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 struct filter_list_struct daemon_filter_list;
59 extern char curr_dir[MAXPATHLEN];
61 extern char *iconv_opt;
62 extern iconv_t ic_send, ic_recv;
65 #define MAX_GID_LIST 32
70 struct chmod_mode_struct *daemon_chmod_modes;
72 /* module_dirlen is the length of the module_dir string when in daemon
73 * mode and module_dir is not "/"; otherwise 0. (Note that a chroot-
74 * enabled module can have a non-"/" module_dir these days.) */
75 char *module_dir = NULL;
76 unsigned int module_dirlen = 0;
78 char *full_module_path;
80 static int rl_nulls = 0;
83 static struct sigaction sigact;
86 static gid_t gid_list[MAX_GID_LIST];
87 static int gid_count = 0;
89 /* Used when "reverse lookup" is off. */
90 const char undetermined_hostname[] = "UNDETERMINED";
93 * Run a client connected to an rsyncd. The alternative to this
94 * function for remote-shell connections is do_cmd().
96 * After negotiating which module to use and reading the server's
97 * motd, this hands over to client_run(). Telling the server the
98 * module will cause it to chroot/setuid/etc.
100 * Instead of doing a transfer, the client may at this stage instead
101 * get a listing of remote modules and exit.
103 * @return -1 for error in startup, or the result of client_run().
104 * Either way, it eventually gets passed to exit_cleanup().
106 int start_socket_client(char *host, int remote_argc, char *remote_argv[],
107 int argc, char *argv[])
110 char *p, *user = NULL;
112 /* This is redundant with code in start_inband_exchange(), but this
113 * short-circuits a problem in the client before we open a socket,
114 * and the extra check won't hurt. */
115 if (**remote_argv == '/') {
117 "ERROR: The remote path must start with a module name not a /\n");
121 if ((p = strrchr(host, '@')) != NULL) {
127 fd = open_socket_out_wrapped(host, rsync_port, bind_address,
130 exit_cleanup(RERR_SOCKETIO);
136 ret = start_inband_exchange(fd, fd, user, remote_argc, remote_argv);
138 return ret ? ret : client_run(fd, fd, -1, argc, argv);
141 static int exchange_protocols(int f_in, int f_out, char *buf, size_t bufsiz, int am_client)
144 #if SUBPROTOCOL_VERSION != 0
145 int our_sub = protocol_version < PROTOCOL_VERSION ? 0 : SUBPROTOCOL_VERSION;
151 io_printf(f_out, "@RSYNCD: %d.%d\n", protocol_version, our_sub);
154 motd = lp_motd_file();
156 FILE *f = fopen(motd,"r");
157 while (f && !feof(f)) {
158 int len = fread(buf, 1, bufsiz - 1, f);
160 write_buf(f_out, buf, len);
164 write_sbuf(f_out, "\n");
168 /* This strips the \n. */
169 if (!read_line_old(f_in, buf, bufsiz)) {
171 rprintf(FERROR, "rsync: did not see server greeting\n");
175 if (sscanf(buf, "@RSYNCD: %d.%d", &remote_protocol, &remote_sub) < 1) {
177 rprintf(FERROR, "rsync: server sent \"%s\" rather than greeting\n", buf);
179 io_printf(f_out, "@ERROR: protocol startup error\n");
183 if (remote_sub < 0) {
184 if (remote_protocol == 30) {
186 rprintf(FERROR, "rsync: server is speaking an incompatible beta of protocol 30\n");
188 io_printf(f_out, "@ERROR: your client is speaking an incompatible beta of protocol 30\n");
194 if (protocol_version > remote_protocol) {
195 protocol_version = remote_protocol;
198 } else if (protocol_version == remote_protocol) {
199 if (remote_sub != our_sub)
202 #if SUBPROTOCOL_VERSION != 0
203 else if (protocol_version < remote_protocol) {
209 if (protocol_version >= 30)
215 int start_inband_exchange(int f_in, int f_out, const char *user, int argc, char *argv[])
218 char line[BIGPATHBUFLEN];
219 char *sargs[MAX_ARGS];
223 assert(argc > 0 && *argv != NULL);
227 "ERROR: The remote path must start with a module name\n");
231 if (!(p = strchr(*argv, '/')))
232 modlen = strlen(*argv);
236 if (!(modname = new_array(char, modlen+1+1))) /* room for '/' & '\0' */
237 out_of_memory("start_inband_exchange");
238 strlcpy(modname, *argv, modlen + 1);
239 modname[modlen] = '/';
240 modname[modlen+1] = '\0';
243 user = getenv("USER");
245 user = getenv("LOGNAME");
247 if (exchange_protocols(f_in, f_out, line, sizeof line, 1) < 0)
250 /* set daemon_over_rsh to false since we need to build the
251 * true set of args passed through the rsh/ssh connection;
252 * this is a no-op for direct-socket-connection mode */
254 server_options(sargs, &sargc);
256 if (sargc >= MAX_ARGS - 2)
259 sargs[sargc++] = ".";
262 if (sargc >= MAX_ARGS - 1) {
264 rprintf(FERROR, "internal: args[] overflowed in do_cmd()\n");
265 exit_cleanup(RERR_SYNTAX);
267 if (strncmp(*argv, modname, modlen) == 0
268 && argv[0][modlen] == '\0')
269 sargs[sargc++] = modname; /* we send "modname/" */
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)) {
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();
350 static char *finish_pre_exec(pid_t pid, int fd, char *request,
351 char **early_argv, char **argv)
353 int j = 0, status = -1;
358 write_buf(fd, request, strlen(request)+1);
360 for ( ; *early_argv; early_argv++)
361 write_buf(fd, *early_argv, strlen(*early_argv)+1);
362 j = 1; /* Skip arg0 name in argv. */
364 for ( ; argv[j]; j++) {
365 write_buf(fd, argv[j], strlen(argv[j])+1);
366 if (argv[j][0] == '.' && argv[j][1] == '\0')
373 if (wait_process(pid, &status, 0) < 0
374 || !WIFEXITED(status) || WEXITSTATUS(status) != 0) {
376 if (asprintf(&e, "pre-xfer exec returned failure (%d)%s%s\n",
377 status, status < 0 ? ": " : "",
378 status < 0 ? strerror(errno) : "") < 0)
379 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)
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 (!name_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 static struct passwd *want_all_groups(int f_out, uid_t uid)
435 #if defined HAVE_GETGROUPLIST || defined HAVE_INITGROUPS
437 if ((pw = getpwuid(uid)) == NULL) {
438 rsyserr(FLOG, errno, "getpwuid failed");
439 io_printf(f_out, "@ERROR: getpwuid failed\n");
442 # ifdef HAVE_GETGROUPLIST
443 /* Get all the process's groups, with the pw_gid group first. */
444 gid_count = MAX_GID_LIST;
445 if (getgrouplist(pw->pw_name, pw->pw_gid, gid_list, &gid_count) < 0) {
446 rsyserr(FLOG, errno, "getgrouplist failed");
447 io_printf(f_out, "@ERROR: getgrouplist failed\n");
450 /* Paranoia: is the default group not first in the list? */
451 if (gid_list[0] != pw->pw_gid) {
453 for (j = 0; j < gid_count; j++) {
454 if (gid_list[j] == pw->pw_gid) {
455 gid_list[j] = gid_list[0];
456 gid_list[0] = pw->pw_gid;
462 /* Start with the default group and initgroups() will add the reset. */
464 gid_list[0] = pw->pw_gid;
468 rprintf(FLOG, "This rsync does not support a gid of \"*\"\n");
469 io_printf(f_out, "@ERROR: invalid gid setting.\n");
474 static int rsync_module(int f_in, int f_out, int i, const char *addr, const char *host)
477 char **argv, **orig_argv, **orig_early_argv, *module_chdir;
478 char line[BIGPATHBUFLEN];
479 struct passwd *pw = NULL;
482 char *p, *err_msg = NULL;
483 char *name = lp_name(i);
484 int use_chroot = lp_use_chroot(i);
485 int ret, pre_exec_fd = -1;
486 int save_munge_symlinks;
487 pid_t pre_exec_pid = 0;
488 char *request = NULL;
491 iconv_opt = lp_charset(i);
497 /* If reverse lookup is disabled globally but enabled for this module,
498 * we need to do it now before the access check. */
499 if (host == undetermined_hostname && lp_reverse_lookup(i))
500 host = client_name(f_in);
502 if (!allow_access(addr, host, lp_hosts_allow(i), lp_hosts_deny(i))) {
503 rprintf(FLOG, "rsync denied on module %s from %s (%s)\n",
506 io_printf(f_out, "@ERROR: Unknown module '%s'\n", name);
509 "@ERROR: access denied to %s from %s (%s)\n",
515 if (am_daemon && am_server) {
516 rprintf(FLOG, "rsync allowed access on module %s from %s (%s)\n",
520 if (!claim_connection(lp_lock_file(i), lp_max_connections(i))) {
522 rsyserr(FLOG, errno, "failed to open lock file %s",
524 io_printf(f_out, "@ERROR: failed to open lock file\n");
526 rprintf(FLOG, "max connections (%d) reached\n",
527 lp_max_connections(i));
528 io_printf(f_out, "@ERROR: max connections (%d) reached -- try again later\n",
529 lp_max_connections(i));
534 auth_user = auth_server(f_in, f_out, i, host, addr, "@RSYNCD: AUTHREQD ");
537 io_printf(f_out, "@ERROR: auth failed on module %s\n", name);
546 if (lp_transfer_logging(i) && !logfile_format)
547 logfile_format = lp_log_format(i);
548 if (log_format_has(logfile_format, 'i'))
549 logfile_format_has_i = 1;
550 if (logfile_format_has_i || log_format_has(logfile_format, 'o'))
551 logfile_format_has_o_or_i = 1;
554 am_root = (uid == 0);
556 p = *lp_uid(i) ? lp_uid(i) : am_root ? NOBODY_USER : NULL;
558 if (!name_to_uid(p, &uid, True)) {
559 rprintf(FLOG, "Invalid uid %s\n", p);
560 io_printf(f_out, "@ERROR: invalid uid %s\n", p);
567 p = *lp_gid(i) ? strtok(lp_gid(i), ", ") : NULL;
569 /* The "*" gid must be the first item in the list. */
570 if (strcmp(p, "*") == 0) {
571 if ((pw = want_all_groups(f_out, uid)) == NULL)
573 } else if (add_a_group(f_out, p) < 0)
575 while ((p = strtok(NULL, ", ")) != NULL) {
576 #if defined HAVE_INITGROUPS && !defined HAVE_GETGROUPLIST
578 rprintf(FLOG, "This rsync cannot add groups after \"*\".\n");
579 io_printf(f_out, "@ERROR: invalid gid setting.\n");
583 if (add_a_group(f_out, p) < 0)
586 } else if (am_root) {
587 if (add_a_group(f_out, NOBODY_GROUP) < 0)
591 module_dir = lp_path(i);
593 if ((p = strstr(module_dir, "/./")) != NULL) {
594 *p = '\0'; /* Temporary... */
595 if (!(module_chdir = normalize_path(module_dir, True, NULL)))
596 return path_failure(f_out, module_dir, False);
598 if (!(p = normalize_path(p + 2, True, &module_dirlen)))
599 return path_failure(f_out, strstr(module_dir, "/./"), False);
600 if (!(full_module_path = normalize_path(module_dir, False, NULL)))
601 full_module_path = module_dir;
604 if (!(module_chdir = normalize_path(module_dir, False, NULL)))
605 return path_failure(f_out, module_dir, False);
606 full_module_path = module_chdir;
611 if (!(module_chdir = normalize_path(module_dir, False, &module_dirlen)))
612 return path_failure(f_out, module_dir, False);
613 full_module_path = module_dir = module_chdir;
616 if (module_dirlen == 1) {
618 set_filter_dir("/", 1);
620 set_filter_dir(module_dir, module_dirlen);
623 load_filter_str(&daemon_filter_list, p, filter_template(MATCHFLG_WORD_SPLIT),
624 XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3);
626 p = lp_include_from(i);
627 load_filter_file(&daemon_filter_list, p, filter_template(MATCHFLG_INCLUDE),
628 XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3 | XFLG_OLD_PREFIXES | XFLG_FATAL_ERRORS);
631 load_filter_str(&daemon_filter_list, p,
632 filter_template(MATCHFLG_INCLUDE | MATCHFLG_WORD_SPLIT),
633 XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3 | XFLG_OLD_PREFIXES);
635 p = lp_exclude_from(i);
636 load_filter_file(&daemon_filter_list, p, filter_template(0),
637 XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3 | XFLG_OLD_PREFIXES | XFLG_FATAL_ERRORS);
640 load_filter_str(&daemon_filter_list, p, filter_template(MATCHFLG_WORD_SPLIT),
641 XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3 | XFLG_OLD_PREFIXES);
646 if (*lp_prexfer_exec(i) || *lp_postxfer_exec(i)) {
647 char *modname, *modpath, *hostaddr, *hostname, *username;
650 if (asprintf(&modname, "RSYNC_MODULE_NAME=%s", name) < 0
651 || asprintf(&modpath, "RSYNC_MODULE_PATH=%s", full_module_path) < 0
652 || asprintf(&hostaddr, "RSYNC_HOST_ADDR=%s", addr) < 0
653 || asprintf(&hostname, "RSYNC_HOST_NAME=%s", host) < 0
654 || asprintf(&username, "RSYNC_USER_NAME=%s", auth_user) < 0)
655 out_of_memory("rsync_module");
662 /* For post-xfer exec, fork a new process to run the rsync
663 * daemon while this process waits for the exit status and
664 * runs the indicated command at that point. */
665 if (*lp_postxfer_exec(i)) {
668 rsyserr(FLOG, errno, "fork failed");
669 io_printf(f_out, "@ERROR: fork failed\n");
673 if (asprintf(&p, "RSYNC_PID=%ld", (long)pid) > 0)
675 if (wait_process(pid, &status, 0) < 0)
677 if (asprintf(&p, "RSYNC_RAW_STATUS=%d", status) > 0)
679 if (WIFEXITED(status))
680 status = WEXITSTATUS(status);
683 if (asprintf(&p, "RSYNC_EXIT_STATUS=%d", status) > 0)
685 if (system(lp_postxfer_exec(i)) < 0)
690 /* For pre-xfer exec, fork a child process to run the indicated
691 * command, though it first waits for the parent process to
692 * send us the user's request via a pipe. */
693 if (*lp_prexfer_exec(i)) {
695 if (asprintf(&p, "RSYNC_PID=%ld", (long)getpid()) > 0)
697 if (pipe(fds) < 0 || (pre_exec_pid = fork()) < 0) {
698 rsyserr(FLOG, errno, "pre-xfer exec preparation failed");
699 io_printf(f_out, "@ERROR: pre-xfer exec preparation failed\n");
702 if (pre_exec_pid == 0) {
703 char buf[BIGPATHBUFLEN];
706 set_blocking(fds[0]);
707 len = read_arg_from_pipe(fds[0], buf, BIGPATHBUFLEN);
710 if (asprintf(&p, "RSYNC_REQUEST=%s", buf) > 0)
713 len = read_arg_from_pipe(fds[0], buf,
720 if (asprintf(&p, "RSYNC_ARG%d=%s", j, buf) > 0)
725 close(STDOUT_FILENO);
726 status = system(lp_prexfer_exec(i));
727 if (!WIFEXITED(status))
729 _exit(WEXITSTATUS(status));
732 set_blocking(fds[1]);
733 pre_exec_fd = fds[1];
741 * XXX: The 'use chroot' flag is a fairly reliable
742 * source of confusion, because it fails under two
743 * important circumstances: running as non-root,
744 * running on Win32 (or possibly others). On the
745 * other hand, if you are running as root, then it
746 * might be better to always use chroot.
748 * So, perhaps if we can't chroot we should just issue
749 * a warning, unless a "require chroot" flag is set,
750 * in which case we fail.
752 if (chroot(module_chdir)) {
753 rsyserr(FLOG, errno, "chroot %s failed", module_chdir);
754 io_printf(f_out, "@ERROR: chroot failed\n");
757 module_chdir = module_dir;
760 if (!change_dir(module_chdir, CD_NORMAL))
761 return path_failure(f_out, module_chdir, True);
762 if (module_dirlen || !use_chroot)
765 if ((munge_symlinks = lp_munge_symlinks(i)) < 0)
766 munge_symlinks = !use_chroot || module_dirlen;
767 if (munge_symlinks) {
769 char prefix[SYMLINK_PREFIX_LEN]; /* NOT +1 ! */
770 strlcpy(prefix, SYMLINK_PREFIX, sizeof prefix); /* trim the trailing slash */
771 if (do_stat(prefix, &st) == 0 && S_ISDIR(st.st_mode)) {
772 rprintf(FLOG, "Symlink munging is unsafe when a %s directory exists.\n",
774 io_printf(f_out, "@ERROR: daemon security issue -- contact admin\n", name);
775 exit_cleanup(RERR_UNSUPPORTED);
780 if (setgid(gid_list[0])) {
781 rsyserr(FLOG, errno, "setgid %ld failed", (long)gid_list[0]);
782 io_printf(f_out, "@ERROR: setgid failed\n");
785 #ifdef HAVE_SETGROUPS
786 /* Set the group(s) we want to be active. */
787 if (setgroups(gid_count, gid_list)) {
788 rsyserr(FLOG, errno, "setgroups failed");
789 io_printf(f_out, "@ERROR: setgroups failed\n");
793 #if defined HAVE_INITGROUPS && !defined HAVE_GETGROUPLIST
794 /* pw is set if the user wants all the user's groups. */
795 if (pw && initgroups(pw->pw_name, pw->pw_gid) < 0) {
796 rsyserr(FLOG, errno, "initgroups failed");
797 io_printf(f_out, "@ERROR: initgroups failed\n");
805 rsyserr(FLOG, errno, "setuid %ld failed", (long)uid);
806 io_printf(f_out, "@ERROR: setuid failed\n");
810 am_root = (MY_UID() == 0);
813 if (lp_temp_dir(i) && *lp_temp_dir(i)) {
814 tmpdir = lp_temp_dir(i);
815 if (strlen(tmpdir) >= MAXPATHLEN - 10) {
817 "the 'temp dir' value for %s is WAY too long -- ignoring.\n",
823 io_printf(f_out, "@RSYNCD: OK\n");
825 read_args(f_in, name, line, sizeof line, rl_nulls, &argv, &argc, &request);
828 save_munge_symlinks = munge_symlinks;
830 reset_output_levels(); /* future verbosity is controlled by client options */
831 ret = parse_arguments(&argc, (const char ***) &argv);
832 if (protect_args && ret) {
833 orig_early_argv = orig_argv;
835 read_args(f_in, name, line, sizeof line, 1, &argv, &argc, &request);
837 ret = parse_arguments(&argc, (const char ***) &argv);
839 orig_early_argv = NULL;
841 munge_symlinks = save_munge_symlinks; /* The client mustn't control this. */
844 err_msg = finish_pre_exec(pre_exec_pid, pre_exec_fd, request,
845 orig_early_argv, orig_argv);
849 free(orig_early_argv);
851 am_server = 1; /* Don't let someone try to be tricky. */
853 if (lp_ignore_errors(module_id))
858 if (lp_fake_super(i)) {
859 if (preserve_xattrs > 1)
862 } else if (am_root < 0) /* Treat --fake-super from client as --super. */
865 if (filesfrom_fd == 0)
870 rprintf(FLOG, "rsync %s %s from %s@%s (%s)\n",
871 am_sender ? "on" : "to",
872 request, auth_user, host, addr);
874 rprintf(FLOG, "rsync %s %s from %s (%s)\n",
875 am_sender ? "on" : "to",
876 request, host, addr);
882 /* don't allow the logs to be flooded too fast */
883 limit_output_verbosity(lp_max_verbosity(i));
886 if (protocol_version < 23
887 && (protocol_version == 22 || am_sender))
888 io_start_multiplex_out();
889 else if (!ret || err_msg) {
890 /* We have to get I/O multiplexing started so that we can
891 * get the error back to the client. This means getting
892 * the protocol setup finished first in later versions. */
893 setup_protocol(f_out, f_in);
895 /* Since we failed in our option parsing, we may not
896 * have finished parsing that the client sent us a
897 * --files-from option, so look for it manually.
898 * Without this, the socket would be in the wrong
899 * state for the upcoming error message. */
902 for (i = 0; i < argc; i++) {
903 if (strncmp(argv[i], "--files-from", 12) == 0) {
910 write_byte(f_out, 0);
912 io_start_multiplex_out();
915 if (!ret || err_msg) {
917 rwrite(FERROR, err_msg, strlen(err_msg), 0);
921 exit_cleanup(RERR_UNSUPPORTED);
926 if (ic_send != (iconv_t)-1) {
927 iconv_close(ic_send);
928 ic_send = (iconv_t)-1;
930 if (ic_recv != (iconv_t)-1) {
931 iconv_close(ic_recv);
932 ic_recv = (iconv_t)-1;
938 && (use_chroot ? lp_numeric_ids(i) != False : lp_numeric_ids(i) == True))
939 numeric_ids = -1; /* Set --numeric-ids w/o breaking protocol. */
941 if (lp_timeout(i) && lp_timeout(i) > io_timeout)
942 set_io_timeout(lp_timeout(i));
944 /* If we have some incoming/outgoing chmod changes, append them to
945 * any user-specified changes (making our changes have priority).
946 * We also get a pointer to just our changes so that a receiver
947 * process can use them separately if --perms wasn't specified. */
949 p = lp_outgoing_chmod(i);
951 p = lp_incoming_chmod(i);
952 if (*p && !(daemon_chmod_modes = parse_chmod(p, &chmod_modes))) {
953 rprintf(FLOG, "Invalid \"%sing chmod\" directive: %s\n",
954 am_sender ? "outgo" : "incom", p);
957 start_server(f_in, f_out, argc, argv);
962 /* send a list of available modules to the client. Don't list those
963 with "list = False". */
964 static void send_listing(int fd)
966 int n = lp_num_modules();
969 for (i = 0; i < n; i++) {
971 io_printf(fd, "%-15s\t%s\n", lp_name(i), lp_comment(i));
974 if (protocol_version >= 25)
975 io_printf(fd,"@RSYNCD: EXIT\n");
978 static int load_config(int globals_only)
981 if (am_server && am_root <= 0)
982 config_file = RSYNCD_USERCONF;
984 config_file = RSYNCD_SYSCONF;
986 return lp_load(config_file, globals_only);
989 /* this is called when a connection is established to a client
990 and we want to start talking. The setup of the system is done from
992 int start_daemon(int f_in, int f_out)
995 const char *addr, *host;
998 io_set_sock_fds(f_in, f_out);
1000 /* We must load the config file before calling any function that
1001 * might cause log-file output to occur. This ensures that the
1002 * "log file" param gets honored for the 2 non-forked use-cases
1003 * (when rsync is run by init and run by a remote shell). */
1004 if (!load_config(0))
1005 exit_cleanup(RERR_SYNTAX);
1007 addr = client_addr(f_in);
1008 host = lp_reverse_lookup(-1) ? client_name(f_in) : undetermined_hostname;
1009 rprintf(FLOG, "connect from %s (%s)\n", host, addr);
1012 set_socket_options(f_in, "SO_KEEPALIVE");
1013 set_nonblocking(f_in);
1016 if (exchange_protocols(f_in, f_out, line, sizeof line, 0) < 0)
1020 if (!read_line_old(f_in, line, sizeof line))
1023 if (!*line || strcmp(line, "#list") == 0) {
1024 rprintf(FLOG, "module-list request from %s (%s)\n",
1026 send_listing(f_out);
1031 /* it's some sort of command that I don't understand */
1032 io_printf(f_out, "@ERROR: Unknown command '%s'\n", line);
1036 if ((i = lp_number(line)) < 0) {
1037 rprintf(FLOG, "unknown module '%s' tried from %s (%s)\n",
1039 io_printf(f_out, "@ERROR: Unknown module '%s'\n", line);
1043 #ifdef HAVE_SIGACTION
1044 sigact.sa_flags = SA_NOCLDSTOP;
1046 SIGACTION(SIGCHLD, remember_children);
1048 return rsync_module(f_in, f_out, i, addr, host);
1051 static void create_pid_file(void)
1053 char *pid_file = lp_pid_file();
1055 pid_t pid = getpid();
1058 if (!pid_file || !*pid_file)
1061 cleanup_set_pid(pid);
1062 if ((fd = do_open(pid_file, O_WRONLY|O_CREAT|O_EXCL, 0666 & ~orig_umask)) == -1) {
1065 fprintf(stderr, "failed to create pid file %s: %s\n", pid_file, strerror(errno));
1066 rsyserr(FLOG, errno, "failed to create pid file %s", pid_file);
1067 exit_cleanup(RERR_FILEIO);
1069 snprintf(pidbuf, sizeof pidbuf, "%ld\n", (long)pid);
1070 len = strlen(pidbuf);
1071 if (write(fd, pidbuf, len) != len)
1076 /* Become a daemon, discarding the controlling terminal. */
1077 static void become_daemon(void)
1084 fprintf(stderr, "failed to fork: %s\n", strerror(errno));
1085 exit_cleanup(RERR_FILEIO);
1092 /* detach from the terminal */
1095 #elif defined TIOCNOTTY
1096 i = open("/dev/tty", O_RDWR);
1098 ioctl(i, (int)TIOCNOTTY, (char *)0);
1102 /* make sure that stdin, stdout an stderr don't stuff things
1103 * up (library functions, for example) */
1104 for (i = 0; i < 3; i++) {
1106 open("/dev/null", O_RDWR);
1110 int daemon_main(void)
1112 if (is_a_socket(STDIN_FILENO)) {
1115 /* we are running via inetd - close off stdout and
1116 * stderr so that library functions (and getopt) don't
1117 * try to use them. Redirect them to /dev/null */
1118 for (i = 1; i < 3; i++) {
1120 open("/dev/null", O_RDWR);
1123 return start_daemon(STDIN_FILENO, STDIN_FILENO);
1126 if (!load_config(1)) {
1127 fprintf(stderr, "Failed to parse config file: %s\n", config_file);
1128 exit_cleanup(RERR_SYNTAX);
1137 if (rsync_port == 0 && (rsync_port = lp_rsync_port()) == 0)
1138 rsync_port = RSYNC_PORT;
1139 if (bind_address == NULL && *lp_bind_address())
1140 bind_address = lp_bind_address();
1144 rprintf(FLOG, "rsyncd version %s starting, listening on port %d\n",
1145 RSYNC_VERSION, rsync_port);
1146 /* TODO: If listening on a particular address, then show that
1147 * address too. In fact, why not just do inet_ntop on the
1148 * local address??? */
1150 start_accept_loop(rsync_port, start_daemon);