/* 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>
*/
+//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 Duplicated address detection mode"
+//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 Time to wait for ARP reply, seconds"
+//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 <netinet/ether.h>
unsigned received;
unsigned brd_recv;
unsigned req_recv;
-};
+} FIX_ALIASING;
#define G (*(struct globals*)&bb_common_bufsiz1)
#define src (G.src )
#define dst (G.dst )
#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 { \
+ count = -1; \
+} while (0)
+
+// If GNUisms are not available...
+//static void *mempcpy(void *_dst, const void *_src, int n)
+//{
+// memcpy(_dst, _src, n);
+// return (char*)_dst + n;
+//}
static int send_pack(struct in_addr *src_addr,
struct in_addr *dst_addr, struct sockaddr_ll *ME,
struct arphdr *ah = (struct arphdr *) buf;
unsigned char *p = (unsigned char *) (ah + 1);
- ah->ar_hrd = htons(ME->sll_hatype);
ah->ar_hrd = htons(ARPHRD_ETHER);
ah->ar_pro = htons(ETH_P_IP);
ah->ar_hln = ME->sll_halen;
ah->ar_pln = 4;
ah->ar_op = option_mask32 & 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;
+ p = mempcpy(p, &ME->sll_addr, ah->ar_hln);
+ p = mempcpy(p, src_addr, 4);
if (option_mask32 & ADVERT)
- memcpy(p, &ME->sll_addr, ah->ar_hln);
+ p = mempcpy(p, &ME->sll_addr, ah->ar_hln);
else
- memcpy(p, &HE->sll_addr, ah->ar_hln);
- p += ah->ar_hln;
+ p = mempcpy(p, &HE->sll_addr, ah->ar_hln);
- memcpy(p, dst_addr, 4);
- p += 4;
+ p = mempcpy(p, dst_addr, 4);
err = sendto(sock_fd, buf, p - buf, 0, (struct sockaddr *) HE, sizeof(*HE));
if (err == p - buf) {
return err;
}
-static void finish(void) ATTRIBUTE_NORETURN;
+static void finish(void) NORETURN;
static void finish(void)
{
if (!(option_mask32 & QUIET)) {
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_MULTICAST)
return false;
- /* 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;
/* Protocol must be IP. */
if (ah->ar_pro != htons(ETH_P_IP)
- || (ah->ar_pln != 4)
- || (ah->ar_hln != me.sll_halen)
- || (len < sizeof(*ah) + 2 * (4 + ah->ar_hln)))
+ || (ah->ar_pln != 4)
+ || (ah->ar_hln != me.sll_halen)
+ || (len < (int)(sizeof(*ah) + 2 * (4 + ah->ar_hln))))
return false;
- 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;
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))
+ || (src.s_addr && src.s_addr != dst_ip.s_addr))
return false;
}
if (!(option_mask32 & QUIET)) {
} else {
printf(" UNSOLICITED?\n");
}
- fflush(stdout);
+ fflush_all();
}
received++;
if (FROM->sll_pkttype != PACKET_HOST)
}
int arping_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
-int arping_main(int argc, char **argv)
+int arping_main(int argc UNUSED_PARAM, char **argv)
{
const char *device = "eth0";
char *source = NULL;
err_str = xasprintf("interface %s %%s", device);
{
unsigned opt;
- char *str_count, *str_timeout;
+ char *str_timeout;
/* Dad also sets quit_on_reply.
* Advert also sets unsolicited.
*/
- opt_complementary = "=1:Df:AU";
+ opt_complementary = "=1:Df:AU:c+";
opt = getopt32(argv, "DUAqfbc:w:I:s:",
- &str_count, &str_timeout, &device, &source);
- if (opt & 0x40) /* -c: count */
- count = xatoi_u(str_count);
+ &count, &str_timeout, &device, &source);
if (opt & 0x80) /* -w: timeout */
timeout_us = xatou_range(str_timeout, 0, INT_MAX/2000000) * 1000000 + 500000;
//if (opt & 0x200) /* -s: source */
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) {
if (setsockopt(probe_fd, SOL_SOCKET, SO_DONTROUTE, &const_int_1, sizeof(const_int_1)) == -1)
bb_perror_msg("setsockopt(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)");
printf(" from %s via %s\n", inet_ntoa(src), device);
}
- {
- struct sigaction sa;
-
- memset(&sa, 0, sizeof(sa));
- sa.sa_flags = SA_RESTART;
-
- sa.sa_handler = (void (*)(int)) finish;
- sigaction(SIGINT, &sa, NULL);
-
- sa.sa_handler = (void (*)(int)) catcher;
- sigaction(SIGALRM, &sa, NULL);
- }
+ signal_SA_RESTART_empty_mask(SIGINT, (void (*)(int))finish);
+ signal_SA_RESTART_empty_mask(SIGALRM, (void (*)(int))catcher);
catcher();