+/* 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 <signal.h>
-#include <sys/time.h>
-
-#include <errno.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-
#include <arpa/inet.h>
#include <net/if.h>
#include <netinet/ether.h>
#include <netpacket/packet.h>
-#include "busybox.h"
+#include "libbb.h"
-#define APPLET_NAME "arping"
+/* We don't expect to see 1000+ seconds delay, unsigned is enough */
+#define MONOTONIC_US() ((unsigned)monotonic_us())
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;
-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
-static void set_signal(int signo, void (*handler) (void))
-{
- struct sigaction sa;
-
- memset(&sa, 0, sizeof(sa));
- sa.sa_handler = (void (*)(int)) handler;
- sa.sa_flags = SA_RESTART;
- sigaction(signo, &sa, NULL);
-}
-#endif
-
-static int send_pack(int sock, struct in_addr *src_addr,
- struct in_addr *dst_addr, struct sockaddr_ll *ME,
- struct sockaddr_ll *HE)
+static unsigned last;
+
+enum {
+ DAD = 1,
+ UNSOLICITED = 2,
+ ADVERT = 4,
+ QUIET = 8,
+ QUIT_ON_REPLY = 16,
+ BCAST_ONLY = 32,
+ UNICASTING = 64
+};
+
+static int sock;
+static unsigned count = UINT_MAX;
+static unsigned timeout_us;
+static unsigned sent;
+static unsigned brd_sent;
+static unsigned received;
+static unsigned brd_recv;
+static unsigned req_recv;
+
+static int send_pack(struct in_addr *src_addr,
+ struct in_addr *dst_addr, struct sockaddr_ll *ME,
+ struct sockaddr_ll *HE)
{
int err;
- struct timeval now;
+ unsigned now;
unsigned char 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 = 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;
- if (advert)
+ if (option_mask32 & ADVERT)
memcpy(p, &ME->sll_addr, ah->ar_hln);
else
memcpy(p, &HE->sll_addr, ah->ar_hln);
memcpy(p, dst_addr, 4);
p += 4;
- gettimeofday(&now, NULL);
+ now = MONOTONIC_US();
err = sendto(sock, buf, p - buf, 0, (struct sockaddr *) HE, sizeof(*HE));
if (err == p - buf) {
last = now;
sent++;
- if (!unicasting)
+ if (!(option_mask32 & UNICASTING))
brd_sent++;
}
return err;
}
+static void finish(void) ATTRIBUTE_NORETURN;
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 (brd_recv || req_recv) {
- printf(" (");
- if (req_recv)
- printf("%d request(s)", req_recv);
- if (brd_recv)
- printf("%s%d broadcast(s)", req_recv ? ", " : "", brd_recv);
- putchar(')');
- }
- putchar('\n');
- fflush(stdout);
+ if (!(option_mask32 & QUIET)) {
+ printf("Sent %u probe(s) (%u broadcast(s))\n"
+ "Received %u repl%s"
+ " (%u request(s), %u broadcast(s))\n",
+ sent, brd_sent,
+ received, (received == 1) ? "ies" : "y",
+ req_recv, brd_recv);
}
- if (dad)
+ if (option_mask32 & DAD)
exit(!!received);
- if (unsolicited)
+ if (option_mask32 & UNSOLICITED)
exit(0);
exit(!received);
}
static void catcher(void)
{
- struct timeval tv;
- static struct timeval start;
+ static unsigned start;
- gettimeofday(&tv, NULL);
+ unsigned now;
- if (start.tv_sec == 0)
- start = tv;
+ now = MONOTONIC_US();
+ if (start == 0)
+ start = now;
- if (count-- == 0
- || (timeout && MS_TDIFF(tv, start) > timeout * 1000 + 500))
+ if (count == 0 || (timeout_us && (now - start) > (timeout_us + 500000)))
finish();
- if (last.tv_sec == 0 || MS_TDIFF(tv, last) > 500) {
- send_pack(s, &src, &dst, &me, &he);
- if (count == 0 && unsolicited)
+ count--;
+
+ if (last == 0 || (now - last) > 500000) {
+ send_pack(&src, &dst, &me, &he);
+ if (count == 0 && (option_mask32 & 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 &&
- FROM->sll_pkttype != PACKET_MULTICAST)
+ if (FROM->sll_pkttype != PACKET_HOST
+ && FROM->sll_pkttype != PACKET_BROADCAST
+ && FROM->sll_pkttype != PACKET_MULTICAST)
return 0;
/* Only these types are recognised */
return 0;
/* 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)))
+ if (ah->ar_hrd != htons(FROM->sll_hatype)
+ && (FROM->sll_hatype != ARPHRD_FDDI || ah->ar_hrd != htons(ARPHRD_ETHER)))
return 0;
/* Protocol must be IP. */
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 (!(option_mask32 & 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 (!(option_mask32 & QUIET)) {
int s_printed = 0;
- 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));
+ printf("%scast re%s from %s [%s]",
+ 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));
if (dst_ip.s_addr != src.s_addr) {
printf("for %s ", inet_ntoa(dst_ip));
s_printed = 1;
if (!s_printed)
printf("for ");
printf("[%s]",
- ether_ntoa((struct ether_addr *) p + ah->ar_hln + 4));
+ 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;
- long msecs = (usecs + 500) / 1000;
- usecs -= msecs * 1000 - 500;
- printf(" %ld.%03ldms\n", msecs, usecs);
+ if (last) {
+ printf(" %u.%03ums\n", last / 1000, last % 1000);
} else {
printf(" UNSOLICITED?\n");
}
brd_recv++;
if (ah->ar_op == htons(ARPOP_REQUEST))
req_recv++;
- if (quit_on_reply)
+ if (option_mask32 & QUIT_ON_REPLY)
finish();
- if (!broadcast_only) {
+ if (!(option_mask32 & BCAST_ONLY)) {
memcpy(he.sll_addr, p, me.sll_halen);
- unicasting = 1;
+ option_mask32 |= UNICASTING;
}
return 1;
}
+int arping_main(int argc, char **argv);
int arping_main(int argc, char **argv)
{
- int socket_errno;
- int ch;
- uid_t uid = getuid();
- char *device = "eth0";
- int ifindex = 0;
+ const char *device = "eth0";
+ int ifindex;
char *source = NULL;
char *target;
+ unsigned char *packet;
- 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);
- }
- device = optarg;
- break;
- case 'f':
- quit_on_reply = 1;
- break;
- case 's':
- source = optarg;
- break;
- case 'h':
- case '?':
- default:
- bb_show_usage();
- }
- }
- argc -= optind;
- argv += optind;
-
- if (argc != 1)
- bb_show_usage();
+ sock = xsocket(PF_PACKET, SOCK_DGRAM, 0);
- target = *argv;
+ // Drop suid root privileges
+ xsetuid(getuid());
+ {
+ unsigned opt;
+ char *str_count, *str_timeout;
- if (s < 0) {
- bb_error_msg("socket");
- exit(socket_errno);
+ /* Dad also sets quit_on_reply.
+ * Advert also sets unsolicited.
+ */
+ opt_complementary = "=1:Df:AU";
+ opt = getopt32(argv, "DUAqfbc:w:I:s:",
+ &str_count, &str_timeout, &device, &source);
+ if (opt & 0x40) /* -c: count */
+ count = xatou(str_count);
+ if (opt & 0x80) /* -w: timeout */
+ timeout_us = xatou_range(str_timeout, 0, INT_MAX/2000000) * 1000000;
+ //if (opt & 0x100) /* -I: interface */
+ if (strlen(device) >= IF_NAMESIZE) {
+ bb_error_msg_and_die("interface name '%s' is too long",
+ device);
+ }
+ //if (opt & 0x200) /* -s: source */
+ option_mask32 &= 0x3f; /* set respective flags */
}
+ target = argv[optind];
+
+ xfunc_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);
- }
+ ioctl_or_perror_and_die(sock, SIOCGIFINDEX, &ifr, "interface %s not found", device);
ifindex = ifr.ifr_ifindex;
- if (ioctl(s, SIOCGIFFLAGS, (char *) &ifr)) {
- bb_error_msg("SIOCGIFFLAGS");
- exit(2);
- }
+ xioctl(sock, SIOCGIFFLAGS, (char *) &ifr);
+
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);
+ bb_error_msg("interface %s is not ARPable", device);
+ return (option_mask32 & DAD ? 0 : 2);
}
}
if (!inet_aton(target, &dst)) {
- struct hostent *hp;
-
- hp = gethostbyname2(target, AF_INET);
- if (!hp) {
- bb_error_msg("invalid or unknown target %s", target);
- exit(2);
- }
- memcpy(&dst, hp->h_addr, 4);
+ len_and_sockaddr *lsa;
+ lsa = xhost_and_af2sockaddr(target, 0, AF_INET);
+ memcpy(&dst, &lsa->sin.sin_addr.s_addr, 4);
+ if (ENABLE_FEATURE_CLEAN_UP)
+ free(lsa);
}
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 (!(option_mask32 & DAD) && (option_mask32 & UNSOLICITED) && src.s_addr == 0)
src = dst;
- if (!dad || src.s_addr) {
+ if (!(option_mask32 & DAD) || src.s_addr) {
struct sockaddr_in saddr;
- int probe_fd = socket(AF_INET, SOCK_DGRAM, 0);
+ int probe_fd = xsocket(AF_INET, SOCK_DGRAM, 0);
- if (probe_fd < 0) {
- bb_error_msg("socket");
- exit(2);
- }
if (device) {
- if (setsockopt
- (probe_fd, SOL_SOCKET, SO_BINDTODEVICE, device,
- strlen(device) + 1) == -1)
- bb_error_msg("WARNING: interface %s is ignored", device);
+ if (setsockopt(probe_fd, SOL_SOCKET, SO_BINDTODEVICE, device, strlen(device) + 1) == -1)
+ bb_error_msg("warning: interface %s is ignored", device);
}
memset(&saddr, 0, sizeof(saddr));
saddr.sin_family = AF_INET;
if (src.s_addr) {
saddr.sin_addr = src;
- if (bind(probe_fd, (struct sockaddr *) &saddr, sizeof(saddr)) == -1) {
- bb_error_msg("bind");
- exit(2);
- }
- } else if (!dad) {
- int on = 1;
+ xbind(probe_fd, (struct sockaddr *) &saddr, sizeof(saddr));
+ } else if (!(option_mask32 & DAD)) {
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)");
- if (connect(probe_fd, (struct sockaddr *) &saddr, sizeof(saddr))
- == -1) {
- bb_error_msg("connect");
- exit(2);
- }
- if (getsockname(probe_fd, (struct sockaddr *) &saddr, &alen) ==
- -1) {
- bb_error_msg("getsockname");
- exit(2);
+ if (setsockopt(probe_fd, SOL_SOCKET, SO_DONTROUTE, &const_int_1, sizeof(const_int_1)) == -1)
+ bb_perror_msg("warning: setsockopt(SO_DONTROUTE)");
+ xconnect(probe_fd, (struct sockaddr *) &saddr, sizeof(saddr));
+ if (getsockname(probe_fd, (struct sockaddr *) &saddr, &alen) == -1) {
+ bb_error_msg_and_die("getsockname");
}
src = saddr.sin_addr;
}
close(probe_fd);
- };
+ }
me.sll_family = AF_PACKET;
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);
- }
+ xbind(sock, (struct sockaddr *) &me, sizeof(me));
{
socklen_t alen = sizeof(me);
- if (getsockname(s, (struct sockaddr *) &me, &alen) == -1) {
- bb_error_msg("getsockname");
- exit(2);
+ if (getsockname(sock, (struct sockaddr *) &me, &alen) == -1) {
+ 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);
+ bb_error_msg("interface \"%s\" is not ARPable (no ll address)", device);
+ return (option_mask32 & 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 (!(option_mask32 & 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 && !(option_mask32 & DAD)) {
+ bb_error_msg_and_die("no src address in the non-DAD mode");
}
{
catcher();
+ packet = xmalloc(4096);
while (1) {
sigset_t sset, osset;
- unsigned char packet[4096];
struct sockaddr_ll from;
socklen_t alen = sizeof(from);
int cc;
- if ((cc = recvfrom(s, packet, sizeof(packet), 0,
- (struct sockaddr *) &from, &alen)) < 0) {
- perror("recvfrom");
+ cc = recvfrom(sock, packet, 4096, 0, (struct sockaddr *) &from, &alen);
+ if (cc < 0) {
+ bb_perror_msg("recvfrom");
continue;
}
sigemptyset(&sset);
projects / oweals / busybox.git / blobdiff