osmith
/
wireshark
forked from osmocom/wireshark
1
0
Fork 0
Code Pull Requests Releases Wiki Activity
wireshark/editcap.c

2018 lines
74 KiB
C
Raw Blame History

/* editcap.c
* Edit capture files. We can delete packets, adjust timestamps, or
* simply convert from one format to another format.
*
* Originally written by Richard Sharpe.
* Improved by Guy Harris.
* Further improved by Richard Sharpe.
*
* Copyright 2013, Richard Sharpe <realrichardsharpe[AT]gmail.com>
*
* 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 <stdarg.h>
/*
* Just make sure we include the prototype for strptime as well
* (needed for glibc 2.2) but make sure we do this only if not
* yet defined.
*/
#ifndef __USE_XOPEN
# define __USE_XOPEN
#endif
#include <time.h>
#include <glib.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_GETOPT_H
#include <getopt.h>
#endif
#include <wiretap/wtap.h>
#include "epan/etypes.h"
#ifndef HAVE_GETOPT_LONG
#include "wsutil/wsgetopt.h"
#endif
#ifdef _WIN32
#include <wsutil/unicode-utils.h>
#include <process.h> /* getpid */
#include <winsock2.h>
#endif
#ifndef HAVE_STRPTIME
# include "wsutil/strptime.h"
#endif
#include <wsutil/crash_info.h>
#include <wsutil/clopts_common.h>
#include <wsutil/cmdarg_err.h>
#include <wsutil/filesystem.h>
#include <wsutil/file_util.h>
#include <wsutil/wsgcrypt.h>
#include <wsutil/plugins.h>
#include <wsutil/privileges.h>
#include <wsutil/report_message.h>
#include <wsutil/strnatcmp.h>
#include <wsutil/str_util.h>
#include <version_info.h>
#include <wsutil/pint.h>
#include <wsutil/strtoi.h>
#include <wiretap/wtap_opttypes.h>
#include <wiretap/pcapng.h>
#include "ui/failure_message.h"
#include "ringbuffer.h" /* For RINGBUFFER_MAX_NUM_FILES */
#define INVALID_OPTION 1
#define INVALID_FILE 2
#define CANT_EXTRACT_PREFIX 2
#define WRITE_ERROR 2
#define DUMP_ERROR 2
/*
* Some globals so we can pass things to various routines
*/
struct select_item {
gboolean inclusive;
guint first, second;
};
/*
* Duplicate frame detection
*/
typedef struct _fd_hash_t {
guint8 digest[16];
guint32 len;
nstime_t frame_time;
} fd_hash_t;
#define DEFAULT_DUP_DEPTH 5 /* Used with -d */
#define MAX_DUP_DEPTH 1000000 /* the maximum window (and actual size of fd_hash[]) for de-duplication */
static fd_hash_t fd_hash[MAX_DUP_DEPTH];
static int dup_window = DEFAULT_DUP_DEPTH;
static int cur_dup_entry = 0;
static guint32 ignored_bytes = 0; /* Used with -I */
#define ONE_BILLION 1000000000
/* Weights of different errors we can introduce */
/* We should probably make these command-line arguments */
/* XXX - Should we add a bit-level error? */
#define ERR_WT_BIT 5 /* Flip a random bit */
#define ERR_WT_BYTE 5 /* Substitute a random byte */
#define ERR_WT_ALNUM 5 /* Substitute a random character in [A-Za-z0-9] */
#define ERR_WT_FMT 2 /* Substitute "%s" */
#define ERR_WT_AA 1 /* Fill the remainder of the buffer with 0xAA */
#define ERR_WT_TOTAL (ERR_WT_BIT + ERR_WT_BYTE + ERR_WT_ALNUM + ERR_WT_FMT + ERR_WT_AA)
#define ALNUM_CHARS "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"
#define ALNUM_LEN (sizeof(ALNUM_CHARS) - 1)
struct time_adjustment {
nstime_t tv;
int is_negative;
};
typedef struct _chop_t {
int len_begin;
int off_begin_pos;
int off_begin_neg;
int len_end;
int off_end_pos;
int off_end_neg;
} chop_t;
/* Table of user comments */
GTree *frames_user_comments = NULL;
#define MAX_SELECTIONS 512
static struct select_item selectfrm[MAX_SELECTIONS];
static guint max_selected = 0;
static int keep_em = 0;
#ifdef PCAP_NG_DEFAULT
static int out_file_type_subtype = WTAP_FILE_TYPE_SUBTYPE_PCAPNG; /* default to pcapng */
#else
static int out_file_type_subtype = WTAP_FILE_TYPE_SUBTYPE_PCAP; /* default to pcap */
#endif
static int out_frame_type = -2; /* Leave frame type alone */
static int verbose = 0; /* Not so verbose */
static struct time_adjustment time_adj = {{0, 0}, 0}; /* no adjustment */
static nstime_t relative_time_window = {0, 0}; /* de-dup time window */
static double err_prob = 0.0;
static time_t starttime = 0;
static time_t stoptime = 0;
static gboolean check_startstop = FALSE;
static gboolean rem_vlan = FALSE;
static gboolean dup_detect = FALSE;
static gboolean dup_detect_by_time = FALSE;
static int do_strict_time_adjustment = FALSE;
static struct time_adjustment strict_time_adj = {{0, 0}, 0}; /* strict time adjustment */
static nstime_t previous_time = {0, 0}; /* previous time */
static int find_dct2000_real_data(guint8 *buf);
static void handle_chopping(chop_t chop, wtap_packet_header *out_phdr,
const wtap_packet_header *in_phdr, guint8 **buf,
gboolean adjlen);
static gchar *
abs_time_to_str_with_sec_resolution(const nstime_t *abs_time)
{
struct tm *tmp;
gchar *buf = (gchar *)g_malloc(16);
tmp = localtime(&abs_time->secs);
if (tmp) {
g_snprintf(buf, 16, "%d%02d%02d%02d%02d%02d",
tmp->tm_year + 1900,
tmp->tm_mon+1,
tmp->tm_mday,
tmp->tm_hour,
tmp->tm_min,
tmp->tm_sec);
} else {
buf[0] = '\0';
}
return buf;
}
static gchar *
fileset_get_filename_by_pattern(guint idx, const wtap_rec *rec,
gchar *fprefix, gchar *fsuffix)
{
gchar filenum[5+1];
gchar *timestr;
gchar *abs_str;
g_snprintf(filenum, sizeof(filenum), "%05u", idx % RINGBUFFER_MAX_NUM_FILES);
if (rec->presence_flags & WTAP_HAS_TS) {
timestr = abs_time_to_str_with_sec_resolution(&rec->ts);
abs_str = g_strconcat(fprefix, "_", filenum, "_", timestr, fsuffix, NULL);
g_free(timestr);
} else
abs_str = g_strconcat(fprefix, "_", filenum, fsuffix, NULL);
return abs_str;
}
static gboolean
fileset_extract_prefix_suffix(const char *fname, gchar **fprefix, gchar **fsuffix)
{
char *pfx, *last_pathsep;
gchar *save_file;
save_file = g_strdup(fname);
if (save_file == NULL) {
fprintf(stderr, "editcap: Out of memory\n");
return FALSE;
}
last_pathsep = strrchr(save_file, G_DIR_SEPARATOR);
pfx = strrchr(save_file,'.');
if (pfx != NULL && (last_pathsep == NULL || pfx > last_pathsep)) {
/* The pathname has a "." in it, and it's in the last component
* of the pathname (because there is either only one component,
* i.e. last_pathsep is null as there are no path separators,
* or the "." is after the path separator before the last
* component.
* Treat it as a separator between the rest of the file name and
* the file name suffix, and arrange that the names given to the
* ring buffer files have the specified suffix, i.e. put the
* changing part of the name *before* the suffix. */
pfx[0] = '\0';
*fprefix = g_strdup(save_file);
pfx[0] = '.'; /* restore capfile_name */
*fsuffix = g_strdup(pfx);
} else {
/* Either there's no "." in the pathname, or it's in a directory
* component, so the last component has no suffix. */
*fprefix = g_strdup(save_file);
*fsuffix = NULL;
}
g_free(save_file);
return TRUE;
}
/* Add a selection item, a simple parser for now */
static gboolean
add_selection(char *sel, guint* max_selection)
{
char *locn;
char *next;
if (max_selected >= MAX_SELECTIONS) {
/* Let the user know we stopped selecting */
fprintf(stderr, "Out of room for packet selections.\n");
return(FALSE);
}
if (verbose)
fprintf(stderr, "Add_Selected: %s\n", sel);
if ((locn = strchr(sel, '-')) == NULL) { /* No dash, so a single number? */
if (verbose)
fprintf(stderr, "Not inclusive ...");
selectfrm[max_selected].inclusive = FALSE;
selectfrm[max_selected].first = get_guint32(sel, "packet number");
if (selectfrm[max_selected].first > *max_selection)
*max_selection = selectfrm[max_selected].first;
if (verbose)
fprintf(stderr, " %u\n", selectfrm[max_selected].first);
} else {
if (verbose)
fprintf(stderr, "Inclusive ...");
*locn = '\0'; /* split the range */
next = locn + 1;
selectfrm[max_selected].inclusive = TRUE;
selectfrm[max_selected].first = get_guint32(sel, "beginning of packet range");
selectfrm[max_selected].second = get_guint32(next, "end of packet range");
if (selectfrm[max_selected].second == 0)
{
/* Not a valid number, presume all */
selectfrm[max_selected].second = *max_selection = G_MAXUINT;
}
else if (selectfrm[max_selected].second > *max_selection)
*max_selection = selectfrm[max_selected].second;
if (verbose)
fprintf(stderr, " %u, %u\n", selectfrm[max_selected].first,
selectfrm[max_selected].second);
}
max_selected++;
return(TRUE);
}
/* Was the packet selected? */
static int
selected(guint recno)
{
guint i;
for (i = 0; i < max_selected; i++) {
if (selectfrm[i].inclusive) {
if (selectfrm[i].first <= recno && selectfrm[i].second >= recno)
return 1;
} else {
if (recno == selectfrm[i].first)
return 1;
}
}
return 0;
}
static gboolean
set_time_adjustment(char *optarg_str_p)
{
char *frac, *end;
long val;
size_t frac_digits;
if (!optarg_str_p)
return TRUE;
/* skip leading whitespace */
while (*optarg_str_p == ' ' || *optarg_str_p == '\t')
optarg_str_p++;
/* check for a negative adjustment */
if (*optarg_str_p == '-') {
time_adj.is_negative = 1;
optarg_str_p++;
}
/* collect whole number of seconds, if any */
if (*optarg_str_p == '.') { /* only fractional (i.e., .5 is ok) */
val = 0;
frac = optarg_str_p;
} else {
val = strtol(optarg_str_p, &frac, 10);
if (frac == NULL || frac == optarg_str_p
|| val == LONG_MIN || val == LONG_MAX) {
fprintf(stderr, "editcap: \"%s\" isn't a valid time adjustment\n",
optarg_str_p);
return FALSE;
}
if (val < 0) { /* implies '--' since we caught '-' above */
fprintf(stderr, "editcap: \"%s\" isn't a valid time adjustment\n",
optarg_str_p);
return FALSE;
}
}
time_adj.tv.secs = val;
/* now collect the partial seconds, if any */
if (*frac != '\0') { /* chars left, so get fractional part */
val = strtol(&(frac[1]), &end, 10);
/* if more than 9 fractional digits truncate to 9 */
if ((end - &(frac[1])) > 9) {
frac[10] = 't'; /* 't' for truncate */
val = strtol(&(frac[1]), &end, 10);
}
if (*frac != '.' || end == NULL || end == frac || val < 0
|| val > ONE_BILLION || val == LONG_MIN || val == LONG_MAX) {
fprintf(stderr, "editcap: \"%s\" isn't a valid time adjustment\n",
optarg_str_p);
return FALSE;
}
} else {
return TRUE; /* no fractional digits */
}
/* adjust fractional portion from fractional to numerator
* e.g., in "1.5" from 5 to 500000000 since .5*10^9 = 500000000 */
frac_digits = end - frac - 1; /* fractional digit count (remember '.') */
while(frac_digits < 9) { /* this is frac of 10^9 */
val *= 10;
frac_digits++;
}
time_adj.tv.nsecs = (int)val;
return TRUE;
}
static gboolean
set_strict_time_adj(char *optarg_str_p)
{
char *frac, *end;
long val;
size_t frac_digits;
if (!optarg_str_p)
return TRUE;
/* skip leading whitespace */
while (*optarg_str_p == ' ' || *optarg_str_p == '\t')
optarg_str_p++;
/*
* check for a negative adjustment
* A negative strict adjustment value is a flag
* to adjust all frames by the specifed delta time.
*/
if (*optarg_str_p == '-') {
strict_time_adj.is_negative = 1;
optarg_str_p++;
}
/* collect whole number of seconds, if any */
if (*optarg_str_p == '.') { /* only fractional (i.e., .5 is ok) */
val = 0;
frac = optarg_str_p;
} else {
val = strtol(optarg_str_p, &frac, 10);
if (frac == NULL || frac == optarg_str_p
|| val == LONG_MIN || val == LONG_MAX) {
fprintf(stderr, "editcap: \"%s\" isn't a valid time adjustment\n",
optarg_str_p);
return FALSE;
}
if (val < 0) { /* implies '--' since we caught '-' above */
fprintf(stderr, "editcap: \"%s\" isn't a valid time adjustment\n",
optarg_str_p);
return FALSE;
}
}
strict_time_adj.tv.secs = val;
/* now collect the partial seconds, if any */
if (*frac != '\0') { /* chars left, so get fractional part */
val = strtol(&(frac[1]), &end, 10);
/* if more than 9 fractional digits truncate to 9 */
if ((end - &(frac[1])) > 9) {
frac[10] = 't'; /* 't' for truncate */
val = strtol(&(frac[1]), &end, 10);
}
if (*frac != '.' || end == NULL || end == frac || val < 0
|| val > ONE_BILLION || val == LONG_MIN || val == LONG_MAX) {
fprintf(stderr, "editcap: \"%s\" isn't a valid time adjustment\n",
optarg_str_p);
return FALSE;
}
} else {
return TRUE; /* no fractional digits */
}
/* adjust fractional portion from fractional to numerator
* e.g., in "1.5" from 5 to 500000000 since .5*10^9 = 500000000 */
frac_digits = end - frac - 1; /* fractional digit count (remember '.') */
while(frac_digits < 9) { /* this is frac of 10^9 */
val *= 10;
frac_digits++;
}
strict_time_adj.tv.nsecs = (int)val;
return TRUE;
}
static gboolean
set_rel_time(char *optarg_str_p)
{
char *frac, *end;
long val;
size_t frac_digits;
if (!optarg_str_p)
return TRUE;
/* skip leading whitespace */
while (*optarg_str_p == ' ' || *optarg_str_p == '\t')
optarg_str_p++;
/* ignore negative adjustment */
if (*optarg_str_p == '-')
optarg_str_p++;
/* collect whole number of seconds, if any */
if (*optarg_str_p == '.') { /* only fractional (i.e., .5 is ok) */
val = 0;
frac = optarg_str_p;
} else {
val = strtol(optarg_str_p, &frac, 10);
if (frac == NULL || frac == optarg_str_p
|| val == LONG_MIN || val == LONG_MAX) {
fprintf(stderr, "1: editcap: \"%s\" isn't a valid rel time value\n",
optarg_str_p);
return FALSE;
}
if (val < 0) { /* implies '--' since we caught '-' above */
fprintf(stderr, "2: editcap: \"%s\" isn't a valid rel time value\n",
optarg_str_p);
return FALSE;
}
}
relative_time_window.secs = val;
/* now collect the partial seconds, if any */
if (*frac != '\0') { /* chars left, so get fractional part */
val = strtol(&(frac[1]), &end, 10);
/* if more than 9 fractional digits truncate to 9 */
if ((end - &(frac[1])) > 9) {
frac[10] = 't'; /* 't' for truncate */
val = strtol(&(frac[1]), &end, 10);
}
if (*frac != '.' || end == NULL || end == frac || val < 0
|| val > ONE_BILLION || val == LONG_MIN || val == LONG_MAX) {
fprintf(stderr, "3: editcap: \"%s\" isn't a valid rel time value\n",
optarg_str_p);
return FALSE;
}
} else {
return TRUE; /* no fractional digits */
}
/* adjust fractional portion from fractional to numerator
* e.g., in "1.5" from 5 to 500000000 since .5*10^9 = 500000000 */
frac_digits = end - frac - 1; /* fractional digit count (remember '.') */
while(frac_digits < 9) { /* this is frac of 10^9 */
val *= 10;
frac_digits++;
}
relative_time_window.nsecs = (int)val;
return TRUE;
}
#define LINUX_SLL_OFFSETP 14
#define VLAN_SIZE 4
static void
sll_remove_vlan_info(guint8* fd, guint32* len) {
if (pntoh16(fd + LINUX_SLL_OFFSETP) == ETHERTYPE_VLAN) {
int rest_len;
/* point to start of vlan */
fd = fd + LINUX_SLL_OFFSETP;
/* bytes to read after vlan info */
rest_len = *len - (LINUX_SLL_OFFSETP + VLAN_SIZE);
/* remove vlan info from packet */
memmove(fd, fd + VLAN_SIZE, rest_len);
*len -= 4;
}
}
static void
remove_vlan_info(const wtap_packet_header *phdr, guint8* fd, guint32* len) {
switch (phdr->pkt_encap) {
case WTAP_ENCAP_SLL:
sll_remove_vlan_info(fd, len);
break;
default:
/* no support for current pkt_encap */
break;
}
}
static gboolean
is_duplicate(guint8* fd, guint32 len) {
int i;
/*Hint to ignore some bytes at the start of the frame for the digest calculation(-I option) */
guint32 offset = ignored_bytes;
guint32 new_len;
guint8 *new_fd;
if (len <= ignored_bytes) {
offset = 0;
}
new_fd = &fd[offset];
new_len = len - (offset);
cur_dup_entry++;
if (cur_dup_entry >= dup_window)
cur_dup_entry = 0;
/* Calculate our digest */
gcry_md_hash_buffer(GCRY_MD_MD5, fd_hash[cur_dup_entry].digest, new_fd, new_len);
fd_hash[cur_dup_entry].len = len;
/* Look for duplicates */
for (i = 0; i < dup_window; i++) {
if (i == cur_dup_entry)
continue;
if (fd_hash[i].len == fd_hash[cur_dup_entry].len
&& memcmp(fd_hash[i].digest, fd_hash[cur_dup_entry].digest, 16) == 0) {
return TRUE;
}
}
return FALSE;
}
static gboolean
is_duplicate_rel_time(guint8* fd, guint32 len, const nstime_t *current) {
int i;
/*Hint to ignore some bytes at the start of the frame for the digest calculation(-I option) */
guint32 offset = ignored_bytes;
guint32 new_len;
guint8 *new_fd;
if (len <= ignored_bytes) {
offset = 0;
}
new_fd = &fd[offset];
new_len = len - (offset);
cur_dup_entry++;
if (cur_dup_entry >= dup_window)
cur_dup_entry = 0;
/* Calculate our digest */
gcry_md_hash_buffer(GCRY_MD_MD5, fd_hash[cur_dup_entry].digest, new_fd, new_len);
fd_hash[cur_dup_entry].len = len;
fd_hash[cur_dup_entry].frame_time.secs = current->secs;
fd_hash[cur_dup_entry].frame_time.nsecs = current->nsecs;
/*
* Look for relative time related duplicates.
* This is hopefully a reasonably efficient mechanism for
* finding duplicates by rel time in the fd_hash[] cache.
* We check starting from the most recently added hash
* entries and work backwards towards older packets.
* This approach allows the dup test to be terminated
* when the relative time of a cached entry is found to
* be beyond the dup time window.
*
* Of course this assumes that the input trace file is
* "well-formed" in the sense that the packet timestamps are
* in strict chronologically increasing order (which is NOT
* always the case!!).
*
* The fd_hash[] table was deliberately created large (1,000,000).
* Looking for time related duplicates in large trace files with
* non-fractional dup time window values can potentially take
* a long time to complete.
*/
for (i = cur_dup_entry - 1;; i--) {
nstime_t delta;
int cmp;
if (i < 0)
i = dup_window - 1;
if (i == cur_dup_entry) {
/*
* We've decremented back to where we started.
* Check no more!
*/
break;
}
if (nstime_is_unset(&(fd_hash[i].frame_time))) {
/*
* We've decremented to an unused fd_hash[] entry.
* Check no more!
*/
break;
}
nstime_delta(&delta, current, &fd_hash[i].frame_time);
if (delta.secs < 0 || delta.nsecs < 0) {
/*
* A negative delta implies that the current packet
* has an absolute timestamp less than the cached packet
* that it is being compared to. This is NOT a normal
* situation since trace files usually have packets in
* chronological order (oldest to newest).
*
* There are several possible ways to deal with this:
* 1. 'continue' dup checking with the next cached frame.
* 2. 'break' from looking for a duplicate of the current frame.
* 3. Take the absolute value of the delta and see if that
* falls within the specifed dup time window.
*
* Currently this code does option 1. But it would pretty
* easy to add yet-another-editcap-option to select one of
* the other behaviors for dealing with out-of-sequence
* packets.
*/
continue;
}
cmp = nstime_cmp(&delta, &relative_time_window);
if (cmp > 0) {
/*
* The delta time indicates that we are now looking at
* cached packets beyond the specified dup time window.
* Check no more!
*/
break;
} else if (fd_hash[i].len == fd_hash[cur_dup_entry].len
&& memcmp(fd_hash[i].digest, fd_hash[cur_dup_entry].digest, 16) == 0) {
return TRUE;
}
}
return FALSE;
}
static void
print_usage(FILE *output)
{
fprintf(output, "\n");
fprintf(output, "Usage: editcap [options] ... <infile> <outfile> [ <packet#>[-<packet#>] ... ]\n");
fprintf(output, "\n");
fprintf(output, "<infile> and <outfile> must both be present.\n");
fprintf(output, "A single packet or a range of packets can be selected.\n");
fprintf(output, "\n");
fprintf(output, "Packet selection:\n");
fprintf(output, " -r keep the selected packets; default is to delete them.\n");
fprintf(output, " -A <start time> only output packets whose timestamp is after (or equal\n");
fprintf(output, " to) the given time (format as YYYY-MM-DD hh:mm:ss).\n");
fprintf(output, " -B <stop time> only output packets whose timestamp is before the\n");
fprintf(output, " given time (format as YYYY-MM-DD hh:mm:ss).\n");
fprintf(output, "\n");
fprintf(output, "Duplicate packet removal:\n");
fprintf(output, " --novlan remove vlan info from packets before checking for duplicates.\n");
fprintf(output, " -d remove packet if duplicate (window == %d).\n", DEFAULT_DUP_DEPTH);
fprintf(output, " -D <dup window> remove packet if duplicate; configurable <dup window>.\n");
fprintf(output, " Valid <dup window> values are 0 to %d.\n", MAX_DUP_DEPTH);
fprintf(output, " NOTE: A <dup window> of 0 with -v (verbose option) is\n");
fprintf(output, " useful to print MD5 hashes.\n");
fprintf(output, " -w <dup time window> remove packet if duplicate packet is found EQUAL TO OR\n");
fprintf(output, " LESS THAN <dup time window> prior to current packet.\n");
fprintf(output, " A <dup time window> is specified in relative seconds\n");
fprintf(output, " (e.g. 0.000001).\n");
fprintf(output, " -a <framenum>:<comment> Add or replace comment for given frame number\n");
fprintf(output, "\n");
fprintf(output, " -I <bytes to ignore> ignore the specified number of bytes at the beginning\n");
fprintf(output, " of the frame during MD5 hash calculation, unless the\n");
fprintf(output, " frame is too short, then the full frame is used.\n");
fprintf(output, " Useful to remove duplicated packets taken on\n");
fprintf(output, " several routers (different mac addresses for\n");
fprintf(output, " example).\n");
fprintf(output, " e.g. -I 26 in case of Ether/IP will ignore\n");
fprintf(output, " ether(14) and IP header(20 - 4(src ip) - 4(dst ip)).\n");
fprintf(output, "\n");
fprintf(output, " NOTE: The use of the 'Duplicate packet removal' options with\n");
fprintf(output, " other editcap options except -v may not always work as expected.\n");
fprintf(output, " Specifically the -r, -t or -S options will very likely NOT have the\n");
fprintf(output, " desired effect if combined with the -d, -D or -w.\n");
fprintf(output, "\n");
fprintf(output, "Packet manipulation:\n");
fprintf(output, " -s <snaplen> truncate each packet to max. <snaplen> bytes of data.\n");
fprintf(output, " -C [offset:]<choplen> chop each packet by <choplen> bytes. Positive values\n");
fprintf(output, " chop at the packet beginning, negative values at the\n");
fprintf(output, " packet end. If an optional offset precedes the length,\n");
fprintf(output, " then the bytes chopped will be offset from that value.\n");
fprintf(output, " Positive offsets are from the packet beginning,\n");
fprintf(output, " negative offsets are from the packet end. You can use\n");
fprintf(output, " this option more than once, allowing up to 2 chopping\n");
fprintf(output, " regions within a packet provided that at least 1\n");
fprintf(output, " choplen is positive and at least 1 is negative.\n");
fprintf(output, " -L adjust the frame (i.e. reported) length when chopping\n");
fprintf(output, " and/or snapping.\n");
fprintf(output, " -t <time adjustment> adjust the timestamp of each packet.\n");
fprintf(output, " <time adjustment> is in relative seconds (e.g. -0.5).\n");
fprintf(output, " -S <strict adjustment> adjust timestamp of packets if necessary to ensure\n");
fprintf(output, " strict chronological increasing order. The <strict\n");
fprintf(output, " adjustment> is specified in relative seconds with\n");
fprintf(output, " values of 0 or 0.000001 being the most reasonable.\n");
fprintf(output, " A negative adjustment value will modify timestamps so\n");
fprintf(output, " that each packet's delta time is the absolute value\n");
fprintf(output, " of the adjustment specified. A value of -0 will set\n");
fprintf(output, " all packets to the timestamp of the first packet.\n");
fprintf(output, " -E <error probability> set the probability (between 0.0 and 1.0 incl.) that\n");
fprintf(output, " a particular packet byte will be randomly changed.\n");
fprintf(output, " -o <change offset> When used in conjunction with -E, skip some bytes from the\n");
fprintf(output, " beginning of the packet. This allows one to preserve some\n");
fprintf(output, " bytes, in order to have some headers untouched.\n");
fprintf(output, "\n");
fprintf(output, "Output File(s):\n");
fprintf(output, " -c <packets per file> split the packet output to different files based on\n");
fprintf(output, " uniform packet counts with a maximum of\n");
fprintf(output, " <packets per file> each.\n");
fprintf(output, " -i <seconds per file> split the packet output to different files based on\n");
fprintf(output, " uniform time intervals with a maximum of\n");
fprintf(output, " <seconds per file> each.\n");
fprintf(output, " -F <capture type> set the output file type; default is pcapng. An empty\n");
fprintf(output, " \"-F\" option will list the file types.\n");
fprintf(output, " -T <encap type> set the output file encapsulation type; default is the\n");
fprintf(output, " same as the input file. An empty \"-T\" option will\n");
fprintf(output, " list the encapsulation types.\n");
fprintf(output, "\n");
fprintf(output, "Miscellaneous:\n");
fprintf(output, " -h display this help and exit.\n");
fprintf(output, " -v verbose output.\n");
fprintf(output, " If -v is used with any of the 'Duplicate Packet\n");
fprintf(output, " Removal' options (-d, -D or -w) then Packet lengths\n");
fprintf(output, " and MD5 hashes are printed to standard-error.\n");
}
struct string_elem {
const char *sstr; /* The short string */
const char *lstr; /* The long string */
};
static gint
string_compare(gconstpointer a, gconstpointer b)
{
return strcmp(((const struct string_elem *)a)->sstr,
((const struct string_elem *)b)->sstr);
}
static gint
string_nat_compare(gconstpointer a, gconstpointer b)
{
return ws_ascii_strnatcmp(((const struct string_elem *)a)->sstr,
((const struct string_elem *)b)->sstr);
}
static void
string_elem_print(gpointer data, gpointer stream_ptr)
{
fprintf((FILE *) stream_ptr, " %s - %s\n",
((struct string_elem *)data)->sstr,
((struct string_elem *)data)->lstr);
}
static void
list_capture_types(FILE *stream) {
int i;
struct string_elem *captypes;
GSList *list = NULL;
captypes = g_new(struct string_elem,WTAP_NUM_FILE_TYPES_SUBTYPES);
fprintf(stream, "editcap: The available capture file types for the \"-F\" flag are:\n");
for (i = 0; i < WTAP_NUM_FILE_TYPES_SUBTYPES; i++) {
if (wtap_dump_can_open(i)) {
captypes[i].sstr = wtap_file_type_subtype_short_string(i);
captypes[i].lstr = wtap_file_type_subtype_string(i);
list = g_slist_insert_sorted(list, &captypes[i], string_compare);
}
}
g_slist_foreach(list, string_elem_print, stream);
g_slist_free(list);
g_free(captypes);
}
static void
list_encap_types(FILE *stream) {
int i;
struct string_elem *encaps;
GSList *list = NULL;
encaps = (struct string_elem *)g_malloc(sizeof(struct string_elem) * WTAP_NUM_ENCAP_TYPES);
fprintf(stream, "editcap: The available encapsulation types for the \"-T\" flag are:\n");
for (i = 0; i < WTAP_NUM_ENCAP_TYPES; i++) {
encaps[i].sstr = wtap_encap_short_string(i);
if (encaps[i].sstr != NULL) {
encaps[i].lstr = wtap_encap_string(i);
list = g_slist_insert_sorted(list, &encaps[i], string_nat_compare);
}
}
g_slist_foreach(list, string_elem_print, stream);
g_slist_free(list);
g_free(encaps);
}
static int
framenum_compare(gconstpointer a, gconstpointer b, gpointer user_data _U_)
{
if (GPOINTER_TO_UINT(a) < GPOINTER_TO_UINT(b))
return -1;
if (GPOINTER_TO_UINT(a) > GPOINTER_TO_UINT(b))
return 1;
return 0;
}
/*
* General errors and warnings are reported with an console message
* in editcap.
*/
static void
failure_warning_message(const char *msg_format, va_list ap)
{
fprintf(stderr, "editcap: ");
vfprintf(stderr, msg_format, ap);
fprintf(stderr, "\n");
}
/*
* Report additional information for an error in command-line arguments.
*/
static void
failure_message_cont(const char *msg_format, va_list ap)
{
vfprintf(stderr, msg_format, ap);
fprintf(stderr, "\n");
}
static wtap_dumper *
editcap_dump_open(const char *filename, guint32 snaplen,
GArray* shb_hdrs,
wtapng_iface_descriptions_t *idb_inf,
GArray* nrb_hdrs, int *write_err)
{
wtap_dumper *pdh;
if (strcmp(filename, "-") == 0) {
/* Write to the standard output. */
pdh = wtap_dump_open_stdout_ng(out_file_type_subtype, out_frame_type,
snaplen, FALSE /* compressed */,
shb_hdrs, idb_inf, nrb_hdrs, write_err);
} else {
pdh = wtap_dump_open_ng(filename, out_file_type_subtype, out_frame_type,
snaplen, FALSE /* compressed */,
shb_hdrs, idb_inf, nrb_hdrs, write_err);
}
return pdh;
}
int
main(int argc, char *argv[])
{
GString *comp_info_str;
GString *runtime_info_str;
char *init_progfile_dir_error;
wtap *wth = NULL;
int i, j, read_err, write_err;
gchar *read_err_info, *write_err_info;
int opt;
static const struct option long_options[] = {
{"novlan", no_argument, NULL, 0x8100},
{"help", no_argument, NULL, 'h'},
{"version", no_argument, NULL, 'V'},
{0, 0, 0, 0 }
};
char *p;
guint32 snaplen = 0; /* No limit */
chop_t chop = {0, 0, 0, 0, 0, 0}; /* No chop */
gboolean adjlen = FALSE;
wtap_dumper *pdh = NULL;
unsigned int count = 1;
unsigned int duplicate_count = 0;
gint64 data_offset;
int err_type;
guint8 *buf;
guint32 read_count = 0;
guint32 split_packet_count = 0;
int written_count = 0;
char *filename = NULL;
gboolean ts_okay;
guint32 secs_per_block = 0;
int block_cnt = 0;
nstime_t block_start;
gchar *fprefix = NULL;
gchar *fsuffix = NULL;
guint32 change_offset = 0;
guint max_packet_number = 0;
const wtap_rec *rec;
wtap_rec temp_rec;
wtapng_iface_descriptions_t *idb_inf = NULL;
GArray *shb_hdrs = NULL;
GArray *nrb_hdrs = NULL;
char *shb_user_appl;
gboolean do_mutation;
guint32 caplen;
int ret = EXIT_SUCCESS;
cmdarg_err_init(failure_warning_message, failure_message_cont);
#ifdef _WIN32
arg_list_utf_16to8(argc, argv);
create_app_running_mutex();
#endif /* _WIN32 */
/* Get the compile-time version information string */
comp_info_str = get_compiled_version_info(NULL, NULL);
/* Get the run-time version information string */
runtime_info_str = get_runtime_version_info(NULL);
/* Add it to the information to be reported on a crash. */
ws_add_crash_info("Editcap (Wireshark) %s\n"
"\n"
"%s"
"\n"
"%s",
get_ws_vcs_version_info(), comp_info_str->str, runtime_info_str->str);
g_string_free(comp_info_str, TRUE);
g_string_free(runtime_info_str, TRUE);
/*
* 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], main);
if (init_progfile_dir_error != NULL) {
fprintf(stderr,
"editcap: Can't get pathname of directory containing the editcap program: %s.\n",
init_progfile_dir_error);
g_free(init_progfile_dir_error);
}
init_report_message(failure_warning_message, failure_warning_message,
NULL, NULL, NULL);
wtap_init(TRUE);
/* Process the options */
while ((opt = getopt_long(argc, argv, ":a:A:B:c:C:dD:E:F:hi:I:Lo:rs:S:t:T:vVw:", long_options, NULL)) != -1) {
switch (opt) {
case 0x8100:
{
rem_vlan = TRUE;
break;
}
case 'a':
{
guint frame_number;
gint string_start_index = 0;
if ((sscanf(optarg, "%u:%n", &frame_number, &string_start_index) < 1) || (string_start_index == 0)) {
fprintf(stderr, "editcap: \"%s\" isn't a valid <frame>:<comment>\n\n",
optarg);
ret = INVALID_OPTION;
goto clean_exit;
}
/* Lazily create the table */
if (!frames_user_comments) {
frames_user_comments = g_tree_new_full(framenum_compare, NULL, NULL, g_free);
}
/* Insert this entry (framenum -> comment) */
g_tree_replace(frames_user_comments, GUINT_TO_POINTER(frame_number), g_strdup(optarg+string_start_index));
break;
}
case 'A':
{
struct tm starttm;
memset(&starttm,0,sizeof(struct tm));
if (!strptime(optarg,"%Y-%m-%d %T", &starttm)) {
fprintf(stderr, "editcap: \"%s\" isn't a valid time format\n\n",
optarg);
ret = INVALID_OPTION;
goto clean_exit;
}
check_startstop = TRUE;
starttm.tm_isdst = -1;
starttime = mktime(&starttm);
break;
}
case 'B':
{
struct tm stoptm;
memset(&stoptm,0,sizeof(struct tm));
if (!strptime(optarg,"%Y-%m-%d %T", &stoptm)) {
fprintf(stderr, "editcap: \"%s\" isn't a valid time format\n\n",
optarg);
ret = INVALID_OPTION;
goto clean_exit;
}
check_startstop = TRUE;
stoptm.tm_isdst = -1;
stoptime = mktime(&stoptm);
break;
}
case 'c':
split_packet_count = get_nonzero_guint32(optarg, "packet count");
break;
case 'C':
{
int choplen = 0, chopoff = 0;
switch (sscanf(optarg, "%d:%d", &chopoff, &choplen)) {
case 1: /* only the chop length was specififed */
choplen = chopoff;
chopoff = 0;
break;
case 2: /* both an offset and chop length was specified */
break;
default:
fprintf(stderr, "editcap: \"%s\" isn't a valid chop length or offset:length\n",
optarg);
ret = INVALID_OPTION;
goto clean_exit;
break;
}
if (choplen > 0) {
chop.len_begin += choplen;
if (chopoff > 0)
chop.off_begin_pos += chopoff;
else
chop.off_begin_neg += chopoff;
} else if (choplen < 0) {
chop.len_end += choplen;
if (chopoff > 0)
chop.off_end_pos += chopoff;
else
chop.off_end_neg += chopoff;
}
break;
}
case 'd':
dup_detect = TRUE;
dup_detect_by_time = FALSE;
dup_window = DEFAULT_DUP_DEPTH;
break;
case 'D':
dup_detect = TRUE;
dup_detect_by_time = FALSE;
dup_window = get_guint32(optarg, "duplicate window");
if (dup_window > MAX_DUP_DEPTH) {
fprintf(stderr, "editcap: \"%d\" duplicate window value must be between 0 and %d inclusive.\n",
dup_window, MAX_DUP_DEPTH);
ret = INVALID_OPTION;
goto clean_exit;
}
break;
case 'E':
err_prob = g_ascii_strtod(optarg, &p);
if (p == optarg || err_prob < 0.0 || err_prob > 1.0) {
fprintf(stderr, "editcap: probability \"%s\" must be between 0.0 and 1.0\n",
optarg);
ret = INVALID_OPTION;
goto clean_exit;
}
srand( (unsigned int) (time(NULL) + ws_getpid()) );
break;
case 'F':
out_file_type_subtype = wtap_short_string_to_file_type_subtype(optarg);
if (out_file_type_subtype < 0) {
fprintf(stderr, "editcap: \"%s\" isn't a valid capture file type\n\n",
optarg);
list_capture_types(stderr);
ret = INVALID_OPTION;
goto clean_exit;
}
break;
case 'h':
printf("Editcap (Wireshark) %s\n"
"Edit and/or translate the format of capture files.\n"
"See https://www.wireshark.org for more information.\n",
get_ws_vcs_version_info());
print_usage(stdout);
goto clean_exit;
break;
case 'i': /* break capture file based on time interval */
secs_per_block = get_nonzero_guint32(optarg, "time interval");
break;
case 'I': /* ignored_bytes at the beginning of the frame for duplications removal */
ignored_bytes = get_guint32(optarg, "number of bytes to ignore");
break;
case 'L':
adjlen = TRUE;
break;
case 'o':
change_offset = get_guint32(optarg, "change offset");
break;
case 'r':
keep_em = !keep_em; /* Just invert */
break;
case 's':
snaplen = get_nonzero_guint32(optarg, "snapshot length");
break;
case 'S':
if (!set_strict_time_adj(optarg)) {
ret = INVALID_OPTION;
goto clean_exit;
}
do_strict_time_adjustment = TRUE;
break;
case 't':
if (!set_time_adjustment(optarg)) {
ret = INVALID_OPTION;
goto clean_exit;
}
break;
case 'T':
out_frame_type = wtap_short_string_to_encap(optarg);
if (out_frame_type < 0) {
fprintf(stderr, "editcap: \"%s\" isn't a valid encapsulation type\n\n",
optarg);
list_encap_types(stderr);
ret = INVALID_OPTION;
goto clean_exit;
}
break;
case 'v':
verbose = !verbose; /* Just invert */
break;
case 'V':
comp_info_str = get_compiled_version_info(NULL, NULL);
runtime_info_str = get_runtime_version_info(NULL);
show_version("Editcap (Wireshark)", comp_info_str, runtime_info_str);
g_string_free(comp_info_str, TRUE);
g_string_free(runtime_info_str, TRUE);
goto clean_exit;
break;
case 'w':
dup_detect = FALSE;
dup_detect_by_time = TRUE;
dup_window = MAX_DUP_DEPTH;
if (!set_rel_time(optarg)) {
ret = INVALID_OPTION;
goto clean_exit;
}
break;
case '?': /* Bad options if GNU getopt */
case ':': /* missing option argument */
switch(optopt) {
case'F':
list_capture_types(stdout);
break;
case'T':
list_encap_types(stdout);
break;
default:
if (opt == '?') {
fprintf(stderr, "editcap: invalid option -- '%c'\n", optopt);
} else {
fprintf(stderr, "editcap: option requires an argument -- '%c'\n", optopt);
}
print_usage(stderr);
ret = INVALID_OPTION;
break;
}
goto clean_exit;
break;
}
} /* processing commmand-line options */
#ifdef DEBUG
fprintf(stderr, "Optind = %i, argc = %i\n", optind, argc);
#endif
if ((argc - optind) < 1) {
print_usage(stderr);
ret = INVALID_OPTION;
goto clean_exit;
}
if (check_startstop && !stoptime) {
struct tm stoptm;
/* XXX: will work until 2035 */
memset(&stoptm,0,sizeof(struct tm));
stoptm.tm_year = 135;
stoptm.tm_mday = 31;
stoptm.tm_mon = 11;
stoptime = mktime(&stoptm);
}
nstime_set_unset(&block_start);
if (starttime > stoptime) {
fprintf(stderr, "editcap: start time is after the stop time\n");
ret = INVALID_OPTION;
goto clean_exit;
}
if (split_packet_count != 0 && secs_per_block != 0) {
fprintf(stderr, "editcap: can't split on both packet count and time interval\n");
fprintf(stderr, "editcap: at the same time\n");
ret = INVALID_OPTION;
goto clean_exit;
}
wth = wtap_open_offline(argv[optind], WTAP_TYPE_AUTO, &read_err, &read_err_info, FALSE);
if (!wth) {
cfile_open_failure_message("editcap", argv[optind], read_err,
read_err_info);
ret = INVALID_FILE;
goto clean_exit;
}
if (verbose) {
fprintf(stderr, "File %s is a %s capture file.\n", argv[optind],
wtap_file_type_subtype_string(wtap_file_type_subtype(wth)));
}
shb_hdrs = wtap_file_get_shb_for_new_file(wth);
idb_inf = wtap_file_get_idb_info(wth);
nrb_hdrs = wtap_file_get_nrb_for_new_file(wth);
/*
* Now, process the rest, if any ... we only write if there is an extra
* argument or so ...
*/
if ((argc - optind) >= 2) {
if (out_frame_type == -2)
out_frame_type = wtap_file_encap(wth);
for (i = optind + 2; i < argc; i++)
if (add_selection(argv[i], &max_packet_number) == FALSE)
break;
if (keep_em == FALSE)
max_packet_number = G_MAXUINT;
if (dup_detect || dup_detect_by_time) {
for (i = 0; i < dup_window; i++) {
memset(&fd_hash[i].digest, 0, 16);
fd_hash[i].len = 0;
nstime_set_unset(&fd_hash[i].frame_time);
}
}
/* Read all of the packets in turn */
while (wtap_read(wth, &read_err, &read_err_info, &data_offset)) {
if (max_packet_number <= read_count)
break;
read_count++;
rec = wtap_get_rec(wth);
/* Extra actions for the first packet */
if (read_count == 1) {
if (split_packet_count != 0 || secs_per_block != 0) {
if (!fileset_extract_prefix_suffix(argv[optind+1], &fprefix, &fsuffix)) {
ret = CANT_EXTRACT_PREFIX;
goto clean_exit;
}
filename = fileset_get_filename_by_pattern(block_cnt++, rec, fprefix, fsuffix);
} else {
filename = g_strdup(argv[optind+1]);
}
g_assert(filename);
/* If we don't have an application name add Editcap */
if (wtap_block_get_string_option_value(g_array_index(shb_hdrs, wtap_block_t, 0), OPT_SHB_USERAPPL, &shb_user_appl) != WTAP_OPTTYPE_SUCCESS) {
wtap_block_add_string_option_format(g_array_index(shb_hdrs, wtap_block_t, 0), OPT_SHB_USERAPPL, "Editcap " VERSION);
}
pdh = editcap_dump_open(filename,
snaplen ? MIN(snaplen, wtap_snapshot_length(wth)) : wtap_snapshot_length(wth),
shb_hdrs, idb_inf, nrb_hdrs, &write_err);
if (pdh == NULL) {
cfile_dump_open_failure_message("editcap", filename,
write_err,
out_file_type_subtype);
ret = INVALID_FILE;
goto clean_exit;
}
} /* first packet only handling */
buf = wtap_get_buf_ptr(wth);
/*
* Not all packets have time stamps. Only process the time
* stamp if we have one.
*/
if (rec->presence_flags & WTAP_HAS_TS) {
if (nstime_is_unset(&block_start)) {
block_start = rec->ts;
}
if (secs_per_block != 0) {
while (((guint32)(rec->ts.secs - block_start.secs) > secs_per_block)
|| ((guint32)(rec->ts.secs - block_start.secs) == secs_per_block
&& rec->ts.nsecs >= block_start.nsecs )) { /* time for the next file */
if (!wtap_dump_close(pdh, &write_err)) {
cfile_close_failure_message(filename, write_err);
ret = WRITE_ERROR;
goto clean_exit;
}
block_start.secs = block_start.secs + secs_per_block; /* reset for next interval */
g_free(filename);
filename = fileset_get_filename_by_pattern(block_cnt++, rec, fprefix, fsuffix);
g_assert(filename);
if (verbose)
fprintf(stderr, "Continuing writing in file %s\n", filename);
pdh = editcap_dump_open(filename,
snaplen ? MIN(snaplen, wtap_snapshot_length(wth)) : wtap_snapshot_length(wth),
shb_hdrs, idb_inf, nrb_hdrs, &write_err);
if (pdh == NULL) {
cfile_dump_open_failure_message("editcap", filename,
write_err,
out_file_type_subtype);
ret = INVALID_FILE;
goto clean_exit;
}
}
}
} /* time stamp handling */
if (split_packet_count != 0) {
/* time for the next file? */
if (written_count > 0 && (written_count % split_packet_count) == 0) {
if (!wtap_dump_close(pdh, &write_err)) {
cfile_close_failure_message(filename, write_err);
ret = WRITE_ERROR;
goto clean_exit;
}
g_free(filename);
filename = fileset_get_filename_by_pattern(block_cnt++, rec, fprefix, fsuffix);
g_assert(filename);
if (verbose)
fprintf(stderr, "Continuing writing in file %s\n", filename);
pdh = editcap_dump_open(filename,
snaplen ? MIN(snaplen, wtap_snapshot_length(wth)) : wtap_snapshot_length(wth),
shb_hdrs, idb_inf, nrb_hdrs, &write_err);
if (pdh == NULL) {
cfile_dump_open_failure_message("editcap", filename,
write_err,
out_file_type_subtype);
ret = INVALID_FILE;
goto clean_exit;
}
}
} /* split packet handling */
if (check_startstop) {
/*
* Is the packet in the selected timeframe?
* If the packet has no time stamp, the answer is "no".
*/
if (rec->presence_flags & WTAP_HAS_TS)
ts_okay = (rec->ts.secs >= starttime) && (rec->ts.secs < stoptime);
else
ts_okay = FALSE;
} else {
/*
* No selected timeframe, so all packets are "in the
* selected timeframe".
*/
ts_okay = TRUE;
}
if (ts_okay && ((!selected(count) && !keep_em)
|| (selected(count) && keep_em))) {
if (verbose && !dup_detect && !dup_detect_by_time)
fprintf(stderr, "Packet: %u\n", count);
/* We simply write it, perhaps after truncating it; we could
* do other things, like modify it. */
rec = wtap_get_rec(wth);
if (rec->presence_flags & WTAP_HAS_TS) {
/* Do we adjust timestamps to ensure strict chronological
* order? */
if (do_strict_time_adjustment) {
if (previous_time.secs || previous_time.nsecs) {
if (!strict_time_adj.is_negative) {
nstime_t current;
nstime_t delta;
current = rec->ts;
nstime_delta(&delta, &current, &previous_time);
if (delta.secs < 0 || delta.nsecs < 0) {
/*
* A negative delta indicates that the current packet
* has an absolute timestamp less than the previous packet
* that it is being compared to. This is NOT a normal
* situation since trace files usually have packets in
* chronological order (oldest to newest).
* Copy and change rather than modify
* returned rec.
*/
/* fprintf(stderr, "++out of order, need to adjust this packet!\n"); */
temp_rec = *rec;
temp_rec.ts.secs = previous_time.secs + strict_time_adj.tv.secs;
temp_rec.ts.nsecs = previous_time.nsecs;
if (temp_rec.ts.nsecs + strict_time_adj.tv.nsecs > ONE_BILLION) {
/* carry */
temp_rec.ts.secs++;
temp_rec.ts.nsecs += strict_time_adj.tv.nsecs - ONE_BILLION;
} else {
temp_rec.ts.nsecs += strict_time_adj.tv.nsecs;
}
rec = &temp_rec;
}
} else {
/*
* A negative strict time adjustment is requested.
* Unconditionally set each timestamp to previous
* packet's timestamp plus delta.
* Copy and change rather than modify returned
* rec.
*/
temp_rec = *rec;
temp_rec.ts.secs = previous_time.secs + strict_time_adj.tv.secs;
temp_rec.ts.nsecs = previous_time.nsecs;
if (temp_rec.ts.nsecs + strict_time_adj.tv.nsecs > ONE_BILLION) {
/* carry */
temp_rec.ts.secs++;
temp_rec.ts.nsecs += strict_time_adj.tv.nsecs - ONE_BILLION;
} else {
temp_rec.ts.nsecs += strict_time_adj.tv.nsecs;
}
rec = &temp_rec;
}
}
previous_time = rec->ts;
}
if (time_adj.tv.secs != 0) {
/* Copy and change rather than modify returned rec */
temp_rec = *rec;
if (time_adj.is_negative)
temp_rec.ts.secs -= time_adj.tv.secs;
else
temp_rec.ts.secs += time_adj.tv.secs;
rec = &temp_rec;
}
if (time_adj.tv.nsecs != 0) {
/* Copy and change rather than modify returned rec */
temp_rec = *rec;
if (time_adj.is_negative) { /* subtract */
if (temp_rec.ts.nsecs < time_adj.tv.nsecs) { /* borrow */
temp_rec.ts.secs--;
temp_rec.ts.nsecs += ONE_BILLION;
}
temp_rec.ts.nsecs -= time_adj.tv.nsecs;
} else { /* add */
if (temp_rec.ts.nsecs + time_adj.tv.nsecs > ONE_BILLION) {
/* carry */
temp_rec.ts.secs++;
temp_rec.ts.nsecs += time_adj.tv.nsecs - ONE_BILLION;
} else {
temp_rec.ts.nsecs += time_adj.tv.nsecs;
}
}
rec = &temp_rec;
}
} /* time stamp adjustment */
if (rec->rec_type == REC_TYPE_PACKET) {
if (snaplen != 0) {
/* Limit capture length to snaplen */
if (rec->rec_header.packet_header.caplen > snaplen) {
/* Copy and change rather than modify returned wtap_rec */
temp_rec = *rec;
temp_rec.rec_header.packet_header.caplen = snaplen;
rec = &temp_rec;
}
/* If -L, also set reported length to snaplen */
if (adjlen && rec->rec_header.packet_header.len > snaplen) {
/* Copy and change rather than modify returned phdr */
temp_rec = *rec;
temp_rec.rec_header.packet_header.len = snaplen;
rec = &temp_rec;
}
}
/*
* CHOP
* Copy and change rather than modify returned phdr.
*/
temp_rec = *rec;
handle_chopping(chop, &temp_rec.rec_header.packet_header,
&rec->rec_header.packet_header, &buf,
adjlen);
rec = &temp_rec;
/* remove vlan info */
if (rem_vlan) {
/* Copy and change rather than modify returned rec */
temp_rec = *rec;
remove_vlan_info(&rec->rec_header.packet_header, buf,
&temp_rec.rec_header.packet_header.caplen);
rec = &temp_rec;
}
/* suppress duplicates by packet window */
if (dup_detect) {
if (is_duplicate(buf, rec->rec_header.packet_header.caplen)) {
if (verbose) {
fprintf(stderr, "Skipped: %u, Len: %u, MD5 Hash: ",
count,
rec->rec_header.packet_header.caplen);
for (i = 0; i < 16; i++)
fprintf(stderr, "%02x",
(unsigned char)fd_hash[cur_dup_entry].digest[i]);
fprintf(stderr, "\n");
}
duplicate_count++;
count++;
continue;
} else {
if (verbose) {
fprintf(stderr, "Packet: %u, Len: %u, MD5 Hash: ",
count,
rec->rec_header.packet_header.caplen);
for (i = 0; i < 16; i++)
fprintf(stderr, "%02x",
(unsigned char)fd_hash[cur_dup_entry].digest[i]);
fprintf(stderr, "\n");
}
}
} /* suppression of duplicates */
if (rec->presence_flags & WTAP_HAS_TS) {
/* suppress duplicates by time window */
if (dup_detect_by_time) {
nstime_t current;
current.secs = rec->ts.secs;
current.nsecs = rec->ts.nsecs;
if (is_duplicate_rel_time(buf,
rec->rec_header.packet_header.caplen,
&current)) {
if (verbose) {
fprintf(stderr, "Skipped: %u, Len: %u, MD5 Hash: ",
count,
rec->rec_header.packet_header.caplen);
for (i = 0; i < 16; i++)
fprintf(stderr, "%02x",
(unsigned char)fd_hash[cur_dup_entry].digest[i]);
fprintf(stderr, "\n");
}
duplicate_count++;
count++;
continue;
} else {
if (verbose) {
fprintf(stderr, "Packet: %u, Len: %u, MD5 Hash: ",
count,
rec->rec_header.packet_header.caplen);
for (i = 0; i < 16; i++)
fprintf(stderr, "%02x",
(unsigned char)fd_hash[cur_dup_entry].digest[i]);
fprintf(stderr, "\n");
}
}
}
} /* suppress duplicates by time window */
}
/* Random error mutation */
do_mutation = FALSE;
caplen = 0;
if (err_prob > 0.0) {
switch (rec->rec_type) {
case REC_TYPE_PACKET:
caplen = rec->rec_header.packet_header.caplen;
do_mutation = TRUE;
break;
case REC_TYPE_SYSCALL:
caplen = rec->rec_header.syscall_header.event_filelen;
do_mutation = TRUE;
break;
}
if (change_offset > caplen) {
fprintf(stderr, "change offset %u is longer than caplen %u in packet %u\n",
change_offset, caplen, count);
do_mutation = FALSE;
}
}
if (do_mutation) {
int real_data_start = 0;
/* Protect non-protocol data */
switch (rec->rec_type) {
case REC_TYPE_PACKET:
if (wtap_file_type_subtype(wth) == WTAP_FILE_TYPE_SUBTYPE_CATAPULT_DCT2000)
real_data_start = find_dct2000_real_data(buf);
break;
}
real_data_start += change_offset;
for (i = real_data_start; i < (int) caplen; i++) {
if (rand() <= err_prob * RAND_MAX) {
err_type = rand() / (RAND_MAX / ERR_WT_TOTAL + 1);
if (err_type < ERR_WT_BIT) {
buf[i] ^= 1 << (rand() / (RAND_MAX / 8 + 1));
err_type = ERR_WT_TOTAL;
} else {
err_type -= ERR_WT_BYTE;
}
if (err_type < ERR_WT_BYTE) {
buf[i] = rand() / (RAND_MAX / 255 + 1);
err_type = ERR_WT_TOTAL;
} else {
err_type -= ERR_WT_BYTE;
}
if (err_type < ERR_WT_ALNUM) {
buf[i] = ALNUM_CHARS[rand() / (RAND_MAX / ALNUM_LEN + 1)];
err_type = ERR_WT_TOTAL;
} else {
err_type -= ERR_WT_ALNUM;
}
if (err_type < ERR_WT_FMT) {
if ((unsigned int)i < caplen - 2)
g_strlcpy((char*) &buf[i], "%s", 2);
err_type = ERR_WT_TOTAL;
} else {
err_type -= ERR_WT_FMT;
}
if (err_type < ERR_WT_AA) {
for (j = i; j < (int) caplen; j++)
buf[j] = 0xAA;
i = caplen;
}
}
}
} /* random error mutation */
/* Find a packet comment we may need to write */
if (frames_user_comments) {
const char *comment =
(const char*)g_tree_lookup(frames_user_comments, GUINT_TO_POINTER(read_count));
/* XXX: What about comment changed to no comment? */
if (comment != NULL) {
/* Copy and change rather than modify returned rec */
temp_rec = *rec;
temp_rec.opt_comment = g_strdup(comment);
temp_rec.has_comment_changed = TRUE;
rec = &temp_rec;
} else {
/* Copy and change rather than modify returned rec */
temp_rec = *rec;
temp_rec.has_comment_changed = FALSE;
rec = &temp_rec;
}
}
/* Attempt to dump out current frame to the output file */
if (!wtap_dump(pdh, rec, buf, &write_err, &write_err_info)) {
cfile_write_failure_message("editcap", argv[optind],
filename,
write_err, write_err_info,
read_count,
out_file_type_subtype);
ret = DUMP_ERROR;
goto clean_exit;
}
written_count++;
}
count++;
}
g_free(fprefix);
g_free(fsuffix);
if (read_err != 0) {
/* Print a message noting that the read failed somewhere along the
* line. */
cfile_read_failure_message("editcap", argv[optind], read_err,
read_err_info);
}
if (!pdh) {
/* No valid packages found, open the outfile so we can write an
* empty header */
g_free (filename);
filename = g_strdup(argv[optind+1]);
pdh = editcap_dump_open(filename,
snaplen ? MIN(snaplen, wtap_snapshot_length(wth)): wtap_snapshot_length(wth),
shb_hdrs, idb_inf, nrb_hdrs, &write_err);
if (pdh == NULL) {
cfile_dump_open_failure_message("editcap", filename,
write_err,
out_file_type_subtype);
ret = INVALID_FILE;
goto clean_exit;
}
}
if (!wtap_dump_close(pdh, &write_err)) {
cfile_close_failure_message(filename, write_err);
ret = WRITE_ERROR;
goto clean_exit;
}
g_free(filename);
if (frames_user_comments) {
g_tree_destroy(frames_user_comments);
}
}
if (dup_detect) {
fprintf(stderr, "%u packet%s seen, %u packet%s skipped with duplicate window of %i packets.\n",
count - 1, plurality(count - 1, "", "s"), duplicate_count,
plurality(duplicate_count, "", "s"), dup_window);
} else if (dup_detect_by_time) {
fprintf(stderr, "%u packet%s seen, %u packet%s skipped with duplicate time window equal to or less than %ld.%09ld seconds.\n",
count - 1, plurality(count - 1, "", "s"), duplicate_count,
plurality(duplicate_count, "", "s"),
(long)relative_time_window.secs,
(long int)relative_time_window.nsecs);
}
clean_exit:
wtap_block_array_free(shb_hdrs);
wtap_block_array_free(nrb_hdrs);
g_free(idb_inf);
if (wth != NULL)
wtap_close(wth);
wtap_cleanup();
free_progdirs();
return ret;
}
/* Skip meta-information read from file to return offset of real
* protocol data */
static int
find_dct2000_real_data(guint8 *buf)
{
int n = 0;
for (n = 0; buf[n] != '\0'; n++); /* Context name */
n++;
n++; /* Context port number */
for (; buf[n] != '\0'; n++); /* Timestamp */
n++;
for (; buf[n] != '\0'; n++); /* Protocol name */
n++;
for (; buf[n] != '\0'; n++); /* Variant number (as string) */
n++;
for (; buf[n] != '\0'; n++); /* Outhdr (as string) */
n++;
n += 2; /* Direction & encap */
return n;
}
/*
* We support up to 2 chopping regions in a single pass: one specified by the
* positive chop length, and one by the negative chop length.
*/
static void
handle_chopping(chop_t chop, wtap_packet_header *out_phdr,
const wtap_packet_header *in_phdr, guint8 **buf,
gboolean adjlen)
{
/* If we're not chopping anything from one side, then the offset for that
* side is meaningless. */
if (chop.len_begin == 0)
chop.off_begin_pos = chop.off_begin_neg = 0;
if (chop.len_end == 0)
chop.off_end_pos = chop.off_end_neg = 0;
if (chop.off_begin_neg < 0) {
chop.off_begin_pos += in_phdr->caplen + chop.off_begin_neg;
chop.off_begin_neg = 0;
}
if (chop.off_end_pos > 0) {
chop.off_end_neg += chop.off_end_pos - in_phdr->caplen;
chop.off_end_pos = 0;
}
/* If we've crossed chopping regions, swap them */
if (chop.len_begin && chop.len_end) {
if (chop.off_begin_pos > ((int)in_phdr->caplen + chop.off_end_neg)) {
int tmp_len, tmp_off;
tmp_off = in_phdr->caplen + chop.off_end_neg + chop.len_end;
tmp_len = -chop.len_end;
chop.off_end_neg = chop.len_begin + chop.off_begin_pos - in_phdr->caplen;
chop.len_end = -chop.len_begin;
chop.len_begin = tmp_len;
chop.off_begin_pos = tmp_off;
}
}
/* Make sure we don't chop off more than we have available */
if (in_phdr->caplen < (guint32)(chop.off_begin_pos - chop.off_end_neg)) {
chop.len_begin = 0;
chop.len_end = 0;
}
if ((guint32)(chop.len_begin - chop.len_end) >
(in_phdr->caplen - (guint32)(chop.off_begin_pos - chop.off_end_neg))) {
chop.len_begin = in_phdr->caplen - (chop.off_begin_pos - chop.off_end_neg);
chop.len_end = 0;
}
/* Handle chopping from the beginning. Note that if a beginning offset
* was specified, we need to keep that piece */
if (chop.len_begin > 0) {
*out_phdr = *in_phdr;
if (chop.off_begin_pos > 0) {
memmove(*buf + chop.off_begin_pos,
*buf + chop.off_begin_pos + chop.len_begin,
out_phdr->caplen - chop.len_begin);
} else {
*buf += chop.len_begin;
}
out_phdr->caplen -= chop.len_begin;
if (adjlen) {
if (in_phdr->len > (guint32)chop.len_begin)
out_phdr->len -= chop.len_begin;
else
out_phdr->len = 0;
}
in_phdr = out_phdr;
}
/* Handle chopping from the end. Note that if an ending offset was
* specified, we need to keep that piece */
if (chop.len_end < 0) {
*out_phdr = *in_phdr;
if (chop.off_end_neg < 0) {
memmove(*buf + (gint)out_phdr->caplen + (chop.len_end + chop.off_end_neg),
*buf + (gint)out_phdr->caplen + chop.off_end_neg,
-chop.off_end_neg);
}
out_phdr->caplen += chop.len_end;
if (adjlen) {
if (((signed int) in_phdr->len + chop.len_end) > 0)
out_phdr->len += chop.len_end;
else
out_phdr->len = 0;
}
/*in_phdr = out_phdr;*/
}
}
/*
* Editor modelines - http://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:
*/
View Git Blame Copy Permalink