[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 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_client;
	extern int am_sender;

	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");

	am_client = 1;

	fd = open_socket_out(host, rsync_port);
	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 > 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(), lp_max_connections())) {
		if (errno) {
			rprintf(FERROR,"failed to open lock file %s : %s\n",
				lp_lock_file(), strerror(errno));
			io_printf(fd,"@ERROR: failed to open lock file %s : %s\n",
				  lp_lock_file(), strerror(errno));
		} else {
			rprintf(FERROR,"max connections (%d) reached\n",
				lp_max_connections());
			io_printf(fd,"@ERROR: max connections (%d) reached - try again later\n", lp_max_connections());
		}
		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;

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

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

		if (setuid(uid) || getuid() != uid) {
			rprintf(FERROR,"setuid %d failed\n", uid);
			io_printf(fd,"@ERROR: setuid 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;
		}
	}

	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, !use_chroot);
		} else {
			argc++;
		}

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

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

	if (!use_chroot) {
		/*
		 * 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++) {
			char *copy = sanitize_path(argv[i]);
			free((void *)argv[i]);
			argv[i] = copy;
		}
	}

	ret = parse_arguments(argc, argv);

	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 > 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());
	

	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;
	char *pid_file;

	/* this ensures that we don't call getcwd after the chroot,
           which doesn't work on platforms that use popen("pwd","r")
           for getcwd */
	push_dir("/", 0);

	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);
		}

		set_nonblocking(STDIN_FILENO);

		return start_daemon(STDIN_FILENO);
	}

	become_daemon();

	if (!lp_load(config_file, 1)) {
		fprintf(stderr,"failed to load config file %s\n", config_file);
		exit_cleanup(RERR_SYNTAX);
	}

	log_open();

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

	if (((pid_file = lp_pid_file()) != NULL) && (*pid_file != '\0')) {
		FILE *f;
		int pid = (int) getpid();
		cleanup_set_pid(pid);
		if ((f = fopen(lp_pid_file(), "w")) == NULL) {
		    cleanup_set_pid(0);
		    fprintf(stderr,"failed to create pid file %s\n", pid_file);
		    exit_cleanup(RERR_FILEIO);
		}
		fprintf(f, "%d\n", pid);
		fclose(f);
	}

	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;
3591c066 AT	28
	29	int start_socket_client(char host, char path, int argc, char *argv[])
	30	{
	31	int fd, i;
	32	char *sargs[MAX_ARGS];
	33	int sargc=0;
e42c9458	34	char line[MAXPATHLEN];
bcb7e502	35	char p, user=NULL;
13c5fc0e	36	extern int remote_version;
8d9dc9f9 AT	37	extern int am_client;
8d9dc9f9 AT	38	extern int am_sender;
3591c066	39
f98df1d9 AT	40	if (*path == '/') {
	41	rprintf(FERROR,"ERROR: The remote path must start with a module name\n");
	42	return -1;
	43	}
	44
bcb7e502 AT	45	p = strchr(host, '@');
	46	if (p) {
	47	user = host;
	48	host = p+1;
	49	*p = 0;
	50	}
	51
	52	if (!user) user = getenv("USER");
	53	if (!user) user = getenv("LOGNAME");
	54
8d9dc9f9 AT	55	am_client = 1;
8d9dc9f9 AT	56
3591c066 AT	57	fd = open_socket_out(host, rsync_port);
3591c066 AT	58	if (fd == -1) {
65417579	59	exit_cleanup(RERR_SOCKETIO);
3591c066 AT	60	}
	61
	62	server_options(sargs,&sargc);
	63
	64	sargs[sargc++] = ".";
	65
	66	if (path && *path)
	67	sargs[sargc++] = path;
	68
	69	sargs[sargc] = NULL;
	70
91eee594 AT	71	io_printf(fd,"@RSYNCD: %d\n", PROTOCOL_VERSION);
91eee594 AT	72
3591c066 AT	73	if (!read_line(fd, line, sizeof(line)-1)) {
	74	return -1;
	75	}
	76
13c5fc0e	77	if (sscanf(line,"@RSYNCD: %d", &remote_version) != 1) {
3591c066 AT	78	return -1;
	79	}
	80
2c91d3d3 AT	81	p = strchr(path,'/');
	82	if (p) *p = 0;
	83	io_printf(fd,"%s\n",path);
	84	if (p) *p = '/';
	85
3591c066 AT	86	while (1) {
	87	if (!read_line(fd, line, sizeof(line)-1)) {
	88	return -1;
	89	}
31593dd6	90
31593dd6	91	if (strncmp(line,"@RSYNCD: AUTHREQD ",18) == 0) {
bcb7e502	92	auth_client(fd, user, line+18);
31593dd6 AT	93	continue;
31593dd6 AT	94	}
31593dd6	95
3591c066 AT	96	if (strcmp(line,"@RSYNCD: OK") == 0) break;
	97	rprintf(FINFO,"%s\n", line);
	98	}
	99
	100	for (i=0;i<sargc;i++) {
	101	io_printf(fd,"%s\n", sargs[i]);
	102	}
	103	io_printf(fd,"\n");
	104
8d9dc9f9 AT	105	if (remote_version > 17 && !am_sender)
	106	io_start_multiplex_in(fd);
	107
3591c066 AT	108	return client_run(fd, fd, -1, argc, argv);
	109	}
	110
	111
	112
	113	static int rsync_module(int fd, int i)
	114	{
	115	int argc=0;
	116	char *argv[MAX_ARGS];
	117	char **argp;
e42c9458	118	char line[MAXPATHLEN];
1a016bfd AT	119	uid_t uid = (uid_t)-2;
1a016bfd AT	120	gid_t gid = (gid_t)-2;
8ef4ffd6	121	char *p;
56c473b7 AT	122	char *addr = client_addr(fd);
56c473b7 AT	123	char *host = client_name(fd);
874895d5	124	char *name = lp_name(i);
8638dd48	125	int use_chroot = lp_use_chroot(i);
874895d5	126	int start_glob=0;
41979ff8	127	int ret;
7b372642 AT	128	char *request=NULL;
7b372642 AT	129	extern int am_sender;
8d9dc9f9	130	extern int remote_version;
943882a2	131	extern int am_root;
56c473b7 AT	132
	133	if (!allow_access(addr, host, lp_hosts_allow(i), lp_hosts_deny(i))) {
	134	rprintf(FERROR,"rsync denied on module %s from %s (%s)\n",
874895d5	135	name, client_name(fd), client_addr(fd));
c8e78d87	136	io_printf(fd,"@ERROR: access denied to %s from %s (%s)\n",
874895d5	137	name, client_name(fd), client_addr(fd));
56c473b7 AT	138	return -1;
56c473b7 AT	139	}
3591c066	140
0c515f17	141	if (!claim_connection(lp_lock_file(), lp_max_connections())) {
8d72ef6e AT	142	if (errno) {
	143	rprintf(FERROR,"failed to open lock file %s : %s\n",
	144	lp_lock_file(), strerror(errno));
	145	io_printf(fd,"@ERROR: failed to open lock file %s : %s\n",
	146	lp_lock_file(), strerror(errno));
	147	} else {
	148	rprintf(FERROR,"max connections (%d) reached\n",
	149	lp_max_connections());
	150	io_printf(fd,"@ERROR: max connections (%d) reached - try again later\n", lp_max_connections());
	151	}
0c515f17 AT	152	return -1;
	153	}
	154
31593dd6	155
97cb8dc2	156	auth_user = auth_server(fd, i, addr, "@RSYNCD: AUTHREQD ");
d0d56395	157
97cb8dc2	158	if (!auth_user) {
d0d56395 AT	159	rprintf(FERROR,"auth failed on module %s from %s (%s)\n",
	160	name, client_name(fd), client_addr(fd));
	161	io_printf(fd,"@ERROR: auth failed on module %s\n",name);
	162	return -1;
	163	}
	164
3591c066 AT	165	module_id = i;
	166
	167	if (lp_read_only(i))
	168	read_only = 1;
	169
8ef4ffd6 AT	170	p = lp_uid(i);
	171	if (!name_to_uid(p, &uid)) {
	172	if (!isdigit(*p)) {
	173	rprintf(FERROR,"Invalid uid %s\n", p);
c8e78d87	174	io_printf(fd,"@ERROR: invalid uid\n");
8ef4ffd6 AT	175	return -1;
	176	}
	177	uid = atoi(p);
	178	}
	179
	180	p = lp_gid(i);
	181	if (!name_to_gid(p, &gid)) {
	182	if (!isdigit(*p)) {
	183	rprintf(FERROR,"Invalid gid %s\n", p);
c8e78d87	184	io_printf(fd,"@ERROR: invalid gid\n");
8ef4ffd6 AT	185	return -1;
	186	}
	187	gid = atoi(p);
	188	}
	189
cd64343a DD	190	p = lp_include_from(i);
	191	add_exclude_file(p, 1, 1);
	192
	193	p = lp_include(i);
	194	add_include_line(p);
	195
8f3a2d54	196	p = lp_exclude_from(i);
2b6b4d53	197	add_exclude_file(p, 1, 0);
8f3a2d54	198
5805327b	199	p = lp_exclude(i);
8f3a2d54 AT	200	add_exclude_line(p);
8f3a2d54 AT	201
1a016bfd AT	202	log_open();
1a016bfd AT	203
8638dd48 DD	204	if (use_chroot) {
	205	if (chroot(lp_path(i))) {
	206	rprintf(FERROR,"chroot %s failed\n", lp_path(i));
	207	io_printf(fd,"@ERROR: chroot failed\n");
	208	return -1;
	209	}
3591c066	210
8638dd48 DD	211	if (chdir("/")) {
	212	rprintf(FERROR,"chdir %s failed\n", lp_path(i));
	213	io_printf(fd,"@ERROR: chdir failed\n");
	214	return -1;
	215	}
3591c066	216
8638dd48 DD	217	if (setgid(gid) \|\| getgid() != gid) {
	218	rprintf(FERROR,"setgid %d failed\n", gid);
	219	io_printf(fd,"@ERROR: setgid failed\n");
	220	return -1;
	221	}
3591c066	222
8638dd48 DD	223	if (setuid(uid) \|\| getuid() != uid) {
	224	rprintf(FERROR,"setuid %d failed\n", uid);
	225	io_printf(fd,"@ERROR: setuid failed\n");
	226	return -1;
	227	}
	228
	229	} else {
	230	if (!push_dir(lp_path(i), 0)) {
	231	rprintf(FERROR,"chdir %s failed\n", lp_path(i));
	232	io_printf(fd,"@ERROR: chdir failed\n");
	233	return -1;
	234	}
3591c066 AT	235	}
3591c066 AT	236
943882a2 AT	237	am_root = (getuid() == 0);
943882a2 AT	238
3591c066 AT	239	io_printf(fd,"@RSYNCD: OK\n");
	240
	241	argv[argc++] = "rsyncd";
	242
	243	while (1) {
	244	if (!read_line(fd, line, sizeof(line)-1)) {
	245	return -1;
	246	}
	247
	248	if (!*line) break;
	249
874895d5 AT	250	p = line;
874895d5 AT	251
874895d5	252	argv[argc] = strdup(p);
3591c066 AT	253	if (!argv[argc]) {
	254	return -1;
	255	}
	256
874895d5	257	if (start_glob) {
1a016bfd	258	if (start_glob == 1) {
7b372642	259	request = strdup(p);
1a016bfd AT	260	start_glob++;
1a016bfd AT	261	}
b389939f	262	glob_expand(name, argv, &argc, MAX_ARGS, !use_chroot);
874895d5 AT	263	} else {
	264	argc++;
	265	}
	266
	267	if (strcmp(line,".") == 0) {
	268	start_glob = 1;
	269	}
	270
3591c066 AT	271	if (argc == MAX_ARGS) {
	272	return -1;
	273	}
	274	}
	275
8638dd48 DD	276	if (!use_chroot) {
	277	/*
	278	* Note that this is applied to all parameters, whether or not
	279	* they are filenames, but no other legal parameters contain
	280	* the forms that need to be sanitized so it doesn't hurt;
	281	* it is not known at this point which parameters are files
	282	* and which aren't.
	283	*/
	284	for (i = 1; i < argc; i++) {
	285	char *copy = sanitize_path(argv[i]);
	286	free((void *)argv[i]);
	287	argv[i] = copy;
	288	}
	289	}
	290
41979ff8	291	ret = parse_arguments(argc, argv);
3591c066	292
7b372642	293	if (request) {
97cb8dc2	294	if (*auth_user) {
d0d56395 AT	295	rprintf(FINFO,"rsync %s %s from %s@%s (%s)\n",
d0d56395 AT	296	am_sender?"on":"to",
97cb8dc2	297	request, auth_user, host, addr);
d0d56395 AT	298	} else {
	299	rprintf(FINFO,"rsync %s %s from %s (%s)\n",
	300	am_sender?"on":"to",
	301	request, host, addr);
	302	}
7b372642 AT	303	free(request);
	304	}
	305
0199b05f	306	#if !TRIDGE
3591c066 AT	307	/* don't allow the logs to be flooded too fast */
3591c066 AT	308	if (verbose > 1) verbose = 1;
0199b05f	309	#endif
3591c066 AT	310
	311	argc -= optind;
	312	argp = argv + optind;
	313	optind = 0;
	314
8d9dc9f9 AT	315	if (remote_version > 17 && am_sender)
	316	io_start_multiplex_out(fd);
	317
41979ff8	318	if (!ret) {
cd8185f2	319	option_error();
41979ff8 AT	320	}
41979ff8 AT	321
81791cfc AT	322	if (lp_timeout(i)) {
	323	extern int io_timeout;
	324	io_timeout = lp_timeout(i);
	325	}
	326
3591c066 AT	327	start_server(fd, fd, argc, argp);
	328
	329	return 0;
	330	}
	331
7a6421fa AT	332	/* send a list of available modules to the client. Don't list those
7a6421fa AT	333	with "list = False". */
3591c066 AT	334	static void send_listing(int fd)
	335	{
	336	int n = lp_numservices();
	337	int i;
	338
	339	for (i=0;i<n;i++)
	340	if (lp_list(i))
	341	io_printf(fd, "%-15s\t%s\n", lp_name(i), lp_comment(i));
	342	}
	343
	344	/* this is called when a socket connection is established to a client
	345	and we want to start talking. The setup of the system is done from
	346	here */
	347	static int start_daemon(int fd)
	348	{
7a6421fa	349	char line[200];
3591c066	350	char *motd;
8ef4ffd6	351	int i = -1;
4cdf25e4	352	extern char *config_file;
13c5fc0e	353	extern int remote_version;
4cdf25e4	354
f9e940ef	355	if (!lp_load(config_file, 0)) {
65417579	356	exit_cleanup(RERR_SYNTAX);
4cdf25e4	357	}
3591c066 AT	358
3591c066 AT	359	set_socket_options(fd,"SO_KEEPALIVE");
a6801c39 AT	360	set_socket_options(fd,lp_socket_options());
a6801c39 AT	361
3591c066 AT	362
	363	io_printf(fd,"@RSYNCD: %d\n", PROTOCOL_VERSION);
	364
	365	motd = lp_motd_file();
27d3cdbc	366	if (motd && *motd) {
3591c066 AT	367	FILE *f = fopen(motd,"r");
	368	while (f && !feof(f)) {
	369	int len = fread(line, 1, sizeof(line)-1, f);
	370	if (len > 0) {
	371	line[len] = 0;
	372	io_printf(fd,"%s", line);
	373	}
	374	}
	375	if (f) fclose(f);
	376	io_printf(fd,"\n");
	377	}
	378
91eee594 AT	379	if (!read_line(fd, line, sizeof(line)-1)) {
	380	return -1;
	381	}
	382
	383	if (sscanf(line,"@RSYNCD: %d", &remote_version) != 1) {
c8e78d87	384	io_printf(fd,"@ERROR: protocol startup error\n");
91eee594 AT	385	return -1;
	386	}
	387
8ef4ffd6	388	while (i == -1) {
3591c066 AT	389	line[0] = 0;
	390	if (!read_line(fd, line, sizeof(line)-1)) {
	391	return -1;
	392	}
	393
	394	if (!*line \|\| strcmp(line,"#list")==0) {
	395	send_listing(fd);
	396	return -1;
	397	}
	398
	399	if (*line == '#') {
	400	/* it's some sort of command that I don't understand */
c8e78d87	401	io_printf(fd,"@ERROR: Unknown command '%s'\n", line);
3591c066 AT	402	return -1;
	403	}
	404
	405	i = lp_number(line);
	406	if (i == -1) {
c8e78d87	407	io_printf(fd,"@ERROR: Unknown module '%s'\n", line);
3591c066 AT	408	return -1;
3591c066 AT	409	}
3591c066 AT	410	}
3591c066 AT	411
8ef4ffd6	412	return rsync_module(fd, i);
3591c066 AT	413	}
	414
	415
	416	int daemon_main(void)
	417	{
f9e940ef	418	extern char *config_file;
8638dd48	419	char *pid_file;
1a016bfd	420
5243c216 AT	421	/* this ensures that we don't call getcwd after the chroot,
	422	which doesn't work on platforms that use popen("pwd","r")
	423	for getcwd */
	424	push_dir("/", 0);
	425
3591c066	426	if (is_a_socket(STDIN_FILENO)) {
41979ff8 AT	427	int i;
	428
	429	/* we are running via inetd - close off stdout and
	430	stderr so that library functions (and getopt) don't
	431	try to use them. Redirect them to /dev/null */
	432	for (i=1;i<3;i++) {
	433	close(i);
	434	open("/dev/null", O_RDWR);
	435	}
3eb38818 AT	436
	437	set_nonblocking(STDIN_FILENO);
	438
3591c066 AT	439	return start_daemon(STDIN_FILENO);
	440	}
	441
	442	become_daemon();
	443
f9e940ef AT	444	if (!lp_load(config_file, 1)) {
f9e940ef AT	445	fprintf(stderr,"failed to load config file %s\n", config_file);
65417579	446	exit_cleanup(RERR_SYNTAX);
f9e940ef AT	447	}
	448
	449	log_open();
	450
e42c9458 AT	451	rprintf(FINFO,"rsyncd version %s starting\n",VERSION);
e42c9458 AT	452
8638dd48 DD	453	if (((pid_file = lp_pid_file()) != NULL) && (*pid_file != '\0')) {
	454	FILE *f;
	455	int pid = (int) getpid();
	456	cleanup_set_pid(pid);
	457	if ((f = fopen(lp_pid_file(), "w")) == NULL) {
	458	cleanup_set_pid(0);
	459	fprintf(stderr,"failed to create pid file %s\n", pid_file);
65417579	460	exit_cleanup(RERR_FILEIO);
8638dd48 DD	461	}
	462	fprintf(f, "%d\n", pid);
	463	fclose(f);
	464	}
	465
8ef4ffd6 AT	466	start_accept_loop(rsync_port, start_daemon);
8ef4ffd6 AT	467	return -1;
3591c066 AT	468	}
3591c066 AT	469