Forward Proxy Support? #1409

ezekieldas · 2024-03-20T00:37:33Z

ezekieldas
Mar 20, 2024

I'm testing blocky in an environment which requires all http/https requests to use a forward proxy. I have the following env vars defined on OS:

no_proxy=localhost, .somewhere.io
ftp_proxy=ftp://proxy.somewhere.io:8118
https_proxy=http://proxy.somewhere.io:8118
HTTPS_PROXY=http://proxy.somewhere.io:8118
HTTP_PROXY=http://proxy.somewhere.io:8118
http_proxy=http://proxy.somewhere.io:8118

When I start blocky as a standalone binary, requests against blocklists fail:

[2024-03-19 17:19:17]  WARN list_cache: Temporary network err / Timeout occurred: temporary error occurred: Get "http://sysctl.org/cameleon/hosts": dial tcp 213.186.34.12:80: i/o timeout (Client.Timeout exceeded while awaiting headers) attempt=2/3 link=http://sysctl.org/cameleon/hosts
[2024-03-19 17:19:17]  WARN list_cache: Temporary network err / Timeout occurred: temporary error occurred: Get "https://raw.githubusercontent.com/StevenBlack/hosts/master/hosts": context deadline exceeded (Client.Timeout exceeded while awaiting headers) attempt=2/3 link=https://raw.githubusercontent.com/StevenBlack/hosts/master/hosts

Yet when I test this in an environment where 80/443 are not blocked, blocky starts just fine:

[2024-03-19 17:31:44]  INFO list_cache: import succeeded count=20562 source=http://sysctl.org/cameleon/hosts
[2024-03-19 17:31:45]  INFO list_cache: import succeeded count=178085 source=https://raw.githubusercontent.com/StevenBlack/hosts/master/hosts

I'm not well versed in Go but is there a library which could be included in the blocky build to support forward proxy?

Answered by ThinkChaos

Mar 20, 2024

Hi,

This shouldn't be hard to support. Go has support for the env proxy variables in the standard library. It's even enabled by default.
We use a custom "HTTP Transport" so we can override the name resolution, and provide the right SNI for DoH/DoT. That has the side effect of disabling the env proxy support.

I'll look at basing our transport on the default one instead of building it from scratch: #1411

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ThinkChaos · 2024-03-20T19:01:59Z

ThinkChaos
Mar 20, 2024
Collaborator

Hi,

This shouldn't be hard to support. Go has support for the env proxy variables in the standard library. It's even enabled by default.
We use a custom "HTTP Transport" so we can override the name resolution, and provide the right SNI for DoH/DoT. That has the side effect of disabling the env proxy support.

I'll look at basing our transport on the default one instead of building it from scratch: #1411

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Forward Proxy Support? #1409

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Forward Proxy Support? #1409

ezekieldas Mar 20, 2024

Replies: 1 comment

ThinkChaos Mar 20, 2024 Collaborator

ezekieldas
Mar 20, 2024

ThinkChaos
Mar 20, 2024
Collaborator