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go-netroute's Introduction

Go Netroute

Build Status

A cross-platform implementation of the gopacket/routing.Router interface.

This library is derived from gopacket for linux, x/net/route for mac, and iphlpapi.dll for windows.

Table of Contents

Install

go get github.com/libp2p/go-netroute

Usage

To be used for querying the local OS routing table.

import (
    netroute "github.com/libp2p/go-netroute"
)

func main() {
    r, err := netroute.New()
    if err != nil {
        panic(err)
    }
    iface, gw, src, err := r.Route(net.IPv4(127, 0, 0, 1))
    fmt.Printf("%v, %v, %v, %v\n", iface, gw, src, err)
}

Documentation

See the gopacket interface for thoughts on design, and godoc for API documentation.

Contribute

Contributions welcome. Please check out the issues.

Check out our contributing document for more information on how we work, and about contributing in general. Please be aware that all interactions related to multiformats are subject to the IPFS Code of Conduct.

Small note: If editing the README, please conform to the standard-readme specification.

License

BSD © Will Scott, and the Gopacket authors (i.e. Google)

go-netroute's People

Contributors

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go-netroute's Issues

Cannot find the route, in the case of many Iface

In Linux:

Gateway selection procedure:

go-netroute/common.go

Lines 142 to 155 in 263be50

for _, rt := range routes {
if rt.InputIface != 0 && rt.InputIface != inputIndex {
continue
}
if src != nil && rt.Src != nil && !rt.Src.Contains(src) {
continue
}
if rt.Dst != nil && !rt.Dst.Contains(dst) {
continue
}
if rt.IsMoreSpecThan(mostSpecificRt) {
mostSpecificRt = rt
}
}

But I find that I have a route that is all nill and has priority 0 (I don't know why):

image

I try to insert the following code to skip this route:

                if rt.Dst == nil && rt.Src == nil && rt.PrefSrc == nil && rt.Gateway == nil {
			continue
		}

It works.

wrong route rule selecting

On some android devices, the route table is showing below (dump as slice of rtInfo)

ALL V4 ROUTE: 
&{Src:<nil> Dst:172.17.0.0/16 Gateway:<nil> PrefSrc:172.17.0.1 InputIface:0 OutputIface:7 Priority:0}
&{Src:<nil> Dst:127.0.0.0/8 Gateway:<nil> PrefSrc:127.0.0.1 InputIface:0 OutputIface:1 Priority:0}
&{Src:<nil> Dst:127.0.0.1/32 Gateway:<nil> PrefSrc:127.0.0.1 InputIface:0 OutputIface:1 Priority:0}
&{Src:<nil> Dst:127.255.255.255/32 Gateway:<nil> PrefSrc:127.0.0.1 InputIface:0 OutputIface:1 Priority:0}
&{Src:<nil> Dst:172.17.0.1/32 Gateway:<nil> PrefSrc:172.17.0.1 InputIface:0 OutputIface:7 Priority:0}
&{Src:<nil> Dst:172.17.255.255/32 Gateway:<nil> PrefSrc:172.17.0.1 InputIface:0 OutputIface:7 Priority:0}
&{Src:<nil> Dst:192.168.1.145/32 Gateway:<nil> PrefSrc:192.168.1.145 InputIface:0 OutputIface:3 Priority:0}
&{Src:<nil> Dst:192.168.1.255/32 Gateway:<nil> PrefSrc:192.168.1.145 InputIface:0 OutputIface:3 Priority:0}
&{Src:<nil> Dst:<nil> Gateway:192.168.1.1 PrefSrc:192.168.1.145 InputIface:0 OutputIface:3 Priority:600}
&{Src:<nil> Dst:192.168.1.0/24 Gateway:<nil> PrefSrc:192.168.1.145 InputIface:0 OutputIface:3 Priority:600}

ALL V6 ROUTE:
&{Src:<nil> Dst:fe80::42:4fff:fe18:4c60/128 Gateway:<nil> PrefSrc:<nil> InputIface:0 OutputIface:7 Priority:0}
&{Src:<nil> Dst:fc03:1136:3849:fb4:6747:c508:ffef:0/128 Gateway:<nil> PrefSrc:<nil> InputIface:0 OutputIface:741 Priority:0}
&{Src:<nil> Dst:240e:36a:140b:5800::169/128 Gateway:<nil> PrefSrc:<nil> InputIface:0 OutputIface:3 Priority:0}
&{Src:<nil> Dst:240e:36a:140b:5800:5fb7:95ba:2f1e:8679/128 Gateway:<nil> PrefSrc:<nil> InputIface:0 OutputIface:3 Priority:0}
&{Src:<nil> Dst:::1/128 Gateway:<nil> PrefSrc:<nil> InputIface:0 OutputIface:1 Priority:0}
&{Src:<nil> Dst:fe80::cd13:d340:2662:fa5f/128 Gateway:<nil> PrefSrc:<nil> InputIface:0 OutputIface:741 Priority:0}
&{Src:<nil> Dst:fe80::1b61:8f5b:8d0c:47dd/128 Gateway:<nil> PrefSrc:<nil> InputIface:0 OutputIface:3 Priority:0}
&{Src:<nil> Dst:fe80::/64 Gateway:<nil> PrefSrc:<nil> InputIface:0 OutputIface:741 Priority:256}
&{Src:<nil> Dst:ff00::/8 Gateway:<nil> PrefSrc:<nil> InputIface:0 OutputIface:3 Priority:256}
&{Src:<nil> Dst:fc03:1136:3800::/40 Gateway:<nil> PrefSrc:<nil> InputIface:0 OutputIface:741 Priority:256}
&{Src:<nil> Dst:::1/128 Gateway:<nil> PrefSrc:<nil> InputIface:0 OutputIface:1 Priority:256}
&{Src:<nil> Dst:ff00::/8 Gateway:<nil> PrefSrc:<nil> InputIface:0 OutputIface:7 Priority:256}
&{Src:<nil> Dst:ff00::/8 Gateway:<nil> PrefSrc:<nil> InputIface:0 OutputIface:741 Priority:256}
&{Src:<nil> Dst:fe80::/64 Gateway:<nil> PrefSrc:<nil> InputIface:0 OutputIface:7 Priority:256}
&{Src:<nil> Dst:240e:36a:140b:5800::/64 Gateway:<nil> PrefSrc:<nil> InputIface:0 OutputIface:3 Priority:600}
&{Src:<nil> Dst:<nil> Gateway:fe80::3ecd:57ff:fef8:e384 PrefSrc:<nil> InputIface:0 OutputIface:3 Priority:600}
&{Src:<nil> Dst:240e:36a:140b:5800::169/128 Gateway:<nil> PrefSrc:<nil> InputIface:0 OutputIface:3 Priority:600}
&{Src:<nil> Dst:fe80::/64 Gateway:<nil> PrefSrc:<nil> InputIface:0 OutputIface:3 Priority:1024}
&{Src:<nil> Dst:240e:36a:140b:5800::/64 Gateway:<nil> PrefSrc:<nil> InputIface:0 OutputIface:36 Priority:1024}
&{Src:<nil> Dst:<nil> Gateway:fe80::3ecd:57ff:fef8:e384 PrefSrc:<nil> InputIface:0 OutputIface:36 Priority:1024}
&{Src:<nil> Dst:<nil> Gateway:<nil> PrefSrc:<nil> InputIface:0 OutputIface:1 Priority:4294967295}
&{Src:<nil> Dst:<nil> Gateway:<nil> PrefSrc:<nil> InputIface:0 OutputIface:1 Priority:4294967295}
&{Src:<nil> Dst:<nil> Gateway:<nil> PrefSrc:<nil> InputIface:0 OutputIface:1 Priority:4294967295}
&{Src:<nil> Dst:<nil> Gateway:<nil> PrefSrc:<nil> InputIface:0 OutputIface:1 Priority:4294967295}
&{Src:<nil> Dst:<nil> Gateway:<nil> PrefSrc:<nil> InputIface:0 OutputIface:1 Priority:4294967295}
&{Src:<nil> Dst:<nil> Gateway:<nil> PrefSrc:<nil> InputIface:0 OutputIface:1 Priority:4294967295}
&{Src:<nil> Dst:<nil> Gateway:<nil> PrefSrc:<nil> InputIface:0 OutputIface:1 Priority:4294967295}
&{Src:<nil> Dst:<nil> Gateway:<nil> PrefSrc:<nil> InputIface:0 OutputIface:1 Priority:4294967295}
&{Src:<nil> Dst:<nil> Gateway:<nil> PrefSrc:<nil> InputIface:0 OutputIface:1 Priority:4294967295}
&{Src:<nil> Dst:<nil> Gateway:<nil> PrefSrc:<nil> InputIface:0 OutputIface:1 Priority:4294967295}

when query route of :: the result is ::1 which is wrong. (it should be address of OutputIface 3)

Because any of the rule's dst is not contain the ::, the rules are compared by candSpec and curSpec. But the system's rules have many "empty dst" rules like above.

the go-netroute will choose the laste mpty dst rule because all they mask size is zero and so they are equal.

We should compare rule priority if other metrics are the same.

MAC Address Lookup Failed on Windows 

		if bytes.Equal(iface.HardwareAddr, ifRow.PhysAddr[:]) {
			return &iface
		}

Code above had error because ifRow.PhysAddr has code:

PhysAddr        [MAXLEN_PHYSADDR]byte

and MAXLEN_PHYSADDR is set by const MAXLEN_PHYSADDR = 8.

In my case, the last two bytes needs to be removed, thus:

iface.HardwareAddr, ifRow.PhysAddr[:6]

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