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