--- /dev/null
+/*
+ * 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.
+ */
+
+#ifndef lint
+static char copyright[] =
+"@(#) Copyright (c) 1984, 1993\n\
+ The Regents of the University of California. All rights reserved.\n";
+#endif /* not lint */
+
+#ifndef lint
+static char sccsid[] = "@(#)arp.c 8.2 (Berkeley) 1/2/94";
+#endif /* not lint */
+
+/*
+ * set arp table entries
+ */
+
+
+#include <sys/param.h>
+#include <sys/file.h>
+#include <sys/socket.h>
+#include <sys/sysctl.h>
+
+#include <net/if.h>
+#include <net/if_dl.h>
+#include <net/if_types.h>
+#include <net/route.h>
+
+#include <netinet/in.h>
+#include <netinet/if_ether.h>
+
+#include <arpa/inet.h>
+
+#include <netdb.h>
+#include <errno.h>
+#include <nlist.h>
+#include <stdio.h>
+#include <paths.h>
+#include <syslog.h>
+
+extern int errno;
+static int pid;
+static int s = -1;
+
+getsocket() {
+ if (s < 0) {
+ s = socket(PF_ROUTE, SOCK_RAW, 0);
+ if (s < 0) {
+ perror("arp: socket");
+ exit(1);
+ }
+ }
+}
+
+struct sockaddr_in so_mask = {8, 0, 0, { 0xffffffff}};
+struct sockaddr_inarp blank_sin = {sizeof(blank_sin), AF_INET }, sin_m;
+struct sockaddr_dl blank_sdl = {sizeof(blank_sdl), AF_LINK }, sdl_m;
+int expire_time, flags, export_only, doing_proxy;
+struct {
+ struct rt_msghdr m_rtm;
+ char m_space[512];
+} m_rtmsg;
+
+/*
+ * Set an individual arp entry
+ */
+arptab_set(eaddr, host)
+ u_char *eaddr;
+ u_long host;
+{
+ register struct sockaddr_inarp *sin = &sin_m;
+ register struct sockaddr_dl *sdl;
+ register struct rt_msghdr *rtm = &(m_rtmsg.m_rtm);
+ struct timeval time;
+
+ getsocket();
+ pid = getpid();
+ sdl_m = blank_sdl;
+ sin_m = blank_sin;
+ sin->sin_addr.s_addr = host;
+ bcopy((char *)eaddr, (u_char *)LLADDR(&sdl_m), 6);
+ sdl_m.sdl_alen = 6;
+ doing_proxy = flags = export_only = expire_time = 0;
+ gettimeofday(&time, 0);
+ expire_time = time.tv_sec + 20 * 60;
+
+tryagain:
+ if (rtmsg(RTM_GET) < 0) {
+ syslog(LOG_ERR,"%s: %m", inet_ntoa(sin->sin_addr));
+ return (1);
+ }
+ sin = (struct sockaddr_inarp *)(rtm + 1);
+ sdl = (struct sockaddr_dl *)(sin->sin_len + (char *)sin);
+ if (sin->sin_addr.s_addr == sin_m.sin_addr.s_addr) {
+ if (sdl->sdl_family == AF_LINK &&
+ (rtm->rtm_flags & RTF_LLINFO) &&
+ !(rtm->rtm_flags & RTF_GATEWAY)) switch (sdl->sdl_type) {
+ case IFT_ETHER: case IFT_FDDI: case IFT_ISO88023:
+ case IFT_ISO88024: case IFT_ISO88025:
+ goto overwrite;
+ }
+ if (doing_proxy == 0) {
+ syslog(LOG_ERR, "arptab_set: can only proxy for %s\n", inet_ntoa(sin->sin_addr));
+ return (1);
+ }
+ if (sin_m.sin_other & SIN_PROXY) {
+ syslog(LOG_ERR,"arptab_set: proxy entry exists for non 802 device\n");
+ return(1);
+ }
+ sin_m.sin_other = SIN_PROXY;
+ export_only = 1;
+ goto tryagain;
+ }
+overwrite:
+ if (sdl->sdl_family != AF_LINK) {
+ syslog(LOG_ERR,"arptab_set: cannot intuit interface index and type for %s\n", inet_ntoa(sin->sin_addr));
+ return (1);
+ }
+ sdl_m.sdl_type = sdl->sdl_type;
+ sdl_m.sdl_index = sdl->sdl_index;
+ return (rtmsg(RTM_ADD));
+}
+
+rtmsg(cmd)
+{
+ static int seq;
+ int rlen;
+ register struct rt_msghdr *rtm = &m_rtmsg.m_rtm;
+ register char *cp = m_rtmsg.m_space;
+ register int l;
+
+ errno = 0;
+ if (cmd == RTM_DELETE)
+ goto doit;
+ bzero((char *)&m_rtmsg, sizeof(m_rtmsg));
+ rtm->rtm_flags = flags;
+ rtm->rtm_version = RTM_VERSION;
+
+ switch (cmd) {
+ default:
+ syslog(LOG_ERR, "arptap_set: internal wrong cmd\n");
+ exit(1);
+ case RTM_ADD:
+ rtm->rtm_addrs |= RTA_GATEWAY;
+ rtm->rtm_rmx.rmx_expire = expire_time;
+ rtm->rtm_inits = RTV_EXPIRE;
+ rtm->rtm_flags |= (RTF_HOST | RTF_STATIC);
+ sin_m.sin_other = 0;
+ if (doing_proxy) {
+ if (export_only)
+ sin_m.sin_other = SIN_PROXY;
+ else {
+ rtm->rtm_addrs |= RTA_NETMASK;
+ rtm->rtm_flags &= ~RTF_HOST;
+ }
+ }
+ /* FALLTHROUGH */
+ case RTM_GET:
+ rtm->rtm_addrs |= RTA_DST;
+ }
+#define NEXTADDR(w, s) \
+ if (rtm->rtm_addrs & (w)) { \
+ bcopy((char *)&s, cp, sizeof(s)); cp += sizeof(s);}
+
+ NEXTADDR(RTA_DST, sin_m);
+ NEXTADDR(RTA_GATEWAY, sdl_m);
+ NEXTADDR(RTA_NETMASK, so_mask);
+
+ rtm->rtm_msglen = cp - (char *)&m_rtmsg;
+doit:
+ l = rtm->rtm_msglen;
+ rtm->rtm_seq = ++seq;
+ rtm->rtm_type = cmd;
+ if ((rlen = write(s, (char *)&m_rtmsg, l)) < 0) {
+ if (errno != ESRCH && errno != EEXIST) {
+ syslog(LOG_ERR, "writing to routing socket: %m");
+ return (-1);
+ }
+ }
+ do {
+ l = read(s, (char *)&m_rtmsg, sizeof(m_rtmsg));
+ } while (l > 0 && (rtm->rtm_seq != seq || rtm->rtm_pid != pid));
+ if (l < 0)
+ syslog(LOG_ERR, "arptab_set: read from routing socket: %m");
+ return (0);
+}
projects / openbsd / commitdiff