240 lines
6.1 KiB
C
240 lines
6.1 KiB
C
/*
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* Copyright (c) 1984, 1993
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* The Regents of the University of California. All rights reserved.
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* Copyright (c) 1994
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* Geoffrey M. Rehmet, All rights reserved.
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*
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* This code is derived from software which forms part of the 4.4-Lite
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* Berkeley software distribution, which was in derived from software
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* contributed to Berkeley by Sun Microsystems, Inc.
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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. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without 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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/*
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* from arp.c 8.2 (Berkeley) 1/2/94
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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/*
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* Verify that we are at least 4.4 BSD
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*/
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#if defined(BSD)
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#if BSD >= 199306
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#include <sys/socket.h>
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#include <sys/filio.h>
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#include <sys/time.h>
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#include <net/if.h>
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#include <net/if_dl.h>
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#include <net/if_types.h>
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#include <net/route.h>
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#include <netinet/in.h>
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#include <netinet/if_ether.h>
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#include <arpa/inet.h>
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#include <errno.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 <syslog.h>
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#include <unistd.h>
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#include "report.h"
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static int rtmsg(int);
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static int s = -1; /* routing socket */
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/*
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* Open the routing socket
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*/
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static void getsocket () {
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if (s < 0) {
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s = socket(PF_ROUTE, SOCK_RAW, 0);
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if (s < 0) {
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report(LOG_ERR, "socket %s", strerror(errno));
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exit(1);
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}
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} else {
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/*
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* Drain the socket of any unwanted routing messages.
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*/
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int n;
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char buf[512];
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ioctl(s, FIONREAD, &n);
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while (n > 0) {
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read(s, buf, sizeof buf);
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ioctl(s, FIONREAD, &n);
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}
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}
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}
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static struct sockaddr_in so_mask = {8, 0, 0, { 0xffffffff}};
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static struct sockaddr_in blank_sin = {sizeof(blank_sin), AF_INET }, sin_m;
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static struct sockaddr_dl blank_sdl = {sizeof(blank_sdl), AF_LINK }, sdl_m;
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static int expire_time, flags, doing_proxy;
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static struct {
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struct rt_msghdr m_rtm;
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char m_space[512];
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} m_rtmsg;
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/*
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* Set an individual arp entry
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*/
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int bsd_arp_set(ia, eaddr, len)
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struct in_addr *ia;
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char *eaddr;
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int len;
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{
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struct sockaddr_in *sin = &sin_m;
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struct sockaddr_dl *sdl;
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struct rt_msghdr *rtm = &(m_rtmsg.m_rtm);
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u_char *ea;
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struct timespec tp;
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int op = RTM_ADD;
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getsocket();
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sdl_m = blank_sdl;
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sin_m = blank_sin;
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sin->sin_addr = *ia;
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ea = (u_char *)LLADDR(&sdl_m);
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bcopy(eaddr, ea, len);
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sdl_m.sdl_alen = len;
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doing_proxy = flags = expire_time = 0;
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/* make arp entry temporary */
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clock_gettime(CLOCK_MONOTONIC, &tp);
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expire_time = tp.tv_sec + 20 * 60;
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tryagain:
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if (rtmsg(RTM_GET) < 0) {
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report(LOG_WARNING, "rtmget: %s", strerror(errno));
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return (1);
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}
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sin = (struct sockaddr_in *)(rtm + 1);
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sdl = (struct sockaddr_dl *)(sin->sin_len + (char *)sin);
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if (sin->sin_addr.s_addr == sin_m.sin_addr.s_addr) {
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if (sdl->sdl_family == AF_LINK &&
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!(rtm->rtm_flags & RTF_GATEWAY)) switch (sdl->sdl_type) {
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case IFT_ETHER: case IFT_FDDI: case IFT_ISO88023:
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case IFT_ISO88024: case IFT_ISO88025:
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op = RTM_CHANGE;
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goto overwrite;
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}
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if (doing_proxy == 0) {
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report(LOG_WARNING, "set: can only proxy for %s\n",
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inet_ntoa(sin->sin_addr));
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return (1);
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}
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goto tryagain;
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}
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overwrite:
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if (sdl->sdl_family != AF_LINK) {
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report(LOG_WARNING,
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"cannot intuit interface index and type for %s\n",
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inet_ntoa(sin->sin_addr));
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return (1);
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}
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sdl_m.sdl_type = sdl->sdl_type;
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sdl_m.sdl_index = sdl->sdl_index;
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return (rtmsg(op));
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}
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static int rtmsg(cmd)
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int cmd;
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{
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static int seq;
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int rlen;
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struct rt_msghdr *rtm = &m_rtmsg.m_rtm;
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char *cp = m_rtmsg.m_space;
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int l;
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errno = 0;
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bzero((char *)&m_rtmsg, sizeof(m_rtmsg));
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rtm->rtm_flags = flags;
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rtm->rtm_version = RTM_VERSION;
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switch (cmd) {
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default:
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report(LOG_ERR, "set_arp: internal wrong cmd - exiting");
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exit(1);
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case RTM_ADD:
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case RTM_CHANGE:
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rtm->rtm_addrs |= RTA_GATEWAY;
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rtm->rtm_rmx.rmx_expire = expire_time;
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rtm->rtm_inits = RTV_EXPIRE;
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rtm->rtm_flags |= (RTF_HOST | RTF_STATIC | RTF_LLDATA);
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if (doing_proxy) {
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rtm->rtm_addrs |= RTA_NETMASK;
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rtm->rtm_flags &= ~RTF_HOST;
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}
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/* FALLTHROUGH */
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case RTM_GET:
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rtm->rtm_addrs |= RTA_DST;
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}
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#define NEXTADDR(w, s) \
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if (rtm->rtm_addrs & (w)) { \
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bcopy((char *)&s, cp, sizeof(s)); cp += sizeof(s);}
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NEXTADDR(RTA_DST, sin_m);
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NEXTADDR(RTA_GATEWAY, sdl_m);
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NEXTADDR(RTA_NETMASK, so_mask);
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rtm->rtm_msglen = cp - (char *)&m_rtmsg;
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l = rtm->rtm_msglen;
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rtm->rtm_seq = ++seq;
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rtm->rtm_type = cmd;
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if ((rlen = write(s, (char *)&m_rtmsg, l)) < 0) {
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if ((errno != ESRCH) && !(errno == EEXIST && cmd == RTM_ADD)){
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report(LOG_WARNING, "writing to routing socket: %s",
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strerror(errno));
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return (-1);
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}
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}
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do {
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l = read(s, (char *)&m_rtmsg, sizeof(m_rtmsg));
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} while (l > 0 && (rtm->rtm_type != cmd || rtm->rtm_seq != seq || rtm->rtm_pid != getpid()));
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if (l < 0)
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report(LOG_WARNING, "arp: read from routing socket: %s\n",
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strerror(errno));
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return (0);
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}
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#endif /* BSD */
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#endif /* BSD >= 199306 */
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