├── .gitignore ├── .idea ├── .gitignore ├── cdnlookup.iml ├── modules.xml └── vcs.xml ├── LICENSE ├── README.md ├── go.mod ├── go.sum ├── main.go └── util.go /.gitignore: -------------------------------------------------------------------------------- 1 | /bin/ 2 | -------------------------------------------------------------------------------- /.idea/.gitignore: -------------------------------------------------------------------------------- 1 | # 默认忽略的文件 2 | /shelf/ 3 | /workspace.xml 4 | # 基于编辑器的 HTTP 客户端请求 5 | /httpRequests/ 6 | # Datasource local storage ignored files 7 | /dataSources/ 8 | /dataSources.local.xml 9 | -------------------------------------------------------------------------------- /.idea/cdnlookup.iml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | -------------------------------------------------------------------------------- /.idea/modules.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | -------------------------------------------------------------------------------- /.idea/vcs.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | Apache License 2 | Version 2.0, January 2004 3 | http://www.apache.org/licenses/ 4 | 5 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 6 | 7 | 1. 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-------------------------------------------------------------------------------- 1 | # 前言 2 | 前不久我遇到了一个关于获取CDN节点ip列表的问题: 3 | 4 | **如何快速获取一家CDN节点在全国的范围内的节点ip？** 5 | 6 | 为了解决这个问题，我分析了智能DNS的工作原理。根据原理，我写出了一个使用 Edns-Client-Subnet(ECS) 伪造客户端ip用于遍历cdn节点ip的小工具。 7 | 8 | 之前为了获取多个地理位置的的CDN节点需要使用大量代理服务器去发起DNS查询。但是寻找合适的代理服务器非常困难。这个工具解决了这个问题。 9 | 10 | **该工具无需使用代理，只需要提供要模拟的客户端ip地址，就可以轻松获取对应ip地址地理位置的DNS解析结果。** 11 | 12 | # cdnlookup 13 | 一个使用 Edns-Client-Subnet(ECS) 遍历智能DNS节点IP地址的工具 14 | 15 | ## 原理 16 | 17 | #### 智能DNS 18 | CDN 为了让用户连接到地理位置更近的服务器，在DNS解析时使用了一种叫做智能DNS解析的操作。 CDN的权威DNS服务器会根据客户端IP地址来判断用户所在区域及运营商，来返回距离较近的节点。 19 | 20 | 早期，权威DNS服务器通常无法直接获取到客户端ip，只能获取到上级公共递归DNS服务器地址。 21 | 22 | #### Edns Client Subnet(ECS) 23 | 24 | ECS 是由Google提交的一份DNS扩展协议，主要作用是传递用户的IP地址给权威DNS服务器。 25 | 26 | [rfc7871](https://datatracker.ietf.org/doc/html/rfc7871) （2016 年 5 月） 27 | 28 | 遵循ECS标准的公共DNS，会将经遮罩脱敏后的客户端ip添加至DNS扩展区域( [EDNS rfc6891](https://datatracker.ietf.org/doc/html/rfc6891))传递至权威DNS （IPV4 遮罩通常为/24 IPV6 为 /56） 29 | 30 | 这样权威DNS服务器就可以获取到模糊的客户端ip，这足以用于判断用户运营商和位置信息。 31 | 32 | #### cdnlookup 33 | 这个工具会直接发送包含自定义IP的ECS数据的DNS请求，诱导NS服务器返回对应IP的解析结果。 34 | 35 | 经测试，国内大部分公共DNS都不支持自定义ECS。谷歌DNS 8.8.8.8 可以正常使用 36 | 37 | 除了公共递归DNS，也可以直接将带有ECS数据的DNS请求发送到目标权威DNS服务器，获取解析结果。 38 | 39 | # 使用 40 | ```` 41 | -d 域名 (默认 www.taobao.com) 42 | 43 | -i 只输出IP地址列表 44 | 45 | -ip 客户端ip 46 | 47 | -r 请求重复轮数 48 | 49 | -s DNS服务器地址 (默认 8.8.8.8:53) 50 | 51 | -6 AAAA 查询 (IPV6) 52 | ```` 53 | 54 | 自定义客户端ip 55 | ```` 56 | cdnlookup.exe -d www.taobao.com -ip 1.2.3.4 57 | 58 | 219.147.75.XXX 59 | 219.147.75.XXX 60 | ```` 61 | 62 | 使用内置实例ip列表 (内置列表可能会出现判断错误. 建议使用家宽ip段地址定位. ) 63 | ```` 64 | cdnlookup.exe -d www.taobao.com 65 | 66 | 北京市教育网 67 | 36.99.228.XXX 68 | 36.99.228.XXX 69 | 吉林长春移动 70 | 111.26.147.XXX 71 | 111.26.147.XXX 72 | 辽宁沈阳电信 73 | 59.47.225.XXX 74 | 59.47.225.XXX 75 | ...... 76 | ```` 77 | IPV6 查询 78 | 79 | ```` 80 | cdnlookup.exe -d www.jd.com -6 -ip 240e:382:701:7700:600c:5c8:0000:0000 81 | 82 | 240e:c3:2800::26 83 | 240e:c3:2800::22 84 | 240e:95d:c02:200::3a 85 | 86 | ```` 87 | -------------------------------------------------------------------------------- /go.mod: -------------------------------------------------------------------------------- 1 | module cdnlookup 2 | 3 | go 1.18 4 | 5 | require github.com/miekg/dns v1.1.49 6 | 7 | require ( 8 | golang.org/x/mod v0.4.2 // indirect 9 | golang.org/x/net v0.0.0-20210726213435-c6fcb2dbf985 // indirect 10 | golang.org/x/sys v0.0.0-20210630005230-0f9fa26af87c // indirect 11 | golang.org/x/tools v0.1.6-0.20210726203631-07bc1bf47fb2 // indirect 12 | golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect 13 | ) 14 | -------------------------------------------------------------------------------- /go.sum: -------------------------------------------------------------------------------- 1 | github.com/miekg/dns v1.1.49 h1:qe0mQU3Z/XpFeE+AEBo2rqaS1IPBJ3anmqZ4XiZJVG8= 2 | github.com/miekg/dns v1.1.49/go.mod h1:e3IlAVfNqAllflbibAZEWOXOQ+Ynzk/dDozDxY7XnME= 3 | github.com/yuin/goldmark v1.3.5/go.mod h1:mwnBkeHKe2W/ZEtQ+71ViKU8L12m81fl3OWwC1Zlc8k= 4 | golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w= 5 | golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI= 6 | golang.org/x/mod v0.4.2 h1:Gz96sIWK3OalVv/I/qNygP42zyoKp3xptRVCWRFEBvo= 7 | golang.org/x/mod v0.4.2/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA= 8 | golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg= 9 | golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s= 10 | golang.org/x/net v0.0.0-20210405180319-a5a99cb37ef4/go.mod h1:p54w0d4576C0XHj96bSt6lcn1PtDYWL6XObtHCRCNQM= 11 | golang.org/x/net v0.0.0-20210726213435-c6fcb2dbf985 h1:4CSI6oo7cOjJKajidEljs9h+uP0rRZBPPPhcCbj5mw8= 12 | golang.org/x/net v0.0.0-20210726213435-c6fcb2dbf985/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y= 13 | golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM= 14 | golang.org/x/sync v0.0.0-20210220032951-036812b2e83c h1:5KslGYwFpkhGh+Q16bwMP3cOontH8FOep7tGV86Y7SQ= 15 | golang.org/x/sync v0.0.0-20210220032951-036812b2e83c/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM= 16 | golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY= 17 | golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= 18 | golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= 19 | golang.org/x/sys v0.0.0-20210330210617-4fbd30eecc44/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= 20 | golang.org/x/sys v0.0.0-20210423082822-04245dca01da/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= 21 | golang.org/x/sys v0.0.0-20210510120138-977fb7262007/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg= 22 | golang.org/x/sys v0.0.0-20210630005230-0f9fa26af87c h1:F1jZWGFhYfh0Ci55sIpILtKKK8p3i2/krTr0H1rg74I= 23 | golang.org/x/sys v0.0.0-20210630005230-0f9fa26af87c/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg= 24 | golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo= 25 | golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ= 26 | golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ= 27 | golang.org/x/text v0.3.6/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ= 28 | golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ= 29 | golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo= 30 | golang.org/x/tools v0.1.6-0.20210726203631-07bc1bf47fb2 h1:BonxutuHCTL0rBDnZlKjpGIQFTjyUVTexFOdWkB6Fg0= 31 | golang.org/x/tools v0.1.6-0.20210726203631-07bc1bf47fb2/go.mod h1:o0xws9oXOQQZyjljx8fwUC0k7L1pTE6eaCbjGeHmOkk= 32 | golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0= 33 | golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0= 34 | golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 h1:go1bK/D/BFZV2I8cIQd1NKEZ+0owSTG1fDTci4IqFcE= 35 | golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0= 36 | -------------------------------------------------------------------------------- /main.go: -------------------------------------------------------------------------------- 1 | package main 2 | 3 | import ( 4 | "flag" 5 | "fmt" 6 | "github.com/miekg/dns" 7 | "log" 8 | "net" 9 | "strings" 10 | ) 11 | 12 | var IpMap map[string]bool 13 | 14 | func dnsquery(domain string, ip string, DnsServer string, OnlyIp bool, repeat int, v6 bool) { 15 | if !strings.HasSuffix(domain, ".") { 16 | domain += "." 17 | } 18 | c := new(dns.Client) 19 | m := new(dns.Msg) 20 | if v6 { 21 | m.SetQuestion(domain, dns.TypeAAAA) 22 | } else { 23 | m.SetQuestion(domain, dns.TypeA) 24 | } 25 | 26 | o := new(dns.OPT) 27 | o.Hdr.Name = "." 28 | o.Hdr.Rrtype = dns.TypeOPT 29 | // 缺少UDP payload size 有些NS不会响应 30 | o.SetUDPSize(dns.DefaultMsgSize) 31 | e := new(dns.EDNS0_SUBNET) //EDNS 32 | e.Code = dns.EDNS0SUBNET 33 | if v6 { 34 | e.Family = 2 // 1 IPv4 2 IPv6 35 | e.SourceNetmask = 56 // 地址掩码 ipv4 一般为 /24 ipv6为 /56 36 | e.Address = net.ParseIP(ip).To16() 37 | } else { 38 | e.Family = 1 39 | e.SourceNetmask = 24 40 | e.Address = net.ParseIP(ip).To4() 41 | } 42 | 43 | e.SourceScope = 0 44 | o.Option = append(o.Option, e) 45 | m.Extra = append(m.Extra, o) 46 | for i := 0; i < repeat; i++ { 47 | in, _, err := c.Exchange(m, DnsServer) //注意:要选择支持自定义EDNS的DNS 或者是目标NS服务器国内DNS大部分不支持自定义EDNS数据 48 | 49 | if err != nil { 50 | log.Fatal(err) 51 | } 52 | for _, answer := range in.Answer { 53 | 54 | if answer.Header().Rrtype == dns.TypeA { 55 | if OnlyIp { 56 | IpMap[answer.(*dns.A).A.String()] = true 57 | } else { 58 | println(answer.(*dns.A).A.String()) 59 | } 60 | } else if answer.Header().Rrtype == dns.TypeAAAA { 61 | IpMap[answer.(*dns.AAAA).AAAA.String()] = true 62 | } 63 | } 64 | } 65 | 66 | } 67 | 68 | func main() { 69 | Initlist() 70 | var domain = flag.String("d", "www.taobao.com", "domain") 71 | var DnsServer = flag.String("s", "8.8.8.8:53", "dns server addr") 72 | var ip = flag.String("ip", "", "client ip") 73 | var OnlyIp = flag.Bool("i", false, "Only output ip addr") 74 | var repeat = flag.Int("r", 1, "repeat query rounds") 75 | var v6 = flag.Bool("6", false, "query AAAA (ipv6)") 76 | flag.Parse() 77 | IpMap = make(map[string]bool) 78 | if (*ip != "") || (*v6) { 79 | *OnlyIp = true 80 | dnsquery(*domain, *ip, *DnsServer, *OnlyIp, *repeat, *v6) 81 | } else { 82 | for city, ip := range CityMap { 83 | if !*OnlyIp { 84 | fmt.Println(city) 85 | } 86 | dnsquery(*domain, ip, *DnsServer, *OnlyIp, *repeat, *v6) 87 | 88 | } 89 | } 90 | 91 | if *OnlyIp { 92 | for ip, _ := range IpMap { 93 | println(ip) 94 | } 95 | } 96 | 97 | } 98 | -------------------------------------------------------------------------------- /util.go: -------------------------------------------------------------------------------- 1 | package main 2 | 3 | var countryMap map[string]string 4 | var CityMap map[string]string 5 | 6 | func Initlist() { 7 | CityMap = make(map[string]string) 8 | CityMap["北京市移动"] = "39.156.128.0" 9 | CityMap["北京市联通"] = "114.240.0.0" 10 | CityMap["北京市电信"] = "1.202.0.0" 11 | CityMap["北京市教育网"] = "58.200.0.0" 12 | 13 | CityMap["黑龙江哈尔滨移动"] = "211.137.243.0" 14 | CityMap["黑龙江哈尔滨联通"] = "113.0.0.0" 15 | CityMap["黑龙江哈尔滨电信"] = "42.100.0.0" 16 | CityMap["黑龙江哈尔滨教育网"] = "58.194.0.0" 17 | 18 | CityMap["吉林长春移动"] = "39.134.160.0" 19 | CityMap["吉林长春联通"] = "119.48.0.0" 20 | CityMap["吉林长春电信"] = "36.48.0.0" 21 | CityMap["吉林长春教育网"] = "59.72.0.0" 22 | 23 | CityMap["辽宁沈阳移动"] = "211.137.32.0" 24 | CityMap["辽宁沈阳联通"] = "113.224.0.0" 25 | CityMap["辽宁沈阳电信"] = "182.200.0.0" 26 | CityMap["辽宁沈阳教育网"] = "219.216.0.0" 27 | 28 | CityMap["上海移动"] = "211.137.243.0" 29 | CityMap["上海联通"] = "220.248.0.0" 30 | CityMap["上海电信"] = "101.80.0.0" 31 | CityMap["上海教育网"] = "58.194.0.0" 32 | 33 | CityMap["天津天津移动"] = "211.137.160.1" 34 | CityMap["天津天津联通"] = "61.181.81.1" 35 | CityMap["天津天津电信"] = "221.238.6.1" 36 | CityMap["天津天津教育网"] = "58.207.63.253" 37 | 38 | CityMap["重庆重庆移动"] = "218.201.39.204" 39 | CityMap["重庆重庆联通"] = "221.5.255.1" 40 | CityMap["重庆重庆电信"] = "218.70.65.254" 41 | CityMap["重庆重庆教育网"] = "202.202.216.1" 42 | 43 | CityMap["河北石家庄移动"] = "218.207.75.1" 44 | CityMap["河北石家庄联通"] = "221.192.1.1" 45 | CityMap["河北石家庄电信"] = "123.180.0.200" 46 | CityMap["河北石家庄教育网"] = "202.206.232.1" 47 | 48 | CityMap["山西太原移动"] = "211.142.24.17" 49 | CityMap["山西太原联通"] = "221.204.253.1" 50 | CityMap["山西太原电信"] = "219.149.144.1" 51 | CityMap["山西太原教育网"] = "202.207.130.1" 52 | 53 | CityMap["广东广州移动"] = "211.139.145.34" 54 | CityMap["广东广州联通"] = "211.95.193.69" 55 | CityMap["广东广州电信"] = "58.61.200.1" 56 | CityMap["广东广州教育网"] = "202.116.64.8" 57 | 58 | CityMap["江苏南京移动"] = "120.195.118.1" 59 | CityMap["江苏南京联通"] = "218.104.118.33" 60 | CityMap["江苏南京电信"] = "58.212.24.1" 61 | CityMap["江苏南京教育网"] = "202.119.32.7" 62 | } 63 | --------------------------------------------------------------------------------