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