configure

#!/bin/sh
#
# sshdo - controls which commands may be executed via incoming ssh
# https://raf.org/sshdo
# https://github.com/raforg/sshdo
# https://codeberg.org/raforg/sshdo
#
# Copyright (C) 2018-2023 raf <raf@raf.org>
#
# This program 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 2 of the License, or
# (at your option) any later version.
#
# This program 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 this program; if not, see <https://www.gnu.org/licenses/>.
#
# 20230619 raf <raf@raf.org>

# Show the usage messge for --help

for opt in "$@"
do
	case "$opt" in
		--help|-h)
			echo "$0 [options]"
			echo "options:"
			echo "  --help, -h         - Output this help message, then exit"
			echo "  --verbose, -v      - Show resulting config diffs (Note: no option bundling)"
			echo "  --test, -n         - Don't modify anything (Note: no option bundling)"
			echo "  --destdir=/path    - Override DESTDIR in Makefile for building packages"
			echo "  --prefix=/path     - Override platform-specific installation prefix"
			echo "  --etcdir=/path     - Override platform-specific config directory"
			echo "  --mandir=/path     - Override platform-specific manpage directory"
			echo "  --macports         - Override default macOS config for macports"
			echo "  --macports-prefix=/path - Same as --macports with a non-default prefix"
			echo "  --enable-mangz     - Enable gzipped manpages (default on some systems)"
			echo "  --disable-mangz    - Disable gzipped manpages (default)"
			echo "  --with-python=name - Override default python interpreter (name or /path)"
			echo "  --default          - Restore Makefile to its defaults (for distribution)"
			echo ""
			eco "The --with-python= argument can be the name of a Python2 or Python3 interpreter"
			echo "to be found in the PATH (e.g., --with-python=python3.11), or it can be an"
			echo "absolute path to a specific interpreter (e.g., --with-python=/bin/python3)."
			echo "By default, \"python3\" or \"python\" in the PATH is used."
			echo ""
			exit 0
			;;
	esac
done

# Record --verbose and --test early (for editconf)

test=0
verbose=0
for opt in "$@"
do
	case "$opt" in
		--verbose|-v)
			verbose=1;
			;;
		--test|-n)
			test=1;
			;;
	esac
done

# Handle --default (for distribution)

default=0
for opt in "$@"
do
	case "$opt" in
		--default|default)
			default=1
			break
			;;
	esac
done

# Fatal error message (for editconf)

die() { echo "$0: $@" >&2; exit 1; }

# Modify a file (Makefile) with sed (honours --verbose and --test)

editconf()
{
	fname="$1"; shift
	if [ $verbose = 1 ]
	then
		sed "$@" < "$fname" > "$fname.tmp"; diff -u "$fname" "$fname.tmp"; rm "$fname.tmp"
	fi
	if [ $test = 0 ]
	then
		cp -p "$fname" "$fname.tmp" # Preserve file permissions
		sed "$@" < "$fname" > "$fname.tmp" && mv "$fname.tmp" "$fname" || die "failed to edit $fname"
	fi
}

# Operating system preferences (installation locations and manual compression)

case "`uname`" in
	Linux*) # prefix=/usr/local etcdir=/etc mandir=$prefix/share/man manzip=1
		echo "Configuring for linux"
		editconf Makefile \
			-e 's,^\(PREFIX = \).*$,\1/usr/local,' \
			-e 's,^\(BINDIR = \).*$,\1$(PREFIX)/bin,' \
			-e 's,^\(MANDIR = \).*$,\1$(PREFIX)/share/man,' \
			-e 's,^\(ETCDIR = \).*$,\1/etc,' \
			-e 's,^\(MAN_GZIP =\) 0,\1 1,'
		editconf sshdo \
			-e "s,default_config_fname = '.*',default_config_fname = '/etc/sshdoers'," \
			-e "s,default_logfiles = '.*',default_logfiles = '/var/log/auth.log*'," \
			-e "s,/[a-z/][a-z/]*/sshdo ,/usr/local/bin/sshdo ,"
		editconf sshdoers \
			-e 's,/[a-z/][a-z/]*/sshdoers,/etc/sshdoers,' \
			-e 's,"/[a-z/][a-z/]*/sshdo","/usr/local/bin/sshdo",' \
			-e 's, /[a-z/][a-z/]*/sshdo\.$, /usr/local/bin/sshdo.,' \
			-e 's,^# logfiles .*$,# logfiles /var/log/auth.log*,' \
			-e 's,^# banner .*$,# banner /etc/sshdo.banner,'
		editconf test_sshdo \
			-e "s,'/var/log/..*','/var/log/auth.log',"
		;;

	FreeBSD*) # prefix=/usr/local etcdir=$prefix/etc mandir=$prefix/man manzip=1
		echo "Configuring for freebsd"
		editconf Makefile \
			-e 's,^\(PREFIX = \).*$,\1/usr/local,' \
			-e 's,^\(BINDIR = \).*$,\1$(PREFIX)/bin,' \
			-e 's,^\(MANDIR = \).*$,\1$(PREFIX)/man,' \
			-e 's,^\(ETCDIR = \).*$,\1$(PREFIX)/etc,' \
			-e 's,^\(MAN_GZIP =\) 0,\1 1,'
		editconf sshdo \
			-e "s,default_config_fname = '.*',default_config_fname = '/usr/local/etc/sshdoers'," \
			-e "s,default_logfiles = '.*',default_logfiles = '/var/log/auth.log*'," \
			-e "s,/[a-z/][a-z/]*/sshdo ,/usr/local/bin/sshdo ,"
		editconf sshdoers \
			-e 's,/[a-z/][a-z/]*/sshdoers,/usr/local/etc/sshdoers,' \
			-e 's,"/[a-z/][a-z/]*/sshdo","/usr/local/bin/sshdo",' \
			-e 's, /[a-z/][a-z/]*/sshdo\.$, /usr/local/bin/sshdo.,' \
			-e 's,^# logfiles .*$,# logfiles /var/log/auth.log*,' \
			-e 's,^# banner .*$,# banner /usr/local/etc/sshdo.banner,'
		editconf test_sshdo \
			-e "s,'/var/log/..*','/var/log/auth.log',"
		;;

	NetBSD*) # prefix=/usr/pkg etcdir=$prefix/etc mandir=$prefix/man manzip=0
		echo "Configuring for netbsd"
		editconf Makefile \
			-e 's,^\(PREFIX = \).*$,\1/usr/pkg,' \
			-e 's,^\(BINDIR = \).*$,\1$(PREFIX)/bin,' \
			-e 's,^\(MANDIR = \).*$,\1$(PREFIX)/man,' \
			-e 's,^\(ETCDIR = \).*$,\1$(PREFIX)/etc,' \
			-e 's,^\(MAN_GZIP =\) 0,\1 0,'
		editconf sshdo \
			-e "s,default_config_fname = '.*',default_config_fname = '/usr/pkg/etc/sshdoers'," \
			-e "s,default_logfiles = '.*',default_logfiles = '/var/log/authlog*'," \
			-e "s,/[a-z/][a-z/]*/sshdo ,/usr/pkg/bin/sshdo ,"
		editconf sshdoers \
			-e 's,/[a-z/][a-z/]*/sshdoers,/usr/pkg/etc/sshdoers,' \
			-e 's,"/[a-z/][a-z/]*/sshdo","/usr/pkg/bin/sshdo",' \
			-e 's, /[a-z/][a-z/]*/sshdo\.$, /usr/pkg/bin/sshdo.,' \
			-e 's,^# logfiles .*$,# logfiles /var/log/authlog*,' \
			-e 's,^# banner .*$,# banner /usr/pkg/etc/sshdo.banner,'
		editconf test_sshdo \
			-e "s,'/var/log/..*','/var/log/authlog',"
		;;

	OpenBSD*) # prefix=/usr/local etcdir=$prefix/etc mandir=$prefix/man manzip=0
		echo "Configuring for openbsd"
		editconf Makefile \
			-e 's,^\(PREFIX = \).*$,\1/usr/local,' \
			-e 's,^\(BINDIR = \).*$,\1$(PREFIX)/bin,' \
			-e 's,^\(MANDIR = \).*$,\1$(PREFIX)/man,' \
			-e 's,^\(ETCDIR = \).*$,\1$(PREFIX)/etc,' \
			-e 's,^\(MAN_GZIP =\) 0,\1 0,'
		editconf sshdo \
			-e "s,default_config_fname = '.*',default_config_fname = '/usr/local/etc/sshdoers'," \
			-e "s,default_logfiles = '.*',default_logfiles = '/var/log/authlog*'," \
			-e "s,/[a-z/][a-z/]*/sshdo ,/usr/local/bin/sshdo ,"
		editconf sshdoers \
			-e 's,/[a-z/][a-z/]*/sshdoers,/usr/local/etc/sshdoers,' \
			-e 's,"/[a-z/][a-z/]*/sshdo","/usr/local/bin/sshdo",' \
			-e 's, /[a-z/][a-z/]*/sshdo\.$, /usr/local/bin/sshdo.,' \
			-e 's,^# logfiles .*$,# logfiles /var/log/authlog*,' \
			-e 's,^# banner .*$,# banner /usr/local/etc/sshdo.banner,'
		editconf test_sshdo \
			-e "s,'/var/log/..*','/var/log/authlog',"
		;;

	SunOS*) # prefix=/usr/local etcdir=/etc mandir=$prefix/share/man manzip=0
		echo "Configuring for solaris"
		editconf Makefile \
			-e 's,^\(PREFIX = \).*$,\1/usr/local,' \
			-e 's,^\(BINDIR = \).*$,\1$(PREFIX)/bin,' \
			-e 's,^\(MANDIR = \).*$,\1$(PREFIX)/share/man,' \
			-e 's,^\(ETCDIR = \).*$,\1/etc,' \
			-e 's,^\(MAN_GZIP =\) 0,\1 0,'
		editconf sshdo \
			-e "s,default_config_fname = '.*',default_config_fname = '/etc/sshdoers'," \
			-e "s,default_logfiles = '.*',default_logfiles = '/var/log/authlog*'," \
			-e "s,/[a-z/][a-z/]*/sshdo ,/usr/local/bin/sshdo ,"
		editconf sshdoers \
			-e 's,/[a-z/][a-z/]*/sshdoers,/etc/sshdoers,' \
			-e 's,"/[a-z/][a-z/]*/sshdo","/usr/local/bin/sshdo",' \
			-e 's, /[a-z/][a-z/]*/sshdo\.$, /usr/local/bin/sshdo.,' \
			-e 's,^# logfiles .*$,# logfiles /var/log/authlog*,' \
			-e 's,^# banner .*$,# banner /etc/sshdo.banner,'
		editconf test_sshdo \
			-e "s,'/var/log/..*','/var/log/authlog',"
		;;

	Darwin*) # prefix=/usr/local etcdir=/etc mandir=$prefix/share/man manzip=0
		echo "Configuring for macos"
		editconf Makefile \
			-e 's,^\(PREFIX = \).*$,\1/usr/local,' \
			-e 's,^\(BINDIR = \).*$,\1$(PREFIX)/bin,' \
			-e 's,^\(MANDIR = \).*$,\1$(PREFIX)/share/man,' \
			-e 's,^\(ETCDIR = \).*$,\1/etc,' \
			-e 's,^\(MAN_GZIP =\) 0,\1 0,'
		editconf sshdo \
			-e "s,default_config_fname = '.*',default_config_fname = '/etc/sshdoers'," \
			-e "s,default_logfiles = '.*',default_logfiles = '/var/log/system.log*'," \
			-e "s,/[a-z/][a-z/]*/sshdo ,/usr/local/bin/sshdo ,"
		editconf sshdoers \
			-e 's,/[a-z/][a-z/]*/sshdoers,/etc/sshdoers,' \
			-e 's,"/[a-z/][a-z/]*/sshdo","/usr/local/bin/sshdo",' \
			-e 's, /[a-z/][a-z/]*/sshdo\.$, /usr/local/bin/sshdo.,' \
			-e 's,^# logfiles .*$,# logfiles /var/log/system.log*,' \
			-e 's,^# banner .*$,# banner /etc/sshdo.banner,'
		editconf test_sshdo \
			-e "s,'/var/log/..*','/var/log/system.log',"
		;;

	CYGWIN_NT*) # prefix=/usr/local etcdir=/etc mandir=$prefix/share/man manzip=1
		echo "Configuring for cygwin"
		editconf Makefile \
			-e 's,^\(PREFIX = \).*$,\1/usr/local,' \
			-e 's,^\(BINDIR = \).*$,\1$(PREFIX)/bin,' \
			-e 's,^\(MANDIR = \).*$,\1$(PREFIX)/share/man,' \
			-e 's,^\(ETCDIR = \).*$,\1/etc,' \
			-e 's,^\(MAN_GZIP =\) 0,\1 1,'
		editconf sshdo \
			-e "s,default_config_fname = '.*',default_config_fname = '/etc/sshdoers'," \
			-e "s,default_logfiles = '.*',default_logfiles = '/var/log/auth.log*'," \
			-e "s,/[a-z/][a-z/]*/sshdo ,/usr/local/bin/sshdo ,"
		editconf sshdoers \
			-e 's,/[a-z/][a-z/]*/sshdoers,/etc/sshdoers,' \
			-e 's,"/[a-z/][a-z/]*/sshdo","/usr/local/bin/sshdo",' \
			-e 's, /[a-z/][a-z/]*/sshdo\.$, /usr/local/bin/sshdo.,' \
			-e 's,^# logfiles .*$,# logfiles /var/log/auth.log*,' \
			-e 's,^# banner .*$,# banner /etc/sshdo.banner,'
		editconf test_sshdo \
			-e "s,'/var/log/..*','/var/log/auth.log',"
		;;

	*)
		echo "Unknown platform: Check Makefile for binary/config/manpage installation locations"
		;;
esac

need_python_name=1
if [ $default = 1 ]
then
	echo "Configuring --default"
	editconf Makefile \
		-e 's,^\(PREFIX = \).*$,\1/usr,' \
		-e 's,^\(BINDIR = \).*$,\1$(PREFIX)/bin,' \
		-e 's,^\(MANDIR = \).*$,\1$(PREFIX)/share/man,' \
		-e 's,^\(ETCDIR = \).*$,\1/etc,' \
		-e 's,^\(MAN_GZIP =\) 1,\1 0,'
	editconf sshdo \
		-e "s,default_config_fname = '.*',default_config_fname = '/etc/sshdoers'," \
		-e "s,default_logfiles = '.*',default_logfiles = '/var/log/auth.log*'," \
		-e "s,/[a-z/][a-z/]*/sshdo ,/usr/bin/sshdo ,"
	editconf sshdoers \
		-e 's,/[a-z/][a-z/]*/sshdoers,/etc/sshdoers,' \
		-e 's,"/[a-z/][a-z/]*/sshdo","/usr/bin/sshdo",' \
		-e 's, /[a-z/][a-z/]*/sshdo\.$, /usr/bin/sshdo.,' \
		-e 's,^# logfiles .*$,# logfiles /var/log/auth.log*,' \
		-e 's,^# banner .*$,# banner /etc/sshdo.banner,'
	editconf test_sshdo \
		-e "s,'/var/log/..*','/var/log/auth.log',"
	editconf sshdo \
		-e 's|^#!/.*$|#!/usr/bin/env python3|'
	editconf test_sshdo \
		-e 's|^#!/.*$|#!/usr/bin/env python3|'
	need_python_name=0
fi

# Process command line options

for opt in "$@"
do
	case "$opt" in

		--verbose|-v)
			;;

		--test|-n)
			;;

		--default|default)
			;;

		--destdir=*)
			echo "Configuring $opt"
			destdir="${opt#--destdir=}"
			[ -n "$destdir" ] && destdir=" $destdir"
			editconf Makefile \
				-e 's|^\(DESTDIR =\).*$|\1'"$destdir"'|'
			;;

		--prefix=*)
			echo "Configuring $opt"
			prefix="${opt#--prefix=}"
			[ "$prefix" = "default" ] && prefix=/usr
			editconf Makefile \
				-e 's|^\(PREFIX =\).*$|\1 '"$prefix"'|'
			editconf sshdo \
				-e "s|/[a-z/][a-z/]*/sshdo |$prefix/bin/sshdo |"
			editconf sshdoers \
				-e 's|"/[a-z/][a-z/]*/sshdo"|"'"$prefix"'/bin/sshdo"|' \
				-e 's| /[a-z/][a-z/]*/sshdo\.$| '"$prefix"'/bin/sshdo.|'
			;;

		--etcdir=*)
			echo "Configuring $opt"
			etcdir="${opt#--etcdir=}"
			editconf Makefile \
				-e 's|^\(ETCDIR =\).*$|\1 '"$etcdir"'|'
			editconf sshdo \
				-e "s|default_config_fname = '.*'|default_config_fname = '$etcdir/sshdoers'|"
			editconf sshdoers \
				-e "s,/[a-z/][a-z/]*/sshdoers,$etcdir/sshdoers," \
				-e "s,^# banner .*$,# banner $etcdir/sshdo.banner,"
			;;

		--mandir=*)
			echo "Configuring $opt"
			mandir="${opt#--mandir=}"
			editconf Makefile \
				-e 's|^\(MANDIR =\).*$|\1 '"$mandir"'|'
			;;

		--macports|--macports-prefix=*) # default prefix=/opt/local etcdir=$prefix/etc mandir=$prefix/share/man manzip=1
			echo "Configuring $opt"
			if [ "x$opt" = x--macports ]
			then
				prefix="/opt/local"
			else
				prefix="${opt#--macports-prefix=}"
			fi
			editconf Makefile \
				-e 's|^\(PREFIX = \).*$|\1'"$prefix"'|' \
				-e 's,^\(BINDIR = \).*$,\1$(PREFIX)/bin,' \
				-e 's,^\(MANDIR = \).*$,\1$(PREFIX)/share/man,' \
				-e 's,^\(ETCDIR = \).*$,\1$(PREFIX)/etc,' \
				-e 's,^\(MAN_GZIP =\) 0,\1 1,'
			editconf sshdo \
				-e "s|default_config_fname = '.*'|default_config_fname = '$prefix/etc/sshdoers'|" \
				-e "s|default_logfiles = '.*'|default_logfiles = '/var/log/system.log*'|" \
				-e "s|/[a-z/][a-z/]*/sshdo |$prefix/bin/sshdo |"
			editconf sshdoers \
				-e 's|/[a-z/][a-z/]*/sshdoers|'"$prefix"'/etc/sshdoers|' \
				-e 's|"/[a-z/][a-z/]*/sshdo"|"'"$prefix"'/bin/sshdo"|' \
				-e 's| /[a-z/][a-z/]*/sshdo\.$| '"$prefix"'/bin/sshdo.|' \
				-e 's|^# logfiles .*$|# logfiles /var/log/system.log*|' \
				-e 's|^# banner .*$|# banner '"$prefix"'/etc/sshdo.banner|'
			editconf test_sshdo \
				-e "s,'/var/log/..*','/var/log/system.log',"
			;;

		--enable-mangz)
			echo "Configuring $opt"
			editconf Makefile \
				-e 's,^\(MAN_GZIP =\).*$,\1 1,'
			;;

		--disable-mangz)
			echo "Configuring $opt"
			editconf Makefile \
				-e 's,^\(MAN_GZIP =\).*$,\1 0,'
			;;

		--with-python=*)
			echo "Configuring $opt"
			python="${opt#--with-python=}"
			need_python_name=0
			case "$python" in
				/?*)
					editconf sshdo \
						-e 's|^#!/usr/bin/env .*$|#!'"$python"'|'
					editconf test_sshdo \
						-e 's|^#!/usr/bin/env .*$|#!'"$python"'|'
					;;
				*)
					editconf sshdo \
						-e 's|^#!/usr/bin/env .*$|#!/usr/bin/env '"$python"'|'
					editconf test_sshdo \
						-e 's|^#!/usr/bin/env .*$|#!/usr/bin/env '"$python"'|'
					;;
			esac
			;;

		*)
			echo "$0: Unknown argument: $opt" >&2
			exit 1
			;;

	esac
done

# Find out what Python is called here (if not already specified)

if [ $need_python_name = 1 ]
then
	for pyname in python3 python
	do
		[ -z "`command -v $pyname`" ] && continue
		editconf sshdo \
			-e 's|^#!/usr/bin/env .*$|#!/usr/bin/env '"$pyname"'|'
		editconf test_sshdo \
			-e 's|^#!/usr/bin/env .*$|#!/usr/bin/env '"$pyname"'|'
		exit 0
	done
	echo "$0: failed to find python3 or python in the PATH."
	echo "Please install python3 or try again with: --with-python=/path/to/python3"
	exit 1
fi

exit 0

# vi:set ts=4 sw=4: