+/* vi: set sw=4 ts=4: */
/*
* arping.c - Ping hosts by ARP requests/replies
*
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*
* Author: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
* Busybox port: Nick Fedchik <nick@fedchik.org.ua>
*/
#include <sys/ioctl.h>
-#include <sys/signal.h>
-#include <sys/time.h>
+#include <signal.h>
#include <errno.h>
#include <stdlib.h>
#include "busybox.h"
-#define APPLET_NAME "arping"
-
static struct in_addr src;
static struct in_addr dst;
static struct sockaddr_ll me;
static struct sockaddr_ll he;
static struct timeval last;
-static int dad;
-static int unsolicited;
-static int advert;
-static int quiet;
-static int quit_on_reply = 0;
+
+enum cfg_e {
+ dad = 1,
+ unsolicited = 2,
+ advert = 4,
+ quiet = 8,
+ quit_on_reply = 16,
+ broadcast_only = 32,
+ unicasting = 64
+};
+static int cfg;
+
+static int s;
static int count = -1;
static int timeout;
-static int unicasting;
-static int s;
-static int broadcast_only;
static int sent;
static int brd_sent;
static int received;
static int brd_recv;
static int req_recv;
+
#define MS_TDIFF(tv1,tv2) ( ((tv1).tv_sec-(tv2).tv_sec)*1000 + \
((tv1).tv_usec-(tv2).tv_usec)/1000 )
#if 0
{
int err;
struct timeval now;
- unsigned char buf[256];
+ RESERVE_CONFIG_UBUFFER(buf, 256);
struct arphdr *ah = (struct arphdr *) buf;
unsigned char *p = (unsigned char *) (ah + 1);
ah->ar_pro = htons(ETH_P_IP);
ah->ar_hln = ME->sll_halen;
ah->ar_pln = 4;
- ah->ar_op = advert ? htons(ARPOP_REPLY) : htons(ARPOP_REQUEST);
+ ah->ar_op = cfg&advert ? htons(ARPOP_REPLY) : htons(ARPOP_REQUEST);
memcpy(p, &ME->sll_addr, ah->ar_hln);
p += ME->sll_halen;
memcpy(p, src_addr, 4);
p += 4;
- if (advert)
+ if (cfg&advert)
memcpy(p, &ME->sll_addr, ah->ar_hln);
else
memcpy(p, &HE->sll_addr, ah->ar_hln);
if (err == p - buf) {
last = now;
sent++;
- if (!unicasting)
+ if (!(cfg&unicasting))
brd_sent++;
}
+ RELEASE_CONFIG_BUFFER(buf);
return err;
}
static void finish(void)
{
- if (!quiet) {
- printf("Sent %d probes (%d broadcast(s))\n", sent, brd_sent);
- printf("Received %d repl%s", received, (received > 1) ? "ies" : "y");
+ if (!(cfg&quiet)) {
+ printf("Sent %d probes (%d broadcast(s))\n"
+ "Received %d repl%s",
+ sent, brd_sent,
+ received, (received > 1) ? "ies" : "y");
if (brd_recv || req_recv) {
printf(" (");
if (req_recv)
putchar('\n');
fflush(stdout);
}
- if (dad)
+ if (cfg&dad)
exit(!!received);
- if (unsolicited)
+ if (cfg&unsolicited)
exit(0);
exit(!received);
}
if (last.tv_sec == 0 || MS_TDIFF(tv, last) > 500) {
send_pack(s, &src, &dst, &me, &he);
- if (count == 0 && unsolicited)
+ if (count == 0 && cfg&unsolicited)
finish();
}
alarm(1);
static int recv_pack(unsigned char *buf, int len, struct sockaddr_ll *FROM)
{
- struct timeval tv;
struct arphdr *ah = (struct arphdr *) buf;
unsigned char *p = (unsigned char *) (ah + 1);
struct in_addr src_ip, dst_ip;
- gettimeofday(&tv, NULL);
-
/* Filter out wild packets */
if (FROM->sll_pkttype != PACKET_HOST &&
FROM->sll_pkttype != PACKET_BROADCAST &&
return 0;
memcpy(&src_ip, p + ah->ar_hln, 4);
memcpy(&dst_ip, p + ah->ar_hln + 4 + ah->ar_hln, 4);
- if (!dad) {
+ if (!(cfg&dad)) {
if (src_ip.s_addr != dst.s_addr)
return 0;
if (src.s_addr != dst_ip.s_addr)
if (src.s_addr && src.s_addr != dst_ip.s_addr)
return 0;
}
- if (!quiet) {
+ if (!(cfg&quiet)) {
int s_printed = 0;
+ struct timeval tv;
- printf("%s ",
- FROM->sll_pkttype == PACKET_HOST ? "Unicast" : "Broadcast");
- printf("%s from ",
- ah->ar_op == htons(ARPOP_REPLY) ? "reply" : "request");
- printf("%s ", inet_ntoa(src_ip));
- printf("[%s]", ether_ntoa((struct ether_addr *) p));
+ gettimeofday(&tv, NULL);
+
+ printf("%s %s from %s [%s]",
+ FROM->sll_pkttype == PACKET_HOST ? "Unicast" : "Broadcast",
+ ah->ar_op == htons(ARPOP_REPLY) ? "reply" : "request",
+ inet_ntoa(src_ip),
+ ether_ntoa((struct ether_addr *) p));
if (dst_ip.s_addr != src.s_addr) {
printf("for %s ", inet_ntoa(dst_ip));
s_printed = 1;
printf("[%s]",
ether_ntoa((struct ether_addr *) p + ah->ar_hln + 4));
}
+
if (last.tv_sec) {
long usecs = (tv.tv_sec - last.tv_sec) * 1000000 +
tv.tv_usec - last.tv_usec;
brd_recv++;
if (ah->ar_op == htons(ARPOP_REQUEST))
req_recv++;
- if (quit_on_reply)
+ if (cfg&quit_on_reply)
finish();
- if (!broadcast_only) {
+ if (!(cfg&broadcast_only)) {
memcpy(he.sll_addr, p, me.sll_halen);
- unicasting = 1;
+ cfg |= unicasting;
}
return 1;
}
int arping_main(int argc, char **argv)
{
- int socket_errno;
- int ch;
- uid_t uid = getuid();
char *device = "eth0";
- int ifindex = 0;
+ int ifindex;
char *source = NULL;
char *target;
s = socket(PF_PACKET, SOCK_DGRAM, 0);
- socket_errno = errno;
-
- setuid(uid);
-
- while ((ch = getopt(argc, argv, "h?bfDUAqc:w:s:I:")) != EOF) {
- switch (ch) {
- case 'b':
- broadcast_only = 1;
- break;
- case 'D':
- dad++;
- quit_on_reply = 1;
- break;
- case 'U':
- unsolicited++;
- break;
- case 'A':
- advert++;
- unsolicited++;
- break;
- case 'q':
- quiet++;
- break;
- case 'c':
- count = atoi(optarg);
- break;
- case 'w':
- timeout = atoi(optarg);
- break;
- case 'I':
- if (optarg == NULL)
- bb_show_usage();
- if (bb_strlen(optarg) > IF_NAMESIZE) {
- bb_error_msg("Interface name `%s' must be less than %d", optarg,
- IF_NAMESIZE);
- exit(2);
+ ifindex = errno;
+
+ setuid(getuid());
+
+ {
+ unsigned long opt;
+ char *_count, *_timeout, *_device;
+
+ /* Dad also sets quit_on_reply.
+ * Advert also sets unsolicited.
+ */
+ bb_opt_complementally = "Df:AU";
+ opt = bb_getopt_ulflags(argc, argv, "DUAqfbc:w:i:s:",
+ &_count, &_timeout, &_device);
+ cfg |= opt & 63; /* set respective flags */
+ if (opt & 64) /* count */
+ count = atoi(_count);
+ if (opt & 128) /* timeout */
+ timeout = atoi(_timeout);
+ if (opt & 256) { /* interface */
+ if (strlen(_device) > IF_NAMESIZE) {
+ bb_error_msg_and_die("Interface name `%s' must be less than %d",
+ _device, IF_NAMESIZE);
}
- device = optarg;
- break;
- case 'f':
- quit_on_reply = 1;
- break;
- case 's':
- source = optarg;
- break;
- case 'h':
- case '?':
- default:
- bb_show_usage();
+ device = _device;
}
+ if (opt & 512) /* source */
+ source = optarg;
}
argc -= optind;
argv += optind;
if (s < 0) {
- bb_error_msg("socket");
- exit(socket_errno);
+ bb_default_error_retval = ifindex;
+ bb_perror_msg_and_die("socket");
}
+ bb_default_error_retval = 2;
{
struct ifreq ifr;
memset(&ifr, 0, sizeof(ifr));
strncpy(ifr.ifr_name, device, IFNAMSIZ - 1);
if (ioctl(s, SIOCGIFINDEX, &ifr) < 0) {
- bb_error_msg("Interface %s not found", device);
- exit(2);
+ bb_error_msg_and_die("Interface %s not found", device);
}
ifindex = ifr.ifr_ifindex;
if (ioctl(s, SIOCGIFFLAGS, (char *) &ifr)) {
- bb_error_msg("SIOCGIFFLAGS");
- exit(2);
+ bb_error_msg_and_die("SIOCGIFFLAGS");
}
if (!(ifr.ifr_flags & IFF_UP)) {
- bb_error_msg("Interface %s is down", device);
- exit(2);
+ bb_error_msg_and_die("Interface %s is down", device);
}
if (ifr.ifr_flags & (IFF_NOARP | IFF_LOOPBACK)) {
bb_error_msg("Interface %s is not ARPable", device);
- exit(dad ? 0 : 2);
+ exit(cfg&dad ? 0 : 2);
}
}
hp = gethostbyname2(target, AF_INET);
if (!hp) {
- bb_error_msg("invalid or unknown target %s", target);
- exit(2);
+ bb_error_msg_and_die("invalid or unknown target %s", target);
}
memcpy(&dst, hp->h_addr, 4);
}
if (source && !inet_aton(source, &src)) {
- bb_error_msg("invalid source address %s", source);
- exit(2);
+ bb_error_msg_and_die("invalid source address %s", source);
}
- if (!dad && unsolicited && src.s_addr == 0)
+ if (!(cfg&dad) && cfg&unsolicited && src.s_addr == 0)
src = dst;
- if (!dad || src.s_addr) {
+ if (!(cfg&dad) || src.s_addr) {
struct sockaddr_in saddr;
- int probe_fd = socket(AF_INET, SOCK_DGRAM, 0);
+ int probe_fd = socket(AF_INET, SOCK_DGRAM, 0); /* maybe use bb_xsocket? */
if (probe_fd < 0) {
- bb_error_msg("socket");
- exit(2);
+ bb_error_msg_and_die("socket");
}
if (device) {
if (setsockopt
if (src.s_addr) {
saddr.sin_addr = src;
if (bind(probe_fd, (struct sockaddr *) &saddr, sizeof(saddr)) == -1) {
- bb_error_msg("bind");
- exit(2);
+ bb_error_msg_and_die("bind");
}
- } else if (!dad) {
+ } else if (!(cfg&dad)) {
int on = 1;
- int alen = sizeof(saddr);
+ socklen_t alen = sizeof(saddr);
saddr.sin_port = htons(1025);
saddr.sin_addr = dst;
if (setsockopt
(probe_fd, SOL_SOCKET, SO_DONTROUTE, (char *) &on,
sizeof(on)) == -1)
- perror("WARNING: setsockopt(SO_DONTROUTE)");
+ bb_perror_msg("WARNING: setsockopt(SO_DONTROUTE)");
if (connect(probe_fd, (struct sockaddr *) &saddr, sizeof(saddr))
== -1) {
- bb_error_msg("connect");
- exit(2);
+ bb_error_msg_and_die("connect");
}
if (getsockname(probe_fd, (struct sockaddr *) &saddr, &alen) ==
-1) {
- bb_error_msg("getsockname");
- exit(2);
+ bb_error_msg_and_die("getsockname");
}
src = saddr.sin_addr;
}
me.sll_ifindex = ifindex;
me.sll_protocol = htons(ETH_P_ARP);
if (bind(s, (struct sockaddr *) &me, sizeof(me)) == -1) {
- bb_error_msg("bind");
- exit(2);
+ bb_error_msg_and_die("bind");
}
{
- int alen = sizeof(me);
+ socklen_t alen = sizeof(me);
if (getsockname(s, (struct sockaddr *) &me, &alen) == -1) {
- bb_error_msg("getsockname");
- exit(2);
+ bb_error_msg_and_die("getsockname");
}
}
if (me.sll_halen == 0) {
bb_error_msg("Interface \"%s\" is not ARPable (no ll address)", device);
- exit(dad ? 0 : 2);
+ exit(cfg&dad ? 0 : 2);
}
he = me;
memset(he.sll_addr, -1, he.sll_halen);
- if (!quiet) {
- printf("ARPING to %s", inet_ntoa(dst));
- printf(" from %s via %s\n", inet_ntoa(src),
- device ? device : "unknown");
+ if (!(cfg&quiet)) {
+ printf("ARPING to %s from %s via %s\n",
+ inet_ntoa(dst), inet_ntoa(src),
+ device ? device : "unknown");
}
- if (!src.s_addr && !dad) {
- bb_error_msg("no src address in the non-DAD mode");
- exit(2);
+ if (!src.s_addr && !(cfg&dad)) {
+ bb_error_msg_and_die("no src address in the non-DAD mode");
}
{
while (1) {
sigset_t sset, osset;
- char packet[4096];
+ RESERVE_CONFIG_UBUFFER(packet, 4096);
struct sockaddr_ll from;
- int alen = sizeof(from);
+ socklen_t alen = sizeof(from);
int cc;
- if ((cc = recvfrom(s, packet, sizeof(packet), 0,
+ if ((cc = recvfrom(s, packet, 4096, 0,
(struct sockaddr *) &from, &alen)) < 0) {
perror("recvfrom");
continue;
sigprocmask(SIG_BLOCK, &sset, &osset);
recv_pack(packet, cc, &from);
sigprocmask(SIG_SETMASK, &osset, NULL);
+ RELEASE_CONFIG_BUFFER(packet);
}
}
projects / oweals / busybox.git / blobdiff