contrib/package/freifunk-p2pblock/files/freifunk-p2pblock.init

   1 #!/bin/sh /etc/rc.common
   2
   3 START=82
   4 ME="freifunk-p2pblock"
   5 LOCK='/var/run/p2pblock.lock'
   6
   7 # helper-scripts
   8 ipt_add() {
   9         logger -t "$ME" "set 'iptables -I $1'"
  10         iptables -I $1
  11         echo "iptables -D $1" >> $LOCK
  12 }
  13
  14 start() {
  15         /etc/init.d/freifunk-p2pblock enabled || return
  16
  17         if [ ! -s "$LOCK" ]; then
  18                 logger -s -t "$ME" 'starting p2pblock...'
  19
  20                 config_load network
  21                 config_get wan wan ifname
  22
  23                 if [ -n "$wan" ]; then
  24                         config_load freifunk_p2pblock
  25                         config_get layer7 p2pblock layer7
  26                         config_get ipp2p p2pblock ipp2p
  27                         config_get portrange p2pblock portrange
  28                         config_get blocktime p2pblock blocktime
  29
  30                         # load modules
  31                         insmod ipt_ipp2p 2>&-
  32                         insmod ipt_layer7 2>&-
  33                         insmod ipt_recent ip_list_tot=400 ip_pkt_list_tot=3 2>&-
  34
  35                         # create new p2p-chain
  36                         iptables -N p2pblock
  37                         # pipe all incoming FORWARD with source-/destination-port 1024-65535 throu p2p-chain
  38                         ipt_add "FORWARD -i $wan -p tcp --sport $portrange --dport $portrange -j p2pblock"
  39                         ipt_add "FORWARD -i $wan -p udp --sport $portrange --dport $portrange -j p2pblock"
  40
  41                         # if p2p-traffic blocked 3 packages to a destination ip then block all traffic within the next 180 sec (port 1024-65535)
  42                         ipt_add "p2pblock -m recent --rdest --rcheck --name P2PBLOCK --seconds $blocktime --hitcount 3 -j DROP"
  43                         ipt_add "p2pblock -m recent --rdest --rcheck --name P2PBLOCK --seconds $blocktime --hitcount 3 -m limit --limit 1/minute -j LOG --log-prefix P2PBLOCK-DROP:"
  44
  45                         # create layer7-rules
  46                         for proto in $layer7; do
  47                                 ipt_add "p2pblock -m layer7 --l7proto $proto -m recent --rdest --set --name P2PBLOCK"
  48                                 ipt_add "p2pblock -m layer7 --l7proto $proto -m limit --limit 1/minute -j LOG --log-prefix P2PBLOCK-seen-$proto:"
  49                         done
  50
  51                         # create ipp2p-rules
  52                         for proto in $ipp2p; do
  53                                 ipt_add "p2pblock -m ipp2p --$proto -m recent --rdest --set --name P2PBLOCK"
  54                                 ipt_add "p2pblock -m ipp2p --$proto -m limit --limit 1/minute -j LOG --log-prefix P2PBLOCK-seen-$proto:"
  55                         done
  56
  57                         # insert whitelisted ips
  58                         for ip in $whitelist; do
  59                                 ipt_add "p2pblock -d $ip -j RETURN"
  60                         done
  61
  62                         logger -s -t "$ME" 'Done.'; return 0
  63                 else
  64                         logger -s -t "$ME" 'No wan interface present.'; return 0
  65                 fi
  66         else
  67                 logger -s -t "$ME" 'WARNING! already running - Aborting!'; return 2
  68         fi
  69 }
  70
  71 stop() {
  72         if [ -s "$LOCK" ]; then
  73                 logger -s -t "$ME" 'stopping p2pblock...'
  74
  75                 # unset all rules in $LOCK-file
  76                 cat $LOCK | sed -ne '1!G;h;$p' | while read line; do
  77                         logger -t "$ME" "unset $line"
  78                         while eval $line 2>&-; do :; done
  79                 done; : > "$LOCK"
  80
  81                 # flush and delete the p2p-chain
  82                 iptables -F p2pblock
  83                 iptables -X p2pblock
  84                 logger -s -t "$ME" 'Done.'; return 0
  85
  86         else
  87                 logger -s -t "$ME" 'WARNING! not running - Aborting!'; return 2
  88
  89         fi
  90 }
  91
  92 restart() {
  93         stop; sleep 1; start
  94 }