41 lines
1.5 KiB
Fennel
41 lines
1.5 KiB
Fennel
(local { : system } (require :anoia))
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(local svc (require :anoia.svc))
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(fn changes [old-addresses new-addresses]
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(let [added {}
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deleted {}]
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(each [n address (pairs new-addresses)]
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(if (not (. old-addresses n))
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(table.insert added address)))
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(each [n address (pairs old-addresses)]
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(if (not (. new-addresses n))
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(table.insert deleted address)))
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(values added deleted)))
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(fn update-prefixes [device prefixes new-prefixes]
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(let [(added deleted) (changes prefixes new-prefixes)]
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;; if some address has changed (e.g. preferred/valid lifetime)
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;; then we don't want to delete it before re-adding it because
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;; the kernel will drop any routes that go through it. On the
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;; other hand, we can't add it _before_ deleting it as we'll
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;; get an error that it already exists. Therefore, use "change"
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;; instead of "add", it works a bit more like an upsert
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(each [_ p (ipairs added)]
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(system
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(.. "ip address change " p.address "1/" p.len " dev " device
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" valid_lft " p.valid
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" preferred_lft " p.preferred
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)))
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(each [_ p (ipairs deleted)]
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(system
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(.. "ip address del " p.address "1/" p.len " dev " device)))))
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(fn run []
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(let [[state-directory lan-device] arg
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dir (svc.open state-directory)]
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(accumulate [addresses []
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v (dir:events)]
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(update-prefixes lan-device addresses (v:output "prefix")))))
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{ : changes : run }
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