Add panic handler

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[step-security-bot]

Please find StepSecurity AI-CodeWise code comments below.

Code Comments

netmon.go

• [High]Avoid using defer to handle panics in critical code paths
  The use of defer in critical code paths could lead to unexpected behaviors in case of a panic and make the program harder to reason about. Replace the defer statement with a recover() statement that would handle panics in a more controlled way.
• [Medium]Do not catch all exceptions and simply log them
  Catching all exceptions and simply logging them doesn't allow for sufficient control and handling of the exception, and can lead to unexpected behaviors. Catch only specific exceptions that the function knows how to handle. For other exceptions, either re-throw them or let them propagate up the call stack.

agent.go

• [High]Avoid using defer with panicHandler() function to recover from panics
  Defer statement with panicHandler() function is used to recover from panics. As per the Go documentation, explicit use of recover() is recommended over using defer with panic to handle panics. Additionally panicHandler() function is not defined in the given code snippet. Hence this usage of defer is highly recommended to be avoided. Use explicit recover() statements instead of defer to handle panics. Also, define the panicHandler() function and use it instead to recover from panics.
• [Medium]Define dnsConfig and sudo variables locally in the Run() function
  The variables dnsConfig and sudo are defined as package level variables which means they are accessible throughout the package. Since these variables are being updated inside the Run() function, it is recommended to define them locally to avoid any unintended changes that can happen in other parts of the package. Define dnsConfig and sudo variables locally inside the Run() function.
• [Medium]Use pointers to DnsConfig and Sudo structs instead of values
  The variables dnsConfig and sudo are structs. Passing them as values to the RevertChanges() function can lead to copying of large amounts of data on the stack. It is recommended to use pointers to these structs instead of values to avoid this performance overhead. Define dnsConfig and sudo variables as pointers to the DnsConfig and Sudo structs respectively, and use them accordingly.
• [Medium]Use named return values instead of defining and returning error variables explicitly
  The function signature of Run() function returns error explicitly defined, and an error channel is also passed around to handle any errors that might occur in the program. Using named return variables is a standard Go practice, and is recommended over defining and returning an error variable explicitly. Use named return variables instead of defining and returning an error variable explicitly.
• [Low]Use const variables where possible
  There are a few variable declarations which can be converted to constants since their values aren't expected to change throughout the program. Using const variables has the advantage of improved performance and better safety. Use const variables instead of variables whose values remain constant throughout the program.

dnsproxy.go

• [High]Avoid using defer with a naked call
  The use of panic handler with defers can cause the code to panic because of the improper handling of the function's call order. Use named returns or wrap the control flow in a conditional statement, such as an if statement, to handle errors instead of panicking.
• [Medium]Don't catch or handle panics if you don't intend to recover your program
  Panic handling can hide problems if it's not done properly. It's better to not catch or handle panics if you don't intend to recover your program. Remove the defer panicHandler() function call and let the program panic and abort normally.
• [Medium]Avoid code duplication
  Code duplication can lead to inconsistencies across the codebase and cause issues with maintainability and debugging. Refactor the duplicate DNS proxy code into a single function and call it as needed.
• [Low]Make use of Go's logging facilities
  Using print statements instead of proper logging can lead to issues with tracking down errors or issues with the code. Make use of Go's built-in logging infrastructure and/or third-party logging libraries.

eventhandler.go

• [High]Avoid using panic() and recover() in Go
  The code uses panic() function which may lead to unexpected program termination and can create security vulnerabilities. Replace panic() function with error handling mechanism using return statement stating the error message
• [Low]Assign variables to zero value when they are declared
  The code does not assign any initial value to the variable "eventHandler" before first use which may cause incorrect behavior of the function. Assign the variable "eventHandler" to its zero value before its first use. For example, "var eventHandler EventHandler" or "eventHandler = new(EventHandler)"

main.go

• [High]Avoid using debug.Stack() in production code
  The debug.Stack() function is intended for debugging purposes only and should not be used in production code. It can expose sensitive information that may aid attackers in their attempts to exploit the application. Replace debug.Stack() with an application-level logging mechanism that selectively captures stack traces only when necessary.
• [Medium]Ensure panic recovery is used consistently throughout the application
  Recovering from panics can help ensure the application remains operational in the presence of unexpected errors. However, the panicHandler() function is only called in one location. Ensure panic recovery is used consistently throughout the application to maximize its effectiveness. Identify critical sections of the application code and add panic recovery handlers to those sections.

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