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 munge_symlinks;
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;
59 extern char curr_dir[MAXPATHLEN];
61 extern char *iconv_opt;
62 extern iconv_t ic_send, ic_recv;
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 int save_munge_symlinks;
408 pid_t pre_exec_pid = 0;
409 char *request = NULL;
412 iconv_opt = lp_charset(i);
418 if (!allow_access(addr, host, lp_hosts_allow(i), lp_hosts_deny(i))) {
419 rprintf(FLOG, "rsync denied on module %s from %s (%s)\n",
422 io_printf(f_out, "@ERROR: Unknown module '%s'\n", name);
425 "@ERROR: access denied to %s from %s (%s)\n",
431 if (am_daemon && am_server) {
432 rprintf(FLOG, "rsync allowed access on module %s from %s (%s)\n",
436 if (!claim_connection(lp_lock_file(i), lp_max_connections(i))) {
438 rsyserr(FLOG, errno, "failed to open lock file %s",
440 io_printf(f_out, "@ERROR: failed to open lock file\n");
442 rprintf(FLOG, "max connections (%d) reached\n",
443 lp_max_connections(i));
444 io_printf(f_out, "@ERROR: max connections (%d) reached -- try again later\n",
445 lp_max_connections(i));
450 auth_user = auth_server(f_in, f_out, i, host, addr, "@RSYNCD: AUTHREQD ");
453 io_printf(f_out, "@ERROR: auth failed on module %s\n", name);
462 if (lp_transfer_logging(i) && !logfile_format)
463 logfile_format = lp_log_format(i);
464 if (log_format_has(logfile_format, 'i'))
465 logfile_format_has_i = 1;
466 if (logfile_format_has_i || log_format_has(logfile_format, 'o'))
467 logfile_format_has_o_or_i = 1;
469 am_root = (MY_UID() == 0);
473 if (!name_to_uid(p, &uid)) {
475 rprintf(FLOG, "Invalid uid %s\n", p);
476 io_printf(f_out, "@ERROR: invalid uid %s\n", p);
483 if (!name_to_gid(p, &gid)) {
485 rprintf(FLOG, "Invalid gid %s\n", p);
486 io_printf(f_out, "@ERROR: invalid gid %s\n", p);
493 /* TODO: If we're not root, but the configuration requests
494 * that we change to some uid other than the current one, then
497 /* TODO: Perhaps take a list of gids, and make them into the
498 * supplementary groups. */
500 module_dir = lp_path(i);
502 if ((p = strstr(module_dir, "/./")) != NULL) {
505 } else if ((p = strdup("/")) == NULL) /* MEMORY LEAK */
506 out_of_memory("rsync_module");
509 /* We do a change_dir() that doesn't actually call chdir()
510 * just to make a relative path absolute. */
511 strlcpy(line, curr_dir, sizeof line);
512 if (!change_dir(module_dir, CD_SKIP_CHDIR))
514 if (strcmp(curr_dir, module_dir) != 0
515 && (module_dir = strdup(curr_dir)) == NULL)
516 out_of_memory("rsync_module");
517 change_dir(line, CD_SKIP_CHDIR); /* Restore curr_dir. */
520 chroot_path = module_dir;
521 module_dir = p; /* p is "/" or our inside-chroot path */
523 module_dirlen = clean_fname(module_dir, CFN_COLLAPSE_DOT_DOT_DIRS | CFN_DROP_TRAILING_DOT_DIR);
525 if (module_dirlen == 1) {
527 set_filter_dir("/", 1);
529 set_filter_dir(module_dir, module_dirlen);
532 parse_rule(&daemon_filter_list, p, MATCHFLG_WORD_SPLIT,
533 XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3);
535 p = lp_include_from(i);
536 parse_filter_file(&daemon_filter_list, p, MATCHFLG_INCLUDE,
537 XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3 | XFLG_OLD_PREFIXES | XFLG_FATAL_ERRORS);
540 parse_rule(&daemon_filter_list, p,
541 MATCHFLG_INCLUDE | MATCHFLG_WORD_SPLIT,
542 XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3 | XFLG_OLD_PREFIXES);
544 p = lp_exclude_from(i);
545 parse_filter_file(&daemon_filter_list, p, 0,
546 XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3 | XFLG_OLD_PREFIXES | XFLG_FATAL_ERRORS);
549 parse_rule(&daemon_filter_list, p, MATCHFLG_WORD_SPLIT,
550 XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3 | XFLG_OLD_PREFIXES);
555 if (*lp_prexfer_exec(i) || *lp_postxfer_exec(i)) {
556 char *modname, *modpath, *hostaddr, *hostname, *username;
561 else if (module_dirlen) {
562 pathjoin(line, sizeof line, chroot_path, module_dir+1);
567 if (asprintf(&modname, "RSYNC_MODULE_NAME=%s", name) < 0
568 || asprintf(&modpath, "RSYNC_MODULE_PATH=%s", p) < 0
569 || asprintf(&hostaddr, "RSYNC_HOST_ADDR=%s", addr) < 0
570 || asprintf(&hostname, "RSYNC_HOST_NAME=%s", host) < 0
571 || asprintf(&username, "RSYNC_USER_NAME=%s", auth_user) < 0)
572 out_of_memory("rsync_module");
579 /* For post-xfer exec, fork a new process to run the rsync
580 * daemon while this process waits for the exit status and
581 * runs the indicated command at that point. */
582 if (*lp_postxfer_exec(i)) {
585 rsyserr(FLOG, errno, "fork failed");
586 io_printf(f_out, "@ERROR: fork failed\n");
590 if (asprintf(&p, "RSYNC_PID=%ld", (long)pid) > 0)
592 if (wait_process(pid, &status, 0) < 0)
594 if (asprintf(&p, "RSYNC_RAW_STATUS=%d", status) > 0)
596 if (WIFEXITED(status))
597 status = WEXITSTATUS(status);
600 if (asprintf(&p, "RSYNC_EXIT_STATUS=%d", status) > 0)
602 system(lp_postxfer_exec(i));
606 /* For pre-xfer exec, fork a child process to run the indicated
607 * command, though it first waits for the parent process to
608 * send us the user's request via a pipe. */
609 if (*lp_prexfer_exec(i)) {
611 if (asprintf(&p, "RSYNC_PID=%ld", (long)getpid()) > 0)
613 if (pipe(fds) < 0 || (pre_exec_pid = fork()) < 0) {
614 rsyserr(FLOG, errno, "pre-xfer exec preparation failed");
615 io_printf(f_out, "@ERROR: pre-xfer exec preparation failed\n");
618 if (pre_exec_pid == 0) {
619 char buf[BIGPATHBUFLEN];
622 set_blocking(fds[0]);
623 len = read_arg_from_pipe(fds[0], buf, BIGPATHBUFLEN);
626 if (asprintf(&p, "RSYNC_REQUEST=%s", buf) > 0)
629 len = read_arg_from_pipe(fds[0], buf,
636 if (asprintf(&p, "RSYNC_ARG%d=%s", j, buf) > 0)
641 close(STDOUT_FILENO);
642 status = system(lp_prexfer_exec(i));
643 if (!WIFEXITED(status))
645 _exit(WEXITSTATUS(status));
648 set_blocking(fds[1]);
649 pre_exec_fd = fds[1];
657 * XXX: The 'use chroot' flag is a fairly reliable
658 * source of confusion, because it fails under two
659 * important circumstances: running as non-root,
660 * running on Win32 (or possibly others). On the
661 * other hand, if you are running as root, then it
662 * might be better to always use chroot.
664 * So, perhaps if we can't chroot we should just issue
665 * a warning, unless a "require chroot" flag is set,
666 * in which case we fail.
668 if (chroot(chroot_path)) {
669 rsyserr(FLOG, errno, "chroot %s failed", chroot_path);
670 io_printf(f_out, "@ERROR: chroot failed\n");
673 if (!change_dir(module_dir, CD_NORMAL))
678 if (!change_dir(module_dir, CD_NORMAL)) {
680 rsyserr(FLOG, errno, "chdir %s failed\n", module_dir);
681 io_printf(f_out, "@ERROR: chdir failed\n");
687 if ((munge_symlinks = lp_munge_symlinks(i)) < 0)
688 munge_symlinks = !use_chroot || module_dirlen;
689 if (munge_symlinks) {
691 char prefix[SYMLINK_PREFIX_LEN]; /* NOT +1 ! */
692 strlcpy(prefix, SYMLINK_PREFIX, sizeof prefix); /* trim the trailing slash */
693 if (do_stat(prefix, &st) == 0 && S_ISDIR(st.st_mode)) {
694 rprintf(FLOG, "Symlink munging is unsafe when a %s directory exists.\n",
696 io_printf(f_out, "@ERROR: daemon security issue -- contact admin\n", name);
697 exit_cleanup(RERR_UNSUPPORTED);
702 /* XXXX: You could argue that if the daemon is started
703 * by a non-root user and they explicitly specify a
704 * gid, then we should try to change to that gid --
705 * this could be possible if it's already in their
706 * supplementary groups. */
708 /* TODO: Perhaps we need to document that if rsyncd is
709 * started by somebody other than root it will inherit
710 * all their supplementary groups. */
713 rsyserr(FLOG, errno, "setgid %d failed", (int)gid);
714 io_printf(f_out, "@ERROR: setgid failed\n");
717 #ifdef HAVE_SETGROUPS
718 /* Get rid of any supplementary groups this process
719 * might have inheristed. */
720 if (setgroups(1, &gid)) {
721 rsyserr(FLOG, errno, "setgroups failed");
722 io_printf(f_out, "@ERROR: setgroups failed\n");
728 rsyserr(FLOG, errno, "setuid %d failed", (int)uid);
729 io_printf(f_out, "@ERROR: setuid failed\n");
733 am_root = (MY_UID() == 0);
736 if (lp_temp_dir(i) && *lp_temp_dir(i)) {
737 tmpdir = lp_temp_dir(i);
738 if (strlen(tmpdir) >= MAXPATHLEN - 10) {
740 "the 'temp dir' value for %s is WAY too long -- ignoring.\n",
746 io_printf(f_out, "@RSYNCD: OK\n");
748 read_args(f_in, name, line, sizeof line, rl_nulls, &argv, &argc, &request);
751 save_munge_symlinks = munge_symlinks;
753 reset_output_levels(); /* future verbosity is controlled by client options */
754 ret = parse_arguments(&argc, (const char ***) &argv);
755 if (protect_args && ret) {
756 orig_early_argv = orig_argv;
758 read_args(f_in, name, line, sizeof line, 1, &argv, &argc, &request);
760 ret = parse_arguments(&argc, (const char ***) &argv);
762 orig_early_argv = NULL;
764 munge_symlinks = save_munge_symlinks; /* The client mustn't control this. */
767 err_msg = finish_pre_exec(pre_exec_pid, pre_exec_fd, request,
768 orig_early_argv, orig_argv);
772 free(orig_early_argv);
774 am_server = 1; /* Don't let someone try to be tricky. */
776 if (lp_ignore_errors(module_id))
781 if (lp_fake_super(i)) {
782 if (preserve_xattrs > 1)
785 } else if (am_root < 0) /* Treat --fake-super from client as --super. */
788 if (filesfrom_fd == 0)
793 rprintf(FLOG, "rsync %s %s from %s@%s (%s)\n",
794 am_sender ? "on" : "to",
795 request, auth_user, host, addr);
797 rprintf(FLOG, "rsync %s %s from %s (%s)\n",
798 am_sender ? "on" : "to",
799 request, host, addr);
805 /* don't allow the logs to be flooded too fast */
806 limit_output_verbosity(lp_max_verbosity(i));
809 if (protocol_version < 23
810 && (protocol_version == 22 || am_sender))
811 io_start_multiplex_out();
812 else if (!ret || err_msg) {
813 /* We have to get I/O multiplexing started so that we can
814 * get the error back to the client. This means getting
815 * the protocol setup finished first in later versions. */
816 setup_protocol(f_out, f_in);
818 /* Since we failed in our option parsing, we may not
819 * have finished parsing that the client sent us a
820 * --files-from option, so look for it manually.
821 * Without this, the socket would be in the wrong
822 * state for the upcoming error message. */
825 for (i = 0; i < argc; i++) {
826 if (strncmp(argv[i], "--files-from", 12) == 0) {
833 write_byte(f_out, 0);
835 io_start_multiplex_out();
838 if (!ret || err_msg) {
840 rwrite(FERROR, err_msg, strlen(err_msg), 0);
844 exit_cleanup(RERR_UNSUPPORTED);
849 if (ic_send != (iconv_t)-1) {
850 iconv_close(ic_send);
851 ic_send = (iconv_t)-1;
853 if (ic_recv != (iconv_t)-1) {
854 iconv_close(ic_recv);
855 ic_recv = (iconv_t)-1;
861 && (use_chroot ? lp_numeric_ids(i) != False : lp_numeric_ids(i) == True))
862 numeric_ids = -1; /* Set --numeric-ids w/o breaking protocol. */
864 if (lp_timeout(i) && lp_timeout(i) > io_timeout)
865 set_io_timeout(lp_timeout(i));
867 /* If we have some incoming/outgoing chmod changes, append them to
868 * any user-specified changes (making our changes have priority).
869 * We also get a pointer to just our changes so that a receiver
870 * process can use them separately if --perms wasn't specified. */
872 p = lp_outgoing_chmod(i);
874 p = lp_incoming_chmod(i);
875 if (*p && !(daemon_chmod_modes = parse_chmod(p, &chmod_modes))) {
876 rprintf(FLOG, "Invalid \"%sing chmod\" directive: %s\n",
877 am_sender ? "outgo" : "incom", p);
880 start_server(f_in, f_out, argc, argv);
885 /* send a list of available modules to the client. Don't list those
886 with "list = False". */
887 static void send_listing(int fd)
889 int n = lp_num_modules();
892 for (i = 0; i < n; i++) {
894 io_printf(fd, "%-15s\t%s\n", lp_name(i), lp_comment(i));
897 if (protocol_version >= 25)
898 io_printf(fd,"@RSYNCD: EXIT\n");
901 static int load_config(int globals_only)
904 if (am_server && am_root <= 0)
905 config_file = RSYNCD_USERCONF;
907 config_file = RSYNCD_SYSCONF;
909 return lp_load(config_file, globals_only);
912 /* this is called when a connection is established to a client
913 and we want to start talking. The setup of the system is done from
915 int start_daemon(int f_in, int f_out)
921 io_set_sock_fds(f_in, f_out);
923 /* We must load the config file before calling any function that
924 * might cause log-file output to occur. This ensures that the
925 * "log file" param gets honored for the 2 non-forked use-cases
926 * (when rsync is run by init and run by a remote shell). */
928 exit_cleanup(RERR_SYNTAX);
930 addr = client_addr(f_in);
931 host = client_name(f_in);
932 rprintf(FLOG, "connect from %s (%s)\n", host, addr);
935 set_socket_options(f_in, "SO_KEEPALIVE");
936 set_nonblocking(f_in);
939 if (exchange_protocols(f_in, f_out, line, sizeof line, 0) < 0)
943 if (!read_line_old(f_in, line, sizeof line))
946 if (!*line || strcmp(line, "#list") == 0) {
947 rprintf(FLOG, "module-list request from %s (%s)\n",
954 /* it's some sort of command that I don't understand */
955 io_printf(f_out, "@ERROR: Unknown command '%s'\n", line);
959 if ((i = lp_number(line)) < 0) {
960 rprintf(FLOG, "unknown module '%s' tried from %s (%s)\n",
962 io_printf(f_out, "@ERROR: Unknown module '%s'\n", line);
966 #ifdef HAVE_SIGACTION
967 sigact.sa_flags = SA_NOCLDSTOP;
969 SIGACTION(SIGCHLD, remember_children);
971 return rsync_module(f_in, f_out, i, addr, host);
974 static void create_pid_file(void)
976 char *pid_file = lp_pid_file();
978 pid_t pid = getpid();
981 if (!pid_file || !*pid_file)
984 cleanup_set_pid(pid);
985 if ((fd = do_open(pid_file, O_WRONLY|O_CREAT|O_EXCL, 0666 & ~orig_umask)) == -1) {
987 fprintf(stderr, "failed to create pid file %s: %s\n", pid_file, strerror(errno));
988 rsyserr(FLOG, errno, "failed to create pid file %s", pid_file);
989 exit_cleanup(RERR_FILEIO);
991 snprintf(pidbuf, sizeof pidbuf, "%ld\n", (long)pid);
992 write(fd, pidbuf, strlen(pidbuf));
996 /* Become a daemon, discarding the controlling terminal. */
997 static void become_daemon(void)
1004 fprintf(stderr, "failed to fork: %s\n", strerror(errno));
1005 exit_cleanup(RERR_FILEIO);
1012 /* detach from the terminal */
1015 #elif defined TIOCNOTTY
1016 i = open("/dev/tty", O_RDWR);
1018 ioctl(i, (int)TIOCNOTTY, (char *)0);
1022 /* make sure that stdin, stdout an stderr don't stuff things
1023 * up (library functions, for example) */
1024 for (i = 0; i < 3; i++) {
1026 open("/dev/null", O_RDWR);
1030 int daemon_main(void)
1032 if (is_a_socket(STDIN_FILENO)) {
1035 /* we are running via inetd - close off stdout and
1036 * stderr so that library functions (and getopt) don't
1037 * try to use them. Redirect them to /dev/null */
1038 for (i = 1; i < 3; i++) {
1040 open("/dev/null", O_RDWR);
1043 return start_daemon(STDIN_FILENO, STDIN_FILENO);
1046 if (!load_config(1)) {
1047 fprintf(stderr, "Failed to parse config file: %s\n", config_file);
1048 exit_cleanup(RERR_SYNTAX);
1057 if (rsync_port == 0 && (rsync_port = lp_rsync_port()) == 0)
1058 rsync_port = RSYNC_PORT;
1059 if (bind_address == NULL && *lp_bind_address())
1060 bind_address = lp_bind_address();
1064 rprintf(FLOG, "rsyncd version %s starting, listening on port %d\n",
1065 RSYNC_VERSION, rsync_port);
1066 /* TODO: If listening on a particular address, then show that
1067 * address too. In fact, why not just do inet_ntop on the
1068 * local address??? */
1070 start_accept_loop(rsync_port, start_daemon);