| #include <arpa/inet.h> |
| #include <stdio.h> |
| |
| int main(int argc, char* argv[]) |
| { |
| if (argc < 1) |
| { |
| return 1; |
| } |
| if (argc != 2) |
| { |
| fprintf(stderr, "Usage: %s <ip address>\n", argv[0]); |
| return 1; |
| } |
| |
| union |
| { |
| struct in_addr in; |
| struct in6_addr in6; |
| } buf; |
| int af = AF_INET6; |
| if (inet_pton(af, argv[1], &buf) != 1) |
| { |
| af = AF_INET; |
| if (inet_pton(af, argv[1], &buf) != 1) |
| { |
| fprintf(stderr, "Invalid IP Address: %s\n", argv[1]); |
| return 2; |
| } |
| } |
| |
| char str[INET6_ADDRSTRLEN]; |
| if (inet_ntop(af, &buf, str, sizeof(str)) == NULL) |
| { |
| return 1; |
| } |
| |
| printf("%s\n", str); |
| return 0; |
| } |