138 lines
3.3 KiB
C
138 lines
3.3 KiB
C
/* json.c
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*
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* Copyright 2015, Dario Lombardo <lomato@gmail.com>
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include "config.h"
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#include <string.h>
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#include "wtap-int.h"
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#include "file_wrappers.h"
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#include "json.h"
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#include <wsutil/wsjson.h>
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static gboolean json_read_file(wtap *wth, FILE_T fh, wtap_rec *rec,
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Buffer *buf, int *err, gchar **err_info)
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{
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gint64 file_size;
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int packet_size;
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if ((file_size = wtap_file_size(wth, err)) == -1)
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return FALSE;
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if (file_size > MAX_FILE_SIZE) {
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/*
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* Don't blow up trying to allocate space for an
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* immensely-large file.
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*/
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*err = WTAP_ERR_BAD_FILE;
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*err_info = g_strdup_printf("json: File has %" G_GINT64_MODIFIER "d-byte packet, bigger than maximum of %u",
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file_size, MAX_FILE_SIZE);
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return FALSE;
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}
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packet_size = (int)file_size;
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rec->rec_type = REC_TYPE_PACKET;
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rec->presence_flags = 0; /* yes, we have no bananas^Wtime stamp */
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rec->rec_header.packet_header.caplen = packet_size;
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rec->rec_header.packet_header.len = packet_size;
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rec->ts.secs = 0;
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rec->ts.nsecs = 0;
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return wtap_read_packet_bytes(fh, buf, packet_size, err, err_info);
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}
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static gboolean json_seek_read(wtap *wth, gint64 seek_off, wtap_rec *rec, Buffer *buf,
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int *err, gchar **err_info)
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{
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/* there is only one packet */
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if (seek_off > 0) {
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*err = 0;
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return FALSE;
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}
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if (file_seek(wth->random_fh, seek_off, SEEK_SET, err) == -1)
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return FALSE;
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return json_read_file(wth, wth->random_fh, rec, buf, err, err_info);
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}
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static gboolean json_read(wtap *wth, int *err, gchar **err_info, gint64 *data_offset)
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{
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gint64 offset;
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*err = 0;
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offset = file_tell(wth->fh);
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/* there is only ever one packet */
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if (offset != 0)
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return FALSE;
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*data_offset = offset;
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return json_read_file(wth, wth->fh, &wth->rec, wth->rec_data, err, err_info);
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}
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wtap_open_return_val json_open(wtap *wth, int *err, gchar **err_info)
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{
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guint8* filebuf;
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int bytes_read;
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filebuf = (guint8*)g_malloc0(MAX_FILE_SIZE);
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if (!filebuf)
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return WTAP_OPEN_ERROR;
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bytes_read = file_read(filebuf, MAX_FILE_SIZE, wth->fh);
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if (bytes_read < 0) {
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/* Read error. */
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*err = file_error(wth->fh, err_info);
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g_free(filebuf);
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return WTAP_OPEN_ERROR;
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}
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if (bytes_read == 0) {
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/* empty file, not *anybody's* */
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g_free(filebuf);
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return WTAP_OPEN_NOT_MINE;
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}
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if (wsjson_is_valid_json(filebuf, bytes_read) == FALSE) {
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g_free(filebuf);
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return WTAP_OPEN_NOT_MINE;
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}
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if (file_seek(wth->fh, 0, SEEK_SET, err) == -1) {
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g_free(filebuf);
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return WTAP_OPEN_ERROR;
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}
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wth->file_type_subtype = WTAP_FILE_TYPE_SUBTYPE_JSON;
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wth->file_encap = WTAP_ENCAP_JSON;
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wth->file_tsprec = WTAP_TSPREC_SEC;
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wth->subtype_read = json_read;
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wth->subtype_seek_read = json_seek_read;
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wth->snapshot_length = 0;
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g_free(filebuf);
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return WTAP_OPEN_MINE;
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}
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/*
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* Editor modelines - http://www.wireshark.org/tools/modelines.html
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*
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* Local variables:
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* c-basic-offset: 4
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* tab-width: 8
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* indent-tabs-mode: nil
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* End:
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*
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* vi: set shiftwidth=4 tabstop=8 expandtab:
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* :indentSize=4:tabSize=8:noTabs=true:
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*/
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