Created
July 18, 2017 16:59
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| #include <stdlib.h> | |
| #include <stdio.h> | |
| #include <netdb.h> | |
| #include <sys/socket.h> | |
| #include <arpa/inet.h> | |
| #include <netinet/in.h> | |
| int main(int argc, char* argv[]) | |
| { | |
| struct hostent *host_descriptor; | |
| char *address = argv[1]; | |
| host_descriptor = gethostbyname(address); | |
| if(host_descriptor == NULL) | |
| { | |
| perror("[ADR] host_descriptor is NULL\n"); | |
| return -1; | |
| } | |
| printf("[ADR] succesfully received information from %s\n", address); | |
| printf("[ADR] official name of the host is %s (%s)\n", host_descriptor->h_name, inet_ntoa(*(struct in_addr *)host_descriptor->h_addr)); | |
| for(int i = 0; host_descriptor->h_aliases[i] != NULL; i++) | |
| { | |
| printf(" + alternative hostname is %s (%s)\n", host_descriptor->h_aliases[i], inet_ntoa(* (struct in_addr *)host_descriptor->h_addr_list[i])); | |
| } | |
| return 0; | |
| } |
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