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arping: code shrink

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Do not clear extra bits on option_mask32, it's not necessary.
Move DAD bit to 2, this makes exit logic simpler.

function                                             old     new   delta
arping_main                                         1655    1629     -26

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2018-02-11 13:27:54 +01:00
parent 3f52d13647
commit f5d50fbd2f
1 changed files with 28 additions and 28 deletions
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56
networking/arping.c
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@ -11,7 +11,6 @@
//config: select PLATFORM_LINUX
//config: help
//config: Ping hosts by ARP packets.
//config:
//applet:IF_ARPING(APPLET(arping, BB_DIR_USR_SBIN, BB_SUID_DROP))
@ -45,14 +44,23 @@
#define MONOTONIC_US() ((unsigned)monotonic_us())
enum {
DAD = 1,
UNSOLICITED = 2,
ADVERT = 4,
QUIET = 8,
QUIT_ON_REPLY = 16,
BCAST_ONLY = 32,
UNICASTING = 64
UNSOLICITED = 1 << 0,
DAD = 1 << 1,
ADVERT = 1 << 2,
QUIET = 1 << 3,
QUIT_ON_REPLY = 1 << 4,
BCAST_ONLY = 1 << 5,
UNICASTING = 1 << 6,
TIMEOUT = 1 << 7,
};
#define GETOPT32(str_timeout, device, source) \
getopt32(argv, "^" \
"UDAqfbc:+w:I:s:" \
/* Dad also sets quit_on_reply, */ \
/* Advert also sets unsolicited: */ \
"\0" "=1:Df:AU", \
&count, &str_timeout, &device, &source \
);
struct globals {
struct in_addr src;
@ -92,21 +100,15 @@ struct globals {
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 in_addr *dst_addr,
struct sockaddr_ll *ME,
struct sockaddr_ll *HE)
{
int err;
unsigned char buf[256];
struct arphdr *ah = (struct arphdr *) buf;
unsigned char *p = (unsigned char *) (ah + 1);
unsigned char *p;
ah->ar_hrd = htons(ARPHRD_ETHER);
ah->ar_pro = htons(ETH_P_IP);
@ -114,6 +116,7 @@ static int send_pack(struct in_addr *src_addr,
ah->ar_pln = 4;
ah->ar_op = option_mask32 & ADVERT ? htons(ARPOP_REPLY) : htons(ARPOP_REQUEST);
p = (unsigned char *) (ah + 1);
p = mempcpy(p, &ME->sll_addr, ah->ar_hln);
p = mempcpy(p, src_addr, 4);
@ -303,16 +306,9 @@ int arping_main(int argc UNUSED_PARAM, char **argv)
unsigned opt;
char *str_timeout;
/* Dad also sets quit_on_reply.
* Advert also sets unsolicited.
*/
opt = getopt32(argv, "^" "DUAqfbc:+w:I:s:" "\0" "=1:Df:AU",
&count, &str_timeout, &device, &source
);
if (opt & 0x80) /* -w: timeout */
opt = GETOPT32(str_timeout, device, source);
if (opt & TIMEOUT)
timeout_us = xatou_range(str_timeout, 0, INT_MAX/2000000) * 1000000 + 500000;
//if (opt & 0x200) /* -s: source */
option_mask32 &= 0x3f; /* set respective flags */
}
target = argv[optind];
@ -336,7 +332,9 @@ int arping_main(int argc UNUSED_PARAM, char **argv)
}
if (ifr.ifr_flags & (IFF_NOARP | IFF_LOOPBACK)) {
bb_error_msg(err_str, "is not ARPable");
return (option_mask32 & DAD ? 0 : 2);
BUILD_BUG_ON(DAD != 2);
/* exit 0 if DAD, else exit 2 */
return (~option_mask32 & DAD);
}
}
@ -401,7 +399,9 @@ int arping_main(int argc UNUSED_PARAM, char **argv)
}
if (me.sll_halen == 0) {
bb_error_msg(err_str, "is not ARPable (no ll address)");
return (option_mask32 & DAD ? 0 : 2);
BUILD_BUG_ON(DAD != 2);
/* exit 0 if DAD, else exit 2 */
return (~option_mask32 & DAD);
}
he = me;
memset(he.sll_addr, -1, he.sll_halen);