332 lines
7.6 KiB
C
332 lines
7.6 KiB
C
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/* $NetBSD: getaddrinfo.c,v 1.4 2014/04/22 02:23:03 ginsbach Exp $ */
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/*-
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* Copyright (c) 2013 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Taylor R. Campbell.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <assert.h>
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#include <err.h>
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#include <errno.h>
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#include <limits.h>
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#include <netdb.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <util.h>
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#include "tables.h"
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static void usage(void) __dead;
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static void printaddrinfo(struct addrinfo *);
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static bool parse_af(const char *, int *);
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static bool parse_protocol(const char *, int *);
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static bool parse_socktype(const char *, int *);
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static bool parse_numeric_tabular(const char *, int *, const char *const *,
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size_t);
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int
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main(int argc, char **argv)
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{
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static const struct addrinfo zero_addrinfo;
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struct addrinfo hints = zero_addrinfo;
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struct addrinfo *addrinfo;
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const char *hostname = NULL, *service = NULL;
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int ch;
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int error;
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setprogname(argv[0]);
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hints.ai_family = AF_UNSPEC;
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hints.ai_socktype = 0;
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hints.ai_protocol = 0;
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hints.ai_flags = 0;
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while ((ch = getopt(argc, argv, "cf:nNp:Ps:t:")) != -1) {
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switch (ch) {
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case 'c':
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hints.ai_flags |= AI_CANONNAME;
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break;
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case 'f':
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if (!parse_af(optarg, &hints.ai_family)) {
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warnx("invalid address family: %s", optarg);
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usage();
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}
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break;
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case 'n':
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hints.ai_flags |= AI_NUMERICHOST;
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break;
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case 'N':
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hints.ai_flags |= AI_NUMERICSERV;
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break;
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case 's':
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service = optarg;
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break;
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case 'p':
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if (!parse_protocol(optarg, &hints.ai_protocol)) {
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warnx("invalid protocol: %s", optarg);
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usage();
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}
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break;
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case 'P':
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hints.ai_flags |= AI_PASSIVE;
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break;
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case 't':
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if (!parse_socktype(optarg, &hints.ai_socktype)) {
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warnx("invalid socket type: %s", optarg);
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usage();
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}
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break;
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case '?':
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default:
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usage();
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}
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}
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argc -= optind;
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argv += optind;
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if (!((argc == 1) || ((argc == 0) && (hints.ai_flags & AI_PASSIVE))))
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usage();
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if (argc == 1)
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hostname = argv[0];
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if (service != NULL) {
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char *p;
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if ((p = strchr(service, '/')) != NULL) {
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if (hints.ai_protocol != 0) {
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warnx("protocol already specified");
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usage();
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}
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*p = '\0';
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p++;
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if (!parse_protocol(p, &hints.ai_protocol)) {
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warnx("invalid protocol: %s", p);
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usage();
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}
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}
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}
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error = getaddrinfo(hostname, service, &hints, &addrinfo);
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if (error)
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errx(1, "%s", gai_strerror(error));
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if ((hints.ai_flags & AI_CANONNAME) && (addrinfo != NULL)) {
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if (printf("canonname %s\n", addrinfo->ai_canonname) < 0)
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err(1, "printf");
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}
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printaddrinfo(addrinfo);
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freeaddrinfo(addrinfo);
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return 0;
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}
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static void __dead
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usage(void)
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{
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(void)fprintf(stderr, "Usage: %s", getprogname());
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(void)fprintf(stderr,
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" [-f <family>] [-p <protocol>] [-t <socktype>] [-s <service>]\n");
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(void)fprintf(stderr, " [-cnNP] [<hostname>]\n");
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exit(1);
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}
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static bool
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parse_af(const char *string, int *afp)
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{
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return parse_numeric_tabular(string, afp, address_families,
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__arraycount(address_families));
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}
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static bool
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parse_protocol(const char *string, int *protop)
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{
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struct protoent *protoent;
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char *end;
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long value;
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errno = 0;
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value = strtol(string, &end, 0);
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if ((string[0] == '\0') || (*end != '\0'))
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goto numeric_failed;
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if ((errno == ERANGE) && ((value == LONG_MAX) || (value == LONG_MIN)))
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goto numeric_failed;
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if ((value > INT_MAX) || (value < INT_MIN))
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goto numeric_failed;
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*protop = value;
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return true;
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numeric_failed:
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protoent = getprotobyname(string);
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if (protoent == NULL)
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goto protoent_failed;
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*protop = protoent->p_proto;
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return true;
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protoent_failed:
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return false;
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}
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static bool
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parse_socktype(const char *string, int *typep)
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{
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return parse_numeric_tabular(string, typep, socket_types,
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__arraycount(socket_types));
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}
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static bool
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parse_numeric_tabular(const char *string, int *valuep,
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const char *const *table, size_t n)
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{
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char *end;
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long value;
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size_t i;
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assert((uintmax_t)n <= (uintmax_t)INT_MAX);
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errno = 0;
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value = strtol(string, &end, 0);
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if ((string[0] == '\0') || (*end != '\0'))
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goto numeric_failed;
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if ((errno == ERANGE) && ((value == LONG_MAX) || (value == LONG_MIN)))
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goto numeric_failed;
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if ((value > INT_MAX) || (value < INT_MIN))
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goto numeric_failed;
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*valuep = value;
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return true;
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numeric_failed:
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for (i = 0; i < n; i++)
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if ((table[i] != NULL) && (strcmp(string, table[i]) == 0))
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break;
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if (i == n)
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goto table_failed;
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*valuep = i;
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return true;
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table_failed:
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return false;
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}
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static void
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printaddrinfo(struct addrinfo *addrinfo)
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{
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struct addrinfo *ai;
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char buf[1024];
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int n;
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struct protoent *protoent;
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for (ai = addrinfo; ai != NULL; ai = ai->ai_next) {
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/* Print the socket type. */
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if ((ai->ai_socktype >= 0) &&
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((size_t)ai->ai_socktype < __arraycount(socket_types)) &&
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(socket_types[ai->ai_socktype] != NULL))
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n = printf("%s", socket_types[ai->ai_socktype]);
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else
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n = printf("%d", ai->ai_socktype);
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if (n < 0)
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err(1, "printf");
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/* Print the address family. */
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if ((ai->ai_family >= 0) &&
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((size_t)ai->ai_family < __arraycount(address_families)) &&
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(address_families[ai->ai_family] != NULL))
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n = printf(" %s", address_families[ai->ai_family]);
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else
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n = printf(" %d", ai->ai_family);
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if (n < 0)
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err(1, "printf");
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/* Print the protocol number. */
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protoent = getprotobynumber(ai->ai_protocol);
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if (protoent == NULL)
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n = printf(" %d", ai->ai_protocol);
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else
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n = printf(" %s", protoent->p_name);
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if (n < 0)
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err(1, "printf");
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/* Format the sockaddr. */
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switch (ai->ai_family) {
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case AF_INET:
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case AF_INET6:
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n = sockaddr_snprintf(buf, sizeof(buf), " %a %p",
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ai->ai_addr);
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break;
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default:
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n = sockaddr_snprintf(buf, sizeof(buf),
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"%a %p %I %F %R %S", ai->ai_addr);
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}
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/*
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* Check for sockaddr_snprintf failure.
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*
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* XXX sockaddr_snprintf's error reporting is botched
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* -- man page says it sets errno, but if getnameinfo
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* fails, errno is not where it reports the error...
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*/
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if (n < 0) {
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warnx("sockaddr_snprintf failed");
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continue;
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}
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if (sizeof(buf) <= (size_t)n)
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warnx("truncated sockaddr_snprintf output");
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/* Print the formatted sockaddr. */
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if (printf("%s\n", buf) < 0)
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err(1, "printf");
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}
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}
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