2006-04-12 17:55:51 +00:00
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/* vi: set sw=4 ts=4: */
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2003-01-09 10:06:01 +00:00
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/*
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* arping.c - Ping hosts by ARP requests/replies
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*
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2006-03-30 21:50:57 +00:00
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* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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2003-01-09 10:06:01 +00:00
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*
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* Author: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
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* Busybox port: Nick Fedchik <nick@fedchik.org.ua>
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*/
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#include <sys/ioctl.h>
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2006-03-22 00:25:07 +00:00
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#include <signal.h>
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2003-01-09 10:06:01 +00:00
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#include <arpa/inet.h>
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#include <net/if.h>
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#include <netinet/ether.h>
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#include <netpacket/packet.h>
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2007-05-26 19:00:18 +00:00
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#include "libbb.h"
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2003-01-09 10:06:01 +00:00
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2003-09-26 00:33:18 +00:00
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static struct in_addr src;
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static struct in_addr dst;
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static struct sockaddr_ll me;
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static struct sockaddr_ll he;
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static struct timeval last;
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2006-03-31 18:02:46 +00:00
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enum cfg_e {
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dad = 1,
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unsolicited = 2,
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advert = 4,
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quiet = 8,
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quit_on_reply = 16,
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2006-04-03 09:46:29 +00:00
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broadcast_only = 32,
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unicasting = 64
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2006-03-30 21:50:57 +00:00
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};
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2006-03-31 18:02:46 +00:00
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static int cfg;
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2006-03-30 21:50:57 +00:00
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static int s;
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2006-10-08 12:49:22 +00:00
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static unsigned count = UINT_MAX;
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static unsigned timeout;
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2003-09-26 00:33:18 +00:00
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static int sent;
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static int brd_sent;
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static int received;
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static int brd_recv;
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static int req_recv;
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2003-01-09 10:06:01 +00:00
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#define MS_TDIFF(tv1,tv2) ( ((tv1).tv_sec-(tv2).tv_sec)*1000 + \
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2006-12-23 02:48:44 +00:00
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((tv1).tv_usec-(tv2).tv_usec)/1000 )
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2003-01-19 13:31:41 +00:00
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static int send_pack(int sock, struct in_addr *src_addr,
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2006-12-23 02:48:44 +00:00
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struct in_addr *dst_addr, struct sockaddr_ll *ME,
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struct sockaddr_ll *HE)
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2003-01-09 10:06:01 +00:00
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{
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int err;
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struct timeval now;
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2006-03-31 18:13:42 +00:00
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RESERVE_CONFIG_UBUFFER(buf, 256);
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2003-01-09 10:06:01 +00:00
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struct arphdr *ah = (struct arphdr *) buf;
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unsigned char *p = (unsigned char *) (ah + 1);
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ah->ar_hrd = htons(ME->sll_hatype);
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ah->ar_hrd = htons(ARPHRD_ETHER);
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ah->ar_pro = htons(ETH_P_IP);
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ah->ar_hln = ME->sll_halen;
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ah->ar_pln = 4;
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2006-12-23 02:48:44 +00:00
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ah->ar_op = cfg & advert ? htons(ARPOP_REPLY) : htons(ARPOP_REQUEST);
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2003-01-09 10:06:01 +00:00
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memcpy(p, &ME->sll_addr, ah->ar_hln);
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p += ME->sll_halen;
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memcpy(p, src_addr, 4);
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p += 4;
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2006-12-23 02:48:44 +00:00
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if (cfg & advert)
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2003-01-09 10:06:01 +00:00
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memcpy(p, &ME->sll_addr, ah->ar_hln);
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else
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memcpy(p, &HE->sll_addr, ah->ar_hln);
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p += ah->ar_hln;
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memcpy(p, dst_addr, 4);
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p += 4;
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gettimeofday(&now, NULL);
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err = sendto(sock, buf, p - buf, 0, (struct sockaddr *) HE, sizeof(*HE));
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if (err == p - buf) {
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last = now;
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sent++;
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2006-12-23 02:48:44 +00:00
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if (!(cfg & unicasting))
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2003-01-09 10:06:01 +00:00
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brd_sent++;
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}
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2006-03-31 18:13:42 +00:00
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RELEASE_CONFIG_BUFFER(buf);
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2003-01-09 10:06:01 +00:00
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return err;
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}
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2005-04-16 19:39:00 +00:00
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static void finish(void)
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2003-01-09 10:06:01 +00:00
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{
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2006-12-23 02:48:44 +00:00
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if (!(cfg & quiet)) {
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printf("Sent %d probe(s) (%d broadcast(s))\n"
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"Received %d repl%s"
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" (%d request(s), %d broadcast(s))\n",
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2006-04-03 12:29:12 +00:00
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sent, brd_sent,
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2006-12-23 02:48:44 +00:00
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received, (received == 1) ? "ies" : "y",
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req_recv, brd_recv);
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2003-01-09 10:06:01 +00:00
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}
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2006-12-23 02:48:44 +00:00
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if (cfg & dad)
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2003-01-09 10:06:01 +00:00
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exit(!!received);
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2006-12-23 02:48:44 +00:00
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if (cfg & unsolicited)
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2003-01-09 10:06:01 +00:00
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exit(0);
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exit(!received);
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}
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2005-04-16 19:39:00 +00:00
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static void catcher(void)
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2003-01-09 10:06:01 +00:00
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{
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struct timeval tv;
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2003-08-28 19:54:16 +00:00
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static struct timeval start;
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2003-01-09 10:06:01 +00:00
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gettimeofday(&tv, NULL);
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if (start.tv_sec == 0)
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start = tv;
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if (count-- == 0
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2006-12-23 02:48:44 +00:00
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|| (timeout && MS_TDIFF(tv, start) > timeout * 1000 + 500))
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2003-01-09 10:06:01 +00:00
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finish();
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if (last.tv_sec == 0 || MS_TDIFF(tv, last) > 500) {
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send_pack(s, &src, &dst, &me, &he);
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2006-12-23 02:48:44 +00:00
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if (count == 0 && (cfg & unsolicited))
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2003-01-09 10:06:01 +00:00
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finish();
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}
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alarm(1);
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}
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2005-04-16 19:39:00 +00:00
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static int recv_pack(unsigned char *buf, int len, struct sockaddr_ll *FROM)
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2003-01-09 10:06:01 +00:00
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{
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struct arphdr *ah = (struct arphdr *) buf;
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unsigned char *p = (unsigned char *) (ah + 1);
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struct in_addr src_ip, dst_ip;
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/* Filter out wild packets */
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2006-12-23 02:48:44 +00:00
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if (FROM->sll_pkttype != PACKET_HOST
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&& FROM->sll_pkttype != PACKET_BROADCAST
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&& FROM->sll_pkttype != PACKET_MULTICAST)
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2003-01-09 10:06:01 +00:00
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return 0;
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/* Only these types are recognised */
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if (ah->ar_op != htons(ARPOP_REQUEST) && ah->ar_op != htons(ARPOP_REPLY))
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return 0;
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/* ARPHRD check and this darned FDDI hack here :-( */
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2006-12-23 02:48:44 +00:00
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if (ah->ar_hrd != htons(FROM->sll_hatype)
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&& (FROM->sll_hatype != ARPHRD_FDDI || ah->ar_hrd != htons(ARPHRD_ETHER)))
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2003-01-09 10:06:01 +00:00
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return 0;
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/* Protocol must be IP. */
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if (ah->ar_pro != htons(ETH_P_IP))
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return 0;
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if (ah->ar_pln != 4)
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return 0;
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if (ah->ar_hln != me.sll_halen)
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return 0;
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if (len < sizeof(*ah) + 2 * (4 + ah->ar_hln))
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return 0;
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memcpy(&src_ip, p + ah->ar_hln, 4);
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memcpy(&dst_ip, p + ah->ar_hln + 4 + ah->ar_hln, 4);
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2006-12-23 02:48:44 +00:00
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if (!(cfg & dad)) {
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2003-01-09 10:06:01 +00:00
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if (src_ip.s_addr != dst.s_addr)
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return 0;
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if (src.s_addr != dst_ip.s_addr)
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return 0;
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if (memcmp(p + ah->ar_hln + 4, &me.sll_addr, ah->ar_hln))
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return 0;
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} else {
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/* DAD packet was:
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src_ip = 0 (or some src)
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src_hw = ME
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dst_ip = tested address
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dst_hw = <unspec>
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We fail, if receive request/reply with:
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src_ip = tested_address
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src_hw != ME
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if src_ip in request was not zero, check
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also that it matches to dst_ip, otherwise
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dst_ip/dst_hw do not matter.
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*/
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if (src_ip.s_addr != dst.s_addr)
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return 0;
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if (memcmp(p, &me.sll_addr, me.sll_halen) == 0)
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return 0;
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if (src.s_addr && src.s_addr != dst_ip.s_addr)
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return 0;
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}
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2006-12-23 02:48:44 +00:00
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if (!(cfg & quiet)) {
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2003-01-09 10:06:01 +00:00
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int s_printed = 0;
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2006-03-30 21:50:57 +00:00
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struct timeval tv;
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gettimeofday(&tv, NULL);
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2003-01-09 10:06:01 +00:00
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2006-12-23 02:48:44 +00:00
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printf("%scast re%s from %s [%s]",
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FROM->sll_pkttype == PACKET_HOST ? "Uni" : "Broad",
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ah->ar_op == htons(ARPOP_REPLY) ? "ply" : "quest",
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2006-04-03 12:29:12 +00:00
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inet_ntoa(src_ip),
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ether_ntoa((struct ether_addr *) p));
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2003-01-09 10:06:01 +00:00
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if (dst_ip.s_addr != src.s_addr) {
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printf("for %s ", inet_ntoa(dst_ip));
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s_printed = 1;
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}
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if (memcmp(p + ah->ar_hln + 4, me.sll_addr, ah->ar_hln)) {
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if (!s_printed)
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printf("for ");
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printf("[%s]",
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2006-12-23 02:48:44 +00:00
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ether_ntoa((struct ether_addr *) p + ah->ar_hln + 4));
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2003-01-09 10:06:01 +00:00
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}
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2006-03-30 21:50:57 +00:00
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2003-01-09 10:06:01 +00:00
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if (last.tv_sec) {
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long usecs = (tv.tv_sec - last.tv_sec) * 1000000 +
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tv.tv_usec - last.tv_usec;
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long msecs = (usecs + 500) / 1000;
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usecs -= msecs * 1000 - 500;
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printf(" %ld.%03ldms\n", msecs, usecs);
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} else {
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printf(" UNSOLICITED?\n");
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}
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fflush(stdout);
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}
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received++;
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if (FROM->sll_pkttype != PACKET_HOST)
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brd_recv++;
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if (ah->ar_op == htons(ARPOP_REQUEST))
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req_recv++;
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2006-12-23 02:48:44 +00:00
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if (cfg & quit_on_reply)
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2003-01-09 10:06:01 +00:00
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finish();
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2006-12-23 02:48:44 +00:00
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if (!(cfg & broadcast_only)) {
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2003-01-09 10:06:01 +00:00
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memcpy(he.sll_addr, p, me.sll_halen);
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2006-03-31 18:02:46 +00:00
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cfg |= unicasting;
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2003-01-09 10:06:01 +00:00
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}
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return 1;
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}
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2007-02-03 17:28:39 +00:00
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int arping_main(int argc, char **argv);
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2003-01-09 10:06:01 +00:00
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int arping_main(int argc, char **argv)
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{
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2007-01-29 22:51:25 +00:00
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const char *device = "eth0";
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2006-03-30 21:50:57 +00:00
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int ifindex;
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2003-01-09 10:06:01 +00:00
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char *source = NULL;
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char *target;
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2006-09-03 12:21:59 +00:00
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s = xsocket(PF_PACKET, SOCK_DGRAM, 0);
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2003-01-09 10:06:01 +00:00
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2006-07-16 08:06:34 +00:00
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// Drop suid root privileges
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xsetuid(getuid());
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2003-01-09 10:06:01 +00:00
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2006-03-31 18:02:46 +00:00
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{
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2006-10-03 21:00:06 +00:00
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unsigned opt;
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2006-09-23 12:46:30 +00:00
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char *_count, *_timeout;
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2006-04-03 11:52:01 +00:00
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/* Dad also sets quit_on_reply.
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* Advert also sets unsolicited.
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*/
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2006-10-03 21:00:06 +00:00
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opt_complementary = "Df:AU";
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opt = getopt32(argc, argv, "DUAqfbc:w:i:s:",
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2006-09-23 12:46:30 +00:00
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&_count, &_timeout, &device, &source);
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cfg |= opt & 0x3f; /* set respective flags */
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if (opt & 0x40) /* -c: count */
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2006-10-08 12:49:22 +00:00
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count = xatou(_count);
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2006-09-23 12:46:30 +00:00
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if (opt & 0x80) /* -w: timeout */
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2006-10-08 12:49:22 +00:00
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timeout = xatoul_range(_timeout, 0, INT_MAX/2000);
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2006-12-23 02:48:44 +00:00
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//if (opt & 0x100) /* -i: interface */
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if (strlen(device) > IF_NAMESIZE) {
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bb_error_msg_and_die("interface name '%s' is too long",
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device);
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2003-01-09 10:06:01 +00:00
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}
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2006-09-23 12:46:30 +00:00
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//if (opt & 0x200) /* -s: source */
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2003-01-09 10:06:01 +00:00
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}
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argc -= optind;
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argv += optind;
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if (argc != 1)
|
2003-03-19 09:13:01 +00:00
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bb_show_usage();
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2003-01-09 10:06:01 +00:00
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target = *argv;
|
2006-03-31 18:02:46 +00:00
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|
2006-10-03 20:28:06 +00:00
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xfunc_error_retval = 2;
|
2003-01-09 10:06:01 +00:00
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|
2003-02-09 07:01:33 +00:00
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|
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{
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2003-01-09 10:06:01 +00:00
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struct ifreq ifr;
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memset(&ifr, 0, sizeof(ifr));
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strncpy(ifr.ifr_name, device, IFNAMSIZ - 1);
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|
if (ioctl(s, SIOCGIFINDEX, &ifr) < 0) {
|
2006-09-23 12:46:30 +00:00
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|
bb_error_msg_and_die("interface %s not found", device);
|
2003-01-09 10:06:01 +00:00
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|
}
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ifindex = ifr.ifr_ifindex;
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|
|
if (ioctl(s, SIOCGIFFLAGS, (char *) &ifr)) {
|
2006-03-30 21:50:57 +00:00
|
|
|
bb_error_msg_and_die("SIOCGIFFLAGS");
|
2003-01-09 10:06:01 +00:00
|
|
|
}
|
|
|
|
if (!(ifr.ifr_flags & IFF_UP)) {
|
2006-09-23 12:46:30 +00:00
|
|
|
bb_error_msg_and_die("interface %s is down", device);
|
2003-01-09 10:06:01 +00:00
|
|
|
}
|
|
|
|
if (ifr.ifr_flags & (IFF_NOARP | IFF_LOOPBACK)) {
|
2006-09-23 12:46:30 +00:00
|
|
|
bb_error_msg("interface %s is not ARPable", device);
|
2006-12-23 02:48:44 +00:00
|
|
|
return (cfg & dad ? 0 : 2);
|
2003-01-09 10:06:01 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2003-02-09 07:01:33 +00:00
|
|
|
if (!inet_aton(target, &dst)) {
|
2007-01-25 19:44:38 +00:00
|
|
|
len_and_sockaddr *lsa;
|
2007-02-04 02:39:08 +00:00
|
|
|
lsa = xhost_and_af2sockaddr(target, 0, AF_INET);
|
2007-01-25 19:44:38 +00:00
|
|
|
memcpy(&dst, &lsa->sin.sin_addr.s_addr, 4);
|
|
|
|
if (ENABLE_FEATURE_CLEAN_UP)
|
|
|
|
free(lsa);
|
2003-01-09 10:06:01 +00:00
|
|
|
}
|
|
|
|
|
2003-02-09 07:01:33 +00:00
|
|
|
if (source && !inet_aton(source, &src)) {
|
2006-03-30 21:50:57 +00:00
|
|
|
bb_error_msg_and_die("invalid source address %s", source);
|
2003-01-09 10:06:01 +00:00
|
|
|
}
|
|
|
|
|
2006-12-23 02:48:44 +00:00
|
|
|
if (!(cfg & dad) && (cfg & unsolicited) && src.s_addr == 0)
|
2003-01-09 10:06:01 +00:00
|
|
|
src = dst;
|
|
|
|
|
2006-12-23 02:48:44 +00:00
|
|
|
if (!(cfg & dad) || src.s_addr) {
|
2003-01-09 10:06:01 +00:00
|
|
|
struct sockaddr_in saddr;
|
2006-09-03 12:21:59 +00:00
|
|
|
int probe_fd = xsocket(AF_INET, SOCK_DGRAM, 0);
|
2003-01-09 10:06:01 +00:00
|
|
|
|
|
|
|
if (device) {
|
2006-12-23 02:48:44 +00:00
|
|
|
if (setsockopt(probe_fd, SOL_SOCKET, SO_BINDTODEVICE, device, strlen(device) + 1) == -1)
|
2006-09-23 12:46:30 +00:00
|
|
|
bb_error_msg("warning: interface %s is ignored", device);
|
2003-01-09 10:06:01 +00:00
|
|
|
}
|
|
|
|
memset(&saddr, 0, sizeof(saddr));
|
|
|
|
saddr.sin_family = AF_INET;
|
|
|
|
if (src.s_addr) {
|
|
|
|
saddr.sin_addr = src;
|
2006-12-23 02:48:44 +00:00
|
|
|
xbind(probe_fd, (struct sockaddr *) &saddr, sizeof(saddr));
|
|
|
|
} else if (!(cfg & dad)) {
|
2006-01-30 22:30:41 +00:00
|
|
|
socklen_t alen = sizeof(saddr);
|
2003-01-09 10:06:01 +00:00
|
|
|
|
|
|
|
saddr.sin_port = htons(1025);
|
|
|
|
saddr.sin_addr = dst;
|
|
|
|
|
2007-01-22 14:12:08 +00:00
|
|
|
if (setsockopt(probe_fd, SOL_SOCKET, SO_DONTROUTE, &const_int_1, sizeof(const_int_1)) == -1)
|
2006-09-23 12:46:30 +00:00
|
|
|
bb_perror_msg("warning: setsockopt(SO_DONTROUTE)");
|
2006-12-23 02:48:44 +00:00
|
|
|
xconnect(probe_fd, (struct sockaddr *) &saddr, sizeof(saddr));
|
|
|
|
if (getsockname(probe_fd, (struct sockaddr *) &saddr, &alen) == -1) {
|
2006-03-30 21:50:57 +00:00
|
|
|
bb_error_msg_and_die("getsockname");
|
2003-01-09 10:06:01 +00:00
|
|
|
}
|
|
|
|
src = saddr.sin_addr;
|
|
|
|
}
|
|
|
|
close(probe_fd);
|
2006-12-23 02:48:44 +00:00
|
|
|
}
|
2003-01-09 10:06:01 +00:00
|
|
|
|
|
|
|
me.sll_family = AF_PACKET;
|
|
|
|
me.sll_ifindex = ifindex;
|
|
|
|
me.sll_protocol = htons(ETH_P_ARP);
|
2006-12-23 02:48:44 +00:00
|
|
|
xbind(s, (struct sockaddr *) &me, sizeof(me));
|
2003-01-09 10:06:01 +00:00
|
|
|
|
2003-02-09 07:01:33 +00:00
|
|
|
{
|
2006-01-30 22:30:41 +00:00
|
|
|
socklen_t alen = sizeof(me);
|
2003-01-09 10:06:01 +00:00
|
|
|
|
|
|
|
if (getsockname(s, (struct sockaddr *) &me, &alen) == -1) {
|
2006-03-30 21:50:57 +00:00
|
|
|
bb_error_msg_and_die("getsockname");
|
2003-01-09 10:06:01 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
if (me.sll_halen == 0) {
|
2006-10-20 13:28:22 +00:00
|
|
|
bb_error_msg("interface \"%s\" is not ARPable (no ll address)", device);
|
2006-12-23 02:48:44 +00:00
|
|
|
return (cfg & dad ? 0 : 2);
|
2003-01-09 10:06:01 +00:00
|
|
|
}
|
|
|
|
he = me;
|
|
|
|
memset(he.sll_addr, -1, he.sll_halen);
|
|
|
|
|
2006-12-23 02:48:44 +00:00
|
|
|
if (!(cfg & quiet)) {
|
2006-04-03 12:29:12 +00:00
|
|
|
printf("ARPING to %s from %s via %s\n",
|
|
|
|
inet_ntoa(dst), inet_ntoa(src),
|
|
|
|
device ? device : "unknown");
|
2003-02-09 07:01:33 +00:00
|
|
|
}
|
2003-01-09 10:06:01 +00:00
|
|
|
|
2006-12-23 02:48:44 +00:00
|
|
|
if (!src.s_addr && !(cfg & dad)) {
|
2006-03-30 21:50:57 +00:00
|
|
|
bb_error_msg_and_die("no src address in the non-DAD mode");
|
2003-01-09 10:06:01 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
{
|
|
|
|
struct sigaction sa;
|
2003-01-19 13:31:41 +00:00
|
|
|
|
2003-01-09 10:06:01 +00:00
|
|
|
memset(&sa, 0, sizeof(sa));
|
|
|
|
sa.sa_flags = SA_RESTART;
|
|
|
|
|
|
|
|
sa.sa_handler = (void (*)(int)) finish;
|
|
|
|
sigaction(SIGINT, &sa, NULL);
|
|
|
|
|
|
|
|
sa.sa_handler = (void (*)(int)) catcher;
|
|
|
|
sigaction(SIGALRM, &sa, NULL);
|
|
|
|
}
|
|
|
|
|
|
|
|
catcher();
|
|
|
|
|
|
|
|
while (1) {
|
|
|
|
sigset_t sset, osset;
|
2006-03-31 18:13:42 +00:00
|
|
|
RESERVE_CONFIG_UBUFFER(packet, 4096);
|
2003-01-09 10:06:01 +00:00
|
|
|
struct sockaddr_ll from;
|
2006-01-30 22:30:41 +00:00
|
|
|
socklen_t alen = sizeof(from);
|
2003-01-09 10:06:01 +00:00
|
|
|
int cc;
|
|
|
|
|
2006-12-23 02:48:44 +00:00
|
|
|
cc = recvfrom(s, packet, 4096, 0, (struct sockaddr *) &from, &alen);
|
|
|
|
if (cc < 0) {
|
2006-09-23 12:46:30 +00:00
|
|
|
bb_perror_msg("recvfrom");
|
2003-01-09 10:06:01 +00:00
|
|
|
continue;
|
|
|
|
}
|
|
|
|
sigemptyset(&sset);
|
|
|
|
sigaddset(&sset, SIGALRM);
|
|
|
|
sigaddset(&sset, SIGINT);
|
|
|
|
sigprocmask(SIG_BLOCK, &sset, &osset);
|
|
|
|
recv_pack(packet, cc, &from);
|
|
|
|
sigprocmask(SIG_SETMASK, &osset, NULL);
|
2006-03-31 18:13:42 +00:00
|
|
|
RELEASE_CONFIG_BUFFER(packet);
|
2003-01-09 10:06:01 +00:00
|
|
|
}
|
|
|
|
}
|