/usr/share/gauche-0.9/0.9.1/lib/rfc/ftp.scm is in gauche 0.9.1-5.
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;;;
;;; Copyright (c) 2005 OOHASHI Daichi, All rights reserved.
;;; Copyright (c) 2007-2010 Shiro Kawai <shiro@acm.org>
;;;
;;; Redistribution and use in source and binary forms, with or without
;;; modification, are permitted provided that the following conditions
;;; are met:
;;;
;;; 1. Redistributions of source code must retain the above copyright
;;; notice, this list of conditions and the following disclaimer.
;;;
;;; 2. Redistributions in binary form must reproduce the above copyright
;;; notice, this list of conditions and the following disclaimer in the
;;; documentation and/or other materials provided with the distribution.
;;;
;;; 3. Neither the name of the authors nor the names of its contributors
;;; may be used to endorse or promote products derived from this
;;; software without specific prior written permission.
;;;
;;; THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
;;; "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
;;; LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
;;; A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
;;; OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
;;; SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
;;; TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
;;; PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
;;; LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
;;; NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
;;; SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
;;;
;; RFC 959 FILE TRANSFER PROTOCOL (FTP)
;; RFC 1123 Requirements for Internet Hosts -- Application and Support
;; RFC 2428 FTP Extensions for IPv6 and NATs
(define-module rfc.ftp
(use srfi-1)
(use srfi-13)
(use srfi-19)
(use rfc.uri)
(use util.list)
(use gauche.net)
(use gauche.logger)
(export <ftp-connection> <ftp-error> call-with-ftp-connection
ftp-chdir ftp-current-directory ftp-get ftp-size
ftp-help ftp-list ftp-login ftp-ls ftp-mdtm ftp-mtime
ftp-mkdir ftp-name-list ftp-noop ftp-passive? ftp-put
ftp-put-unique ftp-quit ftp-remove ftp-rename ftp-rmdir
ftp-site ftp-stat ftp-system ftp-transfer-type
))
(select-module rfc.ftp)
(define-constant *default-ftp-port* 21)
(define-constant *anon-user* "anonymous")
(define-constant *anon-pass* "anonymous@")
(define-class <ftp-connection> ()
((transfer-type :init-value 'binary
:init-keyword :transfer-type
:accessor ftp-transfer-type)
(passive :init-keyword :passive
:getter ftp-passive?)
(log-drain :init-keyword :log-drain
:init-value #f)
(socket :init-keyword :socket)))
(define (call-with-ftp-connection uri proc . keys)
(receive (user host port) (uri-decompose-authority uri)
(let1 conn (apply ftp-login host
(cond-list
[user @ (list :username user)]
[port @ (list :port port)]
[#t @ keys]))
(unwind-protect (proc conn)
(ftp-quit conn)))))
;; rfc 959 6(5) type commands
;; USER <SP> <username> <CRLF>
;; PASS <SP> <password> <CRLF>
;; ACCT <SP> <account-information> <CRLF>
(define (ftp-login host :key (account "") (passive #f)
(port *default-ftp-port*) (username *anon-user*)
(password (if (string=? username *anon-user*) *anon-pass* ""))
(log-drain #f))
(define (do-login conn)
(let retry ()
(if (string-prefix? "120" (get-response conn))
(begin (sys-sleep 1) (retry))
(let1 r1 (send-command conn "USER" username)
(if (not (string-prefix? "3" r1))
r1
(let1 r2 (send-command conn "PASS" password)
(if (not (string-prefix? "3" r2))
r2
(send-command conn "ACCT" account))))))))
(let* ((conn (make <ftp-connection>
:passive passive
:socket (make-client-socket 'inet host port)
:log-drain log-drain))
(res (do-login conn)))
(if (not (string-prefix? "2" res))
(ftp-error res)
conn)))
;; rfc 959 6(1) type commands
;; QUIT <CRLF>
(define (ftp-quit conn)
(unwind-protect
(simple-command conn "QUIT")
(if-let1 s (ref conn 'socket)
(begin (socket-shutdown s) (set! (ref conn 'socket) #f)))))
;; *ABOR <CRLF>
;; *ALLO <SP> <decimal-integer> [<SP> R <SP> <decimal-integer>] <CRLF>
;; CWD <SP> <pathname> <CRLF>
;; CDUP <CRLF>
(define (ftp-chdir conn dirname)
(if (string=? dirname "..")
(simple-command conn "CDUP")
(simple-command conn "CWD" dirname)))
;; DELE <SP> <pathname> <CRLF>
(define (ftp-remove conn path) (simple-command conn "DELE" path))
;; HELP [<SP> <string>] <CRLF>
(define (ftp-help conn . opt) (apply simple-command conn "HELP" opt))
;; MKD <SP> <pathname> <CRLF>
;; PWD <CRLF>
(define (ftp-mkdir conn dirname)(parse-257 (simple-command conn "MKD" dirname)))
(define (ftp-current-directory conn) (parse-257 (simple-command conn "PWD")))
(define (parse-257 res)
(rxmatch-if (#/^257 \"((?:[^\"]|\"\")+)\"/ res) (_ dirname)
(regexp-replace-all #/""/ dirname "\"")
(ftp-error res)))
;; *MODE <SP> <mode-code> <CRLF>
;; *SMNT <SP> <pathname> <CRLF>
;; SITE <SP> <string> <CRLF>
(define (ftp-site conn arg) (simple-command conn "SITE" arg))
;; *STRU <SP> <structure-code> <CRLF>
;; RMD <SP> <pathname> <CRLF>
(define (ftp-rmdir conn dirname) (simple-command conn "RMD" dirname))
;; STAT [<SP> <pathname>] <CRLF>
(define (ftp-stat conn . opt) (apply simple-command conn "STAT" opt))
;; SYST <CRLF>
(define (ftp-system conn) (string-drop (simple-command conn "SYST") 4))
;; SIZE
(define (ftp-size conn path)
(ftp-set-type conn) ; SIZE is affected by transfer type
(x->integer (string-drop (simple-command conn "SIZE" path) 4)))
;; MDTM
(define (ftp-mdtm conn path) (simple-command conn "MDTM" path))
(define (ftp-mtime conn path :optional (local-time? #f))
(rxmatch-let (#/(\d{4})(\d\d)(\d\d)(\d\d)(\d\d)(\d\d)/ (ftp-mdtm conn path))
(#f year month day hour min sec)
(date->time-utc
(make-date 0 (x->integer sec) (x->integer min) (x->integer hour)
(x->integer day) (x->integer month) (x->integer year)
(if local-time? (date-zone-offset (current-date)) 0)))))
;; NOOP <CRLF>
(define (ftp-noop conn) (simple-command conn "NOOP"))
;;; rfc 959 6(2) type command
;; *APPE <SP> <pathname> <CRLF>
;; LIST [<SP> <pathname>] <CRLF>
;; NLST [<SP> <pathname>] <CRLF>
(define (make-lister cmd)
(lambda (conn . opt)
(req&recv conn
(cut apply send-command conn cmd opt)
(cut port->string-list <>)
'ascii)))
(define ftp-list (make-lister "LIST"))
(define ftp-name-list (make-lister "NLST"))
(define ftp-ls ftp-name-list)
;; *REIN <CRLF>
;; *REST <SP> <marker> <CRLF>
;; RETR <SP> <pathname> <CRLF>
(define (ftp-get conn path :key (sink (open-output-string))
(flusher get-output-string))
(req&recv conn
(cut send-command conn "RETR" path)
(lambda (in) (copy-port in sink) (flusher sink))))
;; STOR <SP> <pathname> <CRLF>
(define (ftp-put conn from-file :optional (to-file (sys-basename from-file)))
(values-ref
(call-with-input-file from-file
(cute req&send conn (cut send-command conn "STOR" to-file) <>))
0))
;; STOU <CRLF>
(define (ftp-put-unique conn from-file)
(call-with-input-file from-file
(cute req&send conn (cut send-command conn "STOU") <>)))
;;; rfc 959 6(3) type commands
;; RNFR <SP> <pathname> <CRLF>
;; RNTO <SP> <pathname> <CRLF>
(define (ftp-rename conn from to)
(let1 res1 (send-command conn "RNFR" from)
(if (not (string-prefix? "3" res1))
(ftp-error res1)
(let1 res2 (send-command conn "RNTO" to)
(if (not (string-prefix? "2" res2))
(ftp-error res2)
res2)))))
;; private utilities
;; PORT <SP> <host-port> <CRLF>
;; EPRT <SP> <d><net-prt><d><net-addr><d><tcp-port><d> <CRLF>
;; PASV <CRLF>
;; EPSV <SP> <net-prt> <CRLF>
;; open data connection to server and pass it to proc.
(define (call-with-data-connection conn proc)
;; returns a thunk to create data connection socket, and a thunk to
;; clean up.
(define (dcsock)
(if (ftp-passive? conn)
(if (ipv4? conn)
(parse-227 (simple-command conn "PASV"))
(parse-229 (simple-command conn "EPSV")))
(make-asock)))
(define (ipv4? conn)
(is-a? (socket-address (ref conn 'socket)) <sockaddr-in>))
(define (parse-227 res)
(if (not (string-prefix? "227" res))
(ftp-error res)
(rxmatch-let (#/\((\d+),(\d+),(\d+),(\d+),(\d+),(\d+)\)/ res)
(#f h1 h2 h3 h4 p1 p2)
(let1 ds (make-client-socket 'inet
(string-join (list h1 h2 h3 h4) ".")
(+ (* 256 (x->integer p1))
(x->integer p2)))
(values (lambda () ds)
(lambda () (socket-shutdown ds 2)))))))
(define (parse-229 res)
(if (not (string-prefix? "229" res))
(ftp-error res)
(rxmatch-let (#/\((.+?)\)/ res) (#f s)
(let1 d (regexp-quote (substring s 0 1))
(rxmatch-let ((string->regexp #`",d,d,d([^,d]+),d") s) (#f port)
(let1 ds (make-client-socket
'inet
(sockaddr-addr (socket-address (ref conn 'socket)))
(string->number port))
(values (lambda () ds)
(lambda () (socket-shutdown ds 2)))))))))
(define (make-asock)
(let* ((asock (make-server-socket (make (class-of
(socket-address (ref conn 'socket)))
:host "localhost")))
(psname (sockaddr-name (socket-address asock))))
(if (ipv4? conn)
(rxmatch-let (#/(\d+)\.(\d+)\.(\d+)\.(\d+):(\d+)/ psname)
(#f a b c d p)
(receive (q r) (quotient&remainder (string->number p) 256)
(simple-command conn
"PORT"
(format #f "~A,~A,~A,~A,~A,~A" a b c d q r))))
(rxmatch-let (#/\[(.+?)\]:(\d+)/ psname) (#f host port)
(simple-command conn
"EPRT"
(format #f "|2|~A|~A|" host port))))
(let ((ds #f))
(values (lambda () (set! ds (socket-accept asock)) ds)
(lambda ()
(when ds (socket-shutdown ds 2))
(socket-shutdown asock 2))))))
(receive (sock-thunk cleanup-thunk) (dcsock)
(unwind-protect (proc sock-thunk) (cleanup-thunk))))
;; error reporting routine.
;; it should be raise conditon with respect to the response code.
(define-condition-type <ftp-error> <error> #f)
(define (ftp-error res . args)
(apply error <ftp-error> res args))
;; send ftp command
(define (send-command conn cmd . args)
(let ((out (socket-output-port (ref conn 'socket)))
(log (ref conn 'log-drain))
(msg (with-output-to-string
(lambda ()
(display cmd)
(for-each (lambda (arg) (display " ") (display arg)) args)))))
(display msg out) (display "\r\n" out) (flush out)
(when log
(if (equal? cmd "PASS")
(log-format log ">>> PASS *****") ;; do not log password
(log-format log ">>> ~a" msg)))
(get-response conn)))
;; send rfc-959 6(2) type command
(define (simple-command conn cmd . args)
(let1 res (apply send-command conn cmd args)
(if (string-prefix? "2" res)
res
(ftp-error res))))
;; receive response from server
(define (get-response conn)
(define (get-resp in)
(let1 l (read-line in)
(rxmatch-if (#/^(\d\d\d)-/ l) (#f code)
(let loop ((rs (list l))
(line (read-line in)))
(if (and (string-prefix? code line)
(char=? (string-ref line 3) #\space))
(string-concatenate-reverse rs)
(loop (cons* line "\n" rs) (read-line in))))
l)))
(let1 res (get-resp (socket-input-port (ref conn 'socket)))
(cond ((ref conn 'log-drain) => (cut log-format <> "<<< ~a" res)))
(if (#/^[45]/ res)
(ftp-error res)
res)))
;; TYPE <SP> <type-code> <CRLF>
(define (ftp-set-type conn :optional (type (ftp-transfer-type conn)))
(simple-command conn "TYPE"
(case type
[(ascii) "A"]
[(binary image) "I"]
[else (error "Invalid transfer type:" type)])))
;; requrest server to send data and receive it
(define (req&recv conn cmdproc reader . opt)
(apply ftp-set-type conn opt)
(call-with-data-connection conn
(lambda (get-data-socket)
(let1 res (cmdproc)
(if (not (string-prefix? "1" res))
(ftp-error res)
(begin0
(let1 s (get-data-socket)
(unwind-protect (reader (socket-input-port s))
(socket-close s)))
(let1 res2 (get-response conn)
(when (not (string-prefix? "2" res2))
(ftp-error res2)))))))))
;; request server to receive data and send data
(define (req&send conn cmdproc port)
(define (copy-data get-data-socket)
(copy-port port (socket-output-port (get-data-socket))))
(define (send-data)
(call-with-data-connection conn
(lambda (get-data-socket)
(let1 res (cmdproc)
(rxmatch-case res
[#/^1\d\d FILE: (.+)$/ (#f dst-path)
;; RFC 1123 - 4.1.2.9 STOU Command: RFC-959 Section 4.1.3
(copy-data get-data-socket) dst-path]
[#/^1/ ()
;; in case if the server doesn't conform RFC1123
(copy-data get-data-socket) #f]
[else (ftp-error res)])))))
(define (retrieve-response res dst-path)
(rxmatch-case res
[#/^2/ () (values res dst-path)]
; vsftpd duplicates the 1XX reply for STOU.
[#/^1/ () (retrieve-response (get-response conn) dst-path)]
[else (ftp-error res)]))
(ftp-set-type conn)
(let1 dst-path (send-data)
(retrieve-response (get-response conn) dst-path)))
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