The Tcpdump Group git mirrors - libpcap/blob - tests/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 #endif
  27
  28 #ifdef HAVE_CONFIG_H
  29 #include "config.h"
  30 #endif
  31
  32 #include <pcap.h>
  33 #include <stdio.h>
  34 #include <stdlib.h>
  35 #include <string.h>
  36 #include <stdarg.h>
  37 #ifdef _WIN32
  38 #include "getopt.h"
  39 #else
  40 #include <unistd.h>
  41 #endif
  42 #include <fcntl.h>
  43 #include <errno.h>
  44 #ifdef _WIN32
  45   #include <winsock2.h>
  46   typedef unsigned __int32 in_addr_t;
  47 #else
  48   #include <arpa/inet.h>
  49 #endif
  50 #include <sys/types.h>
  51 #include <sys/stat.h>
  52
  53 /*
  54  * This was introduced by Clang:
  55  *
  56  *     http://clang.llvm.org/docs/LanguageExtensions.html#has-attribute
  57  *
  58  * in some version (which version?); it has been picked up by GCC 5.0.
  59  */
  60 #ifndef __has_attribute
  61   /*
  62    * It's a macro, so you can check whether it's defined to check
  63    * whether it's supported.
  64    *
  65    * If it's not, define it to always return 0, so that we move on to
  66    * the fallback checks.
  67    */
  68   #define __has_attribute(x) 0
  69 #endif
  70
  71 #if __has_attribute(noreturn) \
  72     || (defined(__GNUC__) && ((__GNUC__ * 100 + __GNUC_MINOR__) >= 205)) \
  73     || (defined(__SUNPRO_C) && (__SUNPRO_C >= 0x590)) \
  74     || (defined(__xlC__) && __xlC__ >= 0x0A01) \
  75     || (defined(__HP_aCC) && __HP_aCC >= 61000)
  76   /*
  77    * Compiler with support for it, or GCC 2.5 and later, or Solaris Studio 12
  78    * (Sun C 5.9) and later, or IBM XL C 10.1 and later (do any earlier
  79    * versions of XL C support this?), or HP aCC A.06.10 and later.
  80    */
  81   #define PCAP_NORETURN __attribute((noreturn))
  82 #elif defined( _MSC_VER )
  83   #define PCAP_NORETURN __declspec(noreturn)
  84 #else
  85   #define PCAP_NORETURN
  86 #endif
  87
  88 #if __has_attribute(__format__) \
  89     || (defined(__GNUC__) && ((__GNUC__ * 100 + __GNUC_MINOR__) >= 203)) \
  90     || (defined(__xlC__) && __xlC__ >= 0x0A01) \
  91     || (defined(__HP_aCC) && __HP_aCC >= 61000)
  92   /*
  93    * Compiler with support for it, or GCC 2.3 and later, or IBM XL C 10.1
  94    * and later (do any earlier versions of XL C support this?),
  95    * or HP aCC A.06.10 and later.
  96    */
  97   #define PCAP_PRINTFLIKE(x,y) __attribute__((__format__(__printf__,x,y)))
  98 #else
  99   #define PCAP_PRINTFLIKE(x,y)
 100 #endif
 101
 102 static char *program_name;
 103
 104 /* Forwards */
 105 static void PCAP_NORETURN usage(void);
 106 static void PCAP_NORETURN error(const char *, ...) PCAP_PRINTFLIKE(1, 2);
 107 static void warn(const char *, ...) PCAP_PRINTFLIKE(1, 2);
 108
 109 #ifdef BDEBUG
 110 int dflag;
 111 #endif
 112
 113 /*
 114  * On Windows, we need to open the file in binary mode, so that
 115  * we get all the bytes specified by the size we get from "fstat()".
 116  * On UNIX, that's not necessary.  O_BINARY is defined on Windows;
 117  * we define it as 0 if it's not defined, so it does nothing.
 118  */
 119 #ifndef O_BINARY
 120 #define O_BINARY        0
 121 #endif
 122
 123 static char *
 124 read_infile(char *fname)
 125 {
 126         register int i, fd, cc;
 127         register char *cp;
 128         struct stat buf;
 129
 130         fd = open(fname, O_RDONLY|O_BINARY);
 131         if (fd < 0)
 132                 error("can't open %s: %s", fname, pcap_strerror(errno));
 133
 134         if (fstat(fd, &buf) < 0)
 135                 error("can't stat %s: %s", fname, pcap_strerror(errno));
 136
 137         cp = malloc((u_int)buf.st_size + 1);
 138         if (cp == NULL)
 139                 error("malloc(%d) for %s: %s", (u_int)buf.st_size + 1,
 140                         fname, pcap_strerror(errno));
 141         cc = read(fd, cp, (u_int)buf.st_size);
 142         if (cc < 0)
 143                 error("read %s: %s", fname, pcap_strerror(errno));
 144         if (cc != buf.st_size)
 145                 error("short read %s (%d != %d)", fname, cc, (int)buf.st_size);
 146
 147         close(fd);
 148         /* replace "# comment" with spaces */
 149         for (i = 0; i < cc; i++) {
 150                 if (cp[i] == '#')
 151                         while (i < cc && cp[i] != '\n')
 152                                 cp[i++] = ' ';
 153         }
 154         cp[cc] = '\0';
 155         return (cp);
 156 }
 157
 158 /* VARARGS */
 159 static void
 160 error(const char *fmt, ...)
 161 {
 162         va_list ap;
 163
 164         (void)fprintf(stderr, "%s: ", program_name);
 165         va_start(ap, fmt);
 166         (void)vfprintf(stderr, fmt, ap);
 167         va_end(ap);
 168         if (*fmt) {
 169                 fmt += strlen(fmt);
 170                 if (fmt[-1] != '\n')
 171                         (void)fputc('\n', stderr);
 172         }
 173         exit(1);
 174         /* NOTREACHED */
 175 }
 176
 177 /* VARARGS */
 178 static void
 179 warn(const char *fmt, ...)
 180 {
 181         va_list ap;
 182
 183         (void)fprintf(stderr, "%s: WARNING: ", program_name);
 184         va_start(ap, fmt);
 185         (void)vfprintf(stderr, fmt, ap);
 186         va_end(ap);
 187         if (*fmt) {
 188                 fmt += strlen(fmt);
 189                 if (fmt[-1] != '\n')
 190                         (void)fputc('\n', stderr);
 191         }
 192 }
 193
 194 /*
 195  * Copy arg vector into a new buffer, concatenating arguments with spaces.
 196  */
 197 static char *
 198 copy_argv(register char **argv)
 199 {
 200         register char **p;
 201         register u_int len = 0;
 202         char *buf;
 203         char *src, *dst;
 204
 205         p = argv;
 206         if (*p == 0)
 207                 return 0;
 208
 209         while (*p)
 210                 len += strlen(*p++) + 1;
 211
 212         buf = (char *)malloc(len);
 213         if (buf == NULL)
 214                 error("copy_argv: malloc");
 215
 216         p = argv;
 217         dst = buf;
 218         while ((src = *p++) != NULL) {
 219                 while ((*dst++ = *src++) != '\0')
 220                         ;
 221                 dst[-1] = ' ';
 222         }
 223         dst[-1] = '\0';
 224
 225         return buf;
 226 }
 227
 228 int
 229 main(int argc, char **argv)
 230 {
 231         char *cp;
 232         int op;
 233 #ifndef BDEBUG
 234         int dflag;
 235 #endif
 236         char *infile;
 237         int Oflag;
 238         long snaplen;
 239         char *p;
 240         int dlt;
 241         bpf_u_int32 netmask = PCAP_NETMASK_UNKNOWN;
 242         char *cmdbuf;
 243         pcap_t *pd;
 244         struct bpf_program fcode;
 245
 246 #ifdef _WIN32
 247         if(wsockinit() != 0) return 1;
 248 #endif /* _WIN32 */
 249
 250 #ifndef BDEBUG
 251         dflag = 1;
 252 #else
 253         /* if optimizer debugging is enabled, output DOT graph
 254          * `dflag=4' is equivalent to -dddd to follow -d/-dd/-ddd
 255          * convention in tcpdump command line
 256          */
 257         dflag = 4;
 258 #endif
 259         infile = NULL;
 260         Oflag = 1;
 261         snaplen = 68;
 262
 263         if ((cp = strrchr(argv[0], '/')) != NULL)
 264                 program_name = cp + 1;
 265         else
 266                 program_name = argv[0];
 267
 268         opterr = 0;
 269         while ((op = getopt(argc, argv, "dF:m:Os:")) != -1) {
 270                 switch (op) {
 271
 272                 case 'd':
 273                         ++dflag;
 274                         break;
 275
 276                 case 'F':
 277                         infile = optarg;
 278                         break;
 279
 280                 case 'O':
 281                         Oflag = 0;
 282                         break;
 283
 284                 case 'm': {
 285                         in_addr_t addr;
 286
 287                         addr = inet_addr(optarg);
 288                         if (addr == (in_addr_t)(-1))
 289                                 error("invalid netmask %s", optarg);
 290                         netmask = addr;
 291                         break;
 292                 }
 293
 294                 case 's': {
 295                         char *end;
 296
 297                         snaplen = strtol(optarg, &end, 0);
 298                         if (optarg == end || *end != '\0'
 299                             || snaplen < 0 || snaplen > 65535)
 300                                 error("invalid snaplen %s", optarg);
 301                         else if (snaplen == 0)
 302                                 snaplen = 65535;
 303                         break;
 304                 }
 305
 306                 default:
 307                         usage();
 308                         /* NOTREACHED */
 309                 }
 310         }
 311
 312         if (optind >= argc) {
 313                 usage();
 314                 /* NOTREACHED */
 315         }
 316
 317         dlt = pcap_datalink_name_to_val(argv[optind]);
 318         if (dlt < 0) {
 319                 dlt = (int)strtol(argv[optind], &p, 10);
 320                 if (p == argv[optind] || *p != '\0')
 321                         error("invalid data link type %s", argv[optind]);
 322         }
 323
 324         if (infile)
 325                 cmdbuf = read_infile(infile);
 326         else
 327                 cmdbuf = copy_argv(&argv[optind+1]);
 328
 329         pd = pcap_open_dead(dlt, snaplen);
 330         if (pd == NULL)
 331                 error("Can't open fake pcap_t");
 332
 333         if (pcap_compile(pd, &fcode, cmdbuf, Oflag, netmask) < 0)
 334                 error("%s", pcap_geterr(pd));
 335
 336         if (!bpf_validate(fcode.bf_insns, fcode.bf_len))
 337                 warn("Filter doesn't pass validation");
 338
 339 #ifdef BDEBUG
 340         // replace line feed with space
 341         for (cp = cmdbuf; *cp != '\0'; ++cp) {
 342                 if (*cp == '\r' || *cp == '\n') {
 343                         *cp = ' ';
 344                 }
 345         }
 346         // only show machine code if BDEBUG defined, since dflag > 3
 347         printf("machine codes for filter: %s\n", cmdbuf);
 348 #endif
 349
 350         bpf_dump(&fcode, dflag);
 351         pcap_close(pd);
 352         exit(0);
 353 }
 354
 355 static void
 356 usage(void)
 357 {
 358         (void)fprintf(stderr, "%s, with %s\n", program_name,
 359             pcap_lib_version());
 360         (void)fprintf(stderr,
 361             "Usage: %s [-dO] [ -F file ] [ -m netmask] [ -s snaplen ] dlt [ expression ]\n",
 362             program_name);
 363         exit(1);
 364 }