[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 3 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, visit the http://fsf.org website.
 */

#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 use_qsort;
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;

/* These index values are for the file-list's extra-attribute array. */
int uid_ndx, gid_ndx, acls_ndx, xattrs_ndx;

/* 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)
		uid_ndx = ++file_extra_cnt;
	if (preserve_gid)
		gid_ndx = ++file_extra_cnt;
	if (preserve_acls && !am_sender)
		acls_ndx = ++file_extra_cnt;
	if (preserve_xattrs)
		xattrs_ndx = ++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 && !use_qsort)
			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
4fd842f9	9	* it under the terms of the GNU General Public License version 3 as
ba2133d6	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	17	* You should have received a copy of the GNU General Public License along
4fd842f9	18	* with this program; if not, visit the http://fsf.org website.
0f78b815	19	*/
4fe159a8 AT	20
	21	#include "rsync.h"
	22
8a9709de	23	int remote_protocol = 0;
99a957d3	24	int file_extra_cnt = 0; /* count of file-list extras that everyone gets */
3ea6e0e7	25	int inc_recurse = 0;
8a9709de	26
b9f592fb	27	extern int verbose;
aae43eb3	28	extern int am_server;
771d0add	29	extern int am_sender;
d0c59b0e	30	extern int local_server;
57b12568	31	extern int inplace;
e4b619b4	32	extern int recurse;
c8e83946	33	extern int use_qsort;
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
9742b386 WD	58	/* These index values are for the file-list's extra-attribute array. */
	59	int uid_ndx, gid_ndx, acls_ndx, xattrs_ndx;
	60
486f8cd1 WD	61	/* The server makes sure that if either side only supports a pre-release
	62	* version of a protocol, that both sides must speak a compatible version
	63	* of that protocol for it to be advertised as available. */
	64	static void check_sub_protocol(void)
	65	{
	66	char *dot;
	67	int their_protocol, their_sub;
	68	int our_sub = protocol_version < PROTOCOL_VERSION ? 0 : SUBPROTOCOL_VERSION;
	69
	70	if (!shell_cmd \|\| !(dot = strchr(shell_cmd, '.'))
	71	\|\| !(their_protocol = atoi(shell_cmd))
	72	\|\| !(their_sub = atoi(dot+1))) {
	73	if (our_sub)
	74	protocol_version--;
	75	return;
	76	}
	77
	78	if (their_protocol < protocol_version) {
	79	if (their_sub)
	80	protocol_version = their_protocol - 1;
	81	return;
	82	}
	83
	84	if (their_protocol > protocol_version)
	85	their_sub = 0; /* 0 == final version */
	86	if (their_sub != our_sub)
	87	protocol_version--;
	88	}
	89
aae43eb3	90	void setup_protocol(int f_out,int f_in)
4fe159a8	91	{
6eee13cf	92	if (am_sender)
99a957d3	93	file_extra_cnt += PTR_EXTRA_LEN;
6eee13cf	94	else
99a957d3	95	file_extra_cnt++;
6eee13cf	96	if (preserve_uid)
9742b386	97	uid_ndx = ++file_extra_cnt;
6eee13cf	98	if (preserve_gid)
9742b386	99	gid_ndx = ++file_extra_cnt;
1c3344a1	100	if (preserve_acls && !am_sender)
9742b386	101	acls_ndx = ++file_extra_cnt;
16edf865	102	if (preserve_xattrs)
9742b386	103	xattrs_ndx = ++file_extra_cnt;
6eee13cf	104
8a9709de	105	if (remote_protocol == 0) {
486f8cd1 WD	106	if (am_server && !local_server)
486f8cd1 WD	107	check_sub_protocol();
aa434321	108	if (!read_batch)
8a9709de	109	write_int(f_out, protocol_version);
aa434321	110	remote_protocol = read_int(f_in);
8a9709de WD	111	if (protocol_version > remote_protocol)
8a9709de WD	112	protocol_version = remote_protocol;
13c5fc0e	113	}
b9f592fb	114	if (read_batch && remote_protocol > protocol_version) {
486f8cd1	115	rprintf(FERROR, "The protocol version in the batch file is too new (%d > %d).\n",
b9f592fb WD	116	remote_protocol, protocol_version);
	117	exit_cleanup(RERR_PROTOCOL);
	118	}
aae43eb3	119
8a9709de WD	120	if (verbose > 3) {
	121	rprintf(FINFO, "(%s) Protocol versions: remote=%d, negotiated=%d\n",
	122	am_server? "Server" : "Client", remote_protocol, protocol_version);
	123	}
	124	if (remote_protocol < MIN_PROTOCOL_VERSION
	125	\|\| remote_protocol > MAX_PROTOCOL_VERSION) {
4ccfd96c	126	rprintf(FERROR,"protocol version mismatch -- is your shell clean?\n");
d310a212	127	rprintf(FERROR,"(see the rsync man page for an explanation)\n");
65417579	128	exit_cleanup(RERR_PROTOCOL);
8a9709de WD	129	}
8a9709de WD	130	if (remote_protocol < OLD_PROTOCOL_VERSION) {
1b2db7ae	131	rprintf(FINFO,"%s is very old version of rsync, upgrade recommended.\n",
8a9709de WD	132	am_server? "Client" : "Server");
	133	}
	134	if (protocol_version < MIN_PROTOCOL_VERSION) {
	135	rprintf(FERROR, "--protocol must be at least %d on the %s.\n",
	136	MIN_PROTOCOL_VERSION, am_server? "Server" : "Client");
	137	exit_cleanup(RERR_PROTOCOL);
	138	}
	139	if (protocol_version > PROTOCOL_VERSION) {
	140	rprintf(FERROR, "--protocol must be no more than %d on the %s.\n",
	141	PROTOCOL_VERSION, am_server? "Server" : "Client");
	142	exit_cleanup(RERR_PROTOCOL);
	143	}
1b2db7ae	144
771d0add WD	145	if (protocol_version < 30) {
	146	if (max_delete == 0 && am_sender) {
	147	rprintf(FERROR,
	148	"--max-delete=0 requires protocol 30 or higher"
	149	" (negotiated %d).\n",
	150	protocol_version);
	151	exit_cleanup(RERR_PROTOCOL);
	152	}
01894cf0	153	if (preserve_acls && !local_server) {
1c3344a1 WD	154	rprintf(FERROR,
	155	"--acls requires protocol 30 or higher"
	156	" (negotiated %d).\n",
	157	protocol_version);
	158	exit_cleanup(RERR_PROTOCOL);
	159	}
01894cf0	160	if (preserve_xattrs && !local_server) {
16edf865 WD	161	rprintf(FERROR,
	162	"--xattrs requires protocol 30 or higher"
	163	" (negotiated %d).\n",
	164	protocol_version);
	165	exit_cleanup(RERR_PROTOCOL);
	166	}
771d0add WD	167	}
771d0add WD	168
e4b619b4 WD	169	if (delete_mode && !(delete_before+delete_during+delete_after)) {
	170	if (protocol_version < 30)
	171	delete_before = 1;
	172	else
	173	delete_during = 1;
	174	}
	175
a1cc199b WD	176	if (protocol_version < 29) {
	177	if (fuzzy_basis) {
	178	rprintf(FERROR,
	179	"--fuzzy requires protocol 29 or higher"
	180	" (negotiated %d).\n",
	181	protocol_version);
	182	exit_cleanup(RERR_PROTOCOL);
	183	}
e461b9be	184
a1cc199b WD	185	if (basis_dir_cnt && inplace) {
	186	rprintf(FERROR,
	187	"%s with --inplace requires protocol 29 or higher"
	188	" (negotiated %d).\n",
	189	dest_option, protocol_version);
	190	exit_cleanup(RERR_PROTOCOL);
	191	}
57b12568	192
a1cc199b WD	193	if (basis_dir_cnt > 1) {
	194	rprintf(FERROR,
	195	"Using more than one %s option requires protocol"
	196	" 29 or higher (negotiated %d).\n",
	197	dest_option, protocol_version);
	198	exit_cleanup(RERR_PROTOCOL);
	199	}
	200
	201	if (prune_empty_dirs) {
	202	rprintf(FERROR,
	203	"--prune-empty-dirs requires protocol 29 or higher"
	204	" (negotiated %d).\n",
	205	protocol_version);
	206	exit_cleanup(RERR_PROTOCOL);
	207	}
e4b619b4	208	} else if (protocol_version >= 30) {
5275029d WD	209	if (recurse && allow_inc_recurse && !preserve_hard_links
5275029d WD	210	&& !delete_before && !delete_after && !delay_updates
c8e83946	211	&& !prune_empty_dirs && !use_qsort)
3ea6e0e7	212	inc_recurse = 1;
e4b619b4	213	need_messages_from_generator = 1;
57b12568 WD	214	}
57b12568 WD	215
d0c59b0e	216	if (partial_dir && *partial_dir != '/' && (!am_server \|\| local_server)) {
c1289508 WD	217	int flags = MATCHFLG_NO_PREFIXES \| MATCHFLG_DIRECTORY;
	218	if (!am_sender \|\| protocol_version >= 30)
	219	flags \|= MATCHFLG_PERISHABLE;
	220	parse_rule(&filter_list, partial_dir, flags, 0);
	221	}
	222
bc63ae3f	223	if (am_server) {
b1bf649c	224	if (!checksum_seed)
13c5fc0e	225	checksum_seed = time(NULL);
b1bf649c	226	write_int(f_out, checksum_seed);
bc63ae3f S	227	} else {
bc63ae3f S	228	checksum_seed = read_int(f_in);
13c5fc0e	229	}
4fe159a8	230	}