1 /* $NetBSD: ifaddrlist.c,v 1.9 2011/05/11 00:38:28 christos 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 1.9 2011/05/11 00:38:28 christos 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 /* 86 * Return the interface list 87 */ 88 ssize_t 89 ifaddrlist(struct ifaddrlist **ipaddrp, char *errbuf, size_t buflen) 90 { 91 struct sockaddr_in *sin; 92 struct ifaddrs *ifap = NULL, *ifa; 93 struct ifaddrlist *al = NULL, *nal; 94 size_t i = 0, maxal = 10; 95 96 if (getifaddrs(&ifap) != 0) 97 goto out; 98 99 if ((al = malloc(maxal * sizeof(*al))) == NULL) 100 goto out; 101 102 for (ifa = ifap; ifa; ifa = ifa->ifa_next) { 103 if (ifa->ifa_addr->sa_family != AF_INET) 104 continue; 105 106 /* Must be up */ 107 if ((ifa->ifa_flags & IFF_UP) == 0) 108 continue; 109 110 /* 111 * Must not be a loopback address (127/8) 112 */ 113 sin = (struct sockaddr_in *)ifa->ifa_addr; 114 if (ISLOOPBACK(ifa)) 115 if (ntohl(sin->sin_addr.s_addr) == INADDR_LOOPBACK) 116 continue; 117 118 if (i == maxal) { 119 maxal <<= 1; 120 if ((nal = realloc(al, maxal * sizeof(*al))) == NULL) 121 goto out; 122 al = nal; 123 } 124 125 al[i].addr = sin->sin_addr.s_addr; 126 if ((al[i].device = strdup(ifa->ifa_name)) == NULL) 127 goto out; 128 i++; 129 } 130 if ((nal = realloc(al, i * sizeof(*al))) == NULL) 131 goto out; 132 freeifaddrs(ifap); 133 *ipaddrp = nal; 134 return (ssize_t)i; 135 out: 136 if (ifap) 137 freeifaddrs(ifap); 138 if (al) { 139 while (i > 0) 140 free(al[--i].device); 141 free(al); 142 } 143 (void)snprintf(errbuf, buflen, "%s: %s", __func__, strerror(errno)); 144 return -1; 145 } 146