[rsync/rsync.git] / clientserver.c

/* 
   Copyright (C) Andrew Tridgell 1998
   
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.
   
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
   
   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

/* the socket based protocol for setting up a connection wit rsyncd */

#include "rsync.h"

extern int module_id;
extern int read_only;
extern int verbose;
extern int rsync_port;
char *auth_user;
int sanitize_paths = 0;

int start_socket_client(char *host, char *path, int argc, char *argv[])
{
	int fd, i;
	char *sargs[MAX_ARGS];
	int sargc=0;
	char line[MAXPATHLEN];
	char *p, *user=NULL;
	extern int remote_version;
	extern int am_sender;
	extern struct in_addr socket_address;

	if (*path == '/') {
		rprintf(FERROR,"ERROR: The remote path must start with a module name\n");
		return -1;
	}

	p = strchr(host, '@');
	if (p) {
		user = host;
		host = p+1;
		*p = 0;
	}

	if (!user) user = getenv("USER");
	if (!user) user = getenv("LOGNAME");

	fd = open_socket_out(host, rsync_port, &socket_address);
	if (fd == -1) {
		exit_cleanup(RERR_SOCKETIO);
	}
	
	server_options(sargs,&sargc);

	sargs[sargc++] = ".";

	if (path && *path) 
		sargs[sargc++] = path;

	sargs[sargc] = NULL;

	io_printf(fd,"@RSYNCD: %d\n", PROTOCOL_VERSION);

	if (!read_line(fd, line, sizeof(line)-1)) {
		return -1;
	}

	if (sscanf(line,"@RSYNCD: %d", &remote_version) != 1) {
		return -1;
	}

	p = strchr(path,'/');
	if (p) *p = 0;
	io_printf(fd,"%s\n",path);
	if (p) *p = '/';

	while (1) {
		if (!read_line(fd, line, sizeof(line)-1)) {
			return -1;
		}

		if (strncmp(line,"@RSYNCD: AUTHREQD ",18) == 0) {
			auth_client(fd, user, line+18);
			continue;
		}

		if (strcmp(line,"@RSYNCD: OK") == 0) break;
		rprintf(FINFO,"%s\n", line);
	}

	for (i=0;i<sargc;i++) {
		io_printf(fd,"%s\n", sargs[i]);
	}
	io_printf(fd,"\n");

	if (remote_version < 23) {
		if (remote_version == 22 || (remote_version > 17 && !am_sender))
			io_start_multiplex_in(fd);
	}

	return client_run(fd, fd, -1, argc, argv);
}


static int rsync_module(int fd, int i)
{
	int argc=0;
	char *argv[MAX_ARGS];
	char **argp;
	char line[MAXPATHLEN];
	uid_t uid = (uid_t)-2;
	gid_t gid = (gid_t)-2;
	char *p;
	char *addr = client_addr(fd);
	char *host = client_name(fd);
	char *name = lp_name(i);
	int use_chroot = lp_use_chroot(i);
	int start_glob=0;
	int ret;
	char *request=NULL;
	extern int am_sender;
	extern int remote_version;
	extern int am_root;

	if (!allow_access(addr, host, lp_hosts_allow(i), lp_hosts_deny(i))) {
		rprintf(FERROR,"rsync denied on module %s from %s (%s)\n",
			name, client_name(fd), client_addr(fd));
		io_printf(fd,"@ERROR: access denied to %s from %s (%s)\n",
			  name, client_name(fd), client_addr(fd));
		return -1;
	}

	if (!claim_connection(lp_lock_file(i), lp_max_connections(i))) {
		if (errno) {
			rprintf(FERROR,"failed to open lock file %s : %s\n",
				lp_lock_file(i), strerror(errno));
			io_printf(fd,"@ERROR: failed to open lock file %s : %s\n",
				  lp_lock_file(i), strerror(errno));
		} else {
			rprintf(FERROR,"max connections (%d) reached\n",
				lp_max_connections(i));
			io_printf(fd,"@ERROR: max connections (%d) reached - try again later\n", lp_max_connections(i));
		}
		return -1;
	}

	
	auth_user = auth_server(fd, i, addr, "@RSYNCD: AUTHREQD ");

	if (!auth_user) {
		rprintf(FERROR,"auth failed on module %s from %s (%s)\n",
			name, client_name(fd), client_addr(fd));
		io_printf(fd,"@ERROR: auth failed on module %s\n",name);
		return -1;		
	}

	module_id = i;

	am_root = (getuid() == 0);

	if (am_root) {
		p = lp_uid(i);
		if (!name_to_uid(p, &uid)) {
			if (!isdigit(*p)) {
				rprintf(FERROR,"Invalid uid %s\n", p);
				io_printf(fd,"@ERROR: invalid uid\n");
				return -1;
			} 
			uid = atoi(p);
		}

		p = lp_gid(i);
		if (!name_to_gid(p, &gid)) {
			if (!isdigit(*p)) {
				rprintf(FERROR,"Invalid gid %s\n", p);
				io_printf(fd,"@ERROR: invalid gid\n");
				return -1;
			} 
			gid = atoi(p);
		}
	}

	p = lp_include_from(i);
	add_exclude_file(p, 1, 1);

	p = lp_include(i);
	add_include_line(p);

	p = lp_exclude_from(i);
	add_exclude_file(p, 1, 0);

	p = lp_exclude(i);
	add_exclude_line(p);

	log_open();

	if (use_chroot) {
		if (chroot(lp_path(i))) {
			rprintf(FERROR,"chroot %s failed\n", lp_path(i));
			io_printf(fd,"@ERROR: chroot failed\n");
			return -1;
		}

		if (!push_dir("/", 0)) {
			rprintf(FERROR,"chdir %s failed\n", lp_path(i));
			io_printf(fd,"@ERROR: chdir failed\n");
			return -1;
		}

	} else {
		if (!push_dir(lp_path(i), 0)) {
			rprintf(FERROR,"chdir %s failed\n", lp_path(i));
			io_printf(fd,"@ERROR: chdir failed\n");
			return -1;
		}
		sanitize_paths = 1;
	}

	if (am_root) {
		if (setgid(gid)) {
			rprintf(FERROR,"setgid %d failed\n", gid);
			io_printf(fd,"@ERROR: setgid failed\n");
			return -1;
		}

		if (setuid(uid)) {
			rprintf(FERROR,"setuid %d failed\n", uid);
			io_printf(fd,"@ERROR: setuid failed\n");
			return -1;
		}

		am_root = (getuid() == 0);
	}

	io_printf(fd,"@RSYNCD: OK\n");

	argv[argc++] = "rsyncd";

	while (1) {
		if (!read_line(fd, line, sizeof(line)-1)) {
			return -1;
		}

		if (!*line) break;

		p = line;

		argv[argc] = strdup(p);
		if (!argv[argc]) {
			return -1;
		}

		if (start_glob) {
			if (start_glob == 1) {
				request = strdup(p);
				start_glob++;
			}
			glob_expand(name, argv, &argc, MAX_ARGS);
		} else {
			argc++;
		}

		if (strcmp(line,".") == 0) {
			start_glob = 1;
		}

		if (argc == MAX_ARGS) {
			return -1;
		}
	}

	if (sanitize_paths) {
		/*
		 * Note that this is applied to all parameters, whether or not
		 *    they are filenames, but no other legal parameters contain
		 *    the forms that need to be sanitized so it doesn't hurt;
		 *    it is not known at this point which parameters are files
		 *    and which aren't.
		 */
		for (i = 1; i < argc; i++) {
			sanitize_path(argv[i], NULL);
		}
	}

	ret = parse_arguments(argc, argv, 0);

	if (request) {
		if (*auth_user) {
			rprintf(FINFO,"rsync %s %s from %s@%s (%s)\n",
				am_sender?"on":"to",
				request, auth_user, host, addr);
		} else {
			rprintf(FINFO,"rsync %s %s from %s (%s)\n",
				am_sender?"on":"to",
				request, host, addr);
		}
		free(request);
	}

#if !TRIDGE
	/* don't allow the logs to be flooded too fast */
	if (verbose > 1) verbose = 1;
#endif

	argc -= optind;
	argp = argv + optind;
	optind = 0;

	if (remote_version < 23) {
		if (remote_version == 22 || (remote_version > 17 && am_sender))
			io_start_multiplex_out(fd);
	}

	if (!ret) {
		option_error();
	}

	if (lp_timeout(i)) {
		extern int io_timeout;
		io_timeout = lp_timeout(i);
	}

	start_server(fd, fd, argc, argp);

	return 0;
}

/* send a list of available modules to the client. Don't list those
   with "list = False". */
static void send_listing(int fd)
{
	int n = lp_numservices();
	int i;
	
	for (i=0;i<n;i++)
		if (lp_list(i))
		    io_printf(fd, "%-15s\t%s\n", lp_name(i), lp_comment(i));
}

/* this is called when a socket connection is established to a client
   and we want to start talking. The setup of the system is done from
   here */
static int start_daemon(int fd)
{
	char line[200];
	char *motd;
	int i = -1;
	extern char *config_file;
	extern int remote_version;

	if (!lp_load(config_file, 0)) {
		exit_cleanup(RERR_SYNTAX);
	}

	set_socket_options(fd,"SO_KEEPALIVE");
	set_socket_options(fd,lp_socket_options());
	set_nonblocking(fd);

	io_printf(fd,"@RSYNCD: %d\n", PROTOCOL_VERSION);

	motd = lp_motd_file();
	if (motd && *motd) {
		FILE *f = fopen(motd,"r");
		while (f && !feof(f)) {
			int len = fread(line, 1, sizeof(line)-1, f);
			if (len > 0) {
				line[len] = 0;
				io_printf(fd,"%s", line);
			}
		}
		if (f) fclose(f);
		io_printf(fd,"\n");
	}

	if (!read_line(fd, line, sizeof(line)-1)) {
		return -1;
	}

	if (sscanf(line,"@RSYNCD: %d", &remote_version) != 1) {
		io_printf(fd,"@ERROR: protocol startup error\n");
		return -1;
	}	

	while (i == -1) {
		line[0] = 0;
		if (!read_line(fd, line, sizeof(line)-1)) {
			return -1;
		}

		if (!*line || strcmp(line,"#list")==0) {
			send_listing(fd);
			return -1;
		} 

		if (*line == '#') {
			/* it's some sort of command that I don't understand */
			io_printf(fd,"@ERROR: Unknown command '%s'\n", line);
			return -1;
		}

		i = lp_number(line);
		if (i == -1) {
			io_printf(fd,"@ERROR: Unknown module '%s'\n", line);
			return -1;
		}
	}

	return rsync_module(fd, i);
}


int daemon_main(void)
{
	extern char *config_file;
	extern int orig_umask;
	char *pid_file;

	if (is_a_socket(STDIN_FILENO)) {
		int i;

		/* we are running via inetd - close off stdout and
		   stderr so that library functions (and getopt) don't
		   try to use them. Redirect them to /dev/null */
		for (i=1;i<3;i++) {
			close(i); 
			open("/dev/null", O_RDWR);
		}

		return start_daemon(STDIN_FILENO);
	}

	become_daemon();

	if (!lp_load(config_file, 1)) {
		exit_cleanup(RERR_SYNTAX);
	}

	log_open();

	rprintf(FINFO,"rsyncd version %s starting\n",VERSION);

	if (((pid_file = lp_pid_file()) != NULL) && (*pid_file != '\0')) {
		char pidbuf[16];
		int fd;
		int pid = (int) getpid();
		cleanup_set_pid(pid);
		if ((fd = do_open(lp_pid_file(), O_WRONLY|O_CREAT|O_TRUNC,
					0666 & ~orig_umask)) == -1) {
		    cleanup_set_pid(0);
		    rprintf(FLOG,"failed to create pid file %s\n", pid_file);
		    exit_cleanup(RERR_FILEIO);
		}
		slprintf(pidbuf, sizeof(pidbuf), "%d\n", pid);
		write(fd, pidbuf, strlen(pidbuf));
		close(fd);
	}

	start_accept_loop(rsync_port, start_daemon);
	return -1;
}
Commit	Line	Data
3591c066 AT	1	/*
	2	Copyright (C) Andrew Tridgell 1998
	3
	4	This program is free software; you can redistribute it and/or modify
	5	it under the terms of the GNU General Public License as published by
	6	the Free Software Foundation; either version 2 of the License, or
	7	(at your option) any later version.
	8
	9	This program is distributed in the hope that it will be useful,
	10	but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	GNU General Public License for more details.
	13
	14	You should have received a copy of the GNU General Public License
	15	along with this program; if not, write to the Free Software
	16	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	17	*/
	18
	19	/* the socket based protocol for setting up a connection wit rsyncd */
	20
	21	#include "rsync.h"
	22
	23	extern int module_id;
	24	extern int read_only;
	25	extern int verbose;
	26	extern int rsync_port;
97cb8dc2	27	char *auth_user;
cb13abfe	28	int sanitize_paths = 0;
3591c066 AT	29
	30	int start_socket_client(char host, char path, int argc, char *argv[])
	31	{
	32	int fd, i;
	33	char *sargs[MAX_ARGS];
	34	int sargc=0;
e42c9458	35	char line[MAXPATHLEN];
bcb7e502	36	char p, user=NULL;
13c5fc0e	37	extern int remote_version;
8d9dc9f9	38	extern int am_sender;
e30f0657	39	extern struct in_addr socket_address;
3591c066	40
f98df1d9 AT	41	if (*path == '/') {
	42	rprintf(FERROR,"ERROR: The remote path must start with a module name\n");
	43	return -1;
	44	}
	45
bcb7e502 AT	46	p = strchr(host, '@');
	47	if (p) {
	48	user = host;
	49	host = p+1;
	50	*p = 0;
	51	}
	52
	53	if (!user) user = getenv("USER");
	54	if (!user) user = getenv("LOGNAME");
	55
e30f0657	56	fd = open_socket_out(host, rsync_port, &socket_address);
3591c066	57	if (fd == -1) {
65417579	58	exit_cleanup(RERR_SOCKETIO);
3591c066 AT	59	}
	60
	61	server_options(sargs,&sargc);
	62
	63	sargs[sargc++] = ".";
	64
	65	if (path && *path)
	66	sargs[sargc++] = path;
	67
	68	sargs[sargc] = NULL;
	69
91eee594 AT	70	io_printf(fd,"@RSYNCD: %d\n", PROTOCOL_VERSION);
91eee594 AT	71
3591c066 AT	72	if (!read_line(fd, line, sizeof(line)-1)) {
	73	return -1;
	74	}
	75
13c5fc0e	76	if (sscanf(line,"@RSYNCD: %d", &remote_version) != 1) {
3591c066 AT	77	return -1;
	78	}
	79
2c91d3d3 AT	80	p = strchr(path,'/');
	81	if (p) *p = 0;
	82	io_printf(fd,"%s\n",path);
	83	if (p) *p = '/';
	84
3591c066 AT	85	while (1) {
	86	if (!read_line(fd, line, sizeof(line)-1)) {
	87	return -1;
	88	}
31593dd6	89
31593dd6	90	if (strncmp(line,"@RSYNCD: AUTHREQD ",18) == 0) {
bcb7e502	91	auth_client(fd, user, line+18);
31593dd6 AT	92	continue;
31593dd6 AT	93	}
31593dd6	94
3591c066 AT	95	if (strcmp(line,"@RSYNCD: OK") == 0) break;
	96	rprintf(FINFO,"%s\n", line);
	97	}
	98
	99	for (i=0;i<sargc;i++) {
	100	io_printf(fd,"%s\n", sargs[i]);
	101	}
	102	io_printf(fd,"\n");
	103
09b7f5db AT	104	if (remote_version < 23) {
	105	if (remote_version == 22 \|\| (remote_version > 17 && !am_sender))
	106	io_start_multiplex_in(fd);
	107	}
8d9dc9f9	108
3591c066 AT	109	return client_run(fd, fd, -1, argc, argv);
	110	}
	111
	112
	113
	114	static int rsync_module(int fd, int i)
	115	{
	116	int argc=0;
	117	char *argv[MAX_ARGS];
	118	char **argp;
e42c9458	119	char line[MAXPATHLEN];
1a016bfd AT	120	uid_t uid = (uid_t)-2;
1a016bfd AT	121	gid_t gid = (gid_t)-2;
8ef4ffd6	122	char *p;
56c473b7 AT	123	char *addr = client_addr(fd);
56c473b7 AT	124	char *host = client_name(fd);
874895d5	125	char *name = lp_name(i);
8638dd48	126	int use_chroot = lp_use_chroot(i);
874895d5	127	int start_glob=0;
41979ff8	128	int ret;
7b372642 AT	129	char *request=NULL;
7b372642 AT	130	extern int am_sender;
8d9dc9f9	131	extern int remote_version;
943882a2	132	extern int am_root;
56c473b7 AT	133
	134	if (!allow_access(addr, host, lp_hosts_allow(i), lp_hosts_deny(i))) {
	135	rprintf(FERROR,"rsync denied on module %s from %s (%s)\n",
874895d5	136	name, client_name(fd), client_addr(fd));
c8e78d87	137	io_printf(fd,"@ERROR: access denied to %s from %s (%s)\n",
874895d5	138	name, client_name(fd), client_addr(fd));
56c473b7 AT	139	return -1;
56c473b7 AT	140	}
3591c066	141
5e71c444	142	if (!claim_connection(lp_lock_file(i), lp_max_connections(i))) {
8d72ef6e AT	143	if (errno) {
8d72ef6e AT	144	rprintf(FERROR,"failed to open lock file %s : %s\n",
5e71c444	145	lp_lock_file(i), strerror(errno));
8d72ef6e	146	io_printf(fd,"@ERROR: failed to open lock file %s : %s\n",
5e71c444	147	lp_lock_file(i), strerror(errno));
8d72ef6e AT	148	} else {
8d72ef6e AT	149	rprintf(FERROR,"max connections (%d) reached\n",
5e71c444 AT	150	lp_max_connections(i));
5e71c444 AT	151	io_printf(fd,"@ERROR: max connections (%d) reached - try again later\n", lp_max_connections(i));
8d72ef6e	152	}
0c515f17 AT	153	return -1;
	154	}
	155
31593dd6	156
97cb8dc2	157	auth_user = auth_server(fd, i, addr, "@RSYNCD: AUTHREQD ");
d0d56395	158
97cb8dc2	159	if (!auth_user) {
d0d56395 AT	160	rprintf(FERROR,"auth failed on module %s from %s (%s)\n",
	161	name, client_name(fd), client_addr(fd));
	162	io_printf(fd,"@ERROR: auth failed on module %s\n",name);
	163	return -1;
	164	}
	165
3591c066 AT	166	module_id = i;
3591c066 AT	167
716baed7	168	am_root = (getuid() == 0);
8ef4ffd6	169
716baed7 DD	170	if (am_root) {
	171	p = lp_uid(i);
	172	if (!name_to_uid(p, &uid)) {
	173	if (!isdigit(*p)) {
	174	rprintf(FERROR,"Invalid uid %s\n", p);
	175	io_printf(fd,"@ERROR: invalid uid\n");
	176	return -1;
	177	}
	178	uid = atoi(p);
	179	}
	180
	181	p = lp_gid(i);
	182	if (!name_to_gid(p, &gid)) {
	183	if (!isdigit(*p)) {
	184	rprintf(FERROR,"Invalid gid %s\n", p);
	185	io_printf(fd,"@ERROR: invalid gid\n");
	186	return -1;
	187	}
	188	gid = atoi(p);
	189	}
8ef4ffd6 AT	190	}
8ef4ffd6 AT	191
cd64343a DD	192	p = lp_include_from(i);
	193	add_exclude_file(p, 1, 1);
	194
	195	p = lp_include(i);
	196	add_include_line(p);
	197
8f3a2d54	198	p = lp_exclude_from(i);
2b6b4d53	199	add_exclude_file(p, 1, 0);
8f3a2d54	200
5805327b	201	p = lp_exclude(i);
8f3a2d54 AT	202	add_exclude_line(p);
8f3a2d54 AT	203
1a016bfd AT	204	log_open();
1a016bfd AT	205
8638dd48 DD	206	if (use_chroot) {
	207	if (chroot(lp_path(i))) {
	208	rprintf(FERROR,"chroot %s failed\n", lp_path(i));
	209	io_printf(fd,"@ERROR: chroot failed\n");
	210	return -1;
	211	}
3591c066	212
c226b7c2	213	if (!push_dir("/", 0)) {
8638dd48 DD	214	rprintf(FERROR,"chdir %s failed\n", lp_path(i));
	215	io_printf(fd,"@ERROR: chdir failed\n");
	216	return -1;
	217	}
3591c066	218
716baed7 DD	219	} else {
	220	if (!push_dir(lp_path(i), 0)) {
	221	rprintf(FERROR,"chdir %s failed\n", lp_path(i));
	222	io_printf(fd,"@ERROR: chdir failed\n");
	223	return -1;
	224	}
cb13abfe	225	sanitize_paths = 1;
716baed7 DD	226	}
	227
	228	if (am_root) {
	229	if (setgid(gid)) {
8638dd48 DD	230	rprintf(FERROR,"setgid %d failed\n", gid);
	231	io_printf(fd,"@ERROR: setgid failed\n");
	232	return -1;
	233	}
3591c066	234
716baed7	235	if (setuid(uid)) {
8638dd48 DD	236	rprintf(FERROR,"setuid %d failed\n", uid);
	237	io_printf(fd,"@ERROR: setuid failed\n");
	238	return -1;
	239	}
	240
716baed7	241	am_root = (getuid() == 0);
3591c066 AT	242	}
	243
	244	io_printf(fd,"@RSYNCD: OK\n");
	245
	246	argv[argc++] = "rsyncd";
	247
	248	while (1) {
	249	if (!read_line(fd, line, sizeof(line)-1)) {
	250	return -1;
	251	}
	252
	253	if (!*line) break;
	254
874895d5 AT	255	p = line;
874895d5 AT	256
874895d5	257	argv[argc] = strdup(p);
3591c066 AT	258	if (!argv[argc]) {
	259	return -1;
	260	}
	261
874895d5	262	if (start_glob) {
1a016bfd	263	if (start_glob == 1) {
7b372642	264	request = strdup(p);
1a016bfd AT	265	start_glob++;
1a016bfd AT	266	}
cb13abfe	267	glob_expand(name, argv, &argc, MAX_ARGS);
874895d5 AT	268	} else {
	269	argc++;
	270	}
	271
	272	if (strcmp(line,".") == 0) {
	273	start_glob = 1;
	274	}
	275
3591c066 AT	276	if (argc == MAX_ARGS) {
	277	return -1;
	278	}
	279	}
	280
cb13abfe	281	if (sanitize_paths) {
8638dd48 DD	282	/*
	283	* Note that this is applied to all parameters, whether or not
	284	* they are filenames, but no other legal parameters contain
	285	* the forms that need to be sanitized so it doesn't hurt;
	286	* it is not known at this point which parameters are files
	287	* and which aren't.
	288	*/
	289	for (i = 1; i < argc; i++) {
cb13abfe	290	sanitize_path(argv[i], NULL);
8638dd48 DD	291	}
	292	}
	293
b86f0cef	294	ret = parse_arguments(argc, argv, 0);
3591c066	295
7b372642	296	if (request) {
97cb8dc2	297	if (*auth_user) {
d0d56395 AT	298	rprintf(FINFO,"rsync %s %s from %s@%s (%s)\n",
d0d56395 AT	299	am_sender?"on":"to",
97cb8dc2	300	request, auth_user, host, addr);
d0d56395 AT	301	} else {
	302	rprintf(FINFO,"rsync %s %s from %s (%s)\n",
	303	am_sender?"on":"to",
	304	request, host, addr);
	305	}
7b372642 AT	306	free(request);
	307	}
	308
0199b05f	309	#if !TRIDGE
3591c066 AT	310	/* don't allow the logs to be flooded too fast */
3591c066 AT	311	if (verbose > 1) verbose = 1;
0199b05f	312	#endif
3591c066 AT	313
	314	argc -= optind;
	315	argp = argv + optind;
	316	optind = 0;
	317
09b7f5db AT	318	if (remote_version < 23) {
	319	if (remote_version == 22 \|\| (remote_version > 17 && am_sender))
	320	io_start_multiplex_out(fd);
554e0a8d AT	321	}
554e0a8d AT	322
41979ff8	323	if (!ret) {
cd8185f2	324	option_error();
41979ff8 AT	325	}
41979ff8 AT	326
81791cfc AT	327	if (lp_timeout(i)) {
	328	extern int io_timeout;
	329	io_timeout = lp_timeout(i);
	330	}
	331
3591c066 AT	332	start_server(fd, fd, argc, argp);
	333
	334	return 0;
	335	}
	336
7a6421fa AT	337	/* send a list of available modules to the client. Don't list those
7a6421fa AT	338	with "list = False". */
3591c066 AT	339	static void send_listing(int fd)
	340	{
	341	int n = lp_numservices();
	342	int i;
	343
	344	for (i=0;i<n;i++)
	345	if (lp_list(i))
	346	io_printf(fd, "%-15s\t%s\n", lp_name(i), lp_comment(i));
	347	}
	348
	349	/* this is called when a socket connection is established to a client
	350	and we want to start talking. The setup of the system is done from
	351	here */
	352	static int start_daemon(int fd)
	353	{
7a6421fa	354	char line[200];
3591c066	355	char *motd;
8ef4ffd6	356	int i = -1;
4cdf25e4	357	extern char *config_file;
13c5fc0e	358	extern int remote_version;
4cdf25e4	359
f9e940ef	360	if (!lp_load(config_file, 0)) {
65417579	361	exit_cleanup(RERR_SYNTAX);
4cdf25e4	362	}
3591c066 AT	363
3591c066 AT	364	set_socket_options(fd,"SO_KEEPALIVE");
a6801c39	365	set_socket_options(fd,lp_socket_options());
f0359dd0	366	set_nonblocking(fd);
3591c066 AT	367
	368	io_printf(fd,"@RSYNCD: %d\n", PROTOCOL_VERSION);
	369
	370	motd = lp_motd_file();
27d3cdbc	371	if (motd && *motd) {
3591c066 AT	372	FILE *f = fopen(motd,"r");
	373	while (f && !feof(f)) {
	374	int len = fread(line, 1, sizeof(line)-1, f);
	375	if (len > 0) {
	376	line[len] = 0;
	377	io_printf(fd,"%s", line);
	378	}
	379	}
	380	if (f) fclose(f);
	381	io_printf(fd,"\n");
	382	}
	383
91eee594 AT	384	if (!read_line(fd, line, sizeof(line)-1)) {
	385	return -1;
	386	}
	387
	388	if (sscanf(line,"@RSYNCD: %d", &remote_version) != 1) {
c8e78d87	389	io_printf(fd,"@ERROR: protocol startup error\n");
91eee594 AT	390	return -1;
	391	}
	392
8ef4ffd6	393	while (i == -1) {
3591c066 AT	394	line[0] = 0;
	395	if (!read_line(fd, line, sizeof(line)-1)) {
	396	return -1;
	397	}
	398
	399	if (!*line \|\| strcmp(line,"#list")==0) {
	400	send_listing(fd);
	401	return -1;
	402	}
	403
	404	if (*line == '#') {
	405	/* it's some sort of command that I don't understand */
c8e78d87	406	io_printf(fd,"@ERROR: Unknown command '%s'\n", line);
3591c066 AT	407	return -1;
	408	}
	409
	410	i = lp_number(line);
	411	if (i == -1) {
c8e78d87	412	io_printf(fd,"@ERROR: Unknown module '%s'\n", line);
3591c066 AT	413	return -1;
3591c066 AT	414	}
3591c066 AT	415	}
3591c066 AT	416
8ef4ffd6	417	return rsync_module(fd, i);
3591c066 AT	418	}
	419
	420
	421	int daemon_main(void)
	422	{
f9e940ef	423	extern char *config_file;
ad517ce5	424	extern int orig_umask;
8638dd48	425	char *pid_file;
1a016bfd	426
3591c066	427	if (is_a_socket(STDIN_FILENO)) {
41979ff8 AT	428	int i;
	429
	430	/* we are running via inetd - close off stdout and
	431	stderr so that library functions (and getopt) don't
	432	try to use them. Redirect them to /dev/null */
	433	for (i=1;i<3;i++) {
	434	close(i);
	435	open("/dev/null", O_RDWR);
	436	}
3eb38818	437
3591c066 AT	438	return start_daemon(STDIN_FILENO);
	439	}
	440
	441	become_daemon();
	442
f9e940ef	443	if (!lp_load(config_file, 1)) {
65417579	444	exit_cleanup(RERR_SYNTAX);
f9e940ef AT	445	}
	446
	447	log_open();
	448
e42c9458 AT	449	rprintf(FINFO,"rsyncd version %s starting\n",VERSION);
e42c9458 AT	450
8638dd48	451	if (((pid_file = lp_pid_file()) != NULL) && (*pid_file != '\0')) {
ad517ce5 DD	452	char pidbuf[16];
ad517ce5 DD	453	int fd;
8638dd48 DD	454	int pid = (int) getpid();
8638dd48 DD	455	cleanup_set_pid(pid);
ad517ce5 DD	456	if ((fd = do_open(lp_pid_file(), O_WRONLY\|O_CREAT\|O_TRUNC,
ad517ce5 DD	457	0666 & ~orig_umask)) == -1) {
8638dd48	458	cleanup_set_pid(0);
8a5d6bba	459	rprintf(FLOG,"failed to create pid file %s\n", pid_file);
65417579	460	exit_cleanup(RERR_FILEIO);
8638dd48	461	}
ad517ce5 DD	462	slprintf(pidbuf, sizeof(pidbuf), "%d\n", pid);
	463	write(fd, pidbuf, strlen(pidbuf));
	464	close(fd);
8638dd48 DD	465	}
8638dd48 DD	466
8ef4ffd6 AT	467	start_accept_loop(rsync_port, start_daemon);
8ef4ffd6 AT	468	return -1;
3591c066 AT	469	}
3591c066 AT	470