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 1.60 1999-11-21 09:37:05 fenner 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
 133         if (tflag > 0) {
 134                 /* Default */
 135                 s = (tvp->tv_sec + thiszone) % 86400;
 136                 (void)printf("%02d:%02d:%02d.%06u ",
 137                     s / 3600, (s % 3600) / 60, s % 60, (u_int32_t)tvp->tv_usec);
 138         } else if (tflag < 0) {
 139                 if (tflag < -1) {
 140                         static unsigned b_sec;
 141                         static unsigned b_usec;
 142                         if (b_sec == 0) {
 143                                 printf("000000 ");
 144                         } else {
 145                                 int d_usec = tvp->tv_usec - b_usec;
 146                                 int d_sec = tvp->tv_sec - b_sec;
 147
 148                                 while (d_usec < 0) {
 149                                         d_usec += 1000000;
 150                                         d_sec--;
 151                                 }
 152                                 if (d_sec)
 153                                         printf("%d. ", d_sec);
 154                                 printf("%06d ", d_usec);
 155                         }
 156                         b_sec = tvp->tv_sec;
 157                         b_usec = tvp->tv_usec;
 158                 } else {
 159                         /* Unix timeval style */
 160                         (void)printf("%u.%06u ",
 161                                      (u_int32_t)tvp->tv_sec, (u_int32_t)tvp->tv_usec);
 162                 }
 163         }
 164 }
 165
 166 /*
 167  * Convert a token value to a string; use "fmt" if not found.
 168  */
 169 const char *
 170 tok2str(register const struct tok *lp, register const char *fmt,
 171         register int v)
 172 {
 173         static char buf[128];
 174
 175         while (lp->s != NULL) {
 176                 if (lp->v == v)
 177                         return (lp->s);
 178                 ++lp;
 179         }
 180         if (fmt == NULL)
 181                 fmt = "#%d";
 182         (void)sprintf(buf, fmt, v);
 183         return (buf);
 184 }
 185
 186
 187 /* VARARGS */
 188 __dead void
 189 #if __STDC__
 190 error(const char *fmt, ...)
 191 #else
 192 error(fmt, va_alist)
 193         const char *fmt;
 194         va_dcl
 195 #endif
 196 {
 197         va_list ap;
 198
 199         (void)fprintf(stderr, "%s: ", program_name);
 200 #if __STDC__
 201         va_start(ap, fmt);
 202 #else
 203         va_start(ap);
 204 #endif
 205         (void)vfprintf(stderr, fmt, ap);
 206         va_end(ap);
 207         if (*fmt) {
 208                 fmt += strlen(fmt);
 209                 if (fmt[-1] != '\n')
 210                         (void)fputc('\n', stderr);
 211         }
 212         exit(1);
 213         /* NOTREACHED */
 214 }
 215
 216 /* VARARGS */
 217 void
 218 #if __STDC__
 219 warning(const char *fmt, ...)
 220 #else
 221 warning(fmt, va_alist)
 222         const char *fmt;
 223         va_dcl
 224 #endif
 225 {
 226         va_list ap;
 227
 228         (void)fprintf(stderr, "%s: WARNING: ", program_name);
 229 #if __STDC__
 230         va_start(ap, fmt);
 231 #else
 232         va_start(ap);
 233 #endif
 234         (void)vfprintf(stderr, fmt, ap);
 235         va_end(ap);
 236         if (*fmt) {
 237                 fmt += strlen(fmt);
 238                 if (fmt[-1] != '\n')
 239                         (void)fputc('\n', stderr);
 240         }
 241 }
 242
 243 /*
 244  * Copy arg vector into a new buffer, concatenating arguments with spaces.
 245  */
 246 char *
 247 copy_argv(register char **argv)
 248 {
 249         register char **p;
 250         register u_int len = 0;
 251         char *buf;
 252         char *src, *dst;
 253
 254         p = argv;
 255         if (*p == 0)
 256                 return 0;
 257
 258         while (*p)
 259                 len += strlen(*p++) + 1;
 260
 261         buf = (char *)malloc(len);
 262         if (buf == NULL)
 263                 error("copy_argv: malloc");
 264
 265         p = argv;
 266         dst = buf;
 267         while ((src = *p++) != NULL) {
 268                 while ((*dst++ = *src++) != '\0')
 269                         ;
 270                 dst[-1] = ' ';
 271         }
 272         dst[-1] = '\0';
 273
 274         return buf;
 275 }
 276
 277 char *
 278 read_infile(char *fname)
 279 {
 280         register int fd, cc;
 281         register char *cp;
 282         struct stat buf;
 283
 284         fd = open(fname, O_RDONLY);
 285         if (fd < 0)
 286                 error("can't open %s: %s", fname, pcap_strerror(errno));
 287
 288         if (fstat(fd, &buf) < 0)
 289                 error("can't stat %s: %s", fname, pcap_strerror(errno));
 290
 291         cp = malloc((u_int)buf.st_size + 1);
 292         cc = read(fd, cp, (int)buf.st_size);
 293         if (cc < 0)
 294                 error("read %s: %s", fname, pcap_strerror(errno));
 295         if (cc != buf.st_size)
 296                 error("short read %s (%d != %d)", fname, cc, (int)buf.st_size);
 297         cp[(int)buf.st_size] = '\0';
 298
 299         return (cp);
 300 }