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-rw-r--r--networking/arping.c125
1 files changed, 55 insertions, 70 deletions
diff --git a/networking/arping.c b/networking/arping.c
index 1b26049..a022e70 100644
--- a/networking/arping.c
+++ b/networking/arping.c
@@ -8,9 +8,6 @@
* Busybox port: Nick Fedchik <nick@fedchik.org.ua>
*/
-//#include <sys/ioctl.h>
-//#include <signal.h>
-
#include <arpa/inet.h>
#include <net/if.h>
#include <netinet/ether.h>
@@ -18,42 +15,42 @@
#include "libbb.h"
+/* 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;
-
-enum cfg_e {
- dad = 1,
- unsolicited = 2,
- advert = 4,
- quiet = 8,
- quit_on_reply = 16,
- broadcast_only = 32,
- unicasting = 64
+static unsigned last;
+
+enum {
+ DAD = 1,
+ UNSOLICITED = 2,
+ ADVERT = 4,
+ QUIET = 8,
+ QUIT_ON_REPLY = 16,
+ BCAST_ONLY = 32,
+ UNICASTING = 64
};
static int cfg;
static int s;
static unsigned count = UINT_MAX;
-static unsigned timeout;
+static unsigned timeout_us;
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 )
-
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;
- RESERVE_CONFIG_UBUFFER(buf, 256);
+ unsigned now;
+ unsigned char buf[256];
struct arphdr *ah = (struct arphdr *) buf;
unsigned char *p = (unsigned char *) (ah + 1);
@@ -62,7 +59,7 @@ static int send_pack(int sock, struct in_addr *src_addr,
ah->ar_pro = htons(ETH_P_IP);
ah->ar_hln = ME->sll_halen;
ah->ar_pln = 4;
- ah->ar_op = cfg & 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);
p += ME->sll_halen;
@@ -70,7 +67,7 @@ static int send_pack(int sock, struct in_addr *src_addr,
memcpy(p, src_addr, 4);
p += 4;
- if (cfg & advert)
+ if (cfg & ADVERT)
memcpy(p, &ME->sll_addr, ah->ar_hln);
else
memcpy(p, &HE->sll_addr, ah->ar_hln);
@@ -79,21 +76,21 @@ static int send_pack(int sock, struct in_addr *src_addr,
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 (!(cfg & unicasting))
+ if (!(cfg & UNICASTING))
brd_sent++;
}
- RELEASE_CONFIG_BUFFER(buf);
return err;
}
+static void finish(void) ATTRIBUTE_NORETURN;
static void finish(void)
{
- if (!(cfg & quiet)) {
+ if (!(cfg & QUIET)) {
printf("Sent %d probe(s) (%d broadcast(s))\n"
"Received %d repl%s"
" (%d request(s), %d broadcast(s))\n",
@@ -101,30 +98,31 @@ static void finish(void)
received, (received == 1) ? "ies" : "y",
req_recv, brd_recv);
}
- if (cfg & dad)
+ if (cfg & DAD)
exit(!!received);
- if (cfg & unsolicited)
+ if (cfg & 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) {
+ count--;
+
+ if (last == 0 || (now - last) > 500000) {
send_pack(s, &src, &dst, &me, &he);
- if (count == 0 && (cfg & unsolicited))
+ if (count == 0 && (cfg & UNSOLICITED))
finish();
}
alarm(1);
@@ -162,7 +160,7 @@ static int recv_pack(unsigned char *buf, int len, struct sockaddr_ll *FROM)
return 0;
memcpy(&src_ip, p + ah->ar_hln, 4);
memcpy(&dst_ip, p + ah->ar_hln + 4 + ah->ar_hln, 4);
- if (!(cfg & dad)) {
+ if (!(cfg & DAD)) {
if (src_ip.s_addr != dst.s_addr)
return 0;
if (src.s_addr != dst_ip.s_addr)
@@ -190,11 +188,8 @@ static int recv_pack(unsigned char *buf, int len, struct sockaddr_ll *FROM)
if (src.s_addr && src.s_addr != dst_ip.s_addr)
return 0;
}
- if (!(cfg & quiet)) {
+ if (!(cfg & QUIET)) {
int s_printed = 0;
- struct timeval tv;
-
- gettimeofday(&tv, NULL);
printf("%scast re%s from %s [%s]",
FROM->sll_pkttype == PACKET_HOST ? "Uni" : "Broad",
@@ -212,13 +207,8 @@ static int recv_pack(unsigned char *buf, int len, struct sockaddr_ll *FROM)
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");
}
@@ -229,11 +219,11 @@ static int recv_pack(unsigned char *buf, int len, struct sockaddr_ll *FROM)
brd_recv++;
if (ah->ar_op == htons(ARPOP_REQUEST))
req_recv++;
- if (cfg & quit_on_reply)
+ if (cfg & QUIT_ON_REPLY)
finish();
- if (!(cfg & broadcast_only)) {
+ if (!(cfg & BCAST_ONLY)) {
memcpy(he.sll_addr, p, me.sll_halen);
- cfg |= unicasting;
+ cfg |= UNICASTING;
}
return 1;
}
@@ -245,6 +235,7 @@ int arping_main(int argc, char **argv)
int ifindex;
char *source = NULL;
char *target;
+ unsigned char *packet;
s = xsocket(PF_PACKET, SOCK_DGRAM, 0);
@@ -258,28 +249,23 @@ int arping_main(int argc, char **argv)
/* Dad also sets quit_on_reply.
* Advert also sets unsolicited.
*/
- opt_complementary = "Df:AU";
+ opt_complementary = "=1:Df:AU";
opt = getopt32(argc, argv, "DUAqfbc:w:I:s:",
&_count, &_timeout, &device, &source);
cfg |= opt & 0x3f; /* set respective flags */
if (opt & 0x40) /* -c: count */
count = xatou(_count);
if (opt & 0x80) /* -w: timeout */
- timeout = xatoul_range(_timeout, 0, INT_MAX/2000);
- //if (opt & 0x100) /* -i: interface */
- if (strlen(device) > IF_NAMESIZE) {
+ timeout_us = xatou_range(_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 */
}
- argc -= optind;
- argv += optind;
-
- if (argc != 1)
- bb_show_usage();
- target = *argv;
+ target = argv[optind];
xfunc_error_retval = 2;
@@ -301,7 +287,7 @@ int arping_main(int argc, char **argv)
}
if (ifr.ifr_flags & (IFF_NOARP | IFF_LOOPBACK)) {
bb_error_msg("interface %s is not ARPable", device);
- return (cfg & dad ? 0 : 2);
+ return (cfg & DAD ? 0 : 2);
}
}
@@ -317,10 +303,10 @@ int arping_main(int argc, char **argv)
bb_error_msg_and_die("invalid source address %s", source);
}
- if (!(cfg & dad) && (cfg & unsolicited) && src.s_addr == 0)
+ if (!(cfg & DAD) && (cfg & UNSOLICITED) && src.s_addr == 0)
src = dst;
- if (!(cfg & dad) || src.s_addr) {
+ if (!(cfg & DAD) || src.s_addr) {
struct sockaddr_in saddr;
int probe_fd = xsocket(AF_INET, SOCK_DGRAM, 0);
@@ -333,7 +319,7 @@ int arping_main(int argc, char **argv)
if (src.s_addr) {
saddr.sin_addr = src;
xbind(probe_fd, (struct sockaddr *) &saddr, sizeof(saddr));
- } else if (!(cfg & dad)) {
+ } else if (!(cfg & DAD)) {
socklen_t alen = sizeof(saddr);
saddr.sin_port = htons(1025);
@@ -364,18 +350,18 @@ int arping_main(int argc, char **argv)
}
if (me.sll_halen == 0) {
bb_error_msg("interface \"%s\" is not ARPable (no ll address)", device);
- return (cfg & dad ? 0 : 2);
+ return (cfg & DAD ? 0 : 2);
}
he = me;
memset(he.sll_addr, -1, he.sll_halen);
- if (!(cfg & quiet)) {
+ if (!(cfg & QUIET)) {
printf("ARPING to %s from %s via %s\n",
inet_ntoa(dst), inet_ntoa(src),
device ? device : "unknown");
}
- if (!src.s_addr && !(cfg & dad)) {
+ if (!src.s_addr && !(cfg & DAD)) {
bb_error_msg_and_die("no src address in the non-DAD mode");
}
@@ -394,9 +380,9 @@ int arping_main(int argc, char **argv)
catcher();
+ packet = xmalloc(4096);
while (1) {
sigset_t sset, osset;
- RESERVE_CONFIG_UBUFFER(packet, 4096);
struct sockaddr_ll from;
socklen_t alen = sizeof(from);
int cc;
@@ -412,6 +398,5 @@ int arping_main(int argc, char **argv)
sigprocmask(SIG_BLOCK, &sset, &osset);
recv_pack(packet, cc, &from);
sigprocmask(SIG_SETMASK, &osset, NULL);
- RELEASE_CONFIG_BUFFER(packet);
}
}
generated by cgit v1.1 at 2024-12-28 08:47:56 +0000