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/* text_import_regex.c
* Regex based text importer
* March 2021, Paul Weiß <paulniklasweiss@gmail.com>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* Based on text_import.c by Jaap Keuter <jaap.keuter@xs4all.nl>
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <glib.h>
#include "text_import.h"
#include "text_import_regex.h"
typedef unsigned int uint;
/*--- Options --------------------------------------------------------------------*/
int text_import_regex(const text_import_info_t* info) {
int status = 1;
int parsed_packets = 0;
ws_debug("starting import...");
// IO
GMappedFile* file = g_mapped_file_ref(info->regex.import_text_GMappedFile);
GError* gerror = NULL;
gsize f_size = g_mapped_file_get_length(file);
guchar* f_content = g_mapped_file_get_contents(file);
{ /* zero terminate the file */
if (f_content[f_size - 1] != '\n') {
fprintf(stderr, "Error: file did not end on \\n\n");
g_mapped_file_unref(file);
return -1;
}
f_content[f_size] = 0;
}
// Regex result dissecting
gboolean re_time, re_dir, re_seqno;
GMatchInfo* match;
gint field_start;
gint field_end;
{ /* analyze regex */
re_time = g_regex_get_string_number(info->regex.format, "time") >= 0;
re_dir = g_regex_get_string_number(info->regex.format, "dir") >= 0;
re_seqno = g_regex_get_string_number(info->regex.format, "seqno") >= 0;
if (g_regex_get_string_number(info->regex.format, "data") < 0) {
/* This should never happen, as the dialog checks for this */
fprintf(stderr, "Error could not find data in pattern\n");
g_mapped_file_unref(file);
return -1;
}
}
ws_debug("regex has %s%s%s", re_dir ? "dir, " : "",
re_time ? "time, " : "",
re_seqno ? "seqno, " : "");
g_regex_match(info->regex.format, f_content, G_REGEX_MATCH_NOTEMPTY, &match);
while (g_match_info_matches(match)) {
/* parse the data */
if (!g_match_info_fetch_named_pos(match, "data", &field_start, &field_end)) {
fprintf(stderr, "Warning: could not fetch data on would be packet %d, discarding\n", parsed_packets + 1);
continue;
}
parse_data(f_content + field_start, f_content + field_end, info->regex.encoding);
/* parse the auxiliary information if present */
if (re_time &&
g_match_info_fetch_named_pos(match, "time", &field_start, &field_end)) {
parse_time(f_content + field_start, f_content + field_end, info->timestamp_format);
} else {
/* No time present, so add a fixed delta. */
parse_time(NULL, NULL, NULL);
}
if (re_dir &&
g_match_info_fetch_named_pos(match, "dir", &field_start, &field_end))
parse_dir(f_content + field_start, f_content + field_end, info->regex.in_indication, info->regex.out_indication);
if (re_seqno &&
g_match_info_fetch_named_pos(match, "seqno", &field_start, &field_end))
parse_seqno(f_content + field_start, f_content + field_end);
if (ws_log_get_level() == LOG_LEVEL_NOISY) {
g_match_info_fetch_pos(match, 0, &field_start, &field_end);
ws_noisy("Packet %d at %x to %x: %.*s\n", parsed_packets + 1,
field_start, field_end,
field_end - field_start, f_content + field_start);
}
flush_packet();
/* prepare next packet */
++parsed_packets;
g_match_info_next(match, &gerror);
if (gerror && gerror->code) {
status = -1;
g_error_free(gerror);
break;
}
}
ws_debug("processed %d packets", parsed_packets);
g_match_info_unref(match);
g_mapped_file_unref(file);
return status * parsed_packets;
}
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