DNS服务常用工具

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1 nslookup

备注：在winxp中还有此交互命令

例 1:

C:>c:/windows/system32/nslookup
Default Server: hangzhou.zjhzptt.net.cn
Address: 202.101.172.35

> sina
Server: hangzhou.zjhzptt.net.cn
Address: 202.101.172.35

DNS request timed out.
timeout was 2 seconds.
*** Request to hangzhou.zjhzptt.net.cn timed-out
> sina.com.cn
Server: hangzhou.zjhzptt.net.cn
Address: 202.101.172.35

Non-authoritative answer:
Name: sina.com.cn
Address: 202.108.33.32

> exit

2 host

注:linux/unix系可能会有

3 用gethostbyname 和 gethostbyaddr 编程实现

备注：作者的机器上用gethostbyaddr获得广域网的域名尚未成功过,以下代码仅供参考

  PHOSTENT phost;
  in_addr inAddr;
  phost = gethostbyname("sina.com.cn");
  inAddr.s_addr = ((struct in_addr far *)(phost->h_addr))->s_addr;
  printf("%s 's ip is %s/n", phost->h_name, inet_ntoa(inAddr));

char ip[20] = "192.168.1.121/0";

u_long res = inet_addr(ip);
  if(res == INADDR_NONE)
   printf("error!/n");
  phost = gethostbyaddr((char*)&res, sizeof(res), AF_INET);
  if(phost){
   printf("%s 's hostname is %s/n", ip, phost->h_name);
  }else
   printf("error!/n");