flushroute.c
上传用户:nvosite88
上传日期:2007-01-17
资源大小:4983k
文件大小:6k
- /* flushroute.c - DHCP library routing table access */
- /* Copyright 1984 - 2001 Wind River Systems, Inc. */
- #include "copyright_wrs.h"
- /*
- modification history
- --------------------
- 01a,12oct01,rae made ______ -> ------ fix
- 01d,18apr97,spm added conditional include DHCPC_DEBUG for displayed output
- 01c,07apr97,spm code cleanup, modified comments
- 01b,27jan97,spm brought into compliance with Wind River coding standards
- 01a,03oct96,spm created by modifying WIDE Project DHCP Implementation
- */
- /*
- DESCRIPTION
- This library contains the code which clears the routing table for the
- Wide project DHCP client, modified for vxWorks compatibility.
- INCLUDE_FILES: None
- */
- /*
- * Copyright (c) 1983, 1989 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 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.
- */
- /*
- * Some part are modified by kei@cs.uec.ac.jp and tomy@sfc.wide.ad.jp.
- *
- */
- /* includes */
- #include "vxWorks.h"
- #include <stdio.h>
- #include <stdlib.h>
- #include <sys/types.h>
- #include <sockLib.h>
- #include <ioLib.h>
- #include <sys/ioctl.h>
- #include <net/mbuf.h>
- #include <net/route.h>
- #include <netinet/in.h>
- #include <rpc/types.h>
- /*******************************************************************************
- *
- * flushroutes - clean the network routing table
- *
- * This routine removes all entries except the loopback entry from the routing
- * table for the network interface. Two variations are provided. The first
- * uses the routing table as defined in the BSD 4.3 protocol stack and
- * the second uses the BSD 4.4 protocol stack.
- *
- * RETURNS: 0 if successful, or -1 on error.
- *
- * ERRNO: N/A
- *
- * NOMANUAL
- */
- #if BSD < 44
- int flushroutes (void)
- {
- int s = 0;
- struct mbuf mb;
- register struct rtentry *rt = NULL;
- register struct mbuf *m = NULL;
- int rthashsize = 0, i = 0, status = 0;
- bzero ( (char *)&mb, sizeof (mb));
- if ( (s = socket(AF_INET, SOCK_RAW, 0)) < 0)
- return(-1);
- rthashsize = RTHASHSIZ;
- /* Remove all host routing entries. */
- for (i = 0; i < rthashsize; i++)
- for (m = rthost[i]; m != NULL; m = m->m_next)
- {
- rt = mtod (m, struct rtentry *);
- if ( ( (struct sockaddr_in *)&rt->rt_dst)->sin_addr.s_addr !=
- INADDR_LOOPBACK)
- status = ioctl(s, SIOCDELRT, (int)(caddr_t)rt);
- }
- for (i = 0; i < rthashsize; i++)
- for (m = rtnet[i]; m != NULL; m = m->m_next)
- {
- rt = mtod (m, struct rtentry *);
- if ( ( (struct sockaddr_in *)&rt->rt_dst)->sin_addr.s_addr !=
- INADDR_LOOPBACK)
- status = ioctl(s, SIOCDELRT, (int)(caddr_t)rt);
- }
- /* The WIDE implementation ignores the IOCTL results, so we do too. */
- close (s);
- return (0);
- }
- #else
- /* externals */
- IMPORT int sysctl_rtable(int *, int, caddr_t, size_t *, caddr_t *, size_t);
- int flushroutes (void)
- {
- int s;
- size_t needed;
- int mib[3], rlen, seqno;
- char *buf, *next, *lim;
- register struct rt_msghdr *rtm;
- if ( (s = socket (PF_ROUTE, SOCK_RAW, 0)) < 0)
- {
- #ifdef DHCPC_DEBUG
- printf ("Warning: socket() error in flushroutes()");
- #endif
- return (-1);
- }
- shutdown(s, 0);
- mib[0] = AF_INET;
- mib[1] = NET_RT_DUMP;
- mib[2] = 0; /* no flags */
- /* Retrieve the size of the routing table and allocate needed memory. */
- if (sysctl_rtable (mib, 3, NULL, &needed, NULL, 0) < 0)
- {
- #ifdef DHCPC_DEBUG
- printf ("Warning: sysctl() error in flushroutes()");
- #endif
- close (s);
- return (-1);
- }
- if ( (buf = calloc(1, needed)) == NULL)
- {
- #ifdef DHCPC_DEBUG
- printf ("Warning: calloc() error in flushroutes()");
- #endif
- close (s);
- return(-1);
- }
- /* Copy the current routing table to the allocated buffer. */
- if (sysctl_rtable(mib, 3, buf, &needed, NULL, 0) < 0)
- {
- #ifdef DHCPC_DEBUG
- printf("Warning: sysctl() error in flushroutes()");
- #endif
- free(buf);
- close(s);
- return(-1);
- }
- lim = buf + needed;
- seqno = 0;
- /* Delete each route contained in the routing tables. */
- for (next = buf; next < lim; next += rtm->rtm_msglen)
- {
- rtm = (struct rt_msghdr *) next;
- if ((rtm->rtm_flags & (RTF_GATEWAY | RTF_LLINFO)) == 0)
- continue;
- rtm->rtm_type = RTM_DELETE;
- rtm->rtm_seq = seqno;
- rlen = write(s, next, rtm->rtm_msglen);
- if (rlen < (int)rtm->rtm_msglen)
- break;
- seqno++;
- }
- free(buf);
- close(s);
- return(0);
- }
- #endif /* BSD 4.4 version */