From bd911096bd469b70ffedef409746cff8bce68c8a Mon Sep 17 00:00:00 2001 From: Dario Lombardo Date: Mon, 19 Jan 2015 19:54:41 +0100 Subject: Added JSON native file support. libjsmn has also been moved from epan/ to wsutil/ to make it visible from wiretap. Change-Id: I59abb3419acb1baa83194b38152d3651ed5c123c Bug: 10878 Reviewed-on: https://code.wireshark.org/review/6716 Reviewed-by: Pascal Quantin --- wiretap/json.c | 138 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 138 insertions(+) create mode 100644 wiretap/json.c (limited to 'wiretap/json.c') diff --git a/wiretap/json.c b/wiretap/json.c new file mode 100644 index 0000000000..9e81f2e56d --- /dev/null +++ b/wiretap/json.c @@ -0,0 +1,138 @@ +/* json.c + * + * Copyright 2015, Dario Lombardo + * + * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +#include "config.h" + +#include + +#include "wtap-int.h" +#include "file_wrappers.h" + +#include +#include + +static gboolean json_read_file(wtap *wth, FILE_T fh, struct wtap_pkthdr *phdr, + Buffer *buf, int *err, gchar **err_info) +{ + gint64 file_size; + int packet_size; + + if ((file_size = wtap_file_size(wth, err)) == -1) + return FALSE; + + if (file_size > MAX_FILE_SIZE) { + /* + * Don't blow up trying to allocate space for an + * immensely-large file. + */ + *err = WTAP_ERR_BAD_FILE; + *err_info = g_strdup_printf("mime_file: File has %" G_GINT64_MODIFIER "d-byte packet, bigger than maximum of %u", + file_size, MAX_FILE_SIZE); + return FALSE; + } + packet_size = (int)file_size; + + phdr->rec_type = REC_TYPE_PACKET; + phdr->presence_flags = 0; /* yes, we have no bananas^Wtime stamp */ + + phdr->caplen = packet_size; + phdr->len = packet_size; + + phdr->ts.secs = 0; + phdr->ts.nsecs = 0; + + return wtap_read_packet_bytes(fh, buf, packet_size, err, err_info); +} + +static gboolean json_seek_read(wtap *wth, gint64 seek_off, struct wtap_pkthdr *phdr, Buffer *buf, + int *err, gchar **err_info) +{ + /* there is only one packet */ + if (seek_off > 0) { + *err = 0; + return FALSE; + } + + if (file_seek(wth->random_fh, seek_off, SEEK_SET, err) == -1) + return FALSE; + + return json_read_file(wth, wth->random_fh, phdr, buf, err, err_info); +} + +static gboolean json_read(wtap *wth, int *err, gchar **err_info, gint64 *data_offset) +{ + gint64 offset; + + *err = 0; + + offset = file_tell(wth->fh); + + /* there is only ever one packet */ + if (offset != 0) + return FALSE; + + *data_offset = offset; + + return json_read_file(wth, wth->fh, &wth->phdr, wth->frame_buffer, err, err_info); +} + +wtap_open_return_val json_open(wtap *wth, int *err, gchar **err_info _U_) +{ + guint8* filebuf; + guint read; + + filebuf = (guint8*)g_malloc0(MAX_FILE_SIZE); + if (!filebuf) + return WTAP_OPEN_ERROR; + + read = file_read(filebuf, MAX_FILE_SIZE, wth->fh); + + if (jsmn_is_json(filebuf, read) == FALSE) { + 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 = WTAP_FILE_TYPE_SUBTYPE_JSON; + wth->file_encap = WTAP_ENCAP_JSON; + wth->file_tsprec = WTAP_TSPREC_SEC; + wth->subtype_read = json_read; + wth->subtype_seek_read = json_seek_read; + wth->snapshot_length = 0; + + g_free(filebuf); + return WTAP_OPEN_MINE; +} + +/* + * Editor modelines - http://www.wireshark.org/tools/modelines.html + * + * Local variables: + * c-basic-offset: 4 + * tab-width: 4 + * indent-tabs-mode: nil + * End: + * + * vi: set shiftwidth=4 tabstop=8 expandtab: + * :indentSize=4:tabSize=8:noTabs=true: + */ -- cgit v1.2.1