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wireshark/reordercap.c

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/* Reorder the frames from an input dump file, and write to output dump file.
* Martin Mathieson and Jakub Jawadzki
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <glib.h>
#include <wsutil/ws_getopt.h>
#include <wiretap/wtap.h>
#include <ui/cmdarg_err.h>
#include <ui/exit_codes.h>
#include <wsutil/filesystem.h>
#include <wsutil/file_util.h>
#include <wsutil/privileges.h>
#include <cli_main.h>
#include <ui/version_info.h>
#include <wiretap/wtap_opttypes.h>
#ifdef HAVE_PLUGINS
#include <wsutil/plugins.h>
#endif
#include <wsutil/report_message.h>
#include <wsutil/wslog.h>
#include "ui/failure_message.h"
/* Additional exit codes */
#define OUTPUT_FILE_ERROR 1
/* Show command-line usage */
static void
print_usage(FILE *output)
{
fprintf(output, "\n");
fprintf(output, "Usage: reordercap [options] <infile> <outfile>\n");
fprintf(output, "\n");
fprintf(output, "Options:\n");
fprintf(output, " -n don't write to output file if the input file is ordered.\n");
fprintf(output, " -h display this help and exit.\n");
fprintf(output, " -v print version information and exit.\n");
}
/* Remember where this frame was in the file */
typedef struct FrameRecord_t {
gint64 offset;
guint num;
nstime_t frame_time;
} FrameRecord_t;
/**************************************************/
/* Debugging only */
/* Enable this symbol to see debug output */
/* #define REORDER_DEBUG */
#ifdef REORDER_DEBUG
#define DEBUG_PRINT printf
#else
#define DEBUG_PRINT(...)
#endif
/**************************************************/
static void
frame_write(FrameRecord_t *frame, wtap *wth, wtap_dumper *pdh,
wtap_rec *rec, Buffer *buf, const char *infile,
const char *outfile)
{
int err;
gchar *err_info;
DEBUG_PRINT("\nDumping frame (offset=%" G_GINT64_MODIFIER "u)\n",
frame->offset);
/* Re-read the frame from the stored location */
if (!wtap_seek_read(wth, frame->offset, rec, buf, &err, &err_info)) {
if (err != 0) {
/* Print a message noting that the read failed somewhere along the line. */
fprintf(stderr,
"reordercap: An error occurred while re-reading \"%s\".\n",
infile);
cfile_read_failure_message(infile, err, err_info);
exit(1);
}
}
/* Copy, and set length and timestamp from item. */
/* TODO: remove when wtap_seek_read() fills in rec,
including time stamps, for all file types */
rec->ts = frame->frame_time;
/* Dump frame to outfile */
if (!wtap_dump(pdh, rec, ws_buffer_start_ptr(buf), &err, &err_info)) {
cfile_write_failure_message(infile, outfile, err, err_info, frame->num,
wtap_file_type_subtype(wth));
exit(1);
}
wtap_rec_reset(rec);
}
/* Comparing timestamps between 2 frames.
negative if (t1 < t2)
zero if (t1 == t2)
positive if (t1 > t2)
*/
static int
frames_compare(gconstpointer a, gconstpointer b)
{
const FrameRecord_t *frame1 = *(const FrameRecord_t *const *) a;
const FrameRecord_t *frame2 = *(const FrameRecord_t *const *) b;
const nstime_t *time1 = &frame1->frame_time;
const nstime_t *time2 = &frame2->frame_time;
return nstime_cmp(time1, time2);
}
/*
* General errors and warnings are reported with an console message
* in reordercap.
*/
static void
reordercap_cmdarg_err(const char *msg_format, va_list ap)
{
fprintf(stderr, "reordercap: ");
vfprintf(stderr, msg_format, ap);
fprintf(stderr, "\n");
}
/*
* Report additional information for an error in command-line arguments.
*/
static void
reordercap_cmdarg_err_cont(const char *msg_format, va_list ap)
{
vfprintf(stderr, msg_format, ap);
fprintf(stderr, "\n");
}
/********************************************************************/
/* Main function. */
/********************************************************************/
int
main(int argc, char *argv[])
{
char *init_progfile_dir_error;
static const struct report_message_routines reordercap_message_routines = {
failure_message,
failure_message,
open_failure_message,
read_failure_message,
write_failure_message,
cfile_open_failure_message,
cfile_dump_open_failure_message,
cfile_read_failure_message,
cfile_write_failure_message,
cfile_close_failure_message
};
wtap *wth = NULL;
wtap_dumper *pdh = NULL;
wtap_rec rec;
Buffer buf;
int err;
gchar *err_info;
gint64 data_offset;
guint wrong_order_count = 0;
gboolean write_output_regardless = TRUE;
guint i;
wtap_dump_params params;
int ret = EXIT_SUCCESS;
GPtrArray *frames;
FrameRecord_t *prevFrame = NULL;
int opt;
static const struct ws_option long_options[] = {
{"help", ws_no_argument, NULL, 'h'},
{"version", ws_no_argument, NULL, 'v'},
{0, 0, 0, 0 }
};
int file_count;
char *infile;
const char *outfile;
cmdarg_err_init(reordercap_cmdarg_err, reordercap_cmdarg_err_cont);
/* Initialize log handler early so we can have proper logging during startup. */
ws_log_init("reordercap", vcmdarg_err);
/* Early logging command-line initialization. */
ws_log_parse_args(&argc, argv, vcmdarg_err, INVALID_OPTION);
/* Initialize the version information. */
ws_init_version_info("Reordercap (Wireshark)", NULL, NULL, NULL);
/*
* Get credential information for later use.
*/
init_process_policies();
/*
* Attempt to get the pathname of the directory containing the
* executable file.
*/
init_progfile_dir_error = init_progfile_dir(argv[0]);
if (init_progfile_dir_error != NULL) {
fprintf(stderr,
"reordercap: Can't get pathname of directory containing the reordercap program: %s.\n",
init_progfile_dir_error);
g_free(init_progfile_dir_error);
}
init_report_message("reordercap", &reordercap_message_routines);
wtap_init(TRUE);
/* Process the options first */
while ((opt = ws_getopt_long(argc, argv, "hnv", long_options, NULL)) != -1) {
switch (opt) {
case 'n':
write_output_regardless = FALSE;
break;
case 'h':
show_help_header("Reorder timestamps of input file frames into output file.");
print_usage(stdout);
goto clean_exit;
case 'v':
show_version();
goto clean_exit;
case '?':
print_usage(stderr);
ret = INVALID_OPTION;
goto clean_exit;
}
}
/* Remaining args are file names */
file_count = argc - ws_optind;
if (file_count == 2) {
infile = argv[ws_optind];
outfile = argv[ws_optind+1];
}
else {
print_usage(stderr);
ret = INVALID_OPTION;
goto clean_exit;
}
/* Open infile */
/* TODO: if reordercap is ever changed to give the user a choice of which
open_routine reader to use, then the following needs to change. */
wth = wtap_open_offline(infile, WTAP_TYPE_AUTO, &err, &err_info, TRUE);
if (wth == NULL) {
cfile_open_failure_message(infile, err, err_info);
ret = OPEN_ERROR;
goto clean_exit;
}
DEBUG_PRINT("file_type_subtype is %d\n", wtap_file_type_subtype(wth));
wtap_dump_params_init(&params, wth);
/* Open outfile (same filetype/encap as input file) */
if (strcmp(outfile, "-") == 0) {
pdh = wtap_dump_open_stdout(wtap_file_type_subtype(wth),
WTAP_UNCOMPRESSED, &params, &err, &err_info);
} else {
pdh = wtap_dump_open(outfile, wtap_file_type_subtype(wth),
WTAP_UNCOMPRESSED, &params, &err, &err_info);
}
g_free(params.idb_inf);
params.idb_inf = NULL;
if (pdh == NULL) {
cfile_dump_open_failure_message(outfile, err, err_info,
wtap_file_type_subtype(wth));
wtap_dump_params_cleanup(&params);
ret = OUTPUT_FILE_ERROR;
goto clean_exit;
}
/* Allocate the array of frame pointers. */
frames = g_ptr_array_new();
/* Read each frame from infile */
wtap_rec_init(&rec);
ws_buffer_init(&buf, 1514);
while (wtap_read(wth, &rec, &buf, &err, &err_info, &data_offset)) {
FrameRecord_t *newFrameRecord;
newFrameRecord = g_slice_new(FrameRecord_t);
newFrameRecord->num = frames->len + 1;
newFrameRecord->offset = data_offset;
if (rec.presence_flags & WTAP_HAS_TS) {
newFrameRecord->frame_time = rec.ts;
} else {
nstime_set_unset(&newFrameRecord->frame_time);
}
if (prevFrame && frames_compare(&newFrameRecord, &prevFrame) < 0) {
wrong_order_count++;
}
g_ptr_array_add(frames, newFrameRecord);
prevFrame = newFrameRecord;
wtap_rec_reset(&rec);
}
wtap_rec_cleanup(&rec);
ws_buffer_free(&buf);
if (err != 0) {
/* Print a message noting that the read failed somewhere along the line. */
cfile_read_failure_message(infile, err, err_info);
}
printf("%u frames, %u out of order\n", frames->len, wrong_order_count);
/* Sort the frames */
if (wrong_order_count > 0) {
g_ptr_array_sort(frames, frames_compare);
}
/* Write out each sorted frame in turn */
wtap_rec_init(&rec);
ws_buffer_init(&buf, 1514);
for (i = 0; i < frames->len; i++) {
FrameRecord_t *frame = (FrameRecord_t *)frames->pdata[i];
/* Avoid writing if already sorted and configured to */
if (write_output_regardless || (wrong_order_count > 0)) {
frame_write(frame, wth, pdh, &rec, &buf, infile, outfile);
}
g_slice_free(FrameRecord_t, frame);
}
wtap_rec_cleanup(&rec);
ws_buffer_free(&buf);
if (!write_output_regardless && (wrong_order_count == 0)) {
printf("Not writing output file because input file is already in order.\n");
}
/* Free the whole array */
g_ptr_array_free(frames, TRUE);
/* Close outfile */
if (!wtap_dump_close(pdh, &err, &err_info)) {
cfile_close_failure_message(outfile, err, err_info);
wtap_dump_params_cleanup(&params);
ret = OUTPUT_FILE_ERROR;
goto clean_exit;
}
wtap_dump_params_cleanup(&params);
/* Finally, close infile and release resources. */
wtap_close(wth);
clean_exit:
wtap_cleanup();
free_progdirs();
return ret;
}
/*
* 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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