diff options
Diffstat (limited to 'epan')
| -rw-r--r-- | epan/circuit.c | 278 | ||||
| -rw-r--r-- | epan/circuit.h | 66 | ||||
| -rw-r--r-- | epan/epan.h | 5 |
3 files changed, 346 insertions, 3 deletions
diff --git a/epan/circuit.c b/epan/circuit.c new file mode 100644 index 0000000000..d12fd6c1f1 --- /dev/null +++ b/epan/circuit.c @@ -0,0 +1,278 @@ +/* circuit.c + * Routines for building lists of packets that are part of a "circuit" + * + * $Id: circuit.c,v 1.1 2002/10/22 08:43:44 guy Exp $ + * + * Ethereal - Network traffic analyzer + * By Gerald Combs <gerald@ethereal.com> + * 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> + +#include <string.h> +#include <glib.h> +#include "packet.h" +#include "circuit.h" + +/* + * Hash table for circuits. + */ +static GHashTable *circuit_hashtable = NULL; + +static GMemChunk *circuit_key_chunk = NULL; +static GMemChunk *circuit_chunk = NULL; + +static guint32 new_index; + +static int circuit_init_count = 200; + +/* + * Protocol-specific data attached to a circuit_t structure - protocol + * index and opaque pointer. + */ +typedef struct _circuit_proto_data { + int proto; + void *proto_data; +} circuit_proto_data; + +static GMemChunk *circuit_proto_data_area = NULL; + +/* + * Compute the hash value for a circuit. + */ +static guint +circuit_hash(gconstpointer v) +{ + circuit_key *key = (circuit_key *)v; + + return key->ctype ^ key->circuit_id; +} + +/* + * Compare two circuit keys. + */ +static gint +circuit_match(gconstpointer v, gconstpointer w) +{ + circuit_key *v1 = (circuit_key *)v; + circuit_key *v2 = (circuit_key *)w; + + return v1->ctype == v2->ctype && v1->circuit_id == v2->circuit_id; +} + +/* + * Initialize some variables every time a file is loaded or re-loaded. + * Destroy all existing circuits, and create a new hash table + * for the circuits in the new file. + */ +void +circuit_init(void) +{ + if (circuit_hashtable != NULL) + g_hash_table_destroy(circuit_hashtable); + if (circuit_key_chunk != NULL) + g_mem_chunk_destroy(circuit_key_chunk); + if (circuit_chunk != NULL) + g_mem_chunk_destroy(circuit_chunk); + + /* + * Free up any space allocated for circuit protocol data + * areas. + * + * We can free the space, as the structures it contains are + * pointed to by circuit data structures that were freed + * above. + */ + if (circuit_proto_data_area != NULL) + g_mem_chunk_destroy(circuit_proto_data_area); + + circuit_hashtable = g_hash_table_new(circuit_hash, circuit_match); + circuit_key_chunk = g_mem_chunk_new("circuit_key_chunk", + sizeof(circuit_key), + circuit_init_count * sizeof(struct circuit_key), + G_ALLOC_AND_FREE); + circuit_chunk = g_mem_chunk_new("circuit_chunk", + sizeof(circuit_t), + circuit_init_count * sizeof(circuit_t), + G_ALLOC_AND_FREE); + + /* + * Allocate a new area for circuit protocol data items. + */ + circuit_proto_data_area = g_mem_chunk_new("circuit_proto_data_area", + sizeof(circuit_proto_data), 20 * sizeof(circuit_proto_data), /* FIXME*/ + G_ALLOC_ONLY); + + /* + * Start the circuit indices over at 0. + */ + new_index = 0; +} + +/* + * Given a circuit type and circuit ID for a packet, create a new circuit + * to contain packets for that circuit. + */ +circuit_t * +circuit_new(circuit_type ctype, guint32 circuit_id) +{ + circuit_t *circuit; + circuit_key *new_key; + + new_key = g_mem_chunk_alloc(circuit_key_chunk); + new_key->ctype = ctype; + new_key->circuit_id = circuit_id; + + circuit = g_mem_chunk_alloc(circuit_chunk); + circuit->index = new_index; + circuit->data_list = NULL; + +/* clear dissector handle */ + circuit->dissector_handle = NULL; + +/* set the options and key pointer */ + circuit->key_ptr = new_key; + + new_index++; + + g_hash_table_insert(circuit_hashtable, new_key, circuit); + + return circuit; +} + +/* + * Given a circuit type and ID, search for the corresponding circuit. + * Returns NULL if not found. + */ +circuit_t * +find_circuit(circuit_type ctype, guint32 circuit_id) +{ + circuit_key key; + + key.ctype = ctype; + key.circuit_id = circuit_id; + return g_hash_table_lookup(circuit_hashtable, &key); +} + +static gint +p_compare(gconstpointer a, gconstpointer b) +{ + if (((circuit_proto_data *)a)->proto > ((circuit_proto_data *)b)->proto) + return 1; + else if (((circuit_proto_data *)a)->proto == ((circuit_proto_data *)b)->proto) + return 0; + else + return -1; +} + +void +circuit_add_proto_data(circuit_t *conv, int proto, void *proto_data) +{ + circuit_proto_data *p1 = g_mem_chunk_alloc(circuit_proto_data_area); + + p1->proto = proto; + p1->proto_data = proto_data; + + /* Add it to the list of items for this circuit. */ + + conv->data_list = g_slist_insert_sorted(conv->data_list, (gpointer *)p1, + p_compare); +} + +void * +circuit_get_proto_data(circuit_t *conv, int proto) +{ + circuit_proto_data temp, *p1; + GSList *item; + + temp.proto = proto; + temp.proto_data = NULL; + + item = g_slist_find_custom(conv->data_list, (gpointer *)&temp, + p_compare); + + if (item != NULL) { + p1 = (circuit_proto_data *)item->data; + return p1->proto_data; + } + + return NULL; +} + +void +circuit_delete_proto_data(circuit_t *conv, int proto) +{ + circuit_proto_data temp; + GSList *item; + + temp.proto = proto; + temp.proto_data = NULL; + + item = g_slist_find_custom(conv->data_list, (gpointer *)&temp, + p_compare); + + if (item != NULL) + conv->data_list = g_slist_remove(conv->data_list, item); +} + +void +circuit_set_dissector(circuit_t *circuit, + dissector_handle_t handle) +{ + circuit->dissector_handle = handle; +} + +/* + * Given a circuit type and ID for a packet, search for a matching + * circuit and, if found and it has a circuit dissector, + * call that dissector and return TRUE, otherwise return FALSE. + */ +gboolean +try_circuit_dissector(circuit_type ctype, guint32 circuit_id, tvbuff_t *tvb, + packet_info *pinfo, proto_tree *tree) +{ + circuit_t *circuit; + guint16 saved_can_desegment; + + /* can_desegment is set to 2 by anyone which offers this api/service. + then everytime a subdissector is called it is decremented by one. + thus only the subdissector immediately ontop of whoever offers this + service can use it. + */ + saved_can_desegment=pinfo->can_desegment; + pinfo->can_desegment = saved_can_desegment-(saved_can_desegment>0); + + circuit = find_circuit(ctype, circuit_id); + + if (circuit != NULL) { + if (circuit->dissector_handle == NULL){ + pinfo->can_desegment=saved_can_desegment; + return FALSE; + } + call_dissector(circuit->dissector_handle, tvb, pinfo, + tree); + pinfo->can_desegment=saved_can_desegment; + return TRUE; + } + pinfo->can_desegment=saved_can_desegment; + return FALSE; +} diff --git a/epan/circuit.h b/epan/circuit.h new file mode 100644 index 0000000000..87a04eceac --- /dev/null +++ b/epan/circuit.h @@ -0,0 +1,66 @@ +/* circuit.h + * Routines for building lists of packets that are part of a "circuit" + * + * $Id: circuit.h,v 1.1 2002/10/22 08:43:44 guy Exp $ + * + * Ethereal - Network traffic analyzer + * By Gerald Combs <gerald@ethereal.com> + * 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. + */ + +#ifndef __CIRCUIT_H__ +#define __CIRCUIT_H__ + +#include "packet.h" /* for circuit dissector type */ + +/* + * Data structure representing a circuit. + */ +typedef struct circuit_key { + circuit_type ctype; + guint32 circuit_id; +} circuit_key; + +typedef struct circuit { + struct circuit *next; /* pointer to next circuit on hash chain */ + guint32 index; /* unique ID for circuit */ + GSList *data_list; /* list of data associated with circuit */ + dissector_handle_t dissector_handle; + /* handle for protocol dissector client associated with circuit */ + guint options; /* wildcard flags */ + circuit_key *key_ptr; /* pointer to the key for this circuit */ +} circuit_t; + +extern void circuit_init(void); + +extern circuit_t *circuit_new(circuit_type ctype, guint32 circuit_id); + +extern circuit_t *find_circuit(circuit_type ctype, guint32 circuit_id); + +extern void circuit_add_proto_data(circuit_t *conv, int proto, + void *proto_data); +extern void *circuit_get_proto_data(circuit_t *conv, int proto); +extern void circuit_delete_proto_data(circuit_t *conv, int proto); + +extern void circuit_set_dissector(circuit_t *circuit, + dissector_handle_t handle); +extern gboolean +try_circuit_dissector(circuit_type ctype, guint32 circuit_id, tvbuff_t *tvb, + packet_info *pinfo, proto_tree *tree); + +#endif /* circuit.h */ + diff --git a/epan/epan.h b/epan/epan.h index 24b02a79a7..b3efd355cc 100644 --- a/epan/epan.h +++ b/epan/epan.h @@ -1,6 +1,6 @@ /* epan.h * - * $Id: epan.h,v 1.14 2002/09/09 21:04:06 guy Exp $ + * $Id: epan.h,v 1.15 2002/10/22 08:44:33 guy Exp $ * * Ethereal Protocol Analyzer Library * @@ -36,8 +36,7 @@ void epan_init(const char * plugindir, void (register_all_protocols)(void), void (register_all_handoffs)(void)); void epan_cleanup(void); void epan_conversation_init(void); - - +void epan_circuit_init(void); /* A client will create one epan_t for an entire dissection session. * A single epan_t will be used to analyze the entire sequence of packets, |