compat.c

   1 /*
   2  * Compatibility routines for older rsync protocol versions.
   3  *
   4  * Copyright (C) Andrew Tridgell 1996
   5  * Copyright (C) Paul Mackerras 1996
   6  * Copyright (C) 2004-2007 Wayne Davison
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  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  *
  17  * You should have received a copy of the GNU General Public License along
  18  * with this program; if not, write to the Free Software Foundation, Inc.,
  19  * 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.
  20  */
  21
  22 #include "rsync.h"
  23
  24 int remote_protocol = 0;
  25 int file_extra_cnt = 0; /* count of file-list extras that everyone gets */
  26 int inc_recurse = 0;
  27
  28 extern int verbose;
  29 extern int am_server;
  30 extern int am_sender;
  31 extern int inplace;
  32 extern int recurse;
  33 extern int fuzzy_basis;
  34 extern int read_batch;
  35 extern int max_delete;
  36 extern int delay_updates;
  37 extern int checksum_seed;
  38 extern int basis_dir_cnt;
  39 extern int prune_empty_dirs;
  40 extern int protocol_version;
  41 extern int preserve_uid;
  42 extern int preserve_gid;
  43 extern int preserve_hard_links;
  44 extern int need_messages_from_generator;
  45 extern int delete_mode, delete_before, delete_during, delete_after;
  46 extern int delete_excluded;
  47 extern int make_backups;
  48 extern char *backup_dir, *backup_suffix;
  49 extern char *partial_dir;
  50 extern char *dest_option;
  51 extern struct filter_list_struct filter_list;
  52
  53 void setup_protocol(int f_out,int f_in)
  54 {
  55         if (am_sender)
  56                 file_extra_cnt += PTR_EXTRA_LEN;
  57         else
  58                 file_extra_cnt++;
  59         if (preserve_uid)
  60                 preserve_uid = ++file_extra_cnt;
  61         if (preserve_gid)
  62                 preserve_gid = ++file_extra_cnt;
  63
  64         if (remote_protocol == 0) {
  65                 if (!read_batch)
  66                         write_int(f_out, protocol_version);
  67                 remote_protocol = read_int(f_in);
  68                 if (protocol_version > remote_protocol)
  69                         protocol_version = remote_protocol;
  70         }
  71         if (read_batch && remote_protocol > protocol_version) {
  72                 rprintf(FERROR, "The protocol version in the batch file is too new (%d > %d).\n",
  73                         remote_protocol, protocol_version);
  74                 exit_cleanup(RERR_PROTOCOL);
  75         }
  76
  77         if (verbose > 3) {
  78                 rprintf(FINFO, "(%s) Protocol versions: remote=%d, negotiated=%d\n",
  79                         am_server? "Server" : "Client", remote_protocol, protocol_version);
  80         }
  81         if (remote_protocol < MIN_PROTOCOL_VERSION
  82          || remote_protocol > MAX_PROTOCOL_VERSION) {
  83                 rprintf(FERROR,"protocol version mismatch -- is your shell clean?\n");
  84                 rprintf(FERROR,"(see the rsync man page for an explanation)\n");
  85                 exit_cleanup(RERR_PROTOCOL);
  86         }
  87         if (remote_protocol < OLD_PROTOCOL_VERSION) {
  88                 rprintf(FINFO,"%s is very old version of rsync, upgrade recommended.\n",
  89                         am_server? "Client" : "Server");
  90         }
  91         if (protocol_version < MIN_PROTOCOL_VERSION) {
  92                 rprintf(FERROR, "--protocol must be at least %d on the %s.\n",
  93                         MIN_PROTOCOL_VERSION, am_server? "Server" : "Client");
  94                 exit_cleanup(RERR_PROTOCOL);
  95         }
  96         if (protocol_version > PROTOCOL_VERSION) {
  97                 rprintf(FERROR, "--protocol must be no more than %d on the %s.\n",
  98                         PROTOCOL_VERSION, am_server? "Server" : "Client");
  99                 exit_cleanup(RERR_PROTOCOL);
 100         }
 101
 102         if (protocol_version < 30) {
 103                 if (max_delete == 0 && am_sender) {
 104                         rprintf(FERROR,
 105                             "--max-delete=0 requires protocol 30 or higher"
 106                             " (negotiated %d).\n",
 107                             protocol_version);
 108                         exit_cleanup(RERR_PROTOCOL);
 109                 }
 110         }
 111
 112         if (delete_mode && !(delete_before+delete_during+delete_after)) {
 113                 if (protocol_version < 30)
 114                         delete_before = 1;
 115                 else
 116                         delete_during = 1;
 117         }
 118
 119         if (protocol_version < 29) {
 120                 if (fuzzy_basis) {
 121                         rprintf(FERROR,
 122                             "--fuzzy requires protocol 29 or higher"
 123                             " (negotiated %d).\n",
 124                             protocol_version);
 125                         exit_cleanup(RERR_PROTOCOL);
 126                 }
 127
 128                 if (basis_dir_cnt && inplace) {
 129                         rprintf(FERROR,
 130                             "%s with --inplace requires protocol 29 or higher"
 131                             " (negotiated %d).\n",
 132                             dest_option, protocol_version);
 133                         exit_cleanup(RERR_PROTOCOL);
 134                 }
 135
 136                 if (basis_dir_cnt > 1) {
 137                         rprintf(FERROR,
 138                             "Using more than one %s option requires protocol"
 139                             " 29 or higher (negotiated %d).\n",
 140                             dest_option, protocol_version);
 141                         exit_cleanup(RERR_PROTOCOL);
 142                 }
 143
 144                 if (prune_empty_dirs) {
 145                         rprintf(FERROR,
 146                             "--prune-empty-dirs requires protocol 29 or higher"
 147                             " (negotiated %d).\n",
 148                             protocol_version);
 149                         exit_cleanup(RERR_PROTOCOL);
 150                 }
 151         } else if (protocol_version >= 30) {
 152                 if (recurse && !preserve_hard_links && !delete_before
 153                  && !delete_after && !delay_updates && !prune_empty_dirs)
 154                         inc_recurse = 1;
 155                 need_messages_from_generator = 1;
 156         }
 157
 158         if (make_backups && !backup_dir && delete_mode && !delete_excluded
 159          && !am_server) {
 160                 char *rule;
 161                 if (asprintf(&rule, "P%s *%s",
 162                             !am_sender || protocol_version >= 30 ? "p" : "",
 163                             backup_suffix) < 0)
 164                         out_of_memory("setup_protocol");
 165                 parse_rule(&filter_list, rule, 0, 0);
 166                 free(rule);
 167         }
 168         if (partial_dir && *partial_dir != '/' && !am_server) {
 169                 int flags = MATCHFLG_NO_PREFIXES | MATCHFLG_DIRECTORY;
 170                 if (!am_sender || protocol_version >= 30)
 171                         flags |= MATCHFLG_PERISHABLE;
 172                 parse_rule(&filter_list, partial_dir, flags, 0);
 173         }
 174
 175         if (am_server) {
 176                 if (!checksum_seed)
 177                         checksum_seed = time(NULL);
 178                 write_int(f_out, checksum_seed);
 179         } else {
 180                 checksum_seed = read_int(f_in);
 181         }
 182 }