611 lines
15 KiB
Go
611 lines
15 KiB
Go
//go:build aix || darwin || dragonfly || freebsd || linux || netbsd || openbsd || solaris
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// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris
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package dhcpd
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import (
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"fmt"
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"net"
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"strings"
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"testing"
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"github.com/AdguardTeam/golibs/stringutil"
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"github.com/AdguardTeam/golibs/testutil"
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"github.com/insomniacslk/dhcp/dhcpv4"
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"github.com/stretchr/testify/assert"
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"github.com/stretchr/testify/require"
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//lint:ignore SA1019 See the TODO in go.mod.
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"github.com/mdlayher/raw"
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)
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var (
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DefaultRangeStart = net.IP{192, 168, 10, 100}
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DefaultRangeEnd = net.IP{192, 168, 10, 200}
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DefaultGatewayIP = net.IP{192, 168, 10, 1}
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DefaultSubnetMask = net.IP{255, 255, 255, 0}
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)
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func notify4(flags uint32) {
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}
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// defaultV4ServerConf returns the default configuration for *v4Server to use in
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// tests.
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func defaultV4ServerConf() (conf V4ServerConf) {
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return V4ServerConf{
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Enabled: true,
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RangeStart: DefaultRangeStart,
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RangeEnd: DefaultRangeEnd,
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GatewayIP: DefaultGatewayIP,
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SubnetMask: DefaultSubnetMask,
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notify: notify4,
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}
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}
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// defaultSrv prepares the default DHCPServer to use in tests. The underlying
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// type of s is *v4Server.
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func defaultSrv(t *testing.T) (s DHCPServer) {
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t.Helper()
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var err error
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s, err = v4Create(defaultV4ServerConf())
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require.NoError(t, err)
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return s
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}
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func TestV4Server_AddRemove_static(t *testing.T) {
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s := defaultSrv(t)
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ls := s.GetLeases(LeasesStatic)
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require.Empty(t, ls)
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testCases := []struct {
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lease *Lease
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name string
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wantErrMsg string
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}{{
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lease: &Lease{
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Hostname: "success.local",
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HWAddr: net.HardwareAddr{0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA},
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IP: net.IP{192, 168, 10, 150},
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},
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name: "success",
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wantErrMsg: "",
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}, {
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lease: &Lease{
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Hostname: "probably-router.local",
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HWAddr: net.HardwareAddr{0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA},
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IP: DefaultGatewayIP,
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},
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name: "with_gateway_ip",
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wantErrMsg: "dhcpv4: adding static lease: " +
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"can't assign the gateway IP 192.168.10.1 to the lease",
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}, {
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lease: &Lease{
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Hostname: "ip6.local",
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HWAddr: net.HardwareAddr{0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA},
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IP: net.ParseIP("ffff::1"),
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},
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name: "ipv6",
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wantErrMsg: `dhcpv4: adding static lease: ` +
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`invalid ip "ffff::1", only ipv4 is supported`,
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}, {
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lease: &Lease{
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Hostname: "bad-mac.local",
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HWAddr: net.HardwareAddr{0xAA, 0xAA},
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IP: net.IP{192, 168, 10, 150},
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},
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name: "bad_mac",
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wantErrMsg: `dhcpv4: adding static lease: bad mac address "aa:aa": ` +
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`bad mac address length 2, allowed: [6 8 20]`,
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}, {
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lease: &Lease{
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Hostname: "bad-lbl-.local",
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HWAddr: net.HardwareAddr{0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA},
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IP: net.IP{192, 168, 10, 150},
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},
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name: "bad_hostname",
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wantErrMsg: `dhcpv4: adding static lease: validating hostname: ` +
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`bad domain name "bad-lbl-.local": ` +
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`bad domain name label "bad-lbl-": bad domain name label rune '-'`,
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}}
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for _, tc := range testCases {
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t.Run(tc.name, func(t *testing.T) {
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err := s.AddStaticLease(tc.lease)
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testutil.AssertErrorMsg(t, tc.wantErrMsg, err)
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if tc.wantErrMsg != "" {
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return
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}
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err = s.RemoveStaticLease(&Lease{
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IP: tc.lease.IP,
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HWAddr: tc.lease.HWAddr,
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})
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diffErrMsg := fmt.Sprintf("dhcpv4: lease for ip %s is different: %+v", tc.lease.IP, tc.lease)
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testutil.AssertErrorMsg(t, diffErrMsg, err)
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// Remove static lease.
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err = s.RemoveStaticLease(tc.lease)
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require.NoError(t, err)
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})
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ls = s.GetLeases(LeasesStatic)
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require.Emptyf(t, ls, "after %s", tc.name)
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}
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}
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func TestV4_AddReplace(t *testing.T) {
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sIface := defaultSrv(t)
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s, ok := sIface.(*v4Server)
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require.True(t, ok)
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dynLeases := []Lease{{
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Hostname: "dynamic-1.local",
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HWAddr: net.HardwareAddr{0x11, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA},
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IP: net.IP{192, 168, 10, 150},
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}, {
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Hostname: "dynamic-2.local",
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HWAddr: net.HardwareAddr{0x22, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA},
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IP: net.IP{192, 168, 10, 151},
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}}
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for i := range dynLeases {
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err := s.addLease(&dynLeases[i])
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require.NoError(t, err)
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}
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stLeases := []*Lease{{
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Hostname: "static-1.local",
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HWAddr: net.HardwareAddr{0x33, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA},
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IP: net.IP{192, 168, 10, 150},
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}, {
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Hostname: "static-2.local",
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HWAddr: net.HardwareAddr{0x22, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA},
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IP: net.IP{192, 168, 10, 152},
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}}
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for _, l := range stLeases {
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err := s.AddStaticLease(l)
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require.NoError(t, err)
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}
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ls := s.GetLeases(LeasesStatic)
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require.Len(t, ls, 2)
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for i, l := range ls {
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assert.True(t, stLeases[i].IP.Equal(l.IP))
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assert.Equal(t, stLeases[i].HWAddr, l.HWAddr)
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assert.True(t, l.IsStatic())
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}
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}
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func TestV4Server_Process_optionsPriority(t *testing.T) {
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defaultIP := net.IP{192, 168, 1, 1}
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knownIP := net.IP{1, 2, 3, 4}
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// prepareSrv creates a *v4Server and sets the opt6IPs in the initial
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// configuration of the server as the value for DHCP option 6.
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prepareSrv := func(t *testing.T, opt6IPs []net.IP) (s *v4Server) {
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t.Helper()
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conf := defaultV4ServerConf()
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if len(opt6IPs) > 0 {
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b := &strings.Builder{}
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stringutil.WriteToBuilder(b, "6 ips ", opt6IPs[0].String())
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for _, ip := range opt6IPs[1:] {
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stringutil.WriteToBuilder(b, ",", ip.String())
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}
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conf.Options = []string{b.String()}
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}
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ss, err := v4Create(conf)
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require.NoError(t, err)
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var ok bool
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s, ok = ss.(*v4Server)
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require.True(t, ok)
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s.conf.dnsIPAddrs = []net.IP{defaultIP}
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return s
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}
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// checkResp creates a discovery message with DHCP option 6 requested amd
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// asserts the response to contain wantIPs in this option.
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checkResp := func(t *testing.T, s *v4Server, wantIPs []net.IP) {
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t.Helper()
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mac := net.HardwareAddr{0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA}
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req, err := dhcpv4.NewDiscovery(mac, dhcpv4.WithRequestedOptions(
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dhcpv4.OptionDomainNameServer,
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))
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require.NoError(t, err)
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var resp *dhcpv4.DHCPv4
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resp, err = dhcpv4.NewReplyFromRequest(req)
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require.NoError(t, err)
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res := s.process(req, resp)
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require.Equal(t, 1, res)
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o := resp.GetOneOption(dhcpv4.OptionDomainNameServer)
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require.NotEmpty(t, o)
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wantData := []byte{}
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for _, ip := range wantIPs {
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wantData = append(wantData, ip...)
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}
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assert.Equal(t, o, wantData)
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}
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t.Run("default", func(t *testing.T) {
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s := prepareSrv(t, nil)
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checkResp(t, s, []net.IP{defaultIP})
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})
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t.Run("explicitly_configured", func(t *testing.T) {
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s := prepareSrv(t, []net.IP{knownIP, knownIP})
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checkResp(t, s, []net.IP{knownIP, knownIP})
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})
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}
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func TestV4StaticLease_Get(t *testing.T) {
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sIface := defaultSrv(t)
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s, ok := sIface.(*v4Server)
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require.True(t, ok)
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s.conf.dnsIPAddrs = []net.IP{{192, 168, 10, 1}}
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l := &Lease{
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Hostname: "static-1.local",
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HWAddr: net.HardwareAddr{0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA},
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IP: net.IP{192, 168, 10, 150},
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}
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err := s.AddStaticLease(l)
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require.NoError(t, err)
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var req, resp *dhcpv4.DHCPv4
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mac := net.HardwareAddr{0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA}
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t.Run("discover", func(t *testing.T) {
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req, err = dhcpv4.NewDiscovery(mac, dhcpv4.WithRequestedOptions(
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dhcpv4.OptionDomainNameServer,
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))
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require.NoError(t, err)
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resp, err = dhcpv4.NewReplyFromRequest(req)
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require.NoError(t, err)
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assert.Equal(t, 1, s.process(req, resp))
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})
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// Don't continue if we got any errors in the previous subtest.
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require.NoError(t, err)
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t.Run("offer", func(t *testing.T) {
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assert.Equal(t, dhcpv4.MessageTypeOffer, resp.MessageType())
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assert.Equal(t, mac, resp.ClientHWAddr)
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assert.True(t, l.IP.Equal(resp.YourIPAddr))
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assert.True(t, s.conf.GatewayIP.Equal(resp.Router()[0]))
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assert.True(t, s.conf.GatewayIP.Equal(resp.ServerIdentifier()))
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assert.Equal(t, s.conf.subnet.Mask, resp.SubnetMask())
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assert.Equal(t, s.conf.leaseTime.Seconds(), resp.IPAddressLeaseTime(-1).Seconds())
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})
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t.Run("request", func(t *testing.T) {
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req, err = dhcpv4.NewRequestFromOffer(resp)
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require.NoError(t, err)
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resp, err = dhcpv4.NewReplyFromRequest(req)
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require.NoError(t, err)
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assert.Equal(t, 1, s.process(req, resp))
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})
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require.NoError(t, err)
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t.Run("ack", func(t *testing.T) {
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assert.Equal(t, dhcpv4.MessageTypeAck, resp.MessageType())
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assert.Equal(t, mac, resp.ClientHWAddr)
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assert.True(t, l.IP.Equal(resp.YourIPAddr))
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assert.True(t, s.conf.GatewayIP.Equal(resp.Router()[0]))
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assert.True(t, s.conf.GatewayIP.Equal(resp.ServerIdentifier()))
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assert.Equal(t, s.conf.subnet.Mask, resp.SubnetMask())
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assert.Equal(t, s.conf.leaseTime.Seconds(), resp.IPAddressLeaseTime(-1).Seconds())
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})
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dnsAddrs := resp.DNS()
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require.Len(t, dnsAddrs, 1)
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assert.True(t, s.conf.GatewayIP.Equal(dnsAddrs[0]))
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t.Run("check_lease", func(t *testing.T) {
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ls := s.GetLeases(LeasesStatic)
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require.Len(t, ls, 1)
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assert.True(t, l.IP.Equal(ls[0].IP))
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assert.Equal(t, mac, ls[0].HWAddr)
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})
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}
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func TestV4DynamicLease_Get(t *testing.T) {
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conf := defaultV4ServerConf()
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conf.Options = []string{
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"81 hex 303132",
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"82 ip 1.2.3.4",
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}
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var err error
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sIface, err := v4Create(conf)
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require.NoError(t, err)
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s, ok := sIface.(*v4Server)
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require.True(t, ok)
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s.conf.dnsIPAddrs = []net.IP{{192, 168, 10, 1}}
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var req, resp *dhcpv4.DHCPv4
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mac := net.HardwareAddr{0xAA, 0xAA, 0xAA, 0xAA, 0xAA, 0xAA}
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t.Run("discover", func(t *testing.T) {
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req, err = dhcpv4.NewDiscovery(mac, dhcpv4.WithRequestedOptions(
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dhcpv4.OptionFQDN,
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dhcpv4.OptionRelayAgentInformation,
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))
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require.NoError(t, err)
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resp, err = dhcpv4.NewReplyFromRequest(req)
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require.NoError(t, err)
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assert.Equal(t, 1, s.process(req, resp))
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})
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// Don't continue if we got any errors in the previous subtest.
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require.NoError(t, err)
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t.Run("offer", func(t *testing.T) {
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assert.Equal(t, dhcpv4.MessageTypeOffer, resp.MessageType())
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assert.Equal(t, mac, resp.ClientHWAddr)
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assert.Equal(t, s.conf.RangeStart, resp.YourIPAddr)
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assert.Equal(t, s.conf.GatewayIP, resp.ServerIdentifier())
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router := resp.Router()
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require.Len(t, router, 1)
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assert.Equal(t, s.conf.GatewayIP, router[0])
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assert.Equal(t, s.conf.subnet.Mask, resp.SubnetMask())
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assert.Equal(t, s.conf.leaseTime.Seconds(), resp.IPAddressLeaseTime(-1).Seconds())
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assert.Equal(t, []byte("012"), resp.Options.Get(dhcpv4.OptionFQDN))
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rai := resp.RelayAgentInfo()
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require.NotNil(t, rai)
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assert.Equal(t, net.IP{1, 2, 3, 4}, net.IP(rai.ToBytes()))
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})
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t.Run("request", func(t *testing.T) {
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req, err = dhcpv4.NewRequestFromOffer(resp)
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require.NoError(t, err)
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resp, err = dhcpv4.NewReplyFromRequest(req)
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require.NoError(t, err)
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assert.Equal(t, 1, s.process(req, resp))
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})
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require.NoError(t, err)
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t.Run("ack", func(t *testing.T) {
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assert.Equal(t, dhcpv4.MessageTypeAck, resp.MessageType())
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assert.Equal(t, mac, resp.ClientHWAddr)
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assert.True(t, s.conf.RangeStart.Equal(resp.YourIPAddr))
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router := resp.Router()
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require.Len(t, router, 1)
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assert.Equal(t, s.conf.GatewayIP, router[0])
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assert.True(t, s.conf.GatewayIP.Equal(resp.ServerIdentifier()))
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assert.Equal(t, s.conf.subnet.Mask, resp.SubnetMask())
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assert.Equal(t, s.conf.leaseTime.Seconds(), resp.IPAddressLeaseTime(-1).Seconds())
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})
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dnsAddrs := resp.DNS()
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require.Len(t, dnsAddrs, 1)
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assert.True(t, net.IP{192, 168, 10, 1}.Equal(dnsAddrs[0]))
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// check lease
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t.Run("check_lease", func(t *testing.T) {
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ls := s.GetLeases(LeasesDynamic)
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require.Len(t, ls, 1)
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assert.True(t, net.IP{192, 168, 10, 100}.Equal(ls[0].IP))
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assert.Equal(t, mac, ls[0].HWAddr)
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})
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}
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func TestNormalizeHostname(t *testing.T) {
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testCases := []struct {
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name string
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hostname string
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wantErrMsg string
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want string
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}{{
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name: "success",
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hostname: "example.com",
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wantErrMsg: "",
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want: "example.com",
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}, {
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name: "success_empty",
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hostname: "",
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wantErrMsg: "",
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want: "",
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}, {
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name: "success_spaces",
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hostname: "my device 01",
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wantErrMsg: "",
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want: "my-device-01",
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}, {
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name: "success_underscores",
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hostname: "my_device_01",
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wantErrMsg: "",
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want: "my-device-01",
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}, {
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name: "error_part",
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hostname: "device !!!",
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wantErrMsg: "",
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want: "device",
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}, {
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name: "error_part_spaces",
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hostname: "device ! ! !",
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wantErrMsg: "",
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want: "device",
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}, {
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name: "error",
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hostname: "!!!",
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wantErrMsg: `normalizing "!!!": no valid parts`,
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want: "",
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}, {
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name: "error_spaces",
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hostname: "! ! !",
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wantErrMsg: `normalizing "! ! !": no valid parts`,
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want: "",
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}}
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for _, tc := range testCases {
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t.Run(tc.name, func(t *testing.T) {
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got, err := normalizeHostname(tc.hostname)
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testutil.AssertErrorMsg(t, tc.wantErrMsg, err)
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assert.Equal(t, tc.want, got)
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})
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}
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}
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// fakePacketConn is a mock implementation of net.PacketConn to simplify
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// testing.
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type fakePacketConn struct {
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// writeTo is used to substitute net.PacketConn's WriteTo method.
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writeTo func(p []byte, addr net.Addr) (n int, err error)
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// net.PacketConn is embedded here simply to make *fakePacketConn a
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// net.PacketConn without actually implementing all methods.
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net.PacketConn
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}
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// WriteTo implements net.PacketConn interface for *fakePacketConn.
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func (fc *fakePacketConn) WriteTo(p []byte, addr net.Addr) (n int, err error) {
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return fc.writeTo(p, addr)
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}
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func TestV4Server_Send(t *testing.T) {
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s := &v4Server{}
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var (
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defaultIP = net.IP{99, 99, 99, 99}
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knownIP = net.IP{4, 2, 4, 2}
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knownMAC = net.HardwareAddr{6, 5, 4, 3, 2, 1}
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)
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defaultPeer := &net.UDPAddr{
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IP: defaultIP,
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// Use neither client nor server port to check it actually
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// changed.
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Port: dhcpv4.ClientPort + dhcpv4.ServerPort,
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}
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defaultResp := &dhcpv4.DHCPv4{}
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testCases := []struct {
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want net.Addr
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req *dhcpv4.DHCPv4
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resp *dhcpv4.DHCPv4
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name string
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}{{
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name: "giaddr",
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req: &dhcpv4.DHCPv4{GatewayIPAddr: knownIP},
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resp: defaultResp,
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want: &net.UDPAddr{
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IP: knownIP,
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Port: dhcpv4.ServerPort,
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},
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}, {
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name: "nak",
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req: &dhcpv4.DHCPv4{},
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resp: &dhcpv4.DHCPv4{
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Options: dhcpv4.OptionsFromList(
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dhcpv4.OptMessageType(dhcpv4.MessageTypeNak),
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),
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},
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want: defaultPeer,
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}, {
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name: "ciaddr",
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req: &dhcpv4.DHCPv4{ClientIPAddr: knownIP},
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resp: &dhcpv4.DHCPv4{},
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want: &net.UDPAddr{
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IP: knownIP,
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Port: dhcpv4.ClientPort,
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},
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}, {
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name: "chaddr",
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req: &dhcpv4.DHCPv4{ClientHWAddr: knownMAC},
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resp: &dhcpv4.DHCPv4{YourIPAddr: knownIP},
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want: &dhcpUnicastAddr{
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Addr: raw.Addr{HardwareAddr: knownMAC},
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yiaddr: knownIP,
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},
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}, {
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name: "who_are_you",
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req: &dhcpv4.DHCPv4{},
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resp: &dhcpv4.DHCPv4{},
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want: defaultPeer,
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}}
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for _, tc := range testCases {
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t.Run(tc.name, func(t *testing.T) {
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conn := &fakePacketConn{
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writeTo: func(_ []byte, addr net.Addr) (_ int, _ error) {
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assert.Equal(t, tc.want, addr)
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return 0, nil
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},
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}
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s.send(cloneUDPAddr(defaultPeer), conn, tc.req, tc.resp)
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})
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}
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t.Run("giaddr_nak", func(t *testing.T) {
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req := &dhcpv4.DHCPv4{
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GatewayIPAddr: knownIP,
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}
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// Ensure the request is for unicast.
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req.SetUnicast()
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resp := &dhcpv4.DHCPv4{
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Options: dhcpv4.OptionsFromList(
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dhcpv4.OptMessageType(dhcpv4.MessageTypeNak),
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),
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}
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want := &net.UDPAddr{
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IP: req.GatewayIPAddr,
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Port: dhcpv4.ServerPort,
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}
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conn := &fakePacketConn{
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writeTo: func(_ []byte, addr net.Addr) (n int, err error) {
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assert.Equal(t, want, addr)
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return 0, nil
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},
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}
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s.send(cloneUDPAddr(defaultPeer), conn, req, resp)
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assert.True(t, resp.IsBroadcast())
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})
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}
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