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 1.64 2000-06-01 01:13:53 assar 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         struct tm *tm;
 133         time_t Time;
 134         static unsigned b_sec;
 135         static unsigned b_usec;
 136
 137         switch(tflag)
 138         {
 139                 case 1: /* Default */
 140                         s = (tvp->tv_sec + thiszone) % 86400;
 141                         (void)printf("%02d:%02d:%02d.%06u ",
 142                                      s / 3600, (s % 3600) / 60, s % 60,
 143                                      (unsigned)tvp->tv_usec);
 144                         break;
 145                 case -1: /* Unix timeval style */
 146                         (void)printf("%u.%06u ",
 147                                      (unsigned)tvp->tv_sec,
 148                                      (unsigned)tvp->tv_usec);
 149                         break;
 150                 case -2:
 151                         if (b_sec == 0) {
 152                                 printf("000000 ");
 153                         } else {
 154                                 int d_usec = tvp->tv_usec - b_usec;
 155                                 int d_sec = tvp->tv_sec - b_sec;
 156
 157                                 while (d_usec < 0) {
 158                                         d_usec += 1000000;
 159                                         d_sec--;
 160                                 }
 161                                 if (d_sec)
 162                                         printf("%d. ", d_sec);
 163                                 printf("%06d ", d_usec);
 164                         }
 165                         b_sec = tvp->tv_sec;
 166                         b_usec = tvp->tv_usec;
 167                         break;
 168                 case -3: /* Default + Date*/
 169                         s = (tvp->tv_sec + thiszone) % 86400;
 170                         time(&Time);
 171                         tm = localtime(&Time);
 172                         (void)printf("%02d/%02d/%04d %02d:%02d:%02d.%06u ",
 173                                      tm->tm_mon+1, tm->tm_mday,
 174                                      tm->tm_year+1900,
 175                                      s / 3600, (s % 3600) / 60,
 176                                      s % 60, (unsigned)tvp->tv_usec);
 177                         break;
 178         }
 179 }
 180
 181 /*
 182  * Print a relative number of seconds (e.g. hold time, prune timer)
 183  * in the form 5m1s.  This does no truncation, so 32230861 seconds
 184  * is represented as 1y1w1d1h1m1s.
 185  */
 186 void
 187 relts_print(int secs)
 188 {
 189     static char *lengths[]={"y","w","d","h","m","s"};
 190     static int seconds[]={31536000,604800,86400,3600,60,1};
 191     char **l = lengths;
 192     int *s = seconds;
 193
 194     if (secs == 0) {
 195         (void)printf("0s");
 196         return;
 197     }
 198     while (secs) {
 199         if (secs >= *s) {
 200             (void)printf("%d%s", secs / *s, *l);
 201             secs -= (secs / *s) * *s;
 202         }
 203         s++; l++;
 204     }
 205 }
 206
 207 /*
 208  * Convert a token value to a string; use "fmt" if not found.
 209  */
 210 const char *
 211 tok2str(register const struct tok *lp, register const char *fmt,
 212         register int v)
 213 {
 214         static char buf[128];
 215
 216         while (lp->s != NULL) {
 217                 if (lp->v == v)
 218                         return (lp->s);
 219                 ++lp;
 220         }
 221         if (fmt == NULL)
 222                 fmt = "#%d";
 223         (void)snprintf(buf, sizeof(buf), fmt, v);
 224         return (buf);
 225 }
 226
 227
 228 /* VARARGS */
 229 __dead void
 230 #if __STDC__
 231 error(const char *fmt, ...)
 232 #else
 233 error(fmt, va_alist)
 234         const char *fmt;
 235         va_dcl
 236 #endif
 237 {
 238         va_list ap;
 239
 240         (void)fprintf(stderr, "%s: ", program_name);
 241 #if __STDC__
 242         va_start(ap, fmt);
 243 #else
 244         va_start(ap);
 245 #endif
 246         (void)vfprintf(stderr, fmt, ap);
 247         va_end(ap);
 248         if (*fmt) {
 249                 fmt += strlen(fmt);
 250                 if (fmt[-1] != '\n')
 251                         (void)fputc('\n', stderr);
 252         }
 253         exit(1);
 254         /* NOTREACHED */
 255 }
 256
 257 /* VARARGS */
 258 void
 259 #if __STDC__
 260 warning(const char *fmt, ...)
 261 #else
 262 warning(fmt, va_alist)
 263         const char *fmt;
 264         va_dcl
 265 #endif
 266 {
 267         va_list ap;
 268
 269         (void)fprintf(stderr, "%s: WARNING: ", program_name);
 270 #if __STDC__
 271         va_start(ap, fmt);
 272 #else
 273         va_start(ap);
 274 #endif
 275         (void)vfprintf(stderr, fmt, ap);
 276         va_end(ap);
 277         if (*fmt) {
 278                 fmt += strlen(fmt);
 279                 if (fmt[-1] != '\n')
 280                         (void)fputc('\n', stderr);
 281         }
 282 }
 283
 284 /*
 285  * Copy arg vector into a new buffer, concatenating arguments with spaces.
 286  */
 287 char *
 288 copy_argv(register char **argv)
 289 {
 290         register char **p;
 291         register u_int len = 0;
 292         char *buf;
 293         char *src, *dst;
 294
 295         p = argv;
 296         if (*p == 0)
 297                 return 0;
 298
 299         while (*p)
 300                 len += strlen(*p++) + 1;
 301
 302         buf = (char *)malloc(len);
 303         if (buf == NULL)
 304                 error("copy_argv: malloc");
 305
 306         p = argv;
 307         dst = buf;
 308         while ((src = *p++) != NULL) {
 309                 while ((*dst++ = *src++) != '\0')
 310                         ;
 311                 dst[-1] = ' ';
 312         }
 313         dst[-1] = '\0';
 314
 315         return buf;
 316 }
 317
 318 char *
 319 read_infile(char *fname)
 320 {
 321         register int fd, cc;
 322         register char *cp;
 323         struct stat buf;
 324
 325         fd = open(fname, O_RDONLY);
 326         if (fd < 0)
 327                 error("can't open %s: %s", fname, pcap_strerror(errno));
 328
 329         if (fstat(fd, &buf) < 0)
 330                 error("can't stat %s: %s", fname, pcap_strerror(errno));
 331
 332         cp = malloc((u_int)buf.st_size + 1);
 333         cc = read(fd, cp, (int)buf.st_size);
 334         if (cc < 0)
 335                 error("read %s: %s", fname, pcap_strerror(errno));
 336         if (cc != buf.st_size)
 337                 error("short read %s (%d != %d)", fname, cc, (int)buf.st_size);
 338         cp[(int)buf.st_size] = '\0';
 339
 340         return (cp);
 341 }