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/* json.c
*
* Copyright 2015, Dario Lombardo <lomato@gmail.com>
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "config.h"
#include "json.h"
#include <string.h>
#include "wtap-int.h"
#include "file_wrappers.h"
#include <wsutil/wsjson.h>
/* Maximum size of json file. */
#define MAX_FILE_SIZE (50*1024*1024)
static int json_file_type_subtype = -1;
void register_json(void);
wtap_open_return_val json_open(wtap *wth, int *err, char **err_info)
{
int64_t filesize;
uint8_t* filebuf;
int bytes_read;
/* XXX checking the full file contents might be a bit expensive, maybe
* resort to simpler heuristics like '{' or '[' (with some other chars)? */
if ((filesize = wtap_file_size(wth, err)) == -1)
return WTAP_OPEN_ERROR;
if (filesize > MAX_FILE_SIZE) {
/* Avoid allocating space for an immensely-large file. */
filesize = MAX_FILE_SIZE;
}
filebuf = (uint8_t*)g_malloc0(filesize);
if (!filebuf)
return WTAP_OPEN_ERROR;
bytes_read = file_read(filebuf, (unsigned int) filesize, wth->fh);
if (bytes_read < 0) {
/* Read error. */
*err = file_error(wth->fh, err_info);
g_free(filebuf);
return WTAP_OPEN_ERROR;
}
if (bytes_read == 0) {
/* empty file, not *anybody's* */
g_free(filebuf);
return WTAP_OPEN_NOT_MINE;
}
/* We could reduce the maximum size to read and accept if the parser
* returns JSMN_ERROR_PART (i.e., only fail on JSMN_ERROR_INVAL as we
* shouldn't get JSMN_ERROR_NOMEM if tokens is NULL.) That way we
* could handle bigger files without testing the entire file.
* packet-json shows excess unparsed data at the end with the
* data-text-lines dissector.
*/
if (json_parse_len(filebuf, bytes_read, NULL, 0) < 0) {
g_free(filebuf);
return WTAP_OPEN_NOT_MINE;
}
if (file_seek(wth->fh, 0, SEEK_SET, err) == -1) {
g_free(filebuf);
return WTAP_OPEN_ERROR;
}
wth->file_type_subtype = json_file_type_subtype;
wth->file_encap = WTAP_ENCAP_JSON;
wth->file_tsprec = WTAP_TSPREC_SEC;
wth->subtype_read = wtap_full_file_read;
wth->subtype_seek_read = wtap_full_file_seek_read;
wth->snapshot_length = 0;
g_free(filebuf);
return WTAP_OPEN_MINE;
}
static const struct supported_block_type json_blocks_supported[] = {
/*
* This is a file format that we dissect, so we provide only one
* "packet" with the file's contents, and don't support any
* options.
*/
{ WTAP_BLOCK_PACKET, ONE_BLOCK_SUPPORTED, NO_OPTIONS_SUPPORTED }
};
static const struct file_type_subtype_info json_info = {
"JavaScript Object Notation", "json", "json", NULL,
false, BLOCKS_SUPPORTED(json_blocks_supported),
NULL, NULL, NULL
};
void register_json(void)
{
json_file_type_subtype = wtap_register_file_type_subtype(&json_info);
/*
* Register name for backwards compatibility with the
* wtap_filetypes table in Lua.
*/
wtap_register_backwards_compatibility_lua_name("JSON",
json_file_type_subtype);
}
/*
* Editor modelines - https://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 4
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* vi: set shiftwidth=4 tabstop=8 expandtab:
* :indentSize=4:tabSize=8:noTabs=true:
*/
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