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.
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 filter_rule_list daemon_filter_list;
60 extern char *iconv_opt;
61 extern iconv_t ic_send, ic_recv;
64 #define MAX_GID_LIST 32
69 struct chmod_mode_struct *daemon_chmod_modes;
71 /* module_dirlen is the length of the module_dir string when in daemon
72 * mode and module_dir is not "/"; otherwise 0. (Note that a chroot-
73 * enabled module can have a non-"/" module_dir these days.) */
74 char *module_dir = NULL;
75 unsigned int module_dirlen = 0;
77 char *full_module_path;
79 static int rl_nulls = 0;
82 static struct sigaction sigact;
85 static gid_t gid_list[MAX_GID_LIST];
86 static int gid_count = 0;
88 /* Used when "reverse lookup" is off. */
89 const char undetermined_hostname[] = "UNDETERMINED";
92 * Run a client connected to an rsyncd. The alternative to this
93 * function for remote-shell connections is do_cmd().
95 * After negotiating which module to use and reading the server's
96 * motd, this hands over to client_run(). Telling the server the
97 * module will cause it to chroot/setuid/etc.
99 * Instead of doing a transfer, the client may at this stage instead
100 * get a listing of remote modules and exit.
102 * @return -1 for error in startup, or the result of client_run().
103 * Either way, it eventually gets passed to exit_cleanup().
105 int start_socket_client(char *host, int remote_argc, char *remote_argv[],
106 int argc, char *argv[])
109 char *p, *user = NULL;
111 /* This is redundant with code in start_inband_exchange(), but this
112 * short-circuits a problem in the client before we open a socket,
113 * and the extra check won't hurt. */
114 if (**remote_argv == '/') {
116 "ERROR: The remote path must start with a module name not a /\n");
120 if ((p = strrchr(host, '@')) != NULL) {
126 fd = open_socket_out_wrapped(host, rsync_port, bind_address,
129 exit_cleanup(RERR_SOCKETIO);
135 ret = start_inband_exchange(fd, fd, user, remote_argc, remote_argv);
137 return ret ? ret : client_run(fd, fd, -1, argc, argv);
140 static int exchange_protocols(int f_in, int f_out, char *buf, size_t bufsiz, int am_client)
143 #if SUBPROTOCOL_VERSION != 0
144 int our_sub = protocol_version < PROTOCOL_VERSION ? 0 : SUBPROTOCOL_VERSION;
150 io_printf(f_out, "@RSYNCD: %d.%d\n", protocol_version, our_sub);
153 motd = lp_motd_file();
155 FILE *f = fopen(motd,"r");
156 while (f && !feof(f)) {
157 int len = fread(buf, 1, bufsiz - 1, f);
159 write_buf(f_out, buf, len);
163 write_sbuf(f_out, "\n");
167 /* This strips the \n. */
168 if (!read_line_old(f_in, buf, bufsiz)) {
170 rprintf(FERROR, "rsync: did not see server greeting\n");
174 if (sscanf(buf, "@RSYNCD: %d.%d", &remote_protocol, &remote_sub) < 1) {
176 rprintf(FERROR, "rsync: server sent \"%s\" rather than greeting\n", buf);
178 io_printf(f_out, "@ERROR: protocol startup error\n");
182 if (remote_sub < 0) {
183 if (remote_protocol == 30) {
185 rprintf(FERROR, "rsync: server is speaking an incompatible beta of protocol 30\n");
187 io_printf(f_out, "@ERROR: your client is speaking an incompatible beta of protocol 30\n");
193 if (protocol_version > remote_protocol) {
194 protocol_version = remote_protocol;
197 } else if (protocol_version == remote_protocol) {
198 if (remote_sub != our_sub)
201 #if SUBPROTOCOL_VERSION != 0
202 else if (protocol_version < remote_protocol) {
208 if (protocol_version >= 30)
214 int start_inband_exchange(int f_in, int f_out, const char *user, int argc, char *argv[])
217 char line[BIGPATHBUFLEN];
218 char *sargs[MAX_ARGS];
222 assert(argc > 0 && *argv != NULL);
226 "ERROR: The remote path must start with a module name\n");
230 if (!(p = strchr(*argv, '/')))
231 modlen = strlen(*argv);
235 if (!(modname = new_array(char, modlen+1+1))) /* room for '/' & '\0' */
236 out_of_memory("start_inband_exchange");
237 strlcpy(modname, *argv, modlen + 1);
238 modname[modlen] = '/';
239 modname[modlen+1] = '\0';
242 user = getenv("USER");
244 user = getenv("LOGNAME");
246 if (exchange_protocols(f_in, f_out, line, sizeof line, 1) < 0)
249 /* set daemon_over_rsh to false since we need to build the
250 * true set of args passed through the rsh/ssh connection;
251 * this is a no-op for direct-socket-connection mode */
253 server_options(sargs, &sargc);
255 if (sargc >= MAX_ARGS - 2)
258 sargs[sargc++] = ".";
261 if (sargc >= MAX_ARGS - 1) {
263 rprintf(FERROR, "internal: args[] overflowed in do_cmd()\n");
264 exit_cleanup(RERR_SYNTAX);
266 if (strncmp(*argv, modname, modlen) == 0
267 && argv[0][modlen] == '\0')
268 sargs[sargc++] = modname; /* we send "modname/" */
270 sargs[sargc++] = *argv;
277 if (DEBUG_GTE(CMD, 1))
278 print_child_argv("sending daemon args:", sargs);
280 io_printf(f_out, "%.*s\n", modlen, modname);
282 /* Old servers may just drop the connection here,
283 rather than sending a proper EXIT command. Yuck. */
284 kluge_around_eof = list_only && protocol_version < 25 ? 1 : 0;
287 if (!read_line_old(f_in, line, sizeof line)) {
288 rprintf(FERROR, "rsync: didn't get server startup line\n");
292 if (strncmp(line,"@RSYNCD: AUTHREQD ",18) == 0) {
293 auth_client(f_out, user, line+18);
297 if (strcmp(line,"@RSYNCD: OK") == 0)
300 if (strcmp(line,"@RSYNCD: EXIT") == 0) {
301 /* This is sent by recent versions of the
302 * server to terminate the listing of modules.
303 * We don't want to go on and transfer
304 * anything; just exit. */
308 if (strncmp(line, "@ERROR", 6) == 0) {
309 rprintf(FERROR, "%s\n", line);
310 /* This is always fatal; the server will now
311 * close the socket. */
315 /* This might be a MOTD line or a module listing, but there is
316 * no way to differentiate it. The manpage mentions this. */
318 rprintf(FINFO, "%s\n", line);
320 kluge_around_eof = 0;
323 for (i = 0; i < sargc; i++) {
324 if (!sargs[i]) /* stop at --protect-args NULL */
326 write_sbuf(f_out, sargs[i]);
327 write_byte(f_out, 0);
329 write_byte(f_out, 0);
331 for (i = 0; i < sargc; i++)
332 io_printf(f_out, "%s\n", sargs[i]);
333 write_sbuf(f_out, "\n");
337 send_protected_args(f_out, sargs);
339 if (protocol_version < 23) {
340 if (protocol_version == 22 || !am_sender)
341 io_start_multiplex_in(f_in);
349 static char *finish_pre_exec(pid_t pid, int fd, char *request,
350 char **early_argv, char **argv)
352 int j = 0, status = -1;
357 write_buf(fd, request, strlen(request)+1);
359 for ( ; *early_argv; early_argv++)
360 write_buf(fd, *early_argv, strlen(*early_argv)+1);
361 j = 1; /* Skip arg0 name in argv. */
363 for ( ; argv[j]; j++) {
364 write_buf(fd, argv[j], strlen(argv[j])+1);
365 if (argv[j][0] == '.' && argv[j][1] == '\0')
372 if (wait_process(pid, &status, 0) < 0
373 || !WIFEXITED(status) || WEXITSTATUS(status) != 0) {
375 if (asprintf(&e, "pre-xfer exec returned failure (%d)%s%s\n",
376 status, status < 0 ? ": " : "",
377 status < 0 ? strerror(errno) : "") < 0)
378 out_of_memory("finish_pre_exec");
385 static int read_arg_from_pipe(int fd, char *buf, int limit)
387 char *bp = buf, *eob = buf + limit - 1;
390 int got = read(fd, bp, 1);
392 if (got < 0 && errno == EINTR)
407 static int path_failure(int f_out, const char *dir, BOOL was_chdir)
410 rsyserr(FLOG, errno, "chdir %s failed\n", dir);
412 rprintf(FLOG, "normalize_path(%s) failed\n", dir);
413 io_printf(f_out, "@ERROR: chdir failed\n");
417 static int add_a_group(int f_out, const char *gname)
420 if (!group_to_gid(gname, &gid, True)) {
421 rprintf(FLOG, "Invalid gid %s\n", gname);
422 io_printf(f_out, "@ERROR: invalid gid %s\n", gname);
425 if (gid_count == MAX_GID_LIST) {
426 rprintf(FLOG, "Too many groups specified via gid parameter.\n");
427 io_printf(f_out, "@ERROR: too many groups\n");
430 gid_list[gid_count++] = gid;
434 #ifdef HAVE_GETGROUPLIST
435 static int want_all_groups(int f_out, uid_t uid)
438 gid_count = MAX_GID_LIST;
439 if ((err = getallgroups(uid, gid_list, &gid_count)) != NULL) {
440 rsyserr(FLOG, errno, "%s", err);
441 io_printf(f_out, "@ERROR: %s\n", err);
446 #elif defined HAVE_INITGROUPS
447 static struct passwd *want_all_groups(int f_out, uid_t uid)
450 if ((pw = getpwuid(uid)) == NULL) {
451 rsyserr(FLOG, errno, "getpwuid failed");
452 io_printf(f_out, "@ERROR: getpwuid failed\n");
455 /* Start with the default group and initgroups() will add the reset. */
457 gid_list[0] = pw->pw_gid;
462 static void set_env_str(const char *var, const char *str)
466 if (asprintf(&mem, "%s=%s", var, str) < 0)
467 out_of_memory("set_env_str");
473 static void set_env_num(const char *var, long num)
476 if (asprintf(&mem, "%s=%ld", var, num) < 0)
477 out_of_memory("set_env_num");
482 static int rsync_module(int f_in, int f_out, int i, const char *addr, const char *host)
485 char **argv, **orig_argv, **orig_early_argv, *module_chdir;
486 char line[BIGPATHBUFLEN];
487 #if defined HAVE_INITGROUPS && !defined HAVE_GETGROUPLIST
488 struct passwd *pw = NULL;
492 char *p, *err_msg = NULL;
493 char *name = lp_name(i);
494 int use_chroot = lp_use_chroot(i);
495 int ret, pre_exec_fd = -1;
496 int save_munge_symlinks;
497 pid_t pre_exec_pid = 0;
498 char *request = NULL;
500 set_env_str("RSYNC_MODULE_NAME", name);
503 iconv_opt = lp_charset(i);
509 /* If reverse lookup is disabled globally but enabled for this module,
510 * we need to do it now before the access check. */
511 if (host == undetermined_hostname && lp_reverse_lookup(i))
512 host = client_name(f_in);
513 set_env_str("RSYNC_HOST_NAME", host);
514 set_env_str("RSYNC_HOST_ADDR", addr);
516 if (!allow_access(addr, host, lp_hosts_allow(i), lp_hosts_deny(i))) {
517 rprintf(FLOG, "rsync denied on module %s from %s (%s)\n",
520 io_printf(f_out, "@ERROR: Unknown module '%s'\n", name);
523 "@ERROR: access denied to %s from %s (%s)\n",
529 if (am_daemon && am_server) {
530 rprintf(FLOG, "rsync allowed access on module %s from %s (%s)\n",
534 if (!claim_connection(lp_lock_file(i), lp_max_connections(i))) {
536 rsyserr(FLOG, errno, "failed to open lock file %s",
538 io_printf(f_out, "@ERROR: failed to open lock file\n");
540 rprintf(FLOG, "max connections (%d) reached\n",
541 lp_max_connections(i));
542 io_printf(f_out, "@ERROR: max connections (%d) reached -- try again later\n",
543 lp_max_connections(i));
548 auth_user = auth_server(f_in, f_out, i, host, addr, "@RSYNCD: AUTHREQD ");
551 io_printf(f_out, "@ERROR: auth failed on module %s\n", name);
554 set_env_str("RSYNC_USER_NAME", auth_user);
561 if (lp_transfer_logging(i) && !logfile_format)
562 logfile_format = lp_log_format(i);
563 if (log_format_has(logfile_format, 'i'))
564 logfile_format_has_i = 1;
565 if (logfile_format_has_i || log_format_has(logfile_format, 'o'))
566 logfile_format_has_o_or_i = 1;
569 am_root = (uid == 0);
571 p = *lp_uid(i) ? lp_uid(i) : am_root ? NOBODY_USER : NULL;
573 if (!user_to_uid(p, &uid, True)) {
574 rprintf(FLOG, "Invalid uid %s\n", p);
575 io_printf(f_out, "@ERROR: invalid uid %s\n", p);
582 p = *lp_gid(i) ? strtok(lp_gid(i), ", ") : NULL;
584 /* The "*" gid must be the first item in the list. */
585 if (strcmp(p, "*") == 0) {
586 #ifdef HAVE_GETGROUPLIST
587 if (want_all_groups(f_out, uid) < 0)
589 #elif defined HAVE_INITGROUPS
590 if ((pw = want_all_groups(f_out, uid)) == NULL)
593 rprintf(FLOG, "This rsync does not support a gid of \"*\"\n");
594 io_printf(f_out, "@ERROR: invalid gid setting.\n");
597 } else if (add_a_group(f_out, p) < 0)
599 while ((p = strtok(NULL, ", ")) != NULL) {
600 #if defined HAVE_INITGROUPS && !defined HAVE_GETGROUPLIST
602 rprintf(FLOG, "This rsync cannot add groups after \"*\".\n");
603 io_printf(f_out, "@ERROR: invalid gid setting.\n");
607 if (add_a_group(f_out, p) < 0)
610 } else if (am_root) {
611 if (add_a_group(f_out, NOBODY_GROUP) < 0)
615 module_dir = lp_path(i);
617 if ((p = strstr(module_dir, "/./")) != NULL) {
618 *p = '\0'; /* Temporary... */
619 if (!(module_chdir = normalize_path(module_dir, True, NULL)))
620 return path_failure(f_out, module_dir, False);
622 if (!(p = normalize_path(p + 2, True, &module_dirlen)))
623 return path_failure(f_out, strstr(module_dir, "/./"), False);
624 if (!(full_module_path = normalize_path(module_dir, False, NULL)))
625 full_module_path = module_dir;
628 if (!(module_chdir = normalize_path(module_dir, False, NULL)))
629 return path_failure(f_out, module_dir, False);
630 full_module_path = module_chdir;
635 if (!(module_chdir = normalize_path(module_dir, False, &module_dirlen)))
636 return path_failure(f_out, module_dir, False);
637 full_module_path = module_dir = module_chdir;
639 set_env_str("RSYNC_MODULE_PATH", full_module_path);
641 if (module_dirlen == 1) {
643 set_filter_dir("/", 1);
645 set_filter_dir(module_dir, module_dirlen);
648 parse_filter_str(&daemon_filter_list, p, rule_template(FILTRULE_WORD_SPLIT),
649 XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3);
651 p = lp_include_from(i);
652 parse_filter_file(&daemon_filter_list, p, rule_template(FILTRULE_INCLUDE),
653 XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3 | XFLG_OLD_PREFIXES | XFLG_FATAL_ERRORS);
656 parse_filter_str(&daemon_filter_list, p,
657 rule_template(FILTRULE_INCLUDE | FILTRULE_WORD_SPLIT),
658 XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3 | XFLG_OLD_PREFIXES);
660 p = lp_exclude_from(i);
661 parse_filter_file(&daemon_filter_list, p, rule_template(0),
662 XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3 | XFLG_OLD_PREFIXES | XFLG_FATAL_ERRORS);
665 parse_filter_str(&daemon_filter_list, p, rule_template(FILTRULE_WORD_SPLIT),
666 XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3 | XFLG_OLD_PREFIXES);
671 if (*lp_prexfer_exec(i) || *lp_postxfer_exec(i)) {
675 /* For post-xfer exec, fork a new process to run the rsync
676 * daemon while this process waits for the exit status and
677 * runs the indicated command at that point. */
678 if (*lp_postxfer_exec(i)) {
681 rsyserr(FLOG, errno, "fork failed");
682 io_printf(f_out, "@ERROR: fork failed\n");
686 set_env_num("RSYNC_PID", (long)pid);
687 if (wait_process(pid, &status, 0) < 0)
689 set_env_num("RSYNC_RAW_STATUS", status);
690 if (WIFEXITED(status))
691 status = WEXITSTATUS(status);
694 set_env_num("RSYNC_EXIT_STATUS", status);
695 if (system(lp_postxfer_exec(i)) < 0)
700 /* For pre-xfer exec, fork a child process to run the indicated
701 * command, though it first waits for the parent process to
702 * send us the user's request via a pipe. */
703 if (*lp_prexfer_exec(i)) {
705 set_env_num("RSYNC_PID", (long)getpid());
706 if (pipe(fds) < 0 || (pre_exec_pid = fork()) < 0) {
707 rsyserr(FLOG, errno, "pre-xfer exec preparation failed");
708 io_printf(f_out, "@ERROR: pre-xfer exec preparation failed\n");
711 if (pre_exec_pid == 0) {
712 char buf[BIGPATHBUFLEN];
715 set_blocking(fds[0]);
716 len = read_arg_from_pipe(fds[0], buf, BIGPATHBUFLEN);
719 set_env_str("RSYNC_REQUEST", buf);
721 len = read_arg_from_pipe(fds[0], buf,
728 if (asprintf(&p, "RSYNC_ARG%d=%s", j, buf) > 0)
733 close(STDOUT_FILENO);
734 status = system(lp_prexfer_exec(i));
735 if (!WIFEXITED(status))
737 _exit(WEXITSTATUS(status));
740 set_blocking(fds[1]);
741 pre_exec_fd = fds[1];
749 * XXX: The 'use chroot' flag is a fairly reliable
750 * source of confusion, because it fails under two
751 * important circumstances: running as non-root,
752 * running on Win32 (or possibly others). On the
753 * other hand, if you are running as root, then it
754 * might be better to always use chroot.
756 * So, perhaps if we can't chroot we should just issue
757 * a warning, unless a "require chroot" flag is set,
758 * in which case we fail.
760 if (chroot(module_chdir)) {
761 rsyserr(FLOG, errno, "chroot %s failed", module_chdir);
762 io_printf(f_out, "@ERROR: chroot failed\n");
765 module_chdir = module_dir;
768 if (!change_dir(module_chdir, CD_NORMAL))
769 return path_failure(f_out, module_chdir, True);
770 if (module_dirlen || !use_chroot)
773 if ((munge_symlinks = lp_munge_symlinks(i)) < 0)
774 munge_symlinks = !use_chroot || module_dirlen;
775 if (munge_symlinks) {
777 char prefix[SYMLINK_PREFIX_LEN]; /* NOT +1 ! */
778 strlcpy(prefix, SYMLINK_PREFIX, sizeof prefix); /* trim the trailing slash */
779 if (do_stat(prefix, &st) == 0 && S_ISDIR(st.st_mode)) {
780 rprintf(FLOG, "Symlink munging is unsafe when a %s directory exists.\n",
782 io_printf(f_out, "@ERROR: daemon security issue -- contact admin\n", name);
783 exit_cleanup(RERR_UNSUPPORTED);
788 if (setgid(gid_list[0])) {
789 rsyserr(FLOG, errno, "setgid %ld failed", (long)gid_list[0]);
790 io_printf(f_out, "@ERROR: setgid failed\n");
793 #ifdef HAVE_SETGROUPS
794 /* Set the group(s) we want to be active. */
795 if (setgroups(gid_count, gid_list)) {
796 rsyserr(FLOG, errno, "setgroups failed");
797 io_printf(f_out, "@ERROR: setgroups failed\n");
801 #if defined HAVE_INITGROUPS && !defined HAVE_GETGROUPLIST
802 /* pw is set if the user wants all the user's groups. */
803 if (pw && initgroups(pw->pw_name, pw->pw_gid) < 0) {
804 rsyserr(FLOG, errno, "initgroups failed");
805 io_printf(f_out, "@ERROR: initgroups failed\n");
817 rsyserr(FLOG, errno, "setuid %ld failed", (long)uid);
818 io_printf(f_out, "@ERROR: setuid failed\n");
822 am_root = (MY_UID() == 0);
825 if (lp_temp_dir(i) && *lp_temp_dir(i)) {
826 tmpdir = lp_temp_dir(i);
827 if (strlen(tmpdir) >= MAXPATHLEN - 10) {
829 "the 'temp dir' value for %s is WAY too long -- ignoring.\n",
835 io_printf(f_out, "@RSYNCD: OK\n");
837 read_args(f_in, name, line, sizeof line, rl_nulls, &argv, &argc, &request);
840 save_munge_symlinks = munge_symlinks;
842 reset_output_levels(); /* future verbosity is controlled by client options */
843 ret = parse_arguments(&argc, (const char ***) &argv);
844 if (protect_args && ret) {
845 orig_early_argv = orig_argv;
847 read_args(f_in, name, line, sizeof line, 1, &argv, &argc, &request);
849 ret = parse_arguments(&argc, (const char ***) &argv);
851 orig_early_argv = NULL;
853 munge_symlinks = save_munge_symlinks; /* The client mustn't control this. */
856 err_msg = finish_pre_exec(pre_exec_pid, pre_exec_fd, request,
857 orig_early_argv, orig_argv);
861 free(orig_early_argv);
863 am_server = 1; /* Don't let someone try to be tricky. */
865 if (lp_ignore_errors(module_id))
870 if (lp_fake_super(i)) {
871 if (preserve_xattrs > 1)
874 } else if (am_root < 0) /* Treat --fake-super from client as --super. */
877 if (filesfrom_fd == 0)
882 rprintf(FLOG, "rsync %s %s from %s@%s (%s)\n",
883 am_sender ? "on" : "to",
884 request, auth_user, host, addr);
886 rprintf(FLOG, "rsync %s %s from %s (%s)\n",
887 am_sender ? "on" : "to",
888 request, host, addr);
894 /* don't allow the logs to be flooded too fast */
895 limit_output_verbosity(lp_max_verbosity(i));
898 if (protocol_version < 23
899 && (protocol_version == 22 || am_sender))
900 io_start_multiplex_out(f_out);
901 else if (!ret || err_msg) {
902 /* We have to get I/O multiplexing started so that we can
903 * get the error back to the client. This means getting
904 * the protocol setup finished first in later versions. */
905 setup_protocol(f_out, f_in);
907 /* Since we failed in our option parsing, we may not
908 * have finished parsing that the client sent us a
909 * --files-from option, so look for it manually.
910 * Without this, the socket would be in the wrong
911 * state for the upcoming error message. */
914 for (i = 0; i < argc; i++) {
915 if (strncmp(argv[i], "--files-from", 12) == 0) {
922 write_byte(f_out, 0);
924 io_start_multiplex_out(f_out);
927 if (!ret || err_msg) {
929 rwrite(FERROR, err_msg, strlen(err_msg), 0);
933 exit_cleanup(RERR_UNSUPPORTED);
938 if (ic_send != (iconv_t)-1) {
939 iconv_close(ic_send);
940 ic_send = (iconv_t)-1;
942 if (ic_recv != (iconv_t)-1) {
943 iconv_close(ic_recv);
944 ic_recv = (iconv_t)-1;
950 && (use_chroot ? lp_numeric_ids(i) != False : lp_numeric_ids(i) == True))
951 numeric_ids = -1; /* Set --numeric-ids w/o breaking protocol. */
953 if (lp_timeout(i) && (!io_timeout || lp_timeout(i) < io_timeout))
954 set_io_timeout(lp_timeout(i));
956 /* If we have some incoming/outgoing chmod changes, append them to
957 * any user-specified changes (making our changes have priority).
958 * We also get a pointer to just our changes so that a receiver
959 * process can use them separately if --perms wasn't specified. */
961 p = lp_outgoing_chmod(i);
963 p = lp_incoming_chmod(i);
964 if (*p && !(daemon_chmod_modes = parse_chmod(p, &chmod_modes))) {
965 rprintf(FLOG, "Invalid \"%sing chmod\" directive: %s\n",
966 am_sender ? "outgo" : "incom", p);
969 start_server(f_in, f_out, argc, argv);
974 /* send a list of available modules to the client. Don't list those
975 with "list = False". */
976 static void send_listing(int fd)
978 int n = lp_num_modules();
981 for (i = 0; i < n; i++) {
983 io_printf(fd, "%-15s\t%s\n", lp_name(i), lp_comment(i));
986 if (protocol_version >= 25)
987 io_printf(fd,"@RSYNCD: EXIT\n");
990 static int load_config(int globals_only)
993 if (am_server && am_root <= 0)
994 config_file = RSYNCD_USERCONF;
996 config_file = RSYNCD_SYSCONF;
998 return lp_load(config_file, globals_only);
1001 /* this is called when a connection is established to a client
1002 and we want to start talking. The setup of the system is done from
1004 int start_daemon(int f_in, int f_out)
1007 const char *addr, *host;
1010 io_set_sock_fds(f_in, f_out);
1012 /* We must load the config file before calling any function that
1013 * might cause log-file output to occur. This ensures that the
1014 * "log file" param gets honored for the 2 non-forked use-cases
1015 * (when rsync is run by init and run by a remote shell). */
1016 if (!load_config(0))
1017 exit_cleanup(RERR_SYNTAX);
1019 addr = client_addr(f_in);
1020 host = lp_reverse_lookup(-1) ? client_name(f_in) : undetermined_hostname;
1021 rprintf(FLOG, "connect from %s (%s)\n", host, addr);
1024 set_socket_options(f_in, "SO_KEEPALIVE");
1025 set_nonblocking(f_in);
1028 if (exchange_protocols(f_in, f_out, line, sizeof line, 0) < 0)
1032 if (!read_line_old(f_in, line, sizeof line))
1035 if (!*line || strcmp(line, "#list") == 0) {
1036 rprintf(FLOG, "module-list request from %s (%s)\n",
1038 send_listing(f_out);
1043 /* it's some sort of command that I don't understand */
1044 io_printf(f_out, "@ERROR: Unknown command '%s'\n", line);
1048 if ((i = lp_number(line)) < 0) {
1049 rprintf(FLOG, "unknown module '%s' tried from %s (%s)\n",
1051 io_printf(f_out, "@ERROR: Unknown module '%s'\n", line);
1055 #ifdef HAVE_SIGACTION
1056 sigact.sa_flags = SA_NOCLDSTOP;
1058 SIGACTION(SIGCHLD, remember_children);
1060 return rsync_module(f_in, f_out, i, addr, host);
1063 static void create_pid_file(void)
1065 char *pid_file = lp_pid_file();
1067 pid_t pid = getpid();
1070 if (!pid_file || !*pid_file)
1073 cleanup_set_pid(pid);
1074 if ((fd = do_open(pid_file, O_WRONLY|O_CREAT|O_EXCL, 0666 & ~orig_umask)) == -1) {
1077 fprintf(stderr, "failed to create pid file %s: %s\n", pid_file, strerror(errno));
1078 rsyserr(FLOG, errno, "failed to create pid file %s", pid_file);
1079 exit_cleanup(RERR_FILEIO);
1081 snprintf(pidbuf, sizeof pidbuf, "%ld\n", (long)pid);
1082 len = strlen(pidbuf);
1083 if (write(fd, pidbuf, len) != len)
1088 /* Become a daemon, discarding the controlling terminal. */
1089 static void become_daemon(void)
1096 fprintf(stderr, "failed to fork: %s\n", strerror(errno));
1097 exit_cleanup(RERR_FILEIO);
1104 /* detach from the terminal */
1107 #elif defined TIOCNOTTY
1108 i = open("/dev/tty", O_RDWR);
1110 ioctl(i, (int)TIOCNOTTY, (char *)0);
1114 /* make sure that stdin, stdout an stderr don't stuff things
1115 * up (library functions, for example) */
1116 for (i = 0; i < 3; i++) {
1118 open("/dev/null", O_RDWR);
1122 int daemon_main(void)
1124 if (is_a_socket(STDIN_FILENO)) {
1127 /* we are running via inetd - close off stdout and
1128 * stderr so that library functions (and getopt) don't
1129 * try to use them. Redirect them to /dev/null */
1130 for (i = 1; i < 3; i++) {
1132 open("/dev/null", O_RDWR);
1135 return start_daemon(STDIN_FILENO, STDIN_FILENO);
1138 if (!load_config(1)) {
1139 fprintf(stderr, "Failed to parse config file: %s\n", config_file);
1140 exit_cleanup(RERR_SYNTAX);
1149 if (rsync_port == 0 && (rsync_port = lp_rsync_port()) == 0)
1150 rsync_port = RSYNC_PORT;
1151 if (bind_address == NULL && *lp_bind_address())
1152 bind_address = lp_bind_address();
1156 rprintf(FLOG, "rsyncd version %s starting, listening on port %d\n",
1157 RSYNC_VERSION, rsync_port);
1158 /* TODO: If listening on a particular address, then show that
1159 * address too. In fact, why not just do inet_ntop on the
1160 * local address??? */
1162 start_accept_loop(rsync_port, start_daemon);