xref: /freebsd-10.0-release/contrib/tcpdump/util.c

/*
 * Copyright (c) 1990, 1991, 1993, 1994, 1995, 1996, 1997
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that: (1) source code distributions
 * retain the above copyright notice and this paragraph in its entirety, (2)
 * distributions including binary code include the above copyright notice and
 * this paragraph in its entirety in the documentation or other materials
 * provided with the distribution, and (3) all advertising materials mentioning
 * features or use of this software display the following acknowledgement:
 * ``This product includes software developed by the University of California,
 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
 * the University nor the names of its contributors may be used to endorse
 * or promote products derived from this software without specific prior
 * written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#ifndef lint
static const char rcsid[] =
    "@(#) $Header: /tcpdump/master/tcpdump/util.c,v 1.72 2001/10/08 16:12:13 fenner Exp $ (LBL)";
#endif

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <sys/types.h>
#include <sys/time.h>
#include <sys/file.h>
#include <sys/stat.h>

#include <ctype.h>
#include <errno.h>
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif
#include <pcap.h>
#include <stdio.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#ifdef TIME_WITH_SYS_TIME
#include <time.h>
#endif
#include <unistd.h>

#include "interface.h"

/*
 * Print out a filename (or other ascii string).
 * If ep is NULL, assume no truncation check is needed.
 * Return true if truncated.
 */
int
fn_print(register const u_char *s, register const u_char *ep)
{
	register int ret;
	register u_char c;

	ret = 1;			/* assume truncated */
	while (ep == NULL || s < ep) {
		c = *s++;
		if (c == '\0') {
			ret = 0;
			break;
		}
		if (!isascii(c)) {
			c = toascii(c);
			putchar('M');
			putchar('-');
		}
		if (!isprint(c)) {
			c ^= 0x40;	/* DEL to ?, others to alpha */
			putchar('^');
		}
		putchar(c);
	}
	return(ret);
}

/*
 * Print out a counted filename (or other ascii string).
 * If ep is NULL, assume no truncation check is needed.
 * Return true if truncated.
 */
int
fn_printn(register const u_char *s, register u_int n,
	  register const u_char *ep)
{
	register int ret;
	register u_char c;

	ret = 1;			/* assume truncated */
	while (ep == NULL || s < ep) {
		if (n-- <= 0) {
			ret = 0;
			break;
		}
		c = *s++;
		if (!isascii(c)) {
			c = toascii(c);
			putchar('M');
			putchar('-');
		}
		if (!isprint(c)) {
			c ^= 0x40;	/* DEL to ?, others to alpha */
			putchar('^');
		}
		putchar(c);
	}
	return(ret);
}

/*
 * Print the timestamp
 */
void
ts_print(register const struct timeval *tvp)
{
	register int s;
	struct tm *tm;
	time_t Time;
	static unsigned b_sec;
	static unsigned b_usec;

	switch(tflag) {
	case 1: /* Default */
		s = (tvp->tv_sec + thiszone) % 86400;
		(void)printf("%02d:%02d:%02d.%06u ",
			     s / 3600, (s % 3600) / 60, s % 60,
			     (unsigned)tvp->tv_usec);
		break;
	case -1: /* Unix timeval style */
		(void)printf("%u.%06u ",
			     (unsigned)tvp->tv_sec,
			     (unsigned)tvp->tv_usec);
		break;
	case -2:
		if (b_sec == 0) {
			printf("000000 ");
		} else {
			int d_usec = tvp->tv_usec - b_usec;
			int d_sec = tvp->tv_sec - b_sec;

			while (d_usec < 0) {
				d_usec += 1000000;
				d_sec--;
			}
			if (d_sec)
				printf("%d. ", d_sec);
			printf("%06d ", d_usec);
		}
		b_sec = tvp->tv_sec;
		b_usec = tvp->tv_usec;
		break;
	case -3: /* Default + Date*/
		s = (tvp->tv_sec + thiszone) % 86400;
		Time = (tvp->tv_sec + thiszone) - s;
		tm  = gmtime (&Time);
		(void)printf("%02d/%02d/%04d %02d:%02d:%02d.%06u ",
			     tm->tm_mon+1, tm->tm_mday,
			     tm->tm_year+1900,
			     s / 3600, (s % 3600) / 60,
			     s % 60, (unsigned)tvp->tv_usec);
		break;
	}
}

/*
 * Print a relative number of seconds (e.g. hold time, prune timer)
 * in the form 5m1s.  This does no truncation, so 32230861 seconds
 * is represented as 1y1w1d1h1m1s.
 */
void
relts_print(int secs)
{
	static const char *lengths[] = {"y", "w", "d", "h", "m", "s"};
	static const int seconds[] = {31536000, 604800, 86400, 3600, 60, 1};
	const char **l = lengths;
	const int *s = seconds;

	if (secs == 0) {
		(void)printf("0s");
		return;
	}
	if (secs < 0) {
		(void)printf("-");
		secs = -secs;
	}
	while (secs > 0) {
		if (secs >= *s) {
			(void)printf("%d%s", secs / *s, *l);
			secs -= (secs / *s) * *s;
		}
		s++;
		l++;
	}
}

/*
 * Convert a token value to a string; use "fmt" if not found.
 */
const char *
tok2str(register const struct tok *lp, register const char *fmt,
	register int v)
{
	static char buf[128];

	while (lp->s != NULL) {
		if (lp->v == v)
			return (lp->s);
		++lp;
	}
	if (fmt == NULL)
		fmt = "#%d";
	(void)snprintf(buf, sizeof(buf), fmt, v);
	return (buf);
}

/*
 * Convert a value to a string using an array; the macro
 * tok2strary() in <interface.h> is the public interface to
 * this function and ensures that the second argument is
 * correct for bounds-checking.
 */
const char *
tok2strary_internal(register const char **lp, int n, register const char *fmt,
	register int v)
{
	static char buf[128];

	if (v >= 0 && v < n && lp[v] != NULL)
		return lp[v];
	if (fmt == NULL)
		fmt = "#%d";
	(void)snprintf(buf, sizeof(buf), fmt, v);
	return (buf);
}

/* VARARGS */
void
error(const char *fmt, ...)
{
	va_list ap;

	(void)fprintf(stderr, "%s: ", program_name);
	va_start(ap, fmt);
	(void)vfprintf(stderr, fmt, ap);
	va_end(ap);
	if (*fmt) {
		fmt += strlen(fmt);
		if (fmt[-1] != '\n')
			(void)fputc('\n', stderr);
	}
	exit(1);
	/* NOTREACHED */
}

/* VARARGS */
void
warning(const char *fmt, ...)
{
	va_list ap;

	(void)fprintf(stderr, "%s: WARNING: ", program_name);
	va_start(ap, fmt);
	(void)vfprintf(stderr, fmt, ap);
	va_end(ap);
	if (*fmt) {
		fmt += strlen(fmt);
		if (fmt[-1] != '\n')
			(void)fputc('\n', stderr);
	}
}

/*
 * Copy arg vector into a new buffer, concatenating arguments with spaces.
 */
char *
copy_argv(register char **argv)
{
	register char **p;
	register u_int len = 0;
	char *buf;
	char *src, *dst;

	p = argv;
	if (*p == 0)
		return 0;

	while (*p)
		len += strlen(*p++) + 1;

	buf = (char *)malloc(len);
	if (buf == NULL)
		error("copy_argv: malloc");

	p = argv;
	dst = buf;
	while ((src = *p++) != NULL) {
		while ((*dst++ = *src++) != '\0')
			;
		dst[-1] = ' ';
	}
	dst[-1] = '\0';

	return buf;
}

char *
read_infile(char *fname)
{
	register int fd, cc;
	register char *cp;
	struct stat buf;

	fd = open(fname, O_RDONLY);
	if (fd < 0)
		error("can't open %s: %s", fname, pcap_strerror(errno));

	if (fstat(fd, &buf) < 0)
		error("can't stat %s: %s", fname, pcap_strerror(errno));

	cp = malloc((u_int)buf.st_size + 1);
	if (cp == NULL)
		error("malloc(%d) for %s: %s", (u_int)buf.st_size + 1,
			fname, pcap_strerror(errno));
	cc = read(fd, cp, (u_int)buf.st_size);
	if (cc < 0)
		error("read %s: %s", fname, pcap_strerror(errno));
	if (cc != buf.st_size)
		error("short read %s (%d != %d)", fname, cc, (int)buf.st_size);
	cp[(int)buf.st_size] = '\0';

	return (cp);
}

void
safeputs(const char *s)
{
	while (*s) {
		safeputchar(*s);
		s++;
	}
}

void
safeputchar(int c)
{
	unsigned char ch;

	ch = (unsigned char)(c & 0xff);
	if (c < 0x80 && isprint(c))
		printf("%c", c & 0xff);
	else
		printf("\\%03o", c & 0xff);
}