ifaddrlist.c revision 1.1
1 /* $NetBSD: ifaddrlist.c,v 1.1 1997/10/03 22:25:12 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 1.1 1997/10/03 22:25:12 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 #if __STDC__ 56 struct mbuf; 57 struct rtentry; 58 #endif 59 60 #include <net/if.h> 61 #include <netinet/in.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 71 #include "gnuc.h" 72 #ifdef HAVE_OS_PROTO_H 73 #include "os-proto.h" 74 #endif 75 76 #include "ifaddrlist.h" 77 #include "savestr.h" 78 79 80 /* Not all systems have IFF_LOOPBACK */ 81 #ifdef IFF_LOOPBACK 82 #define ISLOOPBACK(p) ((p)->ifr_flags & IFF_LOOPBACK) 83 #else 84 #define ISLOOPBACK(p) (strcmp((p)->ifr_name, "lo0") == 0) 85 #endif 86 87 #define MAX_IPADDR 32 88 89 /* 90 * Return the interface list 91 */ 92 int 93 ifaddrlist(register struct ifaddrlist **ipaddrp, register char *errbuf) 94 { 95 register int fd, nipaddr; 96 #ifdef HAVE_SOCKADDR_SA_LEN 97 register int n; 98 #endif 99 register struct ifreq *ifrp, *ifend, *ifnext, *mp; 100 register struct sockaddr_in *sin; 101 register struct ifaddrlist *al; 102 struct ifconf ifc; 103 struct ifreq ibuf[MAX_IPADDR], ifr; 104 char device[sizeof(ifr.ifr_name) + 1]; 105 static struct ifaddrlist ifaddrlist[MAX_IPADDR]; 106 107 fd = socket(AF_INET, SOCK_DGRAM, 0); 108 if (fd < 0) { 109 (void)sprintf(errbuf, "socket: %s", strerror(errno)); 110 return (-1); 111 } 112 ifc.ifc_len = sizeof(ibuf); 113 ifc.ifc_buf = (caddr_t)ibuf; 114 115 if (ioctl(fd, SIOCGIFCONF, (char *)&ifc) < 0 || 116 ifc.ifc_len < sizeof(struct ifreq)) { 117 (void)sprintf(errbuf, "SIOCGIFCONF: %s", strerror(errno)); 118 (void)close(fd); 119 return (-1); 120 } 121 ifrp = ibuf; 122 ifend = (struct ifreq *)((char *)ibuf + ifc.ifc_len); 123 124 al = ifaddrlist; 125 mp = NULL; 126 nipaddr = 0; 127 for (; ifrp < ifend; ifrp = ifnext) { 128 #ifdef HAVE_SOCKADDR_SA_LEN 129 n = ifrp->ifr_addr.sa_len + sizeof(ifrp->ifr_name); 130 if (n < sizeof(*ifrp)) 131 ifnext = ifrp + 1; 132 else 133 ifnext = (struct ifreq *)((char *)ifrp + n); 134 if (ifrp->ifr_addr.sa_family != AF_INET) 135 continue; 136 #else 137 ifnext = ifrp + 1; 138 #endif 139 /* 140 * Need a template to preserve address info that is 141 * used below to locate the next entry. (Otherwise, 142 * SIOCGIFFLAGS stomps over it because the requests 143 * are returned in a union.) 144 */ 145 strncpy(ifr.ifr_name, ifrp->ifr_name, sizeof(ifr.ifr_name)); 146 if (ioctl(fd, SIOCGIFFLAGS, (char *)&ifr) < 0) { 147 if (errno == ENXIO) 148 continue; 149 (void)sprintf(errbuf, "SIOCGIFFLAGS: %.*s: %s", 150 (int)sizeof(ifr.ifr_name), ifr.ifr_name, 151 strerror(errno)); 152 (void)close(fd); 153 return (-1); 154 } 155 156 /* Must be up and not the loopback */ 157 if ((ifr.ifr_flags & IFF_UP) == 0 || ISLOOPBACK(&ifr)) 158 continue; 159 160 (void)strncpy(device, ifr.ifr_name, sizeof(ifr.ifr_name)); 161 device[sizeof(device) - 1] = '\0'; 162 if (ioctl(fd, SIOCGIFADDR, (char *)&ifr) < 0) { 163 (void)sprintf(errbuf, "SIOCGIFADDR: %s: %s", 164 device, strerror(errno)); 165 (void)close(fd); 166 return (-1); 167 } 168 169 sin = (struct sockaddr_in *)&ifr.ifr_addr; 170 al->addr = sin->sin_addr.s_addr; 171 al->device = savestr(device); 172 ++al; 173 ++nipaddr; 174 } 175 (void)close(fd); 176 177 *ipaddrp = ifaddrlist; 178 return (nipaddr); 179 } 180
Indexes created Wed Sep 24 15:09:51 GMT 2025