#!/bin/bash
# **** License ****
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.
#
# 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.
#
# This code was originally developed by Vyatta, Inc.
# Copyright (C) 2007-2010 Vyatta, Inc.
# All Rights Reserved.
#
# Description:	Vyatta Router system setup
#		Indirect init sub-script of vyatta-router.init
#
# **** End License ****

progname=${0##*/}
ACTION=$1

source /etc/default/vyatta

: ${vyatta_prefix:=/opt/vyatta}
: ${vyatta_bindir:=${vyatta_prefix}/bin}
: ${vyatta_sbindir:=${vyatta_prefix}/sbin}
: ${vyatta_sysconfdir:=${vyatta_prefix}/etc}

[[ $PATH == *${vyatta_bindir}* ]] || PATH+=:${vyatta_bindir}
[[ $PATH == *${vyatta_sbindir}* ]] || PATH+=:${vyatta_sbindir}

export PATH
export DEBIAN_FRONTEND=noninteractive

. /lib/lsb/init-functions

## BOOTFILE is provided by ofr.init
: ${BOOTFILE:=$prefix/etc/config/config.boot}

syslog ()
{
    logger -p user.warning -t "$progname" "$*"
}

# easy way to make empty file without any command
empty()
{
    >$1
}

shopt -s extglob nullglob

search_config_if_wan () {
    grep -q "\<serial\>.*\<$1\>" $BOOTFILE
}

add_new_serial_if () {
    __config_additions=/tmp/__config_additions
    rm -f $__config_additions

    ip link show |
        sed -n '/^[0-9]*: wan[0-9]*:/ s/.* \([^:]*\):.*$/\1/p' |
        while read wan ; do
	    if ! search_config_if_wan $wan ; then
	        echo "    serial $wan" >> $__config_additions
	    fi
        done

    if [ -e $__config_additions ]; then
	rm -f /tmp/__bootfile
	sed '/^[! ]*interfaces {$/ r '$__config_additions \
	    $BOOTFILE > /tmp/__bootfile
	mv /tmp/__bootfile $BOOTFILE
	rm -f $__config_additions
    fi
}

## Update the version information
update_version_info () {
    if [ -f ${vyatta_sysconfdir}/version.master ]; then
	cp -u ${vyatta_sysconfdir}/version.master ${vyatta_sysconfdir}/version
    fi
}

clear_or_override_config_files ()
{
    for conf in snmp/snmpd.conf snmp/snmptrapd.conf snmp/snmp.conf \
        keepalived/keepalived.conf \
        ipvsadm.rules default/ipvsadm resolv.conf
    do
	if [ -s /etc/$conf ] ; then
	    empty /etc/$conf
	    chmod 0644 /etc/$conf
	fi
    done
}

update_interface_config () {
    if [ -d /dev/.udev/vyatta ]; then
	$vyatta_sbindir/vyatta_interface_rescan /dev/.udev/vyatta $BOOTFILE
    fi
}

create_ssh_host_keys () {
    if [ ! -f "/etc/ssh/ssh_host_rsa_key" ]; then
        syslog "Creating ssh v2 rsa host key."
        ssh-keygen -q -N '' -t rsa -f /etc/ssh/ssh_host_rsa_key
    fi;
    if [ ! -f "/etc/ssh/ssh_host_dsa_key" ]; then
	syslog "Creating ssh v2 dsa host key."
        ssh-keygen -q -N '' -t dsa -f /etc/ssh/ssh_host_dsa_key
    fi;
    if [ ! -f "/etc/ssh/ssh_host_key" ]; then
	syslog "Creating ssh v1 host key."
        ssh-keygen -q -N '' -t rsa1 -f /etc/ssh/ssh_host_key
    fi;
}

set_ipv6_params ()
{
    rm -f /var/run/vyatta/ipv6_no_fwd.*

    # difficult to set new default values for IPV6 earlier
    if [ ! -d /proc/sys/net/ipv6 ]; then
	# Skip it if IPv6 is not loaded
	return
    fi

    # Enable forwarding
    echo 1 >/proc/sys/net/ipv6/conf/all/forwarding

    # Increase route table limit
    echo 32768 >/proc/sys/net/ipv6/route/max_size

    # These values all should be disabled
    for p in accept_source_route accept_redirects
    do
	for d in /proc/sys/net/ipv6/conf/*
	do
	    echo 0 > $d/$p
	done
    done
}

setup_ntp_config_file () {
    template_ntp_conf=/opt/vyatta/etc/ntp.conf
    if [ -e $template_ntp_conf ]; then
	cp -f $template_ntp_conf /etc/ntp.conf
    else
	log_failure_msg "NTP template config file doesn\'t exist"
    fi
}


# These are all the default security setting which are later
# overridden when configuration is read. These are the values the
# system defaults.
security_reset () {
   # restore PAM back to virgin state (no radius other services)
   rm -f /etc/pam_radius_auth.conf
   if grep -q radius /etc/pam.d/common-auth
   then
	pam-auth-update --package --remove radius
	rm /usr/share/pam-configs/radius
   fi

   # Disable root login over telnet
   sed -i -e '/^# Pseudo-terminal (telnet)/,$d' /etc/securetty

   # Restore default sshd config
   #  Disable root login with ssh
   #  Renable DNS validation
   #  Remove Listen addresses
   sed -i -e '/^PermitRootLogin/s/yes/no/' \
          -e '/^UseDNS/s/no/yes/' \
	  -e '/^ListenAddress/d' /etc/ssh/sshd_config
}

start () {
    mkdir -p /var/run/vyatta /var/log/vyatta
    chgrp vyattacfg /var/run/vyatta /var/log/vyatta
    chmod 775 /var/run/vyatta /var/log/vyatta

    update_interface_config
    create_ssh_host_keys || \
	log_failure_msg "can't initialize ssh host keys"
    clear_or_override_config_files || \
	log_failure_msg "can\'t reset config files"
    setup_ntp_config_file

    add_new_serial_if || \
	log_failure_msg "can\'t add serial interfaces"

    set_ipv6_params
    security_reset

    update_version_info

    # Clear out login banner changes
    for f in /etc/issue /etc/issue.net /etc/motd
    do
	if [ -f $f.old ]
	then mv $f.old $f
	fi
    done

    # Remove links from the commit hook directory
    rm -f /etc/commit/*

    ## Clear out apt config file--it will be filled in by config load
    empty /etc/apt/sources.list
}

case "$ACTION" in
    start) start ;;
    stop|restart|force-reload) true ;; # nothing to stop/restart
    *)	log_failure_msg "action unknown: $ACTION" ;
	false ;;
esac

exit $?