714 lines
16 KiB
C
714 lines
16 KiB
C
/* $NetBSD: arp.c,v 1.34 2002/03/02 03:45:07 tv Exp $ */
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/*
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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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*
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* This code is derived from software contributed to Berkeley by
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* 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. 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 University of
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* California, Berkeley and its contributors.
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* 4. 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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#include <sys/cdefs.h>
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#ifndef lint
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__COPYRIGHT("@(#) Copyright (c) 1984, 1993\n\
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The Regents of the University of California. All rights reserved.\n");
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#endif /* not lint */
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)arp.c 8.3 (Berkeley) 4/28/95";
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#else
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__RCSID("$NetBSD: arp.c,v 1.34 2002/03/02 03:45:07 tv Exp $");
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#endif
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#endif /* not lint */
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/*
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* arp - display, set, and delete arp table entries
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*/
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/* Roundup the same way rt_xaddrs does */
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#define ROUNDUP(a) \
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((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long))
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#include <sys/param.h>
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#include <sys/file.h>
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#include <sys/socket.h>
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#include <sys/sysctl.h>
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#include <sys/ioctl.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_ether.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_inarp.h>
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#include <arpa/inet.h>
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#include <err.h>
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#include <errno.h>
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#include <netdb.h>
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#include <nlist.h>
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#include <paths.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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int delete __P((const char *, const char *));
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void dump __P((u_long));
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void delete_all __P((void));
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void sdl_print __P((const struct sockaddr_dl *));
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int getifname __P((u_int16_t, char *));
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int atosdl __P((const char *s, struct sockaddr_dl *sdl));
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int file __P((char *));
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void get __P((const char *));
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int getinetaddr __P((const char *, struct in_addr *));
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void getsocket __P((void));
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int main __P((int, char **));
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int rtmsg __P((int));
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int set __P((int, char **));
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void usage __P((void));
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static int pid;
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static int aflag, nflag, vflag;
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static int s = -1;
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static int is = -1;
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static struct ifconf ifc;
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static char ifconfbuf[8192];
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int
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main(argc, argv)
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int argc;
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char **argv;
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{
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int ch;
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int op = 0;
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setprogname(argv[0]);
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pid = getpid();
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while ((ch = getopt(argc, argv, "andsfv")) != -1)
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switch((char)ch) {
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case 'a':
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aflag = 1;
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break;
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case 'd':
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case 's':
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case 'f':
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if (op)
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usage();
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op = ch;
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break;
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case 'n':
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nflag = 1;
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break;
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case 'v':
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vflag = 1;
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break;
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default:
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usage();
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}
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argc -= optind;
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argv += optind;
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if (!op && aflag)
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op = 'a';
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switch((char)op) {
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case 'a':
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dump(0);
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break;
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case 'd':
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if (aflag && argc == 0)
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delete_all();
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else {
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if (aflag || argc < 1 || argc > 2)
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usage();
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(void)delete(argv[0], argv[1]);
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}
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break;
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case 's':
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if (argc < 2 || argc > 5)
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usage();
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return (set(argc, argv) ? 1 : 0);
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case 'f':
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if (argc != 1)
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usage();
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return (file(argv[0]));
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default:
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if (argc != 1)
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usage();
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get(argv[0]);
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break;
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}
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return (0);
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}
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/*
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* Process a file to set standard arp entries
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*/
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int
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file(name)
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char *name;
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{
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char line[100], arg[5][50], *args[5];
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int i, retval;
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FILE *fp;
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if ((fp = fopen(name, "r")) == NULL)
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err(1, "cannot open %s", name);
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args[0] = &arg[0][0];
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args[1] = &arg[1][0];
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args[2] = &arg[2][0];
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args[3] = &arg[3][0];
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args[4] = &arg[4][0];
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retval = 0;
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while (fgets(line, 100, fp) != NULL) {
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i = sscanf(line, "%s %s %s %s %s", arg[0], arg[1], arg[2],
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arg[3], arg[4]);
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if (i < 2) {
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warnx("bad line: %s", line);
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retval = 1;
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continue;
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}
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if (set(i, args))
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retval = 1;
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}
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fclose(fp);
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return (retval);
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}
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void
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getsocket()
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{
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if (s >= 0)
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return;
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s = socket(PF_ROUTE, SOCK_RAW, 0);
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if (s < 0)
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err(1, "socket");
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}
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struct sockaddr_in so_mask = {8, 0, 0, { 0xffffffff}};
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struct sockaddr_inarp blank_sin = {sizeof(blank_sin), AF_INET }, sin_m;
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struct sockaddr_dl blank_sdl = {sizeof(blank_sdl), AF_LINK }, sdl_m;
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int expire_time, flags, export_only, doing_proxy, found_entry;
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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
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set(argc, argv)
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int argc;
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char **argv;
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{
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struct sockaddr_inarp *sin;
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struct sockaddr_dl *sdl;
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struct rt_msghdr *rtm;
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char *host = argv[0], *eaddr;
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int rval;
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sin = &sin_m;
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rtm = &(m_rtmsg.m_rtm);
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eaddr = argv[1];
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getsocket();
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argc -= 2;
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argv += 2;
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sdl_m = blank_sdl; /* struct copy */
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sin_m = blank_sin; /* struct copy */
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if (getinetaddr(host, &sin->sin_addr) == -1)
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return (1);
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if (atosdl(eaddr, &sdl_m))
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warnx("invalid link-level address '%s'", eaddr);
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doing_proxy = flags = export_only = expire_time = 0;
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while (argc-- > 0) {
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if (strncmp(argv[0], "temp", 4) == 0) {
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struct timeval time;
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(void)gettimeofday(&time, 0);
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expire_time = time.tv_sec + 20 * 60;
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}
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else if (strncmp(argv[0], "pub", 3) == 0) {
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flags |= RTF_ANNOUNCE;
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doing_proxy = SIN_PROXY;
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} else if (strncmp(argv[0], "trail", 5) == 0) {
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(void)printf(
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"%s: Sending trailers is no longer supported\n",
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host);
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}
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argv++;
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}
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tryagain:
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if (rtmsg(RTM_GET) < 0) {
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warn("%s", host);
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return (1);
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}
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sin = (struct sockaddr_inarp *)(rtm + 1);
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sdl = (struct sockaddr_dl *)(ROUNDUP(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_LLINFO) &&
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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: case IFT_ARCNET:
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goto overwrite;
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}
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if (doing_proxy == 0) {
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(void)printf("set: can only proxy for %s\n", host);
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return (1);
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}
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if (sin_m.sin_other & SIN_PROXY) {
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(void)printf(
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"set: proxy entry exists for non 802 device\n");
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return (1);
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}
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sin_m.sin_other = SIN_PROXY;
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export_only = 1;
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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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(void)printf("cannot intuit interface index and type for %s\n",
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host);
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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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rval = rtmsg(RTM_ADD);
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if (vflag)
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(void)printf("%s (%s) added\n", host, eaddr);
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return (rval);
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}
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/*
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* Display an individual arp entry
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*/
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void
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get(host)
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const char *host;
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{
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struct sockaddr_inarp *sin;
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sin = &sin_m;
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sin_m = blank_sin; /* struct copy */
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if (getinetaddr(host, &sin->sin_addr) == -1)
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exit(1);
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dump(sin->sin_addr.s_addr);
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if (found_entry == 0) {
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(void)printf("%s (%s) -- no entry\n", host,
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inet_ntoa(sin->sin_addr));
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exit(1);
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}
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}
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/*
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* Delete an arp entry
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*/
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int
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delete(host, info)
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const char *host;
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const char *info;
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{
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struct sockaddr_inarp *sin;
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struct rt_msghdr *rtm;
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struct sockaddr_dl *sdl;
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sin = &sin_m;
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rtm = &m_rtmsg.m_rtm;
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if (info && strncmp(info, "pro", 3) )
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export_only = 1;
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getsocket();
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sin_m = blank_sin; /* struct copy */
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if (getinetaddr(host, &sin->sin_addr) == -1)
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return (1);
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tryagain:
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if (rtmsg(RTM_GET) < 0) {
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warn("%s", host);
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return (1);
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}
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sin = (struct sockaddr_inarp *)(rtm + 1);
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sdl = (struct sockaddr_dl *)(ROUNDUP(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_LLINFO) &&
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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: case IFT_ARCNET:
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goto delete;
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}
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}
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if (sin_m.sin_other & SIN_PROXY) {
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warnx("delete: can't locate %s", host);
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return (1);
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} else {
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sin_m.sin_other = SIN_PROXY;
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goto tryagain;
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}
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delete:
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if (sdl->sdl_family != AF_LINK) {
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(void)printf("cannot locate %s\n", host);
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return (1);
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}
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if (rtmsg(RTM_DELETE))
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return (1);
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if (vflag)
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(void)printf("%s (%s) deleted\n", host,
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inet_ntoa(sin->sin_addr));
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return (0);
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}
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/*
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* Dump the entire arp table
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*/
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void
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dump(addr)
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u_long addr;
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{
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int mib[6];
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size_t needed;
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char ifname[IFNAMSIZ];
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char *host, *lim, *buf, *next;
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struct rt_msghdr *rtm;
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struct sockaddr_inarp *sin;
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struct sockaddr_dl *sdl;
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struct hostent *hp;
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mib[0] = CTL_NET;
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mib[1] = PF_ROUTE;
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mib[2] = 0;
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mib[3] = AF_INET;
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mib[4] = NET_RT_FLAGS;
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mib[5] = RTF_LLINFO;
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if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0)
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err(1, "route-sysctl-estimate");
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if (needed == 0)
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return;
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if ((buf = malloc(needed)) == NULL)
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err(1, "malloc");
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if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0)
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err(1, "actual retrieval of routing table");
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lim = buf + needed;
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for (next = buf; next < lim; next += rtm->rtm_msglen) {
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rtm = (struct rt_msghdr *)next;
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sin = (struct sockaddr_inarp *)(rtm + 1);
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sdl = (struct sockaddr_dl *)
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(ROUNDUP(sin->sin_len) + (char *)sin);
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if (addr) {
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if (addr != sin->sin_addr.s_addr)
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continue;
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found_entry = 1;
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}
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if (nflag == 0)
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hp = gethostbyaddr((caddr_t)&(sin->sin_addr),
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sizeof sin->sin_addr, AF_INET);
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else
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hp = NULL;
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host = hp ? hp->h_name : "?";
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(void)printf("%s (%s) at ", host, inet_ntoa(sin->sin_addr));
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if (sdl->sdl_alen)
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sdl_print(sdl);
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else
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(void)printf("(incomplete)");
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if (sdl->sdl_index) {
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if (getifname(sdl->sdl_index, ifname) == 0)
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printf(" on %s", ifname);
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}
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if (rtm->rtm_rmx.rmx_expire == 0)
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(void)printf(" permanent");
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if (sin->sin_other & SIN_PROXY)
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(void)printf(" published (proxy only)");
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if (rtm->rtm_addrs & RTA_NETMASK) {
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sin = (struct sockaddr_inarp *)
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(ROUNDUP(sdl->sdl_len) + (char *)sdl);
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if (sin->sin_addr.s_addr == 0xffffffff)
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(void)printf(" published");
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if (sin->sin_len != 8)
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(void)printf("(weird)");
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}
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(void)printf("\n");
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}
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}
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/*
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* Delete the entire arp table
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*/
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void
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delete_all(void)
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{
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int mib[6];
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size_t needed;
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char addr[sizeof("000.000.000.000\0")];
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char *lim, *buf, *next;
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struct rt_msghdr *rtm;
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struct sockaddr_inarp *sin;
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struct sockaddr_dl *sdl;
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mib[0] = CTL_NET;
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mib[1] = PF_ROUTE;
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mib[2] = 0;
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mib[3] = AF_INET;
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mib[4] = NET_RT_FLAGS;
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mib[5] = RTF_LLINFO;
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if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0)
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err(1, "route-sysctl-estimate");
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if (needed == 0)
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return;
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if ((buf = malloc(needed)) == NULL)
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err(1, "malloc");
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if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0)
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err(1, "actual retrieval of routing table");
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lim = buf + needed;
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for (next = buf; next < lim; next += rtm->rtm_msglen) {
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rtm = (struct rt_msghdr *)next;
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sin = (struct sockaddr_inarp *)(rtm + 1);
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sdl = (struct sockaddr_dl *)
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(ROUNDUP(sin->sin_len) + (char *)sin);
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snprintf(addr, sizeof(addr), "%s", inet_ntoa(sin->sin_addr));
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delete(addr, NULL);
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}
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}
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void
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sdl_print(sdl)
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const struct sockaddr_dl *sdl;
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{
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char hbuf[NI_MAXHOST];
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if (getnameinfo((struct sockaddr *)sdl, sdl->sdl_len,
|
|
hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0)
|
|
printf("<invalid>");
|
|
else
|
|
printf("%s", hbuf);
|
|
}
|
|
|
|
int
|
|
atosdl(s, sdl)
|
|
const char *s;
|
|
struct sockaddr_dl *sdl;
|
|
{
|
|
int i;
|
|
long b;
|
|
caddr_t endp;
|
|
caddr_t p;
|
|
char *t, *r;
|
|
|
|
p = LLADDR(sdl);
|
|
endp = ((caddr_t)sdl) + sdl->sdl_len;
|
|
i = 0;
|
|
|
|
b = strtol(s, &t, 16);
|
|
if (t == s)
|
|
return 1;
|
|
|
|
*p++ = b;
|
|
++i;
|
|
while ((p < endp) && (*t++ == ':')) {
|
|
b = strtol(t, &r, 16);
|
|
if (r == t)
|
|
break;
|
|
*p++ = b;
|
|
++i;
|
|
t = r;
|
|
}
|
|
sdl->sdl_alen = i;
|
|
|
|
return 0;
|
|
}
|
|
|
|
void
|
|
usage()
|
|
{
|
|
const char *progname;
|
|
|
|
progname = getprogname();
|
|
(void)fprintf(stderr, "usage: %s [-n] hostname\n", progname);
|
|
(void)fprintf(stderr, "usage: %s [-n] -a\n", progname);
|
|
(void)fprintf(stderr, "usage: %s -d [-a|hostname]\n", progname);
|
|
(void)fprintf(stderr,
|
|
"usage: %s -s hostname ether_addr [temp] [pub]\n", progname);
|
|
(void)fprintf(stderr, "usage: %s -f filename\n", progname);
|
|
exit(1);
|
|
}
|
|
|
|
int
|
|
rtmsg(cmd)
|
|
int cmd;
|
|
{
|
|
static int seq;
|
|
int rlen;
|
|
struct rt_msghdr *rtm;
|
|
char *cp;
|
|
int l;
|
|
|
|
rtm = &m_rtmsg.m_rtm;
|
|
cp = m_rtmsg.m_space;
|
|
errno = 0;
|
|
|
|
if (cmd == RTM_DELETE)
|
|
goto doit;
|
|
(void)memset(&m_rtmsg, 0, sizeof(m_rtmsg));
|
|
rtm->rtm_flags = flags;
|
|
rtm->rtm_version = RTM_VERSION;
|
|
|
|
switch (cmd) {
|
|
default:
|
|
errx(1, "internal wrong cmd");
|
|
/*NOTREACHED*/
|
|
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)) { \
|
|
(void)memcpy(cp, &s, ((struct sockaddr *)&s)->sa_len); \
|
|
cp += ROUNDUP(((struct sockaddr *)&s)->sa_len); \
|
|
}
|
|
|
|
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 || cmd != RTM_DELETE) {
|
|
warn("writing to routing socket");
|
|
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)
|
|
warn("read from routing socket");
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
getinetaddr(host, inap)
|
|
const char *host;
|
|
struct in_addr *inap;
|
|
{
|
|
struct hostent *hp;
|
|
|
|
if (inet_aton(host, inap) == 1)
|
|
return (0);
|
|
if ((hp = gethostbyname(host)) == NULL) {
|
|
warnx("%s: %s", host, hstrerror(h_errno));
|
|
return (-1);
|
|
}
|
|
(void)memcpy(inap, hp->h_addr, sizeof(*inap));
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
getifname(ifindex, ifname)
|
|
u_int16_t ifindex;
|
|
char* ifname;
|
|
{
|
|
int i, idx, siz;
|
|
char ifrbuf[8192];
|
|
struct ifreq ifreq, *ifr;
|
|
const struct sockaddr_dl *sdl = NULL;
|
|
|
|
if (is < 0) {
|
|
is = socket(PF_INET, SOCK_DGRAM, 0);
|
|
if (is < 0)
|
|
err(1, "socket");
|
|
|
|
ifc.ifc_len = sizeof(ifconfbuf);
|
|
ifc.ifc_buf = ifconfbuf;
|
|
|
|
if (ioctl(is, SIOCGIFCONF, &ifc) < 0) {
|
|
close(is);
|
|
err(1, "SIOCGIFCONF");
|
|
is = -1;
|
|
}
|
|
}
|
|
|
|
ifr = ifc.ifc_req;
|
|
ifreq.ifr_name[0] = '\0';
|
|
for (i = 0, idx = 0; i < ifc.ifc_len; ) {
|
|
ifr = (struct ifreq *)((caddr_t)ifc.ifc_req + i);
|
|
siz = sizeof(ifr->ifr_name) +
|
|
(ifr->ifr_addr.sa_len > sizeof(struct sockaddr)
|
|
? ifr->ifr_addr.sa_len
|
|
: sizeof(struct sockaddr));
|
|
i += siz;
|
|
/* avoid alignment issue */
|
|
if (sizeof(ifrbuf) < siz)
|
|
errx(1, "ifr too big");
|
|
|
|
memcpy(ifrbuf, ifr, siz);
|
|
ifr = (struct ifreq *)ifrbuf;
|
|
|
|
if (ifr->ifr_addr.sa_family != AF_LINK)
|
|
continue;
|
|
|
|
sdl = (const struct sockaddr_dl *) &ifr->ifr_addr;
|
|
if (sdl && sdl->sdl_index == ifindex) {
|
|
(void) strncpy(ifname, ifr->ifr_name, IFNAMSIZ);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
return -1;
|
|
}
|