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https://github.com/AdguardTeam/AdGuardHome.git
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506b459842
Merge in DNS/adguard-home from 3225-bsd-dhcp to master Closes #3225. Closes #3417. Squashed commit of the following: commit e7ea691824c7ebc8cafd8c9e206679346cbc8592 Author: Eugene Burkov <e.burkov@adguard.com> Date: Thu Aug 12 17:02:02 2021 +0300 all: imp code, docs commit 5b598fc18a9b69a0256569f4c691bb6a2193dfbd Author: Eugene Burkov <e.burkov@adguard.com> Date: Thu Aug 12 16:28:12 2021 +0300 all: mv logic, imp code, docs, log changes commit e3e1577a668fe3e5c61d075c390e4bd7268181ba Author: Eugene Burkov <e.burkov@adguard.com> Date: Thu Aug 12 14:15:10 2021 +0300 dhcpd: imp checkother commit 3cc8b058195c30a7ef0b7741ee8463270d9e47ff Author: Eugene Burkov <e.burkov@adguard.com> Date: Wed Aug 11 13:20:18 2021 +0300 all: imp bsd support
118 lines
2.7 KiB
Go
118 lines
2.7 KiB
Go
package aghnet
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import (
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"fmt"
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"net"
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"time"
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"github.com/AdguardTeam/golibs/log"
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)
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// IPVersion is a documentational alias for int. Use it when the integer means
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// IP version.
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type IPVersion = int
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// IP version constants.
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const (
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IPVersion4 IPVersion = 4
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IPVersion6 IPVersion = 6
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)
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// NetIface is the interface for network interface methods.
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type NetIface interface {
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Addrs() ([]net.Addr, error)
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}
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// IfaceIPAddrs returns the interface's IP addresses.
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func IfaceIPAddrs(iface NetIface, ipv IPVersion) (ips []net.IP, err error) {
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addrs, err := iface.Addrs()
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if err != nil {
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return nil, err
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}
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for _, a := range addrs {
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var ip net.IP
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switch a := a.(type) {
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case *net.IPAddr:
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ip = a.IP
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case *net.IPNet:
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ip = a.IP
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default:
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continue
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}
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// Assume that net.(*Interface).Addrs can only return valid IPv4
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// and IPv6 addresses. Thus, if it isn't an IPv4 address, it
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// must be an IPv6 one.
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switch ipv {
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case IPVersion4:
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if ip4 := ip.To4(); ip4 != nil {
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ips = append(ips, ip4)
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}
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case IPVersion6:
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if ip6 := ip.To4(); ip6 == nil {
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ips = append(ips, ip)
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}
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default:
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return nil, fmt.Errorf("invalid ip version %d", ipv)
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}
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}
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return ips, nil
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}
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// IfaceDNSIPAddrs returns IP addresses of the interface suitable to send to
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// clients as DNS addresses. If err is nil, addrs contains either no addresses
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// or at least two.
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//
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// It makes up to maxAttempts attempts to get the addresses if there are none,
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// each time using the provided backoff. Sometimes an interface needs a few
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// seconds to really ititialize.
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//
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// See https://github.com/AdguardTeam/AdGuardHome/issues/2304.
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func IfaceDNSIPAddrs(
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iface NetIface,
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ipv IPVersion,
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maxAttempts int,
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backoff time.Duration,
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) (addrs []net.IP, err error) {
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var n int
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for n = 1; n <= maxAttempts; n++ {
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addrs, err = IfaceIPAddrs(iface, ipv)
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if err != nil {
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return nil, fmt.Errorf("getting ip addrs: %w", err)
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}
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if len(addrs) > 0 {
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break
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}
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log.Debug("dhcpv%d: attempt %d: no ip addresses", ipv, n)
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time.Sleep(backoff)
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}
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switch len(addrs) {
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case 0:
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// Don't return errors in case the users want to try and enable
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// the DHCP server later.
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t := time.Duration(n) * backoff
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log.Error("dhcpv%d: no ip for iface after %d attempts and %s", ipv, n, t)
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return nil, nil
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case 1:
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// Some Android devices use 8.8.8.8 if there is not a secondary
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// DNS server. Fix that by setting the secondary DNS address to
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// the same address.
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//
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// See https://github.com/AdguardTeam/AdGuardHome/issues/1708.
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log.Debug("dhcpv%d: setting secondary dns ip to itself", ipv)
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addrs = append(addrs, addrs[0])
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default:
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// Go on.
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}
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log.Debug("dhcpv%d: got addresses %s after %d attempts", ipv, addrs, n)
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return addrs, nil
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}
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