Annotation of embedaddon/rsync/compat.c, revision 1.1
1.1 ! misho 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 verbose;
! 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 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 struct filter_list_struct 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 (verbose > 3) {
! 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: if (protocol_version < 30) {
! 194: if (append_mode == 1)
! 195: append_mode = 2;
! 196: if (preserve_acls && !local_server) {
! 197: rprintf(FERROR,
! 198: "--acls requires protocol 30 or higher"
! 199: " (negotiated %d).\n",
! 200: protocol_version);
! 201: exit_cleanup(RERR_PROTOCOL);
! 202: }
! 203: if (preserve_xattrs && !local_server) {
! 204: rprintf(FERROR,
! 205: "--xattrs requires protocol 30 or higher"
! 206: " (negotiated %d).\n",
! 207: protocol_version);
! 208: exit_cleanup(RERR_PROTOCOL);
! 209: }
! 210: }
! 211:
! 212: if (delete_mode && !(delete_before+delete_during+delete_after)) {
! 213: if (protocol_version < 30)
! 214: delete_before = 1;
! 215: else
! 216: delete_during = 1;
! 217: }
! 218:
! 219: if (protocol_version < 29) {
! 220: if (fuzzy_basis) {
! 221: rprintf(FERROR,
! 222: "--fuzzy requires protocol 29 or higher"
! 223: " (negotiated %d).\n",
! 224: protocol_version);
! 225: exit_cleanup(RERR_PROTOCOL);
! 226: }
! 227:
! 228: if (basis_dir_cnt && inplace) {
! 229: rprintf(FERROR,
! 230: "%s with --inplace requires protocol 29 or higher"
! 231: " (negotiated %d).\n",
! 232: dest_option, protocol_version);
! 233: exit_cleanup(RERR_PROTOCOL);
! 234: }
! 235:
! 236: if (basis_dir_cnt > 1) {
! 237: rprintf(FERROR,
! 238: "Using more than one %s option requires protocol"
! 239: " 29 or higher (negotiated %d).\n",
! 240: dest_option, protocol_version);
! 241: exit_cleanup(RERR_PROTOCOL);
! 242: }
! 243:
! 244: if (prune_empty_dirs) {
! 245: rprintf(FERROR,
! 246: "--prune-empty-dirs requires protocol 29 or higher"
! 247: " (negotiated %d).\n",
! 248: protocol_version);
! 249: exit_cleanup(RERR_PROTOCOL);
! 250: }
! 251: } else if (protocol_version >= 30) {
! 252: if (am_server) {
! 253: compat_flags = allow_inc_recurse ? CF_INC_RECURSE : 0;
! 254: #ifdef CAN_SET_SYMLINK_TIMES
! 255: compat_flags |= CF_SYMLINK_TIMES;
! 256: #endif
! 257: #ifdef ICONV_OPTION
! 258: compat_flags |= CF_SYMLINK_ICONV;
! 259: #endif
! 260: if (local_server || strchr(client_info, 'f') != NULL)
! 261: compat_flags |= CF_SAFE_FLIST;
! 262: write_byte(f_out, compat_flags);
! 263: } else
! 264: compat_flags = read_byte(f_in);
! 265: /* The inc_recurse var MUST be set to 0 or 1. */
! 266: inc_recurse = compat_flags & CF_INC_RECURSE ? 1 : 0;
! 267: if (am_sender) {
! 268: receiver_symlink_times = am_server
! 269: ? strchr(client_info, 'L') != NULL
! 270: : !!(compat_flags & CF_SYMLINK_TIMES);
! 271: }
! 272: #ifdef CAN_SET_SYMLINK_TIMES
! 273: else
! 274: receiver_symlink_times = 1;
! 275: #endif
! 276: #ifdef ICONV_OPTION
! 277: sender_symlink_iconv = iconv_opt && (am_server
! 278: ? local_server || strchr(client_info, 's') != NULL
! 279: : !!(compat_flags & CF_SYMLINK_ICONV));
! 280: #endif
! 281: if (inc_recurse && !allow_inc_recurse) {
! 282: /* This should only be able to happen in a batch. */
! 283: fprintf(stderr,
! 284: "Incompatible options specified for inc-recursive %s.\n",
! 285: read_batch ? "batch file" : "connection");
! 286: exit_cleanup(RERR_SYNTAX);
! 287: }
! 288: use_safe_inc_flist = !!(compat_flags & CF_SAFE_FLIST);
! 289: need_messages_from_generator = 1;
! 290: #ifdef CAN_SET_SYMLINK_TIMES
! 291: } else if (!am_sender) {
! 292: receiver_symlink_times = 1;
! 293: #endif
! 294: }
! 295:
! 296: if (need_unsorted_flist && (!am_sender || inc_recurse))
! 297: unsort_ndx = ++file_extra_cnt;
! 298:
! 299: if (partial_dir && *partial_dir != '/' && (!am_server || local_server)) {
! 300: int flags = MATCHFLG_NO_PREFIXES | MATCHFLG_DIRECTORY;
! 301: if (!am_sender || protocol_version >= 30)
! 302: flags |= MATCHFLG_PERISHABLE;
! 303: parse_rule(&filter_list, partial_dir, flags, 0);
! 304: }
! 305:
! 306:
! 307: #ifdef ICONV_OPTION
! 308: if (protect_args && files_from) {
! 309: if (am_sender)
! 310: filesfrom_convert = filesfrom_host && ic_send != (iconv_t)-1;
! 311: else
! 312: filesfrom_convert = !filesfrom_host && ic_recv != (iconv_t)-1;
! 313: }
! 314: #endif
! 315:
! 316: if (am_server) {
! 317: if (!checksum_seed)
! 318: checksum_seed = time(NULL);
! 319: write_int(f_out, checksum_seed);
! 320: } else {
! 321: checksum_seed = read_int(f_in);
! 322: }
! 323: }
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