The Tcpdump Group git mirrors - tcpdump/blob - util.c

   1 /*
   2  * Copyright (c) 1990, 1991, 1993, 1994, 1995, 1996, 1997
   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
  23 static const char rcsid[] =
  24     "@(#) $Header: /tcpdump/master/tcpdump/util.c,v 1.61 1999-11-22 07:25:27 fenner Exp $ (LBL)";
  25 #endif
  26
  27 #ifdef HAVE_CONFIG_H
  28 #include "config.h"
  29 #endif
  30
  31 #include <sys/types.h>
  32 #include <sys/time.h>
  33 #include <sys/file.h>
  34 #include <sys/stat.h>
  35
  36 #include <ctype.h>
  37 #include <errno.h>
  38 #ifdef HAVE_FCNTL_H
  39 #include <fcntl.h>
  40 #endif
  41 #ifdef HAVE_MALLOC_H
  42 #include <malloc.h>
  43 #endif
  44 #include <pcap.h>
  45 #include <stdio.h>
  46 #if __STDC__
  47 #include <stdarg.h>
  48 #else
  49 #include <varargs.h>
  50 #endif
  51 #include <stdlib.h>
  52 #include <string.h>
  53 #ifdef TIME_WITH_SYS_TIME
  54 #include <time.h>
  55 #endif
  56 #include <unistd.h>
  57
  58 #include "interface.h"
  59
  60 /*
  61  * Print out a filename (or other ascii string).
  62  * If ep is NULL, assume no truncation check is needed.
  63  * Return true if truncated.
  64  */
  65 int
  66 fn_print(register const u_char *s, register const u_char *ep)
  67 {
  68         register int ret;
  69         register u_char c;
  70
  71         ret = 1;                        /* assume truncated */
  72         while (ep == NULL || s < ep) {
  73                 c = *s++;
  74                 if (c == '\0') {
  75                         ret = 0;
  76                         break;
  77                 }
  78                 if (!isascii(c)) {
  79                         c = toascii(c);
  80                         putchar('M');
  81                         putchar('-');
  82                 }
  83                 if (!isprint(c)) {
  84                         c ^= 0x40;      /* DEL to ?, others to alpha */
  85                         putchar('^');
  86                 }
  87                 putchar(c);
  88         }
  89         return(ret);
  90 }
  91
  92 /*
  93  * Print out a counted filename (or other ascii string).
  94  * If ep is NULL, assume no truncation check is needed.
  95  * Return true if truncated.
  96  */
  97 int
  98 fn_printn(register const u_char *s, register u_int n,
  99           register const u_char *ep)
 100 {
 101         register int ret;
 102         register u_char c;
 103
 104         ret = 1;                        /* assume truncated */
 105         while (ep == NULL || s < ep) {
 106                 if (n-- <= 0) {
 107                         ret = 0;
 108                         break;
 109                 }
 110                 c = *s++;
 111                 if (!isascii(c)) {
 112                         c = toascii(c);
 113                         putchar('M');
 114                         putchar('-');
 115                 }
 116                 if (!isprint(c)) {
 117                         c ^= 0x40;      /* DEL to ?, others to alpha */
 118                         putchar('^');
 119                 }
 120                 putchar(c);
 121         }
 122         return(ret);
 123 }
 124
 125 /*
 126  * Print the timestamp
 127  */
 128 void
 129 ts_print(register const struct timeval *tvp)
 130 {
 131         register int s;
 132
 133         if (tflag > 0) {
 134                 /* Default */
 135                 s = (tvp->tv_sec + thiszone) % 86400;
 136                 (void)printf("%02d:%02d:%02d.%06u ",
 137                     s / 3600, (s % 3600) / 60, s % 60, (u_int32_t)tvp->tv_usec);
 138         } else if (tflag < 0) {
 139                 if (tflag < -1) {
 140                         static unsigned b_sec;
 141                         static unsigned b_usec;
 142                         if (b_sec == 0) {
 143                                 printf("000000 ");
 144                         } else {
 145                                 int d_usec = tvp->tv_usec - b_usec;
 146                                 int d_sec = tvp->tv_sec - b_sec;
 147
 148                                 while (d_usec < 0) {
 149                                         d_usec += 1000000;
 150                                         d_sec--;
 151                                 }
 152                                 if (d_sec)
 153                                         printf("%d. ", d_sec);
 154                                 printf("%06d ", d_usec);
 155                         }
 156                         b_sec = tvp->tv_sec;
 157                         b_usec = tvp->tv_usec;
 158                 } else {
 159                         /* Unix timeval style */
 160                         (void)printf("%u.%06u ",
 161                                      (u_int32_t)tvp->tv_sec, (u_int32_t)tvp->tv_usec);
 162                 }
 163         }
 164 }
 165
 166 /*
 167  * Print a relative number of seconds (e.g. hold time, prune timer)
 168  * in the form 5m1s.  This does no truncation, so 32230861 seconds
 169  * is represented as 1y1w1d1h1m1s.
 170  */
 171 void
 172 relts_print(int secs)
 173 {
 174     static char *lengths[]={"y","w","d","h","m","s"};
 175     static int seconds[]={31536000,604800,86400,3600,60,1};
 176     char **l = lengths;
 177     int *s = seconds;
 178     int len;
 179     int i;
 180
 181     if (secs == 0) {
 182         (void)printf("0s");
 183         return;
 184     }
 185     while (secs) {
 186         if (secs >= *s) {
 187             (void)printf("%d%s", secs / *s, *l);
 188             secs -= (secs / *s) * *s;
 189         }
 190         s++; l++;
 191     }
 192 }
 193
 194 /*
 195  * Convert a token value to a string; use "fmt" if not found.
 196  */
 197 const char *
 198 tok2str(register const struct tok *lp, register const char *fmt,
 199         register int v)
 200 {
 201         static char buf[128];
 202
 203         while (lp->s != NULL) {
 204                 if (lp->v == v)
 205                         return (lp->s);
 206                 ++lp;
 207         }
 208         if (fmt == NULL)
 209                 fmt = "#%d";
 210         (void)sprintf(buf, fmt, v);
 211         return (buf);
 212 }
 213
 214
 215 /* VARARGS */
 216 __dead void
 217 #if __STDC__
 218 error(const char *fmt, ...)
 219 #else
 220 error(fmt, va_alist)
 221         const char *fmt;
 222         va_dcl
 223 #endif
 224 {
 225         va_list ap;
 226
 227         (void)fprintf(stderr, "%s: ", program_name);
 228 #if __STDC__
 229         va_start(ap, fmt);
 230 #else
 231         va_start(ap);
 232 #endif
 233         (void)vfprintf(stderr, fmt, ap);
 234         va_end(ap);
 235         if (*fmt) {
 236                 fmt += strlen(fmt);
 237                 if (fmt[-1] != '\n')
 238                         (void)fputc('\n', stderr);
 239         }
 240         exit(1);
 241         /* NOTREACHED */
 242 }
 243
 244 /* VARARGS */
 245 void
 246 #if __STDC__
 247 warning(const char *fmt, ...)
 248 #else
 249 warning(fmt, va_alist)
 250         const char *fmt;
 251         va_dcl
 252 #endif
 253 {
 254         va_list ap;
 255
 256         (void)fprintf(stderr, "%s: WARNING: ", program_name);
 257 #if __STDC__
 258         va_start(ap, fmt);
 259 #else
 260         va_start(ap);
 261 #endif
 262         (void)vfprintf(stderr, fmt, ap);
 263         va_end(ap);
 264         if (*fmt) {
 265                 fmt += strlen(fmt);
 266                 if (fmt[-1] != '\n')
 267                         (void)fputc('\n', stderr);
 268         }
 269 }
 270
 271 /*
 272  * Copy arg vector into a new buffer, concatenating arguments with spaces.
 273  */
 274 char *
 275 copy_argv(register char **argv)
 276 {
 277         register char **p;
 278         register u_int len = 0;
 279         char *buf;
 280         char *src, *dst;
 281
 282         p = argv;
 283         if (*p == 0)
 284                 return 0;
 285
 286         while (*p)
 287                 len += strlen(*p++) + 1;
 288
 289         buf = (char *)malloc(len);
 290         if (buf == NULL)
 291                 error("copy_argv: malloc");
 292
 293         p = argv;
 294         dst = buf;
 295         while ((src = *p++) != NULL) {
 296                 while ((*dst++ = *src++) != '\0')
 297                         ;
 298                 dst[-1] = ' ';
 299         }
 300         dst[-1] = '\0';
 301
 302         return buf;
 303 }
 304
 305 char *
 306 read_infile(char *fname)
 307 {
 308         register int fd, cc;
 309         register char *cp;
 310         struct stat buf;
 311
 312         fd = open(fname, O_RDONLY);
 313         if (fd < 0)
 314                 error("can't open %s: %s", fname, pcap_strerror(errno));
 315
 316         if (fstat(fd, &buf) < 0)
 317                 error("can't stat %s: %s", fname, pcap_strerror(errno));
 318
 319         cp = malloc((u_int)buf.st_size + 1);
 320         cc = read(fd, cp, (int)buf.st_size);
 321         if (cc < 0)
 322                 error("read %s: %s", fname, pcap_strerror(errno));
 323         if (cc != buf.st_size)
 324                 error("short read %s (%d != %d)", fname, cc, (int)buf.st_size);
 325         cp[(int)buf.st_size] = '\0';
 326
 327         return (cp);
 328 }