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feat: Handle NAT64 address query (#200)

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We can query the NAT64 address by the IPv4 address part of the NAT64
address. This is useful when we want to know the NAT64 address of a
specific IPv4 address. We also add a new regex pattern to match the
NAT64 address like 64:ff9b::1.1.1.1 .

Signed-off-by: Yangyu Chen <cyy@cyyself.name>
This commit is contained in:
Yangyu Chen 2024-12-30 14:04:06 +08:00 committed by GitHub
parent 2e758d3117
commit 8c17abbd66
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GPG Key ID: B5690EEEBB952194
2 changed files with 15 additions and 1 deletions
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14
internal/db/db.go
View File

@ -2,6 +2,7 @@ package db
import (
"log"
"net"
"github.com/spf13/viper"
@ -72,6 +73,19 @@ func Find(typ dbif.QueryType, query string) *Result {
if result, found := queryCache.Load(query); found {
return result.(*Result)
}
// Convert NAT64 64:ff9b::/96 to IPv4
if typ == dbif.TypeIPv6 {
ip := net.ParseIP(query)
if ip != nil {
_, NAT64, _ := net.ParseCIDR("64:ff9b::/96")
if NAT64.Contains(ip) {
ip4 := make(net.IP, 4)
copy(ip4, ip[12:16])
query = ip4.String()
typ = dbif.TypeIPv4
}
}
}
db := GetDB(typ)
result, err := db.Find(query)
if err != nil {

2
pkg/re/re.go
View File

@ -9,7 +9,7 @@ var (
DomainRe = regexp.MustCompile(`([a-zA-Z0-9][-a-zA-Z0-9]{0,62}\.)+([a-zA-Z][-a-zA-Z]{0,62})`)
IPv4Re = regexp.MustCompile(`(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)(\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3}`)
IPv6Re = regexp.MustCompile(`fe80:(:[0-9a-fA-F]{1,4}){0,4}(%\w+)?|([0-9a-fA-F]{1,4}:){7}[0-9a-fA-F]{1,4}|::[fF]{4}:(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)(\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3}|(([0-9a-fA-F]{1,4}:){0,6}[0-9a-fA-F]{1,4})?::(([0-9a-fA-F]{1,4}:){0,6}[0-9a-fA-F]{1,4})?`)
IPv6Re = regexp.MustCompile(`fe80:(:[0-9a-fA-F]{1,4}){0,4}(%\w+)?|([0-9a-fA-F]{1,4}:){7}[0-9a-fA-F]{1,4}|64:ff9b::(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)(\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3}|::[fF]{4}:(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)(\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3}|(([0-9a-fA-F]{1,4}:){0,6}[0-9a-fA-F]{1,4})?::(([0-9a-fA-F]{1,4}:){0,6}[0-9a-fA-F]{1,4})?`)
)
func MaybeRegexp(s string) bool {