/* vi: set sw=4 ts=4: */
/*
- * arping.c - Ping hosts by ARP requests/replies
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
*
- * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
- *
- * Author: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
+ * Author: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
* Busybox port: Nick Fedchik <nick@fedchik.org.ua>
*/
+//config:config ARPING
+//config: bool "arping"
+//config: default y
+//config: select PLATFORM_LINUX
+//config: help
+//config: Ping hosts by ARP packets.
+//config:
+
+//applet:IF_ARPING(APPLET(arping, BB_DIR_USR_SBIN, BB_SUID_DROP))
+
+//kbuild:lib-$(CONFIG_ARPING) += arping.o
+
+//usage:#define arping_trivial_usage
+//usage: "[-fqbDUA] [-c CNT] [-w TIMEOUT] [-I IFACE] [-s SRC_IP] DST_IP"
+//usage:#define arping_full_usage "\n\n"
+//usage: "Send ARP requests/replies\n"
+//usage: "\n -f Quit on first ARP reply"
+//usage: "\n -q Quiet"
+//usage: "\n -b Keep broadcasting, don't go unicast"
+//usage: "\n -D Exit with 1 if DST_IP replies"
+//usage: "\n -U Unsolicited ARP mode, update your neighbors"
+//usage: "\n -A ARP answer mode, update your neighbors"
+//usage: "\n -c N Stop after sending N ARP requests"
+//usage: "\n -w TIMEOUT Seconds to wait for ARP reply"
+//usage: "\n -I IFACE Interface to use (default eth0)"
+//usage: "\n -s SRC_IP Sender IP address"
+//usage: "\n DST_IP Target IP address"
#include <arpa/inet.h>
#include <net/if.h>
#include <netpacket/packet.h>
#include "libbb.h"
+#include "common_bufsiz.h"
/* We don't expect to see 1000+ seconds delay, unsigned is enough */
#define MONOTONIC_US() ((unsigned)monotonic_us())
unsigned received;
unsigned brd_recv;
unsigned req_recv;
-};
-#define G (*(struct globals*)&bb_common_bufsiz1)
+} FIX_ALIASING;
+#define G (*(struct globals*)bb_common_bufsiz1)
#define src (G.src )
#define dst (G.dst )
#define me (G.me )
#define received (G.received )
#define brd_recv (G.brd_recv )
#define req_recv (G.req_recv )
-#define INIT_G() \
- do { \
- count = -1; \
- } while (0)
+#define INIT_G() do { \
+ setup_common_bufsiz(); \
+ count = -1; \
+} while (0)
// If GNUisms are not available...
//static void *mempcpy(void *_dst, const void *_src, int n)
return err;
}
-static void finish(void) ATTRIBUTE_NORETURN;
+static void finish(void) NORETURN;
static void finish(void)
{
if (!(option_mask32 & QUIET)) {
alarm(1);
}
-static bool recv_pack(unsigned char *buf, int len, struct sockaddr_ll *FROM)
+static void recv_pack(unsigned char *buf, int len, struct sockaddr_ll *FROM)
{
struct arphdr *ah = (struct arphdr *) buf;
unsigned char *p = (unsigned char *) (ah + 1);
struct in_addr src_ip, dst_ip;
+ /* moves below assume in_addr is 4 bytes big, ensure that */
+ struct BUG_in_addr_must_be_4 {
+ char BUG_in_addr_must_be_4[
+ sizeof(struct in_addr) == 4 ? 1 : -1
+ ];
+ char BUG_s_addr_must_be_4[
+ sizeof(src_ip.s_addr) == 4 ? 1 : -1
+ ];
+ };
/* Filter out wild packets */
if (FROM->sll_pkttype != PACKET_HOST
&& FROM->sll_pkttype != PACKET_BROADCAST
&& FROM->sll_pkttype != PACKET_MULTICAST)
- return false;
+ return;
- /* Only these types are recognised */
+ /* Only these types are recognized */
if (ah->ar_op != htons(ARPOP_REQUEST) && ah->ar_op != htons(ARPOP_REPLY))
- return false;
+ return;
/* ARPHRD check and this darned FDDI hack here :-( */
if (ah->ar_hrd != htons(FROM->sll_hatype)
&& (FROM->sll_hatype != ARPHRD_FDDI || ah->ar_hrd != htons(ARPHRD_ETHER)))
- return false;
+ return;
/* Protocol must be IP. */
if (ah->ar_pro != htons(ETH_P_IP)
- || (ah->ar_pln != 4)
- || (ah->ar_hln != me.sll_halen)
- || (len < (int)(sizeof(*ah) + 2 * (4 + ah->ar_hln))))
- return false;
+ || (ah->ar_pln != 4)
+ || (ah->ar_hln != me.sll_halen)
+ || (len < (int)(sizeof(*ah) + 2 * (4 + ah->ar_hln))))
+ return;
- memcpy(&src_ip, p + ah->ar_hln, 4);
- memcpy(&dst_ip, p + ah->ar_hln + 4 + ah->ar_hln, 4);
+ move_from_unaligned32(src_ip.s_addr, p + ah->ar_hln);
+ move_from_unaligned32(dst_ip.s_addr, p + ah->ar_hln + 4 + ah->ar_hln);
if (dst.s_addr != src_ip.s_addr)
- return false;
+ return;
if (!(option_mask32 & DAD)) {
if ((src.s_addr != dst_ip.s_addr)
- || (memcmp(p + ah->ar_hln + 4, &me.sll_addr, ah->ar_hln)))
- return false;
+ || (memcmp(p + ah->ar_hln + 4, &me.sll_addr, ah->ar_hln)))
+ return;
} else {
/* DAD packet was:
src_ip = 0 (or some src)
dst_ip/dst_hw do not matter.
*/
if ((memcmp(p, &me.sll_addr, me.sll_halen) == 0)
- || (src.s_addr && src.s_addr != dst_ip.s_addr))
- return false;
+ || (src.s_addr && src.s_addr != dst_ip.s_addr))
+ return;
}
if (!(option_mask32 & QUIET)) {
int s_printed = 0;
- printf("%scast re%s from %s [%s]",
+ printf("%scast re%s from %s [%02x:%02x:%02x:%02x:%02x:%02x]",
FROM->sll_pkttype == PACKET_HOST ? "Uni" : "Broad",
ah->ar_op == htons(ARPOP_REPLY) ? "ply" : "quest",
inet_ntoa(src_ip),
- ether_ntoa((struct ether_addr *) p));
+ p[0], p[1], p[2], p[3], p[4], p[5]
+ );
if (dst_ip.s_addr != src.s_addr) {
printf("for %s ", inet_ntoa(dst_ip));
s_printed = 1;
}
if (memcmp(p + ah->ar_hln + 4, me.sll_addr, ah->ar_hln)) {
+ unsigned char *pp = p + ah->ar_hln + 4;
if (!s_printed)
printf("for ");
- printf("[%s]",
- ether_ntoa((struct ether_addr *) p + ah->ar_hln + 4));
+ printf("[%02x:%02x:%02x:%02x:%02x:%02x]",
+ pp[0], pp[1], pp[2], pp[3], pp[4], pp[5]
+ );
}
if (last) {
unsigned diff = MONOTONIC_US() - last;
printf(" %u.%03ums\n", diff / 1000, diff % 1000);
} else {
- printf(" UNSOLICITED?\n");
+ puts(" UNSOLICITED?");
}
- fflush(stdout);
+ fflush_all();
}
received++;
if (FROM->sll_pkttype != PACKET_HOST)
memcpy(he.sll_addr, p, me.sll_halen);
option_mask32 |= UNICASTING;
}
- return true;
}
int arping_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
-int arping_main(int argc ATTRIBUTE_UNUSED, char **argv)
+int arping_main(int argc UNUSED_PARAM, char **argv)
{
const char *device = "eth0";
char *source = NULL;
// Need to remove SUID_NEVER from applets.h for this to work
//xsetuid(getuid());
- err_str = xasprintf("interface %s %%s", device);
{
unsigned opt;
char *str_timeout;
/* Dad also sets quit_on_reply.
* Advert also sets unsolicited.
*/
- opt_complementary = "=1:Df:AU:c+";
- opt = getopt32(argv, "DUAqfbc:w:I:s:",
+ opt_complementary = "=1:Df:AU";
+ opt = getopt32(argv, "DUAqfbc:+w:I:s:",
&count, &str_timeout, &device, &source);
if (opt & 0x80) /* -w: timeout */
timeout_us = xatou_range(str_timeout, 0, INT_MAX/2000000) * 1000000 + 500000;
}
target = argv[optind];
-
+ err_str = xasprintf("interface %s %%s", device);
xfunc_error_retval = 2;
{
struct ifreq ifr;
memset(&ifr, 0, sizeof(ifr));
- strncpy(ifr.ifr_name, device, sizeof(ifr.ifr_name) - 1);
+ strncpy_IFNAMSIZ(ifr.ifr_name, device);
/* We use ifr.ifr_name in error msg so that problem
* with truncated name will be visible */
ioctl_or_perror_and_die(sock_fd, SIOCGIFINDEX, &ifr, err_str, "not found");
/* if (!inet_aton(target, &dst)) - not needed */ {
len_and_sockaddr *lsa;
lsa = xhost_and_af2sockaddr(target, 0, AF_INET);
- memcpy(&dst, &lsa->u.sin.sin_addr.s_addr, 4);
+ dst = lsa->u.sin.sin_addr;
if (ENABLE_FEATURE_CLEAN_UP)
free(lsa);
}
struct sockaddr_in saddr;
int probe_fd = xsocket(AF_INET, SOCK_DGRAM, 0);
- if (setsockopt(probe_fd, SOL_SOCKET, SO_BINDTODEVICE, device, strlen(device) + 1) == -1)
- bb_perror_msg("cannot bind to device %s", device);
+ setsockopt_bindtodevice(probe_fd, device);
memset(&saddr, 0, sizeof(saddr));
saddr.sin_family = AF_INET;
if (src.s_addr) {
saddr.sin_port = htons(1025);
saddr.sin_addr = dst;
- if (setsockopt(probe_fd, SOL_SOCKET, SO_DONTROUTE, &const_int_1, sizeof(const_int_1)) == -1)
- bb_perror_msg("setsockopt(SO_DONTROUTE)");
+ if (setsockopt_SOL_SOCKET_1(probe_fd, SO_DONTROUTE) != 0)
+ bb_perror_msg("setsockopt(%s)", "SO_DONTROUTE");
xconnect(probe_fd, (struct sockaddr *) &saddr, sizeof(saddr));
- if (getsockname(probe_fd, (struct sockaddr *) &saddr, &alen) == -1) {
- bb_perror_msg_and_die("getsockname");
- }
+ getsockname(probe_fd, (struct sockaddr *) &saddr, &alen);
+ //never happens:
+ //if (getsockname(probe_fd, (struct sockaddr *) &saddr, &alen) == -1)
+ // bb_perror_msg_and_die("getsockname");
if (saddr.sin_family != AF_INET)
bb_error_msg_and_die("no IP address configured");
src = saddr.sin_addr;
{
socklen_t alen = sizeof(me);
-
- if (getsockname(sock_fd, (struct sockaddr *) &me, &alen) == -1) {
- bb_perror_msg_and_die("getsockname");
- }
+ getsockname(sock_fd, (struct sockaddr *) &me, &alen);
+ //never happens:
+ //if (getsockname(sock_fd, (struct sockaddr *) &me, &alen) == -1)
+ // bb_perror_msg_and_die("getsockname");
}
if (me.sll_halen == 0) {
bb_error_msg(err_str, "is not ARPable (no ll address)");
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