;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2014 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2015 Ricardo Wurmus <rekado@elephly.net>
;;; Copyright © 2015 Mark H Weaver <mhw@netris.org>
;;; Copyright © 2015 Stefan Reichör <stefan@xsteve.at>
;;; Copyright © 2016 Raimon Grau <raimonster@gmail.com>
;;; Copyright © 2016 Tobias Geerinckx-Rice <me@tobias.gr>
;;; Copyright © 2016 John Darrington <jmd@gnu.org>
;;; Copyright © 2016 Nicolas Goaziou <mail@nicolasgoaziou.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 networking)
  #:use-module (guix build-system perl)
  #:use-module ((guix licenses) #:prefix license:)
  #:use-module (guix packages)
  #:use-module (guix download)
  #:use-module (guix build-system glib-or-gtk)
  #:use-module (guix build-system gnu)
  #:use-module (gnu packages admin)
  #:use-module (gnu packages adns)
  #:use-module (gnu packages algebra)
  #:use-module (gnu packages audio)
  #:use-module (gnu packages bison)
  #:use-module (gnu packages check)
  #:use-module (gnu packages compression)
  #:use-module (gnu packages flex)
  #:use-module (gnu packages gettext)
  #:use-module (gnu packages gnupg)
  #:use-module (gnu packages gtk)
  #:use-module (gnu packages linux)
  #:use-module (gnu packages lua)
  #:use-module (gnu packages mit-krb5)
  #:use-module (gnu packages ncurses)
  #:use-module (gnu packages perl)
  #:use-module (gnu packages pkg-config)
  #:use-module (gnu packages python)
  #:use-module (gnu packages tls))

(define-public macchanger
  (package
    (name "macchanger")
    (version "1.6.0")
    (source (origin
              (method url-fetch)
              (uri (string-append "mirror://gnu/"
                                  name "/" name "-" version ".tar.gz"))
              (sha256
               (base32
                "1xsiivjjyhqcs6dyjcshrnxlgypvyfzacjz7gcjgl88xiw9lylri"))))
    (build-system gnu-build-system)
    (home-page "http://www.gnu.org/software/macchanger")
    (synopsis "Display or change the MAC address of networking devices")
    (description "GNU MAC Changer is a utility for viewing and changing MAC
addresses of networking devices.  New addresses may be set explicitly or
randomly.  They can include MAC addresses of the same or other hardware vendors
or, more generally, MAC addresses of the same category of hardware.") 
    (license license:gpl2+)))

(define-public miredo
  (package
    (name "miredo")
    (version "1.2.6")
    (source (origin
              (method url-fetch)
              (uri (string-append "http://www.remlab.net/files/miredo/miredo-"
                                  version ".tar.xz"))
              (sha256
               (base32
                "0j9ilig570snbmj48230hf7ms8kvcwi2wblycqrmhh85lksd49ps"))))
    (build-system gnu-build-system)
    (arguments
     '(#:phases
       (modify-phases %standard-phases
         ;; The checkconf test in src/ requires network access.
         (add-before
          'check 'disable-checkconf-test
          (lambda _
            (substitute* "src/Makefile"
              (("^TESTS = .*") "TESTS = \n")))))))
    (home-page "http://www.remlab.net/miredo/")
    (synopsis "Teredo IPv6 tunneling software")
    (description
     "Miredo is an implementation (client, relay, server) of the Teredo
specification, which provides IPv6 Internet connectivity to IPv6 enabled hosts
residing in IPv4-only networks, even when they are behind a NAT device.")
    (license license:gpl2+)))

(define-public socat
  (package
    (name "socat")
    (version "1.7.3.1")
    (source (origin
              (method url-fetch)
              (uri (string-append
                    "http://www.dest-unreach.org/socat/download/socat-"
                    version ".tar.bz2"))
              (sha256
               (base32
                "1apvi7sahcl44arnq1ad2y6lbfqnmvx7nhz9i3rkk0f382anbnnj"))))
    (build-system gnu-build-system)
    (arguments '(#:tests? #f))                    ;no 'check' phase
    (inputs `(("openssl" ,openssl)))
    (home-page "http://www.dest-unreach.org/socat/")
    (synopsis
     "Open bidirectional communication channels from the command line")
    (description
     "socat is a relay for bidirectional data transfer between two independent
data channels---files, pipes, devices, sockets, etc.  It can create
\"listening\" sockets, named pipes, and pseudo terminals.

socat can be used, for instance, as TCP port forwarder, as a shell interface
to UNIX sockets, IPv6 relay, for redirecting TCP oriented programs to a serial
line, to logically connect serial lines on different computers, or to
establish a relatively secure environment (su and chroot) for running client
or server shell scripts with network connections.")
    (license license:gpl2)))

(define-public zeromq
  (package
    (name "zeromq")
    (version "4.0.7")
    (source (origin
              (method url-fetch)
              (uri (string-append "http://download.zeromq.org/zeromq-"
                                  version ".tar.gz"))
              (sha256
               (base32
                "00vvwhgcdr1lva2pavicvy92iad0hj8cf71n702hv6blw1kjj2z0"))))
    (build-system gnu-build-system)
    (home-page "http://zeromq.org")
    (synopsis "Library for message-based applications")
    (description
     "The 0MQ lightweight messaging kernel is a library which extends the
standard socket interfaces with features traditionally provided by specialized
messaging middle-ware products.  0MQ sockets provide an abstraction of
asynchronous message queues, multiple messaging patterns, message
filtering (subscriptions), seamless access to multiple transport protocols and
more.")
    (license license:lgpl3+)))

(define-public librdkafka
  (package
    (name "librdkafka")
    (version "0.9.1")
    (source (origin
              (method url-fetch)
              (uri (string-append
                    "https://github.com/edenhill/librdkafka/archive/"
                    version ".tar.gz"))
              (file-name (string-append name "-" version ".tar.gz"))
              (sha256
               (base32
                "10ldx7g7ymmg17snzx78vy4n8ma1rjx0agzi34g15j2fk867xmas"))))
    (build-system gnu-build-system)
    (arguments
     '(#:phases
       (modify-phases %standard-phases
         (replace 'configure
           ;; its custom configure script doesn't understand 'CONFIG_SHELL'.
           (lambda* (#:key outputs #:allow-other-keys)
             (let ((out (assoc-ref outputs "out")))
               ;; librdkafka++.so lacks RUNPATH for librdkafka.so
               (setenv "LDFLAGS"
                       (string-append "-Wl,-rpath=" out "/lib"))
               (zero? (system* "./configure"
                               (string-append "--prefix=" out)))))))))
    (native-inputs
     `(("python" ,python-wrapper)))
    (propagated-inputs
     `(("zlib" ,zlib))) ; in the Libs.private field of rdkafka.pc
    (home-page "https://github.com/edenhill/librdkafka")
    (synopsis "Apache Kafka C/C++ client library")
    (description
     "librdkafka is a C library implementation of the Apache Kafka protocol,
containing both Producer and Consumer support.")
    (license license:bsd-2)))

(define-public libndp
  (package
    (name "libndp")
    (version "1.6")
    (source (origin
              (method url-fetch)
              (uri (string-append "http://libndp.org/files/"
                                  name "-" version ".tar.gz"))
              (sha256
               (base32
                "03mczwrxqbp54msafxzzyhaazkvjdwm2kipjkrb5xg8kw22glz8c"))))
    (build-system gnu-build-system)
    (home-page "http://libndp.org/")
    (synopsis "Library for Neighbor Discovery Protocol")
    (description
     "libndp contains a library which provides a wrapper for IPv6 Neighbor
Discovery Protocol.  It also provides a tool named ndptool for sending and
receiving NDP messages.")
    (license license:lgpl2.1+)))

(define-public ethtool
  (package
    (name "ethtool")
    (version "4.0")
    (source (origin
              (method url-fetch)
              (uri (string-append "mirror://kernel.org/software/network/"
                                  name "/" name "-" version ".tar.xz"))
              (sha256
               (base32
                "1zzcwn6pk8qfasalqkxg8vrhacksfa50xsq4xifw7yfjqyn8fj4h"))))
    (build-system gnu-build-system)
    (home-page "https://www.kernel.org/pub/software/network/ethtool/")
    (synopsis "Display or change Ethernet device settings")
    (description
     "ethtool can be used to query and change settings such as speed,
auto-negotiation and checksum offload on many network devices, especially
Ethernet devices.")
    (license license:gpl2)))

(define-public ifstatus
  (package
    (name "ifstatus")
    (version "1.1.0")
    (source (origin
              (method url-fetch)
              (uri (string-append "mirror://sourceforge/ifstatus/ifstatus/"
                                  "ifstatus%20v" version "/ifstatus-v"
                                  version ".tar.gz"))
              (sha256
               (base32
                "045cbsq9ps32j24v8y5hpyqxnqn9mpaf3mgvirlhgpqyb9jsia0c"))
              (modules '((guix build utils)))
              (snippet
               '(substitute* "Main.h"
                  (("#include <stdio.h>")
                   "#include <stdio.h>\n#include <stdlib.h>")))))
    (build-system gnu-build-system)
    (arguments
     '(#:tests? #f                                ; no "check" target
       #:phases
       (modify-phases %standard-phases
         (delete 'configure)             ; no configure script
         (replace 'install
                  (lambda* (#:key outputs #:allow-other-keys)
                    (let* ((out (assoc-ref outputs "out"))
                           (bin (string-append out "/bin")))
                      (mkdir-p bin)
                      (copy-file "ifstatus"
                                 (string-append bin "/ifstatus"))))))))
    (inputs `(("ncurses" ,ncurses)))
    (home-page "http://ifstatus.sourceforge.net/graphic/index.html")
    (synopsis "Text based network interface status monitor")
    (description
     "IFStatus is a simple, easy-to-use program for displaying commonly
needed/wanted real-time traffic statistics of multiple network
interfaces, with a simple and efficient view on the command line.  It is
intended as a substitute for the PPPStatus and EthStatus projects.")
    (license license:gpl2+)))

(define-public nload
  (package
    (name "nload")
    (version "0.7.4")
    (source (origin
              (method url-fetch)
              (uri (string-append "mirror://sourceforge/nload/nload/" version
                                  "/nload-" version ".tar.gz"))
              (sha256
               (base32
                "1rb9skch2kgqzigf19x8bzk211jdfjfdkrcvaqyj89jy2pkm3h61"))))
    (build-system gnu-build-system)
    (inputs `(("ncurses" ,ncurses)))
    (home-page "http://www.roland-riegel.de/nload/")
    (synopsis "Realtime console network usage monitor")
    (description
     "Nload is a console application which monitors network traffic and
bandwidth usage in real time.  It visualizes the in- and outgoing traffic using
two graphs and provides additional info like total amount of transfered data
and min/max network usage.")
    (license license:gpl2+)))

(define-public iodine
  (package
    (name "iodine")
    (version "0.7.0")
    (source (origin
              (method url-fetch)
              (uri (string-append "http://code.kryo.se/" name "/"
                                  name "-" version ".tar.gz"))
              (sha256
               (base32
                "0gh17kcxxi37k65zm4gqsvbk3aw7yphcs3c02pn1c4s2y6n40axd"))))
    (build-system gnu-build-system)
    (arguments
     '(#:phases
       (modify-phases %standard-phases
         (delete 'configure)
         (add-before 'check 'delete-failing-tests
           ;; Avoid https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=802105
           (lambda _
             (substitute* "tests/common.c"
               (("tcase_add_test\\(tc, \
test_parse_format_ipv(4(|_listen_all|_mapped_ipv6)|6)\\);")
                "")))))
       #:make-flags (list "CC=gcc"
                          (string-append "prefix=" (assoc-ref %outputs "out")))
       #:test-target "test"))
    (inputs `(("zlib" ,zlib)))
    (native-inputs `(("check" ,check)
                     ("pkg-config" ,pkg-config)))
    (home-page "http://code.kryo.se/iodine/")
    (synopsis "Tunnel IPv4 data through a DNS server")
    (description "Iodine tunnels IPv4 data through a DNS server.  This
can be useful in different situations where internet access is firewalled, but
DNS queries are allowed.  The bandwidth is asymmetrical, with limited upstream
and up to 1 Mbit/s downstream.")
    ;; src/md5.[ch] is released under the zlib license
    (license (list license:isc license:zlib))))

(define-public wireshark
  (package
    (name "wireshark")
    (version "2.0.4")
    (synopsis "Network traffic analyzer")
    (source
     (origin
       (method url-fetch)
       (uri (string-append "https://www.wireshark.org/download/src/wireshark-"
                           version ".tar.bz2"))
       (sha256
        (base32
         "19g11m8m8qd7dkcvcb27lyppklg608d9ap7wr3mr88clm4nwiacy"))))
    (build-system glib-or-gtk-build-system)
    (inputs `(("bison" ,bison)
              ("c-ares" ,c-ares)
              ("flex" ,flex)
              ("gnutls" ,gnutls)
              ("gtk+" ,gtk+)
              ("libcap" ,libcap)
              ("libgcrypt" ,libgcrypt)
              ("libnl" ,libnl)
              ("libpcap" ,libpcap)
              ("lua" ,lua)
              ("krb5" ,mit-krb5)
              ("openssl" ,openssl)
              ("portaudio" ,portaudio)
              ("sbc" ,sbc)
              ("zlib" ,zlib)))
    (native-inputs `(("perl" ,perl)
                     ("pkg-config" ,pkg-config)
                     ("python" ,python-wrapper)))
    (arguments
     `(#:configure-flags
       (list (string-append "--with-c-ares=" (assoc-ref %build-inputs "c-ares"))
             (string-append "--with-krb5=" (assoc-ref %build-inputs "krb5"))
             (string-append "--with-libcap=" (assoc-ref %build-inputs "libcap"))
             (string-append "--with-lua=" (assoc-ref %build-inputs "lua"))
             (string-append "--with-pcap=" (assoc-ref %build-inputs "libpcap"))
             (string-append "--with-portaudio="
                             (assoc-ref %build-inputs "portaudio"))
             (string-append "--with-sbc=" (assoc-ref %build-inputs "sbc"))
             (string-append "--with-ssl=" (assoc-ref %build-inputs "openssl"))
             (string-append "--with-zlib=" (assoc-ref %build-inputs "zlib"))
             "--without-qt")))
    (description "Wireshark is a network protocol analyzer, or @dfn{packet
sniffer}, that lets you capture and interactively browse the contents of
network frames.")
    (license license:gpl2+)
    (home-page "https://www.wireshark.org/")))

(define-public httping
  (package
    (name "httping")
    (version "2.4")
    (source
     (origin
       (method url-fetch)
       (uri (string-append "https://www.vanheusden.com/httping/httping-"
                           version ".tgz"))
       (sha256
        (base32
         "1110r3gpsj9xmybdw7w4zkhj3zmn5mnv2nq0ijbvrywbn019zdfs"))))
    (build-system gnu-build-system)
    (native-inputs
     `(("gettext" ,gnu-gettext)))
    (inputs
     `(("fftw" ,fftw)
       ("ncurses" ,ncurses)
       ("openssl" ,openssl)))
    (arguments
     `(#:make-flags (list "CC=gcc"
                          (string-append "DESTDIR=" (assoc-ref %outputs "out"))
                          "PREFIX=")
       #:tests? #f)) ; no tests
    (home-page "https://www.vanheusden.com/httping/")
    (synopsis "Web server latency and throughput monitor")
    (description
     "httping measures how long it takes to connect to a web server, send an
HTTP(S) request, and receive the reply headers.  It is somewhat similar to
@command{ping}, but can be used even in cases where ICMP traffic is blocked
by firewalls or when you want to monitor the response time of the actual web
application stack itself.")
    (license license:gpl2)))        ; with permission to link with OpenSSL

(define-public perl-net-dns
 (package
  (name "perl-net-dns")
  (version "1.06")
  (source
    (origin
      (method url-fetch)
      (uri (string-append
             "mirror://cpan/authors/id/N/NL/NLNETLABS/Net-DNS-"
             version
             ".tar.gz"))
      (sha256
        (base32
          "07m5331132h9xkh1i6jv9d80f571yva27iqa31aq4sm31iw7nn53"))))
  (build-system perl-build-system)
  (inputs
    `(("perl-digest-hmac" ,perl-digest-hmac)))
  (home-page "http://search.cpan.org/dist/Net-DNS")
  (synopsis
    "Perl Interface to the Domain Name System")
  (description "Net::DNS is the Perl Interface to the Domain Name System.")
  (license license:x11)))

(define-public perl-socket6
 (package
  (name "perl-socket6")
  (version "0.28")
  (source
    (origin
      (method url-fetch)
      (uri (string-append
             "mirror://cpan/authors/id/U/UM/UMEMOTO/Socket6-"
             version
             ".tar.gz"))
      (sha256
        (base32
          "11j5jzqbzmwlws9zals43ry2f1nw9qy6im7yhn9ck5rikywrmm5z"))))
  (build-system perl-build-system)
  (arguments
   `(#:phases
     (modify-phases %standard-phases
         (replace 'configure
           (lambda* (#:key outputs #:allow-other-keys)
             (let* ((out (assoc-ref outputs "out"))
                    (args `("Makefile.PL"
                            ,(string-append "PREFIX=" out)
                            "INSTALLDIRS=site")))
                   (setenv "CONFIG_SHELL" (which "sh"))
                   (zero? (apply system* "perl" args))))))))
  (home-page "http://search.cpan.org/dist/Socket6")
  (synopsis
    "IPv6 related part of the C socket.h defines and structure manipulators for Perl")
  (description "Socket6 binds the IPv6 related part of the C socket header
definitions and structure manipulators for Perl.")
  (license license:bsd-3)))

(define-public perl-net-dns-resolver-programmable
 (package
  (name "perl-net-dns-resolver-programmable")
  (version "v0.003")
  (source
    (origin
      (method url-fetch)
      (uri (string-append
             "mirror://cpan/authors/id/J/JM/JMEHNLE/net-dns-resolver-programmable/"
             "Net-DNS-Resolver-Programmable-" version ".tar.gz"))
      (sha256
        (base32
          "1v3nl2kaj4fs55n1617n53q8sa3mir06898vpy1rq98zjih24h4d"))
      (patches
       (list (origin
               (method url-fetch)
               (uri "https://rt.cpan.org/Public/Ticket/Attachment/1575108/841078/patch.txt")
               (sha256
                 (base32
                   "027fzq1dryqwhkprz4r32vj78qfdnx1mhjx6piag7p62p5npmdic")))))))
  (build-system perl-build-system)
  (native-inputs
    `(("perl-module-build" ,perl-module-build)))
  (inputs `(("perl-net-dns" ,perl-net-dns)))
  (home-page
    "http://search.cpan.org/dist/Net-DNS-Resolver-Programmable")
  (synopsis
    "programmable DNS resolver class for offline
emulation of DNS")
  (description "Net::DNS::Resolver::Programmable is a programmable DNS resolver for
offline emulation of DNS.")
  (license (package-license perl))))

(define-public perl-netaddr-ip
 (package
  (name "perl-netaddr-ip")
  (version "4.079")
  (source
    (origin
      (method url-fetch)
      (uri (string-append
             "mirror://cpan/authors/id/M/MI/MIKER/NetAddr-IP-"
             version
             ".tar.gz"))
      (sha256
        (base32
          "1rx0dinrz9fk9qcg4rwqq5n1dm3xv2arymixpclcv2q2nzgq4npc"))))
  (build-system perl-build-system)
  (arguments
    `(#:phases
       (modify-phases %standard-phases
         (replace 'configure
           (lambda* (#:key outputs #:allow-other-keys)
             (let* ((out (assoc-ref outputs "out"))
                    (args `("Makefile.PL"
                            ,(string-append "PREFIX=" out)
                            "INSTALLDIRS=site")))
                   (setenv "CONFIG_SHELL" (which "sh"))
                   (zero? (apply system* "perl" args))))))))
  (home-page
    "http://search.cpan.org/dist/NetAddr-IP")
  (synopsis
    "Manages IPv4 and IPv6 addresses and subnets")
  (description "NetAddr::IP manages IPv4 and IPv6 addresses and subsets.")
  (license (package-license perl))))

;; Maybe makes sense to add patricialib dependency (it's bundled right now).
;; See <http://www.mrtd.net/> for the original package it was extracted from.
;; However, the site above doesn't actually work on my computer.
(define-public perl-net-patricia
 (package
  (name "perl-net-patricia")
  (version "1.22")
  (source
    (origin
      (method url-fetch)
      (uri (string-append
             "mirror://cpan/authors/id/G/GR/GRUBER/Net-Patricia-"
             version
             ".tar.gz"))
      (sha256
        (base32
          "0ln5f57vc8388kyh9vhx2infrdzfhbpgyby74h1qsnhwds95m0vh"))))
  (build-system perl-build-system)
  (inputs
    `(("perl-net-cidr-lite" ,perl-net-cidr-lite)
      ("perl-socket6" ,perl-socket6)))
  (home-page
    "http://search.cpan.org/dist/Net-Patricia")
  (synopsis
    "Patricia Trie Perl module for fast IP address lookups")
  (description
    "Net::Patricia does IP address lookups quickly in Perl.")
  ;; The bindings are licensed under GPL2 or later.
  ;; libpatricia is licensed under 2-clause BSD.
  (license (list license:gpl2+ license:bsd-2))))

(define-public perl-net-cidr-lite
 (package
  (name "perl-net-cidr-lite")
  (version "0.21")
  (source
    (origin
      (method url-fetch)
      (uri (string-append
             "mirror://cpan/authors/id/D/DO/DOUGW/Net-CIDR-Lite-"
             version
             ".tar.gz"))
      (sha256
        (base32
          "14shj73zbqmfjbp0qz1fs9j4p2dpvz5hfkm4qfdjbydflbl2b8fg"))))
  (build-system perl-build-system)
  (home-page
    "http://search.cpan.org/dist/Net-CIDR-Lite")
  (synopsis
    "Perl extension for merging IPv4 or IPv6 CIDR addresses")
  (description "Net::CIDR::Lite merges IPv4 or IPv6 CIDR addresses.")
  (license license:gpl1+)))

;; TODO: Use the geolite-mirror-simple.pl script from the example
;; directory to stay current with the databases. How?
(define-public perl-geo-ip
 (package
  (name "perl-geo-ip")
  (version "1.45")
  (source
    (origin
      (method url-fetch)
      (uri (string-append
             "mirror://cpan/authors/id/M/MA/MAXMIND/Geo-IP-"
             version
             ".tar.gz"))
      (sha256
        (base32
          "0qinkq2br1cjicbgqb5bvrhm73h7f9f4fgc6bjfs5r6x7316bdqf"))))
  (build-system perl-build-system)
  (home-page "http://search.cpan.org/dist/Geo-IP")
  (synopsis
    "Look up location and network information by IP Address in Perl")
  (description "The Perl module 'Geo::IP'. 
It looks up location and network information by IP Address.")
  (license (package-license perl))))

(define-public perl-io-socket-inet6
 (package
  (name "perl-io-socket-inet6")
  (version "2.72")
  (source
    (origin
      (method url-fetch)
      (uri (string-append
             "mirror://cpan/authors/id/S/SH/SHLOMIF/IO-Socket-INET6-"
             version
             ".tar.gz"))
      (sha256
        (base32
          "1fqypz6qa5rw2d5y2zq7f49frwra0aln13nhq5gi514j2zx21q45"))))
  (build-system perl-build-system)
  (native-inputs
    `(("perl-module-build" ,perl-module-build)
      ("perl-test-pod" ,perl-test-pod)
      ("perl-test-pod-coverage" ,perl-test-pod-coverage)
      ;; this doesn't actually work if we do add it.
      #| ("perl-test-trailingspace" ,perl-test-trailingspace) |#))
  (inputs `(("perl-socket6" ,perl-socket6)))
  (arguments `(;; Need network socket API
               #:tests? #f))
  (home-page
    "http://search.cpan.org/dist/IO-Socket-INET6")
  (synopsis
    "Perl object interface for AF_INET/AF_INET6 domain sockets")
  (description "IO::Socket::INET6 is an interface for
AF_INET/AF_INET6 domain sockets in Perl.")
  (license (package-license perl))))