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 <arpa/inet.h>
  43 #include <sys/types.h>
  44 #include <sys/stat.h>
  45
  46 #ifndef HAVE___ATTRIBUTE__
  47 #define __attribute__(x)
  48 #endif
  49
  50 static char *program_name;
  51
  52 /* Forwards */
  53 static void usage(void) __attribute__((noreturn));
  54 static void error(const char *, ...)
  55     __attribute__((noreturn, format (printf, 1, 2)));
  56
  57 extern int optind;
  58 extern int opterr;
  59 extern char *optarg;
  60
  61 /*
  62  * On Windows, we need to open the file in binary mode, so that
  63  * we get all the bytes specified by the size we get from "fstat()".
  64  * On UNIX, that's not necessary.  O_BINARY is defined on Windows;
  65  * we define it as 0 if it's not defined, so it does nothing.
  66  */
  67 #ifndef O_BINARY
  68 #define O_BINARY        0
  69 #endif
  70
  71 static char *
  72 read_infile(char *fname)
  73 {
  74         register int i, fd, cc;
  75         register char *cp;
  76         struct stat buf;
  77
  78         fd = open(fname, O_RDONLY|O_BINARY);
  79         if (fd < 0)
  80                 error("can't open %s: %s", fname, pcap_strerror(errno));
  81
  82         if (fstat(fd, &buf) < 0)
  83                 error("can't stat %s: %s", fname, pcap_strerror(errno));
  84
  85         cp = malloc((u_int)buf.st_size + 1);
  86         if (cp == NULL)
  87                 error("malloc(%d) for %s: %s", (u_int)buf.st_size + 1,
  88                         fname, pcap_strerror(errno));
  89         cc = read(fd, cp, (u_int)buf.st_size);
  90         if (cc < 0)
  91                 error("read %s: %s", fname, pcap_strerror(errno));
  92         if (cc != buf.st_size)
  93                 error("short read %s (%d != %d)", fname, cc, (int)buf.st_size);
  94
  95         close(fd);
  96         /* replace "# comment" with spaces */
  97         for (i = 0; i < cc; i++) {
  98                 if (cp[i] == '#')
  99                         while (i < cc && cp[i] != '\n')
 100                                 cp[i++] = ' ';
 101         }
 102         cp[cc] = '\0';
 103         return (cp);
 104 }
 105
 106 /* VARARGS */
 107 static void
 108 error(const char *fmt, ...)
 109 {
 110         va_list ap;
 111
 112         (void)fprintf(stderr, "%s: ", program_name);
 113         va_start(ap, fmt);
 114         (void)vfprintf(stderr, fmt, ap);
 115         va_end(ap);
 116         if (*fmt) {
 117                 fmt += strlen(fmt);
 118                 if (fmt[-1] != '\n')
 119                         (void)fputc('\n', stderr);
 120         }
 121         exit(1);
 122         /* NOTREACHED */
 123 }
 124
 125 /*
 126  * Copy arg vector into a new buffer, concatenating arguments with spaces.
 127  */
 128 static char *
 129 copy_argv(register char **argv)
 130 {
 131         register char **p;
 132         register u_int len = 0;
 133         char *buf;
 134         char *src, *dst;
 135
 136         p = argv;
 137         if (*p == 0)
 138                 return 0;
 139
 140         while (*p)
 141                 len += strlen(*p++) + 1;
 142
 143         buf = (char *)malloc(len);
 144         if (buf == NULL)
 145                 error("copy_argv: malloc");
 146
 147         p = argv;
 148         dst = buf;
 149         while ((src = *p++) != NULL) {
 150                 while ((*dst++ = *src++) != '\0')
 151                         ;
 152                 dst[-1] = ' ';
 153         }
 154         dst[-1] = '\0';
 155
 156         return buf;
 157 }
 158
 159 int
 160 main(int argc, char **argv)
 161 {
 162         char *cp;
 163         int op;
 164         int dflag;
 165         char *infile;
 166         int Oflag;
 167         long snaplen;
 168         int dlt;
 169         bpf_u_int32 netmask = PCAP_NETMASK_UNKNOWN;
 170         char *cmdbuf;
 171         pcap_t *pd;
 172         struct bpf_program fcode;
 173
 174 #ifdef WIN32
 175         if(wsockinit() != 0) return 1;
 176 #endif /* WIN32 */
 177
 178         dflag = 1;
 179         infile = NULL;
 180         Oflag = 1;
 181         snaplen = 68;
 182
 183         if ((cp = strrchr(argv[0], '/')) != NULL)
 184                 program_name = cp + 1;
 185         else
 186                 program_name = argv[0];
 187
 188         opterr = 0;
 189         while ((op = getopt(argc, argv, "dF:m:Os:")) != -1) {
 190                 switch (op) {
 191
 192                 case 'd':
 193                         ++dflag;
 194                         break;
 195
 196                 case 'F':
 197                         infile = optarg;
 198                         break;
 199
 200                 case 'O':
 201                         Oflag = 0;
 202                         break;
 203
 204                 case 'm': {
 205                         in_addr_t addr;
 206
 207                         addr = inet_addr(optarg);
 208                         if (addr == INADDR_NONE)
 209                                 error("invalid netmask %s", optarg);
 210                         netmask = addr;
 211                         break;
 212                 }
 213
 214                 case 's': {
 215                         char *end;
 216
 217                         snaplen = strtol(optarg, &end, 0);
 218                         if (optarg == end || *end != '\0'
 219                             || snaplen < 0 || snaplen > 65535)
 220                                 error("invalid snaplen %s", optarg);
 221                         else if (snaplen == 0)
 222                                 snaplen = 65535;
 223                         break;
 224                 }
 225
 226                 default:
 227                         usage();
 228                         /* NOTREACHED */
 229                 }
 230         }
 231
 232         if (optind >= argc) {
 233                 usage();
 234                 /* NOTREACHED */
 235         }
 236
 237         dlt = pcap_datalink_name_to_val(argv[optind]);
 238         if (dlt < 0)
 239                 error("invalid data link type %s", argv[optind]);
 240
 241         if (infile)
 242                 cmdbuf = read_infile(infile);
 243         else
 244                 cmdbuf = copy_argv(&argv[optind+1]);
 245
 246         pd = pcap_open_dead(dlt, snaplen);
 247         if (pd == NULL)
 248                 error("Can't open fake pcap_t");
 249
 250         if (pcap_compile(pd, &fcode, cmdbuf, Oflag, netmask) < 0)
 251                 error("%s", pcap_geterr(pd));
 252         bpf_dump(&fcode, dflag);
 253         pcap_close(pd);
 254         exit(0);
 255 }
 256
 257 static void
 258 usage(void)
 259 {
 260         (void)fprintf(stderr, "%s, with %s\n", program_name,
 261             pcap_lib_version());
 262         (void)fprintf(stderr,
 263             "Usage: %s [-dO] [ -F file ] [ -m netmask] [ -s snaplen ] dlt [ expression ]\n",
 264             program_name);
 265         exit(1);
 266 }