[821] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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[2725] | 3 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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[821] | 4 | *
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[2725] | 5 | * Author: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
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[821] | 6 | * Busybox port: Nick Fedchik <nick@fedchik.org.ua>
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| 7 | */
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| 8 |
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[3232] | 9 | //usage:#define arping_trivial_usage
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| 10 | //usage: "[-fqbDUA] [-c CNT] [-w TIMEOUT] [-I IFACE] [-s SRC_IP] DST_IP"
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| 11 | //usage:#define arping_full_usage "\n\n"
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| 12 | //usage: "Send ARP requests/replies\n"
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| 13 | //usage: "\n -f Quit on first ARP reply"
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| 14 | //usage: "\n -q Quiet"
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| 15 | //usage: "\n -b Keep broadcasting, don't go unicast"
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| 16 | //usage: "\n -D Duplicated address detection mode"
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| 17 | //usage: "\n -U Unsolicited ARP mode, update your neighbors"
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| 18 | //usage: "\n -A ARP answer mode, update your neighbors"
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| 19 | //usage: "\n -c N Stop after sending N ARP requests"
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| 20 | //usage: "\n -w TIMEOUT Time to wait for ARP reply, seconds"
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| 21 | //usage: "\n -I IFACE Interface to use (default eth0)"
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| 22 | //usage: "\n -s SRC_IP Sender IP address"
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| 23 | //usage: "\n DST_IP Target IP address"
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| 24 |
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[821] | 25 | #include <arpa/inet.h>
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| 26 | #include <net/if.h>
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| 27 | #include <netinet/ether.h>
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| 28 | #include <netpacket/packet.h>
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| 29 |
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[1765] | 30 | #include "libbb.h"
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[821] | 31 |
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[1765] | 32 | /* We don't expect to see 1000+ seconds delay, unsigned is enough */
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| 33 | #define MONOTONIC_US() ((unsigned)monotonic_us())
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| 34 |
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| 35 | enum {
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| 36 | DAD = 1,
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| 37 | UNSOLICITED = 2,
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| 38 | ADVERT = 4,
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| 39 | QUIET = 8,
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| 40 | QUIT_ON_REPLY = 16,
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| 41 | BCAST_ONLY = 32,
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| 42 | UNICASTING = 64
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[821] | 43 | };
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| 44 |
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[2725] | 45 | struct globals {
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| 46 | struct in_addr src;
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| 47 | struct in_addr dst;
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| 48 | struct sockaddr_ll me;
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| 49 | struct sockaddr_ll he;
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| 50 | int sock_fd;
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[821] | 51 |
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[2725] | 52 | int count; // = -1;
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| 53 | unsigned last;
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| 54 | unsigned timeout_us;
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| 55 | unsigned start;
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| 56 |
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| 57 | unsigned sent;
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| 58 | unsigned brd_sent;
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| 59 | unsigned received;
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| 60 | unsigned brd_recv;
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| 61 | unsigned req_recv;
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| 62 | } FIX_ALIASING;
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| 63 | #define G (*(struct globals*)&bb_common_bufsiz1)
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| 64 | #define src (G.src )
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| 65 | #define dst (G.dst )
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| 66 | #define me (G.me )
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| 67 | #define he (G.he )
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| 68 | #define sock_fd (G.sock_fd )
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| 69 | #define count (G.count )
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| 70 | #define last (G.last )
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| 71 | #define timeout_us (G.timeout_us)
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| 72 | #define start (G.start )
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| 73 | #define sent (G.sent )
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| 74 | #define brd_sent (G.brd_sent )
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| 75 | #define received (G.received )
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| 76 | #define brd_recv (G.brd_recv )
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| 77 | #define req_recv (G.req_recv )
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| 78 | #define INIT_G() do { \
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| 79 | count = -1; \
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| 80 | } while (0)
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| 81 |
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| 82 | // If GNUisms are not available...
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| 83 | //static void *mempcpy(void *_dst, const void *_src, int n)
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| 84 | //{
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| 85 | // memcpy(_dst, _src, n);
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| 86 | // return (char*)_dst + n;
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| 87 | //}
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| 88 |
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[1765] | 89 | static int send_pack(struct in_addr *src_addr,
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| 90 | struct in_addr *dst_addr, struct sockaddr_ll *ME,
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| 91 | struct sockaddr_ll *HE)
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[821] | 92 | {
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| 93 | int err;
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[1765] | 94 | unsigned char buf[256];
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[821] | 95 | struct arphdr *ah = (struct arphdr *) buf;
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| 96 | unsigned char *p = (unsigned char *) (ah + 1);
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| 97 |
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| 98 | ah->ar_hrd = htons(ARPHRD_ETHER);
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| 99 | ah->ar_pro = htons(ETH_P_IP);
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| 100 | ah->ar_hln = ME->sll_halen;
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| 101 | ah->ar_pln = 4;
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[1765] | 102 | ah->ar_op = option_mask32 & ADVERT ? htons(ARPOP_REPLY) : htons(ARPOP_REQUEST);
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[821] | 103 |
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[2725] | 104 | p = mempcpy(p, &ME->sll_addr, ah->ar_hln);
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| 105 | p = mempcpy(p, src_addr, 4);
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[821] | 106 |
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[1765] | 107 | if (option_mask32 & ADVERT)
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[2725] | 108 | p = mempcpy(p, &ME->sll_addr, ah->ar_hln);
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[821] | 109 | else
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[2725] | 110 | p = mempcpy(p, &HE->sll_addr, ah->ar_hln);
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[821] | 111 |
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[2725] | 112 | p = mempcpy(p, dst_addr, 4);
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[821] | 113 |
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[2725] | 114 | err = sendto(sock_fd, buf, p - buf, 0, (struct sockaddr *) HE, sizeof(*HE));
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[821] | 115 | if (err == p - buf) {
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[2725] | 116 | last = MONOTONIC_US();
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[821] | 117 | sent++;
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[1765] | 118 | if (!(option_mask32 & UNICASTING))
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[821] | 119 | brd_sent++;
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| 120 | }
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| 121 | return err;
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| 122 | }
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| 123 |
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[2725] | 124 | static void finish(void) NORETURN;
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[821] | 125 | static void finish(void)
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| 126 | {
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[1765] | 127 | if (!(option_mask32 & QUIET)) {
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| 128 | printf("Sent %u probe(s) (%u broadcast(s))\n"
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| 129 | "Received %u repl%s"
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| 130 | " (%u request(s), %u broadcast(s))\n",
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[821] | 131 | sent, brd_sent,
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[1765] | 132 | received, (received == 1) ? "ies" : "y",
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| 133 | req_recv, brd_recv);
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[821] | 134 | }
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[1765] | 135 | if (option_mask32 & DAD)
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[821] | 136 | exit(!!received);
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[1765] | 137 | if (option_mask32 & UNSOLICITED)
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[2725] | 138 | exit(EXIT_SUCCESS);
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[821] | 139 | exit(!received);
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| 140 | }
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| 141 |
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| 142 | static void catcher(void)
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| 143 | {
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[1765] | 144 | unsigned now;
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[821] | 145 |
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[1765] | 146 | now = MONOTONIC_US();
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| 147 | if (start == 0)
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| 148 | start = now;
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[821] | 149 |
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[2725] | 150 | if (count == 0 || (timeout_us && (now - start) > timeout_us))
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[821] | 151 | finish();
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| 152 |
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[2725] | 153 | /* count < 0 means "infinite count" */
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| 154 | if (count > 0)
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| 155 | count--;
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[1765] | 156 |
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| 157 | if (last == 0 || (now - last) > 500000) {
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| 158 | send_pack(&src, &dst, &me, &he);
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| 159 | if (count == 0 && (option_mask32 & UNSOLICITED))
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[821] | 160 | finish();
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| 161 | }
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| 162 | alarm(1);
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| 163 | }
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| 164 |
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[2725] | 165 | static bool recv_pack(unsigned char *buf, int len, struct sockaddr_ll *FROM)
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[821] | 166 | {
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| 167 | struct arphdr *ah = (struct arphdr *) buf;
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| 168 | unsigned char *p = (unsigned char *) (ah + 1);
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| 169 | struct in_addr src_ip, dst_ip;
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[2725] | 170 | /* moves below assume in_addr is 4 bytes big, ensure that */
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| 171 | struct BUG_in_addr_must_be_4 {
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| 172 | char BUG_in_addr_must_be_4[
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| 173 | sizeof(struct in_addr) == 4 ? 1 : -1
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| 174 | ];
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| 175 | char BUG_s_addr_must_be_4[
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| 176 | sizeof(src_ip.s_addr) == 4 ? 1 : -1
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| 177 | ];
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| 178 | };
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[821] | 179 |
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| 180 | /* Filter out wild packets */
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[1765] | 181 | if (FROM->sll_pkttype != PACKET_HOST
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| 182 | && FROM->sll_pkttype != PACKET_BROADCAST
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| 183 | && FROM->sll_pkttype != PACKET_MULTICAST)
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[2725] | 184 | return false;
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[821] | 185 |
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[2725] | 186 | /* Only these types are recognized */
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[821] | 187 | if (ah->ar_op != htons(ARPOP_REQUEST) && ah->ar_op != htons(ARPOP_REPLY))
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[2725] | 188 | return false;
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[821] | 189 |
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| 190 | /* ARPHRD check and this darned FDDI hack here :-( */
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[1765] | 191 | if (ah->ar_hrd != htons(FROM->sll_hatype)
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| 192 | && (FROM->sll_hatype != ARPHRD_FDDI || ah->ar_hrd != htons(ARPHRD_ETHER)))
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[2725] | 193 | return false;
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[821] | 194 |
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| 195 | /* Protocol must be IP. */
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[2725] | 196 | if (ah->ar_pro != htons(ETH_P_IP)
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| 197 | || (ah->ar_pln != 4)
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| 198 | || (ah->ar_hln != me.sll_halen)
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| 199 | || (len < (int)(sizeof(*ah) + 2 * (4 + ah->ar_hln))))
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| 200 | return false;
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| 201 |
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| 202 | move_from_unaligned32(src_ip.s_addr, p + ah->ar_hln);
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| 203 | move_from_unaligned32(dst_ip.s_addr, p + ah->ar_hln + 4 + ah->ar_hln);
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| 204 |
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| 205 | if (dst.s_addr != src_ip.s_addr)
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| 206 | return false;
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[1765] | 207 | if (!(option_mask32 & DAD)) {
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[2725] | 208 | if ((src.s_addr != dst_ip.s_addr)
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| 209 | || (memcmp(p + ah->ar_hln + 4, &me.sll_addr, ah->ar_hln)))
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| 210 | return false;
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[821] | 211 | } else {
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| 212 | /* DAD packet was:
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| 213 | src_ip = 0 (or some src)
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| 214 | src_hw = ME
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| 215 | dst_ip = tested address
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| 216 | dst_hw = <unspec>
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| 217 |
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| 218 | We fail, if receive request/reply with:
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| 219 | src_ip = tested_address
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| 220 | src_hw != ME
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| 221 | if src_ip in request was not zero, check
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| 222 | also that it matches to dst_ip, otherwise
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| 223 | dst_ip/dst_hw do not matter.
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| 224 | */
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[2725] | 225 | if ((memcmp(p, &me.sll_addr, me.sll_halen) == 0)
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| 226 | || (src.s_addr && src.s_addr != dst_ip.s_addr))
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| 227 | return false;
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[821] | 228 | }
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[1765] | 229 | if (!(option_mask32 & QUIET)) {
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[821] | 230 | int s_printed = 0;
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| 231 |
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[1765] | 232 | printf("%scast re%s from %s [%s]",
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| 233 | FROM->sll_pkttype == PACKET_HOST ? "Uni" : "Broad",
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| 234 | ah->ar_op == htons(ARPOP_REPLY) ? "ply" : "quest",
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[821] | 235 | inet_ntoa(src_ip),
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| 236 | ether_ntoa((struct ether_addr *) p));
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| 237 | if (dst_ip.s_addr != src.s_addr) {
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| 238 | printf("for %s ", inet_ntoa(dst_ip));
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| 239 | s_printed = 1;
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| 240 | }
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| 241 | if (memcmp(p + ah->ar_hln + 4, me.sll_addr, ah->ar_hln)) {
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| 242 | if (!s_printed)
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| 243 | printf("for ");
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| 244 | printf("[%s]",
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[1765] | 245 | ether_ntoa((struct ether_addr *) p + ah->ar_hln + 4));
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[821] | 246 | }
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| 247 |
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[1765] | 248 | if (last) {
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[2725] | 249 | unsigned diff = MONOTONIC_US() - last;
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| 250 | printf(" %u.%03ums\n", diff / 1000, diff % 1000);
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[821] | 251 | } else {
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| 252 | printf(" UNSOLICITED?\n");
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| 253 | }
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[2725] | 254 | fflush_all();
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[821] | 255 | }
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| 256 | received++;
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| 257 | if (FROM->sll_pkttype != PACKET_HOST)
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| 258 | brd_recv++;
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| 259 | if (ah->ar_op == htons(ARPOP_REQUEST))
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| 260 | req_recv++;
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[1765] | 261 | if (option_mask32 & QUIT_ON_REPLY)
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[821] | 262 | finish();
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[1765] | 263 | if (!(option_mask32 & BCAST_ONLY)) {
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[821] | 264 | memcpy(he.sll_addr, p, me.sll_halen);
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[1765] | 265 | option_mask32 |= UNICASTING;
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[821] | 266 | }
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[2725] | 267 | return true;
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[821] | 268 | }
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| 269 |
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[2725] | 270 | int arping_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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| 271 | int arping_main(int argc UNUSED_PARAM, char **argv)
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[821] | 272 | {
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[1765] | 273 | const char *device = "eth0";
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[821] | 274 | char *source = NULL;
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| 275 | char *target;
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[1765] | 276 | unsigned char *packet;
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[2725] | 277 | char *err_str;
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[821] | 278 |
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[2725] | 279 | INIT_G();
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[821] | 280 |
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[2725] | 281 | sock_fd = xsocket(AF_PACKET, SOCK_DGRAM, 0);
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| 282 |
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[821] | 283 | // Drop suid root privileges
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[2725] | 284 | // Need to remove SUID_NEVER from applets.h for this to work
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| 285 | //xsetuid(getuid());
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[821] | 286 |
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[2725] | 287 | err_str = xasprintf("interface %s %%s", device);
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[821] | 288 | {
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[1765] | 289 | unsigned opt;
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[2725] | 290 | char *str_timeout;
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[821] | 291 |
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| 292 | /* Dad also sets quit_on_reply.
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| 293 | * Advert also sets unsolicited.
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| 294 | */
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[2725] | 295 | opt_complementary = "=1:Df:AU:c+";
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[1765] | 296 | opt = getopt32(argv, "DUAqfbc:w:I:s:",
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[2725] | 297 | &count, &str_timeout, &device, &source);
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[1765] | 298 | if (opt & 0x80) /* -w: timeout */
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[2725] | 299 | timeout_us = xatou_range(str_timeout, 0, INT_MAX/2000000) * 1000000 + 500000;
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[1765] | 300 | //if (opt & 0x200) /* -s: source */
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| 301 | option_mask32 &= 0x3f; /* set respective flags */
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[821] | 302 | }
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| 303 |
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[1765] | 304 | target = argv[optind];
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[821] | 305 |
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[1765] | 306 | xfunc_error_retval = 2;
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[821] | 307 |
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| 308 | {
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| 309 | struct ifreq ifr;
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| 310 |
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| 311 | memset(&ifr, 0, sizeof(ifr));
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[2725] | 312 | strncpy_IFNAMSIZ(ifr.ifr_name, device);
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| 313 | /* We use ifr.ifr_name in error msg so that problem
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| 314 | * with truncated name will be visible */
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| 315 | ioctl_or_perror_and_die(sock_fd, SIOCGIFINDEX, &ifr, err_str, "not found");
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| 316 | me.sll_ifindex = ifr.ifr_ifindex;
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[821] | 317 |
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[2725] | 318 | xioctl(sock_fd, SIOCGIFFLAGS, (char *) &ifr);
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[1765] | 319 |
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[821] | 320 | if (!(ifr.ifr_flags & IFF_UP)) {
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[2725] | 321 | bb_error_msg_and_die(err_str, "is down");
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[821] | 322 | }
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| 323 | if (ifr.ifr_flags & (IFF_NOARP | IFF_LOOPBACK)) {
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[2725] | 324 | bb_error_msg(err_str, "is not ARPable");
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[1765] | 325 | return (option_mask32 & DAD ? 0 : 2);
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[821] | 326 | }
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| 327 | }
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| 328 |
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[2725] | 329 | /* if (!inet_aton(target, &dst)) - not needed */ {
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[1765] | 330 | len_and_sockaddr *lsa;
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| 331 | lsa = xhost_and_af2sockaddr(target, 0, AF_INET);
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[2725] | 332 | dst = lsa->u.sin.sin_addr;
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[1765] | 333 | if (ENABLE_FEATURE_CLEAN_UP)
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| 334 | free(lsa);
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[821] | 335 | }
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| 336 |
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| 337 | if (source && !inet_aton(source, &src)) {
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| 338 | bb_error_msg_and_die("invalid source address %s", source);
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| 339 | }
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| 340 |
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[2725] | 341 | if ((option_mask32 & (DAD|UNSOLICITED)) == UNSOLICITED && src.s_addr == 0)
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[821] | 342 | src = dst;
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| 343 |
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[1765] | 344 | if (!(option_mask32 & DAD) || src.s_addr) {
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[821] | 345 | struct sockaddr_in saddr;
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[1765] | 346 | int probe_fd = xsocket(AF_INET, SOCK_DGRAM, 0);
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[821] | 347 |
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[2725] | 348 | setsockopt_bindtodevice(probe_fd, device);
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[821] | 349 | memset(&saddr, 0, sizeof(saddr));
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| 350 | saddr.sin_family = AF_INET;
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| 351 | if (src.s_addr) {
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[2725] | 352 | /* Check that this is indeed our IP */
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[821] | 353 | saddr.sin_addr = src;
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[1765] | 354 | xbind(probe_fd, (struct sockaddr *) &saddr, sizeof(saddr));
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[2725] | 355 | } else { /* !(option_mask32 & DAD) case */
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| 356 | /* Find IP address on this iface */
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[821] | 357 | socklen_t alen = sizeof(saddr);
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| 358 |
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| 359 | saddr.sin_port = htons(1025);
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| 360 | saddr.sin_addr = dst;
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| 361 |
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[1765] | 362 | if (setsockopt(probe_fd, SOL_SOCKET, SO_DONTROUTE, &const_int_1, sizeof(const_int_1)) == -1)
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[2725] | 363 | bb_perror_msg("setsockopt(SO_DONTROUTE)");
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[1765] | 364 | xconnect(probe_fd, (struct sockaddr *) &saddr, sizeof(saddr));
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[2725] | 365 | getsockname(probe_fd, (struct sockaddr *) &saddr, &alen);
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| 366 | //never happens:
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| 367 | //if (getsockname(probe_fd, (struct sockaddr *) &saddr, &alen) == -1)
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| 368 | // bb_perror_msg_and_die("getsockname");
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| 369 | if (saddr.sin_family != AF_INET)
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| 370 | bb_error_msg_and_die("no IP address configured");
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[821] | 371 | src = saddr.sin_addr;
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| 372 | }
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| 373 | close(probe_fd);
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[1765] | 374 | }
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[821] | 375 |
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| 376 | me.sll_family = AF_PACKET;
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[2725] | 377 | //me.sll_ifindex = ifindex; - done before
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[821] | 378 | me.sll_protocol = htons(ETH_P_ARP);
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[2725] | 379 | xbind(sock_fd, (struct sockaddr *) &me, sizeof(me));
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[821] | 380 |
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| 381 | {
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| 382 | socklen_t alen = sizeof(me);
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[2725] | 383 | getsockname(sock_fd, (struct sockaddr *) &me, &alen);
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| 384 | //never happens:
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| 385 | //if (getsockname(sock_fd, (struct sockaddr *) &me, &alen) == -1)
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| 386 | // bb_perror_msg_and_die("getsockname");
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[821] | 387 | }
|
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| 388 | if (me.sll_halen == 0) {
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[2725] | 389 | bb_error_msg(err_str, "is not ARPable (no ll address)");
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[1765] | 390 | return (option_mask32 & DAD ? 0 : 2);
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[821] | 391 | }
|
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| 392 | he = me;
|
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| 393 | memset(he.sll_addr, -1, he.sll_halen);
|
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| 394 |
|
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[1765] | 395 | if (!(option_mask32 & QUIET)) {
|
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[2725] | 396 | /* inet_ntoa uses static storage, can't use in same printf */
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| 397 | printf("ARPING to %s", inet_ntoa(dst));
|
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| 398 | printf(" from %s via %s\n", inet_ntoa(src), device);
|
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[821] | 399 | }
|
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| 400 |
|
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[2725] | 401 | signal_SA_RESTART_empty_mask(SIGINT, (void (*)(int))finish);
|
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| 402 | signal_SA_RESTART_empty_mask(SIGALRM, (void (*)(int))catcher);
|
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[821] | 403 |
|
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| 404 | catcher();
|
---|
| 405 |
|
---|
[1765] | 406 | packet = xmalloc(4096);
|
---|
[821] | 407 | while (1) {
|
---|
| 408 | sigset_t sset, osset;
|
---|
| 409 | struct sockaddr_ll from;
|
---|
| 410 | socklen_t alen = sizeof(from);
|
---|
| 411 | int cc;
|
---|
| 412 |
|
---|
[2725] | 413 | cc = recvfrom(sock_fd, packet, 4096, 0, (struct sockaddr *) &from, &alen);
|
---|
[1765] | 414 | if (cc < 0) {
|
---|
| 415 | bb_perror_msg("recvfrom");
|
---|
[821] | 416 | continue;
|
---|
| 417 | }
|
---|
| 418 | sigemptyset(&sset);
|
---|
| 419 | sigaddset(&sset, SIGALRM);
|
---|
| 420 | sigaddset(&sset, SIGINT);
|
---|
| 421 | sigprocmask(SIG_BLOCK, &sset, &osset);
|
---|
| 422 | recv_pack(packet, cc, &from);
|
---|
| 423 | sigprocmask(SIG_SETMASK, &osset, NULL);
|
---|
| 424 | }
|
---|
| 425 | }
|
---|