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 1.59 1999-11-21 03:51:05 assar Exp $ (LBL)";
  25 #endif
  26
  27 #include <sys/types.h>
  28 #include <sys/time.h>
  29 #include <sys/file.h>
  30 #include <sys/stat.h>
  31
  32 #include <ctype.h>
  33 #include <errno.h>
  34 #ifdef HAVE_FCNTL_H
  35 #include <fcntl.h>
  36 #endif
  37 #ifdef HAVE_MALLOC_H
  38 #include <malloc.h>
  39 #endif
  40 #include <pcap.h>
  41 #include <stdio.h>
  42 #if __STDC__
  43 #include <stdarg.h>
  44 #else
  45 #include <varargs.h>
  46 #endif
  47 #include <stdlib.h>
  48 #include <string.h>
  49 #ifdef TIME_WITH_SYS_TIME
  50 #include <time.h>
  51 #endif
  52 #include <unistd.h>
  53
  54 #include "interface.h"
  55
  56 /*
  57  * Print out a filename (or other ascii string).
  58  * If ep is NULL, assume no truncation check is needed.
  59  * Return true if truncated.
  60  */
  61 int
  62 fn_print(register const u_char *s, register const u_char *ep)
  63 {
  64         register int ret;
  65         register u_char c;
  66
  67         ret = 1;                        /* assume truncated */
  68         while (ep == NULL || s < ep) {
  69                 c = *s++;
  70                 if (c == '\0') {
  71                         ret = 0;
  72                         break;
  73                 }
  74                 if (!isascii(c)) {
  75                         c = toascii(c);
  76                         putchar('M');
  77                         putchar('-');
  78                 }
  79                 if (!isprint(c)) {
  80                         c ^= 0x40;      /* DEL to ?, others to alpha */
  81                         putchar('^');
  82                 }
  83                 putchar(c);
  84         }
  85         return(ret);
  86 }
  87
  88 /*
  89  * Print out a counted filename (or other ascii string).
  90  * If ep is NULL, assume no truncation check is needed.
  91  * Return true if truncated.
  92  */
  93 int
  94 fn_printn(register const u_char *s, register u_int n,
  95           register const u_char *ep)
  96 {
  97         register int ret;
  98         register u_char c;
  99
 100         ret = 1;                        /* assume truncated */
 101         while (ep == NULL || s < ep) {
 102                 if (n-- <= 0) {
 103                         ret = 0;
 104                         break;
 105                 }
 106                 c = *s++;
 107                 if (!isascii(c)) {
 108                         c = toascii(c);
 109                         putchar('M');
 110                         putchar('-');
 111                 }
 112                 if (!isprint(c)) {
 113                         c ^= 0x40;      /* DEL to ?, others to alpha */
 114                         putchar('^');
 115                 }
 116                 putchar(c);
 117         }
 118         return(ret);
 119 }
 120
 121 /*
 122  * Print the timestamp
 123  */
 124 void
 125 ts_print(register const struct timeval *tvp)
 126 {
 127         register int s;
 128
 129         if (tflag > 0) {
 130                 /* Default */
 131                 s = (tvp->tv_sec + thiszone) % 86400;
 132                 (void)printf("%02d:%02d:%02d.%06u ",
 133                     s / 3600, (s % 3600) / 60, s % 60, (u_int32_t)tvp->tv_usec);
 134         } else if (tflag < 0) {
 135                 if (tflag < -1) {
 136                         static unsigned b_sec;
 137                         static unsigned b_usec;
 138                         if (b_sec == 0) {
 139                                 printf("000000 ");
 140                         } else {
 141                                 int d_usec = tvp->tv_usec - b_usec;
 142                                 int d_sec = tvp->tv_sec - b_sec;
 143
 144                                 while (d_usec < 0) {
 145                                         d_usec += 1000000;
 146                                         d_sec--;
 147                                 }
 148                                 if (d_sec)
 149                                         printf("%d. ", d_sec);
 150                                 printf("%06d ", d_usec);
 151                         }
 152                         b_sec = tvp->tv_sec;
 153                         b_usec = tvp->tv_usec;
 154                 } else {
 155                         /* Unix timeval style */
 156                         (void)printf("%u.%06u ",
 157                                      (u_int32_t)tvp->tv_sec, (u_int32_t)tvp->tv_usec);
 158                 }
 159         }
 160 }
 161
 162 /*
 163  * Convert a token value to a string; use "fmt" if not found.
 164  */
 165 const char *
 166 tok2str(register const struct tok *lp, register const char *fmt,
 167         register int v)
 168 {
 169         static char buf[128];
 170
 171         while (lp->s != NULL) {
 172                 if (lp->v == v)
 173                         return (lp->s);
 174                 ++lp;
 175         }
 176         if (fmt == NULL)
 177                 fmt = "#%d";
 178         (void)sprintf(buf, fmt, v);
 179         return (buf);
 180 }
 181
 182
 183 /* VARARGS */
 184 __dead void
 185 #if __STDC__
 186 error(const char *fmt, ...)
 187 #else
 188 error(fmt, va_alist)
 189         const char *fmt;
 190         va_dcl
 191 #endif
 192 {
 193         va_list ap;
 194
 195         (void)fprintf(stderr, "%s: ", program_name);
 196 #if __STDC__
 197         va_start(ap, fmt);
 198 #else
 199         va_start(ap);
 200 #endif
 201         (void)vfprintf(stderr, fmt, ap);
 202         va_end(ap);
 203         if (*fmt) {
 204                 fmt += strlen(fmt);
 205                 if (fmt[-1] != '\n')
 206                         (void)fputc('\n', stderr);
 207         }
 208         exit(1);
 209         /* NOTREACHED */
 210 }
 211
 212 /* VARARGS */
 213 void
 214 #if __STDC__
 215 warning(const char *fmt, ...)
 216 #else
 217 warning(fmt, va_alist)
 218         const char *fmt;
 219         va_dcl
 220 #endif
 221 {
 222         va_list ap;
 223
 224         (void)fprintf(stderr, "%s: WARNING: ", program_name);
 225 #if __STDC__
 226         va_start(ap, fmt);
 227 #else
 228         va_start(ap);
 229 #endif
 230         (void)vfprintf(stderr, fmt, ap);
 231         va_end(ap);
 232         if (*fmt) {
 233                 fmt += strlen(fmt);
 234                 if (fmt[-1] != '\n')
 235                         (void)fputc('\n', stderr);
 236         }
 237 }
 238
 239 /*
 240  * Copy arg vector into a new buffer, concatenating arguments with spaces.
 241  */
 242 char *
 243 copy_argv(register char **argv)
 244 {
 245         register char **p;
 246         register u_int len = 0;
 247         char *buf;
 248         char *src, *dst;
 249
 250         p = argv;
 251         if (*p == 0)
 252                 return 0;
 253
 254         while (*p)
 255                 len += strlen(*p++) + 1;
 256
 257         buf = (char *)malloc(len);
 258         if (buf == NULL)
 259                 error("copy_argv: malloc");
 260
 261         p = argv;
 262         dst = buf;
 263         while ((src = *p++) != NULL) {
 264                 while ((*dst++ = *src++) != '\0')
 265                         ;
 266                 dst[-1] = ' ';
 267         }
 268         dst[-1] = '\0';
 269
 270         return buf;
 271 }
 272
 273 char *
 274 read_infile(char *fname)
 275 {
 276         register int fd, cc;
 277         register char *cp;
 278         struct stat buf;
 279
 280         fd = open(fname, O_RDONLY);
 281         if (fd < 0)
 282                 error("can't open %s: %s", fname, pcap_strerror(errno));
 283
 284         if (fstat(fd, &buf) < 0)
 285                 error("can't stat %s: %s", fname, pcap_strerror(errno));
 286
 287         cp = malloc((u_int)buf.st_size + 1);
 288         cc = read(fd, cp, (int)buf.st_size);
 289         if (cc < 0)
 290                 error("read %s: %s", fname, pcap_strerror(errno));
 291         if (cc != buf.st_size)
 292                 error("short read %s (%d != %d)", fname, cc, (int)buf.st_size);
 293         cp[(int)buf.st_size] = '\0';
 294
 295         return (cp);
 296 }