[{"_1":2,"_168":-5,"_169":-5},"loaderData",{"_3":4,"_13":14,"_21":22,"_143":144},"root",{"_5":-5,"_6":-7,"_7":8,"_9":-7,"_10":11,"_12":-7},"currentUser","primaryEmail","siteVerification","6LeIxAcTAAAAAJcZVRqyHh71UMIEGNQ_MXjiZKhI","toast","enableDev",false,"incidentStatus","routes/_layout",{"_15":-5,"_16":17,"_18":17,"_19":11,"_20":11},"username","isAskGordonEnabled",true,"isUsingNewTemplate","showMinimalLanding","showHoneypotTrap","routes/_layout.r.$namespace.$reponame",{"_23":24,"_25":-5,"_26":11,"_27":11,"_28":29,"_30":31,"_32":-5,"_33":11,"_34":35,"_84":-5,"_85":86,"_134":-5,"_135":11,"_136":17,"_137":11,"_138":-5,"_139":11,"_140":-5,"_141":142},"canonicalUrl","https://hub.docker.com/r/jamesits/snd/tags","mcpServer","canSeeDockerfile","canSeeAutobuilds","namespace","jamesits","reponame","snd","cloudBuildSource","isAutobuildsAvailable","repo",{"_36":37,"_38":39,"_41":42,"_43":44,"_45":11,"_46":47,"_48":49,"_50":51,"_53":31,"_28":29,"_54":55,"_56":40,"_57":58,"_59":58,"_60":61,"_62":-5,"_63":64,"_65":66,"_67":11,"_68":29,"_69":70,"_75":11,"_76":77,"_81":29,"_82":83},"categories",[],"content_types",[40],"image","date_registered","2019-12-09T08:26:14.656298Z","description","","is_private","last_updated","2021-02-23T13:54:02.221332Z","last_modified","2024-10-16T13:48:34.145251Z","media_types",[52],"application/vnd.docker.container.image.v1+json","name","pull_count",75231,"repository_type","star_count",1,"status","status_description","active","source","collaborator_count",0,"full_description","# SND\r\n\r\nMinimal authoritative PTR (rDNS, reverse DNS) resolver with automatic generation of records.\r\n\r\n**WARNING**: This piece of software is at a very early development stage and should be considered experimental. It only implements a minimal feature set to pass the RIPE automated DNS test and is by no means standard-compliant. Please don't run it in production. \r\n\r\n[![Build Status](https://dev.azure.com/nekomimiswitch/General/_apis/build/status/SND?branchName=master)](https://dev.azure.com/nekomimiswitch/General/_build/latest?definitionId=71&branchName=master)\r\n[![](https://images.microbadger.com/badges/image/jamesits/snd.svg)](https://microbadger.com/images/jamesits/snd \"Get your own image badge on microbadger.com\")\r\n\r\n## Motivation\r\n\r\nSay you have a large collection of IP addresses (thousands of IPv4 /24 blocks, or one IPv6 /32 block), and you want to have PTR records on all of your IPs. Writing a zonefile and hosting it using any traditional authoritative DNS server is unrealistic: the zonefile will be of multiple GBs and you need an enormous amount of memory to even load it. \r\n\r\nSND provides you a simple alternative option: you name a base domain, and SND generates PTR records for you on the fly based on a set of pre-defined rules. \r\n\r\n```\r\n1.1.168.192.in-addr.arpa. 1000 IN PTR 192.168.1.1.ptr.example.com.\r\n1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.1.0.0.0.0.0.d.f.ip6.arpa. 1000 IN PTR fd00.1.0.0.0.0.0.1.ptr.example.com.\r\n```\r\n\r\n## Requirements\r\n\r\n### Hardware\r\n\r\nSND can run on very little processing power (Raspberry Pis are fine) and a very small memory footprint (a few MBs) although the performance will be not optimal.\r\n\r\nAs of version 0.1.2, on a 4-core Intel E5-2670 VM with more than 2GiB memory, SND can process around 25K RPS.\r\n\r\n### Software\r\n\r\nOfficially supported OS: \r\n\r\n* Linux (kernel 4.19+ with glibc)\r\n* Windows (Windows Server 2016 or later, Windows 10 Desktop 1809 or later)\r\n\r\nOther OSes are not currently tested because of the lack of resources available to me.\r\n\r\n## Usage\r\n\r\n### Configure SND\r\n\r\nCopy over the self-documented [example config](examples/config.toml) and tweak it for your own need. Please do not leave any `example.com` things in your own config. Remove what you don't need. \r\n\r\nCurrently no strict config file format checking is implemented -- you might crash the program if some important keys are missing. \r\n\r\n### Set up SND\r\n\r\nIn most cases you are going to need 2 servers (or one server with 2 different IP addresses if you don't care about availability issues). Copy the exact same config file to both servers and launch SND on both of them:\r\n\r\nDownload the pre-compiled binary from [releases](https://github.com/Jamesits/SND/releases) to your server and run it:\r\n\r\n```shell\r\nchmod +x ./snd\r\n./snd -config path/to/config.toml\r\n```\r\n\r\nOr, if you prefer Docker:\r\n\r\n```shell\r\ndocker run --rm -p 53:53 -p 53:53/udp -v path/to/config.toml:/etc/snd/config.toml:ro snd:latest\r\n```\r\n\r\nRun a simple test using dig:\r\n\r\n```shell\r\n$ dig @localhost -x 192.0.2.1\r\n\r\n; <<>> DiG 9.11.5-P4-5.1-Debian <<>> @localhost -x 192.0.2.1\r\n; (1 server found)\r\n;; global options: +cmd\r\n;; Got answer:\r\n;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 50924\r\n;; flags: qr aa rd; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0\r\n;; WARNING: recursion requested but not available\r\n\r\n;; QUESTION SECTION:\r\n;1.2.0.192.in-addr.arpa. IN PTR\r\n\r\n;; ANSWER SECTION:\r\n1.2.0.192.in-addr.arpa. 3600 IN PTR 192.0.2.1.example.com.\r\n```\r\n\r\n### Set up DNS records\r\n\r\nYou need at least 2 `A` or `AAAA` records pointing to each of your SND servers. You might need to set them up as glue records based on your actual config.\r\n\r\n```\r\nns1.example.com.\t3600\tIN\tA\t192.0.2.1\r\nns2.example.com.\t3600\tIN\tA\t192.0.2.2\r\n```\r\n\r\n### Set up PTR record delegation\r\n\r\nSet up a `domain` object at your RIR like this. \r\n\r\n```\r\ndomain: \r\ndescr: \r\nadmin-c: \r\ntech-c: \r\nzone-c: \r\nnserver: ns1.example.com\r\nnserver: ns2.example.com\r\nmnt-by: \r\n```\r\n\r\nDetailed instructions are provided per RIR:\r\n\r\n* [AfriNIC](https://afrinic.net/support/requesting-reverse-delegation)\r\n* [ARIN](https://www.arin.net/resources/manage/reverse/)\r\n* [APNIC](https://www.apnic.net/manage-ip/manage-resources/reverse-dns/)\r\n* [LACNIC](https://www.lacnic.net/685/2/lacnic/5-delegation-of-reverse-resolution)\r\n* [RIPE NCC](https://www.ripe.net/manage-ips-and-asns/db/support/configuring-reverse-dns)\r\n\r\nNotes:\r\n\r\n* The smallest IP block sizes available for delegation differ\r\n* Only RIPE NCC is currently tested because I cannot afford IP blocks from the other RIRs\r\n\r\n## Compilation\r\n\r\nGolang 1.13.5 or later is officially supported. Before starting, make sure the `GOROOT` and `GOPATH` environment variables are set correctly and there is a `go` binary is in your `PATH`.\r\n\r\n### Linux\r\n\r\n```shell\r\ngit clone https://github.com/Jamesits/SND.git\r\ncd SND\r\n./build.sh\r\n```\r\n\r\nCollect the binary in the `build` directory.\r\n\r\n### Other OSes\r\n\r\n#### Cross Compilation from Linux\r\n\r\nSet the `GOOS` and `GOARCH` to the desired [values](https://gist.github.com/asukakenji/f15ba7e588ac42795f421b48b8aede63) and run `build.sh`.\r\n\r\n#### Native Build\r\n\r\nYou need to figure out how to build on these platforms on yourself if you want a native build.","has_starred","hub_user","immutable_tags_settings",{"_71":11,"_72":73},"enabled","rules",[74],".*","is_automated","permissions",{"_78":17,"_79":11,"_80":11},"read","write","admin","user","storage_size",96843101,"orgData","recentTags",[87,124],{"_88":40,"_89":90,"_91":92,"_93":94,"_95":96,"_46":113,"_114":90,"_115":29,"_116":52,"_53":117,"_118":119,"_120":104,"_121":113,"_122":61,"_123":17},"content_type","creator",193099,"full_size",29126808,"id",79169787,"images",[97],{"_98":99,"_100":101,"_102":44,"_103":104,"_105":106,"_107":108,"_109":44,"_110":-5,"_111":92,"_59":61,"_112":-5},"architecture","amd64","digest","sha256:1619db3fd8e3ebf1fd6d4bf3d15ced781c5d963bb2c7f79f0fadae7ce8d461da","features","last_pulled","2026-09-21T19:11:23.41087603Z","last_pushed","2021-02-23T13:54:02Z","os","linux","os_features","os_version","size","variant","2021-02-23T13:54:01.804959Z","last_updater","last_updater_username","media_type","latest","repository",8149561,"tag_last_pulled","tag_last_pushed","tag_status","v2",{"_88":40,"_89":90,"_91":125,"_93":126,"_95":127,"_46":132,"_114":90,"_115":29,"_116":52,"_53":133,"_118":119,"_120":130,"_121":132,"_122":61,"_123":17},29126811,79170286,[128],{"_98":99,"_100":129,"_102":44,"_103":130,"_105":131,"_107":108,"_109":44,"_110":-5,"_111":125,"_59":61,"_112":-5},"sha256:50f20708169b715a8a63af1c8556697c2905296c1c1f01a31685bd0307260d31","2026-09-22T02:13:34.375174978Z","2021-02-23T13:50:34Z","2021-02-23T13:50:33.453466Z","master-latest","sbxKitMetadata","isPotentialSpam","isHubSbxKitsEnabled","showSbxLogoOverride","sbxTrademarkText","displaySecurityMetadata","tagAttestations","tagsHaveAttestations",[],"routes/_layout.r.$namespace.$reponame.tags",{"_34":145,"_152":153,"_141":166,"_167":11},{"_36":146,"_38":147,"_41":42,"_43":44,"_45":11,"_46":47,"_48":49,"_50":148,"_53":31,"_28":29,"_54":55,"_56":40,"_57":58,"_59":58,"_60":61,"_62":-5,"_63":64,"_65":66,"_67":11,"_68":29,"_69":149,"_75":11,"_76":151,"_81":29,"_82":83},[],[40],[52],{"_71":11,"_72":150},[74],{"_78":17,"_79":11,"_80":11},"tags",{"_154":155,"_156":-5,"_157":-5,"_158":159},"count",2,"next","previous","results",[160,163],{"_88":40,"_89":90,"_91":92,"_93":94,"_95":161,"_46":113,"_114":90,"_115":29,"_116":52,"_53":117,"_118":119,"_120":104,"_121":113,"_122":61,"_123":17},[162],{"_98":99,"_100":101,"_102":44,"_103":104,"_105":106,"_107":108,"_109":44,"_110":-5,"_111":92,"_59":61,"_112":-5},{"_88":40,"_89":90,"_91":125,"_93":126,"_95":164,"_46":132,"_114":90,"_115":29,"_116":52,"_53":133,"_118":119,"_120":130,"_121":132,"_122":61,"_123":17},[165],{"_98":99,"_100":129,"_102":44,"_103":130,"_105":131,"_107":108,"_109":44,"_110":-5,"_111":125,"_59":61,"_112":-5},[],"canDeleteTags","actionData","errors"]

jamesits/snd

Tags for jamesits/snd