[BusyBox-cvs] busybox/networking arping.c,NONE,1.1 Config.in,1.6,1.7 Makefile.in,1.12,1.13
Glenn McGrath
bug1 at busybox.net
Thu Jan 9 10:06:06 UTC 2003
Update of /var/cvs/busybox/networking
In directory winder:/tmp/cvs-serv21412/networking
Modified Files:
Config.in Makefile.in
Added Files:
arping.c
Log Message:
arping applet by Nick Fedchik
--- NEW FILE: arping.c ---
/*
* 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.
*
* Author: Alexey Kuznetsov <kuznet at ms2.inr.ac.ru>
* Busybox port: Nick Fedchik <nick at fedchik.org.ua>
*/
#include <sys/ioctl.h>
#include <sys/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"
#define APPLET_NAME "arping"
struct in_addr src;
struct in_addr dst;
struct sockaddr_ll me;
struct sockaddr_ll he;
struct timeval last;
int dad;
int unsolicited;
int advert;
int quiet;
int quit_on_reply = 0;
int count = -1;
int timeout;
int unicasting;
int s;
int broadcast_only;
int sent;
int brd_sent;
int received;
int brd_recv;
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)
{
int err;
struct timeval now;
unsigned char buf[256];
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 = 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)
memcpy(p, &ME->sll_addr, ah->ar_hln);
else
memcpy(p, &HE->sll_addr, ah->ar_hln);
p += ah->ar_hln;
memcpy(p, dst_addr, 4);
p += 4;
gettimeofday(&now, NULL);
err = sendto(sock, buf, p - buf, 0, (struct sockaddr *) HE, sizeof(*HE));
if (err == p - buf) {
last = now;
sent++;
if (!unicasting)
brd_sent++;
}
return err;
}
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 (dad)
exit(!!received);
if (unsolicited)
exit(0);
exit(!received);
}
void catcher(void)
{
struct timeval tv;
struct timeval start;
gettimeofday(&tv, NULL);
if (start.tv_sec == 0)
start = tv;
if (count-- == 0
|| (timeout && MS_TDIFF(tv, start) > timeout * 1000 + 500))
finish();
if (last.tv_sec == 0 || MS_TDIFF(tv, last) > 500) {
send_pack(s, &src, &dst, &me, &he);
if (count == 0 && unsolicited)
finish();
}
alarm(1);
}
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)
return 0;
/* Only these types are recognised */
if (ah->ar_op != htons(ARPOP_REQUEST) && ah->ar_op != htons(ARPOP_REPLY))
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)))
return 0;
/* Protocol must be IP. */
if (ah->ar_pro != htons(ETH_P_IP))
return 0;
if (ah->ar_pln != 4)
return 0;
if (ah->ar_hln != me.sll_halen)
return 0;
if (len < sizeof(*ah) + 2 * (4 + ah->ar_hln))
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 (src_ip.s_addr != dst.s_addr)
return 0;
if (src.s_addr != dst_ip.s_addr)
return 0;
if (memcmp(p + ah->ar_hln + 4, &me.sll_addr, ah->ar_hln))
return 0;
} else {
/* DAD packet was:
src_ip = 0 (or some src)
src_hw = ME
dst_ip = tested address
dst_hw = <unspec>
We fail, if receive request/reply with:
src_ip = tested_address
src_hw != ME
if src_ip in request was not zero, check
also that it matches to dst_ip, otherwise
dst_ip/dst_hw do not matter.
*/
if (src_ip.s_addr != dst.s_addr)
return 0;
if (memcmp(p, &me.sll_addr, me.sll_halen) == 0)
return 0;
if (src.s_addr && src.s_addr != dst_ip.s_addr)
return 0;
}
if (!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));
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)) {
if (!s_printed)
printf("for ");
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;
long msecs = (usecs + 500) / 1000;
usecs -= msecs * 1000 - 500;
printf(" %ld.%03ldms\n", msecs, usecs);
} else {
printf(" UNSOLICITED?\n");
}
fflush(stdout);
}
received++;
if (FROM->sll_pkttype != PACKET_HOST)
brd_recv++;
if (ah->ar_op == htons(ARPOP_REQUEST))
req_recv++;
if (quit_on_reply)
finish();
if (!broadcast_only) {
memcpy(he.sll_addr, p, me.sll_halen);
unicasting = 1;
}
return 1;
}
int arping_main(int argc, char **argv)
{
int socket_errno;
int ch;
uid_t uid = getuid();
char *device = "eth0";
int ifindex = 0;
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':
device = optarg;
break;
case 'f':
quit_on_reply = 1;
break;
case 's':
source = optarg;
break;
case 'h':
case '?':
default:
show_usage();
}
}
argc -= optind;
argv += optind;
if (argc != 1)
show_usage();
target = *argv;
if (device == NULL) {
error_msg("-I <interface> is required!");
exit(1);
}
if (s < 0) {
error_msg("socket");
exit(socket_errno);
}
if (1) {
struct ifreq ifr;
memset(&ifr, 0, sizeof(ifr));
strncpy(ifr.ifr_name, device, IFNAMSIZ - 1);
if (ioctl(s, SIOCGIFINDEX, &ifr) < 0) {
error_msg("unknown interface %s", device);
exit(2);
}
ifindex = ifr.ifr_ifindex;
if (ioctl(s, SIOCGIFFLAGS, (char *) &ifr)) {
error_msg("SIOCGIFFLAGS");
exit(2);
}
if (!(ifr.ifr_flags & IFF_UP)) {
error_msg("Interface \"%s\" is down", device);
exit(2);
}
if (ifr.ifr_flags & (IFF_NOARP | IFF_LOOPBACK)) {
error_msg("Interface \"%s\" is not ARPable", device);
exit(dad ? 0 : 2);
}
}
if (inet_aton(target, &dst) != 1) {
struct hostent *hp;
hp = gethostbyname2(target, AF_INET);
if (!hp) {
error_msg("invalid or unknown target %s", target);
exit(2);
}
memcpy(&dst, hp->h_addr, 4);
}
if (source && inet_aton(source, &src) != 1) {
error_msg("invalid source address %s", source);
exit(2);
}
if (!dad && unsolicited && src.s_addr == 0)
src = dst;
if (!dad || src.s_addr) {
struct sockaddr_in saddr;
int probe_fd = socket(AF_INET, SOCK_DGRAM, 0);
if (probe_fd < 0) {
error_msg("socket");
exit(2);
}
if (device) {
if (setsockopt
(probe_fd, SOL_SOCKET, SO_BINDTODEVICE, device,
strlen(device) + 1) == -1)
perror("WARNING: interface is ignored");
}
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) {
error_msg("bind");
exit(2);
}
} else if (!dad) {
int on = 1;
int 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) {
error_msg("connect");
exit(2);
}
if (getsockname(probe_fd, (struct sockaddr *) &saddr, &alen) ==
-1) {
error_msg("getsockname");
exit(2);
}
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) {
error_msg("bind");
exit(2);
}
if (1) {
int alen = sizeof(me);
if (getsockname(s, (struct sockaddr *) &me, &alen) == -1) {
error_msg("getsockname");
exit(2);
}
}
if (me.sll_halen == 0) {
error_msg("Interface \"%s\" is not ARPable (no ll address)", device);
exit(dad ? 0 : 2);
}
he = me;
memset(he.sll_addr, -1, he.sll_halen);
if (!quiet)
printf("ARPING to %s from %s via %s\n", inet_ntoa(dst),
inet_ntoa(src), device ? device : "unknown");
if (!src.s_addr && !dad) {
error_msg("no src address in the non-DAD mode");
exit(2);
}
{
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);
}
catcher();
while (1) {
sigset_t sset, osset;
char packet[4096];
struct sockaddr_ll from;
int alen = sizeof(from);
int cc;
if ((cc = recvfrom(s, packet, sizeof(packet), 0,
(struct sockaddr *) &from, &alen)) < 0) {
perror("recvfrom");
continue;
}
sigemptyset(&sset);
sigaddset(&sset, SIGALRM);
sigaddset(&sset, SIGINT);
sigprocmask(SIG_BLOCK, &sset, &osset);
recv_pack(packet, cc, &from);
sigprocmask(SIG_SETMASK, &osset, NULL);
}
}
Index: Config.in
===================================================================
RCS file: /var/cvs/busybox/networking/Config.in,v
retrieving revision 1.6
retrieving revision 1.7
diff -u -d -r1.6 -r1.7
--- Config.in 5 Jan 2003 04:01:56 -0000 1.6
+++ Config.in 9 Jan 2003 10:06:01 -0000 1.7
@@ -11,6 +11,12 @@
help
Please submit a patch to add help text for this item.
+config CONFIG_ARPING
+ bool "arping"
+ default n
+ help
+ Ping hosts by ARP packets
+
config CONFIG_FTPGET
bool "ftpget"
default n
Index: Makefile.in
===================================================================
RCS file: /var/cvs/busybox/networking/Makefile.in,v
retrieving revision 1.12
retrieving revision 1.13
diff -u -d -r1.12 -r1.13
--- Makefile.in 5 Jan 2003 04:01:56 -0000 1.12
+++ Makefile.in 9 Jan 2003 10:06:01 -0000 1.13
@@ -23,6 +23,7 @@
endif
NETWORKING-y:=
+NETWORKING-$(CONFIG_ARPING) += arping.o
NETWORKING-$(CONFIG_FTPGET) += ftpgetput.o
NETWORKING-$(CONFIG_FTPPUT) += ftpgetput.o
NETWORKING-$(CONFIG_HOSTNAME) += hostname.o
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