function::user_int16_error - Linux
Overview
function::user_int16_error assesses the user-defined int16 expressions entered into a packet. It examines whether the expression evaluates to a zero value, indicating a potential issue.
Syntax
function::user_int16_error [expression]
Options/Flags
None
Examples
Example 1: Checking for non-zero values
function::user_int16_error $eth.ip.len != 0
Example 2: Combine multiple expressions
function::user_int16_error ($eth.ip.len != 0 and $eth.ip.len != 65535)
Common Issues
- Ensure the expression is syntactically correct and evaluates to an int16 value.
- Avoid unnecessary complexity in expressions, as they may affect performance.
Integration
- Combine with other Lua functions for advanced packet analysis.
- Use within IDS/IPS systems to detect and handle potential issues identified by the expression.