Add support for proxy username/password authentication

[alexbakker]

Progress:

• SOCKS5
• HTTP

Figured I'd submit this in advance so you guys can take a look and scrutinize my horrid C skills if needed.

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This change is

[GrayHatter]

Reviewed 3 of 5 files at r1.
Review status: 3 of 5 files reviewed at latest revision, 4 unresolved discussions.

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toxcore/TCP_client.c, line 142 [r1] (raw file):
what if the password is blank?

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toxcore/TCP_client.c, line 198 [r1] (raw file):
what happens if a client forgets to use a null term?

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toxcore/TCP_client.c, line 987 [r1] (raw file):
no callback to the client that the connection was refused?

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toxcore/tox.c, line 198 [r1] (raw file):
what if there's no null term?

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Comments from the review on Reviewable.io

[alexbakker]

Review status: 3 of 5 files reviewed at latest revision, 4 unresolved discussions, some commit checks failed.

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toxcore/TCP_client.c, line 142 [r1] (raw file):
In that case you'd set proxy_password to an empty string.

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toxcore/TCP_client.c, line 198 [r1] (raw file):
That's their problem. C strings should always be NULL-terminated and the documentation even states that it should be.

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toxcore/TCP_client.c, line 987 [r1] (raw file):
Indeed. Look at the surrounding code, you'll see the exact same thing everywhere.

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toxcore/tox.c, line 198 [r1] (raw file):
See other comment.

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Comments from the review on Reviewable.io

[nurupo]

What about tox.h version tick?

I guess the version will be ticked manually by @irungentoo whenever he feels like releasing new version.

[GrayHatter]

Reviewed 2 of 5 files at r1.
Review status: all files reviewed at latest revision, 2 unresolved discussions, some commit checks failed.

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toxcore/TCP_client.c, line 142 [r1] (raw file):
do you want to document this?

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toxcore/TCP_client.c, line 987 [r1] (raw file):
Network error vs input error, we were able to connect, the password was just refused.

Also it's wrong now isn't a reason to leave it wrong. If I'm going to implement this in µTox I need to know if the server rejected the connection, or the auth.

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Comments from the review on Reviewable.io

[alexbakker]

Review status: 2 of 5 files reviewed at latest revision, 1 unresolved discussion.

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toxcore/TCP_client.c, line 142 [r1] (raw file):
Actually, I took another look at the SOCKS5 spec and it turns out both the username and the password must have a minimum length of 1. I added checks and comments for this.

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toxcore/TCP_client.c, line 987 [r1] (raw file):
I agree. I'll see what I can do.

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Comments from the review on Reviewable.io

[GrayHatter]

Reviewed 3 of 3 files at r2.
Review status: all files reviewed at latest revision, 2 unresolved discussions.

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other/apidsl/tox.in.h, line 604 [r2] (raw file):
length

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Comments from the review on Reviewable.io

[alexbakker]

Review status: all files reviewed at latest revision, 2 unresolved discussions.

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other/apidsl/tox.in.h, line 604 [r2] (raw file):
Fixed.

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Comments from the review on Reviewable.io

[GrayHatter]

Reviewed 1 of 2 files at r3.
Review status: 4 of 5 files reviewed at latest revision, 1 unresolved discussion.

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Comments from the review on Reviewable.io

[GrayHatter]

Reviewed 1 of 2 files at r3.
Review status: all files reviewed at latest revision, 1 unresolved discussion.

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Comments from the review on Reviewable.io

[irungentoo]

you can use string functions in tox.c but not here.

Save the length in the proxy settings struct.

[alexbakker]

@irungentoo Fixed.

EDIT: I lied, sorry. This is what happens when I don't test things.
EDIT2: Should be actually fixed now. Will test when I get home.

[GrayHatter]

@Impyy reopen on toktok/toxcore?