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saved_parameters.c
executable file
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saved_parameters.c
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#include "syscalls.h"
#include "hashtable.h"
#include <stdlib.h>
#include <xen/hvm/ether.h>
#include <memory.h>
#include <stdio.h>
struct hashtable *sp_table;
struct saved_parameters *sp_list_head;
struct hashtable *sp_init(void)
{
struct hashtable *table = NULL;
table = create_hashtable(SP_TABLE_ENTRIES,
sp_hash_fn,
sp_equality_fn);
sp_table = table;
sp_list_head = NULL;
return sp_table;
}
void sp_cleanup(void)
{
struct saved_parameters *p = sp_list_head, *nextp;
hashtable_destroy(sp_table, 0);
while(p != NULL)
{
if(p->parameters != NULL)
free(p->parameters);
p->parameters = NULL;
nextp = p->next;
free(p);
p = nextp;
}
}
int sp_save_parameters(uint32_t *parameters, struct syscall_info *call_info)
{
struct saved_parameters *sp =
malloc(sizeof(struct saved_parameters));
char *hash_key = (char*)malloc(SP_KEY_SIZE);
if(sp == NULL || hash_key == NULL)
{
if(sp != NULL)
free(sp);
if(hash_key != NULL)
free(hash_key);
return -1;
}
memset(sp, 0, sizeof(struct saved_parameters));
memset(hash_key, 0, SP_KEY_SIZE);
sp_create_hash_key(call_info->pid, call_info->tid,
call_info->number,
hash_key);
sp->parameters = parameters;
sp->timestamp = time(NULL);
sp->pid = call_info->pid;
sp->tid = call_info->tid;
sp->call_number = call_info->number;
if(sp_list_head == NULL)
{
sp_list_head = sp;
}
else
{
sp->next = sp_list_head;
sp->prev = NULL;
sp_list_head->prev = sp;
sp_list_head = sp;
}
hashtable_insert(sp_table,
hash_key,
sp);
return 1;
}
struct saved_parameters *sp_find_parameters(uint32_t pid, uint32_t tid, uint32_t call_number)
{
struct saved_parameters *result = NULL;
char *hash_key = (char*)malloc(SP_KEY_SIZE);
if(hash_key == NULL)
{
return NULL;
}
sp_create_hash_key(pid, tid, call_number,
hash_key);
result = (struct saved_parameters *)
hashtable_search(sp_table,
hash_key);
free(hash_key);
return result;
}
struct saved_parameters *sp_find_and_remove_parameters(uint32_t pid,
uint32_t tid, uint32_t call_number)
{
struct saved_parameters *result = NULL;
char *hash_key = (char*)malloc(SP_KEY_SIZE);
if(hash_key == NULL)
{
return NULL;
}
sp_create_hash_key(pid, tid, call_number,
hash_key);
result = (struct saved_parameters *)
hashtable_remove(sp_table,
hash_key);
free(hash_key);
if(result != NULL)
{
if(result->prev == NULL)
{
sp_list_head = result->next;
if(result->next != NULL)
{
result->next->prev = NULL;
}
}
else
{
result->prev->next =
result->next;
if(result->next != NULL)
{
result->next->prev =
result->prev;
}
}
}
return result;
}
int sp_equality_fn(void *sp1, void *sp2)
{
char *c1 = (char *)sp1;
char *c2 = (char *)sp2;
int i = 0;
for(i = 0; i < SP_KEY_SIZE; i++)
{
if(c1[i] != c2[i])
{
return 0;
}
}
return 1;
}
int sp_create_hash_key(uint32_t pid, uint32_t tid, uint32_t call_number, char *key_dest)
{
memset(key_dest, 0, SP_KEY_SIZE);
memcpy(key_dest, &pid, sizeof(uint32_t));
memcpy(key_dest+sizeof(uint32_t), &tid, sizeof(uint32_t));
memcpy(key_dest+(sizeof(uint32_t)*2), &call_number, sizeof(uint32_t));
return 1;
}
unsigned int sp_hash_fn(void *value)
{
const char* s_value = (const char*)value;
unsigned int hash = 0;
int c;
int i;
for(i = 0; i < (SP_KEY_SIZE) ; i++)
{
c = s_value[i];
hash = c + (hash << 6) + (hash << 16) - hash;
}
return hash;
}