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/* proto_data.c
* Protocol-specific data
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "config.h"
#include <glib.h>
#include <epan/wmem_scopes.h>
#include <epan/packet_info.h>
#include <epan/proto_data.h>
#include <epan/proto.h>
/* Protocol-specific data attached to a frame_data structure - protocol
index, key for multiple items with the same protocol index,
and opaque pointer. */
typedef struct _proto_data {
int proto;
guint32 key;
void *proto_data;
} proto_data_t;
static gint
p_compare(gconstpointer a, gconstpointer b)
{
const proto_data_t *ap = (const proto_data_t *)a;
const proto_data_t *bp = (const proto_data_t *)b;
if (ap -> proto > bp -> proto) {
return 1;
} else if (ap -> proto == bp -> proto) {
if (ap->key > bp->key){
return 1;
} else if (ap -> key == bp -> key) {
return 0;
}
return -1;
} else {
return -1;
}
}
void
p_add_proto_data(wmem_allocator_t *tmp_scope, struct _packet_info* pinfo, int proto, guint32 key, void *proto_data)
{
proto_data_t *p1;
GSList **proto_list;
wmem_allocator_t *scope;
if (tmp_scope == pinfo->pool) {
scope = tmp_scope;
proto_list = &pinfo->proto_data;
} else if (tmp_scope == wmem_file_scope()) {
scope = wmem_file_scope();
proto_list = &pinfo->fd->pfd;
} else {
DISSECTOR_ASSERT(!"invalid wmem scope");
}
p1 = wmem_new(scope, proto_data_t);
p1->proto = proto;
p1->key = key;
p1->proto_data = proto_data;
/* Add it to the GSLIST */
*proto_list = g_slist_prepend(*proto_list, p1);
}
void
p_set_proto_data(wmem_allocator_t *scope, struct _packet_info* pinfo, int proto, guint32 key, void *proto_data)
{
proto_data_t temp;
GSList *item;
temp.proto = proto;
temp.key = key;
temp.proto_data = NULL;
if (scope == pinfo->pool) {
item = g_slist_find_custom(pinfo->proto_data, &temp, p_compare);
} else if (scope == wmem_file_scope()) {
item = g_slist_find_custom(pinfo->fd->pfd, &temp, p_compare);
} else {
DISSECTOR_ASSERT(!"invalid wmem scope");
}
if (item) {
proto_data_t *pd = (proto_data_t *)item->data;
pd->proto_data = proto_data;
return;
}
p_add_proto_data(scope, pinfo, proto, key, proto_data);
}
void *
p_get_proto_data(wmem_allocator_t *scope, struct _packet_info* pinfo, int proto, guint32 key)
{
proto_data_t temp, *p1;
GSList *item;
temp.proto = proto;
temp.key = key;
temp.proto_data = NULL;
if (scope == pinfo->pool) {
item = g_slist_find_custom(pinfo->proto_data, &temp, p_compare);
} else if (scope == wmem_file_scope()) {
item = g_slist_find_custom(pinfo->fd->pfd, &temp, p_compare);
} else {
DISSECTOR_ASSERT(!"invalid wmem scope");
}
if (item) {
p1 = (proto_data_t *)item->data;
return p1->proto_data;
}
return NULL;
}
void
p_remove_proto_data(wmem_allocator_t *scope, struct _packet_info* pinfo, int proto, guint32 key)
{
proto_data_t temp;
GSList *item;
GSList **proto_list;
temp.proto = proto;
temp.key = key;
temp.proto_data = NULL;
if (scope == pinfo->pool) {
item = g_slist_find_custom(pinfo->proto_data, &temp, p_compare);
proto_list = &pinfo->proto_data;
} else if (scope == wmem_file_scope()) {
item = g_slist_find_custom(pinfo->fd->pfd, &temp, p_compare);
proto_list = &pinfo->fd->pfd;
} else {
DISSECTOR_ASSERT(!"invalid wmem scope");
}
if (item) {
*proto_list = g_slist_remove(*proto_list, item->data);
}
}
gchar *
p_get_proto_name_and_key(wmem_allocator_t *scope, struct _packet_info* pinfo, guint pfd_index){
proto_data_t *temp;
if (scope == pinfo->pool) {
temp = (proto_data_t *)g_slist_nth_data(pinfo->proto_data, pfd_index);
} else if (scope == wmem_file_scope()) {
temp = (proto_data_t *)g_slist_nth_data(pinfo->fd->pfd, pfd_index);
} else {
DISSECTOR_ASSERT(!"invalid wmem scope");
}
return wmem_strdup_printf(pinfo->pool, "[%s, key %u]",proto_get_protocol_name(temp->proto), temp->key);
}
#define PROTO_DEPTH_KEY 0x3c233fb5 // printf "0x%02x%02x\n" ${RANDOM} ${RANDOM}
void p_set_proto_depth(struct _packet_info *pinfo, int proto, unsigned depth) {
p_set_proto_data(pinfo->pool, pinfo, proto, PROTO_DEPTH_KEY, GUINT_TO_POINTER(depth));
}
unsigned p_get_proto_depth(struct _packet_info *pinfo, int proto) {
return GPOINTER_TO_UINT(p_get_proto_data(pinfo->pool, pinfo, proto, PROTO_DEPTH_KEY));
}
/*
* Editor modelines - https://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 2
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* vi: set shiftwidth=2 tabstop=8 expandtab:
* :indentSize=2:tabSize=8:noTabs=true:
*/
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