NetBSD/usr.bin/getaddrinfo/getaddrinfo.c

332 lines
7.7 KiB
C

/* $NetBSD: getaddrinfo.c,v 1.4 2014/04/22 02:23:03 ginsbach 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 1.4 2014/04/22 02:23:03 ginsbach 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"
static void usage(void) __dead;
static void printaddrinfo(struct addrinfo *);
static bool parse_af(const char *, int *);
static bool parse_protocol(const char *, int *);
static bool parse_socktype(const char *, int *);
static bool parse_numeric_tabular(const char *, int *, const char *const *,
size_t);
int
main(int argc, char **argv)
{
static const struct addrinfo zero_addrinfo;
struct addrinfo hints = zero_addrinfo;
struct addrinfo *addrinfo;
const char *hostname = NULL, *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 bool
parse_af(const char *string, int *afp)
{
return parse_numeric_tabular(string, afp, address_families,
__arraycount(address_families));
}
static bool
parse_protocol(const char *string, int *protop)
{
struct protoent *protoent;
char *end;
long value;
errno = 0;
value = strtol(string, &end, 0);
if ((string[0] == '\0') || (*end != '\0'))
goto numeric_failed;
if ((errno == ERANGE) && ((value == LONG_MAX) || (value == LONG_MIN)))
goto numeric_failed;
if ((value > INT_MAX) || (value < INT_MIN))
goto numeric_failed;
*protop = value;
return true;
numeric_failed:
protoent = getprotobyname(string);
if (protoent == NULL)
goto protoent_failed;
*protop = protoent->p_proto;
return true;
protoent_failed:
return false;
}
static bool
parse_socktype(const char *string, int *typep)
{
return parse_numeric_tabular(string, typep, socket_types,
__arraycount(socket_types));
}
static bool
parse_numeric_tabular(const char *string, int *valuep,
const char *const *table, size_t n)
{
char *end;
long value;
size_t i;
assert((uintmax_t)n <= (uintmax_t)INT_MAX);
errno = 0;
value = strtol(string, &end, 0);
if ((string[0] == '\0') || (*end != '\0'))
goto numeric_failed;
if ((errno == ERANGE) && ((value == LONG_MAX) || (value == LONG_MIN)))
goto numeric_failed;
if ((value > INT_MAX) || (value < INT_MIN))
goto numeric_failed;
*valuep = value;
return true;
numeric_failed:
for (i = 0; i < n; i++)
if ((table[i] != NULL) && (strcmp(string, table[i]) == 0))
break;
if (i == n)
goto table_failed;
*valuep = i;
return true;
table_failed:
return false;
}
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");
}
}