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/* EtherApe
* Copyright (C) 2001 Juan Toledo
* $Id$
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <sys/types.h>
#include <netinet/in.h>
#include "appdata.h"
#include "conversations.h"
#include "dns.h"
#include "util.h"
/* Some protocols add an item here to help identify further packets of the
* same protocol */
static GList *conversations = NULL;
static long n_conversations = 0;
long active_conversations(void)
{
return n_conversations;
}
/* Returns the item ptr if there is any matching conversation in any of the
* two directions */
/* A zero in any of the ports matches any port number */
static GList
* find_conversation_ptr(address_t * src_address, address_t * dst_address,
guint16 src_port, guint16 dst_port)
{
GList *item = conversations;
conversation_t *conv = NULL;
g_assert(src_address);
g_assert(dst_address);
while (item)
{
conv = item->data;
if ((is_addr_eq(src_address, &conv->src_address)
&& is_addr_eq(dst_address, &conv->dst_address)
&& (!src_port || !conv->src_port || (src_port == conv->src_port))
&& (!dst_port || !conv->dst_port || (dst_port == conv->dst_port))
)
|| (is_addr_eq(src_address, &conv->dst_address)
&& is_addr_eq(dst_address, &conv->src_address)
&& (!src_port || !conv->dst_port || (src_port == conv->dst_port))
&& (!dst_port || !conv->src_port || (dst_port == conv->src_port))
)
)
{
/* found */
break;
}
item = item->next;
}
return item;
} /* find_conversation_ptr */
void
add_conversation (address_t * src_address, address_t * dst_address,
guint16 src_port, guint16 dst_port, const gchar * data)
{
conversation_t *conv = NULL;
const gchar *old_data = NULL;
if (!src_address || !dst_address)
{
g_my_critical("NULL ptr in add_conversation");
return;
}
/* Make sure there is not one such conversation */
if ((old_data = find_conversation (src_address, dst_address,
src_port, dst_port)))
{
if (!strcmp (old_data, data))
g_my_critical
("Conflicting conversations %s:%d-%s:%d in add_conversation",
address_to_str (src_address), src_port,
address_to_str (dst_address), dst_port);
else
g_my_debug
("Conversation %s:%d-%s:%d %s already exists in add_conversation",
address_to_str (src_address), src_port,
address_to_str (dst_address), dst_port, data);
return;
}
g_my_debug ("Adding new conversation %s:%d-%s:%d %s",
address_to_str (src_address), src_port,
address_to_str (dst_address), dst_port, data);
conv = g_malloc (sizeof (conversation_t));
g_assert(conv);
address_copy(&conv->src_address, src_address);
address_copy(&conv->dst_address, dst_address);
conv->src_port = src_port;
conv->dst_port = dst_port;
conv->data = g_strdup (data);
conversations = g_list_prepend (conversations, conv);
n_conversations++;
} /* add_conversation */
/* Returns the data if there is any matching conversation in any of the
* two directions */
/* A zero in any of the ports matches any port number */
const gchar*
find_conversation (address_t * src_address, address_t * dst_address,
guint16 src_port, guint16 dst_port)
{
GList *item;
if (!src_address || !dst_address)
{
g_my_critical("NULL ptr in find_conversation");
return NULL;
}
item = find_conversation_ptr(src_address, dst_address, src_port, dst_port);
if (item)
{
/* found */
conversation_t *conv = item->data;
return conv->data;
}
else
return NULL;
}
/* removes all conversations with the specified addresses */
void
delete_conversation_link(address_t * src_address, address_t * dst_address)
{
GList *item;
if (!src_address || !dst_address)
{
g_my_critical("NULL ptr in delete_conversation_link");
return;
}
while ( (item = find_conversation_ptr(src_address, dst_address, 0, 0)) )
{
conversation_t *conv = NULL;
conv = item->data;
g_my_debug ("Removing conversation %s:%d-%s:%d %s",
address_to_str (&conv->src_address), conv->src_port,
address_to_str (&conv->dst_address), conv->dst_port, conv->data);
g_free (conv->data);
g_free (conv);
conversations = g_list_delete_link(conversations, item);
n_conversations--;
}
}
void
delete_conversations (void)
{
GList *item = conversations;
conversation_t *conv = NULL;
while (item)
{
conv = item->data;
g_my_debug ("Removing conversation %s:%d-%s:%d %s",
address_to_str (&conv->src_address), conv->src_port,
address_to_str (&conv->dst_address), conv->dst_port, conv->data);
g_free (conv->data);
g_free (conv);
item = item->next;
n_conversations--;
}
g_list_free (conversations);
conversations = NULL;
} /* delete_conversations */
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