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