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 #ifdef BDEBUG
60 /*
61 * We have pcap_set_optimizer_debug() and pcap_set_print_dot_graph() in
62 * libpcap; declare them (they're not declared by any libpcap header,
63 * because they're special hacks, only available if libpcap was configured
64 * to include them, and only intended for use by libpcap developers trying
65 * to debug the optimizer for filter expressions).
66 */
67 PCAP_API void pcap_set_optimizer_debug(int);
68 PCAP_API void pcap_set_print_dot_graph(int);
69 #endif
70
71 static char *program_name;
72
73 /* Forwards */
74 static void PCAP_NORETURN usage(void);
75 static void PCAP_NORETURN error(const char *, ...) PCAP_PRINTFLIKE(1, 2);
76 static void warn(const char *, ...) PCAP_PRINTFLIKE(1, 2);
77
78 /*
79 * On Windows, we need to open the file in binary mode, so that
80 * we get all the bytes specified by the size we get from "fstat()".
81 * On UNIX, that's not necessary. O_BINARY is defined on Windows;
82 * we define it as 0 if it's not defined, so it does nothing.
83 */
84 #ifndef O_BINARY
85 #define O_BINARY 0
86 #endif
87
88 static char *
read_infile(char * fname)89 read_infile(char *fname)
90 {
91 register int i, fd, cc;
92 register char *cp;
93 struct stat buf;
94
95 fd = open(fname, O_RDONLY|O_BINARY);
96 if (fd < 0)
97 error("can't open %s: %s", fname, pcap_strerror(errno));
98
99 if (fstat(fd, &buf) < 0)
100 error("can't stat %s: %s", fname, pcap_strerror(errno));
101
102 cp = malloc((u_int)buf.st_size + 1);
103 if (cp == NULL)
104 error("malloc(%d) for %s: %s", (u_int)buf.st_size + 1,
105 fname, pcap_strerror(errno));
106 cc = read(fd, cp, (u_int)buf.st_size);
107 if (cc < 0)
108 error("read %s: %s", fname, pcap_strerror(errno));
109 if (cc != buf.st_size)
110 error("short read %s (%d != %d)", fname, cc, (int)buf.st_size);
111
112 close(fd);
113 /* replace "# comment" with spaces */
114 for (i = 0; i < cc; i++) {
115 if (cp[i] == '#')
116 while (i < cc && cp[i] != '\n')
117 cp[i++] = ' ';
118 }
119 cp[cc] = '\0';
120 return (cp);
121 }
122
123 /* VARARGS */
124 static void
error(const char * fmt,...)125 error(const char *fmt, ...)
126 {
127 va_list ap;
128
129 (void)fprintf(stderr, "%s: ", program_name);
130 va_start(ap, fmt);
131 (void)vfprintf(stderr, fmt, ap);
132 va_end(ap);
133 if (*fmt) {
134 fmt += strlen(fmt);
135 if (fmt[-1] != '\n')
136 (void)fputc('\n', stderr);
137 }
138 exit(1);
139 /* NOTREACHED */
140 }
141
142 /* VARARGS */
143 static void
warn(const char * fmt,...)144 warn(const char *fmt, ...)
145 {
146 va_list ap;
147
148 (void)fprintf(stderr, "%s: WARNING: ", program_name);
149 va_start(ap, fmt);
150 (void)vfprintf(stderr, fmt, ap);
151 va_end(ap);
152 if (*fmt) {
153 fmt += strlen(fmt);
154 if (fmt[-1] != '\n')
155 (void)fputc('\n', stderr);
156 }
157 }
158
159 /*
160 * Copy arg vector into a new buffer, concatenating arguments with spaces.
161 */
162 static char *
copy_argv(register char ** argv)163 copy_argv(register char **argv)
164 {
165 register char **p;
166 register u_int len = 0;
167 char *buf;
168 char *src, *dst;
169
170 p = argv;
171 if (*p == 0)
172 return 0;
173
174 while (*p)
175 len += strlen(*p++) + 1;
176
177 buf = (char *)malloc(len);
178 if (buf == NULL)
179 error("copy_argv: malloc");
180
181 p = argv;
182 dst = buf;
183 while ((src = *p++) != NULL) {
184 while ((*dst++ = *src++) != '\0')
185 ;
186 dst[-1] = ' ';
187 }
188 dst[-1] = '\0';
189
190 return buf;
191 }
192
193 int
main(int argc,char ** argv)194 main(int argc, char **argv)
195 {
196 char *cp;
197 int op;
198 int dflag;
199 int gflag;
200 char *infile;
201 int Oflag;
202 long snaplen;
203 char *p;
204 int dlt;
205 int have_fcode = 0;
206 bpf_u_int32 netmask = PCAP_NETMASK_UNKNOWN;
207 char *cmdbuf;
208 pcap_t *pd;
209 struct bpf_program fcode;
210
211 #ifdef _WIN32
212 if (pcap_wsockinit() != 0)
213 return 1;
214 #endif /* _WIN32 */
215
216 dflag = 1;
217 gflag = 0;
218
219 infile = NULL;
220 Oflag = 1;
221 snaplen = 68;
222
223 if ((cp = strrchr(argv[0], '/')) != NULL)
224 program_name = cp + 1;
225 else
226 program_name = argv[0];
227
228 opterr = 0;
229 while ((op = getopt(argc, argv, "dF:gm:Os:")) != -1) {
230 switch (op) {
231
232 case 'd':
233 ++dflag;
234 break;
235
236 case 'g':
237 #ifdef BDEBUG
238 ++gflag;
239 #else
240 error("libpcap and filtertest not built with optimizer debugging enabled");
241 #endif
242 break;
243
244 case 'F':
245 infile = optarg;
246 break;
247
248 case 'O':
249 Oflag = 0;
250 break;
251
252 case 'm': {
253 bpf_u_int32 addr;
254
255 switch (inet_pton(AF_INET, optarg, &addr)) {
256
257 case 0:
258 error("invalid netmask %s", optarg);
259 break;
260
261 case -1:
262 error("invalid netmask %s: %s", optarg,
263 pcap_strerror(errno));
264 break;
265
266 case 1:
267 netmask = addr;
268 break;
269 }
270 break;
271 }
272
273 case 's': {
274 char *end;
275
276 snaplen = strtol(optarg, &end, 0);
277 if (optarg == end || *end != '\0'
278 || snaplen < 0 || snaplen > 65535)
279 error("invalid snaplen %s", optarg);
280 else if (snaplen == 0)
281 snaplen = 65535;
282 break;
283 }
284
285 default:
286 usage();
287 /* NOTREACHED */
288 }
289 }
290
291 if (optind >= argc) {
292 usage();
293 /* NOTREACHED */
294 }
295
296 dlt = pcap_datalink_name_to_val(argv[optind]);
297 if (dlt < 0) {
298 dlt = (int)strtol(argv[optind], &p, 10);
299 if (p == argv[optind] || *p != '\0')
300 error("invalid data link type %s", argv[optind]);
301 }
302
303 if (infile)
304 cmdbuf = read_infile(infile);
305 else
306 cmdbuf = copy_argv(&argv[optind+1]);
307
308 #ifdef BDEBUG
309 pcap_set_optimizer_debug(dflag);
310 pcap_set_print_dot_graph(gflag);
311 #endif
312
313 pd = pcap_open_dead(dlt, snaplen);
314 if (pd == NULL)
315 error("Can't open fake pcap_t");
316
317 if (pcap_compile(pd, &fcode, cmdbuf, Oflag, netmask) < 0)
318 error("%s", pcap_geterr(pd));
319
320 have_fcode = 1;
321 if (!bpf_validate(fcode.bf_insns, fcode.bf_len))
322 warn("Filter doesn't pass validation");
323
324 #ifdef BDEBUG
325 if (cmdbuf != NULL) {
326 // replace line feed with space
327 for (cp = cmdbuf; *cp != '\0'; ++cp) {
328 if (*cp == '\r' || *cp == '\n') {
329 *cp = ' ';
330 }
331 }
332 // only show machine code if BDEBUG defined, since dflag > 3
333 printf("machine codes for filter: %s\n", cmdbuf);
334 } else
335 printf("machine codes for empty filter:\n");
336 #endif
337
338 bpf_dump(&fcode, dflag);
339 free(cmdbuf);
340 if (have_fcode)
341 pcap_freecode (&fcode);
342 pcap_close(pd);
343 exit(0);
344 }
345
346 static void
usage(void)347 usage(void)
348 {
349 (void)fprintf(stderr, "%s, with %s\n", program_name,
350 pcap_lib_version());
351 (void)fprintf(stderr,
352 #ifdef BDEBUG
353 "Usage: %s [-dgO] [ -F file ] [ -m netmask] [ -s snaplen ] dlt [ expression ]\n",
354 #else
355 "Usage: %s [-dO] [ -F file ] [ -m netmask] [ -s snaplen ] dlt [ expression ]\n",
356 #endif
357 program_name);
358 exit(1);
359 }
360