[rsync/rsync.git] / compat.c

/*
 * Compatibility routines for older rsync protocol versions.
 *
 * Copyright (C) Andrew Tridgell 1996
 * Copyright (C) Paul Mackerras 1996
 * Copyright (C) 2004-2007 Wayne Davison
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * 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.,
 * 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.
 */

#include "rsync.h"

int remote_protocol = 0;
int file_extra_cnt = 0; /* count of file-list extras that everyone gets */
int inc_recurse = 0;

extern int verbose;
extern int am_server;
extern int am_sender;
extern int local_server;
extern int inplace;
extern int recurse;
extern int allow_inc_recurse;
extern int fuzzy_basis;
extern int read_batch;
extern int max_delete;
extern int delay_updates;
extern int checksum_seed;
extern int basis_dir_cnt;
extern int prune_empty_dirs;
extern int protocol_version;
extern int preserve_uid;
extern int preserve_gid;
extern int preserve_acls;
extern int preserve_xattrs;
extern int preserve_hard_links;
extern int need_messages_from_generator;
extern int delete_mode, delete_before, delete_during, delete_after;
extern int delete_excluded;
extern int make_backups;
extern char *shell_cmd; /* contains VER.SUB string if client is a pre-release */
extern char *backup_dir, *backup_suffix;
extern char *partial_dir;
extern char *dest_option;
extern struct filter_list_struct filter_list;

/* The server makes sure that if either side only supports a pre-release
 * version of a protocol, that both sides must speak a compatible version
 * of that protocol for it to be advertised as available. */
static void check_sub_protocol(void)
{
	char *dot;
	int their_protocol, their_sub;
	int our_sub = protocol_version < PROTOCOL_VERSION ? 0 : SUBPROTOCOL_VERSION;

	if (!shell_cmd || !(dot = strchr(shell_cmd, '.'))
	 || !(their_protocol = atoi(shell_cmd))
	 || !(their_sub = atoi(dot+1))) {
		if (our_sub)
			protocol_version--;
		return;
	}

	if (their_protocol < protocol_version) {
		if (their_sub)
			protocol_version = their_protocol - 1;
		return;
	}

	if (their_protocol > protocol_version)
		their_sub = 0; /* 0 == final version */
	if (their_sub != our_sub)
		protocol_version--;
}

void setup_protocol(int f_out,int f_in)
{
	if (am_sender)
		file_extra_cnt += PTR_EXTRA_LEN;
	else
		file_extra_cnt++;
	if (preserve_uid)
		preserve_uid = ++file_extra_cnt;
	if (preserve_gid)
		preserve_gid = ++file_extra_cnt;
	if (preserve_acls && !am_sender)
		preserve_acls = ++file_extra_cnt;
	if (preserve_xattrs)
		preserve_xattrs = ++file_extra_cnt;

	if (remote_protocol == 0) {
		if (am_server && !local_server)
			check_sub_protocol();
		if (!read_batch)
			write_int(f_out, protocol_version);
		remote_protocol = read_int(f_in);
		if (protocol_version > remote_protocol)
			protocol_version = remote_protocol;
	}
	if (read_batch && remote_protocol > protocol_version) {
		rprintf(FERROR, "The protocol version in the batch file is too new (%d > %d).\n",
			remote_protocol, protocol_version);
		exit_cleanup(RERR_PROTOCOL);
	}

	if (verbose > 3) {
		rprintf(FINFO, "(%s) Protocol versions: remote=%d, negotiated=%d\n",
			am_server? "Server" : "Client", remote_protocol, protocol_version);
	}
	if (remote_protocol < MIN_PROTOCOL_VERSION
	 || remote_protocol > MAX_PROTOCOL_VERSION) {
		rprintf(FERROR,"protocol version mismatch -- is your shell clean?\n");
		rprintf(FERROR,"(see the rsync man page for an explanation)\n");
		exit_cleanup(RERR_PROTOCOL);
	}
	if (remote_protocol < OLD_PROTOCOL_VERSION) {
		rprintf(FINFO,"%s is very old version of rsync, upgrade recommended.\n",
			am_server? "Client" : "Server");
	}
	if (protocol_version < MIN_PROTOCOL_VERSION) {
		rprintf(FERROR, "--protocol must be at least %d on the %s.\n",
			MIN_PROTOCOL_VERSION, am_server? "Server" : "Client");
		exit_cleanup(RERR_PROTOCOL);
	}
	if (protocol_version > PROTOCOL_VERSION) {
		rprintf(FERROR, "--protocol must be no more than %d on the %s.\n",
			PROTOCOL_VERSION, am_server? "Server" : "Client");
		exit_cleanup(RERR_PROTOCOL);
	}

	if (protocol_version < 30) {
		if (max_delete == 0 && am_sender) {
			rprintf(FERROR,
			    "--max-delete=0 requires protocol 30 or higher"
			    " (negotiated %d).\n",
			    protocol_version);
			exit_cleanup(RERR_PROTOCOL);
		}
		if (preserve_acls && !local_server) {
			rprintf(FERROR,
			    "--acls requires protocol 30 or higher"
			    " (negotiated %d).\n",
			    protocol_version);
			exit_cleanup(RERR_PROTOCOL);
		}
		if (preserve_xattrs && !local_server) {
			rprintf(FERROR,
			    "--xattrs requires protocol 30 or higher"
			    " (negotiated %d).\n",
			    protocol_version);
			exit_cleanup(RERR_PROTOCOL);
		}
	}

	if (delete_mode && !(delete_before+delete_during+delete_after)) {
		if (protocol_version < 30)
			delete_before = 1;
		else
			delete_during = 1;
	}

	if (protocol_version < 29) {
		if (fuzzy_basis) {
			rprintf(FERROR,
			    "--fuzzy requires protocol 29 or higher"
			    " (negotiated %d).\n",
			    protocol_version);
			exit_cleanup(RERR_PROTOCOL);
		}

		if (basis_dir_cnt && inplace) {
			rprintf(FERROR,
			    "%s with --inplace requires protocol 29 or higher"
			    " (negotiated %d).\n",
			    dest_option, protocol_version);
			exit_cleanup(RERR_PROTOCOL);
		}

		if (basis_dir_cnt > 1) {
			rprintf(FERROR,
			    "Using more than one %s option requires protocol"
			    " 29 or higher (negotiated %d).\n",
			    dest_option, protocol_version);
			exit_cleanup(RERR_PROTOCOL);
		}

		if (prune_empty_dirs) {
			rprintf(FERROR,
			    "--prune-empty-dirs requires protocol 29 or higher"
			    " (negotiated %d).\n",
			    protocol_version);
			exit_cleanup(RERR_PROTOCOL);
		}
	} else if (protocol_version >= 30) {
		if (recurse && allow_inc_recurse && !preserve_hard_links
		 && !delete_before && !delete_after && !delay_updates
		 && !prune_empty_dirs)
			inc_recurse = 1;
		need_messages_from_generator = 1;
	}

	if (partial_dir && *partial_dir != '/' && (!am_server || local_server)) {
		int flags = MATCHFLG_NO_PREFIXES | MATCHFLG_DIRECTORY;
		if (!am_sender || protocol_version >= 30)
			flags |= MATCHFLG_PERISHABLE;
		parse_rule(&filter_list, partial_dir, flags, 0);
	}

	if (am_server) {
		if (!checksum_seed)
			checksum_seed = time(NULL);
		write_int(f_out, checksum_seed);
	} else {
		checksum_seed = read_int(f_in);
	}
}
Commit	Line	Data
0f78b815	1	/*
d1f83bcc	2	* Compatibility routines for older rsync protocol versions.
0f78b815 WD	3	*
	4	* Copyright (C) Andrew Tridgell 1996
	5	* Copyright (C) Paul Mackerras 1996
ba2133d6	6	* Copyright (C) 2004-2007 Wayne Davison
0f78b815 WD	7	*
0f78b815 WD	8	* This program is free software; you can redistribute it and/or modify
ba2133d6 WD	9	* it under the terms of the GNU General Public License version 2 as
ba2133d6 WD	10	* published by the Free Software Foundation.
0f78b815 WD	11	*
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
	16	*
e7c67065 WD	17	* You should have received a copy of the GNU General Public License along
	18	* with this program; if not, write to the Free Software Foundation, Inc.,
	19	* 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.
0f78b815	20	*/
4fe159a8 AT	21
	22	#include "rsync.h"
	23
8a9709de	24	int remote_protocol = 0;
99a957d3	25	int file_extra_cnt = 0; /* count of file-list extras that everyone gets */
3ea6e0e7	26	int inc_recurse = 0;
8a9709de	27
b9f592fb	28	extern int verbose;
aae43eb3	29	extern int am_server;
771d0add	30	extern int am_sender;
d0c59b0e	31	extern int local_server;
57b12568	32	extern int inplace;
e4b619b4	33	extern int recurse;
5275029d	34	extern int allow_inc_recurse;
e461b9be	35	extern int fuzzy_basis;
b9f592fb	36	extern int read_batch;
771d0add	37	extern int max_delete;
e4b619b4	38	extern int delay_updates;
aae43eb3	39	extern int checksum_seed;
57b12568	40	extern int basis_dir_cnt;
a1cc199b	41	extern int prune_empty_dirs;
8a9709de	42	extern int protocol_version;
99a957d3 WD	43	extern int preserve_uid;
99a957d3 WD	44	extern int preserve_gid;
1c3344a1	45	extern int preserve_acls;
16edf865	46	extern int preserve_xattrs;
e4b619b4 WD	47	extern int preserve_hard_links;
	48	extern int need_messages_from_generator;
	49	extern int delete_mode, delete_before, delete_during, delete_after;
c1289508 WD	50	extern int delete_excluded;
c1289508 WD	51	extern int make_backups;
486f8cd1	52	extern char shell_cmd; / contains VER.SUB string if client is a pre-release */
c1289508 WD	53	extern char backup_dir, backup_suffix;
c1289508 WD	54	extern char *partial_dir;
57b12568	55	extern char *dest_option;
c1289508	56	extern struct filter_list_struct filter_list;
4fe159a8	57
486f8cd1 WD	58	/* The server makes sure that if either side only supports a pre-release
	59	* version of a protocol, that both sides must speak a compatible version
	60	* of that protocol for it to be advertised as available. */
	61	static void check_sub_protocol(void)
	62	{
	63	char *dot;
	64	int their_protocol, their_sub;
	65	int our_sub = protocol_version < PROTOCOL_VERSION ? 0 : SUBPROTOCOL_VERSION;
	66
	67	if (!shell_cmd \|\| !(dot = strchr(shell_cmd, '.'))
	68	\|\| !(their_protocol = atoi(shell_cmd))
	69	\|\| !(their_sub = atoi(dot+1))) {
	70	if (our_sub)
	71	protocol_version--;
	72	return;
	73	}
	74
	75	if (their_protocol < protocol_version) {
	76	if (their_sub)
	77	protocol_version = their_protocol - 1;
	78	return;
	79	}
	80
	81	if (their_protocol > protocol_version)
	82	their_sub = 0; /* 0 == final version */
	83	if (their_sub != our_sub)
	84	protocol_version--;
	85	}
	86
aae43eb3	87	void setup_protocol(int f_out,int f_in)
4fe159a8	88	{
6eee13cf	89	if (am_sender)
99a957d3	90	file_extra_cnt += PTR_EXTRA_LEN;
6eee13cf	91	else
99a957d3	92	file_extra_cnt++;
6eee13cf	93	if (preserve_uid)
99a957d3	94	preserve_uid = ++file_extra_cnt;
6eee13cf	95	if (preserve_gid)
99a957d3	96	preserve_gid = ++file_extra_cnt;
1c3344a1 WD	97	if (preserve_acls && !am_sender)
1c3344a1 WD	98	preserve_acls = ++file_extra_cnt;
16edf865 WD	99	if (preserve_xattrs)
16edf865 WD	100	preserve_xattrs = ++file_extra_cnt;
6eee13cf	101
8a9709de	102	if (remote_protocol == 0) {
486f8cd1 WD	103	if (am_server && !local_server)
486f8cd1 WD	104	check_sub_protocol();
aa434321	105	if (!read_batch)
8a9709de	106	write_int(f_out, protocol_version);
aa434321	107	remote_protocol = read_int(f_in);
8a9709de WD	108	if (protocol_version > remote_protocol)
8a9709de WD	109	protocol_version = remote_protocol;
13c5fc0e	110	}
b9f592fb	111	if (read_batch && remote_protocol > protocol_version) {
486f8cd1	112	rprintf(FERROR, "The protocol version in the batch file is too new (%d > %d).\n",
b9f592fb WD	113	remote_protocol, protocol_version);
	114	exit_cleanup(RERR_PROTOCOL);
	115	}
aae43eb3	116
8a9709de WD	117	if (verbose > 3) {
	118	rprintf(FINFO, "(%s) Protocol versions: remote=%d, negotiated=%d\n",
	119	am_server? "Server" : "Client", remote_protocol, protocol_version);
	120	}
	121	if (remote_protocol < MIN_PROTOCOL_VERSION
	122	\|\| remote_protocol > MAX_PROTOCOL_VERSION) {
4ccfd96c	123	rprintf(FERROR,"protocol version mismatch -- is your shell clean?\n");
d310a212	124	rprintf(FERROR,"(see the rsync man page for an explanation)\n");
65417579	125	exit_cleanup(RERR_PROTOCOL);
8a9709de WD	126	}
8a9709de WD	127	if (remote_protocol < OLD_PROTOCOL_VERSION) {
1b2db7ae	128	rprintf(FINFO,"%s is very old version of rsync, upgrade recommended.\n",
8a9709de WD	129	am_server? "Client" : "Server");
	130	}
	131	if (protocol_version < MIN_PROTOCOL_VERSION) {
	132	rprintf(FERROR, "--protocol must be at least %d on the %s.\n",
	133	MIN_PROTOCOL_VERSION, am_server? "Server" : "Client");
	134	exit_cleanup(RERR_PROTOCOL);
	135	}
	136	if (protocol_version > PROTOCOL_VERSION) {
	137	rprintf(FERROR, "--protocol must be no more than %d on the %s.\n",
	138	PROTOCOL_VERSION, am_server? "Server" : "Client");
	139	exit_cleanup(RERR_PROTOCOL);
	140	}
1b2db7ae	141
771d0add WD	142	if (protocol_version < 30) {
	143	if (max_delete == 0 && am_sender) {
	144	rprintf(FERROR,
	145	"--max-delete=0 requires protocol 30 or higher"
	146	" (negotiated %d).\n",
	147	protocol_version);
	148	exit_cleanup(RERR_PROTOCOL);
	149	}
01894cf0	150	if (preserve_acls && !local_server) {
1c3344a1 WD	151	rprintf(FERROR,
	152	"--acls requires protocol 30 or higher"
	153	" (negotiated %d).\n",
	154	protocol_version);
	155	exit_cleanup(RERR_PROTOCOL);
	156	}
01894cf0	157	if (preserve_xattrs && !local_server) {
16edf865 WD	158	rprintf(FERROR,
	159	"--xattrs requires protocol 30 or higher"
	160	" (negotiated %d).\n",
	161	protocol_version);
	162	exit_cleanup(RERR_PROTOCOL);
	163	}
771d0add WD	164	}
771d0add WD	165
e4b619b4 WD	166	if (delete_mode && !(delete_before+delete_during+delete_after)) {
	167	if (protocol_version < 30)
	168	delete_before = 1;
	169	else
	170	delete_during = 1;
	171	}
	172
a1cc199b WD	173	if (protocol_version < 29) {
	174	if (fuzzy_basis) {
	175	rprintf(FERROR,
	176	"--fuzzy requires protocol 29 or higher"
	177	" (negotiated %d).\n",
	178	protocol_version);
	179	exit_cleanup(RERR_PROTOCOL);
	180	}
e461b9be	181
a1cc199b WD	182	if (basis_dir_cnt && inplace) {
	183	rprintf(FERROR,
	184	"%s with --inplace requires protocol 29 or higher"
	185	" (negotiated %d).\n",
	186	dest_option, protocol_version);
	187	exit_cleanup(RERR_PROTOCOL);
	188	}
57b12568	189
a1cc199b WD	190	if (basis_dir_cnt > 1) {
	191	rprintf(FERROR,
	192	"Using more than one %s option requires protocol"
	193	" 29 or higher (negotiated %d).\n",
	194	dest_option, protocol_version);
	195	exit_cleanup(RERR_PROTOCOL);
	196	}
	197
	198	if (prune_empty_dirs) {
	199	rprintf(FERROR,
	200	"--prune-empty-dirs requires protocol 29 or higher"
	201	" (negotiated %d).\n",
	202	protocol_version);
	203	exit_cleanup(RERR_PROTOCOL);
	204	}
e4b619b4	205	} else if (protocol_version >= 30) {
5275029d WD	206	if (recurse && allow_inc_recurse && !preserve_hard_links
	207	&& !delete_before && !delete_after && !delay_updates
	208	&& !prune_empty_dirs)
3ea6e0e7	209	inc_recurse = 1;
e4b619b4	210	need_messages_from_generator = 1;
57b12568 WD	211	}
57b12568 WD	212
d0c59b0e	213	if (partial_dir && *partial_dir != '/' && (!am_server \|\| local_server)) {
c1289508 WD	214	int flags = MATCHFLG_NO_PREFIXES \| MATCHFLG_DIRECTORY;
	215	if (!am_sender \|\| protocol_version >= 30)
	216	flags \|= MATCHFLG_PERISHABLE;
	217	parse_rule(&filter_list, partial_dir, flags, 0);
	218	}
	219
bc63ae3f	220	if (am_server) {
b1bf649c	221	if (!checksum_seed)
13c5fc0e	222	checksum_seed = time(NULL);
b1bf649c	223	write_int(f_out, checksum_seed);
bc63ae3f S	224	} else {
bc63ae3f S	225	checksum_seed = read_int(f_in);
13c5fc0e	226	}
4fe159a8	227	}