Philip Withnall 4ca89d7807 gsocks5proxy: Return G_IO_ERROR_PROXY_NEED_AUTH if anonymous auth fails
If a username and password are specified by the caller, `GSocks5Proxy`
tells the server that it supports anonymous *and* username/password
authentication, and the server can choose which it prefers.

Otherwise, `GSocks5Proxy` only says that it supports anonymous
authentication. If that’s not acceptable to the server, the code was
previously returning `G_IO_ERROR_PROXY_AUTH_FAILED`. That error code
doesn’t indicate to the caller that authentication might succeed were
they to provide a username and password.

Change the error handling to make that clearer. A fuller solution would
be to expose more of the method negotiation in the `GSocks5Proxy` API,
so that the caller can specify ahead of time which authentication
methods they want to use. That can follow in issue #2059 though.

Signed-off-by: Philip Withnall <withnall@endlessm.com>

Fixes: #1988
2020-03-10 15:20:48 +00:00
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