[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;
	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())) {
		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;
	}

	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;
		}
	}

	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;
943882a2	124	extern int am_root;
56c473b7 AT	125
	126	if (!allow_access(addr, host, lp_hosts_allow(i), lp_hosts_deny(i))) {
	127	rprintf(FERROR,"rsync denied on module %s from %s (%s)\n",
874895d5	128	name, client_name(fd), client_addr(fd));
c8e78d87	129	io_printf(fd,"@ERROR: access denied to %s from %s (%s)\n",
874895d5	130	name, client_name(fd), client_addr(fd));
56c473b7 AT	131	return -1;
56c473b7 AT	132	}
3591c066	133
0c515f17	134	if (!claim_connection(lp_lock_file(), lp_max_connections())) {
c8e78d87 AT	135	rprintf(FERROR,"max connections (%d) reached\n",
	136	lp_max_connections());
	137	io_printf(fd,"@ERROR: max connections (%d) reached - try again later\n", lp_max_connections());
0c515f17 AT	138	return -1;
	139	}
	140
31593dd6	141
d0d56395 AT	142	user = auth_server(fd, i, addr, "@RSYNCD: AUTHREQD ");
	143
	144	if (!user) {
	145	rprintf(FERROR,"auth failed on module %s from %s (%s)\n",
	146	name, client_name(fd), client_addr(fd));
	147	io_printf(fd,"@ERROR: auth failed on module %s\n",name);
	148	return -1;
	149	}
	150
3591c066 AT	151	module_id = i;
	152
	153	if (lp_read_only(i))
	154	read_only = 1;
	155
8ef4ffd6 AT	156	p = lp_uid(i);
	157	if (!name_to_uid(p, &uid)) {
	158	if (!isdigit(*p)) {
	159	rprintf(FERROR,"Invalid uid %s\n", p);
c8e78d87	160	io_printf(fd,"@ERROR: invalid uid\n");
8ef4ffd6 AT	161	return -1;
	162	}
	163	uid = atoi(p);
	164	}
	165
	166	p = lp_gid(i);
	167	if (!name_to_gid(p, &gid)) {
	168	if (!isdigit(*p)) {
	169	rprintf(FERROR,"Invalid gid %s\n", p);
c8e78d87	170	io_printf(fd,"@ERROR: invalid gid\n");
8ef4ffd6 AT	171	return -1;
	172	}
	173	gid = atoi(p);
	174	}
	175
8f3a2d54 AT	176	p = lp_exclude_from(i);
	177	add_exclude_file(p, 1);
	178
5805327b	179	p = lp_exclude(i);
8f3a2d54 AT	180	add_exclude_line(p);
8f3a2d54 AT	181
1a016bfd AT	182	log_open();
1a016bfd AT	183
3591c066	184	if (chroot(lp_path(i))) {
1a016bfd	185	rprintf(FERROR,"chroot %s failed\n", lp_path(i));
3591c066 AT	186	io_printf(fd,"@ERROR: chroot failed\n");
	187	return -1;
	188	}
	189
	190	if (chdir("/")) {
1a016bfd	191	rprintf(FERROR,"chdir %s failed\n", lp_path(i));
3591c066 AT	192	io_printf(fd,"@ERROR: chdir failed\n");
	193	return -1;
	194	}
	195
1a016bfd AT	196	if (setgid(gid) \|\| getgid() != gid) {
1a016bfd AT	197	rprintf(FERROR,"setgid %d failed\n", gid);
3591c066 AT	198	io_printf(fd,"@ERROR: setgid failed\n");
	199	return -1;
	200	}
	201
1a016bfd AT	202	if (setuid(uid) \|\| getuid() != uid) {
1a016bfd AT	203	rprintf(FERROR,"setuid %d failed\n", uid);
3591c066 AT	204	io_printf(fd,"@ERROR: setuid failed\n");
	205	return -1;
	206	}
	207
943882a2 AT	208	am_root = (getuid() == 0);
943882a2 AT	209
3591c066 AT	210	io_printf(fd,"@RSYNCD: OK\n");
	211
	212	argv[argc++] = "rsyncd";
	213
	214	while (1) {
	215	if (!read_line(fd, line, sizeof(line)-1)) {
	216	return -1;
	217	}
	218
	219	if (!*line) break;
	220
874895d5 AT	221	p = line;
874895d5 AT	222
874895d5	223	argv[argc] = strdup(p);
3591c066 AT	224	if (!argv[argc]) {
	225	return -1;
	226	}
	227
874895d5	228	if (start_glob) {
1a016bfd	229	if (start_glob == 1) {
7b372642	230	request = strdup(p);
1a016bfd AT	231	start_glob++;
1a016bfd AT	232	}
087bf010	233	glob_expand(name, argv, &argc, MAX_ARGS);
874895d5 AT	234	} else {
	235	argc++;
	236	}
	237
	238	if (strcmp(line,".") == 0) {
	239	start_glob = 1;
	240	}
	241
3591c066 AT	242	if (argc == MAX_ARGS) {
	243	return -1;
	244	}
	245	}
	246
	247	parse_arguments(argc, argv);
	248
7b372642	249	if (request) {
d0d56395 AT	250	if (*user) {
	251	rprintf(FINFO,"rsync %s %s from %s@%s (%s)\n",
	252	am_sender?"on":"to",
	253	request, user, host, addr);
	254	} else {
	255	rprintf(FINFO,"rsync %s %s from %s (%s)\n",
	256	am_sender?"on":"to",
	257	request, host, addr);
	258	}
7b372642 AT	259	free(request);
	260	}
	261
3591c066 AT	262	/* don't allow the logs to be flooded too fast */
	263	if (verbose > 1) verbose = 1;
	264
	265	argc -= optind;
	266	argp = argv + optind;
	267	optind = 0;
	268
8d9dc9f9 AT	269	if (remote_version > 17 && am_sender)
	270	io_start_multiplex_out(fd);
	271
3591c066 AT	272	start_server(fd, fd, argc, argp);
	273
	274	return 0;
	275	}
	276
7a6421fa AT	277	/* send a list of available modules to the client. Don't list those
7a6421fa AT	278	with "list = False". */
3591c066 AT	279	static void send_listing(int fd)
	280	{
	281	int n = lp_numservices();
	282	int i;
	283
	284	for (i=0;i<n;i++)
	285	if (lp_list(i))
	286	io_printf(fd, "%-15s\t%s\n", lp_name(i), lp_comment(i));
	287	}
	288
	289	/* this is called when a socket connection is established to a client
	290	and we want to start talking. The setup of the system is done from
	291	here */
	292	static int start_daemon(int fd)
	293	{
7a6421fa	294	char line[200];
3591c066	295	char *motd;
8ef4ffd6	296	int i = -1;
4cdf25e4	297	extern char *config_file;
13c5fc0e	298	extern int remote_version;
4cdf25e4	299
f9e940ef	300	if (!lp_load(config_file, 0)) {
4cdf25e4 AT	301	exit_cleanup(1);
4cdf25e4 AT	302	}
3591c066 AT	303
3591c066 AT	304	set_socket_options(fd,"SO_KEEPALIVE");
a6801c39 AT	305	set_socket_options(fd,lp_socket_options());
a6801c39 AT	306
3591c066 AT	307
	308	io_printf(fd,"@RSYNCD: %d\n", PROTOCOL_VERSION);
	309
	310	motd = lp_motd_file();
	311	if (*motd) {
	312	FILE *f = fopen(motd,"r");
	313	while (f && !feof(f)) {
	314	int len = fread(line, 1, sizeof(line)-1, f);
	315	if (len > 0) {
	316	line[len] = 0;
	317	io_printf(fd,"%s", line);
	318	}
	319	}
	320	if (f) fclose(f);
	321	io_printf(fd,"\n");
	322	}
	323
91eee594 AT	324	if (!read_line(fd, line, sizeof(line)-1)) {
	325	return -1;
	326	}
	327
	328	if (sscanf(line,"@RSYNCD: %d", &remote_version) != 1) {
c8e78d87	329	io_printf(fd,"@ERROR: protocol startup error\n");
91eee594 AT	330	return -1;
	331	}
	332
8ef4ffd6	333	while (i == -1) {
3591c066 AT	334	line[0] = 0;
	335	if (!read_line(fd, line, sizeof(line)-1)) {
	336	return -1;
	337	}
	338
	339	if (!*line \|\| strcmp(line,"#list")==0) {
	340	send_listing(fd);
	341	return -1;
	342	}
	343
	344	if (*line == '#') {
	345	/* it's some sort of command that I don't understand */
c8e78d87	346	io_printf(fd,"@ERROR: Unknown command '%s'\n", line);
3591c066 AT	347	return -1;
	348	}
	349
	350	i = lp_number(line);
	351	if (i == -1) {
c8e78d87	352	io_printf(fd,"@ERROR: Unknown module '%s'\n", line);
3591c066 AT	353	return -1;
3591c066 AT	354	}
3591c066 AT	355	}
3591c066 AT	356
8ef4ffd6	357	return rsync_module(fd, i);
3591c066 AT	358	}
	359
	360
	361	int daemon_main(void)
	362	{
f9e940ef	363	extern char *config_file;
1a016bfd	364
3591c066 AT	365	if (is_a_socket(STDIN_FILENO)) {
	366	/* we are running via inetd */
	367	return start_daemon(STDIN_FILENO);
	368	}
	369
	370	become_daemon();
	371
f9e940ef AT	372	if (!lp_load(config_file, 1)) {
	373	fprintf(stderr,"failed to load config file %s\n", config_file);
	374	exit_cleanup(1);
	375	}
	376
	377	log_open();
	378
e42c9458 AT	379	rprintf(FINFO,"rsyncd version %s starting\n",VERSION);
e42c9458 AT	380
8ef4ffd6 AT	381	start_accept_loop(rsync_port, start_daemon);
8ef4ffd6 AT	382	return -1;
3591c066 AT	383	}
3591c066 AT	384