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# Copyright (C) 2009-2010 OpenWrt.org
# Copyright (C) 2009 Malte S. Stretz
export FW_4_ERROR=0
export FW_6_ERROR=0
export FW_i_ERROR=0
export FW_e_ERROR=0
export FW_a_ERROR=0
#TODO: remove this
[ "${-#*x}" == "$-" ] && {
fw() {
fw__exec "$@"
}
} || {
fw() {
local os=$-
set +x
fw__exec "$@"
local rc=$?
set -$os
return $rc
}
}
fw__exec() { # <action> <family> <table> <chain> <target> <position> { <rules> }
local cmd fam tab chn tgt pos
local i
for i in cmd fam tab chn tgt pos; do
if [ "$1" -a "$1" != '{' ]; then
eval "$i='$1'"
shift
else
eval "$i=-"
fi
done
fw__rc() {
export FW_${fam}_ERROR=$1
return $1
}
fw__dualip() {
fw $cmd 4 $tab $chn $tgt $pos "$@"
fw $cmd 6 $tab $chn $tgt $pos "$@"
fw__rc $((FW_4_ERROR | FW_6_ERROR))
}
fw__autoip() {
local ip4 ip6
shift
while [ "$1" != '}' ]; do
case "$1" in
*.*.*.*) ip4=1 ;;
*:*) ip6=1 ;;
esac
shift
done
shift
if [ "${ip4:-4}" == "${ip6:-6}" ]; then
echo "fw: can't mix ip4 and ip6" >&2
return 1
fi
local ver=${ip4:+4}${ip6:+6}
fam=i
fw $cmd ${ver:-i} $tab $chn $tgt $pos "$@"
fw__rc $?
}
fw__has() {
local tab=${1:-$tab}
if [ $tab == '-' ]; then
type $app > /dev/null 2> /dev/null
fw__rc $(($? & 1))
return
fi
local mod
eval "mod=\$FW_${fam}_${tab}"
if [ "$mod" ]; then
fw__rc $mod
return
fi
case "$fam" in
4) mod=iptable_${tab} ;;
6) mod=ip6table_${tab} ;;
*) mod=. ;;
esac
grep "^${mod} " /proc/modules > /dev/null
mod=$?
export FW_${fam}_${tab}=$mod
fw__rc $mod
}
fw__err() {
local err
eval "err=\$FW_${fam}_ERROR"
fw__rc $err
}
local app=
local pol=
case "$fam" in
4) app=iptables ;;
6) app=ip6tables ;;
i) fw__dualip "$@"; return ;;
I) fw__autoip "$@"; return ;;
e) app=ebtables ;;
a) app=arptables ;;
-) fw $cmd i $tab $chn $tgt $pos "$@"; return ;;
*) return 254 ;;
esac
case "$tab" in
f) tab=filter ;;
m) tab=mangle ;;
n) tab=nat ;;
r) tab=raw ;;
-) tab=filter ;;
esac
case "$cmd:$chn:$tgt:$pos" in
add:*:-:*) cmd=new-chain ;;
add:*:*:-) cmd=append ;;
add:*:*:$) cmd=append ;;
add:*:*:*) cmd=insert ;;
del:-:*:*) cmd=delete-chain; fw flush $fam $tab ;;
del:*:-:*) cmd=delete-chain; fw flush $fam $tab $chn ;;
del:*:*:*) cmd=delete ;;
flush:*) ;;
policy:*) pol=$tgt; tgt=- ;;
has:*) fw__has; return ;;
err:*) fw__err; return ;;
list:*) cmd="numeric --verbose --$cmd" ;;
*) return 254 ;;
esac
case "$chn" in
-) chn= ;;
esac
case "$tgt" in
-) tgt= ;;
esac
case "$pos" in
^) pos=1 ;;
$) pos= ;;
-) pos= ;;
esac
if ! fw__has - family || ! fw__has $tab ; then
export FW_${fam}_ERROR=0
return 0
fi
if [ $# -gt 0 ]; then
shift
if [ $cmd == delete ]; then
pos=
fi
fi
while [ $# -gt 1 ]; do
echo -n "$1"
echo -ne "\0"
shift
done | xargs -0 ${FW_TRACE:+-t} \
$app --table ${tab} --${cmd} ${chn} ${pol} ${pos} ${tgt:+--jump "$tgt"}
fw__rc $?
}
fw_get_port_range() {
local ports=$1
local delim=${2:-:}
if [ "$3" ]; then
fw_get_port_range "${ports}-${3}" $delim
return
fi
local first=${ports%-*}
local last=${ports#*-}
if [ "$first" != "$last" ]; then
echo "$first$delim$last"
else
echo "$first"
fi
}
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