vendor: Revert to github.com/jackpal/gateway instead of fork

It now includes all the fixes

GitHub-Pull-Request: https://github.com/syncthing/syncthing/pull/3246

vendor/github.com/jackpal/gateway/LICENSE

@@ -0,0 +1,27 @@
+// Copyright (c) 2010 Jack Palevich. All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//    * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//    * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//    * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

vendor/github.com/jackpal/gateway/gateway_common.go

@@ -0,0 +1,129 @@
+package gateway
+
+import (
+	"errors"
+	"net"
+	"strings"
+)
+
+var errNoGateway = errors.New("no gateway found")
+
+func parseWindowsRoutePrint(output []byte) (net.IP, error) {
+	// Windows route output format is always like this:
+	// ===========================================================================
+	// Active Routes:
+	// Network Destination        Netmask          Gateway       Interface  Metric
+	//           0.0.0.0          0.0.0.0      192.168.1.1    192.168.1.100     20
+	// ===========================================================================
+	// I'm trying to pick the active route,
+	// then jump 2 lines and pick the third IP
+	// Not using regex because output is quite standard from Windows XP to 8 (NEEDS TESTING)
+	lines := strings.Split(string(output), "\n")
+	for idx, line := range lines {
+		if strings.HasPrefix(line, "Active Routes:") {
+			if len(lines) <= idx+2 {
+				return nil, errNoGateway
+			}
+
+			fields := strings.Fields(lines[idx+2])
+			if len(fields) < 3 {
+				return nil, errNoGateway
+			}
+
+			ip := net.ParseIP(fields[2])
+			if ip != nil {
+				return ip, nil
+			}
+		}
+	}
+	return nil, errNoGateway
+}
+
+func parseLinuxIPRoute(output []byte) (net.IP, error) {
+	// Linux '/usr/bin/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
+	lines := strings.Split(string(output), "\n")
+	for _, line := range lines {
+		fields := strings.Fields(line)
+		if len(fields) >= 3 && fields[0] == "default" {
+			ip := net.ParseIP(fields[2])
+			if ip != nil {
+				return ip, nil
+			}
+		}
+	}
+
+	return nil, errNoGateway
+}
+
+func parseLinuxRoute(output []byte) (net.IP, error) {
+	// 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
+	lines := strings.Split(string(output), "\n")
+	for _, line := range lines {
+		fields := strings.Fields(line)
+		if len(fields) >= 2 && fields[0] == "0.0.0.0" {
+			ip := net.ParseIP(fields[1])
+			if ip != nil {
+				return ip, nil
+			}
+		}
+	}
+
+	return nil, errNoGateway
+}
+
+func parseDarwinRouteGet(output []byte) (net.IP, error) {
+	// Darwin route out format is always like this:
+	//    route to: default
+	// destination: default
+	//        mask: default
+	//     gateway: 192.168.1.1
+	lines := strings.Split(string(output), "\n")
+	for _, line := range lines {
+		fields := strings.Fields(line)
+		if len(fields) >= 2 && fields[0] == "gateway:" {
+			ip := net.ParseIP(fields[1])
+			if ip != nil {
+				return ip, nil
+			}
+		}
+	}
+
+	return nil, errNoGateway
+}
+
+func parseBSDSolarisNetstat(output []byte) (net.IP, error) {
+	// netstat -rn produces the following on FreeBSD:
+	// Routing tables
+	//
+	// Internet:
+	// Destination        Gateway            Flags      Netif Expire
+	// default            10.88.88.2         UGS         em0
+	// 10.88.88.0/24      link#1             U           em0
+	// 10.88.88.148       link#1             UHS         lo0
+	// 127.0.0.1          link#2             UH          lo0
+	//
+	// Internet6:
+	// Destination                       Gateway                       Flags      Netif Expire
+	// ::/96                             ::1                           UGRS        lo0
+	// ::1                               link#2                        UH          lo0
+	// ::ffff:0.0.0.0/96                 ::1                           UGRS        lo0
+	// fe80::/10                         ::1                           UGRS        lo0
+	// ...
+	outputLines := strings.Split(string(output), "\n")
+	for _, line := range outputLines {
+		fields := strings.Fields(line)
+		if len(fields) >= 2 && fields[0] == "default" {
+			ip := net.ParseIP(fields[1])
+			if ip != nil {
+				return ip, nil
+			}
+		}
+	}
+
+	return nil, errNoGateway
+}

vendor/github.com/jackpal/gateway/gateway_darwin.go

@@ -0,0 +1,16 @@
+package gateway
+
+import (
+	"net"
+	"os/exec"
+)
+
+func DiscoverGateway() (net.IP, error) {
+	routeCmd := exec.Command("/sbin/route", "-n", "get", "0.0.0.0")
+	output, err := routeCmd.CombinedOutput()
+	if err != nil {
+		return nil, err
+	}
+
+	return parseDarwinRouteGet(output)
+}

vendor/github.com/jackpal/gateway/gateway_freebsd.go

@@ -0,0 +1,16 @@
+package gateway
+
+import (
+	"net"
+	"os/exec"
+)
+
+func DiscoverGateway() (ip net.IP, err error) {
+	routeCmd := exec.Command("netstat", "-rn")
+	output, err := routeCmd.CombinedOutput()
+	if err != nil {
+		return nil, err
+	}
+
+	return parseBSDSolarisNetstat(output)
+}

vendor/github.com/jackpal/gateway/gateway_linux.go

@@ -0,0 +1,34 @@
+package gateway
+
+import (
+	"net"
+	"os/exec"
+)
+
+func DiscoverGateway() (ip net.IP, err error) {
+	ip, err = discoverGatewayUsingRoute()
+	if err != nil {
+		ip, err = discoverGatewayUsingIp()
+	}
+	return
+}
+
+func discoverGatewayUsingIp() (net.IP, error) {
+	routeCmd := exec.Command("/usr/bin/ip", "route", "show")
+	output, err := routeCmd.CombinedOutput()
+	if err != nil {
+		return nil, err
+	}
+
+	return parseLinuxIPRoute(output)
+}
+
+func discoverGatewayUsingRoute() (net.IP, error) {
+	routeCmd := exec.Command("/usr/bin/route", "-n")
+	output, err := routeCmd.CombinedOutput()
+	if err != nil {
+		return nil, err
+	}
+
+	return parseLinuxRoute(output)
+}

vendor/github.com/jackpal/gateway/gateway_solaris.go

@@ -0,0 +1,16 @@
+package gateway
+
+import (
+	"net"
+	"os/exec"
+)
+
+func DiscoverGateway() (ip net.IP, err error) {
+	routeCmd := exec.Command("netstat", "-rn")
+	output, err := routeCmd.CombinedOutput()
+	if err != nil {
+		return nil, err
+	}
+
+	return parseBSDSolarisNetstat(output)
+}

vendor/github.com/jackpal/gateway/gateway_unimplemented.go

@@ -0,0 +1,14 @@
+// +build !darwin,!linux,!windows,!solaris,!freebsd
+
+package gateway
+
+import (
+	"fmt"
+	"net"
+	"runtime"
+)
+
+func DiscoverGateway() (ip net.IP, err error) {
+	err = fmt.Errorf("DiscoverGateway not implemented for OS %s", runtime.GOOS)
+	return
+}

vendor/github.com/jackpal/gateway/gateway_windows.go

@@ -0,0 +1,16 @@
+package gateway
+
+import (
+	"net"
+	"os/exec"
+)
+
+func DiscoverGateway() (ip net.IP, err error) {
+	routeCmd := exec.Command("route", "print", "0.0.0.0")
+	output, err := routeCmd.CombinedOutput()
+	if err != nil {
+		return nil, err
+	}
+
+	return parseWindowsRoutePrint(output)
+}