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gdns.c
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gdns.c
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/**
* gdns.c -- hosts resolver
* Copyright (C) 2009-2013 by Gerardo Orellana <[email protected]>
* GoAccess - An Ncurses apache weblog analyzer & interactive viewer
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* A copy of the GNU General Public License is attached to this
* source distribution for its full text.
*
* Visit http://goaccess.prosoftcorp.com for new releases.
*/
#define _MULTI_THREADED
#ifdef __FreeBSD__
#include <sys/socket.h>
#endif
#include <pthread.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <ctype.h>
#include <errno.h>
#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <time.h>
#include <unistd.h>
#include "gdns.h"
#include "error.h"
#include "xmalloc.h"
#include "goaccess.h"
#include "parser.h"
#include "util.h"
GDnsThread gdns_thread;
static GDnsQueue *gdns_queue;
/* initialize queue */
void
gqueue_init (GDnsQueue * q, int capacity)
{
q->head = 0;
q->tail = -1;
q->size = 0;
q->capacity = capacity;
}
/* get current size of queue */
int
gqueue_size (GDnsQueue * q)
{
return q->size;
}
/* is the queue empty */
int
gqueue_empty (GDnsQueue * q)
{
return q->size == 0;
}
/* is the queue full */
int
gqueue_full (GDnsQueue * q)
{
return q->size == q->capacity;
}
/* destroy queue */
void
gqueue_destroy (GDnsQueue * q)
{
free (q);
}
/* add item to the queue */
int
gqueue_enqueue (GDnsQueue * q, char *item)
{
if (gqueue_full (q))
return -1;
q->tail = (q->tail + 1) % q->capacity;
strcpy (q->buffer[q->tail], item);
q->size++;
return 0;
}
int
gqueue_find (GDnsQueue * q, const char *item)
{
int i;
if (gqueue_empty (q))
return 0;
for (i = 0; i < q->size; i++) {
if (strcmp (item, q->buffer[i]) == 0)
return 1;
}
return 0;
}
/* remove an item from the queue */
char *
gqueue_dequeue (GDnsQueue * q)
{
char *item;
if (gqueue_empty (q))
return NULL;
item = q->buffer[q->head];
q->head = (q->head + 1) % q->capacity;
q->size--;
return item;
}
/* get the corresponding host given an address */
static char *
reverse_host (const struct sockaddr *a, socklen_t length)
{
char h[H_SIZE];
int flags, st;
flags = NI_NAMEREQD;
st = getnameinfo (a, length, h, H_SIZE, NULL, 0, flags);
if (!st)
return alloc_string (h);
return alloc_string (gai_strerror (st));
}
/* determine if IPv4 or IPv6 and resolve */
char *
reverse_ip (char *str)
{
union
{
struct sockaddr addr;
struct sockaddr_in6 addr6;
struct sockaddr_in addr4;
} a;
if (str == NULL || *str == '\0')
return NULL;
memset (&a, 0, sizeof (a));
if (1 == inet_pton (AF_INET, str, &a.addr4.sin_addr)) {
a.addr4.sin_family = AF_INET;
return reverse_host (&a.addr, sizeof (a.addr4));
} else if (1 == inet_pton (AF_INET6, str, &a.addr6.sin6_addr)) {
a.addr6.sin6_family = AF_INET6;
return reverse_host (&a.addr, sizeof (a.addr6));
}
return NULL;
}
/* producer */
void
dns_resolver (char *addr)
{
pthread_mutex_lock (&gdns_thread.mutex);
if (!gqueue_full (gdns_queue) && !gqueue_find (gdns_queue, addr)) {
g_hash_table_replace (ht_hostnames, g_strdup (addr), NULL);
gqueue_enqueue (gdns_queue, addr);
pthread_cond_broadcast (&gdns_thread.not_empty);
}
pthread_mutex_unlock (&gdns_thread.mutex);
}
/* consumer */
static void
dns_worker (void GO_UNUSED (*ptr_data))
{
char *ip = NULL, *host = NULL;
while (1) {
pthread_mutex_lock (&gdns_thread.mutex);
/* wait until an item has been added to the queue */
while (gqueue_empty (gdns_queue))
pthread_cond_wait (&gdns_thread.not_empty, &gdns_thread.mutex);
ip = gqueue_dequeue (gdns_queue);
pthread_mutex_unlock (&gdns_thread.mutex);
host = reverse_ip (ip);
pthread_mutex_lock (&gdns_thread.mutex);
if (!active_gdns) {
if (host)
free (host);
break;
}
if (host != NULL && active_gdns)
g_hash_table_replace (ht_hostnames, g_strdup (ip), host);
pthread_cond_signal (&gdns_thread.not_full);
pthread_mutex_unlock (&gdns_thread.mutex);
}
}
/* init queue and dns thread */
void
gdns_init (void)
{
gdns_queue = xmalloc (sizeof (GDnsQueue));
gqueue_init (gdns_queue, QUEUE_SIZE);
if (pthread_cond_init (&(gdns_thread.not_empty), NULL))
error_handler (__PRETTY_FUNCTION__, __FILE__, __LINE__, "Failed cond");
if (pthread_cond_init (&(gdns_thread.not_full), NULL))
error_handler (__PRETTY_FUNCTION__, __FILE__, __LINE__, "Failed cond");
if (pthread_mutex_init (&(gdns_thread.mutex), NULL))
error_handler (__PRETTY_FUNCTION__, __FILE__, __LINE__, "Failed mutex");
}
/* destroy queue */
void
gdns_free_queue (void)
{
gqueue_destroy (gdns_queue);
}
/* create a dns thread */
void
gdns_thread_create (void)
{
pthread_create (&(gdns_thread.thread), NULL, (void *) &dns_worker, NULL);
pthread_detach (gdns_thread.thread);
}