[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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| 16 | #include "libbb.h"
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| 17 | #include "inet_common.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 <net/if_arp.h>
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| 22 | #include <netinet/ether.h>
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| 23 | #include <netpacket/packet.h>
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| 24 |
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| 25 | #define DEBUG 0
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| 26 |
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| 27 | #define DFLT_AF "inet"
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| 28 | #define DFLT_HW "ether"
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| 29 |
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| 30 | #define ARP_OPT_A (0x1)
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| 31 | #define ARP_OPT_p (0x2)
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| 32 | #define ARP_OPT_H (0x4)
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| 33 | #define ARP_OPT_t (0x8)
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| 34 | #define ARP_OPT_i (0x10)
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| 35 | #define ARP_OPT_a (0x20)
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| 36 | #define ARP_OPT_d (0x40)
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| 37 | #define ARP_OPT_n (0x80) /* do not resolve addresses */
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| 38 | #define ARP_OPT_D (0x100) /* HW-address is devicename */
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| 39 | #define ARP_OPT_s (0x200)
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| 40 | #define ARP_OPT_v (0x400 * DEBUG) /* debugging output flag */
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| 41 |
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| 42 |
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| 43 | static const struct aftype *ap; /* current address family */
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| 44 | static const struct hwtype *hw; /* current hardware type */
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| 45 | static int sockfd; /* active socket descriptor */
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| 46 | static smallint hw_set; /* flag if hw-type was set (-H) */
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| 47 | static const char *device = ""; /* current device */
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| 48 |
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| 49 | static const char options[] ALIGN1 =
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| 50 | "pub\0"
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| 51 | "priv\0"
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| 52 | "temp\0"
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| 53 | "trail\0"
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| 54 | "dontpub\0"
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| 55 | "auto\0"
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| 56 | "dev\0"
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| 57 | "netmask\0";
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| 58 |
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| 59 | /* Delete an entry from the ARP cache. */
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| 60 | /* Called only from main, once */
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| 61 | static int arp_del(char **args)
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| 62 | {
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| 63 | char *host;
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| 64 | struct arpreq req;
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| 65 | struct sockaddr sa;
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| 66 | int flags = 0;
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| 67 | int err;
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| 68 |
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| 69 | memset(&req, 0, sizeof(req));
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| 70 |
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| 71 | /* Resolve the host name. */
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| 72 | host = *args;
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| 73 | if (ap->input(host, &sa) < 0) {
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| 74 | bb_herror_msg_and_die("%s", host);
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| 75 | }
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| 76 |
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| 77 | /* If a host has more than one address, use the correct one! */
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| 78 | memcpy(&req.arp_pa, &sa, sizeof(struct sockaddr));
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| 79 |
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| 80 | if (hw_set)
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| 81 | req.arp_ha.sa_family = hw->type;
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| 82 |
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| 83 | req.arp_flags = ATF_PERM;
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| 84 | args++;
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| 85 | while (*args != NULL) {
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| 86 | switch (index_in_strings(options, *args)) {
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| 87 | case 0: /* "pub" */
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| 88 | flags |= 1;
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| 89 | args++;
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| 90 | break;
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| 91 | case 1: /* "priv" */
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| 92 | flags |= 2;
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| 93 | args++;
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| 94 | break;
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| 95 | case 2: /* "temp" */
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| 96 | req.arp_flags &= ~ATF_PERM;
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| 97 | args++;
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| 98 | break;
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| 99 | case 3: /* "trail" */
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| 100 | req.arp_flags |= ATF_USETRAILERS;
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| 101 | args++;
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| 102 | break;
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| 103 | case 4: /* "dontpub" */
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| 104 | #ifdef HAVE_ATF_DONTPUB
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| 105 | req.arp_flags |= ATF_DONTPUB;
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| 106 | #else
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| 107 | bb_error_msg("feature ATF_DONTPUB is not supported");
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| 108 | #endif
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| 109 | args++;
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| 110 | break;
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| 111 | case 5: /* "auto" */
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| 112 | #ifdef HAVE_ATF_MAGIC
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| 113 | req.arp_flags |= ATF_MAGIC;
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| 114 | #else
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| 115 | bb_error_msg("feature ATF_MAGIC is not supported");
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| 116 | #endif
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| 117 | args++;
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| 118 | break;
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| 119 | case 6: /* "dev" */
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| 120 | if (*++args == NULL)
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| 121 | bb_show_usage();
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| 122 | device = *args;
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| 123 | args++;
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| 124 | break;
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| 125 | case 7: /* "netmask" */
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| 126 | if (*++args == NULL)
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| 127 | bb_show_usage();
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| 128 | if (strcmp(*args, "255.255.255.255") != 0) {
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| 129 | host = *args;
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| 130 | if (ap->input(host, &sa) < 0) {
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| 131 | bb_herror_msg_and_die("%s", host);
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| 132 | }
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| 133 | memcpy(&req.arp_netmask, &sa, sizeof(struct sockaddr));
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| 134 | req.arp_flags |= ATF_NETMASK;
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| 135 | }
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| 136 | args++;
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| 137 | break;
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| 138 | default:
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| 139 | bb_show_usage();
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| 140 | break;
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| 141 | }
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| 142 | }
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| 143 | if (flags == 0)
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| 144 | flags = 3;
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| 145 |
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| 146 | strncpy(req.arp_dev, device, sizeof(req.arp_dev));
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| 147 |
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| 148 | err = -1;
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| 149 |
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| 150 | /* Call the kernel. */
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| 151 | if (flags & 2) {
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| 152 | if (option_mask32 & ARP_OPT_v)
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| 153 | bb_error_msg("SIOCDARP(nopub)");
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| 154 | err = ioctl(sockfd, SIOCDARP, &req);
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| 155 | if (err < 0) {
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| 156 | if (errno == ENXIO) {
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| 157 | if (flags & 1)
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| 158 | goto nopub;
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| 159 | printf("No ARP entry for %s\n", host);
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| 160 | return -1;
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| 161 | }
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| 162 | bb_perror_msg_and_die("SIOCDARP(priv)");
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| 163 | }
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| 164 | }
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| 165 | if ((flags & 1) && err) {
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| 166 | nopub:
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| 167 | req.arp_flags |= ATF_PUBL;
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| 168 | if (option_mask32 & ARP_OPT_v)
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| 169 | bb_error_msg("SIOCDARP(pub)");
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| 170 | if (ioctl(sockfd, SIOCDARP, &req) < 0) {
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| 171 | if (errno == ENXIO) {
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| 172 | printf("No ARP entry for %s\n", host);
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| 173 | return -1;
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| 174 | }
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| 175 | bb_perror_msg_and_die("SIOCDARP(pub)");
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| 176 | }
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| 177 | }
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| 178 | return 0;
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| 179 | }
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| 180 |
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| 181 | /* Get the hardware address to a specified interface name */
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| 182 | static void arp_getdevhw(char *ifname, struct sockaddr *sa,
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| 183 | const struct hwtype *hwt)
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| 184 | {
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| 185 | struct ifreq ifr;
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| 186 | const struct hwtype *xhw;
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| 187 |
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| 188 | strcpy(ifr.ifr_name, ifname);
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| 189 | ioctl_or_perror_and_die(sockfd, SIOCGIFHWADDR, &ifr,
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| 190 | "cant get HW-Address for '%s'", ifname);
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| 191 | if (hwt && (ifr.ifr_hwaddr.sa_family != hw->type)) {
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| 192 | bb_error_msg_and_die("protocol type mismatch");
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| 193 | }
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| 194 | memcpy(sa, &(ifr.ifr_hwaddr), sizeof(struct sockaddr));
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| 195 |
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| 196 | if (option_mask32 & ARP_OPT_v) {
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| 197 | xhw = get_hwntype(ifr.ifr_hwaddr.sa_family);
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| 198 | if (!xhw || !xhw->print) {
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| 199 | xhw = get_hwntype(-1);
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| 200 | }
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| 201 | bb_error_msg("device '%s' has HW address %s '%s'",
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| 202 | ifname, xhw->name,
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| 203 | xhw->print((char *) &ifr.ifr_hwaddr.sa_data));
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| 204 | }
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| 205 | }
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| 206 |
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| 207 | /* Set an entry in the ARP cache. */
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| 208 | /* Called only from main, once */
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| 209 | static int arp_set(char **args)
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| 210 | {
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| 211 | char *host;
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| 212 | struct arpreq req;
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| 213 | struct sockaddr sa;
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| 214 | int flags;
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| 215 |
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| 216 | memset(&req, 0, sizeof(req));
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| 217 |
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| 218 | host = *args++;
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| 219 | if (ap->input(host, &sa) < 0) {
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| 220 | bb_herror_msg_and_die("%s", host);
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| 221 | }
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| 222 | /* If a host has more than one address, use the correct one! */
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| 223 | memcpy(&req.arp_pa, &sa, sizeof(struct sockaddr));
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| 224 |
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| 225 | /* Fetch the hardware address. */
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| 226 | if (*args == NULL) {
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| 227 | bb_error_msg_and_die("need hardware address");
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| 228 | }
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| 229 | if (option_mask32 & ARP_OPT_D) {
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| 230 | arp_getdevhw(*args++, &req.arp_ha, hw_set ? hw : NULL);
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| 231 | } else {
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| 232 | if (hw->input(*args++, &req.arp_ha) < 0) {
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| 233 | bb_error_msg_and_die("invalid hardware address");
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| 234 | }
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| 235 | }
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| 236 |
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| 237 | /* Check out any modifiers. */
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| 238 | flags = ATF_PERM | ATF_COM;
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| 239 | while (*args != NULL) {
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| 240 | switch (index_in_strings(options, *args)) {
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| 241 | case 0: /* "pub" */
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| 242 | flags |= ATF_PUBL;
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| 243 | args++;
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| 244 | break;
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| 245 | case 1: /* "priv" */
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| 246 | flags &= ~ATF_PUBL;
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| 247 | args++;
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| 248 | break;
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| 249 | case 2: /* "temp" */
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| 250 | flags &= ~ATF_PERM;
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| 251 | args++;
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| 252 | break;
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| 253 | case 3: /* "trail" */
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| 254 | flags |= ATF_USETRAILERS;
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| 255 | args++;
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| 256 | break;
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| 257 | case 4: /* "dontpub" */
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| 258 | #ifdef HAVE_ATF_DONTPUB
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| 259 | flags |= ATF_DONTPUB;
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| 260 | #else
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| 261 | bb_error_msg("feature ATF_DONTPUB is not supported");
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| 262 | #endif
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| 263 | args++;
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| 264 | break;
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| 265 | case 5: /* "auto" */
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| 266 | #ifdef HAVE_ATF_MAGIC
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| 267 | flags |= ATF_MAGIC;
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| 268 | #else
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| 269 | bb_error_msg("feature ATF_MAGIC is not supported");
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| 270 | #endif
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| 271 | args++;
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| 272 | break;
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| 273 | case 6: /* "dev" */
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| 274 | if (*++args == NULL)
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| 275 | bb_show_usage();
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| 276 | device = *args;
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| 277 | args++;
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| 278 | break;
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| 279 | case 7: /* "netmask" */
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| 280 | if (*++args == NULL)
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| 281 | bb_show_usage();
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| 282 | if (strcmp(*args, "255.255.255.255") != 0) {
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| 283 | host = *args;
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| 284 | if (ap->input(host, &sa) < 0) {
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| 285 | bb_herror_msg_and_die("%s", host);
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| 286 | }
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| 287 | memcpy(&req.arp_netmask, &sa, sizeof(struct sockaddr));
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| 288 | flags |= ATF_NETMASK;
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| 289 | }
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| 290 | args++;
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| 291 | break;
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| 292 | default:
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| 293 | bb_show_usage();
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| 294 | break;
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| 295 | }
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| 296 | }
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| 297 |
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| 298 | /* Fill in the remainder of the request. */
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| 299 | req.arp_flags = flags;
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| 300 |
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| 301 | strncpy(req.arp_dev, device, sizeof(req.arp_dev));
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| 302 |
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| 303 | /* Call the kernel. */
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| 304 | if (option_mask32 & ARP_OPT_v)
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| 305 | bb_error_msg("SIOCSARP()");
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| 306 | xioctl(sockfd, SIOCSARP, &req);
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| 307 | return 0;
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| 308 | }
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| 309 |
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| 310 |
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| 311 | /* Print the contents of an ARP request block. */
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| 312 | static void
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| 313 | arp_disp(const char *name, char *ip, int type, int arp_flags,
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| 314 | char *hwa, char *mask, char *dev)
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| 315 | {
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| 316 | const struct hwtype *xhw;
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| 317 |
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| 318 | xhw = get_hwntype(type);
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| 319 | if (xhw == NULL)
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| 320 | xhw = get_hwtype(DFLT_HW);
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| 321 |
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| 322 | printf("%s (%s) at ", name, ip);
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| 323 |
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| 324 | if (!(arp_flags & ATF_COM)) {
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| 325 | if (arp_flags & ATF_PUBL)
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| 326 | printf("* ");
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| 327 | else
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| 328 | printf("<incomplete> ");
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| 329 | } else {
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| 330 | printf("%s [%s] ", hwa, xhw->name);
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| 331 | }
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| 332 |
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| 333 | if (arp_flags & ATF_NETMASK)
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| 334 | printf("netmask %s ", mask);
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| 335 |
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| 336 | if (arp_flags & ATF_PERM)
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| 337 | printf("PERM ");
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| 338 | if (arp_flags & ATF_PUBL)
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| 339 | printf("PUP ");
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| 340 | #ifdef HAVE_ATF_MAGIC
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| 341 | if (arp_flags & ATF_MAGIC)
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| 342 | printf("AUTO ");
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| 343 | #endif
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| 344 | #ifdef HAVE_ATF_DONTPUB
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| 345 | if (arp_flags & ATF_DONTPUB)
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| 346 | printf("DONTPUB ");
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| 347 | #endif
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| 348 | if (arp_flags & ATF_USETRAILERS)
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| 349 | printf("TRAIL ");
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| 350 |
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| 351 | printf("on %s\n", dev);
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| 352 | }
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| 353 |
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| 354 | /* Display the contents of the ARP cache in the kernel. */
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| 355 | /* Called only from main, once */
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| 356 | static int arp_show(char *name)
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| 357 | {
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| 358 | const char *host;
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| 359 | const char *hostname;
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| 360 | FILE *fp;
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| 361 | struct sockaddr sa;
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| 362 | int type, flags;
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| 363 | int num;
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| 364 | unsigned entries = 0, shown = 0;
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| 365 | char ip[128];
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| 366 | char hwa[128];
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| 367 | char mask[128];
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| 368 | char line[128];
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| 369 | char dev[128];
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| 370 |
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| 371 | host = NULL;
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| 372 | if (name != NULL) {
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| 373 | /* Resolve the host name. */
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| 374 | if (ap->input(name, &sa) < 0) {
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| 375 | bb_herror_msg_and_die("%s", name);
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| 376 | }
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| 377 | host = xstrdup(ap->sprint(&sa, 1));
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| 378 | }
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| 379 | fp = xfopen("/proc/net/arp", "r");
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| 380 | /* Bypass header -- read one line */
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| 381 | fgets(line, sizeof(line), fp);
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| 382 |
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| 383 | /* Read the ARP cache entries. */
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| 384 | while (fgets(line, sizeof(line), fp)) {
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| 385 |
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| 386 | mask[0] = '-'; mask[1] = '\0';
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| 387 | dev[0] = '-'; dev[1] = '\0';
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| 388 | /* All these strings can't overflow
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| 389 | * because fgets above reads limited amount of data */
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| 390 | num = sscanf(line, "%s 0x%x 0x%x %s %s %s\n",
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| 391 | ip, &type, &flags, hwa, mask, dev);
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| 392 | if (num < 4)
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| 393 | break;
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| 394 |
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| 395 | entries++;
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| 396 | /* if the user specified hw-type differs, skip it */
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| 397 | if (hw_set && (type != hw->type))
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| 398 | continue;
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| 399 |
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| 400 | /* if the user specified address differs, skip it */
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| 401 | if (host && strcmp(ip, host) != 0)
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| 402 | continue;
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| 403 |
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| 404 | /* if the user specified device differs, skip it */
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| 405 | if (device[0] && strcmp(dev, device) != 0)
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| 406 | continue;
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| 407 |
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| 408 | shown++;
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| 409 | /* This IS ugly but it works -be */
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| 410 | hostname = "?";
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| 411 | if (!(option_mask32 & ARP_OPT_n)) {
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| 412 | if (ap->input(ip, &sa) < 0)
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| 413 | hostname = ip;
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| 414 | else
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| 415 | hostname = ap->sprint(&sa, (option_mask32 & ARP_OPT_n) | 0x8000);
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| 416 | if (strcmp(hostname, ip) == 0)
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| 417 | hostname = "?";
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| 418 | }
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| 419 |
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| 420 | arp_disp(hostname, ip, type, flags, hwa, mask, dev);
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| 421 | }
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| 422 | if (option_mask32 & ARP_OPT_v)
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| 423 | printf("Entries: %d\tSkipped: %d\tFound: %d\n",
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| 424 | entries, entries - shown, shown);
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| 425 |
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| 426 | if (!shown) {
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| 427 | if (hw_set || host || device[0])
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| 428 | printf("No match found in %d entries\n", entries);
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| 429 | }
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| 430 | if (ENABLE_FEATURE_CLEAN_UP) {
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| 431 | free((char*)host);
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| 432 | fclose(fp);
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| 433 | }
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| 434 | return 0;
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| 435 | }
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| 436 |
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| 437 | int arp_main(int argc, char **argv);
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| 438 | int arp_main(int argc, char **argv)
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| 439 | {
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| 440 | char *hw_type;
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| 441 | char *protocol;
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| 442 |
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| 443 | /* Initialize variables... */
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| 444 | ap = get_aftype(DFLT_AF);
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| 445 | if (!ap)
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| 446 | bb_error_msg_and_die("%s: %s not supported", DFLT_AF, "address family");
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| 447 |
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| 448 | getopt32(argv, "A:p:H:t:i:adnDsv", &protocol, &protocol,
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| 449 | &hw_type, &hw_type, &device);
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| 450 | argv += optind;
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| 451 | if (option_mask32 & ARP_OPT_A || option_mask32 & ARP_OPT_p) {
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| 452 | ap = get_aftype(protocol);
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| 453 | if (ap == NULL)
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| 454 | bb_error_msg_and_die("%s: unknown %s", protocol, "address family");
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| 455 | }
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| 456 | if (option_mask32 & ARP_OPT_A || option_mask32 & ARP_OPT_p) {
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| 457 | hw = get_hwtype(hw_type);
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| 458 | if (hw == NULL)
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| 459 | bb_error_msg_and_die("%s: unknown %s", hw_type, "hardware type");
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| 460 | hw_set = 1;
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| 461 | }
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| 462 | //if (option_mask32 & ARP_OPT_i)... -i
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| 463 |
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| 464 | if (ap->af != AF_INET) {
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| 465 | bb_error_msg_and_die("%s: kernel only supports 'inet'", ap->name);
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| 466 | }
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| 467 |
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| 468 | /* If no hw type specified get default */
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| 469 | if (!hw) {
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| 470 | hw = get_hwtype(DFLT_HW);
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| 471 | if (!hw)
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| 472 | bb_error_msg_and_die("%s: %s not supported", DFLT_HW, "hardware type");
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| 473 | }
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| 474 |
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| 475 | if (hw->alen <= 0) {
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| 476 | bb_error_msg_and_die("%s: %s without ARP support",
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| 477 | hw->name, "hardware type");
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| 478 | }
|
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| 479 | sockfd = xsocket(AF_INET, SOCK_DGRAM, 0);
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| 480 |
|
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| 481 | /* Now see what we have to do here... */
|
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| 482 | if (option_mask32 & (ARP_OPT_d|ARP_OPT_s)) {
|
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| 483 | if (argv[0] == NULL)
|
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| 484 | bb_error_msg_and_die("need host name");
|
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| 485 | if (option_mask32 & ARP_OPT_s)
|
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| 486 | return arp_set(argv);
|
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| 487 | return arp_del(argv);
|
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| 488 | }
|
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| 489 | //if (option_mask32 & ARP_OPT_a) - default
|
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| 490 | return arp_show(argv[0]);
|
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| 491 | }
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