![Bill Meier](/assets/img/avatar_default.png)
https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=4422 From me: Fix a number of instances where the function prototype or the function definition wasn't changed so there was a mismatch thus causing Windows (but not gcc) compilation errors. svn path=/trunk/; revision=32365
323 lines
12 KiB
C
323 lines
12 KiB
C
/* reassemble.h
|
|
* Declarations of outines for {fragment,segment} reassembly
|
|
*
|
|
* $Id$
|
|
*
|
|
* Wireshark - Network traffic analyzer
|
|
* By Gerald Combs <gerald@wireshark.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.
|
|
*/
|
|
|
|
/* make sure that all flags that are set in a fragment entry is also set for
|
|
* the flags field of fd_head !!!
|
|
*/
|
|
|
|
/* only in fd_head: packet is defragmented */
|
|
#define FD_DEFRAGMENTED 0x0001
|
|
|
|
/* there are overlapping fragments */
|
|
#define FD_OVERLAP 0x0002
|
|
|
|
/* overlapping fragments contain different data */
|
|
#define FD_OVERLAPCONFLICT 0x0004
|
|
|
|
/* more than one fragment which indicates end-of data */
|
|
#define FD_MULTIPLETAILS 0x0008
|
|
|
|
/* fragment contains data past the end of the datagram */
|
|
#define FD_TOOLONGFRAGMENT 0x0010
|
|
|
|
/* fragment data not alloc'ed, fd->data pointing to fd_head->data+fd->offset */
|
|
#define FD_NOT_MALLOCED 0x0020
|
|
|
|
/* this flag is used to request fragment_add to continue the reassembly process */
|
|
#define FD_PARTIAL_REASSEMBLY 0x0040
|
|
|
|
/* fragment offset is indicated by sequence number and not byte offset
|
|
into the defragmented packet */
|
|
#define FD_BLOCKSEQUENCE 0x0100
|
|
|
|
/* if REASSEMBLE_FLAGS_CHECK_DATA_PRESENT is set, and the first fragment is
|
|
* incomplete, this flag is set in the flags word on the fd_head returned.
|
|
*
|
|
* It's all a fudge to preserve historical behaviour.
|
|
*/
|
|
#define FD_DATA_NOT_PRESENT 0x0200
|
|
|
|
/* This flag is set in (only) fd_head to denote that datalen has been set to a valid value.
|
|
* It's implied by FD_DEFRAGMENTED (we must know the total length of the
|
|
* datagram if we have defragmented it...)
|
|
*/
|
|
#define FD_DATALEN_SET 0x0400
|
|
|
|
typedef struct _fragment_data {
|
|
struct _fragment_data *next;
|
|
guint32 frame;
|
|
guint32 offset;
|
|
guint32 len;
|
|
guint32 datalen; /* Only valid in first item of list and when
|
|
* flags&FD_DATALEN_SET is set;
|
|
* number of bytes or (if flags&FD_BLOCKSEQUENCE set)
|
|
* segments in the datagram */
|
|
guint32 reassembled_in; /* frame where this PDU was reassembled,
|
|
only valid in the first item of the list
|
|
and when FD_DEFRAGMENTED is set*/
|
|
guint32 flags;
|
|
unsigned char *data;
|
|
} fragment_data;
|
|
|
|
|
|
/*
|
|
* Flags for fragment_add_seq_*
|
|
*/
|
|
|
|
/* we don't have any sequence numbers - fragments are assumed to appear in
|
|
* order */
|
|
#define REASSEMBLE_FLAGS_NO_FRAG_NUMBER 0x0001
|
|
|
|
/* a special fudge for the 802.11 dissector */
|
|
#define REASSEMBLE_FLAGS_802_11_HACK 0x0002
|
|
|
|
/* causes fragment_add_seq_key to check that all the fragment data is present
|
|
* in the tvb, and if not, do something a bit odd. */
|
|
#define REASSEMBLE_FLAGS_CHECK_DATA_PRESENT 0x0004
|
|
|
|
/* a function for copying hash keys */
|
|
typedef void *(*fragment_key_copier)(const void *key);
|
|
|
|
|
|
/*
|
|
* Initialize a fragment table.
|
|
*/
|
|
extern void fragment_table_init(GHashTable **fragment_table);
|
|
extern void dcerpc_fragment_table_init(GHashTable **fragment_table);
|
|
|
|
/*
|
|
* Initialize a reassembled-packet table.
|
|
*/
|
|
extern void reassembled_table_init(GHashTable **reassembled_table);
|
|
|
|
/*
|
|
* Free up all space allocated for fragment keys and data.
|
|
*/
|
|
void reassemble_cleanup(void);
|
|
|
|
/*
|
|
* Initialise fragment keys and data.
|
|
*/
|
|
void reassemble_init(void);
|
|
|
|
/*
|
|
* This function adds a new fragment to the fragment hash table.
|
|
* If this is the first fragment seen for this datagram, a new entry
|
|
* is created in the hash table, otherwise this fragment is just added
|
|
* to the linked list of fragments for this packet.
|
|
* The list of fragments for a specific datagram is kept sorted for
|
|
* easier handling.
|
|
*
|
|
* Returns a pointer to the head of the fragment data list if we have all the
|
|
* fragments, NULL otherwise.
|
|
*/
|
|
extern fragment_data *fragment_add(tvbuff_t *tvb, const int offset, const packet_info *pinfo,
|
|
const guint32 id, GHashTable *fragment_table, const guint32 frag_offset,
|
|
guint32 const frag_data_len, const gboolean more_frags);
|
|
extern fragment_data *fragment_add_multiple_ok(tvbuff_t *tvb, const int offset,
|
|
const packet_info *pinfo, const guint32 id, GHashTable *fragment_table,
|
|
const guint32 frag_offset, const guint32 frag_data_len, const gboolean more_frags);
|
|
|
|
/*
|
|
* This routine extends fragment_add to use a "reassembled_table".
|
|
*
|
|
* If, after processing this fragment, we have all the fragments, they
|
|
* remove that from the fragment hash table if necessary and add it
|
|
* to the table of reassembled fragments, and return a pointer to the
|
|
* head of the fragment list.
|
|
*/
|
|
extern fragment_data *fragment_add_check(tvbuff_t *tvb, const int offset,
|
|
const packet_info *pinfo, const guint32 id, GHashTable *fragment_table,
|
|
GHashTable *reassembled_table, const guint32 frag_offset,
|
|
const guint32 frag_data_len, const gboolean more_frags);
|
|
|
|
/* same as fragment_add() but this one assumes frag_number is a block
|
|
sequence number. note that frag_number is 0 for the first fragment. */
|
|
|
|
/*
|
|
* These functions add a new fragment to the fragment hash table,
|
|
* assuming that frag_number is a block sequence number (starting from zero for
|
|
* the first fragment of each datagram).
|
|
*
|
|
* If this is the first fragment seen for this datagram, a new
|
|
* "fragment_data" structure is allocated to refer to the reassembled
|
|
* packet, and:
|
|
*
|
|
* if "more_frags" is false, and either we have no sequence numbers, or
|
|
* are using the 802.11 hack, it is assumed that this is the only fragment
|
|
* in the datagram. The structure is not added to the hash
|
|
* table, and not given any fragments to refer to, but is just returned.
|
|
*
|
|
* In this latter case reassembly wasn't done (since there was only one
|
|
* fragment in the packet); dissectors can check the 'next' pointer on the
|
|
* returned list to see if this case was hit or not.
|
|
*
|
|
* Otherwise, this fragment is just added to the linked list of fragments
|
|
* for this packet; the fragment_data is also added to the fragment hash if
|
|
* necessary.
|
|
*
|
|
* If this packet completes assembly, these functions return the head of the
|
|
* fragment data; otherwise, they return null.
|
|
*/
|
|
|
|
/* "key" should be an arbitrary key used for indexing the fragment hash;
|
|
* "key_copier" is called to copy the key to a more appropriate store before
|
|
* inserting a new entry to the hash.
|
|
*/
|
|
extern fragment_data *
|
|
fragment_add_seq_key(tvbuff_t *tvb, const int offset, const packet_info *pinfo,
|
|
void *key, fragment_key_copier key_copier,
|
|
GHashTable *fragment_table, guint32 frag_number,
|
|
const guint32 frag_data_len, const gboolean more_frags,
|
|
const guint32 flags);
|
|
|
|
/* a wrapper for fragment_add_seq_key - uses a key of source, dest and id */
|
|
extern fragment_data *fragment_add_seq(tvbuff_t *tvb, const int offset, const packet_info *pinfo,
|
|
const guint32 id, GHashTable *fragment_table, const guint32 frag_number,
|
|
const guint32 frag_data_len, const gboolean more_frags);
|
|
|
|
/* another wrapper for fragment_add_seq_key - uses a key of source, dest, id
|
|
* and act_id */
|
|
extern fragment_data *
|
|
fragment_add_dcerpc_dg(tvbuff_t *tvb, const int offset, const packet_info *pinfo, const guint32 id,
|
|
void *act_id,
|
|
GHashTable *fragment_table, const guint32 frag_number,
|
|
const guint32 frag_data_len, const gboolean more_frags);
|
|
|
|
/*
|
|
* These routines extend fragment_add_seq_key to use a "reassembled_table".
|
|
*
|
|
* If, after processing this fragment, we have all the fragments, they
|
|
* remove that from the fragment hash table if necessary and add it
|
|
* to the table of reassembled fragments, and return a pointer to the
|
|
* head of the fragment list.
|
|
*/
|
|
extern fragment_data *
|
|
fragment_add_seq_check(tvbuff_t *tvb, const int offset, const packet_info *pinfo,
|
|
const guint32 id, GHashTable *fragment_table,
|
|
GHashTable *reassembled_table, const guint32 frag_number,
|
|
const guint32 frag_data_len, const gboolean more_frags);
|
|
|
|
extern fragment_data *
|
|
fragment_add_seq_802_11(tvbuff_t *tvb, int offset, packet_info *pinfo,
|
|
guint32 id, GHashTable *fragment_table,
|
|
GHashTable *reassembled_table, guint32 frag_number,
|
|
guint32 frag_data_len, gboolean more_frags);
|
|
|
|
extern fragment_data *
|
|
fragment_add_seq_next(tvbuff_t *tvb, int offset, packet_info *pinfo, guint32 id,
|
|
GHashTable *fragment_table, GHashTable *reassembled_table,
|
|
guint32 frag_data_len, gboolean more_frags);
|
|
|
|
extern void
|
|
fragment_start_seq_check(const packet_info *pinfo, const guint32 id, GHashTable *fragment_table,
|
|
const guint32 tot_len);
|
|
|
|
extern fragment_data *
|
|
fragment_end_seq_next(const packet_info *pinfo, const guint32 id, GHashTable *fragment_table,
|
|
GHashTable *reassembled_table);
|
|
/* to specify how much to reassemble, for fragmentation where last fragment can not be
|
|
* identified by flags or such.
|
|
* note that for FD_BLOCKSEQUENCE tot_len is the index for the tail fragment.
|
|
* i.e. since the block numbers start at 0, if we specify tot_len==2, that
|
|
* actually means we want to defragment 3 blocks, block 0, 1 and 2.
|
|
*
|
|
*/
|
|
extern void
|
|
fragment_set_tot_len(const packet_info *pinfo, const guint32 id, GHashTable *fragment_table,
|
|
const guint32 tot_len);
|
|
|
|
/* to resad whatever totlen previously set */
|
|
extern guint32
|
|
fragment_get_tot_len(const packet_info *pinfo, const guint32 id, GHashTable *fragment_table);
|
|
|
|
/*
|
|
* This function will set the partial reassembly flag(FD_PARTIAL_REASSEMBLY) for a fh.
|
|
* When this function is called, the fh MUST already exist, i.e.
|
|
* the fh MUST be created by the initial call to fragment_add() before
|
|
* this function is called. Also note that this function MUST be called to indicate
|
|
* a fh will be extended (increase the already stored data). After calling this function,
|
|
* and if FD_DEFRAGMENTED is set, the reassembly process will be continued.
|
|
*/
|
|
extern void
|
|
fragment_set_partial_reassembly(const packet_info *pinfo, const guint32 id, GHashTable *fragment_table);
|
|
|
|
/* This function is used to check if there is partial or completed reassembly state
|
|
* matching this packet. I.e. Are there reassembly going on or not for this packet?
|
|
*/
|
|
extern fragment_data *
|
|
fragment_get(const packet_info *pinfo, const guint32 id, GHashTable *fragment_table);
|
|
|
|
/* The same for the reassemble table */
|
|
/* id *must* be the frame number for this to work! */
|
|
extern fragment_data *
|
|
fragment_get_reassembled(const guint32 id, GHashTable *reassembled_table);
|
|
|
|
extern fragment_data *
|
|
fragment_get_reassembled_id(const packet_info *pinfo, const guint32 id, GHashTable *reassembled_table);
|
|
|
|
/* This will free up all resources and delete reassembly state for this PDU.
|
|
* Except if the PDU is completely reassembled, then it would NOT deallocate the
|
|
* buffer holding the reassembled data but instead return the pointer to that
|
|
* buffer.
|
|
*
|
|
* So, if you call fragment_delete and it returns non-NULL, YOU are responsible to
|
|
* g_free() that buffer.
|
|
*/
|
|
extern unsigned char *
|
|
fragment_delete(const packet_info *pinfo, const guint32 id, GHashTable *fragment_table);
|
|
|
|
/* hf_fragment, hf_fragment_error, and hf_reassembled_in should be
|
|
FT_FRAMENUM, the others should be FT_BOOLEAN
|
|
*/
|
|
typedef struct _fragment_items {
|
|
gint *ett_fragment;
|
|
gint *ett_fragments;
|
|
|
|
int *hf_fragments;
|
|
int *hf_fragment;
|
|
int *hf_fragment_overlap;
|
|
int *hf_fragment_overlap_conflict;
|
|
int *hf_fragment_multiple_tails;
|
|
int *hf_fragment_too_long_fragment;
|
|
int *hf_fragment_error;
|
|
int *hf_reassembled_in;
|
|
int *hf_reassembled_length;
|
|
|
|
const char *tag;
|
|
} fragment_items;
|
|
|
|
extern tvbuff_t *
|
|
process_reassembled_data(tvbuff_t *tvb, const int offset, packet_info *pinfo,
|
|
const char *name, fragment_data *fd_head, const fragment_items *fit,
|
|
gboolean *update_col_infop, proto_tree *tree);
|
|
|
|
extern gboolean
|
|
show_fragment_tree(fragment_data *ipfd_head, const fragment_items *fit,
|
|
proto_tree *tree, packet_info *pinfo, tvbuff_t *tvb, proto_item **fi);
|
|
|
|
extern gboolean
|
|
show_fragment_seq_tree(fragment_data *ipfd_head, const fragment_items *fit,
|
|
proto_tree *tree, packet_info *pinfo, tvbuff_t *tvb, proto_item **fi);
|