iftop

1 files changed, 69 insertions, 0 deletions

diff --git a/addr_hash.c b/addr_hash.c
new file mode 100644
index 0000000..2040083
--- /dev/null
+++ b/addr_hash.c
@@ -0,0 +1,69 @@
+/* hash table */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include "addr_hash.h"
+#include "hash.h"
+
+#define hash_table_size 256
+
+int compare(void* a, void* b) {
+    addr_pair* aa = (addr_pair*)a;
+    addr_pair* bb = (addr_pair*)b;
+    return (aa->src.s_addr == bb->src.s_addr 
+            && aa->dst.s_addr == bb->dst.s_addr);
+}
+
+int hash(void* key) {
+    int hash;
+    long addr;
+    addr_pair* ap = (addr_pair*)key;
+        
+    addr = (long)ap->src.s_addr;
+
+    hash = ((addr & 0x000000FF)
+            + (addr & 0x0000FF00 >> 8)
+            + (addr & 0x00FF0000 >> 16)
+            + (addr & 0xFF000000 >> 24)) % 0xFF;
+
+    addr = (long)ap->dst.s_addr;
+    hash += ((addr & 0x000000FF)
+            + (addr & 0x0000FF00 >> 8)
+            + (addr & 0x00FF0000 >> 16)
+            + (addr & 0xFF000000 >> 24)) % 0xFF;
+
+    return hash;
+}
+
+void* copy_key(void* orig) {
+    addr_pair* copy = malloc(sizeof(addr_pair));
+    if(copy == NULL) {
+        printf("Out of memory\n");
+        exit(1);
+    }
+    *copy = *(addr_pair*)orig;
+    return copy;
+}
+
+void delete_key(void* key) {
+    free(key);
+}
+
+/*
+ * Allocate and return a hash
+ */
+hash_type* addr_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 = &compare;
+    hash_table->hash = &hash;
+    hash_table->delete_key = &delete_key;
+    hash_table->copy_key = &copy_key;
+    hash_initialise(hash_table);
+    return hash_table;
+}
+