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 am_server;
  29 extern int am_sender;
  30 extern int local_server;
  31 extern int inplace;
  32 extern int recurse;
  33 extern int use_qsort;
  34 extern int allow_inc_recurse;
  35 extern int append_mode;
  36 extern int fuzzy_basis;
  37 extern int read_batch;
  38 extern int delay_updates;
  39 extern int checksum_seed;
  40 extern int basis_dir_cnt;
  41 extern int prune_empty_dirs;
  42 extern int protocol_version;
  43 extern int protect_args;
  44 extern int preserve_uid;
  45 extern int preserve_gid;
  46 extern int preserve_acls;
  47 extern int preserve_xattrs;
  48 extern int need_messages_from_generator;
  49 extern int delete_mode, delete_before, delete_during, delete_after;
  50 extern char *shell_cmd;
  51 extern char *partial_dir;
  52 extern char *dest_option;
  53 extern char *files_from;
  54 extern char *filesfrom_host;
  55 extern struct filter_list_struct filter_list;
  56 extern int need_unsorted_flist;
  57 #ifdef ICONV_OPTION
  58 extern iconv_t ic_send, ic_recv;
  59 #endif
  60
  61 /* These index values are for the file-list's extra-attribute array. */
  62 int uid_ndx, gid_ndx, acls_ndx, xattrs_ndx, unsort_ndx;
  63
  64 int receiver_symlink_times = 0; /* receiver can set the time on a symlink */
  65
  66 #ifdef ICONV_OPTION
  67 int filesfrom_convert = 0;
  68 #endif
  69
  70 #define CF_INC_RECURSE   (1<<0)
  71 #define CF_SYMLINK_TIMES (1<<1)
  72
  73 static const char *client_info;
  74
  75 /* The server makes sure that if either side only supports a pre-release
  76  * version of a protocol, that both sides must speak a compatible version
  77  * of that protocol for it to be advertised as available. */
  78 static void check_sub_protocol(void)
  79 {
  80         char *dot;
  81         int their_protocol, their_sub;
  82 #if SUBPROTOCOL_VERSION != 0
  83         int our_sub = protocol_version < PROTOCOL_VERSION ? 0 : SUBPROTOCOL_VERSION;
  84 #else
  85         int our_sub = 0;
  86 #endif
  87
  88         /* client_info starts with VER.SUB string if client is a pre-release. */
  89         if (!(their_protocol = atoi(client_info))
  90          || !(dot = strchr(client_info, '.'))
  91          || !(their_sub = atoi(dot+1))) {
  92 #if SUBPROTOCOL_VERSION != 0
  93                 if (our_sub)
  94                         protocol_version--;
  95 #endif
  96                 return;
  97         }
  98
  99         if (their_protocol < protocol_version) {
 100                 if (their_sub)
 101                         protocol_version = their_protocol - 1;
 102                 return;
 103         }
 104
 105         if (their_protocol > protocol_version)
 106                 their_sub = 0; /* 0 == final version of older protocol */
 107         if (their_sub != our_sub)
 108                 protocol_version--;
 109 }
 110
 111 void set_allow_inc_recurse(void)
 112 {
 113         client_info = shell_cmd ? shell_cmd : "";
 114
 115         if (!recurse || use_qsort)
 116                 allow_inc_recurse = 0;
 117         else if (!am_sender
 118          && (delete_before || delete_after
 119           || delay_updates || prune_empty_dirs))
 120                 allow_inc_recurse = 0;
 121         else if (am_server && !local_server
 122          && (strchr(client_info, 'i') == NULL))
 123                 allow_inc_recurse = 0;
 124 }
 125
 126 void setup_protocol(int f_out,int f_in)
 127 {
 128         if (am_sender)
 129                 file_extra_cnt += PTR_EXTRA_CNT;
 130         else
 131                 file_extra_cnt++;
 132         if (preserve_uid)
 133                 uid_ndx = ++file_extra_cnt;
 134         if (preserve_gid)
 135                 gid_ndx = ++file_extra_cnt;
 136         if (preserve_acls && !am_sender)
 137                 acls_ndx = ++file_extra_cnt;
 138         if (preserve_xattrs)
 139                 xattrs_ndx = ++file_extra_cnt;
 140
 141         if (am_server)
 142                 set_allow_inc_recurse();
 143
 144         if (remote_protocol == 0) {
 145                 if (am_server && !local_server)
 146                         check_sub_protocol();
 147                 if (!read_batch)
 148                         write_int(f_out, protocol_version);
 149                 remote_protocol = read_int(f_in);
 150                 if (protocol_version > remote_protocol)
 151                         protocol_version = remote_protocol;
 152         }
 153         if (read_batch && remote_protocol > protocol_version) {
 154                 rprintf(FERROR, "The protocol version in the batch file is too new (%d > %d).\n",
 155                         remote_protocol, protocol_version);
 156                 exit_cleanup(RERR_PROTOCOL);
 157         }
 158
 159         if (DEBUG_GTE(PROTO, 1)) {
 160                 rprintf(FINFO, "(%s) Protocol versions: remote=%d, negotiated=%d\n",
 161                         am_server? "Server" : "Client", remote_protocol, protocol_version);
 162         }
 163         if (remote_protocol < MIN_PROTOCOL_VERSION
 164          || remote_protocol > MAX_PROTOCOL_VERSION) {
 165                 rprintf(FERROR,"protocol version mismatch -- is your shell clean?\n");
 166                 rprintf(FERROR,"(see the rsync man page for an explanation)\n");
 167                 exit_cleanup(RERR_PROTOCOL);
 168         }
 169         if (remote_protocol < OLD_PROTOCOL_VERSION) {
 170                 rprintf(FINFO,"%s is very old version of rsync, upgrade recommended.\n",
 171                         am_server? "Client" : "Server");
 172         }
 173         if (protocol_version < MIN_PROTOCOL_VERSION) {
 174                 rprintf(FERROR, "--protocol must be at least %d on the %s.\n",
 175                         MIN_PROTOCOL_VERSION, am_server? "Server" : "Client");
 176                 exit_cleanup(RERR_PROTOCOL);
 177         }
 178         if (protocol_version > PROTOCOL_VERSION) {
 179                 rprintf(FERROR, "--protocol must be no more than %d on the %s.\n",
 180                         PROTOCOL_VERSION, am_server? "Server" : "Client");
 181                 exit_cleanup(RERR_PROTOCOL);
 182         }
 183         if (read_batch)
 184                 check_batch_flags();
 185
 186         if (protocol_version < 30) {
 187                 if (append_mode == 1)
 188                         append_mode = 2;
 189                 if (preserve_acls && !local_server) {
 190                         rprintf(FERROR,
 191                             "--acls requires protocol 30 or higher"
 192                             " (negotiated %d).\n",
 193                             protocol_version);
 194                         exit_cleanup(RERR_PROTOCOL);
 195                 }
 196                 if (preserve_xattrs && !local_server) {
 197                         rprintf(FERROR,
 198                             "--xattrs requires protocol 30 or higher"
 199                             " (negotiated %d).\n",
 200                             protocol_version);
 201                         exit_cleanup(RERR_PROTOCOL);
 202                 }
 203         }
 204
 205         if (delete_mode && !(delete_before+delete_during+delete_after)) {
 206                 if (protocol_version < 30)
 207                         delete_before = 1;
 208                 else
 209                         delete_during = 1;
 210         }
 211
 212         if (protocol_version < 29) {
 213                 if (fuzzy_basis) {
 214                         rprintf(FERROR,
 215                             "--fuzzy requires protocol 29 or higher"
 216                             " (negotiated %d).\n",
 217                             protocol_version);
 218                         exit_cleanup(RERR_PROTOCOL);
 219                 }
 220
 221                 if (basis_dir_cnt && inplace) {
 222                         rprintf(FERROR,
 223                             "%s with --inplace requires protocol 29 or higher"
 224                             " (negotiated %d).\n",
 225                             dest_option, protocol_version);
 226                         exit_cleanup(RERR_PROTOCOL);
 227                 }
 228
 229                 if (basis_dir_cnt > 1) {
 230                         rprintf(FERROR,
 231                             "Using more than one %s option requires protocol"
 232                             " 29 or higher (negotiated %d).\n",
 233                             dest_option, protocol_version);
 234                         exit_cleanup(RERR_PROTOCOL);
 235                 }
 236
 237                 if (prune_empty_dirs) {
 238                         rprintf(FERROR,
 239                             "--prune-empty-dirs requires protocol 29 or higher"
 240                             " (negotiated %d).\n",
 241                             protocol_version);
 242                         exit_cleanup(RERR_PROTOCOL);
 243                 }
 244         } else if (protocol_version >= 30) {
 245                 int compat_flags;
 246                 if (am_server) {
 247                         compat_flags = allow_inc_recurse ? CF_INC_RECURSE : 0;
 248 #if defined HAVE_LUTIMES && defined HAVE_UTIMES
 249                         compat_flags |= CF_SYMLINK_TIMES;
 250 #endif
 251                         write_byte(f_out, compat_flags);
 252                 } else
 253                         compat_flags = read_byte(f_in);
 254                 /* The inc_recurse var MUST be set to 0 or 1. */
 255                 inc_recurse = compat_flags & CF_INC_RECURSE ? 1 : 0;
 256                 if (am_sender) {
 257                         receiver_symlink_times = am_server
 258                             ? strchr(client_info, 'L') != NULL
 259                             : !!(compat_flags & CF_SYMLINK_TIMES);
 260                 }
 261 #if defined HAVE_LUTIMES && defined HAVE_UTIMES
 262                 else
 263                         receiver_symlink_times = 1;
 264 #endif
 265                 if (inc_recurse && !allow_inc_recurse) {
 266                         /* This should only be able to happen in a batch. */
 267                         fprintf(stderr,
 268                             "Incompatible options specified for inc-recursive %s.\n",
 269                             read_batch ? "batch file" : "connection");
 270                         exit_cleanup(RERR_SYNTAX);
 271                 }
 272                 need_messages_from_generator = 1;
 273 #if defined HAVE_LUTIMES && defined HAVE_UTIMES
 274         } else if (!am_sender) {
 275                 receiver_symlink_times = 1;
 276 #endif
 277         }
 278
 279         if (need_unsorted_flist && (!am_sender || inc_recurse))
 280                 unsort_ndx = ++file_extra_cnt;
 281
 282         if (partial_dir && *partial_dir != '/' && (!am_server || local_server)) {
 283                 int flags = MATCHFLG_NO_PREFIXES | MATCHFLG_DIRECTORY;
 284                 if (!am_sender || protocol_version >= 30)
 285                         flags |= MATCHFLG_PERISHABLE;
 286                 parse_rule(&filter_list, partial_dir, flags, 0);
 287         }
 288
 289
 290 #ifdef ICONV_OPTION
 291         if (protect_args && files_from) {
 292                 if (am_sender)
 293                         filesfrom_convert = filesfrom_host && ic_send != (iconv_t)-1;
 294                 else
 295                         filesfrom_convert = !filesfrom_host && ic_recv != (iconv_t)-1;
 296         }
 297 #endif
 298
 299         if (am_server) {
 300                 if (!checksum_seed)
 301                         checksum_seed = time(NULL);
 302                 write_int(f_out, checksum_seed);
 303         } else {
 304                 checksum_seed = read_int(f_in);
 305         }
 306 }