implemented asn1_get_known_oid(), mapping OID index to ASN1 OID

src/libstrongswan/asn1/asn1.c

@@ -217,6 +217,35 @@ int asn1_known_oid(chunk_t object)
 	return -1;
 }
 
+/*
+ * Defined in header.
+ */
+chunk_t asn1_get_known_oid(int n)
+{
+	chunk_t oid;
+	int i;
+	
+	if (n < 0 || n >= OID_MAX)
+	{
+		return chunk_empty;
+	}
+	
+	i = oid_names[n].level + 1;
+	oid = chunk_alloc(i);
+	do
+	{
+		if (oid_names[n].level >= i)
+		{
+			n--;
+			continue;
+		}
+		oid.ptr[--i] = oid_names[n--].octet;
+	}
+	while (i > 0);
+	
+	return oid;
+}
+
 /*
  * Defined in header.
  */

src/libstrongswan/asn1/asn1.h

@@ -106,6 +106,14 @@ chunk_t asn1_algorithmIdentifier(int oid);
  */
 int asn1_known_oid(chunk_t object);
 
+/**
+ * Converts an known OID index to ASN.1 OID
+ *
+ * @param n			index into the oid_names[] table
+ * @return			allocated OID chunk, chunk_empty if index out of range
+ */
+chunk_t asn1_get_known_oid(int n);
+
 /**
  * Returns the length of an ASN.1 object
  * The blob pointer is advanced past the tag length fields

src/libstrongswan/asn1/oid.pl

@@ -38,6 +38,7 @@ print OID_H "/* Object identifiers (OIDs) used by strongSwan\n",
 	    "    u_char octet;\n",
 	    "    u_int  next;\n",
 	    "    u_int  down;\n",
+	    "    u_int  level;\n",
 	    "    const u_char *name;\n",
 	    "} oid_t;\n",
 	    "\n",
@@ -77,6 +78,8 @@ while ($line = <SRC>)
     $counter++;
 }
 
+printf OID_H "\n#define OID_MAX%s%d\n", "\t" x 8, $counter;
+
 print OID_H "\n#endif /* OID_H_ */\n";
 
 close SRC;
@@ -113,12 +116,13 @@ for ($c = 0; $c < $counter; $c++)
 	}
     }
 
-    printf OID_C "  {%s%s,%s%3d, %d, %s%s}%s  /* %3d */\n"
+    printf OID_C " {%s%s,%s%3d, %d, %2d, %s%s}%s /* %3d */\n"
 	,' '  x @order[$c]
 	, @octet[$c]
 	, ' ' x (1 + $max_order - @order[$c])
 	, @next[$c]
 	, @order[$c+1] > @order[$c]
+	, @order[$c] / 2
 	, @name[$c]
 	, ' ' x ($max_name - length(@name[$c]))
 	, $c != $counter-1 ? "," : " "