135 lines
3.3 KiB
C
135 lines
3.3 KiB
C
/* $NetBSD: ifconf.c,v 1.1 2014/12/08 04:23:03 ozaki-r Exp $ */
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/*
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* Copyright (c) 2014 The NetBSD Foundation, Inc.
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* All rights reserved.
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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 AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__RCSID("$NetBSD: ifconf.c,v 1.1 2014/12/08 04:23:03 ozaki-r Exp $");
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/sockio.h>
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#include <sys/ioctl.h>
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#include <net/if.h>
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#include <stdio.h>
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#include <err.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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static void
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help(void)
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{
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fprintf(stderr, "usage:\n\t%s total\n\t%s list [<nifreqs>]\n",
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getprogname(), getprogname());
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exit(EXIT_FAILURE);
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}
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static int
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get_number_of_entries(void)
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{
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int fd, r;
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struct ifconf ifc;
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fd = socket(AF_INET, SOCK_DGRAM, 0);
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if (fd == -1)
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err(EXIT_FAILURE, "socket");
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ifc.ifc_len = 0;
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ifc.ifc_buf = NULL;
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r = ioctl(fd, SIOCGIFCONF, &ifc);
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if (r == -1)
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err(EXIT_FAILURE, "ioctl");
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close(fd);
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return ifc.ifc_len / sizeof(struct ifreq);
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}
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static void
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show_number_of_entries(void)
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{
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printf("%d\n", get_number_of_entries());
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}
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static void
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show_interfaces(int nifreqs)
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{
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int i, fd, r;
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struct ifconf ifc;
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struct ifreq *ifreqs;
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if (nifreqs == 0)
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nifreqs = get_number_of_entries();
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if (nifreqs <= 0)
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errx(EXIT_FAILURE, "nifreqs=%d", nifreqs);
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ifreqs = malloc(sizeof(struct ifreq) * nifreqs);
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if (ifreqs == NULL)
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err(EXIT_FAILURE, "malloc(sizeof(ifreq) * %d)", nifreqs);
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fd = socket(AF_INET, SOCK_DGRAM, 0);
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if (fd == -1)
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err(EXIT_FAILURE, "socket");
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ifc.ifc_len = sizeof(struct ifreq) * nifreqs;
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ifc.ifc_req = ifreqs;
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r = ioctl(fd, SIOCGIFCONF, &ifc);
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if (r == -1)
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err(EXIT_FAILURE, "ioctl");
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close(fd);
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for (i=0; i < (int)(ifc.ifc_len / sizeof(struct ifreq)); i++) {
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printf("%s: af=%hhu socklen=%hhu\n", ifreqs[i].ifr_name,
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ifreqs[i].ifr_addr.sa_family, ifreqs[i].ifr_addr.sa_len);
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}
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free(ifreqs);
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}
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int
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main(int argc, char *argv[])
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{
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if (argc < 2)
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help();
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if (strcmp(argv[1], "total") == 0) {
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show_number_of_entries();
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} else if (strcmp(argv[1], "list") == 0) {
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if (argc == 2)
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show_interfaces(0);
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else if (argc == 3)
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show_interfaces(atoi(argv[2]));
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else
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help();
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} else
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help();
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return EXIT_SUCCESS;
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}
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