/* * Copyright (c) 1997, 1998, 1999, 2000 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the Computer Systems * Engineering Group at Lawrence Berkeley Laboratory. * 4. Neither the name of the University nor of the Laboratory may be used * to endorse or promote products derived from this software without * specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #ifndef lint static const char rcsid[] = "@(#) $Id: ifaddrlist.c,v 1.2 2004/08/08 00:27:54 lindak Exp $ (LBL)"; #endif #include #include #include #include #ifdef HAVE_SYS_SOCKIO_H #include #endif #include /* concession to AIX */ #if __STDC__ struct mbuf; struct rtentry; #endif #include #include #include #include #include #include #include #include #include #include "gnuc.h" #ifdef HAVE_OS_PROTO_H #include "os-proto.h" #endif #include "ifaddrlist.h" /* * Return the interface list */ int ifaddrlist(register struct ifaddrlist **ipaddrp, register char *errbuf) { register int fd, nipaddr; #ifdef HAVE_SOCKADDR_SA_LEN register int n; #endif register struct ifreq *ifrp, *ifend, *ifnext, *mp; register struct sockaddr_in *sin; register struct ifaddrlist *al; struct ifconf ifc; struct ifreq ibuf[(32 * 1024) / sizeof(struct ifreq)], ifr; #define MAX_IPADDR (sizeof(ibuf) / sizeof(ibuf[0])) static struct ifaddrlist ifaddrlist[MAX_IPADDR]; char device[sizeof(ifr.ifr_name) + 1]; fd = socket(AF_INET, SOCK_DGRAM, 0); if (fd < 0) { (void)sprintf(errbuf, "socket: %s", strerror(errno)); return (-1); } ifc.ifc_len = sizeof(ibuf); ifc.ifc_buf = (caddr_t)ibuf; if (ioctl(fd, SIOCGIFCONF, (char *)&ifc) < 0 || ifc.ifc_len < sizeof(struct ifreq)) { if (errno == EINVAL) (void)sprintf(errbuf, "SIOCGIFCONF: ifreq struct too small (%d bytes)", sizeof(ibuf)); else (void)sprintf(errbuf, "SIOCGIFCONF: %s", strerror(errno)); (void)close(fd); return (-1); } ifrp = ibuf; ifend = (struct ifreq *)((char *)ibuf + ifc.ifc_len); al = ifaddrlist; mp = NULL; nipaddr = 0; for (; ifrp < ifend; ifrp = ifnext) { #ifdef HAVE_SOCKADDR_SA_LEN n = ifrp->ifr_addr.sa_len + sizeof(ifrp->ifr_name); if (n < sizeof(*ifrp)) ifnext = ifrp + 1; else ifnext = (struct ifreq *)((char *)ifrp + n); if (ifrp->ifr_addr.sa_family != AF_INET) continue; #else ifnext = ifrp + 1; #endif /* * Need a template to preserve address info that is * used below to locate the next entry. (Otherwise, * SIOCGIFFLAGS stomps over it because the requests * are returned in a union.) */ strncpy(ifr.ifr_name, ifrp->ifr_name, sizeof(ifr.ifr_name)); if (ioctl(fd, SIOCGIFFLAGS, (char *)&ifr) < 0) { if (errno == ENXIO) continue; (void)sprintf(errbuf, "SIOCGIFFLAGS: %.*s: %s", (int)sizeof(ifr.ifr_name), ifr.ifr_name, strerror(errno)); (void)close(fd); return (-1); } /* Must be up */ if ((ifr.ifr_flags & IFF_UP) == 0) continue; (void)strncpy(device, ifr.ifr_name, sizeof(ifr.ifr_name)); device[sizeof(device) - 1] = '\0'; #ifdef sun /* Ignore sun virtual interfaces */ if (strchr(device, ':') != NULL) continue; #endif if (ioctl(fd, SIOCGIFADDR, (char *)&ifr) < 0) { (void)sprintf(errbuf, "SIOCGIFADDR: %s: %s", device, strerror(errno)); (void)close(fd); return (-1); } if (nipaddr >= MAX_IPADDR) { (void)sprintf(errbuf, "Too many interfaces (%d)", MAX_IPADDR); (void)close(fd); return (-1); } sin = (struct sockaddr_in *)&ifr.ifr_addr; al->addr = sin->sin_addr.s_addr; al->device = strdup(device); ++al; ++nipaddr; } (void)close(fd); *ipaddrp = ifaddrlist; return (nipaddr); }