Document the new "log format" options: %M (modtime), %U (uid),
[rsync/rsync.git] / clientserver.c
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1/* -*- c-file-style: "linux"; -*-
2 *
3 * Copyright (C) 1998-2001 by Andrew Tridgell <tridge@samba.org>
4 * Copyright (C) 2001-2002 by Martin Pool <mbp@samba.org>
5 *
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.
10 *
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.
15 *
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.
19 */
20
21/**
22 * @file
23 *
24 * The socket based protocol for setting up a connection with
25 * rsyncd.
26 **/
27
28#include "rsync.h"
29
30extern int verbose;
31extern int quiet;
32extern int list_only;
33extern int am_sender;
34extern int am_server;
35extern int am_daemon;
36extern int am_root;
37extern int rsync_port;
38extern int kluge_around_eof;
39extern int daemon_over_rsh;
40extern int sanitize_paths;
41extern int filesfrom_fd;
42extern int remote_protocol;
43extern int protocol_version;
44extern int io_timeout;
45extern int orig_umask;
46extern int no_detach;
47extern int default_af_hint;
48extern char *bind_address;
49extern char *sockopts;
50extern char *config_file;
51extern char *files_from;
52extern char *tmpdir;
53extern struct chmod_mode_struct *chmod_modes;
54extern struct filter_list_struct server_filter_list;
55
56char *auth_user;
57int read_only = 0;
58int daemon_log_format_has_i = 0;
59int daemon_log_format_has_o_or_i = 0;
60int module_id = -1;
61
62/* Length of lp_path() string when in daemon mode & not chrooted, else 0. */
63unsigned int module_dirlen = 0;
64
65/**
66 * Run a client connected to an rsyncd. The alternative to this
67 * function for remote-shell connections is do_cmd().
68 *
69 * After negotiating which module to use and reading the server's
70 * motd, this hands over to client_run(). Telling the server the
71 * module will cause it to chroot/setuid/etc.
72 *
73 * Instead of doing a transfer, the client may at this stage instead
74 * get a listing of remote modules and exit.
75 *
76 * @return -1 for error in startup, or the result of client_run().
77 * Either way, it eventually gets passed to exit_cleanup().
78 **/
79int start_socket_client(char *host, char *path, int argc, char *argv[])
80{
81 int fd, ret;
82 char *p, *user = NULL;
83
84 /* This is redundant with code in start_inband_exchange(), but this
85 * short-circuits a problem in the client before we open a socket,
86 * and the extra check won't hurt. */
87 if (*path == '/') {
88 rprintf(FERROR,
89 "ERROR: The remote path must start with a module name not a /\n");
90 return -1;
91 }
92
93 if ((p = strrchr(host, '@')) != NULL) {
94 user = host;
95 host = p+1;
96 *p = '\0';
97 }
98
99 fd = open_socket_out_wrapped(host, rsync_port, bind_address,
100 default_af_hint);
101 if (fd == -1)
102 exit_cleanup(RERR_SOCKETIO);
103
104 set_socket_options(fd, sockopts);
105
106 ret = start_inband_exchange(user, path, fd, fd, argc);
107
108 return ret ? ret : client_run(fd, fd, -1, argc, argv);
109}
110
111int start_inband_exchange(char *user, char *path, int f_in, int f_out,
112 int argc)
113{
114 int i;
115 char *sargs[MAX_ARGS];
116 int sargc = 0;
117 char line[BIGPATHBUFLEN];
118 char *p;
119
120 if (argc == 0 && !am_sender)
121 list_only |= 1;
122
123 if (*path == '/') {
124 rprintf(FERROR,
125 "ERROR: The remote path must start with a module name\n");
126 return -1;
127 }
128
129 if (!user)
130 user = getenv("USER");
131 if (!user)
132 user = getenv("LOGNAME");
133
134 io_printf(f_out, "@RSYNCD: %d\n", protocol_version);
135
136 if (!read_line(f_in, line, sizeof line - 1)) {
137 rprintf(FERROR, "rsync: did not see server greeting\n");
138 return -1;
139 }
140
141 if (sscanf(line,"@RSYNCD: %d", &remote_protocol) != 1) {
142 /* note that read_line strips of \n or \r */
143 rprintf(FERROR, "rsync: server sent \"%s\" rather than greeting\n",
144 line);
145 return -1;
146 }
147 if (protocol_version > remote_protocol)
148 protocol_version = remote_protocol;
149
150 if (list_only && protocol_version >= 29)
151 list_only |= 2;
152
153 /* set daemon_over_rsh to false since we need to build the
154 * true set of args passed through the rsh/ssh connection;
155 * this is a no-op for direct-socket-connection mode */
156 daemon_over_rsh = 0;
157 server_options(sargs, &sargc);
158
159 sargs[sargc++] = ".";
160
161 if (path && *path)
162 sargs[sargc++] = path;
163
164 sargs[sargc] = NULL;
165
166 if (verbose > 1)
167 print_child_argv(sargs);
168
169 p = strchr(path,'/');
170 if (p) *p = 0;
171 io_printf(f_out, "%s\n", path);
172 if (p) *p = '/';
173
174 /* Old servers may just drop the connection here,
175 rather than sending a proper EXIT command. Yuck. */
176 kluge_around_eof = list_only && protocol_version < 25 ? 1 : 0;
177
178 while (1) {
179 if (!read_line(f_in, line, sizeof line - 1)) {
180 rprintf(FERROR, "rsync: didn't get server startup line\n");
181 return -1;
182 }
183
184 if (strncmp(line,"@RSYNCD: AUTHREQD ",18) == 0) {
185 auth_client(f_out, user, line+18);
186 continue;
187 }
188
189 if (strcmp(line,"@RSYNCD: OK") == 0)
190 break;
191
192 if (strcmp(line,"@RSYNCD: EXIT") == 0) {
193 /* This is sent by recent versions of the
194 * server to terminate the listing of modules.
195 * We don't want to go on and transfer
196 * anything; just exit. */
197 exit(0);
198 }
199
200 if (strncmp(line, "@ERROR", 6) == 0) {
201 rprintf(FERROR, "%s\n", line);
202 /* This is always fatal; the server will now
203 * close the socket. */
204 return -1;
205 }
206
207 rprintf(FINFO, "%s\n", line);
208 }
209 kluge_around_eof = 0;
210
211 for (i = 0; i < sargc; i++) {
212 io_printf(f_out, "%s\n", sargs[i]);
213 }
214 io_printf(f_out, "\n");
215
216 if (protocol_version < 23) {
217 if (protocol_version == 22 || !am_sender)
218 io_start_multiplex_in();
219 }
220
221 return 0;
222}
223
224static char *finish_pre_exec(pid_t pid, int fd, char *request,
225 int argc, char *argv[])
226{
227 int j, status = -1;
228
229 if (request) {
230 write_buf(fd, request, strlen(request)+1);
231 for (j = 0; j < argc; j++)
232 write_buf(fd, argv[j], strlen(argv[j])+1);
233 }
234
235 write_byte(fd, 0);
236
237 close(fd);
238
239 if (wait_process(pid, &status, 0) < 0
240 || !WIFEXITED(status) || WEXITSTATUS(status) != 0) {
241 char *e;
242 if (asprintf(&e, "pre-xfer exec returned failure (%d)\n", status) < 0)
243 out_of_memory("finish_pre_exec");
244 return e;
245 }
246 return NULL;
247}
248
249static int read_arg_from_pipe(int fd, char *buf, int limit)
250{
251 char *bp = buf, *eob = buf + limit - 1;
252
253 while (1) {
254 if (read(fd, bp, 1) != 1)
255 return -1;
256 if (*bp == '\0')
257 break;
258 if (bp < eob)
259 bp++;
260 }
261 *bp = '\0';
262
263 return bp - buf;
264}
265
266static int rsync_module(int f_in, int f_out, int i)
267{
268 int argc = 0;
269 int maxargs;
270 char **argv;
271 char line[BIGPATHBUFLEN];
272 uid_t uid = (uid_t)-2; /* canonically "nobody" */
273 gid_t gid = (gid_t)-2;
274 char *p, *err_msg = NULL;
275 char *addr = client_addr(f_in);
276 char *host = client_name(f_in);
277 char *name = lp_name(i);
278 int use_chroot = lp_use_chroot(i);
279 int start_glob = 0;
280 int ret, pre_exec_fd = -1;
281 pid_t pre_exec_pid = 0;
282 char *request = NULL;
283
284 if (!allow_access(addr, host, lp_hosts_allow(i), lp_hosts_deny(i))) {
285 rprintf(FLOG, "rsync denied on module %s from %s (%s)\n",
286 name, host, addr);
287 if (!lp_list(i))
288 io_printf(f_out, "@ERROR: Unknown module '%s'\n", name);
289 else {
290 io_printf(f_out,
291 "@ERROR: access denied to %s from %s (%s)\n",
292 name, host, addr);
293 }
294 return -1;
295 }
296
297 if (am_daemon && am_server) {
298 rprintf(FLOG, "rsync allowed access on module %s from %s (%s)\n",
299 name, host, addr);
300 }
301
302 if (!claim_connection(lp_lock_file(i), lp_max_connections(i))) {
303 if (errno) {
304 rsyserr(FLOG, errno, "failed to open lock file %s",
305 lp_lock_file(i));
306 io_printf(f_out, "@ERROR: failed to open lock file\n");
307 } else {
308 rprintf(FLOG, "max connections (%d) reached\n",
309 lp_max_connections(i));
310 io_printf(f_out, "@ERROR: max connections (%d) reached -- try again later\n",
311 lp_max_connections(i));
312 }
313 return -1;
314 }
315
316 auth_user = auth_server(f_in, f_out, i, host, addr, "@RSYNCD: AUTHREQD ");
317
318 if (!auth_user) {
319 io_printf(f_out, "@ERROR: auth failed on module %s\n", name);
320 return -1;
321 }
322
323 module_id = i;
324
325 if (lp_read_only(i))
326 read_only = 1;
327
328 if (lp_transfer_logging(i)) {
329 if (log_format_has(lp_log_format(i), 'i'))
330 daemon_log_format_has_i = 1;
331 if (daemon_log_format_has_i
332 || log_format_has(lp_log_format(i), 'o'))
333 daemon_log_format_has_o_or_i = 1;
334 }
335
336 am_root = (MY_UID() == 0);
337
338 if (am_root) {
339 p = lp_uid(i);
340 if (!name_to_uid(p, &uid)) {
341 if (!isdigit(*(unsigned char *)p)) {
342 rprintf(FLOG, "Invalid uid %s\n", p);
343 io_printf(f_out, "@ERROR: invalid uid %s\n", p);
344 return -1;
345 }
346 uid = atoi(p);
347 }
348
349 p = lp_gid(i);
350 if (!name_to_gid(p, &gid)) {
351 if (!isdigit(*(unsigned char *)p)) {
352 rprintf(FLOG, "Invalid gid %s\n", p);
353 io_printf(f_out, "@ERROR: invalid gid %s\n", p);
354 return -1;
355 }
356 gid = atoi(p);
357 }
358 }
359
360 /* TODO: If we're not root, but the configuration requests
361 * that we change to some uid other than the current one, then
362 * log a warning. */
363
364 /* TODO: Perhaps take a list of gids, and make them into the
365 * supplementary groups. */
366
367 if (use_chroot || (module_dirlen = strlen(lp_path(i))) == 1) {
368 module_dirlen = 0;
369 set_filter_dir("/", 1);
370 } else
371 set_filter_dir(lp_path(i), module_dirlen);
372
373 p = lp_filter(i);
374 parse_rule(&server_filter_list, p, MATCHFLG_WORD_SPLIT,
375 XFLG_ABS_IF_SLASH);
376
377 p = lp_include_from(i);
378 parse_filter_file(&server_filter_list, p, MATCHFLG_INCLUDE,
379 XFLG_ABS_IF_SLASH | XFLG_OLD_PREFIXES | XFLG_FATAL_ERRORS);
380
381 p = lp_include(i);
382 parse_rule(&server_filter_list, p,
383 MATCHFLG_INCLUDE | MATCHFLG_WORD_SPLIT,
384 XFLG_ABS_IF_SLASH | XFLG_OLD_PREFIXES);
385
386 p = lp_exclude_from(i);
387 parse_filter_file(&server_filter_list, p, 0,
388 XFLG_ABS_IF_SLASH | XFLG_OLD_PREFIXES | XFLG_FATAL_ERRORS);
389
390 p = lp_exclude(i);
391 parse_rule(&server_filter_list, p, MATCHFLG_WORD_SPLIT,
392 XFLG_ABS_IF_SLASH | XFLG_OLD_PREFIXES);
393
394 log_init();
395
396#ifdef HAVE_PUTENV
397 if (*lp_prexfer_exec(i) || *lp_postxfer_exec(i)) {
398 char *modname, *modpath, *hostaddr, *hostname, *username;
399 int status;
400 if (asprintf(&modname, "RSYNC_MODULE_NAME=%s", name) < 0
401 || asprintf(&modpath, "RSYNC_MODULE_PATH=%s", lp_path(i)) < 0
402 || asprintf(&hostaddr, "RSYNC_HOST_ADDR=%s", addr) < 0
403 || asprintf(&hostname, "RSYNC_HOST_NAME=%s", host) < 0
404 || asprintf(&username, "RSYNC_USER_NAME=%s", auth_user) < 0)
405 out_of_memory("rsync_module");
406 putenv(modname);
407 putenv(modpath);
408 putenv(hostaddr);
409 putenv(hostname);
410 putenv(username);
411 umask(orig_umask);
412 /* For post-xfer exec, fork a new process to run the rsync
413 * daemon while this process waits for the exit status and
414 * runs the indicated command at that point. */
415 if (*lp_postxfer_exec(i)) {
416 pid_t pid = fork();
417 if (pid < 0) {
418 rsyserr(FLOG, errno, "fork failed");
419 io_printf(f_out, "@ERROR: fork failed\n");
420 return -1;
421 }
422 if (pid) {
423 char *ret1, *ret2;
424 if (wait_process(pid, &status, 0) < 0)
425 status = -1;
426 if (asprintf(&ret1, "RSYNC_RAW_STATUS=%d", status) > 0)
427 putenv(ret1);
428 if (WIFEXITED(status))
429 status = WEXITSTATUS(status);
430 else
431 status = -1;
432 if (asprintf(&ret2, "RSYNC_EXIT_STATUS=%d", status) > 0)
433 putenv(ret2);
434 system(lp_postxfer_exec(i));
435 _exit(status);
436 }
437 }
438 /* For pre-xfer exec, fork a child process to run the indicated
439 * command, though it first waits for the parent process to
440 * send us the user's request via a pipe. */
441 if (*lp_prexfer_exec(i)) {
442 int fds[2];
443 if (pipe(fds) < 0 || (pre_exec_pid = fork()) < 0) {
444 rsyserr(FLOG, errno, "pre-xfer exec preparation failed");
445 io_printf(f_out, "@ERROR: pre-xfer exec preparation failed\n");
446 return -1;
447 }
448 if (pre_exec_pid == 0) {
449 char buf[BIGPATHBUFLEN];
450 int j, len;
451 close(fds[1]);
452 set_blocking(fds[0]);
453 len = read_arg_from_pipe(fds[0], buf, BIGPATHBUFLEN);
454 if (len <= 0)
455 _exit(1);
456 if (asprintf(&p, "RSYNC_REQUEST=%s", buf) < 0)
457 out_of_memory("rsync_module");
458 putenv(p);
459 for (j = 0; ; j++) {
460 len = read_arg_from_pipe(fds[0], buf,
461 BIGPATHBUFLEN);
462 if (len <= 0) {
463 if (!len)
464 break;
465 _exit(1);
466 }
467 if (asprintf(&p, "RSYNC_ARG%d=%s", j, buf) < 0)
468 out_of_memory("rsync_module");
469 putenv(p);
470 }
471 close(fds[0]);
472 close(STDIN_FILENO);
473 close(STDOUT_FILENO);
474 status = system(lp_prexfer_exec(i));
475 if (!WIFEXITED(status))
476 _exit(1);
477 _exit(WEXITSTATUS(status));
478 }
479 close(fds[0]);
480 set_blocking(fds[1]);
481 pre_exec_fd = fds[1];
482 }
483 umask(0);
484 }
485#endif
486
487 if (use_chroot) {
488 /*
489 * XXX: The 'use chroot' flag is a fairly reliable
490 * source of confusion, because it fails under two
491 * important circumstances: running as non-root,
492 * running on Win32 (or possibly others). On the
493 * other hand, if you are running as root, then it
494 * might be better to always use chroot.
495 *
496 * So, perhaps if we can't chroot we should just issue
497 * a warning, unless a "require chroot" flag is set,
498 * in which case we fail.
499 */
500 if (chroot(lp_path(i))) {
501 rsyserr(FLOG, errno, "chroot %s failed",
502 lp_path(i));
503 io_printf(f_out, "@ERROR: chroot failed\n");
504 return -1;
505 }
506
507 if (!push_dir("/")) {
508 rsyserr(FLOG, errno, "chdir %s failed\n",
509 lp_path(i));
510 io_printf(f_out, "@ERROR: chdir failed\n");
511 return -1;
512 }
513
514 } else {
515 if (!push_dir(lp_path(i))) {
516 rsyserr(FLOG, errno, "chdir %s failed\n",
517 lp_path(i));
518 io_printf(f_out, "@ERROR: chdir failed\n");
519 return -1;
520 }
521 sanitize_paths = 1;
522 }
523
524 if (am_root) {
525 /* XXXX: You could argue that if the daemon is started
526 * by a non-root user and they explicitly specify a
527 * gid, then we should try to change to that gid --
528 * this could be possible if it's already in their
529 * supplementary groups. */
530
531 /* TODO: Perhaps we need to document that if rsyncd is
532 * started by somebody other than root it will inherit
533 * all their supplementary groups. */
534
535 if (setgid(gid)) {
536 rsyserr(FLOG, errno, "setgid %d failed", (int)gid);
537 io_printf(f_out, "@ERROR: setgid failed\n");
538 return -1;
539 }
540#ifdef HAVE_SETGROUPS
541 /* Get rid of any supplementary groups this process
542 * might have inheristed. */
543 if (setgroups(1, &gid)) {
544 rsyserr(FLOG, errno, "setgroups failed");
545 io_printf(f_out, "@ERROR: setgroups failed\n");
546 return -1;
547 }
548#endif
549
550 if (setuid(uid)) {
551 rsyserr(FLOG, errno, "setuid %d failed", (int)uid);
552 io_printf(f_out, "@ERROR: setuid failed\n");
553 return -1;
554 }
555
556 am_root = (MY_UID() == 0);
557 }
558
559 if (lp_temp_dir(i) && *lp_temp_dir(i)) {
560 tmpdir = lp_temp_dir(i);
561 if (strlen(tmpdir) >= MAXPATHLEN - 10) {
562 rprintf(FLOG,
563 "the 'temp dir' value for %s is WAY too long -- ignoring.\n",
564 name);
565 tmpdir = NULL;
566 }
567 }
568
569 io_printf(f_out, "@RSYNCD: OK\n");
570
571 maxargs = MAX_ARGS;
572 if (!(argv = new_array(char *, maxargs)))
573 out_of_memory("rsync_module");
574 argv[argc++] = "rsyncd";
575
576 while (1) {
577 if (!read_line(f_in, line, sizeof line - 1))
578 return -1;
579
580 if (!*line)
581 break;
582
583 p = line;
584
585 if (argc == maxargs) {
586 maxargs += MAX_ARGS;
587 if (!(argv = realloc_array(argv, char *, maxargs)))
588 out_of_memory("rsync_module");
589 }
590 if (!(argv[argc] = strdup(p)))
591 out_of_memory("rsync_module");
592
593 switch (start_glob) {
594 case 0:
595 argc++;
596 if (strcmp(line, ".") == 0)
597 start_glob = 1;
598 break;
599 case 1:
600 if (pre_exec_pid) {
601 err_msg = finish_pre_exec(pre_exec_pid,
602 pre_exec_fd, p,
603 argc, argv);
604 pre_exec_pid = 0;
605 }
606 request = strdup(p);
607 start_glob = 2;
608 /* FALL THROUGH */
609 default:
610 if (!err_msg)
611 glob_expand(name, &argv, &argc, &maxargs);
612 break;
613 }
614 }
615
616 if (pre_exec_pid) {
617 err_msg = finish_pre_exec(pre_exec_pid, pre_exec_fd, request,
618 argc, argv);
619 }
620
621 verbose = 0; /* future verbosity is controlled by client options */
622 ret = parse_arguments(&argc, (const char ***) &argv, 0);
623 quiet = 0; /* Don't let someone try to be tricky. */
624
625 if (filesfrom_fd == 0)
626 filesfrom_fd = f_in;
627
628 if (request) {
629 if (*auth_user) {
630 rprintf(FLOG, "rsync %s %s from %s@%s (%s)\n",
631 am_sender ? "on" : "to",
632 request, auth_user, host, addr);
633 } else {
634 rprintf(FLOG, "rsync %s %s from %s (%s)\n",
635 am_sender ? "on" : "to",
636 request, host, addr);
637 }
638 free(request);
639 }
640
641#ifndef DEBUG
642 /* don't allow the logs to be flooded too fast */
643 if (verbose > lp_max_verbosity(i))
644 verbose = lp_max_verbosity(i);
645#endif
646
647 if (protocol_version < 23
648 && (protocol_version == 22 || am_sender))
649 io_start_multiplex_out();
650 else if (!ret || err_msg) {
651 /* We have to get I/O multiplexing started so that we can
652 * get the error back to the client. This means getting
653 * the protocol setup finished first in later versions. */
654 setup_protocol(f_out, f_in);
655 if (!am_sender) {
656 /* Since we failed in our option parsing, we may not
657 * have finished parsing that the client sent us a
658 * --files-from option, so look for it manually.
659 * Without this, the socket would be in the wrong
660 * state for the upcoming error message. */
661 if (!files_from) {
662 int i;
663 for (i = 0; i < argc; i++) {
664 if (strncmp(argv[i], "--files-from", 12) == 0) {
665 files_from = "";
666 break;
667 }
668 }
669 }
670 if (files_from)
671 write_byte(f_out, 0);
672 }
673 io_start_multiplex_out();
674 }
675
676 if (!ret || err_msg) {
677 if (err_msg)
678 rprintf(FERROR, err_msg);
679 else
680 option_error();
681 msleep(400);
682 exit_cleanup(RERR_UNSUPPORTED);
683 }
684
685 if (lp_timeout(i) && lp_timeout(i) > io_timeout)
686 set_io_timeout(lp_timeout(i));
687
688
689 if (am_sender)
690 p = lp_outgoing_chmod(i);
691 else
692 p = lp_incoming_chmod(i);
693 if (*p && !parse_chmod(p, &chmod_modes)) {
694 rprintf(FLOG, "Invalid \"%sing chmod\" directive: %s\n",
695 am_sender ? "outgo" : "incom", p);
696 }
697
698 start_server(f_in, f_out, argc, argv);
699
700 return 0;
701}
702
703/* send a list of available modules to the client. Don't list those
704 with "list = False". */
705static void send_listing(int fd)
706{
707 int n = lp_numservices();
708 int i;
709
710 for (i = 0; i < n; i++) {
711 if (lp_list(i))
712 io_printf(fd, "%-15s\t%s\n", lp_name(i), lp_comment(i));
713 }
714
715 if (protocol_version >= 25)
716 io_printf(fd,"@RSYNCD: EXIT\n");
717}
718
719/* this is called when a connection is established to a client
720 and we want to start talking. The setup of the system is done from
721 here */
722int start_daemon(int f_in, int f_out)
723{
724 char line[1024];
725 char *motd;
726 int i;
727
728 io_set_sock_fds(f_in, f_out);
729
730 if (!lp_load(config_file, 0))
731 exit_cleanup(RERR_SYNTAX);
732
733 log_init();
734
735 if (!am_server) {
736 set_socket_options(f_in, "SO_KEEPALIVE");
737 if (sockopts)
738 set_socket_options(f_in, sockopts);
739 else
740 set_socket_options(f_in, lp_socket_options());
741 set_nonblocking(f_in);
742 }
743
744 io_printf(f_out, "@RSYNCD: %d\n", protocol_version);
745
746 motd = lp_motd_file();
747 if (motd && *motd) {
748 FILE *f = fopen(motd,"r");
749 while (f && !feof(f)) {
750 int len = fread(line, 1, sizeof line - 1, f);
751 if (len > 0) {
752 line[len] = 0;
753 io_printf(f_out, "%s", line);
754 }
755 }
756 if (f)
757 fclose(f);
758 io_printf(f_out, "\n");
759 }
760
761 if (!read_line(f_in, line, sizeof line - 1))
762 return -1;
763
764 if (sscanf(line,"@RSYNCD: %d", &remote_protocol) != 1) {
765 io_printf(f_out, "@ERROR: protocol startup error\n");
766 return -1;
767 }
768 if (protocol_version > remote_protocol)
769 protocol_version = remote_protocol;
770
771 line[0] = 0;
772 if (!read_line(f_in, line, sizeof line - 1))
773 return -1;
774
775 if (!*line || strcmp(line, "#list") == 0) {
776 send_listing(f_out);
777 return -1;
778 }
779
780 if (*line == '#') {
781 /* it's some sort of command that I don't understand */
782 io_printf(f_out, "@ERROR: Unknown command '%s'\n", line);
783 return -1;
784 }
785
786 if ((i = lp_number(line)) < 0) {
787 char *addr = client_addr(f_in);
788 char *host = client_name(f_in);
789 rprintf(FLOG, "unknown module '%s' tried from %s (%s)\n",
790 line, host, addr);
791 io_printf(f_out, "@ERROR: Unknown module '%s'\n", line);
792 return -1;
793 }
794
795 return rsync_module(f_in, f_out, i);
796}
797
798int daemon_main(void)
799{
800 char *pid_file;
801
802 if (is_a_socket(STDIN_FILENO)) {
803 int i;
804
805 /* we are running via inetd - close off stdout and
806 * stderr so that library functions (and getopt) don't
807 * try to use them. Redirect them to /dev/null */
808 for (i = 1; i < 3; i++) {
809 close(i);
810 open("/dev/null", O_RDWR);
811 }
812
813 return start_daemon(STDIN_FILENO, STDIN_FILENO);
814 }
815
816 if (!no_detach)
817 become_daemon();
818
819 if (!lp_load(config_file, 1))
820 exit_cleanup(RERR_SYNTAX);
821
822 if (rsync_port == 0 && (rsync_port = lp_rsync_port()) == 0)
823 rsync_port = RSYNC_PORT;
824 if (bind_address == NULL && *lp_bind_address())
825 bind_address = lp_bind_address();
826
827 log_init();
828
829 rprintf(FLOG, "rsyncd version %s starting, listening on port %d\n",
830 RSYNC_VERSION, rsync_port);
831 /* TODO: If listening on a particular address, then show that
832 * address too. In fact, why not just do inet_ntop on the
833 * local address??? */
834
835 if (((pid_file = lp_pid_file()) != NULL) && (*pid_file != '\0')) {
836 char pidbuf[16];
837 int fd;
838 pid_t pid = getpid();
839 cleanup_set_pid(pid);
840 if ((fd = do_open(lp_pid_file(), O_WRONLY|O_CREAT|O_TRUNC,
841 0666 & ~orig_umask)) == -1) {
842 cleanup_set_pid(0);
843 rsyserr(FLOG, errno, "failed to create pid file %s",
844 pid_file);
845 exit_cleanup(RERR_FILEIO);
846 }
847 snprintf(pidbuf, sizeof pidbuf, "%ld\n", (long)pid);
848 write(fd, pidbuf, strlen(pidbuf));
849 close(fd);
850 }
851
852 start_accept_loop(rsync_port, start_daemon);
853 return -1;
854}