#include <unistd.h>
#include "buffer.h"
#include "stralloc.h"
#include "str.h"
#include "dnsresolv.h"
#include "dns.h"
#include "ip.h"
#include "exit.h"
#include "logmsg.h"

#define WHO "dnsptr"

stralloc out = {0};
char ip4[4];
char ip6[16];
 
int main(int argc,char **argv)
{
  if (!argv[1])
    logmsg(WHO,100,USAGE,"dnsptr ipv4 || ipv6 (compactified)");

  DNS_INIT
  if (str_chr(argv[1],':') < str_len(argv[1])) {
    if (!ip6_scan(argv[1],ip6))
      logmsg(WHO,111,FATAL,"wrong IPv6 format");
    if (dns_name6(&out,ip6) > 0)
      buffer_put(buffer_1,out.s,out.len);
  } else {
    if (!ip4_scan(argv[1],ip4))
      logmsg(WHO,111,FATAL,"wrong IPv4 format");
    if (dns_name4(&out,ip4) > 0)
      buffer_put(buffer_1,out.s,out.len);
  }
  buffer_putsflush(buffer_1,"\n");

  _exit(0);
}