608 lines
18 KiB
C
608 lines
18 KiB
C
/* packet-json.c
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* Routines for JSON dissection
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* References:
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* RFC 4627: http://tools.ietf.org/html/rfc4627
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* Website: http://json.org/
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*
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* Copyright 2010, Jakub Zawadzki <darkjames-ws@darkjames.pl>
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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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#define NEW_PROTO_TREE_API
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#include "config.h"
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#include <glib.h>
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#include <epan/wmem/wmem.h>
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#include <epan/packet.h>
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#include <epan/tvbparse.h>
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static dissector_handle_t json_handle;
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static gint ett_json = -1;
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static gint ett_json_array = -1;
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static gint ett_json_object = -1;
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static gint ett_json_member = -1;
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static header_field_info *hfi_json = NULL;
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#define JSON_HFI_INIT HFI_INIT(proto_json)
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static header_field_info hfi_json_array JSON_HFI_INIT =
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{ "Array", "json.array", FT_NONE, BASE_NONE, NULL, 0x00, "JSON array", HFILL };
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static header_field_info hfi_json_object JSON_HFI_INIT =
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{ "Object", "json.object", FT_NONE, BASE_NONE, NULL, 0x00, "JSON object", HFILL };
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static header_field_info hfi_json_member JSON_HFI_INIT =
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{ "Member", "json.member", FT_NONE, BASE_NONE, NULL, 0x00, "JSON object member", HFILL };
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#if 0
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/* XXX */
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static header_field_info hfi_json_member_key JSON_HFI_INIT =
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{ "Key", "json.member.key", FT_NONE, BASE_NONE, NULL, 0x00, NULL, HFILL };
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#endif
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static header_field_info hfi_json_value_string JSON_HFI_INIT = /* FT_STRINGZ? */
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{ "String value", "json.value.string", FT_STRING, BASE_NONE, NULL, 0x00, "JSON string value", HFILL };
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static header_field_info hfi_json_value_number JSON_HFI_INIT = /* FT_DOUBLE/ FT_INT64? */
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{ "Number value", "json.value.number", FT_STRING, BASE_NONE, NULL, 0x00, "JSON number value", HFILL };
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static header_field_info hfi_json_value_false JSON_HFI_INIT =
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{ "False value", "json.value.false", FT_NONE, BASE_NONE, NULL, 0x00, "JSON false value", HFILL };
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static header_field_info hfi_json_value_null JSON_HFI_INIT =
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{ "Null value", "json.value.null", FT_NONE, BASE_NONE, NULL, 0x00, "JSON null value", HFILL };
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static header_field_info hfi_json_value_true JSON_HFI_INIT =
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{ "True value", "json.value.true", FT_NONE, BASE_NONE, NULL, 0x00, "JSON true value", HFILL };
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static tvbparse_wanted_t* want;
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static tvbparse_wanted_t* want_ignore;
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static dissector_handle_t text_lines_handle;
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typedef enum {
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JSON_TOKEN_INVALID = -1,
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JSON_TOKEN_NUMBER = 0,
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JSON_TOKEN_STRING,
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JSON_TOKEN_FALSE,
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JSON_TOKEN_NULL,
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JSON_TOKEN_TRUE,
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/* not really tokens ... */
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JSON_OBJECT,
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JSON_ARRAY
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} json_token_type_t;
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typedef struct {
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wmem_stack_t *stack;
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} json_parser_data_t;
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static int
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dissect_json(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data)
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{
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proto_tree *json_tree = NULL;
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proto_item *ti = NULL;
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json_parser_data_t parser_data;
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tvbparse_t *tt;
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const char *data_name;
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int offset;
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data_name = pinfo->match_string;
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if (! (data_name && data_name[0])) {
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/*
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* No information from "match_string"
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*/
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data_name = (char *)data;
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if (! (data_name && data_name[0])) {
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/*
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* No information from dissector data
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*/
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data_name = (char *)(pinfo->private_data);
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if (! (data_name && data_name[0])) {
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/*
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* No information from "private_data"
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*/
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data_name = NULL;
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}
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}
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}
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if (tree) {
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ti = proto_tree_add_item(tree, hfi_json, tvb, 0, -1, ENC_NA);
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json_tree = proto_item_add_subtree(ti, ett_json);
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if (data_name)
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proto_item_append_text(ti, ": %s", data_name);
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}
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offset = 0;
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parser_data.stack = wmem_stack_new(wmem_packet_scope());
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wmem_stack_push(parser_data.stack, json_tree);
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tt = tvbparse_init(tvb, offset, -1, &parser_data, want_ignore);
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/* XXX, only one json in packet? */
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while ((tvbparse_get(tt, want)))
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;
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offset = tvbparse_curr_offset(tt);
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proto_item_set_len(ti, offset);
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/* if we have some unparsed data, pass to data-text-lines dissector (?) */
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if (tvb_length_remaining(tvb, offset) > 0) {
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int datalen, reported_datalen;
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tvbuff_t *next_tvb;
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datalen = tvb_length_remaining(tvb, offset);
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reported_datalen = tvb_reported_length_remaining(tvb, offset);
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next_tvb = tvb_new_subset(tvb, offset, datalen, reported_datalen);
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call_dissector(text_lines_handle, next_tvb, pinfo, tree);
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} else if (data_name) {
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col_append_sep_fstr(pinfo->cinfo, COL_INFO, " ", "(%s)", data_name);
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}
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return tvb_length(tvb);
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}
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static void before_object(void *tvbparse_data, const void *wanted_data _U_, tvbparse_elem_t *tok) {
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json_parser_data_t *data = (json_parser_data_t *) tvbparse_data;
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proto_tree *tree = (proto_tree *)wmem_stack_peek(data->stack);
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proto_tree *subtree;
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proto_item *ti;
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ti = proto_tree_add_item(tree, &hfi_json_object, tok->tvb, tok->offset, tok->len, ENC_NA);
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subtree = proto_item_add_subtree(ti, ett_json_object);
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wmem_stack_push(data->stack, subtree);
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}
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static void after_object(void *tvbparse_data, const void *wanted_data _U_, tvbparse_elem_t *elem _U_) {
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json_parser_data_t *data = (json_parser_data_t *) tvbparse_data;
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wmem_stack_pop(data->stack);
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}
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static void before_member(void *tvbparse_data, const void *wanted_data _U_, tvbparse_elem_t *tok) {
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json_parser_data_t *data = (json_parser_data_t *) tvbparse_data;
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proto_tree *tree = (proto_tree *)wmem_stack_peek(data->stack);
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proto_tree *subtree;
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proto_item *ti;
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ti = proto_tree_add_item(tree, &hfi_json_member, tok->tvb, tok->offset, tok->len, ENC_NA);
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subtree = proto_item_add_subtree(ti, ett_json_member);
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wmem_stack_push(data->stack, subtree);
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}
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static void after_member(void *tvbparse_data, const void *wanted_data _U_, tvbparse_elem_t *tok) {
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json_parser_data_t *data = (json_parser_data_t *) tvbparse_data;
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proto_tree *tree = (proto_tree *)wmem_stack_pop(data->stack);
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if (tree) {
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tvbparse_elem_t *key_tok = tok->sub;
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if (key_tok && key_tok->id == JSON_TOKEN_STRING) {
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char *key = tvb_get_string(wmem_packet_scope(), key_tok->tvb, key_tok->offset, key_tok->len);
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proto_item_append_text(tree, " Key: %s", key);
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}
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/* XXX, &hfi_json_member_key */
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}
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}
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static void before_array(void *tvbparse_data, const void *wanted_data _U_, tvbparse_elem_t *tok) {
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json_parser_data_t *data = (json_parser_data_t *) tvbparse_data;
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proto_tree *tree = (proto_tree *)wmem_stack_peek(data->stack);
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proto_tree *subtree;
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proto_item *ti;
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ti = proto_tree_add_item(tree, &hfi_json_array, tok->tvb, tok->offset, tok->len, ENC_NA);
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subtree = proto_item_add_subtree(ti, ett_json_array);
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wmem_stack_push(data->stack, subtree);
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}
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static void after_array(void *tvbparse_data, const void *wanted_data _U_, tvbparse_elem_t *elem _U_) {
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json_parser_data_t *data = (json_parser_data_t *) tvbparse_data;
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wmem_stack_pop(data->stack);
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}
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/*
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* defines for helping with UTF-16 surrogate pairs
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*/
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#define LEAD_SURROGATE_START 0xd800
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#define LEAD_SURROGATE_END 0xdbff
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#define TRAIL_SURROGATE_START 0xdc00
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#define TRAIL_SURROGATE_END 0xdfff
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#define IS_LEAD_SURROGATE(l) (((l)>=LEAD_SURROGATE_START)&&((l)<=LEAD_SURROGATE_END))
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#define IS_TRAIL_SURROGATE(t) (((t)>=TRAIL_SURROGATE_START)&&((t)<=TRAIL_SURROGATE_END))
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#define GET_UNICHAR_FROM_SURROGATES(l,t) (0x10000+(((l-LEAD_SURROGATE_START)<<10)|(t-TRAIL_SURROGATE_START)))
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static char *json_string_unescape(tvbparse_elem_t *tok)
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{
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char *str = (char *)wmem_alloc(wmem_packet_scope(), tok->len - 1);
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int i, j;
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j = 0;
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for (i = 1; i < tok->len - 1; i++) {
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guint8 ch = tvb_get_guint8(tok->tvb, tok->offset + i);
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if (ch == '\\') {
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i++;
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ch = tvb_get_guint8(tok->tvb, tok->offset + i);
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switch (ch) {
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case '\"':
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case '\\':
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case '/':
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default:
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str[j++] = ch;
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break;
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case 'b':
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str[j++] = '\b';
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break;
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case 'f':
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str[j++] = '\f';
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break;
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case 'n':
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str[j++] = '\n';
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break;
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case 'r':
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str[j++] = '\r';
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break;
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case 't':
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str[j++] = '\t';
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break;
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case 'u':
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{
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guint32 unicode_hex = 0;
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gboolean valid = TRUE;
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int k;
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for (k = 0; k < 4; k++) {
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i++;
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unicode_hex <<= 4;
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ch = tvb_get_guint8(tok->tvb, tok->offset + i);
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if (ch >= '0' && ch <= '9')
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unicode_hex |= (ch - '0');
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else if (ch >= 'a' && ch <= 'f')
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unicode_hex |= (10 + (ch - 'a'));
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else if (ch >= 'A' && ch <= 'F')
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unicode_hex |= (10 + (ch - 'A'));
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else {
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valid = FALSE;
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break;
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}
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}
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if ((IS_LEAD_SURROGATE(unicode_hex))) {
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ch = tvb_get_guint8(tok->tvb, tok->offset + i + 1);
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if (ch == '\\') {
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i++;
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ch = tvb_get_guint8(tok->tvb, tok->offset + i + 1);
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if (ch == 'u') {
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guint16 lead_surrogate = unicode_hex;
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guint16 trail_surrogate = 0;
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i++;
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for (k = 0; k < 4; k++) {
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i++;
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trail_surrogate <<= 4;
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ch = tvb_get_guint8(tok->tvb, tok->offset + i);
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if (ch >= '0' && ch <= '9')
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trail_surrogate |= (ch - '0');
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else if (ch >= 'a' && ch <= 'f')
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trail_surrogate |= (10 + (ch - 'a'));
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else if (ch >= 'A' && ch <= 'F')
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trail_surrogate |= (10 + (ch - 'A'));
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else {
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valid = FALSE;
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break;
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}
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}
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if ((IS_TRAIL_SURROGATE(trail_surrogate))) {
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unicode_hex = GET_UNICHAR_FROM_SURROGATES(lead_surrogate,trail_surrogate);
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} else {
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valid = FALSE;
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}
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} else {
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valid = FALSE;
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}
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} else {
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valid = FALSE;
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}
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} else if ((IS_TRAIL_SURROGATE(unicode_hex))) {
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i++;
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valid = FALSE;
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}
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if (valid && g_unichar_validate(unicode_hex) && g_unichar_isprint(unicode_hex)) {
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/* \uXXXX => 6 bytes */
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int charlen = g_unichar_to_utf8(unicode_hex, &str[j]);
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j += charlen;
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} else
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str[j++] = '?';
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break;
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}
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}
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} else
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str[j++] = ch;
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}
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str[j] = '\0';
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return str;
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}
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static void after_value(void *tvbparse_data, const void *wanted_data _U_, tvbparse_elem_t *tok) {
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json_parser_data_t *data = (json_parser_data_t *) tvbparse_data;
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proto_tree *tree = (proto_tree *)wmem_stack_peek(data->stack);
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json_token_type_t value_id = JSON_TOKEN_INVALID;
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if (tok->sub)
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value_id = (json_token_type_t)tok->sub->id;
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switch (value_id) {
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case JSON_TOKEN_STRING:
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if (tok->len >= 2)
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proto_tree_add_unicode_string(tree, hfi_json_value_string.id, tok->tvb, tok->offset, tok->len, json_string_unescape(tok));
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else
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proto_tree_add_item(tree, &hfi_json_value_string, tok->tvb, tok->offset, tok->len, ENC_ASCII|ENC_NA);
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break;
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case JSON_TOKEN_NUMBER:
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/* XXX, convert to number */
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proto_tree_add_item(tree, &hfi_json_value_number, tok->tvb, tok->offset, tok->len, ENC_ASCII|ENC_NA);
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break;
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case JSON_TOKEN_FALSE:
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proto_tree_add_item(tree, &hfi_json_value_false, tok->tvb, tok->offset, tok->len, ENC_NA);
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break;
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case JSON_TOKEN_NULL:
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proto_tree_add_item(tree, &hfi_json_value_null, tok->tvb, tok->offset, tok->len, ENC_NA);
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break;
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case JSON_TOKEN_TRUE:
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proto_tree_add_item(tree, &hfi_json_value_true, tok->tvb, tok->offset, tok->len, ENC_NA);
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break;
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case JSON_OBJECT:
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case JSON_ARRAY:
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/* already added */
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break;
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default:
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proto_tree_add_text(tree, tok->tvb, tok->offset, tok->len, "%s", tvb_format_text(tok->tvb, tok->offset, tok->len));
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break;
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}
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}
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static void init_json_parser(void) {
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static tvbparse_wanted_t _want_object;
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static tvbparse_wanted_t _want_array;
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tvbparse_wanted_t *want_object, *want_array;
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tvbparse_wanted_t *want_member;
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tvbparse_wanted_t *want_string;
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tvbparse_wanted_t *want_number, *want_int;
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tvbparse_wanted_t *want_value;
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tvbparse_wanted_t *want_value_separator;
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#define tvbparse_optional(id, private_data, before_cb, after_cb, wanted) \
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tvbparse_some(id, 0, 1, private_data, before_cb, after_cb, wanted)
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tvbparse_wanted_t *want_quot = tvbparse_char(-1,"\"",NULL,NULL,NULL);
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want_string = tvbparse_set_seq(JSON_TOKEN_STRING, NULL, NULL, NULL,
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want_quot,
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tvbparse_some(-1, 0, G_MAXINT, NULL, NULL, NULL,
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tvbparse_set_oneof(-1, NULL, NULL, NULL,
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tvbparse_not_chars(-1, 0, 0, "\"" "\\", NULL, NULL, NULL), /* XXX, without invalid unicode characters */
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tvbparse_set_seq(-1, NULL, NULL, NULL,
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tvbparse_char(-1, "\\", NULL, NULL, NULL),
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tvbparse_set_oneof(-1, NULL, NULL, NULL,
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tvbparse_chars(-1, 0, 1, "\"" "\\" "/bfnrt", NULL, NULL, NULL),
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tvbparse_set_seq(-1, NULL, NULL, NULL,
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tvbparse_char(-1, "u", NULL, NULL, NULL),
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tvbparse_chars(-1, 4, 4, "0123456789abcdefABCDEF", NULL, NULL, NULL),
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NULL),
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NULL),
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NULL),
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NULL)
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),
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want_quot,
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NULL);
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want_value_separator = tvbparse_char(-1, ",", NULL, NULL, NULL);
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/* int = zero / ( digit1-9 *DIGIT ) */
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want_int = tvbparse_set_oneof(-1, NULL, NULL, NULL,
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tvbparse_char(-1, "0", NULL, NULL, NULL),
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tvbparse_set_seq(-1, NULL, NULL, NULL,
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tvbparse_chars(-1, 1, 1, "123456789", NULL, NULL, NULL),
|
|
tvbparse_optional(-1, NULL, NULL, NULL, /* tvbparse_chars() don't respect 0 as min_len ;/ */
|
|
tvbparse_chars(-1, 0, 0, "0123456789", NULL, NULL, NULL)),
|
|
NULL),
|
|
NULL);
|
|
|
|
/* number = [ minus ] int [ frac ] [ exp ] */
|
|
want_number = tvbparse_set_seq(JSON_TOKEN_NUMBER, NULL, NULL, NULL,
|
|
tvbparse_optional(-1, NULL, NULL, NULL, /* tvbparse_chars() don't respect 0 as min_len ;/ */
|
|
tvbparse_chars(-1, 0, 1, "-", NULL, NULL, NULL)),
|
|
want_int,
|
|
/* frac = decimal-point 1*DIGIT */
|
|
tvbparse_optional(-1, NULL, NULL, NULL,
|
|
tvbparse_set_seq(-1, NULL, NULL, NULL,
|
|
tvbparse_char(-1, ".", NULL, NULL, NULL),
|
|
tvbparse_chars(-1, 1, 0, "0123456789", NULL, NULL, NULL),
|
|
NULL)),
|
|
/* exp = e [ minus / plus ] 1*DIGIT */
|
|
tvbparse_optional(-1, NULL, NULL, NULL,
|
|
tvbparse_set_seq(-1, NULL, NULL, NULL,
|
|
tvbparse_char(-1, "eE", NULL, NULL, NULL),
|
|
tvbparse_optional(-1, NULL, NULL, NULL, /* tvbparse_chars() don't respect 0 as min_len ;/ */
|
|
tvbparse_chars(-1, 0, 1, "-+", NULL, NULL, NULL)),
|
|
tvbparse_chars(-1, 1, 0, "0123456789", NULL, NULL, NULL),
|
|
NULL)),
|
|
NULL);
|
|
|
|
/* value = false / null / true / object / array / number / string */
|
|
want_value = tvbparse_set_oneof(-1, NULL, NULL, after_value,
|
|
tvbparse_string(JSON_TOKEN_FALSE, "false", NULL, NULL, NULL),
|
|
tvbparse_string(JSON_TOKEN_NULL, "null", NULL, NULL, NULL),
|
|
tvbparse_string(JSON_TOKEN_TRUE, "true", NULL, NULL, NULL),
|
|
&_want_object,
|
|
&_want_array,
|
|
want_number,
|
|
want_string,
|
|
NULL);
|
|
|
|
/* array = begin-array [ value *( value-separator value ) ] end-array */
|
|
want_array = tvbparse_set_seq(JSON_ARRAY, NULL, before_array, after_array,
|
|
tvbparse_char(-1, "[", NULL, NULL, NULL),
|
|
tvbparse_optional(-1, NULL, NULL, NULL,
|
|
tvbparse_set_seq(-1, NULL, NULL, NULL,
|
|
want_value,
|
|
tvbparse_some(-1, 0, G_MAXINT, NULL, NULL, NULL,
|
|
tvbparse_set_seq(-1, NULL, NULL, NULL,
|
|
want_value_separator,
|
|
want_value,
|
|
NULL)),
|
|
NULL)
|
|
),
|
|
tvbparse_char(-1, "]", NULL, NULL, NULL),
|
|
NULL);
|
|
_want_array = *want_array;
|
|
|
|
/* member = string name-separator value */
|
|
want_member = tvbparse_set_seq(-1, NULL, before_member, after_member,
|
|
want_string,
|
|
tvbparse_char(-1, ":", NULL, NULL, NULL),
|
|
want_value,
|
|
NULL);
|
|
|
|
/* object = begin-object [ member *( value-separator member ) ] end-object */
|
|
want_object = tvbparse_set_seq(JSON_OBJECT, NULL, before_object, after_object,
|
|
tvbparse_char(-1, "{", NULL, NULL, NULL),
|
|
tvbparse_optional(-1, NULL, NULL, NULL,
|
|
tvbparse_set_seq(-1, NULL, NULL, NULL,
|
|
want_member,
|
|
tvbparse_some(-1, 0, G_MAXINT, NULL, NULL, NULL,
|
|
tvbparse_set_seq(-1, NULL, NULL, NULL,
|
|
want_value_separator,
|
|
want_member,
|
|
NULL)),
|
|
NULL)
|
|
),
|
|
tvbparse_char(-1, "}", NULL, NULL, NULL),
|
|
NULL);
|
|
_want_object = *want_object;
|
|
|
|
want_ignore = tvbparse_chars(-1, 1, 0, " \t\r\n", NULL, NULL, NULL);
|
|
|
|
/* JSON-text = object / array */
|
|
want = tvbparse_set_oneof(-1, NULL, NULL, NULL,
|
|
want_object,
|
|
want_array,
|
|
/* tvbparse_not_chars(-1, 1, 0, " \t\r\n", NULL, NULL, NULL), */
|
|
NULL);
|
|
|
|
/* XXX, heur? */
|
|
}
|
|
|
|
void
|
|
proto_register_json(void) {
|
|
static gint *ett[] = {
|
|
&ett_json,
|
|
&ett_json_array,
|
|
&ett_json_object,
|
|
&ett_json_member
|
|
};
|
|
|
|
#ifndef HAVE_HFI_SECTION_INIT
|
|
static header_field_info *hfi[] = {
|
|
&hfi_json_array,
|
|
&hfi_json_object,
|
|
&hfi_json_member,
|
|
/* &hfi_json_member_key, */
|
|
&hfi_json_value_string,
|
|
&hfi_json_value_number,
|
|
&hfi_json_value_false,
|
|
&hfi_json_value_null,
|
|
&hfi_json_value_true,
|
|
};
|
|
#endif
|
|
|
|
int proto_json;
|
|
|
|
proto_json = proto_register_protocol("JavaScript Object Notation", "JSON", "json");
|
|
hfi_json = proto_registrar_get_nth(proto_json);
|
|
|
|
proto_register_fields(proto_json, hfi, array_length(hfi));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
|
|
json_handle = new_register_dissector("json", dissect_json, proto_json);
|
|
|
|
init_json_parser();
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_json(void)
|
|
{
|
|
dissector_add_string("media_type", "application/json", json_handle); /* RFC 4627 */
|
|
dissector_add_string("media_type", "application/json-rpc", json_handle); /* JSON-RPC over HTTP */
|
|
dissector_add_string("media_type", "application/jsonrequest", json_handle); /* JSON-RPC over HTTP */
|
|
|
|
text_lines_handle = find_dissector("data-text-lines");
|
|
}
|
|
|