1 /* $NetBSD: ifaddrlist.c,v 1.10 2011/09/11 01:06:26 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1997, 1998, 1999, 2000 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 "@(#) Id: ifaddrlist.c,v 1.9 2000/11/23 20:01:55 leres Exp (LBL)"; 42 #else 43 __RCSID("$NetBSD: ifaddrlist.c,v 1.10 2011/09/11 01:06:26 christos Exp $"); 44 #endif 45 #endif 46 47 #include <sys/param.h> 48 #include <sys/file.h> 49 #include <sys/ioctl.h> 50 #include <sys/socket.h> 51 #ifdef HAVE_SYS_SOCKIO_H 52 #include <sys/sockio.h> 53 #endif 54 #include <sys/time.h> /* concession to AIX */ 55 56 struct mbuf; 57 struct rtentry; 58 59 #include <net/if.h> 60 #include <netinet/in.h> 61 #include <arpa/inet.h> 62 63 #include <ctype.h> 64 #include <errno.h> 65 #include <memory.h> 66 #include <stdio.h> 67 #include <stdlib.h> 68 #include <string.h> 69 #include <unistd.h> 70 #include <ifaddrs.h> 71 72 #include "gnuc.h" 73 #ifdef HAVE_OS_PROTO_H 74 #include "os-proto.h" 75 #endif 76 77 #include "ifaddrlist.h" 78 79 /* Not all systems have IFF_LOOPBACK */ 80 #ifdef IFF_LOOPBACK 81 #define ISLOOPBACK(p) ((p)->ifa_flags & IFF_LOOPBACK) 82 #else 83 #define ISLOOPBACK(p) (strcmp((p)->ifa_name, "lo0") == 0) 84 #endif 85 86 /* 87 * Return the interface list 88 */ 89 ssize_t 90 ifaddrlist(struct ifaddrlist **ipaddrp, char *errbuf, size_t buflen) 91 { 92 struct sockaddr_in *sin; 93 struct ifaddrs *ifap = NULL, *ifa; 94 struct ifaddrlist *al = NULL, *nal; 95 size_t i = 0, maxal = 10; 96 97 if (getifaddrs(&ifap) != 0) 98 goto out; 99 100 if ((al = malloc(maxal * sizeof(*al))) == NULL) 101 goto out; 102 103 for (ifa = ifap; ifa; ifa = ifa->ifa_next) { 104 if (ifa->ifa_addr->sa_family != AF_INET) 105 continue; 106 107 /* Must be up */ 108 if ((ifa->ifa_flags & IFF_UP) == 0) 109 continue; 110 111 /* 112 * Must not be a loopback address (127/8) 113 */ 114 sin = (struct sockaddr_in *)ifa->ifa_addr; 115 if (ISLOOPBACK(ifa)) 116 if (ntohl(sin->sin_addr.s_addr) == INADDR_LOOPBACK) 117 continue; 118 119 if (i == maxal) { 120 maxal <<= 1; 121 if ((nal = realloc(al, maxal * sizeof(*al))) == NULL) 122 goto out; 123 al = nal; 124 } 125 126 al[i].addr = sin->sin_addr.s_addr; 127 if ((al[i].device = strdup(ifa->ifa_name)) == NULL) 128 goto out; 129 i++; 130 } 131 if ((nal = realloc(al, i * sizeof(*al))) == NULL) 132 goto out; 133 freeifaddrs(ifap); 134 *ipaddrp = nal; 135 return (ssize_t)i; 136 out: 137 if (ifap) 138 freeifaddrs(ifap); 139 if (al) { 140 while (i > 0) 141 free(al[--i].device); 142 free(al); 143 } 144 (void)snprintf(errbuf, buflen, "%s: %s", __func__, strerror(errno)); 145 return -1; 146 } 147