DNS query packet for c

support DNS A record / MX record query

usage

for test (run shell): make run_dns
for api call: #include "util_dns.h"
then call method:
int dns_query(const char *host,char *data,int data_len,int dns_type)

Example , run in my bash

$ make run_dns

$ return below

id:46300,qr:1,opcode:0,aa:0,tc:1,rd:1,a:1,rcode:0
question_num:1,resource_record_num:1,pri_res_record_num:0,extend_record_num:0
question_type:1,question_class:1:
www.qq.com
res_record
record,class:1,type:1,size:4
180.96.86.192
pri_res_record
extend_res_record
dns_query ret 180.96.86.192