git.maemo.org Git - udhcp/blob - static_leases.c

   1 /*
   2  * static_leases.c -- Couple of functions to assist with storing and
   3  * retrieving data for static leases
   4  *
   5  * Wade Berrier <wberrier@myrealbox.com> September 2004
   6  *
   7  */
   8
   9
  10 #include <stdlib.h>
  11 #include <stdio.h>
  12 #include <string.h>
  13
  14 #include "static_leases.h"
  15 #include "dhcpd.h"
  16
  17 /* Takes the address of the pointer to the static_leases linked list,
  18  *   Address to a 6 byte mac address
  19  *   Address to a 4 byte ip address */
  20 int addStaticLease(struct static_lease **lease_struct, uint8_t *mac, uint32_t *ip)
  21 {
  22
  23         struct static_lease *cur;
  24         struct static_lease *new_static_lease;
  25
  26         /* Build new node */
  27         new_static_lease = xmalloc(sizeof(struct static_lease));
  28         new_static_lease->mac = mac;
  29         new_static_lease->ip = ip;
  30         new_static_lease->next = NULL;
  31
  32         /* If it's the first node to be added... */
  33         if(*lease_struct == NULL)
  34         {
  35                 *lease_struct = new_static_lease;
  36         }
  37         else
  38         {
  39                 cur = *lease_struct;
  40                 while(cur->next != NULL)
  41                 {
  42                         cur = cur->next;
  43                 }
  44
  45                 cur->next = new_static_lease;
  46         }
  47
  48         return 1;
  49
  50 }
  51
  52 /* Check to see if a mac has an associated static lease */
  53 uint32_t getIpByMac(struct static_lease *lease_struct, void *arg)
  54 {
  55         uint32_t return_ip;
  56         struct static_lease *cur = lease_struct;
  57         uint8_t *mac = arg;
  58
  59         return_ip = 0;
  60
  61         while(cur != NULL)
  62         {
  63                 /* If the client has the correct mac  */
  64                 if(memcmp(cur->mac, mac, 6) == 0)
  65                 {
  66                         return_ip = *(cur->ip);
  67                 }
  68
  69                 cur = cur->next;
  70         }
  71
  72         return return_ip;
  73
  74 }
  75
  76 /* Check to see if an ip is reserved as a static ip */
  77 uint32_t reservedIp(struct static_lease *lease_struct, uint32_t ip)
  78 {
  79         struct static_lease *cur = lease_struct;
  80
  81         uint32_t return_val = 0;
  82
  83         while(cur != NULL)
  84         {
  85                 /* If the client has the correct ip  */
  86                 if(*cur->ip == ip)
  87                         return_val = 1;
  88
  89                 cur = cur->next;
  90         }
  91
  92         return return_val;
  93
  94 }
  95
  96 #ifdef UDHCP_DEBUG
  97 /* Print out static leases just to check what's going on */
  98 /* Takes the address of the pointer to the static_leases linked list */
  99 void printStaticLeases(struct static_lease **arg)
 100 {
 101         /* Get a pointer to the linked list */
 102         struct static_lease *cur = *arg;
 103
 104         while(cur != NULL)
 105         {
 106                 /* printf("PrintStaticLeases: Lease mac Address: %x\n", cur->mac); */
 107                 printf("PrintStaticLeases: Lease mac Value: %x\n", *(cur->mac));
 108                 /* printf("PrintStaticLeases: Lease ip Address: %x\n", cur->ip); */
 109                 printf("PrintStaticLeases: Lease ip Value: %x\n", *(cur->ip));
 110
 111                 cur = cur->next;
 112         }
 113
 114
 115 }
 116 #endif
 117
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 119