contrib/sb-bsd-sockets/local.lisp

   1 (in-package :sb-bsd-sockets)
   2
   3 (defclass local-socket (socket)
   4   ((family :initform sockint::af-local))
   5   (:documentation "Class representing local domain (AF_LOCAL) sockets,
   6 also known as unix-domain sockets."))
   7
   8 (defmethod socket-namestring ((socket local-socket))
   9   (ignore-errors (socket-name socket)))
  10
  11 (defmethod socket-peerstring ((socket local-socket))
  12   (ignore-errors (socket-peername socket)))
  13
  14 (defmethod make-sockaddr-for ((socket local-socket)
  15                               &optional sockaddr &rest address &aux (filename (first address)))
  16   (let ((sockaddr (or sockaddr (sockint::allocate-sockaddr-un))))
  17     (setf (sockint::sockaddr-un-family sockaddr) sockint::af-local)
  18     (when filename
  19       (setf (sockint::sockaddr-un-path sockaddr) filename))
  20     sockaddr))
  21
  22 (defmethod free-sockaddr-for ((socket local-socket) sockaddr)
  23   (sockint::free-sockaddr-un sockaddr))
  24
  25 (defmethod size-of-sockaddr ((socket local-socket))
  26   sockint::size-of-sockaddr-un)
  27
  28 (defmethod bits-of-sockaddr ((socket local-socket) sockaddr)
  29   "Return the file name of the local socket address SOCKADDR."
  30   (let ((name (sockint::sockaddr-un-path sockaddr)))
  31     (if (zerop (length name)) nil name)))
  32
  33 (defclass local-abstract-socket (local-socket) ()
  34   (:documentation "Class representing local domain (AF_LOCAL) sockets with
  35 addresses in the abstract namespace."))
  36
  37 (defmethod make-sockaddr-for ((socket local-abstract-socket)
  38                               &optional sockaddr &rest address
  39                               &aux (path (first address)))
  40   (let ((sockaddr (or sockaddr (sockint::allocate-sockaddr-un-abstract)))
  41         (len 0))
  42     (setf (sockint::sockaddr-un-abstract-family sockaddr) sockint::af-local)
  43     ;;First byte of the path is always 0.
  44     (setf (sb-alien:deref (sockint::sockaddr-un-abstract-path sockaddr) 0) 0)
  45
  46     (when path
  47       (when (stringp path)
  48         (setf path (sb-ext:string-to-octets path)))
  49       (setf len (min (- sockint::size-of-sockaddr-un-abstract 3) (length path)))
  50       ;;We fill in the rest of the path starting at index 1.
  51       (loop for i from 0 below len
  52             do (setf (sb-alien:deref (sockint::sockaddr-un-abstract-path
  53                                       sockaddr)
  54                                      (1+ i))
  55                      (elt path i))))
  56     (values sockaddr (+ 3 len))))
  57
  58 (defmethod free-sockaddr-for ((socket local-abstract-socket) sockaddr)
  59   (sockint::free-sockaddr-un-abstract sockaddr))
  60
  61 (defmethod size-of-sockaddr ((socket local-abstract-socket))
  62   sockint::size-of-sockaddr-un-abstract)
  63
  64 (defmethod bits-of-sockaddr ((socket local-abstract-socket) sockaddr)
  65   "Return the contents of the local socket address SOCKADDR."
  66   (let* ((path-len (- sockint::size-of-sockaddr-un-abstract 3))
  67          (path (make-array `(,path-len)
  68                            :element-type '(unsigned-byte 8)
  69                            :initial-element 0)))
  70     ;;exclude the first byte (it's always null) of the address
  71     (loop for i from 1 to path-len
  72           do (setf (elt path (1- i))
  73                    (sb-alien:deref (sockint::sockaddr-un-abstract-path sockaddr)
  74                                    i)))
  75     path))
  76
  77 (defmethod socket-connect ((socket local-abstract-socket) &rest peer
  78                            &aux (path (first peer)))
  79   (multiple-value-bind (sockaddr addr-len)
  80       (make-sockaddr-for socket nil path)
  81     (unwind-protect
  82          (if (= (sockint::connect (socket-file-descriptor socket)
  83                                   sockaddr
  84                                   addr-len)
  85                 -1)
  86              (socket-error "connect"))
  87       (free-sockaddr-for socket sockaddr))))
  88
  89 (defmethod socket-bind ((socket local-abstract-socket)
  90                         &rest address &aux (path (first address)))
  91   (multiple-value-bind (sockaddr addr-len)
  92       (make-sockaddr-for socket nil path)
  93     (unwind-protect
  94          (if (= (sockint::bind (socket-file-descriptor socket)
  95                                sockaddr
  96                                addr-len)
  97                 -1)
  98              (socket-error "bind"))
  99       (free-sockaddr-for socket sockaddr))))