1 files changed, 66 insertions, 0 deletions
diff --git a/package/base-files/default/usr/lib/common.awk b/package/base-files/default/usr/lib/common.awk
new file mode 100644
index 000000000..63a8cf23d
--- /dev/null
+++ b/package/base-files/default/usr/lib/common.awk
@@ -0,0 +1,66 @@
+function portstr(type, str) {
+	gsub(/-/, ":", str)
+	if (insmod_mport != 1) {
+		print "insmod ipt_multiport >&- 2>&-"
+		insmod_mport = 1
+	}
+	if (type == "src") return " -m multiport --sports " str
+	else return " -m multiport --dports " str
+}
+
+function str2ipt(str) {
+	str2data(str)
+	_cmd = ""
+	if (_l["src"] != "") _cmd = _cmd " -s " _l["src"]
+	if (_l["dest"] != "") _cmd = _cmd " -d " _l["dest"]
+	if (_l["proto"] != "") {
+		_cmd = _cmd " -p " _l["proto"]
+	}
+	# scripts need to check for proto="" and emit two rules in that case
+	if ((_l["proto"] == "") || (_l["proto"] == "tcp") || (_l["proto"] == "udp")) {
+		if (_l["sport"] != "") _cmd = _cmd portstr("src", _l["sport"])
+		if (_l["dport"] != "") _cmd = _cmd portstr("dest", _l["dport"])
+	}
+	if (_l["layer7"] != "") {
+		if (insmod_l7 != 1) {
+			print "insmod ipt_layer7 >&- 2>&-"
+			insmod_l7 = 1
+		}
+		_cmd = _cmd " -m layer7 --l7proto " _l["layer7"]
+	}
+	return _cmd
+}
+
+function str2data(str) {
+	delete _l
+	_n = split(str, _o, "[\t ]")
+	for (_i = 1; _i <= _n; _i++) {
+		_n2 = split(_o[_i], _c, "=")
+		if (_n2 == 2) _l[_c[1]] = _c[2]
+	}
+}
+
+function bitcount(c) {
+	c=and(rshift(c, 1),0x55555555)+and(c,0x55555555)
+	c=and(rshift(c, 2),0x33333333)+and(c,0x33333333)
+	c=and(rshift(c, 4),0x0f0f0f0f)+and(c,0x0f0f0f0f)
+	c=and(rshift(c, 8),0x00ff00ff)+and(c,0x00ff00ff)
+	c=and(rshift(c,16),0x0000ffff)+and(c,0x0000ffff)
+	return c
+}
+
+function validate_netmask(nm) {
+	return and(-nm,compl(nm))
+}
+
+function ip2int(ip) {
+	for (ret=0,n=split(ip,a,"\."),x=1;x<=n;x++) ret=or(lshift(ret,8),a[x]) 
+	return ret
+}
+
+function int2ip(ip,ret,x) {
+	ret=and(ip,255)
+	ip=rshift(ip,8)
+	for(;x<3;ret=and(ip,255)"."ret,ip=rshift(ip,8),x++);
+	return ret
+}