forked from osmocom/wireshark
![Dario Lombardo](/assets/img/avatar_default.png)
Change-Id: I92c94448e6641716d03158a5f332c8b53709423a Reviewed-on: https://code.wireshark.org/review/25756 Petri-Dish: Dario Lombardo <lomato@gmail.com> Reviewed-by: Anders Broman <a.broman58@gmail.com>
338 lines
11 KiB
C
338 lines
11 KiB
C
/* packet-bananna.c
|
|
* Routines for the Twisted Banana serialization protocol dissection
|
|
* Copyright 2009, Gerald Combs <gerald@wireshark.org>
|
|
*
|
|
* Wireshark - Network traffic analyzer
|
|
* By Gerald Combs <gerald@wireshark.org>
|
|
* Copyright 1998 Gerald Combs
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0-or-later
|
|
*/
|
|
|
|
/*
|
|
* Based on "Banana Protocol Specifications"
|
|
* http://twistedmatrix.com/projects/core/documentation/specifications/banana.html
|
|
*/
|
|
|
|
#include "config.h"
|
|
|
|
#include <epan/packet.h>
|
|
#include <epan/expert.h>
|
|
|
|
void proto_register_banana(void);
|
|
void proto_reg_handoff_banana(void);
|
|
|
|
/* Initialize the protocol and registered fields */
|
|
static int proto_banana = -1;
|
|
static int hf_banana_list = -1;
|
|
static int hf_banana_int = -1;
|
|
static int hf_banana_string = -1;
|
|
static int hf_banana_neg_int = -1;
|
|
static int hf_banana_float = -1;
|
|
static int hf_banana_lg_int = -1;
|
|
static int hf_banana_lg_neg_int = -1;
|
|
static int hf_banana_pb = -1;
|
|
|
|
/* Initialize the subtree pointers */
|
|
static gint ett_banana = -1;
|
|
static gint ett_list = -1;
|
|
|
|
static expert_field ei_banana_unknown_type = EI_INIT;
|
|
static expert_field ei_banana_too_many_value_bytes = EI_INIT;
|
|
static expert_field ei_banana_length_too_long = EI_INIT;
|
|
static expert_field ei_banana_value_too_large = EI_INIT;
|
|
static expert_field ei_banana_pb_error = EI_INIT;
|
|
|
|
static dissector_handle_t banana_handle;
|
|
|
|
#define BE_LIST 0x80
|
|
#define BE_INT 0x81
|
|
#define BE_STRING 0x82
|
|
#define BE_NEG_INT 0x83
|
|
#define BE_FLOAT 0x84
|
|
#define BE_LG_INT 0x85
|
|
#define BE_LG_NEG_INT 0x86
|
|
#define BE_PB 0x87
|
|
|
|
#define is_element(b) (b >= BE_LIST && b <= BE_PB)
|
|
|
|
static const value_string type_vals[] = {
|
|
{ BE_LIST, "List" },
|
|
{ BE_INT, "Integer" },
|
|
{ BE_STRING, "String" },
|
|
{ BE_NEG_INT, "Negative Integer" },
|
|
{ BE_FLOAT, "Float" },
|
|
{ BE_LG_INT, "Large Integer" },
|
|
{ BE_LG_NEG_INT, "Large Negative Integer" },
|
|
{ BE_PB, "pb Profile"},
|
|
{ 0, NULL }
|
|
};
|
|
|
|
static const value_string pb_vals[] = {
|
|
{ 0x01, "None" },
|
|
{ 0x02, "class" },
|
|
{ 0x03, "dereference" },
|
|
{ 0x04, "reference" },
|
|
{ 0x05, "dictionary" },
|
|
{ 0x06, "function" },
|
|
{ 0x07, "instance" },
|
|
{ 0x08, "list" },
|
|
{ 0x09, "module" },
|
|
{ 0x0a, "persistent" },
|
|
{ 0x0b, "tuple" },
|
|
{ 0x0c, "unpersistable" },
|
|
{ 0x0d, "copy" },
|
|
{ 0x0e, "cache" },
|
|
{ 0x0f, "cached" },
|
|
{ 0x10, "remote" },
|
|
{ 0x11, "local" },
|
|
{ 0x12, "lcache" },
|
|
{ 0x13, "version" },
|
|
{ 0x14, "login" },
|
|
{ 0x15, "password" },
|
|
{ 0x16, "challenge" },
|
|
{ 0x17, "logged_in" },
|
|
{ 0x18, "not_logged_in" },
|
|
{ 0x19, "cachemessage" },
|
|
{ 0x1a, "message" },
|
|
{ 0x1b, "answer" },
|
|
{ 0x1c, "error" },
|
|
{ 0x1d, "decref" },
|
|
{ 0x1e, "decache" },
|
|
{ 0x1f, "uncache" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
#define MAX_ELEMENT_VAL 2147483647 /* Max TE value */
|
|
#define MAX_ELEMENT_INT_LEN 4
|
|
#define MAX_ELEMENT_VAL_LEN 8
|
|
|
|
/* Dissect the packets */
|
|
|
|
static int
|
|
dissect_banana_element(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int offset) {
|
|
proto_item *ti;
|
|
proto_tree *list_tree;
|
|
guint8 byte = 0;
|
|
gint64 val = 0;
|
|
gint val_len = 0;
|
|
int start_offset = offset;
|
|
int old_offset;
|
|
int i;
|
|
|
|
/* Accumulate our value/length 'til we hit a valid type */
|
|
while (tvb_reported_length_remaining(tvb, offset) > 0) {
|
|
byte = tvb_get_guint8(tvb, offset);
|
|
offset++;
|
|
|
|
if (byte & 0x80) {
|
|
if (is_element(byte)) {
|
|
break;
|
|
} else {
|
|
expert_add_info_format(pinfo, NULL, &ei_banana_unknown_type, "Unknown type %u", byte);
|
|
}
|
|
} else {
|
|
val_len++;
|
|
if (val_len > MAX_ELEMENT_VAL_LEN) {
|
|
expert_add_info(pinfo, NULL, &ei_banana_too_many_value_bytes);
|
|
}
|
|
val += byte + (val << 7);
|
|
}
|
|
}
|
|
|
|
/* Type */
|
|
switch (byte) {
|
|
case BE_LIST:
|
|
if (val > MAX_ELEMENT_VAL) {
|
|
expert_add_info_format(pinfo, NULL, &ei_banana_length_too_long, "List length %" G_GINT64_MODIFIER "d longer than we can handle", val);
|
|
}
|
|
ti = proto_tree_add_uint_format_value(tree, hf_banana_list, tvb, start_offset, offset - start_offset - 1, (guint32) val, "(%d items)", (gint) val);
|
|
list_tree = proto_item_add_subtree(ti, ett_list);
|
|
for (i = 0; i < val; i++) {
|
|
old_offset = offset;
|
|
offset += dissect_banana_element(tvb, pinfo, list_tree, offset);
|
|
if (offset <= old_offset) {
|
|
return offset - start_offset;
|
|
}
|
|
}
|
|
break;
|
|
case BE_INT:
|
|
if (val > MAX_ELEMENT_VAL) {
|
|
expert_add_info_format(pinfo, NULL, &ei_banana_value_too_large, "Integer value %" G_GINT64_MODIFIER "d too large", val);
|
|
}
|
|
proto_tree_add_uint(tree, hf_banana_int, tvb, start_offset, offset - start_offset, (guint32) val);
|
|
break;
|
|
case BE_STRING:
|
|
if (val > MAX_ELEMENT_VAL) {
|
|
expert_add_info_format(pinfo, NULL, &ei_banana_length_too_long, "String length %" G_GINT64_MODIFIER "d longer than we can handle", val);
|
|
}
|
|
proto_tree_add_item(tree, hf_banana_string, tvb, offset, (guint32) val, ENC_ASCII|ENC_NA);
|
|
offset += (gint) val;
|
|
break;
|
|
case BE_NEG_INT:
|
|
if (val > MAX_ELEMENT_VAL) {
|
|
expert_add_info_format(pinfo, NULL, &ei_banana_value_too_large, "Integer value -%" G_GINT64_MODIFIER "d too large", val);
|
|
}
|
|
proto_tree_add_int(tree, hf_banana_neg_int, tvb, start_offset, offset - start_offset, (gint32) val * -1);
|
|
break;
|
|
case BE_FLOAT:
|
|
proto_tree_add_item(tree, hf_banana_float, tvb, offset, 8, ENC_BIG_ENDIAN);
|
|
offset += 8;
|
|
break;
|
|
case BE_LG_INT:
|
|
proto_tree_add_item(tree, hf_banana_lg_int, tvb, start_offset, offset - start_offset, ENC_NA);
|
|
break;
|
|
case BE_LG_NEG_INT:
|
|
proto_tree_add_item(tree, hf_banana_lg_neg_int, tvb, start_offset, offset - start_offset, ENC_NA);
|
|
break;
|
|
case BE_PB:
|
|
if (val_len > 1) {
|
|
expert_add_info(pinfo, NULL, &ei_banana_pb_error);
|
|
}
|
|
/*
|
|
* The spec says the pb dictionary value comes after the tag.
|
|
* In real-world captures it comes before.
|
|
*/
|
|
proto_tree_add_item(tree, hf_banana_pb, tvb, offset - 2, 1, ENC_BIG_ENDIAN);
|
|
break;
|
|
default:
|
|
return 0;
|
|
break;
|
|
}
|
|
return offset - start_offset;
|
|
}
|
|
|
|
static int
|
|
dissect_banana(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_) {
|
|
guint8 byte = 0;
|
|
gint offset = 0, old_offset;
|
|
proto_item *ti;
|
|
proto_tree *banana_tree;
|
|
|
|
/* Check that there's enough data */
|
|
if (tvb_reported_length(tvb) < 2)
|
|
return 0;
|
|
|
|
/* Fill in our protocol and info columns */
|
|
col_set_str(pinfo->cinfo, COL_PROTOCOL, "Banana");
|
|
|
|
while (tvb_reported_length_remaining(tvb, offset) > 0 && offset < MAX_ELEMENT_VAL_LEN) {
|
|
byte = tvb_get_guint8(tvb, offset);
|
|
if (is_element(byte))
|
|
break;
|
|
offset++;
|
|
}
|
|
col_add_fstr(pinfo->cinfo, COL_INFO, "First element: %s",
|
|
val_to_str(byte, type_vals, "Unknown type: %u"));
|
|
|
|
/* Create display subtree for the protocol */
|
|
ti = proto_tree_add_item(tree, proto_banana, tvb, 0, -1, ENC_NA);
|
|
banana_tree = proto_item_add_subtree(ti, ett_banana);
|
|
|
|
offset = 0;
|
|
old_offset = -1;
|
|
while (offset > old_offset) {
|
|
old_offset = offset;
|
|
offset += dissect_banana_element(tvb, pinfo, banana_tree, offset);
|
|
}
|
|
|
|
/* Return the amount of data this dissector was able to dissect */
|
|
return tvb_reported_length(tvb);
|
|
}
|
|
|
|
/* Register the protocol with Wireshark */
|
|
|
|
void
|
|
proto_register_banana(void)
|
|
{
|
|
static hf_register_info hf[] = {
|
|
{ &hf_banana_list,
|
|
{ "List Length", "banana.list",
|
|
FT_UINT32, BASE_DEC, NULL, 0,
|
|
"Banana list", HFILL }
|
|
},
|
|
{ &hf_banana_int,
|
|
{ "Integer", "banana.int",
|
|
FT_UINT32, BASE_DEC, NULL, 0,
|
|
"Banana integer", HFILL }
|
|
},
|
|
{ &hf_banana_string,
|
|
{ "String", "banana.string",
|
|
FT_STRING, BASE_NONE, NULL, 0,
|
|
"Banana string", HFILL }
|
|
},
|
|
{ &hf_banana_neg_int,
|
|
{ "Negative Integer", "banana.neg_int",
|
|
FT_INT32, BASE_DEC, NULL, 0,
|
|
"Banana negative integer", HFILL }
|
|
},
|
|
{ &hf_banana_float,
|
|
{ "Float", "banana.float",
|
|
FT_DOUBLE, BASE_NONE, NULL, 0,
|
|
"Banana float", HFILL }
|
|
},
|
|
{ &hf_banana_lg_int,
|
|
{ "Float", "banana.lg_int",
|
|
FT_BYTES, BASE_NONE, NULL, 0,
|
|
"Banana large integer", HFILL }
|
|
},
|
|
{ &hf_banana_lg_neg_int,
|
|
{ "Float", "banana.lg_neg_int",
|
|
FT_BYTES, BASE_NONE, NULL, 0,
|
|
"Banana large negative integer", HFILL }
|
|
},
|
|
{ &hf_banana_pb,
|
|
{ "pb Profile Value", "banana.pb",
|
|
FT_UINT8, BASE_HEX, VALS(pb_vals), 0,
|
|
"Banana Perspective Broker Profile Value", HFILL }
|
|
}
|
|
};
|
|
|
|
expert_module_t* expert_banana;
|
|
|
|
/* Setup protocol subtree array */
|
|
static gint *ett[] = {
|
|
&ett_banana,
|
|
&ett_list
|
|
};
|
|
|
|
static ei_register_info ei[] = {
|
|
{ &ei_banana_unknown_type, { "banana.unknown_type", PI_UNDECODED, PI_ERROR, "Unknown type", EXPFILL }},
|
|
{ &ei_banana_too_many_value_bytes, { "banana.too_many_value_bytes", PI_UNDECODED, PI_ERROR, "Too many value/length bytes", EXPFILL }},
|
|
{ &ei_banana_length_too_long, { "banana.length_too_long", PI_UNDECODED, PI_ERROR, "Length too long", EXPFILL }},
|
|
{ &ei_banana_value_too_large, { "banana.value_too_large", PI_MALFORMED, PI_ERROR, "Value too large", EXPFILL }},
|
|
{ &ei_banana_pb_error, { "banana.pb_error", PI_MALFORMED, PI_ERROR, "More than 1 byte before pb", EXPFILL }},
|
|
};
|
|
|
|
/* Register the protocol name and description */
|
|
proto_banana = proto_register_protocol("Twisted Banana", "Banana", "banana");
|
|
|
|
/* Required function calls to register the header fields and subtrees used */
|
|
proto_register_field_array(proto_banana, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
expert_banana = expert_register_protocol(proto_banana);
|
|
expert_register_field_array(expert_banana, ei, array_length(ei));
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_banana(void)
|
|
{
|
|
banana_handle = create_dissector_handle(dissect_banana, proto_banana);
|
|
dissector_add_uint_range_with_preference("tcp.port", "", banana_handle);
|
|
}
|
|
|
|
/*
|
|
* Editor modelines - http://www.wireshark.org/tools/modelines.html
|
|
*
|
|
* Local variables:
|
|
* c-basic-offset: 4
|
|
* tab-width: 8
|
|
* indent-tabs-mode: nil
|
|
* End:
|
|
*
|
|
* ex: set shiftwidth=4 tabstop=8 expandtab:
|
|
* :indentSize=4:tabSize=8:noTabs=true:
|
|
*/
|
|
|
|
|