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https://github.com/RsyncProject/rsync.git
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ff08acd4f2
I added a compatibility flag for protocol 31 that will let both sides know if they should be using the xattr optimization that attempted to avoid sending xattr info for hardlinked files. Since this optimization was causing some issues, this compatibility flag will ensure that both sides know if they should be trying to use the optimization or not.
337 lines
9.6 KiB
C
337 lines
9.6 KiB
C
/*
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* Compatibility routines for older rsync protocol versions.
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*
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* Copyright (C) Andrew Tridgell 1996
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* Copyright (C) Paul Mackerras 1996
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* Copyright (C) 2004-2014 Wayne Davison
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, visit the http://fsf.org website.
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*/
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#include "rsync.h"
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int remote_protocol = 0;
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int file_extra_cnt = 0; /* count of file-list extras that everyone gets */
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int inc_recurse = 0;
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int compat_flags = 0;
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int use_safe_inc_flist = 0;
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int want_xattr_optim = 0;
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extern int am_server;
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extern int am_sender;
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extern int local_server;
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extern int inplace;
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extern int recurse;
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extern int use_qsort;
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extern int allow_inc_recurse;
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extern int preallocate_files;
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extern int append_mode;
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extern int fuzzy_basis;
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extern int read_batch;
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extern int delay_updates;
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extern int checksum_seed;
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extern int basis_dir_cnt;
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extern int prune_empty_dirs;
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extern int protocol_version;
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extern int protect_args;
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extern int preserve_uid;
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extern int preserve_gid;
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extern int preserve_acls;
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extern int preserve_xattrs;
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extern int need_messages_from_generator;
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extern int delete_mode, delete_before, delete_during, delete_after;
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extern char *shell_cmd;
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extern char *partial_dir;
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extern char *dest_option;
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extern char *files_from;
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extern char *filesfrom_host;
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extern filter_rule_list filter_list;
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extern int need_unsorted_flist;
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#ifdef ICONV_OPTION
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extern iconv_t ic_send, ic_recv;
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extern char *iconv_opt;
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#endif
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/* These index values are for the file-list's extra-attribute array. */
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int uid_ndx, gid_ndx, acls_ndx, xattrs_ndx, unsort_ndx;
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int receiver_symlink_times = 0; /* receiver can set the time on a symlink */
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int sender_symlink_iconv = 0; /* sender should convert symlink content */
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#ifdef ICONV_OPTION
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int filesfrom_convert = 0;
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#endif
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#define CF_INC_RECURSE (1<<0)
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#define CF_SYMLINK_TIMES (1<<1)
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#define CF_SYMLINK_ICONV (1<<2)
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#define CF_SAFE_FLIST (1<<3)
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#define CF_AVOID_XATTR_OPTIM (1<<4)
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static const char *client_info;
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/* The server makes sure that if either side only supports a pre-release
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* version of a protocol, that both sides must speak a compatible version
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* of that protocol for it to be advertised as available. */
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static void check_sub_protocol(void)
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{
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char *dot;
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int their_protocol, their_sub;
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#if SUBPROTOCOL_VERSION != 0
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int our_sub = protocol_version < PROTOCOL_VERSION ? 0 : SUBPROTOCOL_VERSION;
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#else
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int our_sub = 0;
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#endif
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/* client_info starts with VER.SUB string if client is a pre-release. */
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if (!(their_protocol = atoi(client_info))
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|| !(dot = strchr(client_info, '.'))
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|| !(their_sub = atoi(dot+1))) {
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#if SUBPROTOCOL_VERSION != 0
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if (our_sub)
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protocol_version--;
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#endif
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return;
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}
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if (their_protocol < protocol_version) {
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if (their_sub)
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protocol_version = their_protocol - 1;
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return;
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}
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if (their_protocol > protocol_version)
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their_sub = 0; /* 0 == final version of older protocol */
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if (their_sub != our_sub)
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protocol_version--;
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}
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void set_allow_inc_recurse(void)
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{
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client_info = shell_cmd ? shell_cmd : "";
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if (!recurse || use_qsort)
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allow_inc_recurse = 0;
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else if (!am_sender
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&& (delete_before || delete_after
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|| delay_updates || prune_empty_dirs))
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allow_inc_recurse = 0;
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else if (am_server && !local_server
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&& (strchr(client_info, 'i') == NULL))
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allow_inc_recurse = 0;
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}
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void setup_protocol(int f_out,int f_in)
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{
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if (am_sender)
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file_extra_cnt += PTR_EXTRA_CNT;
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else
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file_extra_cnt++;
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if (preserve_uid)
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uid_ndx = ++file_extra_cnt;
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if (preserve_gid)
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gid_ndx = ++file_extra_cnt;
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if (preserve_acls && !am_sender)
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acls_ndx = ++file_extra_cnt;
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if (preserve_xattrs)
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xattrs_ndx = ++file_extra_cnt;
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if (am_server)
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set_allow_inc_recurse();
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if (remote_protocol == 0) {
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if (am_server && !local_server)
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check_sub_protocol();
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if (!read_batch)
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write_int(f_out, protocol_version);
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remote_protocol = read_int(f_in);
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if (protocol_version > remote_protocol)
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protocol_version = remote_protocol;
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}
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if (read_batch && remote_protocol > protocol_version) {
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rprintf(FERROR, "The protocol version in the batch file is too new (%d > %d).\n",
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remote_protocol, protocol_version);
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exit_cleanup(RERR_PROTOCOL);
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}
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if (DEBUG_GTE(PROTO, 1)) {
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rprintf(FINFO, "(%s) Protocol versions: remote=%d, negotiated=%d\n",
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am_server? "Server" : "Client", remote_protocol, protocol_version);
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}
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if (remote_protocol < MIN_PROTOCOL_VERSION
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|| remote_protocol > MAX_PROTOCOL_VERSION) {
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rprintf(FERROR,"protocol version mismatch -- is your shell clean?\n");
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rprintf(FERROR,"(see the rsync man page for an explanation)\n");
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exit_cleanup(RERR_PROTOCOL);
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}
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if (remote_protocol < OLD_PROTOCOL_VERSION) {
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rprintf(FINFO,"%s is very old version of rsync, upgrade recommended.\n",
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am_server? "Client" : "Server");
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}
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if (protocol_version < MIN_PROTOCOL_VERSION) {
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rprintf(FERROR, "--protocol must be at least %d on the %s.\n",
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MIN_PROTOCOL_VERSION, am_server? "Server" : "Client");
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exit_cleanup(RERR_PROTOCOL);
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}
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if (protocol_version > PROTOCOL_VERSION) {
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rprintf(FERROR, "--protocol must be no more than %d on the %s.\n",
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PROTOCOL_VERSION, am_server? "Server" : "Client");
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exit_cleanup(RERR_PROTOCOL);
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}
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if (read_batch)
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check_batch_flags();
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#ifndef SUPPORT_PREALLOCATION
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if (preallocate_files && !am_sender) {
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rprintf(FERROR, "preallocation is not supported on this %s\n",
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am_server ? "Server" : "Client");
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exit_cleanup(RERR_SYNTAX);
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}
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#endif
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if (protocol_version < 30) {
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if (append_mode == 1)
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append_mode = 2;
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if (preserve_acls && !local_server) {
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rprintf(FERROR,
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"--acls requires protocol 30 or higher"
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" (negotiated %d).\n",
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protocol_version);
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exit_cleanup(RERR_PROTOCOL);
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}
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if (preserve_xattrs && !local_server) {
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rprintf(FERROR,
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"--xattrs requires protocol 30 or higher"
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" (negotiated %d).\n",
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protocol_version);
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exit_cleanup(RERR_PROTOCOL);
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}
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}
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if (delete_mode && !(delete_before+delete_during+delete_after)) {
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if (protocol_version < 30)
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delete_before = 1;
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else
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delete_during = 1;
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}
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if (protocol_version < 29) {
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if (fuzzy_basis) {
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rprintf(FERROR,
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"--fuzzy requires protocol 29 or higher"
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" (negotiated %d).\n",
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protocol_version);
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exit_cleanup(RERR_PROTOCOL);
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}
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if (basis_dir_cnt && inplace) {
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rprintf(FERROR,
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"%s with --inplace requires protocol 29 or higher"
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" (negotiated %d).\n",
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dest_option, protocol_version);
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exit_cleanup(RERR_PROTOCOL);
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}
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if (basis_dir_cnt > 1) {
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rprintf(FERROR,
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"Using more than one %s option requires protocol"
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" 29 or higher (negotiated %d).\n",
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dest_option, protocol_version);
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exit_cleanup(RERR_PROTOCOL);
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}
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if (prune_empty_dirs) {
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rprintf(FERROR,
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"--prune-empty-dirs requires protocol 29 or higher"
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" (negotiated %d).\n",
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protocol_version);
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exit_cleanup(RERR_PROTOCOL);
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}
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} else if (protocol_version >= 30) {
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if (am_server) {
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compat_flags = allow_inc_recurse ? CF_INC_RECURSE : 0;
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#ifdef CAN_SET_SYMLINK_TIMES
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compat_flags |= CF_SYMLINK_TIMES;
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#endif
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#ifdef ICONV_OPTION
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compat_flags |= CF_SYMLINK_ICONV;
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#endif
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if (local_server || strchr(client_info, 'f') != NULL)
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compat_flags |= CF_SAFE_FLIST;
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if (local_server || strchr(client_info, 'x') != NULL)
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compat_flags |= CF_AVOID_XATTR_OPTIM;
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write_byte(f_out, compat_flags);
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} else
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compat_flags = read_byte(f_in);
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/* The inc_recurse var MUST be set to 0 or 1. */
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inc_recurse = compat_flags & CF_INC_RECURSE ? 1 : 0;
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want_xattr_optim = protocol_version >= 31 && !(compat_flags & CF_AVOID_XATTR_OPTIM);
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if (am_sender) {
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receiver_symlink_times = am_server
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? strchr(client_info, 'L') != NULL
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: !!(compat_flags & CF_SYMLINK_TIMES);
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}
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#ifdef CAN_SET_SYMLINK_TIMES
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else
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receiver_symlink_times = 1;
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#endif
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#ifdef ICONV_OPTION
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sender_symlink_iconv = iconv_opt && (am_server
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? local_server || strchr(client_info, 's') != NULL
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: !!(compat_flags & CF_SYMLINK_ICONV));
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#endif
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if (inc_recurse && !allow_inc_recurse) {
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/* This should only be able to happen in a batch. */
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fprintf(stderr,
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"Incompatible options specified for inc-recursive %s.\n",
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read_batch ? "batch file" : "connection");
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exit_cleanup(RERR_SYNTAX);
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}
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use_safe_inc_flist = (compat_flags & CF_SAFE_FLIST) || protocol_version >= 31;
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need_messages_from_generator = 1;
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#ifdef CAN_SET_SYMLINK_TIMES
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} else if (!am_sender) {
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receiver_symlink_times = 1;
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#endif
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}
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if (need_unsorted_flist && (!am_sender || inc_recurse))
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unsort_ndx = ++file_extra_cnt;
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if (partial_dir && *partial_dir != '/' && (!am_server || local_server)) {
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int rflags = FILTRULE_NO_PREFIXES | FILTRULE_DIRECTORY;
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if (!am_sender || protocol_version >= 30)
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rflags |= FILTRULE_PERISHABLE;
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parse_filter_str(&filter_list, partial_dir, rule_template(rflags), 0);
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}
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#ifdef ICONV_OPTION
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if (protect_args && files_from) {
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if (am_sender)
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filesfrom_convert = filesfrom_host && ic_send != (iconv_t)-1;
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else
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filesfrom_convert = !filesfrom_host && ic_recv != (iconv_t)-1;
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}
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#endif
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if (am_server) {
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if (!checksum_seed)
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checksum_seed = time(NULL);
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write_int(f_out, checksum_seed);
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} else {
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checksum_seed = read_int(f_in);
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}
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}
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