Top 4 C Tunnel Projects

KCP

7 14,629 2.9 C

:zap: KCP - A Fast and Reliable ARQ Protocol

Project mention: KCP – A TCP alternative optimized for latency | news.ycombinator.com | 2024-03-28

iodine

58 5,787 5.1 C

Official git repo for iodine dns tunnel

Project mention: Show HN: This Website Is Hosted on DNS | news.ycombinator.com | 2024-02-25

Reminds me of using https://code.kryo.se/iodine/ ( DNS tunnel ) and a empty prepaid card...

WorkOS

workos.com sponsored

The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.
httptunnel

3 395 2.7 C

Bidirectional data stream tunnelled in HTTP requests.

Project mention: Actual SSH over HTTPS | news.ycombinator.com | 2023-12-23

Corkscrew works for a specific use case:
1. you're behind an HTTP proxy, and
2. the HTTP proxy support the CONNECT method
Around 20 years ago I did a short contract which had #1 but not #2. Thankfully, there's a tool for this, too. Of course it requires some set up on the server side:
https://github.com/larsbrinkhoff/httptunnel

ptunnel-ng

1 349 3.2 C

Tunnel TCP connections through ICMP.

Project mention: How does Linux NAT a ping? | news.ycombinator.com | 2023-09-10

Nod, I remember it not being as effective/easy to hide as exfiltration over UDP/DNS too, as there was always less background noise to hide in. That said, I found this with a quick search - https://github.com/utoni/ptunnel-ng for those who still want to do it. A number of hotels and captive portals still let ping’s through even if they play tricks with UDP/TCP.
Any significant data over ICMP will always stick out though if anyone is doing analysis. Which isn’t often, frankly, in situations like I described, but…

NOTE: The open source projects on this list are ordered by number of github stars. The number of mentions indicates repo mentiontions in the last 12 Months or since we started tracking (Dec 2020). The latest post mention was on 2024-03-28.