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 #include <sys/param.h> 35 #include <sys/file.h> 36 #include <sys/ioctl.h> 37 #include <sys/socket.h> 38 #include <sys/sockio.h> 39 #include <sys/time.h> /* concession to AIX */ 40 41 #if __STDC__ 42 struct mbuf; 43 struct rtentry; 44 #endif 45 46 #include <net/if.h> 47 #include <netinet/in.h> 48 49 #include <ctype.h> 50 #include <errno.h> 51 #include <memory.h> 52 #include <stdio.h> 53 #include <stdlib.h> 54 #include <string.h> 55 #include <unistd.h> 56 57 #include "ifaddrlist.h" 58 59 /* 60 * Return the interface list 61 */ 62 int 63 ifaddrlist(register struct ifaddrlist **ipaddrp, register char *errbuf) 64 { 65 register int fd, nipaddr; 66 size_t n; 67 register struct ifreq *ifrp, *ifend, *ifnext; 68 register struct sockaddr_in *sin; 69 register struct ifaddrlist *al; 70 struct ifconf ifc; 71 struct ifreq ibuf[(32 * 1024) / sizeof(struct ifreq)], ifr; 72 #define MAX_IPADDR ((int)(sizeof(ibuf) / sizeof(ibuf[0]))) 73 static struct ifaddrlist ifaddrlist[MAX_IPADDR]; 74 char device[sizeof(ifr.ifr_name) + 1]; 75 76 fd = socket(AF_INET, SOCK_DGRAM, 0); 77 if (fd < 0) { 78 (void)sprintf(errbuf, "socket: %s", strerror(errno)); 79 return (-1); 80 } 81 ifc.ifc_len = sizeof(ibuf); 82 ifc.ifc_buf = (caddr_t)ibuf; 83 84 if (ioctl(fd, SIOCGIFCONF, (char *)&ifc) < 0 || 85 ifc.ifc_len < (int)sizeof(struct ifreq)) { 86 if (errno == EINVAL) 87 (void)sprintf(errbuf, 88 "SIOCGIFCONF: ifreq struct too small (%zu bytes)", 89 sizeof(ibuf)); 90 else 91 (void)sprintf(errbuf, "SIOCGIFCONF: %s", 92 strerror(errno)); 93 (void)close(fd); 94 return (-1); 95 } 96 ifrp = ibuf; 97 ifend = (struct ifreq *)((char *)ibuf + ifc.ifc_len); 98 99 al = ifaddrlist; 100 nipaddr = 0; 101 for (; ifrp < ifend; ifrp = ifnext) { 102 n = ifrp->ifr_addr.sa_len + sizeof(ifrp->ifr_name); 103 if (n < sizeof(*ifrp)) 104 ifnext = ifrp + 1; 105 else 106 ifnext = (struct ifreq *)((char *)ifrp + n); 107 if (ifrp->ifr_addr.sa_family != AF_INET) 108 continue; 109 /* 110 * Need a template to preserve address info that is 111 * used below to locate the next entry. (Otherwise, 112 * SIOCGIFFLAGS stomps over it because the requests 113 * are returned in a union.) 114 */ 115 strncpy(ifr.ifr_name, ifrp->ifr_name, sizeof(ifr.ifr_name)); 116 if (ioctl(fd, SIOCGIFFLAGS, (char *)&ifr) < 0) { 117 if (errno == ENXIO) 118 continue; 119 (void)sprintf(errbuf, "SIOCGIFFLAGS: %.*s: %s", 120 (int)sizeof(ifr.ifr_name), ifr.ifr_name, 121 strerror(errno)); 122 (void)close(fd); 123 return (-1); 124 } 125 126 /* Must be up */ 127 if ((ifr.ifr_flags & IFF_UP) == 0) 128 continue; 129 130 131 (void)strlcpy(device, ifr.ifr_name, sizeof(device)); 132 #ifdef sun 133 /* Ignore sun virtual interfaces */ 134 if (strchr(device, ':') != NULL) 135 continue; 136 #endif 137 if (ioctl(fd, SIOCGIFADDR, (char *)&ifr) < 0) { 138 (void)sprintf(errbuf, "SIOCGIFADDR: %s: %s", 139 device, strerror(errno)); 140 (void)close(fd); 141 return (-1); 142 } 143 144 if (nipaddr >= MAX_IPADDR) { 145 (void)sprintf(errbuf, "Too many interfaces (%d)", 146 MAX_IPADDR); 147 (void)close(fd); 148 return (-1); 149 } 150 sin = (struct sockaddr_in *)&ifr.ifr_addr; 151 al->addr = sin->sin_addr.s_addr; 152 al->device = strdup(device); 153 ++al; 154 ++nipaddr; 155 } 156 (void)close(fd); 157 158 *ipaddrp = ifaddrlist; 159 return (nipaddr); 160 } 161