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 as published by
  10  * the Free Software Foundation; either version 3 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License along
  19  * with this program; if not, visit the http://fsf.org website.
  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 use_qsort;
  35 extern int allow_inc_recurse;
  36 extern int append_mode;
  37 extern int fuzzy_basis;
  38 extern int read_batch;
  39 extern int delay_updates;
  40 extern int checksum_seed;
  41 extern int basis_dir_cnt;
  42 extern int prune_empty_dirs;
  43 extern int protocol_version;
  44 extern int protect_args;
  45 extern int preserve_uid;
  46 extern int preserve_gid;
  47 extern int preserve_acls;
  48 extern int preserve_xattrs;
  49 extern int need_messages_from_generator;
  50 extern int delete_mode, delete_before, delete_during, delete_after;
  51 extern char *shell_cmd; /* contains VER.SUB string if client is a pre-release */
  52 extern char *partial_dir;
  53 extern char *dest_option;
  54 extern char *files_from;
  55 extern char *filesfrom_host;
  56 extern struct filter_list_struct filter_list;
  57 extern int need_unsorted_flist;
  58 #ifdef ICONV_OPTION
  59 extern iconv_t ic_send, ic_recv;
  60 #endif
  61
  62 /* These index values are for the file-list's extra-attribute array. */
  63 int uid_ndx, gid_ndx, acls_ndx, xattrs_ndx, unsort_ndx;
  64
  65 #ifdef ICONV_OPTION
  66 int filesfrom_convert = 0;
  67 #endif
  68
  69 /* The server makes sure that if either side only supports a pre-release
  70  * version of a protocol, that both sides must speak a compatible version
  71  * of that protocol for it to be advertised as available. */
  72 static void check_sub_protocol(void)
  73 {
  74         char *dot;
  75         int their_protocol, their_sub;
  76 #if SUBPROTOCOL_VERSION != 0
  77         int our_sub = protocol_version < PROTOCOL_VERSION ? 0 : SUBPROTOCOL_VERSION;
  78 #else
  79         int our_sub = 0;
  80 #endif
  81
  82         if (!shell_cmd || !(dot = strchr(shell_cmd, '.'))
  83          || !(their_protocol = atoi(shell_cmd))
  84          || !(their_sub = atoi(dot+1))) {
  85 #if SUBPROTOCOL_VERSION != 0
  86                 if (our_sub)
  87                         protocol_version--;
  88 #endif
  89                 return;
  90         }
  91
  92         if (their_protocol < protocol_version) {
  93                 if (their_sub)
  94                         protocol_version = their_protocol - 1;
  95                 return;
  96         }
  97
  98         if (their_protocol > protocol_version)
  99                 their_sub = 0; /* 0 == final version of older protocol */
 100         if (their_sub != our_sub)
 101                 protocol_version--;
 102 }
 103
 104 void set_allow_inc_recurse(void)
 105 {
 106         if (!recurse || use_qsort)
 107                 allow_inc_recurse = 0;
 108         else if (!am_sender
 109          && (delete_before || delete_after
 110           || delay_updates || prune_empty_dirs))
 111                 allow_inc_recurse = 0;
 112         else if (am_server && !local_server
 113          && (!shell_cmd || strchr(shell_cmd, 'i') == NULL))
 114                 allow_inc_recurse = 0;
 115 }
 116
 117 void setup_protocol(int f_out,int f_in)
 118 {
 119         if (am_sender)
 120                 file_extra_cnt += PTR_EXTRA_CNT;
 121         else
 122                 file_extra_cnt++;
 123         if (preserve_uid)
 124                 uid_ndx = ++file_extra_cnt;
 125         if (preserve_gid)
 126                 gid_ndx = ++file_extra_cnt;
 127         if (preserve_acls && !am_sender)
 128                 acls_ndx = ++file_extra_cnt;
 129         if (preserve_xattrs)
 130                 xattrs_ndx = ++file_extra_cnt;
 131
 132         if (am_server)
 133                 set_allow_inc_recurse();
 134
 135         if (remote_protocol == 0) {
 136                 if (am_server && !local_server)
 137                         check_sub_protocol();
 138                 if (!read_batch)
 139                         write_int(f_out, protocol_version);
 140                 remote_protocol = read_int(f_in);
 141                 if (protocol_version > remote_protocol)
 142                         protocol_version = remote_protocol;
 143         }
 144         if (read_batch && remote_protocol > protocol_version) {
 145                 rprintf(FERROR, "The protocol version in the batch file is too new (%d > %d).\n",
 146                         remote_protocol, protocol_version);
 147                 exit_cleanup(RERR_PROTOCOL);
 148         }
 149
 150         if (verbose > 3) {
 151                 rprintf(FINFO, "(%s) Protocol versions: remote=%d, negotiated=%d\n",
 152                         am_server? "Server" : "Client", remote_protocol, protocol_version);
 153         }
 154         if (remote_protocol < MIN_PROTOCOL_VERSION
 155          || remote_protocol > MAX_PROTOCOL_VERSION) {
 156                 rprintf(FERROR,"protocol version mismatch -- is your shell clean?\n");
 157                 rprintf(FERROR,"(see the rsync man page for an explanation)\n");
 158                 exit_cleanup(RERR_PROTOCOL);
 159         }
 160         if (remote_protocol < OLD_PROTOCOL_VERSION) {
 161                 rprintf(FINFO,"%s is very old version of rsync, upgrade recommended.\n",
 162                         am_server? "Client" : "Server");
 163         }
 164         if (protocol_version < MIN_PROTOCOL_VERSION) {
 165                 rprintf(FERROR, "--protocol must be at least %d on the %s.\n",
 166                         MIN_PROTOCOL_VERSION, am_server? "Server" : "Client");
 167                 exit_cleanup(RERR_PROTOCOL);
 168         }
 169         if (protocol_version > PROTOCOL_VERSION) {
 170                 rprintf(FERROR, "--protocol must be no more than %d on the %s.\n",
 171                         PROTOCOL_VERSION, am_server? "Server" : "Client");
 172                 exit_cleanup(RERR_PROTOCOL);
 173         }
 174
 175         if (protocol_version < 30) {
 176                 if (append_mode == 1)
 177                         append_mode = 2;
 178                 if (preserve_acls && !local_server) {
 179                         rprintf(FERROR,
 180                             "--acls requires protocol 30 or higher"
 181                             " (negotiated %d).\n",
 182                             protocol_version);
 183                         exit_cleanup(RERR_PROTOCOL);
 184                 }
 185                 if (preserve_xattrs && !local_server) {
 186                         rprintf(FERROR,
 187                             "--xattrs requires protocol 30 or higher"
 188                             " (negotiated %d).\n",
 189                             protocol_version);
 190                         exit_cleanup(RERR_PROTOCOL);
 191                 }
 192         }
 193
 194         if (delete_mode && !(delete_before+delete_during+delete_after)) {
 195                 if (protocol_version < 30)
 196                         delete_before = 1;
 197                 else
 198                         delete_during = 1;
 199         }
 200
 201         if (protocol_version < 29) {
 202                 if (fuzzy_basis) {
 203                         rprintf(FERROR,
 204                             "--fuzzy requires protocol 29 or higher"
 205                             " (negotiated %d).\n",
 206                             protocol_version);
 207                         exit_cleanup(RERR_PROTOCOL);
 208                 }
 209
 210                 if (basis_dir_cnt && inplace) {
 211                         rprintf(FERROR,
 212                             "%s with --inplace requires protocol 29 or higher"
 213                             " (negotiated %d).\n",
 214                             dest_option, protocol_version);
 215                         exit_cleanup(RERR_PROTOCOL);
 216                 }
 217
 218                 if (basis_dir_cnt > 1) {
 219                         rprintf(FERROR,
 220                             "Using more than one %s option requires protocol"
 221                             " 29 or higher (negotiated %d).\n",
 222                             dest_option, protocol_version);
 223                         exit_cleanup(RERR_PROTOCOL);
 224                 }
 225
 226                 if (prune_empty_dirs) {
 227                         rprintf(FERROR,
 228                             "--prune-empty-dirs requires protocol 29 or higher"
 229                             " (negotiated %d).\n",
 230                             protocol_version);
 231                         exit_cleanup(RERR_PROTOCOL);
 232                 }
 233         } else if (protocol_version >= 30) {
 234                 if (am_server) {
 235                         inc_recurse = allow_inc_recurse;
 236                         write_byte(f_out, inc_recurse);
 237                 } else
 238                         inc_recurse = read_byte(f_in);
 239                 if (inc_recurse && !allow_inc_recurse) {
 240                         /* This should only be able to happen in a batch. */
 241                         fprintf(stderr,
 242                             "Incompatible options specified for inc-recursive %s.\n",
 243                             read_batch ? "batch file" : "connection");
 244                         exit_cleanup(RERR_SYNTAX);
 245                 }
 246                 need_messages_from_generator = 1;
 247         }
 248
 249         if (need_unsorted_flist && (!am_sender || inc_recurse))
 250                 unsort_ndx = ++file_extra_cnt;
 251
 252         if (partial_dir && *partial_dir != '/' && (!am_server || local_server)) {
 253                 int flags = MATCHFLG_NO_PREFIXES | MATCHFLG_DIRECTORY;
 254                 if (!am_sender || protocol_version >= 30)
 255                         flags |= MATCHFLG_PERISHABLE;
 256                 parse_rule(&filter_list, partial_dir, flags, 0);
 257         }
 258
 259
 260 #ifdef ICONV_OPTION
 261         if (protect_args && files_from) {
 262                 if (am_sender)
 263                         filesfrom_convert = filesfrom_host && ic_send != (iconv_t)-1;
 264                 else
 265                         filesfrom_convert = !filesfrom_host && ic_recv != (iconv_t)-1;
 266         }
 267 #endif
 268
 269         if (am_server) {
 270                 if (!checksum_seed)
 271                         checksum_seed = time(NULL);
 272                 write_int(f_out, checksum_seed);
 273         } else {
 274                 checksum_seed = read_int(f_in);
 275         }
 276 }