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gateway

A simple library for discovering the IP address of the default gateway.

Example:

package main

import (
    "fmt"

    "github.com/jackpal/gateway"
)

func main() {
    gateway, err := gateway.DiscoverGateway()
    if err != nil {
        fmt.Println(err)
    } else {
        fmt.Println("Gateway:", gateway.String())
   }
}

Provides implementations for:

  • Darwin (macOS)
  • Dragonfly
  • FreeBSD
  • Linux
  • NetBSD
  • OpenBSD
  • Solaris and illumos
  • Windows

Other platforms use an implementation that always returns an error.

Pull requests for other OSs happily considered!

Versions

v1.0.15

Update dependencies to latest versions. This was done to squelch a github security alert caused by depending upon an old version of x/net. This is the first time I've updated module versions, the tests pass, so hopefully everything's good.

v1.0.14

v1.0.13

  • Add tools/check-cross-compile.sh to check that the code compiles for various OSs.
  • Fix compilation errors exposed by tools/check-cross-compile.sh.

v1.0.12

  • If there are multiple default gateways, Windows now returns the gateway with the lowest metric.
  • Fix solaris build break. (In theory, IDK how to test this easily.)
  • Upgrade to golang 1.21
  • Upgrade golang.org/x/net version, makes dependabot happy. Probably was not any actual security issue because gateway doesn't use any of the APIs of golang.org/x/net that had security issues.

v1.0.11

  • Implement DiscoverInterface for BSD-like OSes.

v1.0.10

  • Fix non-BSD-based builds.

v1.0.9

  • Add go.mod and go.sum files.
  • Use "golang.org/x/net/route" to implement all BSD variants.
    • As a side effect this adds support for Dragonfly and NetBSD.
  • Add example to README.
  • Remove broken continuous integration.

v1.0.8

  • Add support for OpenBSD
  • Linux parser now supports gateways with an IP address of 0.0.0.0
  • Fall back to netstat on darwin systems if route fails.
  • Simplify Linux /proc/net/route parsers.