forked from osmocom/wireshark
779 lines
20 KiB
C
779 lines
20 KiB
C
/* Edit capture files. We can delete packets, adjust timestamps, or
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* simply convert from one format to another format.
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*
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* $Id$
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*
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* Originally written by Richard Sharpe.
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* Improved by Guy Harris.
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* Further improved by Richard Sharpe.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <glib.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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/*
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* Just make sure we include the prototype for strptime as well
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* (needed for glibc 2.2)
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*/
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#define __USE_XOPEN
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#include <time.h>
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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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#ifdef NEED_GETOPT_H
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#include "getopt.h"
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#endif
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#ifdef _WIN32
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#include <process.h> /* getpid */
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#endif
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#ifdef NEED_STRPTIME_H
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# include "strptime.h"
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#endif
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#include "epan/crypt-md5.h"
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#include "svnversion.h"
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/*
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* Some globals so we can pass things to various routines
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*/
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struct select_item {
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int inclusive;
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int first, second;
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};
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/*
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* Duplicate frame detection
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*/
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typedef struct _fd_hash_t {
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md5_byte_t digest[16];
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guint32 len;
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} fd_hash_t;
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#define DUP_DEPTH 5
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fd_hash_t fd_hash[DUP_DEPTH];
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int cur_dup = 0;
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#define ONE_MILLION 1000000
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/* Weights of different errors we can introduce */
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/* We should probably make these command-line arguments */
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/* XXX - Should we add a bit-level error? */
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#define ERR_WT_BIT 5 /* Flip a random bit */
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#define ERR_WT_BYTE 5 /* Substitute a random byte */
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#define ERR_WT_ALNUM 5 /* Substitute a random character in [A-Za-z0-9] */
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#define ERR_WT_FMT 2 /* Substitute "%s" */
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#define ERR_WT_AA 1 /* Fill the remainder of the buffer with 0xAA */
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#define ERR_WT_TOTAL (ERR_WT_BIT + ERR_WT_BYTE + ERR_WT_ALNUM + ERR_WT_FMT + ERR_WT_AA)
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#define ALNUM_CHARS "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"
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#define ALNUM_LEN (sizeof(ALNUM_CHARS) - 1)
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struct time_adjustment {
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struct timeval tv;
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int is_negative;
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};
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static struct select_item selectfrm[100];
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static int max_selected = -1;
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static int keep_em = 0;
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static int out_file_type = WTAP_FILE_PCAP; /* default to "libpcap" */
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static int out_frame_type = -2; /* Leave frame type alone */
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static int verbose = 0; /* Not so verbose */
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static struct time_adjustment time_adj = {{0, 0}, 0}; /* no adjustment */
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static double err_prob = 0.0;
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static time_t starttime = 0;
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static time_t stoptime = 0;
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static gboolean check_startstop = FALSE;
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static gboolean dup_detect = FALSE;
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/* Add a selection item, a simple parser for now */
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static void add_selection(char *sel)
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{
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char *locn;
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char *next;
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if (max_selected == (sizeof(selectfrm)/sizeof(struct select_item)) - 1)
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return;
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printf("Add_Selected: %s\n", sel);
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if ((locn = strchr(sel, '-')) == NULL) { /* No dash, so a single number? */
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printf("Not inclusive ...");
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max_selected++;
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selectfrm[max_selected].inclusive = 0;
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selectfrm[max_selected].first = atoi(sel);
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printf(" %i\n", selectfrm[max_selected].first);
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}
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else {
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printf("Inclusive ...");
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next = locn + 1;
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max_selected++;
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selectfrm[max_selected].inclusive = 1;
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selectfrm[max_selected].first = atoi(sel);
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selectfrm[max_selected].second = atoi(next);
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printf(" %i, %i\n", selectfrm[max_selected].first, selectfrm[max_selected].second);
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}
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}
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/* Was the packet selected? */
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static int selected(int recno)
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{
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int i = 0;
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for (i = 0; i<= max_selected; i++) {
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if (selectfrm[i].inclusive) {
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if (selectfrm[i].first <= recno && selectfrm[i].second >= recno)
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return 1;
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}
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else {
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if (recno == selectfrm[i].first)
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return 1;
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}
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}
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return 0;
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}
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/* is the packet in the selected timeframe */
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static gboolean check_timestamp(wtap *wth) {
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struct wtap_pkthdr* pkthdr = wtap_phdr(wth);
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return ( (time_t) pkthdr->ts.secs >= starttime ) && ( (time_t) pkthdr->ts.secs <= stoptime );
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}
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static void
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set_time_adjustment(char *optarg)
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{
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char *frac, *end;
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long val;
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int frac_digits;
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if (!optarg)
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return;
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/* skip leading whitespace */
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while (*optarg == ' ' || *optarg == '\t') {
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optarg++;
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}
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/* check for a negative adjustment */
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if (*optarg == '-') {
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time_adj.is_negative = 1;
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optarg++;
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}
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/* collect whole number of seconds, if any */
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if (*optarg == '.') { /* only fractional (i.e., .5 is ok) */
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val = 0;
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frac = optarg;
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} else {
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val = strtol(optarg, &frac, 10);
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if (frac == NULL || frac == optarg || val == LONG_MIN || val == LONG_MAX) {
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fprintf(stderr, "editcap: \"%s\" isn't a valid time adjustment\n",
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optarg);
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exit(1);
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}
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if (val < 0) { /* implies '--' since we caught '-' above */
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fprintf(stderr, "editcap: \"%s\" isn't a valid time adjustment\n",
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optarg);
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exit(1);
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}
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}
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time_adj.tv.tv_sec = val;
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/* now collect the partial seconds, if any */
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if (*frac != '\0') { /* chars left, so get fractional part */
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val = strtol(&(frac[1]), &end, 10);
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if (*frac != '.' || end == NULL || end == frac
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|| val < 0 || val > ONE_MILLION || val == LONG_MIN || val == LONG_MAX) {
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fprintf(stderr, "editcap: \"%s\" isn't a valid time adjustment\n",
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optarg);
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exit(1);
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}
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}
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else {
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return; /* no fractional digits */
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}
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/* adjust fractional portion from fractional to numerator
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* e.g., in "1.5" from 5 to 500000 since .5*10^6 = 500000 */
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if (frac && end) { /* both are valid */
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frac_digits = end - frac - 1; /* fractional digit count (remember '.') */
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while(frac_digits < 6) { /* this is frac of 10^6 */
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val *= 10;
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frac_digits++;
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}
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}
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time_adj.tv.tv_usec = val;
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}
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static gboolean
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is_duplicate(guint8* fd, guint32 len) {
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int i;
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md5_state_t ms;
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cur_dup++;
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if (cur_dup >= DUP_DEPTH)
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cur_dup = 0;
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/* Calculate our digest */
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md5_init(&ms);
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md5_append(&ms, fd, len);
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md5_finish(&ms, fd_hash[cur_dup].digest);
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fd_hash[cur_dup].len = len;
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/* Look for duplicates */
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for (i = 0; i < DUP_DEPTH; i++) {
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if (i == cur_dup)
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continue;
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if (fd_hash[i].len == fd_hash[cur_dup].len &&
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memcmp(fd_hash[i].digest, fd_hash[cur_dup].digest, 16) == 0) {
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return TRUE;
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}
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}
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return FALSE;
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}
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static void usage(void)
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{
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fprintf(stderr, "Editcap %s"
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#ifdef SVNVERSION
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" (" SVNVERSION ")"
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#endif
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"\n", VERSION);
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fprintf(stderr, "Edit and/or translate the format of capture files.\n");
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fprintf(stderr, "See http://www.wireshark.org for more information.\n");
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fprintf(stderr, "\n");
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fprintf(stderr, "Usage: editcap [options] ... <infile> <outfile> [ <packet#>[-<packet#>] ... ]\n");
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fprintf(stderr, "\n");
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fprintf(stderr, "A single packet or a range of packets can be selected.\n");
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fprintf(stderr, "\n");
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fprintf(stderr, "Packets:\n");
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fprintf(stderr, " -C <choplen> chop each packet at the end by <choplen> bytes\n");
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fprintf(stderr, " -d remove duplicate packets\n");
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fprintf(stderr, " -E <error probability> set the probability (between 0.0 and 1.0 incl.)\n");
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fprintf(stderr, " that a particular packet byte will be randomly changed\n");
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fprintf(stderr, " -r keep the selected packets, default is to delete them\n");
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fprintf(stderr, " -s <snaplen> truncate packets to max. <snaplen> bytes of data\n");
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fprintf(stderr, " -t <time adjustment> adjust the timestamp of selected packets,\n");
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fprintf(stderr, " <time adjustment> is in relative seconds (e.g. -0.5)\n");
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fprintf(stderr, " -A <start time> don't output packets whose timestamp is before the\n");
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fprintf(stderr, " given time (format as YYYY-MM-DD hh:mm:ss)\n");
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fprintf(stderr, " -B <stop time> don't output packets whose timestamp is after the\n");
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fprintf(stderr, " given time (format as YYYY-MM-DD hh:mm:ss)\n");
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fprintf(stderr, "\n");
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fprintf(stderr, "Output File(s):\n");
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fprintf(stderr, " -c <packets per file> split the packet output to different files,\n");
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fprintf(stderr, " with a maximum of <packets per file> each\n");
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fprintf(stderr, " -F <capture type> set the output file type, default is libpcap\n");
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fprintf(stderr, " an empty \"-F\" option will list the file types\n");
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fprintf(stderr, " -T <encap type> set the output file encapsulation type,\n");
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fprintf(stderr, " default is the same as the input file\n");
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fprintf(stderr, " an empty \"-T\" option will list the encapsulation types\n");
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fprintf(stderr, "\n");
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fprintf(stderr, "Miscellaneous:\n");
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fprintf(stderr, " -h display this help and exit\n");
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fprintf(stderr, " -v verbose output\n");
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fprintf(stderr, "\n");
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}
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static void list_capture_types(void) {
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int i;
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fprintf(stderr, "editcap: The available capture file types for \"F\":\n");
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for (i = 0; i < WTAP_NUM_FILE_TYPES; i++) {
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if (wtap_dump_can_open(i))
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fprintf(stderr, " %s - %s\n",
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wtap_file_type_short_string(i), wtap_file_type_string(i));
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}
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}
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static void list_encap_types(void) {
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int i;
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const char *string;
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fprintf(stderr, "editcap: The available encapsulation types for \"T\":\n");
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for (i = 0; i < WTAP_NUM_ENCAP_TYPES; i++) {
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string = wtap_encap_short_string(i);
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if (string != NULL)
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fprintf(stderr, " %s - %s\n",
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string, wtap_encap_string(i));
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}
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}
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int main(int argc, char *argv[])
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{
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wtap *wth;
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int i, j, err;
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gchar *err_info;
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extern char *optarg;
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extern int optind;
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int opt;
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char *p;
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unsigned int snaplen = 0; /* No limit */
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unsigned int choplen = 0; /* No chop */
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wtap_dumper *pdh;
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int count = 1;
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gint64 data_offset;
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struct wtap_pkthdr snap_phdr;
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const struct wtap_pkthdr *phdr;
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int err_type;
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guint8 *buf;
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int split_packet_count = 0;
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int written_count = 0;
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char *filename;
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/* Process the options first */
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while ((opt = getopt(argc, argv, "A:B:c:C:dE:F:hrs:t:T:v")) !=-1) {
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switch (opt) {
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case 'E':
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err_prob = strtod(optarg, &p);
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if (p == optarg || err_prob < 0.0 || err_prob > 1.0) {
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fprintf(stderr, "editcap: probability \"%s\" must be between 0.0 and 1.0\n",
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optarg);
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exit(1);
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}
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srand(time(NULL) + getpid());
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break;
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case 'F':
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out_file_type = wtap_short_string_to_file_type(optarg);
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if (out_file_type < 0) {
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fprintf(stderr, "editcap: \"%s\" isn't a valid capture file type\n\n",
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optarg);
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list_capture_types();
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exit(1);
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}
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break;
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case 'c':
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split_packet_count = strtol(optarg, &p, 10);
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if (p == optarg || *p != '\0') {
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fprintf(stderr, "editcap: \"%s\" isn't a valid packet count\n",
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optarg);
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exit(1);
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}
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if (split_packet_count <= 0) {
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fprintf(stderr, "editcap: \"%d\" packet count must be larger than zero\n",
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split_packet_count);
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exit(1);
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}
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break;
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case 'C':
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choplen = strtol(optarg, &p, 10);
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if (p == optarg || *p != '\0') {
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fprintf(stderr, "editcap: \"%s\" isn't a valid chop length\n",
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optarg);
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exit(1);
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}
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break;
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case 'd':
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dup_detect = TRUE;
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for (i = 0; i < DUP_DEPTH; i++) {
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memset(&fd_hash[i].digest, 0, 16);
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fd_hash[i].len = 0;
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}
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break;
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case '?': /* Bad options if GNU getopt */
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switch(optopt) {
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case'F':
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list_capture_types();
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break;
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case'T':
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list_encap_types();
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break;
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default:
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usage();
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}
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exit(1);
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break;
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case 'h':
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usage();
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exit(1);
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break;
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case 'r':
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keep_em = !keep_em; /* Just invert */
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break;
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case 's':
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snaplen = strtol(optarg, &p, 10);
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if (p == optarg || *p != '\0') {
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fprintf(stderr, "editcap: \"%s\" isn't a valid snapshot length\n",
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optarg);
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exit(1);
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}
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break;
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case 't':
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set_time_adjustment(optarg);
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break;
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case 'T':
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out_frame_type = wtap_short_string_to_encap(optarg);
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if (out_frame_type < 0) {
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fprintf(stderr, "editcap: \"%s\" isn't a valid encapsulation type\n\n",
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optarg);
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list_encap_types();
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exit(1);
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}
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break;
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case 'v':
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verbose = !verbose; /* Just invert */
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break;
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case 'A':
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{
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struct tm starttm;
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memset(&starttm,0,sizeof(struct tm));
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if(!strptime(optarg,"%F %T",&starttm)) {
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fprintf(stderr, "editcap: \"%s\" isn't a valid time format\n\n",
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optarg);
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exit(1);
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}
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check_startstop = TRUE;
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starttm.tm_isdst = -1;
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starttime = mktime(&starttm);
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break;
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}
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case 'B':
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{
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struct tm stoptm;
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memset(&stoptm,0,sizeof(struct tm));
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if(!strptime(optarg,"%F %T",&stoptm)) {
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fprintf(stderr, "editcap: \"%s\" isn't a valid time format\n\n",
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optarg);
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exit(1);
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}
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check_startstop = TRUE;
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stoptm.tm_isdst = -1;
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stoptime = mktime(&stoptm);
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break;
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}
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}
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}
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#ifdef DEBUG
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printf("Optind = %i, argc = %i\n", optind, argc);
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#endif
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if ((argc - optind) < 1) {
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usage();
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exit(1);
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}
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if (check_startstop && !stoptime) {
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struct tm stoptm;
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/* XXX: will work until 2035 */
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memset(&stoptm,0,sizeof(struct tm));
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stoptm.tm_year = 135;
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stoptm.tm_mday = 31;
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stoptm.tm_mon = 11;
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stoptime = mktime(&stoptm);
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}
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if (starttime > stoptime) {
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fprintf(stderr, "editcap: start time is after the stop time\n");
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exit(1);
|
|
}
|
|
|
|
wth = wtap_open_offline(argv[optind], &err, &err_info, FALSE);
|
|
|
|
if (!wth) {
|
|
fprintf(stderr, "editcap: Can't open %s: %s\n", argv[optind],
|
|
wtap_strerror(err));
|
|
switch (err) {
|
|
|
|
case WTAP_ERR_UNSUPPORTED:
|
|
case WTAP_ERR_UNSUPPORTED_ENCAP:
|
|
case WTAP_ERR_BAD_RECORD:
|
|
fprintf(stderr, "(%s)\n", err_info);
|
|
g_free(err_info);
|
|
break;
|
|
}
|
|
exit(1);
|
|
|
|
}
|
|
|
|
if (verbose) {
|
|
|
|
fprintf(stderr, "File %s is a %s capture file.\n", argv[optind],
|
|
wtap_file_type_string(wtap_file_type(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);
|
|
|
|
if (split_packet_count > 0) {
|
|
filename = (char *) malloc(strlen(argv[optind+1]) + 20);
|
|
if (!filename) {
|
|
exit(5);
|
|
}
|
|
sprintf(filename, "%s-%05d", argv[optind+1], 0);
|
|
} else {
|
|
filename = argv[optind+1];
|
|
}
|
|
|
|
pdh = wtap_dump_open(filename, out_file_type,
|
|
out_frame_type, wtap_snapshot_length(wth), FALSE /* compressed */, &err);
|
|
if (pdh == NULL) {
|
|
|
|
fprintf(stderr, "editcap: Can't open or create %s: %s\n", filename,
|
|
wtap_strerror(err));
|
|
exit(1);
|
|
|
|
}
|
|
|
|
for (i = optind + 2; i < argc; i++)
|
|
add_selection(argv[i]);
|
|
|
|
while (wtap_read(wth, &err, &err_info, &data_offset)) {
|
|
|
|
if (split_packet_count > 0 && (written_count % split_packet_count == 0)) {
|
|
if (!wtap_dump_close(pdh, &err)) {
|
|
|
|
fprintf(stderr, "editcap: Error writing to %s: %s\n", filename,
|
|
wtap_strerror(err));
|
|
exit(1);
|
|
}
|
|
|
|
sprintf(filename, "%s-%05d",argv[optind+1], count / split_packet_count);
|
|
|
|
if (verbose) {
|
|
fprintf(stderr, "Continuing writing in file %s\n", filename);
|
|
}
|
|
|
|
pdh = wtap_dump_open(filename, out_file_type,
|
|
out_frame_type, wtap_snapshot_length(wth), FALSE /* compressed */, &err);
|
|
if (pdh == NULL) {
|
|
|
|
fprintf(stderr, "editcap: Can't open or create %s: %s\n", filename,
|
|
wtap_strerror(err));
|
|
exit(1);
|
|
|
|
}
|
|
}
|
|
|
|
if ( ((check_startstop && check_timestamp(wth)) || (!check_startstop && !check_timestamp(wth))) && ((!selected(count) && !keep_em) ||
|
|
(selected(count) && keep_em)) ) {
|
|
|
|
if (verbose)
|
|
printf("Packet: %u\n", count);
|
|
|
|
/* We simply write it, perhaps after truncating it; we could do other
|
|
things, like modify it. */
|
|
|
|
phdr = wtap_phdr(wth);
|
|
|
|
if (choplen != 0 && phdr->caplen > choplen) {
|
|
snap_phdr = *phdr;
|
|
snap_phdr.caplen -= choplen;
|
|
phdr = &snap_phdr;
|
|
}
|
|
|
|
if (snaplen != 0 && phdr->caplen > snaplen) {
|
|
snap_phdr = *phdr;
|
|
snap_phdr.caplen = snaplen;
|
|
phdr = &snap_phdr;
|
|
}
|
|
|
|
/* assume that if the frame's tv_sec is 0, then
|
|
* the timestamp isn't supported */
|
|
if (phdr->ts.secs > 0 && time_adj.tv.tv_sec != 0) {
|
|
snap_phdr = *phdr;
|
|
if (time_adj.is_negative)
|
|
snap_phdr.ts.secs -= time_adj.tv.tv_sec;
|
|
else
|
|
snap_phdr.ts.secs += time_adj.tv.tv_sec;
|
|
phdr = &snap_phdr;
|
|
}
|
|
|
|
/* assume that if the frame's tv_sec is 0, then
|
|
* the timestamp isn't supported */
|
|
if (phdr->ts.secs > 0 && time_adj.tv.tv_usec != 0) {
|
|
snap_phdr = *phdr;
|
|
if (time_adj.is_negative) { /* subtract */
|
|
if (snap_phdr.ts.nsecs/1000 < time_adj.tv.tv_usec) { /* borrow */
|
|
snap_phdr.ts.secs--;
|
|
snap_phdr.ts.nsecs += ONE_MILLION * 1000;
|
|
}
|
|
snap_phdr.ts.nsecs -= time_adj.tv.tv_usec * 1000;
|
|
} else { /* add */
|
|
if (snap_phdr.ts.nsecs + time_adj.tv.tv_usec * 1000 > ONE_MILLION * 1000) {
|
|
/* carry */
|
|
snap_phdr.ts.secs++;
|
|
snap_phdr.ts.nsecs += (time_adj.tv.tv_usec - ONE_MILLION) * 1000;
|
|
} else {
|
|
snap_phdr.ts.nsecs += time_adj.tv.tv_usec * 1000;
|
|
}
|
|
}
|
|
phdr = &snap_phdr;
|
|
}
|
|
|
|
if (dup_detect) {
|
|
buf = wtap_buf_ptr(wth);
|
|
if (is_duplicate(buf, phdr->caplen)) {
|
|
if (verbose)
|
|
printf("Skipping duplicate: %u\n", count);
|
|
count++;
|
|
continue;
|
|
}
|
|
}
|
|
|
|
if (err_prob > 0.0) {
|
|
buf = wtap_buf_ptr(wth);
|
|
for (i = 0; i < (int) phdr->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 < phdr->caplen - 2)
|
|
strcpy((char*) &buf[i], "%s");
|
|
err_type = ERR_WT_TOTAL;
|
|
} else {
|
|
err_type -= ERR_WT_FMT;
|
|
}
|
|
|
|
if (err_type < ERR_WT_AA) {
|
|
for (j = i; j < (int) phdr->caplen; j++) {
|
|
buf[j] = 0xAA;
|
|
}
|
|
i = phdr->caplen;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!wtap_dump(pdh, phdr, wtap_pseudoheader(wth), wtap_buf_ptr(wth),
|
|
&err)) {
|
|
|
|
fprintf(stderr, "editcap: Error writing to %s: %s\n",
|
|
filename, wtap_strerror(err));
|
|
exit(1);
|
|
|
|
}
|
|
|
|
written_count++;
|
|
|
|
}
|
|
|
|
count++;
|
|
|
|
}
|
|
|
|
if (err != 0) {
|
|
/* Print a message noting that the read failed somewhere along the line. */
|
|
fprintf(stderr,
|
|
"editcap: An error occurred while reading \"%s\": %s.\n",
|
|
argv[optind], wtap_strerror(err));
|
|
switch (err) {
|
|
|
|
case WTAP_ERR_UNSUPPORTED:
|
|
case WTAP_ERR_UNSUPPORTED_ENCAP:
|
|
case WTAP_ERR_BAD_RECORD:
|
|
fprintf(stderr, "(%s)\n", err_info);
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!wtap_dump_close(pdh, &err)) {
|
|
|
|
fprintf(stderr, "editcap: Error writing to %s: %s\n", filename,
|
|
wtap_strerror(err));
|
|
exit(1);
|
|
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|