refactor: put all network detection code in one place

probe/host/reporter.go

@@ -2,7 +2,6 @@ package host
 
 import (
 	"fmt"
-	"net"
 	"runtime"
 	"sync"
 	"time"
@@ -86,19 +85,7 @@ func NewReporter(hostID, hostName, probeID, version string, pipes controls.PipeC
 func (*Reporter) Name() string { return "Host" }
 
 // GetLocalNetworks is exported for mocking
-var GetLocalNetworks = func() ([]*net.IPNet, error) {
-	addrs, err := net.InterfaceAddrs()
-	if err != nil {
-		return nil, err
-	}
-	localNets := report.Networks{}
-	for _, addr := range addrs {
-		if ipnet, ok := addr.(*net.IPNet); ok && ipnet.IP.To4() != nil {
-			localNets = append(localNets, ipnet)
-		}
-	}
-	return localNets, nil
-}
+var GetLocalNetworks = report.GetLocalNetworks
 
 // Report implements Reporter.
 func (r *Reporter) Report() (report.Report, error) {

report/networks.go

@@ -82,3 +82,18 @@ func AddLocalBridge(name string) error {
 
 	return nil
 }
+
+// GetLocalNetworks returns all the local networks.
+func GetLocalNetworks() ([]*net.IPNet, error) {
+	addrs, err := net.InterfaceAddrs()
+	if err != nil {
+		return nil, err
+	}
+	localNets := Networks{}
+	for _, addr := range addrs {
+		if ipnet, ok := addr.(*net.IPNet); ok && ipnet.IP.To4() != nil {
+			localNets = append(localNets, ipnet)
+		}
+	}
+	return localNets, nil
+}