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authorDenis Vlasenko2009-01-01 17:52:09 +0000
committerDenis Vlasenko2009-01-01 17:52:09 +0000
commit0416e3dde17ea9295635c52183b30fe3d7172333 (patch)
tree4eea1c401c74d6ec42f18c67090f73001103e0db /networking/udhcp/leases.c
parentb2ec03813c34bc3de2ddf9a0974be4e5b31ec757 (diff)
downloadbusybox-0416e3dde17ea9295635c52183b30fe3d7172333.zip
busybox-0416e3dde17ea9295635c52183b30fe3d7172333.tar.gz
udhcpd: disable opton to have absolute lease times in lease file
(that does not work with dumpleases) dumpleases: fix -a option. networking/udhcp/*: code shrink, more compact static leases struture, better comments, etc function old new delta find_free_or_expired_address - 147 +147 nobody_responds_to_arp - 84 +84 read_opt 781 830 +49 dumpleases_main 435 447 +12 send_ACK 229 232 +3 read_staticlease 90 93 +3 addStaticLease 60 61 +1 getIpByMac 46 43 -3 reservedIp 31 20 -11 keywords 304 288 -16 send_offer 428 403 -25 write_leases 225 193 -32 read_leases 184 143 -41 read_yn 64 - -64 find_address 191 - -191 ------------------------------------------------------------------------------ (add/remove: 2/2 grow/shrink: 5/6 up/down: 299/-383) Total: -84 bytes
Diffstat (limited to 'networking/udhcp/leases.c')
-rw-r--r--networking/udhcp/leases.c79
1 files changed, 46 insertions, 33 deletions
diff --git a/networking/udhcp/leases.c b/networking/udhcp/leases.c
index a981db0..3044c20 100644
--- a/networking/udhcp/leases.c
+++ b/networking/udhcp/leases.c
@@ -13,21 +13,23 @@
/* Find the oldest expired lease, NULL if there are no expired leases */
static struct dhcpOfferedAddr *oldest_expired_lease(void)
{
- struct dhcpOfferedAddr *oldest = NULL;
-// TODO: use monotonic_sec()
- unsigned long oldest_lease = time(0);
+ struct dhcpOfferedAddr *oldest_lease = NULL;
+ leasetime_t oldest_time = time(NULL);
unsigned i;
- for (i = 0; i < server_config.max_leases; i++)
- if (oldest_lease > leases[i].expires) {
- oldest_lease = leases[i].expires;
- oldest = &(leases[i]);
+ /* Unexpired leases have leases[i].expires >= current time
+ * and therefore can't ever match */
+ for (i = 0; i < server_config.max_leases; i++) {
+ if (leases[i].expires < oldest_time) {
+ oldest_time = leases[i].expires;
+ oldest_lease = &(leases[i]);
}
- return oldest;
+ }
+ return oldest_lease;
}
-/* clear every lease out that chaddr OR yiaddr matches and is nonzero */
+/* Clear every lease out that chaddr OR yiaddr matches and is nonzero */
static void clear_lease(const uint8_t *chaddr, uint32_t yiaddr)
{
unsigned i, j;
@@ -35,17 +37,18 @@ static void clear_lease(const uint8_t *chaddr, uint32_t yiaddr)
for (j = 0; j < 16 && !chaddr[j]; j++)
continue;
- for (i = 0; i < server_config.max_leases; i++)
+ for (i = 0; i < server_config.max_leases; i++) {
if ((j != 16 && memcmp(leases[i].chaddr, chaddr, 16) == 0)
|| (yiaddr && leases[i].yiaddr == yiaddr)
) {
memset(&(leases[i]), 0, sizeof(leases[i]));
}
+ }
}
-/* add a lease into the table, clearing out any old ones */
-struct dhcpOfferedAddr* FAST_FUNC add_lease(const uint8_t *chaddr, uint32_t yiaddr, unsigned long lease)
+/* Add a lease into the table, clearing out any old ones */
+struct dhcpOfferedAddr* FAST_FUNC add_lease(const uint8_t *chaddr, uint32_t yiaddr, leasetime_t leasetime)
{
struct dhcpOfferedAddr *oldest;
@@ -57,17 +60,17 @@ struct dhcpOfferedAddr* FAST_FUNC add_lease(const uint8_t *chaddr, uint32_t yiad
if (oldest) {
memcpy(oldest->chaddr, chaddr, 16);
oldest->yiaddr = yiaddr;
- oldest->expires = time(0) + lease;
+ oldest->expires = time(NULL) + leasetime;
}
return oldest;
}
-/* true if a lease has expired */
+/* True if a lease has expired */
int FAST_FUNC lease_expired(struct dhcpOfferedAddr *lease)
{
- return (lease->expires < (unsigned long) time(0));
+ return (lease->expires < (leasetime_t) time(NULL));
}
@@ -119,33 +122,43 @@ static int nobody_responds_to_arp(uint32_t addr)
}
-/* find an assignable address, if check_expired is true, we check all the expired leases as well.
- * Maybe this should try expired leases by age... */
-uint32_t FAST_FUNC find_address(int check_expired)
+/* Find a new usable (we think) address. */
+uint32_t FAST_FUNC find_free_or_expired_address(void)
{
- uint32_t addr, ret;
- struct dhcpOfferedAddr *lease = NULL;
+ uint32_t addr;
+ struct dhcpOfferedAddr *oldest_lease = NULL;
addr = server_config.start_ip; /* addr is in host order here */
for (; addr <= server_config.end_ip; addr++) {
+ uint32_t net_addr;
+ struct dhcpOfferedAddr *lease;
+
/* ie, 192.168.55.0 */
- if (!(addr & 0xFF))
+ if ((addr & 0xff) == 0)
continue;
/* ie, 192.168.55.255 */
- if ((addr & 0xFF) == 0xFF)
+ if ((addr & 0xff) == 0xff)
continue;
- /* Only do if it isn't assigned as a static lease */
- ret = htonl(addr);
- if (!reservedIp(server_config.static_leases, ret)) {
- /* lease is not taken */
- lease = find_lease_by_yiaddr(ret);
- /* no lease or it expired and we are checking for expired leases */
- if ((!lease || (check_expired && lease_expired(lease)))
- && nobody_responds_to_arp(ret) /* it isn't used on the network */
- ) {
- return ret;
- }
+ net_addr = htonl(addr);
+ /* addr has a static lease? */
+ if (reservedIp(server_config.static_leases, net_addr))
+ continue;
+
+ lease = find_lease_by_yiaddr(net_addr);
+ if (!lease) {
+ if (nobody_responds_to_arp(net_addr))
+ return net_addr;
+ } else {
+ if (!oldest_lease || lease->expires < oldest_lease->expires)
+ oldest_lease = lease;
}
}
+
+ if (oldest_lease && lease_expired(oldest_lease)
+ && nobody_responds_to_arp(oldest_lease->yiaddr)
+ ) {
+ return oldest_lease->yiaddr;
+ }
+
return 0;
}