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/" */
268 else if (**argv == '-') {
269 if (asprintf(sargs + sargc++, "./%s", *argv) < 0)
270 out_of_memory("start_inband_exchange");
272 sargs[sargc++] = *argv;
279 if (DEBUG_GTE(CMD, 1))
280 print_child_argv("sending daemon args:", sargs);
282 io_printf(f_out, "%.*s\n", modlen, modname);
284 /* Old servers may just drop the connection here,
285 rather than sending a proper EXIT command. Yuck. */
286 kluge_around_eof = list_only && protocol_version < 25 ? 1 : 0;
289 if (!read_line_old(f_in, line, sizeof line, 0)) {
290 rprintf(FERROR, "rsync: didn't get server startup line\n");
294 if (strncmp(line,"@RSYNCD: AUTHREQD ",18) == 0) {
295 auth_client(f_out, user, line+18);
299 if (strcmp(line,"@RSYNCD: OK") == 0)
302 if (strcmp(line,"@RSYNCD: EXIT") == 0) {
303 /* This is sent by recent versions of the
304 * server to terminate the listing of modules.
305 * We don't want to go on and transfer
306 * anything; just exit. */
310 if (strncmp(line, "@ERROR", 6) == 0) {
311 rprintf(FERROR, "%s\n", line);
312 /* This is always fatal; the server will now
313 * close the socket. */
317 /* This might be a MOTD line or a module listing, but there is
318 * no way to differentiate it. The manpage mentions this. */
320 rprintf(FINFO, "%s\n", line);
322 kluge_around_eof = 0;
325 for (i = 0; i < sargc; i++) {
326 if (!sargs[i]) /* stop at --protect-args NULL */
328 write_sbuf(f_out, sargs[i]);
329 write_byte(f_out, 0);
331 write_byte(f_out, 0);
333 for (i = 0; i < sargc; i++)
334 io_printf(f_out, "%s\n", sargs[i]);
335 write_sbuf(f_out, "\n");
339 send_protected_args(f_out, sargs);
341 if (protocol_version < 23) {
342 if (protocol_version == 22 || !am_sender)
343 io_start_multiplex_in(f_in);
351 static char *finish_pre_exec(pid_t pid, int fd, char *request,
352 char **early_argv, char **argv)
354 int j = 0, status = -1;
359 write_buf(fd, request, strlen(request)+1);
361 for ( ; *early_argv; early_argv++)
362 write_buf(fd, *early_argv, strlen(*early_argv)+1);
363 j = 1; /* Skip arg0 name in argv. */
365 for ( ; argv[j]; j++) {
366 write_buf(fd, argv[j], strlen(argv[j])+1);
367 if (argv[j][0] == '.' && argv[j][1] == '\0')
374 if (wait_process(pid, &status, 0) < 0
375 || !WIFEXITED(status) || WEXITSTATUS(status) != 0) {
377 if (asprintf(&e, "pre-xfer exec returned failure (%d)%s%s\n",
378 status, status < 0 ? ": " : "",
379 status < 0 ? strerror(errno) : "") < 0)
380 out_of_memory("finish_pre_exec");
387 static int read_arg_from_pipe(int fd, char *buf, int limit)
389 char *bp = buf, *eob = buf + limit - 1;
392 int got = read(fd, bp, 1);
394 if (got < 0 && errno == EINTR)
409 static int path_failure(int f_out, const char *dir, BOOL was_chdir)
412 rsyserr(FLOG, errno, "chdir %s failed\n", dir);
414 rprintf(FLOG, "normalize_path(%s) failed\n", dir);
415 io_printf(f_out, "@ERROR: chdir failed\n");
419 static int add_a_group(int f_out, const char *gname)
422 if (!group_to_gid(gname, &gid, True)) {
423 rprintf(FLOG, "Invalid gid %s\n", gname);
424 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 #ifdef HAVE_GETGROUPLIST
437 static int want_all_groups(int f_out, uid_t uid)
440 gid_count = MAX_GID_LIST;
441 if ((err = getallgroups(uid, gid_list, &gid_count)) != NULL) {
442 rsyserr(FLOG, errno, "%s", err);
443 io_printf(f_out, "@ERROR: %s\n", err);
448 #elif defined HAVE_INITGROUPS
449 static struct passwd *want_all_groups(int f_out, uid_t uid)
452 if ((pw = getpwuid(uid)) == NULL) {
453 rsyserr(FLOG, errno, "getpwuid failed");
454 io_printf(f_out, "@ERROR: getpwuid failed\n");
457 /* Start with the default group and initgroups() will add the reset. */
459 gid_list[0] = pw->pw_gid;
464 static void set_env_str(const char *var, const char *str)
468 if (asprintf(&mem, "%s=%s", var, str) < 0)
469 out_of_memory("set_env_str");
475 static void set_env_num(const char *var, long num)
478 if (asprintf(&mem, "%s=%ld", var, num) < 0)
479 out_of_memory("set_env_num");
484 static int rsync_module(int f_in, int f_out, int i, const char *addr, const char *host)
487 char **argv, **orig_argv, **orig_early_argv, *module_chdir;
488 char line[BIGPATHBUFLEN];
489 #if defined HAVE_INITGROUPS && !defined HAVE_GETGROUPLIST
490 struct passwd *pw = NULL;
494 char *p, *err_msg = NULL;
495 char *name = lp_name(i);
496 int use_chroot = lp_use_chroot(i);
497 int ret, pre_exec_fd = -1;
498 int save_munge_symlinks;
499 pid_t pre_exec_pid = 0;
500 char *request = NULL;
502 set_env_str("RSYNC_MODULE_NAME", name);
505 iconv_opt = lp_charset(i);
511 /* If reverse lookup is disabled globally but enabled for this module,
512 * we need to do it now before the access check. */
513 if (host == undetermined_hostname && lp_reverse_lookup(i))
514 host = client_name(f_in);
515 set_env_str("RSYNC_HOST_NAME", host);
516 set_env_str("RSYNC_HOST_ADDR", addr);
518 if (!allow_access(addr, &host, i)) {
519 rprintf(FLOG, "rsync denied on module %s from %s (%s)\n",
522 io_printf(f_out, "@ERROR: Unknown module '%s'\n", name);
525 "@ERROR: access denied to %s from %s (%s)\n",
531 if (am_daemon && am_server) {
532 rprintf(FLOG, "rsync allowed access on module %s from %s (%s)\n",
536 if (!claim_connection(lp_lock_file(i), lp_max_connections(i))) {
538 rsyserr(FLOG, errno, "failed to open lock file %s",
540 io_printf(f_out, "@ERROR: failed to open lock file\n");
542 rprintf(FLOG, "max connections (%d) reached\n",
543 lp_max_connections(i));
544 io_printf(f_out, "@ERROR: max connections (%d) reached -- try again later\n",
545 lp_max_connections(i));
550 read_only = lp_read_only(i); /* may also be overridden by auth_server() */
551 auth_user = auth_server(f_in, f_out, i, host, addr, "@RSYNCD: AUTHREQD ");
554 io_printf(f_out, "@ERROR: auth failed on module %s\n", name);
557 set_env_str("RSYNC_USER_NAME", auth_user);
561 if (lp_transfer_logging(i) && !logfile_format)
562 logfile_format = lp_log_format(i);
563 if (log_format_has(logfile_format, 'i'))
564 logfile_format_has_i = 1;
565 if (logfile_format_has_i || log_format_has(logfile_format, 'o'))
566 logfile_format_has_o_or_i = 1;
569 am_root = (uid == 0);
571 p = *lp_uid(i) ? lp_uid(i) : am_root ? NOBODY_USER : NULL;
573 if (!user_to_uid(p, &uid, True)) {
574 rprintf(FLOG, "Invalid uid %s\n", p);
575 io_printf(f_out, "@ERROR: invalid uid %s\n", p);
582 p = *lp_gid(i) ? strtok(lp_gid(i), ", ") : NULL;
584 /* The "*" gid must be the first item in the list. */
585 if (strcmp(p, "*") == 0) {
586 #ifdef HAVE_GETGROUPLIST
587 if (want_all_groups(f_out, uid) < 0)
589 #elif defined HAVE_INITGROUPS
590 if ((pw = want_all_groups(f_out, uid)) == NULL)
593 rprintf(FLOG, "This rsync does not support a gid of \"*\"\n");
594 io_printf(f_out, "@ERROR: invalid gid setting.\n");
597 } else if (add_a_group(f_out, p) < 0)
599 while ((p = strtok(NULL, ", ")) != NULL) {
600 #if defined HAVE_INITGROUPS && !defined HAVE_GETGROUPLIST
602 rprintf(FLOG, "This rsync cannot add groups after \"*\".\n");
603 io_printf(f_out, "@ERROR: invalid gid setting.\n");
607 if (add_a_group(f_out, p) < 0)
610 } else if (am_root) {
611 if (add_a_group(f_out, NOBODY_GROUP) < 0)
615 module_dir = lp_path(i);
616 if (*module_dir == '\0') {
617 rprintf(FLOG, "No path specified for module %s\n", name);
618 io_printf(f_out, "@ERROR: no path setting.\n");
622 if ((p = strstr(module_dir, "/./")) != NULL) {
623 *p = '\0'; /* Temporary... */
624 if (!(module_chdir = normalize_path(module_dir, True, NULL)))
625 return path_failure(f_out, module_dir, False);
627 if (!(p = normalize_path(p + 2, True, &module_dirlen)))
628 return path_failure(f_out, strstr(module_dir, "/./"), False);
629 if (!(full_module_path = normalize_path(module_dir, False, NULL)))
630 full_module_path = module_dir;
633 if (!(module_chdir = normalize_path(module_dir, False, NULL)))
634 return path_failure(f_out, module_dir, False);
635 full_module_path = module_chdir;
640 if (!(module_chdir = normalize_path(module_dir, False, &module_dirlen)))
641 return path_failure(f_out, module_dir, False);
642 full_module_path = module_dir = module_chdir;
644 set_env_str("RSYNC_MODULE_PATH", full_module_path);
646 if (module_dirlen == 1) {
648 set_filter_dir("/", 1);
650 set_filter_dir(module_dir, module_dirlen);
653 parse_filter_str(&daemon_filter_list, p, rule_template(FILTRULE_WORD_SPLIT),
654 XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3);
656 p = lp_include_from(i);
657 parse_filter_file(&daemon_filter_list, p, rule_template(FILTRULE_INCLUDE),
658 XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3 | XFLG_OLD_PREFIXES | XFLG_FATAL_ERRORS);
661 parse_filter_str(&daemon_filter_list, p,
662 rule_template(FILTRULE_INCLUDE | FILTRULE_WORD_SPLIT),
663 XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3 | XFLG_OLD_PREFIXES);
665 p = lp_exclude_from(i);
666 parse_filter_file(&daemon_filter_list, p, rule_template(0),
667 XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3 | XFLG_OLD_PREFIXES | XFLG_FATAL_ERRORS);
670 parse_filter_str(&daemon_filter_list, p, rule_template(FILTRULE_WORD_SPLIT),
671 XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3 | XFLG_OLD_PREFIXES);
676 if (*lp_prexfer_exec(i) || *lp_postxfer_exec(i)) {
679 /* For post-xfer exec, fork a new process to run the rsync
680 * daemon while this process waits for the exit status and
681 * runs the indicated command at that point. */
682 if (*lp_postxfer_exec(i)) {
685 rsyserr(FLOG, errno, "fork failed");
686 io_printf(f_out, "@ERROR: fork failed\n");
693 set_env_num("RSYNC_PID", (long)pid);
694 if (wait_process(pid, &status, 0) < 0)
696 set_env_num("RSYNC_RAW_STATUS", status);
697 if (WIFEXITED(status))
698 status = WEXITSTATUS(status);
701 set_env_num("RSYNC_EXIT_STATUS", status);
702 if (system(lp_postxfer_exec(i)) < 0)
707 /* For pre-xfer exec, fork a child process to run the indicated
708 * command, though it first waits for the parent process to
709 * send us the user's request via a pipe. */
710 if (*lp_prexfer_exec(i)) {
712 set_env_num("RSYNC_PID", (long)getpid());
713 if (pipe(fds) < 0 || (pre_exec_pid = fork()) < 0) {
714 rsyserr(FLOG, errno, "pre-xfer exec preparation failed");
715 io_printf(f_out, "@ERROR: pre-xfer exec preparation failed\n");
718 if (pre_exec_pid == 0) {
719 char buf[BIGPATHBUFLEN];
722 set_blocking(fds[0]);
723 len = read_arg_from_pipe(fds[0], buf, BIGPATHBUFLEN);
726 set_env_str("RSYNC_REQUEST", buf);
728 len = read_arg_from_pipe(fds[0], buf,
735 if (asprintf(&p, "RSYNC_ARG%d=%s", j, buf) > 0)
740 close(STDOUT_FILENO);
741 status = system(lp_prexfer_exec(i));
742 if (!WIFEXITED(status))
744 _exit(WEXITSTATUS(status));
747 set_blocking(fds[1]);
748 pre_exec_fd = fds[1];
755 * XXX: The 'use chroot' flag is a fairly reliable
756 * source of confusion, because it fails under two
757 * important circumstances: running as non-root,
758 * running on Win32 (or possibly others). On the
759 * other hand, if you are running as root, then it
760 * might be better to always use chroot.
762 * So, perhaps if we can't chroot we should just issue
763 * a warning, unless a "require chroot" flag is set,
764 * in which case we fail.
766 if (chroot(module_chdir)) {
767 rsyserr(FLOG, errno, "chroot %s failed", module_chdir);
768 io_printf(f_out, "@ERROR: chroot failed\n");
771 module_chdir = module_dir;
774 if (!change_dir(module_chdir, CD_NORMAL))
775 return path_failure(f_out, module_chdir, True);
776 if (module_dirlen || !use_chroot)
779 if ((munge_symlinks = lp_munge_symlinks(i)) < 0)
780 munge_symlinks = !use_chroot || module_dirlen;
781 if (munge_symlinks) {
783 char prefix[SYMLINK_PREFIX_LEN]; /* NOT +1 ! */
784 strlcpy(prefix, SYMLINK_PREFIX, sizeof prefix); /* trim the trailing slash */
785 if (do_stat(prefix, &st) == 0 && S_ISDIR(st.st_mode)) {
786 rprintf(FLOG, "Symlink munging is unsafe when a %s directory exists.\n",
788 io_printf(f_out, "@ERROR: daemon security issue -- contact admin\n", name);
789 exit_cleanup(RERR_UNSUPPORTED);
794 if (setgid(gid_list[0])) {
795 rsyserr(FLOG, errno, "setgid %ld failed", (long)gid_list[0]);
796 io_printf(f_out, "@ERROR: setgid failed\n");
799 #ifdef HAVE_SETGROUPS
800 /* Set the group(s) we want to be active. */
801 if (setgroups(gid_count, gid_list)) {
802 rsyserr(FLOG, errno, "setgroups failed");
803 io_printf(f_out, "@ERROR: setgroups failed\n");
807 #if defined HAVE_INITGROUPS && !defined HAVE_GETGROUPLIST
808 /* pw is set if the user wants all the user's groups. */
809 if (pw && initgroups(pw->pw_name, pw->pw_gid) < 0) {
810 rsyserr(FLOG, errno, "initgroups failed");
811 io_printf(f_out, "@ERROR: initgroups failed\n");
823 rsyserr(FLOG, errno, "setuid %ld failed", (long)uid);
824 io_printf(f_out, "@ERROR: setuid failed\n");
828 am_root = (MY_UID() == 0);
831 if (lp_temp_dir(i) && *lp_temp_dir(i)) {
832 tmpdir = lp_temp_dir(i);
833 if (strlen(tmpdir) >= MAXPATHLEN - 10) {
835 "the 'temp dir' value for %s is WAY too long -- ignoring.\n",
841 io_printf(f_out, "@RSYNCD: OK\n");
843 read_args(f_in, name, line, sizeof line, rl_nulls, &argv, &argc, &request);
846 save_munge_symlinks = munge_symlinks;
848 reset_output_levels(); /* future verbosity is controlled by client options */
849 ret = parse_arguments(&argc, (const char ***) &argv);
850 if (protect_args && ret) {
851 orig_early_argv = orig_argv;
853 read_args(f_in, name, line, sizeof line, 1, &argv, &argc, &request);
855 ret = parse_arguments(&argc, (const char ***) &argv);
857 orig_early_argv = NULL;
859 munge_symlinks = save_munge_symlinks; /* The client mustn't control this. */
862 err_msg = finish_pre_exec(pre_exec_pid, pre_exec_fd, request,
863 orig_early_argv, orig_argv);
867 free(orig_early_argv);
869 am_server = 1; /* Don't let someone try to be tricky. */
871 if (lp_ignore_errors(module_id))
876 if (lp_fake_super(i)) {
877 if (preserve_xattrs > 1)
880 } else if (am_root < 0) /* Treat --fake-super from client as --super. */
883 if (filesfrom_fd == 0)
888 rprintf(FLOG, "rsync %s %s from %s@%s (%s)\n",
889 am_sender ? "on" : "to",
890 request, auth_user, host, addr);
892 rprintf(FLOG, "rsync %s %s from %s (%s)\n",
893 am_sender ? "on" : "to",
894 request, host, addr);
900 /* don't allow the logs to be flooded too fast */
901 limit_output_verbosity(lp_max_verbosity(i));
904 if (protocol_version < 23
905 && (protocol_version == 22 || am_sender))
906 io_start_multiplex_out(f_out);
907 else if (!ret || err_msg) {
908 /* We have to get I/O multiplexing started so that we can
909 * get the error back to the client. This means getting
910 * the protocol setup finished first in later versions. */
911 setup_protocol(f_out, f_in);
913 /* Since we failed in our option parsing, we may not
914 * have finished parsing that the client sent us a
915 * --files-from option, so look for it manually.
916 * Without this, the socket would be in the wrong
917 * state for the upcoming error message. */
920 for (i = 0; i < argc; i++) {
921 if (strncmp(argv[i], "--files-from", 12) == 0) {
928 write_byte(f_out, 0);
930 io_start_multiplex_out(f_out);
933 if (!ret || err_msg) {
935 rwrite(FERROR, err_msg, strlen(err_msg), 0);
939 exit_cleanup(RERR_UNSUPPORTED);
944 if (ic_send != (iconv_t)-1) {
945 iconv_close(ic_send);
946 ic_send = (iconv_t)-1;
948 if (ic_recv != (iconv_t)-1) {
949 iconv_close(ic_recv);
950 ic_recv = (iconv_t)-1;
956 && (use_chroot ? lp_numeric_ids(i) != False : lp_numeric_ids(i) == True))
957 numeric_ids = -1; /* Set --numeric-ids w/o breaking protocol. */
959 if (lp_timeout(i) && (!io_timeout || lp_timeout(i) < io_timeout))
960 set_io_timeout(lp_timeout(i));
962 /* If we have some incoming/outgoing chmod changes, append them to
963 * any user-specified changes (making our changes have priority).
964 * We also get a pointer to just our changes so that a receiver
965 * process can use them separately if --perms wasn't specified. */
967 p = lp_outgoing_chmod(i);
969 p = lp_incoming_chmod(i);
970 if (*p && !(daemon_chmod_modes = parse_chmod(p, &chmod_modes))) {
971 rprintf(FLOG, "Invalid \"%sing chmod\" directive: %s\n",
972 am_sender ? "outgo" : "incom", p);
975 start_server(f_in, f_out, argc, argv);
980 /* send a list of available modules to the client. Don't list those
981 with "list = False". */
982 static void send_listing(int fd)
984 int n = lp_num_modules();
987 for (i = 0; i < n; i++) {
989 io_printf(fd, "%-15s\t%s\n", lp_name(i), lp_comment(i));
992 if (protocol_version >= 25)
993 io_printf(fd,"@RSYNCD: EXIT\n");
996 static int load_config(int globals_only)
999 if (am_server && am_root <= 0)
1000 config_file = RSYNCD_USERCONF;
1002 config_file = RSYNCD_SYSCONF;
1004 return lp_load(config_file, globals_only);
1007 /* this is called when a connection is established to a client
1008 and we want to start talking. The setup of the system is done from
1010 int start_daemon(int f_in, int f_out)
1013 const char *addr, *host;
1016 io_set_sock_fds(f_in, f_out);
1018 /* We must load the config file before calling any function that
1019 * might cause log-file output to occur. This ensures that the
1020 * "log file" param gets honored for the 2 non-forked use-cases
1021 * (when rsync is run by init and run by a remote shell). */
1022 if (!load_config(0))
1023 exit_cleanup(RERR_SYNTAX);
1025 addr = client_addr(f_in);
1026 host = lp_reverse_lookup(-1) ? client_name(f_in) : undetermined_hostname;
1027 rprintf(FLOG, "connect from %s (%s)\n", host, addr);
1030 set_socket_options(f_in, "SO_KEEPALIVE");
1031 set_nonblocking(f_in);
1034 if (exchange_protocols(f_in, f_out, line, sizeof line, 0) < 0)
1038 if (!read_line_old(f_in, line, sizeof line, 0))
1041 if (!*line || strcmp(line, "#list") == 0) {
1042 rprintf(FLOG, "module-list request from %s (%s)\n",
1044 send_listing(f_out);
1049 /* it's some sort of command that I don't understand */
1050 io_printf(f_out, "@ERROR: Unknown command '%s'\n", line);
1054 if ((i = lp_number(line)) < 0) {
1055 rprintf(FLOG, "unknown module '%s' tried from %s (%s)\n",
1057 io_printf(f_out, "@ERROR: Unknown module '%s'\n", line);
1061 #ifdef HAVE_SIGACTION
1062 sigact.sa_flags = SA_NOCLDSTOP;
1064 SIGACTION(SIGCHLD, remember_children);
1066 return rsync_module(f_in, f_out, i, addr, host);
1069 static void create_pid_file(void)
1071 char *pid_file = lp_pid_file();
1073 pid_t pid = getpid();
1076 if (!pid_file || !*pid_file)
1079 cleanup_set_pid(pid);
1080 if ((fd = do_open(pid_file, O_WRONLY|O_CREAT|O_EXCL, 0666)) == -1) {
1083 fprintf(stderr, "failed to create pid file %s: %s\n", pid_file, strerror(errno));
1084 rsyserr(FLOG, errno, "failed to create pid file %s", pid_file);
1085 exit_cleanup(RERR_FILEIO);
1087 snprintf(pidbuf, sizeof pidbuf, "%ld\n", (long)pid);
1088 len = strlen(pidbuf);
1089 if (write(fd, pidbuf, len) != len)
1094 /* Become a daemon, discarding the controlling terminal. */
1095 static void become_daemon(void)
1102 fprintf(stderr, "failed to fork: %s\n", strerror(errno));
1103 exit_cleanup(RERR_FILEIO);
1110 /* detach from the terminal */
1113 #elif defined TIOCNOTTY
1114 i = open("/dev/tty", O_RDWR);
1116 ioctl(i, (int)TIOCNOTTY, (char *)0);
1120 /* make sure that stdin, stdout an stderr don't stuff things
1121 * up (library functions, for example) */
1122 for (i = 0; i < 3; i++) {
1124 open("/dev/null", O_RDWR);
1128 int daemon_main(void)
1130 if (is_a_socket(STDIN_FILENO)) {
1133 /* we are running via inetd - close off stdout and
1134 * stderr so that library functions (and getopt) don't
1135 * try to use them. Redirect them to /dev/null */
1136 for (i = 1; i < 3; i++) {
1138 open("/dev/null", O_RDWR);
1141 return start_daemon(STDIN_FILENO, STDIN_FILENO);
1144 if (!load_config(1)) {
1145 fprintf(stderr, "Failed to parse config file: %s\n", config_file);
1146 exit_cleanup(RERR_SYNTAX);
1155 if (rsync_port == 0 && (rsync_port = lp_rsync_port()) == 0)
1156 rsync_port = RSYNC_PORT;
1157 if (bind_address == NULL && *lp_bind_address())
1158 bind_address = lp_bind_address();
1162 rprintf(FLOG, "rsyncd version %s starting, listening on port %d\n",
1163 RSYNC_VERSION, rsync_port);
1164 /* TODO: If listening on a particular address, then show that
1165 * address too. In fact, why not just do inet_ntop on the
1166 * local address??? */
1168 start_accept_loop(rsync_port, start_daemon);