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Explain DNS feature in README

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B. Blechschmidt 2023-03-23 22:44:04 +01:00
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README.md
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@ -36,8 +36,13 @@ sudo ip route add 0.0.0.0/1 dev tun0
Note that if you paste these commands into a shell script, which you then run with `sudo`, you might want to replace Note that if you paste these commands into a shell script, which you then run with `sudo`, you might want to replace
`$USER` with `$SUDO_USER`. `$USER` with `$SUDO_USER`.
For DNS to work, you might need an additional tool like [dnsproxy](https://github.com/AdguardTeam/dnsproxy) that is This tool implements a virtual DNS feature that is used by default. When a DNS packet to port 53 is detected, an IP
configured to listen on a local UDP port and communicates with the upstream DNS server via TCP. address from `198.18.0.0/15` is chosen and mapped to the query name. Connections destined for an IP address from that
range will supply the proxy with the mapped query name instead of the IP address. Since many proxies do not support UDP,
this enables an out-of-the-box experience in most cases, without relying on third-party resolvers or applications.
Depending on your use case, you may want to disable this feature using `--dns none`.
In that case, you might need an additional tool like [dnsproxy](https://github.com/AdguardTeam/dnsproxy) that is
configured to listen on a local UDP port and communicates with a third-party upstream DNS server via TCP.
When you terminate this program and want to eliminate the impact caused by the above several commands, When you terminate this program and want to eliminate the impact caused by the above several commands,
you can execute the following command. The routes will be automatically deleted with the tunnel device. you can execute the following command. The routes will be automatically deleted with the tunnel device.
@ -52,15 +57,17 @@ Tunnel interface to proxy.
Usage: tun2proxy [OPTIONS] --proxy <URL> Usage: tun2proxy [OPTIONS] --proxy <URL>
Options: Options:
-t, --tun <name> Name of the tun interface [default: tun0] -t, --tun <name> Name of the tun interface [default: tun0]
-p, --proxy <URL> The proxy URL in the form proto://[username[:password]@]host:port -p, --proxy <URL> Proxy URL in the form proto://[username[:password]@]host:port
-h, --help Print help -d, --dns <method> DNS handling [default: virtual] [possible values: virtual, none]
-V, --version Print version -h, --help Print help
-V, --version Print version
``` ```
Currently, tun2proxy supports two proxy protocols: HTTP and SOCKS5. A proxy is supplied to the `--proxy` argument in the Currently, tun2proxy supports two proxy protocols: HTTP and SOCKS5. A proxy is supplied to the `--proxy` argument in the
URL format. For example, an HTTP proxy at `1.2.3.4:3128` with a username of `john.doe` and a password of `secret` is URL format. For example, an HTTP proxy at `1.2.3.4:3128` with a username of `john.doe` and a password of `secret` is
supplied as `--proxy http://john.doe:secret@1.2.3.4:3128`. This works analogously to curl's `--proxy` argument. supplied as `--proxy http://john.doe:secret@1.2.3.4:3128`. This works analogously to curl's `--proxy` argument.
## TODO ## TODO
- Increase error robustness (reduce `unwrap` and `expect` usage)
- UDP support for SOCKS - UDP support for SOCKS
- Virtual DNS - Native support for proxying DNS over TCP or TLS