[821] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * arping.c - Ping hosts by ARP requests/replies
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| 4 | *
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| 5 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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| 6 | *
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| 7 | * Author: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
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| 8 | * Busybox port: Nick Fedchik <nick@fedchik.org.ua>
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| 9 | */
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| 10 |
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| 11 | #include <sys/ioctl.h>
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| 12 | #include <signal.h>
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| 13 |
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| 14 | #include <errno.h>
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| 15 | #include <stdlib.h>
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| 16 | #include <string.h>
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| 17 | #include <unistd.h>
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| 18 |
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| 19 | #include <arpa/inet.h>
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| 20 | #include <net/if.h>
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| 21 | #include <netinet/ether.h>
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| 22 | #include <netpacket/packet.h>
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| 23 |
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| 24 | #include "busybox.h"
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| 25 |
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| 26 | static struct in_addr src;
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| 27 | static struct in_addr dst;
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| 28 | static struct sockaddr_ll me;
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| 29 | static struct sockaddr_ll he;
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| 30 | static struct timeval last;
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| 31 |
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| 32 | enum cfg_e {
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| 33 | dad = 1,
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| 34 | unsolicited = 2,
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| 35 | advert = 4,
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| 36 | quiet = 8,
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| 37 | quit_on_reply = 16,
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| 38 | broadcast_only = 32,
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| 39 | unicasting = 64
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| 40 | };
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| 41 | static int cfg;
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| 42 |
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| 43 | static int s;
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| 44 | static int count = -1;
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| 45 | static int timeout;
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| 46 | static int sent;
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| 47 | static int brd_sent;
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| 48 | static int received;
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| 49 | static int brd_recv;
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| 50 | static int req_recv;
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| 51 |
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| 52 |
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| 53 | #define MS_TDIFF(tv1,tv2) ( ((tv1).tv_sec-(tv2).tv_sec)*1000 + \
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| 54 | ((tv1).tv_usec-(tv2).tv_usec)/1000 )
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| 55 | #if 0
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| 56 | static void set_signal(int signo, void (*handler) (void))
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| 57 | {
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| 58 | struct sigaction sa;
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| 59 |
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| 60 | memset(&sa, 0, sizeof(sa));
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| 61 | sa.sa_handler = (void (*)(int)) handler;
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| 62 | sa.sa_flags = SA_RESTART;
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| 63 | sigaction(signo, &sa, NULL);
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| 64 | }
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| 65 | #endif
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| 66 |
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| 67 | static int send_pack(int sock, struct in_addr *src_addr,
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| 68 | struct in_addr *dst_addr, struct sockaddr_ll *ME,
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| 69 | struct sockaddr_ll *HE)
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| 70 | {
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| 71 | int err;
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| 72 | struct timeval now;
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| 73 | RESERVE_CONFIG_UBUFFER(buf, 256);
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| 74 | struct arphdr *ah = (struct arphdr *) buf;
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| 75 | unsigned char *p = (unsigned char *) (ah + 1);
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| 76 |
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| 77 | ah->ar_hrd = htons(ME->sll_hatype);
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| 78 | ah->ar_hrd = htons(ARPHRD_ETHER);
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| 79 | ah->ar_pro = htons(ETH_P_IP);
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| 80 | ah->ar_hln = ME->sll_halen;
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| 81 | ah->ar_pln = 4;
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| 82 | ah->ar_op = cfg&advert ? htons(ARPOP_REPLY) : htons(ARPOP_REQUEST);
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| 83 |
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| 84 | memcpy(p, &ME->sll_addr, ah->ar_hln);
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| 85 | p += ME->sll_halen;
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| 86 |
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| 87 | memcpy(p, src_addr, 4);
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| 88 | p += 4;
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| 89 |
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| 90 | if (cfg&advert)
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| 91 | memcpy(p, &ME->sll_addr, ah->ar_hln);
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| 92 | else
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| 93 | memcpy(p, &HE->sll_addr, ah->ar_hln);
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| 94 | p += ah->ar_hln;
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| 95 |
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| 96 | memcpy(p, dst_addr, 4);
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| 97 | p += 4;
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| 98 |
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| 99 | gettimeofday(&now, NULL);
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| 100 | err = sendto(sock, buf, p - buf, 0, (struct sockaddr *) HE, sizeof(*HE));
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| 101 | if (err == p - buf) {
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| 102 | last = now;
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| 103 | sent++;
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| 104 | if (!(cfg&unicasting))
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| 105 | brd_sent++;
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| 106 | }
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| 107 | RELEASE_CONFIG_BUFFER(buf);
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| 108 | return err;
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| 109 | }
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| 110 |
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| 111 | static void finish(void)
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| 112 | {
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| 113 | if (!(cfg&quiet)) {
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| 114 | printf("Sent %d probes (%d broadcast(s))\n"
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| 115 | "Received %d repl%s",
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| 116 | sent, brd_sent,
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| 117 | received, (received > 1) ? "ies" : "y");
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| 118 | if (brd_recv || req_recv) {
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| 119 | printf(" (");
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| 120 | if (req_recv)
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| 121 | printf("%d request(s)", req_recv);
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| 122 | if (brd_recv)
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| 123 | printf("%s%d broadcast(s)", req_recv ? ", " : "", brd_recv);
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| 124 | putchar(')');
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| 125 | }
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| 126 | putchar('\n');
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| 127 | fflush(stdout);
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| 128 | }
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| 129 | if (cfg&dad)
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| 130 | exit(!!received);
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| 131 | if (cfg&unsolicited)
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| 132 | exit(0);
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| 133 | exit(!received);
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| 134 | }
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| 135 |
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| 136 | static void catcher(void)
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| 137 | {
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| 138 | struct timeval tv;
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| 139 | static struct timeval start;
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| 140 |
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| 141 | gettimeofday(&tv, NULL);
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| 142 |
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| 143 | if (start.tv_sec == 0)
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| 144 | start = tv;
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| 145 |
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| 146 | if (count-- == 0
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| 147 | || (timeout && MS_TDIFF(tv, start) > timeout * 1000 + 500))
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| 148 | finish();
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| 149 |
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| 150 | if (last.tv_sec == 0 || MS_TDIFF(tv, last) > 500) {
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| 151 | send_pack(s, &src, &dst, &me, &he);
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| 152 | if (count == 0 && cfg&unsolicited)
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| 153 | finish();
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| 154 | }
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| 155 | alarm(1);
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| 156 | }
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| 157 |
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| 158 | static int recv_pack(unsigned char *buf, int len, struct sockaddr_ll *FROM)
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| 159 | {
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| 160 | struct arphdr *ah = (struct arphdr *) buf;
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| 161 | unsigned char *p = (unsigned char *) (ah + 1);
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| 162 | struct in_addr src_ip, dst_ip;
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| 163 |
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| 164 | /* Filter out wild packets */
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| 165 | if (FROM->sll_pkttype != PACKET_HOST &&
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| 166 | FROM->sll_pkttype != PACKET_BROADCAST &&
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| 167 | FROM->sll_pkttype != PACKET_MULTICAST)
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| 168 | return 0;
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| 169 |
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| 170 | /* Only these types are recognised */
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| 171 | if (ah->ar_op != htons(ARPOP_REQUEST) && ah->ar_op != htons(ARPOP_REPLY))
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| 172 | return 0;
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| 173 |
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| 174 | /* ARPHRD check and this darned FDDI hack here :-( */
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| 175 | if (ah->ar_hrd != htons(FROM->sll_hatype) &&
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| 176 | (FROM->sll_hatype != ARPHRD_FDDI
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| 177 | || ah->ar_hrd != htons(ARPHRD_ETHER)))
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| 178 | return 0;
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| 179 |
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| 180 | /* Protocol must be IP. */
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| 181 | if (ah->ar_pro != htons(ETH_P_IP))
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| 182 | return 0;
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| 183 | if (ah->ar_pln != 4)
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| 184 | return 0;
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| 185 | if (ah->ar_hln != me.sll_halen)
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| 186 | return 0;
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| 187 | if (len < sizeof(*ah) + 2 * (4 + ah->ar_hln))
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| 188 | return 0;
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| 189 | memcpy(&src_ip, p + ah->ar_hln, 4);
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| 190 | memcpy(&dst_ip, p + ah->ar_hln + 4 + ah->ar_hln, 4);
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| 191 | if (!(cfg&dad)) {
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| 192 | if (src_ip.s_addr != dst.s_addr)
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| 193 | return 0;
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| 194 | if (src.s_addr != dst_ip.s_addr)
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| 195 | return 0;
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| 196 | if (memcmp(p + ah->ar_hln + 4, &me.sll_addr, ah->ar_hln))
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| 197 | return 0;
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| 198 | } else {
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| 199 | /* DAD packet was:
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| 200 | src_ip = 0 (or some src)
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| 201 | src_hw = ME
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| 202 | dst_ip = tested address
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| 203 | dst_hw = <unspec>
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| 204 |
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| 205 | We fail, if receive request/reply with:
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| 206 | src_ip = tested_address
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| 207 | src_hw != ME
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| 208 | if src_ip in request was not zero, check
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| 209 | also that it matches to dst_ip, otherwise
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| 210 | dst_ip/dst_hw do not matter.
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| 211 | */
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| 212 | if (src_ip.s_addr != dst.s_addr)
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| 213 | return 0;
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| 214 | if (memcmp(p, &me.sll_addr, me.sll_halen) == 0)
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| 215 | return 0;
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| 216 | if (src.s_addr && src.s_addr != dst_ip.s_addr)
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| 217 | return 0;
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| 218 | }
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| 219 | if (!(cfg&quiet)) {
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| 220 | int s_printed = 0;
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| 221 | struct timeval tv;
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| 222 |
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| 223 | gettimeofday(&tv, NULL);
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| 224 |
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| 225 | printf("%s %s from %s [%s]",
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| 226 | FROM->sll_pkttype == PACKET_HOST ? "Unicast" : "Broadcast",
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| 227 | ah->ar_op == htons(ARPOP_REPLY) ? "reply" : "request",
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| 228 | inet_ntoa(src_ip),
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| 229 | ether_ntoa((struct ether_addr *) p));
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| 230 | if (dst_ip.s_addr != src.s_addr) {
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| 231 | printf("for %s ", inet_ntoa(dst_ip));
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| 232 | s_printed = 1;
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| 233 | }
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| 234 | if (memcmp(p + ah->ar_hln + 4, me.sll_addr, ah->ar_hln)) {
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| 235 | if (!s_printed)
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| 236 | printf("for ");
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| 237 | printf("[%s]",
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| 238 | ether_ntoa((struct ether_addr *) p + ah->ar_hln + 4));
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| 239 | }
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| 240 |
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| 241 | if (last.tv_sec) {
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| 242 | long usecs = (tv.tv_sec - last.tv_sec) * 1000000 +
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| 243 | tv.tv_usec - last.tv_usec;
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| 244 | long msecs = (usecs + 500) / 1000;
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| 245 |
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| 246 | usecs -= msecs * 1000 - 500;
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| 247 | printf(" %ld.%03ldms\n", msecs, usecs);
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| 248 | } else {
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| 249 | printf(" UNSOLICITED?\n");
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| 250 | }
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| 251 | fflush(stdout);
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| 252 | }
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| 253 | received++;
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| 254 | if (FROM->sll_pkttype != PACKET_HOST)
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| 255 | brd_recv++;
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| 256 | if (ah->ar_op == htons(ARPOP_REQUEST))
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| 257 | req_recv++;
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| 258 | if (cfg&quit_on_reply)
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| 259 | finish();
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| 260 | if (!(cfg&broadcast_only)) {
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| 261 | memcpy(he.sll_addr, p, me.sll_halen);
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| 262 | cfg |= unicasting;
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| 263 | }
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| 264 | return 1;
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| 265 | }
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| 266 |
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| 267 | int arping_main(int argc, char **argv)
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| 268 | {
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| 269 | char *device = "eth0";
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| 270 | int ifindex;
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| 271 | char *source = NULL;
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| 272 | char *target;
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| 273 |
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| 274 | s = socket(PF_PACKET, SOCK_DGRAM, 0);
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| 275 | ifindex = errno;
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| 276 |
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| 277 | // Drop suid root privileges
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| 278 | xsetuid(getuid());
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| 279 |
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| 280 | {
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| 281 | unsigned long opt;
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| 282 | char *_count, *_timeout, *_device;
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| 283 |
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| 284 | /* Dad also sets quit_on_reply.
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| 285 | * Advert also sets unsolicited.
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| 286 | */
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| 287 | bb_opt_complementally = "Df:AU";
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| 288 | opt = bb_getopt_ulflags(argc, argv, "DUAqfbc:w:i:s:",
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| 289 | &_count, &_timeout, &_device);
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| 290 | cfg |= opt & 63; /* set respective flags */
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| 291 | if (opt & 64) /* count */
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| 292 | count = atoi(_count);
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| 293 | if (opt & 128) /* timeout */
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| 294 | timeout = atoi(_timeout);
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| 295 | if (opt & 256) { /* interface */
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| 296 | if (strlen(_device) > IF_NAMESIZE) {
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| 297 | bb_error_msg_and_die("Interface name `%s' must be less than %d",
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| 298 | _device, IF_NAMESIZE);
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| 299 | }
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| 300 | device = _device;
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| 301 | }
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| 302 | if (opt & 512) /* source */
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| 303 | source = optarg;
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| 304 | }
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| 305 | argc -= optind;
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| 306 | argv += optind;
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| 307 |
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| 308 | if (argc != 1)
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| 309 | bb_show_usage();
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| 310 |
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| 311 | target = *argv;
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| 312 |
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| 313 |
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| 314 | if (s < 0) {
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| 315 | bb_default_error_retval = ifindex;
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| 316 | bb_perror_msg_and_die("socket");
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| 317 | }
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| 318 | bb_default_error_retval = 2;
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| 319 |
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| 320 | {
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| 321 | struct ifreq ifr;
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| 322 |
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| 323 | memset(&ifr, 0, sizeof(ifr));
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| 324 | strncpy(ifr.ifr_name, device, IFNAMSIZ - 1);
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| 325 | if (ioctl(s, SIOCGIFINDEX, &ifr) < 0) {
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| 326 | bb_error_msg_and_die("Interface %s not found", device);
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| 327 | }
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| 328 | ifindex = ifr.ifr_ifindex;
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| 329 |
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| 330 | if (ioctl(s, SIOCGIFFLAGS, (char *) &ifr)) {
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| 331 | bb_error_msg_and_die("SIOCGIFFLAGS");
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| 332 | }
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| 333 | if (!(ifr.ifr_flags & IFF_UP)) {
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| 334 | bb_error_msg_and_die("Interface %s is down", device);
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| 335 | }
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| 336 | if (ifr.ifr_flags & (IFF_NOARP | IFF_LOOPBACK)) {
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| 337 | bb_error_msg("Interface %s is not ARPable", device);
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| 338 | exit(cfg&dad ? 0 : 2);
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| 339 | }
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| 340 | }
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| 341 |
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| 342 | if (!inet_aton(target, &dst)) {
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| 343 | struct hostent *hp;
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| 344 |
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| 345 | hp = gethostbyname2(target, AF_INET);
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| 346 | if (!hp) {
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| 347 | bb_error_msg_and_die("invalid or unknown target %s", target);
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| 348 | }
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| 349 | memcpy(&dst, hp->h_addr, 4);
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| 350 | }
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| 351 |
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| 352 | if (source && !inet_aton(source, &src)) {
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| 353 | bb_error_msg_and_die("invalid source address %s", source);
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| 354 | }
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| 355 |
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| 356 | if (!(cfg&dad) && cfg&unsolicited && src.s_addr == 0)
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| 357 | src = dst;
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| 358 |
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| 359 | if (!(cfg&dad) || src.s_addr) {
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| 360 | struct sockaddr_in saddr;
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| 361 | int probe_fd = socket(AF_INET, SOCK_DGRAM, 0); /* maybe use bb_xsocket? */
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| 362 |
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| 363 | if (probe_fd < 0) {
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| 364 | bb_error_msg_and_die("socket");
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| 365 | }
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| 366 | if (device) {
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| 367 | if (setsockopt
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| 368 | (probe_fd, SOL_SOCKET, SO_BINDTODEVICE, device,
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| 369 | strlen(device) + 1) == -1)
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| 370 | bb_error_msg("WARNING: interface %s is ignored", device);
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| 371 | }
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| 372 | memset(&saddr, 0, sizeof(saddr));
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| 373 | saddr.sin_family = AF_INET;
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| 374 | if (src.s_addr) {
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| 375 | saddr.sin_addr = src;
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| 376 | if (bind(probe_fd, (struct sockaddr *) &saddr, sizeof(saddr)) == -1) {
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| 377 | bb_error_msg_and_die("bind");
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| 378 | }
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| 379 | } else if (!(cfg&dad)) {
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| 380 | int on = 1;
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| 381 | socklen_t alen = sizeof(saddr);
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| 382 |
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| 383 | saddr.sin_port = htons(1025);
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| 384 | saddr.sin_addr = dst;
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| 385 |
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| 386 | if (setsockopt
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| 387 | (probe_fd, SOL_SOCKET, SO_DONTROUTE, (char *) &on,
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| 388 | sizeof(on)) == -1)
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| 389 | bb_perror_msg("WARNING: setsockopt(SO_DONTROUTE)");
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| 390 | if (connect(probe_fd, (struct sockaddr *) &saddr, sizeof(saddr))
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| 391 | == -1) {
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| 392 | bb_error_msg_and_die("connect");
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| 393 | }
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| 394 | if (getsockname(probe_fd, (struct sockaddr *) &saddr, &alen) ==
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| 395 | -1) {
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| 396 | bb_error_msg_and_die("getsockname");
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| 397 | }
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| 398 | src = saddr.sin_addr;
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| 399 | }
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| 400 | close(probe_fd);
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| 401 | };
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| 402 |
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| 403 | me.sll_family = AF_PACKET;
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| 404 | me.sll_ifindex = ifindex;
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| 405 | me.sll_protocol = htons(ETH_P_ARP);
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| 406 | if (bind(s, (struct sockaddr *) &me, sizeof(me)) == -1) {
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| 407 | bb_error_msg_and_die("bind");
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| 408 | }
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| 409 |
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| 410 | {
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| 411 | socklen_t alen = sizeof(me);
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| 412 |
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| 413 | if (getsockname(s, (struct sockaddr *) &me, &alen) == -1) {
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| 414 | bb_error_msg_and_die("getsockname");
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| 415 | }
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| 416 | }
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| 417 | if (me.sll_halen == 0) {
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| 418 | bb_error_msg("Interface \"%s\" is not ARPable (no ll address)", device);
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| 419 | exit(cfg&dad ? 0 : 2);
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| 420 | }
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| 421 | he = me;
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| 422 | memset(he.sll_addr, -1, he.sll_halen);
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| 423 |
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| 424 | if (!(cfg&quiet)) {
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| 425 | printf("ARPING to %s from %s via %s\n",
|
---|
| 426 | inet_ntoa(dst), inet_ntoa(src),
|
---|
| 427 | device ? device : "unknown");
|
---|
| 428 | }
|
---|
| 429 |
|
---|
| 430 | if (!src.s_addr && !(cfg&dad)) {
|
---|
| 431 | bb_error_msg_and_die("no src address in the non-DAD mode");
|
---|
| 432 | }
|
---|
| 433 |
|
---|
| 434 | {
|
---|
| 435 | struct sigaction sa;
|
---|
| 436 |
|
---|
| 437 | memset(&sa, 0, sizeof(sa));
|
---|
| 438 | sa.sa_flags = SA_RESTART;
|
---|
| 439 |
|
---|
| 440 | sa.sa_handler = (void (*)(int)) finish;
|
---|
| 441 | sigaction(SIGINT, &sa, NULL);
|
---|
| 442 |
|
---|
| 443 | sa.sa_handler = (void (*)(int)) catcher;
|
---|
| 444 | sigaction(SIGALRM, &sa, NULL);
|
---|
| 445 | }
|
---|
| 446 |
|
---|
| 447 | catcher();
|
---|
| 448 |
|
---|
| 449 | while (1) {
|
---|
| 450 | sigset_t sset, osset;
|
---|
| 451 | RESERVE_CONFIG_UBUFFER(packet, 4096);
|
---|
| 452 | struct sockaddr_ll from;
|
---|
| 453 | socklen_t alen = sizeof(from);
|
---|
| 454 | int cc;
|
---|
| 455 |
|
---|
| 456 | if ((cc = recvfrom(s, packet, 4096, 0,
|
---|
| 457 | (struct sockaddr *) &from, &alen)) < 0) {
|
---|
| 458 | perror("recvfrom");
|
---|
| 459 | continue;
|
---|
| 460 | }
|
---|
| 461 | sigemptyset(&sset);
|
---|
| 462 | sigaddset(&sset, SIGALRM);
|
---|
| 463 | sigaddset(&sset, SIGINT);
|
---|
| 464 | sigprocmask(SIG_BLOCK, &sset, &osset);
|
---|
| 465 | recv_pack(packet, cc, &from);
|
---|
| 466 | sigprocmask(SIG_SETMASK, &osset, NULL);
|
---|
| 467 | RELEASE_CONFIG_BUFFER(packet);
|
---|
| 468 | }
|
---|
| 469 | }
|
---|