219 lines
8.9 KiB
Racket
219 lines
8.9 KiB
Racket
#lang racket/unit
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;; Version 0.2
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;; Version 0.1a
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;; Micah Flatt
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;; 06-06-2002
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(require racket/date racket/file racket/port racket/tcp "ftp-sig.rkt")
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(import)
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(export ftp^)
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;; opqaue record to represent an FTP connection:
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(define-struct ftp-connection (in out))
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(define tzoffset (date-time-zone-offset (seconds->date (current-seconds))))
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(define re:multi-response-start #rx#"^[0-9][0-9][0-9]-")
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(define re:response-end #rx#"^[0-9][0-9][0-9] ")
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(define (check-expected-result line expected)
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(when expected
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(unless (ormap (lambda (expected)
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(bytes=? expected (subbytes line 0 3)))
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(if (bytes? expected)
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(list expected)
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expected))
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(error 'ftp "exected result code ~a, got ~a" expected line))))
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;; ftp-check-response : input-port output-port bytes-or-byteslist-or-#f (bytes any -> any) any -> any
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;;
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;; Checks a standard-format response, checking for the given
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;; expected 3-digit result code if expected is not #f.
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;;
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;; While checking, the function sends response lines to
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;; diagnostic-accum. This function -accum functions can return a
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;; value that accumulates over multiple calls to the function, and
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;; accum-start is used as the initial value. Use `void' and
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;; `(void)' to ignore the response info.
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;;
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;; If an unexpected result is found, an exception is raised, and the
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;; stream is left in an undefined state.
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(define (ftp-check-response tcpin tcpout expected diagnostic-accum accum-start)
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(flush-output tcpout)
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(let ([line (read-bytes-line tcpin 'any)])
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(cond
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[(eof-object? line)
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(error 'ftp "unexpected EOF")]
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[(regexp-match re:multi-response-start line)
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(check-expected-result line expected)
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(let ([re:done (regexp (format "^~a " (subbytes line 0 3)))])
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(let loop ([accum (diagnostic-accum line accum-start)])
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(let ([line (read-bytes-line tcpin 'any)])
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(cond [(eof-object? line)
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(error 'ftp "unexpected EOF")]
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[(regexp-match re:done line)
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(diagnostic-accum line accum)]
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[else
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(loop (diagnostic-accum line accum))]))))]
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[(regexp-match re:response-end line)
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(check-expected-result line expected)
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(diagnostic-accum line accum-start)]
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[else
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(error 'ftp "unexpected result: ~e" line)])))
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(define (get-month month-bytes)
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(cond [(assoc month-bytes
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'((#"Jan" 1) (#"Feb" 2) (#"Mar" 3) (#"Apr" 4) (#"May" 5)
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(#"Jun" 6) (#"Jul" 7) (#"Aug" 8) (#"Sep" 9) (#"Oct" 10)
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(#"Nov" 11) (#"Dec" 12)))
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=> cadr]
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[else (error 'get-month "bad month: ~s" month-bytes)]))
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(define (bytes->number bytes)
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(string->number (bytes->string/latin-1 bytes)))
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(define re:date #rx#"(...) *(.*) (..):(..)|(...) *([0-9]*) +(....)")
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(define (ftp-make-file-seconds ftp-date-str)
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(let ([date-list (regexp-match re:date (string->bytes/locale ftp-date-str))])
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(if (not (list-ref date-list 4))
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(find-seconds 0
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0
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2
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(bytes->number (list-ref date-list 6))
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(get-month (list-ref date-list 5))
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(bytes->number (list-ref date-list 7)))
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(+ (find-seconds 0
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(bytes->number (list-ref date-list 4))
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(bytes->number (list-ref date-list 3))
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(bytes->number (list-ref date-list 2))
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(get-month (list-ref date-list 1))
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2002)
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tzoffset))))
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(define re:passive #rx#"\\((.*),(.*),(.*),(.*),(.*),(.*)\\)")
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(define (establish-data-connection tcp-ports)
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(fprintf (ftp-connection-out tcp-ports) "PASV\n")
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(let ([response (ftp-check-response
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(ftp-connection-in tcp-ports)
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(ftp-connection-out tcp-ports)
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#"227"
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(lambda (s ignore) s) ; should be the only response
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(void))])
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(let* ([reg-list (regexp-match re:passive response)]
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[pn1 (and reg-list
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(bytes->number (list-ref reg-list 5)))]
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[pn2 (bytes->number (list-ref reg-list 6))])
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(unless (and reg-list pn1 pn2)
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(error 'ftp "can't understand PASV response: ~e" response))
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(let-values ([(tcp-data tcp-data-out)
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(tcp-connect (format "~a.~a.~a.~a"
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(list-ref reg-list 1)
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(list-ref reg-list 2)
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(list-ref reg-list 3)
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(list-ref reg-list 4))
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(+ (* 256 pn1) pn2))])
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(fprintf (ftp-connection-out tcp-ports) "TYPE I\n")
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(ftp-check-response (ftp-connection-in tcp-ports)
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(ftp-connection-out tcp-ports)
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#"200" void (void))
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(close-output-port tcp-data-out)
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tcp-data))))
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;; Used where version 0.1a printed responses:
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(define (print-msg s ignore)
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;; (printf "~a\n" s)
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(void))
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(define (ftp-establish-connection* in out username password)
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(ftp-check-response in out #"220" print-msg (void))
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(display (bytes-append #"USER " (string->bytes/locale username) #"\n") out)
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(let ([no-password? (ftp-check-response
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in out (list #"331" #"230")
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(lambda (line 230?)
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(or 230? (regexp-match #rx#"^230" line)))
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#f)])
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(unless no-password?
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(display (bytes-append #"PASS " (string->bytes/locale password) #"\n")
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out)
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(ftp-check-response in out #"230" void (void))))
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(make-ftp-connection in out))
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(define (ftp-establish-connection server-address server-port username password)
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(let-values ([(tcpin tcpout) (tcp-connect server-address server-port)])
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(ftp-establish-connection* tcpin tcpout username password)))
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(define (ftp-close-connection tcp-ports)
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(fprintf (ftp-connection-out tcp-ports) "QUIT\n")
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(ftp-check-response (ftp-connection-in tcp-ports)
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(ftp-connection-out tcp-ports)
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#"221" void (void))
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(close-input-port (ftp-connection-in tcp-ports))
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(close-output-port (ftp-connection-out tcp-ports)))
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(define (filter-tcp-data tcp-data-port regular-exp)
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(let loop ()
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(let ([theline (read-bytes-line tcp-data-port 'any)])
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(cond [(or (eof-object? theline) (< (bytes-length theline) 3))
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null]
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[(regexp-match regular-exp theline)
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=> (lambda (m) (cons (cdr m) (loop)))]
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[else
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;; ignore unrecognized lines?
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(loop)]))))
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(define (ftp-cd ftp-ports new-dir)
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(display (bytes-append #"CWD " (string->bytes/locale new-dir) #"\n")
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(ftp-connection-out ftp-ports))
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(ftp-check-response (ftp-connection-in ftp-ports)
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(ftp-connection-out ftp-ports)
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#"250" void (void)))
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(define re:dir-line
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#rx#"^(.)......... .* ([A-Z].* .* [0-9][0-9]:?[0-9][0-9]) (.*)$")
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(define (ftp-directory-list tcp-ports)
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(let ([tcp-data (establish-data-connection tcp-ports)])
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(fprintf (ftp-connection-out tcp-ports) "LIST\n")
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(ftp-check-response (ftp-connection-in tcp-ports)
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(ftp-connection-out tcp-ports)
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(list #"150" #"125") void (void))
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(let ([dir-list (filter-tcp-data tcp-data re:dir-line)])
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(close-input-port tcp-data)
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(ftp-check-response (ftp-connection-in tcp-ports)
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(ftp-connection-out tcp-ports)
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#"226" print-msg (void))
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(map (lambda (l) (map bytes->string/locale l)) dir-list))))
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(define (ftp-download-file tcp-ports folder filename)
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;; Save the file under the name tmp.file, rename it once download is
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;; complete this assures we don't over write any existing file without
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;; having a good file down
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(let* ([tmpfile (make-temporary-file
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(string-append
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(regexp-replace
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#rx"~"
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(path->string (build-path folder "ftptmp"))
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"~~")
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"~a"))]
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[new-file (open-output-file tmpfile #:exists 'replace)]
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[tcpstring (bytes-append #"RETR "
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(string->bytes/locale filename)
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#"\n")]
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[tcp-data (establish-data-connection tcp-ports)])
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(display tcpstring (ftp-connection-out tcp-ports))
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(ftp-check-response (ftp-connection-in tcp-ports)
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(ftp-connection-out tcp-ports)
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(list #"125" #"150") print-msg (void))
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(copy-port tcp-data new-file)
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(close-output-port new-file)
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(close-input-port tcp-data)
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(ftp-check-response (ftp-connection-in tcp-ports)
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(ftp-connection-out tcp-ports)
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#"226" print-msg (void))
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(rename-file-or-directory tmpfile (build-path folder filename) #t)))
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;; (printf "FTP Client Installed...\n")
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