git.maemo.org Git - busybox4maemo/blob - 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 #include "common.h"
  11 #include "dhcpd.h"
  12
  13
  14 /* Takes the address of the pointer to the static_leases linked list,
  15  *   Address to a 6 byte mac address
  16  *   Address to a 4 byte ip address */
  17 int addStaticLease(struct static_lease **lease_struct, uint8_t *mac, uint32_t *ip)
  18 {
  19         struct static_lease *cur;
  20         struct static_lease *new_static_lease;
  21
  22         /* Build new node */
  23         new_static_lease = xmalloc(sizeof(struct static_lease));
  24         new_static_lease->mac = mac;
  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                 cur = *lease_struct;
  33                 while (cur->next) {
  34                         cur = cur->next;
  35                 }
  36
  37                 cur->next = new_static_lease;
  38         }
  39
  40         return 1;
  41 }
  42
  43 /* Check to see if a mac has an associated static lease */
  44 uint32_t getIpByMac(struct static_lease *lease_struct, void *arg)
  45 {
  46         uint32_t return_ip;
  47         struct static_lease *cur = lease_struct;
  48         uint8_t *mac = arg;
  49
  50         return_ip = 0;
  51
  52         while (cur) {
  53                 /* If the client has the correct mac  */
  54                 if (memcmp(cur->mac, mac, 6) == 0) {
  55                         return_ip = *(cur->ip);
  56                 }
  57
  58                 cur = cur->next;
  59         }
  60
  61         return return_ip;
  62 }
  63
  64 /* Check to see if an ip is reserved as a static ip */
  65 uint32_t reservedIp(struct static_lease *lease_struct, uint32_t ip)
  66 {
  67         struct static_lease *cur = lease_struct;
  68
  69         uint32_t return_val = 0;
  70
  71         while (cur) {
  72                 /* If the client has the correct ip  */
  73                 if (*cur->ip == ip)
  74                         return_val = 1;
  75
  76                 cur = cur->next;
  77         }
  78
  79         return return_val;
  80 }
  81
  82 #if ENABLE_FEATURE_UDHCP_DEBUG
  83 /* Print out static leases just to check what's going on */
  84 /* Takes the address of the pointer to the static_leases linked list */
  85 void printStaticLeases(struct static_lease **arg)
  86 {
  87         /* Get a pointer to the linked list */
  88         struct static_lease *cur = *arg;
  89
  90         while (cur) {
  91                 /* printf("PrintStaticLeases: Lease mac Address: %x\n", cur->mac); */
  92                 printf("PrintStaticLeases: Lease mac Value: %x\n", *(cur->mac));
  93                 /* printf("PrintStaticLeases: Lease ip Address: %x\n", cur->ip); */
  94                 printf("PrintStaticLeases: Lease ip Value: %x\n", *(cur->ip));
  95
  96                 cur = cur->next;
  97         }
  98 }
  99 #endif