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) 2002-2019 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;
68 struct chmod_mode_struct *daemon_chmod_modes;
70 /* module_dirlen is the length of the module_dir string when in daemon
71 * mode and module_dir is not "/"; otherwise 0. (Note that a chroot-
72 * enabled module can have a non-"/" module_dir these days.) */
73 char *module_dir = NULL;
74 unsigned int module_dirlen = 0;
76 char *full_module_path;
78 static int rl_nulls = 0;
81 static struct sigaction sigact;
84 static item_list gid_list = EMPTY_ITEM_LIST;
86 /* Used when "reverse lookup" is off. */
87 const char undetermined_hostname[] = "UNDETERMINED";
90 * Run a client connected to an rsyncd. The alternative to this
91 * function for remote-shell connections is do_cmd().
93 * After negotiating which module to use and reading the server's
94 * motd, this hands over to client_run(). Telling the server the
95 * module will cause it to chroot/setuid/etc.
97 * Instead of doing a transfer, the client may at this stage instead
98 * get a listing of remote modules and exit.
100 * @return -1 for error in startup, or the result of client_run().
101 * Either way, it eventually gets passed to exit_cleanup().
103 int start_socket_client(char *host, int remote_argc, char *remote_argv[],
104 int argc, char *argv[])
107 char *p, *user = NULL;
109 /* This is redundant with code in start_inband_exchange(), but this
110 * short-circuits a problem in the client before we open a socket,
111 * and the extra check won't hurt. */
112 if (**remote_argv == '/') {
114 "ERROR: The remote path must start with a module name not a /\n");
118 if ((p = strrchr(host, '@')) != NULL) {
124 fd = open_socket_out_wrapped(host, rsync_port, bind_address,
127 exit_cleanup(RERR_SOCKETIO);
133 ret = start_inband_exchange(fd, fd, user, remote_argc, remote_argv);
135 return ret ? ret : client_run(fd, fd, -1, argc, argv);
138 static int exchange_protocols(int f_in, int f_out, char *buf, size_t bufsiz, int am_client)
141 #if SUBPROTOCOL_VERSION != 0
142 int our_sub = protocol_version < PROTOCOL_VERSION ? 0 : SUBPROTOCOL_VERSION;
148 io_printf(f_out, "@RSYNCD: %d.%d\n", protocol_version, our_sub);
151 motd = lp_motd_file();
153 FILE *f = fopen(motd,"r");
154 while (f && !feof(f)) {
155 int len = fread(buf, 1, bufsiz - 1, f);
157 write_buf(f_out, buf, len);
161 write_sbuf(f_out, "\n");
165 /* This strips the \n. */
166 if (!read_line_old(f_in, buf, bufsiz, 0)) {
168 rprintf(FERROR, "rsync: did not see server greeting\n");
172 if (sscanf(buf, "@RSYNCD: %d.%d", &remote_protocol, &remote_sub) < 1) {
174 rprintf(FERROR, "rsync: server sent \"%s\" rather than greeting\n", buf);
176 io_printf(f_out, "@ERROR: protocol startup error\n");
180 if (remote_sub < 0) {
181 if (remote_protocol == 30) {
183 rprintf(FERROR, "rsync: server is speaking an incompatible beta of protocol 30\n");
185 io_printf(f_out, "@ERROR: your client is speaking an incompatible beta of protocol 30\n");
191 if (protocol_version > remote_protocol) {
192 protocol_version = remote_protocol;
195 } else if (protocol_version == remote_protocol) {
196 if (remote_sub != our_sub)
199 #if SUBPROTOCOL_VERSION != 0
200 else if (protocol_version < remote_protocol) {
206 if (protocol_version >= 30)
212 int start_inband_exchange(int f_in, int f_out, const char *user, int argc, char *argv[])
215 char line[BIGPATHBUFLEN];
216 char *sargs[MAX_ARGS];
220 assert(argc > 0 && *argv != NULL);
224 "ERROR: The remote path must start with a module name\n");
228 if (!(p = strchr(*argv, '/')))
229 modlen = strlen(*argv);
233 if (!(modname = new_array(char, modlen+1+1))) /* room for '/' & '\0' */
234 out_of_memory("start_inband_exchange");
235 strlcpy(modname, *argv, modlen + 1);
236 modname[modlen] = '/';
237 modname[modlen+1] = '\0';
240 user = getenv("USER");
242 user = getenv("LOGNAME");
244 if (exchange_protocols(f_in, f_out, line, sizeof line, 1) < 0)
247 /* set daemon_over_rsh to false since we need to build the
248 * true set of args passed through the rsh/ssh connection;
249 * this is a no-op for direct-socket-connection mode */
251 server_options(sargs, &sargc);
253 if (sargc >= MAX_ARGS - 2)
256 sargs[sargc++] = ".";
259 if (sargc >= MAX_ARGS - 1) {
261 rprintf(FERROR, "internal: args[] overflowed in do_cmd()\n");
262 exit_cleanup(RERR_SYNTAX);
264 if (strncmp(*argv, modname, modlen) == 0
265 && argv[0][modlen] == '\0')
266 sargs[sargc++] = modname; /* we send "modname/" */
267 else if (**argv == '-') {
268 if (asprintf(sargs + sargc++, "./%s", *argv) < 0)
269 out_of_memory("start_inband_exchange");
271 sargs[sargc++] = *argv;
278 if (DEBUG_GTE(CMD, 1))
279 print_child_argv("sending daemon args:", sargs);
281 io_printf(f_out, "%.*s\n", modlen, modname);
283 /* Old servers may just drop the connection here,
284 rather than sending a proper EXIT command. Yuck. */
285 kluge_around_eof = list_only && protocol_version < 25 ? 1 : 0;
288 if (!read_line_old(f_in, line, sizeof line, 0)) {
289 rprintf(FERROR, "rsync: didn't get server startup line\n");
293 if (strncmp(line,"@RSYNCD: AUTHREQD ",18) == 0) {
294 auth_client(f_out, user, line+18);
298 if (strcmp(line,"@RSYNCD: OK") == 0)
301 if (strcmp(line,"@RSYNCD: EXIT") == 0) {
302 /* This is sent by recent versions of the
303 * server to terminate the listing of modules.
304 * We don't want to go on and transfer
305 * anything; just exit. */
309 if (strncmp(line, "@ERROR", 6) == 0) {
310 rprintf(FERROR, "%s\n", line);
311 /* This is always fatal; the server will now
312 * close the socket. */
316 /* This might be a MOTD line or a module listing, but there is
317 * no way to differentiate it. The manpage mentions this. */
319 rprintf(FINFO, "%s\n", line);
321 kluge_around_eof = 0;
324 for (i = 0; i < sargc; i++) {
325 if (!sargs[i]) /* stop at --protect-args NULL */
327 write_sbuf(f_out, sargs[i]);
328 write_byte(f_out, 0);
330 write_byte(f_out, 0);
332 for (i = 0; i < sargc; i++)
333 io_printf(f_out, "%s\n", sargs[i]);
334 write_sbuf(f_out, "\n");
338 send_protected_args(f_out, sargs);
340 if (protocol_version < 23) {
341 if (protocol_version == 22 || !am_sender)
342 io_start_multiplex_in(f_in);
350 static char *finish_pre_exec(pid_t pid, int write_fd, int read_fd, char *request,
351 char **early_argv, char **argv)
353 char buf[BIGPATHBUFLEN], *bp;
354 int j = 0, status = -1, msglen = sizeof buf - 1;
359 write_buf(write_fd, request, strlen(request)+1);
361 for ( ; *early_argv; early_argv++)
362 write_buf(write_fd, *early_argv, strlen(*early_argv)+1);
363 j = 1; /* Skip arg0 name in argv. */
365 for ( ; argv[j]; j++)
366 write_buf(write_fd, argv[j], strlen(argv[j])+1);
367 write_byte(write_fd, 0);
371 /* Read the stdout from the pre-xfer exec program. This it is only
372 * displayed to the user if the script also returns an error status. */
373 for (bp = buf; msglen > 0; msglen -= j) {
374 if ((j = read(read_fd, bp, msglen)) <= 0) {
379 break; /* Just ignore the read error for now... */
382 if (j > 1 && bp[-1] == '\n' && bp[-2] == '\r') {
392 if (wait_process(pid, &status, 0) < 0
393 || !WIFEXITED(status) || WEXITSTATUS(status) != 0) {
395 if (asprintf(&e, "pre-xfer exec returned failure (%d)%s%s%s\n%s",
396 status, status < 0 ? ": " : "",
397 status < 0 ? strerror(errno) : "",
398 *buf ? ":" : "", buf) < 0)
399 return "out_of_memory in finish_pre_exec\n";
406 static int read_arg_from_pipe(int fd, char *buf, int limit)
408 char *bp = buf, *eob = buf + limit - 1;
411 int got = read(fd, bp, 1);
413 if (got < 0 && errno == EINTR)
428 static int path_failure(int f_out, const char *dir, BOOL was_chdir)
431 rsyserr(FLOG, errno, "chdir %s failed", dir);
433 rprintf(FLOG, "normalize_path(%s) failed\n", dir);
434 io_printf(f_out, "@ERROR: chdir failed\n");
438 static int add_a_group(int f_out, const char *gname)
441 if (!group_to_gid(gname, &gid, True)) {
442 rprintf(FLOG, "Invalid gid %s\n", gname);
443 io_printf(f_out, "@ERROR: invalid gid %s\n", gname);
446 gid_p = EXPAND_ITEM_LIST(&gid_list, gid_t, -32);
451 #ifdef HAVE_GETGROUPLIST
452 static int want_all_groups(int f_out, uid_t uid)
455 if ((err = getallgroups(uid, &gid_list)) != NULL) {
456 rsyserr(FLOG, errno, "%s", err);
457 io_printf(f_out, "@ERROR: %s\n", err);
462 #elif defined HAVE_INITGROUPS
463 static struct passwd *want_all_groups(int f_out, uid_t uid)
467 if ((pw = getpwuid(uid)) == NULL) {
468 rsyserr(FLOG, errno, "getpwuid failed");
469 io_printf(f_out, "@ERROR: getpwuid failed\n");
472 /* Start with the default group and initgroups() will add the rest. */
473 gid_p = EXPAND_ITEM_LIST(&gid_list, gid_t, -32);
479 static void set_env_str(const char *var, const char *str)
483 if (asprintf(&mem, "%s=%s", var, str) < 0)
484 out_of_memory("set_env_str");
490 void set_env_num(const char *var, long num)
493 if (asprintf(&mem, "%s=%ld", var, num) < 0)
494 out_of_memory("set_env_num");
499 static int rsync_module(int f_in, int f_out, int i, const char *addr, const char *host)
502 char **argv, **orig_argv, **orig_early_argv, *module_chdir;
503 char line[BIGPATHBUFLEN];
504 #if defined HAVE_INITGROUPS && !defined HAVE_GETGROUPLIST
505 struct passwd *pw = NULL;
509 char *p, *err_msg = NULL;
510 char *name = lp_name(i);
511 int use_chroot = lp_use_chroot(i);
512 int ret, pre_exec_arg_fd = -1, pre_exec_error_fd = -1;
513 int save_munge_symlinks;
514 pid_t pre_exec_pid = 0;
515 char *request = NULL;
517 set_env_str("RSYNC_MODULE_NAME", name);
520 iconv_opt = lp_charset(i);
526 /* If reverse lookup is disabled globally but enabled for this module,
527 * we need to do it now before the access check. */
528 if (host == undetermined_hostname && lp_reverse_lookup(i))
529 host = client_name(f_in);
530 set_env_str("RSYNC_HOST_NAME", host);
531 set_env_str("RSYNC_HOST_ADDR", addr);
533 if (!allow_access(addr, &host, i)) {
534 rprintf(FLOG, "rsync denied on module %s from %s (%s)\n",
537 io_printf(f_out, "@ERROR: Unknown module '%s'\n", name);
540 "@ERROR: access denied to %s from %s (%s)\n",
546 if (am_daemon && am_server) {
547 rprintf(FLOG, "rsync allowed access on module %s from %s (%s)\n",
551 if (!claim_connection(lp_lock_file(i), lp_max_connections(i))) {
553 rsyserr(FLOG, errno, "failed to open lock file %s",
555 io_printf(f_out, "@ERROR: failed to open lock file\n");
557 rprintf(FLOG, "max connections (%d) reached\n",
558 lp_max_connections(i));
559 io_printf(f_out, "@ERROR: max connections (%d) reached -- try again later\n",
560 lp_max_connections(i));
565 read_only = lp_read_only(i); /* may also be overridden by auth_server() */
566 auth_user = auth_server(f_in, f_out, i, host, addr, "@RSYNCD: AUTHREQD ");
569 io_printf(f_out, "@ERROR: auth failed on module %s\n", name);
572 set_env_str("RSYNC_USER_NAME", auth_user);
576 if (lp_transfer_logging(i) && !logfile_format)
577 logfile_format = lp_log_format(i);
578 if (log_format_has(logfile_format, 'i'))
579 logfile_format_has_i = 1;
580 if (logfile_format_has_i || log_format_has(logfile_format, 'o'))
581 logfile_format_has_o_or_i = 1;
584 am_root = (uid == 0);
586 p = *lp_uid(i) ? lp_uid(i) : am_root ? NOBODY_USER : NULL;
588 if (!user_to_uid(p, &uid, True)) {
589 rprintf(FLOG, "Invalid uid %s\n", p);
590 io_printf(f_out, "@ERROR: invalid uid %s\n", p);
597 p = *lp_gid(i) ? conf_strtok(lp_gid(i)) : NULL;
599 /* The "*" gid must be the first item in the list. */
600 if (strcmp(p, "*") == 0) {
601 #ifdef HAVE_GETGROUPLIST
602 if (want_all_groups(f_out, uid) < 0)
604 #elif defined HAVE_INITGROUPS
605 if ((pw = want_all_groups(f_out, uid)) == NULL)
608 rprintf(FLOG, "This rsync does not support a gid of \"*\"\n");
609 io_printf(f_out, "@ERROR: invalid gid setting.\n");
612 } else if (add_a_group(f_out, p) < 0)
614 while ((p = conf_strtok(NULL)) != NULL) {
615 #if defined HAVE_INITGROUPS && !defined HAVE_GETGROUPLIST
617 rprintf(FLOG, "This rsync cannot add groups after \"*\".\n");
618 io_printf(f_out, "@ERROR: invalid gid setting.\n");
622 if (add_a_group(f_out, p) < 0)
625 } else if (am_root) {
626 if (add_a_group(f_out, NOBODY_GROUP) < 0)
630 module_dir = lp_path(i);
631 if (*module_dir == '\0') {
632 rprintf(FLOG, "No path specified for module %s\n", name);
633 io_printf(f_out, "@ERROR: no path setting.\n");
637 if ((p = strstr(module_dir, "/./")) != NULL) {
638 *p = '\0'; /* Temporary... */
639 if (!(module_chdir = normalize_path(module_dir, True, NULL)))
640 return path_failure(f_out, module_dir, False);
642 if (!(p = normalize_path(p + 2, True, &module_dirlen)))
643 return path_failure(f_out, strstr(module_dir, "/./"), False);
644 if (!(full_module_path = normalize_path(module_dir, False, NULL)))
645 full_module_path = module_dir;
648 if (!(module_chdir = normalize_path(module_dir, False, NULL)))
649 return path_failure(f_out, module_dir, False);
650 full_module_path = module_chdir;
655 if (!(module_chdir = normalize_path(module_dir, False, &module_dirlen)))
656 return path_failure(f_out, module_dir, False);
657 full_module_path = module_dir = module_chdir;
659 set_env_str("RSYNC_MODULE_PATH", full_module_path);
661 if (module_dirlen == 1) {
663 set_filter_dir("/", 1);
665 set_filter_dir(module_dir, module_dirlen);
668 parse_filter_str(&daemon_filter_list, p, rule_template(FILTRULE_WORD_SPLIT),
669 XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3);
671 p = lp_include_from(i);
672 parse_filter_file(&daemon_filter_list, p, rule_template(FILTRULE_INCLUDE),
673 XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3 | XFLG_OLD_PREFIXES | XFLG_FATAL_ERRORS);
676 parse_filter_str(&daemon_filter_list, p,
677 rule_template(FILTRULE_INCLUDE | FILTRULE_WORD_SPLIT),
678 XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3 | XFLG_OLD_PREFIXES);
680 p = lp_exclude_from(i);
681 parse_filter_file(&daemon_filter_list, p, rule_template(0),
682 XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3 | XFLG_OLD_PREFIXES | XFLG_FATAL_ERRORS);
685 parse_filter_str(&daemon_filter_list, p, rule_template(FILTRULE_WORD_SPLIT),
686 XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3 | XFLG_OLD_PREFIXES);
691 if ((*lp_prexfer_exec(i) || *lp_postxfer_exec(i)) && !getenv("RSYNC_NO_XFER_EXEC")) {
694 /* For post-xfer exec, fork a new process to run the rsync
695 * daemon while this process waits for the exit status and
696 * runs the indicated command at that point. */
697 if (*lp_postxfer_exec(i)) {
700 rsyserr(FLOG, errno, "fork failed");
701 io_printf(f_out, "@ERROR: fork failed\n");
708 set_env_num("RSYNC_PID", (long)pid);
709 if (wait_process(pid, &status, 0) < 0)
711 set_env_num("RSYNC_RAW_STATUS", status);
712 if (WIFEXITED(status))
713 status = WEXITSTATUS(status);
716 set_env_num("RSYNC_EXIT_STATUS", status);
717 if (shell_exec(lp_postxfer_exec(i)) < 0)
722 /* For pre-xfer exec, fork a child process to run the indicated
723 * command, though it first waits for the parent process to
724 * send us the user's request via a pipe. */
725 if (*lp_prexfer_exec(i)) {
726 int arg_fds[2], error_fds[2];
727 set_env_num("RSYNC_PID", (long)getpid());
728 if (pipe(arg_fds) < 0 || pipe(error_fds) < 0 || (pre_exec_pid = fork()) < 0) {
729 rsyserr(FLOG, errno, "pre-xfer exec preparation failed");
730 io_printf(f_out, "@ERROR: pre-xfer exec preparation failed\n");
733 if (pre_exec_pid == 0) {
734 char buf[BIGPATHBUFLEN];
738 pre_exec_arg_fd = arg_fds[0];
739 pre_exec_error_fd = error_fds[1];
740 set_blocking(pre_exec_arg_fd);
741 set_blocking(pre_exec_error_fd);
742 len = read_arg_from_pipe(pre_exec_arg_fd, buf, BIGPATHBUFLEN);
745 set_env_str("RSYNC_REQUEST", buf);
747 len = read_arg_from_pipe(pre_exec_arg_fd, buf,
754 if (asprintf(&p, "RSYNC_ARG%d=%s", j, buf) >= 0)
757 close(pre_exec_arg_fd);
759 dup2(pre_exec_error_fd, STDOUT_FILENO);
760 close(pre_exec_error_fd);
761 status = shell_exec(lp_prexfer_exec(i));
762 if (!WIFEXITED(status))
764 _exit(WEXITSTATUS(status));
768 pre_exec_arg_fd = arg_fds[1];
769 pre_exec_error_fd = error_fds[0];
770 set_blocking(pre_exec_arg_fd);
771 set_blocking(pre_exec_error_fd);
778 * XXX: The 'use chroot' flag is a fairly reliable
779 * source of confusion, because it fails under two
780 * important circumstances: running as non-root,
781 * running on Win32 (or possibly others). On the
782 * other hand, if you are running as root, then it
783 * might be better to always use chroot.
785 * So, perhaps if we can't chroot we should just issue
786 * a warning, unless a "require chroot" flag is set,
787 * in which case we fail.
789 if (chroot(module_chdir)) {
790 rsyserr(FLOG, errno, "chroot %s failed", module_chdir);
791 io_printf(f_out, "@ERROR: chroot failed\n");
794 module_chdir = module_dir;
797 if (!change_dir(module_chdir, CD_NORMAL))
798 return path_failure(f_out, module_chdir, True);
799 if (module_dirlen || (!use_chroot && !*lp_daemon_chroot()))
802 if ((munge_symlinks = lp_munge_symlinks(i)) < 0)
803 munge_symlinks = !use_chroot || module_dirlen;
804 if (munge_symlinks) {
806 char prefix[SYMLINK_PREFIX_LEN]; /* NOT +1 ! */
807 strlcpy(prefix, SYMLINK_PREFIX, sizeof prefix); /* trim the trailing slash */
808 if (do_stat(prefix, &st) == 0 && S_ISDIR(st.st_mode)) {
809 rprintf(FLOG, "Symlink munging is unsafe when a %s directory exists.\n",
811 io_printf(f_out, "@ERROR: daemon security issue -- contact admin\n", name);
812 exit_cleanup(RERR_UNSUPPORTED);
816 if (gid_list.count) {
817 gid_t *gid_array = gid_list.items;
818 if (setgid(gid_array[0])) {
819 rsyserr(FLOG, errno, "setgid %ld failed", (long)gid_array[0]);
820 io_printf(f_out, "@ERROR: setgid failed\n");
823 #ifdef HAVE_SETGROUPS
824 /* Set the group(s) we want to be active. */
825 if (setgroups(gid_list.count, gid_array)) {
826 rsyserr(FLOG, errno, "setgroups failed");
827 io_printf(f_out, "@ERROR: setgroups failed\n");
831 #if defined HAVE_INITGROUPS && !defined HAVE_GETGROUPLIST
832 /* pw is set if the user wants all the user's groups. */
833 if (pw && initgroups(pw->pw_name, pw->pw_gid) < 0) {
834 rsyserr(FLOG, errno, "initgroups failed");
835 io_printf(f_out, "@ERROR: initgroups failed\n");
848 rsyserr(FLOG, errno, "setuid %ld failed", (long)uid);
849 io_printf(f_out, "@ERROR: setuid failed\n");
854 am_root = (our_uid == 0);
857 if (lp_temp_dir(i) && *lp_temp_dir(i)) {
858 tmpdir = lp_temp_dir(i);
859 if (strlen(tmpdir) >= MAXPATHLEN - 10) {
861 "the 'temp dir' value for %s is WAY too long -- ignoring.\n",
867 io_printf(f_out, "@RSYNCD: OK\n");
869 read_args(f_in, name, line, sizeof line, rl_nulls, &argv, &argc, &request);
872 save_munge_symlinks = munge_symlinks;
874 reset_output_levels(); /* future verbosity is controlled by client options */
875 ret = parse_arguments(&argc, (const char ***) &argv);
876 if (protect_args && ret) {
877 orig_early_argv = orig_argv;
879 read_args(f_in, name, line, sizeof line, 1, &argv, &argc, &request);
881 ret = parse_arguments(&argc, (const char ***) &argv);
883 orig_early_argv = NULL;
885 munge_symlinks = save_munge_symlinks; /* The client mustn't control this. */
888 err_msg = finish_pre_exec(pre_exec_pid, pre_exec_arg_fd, pre_exec_error_fd,
889 request, orig_early_argv, orig_argv);
893 free(orig_early_argv);
895 am_server = 1; /* Don't let someone try to be tricky. */
897 if (lp_ignore_errors(module_id))
902 if (lp_fake_super(i)) {
903 if (preserve_xattrs > 1)
906 } else if (am_root < 0) /* Treat --fake-super from client as --super. */
909 if (filesfrom_fd == 0)
914 rprintf(FLOG, "rsync %s %s from %s@%s (%s)\n",
915 am_sender ? "on" : "to",
916 request, auth_user, host, addr);
918 rprintf(FLOG, "rsync %s %s from %s (%s)\n",
919 am_sender ? "on" : "to",
920 request, host, addr);
926 /* don't allow the logs to be flooded too fast */
927 limit_output_verbosity(lp_max_verbosity(i));
930 if (protocol_version < 23
931 && (protocol_version == 22 || am_sender))
932 io_start_multiplex_out(f_out);
933 else if (!ret || err_msg) {
934 /* We have to get I/O multiplexing started so that we can
935 * get the error back to the client. This means getting
936 * the protocol setup finished first in later versions. */
937 setup_protocol(f_out, f_in);
939 /* Since we failed in our option parsing, we may not
940 * have finished parsing that the client sent us a
941 * --files-from option, so look for it manually.
942 * Without this, the socket would be in the wrong
943 * state for the upcoming error message. */
946 for (i = 0; i < argc; i++) {
947 if (strncmp(argv[i], "--files-from", 12) == 0) {
954 write_byte(f_out, 0);
956 io_start_multiplex_out(f_out);
959 if (!ret || err_msg) {
961 while ((p = strchr(err_msg, '\n')) != NULL) {
962 int len = p - err_msg + 1;
963 rwrite(FERROR, err_msg, len, 0);
967 rprintf(FERROR, "%s\n", err_msg);
971 exit_cleanup(RERR_UNSUPPORTED);
976 if (ic_send != (iconv_t)-1) {
977 iconv_close(ic_send);
978 ic_send = (iconv_t)-1;
980 if (ic_recv != (iconv_t)-1) {
981 iconv_close(ic_recv);
982 ic_recv = (iconv_t)-1;
988 && (use_chroot ? lp_numeric_ids(i) != False : lp_numeric_ids(i) == True))
989 numeric_ids = -1; /* Set --numeric-ids w/o breaking protocol. */
991 if (lp_timeout(i) && (!io_timeout || lp_timeout(i) < io_timeout))
992 set_io_timeout(lp_timeout(i));
994 /* If we have some incoming/outgoing chmod changes, append them to
995 * any user-specified changes (making our changes have priority).
996 * We also get a pointer to just our changes so that a receiver
997 * process can use them separately if --perms wasn't specified. */
999 p = lp_outgoing_chmod(i);
1001 p = lp_incoming_chmod(i);
1002 if (*p && !(daemon_chmod_modes = parse_chmod(p, &chmod_modes))) {
1003 rprintf(FLOG, "Invalid \"%sing chmod\" directive: %s\n",
1004 am_sender ? "outgo" : "incom", p);
1007 start_server(f_in, f_out, argc, argv);
1012 /* send a list of available modules to the client. Don't list those
1013 with "list = False". */
1014 static void send_listing(int fd)
1016 int n = lp_num_modules();
1019 for (i = 0; i < n; i++) {
1021 io_printf(fd, "%-15s\t%s\n", lp_name(i), lp_comment(i));
1024 if (protocol_version >= 25)
1025 io_printf(fd,"@RSYNCD: EXIT\n");
1028 static int load_config(int globals_only)
1031 if (am_server && am_root <= 0)
1032 config_file = RSYNCD_USERCONF;
1034 config_file = RSYNCD_SYSCONF;
1036 return lp_load(config_file, globals_only);
1039 /* this is called when a connection is established to a client
1040 and we want to start talking. The setup of the system is done from
1042 int start_daemon(int f_in, int f_out)
1045 const char *addr, *host;
1049 io_set_sock_fds(f_in, f_out);
1051 /* We must load the config file before calling any function that
1052 * might cause log-file output to occur. This ensures that the
1053 * "log file" param gets honored for the 2 non-forked use-cases
1054 * (when rsync is run by init and run by a remote shell). */
1055 if (!load_config(0))
1056 exit_cleanup(RERR_SYNTAX);
1058 p = lp_daemon_chroot();
1060 log_init(0); /* Make use we've initialized syslog before chrooting. */
1061 if (chroot(p) < 0 || chdir("/") < 0) {
1062 rsyserr(FLOG, errno, "daemon chroot %s failed", p);
1066 p = lp_daemon_gid();
1069 if (!group_to_gid(p, &gid, True)) {
1070 rprintf(FLOG, "Invalid daemon gid: %s\n", p);
1073 if (setgid(gid) < 0) {
1074 rsyserr(FLOG, errno, "Unable to set group to daemon gid %ld", (long)gid);
1079 p = lp_daemon_uid();
1082 if (!user_to_uid(p, &uid, True)) {
1083 rprintf(FLOG, "Invalid daemon uid: %s\n", p);
1086 if (setuid(uid) < 0) {
1087 rsyserr(FLOG, errno, "Unable to set user to daemon uid %ld", (long)uid);
1091 am_root = (our_uid == 0);
1094 addr = client_addr(f_in);
1095 host = lp_reverse_lookup(-1) ? client_name(f_in) : undetermined_hostname;
1096 rprintf(FLOG, "connect from %s (%s)\n", host, addr);
1099 set_socket_options(f_in, "SO_KEEPALIVE");
1100 set_nonblocking(f_in);
1103 if (exchange_protocols(f_in, f_out, line, sizeof line, 0) < 0)
1107 if (!read_line_old(f_in, line, sizeof line, 0))
1110 if (!*line || strcmp(line, "#list") == 0) {
1111 rprintf(FLOG, "module-list request from %s (%s)\n",
1113 send_listing(f_out);
1118 /* it's some sort of command that I don't understand */
1119 io_printf(f_out, "@ERROR: Unknown command '%s'\n", line);
1123 if ((i = lp_number(line)) < 0) {
1124 rprintf(FLOG, "unknown module '%s' tried from %s (%s)\n",
1126 io_printf(f_out, "@ERROR: Unknown module '%s'\n", line);
1130 #ifdef HAVE_SIGACTION
1131 sigact.sa_flags = SA_NOCLDSTOP;
1133 SIGACTION(SIGCHLD, remember_children);
1135 return rsync_module(f_in, f_out, i, addr, host);
1138 static void create_pid_file(void)
1140 char *pid_file = lp_pid_file();
1142 pid_t pid = getpid();
1145 if (!pid_file || !*pid_file)
1148 cleanup_set_pid(pid);
1149 if ((fd = do_open(pid_file, O_WRONLY|O_CREAT|O_EXCL, 0666)) == -1) {
1152 fprintf(stderr, "failed to create pid file %s: %s\n", pid_file, strerror(errno));
1153 rsyserr(FLOG, errno, "failed to create pid file %s", pid_file);
1154 exit_cleanup(RERR_FILEIO);
1156 snprintf(pidbuf, sizeof pidbuf, "%d\n", (int)pid);
1157 len = strlen(pidbuf);
1158 if (write(fd, pidbuf, len) != len)
1163 /* Become a daemon, discarding the controlling terminal. */
1164 static void become_daemon(void)
1171 fprintf(stderr, "failed to fork: %s\n", strerror(errno));
1172 exit_cleanup(RERR_FILEIO);
1179 /* detach from the terminal */
1182 #elif defined TIOCNOTTY
1183 i = open("/dev/tty", O_RDWR);
1185 ioctl(i, (int)TIOCNOTTY, (char *)0);
1189 /* make sure that stdin, stdout an stderr don't stuff things
1190 * up (library functions, for example) */
1191 for (i = 0; i < 3; i++) {
1193 open("/dev/null", O_RDWR);
1197 int daemon_main(void)
1199 if (is_a_socket(STDIN_FILENO)) {
1202 /* we are running via inetd - close off stdout and
1203 * stderr so that library functions (and getopt) don't
1204 * try to use them. Redirect them to /dev/null */
1205 for (i = 1; i < 3; i++) {
1207 open("/dev/null", O_RDWR);
1210 return start_daemon(STDIN_FILENO, STDIN_FILENO);
1213 if (!load_config(1)) {
1214 fprintf(stderr, "Failed to parse config file: %s\n", config_file);
1215 exit_cleanup(RERR_SYNTAX);
1224 if (rsync_port == 0 && (rsync_port = lp_rsync_port()) == 0)
1225 rsync_port = RSYNC_PORT;
1226 if (bind_address == NULL && *lp_bind_address())
1227 bind_address = lp_bind_address();
1231 rprintf(FLOG, "rsyncd version %s starting, listening on port %d\n",
1232 RSYNC_VERSION, rsync_port);
1233 /* TODO: If listening on a particular address, then show that
1234 * address too. In fact, why not just do getnameinfo on the
1235 * local address??? */
1237 start_accept_loop(rsync_port, start_daemon);