1 (in-package :sb-bsd-sockets)
3 #|| <h2>INET-domain sockets</h2>
5 <p>The TCP and UDP sockets that you know and love. Some representation issues:
7 <li>These functions do not accept hostnames directly: see <a href="#name-service">name resolution</a>
8 <li>Internet <b>addresses</b> are represented by vectors of <tt>(unsigned-byte 8)</tt> - viz. <tt>#(127 0 0 1)</tt>. <b>Ports</b> are just integers: <tt>6010</tt>. No conversion between network- and host-order data is needed from the user of this package.
9 <li><b><i>socket addresses</i></b> are represented by the two values for <b>address</b> and <b>port</b>, so for example, <tt>(<a href="#SOCKET-CONNECT">socket-connect</a> s #(192.168.1.1) 80)</tt>
14 ;;; Our class and constructor
16 (eval-when (:compile-toplevel :load-toplevel :execute)
17 (defclass inet-socket (socket)
18 ((family :initform sockint::AF-INET))))
20 ;;; XXX should we *...* this?
21 (defparameter inet-address-any (vector 0 0 0 0))
23 ;;; binding a socket to an address and port. Doubt that anyone's
24 ;;; actually using this much, to be honest.
26 (defun make-inet-address (dotted-quads)
27 "Return a vector of octets given a string DOTTED-QUADS in the format
30 (mapcar #'parse-integer
31 (split dotted-quads nil '(#\.)))
34 ;;; getprotobyname only works in the internet domain, which is why this
36 (defun get-protocol-by-name (name) ;exported
37 "Returns the network protocol number associated with the string NAME,
38 using getprotobyname(2) which typically looks in NIS or /etc/protocols"
39 ;; for extra brownie points, could return canonical protocol name
40 ;; and aliases as extra values
41 (let ((ent (sockint::foreign-vector (sockint::getprotobyname name) 1
42 sockint::size-of-protoent)))
43 (sockint::protoent-proto ent)))
47 ;;; (1) sockaddrs are represented as the semi-foreign array-of-octets
49 ;;; (2) a protocol provides make-sockaddr-for, size-of-sockaddr,
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))))
55 ;; port and host are represented in C as "network-endian" unsigned
56 ;; integers of various lengths. This is stupid. The value of the
57 ;; integer doesn't matter (and will change depending on your
58 ;; machine's endianness); what the bind(2) call is interested in
59 ;; is the pattern of bytes within that integer.
61 ;; We have no truck with such dreadful type punning. Octets to
62 ;; octets, dust to dust.
64 (setf (sockint::sockaddr-in-family sockaddr) sockint::af-inet)
65 (setf (sockint::sockaddr-in-port sockaddr 0) (ldb (byte 8 8) port))
66 (setf (sockint::sockaddr-in-port sockaddr 1) (ldb (byte 8 0) port))
68 (setf (sockint::sockaddr-in-addr sockaddr 0) (elt host 0))
69 (setf (sockint::sockaddr-in-addr sockaddr 1) (elt host 1))
70 (setf (sockint::sockaddr-in-addr sockaddr 2) (elt host 2))
71 (setf (sockint::sockaddr-in-addr sockaddr 3) (elt host 3)))
74 (defmethod size-of-sockaddr ((socket inet-socket))
75 sockint::size-of-sockaddr-in)
77 (defmethod bits-of-sockaddr ((socket inet-socket) sockaddr)
78 "Returns address and port of SOCKADDR as multiple values"
81 (sockint::sockaddr-in-addr sockaddr 0)
82 (sockint::sockaddr-in-addr sockaddr 1)
83 (sockint::sockaddr-in-addr sockaddr 2)
84 (sockint::sockaddr-in-addr sockaddr 3))
85 (+ (* 256 (sockint::sockaddr-in-port sockaddr 0))
86 (sockint::sockaddr-in-port sockaddr 1))))
89 (defun make-inet-socket (type protocol)
90 "Make an INET socket. Deprecated in favour of make-instance"
91 (make-instance 'inet-socket :type type :protocol protocol))