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.
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 and module_dir is not "/"; otherwise 0. (Note that a chroot-
71 * enabled module can have a non-"/" module_dir these days.) */
72 char *module_dir = NULL;
73 unsigned int module_dirlen = 0;
75 static int rl_nulls = 0;
78 static struct sigaction sigact;
82 * Run a client connected to an rsyncd. The alternative to this
83 * function for remote-shell connections is do_cmd().
85 * After negotiating which module to use and reading the server's
86 * motd, this hands over to client_run(). Telling the server the
87 * module will cause it to chroot/setuid/etc.
89 * Instead of doing a transfer, the client may at this stage instead
90 * get a listing of remote modules and exit.
92 * @return -1 for error in startup, or the result of client_run().
93 * Either way, it eventually gets passed to exit_cleanup().
95 int start_socket_client(char *host, int remote_argc, char *remote_argv[],
96 int argc, char *argv[])
99 char *p, *user = NULL;
101 /* This is redundant with code in start_inband_exchange(), but this
102 * short-circuits a problem in the client before we open a socket,
103 * and the extra check won't hurt. */
104 if (**remote_argv == '/') {
106 "ERROR: The remote path must start with a module name not a /\n");
110 if ((p = strrchr(host, '@')) != NULL) {
116 fd = open_socket_out_wrapped(host, rsync_port, bind_address,
119 exit_cleanup(RERR_SOCKETIO);
121 set_socket_options(fd, sockopts);
127 ret = start_inband_exchange(fd, fd, user, remote_argc, remote_argv);
129 return ret ? ret : client_run(fd, fd, -1, argc, argv);
132 static int exchange_protocols(int f_in, int f_out, char *buf, size_t bufsiz, int am_client)
135 #if SUBPROTOCOL_VERSION != 0
136 int our_sub = protocol_version < PROTOCOL_VERSION ? 0 : SUBPROTOCOL_VERSION;
142 io_printf(f_out, "@RSYNCD: %d.%d\n", protocol_version, our_sub);
145 motd = lp_motd_file();
147 FILE *f = fopen(motd,"r");
148 while (f && !feof(f)) {
149 int len = fread(buf, 1, bufsiz - 1, f);
151 write_buf(f_out, buf, len);
155 write_sbuf(f_out, "\n");
159 /* This strips the \n. */
160 if (!read_line_old(f_in, buf, bufsiz)) {
162 rprintf(FERROR, "rsync: did not see server greeting\n");
166 if (sscanf(buf, "@RSYNCD: %d.%d", &remote_protocol, &remote_sub) < 1) {
168 rprintf(FERROR, "rsync: server sent \"%s\" rather than greeting\n", buf);
170 io_printf(f_out, "@ERROR: protocol startup error\n");
174 if (remote_sub < 0) {
175 if (remote_protocol == 30) {
177 rprintf(FERROR, "rsync: server is speaking an incompatible beta of protocol 30\n");
179 io_printf(f_out, "@ERROR: your client is speaking an incompatible beta of protocol 30\n");
185 if (protocol_version > remote_protocol) {
186 protocol_version = remote_protocol;
189 } else if (protocol_version == remote_protocol) {
190 if (remote_sub != our_sub)
193 #if SUBPROTOCOL_VERSION != 0
194 else if (protocol_version < remote_protocol) {
200 if (protocol_version >= 30)
206 int start_inband_exchange(int f_in, int f_out, const char *user, int argc, char *argv[])
209 char line[BIGPATHBUFLEN];
210 char *sargs[MAX_ARGS];
218 "ERROR: The remote path must start with a module name\n");
222 if (!(p = strchr(*argv, '/')))
223 modlen = strlen(*argv);
227 if (!(modname = new_array(char, modlen+1+1))) /* room for '/' & '\0' */
228 out_of_memory("start_inband_exchange");
229 strlcpy(modname, *argv, modlen + 1);
230 modname[modlen] = '/';
231 modname[modlen+1] = '\0';
234 user = getenv("USER");
236 user = getenv("LOGNAME");
238 if (exchange_protocols(f_in, f_out, line, sizeof line, 1) < 0)
241 /* set daemon_over_rsh to false since we need to build the
242 * true set of args passed through the rsh/ssh connection;
243 * this is a no-op for direct-socket-connection mode */
245 server_options(sargs, &sargc);
247 if (sargc >= MAX_ARGS - 2)
250 sargs[sargc++] = ".";
253 if (sargc >= MAX_ARGS - 1) {
255 rprintf(FERROR, "internal: args[] overflowed in do_cmd()\n");
256 exit_cleanup(RERR_SYNTAX);
258 if (strncmp(*argv, modname, modlen) == 0
259 && argv[0][modlen] == '\0')
260 sargs[sargc++] = modname; /* we send "modname/" */
262 sargs[sargc++] = *argv;
270 print_child_argv("sending daemon args:", sargs);
272 io_printf(f_out, "%.*s\n", modlen, modname);
274 /* Old servers may just drop the connection here,
275 rather than sending a proper EXIT command. Yuck. */
276 kluge_around_eof = list_only && protocol_version < 25 ? 1 : 0;
279 if (!read_line_old(f_in, line, sizeof line)) {
280 rprintf(FERROR, "rsync: didn't get server startup line\n");
284 if (strncmp(line,"@RSYNCD: AUTHREQD ",18) == 0) {
285 auth_client(f_out, user, line+18);
289 if (strcmp(line,"@RSYNCD: OK") == 0)
292 if (strcmp(line,"@RSYNCD: EXIT") == 0) {
293 /* This is sent by recent versions of the
294 * server to terminate the listing of modules.
295 * We don't want to go on and transfer
296 * anything; just exit. */
300 if (strncmp(line, "@ERROR", 6) == 0) {
301 rprintf(FERROR, "%s\n", line);
302 /* This is always fatal; the server will now
303 * close the socket. */
307 /* This might be a MOTD line or a module listing, but there is
308 * no way to differentiate it. The manpage mentions this. */
310 rprintf(FINFO, "%s\n", line);
312 kluge_around_eof = 0;
315 for (i = 0; i < sargc; i++) {
316 write_sbuf(f_out, sargs[i]);
317 write_byte(f_out, 0);
319 write_byte(f_out, 0);
321 for (i = 0; i < sargc; i++)
322 io_printf(f_out, "%s\n", sargs[i]);
323 write_sbuf(f_out, "\n");
326 if (protocol_version < 23) {
327 if (protocol_version == 22 || !am_sender)
328 io_start_multiplex_in();
336 static char *finish_pre_exec(pid_t pid, int fd, char *request,
337 int argc, char *argv[])
344 write_buf(fd, request, strlen(request)+1);
345 for (j = 0; j < argc; j++)
346 write_buf(fd, argv[j], strlen(argv[j])+1);
351 if (wait_process(pid, &status, 0) < 0
352 || !WIFEXITED(status) || WEXITSTATUS(status) != 0) {
354 if (asprintf(&e, "pre-xfer exec returned failure (%d)%s%s\n",
355 status, status < 0 ? ": " : "",
356 status < 0 ? strerror(errno) : "") < 0)
357 out_of_memory("finish_pre_exec");
363 static int read_arg_from_pipe(int fd, char *buf, int limit)
365 char *bp = buf, *eob = buf + limit - 1;
368 int got = read(fd, bp, 1);
370 if (got < 0 && errno == EINTR)
384 static int rsync_module(int f_in, int f_out, int i, char *addr, char *host)
387 char **argv, *chroot_path = NULL;
388 char line[BIGPATHBUFLEN];
389 uid_t uid = (uid_t)-2; /* canonically "nobody" */
390 gid_t gid = (gid_t)-2;
391 char *p, *err_msg = NULL;
392 char *name = lp_name(i);
393 int use_chroot = lp_use_chroot(i);
394 int ret, pre_exec_fd = -1;
395 pid_t pre_exec_pid = 0;
396 char *request = NULL;
399 iconv_opt = lp_charset(i);
405 if (!allow_access(addr, host, lp_hosts_allow(i), lp_hosts_deny(i))) {
406 rprintf(FLOG, "rsync denied on module %s from %s (%s)\n",
409 io_printf(f_out, "@ERROR: Unknown module '%s'\n", name);
412 "@ERROR: access denied to %s from %s (%s)\n",
418 if (am_daemon && am_server) {
419 rprintf(FLOG, "rsync allowed access on module %s from %s (%s)\n",
423 if (!claim_connection(lp_lock_file(i), lp_max_connections(i))) {
425 rsyserr(FLOG, errno, "failed to open lock file %s",
427 io_printf(f_out, "@ERROR: failed to open lock file\n");
429 rprintf(FLOG, "max connections (%d) reached\n",
430 lp_max_connections(i));
431 io_printf(f_out, "@ERROR: max connections (%d) reached -- try again later\n",
432 lp_max_connections(i));
437 auth_user = auth_server(f_in, f_out, i, host, addr, "@RSYNCD: AUTHREQD ");
440 io_printf(f_out, "@ERROR: auth failed on module %s\n", name);
449 if (lp_transfer_logging(i) && !logfile_format)
450 logfile_format = lp_log_format(i);
451 if (log_format_has(logfile_format, 'i'))
452 logfile_format_has_i = 1;
453 if (logfile_format_has_i || log_format_has(logfile_format, 'o'))
454 logfile_format_has_o_or_i = 1;
456 am_root = (MY_UID() == 0);
460 if (!name_to_uid(p, &uid)) {
462 rprintf(FLOG, "Invalid uid %s\n", p);
463 io_printf(f_out, "@ERROR: invalid uid %s\n", p);
470 if (!name_to_gid(p, &gid)) {
472 rprintf(FLOG, "Invalid gid %s\n", p);
473 io_printf(f_out, "@ERROR: invalid gid %s\n", p);
480 /* TODO: If we're not root, but the configuration requests
481 * that we change to some uid other than the current one, then
484 /* TODO: Perhaps take a list of gids, and make them into the
485 * supplementary groups. */
487 module_dir = lp_path(i);
489 if ((p = strstr(module_dir, "/./")) != NULL) {
492 } else if ((p = strdup("/")) == NULL)
493 out_of_memory("rsync_module");
496 /* We do a push_dir() that doesn't actually call chdir()
497 * just to make a relative path absolute. */
498 strlcpy(line, curr_dir, sizeof line);
499 if (!push_dir(module_dir, 1))
501 if (strcmp(curr_dir, module_dir) != 0
502 && (module_dir = strdup(curr_dir)) == NULL)
503 out_of_memory("rsync_module");
504 push_dir(line, 1); /* Restore curr_dir. */
507 chroot_path = module_dir;
508 module_dir = p; /* p is "/" or our inside-chroot path */
510 module_dirlen = clean_fname(module_dir, CFN_COLLAPSE_DOT_DOT_DIRS | CFN_DROP_TRAILING_DOT_DIR);
512 if (module_dirlen == 1) {
514 set_filter_dir("/", 1);
516 set_filter_dir(module_dir, module_dirlen);
519 parse_rule(&server_filter_list, p, MATCHFLG_WORD_SPLIT,
522 p = lp_include_from(i);
523 parse_filter_file(&server_filter_list, p, MATCHFLG_INCLUDE,
524 XFLG_ABS_IF_SLASH | XFLG_OLD_PREFIXES | XFLG_FATAL_ERRORS);
527 parse_rule(&server_filter_list, p,
528 MATCHFLG_INCLUDE | MATCHFLG_WORD_SPLIT,
529 XFLG_ABS_IF_SLASH | XFLG_OLD_PREFIXES);
531 p = lp_exclude_from(i);
532 parse_filter_file(&server_filter_list, p, 0,
533 XFLG_ABS_IF_SLASH | XFLG_OLD_PREFIXES | XFLG_FATAL_ERRORS);
536 parse_rule(&server_filter_list, p, MATCHFLG_WORD_SPLIT,
537 XFLG_ABS_IF_SLASH | XFLG_OLD_PREFIXES);
542 if (*lp_prexfer_exec(i) || *lp_postxfer_exec(i)) {
543 char *modname, *modpath, *hostaddr, *hostname, *username;
548 else if (module_dirlen) {
549 pathjoin(line, sizeof line, chroot_path, module_dir+1);
554 if (asprintf(&modname, "RSYNC_MODULE_NAME=%s", name) < 0
555 || asprintf(&modpath, "RSYNC_MODULE_PATH=%s", p) < 0
556 || asprintf(&hostaddr, "RSYNC_HOST_ADDR=%s", addr) < 0
557 || asprintf(&hostname, "RSYNC_HOST_NAME=%s", host) < 0
558 || asprintf(&username, "RSYNC_USER_NAME=%s", auth_user) < 0)
559 out_of_memory("rsync_module");
566 /* For post-xfer exec, fork a new process to run the rsync
567 * daemon while this process waits for the exit status and
568 * runs the indicated command at that point. */
569 if (*lp_postxfer_exec(i)) {
572 rsyserr(FLOG, errno, "fork failed");
573 io_printf(f_out, "@ERROR: fork failed\n");
577 if (asprintf(&p, "RSYNC_PID=%ld", (long)pid) > 0)
579 if (wait_process(pid, &status, 0) < 0)
581 if (asprintf(&p, "RSYNC_RAW_STATUS=%d", status) > 0)
583 if (WIFEXITED(status))
584 status = WEXITSTATUS(status);
587 if (asprintf(&p, "RSYNC_EXIT_STATUS=%d", status) > 0)
589 system(lp_postxfer_exec(i));
593 /* For pre-xfer exec, fork a child process to run the indicated
594 * command, though it first waits for the parent process to
595 * send us the user's request via a pipe. */
596 if (*lp_prexfer_exec(i)) {
598 if (asprintf(&p, "RSYNC_PID=%ld", (long)getpid()) > 0)
600 if (pipe(fds) < 0 || (pre_exec_pid = fork()) < 0) {
601 rsyserr(FLOG, errno, "pre-xfer exec preparation failed");
602 io_printf(f_out, "@ERROR: pre-xfer exec preparation failed\n");
605 if (pre_exec_pid == 0) {
606 char buf[BIGPATHBUFLEN];
609 set_blocking(fds[0]);
610 len = read_arg_from_pipe(fds[0], buf, BIGPATHBUFLEN);
613 if (asprintf(&p, "RSYNC_REQUEST=%s", buf) > 0)
616 len = read_arg_from_pipe(fds[0], buf,
623 if (asprintf(&p, "RSYNC_ARG%d=%s", j, buf) > 0)
628 close(STDOUT_FILENO);
629 status = system(lp_prexfer_exec(i));
630 if (!WIFEXITED(status))
632 _exit(WEXITSTATUS(status));
635 set_blocking(fds[1]);
636 pre_exec_fd = fds[1];
644 * XXX: The 'use chroot' flag is a fairly reliable
645 * source of confusion, because it fails under two
646 * important circumstances: running as non-root,
647 * running on Win32 (or possibly others). On the
648 * other hand, if you are running as root, then it
649 * might be better to always use chroot.
651 * So, perhaps if we can't chroot we should just issue
652 * a warning, unless a "require chroot" flag is set,
653 * in which case we fail.
655 if (chroot(chroot_path)) {
656 rsyserr(FLOG, errno, "chroot %s failed", chroot_path);
657 io_printf(f_out, "@ERROR: chroot failed\n");
660 if (!push_dir(module_dir, 0))
665 if (!push_dir(module_dir, 0)) {
667 rsyserr(FLOG, errno, "chdir %s failed\n", module_dir);
668 io_printf(f_out, "@ERROR: chdir failed\n");
674 if ((munge_symlinks = lp_munge_symlinks(i)) < 0)
675 munge_symlinks = !use_chroot || module_dirlen;
676 if (munge_symlinks) {
678 if (stat(SYMLINK_PREFIX, &st) == 0 && S_ISDIR(st.st_mode)) {
679 rprintf(FLOG, "Symlink munging is unsupported when a %s directory exists.\n",
681 io_printf(f_out, "@ERROR: daemon security issue -- contact admin\n", name);
682 exit_cleanup(RERR_UNSUPPORTED);
687 /* XXXX: You could argue that if the daemon is started
688 * by a non-root user and they explicitly specify a
689 * gid, then we should try to change to that gid --
690 * this could be possible if it's already in their
691 * supplementary groups. */
693 /* TODO: Perhaps we need to document that if rsyncd is
694 * started by somebody other than root it will inherit
695 * all their supplementary groups. */
698 rsyserr(FLOG, errno, "setgid %d failed", (int)gid);
699 io_printf(f_out, "@ERROR: setgid failed\n");
702 #ifdef HAVE_SETGROUPS
703 /* Get rid of any supplementary groups this process
704 * might have inheristed. */
705 if (setgroups(1, &gid)) {
706 rsyserr(FLOG, errno, "setgroups failed");
707 io_printf(f_out, "@ERROR: setgroups failed\n");
713 rsyserr(FLOG, errno, "setuid %d failed", (int)uid);
714 io_printf(f_out, "@ERROR: setuid failed\n");
718 am_root = (MY_UID() == 0);
721 if (lp_temp_dir(i) && *lp_temp_dir(i)) {
722 tmpdir = lp_temp_dir(i);
723 if (strlen(tmpdir) >= MAXPATHLEN - 10) {
725 "the 'temp dir' value for %s is WAY too long -- ignoring.\n",
731 io_printf(f_out, "@RSYNCD: OK\n");
733 opt_cnt = read_args(f_in, name, line, sizeof line, rl_nulls, &argv, &argc, &request);
736 err_msg = finish_pre_exec(pre_exec_pid, pre_exec_fd, request,
740 verbose = 0; /* future verbosity is controlled by client options */
741 ret = parse_arguments(&argc, (const char ***) &argv, 0);
742 am_server = 1; /* Don't let someone try to be tricky. */
743 if (lp_ignore_errors(module_id))
748 if (lp_fake_super(i))
750 else if (am_root < 0) /* Treat --fake-super from client as --super. */
753 if (filesfrom_fd == 0)
758 rprintf(FLOG, "rsync %s %s from %s@%s (%s)\n",
759 am_sender ? "on" : "to",
760 request, auth_user, host, addr);
762 rprintf(FLOG, "rsync %s %s from %s (%s)\n",
763 am_sender ? "on" : "to",
764 request, host, addr);
770 /* don't allow the logs to be flooded too fast */
771 if (verbose > lp_max_verbosity(i))
772 verbose = lp_max_verbosity(i);
775 if (protocol_version < 23
776 && (protocol_version == 22 || am_sender))
777 io_start_multiplex_out();
778 else if (!ret || err_msg) {
779 /* We have to get I/O multiplexing started so that we can
780 * get the error back to the client. This means getting
781 * the protocol setup finished first in later versions. */
782 setup_protocol(f_out, f_in);
784 /* Since we failed in our option parsing, we may not
785 * have finished parsing that the client sent us a
786 * --files-from option, so look for it manually.
787 * Without this, the socket would be in the wrong
788 * state for the upcoming error message. */
791 for (i = 0; i < argc; i++) {
792 if (strncmp(argv[i], "--files-from", 12) == 0) {
799 write_byte(f_out, 0);
801 io_start_multiplex_out();
804 if (!ret || err_msg) {
806 rwrite(FERROR, err_msg, strlen(err_msg), 0);
810 exit_cleanup(RERR_UNSUPPORTED);
815 if (ic_send != (iconv_t)-1) {
816 iconv_close(ic_send);
817 ic_send = (iconv_t)-1;
819 if (ic_recv != (iconv_t)-1) {
820 iconv_close(ic_recv);
821 ic_recv = (iconv_t)-1;
827 && (use_chroot ? lp_numeric_ids(i) != False : lp_numeric_ids(i) == True))
828 numeric_ids = -1; /* Set --numeric-ids w/o breaking protocol. */
830 if (lp_timeout(i) && lp_timeout(i) > io_timeout)
831 set_io_timeout(lp_timeout(i));
833 /* If we have some incoming/outgoing chmod changes, append them to
834 * any user-specified changes (making our changes have priority).
835 * We also get a pointer to just our changes so that a receiver
836 * process can use them separately if --perms wasn't specified. */
838 p = lp_outgoing_chmod(i);
840 p = lp_incoming_chmod(i);
841 if (*p && !(daemon_chmod_modes = parse_chmod(p, &chmod_modes))) {
842 rprintf(FLOG, "Invalid \"%sing chmod\" directive: %s\n",
843 am_sender ? "outgo" : "incom", p);
846 start_server(f_in, f_out, argc, argv);
851 /* send a list of available modules to the client. Don't list those
852 with "list = False". */
853 static void send_listing(int fd)
855 int n = lp_numservices();
858 for (i = 0; i < n; i++) {
860 io_printf(fd, "%-15s\t%s\n", lp_name(i), lp_comment(i));
863 if (protocol_version >= 25)
864 io_printf(fd,"@RSYNCD: EXIT\n");
867 /* this is called when a connection is established to a client
868 and we want to start talking. The setup of the system is done from
870 int start_daemon(int f_in, int f_out)
876 io_set_sock_fds(f_in, f_out);
878 /* We must load the config file before calling any function that
879 * might cause log-file output to occur. This ensures that the
880 * "log file" param gets honored for the 2 non-forked use-cases
881 * (when rsync is run by init and run by a remote shell). */
882 if (!lp_load(config_file, 0))
883 exit_cleanup(RERR_SYNTAX);
885 addr = client_addr(f_in);
886 host = client_name(f_in);
887 rprintf(FLOG, "connect from %s (%s)\n", host, addr);
890 set_socket_options(f_in, "SO_KEEPALIVE");
892 set_socket_options(f_in, sockopts);
894 set_socket_options(f_in, lp_socket_options());
895 set_nonblocking(f_in);
898 if (exchange_protocols(f_in, f_out, line, sizeof line, 0) < 0)
902 if (!read_line_old(f_in, line, sizeof line))
905 if (!*line || strcmp(line, "#list") == 0) {
906 rprintf(FLOG, "module-list request from %s (%s)\n",
913 /* it's some sort of command that I don't understand */
914 io_printf(f_out, "@ERROR: Unknown command '%s'\n", line);
918 if ((i = lp_number(line)) < 0) {
919 rprintf(FLOG, "unknown module '%s' tried from %s (%s)\n",
921 io_printf(f_out, "@ERROR: Unknown module '%s'\n", line);
925 #ifdef HAVE_SIGACTION
926 sigact.sa_flags = SA_NOCLDSTOP;
928 SIGACTION(SIGCHLD, remember_children);
930 return rsync_module(f_in, f_out, i, addr, host);
933 static void create_pid_file(void)
935 char *pid_file = lp_pid_file();
937 pid_t pid = getpid();
940 if (!pid_file || !*pid_file)
943 cleanup_set_pid(pid);
944 if ((fd = do_open(pid_file, O_WRONLY|O_CREAT|O_EXCL, 0666 & ~orig_umask)) == -1) {
946 fprintf(stderr, "failed to create pid file %s: %s\n", pid_file, strerror(errno));
947 rsyserr(FLOG, errno, "failed to create pid file %s", pid_file);
948 exit_cleanup(RERR_FILEIO);
950 snprintf(pidbuf, sizeof pidbuf, "%ld\n", (long)pid);
951 write(fd, pidbuf, strlen(pidbuf));
955 /* Become a daemon, discarding the controlling terminal. */
956 static void become_daemon(void)
963 fprintf(stderr, "failed to fork: %s\n", strerror(errno));
964 exit_cleanup(RERR_FILEIO);
971 /* detach from the terminal */
974 #elif defined TIOCNOTTY
975 i = open("/dev/tty", O_RDWR);
977 ioctl(i, (int)TIOCNOTTY, (char *)0);
981 /* make sure that stdin, stdout an stderr don't stuff things
982 * up (library functions, for example) */
983 for (i = 0; i < 3; i++) {
985 open("/dev/null", O_RDWR);
989 int daemon_main(void)
992 if (am_server && am_root <= 0)
993 config_file = RSYNCD_USERCONF;
995 config_file = RSYNCD_SYSCONF;
998 if (is_a_socket(STDIN_FILENO)) {
1001 /* we are running via inetd - close off stdout and
1002 * stderr so that library functions (and getopt) don't
1003 * try to use them. Redirect them to /dev/null */
1004 for (i = 1; i < 3; i++) {
1006 open("/dev/null", O_RDWR);
1009 return start_daemon(STDIN_FILENO, STDIN_FILENO);
1012 if (!lp_load(config_file, 1)) {
1013 fprintf(stderr, "Failed to parse config file: %s\n", config_file);
1014 exit_cleanup(RERR_SYNTAX);
1022 if (rsync_port == 0 && (rsync_port = lp_rsync_port()) == 0)
1023 rsync_port = RSYNC_PORT;
1024 if (bind_address == NULL && *lp_bind_address())
1025 bind_address = lp_bind_address();
1029 rprintf(FLOG, "rsyncd version %s starting, listening on port %d\n",
1030 RSYNC_VERSION, rsync_port);
1031 /* TODO: If listening on a particular address, then show that
1032 * address too. In fact, why not just do inet_ntop on the
1033 * local address??? */
1035 start_accept_loop(rsync_port, start_daemon);