1 files changed, 75 insertions, 0 deletions
diff --git a/Godeps/_workspace/src/github.com/jackpal/gateway/gateway_linux.go b/Godeps/_workspace/src/github.com/jackpal/gateway/gateway_linux.go
new file mode 100644
index 000000000..333bde1dc
--- /dev/null
+++ b/Godeps/_workspace/src/github.com/jackpal/gateway/gateway_linux.go
@@ -0,0 +1,75 @@
+package gateway
+
+import (
+	"bytes"
+	"io/ioutil"
+	"net"
+	"os/exec"
+)
+
+func discoverGatewayUsingIp() (ip net.IP, err error) {
+	routeCmd := exec.Command("ip", "route", "show")
+	stdOut, err := routeCmd.StdoutPipe()
+	if err != nil {
+		return
+	}
+	if err = routeCmd.Start(); err != nil {
+		return
+	}
+	output, err := ioutil.ReadAll(stdOut)
+	if err != nil {
+		return
+	}
+
+	// Linux 'ip route show' format looks like this:
+	// default via 192.168.178.1 dev wlp3s0  metric 303
+	// 192.168.178.0/24 dev wlp3s0  proto kernel  scope link  src 192.168.178.76  metric 303
+	outputLines := bytes.Split(output, []byte("\n"))
+	for _, line := range outputLines {
+		if bytes.Contains(line, []byte("default")) {
+			ipFields := bytes.Fields(line)
+			ip = net.ParseIP(string(ipFields[2]))
+			break
+		}
+	}
+	err = routeCmd.Wait()
+	return
+}
+
+func discoverGatewayUsingRoute() (ip net.IP, err error) {
+	routeCmd := exec.Command("route", "-n")
+	stdOut, err := routeCmd.StdoutPipe()
+	if err != nil {
+		return
+	}
+	if err = routeCmd.Start(); err != nil {
+		return
+	}
+	output, err := ioutil.ReadAll(stdOut)
+	if err != nil {
+		return
+	}
+
+	// Linux route out format is always like this:
+	// Kernel IP routing table
+	// Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
+	// 0.0.0.0         192.168.1.1     0.0.0.0         UG    0      0        0 eth0
+	outputLines := bytes.Split(output, []byte("\n"))
+	for _, line := range outputLines {
+		if bytes.Contains(line, []byte("0.0.0.0")) {
+			ipFields := bytes.Fields(line)
+			ip = net.ParseIP(string(ipFields[1]))
+			break
+		}
+	}
+	err = routeCmd.Wait()
+	return
+}
+
+func DiscoverGateway() (ip net.IP, err error) {
+	ip, err = discoverGatewayUsingRoute()
+	if err != nil {
+		ip, err = discoverGatewayUsingIp()
+	}
+	return
+}