1/* 2 * Copyright (c) 1997, 1998, 1999, 2000 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the Computer Systems 16 * Engineering Group at Lawrence Berkeley Laboratory. 17 * 4. Neither the name of the University nor of the Laboratory may be used 18 * to endorse or promote products derived from this software without 19 * specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34#ifndef lint 35static const char rcsid[] = 36 "@(#) $Id: ifaddrlist.c,v 1.9 2000/11/23 20:01:55 leres Exp $ (LBL)"; 37#endif 38 39#include <sys/param.h> 40#include <sys/file.h> 41#include <sys/ioctl.h> 42#include <sys/socket.h> 43#ifdef HAVE_SYS_SOCKIO_H 44#include <sys/sockio.h> 45#endif 46#include <sys/time.h> /* concession to AIX */ 47 48#if __STDC__ 49struct mbuf; 50struct rtentry; 51#endif 52 53#include <net/if.h> 54#include <netinet/in.h> 55 56#include <ctype.h> 57#include <errno.h> 58#include <memory.h> 59#include <stdio.h> 60#include <stdlib.h> 61#include <string.h> 62#include <unistd.h> 63 64#include "ifaddrlist.h" 65 66/* 67 * Return the interface list 68 */ 69int 70ifaddrlist(register struct ifaddrlist **ipaddrp, register char *errbuf) 71{ 72 register int fd, nipaddr; 73#ifdef HAVE_SOCKADDR_SA_LEN 74 size_t n; 75#endif 76 register struct ifreq *ifrp, *ifend, *ifnext, *mp; 77 register struct sockaddr_in *sin; 78 register struct ifaddrlist *al; 79 struct ifconf ifc; 80 struct ifreq ibuf[(32 * 1024) / sizeof(struct ifreq)], ifr; 81#define MAX_IPADDR ((int)(sizeof(ibuf) / sizeof(ibuf[0]))) 82 static struct ifaddrlist ifaddrlist[MAX_IPADDR]; 83 char device[sizeof(ifr.ifr_name) + 1]; 84 85 fd = socket(AF_INET, SOCK_DGRAM, 0); 86 if (fd < 0) { 87 (void)sprintf(errbuf, "socket: %s", strerror(errno)); 88 return (-1); 89 } 90 ifc.ifc_len = sizeof(ibuf); 91 ifc.ifc_buf = (caddr_t)ibuf; 92 93 if (ioctl(fd, SIOCGIFCONF, (char *)&ifc) < 0 || 94 ifc.ifc_len < (int)sizeof(struct ifreq)) { 95 if (errno == EINVAL) 96 (void)sprintf(errbuf, 97 "SIOCGIFCONF: ifreq struct too small (%zu bytes)", 98 sizeof(ibuf)); 99 else 100 (void)sprintf(errbuf, "SIOCGIFCONF: %s", 101 strerror(errno)); 102 (void)close(fd); 103 return (-1); 104 } 105 ifrp = ibuf; 106 ifend = (struct ifreq *)((char *)ibuf + ifc.ifc_len); 107 108 al = ifaddrlist; 109 mp = NULL; 110 nipaddr = 0; 111 for (; ifrp < ifend; ifrp = ifnext) { 112#ifdef HAVE_SOCKADDR_SA_LEN 113 n = ifrp->ifr_addr.sa_len + sizeof(ifrp->ifr_name); 114 if (n < sizeof(*ifrp)) 115 ifnext = ifrp + 1; 116 else 117 ifnext = (struct ifreq *)((char *)ifrp + n); 118 if (ifrp->ifr_addr.sa_family != AF_INET) 119 continue; 120#else 121 ifnext = ifrp + 1; 122#endif 123 /* 124 * Need a template to preserve address info that is 125 * used below to locate the next entry. (Otherwise, 126 * SIOCGIFFLAGS stomps over it because the requests 127 * are returned in a union.) 128 */ 129 strncpy(ifr.ifr_name, ifrp->ifr_name, sizeof(ifr.ifr_name)); 130 if (ioctl(fd, SIOCGIFFLAGS, (char *)&ifr) < 0) { 131 if (errno == ENXIO) 132 continue; 133 (void)sprintf(errbuf, "SIOCGIFFLAGS: %.*s: %s", 134 (int)sizeof(ifr.ifr_name), ifr.ifr_name, 135 strerror(errno)); 136 (void)close(fd); 137 return (-1); 138 } 139 140 /* Must be up */ 141 if ((ifr.ifr_flags & IFF_UP) == 0) 142 continue; 143 144 145 (void)strncpy(device, ifr.ifr_name, sizeof(ifr.ifr_name)); 146 device[sizeof(device) - 1] = '\0'; 147#ifdef sun 148 /* Ignore sun virtual interfaces */ 149 if (strchr(device, ':') != NULL) 150 continue; 151#endif 152 if (ioctl(fd, SIOCGIFADDR, (char *)&ifr) < 0) { 153 (void)sprintf(errbuf, "SIOCGIFADDR: %s: %s", 154 device, strerror(errno)); 155 (void)close(fd); 156 return (-1); 157 } 158 159 if (nipaddr >= MAX_IPADDR) { 160 (void)sprintf(errbuf, "Too many interfaces (%d)", 161 MAX_IPADDR); 162 (void)close(fd); 163 return (-1); 164 } 165 sin = (struct sockaddr_in *)&ifr.ifr_addr; 166 al->addr = sin->sin_addr.s_addr; 167 al->device = strdup(device); 168 ++al; 169 ++nipaddr; 170 } 171 (void)close(fd); 172 173 *ipaddrp = ifaddrlist; 174 return (nipaddr); 175} 176