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 protect_args;
35 extern int ignore_errors;
36 extern int preserve_xattrs;
37 extern int kluge_around_eof;
38 extern int daemon_over_rsh;
39 extern int sanitize_paths;
40 extern int numeric_ids;
41 extern int filesfrom_fd;
42 extern int remote_protocol;
43 extern int protocol_version;
44 extern int io_timeout;
46 extern int write_batch;
47 extern int default_af_hint;
48 extern int logfile_format_has_i;
49 extern int logfile_format_has_o_or_i;
50 extern mode_t orig_umask;
51 extern char *bind_address;
52 extern char *config_file;
53 extern char *logfile_format;
54 extern char *files_from;
56 extern struct chmod_mode_struct *chmod_modes;
57 extern struct filter_list_struct daemon_filter_list;
58 extern char curr_dir[MAXPATHLEN];
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 static int rl_nulls = 0;
79 static struct sigaction sigact;
83 * Run a client connected to an rsyncd. The alternative to this
84 * function for remote-shell connections is do_cmd().
86 * After negotiating which module to use and reading the server's
87 * motd, this hands over to client_run(). Telling the server the
88 * module will cause it to chroot/setuid/etc.
90 * Instead of doing a transfer, the client may at this stage instead
91 * get a listing of remote modules and exit.
93 * @return -1 for error in startup, or the result of client_run().
94 * Either way, it eventually gets passed to exit_cleanup().
96 int start_socket_client(char *host, int remote_argc, char *remote_argv[],
97 int argc, char *argv[])
100 char *p, *user = NULL;
102 /* This is redundant with code in start_inband_exchange(), but this
103 * short-circuits a problem in the client before we open a socket,
104 * and the extra check won't hurt. */
105 if (**remote_argv == '/') {
107 "ERROR: The remote path must start with a module name not a /\n");
111 if ((p = strrchr(host, '@')) != NULL) {
117 fd = open_socket_out_wrapped(host, rsync_port, bind_address,
120 exit_cleanup(RERR_SOCKETIO);
126 ret = start_inband_exchange(fd, fd, user, remote_argc, remote_argv);
128 return ret ? ret : client_run(fd, fd, -1, argc, argv);
131 static int exchange_protocols(int f_in, int f_out, char *buf, size_t bufsiz, int am_client)
134 #if SUBPROTOCOL_VERSION != 0
135 int our_sub = protocol_version < PROTOCOL_VERSION ? 0 : SUBPROTOCOL_VERSION;
141 io_printf(f_out, "@RSYNCD: %d.%d\n", protocol_version, our_sub);
144 motd = lp_motd_file();
146 FILE *f = fopen(motd,"r");
147 while (f && !feof(f)) {
148 int len = fread(buf, 1, bufsiz - 1, f);
150 write_buf(f_out, buf, len);
154 write_sbuf(f_out, "\n");
158 /* This strips the \n. */
159 if (!read_line_old(f_in, buf, bufsiz)) {
161 rprintf(FERROR, "rsync: did not see server greeting\n");
165 if (sscanf(buf, "@RSYNCD: %d.%d", &remote_protocol, &remote_sub) < 1) {
167 rprintf(FERROR, "rsync: server sent \"%s\" rather than greeting\n", buf);
169 io_printf(f_out, "@ERROR: protocol startup error\n");
173 if (remote_sub < 0) {
174 if (remote_protocol == 30) {
176 rprintf(FERROR, "rsync: server is speaking an incompatible beta of protocol 30\n");
178 io_printf(f_out, "@ERROR: your client is speaking an incompatible beta of protocol 30\n");
184 if (protocol_version > remote_protocol) {
185 protocol_version = remote_protocol;
188 } else if (protocol_version == remote_protocol) {
189 if (remote_sub != our_sub)
192 #if SUBPROTOCOL_VERSION != 0
193 else if (protocol_version < remote_protocol) {
199 if (protocol_version >= 30)
205 int start_inband_exchange(int f_in, int f_out, const char *user, int argc, char *argv[])
208 char line[BIGPATHBUFLEN];
209 char *sargs[MAX_ARGS];
213 assert(argc > 0 && *argv != NULL);
217 "ERROR: The remote path must start with a module name\n");
221 if (!(p = strchr(*argv, '/')))
222 modlen = strlen(*argv);
226 if (!(modname = new_array(char, modlen+1+1))) /* room for '/' & '\0' */
227 out_of_memory("start_inband_exchange");
228 strlcpy(modname, *argv, modlen + 1);
229 modname[modlen] = '/';
230 modname[modlen+1] = '\0';
233 user = getenv("USER");
235 user = getenv("LOGNAME");
237 if (exchange_protocols(f_in, f_out, line, sizeof line, 1) < 0)
240 /* set daemon_over_rsh to false since we need to build the
241 * true set of args passed through the rsh/ssh connection;
242 * this is a no-op for direct-socket-connection mode */
244 server_options(sargs, &sargc);
246 if (sargc >= MAX_ARGS - 2)
249 sargs[sargc++] = ".";
252 if (sargc >= MAX_ARGS - 1) {
254 rprintf(FERROR, "internal: args[] overflowed in do_cmd()\n");
255 exit_cleanup(RERR_SYNTAX);
257 if (strncmp(*argv, modname, modlen) == 0
258 && argv[0][modlen] == '\0')
259 sargs[sargc++] = modname; /* we send "modname/" */
261 sargs[sargc++] = *argv;
268 if (DEBUG_GTE(CMD, 1))
269 print_child_argv("sending daemon args:", sargs);
271 io_printf(f_out, "%.*s\n", modlen, modname);
273 /* Old servers may just drop the connection here,
274 rather than sending a proper EXIT command. Yuck. */
275 kluge_around_eof = list_only && protocol_version < 25 ? 1 : 0;
278 if (!read_line_old(f_in, line, sizeof line)) {
279 rprintf(FERROR, "rsync: didn't get server startup line\n");
283 if (strncmp(line,"@RSYNCD: AUTHREQD ",18) == 0) {
284 auth_client(f_out, user, line+18);
288 if (strcmp(line,"@RSYNCD: OK") == 0)
291 if (strcmp(line,"@RSYNCD: EXIT") == 0) {
292 /* This is sent by recent versions of the
293 * server to terminate the listing of modules.
294 * We don't want to go on and transfer
295 * anything; just exit. */
299 if (strncmp(line, "@ERROR", 6) == 0) {
300 rprintf(FERROR, "%s\n", line);
301 /* This is always fatal; the server will now
302 * close the socket. */
306 /* This might be a MOTD line or a module listing, but there is
307 * no way to differentiate it. The manpage mentions this. */
309 rprintf(FINFO, "%s\n", line);
311 kluge_around_eof = 0;
314 for (i = 0; i < sargc; i++) {
315 if (!sargs[i]) /* stop at --protect-args NULL */
317 write_sbuf(f_out, sargs[i]);
318 write_byte(f_out, 0);
320 write_byte(f_out, 0);
322 for (i = 0; i < sargc; i++)
323 io_printf(f_out, "%s\n", sargs[i]);
324 write_sbuf(f_out, "\n");
328 send_protected_args(f_out, sargs);
330 if (protocol_version < 23) {
331 if (protocol_version == 22 || !am_sender)
332 io_start_multiplex_in();
340 static char *finish_pre_exec(pid_t pid, int fd, char *request,
341 char **early_argv, char **argv)
343 int j = 0, status = -1;
348 write_buf(fd, request, strlen(request)+1);
350 for ( ; *early_argv; early_argv++)
351 write_buf(fd, *early_argv, strlen(*early_argv)+1);
352 j = 1; /* Skip arg0 name in argv. */
354 for ( ; argv[j]; j++) {
355 write_buf(fd, argv[j], strlen(argv[j])+1);
356 if (argv[j][0] == '.' && argv[j][1] == '\0')
363 if (wait_process(pid, &status, 0) < 0
364 || !WIFEXITED(status) || WEXITSTATUS(status) != 0) {
366 if (asprintf(&e, "pre-xfer exec returned failure (%d)%s%s\n",
367 status, status < 0 ? ": " : "",
368 status < 0 ? strerror(errno) : "") < 0)
369 out_of_memory("finish_pre_exec");
375 static int read_arg_from_pipe(int fd, char *buf, int limit)
377 char *bp = buf, *eob = buf + limit - 1;
380 int got = read(fd, bp, 1);
382 if (got < 0 && errno == EINTR)
396 static int rsync_module(int f_in, int f_out, int i, char *addr, char *host)
399 char **argv, **orig_argv, **orig_early_argv, *chroot_path = NULL;
400 char line[BIGPATHBUFLEN];
401 uid_t uid = (uid_t)-2; /* canonically "nobody" */
402 gid_t gid = (gid_t)-2;
403 char *p, *err_msg = NULL;
404 char *name = lp_name(i);
405 int use_chroot = lp_use_chroot(i);
406 int ret, pre_exec_fd = -1;
407 pid_t pre_exec_pid = 0;
408 char *request = NULL;
411 iconv_opt = lp_charset(i);
417 if (!allow_access(addr, host, lp_hosts_allow(i), lp_hosts_deny(i))) {
418 rprintf(FLOG, "rsync denied on module %s from %s (%s)\n",
421 io_printf(f_out, "@ERROR: Unknown module '%s'\n", name);
424 "@ERROR: access denied to %s from %s (%s)\n",
430 if (am_daemon && am_server) {
431 rprintf(FLOG, "rsync allowed access on module %s from %s (%s)\n",
435 if (!claim_connection(lp_lock_file(i), lp_max_connections(i))) {
437 rsyserr(FLOG, errno, "failed to open lock file %s",
439 io_printf(f_out, "@ERROR: failed to open lock file\n");
441 rprintf(FLOG, "max connections (%d) reached\n",
442 lp_max_connections(i));
443 io_printf(f_out, "@ERROR: max connections (%d) reached -- try again later\n",
444 lp_max_connections(i));
449 auth_user = auth_server(f_in, f_out, i, host, addr, "@RSYNCD: AUTHREQD ");
452 io_printf(f_out, "@ERROR: auth failed on module %s\n", name);
461 if (lp_transfer_logging(i) && !logfile_format)
462 logfile_format = lp_log_format(i);
463 if (log_format_has(logfile_format, 'i'))
464 logfile_format_has_i = 1;
465 if (logfile_format_has_i || log_format_has(logfile_format, 'o'))
466 logfile_format_has_o_or_i = 1;
468 am_root = (MY_UID() == 0);
472 if (!name_to_uid(p, &uid)) {
474 rprintf(FLOG, "Invalid uid %s\n", p);
475 io_printf(f_out, "@ERROR: invalid uid %s\n", p);
482 if (!name_to_gid(p, &gid)) {
484 rprintf(FLOG, "Invalid gid %s\n", p);
485 io_printf(f_out, "@ERROR: invalid gid %s\n", p);
492 /* TODO: If we're not root, but the configuration requests
493 * that we change to some uid other than the current one, then
496 /* TODO: Perhaps take a list of gids, and make them into the
497 * supplementary groups. */
499 module_dir = lp_path(i);
501 if ((p = strstr(module_dir, "/./")) != NULL) {
504 } else if ((p = strdup("/")) == NULL) /* MEMORY LEAK */
505 out_of_memory("rsync_module");
508 /* We do a change_dir() that doesn't actually call chdir()
509 * just to make a relative path absolute. */
510 strlcpy(line, curr_dir, sizeof line);
511 if (!change_dir(module_dir, CD_SKIP_CHDIR))
513 if (strcmp(curr_dir, module_dir) != 0
514 && (module_dir = strdup(curr_dir)) == NULL)
515 out_of_memory("rsync_module");
516 change_dir(line, CD_SKIP_CHDIR); /* Restore curr_dir. */
519 chroot_path = module_dir;
520 module_dir = p; /* p is "/" or our inside-chroot path */
522 module_dirlen = clean_fname(module_dir, CFN_COLLAPSE_DOT_DOT_DIRS | CFN_DROP_TRAILING_DOT_DIR);
524 if (module_dirlen == 1) {
526 set_filter_dir("/", 1);
528 set_filter_dir(module_dir, module_dirlen);
531 parse_rule(&daemon_filter_list, p, MATCHFLG_WORD_SPLIT,
532 XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3);
534 p = lp_include_from(i);
535 parse_filter_file(&daemon_filter_list, p, MATCHFLG_INCLUDE,
536 XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3 | XFLG_OLD_PREFIXES | XFLG_FATAL_ERRORS);
539 parse_rule(&daemon_filter_list, p,
540 MATCHFLG_INCLUDE | MATCHFLG_WORD_SPLIT,
541 XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3 | XFLG_OLD_PREFIXES);
543 p = lp_exclude_from(i);
544 parse_filter_file(&daemon_filter_list, p, 0,
545 XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3 | XFLG_OLD_PREFIXES | XFLG_FATAL_ERRORS);
548 parse_rule(&daemon_filter_list, p, MATCHFLG_WORD_SPLIT,
549 XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3 | XFLG_OLD_PREFIXES);
554 if (*lp_prexfer_exec(i) || *lp_postxfer_exec(i)) {
555 char *modname, *modpath, *hostaddr, *hostname, *username;
560 else if (module_dirlen) {
561 pathjoin(line, sizeof line, chroot_path, module_dir+1);
566 if (asprintf(&modname, "RSYNC_MODULE_NAME=%s", name) < 0
567 || asprintf(&modpath, "RSYNC_MODULE_PATH=%s", p) < 0
568 || asprintf(&hostaddr, "RSYNC_HOST_ADDR=%s", addr) < 0
569 || asprintf(&hostname, "RSYNC_HOST_NAME=%s", host) < 0
570 || asprintf(&username, "RSYNC_USER_NAME=%s", auth_user) < 0)
571 out_of_memory("rsync_module");
578 /* For post-xfer exec, fork a new process to run the rsync
579 * daemon while this process waits for the exit status and
580 * runs the indicated command at that point. */
581 if (*lp_postxfer_exec(i)) {
584 rsyserr(FLOG, errno, "fork failed");
585 io_printf(f_out, "@ERROR: fork failed\n");
589 if (asprintf(&p, "RSYNC_PID=%ld", (long)pid) > 0)
591 if (wait_process(pid, &status, 0) < 0)
593 if (asprintf(&p, "RSYNC_RAW_STATUS=%d", status) > 0)
595 if (WIFEXITED(status))
596 status = WEXITSTATUS(status);
599 if (asprintf(&p, "RSYNC_EXIT_STATUS=%d", status) > 0)
601 system(lp_postxfer_exec(i));
605 /* For pre-xfer exec, fork a child process to run the indicated
606 * command, though it first waits for the parent process to
607 * send us the user's request via a pipe. */
608 if (*lp_prexfer_exec(i)) {
610 if (asprintf(&p, "RSYNC_PID=%ld", (long)getpid()) > 0)
612 if (pipe(fds) < 0 || (pre_exec_pid = fork()) < 0) {
613 rsyserr(FLOG, errno, "pre-xfer exec preparation failed");
614 io_printf(f_out, "@ERROR: pre-xfer exec preparation failed\n");
617 if (pre_exec_pid == 0) {
618 char buf[BIGPATHBUFLEN];
621 set_blocking(fds[0]);
622 len = read_arg_from_pipe(fds[0], buf, BIGPATHBUFLEN);
625 if (asprintf(&p, "RSYNC_REQUEST=%s", buf) > 0)
628 len = read_arg_from_pipe(fds[0], buf,
635 if (asprintf(&p, "RSYNC_ARG%d=%s", j, buf) > 0)
640 close(STDOUT_FILENO);
641 status = system(lp_prexfer_exec(i));
642 if (!WIFEXITED(status))
644 _exit(WEXITSTATUS(status));
647 set_blocking(fds[1]);
648 pre_exec_fd = fds[1];
656 * XXX: The 'use chroot' flag is a fairly reliable
657 * source of confusion, because it fails under two
658 * important circumstances: running as non-root,
659 * running on Win32 (or possibly others). On the
660 * other hand, if you are running as root, then it
661 * might be better to always use chroot.
663 * So, perhaps if we can't chroot we should just issue
664 * a warning, unless a "require chroot" flag is set,
665 * in which case we fail.
667 if (chroot(chroot_path)) {
668 rsyserr(FLOG, errno, "chroot %s failed", chroot_path);
669 io_printf(f_out, "@ERROR: chroot failed\n");
672 if (!change_dir(module_dir, CD_NORMAL))
677 if (!change_dir(module_dir, CD_NORMAL)) {
679 rsyserr(FLOG, errno, "chdir %s failed\n", module_dir);
680 io_printf(f_out, "@ERROR: chdir failed\n");
686 if ((munge_symlinks = lp_munge_symlinks(i)) < 0)
687 munge_symlinks = !use_chroot || module_dirlen;
688 if (munge_symlinks) {
690 if (do_stat(SYMLINK_PREFIX, &st) == 0 && S_ISDIR(st.st_mode)) {
691 rprintf(FLOG, "Symlink munging is unsupported when a %s directory exists.\n",
693 io_printf(f_out, "@ERROR: daemon security issue -- contact admin\n", name);
694 exit_cleanup(RERR_UNSUPPORTED);
699 /* XXXX: You could argue that if the daemon is started
700 * by a non-root user and they explicitly specify a
701 * gid, then we should try to change to that gid --
702 * this could be possible if it's already in their
703 * supplementary groups. */
705 /* TODO: Perhaps we need to document that if rsyncd is
706 * started by somebody other than root it will inherit
707 * all their supplementary groups. */
710 rsyserr(FLOG, errno, "setgid %d failed", (int)gid);
711 io_printf(f_out, "@ERROR: setgid failed\n");
714 #ifdef HAVE_SETGROUPS
715 /* Get rid of any supplementary groups this process
716 * might have inheristed. */
717 if (setgroups(1, &gid)) {
718 rsyserr(FLOG, errno, "setgroups failed");
719 io_printf(f_out, "@ERROR: setgroups failed\n");
725 rsyserr(FLOG, errno, "setuid %d failed", (int)uid);
726 io_printf(f_out, "@ERROR: setuid failed\n");
730 am_root = (MY_UID() == 0);
733 if (lp_temp_dir(i) && *lp_temp_dir(i)) {
734 tmpdir = lp_temp_dir(i);
735 if (strlen(tmpdir) >= MAXPATHLEN - 10) {
737 "the 'temp dir' value for %s is WAY too long -- ignoring.\n",
743 io_printf(f_out, "@RSYNCD: OK\n");
745 read_args(f_in, name, line, sizeof line, rl_nulls, &argv, &argc, &request);
748 reset_output_levels(); /* future verbosity is controlled by client options */
749 ret = parse_arguments(&argc, (const char ***) &argv);
750 if (protect_args && ret) {
751 orig_early_argv = orig_argv;
753 read_args(f_in, name, line, sizeof line, 1, &argv, &argc, &request);
755 ret = parse_arguments(&argc, (const char ***) &argv);
757 orig_early_argv = NULL;
760 err_msg = finish_pre_exec(pre_exec_pid, pre_exec_fd, request,
761 orig_early_argv, orig_argv);
765 free(orig_early_argv);
767 am_server = 1; /* Don't let someone try to be tricky. */
769 if (lp_ignore_errors(module_id))
774 if (lp_fake_super(i)) {
775 if (preserve_xattrs > 1)
778 } else if (am_root < 0) /* Treat --fake-super from client as --super. */
781 if (filesfrom_fd == 0)
786 rprintf(FLOG, "rsync %s %s from %s@%s (%s)\n",
787 am_sender ? "on" : "to",
788 request, auth_user, host, addr);
790 rprintf(FLOG, "rsync %s %s from %s (%s)\n",
791 am_sender ? "on" : "to",
792 request, host, addr);
798 /* don't allow the logs to be flooded too fast */
799 limit_output_verbosity(lp_max_verbosity(i));
802 if (protocol_version < 23
803 && (protocol_version == 22 || am_sender))
804 io_start_multiplex_out();
805 else if (!ret || err_msg) {
806 /* We have to get I/O multiplexing started so that we can
807 * get the error back to the client. This means getting
808 * the protocol setup finished first in later versions. */
809 setup_protocol(f_out, f_in);
811 /* Since we failed in our option parsing, we may not
812 * have finished parsing that the client sent us a
813 * --files-from option, so look for it manually.
814 * Without this, the socket would be in the wrong
815 * state for the upcoming error message. */
818 for (i = 0; i < argc; i++) {
819 if (strncmp(argv[i], "--files-from", 12) == 0) {
826 write_byte(f_out, 0);
828 io_start_multiplex_out();
831 if (!ret || err_msg) {
833 rwrite(FERROR, err_msg, strlen(err_msg), 0);
837 exit_cleanup(RERR_UNSUPPORTED);
842 if (ic_send != (iconv_t)-1) {
843 iconv_close(ic_send);
844 ic_send = (iconv_t)-1;
846 if (ic_recv != (iconv_t)-1) {
847 iconv_close(ic_recv);
848 ic_recv = (iconv_t)-1;
854 && (use_chroot ? lp_numeric_ids(i) != False : lp_numeric_ids(i) == True))
855 numeric_ids = -1; /* Set --numeric-ids w/o breaking protocol. */
857 if (lp_timeout(i) && lp_timeout(i) > io_timeout)
858 set_io_timeout(lp_timeout(i));
860 /* If we have some incoming/outgoing chmod changes, append them to
861 * any user-specified changes (making our changes have priority).
862 * We also get a pointer to just our changes so that a receiver
863 * process can use them separately if --perms wasn't specified. */
865 p = lp_outgoing_chmod(i);
867 p = lp_incoming_chmod(i);
868 if (*p && !(daemon_chmod_modes = parse_chmod(p, &chmod_modes))) {
869 rprintf(FLOG, "Invalid \"%sing chmod\" directive: %s\n",
870 am_sender ? "outgo" : "incom", p);
873 start_server(f_in, f_out, argc, argv);
878 /* send a list of available modules to the client. Don't list those
879 with "list = False". */
880 static void send_listing(int fd)
882 int n = lp_num_modules();
885 for (i = 0; i < n; i++) {
887 io_printf(fd, "%-15s\t%s\n", lp_name(i), lp_comment(i));
890 if (protocol_version >= 25)
891 io_printf(fd,"@RSYNCD: EXIT\n");
894 static int load_config(int globals_only)
897 if (am_server && am_root <= 0)
898 config_file = RSYNCD_USERCONF;
900 config_file = RSYNCD_SYSCONF;
902 return lp_load(config_file, globals_only);
905 /* this is called when a connection is established to a client
906 and we want to start talking. The setup of the system is done from
908 int start_daemon(int f_in, int f_out)
914 io_set_sock_fds(f_in, f_out);
916 /* We must load the config file before calling any function that
917 * might cause log-file output to occur. This ensures that the
918 * "log file" param gets honored for the 2 non-forked use-cases
919 * (when rsync is run by init and run by a remote shell). */
921 exit_cleanup(RERR_SYNTAX);
923 addr = client_addr(f_in);
924 host = client_name(f_in);
925 rprintf(FLOG, "connect from %s (%s)\n", host, addr);
928 set_socket_options(f_in, "SO_KEEPALIVE");
929 set_nonblocking(f_in);
932 if (exchange_protocols(f_in, f_out, line, sizeof line, 0) < 0)
936 if (!read_line_old(f_in, line, sizeof line))
939 if (!*line || strcmp(line, "#list") == 0) {
940 rprintf(FLOG, "module-list request from %s (%s)\n",
947 /* it's some sort of command that I don't understand */
948 io_printf(f_out, "@ERROR: Unknown command '%s'\n", line);
952 if ((i = lp_number(line)) < 0) {
953 rprintf(FLOG, "unknown module '%s' tried from %s (%s)\n",
955 io_printf(f_out, "@ERROR: Unknown module '%s'\n", line);
959 #ifdef HAVE_SIGACTION
960 sigact.sa_flags = SA_NOCLDSTOP;
962 SIGACTION(SIGCHLD, remember_children);
964 return rsync_module(f_in, f_out, i, addr, host);
967 static void create_pid_file(void)
969 char *pid_file = lp_pid_file();
971 pid_t pid = getpid();
974 if (!pid_file || !*pid_file)
977 cleanup_set_pid(pid);
978 if ((fd = do_open(pid_file, O_WRONLY|O_CREAT|O_EXCL, 0666 & ~orig_umask)) == -1) {
980 fprintf(stderr, "failed to create pid file %s: %s\n", pid_file, strerror(errno));
981 rsyserr(FLOG, errno, "failed to create pid file %s", pid_file);
982 exit_cleanup(RERR_FILEIO);
984 snprintf(pidbuf, sizeof pidbuf, "%ld\n", (long)pid);
985 write(fd, pidbuf, strlen(pidbuf));
989 /* Become a daemon, discarding the controlling terminal. */
990 static void become_daemon(void)
997 fprintf(stderr, "failed to fork: %s\n", strerror(errno));
998 exit_cleanup(RERR_FILEIO);
1005 /* detach from the terminal */
1008 #elif defined TIOCNOTTY
1009 i = open("/dev/tty", O_RDWR);
1011 ioctl(i, (int)TIOCNOTTY, (char *)0);
1015 /* make sure that stdin, stdout an stderr don't stuff things
1016 * up (library functions, for example) */
1017 for (i = 0; i < 3; i++) {
1019 open("/dev/null", O_RDWR);
1023 int daemon_main(void)
1025 if (is_a_socket(STDIN_FILENO)) {
1028 /* we are running via inetd - close off stdout and
1029 * stderr so that library functions (and getopt) don't
1030 * try to use them. Redirect them to /dev/null */
1031 for (i = 1; i < 3; i++) {
1033 open("/dev/null", O_RDWR);
1036 return start_daemon(STDIN_FILENO, STDIN_FILENO);
1039 if (!load_config(1)) {
1040 fprintf(stderr, "Failed to parse config file: %s\n", config_file);
1041 exit_cleanup(RERR_SYNTAX);
1049 if (rsync_port == 0 && (rsync_port = lp_rsync_port()) == 0)
1050 rsync_port = RSYNC_PORT;
1051 if (bind_address == NULL && *lp_bind_address())
1052 bind_address = lp_bind_address();
1056 rprintf(FLOG, "rsyncd version %s starting, listening on port %d\n",
1057 RSYNC_VERSION, rsync_port);
1058 /* TODO: If listening on a particular address, then show that
1059 * address too. In fact, why not just do inet_ntop on the
1060 * local address??? */
1062 start_accept_loop(rsync_port, start_daemon);