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 int compat_flags = 0;
  28 int use_safe_inc_flist = 0;
  29
  30 extern int am_server;
  31 extern int am_sender;
  32 extern int local_server;
  33 extern int inplace;
  34 extern int recurse;
  35 extern int use_qsort;
  36 extern int allow_inc_recurse;
  37 extern int preallocate_files;
  38 extern int append_mode;
  39 extern int fuzzy_basis;
  40 extern int read_batch;
  41 extern int delay_updates;
  42 extern int checksum_seed;
  43 extern int basis_dir_cnt;
  44 extern int prune_empty_dirs;
  45 extern int protocol_version;
  46 extern int protect_args;
  47 extern int preserve_uid;
  48 extern int preserve_gid;
  49 extern int preserve_acls;
  50 extern int preserve_xattrs;
  51 extern int need_messages_from_generator;
  52 extern int delete_mode, delete_before, delete_during, delete_after;
  53 extern char *shell_cmd;
  54 extern char *partial_dir;
  55 extern char *dest_option;
  56 extern char *files_from;
  57 extern char *filesfrom_host;
  58 extern filter_rule_list filter_list;
  59 extern int need_unsorted_flist;
  60 #ifdef ICONV_OPTION
  61 extern iconv_t ic_send, ic_recv;
  62 extern char *iconv_opt;
  63 #endif
  64
  65 /* These index values are for the file-list's extra-attribute array. */
  66 int uid_ndx, gid_ndx, acls_ndx, xattrs_ndx, unsort_ndx;
  67
  68 int receiver_symlink_times = 0; /* receiver can set the time on a symlink */
  69 int sender_symlink_iconv = 0;   /* sender should convert symlink content */
  70
  71 #ifdef ICONV_OPTION
  72 int filesfrom_convert = 0;
  73 #endif
  74
  75 #define CF_INC_RECURSE   (1<<0)
  76 #define CF_SYMLINK_TIMES (1<<1)
  77 #define CF_SYMLINK_ICONV (1<<2)
  78 #define CF_SAFE_FLIST    (1<<3)
  79
  80 static const char *client_info;
  81
  82 /* The server makes sure that if either side only supports a pre-release
  83  * version of a protocol, that both sides must speak a compatible version
  84  * of that protocol for it to be advertised as available. */
  85 static void check_sub_protocol(void)
  86 {
  87         char *dot;
  88         int their_protocol, their_sub;
  89 #if SUBPROTOCOL_VERSION != 0
  90         int our_sub = protocol_version < PROTOCOL_VERSION ? 0 : SUBPROTOCOL_VERSION;
  91 #else
  92         int our_sub = 0;
  93 #endif
  94
  95         /* client_info starts with VER.SUB string if client is a pre-release. */
  96         if (!(their_protocol = atoi(client_info))
  97          || !(dot = strchr(client_info, '.'))
  98          || !(their_sub = atoi(dot+1))) {
  99 #if SUBPROTOCOL_VERSION != 0
 100                 if (our_sub)
 101                         protocol_version--;
 102 #endif
 103                 return;
 104         }
 105
 106         if (their_protocol < protocol_version) {
 107                 if (their_sub)
 108                         protocol_version = their_protocol - 1;
 109                 return;
 110         }
 111
 112         if (their_protocol > protocol_version)
 113                 their_sub = 0; /* 0 == final version of older protocol */
 114         if (their_sub != our_sub)
 115                 protocol_version--;
 116 }
 117
 118 void set_allow_inc_recurse(void)
 119 {
 120         client_info = shell_cmd ? shell_cmd : "";
 121
 122         if (!recurse || use_qsort)
 123                 allow_inc_recurse = 0;
 124         else if (!am_sender
 125          && (delete_before || delete_after
 126           || delay_updates || prune_empty_dirs))
 127                 allow_inc_recurse = 0;
 128         else if (am_server && !local_server
 129          && (strchr(client_info, 'i') == NULL))
 130                 allow_inc_recurse = 0;
 131 }
 132
 133 void setup_protocol(int f_out,int f_in)
 134 {
 135         if (am_sender)
 136                 file_extra_cnt += PTR_EXTRA_CNT;
 137         else
 138                 file_extra_cnt++;
 139         if (preserve_uid)
 140                 uid_ndx = ++file_extra_cnt;
 141         if (preserve_gid)
 142                 gid_ndx = ++file_extra_cnt;
 143         if (preserve_acls && !am_sender)
 144                 acls_ndx = ++file_extra_cnt;
 145         if (preserve_xattrs)
 146                 xattrs_ndx = ++file_extra_cnt;
 147
 148         if (am_server)
 149                 set_allow_inc_recurse();
 150
 151         if (remote_protocol == 0) {
 152                 if (am_server && !local_server)
 153                         check_sub_protocol();
 154                 if (!read_batch)
 155                         write_int(f_out, protocol_version);
 156                 remote_protocol = read_int(f_in);
 157                 if (protocol_version > remote_protocol)
 158                         protocol_version = remote_protocol;
 159         }
 160         if (read_batch && remote_protocol > protocol_version) {
 161                 rprintf(FERROR, "The protocol version in the batch file is too new (%d > %d).\n",
 162                         remote_protocol, protocol_version);
 163                 exit_cleanup(RERR_PROTOCOL);
 164         }
 165
 166         if (DEBUG_GTE(PROTO, 1)) {
 167                 rprintf(FINFO, "(%s) Protocol versions: remote=%d, negotiated=%d\n",
 168                         am_server? "Server" : "Client", remote_protocol, protocol_version);
 169         }
 170         if (remote_protocol < MIN_PROTOCOL_VERSION
 171          || remote_protocol > MAX_PROTOCOL_VERSION) {
 172                 rprintf(FERROR,"protocol version mismatch -- is your shell clean?\n");
 173                 rprintf(FERROR,"(see the rsync man page for an explanation)\n");
 174                 exit_cleanup(RERR_PROTOCOL);
 175         }
 176         if (remote_protocol < OLD_PROTOCOL_VERSION) {
 177                 rprintf(FINFO,"%s is very old version of rsync, upgrade recommended.\n",
 178                         am_server? "Client" : "Server");
 179         }
 180         if (protocol_version < MIN_PROTOCOL_VERSION) {
 181                 rprintf(FERROR, "--protocol must be at least %d on the %s.\n",
 182                         MIN_PROTOCOL_VERSION, am_server? "Server" : "Client");
 183                 exit_cleanup(RERR_PROTOCOL);
 184         }
 185         if (protocol_version > PROTOCOL_VERSION) {
 186                 rprintf(FERROR, "--protocol must be no more than %d on the %s.\n",
 187                         PROTOCOL_VERSION, am_server? "Server" : "Client");
 188                 exit_cleanup(RERR_PROTOCOL);
 189         }
 190         if (read_batch)
 191                 check_batch_flags();
 192
 193 #ifndef SUPPORT_PREALLOCATION
 194         if (preallocate_files && !am_sender) {
 195                 rprintf(FERROR, "preallocation is not supported on this %s\n",
 196                         am_server ? "Server" : "Client");
 197                 exit_cleanup(RERR_SYNTAX);
 198         }
 199 #endif
 200
 201         if (protocol_version < 30) {
 202                 if (append_mode == 1)
 203                         append_mode = 2;
 204                 if (preserve_acls && !local_server) {
 205                         rprintf(FERROR,
 206                             "--acls requires protocol 30 or higher"
 207                             " (negotiated %d).\n",
 208                             protocol_version);
 209                         exit_cleanup(RERR_PROTOCOL);
 210                 }
 211                 if (preserve_xattrs && !local_server) {
 212                         rprintf(FERROR,
 213                             "--xattrs requires protocol 30 or higher"
 214                             " (negotiated %d).\n",
 215                             protocol_version);
 216                         exit_cleanup(RERR_PROTOCOL);
 217                 }
 218         }
 219
 220         if (delete_mode && !(delete_before+delete_during+delete_after)) {
 221                 if (protocol_version < 30)
 222                         delete_before = 1;
 223                 else
 224                         delete_during = 1;
 225         }
 226
 227         if (protocol_version < 29) {
 228                 if (fuzzy_basis) {
 229                         rprintf(FERROR,
 230                             "--fuzzy requires protocol 29 or higher"
 231                             " (negotiated %d).\n",
 232                             protocol_version);
 233                         exit_cleanup(RERR_PROTOCOL);
 234                 }
 235
 236                 if (basis_dir_cnt && inplace) {
 237                         rprintf(FERROR,
 238                             "%s with --inplace requires protocol 29 or higher"
 239                             " (negotiated %d).\n",
 240                             dest_option, protocol_version);
 241                         exit_cleanup(RERR_PROTOCOL);
 242                 }
 243
 244                 if (basis_dir_cnt > 1) {
 245                         rprintf(FERROR,
 246                             "Using more than one %s option requires protocol"
 247                             " 29 or higher (negotiated %d).\n",
 248                             dest_option, protocol_version);
 249                         exit_cleanup(RERR_PROTOCOL);
 250                 }
 251
 252                 if (prune_empty_dirs) {
 253                         rprintf(FERROR,
 254                             "--prune-empty-dirs requires protocol 29 or higher"
 255                             " (negotiated %d).\n",
 256                             protocol_version);
 257                         exit_cleanup(RERR_PROTOCOL);
 258                 }
 259         } else if (protocol_version >= 30) {
 260                 if (am_server) {
 261                         compat_flags = allow_inc_recurse ? CF_INC_RECURSE : 0;
 262 #ifdef CAN_SET_SYMLINK_TIMES
 263                         compat_flags |= CF_SYMLINK_TIMES;
 264 #endif
 265 #ifdef ICONV_OPTION
 266                         compat_flags |= CF_SYMLINK_ICONV;
 267 #endif
 268                         if (local_server || strchr(client_info, 'f') != NULL)
 269                                 compat_flags |= CF_SAFE_FLIST;
 270                         write_byte(f_out, compat_flags);
 271                 } else
 272                         compat_flags = read_byte(f_in);
 273                 /* The inc_recurse var MUST be set to 0 or 1. */
 274                 inc_recurse = compat_flags & CF_INC_RECURSE ? 1 : 0;
 275                 if (am_sender) {
 276                         receiver_symlink_times = am_server
 277                             ? strchr(client_info, 'L') != NULL
 278                             : !!(compat_flags & CF_SYMLINK_TIMES);
 279                 }
 280 #ifdef CAN_SET_SYMLINK_TIMES
 281                 else
 282                         receiver_symlink_times = 1;
 283 #endif
 284 #ifdef ICONV_OPTION
 285                 sender_symlink_iconv = iconv_opt && (am_server
 286                     ? local_server || strchr(client_info, 's') != NULL
 287                     : !!(compat_flags & CF_SYMLINK_ICONV));
 288 #endif
 289                 if (inc_recurse && !allow_inc_recurse) {
 290                         /* This should only be able to happen in a batch. */
 291                         fprintf(stderr,
 292                             "Incompatible options specified for inc-recursive %s.\n",
 293                             read_batch ? "batch file" : "connection");
 294                         exit_cleanup(RERR_SYNTAX);
 295                 }
 296                 use_safe_inc_flist = (compat_flags & CF_SAFE_FLIST) || protocol_version >= 31;
 297                 need_messages_from_generator = 1;
 298 #ifdef CAN_SET_SYMLINK_TIMES
 299         } else if (!am_sender) {
 300                 receiver_symlink_times = 1;
 301 #endif
 302         }
 303
 304         if (need_unsorted_flist && (!am_sender || inc_recurse))
 305                 unsort_ndx = ++file_extra_cnt;
 306
 307         if (partial_dir && *partial_dir != '/' && (!am_server || local_server)) {
 308                 int rflags = FILTRULE_NO_PREFIXES | FILTRULE_DIRECTORY;
 309                 if (!am_sender || protocol_version >= 30)
 310                         rflags |= FILTRULE_PERISHABLE;
 311                 parse_filter_str(&filter_list, partial_dir, rule_template(rflags), 0);
 312         }
 313
 314
 315 #ifdef ICONV_OPTION
 316         if (protect_args && files_from) {
 317                 if (am_sender)
 318                         filesfrom_convert = filesfrom_host && ic_send != (iconv_t)-1;
 319                 else
 320                         filesfrom_convert = !filesfrom_host && ic_recv != (iconv_t)-1;
 321         }
 322 #endif
 323
 324         if (am_server) {
 325                 if (!checksum_seed)
 326                         checksum_seed = time(NULL);
 327                 write_int(f_out, checksum_seed);
 328         } else {
 329                 checksum_seed = read_int(f_in);
 330         }
 331 }