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 1.79 2002-08-06 04:42:07 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
  45 #include "interface.h"
  46
  47 /*
  48  * Print out a filename (or other ascii string).
  49  * If ep is NULL, assume no truncation check is needed.
  50  * Return true if truncated.
  51  */
  52 int
  53 fn_print(register const u_char *s, register const u_char *ep)
  54 {
  55         register int ret;
  56         register u_char c;
  57
  58         ret = 1;                        /* assume truncated */
  59         while (ep == NULL || s < ep) {
  60                 c = *s++;
  61                 if (c == '\0') {
  62                         ret = 0;
  63                         break;
  64                 }
  65                 if (!isascii(c)) {
  66                         c = toascii(c);
  67                         putchar('M');
  68                         putchar('-');
  69                 }
  70                 if (!isprint(c)) {
  71                         c ^= 0x40;      /* DEL to ?, others to alpha */
  72                         putchar('^');
  73                 }
  74                 putchar(c);
  75         }
  76         return(ret);
  77 }
  78
  79 /*
  80  * Print out a counted filename (or other ascii string).
  81  * If ep is NULL, assume no truncation check is needed.
  82  * Return true if truncated.
  83  */
  84 int
  85 fn_printn(register const u_char *s, register u_int n,
  86           register const u_char *ep)
  87 {
  88         register int ret;
  89         register u_char c;
  90
  91         ret = 1;                        /* assume truncated */
  92         while (ep == NULL || s < ep) {
  93                 if (n-- <= 0) {
  94                         ret = 0;
  95                         break;
  96                 }
  97                 c = *s++;
  98                 if (!isascii(c)) {
  99                         c = toascii(c);
 100                         putchar('M');
 101                         putchar('-');
 102                 }
 103                 if (!isprint(c)) {
 104                         c ^= 0x40;      /* DEL to ?, others to alpha */
 105                         putchar('^');
 106                 }
 107                 putchar(c);
 108         }
 109         return(ret);
 110 }
 111
 112 /*
 113  * Print the timestamp
 114  */
 115 void
 116 ts_print(register const struct timeval *tvp)
 117 {
 118         register int s;
 119         struct tm *tm;
 120         time_t Time;
 121         static unsigned b_sec;
 122         static unsigned b_usec;
 123
 124         switch(tflag) {
 125         case 1: /* Default */
 126                 s = (tvp->tv_sec + thiszone) % 86400;
 127                 (void)printf("%02d:%02d:%02d.%06u ",
 128                              s / 3600, (s % 3600) / 60, s % 60,
 129                              (unsigned)tvp->tv_usec);
 130                 break;
 131         case -1: /* Unix timeval style */
 132                 (void)printf("%u.%06u ",
 133                              (unsigned)tvp->tv_sec,
 134                              (unsigned)tvp->tv_usec);
 135                 break;
 136         case -2:
 137                 if (b_sec == 0) {
 138                         printf("000000 ");
 139                 } else {
 140                         int d_usec = tvp->tv_usec - b_usec;
 141                         int d_sec = tvp->tv_sec - b_sec;
 142
 143                         while (d_usec < 0) {
 144                                 d_usec += 1000000;
 145                                 d_sec--;
 146                         }
 147                         if (d_sec)
 148                                 printf("%d. ", d_sec);
 149                         printf("%06d ", d_usec);
 150                 }
 151                 b_sec = tvp->tv_sec;
 152                 b_usec = tvp->tv_usec;
 153                 break;
 154         case -3: /* Default + Date*/
 155                 s = (tvp->tv_sec + thiszone) % 86400;
 156                 Time = (tvp->tv_sec + thiszone) - s;
 157                 tm  = gmtime (&Time);
 158                 (void)printf("%02d/%02d/%04d %02d:%02d:%02d.%06u ",
 159                              tm->tm_mon+1, tm->tm_mday,
 160                              tm->tm_year+1900,
 161                              s / 3600, (s % 3600) / 60,
 162                              s % 60, (unsigned)tvp->tv_usec);
 163                 break;
 164         }
 165 }
 166
 167 /*
 168  * Print a relative number of seconds (e.g. hold time, prune timer)
 169  * in the form 5m1s.  This does no truncation, so 32230861 seconds
 170  * is represented as 1y1w1d1h1m1s.
 171  */
 172 void
 173 relts_print(int secs)
 174 {
 175         static const char *lengths[] = {"y", "w", "d", "h", "m", "s"};
 176         static const int seconds[] = {31536000, 604800, 86400, 3600, 60, 1};
 177         const char **l = lengths;
 178         const int *s = seconds;
 179
 180         if (secs == 0) {
 181                 (void)printf("0s");
 182                 return;
 183         }
 184         if (secs < 0) {
 185                 (void)printf("-");
 186                 secs = -secs;
 187         }
 188         while (secs > 0) {
 189                 if (secs >= *s) {
 190                         (void)printf("%d%s", secs / *s, *l);
 191                         secs -= (secs / *s) * *s;
 192                 }
 193                 s++;
 194                 l++;
 195         }
 196 }
 197
 198 /*
 199  *  this is a generic routine for printing unknown data;
 200  *  we pass on the linefeed plus indentation string to
 201  *  get a proper output - returns 0 on error
 202  */
 203
 204 int
 205 print_unknown_data(const u_char *cp,const char *lf,int len)
 206 {
 207         int i;
 208
 209         printf("%s0x0000: ",lf);
 210         for(i=0;i<len;i++) {
 211             if (!TTEST2(*(cp+i), 1)) {
 212               printf("%spacket exceeded snapshot",lf);
 213               return(0);
 214             }
 215             printf("%02x",*(cp+i));
 216             if (i%2)
 217                 printf(" ");
 218             if (i/16!=(i+1)/16) {
 219                 if (i<(len-1))
 220                     printf("%s0x%04x: ",lf,i);
 221             }
 222         }
 223         return(1); /* everything is ok */
 224 }
 225
 226 /*
 227  * Convert a token value to a string; use "fmt" if not found.
 228  */
 229 const char *
 230 tok2str(register const struct tok *lp, register const char *fmt,
 231         register int v)
 232 {
 233         static char buf[128];
 234
 235         while (lp->s != NULL) {
 236                 if (lp->v == v)
 237                         return (lp->s);
 238                 ++lp;
 239         }
 240         if (fmt == NULL)
 241                 fmt = "#%d";
 242         (void)snprintf(buf, sizeof(buf), fmt, v);
 243         return (buf);
 244 }
 245
 246 /*
 247  * Convert a value to a string using an array; the macro
 248  * tok2strary() in <interface.h> is the public interface to
 249  * this function and ensures that the second argument is
 250  * correct for bounds-checking.
 251  */
 252 const char *
 253 tok2strary_internal(register const char **lp, int n, register const char *fmt,
 254         register int v)
 255 {
 256         static char buf[128];
 257
 258         if (v >= 0 && v < n && lp[v] != NULL)
 259                 return lp[v];
 260         if (fmt == NULL)
 261                 fmt = "#%d";
 262         (void)snprintf(buf, sizeof(buf), fmt, v);
 263         return (buf);
 264 }
 265
 266 /* VARARGS */
 267 void
 268 error(const char *fmt, ...)
 269 {
 270         va_list ap;
 271
 272         (void)fprintf(stderr, "%s: ", program_name);
 273         va_start(ap, fmt);
 274         (void)vfprintf(stderr, fmt, ap);
 275         va_end(ap);
 276         if (*fmt) {
 277                 fmt += strlen(fmt);
 278                 if (fmt[-1] != '\n')
 279                         (void)fputc('\n', stderr);
 280         }
 281         exit(1);
 282         /* NOTREACHED */
 283 }
 284
 285 /* VARARGS */
 286 void
 287 warning(const char *fmt, ...)
 288 {
 289         va_list ap;
 290
 291         (void)fprintf(stderr, "%s: WARNING: ", program_name);
 292         va_start(ap, fmt);
 293         (void)vfprintf(stderr, fmt, ap);
 294         va_end(ap);
 295         if (*fmt) {
 296                 fmt += strlen(fmt);
 297                 if (fmt[-1] != '\n')
 298                         (void)fputc('\n', stderr);
 299         }
 300 }
 301
 302 /*
 303  * Copy arg vector into a new buffer, concatenating arguments with spaces.
 304  */
 305 char *
 306 copy_argv(register char **argv)
 307 {
 308         register char **p;
 309         register u_int len = 0;
 310         char *buf;
 311         char *src, *dst;
 312
 313         p = argv;
 314         if (*p == 0)
 315                 return 0;
 316
 317         while (*p)
 318                 len += strlen(*p++) + 1;
 319
 320         buf = (char *)malloc(len);
 321         if (buf == NULL)
 322                 error("copy_argv: malloc");
 323
 324         p = argv;
 325         dst = buf;
 326         while ((src = *p++) != NULL) {
 327                 while ((*dst++ = *src++) != '\0')
 328                         ;
 329                 dst[-1] = ' ';
 330         }
 331         dst[-1] = '\0';
 332
 333         return buf;
 334 }
 335
 336 char *
 337 read_infile(char *fname)
 338 {
 339         register int fd, cc;
 340         register char *cp;
 341         struct stat buf;
 342
 343         fd = open(fname, O_RDONLY);
 344         if (fd < 0)
 345                 error("can't open %s: %s", fname, pcap_strerror(errno));
 346
 347         if (fstat(fd, &buf) < 0)
 348                 error("can't stat %s: %s", fname, pcap_strerror(errno));
 349
 350         cp = malloc((u_int)buf.st_size + 1);
 351         if (cp == NULL)
 352                 error("malloc(%d) for %s: %s", (u_int)buf.st_size + 1,
 353                         fname, pcap_strerror(errno));
 354         cc = read(fd, cp, (u_int)buf.st_size);
 355         if (cc < 0)
 356                 error("read %s: %s", fname, pcap_strerror(errno));
 357         if (cc != buf.st_size)
 358 #ifndef WIN32
 359                 error("short read %s (%d != %d)", fname, cc, (int)buf.st_size);
 360 #else
 361 /* Windows seems not to like the final \xa character */
 362         {
 363                 char *pdest;
 364                 pdest=strchr( cp, '\xa');
 365                 *pdest=0;
 366         }
 367 #endif /* WIN32 */
 368         cp[(int)buf.st_size] = '\0';
 369
 370         return (cp);
 371 }
 372
 373 void
 374 safeputs(const char *s)
 375 {
 376         while (*s) {
 377                 safeputchar(*s);
 378                 s++;
 379         }
 380 }
 381
 382 void
 383 safeputchar(int c)
 384 {
 385         unsigned char ch;
 386
 387         ch = (unsigned char)(c & 0xff);
 388         if (ch < 0x80 && isprint(ch))
 389                 printf("%c", ch);
 390         else
 391                 printf("\\%03o", ch);
 392 }