/* hash table */
#include <stdio.h>
#include <stdlib.h>
#include "addr_hash.h"
#include "hash.h"
#include "iftop.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->src_port == bb->src_port
&& aa->dst.s_addr == bb->dst.s_addr
&& aa->dst_port == bb->dst_port
&& aa->protocol == bb->protocol);
}
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)
+ ap->src_port) % 0xFF;
addr = (long)ap->dst.s_addr;
hash = ( hash + (addr & 0x000000FF)
+ (addr & 0x0000FF00 >> 8)
+ (addr & 0x00FF0000 >> 16)
+ (addr & 0xFF000000 >> 24)
+ ap->dst_port) % 0xFF;
return hash;
}
void* copy_key(void* orig) {
addr_pair* copy;
copy = xmalloc(sizeof *copy);
*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;
hash_table = xcalloc(hash_table_size, sizeof *hash_table);
hash_table->size = hash_table_size;
hash_table->compare = &compare;
hash_table->hash = &hash;
hash_table->delete_key = &delete_key;
hash_table->copy_key = ©_key;
hash_initialise(hash_table);
return hash_table;
}
FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>