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Port to DragonFly BSD #49

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Port to DragonFly BSD #49

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Commits on Jun 19, 2021

  1. Port to DragonFly BSD 

    Original patch (on top of commit e852f4c) by Aaron Li <[email protected]> in
2020. Rebased with minor tweaks.

The TUN device/interface on DragonFly BSD is very similar to the FreeBSD
one, so it's rather easy to port WireGuard-go to DragonFly BSD based on
the FreeBSD support code.

The `tun_dragonfly.go` code is derived from the `tun_freebsd.go` code.
One major difference is that DragonFly BSD's TUN device supports the
`TUNGIFNAME` ioctl [0] for easily getting the assigned interface name.
The remaining differences are mostly minor cleanups and tweaks.

I've tested that DragonFly BSD's TUN device doesn't have the race issue
like the FreeBSD one [1], so I didn't keep the code to disable LLv6.

Tested on DragonFly BSD master branch (6.1-DEVELOPMENT) as of
2021-Jun-18. Requires a pending fix to the x/net library:
https://go-review.googlesource.com/c/net/+/328331/

Also thank François Tigeot, who ported WireGuard-go to DragonFly BSD's
DeltaPorts/DPorts [2].

[0] DragonFlyBSD/DragonFlyBSD@0df03f1
[1] WireGuard@bb42ec7
[2] DragonFlyBSD/DeltaPorts@ef67233

Signed-off-by: James Cook <[email protected]>
    @falsifian
    falsifian committed Jun 19, 2021
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