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filtertest.c

/*
 * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000
 *    The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that: (1) source code distributions
 * retain the above copyright notice and this paragraph in its entirety, (2)
 * distributions including binary code include the above copyright notice and
 * this paragraph in its entirety in the documentation or other materials
 * provided with the distribution, and (3) all advertising materials mentioning
 * features or use of this software display the following acknowledgement:
 * ``This product includes software developed by the University of California,
 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
 * the University nor the names of its contributors may be used to endorse
 * or promote products derived from this software without specific prior
 * written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#ifndef lint
static const char copyright[] _U_ =
    "@(#) Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000\n\
The Regents of the University of California.  All rights reserved.\n";
static const char rcsid[] _U_ =
    "@(#) $Header: /tcpdump/master/libpcap/filtertest.c,v 1.2 2005/08/08 17:50:13 guy Exp $ (LBL)";
#endif

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <pcap.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>

#ifndef HAVE___ATTRIBUTE__
#define __attribute__(x)
#endif

static char *program_name;

/* Forwards */
static void usage(void) __attribute__((noreturn));
static void error(const char *, ...)
    __attribute__((noreturn, format (printf, 1, 2)));

extern int optind;
extern int opterr;
extern char *optarg;

/*
 * On Windows, we need to open the file in binary mode, so that
 * we get all the bytes specified by the size we get from "fstat()".
 * On UNIX, that's not necessary.  O_BINARY is defined on Windows;
 * we define it as 0 if it's not defined, so it does nothing.
 */
#ifndef O_BINARY
#define O_BINARY  0
#endif

static char *
read_infile(char *fname)
{
      register int i, fd, cc;
      register char *cp;
      struct stat buf;

      fd = open(fname, O_RDONLY|O_BINARY);
      if (fd < 0)
            error("can't open %s: %s", fname, pcap_strerror(errno));

      if (fstat(fd, &buf) < 0)
            error("can't stat %s: %s", fname, pcap_strerror(errno));

      cp = malloc((u_int)buf.st_size + 1);
      if (cp == NULL)
            error("malloc(%d) for %s: %s", (u_int)buf.st_size + 1,
                  fname, pcap_strerror(errno));
      cc = read(fd, cp, (u_int)buf.st_size);
      if (cc < 0)
            error("read %s: %s", fname, pcap_strerror(errno));
      if (cc != buf.st_size)
            error("short read %s (%d != %d)", fname, cc, (int)buf.st_size);

      close(fd);
      /* replace "# comment" with spaces */
      for (i = 0; i < cc; i++) {
            if (cp[i] == '#')
                  while (i < cc && cp[i] != '\n')
                        cp[i++] = ' ';
      }
      cp[cc] = '\0';
      return (cp);
}

/* VARARGS */
static void
error(const char *fmt, ...)
{
      va_list ap;

      (void)fprintf(stderr, "%s: ", program_name);
      va_start(ap, fmt);
      (void)vfprintf(stderr, fmt, ap);
      va_end(ap);
      if (*fmt) {
            fmt += strlen(fmt);
            if (fmt[-1] != '\n')
                  (void)fputc('\n', stderr);
      }
      exit(1);
      /* NOTREACHED */
}

/*
 * Copy arg vector into a new buffer, concatenating arguments with spaces.
 */
static char *
copy_argv(register char **argv)
{
      register char **p;
      register u_int len = 0;
      char *buf;
      char *src, *dst;

      p = argv;
      if (*p == 0)
            return 0;

      while (*p)
            len += strlen(*p++) + 1;

      buf = (char *)malloc(len);
      if (buf == NULL)
            error("copy_argv: malloc");

      p = argv;
      dst = buf;
      while ((src = *p++) != NULL) {
            while ((*dst++ = *src++) != '\0')
                  ;
            dst[-1] = ' ';
      }
      dst[-1] = '\0';

      return buf;
}

int
main(int argc, char **argv)
{
      char *cp;
      int op;
      int dflag;
      char *infile;
      int Oflag;
      long snaplen;
      int dlt;
      char *cmdbuf;
      pcap_t *pd;
      struct bpf_program fcode;

#ifdef WIN32
      if(wsockinit() != 0) return 1;
#endif /* WIN32 */

      dflag = 1;
      infile = NULL;
      Oflag = 1;
      snaplen = 68;
  
      if ((cp = strrchr(argv[0], '/')) != NULL)
            program_name = cp + 1;
      else
            program_name = argv[0];

      opterr = 0;
      while ((op = getopt(argc, argv, "dF:Os:")) != -1) {
            switch (op) {

            case 'd':
                  ++dflag;
                  break;

            case 'F':
                  infile = optarg;
                  break;

            case 'O':
                  Oflag = 0;
                  break;

            case 's': {
                  char *end;

                  snaplen = strtol(optarg, &end, 0);
                  if (optarg == end || *end != '\0'
                      || snaplen < 0 || snaplen > 65535)
                        error("invalid snaplen %s", optarg);
                  else if (snaplen == 0)
                        snaplen = 65535;
                  break;
            }

            default:
                  usage();
                  /* NOTREACHED */
            }
      }

      if (optind >= argc) {
            usage();
            /* NOTREACHED */
      }

      dlt = pcap_datalink_name_to_val(argv[optind]);
      if (dlt < 0)
            error("invalid data link type %s", argv[optind]);
      
      if (infile)
            cmdbuf = read_infile(infile);
      else
            cmdbuf = copy_argv(&argv[optind+1]);

      pd = pcap_open_dead(dlt, snaplen);
      if (pd == NULL)
            error("Can't open fake pcap_t");

      if (pcap_compile(pd, &fcode, cmdbuf, Oflag, 0) < 0)
            error("%s", pcap_geterr(pd));
      bpf_dump(&fcode, dflag);
      pcap_close(pd);
      exit(0);
}

static void
usage(void)
{
      (void)fprintf(stderr, "%s, with %s\n", program_name,
          pcap_lib_version());
      (void)fprintf(stderr,
          "Usage: %s [-dO] [ -F file ] [ -s snaplen ] dlt [ expression ]\n",
          program_name);
      exit(1);
}

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