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A reverse IPv4 to IPv6 TLS SNI and HTTP proxy written in GoLang

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delorean

delorean, a reverse IPv4 to IPv6 TLS SNI and HTTP proxy written in GoLang, takes you back to the future if you're stuck on the old IPv4 internet.

Features

  • Multi-port
  • Signal handling for graceful shutdown
  • LRU cache for DNS lookups with a configurable TTL (Time-To-Live)
  • Supports both TLS and HTTP connections to extract the hostname
  • Backend connection based on IPv6 addresses with a specific prefix
  • Concurrency and multithreading to handle multiple clients efficiently
  • Lazy DNS cache reloading to minimize lookup delays
  • Extensive unit tests to ensure reliability and performance
  • Simple and readable codebase (like all our repos)

Use case

We use this in production on the IPv6.rs network, proxying thousands of websites. We open sourced this as part of our commitment to transparency. You should know how your packets are being handled.

Test results

These tests were performed in a Virtual Machine running on a 4 year old laptop.

$ go test -v main.go main_test.go
=== RUN   TestGetNameAndBufferFromTLSConnection
2024/05/20 19:38:34 Packet Data: 16030300720100006e0303b6b26afb555e03d565a36af05ea5430293b959a754c3dd78575834c582fd53d1000004000100ff010000410000000e000c00000f7777772e6578616d706c652e636f6d000d0020001e060106020603050105020503040104020403030103020303020102020203000f000101
--- PASS: TestGetNameAndBufferFromTLSConnection (0.00s)
=== RUN   TestGetNameAndBufferFromHTTPConnection
--- PASS: TestGetNameAndBufferFromHTTPConnection (0.00s)
=== RUN   TestStressServer
    main_test.go:207: Total failed connections: 0 out of 1000 attempts
--- PASS: TestStressServer (1.04s)
=== RUN   TestMemoryUsage
2024/05/20 19:38:35 Packet Data: 16030300720100006e0303b6b26afb555e03d565a36af05ea5430293b959a754c3dd78575834c582fd53d1000004000100ff010000410000000e000c00000f7777772e6578616d706c652e636f6d000d0020001e060106020603050105020503040104020403030103020303020102020203000f000101
2024/05/20 19:38:35 Memory before: Alloc = 890480 TotalAlloc = 890480 Sys = 12801288 NumGC = 0
2024/05/20 19:38:35 Memory after: Alloc = 2600808 TotalAlloc = 21688720 Sys = 13194504 NumGC = 7
--- PASS: TestMemoryUsage (0.01s)
PASS
ok  	command-line-arguments	1.050s
$ free -h
               total        used        free      shared  buff/cache   available
Mem:            15Gi       1.2Gi       8.5Gi       335Mi       5.9Gi        13Gi
Swap:          2.0Gi          0B       2.0Gi
$ nproc
4

License

Copyright (c) 2024 IPv6rs Limited https://ipv6.rs

All Rights Reserved.

COOL License.

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A reverse IPv4 to IPv6 TLS SNI and HTTP proxy written in GoLang

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