Wade Berrier writes:

Hello,

Here's a patch for a first attempt at static leases for udhcpd.
Included in the tarball are 2 files (static_leases.c, static_leases.h)
and a patch against the latest cvs.

In the config file you can configure static leases with the following
format:

static_lease 00:60:08:11:CE:4E 192.168.0.54
static_lease 00:60:08:11:CE:3E 192.168.0.44

Comments/suggestions/improvements are welcome.


Wade

networking/udhcp/static_leases.c

@@ -0,0 +1,119 @@
+/*
+ * static_leases.c -- Couple of functions to assist with storing and
+ * retrieving data for static leases
+ *
+ * Wade Berrier <wberrier@myrealbox.com> September 2004
+ *
+ */
+
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "static_leases.h"
+#include "dhcpd.h"
+
+/* Takes the address of the pointer to the static_leases linked list,
+ *   Address to a 6 byte mac address
+ *   Address to a 4 byte ip address */
+int addStaticLease(struct static_lease **lease_struct, uint8_t *mac, uint32_t *ip)
+{
+
+	struct static_lease *cur;
+	struct static_lease *new_static_lease;
+
+	/* Build new node */
+	new_static_lease = xmalloc(sizeof(struct static_lease));
+	new_static_lease->mac = mac;
+	new_static_lease->ip = ip;
+	new_static_lease->next = NULL;
+
+	/* If it's the first node to be added... */
+	if(*lease_struct == NULL)
+	{
+		*lease_struct = new_static_lease;
+	}
+	else
+	{
+		cur = *lease_struct;
+		while(cur->next != NULL)
+		{
+			cur = cur->next;
+		}
+
+		cur->next = new_static_lease;
+	}
+
+	return 1;
+
+}
+
+/* Check to see if a mac has an associated static lease */
+uint32_t getIpByMac(struct static_lease *lease_struct, void *arg)
+{
+	uint32_t return_ip;
+	struct static_lease *cur = lease_struct;
+	uint8_t *mac = arg;
+
+	return_ip = 0;
+
+	while(cur != NULL)
+	{
+		/* If the client has the correct mac  */
+		if(memcmp(cur->mac, mac, 6) == 0)
+		{
+			return_ip = *(cur->ip);
+		}
+
+		cur = cur->next;
+	}
+
+	return return_ip;
+
+}
+
+/* Check to see if an ip is reserved as a static ip */
+uint32_t reservedIp(struct static_lease *lease_struct, uint32_t ip)
+{
+	struct static_lease *cur = lease_struct;
+
+	uint32_t return_val = 0;
+
+	while(cur != NULL)
+	{
+		/* If the client has the correct ip  */
+		if(*cur->ip == ip)
+			return_val = 1;
+
+		cur = cur->next;
+	}
+
+	return return_val;
+
+}
+
+#ifdef UDHCP_DEBUG
+/* Print out static leases just to check what's going on */
+/* Takes the address of the pointer to the static_leases linked list */
+void printStaticLeases(struct static_lease **arg)
+{
+	/* Get a pointer to the linked list */
+	struct static_lease *cur = *arg;
+
+	while(cur != NULL)
+	{
+		/* printf("PrintStaticLeases: Lease mac Address: %x\n", cur->mac); */
+		printf("PrintStaticLeases: Lease mac Value: %x\n", *(cur->mac));
+		/* printf("PrintStaticLeases: Lease ip Address: %x\n", cur->ip); */
+		printf("PrintStaticLeases: Lease ip Value: %x\n", *(cur->ip));
+
+		cur = cur->next;
+	}
+
+
+}
+#endif
+
+
+