1 /* 2 * Copyright (c) 1997, 1998, 1999, 2000 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the Computer Systems 16 * Engineering Group at Lawrence Berkeley Laboratory. 17 * 4. Neither the name of the University nor of the Laboratory may be used 18 * to endorse or promote products derived from this software without 19 * specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #ifndef lint 35 static const char rcsid[] = 36 "@(#) $Id: ifaddrlist.c,v 1.9 2000/11/23 20:01:55 leres Exp $ (LBL)"; 37 #endif 38 39 #include <sys/param.h> 40 #include <sys/ioctl.h> 41 #include <sys/socket.h> 42 #ifdef HAVE_SYS_SOCKIO_H 43 #include <sys/sockio.h> 44 #endif 45 #include <sys/time.h> /* concession to AIX */ 46 47 #include <sys/sockio.h> /* for SIOCGIFCONF */ 48 49 #if __STDC__ 50 struct mbuf; 51 struct rtentry; 52 #endif 53 54 #include <net/if.h> 55 #include <netinet/in.h> 56 57 #include <ctype.h> 58 #include <errno.h> 59 #include <memory.h> 60 #include <stdio.h> 61 #include <stdlib.h> 62 #include <string.h> 63 #include <unistd.h> 64 65 #include "gnuc.h" 66 #ifdef HAVE_OS_PROTO_H 67 #include "os-proto.h" 68 #endif 69 70 #include "ifaddrlist.h" 71 72 /* 73 * Return the interface list 74 */ 75 int 76 ifaddrlist(register struct ifaddrlist **ipaddrp, register char *errbuf) 77 { 78 register int fd, nipaddr; 79 #ifdef HAVE_SOCKADDR_SA_LEN 80 register int n; 81 #endif 82 register struct ifreq *ifrp, *ifend, *ifnext, *mp; 83 register struct sockaddr_in *sin; 84 register struct ifaddrlist *al; 85 struct ifconf ifc; 86 struct ifreq ibuf[(32 * 1024) / sizeof(struct ifreq)], ifr; 87 #define MAX_IPADDR (sizeof(ibuf) / sizeof(ibuf[0])) 88 static struct ifaddrlist ifaddrlist[MAX_IPADDR]; 89 char device[sizeof(ifr.ifr_name) + 1]; 90 91 fd = socket(AF_INET, SOCK_DGRAM, 0); 92 if (fd < 0) { 93 (void)sprintf(errbuf, "socket: %s", strerror(errno)); 94 return (-1); 95 } 96 ifc.ifc_len = sizeof(ibuf); 97 ifc.ifc_buf = (caddr_t)ibuf; 98 99 if (ioctl(fd, SIOCGIFCONF, (char *)&ifc) < 0) { 100 if (errno == EINVAL) 101 (void)sprintf(errbuf, 102 "SIOCGIFCONF: ifreq struct too small (%d bytes)", 103 sizeof(ibuf)); 104 else 105 (void)sprintf(errbuf, "SIOCGIFCONF: %s", 106 strerror(errno)); 107 (void)close(fd); 108 return (-1); 109 } 110 ifrp = ibuf; 111 ifend = (struct ifreq *)((char *)ibuf + ifc.ifc_len); 112 113 al = ifaddrlist; 114 mp = NULL; 115 nipaddr = 0; 116 for (; ifrp < ifend; ifrp = ifnext) { 117 #ifdef HAVE_SOCKADDR_SA_LEN 118 n = _SIZEOF_ADDR_IFREQ(*ifrp); 119 /* 120 * our ifreqs from SIOCGIFCONF dumps are very packed 121 */ 122 ifnext = (struct ifreq *)((char *)ifrp + n); 123 if (ifrp->ifr_addr.sa_family != AF_INET) 124 continue; 125 #else 126 ifnext = ifrp + 1; 127 #endif 128 /* 129 * Need a template to preserve address info that is 130 * used below to locate the next entry. (Otherwise, 131 * SIOCGIFFLAGS stomps over it because the requests 132 * are returned in a union.) 133 */ 134 strncpy(ifr.ifr_name, ifrp->ifr_name, sizeof(ifr.ifr_name)); 135 if (ioctl(fd, SIOCGIFFLAGS, (char *)&ifr, sizeof(ifr)) < 0) { 136 if (errno == ENXIO) 137 continue; 138 (void)sprintf(errbuf, "SIOCGIFFLAGS: %.*s: %s", 139 (int)sizeof(ifr.ifr_name), ifr.ifr_name, 140 strerror(errno)); 141 (void)close(fd); 142 return (-1); 143 } 144 145 /* Must be up */ 146 if ((ifr.ifr_flags & IFF_UP) == 0) 147 continue; 148 149 /* don't use loopback */ 150 if ((ifr.ifr_flags & IFF_LOOPBACK) != 0) 151 continue; 152 153 (void)strncpy(device, ifr.ifr_name, sizeof(ifr.ifr_name)); 154 device[sizeof(device) - 1] = '\0'; 155 #ifdef sun 156 /* Ignore sun virtual interfaces */ 157 if (strchr(device, ':') != NULL) 158 continue; 159 #endif 160 if (ioctl(fd, SIOCGIFADDR, (char *)&ifr, sizeof(ifr)) < 0) { 161 (void)sprintf(errbuf, "SIOCGIFADDR: %s: %s", 162 device, strerror(errno)); 163 (void)close(fd); 164 return (-1); 165 } 166 167 if (nipaddr >= MAX_IPADDR) { 168 (void)sprintf(errbuf, "Too many interfaces (%d)", 169 MAX_IPADDR); 170 (void)close(fd); 171 return (-1); 172 } 173 sin = (struct sockaddr_in *)&ifr.ifr_addr; 174 al->addr = sin->sin_addr.s_addr; 175 al->device = strdup(device); 176 ++al; 177 ++nipaddr; 178 } 179 (void)close(fd); 180 181 *ipaddrp = ifaddrlist; 182 return (nipaddr); 183 } 184