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;;; Copyright (C) 2005 David Lichteblau
;;;
;;; See LICENSE for details.
(in-package cl+ssl)
(defconstant +bio-type-socket+ (logior 5 #x0400 #x0100))
(defconstant +BIO_FLAGS_READ+ 1)
(defconstant +BIO_FLAGS_WRITE+ 2)
(defconstant +BIO_FLAGS_SHOULD_RETRY+ 8)
(defconstant +BIO_CTRL_FLUSH+ 11)
(cffi:defcstruct bio-method
(type :int)
(name :pointer)
(bwrite :pointer)
(bread :pointer)
(bputs :pointer)
(bgets :pointer)
(ctrl :pointer)
(create :pointer)
(destroy :pointer)
(callback-ctrl :pointer))
(cffi:defcstruct bio
(method :pointer)
(callback :pointer)
(cb-arg :pointer)
(init :int)
(shutdown :int)
(flags :int)
(retry-reason :int)
(num :int)
(ptr :pointer)
(next-bio :pointer)
(prev-bio :pointer)
(references :int)
(num-read :unsigned-long)
(num-write :unsigned-long)
(crypto-ex-data-stack :pointer)
(crypto-ex-data-dummy :int))
(defun make-bio-lisp-method ()
(let ((m (cffi:foreign-alloc 'bio-method)))
(setf (cffi:foreign-slot-value m 'bio-method 'type)
;; fixme: this is wrong, but presumably still better than some
;; random value here.
+bio-type-socket+)
(macrolet ((slot (name)
`(cffi:foreign-slot-value m 'bio-method ,name)))
(setf (slot 'name) (cffi:foreign-string-alloc "lisp"))
(setf (slot 'bwrite) (cffi:callback lisp-write))
(setf (slot 'bread) (cffi:callback lisp-read))
(setf (slot 'bputs) (cffi:callback lisp-puts))
(setf (slot 'bgets) (cffi:null-pointer))
(setf (slot 'ctrl) (cffi:callback lisp-ctrl))
(setf (slot 'create) (cffi:callback lisp-create))
(setf (slot 'destroy) (cffi:callback lisp-destroy))
(setf (slot 'callback-ctrl) (cffi:null-pointer)))
m))
(defun bio-new-lisp ()
(bio-new *bio-lisp-method*))
;;; "cargo cult"
(cffi:defcallback lisp-write :int ((bio :pointer) (buf :pointer) (n :int))
bio
(dotimes (i n)
(write-byte (cffi:mem-ref buf :unsigned-char i) *socket*))
(finish-output *socket*)
n)
(defun clear-retry-flags (bio)
(setf (cffi:foreign-slot-value bio 'bio 'flags)
(logandc2 (cffi:foreign-slot-value bio 'bio 'flags)
(logior +BIO_FLAGS_READ+
+BIO_FLAGS_WRITE+
+BIO_FLAGS_SHOULD_RETRY+))))
(defun set-retry-read (bio)
(setf (cffi:foreign-slot-value bio 'bio 'flags)
(logior (cffi:foreign-slot-value bio 'bio 'flags)
+BIO_FLAGS_READ+
+BIO_FLAGS_SHOULD_RETRY+)))
(cffi:defcallback lisp-read :int ((bio :pointer) (buf :pointer) (n :int))
bio buf n
(let ((i 0))
(handler-case
(unless (or (cffi:null-pointer-p buf) (null n))
(clear-retry-flags bio)
(when (or *blockp* (listen *socket*))
(setf (cffi:mem-ref buf :unsigned-char i) (read-byte *socket*))
(incf i))
(loop
while (and (< i n)
(or (null *partial-read-p*) (listen *socket*)))
do
(setf (cffi:mem-ref buf :unsigned-char i) (read-byte *socket*))
(incf i))
#+(or)
(when (zerop i) (set-retry-read bio)))
(end-of-file ()))
i))
(cffi:defcallback lisp-puts :int ((bio :pointer) (buf :string))
bio buf
(error "lisp-puts not implemented"))
(cffi:defcallback lisp-ctrl :int
((bio :pointer) (cmd :int) (larg :long) (parg :pointer))
bio larg parg
(cond
((eql cmd +BIO_CTRL_FLUSH+) 1)
(t
;; (warn "lisp-ctrl(~A,~A,~A)" cmd larg parg)
0)))
(cffi:defcallback lisp-create :int ((bio :pointer))
(setf (cffi:foreign-slot-value bio 'bio 'init) 1)
(setf (cffi:foreign-slot-value bio 'bio 'num) 0)
(setf (cffi:foreign-slot-value bio 'bio 'ptr) (cffi:null-pointer))
(setf (cffi:foreign-slot-value bio 'bio 'flags) 0)
1)
(cffi:defcallback lisp-destroy :int ((bio :pointer))
(cond
((cffi:null-pointer-p bio) 0)
(t
(setf (cffi:foreign-slot-value bio 'bio 'init) 0)
(setf (cffi:foreign-slot-value bio 'bio 'flags) 0)
1)))
(setf *bio-lisp-method* nil) ;force reinit if anything changed here
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