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Async arp ping now works properly: arp_success() should be called on timeout

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Timeout delta now properly uses signed operators.
listenFd properly initialized to -1.
This commit is contained in:
Nicholas J. Kain 2010-12-23 11:34:57 -05:00
parent fa98b4c024
commit c45d116200
1 changed files with 15 additions and 8 deletions
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23
ndhc/ndhc.c
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@ -71,7 +71,7 @@ static uint32_t requested_ip, server_addr, timeout;
static uint32_t lease, t1, t2, xid;
static long long start;
static int dhcp_state, arp_prev_dhcp_state, packet_num, listenFd, listen_mode;
static int dhcp_state, arp_prev_dhcp_state, packet_num, listenFd = -1, listen_mode;
enum {
LISTEN_NONE,
@ -394,7 +394,8 @@ static void handle_timeout(void)
timeout = -1;
break;
case ARP_CHECK:
arp_failed();
/* No response to ARP obviously means that the address is free. */
arp_success();
break;
}
}
@ -419,15 +420,16 @@ static void handle_arp_response(void)
if (arpreply_offset >= ARP_MSG_SIZE) {
if (arpreply.operation == htons(ARPOP_REPLY)
/* don't check: Linux returns invalid tHaddr (fixed in 2.6.24?) */
/* && memcmp(arp.tHaddr, from_mac, 6) == 0 */
/* && memcmp(arpreply.tHaddr, from_mac, 6) == 0 */
&& *(aliased_uint32_t*)arpreply.sInaddr == arp_dhcp_packet.yiaddr)
{
/* if ARP source MAC matches safe_mac
* (which is client's MAC), then it's not a conflict
* (client simply already has this IP and replies to ARPs!)
*/
/* if (memcmp(safe_mac, arp.sHaddr, 6) == 0) */
arp_success();
/* if (memcmp(safe_mac, arpreply.sHaddr, 6) == 0) */
/* arp_success(); */
arp_failed();
} else {
memset(&arpreply, 0, sizeof arpreply);
arpreply_offset = 0;
@ -589,7 +591,7 @@ static void signal_dispatch()
static void do_work(void)
{
long long last_awake;
int timeout_delta;
int timeout_delta, stimeout;
epollfd = epoll_create1(0);
if (epollfd == -1)
@ -619,11 +621,14 @@ static void do_work(void)
suicide("epoll_wait: unknown fd");
}
stimeout = timeout;
timeout_delta = curms() - last_awake;
timeout -= timeout_delta;
if (timeout <= 0)
stimeout -= timeout_delta;
if (stimeout <= 0) {
timeout = 0;
handle_timeout();
}
}
}
int main(int argc, char **argv)
@ -671,9 +676,11 @@ int main(int argc, char **argv)
break;
case 'f':
client_config.foreground = 1;
gflags_detach = 0;
break;
case 'b':
client_config.background_if_no_lease = 1;
gflags_detach = 1;
break;
case 'p':
strlcpy(pidfile, optarg, sizeof pidfile);