#!/bin/sh
#
#  anytun
#
#  The secure anycast tunneling protocol (satp) defines a protocol used
#  for communication between any combination of unicast and anycast
#  tunnel endpoints.  It has less protocol overhead than IPSec in Tunnel
#  mode and allows tunneling of every ETHER TYPE protocol (e.g.
#  ethernet, ip, arp ...). satp directly includes cryptography and
#  message authentication based on the methods used by SRTP.  It is
#  intended to deliver a generic, scaleable and secure solution for
#  tunneling and relaying of packets of any protocol.
#
#
#  Copyright (C) 2007-2014 Markus Grüneis, Othmar Gsenger, Erwin Nindl,
#                          Christian Pointner <satp@wirdorange.org>
#
#  This file is part of Anytun.
#
#  Anytun 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
#  any later version.
#
#  Anytun 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 Anytun.  If not, see <http://www.gnu.org/licenses/>.
#
#  In addition, as a special exception, the copyright holders give
#  permission to link the code of portions of this program with the
#  OpenSSL library under certain conditions as described in each
#  individual source file, and distribute linked combinations
#  including the two.
#  You must obey the GNU General Public License in all respects
#  for all of the code used other than OpenSSL.  If you modify
#  file(s) with this exception, you may extend this exception to your
#  version of the file(s), but you are not obligated to do so.  If you
#  do not wish to do so, delete this exception statement from your
#  version.  If you delete this exception statement from all source
#  files in the program, then also delete it here.
#

TARGET=`uname -s`

EBUILD_COMPAT=0

CROSS_PREFIX=''

USE_CLANG=0

CRYPTO_LIB='gcrypt'
PASSPHRASE=1
ROUTING=1

PREFIX='/usr/local'
BINDIR=''
SBINDIR=''
LIBDIR=''
ETCDIR=''
MANDIR=''
INSTALLMANPAGE=1
EXAMPLESDIR=''
INSTALLEXAMPLES=1
SYSTEMDDIR=''
SYSTEMDGENERATORDIR=''
TMPFILESDDIR=''
INSTALLSYSTEMD=1

BOOST_PREFIX=''
GCRYPT_PREFIX=''
NETTLE_PREFIX=''
OPENSSL_PREFIX=''

print_usage() {
  echo "configure --help                             print this"
  echo "          --target=<TARGET>                  build target i.e. Linux (default: autodetect)"
  echo "          --prefix=<PREFIX>                  the installation prefix (default: /usr/local)"
  echo "          --bindir=<DIR>                     the path to the bin directory (default: $PREFIX/bin)"
  echo "          --sbindir=<DIR>                    the path to the sbin directory (default: $PREFIX/sbin)"
  echo "          --libdir=<DIR>                     the path to the lib directory (default: $PREFIX/lib)"
  echo "          --sysconfdir=<DIR>                 the path to the system configuration directory (default: $PREFIX/etc"
  echo "          --mandir=<DIR>                     the path to the system man pages (default: $PREFIX/share/man)"
  echo "          --no-manpage                       don't install manpages"
  echo "          --examplesdir=<DIR>                the path to the examples files (default: $PREFIX/share/examples)"
  echo "          --no-examples                      don't install example files"
  echo "          --systemddir=<DIR>                 the path to the systemd service unit directory (default: from pkg-config)"
  echo "          --systemdgeneratordir=<DIR>        the path to the systemd generator directory (default: from pkg-config)"
  echo "          --tmpfilesddir=<DIR>               the path to the systemd tmpfiles.d configuration file (default: from pkg-config)"
  echo "          --no-systemd                       don't install systemd units"
  echo "          --use-gcrypt                       use libgcrypt (this is the default)"
  echo "          --use-nettle                       use libnettle instead of libgcrypt"
  echo "          --use-ssl-crypto                   use openssl crypto library instead of libgcrypt"
  echo "          --no-crypto                        disable crypto at all (only NULL cipher)"
  echo "          --disable-passphrase               disable master key and salt passphrase"
  echo "          --enable-passphrase                enable master key and salt passphrase"
  echo "          --disable-routing                  disable built-in routing capability"
  echo "          --enable-routing                   enable built-in routing capability"
  echo "          --cross-prefix=<PREFIX>            add PREFIX to compiler calls"
  echo "          --with-boost=<PREFIX>              don't use systemwide boost"
  echo "          --with-gcrypt=<PREFIX>             don't use systemwide gcrypt"
  echo "          --with-nettle=<PREFIX>             don't use systemwide nettle"
  echo "          --with-openssl=<PREFIX>            don't use systemwide openssl"
  echo "          --use-clang                        use clang/llvm as compiler/linker"
}

for arg
do
  case $arg in
  --target=*)
    TARGET=${arg#--target=}
  ;;
  --use-clang)
    USE_CLANG=1
  ;;
  --prefix=*)
    PREFIX=${arg#--prefix=}
  ;;
  --bindir=*)
    SBINDIR=${arg#--bindir=}
  ;;
  --sbindir=*)
    SBINDIR=${arg#--sbindir=}
  ;;
  --libdir=*)
    LIBDIR=${arg#--libdir=}
  ;;
  --sysconfdir=*)
    ETCDIR=${arg#--sysconfdir=}
  ;;
  --mandir=*)
    MANDIR=${arg#--mandir=}
  ;;
  --no-manpage)
    INSTALLMANPAGE=0
  ;;
  --examplesdir=*)
    EXAMPLESDIR=${arg#--examplesdir=}
  ;;
  --no-examples)
    INSTALLEXAMPLES=0
  ;;
  --systemddir=*)
    SYSTEMDDIR=${arg#--systemddir=}
  ;;
  --systemdgeneratordir=*)
    SYSTEMDGENERATORDIR=${arg#--systemdgeneratordir=}
  ;;
  --tmpfilesddir=*)
    TMPFILESDDIR=${arg#--tmpfilesddir=}
  ;;
  --no-systemd)
    INSTALLSYSTEMD=0
  ;;
  --use-gcrypt)
    CRYPTO_LIB='gcrypt'
  ;;
  --use-nettle)
    CRYPTO_LIB='nettle'
  ;;
  --use-ssl-crypto)
    CRYPTO_LIB='ssl'
  ;;
  --no-crypto)
    CRYPTO_LIB='none'
  ;;
  --enable-passphrase)
    PASSPHRASE=1
  ;;
  --disable-passphrase)
    PASSPHRASE=0
  ;;
  --enable-routing)
    ROUTING=1
  ;;
  --disable-routing)
    ROUTING=0
  ;;
  --ebuild-compat)
    EBUILD_COMPAT=1
  ;;
  --cross-prefix=*)
    CROSS_PREFIX=${arg#--cross-prefix=}
  ;;
  --with-boost=*)
    BOOST_PREFIX=${arg#--with-boost=}
  ;;
  --with-gcrypt=*)
    GCRYPT_PREFIX=${arg#--with-gcrypt=}
  ;;
  --with-nettle=*)
    NETTLE_PREFIX=${arg#--with-nettle=}
  ;;
  --with-openssl=*)
    OPENSSL_PREFIX=${arg#--with-openssl=}
  ;;
  --help)
    print_usage
    exit 0
  ;;
  *)
    ERRORS="$ERRORS $arg"
  ;;
  esac
done

if [ -n "$ERRORS" ] && [ $EBUILD_COMPAT -ne 1 ]; then
  for error in $ERRORS; do
    echo "Unknown argument: $error"
  done

  print_usage
  exit 1
fi

if [ $USE_CLANG -eq 0 ]; then
  if [ -z "$CXXFLAGS" ]; then CXXFLAGS='-g -Wall -O2'; fi
  if [ -z "$LDFLAGS" ]; then LDFLAGS='-g -Wall -O2'; fi
  COMPILER='g++'
else
  if [ -z "$CXXFLAGS" ]; then CXXFLAGS='-g -O2'; fi
  if [ -z "$LDFLAGS" ]; then LDFLAGS='-g -O2'; fi
  COMPILER='clang++'
fi

rm -f include.mk
rm -f version.h
case $TARGET in
  Linux)
    rm -f tunDevice.cpp
    ln -sf linux/tunDevice.cpp
    rm -f signalHandler.hpp
    ln -sf posix/signalHandler.hpp
    rm -f sysExec.hpp
    ln -sf posix/sysExec.hpp
    rm -f daemonService.h daemonService.cpp
    ln -sf posix/posixDaemon.h daemonService.h
    ln -sf posix/posixDaemon.cpp daemonService.cpp
    echo "loading Linux specific TUN Device"
    LDFLAGS=$LDFLAGS' -lboost_thread -lboost_serialization -lboost_system -lboost_date_time -lpthread'
    LOG_TARGETS='-DLOG_SYSLOG -DLOG_FILE -DLOG_STDOUT'
  ;;
  OpenBSD|FreeBSD|NetBSD|GNU/kFreeBSD)
    rm -f tunDevice.cpp
    ln -sf bsd/tunDevice.cpp
    rm -f signalHandler.hpp
    ln -sf posix/signalHandler.hpp
    rm -f sysExec.hpp
    ln -sf posix/sysExec.hpp
    rm -f daemonService.h daemonService.cpp
    ln -sf posix/posixDaemon.h daemonService.h
    ln -sf posix/posixDaemon.cpp daemonService.cpp
    echo "loading BSD specific TUN Device"
    CPPFLAGS=$CPPFLAGS' -I/usr/local/include'
    LDFLAGS=$LDFLAGS' -L/usr/local/lib -lboost_thread -lboost_serialization -lboost_system -lboost_date_time -lpthread'
    LOG_TARGETS='-DLOG_SYSLOG -DLOG_FILE -DLOG_STDOUT'
    INSTALLSYSTEMD=0
  ;;
  mingw)
    rm -f tunDevice.cpp
    rm -f signalHandler.hpp
    rm -f sysExec.hpp
    rm -f daemonService.h daemonService.cpp
    echo "loading Windows specific TUN Device"
    CPPFLAGS=$CPPFLAGS' -DMINGW -D_WIN32_WINNT=0x0501 -DWIN32_LEAN_AND_MEAN -DBOOST_WINDOWS -fno-strict-aliasing -DBOOST_THREAD_USE_LIB'
    LDFLAGS=$LDFLAGS'  -lboost_thread_win32 -lboost_serialization -lboost_system -lboost_date_time -lwsock32 -lws2_32'
    LOG_TARGETS='-DWIN_EVENTLOG -DLOG_FILE -DLOG_STDOUT'
    INSTALLSYSTEMD=0
  ;;
  *)
    echo "platform not supported"
    exit 1
  ;;
esac

CPPFLAGS="$CPPFLAGS $LOG_TARGETS"

if [ -n "$BOOST_PREFIX" ]; then
  CPPFLAGS="$CPPFLAGS -I\"$BOOST_PREFIX/include\""
  LDFLAGS="$LDFLAGS -L\"$BOOST_PREFIX/lib\""
fi

CRYPTO_LIB_NAME=""
case $CRYPTO_LIB in
  gcrypt)
    CPPFLAGS=$CPPFLAGS' -DUSE_GCRYPT'
    LDFLAGS=$LDFLAGS' -lgcrypt -lgpg-error'
    if [ -n "$GCRYPT_PREFIX" ]; then
      CPPFLAGS="$CPPFLAGS -I\"$GCRYPT_PREFIX/include\""
      LDFLAGS="$LDFLAGS -L\"$GCRYPT_PREFIX/lib\""
    fi
    CRYPTO_LIB_NAME="libgcrypt"
    echo "using gcrypt library"
  ;;
  nettle)
    CPPFLAGS=$CPPFLAGS' -DUSE_NETTLE'
    LDFLAGS=$LDFLAGS' -lnettle'
    if [ -n "$NETTLE_PREFIX" ]; then
      CPPFLAGS="$CPPFLAGS -I\"$NETTLE_PREFIX/include\""
      LDFLAGS="$LDFLAGS -L\"$NETTLE_PREFIX/lib\""
    fi
    CRYPTO_LIB_NAME="Nettle"
    echo "using nettle library"
  ;;
  ssl)
    CPPFLAGS=$CPPFLAGS' -DUSE_SSL_CRYPTO'
    LDFLAGS=$LDFLAGS' -lcrypto'
    if [ -n "$OPENSSL_PREFIX" ]; then
      CPPFLAGS="$CPPFLAGS -I\"$OPENSSL_PREFIX/include\""
      LDFLAGS="$LDFLAGS -L\"$OPENSSL_PREFIX/lib\""
    fi
    CRYPTO_LIB_NAME="OpenSSL"
    echo "using openssl crypto library"
  ;;
  none)
    CPPFLAGS=$CPPFLAGS' -DNO_CRYPT'
    CRYPTO_LIB_NAME="none"
    echo "disabling crypto"
  ;;
esac

if [ $PASSPHRASE -eq 0 ]; then
  CPPFLAGS=$CPPFLAGS' -DNO_PASSPHRASE'
  echo "disabling master key and salt passphrase"
fi

if [ $ROUTING -eq 0 ]; then
  CPPFLAGS=$CPPFLAGS' -DNO_ROUTING'
  echo "disabling built-in routing capability"
fi

if [ -z "$BINDIR" ]; then
  BINDIR=$PREFIX/bin
fi

if [ -z "$SBINDIR" ]; then
  SBINDIR=$PREFIX/sbin
fi

if [ -z "$LIBDIR" ]; then
  LIBDIR=$PREFIX/lib
fi

if [ -z "$ETCDIR" ]; then
  ETCDIR=$PREFIX/etc
fi

if [ -z "$MANDIR" ]; then
  MANDIR=$PREFIX/share/man
fi

if [ -z "$EXAMPLESDIR" ]; then
  EXAMPLESDIR=$PREFIX/share/examples
fi

if [ $INSTALLSYSTEMD -eq 1 ]; then
  if [ -z "$SYSTEMDDIR" ]; then
    SYSTEMDDIR=`pkg-config systemd --variable=systemdsystemunitdir`
  fi
  if [ -z "$SYSTEMDGENERATORDIR" ]; then
    SYSTEMDGENERATORDIR=`pkg-config systemd --variable=systemdsystemgeneratordir`
  fi
  if [ -z "$TMPFILESDDIR" ]; then
    TMPFILESDDIR=`pkg-config systemd --variable=tmpfilesdir`
  fi
fi

cat > include.mk <<EOF
# this file was created automatically
# do not edit this file directly
# use ./configure instead

TARGET := $TARGET
CXX := ${CROSS_PREFIX}$COMPILER
CPPFLAGS := $CPPFLAGS
CXXFLAGS := $CXXFLAGS
LD := ${CROSS_PREFIX}$COMPILER
LDFLAGS := $LDFLAGS
STRIP := ${CROSS_PREFIX}strip
INSTALL := install

prefix := $PREFIX
BINDIR := $BINDIR
SBINDIR := $SBINDIR
LIBDIR := $LIBDIR
ETCDIR := $ETCDIR
EOF

if [ $CRYPTO_LIB = "none" ]; then
  echo "NO_CRYPT_OBJ = 1" >> include.mk
fi

if [ $INSTALLMANPAGE -eq 1 ]; then
  echo "MANDIR := $MANDIR" >> include.mk
  echo "installing manpage"
else
  echo "not installing manpage"
fi

if [ $INSTALLEXAMPLES -eq 1 ]; then
  echo "EXAMPLESDIR := $EXAMPLESDIR" >> include.mk
  echo "installing example files"
else
  echo "not installing example files"
fi

if [ $INSTALLSYSTEMD -eq 1 ]; then
  echo "SYSTEMDDIR := $SYSTEMDDIR" >> include.mk
  echo "SYSTEMDGENERATORDIR := $SYSTEMDGENERATORDIR" >> include.mk
  echo "TMPFILESDDIR := $TMPFILESDDIR" >> include.mk
  echo "installing systemd units"
else
  echo "not installing systemd units"
fi

VERSION=`cat ../version`
if which git >/dev/null; then
    GIT_HASH=`git rev-parse HEAD 2> /dev/null`
    if [ -n "$GIT_HASH" ]; then
        VERSION="$VERSION (git $GIT_HASH)"
    fi
fi

cat > version.h <<EOF
/*
 * anytun version info
 *
 * this file was created automatically
 * do not edit this file directly
 * use ./configure instead
 */

#ifndef ANYTUN_version_h_INCLUDED
#define ANYTUN_version_h_INCLUDED

#define VERSION_STRING " version $VERSION"
#define CRYPTO_LIB_NAME "$CRYPTO_LIB_NAME"

#endif
EOF

exit 0