delarp.c
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上传日期:2007-01-17
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文件大小:3k
- /* delarp.c - DHCP server ARP deletion code */
- /* Copyright 1984 - 2001 Wind River Systems, Inc. */
- #include "copyright_wrs.h"
- /*
- modification history
- --------------------
- 01b,09oct01,vvv fixed mod hist
- 01a,07apr97,spm created by modifying WIDE project DHCP implementation
- */
- /*
- DESCRIPTION
- This library contains the code used by the DHCP server to remove
- entries from the ARP cache for offered network addresses. This
- allows accurate ICMP checks by the server to determine if the address
- is in use.
- INCLUDE_FILES: None
- */
- /*
- * Modified by Akihiro Tominaga (tomy@sfc.wide.ad.jp)
- */
- /*
- * Copyright (c) 1984, 1993
- * The Regents of the University of California. All rights reserved.
- *
- * This code is derived from software contributed to Berkeley by
- * Sun Microsystems, Inc.
- *
- * 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 University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * 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 <sys/socket.h>
- #include <sys/ioctl.h>
- #include <net/if.h>
- #include <net/route.h>
- #include <netinet/in.h>
- #include <netinet/if_ether.h>
- #include <unistd.h>
- #include <string.h>
- #include "ioLib.h" /* ioctl() declaration */
- #include "logLib.h"
- #include "sockLib.h"
- #include "taskLib.h"
- /*******************************************************************************
- *
- * delarp - delete an ARP entry
- *
- * This routine deletes the ARP entry associated with the given IP address
- * prior to checking its availability by issuing an ICMP request.
- *
- * RETURNS: N/A
- *
- * ERRNO: N/A
- *
- * NOMANUAL
- */
- void delarp
- (
- struct in_addr *target,
- int sockfd
- )
- {
- struct arpreq arq;
- struct sockaddr_in *sin = NULL;
- bzero ( (char *)&arq, sizeof (arq));
- arq.arp_pa.sa_family = AF_INET;
- sin = (struct sockaddr_in *)&arq.arp_pa;
- sin->sin_family = AF_INET;
- sin->sin_addr.s_addr = target->s_addr;
- ioctl (sockfd, SIOCDARP, (int)&arq);
- return;
- }