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 1.76 2002-07-18 00:04:12 hannes 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 #include <pcap.h>
  42 #include <stdio.h>
  43 #include <stdarg.h>
  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  */
  58 int
  59 fn_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  */
  90 int
  91 fn_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  */
 121 void
 122 ts_print(register const struct timeval *tvp)
 123 {
 124         register int s;
 125         struct tm *tm;
 126         time_t Time;
 127         static unsigned b_sec;
 128         static unsigned b_usec;
 129
 130         switch(tflag) {
 131         case 1: /* Default */
 132                 s = (tvp->tv_sec + thiszone) % 86400;
 133                 (void)printf("%02d:%02d:%02d.%06u ",
 134                              s / 3600, (s % 3600) / 60, s % 60,
 135                              (unsigned)tvp->tv_usec);
 136                 break;
 137         case -1: /* Unix timeval style */
 138                 (void)printf("%u.%06u ",
 139                              (unsigned)tvp->tv_sec,
 140                              (unsigned)tvp->tv_usec);
 141                 break;
 142         case -2:
 143                 if (b_sec == 0) {
 144                         printf("000000 ");
 145                 } else {
 146                         int d_usec = tvp->tv_usec - b_usec;
 147                         int d_sec = tvp->tv_sec - b_sec;
 148
 149                         while (d_usec < 0) {
 150                                 d_usec += 1000000;
 151                                 d_sec--;
 152                         }
 153                         if (d_sec)
 154                                 printf("%d. ", d_sec);
 155                         printf("%06d ", d_usec);
 156                 }
 157                 b_sec = tvp->tv_sec;
 158                 b_usec = tvp->tv_usec;
 159                 break;
 160         case -3: /* Default + Date*/
 161                 s = (tvp->tv_sec + thiszone) % 86400;
 162                 Time = (tvp->tv_sec + thiszone) - s;
 163                 tm  = gmtime (&Time);
 164                 (void)printf("%02d/%02d/%04d %02d:%02d:%02d.%06u ",
 165                              tm->tm_mon+1, tm->tm_mday,
 166                              tm->tm_year+1900,
 167                              s / 3600, (s % 3600) / 60,
 168                              s % 60, (unsigned)tvp->tv_usec);
 169                 break;
 170         }
 171 }
 172
 173 /*
 174  * Print a relative number of seconds (e.g. hold time, prune timer)
 175  * in the form 5m1s.  This does no truncation, so 32230861 seconds
 176  * is represented as 1y1w1d1h1m1s.
 177  */
 178 void
 179 relts_print(int secs)
 180 {
 181         static const char *lengths[] = {"y", "w", "d", "h", "m", "s"};
 182         static const int seconds[] = {31536000, 604800, 86400, 3600, 60, 1};
 183         const char **l = lengths;
 184         const int *s = seconds;
 185
 186         if (secs == 0) {
 187                 (void)printf("0s");
 188                 return;
 189         }
 190         if (secs < 0) {
 191                 (void)printf("-");
 192                 secs = -secs;
 193         }
 194         while (secs > 0) {
 195                 if (secs >= *s) {
 196                         (void)printf("%d%s", secs / *s, *l);
 197                         secs -= (secs / *s) * *s;
 198                 }
 199                 s++;
 200                 l++;
 201         }
 202 }
 203
 204 /*
 205  *  this is a generic routine for printing unknown data;
 206  *  we pass on the linefeed plus indentation string to
 207  *  get a proper output - returns 0 on error
 208  */
 209
 210 int
 211 print_unknown_data(const u_char *cp,const char *lf,int len)
 212 {
 213         int i;
 214
 215         printf("%s0x0000: ",lf);
 216         for(i=0;i<len;i++) {
 217             if (!TTEST2(*(cp+i), 1)) {
 218               printf("%spacket exceeded snapshot",lf);
 219               return(0);
 220             }
 221             printf("%02x",*(cp+i));
 222             if (i%2)
 223                 printf(" ");
 224             if (i/16!=(i+1)/16) {
 225                 if (i<(len-1))
 226                     printf("%s0x%04x: ",lf,i);
 227             }
 228         }
 229         return(1); /* everything is ok */
 230 }
 231
 232 /*
 233  * Convert a token value to a string; use "fmt" if not found.
 234  */
 235 const char *
 236 tok2str(register const struct tok *lp, register const char *fmt,
 237         register int v)
 238 {
 239         static char buf[128];
 240
 241         while (lp->s != NULL) {
 242                 if (lp->v == v)
 243                         return (lp->s);
 244                 ++lp;
 245         }
 246         if (fmt == NULL)
 247                 fmt = "#%d";
 248         (void)snprintf(buf, sizeof(buf), fmt, v);
 249         return (buf);
 250 }
 251
 252 /*
 253  * Convert a value to a string using an array; the macro
 254  * tok2strary() in <interface.h> is the public interface to
 255  * this function and ensures that the second argument is
 256  * correct for bounds-checking.
 257  */
 258 const char *
 259 tok2strary_internal(register const char **lp, int n, register const char *fmt,
 260         register int v)
 261 {
 262         static char buf[128];
 263
 264         if (v >= 0 && v < n && lp[v] != NULL)
 265                 return lp[v];
 266         if (fmt == NULL)
 267                 fmt = "#%d";
 268         (void)snprintf(buf, sizeof(buf), fmt, v);
 269         return (buf);
 270 }
 271
 272 /* VARARGS */
 273 void
 274 error(const char *fmt, ...)
 275 {
 276         va_list ap;
 277
 278         (void)fprintf(stderr, "%s: ", program_name);
 279         va_start(ap, fmt);
 280         (void)vfprintf(stderr, fmt, ap);
 281         va_end(ap);
 282         if (*fmt) {
 283                 fmt += strlen(fmt);
 284                 if (fmt[-1] != '\n')
 285                         (void)fputc('\n', stderr);
 286         }
 287         exit(1);
 288         /* NOTREACHED */
 289 }
 290
 291 /* VARARGS */
 292 void
 293 warning(const char *fmt, ...)
 294 {
 295         va_list ap;
 296
 297         (void)fprintf(stderr, "%s: WARNING: ", program_name);
 298         va_start(ap, fmt);
 299         (void)vfprintf(stderr, fmt, ap);
 300         va_end(ap);
 301         if (*fmt) {
 302                 fmt += strlen(fmt);
 303                 if (fmt[-1] != '\n')
 304                         (void)fputc('\n', stderr);
 305         }
 306 }
 307
 308 /*
 309  * Copy arg vector into a new buffer, concatenating arguments with spaces.
 310  */
 311 char *
 312 copy_argv(register char **argv)
 313 {
 314         register char **p;
 315         register u_int len = 0;
 316         char *buf;
 317         char *src, *dst;
 318
 319         p = argv;
 320         if (*p == 0)
 321                 return 0;
 322
 323         while (*p)
 324                 len += strlen(*p++) + 1;
 325
 326         buf = (char *)malloc(len);
 327         if (buf == NULL)
 328                 error("copy_argv: malloc");
 329
 330         p = argv;
 331         dst = buf;
 332         while ((src = *p++) != NULL) {
 333                 while ((*dst++ = *src++) != '\0')
 334                         ;
 335                 dst[-1] = ' ';
 336         }
 337         dst[-1] = '\0';
 338
 339         return buf;
 340 }
 341
 342 char *
 343 read_infile(char *fname)
 344 {
 345         register int fd, cc;
 346         register char *cp;
 347         struct stat buf;
 348
 349         fd = open(fname, O_RDONLY);
 350         if (fd < 0)
 351                 error("can't open %s: %s", fname, pcap_strerror(errno));
 352
 353         if (fstat(fd, &buf) < 0)
 354                 error("can't stat %s: %s", fname, pcap_strerror(errno));
 355
 356         cp = malloc((u_int)buf.st_size + 1);
 357         if (cp == NULL)
 358                 error("malloc(%d) for %s: %s", (u_int)buf.st_size + 1,
 359                         fname, pcap_strerror(errno));
 360         cc = read(fd, cp, (u_int)buf.st_size);
 361         if (cc < 0)
 362                 error("read %s: %s", fname, pcap_strerror(errno));
 363         if (cc != buf.st_size)
 364                 error("short read %s (%d != %d)", fname, cc, (int)buf.st_size);
 365         cp[(int)buf.st_size] = '\0';
 366
 367         return (cp);
 368 }
 369
 370 void
 371 safeputs(const char *s)
 372 {
 373         while (*s) {
 374                 safeputchar(*s);
 375                 s++;
 376         }
 377 }
 378
 379 void
 380 safeputchar(int c)
 381 {
 382         unsigned char ch;
 383
 384         ch = (unsigned char)(c & 0xff);
 385         if (ch < 0x80 && isprint(ch))
 386                 printf("%c", ch);
 387         else
 388                 printf("\\%03o", ch);
 389 }