[Bug 2625] Support Capabilities for ssh client port forwarding

[bugzilla-daemon at bugzilla.mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=2625

--- Comment #5 from Darren Tucker <dtucker at zip.com.au> ---
(In reply to Alexey Mochkin from comment #4)
> Your bind_permitted() function should have fallback to check for uid
> == 0 if no capabilities were presented.

fair enough, but it'd be cleaner if it just fell through, eg:

int
bind_permitted(int port, uid_t uid)
{
#ifdef LINUX_CAPABILITIES
        if (linux_capability_bind_permitted())
                return 1;
#endif
        if (port < IPPORT_RESERVED && uid != 0)
                return 0;
        return 1;

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