#!/bin/sh
# Try and be like autotools configure, but without autotools

# Ensure that we do not inherit these from env
HOOKSET=false
ARC4RANDOM=
CLOSEFROM=
GETLINE=
STRLCPY=
OS=
BUILD=
HOST=
TARGET=
DEBUG=
FORK=
STATIC=
INCLUDEDIR=

for x do
	opt=${x%%=*}
	var=${x#*=}
	case "$opt" in
	--os|OS) OS=$var;;
	--with-cc|CC) CC=$var;;
	--debug) DEBUG=$var;;
	--disable-debug) DEBUG=no;;
	--enable-debug) DEBUG=yes;;
	--fork) FORK=$var;;
	--disable-fork) FORK=no;;
	--enable-fork) FORK=yes;;
	--disable-static) STATIC=no;;
	--enable-static) STATIC=yes;;
	--prefix) prefix=$var;;
	--sysconfdir) SYSCONFDIR=$var;;
	--bindir|--sbindir) SBINDIR=$var;;
	--libexecdir) LIBEXECDIR=$var;;
	--statedir|--localstatedir) STATEDIR=$var;;
	--dbdir) DBDIR=$var;;
	--rundir) RUNDIR=$var;;
	--mandir) MANDIR=$var;;
	--with-ccopts|CFLAGS) CFLAGS=$var;;
	CPPFLAGS) CPPFLAGS=$var;;
	--with-hook) HOOKSCRIPTS="$HOOKSCRIPTS${HOOKSCRIPTS:+ }$var";;
	--with-hooks|HOOKSCRIPTS) HOOKSCRIPTS=$var; HOOKSET=true;;
	--build) BUILD=$var;;
	--host) HOST=$var;;
	--target) TARGET=$var;;
	--libdir) LIBDIR=$var;;
	--without-arc4random) ARC4RANDOM=no;;
	--without-closefrom) CLOSEFROM=no;;
	--without-getline) GETLINE=no;;
	--without-strlcpy) STRLCPY=no;;
	--serviceexists) SERVICEEXISTS=$var;;
	--servicecmd) SERVICECMD=$var;;
	--servicestatus) SERVICESTATUS=$var;;
	--includedir) eval INCLUDEDIR="$INCLUDEDIR${INCLUDEDIR:+ }$var";;
	--datadir|--infodir) ;; # ignore autotools
	--disable-maintainer-mode|--disable-dependency-tracking) ;;
	--help) echo "See the README file for available options"; exit 0;;
	*) echo "$0: WARNING: unknown option $opt" >&2;;
	esac
done

: ${SED:=sed}

: ${FORK:=yes}
: ${PREFIX:=$prefix}
: ${SYSCONFDIR:=$PREFIX/etc}
: ${SBINDIR:=$PREFIX/sbin}
: ${LIBDIR:=$PREFIX/lib}
: ${LIBEXECDIR:=$PREFIX/libexec}
: ${STATEDIR:=/var}
: ${DBDIR:=$STATEDIR/db}
: ${RUNDIR:=$STATEDIR/run}
: ${MANDIR:=${PREFIX:-/usr}/share/man}

eval SYSCONFDIR="$SYSCONFDIR"
eval LIBDIR="$LIBDIR"
eval LIBEXECDIR="$LIBEXECDIR"
eval STATEDIR="$STATEDIR"
eval DBDIR="$DBDIR"
eval RUNDIR="$RUNDIR"
eval MANDIR="$MANDIR"

_which()
{
	x="$(which "$1" 2>/dev/null)"
	if [ -n "$x" ]; then
		echo "$x"
		return 0
	fi
	for x in /sbin/"$1" /usr/sbin/"$1" \
		/usr/pkg/sbin/"$1" /usr/local/sbin/"$1"
	do
		if [ -e "$x" ]; then
			echo "$x"
			return 0
		fi
	done
	return 1
}

CONFIG_H=config.h
CONFIG_MK=config.mk

if [ -z "$BUILD" ]; then
	BUILD=`uname -m`-`uname -s | tr '[:upper:]' '[:lower:]'`
fi
if [ -z "$HOST" ]; then
	[ -z "$TARGET" ] && TARGET=$BUILD
	HOST=$TARGET
fi
if [ -z "$TARGET" ]; then
	[ -z "$HOST" ] && HOST=$BUILD
	TARGET=$HOST
fi

# Debian and Slackware have linux in different places when dealing with
# autoconf, so we deal with that here.
if [ -z "$OS" ]; then
	case "$TARGET" in
	*-linux-*|linux-*|*-linux|linux) OS=linux;;
	esac
fi

if [ -z "$OS" ]; then
	# Derive OS from cpu-manufacturer-os-kernel
	CPU=${TARGET%%-*}
	REST=${TARGET#*-}
	if [ "$CPU" != "$REST" ]; then
		MANU=${REST%%-*}
		REST=${REST#*-}
		if [ "$MANU" != "$REST" ]; then
			OS=${REST%%-*}
			REST=${REST#*-}
			if [ "$OS" != "$REST" ]; then
				KERNEL=${REST%%-*}
			else
				# 3 tupple
				KERNEL=$OS
				OS=$MANU
				MANU=
			fi
		else
			# 2 tupple
			OS=$MANU
			MANU=
		fi
	fi
fi

echo "Configuring dhcpcd for ... $OS"
rm -f $CONFIG_H $CONFIG_MK
echo "# $OS" >$CONFIG_MK
echo "/* $OS */" >$CONFIG_H

for x in SYSCONFDIR SBINDIR LIBEXECDIR DBDIR RUNDIR; do
	eval v=\$$x
	# Make files look nice for import
	l=$((10 - ${#x}))
	unset t
	[ $l -gt 3 ] && t="	"
	echo "$x=$t	$v" >>$CONFIG_MK
	unset t
	[ $l -gt 2 ] && t="	"
	echo "#define $x$t	\"$v\"" >>$CONFIG_H
done
echo "LIBDIR=		$LIBDIR" >>$CONFIG_MK
echo "MANDIR=		$MANDIR" >>$CONFIG_MK

if [ -z "$CC" ]; then
	printf "Looking for compiler ... "
	for b in $TARGET- ""; do
		for cc in gcc clang pcc icc cc; do
			if type $b$cc >/dev/null 2>&1; then
				CC=$b$cc
				echo "$CC"
				break
			fi
		done
		[ -n "$CC" ] && break
	done
	if [ -z "$CC" ]; then
		echo
		echo "no suitable compiler found - aborting" >&2
		exit 1
	fi
else
	echo "Using compiler $CC"
fi
$CC --version | $SED -e '1!d'
echo "CC=		$CC" >>$CONFIG_MK

if [ -n "$CFLAGS" ]; then
	echo "CFLAGS=		$CFLAGS" >>$CONFIG_MK
fi
if [ -n "$CPPLAGS" ]; then
	echo "CPPLAGS=		$CPPLAGS" >>$CONFIG_MK
fi
if [ -n "$LDFLAGS" ]; then
	echo "LDFLAGS=		$LDFLAGS" >>$CONFIG_MK
fi
if [ "$STATIC" = yes ]; then
	echo "LDFLAGS+=	-static" >>$CONFIG_MK
fi
for x in $INCLUDEDIR; do
	echo "CPPFLAGS+=	-I$x" >>$CONFIG_MK
done

if [ -n "$DEBUG" -a "$DEBUG" != no -a "$DEBUG" != false ]; then
	echo "Enabling memory debugging"
	echo "CPPFLAGS+=	-DDEBUG_MEMORY" >>$CONFIG_MK
elif [ -z "$DEBUG" -a -d .git ]; then
	printf "Found git ... "
	DEBUG=yes
	echo "CFLAGS+=		-ggdb" >>$CONFIG_MK
else
	DEBUG=no
fi
if [ "$DEBUG" != no -a "$DEBUG" != false ]; then
	echo "Adding debugging CFLAGS"
	cat <<EOF >>$CONFIG_MK
CFLAGS+=	-Wall -Wextra -Wimplicit -Wshadow -Wformat=2
CFLAGS+=	-Wmissing-prototypes -Wmissing-declarations
CFLAGS+=	-Wmissing-noreturn -Wmissing-format-attribute
CFLAGS+=	-Wredundant-decls  -Wnested-externs
CFLAGS+=	-Winline -Wwrite-strings -Wcast-align -Wcast-qual
CFLAGS+=	-Wpointer-arith -Wstrict-overflow
CFLAGS+=	-Wdeclaration-after-statement -Wsequence-point
CFLAGS+=	-fno-common
EOF
fi

if [ -n "$FORK" -a "$FORK" != yes -a "$FORK" != true ]; then
	echo "There is no fork"
	echo "CPPFLAGS+=	-DTHERE_IS_NO_FORK" >>$CONFIG_MK
fi

case "$OS" in
linux)
	echo "CPPFLAGS+=	-D_BSD_SOURCE -D_XOPEN_SOURCE=600" >>$CONFIG_MK
	echo "SRCS+=		if-linux.c if-linux-wireless.c lpf.c" >>$CONFIG_MK
	echo "SRCS+=		platform-linux.c" >>$CONFIG_MK
	echo "LDADD+=		-lrt" >>$CONFIG_MK
	;;
kfreebsd)
	echo "CPPFLAGS+=	-D_GNU_SOURCE" >>$CONFIG_MK
	echo "SRCS+=		bpf.c if-bsd.c platform-bsd.c" >>$CONFIG_MK
	echo "COMPAT_SRCS+=	compat/linkaddr.c" >>$CONFIG_MK
	echo "LDADD+=		-lrt" >>$CONFIG_MK
	;;
*)
	echo "SRCS+=		bpf.c if-bsd.c platform-bsd.c" >>$CONFIG_MK
	;;
esac

# NetBSD: Even if we build for $PREFIX, the clueless user might move us to /
LDELF=/libexec/ld.elf_so
if [ -e "$LDELF" ]; then
	echo "Linking against $LDELF"
	echo "LDFLAGS+=	-Wl,-dynamic-linker=$LDELF" >>$CONFIG_MK
	echo "LDFLAGS+=	-Wl,-rpath=${LIBDIR}" >>$CONFIG_MK
fi

# Add CPPFLAGS and CFLAGS to CC for testing features
XCC="$CC `$SED -n -e 's/CPPLAGS+=*\(.*\)/\1/p' $CONFIG_MK`"
XCC="$XCC `$SED -n -e 's/CFLAGS+=*\(.*\)/\1/p' $CONFIG_MK`"

abort=false
# We require the libc to support non standard functions, like getifaddrs
printf "Testing for getifaddrs ... "
cat <<EOF >_getifaddrs.c
#include <sys/types.h>
#include <ifaddrs.h>
int main(void) {
	struct ifaddrs *ifap;
	return getifaddrs(&ifap);
}
EOF
if $XCC _getifaddrs.c -o _getifaddrs 2>/dev/null; then
	echo "yes"
else
	echo "no"
	echo "libc support for getifaddrs is required - aborting" >&2
	abort=true
fi
rm -f _getifaddrs.c _getifaddrs
$abort && exit 1

if [ -z "$ARC4RANDOM" ]; then
	printf "Testing for arc4random ... "
	cat <<EOF >_arc4random.c
#include <stdlib.h>
int main(void) {
	arc4random();
	return 0;
}
EOF
	if $XCC _arc4random.c -o _arc4random 2>/dev/null; then
		ARC4RANDOM=yes
	else
		ARC4RANDOM=no
	fi
	echo "$ARC4RANDOM"
	rm -f _arc4random.c _arc4random
fi
if [ "$ARC4RANDOM" = no ]; then
	echo "COMPAT_SRCS+=	compat/arc4random.c" >>$CONFIG_MK
	echo "#include \"compat/arc4random.h\"" >>$CONFIG_H
fi

if [ -z "$CLOSEFROM" ]; then
	printf "Testing for closefrom ... "
	cat <<EOF >_closefrom.c
#include <unistd.h>
int main(void) {
	closefrom(3);
	return 0;
}
EOF
	if $XCC _closefrom.c -o _closefrom 2>/dev/null; then
		CLOSEFROM=yes
	else
		CLOSEFROM=no
	fi
	echo "$CLOSEFROM"
	rm -f _closefrom.c _closefrom
fi
if [ "$CLOSEFROM" = no ]; then
	echo "COMPAT_SRCS+=	compat/closefrom.c" >>$CONFIG_MK
	echo "#include \"compat/closefrom.h\"" >>$CONFIG_H
fi

if [ -z "$GETLINE" ]; then
	printf "Testing for getline ... "
	cat <<EOF >_getline.c
#define _GNU_SOURCE
#include <stdio.h>
int main(void) {
	char *buf = NULL;
	size_t n = 0;
	getline(&buf, &n, stdin);
	return 0;
}
EOF
	if $XCC _getline.c -o _getline 2>/dev/null; then
		GETLINE=yes
	else
		GETLINE=no
	fi
	echo "$GETLINE"
	rm -f _getline.c _getline
fi
if [ "$GETLINE" = no ]; then
	echo "COMPAT_SRCS+=	compat/getline.c" >>$CONFIG_MK
	echo "#include \"compat/getline.h\"" >>$CONFIG_H
fi

if [ -z "$STRLCPY" ]; then
	printf "Testing for strlcpy ... "
	cat <<EOF >_strlcpy.c
#include <string.h>
int main(void) {
	const char s1[] = "foo";
	char s2[10];
	strlcpy(s2, s1, sizeof(s2));
	return 0;
}
EOF
	if $XCC _strlcpy.c -o _strlcpy 2>/dev/null; then
		STRLCPY=yes
	else
		STRLCPY=no
	fi
	echo "$STRLCPY"
	rm -f _strlcpy.c _strlcpy
fi
if [ "$STRLCPY" = no ]; then
	echo "COMPAT_SRCS+=	compat/strlcpy.c" >>$CONFIG_MK
	echo "#include \"compat/strlcpy.h\"" >>$CONFIG_H
fi

if [ -z "$TAILQ_FOREACH_SAFE" ]; then
	printf "Testing for TAILQ_FOREACH_SAFE ... "
	cat <<EOF >_queue.c
#include <sys/queue.h>
int main(void) {
#ifndef TAILQ_FOREACH_SAFE
#error TAILQ_FOREACH_SAFE
#endif
	return 0;
}
EOF
	if $XCC _queue.c -o _queue 2>/dev/null; then
		TAILQ_FOREACH_SAFE=yes
	else
		TAILQ_FOREACH_SAFE=no
	fi
	echo "$TAILQ_FOREACH_SAFE"
	rm -f _queue.c _queue
fi
if [ "$TAILQ_FOREACH_SAFE" = no ]; then
	cat <<EOF >>$CONFIG_H
#define	TAILQ_FOREACH_SAFE(var, head, field, next)			\\
	for ((var) = TAILQ_FIRST((head));				\\
	    (var) && ((next) = TAILQ_NEXT((var), field), 1);		\\
	    (var) = (next))
#define TAILQ_FOREACH_REVERSE_SAFE(var, head, headname, field, prev)	\\
	for ((var) = TAILQ_LAST((head), headname);			\\
	    (var) && ((prev) = TAILQ_PREV((var), headname, field), 1);  \\
	    (var) = (prev))
EOF
fi

if [ -z "$POSIX_SPAWN" ]; then
	printf "Testing for posix_spawn ... "
	cat <<EOF >_posix_spawn.c
#include <spawn.h>
#include <stdlib.h>
int main(void) {
	posix_spawn(NULL, NULL, NULL, NULL, NULL, NULL);
	return 0;
}
EOF
	if $XCC _posix_spawn.c -o _posix_spawn 2>/dev/null; then
		POSIX_SPAWN=yes
	else
		POSIX_SPAWN=no
	fi
	echo "$POSIX_SPAWN"
	rm -f _posix_spawn.c _posix_spawn
fi
if [ "$POSIX_SPAWN" = no ]; then
	echo "COMPAT_SRCS+=	compat/posix_spawn.c" >>$CONFIG_MK
	echo "#include \"compat/posix_spawn.h\"" >>$CONFIG_H
else
	echo "#include <spawn.h>" >>$CONFIG_H
fi

if [ -z "$SERVICECMD" ]; then
	printf "Checking for OpenRC ... "
	if [ -x /sbin/rc-service ]; then
		SERVICEEXISTS="/sbin/rc-service -e \$1"
		SERVICECMD="/sbin/rc-service \$1 -- -D \$2"
		echo "yes"
	else
		echo "no"
	fi
fi
if [ -z "$SERVICECMD" ]; then
	printf "Checking for invoke-rc.d ... "
	if [ -x /usr/sbin/invoke-rc.d ]; then
		SERVICEEXISTS="/usr/sbin/invoke-rc.d --query --quiet \$1 start >/dev/null 2>&1 || [ \$? = 104 ]"
		SERVICECMD="/usr/sbin/invoke-rc.d \$1 \$2"
		echo "yes"
	else
		echo "no"
	fi
fi
if [ -z "$SERVICECMD" ]; then
	printf "Checking for service ... "
	if [ -x /sbin/service ]; then
		SERVICEEXISTS="/sbin/service \$1 >/dev/null 2>&1"
		SERVICECMD="/sbin/service \$1 \$2"
		echo "yes"
	else
		echo "no"
	fi
fi
if [ -z "$SERVICECMD" ]; then
	for x in /etc/init.d/rc.d /etc/rc.d /etc/init.d; do
		printf "Checking for $x ... "
		if [ -d $x ]; then
			SERVICEEXISTS="[ -x $x/\$1 ]"
			SERVICECMD="$x/\$1 \$2"
			echo "yes"
			break
		else
			echo "no"
		fi
	done
fi
if [ -e /etc/arch-release ]; then
	echo "Overriding service status check for Arch Linux"
	SERVICESTATUS="[ -e /var/run/daemons/\$1 ]"
fi

if [ -z "$SERVICEEXISTS" -o -z "$SERVICECMD" ]; then
	echo "$0: WARNING: No means of interacting with system services detected!"
	SERVICEEXISTS="return 1"
	SERVICECMD="return 1"
fi
if [ -z "$SERVICESTATUS" ]; then
	SERVICESTATUS="service_command \$1 status >/dev/null 2>&1"
fi
# Transform for a make file
SERVICEEXISTS=$(echo "$SERVICEEXISTS" | $SED \
	-e 's:\\:\\\\:g' \
	-e 's:\&:\\\&:g' \
	-e 's:\$:\$\$:g' \
)
echo "SERVICEEXISTS=	$SERVICEEXISTS" >>config.mk
SERVICECMD=$(echo "$SERVICECMD" | $SED \
	-e 's:\\:\\\\:g' \
	-e 's:\&:\\\&:g' \
	-e 's:\$:\$\$:g' \
)
echo "SERVICECMD=	$SERVICECMD" >>config.mk
SERVICESTATUS=$(echo "$SERVICESTATUS" | $SED \
	-e 's:\\:\\\\:g' \
	-e 's:\&:\\\&:g' \
	-e 's:\$:\$\$:g' \
)
echo "SERVICESTATUS=	$SERVICESTATUS" >>config.mk

HOOKS=
if ! $HOOKSET; then
	printf "Checking for ntpd ... "
	NTPD=$(_which ntpd)
	if [ -n "$NTPD" ]; then
		echo "$NTPD (50-ntp.conf)"
		HOOKS="$HOOKS${HOOKS:+ }50-ntp.conf"
	else
		echo "not found"
	fi

	printf "Checking for ypind ... "
	YPBIND=$(_which ypbind)
	if [ -n "$YPBIND" ]; then
		if strings "$YPBIND" | grep -q yp.conf; then
			YPHOOK="50-yp.conf"
		else
			YPHOOK="50-ypbind"
		fi
		echo "$YPBIND ($YPHOOK)"
		HOOKS="$HOOKS${HOOKS:+ }$YPHOOK"
	else
		echo "not found"
	fi
fi

cd dhcpcd-hooks
for x in $HOOKSCRIPTS; do
	printf "Finding hook $x ... "
	for h in [0-9][0-9]"-$x" [0-9][0-9]"-$x.sh" [0-9][0-9]"-$x.conf"; do
		[ -e "$h" ] && break
	done
	if [ ! -e "$h" ]; then
		echo "no"
	else
		echo "$h"
		case " $HOOKS " in
		*" $h "*)	;;
		*)		HOOKS="$HOOKS${HOOKS:+ }$h";;
		esac
	fi
done
cd ..
echo "HOOKSCRIPTS=	$HOOKS" >>$CONFIG_MK

echo
echo "   SYSCONFDIR =		$SYSCONFDIR"
echo "   SBINDIR =		$SBINDIR"
echo "   LIBDIR =		$LIBDIR"
echo "   LIBEXECDIR =		$LIBEXECDIR"
echo "   DBDIR =		$DBDIR"
echo "   RUNDIR =		$RUNDIR"
echo "   MANDIR =		$MANDIR"
echo "   HOOKSCRIPTS =	$HOOKS"
echo