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