mirror of
https://github.com/tailscale/tailscale.git
synced 2025-03-25 02:31:00 +00:00
ed8587f90d
Prep for #1591 which will need to make Linux's router react to changes that the link monitor observes. The router package already depended on the monitor package transitively. Now it's explicit. Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
716 lines
20 KiB
Go
716 lines
20 KiB
Go
// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package router
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import (
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"bytes"
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"errors"
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"fmt"
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"math/rand"
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"os"
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"sort"
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"strings"
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"sync/atomic"
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"testing"
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"github.com/google/go-cmp/cmp"
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"golang.zx2c4.com/wireguard/tun"
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"inet.af/netaddr"
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"tailscale.com/types/logger"
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"tailscale.com/wgengine/monitor"
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)
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func TestRouterStates(t *testing.T) {
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basic := `
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ip rule add -4 pref 5210 fwmark 0x80000 table main
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ip rule add -4 pref 5230 fwmark 0x80000 table default
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ip rule add -4 pref 5250 fwmark 0x80000 type unreachable
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ip rule add -4 pref 5270 table 52
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ip rule add -6 pref 5210 fwmark 0x80000 table main
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ip rule add -6 pref 5230 fwmark 0x80000 table default
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ip rule add -6 pref 5250 fwmark 0x80000 type unreachable
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ip rule add -6 pref 5270 table 52
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`
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states := []struct {
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name string
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in *Config
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want string
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}{
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{
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name: "no config",
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in: nil,
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want: `
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up` + basic,
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},
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{
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name: "local addr only",
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in: &Config{
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LocalAddrs: mustCIDRs("100.101.102.103/10"),
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NetfilterMode: netfilterOff,
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},
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want: `
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up
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ip addr add 100.101.102.103/10 dev tailscale0` + basic,
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},
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{
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name: "addr and routes",
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in: &Config{
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LocalAddrs: mustCIDRs("100.101.102.103/10"),
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Routes: mustCIDRs("100.100.100.100/32", "192.168.16.0/24"),
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NetfilterMode: netfilterOff,
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},
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want: `
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up
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ip addr add 100.101.102.103/10 dev tailscale0
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ip route add 100.100.100.100/32 dev tailscale0 table 52
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ip route add 192.168.16.0/24 dev tailscale0 table 52` + basic,
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},
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{
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name: "addr and routes and subnet routes",
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in: &Config{
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LocalAddrs: mustCIDRs("100.101.102.103/10"),
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Routes: mustCIDRs("100.100.100.100/32", "192.168.16.0/24"),
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SubnetRoutes: mustCIDRs("200.0.0.0/8"),
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NetfilterMode: netfilterOff,
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},
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want: `
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up
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ip addr add 100.101.102.103/10 dev tailscale0
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ip route add 100.100.100.100/32 dev tailscale0 table 52
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ip route add 192.168.16.0/24 dev tailscale0 table 52` + basic,
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},
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{
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name: "addr and routes and subnet routes with netfilter",
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in: &Config{
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LocalAddrs: mustCIDRs("100.101.102.104/10"),
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Routes: mustCIDRs("100.100.100.100/32", "10.0.0.0/8"),
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SubnetRoutes: mustCIDRs("200.0.0.0/8"),
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SNATSubnetRoutes: true,
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NetfilterMode: netfilterOn,
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},
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want: `
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up
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ip addr add 100.101.102.104/10 dev tailscale0
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ip route add 10.0.0.0/8 dev tailscale0 table 52
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ip route add 100.100.100.100/32 dev tailscale0 table 52` + basic +
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`v4/filter/FORWARD -j ts-forward
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v4/filter/INPUT -j ts-input
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v4/filter/ts-forward -i tailscale0 -j MARK --set-mark 0x40000
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v4/filter/ts-forward -m mark --mark 0x40000 -j ACCEPT
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v4/filter/ts-forward -o tailscale0 -s 100.64.0.0/10 -j DROP
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v4/filter/ts-forward -o tailscale0 -j ACCEPT
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v4/filter/ts-input -i lo -s 100.101.102.104 -j ACCEPT
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v4/filter/ts-input ! -i tailscale0 -s 100.115.92.0/23 -j RETURN
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v4/filter/ts-input ! -i tailscale0 -s 100.64.0.0/10 -j DROP
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v4/nat/POSTROUTING -j ts-postrouting
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v4/nat/ts-postrouting -m mark --mark 0x40000 -j MASQUERADE
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v6/filter/FORWARD -j ts-forward
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v6/filter/INPUT -j ts-input
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v6/filter/ts-forward -i tailscale0 -j MARK --set-mark 0x40000
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v6/filter/ts-forward -m mark --mark 0x40000 -j ACCEPT
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v6/filter/ts-forward -o tailscale0 -j ACCEPT
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v6/nat/POSTROUTING -j ts-postrouting
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v6/nat/ts-postrouting -m mark --mark 0x40000 -j MASQUERADE
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`,
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},
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{
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name: "addr and routes with netfilter",
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in: &Config{
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LocalAddrs: mustCIDRs("100.101.102.104/10"),
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Routes: mustCIDRs("100.100.100.100/32", "10.0.0.0/8"),
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NetfilterMode: netfilterOn,
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},
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want: `
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up
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ip addr add 100.101.102.104/10 dev tailscale0
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ip route add 10.0.0.0/8 dev tailscale0 table 52
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ip route add 100.100.100.100/32 dev tailscale0 table 52` + basic +
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`v4/filter/FORWARD -j ts-forward
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v4/filter/INPUT -j ts-input
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v4/filter/ts-forward -i tailscale0 -j MARK --set-mark 0x40000
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v4/filter/ts-forward -m mark --mark 0x40000 -j ACCEPT
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v4/filter/ts-forward -o tailscale0 -s 100.64.0.0/10 -j DROP
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v4/filter/ts-forward -o tailscale0 -j ACCEPT
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v4/filter/ts-input -i lo -s 100.101.102.104 -j ACCEPT
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v4/filter/ts-input ! -i tailscale0 -s 100.115.92.0/23 -j RETURN
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v4/filter/ts-input ! -i tailscale0 -s 100.64.0.0/10 -j DROP
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v4/nat/POSTROUTING -j ts-postrouting
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v6/filter/FORWARD -j ts-forward
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v6/filter/INPUT -j ts-input
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v6/filter/ts-forward -i tailscale0 -j MARK --set-mark 0x40000
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v6/filter/ts-forward -m mark --mark 0x40000 -j ACCEPT
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v6/filter/ts-forward -o tailscale0 -j ACCEPT
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v6/nat/POSTROUTING -j ts-postrouting
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`,
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},
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{
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name: "addr and routes and subnet routes with netfilter but no SNAT",
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in: &Config{
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LocalAddrs: mustCIDRs("100.101.102.104/10"),
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Routes: mustCIDRs("100.100.100.100/32", "10.0.0.0/8"),
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SubnetRoutes: mustCIDRs("200.0.0.0/8"),
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SNATSubnetRoutes: false,
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NetfilterMode: netfilterOn,
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},
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want: `
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up
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ip addr add 100.101.102.104/10 dev tailscale0
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ip route add 10.0.0.0/8 dev tailscale0 table 52
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ip route add 100.100.100.100/32 dev tailscale0 table 52` + basic +
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`v4/filter/FORWARD -j ts-forward
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v4/filter/INPUT -j ts-input
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v4/filter/ts-forward -i tailscale0 -j MARK --set-mark 0x40000
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v4/filter/ts-forward -m mark --mark 0x40000 -j ACCEPT
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v4/filter/ts-forward -o tailscale0 -s 100.64.0.0/10 -j DROP
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v4/filter/ts-forward -o tailscale0 -j ACCEPT
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v4/filter/ts-input -i lo -s 100.101.102.104 -j ACCEPT
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v4/filter/ts-input ! -i tailscale0 -s 100.115.92.0/23 -j RETURN
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v4/filter/ts-input ! -i tailscale0 -s 100.64.0.0/10 -j DROP
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v4/nat/POSTROUTING -j ts-postrouting
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v6/filter/FORWARD -j ts-forward
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v6/filter/INPUT -j ts-input
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v6/filter/ts-forward -i tailscale0 -j MARK --set-mark 0x40000
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v6/filter/ts-forward -m mark --mark 0x40000 -j ACCEPT
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v6/filter/ts-forward -o tailscale0 -j ACCEPT
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v6/nat/POSTROUTING -j ts-postrouting
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`,
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},
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{
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name: "addr and routes with netfilter",
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in: &Config{
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LocalAddrs: mustCIDRs("100.101.102.104/10"),
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Routes: mustCIDRs("100.100.100.100/32", "10.0.0.0/8"),
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NetfilterMode: netfilterOn,
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},
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want: `
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up
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ip addr add 100.101.102.104/10 dev tailscale0
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ip route add 10.0.0.0/8 dev tailscale0 table 52
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ip route add 100.100.100.100/32 dev tailscale0 table 52` + basic +
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`v4/filter/FORWARD -j ts-forward
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v4/filter/INPUT -j ts-input
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v4/filter/ts-forward -i tailscale0 -j MARK --set-mark 0x40000
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v4/filter/ts-forward -m mark --mark 0x40000 -j ACCEPT
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v4/filter/ts-forward -o tailscale0 -s 100.64.0.0/10 -j DROP
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v4/filter/ts-forward -o tailscale0 -j ACCEPT
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v4/filter/ts-input -i lo -s 100.101.102.104 -j ACCEPT
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v4/filter/ts-input ! -i tailscale0 -s 100.115.92.0/23 -j RETURN
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v4/filter/ts-input ! -i tailscale0 -s 100.64.0.0/10 -j DROP
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v4/nat/POSTROUTING -j ts-postrouting
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v6/filter/FORWARD -j ts-forward
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v6/filter/INPUT -j ts-input
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v6/filter/ts-forward -i tailscale0 -j MARK --set-mark 0x40000
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v6/filter/ts-forward -m mark --mark 0x40000 -j ACCEPT
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v6/filter/ts-forward -o tailscale0 -j ACCEPT
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v6/nat/POSTROUTING -j ts-postrouting
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`,
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},
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{
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name: "addr and routes with half netfilter",
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in: &Config{
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LocalAddrs: mustCIDRs("100.101.102.104/10"),
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Routes: mustCIDRs("100.100.100.100/32", "10.0.0.0/8"),
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NetfilterMode: netfilterNoDivert,
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},
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want: `
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up
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ip addr add 100.101.102.104/10 dev tailscale0
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ip route add 10.0.0.0/8 dev tailscale0 table 52
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ip route add 100.100.100.100/32 dev tailscale0 table 52` + basic +
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`v4/filter/ts-forward -i tailscale0 -j MARK --set-mark 0x40000
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v4/filter/ts-forward -m mark --mark 0x40000 -j ACCEPT
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v4/filter/ts-forward -o tailscale0 -s 100.64.0.0/10 -j DROP
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v4/filter/ts-forward -o tailscale0 -j ACCEPT
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v4/filter/ts-input -i lo -s 100.101.102.104 -j ACCEPT
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v4/filter/ts-input ! -i tailscale0 -s 100.115.92.0/23 -j RETURN
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v4/filter/ts-input ! -i tailscale0 -s 100.64.0.0/10 -j DROP
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v6/filter/ts-forward -i tailscale0 -j MARK --set-mark 0x40000
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v6/filter/ts-forward -m mark --mark 0x40000 -j ACCEPT
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v6/filter/ts-forward -o tailscale0 -j ACCEPT
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`,
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},
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{
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name: "addr and routes with netfilter2",
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in: &Config{
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LocalAddrs: mustCIDRs("100.101.102.104/10"),
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Routes: mustCIDRs("100.100.100.100/32", "10.0.0.0/8"),
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NetfilterMode: netfilterOn,
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},
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want: `
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up
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ip addr add 100.101.102.104/10 dev tailscale0
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ip route add 10.0.0.0/8 dev tailscale0 table 52
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ip route add 100.100.100.100/32 dev tailscale0 table 52` + basic +
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`v4/filter/FORWARD -j ts-forward
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v4/filter/INPUT -j ts-input
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v4/filter/ts-forward -i tailscale0 -j MARK --set-mark 0x40000
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v4/filter/ts-forward -m mark --mark 0x40000 -j ACCEPT
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v4/filter/ts-forward -o tailscale0 -s 100.64.0.0/10 -j DROP
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v4/filter/ts-forward -o tailscale0 -j ACCEPT
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v4/filter/ts-input -i lo -s 100.101.102.104 -j ACCEPT
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v4/filter/ts-input ! -i tailscale0 -s 100.115.92.0/23 -j RETURN
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v4/filter/ts-input ! -i tailscale0 -s 100.64.0.0/10 -j DROP
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v4/nat/POSTROUTING -j ts-postrouting
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v6/filter/FORWARD -j ts-forward
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v6/filter/INPUT -j ts-input
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v6/filter/ts-forward -i tailscale0 -j MARK --set-mark 0x40000
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v6/filter/ts-forward -m mark --mark 0x40000 -j ACCEPT
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v6/filter/ts-forward -o tailscale0 -j ACCEPT
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v6/nat/POSTROUTING -j ts-postrouting
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`,
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},
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{
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name: "addr, routes, and local routes with netfilter",
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in: &Config{
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LocalAddrs: mustCIDRs("100.101.102.104/10"),
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Routes: mustCIDRs("100.100.100.100/32", "0.0.0.0/0"),
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LocalRoutes: mustCIDRs("10.0.0.0/8"),
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NetfilterMode: netfilterOn,
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},
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want: `
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up
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ip addr add 100.101.102.104/10 dev tailscale0
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ip route add 0.0.0.0/0 dev tailscale0 table 52
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ip route add 100.100.100.100/32 dev tailscale0 table 52
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ip route add throw 10.0.0.0/8 table 52` + basic +
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`v4/filter/FORWARD -j ts-forward
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v4/filter/INPUT -j ts-input
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v4/filter/ts-forward -i tailscale0 -j MARK --set-mark 0x40000
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v4/filter/ts-forward -m mark --mark 0x40000 -j ACCEPT
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v4/filter/ts-forward -o tailscale0 -s 100.64.0.0/10 -j DROP
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v4/filter/ts-forward -o tailscale0 -j ACCEPT
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v4/filter/ts-input -i lo -s 100.101.102.104 -j ACCEPT
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v4/filter/ts-input ! -i tailscale0 -s 100.115.92.0/23 -j RETURN
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v4/filter/ts-input ! -i tailscale0 -s 100.64.0.0/10 -j DROP
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v4/nat/POSTROUTING -j ts-postrouting
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v6/filter/FORWARD -j ts-forward
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v6/filter/INPUT -j ts-input
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v6/filter/ts-forward -i tailscale0 -j MARK --set-mark 0x40000
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v6/filter/ts-forward -m mark --mark 0x40000 -j ACCEPT
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v6/filter/ts-forward -o tailscale0 -j ACCEPT
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v6/nat/POSTROUTING -j ts-postrouting
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`,
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},
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{
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name: "addr, routes, and local routes with no netfilter",
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in: &Config{
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LocalAddrs: mustCIDRs("100.101.102.104/10"),
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Routes: mustCIDRs("100.100.100.100/32", "0.0.0.0/0"),
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LocalRoutes: mustCIDRs("10.0.0.0/8", "192.168.0.0/24"),
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NetfilterMode: netfilterOff,
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},
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want: `
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up
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ip addr add 100.101.102.104/10 dev tailscale0
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ip route add 0.0.0.0/0 dev tailscale0 table 52
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ip route add 100.100.100.100/32 dev tailscale0 table 52
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ip route add throw 10.0.0.0/8 table 52
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ip route add throw 192.168.0.0/24 table 52` + basic,
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},
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}
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mon, err := monitor.New(logger.Discard)
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if err != nil {
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t.Fatal(err)
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}
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mon.Start()
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defer mon.Close()
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fake := NewFakeOS(t)
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router, err := newUserspaceRouterAdvanced(t.Logf, "tailscale0", mon, fake.netfilter4, fake.netfilter6, fake, true, true)
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if err != nil {
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t.Fatalf("failed to create router: %v", err)
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}
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if err := router.Up(); err != nil {
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t.Fatalf("failed to up router: %v", err)
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}
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testState := func(t *testing.T, i int) {
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t.Helper()
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if err := router.Set(states[i].in); err != nil {
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t.Fatalf("failed to set router config: %v", err)
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}
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got := fake.String()
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want := strings.TrimSpace(states[i].want)
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if diff := cmp.Diff(got, want); diff != "" {
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t.Fatalf("unexpected OS state (-got+want):\n%s", diff)
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}
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}
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for i, state := range states {
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t.Run(state.name, func(t *testing.T) { testState(t, i) })
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}
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// Cycle through a bunch of states in pseudorandom order, to
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// verify that we transition cleanly from state to state no matter
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// the order.
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for randRun := 0; randRun < 5*len(states); randRun++ {
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i := rand.Intn(len(states))
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state := states[i]
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t.Run(state.name, func(t *testing.T) { testState(t, i) })
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}
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}
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type fakeNetfilter struct {
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t *testing.T
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n map[string][]string
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}
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func newNetfilter(t *testing.T) *fakeNetfilter {
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return &fakeNetfilter{
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t: t,
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n: map[string][]string{
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"filter/INPUT": nil,
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"filter/OUTPUT": nil,
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"filter/FORWARD": nil,
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"nat/PREROUTING": nil,
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"nat/OUTPUT": nil,
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"nat/POSTROUTING": nil,
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},
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}
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}
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func (n *fakeNetfilter) Insert(table, chain string, pos int, args ...string) error {
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k := table + "/" + chain
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if rules, ok := n.n[k]; ok {
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if pos > len(rules)+1 {
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n.t.Errorf("bad position %d in %s", pos, k)
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return errExec
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}
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rules = append(rules, "")
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copy(rules[pos:], rules[pos-1:])
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rules[pos-1] = strings.Join(args, " ")
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n.n[k] = rules
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} else {
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n.t.Errorf("unknown table/chain %s", k)
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return errExec
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}
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return nil
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}
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func (n *fakeNetfilter) Append(table, chain string, args ...string) error {
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k := table + "/" + chain
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return n.Insert(table, chain, len(n.n[k])+1, args...)
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}
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func (n *fakeNetfilter) Exists(table, chain string, args ...string) (bool, error) {
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k := table + "/" + chain
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if rules, ok := n.n[k]; ok {
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|
for _, rule := range rules {
|
|
if rule == strings.Join(args, " ") {
|
|
return true, nil
|
|
}
|
|
}
|
|
return false, nil
|
|
} else {
|
|
n.t.Errorf("unknown table/chain %s", k)
|
|
return false, errExec
|
|
}
|
|
}
|
|
|
|
func (n *fakeNetfilter) Delete(table, chain string, args ...string) error {
|
|
k := table + "/" + chain
|
|
if rules, ok := n.n[k]; ok {
|
|
for i, rule := range rules {
|
|
if rule == strings.Join(args, " ") {
|
|
rules = append(rules[:i], rules[i+1:]...)
|
|
n.n[k] = rules
|
|
return nil
|
|
}
|
|
}
|
|
n.t.Errorf("delete of unknown rule %q from %s", strings.Join(args, " "), k)
|
|
return errExec
|
|
} else {
|
|
n.t.Errorf("unknown table/chain %s", k)
|
|
return errExec
|
|
}
|
|
}
|
|
|
|
func (n *fakeNetfilter) ClearChain(table, chain string) error {
|
|
k := table + "/" + chain
|
|
if _, ok := n.n[k]; ok {
|
|
n.n[k] = nil
|
|
return nil
|
|
} else {
|
|
n.t.Logf("note: ClearChain: unknown table/chain %s", k)
|
|
return errors.New("exitcode:1")
|
|
}
|
|
}
|
|
|
|
func (n *fakeNetfilter) NewChain(table, chain string) error {
|
|
k := table + "/" + chain
|
|
if _, ok := n.n[k]; ok {
|
|
n.t.Errorf("table/chain %s already exists", k)
|
|
return errExec
|
|
}
|
|
n.n[k] = nil
|
|
return nil
|
|
}
|
|
|
|
func (n *fakeNetfilter) DeleteChain(table, chain string) error {
|
|
k := table + "/" + chain
|
|
if rules, ok := n.n[k]; ok {
|
|
if len(rules) != 0 {
|
|
n.t.Errorf("%s is not empty", k)
|
|
return errExec
|
|
}
|
|
delete(n.n, k)
|
|
return nil
|
|
} else {
|
|
n.t.Errorf("%s does not exist", k)
|
|
return errExec
|
|
}
|
|
}
|
|
|
|
// fakeOS implements commandRunner and provides v4 and v6
|
|
// netfilterRunners, but captures changes without touching the OS.
|
|
type fakeOS struct {
|
|
t *testing.T
|
|
up bool
|
|
ips []string
|
|
routes []string
|
|
rules []string
|
|
netfilter4 *fakeNetfilter
|
|
netfilter6 *fakeNetfilter
|
|
}
|
|
|
|
func NewFakeOS(t *testing.T) *fakeOS {
|
|
return &fakeOS{
|
|
t: t,
|
|
netfilter4: newNetfilter(t),
|
|
netfilter6: newNetfilter(t),
|
|
}
|
|
}
|
|
|
|
var errExec = errors.New("execution failed")
|
|
|
|
func (o *fakeOS) String() string {
|
|
var b strings.Builder
|
|
if o.up {
|
|
b.WriteString("up\n")
|
|
} else {
|
|
b.WriteString("down\n")
|
|
}
|
|
|
|
for _, ip := range o.ips {
|
|
fmt.Fprintf(&b, "ip addr add %s\n", ip)
|
|
}
|
|
|
|
for _, route := range o.routes {
|
|
fmt.Fprintf(&b, "ip route add %s\n", route)
|
|
}
|
|
|
|
for _, rule := range o.rules {
|
|
fmt.Fprintf(&b, "ip rule add %s\n", rule)
|
|
}
|
|
|
|
var chains []string
|
|
for chain := range o.netfilter4.n {
|
|
chains = append(chains, chain)
|
|
}
|
|
sort.Strings(chains)
|
|
for _, chain := range chains {
|
|
for _, rule := range o.netfilter4.n[chain] {
|
|
fmt.Fprintf(&b, "v4/%s %s\n", chain, rule)
|
|
}
|
|
}
|
|
|
|
chains = nil
|
|
for chain := range o.netfilter6.n {
|
|
chains = append(chains, chain)
|
|
}
|
|
sort.Strings(chains)
|
|
for _, chain := range chains {
|
|
for _, rule := range o.netfilter6.n[chain] {
|
|
fmt.Fprintf(&b, "v6/%s %s\n", chain, rule)
|
|
}
|
|
}
|
|
|
|
return b.String()[:len(b.String())-1]
|
|
}
|
|
|
|
func (o *fakeOS) run(args ...string) error {
|
|
unexpected := func() error {
|
|
o.t.Errorf("unexpected invocation %q", strings.Join(args, " "))
|
|
return errors.New("unrecognized invocation")
|
|
}
|
|
if args[0] != "ip" {
|
|
return unexpected()
|
|
}
|
|
|
|
if len(args) == 2 && args[1] == "rule" {
|
|
// naked invocation of `ip rule` is a feature test. Return
|
|
// successfully.
|
|
return nil
|
|
}
|
|
|
|
family := ""
|
|
rest := strings.Join(args[3:], " ")
|
|
if args[1] == "-4" || args[1] == "-6" {
|
|
family = args[1]
|
|
copy(args[1:], args[2:])
|
|
args = args[:len(args)-1]
|
|
rest = family + " " + strings.Join(args[3:], " ")
|
|
}
|
|
|
|
var l *[]string
|
|
switch args[1] {
|
|
case "link":
|
|
got := strings.Join(args[2:], " ")
|
|
switch got {
|
|
case "set dev tailscale0 up":
|
|
o.up = true
|
|
case "set dev tailscale0 down":
|
|
o.up = false
|
|
default:
|
|
return unexpected()
|
|
}
|
|
return nil
|
|
case "addr":
|
|
l = &o.ips
|
|
case "route":
|
|
l = &o.routes
|
|
case "rule":
|
|
l = &o.rules
|
|
default:
|
|
return unexpected()
|
|
}
|
|
|
|
switch args[2] {
|
|
case "add":
|
|
for _, el := range *l {
|
|
if el == rest {
|
|
o.t.Errorf("can't add %q, already present", rest)
|
|
return errors.New("already exists")
|
|
}
|
|
}
|
|
*l = append(*l, rest)
|
|
sort.Strings(*l)
|
|
case "del":
|
|
found := false
|
|
for i, el := range *l {
|
|
if el == rest {
|
|
found = true
|
|
*l = append((*l)[:i], (*l)[i+1:]...)
|
|
break
|
|
}
|
|
}
|
|
if !found {
|
|
o.t.Logf("note: can't delete %q, not present", rest)
|
|
// 'ip rule del' exits with code 2 when a row is
|
|
// missing. We don't want to consider that an error,
|
|
// for cleanup purposes.
|
|
|
|
// TODO(apenwarr): this is a hack.
|
|
// I'd like to return an exec.ExitError(2) here, but
|
|
// I can't, because the ExitCode is implemented in
|
|
// os.ProcessState, which is an opaque object I can't
|
|
// instantiate or modify. Go's 75 levels of abstraction
|
|
// between me and an 8-bit int are really paying off
|
|
// here, as you can see.
|
|
return errors.New("exitcode:2")
|
|
}
|
|
default:
|
|
return unexpected()
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (o *fakeOS) output(args ...string) ([]byte, error) {
|
|
want := "ip rule list priority 10000"
|
|
got := strings.Join(args, " ")
|
|
if got != want {
|
|
o.t.Errorf("unexpected command that wants output: %v", got)
|
|
return nil, errExec
|
|
}
|
|
|
|
var ret []string
|
|
for _, rule := range o.rules {
|
|
if strings.Contains(rule, "10000") {
|
|
ret = append(ret, rule)
|
|
}
|
|
}
|
|
return []byte(strings.Join(ret, "\n")), nil
|
|
}
|
|
|
|
var tunTestNum int64
|
|
|
|
func createTestTUN(t *testing.T) tun.Device {
|
|
const minimalMTU = 1280
|
|
tunName := fmt.Sprintf("tuntest%d", atomic.AddInt64(&tunTestNum, 1))
|
|
tun, err := tun.CreateTUN(tunName, minimalMTU)
|
|
if err != nil {
|
|
t.Fatalf("CreateTUN(%q): %v", tunName, err)
|
|
}
|
|
return tun
|
|
}
|
|
|
|
func TestDelRouteIdempotent(t *testing.T) {
|
|
if os.Getuid() != 0 {
|
|
t.Skip("test requires root")
|
|
}
|
|
tun := createTestTUN(t)
|
|
defer tun.Close()
|
|
|
|
var logOutput bytes.Buffer
|
|
logf := func(format string, args ...interface{}) {
|
|
fmt.Fprintf(&logOutput, format, args...)
|
|
if !bytes.HasSuffix(logOutput.Bytes(), []byte("\n")) {
|
|
logOutput.WriteByte('\n')
|
|
}
|
|
}
|
|
|
|
mon, err := monitor.New(logger.Discard)
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
mon.Start()
|
|
defer mon.Close()
|
|
|
|
r, err := newUserspaceRouter(logf, tun, mon)
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
lr := r.(*linuxRouter)
|
|
if err := lr.upInterface(); err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
for _, s := range []string{
|
|
"192.0.2.0/24", // RFC 5737
|
|
"2001:DB8::/32", // RFC 3849
|
|
} {
|
|
cidr := netaddr.MustParseIPPrefix(s)
|
|
if err := lr.addRoute(cidr); err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
for i := 0; i < 2; i++ {
|
|
if err := lr.delRoute(cidr); err != nil {
|
|
t.Fatalf("delRoute(i=%d): %v", i, err)
|
|
}
|
|
}
|
|
}
|
|
|
|
wantSubs := map[string]int{
|
|
"warning: tried to delete route 192.0.2.0/24 but it was already gone; ignoring error": 1,
|
|
"warning: tried to delete route 2001:db8::/32 but it was already gone; ignoring error": 1,
|
|
}
|
|
out := logOutput.String()
|
|
for sub, want := range wantSubs {
|
|
got := strings.Count(out, sub)
|
|
if got != want {
|
|
t.Errorf("log output substring %q occurred %d time; want %d", sub, got, want)
|
|
}
|
|
}
|
|
if t.Failed() {
|
|
t.Logf("Log output:\n%s", out)
|
|
}
|
|
}
|