package/base-files/default/usr/lib/common.awk

   1 # Copyright (C) 2006 OpenWrt.org
   2
   3 function portstr(type, str) {
   4         gsub(/-/, ":", str)
   5         if (insmod_mport != 1) {
   6                 print "insmod ipt_multiport >&- 2>&-"
   7                 insmod_mport = 1
   8         }
   9         if (type == "src") return " -m multiport --sports " str
  10         else return " -m multiport --dports " str
  11 }
  12
  13 function str2ipt(str) {
  14         str2data(str)
  15         _cmd = ""
  16         if (_l["src"] != "") _cmd = _cmd " -s " _l["src"]
  17         if (_l["dest"] != "") _cmd = _cmd " -d " _l["dest"]
  18         if (_l["proto"] != "") {
  19                 _cmd = _cmd " -p " _l["proto"]
  20         }
  21         # scripts need to check for proto="" and emit two rules in that case
  22         if ((_l["proto"] == "") || (_l["proto"] == "tcp") || (_l["proto"] == "udp")) {
  23                 if (_l["sport"] != "") _cmd = _cmd portstr("src", _l["sport"])
  24                 if (_l["dport"] != "") _cmd = _cmd portstr("dest", _l["dport"])
  25         }
  26         if (_l["layer7"] != "") {
  27                 if (insmod_l7 != 1) {
  28                         print "insmod ipt_layer7 >&- 2>&-"
  29                         insmod_l7 = 1
  30                 }
  31                 _cmd = _cmd " -m layer7 --l7proto " _l["layer7"]
  32         }
  33         return _cmd
  34 }
  35
  36 function str2data(str) {
  37         delete _l
  38         _n = split(str, _o, "[\t ]")
  39         for (_i = 1; _i <= _n; _i++) {
  40                 _n2 = split(_o[_i], _c, "=")
  41                 if (_n2 == 2) _l[_c[1]] = _c[2]
  42         }
  43 }
  44
  45 function bitcount(c) {
  46         c=and(rshift(c, 1),0x55555555)+and(c,0x55555555)
  47         c=and(rshift(c, 2),0x33333333)+and(c,0x33333333)
  48         c=and(rshift(c, 4),0x0f0f0f0f)+and(c,0x0f0f0f0f)
  49         c=and(rshift(c, 8),0x00ff00ff)+and(c,0x00ff00ff)
  50         c=and(rshift(c,16),0x0000ffff)+and(c,0x0000ffff)
  51         return c
  52 }
  53
  54 function validate_netmask(nm) {
  55         return and(-nm,compl(nm))
  56 }
  57
  58 function ip2int(ip) {
  59         for (ret=0,n=split(ip,a,"\."),x=1;x<=n;x++) ret=or(lshift(ret,8),a[x])
  60         return ret
  61 }
  62
  63 function int2ip(ip,ret,x) {
  64         ret=and(ip,255)
  65         ip=rshift(ip,8)
  66         for(;x<3;ret=and(ip,255)"."ret,ip=rshift(ip,8),x++);
  67         return ret
  68 }