gnu: Add vpnc.

* gnu/packages/vpn.scm: New file.
* Makefile.am (MODULES): Add it.
* gnu/packages/patches/vpnc-script.patch: New file.
* Makefile.am (dist_patch_DATA): Add it.

Makefile.am

@@ -158,6 +158,7 @@ MODULES =					\
   gnu/packages/tmux.scm 			\
   gnu/packages/tor.scm				\
   gnu/packages/vim.scm 				\
+  gnu/packages/vpn.scm				\
   gnu/packages/wdiff.scm			\
   gnu/packages/wget.scm				\
   gnu/packages/which.scm			\
@@ -215,7 +216,8 @@ dist_patch_DATA =						\
   gnu/packages/patches/shishi-gets-undeclared.patch		\
   gnu/packages/patches/tar-gets-undeclared.patch		\
   gnu/packages/patches/tcsh-fix-autotest.patch 			\
-  gnu/packages/patches/teckit-cstdio.patch
+  gnu/packages/patches/teckit-cstdio.patch			\
+  gnu/packages/patches/vpnc-script.patch
 
 bootstrapdir = $(guilemoduledir)/gnu/packages/bootstrap
 bootstrap_x86_64_linuxdir = $(bootstrapdir)/x86_64-linux

gnu/packages/patches/vpnc-script.patch

@@ -0,0 +1,15 @@
+This patch adapts the vpnc script to newer kernel versions, see
+   https://lkml.org/lkml/2011/3/24/645
+
+diff -u a/vpnc-script.in b/vpnc-script.in
+--- a/vpnc-script.in	2013-03-03 13:55:16.000000000 +0100
++++ b/vpnc-script.in	2013-03-03 13:56:11.000000000 +0100
+@@ -116,7 +116,7 @@
+ 
+ if [ -n "$IPROUTE" ]; then
+ 	fix_ip_get_output () {
+-		sed 's/cache//;s/metric \?[0-9]\+ [0-9]\+//g;s/hoplimit [0-9]\+//g'
++		sed 's/cache//;s/metric \?[0-9]\+ [0-9]\+//g;s/hoplimit [0-9]\+//g;s/ipid 0x....//g'
+ 	}
+ 
+ 	set_vpngateway_route() {

gnu/packages/vpn.scm

@@ -0,0 +1,66 @@
+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2013 Andreas Enge <andreas@enge.fr>
+;;;
+;;; This file is part of GNU Guix.
+;;;
+;;; GNU Guix is free software; you can redistribute it and/or modify it
+;;; under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation; either version 3 of the License, or (at
+;;; your option) any later version.
+;;;
+;;; GNU Guix is distributed in the hope that it will be useful, but
+;;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;;; GNU General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (gnu packages vpn)
+  #:use-module ((guix licenses)
+                #:renamer (symbol-prefix-proc 'license:))
+  #:use-module (guix packages)
+  #:use-module (guix download)
+  #:use-module (guix build-system gnu)
+  #:use-module (gnu packages)
+  #:use-module (gnu packages gnupg)
+  #:use-module (gnu packages perl))
+
+(define-public vpnc
+  (package
+   (name "vpnc")
+   (version "0.5.3")
+   (source (origin
+            (method url-fetch)
+            (uri (string-append "http://www.unix-ag.uni-kl.de/~massar/vpnc/vpnc-"
+                                version ".tar.gz"))
+            (sha256 (base32
+                     "1128860lis89g1s21hqxvap2nq426c9j4bvgghncc1zj0ays7kj6"))))
+   (build-system gnu-build-system)
+   (inputs `(("libgcrypt" ,libgcrypt)
+             ("perl" ,perl)
+             ("patch/script"
+                 ,(search-patch "vpnc-script.patch"))))
+   (arguments
+    `(#:tests? #f ; there is no check target
+      #:patches (list (assoc-ref %build-inputs
+                                 "patch/script"))
+      #:phases
+      (alist-replace
+       'configure
+       (lambda* (#:key outputs #:allow-other-keys)
+         (let ((out (assoc-ref outputs "out")))
+           (substitute* "Makefile"
+             (("PREFIX=/usr/local") (string-append "PREFIX=" out)))
+           (substitute* "Makefile"
+             (("ETCDIR=/etc/vpnc") (string-append "ETCDIR=" out "/etc/vpnc")))))
+       %standard-phases)))
+   (synopsis "vpnc, a client for cisco vpn concentrators")
+   (description
+    "vpnc is a VPN client compatible with Cisco's EasyVPN equipment.
+It supports IPSec (ESP) with Mode Configuration and Xauth. It supports only
+shared-secret IPSec authentication with Xauth, AES (256, 192, 128), 3DES,
+1DES, MD5, SHA1, DH1/2/5 and IP tunneling. It runs entirely in userspace.
+Only \"Universal TUN/TAP device driver support\" is needed in the kernel.")
+   (license license:gpl2+) ; some file are bsd-2, see COPYING
+   (home-page "http://www.unix-ag.uni-kl.de/~massar/vpnc/")))