71 lines
2.2 KiB
Fennel
71 lines
2.2 KiB
Fennel
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(local inotify (require :inotify))
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(fn watch-fsevents [directory-name]
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(let [handle (inotify.init)]
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(handle:addwatch directory-name
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inotify.IN_CREATE
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inotify.IN_MOVE
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inotify.IN_DELETE
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inotify.IN_DELETE_SELF
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inotify.IN_MOVED_FROM
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inotify.IN_MOVED_TO
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inotify.IN_CLOSE_WRITE)
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handle))
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(fn merge [table1 table2]
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(collect [k v (pairs table2) &into table1]
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k v))
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(fn parse-extra [s]
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(let [out {}]
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(each [name val (string.gmatch s ",(.-)=([^,]+)")]
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(tset out name val))
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out))
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(fn parse-prefixes [prefixes]
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(icollect [val (string.gmatch prefixes "([^ ]+)")]
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(let [(prefix len preferred valid extra)
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(string.match val "(.-)::/(%d+),(%d+),(%d+)(.*)$")]
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(merge {: prefix : len : preferred : valid} (parse-extra extra))
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)))
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;; Format: <prefix>/<length>,preferred,valid[,excluded=<excluded-prefix>/<length>][,class=<prefix class #>]
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;; (parse-prefixes "2001:8b0:de3a:40dc::/64,7198,7198 2001:8b0:de3a:1001::/64,7198,7188,excluded=1/2,thi=10")
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(fn file-exists? [name]
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(let [f (io.open name :r)]
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(match f
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non-nil (or (f:close) true)
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(nil err) false)))
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(fn read-line [name]
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(with-open [f (assert (io.open name :r) (.. "can't open file " name))]
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(f:read "*l")))
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(var last-update 0)
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(fn event-time [directory]
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(if (file-exists? (.. directory "/state"))
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(tonumber (read-line (.. directory "/last-update")))
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nil))
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(fn wait-for-update [directory fsevents]
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(while (<= (or (event-time directory) 0) last-update)
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(fsevents:read))
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(set last-update (event-time directory))
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true)
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(let [[state-directory lan-device] arg
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fsevents (watch-fsevents state-directory)]
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(while (wait-for-update state-directory fsevents)
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(match (read-line (.. state-directory "/state"))
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(where (or :bound :rebound :informed :updated :ra-updated))
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(let [[{ : prefix : len : preferred : valid }]
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(parse-prefixes (read-line (.. state-directory "/prefixes")))]
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(os.execute (.. "ip address add " prefix "::1/" len
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" dev " lan-device)))
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_ (os.exit 1))))
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