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Pull request: 2704 local addresses vol.2

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Merge in DNS/adguard-home from 2704-local-addresses-vol.2 to master

Updates #2704.
Updates #2829.

Squashed commit of the following:

commit 507d038c2709de59246fc0b65c3c4ab8e38d1990
Author: Eugene Burkov <e.burkov@adguard.com>
Date:   Wed Mar 31 14:33:05 2021 +0300

    aghtest: fix file name

commit 8e19f99337bee1d88ad6595adb96f9bb23fa3c41
Author: Eugene Burkov <e.burkov@adguard.com>
Date:   Wed Mar 31 14:06:43 2021 +0300

    aghnet: rm redundant mutexes

commit 361fa418b33ed160ca20862be1c455ab9378c03f
Author: Eugene Burkov <e.burkov@adguard.com>
Date:   Wed Mar 31 13:45:30 2021 +0300

    all: fix names, docs

commit 14034f4f0230d7aaa3645054946ae5c278089a99
Merge: 35e265cc a72ce1cf
Author: Eugene Burkov <e.burkov@adguard.com>
Date:   Wed Mar 31 13:38:15 2021 +0300

    Merge branch 'master' into 2704-local-addresses-vol.2

commit 35e265cc8cd308ef1fda414b58c0217cb5f258e4
Author: Eugene Burkov <e.burkov@adguard.com>
Date:   Wed Mar 31 13:33:35 2021 +0300

    aghnet: imp naming

commit 7a7edac7208a40697d7bc50682b923a144e28e2b
Author: Eugene Burkov <e.burkov@adguard.com>
Date:   Tue Mar 30 20:59:54 2021 +0300

    changelog: oops, nope yet

commit d26a5d2513daf662ac92053b5e235189a64cc022
Author: Eugene Burkov <e.burkov@adguard.com>
Date:   Tue Mar 30 20:55:53 2021 +0300

    all: some renaming for the glory of semantics

commit 9937fa619452b0742616217b975e3ff048d58acb
Author: Eugene Burkov <e.burkov@adguard.com>
Date:   Mon Mar 29 15:34:42 2021 +0300

    all: log changes

commit d8d9e6dfeea8474466ee25f27021efdd3ddb1592
Author: Eugene Burkov <e.burkov@adguard.com>
Date:   Fri Mar 26 18:32:23 2021 +0300

    all: imp localresolver, imp cutting off own addresses

commit 344140df449b85925f19b460fd7dc7c08e29c35a
Author: Eugene Burkov <e.burkov@adguard.com>
Date:   Fri Mar 26 14:53:33 2021 +0300

    all: imp code quality

commit 1c5c0babec73b125044e23dd3aa75d8eefc19b28
Author: Eugene Burkov <e.burkov@adguard.com>
Date:   Thu Mar 25 20:44:08 2021 +0300

    all: fix go.mod

commit 0b9fb3c2369a752e893af8ddc45a86bb9fb27ce5
Author: Eugene Burkov <e.burkov@adguard.com>
Date:   Thu Mar 25 20:38:51 2021 +0300

    all: add error handling

commit a7a2e51f57fc6f8f74b95a264ad345cd2a9e026e
Merge: c13be634 27f4f052
Author: Eugene Burkov <e.burkov@adguard.com>
Date:   Thu Mar 25 19:48:36 2021 +0300

    Merge branch 'master' into 2704-local-addresses-vol.2

commit c13be634f47bcaed9320a732a51c0e4752d0dad0
Author: Eugene Burkov <e.burkov@adguard.com>
Date:   Thu Mar 25 18:52:28 2021 +0300

    all: cover rdns with tests, imp aghnet functionality

commit 48bed9025944530c613ee53e7961d6d5fbabf8be
Author: Eugene Burkov <e.burkov@adguard.com>
Date:   Wed Mar 24 20:18:07 2021 +0300

    home: make rdns great again

commit 1dbacfc8d5b6895807797998317fe3cc814617c1
Author: Eugene Burkov <e.burkov@adguard.com>
Date:   Wed Mar 24 16:07:52 2021 +0300

    all: imp external client restriction

commit 1208a319a7f4ffe7b7fa8956f245d7a19437c0a4
Author: Eugene Burkov <e.burkov@adguard.com>
Date:   Mon Mar 22 15:26:45 2021 +0300

    all: finish local ptr processor

commit c8827fc3db289e1a5d7a11d057743bab39957b02
Author: Eugene Burkov <e.burkov@adguard.com>
Date:   Tue Mar 2 13:41:22 2021 +0300

    all: imp ipdetector, add local ptr processor
This commit is contained in:
Eugene Burkov
2021-03-31 15:00:47 +03:00
parent a72ce1cfae
commit 86444eacc2
30 changed files with 1418 additions and 360 deletions
Download Patch File Download Diff File Expand all files Collapse all files

152
internal/aghnet/net.go
View File

@@ -97,25 +97,10 @@ func (iface *NetInterface) MarshalJSON() ([]byte, error) {
})
}
// GetValidNetInterfaces returns interfaces that are eligible for DNS and/or DHCP
// invalid interface is a ppp interface or the one that doesn't allow broadcasts
func GetValidNetInterfaces() ([]net.Interface, error) {
ifaces, err := net.Interfaces()
if err != nil {
return nil, fmt.Errorf("couldn't get list of interfaces: %w", err)
}
netIfaces := []net.Interface{}
netIfaces = append(netIfaces, ifaces...)
return netIfaces, nil
}
// GetValidNetInterfacesForWeb returns interfaces that are eligible for DNS and WEB only
// we do not return link-local addresses here
func GetValidNetInterfacesForWeb() ([]*NetInterface, error) {
ifaces, err := GetValidNetInterfaces()
ifaces, err := net.Interfaces()
if err != nil {
return nil, fmt.Errorf("couldn't get interfaces: %w", err)
}
@@ -273,3 +258,138 @@ func SplitHost(hostport string) (host string, err error) {
return host, nil
}
// TODO(e.burkov): Inspect the charToHex, ipParseARPA6, ipReverse and
// UnreverseAddr and maybe refactor it.
// charToHex converts character to a hexadecimal.
func charToHex(n byte) int8 {
if n >= '0' && n <= '9' {
return int8(n) - '0'
} else if (n|0x20) >= 'a' && (n|0x20) <= 'f' {
return (int8(n) | 0x20) - 'a' + 10
}
return -1
}
// ipParseARPA6 parse IPv6 reverse address
func ipParseARPA6(s string) (ip6 net.IP) {
if len(s) != 63 {
return nil
}
ip6 = make(net.IP, 16)
for i := 0; i != 64; i += 4 {
// parse "0.1."
n := charToHex(s[i])
n2 := charToHex(s[i+2])
if s[i+1] != '.' || (i != 60 && s[i+3] != '.') ||
n < 0 || n2 < 0 {
return nil
}
ip6[16-i/4-1] = byte(n2<<4) | byte(n&0x0f)
}
return ip6
}
// ipReverse inverts byte order of ip.
func ipReverse(ip net.IP) (rev net.IP) {
ipLen := len(ip)
rev = make(net.IP, ipLen)
for i, b := range ip {
rev[ipLen-i-1] = b
}
return rev
}
// ARPA addresses' suffixes.
const (
arpaV4Suffix = ".in-addr.arpa"
arpaV6Suffix = ".ip6.arpa"
)
// UnreverseAddr tries to convert reversed ARPA to a normal IP address.
func UnreverseAddr(arpa string) (unreversed net.IP) {
// Unify the input data.
arpa = strings.TrimSuffix(arpa, ".")
arpa = strings.ToLower(arpa)
if strings.HasSuffix(arpa, arpaV4Suffix) {
ip := strings.TrimSuffix(arpa, arpaV4Suffix)
ip4 := net.ParseIP(ip).To4()
if ip4 == nil {
return nil
}
return ipReverse(ip4)
} else if strings.HasSuffix(arpa, arpaV6Suffix) {
ip := strings.TrimSuffix(arpa, arpaV6Suffix)
return ipParseARPA6(ip)
}
// The suffix unrecognizable.
return nil
}
// The length of extreme cases of arpa formatted addresses.
//
// The example of IPv4 with maximum length:
//
// 49.91.20.104.in-addr.arpa
//
// The example of IPv6 with maximum length:
//
// 1.3.b.5.4.1.8.6.0.0.0.0.0.0.0.0.0.0.0.0.0.1.0.0.0.0.7.4.6.0.6.2.ip6.arpa
//
const (
arpaV4MaxLen = len("000.000.000.000") + len(arpaV4Suffix)
arpaV6MaxLen = len("0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0") +
len(arpaV6Suffix)
)
// ReverseAddr returns the ARPA hostname of the ip suitable for reverse DNS
// (PTR) record lookups. This is the modified version of ReverseAddr from
// github.com/miekg/dns package with no error among returned values.
func ReverseAddr(ip net.IP) (arpa string) {
var strLen int
var suffix string
// Don't handle errors in implementations since strings.WriteString
// never returns non-nil errors.
var writeByte func(val byte)
b := &strings.Builder{}
if ip4 := ip.To4(); ip4 != nil {
strLen, suffix = arpaV4MaxLen, arpaV4Suffix[1:]
ip = ip4
writeByte = func(val byte) {
_, _ = b.WriteString(strconv.Itoa(int(val)))
_, _ = b.WriteRune('.')
}
} else if ip6 := ip.To16(); ip6 != nil {
strLen, suffix = arpaV6MaxLen, arpaV6Suffix[1:]
ip = ip6
writeByte = func(val byte) {
lByte, rByte := val&0xF, val>>4
_, _ = b.WriteString(strconv.FormatUint(uint64(lByte), 16))
_, _ = b.WriteRune('.')
_, _ = b.WriteString(strconv.FormatUint(uint64(rByte), 16))
_, _ = b.WriteRune('.')
}
} else {
return ""
}
b.Grow(strLen)
for i := len(ip) - 1; i >= 0; i-- {
writeByte(ip[i])
}
_, _ = b.WriteString(suffix)
return b.String()
}