networking/udhcp/static_leases.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * static_leases.c -- Couple of functions to assist with storing and
   4  * retrieving data for static leases
   5  *
   6  * Wade Berrier <wberrier@myrealbox.com> September 2004
   7  *
   8  * Licensed under GPLv2, see file LICENSE in this tarball for details.
   9  */
  10
  11 #include "common.h"
  12 #include "dhcpd.h"
  13
  14
  15 /* Takes the address of the pointer to the static_leases linked list,
  16  *   Address to a 6 byte mac address
  17  *   Address to a 4 byte ip address */
  18 void FAST_FUNC addStaticLease(struct static_lease **lease_struct, uint8_t *mac, uint32_t ip)
  19 {
  20         struct static_lease *new_static_lease;
  21
  22         /* Build new node */
  23         new_static_lease = xzalloc(sizeof(struct static_lease));
  24         memcpy(new_static_lease->mac, mac, 6);
  25         new_static_lease->ip = ip;
  26         /*new_static_lease->next = NULL;*/
  27
  28         /* If it's the first node to be added... */
  29         if (*lease_struct == NULL) {
  30                 *lease_struct = new_static_lease;
  31         } else {
  32                 struct static_lease *cur = *lease_struct;
  33                 while (cur->next)
  34                         cur = cur->next;
  35                 cur->next = new_static_lease;
  36         }
  37 }
  38
  39 /* Check to see if a mac has an associated static lease */
  40 uint32_t FAST_FUNC getIpByMac(struct static_lease *lease_struct, void *mac)
  41 {
  42         while (lease_struct) {
  43                 if (memcmp(lease_struct->mac, mac, 6) == 0)
  44                         return lease_struct->ip;
  45                 lease_struct = lease_struct->next;
  46         }
  47
  48         return 0;
  49 }
  50
  51 /* Check to see if an ip is reserved as a static ip */
  52 int FAST_FUNC reservedIp(struct static_lease *lease_struct, uint32_t ip)
  53 {
  54         while (lease_struct) {
  55                 if (lease_struct->ip == ip)
  56                         return 1;
  57                 lease_struct = lease_struct->next;
  58         }
  59
  60         return 0;
  61 }
  62
  63 #if ENABLE_UDHCP_DEBUG
  64 /* Print out static leases just to check what's going on */
  65 /* Takes the address of the pointer to the static_leases linked list */
  66 void FAST_FUNC printStaticLeases(struct static_lease **arg)
  67 {
  68         struct static_lease *cur = *arg;
  69
  70         while (cur) {
  71                 printf("PrintStaticLeases: Lease mac Value: %02x:%02x:%02x:%02x:%02x:%02x\n",
  72                         cur->mac[0], cur->mac[1], cur->mac[2],
  73                         cur->mac[3], cur->mac[4], cur->mac[5]
  74                 );
  75                 printf("PrintStaticLeases: Lease ip Value: %x\n", cur->ip);
  76                 cur = cur->next;
  77         }
  78 }
  79 #endif