forked from osmocom/wireshark
![Jeff Morriss](/assets/img/avatar_default.png)
callers use that instead of initializing each allocator individually. svn path=/trunk/; revision=30646
497 lines
17 KiB
C
497 lines
17 KiB
C
/* emem.h
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* Definitions for Wireshark memory management and garbage collection
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* Ronnie Sahlberg 2005
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*
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* $Id$
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifndef __EMEM_H__
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#define __EMEM_H__
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#include "gnuc_format_check.h"
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/* Initialize all the memory allocation pools described below.
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* This function must be called once when *shark initialize to set up the
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* required structures.
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*/
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void emem_init(void);
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/* Functions for handling memory allocation and garbage collection with
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* a packet lifetime scope.
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* These functions are used to allocate memory that will only remain persistent
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* until Wireshark starts dissecting the next packet in the list.
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* Everytime Wireshark starts decoding the next packet all memory allocated
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* through these functions will be released back to the free pool.
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*
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* These functions are very fast and offer automatic garbage collection:
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* Everytime a new packet is dissected, all memory allocations done in
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* the previous packet is freed.
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*/
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/* Allocate memory with a packet lifetime scope */
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void *ep_alloc(size_t size);
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#define ep_new(type) ((type*)ep_alloc(sizeof(type)))
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/* Allocate memory with a packet lifetime scope and fill it with zeros*/
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void* ep_alloc0(size_t size);
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#define ep_new0(type) ((type*)ep_alloc0(sizeof(type)))
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/* Duplicate a string with a packet lifetime scope */
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gchar* ep_strdup(const gchar* src);
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/* Duplicate at most n characters of a string with a packet lifetime scope */
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gchar* ep_strndup(const gchar* src, size_t len);
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/* Duplicate a buffer with a packet lifetime scope */
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void* ep_memdup(const void* src, size_t len);
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/* Create a formatted string with a packet lifetime scope */
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gchar* ep_strdup_vprintf(const gchar* fmt, va_list ap);
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gchar* ep_strdup_printf(const gchar* fmt, ...)
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GNUC_FORMAT_CHECK(printf, 1, 2);
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/* allocates with a packet lifetime scope an array of type made of num elements */
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#define ep_alloc_array(type,num) (type*)ep_alloc(sizeof(type)*(num))
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/* allocates with a packet lifetime scope an array of type made of num elements,
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* initialised to zero.
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*/
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#define ep_alloc_array0(type,num) (type*)ep_alloc0(sizeof(type)*(num))
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/*
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* Splits a string into a maximum of max_tokens pieces, using the given
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* delimiter. If max_tokens is reached, the remainder of string is appended
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* to the last token. Consecutive delimiters are treated as a single delimiter.
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*
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* the vector and all the strings are allocated with packet lifetime scope
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*/
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gchar** ep_strsplit(const gchar* string, const gchar* delimiter, int max_tokens);
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/* release all memory allocated in the previous packet dissector */
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void ep_free_all(void);
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/* a stack implemented using ephemeral allocators */
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typedef struct _ep_stack_frame_t** ep_stack_t;
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struct _ep_stack_frame_t {
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void* payload;
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struct _ep_stack_frame_t* below;
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struct _ep_stack_frame_t* above;
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};
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/*
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* creates an empty stack with a packet lifetime scope
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*/
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ep_stack_t ep_stack_new(void);
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/*
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* pushes item into stack, returns item
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*/
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void* ep_stack_push(ep_stack_t stack, void* item);
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/*
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* pops an item from the stack
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*/
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void* ep_stack_pop(ep_stack_t stack);
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/*
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* returns the item on top of the stack without popping it
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*/
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#define ep_stack_peek(stack) ((*(stack))->payload)
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/* Functions for handling memory allocation and garbage collection with
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* a capture lifetime scope.
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* These functions are used to allocate memory that will only remain persistent
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* until Wireshark opens a new capture or capture file.
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* Everytime Wireshark starts a new capture or opens a new capture file
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* all the data allocated through these functions will be released back
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* to the free pool.
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*
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* These functions are very fast and offer automatic garbage collection.
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*/
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/* Allocate memory with a capture lifetime scope */
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void *se_alloc(size_t size);
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/* Allocate memory with a capture lifetime scope and fill it with zeros*/
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void* se_alloc0(size_t size);
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/* Duplicate a string with a capture lifetime scope */
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gchar* se_strdup(const gchar* src);
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/* Duplicate at most n characters of a string with a capture lifetime scope */
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gchar* se_strndup(const gchar* src, size_t len);
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/* Duplicate a buffer with a capture lifetime scope */
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void* se_memdup(const void* src, size_t len);
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/* Create a formatted string with a capture lifetime scope */
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gchar* se_strdup_vprintf(const gchar* fmt, va_list ap);
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gchar* se_strdup_printf(const gchar* fmt, ...)
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GNUC_FORMAT_CHECK(printf, 1, 2);
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/* allocates with a capture lifetime scope an array of type made of num elements */
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#define se_alloc_array(type,num) (type*)se_alloc(sizeof(type)*(num))
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/* release all memory allocated */
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void se_free_all(void);
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/**************************************************************
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* binary trees
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**************************************************************/
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typedef struct _emem_tree_node_t {
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struct _emem_tree_node_t *parent;
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struct _emem_tree_node_t *left;
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struct _emem_tree_node_t *right;
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struct {
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#define EMEM_TREE_RB_COLOR_RED 0
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#define EMEM_TREE_RB_COLOR_BLACK 1
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guint32 rb_color:1;
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#define EMEM_TREE_NODE_IS_DATA 0
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#define EMEM_TREE_NODE_IS_SUBTREE 1
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guint32 is_subtree:1;
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} u;
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guint32 key32;
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void *data;
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} emem_tree_node_t;
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/* Right now we only do basic red/black trees but in the future we might want
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* to try something different, such as a tree where each node keeps track
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* of how many times it has been looked up, and letting often looked up
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* nodes bubble upwards in the tree using rotate_right/left.
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* That would probably be good for things like nfs filehandles
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*/
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#define EMEM_TREE_TYPE_RED_BLACK 1
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typedef struct _emem_tree_t {
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struct _emem_tree_t *next;
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int type;
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const char *name; /* just a string to make debugging easier */
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emem_tree_node_t *tree;
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void *(*malloc)(size_t);
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} emem_tree_t;
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/* *******************************************************************
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* Tree functions for SE memory allocation scope
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* ******************************************************************* */
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/* This function is used to create a se based tree with monitoring.
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* When the SE heap is released back to the system the pointer to the
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* tree is automatically reset to NULL.
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*
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* type is : EMEM_TREE_TYPE_RED_BLACK for a standard red/black tree.
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*/
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emem_tree_t *se_tree_create(int type, const char *name);
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/* This function is similar to the se_tree_create() call but with the
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* difference that when the se memory is release everything including the
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* pointer to the tree itself will be released.
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* This tree will not be just reset to zero it will be completely forgotten
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* by the allocator.
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* Use this function for when you want to store the pointer to a tree inside
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* another structure that is also se allocated so that when the structure is
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* released, the tree will be completely released as well.
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*/
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emem_tree_t *se_tree_create_non_persistent(int type, const char *name);
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/* se_tree_insert32
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* Insert data into the tree and key it by a 32bit integer value
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*/
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#define se_tree_insert32 emem_tree_insert32
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/* se_tree_lookup32
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* Retrieve the data at the search key. the search key is a 32bit integer value
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*/
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#define se_tree_lookup32 emem_tree_lookup32
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/* se_tree_lookup32_le
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* Retrieve the data for the largest key that is less than or equal
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* to the search key.
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*/
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#define se_tree_lookup32_le emem_tree_lookup32_le
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/* se_tree_insert32_array
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* Insert data into the tree and key it by a 32bit integer value
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*/
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#define se_tree_insert32_array emem_tree_insert32_array
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/* se_tree_lookup32_array
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* Lookup data from the tree that is index by an array
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*/
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#define se_tree_lookup32_array emem_tree_lookup32_array
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/* Create a new string based hash table */
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#define se_tree_create_string() se_tree_create(SE_TREE_TYPE_RED_BLACK)
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/* Insert a new value under a string key */
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#define se_tree_insert_string emem_tree_insert_string
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/* Lookup the value under a string key */
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#define se_tree_lookup_string emem_tree_lookup_string
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/* Traverse a tree */
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#define se_tree_foreach emem_tree_foreach
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/* *******************************************************************
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* Tree functions for PE memory allocation scope
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* ******************************************************************* */
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/* These trees have PErmanent allocation scope and will never be released
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*/
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emem_tree_t *pe_tree_create(int type, const char *name);
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#define pe_tree_insert32 emem_tree_insert32
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#define pe_tree_lookup32 emem_tree_lookup32
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#define pe_tree_lookup32_le emem_tree_lookup32_le
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#define pe_tree_insert32_array emem_tree_insert32_array
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#define pe_tree_lookup32_array emem_tree_lookup32_array
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#define pe_tree_insert_string emem_tree_insert_string
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#define pe_tree_lookup_string emem_tree_lookup_string
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#define pe_tree_foreach emem_tree_foreach
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/* ******************************************************************
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* Real tree functions
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* ****************************************************************** */
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/* This function is used to insert a node indexed by a guint32 key value.
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* The data pointer should be allocated by the appropriate storage scope
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* so that it will be released at the same time as the tree itself is
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* destroyed.
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*/
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void emem_tree_insert32(emem_tree_t *se_tree, guint32 key, void *data);
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/* This function will look up a node in the tree indexed by a guint32 integer
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* value.
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*/
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void *emem_tree_lookup32(emem_tree_t *se_tree, guint32 key);
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/* This function will look up a node in the tree indexed by a guint32 integer
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* value.
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* The function will return the node that has the largest key that is
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* equal to or smaller than the search key, or NULL if no such key was
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* found.
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*/
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void *emem_tree_lookup32_le(emem_tree_t *se_tree, guint32 key);
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typedef struct _emem_tree_key_t {
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guint32 length; /*length in guint32 words */
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guint32 *key;
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} emem_tree_key_t;
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/* This function is used to insert a node indexed by a sequence of guint32
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* key values.
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* The data pointer should be allocated by SE allocators so that the
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* data will be released at the same time as the tree itself is destroyed.
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*
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* Note: all the "key" members of the "key" argument MUST be aligned on
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* 32-bit boundaries; otherwise, this code will crash on platforms such
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* as SPARC that require aligned pointers.
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*
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* If you use ...32_array() calls you MUST make sure that every single node
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* you add to a specific tree always has a key of exactly the same number of
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* keylen words or things will most likely crash. Or at least that every single
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* item that sits behind the same top level node always have exactly the same
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* number of words.
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*
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* One way to guarantee this is the way that NFS does this for the
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* nfs_name_snoop_known tree which holds filehandles for both v2 and v3.
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* v2 filehandles are always 32 bytes (8 words) while v3 filehandles can have
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* any length (though 32bytes are most common).
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* The NFS dissector handles this by providing a guint32 containing the length
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* as the very first item in this vector :
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*
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* emem_tree_key_t fhkey[3];
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*
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* fhlen=nns->fh_length;
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* fhkey[0].length=1;
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* fhkey[0].key=&fhlen;
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* fhkey[1].length=fhlen/4;
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* fhkey[1].key=nns->fh;
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* fhkey[2].length=0;
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*/
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void emem_tree_insert32_array(emem_tree_t *se_tree, emem_tree_key_t *key, void *data);
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/* This function will look up a node in the tree indexed by a sequence of
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* guint32 integer values.
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*/
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void *emem_tree_lookup32_array(emem_tree_t *se_tree, emem_tree_key_t *key);
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/* case insensitive strings as keys */
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#define EMEM_TREE_STRING_NOCASE 0x00000001
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/* Insert a new value under a string key */
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void emem_tree_insert_string(emem_tree_t* h, const gchar* k, void* v, guint32 flags);
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/* Lookup the value under a string key */
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void* emem_tree_lookup_string(emem_tree_t* h, const gchar* k, guint32 flags);
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/* traverse a tree. if the callback returns TRUE the traversal will end */
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typedef gboolean (*tree_foreach_func)(void *value, void *userdata);
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gboolean emem_tree_foreach(emem_tree_t* emem_tree, tree_foreach_func callback, void *user_data);
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/* ******************************************************************
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* String buffers - Growable strings similar to GStrings
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* ****************************************************************** */
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typedef struct _emem_strbuf_t {
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gchar *str; /* points to the character data. It may move as text is */
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/* added. The str field is nul-terminated and so can */
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/* be used as an ordinary C string. */
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gsize len; /* strlen: ie: length of str not including trailing '\0' */
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gsize alloc_len; /* num bytes curently allocated for str: 1 .. MAX_STRBUF_LEN */
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gsize max_alloc_len; /* max num bytes to allocate for str: 1 .. MAX_STRBUF_LEN */
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} emem_strbuf_t;
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/*
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* The maximum length is limited to 64K. If you need something bigger, you
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* should probably use an actual GString or GByteArray.
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*/
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/**
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* Allocate an ephemeral string buffer with "unlimited" size.
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*
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* @param init The initial string for the buffer, or NULL to allocate an initial zero-length string.
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*
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* @return A newly-allocated string buffer.
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*/
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emem_strbuf_t *ep_strbuf_new(const gchar *init);
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/**
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* Allocate an ephemeral string buffer suitable for the protocol tree.
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* The string will never grow beyond the maximum tree item length.
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*
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* @param init The initial string for the buffer, or NULL to allocate an initial zero-length string.
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*
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* @return A newly-allocated string buffer.
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*/
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emem_strbuf_t *ep_strbuf_new_label(const gchar *init);
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/**
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* Allocate an ephemeral string buffer with enough initial space for @alloc_len bytes
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* and a maximum of @max_alloc_len bytes.
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*
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* @param alloc_len The initial size of the buffer. This value can be 0, but a nonzero
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* value is recommended.
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* @param max_alloc_len The maximum size of the buffer. 0 means "unlimited" (within
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* reason).
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*
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* @return A newly-allocated string buffer. @str will be empty.
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*/
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emem_strbuf_t *ep_strbuf_sized_new(gsize alloc_len, gsize max_alloc_len);
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/**
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* Append vprintf-style formatted text to a string buffer.
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*
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* @param strbuf The ep_strbuf-allocated string buffer to append to.
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* @param format A printf-style string format.
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* @param args The list of arguments to append.
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*/
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void ep_strbuf_append_vprintf(emem_strbuf_t *strbuf, const gchar *format, va_list ap);
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/**
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* Apply printf-style formatted text to a string buffer.
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*
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* @param strbuf The ep_strbuf-allocated string buffer to set to.
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* @param format A printf-style string format.
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*/
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void ep_strbuf_printf(emem_strbuf_t *strbuf, const gchar *format, ...)
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GNUC_FORMAT_CHECK(printf, 2, 3);
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/**
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* Append printf-style formatted text to a string buffer.
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*
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* @param strbuf The ep_strbuf-allocated string buffer to append to.
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* @param format A printf-style string format.
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*/
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void ep_strbuf_append_printf(emem_strbuf_t *strbuf, const gchar *format, ...)
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GNUC_FORMAT_CHECK(printf, 2, 3);
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/**
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* Append a string to a string buffer.
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*
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* @param strbuf The ep_strbuf-allocated string buffer to append to.
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* @param str A null-terminated string.
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*
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* @return strbuf
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*/
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emem_strbuf_t *ep_strbuf_append(emem_strbuf_t *strbuf, const gchar *str);
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/**
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* Append a character to a string buffer.
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*
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* @param strbuf The ep_strbuf-allocated string buffer to append to.
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* @param c The character to append.
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*
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* @return strbuf
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*/
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emem_strbuf_t *ep_strbuf_append_c(emem_strbuf_t *strbuf, const gchar c);
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/**
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* Chop off the end of a string buffer.
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*
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* @param strbuf The ep_strbuf-allocated string buffer to append to.
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* @param len The new string length.
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*
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* @return strbuf
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*/
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emem_strbuf_t *ep_strbuf_truncate(emem_strbuf_t *strbuf, gsize len);
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void emem_print_tree(emem_tree_t* emem_tree);
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/* #define DEBUG_INTENSE_CANARY_CHECKS */
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/* Helper to troubleshoot ep memory corruption
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* if compiled and the environment variable WIRESHARK_DEBUG_EP_INTENSE_CANARY exists
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* it will check the canaries and when found corrupt stop there in the hope
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* the corruptor is still there in the stack.
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* Some checkpoints are already set in packet.c in strategic points
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* before and after dissection of a frame or a dissector call.
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*/
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#ifdef DEBUG_INTENSE_CANARY_CHECKS
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void ep_check_canary_integrity(const char* fmt, ...)
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GNUC_FORMAT_CHECK(printf, 1, 2);
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#define EP_CHECK_CANARY(args) ep_check_canary_integrity args
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#else
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#define EP_CHECK_CANARY(args)
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#endif
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/**
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* Verify that the given pointer is of ephemeral/seasonal type.
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*
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* @param ptr The pointer to verify
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*
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* @return TRUE if the pointer belongs to the ephemeral/seasonal pool.
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|
*/
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gboolean ep_verify_pointer(const void *ptr);
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gboolean se_verify_pointer(const void *ptr);
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#endif /* emem.h */
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