[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 == 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;

	if (lp_read_only(i))
		read_only = 1;

	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 == 22 || (remote_version > 17 && am_sender))
		io_start_multiplex_out(fd);

	if (read_only) {
		extern int am_sender;
		if (!am_sender) {
			rprintf(FERROR,"ERROR: module is read only\n");
			return -1;
		}
	}

	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());
	

	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
ff41a59f	104	if (remote_version == 22 \|\| (remote_version > 17 && !am_sender))
8d9dc9f9 AT	105	io_start_multiplex_in(fd);
8d9dc9f9 AT	106
3591c066 AT	107	return client_run(fd, fd, -1, argc, argv);
	108	}
	109
	110
	111
	112	static int rsync_module(int fd, int i)
	113	{
	114	int argc=0;
	115	char *argv[MAX_ARGS];
	116	char **argp;
e42c9458	117	char line[MAXPATHLEN];
1a016bfd AT	118	uid_t uid = (uid_t)-2;
1a016bfd AT	119	gid_t gid = (gid_t)-2;
8ef4ffd6	120	char *p;
56c473b7 AT	121	char *addr = client_addr(fd);
56c473b7 AT	122	char *host = client_name(fd);
874895d5	123	char *name = lp_name(i);
8638dd48	124	int use_chroot = lp_use_chroot(i);
874895d5	125	int start_glob=0;
41979ff8	126	int ret;
7b372642 AT	127	char *request=NULL;
7b372642 AT	128	extern int am_sender;
8d9dc9f9	129	extern int remote_version;
943882a2	130	extern int am_root;
56c473b7 AT	131
	132	if (!allow_access(addr, host, lp_hosts_allow(i), lp_hosts_deny(i))) {
	133	rprintf(FERROR,"rsync denied on module %s from %s (%s)\n",
874895d5	134	name, client_name(fd), client_addr(fd));
c8e78d87	135	io_printf(fd,"@ERROR: access denied to %s from %s (%s)\n",
874895d5	136	name, client_name(fd), client_addr(fd));
56c473b7 AT	137	return -1;
56c473b7 AT	138	}
3591c066	139
5e71c444	140	if (!claim_connection(lp_lock_file(i), lp_max_connections(i))) {
8d72ef6e AT	141	if (errno) {
8d72ef6e AT	142	rprintf(FERROR,"failed to open lock file %s : %s\n",
5e71c444	143	lp_lock_file(i), strerror(errno));
8d72ef6e	144	io_printf(fd,"@ERROR: failed to open lock file %s : %s\n",
5e71c444	145	lp_lock_file(i), strerror(errno));
8d72ef6e AT	146	} else {
8d72ef6e AT	147	rprintf(FERROR,"max connections (%d) reached\n",
5e71c444 AT	148	lp_max_connections(i));
5e71c444 AT	149	io_printf(fd,"@ERROR: max connections (%d) reached - try again later\n", lp_max_connections(i));
8d72ef6e	150	}
0c515f17 AT	151	return -1;
	152	}
	153
31593dd6	154
97cb8dc2	155	auth_user = auth_server(fd, i, addr, "@RSYNCD: AUTHREQD ");
d0d56395	156
97cb8dc2	157	if (!auth_user) {
d0d56395 AT	158	rprintf(FERROR,"auth failed on module %s from %s (%s)\n",
	159	name, client_name(fd), client_addr(fd));
	160	io_printf(fd,"@ERROR: auth failed on module %s\n",name);
	161	return -1;
	162	}
	163
3591c066 AT	164	module_id = i;
	165
	166	if (lp_read_only(i))
	167	read_only = 1;
	168
716baed7	169	am_root = (getuid() == 0);
8ef4ffd6	170
716baed7 DD	171	if (am_root) {
	172	p = lp_uid(i);
	173	if (!name_to_uid(p, &uid)) {
	174	if (!isdigit(*p)) {
	175	rprintf(FERROR,"Invalid uid %s\n", p);
	176	io_printf(fd,"@ERROR: invalid uid\n");
	177	return -1;
	178	}
	179	uid = atoi(p);
	180	}
	181
	182	p = lp_gid(i);
	183	if (!name_to_gid(p, &gid)) {
	184	if (!isdigit(*p)) {
	185	rprintf(FERROR,"Invalid gid %s\n", p);
	186	io_printf(fd,"@ERROR: invalid gid\n");
	187	return -1;
	188	}
	189	gid = atoi(p);
	190	}
8ef4ffd6 AT	191	}
8ef4ffd6 AT	192
cd64343a DD	193	p = lp_include_from(i);
	194	add_exclude_file(p, 1, 1);
	195
	196	p = lp_include(i);
	197	add_include_line(p);
	198
8f3a2d54	199	p = lp_exclude_from(i);
2b6b4d53	200	add_exclude_file(p, 1, 0);
8f3a2d54	201
5805327b	202	p = lp_exclude(i);
8f3a2d54 AT	203	add_exclude_line(p);
8f3a2d54 AT	204
1a016bfd AT	205	log_open();
1a016bfd AT	206
8638dd48 DD	207	if (use_chroot) {
	208	if (chroot(lp_path(i))) {
	209	rprintf(FERROR,"chroot %s failed\n", lp_path(i));
	210	io_printf(fd,"@ERROR: chroot failed\n");
	211	return -1;
	212	}
3591c066	213
c226b7c2	214	if (!push_dir("/", 0)) {
8638dd48 DD	215	rprintf(FERROR,"chdir %s failed\n", lp_path(i));
	216	io_printf(fd,"@ERROR: chdir failed\n");
	217	return -1;
	218	}
3591c066	219
716baed7 DD	220	} else {
	221	if (!push_dir(lp_path(i), 0)) {
	222	rprintf(FERROR,"chdir %s failed\n", lp_path(i));
	223	io_printf(fd,"@ERROR: chdir failed\n");
	224	return -1;
	225	}
cb13abfe	226	sanitize_paths = 1;
716baed7 DD	227	}
	228
	229	if (am_root) {
	230	if (setgid(gid)) {
8638dd48 DD	231	rprintf(FERROR,"setgid %d failed\n", gid);
	232	io_printf(fd,"@ERROR: setgid failed\n");
	233	return -1;
	234	}
3591c066	235
716baed7	236	if (setuid(uid)) {
8638dd48 DD	237	rprintf(FERROR,"setuid %d failed\n", uid);
	238	io_printf(fd,"@ERROR: setuid failed\n");
	239	return -1;
	240	}
	241
716baed7	242	am_root = (getuid() == 0);
3591c066 AT	243	}
	244
	245	io_printf(fd,"@RSYNCD: OK\n");
	246
	247	argv[argc++] = "rsyncd";
	248
	249	while (1) {
	250	if (!read_line(fd, line, sizeof(line)-1)) {
	251	return -1;
	252	}
	253
	254	if (!*line) break;
	255
874895d5 AT	256	p = line;
874895d5 AT	257
874895d5	258	argv[argc] = strdup(p);
3591c066 AT	259	if (!argv[argc]) {
	260	return -1;
	261	}
	262
874895d5	263	if (start_glob) {
1a016bfd	264	if (start_glob == 1) {
7b372642	265	request = strdup(p);
1a016bfd AT	266	start_glob++;
1a016bfd AT	267	}
cb13abfe	268	glob_expand(name, argv, &argc, MAX_ARGS);
874895d5 AT	269	} else {
	270	argc++;
	271	}
	272
	273	if (strcmp(line,".") == 0) {
	274	start_glob = 1;
	275	}
	276
3591c066 AT	277	if (argc == MAX_ARGS) {
	278	return -1;
	279	}
	280	}
	281
cb13abfe	282	if (sanitize_paths) {
8638dd48 DD	283	/*
	284	* Note that this is applied to all parameters, whether or not
	285	* they are filenames, but no other legal parameters contain
	286	* the forms that need to be sanitized so it doesn't hurt;
	287	* it is not known at this point which parameters are files
	288	* and which aren't.
	289	*/
	290	for (i = 1; i < argc; i++) {
cb13abfe	291	sanitize_path(argv[i], NULL);
8638dd48 DD	292	}
	293	}
	294
b86f0cef	295	ret = parse_arguments(argc, argv, 0);
3591c066	296
7b372642	297	if (request) {
97cb8dc2	298	if (*auth_user) {
d0d56395 AT	299	rprintf(FINFO,"rsync %s %s from %s@%s (%s)\n",
d0d56395 AT	300	am_sender?"on":"to",
97cb8dc2	301	request, auth_user, host, addr);
d0d56395 AT	302	} else {
	303	rprintf(FINFO,"rsync %s %s from %s (%s)\n",
	304	am_sender?"on":"to",
	305	request, host, addr);
	306	}
7b372642 AT	307	free(request);
	308	}
	309
0199b05f	310	#if !TRIDGE
3591c066 AT	311	/* don't allow the logs to be flooded too fast */
3591c066 AT	312	if (verbose > 1) verbose = 1;
0199b05f	313	#endif
3591c066 AT	314
	315	argc -= optind;
	316	argp = argv + optind;
	317	optind = 0;
	318
ff41a59f	319	if (remote_version == 22 \|\| (remote_version > 17 && am_sender))
8d9dc9f9 AT	320	io_start_multiplex_out(fd);
8d9dc9f9 AT	321
554e0a8d AT	322	if (read_only) {
	323	extern int am_sender;
	324	if (!am_sender) {
	325	rprintf(FERROR,"ERROR: module is read only\n");
	326	return -1;
	327	}
	328	}
	329
41979ff8	330	if (!ret) {
cd8185f2	331	option_error();
41979ff8 AT	332	}
41979ff8 AT	333
81791cfc AT	334	if (lp_timeout(i)) {
	335	extern int io_timeout;
	336	io_timeout = lp_timeout(i);
	337	}
	338
3591c066 AT	339	start_server(fd, fd, argc, argp);
	340
	341	return 0;
	342	}
	343
7a6421fa AT	344	/* send a list of available modules to the client. Don't list those
7a6421fa AT	345	with "list = False". */
3591c066 AT	346	static void send_listing(int fd)
	347	{
	348	int n = lp_numservices();
	349	int i;
	350
	351	for (i=0;i<n;i++)
	352	if (lp_list(i))
	353	io_printf(fd, "%-15s\t%s\n", lp_name(i), lp_comment(i));
	354	}
	355
	356	/* this is called when a socket connection is established to a client
	357	and we want to start talking. The setup of the system is done from
	358	here */
	359	static int start_daemon(int fd)
	360	{
7a6421fa	361	char line[200];
3591c066	362	char *motd;
8ef4ffd6	363	int i = -1;
4cdf25e4	364	extern char *config_file;
13c5fc0e	365	extern int remote_version;
4cdf25e4	366
f9e940ef	367	if (!lp_load(config_file, 0)) {
65417579	368	exit_cleanup(RERR_SYNTAX);
4cdf25e4	369	}
3591c066 AT	370
3591c066 AT	371	set_socket_options(fd,"SO_KEEPALIVE");
a6801c39 AT	372	set_socket_options(fd,lp_socket_options());
a6801c39 AT	373
3591c066 AT	374
	375	io_printf(fd,"@RSYNCD: %d\n", PROTOCOL_VERSION);
	376
	377	motd = lp_motd_file();
27d3cdbc	378	if (motd && *motd) {
3591c066 AT	379	FILE *f = fopen(motd,"r");
	380	while (f && !feof(f)) {
	381	int len = fread(line, 1, sizeof(line)-1, f);
	382	if (len > 0) {
	383	line[len] = 0;
	384	io_printf(fd,"%s", line);
	385	}
	386	}
	387	if (f) fclose(f);
	388	io_printf(fd,"\n");
	389	}
	390
91eee594 AT	391	if (!read_line(fd, line, sizeof(line)-1)) {
	392	return -1;
	393	}
	394
	395	if (sscanf(line,"@RSYNCD: %d", &remote_version) != 1) {
c8e78d87	396	io_printf(fd,"@ERROR: protocol startup error\n");
91eee594 AT	397	return -1;
	398	}
	399
8ef4ffd6	400	while (i == -1) {
3591c066 AT	401	line[0] = 0;
	402	if (!read_line(fd, line, sizeof(line)-1)) {
	403	return -1;
	404	}
	405
	406	if (!*line \|\| strcmp(line,"#list")==0) {
	407	send_listing(fd);
	408	return -1;
	409	}
	410
	411	if (*line == '#') {
	412	/* it's some sort of command that I don't understand */
c8e78d87	413	io_printf(fd,"@ERROR: Unknown command '%s'\n", line);
3591c066 AT	414	return -1;
	415	}
	416
	417	i = lp_number(line);
	418	if (i == -1) {
c8e78d87	419	io_printf(fd,"@ERROR: Unknown module '%s'\n", line);
3591c066 AT	420	return -1;
3591c066 AT	421	}
3591c066 AT	422	}
3591c066 AT	423
8ef4ffd6	424	return rsync_module(fd, i);
3591c066 AT	425	}
	426
	427
	428	int daemon_main(void)
	429	{
f9e940ef	430	extern char *config_file;
ad517ce5	431	extern int orig_umask;
8638dd48	432	char *pid_file;
1a016bfd	433
3591c066	434	if (is_a_socket(STDIN_FILENO)) {
41979ff8 AT	435	int i;
	436
	437	/* we are running via inetd - close off stdout and
	438	stderr so that library functions (and getopt) don't
	439	try to use them. Redirect them to /dev/null */
	440	for (i=1;i<3;i++) {
	441	close(i);
	442	open("/dev/null", O_RDWR);
	443	}
3eb38818	444
3591c066 AT	445	return start_daemon(STDIN_FILENO);
	446	}
	447
	448	become_daemon();
	449
f9e940ef	450	if (!lp_load(config_file, 1)) {
65417579	451	exit_cleanup(RERR_SYNTAX);
f9e940ef AT	452	}
	453
	454	log_open();
	455
e42c9458 AT	456	rprintf(FINFO,"rsyncd version %s starting\n",VERSION);
e42c9458 AT	457
8638dd48	458	if (((pid_file = lp_pid_file()) != NULL) && (*pid_file != '\0')) {
ad517ce5 DD	459	char pidbuf[16];
ad517ce5 DD	460	int fd;
8638dd48 DD	461	int pid = (int) getpid();
8638dd48 DD	462	cleanup_set_pid(pid);
ad517ce5 DD	463	if ((fd = do_open(lp_pid_file(), O_WRONLY\|O_CREAT\|O_TRUNC,
ad517ce5 DD	464	0666 & ~orig_umask)) == -1) {
8638dd48	465	cleanup_set_pid(0);
8a5d6bba	466	rprintf(FLOG,"failed to create pid file %s\n", pid_file);
65417579	467	exit_cleanup(RERR_FILEIO);
8638dd48	468	}
ad517ce5 DD	469	slprintf(pidbuf, sizeof(pidbuf), "%d\n", pid);
	470	write(fd, pidbuf, strlen(pidbuf));
	471	close(fd);
8638dd48 DD	472	}
8638dd48 DD	473
8ef4ffd6 AT	474	start_accept_loop(rsync_port, start_daemon);
8ef4ffd6 AT	475	return -1;
3591c066 AT	476	}
3591c066 AT	477