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 1.74 2002-07-16 03:58:16 guy 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  * Convert a token value to a string; use "fmt" if not found.
 206  */
 207 const char *
 208 tok2str(register const struct tok *lp, register const char *fmt,
 209         register int v)
 210 {
 211         static char buf[128];
 212
 213         while (lp->s != NULL) {
 214                 if (lp->v == v)
 215                         return (lp->s);
 216                 ++lp;
 217         }
 218         if (fmt == NULL)
 219                 fmt = "#%d";
 220         (void)snprintf(buf, sizeof(buf), fmt, v);
 221         return (buf);
 222 }
 223
 224 /*
 225  * Convert a value to a string using an array; the macro
 226  * tok2strary() in <interface.h> is the public interface to
 227  * this function and ensures that the second argument is
 228  * correct for bounds-checking.
 229  */
 230 const char *
 231 tok2strary_internal(register const char **lp, int n, register const char *fmt,
 232         register int v)
 233 {
 234         static char buf[128];
 235
 236         if (v >= 0 && v < n && lp[v] != NULL)
 237                 return lp[v];
 238         if (fmt == NULL)
 239                 fmt = "#%d";
 240         (void)snprintf(buf, sizeof(buf), fmt, v);
 241         return (buf);
 242 }
 243
 244 /* VARARGS */
 245 void
 246 error(const char *fmt, ...)
 247 {
 248         va_list ap;
 249
 250         (void)fprintf(stderr, "%s: ", program_name);
 251         va_start(ap, fmt);
 252         (void)vfprintf(stderr, fmt, ap);
 253         va_end(ap);
 254         if (*fmt) {
 255                 fmt += strlen(fmt);
 256                 if (fmt[-1] != '\n')
 257                         (void)fputc('\n', stderr);
 258         }
 259         exit(1);
 260         /* NOTREACHED */
 261 }
 262
 263 /* VARARGS */
 264 void
 265 warning(const char *fmt, ...)
 266 {
 267         va_list ap;
 268
 269         (void)fprintf(stderr, "%s: WARNING: ", program_name);
 270         va_start(ap, fmt);
 271         (void)vfprintf(stderr, fmt, ap);
 272         va_end(ap);
 273         if (*fmt) {
 274                 fmt += strlen(fmt);
 275                 if (fmt[-1] != '\n')
 276                         (void)fputc('\n', stderr);
 277         }
 278 }
 279
 280 /*
 281  * Copy arg vector into a new buffer, concatenating arguments with spaces.
 282  */
 283 char *
 284 copy_argv(register char **argv)
 285 {
 286         register char **p;
 287         register u_int len = 0;
 288         char *buf;
 289         char *src, *dst;
 290
 291         p = argv;
 292         if (*p == 0)
 293                 return 0;
 294
 295         while (*p)
 296                 len += strlen(*p++) + 1;
 297
 298         buf = (char *)malloc(len);
 299         if (buf == NULL)
 300                 error("copy_argv: malloc");
 301
 302         p = argv;
 303         dst = buf;
 304         while ((src = *p++) != NULL) {
 305                 while ((*dst++ = *src++) != '\0')
 306                         ;
 307                 dst[-1] = ' ';
 308         }
 309         dst[-1] = '\0';
 310
 311         return buf;
 312 }
 313
 314 char *
 315 read_infile(char *fname)
 316 {
 317         register int fd, cc;
 318         register char *cp;
 319         struct stat buf;
 320
 321         fd = open(fname, O_RDONLY);
 322         if (fd < 0)
 323                 error("can't open %s: %s", fname, pcap_strerror(errno));
 324
 325         if (fstat(fd, &buf) < 0)
 326                 error("can't stat %s: %s", fname, pcap_strerror(errno));
 327
 328         cp = malloc((u_int)buf.st_size + 1);
 329         if (cp == NULL)
 330                 error("malloc(%d) for %s: %s", (u_int)buf.st_size + 1,
 331                         fname, pcap_strerror(errno));
 332         cc = read(fd, cp, (u_int)buf.st_size);
 333         if (cc < 0)
 334                 error("read %s: %s", fname, pcap_strerror(errno));
 335         if (cc != buf.st_size)
 336                 error("short read %s (%d != %d)", fname, cc, (int)buf.st_size);
 337         cp[(int)buf.st_size] = '\0';
 338
 339         return (cp);
 340 }
 341
 342 void
 343 safeputs(const char *s)
 344 {
 345         while (*s) {
 346                 safeputchar(*s);
 347                 s++;
 348         }
 349 }
 350
 351 void
 352 safeputchar(int c)
 353 {
 354         unsigned char ch;
 355
 356         ch = (unsigned char)(c & 0xff);
 357         if (ch < 0x80 && isprint(ch))
 358                 printf("%c", ch & 0xff);
 359         else
 360                 printf("\\%03o", ch & 0xff);
 361 }