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rsync 3.2.3

    1: #!/usr/bin/env bash
    2: # Send an error message via the rsync-protocol to a non-daemon client rsync.
    3: #
    4: # Usage:  deny-rsync "message"
    5: 
    6: protocol_version=29
    7: exit_code=4 # same as a daemon that refuses an option
    8: 
    9: # e.g. byte_escape 29 => \035
   10: function byte_escape {
   11:     echo -ne "\\0$(printf "%o" $1)"
   12: }
   13: 
   14: msg="$1"
   15: if [ "${#msg}" -gt 254 ]; then
   16:     # truncate a message that is too long for this naive script to handle
   17:     msg="${msg:0:251}..."
   18: fi
   19: msglen=$(( ${#msg} + 1 )) # add 1 for the newline we append below
   20: 
   21: # Send protocol version.  All numbers are LSB-first 4-byte ints.
   22: echo -ne "$(byte_escape $protocol_version)\\000\\000\\000"
   23: 
   24: # Send a zero checksum seed.
   25: echo -ne "\\000\\000\\000\\000"
   26: 
   27: # The following is equivalent to rprintf(FERROR_XFER, "%s\n", $msg).
   28: # 1. Message header: ((MPLEX_BASE + FERROR_XFER) << 24) + $msglen.
   29: echo -ne "$(byte_escape $msglen)\\000\\000\\010"
   30: # 2. The actual data.
   31: echo -E "$msg"
   32: 
   33: # Make sure the client gets our message, not a write failure.
   34: sleep 1
   35: 
   36: exit $exit_code