findsvc.c

unix环境高级编程第二版配套源代码 unix环境高级编程第二版配套源代码

#include "apue.h"
#include <netdb.h>
#include <arpa/inet.h>
#if defined(BSD) || defined(MACOS)
#include <sys/socket.h>
#include <netinet/in.h>
#endif

void
print_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");
	}
}

void
print_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);
	}
}

void
print_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);
	}
}

void
print_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
	}
}

int
main(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);
}