[1765] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * arp.c - Manipulate the system ARP cache
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| 4 | *
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| 5 | * This program is free software; you can redistribute it and/or
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| 6 | * modify it under the terms of the GNU General Public License
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| 7 | * as published by the Free Software Foundation; either version
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| 8 | * 2 of the License, or (at your option) any later version.
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| 9 | *
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| 10 | * Author: Fred N. van Kempen, <waltje at uwalt.nl.mugnet.org>
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| 11 | * Busybox port: Paul van Gool <pvangool at mimotech.com>
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| 12 | *
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| 13 | * modified for getopt32 by Arne Bernin <arne [at] alamut.de>
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| 14 | */
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| 15 |
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[3232] | 16 | //usage:#define arp_trivial_usage
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| 17 | //usage: "\n[-vn] [-H HWTYPE] [-i IF] -a [HOSTNAME]"
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| 18 | //usage: "\n[-v] [-i IF] -d HOSTNAME [pub]"
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| 19 | //usage: "\n[-v] [-H HWTYPE] [-i IF] -s HOSTNAME HWADDR [temp]"
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| 20 | //usage: "\n[-v] [-H HWTYPE] [-i IF] -s HOSTNAME HWADDR [netmask MASK] pub"
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| 21 | //usage: "\n[-v] [-H HWTYPE] [-i IF] -Ds HOSTNAME IFACE [netmask MASK] pub"
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| 22 | //usage:#define arp_full_usage "\n\n"
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| 23 | //usage: "Manipulate ARP cache\n"
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| 24 | //usage: "\n -a Display (all) hosts"
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| 25 | //usage: "\n -s Set new ARP entry"
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| 26 | //usage: "\n -d Delete a specified entry"
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| 27 | //usage: "\n -v Verbose"
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| 28 | //usage: "\n -n Don't resolve names"
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| 29 | //usage: "\n -i IF Network interface"
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| 30 | //usage: "\n -D Read <hwaddr> from given device"
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| 31 | //usage: "\n -A,-p AF Protocol family"
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| 32 | //usage: "\n -H HWTYPE Hardware address type"
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| 33 |
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[1765] | 34 | #include "libbb.h"
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| 35 | #include "inet_common.h"
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| 36 |
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| 37 | #include <arpa/inet.h>
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| 38 | #include <net/if.h>
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| 39 | #include <net/if_arp.h>
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| 40 | #include <netinet/ether.h>
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| 41 | #include <netpacket/packet.h>
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| 42 |
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| 43 | #define DEBUG 0
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| 44 |
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| 45 | #define DFLT_AF "inet"
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| 46 | #define DFLT_HW "ether"
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| 47 |
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[2725] | 48 | enum {
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| 49 | ARP_OPT_A = (1 << 0),
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| 50 | ARP_OPT_p = (1 << 1),
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| 51 | ARP_OPT_H = (1 << 2),
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| 52 | ARP_OPT_t = (1 << 3),
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| 53 | ARP_OPT_i = (1 << 4),
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| 54 | ARP_OPT_a = (1 << 5),
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| 55 | ARP_OPT_d = (1 << 6),
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| 56 | ARP_OPT_n = (1 << 7), /* do not resolve addresses */
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| 57 | ARP_OPT_D = (1 << 8), /* HW-address is devicename */
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| 58 | ARP_OPT_s = (1 << 9),
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| 59 | ARP_OPT_v = (1 << 10) * DEBUG, /* debugging output flag */
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| 60 | };
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[1765] | 61 |
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[2725] | 62 | enum {
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| 63 | sockfd = 3, /* active socket descriptor */
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| 64 | };
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[1765] | 65 |
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[2725] | 66 | struct globals {
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| 67 | const struct aftype *ap; /* current address family */
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| 68 | const struct hwtype *hw; /* current hardware type */
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| 69 | const char *device; /* current device */
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| 70 | smallint hw_set; /* flag if hw-type was set (-H) */
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[1765] | 71 |
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[2725] | 72 | } FIX_ALIASING;
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| 73 | #define G (*(struct globals*)&bb_common_bufsiz1)
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| 74 | #define ap (G.ap )
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| 75 | #define hw (G.hw )
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| 76 | #define device (G.device )
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| 77 | #define hw_set (G.hw_set )
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| 78 | #define INIT_G() do { \
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| 79 | device = ""; \
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| 80 | } while (0)
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| 81 |
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| 82 |
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[1765] | 83 | static const char options[] ALIGN1 =
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| 84 | "pub\0"
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| 85 | "priv\0"
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| 86 | "temp\0"
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| 87 | "trail\0"
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| 88 | "dontpub\0"
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| 89 | "auto\0"
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| 90 | "dev\0"
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| 91 | "netmask\0";
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| 92 |
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| 93 | /* Delete an entry from the ARP cache. */
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| 94 | /* Called only from main, once */
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| 95 | static int arp_del(char **args)
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| 96 | {
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| 97 | char *host;
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| 98 | struct arpreq req;
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| 99 | struct sockaddr sa;
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| 100 | int flags = 0;
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| 101 | int err;
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| 102 |
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| 103 | memset(&req, 0, sizeof(req));
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| 104 |
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| 105 | /* Resolve the host name. */
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| 106 | host = *args;
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| 107 | if (ap->input(host, &sa) < 0) {
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| 108 | bb_herror_msg_and_die("%s", host);
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| 109 | }
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| 110 |
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| 111 | /* If a host has more than one address, use the correct one! */
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| 112 | memcpy(&req.arp_pa, &sa, sizeof(struct sockaddr));
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| 113 |
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| 114 | if (hw_set)
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| 115 | req.arp_ha.sa_family = hw->type;
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| 116 |
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| 117 | req.arp_flags = ATF_PERM;
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| 118 | args++;
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| 119 | while (*args != NULL) {
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| 120 | switch (index_in_strings(options, *args)) {
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| 121 | case 0: /* "pub" */
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| 122 | flags |= 1;
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| 123 | args++;
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| 124 | break;
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| 125 | case 1: /* "priv" */
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| 126 | flags |= 2;
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| 127 | args++;
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| 128 | break;
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| 129 | case 2: /* "temp" */
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| 130 | req.arp_flags &= ~ATF_PERM;
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| 131 | args++;
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| 132 | break;
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| 133 | case 3: /* "trail" */
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| 134 | req.arp_flags |= ATF_USETRAILERS;
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| 135 | args++;
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| 136 | break;
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| 137 | case 4: /* "dontpub" */
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| 138 | #ifdef HAVE_ATF_DONTPUB
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| 139 | req.arp_flags |= ATF_DONTPUB;
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| 140 | #else
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| 141 | bb_error_msg("feature ATF_DONTPUB is not supported");
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| 142 | #endif
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| 143 | args++;
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| 144 | break;
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| 145 | case 5: /* "auto" */
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| 146 | #ifdef HAVE_ATF_MAGIC
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| 147 | req.arp_flags |= ATF_MAGIC;
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| 148 | #else
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| 149 | bb_error_msg("feature ATF_MAGIC is not supported");
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| 150 | #endif
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| 151 | args++;
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| 152 | break;
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| 153 | case 6: /* "dev" */
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| 154 | if (*++args == NULL)
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| 155 | bb_show_usage();
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| 156 | device = *args;
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| 157 | args++;
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| 158 | break;
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| 159 | case 7: /* "netmask" */
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| 160 | if (*++args == NULL)
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| 161 | bb_show_usage();
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| 162 | if (strcmp(*args, "255.255.255.255") != 0) {
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| 163 | host = *args;
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| 164 | if (ap->input(host, &sa) < 0) {
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| 165 | bb_herror_msg_and_die("%s", host);
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| 166 | }
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| 167 | memcpy(&req.arp_netmask, &sa, sizeof(struct sockaddr));
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| 168 | req.arp_flags |= ATF_NETMASK;
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| 169 | }
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| 170 | args++;
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| 171 | break;
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| 172 | default:
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| 173 | bb_show_usage();
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| 174 | break;
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| 175 | }
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| 176 | }
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| 177 | if (flags == 0)
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| 178 | flags = 3;
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| 179 |
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| 180 | strncpy(req.arp_dev, device, sizeof(req.arp_dev));
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| 181 |
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| 182 | err = -1;
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| 183 |
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| 184 | /* Call the kernel. */
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| 185 | if (flags & 2) {
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| 186 | if (option_mask32 & ARP_OPT_v)
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| 187 | bb_error_msg("SIOCDARP(nopub)");
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| 188 | err = ioctl(sockfd, SIOCDARP, &req);
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| 189 | if (err < 0) {
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| 190 | if (errno == ENXIO) {
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| 191 | if (flags & 1)
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| 192 | goto nopub;
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| 193 | printf("No ARP entry for %s\n", host);
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| 194 | return -1;
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| 195 | }
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| 196 | bb_perror_msg_and_die("SIOCDARP(priv)");
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| 197 | }
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| 198 | }
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| 199 | if ((flags & 1) && err) {
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| 200 | nopub:
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| 201 | req.arp_flags |= ATF_PUBL;
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| 202 | if (option_mask32 & ARP_OPT_v)
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| 203 | bb_error_msg("SIOCDARP(pub)");
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| 204 | if (ioctl(sockfd, SIOCDARP, &req) < 0) {
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| 205 | if (errno == ENXIO) {
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| 206 | printf("No ARP entry for %s\n", host);
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| 207 | return -1;
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| 208 | }
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| 209 | bb_perror_msg_and_die("SIOCDARP(pub)");
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| 210 | }
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| 211 | }
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| 212 | return 0;
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| 213 | }
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| 214 |
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| 215 | /* Get the hardware address to a specified interface name */
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| 216 | static void arp_getdevhw(char *ifname, struct sockaddr *sa,
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[3232] | 217 | const struct hwtype *hwt)
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[1765] | 218 | {
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| 219 | struct ifreq ifr;
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| 220 | const struct hwtype *xhw;
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| 221 |
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| 222 | strcpy(ifr.ifr_name, ifname);
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| 223 | ioctl_or_perror_and_die(sockfd, SIOCGIFHWADDR, &ifr,
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| 224 | "cant get HW-Address for '%s'", ifname);
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| 225 | if (hwt && (ifr.ifr_hwaddr.sa_family != hw->type)) {
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| 226 | bb_error_msg_and_die("protocol type mismatch");
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| 227 | }
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| 228 | memcpy(sa, &(ifr.ifr_hwaddr), sizeof(struct sockaddr));
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| 229 |
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| 230 | if (option_mask32 & ARP_OPT_v) {
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| 231 | xhw = get_hwntype(ifr.ifr_hwaddr.sa_family);
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| 232 | if (!xhw || !xhw->print) {
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| 233 | xhw = get_hwntype(-1);
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| 234 | }
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| 235 | bb_error_msg("device '%s' has HW address %s '%s'",
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[3232] | 236 | ifname, xhw->name,
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| 237 | xhw->print((unsigned char *) &ifr.ifr_hwaddr.sa_data));
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[1765] | 238 | }
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| 239 | }
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| 240 |
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| 241 | /* Set an entry in the ARP cache. */
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| 242 | /* Called only from main, once */
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| 243 | static int arp_set(char **args)
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| 244 | {
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| 245 | char *host;
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| 246 | struct arpreq req;
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| 247 | struct sockaddr sa;
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| 248 | int flags;
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| 249 |
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| 250 | memset(&req, 0, sizeof(req));
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| 251 |
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| 252 | host = *args++;
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| 253 | if (ap->input(host, &sa) < 0) {
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| 254 | bb_herror_msg_and_die("%s", host);
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| 255 | }
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| 256 | /* If a host has more than one address, use the correct one! */
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| 257 | memcpy(&req.arp_pa, &sa, sizeof(struct sockaddr));
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| 258 |
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| 259 | /* Fetch the hardware address. */
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| 260 | if (*args == NULL) {
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| 261 | bb_error_msg_and_die("need hardware address");
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| 262 | }
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| 263 | if (option_mask32 & ARP_OPT_D) {
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| 264 | arp_getdevhw(*args++, &req.arp_ha, hw_set ? hw : NULL);
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| 265 | } else {
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| 266 | if (hw->input(*args++, &req.arp_ha) < 0) {
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| 267 | bb_error_msg_and_die("invalid hardware address");
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| 268 | }
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| 269 | }
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| 270 |
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| 271 | /* Check out any modifiers. */
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| 272 | flags = ATF_PERM | ATF_COM;
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| 273 | while (*args != NULL) {
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| 274 | switch (index_in_strings(options, *args)) {
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| 275 | case 0: /* "pub" */
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| 276 | flags |= ATF_PUBL;
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| 277 | args++;
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| 278 | break;
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| 279 | case 1: /* "priv" */
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| 280 | flags &= ~ATF_PUBL;
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| 281 | args++;
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| 282 | break;
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| 283 | case 2: /* "temp" */
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| 284 | flags &= ~ATF_PERM;
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| 285 | args++;
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| 286 | break;
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| 287 | case 3: /* "trail" */
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| 288 | flags |= ATF_USETRAILERS;
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| 289 | args++;
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| 290 | break;
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| 291 | case 4: /* "dontpub" */
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| 292 | #ifdef HAVE_ATF_DONTPUB
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| 293 | flags |= ATF_DONTPUB;
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| 294 | #else
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| 295 | bb_error_msg("feature ATF_DONTPUB is not supported");
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| 296 | #endif
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| 297 | args++;
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| 298 | break;
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| 299 | case 5: /* "auto" */
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| 300 | #ifdef HAVE_ATF_MAGIC
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| 301 | flags |= ATF_MAGIC;
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| 302 | #else
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| 303 | bb_error_msg("feature ATF_MAGIC is not supported");
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| 304 | #endif
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| 305 | args++;
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| 306 | break;
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| 307 | case 6: /* "dev" */
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| 308 | if (*++args == NULL)
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| 309 | bb_show_usage();
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| 310 | device = *args;
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| 311 | args++;
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| 312 | break;
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| 313 | case 7: /* "netmask" */
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| 314 | if (*++args == NULL)
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| 315 | bb_show_usage();
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| 316 | if (strcmp(*args, "255.255.255.255") != 0) {
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| 317 | host = *args;
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| 318 | if (ap->input(host, &sa) < 0) {
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| 319 | bb_herror_msg_and_die("%s", host);
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| 320 | }
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| 321 | memcpy(&req.arp_netmask, &sa, sizeof(struct sockaddr));
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| 322 | flags |= ATF_NETMASK;
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| 323 | }
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| 324 | args++;
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| 325 | break;
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| 326 | default:
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| 327 | bb_show_usage();
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| 328 | break;
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| 329 | }
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| 330 | }
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| 331 |
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| 332 | /* Fill in the remainder of the request. */
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| 333 | req.arp_flags = flags;
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| 334 |
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| 335 | strncpy(req.arp_dev, device, sizeof(req.arp_dev));
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| 336 |
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| 337 | /* Call the kernel. */
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| 338 | if (option_mask32 & ARP_OPT_v)
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| 339 | bb_error_msg("SIOCSARP()");
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| 340 | xioctl(sockfd, SIOCSARP, &req);
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| 341 | return 0;
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| 342 | }
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| 343 |
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| 344 |
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| 345 | /* Print the contents of an ARP request block. */
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| 346 | static void
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| 347 | arp_disp(const char *name, char *ip, int type, int arp_flags,
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[3232] | 348 | char *hwa, char *mask, char *dev)
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[1765] | 349 | {
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[2725] | 350 | static const int arp_masks[] = {
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| 351 | ATF_PERM, ATF_PUBL,
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| 352 | #ifdef HAVE_ATF_MAGIC
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| 353 | ATF_MAGIC,
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| 354 | #endif
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| 355 | #ifdef HAVE_ATF_DONTPUB
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| 356 | ATF_DONTPUB,
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| 357 | #endif
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| 358 | ATF_USETRAILERS,
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| 359 | };
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| 360 | static const char arp_labels[] ALIGN1 = "PERM\0""PUP\0"
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| 361 | #ifdef HAVE_ATF_MAGIC
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| 362 | "AUTO\0"
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| 363 | #endif
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| 364 | #ifdef HAVE_ATF_DONTPUB
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| 365 | "DONTPUB\0"
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| 366 | #endif
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| 367 | "TRAIL\0"
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| 368 | ;
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| 369 |
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[1765] | 370 | const struct hwtype *xhw;
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| 371 |
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| 372 | xhw = get_hwntype(type);
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| 373 | if (xhw == NULL)
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| 374 | xhw = get_hwtype(DFLT_HW);
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| 375 |
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| 376 | printf("%s (%s) at ", name, ip);
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| 377 |
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| 378 | if (!(arp_flags & ATF_COM)) {
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| 379 | if (arp_flags & ATF_PUBL)
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| 380 | printf("* ");
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| 381 | else
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| 382 | printf("<incomplete> ");
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| 383 | } else {
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| 384 | printf("%s [%s] ", hwa, xhw->name);
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| 385 | }
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| 386 |
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| 387 | if (arp_flags & ATF_NETMASK)
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| 388 | printf("netmask %s ", mask);
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| 389 |
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[2725] | 390 | print_flags_separated(arp_masks, arp_labels, arp_flags, " ");
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| 391 | printf(" on %s\n", dev);
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[1765] | 392 | }
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| 393 |
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| 394 | /* Display the contents of the ARP cache in the kernel. */
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| 395 | /* Called only from main, once */
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| 396 | static int arp_show(char *name)
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| 397 | {
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| 398 | const char *host;
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| 399 | const char *hostname;
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| 400 | FILE *fp;
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| 401 | struct sockaddr sa;
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| 402 | int type, flags;
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| 403 | int num;
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| 404 | unsigned entries = 0, shown = 0;
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| 405 | char ip[128];
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| 406 | char hwa[128];
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| 407 | char mask[128];
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| 408 | char line[128];
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| 409 | char dev[128];
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| 410 |
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| 411 | host = NULL;
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| 412 | if (name != NULL) {
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| 413 | /* Resolve the host name. */
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| 414 | if (ap->input(name, &sa) < 0) {
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| 415 | bb_herror_msg_and_die("%s", name);
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| 416 | }
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| 417 | host = xstrdup(ap->sprint(&sa, 1));
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| 418 | }
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[2725] | 419 | fp = xfopen_for_read("/proc/net/arp");
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[1765] | 420 | /* Bypass header -- read one line */
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| 421 | fgets(line, sizeof(line), fp);
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| 422 |
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| 423 | /* Read the ARP cache entries. */
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| 424 | while (fgets(line, sizeof(line), fp)) {
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| 425 |
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| 426 | mask[0] = '-'; mask[1] = '\0';
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| 427 | dev[0] = '-'; dev[1] = '\0';
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| 428 | /* All these strings can't overflow
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| 429 | * because fgets above reads limited amount of data */
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| 430 | num = sscanf(line, "%s 0x%x 0x%x %s %s %s\n",
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[3232] | 431 | ip, &type, &flags, hwa, mask, dev);
|
---|
[1765] | 432 | if (num < 4)
|
---|
| 433 | break;
|
---|
| 434 |
|
---|
| 435 | entries++;
|
---|
| 436 | /* if the user specified hw-type differs, skip it */
|
---|
| 437 | if (hw_set && (type != hw->type))
|
---|
| 438 | continue;
|
---|
| 439 |
|
---|
| 440 | /* if the user specified address differs, skip it */
|
---|
| 441 | if (host && strcmp(ip, host) != 0)
|
---|
| 442 | continue;
|
---|
| 443 |
|
---|
| 444 | /* if the user specified device differs, skip it */
|
---|
| 445 | if (device[0] && strcmp(dev, device) != 0)
|
---|
| 446 | continue;
|
---|
| 447 |
|
---|
| 448 | shown++;
|
---|
| 449 | /* This IS ugly but it works -be */
|
---|
| 450 | hostname = "?";
|
---|
| 451 | if (!(option_mask32 & ARP_OPT_n)) {
|
---|
| 452 | if (ap->input(ip, &sa) < 0)
|
---|
| 453 | hostname = ip;
|
---|
| 454 | else
|
---|
| 455 | hostname = ap->sprint(&sa, (option_mask32 & ARP_OPT_n) | 0x8000);
|
---|
| 456 | if (strcmp(hostname, ip) == 0)
|
---|
| 457 | hostname = "?";
|
---|
| 458 | }
|
---|
| 459 |
|
---|
| 460 | arp_disp(hostname, ip, type, flags, hwa, mask, dev);
|
---|
| 461 | }
|
---|
| 462 | if (option_mask32 & ARP_OPT_v)
|
---|
| 463 | printf("Entries: %d\tSkipped: %d\tFound: %d\n",
|
---|
[3232] | 464 | entries, entries - shown, shown);
|
---|
[1765] | 465 |
|
---|
| 466 | if (!shown) {
|
---|
| 467 | if (hw_set || host || device[0])
|
---|
| 468 | printf("No match found in %d entries\n", entries);
|
---|
| 469 | }
|
---|
| 470 | if (ENABLE_FEATURE_CLEAN_UP) {
|
---|
| 471 | free((char*)host);
|
---|
| 472 | fclose(fp);
|
---|
| 473 | }
|
---|
| 474 | return 0;
|
---|
| 475 | }
|
---|
| 476 |
|
---|
[2725] | 477 | int arp_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
---|
| 478 | int arp_main(int argc UNUSED_PARAM, char **argv)
|
---|
[1765] | 479 | {
|
---|
[2725] | 480 | const char *hw_type = "ether";
|
---|
| 481 | const char *protocol;
|
---|
| 482 | unsigned opts;
|
---|
[1765] | 483 |
|
---|
[2725] | 484 | INIT_G();
|
---|
| 485 |
|
---|
| 486 | xmove_fd(xsocket(AF_INET, SOCK_DGRAM, 0), sockfd);
|
---|
[1765] | 487 | ap = get_aftype(DFLT_AF);
|
---|
| 488 | if (!ap)
|
---|
| 489 | bb_error_msg_and_die("%s: %s not supported", DFLT_AF, "address family");
|
---|
| 490 |
|
---|
[2725] | 491 | opts = getopt32(argv, "A:p:H:t:i:adnDsv", &protocol, &protocol,
|
---|
[1765] | 492 | &hw_type, &hw_type, &device);
|
---|
| 493 | argv += optind;
|
---|
[2725] | 494 | if (opts & (ARP_OPT_A | ARP_OPT_p)) {
|
---|
[1765] | 495 | ap = get_aftype(protocol);
|
---|
| 496 | if (ap == NULL)
|
---|
| 497 | bb_error_msg_and_die("%s: unknown %s", protocol, "address family");
|
---|
| 498 | }
|
---|
[2725] | 499 | if (opts & (ARP_OPT_A | ARP_OPT_p)) {
|
---|
[1765] | 500 | hw = get_hwtype(hw_type);
|
---|
| 501 | if (hw == NULL)
|
---|
| 502 | bb_error_msg_and_die("%s: unknown %s", hw_type, "hardware type");
|
---|
| 503 | hw_set = 1;
|
---|
| 504 | }
|
---|
[2725] | 505 | //if (opts & ARP_OPT_i)... -i
|
---|
[1765] | 506 |
|
---|
| 507 | if (ap->af != AF_INET) {
|
---|
| 508 | bb_error_msg_and_die("%s: kernel only supports 'inet'", ap->name);
|
---|
| 509 | }
|
---|
| 510 |
|
---|
| 511 | /* If no hw type specified get default */
|
---|
| 512 | if (!hw) {
|
---|
| 513 | hw = get_hwtype(DFLT_HW);
|
---|
| 514 | if (!hw)
|
---|
| 515 | bb_error_msg_and_die("%s: %s not supported", DFLT_HW, "hardware type");
|
---|
| 516 | }
|
---|
| 517 |
|
---|
| 518 | if (hw->alen <= 0) {
|
---|
| 519 | bb_error_msg_and_die("%s: %s without ARP support",
|
---|
[3232] | 520 | hw->name, "hardware type");
|
---|
[1765] | 521 | }
|
---|
| 522 |
|
---|
| 523 | /* Now see what we have to do here... */
|
---|
[2725] | 524 | if (opts & (ARP_OPT_d | ARP_OPT_s)) {
|
---|
[1765] | 525 | if (argv[0] == NULL)
|
---|
| 526 | bb_error_msg_and_die("need host name");
|
---|
[2725] | 527 | if (opts & ARP_OPT_s)
|
---|
[1765] | 528 | return arp_set(argv);
|
---|
| 529 | return arp_del(argv);
|
---|
| 530 | }
|
---|
[2725] | 531 | //if (opts & ARP_OPT_a) - default
|
---|
[1765] | 532 | return arp_show(argv[0]);
|
---|
| 533 | }
|
---|