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 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;
63 #define MAX_GID_LIST 32
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 gid_t gid_list[MAX_GID_LIST];
85 static int gid_count = 0;
87 /* Used when "reverse lookup" is off. */
88 const char undetermined_hostname[] = "UNDETERMINED";
91 * Run a client connected to an rsyncd. The alternative to this
92 * function for remote-shell connections is do_cmd().
94 * After negotiating which module to use and reading the server's
95 * motd, this hands over to client_run(). Telling the server the
96 * module will cause it to chroot/setuid/etc.
98 * Instead of doing a transfer, the client may at this stage instead
99 * get a listing of remote modules and exit.
101 * @return -1 for error in startup, or the result of client_run().
102 * Either way, it eventually gets passed to exit_cleanup().
104 int start_socket_client(char *host, int remote_argc, char *remote_argv[],
105 int argc, char *argv[])
108 char *p, *user = NULL;
110 /* This is redundant with code in start_inband_exchange(), but this
111 * short-circuits a problem in the client before we open a socket,
112 * and the extra check won't hurt. */
113 if (**remote_argv == '/') {
115 "ERROR: The remote path must start with a module name not a /\n");
119 if ((p = strrchr(host, '@')) != NULL) {
125 fd = open_socket_out_wrapped(host, rsync_port, bind_address,
128 exit_cleanup(RERR_SOCKETIO);
134 ret = start_inband_exchange(fd, fd, user, remote_argc, remote_argv);
136 return ret ? ret : client_run(fd, fd, -1, argc, argv);
139 static int exchange_protocols(int f_in, int f_out, char *buf, size_t bufsiz, int am_client)
142 #if SUBPROTOCOL_VERSION != 0
143 int our_sub = protocol_version < PROTOCOL_VERSION ? 0 : SUBPROTOCOL_VERSION;
149 io_printf(f_out, "@RSYNCD: %d.%d\n", protocol_version, our_sub);
152 motd = lp_motd_file();
154 FILE *f = fopen(motd,"r");
155 while (f && !feof(f)) {
156 int len = fread(buf, 1, bufsiz - 1, f);
158 write_buf(f_out, buf, len);
162 write_sbuf(f_out, "\n");
166 /* This strips the \n. */
167 if (!read_line_old(f_in, buf, bufsiz, 0)) {
169 rprintf(FERROR, "rsync: did not see server greeting\n");
173 if (sscanf(buf, "@RSYNCD: %d.%d", &remote_protocol, &remote_sub) < 1) {
175 rprintf(FERROR, "rsync: server sent \"%s\" rather than greeting\n", buf);
177 io_printf(f_out, "@ERROR: protocol startup error\n");
181 if (remote_sub < 0) {
182 if (remote_protocol == 30) {
184 rprintf(FERROR, "rsync: server is speaking an incompatible beta of protocol 30\n");
186 io_printf(f_out, "@ERROR: your client is speaking an incompatible beta of protocol 30\n");
192 if (protocol_version > remote_protocol) {
193 protocol_version = remote_protocol;
196 } else if (protocol_version == remote_protocol) {
197 if (remote_sub != our_sub)
200 #if SUBPROTOCOL_VERSION != 0
201 else if (protocol_version < remote_protocol) {
207 if (protocol_version >= 30)
213 int start_inband_exchange(int f_in, int f_out, const char *user, int argc, char *argv[])
216 char line[BIGPATHBUFLEN];
217 char *sargs[MAX_ARGS];
221 assert(argc > 0 && *argv != NULL);
225 "ERROR: The remote path must start with a module name\n");
229 if (!(p = strchr(*argv, '/')))
230 modlen = strlen(*argv);
234 if (!(modname = new_array(char, modlen+1+1))) /* room for '/' & '\0' */
235 out_of_memory("start_inband_exchange");
236 strlcpy(modname, *argv, modlen + 1);
237 modname[modlen] = '/';
238 modname[modlen+1] = '\0';
241 user = getenv("USER");
243 user = getenv("LOGNAME");
245 if (exchange_protocols(f_in, f_out, line, sizeof line, 1) < 0)
248 /* set daemon_over_rsh to false since we need to build the
249 * true set of args passed through the rsh/ssh connection;
250 * this is a no-op for direct-socket-connection mode */
252 server_options(sargs, &sargc);
254 if (sargc >= MAX_ARGS - 2)
257 sargs[sargc++] = ".";
260 if (sargc >= MAX_ARGS - 1) {
262 rprintf(FERROR, "internal: args[] overflowed in do_cmd()\n");
263 exit_cleanup(RERR_SYNTAX);
265 if (strncmp(*argv, modname, modlen) == 0
266 && argv[0][modlen] == '\0')
267 sargs[sargc++] = modname; /* we send "modname/" */
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 fd, char *request,
349 char **early_argv, char **argv)
351 int j = 0, status = -1;
356 write_buf(fd, request, strlen(request)+1);
358 for ( ; *early_argv; early_argv++)
359 write_buf(fd, *early_argv, strlen(*early_argv)+1);
360 j = 1; /* Skip arg0 name in argv. */
362 for ( ; argv[j]; j++) {
363 write_buf(fd, argv[j], strlen(argv[j])+1);
364 if (argv[j][0] == '.' && argv[j][1] == '\0')
371 if (wait_process(pid, &status, 0) < 0
372 || !WIFEXITED(status) || WEXITSTATUS(status) != 0) {
374 if (asprintf(&e, "pre-xfer exec returned failure (%d)%s%s\n",
375 status, status < 0 ? ": " : "",
376 status < 0 ? strerror(errno) : "") < 0)
377 out_of_memory("finish_pre_exec");
384 static int read_arg_from_pipe(int fd, char *buf, int limit)
386 char *bp = buf, *eob = buf + limit - 1;
389 int got = read(fd, bp, 1);
391 if (got < 0 && errno == EINTR)
406 static int path_failure(int f_out, const char *dir, BOOL was_chdir)
409 rsyserr(FLOG, errno, "chdir %s failed\n", dir);
411 rprintf(FLOG, "normalize_path(%s) failed\n", dir);
412 io_printf(f_out, "@ERROR: chdir failed\n");
416 static int add_a_group(int f_out, const char *gname)
419 if (!group_to_gid(gname, &gid, True)) {
420 rprintf(FLOG, "Invalid gid %s\n", gname);
421 io_printf(f_out, "@ERROR: invalid gid %s\n", gname);
424 if (gid_count == MAX_GID_LIST) {
425 rprintf(FLOG, "Too many groups specified via gid parameter.\n");
426 io_printf(f_out, "@ERROR: too many groups\n");
429 gid_list[gid_count++] = gid;
433 #ifdef HAVE_GETGROUPLIST
434 static int want_all_groups(int f_out, uid_t uid)
437 gid_count = MAX_GID_LIST;
438 if ((err = getallgroups(uid, gid_list, &gid_count)) != NULL) {
439 rsyserr(FLOG, errno, "%s", err);
440 io_printf(f_out, "@ERROR: %s\n", err);
445 #elif defined HAVE_INITGROUPS
446 static struct passwd *want_all_groups(int f_out, uid_t uid)
449 if ((pw = getpwuid(uid)) == NULL) {
450 rsyserr(FLOG, errno, "getpwuid failed");
451 io_printf(f_out, "@ERROR: getpwuid failed\n");
454 /* Start with the default group and initgroups() will add the reset. */
456 gid_list[0] = pw->pw_gid;
461 static void set_env_str(const char *var, const char *str)
465 if (asprintf(&mem, "%s=%s", var, str) < 0)
466 out_of_memory("set_env_str");
472 static void set_env_num(const char *var, long num)
475 if (asprintf(&mem, "%s=%ld", var, num) < 0)
476 out_of_memory("set_env_num");
481 static int rsync_module(int f_in, int f_out, int i, const char *addr, const char *host)
484 char **argv, **orig_argv, **orig_early_argv, *module_chdir;
485 char line[BIGPATHBUFLEN];
486 #if defined HAVE_INITGROUPS && !defined HAVE_GETGROUPLIST
487 struct passwd *pw = NULL;
491 char *p, *err_msg = NULL;
492 char *name = lp_name(i);
493 int use_chroot = lp_use_chroot(i);
494 int ret, pre_exec_fd = -1;
495 int save_munge_symlinks;
496 pid_t pre_exec_pid = 0;
497 char *request = NULL;
499 set_env_str("RSYNC_MODULE_NAME", name);
502 iconv_opt = lp_charset(i);
508 /* If reverse lookup is disabled globally but enabled for this module,
509 * we need to do it now before the access check. */
510 if (host == undetermined_hostname && lp_reverse_lookup(i))
511 host = client_name(f_in);
512 set_env_str("RSYNC_HOST_NAME", host);
513 set_env_str("RSYNC_HOST_ADDR", addr);
515 if (!allow_access(addr, host, lp_hosts_allow(i), lp_hosts_deny(i))) {
516 rprintf(FLOG, "rsync denied on module %s from %s (%s)\n",
519 io_printf(f_out, "@ERROR: Unknown module '%s'\n", name);
522 "@ERROR: access denied to %s from %s (%s)\n",
528 if (am_daemon && am_server) {
529 rprintf(FLOG, "rsync allowed access on module %s from %s (%s)\n",
533 if (!claim_connection(lp_lock_file(i), lp_max_connections(i))) {
535 rsyserr(FLOG, errno, "failed to open lock file %s",
537 io_printf(f_out, "@ERROR: failed to open lock file\n");
539 rprintf(FLOG, "max connections (%d) reached\n",
540 lp_max_connections(i));
541 io_printf(f_out, "@ERROR: max connections (%d) reached -- try again later\n",
542 lp_max_connections(i));
547 read_only = lp_read_only(i); /* may also be overridden by auth_server() */
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);
558 if (lp_transfer_logging(i) && !logfile_format)
559 logfile_format = lp_log_format(i);
560 if (log_format_has(logfile_format, 'i'))
561 logfile_format_has_i = 1;
562 if (logfile_format_has_i || log_format_has(logfile_format, 'o'))
563 logfile_format_has_o_or_i = 1;
566 am_root = (uid == 0);
568 p = *lp_uid(i) ? lp_uid(i) : am_root ? NOBODY_USER : NULL;
570 if (!user_to_uid(p, &uid, True)) {
571 rprintf(FLOG, "Invalid uid %s\n", p);
572 io_printf(f_out, "@ERROR: invalid uid %s\n", p);
579 p = *lp_gid(i) ? strtok(lp_gid(i), ", ") : NULL;
581 /* The "*" gid must be the first item in the list. */
582 if (strcmp(p, "*") == 0) {
583 #ifdef HAVE_GETGROUPLIST
584 if (want_all_groups(f_out, uid) < 0)
586 #elif defined HAVE_INITGROUPS
587 if ((pw = want_all_groups(f_out, uid)) == NULL)
590 rprintf(FLOG, "This rsync does not support a gid of \"*\"\n");
591 io_printf(f_out, "@ERROR: invalid gid setting.\n");
594 } else if (add_a_group(f_out, p) < 0)
596 while ((p = strtok(NULL, ", ")) != NULL) {
597 #if defined HAVE_INITGROUPS && !defined HAVE_GETGROUPLIST
599 rprintf(FLOG, "This rsync cannot add groups after \"*\".\n");
600 io_printf(f_out, "@ERROR: invalid gid setting.\n");
604 if (add_a_group(f_out, p) < 0)
607 } else if (am_root) {
608 if (add_a_group(f_out, NOBODY_GROUP) < 0)
612 module_dir = lp_path(i);
613 if (*module_dir == '\0') {
614 rprintf(FLOG, "No path specified for module %s\n", name);
615 io_printf(f_out, "@ERROR: no path setting.\n");
619 if ((p = strstr(module_dir, "/./")) != NULL) {
620 *p = '\0'; /* Temporary... */
621 if (!(module_chdir = normalize_path(module_dir, True, NULL)))
622 return path_failure(f_out, module_dir, False);
624 if (!(p = normalize_path(p + 2, True, &module_dirlen)))
625 return path_failure(f_out, strstr(module_dir, "/./"), False);
626 if (!(full_module_path = normalize_path(module_dir, False, NULL)))
627 full_module_path = module_dir;
630 if (!(module_chdir = normalize_path(module_dir, False, NULL)))
631 return path_failure(f_out, module_dir, False);
632 full_module_path = module_chdir;
637 if (!(module_chdir = normalize_path(module_dir, False, &module_dirlen)))
638 return path_failure(f_out, module_dir, False);
639 full_module_path = module_dir = module_chdir;
641 set_env_str("RSYNC_MODULE_PATH", full_module_path);
643 if (module_dirlen == 1) {
645 set_filter_dir("/", 1);
647 set_filter_dir(module_dir, module_dirlen);
650 parse_filter_str(&daemon_filter_list, p, rule_template(FILTRULE_WORD_SPLIT),
651 XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3);
653 p = lp_include_from(i);
654 parse_filter_file(&daemon_filter_list, p, rule_template(FILTRULE_INCLUDE),
655 XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3 | XFLG_OLD_PREFIXES | XFLG_FATAL_ERRORS);
658 parse_filter_str(&daemon_filter_list, p,
659 rule_template(FILTRULE_INCLUDE | FILTRULE_WORD_SPLIT),
660 XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3 | XFLG_OLD_PREFIXES);
662 p = lp_exclude_from(i);
663 parse_filter_file(&daemon_filter_list, p, rule_template(0),
664 XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3 | XFLG_OLD_PREFIXES | XFLG_FATAL_ERRORS);
667 parse_filter_str(&daemon_filter_list, p, rule_template(FILTRULE_WORD_SPLIT),
668 XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3 | XFLG_OLD_PREFIXES);
673 if (*lp_prexfer_exec(i) || *lp_postxfer_exec(i)) {
676 /* For post-xfer exec, fork a new process to run the rsync
677 * daemon while this process waits for the exit status and
678 * runs the indicated command at that point. */
679 if (*lp_postxfer_exec(i)) {
682 rsyserr(FLOG, errno, "fork failed");
683 io_printf(f_out, "@ERROR: fork failed\n");
690 set_env_num("RSYNC_PID", (long)pid);
691 if (wait_process(pid, &status, 0) < 0)
693 set_env_num("RSYNC_RAW_STATUS", status);
694 if (WIFEXITED(status))
695 status = WEXITSTATUS(status);
698 set_env_num("RSYNC_EXIT_STATUS", status);
699 if (system(lp_postxfer_exec(i)) < 0)
704 /* For pre-xfer exec, fork a child process to run the indicated
705 * command, though it first waits for the parent process to
706 * send us the user's request via a pipe. */
707 if (*lp_prexfer_exec(i)) {
709 set_env_num("RSYNC_PID", (long)getpid());
710 if (pipe(fds) < 0 || (pre_exec_pid = fork()) < 0) {
711 rsyserr(FLOG, errno, "pre-xfer exec preparation failed");
712 io_printf(f_out, "@ERROR: pre-xfer exec preparation failed\n");
715 if (pre_exec_pid == 0) {
716 char buf[BIGPATHBUFLEN];
719 set_blocking(fds[0]);
720 len = read_arg_from_pipe(fds[0], buf, BIGPATHBUFLEN);
723 set_env_str("RSYNC_REQUEST", buf);
725 len = read_arg_from_pipe(fds[0], buf,
732 if (asprintf(&p, "RSYNC_ARG%d=%s", j, buf) > 0)
737 close(STDOUT_FILENO);
738 status = system(lp_prexfer_exec(i));
739 if (!WIFEXITED(status))
741 _exit(WEXITSTATUS(status));
744 set_blocking(fds[1]);
745 pre_exec_fd = fds[1];
752 * XXX: The 'use chroot' flag is a fairly reliable
753 * source of confusion, because it fails under two
754 * important circumstances: running as non-root,
755 * running on Win32 (or possibly others). On the
756 * other hand, if you are running as root, then it
757 * might be better to always use chroot.
759 * So, perhaps if we can't chroot we should just issue
760 * a warning, unless a "require chroot" flag is set,
761 * in which case we fail.
763 if (chroot(module_chdir)) {
764 rsyserr(FLOG, errno, "chroot %s failed", module_chdir);
765 io_printf(f_out, "@ERROR: chroot failed\n");
768 module_chdir = module_dir;
771 if (!change_dir(module_chdir, CD_NORMAL))
772 return path_failure(f_out, module_chdir, True);
773 if (module_dirlen || !use_chroot)
776 if ((munge_symlinks = lp_munge_symlinks(i)) < 0)
777 munge_symlinks = !use_chroot || module_dirlen;
778 if (munge_symlinks) {
780 char prefix[SYMLINK_PREFIX_LEN]; /* NOT +1 ! */
781 strlcpy(prefix, SYMLINK_PREFIX, sizeof prefix); /* trim the trailing slash */
782 if (do_stat(prefix, &st) == 0 && S_ISDIR(st.st_mode)) {
783 rprintf(FLOG, "Symlink munging is unsafe when a %s directory exists.\n",
785 io_printf(f_out, "@ERROR: daemon security issue -- contact admin\n", name);
786 exit_cleanup(RERR_UNSUPPORTED);
791 if (setgid(gid_list[0])) {
792 rsyserr(FLOG, errno, "setgid %ld failed", (long)gid_list[0]);
793 io_printf(f_out, "@ERROR: setgid failed\n");
796 #ifdef HAVE_SETGROUPS
797 /* Set the group(s) we want to be active. */
798 if (setgroups(gid_count, gid_list)) {
799 rsyserr(FLOG, errno, "setgroups failed");
800 io_printf(f_out, "@ERROR: setgroups failed\n");
804 #if defined HAVE_INITGROUPS && !defined HAVE_GETGROUPLIST
805 /* pw is set if the user wants all the user's groups. */
806 if (pw && initgroups(pw->pw_name, pw->pw_gid) < 0) {
807 rsyserr(FLOG, errno, "initgroups failed");
808 io_printf(f_out, "@ERROR: initgroups failed\n");
820 rsyserr(FLOG, errno, "setuid %ld failed", (long)uid);
821 io_printf(f_out, "@ERROR: setuid failed\n");
825 am_root = (MY_UID() == 0);
828 if (lp_temp_dir(i) && *lp_temp_dir(i)) {
829 tmpdir = lp_temp_dir(i);
830 if (strlen(tmpdir) >= MAXPATHLEN - 10) {
832 "the 'temp dir' value for %s is WAY too long -- ignoring.\n",
838 io_printf(f_out, "@RSYNCD: OK\n");
840 read_args(f_in, name, line, sizeof line, rl_nulls, &argv, &argc, &request);
843 save_munge_symlinks = munge_symlinks;
845 reset_output_levels(); /* future verbosity is controlled by client options */
846 ret = parse_arguments(&argc, (const char ***) &argv);
847 if (protect_args && ret) {
848 orig_early_argv = orig_argv;
850 read_args(f_in, name, line, sizeof line, 1, &argv, &argc, &request);
852 ret = parse_arguments(&argc, (const char ***) &argv);
854 orig_early_argv = NULL;
856 munge_symlinks = save_munge_symlinks; /* The client mustn't control this. */
859 err_msg = finish_pre_exec(pre_exec_pid, pre_exec_fd, request,
860 orig_early_argv, orig_argv);
864 free(orig_early_argv);
866 am_server = 1; /* Don't let someone try to be tricky. */
868 if (lp_ignore_errors(module_id))
873 if (lp_fake_super(i)) {
874 if (preserve_xattrs > 1)
877 } else if (am_root < 0) /* Treat --fake-super from client as --super. */
880 if (filesfrom_fd == 0)
885 rprintf(FLOG, "rsync %s %s from %s@%s (%s)\n",
886 am_sender ? "on" : "to",
887 request, auth_user, host, addr);
889 rprintf(FLOG, "rsync %s %s from %s (%s)\n",
890 am_sender ? "on" : "to",
891 request, host, addr);
897 /* don't allow the logs to be flooded too fast */
898 limit_output_verbosity(lp_max_verbosity(i));
901 if (protocol_version < 23
902 && (protocol_version == 22 || am_sender))
903 io_start_multiplex_out(f_out);
904 else if (!ret || err_msg) {
905 /* We have to get I/O multiplexing started so that we can
906 * get the error back to the client. This means getting
907 * the protocol setup finished first in later versions. */
908 setup_protocol(f_out, f_in);
910 /* Since we failed in our option parsing, we may not
911 * have finished parsing that the client sent us a
912 * --files-from option, so look for it manually.
913 * Without this, the socket would be in the wrong
914 * state for the upcoming error message. */
917 for (i = 0; i < argc; i++) {
918 if (strncmp(argv[i], "--files-from", 12) == 0) {
925 write_byte(f_out, 0);
927 io_start_multiplex_out(f_out);
930 if (!ret || err_msg) {
932 rwrite(FERROR, err_msg, strlen(err_msg), 0);
936 exit_cleanup(RERR_UNSUPPORTED);
941 if (ic_send != (iconv_t)-1) {
942 iconv_close(ic_send);
943 ic_send = (iconv_t)-1;
945 if (ic_recv != (iconv_t)-1) {
946 iconv_close(ic_recv);
947 ic_recv = (iconv_t)-1;
953 && (use_chroot ? lp_numeric_ids(i) != False : lp_numeric_ids(i) == True))
954 numeric_ids = -1; /* Set --numeric-ids w/o breaking protocol. */
956 if (lp_timeout(i) && (!io_timeout || lp_timeout(i) < io_timeout))
957 set_io_timeout(lp_timeout(i));
959 /* If we have some incoming/outgoing chmod changes, append them to
960 * any user-specified changes (making our changes have priority).
961 * We also get a pointer to just our changes so that a receiver
962 * process can use them separately if --perms wasn't specified. */
964 p = lp_outgoing_chmod(i);
966 p = lp_incoming_chmod(i);
967 if (*p && !(daemon_chmod_modes = parse_chmod(p, &chmod_modes))) {
968 rprintf(FLOG, "Invalid \"%sing chmod\" directive: %s\n",
969 am_sender ? "outgo" : "incom", p);
972 start_server(f_in, f_out, argc, argv);
977 /* send a list of available modules to the client. Don't list those
978 with "list = False". */
979 static void send_listing(int fd)
981 int n = lp_num_modules();
984 for (i = 0; i < n; i++) {
986 io_printf(fd, "%-15s\t%s\n", lp_name(i), lp_comment(i));
989 if (protocol_version >= 25)
990 io_printf(fd,"@RSYNCD: EXIT\n");
993 static int load_config(int globals_only)
996 if (am_server && am_root <= 0)
997 config_file = RSYNCD_USERCONF;
999 config_file = RSYNCD_SYSCONF;
1001 return lp_load(config_file, globals_only);
1004 /* this is called when a connection is established to a client
1005 and we want to start talking. The setup of the system is done from
1007 int start_daemon(int f_in, int f_out)
1010 const char *addr, *host;
1013 io_set_sock_fds(f_in, f_out);
1015 /* We must load the config file before calling any function that
1016 * might cause log-file output to occur. This ensures that the
1017 * "log file" param gets honored for the 2 non-forked use-cases
1018 * (when rsync is run by init and run by a remote shell). */
1019 if (!load_config(0))
1020 exit_cleanup(RERR_SYNTAX);
1022 addr = client_addr(f_in);
1023 host = lp_reverse_lookup(-1) ? client_name(f_in) : undetermined_hostname;
1024 rprintf(FLOG, "connect from %s (%s)\n", host, addr);
1027 set_socket_options(f_in, "SO_KEEPALIVE");
1028 set_nonblocking(f_in);
1031 if (exchange_protocols(f_in, f_out, line, sizeof line, 0) < 0)
1035 if (!read_line_old(f_in, line, sizeof line, 0))
1038 if (!*line || strcmp(line, "#list") == 0) {
1039 rprintf(FLOG, "module-list request from %s (%s)\n",
1041 send_listing(f_out);
1046 /* it's some sort of command that I don't understand */
1047 io_printf(f_out, "@ERROR: Unknown command '%s'\n", line);
1051 if ((i = lp_number(line)) < 0) {
1052 rprintf(FLOG, "unknown module '%s' tried from %s (%s)\n",
1054 io_printf(f_out, "@ERROR: Unknown module '%s'\n", line);
1058 #ifdef HAVE_SIGACTION
1059 sigact.sa_flags = SA_NOCLDSTOP;
1061 SIGACTION(SIGCHLD, remember_children);
1063 return rsync_module(f_in, f_out, i, addr, host);
1066 static void create_pid_file(void)
1068 char *pid_file = lp_pid_file();
1070 pid_t pid = getpid();
1073 if (!pid_file || !*pid_file)
1076 cleanup_set_pid(pid);
1077 if ((fd = do_open(pid_file, O_WRONLY|O_CREAT|O_EXCL, 0666)) == -1) {
1080 fprintf(stderr, "failed to create pid file %s: %s\n", pid_file, strerror(errno));
1081 rsyserr(FLOG, errno, "failed to create pid file %s", pid_file);
1082 exit_cleanup(RERR_FILEIO);
1084 snprintf(pidbuf, sizeof pidbuf, "%ld\n", (long)pid);
1085 len = strlen(pidbuf);
1086 if (write(fd, pidbuf, len) != len)
1091 /* Become a daemon, discarding the controlling terminal. */
1092 static void become_daemon(void)
1099 fprintf(stderr, "failed to fork: %s\n", strerror(errno));
1100 exit_cleanup(RERR_FILEIO);
1107 /* detach from the terminal */
1110 #elif defined TIOCNOTTY
1111 i = open("/dev/tty", O_RDWR);
1113 ioctl(i, (int)TIOCNOTTY, (char *)0);
1117 /* make sure that stdin, stdout an stderr don't stuff things
1118 * up (library functions, for example) */
1119 for (i = 0; i < 3; i++) {
1121 open("/dev/null", O_RDWR);
1125 int daemon_main(void)
1127 if (is_a_socket(STDIN_FILENO)) {
1130 /* we are running via inetd - close off stdout and
1131 * stderr so that library functions (and getopt) don't
1132 * try to use them. Redirect them to /dev/null */
1133 for (i = 1; i < 3; i++) {
1135 open("/dev/null", O_RDWR);
1138 return start_daemon(STDIN_FILENO, STDIN_FILENO);
1141 if (!load_config(1)) {
1142 fprintf(stderr, "Failed to parse config file: %s\n", config_file);
1143 exit_cleanup(RERR_SYNTAX);
1152 if (rsync_port == 0 && (rsync_port = lp_rsync_port()) == 0)
1153 rsync_port = RSYNC_PORT;
1154 if (bind_address == NULL && *lp_bind_address())
1155 bind_address = lp_bind_address();
1159 rprintf(FLOG, "rsyncd version %s starting, listening on port %d\n",
1160 RSYNC_VERSION, rsync_port);
1161 /* TODO: If listening on a particular address, then show that
1162 * address too. In fact, why not just do inet_ntop on the
1163 * local address??? */
1165 start_accept_loop(rsync_port, start_daemon);