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) 2002-2007 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.
27 extern int output_motd;
33 extern int rsync_port;
34 extern int ignore_errors;
35 extern int kluge_around_eof;
36 extern int daemon_over_rsh;
37 extern int sanitize_paths;
38 extern int numeric_ids;
39 extern int filesfrom_fd;
40 extern int remote_protocol;
41 extern int protocol_version;
42 extern int io_timeout;
44 extern int write_batch;
45 extern int default_af_hint;
46 extern int logfile_format_has_i;
47 extern int logfile_format_has_o_or_i;
48 extern mode_t orig_umask;
49 extern char *bind_address;
50 extern char *sockopts;
51 extern char *config_file;
52 extern char *logfile_format;
53 extern char *files_from;
55 extern struct chmod_mode_struct *chmod_modes;
56 extern struct filter_list_struct server_filter_list;
57 extern char curr_dir[];
59 extern char *iconv_opt;
60 extern iconv_t ic_send, ic_recv;
66 int munge_symlinks = 0;
67 struct chmod_mode_struct *daemon_chmod_modes;
69 /* module_dirlen is the length of the module_dir string when in daemon
70 * mode, not chrooted, and the path is not "/"; otherwise 0. */
71 char *module_dir = NULL;
72 unsigned int module_dirlen = 0;
74 static int rl_nulls = 0;
77 static struct sigaction sigact;
81 * Run a client connected to an rsyncd. The alternative to this
82 * function for remote-shell connections is do_cmd().
84 * After negotiating which module to use and reading the server's
85 * motd, this hands over to client_run(). Telling the server the
86 * module will cause it to chroot/setuid/etc.
88 * Instead of doing a transfer, the client may at this stage instead
89 * get a listing of remote modules and exit.
91 * @return -1 for error in startup, or the result of client_run().
92 * Either way, it eventually gets passed to exit_cleanup().
94 int start_socket_client(char *host, int remote_argc, char *remote_argv[],
95 int argc, char *argv[])
98 char *p, *user = NULL;
100 /* This is redundant with code in start_inband_exchange(), but this
101 * short-circuits a problem in the client before we open a socket,
102 * and the extra check won't hurt. */
103 if (**remote_argv == '/') {
105 "ERROR: The remote path must start with a module name not a /\n");
109 if ((p = strrchr(host, '@')) != NULL) {
115 fd = open_socket_out_wrapped(host, rsync_port, bind_address,
118 exit_cleanup(RERR_SOCKETIO);
120 set_socket_options(fd, sockopts);
122 ret = start_inband_exchange(fd, fd, user, remote_argc, remote_argv);
124 return ret ? ret : client_run(fd, fd, -1, argc, argv);
127 static int exchange_protocols(int f_in, int f_out, char *buf, size_t bufsiz, int am_client)
130 #if SUBPROTOCOL_VERSION != 0
131 int our_sub = protocol_version < PROTOCOL_VERSION ? 0 : SUBPROTOCOL_VERSION;
137 io_printf(f_out, "@RSYNCD: %d.%d\n", protocol_version, our_sub);
140 motd = lp_motd_file();
142 FILE *f = fopen(motd,"r");
143 while (f && !feof(f)) {
144 int len = fread(buf, 1, bufsiz - 1, f);
146 write_buf(f_out, buf, len);
150 write_sbuf(f_out, "\n");
154 /* This strips the \n. */
155 if (!read_line_old(f_in, buf, bufsiz)) {
157 rprintf(FERROR, "rsync: did not see server greeting\n");
161 if (sscanf(buf, "@RSYNCD: %d.%d", &remote_protocol, &remote_sub) < 1) {
163 rprintf(FERROR, "rsync: server sent \"%s\" rather than greeting\n", buf);
165 io_printf(f_out, "@ERROR: protocol startup error\n");
169 if (remote_sub < 0) {
170 if (remote_protocol == 30) {
172 rprintf(FERROR, "rsync: server is speaking an incompatible beta of protocol 30\n");
174 io_printf(f_out, "@ERROR: your client is speaking an incompatible beta of protocol 30\n");
180 if (protocol_version > remote_protocol) {
181 protocol_version = remote_protocol;
184 } else if (protocol_version == remote_protocol) {
185 if (remote_sub != our_sub)
188 #if SUBPROTOCOL_VERSION != 0
189 else if (protocol_version < remote_protocol) {
195 if (protocol_version >= 30)
201 int start_inband_exchange(int f_in, int f_out, const char *user, int argc, char *argv[])
204 char line[BIGPATHBUFLEN];
205 char *sargs[MAX_ARGS];
213 "ERROR: The remote path must start with a module name\n");
217 if (!(p = strchr(*argv, '/')))
218 modlen = strlen(*argv);
222 if (!(modname = new_array(char, modlen+1+1))) /* room for '/' & '\0' */
223 out_of_memory("start_inband_exchange");
224 strlcpy(modname, *argv, modlen + 1);
225 modname[modlen] = '/';
226 modname[modlen+1] = '\0';
229 user = getenv("USER");
231 user = getenv("LOGNAME");
233 if (exchange_protocols(f_in, f_out, line, sizeof line, 1) < 0)
236 /* set daemon_over_rsh to false since we need to build the
237 * true set of args passed through the rsh/ssh connection;
238 * this is a no-op for direct-socket-connection mode */
240 server_options(sargs, &sargc);
242 if (sargc >= MAX_ARGS - 2)
245 sargs[sargc++] = ".";
248 if (sargc >= MAX_ARGS - 1) {
250 rprintf(FERROR, "internal: args[] overflowed in do_cmd()\n");
251 exit_cleanup(RERR_SYNTAX);
253 if (strncmp(*argv, modname, modlen) == 0
254 && argv[0][modlen] == '\0')
255 sargs[sargc++] = modname; /* we send "modname/" */
257 sargs[sargc++] = *argv;
265 print_child_argv("sending daemon args:", sargs);
267 io_printf(f_out, "%.*s\n", modlen, modname);
269 /* Old servers may just drop the connection here,
270 rather than sending a proper EXIT command. Yuck. */
271 kluge_around_eof = list_only && protocol_version < 25 ? 1 : 0;
274 if (!read_line_old(f_in, line, sizeof line)) {
275 rprintf(FERROR, "rsync: didn't get server startup line\n");
279 if (strncmp(line,"@RSYNCD: AUTHREQD ",18) == 0) {
280 auth_client(f_out, user, line+18);
284 if (strcmp(line,"@RSYNCD: OK") == 0)
287 if (strcmp(line,"@RSYNCD: EXIT") == 0) {
288 /* This is sent by recent versions of the
289 * server to terminate the listing of modules.
290 * We don't want to go on and transfer
291 * anything; just exit. */
295 if (strncmp(line, "@ERROR", 6) == 0) {
296 rprintf(FERROR, "%s\n", line);
297 /* This is always fatal; the server will now
298 * close the socket. */
302 /* This might be a MOTD line or a module listing, but there is
303 * no way to differentiate it. The manpage mentions this. */
305 rprintf(FINFO, "%s\n", line);
307 kluge_around_eof = 0;
310 for (i = 0; i < sargc; i++) {
311 write_sbuf(f_out, sargs[i]);
312 write_byte(f_out, 0);
314 write_byte(f_out, 0);
316 for (i = 0; i < sargc; i++)
317 io_printf(f_out, "%s\n", sargs[i]);
318 write_sbuf(f_out, "\n");
321 if (protocol_version < 23) {
322 if (protocol_version == 22 || !am_sender)
323 io_start_multiplex_in();
331 static char *finish_pre_exec(pid_t pid, int fd, char *request,
332 int argc, char *argv[])
339 write_buf(fd, request, strlen(request)+1);
340 for (j = 0; j < argc; j++)
341 write_buf(fd, argv[j], strlen(argv[j])+1);
346 if (wait_process(pid, &status, 0) < 0
347 || !WIFEXITED(status) || WEXITSTATUS(status) != 0) {
349 if (asprintf(&e, "pre-xfer exec returned failure (%d)%s%s\n",
350 status, status < 0 ? ": " : "",
351 status < 0 ? strerror(errno) : "") < 0)
352 out_of_memory("finish_pre_exec");
358 static int read_arg_from_pipe(int fd, char *buf, int limit)
360 char *bp = buf, *eob = buf + limit - 1;
363 int got = read(fd, bp, 1);
365 if (got < 0 && errno == EINTR)
379 static int rsync_module(int f_in, int f_out, int i, char *addr, char *host)
383 char line[BIGPATHBUFLEN];
384 uid_t uid = (uid_t)-2; /* canonically "nobody" */
385 gid_t gid = (gid_t)-2;
386 char *p, *err_msg = NULL;
387 char *name = lp_name(i);
388 int use_chroot = lp_use_chroot(i);
389 int ret, pre_exec_fd = -1;
390 pid_t pre_exec_pid = 0;
391 char *request = NULL;
394 iconv_opt = lp_charset(i);
400 if (!allow_access(addr, host, lp_hosts_allow(i), lp_hosts_deny(i))) {
401 rprintf(FLOG, "rsync denied on module %s from %s (%s)\n",
404 io_printf(f_out, "@ERROR: Unknown module '%s'\n", name);
407 "@ERROR: access denied to %s from %s (%s)\n",
413 if (am_daemon && am_server) {
414 rprintf(FLOG, "rsync allowed access on module %s from %s (%s)\n",
418 if (!claim_connection(lp_lock_file(i), lp_max_connections(i))) {
420 rsyserr(FLOG, errno, "failed to open lock file %s",
422 io_printf(f_out, "@ERROR: failed to open lock file\n");
424 rprintf(FLOG, "max connections (%d) reached\n",
425 lp_max_connections(i));
426 io_printf(f_out, "@ERROR: max connections (%d) reached -- try again later\n",
427 lp_max_connections(i));
432 auth_user = auth_server(f_in, f_out, i, host, addr, "@RSYNCD: AUTHREQD ");
435 io_printf(f_out, "@ERROR: auth failed on module %s\n", name);
444 if (lp_transfer_logging(i) && !logfile_format)
445 logfile_format = lp_log_format(i);
446 if (log_format_has(logfile_format, 'i'))
447 logfile_format_has_i = 1;
448 if (logfile_format_has_i || log_format_has(logfile_format, 'o'))
449 logfile_format_has_o_or_i = 1;
451 am_root = (MY_UID() == 0);
455 if (!name_to_uid(p, &uid)) {
457 rprintf(FLOG, "Invalid uid %s\n", p);
458 io_printf(f_out, "@ERROR: invalid uid %s\n", p);
465 if (!name_to_gid(p, &gid)) {
467 rprintf(FLOG, "Invalid gid %s\n", p);
468 io_printf(f_out, "@ERROR: invalid gid %s\n", p);
475 /* TODO: If we're not root, but the configuration requests
476 * that we change to some uid other than the current one, then
479 /* TODO: Perhaps take a list of gids, and make them into the
480 * supplementary groups. */
482 /* We do a push_dir() without actually calling chdir() in order
483 * to make sure that the module's path is absolute. After this
484 * check, module_dir will be set to an absolute path. */
485 module_dir = lp_path(i);
486 strlcpy(line, curr_dir, sizeof line);
487 if (!push_dir(module_dir, 1))
489 if (strcmp(curr_dir, module_dir) != 0)
490 module_dir = strdup(curr_dir);
491 push_dir(line, 1); /* Restore curr_dir. */
493 if (use_chroot || (module_dirlen = strlen(module_dir)) == 1) {
495 set_filter_dir("/", 1);
497 set_filter_dir(module_dir, module_dirlen);
500 parse_rule(&server_filter_list, p, MATCHFLG_WORD_SPLIT,
503 p = lp_include_from(i);
504 parse_filter_file(&server_filter_list, p, MATCHFLG_INCLUDE,
505 XFLG_ABS_IF_SLASH | XFLG_OLD_PREFIXES | XFLG_FATAL_ERRORS);
508 parse_rule(&server_filter_list, p,
509 MATCHFLG_INCLUDE | MATCHFLG_WORD_SPLIT,
510 XFLG_ABS_IF_SLASH | XFLG_OLD_PREFIXES);
512 p = lp_exclude_from(i);
513 parse_filter_file(&server_filter_list, p, 0,
514 XFLG_ABS_IF_SLASH | XFLG_OLD_PREFIXES | XFLG_FATAL_ERRORS);
517 parse_rule(&server_filter_list, p, MATCHFLG_WORD_SPLIT,
518 XFLG_ABS_IF_SLASH | XFLG_OLD_PREFIXES);
523 if (*lp_prexfer_exec(i) || *lp_postxfer_exec(i)) {
524 char *modname, *modpath, *hostaddr, *hostname, *username;
526 if (asprintf(&modname, "RSYNC_MODULE_NAME=%s", name) < 0
527 || asprintf(&modpath, "RSYNC_MODULE_PATH=%s", module_dir) < 0
528 || asprintf(&hostaddr, "RSYNC_HOST_ADDR=%s", addr) < 0
529 || asprintf(&hostname, "RSYNC_HOST_NAME=%s", host) < 0
530 || asprintf(&username, "RSYNC_USER_NAME=%s", auth_user) < 0)
531 out_of_memory("rsync_module");
538 /* For post-xfer exec, fork a new process to run the rsync
539 * daemon while this process waits for the exit status and
540 * runs the indicated command at that point. */
541 if (*lp_postxfer_exec(i)) {
544 rsyserr(FLOG, errno, "fork failed");
545 io_printf(f_out, "@ERROR: fork failed\n");
549 if (asprintf(&p, "RSYNC_PID=%ld", (long)pid) > 0)
551 if (wait_process(pid, &status, 0) < 0)
553 if (asprintf(&p, "RSYNC_RAW_STATUS=%d", status) > 0)
555 if (WIFEXITED(status))
556 status = WEXITSTATUS(status);
559 if (asprintf(&p, "RSYNC_EXIT_STATUS=%d", status) > 0)
561 system(lp_postxfer_exec(i));
565 /* For pre-xfer exec, fork a child process to run the indicated
566 * command, though it first waits for the parent process to
567 * send us the user's request via a pipe. */
568 if (*lp_prexfer_exec(i)) {
570 if (asprintf(&p, "RSYNC_PID=%ld", (long)getpid()) > 0)
572 if (pipe(fds) < 0 || (pre_exec_pid = fork()) < 0) {
573 rsyserr(FLOG, errno, "pre-xfer exec preparation failed");
574 io_printf(f_out, "@ERROR: pre-xfer exec preparation failed\n");
577 if (pre_exec_pid == 0) {
578 char buf[BIGPATHBUFLEN];
581 set_blocking(fds[0]);
582 len = read_arg_from_pipe(fds[0], buf, BIGPATHBUFLEN);
585 if (asprintf(&p, "RSYNC_REQUEST=%s", buf) > 0)
588 len = read_arg_from_pipe(fds[0], buf,
595 if (asprintf(&p, "RSYNC_ARG%d=%s", j, buf) > 0)
600 close(STDOUT_FILENO);
601 status = system(lp_prexfer_exec(i));
602 if (!WIFEXITED(status))
604 _exit(WEXITSTATUS(status));
607 set_blocking(fds[1]);
608 pre_exec_fd = fds[1];
616 * XXX: The 'use chroot' flag is a fairly reliable
617 * source of confusion, because it fails under two
618 * important circumstances: running as non-root,
619 * running on Win32 (or possibly others). On the
620 * other hand, if you are running as root, then it
621 * might be better to always use chroot.
623 * So, perhaps if we can't chroot we should just issue
624 * a warning, unless a "require chroot" flag is set,
625 * in which case we fail.
627 if (chroot(module_dir)) {
628 rsyserr(FLOG, errno, "chroot %s failed", module_dir);
629 io_printf(f_out, "@ERROR: chroot failed\n");
632 if (!push_dir("/", 0))
635 if (!push_dir(module_dir, 0)) {
637 rsyserr(FLOG, errno, "chdir %s failed\n", module_dir);
638 io_printf(f_out, "@ERROR: chdir failed\n");
644 if ((munge_symlinks = lp_munge_symlinks(i)) < 0)
645 munge_symlinks = !use_chroot;
646 if (munge_symlinks) {
648 if (stat(SYMLINK_PREFIX, &st) == 0 && S_ISDIR(st.st_mode)) {
649 rprintf(FLOG, "Symlink munging is unsupported when a %s directory exists.\n",
651 io_printf(f_out, "@ERROR: daemon security issue -- contact admin\n", name);
652 exit_cleanup(RERR_UNSUPPORTED);
657 /* XXXX: You could argue that if the daemon is started
658 * by a non-root user and they explicitly specify a
659 * gid, then we should try to change to that gid --
660 * this could be possible if it's already in their
661 * supplementary groups. */
663 /* TODO: Perhaps we need to document that if rsyncd is
664 * started by somebody other than root it will inherit
665 * all their supplementary groups. */
668 rsyserr(FLOG, errno, "setgid %d failed", (int)gid);
669 io_printf(f_out, "@ERROR: setgid failed\n");
672 #ifdef HAVE_SETGROUPS
673 /* Get rid of any supplementary groups this process
674 * might have inheristed. */
675 if (setgroups(1, &gid)) {
676 rsyserr(FLOG, errno, "setgroups failed");
677 io_printf(f_out, "@ERROR: setgroups failed\n");
683 rsyserr(FLOG, errno, "setuid %d failed", (int)uid);
684 io_printf(f_out, "@ERROR: setuid failed\n");
688 am_root = (MY_UID() == 0);
691 if (lp_temp_dir(i) && *lp_temp_dir(i)) {
692 tmpdir = lp_temp_dir(i);
693 if (strlen(tmpdir) >= MAXPATHLEN - 10) {
695 "the 'temp dir' value for %s is WAY too long -- ignoring.\n",
701 io_printf(f_out, "@RSYNCD: OK\n");
703 opt_cnt = read_args(f_in, name, line, sizeof line, rl_nulls, &argv, &argc, &request);
706 err_msg = finish_pre_exec(pre_exec_pid, pre_exec_fd, request,
710 verbose = 0; /* future verbosity is controlled by client options */
711 ret = parse_arguments(&argc, (const char ***) &argv, 0);
712 am_server = 1; /* Don't let someone try to be tricky. */
713 if (lp_ignore_errors(module_id))
718 if (lp_fake_super(i))
720 else if (am_root < 0) /* Treat --fake-super from client as --super. */
723 if (filesfrom_fd == 0)
728 rprintf(FLOG, "rsync %s %s from %s@%s (%s)\n",
729 am_sender ? "on" : "to",
730 request, auth_user, host, addr);
732 rprintf(FLOG, "rsync %s %s from %s (%s)\n",
733 am_sender ? "on" : "to",
734 request, host, addr);
740 /* don't allow the logs to be flooded too fast */
741 if (verbose > lp_max_verbosity(i))
742 verbose = lp_max_verbosity(i);
745 if (protocol_version < 23
746 && (protocol_version == 22 || am_sender))
747 io_start_multiplex_out();
748 else if (!ret || err_msg) {
749 /* We have to get I/O multiplexing started so that we can
750 * get the error back to the client. This means getting
751 * the protocol setup finished first in later versions. */
752 setup_protocol(f_out, f_in);
754 /* Since we failed in our option parsing, we may not
755 * have finished parsing that the client sent us a
756 * --files-from option, so look for it manually.
757 * Without this, the socket would be in the wrong
758 * state for the upcoming error message. */
761 for (i = 0; i < argc; i++) {
762 if (strncmp(argv[i], "--files-from", 12) == 0) {
769 write_byte(f_out, 0);
771 io_start_multiplex_out();
774 if (!ret || err_msg) {
776 rwrite(FERROR, err_msg, strlen(err_msg), 0);
780 exit_cleanup(RERR_UNSUPPORTED);
784 if (ic_send != (iconv_t)-1) {
785 iconv_close(ic_send);
786 ic_send = (iconv_t)-1;
788 if (ic_recv != (iconv_t)-1) {
789 iconv_close(ic_recv);
790 ic_recv = (iconv_t)-1;
795 && (use_chroot ? lp_numeric_ids(i) != False : lp_numeric_ids(i) == True))
796 numeric_ids = -1; /* Set --numeric-ids w/o breaking protocol. */
798 if (lp_timeout(i) && lp_timeout(i) > io_timeout)
799 set_io_timeout(lp_timeout(i));
801 /* If we have some incoming/outgoing chmod changes, append them to
802 * any user-specified changes (making our changes have priority).
803 * We also get a pointer to just our changes so that a receiver
804 * process can use them separately if --perms wasn't specified. */
806 p = lp_outgoing_chmod(i);
808 p = lp_incoming_chmod(i);
809 if (*p && !(daemon_chmod_modes = parse_chmod(p, &chmod_modes))) {
810 rprintf(FLOG, "Invalid \"%sing chmod\" directive: %s\n",
811 am_sender ? "outgo" : "incom", p);
814 start_server(f_in, f_out, argc, argv);
819 /* send a list of available modules to the client. Don't list those
820 with "list = False". */
821 static void send_listing(int fd)
823 int n = lp_numservices();
826 for (i = 0; i < n; i++) {
828 io_printf(fd, "%-15s\t%s\n", lp_name(i), lp_comment(i));
831 if (protocol_version >= 25)
832 io_printf(fd,"@RSYNCD: EXIT\n");
835 /* this is called when a connection is established to a client
836 and we want to start talking. The setup of the system is done from
838 int start_daemon(int f_in, int f_out)
844 io_set_sock_fds(f_in, f_out);
846 /* We must load the config file before calling any function that
847 * might cause log-file output to occur. This ensures that the
848 * "log file" param gets honored for the 2 non-forked use-cases
849 * (when rsync is run by init and run by a remote shell). */
850 if (!lp_load(config_file, 0))
851 exit_cleanup(RERR_SYNTAX);
853 addr = client_addr(f_in);
854 host = client_name(f_in);
855 rprintf(FLOG, "connect from %s (%s)\n", host, addr);
858 set_socket_options(f_in, "SO_KEEPALIVE");
860 set_socket_options(f_in, sockopts);
862 set_socket_options(f_in, lp_socket_options());
863 set_nonblocking(f_in);
866 if (exchange_protocols(f_in, f_out, line, sizeof line, 0) < 0)
870 if (!read_line_old(f_in, line, sizeof line))
873 if (!*line || strcmp(line, "#list") == 0) {
874 rprintf(FLOG, "module-list request from %s (%s)\n",
881 /* it's some sort of command that I don't understand */
882 io_printf(f_out, "@ERROR: Unknown command '%s'\n", line);
886 if ((i = lp_number(line)) < 0) {
887 rprintf(FLOG, "unknown module '%s' tried from %s (%s)\n",
889 io_printf(f_out, "@ERROR: Unknown module '%s'\n", line);
893 #ifdef HAVE_SIGACTION
894 sigact.sa_flags = SA_NOCLDSTOP;
896 SIGACTION(SIGCHLD, remember_children);
898 return rsync_module(f_in, f_out, i, addr, host);
901 static void create_pid_file(void)
903 char *pid_file = lp_pid_file();
905 pid_t pid = getpid();
908 if (!pid_file || !*pid_file)
911 cleanup_set_pid(pid);
912 if ((fd = do_open(pid_file, O_WRONLY|O_CREAT|O_EXCL, 0666 & ~orig_umask)) == -1) {
914 fprintf(stderr, "failed to create pid file %s: %s\n", pid_file, strerror(errno));
915 rsyserr(FLOG, errno, "failed to create pid file %s", pid_file);
916 exit_cleanup(RERR_FILEIO);
918 snprintf(pidbuf, sizeof pidbuf, "%ld\n", (long)pid);
919 write(fd, pidbuf, strlen(pidbuf));
923 /* Become a daemon, discarding the controlling terminal. */
924 static void become_daemon(void)
931 fprintf(stderr, "failed to fork: %s\n", strerror(errno));
932 exit_cleanup(RERR_FILEIO);
939 /* detach from the terminal */
942 #elif defined TIOCNOTTY
943 i = open("/dev/tty", O_RDWR);
945 ioctl(i, (int)TIOCNOTTY, (char *)0);
949 /* make sure that stdin, stdout an stderr don't stuff things
950 * up (library functions, for example) */
951 for (i = 0; i < 3; i++) {
953 open("/dev/null", O_RDWR);
957 int daemon_main(void)
960 if (am_server && am_root <= 0)
961 config_file = RSYNCD_USERCONF;
963 config_file = RSYNCD_SYSCONF;
966 if (is_a_socket(STDIN_FILENO)) {
969 /* we are running via inetd - close off stdout and
970 * stderr so that library functions (and getopt) don't
971 * try to use them. Redirect them to /dev/null */
972 for (i = 1; i < 3; i++) {
974 open("/dev/null", O_RDWR);
977 return start_daemon(STDIN_FILENO, STDIN_FILENO);
980 if (!lp_load(config_file, 1)) {
981 fprintf(stderr, "Failed to parse config file: %s\n", config_file);
982 exit_cleanup(RERR_SYNTAX);
990 if (rsync_port == 0 && (rsync_port = lp_rsync_port()) == 0)
991 rsync_port = RSYNC_PORT;
992 if (bind_address == NULL && *lp_bind_address())
993 bind_address = lp_bind_address();
997 rprintf(FLOG, "rsyncd version %s starting, listening on port %d\n",
998 RSYNC_VERSION, rsync_port);
999 /* TODO: If listening on a particular address, then show that
1000 * address too. In fact, why not just do inet_ntop on the
1001 * local address??? */
1003 start_accept_loop(rsync_port, start_daemon);