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) 2002-2009 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 *config_file;
54 extern char *logfile_format;
55 extern char *files_from;
57 extern struct chmod_mode_struct *chmod_modes;
58 extern struct filter_list_struct daemon_filter_list;
60 extern char *iconv_opt;
61 extern iconv_t ic_send, ic_recv;
67 int munge_symlinks = 0;
68 struct chmod_mode_struct *daemon_chmod_modes;
70 /* module_dirlen is the length of the module_dir string when in daemon
71 * mode and module_dir is not "/"; otherwise 0. (Note that a chroot-
72 * enabled module can have a non-"/" module_dir these days.) */
73 char *module_dir = NULL;
74 unsigned int module_dirlen = 0;
76 char *full_module_path;
78 static int rl_nulls = 0;
81 static struct sigaction sigact;
85 * Run a client connected to an rsyncd. The alternative to this
86 * function for remote-shell connections is do_cmd().
88 * After negotiating which module to use and reading the server's
89 * motd, this hands over to client_run(). Telling the server the
90 * module will cause it to chroot/setuid/etc.
92 * Instead of doing a transfer, the client may at this stage instead
93 * get a listing of remote modules and exit.
95 * @return -1 for error in startup, or the result of client_run().
96 * Either way, it eventually gets passed to exit_cleanup().
98 int start_socket_client(char *host, int remote_argc, char *remote_argv[],
99 int argc, char *argv[])
102 char *p, *user = NULL;
104 /* This is redundant with code in start_inband_exchange(), but this
105 * short-circuits a problem in the client before we open a socket,
106 * and the extra check won't hurt. */
107 if (**remote_argv == '/') {
109 "ERROR: The remote path must start with a module name not a /\n");
113 if ((p = strrchr(host, '@')) != NULL) {
119 fd = open_socket_out_wrapped(host, rsync_port, bind_address,
122 exit_cleanup(RERR_SOCKETIO);
128 ret = start_inband_exchange(fd, fd, user, remote_argc, remote_argv);
130 return ret ? ret : client_run(fd, fd, -1, argc, argv);
133 static int exchange_protocols(int f_in, int f_out, char *buf, size_t bufsiz, int am_client)
136 #if SUBPROTOCOL_VERSION != 0
137 int our_sub = protocol_version < PROTOCOL_VERSION ? 0 : SUBPROTOCOL_VERSION;
143 io_printf(f_out, "@RSYNCD: %d.%d\n", protocol_version, our_sub);
146 motd = lp_motd_file();
148 FILE *f = fopen(motd,"r");
149 while (f && !feof(f)) {
150 int len = fread(buf, 1, bufsiz - 1, f);
152 write_buf(f_out, buf, len);
156 write_sbuf(f_out, "\n");
160 /* This strips the \n. */
161 if (!read_line_old(f_in, buf, bufsiz)) {
163 rprintf(FERROR, "rsync: did not see server greeting\n");
167 if (sscanf(buf, "@RSYNCD: %d.%d", &remote_protocol, &remote_sub) < 1) {
169 rprintf(FERROR, "rsync: server sent \"%s\" rather than greeting\n", buf);
171 io_printf(f_out, "@ERROR: protocol startup error\n");
175 if (remote_sub < 0) {
176 if (remote_protocol == 30) {
178 rprintf(FERROR, "rsync: server is speaking an incompatible beta of protocol 30\n");
180 io_printf(f_out, "@ERROR: your client is speaking an incompatible beta of protocol 30\n");
186 if (protocol_version > remote_protocol) {
187 protocol_version = remote_protocol;
190 } else if (protocol_version == remote_protocol) {
191 if (remote_sub != our_sub)
194 #if SUBPROTOCOL_VERSION != 0
195 else if (protocol_version < remote_protocol) {
201 if (protocol_version >= 30)
207 int start_inband_exchange(int f_in, int f_out, const char *user, int argc, char *argv[])
210 char line[BIGPATHBUFLEN];
211 char *sargs[MAX_ARGS];
215 assert(argc > 0 && *argv != NULL);
219 "ERROR: The remote path must start with a module name\n");
223 if (!(p = strchr(*argv, '/')))
224 modlen = strlen(*argv);
228 if (!(modname = new_array(char, modlen+1+1))) /* room for '/' & '\0' */
229 out_of_memory("start_inband_exchange");
230 strlcpy(modname, *argv, modlen + 1);
231 modname[modlen] = '/';
232 modname[modlen+1] = '\0';
235 user = getenv("USER");
237 user = getenv("LOGNAME");
239 if (exchange_protocols(f_in, f_out, line, sizeof line, 1) < 0)
242 /* set daemon_over_rsh to false since we need to build the
243 * true set of args passed through the rsh/ssh connection;
244 * this is a no-op for direct-socket-connection mode */
246 server_options(sargs, &sargc);
248 if (sargc >= MAX_ARGS - 2)
251 sargs[sargc++] = ".";
254 if (sargc >= MAX_ARGS - 1) {
256 rprintf(FERROR, "internal: args[] overflowed in do_cmd()\n");
257 exit_cleanup(RERR_SYNTAX);
259 if (strncmp(*argv, modname, modlen) == 0
260 && argv[0][modlen] == '\0')
261 sargs[sargc++] = modname; /* we send "modname/" */
262 else if (**argv == '-') {
263 if (asprintf(sargs + sargc++, "./%s", *argv) < 0)
264 out_of_memory("start_inband_exchange");
266 sargs[sargc++] = *argv;
274 print_child_argv("sending daemon args:", sargs);
276 io_printf(f_out, "%.*s\n", modlen, modname);
278 /* Old servers may just drop the connection here,
279 rather than sending a proper EXIT command. Yuck. */
280 kluge_around_eof = list_only && protocol_version < 25 ? 1 : 0;
283 if (!read_line_old(f_in, line, sizeof line)) {
284 rprintf(FERROR, "rsync: didn't get server startup line\n");
288 if (strncmp(line,"@RSYNCD: AUTHREQD ",18) == 0) {
289 auth_client(f_out, user, line+18);
293 if (strcmp(line,"@RSYNCD: OK") == 0)
296 if (strcmp(line,"@RSYNCD: EXIT") == 0) {
297 /* This is sent by recent versions of the
298 * server to terminate the listing of modules.
299 * We don't want to go on and transfer
300 * anything; just exit. */
304 if (strncmp(line, "@ERROR", 6) == 0) {
305 rprintf(FERROR, "%s\n", line);
306 /* This is always fatal; the server will now
307 * close the socket. */
311 /* This might be a MOTD line or a module listing, but there is
312 * no way to differentiate it. The manpage mentions this. */
314 rprintf(FINFO, "%s\n", line);
316 kluge_around_eof = 0;
319 for (i = 0; i < sargc; i++) {
320 if (!sargs[i]) /* stop at --protect-args NULL */
322 write_sbuf(f_out, sargs[i]);
323 write_byte(f_out, 0);
325 write_byte(f_out, 0);
327 for (i = 0; i < sargc; i++)
328 io_printf(f_out, "%s\n", sargs[i]);
329 write_sbuf(f_out, "\n");
333 send_protected_args(f_out, sargs);
335 if (protocol_version < 23) {
336 if (protocol_version == 22 || !am_sender)
337 io_start_multiplex_in();
345 static char *finish_pre_exec(pid_t pid, int fd, char *request,
346 char **early_argv, char **argv)
348 int j = 0, status = -1;
353 write_buf(fd, request, strlen(request)+1);
355 for ( ; *early_argv; early_argv++)
356 write_buf(fd, *early_argv, strlen(*early_argv)+1);
357 j = 1; /* Skip arg0 name in argv. */
359 for ( ; argv[j]; j++) {
360 write_buf(fd, argv[j], strlen(argv[j])+1);
361 if (argv[j][0] == '.' && argv[j][1] == '\0')
368 if (wait_process(pid, &status, 0) < 0
369 || !WIFEXITED(status) || WEXITSTATUS(status) != 0) {
371 if (asprintf(&e, "pre-xfer exec returned failure (%d)%s%s\n",
372 status, status < 0 ? ": " : "",
373 status < 0 ? strerror(errno) : "") < 0)
374 out_of_memory("finish_pre_exec");
380 static int read_arg_from_pipe(int fd, char *buf, int limit)
382 char *bp = buf, *eob = buf + limit - 1;
385 int got = read(fd, bp, 1);
387 if (got < 0 && errno == EINTR)
401 static int path_failure(int f_out, const char *dir, BOOL was_chdir)
404 rsyserr(FLOG, errno, "chdir %s failed\n", dir);
406 rprintf(FLOG, "normalize_path(%s) failed\n", dir);
407 io_printf(f_out, "@ERROR: chdir failed\n");
411 static int rsync_module(int f_in, int f_out, int i, char *addr, char *host)
414 char **argv, **orig_argv, **orig_early_argv, *module_chdir;
415 char line[BIGPATHBUFLEN];
416 uid_t uid = (uid_t)-2; /* canonically "nobody" */
417 gid_t gid = (gid_t)-2;
418 char *p, *err_msg = NULL;
419 char *name = lp_name(i);
420 int use_chroot = lp_use_chroot(i);
421 int ret, pre_exec_fd = -1;
422 pid_t pre_exec_pid = 0;
423 char *request = NULL;
426 iconv_opt = lp_charset(i);
432 if (!allow_access(addr, host, lp_hosts_allow(i), lp_hosts_deny(i))) {
433 rprintf(FLOG, "rsync denied on module %s from %s (%s)\n",
436 io_printf(f_out, "@ERROR: Unknown module '%s'\n", name);
439 "@ERROR: access denied to %s from %s (%s)\n",
445 if (am_daemon && am_server) {
446 rprintf(FLOG, "rsync allowed access on module %s from %s (%s)\n",
450 if (!claim_connection(lp_lock_file(i), lp_max_connections(i))) {
452 rsyserr(FLOG, errno, "failed to open lock file %s",
454 io_printf(f_out, "@ERROR: failed to open lock file\n");
456 rprintf(FLOG, "max connections (%d) reached\n",
457 lp_max_connections(i));
458 io_printf(f_out, "@ERROR: max connections (%d) reached -- try again later\n",
459 lp_max_connections(i));
464 auth_user = auth_server(f_in, f_out, i, host, addr, "@RSYNCD: AUTHREQD ");
467 io_printf(f_out, "@ERROR: auth failed on module %s\n", name);
476 if (lp_transfer_logging(i) && !logfile_format)
477 logfile_format = lp_log_format(i);
478 if (log_format_has(logfile_format, 'i'))
479 logfile_format_has_i = 1;
480 if (logfile_format_has_i || log_format_has(logfile_format, 'o'))
481 logfile_format_has_o_or_i = 1;
483 am_root = (MY_UID() == 0);
487 if (!name_to_uid(p, &uid)) {
489 rprintf(FLOG, "Invalid uid %s\n", p);
490 io_printf(f_out, "@ERROR: invalid uid %s\n", p);
497 if (!name_to_gid(p, &gid)) {
499 rprintf(FLOG, "Invalid gid %s\n", p);
500 io_printf(f_out, "@ERROR: invalid gid %s\n", p);
507 /* TODO: If we're not root, but the configuration requests
508 * that we change to some uid other than the current one, then
511 /* TODO: Perhaps take a list of gids, and make them into the
512 * supplementary groups. */
514 module_dir = lp_path(i);
515 if (*module_dir == '\0') {
516 rprintf(FLOG, "No path specified for module %s\n", name);
517 io_printf(f_out, "@ERROR: no path setting.\n");
521 if ((p = strstr(module_dir, "/./")) != NULL) {
522 *p = '\0'; /* Temporary... */
523 if (!(module_chdir = normalize_path(module_dir, True, NULL)))
524 return path_failure(f_out, module_dir, False);
526 if (!(p = normalize_path(p + 2, True, &module_dirlen)))
527 return path_failure(f_out, strstr(module_dir, "/./"), False);
528 if (!(full_module_path = normalize_path(module_dir, False, NULL)))
529 full_module_path = module_dir;
532 if (!(module_chdir = normalize_path(module_dir, False, NULL)))
533 return path_failure(f_out, module_dir, False);
534 full_module_path = module_chdir;
539 if (!(module_chdir = normalize_path(module_dir, False, &module_dirlen)))
540 return path_failure(f_out, module_dir, False);
541 full_module_path = module_dir = module_chdir;
544 if (module_dirlen == 1) {
546 set_filter_dir("/", 1);
548 set_filter_dir(module_dir, module_dirlen);
551 parse_rule(&daemon_filter_list, p, MATCHFLG_WORD_SPLIT,
552 XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3);
554 p = lp_include_from(i);
555 parse_filter_file(&daemon_filter_list, p, MATCHFLG_INCLUDE,
556 XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3 | XFLG_OLD_PREFIXES | XFLG_FATAL_ERRORS);
559 parse_rule(&daemon_filter_list, p,
560 MATCHFLG_INCLUDE | MATCHFLG_WORD_SPLIT,
561 XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3 | XFLG_OLD_PREFIXES);
563 p = lp_exclude_from(i);
564 parse_filter_file(&daemon_filter_list, p, 0,
565 XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3 | XFLG_OLD_PREFIXES | XFLG_FATAL_ERRORS);
568 parse_rule(&daemon_filter_list, p, MATCHFLG_WORD_SPLIT,
569 XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3 | XFLG_OLD_PREFIXES);
574 if (*lp_prexfer_exec(i) || *lp_postxfer_exec(i)) {
575 char *modname, *modpath, *hostaddr, *hostname, *username;
578 if (asprintf(&modname, "RSYNC_MODULE_NAME=%s", name) < 0
579 || asprintf(&modpath, "RSYNC_MODULE_PATH=%s", full_module_path) < 0
580 || asprintf(&hostaddr, "RSYNC_HOST_ADDR=%s", addr) < 0
581 || asprintf(&hostname, "RSYNC_HOST_NAME=%s", host) < 0
582 || asprintf(&username, "RSYNC_USER_NAME=%s", auth_user) < 0)
583 out_of_memory("rsync_module");
590 /* For post-xfer exec, fork a new process to run the rsync
591 * daemon while this process waits for the exit status and
592 * runs the indicated command at that point. */
593 if (*lp_postxfer_exec(i)) {
596 rsyserr(FLOG, errno, "fork failed");
597 io_printf(f_out, "@ERROR: fork failed\n");
601 if (asprintf(&p, "RSYNC_PID=%ld", (long)pid) > 0)
603 if (wait_process(pid, &status, 0) < 0)
605 if (asprintf(&p, "RSYNC_RAW_STATUS=%d", status) > 0)
607 if (WIFEXITED(status))
608 status = WEXITSTATUS(status);
611 if (asprintf(&p, "RSYNC_EXIT_STATUS=%d", status) > 0)
613 if (system(lp_postxfer_exec(i)) < 0)
618 /* For pre-xfer exec, fork a child process to run the indicated
619 * command, though it first waits for the parent process to
620 * send us the user's request via a pipe. */
621 if (*lp_prexfer_exec(i)) {
623 if (asprintf(&p, "RSYNC_PID=%ld", (long)getpid()) > 0)
625 if (pipe(fds) < 0 || (pre_exec_pid = fork()) < 0) {
626 rsyserr(FLOG, errno, "pre-xfer exec preparation failed");
627 io_printf(f_out, "@ERROR: pre-xfer exec preparation failed\n");
630 if (pre_exec_pid == 0) {
631 char buf[BIGPATHBUFLEN];
634 set_blocking(fds[0]);
635 len = read_arg_from_pipe(fds[0], buf, BIGPATHBUFLEN);
638 if (asprintf(&p, "RSYNC_REQUEST=%s", buf) > 0)
641 len = read_arg_from_pipe(fds[0], buf,
648 if (asprintf(&p, "RSYNC_ARG%d=%s", j, buf) > 0)
653 close(STDOUT_FILENO);
654 status = system(lp_prexfer_exec(i));
655 if (!WIFEXITED(status))
657 _exit(WEXITSTATUS(status));
660 set_blocking(fds[1]);
661 pre_exec_fd = fds[1];
669 * XXX: The 'use chroot' flag is a fairly reliable
670 * source of confusion, because it fails under two
671 * important circumstances: running as non-root,
672 * running on Win32 (or possibly others). On the
673 * other hand, if you are running as root, then it
674 * might be better to always use chroot.
676 * So, perhaps if we can't chroot we should just issue
677 * a warning, unless a "require chroot" flag is set,
678 * in which case we fail.
680 if (chroot(module_chdir)) {
681 rsyserr(FLOG, errno, "chroot %s failed", module_chdir);
682 io_printf(f_out, "@ERROR: chroot failed\n");
685 module_chdir = module_dir;
688 if (!change_dir(module_chdir, CD_NORMAL))
689 return path_failure(f_out, module_chdir, True);
690 if (module_dirlen || !use_chroot)
693 if ((munge_symlinks = lp_munge_symlinks(i)) < 0)
694 munge_symlinks = !use_chroot || module_dirlen;
695 if (munge_symlinks) {
697 if (do_stat(SYMLINK_PREFIX, &st) == 0 && S_ISDIR(st.st_mode)) {
698 rprintf(FLOG, "Symlink munging is unsupported when a %s directory exists.\n",
700 io_printf(f_out, "@ERROR: daemon security issue -- contact admin\n", name);
701 exit_cleanup(RERR_UNSUPPORTED);
706 /* XXXX: You could argue that if the daemon is started
707 * by a non-root user and they explicitly specify a
708 * gid, then we should try to change to that gid --
709 * this could be possible if it's already in their
710 * supplementary groups. */
712 /* TODO: Perhaps we need to document that if rsyncd is
713 * started by somebody other than root it will inherit
714 * all their supplementary groups. */
717 rsyserr(FLOG, errno, "setgid %d failed", (int)gid);
718 io_printf(f_out, "@ERROR: setgid failed\n");
721 #ifdef HAVE_SETGROUPS
722 /* Get rid of any supplementary groups this process
723 * might have inheristed. */
724 if (setgroups(1, &gid)) {
725 rsyserr(FLOG, errno, "setgroups failed");
726 io_printf(f_out, "@ERROR: setgroups failed\n");
736 rsyserr(FLOG, errno, "setuid %d failed", (int)uid);
737 io_printf(f_out, "@ERROR: setuid failed\n");
741 am_root = (MY_UID() == 0);
744 if (lp_temp_dir(i) && *lp_temp_dir(i)) {
745 tmpdir = lp_temp_dir(i);
746 if (strlen(tmpdir) >= MAXPATHLEN - 10) {
748 "the 'temp dir' value for %s is WAY too long -- ignoring.\n",
754 io_printf(f_out, "@RSYNCD: OK\n");
756 read_args(f_in, name, line, sizeof line, rl_nulls, &argv, &argc, &request);
759 verbose = 0; /* future verbosity is controlled by client options */
760 ret = parse_arguments(&argc, (const char ***) &argv);
761 if (protect_args && ret) {
762 orig_early_argv = orig_argv;
764 read_args(f_in, name, line, sizeof line, 1, &argv, &argc, &request);
766 ret = parse_arguments(&argc, (const char ***) &argv);
768 orig_early_argv = NULL;
771 err_msg = finish_pre_exec(pre_exec_pid, pre_exec_fd, request,
772 orig_early_argv, orig_argv);
776 free(orig_early_argv);
778 am_server = 1; /* Don't let someone try to be tricky. */
780 if (lp_ignore_errors(module_id))
785 if (lp_fake_super(i)) {
786 if (preserve_xattrs > 1)
789 } else if (am_root < 0) /* Treat --fake-super from client as --super. */
792 if (filesfrom_fd == 0)
797 rprintf(FLOG, "rsync %s %s from %s@%s (%s)\n",
798 am_sender ? "on" : "to",
799 request, auth_user, host, addr);
801 rprintf(FLOG, "rsync %s %s from %s (%s)\n",
802 am_sender ? "on" : "to",
803 request, host, addr);
809 /* don't allow the logs to be flooded too fast */
810 if (verbose > lp_max_verbosity(i))
811 verbose = lp_max_verbosity(i);
814 if (protocol_version < 23
815 && (protocol_version == 22 || am_sender))
816 io_start_multiplex_out();
817 else if (!ret || err_msg) {
818 /* We have to get I/O multiplexing started so that we can
819 * get the error back to the client. This means getting
820 * the protocol setup finished first in later versions. */
821 setup_protocol(f_out, f_in);
823 /* Since we failed in our option parsing, we may not
824 * have finished parsing that the client sent us a
825 * --files-from option, so look for it manually.
826 * Without this, the socket would be in the wrong
827 * state for the upcoming error message. */
830 for (i = 0; i < argc; i++) {
831 if (strncmp(argv[i], "--files-from", 12) == 0) {
838 write_byte(f_out, 0);
840 io_start_multiplex_out();
843 if (!ret || err_msg) {
845 rwrite(FERROR, err_msg, strlen(err_msg), 0);
849 exit_cleanup(RERR_UNSUPPORTED);
854 if (ic_send != (iconv_t)-1) {
855 iconv_close(ic_send);
856 ic_send = (iconv_t)-1;
858 if (ic_recv != (iconv_t)-1) {
859 iconv_close(ic_recv);
860 ic_recv = (iconv_t)-1;
866 && (use_chroot ? lp_numeric_ids(i) != False : lp_numeric_ids(i) == True))
867 numeric_ids = -1; /* Set --numeric-ids w/o breaking protocol. */
869 if (lp_timeout(i) && (!io_timeout || lp_timeout(i) < io_timeout))
870 set_io_timeout(lp_timeout(i));
872 /* If we have some incoming/outgoing chmod changes, append them to
873 * any user-specified changes (making our changes have priority).
874 * We also get a pointer to just our changes so that a receiver
875 * process can use them separately if --perms wasn't specified. */
877 p = lp_outgoing_chmod(i);
879 p = lp_incoming_chmod(i);
880 if (*p && !(daemon_chmod_modes = parse_chmod(p, &chmod_modes))) {
881 rprintf(FLOG, "Invalid \"%sing chmod\" directive: %s\n",
882 am_sender ? "outgo" : "incom", p);
885 start_server(f_in, f_out, argc, argv);
890 /* send a list of available modules to the client. Don't list those
891 with "list = False". */
892 static void send_listing(int fd)
894 int n = lp_numservices();
897 for (i = 0; i < n; i++) {
899 io_printf(fd, "%-15s\t%s\n", lp_name(i), lp_comment(i));
902 if (protocol_version >= 25)
903 io_printf(fd,"@RSYNCD: EXIT\n");
906 static int load_config(int globals_only)
909 if (am_server && am_root <= 0)
910 config_file = RSYNCD_USERCONF;
912 config_file = RSYNCD_SYSCONF;
914 return lp_load(config_file, globals_only);
917 /* this is called when a connection is established to a client
918 and we want to start talking. The setup of the system is done from
920 int start_daemon(int f_in, int f_out)
926 io_set_sock_fds(f_in, f_out);
928 /* We must load the config file before calling any function that
929 * might cause log-file output to occur. This ensures that the
930 * "log file" param gets honored for the 2 non-forked use-cases
931 * (when rsync is run by init and run by a remote shell). */
933 exit_cleanup(RERR_SYNTAX);
935 addr = client_addr(f_in);
936 host = client_name(f_in);
937 rprintf(FLOG, "connect from %s (%s)\n", host, addr);
940 set_socket_options(f_in, "SO_KEEPALIVE");
941 set_nonblocking(f_in);
944 if (exchange_protocols(f_in, f_out, line, sizeof line, 0) < 0)
948 if (!read_line_old(f_in, line, sizeof line))
951 if (!*line || strcmp(line, "#list") == 0) {
952 rprintf(FLOG, "module-list request from %s (%s)\n",
959 /* it's some sort of command that I don't understand */
960 io_printf(f_out, "@ERROR: Unknown command '%s'\n", line);
964 if ((i = lp_number(line)) < 0) {
965 rprintf(FLOG, "unknown module '%s' tried from %s (%s)\n",
967 io_printf(f_out, "@ERROR: Unknown module '%s'\n", line);
971 #ifdef HAVE_SIGACTION
972 sigact.sa_flags = SA_NOCLDSTOP;
974 SIGACTION(SIGCHLD, remember_children);
976 return rsync_module(f_in, f_out, i, addr, host);
979 static void create_pid_file(void)
981 char *pid_file = lp_pid_file();
983 pid_t pid = getpid();
986 if (!pid_file || !*pid_file)
989 cleanup_set_pid(pid);
990 if ((fd = do_open(pid_file, O_WRONLY|O_CREAT|O_EXCL, 0666 & ~orig_umask)) == -1) {
993 fprintf(stderr, "failed to create pid file %s: %s\n", pid_file, strerror(errno));
994 rsyserr(FLOG, errno, "failed to create pid file %s", pid_file);
995 exit_cleanup(RERR_FILEIO);
997 snprintf(pidbuf, sizeof pidbuf, "%ld\n", (long)pid);
998 len = strlen(pidbuf);
999 if (write(fd, pidbuf, len) != len)
1004 /* Become a daemon, discarding the controlling terminal. */
1005 static void become_daemon(void)
1012 fprintf(stderr, "failed to fork: %s\n", strerror(errno));
1013 exit_cleanup(RERR_FILEIO);
1020 /* detach from the terminal */
1023 #elif defined TIOCNOTTY
1024 i = open("/dev/tty", O_RDWR);
1026 ioctl(i, (int)TIOCNOTTY, (char *)0);
1030 /* make sure that stdin, stdout an stderr don't stuff things
1031 * up (library functions, for example) */
1032 for (i = 0; i < 3; i++) {
1034 open("/dev/null", O_RDWR);
1038 int daemon_main(void)
1040 if (is_a_socket(STDIN_FILENO)) {
1043 /* we are running via inetd - close off stdout and
1044 * stderr so that library functions (and getopt) don't
1045 * try to use them. Redirect them to /dev/null */
1046 for (i = 1; i < 3; i++) {
1048 open("/dev/null", O_RDWR);
1051 return start_daemon(STDIN_FILENO, STDIN_FILENO);
1054 if (!load_config(1)) {
1055 fprintf(stderr, "Failed to parse config file: %s\n", config_file);
1056 exit_cleanup(RERR_SYNTAX);
1064 if (rsync_port == 0 && (rsync_port = lp_rsync_port()) == 0)
1065 rsync_port = RSYNC_PORT;
1066 if (bind_address == NULL && *lp_bind_address())
1067 bind_address = lp_bind_address();
1071 rprintf(FLOG, "rsyncd version %s starting, listening on port %d\n",
1072 RSYNC_VERSION, rsync_port);
1073 /* TODO: If listening on a particular address, then show that
1074 * address too. In fact, why not just do inet_ntop on the
1075 * local address??? */
1077 start_accept_loop(rsync_port, start_daemon);