Added cloudflared features

[TejasPersonal]

What's New

System cloudflared Binary Detection

If cloudflared is already installed on the system (found via PATH), it will be used directly instead of downloading a bundled copy.

Why:

• Avoids redundant downloads when a binary is already available.
• Enables support on environments previously considered "unsupported" (e.g. Termux on Android), where a system-provided binary may work even if this package's bundled binaries do not.

Note: If no system binary is found, the package falls back to downloading one as before.

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host and scheme Arguments (tunnel function)

The tunnel-launching function — previously exposed as __call__ — has been renamed to tunnel() and now accepts two new arguments: host and scheme.

Why:

• host allows forwarding a custom local IP address instead of assuming 127.0.0.1.
• scheme (protocol) allows forwarding non-HTTP traffic — most notably tcp, which makes it possible to tunnel arbitrary TCP services such as SSH.

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access Function

A new access() function uses cloudflared to proxy a remote tunnel URL back down to a local address.

Why: this complements tunnel() to enable full round-trip forwarding. For example, tunnel() can expose a local SSH port as a public HTTPS tunnel URL; access() can then be used on another device to consume that URL and proxy it back into a local TCP connection.
ssh/tcp (host) → https (forwarded tunnel URL) → ssh/tcp (proxied local access)

This effectively lets you SSH into a machine through a Cloudflare tunnel, without exposing the SSH port directly to the internet.

[Bing-su]

Thank you for your contribution.
However, pycloudflared is currently downloaded over 1000 times a day, so breaking api changes cannot be adopted casually. Please avoid making changes to the api.

[Bing-su]

Other programs I've seen that use already installed applications usually receive them via environment variables. That approach seems like the way to go here as well.

[TejasPersonal]

well ...
after evaluating pycloudflared, I found it doesn't meet my requirements. The library is missing features and lacks robustness
therefore: https://github.com/TejasPersonal/flared [I didn't write much readme yet]
this doesn't work like a auto download wrapper, its more of a interface or client

I learnt about atexit from your code, thanks!