AdGuardHome/internal/aghnet/net_test.go

349 lines
8.5 KiB
Go

package aghnet
import (
"bytes"
"encoding/json"
"fmt"
"io/fs"
"net"
"os"
"strings"
"testing"
"github.com/AdguardTeam/AdGuardHome/internal/aghtest"
"github.com/AdguardTeam/golibs/errors"
"github.com/AdguardTeam/golibs/netutil"
"github.com/AdguardTeam/golibs/testutil"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
func TestMain(m *testing.M) {
aghtest.DiscardLogOutput(m)
}
// testdata is the filesystem containing data for testing the package.
var testdata fs.FS = os.DirFS("./testdata")
// substRootDirFS replaces the aghos.RootDirFS function used throughout the
// package with fsys for tests ran under t.
func substRootDirFS(t testing.TB, fsys fs.FS) {
t.Helper()
prev := rootDirFS
t.Cleanup(func() { rootDirFS = prev })
rootDirFS = fsys
}
// RunCmdFunc is the signature of aghos.RunCommand function.
type RunCmdFunc func(cmd string, args ...string) (code int, out []byte, err error)
// substShell replaces the the aghos.RunCommand function used throughout the
// package with rc for tests ran under t.
func substShell(t testing.TB, rc RunCmdFunc) {
t.Helper()
prev := aghosRunCommand
t.Cleanup(func() { aghosRunCommand = prev })
aghosRunCommand = rc
}
// mapShell is a substitution of aghos.RunCommand that maps the command to it's
// execution result. It's only needed to simplify testing.
//
// TODO(e.burkov): Perhaps put all the shell interactions behind an interface.
type mapShell map[string]struct {
err error
out string
code int
}
// theOnlyCmd returns mapShell that only handles a single command and arguments
// combination from cmd.
func theOnlyCmd(cmd string, code int, out string, err error) (s mapShell) {
return mapShell{cmd: {code: code, out: out, err: err}}
}
// RunCmd is a RunCmdFunc handled by s.
func (s mapShell) RunCmd(cmd string, args ...string) (code int, out []byte, err error) {
key := strings.Join(append([]string{cmd}, args...), " ")
ret, ok := s[key]
if !ok {
return 0, nil, fmt.Errorf("unexpected shell command %q", key)
}
return ret.code, []byte(ret.out), ret.err
}
// ifaceAddrsFunc is the signature of net.InterfaceAddrs function.
type ifaceAddrsFunc func() (ifaces []net.Addr, err error)
// substNetInterfaceAddrs replaces the the net.InterfaceAddrs function used
// throughout the package with f for tests ran under t.
func substNetInterfaceAddrs(t *testing.T, f ifaceAddrsFunc) {
t.Helper()
prev := netInterfaceAddrs
t.Cleanup(func() { netInterfaceAddrs = prev })
netInterfaceAddrs = f
}
func TestGatewayIP(t *testing.T) {
const ifaceName = "ifaceName"
const cmd = "ip route show dev " + ifaceName
testCases := []struct {
name string
shell mapShell
want net.IP
}{{
name: "success_v4",
shell: theOnlyCmd(cmd, 0, `default via 1.2.3.4 onlink`, nil),
want: net.IP{1, 2, 3, 4}.To16(),
}, {
name: "success_v6",
shell: theOnlyCmd(cmd, 0, `default via ::ffff onlink`, nil),
want: net.IP{
0x0, 0x0, 0x0, 0x0,
0x0, 0x0, 0x0, 0x0,
0x0, 0x0, 0x0, 0x0,
0x0, 0x0, 0xFF, 0xFF,
},
}, {
name: "bad_output",
shell: theOnlyCmd(cmd, 0, `non-default via 1.2.3.4 onlink`, nil),
want: nil,
}, {
name: "err_runcmd",
shell: theOnlyCmd(cmd, 0, "", errors.Error("can't run command")),
want: nil,
}, {
name: "bad_code",
shell: theOnlyCmd(cmd, 1, "", nil),
want: nil,
}}
for _, tc := range testCases {
t.Run(tc.name, func(t *testing.T) {
substShell(t, tc.shell.RunCmd)
assert.Equal(t, tc.want, GatewayIP(ifaceName))
})
}
}
func TestInterfaceByIP(t *testing.T) {
ifaces, err := GetValidNetInterfacesForWeb()
require.NoError(t, err)
require.NotEmpty(t, ifaces)
for _, iface := range ifaces {
t.Run(iface.Name, func(t *testing.T) {
require.NotEmpty(t, iface.Addresses)
for _, ip := range iface.Addresses {
ifaceName := InterfaceByIP(ip)
require.Equal(t, iface.Name, ifaceName)
}
})
}
}
func TestBroadcastFromIPNet(t *testing.T) {
known6 := net.IP{
1, 2, 3, 4,
5, 6, 7, 8,
9, 10, 11, 12,
13, 14, 15, 16,
}
testCases := []struct {
name string
subnet *net.IPNet
want net.IP
}{{
name: "full",
subnet: &net.IPNet{
IP: net.IP{192, 168, 0, 1},
Mask: net.IPMask{255, 255, 15, 0},
},
want: net.IP{192, 168, 240, 255},
}, {
name: "ipv6_no_mask",
subnet: &net.IPNet{
IP: known6,
},
want: known6,
}, {
name: "ipv4_no_mask",
subnet: &net.IPNet{
IP: net.IP{192, 168, 1, 2},
},
want: net.IP{192, 168, 1, 255},
}, {
name: "unspecified",
subnet: &net.IPNet{
IP: net.IP{0, 0, 0, 0},
Mask: net.IPMask{0, 0, 0, 0},
},
want: net.IPv4bcast,
}}
for _, tc := range testCases {
t.Run(tc.name, func(t *testing.T) {
bc := BroadcastFromIPNet(tc.subnet)
assert.True(t, bc.Equal(tc.want), bc)
})
}
}
func TestCheckPort(t *testing.T) {
t.Run("tcp_bound", func(t *testing.T) {
l, err := net.Listen("tcp", "127.0.0.1:")
require.NoError(t, err)
testutil.CleanupAndRequireSuccess(t, l.Close)
ipp := netutil.IPPortFromAddr(l.Addr())
require.NotNil(t, ipp)
require.NotNil(t, ipp.IP)
require.NotZero(t, ipp.Port)
err = CheckPort("tcp", ipp.IP, ipp.Port)
target := &net.OpError{}
require.ErrorAs(t, err, &target)
assert.Equal(t, "listen", target.Op)
})
t.Run("udp_bound", func(t *testing.T) {
conn, err := net.ListenPacket("udp", "127.0.0.1:")
require.NoError(t, err)
testutil.CleanupAndRequireSuccess(t, conn.Close)
ipp := netutil.IPPortFromAddr(conn.LocalAddr())
require.NotNil(t, ipp)
require.NotNil(t, ipp.IP)
require.NotZero(t, ipp.Port)
err = CheckPort("udp", ipp.IP, ipp.Port)
target := &net.OpError{}
require.ErrorAs(t, err, &target)
assert.Equal(t, "listen", target.Op)
})
t.Run("bad_network", func(t *testing.T) {
err := CheckPort("bad_network", nil, 0)
assert.NoError(t, err)
})
t.Run("can_bind", func(t *testing.T) {
err := CheckPort("udp", net.IP{0, 0, 0, 0}, 0)
assert.NoError(t, err)
})
}
func TestCollectAllIfacesAddrs(t *testing.T) {
testCases := []struct {
name string
wantErrMsg string
addrs []net.Addr
wantAddrs []string
}{{
name: "success",
wantErrMsg: ``,
addrs: []net.Addr{&net.IPNet{
IP: net.IP{1, 2, 3, 4},
Mask: net.CIDRMask(24, netutil.IPv4BitLen),
}, &net.IPNet{
IP: net.IP{4, 3, 2, 1},
Mask: net.CIDRMask(16, netutil.IPv4BitLen),
}},
wantAddrs: []string{"1.2.3.4", "4.3.2.1"},
}, {
name: "not_cidr",
wantErrMsg: `parsing cidr: invalid CIDR address: 1.2.3.4`,
addrs: []net.Addr{&net.IPAddr{
IP: net.IP{1, 2, 3, 4},
}},
wantAddrs: nil,
}, {
name: "empty",
wantErrMsg: ``,
addrs: []net.Addr{},
wantAddrs: nil,
}}
for _, tc := range testCases {
t.Run(tc.name, func(t *testing.T) {
substNetInterfaceAddrs(t, func() ([]net.Addr, error) { return tc.addrs, nil })
addrs, err := CollectAllIfacesAddrs()
testutil.AssertErrorMsg(t, tc.wantErrMsg, err)
assert.Equal(t, tc.wantAddrs, addrs)
})
}
t.Run("internal_error", func(t *testing.T) {
const errAddrs errors.Error = "can't get addresses"
const wantErrMsg string = `getting interfaces addresses: ` + string(errAddrs)
substNetInterfaceAddrs(t, func() ([]net.Addr, error) { return nil, errAddrs })
_, err := CollectAllIfacesAddrs()
testutil.AssertErrorMsg(t, wantErrMsg, err)
})
}
func TestIsAddrInUse(t *testing.T) {
t.Run("addr_in_use", func(t *testing.T) {
l, err := net.Listen("tcp", "0.0.0.0:0")
require.NoError(t, err)
testutil.CleanupAndRequireSuccess(t, l.Close)
_, err = net.Listen(l.Addr().Network(), l.Addr().String())
assert.True(t, IsAddrInUse(err))
})
t.Run("another", func(t *testing.T) {
const anotherErr errors.Error = "not addr in use"
assert.False(t, IsAddrInUse(anotherErr))
})
}
func TestNetInterface_MarshalJSON(t *testing.T) {
const want = `{` +
`"hardware_address":"aa:bb:cc:dd:ee:ff",` +
`"flags":"up|multicast",` +
`"ip_addresses":["1.2.3.4","aaaa::1"],` +
`"name":"iface0",` +
`"mtu":1500` +
`}` + "\n"
ip4, ip6 := net.IP{1, 2, 3, 4}, net.IP{0xAA, 0xAA, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1}
mask4, mask6 := net.CIDRMask(24, netutil.IPv4BitLen), net.CIDRMask(8, netutil.IPv6BitLen)
iface := &NetInterface{
Addresses: []net.IP{ip4, ip6},
Subnets: []*net.IPNet{{
IP: ip4.Mask(mask4),
Mask: mask4,
}, {
IP: ip6.Mask(mask6),
Mask: mask6,
}},
Name: "iface0",
HardwareAddr: net.HardwareAddr{0xAA, 0xBB, 0xCC, 0xDD, 0xEE, 0xFF},
Flags: net.FlagUp | net.FlagMulticast,
MTU: 1500,
}
b := &bytes.Buffer{}
err := json.NewEncoder(b).Encode(iface)
require.NoError(t, err)
assert.Equal(t, want, b.String())
}