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)) {
420 if (!isDigit(gname)) {
421 rprintf(FLOG, "Invalid gid %s\n", gname);
422 io_printf(f_out, "@ERROR: invalid gid %s\n", gname);
427 if (gid_count == MAX_GID_LIST) {
428 rprintf(FLOG, "Too many groups specified via gid parameter.\n");
429 io_printf(f_out, "@ERROR: too many groups\n");
432 gid_list[gid_count++] = gid;
436 static struct passwd *want_all_groups(int f_out, uid_t uid)
438 #if defined HAVE_GETGROUPLIST || defined HAVE_INITGROUPS
440 if ((pw = getpwuid(uid)) == NULL) {
441 rsyserr(FLOG, errno, "getpwuid failed");
442 io_printf(f_out, "@ERROR: getpwuid failed\n");
445 # ifdef HAVE_GETGROUPLIST
446 /* Get all the process's groups, with the pw_gid group first. */
447 gid_count = MAX_GID_LIST;
448 if (getgrouplist(pw->pw_name, pw->pw_gid, gid_list, &gid_count) < 0) {
449 rsyserr(FLOG, errno, "getgrouplist failed");
450 io_printf(f_out, "@ERROR: getgrouplist failed\n");
453 /* Paranoia: is the default group not first in the list? */
454 if (gid_list[0] != pw->pw_gid) {
456 for (j = 0; j < gid_count; j++) {
457 if (gid_list[j] == pw->pw_gid) {
458 gid_list[j] = gid_list[0];
459 gid_list[0] = pw->pw_gid;
465 /* Start with the default group and initgroups() will add the reset. */
467 gid_list[0] = pw->pw_gid;
471 rprintf(FLOG, "This rsync does not support a gid of \"*\"\n");
472 io_printf(f_out, "@ERROR: invalid gid setting.\n");
477 static int rsync_module(int f_in, int f_out, int i, const char *addr, const char *host)
480 char **argv, **orig_argv, **orig_early_argv, *module_chdir;
481 char line[BIGPATHBUFLEN];
482 struct passwd *pw = NULL;
485 char *p, *err_msg = NULL;
486 char *name = lp_name(i);
487 int use_chroot = lp_use_chroot(i);
488 int ret, pre_exec_fd = -1;
489 int save_munge_symlinks;
490 pid_t pre_exec_pid = 0;
491 char *request = NULL;
494 iconv_opt = lp_charset(i);
500 /* If reverse lookup is disabled globally but enabled for this module,
501 * we need to do it now before the access check. */
502 if (host == undetermined_hostname && lp_reverse_lookup(i))
503 host = client_name(f_in);
505 if (!allow_access(addr, host, lp_hosts_allow(i), lp_hosts_deny(i))) {
506 rprintf(FLOG, "rsync denied on module %s from %s (%s)\n",
509 io_printf(f_out, "@ERROR: Unknown module '%s'\n", name);
512 "@ERROR: access denied to %s from %s (%s)\n",
518 if (am_daemon && am_server) {
519 rprintf(FLOG, "rsync allowed access on module %s from %s (%s)\n",
523 if (!claim_connection(lp_lock_file(i), lp_max_connections(i))) {
525 rsyserr(FLOG, errno, "failed to open lock file %s",
527 io_printf(f_out, "@ERROR: failed to open lock file\n");
529 rprintf(FLOG, "max connections (%d) reached\n",
530 lp_max_connections(i));
531 io_printf(f_out, "@ERROR: max connections (%d) reached -- try again later\n",
532 lp_max_connections(i));
537 auth_user = auth_server(f_in, f_out, i, host, addr, "@RSYNCD: AUTHREQD ");
540 io_printf(f_out, "@ERROR: auth failed on module %s\n", name);
549 if (lp_transfer_logging(i) && !logfile_format)
550 logfile_format = lp_log_format(i);
551 if (log_format_has(logfile_format, 'i'))
552 logfile_format_has_i = 1;
553 if (logfile_format_has_i || log_format_has(logfile_format, 'o'))
554 logfile_format_has_o_or_i = 1;
557 am_root = (uid == 0);
559 p = *lp_uid(i) ? lp_uid(i) : am_root ? NOBODY_USER : NULL;
561 if (!name_to_uid(p, &uid)) {
563 rprintf(FLOG, "Invalid uid %s\n", p);
564 io_printf(f_out, "@ERROR: invalid uid %s\n", p);
573 p = *lp_gid(i) ? strtok(lp_gid(i), ", ") : NULL;
575 /* The "*" gid must be the first item in the list. */
576 if (strcmp(p, "*") == 0) {
577 if ((pw = want_all_groups(f_out, uid)) == NULL)
579 } else if (add_a_group(f_out, p) < 0)
581 while ((p = strtok(NULL, ", ")) != NULL) {
582 #if defined HAVE_INITGROUPS && !defined HAVE_GETGROUPLIST
584 rprintf(FLOG, "This rsync cannot add groups after \"*\".\n");
585 io_printf(f_out, "@ERROR: invalid gid setting.\n");
589 if (add_a_group(f_out, p) < 0)
592 } else if (am_root) {
593 if (add_a_group(f_out, NOBODY_GROUP) < 0)
597 module_dir = lp_path(i);
599 if ((p = strstr(module_dir, "/./")) != NULL) {
600 *p = '\0'; /* Temporary... */
601 if (!(module_chdir = normalize_path(module_dir, True, NULL)))
602 return path_failure(f_out, module_dir, False);
604 if (!(p = normalize_path(p + 2, True, &module_dirlen)))
605 return path_failure(f_out, strstr(module_dir, "/./"), False);
606 if (!(full_module_path = normalize_path(module_dir, False, NULL)))
607 full_module_path = module_dir;
610 if (!(module_chdir = normalize_path(module_dir, False, NULL)))
611 return path_failure(f_out, module_dir, False);
612 full_module_path = module_chdir;
617 if (!(module_chdir = normalize_path(module_dir, False, &module_dirlen)))
618 return path_failure(f_out, module_dir, False);
619 full_module_path = module_dir = module_chdir;
622 if (module_dirlen == 1) {
624 set_filter_dir("/", 1);
626 set_filter_dir(module_dir, module_dirlen);
629 parse_rule(&daemon_filter_list, p, MATCHFLG_WORD_SPLIT,
630 XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3);
632 p = lp_include_from(i);
633 parse_filter_file(&daemon_filter_list, p, MATCHFLG_INCLUDE,
634 XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3 | XFLG_OLD_PREFIXES | XFLG_FATAL_ERRORS);
637 parse_rule(&daemon_filter_list, p,
638 MATCHFLG_INCLUDE | MATCHFLG_WORD_SPLIT,
639 XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3 | XFLG_OLD_PREFIXES);
641 p = lp_exclude_from(i);
642 parse_filter_file(&daemon_filter_list, p, 0,
643 XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3 | XFLG_OLD_PREFIXES | XFLG_FATAL_ERRORS);
646 parse_rule(&daemon_filter_list, p, MATCHFLG_WORD_SPLIT,
647 XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3 | XFLG_OLD_PREFIXES);
652 if (*lp_prexfer_exec(i) || *lp_postxfer_exec(i)) {
653 char *modname, *modpath, *hostaddr, *hostname, *username;
656 if (asprintf(&modname, "RSYNC_MODULE_NAME=%s", name) < 0
657 || asprintf(&modpath, "RSYNC_MODULE_PATH=%s", full_module_path) < 0
658 || asprintf(&hostaddr, "RSYNC_HOST_ADDR=%s", addr) < 0
659 || asprintf(&hostname, "RSYNC_HOST_NAME=%s", host) < 0
660 || asprintf(&username, "RSYNC_USER_NAME=%s", auth_user) < 0)
661 out_of_memory("rsync_module");
668 /* For post-xfer exec, fork a new process to run the rsync
669 * daemon while this process waits for the exit status and
670 * runs the indicated command at that point. */
671 if (*lp_postxfer_exec(i)) {
674 rsyserr(FLOG, errno, "fork failed");
675 io_printf(f_out, "@ERROR: fork failed\n");
679 if (asprintf(&p, "RSYNC_PID=%ld", (long)pid) > 0)
681 if (wait_process(pid, &status, 0) < 0)
683 if (asprintf(&p, "RSYNC_RAW_STATUS=%d", status) > 0)
685 if (WIFEXITED(status))
686 status = WEXITSTATUS(status);
689 if (asprintf(&p, "RSYNC_EXIT_STATUS=%d", status) > 0)
691 if (system(lp_postxfer_exec(i)) < 0)
696 /* For pre-xfer exec, fork a child process to run the indicated
697 * command, though it first waits for the parent process to
698 * send us the user's request via a pipe. */
699 if (*lp_prexfer_exec(i)) {
701 if (asprintf(&p, "RSYNC_PID=%ld", (long)getpid()) > 0)
703 if (pipe(fds) < 0 || (pre_exec_pid = fork()) < 0) {
704 rsyserr(FLOG, errno, "pre-xfer exec preparation failed");
705 io_printf(f_out, "@ERROR: pre-xfer exec preparation failed\n");
708 if (pre_exec_pid == 0) {
709 char buf[BIGPATHBUFLEN];
712 set_blocking(fds[0]);
713 len = read_arg_from_pipe(fds[0], buf, BIGPATHBUFLEN);
716 if (asprintf(&p, "RSYNC_REQUEST=%s", buf) > 0)
719 len = read_arg_from_pipe(fds[0], buf,
726 if (asprintf(&p, "RSYNC_ARG%d=%s", j, buf) > 0)
731 close(STDOUT_FILENO);
732 status = system(lp_prexfer_exec(i));
733 if (!WIFEXITED(status))
735 _exit(WEXITSTATUS(status));
738 set_blocking(fds[1]);
739 pre_exec_fd = fds[1];
747 * XXX: The 'use chroot' flag is a fairly reliable
748 * source of confusion, because it fails under two
749 * important circumstances: running as non-root,
750 * running on Win32 (or possibly others). On the
751 * other hand, if you are running as root, then it
752 * might be better to always use chroot.
754 * So, perhaps if we can't chroot we should just issue
755 * a warning, unless a "require chroot" flag is set,
756 * in which case we fail.
758 if (chroot(module_chdir)) {
759 rsyserr(FLOG, errno, "chroot %s failed", module_chdir);
760 io_printf(f_out, "@ERROR: chroot failed\n");
763 module_chdir = module_dir;
766 if (!change_dir(module_chdir, CD_NORMAL))
767 return path_failure(f_out, module_chdir, True);
768 if (module_dirlen || !use_chroot)
771 if ((munge_symlinks = lp_munge_symlinks(i)) < 0)
772 munge_symlinks = !use_chroot || module_dirlen;
773 if (munge_symlinks) {
775 char prefix[SYMLINK_PREFIX_LEN]; /* NOT +1 ! */
776 strlcpy(prefix, SYMLINK_PREFIX, sizeof prefix); /* trim the trailing slash */
777 if (do_stat(prefix, &st) == 0 && S_ISDIR(st.st_mode)) {
778 rprintf(FLOG, "Symlink munging is unsafe when a %s directory exists.\n",
780 io_printf(f_out, "@ERROR: daemon security issue -- contact admin\n", name);
781 exit_cleanup(RERR_UNSUPPORTED);
786 if (setgid(gid_list[0])) {
787 rsyserr(FLOG, errno, "setgid %ld failed", (long)gid_list[0]);
788 io_printf(f_out, "@ERROR: setgid failed\n");
791 #ifdef HAVE_SETGROUPS
792 /* Set the group(s) we want to be active. */
793 if (setgroups(gid_count, gid_list)) {
794 rsyserr(FLOG, errno, "setgroups failed");
795 io_printf(f_out, "@ERROR: setgroups failed\n");
799 #if defined HAVE_INITGROUPS && !defined HAVE_GETGROUPLIST
800 /* pw is set if the user wants all the user's groups. */
801 if (pw && initgroups(pw->pw_name, pw->pw_gid) < 0) {
802 rsyserr(FLOG, errno, "initgroups failed");
803 io_printf(f_out, "@ERROR: initgroups failed\n");
811 rsyserr(FLOG, errno, "setuid %ld failed", (long)uid);
812 io_printf(f_out, "@ERROR: setuid failed\n");
816 am_root = (MY_UID() == 0);
819 if (lp_temp_dir(i) && *lp_temp_dir(i)) {
820 tmpdir = lp_temp_dir(i);
821 if (strlen(tmpdir) >= MAXPATHLEN - 10) {
823 "the 'temp dir' value for %s is WAY too long -- ignoring.\n",
829 io_printf(f_out, "@RSYNCD: OK\n");
831 read_args(f_in, name, line, sizeof line, rl_nulls, &argv, &argc, &request);
834 save_munge_symlinks = munge_symlinks;
836 reset_output_levels(); /* future verbosity is controlled by client options */
837 ret = parse_arguments(&argc, (const char ***) &argv);
838 if (protect_args && ret) {
839 orig_early_argv = orig_argv;
841 read_args(f_in, name, line, sizeof line, 1, &argv, &argc, &request);
843 ret = parse_arguments(&argc, (const char ***) &argv);
845 orig_early_argv = NULL;
847 munge_symlinks = save_munge_symlinks; /* The client mustn't control this. */
850 err_msg = finish_pre_exec(pre_exec_pid, pre_exec_fd, request,
851 orig_early_argv, orig_argv);
855 free(orig_early_argv);
857 am_server = 1; /* Don't let someone try to be tricky. */
859 if (lp_ignore_errors(module_id))
864 if (lp_fake_super(i)) {
865 if (preserve_xattrs > 1)
868 } else if (am_root < 0) /* Treat --fake-super from client as --super. */
871 if (filesfrom_fd == 0)
876 rprintf(FLOG, "rsync %s %s from %s@%s (%s)\n",
877 am_sender ? "on" : "to",
878 request, auth_user, host, addr);
880 rprintf(FLOG, "rsync %s %s from %s (%s)\n",
881 am_sender ? "on" : "to",
882 request, host, addr);
888 /* don't allow the logs to be flooded too fast */
889 limit_output_verbosity(lp_max_verbosity(i));
892 if (protocol_version < 23
893 && (protocol_version == 22 || am_sender))
894 io_start_multiplex_out();
895 else if (!ret || err_msg) {
896 /* We have to get I/O multiplexing started so that we can
897 * get the error back to the client. This means getting
898 * the protocol setup finished first in later versions. */
899 setup_protocol(f_out, f_in);
901 /* Since we failed in our option parsing, we may not
902 * have finished parsing that the client sent us a
903 * --files-from option, so look for it manually.
904 * Without this, the socket would be in the wrong
905 * state for the upcoming error message. */
908 for (i = 0; i < argc; i++) {
909 if (strncmp(argv[i], "--files-from", 12) == 0) {
916 write_byte(f_out, 0);
918 io_start_multiplex_out();
921 if (!ret || err_msg) {
923 rwrite(FERROR, err_msg, strlen(err_msg), 0);
927 exit_cleanup(RERR_UNSUPPORTED);
932 if (ic_send != (iconv_t)-1) {
933 iconv_close(ic_send);
934 ic_send = (iconv_t)-1;
936 if (ic_recv != (iconv_t)-1) {
937 iconv_close(ic_recv);
938 ic_recv = (iconv_t)-1;
944 && (use_chroot ? lp_numeric_ids(i) != False : lp_numeric_ids(i) == True))
945 numeric_ids = -1; /* Set --numeric-ids w/o breaking protocol. */
947 if (lp_timeout(i) && lp_timeout(i) > io_timeout)
948 set_io_timeout(lp_timeout(i));
950 /* If we have some incoming/outgoing chmod changes, append them to
951 * any user-specified changes (making our changes have priority).
952 * We also get a pointer to just our changes so that a receiver
953 * process can use them separately if --perms wasn't specified. */
955 p = lp_outgoing_chmod(i);
957 p = lp_incoming_chmod(i);
958 if (*p && !(daemon_chmod_modes = parse_chmod(p, &chmod_modes))) {
959 rprintf(FLOG, "Invalid \"%sing chmod\" directive: %s\n",
960 am_sender ? "outgo" : "incom", p);
963 start_server(f_in, f_out, argc, argv);
968 /* send a list of available modules to the client. Don't list those
969 with "list = False". */
970 static void send_listing(int fd)
972 int n = lp_num_modules();
975 for (i = 0; i < n; i++) {
977 io_printf(fd, "%-15s\t%s\n", lp_name(i), lp_comment(i));
980 if (protocol_version >= 25)
981 io_printf(fd,"@RSYNCD: EXIT\n");
984 static int load_config(int globals_only)
987 if (am_server && am_root <= 0)
988 config_file = RSYNCD_USERCONF;
990 config_file = RSYNCD_SYSCONF;
992 return lp_load(config_file, globals_only);
995 /* this is called when a connection is established to a client
996 and we want to start talking. The setup of the system is done from
998 int start_daemon(int f_in, int f_out)
1001 const char *addr, *host;
1004 io_set_sock_fds(f_in, f_out);
1006 /* We must load the config file before calling any function that
1007 * might cause log-file output to occur. This ensures that the
1008 * "log file" param gets honored for the 2 non-forked use-cases
1009 * (when rsync is run by init and run by a remote shell). */
1010 if (!load_config(0))
1011 exit_cleanup(RERR_SYNTAX);
1013 addr = client_addr(f_in);
1014 host = lp_reverse_lookup(-1) ? client_name(f_in) : undetermined_hostname;
1015 rprintf(FLOG, "connect from %s (%s)\n", host, addr);
1018 set_socket_options(f_in, "SO_KEEPALIVE");
1019 set_nonblocking(f_in);
1022 if (exchange_protocols(f_in, f_out, line, sizeof line, 0) < 0)
1026 if (!read_line_old(f_in, line, sizeof line))
1029 if (!*line || strcmp(line, "#list") == 0) {
1030 rprintf(FLOG, "module-list request from %s (%s)\n",
1032 send_listing(f_out);
1037 /* it's some sort of command that I don't understand */
1038 io_printf(f_out, "@ERROR: Unknown command '%s'\n", line);
1042 if ((i = lp_number(line)) < 0) {
1043 rprintf(FLOG, "unknown module '%s' tried from %s (%s)\n",
1045 io_printf(f_out, "@ERROR: Unknown module '%s'\n", line);
1049 #ifdef HAVE_SIGACTION
1050 sigact.sa_flags = SA_NOCLDSTOP;
1052 SIGACTION(SIGCHLD, remember_children);
1054 return rsync_module(f_in, f_out, i, addr, host);
1057 static void create_pid_file(void)
1059 char *pid_file = lp_pid_file();
1061 pid_t pid = getpid();
1064 if (!pid_file || !*pid_file)
1067 cleanup_set_pid(pid);
1068 if ((fd = do_open(pid_file, O_WRONLY|O_CREAT|O_EXCL, 0666 & ~orig_umask)) == -1) {
1071 fprintf(stderr, "failed to create pid file %s: %s\n", pid_file, strerror(errno));
1072 rsyserr(FLOG, errno, "failed to create pid file %s", pid_file);
1073 exit_cleanup(RERR_FILEIO);
1075 snprintf(pidbuf, sizeof pidbuf, "%ld\n", (long)pid);
1076 len = strlen(pidbuf);
1077 if (write(fd, pidbuf, len) != len)
1082 /* Become a daemon, discarding the controlling terminal. */
1083 static void become_daemon(void)
1090 fprintf(stderr, "failed to fork: %s\n", strerror(errno));
1091 exit_cleanup(RERR_FILEIO);
1098 /* detach from the terminal */
1101 #elif defined TIOCNOTTY
1102 i = open("/dev/tty", O_RDWR);
1104 ioctl(i, (int)TIOCNOTTY, (char *)0);
1108 /* make sure that stdin, stdout an stderr don't stuff things
1109 * up (library functions, for example) */
1110 for (i = 0; i < 3; i++) {
1112 open("/dev/null", O_RDWR);
1116 int daemon_main(void)
1118 if (is_a_socket(STDIN_FILENO)) {
1121 /* we are running via inetd - close off stdout and
1122 * stderr so that library functions (and getopt) don't
1123 * try to use them. Redirect them to /dev/null */
1124 for (i = 1; i < 3; i++) {
1126 open("/dev/null", O_RDWR);
1129 return start_daemon(STDIN_FILENO, STDIN_FILENO);
1132 if (!load_config(1)) {
1133 fprintf(stderr, "Failed to parse config file: %s\n", config_file);
1134 exit_cleanup(RERR_SYNTAX);
1143 if (rsync_port == 0 && (rsync_port = lp_rsync_port()) == 0)
1144 rsync_port = RSYNC_PORT;
1145 if (bind_address == NULL && *lp_bind_address())
1146 bind_address = lp_bind_address();
1150 rprintf(FLOG, "rsyncd version %s starting, listening on port %d\n",
1151 RSYNC_VERSION, rsync_port);
1152 /* TODO: If listening on a particular address, then show that
1153 * address too. In fact, why not just do inet_ntop on the
1154 * local address??? */
1156 start_accept_loop(rsync_port, start_daemon);