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shorewall_code/Shorewall/functions
judas_iscariote 19a248d750 1. remove svn:executable property of some files. 
2. put the French docs in it's own branch.



git-svn-id: https://shorewall.svn.sourceforge.net/svnroot/shorewall/trunk@3609 fbd18981-670d-0410-9b5c-8dc0c1a9a2bb
2006-03-01 02:00:43 +00:00

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#!/bin/sh
#
# Shorewall 3.2 -- /usr/share/shorewall/functions
LIBVERSION=30105
#
# Message to stderr
#
error_message() # $* = Error Message
{
echo " $@" >&2
}
# Function to truncate a string -- It uses 'cut -b -<n>'
# rather than ${v:first:last} because light-weight shells like ash and
# dash do not support that form of expansion.
#
truncate() # $1 = length
{
cut -b -${1}
}
#
# Split a colon-separated list into a space-separated list
#
split() {
local ifs=$IFS
IFS=:
set -- $1
echo $*
IFS=$ifs
}
#
# Search a list looking for a match -- returns zero if a match found
# 1 otherwise
#
list_search() # $1 = element to search for , $2-$n = list
{
local e=$1
while [ $# -gt 1 ]; do
shift
[ "x$e" = "x$1" ] && return 0
done
return 1
}
#
# Return a space separated list of values matching
#
list_walk() # $1 = element to search for, $2-$n = list
{
local e=$1 result=
while [ $# -gt 1 ]; do
shift
case $1 in
$e*)
result="$result ${1##$e}"
;;
esac
done
echo $result
}
#
# Functions to count list elements
# - - - - - - - - - - - - - - - -
# Whitespace-separated list
#
list_count1() {
echo $#
}
#
# Comma-separated list
#
list_count() {
list_count1 $(separate_list $1)
}
#
# Conditionally produce message
#
progress_message() # $* = Message
{
local timestamp=
if [ $VERBOSE -gt 1 ]; then
[ -n "$TIMESTAMP" ] && timestamp="$(date +%H:%M:%S) "
echo "${timestamp}$@"
fi
}
progress_message2() # $* = Message
{
local timestamp=
if [ $VERBOSE -gt 0 ]; then
[ -n "$TIMESTAMP" ] && timestamp="$(date +%H:%M:%S) "
echo "${timestamp}$@"
fi
}
progress_message3() # $* = Message
{
local timestamp=
if [ $VERBOSE -ge 0 ]; then
[ -n "$TIMESTAMP" ] && timestamp="$(date +%H:%M:%S) "
echo "${timestamp}$@"
fi
}
#
# Suppress all output for a command
#
qt()
{
"$@" >/dev/null 2>&1
}
#
# Determine if Shorewall is "running"
#
shorewall_is_started() {
qt $IPTABLES -L shorewall -n
}
#
# Perform variable substitution on the passed argument and echo the result
#
expand() # $@ = contents of variable which may be the name of another variable
{
eval echo \"$@\"
}
#
# Perform variable substitition on the values of the passed list of variables
#
expandv() # $* = list of variable names
{
local varval
while [ $# -gt 0 ]; do
eval varval=\$${1}
eval $1=\"$varval\"
shift
done
}
#
# Add whitespace after "!"
#
fix_bang()
{
local result=
while [ $# -gt 0 ]; do
case $1 in
!*)
result="$result ! ${1#!}"
;;
*)
result="$result $1"
;;
esac
shift
done
echo $result
}
#
# Echos the fully-qualified name of the calling shell program
#
my_pathname() {
cd $(dirname $0)
echo $PWD/$(basename $0)
}
#
# Set default config path
#
ensure_config_path() {
local F=/usr/share/shorewall/configpath
if [ -z "$CONFIG_PATH" ]; then
[ -f $F ] || { echo " ERROR: $F does not exist"; exit 2; }
. $F
fi
}
#
# Find a File -- For relative file name, look first in $SHOREWALL_DIR then in /etc/shorewall
#
find_file()
{
local saveifs= directory
case $1 in
/*)
echo $1
;;
*)
if [ -n "$SHOREWALL_DIR" -a -f $SHOREWALL_DIR/$1 ]; then
echo $SHOREWALL_DIR/$1
else
saveifs=$IFS
IFS=:
for directory in $CONFIG_PATH; do
if [ -f $directory/$1 ]; then
echo $directory/$1
IFS=$saveifs
return
fi
done
IFS=$saveifs
echo /etc/shorewall/$1
fi
;;
esac
}
#
# Get fully-qualified name of file
#
resolve_file() # $1 = file name
{
local pwd=$PWD
case $1 in
/*)
echo $1
;;
./*)
echo ${pwd}${1#.}
;;
../*)
cd ..
echo ${PWD}${1#..}
cd $pwd
;;
*)
echo $pwd/$1
;;
esac
}
##
# Source a user exit file if it exists
#
run_user_exit() # $1 = file name
{
local user_exit=$(find_file $1)
if [ -f $user_exit ]; then
progress_message "Processing $user_exit ..."
. $user_exit
fi
}
#
# Replace commas with spaces and echo the result
#
separate_list() {
local list="$@"
local part
local newlist
local firstpart
local lastpart
local enclosure
case "$list" in
*,|,*|*,,*|*[[:space:]]*)
#
# There's been whining about us not catching embedded white space in
# comma-separated lists. This is an attempt to snag some of the cases.
#
# The 'TERMINATOR' function will be set by the 'firewall' script to
# either 'startup_error' or 'fatal_error' depending on the command and
# command phase
#
[ -n "$TERMINATOR" ] && \
$TERMINATOR "Invalid comma-separated list \"$@\""
echo "WARNING -- invalid comma-separated list \"$@\"" >&2
;;
*\[*\]*)
#
# Where we need to embed comma-separated lists within lists, we enclose them
# within square brackets
#
firstpart=${list%%\[*}
lastpart=${list#*\[}
enclosure=${lastpart%%\]*}
lastpart=${lastpart#*\]}
case $lastpart in
\,*)
case $firstpart in
*\,)
echo "$(separate_list ${firstpart%,}) [$enclosure] $(separate_list ${lastpart#,})"
;;
*)
echo "$(separate_list $firstpart)[$enclosure] $(separate_list ${lastpart#,})"
;;
esac
;;
*)
case $firstpart in
*\,)
echo "$(separate_list ${firstpart%,}) [$enclosure]$(separate_list $lastpart)"
;;
*)
echo "$(separate_list $firstpart)[$enclosure]$(separate_list $lastpart)"
;;
esac
;;
esac
return
;;
esac
list="$@"
part="${list%%,*}"
newlist="$part"
while [ "x$part" != "x$list" ]; do
list="${list#*,}";
part="${list%%,*}";
newlist="$newlist $part";
done
echo "$newlist"
}
#
# Load a Kernel Module
#
loadmodule() # $1 = module name, $2 - * arguments
{
local modulename=$1
local modulefile
local suffix
moduleloader=modprobe
if ! qt mywhich modprobe; then
moduleloader=insmod
fi
if [ -z "$(lsmod | grep $modulename)" ]; then
shift
for suffix in $MODULE_SUFFIX ; do
modulefile=$MODULESDIR/${modulename}.${suffix}
if [ -f $modulefile ]; then
case $moduleloader in
insmod)
insmod $modulefile $*
;;
*)
modprobe $modulename $*
;;
esac
return
fi
done
fi
}
#
# Reload the Modules
#
reload_kernel_modules() {
[ -z "$MODULESDIR" ] && MODULESDIR=/lib/modules/$(uname -r)/kernel/net/ipv4/netfilter
while read command; do
eval $command
done
}
#
# Load kernel modules required for Shorewall
#
load_kernel_modules()
{
save_modules_dir=$MODULESDIR
[ -z "$MODULESDIR" ] && \
MODULESDIR=/lib/modules/$(uname -r)/kernel/net/ipv4/netfilter
modules=$(find_file modules)
if [ -f $modules -a -d $MODULESDIR ]; then
progress_message "Loading Modules..."
. $modules
fi
MODULESDIR=$save_modules_dir
}
#
# Call this function to assert MUTEX with Shorewall. If you invoke the
# /sbin/shorewall program while holding MUTEX, you should pass "nolock" as
# the first argument. Example "shorewall nolock refresh"
#
# This function uses the lockfile utility from procmail if it exists.
# Otherwise, it uses a somewhat race-prone algorithm to attempt to simulate the
# behavior of lockfile.
#
mutex_on()
{
local try=0
local lockf=/var/lib/shorewall/lock
MUTEX_TIMEOUT=${MUTEX_TIMEOUT:-60}
if [ $MUTEX_TIMEOUT -gt 0 ]; then
[ -d /var/lib/shorewall ] || mkdir -p /var/lib/shorewall
if qt mywhich lockfile; then
lockfile -${MUTEX_TIMEOUT} -r1 ${lockf}
else
while [ -f ${lockf} -a ${try} -lt ${MUTEX_TIMEOUT} ] ; do
sleep 1
try=$((${try} + 1))
done
if [ ${try} -lt ${MUTEX_TIMEOUT} ] ; then
# Create the lockfile
echo $$ > ${lockf}
else
echo "Giving up on lock file ${lockf}" >&2
fi
fi
fi
}
#
# Call this function to release MUTEX
#
mutex_off()
{
rm -f /var/lib/shorewall/lock
}
#
# Determine which version of mktemp is present (if any) and set MKTEMP accortingly:
#
# None - No mktemp
# BSD - BSD mktemp (Mandrake)
# STD - mktemp.org mktemp
#
find_mktemp() {
local mktemp=`mywhich mktemp 2> /dev/null`
if [ -n "$mktemp" ]; then
if qt mktemp -V ; then
MKTEMP=STD
else
MKTEMP=BSD
fi
else
MKTEMP=None
fi
}
#
# create a temporary file. If a directory name is passed, the file will be created in
# that directory. Otherwise, it will be created in a temporary directory.
#
mktempfile() {
[ -z "$MKTEMP" ] && find_mktemp
if [ $# -gt 0 ]; then
case "$MKTEMP" in
BSD)
mktemp $1/shorewall.XXXXXX
;;
STD)
mktemp -p $1 shorewall.XXXXXX
;;
None)
> $1/shorewall-$$ && echo $1/shorewall-$$
;;
*)
echo " ERROR:Internal error in mktempfile" >&2
;;
esac
else
case "$MKTEMP" in
BSD)
mktemp /tmp/shorewall.XXXXXX
;;
STD)
mktemp -t shorewall.XXXXXX
;;
None)
rm -f /tmp/shorewall-$$
> /tmp/shorewall-$$ && echo /tmp/shorewall-$$
;;
*)
echo " ERROR:Internal error in mktempfile" >&2
;;
esac
fi
}
#
# create a temporary directory
#
mktempdir() {
[ -z "$MKTEMP" ] && find_mktemp
case "$MKTEMP" in
STD)
mktemp -td shorewall.XXXXXX
;;
None|BSD)
#
# Not all versions of the BSD mktemp support the -d option under Linux
#
mkdir /tmp/shorewall-$$ && chmod 700 /tmp/shorewall-$$ && echo /tmp/shorewall-$$
;;
*)
echo " ERROR:Internal error in mktempdir" >&2
;;
esac
}
#
# Read a file and handle "INCLUDE" directives
#
read_file() # $1 = file name, $2 = nest count
{
local first rest
if [ -f $1 ]; then
while read first rest; do
if [ "x$first" = "xINCLUDE" ]; then
if [ $2 -lt 4 ]; then
read_file $(find_file $(expand ${rest%#*})) $(($2 + 1))
else
echo " WARNING: INCLUDE in $1 ignored (nested too deeply)" >&2
fi
else
echo "$first $rest"
fi
done < $1
else
[ -n "$TERMINATOR" ] && $TERMINATOR "No such file: $1"
echo "WARNING -- No such file: $1"
fi
}
#
# Function for including one file into another
#
INCLUDE() {
. $(find_file $(expand $@))
}
#
# Strip comments and blank lines from a file and place the result in the
# temporary directory
#
strip_file() # $1 = Base Name of the file, $2 = Full Name of File (optional)
{
local fname
[ $# = 1 ] && fname=$(find_file $1) || fname=$2
if [ -f $fname ]; then
read_file $fname 0 | cut -d'#' -f1 | grep -v '^[[:space:]]*$' > $TMP_DIR/$1
else
> $TMP_DIR/$1
fi
}
#
# Note: The following set of IP address manipulation functions have anomalous
# behavior when the shell only supports 32-bit signed arithmatic and
# the IP address is 128.0.0.0 or 128.0.0.1.
#
#
# So that emacs doesn't get lost, we use $LEFTSHIFT rather than <<
#
LEFTSHIFT='<<'
#
# Convert an IP address in dot quad format to an integer
#
decodeaddr() {
local x
local temp=0
local ifs=$IFS
IFS=.
for x in $1; do
temp=$(( $(( $temp $LEFTSHIFT 8 )) | $x ))
done
echo $temp
IFS=$ifs
}
#
# convert an integer to dot quad format
#
encodeaddr() {
addr=$1
local x
local y=$(($addr & 255))
for x in 1 2 3 ; do
addr=$(($addr >> 8))
y=$(($addr & 255)).$y
done
echo $y
}
#
# Enumerate the members of an IP range -- When using a shell supporting only
# 32-bit signed arithmetic, the range cannot span 128.0.0.0.
#
# Comes in two flavors:
#
# ip_range() - produces a mimimal list of network/host addresses that spans
# the range.
#
# ip_range_explicit() - explicitly enumerates the range.
#
ip_range() {
local first last l x y z vlsm
case $1 in
!*)
#
# Let iptables complain if it's a range
#
echo $1
return
;;
[0-9]*.*.*.*-*.*.*.*)
;;
*)
echo $1
return
;;
esac
first=$(decodeaddr ${1%-*})
last=$(decodeaddr ${1#*-})
if [ $first -gt $last ]; then
fatal_error "Invalid IP address range: $1"
fi
l=$(( $last + 1 ))
while [ $first -le $last ]; do
vlsm=
x=31
y=2
z=1
while [ $(( $first % $y )) -eq 0 -a $(( $first + $y )) -le $l ]; do
vlsm=/$x
x=$(( $x - 1 ))
z=$y
y=$(( $y * 2 ))
done
echo $(encodeaddr $first)$vlsm
first=$(($first + $z))
done
}
ip_range_explicit() {
local first last
case $1 in
[0-9]*.*.*.*-*.*.*.*)
;;
*)
echo $1
return
;;
esac
first=$(decodeaddr ${1%-*})
last=$(decodeaddr ${1#*-})
if [ $first -gt $last ]; then
fatal_error "Invalid IP address range: $1"
fi
while [ $first -le $last ]; do
echo $(encodeaddr $first)
first=$(($first + 1))
done
}
#
# Netmask from CIDR
#
ip_netmask() {
local vlsm=${1#*/}
[ $vlsm -eq 0 ] && echo 0 || echo $(( -1 $LEFTSHIFT $(( 32 - $vlsm )) ))
}
#
# Network address from CIDR
#
ip_network() {
local decodedaddr=$(decodeaddr ${1%/*})
local netmask=$(ip_netmask $1)
echo $(encodeaddr $(($decodedaddr & $netmask)))
}
#
# The following hack is supplied to compensate for the fact that many of
# the popular light-weight Bourne shell derivatives don't support XOR ("^").
#
ip_broadcast() {
local x=$(( 32 - ${1#*/} ))
[ $x -eq 0 ] && echo -1 || echo $(( $(( 1 $LEFTSHIFT $x )) - 1 ))
}
#
# Calculate broadcast address from CIDR
#
broadcastaddress() {
local decodedaddr=$(decodeaddr ${1%/*})
local netmask=$(ip_netmask $1)
local broadcast=$(ip_broadcast $1)
echo $(encodeaddr $(( $(($decodedaddr & $netmask)) | $broadcast )))
}
#
# Test for network membership
#
in_network() # $1 = IP address, $2 = CIDR network
{
local netmask=$(ip_netmask $2)
test $(( $(decodeaddr $1) & $netmask)) -eq $(( $(decodeaddr ${2%/*}) & $netmask ))
}
#
# Netmask to VLSM
#
ip_vlsm() {
local mask=$(decodeaddr $1)
local vlsm=0
local x=$(( 128 $LEFTSHIFT 24 )) # 0x80000000
while [ $(( $x & $mask )) -ne 0 ]; do
[ $mask -eq $x ] && mask=0 || mask=$(( $mask $LEFTSHIFT 1 )) # Not all shells shift 0x80000000 left properly.
vlsm=$(($vlsm + 1))
done
if [ $(( $mask & 2147483647 )) -ne 0 ]; then # 2147483647 = 0x7fffffff
echo "Invalid net mask: $1" >&2
else
echo $vlsm
fi
}
#
# Chain name base for an interface -- replace all periods with underscores in the passed name.
# The result is echoed (less trailing "+").
#
chain_base() #$1 = interface
{
local c=${1%%+}
while true; do
case $c in
*.*)
c="${c%.*}_${c##*.}"
;;
*-*)
c="${c%-*}_${c##*-}"
;;
*%*)
c="${c%\%*}_${c##*%}"
;;
*)
echo ${c:=common}
return
;;
esac
done
}
#
# Loosly Match the name of an interface
#
if_match() # $1 = Name in interfaces file - may end in "+"
# $2 = Full interface name - may also end in "+"
{
local pattern=${1%+}
case $1 in
*+)
test "x$(echo $2 | truncate ${#pattern} )" = "x${pattern}"
;;
*)
test "x$1" = "x$2"
;;
esac
}
#
# Source IP range
#
source_ip_range() # $1 = Address or Address Range
{
case $1 in
*.*.*.*-*.*.*.*)
case $1 in
!*)
iprange_echo "! --src-range ${1#!}"
;;
*)
iprange_echo "--src-range $1"
;;
esac
;;
!+*)
echo "-m set ! $(get_set_flags ${1#!} src)"
;;
+*)
echo "-m set $(get_set_flags $1 src)"
;;
*)
echo "-s $1"
;;
esac
}
#
# Destination IP range
#
dest_ip_range() # $1 = Address or Address Range
{
case $1 in
*.*.*.*-*.*.*.*)
case $1 in
!*)
iprange_echo "! --dst-range ${1#!}"
;;
*)
iprange_echo "--dst-range $1"
;;
esac
;;
!+*)
echo "-m set ! $(get_set_flags ${1#!} dst)"
;;
+*)
echo "-m set $(get_set_flags $1 dst)"
;;
*)
echo "-d $1"
;;
esac
}
both_ip_ranges() # $1 = Source address or range, $2 = dest address or range
{
local rangeprefix= setprefix= rangematch= setmatch=
case $1 in
*.*.*.*-*.*.*.*)
rangeprefix="-m iprange"
rangematch="--src-range $1"
;;
!+*)
setprefix="-m set"
setmatch="! $(get_set_flags ${1#!} src)"
;;
+*)
setprefix="-m set"
setmatch="$(get_set_flags $1 src)"
;;
*)
rangematch="-s $1"
;;
esac
case $2 in
*.*.*.*-*.*.*.*)
rangeprefix="-m iprange"
rangematch="$rangematch --dst-range $2"
;;
!+*)
setprefix="-m set"
match="$setmatch ! $(get_set_flags ${2#!} dst)"
;;
+*)
setprefix="-m set"
setmatch="$setmatch $(get_set_flags $2 dst)"
;;
*)
rangematch="$rangematch -d $2"
;;
esac
echo "$rangeprefix $rangematch $setprefix $setmatch"
}
#
# Find the value 'dev' in the passed arguments then echo the next value
#
find_device() {
while [ $# -gt 1 ]; do
[ "x$1" = xdev ] && echo $2 && return
shift
done
}
#
# Find the value 'via' in the passed arguments then echo the next value
#
find_gateway() {
while [ $# -gt 1 ]; do
[ "x$1" = xvia ] && echo $2 && return
shift
done
}
#
# Find the value 'peer' in the passed arguments then echo the next value up to
# "/"
#
find_peer() {
while [ $# -gt 1 ]; do
[ "x$1" = xpeer ] && echo ${2%/*} && return
shift
done
}
#
# Find the interfaces that have a route to the passed address - the default
# route is not used.
#
find_rt_interface() {
ip route ls | while read addr rest; do
case $addr in
*/*)
in_network ${1%/*} $addr && echo $(find_device $rest)
;;
default)
;;
*)
if [ "$addr" = "$1" -o "$addr/32" = "$1" ]; then
echo $(find_device $rest)
fi
;;
esac
done
}
#
# Try to find the gateway through an interface looking for 'nexthop'
find_nexthop() # $1 = interface
{
echo $(find_gateway `ip route ls | grep "[[:space:]]nexthop.* $1"`)
}
#
# Find the default route's interface
#
find_default_interface() {
ip route ls | while read first rest; do
[ "$first" = default ] && echo $(find_device $rest) && return
done
}
#
# Echo the name of the interface(s) that will be used to send to the
# passed address
#
find_interface_by_address() {
local dev="$(find_rt_interface $1)"
local first rest
[ -z "$dev" ] && dev=$(find_default_interface)
[ -n "$dev" ] && echo $dev
}
#
# Find the interface with the passed MAC address
#
find_interface_by_mac() {
local mac=$1 first second rest dev
ip link ls | while read first second rest; do
case $first in
*:)
dev=$second
;;
*)
if [ "$second" = $mac ]; then
echo ${dev%:}
return
fi
esac
done
}
#
# Find interface address--returns the first IP address assigned to the passed
# device
#
find_first_interface_address() # $1 = interface
{
#
# get the line of output containing the first IP address
#
addr=$(ip -f inet addr show $1 2> /dev/null | grep 'inet .* global' | head -n1)
#
# If there wasn't one, bail out now
#
[ -n "$addr" ] || fatal_error "Can't determine the IP address of $1"
#
# Strip off the trailing VLSM mask (or the peer IP in case of a P-t-P link)
# along with everything else on the line
#
echo $addr | sed 's/inet //;s/\/.*//;s/ peer.*//'
}
#
# Find interface addresses--returns the set of addresses assigned to the passed
# device
#
find_interface_addresses() # $1 = interface
{
ip -f inet addr show $1 | grep inet\ | sed 's/inet //;s/\/.*//;s/ peer.*//'
}
#
# echo the list of networks routed out of a given interface
#
get_routed_networks() # $1 = interface name
{
local address
local rest
ip route show dev $1 2> /dev/null |
while read address rest; do
if [ "x$address" = xdefault ]; then
error_message "WARNING: default route ignored on interface $1"
else
[ "$address" = "${address%/*}" ] && address="${address}/32"
echo $address
fi
done
}
#
# Internal version of 'which'
#
mywhich() {
local dir
for dir in $(split $PATH); do
if [ -x $dir/$1 ]; then
echo $dir/$1
return 0
fi
done
return 2
}
#
# Set the Shorewall state
#
set_state () # $1 = state
{
echo "$1 ($(date))" > /var/lib/shorewall/state
}
#
# Determine which optional facilities are supported by iptables/netfilter
#
determine_capabilities() {
qt $IPTABLES -t nat -L -n && NAT_ENABLED=Yes || NAT_ENABLED=
qt $IPTABLES -t mangle -L -n && MANGLE_ENABLED=Yes || MANGLE_ENABLED=
CONNTRACK_MATCH=
MULTIPORT=
XMULTIPORT=
POLICY_MATCH=
PHYSDEV_MATCH=
IPRANGE_MATCH=
RECENT_MATCH=
OWNER_MATCH=
IPSET_MATCH=
CONNMARK=
CONNMARK_MATCH=
RAW_TABLE=
IPP2P_MATCH=
LENGTH_MATCH=
CLASSIFY_TARGET=
ENHANCED_REJECT=
USEPKTTYPE=
qt $IPTABLES -N fooX1234
qt $IPTABLES -A fooX1234 -m conntrack --ctorigdst 192.168.1.1 -j ACCEPT && CONNTRACK_MATCH=Yes
qt $IPTABLES -A fooX1234 -p tcp -m multiport --dports 21,22 -j ACCEPT && MULTIPORT=Yes
qt $IPTABLES -A fooX1234 -p tcp -m multiport --dports 21:22 -j ACCEPT && XMULTIPORT=Yes
qt $IPTABLES -A fooX1234 -m policy --pol ipsec --mode tunnel --dir in -j ACCEPT && POLICY_MATCH=Yes
qt $IPTABLES -A fooX1234 -m physdev --physdev-in eth0 -j ACCEPT && PHYSDEV_MATCH=Yes
qt $IPTABLES -A fooX1234 -m iprange --src-range 192.168.1.5-192.168.1.124 -j ACCEPT && IPRANGE_MATCH=Yes
qt $IPTABLES -A fooX1234 -m recent --update -j ACCEPT && RECENT_MATCH=Yes
qt $IPTABLES -A fooX1234 -m owner --uid-owner 0 -j ACCEPT && OWNER_MATCH=Yes
qt $IPTABLES -A fooX1234 -m connmark --mark 2 -j ACCEPT && CONNMARK_MATCH=Yes
qt $IPTABLES -A fooX1234 -p tcp -m ipp2p --ipp2p -j ACCEPT && IPP2P_MATCH=Yes
qt $IPTABLES -A fooX1234 -m length --length 10:20 -j ACCEPT && LENGTH_MATCH=Yes
qt $IPTABLES -A fooX1234 -j REJECT --reject-with icmp-host-prohibited && ENHANCED_REJECT=Yes
qt $IPTABLES -t mangle -N fooX1234
qt $IPTABLES -t mangle -A fooX1234 -j CONNMARK --save-mark && CONNMARK=Yes
qt $IPTABLES -t mangle -A fooX1234 -j CLASSIFY --set-class 1:1 && CLASSIFY_TARGET=Yes
qt $IPTABLES -t mangle -F fooX1234
qt $IPTABLES -t mangle -X fooX1234
qt $IPTABLES -t raw -L -n && RAW_TABLE=Yes
if qt mywhich ipset; then
qt ipset -X fooX1234 # Just in case something went wrong the last time
if qt ipset -N fooX1234 iphash ; then
if qt $IPTABLES -A fooX1234 -m set --set fooX1234 src -j ACCEPT; then
qt $IPTABLES -D fooX1234 -m set --set fooX1234 src -j ACCEPT
IPSET_MATCH=Yes
fi
qt ipset -X fooX1234
fi
fi
qt $IPTABLES -A fooX1234 -m pkttype --pkt-type broadcast -j ACCEPT && USEPKTTYPE=Yes
qt $IPTABLES -F fooX1234
qt $IPTABLES -X fooX1234
}
report_capability() # $1 = Capability Description , $2 Capability Setting (if any)
{
local setting=
[ "x$2" = "xYes" ] && setting="Available" || setting="Not available"
echo " " $1: $setting
}
report_capabilities() {
if [ $VERBOSE -gt 1 ]; then
echo "Shorewall has detected the following iptables/netfilter capabilities:"
report_capability "NAT" $NAT_ENABLED
report_capability "Packet Mangling" $MANGLE_ENABLED
report_capability "Multi-port Match" $MULTIPORT
[ -n "$MULTIPORT" ] && report_capability "Extended Multi-port Match" $XMULTIPORT
report_capability "Connection Tracking Match" $CONNTRACK_MATCH
report_capability "Packet Type Match" $USEPKTTYPE
report_capability "Policy Match" $POLICY_MATCH
report_capability "Physdev Match" $PHYSDEV_MATCH
report_capability "Packet length Match" $LENGTH_MATCH
report_capability "IP range Match" $IPRANGE_MATCH
report_capability "Recent Match" $RECENT_MATCH
report_capability "Owner Match" $OWNER_MATCH
report_capability "Ipset Match" $IPSET_MATCH
report_capability "CONNMARK Target" $CONNMARK
report_capability "Connmark Match" $CONNMARK_MATCH
report_capability "Raw Table" $RAW_TABLE
report_capability "IPP2P Match" $IPP2P_MATCH
report_capability "CLASSIFY Target" $CLASSIFY_TARGET
report_capability "Extended REJECT" $ENHANCED_REJECT
fi
[ -n "$PKTTYPE" ] || USEPKTTYPE=
}
# Add IP Aliases
#
add_ip_aliases() # $* = List of addresses
{
local addresses external interface inet cidr rest val arping=$(mywhich arping)
address_details()
{
#
# Folks feel uneasy if they don't see all of the same
# decoration on these IP addresses that they see when their
# distro's net config tool adds them. In an attempt to reduce
# the anxiety level, we have the following code which sets
# the VLSM and BRD from an existing address in the same networks
#
# Get all of the lines that contain inet addresses with broadcast
#
ip -f inet addr show $interface 2> /dev/null | grep 'inet.*brd' | while read inet cidr rest ; do
case $cidr in
*/*)
if in_network $external $cidr; then
echo "/${cidr#*/} brd $(broadcastaddress $cidr)"
break
fi
;;
esac
done
}
do_one()
{
val=$(address_details)
ip addr add ${external}${val} dev $interface $label
[ -n "$arping" ] && qt $arping -U -c 2 -I $interface $external
echo "$external $interface" >> $STATEDIR/nat
[ -n "$label" ] && label="with $label"
progress_message " IP Address $external added to interface $interface $label"
}
progress_message "Adding IP Addresses..."
while [ $# -gt 0 ]; do
external=$1
interface=$2
label=
if [ "$interface" != "${interface%:*}" ]; then
label="${interface#*:}"
interface="${interface%:*}"
label="label $interface:$label"
fi
shift 2
list_search $external $(find_interface_addresses $interface) || do_one
done
}
detect_gateway() # $1 = interface
{
local interface=$1
#
# First assume that this is some sort of point-to-point interface
#
gateway=$( find_peer $(ip addr ls $interface ) )
#
# Maybe there's a default route through this gateway already
#
[ -n "$gateway" ] || gateway=$(find_gateway $(ip route ls dev $interface))
#
# Last hope -- is there a load-balancing route through the interface?
#
[ -n "$gateway" ] || gateway=$(find_nexthop $interface)
#
# Be sure we found one
#
[ -n "$gateway" ] && echo $gateway
}
#
# Disable IPV6
#
disable_ipv6() {
local foo="$(ip -f inet6 addr ls 2> /dev/null)"
if [ -n "$foo" ]; then
if qt mywhich ip6tables; then
ip6tables -P FORWARD DROP
ip6tables -P INPUT DROP
ip6tables -P OUTPUT DROP
ip6tables -F
ip6tables -X
ip6tables -A OUTPUT -o lo -j ACCEPT
ip6tables -A INPUT -i lo -j ACCEPT
else
error_message "WARNING: DISABLE_IPV6=Yes in shorewall.conf but this system does not appear to have ip6tables"
fi
fi
}
#
# Add a logging rule.
#
log_rule_limit() # $1 = log level, $2 = chain, $3 = display Chain $4 = disposition , $5 = rate limit $6=log tag $7=command $... = predicates for the rule
{
local level=$1
local chain=$2
local displayChain=$3
local disposition=$4
local rulenum=
local limit="${5:-$LOGLIMIT}"
local tag=${6:+$6 }
local command=${7:--A}
local prefix
local base=$(chain_base $displayChain)
shift 7
if [ -n "$tag" -a -n "$LOGTAGONLY" ]; then
displayChain=$tag
tag=
fi
if [ -n "$LOGRULENUMBERS" ]; then
eval rulenum=\$${base}_logrules
rulenum=${rulenum:-1}
prefix="$(printf "$LOGFORMAT" $displayChain $rulenum $disposition)${tag}"
rulenum=$(($rulenum + 1))
eval ${base}_logrules=$rulenum
else
prefix="$(printf "$LOGFORMAT" $displayChain $disposition)${tag}"
fi
if [ ${#prefix} -gt 29 ]; then
prefix="$(echo $prefix | truncate 29)"
error_message "WARNING: Log Prefix shortened to \"$prefix\""
fi
case $level in
ULOG)
run_iptables $command $chain $@ $limit -j ULOG $LOGPARMS --ulog-prefix "$prefix"
;;
*)
run_iptables $command $chain $@ $limit -j LOG $LOGPARMS --log-level $level --log-prefix "$prefix"
;;
esac
if [ $? -ne 0 ] ; then
[ -z "$STOPPING" ] && { stop_firewall; exit 2; }
fi
}
log_rule() # $1 = log level, $2 = chain, $3 = disposition , $... = predicates for the rule
{
local level=$1
local chain=$2
local disposition=$3
shift 3
log_rule_limit $level $chain $chain $disposition "$LOGLIMIT" "" -A $@
}
delete_tc1()
{
clear_one_tc() {
tc qdisc del dev $1 root 2> /dev/null
tc qdisc del dev $1 ingress 2> /dev/null
}
run_user_exit tcclear
run_ip link list | \
while read inx interface details; do
case $inx in
[0-9]*)
clear_one_tc ${interface%:}
;;
*)
;;
esac
done
}
SHOREWALL_LIBRARY=Loaded
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