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) 2004-2014 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 int want_xattr_optim = 0;
  30 int proper_seed_order = 0;
  31
  32 extern int am_server;
  33 extern int am_sender;
  34 extern int local_server;
  35 extern int inplace;
  36 extern int recurse;
  37 extern int use_qsort;
  38 extern int allow_inc_recurse;
  39 extern int preallocate_files;
  40 extern int append_mode;
  41 extern int fuzzy_basis;
  42 extern int read_batch;
  43 extern int delay_updates;
  44 extern int checksum_seed;
  45 extern int basis_dir_cnt;
  46 extern int prune_empty_dirs;
  47 extern int protocol_version;
  48 extern int protect_args;
  49 extern int preserve_uid;
  50 extern int preserve_gid;
  51 extern int preserve_acls;
  52 extern int preserve_xattrs;
  53 extern int need_messages_from_generator;
  54 extern int delete_mode, delete_before, delete_during, delete_after;
  55 extern char *shell_cmd;
  56 extern char *partial_dir;
  57 extern char *dest_option;
  58 extern char *files_from;
  59 extern char *filesfrom_host;
  60 extern filter_rule_list filter_list;
  61 extern int need_unsorted_flist;
  62 #ifdef ICONV_OPTION
  63 extern iconv_t ic_send, ic_recv;
  64 extern char *iconv_opt;
  65 #endif
  66
  67 /* These index values are for the file-list's extra-attribute array. */
  68 int uid_ndx, gid_ndx, acls_ndx, xattrs_ndx, unsort_ndx;
  69
  70 int receiver_symlink_times = 0; /* receiver can set the time on a symlink */
  71 int sender_symlink_iconv = 0;   /* sender should convert symlink content */
  72
  73 #ifdef ICONV_OPTION
  74 int filesfrom_convert = 0;
  75 #endif
  76
  77 #define CF_INC_RECURSE   (1<<0)
  78 #define CF_SYMLINK_TIMES (1<<1)
  79 #define CF_SYMLINK_ICONV (1<<2)
  80 #define CF_SAFE_FLIST    (1<<3)
  81 #define CF_AVOID_XATTR_OPTIM (1<<4)
  82 #define CF_CHKSUM_SEED_FIX (1<<5)
  83
  84 static const char *client_info;
  85
  86 /* The server makes sure that if either side only supports a pre-release
  87  * version of a protocol, that both sides must speak a compatible version
  88  * of that protocol for it to be advertised as available. */
  89 static void check_sub_protocol(void)
  90 {
  91         char *dot;
  92         int their_protocol, their_sub;
  93 #if SUBPROTOCOL_VERSION != 0
  94         int our_sub = protocol_version < PROTOCOL_VERSION ? 0 : SUBPROTOCOL_VERSION;
  95 #else
  96         int our_sub = 0;
  97 #endif
  98
  99         /* client_info starts with VER.SUB string if client is a pre-release. */
 100         if (!(their_protocol = atoi(client_info))
 101          || !(dot = strchr(client_info, '.'))
 102          || !(their_sub = atoi(dot+1))) {
 103 #if SUBPROTOCOL_VERSION != 0
 104                 if (our_sub)
 105                         protocol_version--;
 106 #endif
 107                 return;
 108         }
 109
 110         if (their_protocol < protocol_version) {
 111                 if (their_sub)
 112                         protocol_version = their_protocol - 1;
 113                 return;
 114         }
 115
 116         if (their_protocol > protocol_version)
 117                 their_sub = 0; /* 0 == final version of older protocol */
 118         if (their_sub != our_sub)
 119                 protocol_version--;
 120 }
 121
 122 void set_allow_inc_recurse(void)
 123 {
 124         client_info = shell_cmd ? shell_cmd : "";
 125
 126         if (!recurse || use_qsort)
 127                 allow_inc_recurse = 0;
 128         else if (!am_sender
 129          && (delete_before || delete_after
 130           || delay_updates || prune_empty_dirs))
 131                 allow_inc_recurse = 0;
 132         else if (am_server && !local_server
 133          && (strchr(client_info, 'i') == NULL))
 134                 allow_inc_recurse = 0;
 135 }
 136
 137 void setup_protocol(int f_out,int f_in)
 138 {
 139         if (am_sender)
 140                 file_extra_cnt += PTR_EXTRA_CNT;
 141         else
 142                 file_extra_cnt++;
 143         if (preserve_uid)
 144                 uid_ndx = ++file_extra_cnt;
 145         if (preserve_gid)
 146                 gid_ndx = ++file_extra_cnt;
 147         if (preserve_acls && !am_sender)
 148                 acls_ndx = ++file_extra_cnt;
 149         if (preserve_xattrs)
 150                 xattrs_ndx = ++file_extra_cnt;
 151
 152         if (am_server)
 153                 set_allow_inc_recurse();
 154
 155         if (remote_protocol == 0) {
 156                 if (am_server && !local_server)
 157                         check_sub_protocol();
 158                 if (!read_batch)
 159                         write_int(f_out, protocol_version);
 160                 remote_protocol = read_int(f_in);
 161                 if (protocol_version > remote_protocol)
 162                         protocol_version = remote_protocol;
 163         }
 164         if (read_batch && remote_protocol > protocol_version) {
 165                 rprintf(FERROR, "The protocol version in the batch file is too new (%d > %d).\n",
 166                         remote_protocol, protocol_version);
 167                 exit_cleanup(RERR_PROTOCOL);
 168         }
 169
 170         if (DEBUG_GTE(PROTO, 1)) {
 171                 rprintf(FINFO, "(%s) Protocol versions: remote=%d, negotiated=%d\n",
 172                         am_server? "Server" : "Client", remote_protocol, protocol_version);
 173         }
 174         if (remote_protocol < MIN_PROTOCOL_VERSION
 175          || remote_protocol > MAX_PROTOCOL_VERSION) {
 176                 rprintf(FERROR,"protocol version mismatch -- is your shell clean?\n");
 177                 rprintf(FERROR,"(see the rsync man page for an explanation)\n");
 178                 exit_cleanup(RERR_PROTOCOL);
 179         }
 180         if (remote_protocol < OLD_PROTOCOL_VERSION) {
 181                 rprintf(FINFO,"%s is very old version of rsync, upgrade recommended.\n",
 182                         am_server? "Client" : "Server");
 183         }
 184         if (protocol_version < MIN_PROTOCOL_VERSION) {
 185                 rprintf(FERROR, "--protocol must be at least %d on the %s.\n",
 186                         MIN_PROTOCOL_VERSION, am_server? "Server" : "Client");
 187                 exit_cleanup(RERR_PROTOCOL);
 188         }
 189         if (protocol_version > PROTOCOL_VERSION) {
 190                 rprintf(FERROR, "--protocol must be no more than %d on the %s.\n",
 191                         PROTOCOL_VERSION, am_server? "Server" : "Client");
 192                 exit_cleanup(RERR_PROTOCOL);
 193         }
 194         if (read_batch)
 195                 check_batch_flags();
 196
 197 #ifndef SUPPORT_PREALLOCATION
 198         if (preallocate_files && !am_sender) {
 199                 rprintf(FERROR, "preallocation is not supported on this %s\n",
 200                         am_server ? "Server" : "Client");
 201                 exit_cleanup(RERR_SYNTAX);
 202         }
 203 #endif
 204
 205         if (protocol_version < 30) {
 206                 if (append_mode == 1)
 207                         append_mode = 2;
 208                 if (preserve_acls && !local_server) {
 209                         rprintf(FERROR,
 210                             "--acls requires protocol 30 or higher"
 211                             " (negotiated %d).\n",
 212                             protocol_version);
 213                         exit_cleanup(RERR_PROTOCOL);
 214                 }
 215                 if (preserve_xattrs && !local_server) {
 216                         rprintf(FERROR,
 217                             "--xattrs requires protocol 30 or higher"
 218                             " (negotiated %d).\n",
 219                             protocol_version);
 220                         exit_cleanup(RERR_PROTOCOL);
 221                 }
 222         }
 223
 224         if (delete_mode && !(delete_before+delete_during+delete_after)) {
 225                 if (protocol_version < 30)
 226                         delete_before = 1;
 227                 else
 228                         delete_during = 1;
 229         }
 230
 231         if (protocol_version < 29) {
 232                 if (fuzzy_basis) {
 233                         rprintf(FERROR,
 234                             "--fuzzy requires protocol 29 or higher"
 235                             " (negotiated %d).\n",
 236                             protocol_version);
 237                         exit_cleanup(RERR_PROTOCOL);
 238                 }
 239
 240                 if (basis_dir_cnt && inplace) {
 241                         rprintf(FERROR,
 242                             "%s with --inplace requires protocol 29 or higher"
 243                             " (negotiated %d).\n",
 244                             dest_option, protocol_version);
 245                         exit_cleanup(RERR_PROTOCOL);
 246                 }
 247
 248                 if (basis_dir_cnt > 1) {
 249                         rprintf(FERROR,
 250                             "Using more than one %s option requires protocol"
 251                             " 29 or higher (negotiated %d).\n",
 252                             dest_option, protocol_version);
 253                         exit_cleanup(RERR_PROTOCOL);
 254                 }
 255
 256                 if (prune_empty_dirs) {
 257                         rprintf(FERROR,
 258                             "--prune-empty-dirs requires protocol 29 or higher"
 259                             " (negotiated %d).\n",
 260                             protocol_version);
 261                         exit_cleanup(RERR_PROTOCOL);
 262                 }
 263         } else if (protocol_version >= 30) {
 264                 if (am_server) {
 265                         compat_flags = allow_inc_recurse ? CF_INC_RECURSE : 0;
 266 #ifdef CAN_SET_SYMLINK_TIMES
 267                         compat_flags |= CF_SYMLINK_TIMES;
 268 #endif
 269 #ifdef ICONV_OPTION
 270                         compat_flags |= CF_SYMLINK_ICONV;
 271 #endif
 272                         if (local_server || strchr(client_info, 'f') != NULL)
 273                                 compat_flags |= CF_SAFE_FLIST;
 274                         if (local_server || strchr(client_info, 'x') != NULL)
 275                                 compat_flags |= CF_AVOID_XATTR_OPTIM;
 276                         if (local_server || strchr(client_info, 'C') != NULL)
 277                                 compat_flags |= CF_CHKSUM_SEED_FIX;
 278                         write_byte(f_out, compat_flags);
 279                 } else
 280                         compat_flags = read_byte(f_in);
 281                 /* The inc_recurse var MUST be set to 0 or 1. */
 282                 inc_recurse = compat_flags & CF_INC_RECURSE ? 1 : 0;
 283                 want_xattr_optim = protocol_version >= 31 && !(compat_flags & CF_AVOID_XATTR_OPTIM);
 284                 proper_seed_order = compat_flags & CF_CHKSUM_SEED_FIX ? 1 : 0;
 285                 if (am_sender) {
 286                         receiver_symlink_times = am_server
 287                             ? strchr(client_info, 'L') != NULL
 288                             : !!(compat_flags & CF_SYMLINK_TIMES);
 289                 }
 290 #ifdef CAN_SET_SYMLINK_TIMES
 291                 else
 292                         receiver_symlink_times = 1;
 293 #endif
 294 #ifdef ICONV_OPTION
 295                 sender_symlink_iconv = iconv_opt && (am_server
 296                     ? local_server || strchr(client_info, 's') != NULL
 297                     : !!(compat_flags & CF_SYMLINK_ICONV));
 298 #endif
 299                 if (inc_recurse && !allow_inc_recurse) {
 300                         /* This should only be able to happen in a batch. */
 301                         fprintf(stderr,
 302                             "Incompatible options specified for inc-recursive %s.\n",
 303                             read_batch ? "batch file" : "connection");
 304                         exit_cleanup(RERR_SYNTAX);
 305                 }
 306                 use_safe_inc_flist = (compat_flags & CF_SAFE_FLIST) || protocol_version >= 31;
 307                 need_messages_from_generator = 1;
 308 #ifdef CAN_SET_SYMLINK_TIMES
 309         } else if (!am_sender) {
 310                 receiver_symlink_times = 1;
 311 #endif
 312         }
 313
 314         if (need_unsorted_flist && (!am_sender || inc_recurse))
 315                 unsort_ndx = ++file_extra_cnt;
 316
 317         if (partial_dir && *partial_dir != '/' && (!am_server || local_server)) {
 318                 int rflags = FILTRULE_NO_PREFIXES | FILTRULE_DIRECTORY;
 319                 if (!am_sender || protocol_version >= 30)
 320                         rflags |= FILTRULE_PERISHABLE;
 321                 parse_filter_str(&filter_list, partial_dir, rule_template(rflags), 0);
 322         }
 323
 324
 325 #ifdef ICONV_OPTION
 326         if (protect_args && files_from) {
 327                 if (am_sender)
 328                         filesfrom_convert = filesfrom_host && ic_send != (iconv_t)-1;
 329                 else
 330                         filesfrom_convert = !filesfrom_host && ic_recv != (iconv_t)-1;
 331         }
 332 #endif
 333
 334         if (am_server) {
 335                 if (!checksum_seed)
 336                         checksum_seed = time(NULL) ^ (getpid() << 6);
 337                 write_int(f_out, checksum_seed);
 338         } else {
 339                 checksum_seed = read_int(f_in);
 340         }
 341 }