51 lines
1.4 KiB
Fennel
51 lines
1.4 KiB
Fennel
(local tftp (require :tftp))
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(local { : realpath} (require :posix.stdlib))
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(local { : view } (require :fennel))
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(local options
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(match arg
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["-a" ip-address dir]
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{ :allow ip-address :base-directory (realpath dir)}
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[dir]
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{ :allow nil :base-directory (realpath dir)}
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[]
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(error "missing command line parameters")
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))
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(print (.. "TFTP serving from " options.base-directory))
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(fn merge-pathname [directory filename]
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(if (directory:match "/$")
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(.. directory filename)
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(.. directory "/" filename)))
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(->
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(tftp:listen
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(fn [file host port]
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(if (or (not options.allow) (= host options.allow))
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(let [pathname (merge-pathname options.base-directory file)
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f (io.open pathname "rb")
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size (f:seek "end")]
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(f:seek "set" 0)
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(var eof? false)
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(values
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(fn handler [reqlen]
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(let [bytes (f:read reqlen)]
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(if eof?
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false
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bytes
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(values true bytes)
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(do
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;; if the file length is divisible by the block
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;; length, need to send an empty block at eof
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(set eof? true)
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(values true "")))))
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size))
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(error "host not allowed")))
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nil
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["*"]
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69)
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(os.exit))
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