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wireshark/epan/conversation.c

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/* conversation.c
* Routines for building lists of packets that are part of a "conversation"
*
* $Id: conversation.c,v 1.4 2000/11/18 06:51:42 guy Exp $
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@zing.org>
* Copyright 1998 Gerald Combs
*
*
* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <stdio.h>
#ifdef HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif
#ifdef HAVE_NETINET_IN_H
# include <netinet/in.h>
#endif
#include <string.h>
#include <glib.h>
#include "packet.h"
#include "conversation.h"
/*
* Hash table for conversations with no wildcards.
*/
static GHashTable *conversation_hashtable_exact = NULL;
/*
* Hash table for conversations with wildcard destination address.
*/
static GHashTable *conversation_hashtable_no_dst_addr = NULL;
/*
* Hash table for conversations with wildcard destination port.
*/
static GHashTable *conversation_hashtable_no_dst_port = NULL;
/*
* Hash table for conversations with wildcard destination address and port.
*/
static GHashTable *conversation_hashtable_no_dst = NULL;
static GMemChunk *conversation_key_chunk = NULL;
static GMemChunk *conversation_chunk = NULL;
#ifdef __NOT_USED__
typedef struct conversation_key {
struct conversation_key *next;
address src;
address dst;
port_type ptype;
guint32 port_src;
guint32 port_dst;
} conversation_key;
#endif
/*
* Linked list of conversation keys, so we can, before freeing them all,
* free the address data allocations associated with them.
*/
static conversation_key *conversation_keys;
static guint32 new_index;
static int conversation_init_count = 200;
/*
* Compute the hash value for a given set of source and destination
* addresses and ports if the match is to be exact.
*/
static guint
conversation_hash_exact(gconstpointer v)
{
conversation_key *key = (conversation_key *)v;
guint hash_val;
int i;
hash_val = 0;
for (i = 0; i < key->src.len; i++)
hash_val += key->src.data[i];
hash_val += key->port_src;
for (i = 0; i < key->dst.len; i++)
hash_val += key->dst.data[i];
hash_val += key->port_dst;
return hash_val;
}
/*
* Compare two conversation keys for an exact match.
*/
static gint
conversation_match_exact(gconstpointer v, gconstpointer w)
{
conversation_key *v1 = (conversation_key *)v;
conversation_key *v2 = (conversation_key *)w;
if (v1->ptype != v2->ptype)
return 0; /* different types of port */
/*
* Are the first and second source ports the same, the first and
* second destination ports the same, the first and second source
* addresses the same, and the first and second destination
* addresses the same?
*/
if (v1->port_src == v2->port_src &&
v1->port_dst == v2->port_dst &&
v1->src.type == v2->src.type &&
v1->src.len == v2->src.len &&
memcmp(v1->src.data, v2->src.data, v1->src.len) == 0 &&
v1->dst.type == v2->dst.type &&
v1->dst.type == v2->dst.type &&
v1->dst.len == v2->dst.len &&
memcmp(v1->dst.data, v2->dst.data, v1->dst.len) == 0) {
/*
* Yes. It's the same conversation, and the two
* address/port pairs are going in the same direction.
*/
return 1;
}
/*
* Is the first destination port the same as the second source
* port, the first source port the same as the second destination
* port, the first destination address the same as the second
* source address, and the first source address the same as the
* second destination address?
*/
if (v1->port_dst == v2->port_src &&
v1->port_src == v2->port_dst &&
v1->dst.type == v2->src.type &&
v1->dst.len == v2->src.len &&
memcmp(v1->dst.data, v2->src.data, v1->dst.len) == 0 &&
v1->src.type == v2->dst.type &&
v1->src.len == v2->dst.len &&
memcmp(v1->src.data, v2->dst.data, v1->src.len) == 0) {
/*
* Yes. It's the same conversation, and the two
* address/port pairs are going in opposite directions.
*/
return 1;
}
/*
* The addresses or the ports don't match.
*/
return 0;
}
/*
* Compute the hash value for a given set of source and destination
* addresses and ports if the match has a wildcard destination address.
*/
static guint
conversation_hash_no_dst_addr(gconstpointer v)
{
conversation_key *key = (conversation_key *)v;
guint hash_val;
int i;
hash_val = 0;
for (i = 0; i < key->src.len; i++)
hash_val += key->src.data[i];
hash_val += key->port_src;
hash_val += key->port_dst;
return hash_val;
}
/*
* Compare two conversation keys, except for the destination address.
* We don't check both directions of the conversation - the routine
* doing the hash lookup has to do two searches, as the hash key
* will be different for the two directions.
*/
static gint
conversation_match_no_dst_addr(gconstpointer v, gconstpointer w)
{
conversation_key *v1 = (conversation_key *)v;
conversation_key *v2 = (conversation_key *)w;
if (v1->ptype != v2->ptype)
return 0; /* different types of port */
/*
* Are the first and second source ports the same, the first and
* second destination ports the same, and the first and second
* source addresses the same?
*/
if (v1->port_src == v2->port_src &&
v1->port_dst == v2->port_dst &&
v1->src.type == v2->src.type &&
v1->src.len == v2->src.len &&
memcmp(v1->src.data, v2->src.data, v1->src.len) == 0) {
/*
* Yes. It's the same conversation, and the two
* address/port pairs are going in the same direction.
*/
return 1;
}
/*
* The addresses or the ports don't match.
*/
return 0;
}
/*
* Compute the hash value for a given set of source and destination
* addresses and ports if the match has a wildcard destination port.
*/
static guint
conversation_hash_no_dst_port(gconstpointer v)
{
conversation_key *key = (conversation_key *)v;
guint hash_val;
int i;
hash_val = 0;
for (i = 0; i < key->src.len; i++)
hash_val += key->src.data[i];
hash_val += key->port_src;
for (i = 0; i < key->dst.len; i++)
hash_val += key->dst.data[i];
return hash_val;
}
/*
* Compare two conversation keys, except for the destination port.
* We don't check both directions of the conversation - the routine
* doing the hash lookup has to do two searches, as the hash key
* will be different for the two directions.
*/
static gint
conversation_match_no_dst_port(gconstpointer v, gconstpointer w)
{
conversation_key *v1 = (conversation_key *)v;
conversation_key *v2 = (conversation_key *)w;
if (v1->ptype != v2->ptype)
return 0; /* different types of port */
/*
* Are the first and second source ports the same, the first and
* second source addresses the same, and the first and second
* destination addresses the same?
*/
if (v1->port_src == v2->port_src &&
v1->src.type == v2->src.type &&
v1->src.len == v2->src.len &&
memcmp(v1->src.data, v2->src.data, v1->src.len) == 0 &&
v1->dst.type == v2->dst.type &&
v1->dst.type == v2->dst.type &&
v1->dst.len == v2->dst.len &&
memcmp(v1->dst.data, v2->dst.data, v1->dst.len) == 0) {
/*
* Yes. It's the same conversation, and the two
* address/port pairs are going in the same direction.
*/
return 1;
}
/*
* The addresses or the ports don't match.
*/
return 0;
}
/*
* Compute the hash value for a given set of source and destination
* addresses and ports if the match has a wildcard destination.
*/
static guint
conversation_hash_no_dst(gconstpointer v)
{
conversation_key *key = (conversation_key *)v;
guint hash_val;
int i;
hash_val = 0;
for (i = 0; i < key->src.len; i++)
hash_val += key->src.data[i];
hash_val += key->port_src;
return hash_val;
}
/*
* Compare the source address and port in the two conversation keys.
* We don't check both directions of the conversation - the routine
* doing the hash lookup has to do two searches, as the hash key
* will be different for the two directions.
*/
static gint
conversation_match_no_dst(gconstpointer v, gconstpointer w)
{
conversation_key *v1 = (conversation_key *)v;
conversation_key *v2 = (conversation_key *)w;
if (v1->ptype != v2->ptype)
return 0; /* different types of port */
/*
* Are the first and second source ports the same and the first
* and second source addresses the same?
*/
if (v1->port_src == v2->port_src &&
v1->src.type == v2->src.type &&
v1->src.len == v2->src.len &&
memcmp(v1->src.data, v2->src.data, v1->src.len) == 0) {
/*
* Yes. It's the same conversation, and the two
* address/port pairs are going in the same direction.
*/
return 1;
}
/*
* The addresses or the ports don't match.
*/
return 0;
}
/*
* Initialize some variables every time a file is loaded or re-loaded.
* Destroy all existing conversations, and create a new hash table
* for the conversations in the new file.
*/
void
conversation_init(void)
{
conversation_key *key;
/*
* Free the addresses associated with the conversation keys.
*/
for (key = conversation_keys; key != NULL; key = key->next) {
/*
* Grr. I guess the theory here is that freeing
* something sure as heck modifies it, so you
* want to ban attempts to free it, but, alas,
* if we make the "data" field of an "address"
* structure not a "const", the compiler whines if
* we try to make it point into the data for a packet,
* as that's a "const" array (and should be, as dissectors
* shouldn't trash it).
*
* So we cast the complaint into oblivion, and rely on
* the fact that these addresses are known to have had
* their data mallocated, i.e. they don't point into,
* say, the middle of the data for a packet.
*/
g_free((gpointer)key->src.data);
g_free((gpointer)key->dst.data);
}
conversation_keys = NULL;
if (conversation_hashtable_exact != NULL)
g_hash_table_destroy(conversation_hashtable_exact);
if (conversation_hashtable_no_dst_addr != NULL)
g_hash_table_destroy(conversation_hashtable_no_dst_addr);
if (conversation_hashtable_no_dst_port != NULL)
g_hash_table_destroy(conversation_hashtable_no_dst_port);
if (conversation_hashtable_no_dst != NULL)
g_hash_table_destroy(conversation_hashtable_no_dst);
if (conversation_key_chunk != NULL)
g_mem_chunk_destroy(conversation_key_chunk);
if (conversation_chunk != NULL)
g_mem_chunk_destroy(conversation_chunk);
conversation_hashtable_exact =
g_hash_table_new(conversation_hash_exact,
conversation_match_exact);
conversation_hashtable_no_dst_addr =
g_hash_table_new(conversation_hash_no_dst_addr,
conversation_match_no_dst_addr);
conversation_hashtable_no_dst_port =
g_hash_table_new(conversation_hash_no_dst_port,
conversation_match_no_dst_port);
conversation_hashtable_no_dst =
g_hash_table_new(conversation_hash_no_dst,
conversation_match_no_dst);
conversation_key_chunk = g_mem_chunk_new("conversation_key_chunk",
sizeof(conversation_key),
conversation_init_count * sizeof(struct conversation_key),
G_ALLOC_AND_FREE);
conversation_chunk = g_mem_chunk_new("conversation_chunk",
sizeof(conversation_t),
conversation_init_count * sizeof(conversation_t),
G_ALLOC_AND_FREE);
/*
* Start the conversation indices over at 0.
*/
new_index = 0;
}
/*
* Copy an address, allocating a new buffer for the address data.
*/
static void
copy_address(address *to, address *from)
{
guint8 *data;
to->type = from->type;
to->len = from->len;
data = g_malloc(from->len);
memcpy(data, from->data, from->len);
to->data = data;
}
/*
* Given source and destination addresses and ports for a packet,
* create a new conversation to contain packets between those address/port
* pairs. The options field is used to flag the destination address/port
* are not given and any value is acceptable.
*/
conversation_t *
conversation_new(address *src, address *dst, port_type ptype,
guint32 src_port, guint32 dst_port, void *data, guint options)
{
conversation_t *conversation;
conversation_key *new_key;
new_key = g_mem_chunk_alloc(conversation_key_chunk);
new_key->next = conversation_keys;
conversation_keys = new_key;
copy_address(&new_key->src, src);
copy_address(&new_key->dst, dst);
new_key->ptype = ptype;
new_key->port_src = src_port;
new_key->port_dst = dst_port;
conversation = g_mem_chunk_alloc(conversation_chunk);
conversation->index = new_index;
conversation->data = data;
/* clear dissector pointer */
conversation->dissector.new_d = NULL;
/* set the options and key pointer */
conversation->options = options;
conversation->key_ptr = new_key;
new_index++;
if (options & NO_DST_ADDR) {
if (options & NO_DST_PORT) {
g_hash_table_insert(conversation_hashtable_no_dst,
new_key, conversation);
} else {
g_hash_table_insert(conversation_hashtable_no_dst_addr,
new_key, conversation);
}
} else {
if (options & NO_DST_PORT) {
g_hash_table_insert(conversation_hashtable_no_dst_port,
new_key, conversation);
} else {
g_hash_table_insert(conversation_hashtable_exact,
new_key, conversation);
}
}
return conversation;
}
/* Set the destination port in a key. Remove the original from table,
update the options and port values, insert the updated key.
*/
void conversation_set_port( conversation_t *conv, guint32 port){
/*
* If the destination port has already been set, don't set it
* again.
*/
if (!(conv->options & NO_DST_PORT))
return;
if (conv->options & NO_DST_ADDR) {
g_hash_table_remove(conversation_hashtable_no_dst,
conv->key_ptr);
} else {
g_hash_table_remove(conversation_hashtable_no_dst_port,
conv->key_ptr);
}
conv->options &= ~NO_DST_PORT;
conv->key_ptr->port_dst = port;
if (conv->options & NO_DST_ADDR) {
g_hash_table_insert(conversation_hashtable_no_dst_addr,
conv->key_ptr, conv);
} else {
g_hash_table_insert(conversation_hashtable_exact,
conv->key_ptr, conv);
}
}
/* Set the destination address in a key. Remove the original from
table, update the options and port values, insert the updated key.
*/
void conversation_set_addr( conversation_t *conv, address *addr){
/*
* If the destination address has already been set, don't set it
* again.
*/
if (!(conv->options & NO_DST_ADDR))
return;
if (conv->options & NO_DST_PORT) {
g_hash_table_remove(conversation_hashtable_no_dst,
conv->key_ptr);
} else {
g_hash_table_remove(conversation_hashtable_no_dst_addr,
conv->key_ptr);
}
conv->options &= ~NO_DST_ADDR;
copy_address(&conv->key_ptr->dst, addr);
if (conv->options & NO_DST_PORT) {
g_hash_table_insert(conversation_hashtable_no_dst_port,
conv->key_ptr, conv);
} else {
g_hash_table_insert(conversation_hashtable_exact,
conv->key_ptr, conv);
}
}
static conversation_t *
conversation_match(GHashTable *hashtable, address *src, address *dst,
port_type ptype, guint32 src_port, guint32 dst_port)
{
conversation_key key;
/*
* We don't make a copy of the address data, we just copy the
* pointer to it, as "key" disappears when we return.
*/
key.src = *src;
key.dst = *dst;
key.ptype = ptype;
key.port_src = src_port;
key.port_dst = dst_port;
return g_hash_table_lookup(hashtable, &key);
}
/*
* Given source and destination addresses and ports for a packet,
* search for a conversation containing packets between those address/port
* pairs. Returns NULL if not found. If the NO_DEST_ADDR and/or NO_DEST_PORT
* flags are set in the conversation options field, that value will not
* be used.
*/
conversation_t *
find_conversation(address *src, address *dst, port_type ptype,
guint32 src_port, guint32 dst_port, guint options)
{
conversation_t *conversation;
if (options & NO_DST_ADDR) {
if (options & NO_DST_PORT) {
/*
* Wildcard the address and port - first try looking
* for a conversation with the specified source
* address and port, then try looking for one with a
* source address and port that's the specified
* *destination* address and port (this packet may be
* going in the opposite direction from the first
* packet in the conversation).
*/
conversation =
conversation_match(conversation_hashtable_no_dst,
src, dst, ptype, src_port, dst_port);
if (conversation != NULL)
return conversation;
return conversation_match(conversation_hashtable_no_dst,
dst, src, ptype, dst_port, src_port);
} else {
/*
* Wildcard the address - first try looking for a
* conversation with the specified source address
* and port and destination port, then try looking
* for one with a source address and port that's
* the specified *destination* address and port and
* a destination port that's the specified *source*
* port (this packet may be going in the opposite
* direction from the first packet in the conversation).
*/
conversation =
conversation_match(conversation_hashtable_no_dst_addr,
src, dst, ptype, src_port, dst_port);
if (conversation != NULL)
return conversation;
return conversation_match(conversation_hashtable_no_dst_addr,
dst, src, ptype, dst_port, src_port);
}
} else {
if (options & NO_DST_PORT) {
/*
* Wildcard the port - first try looking for a
* conversation with the specified source address
* and port and destination address, then try looking
* for one with a source address and port that's
* the specified *destination* address and port and
* a destination address that's the specified *source*
* address (this packet may be going in the opposite
* direction from the first packet in the conversation).
*/
conversation =
conversation_match(conversation_hashtable_no_dst_port,
src, dst, ptype, src_port, dst_port);
if (conversation != NULL)
return conversation;
return conversation_match(conversation_hashtable_no_dst_port,
dst, src, ptype, dst_port, src_port);
} else {
/*
* Search for an exact match. That search checks both
* directions.
*/
return conversation_match(conversation_hashtable_exact,
src, dst, ptype, src_port, dst_port);
}
}
}
/*
* Set the dissector for a conversation.
*/
void
old_conversation_set_dissector(conversation_t *conversation,
old_dissector_t dissector)
{
conversation->is_old_dissector = TRUE;
conversation->dissector.old_d = dissector;
}
void
conversation_set_dissector(conversation_t *conversation,
dissector_t dissector)
{
conversation->is_old_dissector = FALSE;
conversation->dissector.new_d = dissector;
}
/*
* Given source and destination addresses and ports for a packet,
* search for a conversational dissector.
* If found, call it and return TRUE, otherwise return FALSE.
*
* Will search for a exact match (src & dst), then search for wild
* card matches: try to match any port on the destination address first,
* then try to match any address on the port, then try to match any
* address and any port.
*/
gboolean
old_try_conversation_dissector(address *src, address *dst, port_type ptype,
guint32 src_port, guint32 dst_port, const u_char *pd, int offset,
frame_data *fd, proto_tree *tree)
{
conversation_t *conversation;
tvbuff_t *tvb;
conversation = find_conversation(src, dst, ptype, src_port, dst_port, 0);
if (conversation == NULL)
conversation = find_conversation(src, dst, ptype, src_port, dst_port, NO_DST_ADDR);
if (conversation == NULL)
conversation = find_conversation(src, dst, ptype, src_port, dst_port, NO_DST_PORT);
if (conversation == NULL)
conversation = find_conversation(src, dst, ptype, src_port, dst_port,
NO_DST_PORT | NO_DST_ADDR);
if (conversation != NULL) {
if (conversation->is_old_dissector) {
if (conversation->dissector.old_d == NULL)
return FALSE;
(*conversation->dissector.old_d)(pd, offset, fd, tree);
} else {
if (conversation->dissector.new_d == NULL)
return FALSE;
/*
* Old dissector calling new dissector; use
* "tvb_create_from_top()" to remap.
*
* XXX - what about the "pd" argument? Do
* any dissectors not just pass that along and
* let the "offset" argument handle stepping
* through the packet?
*/
tvb = tvb_create_from_top(offset);
(*conversation->dissector.new_d)(tvb, &pi, tree);
}
return TRUE;
}
return FALSE;
}
/*
* Given source and destination addresses and ports for a packet,
* search for a conversational dissector.
* If found, call it and return TRUE, otherwise return FALSE.
*
* Will search for a exact match (src & dst), then search for wild
* card matches: try to match any port on the destination address first,
* then try to match any address on the port, then try to match any
* address and any port.
*/
gboolean
try_conversation_dissector(address *src, address *dst, port_type ptype,
guint32 src_port, guint32 dst_port, tvbuff_t *tvb, packet_info *pinfo,
proto_tree *tree)
{
conversation_t *conversation;
const guint8 *pd;
int offset;
conversation = find_conversation(src, dst, ptype, src_port, dst_port, 0);
if (conversation == NULL)
conversation = find_conversation(src, dst, ptype, src_port, dst_port, NO_DST_ADDR);
if (conversation == NULL)
conversation = find_conversation(src, dst, ptype, src_port, dst_port, NO_DST_PORT);
if (conversation == NULL)
conversation = find_conversation(src, dst, ptype, src_port, dst_port,
NO_DST_PORT | NO_DST_ADDR);
if (conversation != NULL) {
if (conversation->is_old_dissector) {
/*
* New dissector calling old dissector; use
* "tvb_compat()" to remap.
*
* "is_old_dissector" won't be set unless
* "dissector.old_d" is set.
*/
tvb_compat(tvb, &pd, &offset);
(*conversation->dissector.old_d)(pd, offset, pinfo->fd,
tree);
} else {
/*
* Do we have a conversation dissector?
*/
if (conversation->dissector.new_d == NULL) {
/*
* No, so we can't call it.
*/
return FALSE;
}
(*conversation->dissector.new_d)(tvb, pinfo, tree);
return TRUE;
}
}
return FALSE;
}
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