1 /* -*- c-file-style: "linux"; -*-
3 * Copyright (C) 1998-2001 by Andrew Tridgell <tridge@samba.org>
4 * Copyright (C) 2001-2002 by Martin Pool <mbp@samba.org>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 * The socket based protocol for setting up a connection with
37 extern int rsync_port
;
38 extern int kluge_around_eof
;
39 extern int daemon_over_rsh
;
40 extern int sanitize_paths
;
41 extern int filesfrom_fd
;
42 extern int remote_protocol
;
43 extern int protocol_version
;
44 extern int io_timeout
;
45 extern int orig_umask
;
47 extern int default_af_hint
;
48 extern char *bind_address
;
49 extern char *sockopts
;
50 extern char *config_file
;
51 extern char *files_from
;
53 extern struct chmod_mode_struct
*chmod_modes
;
54 extern struct filter_list_struct server_filter_list
;
58 int daemon_log_format_has_i
= 0;
59 int daemon_log_format_has_o_or_i
= 0;
61 struct chmod_mode_struct
*daemon_chmod_modes
;
63 /* Length of lp_path() string when in daemon mode & not chrooted, else 0. */
64 unsigned int module_dirlen
= 0;
67 static struct sigaction sigact
;
71 * Run a client connected to an rsyncd. The alternative to this
72 * function for remote-shell connections is do_cmd().
74 * After negotiating which module to use and reading the server's
75 * motd, this hands over to client_run(). Telling the server the
76 * module will cause it to chroot/setuid/etc.
78 * Instead of doing a transfer, the client may at this stage instead
79 * get a listing of remote modules and exit.
81 * @return -1 for error in startup, or the result of client_run().
82 * Either way, it eventually gets passed to exit_cleanup().
84 int start_socket_client(char *host
, char *path
, int argc
, char *argv
[])
87 char *p
, *user
= NULL
;
89 /* This is redundant with code in start_inband_exchange(), but this
90 * short-circuits a problem in the client before we open a socket,
91 * and the extra check won't hurt. */
94 "ERROR: The remote path must start with a module name not a /\n");
98 if ((p
= strrchr(host
, '@')) != NULL
) {
104 fd
= open_socket_out_wrapped(host
, rsync_port
, bind_address
,
107 exit_cleanup(RERR_SOCKETIO
);
109 set_socket_options(fd
, sockopts
);
111 ret
= start_inband_exchange(user
, path
, fd
, fd
, argc
);
113 return ret
? ret
: client_run(fd
, fd
, -1, argc
, argv
);
116 int start_inband_exchange(char *user
, char *path
, int f_in
, int f_out
,
120 char *sargs
[MAX_ARGS
];
122 char line
[BIGPATHBUFLEN
];
125 if (argc
== 0 && !am_sender
)
130 "ERROR: The remote path must start with a module name\n");
135 user
= getenv("USER");
137 user
= getenv("LOGNAME");
139 io_printf(f_out
, "@RSYNCD: %d\n", protocol_version
);
141 if (!read_line(f_in
, line
, sizeof line
- 1)) {
142 rprintf(FERROR
, "rsync: did not see server greeting\n");
146 if (sscanf(line
,"@RSYNCD: %d", &remote_protocol
) != 1) {
147 /* note that read_line strips of \n or \r */
148 rprintf(FERROR
, "rsync: server sent \"%s\" rather than greeting\n",
152 if (protocol_version
> remote_protocol
)
153 protocol_version
= remote_protocol
;
155 if (list_only
&& protocol_version
>= 29)
158 /* set daemon_over_rsh to false since we need to build the
159 * true set of args passed through the rsh/ssh connection;
160 * this is a no-op for direct-socket-connection mode */
162 server_options(sargs
, &sargc
);
164 sargs
[sargc
++] = ".";
167 sargs
[sargc
++] = path
;
172 print_child_argv(sargs
);
174 p
= strchr(path
,'/');
176 io_printf(f_out
, "%s\n", path
);
179 /* Old servers may just drop the connection here,
180 rather than sending a proper EXIT command. Yuck. */
181 kluge_around_eof
= list_only
&& protocol_version
< 25 ? 1 : 0;
184 if (!read_line(f_in
, line
, sizeof line
- 1)) {
185 rprintf(FERROR
, "rsync: didn't get server startup line\n");
189 if (strncmp(line
,"@RSYNCD: AUTHREQD ",18) == 0) {
190 auth_client(f_out
, user
, line
+18);
194 if (strcmp(line
,"@RSYNCD: OK") == 0)
197 if (strcmp(line
,"@RSYNCD: EXIT") == 0) {
198 /* This is sent by recent versions of the
199 * server to terminate the listing of modules.
200 * We don't want to go on and transfer
201 * anything; just exit. */
205 if (strncmp(line
, "@ERROR", 6) == 0) {
206 rprintf(FERROR
, "%s\n", line
);
207 /* This is always fatal; the server will now
208 * close the socket. */
212 rprintf(FINFO
, "%s\n", line
);
214 kluge_around_eof
= 0;
216 for (i
= 0; i
< sargc
; i
++) {
217 io_printf(f_out
, "%s\n", sargs
[i
]);
219 io_printf(f_out
, "\n");
221 if (protocol_version
< 23) {
222 if (protocol_version
== 22 || !am_sender
)
223 io_start_multiplex_in();
229 static char *finish_pre_exec(pid_t pid
, int fd
, char *request
,
230 int argc
, char *argv
[])
235 write_buf(fd
, request
, strlen(request
)+1);
236 for (j
= 0; j
< argc
; j
++)
237 write_buf(fd
, argv
[j
], strlen(argv
[j
])+1);
244 if (wait_process(pid
, &status
, 0) < 0
245 || !WIFEXITED(status
) || WEXITSTATUS(status
) != 0) {
247 if (asprintf(&e
, "pre-xfer exec returned failure (%d)\n", status
) < 0)
248 out_of_memory("finish_pre_exec");
254 static int read_arg_from_pipe(int fd
, char *buf
, int limit
)
256 char *bp
= buf
, *eob
= buf
+ limit
- 1;
259 if (read(fd
, bp
, 1) != 1)
271 static int rsync_module(int f_in
, int f_out
, int i
)
276 char line
[BIGPATHBUFLEN
];
277 uid_t uid
= (uid_t
)-2; /* canonically "nobody" */
278 gid_t gid
= (gid_t
)-2;
279 char *p
, *err_msg
= NULL
;
280 char *addr
= client_addr(f_in
);
281 char *host
= client_name(f_in
);
282 char *name
= lp_name(i
);
283 int use_chroot
= lp_use_chroot(i
);
285 int ret
, pre_exec_fd
= -1;
286 pid_t pre_exec_pid
= 0;
287 char *request
= NULL
;
289 if (!allow_access(addr
, host
, lp_hosts_allow(i
), lp_hosts_deny(i
))) {
290 rprintf(FLOG
, "rsync denied on module %s from %s (%s)\n",
293 io_printf(f_out
, "@ERROR: Unknown module '%s'\n", name
);
296 "@ERROR: access denied to %s from %s (%s)\n",
302 if (am_daemon
&& am_server
) {
303 rprintf(FLOG
, "rsync allowed access on module %s from %s (%s)\n",
307 if (!claim_connection(lp_lock_file(i
), lp_max_connections(i
))) {
309 rsyserr(FLOG
, errno
, "failed to open lock file %s",
311 io_printf(f_out
, "@ERROR: failed to open lock file\n");
313 rprintf(FLOG
, "max connections (%d) reached\n",
314 lp_max_connections(i
));
315 io_printf(f_out
, "@ERROR: max connections (%d) reached -- try again later\n",
316 lp_max_connections(i
));
321 auth_user
= auth_server(f_in
, f_out
, i
, host
, addr
, "@RSYNCD: AUTHREQD ");
324 io_printf(f_out
, "@ERROR: auth failed on module %s\n", name
);
333 if (lp_transfer_logging(i
)) {
334 if (log_format_has(lp_log_format(i
), 'i'))
335 daemon_log_format_has_i
= 1;
336 if (daemon_log_format_has_i
337 || log_format_has(lp_log_format(i
), 'o'))
338 daemon_log_format_has_o_or_i
= 1;
341 am_root
= (MY_UID() == 0);
345 if (!name_to_uid(p
, &uid
)) {
346 if (!isdigit(*(unsigned char *)p
)) {
347 rprintf(FLOG
, "Invalid uid %s\n", p
);
348 io_printf(f_out
, "@ERROR: invalid uid %s\n", p
);
355 if (!name_to_gid(p
, &gid
)) {
356 if (!isdigit(*(unsigned char *)p
)) {
357 rprintf(FLOG
, "Invalid gid %s\n", p
);
358 io_printf(f_out
, "@ERROR: invalid gid %s\n", p
);
365 /* TODO: If we're not root, but the configuration requests
366 * that we change to some uid other than the current one, then
369 /* TODO: Perhaps take a list of gids, and make them into the
370 * supplementary groups. */
372 if (use_chroot
|| (module_dirlen
= strlen(lp_path(i
))) == 1) {
374 set_filter_dir("/", 1);
376 set_filter_dir(lp_path(i
), module_dirlen
);
379 parse_rule(&server_filter_list
, p
, MATCHFLG_WORD_SPLIT
,
382 p
= lp_include_from(i
);
383 parse_filter_file(&server_filter_list
, p
, MATCHFLG_INCLUDE
,
384 XFLG_ABS_IF_SLASH
| XFLG_OLD_PREFIXES
| XFLG_FATAL_ERRORS
);
387 parse_rule(&server_filter_list
, p
,
388 MATCHFLG_INCLUDE
| MATCHFLG_WORD_SPLIT
,
389 XFLG_ABS_IF_SLASH
| XFLG_OLD_PREFIXES
);
391 p
= lp_exclude_from(i
);
392 parse_filter_file(&server_filter_list
, p
, 0,
393 XFLG_ABS_IF_SLASH
| XFLG_OLD_PREFIXES
| XFLG_FATAL_ERRORS
);
396 parse_rule(&server_filter_list
, p
, MATCHFLG_WORD_SPLIT
,
397 XFLG_ABS_IF_SLASH
| XFLG_OLD_PREFIXES
);
402 if (*lp_prexfer_exec(i
) || *lp_postxfer_exec(i
)) {
403 char *modname
, *modpath
, *hostaddr
, *hostname
, *username
;
405 if (asprintf(&modname
, "RSYNC_MODULE_NAME=%s", name
) < 0
406 || asprintf(&modpath
, "RSYNC_MODULE_PATH=%s", lp_path(i
)) < 0
407 || asprintf(&hostaddr
, "RSYNC_HOST_ADDR=%s", addr
) < 0
408 || asprintf(&hostname
, "RSYNC_HOST_NAME=%s", host
) < 0
409 || asprintf(&username
, "RSYNC_USER_NAME=%s", auth_user
) < 0)
410 out_of_memory("rsync_module");
417 /* For post-xfer exec, fork a new process to run the rsync
418 * daemon while this process waits for the exit status and
419 * runs the indicated command at that point. */
420 if (*lp_postxfer_exec(i
)) {
423 rsyserr(FLOG
, errno
, "fork failed");
424 io_printf(f_out
, "@ERROR: fork failed\n");
429 if (wait_process(pid
, &status
, 0) < 0)
431 if (asprintf(&ret1
, "RSYNC_RAW_STATUS=%d", status
) > 0)
433 if (WIFEXITED(status
))
434 status
= WEXITSTATUS(status
);
437 if (asprintf(&ret2
, "RSYNC_EXIT_STATUS=%d", status
) > 0)
439 system(lp_postxfer_exec(i
));
443 /* For pre-xfer exec, fork a child process to run the indicated
444 * command, though it first waits for the parent process to
445 * send us the user's request via a pipe. */
446 if (*lp_prexfer_exec(i
)) {
448 if (pipe(fds
) < 0 || (pre_exec_pid
= fork()) < 0) {
449 rsyserr(FLOG
, errno
, "pre-xfer exec preparation failed");
450 io_printf(f_out
, "@ERROR: pre-xfer exec preparation failed\n");
453 if (pre_exec_pid
== 0) {
454 char buf
[BIGPATHBUFLEN
];
457 set_blocking(fds
[0]);
458 len
= read_arg_from_pipe(fds
[0], buf
, BIGPATHBUFLEN
);
461 if (asprintf(&p
, "RSYNC_REQUEST=%s", buf
) < 0)
462 out_of_memory("rsync_module");
465 len
= read_arg_from_pipe(fds
[0], buf
,
472 if (asprintf(&p
, "RSYNC_ARG%d=%s", j
, buf
) < 0)
473 out_of_memory("rsync_module");
478 close(STDOUT_FILENO
);
479 status
= system(lp_prexfer_exec(i
));
480 if (!WIFEXITED(status
))
482 _exit(WEXITSTATUS(status
));
485 set_blocking(fds
[1]);
486 pre_exec_fd
= fds
[1];
494 * XXX: The 'use chroot' flag is a fairly reliable
495 * source of confusion, because it fails under two
496 * important circumstances: running as non-root,
497 * running on Win32 (or possibly others). On the
498 * other hand, if you are running as root, then it
499 * might be better to always use chroot.
501 * So, perhaps if we can't chroot we should just issue
502 * a warning, unless a "require chroot" flag is set,
503 * in which case we fail.
505 if (chroot(lp_path(i
))) {
506 rsyserr(FLOG
, errno
, "chroot %s failed",
508 io_printf(f_out
, "@ERROR: chroot failed\n");
512 if (!push_dir("/")) {
513 rsyserr(FLOG
, errno
, "chdir %s failed\n",
515 io_printf(f_out
, "@ERROR: chdir failed\n");
520 if (!push_dir(lp_path(i
))) {
521 rsyserr(FLOG
, errno
, "chdir %s failed\n",
523 io_printf(f_out
, "@ERROR: chdir failed\n");
530 /* XXXX: You could argue that if the daemon is started
531 * by a non-root user and they explicitly specify a
532 * gid, then we should try to change to that gid --
533 * this could be possible if it's already in their
534 * supplementary groups. */
536 /* TODO: Perhaps we need to document that if rsyncd is
537 * started by somebody other than root it will inherit
538 * all their supplementary groups. */
541 rsyserr(FLOG
, errno
, "setgid %d failed", (int)gid
);
542 io_printf(f_out
, "@ERROR: setgid failed\n");
545 #ifdef HAVE_SETGROUPS
546 /* Get rid of any supplementary groups this process
547 * might have inheristed. */
548 if (setgroups(1, &gid
)) {
549 rsyserr(FLOG
, errno
, "setgroups failed");
550 io_printf(f_out
, "@ERROR: setgroups failed\n");
556 rsyserr(FLOG
, errno
, "setuid %d failed", (int)uid
);
557 io_printf(f_out
, "@ERROR: setuid failed\n");
561 am_root
= (MY_UID() == 0);
564 if (lp_temp_dir(i
) && *lp_temp_dir(i
)) {
565 tmpdir
= lp_temp_dir(i
);
566 if (strlen(tmpdir
) >= MAXPATHLEN
- 10) {
568 "the 'temp dir' value for %s is WAY too long -- ignoring.\n",
574 io_printf(f_out
, "@RSYNCD: OK\n");
577 if (!(argv
= new_array(char *, maxargs
)))
578 out_of_memory("rsync_module");
579 argv
[argc
++] = "rsyncd";
582 if (!read_line(f_in
, line
, sizeof line
- 1))
590 if (argc
== maxargs
) {
592 if (!(argv
= realloc_array(argv
, char *, maxargs
)))
593 out_of_memory("rsync_module");
595 if (!(argv
[argc
] = strdup(p
)))
596 out_of_memory("rsync_module");
598 switch (start_glob
) {
601 if (strcmp(line
, ".") == 0)
606 err_msg
= finish_pre_exec(pre_exec_pid
,
616 glob_expand(name
, &argv
, &argc
, &maxargs
);
622 err_msg
= finish_pre_exec(pre_exec_pid
, pre_exec_fd
, request
,
626 verbose
= 0; /* future verbosity is controlled by client options */
627 ret
= parse_arguments(&argc
, (const char ***) &argv
, 0);
628 quiet
= 0; /* Don't let someone try to be tricky. */
630 if (filesfrom_fd
== 0)
635 rprintf(FLOG
, "rsync %s %s from %s@%s (%s)\n",
636 am_sender
? "on" : "to",
637 request
, auth_user
, host
, addr
);
639 rprintf(FLOG
, "rsync %s %s from %s (%s)\n",
640 am_sender
? "on" : "to",
641 request
, host
, addr
);
647 /* don't allow the logs to be flooded too fast */
648 if (verbose
> lp_max_verbosity(i
))
649 verbose
= lp_max_verbosity(i
);
652 if (protocol_version
< 23
653 && (protocol_version
== 22 || am_sender
))
654 io_start_multiplex_out();
655 else if (!ret
|| err_msg
) {
656 /* We have to get I/O multiplexing started so that we can
657 * get the error back to the client. This means getting
658 * the protocol setup finished first in later versions. */
659 setup_protocol(f_out
, f_in
);
661 /* Since we failed in our option parsing, we may not
662 * have finished parsing that the client sent us a
663 * --files-from option, so look for it manually.
664 * Without this, the socket would be in the wrong
665 * state for the upcoming error message. */
668 for (i
= 0; i
< argc
; i
++) {
669 if (strncmp(argv
[i
], "--files-from", 12) == 0) {
676 write_byte(f_out
, 0);
678 io_start_multiplex_out();
681 if (!ret
|| err_msg
) {
683 rprintf(FERROR
, err_msg
);
687 exit_cleanup(RERR_UNSUPPORTED
);
690 if (lp_timeout(i
) && lp_timeout(i
) > io_timeout
)
691 set_io_timeout(lp_timeout(i
));
693 /* If we have some incoming/outgoing chmod changes, append them to
694 * any user-specified changes (making our changes have priority).
695 * We also get a pointer to just our changes so that a receiver
696 * process can use them separately if --perms wasn't specified. */
698 p
= lp_outgoing_chmod(i
);
700 p
= lp_incoming_chmod(i
);
701 if (*p
&& !(daemon_chmod_modes
= parse_chmod(p
, &chmod_modes
))) {
702 rprintf(FLOG
, "Invalid \"%sing chmod\" directive: %s\n",
703 am_sender
? "outgo" : "incom", p
);
706 start_server(f_in
, f_out
, argc
, argv
);
711 /* send a list of available modules to the client. Don't list those
712 with "list = False". */
713 static void send_listing(int fd
)
715 int n
= lp_numservices();
718 for (i
= 0; i
< n
; i
++) {
720 io_printf(fd
, "%-15s\t%s\n", lp_name(i
), lp_comment(i
));
723 if (protocol_version
>= 25)
724 io_printf(fd
,"@RSYNCD: EXIT\n");
727 /* this is called when a connection is established to a client
728 and we want to start talking. The setup of the system is done from
730 int start_daemon(int f_in
, int f_out
)
736 io_set_sock_fds(f_in
, f_out
);
738 if (!lp_load(config_file
, 0))
739 exit_cleanup(RERR_SYNTAX
);
744 set_socket_options(f_in
, "SO_KEEPALIVE");
746 set_socket_options(f_in
, sockopts
);
748 set_socket_options(f_in
, lp_socket_options());
749 set_nonblocking(f_in
);
752 io_printf(f_out
, "@RSYNCD: %d\n", protocol_version
);
754 motd
= lp_motd_file();
756 FILE *f
= fopen(motd
,"r");
757 while (f
&& !feof(f
)) {
758 int len
= fread(line
, 1, sizeof line
- 1, f
);
761 io_printf(f_out
, "%s", line
);
766 io_printf(f_out
, "\n");
769 if (!read_line(f_in
, line
, sizeof line
- 1))
772 if (sscanf(line
,"@RSYNCD: %d", &remote_protocol
) != 1) {
773 io_printf(f_out
, "@ERROR: protocol startup error\n");
776 if (protocol_version
> remote_protocol
)
777 protocol_version
= remote_protocol
;
780 if (!read_line(f_in
, line
, sizeof line
- 1))
783 if (!*line
|| strcmp(line
, "#list") == 0) {
784 char *addr
= client_addr(f_in
);
785 char *host
= client_name(f_in
);
786 rprintf(FLOG
, "module-list request from %s (%s)\n",
793 /* it's some sort of command that I don't understand */
794 io_printf(f_out
, "@ERROR: Unknown command '%s'\n", line
);
798 if ((i
= lp_number(line
)) < 0) {
799 char *addr
= client_addr(f_in
);
800 char *host
= client_name(f_in
);
801 rprintf(FLOG
, "unknown module '%s' tried from %s (%s)\n",
803 io_printf(f_out
, "@ERROR: Unknown module '%s'\n", line
);
807 #ifdef HAVE_SIGACTION
808 sigact
.sa_flags
= SA_NOCLDSTOP
;
810 SIGACTION(SIGCHLD
, remember_children
);
812 return rsync_module(f_in
, f_out
, i
);
815 int daemon_main(void)
819 if (is_a_socket(STDIN_FILENO
)) {
822 /* we are running via inetd - close off stdout and
823 * stderr so that library functions (and getopt) don't
824 * try to use them. Redirect them to /dev/null */
825 for (i
= 1; i
< 3; i
++) {
827 open("/dev/null", O_RDWR
);
830 return start_daemon(STDIN_FILENO
, STDIN_FILENO
);
836 if (!lp_load(config_file
, 1))
837 exit_cleanup(RERR_SYNTAX
);
839 if (rsync_port
== 0 && (rsync_port
= lp_rsync_port()) == 0)
840 rsync_port
= RSYNC_PORT
;
841 if (bind_address
== NULL
&& *lp_bind_address())
842 bind_address
= lp_bind_address();
846 rprintf(FLOG
, "rsyncd version %s starting, listening on port %d\n",
847 RSYNC_VERSION
, rsync_port
);
848 /* TODO: If listening on a particular address, then show that
849 * address too. In fact, why not just do inet_ntop on the
850 * local address??? */
852 if (((pid_file
= lp_pid_file()) != NULL
) && (*pid_file
!= '\0')) {
855 pid_t pid
= getpid();
856 cleanup_set_pid(pid
);
857 if ((fd
= do_open(lp_pid_file(), O_WRONLY
|O_CREAT
|O_TRUNC
,
858 0666 & ~orig_umask
)) == -1) {
860 rsyserr(FLOG
, errno
, "failed to create pid file %s",
862 exit_cleanup(RERR_FILEIO
);
864 snprintf(pidbuf
, sizeof pidbuf
, "%ld\n", (long)pid
);
865 write(fd
, pidbuf
, strlen(pidbuf
));
869 start_accept_loop(rsync_port
, start_daemon
);