Removed submodules

p2-dns/src/utils.c

@@ -0,0 +1,53 @@
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "dns.h"
+#include "port_utils.h"
+#include "utils.h"
+
+// SUGGESTION: Use this file for any network-related functionality, such as
+// sending or receiving messages.
+
+void
+ptr_ip (char *dst, size_t dst_size, const char *ip)
+{
+  char tmp[64];
+  strncpy (tmp, ip, sizeof (tmp));
+  tmp[sizeof (tmp) - 1] = '\0';
+
+  char *octets[4];
+  char *token = strtok (tmp, ".");
+  int count = 0;
+  while (token && count < 4)
+    {
+      octets[count++] = token;
+      token = strtok (NULL, ".");
+    }
+
+  if (count != 4)
+    {
+      fprintf (stderr, "Invalid PTR IP");
+      exit (EXIT_FAILURE);
+    }
+
+  snprintf (dst, dst_size, "%s.%s.%s.%s.in-addr.arpa.", octets[3], octets[2],
+            octets[1], octets[0]);
+}
+
+void
+print_byte_block (uint8_t *bytes, size_t length)
+{
+  printf ("  ");
+  for (int i = 0; i < length; i++)
+    {
+      printf ("%02x", bytes[i]);
+      if (i == length - 1)
+        printf ("\n");
+      else if ((i + 1) % 16 == 0)
+        printf ("\n  ");
+      else if ((i % 2) != 0)
+        printf (" ");
+    }
+}