1 /* $NetBSD: ifaddrlist.c,v 1.7 2003/05/15 14:47:49 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 1.7 2003/05/15 14:47:49 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 #include <ifaddrs.h> 70 71 #include "gnuc.h" 72 #ifdef HAVE_OS_PROTO_H 73 #include "os-proto.h" 74 #endif 75 76 #include "ifaddrlist.h" 77 78 /* Not all systems have IFF_LOOPBACK */ 79 #ifdef IFF_LOOPBACK 80 #define ISLOOPBACK(p) ((p)->ifa_flags & IFF_LOOPBACK) 81 #else 82 #define ISLOOPBACK(p) (strcmp((p)->ifa_name, "lo0") == 0) 83 #endif 84 85 #define MAX_IPADDR 256 86 87 /* 88 * Return the interface list 89 */ 90 int 91 ifaddrlist(struct ifaddrlist **ipaddrp, char *errbuf, int buflen) 92 { 93 int nipaddr; 94 struct sockaddr_in *sin; 95 struct ifaddrs *ifap, *ifa; 96 struct ifaddrlist *al; 97 static struct ifaddrlist ifaddrlist[MAX_IPADDR]; 98 99 al = ifaddrlist; 100 nipaddr = 0; 101 102 if (getifaddrs(&ifap) != 0) { 103 (void)snprintf(errbuf, buflen, "getifaddrs: %s", 104 strerror(errno)); 105 return (-1); 106 } 107 108 for (ifa = ifap; ifa; ifa = ifa->ifa_next) { 109 if (ifa->ifa_addr->sa_family != AF_INET) 110 continue; 111 112 /* Must be up */ 113 if ((ifa->ifa_flags & IFF_UP) == 0) 114 continue; 115 116 /* 117 * Must not be a loopback address (127/8) 118 */ 119 sin = (struct sockaddr_in *)ifa->ifa_addr; 120 if (ISLOOPBACK(ifa)) 121 if (ntohl(sin->sin_addr.s_addr) == INADDR_LOOPBACK) 122 continue; 123 124 al->addr = sin->sin_addr.s_addr; 125 al->device = strdup(ifa->ifa_name); 126 ++al; 127 ++nipaddr; 128 } 129 *ipaddrp = ifaddrlist; 130 freeifaddrs(ifap); 131 return (nipaddr); 132 } 133