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

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