arping applet by Nick Fedchik
This commit is contained in:
Glenn L McGrath
parent
dd3461af2f
commit
9e59841375
@ -58,6 +58,9 @@
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#ifdef CONFIG_AR
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APPLET(ar, ar_main, _BB_DIR_USR_BIN, _BB_SUID_NEVER)
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#endif
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#ifdef CONFIG_ARPING
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APPLET(arping, arping_main, _BB_DIR_USR_BIN, _BB_SUID_NEVER)
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#endif
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#ifdef CONFIG_ASH
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APPLET_NOUSAGE("ash", ash_main, _BB_DIR_BIN, _BB_SUID_NEVER)
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#endif
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@ -38,6 +38,23 @@
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"\t-x\t\textract\n" \
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"\t-v\t\tverbosely list files processed\n"
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#define arping_trivial_usage \
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"[-fqbDUA] [-c count] [-w timeout] [-I device] [-s sender] target\n"
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#define arping_full_usage \
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"Ping hosts by ARP requests/replies.\n\n" \
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"Options:\n" \
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"\t-f\t\tQuit on first ARP reply\n" \
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"\t-q\t\tBe quiet\n" \
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"\t-b\t\tKeep broadcasting, don't go unicast\n" \
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"\t-D\t\tDuplicated address detection mode\n" \
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"\t-U\t\tUnsolicited ARP mode, update your neighbours\n" \
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"\t-A\t\tARP answer mode, update your neighbours\n" \
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"\t-c count\tStop after sending count ARP request packets\n" \
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"\t-w timeout\tTime to wait for ARP reply, in seconds\n" \
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"\t-I device\tOutgoing interface name, default is eth0\n" \
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"\t-s sender\tSet specific sender IP address\n" \
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"\ttarget\t\tTarget IP address of ARP request\n"
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#define awk_trivial_usage \
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"[-v var=val][-F sep] { -f progname | 'programtext' } [FILE ...]"
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#define awk_full_usage \
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@ -11,6 +11,12 @@ config CONFIG_FEATURE_IPV6
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help
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Please submit a patch to add help text for this item.
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config CONFIG_ARPING
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bool "arping"
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default n
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help
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Ping hosts by ARP packets
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config CONFIG_FTPGET
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bool "ftpget"
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default n
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@ -23,6 +23,7 @@ NETWORKING_DIR:=$(TOPDIR)networking/
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endif
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NETWORKING-y:=
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NETWORKING-$(CONFIG_ARPING) += arping.o
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NETWORKING-$(CONFIG_FTPGET) += ftpgetput.o
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NETWORKING-$(CONFIG_FTPPUT) += ftpgetput.o
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NETWORKING-$(CONFIG_HOSTNAME) += hostname.o
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492
networking/arping.c
Normal file
492
networking/arping.c
Normal file
@ -0,0 +1,492 @@
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/*
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* arping.c - Ping hosts by ARP requests/replies
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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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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#include <sys/signal.h>
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#include <sys/time.h>
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#include <errno.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 <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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#include "busybox.h"
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#define APPLET_NAME "arping"
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struct in_addr src;
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struct in_addr dst;
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struct sockaddr_ll me;
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struct sockaddr_ll he;
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struct timeval last;
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int dad;
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int unsolicited;
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int advert;
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int quiet;
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int quit_on_reply = 0;
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int count = -1;
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int timeout;
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int unicasting;
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int s;
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int broadcast_only;
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int sent;
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int brd_sent;
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int received;
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int brd_recv;
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int req_recv;
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#define MS_TDIFF(tv1,tv2) ( ((tv1).tv_sec-(tv2).tv_sec)*1000 + \
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((tv1).tv_usec-(tv2).tv_usec)/1000 )
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#if 0
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static void set_signal(int signo, void (*handler) (void))
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{
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struct sigaction sa;
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memset(&sa, 0, sizeof(sa));
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sa.sa_handler = (void (*)(int)) handler;
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sa.sa_flags = SA_RESTART;
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sigaction(signo, &sa, NULL);
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}
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#endif
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static int send_pack(int sock, struct in_addr *src_addr, struct in_addr *dst_addr,
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struct sockaddr_ll *ME, struct sockaddr_ll *HE)
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{
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int err;
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struct timeval now;
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unsigned char buf[256];
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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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ah->ar_op = advert ? htons(ARPOP_REPLY) : htons(ARPOP_REQUEST);
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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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if (advert)
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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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if (!unicasting)
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brd_sent++;
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}
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return err;
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}
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void finish(void)
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{
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if (!quiet) {
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printf("Sent %d probes (%d broadcast(s))\n", sent, brd_sent);
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printf("Received %d repl%s", received, (received > 1) ? "ies" : "y");
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if (brd_recv || req_recv) {
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printf(" (");
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if (req_recv)
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printf("%d request(s)", req_recv);
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if (brd_recv)
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printf("%s%d broadcast(s)", req_recv ? ", " : "", brd_recv);
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putchar(')');
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}
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putchar('\n');
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fflush(stdout);
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}
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if (dad)
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exit(!!received);
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if (unsolicited)
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exit(0);
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exit(!received);
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}
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void catcher(void)
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{
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struct timeval tv;
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struct timeval start;
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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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|| (timeout && MS_TDIFF(tv, start) > timeout * 1000 + 500))
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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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if (count == 0 && unsolicited)
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finish();
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}
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alarm(1);
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}
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int recv_pack(unsigned char *buf, int len, struct sockaddr_ll *FROM)
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{
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struct timeval tv;
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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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gettimeofday(&tv, NULL);
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/* Filter out wild packets */
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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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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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if (ah->ar_hrd != htons(FROM->sll_hatype) &&
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(FROM->sll_hatype != ARPHRD_FDDI
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|| ah->ar_hrd != htons(ARPHRD_ETHER)))
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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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if (!dad) {
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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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if (!quiet) {
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int s_printed = 0;
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printf("%s ",
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FROM->sll_pkttype == PACKET_HOST ? "Unicast" : "Broadcast");
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printf("%s from ",
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ah->ar_op == htons(ARPOP_REPLY) ? "reply" : "request");
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printf("%s ", inet_ntoa(src_ip));
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printf("[%s]", ether_ntoa((struct ether_addr *) p));
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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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ether_ntoa((struct ether_addr *) p + ah->ar_hln + 4));
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}
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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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if (quit_on_reply)
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finish();
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if (!broadcast_only) {
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memcpy(he.sll_addr, p, me.sll_halen);
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unicasting = 1;
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}
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return 1;
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}
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int arping_main(int argc, char **argv)
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{
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int socket_errno;
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int ch;
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uid_t uid = getuid();
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char *device = "eth0";
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int ifindex = 0;
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char *source = NULL;
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char *target;
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s = socket(PF_PACKET, SOCK_DGRAM, 0);
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socket_errno = errno;
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setuid(uid);
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while ((ch = getopt(argc, argv, "h?bfDUAqc:w:s:I")) != EOF) {
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switch (ch) {
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case 'b':
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broadcast_only = 1;
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break;
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case 'D':
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dad++;
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quit_on_reply = 1;
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break;
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case 'U':
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unsolicited++;
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break;
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case 'A':
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advert++;
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unsolicited++;
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break;
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case 'q':
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quiet++;
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break;
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case 'c':
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count = atoi(optarg);
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break;
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case 'w':
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timeout = atoi(optarg);
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break;
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case 'I':
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device = optarg;
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break;
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case 'f':
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quit_on_reply = 1;
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break;
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case 's':
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source = optarg;
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break;
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case 'h':
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case '?':
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default:
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show_usage();
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}
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}
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argc -= optind;
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argv += optind;
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if (argc != 1)
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show_usage();
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target = *argv;
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if (device == NULL) {
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error_msg("-I <interface> is required!");
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exit(1);
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}
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if (s < 0) {
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error_msg("socket");
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exit(socket_errno);
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}
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if (1) {
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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) {
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error_msg("unknown interface %s", device);
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exit(2);
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}
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ifindex = ifr.ifr_ifindex;
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if (ioctl(s, SIOCGIFFLAGS, (char *) &ifr)) {
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error_msg("SIOCGIFFLAGS");
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exit(2);
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}
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if (!(ifr.ifr_flags & IFF_UP)) {
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error_msg("Interface \"%s\" is down", device);
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exit(2);
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}
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if (ifr.ifr_flags & (IFF_NOARP | IFF_LOOPBACK)) {
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error_msg("Interface \"%s\" is not ARPable", device);
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exit(dad ? 0 : 2);
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}
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}
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if (inet_aton(target, &dst) != 1) {
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struct hostent *hp;
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hp = gethostbyname2(target, AF_INET);
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if (!hp) {
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error_msg("invalid or unknown target %s", target);
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exit(2);
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}
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memcpy(&dst, hp->h_addr, 4);
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}
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if (source && inet_aton(source, &src) != 1) {
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error_msg("invalid source address %s", source);
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exit(2);
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}
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if (!dad && unsolicited && src.s_addr == 0)
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src = dst;
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if (!dad || src.s_addr) {
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struct sockaddr_in saddr;
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int probe_fd = socket(AF_INET, SOCK_DGRAM, 0);
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if (probe_fd < 0) {
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error_msg("socket");
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exit(2);
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}
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if (device) {
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if (setsockopt
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(probe_fd, SOL_SOCKET, SO_BINDTODEVICE, device,
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strlen(device) + 1) == -1)
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perror("WARNING: interface is ignored");
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}
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memset(&saddr, 0, sizeof(saddr));
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saddr.sin_family = AF_INET;
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if (src.s_addr) {
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saddr.sin_addr = src;
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if (bind(probe_fd, (struct sockaddr *) &saddr, sizeof(saddr)) == -1) {
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error_msg("bind");
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exit(2);
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}
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} else if (!dad) {
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int on = 1;
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int alen = sizeof(saddr);
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saddr.sin_port = htons(1025);
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saddr.sin_addr = dst;
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if (setsockopt
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(probe_fd, SOL_SOCKET, SO_DONTROUTE, (char *) &on,
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sizeof(on)) == -1)
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perror("WARNING: setsockopt(SO_DONTROUTE)");
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if (connect(probe_fd, (struct sockaddr *) &saddr, sizeof(saddr))
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== -1) {
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error_msg("connect");
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exit(2);
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}
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if (getsockname(probe_fd, (struct sockaddr *) &saddr, &alen) ==
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-1) {
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error_msg("getsockname");
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exit(2);
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}
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src = saddr.sin_addr;
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}
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close(probe_fd);
|
||||
};
|
||||
|
||||
me.sll_family = AF_PACKET;
|
||||
me.sll_ifindex = ifindex;
|
||||
me.sll_protocol = htons(ETH_P_ARP);
|
||||
if (bind(s, (struct sockaddr *) &me, sizeof(me)) == -1) {
|
||||
error_msg("bind");
|
||||
exit(2);
|
||||
}
|
||||
|
||||
if (1) {
|
||||
int alen = sizeof(me);
|
||||
|
||||
if (getsockname(s, (struct sockaddr *) &me, &alen) == -1) {
|
||||
error_msg("getsockname");
|
||||
exit(2);
|
||||
}
|
||||
}
|
||||
if (me.sll_halen == 0) {
|
||||
error_msg("Interface \"%s\" is not ARPable (no ll address)", device);
|
||||
exit(dad ? 0 : 2);
|
||||
}
|
||||
he = me;
|
||||
memset(he.sll_addr, -1, he.sll_halen);
|
||||
|
||||
if (!quiet)
|
||||
printf("ARPING to %s from %s via %s\n", inet_ntoa(dst),
|
||||
inet_ntoa(src), device ? device : "unknown");
|
||||
|
||||
if (!src.s_addr && !dad) {
|
||||
error_msg("no src address in the non-DAD mode");
|
||||
exit(2);
|
||||
}
|
||||
|
||||
{
|
||||
struct sigaction sa;
|
||||
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;
|
||||
char packet[4096];
|
||||
struct sockaddr_ll from;
|
||||
int alen = sizeof(from);
|
||||
int cc;
|
||||
|
||||
if ((cc = recvfrom(s, packet, sizeof(packet), 0,
|
||||
(struct sockaddr *) &from, &alen)) < 0) {
|
||||
perror("recvfrom");
|
||||
continue;
|
||||
}
|
||||
sigemptyset(&sset);
|
||||
sigaddset(&sset, SIGALRM);
|
||||
sigaddset(&sset, SIGINT);
|
||||
sigprocmask(SIG_BLOCK, &sset, &osset);
|
||||
recv_pack(packet, cc, &from);
|
||||
sigprocmask(SIG_SETMASK, &osset, NULL);
|
||||
}
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user