iftop

ns_hash.c

@@ -0,0 +1,64 @@
+/* hash table */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include "ns_hash.h"
+#include "hash.h"
+
+#define hash_table_size 256
+
+int ns_hash_compare(void* a, void* b) {
+    struct in_addr* aa = (struct in_addr*)a;
+    struct in_addr* bb = (struct in_addr*)b;
+    return (aa->s_addr == bb->s_addr);
+}
+
+int ns_hash_hash(void* key) {
+    int hash;
+    long addr;
+        
+    addr = (long)((struct in_addr*)key)->s_addr;
+
+    hash = ((addr & 0x000000FF)
+            + (addr & 0x0000FF00 >> 8)
+            + (addr & 0x00FF0000 >> 16)
+            + (addr & 0xFF000000 >> 24)) % 0xFF;
+
+    return hash;
+}
+
+void* ns_hash_copy_key(void* orig) {
+    struct in_addr* copy = malloc(sizeof(struct in_addr));
+    if(copy == NULL) {
+        printf("Out of memory\n");
+        exit(1);
+    }
+    *copy = *(struct in_addr*)orig;
+    return copy;
+}
+
+void ns_hash_delete_key(void* key) {
+    free(key);
+}
+
+/*
+ * Allocate and return a hash
+ */
+hash_type* ns_hash_create() {
+    hash_type* hash_table;
+    if ((hash_table = calloc(hash_table_size, sizeof(hash_type*))) == 0) {
+        fprintf (stderr, "out of memory (hashTable)\n");
+        exit(1);
+    }
+    hash_table->size = hash_table_size;
+    hash_table->compare = &ns_hash_compare;
+    hash_table->hash = &ns_hash_hash;
+    hash_table->delete_key = &ns_hash_delete_key;
+    hash_table->copy_key = &ns_hash_copy_key;
+    hash_initialise(hash_table);
+    return hash_table;
+}
+