[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;
	extern int am_client;
	extern int am_sender;

	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(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");

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

	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;

	if (remote_version > 17 && am_sender)
		io_start_multiplex_out(fd);

	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;
8d9dc9f9 AT	36	extern int am_client;
8d9dc9f9 AT	37	extern int am_sender;
3591c066	38
bcb7e502 AT	39	p = strchr(host, '@');
	40	if (p) {
	41	user = host;
	42	host = p+1;
	43	*p = 0;
	44	}
	45
	46	if (!user) user = getenv("USER");
	47	if (!user) user = getenv("LOGNAME");
	48
8d9dc9f9 AT	49	am_client = 1;
8d9dc9f9 AT	50
3591c066 AT	51	fd = open_socket_out(host, rsync_port);
	52	if (fd == -1) {
	53	exit_cleanup(1);
	54	}
	55
	56	server_options(sargs,&sargc);
	57
	58	sargs[sargc++] = ".";
	59
	60	if (path && *path)
	61	sargs[sargc++] = path;
	62
	63	sargs[sargc] = NULL;
	64
91eee594 AT	65	io_printf(fd,"@RSYNCD: %d\n", PROTOCOL_VERSION);
91eee594 AT	66
3591c066 AT	67	if (!read_line(fd, line, sizeof(line)-1)) {
	68	return -1;
	69	}
	70
13c5fc0e	71	if (sscanf(line,"@RSYNCD: %d", &remote_version) != 1) {
3591c066 AT	72	return -1;
	73	}
	74
2c91d3d3 AT	75	p = strchr(path,'/');
	76	if (p) *p = 0;
	77	io_printf(fd,"%s\n",path);
	78	if (p) *p = '/';
	79
3591c066 AT	80	while (1) {
	81	if (!read_line(fd, line, sizeof(line)-1)) {
	82	return -1;
	83	}
31593dd6	84
31593dd6	85	if (strncmp(line,"@RSYNCD: AUTHREQD ",18) == 0) {
bcb7e502	86	auth_client(fd, user, line+18);
31593dd6 AT	87	continue;
31593dd6 AT	88	}
31593dd6	89
3591c066 AT	90	if (strcmp(line,"@RSYNCD: OK") == 0) break;
	91	rprintf(FINFO,"%s\n", line);
	92	}
	93
	94	for (i=0;i<sargc;i++) {
	95	io_printf(fd,"%s\n", sargs[i]);
	96	}
	97	io_printf(fd,"\n");
	98
8d9dc9f9 AT	99	if (remote_version > 17 && !am_sender)
	100	io_start_multiplex_in(fd);
	101
3591c066 AT	102	return client_run(fd, fd, -1, argc, argv);
	103	}
	104
	105
	106
	107	static int rsync_module(int fd, int i)
	108	{
	109	int argc=0;
	110	char *argv[MAX_ARGS];
	111	char **argp;
e42c9458	112	char line[MAXPATHLEN];
1a016bfd AT	113	uid_t uid = (uid_t)-2;
1a016bfd AT	114	gid_t gid = (gid_t)-2;
8ef4ffd6	115	char *p;
56c473b7 AT	116	char *addr = client_addr(fd);
56c473b7 AT	117	char *host = client_name(fd);
874895d5	118	char *name = lp_name(i);
d0d56395	119	char *user;
874895d5	120	int start_glob=0;
7b372642 AT	121	char *request=NULL;
7b372642 AT	122	extern int am_sender;
8d9dc9f9	123	extern int remote_version;
56c473b7 AT	124
	125	if (!allow_access(addr, host, lp_hosts_allow(i), lp_hosts_deny(i))) {
	126	rprintf(FERROR,"rsync denied on module %s from %s (%s)\n",
874895d5	127	name, client_name(fd), client_addr(fd));
c8e78d87	128	io_printf(fd,"@ERROR: access denied to %s from %s (%s)\n",
874895d5	129	name, client_name(fd), client_addr(fd));
56c473b7 AT	130	return -1;
56c473b7 AT	131	}
3591c066	132
0c515f17	133	if (!claim_connection(lp_lock_file(), lp_max_connections())) {
c8e78d87 AT	134	rprintf(FERROR,"max connections (%d) reached\n",
	135	lp_max_connections());
	136	io_printf(fd,"@ERROR: max connections (%d) reached - try again later\n", lp_max_connections());
0c515f17 AT	137	return -1;
	138	}
	139
31593dd6	140
d0d56395 AT	141	user = auth_server(fd, i, addr, "@RSYNCD: AUTHREQD ");
	142
	143	if (!user) {
	144	rprintf(FERROR,"auth failed on module %s from %s (%s)\n",
	145	name, client_name(fd), client_addr(fd));
	146	io_printf(fd,"@ERROR: auth failed on module %s\n",name);
	147	return -1;
	148	}
	149
3591c066 AT	150	module_id = i;
	151
	152	if (lp_read_only(i))
	153	read_only = 1;
	154
8ef4ffd6 AT	155	p = lp_uid(i);
	156	if (!name_to_uid(p, &uid)) {
	157	if (!isdigit(*p)) {
	158	rprintf(FERROR,"Invalid uid %s\n", p);
c8e78d87	159	io_printf(fd,"@ERROR: invalid uid\n");
8ef4ffd6 AT	160	return -1;
	161	}
	162	uid = atoi(p);
	163	}
	164
	165	p = lp_gid(i);
	166	if (!name_to_gid(p, &gid)) {
	167	if (!isdigit(*p)) {
	168	rprintf(FERROR,"Invalid gid %s\n", p);
c8e78d87	169	io_printf(fd,"@ERROR: invalid gid\n");
8ef4ffd6 AT	170	return -1;
	171	}
	172	gid = atoi(p);
	173	}
	174
8f3a2d54 AT	175	p = lp_exclude_from(i);
	176	add_exclude_file(p, 1);
	177
5805327b	178	p = lp_exclude(i);
8f3a2d54 AT	179	add_exclude_line(p);
8f3a2d54 AT	180
1a016bfd AT	181	log_open();
1a016bfd AT	182
3591c066	183	if (chroot(lp_path(i))) {
1a016bfd	184	rprintf(FERROR,"chroot %s failed\n", lp_path(i));
3591c066 AT	185	io_printf(fd,"@ERROR: chroot failed\n");
	186	return -1;
	187	}
	188
	189	if (chdir("/")) {
1a016bfd	190	rprintf(FERROR,"chdir %s failed\n", lp_path(i));
3591c066 AT	191	io_printf(fd,"@ERROR: chdir failed\n");
	192	return -1;
	193	}
	194
1a016bfd AT	195	if (setgid(gid) \|\| getgid() != gid) {
1a016bfd AT	196	rprintf(FERROR,"setgid %d failed\n", gid);
3591c066 AT	197	io_printf(fd,"@ERROR: setgid failed\n");
	198	return -1;
	199	}
	200
1a016bfd AT	201	if (setuid(uid) \|\| getuid() != uid) {
1a016bfd AT	202	rprintf(FERROR,"setuid %d failed\n", uid);
3591c066 AT	203	io_printf(fd,"@ERROR: setuid failed\n");
	204	return -1;
	205	}
	206
	207	io_printf(fd,"@RSYNCD: OK\n");
	208
	209	argv[argc++] = "rsyncd";
	210
	211	while (1) {
	212	if (!read_line(fd, line, sizeof(line)-1)) {
	213	return -1;
	214	}
	215
	216	if (!*line) break;
	217
874895d5 AT	218	p = line;
874895d5 AT	219
874895d5	220	argv[argc] = strdup(p);
3591c066 AT	221	if (!argv[argc]) {
	222	return -1;
	223	}
	224
874895d5	225	if (start_glob) {
1a016bfd	226	if (start_glob == 1) {
7b372642	227	request = strdup(p);
1a016bfd AT	228	start_glob++;
1a016bfd AT	229	}
087bf010	230	glob_expand(name, argv, &argc, MAX_ARGS);
874895d5 AT	231	} else {
	232	argc++;
	233	}
	234
	235	if (strcmp(line,".") == 0) {
	236	start_glob = 1;
	237	}
	238
3591c066 AT	239	if (argc == MAX_ARGS) {
	240	return -1;
	241	}
	242	}
	243
	244	parse_arguments(argc, argv);
	245
7b372642	246	if (request) {
d0d56395 AT	247	if (*user) {
	248	rprintf(FINFO,"rsync %s %s from %s@%s (%s)\n",
	249	am_sender?"on":"to",
	250	request, user, host, addr);
	251	} else {
	252	rprintf(FINFO,"rsync %s %s from %s (%s)\n",
	253	am_sender?"on":"to",
	254	request, host, addr);
	255	}
7b372642 AT	256	free(request);
	257	}
	258
3591c066 AT	259	/* don't allow the logs to be flooded too fast */
	260	if (verbose > 1) verbose = 1;
	261
	262	argc -= optind;
	263	argp = argv + optind;
	264	optind = 0;
	265
8d9dc9f9 AT	266	if (remote_version > 17 && am_sender)
	267	io_start_multiplex_out(fd);
	268
3591c066 AT	269	start_server(fd, fd, argc, argp);
	270
	271	return 0;
	272	}
	273
7a6421fa AT	274	/* send a list of available modules to the client. Don't list those
7a6421fa AT	275	with "list = False". */
3591c066 AT	276	static void send_listing(int fd)
	277	{
	278	int n = lp_numservices();
	279	int i;
	280
	281	for (i=0;i<n;i++)
	282	if (lp_list(i))
	283	io_printf(fd, "%-15s\t%s\n", lp_name(i), lp_comment(i));
	284	}
	285
	286	/* this is called when a socket connection is established to a client
	287	and we want to start talking. The setup of the system is done from
	288	here */
	289	static int start_daemon(int fd)
	290	{
7a6421fa	291	char line[200];
3591c066	292	char *motd;
8ef4ffd6	293	int i = -1;
4cdf25e4	294	extern char *config_file;
13c5fc0e	295	extern int remote_version;
4cdf25e4	296
f9e940ef	297	if (!lp_load(config_file, 0)) {
4cdf25e4 AT	298	exit_cleanup(1);
4cdf25e4 AT	299	}
3591c066 AT	300
3591c066 AT	301	set_socket_options(fd,"SO_KEEPALIVE");
a6801c39 AT	302	set_socket_options(fd,lp_socket_options());
a6801c39 AT	303
3591c066 AT	304
	305	io_printf(fd,"@RSYNCD: %d\n", PROTOCOL_VERSION);
	306
	307	motd = lp_motd_file();
	308	if (*motd) {
	309	FILE *f = fopen(motd,"r");
	310	while (f && !feof(f)) {
	311	int len = fread(line, 1, sizeof(line)-1, f);
	312	if (len > 0) {
	313	line[len] = 0;
	314	io_printf(fd,"%s", line);
	315	}
	316	}
	317	if (f) fclose(f);
	318	io_printf(fd,"\n");
	319	}
	320
91eee594 AT	321	if (!read_line(fd, line, sizeof(line)-1)) {
	322	return -1;
	323	}
	324
	325	if (sscanf(line,"@RSYNCD: %d", &remote_version) != 1) {
c8e78d87	326	io_printf(fd,"@ERROR: protocol startup error\n");
91eee594 AT	327	return -1;
	328	}
	329
8ef4ffd6	330	while (i == -1) {
3591c066 AT	331	line[0] = 0;
	332	if (!read_line(fd, line, sizeof(line)-1)) {
	333	return -1;
	334	}
	335
	336	if (!*line \|\| strcmp(line,"#list")==0) {
	337	send_listing(fd);
	338	return -1;
	339	}
	340
	341	if (*line == '#') {
	342	/* it's some sort of command that I don't understand */
c8e78d87	343	io_printf(fd,"@ERROR: Unknown command '%s'\n", line);
3591c066 AT	344	return -1;
	345	}
	346
	347	i = lp_number(line);
	348	if (i == -1) {
c8e78d87	349	io_printf(fd,"@ERROR: Unknown module '%s'\n", line);
3591c066 AT	350	return -1;
3591c066 AT	351	}
3591c066 AT	352	}
3591c066 AT	353
8ef4ffd6	354	return rsync_module(fd, i);
3591c066 AT	355	}
	356
	357
	358	int daemon_main(void)
	359	{
f9e940ef	360	extern char *config_file;
1a016bfd	361
3591c066 AT	362	if (is_a_socket(STDIN_FILENO)) {
	363	/* we are running via inetd */
	364	return start_daemon(STDIN_FILENO);
	365	}
	366
	367	become_daemon();
	368
f9e940ef AT	369	if (!lp_load(config_file, 1)) {
	370	fprintf(stderr,"failed to load config file %s\n", config_file);
	371	exit_cleanup(1);
	372	}
	373
	374	log_open();
	375
e42c9458 AT	376	rprintf(FINFO,"rsyncd version %s starting\n",VERSION);
e42c9458 AT	377
8ef4ffd6 AT	378	start_accept_loop(rsync_port, start_daemon);
8ef4ffd6 AT	379	return -1;
3591c066 AT	380	}
3591c066 AT	381