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/" */
263 sargs[sargc++] = *argv;
271 print_child_argv("sending daemon args:", sargs);
273 io_printf(f_out, "%.*s\n", modlen, modname);
275 /* Old servers may just drop the connection here,
276 rather than sending a proper EXIT command. Yuck. */
277 kluge_around_eof = list_only && protocol_version < 25 ? 1 : 0;
280 if (!read_line_old(f_in, line, sizeof line)) {
281 rprintf(FERROR, "rsync: didn't get server startup line\n");
285 if (strncmp(line,"@RSYNCD: AUTHREQD ",18) == 0) {
286 auth_client(f_out, user, line+18);
290 if (strcmp(line,"@RSYNCD: OK") == 0)
293 if (strcmp(line,"@RSYNCD: EXIT") == 0) {
294 /* This is sent by recent versions of the
295 * server to terminate the listing of modules.
296 * We don't want to go on and transfer
297 * anything; just exit. */
301 if (strncmp(line, "@ERROR", 6) == 0) {
302 rprintf(FERROR, "%s\n", line);
303 /* This is always fatal; the server will now
304 * close the socket. */
308 /* This might be a MOTD line or a module listing, but there is
309 * no way to differentiate it. The manpage mentions this. */
311 rprintf(FINFO, "%s\n", line);
313 kluge_around_eof = 0;
316 for (i = 0; i < sargc; i++) {
317 if (!sargs[i]) /* stop at --protect-args NULL */
319 write_sbuf(f_out, sargs[i]);
320 write_byte(f_out, 0);
322 write_byte(f_out, 0);
324 for (i = 0; i < sargc; i++)
325 io_printf(f_out, "%s\n", sargs[i]);
326 write_sbuf(f_out, "\n");
330 send_protected_args(f_out, sargs);
332 if (protocol_version < 23) {
333 if (protocol_version == 22 || !am_sender)
334 io_start_multiplex_in();
342 static char *finish_pre_exec(pid_t pid, int fd, char *request,
343 char **early_argv, char **argv)
345 int j = 0, status = -1;
350 write_buf(fd, request, strlen(request)+1);
352 for ( ; *early_argv; early_argv++)
353 write_buf(fd, *early_argv, strlen(*early_argv)+1);
354 j = 1; /* Skip arg0 name in argv. */
356 for ( ; argv[j]; j++) {
357 write_buf(fd, argv[j], strlen(argv[j])+1);
358 if (argv[j][0] == '.' && argv[j][1] == '\0')
365 if (wait_process(pid, &status, 0) < 0
366 || !WIFEXITED(status) || WEXITSTATUS(status) != 0) {
368 if (asprintf(&e, "pre-xfer exec returned failure (%d)%s%s\n",
369 status, status < 0 ? ": " : "",
370 status < 0 ? strerror(errno) : "") < 0)
371 out_of_memory("finish_pre_exec");
377 static int read_arg_from_pipe(int fd, char *buf, int limit)
379 char *bp = buf, *eob = buf + limit - 1;
382 int got = read(fd, bp, 1);
384 if (got < 0 && errno == EINTR)
398 static int path_failure(int f_out, const char *dir, BOOL was_chdir)
401 rsyserr(FLOG, errno, "chdir %s failed\n", dir);
403 rprintf(FLOG, "normalize_path(%s) failed\n", dir);
404 io_printf(f_out, "@ERROR: chdir failed\n");
408 static int rsync_module(int f_in, int f_out, int i, char *addr, char *host)
411 char **argv, **orig_argv, **orig_early_argv, *module_chdir;
412 char line[BIGPATHBUFLEN];
413 uid_t uid = (uid_t)-2; /* canonically "nobody" */
414 gid_t gid = (gid_t)-2;
415 char *p, *err_msg = NULL;
416 char *name = lp_name(i);
417 int use_chroot = lp_use_chroot(i);
418 int ret, pre_exec_fd = -1;
419 pid_t pre_exec_pid = 0;
420 char *request = NULL;
423 iconv_opt = lp_charset(i);
429 if (!allow_access(addr, host, lp_hosts_allow(i), lp_hosts_deny(i))) {
430 rprintf(FLOG, "rsync denied on module %s from %s (%s)\n",
433 io_printf(f_out, "@ERROR: Unknown module '%s'\n", name);
436 "@ERROR: access denied to %s from %s (%s)\n",
442 if (am_daemon && am_server) {
443 rprintf(FLOG, "rsync allowed access on module %s from %s (%s)\n",
447 if (!claim_connection(lp_lock_file(i), lp_max_connections(i))) {
449 rsyserr(FLOG, errno, "failed to open lock file %s",
451 io_printf(f_out, "@ERROR: failed to open lock file\n");
453 rprintf(FLOG, "max connections (%d) reached\n",
454 lp_max_connections(i));
455 io_printf(f_out, "@ERROR: max connections (%d) reached -- try again later\n",
456 lp_max_connections(i));
461 auth_user = auth_server(f_in, f_out, i, host, addr, "@RSYNCD: AUTHREQD ");
464 io_printf(f_out, "@ERROR: auth failed on module %s\n", name);
473 if (lp_transfer_logging(i) && !logfile_format)
474 logfile_format = lp_log_format(i);
475 if (log_format_has(logfile_format, 'i'))
476 logfile_format_has_i = 1;
477 if (logfile_format_has_i || log_format_has(logfile_format, 'o'))
478 logfile_format_has_o_or_i = 1;
480 am_root = (MY_UID() == 0);
484 if (!name_to_uid(p, &uid)) {
486 rprintf(FLOG, "Invalid uid %s\n", p);
487 io_printf(f_out, "@ERROR: invalid uid %s\n", p);
494 if (!name_to_gid(p, &gid)) {
496 rprintf(FLOG, "Invalid gid %s\n", p);
497 io_printf(f_out, "@ERROR: invalid gid %s\n", p);
504 /* TODO: If we're not root, but the configuration requests
505 * that we change to some uid other than the current one, then
508 /* TODO: Perhaps take a list of gids, and make them into the
509 * supplementary groups. */
511 module_dir = lp_path(i);
512 if (*module_dir == '\0') {
513 rprintf(FLOG, "No path specified for module %s\n", name);
514 io_printf(f_out, "@ERROR: no path setting.\n");
518 if ((p = strstr(module_dir, "/./")) != NULL) {
519 *p = '\0'; /* Temporary... */
520 if (!(module_chdir = normalize_path(module_dir, True, NULL)))
521 return path_failure(f_out, module_dir, False);
523 if (!(p = normalize_path(p + 2, True, &module_dirlen)))
524 return path_failure(f_out, strstr(module_dir, "/./"), False);
525 if (!(full_module_path = normalize_path(module_dir, False, NULL)))
526 full_module_path = module_dir;
529 if (!(module_chdir = normalize_path(module_dir, False, NULL)))
530 return path_failure(f_out, module_dir, False);
531 full_module_path = module_chdir;
536 if (!(module_chdir = normalize_path(module_dir, False, &module_dirlen)))
537 return path_failure(f_out, module_dir, False);
538 full_module_path = module_dir = module_chdir;
541 if (module_dirlen == 1) {
543 set_filter_dir("/", 1);
545 set_filter_dir(module_dir, module_dirlen);
548 parse_rule(&daemon_filter_list, p, MATCHFLG_WORD_SPLIT,
549 XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3);
551 p = lp_include_from(i);
552 parse_filter_file(&daemon_filter_list, p, MATCHFLG_INCLUDE,
553 XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3 | XFLG_OLD_PREFIXES | XFLG_FATAL_ERRORS);
556 parse_rule(&daemon_filter_list, p,
557 MATCHFLG_INCLUDE | MATCHFLG_WORD_SPLIT,
558 XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3 | XFLG_OLD_PREFIXES);
560 p = lp_exclude_from(i);
561 parse_filter_file(&daemon_filter_list, p, 0,
562 XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3 | XFLG_OLD_PREFIXES | XFLG_FATAL_ERRORS);
565 parse_rule(&daemon_filter_list, p, MATCHFLG_WORD_SPLIT,
566 XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3 | XFLG_OLD_PREFIXES);
571 if (*lp_prexfer_exec(i) || *lp_postxfer_exec(i)) {
572 char *modname, *modpath, *hostaddr, *hostname, *username;
575 if (asprintf(&modname, "RSYNC_MODULE_NAME=%s", name) < 0
576 || asprintf(&modpath, "RSYNC_MODULE_PATH=%s", full_module_path) < 0
577 || asprintf(&hostaddr, "RSYNC_HOST_ADDR=%s", addr) < 0
578 || asprintf(&hostname, "RSYNC_HOST_NAME=%s", host) < 0
579 || asprintf(&username, "RSYNC_USER_NAME=%s", auth_user) < 0)
580 out_of_memory("rsync_module");
587 /* For post-xfer exec, fork a new process to run the rsync
588 * daemon while this process waits for the exit status and
589 * runs the indicated command at that point. */
590 if (*lp_postxfer_exec(i)) {
593 rsyserr(FLOG, errno, "fork failed");
594 io_printf(f_out, "@ERROR: fork failed\n");
598 if (asprintf(&p, "RSYNC_PID=%ld", (long)pid) > 0)
600 if (wait_process(pid, &status, 0) < 0)
602 if (asprintf(&p, "RSYNC_RAW_STATUS=%d", status) > 0)
604 if (WIFEXITED(status))
605 status = WEXITSTATUS(status);
608 if (asprintf(&p, "RSYNC_EXIT_STATUS=%d", status) > 0)
610 if (system(lp_postxfer_exec(i)) < 0)
615 /* For pre-xfer exec, fork a child process to run the indicated
616 * command, though it first waits for the parent process to
617 * send us the user's request via a pipe. */
618 if (*lp_prexfer_exec(i)) {
620 if (asprintf(&p, "RSYNC_PID=%ld", (long)getpid()) > 0)
622 if (pipe(fds) < 0 || (pre_exec_pid = fork()) < 0) {
623 rsyserr(FLOG, errno, "pre-xfer exec preparation failed");
624 io_printf(f_out, "@ERROR: pre-xfer exec preparation failed\n");
627 if (pre_exec_pid == 0) {
628 char buf[BIGPATHBUFLEN];
631 set_blocking(fds[0]);
632 len = read_arg_from_pipe(fds[0], buf, BIGPATHBUFLEN);
635 if (asprintf(&p, "RSYNC_REQUEST=%s", buf) > 0)
638 len = read_arg_from_pipe(fds[0], buf,
645 if (asprintf(&p, "RSYNC_ARG%d=%s", j, buf) > 0)
650 close(STDOUT_FILENO);
651 status = system(lp_prexfer_exec(i));
652 if (!WIFEXITED(status))
654 _exit(WEXITSTATUS(status));
657 set_blocking(fds[1]);
658 pre_exec_fd = fds[1];
666 * XXX: The 'use chroot' flag is a fairly reliable
667 * source of confusion, because it fails under two
668 * important circumstances: running as non-root,
669 * running on Win32 (or possibly others). On the
670 * other hand, if you are running as root, then it
671 * might be better to always use chroot.
673 * So, perhaps if we can't chroot we should just issue
674 * a warning, unless a "require chroot" flag is set,
675 * in which case we fail.
677 if (chroot(module_chdir)) {
678 rsyserr(FLOG, errno, "chroot %s failed", module_chdir);
679 io_printf(f_out, "@ERROR: chroot failed\n");
682 module_chdir = module_dir;
685 if (!change_dir(module_chdir, CD_NORMAL))
686 return path_failure(f_out, module_chdir, True);
687 if (module_dirlen || !use_chroot)
690 if ((munge_symlinks = lp_munge_symlinks(i)) < 0)
691 munge_symlinks = !use_chroot || module_dirlen;
692 if (munge_symlinks) {
694 if (do_stat(SYMLINK_PREFIX, &st) == 0 && S_ISDIR(st.st_mode)) {
695 rprintf(FLOG, "Symlink munging is unsupported when a %s directory exists.\n",
697 io_printf(f_out, "@ERROR: daemon security issue -- contact admin\n", name);
698 exit_cleanup(RERR_UNSUPPORTED);
703 /* XXXX: You could argue that if the daemon is started
704 * by a non-root user and they explicitly specify a
705 * gid, then we should try to change to that gid --
706 * this could be possible if it's already in their
707 * supplementary groups. */
709 /* TODO: Perhaps we need to document that if rsyncd is
710 * started by somebody other than root it will inherit
711 * all their supplementary groups. */
714 rsyserr(FLOG, errno, "setgid %d failed", (int)gid);
715 io_printf(f_out, "@ERROR: setgid failed\n");
718 #ifdef HAVE_SETGROUPS
719 /* Get rid of any supplementary groups this process
720 * might have inheristed. */
721 if (setgroups(1, &gid)) {
722 rsyserr(FLOG, errno, "setgroups failed");
723 io_printf(f_out, "@ERROR: setgroups failed\n");
733 rsyserr(FLOG, errno, "setuid %d failed", (int)uid);
734 io_printf(f_out, "@ERROR: setuid failed\n");
738 am_root = (MY_UID() == 0);
741 if (lp_temp_dir(i) && *lp_temp_dir(i)) {
742 tmpdir = lp_temp_dir(i);
743 if (strlen(tmpdir) >= MAXPATHLEN - 10) {
745 "the 'temp dir' value for %s is WAY too long -- ignoring.\n",
751 io_printf(f_out, "@RSYNCD: OK\n");
753 read_args(f_in, name, line, sizeof line, rl_nulls, &argv, &argc, &request);
756 verbose = 0; /* future verbosity is controlled by client options */
757 ret = parse_arguments(&argc, (const char ***) &argv);
758 if (protect_args && ret) {
759 orig_early_argv = orig_argv;
761 read_args(f_in, name, line, sizeof line, 1, &argv, &argc, &request);
763 ret = parse_arguments(&argc, (const char ***) &argv);
765 orig_early_argv = NULL;
768 err_msg = finish_pre_exec(pre_exec_pid, pre_exec_fd, request,
769 orig_early_argv, orig_argv);
773 free(orig_early_argv);
775 am_server = 1; /* Don't let someone try to be tricky. */
777 if (lp_ignore_errors(module_id))
782 if (lp_fake_super(i)) {
783 if (preserve_xattrs > 1)
786 } else if (am_root < 0) /* Treat --fake-super from client as --super. */
789 if (filesfrom_fd == 0)
794 rprintf(FLOG, "rsync %s %s from %s@%s (%s)\n",
795 am_sender ? "on" : "to",
796 request, auth_user, host, addr);
798 rprintf(FLOG, "rsync %s %s from %s (%s)\n",
799 am_sender ? "on" : "to",
800 request, host, addr);
806 /* don't allow the logs to be flooded too fast */
807 if (verbose > lp_max_verbosity(i))
808 verbose = lp_max_verbosity(i);
811 if (protocol_version < 23
812 && (protocol_version == 22 || am_sender))
813 io_start_multiplex_out();
814 else if (!ret || err_msg) {
815 /* We have to get I/O multiplexing started so that we can
816 * get the error back to the client. This means getting
817 * the protocol setup finished first in later versions. */
818 setup_protocol(f_out, f_in);
820 /* Since we failed in our option parsing, we may not
821 * have finished parsing that the client sent us a
822 * --files-from option, so look for it manually.
823 * Without this, the socket would be in the wrong
824 * state for the upcoming error message. */
827 for (i = 0; i < argc; i++) {
828 if (strncmp(argv[i], "--files-from", 12) == 0) {
835 write_byte(f_out, 0);
837 io_start_multiplex_out();
840 if (!ret || err_msg) {
842 rwrite(FERROR, err_msg, strlen(err_msg), 0);
846 exit_cleanup(RERR_UNSUPPORTED);
851 if (ic_send != (iconv_t)-1) {
852 iconv_close(ic_send);
853 ic_send = (iconv_t)-1;
855 if (ic_recv != (iconv_t)-1) {
856 iconv_close(ic_recv);
857 ic_recv = (iconv_t)-1;
863 && (use_chroot ? lp_numeric_ids(i) != False : lp_numeric_ids(i) == True))
864 numeric_ids = -1; /* Set --numeric-ids w/o breaking protocol. */
866 if (lp_timeout(i) && (!io_timeout || lp_timeout(i) < io_timeout))
867 set_io_timeout(lp_timeout(i));
869 /* If we have some incoming/outgoing chmod changes, append them to
870 * any user-specified changes (making our changes have priority).
871 * We also get a pointer to just our changes so that a receiver
872 * process can use them separately if --perms wasn't specified. */
874 p = lp_outgoing_chmod(i);
876 p = lp_incoming_chmod(i);
877 if (*p && !(daemon_chmod_modes = parse_chmod(p, &chmod_modes))) {
878 rprintf(FLOG, "Invalid \"%sing chmod\" directive: %s\n",
879 am_sender ? "outgo" : "incom", p);
882 start_server(f_in, f_out, argc, argv);
887 /* send a list of available modules to the client. Don't list those
888 with "list = False". */
889 static void send_listing(int fd)
891 int n = lp_numservices();
894 for (i = 0; i < n; i++) {
896 io_printf(fd, "%-15s\t%s\n", lp_name(i), lp_comment(i));
899 if (protocol_version >= 25)
900 io_printf(fd,"@RSYNCD: EXIT\n");
903 static int load_config(int globals_only)
906 if (am_server && am_root <= 0)
907 config_file = RSYNCD_USERCONF;
909 config_file = RSYNCD_SYSCONF;
911 return lp_load(config_file, globals_only);
914 /* this is called when a connection is established to a client
915 and we want to start talking. The setup of the system is done from
917 int start_daemon(int f_in, int f_out)
923 io_set_sock_fds(f_in, f_out);
925 /* We must load the config file before calling any function that
926 * might cause log-file output to occur. This ensures that the
927 * "log file" param gets honored for the 2 non-forked use-cases
928 * (when rsync is run by init and run by a remote shell). */
930 exit_cleanup(RERR_SYNTAX);
932 addr = client_addr(f_in);
933 host = client_name(f_in);
934 rprintf(FLOG, "connect from %s (%s)\n", host, addr);
937 set_socket_options(f_in, "SO_KEEPALIVE");
938 set_nonblocking(f_in);
941 if (exchange_protocols(f_in, f_out, line, sizeof line, 0) < 0)
945 if (!read_line_old(f_in, line, sizeof line))
948 if (!*line || strcmp(line, "#list") == 0) {
949 rprintf(FLOG, "module-list request from %s (%s)\n",
956 /* it's some sort of command that I don't understand */
957 io_printf(f_out, "@ERROR: Unknown command '%s'\n", line);
961 if ((i = lp_number(line)) < 0) {
962 rprintf(FLOG, "unknown module '%s' tried from %s (%s)\n",
964 io_printf(f_out, "@ERROR: Unknown module '%s'\n", line);
968 #ifdef HAVE_SIGACTION
969 sigact.sa_flags = SA_NOCLDSTOP;
971 SIGACTION(SIGCHLD, remember_children);
973 return rsync_module(f_in, f_out, i, addr, host);
976 static void create_pid_file(void)
978 char *pid_file = lp_pid_file();
980 pid_t pid = getpid();
983 if (!pid_file || !*pid_file)
986 cleanup_set_pid(pid);
987 if ((fd = do_open(pid_file, O_WRONLY|O_CREAT|O_EXCL, 0666 & ~orig_umask)) == -1) {
990 fprintf(stderr, "failed to create pid file %s: %s\n", pid_file, strerror(errno));
991 rsyserr(FLOG, errno, "failed to create pid file %s", pid_file);
992 exit_cleanup(RERR_FILEIO);
994 snprintf(pidbuf, sizeof pidbuf, "%ld\n", (long)pid);
995 len = strlen(pidbuf);
996 if (write(fd, pidbuf, len) != len)
1001 /* Become a daemon, discarding the controlling terminal. */
1002 static void become_daemon(void)
1009 fprintf(stderr, "failed to fork: %s\n", strerror(errno));
1010 exit_cleanup(RERR_FILEIO);
1017 /* detach from the terminal */
1020 #elif defined TIOCNOTTY
1021 i = open("/dev/tty", O_RDWR);
1023 ioctl(i, (int)TIOCNOTTY, (char *)0);
1027 /* make sure that stdin, stdout an stderr don't stuff things
1028 * up (library functions, for example) */
1029 for (i = 0; i < 3; i++) {
1031 open("/dev/null", O_RDWR);
1035 int daemon_main(void)
1037 if (is_a_socket(STDIN_FILENO)) {
1040 /* we are running via inetd - close off stdout and
1041 * stderr so that library functions (and getopt) don't
1042 * try to use them. Redirect them to /dev/null */
1043 for (i = 1; i < 3; i++) {
1045 open("/dev/null", O_RDWR);
1048 return start_daemon(STDIN_FILENO, STDIN_FILENO);
1051 if (!load_config(1)) {
1052 fprintf(stderr, "Failed to parse config file: %s\n", config_file);
1053 exit_cleanup(RERR_SYNTAX);
1061 if (rsync_port == 0 && (rsync_port = lp_rsync_port()) == 0)
1062 rsync_port = RSYNC_PORT;
1063 if (bind_address == NULL && *lp_bind_address())
1064 bind_address = lp_bind_address();
1068 rprintf(FLOG, "rsyncd version %s starting, listening on port %d\n",
1069 RSYNC_VERSION, rsync_port);
1070 /* TODO: If listening on a particular address, then show that
1071 * address too. In fact, why not just do inet_ntop on the
1072 * local address??? */
1074 start_accept_loop(rsync_port, start_daemon);