https://blog.csdn.net/Silvester123/article/details/80906413
https://github.com/ytlm/example-code/blob/444a295d2d64eb094e474a6b1428ccb335c85c13/c/simpleCode/dns.c
https://blog.csdn.net/Silvester123/article/details/80906413
https://github.com/ytlm/example-code/blob/444a295d2d64eb094e474a6b1428ccb335c85c13/c/simpleCode/dns.c