1 /* $NetBSD: ifaddrlist.c,v 1.11 2019/08/18 04:12:07 kamil 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 1.11 2019/08/18 04:12:07 kamil 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 #include "prog_ops.h" 79 80 /* Not all systems have IFF_LOOPBACK */ 81 #ifdef IFF_LOOPBACK 82 #define ISLOOPBACK(p) ((p)->ifa_flags & IFF_LOOPBACK) 83 #else 84 #define ISLOOPBACK(p) (strcmp((p)->ifa_name, "lo0") == 0) 85 #endif 86 87 /* 88 * Return the interface list 89 */ 90 ssize_t 91 ifaddrlist(struct ifaddrlist **ipaddrp, char *errbuf, size_t buflen) 92 { 93 struct sockaddr_in *sin; 94 struct ifaddrs *ifap = NULL, *ifa; 95 struct ifaddrlist *al = NULL, *nal; 96 size_t i = 0, maxal = 10; 97 98 if (prog_getifaddrs(&ifap) != 0) 99 goto out; 100 101 if ((al = malloc(maxal * sizeof(*al))) == NULL) 102 goto out; 103 104 for (ifa = ifap; ifa; ifa = ifa->ifa_next) { 105 if (ifa->ifa_addr->sa_family != AF_INET) 106 continue; 107 108 /* Must be up */ 109 if ((ifa->ifa_flags & IFF_UP) == 0) 110 continue; 111 112 /* 113 * Must not be a loopback address (127/8) 114 */ 115 sin = (struct sockaddr_in *)ifa->ifa_addr; 116 if (ISLOOPBACK(ifa)) 117 if (ntohl(sin->sin_addr.s_addr) == INADDR_LOOPBACK) 118 continue; 119 120 if (i == maxal) { 121 maxal <<= 1; 122 if ((nal = realloc(al, maxal * sizeof(*al))) == NULL) 123 goto out; 124 al = nal; 125 } 126 127 al[i].addr = sin->sin_addr.s_addr; 128 if ((al[i].device = strdup(ifa->ifa_name)) == NULL) 129 goto out; 130 i++; 131 } 132 if ((nal = realloc(al, i * sizeof(*al))) == NULL) 133 goto out; 134 freeifaddrs(ifap); 135 *ipaddrp = nal; 136 return (ssize_t)i; 137 out: 138 if (ifap) 139 freeifaddrs(ifap); 140 if (al) { 141 while (i > 0) 142 free(al[--i].device); 143 free(al); 144 } 145 (void)snprintf(errbuf, buflen, "%s: %s", __func__, strerror(errno)); 146 return -1; 147 } 148