/
ftpd.cl
1886 lines (1602 loc) · 55.8 KB
/
ftpd.cl
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;; This software is Copyright (c) Franz Inc., 2001-2012.
;; Franz Inc. grants you the rights to distribute
;; and use this software as governed by the terms
;; of the Lisp Lesser GNU Public License
;; (http://opensource.franz.com/preamble.html),
;; known as the LLGPL.
(in-package :user)
(defvar *ftpd-version* "1.1.3")
(eval-when (compile)
(proclaim '(optimize (safety 1) (space 1) (speed 3) (debug 2))))
(eval-when (compile eval load)
;; upload errors indicate this is needed
(require :disasm)
(require :regexp)
(require :efmacs)
(require :osi)
(use-package :excl.osi)
;; Needed for proper error reporting.
(setf excl::*strict-probe-file* t))
(eval-when (compile)
(if (shadow-passwd-supported-p)
(push :shadow-passwd-supported-p *features*)))
;; Location of the configuration files (which one can use to
;; override the rest of these parameters).
(defparameter *configfile* "/etc/aftpd.cl")
(eval-when (compile load eval)
(defparameter *extra-files* '("ipaddr")))
(eval-when (compile)
(dolist (source *extra-files*)
(compile-file-if-needed
(concatenate 'string source ".cl"))))
(eval-when (compile load eval)
(dolist (file *extra-files*)
(load (concatenate 'string file ".fasl")))
(require :acldns))
(eval-when (compile load eval)
(defparameter *extfcrlf*
(find-composed-external-format :e-crlf (crlf-base-ef :latin1))))
(defmacro with-umask ((newumask) &body body)
(let ((oldumasksym (gensym)))
`(let ((,oldumasksym (umask ,newumask)))
(unwind-protect
(progn ,@body)
(umask ,oldumasksym)))))
(defclass client ()
((sock :initarg :sock :reader client-sock)
(type :initform :ascii-nonprint :accessor client-type)
(mode :initform :stream)
(stru :initform :file)
(logged-in :initform nil :accessor logged-in)
(attempts :initform 0 :accessor attempts)
(user :initform nil :accessor user)
(pwent :initform nil :accessor pwent)
(anonymous :initform nil :accessor anonymous)
(pwd :accessor pwd)
(addr :initform nil :accessor dataport-addr)
(port :initform nil :accessor dataport-port)
(pasv :initform nil :accessor pasv) ;; holds pasv server socket
(open :initform nil :accessor dataport-open)
(dsock :initform nil :accessor dataport-sock) ;; holds a connected socket
(restart :initform 0 :accessor client-restart)
(umask :initform *default-umask* :accessor client-umask)
(rename-from :initform nil :accessor rename-from)
(message-seen :initform (make-hash-table :test #'equal)
:accessor message-seen)
(restricted :initform nil :accessor restricted)))
(defstruct cmd
command
implemented
must-be-logged-in
handler)
(defparameter *cmds* (make-hash-table :test #'equalp))
(dolist (entry
'(;; Login
("user" t nil cmd-user)
("pass" t nil cmd-pass)
("acct" nil nil nil)
;; Logout
("rein" nil nil nil)
("quit" t nil cmd-quit)
;; Transfer parameters
("port" t t cmd-port)
("pasv" t t cmd-pasv)
("mode" t t cmd-mode)
("type" t t cmd-type)
("stru" t t cmd-stru)
;; File action commands
("allo" t t cmd-allo)
("rest" t t cmd-rest)
("stor" t t cmd-stor)
("stou" nil t nil)
("retr" t t cmd-retr)
("list" t t cmd-list)
("nlst" t t cmd-nlst)
("appe" t t cmd-appe)
("rnfr" t t cmd-rnfr)
("rnto" t t cmd-rnto)
("dele" t t cmd-dele)
("rmd" t t cmd-rmd)
("xrmd" t t cmd-rmd)
("mkd" t t cmd-mkd)
("xmkd" t t cmd-mkd)
("pwd" t t cmd-pwd)
("xpwd" t t cmd-pwd)
("abor" t t cmd-abor)
("cwd" t t cmd-cwd)
("xcwd" t t cmd-cwd)
("cdup" t t cmd-cdup)
("xcup" t t cmd-cdup)
("smnt" nil nil nil)
("mdtm" t t cmd-mdtm)
("size" t t cmd-size)
;; Informational commands
("syst" t t cmd-syst)
("stat" t t cmd-stat)
("help" t t cmd-help)
;; Miscellaneous commands
("site" t t cmd-site)
("noop" t t cmd-noop)))
(setf (gethash (first entry) *cmds*)
(make-cmd
:command (first entry)
:implemented (second entry)
:must-be-logged-in (third entry)
:handler (fourth entry))))
(defparameter *sitecmds*
'(("chmod" . site-chmod)
("umask" . site-umask)
("utime" . site-utime)))
(defparameter *logstream* nil)
(defparameter *xferlogstream* nil)
(defun main-loop ()
(let ((serv (socket:make-socket :connect :passive
:local-host *interface*
:local-port *ftpport*
:reuse-address t)))
(setq socket:*dns-mode* '(:acldns))
(socket:configure-dns :auto t)
(unwind-protect
(loop
(let ((client (handler-case (socket:accept-connection serv)
(interrupt-signal () (exit))
(error () nil))))
(when client (spawn-client client serv))))
;; cleanup forms
(close serv))))
(defmacro with-fork (pidsym parent-form child-form)
`(let ((,pidsym (fork)))
(cond
((< ,pidsym 0) (error "fork failed!"))
((> ,pidsym 0) ;; parent
,parent-form)
((= ,pidsym 0) ;; child
,child-form))))
;; In case I can't get a decent SIGCHLD handler.
(defmacro with-orphaned-child (&body body)
(let ((pidsym (gensym))
(pidsym2 (gensym)))
`(with-fork ,pidsym
;; parent form
(waitpid ,pidsym) ;; reap child
;; child form
(with-fork ,pidsym2
;; parent exits to orphan child. (init will reap it)
(exit t :no-unwind t :quiet t)
;; child does what it needs to do.
(progn
,@body
(exit t :no-unwind t :quiet t))))))
(defun spawn-client (sock serv)
(with-orphaned-child
(close serv) ;; child doesn't need it.
(add-pid)
(unwind-protect
(ftpd-main sock)
(ignore-errors (close sock :abort t))))
;; child never gets here. Parent does.
;; main ftp server doesn't need this
(close sock))
(defmacro with-pids-file ((stream-sym pids-list-sym) &body body)
`(with-open-file (,stream-sym *pidsfile*
:if-exists :overwrite
:if-does-not-exist :create
:direction :io)
(with-stream-lock (,stream-sym)
(let ((,pids-list-sym (read ,stream-sym nil nil)))
,@body
(file-position ,stream-sym 0)
(format ,stream-sym "~A~%" ,pids-list-sym)))))
(defun add-pid ()
(with-pids-file (f pids)
(pushnew (getpid) pids)))
;; returns the number of active pids.
;; also updates the pids file w/ the active list.
(defun probe-pids-file ()
(let (active)
(with-pids-file (f pids)
(dolist (pid pids)
(when (handler-case (kill pid 0)
(error () nil))
(push pid active)))
(setf pids active))
(length active)))
;;; Logging
(defconstant *log-open-flags*
(logior *o-wronly* *o-append* *o-creat*))
(defun open-logs ()
(setf *logstream*
(if* *debug*
then *standard-output*
else (os-open *logfile* *log-open-flags* #o600)))
(setf *xferlogstream*
(if* *debug*
then *standard-output*
else (os-open *xferlog* *log-open-flags* #o0600))))
(defun close-logs ()
(when (not *debug*)
(close *logstream*)
(close *xferlogstream*)))
(defmacro with-open-logs (() &body body)
`(progn
(open-logs)
(unwind-protect (progn ,@body)
(ignore-errors (close-logs)))))
(defun ftp-log (&rest args)
(format *logstream* "~A [~D]: ~?"
(ctime)
(getpid)
(first args)
(rest args))
(force-output *logstream*))
(defun ftp-log-client (client format &rest args)
(apply #'ftp-log
(concatenate 'string "~a: " format)
(socket:ipaddr-to-dotted (socket:remote-host (client-sock client)))
args))
(defun xfer-log (client fullpath direction bytes)
(format *xferlogstream*
"(~A ~A ~S ~S ~D ~S) ;; ~A ~A ~%"
(get-universal-time)
(socket:remote-host (client-sock client))
fullpath
direction
bytes
(if (anonymous client)
(anonymous client)
(user client))
(socket:ipaddr-to-dotted (socket:remote-host (client-sock client)))
(ctime))
(force-output *xferlogstream*))
;;;
(defparameter *outlinestream* 'outlinestream-not-bound)
;; never call outline w/ a first argument that is anything
;; but a format string. This macro checks for that situation
;; to be safe.
(defmacro outline (format-string &rest args)
(let ((ressym (gensym)))
(when (not (stringp format-string))
(error "Crikey, format-string is not a string constant: ~s."
format-string))
`(let ((,ressym (format nil ,format-string ,@args)))
(if (eq *debug* :verbose)
(ftp-log "~A~%" ,ressym))
(write-string ,ressym *outlinestream*)
(write-char #\return *outlinestream*)
(write-char #\newline *outlinestream*)
(force-output *outlinestream*))))
;;;
(defun spawn-command (cmdvec &key env)
(if (not (vectorp cmdvec))
(error "Ack!! non-vector passed to spawn-command"))
(multiple-value-bind (stdout stderr pid)
(run-shell-command cmdvec
:input "/dev/null"
:output :stream
:error-output :stream
:environment env
:wait nil)
(mp:process-run-function "stderr reader" 'stderr-reader stderr)
(values stdout pid)))
(defun stderr-reader (stderr)
(unwind-protect
(let (line)
(while (setf line (read-line stderr nil nil))
(ftp-log "~A~%" line)))
(ignore-errors (close stderr))))
(defmacro with-external-command ((streamvar cmdvec &key env) &body body)
(let ((pidvar (gensym)))
`(multiple-value-bind (,streamvar ,pidvar)
(spawn-command ,cmdvec :env ,env)
(unwind-protect (progn ,@body)
(close ,streamvar)
(sys:reap-os-subprocess :pid ,pidvar)))))
;;;
(defconstant *telnetIAC* 255)
;;(defconstant *telnetIP* 244)
;;(defconstant *telnetSynch* 242)
(defparameter *maxline* 5000)
(defun get-request (client)
(let ((sock (client-sock client))
(buffer (make-string *maxline*))
(pos 0)
lastchar
gotiac
longline
char)
(mp:with-timeout (*idletimeout* :timeout)
(loop
(if (>= pos *maxline*)
(progn
(setf longline t)
(setf pos 0)))
(setf char
(handler-case (read-char sock)
(error ()
nil)))
(if (null char)
(return :eof))
(if (and (char= char #\newline) (eq lastchar #\return))
(return (if longline
:line-too-long
(subseq buffer 0 (1- pos)))))
;;; XXX -- telnet sequences. Stripped and ignored.
;;; XXX -- (two-byte sequences, only)
(if* gotiac
then
(setf gotiac nil)
(if (= (char-code char) *telnetIAC*)
(progn
;; escaped #xff
(setf (schar buffer pos) char)
(incf pos)
(setf lastchar char)))
else
(if (= (char-code char) *telnetIAC*)
(setf gotiac t)
(progn
;; Regular stuff
(setf (schar buffer pos) char)
(incf pos)
(setf lastchar char))))))))
(defun ftpd-main (sock)
;; Load latest configuration
(load-config-file)
;; Freshen log stream (to allow for log rotation).
(close-logs)
(with-open-logs ()
;; Each connection should have its own random state (used by
;; the PASV command to generate port numbers.
(make-random-state t)
(let ((client (make-instance 'client :sock sock))
(*outlinestream* sock)
(*locale* (find-locale :c))
(*print-pretty* nil))
(ftp-log-client client "Connected~%")
(handler-bind
;; FIXME: Don't backtrace on socket errors
((error #'(lambda (e)
(let ((backtrace
(with-output-to-string (s)
(format s "Unhandled error: ~a~%" e)
(format s "Backtrace:~%")
(top-level.debug:zoom s :count nil :all t))))
(ftp-log-client client "~a~%" backtrace))
(return-from ftpd-main))))
(umask (client-umask client))
(outline "220 ~A" *banner*)
(loop
(let ((req (get-request client)))
(if (eq req :eof)
(return (cleanup client "Disconnected")))
(if* (eq req :timeout)
then
(ignore-errors ;; in case the connection disappeared
(outline "421 Timeout: closing control connection."))
(return (cleanup client "Timeout")))
(if (eq req :line-too-long)
(outline "500 Command line too long! Request ignored")
(if (eq (dispatch-cmd client req) :quit)
(return (cleanup client "QUIT"))))))))))
(defun dispatch-cmd (client cmdstring)
(block nil
(let ((spacepos (position #\space cmdstring))
cmdname
entry)
(if (null spacepos)
(setf cmdname cmdstring)
(setf cmdname (subseq cmdstring 0 spacepos)))
(if (and (not (anonymous client))
(equalp cmdname "pass"))
(ftp-log-client client "PASS XXXXXX~%")
(ftp-log-client client "~A~%" cmdstring))
(setf entry (gethash cmdname *cmds*))
(if (null entry)
(return (outline "500 '~A': command not understood." cmdstring)))
(if (not (cmd-implemented entry))
(return (outline "502 ~A command not implemented." cmdname)))
(if (and (cmd-must-be-logged-in entry)
(not (logged-in client)))
(return (outline "530 Please login with USER and PASS.")))
(funcall (cmd-handler entry) client
(if spacepos
(subseq cmdstring (1+ spacepos))
"")))))
(defun cleanup (client reason)
(ftp-log-client client "Disconnected (~a).~%" reason)
(cleanup-data-connection client))
(defmacro with-root-privs (() &body body)
(let ((oldidsym (gensym)))
`(let ((,oldidsym (geteuid)))
(seteuid 0)
(unwind-protect
(progn ,@body)
(seteuid ,oldidsym)))))
(defun ftp-chdir (dir)
(handler-case (setq *default-pathname-defaults* (pathname (chdir dir)))
(error (c)
(ftp-log "chdir ~s failed: ~a~%" dir c)
nil)))
(defun cmd-quit (client cmdtail)
(declare (ignore cmdtail client))
(outline "221 Goodbye.")
:quit)
(defun cmd-user (client user)
(block nil
(if (logged-in client)
(return (outline "530 Already logged in.")))
(setf (anonymous client) nil)
(if (and (member user *anonymous-ftp-names* :test #'equalp)
(lookup-account *anonymous-ftp-account*))
(progn
(setf user *anonymous-ftp-account*)
(setf (anonymous client) t)))
(setf (user client) user)
(setf (pwent client) (lookup-account user))
;; XXX - Doesn't allow no-password logins.
(if (anonymous client)
(outline
"331 Guest login ok, send your complete e-mail address as password.")
(outline "331 Password required for ~A." user))))
(defun lookup-account (user)
(block nil
(let ((pwent (getpwnam user)))
(if (null pwent)
(return nil))
#+shadow-passwd-supported-p
(if (string= (pwent-passwd pwent) "x")
(let ((spent (getspnam user)))
(if spent
(setf (pwent-passwd pwent) (spwd-passwd spent)))))
pwent)))
(defun cmd-pass (client pass)
(block nil
(let ((pwent (pwent client))
(numclients (probe-pids-file)))
(if (logged-in client)
(return (outline "530 Already logged in.")))
(if (null (user client))
(return (outline "503 Login with USER first.")))
(if* (and *maxusers* (> numclients *maxusers*))
then
(dump-msg client "530" *toomanymsg*)
(outline "530 Connection limit exceeded.")
(ftp-log-client client "Connection limit (~D) exceeded.~%" *maxusers*)
(return :quit))
(if* (anonymous client)
then (setf (anonymous client) pass)
elseif (or (null pwent) ;; unknown user
;; or not in test mode and password doesn't check out
(and (not *test*)
;; FIXME: Add PAM support
(not (string= (pwent-passwd pwent)
(crypt pass (pwent-passwd pwent))))))
then (ftp-log-client client "Login failed for user ~s~%" (user client))
(setf (user client) nil)
(setf (pwent client) nil)
(sleep *badpwdelay*)
(outline "530 Login incorrect.")
(incf (attempts client))
(return (if (>= (attempts client) *max-password-attempts*) :quit)))
;; Good to go
;; Successful authentication
(ftp-log-client client "Login successful for user ~s~%" (user client))
(setf (pwd client) (pwent-dir pwent))
(if* (anonymous client)
then (anonymous-setup client)
else ;; If *restricted-users* is 't', then all users are
;; restricted except for those in the *unrestricted-users*
;; list. Otherwise, a user is restricted if he/she is
;; listed in *restricted-users*.
(if* (eq *restricted-users* t)
then (if (member (user client) *unrestricted-users*
:test #'string=)
(setf (restricted client) nil)
(setf (restricted client) t))
else (if (member (user client) *restricted-users*
:test #'string=)
(setf (restricted client) t))))
(when (not *test*)
;; Set up
(handler-case (setegid (pwent-gid pwent))
(error (c)
(ftp-log-client client "Failed to setegid(~D): ~a~%" (pwent-gid pwent) c)
(outline "421 Local configuration error.")
(return :quit)))
(handler-case (initgroups (user client) (pwent-gid pwent))
(error (c)
(ftp-log-client client "Failed to initgroups (~a)~%" c)
(outline "421 Local configuration error.")
(return :quit)))
(handler-case (seteuid (pwent-uid pwent))
(error (c)
(ftp-log-client client "Failed to seteuid(~D): ~a~%" (pwent-uid pwent) c)
(outline "421 Local configuration error.")
(return :quit))))
(when (null (ftp-chdir (pwent-dir pwent)))
(ftp-log-client client "Failed to chdir(~A)~%" (pwent-dir pwent))
;; Anonymous/restricted users have no alternative
(when (or (anonymous client) (restricted client))
(outline "421 Local configuration error.")
(return :quit))
(if* (not (ftp-chdir "/"))
then (ftp-log-client client "Failed to chdir(/)~%")
(outline "421 Local configuration error.")
(return :quit)
else (setf (pwent-dir pwent) "/")
(outline "230-No directory! Logging in with home=/")))
(setf (logged-in client) t)
(cleanup-data-connection client)
(dump-msg client "230" *welcome-msg-file*)
(outline "230 User ~A logged in." (user client)))))
(defun anonymous-setup (client)
(block nil
(let ((pwent (pwent client)))
(if (null (ftp-chdir (pwent-dir pwent)))
(progn
(ftp-log-client client "Failed to chdir(~A)~%" (pwent-dir pwent))
(outline "421 Local configuration error.")
(return nil)))
(handler-case (chroot (pwent-dir pwent))
(error (c)
(ftp-log-client client "Failed to chroot(~a): ~a~%" (pwent-dir pwent) c)
(outline "421 Local configuration error.")
(return nil)))
(setf (pwent-dir pwent) "/")
(setf (pwd client) "/")
t)))
(defmacro ftp-with-open-file ((streamsym errsym path &rest rest) &body body)
`(let (,errsym)
(declare (ignore-if-unused ,errsym))
(let ((,streamsym
(handler-case (open ,path ,@rest)
(file-error (c)
(setf ,errsym (excl::syscall-error-errno c))
nil))))
(unwind-protect (progn ,@body)
(if ,streamsym
(close ,streamsym))))))
(defun dump-msg (client code file)
(declare (ignore client))
(block nil
(if (or (null file)
(null (probe-file file)))
(return))
(ftp-with-open-file
(f errno file)
(if f
(let (line)
(while (setf line (read-line f nil nil))
(outline "~A-~A" code line)))))))
(defun cmd-pwd (client cmdtail)
(declare (ignore cmdtail))
(outline "257 \"~A\" is current directory."
(pwd client)))
(defun cmd-noop (client cmdtail)
(declare (ignore client cmdtail))
(outline "200 NOOP command successful."))
(defun cmd-port (client cmdtail)
(block nil
(multiple-value-bind (matched whole a b c d e f)
(match-regexp
"\\([0-9]+\\),\\([0-9]+\\),\\([0-9]+\\),\\([0-9]+\\),\\([0-9]+\\),\\([0-9]+\\)"
cmdtail)
(declare (ignore whole))
(if (not matched)
(return (outline "500 'PORT ~A': command not understood." cmdtail)))
(setf a (parse-integer a))
(setf b (parse-integer b))
(setf c (parse-integer c))
(setf d (parse-integer d))
(setf e (parse-integer e))
(setf f (parse-integer f))
(let ((addr (logior (ash a 24) (ash b 16) (ash c 8) d))
(port (logior (ash e 8) f)))
(if (or (not (= addr (socket:remote-host (client-sock client))))
(< port 1024))
(return
(progn
(ftp-log-client client "Tried to set PORT ~A:~A~%"
(socket:ipaddr-to-dotted addr)
port)
(outline "500 Illegal PORT Command"))))
(cleanup-data-connection client)
(setf (dataport-addr client) addr)
(setf (dataport-port client) port)
(setf (pasv client) nil)
(outline "200 PORT command successful.")))))
(defun cmd-pasv (client cmdtail)
(declare (ignore cmdtail))
(cleanup-data-connection client)
(let (port sock)
(while (null sock)
;; XXX -- this could theoretically loop forever. Need a loop limiter
(setf port
(+ (car *pasvrange*)
(random (1+ (- (cdr *pasvrange*) (car *pasvrange*))))))
(handler-case (setf sock (socket:make-socket
:type :hiper
:connect :passive
:local-host (socket:local-host (client-sock client))
:local-port port))
(socket-error (c)
(if (not (eq (stream-error-identifier c) :address-in-use))
(signal c)
nil))))
(setf (pasv client) sock)
(let ((addr (get-passive-ip-addr client)))
(outline "227 Entering Passive Mode (~D,~D,~D,~D,~D,~D)"
(logand (ash addr -24) #xff)
(logand (ash addr -16) #xff)
(logand (ash addr -8) #xff)
(logand addr #xff)
(logand (ash port -8) #xff)
(logand port #xff)))))
(defun get-passive-ip-addr (client)
(let ((net (best-network-match (socket:remote-host (client-sock client))
(mapcar #'car *pasvipaddrs*))))
(if (null net)
(socket:local-host (client-sock client))
(cdr (assoc net *pasvipaddrs* :test #'eq)))))
(defun cmd-type (client cmdtail)
(block nil
(let ((params (delimited-string-to-list cmdtail " ")))
(cond
((or (equalp cmdtail "i") (equalp cmdtail "image"))
(setf (client-type client) :image)
(outline "200 Type set to I."))
((equalp cmdtail "e")
(outline "504 Type E not implemented."))
((or (equalp (first params) "a") (equalp (first params) "ascii"))
(if (and (second params)
(not (equalp (second params) "n")))
(return (outline "504 Form must be N.")))
(setf (client-type client) :ascii-nonprint)
(outline "200 Type set to A."))
((equalp (first params) "l")
(if (and (second params)
(not (string= (second params) "8")))
(return (outline "504 Byte size must be 8.")))
(setf (client-type client) :local)
(outline "200 Type set to L (byte size 8)."))
(t
(outline "500 'TYPE ~A': command not understood." cmdtail))))))
(defun cmd-stru (client cmdtail)
(declare (ignore client))
(if (not (member cmdtail '("f" "r" "p") :test #'equalp))
(outline "500 'STRU ~A': command not understood." cmdtail)
(if (not (equalp cmdtail "f"))
(outline "504 Unimplemented STRU type.")
(outline "200 STRU F ok."))))
(defun cmd-mode (client cmdtail)
(declare (ignore client))
(if (not (member cmdtail '("s" "b" "c") :test #'equalp))
(outline "500 'MODE ~A': command not understood." cmdtail)
(if (not (equalp cmdtail "s"))
(outline "504 Unimplemented MODE type.")
(outline "200 MODE S ok."))))
(defun cmd-rest (client cmdtail)
(block nil
(let ((point (ignore-errors (parse-integer cmdtail))))
(if (null point)
(return (outline "500 'REST ~A: command not understood." cmdtail)))
(if (< point 0)
(return (outline "501 'REST ~A: invalid parameter." cmdtail)))
(setf (client-restart client) point)
(outline "350 Restarting at ~D. Send STOR or RETR to initiate transfer."
point))))
(defun cmd-allo (client cmdtail)
(declare (ignore client cmdtail))
(outline "202 ALLO command ignored."))
;; XXX -- pretty useless since asynchronous requests aren't supported.
(defun cmd-abor (client cmdtail)
(declare (ignore cmdtail))
(cleanup-data-connection client)
(outline "225 ABOR command successful."))
(defun data-connection-prepared-p (client)
(or (dataport-addr client)
(pasv client)))
(defun cleanup-data-connection (client)
(when (dataport-open client)
(ignore-errors (close (dataport-sock client)))
(setf (dataport-sock client) nil)
(setf (dataport-open client) nil))
(when (pasv client)
(ignore-errors (close (pasv client)))
(setf (pasv client) nil))
(setf (dataport-addr client) nil)
(setf (dataport-port client) nil))
;; Drops connections made by other hosts.
(defun accept-pasv-connection-from-client (client)
(loop
(let ((newsock (ignore-errors (socket:accept-connection (pasv client)))))
(if newsock
(if (not (= (socket:remote-host newsock)
(socket:remote-host (client-sock client))))
(progn
(ftp-log
"Non-client connection to PASV port ~A:~A made by ~A.~%"
(socket:ipaddr-to-dotted
(socket:local-host (client-sock client)))
(socket:local-port (pasv client))
(socket:ipaddr-to-dotted
(socket:remote-host newsock)))
(ignore-errors (close newsock)))
(return newsock))))))
;; This is covered by the with-timeout in establish-data-connection
(defun make-active-connection (client)
(handler-case
(with-root-privs ()
(socket:make-socket :remote-host (dataport-addr client)
:remote-port (dataport-port client)
:local-host (socket:local-host (client-sock client))
:local-port *ftpdataport*
:reuse-address t
:type :hiper))
(error (c)
(ftp-log-client client "make-active-connection: make-socket failed; ~A~%" c)
nil)))
(defun establish-data-connection (client)
(block nil
(setf (dataport-sock client)
(mp:with-timeout (*connecttimeout* :timeout)
(if (pasv client)
(accept-pasv-connection-from-client client)
(make-active-connection client))))
(if (null (dataport-sock client))
(progn
(outline "425 Can't open data connection.")
(return nil)))
(if (eq (dataport-sock client) :timeout)
(progn
(outline "425 Can't open data connection. Timed out.")
(return nil)))
(socket:socket-control
(dataport-sock client)
:read-timeout *transfertimeout*
:write-timeout *transfertimeout*)
(setf (dataport-open client) t)))
(defun cmd-retr (client file)
(block nil
(let ((fullpath (make-full-path (pwd client) file)))
(if (and (restricted client)
(out-of-bounds-p client fullpath))
(return (outline "550 ~A: Permission denied." file)))
(if (null (data-connection-prepared-p client))
(return (outline "452 No data connection has been prepared.")))
(if (not (probe-file fullpath))
(multiple-value-bind (conv realname)
(conversion-match file)
(if conv
(return (start-conversion client conv realname)))
(return (outline "550 ~A: No such file or directory." file))))
(if (not (eq :file (excl::filesys-type fullpath)))
(return (outline "550 ~A: not a plain file." file)))
(ftp-with-open-file
(f errno fullpath)
(if (null f)
(return (outline "550 ~A: ~A" file (strerror errno))))
;; XXX -- this is only correct for binary files.
(let ((res (ignore-errors
(file-position f (client-restart client)))))
(setf (client-restart client) 0)
(if (null res)
(return (outline "550 ~A: RETR (with REST) failed." file))))
(transmit-stream client f fullpath)))))
;; This should be called after 'path' has been verified not to exist.
(defun conversion-match (path)
(let ((pathlen (length path))
ext
extlen)
(dolist (extcons *conversions*)
(setf ext (car extcons))
(setf extlen (length ext))
(if (and (> pathlen extlen)
(string= (subseq path (- pathlen extlen)) ext))
(return (values (cdr extcons)
(subseq path 0 (- pathlen extlen))))))))
(defun start-conversion (client conversionvec file)
(block nil
(if (not (eq (client-type client) :image))
(return
(outline "~
550 This is a BINARY file, using ASCII mode to transfer will corrupt it.")))
(if (not (= 0 (client-restart client)))
(return
(outline "550 REST not allowed with conversions.")))
(let ((cmdvec (concatenate 'vector
(vector (aref conversionvec 0)) ;; duplicate first entry
conversionvec
(vector file))))
(with-external-command (stream cmdvec)
(transmit-stream client stream (aref cmdvec 0))))))
(defun transmit-stream (client stream name)
(block nil
(if (null (establish-data-connection client))
(return))
(outline "150 Opening ~A mode data connection for ~A."
(if (eq (client-type client) :image)
"BINARY" "ASCII")
name)
(if (handler-case (dump-file client stream)
(socket-error (c)
(if (or (eq (stream-error-identifier c) :read-timeout)
(eq (stream-error-identifier c) :write-timeout))
(outline "426 Data transfer timeout.")
(outline "426 Data connection: Broken pipe."))
nil)
(error (c)
(let ((*print-pretty* nil))
(outline "426 Error: ~A"
(substitute #\space #\newline (format nil "~A" c))))
nil))
(outline "226 Transfer complete."))
(xfer-log client name :retr
(excl::socket-bytes-written (dataport-sock client)))
(cleanup-data-connection client)))
(defun dump-file (client f)
(if (eq (client-type client) :ascii-nonprint)
(dump-file-ascii client f)
(dump-file-binary client f))
t)
(defun dump-file-ascii (client f)
(let ((inbuffer (make-string 32768))
(outbuffer (make-array 65536 :element-type '(unsigned-byte 8)))
(sock (dataport-sock client))
got)
(while (not (= 0 (setf got (read-sequence inbuffer f :partial-fill t))))
(multiple-value-bind (ignore count)
(string-to-octets inbuffer
:null-terminate nil
:mb-vector outbuffer
:end got
:external-format *extfcrlf*)
(declare (ignore ignore))
(write-complete-vector outbuffer count sock))))
t)
(defun dump-file-binary (client f)
(let ((buffer (make-array 65536 :element-type '(unsigned-byte 8)))
(sock (dataport-sock client))
got)
(while (/= 0 (setf got (read-vector buffer f)))
(write-complete-vector buffer got sock)))
t)
(defun write-complete-vector (vec end stream)
(let ((pos 0)
newpos)
(while (< pos end)