88 lines
2.6 KiB
Scheme
88 lines
2.6 KiB
Scheme
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(load "../bindings/libc.scm")
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(load "../bindings/utils.scm")
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(define (udpsock-create fx)
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(fx
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(check-err
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(socket 'AF_INET 'SOCK_DGRAM 'IPPROTO_IP)
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"Unable to init UDP socket")))
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(define (udpsock-reuseaddr sock)
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(alloc
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(ftype-sizeof int)
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(lambda (activation)
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(foreign-set! 'int activation 0 1)
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(check-err
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(setsockopt
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sock
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'SOL_SOCKET
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'SO_REUSEADDR
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activation
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(ftype-sizeof int))
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"Unable to set REUSE ADDRESS"))))
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(define (configure-sockaddr_in! addr host port)
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(ftype-set! sockaddr_in (common family) addr (domain->int 'AF_INET))
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(ftype-set! sockaddr_in (port) addr (htons port))
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(check-err
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(inet_pton
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'AF_INET
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host
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(ftype-pointer-address
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(ftype-&ref sockaddr_in (addr) addr)))
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"Unable to convert your IP address to binary"))
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(define (build-sockaddr_in host port cb)
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(alloc
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(ftype-sizeof sockaddr_in)
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(lambda (raw-addr)
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(let ([addr (make-ftype-pointer sockaddr_in raw-addr)])
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(configure-sockaddr_in! addr host port)
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(cb addr)))))
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(define (udpsock-bind sock host port)
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(build-sockaddr_in
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host port
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(lambda (addr)
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(bind
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sock
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(ftype-pointer-address addr)
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(ftype-sizeof sockaddr_in)))))
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(define (udpsock-io sock fx)
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(letrec*
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([bufsize 1500] [straddrsize 255]
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[buf (foreign-alloc bufsize)]
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[straddr (make-ftype-pointer char
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(foreign-alloc straddrsize))]
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[addrlen (make-ftype-pointer socklen_t
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(foreign-alloc (ftype-sizeof socklen_t)))]
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[_ (ftype-set! socklen_t () addrlen (ftype-sizeof sockaddr_in))]
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[addr (make-ftype-pointer
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sockaddr_in
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(foreign-alloc (ftype-sizeof sockaddr_in)))]
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[loop (lambda (ifx) (cond ((ifx) (loop ifx)) (#t #t)))])
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(loop
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(lambda ()
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(let ([nread (recvfrom sock buf bufsize 'MSG_DEFAULT addr addrlen)])
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(fx
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(inet_ntop
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'AF_INET
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(ftype-pointer-address
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(ftype-&ref sockaddr_in (addr) addr))
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straddr
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straddrsize)
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(ntohs (ftype-ref sockaddr_in (port) addr))
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buf
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nread
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(lambda (host port sendbuf sendbuflen)
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(configure-sockaddr_in! addr host port)
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(sendto sock sendbuf sendbuflen 'MSG_DEFAULT addr (ftype-sizeof sockaddr_in))
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)))))
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(foreign-free (ftype-pointer-address straddr))
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(foreign-free (ftype-pointer-address addrlen))
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(foreign-free (ftype-pointer-address addr))
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(foreign-free buf)))
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