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The semantics of setuid in SUID processes are not entirely clear on all
Unix-like systems. Better use setresuid to drop privileges where available.
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Also, return early when no log destination would get the message anyways.
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This makes it unnecessary to iterate over all peers for maintenance, and
desynchronizes different peers' keepalives.
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Based-on-patch-by: Julian Kornberger <jk+github@digineo.de>
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Some systems (like FreeBSD) don't delete TUN/TAP interfaces after closing,
add some infrastructure to do that.
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Fixes a warning with -Wunused-result.
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Based-on-patch-by: Julian Kornberger <jk+github@digineo.de>
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headers
In in-tree builds, fastd's poll.h was conflicting with the system one on
non-Linux systems.
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shell command lookup
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peer group
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Instead of adding compatiblity code to make this work with musl, just duplicate
the needed definitions in fastd.
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Also remove some dead code
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interface exists yet
Allows using dynamic interfaces with dynamic peers.
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Not really tested, I'll do that when the multiif support is finished.
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