forked from osmocom/wireshark
![Jeff Morriss](/assets/img/avatar_default.png)
https://www.wireshark.org/lists/wireshark-dev/201301/msg00062.html svn path=/trunk/; revision=47088
288 lines
7.7 KiB
C
288 lines
7.7 KiB
C
/* Combine multiple dump files, either by appending or by merging by timestamp
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*
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* Written by Scott Renfro <scott@renfro.org> based on
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* editcap by Richard Sharpe and Guy Harris
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*
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* Copyright 2013, Scott Renfro <scott[AT]renfro.org>
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*
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* $Id$
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <glib.h>
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#include <errno.h>
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#ifdef HAVE_SYS_TIME_H
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#include <sys/time.h>
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#endif
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#include <string.h>
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#include "wtap.h"
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#include "merge.h"
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/*
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* Scan through the arguments and open the input files
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*/
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gboolean
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merge_open_in_files(int in_file_count, char *const *in_file_names,
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merge_in_file_t **in_files, int *err, gchar **err_info,
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int *err_fileno)
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{
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int i, j;
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size_t files_size = in_file_count * sizeof(merge_in_file_t);
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merge_in_file_t *files;
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gint64 size;
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files = (merge_in_file_t *)g_malloc(files_size);
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*in_files = files;
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for (i = 0; i < in_file_count; i++) {
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files[i].filename = in_file_names[i];
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files[i].wth = wtap_open_offline(in_file_names[i], err, err_info, FALSE);
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files[i].data_offset = 0;
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files[i].state = PACKET_NOT_PRESENT;
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files[i].packet_num = 0;
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if (!files[i].wth) {
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/* Close the files we've already opened. */
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for (j = 0; j < i; j++)
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wtap_close(files[j].wth);
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*err_fileno = i;
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return FALSE;
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}
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size = wtap_file_size(files[i].wth, err);
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if (size == -1) {
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for (j = 0; j <= i; j++)
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wtap_close(files[j].wth);
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*err_fileno = i;
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return FALSE;
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}
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files[i].size = size;
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}
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return TRUE;
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}
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/*
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* Scan through and close each input file
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*/
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void
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merge_close_in_files(int count, merge_in_file_t in_files[])
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{
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int i;
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for (i = 0; i < count; i++) {
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wtap_close(in_files[i].wth);
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}
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}
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/*
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* Select an output frame type based on the input files
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* From Guy: If all files have the same frame type, then use that.
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* Otherwise select WTAP_ENCAP_PER_PACKET. If the selected
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* output file type doesn't support per packet frame types,
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* then the wtap_dump_open call will fail with a reasonable
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* error condition.
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*/
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int
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merge_select_frame_type(int count, merge_in_file_t files[])
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{
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int i;
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int selected_frame_type;
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selected_frame_type = wtap_file_encap(files[0].wth);
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for (i = 1; i < count; i++) {
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int this_frame_type = wtap_file_encap(files[i].wth);
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if (selected_frame_type != this_frame_type) {
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selected_frame_type = WTAP_ENCAP_PER_PACKET;
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break;
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}
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}
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return selected_frame_type;
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}
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/*
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* Scan through input files and find maximum snapshot length
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*/
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int
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merge_max_snapshot_length(int count, merge_in_file_t in_files[])
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{
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int i;
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int max_snapshot = 0;
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int snapshot_length;
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for (i = 0; i < count; i++) {
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snapshot_length = wtap_snapshot_length(in_files[i].wth);
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if (snapshot_length == 0) {
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/* Snapshot length of input file not known. */
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snapshot_length = WTAP_MAX_PACKET_SIZE;
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}
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if (snapshot_length > max_snapshot)
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max_snapshot = snapshot_length;
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}
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return max_snapshot;
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}
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/*
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* returns TRUE if first argument is earlier than second
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*/
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static gboolean
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is_earlier(struct wtap_nstime *l, struct wtap_nstime *r) {
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if (l->secs > r->secs) { /* left is later */
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return FALSE;
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} else if (l->secs < r->secs) { /* left is earlier */
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return TRUE;
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} else if (l->nsecs > r->nsecs) { /* tv_sec equal, l.usec later */
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return FALSE;
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}
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/* either one < two or one == two
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* either way, return one
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*/
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return TRUE;
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}
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/*
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* Read the next packet, in chronological order, from the set of files
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* to be merged.
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*
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* On success, set *err to 0 and return a pointer to the merge_in_file_t
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* for the file from which the packet was read.
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*
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* On a read error, set *err to the error and return a pointer to the
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* merge_in_file_t for the file on which we got an error.
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*
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* On an EOF (meaning all the files are at EOF), set *err to 0 and return
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* NULL.
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*/
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merge_in_file_t *
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merge_read_packet(int in_file_count, merge_in_file_t in_files[],
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int *err, gchar **err_info)
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{
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int i;
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int ei = -1;
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struct wtap_nstime tv = { sizeof(time_t) > sizeof(int) ? LONG_MAX : INT_MAX, INT_MAX };
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struct wtap_pkthdr *phdr;
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/*
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* Make sure we have a packet available from each file, if there are any
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* packets left in the file in question, and search for the packet
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* with the earliest time stamp.
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*/
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for (i = 0; i < in_file_count; i++) {
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if (in_files[i].state == PACKET_NOT_PRESENT) {
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/*
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* No packet available, and we haven't seen an error or EOF yet,
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* so try to read the next packet.
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*/
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if (!wtap_read(in_files[i].wth, err, err_info, &in_files[i].data_offset)) {
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if (*err != 0) {
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in_files[i].state = GOT_ERROR;
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return &in_files[i];
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}
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in_files[i].state = AT_EOF;
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} else
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in_files[i].state = PACKET_PRESENT;
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}
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if (in_files[i].state == PACKET_PRESENT) {
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phdr = wtap_phdr(in_files[i].wth);
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if (is_earlier(&phdr->ts, &tv)) {
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tv = phdr->ts;
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ei = i;
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}
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}
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}
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if (ei == -1) {
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/* All the streams are at EOF. Return an EOF indication. */
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*err = 0;
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return NULL;
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}
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/* We'll need to read another packet from this file. */
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in_files[ei].state = PACKET_NOT_PRESENT;
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/* Count this packet. */
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in_files[ei].packet_num++;
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/*
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* Return a pointer to the merge_in_file_t of the file from which the
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* packet was read.
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*/
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*err = 0;
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return &in_files[ei];
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}
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/*
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* Read the next packet, in file sequence order, from the set of files
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* to be merged.
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*
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* On success, set *err to 0 and return a pointer to the merge_in_file_t
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* for the file from which the packet was read.
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*
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* On a read error, set *err to the error and return a pointer to the
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* merge_in_file_t for the file on which we got an error.
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*
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* On an EOF (meaning all the files are at EOF), set *err to 0 and return
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* NULL.
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*/
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merge_in_file_t *
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merge_append_read_packet(int in_file_count, merge_in_file_t in_files[],
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int *err, gchar **err_info)
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{
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int i;
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/*
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* Find the first file not at EOF, and read the next packet from it.
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*/
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for (i = 0; i < in_file_count; i++) {
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if (in_files[i].state == AT_EOF)
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continue; /* This file is already at EOF */
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if (wtap_read(in_files[i].wth, err, err_info, &in_files[i].data_offset))
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break; /* We have a packet */
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if (*err != 0) {
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/* Read error - quit immediately. */
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in_files[i].state = GOT_ERROR;
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return &in_files[i];
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}
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/* EOF - flag this file as being at EOF, and try the next one. */
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in_files[i].state = AT_EOF;
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}
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if (i == in_file_count) {
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/* All the streams are at EOF. Return an EOF indication. */
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*err = 0;
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return NULL;
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}
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/*
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* Return a pointer to the merge_in_file_t of the file from which the
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* packet was read.
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*/
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*err = 0;
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return &in_files[i];
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}
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