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ifconf.c
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t_compat.c
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t_ifconf.sh
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t_ifconfig.sh
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Editing: ifconf.c
/* $NetBSD: ifconf.c,v 1.1 2014/12/08 04:23:03 ozaki-r Exp $ */ /* * Copyright (c) 2014 The NetBSD Foundation, Inc. * All rights reserved. * * 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 AUTHOR ``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 AUTHOR 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: ifconf.c,v 1.1 2014/12/08 04:23:03 ozaki-r Exp $"); #include <sys/types.h> #include <sys/socket.h> #include <sys/sockio.h> #include <sys/ioctl.h> #include <net/if.h> #include <stdio.h> #include <err.h> #include <stdlib.h> #include <unistd.h> #include <string.h> static void help(void) { fprintf(stderr, "usage:\n\t%s total\n\t%s list [<nifreqs>]\n", getprogname(), getprogname()); exit(EXIT_FAILURE); } static int get_number_of_entries(void) { int fd, r; struct ifconf ifc; fd = socket(AF_INET, SOCK_DGRAM, 0); if (fd == -1) err(EXIT_FAILURE, "socket"); ifc.ifc_len = 0; ifc.ifc_buf = NULL; r = ioctl(fd, SIOCGIFCONF, &ifc); if (r == -1) err(EXIT_FAILURE, "ioctl"); close(fd); return ifc.ifc_len / sizeof(struct ifreq); } static void show_number_of_entries(void) { printf("%d\n", get_number_of_entries()); } static void show_interfaces(int nifreqs) { int i, fd, r; struct ifconf ifc; struct ifreq *ifreqs; if (nifreqs == 0) nifreqs = get_number_of_entries(); if (nifreqs <= 0) errx(EXIT_FAILURE, "nifreqs=%d", nifreqs); ifreqs = malloc(sizeof(struct ifreq) * nifreqs); if (ifreqs == NULL) err(EXIT_FAILURE, "malloc(sizeof(ifreq) * %d)", nifreqs); fd = socket(AF_INET, SOCK_DGRAM, 0); if (fd == -1) err(EXIT_FAILURE, "socket"); ifc.ifc_len = sizeof(struct ifreq) * nifreqs; ifc.ifc_req = ifreqs; r = ioctl(fd, SIOCGIFCONF, &ifc); if (r == -1) err(EXIT_FAILURE, "ioctl"); close(fd); for (i=0; i < (int)(ifc.ifc_len / sizeof(struct ifreq)); i++) { printf("%s: af=%hhu socklen=%hhu\n", ifreqs[i].ifr_name, ifreqs[i].ifr_addr.sa_family, ifreqs[i].ifr_addr.sa_len); } free(ifreqs); } int main(int argc, char *argv[]) { if (argc < 2) help(); if (strcmp(argv[1], "total") == 0) { show_number_of_entries(); } else if (strcmp(argv[1], "list") == 0) { if (argc == 2) show_interfaces(0); else if (argc == 3) show_interfaces(atoi(argv[2])); else help(); } else help(); return EXIT_SUCCESS; }
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