You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
 
 
 
 
 
 

336 lines
9.6 KiB

/*
* Compatibility routines for older rsync protocol versions.
*
* Copyright (C) Andrew Tridgell 1996
* Copyright (C) Paul Mackerras 1996
* Copyright (C) 2004-2014 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;
int compat_flags = 0;
int use_safe_inc_flist = 0;
int want_xattr_optim = 0;
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 preallocate_files;
extern int append_mode;
extern int fuzzy_basis;
extern int read_batch;
extern int delay_updates;
extern int checksum_seed;
extern int basis_dir_cnt;
extern int prune_empty_dirs;
extern int protocol_version;
extern int protect_args;
extern int preserve_uid;
extern int preserve_gid;
extern int preserve_acls;
extern int preserve_xattrs;
extern int need_messages_from_generator;
extern int delete_mode, delete_before, delete_during, delete_after;
extern char *shell_cmd;
extern char *partial_dir;
extern char *dest_option;
extern char *files_from;
extern char *filesfrom_host;
extern filter_rule_list filter_list;
extern int need_unsorted_flist;
#ifdef ICONV_OPTION
extern iconv_t ic_send, ic_recv;
extern char *iconv_opt;
#endif
/* These index values are for the file-list's extra-attribute array. */
int uid_ndx, gid_ndx, acls_ndx, xattrs_ndx, unsort_ndx;
int receiver_symlink_times = 0; /* receiver can set the time on a symlink */
int sender_symlink_iconv = 0; /* sender should convert symlink content */
#ifdef ICONV_OPTION
int filesfrom_convert = 0;
#endif
#define CF_INC_RECURSE (1<<0)
#define CF_SYMLINK_TIMES (1<<1)
#define CF_SYMLINK_ICONV (1<<2)
#define CF_SAFE_FLIST (1<<3)
#define CF_AVOID_XATTR_OPTIM (1<<4)
static const char *client_info;
/* 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;
#if SUBPROTOCOL_VERSION != 0
int our_sub = protocol_version < PROTOCOL_VERSION ? 0 : SUBPROTOCOL_VERSION;
#else
int our_sub = 0;
#endif
/* client_info starts with VER.SUB string if client is a pre-release. */
if (!(their_protocol = atoi(client_info))
|| !(dot = strchr(client_info, '.'))
|| !(their_sub = atoi(dot+1))) {
#if SUBPROTOCOL_VERSION != 0
if (our_sub)
protocol_version--;
#endif
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 of older protocol */
if (their_sub != our_sub)
protocol_version--;
}
void set_allow_inc_recurse(void)
{
client_info = shell_cmd ? shell_cmd : "";
if (!recurse || use_qsort)
allow_inc_recurse = 0;
else if (!am_sender
&& (delete_before || delete_after
|| delay_updates || prune_empty_dirs))
allow_inc_recurse = 0;
else if (am_server && !local_server
&& (strchr(client_info, 'i') == NULL))
allow_inc_recurse = 0;
}
void setup_protocol(int f_out,int f_in)
{
if (am_sender)
file_extra_cnt += PTR_EXTRA_CNT;
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 (am_server)
set_allow_inc_recurse();
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 (DEBUG_GTE(PROTO, 1)) {
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 (read_batch)
check_batch_flags();
#ifndef SUPPORT_PREALLOCATION
if (preallocate_files && !am_sender) {
rprintf(FERROR, "preallocation is not supported on this %s\n",
am_server ? "Server" : "Client");
exit_cleanup(RERR_SYNTAX);
}
#endif
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 (am_server) {
compat_flags = allow_inc_recurse ? CF_INC_RECURSE : 0;
#ifdef CAN_SET_SYMLINK_TIMES
compat_flags |= CF_SYMLINK_TIMES;
#endif
#ifdef ICONV_OPTION
compat_flags |= CF_SYMLINK_ICONV;
#endif
if (local_server || strchr(client_info, 'f') != NULL)
compat_flags |= CF_SAFE_FLIST;
if (local_server || strchr(client_info, 'x') != NULL)
compat_flags |= CF_AVOID_XATTR_OPTIM;
write_byte(f_out, compat_flags);
} else
compat_flags = read_byte(f_in);
/* The inc_recurse var MUST be set to 0 or 1. */
inc_recurse = compat_flags & CF_INC_RECURSE ? 1 : 0;
want_xattr_optim = protocol_version >= 31 && !(compat_flags & CF_AVOID_XATTR_OPTIM);
if (am_sender) {
receiver_symlink_times = am_server
? strchr(client_info, 'L') != NULL
: !!(compat_flags & CF_SYMLINK_TIMES);
}
#ifdef CAN_SET_SYMLINK_TIMES
else
receiver_symlink_times = 1;
#endif
#ifdef ICONV_OPTION
sender_symlink_iconv = iconv_opt && (am_server
? local_server || strchr(client_info, 's') != NULL
: !!(compat_flags & CF_SYMLINK_ICONV));
#endif
if (inc_recurse && !allow_inc_recurse) {
/* This should only be able to happen in a batch. */
fprintf(stderr,
"Incompatible options specified for inc-recursive %s.\n",
read_batch ? "batch file" : "connection");
exit_cleanup(RERR_SYNTAX);
}
use_safe_inc_flist = (compat_flags & CF_SAFE_FLIST) || protocol_version >= 31;
need_messages_from_generator = 1;
#ifdef CAN_SET_SYMLINK_TIMES
} else if (!am_sender) {
receiver_symlink_times = 1;
#endif
}
if (need_unsorted_flist && (!am_sender || inc_recurse))
unsort_ndx = ++file_extra_cnt;
if (partial_dir && *partial_dir != '/' && (!am_server || local_server)) {
int rflags = FILTRULE_NO_PREFIXES | FILTRULE_DIRECTORY;
if (!am_sender || protocol_version >= 30)
rflags |= FILTRULE_PERISHABLE;
parse_filter_str(&filter_list, partial_dir, rule_template(rflags), 0);
}
#ifdef ICONV_OPTION
if (protect_args && files_from) {
if (am_sender)
filesfrom_convert = filesfrom_host && ic_send != (iconv_t)-1;
else
filesfrom_convert = !filesfrom_host && ic_recv != (iconv_t)-1;
}
#endif
if (am_server) {
if (!checksum_seed)
checksum_seed = time(NULL);
write_int(f_out, checksum_seed);
} else {
checksum_seed = read_int(f_in);
}
}