/* $NetBSD: ifaddrlist.c,v 1.4 2000/04/13 07:53:29 itojun Exp $ */ /* * Copyright (c) 1997 * 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. */ #include #ifndef lint #if 0 static const char rcsid[] = "@(#) Header: ifaddrlist.c,v 1.2 97/04/22 13:31:05 leres Exp (LBL)"; #else __RCSID("$NetBSD: ifaddrlist.c,v 1.4 2000/04/13 07:53:29 itojun Exp $"); #endif #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 #ifdef HAVE_IFADDRS_H #include #endif #include "gnuc.h" #ifdef HAVE_OS_PROTO_H #include "os-proto.h" #endif #include "ifaddrlist.h" #include "savestr.h" /* Not all systems have IFF_LOOPBACK */ #ifdef HAVE_IFADDRS_H #ifdef IFF_LOOPBACK #define ISLOOPBACK(p) ((p)->ifa_flags & IFF_LOOPBACK) #else #define ISLOOPBACK(p) (strcmp((p)->ifa_name, "lo0") == 0) #endif #else #ifdef IFF_LOOPBACK #define ISLOOPBACK(p) ((p)->ifr_flags & IFF_LOOPBACK) #else #define ISLOOPBACK(p) (strcmp((p)->ifr_name, "lo0") == 0) #endif #endif #define MAX_IPADDR 256 /* * Return the interface list */ int ifaddrlist(struct ifaddrlist **ipaddrp, char *errbuf, int buflen) { #ifdef HAVE_IFADDRS_H int nipaddr; struct sockaddr_in *sin; struct ifaddrs *ifap, *ifa; struct ifaddrlist *al; static struct ifaddrlist ifaddrlist[MAX_IPADDR]; al = ifaddrlist; nipaddr = 0; if (getifaddrs(&ifap) != 0) { (void)snprintf(errbuf, buflen, "getifaddrs: %s", strerror(errno)); return (-1); } for (ifa = ifap; ifa; ifa = ifa->ifa_next) { if (ifa->ifa_addr->sa_family != AF_INET) continue; /* Must be up */ if ((ifa->ifa_flags & IFF_UP) == 0) continue; /* * Must not be a loopback address (127/8) */ sin = (struct sockaddr_in *)ifa->ifa_addr; if (ISLOOPBACK(ifa)) if (ntohl(sin->sin_addr.s_addr) == INADDR_LOOPBACK) continue; al->addr = sin->sin_addr.s_addr; al->device = savestr(ifa->ifa_name); ++al; ++nipaddr; } *ipaddrp = ifaddrlist; freeifaddrs(ifap); return (nipaddr); #else int fd, nipaddr; #ifdef HAVE_SOCKADDR_SA_LEN int n; #endif struct ifreq *ifrp, *ifend, *ifnext, *mp; struct sockaddr_in *sin; struct ifaddrlist *al; struct ifconf ifc; struct ifreq ibuf[MAX_IPADDR], ifr; char device[sizeof(ifr.ifr_name) + 1]; static struct ifaddrlist ifaddrlist[MAX_IPADDR]; fd = socket(AF_INET, SOCK_DGRAM, 0); if (fd < 0) { (void)snprintf(errbuf, buflen, "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)) { (void)snprintf(errbuf, buflen, "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)snprintf(errbuf, buflen, "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; /* * Must not be a loopback address (127/8) */ sin = (struct sockaddr_in *)&ifrp->ifr_addr; if (ISLOOPBACK(&ifr)) if (ntohl(sin->sin_addr.s_addr) == INADDR_LOOPBACK) continue; (void)strncpy(device, ifrp->ifr_name, sizeof(ifrp->ifr_name)); device[sizeof(device) - 1] = '\0'; al->addr = sin->sin_addr.s_addr; al->device = savestr(device); ++al; ++nipaddr; } (void)close(fd); *ipaddrp = ifaddrlist; return (nipaddr); #endif }