1 /* $NetBSD: ifaddrlist.c,v 1.5 2002/07/06 21:51:30 wiz 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 1.5 2002/07/06 21:51:30 wiz 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 struct mbuf; 56 struct rtentry; 57 58 #include <net/if.h> 59 #include <netinet/in.h> 60 #include <arpa/inet.h> 61 62 #include <ctype.h> 63 #include <errno.h> 64 #include <memory.h> 65 #include <stdio.h> 66 #include <stdlib.h> 67 #include <string.h> 68 #include <unistd.h> 69 #ifdef HAVE_IFADDRS_H 70 #include <ifaddrs.h> 71 #endif 72 73 #include "gnuc.h" 74 #ifdef HAVE_OS_PROTO_H 75 #include "os-proto.h" 76 #endif 77 78 #include "ifaddrlist.h" 79 #include "savestr.h" 80 81 82 /* Not all systems have IFF_LOOPBACK */ 83 #ifdef HAVE_IFADDRS_H 84 #ifdef IFF_LOOPBACK 85 #define ISLOOPBACK(p) ((p)->ifa_flags & IFF_LOOPBACK) 86 #else 87 #define ISLOOPBACK(p) (strcmp((p)->ifa_name, "lo0") == 0) 88 #endif 89 #else 90 #ifdef IFF_LOOPBACK 91 #define ISLOOPBACK(p) ((p)->ifr_flags & IFF_LOOPBACK) 92 #else 93 #define ISLOOPBACK(p) (strcmp((p)->ifr_name, "lo0") == 0) 94 #endif 95 #endif 96 97 #define MAX_IPADDR 256 98 99 /* 100 * Return the interface list 101 */ 102 int 103 ifaddrlist(struct ifaddrlist **ipaddrp, char *errbuf, int buflen) 104 { 105 #ifdef HAVE_IFADDRS_H 106 int nipaddr; 107 struct sockaddr_in *sin; 108 struct ifaddrs *ifap, *ifa; 109 struct ifaddrlist *al; 110 static struct ifaddrlist ifaddrlist[MAX_IPADDR]; 111 112 al = ifaddrlist; 113 nipaddr = 0; 114 115 if (getifaddrs(&ifap) != 0) { 116 (void)snprintf(errbuf, buflen, "getifaddrs: %s", 117 strerror(errno)); 118 return (-1); 119 } 120 121 for (ifa = ifap; ifa; ifa = ifa->ifa_next) { 122 if (ifa->ifa_addr->sa_family != AF_INET) 123 continue; 124 125 /* Must be up */ 126 if ((ifa->ifa_flags & IFF_UP) == 0) 127 continue; 128 129 /* 130 * Must not be a loopback address (127/8) 131 */ 132 sin = (struct sockaddr_in *)ifa->ifa_addr; 133 if (ISLOOPBACK(ifa)) 134 if (ntohl(sin->sin_addr.s_addr) == INADDR_LOOPBACK) 135 continue; 136 137 al->addr = sin->sin_addr.s_addr; 138 al->device = savestr(ifa->ifa_name); 139 ++al; 140 ++nipaddr; 141 } 142 *ipaddrp = ifaddrlist; 143 freeifaddrs(ifap); 144 return (nipaddr); 145 #else 146 int fd, nipaddr; 147 #ifdef HAVE_SOCKADDR_SA_LEN 148 int n; 149 #endif 150 struct ifreq *ifrp, *ifend, *ifnext, *mp; 151 struct sockaddr_in *sin; 152 struct ifaddrlist *al; 153 struct ifconf ifc; 154 struct ifreq ibuf[MAX_IPADDR], ifr; 155 char device[sizeof(ifr.ifr_name) + 1]; 156 static struct ifaddrlist ifaddrlist[MAX_IPADDR]; 157 158 fd = socket(AF_INET, SOCK_DGRAM, 0); 159 if (fd < 0) { 160 (void)snprintf(errbuf, buflen, "socket: %s", strerror(errno)); 161 return (-1); 162 } 163 ifc.ifc_len = sizeof(ibuf); 164 ifc.ifc_buf = (caddr_t)ibuf; 165 166 if (ioctl(fd, SIOCGIFCONF, (char *)&ifc) < 0 || 167 ifc.ifc_len < sizeof(struct ifreq)) { 168 (void)snprintf(errbuf, buflen, "SIOCGIFCONF: %s", strerror(errno)); 169 (void)close(fd); 170 return (-1); 171 } 172 ifrp = ibuf; 173 ifend = (struct ifreq *)((char *)ibuf + ifc.ifc_len); 174 175 al = ifaddrlist; 176 mp = NULL; 177 nipaddr = 0; 178 for (; ifrp < ifend; ifrp = ifnext) { 179 #ifdef HAVE_SOCKADDR_SA_LEN 180 n = ifrp->ifr_addr.sa_len + sizeof(ifrp->ifr_name); 181 if (n < sizeof(*ifrp)) 182 ifnext = ifrp + 1; 183 else 184 ifnext = (struct ifreq *)((char *)ifrp + n); 185 if (ifrp->ifr_addr.sa_family != AF_INET) 186 continue; 187 #else 188 ifnext = ifrp + 1; 189 #endif 190 /* 191 * Need a template to preserve address info that is 192 * used below to locate the next entry. (Otherwise, 193 * SIOCGIFFLAGS stomps over it because the requests 194 * are returned in a union.) 195 */ 196 strncpy(ifr.ifr_name, ifrp->ifr_name, sizeof(ifr.ifr_name)); 197 if (ioctl(fd, SIOCGIFFLAGS, (char *)&ifr) < 0) { 198 if (errno == ENXIO) 199 continue; 200 (void)snprintf(errbuf, buflen, "SIOCGIFFLAGS: %.*s: %s", 201 (int)sizeof(ifr.ifr_name), ifr.ifr_name, 202 strerror(errno)); 203 (void)close(fd); 204 return (-1); 205 } 206 207 /* Must be up */ 208 if ((ifr.ifr_flags & IFF_UP) == 0) 209 continue; 210 211 /* 212 * Must not be a loopback address (127/8) 213 */ 214 sin = (struct sockaddr_in *)&ifrp->ifr_addr; 215 if (ISLOOPBACK(&ifr)) 216 if (ntohl(sin->sin_addr.s_addr) == INADDR_LOOPBACK) 217 continue; 218 219 (void)strncpy(device, ifrp->ifr_name, sizeof(ifrp->ifr_name)); 220 device[sizeof(device) - 1] = '\0'; 221 222 al->addr = sin->sin_addr.s_addr; 223 al->device = savestr(device); 224 ++al; 225 ++nipaddr; 226 } 227 (void)close(fd); 228 229 *ipaddrp = ifaddrlist; 230 return (nipaddr); 231 #endif 232 } 233