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If physical link state changes to UP and a lease is bound, check to see if

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the currently assigned gateway/router still replies to ARP queries.  If so,
keep the lease.  If not, get a new lease.

Save the IP address of the current gateway/router.
Remove an outdated check for a buggy compiler.
Fix a typo in the previous commit that caused timeouts to be 1000x faster than
they should be.
This commit is contained in:
Nicholas J. Kain
2011-03-30 20:13:48 -04:00
parent de23d2241d
commit 03717e1593
8 changed files with 109 additions and 38 deletions
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31
ndhc/netlink.c
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@@ -25,6 +25,7 @@
#include "netlink.h"
#include "ifchange.h"
#include "arp.h"
#include "log.h"
#define NLMSG_RECVSIZE 8192
@@ -95,6 +96,18 @@ void nl_queryifstatus(int ifidx, struct client_state_t *cs)
send(cs->nlFd, &req, sizeof req, 0);
}
static void takedown_if(struct client_state_t *cs)
{
log_line("nl: taking down interface");
// Same as packet.c: line 258
ifchange(NULL, IFCHANGE_DECONFIG);
cs->dhcpState = DS_INIT_SELECTING;
cs->timeout = 0;
cs->requestedIP = 0;
cs->packetNum = 0;
change_listen_mode(cs, LM_RAW);
}
// Decode netlink messages and process them
static void nl_handlemsg(struct nlmsghdr *msg, unsigned int len,
struct client_state_t *cs)
@@ -130,24 +143,14 @@ static void nl_handlemsg(struct nlmsghdr *msg, unsigned int len,
* If we don't have a lease, state -> INIT.
*/
if (cs->dhcpState == DS_BOUND) {
/* arp_check_gw(cs); */
} else if (cs->dhcpState != DS_INIT_SELECTING) {
log_line("nl: taking down interface");
// Same as packet.c: line 258
ifchange(NULL, IFCHANGE_DECONFIG);
cs->dhcpState = DS_INIT_SELECTING;
cs->timeout = 0;
cs->requestedIP = 0;
cs->packetNum = 0;
change_listen_mode(cs, LM_RAW);
}
arp_gw_check(cs);
} else if (cs->dhcpState != DS_INIT_SELECTING)
takedown_if(cs);
}
} else {
if (cs->ifsPrevState != IFS_DOWN) {
cs->ifsPrevState = IFS_DOWN;
/*
* state -> DOWN
*/
takedown_if(cs);
}
}
} else {