package/firewall/files/lib/fw.sh

   1 # Copyright (C) 2009-2010 OpenWrt.org
   2 # Copyright (C) 2009 Malte S. Stretz
   3
   4 export FW_4_ERROR=0
   5 export FW_6_ERROR=0
   6 export FW_i_ERROR=0
   7 export FW_e_ERROR=0
   8 export FW_a_ERROR=0
   9
  10 #TODO: remove this
  11 [ "${-#*x}" == "$-" ] && {
  12         fw() {
  13                 fw__exec "$@"
  14         }
  15 } || {
  16         fw() {
  17                 local os=$-
  18                 set +x
  19                 fw__exec "$@"
  20                 local rc=$?
  21                 set -$os
  22                 return $rc
  23         }
  24 }
  25
  26 fw__exec() { # <action> <family> <table> <chain> <target> <position> { <rules> }
  27         local cmd fam tab chn tgt pos
  28         local i
  29         for i in cmd fam tab chn tgt pos; do
  30                 if [ "$1" -a "$1" != '{' ]; then
  31                         eval "$i='$1'"
  32                         shift
  33                 else
  34                         eval "$i=-"
  35                 fi
  36         done
  37
  38         fw__rc() {
  39                 export FW_${fam}_ERROR=$1
  40                 return $1
  41         }
  42
  43         fw__dualip() {
  44                 fw $cmd 4 $tab $chn $tgt $pos "$@"
  45                 fw $cmd 6 $tab $chn $tgt $pos "$@"
  46                 fw__rc $((FW_4_ERROR | FW_6_ERROR))
  47         }
  48
  49         fw__autoip() {
  50                 local ip4 ip6
  51                 shift
  52                 while [ "$1" != '}' ]; do
  53                         case "$1" in
  54                                 *.*.*.*) ip4=1 ;;
  55                                 *:*) ip6=1 ;;
  56                         esac
  57                         shift
  58                 done
  59                 shift
  60                 if [ "${ip4:-4}" == "${ip6:-6}" ]; then
  61                         echo "fw: can't mix ip4 and ip6" >&2
  62                         return 1
  63                 fi
  64                 local ver=${ip4:+4}${ip6:+6}
  65                 fam=i
  66                 fw $cmd ${ver:-i} $tab $chn $tgt $pos "$@"
  67                 fw__rc $?
  68         }
  69
  70         fw__has() {
  71                 local tab=${1:-$tab}
  72                 if [ $tab == '-' ]; then
  73                         type $app > /dev/null 2> /dev/null
  74                         fw__rc $(($? & 1))
  75                         return
  76                 fi
  77                 local mod
  78                 eval "mod=\$FW_${fam}_${tab}"
  79                 if [ "$mod" ]; then
  80                         fw__rc $mod
  81                         return
  82                 fi
  83                 case "$fam" in
  84                         4) mod=iptable_${tab} ;;
  85                         6) mod=ip6table_${tab} ;;
  86                         *) mod=. ;;
  87                 esac
  88                 grep -q "^${mod} " /proc/modules
  89                 mod=$?
  90                 export FW_${fam}_${tab}=$mod
  91                 fw__rc $mod
  92         }
  93
  94         fw__err() {
  95                 local err
  96                 eval "err=\$FW_${fam}_ERROR"
  97                 fw__rc $err
  98         }
  99
 100         local app=
 101         local pol=
 102         case "$fam" in
 103                 4) [ $FW_DISABLE_IPV4 == 0 ] && app=iptables  || return ;;
 104                 6) [ $FW_DISABLE_IPV6 == 0 ] && app=ip6tables || return ;;
 105                 i) fw__dualip "$@"; return ;;
 106                 I) fw__autoip "$@"; return ;;
 107                 e) app=ebtables ;;
 108                 a) app=arptables ;;
 109                 -) fw $cmd i $tab $chn $tgt $pos "$@"; return ;;
 110                 *) return 254 ;;
 111         esac
 112         case "$tab" in
 113                 f) tab=filter ;;
 114                 m) tab=mangle ;;
 115                 n) tab=nat ;;
 116                 r) tab=raw ;;
 117                 -) tab=filter ;;
 118         esac
 119         case "$cmd:$chn:$tgt:$pos" in
 120                 add:*:-:*) cmd=new-chain ;;
 121                 add:*:*:-) cmd=append ;;
 122                 add:*:*:$) cmd=append ;;
 123                 add:*:*:*) cmd=insert ;;
 124                 del:-:*:*) cmd=delete-chain; fw flush $fam $tab ;;
 125                 del:*:-:*) cmd=delete-chain; fw flush $fam $tab $chn ;;
 126                 del:*:*:*) cmd=delete ;;
 127                 flush:*) ;;
 128                 policy:*) pol=$tgt; tgt=- ;;
 129                 has:*) fw__has; return ;;
 130                 err:*) fw__err; return ;;
 131                 list:*) cmd="numeric --verbose --$cmd" ;;
 132                 *) return 254 ;;
 133         esac
 134         case "$chn" in
 135                 -) chn= ;;
 136         esac
 137         case "$tgt" in
 138                 -) tgt= ;;
 139         esac
 140         case "$pos" in
 141                 ^) pos=1 ;;
 142                 $) pos= ;;
 143                 -) pos= ;;
 144         esac
 145
 146         if ! fw__has - family || ! fw__has $tab ; then
 147                 export FW_${fam}_ERROR=0
 148                 return 0
 149         fi
 150
 151         if [ $# -gt 0 ]; then
 152                 shift
 153                 if [ $cmd == delete ]; then
 154                         pos=
 155                 fi
 156         fi
 157         while [ $# -gt 1 ]; do
 158                 echo -n  "$1"
 159                 echo -ne "\0"
 160                 shift
 161         done | xargs -0 ${FW_TRACE:+-t} \
 162                 $app --table ${tab} --${cmd} ${chn} ${pol} ${pos} ${tgt:+--jump "$tgt"}
 163         fw__rc $?
 164 }
 165
 166 fw_get_port_range() {
 167         local ports=$1
 168         local delim=${2:-:}
 169         if [ "$3" ]; then
 170                 fw_get_port_range "${ports}-${3}" $delim
 171                 return
 172         fi
 173
 174         local first=${ports%-*}
 175         local last=${ports#*-}
 176         if [ "$first" != "$last" ]; then
 177                 echo "$first$delim$last"
 178         else
 179                 echo "$first"
 180         fi
 181 }
 182