/*
** Compile: gcc -Wall dump-addrinfo.c -o dump-addrinfo
*/

#include <errno.h>
#include <error.h>
#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <netinet/in.h>
#include <sys/socket.h>

int dump_addrinfo(const char *host, const char *service)
{
	struct addrinfo *ai, *runp;
	struct addrinfo hints;
	char hostbuf[50], portbuf[10];
	int e;
	
	memset(&hints, '\0', sizeof (hints));
	hints.ai_flags = AI_ADDRCONFIG;
	hints.ai_socktype = SOCK_STREAM;
	e = getaddrinfo(host, service, &hints, &ai);
	if (e != 0) {
		/* error(EXIT_FAILURE, 0, "getaddrinfo: %s", gai_strerror(e)); */
		return -1;
	}
	
	for (runp = ai; runp != NULL; runp = runp->ai_next) {
		printf("family: %d, socktype: %d, protocol: %d, ", runp->ai_family, runp->ai_socktype, runp->ai_protocol);
		e = getnameinfo(
			runp->ai_addr, runp->ai_addrlen,
			hostbuf, sizeof(hostbuf),
			portbuf, sizeof(portbuf),
			NI_NUMERICHOST | NI_NUMERICSERV
		);
		printf("host: %s, port: %s\n", hostbuf, portbuf);
	}
	freeaddrinfo(ai);
	
	return 0;
}

int main(int argc, char *argv[])
{
	if (argc != 3) {
		fprintf(stderr, "Usage: dump-addrinfo host serivce\n");
	}
	
	dump_addrinfo(argv[1], argv[2]);
	
	exit(0);
}