util.c revision 26180 
1/*
2 * Copyright (c) 1990, 1991, 1993, 1994, 1995, 1996
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that: (1) source code distributions
7 * retain the above copyright notice and this paragraph in its entirety, (2)
8 * distributions including binary code include the above copyright notice and
9 * this paragraph in its entirety in the documentation or other materials
10 * provided with the distribution, and (3) all advertising materials mentioning
11 * features or use of this software display the following acknowledgement:
12 * ``This product includes software developed by the University of California,
13 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
14 * the University nor the names of its contributors may be used to endorse
15 * or promote products derived from this software without specific prior
16 * written permission.
17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
20 */
21
22#ifndef lint
23static const char rcsid[] =
24    "@(#) $Header: util.c,v 1.55 96/09/26 23:36:51 leres Exp $ (LBL)";
25#endif
26
27#include <sys/types.h>
28#include <sys/time.h>
29#include <sys/file.h>
30#include <sys/stat.h>
31
32#include <ctype.h>
33#include <errno.h>
34#ifdef HAVE_FCNTL_H
35#include <fcntl.h>
36#endif
37#include <pcap.h>
38#include <stdio.h>
39#if __STDC__
40#include <stdarg.h>
41#else
42#include <varargs.h>
43#endif
44#include <stdlib.h>
45#include <string.h>
46#ifdef TIME_WITH_SYS_TIME
47#include <time.h>
48#endif
49#include <unistd.h>
50
51#include "interface.h"
52
53/*
54 * Print out a filename (or other ascii string).
55 * If ep is NULL, assume no truncation check is needed.
56 * Return true if truncated.
57 */
58int
59fn_print(register const u_char *s, register const u_char *ep)
60{
61	register int ret;
62	register u_char c;
63
64	ret = 1;			/* assume truncated */
65	while (ep == NULL || s < ep) {
66		c = *s++;
67		if (c == '\0') {
68			ret = 0;
69			break;
70		}
71		if (!isascii(c)) {
72			c = toascii(c);
73			putchar('M');
74			putchar('-');
75		}
76		if (!isprint(c)) {
77			c ^= 0x40;	/* DEL to ?, others to alpha */
78			putchar('^');
79		}
80		putchar(c);
81	}
82	return(ret);
83}
84
85/*
86 * Print out a counted filename (or other ascii string).
87 * If ep is NULL, assume no truncation check is needed.
88 * Return true if truncated.
89 */
90int
91fn_printn(register const u_char *s, register u_int n,
92	  register const u_char *ep)
93{
94	register int ret;
95	register u_char c;
96
97	ret = 1;			/* assume truncated */
98	while (ep == NULL || s < ep) {
99		if (n-- <= 0) {
100			ret = 0;
101			break;
102		}
103		c = *s++;
104		if (!isascii(c)) {
105			c = toascii(c);
106			putchar('M');
107			putchar('-');
108		}
109		if (!isprint(c)) {
110			c ^= 0x40;	/* DEL to ?, others to alpha */
111			putchar('^');
112		}
113		putchar(c);
114	}
115	return(ret);
116}
117
118/*
119 * Print the timestamp
120 */
121void
122ts_print(register const struct timeval *tvp)
123{
124	register int s;
125
126	if (tflag > 0) {
127		/* Default */
128		s = (tvp->tv_sec + thiszone) % 86400;
129		(void)printf("%02d:%02d:%02d.%06u ",
130		    s / 3600, (s % 3600) / 60, s % 60, (u_int32_t)tvp->tv_usec);
131	} else if (tflag < 0) {
132		/* Unix timeval style */
133		(void)printf("%u.%06u ",
134		    (u_int32_t)tvp->tv_sec, (u_int32_t)tvp->tv_usec);
135	}
136}
137
138/*
139 * Convert a token value to a string; use "fmt" if not found.
140 */
141const char *
142tok2str(register const struct tok *lp, register const char *fmt,
143	register int v)
144{
145	static char buf[128];
146
147	while (lp->s != NULL) {
148		if (lp->v == v)
149			return (lp->s);
150		++lp;
151	}
152	if (fmt == NULL)
153		fmt = "#%d";
154	(void)sprintf(buf, fmt, v);
155	return (buf);
156}
157
158
159/* VARARGS */
160__dead void
161#if __STDC__
162error(const char *fmt, ...)
163#else
164error(fmt, va_alist)
165	const char *fmt;
166	va_dcl
167#endif
168{
169	va_list ap;
170
171	(void)fprintf(stderr, "%s: ", program_name);
172#if __STDC__
173	va_start(ap, fmt);
174#else
175	va_start(ap);
176#endif
177	(void)vfprintf(stderr, fmt, ap);
178	va_end(ap);
179	if (*fmt) {
180		fmt += strlen(fmt);
181		if (fmt[-1] != '\n')
182			(void)fputc('\n', stderr);
183	}
184	exit(1);
185	/* NOTREACHED */
186}
187
188/* VARARGS */
189void
190#if __STDC__
191warning(const char *fmt, ...)
192#else
193warning(fmt, va_alist)
194	const char *fmt;
195	va_dcl
196#endif
197{
198	va_list ap;
199
200	(void)fprintf(stderr, "%s: WARNING: ", program_name);
201#if __STDC__
202	va_start(ap, fmt);
203#else
204	va_start(ap);
205#endif
206	(void)vfprintf(stderr, fmt, ap);
207	va_end(ap);
208	if (*fmt) {
209		fmt += strlen(fmt);
210		if (fmt[-1] != '\n')
211			(void)fputc('\n', stderr);
212	}
213}
214
215/*
216 * Copy arg vector into a new buffer, concatenating arguments with spaces.
217 */
218char *
219copy_argv(register char **argv)
220{
221	register char **p;
222	register u_int len = 0;
223	char *buf;
224	char *src, *dst;
225
226	p = argv;
227	if (*p == 0)
228		return 0;
229
230	while (*p)
231		len += strlen(*p++) + 1;
232
233	buf = (char *)malloc(len);
234	if (buf == NULL)
235		error("copy_argv: malloc");
236
237	p = argv;
238	dst = buf;
239	while ((src = *p++) != NULL) {
240		while ((*dst++ = *src++) != '\0')
241			;
242		dst[-1] = ' ';
243	}
244	dst[-1] = '\0';
245
246	return buf;
247}
248
249/* A replacement for strdup() that cuts down on malloc() overhead */
250char *
251savestr(register const char *str)
252{
253	register u_int size;
254	register char *p;
255	static char *strptr = NULL;
256	static u_int strsize = 0;
257
258	size = strlen(str) + 1;
259	if (size > strsize) {
260		strsize = 1024;
261		if (strsize < size)
262			strsize = size;
263		strptr = (char *)malloc(strsize);
264		if (strptr == NULL)
265			error("savestr: malloc");
266	}
267	(void)strcpy(strptr, str);
268	p = strptr;
269	strptr += size;
270	strsize -= size;
271	return (p);
272}
273
274char *
275read_infile(char *fname)
276{
277	register int fd, cc;
278	register char *cp;
279	struct stat buf;
280
281	fd = open(fname, O_RDONLY);
282	if (fd < 0)
283		error("can't open %s: %s", fname, pcap_strerror(errno));
284
285	if (fstat(fd, &buf) < 0)
286		error("can't stat %s: %s", fname, pcap_strerror(errno));
287
288	cp = malloc((u_int)buf.st_size + 1);
289	cc = read(fd, cp, (int)buf.st_size);
290	if (cc < 0)
291		error("read %s: %s", fname, pcap_strerror(errno));
292	if (cc != buf.st_size)
293		error("short read %s (%d != %d)", fname, cc, (int)buf.st_size);
294	cp[(int)buf.st_size] = '\0';
295
296	return (cp);
297}
298
299/*
300 * Returns the difference between gmt and local time in seconds.
301 * Use gmtime() and localtime() to keep things simple.
302 */
303int32_t
304gmt2local(void)
305{
306	register int dt, dir;
307	register struct tm *gmt, *loc;
308	time_t t;
309	struct tm sgmt;
310
311	t = time(NULL);
312	gmt = &sgmt;
313	*gmt = *gmtime(&t);
314	loc = localtime(&t);
315	dt = (loc->tm_hour - gmt->tm_hour) * 60 * 60 +
316	    (loc->tm_min - gmt->tm_min) * 60;
317
318	/*
319	 * If the year or julian day is different, we span 00:00 GMT
320	 * and must add or subtract a day. Check the year first to
321	 * avoid problems when the julian day wraps.
322	 */
323	dir = loc->tm_year - gmt->tm_year;
324	if (dir == 0)
325		dir = loc->tm_yday - gmt->tm_yday;
326	dt += dir * 24 * 60 * 60;
327
328	return (dt);
329}
330