getaddrinfo program

gethost.c (text/plain), 1.07 KB, created by Sylvain BERTRAND on 2008-03-26 09:24:01 UTC

#include <stdio.h>
#include <stdlib.h>
#include <netdb.h>
#include <netinet/in.h>
#include <sys/socket.h>

int main(void)
{
	struct addrinfo *result=NULL;
	int error;

	if(0!=(error=getaddrinfo("localhost",NULL,NULL,&result)))
		fprintf(stderr,"error using getaddrinfo: %s\n",gai_strerror(error));

	if(result){
		struct addrinfo *cur_addr=result;
		do{
			if(cur_addr->ai_family==AF_INET6){
				if(cur_addr->ai_addr){
					struct sockaddr_in6 *in6=(struct sockaddr_in6 *)cur_addr->ai_addr;
					fprintf(stdout,"IPV6=");
					for(int i=0;i<(8-1);i++) fprintf(stdout,"%04x:",(in6->sin6_addr).s6_addr16[i]);
					fprintf(stdout,"%04x\n",(in6->sin6_addr).s6_addr16[7]);
				}
			}else if(cur_addr->ai_family==AF_INET){
				if(cur_addr->ai_addr){
					struct sockaddr_in *in4=(struct sockaddr_in *)cur_addr->ai_addr;
					fprintf(stdout,"IPV4=%lx\n",in4->sin_addr);
				}else fprintf(stdout,"IPV4 null\n");
			}else fprintf(stdout,"Unknown type\n");

			fprintf(stdout,"canonname=%s\n",cur_addr->ai_canonname);
			cur_addr=cur_addr->ai_next;
		}while(cur_addr);
    freeaddrinfo(result);
	}
	return 0;
}