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 #include "varattrs.h"
  23
  24 #ifndef lint
  25 static const char copyright[] _U_ =
  26     "@(#) Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000\n\
  27 The Regents of the University of California.  All rights reserved.\n";
  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 #ifdef _WIN32
  40   #include "getopt.h"
  41   #include "unix.h"
  42 #else
  43   #include <unistd.h>
  44 #endif
  45 #include <fcntl.h>
  46 #include <errno.h>
  47 #ifdef _WIN32
  48   #include <winsock2.h>
  49   #include <ws2tcpip.h>
  50 #else
  51   #include <sys/socket.h>
  52   #include <arpa/inet.h>
  53 #endif
  54 #include <sys/types.h>
  55 #include <sys/stat.h>
  56
  57 #include "pcap/funcattrs.h"
  58
  59 static char *program_name;
  60
  61 /* Forwards */
  62 static void PCAP_NORETURN usage(void);
  63 static void PCAP_NORETURN error(const char *, ...) PCAP_PRINTFLIKE(1, 2);
  64 static void warn(const char *, ...) PCAP_PRINTFLIKE(1, 2);
  65
  66 #ifdef BDEBUG
  67 int dflag;
  68 #endif
  69
  70 /*
  71  * On Windows, we need to open the file in binary mode, so that
  72  * we get all the bytes specified by the size we get from "fstat()".
  73  * On UNIX, that's not necessary.  O_BINARY is defined on Windows;
  74  * we define it as 0 if it's not defined, so it does nothing.
  75  */
  76 #ifndef O_BINARY
  77 #define O_BINARY        0
  78 #endif
  79
  80 static char *
  81 read_infile(char *fname)
  82 {
  83         register int i, fd, cc;
  84         register char *cp;
  85         struct stat buf;
  86
  87         fd = open(fname, O_RDONLY|O_BINARY);
  88         if (fd < 0)
  89                 error("can't open %s: %s", fname, pcap_strerror(errno));
  90
  91         if (fstat(fd, &buf) < 0)
  92                 error("can't stat %s: %s", fname, pcap_strerror(errno));
  93
  94         cp = malloc((u_int)buf.st_size + 1);
  95         if (cp == NULL)
  96                 error("malloc(%d) for %s: %s", (u_int)buf.st_size + 1,
  97                         fname, pcap_strerror(errno));
  98         cc = read(fd, cp, (u_int)buf.st_size);
  99         if (cc < 0)
 100                 error("read %s: %s", fname, pcap_strerror(errno));
 101         if (cc != buf.st_size)
 102                 error("short read %s (%d != %d)", fname, cc, (int)buf.st_size);
 103
 104         close(fd);
 105         /* replace "# comment" with spaces */
 106         for (i = 0; i < cc; i++) {
 107                 if (cp[i] == '#')
 108                         while (i < cc && cp[i] != '\n')
 109                                 cp[i++] = ' ';
 110         }
 111         cp[cc] = '\0';
 112         return (cp);
 113 }
 114
 115 /* VARARGS */
 116 static void
 117 error(const char *fmt, ...)
 118 {
 119         va_list ap;
 120
 121         (void)fprintf(stderr, "%s: ", program_name);
 122         va_start(ap, fmt);
 123         (void)vfprintf(stderr, fmt, ap);
 124         va_end(ap);
 125         if (*fmt) {
 126                 fmt += strlen(fmt);
 127                 if (fmt[-1] != '\n')
 128                         (void)fputc('\n', stderr);
 129         }
 130         exit(1);
 131         /* NOTREACHED */
 132 }
 133
 134 /* VARARGS */
 135 static void
 136 warn(const char *fmt, ...)
 137 {
 138         va_list ap;
 139
 140         (void)fprintf(stderr, "%s: WARNING: ", program_name);
 141         va_start(ap, fmt);
 142         (void)vfprintf(stderr, fmt, ap);
 143         va_end(ap);
 144         if (*fmt) {
 145                 fmt += strlen(fmt);
 146                 if (fmt[-1] != '\n')
 147                         (void)fputc('\n', stderr);
 148         }
 149 }
 150
 151 /*
 152  * Copy arg vector into a new buffer, concatenating arguments with spaces.
 153  */
 154 static char *
 155 copy_argv(register char **argv)
 156 {
 157         register char **p;
 158         register u_int len = 0;
 159         char *buf;
 160         char *src, *dst;
 161
 162         p = argv;
 163         if (*p == 0)
 164                 return 0;
 165
 166         while (*p)
 167                 len += strlen(*p++) + 1;
 168
 169         buf = (char *)malloc(len);
 170         if (buf == NULL)
 171                 error("copy_argv: malloc");
 172
 173         p = argv;
 174         dst = buf;
 175         while ((src = *p++) != NULL) {
 176                 while ((*dst++ = *src++) != '\0')
 177                         ;
 178                 dst[-1] = ' ';
 179         }
 180         dst[-1] = '\0';
 181
 182         return buf;
 183 }
 184
 185 int
 186 main(int argc, char **argv)
 187 {
 188         char *cp;
 189         int op;
 190 #ifndef BDEBUG
 191         int dflag;
 192 #endif
 193         char *infile;
 194         int Oflag;
 195         long snaplen;
 196         char *p;
 197         int dlt;
 198         int have_fcode = 0;
 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 (pcap_wsockinit() != 0)
 206                 return 1;
 207 #endif /* _WIN32 */
 208
 209 #ifndef BDEBUG
 210         dflag = 1;
 211 #else
 212         /* if optimizer debugging is enabled, output DOT graph
 213          * `dflag=4' is equivalent to -dddd to follow -d/-dd/-ddd
 214          * convention in tcpdump command line
 215          */
 216         dflag = 4;
 217 #endif
 218         infile = NULL;
 219         Oflag = 1;
 220         snaplen = 68;
 221
 222         if ((cp = strrchr(argv[0], '/')) != NULL)
 223                 program_name = cp + 1;
 224         else
 225                 program_name = argv[0];
 226
 227         opterr = 0;
 228         while ((op = getopt(argc, argv, "dF:m:Os:")) != -1) {
 229                 switch (op) {
 230
 231                 case 'd':
 232                         ++dflag;
 233                         break;
 234
 235                 case 'F':
 236                         infile = optarg;
 237                         break;
 238
 239                 case 'O':
 240                         Oflag = 0;
 241                         break;
 242
 243                 case 'm': {
 244                         bpf_u_int32 addr;
 245
 246                         switch (inet_pton(AF_INET, optarg, &addr)) {
 247
 248                         case 0:
 249                                 error("invalid netmask %s", optarg);
 250                                 break;
 251
 252                         case -1:
 253                                 error("invalid netmask %s: %s", optarg,
 254                                     pcap_strerror(errno));
 255                                 break;
 256
 257                         case 1:
 258                                 netmask = addr;
 259                                 break;
 260                         }
 261                         break;
 262                 }
 263
 264                 case 's': {
 265                         char *end;
 266
 267                         snaplen = strtol(optarg, &end, 0);
 268                         if (optarg == end || *end != '\0'
 269                             || snaplen < 0 || snaplen > 65535)
 270                                 error("invalid snaplen %s", optarg);
 271                         else if (snaplen == 0)
 272                                 snaplen = 65535;
 273                         break;
 274                 }
 275
 276                 default:
 277                         usage();
 278                         /* NOTREACHED */
 279                 }
 280         }
 281
 282         if (optind >= argc) {
 283                 usage();
 284                 /* NOTREACHED */
 285         }
 286
 287         dlt = pcap_datalink_name_to_val(argv[optind]);
 288         if (dlt < 0) {
 289                 dlt = (int)strtol(argv[optind], &p, 10);
 290                 if (p == argv[optind] || *p != '\0')
 291                         error("invalid data link type %s", argv[optind]);
 292         }
 293
 294         if (infile)
 295                 cmdbuf = read_infile(infile);
 296         else
 297                 cmdbuf = copy_argv(&argv[optind+1]);
 298
 299         pd = pcap_open_dead(dlt, snaplen);
 300         if (pd == NULL)
 301                 error("Can't open fake pcap_t");
 302
 303         if (pcap_compile(pd, &fcode, cmdbuf, Oflag, netmask) < 0)
 304                 error("%s", pcap_geterr(pd));
 305
 306         have_fcode = 1;
 307         if (!bpf_validate(fcode.bf_insns, fcode.bf_len))
 308                 warn("Filter doesn't pass validation");
 309
 310 #ifdef BDEBUG
 311         if (cmdbuf != NULL) {
 312                 // replace line feed with space
 313                 for (cp = cmdbuf; *cp != '\0'; ++cp) {
 314                         if (*cp == '\r' || *cp == '\n') {
 315                                 *cp = ' ';
 316                         }
 317                 }
 318                 // only show machine code if BDEBUG defined, since dflag > 3
 319                 printf("machine codes for filter: %s\n", cmdbuf);
 320         } else
 321                 printf("machine codes for empty filter:\n");
 322 #endif
 323
 324         bpf_dump(&fcode, dflag);
 325         free(cmdbuf);
 326         if (have_fcode)
 327                 pcap_freecode (&fcode);
 328         pcap_close(pd);
 329         exit(0);
 330 }
 331
 332 static void
 333 usage(void)
 334 {
 335         (void)fprintf(stderr, "%s, with %s\n", program_name,
 336             pcap_lib_version());
 337         (void)fprintf(stderr,
 338             "Usage: %s [-dO] [ -F file ] [ -m netmask] [ -s snaplen ] dlt [ expression ]\n",
 339             program_name);
 340         exit(1);
 341 }