contrib/sb-bsd-sockets/inet.lisp

   1 (in-package :sb-bsd-sockets)
   2
   3 ;;; Our class and constructor
   4
   5 (eval-when (:compile-toplevel :load-toplevel :execute)
   6   (defclass inet-socket (socket)
   7     ((family :initform sockint::AF-INET))
   8     (:documentation "Class representing TCP and UDP sockets.
   9
  10 Examples:
  11
  12  (make-instance 'inet-socket :type :stream :protocol :tcp)
  13
  14  (make-instance 'inet-socket :type :datagram :protocol :udp)
  15 ")))
  16
  17 ;;; XXX should we *...* this?
  18 (defparameter inet-address-any (vector 0 0 0 0))
  19
  20 ;;; binding a socket to an address and port.  Doubt that anyone's
  21 ;;; actually using this much, to be honest.
  22
  23 (defun make-inet-address (dotted-quads)
  24   "Return a vector of octets given a string DOTTED-QUADS in the format
  25 \"127.0.0.1\""
  26   (map 'vector
  27        #'parse-integer
  28        (split dotted-quads nil '(#\.))))
  29
  30 (define-condition unknown-protocol ()
  31   ((name :initarg :name
  32          :reader unknown-protocol-name))
  33   (:report (lambda (c s)
  34              (format s "Protocol not found: ~a" (prin1-to-string
  35                                                  (unknown-protocol-name c))))))
  36
  37 ;;; getprotobyname only works in the internet domain, which is why this
  38 ;;; is here
  39 (defun get-protocol-by-name (name)      ;exported
  40   "Returns the network protocol number associated with the string NAME,
  41 using getprotobyname(2) which typically looks in NIS or /etc/protocols"
  42   ;; for extra brownie points, could return canonical protocol name
  43   ;; and aliases as extra values
  44   (let ((ent (sockint::getprotobyname name)))
  45     (if (sb-alien::null-alien ent)
  46         (error 'unknown-protocol :name name))
  47     (sockint::protoent-proto ent)))
  48
  49 ;;; our protocol provides make-sockaddr-for, size-of-sockaddr,
  50 ;;; bits-of-sockaddr
  51
  52 (defmethod make-sockaddr-for ((socket inet-socket) &optional sockaddr &rest address &aux (host (first address)) (port (second address)))
  53   (let ((sockaddr (or sockaddr (sockint::allocate-sockaddr-in))))
  54     (when (and host port)
  55       (setf host (coerce host '(simple-array (unsigned-byte 8) (4))))
  56       ;; port and host are represented in C as "network-endian" unsigned
  57       ;; integers of various lengths.  This is stupid.  The value of the
  58       ;; integer doesn't matter (and will change depending on your
  59       ;; machine's endianness); what the bind(2) call is interested in
  60       ;; is the pattern of bytes within that integer.
  61
  62       ;; We have no truck with such dreadful type punning.  Octets to
  63       ;; octets, dust to dust.
  64
  65       (setf (sockint::sockaddr-in-family sockaddr) sockint::af-inet)
  66       (setf (sb-alien:deref (sockint::sockaddr-in-port sockaddr) 0) (ldb (byte 8 8) port))
  67       (setf (sb-alien:deref (sockint::sockaddr-in-port sockaddr) 1) (ldb (byte 8 0) port))
  68
  69       (setf (sb-alien:deref (sockint::sockaddr-in-addr sockaddr) 0) (elt host 0))
  70       (setf (sb-alien:deref (sockint::sockaddr-in-addr sockaddr) 1) (elt host 1))
  71       (setf (sb-alien:deref (sockint::sockaddr-in-addr sockaddr) 2) (elt host 2))
  72       (setf (sb-alien:deref (sockint::sockaddr-in-addr sockaddr) 3) (elt host 3)))
  73     sockaddr))
  74
  75 (defmethod free-sockaddr-for ((socket inet-socket) sockaddr)
  76   (sockint::free-sockaddr-in sockaddr))
  77
  78 (defmethod size-of-sockaddr ((socket inet-socket))
  79   sockint::size-of-sockaddr-in)
  80
  81 (defmethod bits-of-sockaddr ((socket inet-socket) sockaddr)
  82   "Returns address and port of SOCKADDR as multiple values"
  83   (values
  84    (coerce (loop for i from 0 below 4
  85                  collect (sb-alien:deref (sockint::sockaddr-in-addr sockaddr) i))
  86            '(vector (unsigned-byte 8) 4))
  87    (+ (* 256 (sb-alien:deref (sockint::sockaddr-in-port sockaddr) 0))
  88       (sb-alien:deref (sockint::sockaddr-in-port sockaddr) 1))))
  89
  90 (defun make-inet-socket (type protocol)
  91   "Make an INET socket.  Deprecated in favour of make-instance"
  92   (make-instance 'inet-socket :type type :protocol protocol))