[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;

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;

	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);
	if (fd == -1) {
		exit_cleanup(1);
	}
	
	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");

	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);
	char *user;
	int start_glob=0;
	char *request=NULL;
	extern int am_sender;

	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())) {
		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;
	}

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

	if (!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_exclude_from(i);
	add_exclude_file(p, 1);

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

	log_open();

	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;
	}

	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;
		}
	}

	parse_arguments(argc, argv);

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

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

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

	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(1);
	}

	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) {
		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;

	if (is_a_socket(STDIN_FILENO)) {
		/* we are running via inetd */
		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(1);
	}

	log_open();

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

	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;
	27
	28	int start_socket_client(char host, char path, int argc, char *argv[])
	29	{
	30	int fd, i;
	31	char *sargs[MAX_ARGS];
	32	int sargc=0;
e42c9458	33	char line[MAXPATHLEN];
bcb7e502	34	char p, user=NULL;
13c5fc0e	35	extern int remote_version;
3591c066	36
bcb7e502 AT	37	p = strchr(host, '@');
	38	if (p) {
	39	user = host;
	40	host = p+1;
	41	*p = 0;
	42	}
	43
	44	if (!user) user = getenv("USER");
	45	if (!user) user = getenv("LOGNAME");
	46
3591c066 AT	47	fd = open_socket_out(host, rsync_port);
	48	if (fd == -1) {
	49	exit_cleanup(1);
	50	}
	51
	52	server_options(sargs,&sargc);
	53
	54	sargs[sargc++] = ".";
	55
	56	if (path && *path)
	57	sargs[sargc++] = path;
	58
	59	sargs[sargc] = NULL;
	60
91eee594 AT	61	io_printf(fd,"@RSYNCD: %d\n", PROTOCOL_VERSION);
91eee594 AT	62
3591c066 AT	63	if (!read_line(fd, line, sizeof(line)-1)) {
	64	return -1;
	65	}
	66
13c5fc0e	67	if (sscanf(line,"@RSYNCD: %d", &remote_version) != 1) {
3591c066 AT	68	return -1;
	69	}
	70
2c91d3d3 AT	71	p = strchr(path,'/');
	72	if (p) *p = 0;
	73	io_printf(fd,"%s\n",path);
	74	if (p) *p = '/';
	75
3591c066 AT	76	while (1) {
	77	if (!read_line(fd, line, sizeof(line)-1)) {
	78	return -1;
	79	}
31593dd6	80
31593dd6	81	if (strncmp(line,"@RSYNCD: AUTHREQD ",18) == 0) {
bcb7e502	82	auth_client(fd, user, line+18);
31593dd6 AT	83	continue;
31593dd6 AT	84	}
31593dd6	85
3591c066 AT	86	if (strcmp(line,"@RSYNCD: OK") == 0) break;
	87	rprintf(FINFO,"%s\n", line);
	88	}
	89
	90	for (i=0;i<sargc;i++) {
	91	io_printf(fd,"%s\n", sargs[i]);
	92	}
	93	io_printf(fd,"\n");
	94
3591c066 AT	95	return client_run(fd, fd, -1, argc, argv);
	96	}
	97
	98
	99
	100	static int rsync_module(int fd, int i)
	101	{
	102	int argc=0;
	103	char *argv[MAX_ARGS];
	104	char **argp;
e42c9458	105	char line[MAXPATHLEN];
1a016bfd AT	106	uid_t uid = (uid_t)-2;
1a016bfd AT	107	gid_t gid = (gid_t)-2;
8ef4ffd6	108	char *p;
56c473b7 AT	109	char *addr = client_addr(fd);
56c473b7 AT	110	char *host = client_name(fd);
874895d5	111	char *name = lp_name(i);
d0d56395	112	char *user;
874895d5	113	int start_glob=0;
7b372642 AT	114	char *request=NULL;
7b372642 AT	115	extern int am_sender;
56c473b7 AT	116
	117	if (!allow_access(addr, host, lp_hosts_allow(i), lp_hosts_deny(i))) {
	118	rprintf(FERROR,"rsync denied on module %s from %s (%s)\n",
874895d5	119	name, client_name(fd), client_addr(fd));
c8e78d87	120	io_printf(fd,"@ERROR: access denied to %s from %s (%s)\n",
874895d5	121	name, client_name(fd), client_addr(fd));
56c473b7 AT	122	return -1;
56c473b7 AT	123	}
3591c066	124
0c515f17	125	if (!claim_connection(lp_lock_file(), lp_max_connections())) {
c8e78d87 AT	126	rprintf(FERROR,"max connections (%d) reached\n",
	127	lp_max_connections());
	128	io_printf(fd,"@ERROR: max connections (%d) reached - try again later\n", lp_max_connections());
0c515f17 AT	129	return -1;
	130	}
	131
31593dd6	132
d0d56395 AT	133	user = auth_server(fd, i, addr, "@RSYNCD: AUTHREQD ");
	134
	135	if (!user) {
	136	rprintf(FERROR,"auth failed on module %s from %s (%s)\n",
	137	name, client_name(fd), client_addr(fd));
	138	io_printf(fd,"@ERROR: auth failed on module %s\n",name);
	139	return -1;
	140	}
	141
3591c066 AT	142	module_id = i;
	143
	144	if (lp_read_only(i))
	145	read_only = 1;
	146
8ef4ffd6 AT	147	p = lp_uid(i);
	148	if (!name_to_uid(p, &uid)) {
	149	if (!isdigit(*p)) {
	150	rprintf(FERROR,"Invalid uid %s\n", p);
c8e78d87	151	io_printf(fd,"@ERROR: invalid uid\n");
8ef4ffd6 AT	152	return -1;
	153	}
	154	uid = atoi(p);
	155	}
	156
	157	p = lp_gid(i);
	158	if (!name_to_gid(p, &gid)) {
	159	if (!isdigit(*p)) {
	160	rprintf(FERROR,"Invalid gid %s\n", p);
c8e78d87	161	io_printf(fd,"@ERROR: invalid gid\n");
8ef4ffd6 AT	162	return -1;
	163	}
	164	gid = atoi(p);
	165	}
	166
8f3a2d54 AT	167	p = lp_exclude_from(i);
	168	add_exclude_file(p, 1);
	169
5805327b	170	p = lp_exclude(i);
8f3a2d54 AT	171	add_exclude_line(p);
8f3a2d54 AT	172
1a016bfd AT	173	log_open();
1a016bfd AT	174
3591c066	175	if (chroot(lp_path(i))) {
1a016bfd	176	rprintf(FERROR,"chroot %s failed\n", lp_path(i));
3591c066 AT	177	io_printf(fd,"@ERROR: chroot failed\n");
	178	return -1;
	179	}
	180
	181	if (chdir("/")) {
1a016bfd	182	rprintf(FERROR,"chdir %s failed\n", lp_path(i));
3591c066 AT	183	io_printf(fd,"@ERROR: chdir failed\n");
	184	return -1;
	185	}
	186
1a016bfd AT	187	if (setgid(gid) \|\| getgid() != gid) {
1a016bfd AT	188	rprintf(FERROR,"setgid %d failed\n", gid);
3591c066 AT	189	io_printf(fd,"@ERROR: setgid failed\n");
	190	return -1;
	191	}
	192
1a016bfd AT	193	if (setuid(uid) \|\| getuid() != uid) {
1a016bfd AT	194	rprintf(FERROR,"setuid %d failed\n", uid);
3591c066 AT	195	io_printf(fd,"@ERROR: setuid failed\n");
	196	return -1;
	197	}
	198
	199	io_printf(fd,"@RSYNCD: OK\n");
	200
	201	argv[argc++] = "rsyncd";
	202
	203	while (1) {
	204	if (!read_line(fd, line, sizeof(line)-1)) {
	205	return -1;
	206	}
	207
	208	if (!*line) break;
	209
874895d5 AT	210	p = line;
874895d5 AT	211
874895d5	212	argv[argc] = strdup(p);
3591c066 AT	213	if (!argv[argc]) {
	214	return -1;
	215	}
	216
874895d5	217	if (start_glob) {
1a016bfd	218	if (start_glob == 1) {
7b372642	219	request = strdup(p);
1a016bfd AT	220	start_glob++;
1a016bfd AT	221	}
087bf010	222	glob_expand(name, argv, &argc, MAX_ARGS);
874895d5 AT	223	} else {
	224	argc++;
	225	}
	226
	227	if (strcmp(line,".") == 0) {
	228	start_glob = 1;
	229	}
	230
3591c066 AT	231	if (argc == MAX_ARGS) {
	232	return -1;
	233	}
	234	}
	235
	236	parse_arguments(argc, argv);
	237
7b372642	238	if (request) {
d0d56395 AT	239	if (*user) {
	240	rprintf(FINFO,"rsync %s %s from %s@%s (%s)\n",
	241	am_sender?"on":"to",
	242	request, user, host, addr);
	243	} else {
	244	rprintf(FINFO,"rsync %s %s from %s (%s)\n",
	245	am_sender?"on":"to",
	246	request, host, addr);
	247	}
7b372642 AT	248	free(request);
	249	}
	250
3591c066 AT	251	/* don't allow the logs to be flooded too fast */
	252	if (verbose > 1) verbose = 1;
	253
	254	argc -= optind;
	255	argp = argv + optind;
	256	optind = 0;
	257
	258	start_server(fd, fd, argc, argp);
	259
	260	return 0;
	261	}
	262
7a6421fa AT	263	/* send a list of available modules to the client. Don't list those
7a6421fa AT	264	with "list = False". */
3591c066 AT	265	static void send_listing(int fd)
	266	{
	267	int n = lp_numservices();
	268	int i;
	269
	270	for (i=0;i<n;i++)
	271	if (lp_list(i))
	272	io_printf(fd, "%-15s\t%s\n", lp_name(i), lp_comment(i));
	273	}
	274
	275	/* this is called when a socket connection is established to a client
	276	and we want to start talking. The setup of the system is done from
	277	here */
	278	static int start_daemon(int fd)
	279	{
7a6421fa	280	char line[200];
3591c066	281	char *motd;
8ef4ffd6	282	int i = -1;
4cdf25e4	283	extern char *config_file;
13c5fc0e	284	extern int remote_version;
4cdf25e4	285
f9e940ef	286	if (!lp_load(config_file, 0)) {
4cdf25e4 AT	287	exit_cleanup(1);
4cdf25e4 AT	288	}
3591c066 AT	289
3591c066 AT	290	set_socket_options(fd,"SO_KEEPALIVE");
a6801c39 AT	291	set_socket_options(fd,lp_socket_options());
a6801c39 AT	292
3591c066 AT	293
	294	io_printf(fd,"@RSYNCD: %d\n", PROTOCOL_VERSION);
	295
	296	motd = lp_motd_file();
	297	if (*motd) {
	298	FILE *f = fopen(motd,"r");
	299	while (f && !feof(f)) {
	300	int len = fread(line, 1, sizeof(line)-1, f);
	301	if (len > 0) {
	302	line[len] = 0;
	303	io_printf(fd,"%s", line);
	304	}
	305	}
	306	if (f) fclose(f);
	307	io_printf(fd,"\n");
	308	}
	309
91eee594 AT	310	if (!read_line(fd, line, sizeof(line)-1)) {
	311	return -1;
	312	}
	313
	314	if (sscanf(line,"@RSYNCD: %d", &remote_version) != 1) {
c8e78d87	315	io_printf(fd,"@ERROR: protocol startup error\n");
91eee594 AT	316	return -1;
	317	}
	318
8ef4ffd6	319	while (i == -1) {
3591c066 AT	320	line[0] = 0;
	321	if (!read_line(fd, line, sizeof(line)-1)) {
	322	return -1;
	323	}
	324
	325	if (!*line \|\| strcmp(line,"#list")==0) {
	326	send_listing(fd);
	327	return -1;
	328	}
	329
	330	if (*line == '#') {
	331	/* it's some sort of command that I don't understand */
c8e78d87	332	io_printf(fd,"@ERROR: Unknown command '%s'\n", line);
3591c066 AT	333	return -1;
	334	}
	335
	336	i = lp_number(line);
	337	if (i == -1) {
c8e78d87	338	io_printf(fd,"@ERROR: Unknown module '%s'\n", line);
3591c066 AT	339	return -1;
3591c066 AT	340	}
3591c066 AT	341	}
3591c066 AT	342
8ef4ffd6	343	return rsync_module(fd, i);
3591c066 AT	344	}
	345
	346
	347	int daemon_main(void)
	348	{
f9e940ef	349	extern char *config_file;
1a016bfd	350
3591c066 AT	351	if (is_a_socket(STDIN_FILENO)) {
	352	/* we are running via inetd */
	353	return start_daemon(STDIN_FILENO);
	354	}
	355
	356	become_daemon();
	357
f9e940ef AT	358	if (!lp_load(config_file, 1)) {
	359	fprintf(stderr,"failed to load config file %s\n", config_file);
	360	exit_cleanup(1);
	361	}
	362
	363	log_open();
	364
e42c9458 AT	365	rprintf(FINFO,"rsyncd version %s starting\n",VERSION);
e42c9458 AT	366
8ef4ffd6 AT	367	start_accept_loop(rsync_port, start_daemon);
8ef4ffd6 AT	368	return -1;
3591c066 AT	369	}
3591c066 AT	370