Date: 29 Mar 2001 07:08:54 +0200 From: Cyrille Lefevre <clefevre@poboxes.com> To: "Rodney W. Grimes" <freebsd@gndrsh.dnsmgr.net> Cc: mikel@ocsinternet.com (Mikel), johnny.dang@johnnydang.net (Johnny Dang), FREEBSD-IPFW@FreeBSD.ORG (FreeBSD IpFW) Subject: [LONG] Re: Scripting with IPFW Message-ID: <n1a517rt.fsf@gits.dyndns.org> In-Reply-To: <200103270821.AAA90749@gndrsh.dnsmgr.net> References: <200103270821.AAA90749@gndrsh.dnsmgr.net>
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[-- Attachment #1 --]
> oif=fxp0
> iif=rl0
> oip=`ifconfig ${oif} | awk '/inet/ {print $2; exit}'`
^ /inet /
I would suggest you to match on inet followed by a space or
you'll match inet6 which is probably you don't want.
# ifconfig -a | awk '/inet/{print $0;exit}'
inet6 fe80::260:8ff:fe1a:9a37%ep0 prefixlen 64 scopeid 0x1
# ifconfig -a | awk '/inet /{print $0;exit}'
inet 212.198.231.165 netmask 0xffffff00 broadcast 212.198.231.255
> omask=`ifconfig ${oif} | awk '/inet/ {print $4; exit}'`
> iip=`ifconfig ${iif} | awk '/inet/ {print $2; exit}'`
> imask=`ifconfig ${iif} | awk '/inet/ {print $4; exit}'`
also, these 4 lines may be rewritten as :
eval `ifconfig -a | awk -v oif="${oif}:" -v iif="${iif}:" '
$1 == oif { status = 1 ; next } # I/O interfaces
$1 == iif { status = 3 ; next } # use odd numbers here
$1 ~ /:/ { status = 0; next } # other interfaces
!status { next } # are skipped
/inet / { status++ } # match on first IPv4 address
status == 2 { # and use even numbers there
printf "omask=%s oip=%s\n", $4, $2
status = 0; next # skip IPv4 aliases
}
status == 4 {
printf "imask=%s iip=%s\n", $4, $2
status = 0; next
}
'`
which is what I use for months. (well, not exactly true since I have
only one interface for input/ouput due to an old BIOS and IRQ
conflicts which prevent me from having to network cards :)
> onet=`cidr -q ${oif} -h ${omask} | awk '/network/ {print $3}'`
^^^ should be oip. ^^ $NF is safer.
> inet=`cidr -q ${iif} -h ${imask} | awk '/network/ {print $3}'`
the following first two files are the dhclient's hooks I use for
months. the *dhclient-enter-hooks* was essentially used for debugging
purpose. recently, I added the multiple aliases hack which is not
handled by dhclient right now. it can handle only one alias by
interface. the *dhclient-exit-hooks* redo the aliases if needed,
restart the firewall, update the dynamic dns and my private dns. the
dhclient.conf is provided as a sample for multiple aliases. the
*start_if.ep0* is use at boot time to avoid restarting the firewall
which is just started before by the rc.network script. since I use
many private variables, I also supply the *rc.conf* file. FYI, I'm
using and maintaining the *isc-dhcp3* port for months, also, since the
dhclient-v2 is too buggy if you are using the /prepend/ tag in
*dhclient.conf.
hope this help and have fun :)
[-- Attachment #2 --]
#!/bin/sh
dhclient_conf=/usr/local/etc/dhclient.conf
dhclient_boot=/var/run/dhclient.boot
dhclient_log=/var/run/dhclient.$reason.log
dhclient_tmp=/var/run/dhclient.$$
dhclient_var=/var/run/dhclient.var
if [ -f $dhclient_boot ]; then
exec > $dhclient_log 2>&1 ; set -x
else
exec >> $dhclient_log 2>&1 ; set -x
fi
trap "rm -f ${dhclient_tmp}" 0
# initialization
LOGGER="logger -s -p local1.notice -t dhclient"
# logging
if [ "x$reason" != x ]; then
$LOGGER Reason for $interface: $reason
fi
if [ "x$medium" != x ]; then
$LOGGER Medium for $interface: $medium
fi
case ${reason} in
BOUND|RENEW|REBIND|REBOOT)
if [ -f $dhclient_boot ]; then
rm -f $dhclient_var
fi
if [ -f $dhclient_var ]; then
: . $dhclient_var
fi
cp /dev/null $dhclient_var
;;
esac
for new_var in \
new_host_name \
new_ip_address \
new_subnet_mask \
new_broadcast_address \
new_network_number \
new_routers \
new_static_routes \
new_domain_name \
new_domain_name_servers \
alias_ip_address \
alias_subnet_mask \
new_dhcp_server_identifier \
new_dhcp_message_type \
new_dhcp_lease_time \
new_dhcp_renewal_time \
new_dhcp_rebinding_time \
new_expiry
do
new_lab= spc=
for elem in `echo $new_var | sed "s/_/ /g"`; do
caps=`expr $elem : "\(.\).*" | tr a-z A-Z`
rest=`expr $elem : ".\(.*\)"`
new_lab="$new_lab$spc$caps$rest"
spc=" "
done
new_lab=`echo $new_lab | sed 's/Ip/IP/;s/Dhcp/DHCP/'`
eval new_val=\$$new_var
old_var=`echo $new_var | sed "s/new/old/"`
old_lab=`echo $new_lab | sed "s/New/Old/"`
eval old_val=\$$old_var
case $old_var in
old_domain_name*) old_val=`echo $old_val | \
sed -e :l -e 's/\(.*\) \1 \(.*\)/\1 \2/;t l'` ;;
esac
if [ "x$old_val" != x ] && [ "x$new_val" != "x$old_val" ]; then
$LOGGER "$old_lab: $old_val"
fi
if [ "x$new_val" != x ]; then
$LOGGER "$new_lab: $new_val"
fi
case ${reason} in
BOUND|RENEW|REBIND|REBOOT)
if echo $old_var | grep -q old
then
eval old_val=\$$new_var
echo $old_var=\${$old_var:-\"$old_val\"} export $old_var >> $dhclient_var
fi
;;
esac
done
case ${reason} in
PREINIT)
awk -v interface=$interface '
/[ ]*#[ ]*alias/ && $3 == interface { print $4 }
' $dhclient_conf |
while read alias_ip_address; do
ifconfig $interface inet -alias $alias_ip_address > /dev/null 2>&1
route delete $alias_ip_address 127.0.0.1 > /dev/null 2>&1
done
;;
BOUND|RENEW|REBIND|REBOOT|EXPIRE|FAIL|TIMEOUT)
awk -v interface=$interface '
/[ ]*#[ ]*alias/ && $3 == interface { print $4 }
' $dhclient_conf |
while read alias_ip_address; do
if [ x$old_ip_address != x ] && [ x$alias_ip_address != x ] && \
[ x$alias_ip_address != x$old_ip_address ]; then
ifconfig $interface inet -alias $alias_ip_address > /dev/null 2>&1
route delete $alias_ip_address 127.0.0.1 > /dev/null 2>&1
fi
done
;;
esac
# eof
[-- Attachment #3 --]
#!/bin/sh
# If there is a global system configuration file, suck it in.
#
if [ -r /etc/defaults/rc.conf ]; then
. /etc/defaults/rc.conf
source_rc_confs
elif [ -r /etc/rc.conf ]; then
. /etc/rc.conf
fi
# for var in \
# firewall_enable firewall_script firewall_type dhcp_bootfile \
# dyndns_enable dyndns_program dyndns_flags \
# dyndns_database dyndns_hostname dyndns_domainname \
# named_enable named_zone domainname \
# do;
# eval echo ${var}=\"\$${var}\"
# done
case ${reason} in
BOUND|RENEW|REBIND|REBOOT|EXPIRE|FAIL|TIMEOUT)
awk -v interface=$interface '
/[ ]*#[ ]*alias/ && $3 == interface { print $4, $5 }
' $dhclient_conf |
while read alias_ip_address alias_subnet_mask; do
alias_subnet_arg="netmask $alias_subnet_mask"
if [ x$new_ip_address != x$alias_ip_address ] && [ x$alias_ip_address != x ]; then
ifconfig $interface inet alias $alias_ip_address $alias_subnet_arg
route add $alias_ip_address 127.0.0.1
fi
done
;;
esac
case ${reason} in
BOUND|RENEW|REBIND|REBOOT|EXPIRE|TIMEOUT)
# reset the firewall rules, if any
case ${firewall_enable} in
[Yy][Ee][Ss])
if /sbin/ipfw -q flush > /dev/null 2>&1; then
firewall_in_kernel=1
else
firewall_in_kernel=0
fi
if [ ${firewall_in_kernel} -eq 1 ]; then
if [ -z "${firewall_script}" ]; then
firewall_script=/etc/rc.firewall
fi
if [ -f "${dhcp_bootfile}" ]; then
rm -f ${dhcp_bootfile}
firewall_type="OPEN"
fi
sh ${firewall_script} ${firewall_type}
fi
esac
;; esac # reason
case ${reason} in BOUND|REBIND|REBOOT|RENEW)
# echo domain ${domainname} >> /etc/resolv.conf
# record the new ip address, if needed
date2julian () # day month year
{
# Tapani Tarvainen July 1998, May 2000 - Julian Day Number from calendar date
day=$1 month=$2 year=$3
tmpmonth=$(( 12 * ${year} + ${month} - 3 ))
tmpyear=$(( ${tmpmonth} / 12 ))
echo $(( (734 * ${tmpmonth} + 15) / 24 - 2 * ${tmpyear} + \
${tmpyear}/4 - ${tmpyear}/100 + ${tmpyear}/400 + ${day} + 1721119 ))
}
days_lapsed () { # file
file=$1
cday=$(date +%d) cmonth=$(date +%m) cyear=$(date +%Y)
cdate="${cday} ${cmonth} ${cyear}"
fdate=$(ls -l ${file} | awk -v cmonth=$cmonth -v cyear=$cyear '
BEGIN {
month["Jan"]=1; month["Feb"]=2; month["Mar"]=3
month["Apr"]=4; month["May"]=5; month["Jun"]=6
month["Jul"]=7; month["Aug"]=8; month["Sep"]=9
month["Oct"]=10; month["Nov"]=11; month["Dec"]=12
}
{ print $7, month[$6], $8 ~ /:/ ? cyear - (month[$6] > cmonth) : $8 }')
echo $(( $(date2julian ${cdate} ) - $(date2julian ${fdate}) ))
}
case ${dyndns_enable} in
[Yy][Ee][Ss])
if [ -n "${new_ip_address}" ]; then
dyndns_fqdn=${dyndns_hostname}.${dyndns_domainname}
dyndns_file=${dyndns_database}/${dyndns_fqdn}
sedipre="[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}"
days_lapsed=0
if [ -f ${dyndns_file} ]; then
dyndns_ip_address=$(cat ${dyndns_file})
days_lapsed=$(days_lapsed ${dyndns_file})
fi
if [ "${dyndns_ip_address}" != "${new_ip_address}" ] ||
[ "${days_lapsed}" -ge ${dyndns_interval} ]; then
if [ "${dyndns_ip_address}" != "${new_ip_address}" ]; then
if [ -n "${dyndns_ip_address}" ]; then
$LOGGER "Old DynDNS IP Address: ${dyndns_ip_address}"
fi
$LOGGER New DynDNS IP Address: ${new_ip_address}
else
$LOGGER ReNew DynDNS IP Address: ${new_ip_address}
fi
if [ -x "${dyndns_program}" ]; then
cmd=${dyndns_program} args=
args="${args} --host ${dyndns_fqdn}"
args="${args} --ip ${new_ip_address}"
args="${args} ${dyndns_flags}"
succeeded="Update of ${dyndns_fqdn} succeeded"
notchanged="Host ${dyndns_fqdn} not changed"
re="${succeeded}|${notchanged}" email=root
${cmd} ${args} > ${dhclient_tmp} 2>&1; rc=$?
if egrep -q "${re}" ${dhclient_tmp}; then
echo ${new_ip_address} > ${dyndns_file}
else
cat - ${dhclient_tmp} <<- EOF |
${cmd} ${args}
echo ${new_ip_address} > ${dyndns_file}
echo
EOF
mail -s "dyndns@${hostname} (rc=$rc)" ${email}
fi
fi
case ${named_enable} in
[Yy][Ee][Ss])
named_file=${named_database}/${domainname}
if [ -f ${named_file} ]; then
ed - ${named_file} <<- EOF &&
g/; ${dyndns_fqdn}/s/${ipre}/${new_ip_address}/
w
q
EOF
killall -1 named 2>/dev/null
fi
esac
fi
fi
esac
ifconfig -a > /var/run/ifconfig.log
netstat -rna > /var/run/netstat.log
;; esac # reason
# eof
[-- Attachment #4 --]
# $FreeBSD: src/etc/dhclient.conf,v 1.2 1999/08/27 23:23:41 peter Exp $
#
# This file is required by the ISC DHCP client.
# See ``man 5 dhclient.conf'' for details.
#
# In most cases an empty file is suffient for most people as the
# defaults are usually fine.
#
timeout 60;
retry 60;
select-timeout 5;
reboot 10;
initial-interval 5;
interface "ep0" {
request subnet-mask, broadcast-address, time-offset, routers,
domain-name, domain-name-servers, host-name;
require subnet-mask, domain-name-servers;
prepend domain-name "gits.fr.invalid "; # the final space is required
prepend domain-name-servers 127.0.0.1;
# media "link2";
}
alias {
interface "ep0";
fixed-address 192.168.144.96;
option subnet-mask 255.255.255.0;
# alias ep0 192.168.144.97 255.255.255.0
}
[-- Attachment #5 --]
#!/bin/sh
# If there is a global system configuration file, suck it in.
#
if [ -r /etc/defaults/rc.conf ]; then
. /etc/defaults/rc.conf
source_rc_confs
elif [ -r /etc/rc.conf ]; then
. /etc/rc.conf
fi
if [ "x$dhcp_bootfile" != x ]; then
touch $dhcp_bootfile
fi
[-- Attachment #6 --]
#!/bin/sh
#
# This file now contains just the overrides from /etc/defaults/rc.conf
# please make all changes to this file.
# -- sysinstall generated deltas -- #
##############################################################
### Important initial Boot-time options #####################
##############################################################
#
# apm
#
apm_enable="YES"
hlt_enable="YES" #add-on#
apmd_enable="YES"
##############################################################
### Network configuration sub-section ######################
##############################################################
### Basic network options: ###
#
# hostname & domainnames
#
hostname="gits"
domainname="gits.fr.invalid" #add-on#
# nisdomainname="gits.fr.invalid"
ip_address="192.168.144.96" #add-on#
ip_netmask="255.255.255.0" #add-on#
ip_bitmask="24" #add-on#
#
# dhcp
#
dhcp_program="/usr/local/sbin/dhclient"
dhcp_flags="-1 -q" # -D
dhcp_bootfile="/var/run/dhclient.boot" #add-on#
#
# bridge
#
# bridge_enable="YES" #add-on#
# bridge_cfg="ep0:1,ep1:1" #add-on#
# bridge_ipfw="YES" #add-on#
#
# firewall
#
firewall_enable="YES"
firewall_quiet="YES"
firewall_type="CUSTOM_STATIC"
firewall_interface="ep0" #add-on#
firewall_logging="YES"
#
# ipfilter_enable="YES"
# ipfilter_program="/sbin/ipf -Fa -f"
# ipfilter_flags="=E"
# ipfilter_rules="/etc/ipf.rules"
#
# ipmon_enable="YES"
# ipmon_flags="-Dsn"
#
# natd
#
natd_enable="YES"
natd_interface="ep0"
natd_conf="/etc/natd.conf" #add-on#
natd_flags="-f $natd_conf"
#
# ipnat_enable="YES"
# ipnat_program="/sbin/ipnat -CF -f"
# ipnat_rules="/etc/ipnat.rules"
#
# routing options
#
tcp_extensions="YES"
log_in_vain="YES"
tcp_drop_synfin="YES"
tcp_restrict_rst="YES"
icmp_drop_redirect="YES"
icmp_log_redirect="YES"
ip_stealth="YES" #add-on#
tcp_blackhole="YES" #add-on#
udp_blackhole="YES" #add-on#
#
# network interfaces
#
network_interfaces="lo0 ep0" # auto
ifconfig_ep0="DHCP"
# ifconfig_ep0="inet $hostname netmask $ip_netmask"
#
# ppp
#
# ppp_enable="YES"
# ppp_profile="freesurf"
# ppp_nat="YES"
### Network daemon (miscellaneous) & NFS options: ###
#
# syslogd
#
syslogd_flags="-a $ip_address/$ip_bitmask -vv" # -a *$domainname
#
# inetd
#
inetd_flags="-wW -l"
#
# named
#
named_enable="YES"
named_flags="-u bind -g bind"
named_database="/etc/namedb/zone" #add-on#
#
# automounter
#
# amd_enable="YES"
# amd_flags="-F /etc/amd.conf"
#
# rarpd
#
# rarpd_enable="YES" #add-on#
rarpd_interface="-a" #add-on#
rarpd_flags="-v -s $rarpd_interface" #add-on#
#
# bootparamd
#
# bootparamd_enable="YES" #add-on#
bootparamd_flags="-s" #add-on#
#
# nfs
#
# nfs_client_enable="YES"
# nfs_server_enable="YES"
nfs_interface="-a" #add-on# -h $hostname
nfs_server_flags="-u -t -n 4 $nfs_interface"
# nfs_reserved_port_only="YES"
#
# mountd
#
mountd_flags="-l -r -2"
#
# portmap (used by: rstatd rusersd walld pcnfsd rquotad sprayd)
#
portmap_enable="NO"
portmap_flags="-v"
#
# sshd
#
sshd_enable="YES"
sshd_flags="-4"
### Network Time Services options: ###
#
# ntpdate
#
ntpdate_enable="YES"
ntpdate_flags="-bs ntp.obspm.fr ntp.univ-lyon1.fr canon.inria.fr ntp-sop.inria.fr"
#
# xntpd
#
xntpd_enable="YES"
# Network Information Services (NIS) options: ###
# nis_client_enable="YES"
# nis_server_enable="YES"
# nis_server_flags="-n"
# nis_yppasswdd_enable="YES"
# nis_yppasswdd_flags="-f"
### Network routing options: ###
#
# ip forwarding
#
gateway_enable="YES"
#
# routed
#
router_enable="YES"
router_flags="-s" # ou -q
##############################################################
### System console options #################################
##############################################################
#
# keyboard
#
# keymap="fr.iso.acc"
keymap="us.iso.acc"
keyrate="fast"
#
# cursor
#
cursor="destructive"
#
# fonts
#
# scrnmap="iso-8859-1_to_cp437"
font8x16="iso-8x16"
font8x14="iso-8x14"
font8x8="iso-8x8"
#
# blanktime
#
blanktime="600"
#
# screen saver
#
saver="green"
# saver="matrix"
#
# moused
#
moused_enable="YES"
moused_port="/dev/psm0"
#
# all screens options
#
# allscreens_flags="-m on" # 80x50
#
# mixer
#
mixer="vol 100:100 pcm 25:25 speaker 50:50 line 0:0" #add-on#
##############################################################
### Miscellaneous administrative options ###################
##############################################################
#
# savecore
#
dumpdev="/dev/da0s1b"
#
# quotas
#
# check_quotas="YES"
# enable_quotas="YES"
#
# accounting
#
accounting_enable="YES"
#
# compatibility options
#
# ibcs2_enable="YES"
linux_enable="YES"
# svr4_enable="YES"
#
# cleaning
#
# clear_tmp_enable="YES"
#
# vi.recover
#
vi_recover="/var/preserve" #add-on#
#
# ldconfig paths
#
ldconfig_extra_paths=
ldconfig_extra_paths="$ldconfig_extra_paths /usr/local/pilot/lib"
ast_arch=$(uname -msr | awk '{sub("-.*","",$2);print tolower($3"--"$1$2)}')
ldconfig_extra_paths="$ldconfig_extra_paths /usr/local/arch/$ast_arch/lib"
for ldconfig_path in $ldconfig_extra_paths; do
case " $ldconfig_paths " in
*" $ldconfig_path "*) ;;
*) ldconfig_paths="$ldconfig_paths $ldconfig_path" ;;
esac
done
ldconfig_extra_paths_aout=
# ldconfig_extra_paths_aout="$ldconfig_extra_paths_aout /usr/X11R6-4.0/lib/aout"
for ldconfig_path_aout in $ldconfig_extra_paths_aout; do
case " $ldconfig_paths_aout " in
*" $ldconfig_path_aout "*) ;;
*) ldconfig_paths_aout="$ldconfig_paths_aout $ldconfig_path_aout" ;;
esac
done
#
# security options
#
# kern_securelevel_enable="YES"
# kern_securelevel="0" # implies 1 in multi-user level
#
# kernel options
#
kern_corefile=core #add-on#
#
# dyndns
#
dyndns_program="/usr/local/sbin/ddup" #add-on#
dyndns_enable="YES" #add-on#
dyndns_flags="--wildcard" #add-on#
dyndns_hostname="$hostname" #add-on#
dyndns_domainname="dyndns.org" #add-on#
dyndns_database="/var/db" #add-on#
dyndns_interval="25" #add-on#
#
# upsd
#
upsd_program="/usr/local/sbin/bkpupsd" #add-on#
upsd_enable="YES" #add-on#
upsd_flags="/dev/cuaa1" #add-on#
#
# rc log/debug
#
rc_log_enable="YES"
rc_debug_enable="NO"
# -- sysinstall generated deltas -- #
noWarn="YES"
[-- Attachment #7 --]
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