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Article contents:== Outdated egg! This is an egg for CHICKEN 4, the unsupported old release. You're almost certainly looking for [[/eggref/5/tun|the CHICKEN 5 version of this egg]], if it exists. If it does not exist, there may be equivalent functionality provided by another egg; have a look at the [[https://wiki.call-cc.org/chicken-projects/egg-index-5.html|egg index]]. Otherwise, please consider porting this egg to the current version of CHICKEN. [[tags: egg]] == tun [[toc:]] === Description A library to create Linux TUN/TAP interfaces === Current status The library currently allows the opening of a TUN/TAP interface in either TUN or TAP mode and keeps track of the interface name and its file descriptor. It provides two utility functions tun-up! and tun-mac which bring the interface up and return the interface MAC address respectively. Note: the library assumes the presence of the "/dev/net/tun" device file. See https://www.kernel.org/doc/Documentation/networking/tuntap.txt. === Author Omar Shorbaji === Requirements defstruct lolevel socket === API <procedure> (make-tun #!optional (mode 'tun) (pi #f)) </procedure> returns a tun/tap interface. The mode argument can be 'tun for a tunnel interface or 'tap for a tap interface. When the argument pi is #t we do not send the IFF_NO_PI flag and the interface includes packet information (four bytes) when reading every packet or frame <procedure>(tun-fd tun)</procedure> returns the file descriptor associated with the tunnel interface. Writing to this file descriptor sends data out of the interface. Note that written data must be well-formed packet (for tun) or ethernet frame (for tap). <procedure> (tun-name) </procedure> returns the name of the TUN/TAP interface. Available after running make-tun <procedure> (tun-mac tun) </procedure> returns the MAC address associated with a TUN or TAP interface as a list of 6 integers === Examples <enscript highlight="scheme"> (define tap (make-tun 'tap)) ; creates a TUN/TAP interface in tap mode (tun-up! tun) ; brings interface up (print "MAC address: " (tun-mac tap)) (use posix ethernet) (let* ((pr (file-read fd size)) (buf (car pr)) (n (cadr pr))) (with-input-from-string (string-take buf n) (read-ethernet-frame))) ; reads an ethernet frame from TAP interface </enscript> === Repository [[https://github.com/shorbaji/chicken-tun]] === License ;; Copyright (c) 2016, Omar Shorbaji ;; All rights reserved. ;; ;; Redistribution and use in source and binary forms, with or without ;; modification, are permitted provided that the following conditions are met: ;; ;; Redistributions of source code must retain the above copyright notice, this ;; list of conditions and the following disclaimer. ;; Redistributions in binary form must reproduce the above copyright notice, ;; this list of conditions and the following disclaimer in the documentation ;; and/or other materials provided with the distribution. ;; Neither the name of the author nor the names of its contributors may be ;; used to endorse or promote products derived from this software without ;; specific prior written permission. ;; ;; THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" ;; AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE ;; IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ;; ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE ;; LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR ;; CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OFcl ;; SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS ;; INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN ;; CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ;; ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE ;; POSSIBILITY OF SUCH DAMAGE. === Version History 0.1 alpha releaseDescription of your changes:

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