ifaddrlist.c revision 1.6
1 /* $NetBSD: ifaddrlist.c,v 1.6 2003/05/15 14:34:39 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 1.6 2003/05/15 14:34:39 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 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 80 81 /* Not all systems have IFF_LOOPBACK */ 82 #ifdef HAVE_IFADDRS_H 83 #ifdef IFF_LOOPBACK 84 #define ISLOOPBACK(p) ((p)->ifa_flags & IFF_LOOPBACK) 85 #else 86 #define ISLOOPBACK(p) (strcmp((p)->ifa_name, "lo0") == 0) 87 #endif 88 #else 89 #ifdef IFF_LOOPBACK 90 #define ISLOOPBACK(p) ((p)->ifr_flags & IFF_LOOPBACK) 91 #else 92 #define ISLOOPBACK(p) (strcmp((p)->ifr_name, "lo0") == 0) 93 #endif 94 #endif 95 96 #define MAX_IPADDR 256 97 98 /* 99 * Return the interface list 100 */ 101 int 102 ifaddrlist(struct ifaddrlist **ipaddrp, char *errbuf, int buflen) 103 { 104 #ifdef HAVE_IFADDRS_H 105 int nipaddr; 106 struct sockaddr_in *sin; 107 struct ifaddrs *ifap, *ifa; 108 struct ifaddrlist *al; 109 static struct ifaddrlist ifaddrlist[MAX_IPADDR]; 110 111 al = ifaddrlist; 112 nipaddr = 0; 113 114 if (getifaddrs(&ifap) != 0) { 115 (void)snprintf(errbuf, buflen, "getifaddrs: %s", 116 strerror(errno)); 117 return (-1); 118 } 119 120 for (ifa = ifap; ifa; ifa = ifa->ifa_next) { 121 if (ifa->ifa_addr->sa_family != AF_INET) 122 continue; 123 124 /* Must be up */ 125 if ((ifa->ifa_flags & IFF_UP) == 0) 126 continue; 127 128 /* 129 * Must not be a loopback address (127/8) 130 */ 131 sin = (struct sockaddr_in *)ifa->ifa_addr; 132 if (ISLOOPBACK(ifa)) 133 if (ntohl(sin->sin_addr.s_addr) == INADDR_LOOPBACK) 134 continue; 135 136 al->addr = sin->sin_addr.s_addr; 137 al->device = strdup(ifa->ifa_name); 138 ++al; 139 ++nipaddr; 140 } 141 *ipaddrp = ifaddrlist; 142 freeifaddrs(ifap); 143 return (nipaddr); 144 #else 145 int fd, nipaddr; 146 #ifdef HAVE_SOCKADDR_SA_LEN 147 int n; 148 #endif 149 struct ifreq *ifrp, *ifend, *ifnext, *mp; 150 struct sockaddr_in *sin; 151 struct ifaddrlist *al; 152 struct ifconf ifc; 153 struct ifreq ibuf[MAX_IPADDR], ifr; 154 char device[sizeof(ifr.ifr_name) + 1]; 155 static struct ifaddrlist ifaddrlist[MAX_IPADDR]; 156 157 fd = socket(AF_INET, SOCK_DGRAM, 0); 158 if (fd < 0) { 159 (void)snprintf(errbuf, buflen, "socket: %s", strerror(errno)); 160 return (-1); 161 } 162 ifc.ifc_len = sizeof(ibuf); 163 ifc.ifc_buf = (caddr_t)ibuf; 164 165 if (ioctl(fd, SIOCGIFCONF, (char *)&ifc) < 0 || 166 ifc.ifc_len < sizeof(struct ifreq)) { 167 (void)snprintf(errbuf, buflen, "SIOCGIFCONF: %s", strerror(errno)); 168 (void)close(fd); 169 return (-1); 170 } 171 ifrp = ibuf; 172 ifend = (struct ifreq *)((char *)ibuf + ifc.ifc_len); 173 174 al = ifaddrlist; 175 mp = NULL; 176 nipaddr = 0; 177 for (; ifrp < ifend; ifrp = ifnext) { 178 #ifdef HAVE_SOCKADDR_SA_LEN 179 n = ifrp->ifr_addr.sa_len + sizeof(ifrp->ifr_name); 180 if (n < sizeof(*ifrp)) 181 ifnext = ifrp + 1; 182 else 183 ifnext = (struct ifreq *)((char *)ifrp + n); 184 if (ifrp->ifr_addr.sa_family != AF_INET) 185 continue; 186 #else 187 ifnext = ifrp + 1; 188 #endif 189 /* 190 * Need a template to preserve address info that is 191 * used below to locate the next entry. (Otherwise, 192 * SIOCGIFFLAGS stomps over it because the requests 193 * are returned in a union.) 194 */ 195 strncpy(ifr.ifr_name, ifrp->ifr_name, sizeof(ifr.ifr_name)); 196 if (ioctl(fd, SIOCGIFFLAGS, (char *)&ifr) < 0) { 197 if (errno == ENXIO) 198 continue; 199 (void)snprintf(errbuf, buflen, "SIOCGIFFLAGS: %.*s: %s", 200 (int)sizeof(ifr.ifr_name), ifr.ifr_name, 201 strerror(errno)); 202 (void)close(fd); 203 return (-1); 204 } 205 206 /* Must be up */ 207 if ((ifr.ifr_flags & IFF_UP) == 0) 208 continue; 209 210 /* 211 * Must not be a loopback address (127/8) 212 */ 213 sin = (struct sockaddr_in *)&ifrp->ifr_addr; 214 if (ISLOOPBACK(&ifr)) 215 if (ntohl(sin->sin_addr.s_addr) == INADDR_LOOPBACK) 216 continue; 217 218 (void)strncpy(device, ifrp->ifr_name, sizeof(ifrp->ifr_name)); 219 device[sizeof(device) - 1] = '\0'; 220 221 al->addr = sin->sin_addr.s_addr; 222 al->device = strdup(device); 223 ++al; 224 ++nipaddr; 225 } 226 (void)close(fd); 227 228 *ipaddrp = ifaddrlist; 229 return (nipaddr); 230 #endif 231 } 232
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