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) 2004-2008 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;
  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 int receiver_symlink_times = 0; /* receiver can set the time on a symlink */
  66
  67 #ifdef ICONV_OPTION
  68 int filesfrom_convert = 0;
  69 #endif
  70
  71 #define CF_INC_RECURSE   (1<<0)
  72 #define CF_SYMLINK_TIMES (1<<1)
  73
  74 static const char *client_info;
  75
  76 /* The server makes sure that if either side only supports a pre-release
  77  * version of a protocol, that both sides must speak a compatible version
  78  * of that protocol for it to be advertised as available. */
  79 static void check_sub_protocol(void)
  80 {
  81         char *dot;
  82         int their_protocol, their_sub;
  83 #if SUBPROTOCOL_VERSION != 0
  84         int our_sub = protocol_version < PROTOCOL_VERSION ? 0 : SUBPROTOCOL_VERSION;
  85 #else
  86         int our_sub = 0;
  87 #endif
  88
  89         /* client_info starts with VER.SUB string if client is a pre-release. */
  90         if (!(their_protocol = atoi(client_info))
  91          || !(dot = strchr(client_info, '.'))
  92          || !(their_sub = atoi(dot+1))) {
  93 #if SUBPROTOCOL_VERSION != 0
  94                 if (our_sub)
  95                         protocol_version--;
  96 #endif
  97                 return;
  98         }
  99
 100         if (their_protocol < protocol_version) {
 101                 if (their_sub)
 102                         protocol_version = their_protocol - 1;
 103                 return;
 104         }
 105
 106         if (their_protocol > protocol_version)
 107                 their_sub = 0; /* 0 == final version of older protocol */
 108         if (their_sub != our_sub)
 109                 protocol_version--;
 110 }
 111
 112 void set_allow_inc_recurse(void)
 113 {
 114         client_info = shell_cmd ? shell_cmd : "";
 115
 116         if (!recurse || use_qsort)
 117                 allow_inc_recurse = 0;
 118         else if (!am_sender
 119          && (delete_before || delete_after
 120           || delay_updates || prune_empty_dirs))
 121                 allow_inc_recurse = 0;
 122         else if (am_server && !local_server
 123          && (strchr(client_info, 'i') == NULL))
 124                 allow_inc_recurse = 0;
 125 }
 126
 127 void setup_protocol(int f_out,int f_in)
 128 {
 129         if (am_sender)
 130                 file_extra_cnt += PTR_EXTRA_CNT;
 131         else
 132                 file_extra_cnt++;
 133         if (preserve_uid)
 134                 uid_ndx = ++file_extra_cnt;
 135         if (preserve_gid)
 136                 gid_ndx = ++file_extra_cnt;
 137         if (preserve_acls && !am_sender)
 138                 acls_ndx = ++file_extra_cnt;
 139         if (preserve_xattrs)
 140                 xattrs_ndx = ++file_extra_cnt;
 141
 142         if (am_server)
 143                 set_allow_inc_recurse();
 144
 145         if (remote_protocol == 0) {
 146                 if (am_server && !local_server)
 147                         check_sub_protocol();
 148                 if (!read_batch)
 149                         write_int(f_out, protocol_version);
 150                 remote_protocol = read_int(f_in);
 151                 if (protocol_version > remote_protocol)
 152                         protocol_version = remote_protocol;
 153         }
 154         if (read_batch && remote_protocol > protocol_version) {
 155                 rprintf(FERROR, "The protocol version in the batch file is too new (%d > %d).\n",
 156                         remote_protocol, protocol_version);
 157                 exit_cleanup(RERR_PROTOCOL);
 158         }
 159
 160         if (verbose > 3) {
 161                 rprintf(FINFO, "(%s) Protocol versions: remote=%d, negotiated=%d\n",
 162                         am_server? "Server" : "Client", remote_protocol, protocol_version);
 163         }
 164         if (remote_protocol < MIN_PROTOCOL_VERSION
 165          || remote_protocol > MAX_PROTOCOL_VERSION) {
 166                 rprintf(FERROR,"protocol version mismatch -- is your shell clean?\n");
 167                 rprintf(FERROR,"(see the rsync man page for an explanation)\n");
 168                 exit_cleanup(RERR_PROTOCOL);
 169         }
 170         if (remote_protocol < OLD_PROTOCOL_VERSION) {
 171                 rprintf(FINFO,"%s is very old version of rsync, upgrade recommended.\n",
 172                         am_server? "Client" : "Server");
 173         }
 174         if (protocol_version < MIN_PROTOCOL_VERSION) {
 175                 rprintf(FERROR, "--protocol must be at least %d on the %s.\n",
 176                         MIN_PROTOCOL_VERSION, am_server? "Server" : "Client");
 177                 exit_cleanup(RERR_PROTOCOL);
 178         }
 179         if (protocol_version > PROTOCOL_VERSION) {
 180                 rprintf(FERROR, "--protocol must be no more than %d on the %s.\n",
 181                         PROTOCOL_VERSION, am_server? "Server" : "Client");
 182                 exit_cleanup(RERR_PROTOCOL);
 183         }
 184         if (read_batch)
 185                 check_batch_flags();
 186
 187         if (protocol_version < 30) {
 188                 if (append_mode == 1)
 189                         append_mode = 2;
 190                 if (preserve_acls && !local_server) {
 191                         rprintf(FERROR,
 192                             "--acls requires protocol 30 or higher"
 193                             " (negotiated %d).\n",
 194                             protocol_version);
 195                         exit_cleanup(RERR_PROTOCOL);
 196                 }
 197                 if (preserve_xattrs && !local_server) {
 198                         rprintf(FERROR,
 199                             "--xattrs requires protocol 30 or higher"
 200                             " (negotiated %d).\n",
 201                             protocol_version);
 202                         exit_cleanup(RERR_PROTOCOL);
 203                 }
 204         }
 205
 206         if (delete_mode && !(delete_before+delete_during+delete_after)) {
 207                 if (protocol_version < 30)
 208                         delete_before = 1;
 209                 else
 210                         delete_during = 1;
 211         }
 212
 213         if (protocol_version < 29) {
 214                 if (fuzzy_basis) {
 215                         rprintf(FERROR,
 216                             "--fuzzy requires protocol 29 or higher"
 217                             " (negotiated %d).\n",
 218                             protocol_version);
 219                         exit_cleanup(RERR_PROTOCOL);
 220                 }
 221
 222                 if (basis_dir_cnt && inplace) {
 223                         rprintf(FERROR,
 224                             "%s with --inplace requires protocol 29 or higher"
 225                             " (negotiated %d).\n",
 226                             dest_option, protocol_version);
 227                         exit_cleanup(RERR_PROTOCOL);
 228                 }
 229
 230                 if (basis_dir_cnt > 1) {
 231                         rprintf(FERROR,
 232                             "Using more than one %s option requires protocol"
 233                             " 29 or higher (negotiated %d).\n",
 234                             dest_option, protocol_version);
 235                         exit_cleanup(RERR_PROTOCOL);
 236                 }
 237
 238                 if (prune_empty_dirs) {
 239                         rprintf(FERROR,
 240                             "--prune-empty-dirs requires protocol 29 or higher"
 241                             " (negotiated %d).\n",
 242                             protocol_version);
 243                         exit_cleanup(RERR_PROTOCOL);
 244                 }
 245         } else if (protocol_version >= 30) {
 246                 int compat_flags;
 247                 if (am_server) {
 248                         compat_flags = allow_inc_recurse ? CF_INC_RECURSE : 0;
 249 #if defined HAVE_LUTIMES && defined HAVE_UTIMES
 250                         compat_flags |= CF_SYMLINK_TIMES;
 251 #endif
 252                         write_byte(f_out, compat_flags);
 253                 } else
 254                         compat_flags = read_byte(f_in);
 255                 /* The inc_recurse var MUST be set to 0 or 1. */
 256                 inc_recurse = compat_flags & CF_INC_RECURSE ? 1 : 0;
 257                 if (am_sender) {
 258                         receiver_symlink_times = am_server
 259                             ? strchr(client_info, 'L') != NULL
 260                             : !!(compat_flags & CF_SYMLINK_TIMES);
 261                 }
 262 #if defined HAVE_LUTIMES && defined HAVE_UTIMES
 263                 else
 264                         receiver_symlink_times = 1;
 265 #endif
 266                 if (inc_recurse && !allow_inc_recurse) {
 267                         /* This should only be able to happen in a batch. */
 268                         fprintf(stderr,
 269                             "Incompatible options specified for inc-recursive %s.\n",
 270                             read_batch ? "batch file" : "connection");
 271                         exit_cleanup(RERR_SYNTAX);
 272                 }
 273                 need_messages_from_generator = 1;
 274 #if defined HAVE_LUTIMES && defined HAVE_UTIMES
 275         } else if (!am_sender) {
 276                 receiver_symlink_times = 1;
 277 #endif
 278         }
 279
 280         if (need_unsorted_flist && (!am_sender || inc_recurse))
 281                 unsort_ndx = ++file_extra_cnt;
 282
 283         if (partial_dir && *partial_dir != '/' && (!am_server || local_server)) {
 284                 int flags = MATCHFLG_NO_PREFIXES | MATCHFLG_DIRECTORY;
 285                 if (!am_sender || protocol_version >= 30)
 286                         flags |= MATCHFLG_PERISHABLE;
 287                 parse_rule(&filter_list, partial_dir, flags, 0);
 288         }
 289
 290
 291 #ifdef ICONV_OPTION
 292         if (protect_args && files_from) {
 293                 if (am_sender)
 294                         filesfrom_convert = filesfrom_host && ic_send != (iconv_t)-1;
 295                 else
 296                         filesfrom_convert = !filesfrom_host && ic_recv != (iconv_t)-1;
 297         }
 298 #endif
 299
 300         if (am_server) {
 301                 if (!checksum_seed)
 302                         checksum_seed = time(NULL);
 303                 write_int(f_out, checksum_seed);
 304         } else {
 305                 checksum_seed = read_int(f_in);
 306         }
 307 }