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Table of Contents
4 Header and data length
Overview
Header and data length are present in response and request messages between Zabbix components. It is required to determine the length of message.
<HEADER> - "ZBXD\x01" (5 bytes)
<DATALEN> - data length (8 bytes). 1 will be formatted as 01/00/00/00/00/00/00/00 (eight bytes, 64 bit number in little-endian format)To not exhaust memory (potentially) Zabbix protocol is limited to accept only 128MB in one connection.
Implementation
Here are code snippets showing how to add Zabbix protocol header to the data you want to send in order to obtain packet you should send to Zabbix so it is interpreted correctly.
| Language | Code |
|---|---|
| bash | printf -v LENGTH '%016x' "${#DATA}"PACK=""for i in {14..0..-2}; do PACK="$PACK\\x${LENGTH:$i:2}"; doneprintf "ZBXD\1$PACK%s" $DATA |
| Java | byte[] header = new byte[] {'Z', 'B', 'X', 'D', '\1',(byte)(data.length & 0xFF),(byte)((data.length >> 8) & 0xFF),(byte)((data.length >> 16) & 0xFF),(byte)((data.length >> 24) & 0xFF),'\0', '\0', '\0', '\0'};| |<|byte[] packet = new byte[header.length + data.length];System.arraycopy(header, 0, packet, 0, header.length);System.arraycopy(data, 0, packet, header.length, data.length); |
| PHP | $packet = "ZBXD\1" . pack('P', strlen($data)) . $data;or$packet = "ZBXD\1" . pack('V', strlen($data)) . "\0\0\0\0" . $data; |
| Perl | my $packet = "ZBXD\1" . pack('<Q', length($data)) . $data;ormy $packet = "ZBXD\1" . pack('V', length($data)) . "\0\0\0\0" . $data; |
| Python | packet = "ZBXD\1" + struct.pack('<Q', len(data)) + data |