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Pull request: Migrate to netip.Addr vol.1

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Merge in DNS/adguard-home from 2926-lla-v6 to master

Updates #2926.
Updates #5035.

Squashed commit of the following:

commit 2e770d4b6d4e1ec3f7762f2f2466662983bf146c
Merge: 25c1afc5 893358ea
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Fri Oct 14 15:14:56 2022 +0300

    Merge branch 'master' into 2926-lla-v6

commit 25c1afc5f0a5027fafac9dee77618886aefee29c
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Thu Oct 13 18:24:20 2022 +0300

    all: imp code, docs

commit 59549c4f74ee17b10eae542d1f1828d4e59894c9
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Tue Oct 11 18:49:09 2022 +0300

    dhcpd: use netip initially

commit 1af623096b0517d07752385540f2f750f7f5b3bb
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Fri Sep 30 18:03:52 2022 +0300

    all: imp docs, code

commit e9faeb71dbc0e887b25a7f3d5b33a401805f2ae7
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Thu Sep 29 14:56:37 2022 +0300

    all: use netip for web

commit 38305e555a6884c3bd1b0839330b942ce0e59093
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Wed Sep 28 19:13:58 2022 +0300

    add basic lla
This commit is contained in:
Eugene Burkov
2022-10-14 15:29:44 +03:00
parent 893358ea71
commit 4582b1c919
29 changed files with 465 additions and 367 deletions
Download Patch File Download Diff File Expand all files Collapse all files

165
internal/aghnet/net.go
View File

@@ -7,12 +7,12 @@ import (
"fmt"
"io"
"net"
"net/netip"
"syscall"
"github.com/AdguardTeam/AdGuardHome/internal/aghos"
"github.com/AdguardTeam/golibs/errors"
"github.com/AdguardTeam/golibs/log"
"github.com/AdguardTeam/golibs/netutil"
)
// Variables and functions to substitute in tests.
@@ -31,6 +31,12 @@ var (
// the IP being static is available.
const ErrNoStaticIPInfo errors.Error = "no information about static ip"
// IPv4Localhost returns 127.0.0.1, which returns true for [netip.Addr.Is4].
func IPv4Localhost() (ip netip.Addr) { return netip.AddrFrom4([4]byte{127, 0, 0, 1}) }
// IPv6Localhost returns ::1, which returns true for [netip.Addr.Is6].
func IPv6Localhost() (ip netip.Addr) { return netip.AddrFrom16([16]byte{15: 1}) }
// IfaceHasStaticIP checks if interface is configured to have static IP address.
// If it can't give a definitive answer, it returns false and an error for which
// errors.Is(err, ErrNoStaticIPInfo) is true.
@@ -47,26 +53,31 @@ func IfaceSetStaticIP(ifaceName string) (err error) {
//
// TODO(e.burkov): Investigate if the gateway address may be fetched in another
// way since not every machine has the software installed.
func GatewayIP(ifaceName string) (ip net.IP) {
func GatewayIP(ifaceName string) (ip netip.Addr) {
code, out, err := aghosRunCommand("ip", "route", "show", "dev", ifaceName)
if err != nil {
log.Debug("%s", err)
return nil
return netip.Addr{}
} else if code != 0 {
log.Debug("fetching gateway ip: unexpected exit code: %d", code)
return nil
return netip.Addr{}
}
fields := bytes.Fields(out)
// The meaningful "ip route" command output should contain the word
// "default" at first field and default gateway IP address at third field.
if len(fields) < 3 || string(fields[0]) != "default" {
return nil
return netip.Addr{}
}
return net.ParseIP(string(fields[2]))
ip, err = netip.ParseAddr(string(fields[2]))
if err != nil {
return netip.Addr{}
}
return ip
}
// CanBindPrivilegedPorts checks if current process can bind to privileged
@@ -78,9 +89,9 @@ func CanBindPrivilegedPorts() (can bool, err error) {
// NetInterface represents an entry of network interfaces map.
type NetInterface struct {
// Addresses are the network interface addresses.
Addresses []net.IP `json:"ip_addresses,omitempty"`
Addresses []netip.Addr `json:"ip_addresses,omitempty"`
// Subnets are the IP networks for this network interface.
Subnets []*net.IPNet `json:"-"`
Subnets []netip.Prefix `json:"-"`
Name string `json:"name"`
HardwareAddr net.HardwareAddr `json:"hardware_address"`
Flags net.Flags `json:"flags"`
@@ -101,57 +112,79 @@ func (iface NetInterface) MarshalJSON() ([]byte, error) {
})
}
func NetInterfaceFrom(iface *net.Interface) (niface *NetInterface, err error) {
niface = &NetInterface{
Name: iface.Name,
HardwareAddr: iface.HardwareAddr,
Flags: iface.Flags,
MTU: iface.MTU,
}
addrs, err := iface.Addrs()
if err != nil {
return nil, fmt.Errorf("failed to get addresses for interface %s: %w", iface.Name, err)
}
// Collect network interface addresses.
for _, addr := range addrs {
n, ok := addr.(*net.IPNet)
if !ok {
// Should be *net.IPNet, this is weird.
return nil, fmt.Errorf("expected %[2]s to be %[1]T, got %[2]T", n, addr)
} else if ip4 := n.IP.To4(); ip4 != nil {
n.IP = ip4
}
ip, ok := netip.AddrFromSlice(n.IP)
if !ok {
return nil, fmt.Errorf("bad address %s", n.IP)
}
ip = ip.Unmap()
if ip.IsLinkLocalUnicast() {
// Ignore link-local IPv4.
if ip.Is4() {
continue
}
ip = ip.WithZone(iface.Name)
}
ones, _ := n.Mask.Size()
p := netip.PrefixFrom(ip, ones)
niface.Addresses = append(niface.Addresses, ip)
niface.Subnets = append(niface.Subnets, p)
}
return niface, nil
}
// GetValidNetInterfacesForWeb returns interfaces that are eligible for DNS and
// WEB only we do not return link-local addresses here.
//
// TODO(e.burkov): Can't properly test the function since it's nontrivial to
// substitute net.Interface.Addrs and the net.InterfaceAddrs can't be used.
func GetValidNetInterfacesForWeb() (netIfaces []*NetInterface, err error) {
func GetValidNetInterfacesForWeb() (nifaces []*NetInterface, err error) {
ifaces, err := net.Interfaces()
if err != nil {
return nil, fmt.Errorf("couldn't get interfaces: %w", err)
return nil, fmt.Errorf("getting interfaces: %w", err)
} else if len(ifaces) == 0 {
return nil, errors.Error("couldn't find any legible interface")
return nil, errors.Error("no legible interfaces")
}
for _, iface := range ifaces {
var addrs []net.Addr
addrs, err = iface.Addrs()
for i := range ifaces {
var niface *NetInterface
niface, err = NetInterfaceFrom(&ifaces[i])
if err != nil {
return nil, fmt.Errorf("failed to get addresses for interface %s: %w", iface.Name, err)
}
netIface := &NetInterface{
MTU: iface.MTU,
Name: iface.Name,
HardwareAddr: iface.HardwareAddr,
Flags: iface.Flags,
}
// Collect network interface addresses.
for _, addr := range addrs {
ipNet, ok := addr.(*net.IPNet)
if !ok {
// Should be net.IPNet, this is weird.
return nil, fmt.Errorf("got %s that is not net.IPNet, it is %T", addr, addr)
}
// Ignore link-local.
if ipNet.IP.IsLinkLocalUnicast() {
continue
}
netIface.Addresses = append(netIface.Addresses, ipNet.IP)
netIface.Subnets = append(netIface.Subnets, ipNet)
}
// Discard interfaces with no addresses.
if len(netIface.Addresses) != 0 {
netIfaces = append(netIfaces, netIface)
return nil, err
} else if len(niface.Addresses) != 0 {
// Discard interfaces with no addresses.
nifaces = append(nifaces, niface)
}
}
return netIfaces, nil
return nifaces, nil
}
// InterfaceByIP returns the name of the interface bound to ip.
@@ -160,7 +193,7 @@ func GetValidNetInterfacesForWeb() (netIfaces []*NetInterface, err error) {
// IP address can be shared by multiple interfaces in some configurations.
//
// TODO(e.burkov): See TODO on GetValidNetInterfacesForWeb.
func InterfaceByIP(ip net.IP) (ifaceName string) {
func InterfaceByIP(ip netip.Addr) (ifaceName string) {
ifaces, err := GetValidNetInterfacesForWeb()
if err != nil {
return ""
@@ -168,7 +201,7 @@ func InterfaceByIP(ip net.IP) (ifaceName string) {
for _, iface := range ifaces {
for _, addr := range iface.Addresses {
if ip.Equal(addr) {
if ip == addr {
return iface.Name
}
}
@@ -177,15 +210,16 @@ func InterfaceByIP(ip net.IP) (ifaceName string) {
return ""
}
// GetSubnet returns pointer to net.IPNet for the specified interface or nil if
// GetSubnet returns the subnet corresponding to the interface of zero prefix if
// the search fails.
//
// TODO(e.burkov): See TODO on GetValidNetInterfacesForWeb.
func GetSubnet(ifaceName string) *net.IPNet {
func GetSubnet(ifaceName string) (p netip.Prefix) {
netIfaces, err := GetValidNetInterfacesForWeb()
if err != nil {
log.Error("Could not get network interfaces info: %v", err)
return nil
return p
}
for _, netIface := range netIfaces {
@@ -194,14 +228,14 @@ func GetSubnet(ifaceName string) *net.IPNet {
}
}
return nil
return p
}
// CheckPort checks if the port is available for binding. network is expected
// to be one of "udp" and "tcp".
func CheckPort(network string, ip net.IP, port int) (err error) {
func CheckPort(network string, ipp netip.AddrPort) (err error) {
var c io.Closer
addr := netutil.IPPort{IP: ip, Port: port}.String()
addr := ipp.String()
switch network {
case "tcp":
c, err = net.Listen(network, addr)
@@ -251,18 +285,23 @@ func CollectAllIfacesAddrs() (addrs []string, err error) {
return addrs, nil
}
// BroadcastFromIPNet calculates the broadcast IP address for n.
func BroadcastFromIPNet(n *net.IPNet) (dc net.IP) {
dc = netutil.CloneIP(n.IP)
mask := n.Mask
if mask == nil {
mask = dc.DefaultMask()
// BroadcastFromPref calculates the broadcast IP address for p.
func BroadcastFromPref(p netip.Prefix) (bc netip.Addr) {
bc = p.Addr().Unmap()
if !bc.IsValid() {
return netip.Addr{}
}
for i, b := range mask {
dc[i] |= ^b
maskLen, addrLen := p.Bits(), bc.BitLen()
if maskLen == addrLen {
return bc
}
return dc
ipBytes := bc.AsSlice()
for i := maskLen; i < addrLen; i++ {
ipBytes[i/8] |= 1 << (7 - (i % 8))
}
bc, _ = netip.AddrFromSlice(ipBytes)
return bc
}