1 files changed, 35 insertions, 0 deletions
diff --git a/dns_nd6.c b/dns_nd6.c
new file mode 100644
index 0000000..6dbeb89
--- /dev/null
+++ b/dns_nd6.c
@@ -0,0 +1,35 @@
+#include "byte.h"
+#include "fmt.h"
+#include "dns.h"
+
+/* RFC1886:
+ *   4321:0:1:2:3:4:567:89ab
+ * ->
+ *   b.a.9.8.7.6.5.0.4.0.0.0.3.0.0.0.2.0.0.0.1.0.0.0.0.0.0.0.1.2.3.4.IP6.INT.
+ *   b.a.9.8.7.6.5.0.4.0.0.0.3.0.0.0.2.0.0.0.1.0.0.0.0.0.0.0.1.2.3.4.IP6.ARPA.
+ */
+
+extern char tohex(char num);
+
+unsigned int mkint(unsigned char a,unsigned char b) {
+  return ((unsigned int)a << 8) + (unsigned int)b;
+}
+
+int dns_name6_domain(char name[DNS_NAME6_DOMAIN],const char ip[16],int t)
+{
+  unsigned int j;
+
+  for (j=0; j<16; j++) {
+    name[j*4]=1;
+    name[j*4+1]=tohex(ip[15-j] & 15);
+    name[j*4+2]=1;
+    name[j*4+3]=tohex((unsigned char)ip[15-j] >> 4);
+  }
+  if (t==DNS_IP6_INT)
+    byte_copy(name + 4*16,9,"\3ip6\3int\0");
+  else if (t==DNS_IP6_ARPA)
+    byte_copy(name + 4*16,10,"\3ip6\4arpa\0");
+  else return 0;
+  return 4*16+9+t;
+}
+