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  */
   9
  10
  11 #include <stdlib.h>
  12 #include <stdio.h>
  13 #include <string.h>
  14
  15 #include "static_leases.h"
  16 #include "dhcpd.h"
  17
  18 /* Takes the address of the pointer to the static_leases linked list,
  19  *   Address to a 6 byte mac address
  20  *   Address to a 4 byte ip address */
  21 int addStaticLease(struct static_lease **lease_struct, uint8_t *mac, uint32_t *ip)
  22 {
  23
  24         struct static_lease *cur;
  25         struct static_lease *new_static_lease;
  26
  27         /* Build new node */
  28         new_static_lease = xmalloc(sizeof(struct static_lease));
  29         new_static_lease->mac = mac;
  30         new_static_lease->ip = ip;
  31         new_static_lease->next = NULL;
  32
  33         /* If it's the first node to be added... */
  34         if(*lease_struct == NULL)
  35         {
  36                 *lease_struct = new_static_lease;
  37         }
  38         else
  39         {
  40                 cur = *lease_struct;
  41                 while(cur->next != NULL)
  42                 {
  43                         cur = cur->next;
  44                 }
  45
  46                 cur->next = new_static_lease;
  47         }
  48
  49         return 1;
  50
  51 }
  52
  53 /* Check to see if a mac has an associated static lease */
  54 uint32_t getIpByMac(struct static_lease *lease_struct, void *arg)
  55 {
  56         uint32_t return_ip;
  57         struct static_lease *cur = lease_struct;
  58         uint8_t *mac = arg;
  59
  60         return_ip = 0;
  61
  62         while(cur != NULL)
  63         {
  64                 /* If the client has the correct mac  */
  65                 if(memcmp(cur->mac, mac, 6) == 0)
  66                 {
  67                         return_ip = *(cur->ip);
  68                 }
  69
  70                 cur = cur->next;
  71         }
  72
  73         return return_ip;
  74
  75 }
  76
  77 /* Check to see if an ip is reserved as a static ip */
  78 uint32_t reservedIp(struct static_lease *lease_struct, uint32_t ip)
  79 {
  80         struct static_lease *cur = lease_struct;
  81
  82         uint32_t return_val = 0;
  83
  84         while(cur != NULL)
  85         {
  86                 /* If the client has the correct ip  */
  87                 if(*cur->ip == ip)
  88                         return_val = 1;
  89
  90                 cur = cur->next;
  91         }
  92
  93         return return_val;
  94
  95 }
  96
  97 #ifdef CONFIG_FEATURE_UDHCP_DEBUG
  98 /* Print out static leases just to check what's going on */
  99 /* Takes the address of the pointer to the static_leases linked list */
 100 void printStaticLeases(struct static_lease **arg)
 101 {
 102         /* Get a pointer to the linked list */
 103         struct static_lease *cur = *arg;
 104
 105         while(cur != NULL)
 106         {
 107                 /* printf("PrintStaticLeases: Lease mac Address: %x\n", cur->mac); */
 108                 printf("PrintStaticLeases: Lease mac Value: %x\n", *(cur->mac));
 109                 /* printf("PrintStaticLeases: Lease ip Address: %x\n", cur->ip); */
 110                 printf("PrintStaticLeases: Lease ip Value: %x\n", *(cur->ip));
 111
 112                 cur = cur->next;
 113         }
 114
 115
 116 }
 117 #endif
 118
 119
 120