700 lines
16 KiB
C
700 lines
16 KiB
C
/* $NetBSD: arp.c,v 1.49 2010/06/10 06:03:20 dholland 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. 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\
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The Regents of the University of California. All rights reserved.");
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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 1.49 2010/06/10 06:03:20 dholland 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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#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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#include <ifaddrs.h>
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static int is_llinfo(const struct sockaddr_dl *, int);
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static int delete(const char *, const char *);
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static void dump(uint32_t);
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static void delete_all(void);
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static void sdl_print(const struct sockaddr_dl *);
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static int getifname(u_int16_t, char *, size_t);
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static int atosdl(const char *s, struct sockaddr_dl *sdl);
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static int file(const char *);
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static void get(const char *);
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static int getinetaddr(const char *, struct in_addr *);
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static void getsocket(void);
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static int rtmsg(int);
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static int set(int, char **);
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static void usage(void) __dead;
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static pid_t pid;
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static int aflag, nflag, vflag;
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static int s = -1;
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static struct ifaddrs* ifaddrs = NULL;
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static struct sockaddr_in so_mask = {
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.sin_len = 8,
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.sin_addr = {
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.s_addr = 0xffffffff
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}
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};
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static struct sockaddr_inarp blank_sin = {
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.sin_len = sizeof(blank_sin),
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.sin_family = AF_INET
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};
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static struct sockaddr_inarp sin_m;
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static struct sockaddr_dl blank_sdl = {
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.sdl_len = sizeof(blank_sdl),
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.sdl_family = AF_LINK
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};
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static struct sockaddr_dl sdl_m;
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static int expire_time, flags, export_only, doing_proxy, found_entry;
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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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int
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main(int argc, 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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static int
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file(const char *name)
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{
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char *line, *argv[5];
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int i, retval;
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FILE *fp;
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if (!strcmp(name, "-")) {
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fp = stdin;
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} else {
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fp = fopen(name, "r");
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if (fp == NULL) {
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err(1, "Cannot open %s", name);
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}
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}
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retval = 0;
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for (; (line = fparseln(fp, NULL, NULL, NULL, 0)) != NULL; free(line)) {
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char **ap, *inputstring;
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inputstring = line;
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for (ap = argv; ap < &argv[sizeof(argv) / sizeof(argv[0])] &&
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(*ap = stresep(&inputstring, " \t", '\\')) != NULL;) {
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if (**ap != '\0')
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ap++;
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}
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i = ap - argv;
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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, argv))
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retval = 1;
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}
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if (fp != stdin)
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(void)fclose(fp);
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return retval;
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}
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static void
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getsocket(void)
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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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/*
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* Set an individual arp entry
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*/
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static int
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set(int argc, char **argv)
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{
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struct sockaddr_inarp *sina;
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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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sina = &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, &sina->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 timev;
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(void)gettimeofday(&timev, 0);
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expire_time = timev.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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if (argc && strncmp(argv[1], "pro", 3) == 0) {
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export_only = 1;
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argc--; argv++;
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}
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} else if (strncmp(argv[0], "trail", 5) == 0) {
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warnx("%s: Sending trailers is no longer supported",
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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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sina = (struct sockaddr_inarp *)(void *)(rtm + 1);
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sdl = (struct sockaddr_dl *)(void *)(RT_ROUNDUP(sina->sin_len) +
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(char *)(void *)sina);
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if (sina->sin_addr.s_addr == sin_m.sin_addr.s_addr) {
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if (is_llinfo(sdl, rtm->rtm_flags))
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goto overwrite;
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if (doing_proxy == 0) {
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warnx("set: can only proxy for %s", 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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warnx("set: proxy entry exists for non 802 device");
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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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warnx("cannot intuit interface index and type for %s",
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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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static void
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get(const char *host)
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{
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struct sockaddr_inarp *sina;
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sina = &sin_m;
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sin_m = blank_sin; /* struct copy */
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if (getinetaddr(host, &sina->sin_addr) == -1)
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exit(1);
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dump(sina->sin_addr.s_addr);
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if (found_entry == 0)
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errx(1, "%s (%s) -- no entry", host, inet_ntoa(sina->sin_addr));
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}
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static int
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is_llinfo(const struct sockaddr_dl *sdl, int rtflags)
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{
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if (sdl->sdl_family != AF_LINK ||
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(rtflags & (RTF_LLINFO|RTF_GATEWAY)) != RTF_LLINFO)
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return 0;
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switch (sdl->sdl_type) {
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case IFT_ETHER:
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case IFT_FDDI:
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case IFT_ISO88023:
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case IFT_ISO88024:
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case IFT_ISO88025:
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case IFT_ARCNET:
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return 1;
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default:
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return 0;
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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(const char *host, const char *info)
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{
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struct sockaddr_inarp *sina;
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struct rt_msghdr *rtm;
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struct sockaddr_dl *sdl;
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sina = &sin_m;
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rtm = &m_rtmsg.m_rtm;
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getsocket();
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sin_m = blank_sin; /* struct copy */
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if (info && strncmp(info, "pro", 3) == 0)
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sina->sin_other = SIN_PROXY;
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if (getinetaddr(host, &sina->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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sina = (struct sockaddr_inarp *)(void *)(rtm + 1);
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sdl = (struct sockaddr_dl *)(void *)(RT_ROUNDUP(sina->sin_len) +
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(char *)(void *)sina);
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if (sina->sin_addr.s_addr == sin_m.sin_addr.s_addr &&
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is_llinfo(sdl, rtm->rtm_flags))
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goto delete;
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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)warnx("cannot locate %s", 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(sina->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(uint32_t 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 *lim, *buf, *next;
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const char *host;
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struct rt_msghdr *rtm;
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struct sockaddr_inarp *sina;
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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 *)(void *)next;
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sina = (struct sockaddr_inarp *)(void *)(rtm + 1);
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sdl = (struct sockaddr_dl *)(void *)
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(RT_ROUNDUP(sina->sin_len) + (char *)(void *)sina);
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if (addr) {
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if (addr != sina->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((const char *)(void *)
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&(sina->sin_addr),
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sizeof sina->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(sina->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, sizeof(ifname)) == 0)
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(void)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 (sina->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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sina = (struct sockaddr_inarp *)(void *)
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(RT_ROUNDUP(sdl->sdl_len) + (char *)(void *)sdl);
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if (sina->sin_addr.s_addr == 0xffffffff)
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(void)printf(" published");
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if (sina->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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free(buf);
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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 *sina;
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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 *)(void *)next;
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sina = (struct sockaddr_inarp *)(void *)(rtm + 1);
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(void)snprintf(addr, sizeof(addr), "%s",
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inet_ntoa(sina->sin_addr));
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(void)delete(addr, NULL);
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}
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|
free(buf);
|
|
}
|
|
|
|
void
|
|
sdl_print(const struct sockaddr_dl *sdl)
|
|
{
|
|
char hbuf[NI_MAXHOST];
|
|
|
|
if (getnameinfo((const struct sockaddr *)(const void *)sdl,
|
|
(socklen_t)sdl->sdl_len,
|
|
hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0)
|
|
(void)printf("<invalid>");
|
|
else
|
|
(void)printf("%s", hbuf);
|
|
}
|
|
|
|
static int
|
|
atosdl(const char *ss, struct sockaddr_dl *sdl)
|
|
{
|
|
int i;
|
|
unsigned long b;
|
|
char *endp;
|
|
char *p;
|
|
char *t, *r;
|
|
|
|
p = LLADDR(sdl);
|
|
endp = ((char *)(void *)sdl) + sdl->sdl_len;
|
|
i = 0;
|
|
|
|
b = strtoul(ss, &t, 16);
|
|
if (b > 255 || t == ss)
|
|
return 1;
|
|
|
|
*p++ = (char)b;
|
|
++i;
|
|
while ((p < endp) && (*t++ == ':')) {
|
|
b = strtoul(t, &r, 16);
|
|
if (b > 255 || r == t)
|
|
break;
|
|
*p++ = (char)b;
|
|
++i;
|
|
t = r;
|
|
}
|
|
sdl->sdl_alen = i;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
usage(void)
|
|
{
|
|
const char *progname;
|
|
|
|
progname = getprogname();
|
|
(void)fprintf(stderr, "Usage: %s [-n] hostname\n", progname);
|
|
(void)fprintf(stderr, " %s [-nv] -a\n", progname);
|
|
(void)fprintf(stderr, " %s [-v] -d [-a|hostname [pub [proxy]]]\n",
|
|
progname);
|
|
(void)fprintf(stderr, " %s -s hostname ether_addr [temp] [pub [proxy]]\n",
|
|
progname);
|
|
(void)fprintf(stderr, " %s -f filename\n", progname);
|
|
exit(1);
|
|
}
|
|
|
|
static int
|
|
rtmsg(int cmd)
|
|
{
|
|
static int seq;
|
|
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, \
|
|
(size_t)((struct sockaddr *)(void *)&s)->sa_len); \
|
|
RT_ADVANCE(cp, ((struct sockaddr *)(void *)&s)); \
|
|
}
|
|
|
|
NEXTADDR(RTA_DST, sin_m);
|
|
NEXTADDR(RTA_GATEWAY, sdl_m);
|
|
NEXTADDR(RTA_NETMASK, so_mask);
|
|
|
|
rtm->rtm_msglen = cp - (char *)(void *)&m_rtmsg;
|
|
doit:
|
|
l = rtm->rtm_msglen;
|
|
rtm->rtm_seq = ++seq;
|
|
rtm->rtm_type = cmd;
|
|
if (write(s, &m_rtmsg, (size_t)l) < 0) {
|
|
if (errno != ESRCH || cmd != RTM_DELETE) {
|
|
warn("writing to routing socket");
|
|
return (-1);
|
|
}
|
|
}
|
|
do {
|
|
l = read(s, &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);
|
|
}
|
|
|
|
static int
|
|
getinetaddr(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);
|
|
}
|
|
|
|
static int
|
|
getifname(u_int16_t ifindex, char *ifname, size_t l)
|
|
{
|
|
int i;
|
|
struct ifaddrs *addr;
|
|
const struct sockaddr_dl *sdl = NULL;
|
|
|
|
if (ifaddrs == NULL) {
|
|
i = getifaddrs(&ifaddrs);
|
|
if (i != 0)
|
|
err(1, "getifaddrs");
|
|
}
|
|
|
|
for (addr = ifaddrs; addr; addr = addr->ifa_next) {
|
|
if (addr->ifa_addr == NULL ||
|
|
addr->ifa_addr->sa_family != AF_LINK)
|
|
continue;
|
|
|
|
sdl = (const struct sockaddr_dl *)(void *)addr->ifa_addr;
|
|
if (sdl && sdl->sdl_index == ifindex) {
|
|
(void) strlcpy(ifname, addr->ifa_name, l);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
return -1;
|
|
}
|