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 /*
25 * This doesn't actually test libpcap itself; it tests whether
26 * valgrind properly handles the APIs libpcap uses. If it doesn't,
27 * we end up getting patches submitted to "fix" references that
28 * valgrind claims are being made to uninitialized data, when, in
29 * fact, the OS isn't making any such references - or we get
30 * valgrind *not* detecting *actual* incorrect references.
31 *
32 * Both BPF and Linux socket filters aren't handled correctly
33 * by some versions of valgrind. See valgrind bug 318203 for
34 * Linux:
35 *
36 * https://bugs.kde.org/show_bug.cgi?id=318203
37 *
38 * and valgrind bug 312989 for macOS:
39 *
40 * https://bugs.kde.org/show_bug.cgi?id=312989
41 *
42 * The fixes for both of those are checked into the official valgrind
43 * repository.
44 *
45 * The unofficial FreeBSD port has similar issues to the official macOS
46 * port, for similar reasons.
47 */
48 #ifndef lint
49 static const char copyright[] _U_ =
50 "@(#) Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000\n\
51 The Regents of the University of California. All rights reserved.\n";
52 #endif
53
54 #ifdef HAVE_CONFIG_H
55 #include <config.h>
56 #endif
57
58 #include <stdio.h>
59 #include <stdlib.h>
60 #include <string.h>
61 #include <stdarg.h>
62 #include <unistd.h>
63 #include <fcntl.h>
64 #include <errno.h>
65 #include <arpa/inet.h>
66 #include <sys/types.h>
67 #include <sys/stat.h>
68
69 #include "pcap/funcattrs.h"
70
71 #if defined(__APPLE__) || defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__DragonFly__) || defined(_AIX) || defined(sun)
72 /* OS with BPF - use BPF */
73 #define USE_BPF
74 #elif defined(linux)
75 /* Linux - use socket filters */
76 #define USE_SOCKET_FILTERS
77 #else
78 #error "Unknown platform or platform that doesn't support Valgrind"
79 #endif
80
81 #if defined(USE_BPF)
82
83 #include <sys/ioctl.h>
84 #include <net/bpf.h>
85
86 /*
87 * Make "pcap.h" not include "pcap/bpf.h"; we are going to include the
88 * native OS version, as we're going to be doing our own ioctls to
89 * make sure that, in the uninitialized-data tests, the filters aren't
90 * checked by libpcap before being handed to BPF.
91 */
92 #define PCAP_DONT_INCLUDE_PCAP_BPF_H
93
94 #elif defined(USE_SOCKET_FILTERS)
95
96 #include <sys/socket.h>
97 #include <linux/types.h>
98 #include <linux/filter.h>
99
100 #endif
101
102 #include <pcap.h>
103
104 static char *program_name;
105
106 /* Forwards */
107 static void PCAP_NORETURN usage(void);
108 static void PCAP_NORETURN error(const char *, ...) PCAP_PRINTFLIKE(1, 2);
109 static void warning(const char *, ...) PCAP_PRINTFLIKE(1, 2);
110
111 /*
112 * On Windows, we need to open the file in binary mode, so that
113 * we get all the bytes specified by the size we get from "fstat()".
114 * On UNIX, that's not necessary. O_BINARY is defined on Windows;
115 * we define it as 0 if it's not defined, so it does nothing.
116 */
117 #ifndef O_BINARY
118 #define O_BINARY 0
119 #endif
120
121 static char *
read_infile(char * fname)122 read_infile(char *fname)
123 {
124 register int i, fd, cc;
125 register char *cp;
126 struct stat buf;
127
128 fd = open(fname, O_RDONLY|O_BINARY);
129 if (fd < 0)
130 error("can't open %s: %s", fname, pcap_strerror(errno));
131
132 if (fstat(fd, &buf) < 0)
133 error("can't stat %s: %s", fname, pcap_strerror(errno));
134
135 cp = malloc((u_int)buf.st_size + 1);
136 if (cp == NULL)
137 error("malloc(%d) for %s: %s", (u_int)buf.st_size + 1,
138 fname, pcap_strerror(errno));
139 cc = read(fd, cp, (u_int)buf.st_size);
140 if (cc < 0)
141 error("read %s: %s", fname, pcap_strerror(errno));
142 if (cc != buf.st_size)
143 error("short read %s (%d != %d)", fname, cc, (int)buf.st_size);
144
145 close(fd);
146 /* replace "# comment" with spaces */
147 for (i = 0; i < cc; i++) {
148 if (cp[i] == '#')
149 while (i < cc && cp[i] != '\n')
150 cp[i++] = ' ';
151 }
152 cp[cc] = '\0';
153 return (cp);
154 }
155
156 /* VARARGS */
157 static void
error(const char * fmt,...)158 error(const char *fmt, ...)
159 {
160 va_list ap;
161
162 (void)fprintf(stderr, "%s: ", program_name);
163 va_start(ap, fmt);
164 (void)vfprintf(stderr, fmt, ap);
165 va_end(ap);
166 if (*fmt) {
167 fmt += strlen(fmt);
168 if (fmt[-1] != '\n')
169 (void)fputc('\n', stderr);
170 }
171 exit(1);
172 /* NOTREACHED */
173 }
174
175 /* VARARGS */
176 static void
warning(const char * fmt,...)177 warning(const char *fmt, ...)
178 {
179 va_list ap;
180
181 (void)fprintf(stderr, "%s: WARNING: ", program_name);
182 va_start(ap, fmt);
183 (void)vfprintf(stderr, fmt, ap);
184 va_end(ap);
185 if (*fmt) {
186 fmt += strlen(fmt);
187 if (fmt[-1] != '\n')
188 (void)fputc('\n', stderr);
189 }
190 }
191
192 /*
193 * Copy arg vector into a new buffer, concatenating arguments with spaces.
194 */
195 static char *
copy_argv(register char ** argv)196 copy_argv(register char **argv)
197 {
198 register char **p;
199 register u_int len = 0;
200 char *buf;
201 char *src, *dst;
202
203 p = argv;
204 if (*p == 0)
205 return 0;
206
207 while (*p)
208 len += strlen(*p++) + 1;
209
210 buf = (char *)malloc(len);
211 if (buf == NULL)
212 error("copy_argv: malloc");
213
214 p = argv;
215 dst = buf;
216 while ((src = *p++) != NULL) {
217 while ((*dst++ = *src++) != '\0')
218 ;
219 dst[-1] = ' ';
220 }
221 dst[-1] = '\0';
222
223 return buf;
224 }
225
226 #define INSN_COUNT 17
227
228 int
main(int argc,char ** argv)229 main(int argc, char **argv)
230 {
231 char *cp, *device;
232 int op;
233 int dorfmon, useactivate;
234 char ebuf[PCAP_ERRBUF_SIZE];
235 char *infile;
236 const char *cmdbuf;
237 pcap_if_t *devlist;
238 pcap_t *pd;
239 int status = 0;
240 int pcap_fd;
241 #if defined(USE_BPF)
242 struct bpf_program bad_fcode;
243 struct bpf_insn uninitialized[INSN_COUNT];
244 #elif defined(USE_SOCKET_FILTERS)
245 struct sock_fprog bad_fcode;
246 struct sock_filter uninitialized[INSN_COUNT];
247 #endif
248 struct bpf_program fcode;
249
250 device = NULL;
251 dorfmon = 0;
252 useactivate = 0;
253 infile = NULL;
254
255 if ((cp = strrchr(argv[0], '/')) != NULL)
256 program_name = cp + 1;
257 else
258 program_name = argv[0];
259
260 opterr = 0;
261 while ((op = getopt(argc, argv, "aF:i:I")) != -1) {
262 switch (op) {
263
264 case 'a':
265 useactivate = 1;
266 break;
267
268 case 'F':
269 infile = optarg;
270 break;
271
272 case 'i':
273 device = optarg;
274 break;
275
276 case 'I':
277 dorfmon = 1;
278 useactivate = 1; /* required for rfmon */
279 break;
280
281 default:
282 usage();
283 /* NOTREACHED */
284 }
285 }
286
287 if (device == NULL) {
288 /*
289 * No interface specified; get whatever pcap_lookupdev()
290 * finds.
291 */
292 if (pcap_findalldevs(&devlist, ebuf) == -1)
293 error("%s", ebuf);
294 if (devlist == NULL)
295 error("no interfaces available for capture");
296 device = strdup(devlist->name);
297 pcap_freealldevs(devlist);
298 }
299
300 if (infile != NULL) {
301 /*
302 * Filter specified with "-F" and a file containing
303 * a filter.
304 */
305 cmdbuf = read_infile(infile);
306 } else {
307 if (optind < argc) {
308 /*
309 * Filter specified with arguments on the
310 * command line.
311 */
312 cmdbuf = copy_argv(&argv[optind+1]);
313 } else {
314 /*
315 * No filter specified; use an empty string, which
316 * compiles to an "accept all" filter.
317 */
318 cmdbuf = "";
319 }
320 }
321
322 if (useactivate) {
323 pd = pcap_create(device, ebuf);
324 if (pd == NULL)
325 error("%s: pcap_create() failed: %s", device, ebuf);
326 status = pcap_set_snaplen(pd, 65535);
327 if (status != 0)
328 error("%s: pcap_set_snaplen failed: %s",
329 device, pcap_statustostr(status));
330 status = pcap_set_promisc(pd, 1);
331 if (status != 0)
332 error("%s: pcap_set_promisc failed: %s",
333 device, pcap_statustostr(status));
334 if (dorfmon) {
335 status = pcap_set_rfmon(pd, 1);
336 if (status != 0)
337 error("%s: pcap_set_rfmon failed: %s",
338 device, pcap_statustostr(status));
339 }
340 status = pcap_set_timeout(pd, 1000);
341 if (status != 0)
342 error("%s: pcap_set_timeout failed: %s",
343 device, pcap_statustostr(status));
344 status = pcap_activate(pd);
345 if (status < 0) {
346 /*
347 * pcap_activate() failed.
348 */
349 error("%s: %s\n(%s)", device,
350 pcap_statustostr(status), pcap_geterr(pd));
351 } else if (status > 0) {
352 /*
353 * pcap_activate() succeeded, but it's warning us
354 * of a problem it had.
355 */
356 warning("%s: %s\n(%s)", device,
357 pcap_statustostr(status), pcap_geterr(pd));
358 }
359 } else {
360 *ebuf = '\0';
361 pd = pcap_open_live(device, 65535, 1, 1000, ebuf);
362 if (pd == NULL)
363 error("%s", ebuf);
364 else if (*ebuf)
365 warning("%s", ebuf);
366 }
367
368 pcap_fd = pcap_fileno(pd);
369
370 /*
371 * Try setting a filter with an uninitialized bpf_program
372 * structure. This should cause valgrind to report a
373 * problem.
374 *
375 * We don't check for errors, because it could get an
376 * error due to a bad pointer or count.
377 */
378 #if defined(USE_BPF)
379 ioctl(pcap_fd, BIOCSETF, &bad_fcode);
380 #elif defined(USE_SOCKET_FILTERS)
381 setsockopt(pcap_fd, SOL_SOCKET, SO_ATTACH_FILTER, &bad_fcode,
382 sizeof(bad_fcode));
383 #endif
384
385 /*
386 * Try setting a filter with an initialized bpf_program
387 * structure that points to an uninitialized program.
388 * That should also cause valgrind to report a problem.
389 *
390 * We don't check for errors, because it could get an
391 * error due to a bad pointer or count.
392 */
393 #if defined(USE_BPF)
394 bad_fcode.bf_len = INSN_COUNT;
395 bad_fcode.bf_insns = uninitialized;
396 ioctl(pcap_fd, BIOCSETF, &bad_fcode);
397 #elif defined(USE_SOCKET_FILTERS)
398 bad_fcode.len = INSN_COUNT;
399 bad_fcode.filter = uninitialized;
400 setsockopt(pcap_fd, SOL_SOCKET, SO_ATTACH_FILTER, &bad_fcode,
401 sizeof(bad_fcode));
402 #endif
403
404 /*
405 * Now compile a filter and set the filter with that.
406 * That should *not* cause valgrind to report a
407 * problem.
408 */
409 if (pcap_compile(pd, &fcode, cmdbuf, 1, 0) < 0)
410 error("can't compile filter: %s", pcap_geterr(pd));
411 if (pcap_setfilter(pd, &fcode) < 0)
412 error("can't set filter: %s", pcap_geterr(pd));
413
414 pcap_close(pd);
415 exit(status < 0 ? 1 : 0);
416 }
417
418 static void
usage(void)419 usage(void)
420 {
421 (void)fprintf(stderr, "%s, with %s\n", program_name,
422 pcap_lib_version());
423 (void)fprintf(stderr,
424 "Usage: %s [-aI] [ -F file ] [ -I interface ] [ expression ]\n",
425 program_name);
426 exit(1);
427 }
428