it first waits for the parent process to
614 * send us the user's request via a pipe. */
615 if (*lp_prexfer_exec(i)) {
617 if (asprintf(&p, "RSYNC_PID=%ld", (long)getpid()) > 0)
619 if (pipe(fds) < 0 || (pre_exec_pid = fork()) < 0) {
620 rsyserr(FLOG, errno, "pre-xfer exec preparation failed");
621 io_printf(f_out, "@ERROR: pre-xfer exec preparation failed\n");
624 if (pre_exec_pid == 0) {
625 char buf[BIGPATHBUFLEN];
628 set_blocking(fds[0]);
629 len = read_arg_from_pipe(fds[0], buf, BIGPATHBUFLEN);
632 if (asprintf(&p, "RSYNC_REQUEST=%s", buf) > 0)
635 len = read_arg_from_pipe(fds[0], buf,
642 if (asprintf(&p, "RSYNC_ARG%d=%s", j, buf) > 0)
647 close(STDOUT_FILENO);
648 status = system(lp_prexfer_exec(i));
649 if (!WIFEXITED(status))
651 _exit(WEXITSTATUS(status));
654 set_blocking(fds[1]);
655 pre_exec_fd = fds[1];
663 * XXX: The 'use chroot' flag is a fairly reliable
664 * source of confusion, because it fails under two
665 * important circumstances: running as non-root,
666 * running on Win32 (or possibly others). On the
667 * other hand, if you are running as root, then it
668 * might be better to always use chroot.
670 * So, perhaps if we can't chroot we should just issue
671 * a warning, unless a "require chroot" flag is set,
672 * in which case we fail.
674 if (chroot(module_chdir)) {
675 rsyserr(FLOG, errno, "chroot %s failed", module_chdir);
676 io_printf(f_out, "@ERROR: chroot failed\n");
679 module_chdir = module_dir;
682 if (!change_dir(module_chdir, CD_NORMAL))
683 return path_failure(f_out, module_chdir, True);
684 if (module_dirlen || !use_chroot)
687 if ((munge_symlinks = lp_munge_symlinks(i)) < 0)
688 munge_symlinks = !use_chroot || module_dirlen;
689 if (munge_symlinks) {
691 if (do_stat(SYMLINK_PREFIX, &st) == 0 && S_ISDIR(st.st_mode)) {
692 rprintf(FLOG, "Symlink munging is unsupported when a %s directory exists.\n",
694 io_printf(f_out, "@ERROR: daemon security issue -- contact admin\n", name);
695 exit_cleanup(RERR_UNSUPPORTED);
700 /* XXXX: You could argue that if the daemon is started
701 * by a non-root user and they explicitly specify a
702 * gid, then we should try to change to that gid --
703 * this could be possible if it's already in their
704 * supplementary groups. */
706 /* TODO: Perhaps we need to document that if rsyncd is
707 * started by somebody other than root it will inherit
708 * all their supplementary groups. */
711 rsyserr(FLOG, errno, "setgid %d failed", (int)gid);
712 io_printf(f_out, "@ERROR: setgid failed\n");
715 #ifdef HAVE_SETGROUPS
716 /* Get rid of any supplementary groups this process
717 * might have inheristed. */
718 if (setgroups(1, &gid)) {
719 rsyserr(FLOG, errno, "setgroups failed");
720 io_printf(f_out, "@ERROR: setgroups failed\n");
726 rsyserr(FLOG, errno, "setuid %d failed", (int)uid);
727 io_printf(f_out, "@ERROR: setuid failed\n");
731 am_root = (MY_UID() == 0);
734 if (lp_temp_dir(i) && *lp_temp_dir(i)) {
735 tmpdir = lp_temp_dir(i);
736 if (strlen(tmpdir) >= MAXPATHLEN - 10) {
738 "the 'temp dir' value for %s is WAY too long -- ignoring.\n",
744 io_printf(f_out, "@RSYNCD: OK\n");
746 read_args(f_in, name, line, sizeof line, rl_nulls, &argv, &argc, &request);
749 verbose = 0; /* future verbosity is controlled by client options */
750 ret = parse_arguments(&argc, (const char ***) &argv);
751 if (protect_args && ret) {
752 orig_early_argv = orig_argv;
754 read_args(f_in, name, line, sizeof line, 1, &argv, &argc, &request);
756 ret = parse_arguments(&argc, (const char ***) &argv);
758 orig_early_argv = NULL;
761 err_msg = finish_pre_exec(pre_exec_pid, pre_exec_fd, request,
762 orig_early_argv, orig_argv);
766 free(orig_early_argv);
768 am_server = 1; /* Don't let someone try to be tricky. */
770 if (lp_ignore_errors(module_id))
775 if (lp_fake_super(i)) {
776 if (preserve_xattrs > 1)
779 } else if (am_root < 0) /* Treat --fake-super from client as --super. */
782 if (filesfrom_fd == 0)
787 rprintf(FLOG, "rsync %s %s from %s@%s (%s)\n",
788 am_sender ? "on" : "to",
789 request, auth_user, host, addr);
791 rprintf(FLOG, "rsync %s %s from %s (%s)\n",
792 am_sender ? "on" : "to",
793 request, host, addr);
799 /* don't allow the logs to be flooded too fast */
800 if (verbose > lp_max_verbosity(i))
801 verbose = lp_max_verbosity(i);
804 if (protocol_version < 23
805 && (protocol_version == 22 || am_sender))
806 io_start_multiplex_out();
807 else if (!ret || err_msg) {
808 /* We have to get I/O multiplexing started so that we can
809 * get the error back to the client. This means getting
810 * the protocol setup finished first in later versions. */
811 setup_protocol(f_out, f_in);
813 /* Since we failed in our option parsing, we may not
814 * have finished parsing that the client sent us a
815 * --files-from option, so look for it manually.
816 * Without this, the socket would be in the wrong
817 * state for the upcoming error message. */
820 for (i = 0; i < argc; i++) {
821 if (strncmp(argv[i], "--files-from", 12) == 0) {
828 write_byte(f_out, 0);
830 io_start_multiplex_out();
833 if (!ret || err_msg) {
835 rwrite(FERROR, err_msg, strlen(err_msg), 0);
839 exit_cleanup(RERR_UNSUPPORTED);
844 if (ic_send != (iconv_t)-1) {
845 iconv_close(ic_send);
846 ic_send = (iconv_t)-1;
848 if (ic_recv != (iconv_t)-1) {
849 iconv_close(ic_recv);
850 ic_recv = (iconv_t)-1;
856 && (use_chroot ? lp_numeric_ids(i) != False : lp_numeric_ids(i) == True))
857 numeric_ids = -1; /* Set --numeric-ids w/o breaking protocol. */
859 if (lp_timeout(i) && lp_timeout(i) > io_timeout)
860 set_io_timeout(lp_timeout(i));
862 /* If we have some incoming/outgoing chmod changes, append them to
863 * any user-specified changes (making our changes have priority).
864 * We also get a pointer to just our changes so that a receiver
865 * process can use them separately if --perms wasn't specified. */
867 p = lp_outgoing_chmod(i);
869 p = lp_incoming_chmod(i);
870 if (*p && !(daemon_chmod_modes = parse_chmod(p, &chmod_modes))) {
871 rprintf(FLOG, "Invalid \"%sing chmod\" directive: %s\n",
872 am_sender ? "outgo" : "incom", p);
875 start_server(f_in, f_out, argc, argv);
880 /* send a list of available modules to the client. Don't list those
881 with "list = False". */
882 static void send_listing(int fd)
884 int n = lp_numservices();
887 for (i = 0; i < n; i++) {
889 io_printf(fd, "%-15s\t%s\n", lp_name(i), lp_comment(i));
892 if (protocol_version >= 25)
893 io_printf(fd,"@RSYNCD: EXIT\n");
896 static int load_config(int globals_only)
899 if (am_server && am_root <= 0)
900 config_file = RSYNCD_USERCONF;
902 config_file = RSYNCD_SYSCONF;
904 return lp_load(config_file, globals_only);
907 /* this is called when a connection is established to a client
908 and we want to start talking. The setup of the system is done from
910 int start_daemon(int f_in, int f_out)
916 io_set_sock_fds(f_in, f_out);
918 /* We must load the config file before calling any function that
919 * might cause log-file output to occur. This ensures that the
920 * "log file" param gets honored for the 2 non-forked use-cases
921 * (when rsync is run by init and run by a remote shell). */
923 exit_cleanup(RERR_SYNTAX);
925 addr = client_addr(f_in);
926 host = client_name(f_in);
927 rprintf(FLOG, "connect from %s (%s)\n", host, addr);
930 set_socket_options(f_in, "SO_KEEPALIVE");
931 set_nonblocking(f_in);
934 if (exchange_protocols(f_in, f_out, line, sizeof line, 0) < 0)
938 if (!read_line_old(f_in, line, sizeof line))
941 if (!*line || strcmp(line, "#list") == 0) {
942 rprintf(FLOG, "module-list request from %s (%s)\n",
949 /* it's some sort of command that I don't understand */
950 io_printf(f_out, "@ERROR: Unknown command '%s'\n", line);
954 if ((i = lp_number(line)) < 0) {
955 rprintf(FLOG, "unknown module '%s' tried from %s (%s)\n",
957 io_printf(f_out, "@ERROR: Unknown module '%s'\n", line);
961 #ifdef HAVE_SIGACTION
962 sigact.sa_flags = SA_NOCLDSTOP;
964 SIGACTION(SIGCHLD, remember_children);
966 return rsync_module(f_in, f_out, i, addr, host);
969 static void create_pid_file(void)
971 char *pid_file = lp_pid_file();
973 pid_t pid = getpid();
976 if (!pid_file || !*pid_file)
979 cleanup_set_pid(pid);
980 if ((fd = do_open(pid_file, O_WRONLY|O_CREAT|O_EXCL, 0666 & ~orig_umask)) == -1) {
983 fprintf(stderr, "failed to create pid file %s: %s\n", pid_file, strerror(errno));
984 rsyserr(FLOG, errno, "failed to create pid file %s", pid_file);
985 exit_cleanup(RERR_FILEIO);
987 snprintf(pidbuf, sizeof pidbuf, "%ld\n", (long)pid);
988 len = strlen(pidbuf);
989 if (write(fd, pidbuf, len) != len)
994 /* Become a daemon, discarding the controlling terminal. */
995 static void become_daemon(void)
1002 fprintf(stderr, "failed to fork: %s\n", strerror(errno));
1003 exit_cleanup(RERR_FILEIO);
1010 /* detach from the terminal */
1013 #elif defined TIOCNOTTY
1014 i = open("/dev/tty", O_RDWR);
1016 ioctl(i, (int)TIOCNOTTY, (char *)0);
1020 /* make sure that stdin, stdout an stderr don't stuff things
1021 * up (library functions, for example) */
1022 for (i = 0; i < 3; i++) {
1024 open("/dev/null", O_RDWR);
1028 int daemon_main(void)
1030 if (is_a_socket(STDIN_FILENO)) {
1033 /* we are running via inetd - close off stdout and
1034 * stderr so that library functions (and getopt) don't
1035 * try to use them. Redirect them to /dev/null */
1036 for (i = 1; i < 3; i++) {
1038 open("/dev/null", O_RDWR);
1041 return start_daemon(STDIN_FILENO, STDIN_FILENO);
1044 if (!load_config(1)) {
1045 fprintf(stderr, "Failed to parse config file: %s\n", config_file);
1046 exit_cleanup(RERR_SYNTAX);
1054 if (rsync_port == 0 && (rsync_port = lp_rsync_port()) == 0)
1055 rsync_port = RSYNC_PORT;
1056 if (bind_address == NULL && *lp_bind_address())
1057 bind_address = lp_bind_address();
1061 rprintf(FLOG, "rsyncd version %s starting, listening on port %d\n",
1062 RSYNC_VERSION, rsync_port);
1063 /* TODO: If listening on a particular address, then show that
1064 * address too. In fact, why not just do inet_ntop on the
1065 * local address??? */
1067 start_accept_loop(rsync_port, start_daemon);