-/*
- * leases.c -- tools to manage DHCP leases
+/* vi: set sw=4 ts=4: */
+/*
+ * leases.c -- tools to manage DHCP leases
* Russ Dill <Russ.Dill@asu.edu> July 2001
*/
-#include <time.h>
-#include <string.h>
-#include <sys/socket.h>
-#include <netinet/in.h>
-#include <arpa/inet.h>
-
-#include "debug.h"
+#include "common.h"
#include "dhcpd.h"
-#include "files.h"
-#include "options.h"
-#include "leases.h"
-#include "arpping.h"
-unsigned char blank_chaddr[] = {[0 ... 15] = 0};
+
+uint8_t blank_chaddr[] = {[0 ... 15] = 0};
/* clear every lease out that chaddr OR yiaddr matches and is nonzero */
-void clear_lease(u_int8_t *chaddr, u_int32_t yiaddr)
+void clear_lease(uint8_t *chaddr, uint32_t yiaddr)
{
unsigned int i, j;
-
+
for (j = 0; j < 16 && !chaddr[j]; j++);
-
+
for (i = 0; i < server_config.max_leases; i++)
if ((j != 16 && !memcmp(leases[i].chaddr, chaddr, 16)) ||
(yiaddr && leases[i].yiaddr == yiaddr)) {
/* add a lease into the table, clearing out any old ones */
-struct dhcpOfferedAddr *add_lease(u_int8_t *chaddr, u_int32_t yiaddr, unsigned long lease)
+struct dhcpOfferedAddr *add_lease(uint8_t *chaddr, uint32_t yiaddr, unsigned long lease)
{
struct dhcpOfferedAddr *oldest;
-
+
/* clean out any old ones */
clear_lease(chaddr, yiaddr);
-
+
oldest = oldest_expired_lease();
-
+
if (oldest) {
memcpy(oldest->chaddr, chaddr, 16);
oldest->yiaddr = yiaddr;
oldest->expires = time(0) + lease;
}
-
+
return oldest;
}
int lease_expired(struct dhcpOfferedAddr *lease)
{
return (lease->expires < (unsigned long) time(0));
-}
+}
/* Find the oldest expired lease, NULL if there are no expired leases */
unsigned long oldest_lease = time(0);
unsigned int i;
-
+
for (i = 0; i < server_config.max_leases; i++)
if (oldest_lease > leases[i].expires) {
oldest_lease = leases[i].expires;
oldest = &(leases[i]);
}
return oldest;
-
+
}
/* Find the first lease that matches chaddr, NULL if no match */
-struct dhcpOfferedAddr *find_lease_by_chaddr(u_int8_t *chaddr)
+struct dhcpOfferedAddr *find_lease_by_chaddr(uint8_t *chaddr)
{
unsigned int i;
for (i = 0; i < server_config.max_leases; i++)
if (!memcmp(leases[i].chaddr, chaddr, 16)) return &(leases[i]);
-
+
return NULL;
}
/* Find the first lease that matches yiaddr, NULL is no match */
-struct dhcpOfferedAddr *find_lease_by_yiaddr(u_int32_t yiaddr)
+struct dhcpOfferedAddr *find_lease_by_yiaddr(uint32_t yiaddr)
{
unsigned int i;
for (i = 0; i < server_config.max_leases; i++)
if (leases[i].yiaddr == yiaddr) return &(leases[i]);
-
+
return NULL;
}
+/* check is an IP is taken, if it is, add it to the lease table */
+static int check_ip(uint32_t addr)
+{
+ struct in_addr temp;
+
+ if (arpping(addr, server_config.server, server_config.arp, server_config.interface) == 0) {
+ temp.s_addr = addr;
+ bb_info_msg("%s belongs to someone, reserving it for %ld seconds",
+ inet_ntoa(temp), server_config.conflict_time);
+ add_lease(blank_chaddr, addr, server_config.conflict_time);
+ return 1;
+ } else return 0;
+}
+
+
/* find an assignable address, it check_expired is true, we check all the expired leases as well.
* Maybe this should try expired leases by age... */
-u_int32_t find_address(int check_expired)
+uint32_t find_address(int check_expired)
{
- u_int32_t addr, ret;
- struct dhcpOfferedAddr *lease = NULL;
+ uint32_t addr, ret;
+ struct dhcpOfferedAddr *lease = NULL;
addr = ntohl(server_config.start); /* addr is in host order here */
for (;addr <= ntohl(server_config.end); addr++) {
/* ie, 192.168.55.255 */
if ((addr & 0xFF) == 0xFF) continue;
- /* lease is not taken */
- ret = htonl(addr);
- if ((!(lease = find_lease_by_yiaddr(ret)) ||
+ /* Only do if it isn't an assigned as a static lease */
+ if (!reservedIp(server_config.static_leases, htonl(addr))) {
- /* or it expired and we are checking for expired leases */
- (check_expired && lease_expired(lease))) &&
+ /* lease is not taken */
+ ret = htonl(addr);
+ lease = find_lease_by_yiaddr(ret);
- /* and it isn't on the network */
- !check_ip(ret)) {
- return ret;
- break;
+ /* no lease or it expired and we are checking for expired leases */
+ if ( (!lease || (check_expired && lease_expired(lease)))
+ && /* and it isn't on the network */ !check_ip(ret)
+ ) {
+ return ret;
+ break;
+ }
}
}
return 0;
}
-
-
-/* check is an IP is taken, if it is, add it to the lease table */
-int check_ip(u_int32_t addr)
-{
- struct in_addr temp;
-
- if (arpping(addr, server_config.server, server_config.arp, server_config.interface) == 0) {
- temp.s_addr = addr;
- LOG(LOG_INFO, "%s belongs to someone, reserving it for %ld seconds",
- inet_ntoa(temp), server_config.conflict_time);
- add_lease(blank_chaddr, addr, server_config.conflict_time);
- return 1;
- } else return 0;
-}
-
projects / oweals / busybox.git / blobdiff