#include <unistd.h>

#include "buffer.h"
#include "dnsresolv.h"
#include "exit.h"
#include "ip.h"
#include "logmsg.h"
#include "str.h"
#include "stralloc.h"

#include "dns.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);
}