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) 2002-2015 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 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 filter_rule_list daemon_filter_list;
59 extern char *iconv_opt;
60 extern iconv_t ic_send, ic_recv;
66 struct chmod_mode_struct *daemon_chmod_modes;
68 /* module_dirlen is the length of the module_dir string when in daemon
69 * mode and module_dir is not "/"; otherwise 0. (Note that a chroot-
70 * enabled module can have a non-"/" module_dir these days.) */
71 char *module_dir = NULL;
72 unsigned int module_dirlen = 0;
74 char *full_module_path;
76 static int rl_nulls = 0;
79 static struct sigaction sigact;
82 static item_list gid_list = EMPTY_ITEM_LIST;
84 /* Used when "reverse lookup" is off. */
85 const char undetermined_hostname[] = "UNDETERMINED";
88 * Run a client connected to an rsyncd. The alternative to this
89 * function for remote-shell connections is do_cmd().
91 * After negotiating which module to use and reading the server's
92 * motd, this hands over to client_run(). Telling the server the
93 * module will cause it to chroot/setuid/etc.
95 * Instead of doing a transfer, the client may at this stage instead
96 * get a listing of remote modules and exit.
98 * @return -1 for error in startup, or the result of client_run().
99 * Either way, it eventually gets passed to exit_cleanup().
101 int start_socket_client(char *host, int remote_argc, char *remote_argv[],
102 int argc, char *argv[])
105 char *p, *user = NULL;
107 /* This is redundant with code in start_inband_exchange(), but this
108 * short-circuits a problem in the client before we open a socket,
109 * and the extra check won't hurt. */
110 if (**remote_argv == '/') {
112 "ERROR: The remote path must start with a module name not a /\n");
116 if ((p = strrchr(host, '@')) != NULL) {
122 fd = open_socket_out_wrapped(host, rsync_port, bind_address,
125 exit_cleanup(RERR_SOCKETIO);
131 ret = start_inband_exchange(fd, fd, user, remote_argc, remote_argv);
133 return ret ? ret : client_run(fd, fd, -1, argc, argv);
136 static int exchange_protocols(int f_in, int f_out, char *buf, size_t bufsiz, int am_client)
139 #if SUBPROTOCOL_VERSION != 0
140 int our_sub = protocol_version < PROTOCOL_VERSION ? 0 : SUBPROTOCOL_VERSION;
146 io_printf(f_out, "@RSYNCD: %d.%d\n", protocol_version, our_sub);
149 motd = lp_motd_file();
151 FILE *f = fopen(motd,"r");
152 while (f && !feof(f)) {
153 int len = fread(buf, 1, bufsiz - 1, f);
155 write_buf(f_out, buf, len);
159 write_sbuf(f_out, "\n");
163 /* This strips the \n. */
164 if (!read_line_old(f_in, buf, bufsiz, 0)) {
166 rprintf(FERROR, "rsync: did not see server greeting\n");
170 if (sscanf(buf, "@RSYNCD: %d.%d", &remote_protocol, &remote_sub) < 1) {
172 rprintf(FERROR, "rsync: server sent \"%s\" rather than greeting\n", buf);
174 io_printf(f_out, "@ERROR: protocol startup error\n");
178 if (remote_sub < 0) {
179 if (remote_protocol == 30) {
181 rprintf(FERROR, "rsync: server is speaking an incompatible beta of protocol 30\n");
183 io_printf(f_out, "@ERROR: your client is speaking an incompatible beta of protocol 30\n");
189 if (protocol_version > remote_protocol) {
190 protocol_version = remote_protocol;
193 } else if (protocol_version == remote_protocol) {
194 if (remote_sub != our_sub)
197 #if SUBPROTOCOL_VERSION != 0
198 else if (protocol_version < remote_protocol) {
204 if (protocol_version >= 30)
210 int start_inband_exchange(int f_in, int f_out, const char *user, int argc, char *argv[])
213 char line[BIGPATHBUFLEN];
214 char *sargs[MAX_ARGS];
218 assert(argc > 0 && *argv != NULL);
222 "ERROR: The remote path must start with a module name\n");
226 if (!(p = strchr(*argv, '/')))
227 modlen = strlen(*argv);
231 if (!(modname = new_array(char, modlen+1+1))) /* room for '/' & '\0' */
232 out_of_memory("start_inband_exchange");
233 strlcpy(modname, *argv, modlen + 1);
234 modname[modlen] = '/';
235 modname[modlen+1] = '\0';
238 user = getenv("USER");
240 user = getenv("LOGNAME");
242 if (exchange_protocols(f_in, f_out, line, sizeof line, 1) < 0)
245 /* set daemon_over_rsh to false since we need to build the
246 * true set of args passed through the rsh/ssh connection;
247 * this is a no-op for direct-socket-connection mode */
249 server_options(sargs, &sargc);
251 if (sargc >= MAX_ARGS - 2)
254 sargs[sargc++] = ".";
257 if (sargc >= MAX_ARGS - 1) {
259 rprintf(FERROR, "internal: args[] overflowed in do_cmd()\n");
260 exit_cleanup(RERR_SYNTAX);
262 if (strncmp(*argv, modname, modlen) == 0
263 && argv[0][modlen] == '\0')
264 sargs[sargc++] = modname; /* we send "modname/" */
265 else if (**argv == '-') {
266 if (asprintf(sargs + sargc++, "./%s", *argv) < 0)
267 out_of_memory("start_inband_exchange");
269 sargs[sargc++] = *argv;
276 if (DEBUG_GTE(CMD, 1))
277 print_child_argv("sending daemon args:", sargs);
279 io_printf(f_out, "%.*s\n", modlen, modname);
281 /* Old servers may just drop the connection here,
282 rather than sending a proper EXIT command. Yuck. */
283 kluge_around_eof = list_only && protocol_version < 25 ? 1 : 0;
286 if (!read_line_old(f_in, line, sizeof line, 0)) {
287 rprintf(FERROR, "rsync: didn't get server startup line\n");
291 if (strncmp(line,"@RSYNCD: AUTHREQD ",18) == 0) {
292 auth_client(f_out, user, line+18);
296 if (strcmp(line,"@RSYNCD: OK") == 0)
299 if (strcmp(line,"@RSYNCD: EXIT") == 0) {
300 /* This is sent by recent versions of the
301 * server to terminate the listing of modules.
302 * We don't want to go on and transfer
303 * anything; just exit. */
307 if (strncmp(line, "@ERROR", 6) == 0) {
308 rprintf(FERROR, "%s\n", line);
309 /* This is always fatal; the server will now
310 * close the socket. */
314 /* This might be a MOTD line or a module listing, but there is
315 * no way to differentiate it. The manpage mentions this. */
317 rprintf(FINFO, "%s\n", line);
319 kluge_around_eof = 0;
322 for (i = 0; i < sargc; i++) {
323 if (!sargs[i]) /* stop at --protect-args NULL */
325 write_sbuf(f_out, sargs[i]);
326 write_byte(f_out, 0);
328 write_byte(f_out, 0);
330 for (i = 0; i < sargc; i++)
331 io_printf(f_out, "%s\n", sargs[i]);
332 write_sbuf(f_out, "\n");
336 send_protected_args(f_out, sargs);
338 if (protocol_version < 23) {
339 if (protocol_version == 22 || !am_sender)
340 io_start_multiplex_in(f_in);
348 static char *finish_pre_exec(pid_t pid, int write_fd, int read_fd, char *request,
349 char **early_argv, char **argv)
351 char buf[BIGPATHBUFLEN], *bp;
352 int j = 0, status = -1, msglen = sizeof buf - 1;
357 write_buf(write_fd, request, strlen(request)+1);
359 for ( ; *early_argv; early_argv++)
360 write_buf(write_fd, *early_argv, strlen(*early_argv)+1);
361 j = 1; /* Skip arg0 name in argv. */
363 for ( ; argv[j]; j++)
364 write_buf(write_fd, argv[j], strlen(argv[j])+1);
365 write_byte(write_fd, 0);
369 /* Read the stdout from the pre-xfer exec program. This it is only
370 * displayed to the user if the script also returns an error status. */
371 for (bp = buf; msglen > 0; msglen -= j) {
372 if ((j = read(read_fd, bp, msglen)) <= 0) {
377 break; /* Just ignore the read error for now... */
380 if (j > 1 && bp[-1] == '\n' && bp[-2] == '\r') {
390 if (wait_process(pid, &status, 0) < 0
391 || !WIFEXITED(status) || WEXITSTATUS(status) != 0) {
393 if (asprintf(&e, "pre-xfer exec returned failure (%d)%s%s%s\n%s",
394 status, status < 0 ? ": " : "",
395 status < 0 ? strerror(errno) : "",
396 *buf ? ":" : "", buf) < 0)
397 return "out_of_memory in finish_pre_exec\n";
404 static int read_arg_from_pipe(int fd, char *buf, int limit)
406 char *bp = buf, *eob = buf + limit - 1;
409 int got = read(fd, bp, 1);
411 if (got < 0 && errno == EINTR)
426 static int path_failure(int f_out, const char *dir, BOOL was_chdir)
429 rsyserr(FLOG, errno, "chdir %s failed", dir);
431 rprintf(FLOG, "normalize_path(%s) failed\n", dir);
432 io_printf(f_out, "@ERROR: chdir failed\n");
436 static int add_a_group(int f_out, const char *gname)
439 if (!group_to_gid(gname, &gid, True)) {
440 rprintf(FLOG, "Invalid gid %s\n", gname);
441 io_printf(f_out, "@ERROR: invalid gid %s\n", gname);
444 gid_p = EXPAND_ITEM_LIST(&gid_list, gid_t, -32);
449 #ifdef HAVE_GETGROUPLIST
450 static int want_all_groups(int f_out, uid_t uid)
453 if ((err = getallgroups(uid, &gid_list)) != NULL) {
454 rsyserr(FLOG, errno, "%s", err);
455 io_printf(f_out, "@ERROR: %s\n", err);
460 #elif defined HAVE_INITGROUPS
461 static struct passwd *want_all_groups(int f_out, uid_t uid)
465 if ((pw = getpwuid(uid)) == NULL) {
466 rsyserr(FLOG, errno, "getpwuid failed");
467 io_printf(f_out, "@ERROR: getpwuid failed\n");
470 /* Start with the default group and initgroups() will add the rest. */
471 gid_p = EXPAND_ITEM_LIST(&gid_list, gid_t, -32);
477 static void set_env_str(const char *var, const char *str)
481 if (asprintf(&mem, "%s=%s", var, str) < 0)
482 out_of_memory("set_env_str");
488 static void set_env_num(const char *var, long num)
491 if (asprintf(&mem, "%s=%ld", var, num) < 0)
492 out_of_memory("set_env_num");
497 static int rsync_module(int f_in, int f_out, int i, const char *addr, const char *host)
500 char **argv, **orig_argv, **orig_early_argv, *module_chdir;
501 char line[BIGPATHBUFLEN];
502 #if defined HAVE_INITGROUPS && !defined HAVE_GETGROUPLIST
503 struct passwd *pw = NULL;
507 char *p, *err_msg = NULL;
508 char *name = lp_name(i);
509 int use_chroot = lp_use_chroot(i);
510 int ret, pre_exec_arg_fd = -1, pre_exec_error_fd = -1;
511 int save_munge_symlinks;
512 pid_t pre_exec_pid = 0;
513 char *request = NULL;
515 set_env_str("RSYNC_MODULE_NAME", name);
518 iconv_opt = lp_charset(i);
524 /* If reverse lookup is disabled globally but enabled for this module,
525 * we need to do it now before the access check. */
526 if (host == undetermined_hostname && lp_reverse_lookup(i))
527 host = client_name(f_in);
528 set_env_str("RSYNC_HOST_NAME", host);
529 set_env_str("RSYNC_HOST_ADDR", addr);
531 if (!allow_access(addr, &host, i)) {
532 rprintf(FLOG, "rsync denied on module %s from %s (%s)\n",
535 io_printf(f_out, "@ERROR: Unknown module '%s'\n", name);
538 "@ERROR: access denied to %s from %s (%s)\n",
544 if (am_daemon && am_server) {
545 rprintf(FLOG, "rsync allowed access on module %s from %s (%s)\n",
549 if (!claim_connection(lp_lock_file(i), lp_max_connections(i))) {
551 rsyserr(FLOG, errno, "failed to open lock file %s",
553 io_printf(f_out, "@ERROR: failed to open lock file\n");
555 rprintf(FLOG, "max connections (%d) reached\n",
556 lp_max_connections(i));
557 io_printf(f_out, "@ERROR: max connections (%d) reached -- try again later\n",
558 lp_max_connections(i));
563 read_only = lp_read_only(i); /* may also be overridden by auth_server() */
564 auth_user = auth_server(f_in, f_out, i, host, addr, "@RSYNCD: AUTHREQD ");
567 io_printf(f_out, "@ERROR: auth failed on module %s\n", name);
570 set_env_str("RSYNC_USER_NAME", auth_user);
574 if (lp_transfer_logging(i) && !logfile_format)
575 logfile_format = lp_log_format(i);
576 if (log_format_has(logfile_format, 'i'))
577 logfile_format_has_i = 1;
578 if (logfile_format_has_i || log_format_has(logfile_format, 'o'))
579 logfile_format_has_o_or_i = 1;
582 am_root = (uid == 0);
584 p = *lp_uid(i) ? lp_uid(i) : am_root ? NOBODY_USER : NULL;
586 if (!user_to_uid(p, &uid, True)) {
587 rprintf(FLOG, "Invalid uid %s\n", p);
588 io_printf(f_out, "@ERROR: invalid uid %s\n", p);
595 p = *lp_gid(i) ? conf_strtok(lp_gid(i)) : NULL;
597 /* The "*" gid must be the first item in the list. */
598 if (strcmp(p, "*") == 0) {
599 #ifdef HAVE_GETGROUPLIST
600 if (want_all_groups(f_out, uid) < 0)
602 #elif defined HAVE_INITGROUPS
603 if ((pw = want_all_groups(f_out, uid)) == NULL)
606 rprintf(FLOG, "This rsync does not support a gid of \"*\"\n");
607 io_printf(f_out, "@ERROR: invalid gid setting.\n");
610 } else if (add_a_group(f_out, p) < 0)
612 while ((p = conf_strtok(NULL)) != NULL) {
613 #if defined HAVE_INITGROUPS && !defined HAVE_GETGROUPLIST
615 rprintf(FLOG, "This rsync cannot add groups after \"*\".\n");
616 io_printf(f_out, "@ERROR: invalid gid setting.\n");
620 if (add_a_group(f_out, p) < 0)
623 } else if (am_root) {
624 if (add_a_group(f_out, NOBODY_GROUP) < 0)
628 module_dir = lp_path(i);
629 if (*module_dir == '\0') {
630 rprintf(FLOG, "No path specified for module %s\n", name);
631 io_printf(f_out, "@ERROR: no path setting.\n");
635 if ((p = strstr(module_dir, "/./")) != NULL) {
636 *p = '\0'; /* Temporary... */
637 if (!(module_chdir = normalize_path(module_dir, True, NULL)))
638 return path_failure(f_out, module_dir, False);
640 if (!(p = normalize_path(p + 2, True, &module_dirlen)))
641 return path_failure(f_out, strstr(module_dir, "/./"), False);
642 if (!(full_module_path = normalize_path(module_dir, False, NULL)))
643 full_module_path = module_dir;
646 if (!(module_chdir = normalize_path(module_dir, False, NULL)))
647 return path_failure(f_out, module_dir, False);
648 full_module_path = module_chdir;
653 if (!(module_chdir = normalize_path(module_dir, False, &module_dirlen)))
654 return path_failure(f_out, module_dir, False);
655 full_module_path = module_dir = module_chdir;
657 set_env_str("RSYNC_MODULE_PATH", full_module_path);
659 if (module_dirlen == 1) {
661 set_filter_dir("/", 1);
663 set_filter_dir(module_dir, module_dirlen);
666 parse_filter_str(&daemon_filter_list, p, rule_template(FILTRULE_WORD_SPLIT),
667 XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3);
669 p = lp_include_from(i);
670 parse_filter_file(&daemon_filter_list, p, rule_template(FILTRULE_INCLUDE),
671 XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3 | XFLG_OLD_PREFIXES | XFLG_FATAL_ERRORS);
674 parse_filter_str(&daemon_filter_list, p,
675 rule_template(FILTRULE_INCLUDE | FILTRULE_WORD_SPLIT),
676 XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3 | XFLG_OLD_PREFIXES);
678 p = lp_exclude_from(i);
679 parse_filter_file(&daemon_filter_list, p, rule_template(0),
680 XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3 | XFLG_OLD_PREFIXES | XFLG_FATAL_ERRORS);
683 parse_filter_str(&daemon_filter_list, p, rule_template(FILTRULE_WORD_SPLIT),
684 XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3 | XFLG_OLD_PREFIXES);
689 if (*lp_prexfer_exec(i) || *lp_postxfer_exec(i)) {
692 /* For post-xfer exec, fork a new process to run the rsync
693 * daemon while this process waits for the exit status and
694 * runs the indicated command at that point. */
695 if (*lp_postxfer_exec(i)) {
698 rsyserr(FLOG, errno, "fork failed");
699 io_printf(f_out, "@ERROR: fork failed\n");
706 set_env_num("RSYNC_PID", (long)pid);
707 if (wait_process(pid, &status, 0) < 0)
709 set_env_num("RSYNC_RAW_STATUS", status);
710 if (WIFEXITED(status))
711 status = WEXITSTATUS(status);
714 set_env_num("RSYNC_EXIT_STATUS", status);
715 if (system(lp_postxfer_exec(i)) < 0)
720 /* For pre-xfer exec, fork a child process to run the indicated
721 * command, though it first waits for the parent process to
722 * send us the user's request via a pipe. */
723 if (*lp_prexfer_exec(i)) {
724 int arg_fds[2], error_fds[2];
725 set_env_num("RSYNC_PID", (long)getpid());
726 if (pipe(arg_fds) < 0 || pipe(error_fds) < 0 || (pre_exec_pid = fork()) < 0) {
727 rsyserr(FLOG, errno, "pre-xfer exec preparation failed");
728 io_printf(f_out, "@ERROR: pre-xfer exec preparation failed\n");
731 if (pre_exec_pid == 0) {
732 char buf[BIGPATHBUFLEN];
736 pre_exec_arg_fd = arg_fds[0];
737 pre_exec_error_fd = error_fds[1];
738 set_blocking(pre_exec_arg_fd);
739 set_blocking(pre_exec_error_fd);
740 len = read_arg_from_pipe(pre_exec_arg_fd, buf, BIGPATHBUFLEN);
743 set_env_str("RSYNC_REQUEST", buf);
745 len = read_arg_from_pipe(pre_exec_arg_fd, buf,
752 if (asprintf(&p, "RSYNC_ARG%d=%s", j, buf) >= 0)
755 close(pre_exec_arg_fd);
757 dup2(pre_exec_error_fd, STDOUT_FILENO);
758 close(pre_exec_error_fd);
759 status = system(lp_prexfer_exec(i));
760 if (!WIFEXITED(status))
762 _exit(WEXITSTATUS(status));
766 pre_exec_arg_fd = arg_fds[1];
767 pre_exec_error_fd = error_fds[0];
768 set_blocking(pre_exec_arg_fd);
769 set_blocking(pre_exec_error_fd);
776 * XXX: The 'use chroot' flag is a fairly reliable
777 * source of confusion, because it fails under two
778 * important circumstances: running as non-root,
779 * running on Win32 (or possibly others). On the
780 * other hand, if you are running as root, then it
781 * might be better to always use chroot.
783 * So, perhaps if we can't chroot we should just issue
784 * a warning, unless a "require chroot" flag is set,
785 * in which case we fail.
787 if (chroot(module_chdir)) {
788 rsyserr(FLOG, errno, "chroot %s failed", module_chdir);
789 io_printf(f_out, "@ERROR: chroot failed\n");
792 module_chdir = module_dir;
795 if (!change_dir(module_chdir, CD_NORMAL))
796 return path_failure(f_out, module_chdir, True);
797 if (module_dirlen || (!use_chroot && !*lp_daemon_chroot()))
800 if ((munge_symlinks = lp_munge_symlinks(i)) < 0)
801 munge_symlinks = !use_chroot || module_dirlen;
802 if (munge_symlinks) {
804 char prefix[SYMLINK_PREFIX_LEN]; /* NOT +1 ! */
805 strlcpy(prefix, SYMLINK_PREFIX, sizeof prefix); /* trim the trailing slash */
806 if (do_stat(prefix, &st) == 0 && S_ISDIR(st.st_mode)) {
807 rprintf(FLOG, "Symlink munging is unsafe when a %s directory exists.\n",
809 io_printf(f_out, "@ERROR: daemon security issue -- contact admin\n", name);
810 exit_cleanup(RERR_UNSUPPORTED);
814 if (gid_list.count) {
815 gid_t *gid_array = gid_list.items;
816 if (setgid(gid_array[0])) {
817 rsyserr(FLOG, errno, "setgid %ld failed", (long)gid_array[0]);
818 io_printf(f_out, "@ERROR: setgid failed\n");
821 #ifdef HAVE_SETGROUPS
822 /* Set the group(s) we want to be active. */
823 if (setgroups(gid_list.count, gid_array)) {
824 rsyserr(FLOG, errno, "setgroups failed");
825 io_printf(f_out, "@ERROR: setgroups failed\n");
829 #if defined HAVE_INITGROUPS && !defined HAVE_GETGROUPLIST
830 /* pw is set if the user wants all the user's groups. */
831 if (pw && initgroups(pw->pw_name, pw->pw_gid) < 0) {
832 rsyserr(FLOG, errno, "initgroups failed");
833 io_printf(f_out, "@ERROR: initgroups failed\n");
845 rsyserr(FLOG, errno, "setuid %ld failed", (long)uid);
846 io_printf(f_out, "@ERROR: setuid failed\n");
850 am_root = (MY_UID() == 0);
853 if (lp_temp_dir(i) && *lp_temp_dir(i)) {
854 tmpdir = lp_temp_dir(i);
855 if (strlen(tmpdir) >= MAXPATHLEN - 10) {
857 "the 'temp dir' value for %s is WAY too long -- ignoring.\n",
863 io_printf(f_out, "@RSYNCD: OK\n");
865 read_args(f_in, name, line, sizeof line, rl_nulls, &argv, &argc, &request);
868 save_munge_symlinks = munge_symlinks;
870 reset_output_levels(); /* future verbosity is controlled by client options */
871 ret = parse_arguments(&argc, (const char ***) &argv);
872 if (protect_args && ret) {
873 orig_early_argv = orig_argv;
875 read_args(f_in, name, line, sizeof line, 1, &argv, &argc, &request);
877 ret = parse_arguments(&argc, (const char ***) &argv);
879 orig_early_argv = NULL;
881 munge_symlinks = save_munge_symlinks; /* The client mustn't control this. */
884 err_msg = finish_pre_exec(pre_exec_pid, pre_exec_arg_fd, pre_exec_error_fd,
885 request, orig_early_argv, orig_argv);
889 free(orig_early_argv);
891 am_server = 1; /* Don't let someone try to be tricky. */
893 if (lp_ignore_errors(module_id))
898 if (lp_fake_super(i)) {
899 if (preserve_xattrs > 1)
902 } else if (am_root < 0) /* Treat --fake-super from client as --super. */
905 if (filesfrom_fd == 0)
910 rprintf(FLOG, "rsync %s %s from %s@%s (%s)\n",
911 am_sender ? "on" : "to",
912 request, auth_user, host, addr);
914 rprintf(FLOG, "rsync %s %s from %s (%s)\n",
915 am_sender ? "on" : "to",
916 request, host, addr);
922 /* don't allow the logs to be flooded too fast */
923 limit_output_verbosity(lp_max_verbosity(i));
926 if (protocol_version < 23
927 && (protocol_version == 22 || am_sender))
928 io_start_multiplex_out(f_out);
929 else if (!ret || err_msg) {
930 /* We have to get I/O multiplexing started so that we can
931 * get the error back to the client. This means getting
932 * the protocol setup finished first in later versions. */
933 setup_protocol(f_out, f_in);
935 /* Since we failed in our option parsing, we may not
936 * have finished parsing that the client sent us a
937 * --files-from option, so look for it manually.
938 * Without this, the socket would be in the wrong
939 * state for the upcoming error message. */
942 for (i = 0; i < argc; i++) {
943 if (strncmp(argv[i], "--files-from", 12) == 0) {
950 write_byte(f_out, 0);
952 io_start_multiplex_out(f_out);
955 if (!ret || err_msg) {
957 while ((p = strchr(err_msg, '\n')) != NULL) {
958 int len = p - err_msg + 1;
959 rwrite(FERROR, err_msg, len, 0);
963 rprintf(FERROR, "%s\n", err_msg);
967 exit_cleanup(RERR_UNSUPPORTED);
972 if (ic_send != (iconv_t)-1) {
973 iconv_close(ic_send);
974 ic_send = (iconv_t)-1;
976 if (ic_recv != (iconv_t)-1) {
977 iconv_close(ic_recv);
978 ic_recv = (iconv_t)-1;
984 && (use_chroot ? lp_numeric_ids(i) != False : lp_numeric_ids(i) == True))
985 numeric_ids = -1; /* Set --numeric-ids w/o breaking protocol. */
987 if (lp_timeout(i) && (!io_timeout || lp_timeout(i) < io_timeout))
988 set_io_timeout(lp_timeout(i));
990 /* If we have some incoming/outgoing chmod changes, append them to
991 * any user-specified changes (making our changes have priority).
992 * We also get a pointer to just our changes so that a receiver
993 * process can use them separately if --perms wasn't specified. */
995 p = lp_outgoing_chmod(i);
997 p = lp_incoming_chmod(i);
998 if (*p && !(daemon_chmod_modes = parse_chmod(p, &chmod_modes))) {
999 rprintf(FLOG, "Invalid \"%sing chmod\" directive: %s\n",
1000 am_sender ? "outgo" : "incom", p);
1003 start_server(f_in, f_out, argc, argv);
1008 /* send a list of available modules to the client. Don't list those
1009 with "list = False". */
1010 static void send_listing(int fd)
1012 int n = lp_num_modules();
1015 for (i = 0; i < n; i++) {
1017 io_printf(fd, "%-15s\t%s\n", lp_name(i), lp_comment(i));
1020 if (protocol_version >= 25)
1021 io_printf(fd,"@RSYNCD: EXIT\n");
1024 static int load_config(int globals_only)
1027 if (am_server && am_root <= 0)
1028 config_file = RSYNCD_USERCONF;
1030 config_file = RSYNCD_SYSCONF;
1032 return lp_load(config_file, globals_only);
1035 /* this is called when a connection is established to a client
1036 and we want to start talking. The setup of the system is done from
1038 int start_daemon(int f_in, int f_out)
1041 const char *addr, *host;
1045 io_set_sock_fds(f_in, f_out);
1047 /* We must load the config file before calling any function that
1048 * might cause log-file output to occur. This ensures that the
1049 * "log file" param gets honored for the 2 non-forked use-cases
1050 * (when rsync is run by init and run by a remote shell). */
1051 if (!load_config(0))
1052 exit_cleanup(RERR_SYNTAX);
1054 p = lp_daemon_chroot();
1056 log_init(0); /* Make use we've initialized syslog before chrooting. */
1057 if (chroot(p) < 0 || chdir("/") < 0) {
1058 rsyserr(FLOG, errno, "daemon chroot %s failed", p);
1062 p = lp_daemon_gid();
1065 if (!group_to_gid(p, &gid, True)) {
1066 rprintf(FLOG, "Invalid daemon gid: %s\n", p);
1069 if (setgid(gid) < 0) {
1070 rsyserr(FLOG, errno, "Unable to set group to daemon gid %ld", (long)gid);
1074 p = lp_daemon_uid();
1077 if (!user_to_uid(p, &uid, True)) {
1078 rprintf(FLOG, "Invalid daemon uid: %s\n", p);
1081 if (setuid(uid) < 0) {
1082 rsyserr(FLOG, errno, "Unable to set user to daemon uid %ld", (long)uid);
1087 addr = client_addr(f_in);
1088 host = lp_reverse_lookup(-1) ? client_name(f_in) : undetermined_hostname;
1089 rprintf(FLOG, "connect from %s (%s)\n", host, addr);
1092 set_socket_options(f_in, "SO_KEEPALIVE");
1093 set_nonblocking(f_in);
1096 if (exchange_protocols(f_in, f_out, line, sizeof line, 0) < 0)
1100 if (!read_line_old(f_in, line, sizeof line, 0))
1103 if (!*line || strcmp(line, "#list") == 0) {
1104 rprintf(FLOG, "module-list request from %s (%s)\n",
1106 send_listing(f_out);
1111 /* it's some sort of command that I don't understand */
1112 io_printf(f_out, "@ERROR: Unknown command '%s'\n", line);
1116 if ((i = lp_number(line)) < 0) {
1117 rprintf(FLOG, "unknown module '%s' tried from %s (%s)\n",
1119 io_printf(f_out, "@ERROR: Unknown module '%s'\n", line);
1123 #ifdef HAVE_SIGACTION
1124 sigact.sa_flags = SA_NOCLDSTOP;
1126 SIGACTION(SIGCHLD, remember_children);
1128 return rsync_module(f_in, f_out, i, addr, host);
1131 static void create_pid_file(void)
1133 char *pid_file = lp_pid_file();
1135 pid_t pid = getpid();
1138 if (!pid_file || !*pid_file)
1141 cleanup_set_pid(pid);
1142 if ((fd = do_open(pid_file, O_WRONLY|O_CREAT|O_EXCL, 0666)) == -1) {
1145 fprintf(stderr, "failed to create pid file %s: %s\n", pid_file, strerror(errno));
1146 rsyserr(FLOG, errno, "failed to create pid file %s", pid_file);
1147 exit_cleanup(RERR_FILEIO);
1149 snprintf(pidbuf, sizeof pidbuf, "%d\n", (int)pid);
1150 len = strlen(pidbuf);
1151 if (write(fd, pidbuf, len) != len)
1156 /* Become a daemon, discarding the controlling terminal. */
1157 static void become_daemon(void)
1164 fprintf(stderr, "failed to fork: %s\n", strerror(errno));
1165 exit_cleanup(RERR_FILEIO);
1172 /* detach from the terminal */
1175 #elif defined TIOCNOTTY
1176 i = open("/dev/tty", O_RDWR);
1178 ioctl(i, (int)TIOCNOTTY, (char *)0);
1182 /* make sure that stdin, stdout an stderr don't stuff things
1183 * up (library functions, for example) */
1184 for (i = 0; i < 3; i++) {
1186 open("/dev/null", O_RDWR);
1190 int daemon_main(void)
1192 if (is_a_socket(STDIN_FILENO)) {
1195 /* we are running via inetd - close off stdout and
1196 * stderr so that library functions (and getopt) don't
1197 * try to use them. Redirect them to /dev/null */
1198 for (i = 1; i < 3; i++) {
1200 open("/dev/null", O_RDWR);
1203 return start_daemon(STDIN_FILENO, STDIN_FILENO);
1206 if (!load_config(1)) {
1207 fprintf(stderr, "Failed to parse config file: %s\n", config_file);
1208 exit_cleanup(RERR_SYNTAX);
1217 if (rsync_port == 0 && (rsync_port = lp_rsync_port()) == 0)
1218 rsync_port = RSYNC_PORT;
1219 if (bind_address == NULL && *lp_bind_address())
1220 bind_address = lp_bind_address();
1224 rprintf(FLOG, "rsyncd version %s starting, listening on port %d\n",
1225 RSYNC_VERSION, rsync_port);
1226 /* TODO: If listening on a particular address, then show that
1227 * address too. In fact, why not just do getnameinfo on the
1228 * local address??? */
1230 start_accept_loop(rsync_port, start_daemon);