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) 2004-2009 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 extern char *iconv_opt;
  61 #endif
  62
  63 /* These index values are for the file-list's extra-attribute array. */
  64 int uid_ndx, gid_ndx, acls_ndx, xattrs_ndx, unsort_ndx;
  65
  66 int receiver_symlink_times = 0; /* receiver can set the time on a symlink */
  67 int sender_symlink_iconv = 0;   /* sender should convert symlink content */
  68
  69 #ifdef ICONV_OPTION
  70 int filesfrom_convert = 0;
  71 #endif
  72
  73 #define CF_INC_RECURSE   (1<<0)
  74 #define CF_SYMLINK_TIMES (1<<1)
  75 #define CF_SYMLINK_ICONV (1<<2)
  76
  77 static const char *client_info;
  78
  79 /* The server makes sure that if either side only supports a pre-release
  80  * version of a protocol, that both sides must speak a compatible version
  81  * of that protocol for it to be advertised as available. */
  82 static void check_sub_protocol(void)
  83 {
  84         char *dot;
  85         int their_protocol, their_sub;
  86 #if SUBPROTOCOL_VERSION != 0
  87         int our_sub = protocol_version < PROTOCOL_VERSION ? 0 : SUBPROTOCOL_VERSION;
  88 #else
  89         int our_sub = 0;
  90 #endif
  91
  92         /* client_info starts with VER.SUB string if client is a pre-release. */
  93         if (!(their_protocol = atoi(client_info))
  94          || !(dot = strchr(client_info, '.'))
  95          || !(their_sub = atoi(dot+1))) {
  96 #if SUBPROTOCOL_VERSION != 0
  97                 if (our_sub)
  98                         protocol_version--;
  99 #endif
 100                 return;
 101         }
 102
 103         if (their_protocol < protocol_version) {
 104                 if (their_sub)
 105                         protocol_version = their_protocol - 1;
 106                 return;
 107         }
 108
 109         if (their_protocol > protocol_version)
 110                 their_sub = 0; /* 0 == final version of older protocol */
 111         if (their_sub != our_sub)
 112                 protocol_version--;
 113 }
 114
 115 void set_allow_inc_recurse(void)
 116 {
 117         client_info = shell_cmd ? shell_cmd : "";
 118
 119         if (!recurse || use_qsort)
 120                 allow_inc_recurse = 0;
 121         else if (!am_sender
 122          && (delete_before || delete_after
 123           || delay_updates || prune_empty_dirs))
 124                 allow_inc_recurse = 0;
 125         else if (am_server && !local_server
 126          && (strchr(client_info, 'i') == NULL))
 127                 allow_inc_recurse = 0;
 128 }
 129
 130 void setup_protocol(int f_out,int f_in)
 131 {
 132         if (am_sender)
 133                 file_extra_cnt += PTR_EXTRA_CNT;
 134         else
 135                 file_extra_cnt++;
 136         if (preserve_uid)
 137                 uid_ndx = ++file_extra_cnt;
 138         if (preserve_gid)
 139                 gid_ndx = ++file_extra_cnt;
 140         if (preserve_acls && !am_sender)
 141                 acls_ndx = ++file_extra_cnt;
 142         if (preserve_xattrs)
 143                 xattrs_ndx = ++file_extra_cnt;
 144
 145         if (am_server)
 146                 set_allow_inc_recurse();
 147
 148         if (remote_protocol == 0) {
 149                 if (am_server && !local_server)
 150                         check_sub_protocol();
 151                 if (!read_batch)
 152                         write_int(f_out, protocol_version);
 153                 remote_protocol = read_int(f_in);
 154                 if (protocol_version > remote_protocol)
 155                         protocol_version = remote_protocol;
 156         }
 157         if (read_batch && remote_protocol > protocol_version) {
 158                 rprintf(FERROR, "The protocol version in the batch file is too new (%d > %d).\n",
 159                         remote_protocol, protocol_version);
 160                 exit_cleanup(RERR_PROTOCOL);
 161         }
 162
 163         if (verbose > 3) {
 164                 rprintf(FINFO, "(%s) Protocol versions: remote=%d, negotiated=%d\n",
 165                         am_server? "Server" : "Client", remote_protocol, protocol_version);
 166         }
 167         if (remote_protocol < MIN_PROTOCOL_VERSION
 168          || remote_protocol > MAX_PROTOCOL_VERSION) {
 169                 rprintf(FERROR,"protocol version mismatch -- is your shell clean?\n");
 170                 rprintf(FERROR,"(see the rsync man page for an explanation)\n");
 171                 exit_cleanup(RERR_PROTOCOL);
 172         }
 173         if (remote_protocol < OLD_PROTOCOL_VERSION) {
 174                 rprintf(FINFO,"%s is very old version of rsync, upgrade recommended.\n",
 175                         am_server? "Client" : "Server");
 176         }
 177         if (protocol_version < MIN_PROTOCOL_VERSION) {
 178                 rprintf(FERROR, "--protocol must be at least %d on the %s.\n",
 179                         MIN_PROTOCOL_VERSION, am_server? "Server" : "Client");
 180                 exit_cleanup(RERR_PROTOCOL);
 181         }
 182         if (protocol_version > PROTOCOL_VERSION) {
 183                 rprintf(FERROR, "--protocol must be no more than %d on the %s.\n",
 184                         PROTOCOL_VERSION, am_server? "Server" : "Client");
 185                 exit_cleanup(RERR_PROTOCOL);
 186         }
 187         if (read_batch)
 188                 check_batch_flags();
 189
 190         if (protocol_version < 30) {
 191                 if (append_mode == 1)
 192                         append_mode = 2;
 193                 if (preserve_acls && !local_server) {
 194                         rprintf(FERROR,
 195                             "--acls requires protocol 30 or higher"
 196                             " (negotiated %d).\n",
 197                             protocol_version);
 198                         exit_cleanup(RERR_PROTOCOL);
 199                 }
 200                 if (preserve_xattrs && !local_server) {
 201                         rprintf(FERROR,
 202                             "--xattrs requires protocol 30 or higher"
 203                             " (negotiated %d).\n",
 204                             protocol_version);
 205                         exit_cleanup(RERR_PROTOCOL);
 206                 }
 207         }
 208
 209         if (delete_mode && !(delete_before+delete_during+delete_after)) {
 210                 if (protocol_version < 30)
 211                         delete_before = 1;
 212                 else
 213                         delete_during = 1;
 214         }
 215
 216         if (protocol_version < 29) {
 217                 if (fuzzy_basis) {
 218                         rprintf(FERROR,
 219                             "--fuzzy requires protocol 29 or higher"
 220                             " (negotiated %d).\n",
 221                             protocol_version);
 222                         exit_cleanup(RERR_PROTOCOL);
 223                 }
 224
 225                 if (basis_dir_cnt && inplace) {
 226                         rprintf(FERROR,
 227                             "%s with --inplace requires protocol 29 or higher"
 228                             " (negotiated %d).\n",
 229                             dest_option, protocol_version);
 230                         exit_cleanup(RERR_PROTOCOL);
 231                 }
 232
 233                 if (basis_dir_cnt > 1) {
 234                         rprintf(FERROR,
 235                             "Using more than one %s option requires protocol"
 236                             " 29 or higher (negotiated %d).\n",
 237                             dest_option, protocol_version);
 238                         exit_cleanup(RERR_PROTOCOL);
 239                 }
 240
 241                 if (prune_empty_dirs) {
 242                         rprintf(FERROR,
 243                             "--prune-empty-dirs requires protocol 29 or higher"
 244                             " (negotiated %d).\n",
 245                             protocol_version);
 246                         exit_cleanup(RERR_PROTOCOL);
 247                 }
 248         } else if (protocol_version >= 30) {
 249                 int compat_flags;
 250                 if (am_server) {
 251                         compat_flags = allow_inc_recurse ? CF_INC_RECURSE : 0;
 252 #if defined HAVE_LUTIMES && defined HAVE_UTIMES
 253                         compat_flags |= CF_SYMLINK_TIMES;
 254 #endif
 255 #ifdef ICONV_OPTION
 256                         compat_flags |= CF_SYMLINK_ICONV;
 257 #endif
 258                         write_byte(f_out, compat_flags);
 259                 } else
 260                         compat_flags = read_byte(f_in);
 261                 /* The inc_recurse var MUST be set to 0 or 1. */
 262                 inc_recurse = compat_flags & CF_INC_RECURSE ? 1 : 0;
 263                 if (am_sender) {
 264                         receiver_symlink_times = am_server
 265                             ? strchr(client_info, 'L') != NULL
 266                             : !!(compat_flags & CF_SYMLINK_TIMES);
 267                 }
 268 #if defined HAVE_LUTIMES && defined HAVE_UTIMES
 269                 else
 270                         receiver_symlink_times = 1;
 271 #endif
 272 #ifdef ICONV_OPTION
 273                 sender_symlink_iconv = iconv_opt && (am_server
 274                     ? local_server || strchr(client_info, 's') != NULL
 275                     : !!(compat_flags & CF_SYMLINK_ICONV));
 276 #endif
 277                 if (inc_recurse && !allow_inc_recurse) {
 278                         /* This should only be able to happen in a batch. */
 279                         fprintf(stderr,
 280                             "Incompatible options specified for inc-recursive %s.\n",
 281                             read_batch ? "batch file" : "connection");
 282                         exit_cleanup(RERR_SYNTAX);
 283                 }
 284                 need_messages_from_generator = 1;
 285 #if defined HAVE_LUTIMES && defined HAVE_UTIMES
 286         } else if (!am_sender) {
 287                 receiver_symlink_times = 1;
 288 #endif
 289         }
 290
 291         if (need_unsorted_flist && (!am_sender || inc_recurse))
 292                 unsort_ndx = ++file_extra_cnt;
 293
 294         if (partial_dir && *partial_dir != '/' && (!am_server || local_server)) {
 295                 int flags = MATCHFLG_NO_PREFIXES | MATCHFLG_DIRECTORY;
 296                 if (!am_sender || protocol_version >= 30)
 297                         flags |= MATCHFLG_PERISHABLE;
 298                 parse_rule(&filter_list, partial_dir, flags, 0);
 299         }
 300
 301
 302 #ifdef ICONV_OPTION
 303         if (protect_args && files_from) {
 304                 if (am_sender)
 305                         filesfrom_convert = filesfrom_host && ic_send != (iconv_t)-1;
 306                 else
 307                         filesfrom_convert = !filesfrom_host && ic_recv != (iconv_t)-1;
 308         }
 309 #endif
 310
 311         if (am_server) {
 312                 if (!checksum_seed)
 313                         checksum_seed = time(NULL);
 314                 write_int(f_out, checksum_seed);
 315         } else {
 316                 checksum_seed = read_int(f_in);
 317         }
 318 }