1 /* $NetBSD: ifaddrlist.c,v 1.4 2000/04/13 07:53:29 itojun Exp $ */ 2 3 /* 4 * Copyright (c) 1997 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the Computer Systems 18 * Engineering Group at Lawrence Berkeley Laboratory. 19 * 4. Neither the name of the University nor of the Laboratory may be used 20 * to endorse or promote products derived from this software without 21 * specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #ifndef lint 38 #if 0 39 static const char rcsid[] = 40 "@(#) Header: ifaddrlist.c,v 1.2 97/04/22 13:31:05 leres Exp (LBL)"; 41 #else 42 __RCSID("$NetBSD: ifaddrlist.c,v 1.4 2000/04/13 07:53:29 itojun Exp $"); 43 #endif 44 #endif 45 46 #include <sys/param.h> 47 #include <sys/file.h> 48 #include <sys/ioctl.h> 49 #include <sys/socket.h> 50 #ifdef HAVE_SYS_SOCKIO_H 51 #include <sys/sockio.h> 52 #endif 53 #include <sys/time.h> /* concession to AIX */ 54 55 #if __STDC__ 56 struct mbuf; 57 struct rtentry; 58 #endif 59 60 #include <net/if.h> 61 #include <netinet/in.h> 62 #include <arpa/inet.h> 63 64 #include <ctype.h> 65 #include <errno.h> 66 #include <memory.h> 67 #include <stdio.h> 68 #include <stdlib.h> 69 #include <string.h> 70 #include <unistd.h> 71 #ifdef HAVE_IFADDRS_H 72 #include <ifaddrs.h> 73 #endif 74 75 #include "gnuc.h" 76 #ifdef HAVE_OS_PROTO_H 77 #include "os-proto.h" 78 #endif 79 80 #include "ifaddrlist.h" 81 #include "savestr.h" 82 83 84 /* Not all systems have IFF_LOOPBACK */ 85 #ifdef HAVE_IFADDRS_H 86 #ifdef IFF_LOOPBACK 87 #define ISLOOPBACK(p) ((p)->ifa_flags & IFF_LOOPBACK) 88 #else 89 #define ISLOOPBACK(p) (strcmp((p)->ifa_name, "lo0") == 0) 90 #endif 91 #else 92 #ifdef IFF_LOOPBACK 93 #define ISLOOPBACK(p) ((p)->ifr_flags & IFF_LOOPBACK) 94 #else 95 #define ISLOOPBACK(p) (strcmp((p)->ifr_name, "lo0") == 0) 96 #endif 97 #endif 98 99 #define MAX_IPADDR 256 100 101 /* 102 * Return the interface list 103 */ 104 int 105 ifaddrlist(struct ifaddrlist **ipaddrp, char *errbuf, int buflen) 106 { 107 #ifdef HAVE_IFADDRS_H 108 int nipaddr; 109 struct sockaddr_in *sin; 110 struct ifaddrs *ifap, *ifa; 111 struct ifaddrlist *al; 112 static struct ifaddrlist ifaddrlist[MAX_IPADDR]; 113 114 al = ifaddrlist; 115 nipaddr = 0; 116 117 if (getifaddrs(&ifap) != 0) { 118 (void)snprintf(errbuf, buflen, "getifaddrs: %s", 119 strerror(errno)); 120 return (-1); 121 } 122 123 for (ifa = ifap; ifa; ifa = ifa->ifa_next) { 124 if (ifa->ifa_addr->sa_family != AF_INET) 125 continue; 126 127 /* Must be up */ 128 if ((ifa->ifa_flags & IFF_UP) == 0) 129 continue; 130 131 /* 132 * Must not be a loopback address (127/8) 133 */ 134 sin = (struct sockaddr_in *)ifa->ifa_addr; 135 if (ISLOOPBACK(ifa)) 136 if (ntohl(sin->sin_addr.s_addr) == INADDR_LOOPBACK) 137 continue; 138 139 al->addr = sin->sin_addr.s_addr; 140 al->device = savestr(ifa->ifa_name); 141 ++al; 142 ++nipaddr; 143 } 144 *ipaddrp = ifaddrlist; 145 freeifaddrs(ifap); 146 return (nipaddr); 147 #else 148 int fd, nipaddr; 149 #ifdef HAVE_SOCKADDR_SA_LEN 150 int n; 151 #endif 152 struct ifreq *ifrp, *ifend, *ifnext, *mp; 153 struct sockaddr_in *sin; 154 struct ifaddrlist *al; 155 struct ifconf ifc; 156 struct ifreq ibuf[MAX_IPADDR], ifr; 157 char device[sizeof(ifr.ifr_name) + 1]; 158 static struct ifaddrlist ifaddrlist[MAX_IPADDR]; 159 160 fd = socket(AF_INET, SOCK_DGRAM, 0); 161 if (fd < 0) { 162 (void)snprintf(errbuf, buflen, "socket: %s", strerror(errno)); 163 return (-1); 164 } 165 ifc.ifc_len = sizeof(ibuf); 166 ifc.ifc_buf = (caddr_t)ibuf; 167 168 if (ioctl(fd, SIOCGIFCONF, (char *)&ifc) < 0 || 169 ifc.ifc_len < sizeof(struct ifreq)) { 170 (void)snprintf(errbuf, buflen, "SIOCGIFCONF: %s", strerror(errno)); 171 (void)close(fd); 172 return (-1); 173 } 174 ifrp = ibuf; 175 ifend = (struct ifreq *)((char *)ibuf + ifc.ifc_len); 176 177 al = ifaddrlist; 178 mp = NULL; 179 nipaddr = 0; 180 for (; ifrp < ifend; ifrp = ifnext) { 181 #ifdef HAVE_SOCKADDR_SA_LEN 182 n = ifrp->ifr_addr.sa_len + sizeof(ifrp->ifr_name); 183 if (n < sizeof(*ifrp)) 184 ifnext = ifrp + 1; 185 else 186 ifnext = (struct ifreq *)((char *)ifrp + n); 187 if (ifrp->ifr_addr.sa_family != AF_INET) 188 continue; 189 #else 190 ifnext = ifrp + 1; 191 #endif 192 /* 193 * Need a template to preserve address info that is 194 * used below to locate the next entry. (Otherwise, 195 * SIOCGIFFLAGS stomps over it because the requests 196 * are returned in a union.) 197 */ 198 strncpy(ifr.ifr_name, ifrp->ifr_name, sizeof(ifr.ifr_name)); 199 if (ioctl(fd, SIOCGIFFLAGS, (char *)&ifr) < 0) { 200 if (errno == ENXIO) 201 continue; 202 (void)snprintf(errbuf, buflen, "SIOCGIFFLAGS: %.*s: %s", 203 (int)sizeof(ifr.ifr_name), ifr.ifr_name, 204 strerror(errno)); 205 (void)close(fd); 206 return (-1); 207 } 208 209 /* Must be up */ 210 if ((ifr.ifr_flags & IFF_UP) == 0) 211 continue; 212 213 /* 214 * Must not be a loopback address (127/8) 215 */ 216 sin = (struct sockaddr_in *)&ifrp->ifr_addr; 217 if (ISLOOPBACK(&ifr)) 218 if (ntohl(sin->sin_addr.s_addr) == INADDR_LOOPBACK) 219 continue; 220 221 (void)strncpy(device, ifrp->ifr_name, sizeof(ifrp->ifr_name)); 222 device[sizeof(device) - 1] = '\0'; 223 224 al->addr = sin->sin_addr.s_addr; 225 al->device = savestr(device); 226 ++al; 227 ++nipaddr; 228 } 229 (void)close(fd); 230 231 *ipaddrp = ifaddrlist; 232 return (nipaddr); 233 #endif 234 } 235