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