182 lines
5.1 KiB
C
182 lines
5.1 KiB
C
/* $NetBSD: ifaddrlist.c,v 1.3 1999/02/24 21:21:24 explorer Exp $ */
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/*
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* Copyright (c) 1997
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the Computer Systems
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* Engineering Group at Lawrence Berkeley Laboratory.
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* 4. Neither the name of the University nor of the Laboratory may be used
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* to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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#if 0
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static const char rcsid[] =
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"@(#) Header: ifaddrlist.c,v 1.2 97/04/22 13:31:05 leres Exp (LBL)";
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#else
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__RCSID("$NetBSD: ifaddrlist.c,v 1.3 1999/02/24 21:21:24 explorer Exp $");
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#endif
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#endif
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#include <sys/param.h>
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#include <sys/file.h>
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#include <sys/ioctl.h>
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#include <sys/socket.h>
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#ifdef HAVE_SYS_SOCKIO_H
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#include <sys/sockio.h>
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#endif
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#include <sys/time.h> /* concession to AIX */
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#if __STDC__
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struct mbuf;
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struct rtentry;
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#endif
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#include <net/if.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <ctype.h>
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#include <errno.h>
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#include <memory.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "gnuc.h"
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#ifdef HAVE_OS_PROTO_H
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#include "os-proto.h"
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#endif
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#include "ifaddrlist.h"
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#include "savestr.h"
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/* Not all systems have IFF_LOOPBACK */
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#ifdef IFF_LOOPBACK
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#define ISLOOPBACK(p) ((p)->ifr_flags & IFF_LOOPBACK)
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#else
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#define ISLOOPBACK(p) (strcmp((p)->ifr_name, "lo0") == 0)
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#endif
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#define MAX_IPADDR 256
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/*
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* Return the interface list
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*/
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int
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ifaddrlist(struct ifaddrlist **ipaddrp, char *errbuf, int buflen)
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{
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int fd, nipaddr;
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#ifdef HAVE_SOCKADDR_SA_LEN
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int n;
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#endif
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struct ifreq *ifrp, *ifend, *ifnext, *mp;
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struct sockaddr_in *sin;
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struct ifaddrlist *al;
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struct ifconf ifc;
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struct ifreq ibuf[MAX_IPADDR], ifr;
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char device[sizeof(ifr.ifr_name) + 1];
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static struct ifaddrlist ifaddrlist[MAX_IPADDR];
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fd = socket(AF_INET, SOCK_DGRAM, 0);
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if (fd < 0) {
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(void)snprintf(errbuf, buflen, "socket: %s", strerror(errno));
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return (-1);
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}
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ifc.ifc_len = sizeof(ibuf);
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ifc.ifc_buf = (caddr_t)ibuf;
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if (ioctl(fd, SIOCGIFCONF, (char *)&ifc) < 0 ||
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ifc.ifc_len < sizeof(struct ifreq)) {
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(void)snprintf(errbuf, buflen, "SIOCGIFCONF: %s", strerror(errno));
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(void)close(fd);
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return (-1);
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}
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ifrp = ibuf;
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ifend = (struct ifreq *)((char *)ibuf + ifc.ifc_len);
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al = ifaddrlist;
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mp = NULL;
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nipaddr = 0;
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for (; ifrp < ifend; ifrp = ifnext) {
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#ifdef HAVE_SOCKADDR_SA_LEN
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n = ifrp->ifr_addr.sa_len + sizeof(ifrp->ifr_name);
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if (n < sizeof(*ifrp))
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ifnext = ifrp + 1;
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else
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ifnext = (struct ifreq *)((char *)ifrp + n);
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if (ifrp->ifr_addr.sa_family != AF_INET)
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continue;
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#else
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ifnext = ifrp + 1;
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#endif
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/*
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* Need a template to preserve address info that is
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* used below to locate the next entry. (Otherwise,
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* SIOCGIFFLAGS stomps over it because the requests
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* are returned in a union.)
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*/
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strncpy(ifr.ifr_name, ifrp->ifr_name, sizeof(ifr.ifr_name));
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if (ioctl(fd, SIOCGIFFLAGS, (char *)&ifr) < 0) {
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if (errno == ENXIO)
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continue;
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(void)snprintf(errbuf, buflen, "SIOCGIFFLAGS: %.*s: %s",
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(int)sizeof(ifr.ifr_name), ifr.ifr_name,
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strerror(errno));
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(void)close(fd);
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return (-1);
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}
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/* Must be up */
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if ((ifr.ifr_flags & IFF_UP) == 0)
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continue;
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/*
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* Must not be a loopback address (127/8)
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*/
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sin = (struct sockaddr_in *)&ifrp->ifr_addr;
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if (ISLOOPBACK(&ifr))
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if (ntohl(sin->sin_addr.s_addr) == INADDR_LOOPBACK)
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continue;
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(void)strncpy(device, ifrp->ifr_name, sizeof(ifrp->ifr_name));
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device[sizeof(device) - 1] = '\0';
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al->addr = sin->sin_addr.s_addr;
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al->device = savestr(device);
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++al;
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++nipaddr;
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}
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(void)close(fd);
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*ipaddrp = ifaddrlist;
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return (nipaddr);
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}
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