[feature] Extract ip address directly from interface.

[comicchang]

Directly extract ip address from network interface.

Useful if you:

1. Has multiply interfaces and ECMP.
2. Behind nat.

config file:

"method": "netif", // or anything other than "http"
"interface": "ppp0",

[timothymiller]

I just merged your changes. I had to merge a few changes from other PRs. I included you in the commit messages: cb7b180

[timothymiller]

Had to revert the PR because netif is not compatible with alpine linux.

Let me know if you have time to investigate a solution for alpine linux that is compatible with your netif solution.

[comicchang]

Sure, I'll look into it when I have time.

[comicchang]

@timothymiller
I can remove the dependency on netifaces and use a pure Python method to get the IP address of a network interface. However, this method only works on Linux and may not work on Windows or macOS. Does this modification meet your expectations?

[comicchang]

Hi, I've removed the netifaces dependency, reimplemented in pure python, rebased to the latest master, and tested it.

Please review the commit.

[timothymiller]

That sounds like a fine trade off @comicchang since the primary way of running this will be in a Linux container.

[ricky9w]

@comicchang @timothymiller Maybe allowing users to customize the IP query command would be a more flexible solution? This would solve the cross-platform issue and provide greater flexibility.

[comicchang]

@comicchang @timothymiller Maybe allowing users to customize the IP query command would be a more flexible solution? This would solve the cross-platform issue and provide greater flexibility.

Sounds good to me!
I'll try to implement it this weekend.

[ricky9w]

Another PR to allow running custom script to get IPv4 & 6 address #131