![Guy Harris](/assets/img/avatar_default.png)
they have LF at the end of the line on UN*X and CR/LF on Windows; hopefully this means that if a CR/LF version is checked in on Windows, the CRs will be stripped so that they show up only when checked out on Windows, not on UN*X. svn path=/trunk/; revision=11400
469 lines
12 KiB
C
469 lines
12 KiB
C
/* Edit capture files. We can delete records, 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 <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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#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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/*
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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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#define ONE_MILLION 1000000
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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 count = 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 unsigned int snaplen = 0; /* No limit */
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static struct time_adjustment time_adj = {{0, 0}, 0}; /* no adjustment */
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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 record 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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/* An argument to the callback routine */
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typedef struct {
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char *filename;
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wtap_dumper *pdh;
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} callback_arg;
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/*
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*The callback routine that is called for each frame in the input file
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*/
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static void
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edit_callback(guchar *user, const struct wtap_pkthdr *phdr, long offset _U_,
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union wtap_pseudo_header *pseudo_header, const guchar *buf)
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{
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callback_arg *argp = (callback_arg *)user;
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int err;
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struct wtap_pkthdr snap_phdr;
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if ((!selected(count) && !keep_em) ||
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(selected(count) && keep_em)) {
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if (verbose)
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printf("Record: %u\n", count);
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/* We simply write it, perhaps after truncating it; we could do other
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things, like modify it. */
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if (snaplen != 0 && phdr->caplen > snaplen) {
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snap_phdr = *phdr;
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snap_phdr.caplen = snaplen;
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phdr = &snap_phdr;
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}
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/* assume that if the frame's tv_sec is 0, then
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* the timestamp isn't supported */
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if (phdr->ts.tv_sec > 0 && time_adj.tv.tv_sec != 0) {
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snap_phdr = *phdr;
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if (time_adj.is_negative)
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snap_phdr.ts.tv_sec -= time_adj.tv.tv_sec;
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else
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snap_phdr.ts.tv_sec += time_adj.tv.tv_sec;
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phdr = &snap_phdr;
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}
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/* assume that if the frame's tv_sec is 0, then
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* the timestamp isn't supported */
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if (phdr->ts.tv_sec > 0 && time_adj.tv.tv_usec != 0) {
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snap_phdr = *phdr;
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if (time_adj.is_negative) { /* subtract */
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if (snap_phdr.ts.tv_usec < time_adj.tv.tv_usec) { /* borrow */
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snap_phdr.ts.tv_sec--;
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snap_phdr.ts.tv_usec += ONE_MILLION;
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}
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snap_phdr.ts.tv_usec -= time_adj.tv.tv_usec;
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} else { /* add */
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if (snap_phdr.ts.tv_usec + time_adj.tv.tv_usec > ONE_MILLION) {
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/* carry */
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snap_phdr.ts.tv_sec++;
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snap_phdr.ts.tv_usec += time_adj.tv.tv_usec - ONE_MILLION;
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} else {
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snap_phdr.ts.tv_usec += time_adj.tv.tv_usec;
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}
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}
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phdr = &snap_phdr;
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}
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if (!wtap_dump(argp->pdh, phdr, pseudo_header, buf, &err)) {
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fprintf(stderr, "editcap: Error writing to %s: %s\n", argp->filename,
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wtap_strerror(err));
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exit(1);
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}
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}
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count++;
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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\" is not a valid ime 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\" is not 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\" is not 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 void usage(void)
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{
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int i;
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const char *string;
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fprintf(stderr, "Usage: editcap [-r] [-h] [-v] [-T <encap type>] [-F <capture type>]\n");
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fprintf(stderr, " [-s <snaplen>] [-t <time adjustment>]\n");
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fprintf(stderr, " <infile> <outfile> [ <record#>[-<record#>] ... ]\n");
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fprintf(stderr, " where\t-r specifies that the records specified should be kept, not deleted, \n");
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fprintf(stderr, " default is to delete\n");
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fprintf(stderr, " \t-v specifies verbose operation, default is silent\n");
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fprintf(stderr, " \t-h produces this help listing.\n");
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fprintf(stderr, " \t-T <encap type> specifies the encapsulation type to use:\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, " \t %s - %s\n",
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string, wtap_encap_string(i));
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}
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fprintf(stderr, " \t default is the same as the input file\n");
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fprintf(stderr, " \t-F <capture type> specifies the capture file type to write:\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, " \t %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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fprintf(stderr, " \t default is libpcap\n");
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fprintf(stderr, " \t-s <snaplen> specifies that packets should be truncated to\n");
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fprintf(stderr, " \t <snaplen> bytes of data\n");
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fprintf(stderr, " \t-t <time adjustment> specifies the time adjustment\n");
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fprintf(stderr, " \t to be applied to selected packets\n");
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fprintf(stderr, "\n \t A range of records can be specified as well\n");
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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, err;
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gchar *err_info;
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callback_arg args;
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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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int snapshot_length;
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/* Process the options first */
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while ((opt = getopt(argc, argv, "T:F:rvs:t:h")) !=-1) {
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switch (opt) {
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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\" is not a valid encapsulation type\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 '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\" is not a valid capture file type\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 'v':
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verbose = !verbose; /* Just invert */
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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\" is not 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 'h':
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usage();
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exit(1);
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break;
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case '?': /* Bad options if GNU getopt */
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usage();
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exit(1);
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break;
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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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wth = wtap_open_offline(argv[optind], &err, &err_info, FALSE);
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if (!wth) {
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fprintf(stderr, "editcap: Can't open %s: %s\n", argv[optind],
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wtap_strerror(err));
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switch (err) {
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case WTAP_ERR_UNSUPPORTED:
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case WTAP_ERR_UNSUPPORTED_ENCAP:
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case WTAP_ERR_BAD_RECORD:
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fprintf(stderr, "(%s)\n", err_info);
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g_free(err_info);
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break;
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}
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exit(1);
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}
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if (verbose) {
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fprintf(stderr, "File %s is a %s capture file.\n", argv[optind],
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wtap_file_type_string(wtap_file_type(wth)));
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}
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/*
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* Now, process the rest, if any ... we only write if there is an extra
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* argument or so ...
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*/
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if ((argc - optind) >= 2) {
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args.filename = argv[optind + 1];
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if (out_frame_type == -2)
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out_frame_type = wtap_file_encap(wth);
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snapshot_length = wtap_snapshot_length(wth);
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if (snapshot_length == 0) {
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/* Snapshot length of input file not known. */
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snapshot_length = WTAP_MAX_PACKET_SIZE;
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}
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args.pdh = wtap_dump_open(argv[optind + 1], out_file_type,
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out_frame_type, wtap_snapshot_length(wth), &err);
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if (args.pdh == NULL) {
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fprintf(stderr, "editcap: Can't open or create %s: %s\n", argv[optind+1],
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wtap_strerror(err));
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exit(1);
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}
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for (i = optind + 2; i < argc; i++)
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add_selection(argv[i]);
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if (!wtap_loop(wth, 0, edit_callback, (char *)&args, &err, &err_info)) {
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/* Print a message noting that the read failed somewhere along the line. */
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fprintf(stderr,
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"editcap: An error occurred while reading \"%s\": %s.\n",
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argv[optind], wtap_strerror(err));
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switch (err) {
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case WTAP_ERR_UNSUPPORTED:
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case WTAP_ERR_UNSUPPORTED_ENCAP:
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case WTAP_ERR_BAD_RECORD:
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fprintf(stderr, "(%s)\n", err_info);
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break;
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}
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}
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if (!wtap_dump_close(args.pdh, &err)) {
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fprintf(stderr, "editcap: Error writing to %s: %s\n", argv[2],
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wtap_strerror(err));
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exit(1);
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}
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}
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return 0;
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}
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