The Tcpdump Group git mirrors - libpcap/blob - filtertest.c

   1 /*
   2  * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000
   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 copyright[] _U_ =
  24     "@(#) Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000\n\
  25 The Regents of the University of California.  All rights reserved.\n";
  26 static const char rcsid[] _U_ =
  27     "@(#) $Header: /tcpdump/master/libpcap/filtertest.c,v 1.2 2005-08-08 17:50:13 guy Exp $ (LBL)";
  28 #endif
  29
  30 #ifdef HAVE_CONFIG_H
  31 #include "config.h"
  32 #endif
  33
  34 #include <pcap.h>
  35 #include <stdio.h>
  36 #include <stdlib.h>
  37 #include <string.h>
  38 #include <stdarg.h>
  39 #include <unistd.h>
  40 #include <fcntl.h>
  41 #include <errno.h>
  42 #include <sys/types.h>
  43 #include <sys/stat.h>
  44
  45 #ifndef HAVE___ATTRIBUTE__
  46 #define __attribute__(x)
  47 #endif
  48
  49 static char *program_name;
  50
  51 /* Forwards */
  52 static void usage(void) __attribute__((noreturn));
  53 static void error(const char *, ...)
  54     __attribute__((noreturn, format (printf, 1, 2)));
  55
  56 extern int optind;
  57 extern int opterr;
  58 extern char *optarg;
  59
  60 /*
  61  * On Windows, we need to open the file in binary mode, so that
  62  * we get all the bytes specified by the size we get from "fstat()".
  63  * On UNIX, that's not necessary.  O_BINARY is defined on Windows;
  64  * we define it as 0 if it's not defined, so it does nothing.
  65  */
  66 #ifndef O_BINARY
  67 #define O_BINARY        0
  68 #endif
  69
  70 static char *
  71 read_infile(char *fname)
  72 {
  73         register int i, fd, cc;
  74         register char *cp;
  75         struct stat buf;
  76
  77         fd = open(fname, O_RDONLY|O_BINARY);
  78         if (fd < 0)
  79                 error("can't open %s: %s", fname, pcap_strerror(errno));
  80
  81         if (fstat(fd, &buf) < 0)
  82                 error("can't stat %s: %s", fname, pcap_strerror(errno));
  83
  84         cp = malloc((u_int)buf.st_size + 1);
  85         if (cp == NULL)
  86                 error("malloc(%d) for %s: %s", (u_int)buf.st_size + 1,
  87                         fname, pcap_strerror(errno));
  88         cc = read(fd, cp, (u_int)buf.st_size);
  89         if (cc < 0)
  90                 error("read %s: %s", fname, pcap_strerror(errno));
  91         if (cc != buf.st_size)
  92                 error("short read %s (%d != %d)", fname, cc, (int)buf.st_size);
  93
  94         close(fd);
  95         /* replace "# comment" with spaces */
  96         for (i = 0; i < cc; i++) {
  97                 if (cp[i] == '#')
  98                         while (i < cc && cp[i] != '\n')
  99                                 cp[i++] = ' ';
 100         }
 101         cp[cc] = '\0';
 102         return (cp);
 103 }
 104
 105 /* VARARGS */
 106 static void
 107 error(const char *fmt, ...)
 108 {
 109         va_list ap;
 110
 111         (void)fprintf(stderr, "%s: ", program_name);
 112         va_start(ap, fmt);
 113         (void)vfprintf(stderr, fmt, ap);
 114         va_end(ap);
 115         if (*fmt) {
 116                 fmt += strlen(fmt);
 117                 if (fmt[-1] != '\n')
 118                         (void)fputc('\n', stderr);
 119         }
 120         exit(1);
 121         /* NOTREACHED */
 122 }
 123
 124 /*
 125  * Copy arg vector into a new buffer, concatenating arguments with spaces.
 126  */
 127 static char *
 128 copy_argv(register char **argv)
 129 {
 130         register char **p;
 131         register u_int len = 0;
 132         char *buf;
 133         char *src, *dst;
 134
 135         p = argv;
 136         if (*p == 0)
 137                 return 0;
 138
 139         while (*p)
 140                 len += strlen(*p++) + 1;
 141
 142         buf = (char *)malloc(len);
 143         if (buf == NULL)
 144                 error("copy_argv: malloc");
 145
 146         p = argv;
 147         dst = buf;
 148         while ((src = *p++) != NULL) {
 149                 while ((*dst++ = *src++) != '\0')
 150                         ;
 151                 dst[-1] = ' ';
 152         }
 153         dst[-1] = '\0';
 154
 155         return buf;
 156 }
 157
 158 int
 159 main(int argc, char **argv)
 160 {
 161         char *cp;
 162         int op;
 163         int dflag;
 164         char *infile;
 165         int Oflag;
 166         long snaplen;
 167         int dlt;
 168         char *cmdbuf;
 169         pcap_t *pd;
 170         struct bpf_program fcode;
 171
 172 #ifdef WIN32
 173         if(wsockinit() != 0) return 1;
 174 #endif /* WIN32 */
 175
 176         dflag = 1;
 177         infile = NULL;
 178         Oflag = 1;
 179         snaplen = 68;
 180
 181         if ((cp = strrchr(argv[0], '/')) != NULL)
 182                 program_name = cp + 1;
 183         else
 184                 program_name = argv[0];
 185
 186         opterr = 0;
 187         while ((op = getopt(argc, argv, "dF:Os:")) != -1) {
 188                 switch (op) {
 189
 190                 case 'd':
 191                         ++dflag;
 192                         break;
 193
 194                 case 'F':
 195                         infile = optarg;
 196                         break;
 197
 198                 case 'O':
 199                         Oflag = 0;
 200                         break;
 201
 202                 case 's': {
 203                         char *end;
 204
 205                         snaplen = strtol(optarg, &end, 0);
 206                         if (optarg == end || *end != '\0'
 207                             || snaplen < 0 || snaplen > 65535)
 208                                 error("invalid snaplen %s", optarg);
 209                         else if (snaplen == 0)
 210                                 snaplen = 65535;
 211                         break;
 212                 }
 213
 214                 default:
 215                         usage();
 216                         /* NOTREACHED */
 217                 }
 218         }
 219
 220         if (optind >= argc) {
 221                 usage();
 222                 /* NOTREACHED */
 223         }
 224
 225         dlt = pcap_datalink_name_to_val(argv[optind]);
 226         if (dlt < 0)
 227                 error("invalid data link type %s", argv[optind]);
 228
 229         if (infile)
 230                 cmdbuf = read_infile(infile);
 231         else
 232                 cmdbuf = copy_argv(&argv[optind+1]);
 233
 234         pd = pcap_open_dead(dlt, snaplen);
 235         if (pd == NULL)
 236                 error("Can't open fake pcap_t");
 237
 238         if (pcap_compile(pd, &fcode, cmdbuf, Oflag, 0) < 0)
 239                 error("%s", pcap_geterr(pd));
 240         bpf_dump(&fcode, dflag);
 241         pcap_close(pd);
 242         exit(0);
 243 }
 244
 245 static void
 246 usage(void)
 247 {
 248         (void)fprintf(stderr, "%s, with %s\n", program_name,
 249             pcap_lib_version());
 250         (void)fprintf(stderr,
 251             "Usage: %s [-dO] [ -F file ] [ -s snaplen ] dlt [ expression ]\n",
 252             program_name);
 253         exit(1);
 254 }