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