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Shrink patch from Bernhard Fischer.

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This commit is contained in:
Rob Landley 2006-03-30 21:50:57 +00:00
parent 1f6dc6d358
commit 8ea5205726
1 changed files with 69 additions and 81 deletions
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150
networking/arping.c
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@ -1,10 +1,8 @@
/* vi:set ts=4:*/
/* /*
* arping.c - Ping hosts by ARP requests/replies * arping.c - Ping hosts by ARP requests/replies
* *
* This program is free software; you can redistribute it and/or * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
* 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@ms2.inr.ac.ru> * Author: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
* Busybox port: Nick Fedchik <nick@fedchik.org.ua> * Busybox port: Nick Fedchik <nick@fedchik.org.ua>
@ -26,29 +24,32 @@
#include "busybox.h" #include "busybox.h"
#define APPLET_NAME "arping"
static struct in_addr src; static struct in_addr src;
static struct in_addr dst; static struct in_addr dst;
static struct sockaddr_ll me; static struct sockaddr_ll me;
static struct sockaddr_ll he; static struct sockaddr_ll he;
static struct timeval last; static struct timeval last;
static int dad; struct cfg_s {
static int unsolicited; int dad:1;
static int advert; int unsolicited:1;
static int quiet; int advert:1;
static int quit_on_reply = 0; int quiet:1;
int quit_on_reply:1;
int unicasting:1;
int broadcast_only:1;
};
static struct cfg_s cfg;
static int s;
static int count = -1; static int count = -1;
static int timeout; static int timeout;
static int unicasting;
static int s;
static int broadcast_only;
static int sent; static int sent;
static int brd_sent; static int brd_sent;
static int received; static int received;
static int brd_recv; static int brd_recv;
static int req_recv; static int req_recv;
#define MS_TDIFF(tv1,tv2) ( ((tv1).tv_sec-(tv2).tv_sec)*1000 + \ #define MS_TDIFF(tv1,tv2) ( ((tv1).tv_sec-(tv2).tv_sec)*1000 + \
((tv1).tv_usec-(tv2).tv_usec)/1000 ) ((tv1).tv_usec-(tv2).tv_usec)/1000 )
#if 0 #if 0
@ -69,7 +70,7 @@ static int send_pack(int sock, struct in_addr *src_addr,
{ {
int err; int err;
struct timeval now; struct timeval now;
unsigned char buf[256]; RESERVE_CONFIG_UBUFFER(buf, 256);
struct arphdr *ah = (struct arphdr *) buf; struct arphdr *ah = (struct arphdr *) buf;
unsigned char *p = (unsigned char *) (ah + 1); unsigned char *p = (unsigned char *) (ah + 1);
@ -78,7 +79,7 @@ static int send_pack(int sock, struct in_addr *src_addr,
ah->ar_pro = htons(ETH_P_IP); ah->ar_pro = htons(ETH_P_IP);
ah->ar_hln = ME->sll_halen; ah->ar_hln = ME->sll_halen;
ah->ar_pln = 4; 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); memcpy(p, &ME->sll_addr, ah->ar_hln);
p += ME->sll_halen; p += ME->sll_halen;
@ -86,7 +87,7 @@ static int send_pack(int sock, struct in_addr *src_addr,
memcpy(p, src_addr, 4); memcpy(p, src_addr, 4);
p += 4; p += 4;
if (advert) if (cfg.advert)
memcpy(p, &ME->sll_addr, ah->ar_hln); memcpy(p, &ME->sll_addr, ah->ar_hln);
else else
memcpy(p, &HE->sll_addr, ah->ar_hln); memcpy(p, &HE->sll_addr, ah->ar_hln);
@ -100,15 +101,16 @@ static int send_pack(int sock, struct in_addr *src_addr,
if (err == p - buf) { if (err == p - buf) {
last = now; last = now;
sent++; sent++;
if (!unicasting) if (!cfg.unicasting)
brd_sent++; brd_sent++;
} }
RELEASE_CONFIG_BUFFER(buf);
return err; return err;
} }
static void finish(void) static void finish(void)
{ {
if (!quiet) { if (!cfg.quiet) {
printf("Sent %d probes (%d broadcast(s))\n", sent, brd_sent); printf("Sent %d probes (%d broadcast(s))\n", sent, brd_sent);
printf("Received %d repl%s", received, (received > 1) ? "ies" : "y"); printf("Received %d repl%s", received, (received > 1) ? "ies" : "y");
if (brd_recv || req_recv) { if (brd_recv || req_recv) {
@ -122,9 +124,9 @@ static void finish(void)
putchar('\n'); putchar('\n');
fflush(stdout); fflush(stdout);
} }
if (dad) if (cfg.dad)
exit(!!received); exit(!!received);
if (unsolicited) if (cfg.unsolicited)
exit(0); exit(0);
exit(!received); exit(!received);
} }
@ -145,7 +147,7 @@ static void catcher(void)
if (last.tv_sec == 0 || MS_TDIFF(tv, last) > 500) { if (last.tv_sec == 0 || MS_TDIFF(tv, last) > 500) {
send_pack(s, &src, &dst, &me, &he); send_pack(s, &src, &dst, &me, &he);
if (count == 0 && unsolicited) if (count == 0 && cfg.unsolicited)
finish(); finish();
} }
alarm(1); alarm(1);
@ -153,13 +155,10 @@ static void catcher(void)
static int recv_pack(unsigned char *buf, int len, struct sockaddr_ll *FROM) static int recv_pack(unsigned char *buf, int len, struct sockaddr_ll *FROM)
{ {
struct timeval tv;
struct arphdr *ah = (struct arphdr *) buf; struct arphdr *ah = (struct arphdr *) buf;
unsigned char *p = (unsigned char *) (ah + 1); unsigned char *p = (unsigned char *) (ah + 1);
struct in_addr src_ip, dst_ip; struct in_addr src_ip, dst_ip;
gettimeofday(&tv, NULL);
/* Filter out wild packets */ /* Filter out wild packets */
if (FROM->sll_pkttype != PACKET_HOST && if (FROM->sll_pkttype != PACKET_HOST &&
FROM->sll_pkttype != PACKET_BROADCAST && FROM->sll_pkttype != PACKET_BROADCAST &&
@ -187,7 +186,7 @@ static int recv_pack(unsigned char *buf, int len, struct sockaddr_ll *FROM)
return 0; return 0;
memcpy(&src_ip, p + ah->ar_hln, 4); memcpy(&src_ip, p + ah->ar_hln, 4);
memcpy(&dst_ip, p + ah->ar_hln + 4 + 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) if (src_ip.s_addr != dst.s_addr)
return 0; return 0;
if (src.s_addr != dst_ip.s_addr) if (src.s_addr != dst_ip.s_addr)
@ -215,8 +214,11 @@ static int recv_pack(unsigned char *buf, int len, struct sockaddr_ll *FROM)
if (src.s_addr && src.s_addr != dst_ip.s_addr) if (src.s_addr && src.s_addr != dst_ip.s_addr)
return 0; return 0;
} }
if (!quiet) { if (!cfg.quiet) {
int s_printed = 0; int s_printed = 0;
struct timeval tv;
gettimeofday(&tv, NULL);
printf("%s ", printf("%s ",
FROM->sll_pkttype == PACKET_HOST ? "Unicast" : "Broadcast"); FROM->sll_pkttype == PACKET_HOST ? "Unicast" : "Broadcast");
@ -234,6 +236,7 @@ static int recv_pack(unsigned char *buf, int len, struct sockaddr_ll *FROM)
printf("[%s]", 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) { if (last.tv_sec) {
long usecs = (tv.tv_sec - last.tv_sec) * 1000000 + long usecs = (tv.tv_sec - last.tv_sec) * 1000000 +
tv.tv_usec - last.tv_usec; tv.tv_usec - last.tv_usec;
@ -251,48 +254,46 @@ static int recv_pack(unsigned char *buf, int len, struct sockaddr_ll *FROM)
brd_recv++; brd_recv++;
if (ah->ar_op == htons(ARPOP_REQUEST)) if (ah->ar_op == htons(ARPOP_REQUEST))
req_recv++; req_recv++;
if (quit_on_reply) if (cfg.quit_on_reply)
finish(); finish();
if (!broadcast_only) { if (!cfg.broadcast_only) {
memcpy(he.sll_addr, p, me.sll_halen); memcpy(he.sll_addr, p, me.sll_halen);
unicasting = 1; cfg.unicasting = 1;
} }
return 1; return 1;
} }
int arping_main(int argc, char **argv) int arping_main(int argc, char **argv)
{ {
int socket_errno;
int ch; int ch;
uid_t uid = getuid();
char *device = "eth0"; char *device = "eth0";
int ifindex = 0; int ifindex;
char *source = NULL; char *source = NULL;
char *target; char *target;
s = socket(PF_PACKET, SOCK_DGRAM, 0); s = socket(PF_PACKET, SOCK_DGRAM, 0);
socket_errno = errno; ifindex = errno;
setuid(uid); setuid(getuid());
while ((ch = getopt(argc, argv, "h?bfDUAqc:w:s:I:")) != EOF) { while ((ch = getopt(argc, argv, "h?bfDUAqc:w:s:I:")) != EOF) {
switch (ch) { switch (ch) {
case 'b': case 'b':
broadcast_only = 1; cfg.broadcast_only = 1;
break; break;
case 'D': case 'D':
dad++; cfg.dad = 1;
quit_on_reply = 1; cfg.quit_on_reply = 1;
break; break;
case 'U': case 'U':
unsolicited++; cfg.unsolicited = 1;
break; break;
case 'A': case 'A':
advert++; cfg.advert = 1;
unsolicited++; cfg.unsolicited = 1;
break; break;
case 'q': case 'q':
quiet++; cfg.quiet = 1;
break; break;
case 'c': case 'c':
count = atoi(optarg); count = atoi(optarg);
@ -304,14 +305,13 @@ int arping_main(int argc, char **argv)
if (optarg == NULL) if (optarg == NULL)
bb_show_usage(); bb_show_usage();
if (bb_strlen(optarg) > IF_NAMESIZE) { if (bb_strlen(optarg) > IF_NAMESIZE) {
bb_error_msg("Interface name `%s' must be less than %d", optarg, bb_error_msg_and_die("Interface name `%s' must be less than %d",
IF_NAMESIZE); optarg, IF_NAMESIZE);
exit(2);
} }
device = optarg; device = optarg;
break; break;
case 'f': case 'f':
quit_on_reply = 1; cfg.quit_on_reply = 1;
break; break;
case 's': case 's':
source = optarg; source = optarg;
@ -329,11 +329,11 @@ int arping_main(int argc, char **argv)
bb_show_usage(); bb_show_usage();
target = *argv; target = *argv;
bb_default_error_retval = 2;
if (s < 0) { if (s < 0) {
bb_error_msg("socket"); bb_perror_msg("socket");
exit(socket_errno); exit(ifindex);
} }
{ {
@ -342,22 +342,19 @@ int arping_main(int argc, char **argv)
memset(&ifr, 0, sizeof(ifr)); memset(&ifr, 0, sizeof(ifr));
strncpy(ifr.ifr_name, device, IFNAMSIZ - 1); strncpy(ifr.ifr_name, device, IFNAMSIZ - 1);
if (ioctl(s, SIOCGIFINDEX, &ifr) < 0) { if (ioctl(s, SIOCGIFINDEX, &ifr) < 0) {
bb_error_msg("Interface %s not found", device); bb_error_msg_and_die("Interface %s not found", device);
exit(2);
} }
ifindex = ifr.ifr_ifindex; ifindex = ifr.ifr_ifindex;
if (ioctl(s, SIOCGIFFLAGS, (char *) &ifr)) { if (ioctl(s, SIOCGIFFLAGS, (char *) &ifr)) {
bb_error_msg("SIOCGIFFLAGS"); bb_error_msg_and_die("SIOCGIFFLAGS");
exit(2);
} }
if (!(ifr.ifr_flags & IFF_UP)) { if (!(ifr.ifr_flags & IFF_UP)) {
bb_error_msg("Interface %s is down", device); bb_error_msg_and_die("Interface %s is down", device);
exit(2);
} }
if (ifr.ifr_flags & (IFF_NOARP | IFF_LOOPBACK)) { if (ifr.ifr_flags & (IFF_NOARP | IFF_LOOPBACK)) {
bb_error_msg("Interface %s is not ARPable", device); bb_error_msg("Interface %s is not ARPable", device);
exit(dad ? 0 : 2); exit(cfg.dad ? 0 : 2);
} }
} }
@ -366,27 +363,24 @@ int arping_main(int argc, char **argv)
hp = gethostbyname2(target, AF_INET); hp = gethostbyname2(target, AF_INET);
if (!hp) { if (!hp) {
bb_error_msg("invalid or unknown target %s", target); bb_error_msg_and_die("invalid or unknown target %s", target);
exit(2);
} }
memcpy(&dst, hp->h_addr, 4); memcpy(&dst, hp->h_addr, 4);
} }
if (source && !inet_aton(source, &src)) { if (source && !inet_aton(source, &src)) {
bb_error_msg("invalid source address %s", source); bb_error_msg_and_die("invalid source address %s", source);
exit(2);
} }
if (!dad && unsolicited && src.s_addr == 0) if (!cfg.dad && cfg.unsolicited && src.s_addr == 0)
src = dst; src = dst;
if (!dad || src.s_addr) { if (!cfg.dad || src.s_addr) {
struct sockaddr_in saddr; struct sockaddr_in saddr;
int probe_fd = socket(AF_INET, SOCK_DGRAM, 0); int probe_fd = socket(AF_INET, SOCK_DGRAM, 0);
if (probe_fd < 0) { if (probe_fd < 0) {
bb_error_msg("socket"); bb_error_msg_and_die("socket");
exit(2);
} }
if (device) { if (device) {
if (setsockopt if (setsockopt
@ -399,10 +393,9 @@ int arping_main(int argc, char **argv)
if (src.s_addr) { if (src.s_addr) {
saddr.sin_addr = src; saddr.sin_addr = src;
if (bind(probe_fd, (struct sockaddr *) &saddr, sizeof(saddr)) == -1) { if (bind(probe_fd, (struct sockaddr *) &saddr, sizeof(saddr)) == -1) {
bb_error_msg("bind"); bb_error_msg_and_die("bind");
exit(2);
} }
} else if (!dad) { } else if (!cfg.dad) {
int on = 1; int on = 1;
socklen_t alen = sizeof(saddr); socklen_t alen = sizeof(saddr);
@ -412,16 +405,14 @@ int arping_main(int argc, char **argv)
if (setsockopt if (setsockopt
(probe_fd, SOL_SOCKET, SO_DONTROUTE, (char *) &on, (probe_fd, SOL_SOCKET, SO_DONTROUTE, (char *) &on,
sizeof(on)) == -1) sizeof(on)) == -1)
perror("WARNING: setsockopt(SO_DONTROUTE)"); bb_perror_msg("WARNING: setsockopt(SO_DONTROUTE)");
if (connect(probe_fd, (struct sockaddr *) &saddr, sizeof(saddr)) if (connect(probe_fd, (struct sockaddr *) &saddr, sizeof(saddr))
== -1) { == -1) {
bb_error_msg("connect"); bb_error_msg_and_die("connect");
exit(2);
} }
if (getsockname(probe_fd, (struct sockaddr *) &saddr, &alen) == if (getsockname(probe_fd, (struct sockaddr *) &saddr, &alen) ==
-1) { -1) {
bb_error_msg("getsockname"); bb_error_msg_and_die("getsockname");
exit(2);
} }
src = saddr.sin_addr; src = saddr.sin_addr;
} }
@ -432,34 +423,31 @@ int arping_main(int argc, char **argv)
me.sll_ifindex = ifindex; me.sll_ifindex = ifindex;
me.sll_protocol = htons(ETH_P_ARP); me.sll_protocol = htons(ETH_P_ARP);
if (bind(s, (struct sockaddr *) &me, sizeof(me)) == -1) { if (bind(s, (struct sockaddr *) &me, sizeof(me)) == -1) {
bb_error_msg("bind"); bb_error_msg_and_die("bind");
exit(2);
} }
{ {
socklen_t alen = sizeof(me); socklen_t alen = sizeof(me);
if (getsockname(s, (struct sockaddr *) &me, &alen) == -1) { if (getsockname(s, (struct sockaddr *) &me, &alen) == -1) {
bb_error_msg("getsockname"); bb_error_msg_and_die("getsockname");
exit(2);
} }
} }
if (me.sll_halen == 0) { if (me.sll_halen == 0) {
bb_error_msg("Interface \"%s\" is not ARPable (no ll address)", device); bb_error_msg("Interface \"%s\" is not ARPable (no ll address)", device);
exit(dad ? 0 : 2); exit(cfg.dad ? 0 : 2);
} }
he = me; he = me;
memset(he.sll_addr, -1, he.sll_halen); memset(he.sll_addr, -1, he.sll_halen);
if (!quiet) { if (!cfg.quiet) {
printf("ARPING to %s", inet_ntoa(dst)); printf("ARPING to %s", inet_ntoa(dst));
printf(" from %s via %s\n", inet_ntoa(src), printf(" from %s via %s\n", inet_ntoa(src),
device ? device : "unknown"); device ? device : "unknown");
} }
if (!src.s_addr && !dad) { if (!src.s_addr && !cfg.dad) {
bb_error_msg("no src address in the non-DAD mode"); bb_error_msg_and_die("no src address in the non-DAD mode");
exit(2);
} }
{ {