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 local_server;
  32 extern int inplace;
  33 extern int recurse;
  34 extern int fuzzy_basis;
  35 extern int read_batch;
  36 extern int max_delete;
  37 extern int delay_updates;
  38 extern int checksum_seed;
  39 extern int basis_dir_cnt;
  40 extern int prune_empty_dirs;
  41 extern int protocol_version;
  42 extern int preserve_uid;
  43 extern int preserve_gid;
  44 extern int preserve_hard_links;
  45 extern int need_messages_from_generator;
  46 extern int delete_mode, delete_before, delete_during, delete_after;
  47 extern int delete_excluded;
  48 extern int make_backups;
  49 extern char *backup_dir, *backup_suffix;
  50 extern char *partial_dir;
  51 extern char *dest_option;
  52 extern struct filter_list_struct filter_list;
  53
  54 void setup_protocol(int f_out,int f_in)
  55 {
  56         if (am_sender)
  57                 file_extra_cnt += PTR_EXTRA_LEN;
  58         else
  59                 file_extra_cnt++;
  60         if (preserve_uid)
  61                 preserve_uid = ++file_extra_cnt;
  62         if (preserve_gid)
  63                 preserve_gid = ++file_extra_cnt;
  64
  65         if (remote_protocol == 0) {
  66                 if (!read_batch)
  67                         write_int(f_out, protocol_version);
  68                 remote_protocol = read_int(f_in);
  69                 if (protocol_version > remote_protocol)
  70                         protocol_version = remote_protocol;
  71         }
  72         if (read_batch && remote_protocol > protocol_version) {
  73                 rprintf(FERROR, "The protocol version in the batch file is too new (%d > %d).\n",
  74                         remote_protocol, protocol_version);
  75                 exit_cleanup(RERR_PROTOCOL);
  76         }
  77
  78         if (verbose > 3) {
  79                 rprintf(FINFO, "(%s) Protocol versions: remote=%d, negotiated=%d\n",
  80                         am_server? "Server" : "Client", remote_protocol, protocol_version);
  81         }
  82         if (remote_protocol < MIN_PROTOCOL_VERSION
  83          || remote_protocol > MAX_PROTOCOL_VERSION) {
  84                 rprintf(FERROR,"protocol version mismatch -- is your shell clean?\n");
  85                 rprintf(FERROR,"(see the rsync man page for an explanation)\n");
  86                 exit_cleanup(RERR_PROTOCOL);
  87         }
  88         if (remote_protocol < OLD_PROTOCOL_VERSION) {
  89                 rprintf(FINFO,"%s is very old version of rsync, upgrade recommended.\n",
  90                         am_server? "Client" : "Server");
  91         }
  92         if (protocol_version < MIN_PROTOCOL_VERSION) {
  93                 rprintf(FERROR, "--protocol must be at least %d on the %s.\n",
  94                         MIN_PROTOCOL_VERSION, am_server? "Server" : "Client");
  95                 exit_cleanup(RERR_PROTOCOL);
  96         }
  97         if (protocol_version > PROTOCOL_VERSION) {
  98                 rprintf(FERROR, "--protocol must be no more than %d on the %s.\n",
  99                         PROTOCOL_VERSION, am_server? "Server" : "Client");
 100                 exit_cleanup(RERR_PROTOCOL);
 101         }
 102
 103         if (protocol_version < 30) {
 104                 if (max_delete == 0 && am_sender) {
 105                         rprintf(FERROR,
 106                             "--max-delete=0 requires protocol 30 or higher"
 107                             " (negotiated %d).\n",
 108                             protocol_version);
 109                         exit_cleanup(RERR_PROTOCOL);
 110                 }
 111         }
 112
 113         if (delete_mode && !(delete_before+delete_during+delete_after)) {
 114                 if (protocol_version < 30)
 115                         delete_before = 1;
 116                 else
 117                         delete_during = 1;
 118         }
 119
 120         if (protocol_version < 29) {
 121                 if (fuzzy_basis) {
 122                         rprintf(FERROR,
 123                             "--fuzzy requires protocol 29 or higher"
 124                             " (negotiated %d).\n",
 125                             protocol_version);
 126                         exit_cleanup(RERR_PROTOCOL);
 127                 }
 128
 129                 if (basis_dir_cnt && inplace) {
 130                         rprintf(FERROR,
 131                             "%s with --inplace requires protocol 29 or higher"
 132                             " (negotiated %d).\n",
 133                             dest_option, protocol_version);
 134                         exit_cleanup(RERR_PROTOCOL);
 135                 }
 136
 137                 if (basis_dir_cnt > 1) {
 138                         rprintf(FERROR,
 139                             "Using more than one %s option requires protocol"
 140                             " 29 or higher (negotiated %d).\n",
 141                             dest_option, protocol_version);
 142                         exit_cleanup(RERR_PROTOCOL);
 143                 }
 144
 145                 if (prune_empty_dirs) {
 146                         rprintf(FERROR,
 147                             "--prune-empty-dirs requires protocol 29 or higher"
 148                             " (negotiated %d).\n",
 149                             protocol_version);
 150                         exit_cleanup(RERR_PROTOCOL);
 151                 }
 152         } else if (protocol_version >= 30) {
 153                 if (recurse && !preserve_hard_links && !delete_before
 154                  && !delete_after && !delay_updates && !prune_empty_dirs)
 155                         inc_recurse = 1;
 156                 need_messages_from_generator = 1;
 157         }
 158
 159         if (make_backups && !backup_dir && delete_mode && !delete_excluded
 160          && (!am_server || local_server)) {
 161                 char *rule;
 162                 if (asprintf(&rule, "P%s *%s",
 163                             !am_sender || protocol_version >= 30 ? "p" : "",
 164                             backup_suffix) < 0)
 165                         out_of_memory("setup_protocol");
 166                 parse_rule(&filter_list, rule, 0, 0);
 167                 free(rule);
 168         }
 169         if (partial_dir && *partial_dir != '/' && (!am_server || local_server)) {
 170                 int flags = MATCHFLG_NO_PREFIXES | MATCHFLG_DIRECTORY;
 171                 if (!am_sender || protocol_version >= 30)
 172                         flags |= MATCHFLG_PERISHABLE;
 173                 parse_rule(&filter_list, partial_dir, flags, 0);
 174         }
 175
 176         if (am_server) {
 177                 if (!checksum_seed)
 178                         checksum_seed = time(NULL);
 179                 write_int(f_out, checksum_seed);
 180         } else {
 181                 checksum_seed = read_int(f_in);
 182         }
 183 }