1 files changed, 48 insertions, 0 deletions
diff --git a/src/dnsstub/dns_nd.c b/src/dnsstub/dns_nd.c
new file mode 100644
index 0000000..bdef42b
--- /dev/null
+++ b/src/dnsstub/dns_nd.c
@@ -0,0 +1,48 @@
+#include "byte.h"
+#include "fmt.h"
+#include "ip.h"
+#include "dnsresolv.h"
+
+/**
+	* @file dns_nd.c
+	* @authors djb, fefe
+	* @ref ucspi-tcp
+	* @brief DNS domain name for ip (wire format)
+  */
+
+int dns_name4_domain(char name[DNS_NAME4_DOMAIN],const char ip[4])
+{
+  unsigned int namelen;
+  unsigned int i;
+
+  namelen = 0;
+  i = fmt_ulong(name + namelen + 1,(unsigned long) (unsigned char) ip[3]);
+  name[namelen++] = i;
+  namelen += i;
+  i = fmt_ulong(name + namelen + 1,(unsigned long) (unsigned char) ip[2]);
+  name[namelen++] = i;
+  namelen += i;
+  i = fmt_ulong(name + namelen + 1,(unsigned long) (unsigned char) ip[1]);
+  name[namelen++] = i;
+  namelen += i;
+  i = fmt_ulong(name + namelen + 1,(unsigned long) (unsigned char) ip[0]);
+  name[namelen++] = i;
+  namelen += i;
+  byte_copy(name + namelen,14,"\7in-addr\4arpa\0");
+  return namelen+14;
+}
+
+int dns_name6_domain(char name[DNS_NAME6_DOMAIN],const char ip[16])
+{
+  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);
+  }
+  byte_copy(name + 4 * 16,10,"\3ip6\4arpa\0");
+  return 4 * 16 + 10;
+}
+