#include "byte.h"
#include "dnsresolv.h"
#include "fmt.h"
#include "ip.h"

/**
  @file dns_nd.c
  @autor djb, fefe
  @source 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;
}