[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 as published by
 * the Free Software Foundation; either version 3 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, 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 relative_paths;
extern int append_mode;
extern int fuzzy_basis;
extern int read_batch;
extern int implied_dirs;
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 (append_mode == 1)
			append_mode = 2;
		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
		 && (!relative_paths || implied_dirs) && !use_qsort
		 && !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
8e41b68e WD	9	* it under the terms of the GNU General Public License as published by
	10	* the Free Software Foundation; either version 3 of the License, or
	11	* (at your option) any later version.
0f78b815 WD	12	*
	13	* This program is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	* GNU General Public License for more details.
	17	*
e7c67065	18	* You should have received a copy of the GNU General Public License along
4fd842f9	19	* with this program; if not, visit the http://fsf.org website.
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;
c8e83946	34	extern int use_qsort;
5275029d	35	extern int allow_inc_recurse;
79cd0c7f	36	extern int relative_paths;
77502cba	37	extern int append_mode;
e461b9be	38	extern int fuzzy_basis;
b9f592fb	39	extern int read_batch;
79cd0c7f	40	extern int implied_dirs;
e4b619b4	41	extern int delay_updates;
aae43eb3	42	extern int checksum_seed;
57b12568	43	extern int basis_dir_cnt;
a1cc199b	44	extern int prune_empty_dirs;
8a9709de	45	extern int protocol_version;
99a957d3 WD	46	extern int preserve_uid;
99a957d3 WD	47	extern int preserve_gid;
1c3344a1	48	extern int preserve_acls;
16edf865	49	extern int preserve_xattrs;
e4b619b4 WD	50	extern int preserve_hard_links;
	51	extern int need_messages_from_generator;
	52	extern int delete_mode, delete_before, delete_during, delete_after;
c1289508 WD	53	extern int delete_excluded;
c1289508 WD	54	extern int make_backups;
486f8cd1	55	extern char shell_cmd; / contains VER.SUB string if client is a pre-release */
c1289508 WD	56	extern char backup_dir, backup_suffix;
c1289508 WD	57	extern char *partial_dir;
57b12568	58	extern char *dest_option;
c1289508	59	extern struct filter_list_struct filter_list;
4fe159a8	60
9742b386 WD	61	/* These index values are for the file-list's extra-attribute array. */
	62	int uid_ndx, gid_ndx, acls_ndx, xattrs_ndx;
	63
486f8cd1 WD	64	/* The server makes sure that if either side only supports a pre-release
	65	* version of a protocol, that both sides must speak a compatible version
	66	* of that protocol for it to be advertised as available. */
	67	static void check_sub_protocol(void)
	68	{
	69	char *dot;
	70	int their_protocol, their_sub;
	71	int our_sub = protocol_version < PROTOCOL_VERSION ? 0 : SUBPROTOCOL_VERSION;
	72
	73	if (!shell_cmd \|\| !(dot = strchr(shell_cmd, '.'))
	74	\|\| !(their_protocol = atoi(shell_cmd))
	75	\|\| !(their_sub = atoi(dot+1))) {
	76	if (our_sub)
	77	protocol_version--;
	78	return;
	79	}
	80
	81	if (their_protocol < protocol_version) {
	82	if (their_sub)
	83	protocol_version = their_protocol - 1;
	84	return;
	85	}
	86
	87	if (their_protocol > protocol_version)
	88	their_sub = 0; /* 0 == final version */
	89	if (their_sub != our_sub)
	90	protocol_version--;
	91	}
	92
aae43eb3	93	void setup_protocol(int f_out,int f_in)
4fe159a8	94	{
6eee13cf	95	if (am_sender)
99a957d3	96	file_extra_cnt += PTR_EXTRA_LEN;
6eee13cf	97	else
99a957d3	98	file_extra_cnt++;
6eee13cf	99	if (preserve_uid)
9742b386	100	uid_ndx = ++file_extra_cnt;
6eee13cf	101	if (preserve_gid)
9742b386	102	gid_ndx = ++file_extra_cnt;
1c3344a1	103	if (preserve_acls && !am_sender)
9742b386	104	acls_ndx = ++file_extra_cnt;
16edf865	105	if (preserve_xattrs)
9742b386	106	xattrs_ndx = ++file_extra_cnt;
6eee13cf	107
8a9709de	108	if (remote_protocol == 0) {
486f8cd1 WD	109	if (am_server && !local_server)
486f8cd1 WD	110	check_sub_protocol();
aa434321	111	if (!read_batch)
8a9709de	112	write_int(f_out, protocol_version);
aa434321	113	remote_protocol = read_int(f_in);
8a9709de WD	114	if (protocol_version > remote_protocol)
8a9709de WD	115	protocol_version = remote_protocol;
13c5fc0e	116	}
b9f592fb	117	if (read_batch && remote_protocol > protocol_version) {
486f8cd1	118	rprintf(FERROR, "The protocol version in the batch file is too new (%d > %d).\n",
b9f592fb WD	119	remote_protocol, protocol_version);
	120	exit_cleanup(RERR_PROTOCOL);
	121	}
aae43eb3	122
8a9709de WD	123	if (verbose > 3) {
	124	rprintf(FINFO, "(%s) Protocol versions: remote=%d, negotiated=%d\n",
	125	am_server? "Server" : "Client", remote_protocol, protocol_version);
	126	}
	127	if (remote_protocol < MIN_PROTOCOL_VERSION
	128	\|\| remote_protocol > MAX_PROTOCOL_VERSION) {
4ccfd96c	129	rprintf(FERROR,"protocol version mismatch -- is your shell clean?\n");
d310a212	130	rprintf(FERROR,"(see the rsync man page for an explanation)\n");
65417579	131	exit_cleanup(RERR_PROTOCOL);
8a9709de WD	132	}
8a9709de WD	133	if (remote_protocol < OLD_PROTOCOL_VERSION) {
1b2db7ae	134	rprintf(FINFO,"%s is very old version of rsync, upgrade recommended.\n",
8a9709de WD	135	am_server? "Client" : "Server");
	136	}
	137	if (protocol_version < MIN_PROTOCOL_VERSION) {
	138	rprintf(FERROR, "--protocol must be at least %d on the %s.\n",
	139	MIN_PROTOCOL_VERSION, am_server? "Server" : "Client");
	140	exit_cleanup(RERR_PROTOCOL);
	141	}
	142	if (protocol_version > PROTOCOL_VERSION) {
	143	rprintf(FERROR, "--protocol must be no more than %d on the %s.\n",
	144	PROTOCOL_VERSION, am_server? "Server" : "Client");
	145	exit_cleanup(RERR_PROTOCOL);
	146	}
1b2db7ae	147
771d0add	148	if (protocol_version < 30) {
77502cba WD	149	if (append_mode == 1)
77502cba WD	150	append_mode = 2;
01894cf0	151	if (preserve_acls && !local_server) {
1c3344a1 WD	152	rprintf(FERROR,
	153	"--acls requires protocol 30 or higher"
	154	" (negotiated %d).\n",
	155	protocol_version);
	156	exit_cleanup(RERR_PROTOCOL);
	157	}
01894cf0	158	if (preserve_xattrs && !local_server) {
16edf865 WD	159	rprintf(FERROR,
	160	"--xattrs requires protocol 30 or higher"
	161	" (negotiated %d).\n",
	162	protocol_version);
	163	exit_cleanup(RERR_PROTOCOL);
	164	}
771d0add WD	165	}
771d0add WD	166
e4b619b4 WD	167	if (delete_mode && !(delete_before+delete_during+delete_after)) {
	168	if (protocol_version < 30)
	169	delete_before = 1;
	170	else
	171	delete_during = 1;
	172	}
	173
a1cc199b WD	174	if (protocol_version < 29) {
	175	if (fuzzy_basis) {
	176	rprintf(FERROR,
	177	"--fuzzy requires protocol 29 or higher"
	178	" (negotiated %d).\n",
	179	protocol_version);
	180	exit_cleanup(RERR_PROTOCOL);
	181	}
e461b9be	182
a1cc199b WD	183	if (basis_dir_cnt && inplace) {
	184	rprintf(FERROR,
	185	"%s with --inplace requires protocol 29 or higher"
	186	" (negotiated %d).\n",
	187	dest_option, protocol_version);
	188	exit_cleanup(RERR_PROTOCOL);
	189	}
57b12568	190
a1cc199b WD	191	if (basis_dir_cnt > 1) {
	192	rprintf(FERROR,
	193	"Using more than one %s option requires protocol"
	194	" 29 or higher (negotiated %d).\n",
	195	dest_option, protocol_version);
	196	exit_cleanup(RERR_PROTOCOL);
	197	}
	198
	199	if (prune_empty_dirs) {
	200	rprintf(FERROR,
	201	"--prune-empty-dirs requires protocol 29 or higher"
	202	" (negotiated %d).\n",
	203	protocol_version);
	204	exit_cleanup(RERR_PROTOCOL);
	205	}
e4b619b4	206	} else if (protocol_version >= 30) {
5275029d WD	207	if (recurse && allow_inc_recurse && !preserve_hard_links
5275029d WD	208	&& !delete_before && !delete_after && !delay_updates
79cd0c7f WD	209	&& (!relative_paths \|\| implied_dirs) && !use_qsort
79cd0c7f WD	210	&& !prune_empty_dirs)
3ea6e0e7	211	inc_recurse = 1;
e4b619b4	212	need_messages_from_generator = 1;
57b12568 WD	213	}
57b12568 WD	214
d0c59b0e	215	if (partial_dir && *partial_dir != '/' && (!am_server \|\| local_server)) {
c1289508 WD	216	int flags = MATCHFLG_NO_PREFIXES \| MATCHFLG_DIRECTORY;
	217	if (!am_sender \|\| protocol_version >= 30)
	218	flags \|= MATCHFLG_PERISHABLE;
	219	parse_rule(&filter_list, partial_dir, flags, 0);
	220	}
	221
bc63ae3f	222	if (am_server) {
b1bf649c	223	if (!checksum_seed)
13c5fc0e	224	checksum_seed = time(NULL);
b1bf649c	225	write_int(f_out, checksum_seed);
bc63ae3f S	226	} else {
bc63ae3f S	227	checksum_seed = read_int(f_in);
13c5fc0e	228	}
4fe159a8	229	}