#include "apue.h"#include <netdb.h>#include <arpa/inet.h>#if defined(BSD) || defined(MACOS)#include <sys/socket.h>#include <netinet/in.h>#endifvoidprint_family(struct addrinfo *aip){	printf(" family ");	switch (aip->ai_family) {	case AF_INET:		printf("inet");		break;	case AF_INET6:		printf("inet6");		break;	case AF_UNIX:		printf("unix");		break;	case AF_UNSPEC:		printf("unspecified");		break;	default:		printf("unknown");	}}voidprint_type(struct addrinfo *aip){	printf(" type ");	switch (aip->ai_socktype) {	case SOCK_STREAM:		printf("stream");		break;	case SOCK_DGRAM:		printf("datagram");		break;	case SOCK_SEQPACKET:		printf("seqpacket");		break;	case SOCK_RAW:		printf("raw");		break;	default:		printf("unknown (%d)", aip->ai_socktype);	}}voidprint_protocol(struct addrinfo *aip){	printf(" protocol ");	switch (aip->ai_protocol) {	case 0:		printf("default");		break;	case IPPROTO_TCP:		printf("TCP");		break;	case IPPROTO_UDP:		printf("UDP");		break;	case IPPROTO_RAW:		printf("raw");		break;	default:		printf("unknown (%d)", aip->ai_protocol);	}}voidprint_flags(struct addrinfo *aip){	printf("flags");	if (aip->ai_flags == 0) {		printf(" 0");	} else {		if (aip->ai_flags & AI_PASSIVE)			printf(" passive");		if (aip->ai_flags & AI_CANONNAME)			printf(" canon");		if (aip->ai_flags & AI_NUMERICHOST)			printf(" numhost");#if defined(AI_NUMERICSERV)		if (aip->ai_flags & AI_NUMERICSERV)			printf(" numserv");#endif#if defined(AI_V4MAPPED)		if (aip->ai_flags & AI_V4MAPPED)			printf(" v4mapped");#endif#if defined(AI_ALL)		if (aip->ai_flags & AI_ALL)			printf(" all");#endif	}}intmain(int argc, char *argv[]){	struct addrinfo		*ailist, *aip;	struct addrinfo		hint;	struct sockaddr_in	*sinp;	const char 			*addr;	int 				err;	char 				abuf[INET_ADDRSTRLEN];	if (argc != 3)		err_quit("usage: %s nodename service", argv[0]);	hint.ai_flags = AI_CANONNAME;	hint.ai_family = 0;	hint.ai_socktype = 0;	hint.ai_protocol = 0;	hint.ai_addrlen = 0;	hint.ai_canonname = NULL;	hint.ai_addr = NULL;	hint.ai_next = NULL;	if ((err = getaddrinfo(argv[1], argv[2], &hint, &ailist)) != 0)		err_quit("getaddrinfo error: %s", gai_strerror(err));	for (aip = ailist; aip != NULL; aip = aip->ai_next) {		print_flags(aip);		print_family(aip);		print_type(aip);		print_protocol(aip);		printf("\n\thost %s", aip->ai_canonname?aip->ai_canonname:"-");		if (aip->ai_family == AF_INET) {			sinp = (struct sockaddr_in *)aip->ai_addr;			addr = inet_ntop(AF_INET, &sinp->sin_addr, abuf,			    INET_ADDRSTRLEN);			printf(" address %s", addr?addr:"unknown");			printf(" port %d", ntohs(sinp->sin_port));		}		printf("\n");	}	exit(0);}