├── .github └── workflows │ └── release.yml ├── .gitignore ├── .goreleaser.yml ├── LICENSE ├── README.md ├── go.mod ├── go.sum ├── udpme.go └── upstream.go /.github/workflows/release.yml: -------------------------------------------------------------------------------- 1 | name: Release udpme 2 | 3 | on: 4 | workflow_dispatch: 5 | push: 6 | tags: 7 | - '*' 8 | 9 | jobs: 10 | goreleaser: 11 | runs-on: ubuntu-latest 12 | steps: 13 | - 14 | name: Checkout 15 | uses: actions/checkout@v2 16 | with: 17 | fetch-depth: 0 18 | - 19 | name: Set up Go 20 | uses: actions/setup-go@v2 21 | with: 22 | go-version: '1.17' 23 | - 24 | name: Run GoReleaser 25 | uses: goreleaser/goreleaser-action@v2 26 | with: 27 | version: latest 28 | args: release --rm-dist 29 | env: 30 | GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }} 31 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | # Binaries for programs and plugins 2 | *.exe 3 | *.exe~ 4 | *.dll 5 | *.so 6 | *.dylib 7 | 8 | # Test binary, built with `go test -c` 9 | *.test 10 | 11 | # Output of the go coverage tool, specifically when used with LiteIDE 12 | *.out 13 | 14 | # Dependency directories (remove the comment below to include it) 15 | vendor/ 16 | 17 | # release dir 18 | release/ 19 | 20 | # ide 21 | .vscode/ 22 | .idea/ 23 | 24 | # test utils 25 | testutils/ 26 | -------------------------------------------------------------------------------- /.goreleaser.yml: -------------------------------------------------------------------------------- 1 | before: 2 | hooks: 3 | # You may remove this if you don't use go modules. 4 | - go mod tidy 5 | builds: 6 | - id: udpme-build 7 | env: 8 | - CGO_ENABLED=0 9 | goos: 10 | - linux 11 | - windows 12 | goarch: 13 | - amd64 14 | - arm 15 | - arm64 16 | - mipsle 17 | - mips 18 | - 386 19 | gomips: 20 | - hardfloat 21 | - softfloat 22 | goarm: 23 | - 7 24 | ignore: 25 | - goos: windows 26 | goarch: arm 27 | goarm: 7 28 | flags: 29 | - -trimpath 30 | ldflags: 31 | - -s -w 32 | 33 | archives: 34 | - id: udpme-archive 35 | builds: 36 | - udpme-build 37 | name_template: "{{ .ProjectName }}-{{ .Os }}-{{ .Arch }}{{ if .Arm }}-{{ .Arm }}{{ end }}{{ if .Mips }}-{{ .Mips }}{{ end }}" 38 | format: zip 39 | files: 40 | - LICENSE 41 | - README.md 42 | changelog: 43 | skip: true 44 | 45 | snapshot: 46 | name_template: "{{ .Tag }}-next" 47 | 48 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. 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If the Program does not specify a version number of the 576 | GNU General Public License, you may choose any version ever published 577 | by the Free Software Foundation. 578 | 579 | If the Program specifies that a proxy can decide which future 580 | versions of the GNU General Public License can be used, that proxy's 581 | public statement of acceptance of a version permanently authorizes you 582 | to choose that version for the Program. 583 | 584 | Later license versions may give you additional or different 585 | permissions. However, no additional obligations are imposed on any 586 | author or copyright holder as a result of your choosing to follow a 587 | later version. 588 | 589 | 15. Disclaimer of Warranty. 590 | 591 | THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY 592 | APPLICABLE LAW. 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Limitation of Liability. 601 | 602 | IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING 603 | WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS 604 | THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY 605 | GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE 606 | USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF 607 | DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD 608 | PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), 609 | EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF 610 | SUCH DAMAGES. 611 | 612 | 17. Interpretation of Sections 15 and 16. 613 | 614 | If the disclaimer of warranty and limitation of liability provided 615 | above cannot be given local legal effect according to their terms, 616 | reviewing courts shall apply local law that most closely approximates 617 | an absolute waiver of all civil liability in connection with the 618 | Program, unless a warranty or assumption of liability accompanies a 619 | copy of the Program in return for a fee. 620 | 621 | END OF TERMS AND CONDITIONS 622 | 623 | How to Apply These Terms to Your New Programs 624 | 625 | If you develop a new program, and you want it to be of the greatest 626 | possible use to the public, the best way to achieve this is to make it 627 | free software which everyone can redistribute and change under these terms. 628 | 629 | To do so, attach the following notices to the program. It is safest 630 | to attach them to the start of each source file to most effectively 631 | state the exclusion of warranty; and each file should have at least 632 | the "copyright" line and a pointer to where the full notice is found. 633 | 634 | 635 | Copyright (C) 636 | 637 | This program is free software: you can redistribute it and/or modify 638 | it under the terms of the GNU General Public License as published by 639 | the Free Software Foundation, either version 3 of the License, or 640 | (at your option) any later version. 641 | 642 | This program is distributed in the hope that it will be useful, 643 | but WITHOUT ANY WARRANTY; without even the implied warranty of 644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 645 | GNU General Public License for more details. 646 | 647 | You should have received a copy of the GNU General Public License 648 | along with this program. If not, see . 649 | 650 | Also add information on how to contact you by electronic and paper mail. 651 | 652 | If the program does terminal interaction, make it output a short 653 | notice like this when it starts in an interactive mode: 654 | 655 | Copyright (C) 656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 657 | This is free software, and you are welcome to redistribute it 658 | under certain conditions; type `show c' for details. 659 | 660 | The hypothetical commands `show w' and `show c' should show the appropriate 661 | parts of the General Public License. Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | . 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | . 675 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # udpme 2 | 3 | UDPME 会发送带 EDNS0 的 UDP 请求报文，然后过滤掉没有 EDNS0 的应答报文。如果服务器支持 EDNS0 那么它的回应报文中也会有 EDNS0。如果收到没有 EDNS0 的回应则这个回应有问题。 4 | 5 | 实验性功能，使用条件特殊，不保证稳定性和可用性。要求服务器必须支持 EDNS0。 6 | 7 | ## 命令参数 8 | 9 | ```txt 10 | -l string 11 | 监听地址。(默认 "127.0.0.1:5353") 12 | -u string 13 | UDP 上游地址。支持自定义端口。必需支持 EDNS0。 (默认 "8.8.8.8") 14 | -t 快速测试上游是否支持 EDNS0。 15 | ``` 16 | 17 | ## 使用 18 | 19 | 正常使用: 20 | 21 | ```bash 22 | udpme -l 127.0.0.1:5353 -u 8.8.8.8 23 | ``` 24 | 25 | 测试服务器是否支持 EDNS0: 26 | 27 | 打印 `edns0 response received` 说明支持。打印 `response received without edns0` 说明不支持。 28 | 29 | ```bash 30 | udpme -u 8.8.8.8 -t 31 | ``` 32 | 33 | 或者也可以用 `dig +edns` 测试。 34 | 35 | ```txt 36 | > dig +edns cloudflare.com @8.8.8.8 37 | 38 | ; <<>> DiG 9.16.1-Ubuntu <<>> +edns cloudflare.com @8.8.8.8 39 | ;; global options: +cmd 40 | ;; Got answer: 41 | ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 2173 42 | ;; flags: qr rd ra ad; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 1 43 | 44 | ;; OPT PSEUDOSECTION: 45 | ; EDNS: version: 0, flags:; udp: 512 <-- 支持 EDNS0 的服务器应答中会有这行 46 | ;; QUESTION SECTION: 47 | ;cloudflare.com. IN A 48 | 49 | ;; ANSWER SECTION: 50 | cloudflare.com. 300 IN A 104.16.132.229 51 | cloudflare.com. 300 IN A 104.16.133.229 52 | 53 | ;; Query time: 7 msec 54 | ;; SERVER: 8.8.8.8#53(8.8.8.8) 55 | ;; WHEN: Tue Mar 15 01:42:53 UTC 2022 56 | ;; MSG SIZE rcvd: 75 57 | ``` 58 | 59 | ## 其他项目 60 | 61 | - [mosdns](https://github.com/IrineSistiana/mosdns): 一个插件化"可编程"的 DNS 服务器。用户可以按需拼接插件，搭建出自己想要的 DNS 服务器。 62 | - [mosdns-cn](https://github.com/IrineSistiana/mosdns-cn): 本地/远程 DNS 分流器。可以同时根据域名和 IP 分流，更准确。常见平台支持命令行一键安装。 63 | -------------------------------------------------------------------------------- /go.mod: -------------------------------------------------------------------------------- 1 | module github.com/IrineSistiana/udpme 2 | 3 | go 1.17 4 | 5 | require github.com/miekg/dns v1.1.47 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 v1.1.47 h1:J9bWiXbqMbnZPcY8Qi2E3EWIBsIm6MZzzJB9VRg5gL8= 2 | github.com/miekg/dns v1.1.47/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 | -------------------------------------------------------------------------------- /udpme.go: -------------------------------------------------------------------------------- 1 | package main 2 | 3 | import ( 4 | "flag" 5 | "log" 6 | "net" 7 | 8 | "github.com/miekg/dns" 9 | ) 10 | 11 | var ( 12 | listenAddr = flag.String("l", "127.0.0.1:5353", "listen address") 13 | upstreamAddr = flag.String("u", "8.8.8.8", "upstream address") 14 | testEDNS0 = flag.Bool("t", false, "test upstream edns0 support") 15 | ) 16 | 17 | func main() { 18 | flag.Parse() 19 | 20 | if *testEDNS0 { 21 | test() 22 | return 23 | } 24 | 25 | run() 26 | } 27 | 28 | func test() { 29 | m := new(dns.Msg) 30 | m.SetQuestion("cloudflare.com.", dns.TypeA) 31 | m.SetEdns0(512, false) 32 | u := newUpstream(*upstreamAddr) 33 | r, err := u.exchange(m) 34 | if err != nil { 35 | log.Printf("err: %s", err) 36 | } else { 37 | if opt := r.IsEdns0(); opt != nil { 38 | log.Printf("edns0 response received") 39 | } else { 40 | log.Printf("response received without edns0") 41 | } 42 | } 43 | } 44 | 45 | func run() { 46 | p, err := net.ListenPacket("udp", *listenAddr) 47 | if err != nil { 48 | log.Fatal(err) 49 | } 50 | log.Printf("server started at %s", *listenAddr) 51 | 52 | u := newUpstream(*upstreamAddr) 53 | readBuf := make([]byte, 64*1024) 54 | for { 55 | n, addr, err := p.ReadFrom(readBuf) 56 | if err != nil { 57 | log.Fatalf("listener err: %s", err) 58 | } 59 | 60 | q := new(dns.Msg) 61 | if err := q.Unpack(readBuf[:n]); err != nil { 62 | log.Printf("invalid incoming package from [%s], err: %s", addr, err) 63 | continue 64 | } 65 | 66 | go func() { 67 | r, err := u.exchange(q) 68 | if err != nil { 69 | log.Printf("err: %s", err) 70 | r = new(dns.Msg) 71 | r.SetReply(q) 72 | r.Rcode = dns.RcodeServerFailure 73 | } 74 | if r != nil { 75 | writeBuf, err := r.Pack() 76 | if err != nil { 77 | log.Printf("failed to pack response, %s", err) 78 | return 79 | } 80 | p.WriteTo(writeBuf, addr) 81 | } 82 | }() 83 | } 84 | } 85 | -------------------------------------------------------------------------------- /upstream.go: -------------------------------------------------------------------------------- 1 | package main 2 | 3 | import ( 4 | "net" 5 | "time" 6 | 7 | "github.com/miekg/dns" 8 | ) 9 | 10 | type upstream struct { 11 | addr string 12 | } 13 | 14 | func tryAddPort(addr string, port string) string { 15 | if _, _, err := net.SplitHostPort(addr); err != nil { 16 | addr = net.JoinHostPort(addr, port) 17 | } 18 | return addr 19 | } 20 | 21 | func newUpstream(addr string) *upstream { 22 | return &upstream{addr: tryAddPort(addr, "53")} 23 | } 24 | 25 | func (u *upstream) exchange(m *dns.Msg) (*dns.Msg, error) { 26 | if m.IsEdns0() != nil { 27 | return u.exchangeOPTM(m) 28 | } 29 | mc := m.Copy() 30 | mc.SetEdns0(512, false) 31 | r, err := u.exchangeOPTM(mc) 32 | if err != nil { 33 | return nil, err 34 | } 35 | removeEDNS0(r) 36 | return r, nil 37 | } 38 | 39 | func (u *upstream) exchangeOPTM(m *dns.Msg) (*dns.Msg, error) { 40 | c, err := dns.Dial("udp", u.addr) 41 | if err != nil { 42 | return nil, err 43 | } 44 | defer c.Close() 45 | c.SetDeadline(time.Now().Add(time.Second * 3)) 46 | if opt := m.IsEdns0(); opt != nil { 47 | c.UDPSize = opt.UDPSize() 48 | } 49 | if err := c.WriteMsg(m); err != nil { 50 | return nil, err 51 | } 52 | 53 | for { 54 | r, err := c.ReadMsg() 55 | if err != nil { 56 | return nil, err 57 | } 58 | if r.IsEdns0() == nil { 59 | continue 60 | } 61 | return r, nil 62 | } 63 | } 64 | 65 | func removeEDNS0(m *dns.Msg) { 66 | for i := len(m.Extra) - 1; i >= 0; i-- { 67 | if m.Extra[i].Header().Rrtype == dns.TypeOPT { 68 | m.Extra = append(m.Extra[:i], m.Extra[i+1:]...) 69 | return 70 | } 71 | } 72 | return 73 | } 74 | --------------------------------------------------------------------------------