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) 2002-2014 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 write_fd, int read_fd, char *request,
352 char **early_argv, char **argv)
354 char buf[BIGPATHBUFLEN], *bp;
355 int j = 0, status = -1, msglen = sizeof buf - 1;
360 write_buf(write_fd, request, strlen(request)+1);
362 for ( ; *early_argv; early_argv++)
363 write_buf(write_fd, *early_argv, strlen(*early_argv)+1);
364 j = 1; /* Skip arg0 name in argv. */
366 for ( ; argv[j]; j++)
367 write_buf(write_fd, argv[j], strlen(argv[j])+1);
368 write_byte(write_fd, 0);
372 /* Read the stdout from the pre-xfer exec program. This it is only
373 * displayed to the user if the script also returns an error status. */
374 for (bp = buf; msglen > 0; msglen -= j) {
375 if ((j = read(read_fd, bp, msglen)) <= 0) {
380 break; /* Just ignore the read error for now... */
383 if (j > 1 && bp[-1] == '\n' && bp[-2] == '\r') {
393 if (wait_process(pid, &status, 0) < 0
394 || !WIFEXITED(status) || WEXITSTATUS(status) != 0) {
396 if (asprintf(&e, "pre-xfer exec returned failure (%d)%s%s%s\n%s",
397 status, status < 0 ? ": " : "",
398 status < 0 ? strerror(errno) : "",
399 *buf ? ":" : "", buf) < 0)
400 return "out_of_memory in finish_pre_exec\n";
407 static int read_arg_from_pipe(int fd, char *buf, int limit)
409 char *bp = buf, *eob = buf + limit - 1;
412 int got = read(fd, bp, 1);
414 if (got < 0 && errno == EINTR)
429 static int path_failure(int f_out, const char *dir, BOOL was_chdir)
432 rsyserr(FLOG, errno, "chdir %s failed\n", dir);
434 rprintf(FLOG, "normalize_path(%s) failed\n", dir);
435 io_printf(f_out, "@ERROR: chdir failed\n");
439 static int add_a_group(int f_out, const char *gname)
442 if (!group_to_gid(gname, &gid, True)) {
443 rprintf(FLOG, "Invalid gid %s\n", gname);
444 io_printf(f_out, "@ERROR: invalid gid %s\n", gname);
447 if (gid_count == MAX_GID_LIST) {
448 rprintf(FLOG, "Too many groups specified via gid parameter.\n");
449 io_printf(f_out, "@ERROR: too many groups\n");
452 gid_list[gid_count++] = gid;
456 #ifdef HAVE_GETGROUPLIST
457 static int want_all_groups(int f_out, uid_t uid)
460 gid_count = MAX_GID_LIST;
461 if ((err = getallgroups(uid, gid_list, &gid_count)) != NULL) {
462 rsyserr(FLOG, errno, "%s", err);
463 io_printf(f_out, "@ERROR: %s\n", err);
468 #elif defined HAVE_INITGROUPS
469 static struct passwd *want_all_groups(int f_out, uid_t uid)
472 if ((pw = getpwuid(uid)) == NULL) {
473 rsyserr(FLOG, errno, "getpwuid failed");
474 io_printf(f_out, "@ERROR: getpwuid failed\n");
477 /* Start with the default group and initgroups() will add the reset. */
479 gid_list[0] = pw->pw_gid;
484 static void set_env_str(const char *var, const char *str)
488 if (asprintf(&mem, "%s=%s", var, str) < 0)
489 out_of_memory("set_env_str");
495 static void set_env_num(const char *var, long num)
498 if (asprintf(&mem, "%s=%ld", var, num) < 0)
499 out_of_memory("set_env_num");
504 static int rsync_module(int f_in, int f_out, int i, const char *addr, const char *host)
507 char **argv, **orig_argv, **orig_early_argv, *module_chdir;
508 char line[BIGPATHBUFLEN];
509 #if defined HAVE_INITGROUPS && !defined HAVE_GETGROUPLIST
510 struct passwd *pw = NULL;
514 char *p, *err_msg = NULL;
515 char *name = lp_name(i);
516 int use_chroot = lp_use_chroot(i);
517 int ret, pre_exec_arg_fd = -1, pre_exec_error_fd = -1;
518 int save_munge_symlinks;
519 pid_t pre_exec_pid = 0;
520 char *request = NULL;
522 set_env_str("RSYNC_MODULE_NAME", name);
525 iconv_opt = lp_charset(i);
531 /* If reverse lookup is disabled globally but enabled for this module,
532 * we need to do it now before the access check. */
533 if (host == undetermined_hostname && lp_reverse_lookup(i))
534 host = client_name(f_in);
535 set_env_str("RSYNC_HOST_NAME", host);
536 set_env_str("RSYNC_HOST_ADDR", addr);
538 if (!allow_access(addr, &host, i)) {
539 rprintf(FLOG, "rsync denied on module %s from %s (%s)\n",
542 io_printf(f_out, "@ERROR: Unknown module '%s'\n", name);
545 "@ERROR: access denied to %s from %s (%s)\n",
551 if (am_daemon && am_server) {
552 rprintf(FLOG, "rsync allowed access on module %s from %s (%s)\n",
556 if (!claim_connection(lp_lock_file(i), lp_max_connections(i))) {
558 rsyserr(FLOG, errno, "failed to open lock file %s",
560 io_printf(f_out, "@ERROR: failed to open lock file\n");
562 rprintf(FLOG, "max connections (%d) reached\n",
563 lp_max_connections(i));
564 io_printf(f_out, "@ERROR: max connections (%d) reached -- try again later\n",
565 lp_max_connections(i));
570 read_only = lp_read_only(i); /* may also be overridden by auth_server() */
571 auth_user = auth_server(f_in, f_out, i, host, addr, "@RSYNCD: AUTHREQD ");
574 io_printf(f_out, "@ERROR: auth failed on module %s\n", name);
577 set_env_str("RSYNC_USER_NAME", auth_user);
581 if (lp_transfer_logging(i) && !logfile_format)
582 logfile_format = lp_log_format(i);
583 if (log_format_has(logfile_format, 'i'))
584 logfile_format_has_i = 1;
585 if (logfile_format_has_i || log_format_has(logfile_format, 'o'))
586 logfile_format_has_o_or_i = 1;
589 am_root = (uid == 0);
591 p = *lp_uid(i) ? lp_uid(i) : am_root ? NOBODY_USER : NULL;
593 if (!user_to_uid(p, &uid, True)) {
594 rprintf(FLOG, "Invalid uid %s\n", p);
595 io_printf(f_out, "@ERROR: invalid uid %s\n", p);
602 p = *lp_gid(i) ? strtok(lp_gid(i), ", ") : NULL;
604 /* The "*" gid must be the first item in the list. */
605 if (strcmp(p, "*") == 0) {
606 #ifdef HAVE_GETGROUPLIST
607 if (want_all_groups(f_out, uid) < 0)
609 #elif defined HAVE_INITGROUPS
610 if ((pw = want_all_groups(f_out, uid)) == NULL)
613 rprintf(FLOG, "This rsync does not support a gid of \"*\"\n");
614 io_printf(f_out, "@ERROR: invalid gid setting.\n");
617 } else if (add_a_group(f_out, p) < 0)
619 while ((p = strtok(NULL, ", ")) != NULL) {
620 #if defined HAVE_INITGROUPS && !defined HAVE_GETGROUPLIST
622 rprintf(FLOG, "This rsync cannot add groups after \"*\".\n");
623 io_printf(f_out, "@ERROR: invalid gid setting.\n");
627 if (add_a_group(f_out, p) < 0)
630 } else if (am_root) {
631 if (add_a_group(f_out, NOBODY_GROUP) < 0)
635 module_dir = lp_path(i);
636 if (*module_dir == '\0') {
637 rprintf(FLOG, "No path specified for module %s\n", name);
638 io_printf(f_out, "@ERROR: no path setting.\n");
642 if ((p = strstr(module_dir, "/./")) != NULL) {
643 *p = '\0'; /* Temporary... */
644 if (!(module_chdir = normalize_path(module_dir, True, NULL)))
645 return path_failure(f_out, module_dir, False);
647 if (!(p = normalize_path(p + 2, True, &module_dirlen)))
648 return path_failure(f_out, strstr(module_dir, "/./"), False);
649 if (!(full_module_path = normalize_path(module_dir, False, NULL)))
650 full_module_path = module_dir;
653 if (!(module_chdir = normalize_path(module_dir, False, NULL)))
654 return path_failure(f_out, module_dir, False);
655 full_module_path = module_chdir;
660 if (!(module_chdir = normalize_path(module_dir, False, &module_dirlen)))
661 return path_failure(f_out, module_dir, False);
662 full_module_path = module_dir = module_chdir;
664 set_env_str("RSYNC_MODULE_PATH", full_module_path);
666 if (module_dirlen == 1) {
668 set_filter_dir("/", 1);
670 set_filter_dir(module_dir, module_dirlen);
673 parse_filter_str(&daemon_filter_list, p, rule_template(FILTRULE_WORD_SPLIT),
674 XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3);
676 p = lp_include_from(i);
677 parse_filter_file(&daemon_filter_list, p, rule_template(FILTRULE_INCLUDE),
678 XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3 | XFLG_OLD_PREFIXES | XFLG_FATAL_ERRORS);
681 parse_filter_str(&daemon_filter_list, p,
682 rule_template(FILTRULE_INCLUDE | FILTRULE_WORD_SPLIT),
683 XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3 | XFLG_OLD_PREFIXES);
685 p = lp_exclude_from(i);
686 parse_filter_file(&daemon_filter_list, p, rule_template(0),
687 XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3 | XFLG_OLD_PREFIXES | XFLG_FATAL_ERRORS);
690 parse_filter_str(&daemon_filter_list, p, rule_template(FILTRULE_WORD_SPLIT),
691 XFLG_ABS_IF_SLASH | XFLG_DIR2WILD3 | XFLG_OLD_PREFIXES);
696 if (*lp_prexfer_exec(i) || *lp_postxfer_exec(i)) {
699 /* For post-xfer exec, fork a new process to run the rsync
700 * daemon while this process waits for the exit status and
701 * runs the indicated command at that point. */
702 if (*lp_postxfer_exec(i)) {
705 rsyserr(FLOG, errno, "fork failed");
706 io_printf(f_out, "@ERROR: fork failed\n");
713 set_env_num("RSYNC_PID", (long)pid);
714 if (wait_process(pid, &status, 0) < 0)
716 set_env_num("RSYNC_RAW_STATUS", status);
717 if (WIFEXITED(status))
718 status = WEXITSTATUS(status);
721 set_env_num("RSYNC_EXIT_STATUS", status);
722 if (system(lp_postxfer_exec(i)) < 0)
727 /* For pre-xfer exec, fork a child process to run the indicated
728 * command, though it first waits for the parent process to
729 * send us the user's request via a pipe. */
730 if (*lp_prexfer_exec(i)) {
731 int arg_fds[2], error_fds[2];
732 set_env_num("RSYNC_PID", (long)getpid());
733 if (pipe(arg_fds) < 0 || pipe(error_fds) < 0 || (pre_exec_pid = fork()) < 0) {
734 rsyserr(FLOG, errno, "pre-xfer exec preparation failed");
735 io_printf(f_out, "@ERROR: pre-xfer exec preparation failed\n");
738 if (pre_exec_pid == 0) {
739 char buf[BIGPATHBUFLEN];
743 pre_exec_arg_fd = arg_fds[0];
744 pre_exec_error_fd = error_fds[1];
745 set_blocking(pre_exec_arg_fd);
746 set_blocking(pre_exec_error_fd);
747 len = read_arg_from_pipe(pre_exec_arg_fd, buf, BIGPATHBUFLEN);
750 set_env_str("RSYNC_REQUEST", buf);
752 len = read_arg_from_pipe(pre_exec_arg_fd, buf,
759 if (asprintf(&p, "RSYNC_ARG%d=%s", j, buf) >= 0)
762 close(pre_exec_arg_fd);
764 dup2(pre_exec_error_fd, STDOUT_FILENO);
765 close(pre_exec_error_fd);
766 status = system(lp_prexfer_exec(i));
767 if (!WIFEXITED(status))
769 _exit(WEXITSTATUS(status));
773 pre_exec_arg_fd = arg_fds[1];
774 pre_exec_error_fd = error_fds[0];
775 set_blocking(pre_exec_arg_fd);
776 set_blocking(pre_exec_error_fd);
783 * XXX: The 'use chroot' flag is a fairly reliable
784 * source of confusion, because it fails under two
785 * important circumstances: running as non-root,
786 * running on Win32 (or possibly others). On the
787 * other hand, if you are running as root, then it
788 * might be better to always use chroot.
790 * So, perhaps if we can't chroot we should just issue
791 * a warning, unless a "require chroot" flag is set,
792 * in which case we fail.
794 if (chroot(module_chdir)) {
795 rsyserr(FLOG, errno, "chroot %s failed", module_chdir);
796 io_printf(f_out, "@ERROR: chroot failed\n");
799 module_chdir = module_dir;
802 if (!change_dir(module_chdir, CD_NORMAL))
803 return path_failure(f_out, module_chdir, True);
804 if (module_dirlen || !use_chroot)
807 if ((munge_symlinks = lp_munge_symlinks(i)) < 0)
808 munge_symlinks = !use_chroot || module_dirlen;
809 if (munge_symlinks) {
811 char prefix[SYMLINK_PREFIX_LEN]; /* NOT +1 ! */
812 strlcpy(prefix, SYMLINK_PREFIX, sizeof prefix); /* trim the trailing slash */
813 if (do_stat(prefix, &st) == 0 && S_ISDIR(st.st_mode)) {
814 rprintf(FLOG, "Symlink munging is unsafe when a %s directory exists.\n",
816 io_printf(f_out, "@ERROR: daemon security issue -- contact admin\n", name);
817 exit_cleanup(RERR_UNSUPPORTED);
822 if (setgid(gid_list[0])) {
823 rsyserr(FLOG, errno, "setgid %ld failed", (long)gid_list[0]);
824 io_printf(f_out, "@ERROR: setgid failed\n");
827 #ifdef HAVE_SETGROUPS
828 /* Set the group(s) we want to be active. */
829 if (setgroups(gid_count, gid_list)) {
830 rsyserr(FLOG, errno, "setgroups failed");
831 io_printf(f_out, "@ERROR: setgroups failed\n");
835 #if defined HAVE_INITGROUPS && !defined HAVE_GETGROUPLIST
836 /* pw is set if the user wants all the user's groups. */
837 if (pw && initgroups(pw->pw_name, pw->pw_gid) < 0) {
838 rsyserr(FLOG, errno, "initgroups failed");
839 io_printf(f_out, "@ERROR: initgroups failed\n");
851 rsyserr(FLOG, errno, "setuid %ld failed", (long)uid);
852 io_printf(f_out, "@ERROR: setuid failed\n");
856 am_root = (MY_UID() == 0);
859 if (lp_temp_dir(i) && *lp_temp_dir(i)) {
860 tmpdir = lp_temp_dir(i);
861 if (strlen(tmpdir) >= MAXPATHLEN - 10) {
863 "the 'temp dir' value for %s is WAY too long -- ignoring.\n",
869 io_printf(f_out, "@RSYNCD: OK\n");
871 read_args(f_in, name, line, sizeof line, rl_nulls, &argv, &argc, &request);
874 save_munge_symlinks = munge_symlinks;
876 reset_output_levels(); /* future verbosity is controlled by client options */
877 ret = parse_arguments(&argc, (const char ***) &argv);
878 if (protect_args && ret) {
879 orig_early_argv = orig_argv;
881 read_args(f_in, name, line, sizeof line, 1, &argv, &argc, &request);
883 ret = parse_arguments(&argc, (const char ***) &argv);
885 orig_early_argv = NULL;
887 munge_symlinks = save_munge_symlinks; /* The client mustn't control this. */
890 err_msg = finish_pre_exec(pre_exec_pid, pre_exec_arg_fd, pre_exec_error_fd,
891 request, orig_early_argv, orig_argv);
895 free(orig_early_argv);
897 am_server = 1; /* Don't let someone try to be tricky. */
899 if (lp_ignore_errors(module_id))
904 if (lp_fake_super(i)) {
905 if (preserve_xattrs > 1)
908 } else if (am_root < 0) /* Treat --fake-super from client as --super. */
911 if (filesfrom_fd == 0)
916 rprintf(FLOG, "rsync %s %s from %s@%s (%s)\n",
917 am_sender ? "on" : "to",
918 request, auth_user, host, addr);
920 rprintf(FLOG, "rsync %s %s from %s (%s)\n",
921 am_sender ? "on" : "to",
922 request, host, addr);
928 /* don't allow the logs to be flooded too fast */
929 limit_output_verbosity(lp_max_verbosity(i));
932 if (protocol_version < 23
933 && (protocol_version == 22 || am_sender))
934 io_start_multiplex_out(f_out);
935 else if (!ret || err_msg) {
936 /* We have to get I/O multiplexing started so that we can
937 * get the error back to the client. This means getting
938 * the protocol setup finished first in later versions. */
939 setup_protocol(f_out, f_in);
941 /* Since we failed in our option parsing, we may not
942 * have finished parsing that the client sent us a
943 * --files-from option, so look for it manually.
944 * Without this, the socket would be in the wrong
945 * state for the upcoming error message. */
948 for (i = 0; i < argc; i++) {
949 if (strncmp(argv[i], "--files-from", 12) == 0) {
956 write_byte(f_out, 0);
958 io_start_multiplex_out(f_out);
961 if (!ret || err_msg) {
963 while ((p = strchr(err_msg, '\n')) != NULL) {
964 int len = p - err_msg + 1;
965 rwrite(FERROR, err_msg, len, 0);
969 rprintf(FERROR, "%s\n", err_msg);
973 exit_cleanup(RERR_UNSUPPORTED);
978 if (ic_send != (iconv_t)-1) {
979 iconv_close(ic_send);
980 ic_send = (iconv_t)-1;
982 if (ic_recv != (iconv_t)-1) {
983 iconv_close(ic_recv);
984 ic_recv = (iconv_t)-1;
990 && (use_chroot ? lp_numeric_ids(i) != False : lp_numeric_ids(i) == True))
991 numeric_ids = -1; /* Set --numeric-ids w/o breaking protocol. */
993 if (lp_timeout(i) && (!io_timeout || lp_timeout(i) < io_timeout))
994 set_io_timeout(lp_timeout(i));
996 /* If we have some incoming/outgoing chmod changes, append them to
997 * any user-specified changes (making our changes have priority).
998 * We also get a pointer to just our changes so that a receiver
999 * process can use them separately if --perms wasn't specified. */
1001 p = lp_outgoing_chmod(i);
1003 p = lp_incoming_chmod(i);
1004 if (*p && !(daemon_chmod_modes = parse_chmod(p, &chmod_modes))) {
1005 rprintf(FLOG, "Invalid \"%sing chmod\" directive: %s\n",
1006 am_sender ? "outgo" : "incom", p);
1009 start_server(f_in, f_out, argc, argv);
1014 /* send a list of available modules to the client. Don't list those
1015 with "list = False". */
1016 static void send_listing(int fd)
1018 int n = lp_num_modules();
1021 for (i = 0; i < n; i++) {
1023 io_printf(fd, "%-15s\t%s\n", lp_name(i), lp_comment(i));
1026 if (protocol_version >= 25)
1027 io_printf(fd,"@RSYNCD: EXIT\n");
1030 static int load_config(int globals_only)
1033 if (am_server && am_root <= 0)
1034 config_file = RSYNCD_USERCONF;
1036 config_file = RSYNCD_SYSCONF;
1038 return lp_load(config_file, globals_only);
1041 /* this is called when a connection is established to a client
1042 and we want to start talking. The setup of the system is done from
1044 int start_daemon(int f_in, int f_out)
1047 const char *addr, *host;
1050 io_set_sock_fds(f_in, f_out);
1052 /* We must load the config file before calling any function that
1053 * might cause log-file output to occur. This ensures that the
1054 * "log file" param gets honored for the 2 non-forked use-cases
1055 * (when rsync is run by init and run by a remote shell). */
1056 if (!load_config(0))
1057 exit_cleanup(RERR_SYNTAX);
1059 addr = client_addr(f_in);
1060 host = lp_reverse_lookup(-1) ? client_name(f_in) : undetermined_hostname;
1061 rprintf(FLOG, "connect from %s (%s)\n", host, addr);
1064 set_socket_options(f_in, "SO_KEEPALIVE");
1065 set_nonblocking(f_in);
1068 if (exchange_protocols(f_in, f_out, line, sizeof line, 0) < 0)
1072 if (!read_line_old(f_in, line, sizeof line, 0))
1075 if (!*line || strcmp(line, "#list") == 0) {
1076 rprintf(FLOG, "module-list request from %s (%s)\n",
1078 send_listing(f_out);
1083 /* it's some sort of command that I don't understand */
1084 io_printf(f_out, "@ERROR: Unknown command '%s'\n", line);
1088 if ((i = lp_number(line)) < 0) {
1089 rprintf(FLOG, "unknown module '%s' tried from %s (%s)\n",
1091 io_printf(f_out, "@ERROR: Unknown module '%s'\n", line);
1095 #ifdef HAVE_SIGACTION
1096 sigact.sa_flags = SA_NOCLDSTOP;
1098 SIGACTION(SIGCHLD, remember_children);
1100 return rsync_module(f_in, f_out, i, addr, host);
1103 static void create_pid_file(void)
1105 char *pid_file = lp_pid_file();
1107 pid_t pid = getpid();
1110 if (!pid_file || !*pid_file)
1113 cleanup_set_pid(pid);
1114 if ((fd = do_open(pid_file, O_WRONLY|O_CREAT|O_EXCL, 0666)) == -1) {
1117 fprintf(stderr, "failed to create pid file %s: %s\n", pid_file, strerror(errno));
1118 rsyserr(FLOG, errno, "failed to create pid file %s", pid_file);
1119 exit_cleanup(RERR_FILEIO);
1121 snprintf(pidbuf, sizeof pidbuf, "%d\n", (int)pid);
1122 len = strlen(pidbuf);
1123 if (write(fd, pidbuf, len) != len)
1128 /* Become a daemon, discarding the controlling terminal. */
1129 static void become_daemon(void)
1136 fprintf(stderr, "failed to fork: %s\n", strerror(errno));
1137 exit_cleanup(RERR_FILEIO);
1144 /* detach from the terminal */
1147 #elif defined TIOCNOTTY
1148 i = open("/dev/tty", O_RDWR);
1150 ioctl(i, (int)TIOCNOTTY, (char *)0);
1154 /* make sure that stdin, stdout an stderr don't stuff things
1155 * up (library functions, for example) */
1156 for (i = 0; i < 3; i++) {
1158 open("/dev/null", O_RDWR);
1162 int daemon_main(void)
1164 if (is_a_socket(STDIN_FILENO)) {
1167 /* we are running via inetd - close off stdout and
1168 * stderr so that library functions (and getopt) don't
1169 * try to use them. Redirect them to /dev/null */
1170 for (i = 1; i < 3; i++) {
1172 open("/dev/null", O_RDWR);
1175 return start_daemon(STDIN_FILENO, STDIN_FILENO);
1178 if (!load_config(1)) {
1179 fprintf(stderr, "Failed to parse config file: %s\n", config_file);
1180 exit_cleanup(RERR_SYNTAX);
1189 if (rsync_port == 0 && (rsync_port = lp_rsync_port()) == 0)
1190 rsync_port = RSYNC_PORT;
1191 if (bind_address == NULL && *lp_bind_address())
1192 bind_address = lp_bind_address();
1196 rprintf(FLOG, "rsyncd version %s starting, listening on port %d\n",
1197 RSYNC_VERSION, rsync_port);
1198 /* TODO: If listening on a particular address, then show that
1199 * address too. In fact, why not just do getnameinfo on the
1200 * local address??? */
1202 start_accept_loop(rsync_port, start_daemon);