testga.c

unix网络编程卷1：套接口API的全书源码

#include	"unp.h"

/*
 * Test program for getaddrinfo() and getnameinfo().
 */

			/* function prototypes for internal functions */
static void	do_errtest(void);
static void	do_funccall(const char *, const char *, int, int, int, int, int);
static int	do_onetest(char *, char *, struct addrinfo *, int);
static const char *str_fam(int);
static const char *str_sock(int);
static void	usage(const char *);

			/* globals */
int		vflag;

int
main(int argc, char **argv)
{
	int				doerrtest = 0;
	int				loopcount = 1;
	int				c, i;
	char			*host = NULL;
	char			hostbuf[NI_MAXHOST];
	char			*serv = NULL;
	char			servbuf[NI_MAXSERV];
	struct protoent	*proto;
	struct addrinfo	hints;		/* set by command-line options */

	if (argc < 2)
		usage("");

	memset(&hints, 0, sizeof(struct addrinfo));

	opterr = 0;		/* don't want getopt() writing to stderr */
	while ( (c = getopt(argc, argv, "cef:h:l:pr:s:t:v")) != -1) {
		switch (c) {
		case 'c':
			hints.ai_flags |= AI_CANONNAME;
			break;

		case 'e':
			doerrtest = 1;
			break;

		case 'f':			/* address family */
#ifdef	IPv4
			if (strcmp(optarg, "inet") == 0) {
				hints.ai_family = AF_INET;
				break;
			}
#endif
#ifdef	IPv6
			if (strcmp(optarg, "inet6") == 0) {
				hints.ai_family = AF_INET6;
				break;
			}
#endif
#ifdef	UNIXdomain
			if (strcmp(optarg, "unix") == 0) {
				hints.ai_family = AF_LOCAL;
				break;
			}
#endif
			usage("invalid -f option");

		case 'h':			/* host */
			strncpy(hostbuf, optarg, NI_MAXHOST-1);
			host = hostbuf;
			break;

		case 'l':			/* loop count */
			loopcount = atoi(optarg);
			break;

		case 'p':
			hints.ai_flags |= AI_PASSIVE;
			break;

		case 'r':			/* protocol */
			if ((proto = getprotobyname(optarg)) == NULL) {
				hints.ai_protocol = atoi(optarg);
			} else {
				hints.ai_protocol = proto->p_proto;
			}
			break;

		case 's':
			strncpy(servbuf, optarg, NI_MAXSERV-1);
			serv = servbuf;
			break;

		case 't':			/* socket type */
			if (strcmp(optarg, "stream") == 0) {
				hints.ai_socktype = SOCK_STREAM;
				break;
			}

			if (strcmp(optarg, "dgram") == 0) {
				hints.ai_socktype = SOCK_DGRAM;
				break;
			}

			if (strcmp(optarg, "raw") == 0) {
				hints.ai_socktype = SOCK_RAW;
				break;
			}

#ifdef	SOCK_RDM
			if (strcmp(optarg, "rdm") == 0) {
				hints.ai_socktype = SOCK_RDM;
				break;
			}
#endif

#ifdef	SOCK_SEQPACKET
			if (strcmp(optarg, "seqpacket") == 0) {
				hints.ai_socktype = SOCK_SEQPACKET;
				break;
			}
#endif
			usage("invalid -t option");

		case 'v':
			vflag = 1;
			break;

		case '?':
			usage("unrecognized option");
		}
	}
	if (optind < argc) {
		usage("extra args");
	}

	if (doerrtest) {
		do_errtest();
		exit(0);
	}

	for (i = 1; i <= loopcount; i++) {
		if (do_onetest(host, serv, &hints, i) > 0)
			exit(1);

		if (i % 1000 == 0) {
			printf(" %d", i);
			fflush(stdout);
		}
	}

	exit(0);
}

/*
 * Check that the right error codes are returned for invalid input.
 * Test all the errors that are easy to test for.
 */

static void
do_errtest(void)
{
		/* passive open with no hostname and no address family */
	do_funccall(NULL, "ftp", AI_PASSIVE, 0, 0, 0, 0);

		/* kind of hard to automatically test EAI_AGAIN ??? */

		/* invalid flags */
	do_funccall("localhost", NULL, 999999, 0, 0, 0, EAI_BADFLAGS);

		/* how to test EAI_FAIL ??? */

		/* invalid address family */
	do_funccall("localhost", NULL, 0, AF_SNA, 0, 0, EAI_FAMILY);

		/* hard to test for EAI_MEMORY: would have to malloc() until
		   failure, then give some back, then call getaddrinfo and
		   hope that its memory requests would not be satisfied. */

		/* to test for EAI_NODATA: would have to know of a host with
		   no A record in the DNS */

#ifdef	notdef	/* following depends on resolver, sigh */
		/* believe it or not, there is a registered domain "bar.com",
		   so the following should generate NO_DATA from the DNS */
	do_funccall("foo.bar.foo.bar.foo.bar.com", NULL, 0, 0, 0, 0, EAI_NODATA);
#endif

		/* no hostname, no service name */
	do_funccall(NULL, NULL, 0, 0, 0, 0, EAI_NONAME);

		/* invalid hostname (should be interpreted in local default domain) */
	do_funccall("lkjjkhjhghgfgfd", NULL, 0, 0, 0, 0, EAI_NONAME);

		/* invalid service name */
	do_funccall(NULL, "nosuchservice", 0, 0, 0, 0, EAI_NONAME);

		/* service valid but not supported for socket type */
	do_funccall("localhost", "telnet", 0, 0, SOCK_DGRAM, 0, EAI_SERVICE);

		/* service valid but not supported for socket type */
	do_funccall("localhost", "tftp", 0, 0, SOCK_STREAM, 0, EAI_SERVICE);

		/* invalid socket type */
	do_funccall("localhost", NULL, 0, AF_INET, SOCK_SEQPACKET, 0, EAI_SOCKTYPE);

		/* EAI_SYSTEM not generated by my implementation */
}

static void
do_funccall(const char *host, const char *serv,
			int flags, int family, int socktype, int protocol, int exprc)
{
	int				rc;
	struct addrinfo	hints, *res;

	memset(&hints, 0, sizeof(struct addrinfo));
	hints.ai_flags = flags;
	hints.ai_family = family;
	hints.ai_socktype = socktype;
	hints.ai_protocol = protocol;

	rc = getaddrinfo(host, serv, &hints, &res);
	if (rc != exprc) {
		printf("expected return = %d (%s),\nactual return = %d (%s)\n",
				exprc, gai_strerror(exprc), rc, gai_strerror(rc));
		if (host != NULL)
			printf("  host = %s\n", host);
		if (serv != NULL)
			printf("  serv = %s\n", serv);
		printf("  flags = %d, family = %s, socktype = %s, protocol = %d\n",
				flags, str_fam(family), str_sock(socktype), protocol);
		exit(2);
	}
}

static int
do_onetest(char *host, char *serv, struct addrinfo *hints, int iteration)
{
	int				rc, fd, verbose;
	struct addrinfo	*res, *rescopy;
	char			rhost[NI_MAXHOST], rserv[NI_MAXSERV];

	verbose = vflag && (iteration == 1);	/* only first time */

	if (host != NULL && verbose)
		printf("host = %s\n", host);
	if (serv != NULL && verbose)
		printf("serv = %s\n", serv);

	rc = getaddrinfo(host, serv, hints, &res);
	if (rc != 0) {
		printf("getaddrinfo return code = %d (%s)\n", rc, gai_strerror(rc));
		return(1);
	}

	rescopy = res;
	do {
		if (iteration == 1) {	/* always print results first time */
			printf("\nsocket(%s, %s, %d)", str_fam(res->ai_family),
					str_sock(res->ai_socktype), res->ai_protocol);

				/* canonname should be set only in first addrinfo{} */
			if (hints->ai_flags & AI_CANONNAME) {
				if (res->ai_canonname)
					printf(", ai_canonname = %s", res->ai_canonname);
			}
			printf("\n");

			printf("\taddress: %s\n",
				   Sock_ntop(res->ai_addr, res->ai_addrlen));
		}

			/* Call socket() to make sure return values are valid */
		fd = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
		if (fd < 0)
			printf("call to socket() failed!\n");
		else
			close(fd);

		/*
		 * Call getnameinfo() to check the reverse mapping.
		 */

		rc = getnameinfo(res->ai_addr, res->ai_addrlen,
						 rhost, NI_MAXHOST, rserv, NI_MAXSERV,
						 (res->ai_socktype == SOCK_DGRAM) ? NI_DGRAM: 0);
		if (rc == 0) {
			if (verbose)
				printf("\tgetnameinfo: host = %s, serv = %s\n",
					   rhost, rserv);
		} else
			printf("getnameinfo returned %d (%s)\n", rc, gai_strerror(rc));

	} while ( (res = res->ai_next) != NULL);

	freeaddrinfo(rescopy);
	return(0);
}

static void
usage(const char *msg)
{
	printf(
"usage: testaddrinfo [ options ]\n"
"options: -h <host>    (can be hostname or address string)\n"
"         -s <service> (can be service name or decimal port number)\n"
"         -c    AI_CANONICAL flag\n"
"         -p    AI_PASSIVE flag\n"
"         -l N  loop N times (check for memory leaks with ps)\n"
"         -f X  address family, X = inet, inet6, unix\n"
"         -r X  protocol, X = tcp, udp, ... or number e.g. 6, 17, ...\n"
"         -t X  socket type, X = stream, dgram, raw, rdm, seqpacket\n"
"         -v    verbose\n"
"         -e    only do test of error returns (no options required)\n"
"  without -e, one or both of <host> and <service> must be specified.\n"
);

	if (msg[0] != 0)
		printf("%s\n", msg);
	exit(1);
}

static const char *
str_fam(int family)
{
#ifdef	IPv4
	if (family == AF_INET)
		return("AF_INET");
#endif
#ifdef	IPv6
	if (family == AF_INET6)
		return("AF_INET6");
#endif
#ifdef	UNIXdomain
	if (family == AF_LOCAL)
		return("AF_LOCAL");
#endif
	return("<unknown family>");
}

static const char *
str_sock(int socktype)
{
	switch(socktype) {
	case SOCK_STREAM:	return "SOCK_STREAM";
	case SOCK_DGRAM:	return "SOCK_DGRAM";
	case SOCK_RAW:		return "SOCK_RAW";
#ifdef SOCK_RDM
	case SOCK_RDM:		return "SOCK_RDM";
#endif
#ifdef SOCK_SEQPACKET
	case SOCK_SEQPACKET:return "SOCK_SEQPACKET";
#endif
	default:		return "<unknown socktype>";
	}
}