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 1.78 2002-08-02 04:22:11 guy Exp $ (LBL)";
  25 #endif
  26
  27 #ifdef HAVE_CONFIG_H
  28 #include "config.h"
  29 #endif
  30
  31 #include <tcpdump-stdinc.h>
  32
  33 #include <sys/stat.h>
  34
  35 #include <errno.h>
  36 #ifdef HAVE_FCNTL_H
  37 #include <fcntl.h>
  38 #endif
  39 #include <pcap.h>
  40 #include <stdio.h>
  41 #include <stdarg.h>
  42 #include <stdlib.h>
  43 #include <string.h>
  44 #ifdef TIME_WITH_SYS_TIME
  45 #include <time.h>
  46 #endif
  47
  48 #include "interface.h"
  49
  50 /*
  51  * Print out a filename (or other ascii string).
  52  * If ep is NULL, assume no truncation check is needed.
  53  * Return true if truncated.
  54  */
  55 int
  56 fn_print(register const u_char *s, register const u_char *ep)
  57 {
  58         register int ret;
  59         register u_char c;
  60
  61         ret = 1;                        /* assume truncated */
  62         while (ep == NULL || s < ep) {
  63                 c = *s++;
  64                 if (c == '\0') {
  65                         ret = 0;
  66                         break;
  67                 }
  68                 if (!isascii(c)) {
  69                         c = toascii(c);
  70                         putchar('M');
  71                         putchar('-');
  72                 }
  73                 if (!isprint(c)) {
  74                         c ^= 0x40;      /* DEL to ?, others to alpha */
  75                         putchar('^');
  76                 }
  77                 putchar(c);
  78         }
  79         return(ret);
  80 }
  81
  82 /*
  83  * Print out a counted filename (or other ascii string).
  84  * If ep is NULL, assume no truncation check is needed.
  85  * Return true if truncated.
  86  */
  87 int
  88 fn_printn(register const u_char *s, register u_int n,
  89           register const u_char *ep)
  90 {
  91         register int ret;
  92         register u_char c;
  93
  94         ret = 1;                        /* assume truncated */
  95         while (ep == NULL || s < ep) {
  96                 if (n-- <= 0) {
  97                         ret = 0;
  98                         break;
  99                 }
 100                 c = *s++;
 101                 if (!isascii(c)) {
 102                         c = toascii(c);
 103                         putchar('M');
 104                         putchar('-');
 105                 }
 106                 if (!isprint(c)) {
 107                         c ^= 0x40;      /* DEL to ?, others to alpha */
 108                         putchar('^');
 109                 }
 110                 putchar(c);
 111         }
 112         return(ret);
 113 }
 114
 115 /*
 116  * Print the timestamp
 117  */
 118 void
 119 ts_print(register const struct timeval *tvp)
 120 {
 121         register int s;
 122         struct tm *tm;
 123         time_t Time;
 124         static unsigned b_sec;
 125         static unsigned b_usec;
 126
 127         switch(tflag) {
 128         case 1: /* Default */
 129                 s = (tvp->tv_sec + thiszone) % 86400;
 130                 (void)printf("%02d:%02d:%02d.%06u ",
 131                              s / 3600, (s % 3600) / 60, s % 60,
 132                              (unsigned)tvp->tv_usec);
 133                 break;
 134         case -1: /* Unix timeval style */
 135                 (void)printf("%u.%06u ",
 136                              (unsigned)tvp->tv_sec,
 137                              (unsigned)tvp->tv_usec);
 138                 break;
 139         case -2:
 140                 if (b_sec == 0) {
 141                         printf("000000 ");
 142                 } else {
 143                         int d_usec = tvp->tv_usec - b_usec;
 144                         int d_sec = tvp->tv_sec - b_sec;
 145
 146                         while (d_usec < 0) {
 147                                 d_usec += 1000000;
 148                                 d_sec--;
 149                         }
 150                         if (d_sec)
 151                                 printf("%d. ", d_sec);
 152                         printf("%06d ", d_usec);
 153                 }
 154                 b_sec = tvp->tv_sec;
 155                 b_usec = tvp->tv_usec;
 156                 break;
 157         case -3: /* Default + Date*/
 158                 s = (tvp->tv_sec + thiszone) % 86400;
 159                 Time = (tvp->tv_sec + thiszone) - s;
 160                 tm  = gmtime (&Time);
 161                 (void)printf("%02d/%02d/%04d %02d:%02d:%02d.%06u ",
 162                              tm->tm_mon+1, tm->tm_mday,
 163                              tm->tm_year+1900,
 164                              s / 3600, (s % 3600) / 60,
 165                              s % 60, (unsigned)tvp->tv_usec);
 166                 break;
 167         }
 168 }
 169
 170 /*
 171  * Print a relative number of seconds (e.g. hold time, prune timer)
 172  * in the form 5m1s.  This does no truncation, so 32230861 seconds
 173  * is represented as 1y1w1d1h1m1s.
 174  */
 175 void
 176 relts_print(int secs)
 177 {
 178         static const char *lengths[] = {"y", "w", "d", "h", "m", "s"};
 179         static const int seconds[] = {31536000, 604800, 86400, 3600, 60, 1};
 180         const char **l = lengths;
 181         const int *s = seconds;
 182
 183         if (secs == 0) {
 184                 (void)printf("0s");
 185                 return;
 186         }
 187         if (secs < 0) {
 188                 (void)printf("-");
 189                 secs = -secs;
 190         }
 191         while (secs > 0) {
 192                 if (secs >= *s) {
 193                         (void)printf("%d%s", secs / *s, *l);
 194                         secs -= (secs / *s) * *s;
 195                 }
 196                 s++;
 197                 l++;
 198         }
 199 }
 200
 201 /*
 202  *  this is a generic routine for printing unknown data;
 203  *  we pass on the linefeed plus indentation string to
 204  *  get a proper output - returns 0 on error
 205  */
 206
 207 int
 208 print_unknown_data(const u_char *cp,const char *lf,int len)
 209 {
 210         int i;
 211
 212         printf("%s0x0000: ",lf);
 213         for(i=0;i<len;i++) {
 214             if (!TTEST2(*(cp+i), 1)) {
 215               printf("%spacket exceeded snapshot",lf);
 216               return(0);
 217             }
 218             printf("%02x",*(cp+i));
 219             if (i%2)
 220                 printf(" ");
 221             if (i/16!=(i+1)/16) {
 222                 if (i<(len-1))
 223                     printf("%s0x%04x: ",lf,i);
 224             }
 225         }
 226         return(1); /* everything is ok */
 227 }
 228
 229 /*
 230  * Convert a token value to a string; use "fmt" if not found.
 231  */
 232 const char *
 233 tok2str(register const struct tok *lp, register const char *fmt,
 234         register int v)
 235 {
 236         static char buf[128];
 237
 238         while (lp->s != NULL) {
 239                 if (lp->v == v)
 240                         return (lp->s);
 241                 ++lp;
 242         }
 243         if (fmt == NULL)
 244                 fmt = "#%d";
 245         (void)snprintf(buf, sizeof(buf), fmt, v);
 246         return (buf);
 247 }
 248
 249 /*
 250  * Convert a value to a string using an array; the macro
 251  * tok2strary() in <interface.h> is the public interface to
 252  * this function and ensures that the second argument is
 253  * correct for bounds-checking.
 254  */
 255 const char *
 256 tok2strary_internal(register const char **lp, int n, register const char *fmt,
 257         register int v)
 258 {
 259         static char buf[128];
 260
 261         if (v >= 0 && v < n && lp[v] != NULL)
 262                 return lp[v];
 263         if (fmt == NULL)
 264                 fmt = "#%d";
 265         (void)snprintf(buf, sizeof(buf), fmt, v);
 266         return (buf);
 267 }
 268
 269 /* VARARGS */
 270 void
 271 error(const char *fmt, ...)
 272 {
 273         va_list ap;
 274
 275         (void)fprintf(stderr, "%s: ", program_name);
 276         va_start(ap, fmt);
 277         (void)vfprintf(stderr, fmt, ap);
 278         va_end(ap);
 279         if (*fmt) {
 280                 fmt += strlen(fmt);
 281                 if (fmt[-1] != '\n')
 282                         (void)fputc('\n', stderr);
 283         }
 284         exit(1);
 285         /* NOTREACHED */
 286 }
 287
 288 /* VARARGS */
 289 void
 290 warning(const char *fmt, ...)
 291 {
 292         va_list ap;
 293
 294         (void)fprintf(stderr, "%s: WARNING: ", program_name);
 295         va_start(ap, fmt);
 296         (void)vfprintf(stderr, fmt, ap);
 297         va_end(ap);
 298         if (*fmt) {
 299                 fmt += strlen(fmt);
 300                 if (fmt[-1] != '\n')
 301                         (void)fputc('\n', stderr);
 302         }
 303 }
 304
 305 /*
 306  * Copy arg vector into a new buffer, concatenating arguments with spaces.
 307  */
 308 char *
 309 copy_argv(register char **argv)
 310 {
 311         register char **p;
 312         register u_int len = 0;
 313         char *buf;
 314         char *src, *dst;
 315
 316         p = argv;
 317         if (*p == 0)
 318                 return 0;
 319
 320         while (*p)
 321                 len += strlen(*p++) + 1;
 322
 323         buf = (char *)malloc(len);
 324         if (buf == NULL)
 325                 error("copy_argv: malloc");
 326
 327         p = argv;
 328         dst = buf;
 329         while ((src = *p++) != NULL) {
 330                 while ((*dst++ = *src++) != '\0')
 331                         ;
 332                 dst[-1] = ' ';
 333         }
 334         dst[-1] = '\0';
 335
 336         return buf;
 337 }
 338
 339 char *
 340 read_infile(char *fname)
 341 {
 342         register int fd, cc;
 343         register char *cp;
 344         struct stat buf;
 345
 346         fd = open(fname, O_RDONLY);
 347         if (fd < 0)
 348                 error("can't open %s: %s", fname, pcap_strerror(errno));
 349
 350         if (fstat(fd, &buf) < 0)
 351                 error("can't stat %s: %s", fname, pcap_strerror(errno));
 352
 353         cp = malloc((u_int)buf.st_size + 1);
 354         if (cp == NULL)
 355                 error("malloc(%d) for %s: %s", (u_int)buf.st_size + 1,
 356                         fname, pcap_strerror(errno));
 357         cc = read(fd, cp, (u_int)buf.st_size);
 358         if (cc < 0)
 359                 error("read %s: %s", fname, pcap_strerror(errno));
 360         if (cc != buf.st_size)
 361 #ifndef WIN32
 362                 error("short read %s (%d != %d)", fname, cc, (int)buf.st_size);
 363 #else
 364 /* Windows seems not to like the final \xa character */
 365         {
 366                 char *pdest;
 367                 pdest=strchr( cp, '\xa');
 368                 *pdest=0;
 369         }
 370 #endif /* WIN32 */
 371         cp[(int)buf.st_size] = '\0';
 372
 373         return (cp);
 374 }
 375
 376 void
 377 safeputs(const char *s)
 378 {
 379         while (*s) {
 380                 safeputchar(*s);
 381                 s++;
 382         }
 383 }
 384
 385 void
 386 safeputchar(int c)
 387 {
 388         unsigned char ch;
 389
 390         ch = (unsigned char)(c & 0xff);
 391         if (ch < 0x80 && isprint(ch))
 392                 printf("%c", ch);
 393         else
 394                 printf("\\%03o", ch);
 395 }