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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,26 @@ | ||
| //go:build linux | ||
|
|
||
| package net | ||
|
|
||
| import ( | ||
| "errors" | ||
| "fmt" | ||
| "syscall" | ||
|
|
||
| "github.com/vishvananda/netlink" | ||
| ) | ||
|
|
||
| var ErrNoDefaultRoute = errors.New("no default route") | ||
|
|
||
| func getDefaultIPv4RouteString() (string, error) { | ||
| routes, err := netlink.RouteListFiltered(syscall.AF_INET, &netlink.Route{Dst: nil}, netlink.RT_FILTER_DST) | ||
| if err != nil { | ||
| return "", fmt.Errorf("failed to get default route with error: %w", err) | ||
| } | ||
| for _, route := range routes { | ||
| if route.Dst == nil { | ||
| return route.Gw.String(), nil | ||
| } | ||
| } | ||
| return "", ErrNoDefaultRoute | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,43 @@ | ||
| //go:build linux | ||
|
|
||
| package net | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "os" | ||
| "os/exec" | ||
| "strings" | ||
| "testing" | ||
| ) | ||
|
|
||
| func Test_getDefaultIPv4Route(t *testing.T) { | ||
| if os.Getuid() != 0 { | ||
| t.Skip("skipping test; must be root to run") | ||
| } | ||
| // use cmd exec to parse and check `ip route show default` for a control value | ||
| cmd := exec.Command("ip", "route", "show", "default") | ||
| out, err := cmd.Output() | ||
| if err != nil { | ||
| t.Skipf("failed to get default route with error: %e", err) | ||
| } | ||
| if len(out) < 1 { | ||
| t.Skip("failed to get default route control value") | ||
| } | ||
| fields := bytes.Fields(out) | ||
| if len(fields) < 3 { | ||
| t.Skip("failed to get default route control value") | ||
| } | ||
| value := fields[2] | ||
| if len(value) < 1 { | ||
| t.Skip("failed to get default route control value") | ||
| } | ||
| t.Logf("control value: %s", string(value)) | ||
| var res string | ||
| if res, err = getDefaultIPv4RouteString(); err != nil { | ||
| t.Fatalf("failed to get default route with error: %e", err) | ||
| } | ||
| if !strings.EqualFold(res, string(value)) { | ||
| t.Fatalf("failed to get default route with error: %e", err) | ||
| } | ||
| t.Logf("default route: %s", res) | ||
| } |