55 lines
1.5 KiB
Racket
55 lines
1.5 KiB
Racket
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#lang racket
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(require racket/struct)
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(provide peer subnet
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string->ip
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ip->string
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string->subnet
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subnet->string
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string->peer)
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(struct peer [ip type]
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#:methods gen:custom-write
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[(define write-proc
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(make-constructor-style-printer
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(lambda (x) 'peer)
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(lambda (x) (list (ip->string (peer-ip x)) (peer-type x)))))])
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(struct subnet [ip mask]
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#:methods gen:custom-write
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[(define write-proc
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(make-constructor-style-printer
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(lambda (x) 'subnet)
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(lambda (x) (list (subnet->string x)))))])
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(define (string->ip str)
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(let ([parts (reverse (string-split str "."))])
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(for/sum ([i (in-range 4)]
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[part parts])
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(arithmetic-shift (string->number part) (* i 8)))))
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(define (ip->string ip)
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(string-join
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(reverse
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(for/list ([i (in-range 4)])
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(number->string (bitwise-and
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(arithmetic-shift ip (* i -8)) 255))))
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"."))
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(define (string->subnet str)
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(match (string-split str "/")
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[(list ipstr maskstr) (subnet (string->ip ipstr)
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(string->number maskstr))]))
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(define (subnet->string sub)
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(string-append
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(ip->string (subnet-ip sub))
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"/"
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(number->string (subnet-mask sub))))
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(define (string->peer str)
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(match (string-split str "-")
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[(list ip type)
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(peer (string->ip ip) (string->symbol type))]))
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