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Diffstat (limited to 'networking/arping.c')
-rw-r--r--networking/arping.c83
1 files changed, 41 insertions, 42 deletions
diff --git a/networking/arping.c b/networking/arping.c
index a022e70..7a9fbc2 100644
--- a/networking/arping.c
+++ b/networking/arping.c
@@ -33,18 +33,17 @@ enum {
BCAST_ONLY = 32,
UNICASTING = 64
};
-static int cfg;
-static int s;
+static int sock;
static unsigned count = UINT_MAX;
static unsigned timeout_us;
-static int sent;
-static int brd_sent;
-static int received;
-static int brd_recv;
-static int req_recv;
+static unsigned sent;
+static unsigned brd_sent;
+static unsigned received;
+static unsigned brd_recv;
+static unsigned req_recv;
-static int send_pack(int sock, struct in_addr *src_addr,
+static int send_pack(struct in_addr *src_addr,
struct in_addr *dst_addr, struct sockaddr_ll *ME,
struct sockaddr_ll *HE)
{
@@ -59,7 +58,7 @@ 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 = option_mask32 & ADVERT ? htons(ARPOP_REPLY) : htons(ARPOP_REQUEST);
memcpy(p, &ME->sll_addr, ah->ar_hln);
p += ME->sll_halen;
@@ -67,7 +66,7 @@ static int send_pack(int sock, struct in_addr *src_addr,
memcpy(p, src_addr, 4);
p += 4;
- if (cfg & ADVERT)
+ if (option_mask32 & ADVERT)
memcpy(p, &ME->sll_addr, ah->ar_hln);
else
memcpy(p, &HE->sll_addr, ah->ar_hln);
@@ -81,7 +80,7 @@ static int send_pack(int sock, struct in_addr *src_addr,
if (err == p - buf) {
last = now;
sent++;
- if (!(cfg & UNICASTING))
+ if (!(option_mask32 & UNICASTING))
brd_sent++;
}
return err;
@@ -90,17 +89,17 @@ static int send_pack(int sock, struct in_addr *src_addr,
static void finish(void) ATTRIBUTE_NORETURN;
static void finish(void)
{
- if (!(cfg & QUIET)) {
- printf("Sent %d probe(s) (%d broadcast(s))\n"
- "Received %d repl%s"
- " (%d request(s), %d broadcast(s))\n",
+ 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 (cfg & DAD)
+ if (option_mask32 & DAD)
exit(!!received);
- if (cfg & UNSOLICITED)
+ if (option_mask32 & UNSOLICITED)
exit(0);
exit(!received);
}
@@ -121,8 +120,8 @@ static void catcher(void)
count--;
if (last == 0 || (now - last) > 500000) {
- send_pack(s, &src, &dst, &me, &he);
- if (count == 0 && (cfg & UNSOLICITED))
+ send_pack(&src, &dst, &me, &he);
+ if (count == 0 && (option_mask32 & UNSOLICITED))
finish();
}
alarm(1);
@@ -160,7 +159,7 @@ 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 (!(option_mask32 & DAD)) {
if (src_ip.s_addr != dst.s_addr)
return 0;
if (src.s_addr != dst_ip.s_addr)
@@ -188,7 +187,7 @@ 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 (!(option_mask32 & QUIET)) {
int s_printed = 0;
printf("%scast re%s from %s [%s]",
@@ -219,11 +218,11 @@ 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 (option_mask32 & QUIT_ON_REPLY)
finish();
- if (!(cfg & BCAST_ONLY)) {
+ if (!(option_mask32 & BCAST_ONLY)) {
memcpy(he.sll_addr, p, me.sll_halen);
- cfg |= UNICASTING;
+ option_mask32 |= UNICASTING;
}
return 1;
}
@@ -237,32 +236,32 @@ int arping_main(int argc, char **argv)
char *target;
unsigned char *packet;
- s = xsocket(PF_PACKET, SOCK_DGRAM, 0);
+ sock = xsocket(PF_PACKET, SOCK_DGRAM, 0);
// Drop suid root privileges
xsetuid(getuid());
{
unsigned opt;
- char *_count, *_timeout;
+ char *str_count, *str_timeout;
/* Dad also sets quit_on_reply.
* Advert also sets unsolicited.
*/
opt_complementary = "=1:Df:AU";
opt = getopt32(argc, argv, "DUAqfbc:w:I:s:",
- &_count, &_timeout, &device, &source);
- cfg |= opt & 0x3f; /* set respective flags */
+ &str_count, &str_timeout, &device, &source);
if (opt & 0x40) /* -c: count */
- count = xatou(_count);
+ count = xatou(str_count);
if (opt & 0x80) /* -w: timeout */
- timeout_us = xatou_range(_timeout, 0, INT_MAX/2000000) * 1000000;
+ 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];
@@ -274,12 +273,12 @@ int arping_main(int argc, char **argv)
memset(&ifr, 0, sizeof(ifr));
strncpy(ifr.ifr_name, device, IFNAMSIZ - 1);
- if (ioctl(s, SIOCGIFINDEX, &ifr) < 0) {
+ if (ioctl(sock, SIOCGIFINDEX, &ifr) < 0) {
bb_error_msg_and_die("interface %s not found", device);
}
ifindex = ifr.ifr_ifindex;
- if (ioctl(s, SIOCGIFFLAGS, (char *) &ifr)) {
+ if (ioctl(sock, SIOCGIFFLAGS, (char *) &ifr)) {
bb_error_msg_and_die("SIOCGIFFLAGS");
}
if (!(ifr.ifr_flags & IFF_UP)) {
@@ -287,7 +286,7 @@ 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 (option_mask32 & DAD ? 0 : 2);
}
}
@@ -303,10 +302,10 @@ 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 (!(option_mask32 & DAD) && (option_mask32 & UNSOLICITED) && src.s_addr == 0)
src = dst;
- if (!(cfg & DAD) || src.s_addr) {
+ if (!(option_mask32 & DAD) || src.s_addr) {
struct sockaddr_in saddr;
int probe_fd = xsocket(AF_INET, SOCK_DGRAM, 0);
@@ -319,7 +318,7 @@ 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 (!(option_mask32 & DAD)) {
socklen_t alen = sizeof(saddr);
saddr.sin_port = htons(1025);
@@ -339,29 +338,29 @@ int arping_main(int argc, char **argv)
me.sll_family = AF_PACKET;
me.sll_ifindex = ifindex;
me.sll_protocol = htons(ETH_P_ARP);
- xbind(s, (struct sockaddr *) &me, sizeof(me));
+ xbind(sock, (struct sockaddr *) &me, sizeof(me));
{
socklen_t alen = sizeof(me);
- if (getsockname(s, (struct sockaddr *) &me, &alen) == -1) {
+ 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);
- return (cfg & DAD ? 0 : 2);
+ return (option_mask32 & DAD ? 0 : 2);
}
he = me;
memset(he.sll_addr, -1, he.sll_halen);
- if (!(cfg & QUIET)) {
+ 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 && !(cfg & DAD)) {
+ if (!src.s_addr && !(option_mask32 & DAD)) {
bb_error_msg_and_die("no src address in the non-DAD mode");
}
@@ -387,7 +386,7 @@ int arping_main(int argc, char **argv)
socklen_t alen = sizeof(from);
int cc;
- cc = recvfrom(s, packet, 4096, 0, (struct sockaddr *) &from, &alen);
+ cc = recvfrom(sock, packet, 4096, 0, (struct sockaddr *) &from, &alen);
if (cc < 0) {
bb_perror_msg("recvfrom");
continue;
generated by cgit v1.1 at 2024-12-26 15:08:01 +0000