mirror of
https://github.com/oneclickvirt/backtrace.git
synced 2026-08-13 20:29:14 +08:00
97 lines
2.5 KiB
Go
97 lines
2.5 KiB
Go
package backtrace
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import (
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_ "embed"
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"net/netip"
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"strings"
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)
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//go:embed prefix/as4809.txt
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var as4809Data string
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//go:embed prefix/as4134.txt
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var as4134Data string
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//go:embed prefix/as9929.txt
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var as9929Data string
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//go:embed prefix/as10099.txt
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var as10099Data string
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//go:embed prefix/as4837.txt
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var as4837Data string
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//go:embed prefix/as58807.txt
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var as58807Data string
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//go:embed prefix/as9808.txt
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var as9808Data string
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//go:embed prefix/as58453.txt
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var as58453Data string
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//go:embed prefix/as23764.txt
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var as23764Data string
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// ASN -> Prefix strings
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var asnPrefixes = map[string][]string{
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"AS4809": strings.Split(as4809Data, "\n"), // 电信 CN2 GT/GIA
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"AS4134": strings.Split(as4134Data, "\n"), // 电信 163 骨干网
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"AS9929": strings.Split(as9929Data, "\n"), // 联通 9929 优质国际线路
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"AS10099": strings.Split(as10099Data, "\n"), // 联通 CUG 国际网络
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"AS4837": strings.Split(as4837Data, "\n"), // 联通 AS4837 普通国际线路
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"AS58807": strings.Split(as58807Data, "\n"), // 移动 CMIN2 国际精品网
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"AS9808": strings.Split(as9808Data, "\n"), // 移动 CMI（中国移动国际公司）
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"AS58453": strings.Split(as58453Data, "\n"), // 移动国际互联网（CMI/HK）
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"AS23764": strings.Split(as23764Data, "\n"), // 电信 CTGNET/国际出口（可能是CN2-B）
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}
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// 判断 IPv6 地址是否匹配 ASN 中的某个前缀
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func ipv6Asn(ip string) string {
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ip = strings.ToLower(ip)
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address, addressErr := netip.ParseAddr(ip)
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if addressErr != nil || !address.Is6() {
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return ""
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}
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bestASN := ""
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bestSpecificity := -1
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for asn, prefixes := range currentASNPrefixes() {
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for _, prefix := range prefixes {
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prefix = strings.TrimSpace(prefix)
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if prefix == "" {
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continue
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}
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if strings.Contains(prefix, "/") {
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network, networkErr := netip.ParsePrefix(prefix)
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if networkErr == nil && network.Contains(address) &&
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(network.Bits() > bestSpecificity || (network.Bits() == bestSpecificity && asn < bestASN)) {
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bestASN = asn
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bestSpecificity = network.Bits()
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}
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continue
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}
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if strings.HasPrefix(ip, prefix) {
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specificity := prefixHexBits(prefix)
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if specificity > bestSpecificity || (specificity == bestSpecificity && asn < bestASN) {
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bestASN = asn
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bestSpecificity = specificity
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}
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}
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}
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}
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return bestASN
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}
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func prefixHexBits(prefix string) int {
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bits := 0
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for _, value := range prefix {
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switch {
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case value >= '0' && value <= '9':
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bits += 4
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case value >= 'a' && value <= 'f':
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bits += 4
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}
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}
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return bits
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}
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