1 #include <stdio.h>
2 #include <stdlib.h>
3 #include <netdb.h>
4
5 /*
6 *用法:main www.baidu.com
7 */
8
9 int main(int argc, char* argv[])
10 {
11 char* name;
12 if(argc > 1) {
13 name = argv[1];
14 } else {
15 printf("get name from cmd error !\n");
16 return -1;
17 }
18 struct hostent* host = gethostbyname(name);
19 printf("official name is %s\n", host->h_name);
20 printf("h_length is %d\n", host->h_length);
21 char** addrListPtr = host->h_addr_list;
22 char* dst = malloc(256);
23 for(; *addrListPtr != NULL; addrListPtr++) {
24 if(host->h_addrtype == AF_INET || host->h_addrtype == AF_INET6) {
25 inet_ntop(host->h_addrtype, *addrListPtr, dst, 256);
26 if(dst != NULL) {
27 printf("ip is %s\n", dst);
28 }
29 }
30 }
31 return 0;
32 }
