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   #include "unix.h"
  40 #else
  41   #include <unistd.h>
  42 #endif
  43 #include <fcntl.h>
  44 #include <errno.h>
  45 #ifdef _WIN32
  46   #include <winsock2.h>
  47   typedef unsigned __int32 in_addr_t;
  48 #else
  49   #include <arpa/inet.h>
  50 #endif
  51 #include <sys/types.h>
  52 #include <sys/stat.h>
  53
  54 #include "pcap/funcattrs.h"
  55
  56 static char *program_name;
  57
  58 /* Forwards */
  59 static void PCAP_NORETURN usage(void);
  60 static void PCAP_NORETURN error(const char *, ...) PCAP_PRINTFLIKE(1, 2);
  61 static void warn(const char *, ...) PCAP_PRINTFLIKE(1, 2);
  62
  63 #ifdef BDEBUG
  64 int dflag;
  65 #endif
  66
  67 /*
  68  * On Windows, we need to open the file in binary mode, so that
  69  * we get all the bytes specified by the size we get from "fstat()".
  70  * On UNIX, that's not necessary.  O_BINARY is defined on Windows;
  71  * we define it as 0 if it's not defined, so it does nothing.
  72  */
  73 #ifndef O_BINARY
  74 #define O_BINARY        0
  75 #endif
  76
  77 static char *
  78 read_infile(char *fname)
  79 {
  80         register int i, fd, cc;
  81         register char *cp;
  82         struct stat buf;
  83
  84         fd = open(fname, O_RDONLY|O_BINARY);
  85         if (fd < 0)
  86                 error("can't open %s: %s", fname, pcap_strerror(errno));
  87
  88         if (fstat(fd, &buf) < 0)
  89                 error("can't stat %s: %s", fname, pcap_strerror(errno));
  90
  91         cp = malloc((u_int)buf.st_size + 1);
  92         if (cp == NULL)
  93                 error("malloc(%d) for %s: %s", (u_int)buf.st_size + 1,
  94                         fname, pcap_strerror(errno));
  95         cc = read(fd, cp, (u_int)buf.st_size);
  96         if (cc < 0)
  97                 error("read %s: %s", fname, pcap_strerror(errno));
  98         if (cc != buf.st_size)
  99                 error("short read %s (%d != %d)", fname, cc, (int)buf.st_size);
 100
 101         close(fd);
 102         /* replace "# comment" with spaces */
 103         for (i = 0; i < cc; i++) {
 104                 if (cp[i] == '#')
 105                         while (i < cc && cp[i] != '\n')
 106                                 cp[i++] = ' ';
 107         }
 108         cp[cc] = '\0';
 109         return (cp);
 110 }
 111
 112 /* VARARGS */
 113 static void
 114 error(const char *fmt, ...)
 115 {
 116         va_list ap;
 117
 118         (void)fprintf(stderr, "%s: ", program_name);
 119         va_start(ap, fmt);
 120         (void)vfprintf(stderr, fmt, ap);
 121         va_end(ap);
 122         if (*fmt) {
 123                 fmt += strlen(fmt);
 124                 if (fmt[-1] != '\n')
 125                         (void)fputc('\n', stderr);
 126         }
 127         exit(1);
 128         /* NOTREACHED */
 129 }
 130
 131 /* VARARGS */
 132 static void
 133 warn(const char *fmt, ...)
 134 {
 135         va_list ap;
 136
 137         (void)fprintf(stderr, "%s: WARNING: ", program_name);
 138         va_start(ap, fmt);
 139         (void)vfprintf(stderr, fmt, ap);
 140         va_end(ap);
 141         if (*fmt) {
 142                 fmt += strlen(fmt);
 143                 if (fmt[-1] != '\n')
 144                         (void)fputc('\n', stderr);
 145         }
 146 }
 147
 148 /*
 149  * Copy arg vector into a new buffer, concatenating arguments with spaces.
 150  */
 151 static char *
 152 copy_argv(register char **argv)
 153 {
 154         register char **p;
 155         register u_int len = 0;
 156         char *buf;
 157         char *src, *dst;
 158
 159         p = argv;
 160         if (*p == 0)
 161                 return 0;
 162
 163         while (*p)
 164                 len += strlen(*p++) + 1;
 165
 166         buf = (char *)malloc(len);
 167         if (buf == NULL)
 168                 error("copy_argv: malloc");
 169
 170         p = argv;
 171         dst = buf;
 172         while ((src = *p++) != NULL) {
 173                 while ((*dst++ = *src++) != '\0')
 174                         ;
 175                 dst[-1] = ' ';
 176         }
 177         dst[-1] = '\0';
 178
 179         return buf;
 180 }
 181
 182 int
 183 main(int argc, char **argv)
 184 {
 185         char *cp;
 186         int op;
 187 #ifndef BDEBUG
 188         int dflag;
 189 #endif
 190         char *infile;
 191         int Oflag;
 192         long snaplen;
 193         char *p;
 194         int dlt;
 195         int have_fcode = 0;
 196         bpf_u_int32 netmask = PCAP_NETMASK_UNKNOWN;
 197         char *cmdbuf;
 198         pcap_t *pd;
 199         struct bpf_program fcode;
 200
 201 #ifdef _WIN32
 202         if (pcap_wsockinit() != 0)
 203                 return 1;
 204 #endif /* _WIN32 */
 205
 206 #ifndef BDEBUG
 207         dflag = 1;
 208 #else
 209         /* if optimizer debugging is enabled, output DOT graph
 210          * `dflag=4' is equivalent to -dddd to follow -d/-dd/-ddd
 211          * convention in tcpdump command line
 212          */
 213         dflag = 4;
 214 #endif
 215         infile = NULL;
 216         Oflag = 1;
 217         snaplen = 68;
 218
 219         if ((cp = strrchr(argv[0], '/')) != NULL)
 220                 program_name = cp + 1;
 221         else
 222                 program_name = argv[0];
 223
 224         opterr = 0;
 225         while ((op = getopt(argc, argv, "dF:m:Os:")) != -1) {
 226                 switch (op) {
 227
 228                 case 'd':
 229                         ++dflag;
 230                         break;
 231
 232                 case 'F':
 233                         infile = optarg;
 234                         break;
 235
 236                 case 'O':
 237                         Oflag = 0;
 238                         break;
 239
 240                 case 'm': {
 241                         in_addr_t addr;
 242
 243                         addr = inet_addr(optarg);
 244                         if (addr == (in_addr_t)(-1))
 245                                 error("invalid netmask %s", optarg);
 246                         netmask = addr;
 247                         break;
 248                 }
 249
 250                 case 's': {
 251                         char *end;
 252
 253                         snaplen = strtol(optarg, &end, 0);
 254                         if (optarg == end || *end != '\0'
 255                             || snaplen < 0 || snaplen > 65535)
 256                                 error("invalid snaplen %s", optarg);
 257                         else if (snaplen == 0)
 258                                 snaplen = 65535;
 259                         break;
 260                 }
 261
 262                 default:
 263                         usage();
 264                         /* NOTREACHED */
 265                 }
 266         }
 267
 268         if (optind >= argc) {
 269                 usage();
 270                 /* NOTREACHED */
 271         }
 272
 273         dlt = pcap_datalink_name_to_val(argv[optind]);
 274         if (dlt < 0) {
 275                 dlt = (int)strtol(argv[optind], &p, 10);
 276                 if (p == argv[optind] || *p != '\0')
 277                         error("invalid data link type %s", argv[optind]);
 278         }
 279
 280         if (infile)
 281                 cmdbuf = read_infile(infile);
 282         else
 283                 cmdbuf = copy_argv(&argv[optind+1]);
 284
 285         pd = pcap_open_dead(dlt, snaplen);
 286         if (pd == NULL)
 287                 error("Can't open fake pcap_t");
 288
 289         if (pcap_compile(pd, &fcode, cmdbuf, Oflag, netmask) < 0)
 290                 error("%s", pcap_geterr(pd));
 291
 292         have_fcode = 1;
 293         if (!bpf_validate(fcode.bf_insns, fcode.bf_len))
 294                 warn("Filter doesn't pass validation");
 295
 296 #ifdef BDEBUG
 297         if (cmdbuf != NULL) {
 298                 // replace line feed with space
 299                 for (cp = cmdbuf; *cp != '\0'; ++cp) {
 300                         if (*cp == '\r' || *cp == '\n') {
 301                                 *cp = ' ';
 302                         }
 303                 }
 304                 // only show machine code if BDEBUG defined, since dflag > 3
 305                 printf("machine codes for filter: %s\n", cmdbuf);
 306         } else
 307                 printf("machine codes for empty filter:\n");
 308 #endif
 309
 310         bpf_dump(&fcode, dflag);
 311         free(cmdbuf);
 312         if (have_fcode)
 313                 pcap_freecode (&fcode);
 314         pcap_close(pd);
 315         exit(0);
 316 }
 317
 318 static void
 319 usage(void)
 320 {
 321         (void)fprintf(stderr, "%s, with %s\n", program_name,
 322             pcap_lib_version());
 323         (void)fprintf(stderr,
 324             "Usage: %s [-dO] [ -F file ] [ -m netmask] [ -s snaplen ] dlt [ expression ]\n",
 325             program_name);
 326         exit(1);
 327 }