/* $NetBSD: getaddrinfo.c,v 1.6 2025/02/06 19:35:28 christos Exp $ */

/* $NetBSD: getaddrinfo.c,v 1.6 2025/02/06 19:35:28 christos Exp $ */

/*-
* Copyright (c) 2013 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Taylor R. Campbell.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/

#include <sys/cdefs.h>
__RCSID("$NetBSD: getaddrinfo.c,v 1.6 2025/02/06 19:35:28 christos Exp $");

#include <sys/types.h>
#include <sys/socket.h>

#include <assert.h>
#include <err.h>
#include <errno.h>
#include <limits.h>
#include <netdb.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <util.h>

#include "tables.h"
#include "support.h"

static void usage(void) __dead;
static void printaddrinfo(struct addrinfo *);

int
main(int argc, char **argv)
{
static const struct addrinfo zero_addrinfo;
struct addrinfo hints = zero_addrinfo;
struct addrinfo *addrinfo;
const char *hostname = NULL;
char *service = NULL;
int ch;
int error;

setprogname(argv[0]);

hints.ai_family = AF_UNSPEC;
hints.ai_socktype = 0;
hints.ai_protocol = 0;
hints.ai_flags = 0;

while ((ch = getopt(argc, argv, "cf:nNp:Ps:t:")) != -1) {
switch (ch) {
case 'c':
hints.ai_flags |= AI_CANONNAME;
break;
case 'f':
if (!parse_af(optarg, &hints.ai_family)) {
warnx("invalid address family: %s", optarg);
usage();
}
break;
case 'n':
hints.ai_flags |= AI_NUMERICHOST;
break;
case 'N':
hints.ai_flags |= AI_NUMERICSERV;
break;
case 's':
service = optarg;
break;
case 'p':
if (!parse_protocol(optarg, &hints.ai_protocol)) {
warnx("invalid protocol: %s", optarg);
usage();
}
break;
case 'P':
hints.ai_flags |= AI_PASSIVE;
break;
case 't':
if (!parse_socktype(optarg, &hints.ai_socktype)) {
warnx("invalid socket type: %s", optarg);
usage();
}
break;
case '?':
default:
usage();
}
}

argc -= optind;
argv += optind;

if (!((argc == 1) || ((argc == 0) && (hints.ai_flags & AI_PASSIVE))))
usage();
if (argc == 1)
hostname = argv[0];

if (service != NULL) {
char *p;

if ((p = strchr(service, '/')) != NULL) {
if (hints.ai_protocol != 0) {
warnx("protocol already specified");
usage();
}
*p = '\0';
p++;

if (!parse_protocol(p, &hints.ai_protocol)) {
warnx("invalid protocol: %s", p);
usage();
}
}
}

error = getaddrinfo(hostname, service, &hints, &addrinfo);
if (error)
errx(1, "%s", gai_strerror(error));

if ((hints.ai_flags & AI_CANONNAME) && (addrinfo != NULL)) {
if (printf("canonname %s\n", addrinfo->ai_canonname) < 0)
err(1, "printf");
}

printaddrinfo(addrinfo);

freeaddrinfo(addrinfo);

return 0;
}

static void __dead
usage(void)
{

(void)fprintf(stderr, "Usage: %s", getprogname());
(void)fprintf(stderr,
" [-f <family>] [-p <protocol>] [-t <socktype>] [-s <service>]\n");
(void)fprintf(stderr, " [-cnNP] [<hostname>]\n");
exit(1);
}

static void
printaddrinfo(struct addrinfo *addrinfo)
{
struct addrinfo *ai;
char buf[1024];
int n;
struct protoent *protoent;

for (ai = addrinfo; ai != NULL; ai = ai->ai_next) {
/* Print the socket type. */
if ((ai->ai_socktype >= 0) &&
((size_t)ai->ai_socktype < __arraycount(socket_types)) &&
(socket_types[ai->ai_socktype] != NULL))
n = printf("%s", socket_types[ai->ai_socktype]);
else
n = printf("%d", ai->ai_socktype);
if (n < 0)
err(1, "printf");

/* Print the address family. */
if ((ai->ai_family >= 0) &&
((size_t)ai->ai_family < __arraycount(address_families)) &&
(address_families[ai->ai_family] != NULL))
n = printf(" %s", address_families[ai->ai_family]);
else
n = printf(" %d", ai->ai_family);
if (n < 0)
err(1, "printf");

/* Print the protocol number. */
protoent = getprotobynumber(ai->ai_protocol);
if (protoent == NULL)
n = printf(" %d", ai->ai_protocol);
else
n = printf(" %s", protoent->p_name);
if (n < 0)
err(1, "printf");

/* Format the sockaddr. */
switch (ai->ai_family) {
case AF_INET:
case AF_INET6:
n = sockaddr_snprintf(buf, sizeof(buf), " %a %p",
ai->ai_addr);
break;
default:
n = sockaddr_snprintf(buf, sizeof(buf),
"%a %p %I %F %R %S", ai->ai_addr);
}

/*
* Check for sockaddr_snprintf failure.
*
* XXX sockaddr_snprintf's error reporting is botched
* -- man page says it sets errno, but if getnameinfo
* fails, errno is not where it reports the error...
*/
if (n < 0) {
warnx("sockaddr_snprintf failed");
continue;
}
if (sizeof(buf) <= (size_t)n)
warnx("truncated sockaddr_snprintf output");

/* Print the formatted sockaddr. */
if (printf("%s\n", buf) < 0)
err(1, "printf");
}
}