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d8cc8daef9
need...but most of it remains.
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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