529 lines
12 KiB
C
529 lines
12 KiB
C
/*
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* Copyright (c) 1990, 1991, 1993, 1994, 1995, 1996, 1997
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that: (1) source code distributions
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* retain the above copyright notice and this paragraph in its entirety, (2)
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* distributions including binary code include the above copyright notice and
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* this paragraph in its entirety in the documentation or other materials
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* provided with the distribution, and (3) all advertising materials mentioning
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* features or use of this software display the following acknowledgement:
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* ``This product includes software developed by the University of California,
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* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
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* the University nor the names of its contributors may be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*/
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#ifndef lint
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static const char rcsid[] _U_ =
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"@(#) $Header: /tcpdump/master/tcpdump/util.c,v 1.95.2.5 2005/06/16 01:19:57 guy Exp $ (LBL)";
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#endif
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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 <tcpdump-stdinc.h>
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#include <sys/stat.h>
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#include <errno.h>
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#ifdef HAVE_FCNTL_H
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#include <fcntl.h>
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#endif
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#include <pcap.h>
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#include <stdio.h>
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#include <stdarg.h>
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#include <stdlib.h>
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#include <string.h>
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#include "interface.h"
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/*
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* Print out a null-terminated filename (or other ascii string).
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* If ep is NULL, assume no truncation check is needed.
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* Return true if truncated.
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*/
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int
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fn_print(register const u_char *s, register const u_char *ep)
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{
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register int ret;
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register u_char c;
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ret = 1; /* assume truncated */
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while (ep == NULL || s < ep) {
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c = *s++;
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if (c == '\0') {
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ret = 0;
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break;
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}
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if (!isascii(c)) {
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c = toascii(c);
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putchar('M');
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putchar('-');
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}
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if (!isprint(c)) {
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c ^= 0x40; /* DEL to ?, others to alpha */
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putchar('^');
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}
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putchar(c);
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}
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return(ret);
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}
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/*
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* Print out a counted filename (or other ascii string).
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* If ep is NULL, assume no truncation check is needed.
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* Return true if truncated.
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*/
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int
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fn_printn(register const u_char *s, register u_int n,
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register const u_char *ep)
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{
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register u_char c;
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while (n > 0 && (ep == NULL || s < ep)) {
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n--;
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c = *s++;
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if (!isascii(c)) {
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c = toascii(c);
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putchar('M');
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putchar('-');
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}
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if (!isprint(c)) {
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c ^= 0x40; /* DEL to ?, others to alpha */
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putchar('^');
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}
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putchar(c);
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}
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return (n == 0) ? 0 : 1;
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}
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/*
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* Print out a null-padded filename (or other ascii string).
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* If ep is NULL, assume no truncation check is needed.
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* Return true if truncated.
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*/
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int
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fn_printzp(register const u_char *s, register u_int n,
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register const u_char *ep)
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{
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register int ret;
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register u_char c;
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ret = 1; /* assume truncated */
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while (n > 0 && (ep == NULL || s < ep)) {
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n--;
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c = *s++;
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if (c == '\0') {
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ret = 0;
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break;
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}
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if (!isascii(c)) {
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c = toascii(c);
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putchar('M');
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putchar('-');
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}
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if (!isprint(c)) {
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c ^= 0x40; /* DEL to ?, others to alpha */
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putchar('^');
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}
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putchar(c);
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}
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return (n == 0) ? 0 : ret;
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}
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/*
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* Print the timestamp
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*/
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void
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ts_print(register const struct timeval *tvp)
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{
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register int s;
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struct tm *tm;
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time_t Time;
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static unsigned b_sec;
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static unsigned b_usec;
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switch (tflag) {
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case 0: /* Default */
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s = (tvp->tv_sec + thiszone) % 86400;
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(void)printf("%02d:%02d:%02d.%06u ",
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s / 3600, (s % 3600) / 60, s % 60,
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(unsigned)tvp->tv_usec);
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break;
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case 1: /* No time stamp */
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break;
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case 2: /* Unix timeval style */
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(void)printf("%u.%06u ",
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(unsigned)tvp->tv_sec,
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(unsigned)tvp->tv_usec);
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break;
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case 3: /* Microseconds since previous packet */
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if (b_sec == 0) {
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printf("000000 ");
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} else {
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int d_usec = tvp->tv_usec - b_usec;
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int d_sec = tvp->tv_sec - b_sec;
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while (d_usec < 0) {
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d_usec += 1000000;
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d_sec--;
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}
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if (d_sec)
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printf("%d. ", d_sec);
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printf("%06d ", d_usec);
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}
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b_sec = tvp->tv_sec;
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b_usec = tvp->tv_usec;
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break;
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case 4: /* Default + Date*/
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s = (tvp->tv_sec + thiszone) % 86400;
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Time = (tvp->tv_sec + thiszone) - s;
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tm = gmtime (&Time);
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if (!tm)
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printf("Date fail ");
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else
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printf("%04d-%02d-%02d ",
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tm->tm_year+1900, tm->tm_mon+1, tm->tm_mday);
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printf("%02d:%02d:%02d.%06u ",
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s / 3600, (s % 3600) / 60, s % 60, (unsigned)tvp->tv_usec);
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break;
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}
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}
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/*
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* Print a relative number of seconds (e.g. hold time, prune timer)
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* in the form 5m1s. This does no truncation, so 32230861 seconds
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* is represented as 1y1w1d1h1m1s.
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*/
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void
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relts_print(int secs)
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{
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static const char *lengths[] = {"y", "w", "d", "h", "m", "s"};
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static const int seconds[] = {31536000, 604800, 86400, 3600, 60, 1};
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const char **l = lengths;
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const int *s = seconds;
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if (secs == 0) {
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(void)printf("0s");
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return;
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}
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if (secs < 0) {
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(void)printf("-");
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secs = -secs;
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}
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while (secs > 0) {
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if (secs >= *s) {
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(void)printf("%d%s", secs / *s, *l);
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secs -= (secs / *s) * *s;
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}
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s++;
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l++;
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}
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}
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/*
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* this is a generic routine for printing unknown data;
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* we pass on the linefeed plus indentation string to
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* get a proper output - returns 0 on error
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*/
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int
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print_unknown_data(const u_char *cp,const char *ident,int len)
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{
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if (len < 0) {
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printf("%sDissector error: print_unknown_data called with negative length",
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ident);
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return(0);
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}
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if (snapend - cp < len)
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len = snapend - cp;
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if (len < 0) {
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printf("%sDissector error: print_unknown_data called with pointer past end of packet",
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ident);
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return(0);
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}
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hex_print(ident,cp,len);
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return(1); /* everything is ok */
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}
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/*
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* Convert a token value to a string; use "fmt" if not found.
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*/
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const char *
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tok2strbuf(register const struct tok *lp, register const char *fmt,
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register int v, char *buf, size_t bufsize)
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{
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if (lp != NULL) {
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while (lp->s != NULL) {
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if (lp->v == v)
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return (lp->s);
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++lp;
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}
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}
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if (fmt == NULL)
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fmt = "#%d";
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(void)snprintf(buf, bufsize, fmt, v);
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return (const char *)buf;
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}
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/*
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* Convert a token value to a string; use "fmt" if not found.
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*/
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const char *
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tok2str(register const struct tok *lp, register const char *fmt,
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register int v)
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{
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static char buf[4][128];
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static int idx = 0;
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char *ret;
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ret = buf[idx];
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idx = (idx+1) & 3;
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return tok2strbuf(lp, fmt, v, ret, sizeof(buf[0]));
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}
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/*
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* Convert a bit token value to a string; use "fmt" if not found.
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* this is useful for parsing bitfields, the output strings are comma seperated
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*/
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char *
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bittok2str(register const struct tok *lp, register const char *fmt,
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register int v)
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{
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static char buf[256]; /* our stringbuffer */
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int buflen=0;
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register int rotbit; /* this is the bit we rotate through all bitpositions */
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register int tokval;
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while (lp->s != NULL && lp != NULL) {
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tokval=lp->v; /* load our first value */
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rotbit=1;
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while (rotbit != 0) {
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/*
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* lets AND the rotating bit with our token value
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* and see if we have got a match
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*/
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if (tokval == (v&rotbit)) {
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/* ok we have found something */
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buflen+=snprintf(buf+buflen, sizeof(buf)-buflen, "%s, ",lp->s);
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break;
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}
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rotbit=rotbit<<1; /* no match - lets shift and try again */
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}
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lp++;
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}
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if (buflen != 0) { /* did we find anything */
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/* yep, set the the trailing zero 2 bytes before to eliminate the last comma & whitespace */
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buf[buflen-2] = '\0';
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return (buf);
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}
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else {
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/* bummer - lets print the "unknown" message as advised in the fmt string if we got one */
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if (fmt == NULL)
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fmt = "#%d";
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(void)snprintf(buf, sizeof(buf), fmt, v);
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return (buf);
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}
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}
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/*
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* Convert a value to a string using an array; the macro
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* tok2strary() in <interface.h> is the public interface to
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* this function and ensures that the second argument is
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* correct for bounds-checking.
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*/
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const char *
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tok2strary_internal(register const char **lp, int n, register const char *fmt,
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register int v)
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{
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static char buf[128];
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if (v >= 0 && v < n && lp[v] != NULL)
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return lp[v];
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if (fmt == NULL)
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fmt = "#%d";
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(void)snprintf(buf, sizeof(buf), fmt, v);
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return (buf);
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}
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/*
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* Convert a 32-bit netmask to prefixlen if possible
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* the function returns the prefix-len; if plen == -1
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* then conversion was not possible;
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*/
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int
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mask2plen (u_int32_t mask)
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{
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u_int32_t bitmasks[33] = {
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0x00000000,
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0x80000000, 0xc0000000, 0xe0000000, 0xf0000000,
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0xf8000000, 0xfc000000, 0xfe000000, 0xff000000,
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0xff800000, 0xffc00000, 0xffe00000, 0xfff00000,
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0xfff80000, 0xfffc0000, 0xfffe0000, 0xffff0000,
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0xffff8000, 0xffffc000, 0xffffe000, 0xfffff000,
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0xfffff800, 0xfffffc00, 0xfffffe00, 0xffffff00,
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0xffffff80, 0xffffffc0, 0xffffffe0, 0xfffffff0,
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0xfffffff8, 0xfffffffc, 0xfffffffe, 0xffffffff
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};
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int prefix_len = 32;
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/* let's see if we can transform the mask into a prefixlen */
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while (prefix_len >= 0) {
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if (bitmasks[prefix_len] == mask)
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break;
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prefix_len--;
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}
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return (prefix_len);
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}
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/* VARARGS */
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void
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error(const char *fmt, ...)
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{
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va_list ap;
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(void)fprintf(stderr, "%s: ", program_name);
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va_start(ap, fmt);
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(void)vfprintf(stderr, fmt, ap);
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va_end(ap);
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if (*fmt) {
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fmt += strlen(fmt);
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if (fmt[-1] != '\n')
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(void)fputc('\n', stderr);
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}
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exit(1);
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/* NOTREACHED */
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}
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/* VARARGS */
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void
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warning(const char *fmt, ...)
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{
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va_list ap;
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(void)fprintf(stderr, "%s: WARNING: ", program_name);
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va_start(ap, fmt);
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(void)vfprintf(stderr, fmt, ap);
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va_end(ap);
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if (*fmt) {
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fmt += strlen(fmt);
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if (fmt[-1] != '\n')
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(void)fputc('\n', stderr);
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}
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}
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/*
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* Copy arg vector into a new buffer, concatenating arguments with spaces.
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*/
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char *
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copy_argv(register char **argv)
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{
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register char **p;
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register u_int len = 0;
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char *buf;
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char *src, *dst;
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p = argv;
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if (*p == 0)
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return 0;
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while (*p)
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len += strlen(*p++) + 1;
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buf = (char *)malloc(len);
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if (buf == NULL)
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error("copy_argv: malloc");
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p = argv;
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dst = buf;
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while ((src = *p++) != NULL) {
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while ((*dst++ = *src++) != '\0')
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;
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dst[-1] = ' ';
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}
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dst[-1] = '\0';
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return buf;
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}
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/*
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* On Windows, we need to open the file in binary mode, so that
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* we get all the bytes specified by the size we get from "fstat()".
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* On UNIX, that's not necessary. O_BINARY is defined on Windows;
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* we define it as 0 if it's not defined, so it does nothing.
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*/
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#ifndef O_BINARY
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#define O_BINARY 0
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#endif
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char *
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read_infile(char *fname)
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{
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register int i, fd, cc;
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register char *cp;
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struct stat buf;
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fd = open(fname, O_RDONLY|O_BINARY);
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if (fd < 0)
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error("can't open %s: %s", fname, pcap_strerror(errno));
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if (fstat(fd, &buf) < 0)
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error("can't stat %s: %s", fname, pcap_strerror(errno));
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cp = malloc((u_int)buf.st_size + 1);
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if (cp == NULL)
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error("malloc(%d) for %s: %s", (u_int)buf.st_size + 1,
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fname, pcap_strerror(errno));
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cc = read(fd, cp, (u_int)buf.st_size);
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if (cc < 0)
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error("read %s: %s", fname, pcap_strerror(errno));
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if (cc != buf.st_size)
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error("short read %s (%d != %d)", fname, cc, (int)buf.st_size);
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close(fd);
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/* replace "# comment" with spaces */
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for (i = 0; i < cc; i++) {
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if (cp[i] == '#')
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while (i < cc && cp[i] != '\n')
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cp[i++] = ' ';
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}
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cp[cc] = '\0';
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return (cp);
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}
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void
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safeputs(const char *s)
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{
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while (*s) {
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safeputchar(*s);
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s++;
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}
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}
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void
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safeputchar(int c)
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{
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unsigned char ch;
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ch = (unsigned char)(c & 0xff);
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if (ch < 0x80 && isprint(ch))
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printf("%c", ch);
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else
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printf("\\%03o", ch);
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}
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