1 /* $NetBSD: pcap.c,v 1.12 2024/09/02 15:33:37 christos Exp $ */
2
3 /*
4 * Copyright (c) 1993, 1994, 1995, 1996, 1997, 1998
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. All advertising materials mentioning features or use of this software
16 * must display the following acknowledgement:
17 * This product includes software developed by the Computer Systems
18 * Engineering Group at Lawrence Berkeley Laboratory.
19 * 4. Neither the name of the University nor of the Laboratory may be used
20 * to endorse or promote products derived from this software without
21 * specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36 #include <sys/cdefs.h>
37 __RCSID("$NetBSD: pcap.c,v 1.12 2024/09/02 15:33:37 christos Exp $");
38
39 #include <config.h>
40
41 /* Get the same variety of strerror_r() as Autoconf/CMake has detected. */
42 #include "ftmacros.h"
43
44 #include <pcap-types.h>
45 #ifndef _WIN32
46 #include <sys/param.h>
47 #ifndef MSDOS
48 #include <sys/file.h>
49 #endif
50 #include <sys/ioctl.h>
51 #include <sys/socket.h>
52 #ifdef HAVE_SYS_SOCKIO_H
53 #include <sys/sockio.h>
54 #endif
55
56 struct mbuf; /* Squelch compiler warnings on some platforms for */
57 struct rtentry; /* declarations in <net/if.h> */
58 #include <net/if.h>
59 #include <netinet/in.h>
60 #endif /* _WIN32 */
61
62 #include <stdio.h>
63 #include <stdlib.h>
64 #include <string.h>
65 #if !defined(_MSC_VER) && !defined(__BORLANDC__) && !defined(__MINGW32__)
66 #include <unistd.h>
67 #endif
68 #include <fcntl.h>
69 #include <errno.h>
70 #include <limits.h>
71
72 #include "diag-control.h"
73
74 #include "thread-local.h"
75
76 #ifdef HAVE_OS_PROTO_H
77 #include "os-proto.h"
78 #endif
79
80 #ifdef MSDOS
81 #include "pcap-dos.h"
82 #endif
83
84 #include "pcap-int.h"
85
86 #include "optimize.h"
87
88 #ifdef HAVE_DAG_API
89 #include "pcap-dag.h"
90 #endif /* HAVE_DAG_API */
91
92 #ifdef HAVE_SEPTEL_API
93 #include "pcap-septel.h"
94 #endif /* HAVE_SEPTEL_API */
95
96 #ifdef HAVE_SNF_API
97 #include "pcap-snf.h"
98 #endif /* HAVE_SNF_API */
99
100 #ifdef HAVE_TC_API
101 #include "pcap-tc.h"
102 #endif /* HAVE_TC_API */
103
104 #ifdef PCAP_SUPPORT_LINUX_USBMON
105 #include "pcap-usb-linux.h"
106 #endif
107
108 #ifdef PCAP_SUPPORT_BT
109 #include "pcap-bt-linux.h"
110 #endif
111
112 #ifdef PCAP_SUPPORT_BT_MONITOR
113 #include "pcap-bt-monitor-linux.h"
114 #endif
115
116 #ifdef PCAP_SUPPORT_NETFILTER
117 #include "pcap-netfilter-linux.h"
118 #endif
119
120 #ifdef PCAP_SUPPORT_NETMAP
121 #include "pcap-netmap.h"
122 #endif
123
124 #ifdef PCAP_SUPPORT_DBUS
125 #include "pcap-dbus.h"
126 #endif
127
128 #ifdef PCAP_SUPPORT_RPCAP
129 #include "pcap-rpcap-unix.h"
130 #endif
131
132 #ifdef PCAP_SUPPORT_RDMASNIFF
133 #include "pcap-rdmasniff.h"
134 #endif
135
136 #ifdef PCAP_SUPPORT_DPDK
137 #include "pcap-dpdk.h"
138 #endif
139
140 #ifdef HAVE_AIRPCAP_API
141 #include "pcap-airpcap.h"
142 #endif
143
144 #ifdef _WIN32
145 /*
146 * To quote the WSAStartup() documentation:
147 *
148 * The WSAStartup function typically leads to protocol-specific helper
149 * DLLs being loaded. As a result, the WSAStartup function should not
150 * be called from the DllMain function in a application DLL. This can
151 * potentially cause deadlocks.
152 *
153 * and the WSACleanup() documentation:
154 *
155 * The WSACleanup function typically leads to protocol-specific helper
156 * DLLs being unloaded. As a result, the WSACleanup function should not
157 * be called from the DllMain function in a application DLL. This can
158 * potentially cause deadlocks.
159 *
160 * So we don't initialize Winsock in a DllMain() routine.
161 *
162 * pcap_init() should be called to initialize pcap on both UN*X and
163 * Windows; it will initialize Winsock on Windows. (It will also be
164 * initialized as needed if pcap_init() hasn't been called.)
165 */
166
167 /*
168 * Shut down Winsock.
169 *
170 * Ignores the return value of WSACleanup(); given that this is
171 * an atexit() routine, there's nothing much we can do about
172 * a failure.
173 */
174 static void
internal_wsockfini(void)175 internal_wsockfini(void)
176 {
177 WSACleanup();
178 }
179
180 /*
181 * Start Winsock.
182 * Internal routine.
183 */
184 static int
internal_wsockinit(char * errbuf)185 internal_wsockinit(char *errbuf)
186 {
187 WORD wVersionRequested;
188 WSADATA wsaData;
189 static int err = -1;
190 static int done = 0;
191 int status;
192
193 if (done)
194 return (err);
195
196 /*
197 * Versions of Windows that don't support Winsock 2.2 are
198 * too old for us.
199 */
200 wVersionRequested = MAKEWORD(2, 2);
201 status = WSAStartup(wVersionRequested, &wsaData);
202 done = 1;
203 if (status != 0) {
204 if (errbuf != NULL) {
205 pcapint_fmt_errmsg_for_win32_err(errbuf, PCAP_ERRBUF_SIZE,
206 status, "WSAStartup() failed");
207 }
208 return (err);
209 }
210 atexit(internal_wsockfini);
211 err = 0;
212 return (err);
213 }
214
215 /*
216 * Exported in case some applications using WinPcap/Npcap called it,
217 * even though it wasn't exported.
218 */
219 int
wsockinit(void)220 wsockinit(void)
221 {
222 return (internal_wsockinit(NULL));
223 }
224
225 /*
226 * This is the exported function; new programs should call this.
227 * *Newer* programs should call pcap_init().
228 */
229 int
pcap_wsockinit(void)230 pcap_wsockinit(void)
231 {
232 return (internal_wsockinit(NULL));
233 }
234 #endif /* _WIN32 */
235
236 /*
237 * Do whatever initialization is needed for libpcap.
238 *
239 * The argument specifies whether we use the local code page or UTF-8
240 * for strings; on UN*X, we just assume UTF-8 in places where the encoding
241 * would matter, whereas, on Windows, we use the local code page for
242 * PCAP_CHAR_ENC_LOCAL and UTF-8 for PCAP_CHAR_ENC_UTF_8.
243 *
244 * On Windows, we also disable the hack in pcap_create() to deal with
245 * being handed UTF-16 strings, because if the user calls this they're
246 * explicitly declaring that they will either be passing local code
247 * page strings or UTF-8 strings, so we don't need to allow UTF-16LE
248 * strings to be passed. For good measure, on Windows *and* UN*X,
249 * we disable pcap_lookupdev(), to prevent anybody from even
250 * *trying* to pass the result of pcap_lookupdev() - which might be
251 * UTF-16LE on Windows, for ugly compatibility reasons - to pcap_create()
252 * or pcap_open_live() or pcap_open().
253 *
254 * Returns 0 on success, -1 on error.
255 */
256 int pcapint_new_api; /* pcap_lookupdev() always fails */
257 int pcapint_utf_8_mode; /* Strings should be in UTF-8. */
258
259 int
pcap_init(unsigned int opts,char * errbuf)260 pcap_init(unsigned int opts, char *errbuf)
261 {
262 static int initialized;
263
264 /*
265 * Don't allow multiple calls that set different modes; that
266 * may mean a library is initializing pcap in one mode and
267 * a program using that library, or another library used by
268 * that program, is initializing it in another mode.
269 */
270 switch (opts) {
271
272 case PCAP_CHAR_ENC_LOCAL:
273 /* Leave "UTF-8 mode" off. */
274 if (initialized) {
275 if (pcapint_utf_8_mode) {
276 snprintf(errbuf, PCAP_ERRBUF_SIZE,
277 "Multiple pcap_init calls with different character encodings");
278 return (PCAP_ERROR);
279 }
280 }
281 break;
282
283 case PCAP_CHAR_ENC_UTF_8:
284 /* Turn on "UTF-8 mode". */
285 if (initialized) {
286 if (!pcapint_utf_8_mode) {
287 snprintf(errbuf, PCAP_ERRBUF_SIZE,
288 "Multiple pcap_init calls with different character encodings");
289 return (PCAP_ERROR);
290 }
291 }
292 pcapint_utf_8_mode = 1;
293 break;
294
295 default:
296 snprintf(errbuf, PCAP_ERRBUF_SIZE, "Unknown options specified");
297 return (PCAP_ERROR);
298 }
299
300 /*
301 * Turn the appropriate mode on for error messages; those routines
302 * are also used in rpcapd, which has no access to pcap's internal
303 * UTF-8 mode flag, so we have to call a routine to set its
304 * UTF-8 mode flag.
305 */
306 pcapint_fmt_set_encoding(opts);
307
308 if (initialized) {
309 /*
310 * Nothing more to do; for example, on Windows, we've
311 * already initialized Winsock.
312 */
313 return (0);
314 }
315
316 #ifdef _WIN32
317 /*
318 * Now set up Winsock.
319 */
320 if (internal_wsockinit(errbuf) == -1) {
321 /* Failed. */
322 return (PCAP_ERROR);
323 }
324 #endif
325
326 /*
327 * We're done.
328 */
329 initialized = 1;
330 pcapint_new_api = 1;
331 return (0);
332 }
333
334 /*
335 * String containing the library version.
336 * Not explicitly exported via a header file - the right API to use
337 * is pcap_lib_version() - but some programs included it, so we
338 * provide it.
339 *
340 * We declare it here, right before defining it, to squelch any
341 * warnings we might get from compilers about the lack of a
342 * declaration.
343 */
344 PCAP_API char pcap_version[];
345 PCAP_API_DEF char pcap_version[] = PACKAGE_VERSION;
346
347 static void
pcap_set_not_initialized_message(pcap_t * pcap)348 pcap_set_not_initialized_message(pcap_t *pcap)
349 {
350 if (pcap->activated) {
351 /* A module probably forgot to set the function pointer */
352 (void)snprintf(pcap->errbuf, sizeof(pcap->errbuf),
353 "This operation isn't properly handled by that device");
354 return;
355 }
356 /* in case the caller doesn't check for PCAP_ERROR_NOT_ACTIVATED */
357 (void)snprintf(pcap->errbuf, sizeof(pcap->errbuf),
358 "This handle hasn't been activated yet");
359 }
360
361 static int
pcap_read_not_initialized(pcap_t * pcap,int cnt _U_,pcap_handler callback _U_,u_char * user _U_)362 pcap_read_not_initialized(pcap_t *pcap, int cnt _U_, pcap_handler callback _U_,
363 u_char *user _U_)
364 {
365 pcap_set_not_initialized_message(pcap);
366 /* this means 'not initialized' */
367 return (PCAP_ERROR_NOT_ACTIVATED);
368 }
369
370 static int
pcap_inject_not_initialized(pcap_t * pcap,const void * buf _U_,size_t size _U_)371 pcap_inject_not_initialized(pcap_t *pcap, const void * buf _U_, size_t size _U_)
372 {
373 pcap_set_not_initialized_message(pcap);
374 /* this means 'not initialized' */
375 return (PCAP_ERROR_NOT_ACTIVATED);
376 }
377
378 static int
pcap_setfilter_not_initialized(pcap_t * pcap,struct bpf_program * fp _U_)379 pcap_setfilter_not_initialized(pcap_t *pcap, struct bpf_program *fp _U_)
380 {
381 pcap_set_not_initialized_message(pcap);
382 /* this means 'not initialized' */
383 return (PCAP_ERROR_NOT_ACTIVATED);
384 }
385
386 static int
pcap_setdirection_not_initialized(pcap_t * pcap,pcap_direction_t d _U_)387 pcap_setdirection_not_initialized(pcap_t *pcap, pcap_direction_t d _U_)
388 {
389 pcap_set_not_initialized_message(pcap);
390 /* this means 'not initialized' */
391 return (PCAP_ERROR_NOT_ACTIVATED);
392 }
393
394 static int
pcap_set_datalink_not_initialized(pcap_t * pcap,int dlt _U_)395 pcap_set_datalink_not_initialized(pcap_t *pcap, int dlt _U_)
396 {
397 pcap_set_not_initialized_message(pcap);
398 /* this means 'not initialized' */
399 return (PCAP_ERROR_NOT_ACTIVATED);
400 }
401
402 static int
pcap_getnonblock_not_initialized(pcap_t * pcap)403 pcap_getnonblock_not_initialized(pcap_t *pcap)
404 {
405 pcap_set_not_initialized_message(pcap);
406 /* this means 'not initialized' */
407 return (PCAP_ERROR_NOT_ACTIVATED);
408 }
409
410 static int
pcap_stats_not_initialized(pcap_t * pcap,struct pcap_stat * ps _U_)411 pcap_stats_not_initialized(pcap_t *pcap, struct pcap_stat *ps _U_)
412 {
413 pcap_set_not_initialized_message(pcap);
414 /* this means 'not initialized' */
415 return (PCAP_ERROR_NOT_ACTIVATED);
416 }
417
418 #ifdef _WIN32
419 static struct pcap_stat *
pcap_stats_ex_not_initialized(pcap_t * pcap,int * pcap_stat_size _U_)420 pcap_stats_ex_not_initialized(pcap_t *pcap, int *pcap_stat_size _U_)
421 {
422 pcap_set_not_initialized_message(pcap);
423 return (NULL);
424 }
425
426 static int
pcap_setbuff_not_initialized(pcap_t * pcap,int dim _U_)427 pcap_setbuff_not_initialized(pcap_t *pcap, int dim _U_)
428 {
429 pcap_set_not_initialized_message(pcap);
430 /* this means 'not initialized' */
431 return (PCAP_ERROR_NOT_ACTIVATED);
432 }
433
434 static int
pcap_setmode_not_initialized(pcap_t * pcap,int mode _U_)435 pcap_setmode_not_initialized(pcap_t *pcap, int mode _U_)
436 {
437 pcap_set_not_initialized_message(pcap);
438 /* this means 'not initialized' */
439 return (PCAP_ERROR_NOT_ACTIVATED);
440 }
441
442 static int
pcap_setmintocopy_not_initialized(pcap_t * pcap,int size _U_)443 pcap_setmintocopy_not_initialized(pcap_t *pcap, int size _U_)
444 {
445 pcap_set_not_initialized_message(pcap);
446 /* this means 'not initialized' */
447 return (PCAP_ERROR_NOT_ACTIVATED);
448 }
449
450 static HANDLE
pcap_getevent_not_initialized(pcap_t * pcap)451 pcap_getevent_not_initialized(pcap_t *pcap)
452 {
453 pcap_set_not_initialized_message(pcap);
454 return (INVALID_HANDLE_VALUE);
455 }
456
457 static int
pcap_oid_get_request_not_initialized(pcap_t * pcap,bpf_u_int32 oid _U_,void * data _U_,size_t * lenp _U_)458 pcap_oid_get_request_not_initialized(pcap_t *pcap, bpf_u_int32 oid _U_,
459 void *data _U_, size_t *lenp _U_)
460 {
461 pcap_set_not_initialized_message(pcap);
462 return (PCAP_ERROR_NOT_ACTIVATED);
463 }
464
465 static int
pcap_oid_set_request_not_initialized(pcap_t * pcap,bpf_u_int32 oid _U_,const void * data _U_,size_t * lenp _U_)466 pcap_oid_set_request_not_initialized(pcap_t *pcap, bpf_u_int32 oid _U_,
467 const void *data _U_, size_t *lenp _U_)
468 {
469 pcap_set_not_initialized_message(pcap);
470 return (PCAP_ERROR_NOT_ACTIVATED);
471 }
472
473 static u_int
pcap_sendqueue_transmit_not_initialized(pcap_t * pcap,pcap_send_queue * queue _U_,int sync _U_)474 pcap_sendqueue_transmit_not_initialized(pcap_t *pcap, pcap_send_queue* queue _U_,
475 int sync _U_)
476 {
477 pcap_set_not_initialized_message(pcap);
478 return (0);
479 }
480
481 static int
pcap_setuserbuffer_not_initialized(pcap_t * pcap,int size _U_)482 pcap_setuserbuffer_not_initialized(pcap_t *pcap, int size _U_)
483 {
484 pcap_set_not_initialized_message(pcap);
485 return (PCAP_ERROR_NOT_ACTIVATED);
486 }
487
488 static int
pcap_live_dump_not_initialized(pcap_t * pcap,char * filename _U_,int maxsize _U_,int maxpacks _U_)489 pcap_live_dump_not_initialized(pcap_t *pcap, char *filename _U_, int maxsize _U_,
490 int maxpacks _U_)
491 {
492 pcap_set_not_initialized_message(pcap);
493 return (PCAP_ERROR_NOT_ACTIVATED);
494 }
495
496 static int
pcap_live_dump_ended_not_initialized(pcap_t * pcap,int sync _U_)497 pcap_live_dump_ended_not_initialized(pcap_t *pcap, int sync _U_)
498 {
499 pcap_set_not_initialized_message(pcap);
500 return (PCAP_ERROR_NOT_ACTIVATED);
501 }
502
503 static PAirpcapHandle
pcap_get_airpcap_handle_not_initialized(pcap_t * pcap)504 pcap_get_airpcap_handle_not_initialized(pcap_t *pcap)
505 {
506 pcap_set_not_initialized_message(pcap);
507 return (NULL);
508 }
509 #endif
510
511 /*
512 * Returns 1 if rfmon mode can be set on the pcap_t, 0 if it can't,
513 * a PCAP_ERROR value on an error.
514 */
515 int
pcap_can_set_rfmon(pcap_t * p)516 pcap_can_set_rfmon(pcap_t *p)
517 {
518 return (p->can_set_rfmon_op(p));
519 }
520
521 /*
522 * For systems where rfmon mode is never supported.
523 */
524 static int
pcap_cant_set_rfmon(pcap_t * p _U_)525 pcap_cant_set_rfmon(pcap_t *p _U_)
526 {
527 return (0);
528 }
529
530 /*
531 * Sets *tstamp_typesp to point to an array 1 or more supported time stamp
532 * types; the return value is the number of supported time stamp types.
533 * The list should be freed by a call to pcap_free_tstamp_types() when
534 * you're done with it.
535 *
536 * A return value of 0 means "you don't get a choice of time stamp type",
537 * in which case *tstamp_typesp is set to null.
538 *
539 * PCAP_ERROR is returned on error.
540 */
541 int
pcap_list_tstamp_types(pcap_t * p,int ** tstamp_typesp)542 pcap_list_tstamp_types(pcap_t *p, int **tstamp_typesp)
543 {
544 if (p->tstamp_type_count == 0) {
545 /*
546 * We don't support multiple time stamp types.
547 * That means the only type we support is PCAP_TSTAMP_HOST;
548 * set up a list containing only that type.
549 */
550 *tstamp_typesp = (int*)malloc(sizeof(**tstamp_typesp));
551 if (*tstamp_typesp == NULL) {
552 pcapint_fmt_errmsg_for_errno(p->errbuf, sizeof(p->errbuf),
553 errno, "malloc");
554 return (PCAP_ERROR);
555 }
556 **tstamp_typesp = PCAP_TSTAMP_HOST;
557 return (1);
558 } else {
559 *tstamp_typesp = (int*)calloc(p->tstamp_type_count,
560 sizeof(**tstamp_typesp));
561 if (*tstamp_typesp == NULL) {
562 pcapint_fmt_errmsg_for_errno(p->errbuf, sizeof(p->errbuf),
563 errno, "malloc");
564 return (PCAP_ERROR);
565 }
566 (void)memcpy(*tstamp_typesp, p->tstamp_type_list,
567 sizeof(**tstamp_typesp) * p->tstamp_type_count);
568 return (p->tstamp_type_count);
569 }
570 }
571
572 /*
573 * In Windows, you might have a library built with one version of the
574 * C runtime library and an application built with another version of
575 * the C runtime library, which means that the library might use one
576 * version of malloc() and free() and the application might use another
577 * version of malloc() and free(). If so, that means something
578 * allocated by the library cannot be freed by the application, so we
579 * need to have a pcap_free_tstamp_types() routine to free up the list
580 * allocated by pcap_list_tstamp_types(), even though it's just a wrapper
581 * around free().
582 */
583 void
pcap_free_tstamp_types(int * tstamp_type_list)584 pcap_free_tstamp_types(int *tstamp_type_list)
585 {
586 free(tstamp_type_list);
587 }
588
589 /*
590 * Default one-shot callback; overridden for capture types where the
591 * packet data cannot be guaranteed to be available after the callback
592 * returns, so that a copy must be made.
593 */
594 void
pcapint_oneshot(u_char * user,const struct pcap_pkthdr * h,const u_char * pkt)595 pcapint_oneshot(u_char *user, const struct pcap_pkthdr *h, const u_char *pkt)
596 {
597 struct oneshot_userdata *sp = (struct oneshot_userdata *)user;
598
599 *sp->hdr = *h;
600 *sp->pkt = pkt;
601 }
602
603 const u_char *
pcap_next(pcap_t * p,struct pcap_pkthdr * h)604 pcap_next(pcap_t *p, struct pcap_pkthdr *h)
605 {
606 struct oneshot_userdata s;
607 const u_char *pkt;
608
609 s.hdr = h;
610 s.pkt = &pkt;
611 s.pd = p;
612 if (pcap_dispatch(p, 1, p->oneshot_callback, (u_char *)&s) <= 0)
613 return (0);
614 return (pkt);
615 }
616
617 int
pcap_next_ex(pcap_t * p,struct pcap_pkthdr ** pkt_header,const u_char ** pkt_data)618 pcap_next_ex(pcap_t *p, struct pcap_pkthdr **pkt_header,
619 const u_char **pkt_data)
620 {
621 struct oneshot_userdata s;
622
623 s.hdr = &p->pcap_header;
624 s.pkt = pkt_data;
625 s.pd = p;
626
627 /* Saves a pointer to the packet headers */
628 *pkt_header= &p->pcap_header;
629
630 if (p->rfile != NULL) {
631 int status;
632
633 /* We are on an offline capture */
634 status = pcapint_offline_read(p, 1, p->oneshot_callback,
635 (u_char *)&s);
636
637 /*
638 * Return codes for pcapint_offline_read() are:
639 * - 0: EOF
640 * - -1: error
641 * - >0: OK - result is number of packets read, so
642 * it will be 1 in this case, as we've passed
643 * a maximum packet count of 1
644 * The first one ('0') conflicts with the return code of
645 * 0 from pcap_read() meaning "no packets arrived before
646 * the timeout expired", so we map it to -2 so you can
647 * distinguish between an EOF from a savefile and a
648 * "no packets arrived before the timeout expired, try
649 * again" from a live capture.
650 */
651 if (status == 0)
652 return (-2);
653 else
654 return (status);
655 }
656
657 /*
658 * Return codes for pcap_read() are:
659 * - 0: timeout
660 * - -1: error
661 * - -2: loop was broken out of with pcap_breakloop()
662 * - >0: OK, result is number of packets captured, so
663 * it will be 1 in this case, as we've passed
664 * a maximum packet count of 1
665 * The first one ('0') conflicts with the return code of 0 from
666 * pcapint_offline_read() meaning "end of file".
667 */
668 return (p->read_op(p, 1, p->oneshot_callback, (u_char *)&s));
669 }
670
671 /*
672 * Implementation of a pcap_if_list_t.
673 */
674 struct pcap_if_list {
675 pcap_if_t *beginning;
676 };
677
678 static struct capture_source_type {
679 int (*findalldevs_op)(pcap_if_list_t *, char *);
680 pcap_t *(*create_op)(const char *, char *, int *);
681 } capture_source_types[] = {
682 #ifdef HAVE_DAG_API
683 { dag_findalldevs, dag_create },
684 #endif
685 #ifdef HAVE_SEPTEL_API
686 { septel_findalldevs, septel_create },
687 #endif
688 #ifdef HAVE_SNF_API
689 { snf_findalldevs, snf_create },
690 #endif
691 #ifdef HAVE_TC_API
692 { TcFindAllDevs, TcCreate },
693 #endif
694 #ifdef PCAP_SUPPORT_BT
695 { bt_findalldevs, bt_create },
696 #endif
697 #ifdef PCAP_SUPPORT_BT_MONITOR
698 { bt_monitor_findalldevs, bt_monitor_create },
699 #endif
700 #ifdef PCAP_SUPPORT_LINUX_USBMON
701 { usb_findalldevs, usb_create },
702 #endif
703 #ifdef PCAP_SUPPORT_NETFILTER
704 { netfilter_findalldevs, netfilter_create },
705 #endif
706 #ifdef PCAP_SUPPORT_NETMAP
707 { pcap_netmap_findalldevs, pcap_netmap_create },
708 #endif
709 #ifdef PCAP_SUPPORT_DBUS
710 { dbus_findalldevs, dbus_create },
711 #endif
712 #ifdef PCAP_SUPPORT_RDMASNIFF
713 { rdmasniff_findalldevs, rdmasniff_create },
714 #endif
715 #ifdef PCAP_SUPPORT_DPDK
716 { pcap_dpdk_findalldevs, pcap_dpdk_create },
717 #endif
718 #ifdef HAVE_AIRPCAP_API
719 { airpcap_findalldevs, airpcap_create },
720 #endif
721 { NULL, NULL }
722 };
723
724 /*
725 * Get a list of all capture sources that are up and that we can open.
726 * Returns -1 on error, 0 otherwise.
727 * The list, as returned through "alldevsp", may be null if no interfaces
728 * were up and could be opened.
729 */
730 int
pcap_findalldevs(pcap_if_t ** alldevsp,char * errbuf)731 pcap_findalldevs(pcap_if_t **alldevsp, char *errbuf)
732 {
733 size_t i;
734 pcap_if_list_t devlist;
735
736 /*
737 * Find all the local network interfaces on which we
738 * can capture.
739 */
740 devlist.beginning = NULL;
741 if (pcapint_platform_finddevs(&devlist, errbuf) == -1) {
742 /*
743 * Failed - free all of the entries we were given
744 * before we failed.
745 */
746 if (devlist.beginning != NULL)
747 pcap_freealldevs(devlist.beginning);
748 *alldevsp = NULL;
749 return (-1);
750 }
751
752 /*
753 * Ask each of the non-local-network-interface capture
754 * source types what interfaces they have.
755 */
756 for (i = 0; capture_source_types[i].findalldevs_op != NULL; i++) {
757 if (capture_source_types[i].findalldevs_op(&devlist, errbuf) == -1) {
758 /*
759 * We had an error; free the list we've been
760 * constructing.
761 */
762 if (devlist.beginning != NULL)
763 pcap_freealldevs(devlist.beginning);
764 *alldevsp = NULL;
765 return (-1);
766 }
767 }
768
769 /*
770 * Return the first entry of the list of all devices.
771 */
772 *alldevsp = devlist.beginning;
773 return (0);
774 }
775
776 static struct sockaddr *
dup_sockaddr(struct sockaddr * sa,size_t sa_length)777 dup_sockaddr(struct sockaddr *sa, size_t sa_length)
778 {
779 struct sockaddr *newsa;
780
781 if ((newsa = malloc(sa_length)) == NULL)
782 return (NULL);
783 return (memcpy(newsa, sa, sa_length));
784 }
785
786 /*
787 * Construct a "figure of merit" for an interface, for use when sorting
788 * the list of interfaces, in which interfaces that are up are superior
789 * to interfaces that aren't up, interfaces that are up and running are
790 * superior to interfaces that are up but not running, and non-loopback
791 * interfaces that are up and running are superior to loopback interfaces,
792 * and interfaces with the same flags have a figure of merit that's higher
793 * the lower the instance number.
794 *
795 * The goal is to try to put the interfaces most likely to be useful for
796 * capture at the beginning of the list.
797 *
798 * The figure of merit, which is lower the "better" the interface is,
799 * has the uppermost bit set if the interface isn't running, the bit
800 * below that set if the interface isn't up, the bit below that
801 * set if the interface is a loopback interface, and the bit below
802 * that set if it's the "any" interface.
803 *
804 * Note: we don't sort by unit number because 1) not all interfaces have
805 * a unit number (systemd, for example, might assign interface names
806 * based on the interface's MAC address or on the physical location of
807 * the adapter's connector), and 2) if the name does end with a simple
808 * unit number, it's not a global property of the interface, it's only
809 * useful as a sort key for device names with the same prefix, so xyz0
810 * shouldn't necessarily sort before abc2. This means that interfaces
811 * with the same figure of merit will be sorted by the order in which
812 * the mechanism from which we're getting the interfaces supplies them.
813 */
814 static u_int
get_figure_of_merit(pcap_if_t * dev)815 get_figure_of_merit(pcap_if_t *dev)
816 {
817 u_int n;
818
819 n = 0;
820 if (!(dev->flags & PCAP_IF_RUNNING))
821 n |= 0x80000000;
822 if (!(dev->flags & PCAP_IF_UP))
823 n |= 0x40000000;
824
825 /*
826 * Give non-wireless interfaces that aren't disconnected a better
827 * figure of merit than interfaces that are disconnected, as
828 * "disconnected" should indicate that the interface isn't
829 * plugged into a network and thus won't give you any traffic.
830 *
831 * For wireless interfaces, it means "associated with a network",
832 * which we presume not to necessarily prevent capture, as you
833 * might run the adapter in some flavor of monitor mode.
834 */
835 if (!(dev->flags & PCAP_IF_WIRELESS) &&
836 (dev->flags & PCAP_IF_CONNECTION_STATUS) == PCAP_IF_CONNECTION_STATUS_DISCONNECTED)
837 n |= 0x20000000;
838
839 /*
840 * Sort loopback devices after non-loopback devices, *except* for
841 * disconnected devices.
842 */
843 if (dev->flags & PCAP_IF_LOOPBACK)
844 n |= 0x10000000;
845
846 /*
847 * Sort the "any" device before loopback and disconnected devices,
848 * but after all other devices.
849 */
850 if (strcmp(dev->name, "any") == 0)
851 n |= 0x08000000;
852
853 return (n);
854 }
855
856 #ifndef _WIN32
857 /*
858 * Try to get a description for a given device.
859 * Returns a malloced description if it could and NULL if it couldn't.
860 *
861 * XXX - on FreeBSDs that support it, should it get the sysctl named
862 * "dev.{adapter family name}.{adapter unit}.%desc" to get a description
863 * of the adapter? Note that "dev.an.0.%desc" is "Aironet PC4500/PC4800"
864 * with my Cisco 350 card, so the name isn't entirely descriptive. The
865 * "dev.an.0.%pnpinfo" has a better description, although one might argue
866 * that the problem is really a driver bug - if it can find out that it's
867 * a Cisco 340 or 350, rather than an old Aironet card, it should use
868 * that in the description.
869 *
870 * Do NetBSD, DragonflyBSD, or OpenBSD support this as well? FreeBSD
871 * and OpenBSD let you get a description, but it's not generated by the OS,
872 * it's set with another ioctl that ifconfig supports; we use that to get
873 * a description in FreeBSD and OpenBSD, but if there is no such
874 * description available, it still might be nice to get some description
875 * string based on the device type or something such as that.
876 *
877 * In macOS, the System Configuration framework can apparently return
878 * names in 10.4 and later.
879 *
880 * It also appears that freedesktop.org's HAL offers an "info.product"
881 * string, but the HAL specification says it "should not be used in any
882 * UI" and "subsystem/capability specific properties" should be used
883 * instead and, in any case, I think HAL is being deprecated in
884 * favor of other stuff such as DeviceKit. DeviceKit doesn't appear
885 * to have any obvious product information for devices, but maybe
886 * I haven't looked hard enough.
887 *
888 * Using the System Configuration framework, or HAL, or DeviceKit, or
889 * whatever, would require that libpcap applications be linked with
890 * the frameworks/libraries in question. That shouldn't be a problem
891 * for programs linking with the shared version of libpcap (unless
892 * you're running on AIX - which I think is the only UN*X that doesn't
893 * support linking a shared library with other libraries on which it
894 * depends, and having an executable linked only with the first shared
895 * library automatically pick up the other libraries when started -
896 * and using HAL or whatever). Programs linked with the static
897 * version of libpcap would have to use pcap-config with the --static
898 * flag in order to get the right linker flags in order to pick up
899 * the additional libraries/frameworks; those programs need that anyway
900 * for libpcap 1.1 and beyond on Linux, as, by default, it requires
901 * -lnl.
902 *
903 * Do any other UN*Xes, or desktop environments support getting a
904 * description?
905 */
906 static char *
907 #ifdef SIOCGIFDESCR
get_if_description(const char * name)908 get_if_description(const char *name)
909 {
910 char *description = NULL;
911 int s;
912 struct ifreq ifrdesc;
913 #ifndef IFDESCRSIZE
914 size_t descrlen = 64;
915 #else
916 size_t descrlen = IFDESCRSIZE;
917 #endif /* IFDESCRSIZE */
918
919 /*
920 * Get the description for the interface.
921 */
922 memset(&ifrdesc, 0, sizeof ifrdesc);
923 pcapint_strlcpy(ifrdesc.ifr_name, name, sizeof ifrdesc.ifr_name);
924 s = socket(AF_INET, SOCK_DGRAM, 0);
925 if (s >= 0) {
926 #ifdef __FreeBSD__
927 /*
928 * On FreeBSD, if the buffer isn't big enough for the
929 * description, the ioctl succeeds, but the description
930 * isn't copied, ifr_buffer.length is set to the description
931 * length, and ifr_buffer.buffer is set to NULL.
932 */
933 for (;;) {
934 free(description);
935 if ((description = malloc(descrlen)) != NULL) {
936 ifrdesc.ifr_buffer.buffer = description;
937 ifrdesc.ifr_buffer.length = descrlen;
938 if (ioctl(s, SIOCGIFDESCR, &ifrdesc) == 0) {
939 if (ifrdesc.ifr_buffer.buffer ==
940 description)
941 break;
942 else
943 descrlen = ifrdesc.ifr_buffer.length;
944 } else {
945 /*
946 * Failed to get interface description.
947 */
948 free(description);
949 description = NULL;
950 break;
951 }
952 } else
953 break;
954 }
955 #else /* __FreeBSD__ */
956 /*
957 * The only other OS that currently supports
958 * SIOCGIFDESCR is OpenBSD, and it has no way
959 * to get the description length - it's clamped
960 * to a maximum of IFDESCRSIZE.
961 */
962 if ((description = malloc(descrlen)) != NULL) {
963 ifrdesc.ifr_data = (caddr_t)description;
964 if (ioctl(s, SIOCGIFDESCR, &ifrdesc) != 0) {
965 /*
966 * Failed to get interface description.
967 */
968 free(description);
969 description = NULL;
970 }
971 }
972 #endif /* __FreeBSD__ */
973 close(s);
974 if (description != NULL && description[0] == '\0') {
975 /*
976 * Description is empty, so discard it.
977 */
978 free(description);
979 description = NULL;
980 }
981 }
982
983 #ifdef __FreeBSD__
984 /*
985 * For FreeBSD, if we didn't get a description, and this is
986 * a device with a name of the form usbusN, label it as a USB
987 * bus.
988 */
989 if (description == NULL) {
990 if (strncmp(name, "usbus", 5) == 0) {
991 /*
992 * OK, it begins with "usbus".
993 */
994 long busnum;
995 char *p;
996
997 errno = 0;
998 busnum = strtol(name + 5, &p, 10);
999 if (errno == 0 && p != name + 5 && *p == '\0' &&
1000 busnum >= 0 && busnum <= INT_MAX) {
1001 /*
1002 * OK, it's a valid number that's not
1003 * bigger than INT_MAX. Construct
1004 * a description from it.
1005 * (If that fails, we don't worry about
1006 * it, we just return NULL.)
1007 */
1008 if (pcapint_asprintf(&description,
1009 "USB bus number %ld", busnum) == -1) {
1010 /* Failed. */
1011 description = NULL;
1012 }
1013 }
1014 }
1015 }
1016 #endif
1017 return (description);
1018 #else /* SIOCGIFDESCR */
1019 get_if_description(const char *name _U_)
1020 {
1021 return (NULL);
1022 #endif /* SIOCGIFDESCR */
1023 }
1024
1025 /*
1026 * Look for a given device in the specified list of devices.
1027 *
1028 * If we find it, return a pointer to its entry.
1029 *
1030 * If we don't find it, attempt to add an entry for it, with the specified
1031 * IFF_ flags and description, and, if that succeeds, return a pointer to
1032 * the new entry, otherwise return NULL and set errbuf to an error message.
1033 */
1034 pcap_if_t *
1035 pcapint_find_or_add_if(pcap_if_list_t *devlistp, const char *name,
1036 uint64_t if_flags, get_if_flags_func get_flags_func, char *errbuf)
1037 {
1038 bpf_u_int32 pcap_flags;
1039
1040 /*
1041 * Convert IFF_ flags to pcap flags.
1042 */
1043 pcap_flags = 0;
1044 #ifdef IFF_LOOPBACK
1045 if (if_flags & IFF_LOOPBACK)
1046 pcap_flags |= PCAP_IF_LOOPBACK;
1047 #else
1048 /*
1049 * We don't have IFF_LOOPBACK, so look at the device name to
1050 * see if it looks like a loopback device.
1051 */
1052 if (name[0] == 'l' && name[1] == 'o' &&
1053 (PCAP_ISDIGIT(name[2]) || name[2] == '\0'))
1054 pcap_flags |= PCAP_IF_LOOPBACK;
1055 #endif
1056 #ifdef IFF_UP
1057 if (if_flags & IFF_UP)
1058 pcap_flags |= PCAP_IF_UP;
1059 #endif
1060 #ifdef IFF_RUNNING
1061 if (if_flags & IFF_RUNNING)
1062 pcap_flags |= PCAP_IF_RUNNING;
1063 #endif
1064
1065 /*
1066 * Attempt to find an entry for this device; if we don't find one,
1067 * attempt to add one.
1068 */
1069 return (pcapint_find_or_add_dev(devlistp, name, pcap_flags,
1070 get_flags_func, get_if_description(name), errbuf));
1071 }
1072
1073 /*
1074 * Look for a given device in the specified list of devices.
1075 *
1076 * If we find it, then, if the specified address isn't null, add it to
1077 * the list of addresses for the device and return 0.
1078 *
1079 * If we don't find it, attempt to add an entry for it, with the specified
1080 * IFF_ flags and description, and, if that succeeds, add the specified
1081 * address to its list of addresses if that address is non-null, and
1082 * return 0, otherwise return -1 and set errbuf to an error message.
1083 *
1084 * (We can get called with a null address because we might get a list
1085 * of interface name/address combinations from the underlying OS, with
1086 * the address being absent in some cases, rather than a list of
1087 * interfaces with each interface having a list of addresses, so this
1088 * call may be the only call made to add to the list, and we want to
1089 * add interfaces even if they have no addresses.)
1090 */
1091 int
1092 pcapint_add_addr_to_if(pcap_if_list_t *devlistp, const char *name,
1093 uint64_t if_flags, get_if_flags_func get_flags_func,
1094 struct sockaddr *addr, size_t addr_size,
1095 struct sockaddr *netmask, size_t netmask_size,
1096 struct sockaddr *broadaddr, size_t broadaddr_size,
1097 struct sockaddr *dstaddr, size_t dstaddr_size,
1098 char *errbuf)
1099 {
1100 pcap_if_t *curdev;
1101
1102 /*
1103 * Check whether the device exists and, if not, add it.
1104 */
1105 curdev = pcapint_find_or_add_if(devlistp, name, if_flags, get_flags_func,
1106 errbuf);
1107 if (curdev == NULL) {
1108 /*
1109 * Error - give up.
1110 */
1111 return (-1);
1112 }
1113
1114 if (addr == NULL) {
1115 /*
1116 * There's no address to add; this entry just meant
1117 * "here's a new interface".
1118 */
1119 return (0);
1120 }
1121
1122 /*
1123 * "curdev" is an entry for this interface, and we have an
1124 * address for it; add an entry for that address to the
1125 * interface's list of addresses.
1126 */
1127 return (pcapint_add_addr_to_dev(curdev, addr, addr_size, netmask,
1128 netmask_size, broadaddr, broadaddr_size, dstaddr,
1129 dstaddr_size, errbuf));
1130 }
1131 #endif /* _WIN32 */
1132
1133 /*
1134 * Add an entry to the list of addresses for an interface.
1135 * "curdev" is the entry for that interface.
1136 */
1137 int
1138 pcapint_add_addr_to_dev(pcap_if_t *curdev,
1139 struct sockaddr *addr, size_t addr_size,
1140 struct sockaddr *netmask, size_t netmask_size,
1141 struct sockaddr *broadaddr, size_t broadaddr_size,
1142 struct sockaddr *dstaddr, size_t dstaddr_size,
1143 char *errbuf)
1144 {
1145 pcap_addr_t *curaddr, *prevaddr, *nextaddr;
1146
1147 /*
1148 * Allocate the new entry and fill it in.
1149 */
1150 curaddr = (pcap_addr_t *)malloc(sizeof(pcap_addr_t));
1151 if (curaddr == NULL) {
1152 pcapint_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
1153 errno, "malloc");
1154 return (-1);
1155 }
1156
1157 curaddr->next = NULL;
1158 if (addr != NULL && addr_size != 0) {
1159 curaddr->addr = (struct sockaddr *)dup_sockaddr(addr, addr_size);
1160 if (curaddr->addr == NULL) {
1161 pcapint_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
1162 errno, "malloc");
1163 free(curaddr);
1164 return (-1);
1165 }
1166 } else
1167 curaddr->addr = NULL;
1168
1169 if (netmask != NULL && netmask_size != 0) {
1170 curaddr->netmask = (struct sockaddr *)dup_sockaddr(netmask, netmask_size);
1171 if (curaddr->netmask == NULL) {
1172 pcapint_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
1173 errno, "malloc");
1174 if (curaddr->addr != NULL)
1175 free(curaddr->addr);
1176 free(curaddr);
1177 return (-1);
1178 }
1179 } else
1180 curaddr->netmask = NULL;
1181
1182 if (broadaddr != NULL && broadaddr_size != 0) {
1183 curaddr->broadaddr = (struct sockaddr *)dup_sockaddr(broadaddr, broadaddr_size);
1184 if (curaddr->broadaddr == NULL) {
1185 pcapint_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
1186 errno, "malloc");
1187 if (curaddr->netmask != NULL)
1188 free(curaddr->netmask);
1189 if (curaddr->addr != NULL)
1190 free(curaddr->addr);
1191 free(curaddr);
1192 return (-1);
1193 }
1194 } else
1195 curaddr->broadaddr = NULL;
1196
1197 if (dstaddr != NULL && dstaddr_size != 0) {
1198 curaddr->dstaddr = (struct sockaddr *)dup_sockaddr(dstaddr, dstaddr_size);
1199 if (curaddr->dstaddr == NULL) {
1200 pcapint_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
1201 errno, "malloc");
1202 if (curaddr->broadaddr != NULL)
1203 free(curaddr->broadaddr);
1204 if (curaddr->netmask != NULL)
1205 free(curaddr->netmask);
1206 if (curaddr->addr != NULL)
1207 free(curaddr->addr);
1208 free(curaddr);
1209 return (-1);
1210 }
1211 } else
1212 curaddr->dstaddr = NULL;
1213
1214 /*
1215 * Find the end of the list of addresses.
1216 */
1217 for (prevaddr = curdev->addresses; prevaddr != NULL; prevaddr = nextaddr) {
1218 nextaddr = prevaddr->next;
1219 if (nextaddr == NULL) {
1220 /*
1221 * This is the end of the list.
1222 */
1223 break;
1224 }
1225 }
1226
1227 if (prevaddr == NULL) {
1228 /*
1229 * The list was empty; this is the first member.
1230 */
1231 curdev->addresses = curaddr;
1232 } else {
1233 /*
1234 * "prevaddr" is the last member of the list; append
1235 * this member to it.
1236 */
1237 prevaddr->next = curaddr;
1238 }
1239
1240 return (0);
1241 }
1242
1243 /*
1244 * Look for a given device in the specified list of devices.
1245 *
1246 * If we find it, return 0 and set *curdev_ret to point to it.
1247 *
1248 * If we don't find it, attempt to add an entry for it, with the specified
1249 * flags and description, and, if that succeeds, return 0, otherwise
1250 * return -1 and set errbuf to an error message.
1251 */
1252 pcap_if_t *
1253 pcapint_find_or_add_dev(pcap_if_list_t *devlistp, const char *name, bpf_u_int32 flags,
1254 get_if_flags_func get_flags_func, const char *description, char *errbuf)
1255 {
1256 pcap_if_t *curdev;
1257
1258 /*
1259 * Is there already an entry in the list for this device?
1260 */
1261 curdev = pcapint_find_dev(devlistp, name);
1262 if (curdev != NULL) {
1263 /*
1264 * Yes, return it.
1265 */
1266 return (curdev);
1267 }
1268
1269 /*
1270 * No, we didn't find it.
1271 */
1272
1273 /*
1274 * Try to get additional flags for the device.
1275 */
1276 if ((*get_flags_func)(name, &flags, errbuf) == -1) {
1277 /*
1278 * Failed.
1279 */
1280 return (NULL);
1281 }
1282
1283 /*
1284 * Now, try to add it to the list of devices.
1285 */
1286 return (pcapint_add_dev(devlistp, name, flags, description, errbuf));
1287 }
1288
1289 /*
1290 * Look for a given device in the specified list of devices, and return
1291 * the entry for it if we find it or NULL if we don't.
1292 */
1293 pcap_if_t *
1294 pcapint_find_dev(pcap_if_list_t *devlistp, const char *name)
1295 {
1296 pcap_if_t *curdev;
1297
1298 /*
1299 * Is there an entry in the list for this device?
1300 */
1301 for (curdev = devlistp->beginning; curdev != NULL;
1302 curdev = curdev->next) {
1303 if (strcmp(name, curdev->name) == 0) {
1304 /*
1305 * We found it, so, yes, there is. No need to
1306 * add it. Provide the entry we found to our
1307 * caller.
1308 */
1309 return (curdev);
1310 }
1311 }
1312
1313 /*
1314 * No.
1315 */
1316 return (NULL);
1317 }
1318
1319 /*
1320 * Attempt to add an entry for a device, with the specified flags
1321 * and description, and, if that succeeds, return 0 and return a pointer
1322 * to the new entry, otherwise return NULL and set errbuf to an error
1323 * message.
1324 *
1325 * If we weren't given a description, try to get one.
1326 */
1327 pcap_if_t *
1328 pcapint_add_dev(pcap_if_list_t *devlistp, const char *name, bpf_u_int32 flags,
1329 const char *description, char *errbuf)
1330 {
1331 pcap_if_t *curdev, *prevdev, *nextdev;
1332 u_int this_figure_of_merit, nextdev_figure_of_merit;
1333
1334 curdev = malloc(sizeof(pcap_if_t));
1335 if (curdev == NULL) {
1336 pcapint_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
1337 errno, "malloc");
1338 return (NULL);
1339 }
1340
1341 /*
1342 * Fill in the entry.
1343 */
1344 curdev->next = NULL;
1345 curdev->name = strdup(name);
1346 if (curdev->name == NULL) {
1347 pcapint_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
1348 errno, "malloc");
1349 free(curdev);
1350 return (NULL);
1351 }
1352 if (description == NULL) {
1353 /*
1354 * We weren't handed a description for the interface.
1355 */
1356 curdev->description = NULL;
1357 } else {
1358 /*
1359 * We were handed a description; make a copy.
1360 */
1361 curdev->description = strdup(description);
1362 if (curdev->description == NULL) {
1363 pcapint_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
1364 errno, "malloc");
1365 free(curdev->name);
1366 free(curdev);
1367 return (NULL);
1368 }
1369 }
1370 curdev->addresses = NULL; /* list starts out as empty */
1371 curdev->flags = flags;
1372
1373 /*
1374 * Add it to the list, in the appropriate location.
1375 * First, get the "figure of merit" for this interface.
1376 */
1377 this_figure_of_merit = get_figure_of_merit(curdev);
1378
1379 /*
1380 * Now look for the last interface with an figure of merit
1381 * less than or equal to the new interface's figure of merit.
1382 *
1383 * We start with "prevdev" being NULL, meaning we're before
1384 * the first element in the list.
1385 */
1386 prevdev = NULL;
1387 for (;;) {
1388 /*
1389 * Get the interface after this one.
1390 */
1391 if (prevdev == NULL) {
1392 /*
1393 * The next element is the first element.
1394 */
1395 nextdev = devlistp->beginning;
1396 } else
1397 nextdev = prevdev->next;
1398
1399 /*
1400 * Are we at the end of the list?
1401 */
1402 if (nextdev == NULL) {
1403 /*
1404 * Yes - we have to put the new entry after "prevdev".
1405 */
1406 break;
1407 }
1408
1409 /*
1410 * Is the new interface's figure of merit less
1411 * than the next interface's figure of merit,
1412 * meaning that the new interface is better
1413 * than the next interface?
1414 */
1415 nextdev_figure_of_merit = get_figure_of_merit(nextdev);
1416 if (this_figure_of_merit < nextdev_figure_of_merit) {
1417 /*
1418 * Yes - we should put the new entry
1419 * before "nextdev", i.e. after "prevdev".
1420 */
1421 break;
1422 }
1423
1424 prevdev = nextdev;
1425 }
1426
1427 /*
1428 * Insert before "nextdev".
1429 */
1430 curdev->next = nextdev;
1431
1432 /*
1433 * Insert after "prevdev" - unless "prevdev" is null,
1434 * in which case this is the first interface.
1435 */
1436 if (prevdev == NULL) {
1437 /*
1438 * This is the first interface. Make it
1439 * the first element in the list of devices.
1440 */
1441 devlistp->beginning = curdev;
1442 } else
1443 prevdev->next = curdev;
1444 return (curdev);
1445 }
1446
1447 /*
1448 * Add an entry for the "any" device.
1449 */
1450 pcap_if_t *
1451 pcap_add_any_dev(pcap_if_list_t *devlistp, char *errbuf)
1452 {
1453 static const char any_descr[] = "Pseudo-device that captures on all interfaces";
1454
1455 /*
1456 * As it refers to all network devices, not to any particular
1457 * network device, the notion of "connected" vs. "disconnected"
1458 * doesn't apply to the "any" device.
1459 */
1460 return pcapint_add_dev(devlistp, "any",
1461 PCAP_IF_UP|PCAP_IF_RUNNING|PCAP_IF_CONNECTION_STATUS_NOT_APPLICABLE,
1462 any_descr, errbuf);
1463 }
1464
1465 /*
1466 * Free a list of interfaces.
1467 */
1468 void
1469 pcap_freealldevs(pcap_if_t *alldevs)
1470 {
1471 pcap_if_t *curdev, *nextdev;
1472 pcap_addr_t *curaddr, *nextaddr;
1473
1474 for (curdev = alldevs; curdev != NULL; curdev = nextdev) {
1475 nextdev = curdev->next;
1476
1477 /*
1478 * Free all addresses.
1479 */
1480 for (curaddr = curdev->addresses; curaddr != NULL; curaddr = nextaddr) {
1481 nextaddr = curaddr->next;
1482 if (curaddr->addr)
1483 free(curaddr->addr);
1484 if (curaddr->netmask)
1485 free(curaddr->netmask);
1486 if (curaddr->broadaddr)
1487 free(curaddr->broadaddr);
1488 if (curaddr->dstaddr)
1489 free(curaddr->dstaddr);
1490 free(curaddr);
1491 }
1492
1493 /*
1494 * Free the name string.
1495 */
1496 free(curdev->name);
1497
1498 /*
1499 * Free the description string, if any.
1500 */
1501 if (curdev->description != NULL)
1502 free(curdev->description);
1503
1504 /*
1505 * Free the interface.
1506 */
1507 free(curdev);
1508 }
1509 }
1510
1511 /*
1512 * pcap-npf.c has its own pcap_lookupdev(), for compatibility reasons, as
1513 * it actually returns the names of all interfaces, with a NUL separator
1514 * between them; some callers may depend on that.
1515 *
1516 * MS-DOS has its own pcap_lookupdev(), but that might be useful only
1517 * as an optimization.
1518 *
1519 * In all other cases, we just use pcap_findalldevs() to get a list of
1520 * devices, and pick from that list.
1521 */
1522 #if !defined(HAVE_PACKET32) && !defined(MSDOS)
1523 /*
1524 * Return the name of a network interface attached to the system, or NULL
1525 * if none can be found. The interface must be configured up; the
1526 * lowest unit number is preferred; loopback is ignored.
1527 */
1528 char *
1529 pcap_lookupdev(char *errbuf)
1530 {
1531 pcap_if_t *alldevs;
1532 #ifdef _WIN32
1533 /*
1534 * Windows - use the same size as the old WinPcap 3.1 code.
1535 * XXX - this is probably bigger than it needs to be.
1536 */
1537 #define IF_NAMESIZE 8192
1538 #else
1539 /*
1540 * UN*X - use the system's interface name size.
1541 * XXX - that might not be large enough for capture devices
1542 * that aren't regular network interfaces.
1543 */
1544 /* for old BSD systems, including bsdi3 */
1545 #ifndef IF_NAMESIZE
1546 #define IF_NAMESIZE IFNAMSIZ
1547 #endif
1548 #endif
1549 static char device[IF_NAMESIZE + 1];
1550 char *ret;
1551
1552 /*
1553 * We disable this in "new API" mode, because 1) in WinPcap/Npcap,
1554 * it may return UTF-16 strings, for backwards-compatibility
1555 * reasons, and we're also disabling the hack to make that work,
1556 * for not-going-past-the-end-of-a-string reasons, and 2) we
1557 * want its behavior to be consistent.
1558 *
1559 * In addition, it's not thread-safe, so we've marked it as
1560 * deprecated.
1561 */
1562 if (pcapint_new_api) {
1563 snprintf(errbuf, PCAP_ERRBUF_SIZE,
1564 "pcap_lookupdev() is deprecated and is not supported in programs calling pcap_init()");
1565 return (NULL);
1566 }
1567
1568 if (pcap_findalldevs(&alldevs, errbuf) == -1)
1569 return (NULL);
1570
1571 if (alldevs == NULL || (alldevs->flags & PCAP_IF_LOOPBACK)) {
1572 /*
1573 * There are no devices on the list, or the first device
1574 * on the list is a loopback device, which means there
1575 * are no non-loopback devices on the list. This means
1576 * we can't return any device.
1577 *
1578 * XXX - why not return a loopback device? If we can't
1579 * capture on it, it won't be on the list, and if it's
1580 * on the list, there aren't any non-loopback devices,
1581 * so why not just supply it as the default device?
1582 */
1583 (void)pcapint_strlcpy(errbuf, "no suitable device found",
1584 PCAP_ERRBUF_SIZE);
1585 ret = NULL;
1586 } else {
1587 /*
1588 * Return the name of the first device on the list.
1589 */
1590 (void)pcapint_strlcpy(device, alldevs->name, sizeof(device));
1591 ret = device;
1592 }
1593
1594 pcap_freealldevs(alldevs);
1595 return (ret);
1596 }
1597 #endif /* !defined(HAVE_PACKET32) && !defined(MSDOS) */
1598
1599 #if !defined(_WIN32) && !defined(MSDOS)
1600 /*
1601 * We don't just fetch the entire list of devices, search for the
1602 * particular device, and use its first IPv4 address, as that's too
1603 * much work to get just one device's netmask.
1604 *
1605 * If we had an API to get attributes for a given device, we could
1606 * use that.
1607 */
1608 int
1609 pcap_lookupnet(const char *device, bpf_u_int32 *netp, bpf_u_int32 *maskp,
1610 char *errbuf)
1611 {
1612 register int fd;
1613 register struct sockaddr_in *sin4;
1614 struct ifreq ifr;
1615
1616 /*
1617 * The pseudo-device "any" listens on all interfaces and therefore
1618 * has the network address and -mask "0.0.0.0" therefore catching
1619 * all traffic. Using NULL for the interface is the same as "any".
1620 */
1621 if (!device || strcmp(device, "any") == 0
1622 #ifdef HAVE_DAG_API
1623 || strstr(device, "dag") != NULL
1624 #endif
1625 #ifdef HAVE_SEPTEL_API
1626 || strstr(device, "septel") != NULL
1627 #endif
1628 #ifdef PCAP_SUPPORT_BT
1629 || strstr(device, "bluetooth") != NULL
1630 #endif
1631 #ifdef PCAP_SUPPORT_LINUX_USBMON
1632 || strstr(device, "usbmon") != NULL
1633 #endif
1634 #ifdef HAVE_SNF_API
1635 || strstr(device, "snf") != NULL
1636 #endif
1637 #ifdef PCAP_SUPPORT_NETMAP
1638 || strncmp(device, "netmap:", 7) == 0
1639 || strncmp(device, "vale", 4) == 0
1640 #endif
1641 #ifdef PCAP_SUPPORT_DPDK
1642 || strncmp(device, "dpdk:", 5) == 0
1643 #endif
1644 ) {
1645 *netp = *maskp = 0;
1646 return 0;
1647 }
1648
1649 fd = socket(AF_INET, SOCK_DGRAM, 0);
1650 if (fd < 0) {
1651 pcapint_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
1652 errno, "socket");
1653 return (-1);
1654 }
1655 memset(&ifr, 0, sizeof(ifr));
1656 #ifdef __linux__
1657 /* XXX Work around Linux kernel bug */
1658 ifr.ifr_addr.sa_family = AF_INET;
1659 #endif
1660 (void)pcapint_strlcpy(ifr.ifr_name, device, sizeof(ifr.ifr_name));
1661 #if defined(__HAIKU__) && defined(__clang__)
1662 /*
1663 * In Haiku R1/beta4 <unistd.h> ioctl() is a macro that needs to take 4
1664 * arguments to initialize its intermediate 2-member structure fully so
1665 * that Clang does not generate a -Wmissing-field-initializers warning
1666 * (which manifests only when it runs with -Werror). This workaround
1667 * can be removed as soon as there is a Haiku release that fixes the
1668 * problem. See also https://review.haiku-os.org/c/haiku/+/6369
1669 */
1670 if (ioctl(fd, SIOCGIFADDR, (char *)&ifr, sizeof(ifr)) < 0) {
1671 #else
1672 if (ioctl(fd, SIOCGIFADDR, (char *)&ifr) < 0) {
1673 #endif /* __HAIKU__ && __clang__ */
1674 if (errno == EADDRNOTAVAIL) {
1675 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
1676 "%s: no IPv4 address assigned", device);
1677 } else {
1678 pcapint_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
1679 errno, "SIOCGIFADDR: %s", device);
1680 }
1681 (void)close(fd);
1682 return (-1);
1683 }
1684 sin4 = (struct sockaddr_in *)&ifr.ifr_addr;
1685 *netp = sin4->sin_addr.s_addr;
1686 memset(&ifr, 0, sizeof(ifr));
1687 #ifdef __linux__
1688 /* XXX Work around Linux kernel bug */
1689 ifr.ifr_addr.sa_family = AF_INET;
1690 #endif
1691 (void)pcapint_strlcpy(ifr.ifr_name, device, sizeof(ifr.ifr_name));
1692 #if defined(__HAIKU__) && defined(__clang__)
1693 /* Same as above. */
1694 if (ioctl(fd, SIOCGIFNETMASK, (char *)&ifr, sizeof(ifr)) < 0) {
1695 #else
1696 if (ioctl(fd, SIOCGIFNETMASK, (char *)&ifr) < 0) {
1697 #endif /* __HAIKU__ && __clang__ */
1698 pcapint_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
1699 errno, "SIOCGIFNETMASK: %s", device);
1700 (void)close(fd);
1701 return (-1);
1702 }
1703 (void)close(fd);
1704 *maskp = sin4->sin_addr.s_addr;
1705 if (*maskp == 0) {
1706 if (IN_CLASSA(*netp))
1707 *maskp = IN_CLASSA_NET;
1708 else if (IN_CLASSB(*netp))
1709 *maskp = IN_CLASSB_NET;
1710 else if (IN_CLASSC(*netp))
1711 *maskp = IN_CLASSC_NET;
1712 else {
1713 (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
1714 "inet class for 0x%x unknown", *netp);
1715 return (-1);
1716 }
1717 }
1718 *netp &= *maskp;
1719 return (0);
1720 }
1721 #endif /* !defined(_WIN32) && !defined(MSDOS) */
1722
1723 #ifdef ENABLE_REMOTE
1724 #include "pcap-rpcap.h"
1725
1726 /*
1727 * Extract a substring from a string.
1728 */
1729 static char *
1730 get_substring(const char *p, size_t len, char *ebuf)
1731 {
1732 char *token;
1733
1734 token = malloc(len + 1);
1735 if (token == NULL) {
1736 pcapint_fmt_errmsg_for_errno(ebuf, PCAP_ERRBUF_SIZE,
1737 errno, "malloc");
1738 return (NULL);
1739 }
1740 memcpy(token, p, len);
1741 token[len] = '\0';
1742 return (token);
1743 }
1744
1745 /*
1746 * Parse a capture source that might be a URL.
1747 *
1748 * If the source is not a URL, *schemep, *userinfop, *hostp, and *portp
1749 * are set to NULL, *pathp is set to point to the source, and 0 is
1750 * returned.
1751 *
1752 * If source is a URL, and the URL refers to a local device (a special
1753 * case of rpcap:), *schemep, *userinfop, *hostp, and *portp are set
1754 * to NULL, *pathp is set to point to the device name, and 0 is returned.
1755 *
1756 * If source is a URL, and it's not a special case that refers to a local
1757 * device, and the parse succeeds:
1758 *
1759 * *schemep is set to point to an allocated string containing the scheme;
1760 *
1761 * if user information is present in the URL, *userinfop is set to point
1762 * to an allocated string containing the user information, otherwise
1763 * it's set to NULL;
1764 *
1765 * if host information is present in the URL, *hostp is set to point
1766 * to an allocated string containing the host information, otherwise
1767 * it's set to NULL;
1768 *
1769 * if a port number is present in the URL, *portp is set to point
1770 * to an allocated string containing the port number, otherwise
1771 * it's set to NULL;
1772 *
1773 * *pathp is set to point to an allocated string containing the
1774 * path;
1775 *
1776 * and 0 is returned.
1777 *
1778 * If the parse fails, ebuf is set to an error string, and -1 is returned.
1779 */
1780 static int
1781 pcap_parse_source(const char *source, char **schemep, char **userinfop,
1782 char **hostp, char **portp, char **pathp, char *ebuf)
1783 {
1784 char *colonp;
1785 size_t scheme_len;
1786 char *scheme;
1787 const char *endp;
1788 size_t authority_len;
1789 char *authority;
1790 char *parsep, *atsignp, *bracketp;
1791 char *userinfo, *host, *port, *path;
1792
1793 /*
1794 * Start out returning nothing.
1795 */
1796 *schemep = NULL;
1797 *userinfop = NULL;
1798 *hostp = NULL;
1799 *portp = NULL;
1800 *pathp = NULL;
1801
1802 /*
1803 * RFC 3986 says:
1804 *
1805 * URI = scheme ":" hier-part [ "?" query ] [ "#" fragment ]
1806 *
1807 * hier-part = "//" authority path-abempty
1808 * / path-absolute
1809 * / path-rootless
1810 * / path-empty
1811 *
1812 * authority = [ userinfo "@" ] host [ ":" port ]
1813 *
1814 * userinfo = *( unreserved / pct-encoded / sub-delims / ":" )
1815 *
1816 * Step 1: look for the ":" at the end of the scheme.
1817 * A colon in the source is *NOT* sufficient to indicate that
1818 * this is a URL, as interface names on some platforms might
1819 * include colons (e.g., I think some Solaris interfaces
1820 * might).
1821 */
1822 colonp = strchr(source, ':');
1823 if (colonp == NULL) {
1824 /*
1825 * The source is the device to open.
1826 * Return a NULL pointer for the scheme, user information,
1827 * host, and port, and return the device as the path.
1828 */
1829 *pathp = strdup(source);
1830 if (*pathp == NULL) {
1831 pcapint_fmt_errmsg_for_errno(ebuf, PCAP_ERRBUF_SIZE,
1832 errno, "malloc");
1833 return (-1);
1834 }
1835 return (0);
1836 }
1837
1838 /*
1839 * All schemes must have "//" after them, i.e. we only support
1840 * hier-part = "//" authority path-abempty, not
1841 * hier-part = path-absolute
1842 * hier-part = path-rootless
1843 * hier-part = path-empty
1844 *
1845 * We need that in order to distinguish between a local device
1846 * name that happens to contain a colon and a URI.
1847 */
1848 if (strncmp(colonp + 1, "//", 2) != 0) {
1849 /*
1850 * The source is the device to open.
1851 * Return a NULL pointer for the scheme, user information,
1852 * host, and port, and return the device as the path.
1853 */
1854 *pathp = strdup(source);
1855 if (*pathp == NULL) {
1856 pcapint_fmt_errmsg_for_errno(ebuf, PCAP_ERRBUF_SIZE,
1857 errno, "malloc");
1858 return (-1);
1859 }
1860 return (0);
1861 }
1862
1863 /*
1864 * XXX - check whether the purported scheme could be a scheme?
1865 */
1866
1867 /*
1868 * OK, this looks like a URL.
1869 * Get the scheme.
1870 */
1871 scheme_len = colonp - source;
1872 scheme = malloc(scheme_len + 1);
1873 if (scheme == NULL) {
1874 pcapint_fmt_errmsg_for_errno(ebuf, PCAP_ERRBUF_SIZE,
1875 errno, "malloc");
1876 return (-1);
1877 }
1878 memcpy(scheme, source, scheme_len);
1879 scheme[scheme_len] = '\0';
1880
1881 /*
1882 * Treat file: specially - take everything after file:// as
1883 * the pathname.
1884 */
1885 if (pcapint_strcasecmp(scheme, "file") == 0) {
1886 *pathp = strdup(colonp + 3);
1887 if (*pathp == NULL) {
1888 pcapint_fmt_errmsg_for_errno(ebuf, PCAP_ERRBUF_SIZE,
1889 errno, "malloc");
1890 free(scheme);
1891 return (-1);
1892 }
1893 *schemep = scheme;
1894 return (0);
1895 }
1896
1897 /*
1898 * The WinPcap documentation says you can specify a local
1899 * interface with "rpcap://{device}"; we special-case
1900 * that here. If the scheme is "rpcap", and there are
1901 * no slashes past the "//", we just return the device.
1902 *
1903 * XXX - %-escaping?
1904 */
1905 if ((pcapint_strcasecmp(scheme, "rpcap") == 0 ||
1906 pcapint_strcasecmp(scheme, "rpcaps") == 0) &&
1907 strchr(colonp + 3, '/') == NULL) {
1908 /*
1909 * Local device.
1910 *
1911 * Return a NULL pointer for the scheme, user information,
1912 * host, and port, and return the device as the path.
1913 */
1914 free(scheme);
1915 *pathp = strdup(colonp + 3);
1916 if (*pathp == NULL) {
1917 pcapint_fmt_errmsg_for_errno(ebuf, PCAP_ERRBUF_SIZE,
1918 errno, "malloc");
1919 return (-1);
1920 }
1921 return (0);
1922 }
1923
1924 /*
1925 * OK, now start parsing the authority.
1926 * Get token, terminated with / or terminated at the end of
1927 * the string.
1928 */
1929 authority_len = strcspn(colonp + 3, "/");
1930 authority = get_substring(colonp + 3, authority_len, ebuf);
1931 if (authority == NULL) {
1932 /*
1933 * Error.
1934 */
1935 free(scheme);
1936 return (-1);
1937 }
1938 endp = colonp + 3 + authority_len;
1939
1940 /*
1941 * Now carve the authority field into its components.
1942 */
1943 parsep = authority;
1944
1945 /*
1946 * Is there a userinfo field?
1947 */
1948 atsignp = strchr(parsep, '@');
1949 if (atsignp != NULL) {
1950 /*
1951 * Yes.
1952 */
1953 size_t userinfo_len;
1954
1955 userinfo_len = atsignp - parsep;
1956 userinfo = get_substring(parsep, userinfo_len, ebuf);
1957 if (userinfo == NULL) {
1958 /*
1959 * Error.
1960 */
1961 free(authority);
1962 free(scheme);
1963 return (-1);
1964 }
1965 parsep = atsignp + 1;
1966 } else {
1967 /*
1968 * No.
1969 */
1970 userinfo = NULL;
1971 }
1972
1973 /*
1974 * Is there a host field?
1975 */
1976 if (*parsep == '\0') {
1977 /*
1978 * No; there's no host field or port field.
1979 */
1980 host = NULL;
1981 port = NULL;
1982 } else {
1983 /*
1984 * Yes.
1985 */
1986 size_t host_len;
1987
1988 /*
1989 * Is it an IP-literal?
1990 */
1991 if (*parsep == '[') {
1992 /*
1993 * Yes.
1994 * Treat everything up to the closing square
1995 * bracket as the IP-Literal; we don't worry
1996 * about whether it's a valid IPv6address or
1997 * IPvFuture (or an IPv4address, for that
1998 * matter, just in case we get handed a
1999 * URL with an IPv4 IP-Literal, of the sort
2000 * that pcap_createsrcstr() used to generate,
2001 * and that pcap_parsesrcstr(), in the original
2002 * WinPcap code, accepted).
2003 */
2004 bracketp = strchr(parsep, ']');
2005 if (bracketp == NULL) {
2006 /*
2007 * There's no closing square bracket.
2008 */
2009 snprintf(ebuf, PCAP_ERRBUF_SIZE,
2010 "IP-literal in URL doesn't end with ]");
2011 free(userinfo);
2012 free(authority);
2013 free(scheme);
2014 return (-1);
2015 }
2016 if (*(bracketp + 1) != '\0' &&
2017 *(bracketp + 1) != ':') {
2018 /*
2019 * There's extra crud after the
2020 * closing square bracket.
2021 */
2022 snprintf(ebuf, PCAP_ERRBUF_SIZE,
2023 "Extra text after IP-literal in URL");
2024 free(userinfo);
2025 free(authority);
2026 free(scheme);
2027 return (-1);
2028 }
2029 host_len = (bracketp - 1) - parsep;
2030 host = get_substring(parsep + 1, host_len, ebuf);
2031 if (host == NULL) {
2032 /*
2033 * Error.
2034 */
2035 free(userinfo);
2036 free(authority);
2037 free(scheme);
2038 return (-1);
2039 }
2040 parsep = bracketp + 1;
2041 } else {
2042 /*
2043 * No.
2044 * Treat everything up to a : or the end of
2045 * the string as the host.
2046 */
2047 host_len = strcspn(parsep, ":");
2048 host = get_substring(parsep, host_len, ebuf);
2049 if (host == NULL) {
2050 /*
2051 * Error.
2052 */
2053 free(userinfo);
2054 free(authority);
2055 free(scheme);
2056 return (-1);
2057 }
2058 parsep = parsep + host_len;
2059 }
2060
2061 /*
2062 * Is there a port field?
2063 */
2064 if (*parsep == ':') {
2065 /*
2066 * Yes. It's the rest of the authority field.
2067 */
2068 size_t port_len;
2069
2070 parsep++;
2071 port_len = strlen(parsep);
2072 port = get_substring(parsep, port_len, ebuf);
2073 if (port == NULL) {
2074 /*
2075 * Error.
2076 */
2077 free(host);
2078 free(userinfo);
2079 free(authority);
2080 free(scheme);
2081 return (-1);
2082 }
2083 } else {
2084 /*
2085 * No.
2086 */
2087 port = NULL;
2088 }
2089 }
2090 free(authority);
2091
2092 /*
2093 * Everything else is the path. Strip off the leading /.
2094 */
2095 if (*endp == '\0')
2096 path = strdup("");
2097 else
2098 path = strdup(endp + 1);
2099 if (path == NULL) {
2100 pcapint_fmt_errmsg_for_errno(ebuf, PCAP_ERRBUF_SIZE,
2101 errno, "malloc");
2102 free(port);
2103 free(host);
2104 free(userinfo);
2105 free(scheme);
2106 return (-1);
2107 }
2108 *schemep = scheme;
2109 *userinfop = userinfo;
2110 *hostp = host;
2111 *portp = port;
2112 *pathp = path;
2113 return (0);
2114 }
2115
2116 int
2117 pcapint_createsrcstr_ex(char *source, int type, const char *host, const char *port,
2118 const char *name, unsigned char uses_ssl, char *errbuf)
2119 {
2120 switch (type) {
2121
2122 case PCAP_SRC_FILE:
2123 pcapint_strlcpy(source, PCAP_SRC_FILE_STRING, PCAP_BUF_SIZE);
2124 if (name != NULL && *name != '\0') {
2125 pcapint_strlcat(source, name, PCAP_BUF_SIZE);
2126 return (0);
2127 } else {
2128 snprintf(errbuf, PCAP_ERRBUF_SIZE,
2129 "The file name cannot be NULL.");
2130 return (-1);
2131 }
2132
2133 case PCAP_SRC_IFREMOTE:
2134 pcapint_strlcpy(source,
2135 (uses_ssl ? "rpcaps://" : PCAP_SRC_IF_STRING),
2136 PCAP_BUF_SIZE);
2137 if (host != NULL && *host != '\0') {
2138 if (strchr(host, ':') != NULL) {
2139 /*
2140 * The host name contains a colon, so it's
2141 * probably an IPv6 address, and needs to
2142 * be included in square brackets.
2143 */
2144 pcapint_strlcat(source, "[", PCAP_BUF_SIZE);
2145 pcapint_strlcat(source, host, PCAP_BUF_SIZE);
2146 pcapint_strlcat(source, "]", PCAP_BUF_SIZE);
2147 } else
2148 pcapint_strlcat(source, host, PCAP_BUF_SIZE);
2149
2150 if (port != NULL && *port != '\0') {
2151 pcapint_strlcat(source, ":", PCAP_BUF_SIZE);
2152 pcapint_strlcat(source, port, PCAP_BUF_SIZE);
2153 }
2154
2155 pcapint_strlcat(source, "/", PCAP_BUF_SIZE);
2156 } else {
2157 snprintf(errbuf, PCAP_ERRBUF_SIZE,
2158 "The host name cannot be NULL.");
2159 return (-1);
2160 }
2161
2162 if (name != NULL && *name != '\0')
2163 pcapint_strlcat(source, name, PCAP_BUF_SIZE);
2164
2165 return (0);
2166
2167 case PCAP_SRC_IFLOCAL:
2168 pcapint_strlcpy(source, PCAP_SRC_IF_STRING, PCAP_BUF_SIZE);
2169
2170 if (name != NULL && *name != '\0')
2171 pcapint_strlcat(source, name, PCAP_BUF_SIZE);
2172
2173 return (0);
2174
2175 default:
2176 snprintf(errbuf, PCAP_ERRBUF_SIZE,
2177 "The interface type is not valid.");
2178 return (-1);
2179 }
2180 }
2181
2182
2183 int
2184 pcap_createsrcstr(char *source, int type, const char *host, const char *port,
2185 const char *name, char *errbuf)
2186 {
2187 return (pcapint_createsrcstr_ex(source, type, host, port, name, 0, errbuf));
2188 }
2189
2190 int
2191 pcapint_parsesrcstr_ex(const char *source, int *type, char *host, char *port,
2192 char *name, unsigned char *uses_ssl, char *errbuf)
2193 {
2194 char *scheme, *tmpuserinfo, *tmphost, *tmpport, *tmppath;
2195
2196 /* Initialization stuff */
2197 if (host)
2198 *host = '\0';
2199 if (port)
2200 *port = '\0';
2201 if (name)
2202 *name = '\0';
2203 if (uses_ssl)
2204 *uses_ssl = 0;
2205
2206 /* Parse the source string */
2207 if (pcap_parse_source(source, &scheme, &tmpuserinfo, &tmphost,
2208 &tmpport, &tmppath, errbuf) == -1) {
2209 /*
2210 * Fail.
2211 */
2212 return (-1);
2213 }
2214
2215 if (scheme == NULL) {
2216 /*
2217 * Local device.
2218 */
2219 if (name && tmppath)
2220 pcapint_strlcpy(name, tmppath, PCAP_BUF_SIZE);
2221 if (type)
2222 *type = PCAP_SRC_IFLOCAL;
2223 free(tmppath);
2224 free(tmpport);
2225 free(tmphost);
2226 free(tmpuserinfo);
2227 return (0);
2228 }
2229
2230 int is_rpcap = 0;
2231 if (strcmp(scheme, "rpcaps") == 0) {
2232 is_rpcap = 1;
2233 if (uses_ssl) *uses_ssl = 1;
2234 } else if (strcmp(scheme, "rpcap") == 0) {
2235 is_rpcap = 1;
2236 }
2237
2238 if (is_rpcap) {
2239 /*
2240 * rpcap[s]://
2241 *
2242 * pcap_parse_source() has already handled the case of
2243 * rpcap[s]://device
2244 */
2245 if (host && tmphost) {
2246 if (tmpuserinfo)
2247 snprintf(host, PCAP_BUF_SIZE, "%s@%s",
2248 tmpuserinfo, tmphost);
2249 else
2250 pcapint_strlcpy(host, tmphost, PCAP_BUF_SIZE);
2251 }
2252 if (port && tmpport)
2253 pcapint_strlcpy(port, tmpport, PCAP_BUF_SIZE);
2254 if (name && tmppath)
2255 pcapint_strlcpy(name, tmppath, PCAP_BUF_SIZE);
2256 if (type)
2257 *type = PCAP_SRC_IFREMOTE;
2258 free(tmppath);
2259 free(tmpport);
2260 free(tmphost);
2261 free(tmpuserinfo);
2262 free(scheme);
2263 return (0);
2264 }
2265
2266 if (strcmp(scheme, "file") == 0) {
2267 /*
2268 * file://
2269 */
2270 if (name && tmppath)
2271 pcapint_strlcpy(name, tmppath, PCAP_BUF_SIZE);
2272 if (type)
2273 *type = PCAP_SRC_FILE;
2274 free(tmppath);
2275 free(tmpport);
2276 free(tmphost);
2277 free(tmpuserinfo);
2278 free(scheme);
2279 return (0);
2280 }
2281
2282 /*
2283 * Neither rpcap: nor file:; just treat the entire string
2284 * as a local device.
2285 */
2286 if (name)
2287 pcapint_strlcpy(name, source, PCAP_BUF_SIZE);
2288 if (type)
2289 *type = PCAP_SRC_IFLOCAL;
2290 free(tmppath);
2291 free(tmpport);
2292 free(tmphost);
2293 free(tmpuserinfo);
2294 free(scheme);
2295 return (0);
2296 }
2297
2298 int
2299 pcap_parsesrcstr(const char *source, int *type, char *host, char *port,
2300 char *name, char *errbuf)
2301 {
2302 return (pcapint_parsesrcstr_ex(source, type, host, port, name, NULL, errbuf));
2303 }
2304 #endif
2305
2306 pcap_t *
2307 pcap_create(const char *device, char *errbuf)
2308 {
2309 size_t i;
2310 int is_theirs;
2311 pcap_t *p;
2312 char *device_str;
2313
2314 /*
2315 * A null device name is equivalent to the "any" device -
2316 * which might not be supported on this platform, but
2317 * this means that you'll get a "not supported" error
2318 * rather than, say, a crash when we try to dereference
2319 * the null pointer.
2320 */
2321 if (device == NULL)
2322 device_str = strdup("any");
2323 else {
2324 #ifdef _WIN32
2325 /*
2326 * On Windows, for backwards compatibility reasons,
2327 * pcap_lookupdev() returns a pointer to a sequence of
2328 * pairs of UTF-16LE device names and local code page
2329 * description strings.
2330 *
2331 * This means that if a program uses pcap_lookupdev()
2332 * to get a default device, and hands that to an API
2333 * that opens devices, we'll get handed a UTF-16LE
2334 * string, not a string in the local code page.
2335 *
2336 * To work around that, we check whether the string
2337 * looks as if it might be a UTF-16LE string and, if
2338 * so, convert it back to the local code page's
2339 * extended ASCII.
2340 *
2341 * We disable that check in "new API" mode, because:
2342 *
2343 * 1) You *cannot* reliably detect whether a
2344 * string is UTF-16LE or not; "a" could either
2345 * be a one-character ASCII string or the first
2346 * character of a UTF-16LE string.
2347 *
2348 * 2) Doing that test can run past the end of
2349 * the string, if it's a 1-character ASCII
2350 * string
2351 *
2352 * This particular version of this heuristic dates
2353 * back to WinPcap 4.1.1; PacketOpenAdapter() does
2354 * uses the same heuristic, with the exact same
2355 * vulnerability.
2356 *
2357 * That's why we disable this in "new API" mode.
2358 * We keep it around in legacy mode for backwards
2359 * compatibility.
2360 */
2361 if (!pcapint_new_api && device[0] != '\0' && device[1] == '\0') {
2362 size_t length;
2363
2364 length = wcslen((wchar_t *)device);
2365 device_str = (char *)malloc(length + 1);
2366 if (device_str == NULL) {
2367 pcapint_fmt_errmsg_for_errno(errbuf,
2368 PCAP_ERRBUF_SIZE, errno,
2369 "malloc");
2370 return (NULL);
2371 }
2372
2373 snprintf(device_str, length + 1, "%ws",
2374 (const wchar_t *)device);
2375 } else
2376 #endif
2377 device_str = strdup(device);
2378 }
2379 if (device_str == NULL) {
2380 pcapint_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
2381 errno, "malloc");
2382 return (NULL);
2383 }
2384
2385 /*
2386 * Try each of the non-local-network-interface capture
2387 * source types until we find one that works for this
2388 * device or run out of types.
2389 */
2390 for (i = 0; capture_source_types[i].create_op != NULL; i++) {
2391 is_theirs = 0;
2392 p = capture_source_types[i].create_op(device_str, errbuf,
2393 &is_theirs);
2394 if (is_theirs) {
2395 /*
2396 * The device name refers to a device of the
2397 * type in question; either it succeeded,
2398 * in which case p refers to a pcap_t to
2399 * later activate for the device, or it
2400 * failed, in which case p is null and we
2401 * should return that to report the failure
2402 * to create.
2403 */
2404 if (p == NULL) {
2405 /*
2406 * We assume the caller filled in errbuf.
2407 */
2408 free(device_str);
2409 return (NULL);
2410 }
2411 p->opt.device = device_str;
2412 return (p);
2413 }
2414 }
2415
2416 /*
2417 * OK, try it as a regular network interface.
2418 */
2419 p = pcapint_create_interface(device_str, errbuf);
2420 if (p == NULL) {
2421 /*
2422 * We assume the caller filled in errbuf.
2423 */
2424 free(device_str);
2425 return (NULL);
2426 }
2427 p->opt.device = device_str;
2428 return (p);
2429 }
2430
2431 /*
2432 * Set nonblocking mode on an unactivated pcap_t; this sets a flag
2433 * checked by pcap_activate(), which sets the mode after calling
2434 * the activate routine.
2435 */
2436 static int
2437 pcap_setnonblock_unactivated(pcap_t *p, int nonblock)
2438 {
2439 p->opt.nonblock = nonblock;
2440 return (0);
2441 }
2442
2443 static void
2444 initialize_ops(pcap_t *p)
2445 {
2446 /*
2447 * Set operation pointers for operations that only work on
2448 * an activated pcap_t to point to a routine that returns
2449 * a "this isn't activated" error.
2450 */
2451 p->read_op = pcap_read_not_initialized;
2452 p->inject_op = pcap_inject_not_initialized;
2453 p->setfilter_op = pcap_setfilter_not_initialized;
2454 p->setdirection_op = pcap_setdirection_not_initialized;
2455 p->set_datalink_op = pcap_set_datalink_not_initialized;
2456 p->getnonblock_op = pcap_getnonblock_not_initialized;
2457 p->stats_op = pcap_stats_not_initialized;
2458 #ifdef _WIN32
2459 p->stats_ex_op = pcap_stats_ex_not_initialized;
2460 p->setbuff_op = pcap_setbuff_not_initialized;
2461 p->setmode_op = pcap_setmode_not_initialized;
2462 p->setmintocopy_op = pcap_setmintocopy_not_initialized;
2463 p->getevent_op = pcap_getevent_not_initialized;
2464 p->oid_get_request_op = pcap_oid_get_request_not_initialized;
2465 p->oid_set_request_op = pcap_oid_set_request_not_initialized;
2466 p->sendqueue_transmit_op = pcap_sendqueue_transmit_not_initialized;
2467 p->setuserbuffer_op = pcap_setuserbuffer_not_initialized;
2468 p->live_dump_op = pcap_live_dump_not_initialized;
2469 p->live_dump_ended_op = pcap_live_dump_ended_not_initialized;
2470 p->get_airpcap_handle_op = pcap_get_airpcap_handle_not_initialized;
2471 #endif
2472
2473 /*
2474 * Default cleanup operation - implementations can override
2475 * this, but should call pcapint_cleanup_live_common() after
2476 * doing their own additional cleanup.
2477 */
2478 p->cleanup_op = pcapint_cleanup_live_common;
2479
2480 /*
2481 * In most cases, the standard one-shot callback can
2482 * be used for pcap_next()/pcap_next_ex().
2483 */
2484 p->oneshot_callback = pcapint_oneshot;
2485
2486 /*
2487 * Default breakloop operation - implementations can override
2488 * this, but should call pcapint_breakloop_common() before doing
2489 * their own logic.
2490 */
2491 p->breakloop_op = pcapint_breakloop_common;
2492 }
2493
2494 static pcap_t *
2495 pcap_alloc_pcap_t(char *ebuf, size_t total_size, size_t private_offset)
2496 {
2497 char *chunk;
2498 pcap_t *p;
2499
2500 /*
2501 * total_size is the size of a structure containing a pcap_t
2502 * followed by a private structure.
2503 */
2504 chunk = calloc(total_size, 1);
2505 if (chunk == NULL) {
2506 pcapint_fmt_errmsg_for_errno(ebuf, PCAP_ERRBUF_SIZE,
2507 errno, "malloc");
2508 return (NULL);
2509 }
2510
2511 /*
2512 * Get a pointer to the pcap_t at the beginning.
2513 */
2514 p = (pcap_t *)chunk;
2515
2516 #ifdef _WIN32
2517 p->handle = INVALID_HANDLE_VALUE; /* not opened yet */
2518 #else /* _WIN32 */
2519 p->fd = -1; /* not opened yet */
2520 #ifndef MSDOS
2521 p->selectable_fd = -1;
2522 p->required_select_timeout = NULL;
2523 #endif /* MSDOS */
2524 #endif /* _WIN32 */
2525
2526 /*
2527 * private_offset is the offset, in bytes, of the private
2528 * data from the beginning of the structure.
2529 *
2530 * Set the pointer to the private data; that's private_offset
2531 * bytes past the pcap_t.
2532 */
2533 p->priv = (void *)(chunk + private_offset);
2534
2535 return (p);
2536 }
2537
2538 pcap_t *
2539 pcapint_create_common(char *ebuf, size_t total_size, size_t private_offset)
2540 {
2541 pcap_t *p;
2542
2543 p = pcap_alloc_pcap_t(ebuf, total_size, private_offset);
2544 if (p == NULL)
2545 return (NULL);
2546
2547 /*
2548 * Default to "can't set rfmon mode"; if it's supported by
2549 * a platform, the create routine that called us can set
2550 * the op to its routine to check whether a particular
2551 * device supports it.
2552 */
2553 p->can_set_rfmon_op = pcap_cant_set_rfmon;
2554
2555 /*
2556 * If pcap_setnonblock() is called on a not-yet-activated
2557 * pcap_t, default to setting a flag and turning
2558 * on non-blocking mode when activated.
2559 */
2560 p->setnonblock_op = pcap_setnonblock_unactivated;
2561
2562 initialize_ops(p);
2563
2564 /* put in some defaults*/
2565 p->snapshot = 0; /* max packet size unspecified */
2566 p->opt.timeout = 0; /* no timeout specified */
2567 p->opt.buffer_size = 0; /* use the platform's default */
2568 p->opt.promisc = 0;
2569 p->opt.rfmon = 0;
2570 p->opt.immediate = 0;
2571 p->opt.tstamp_type = -1; /* default to not setting time stamp type */
2572 p->opt.tstamp_precision = PCAP_TSTAMP_PRECISION_MICRO;
2573 /*
2574 * Platform-dependent options.
2575 */
2576 #ifdef __linux__
2577 p->opt.protocol = 0;
2578 #endif
2579 #ifdef _WIN32
2580 p->opt.nocapture_local = 0;
2581 #endif
2582
2583 /*
2584 * Start out with no BPF code generation flags set.
2585 */
2586 p->bpf_codegen_flags = 0;
2587
2588 return (p);
2589 }
2590
2591 int
2592 pcapint_check_activated(pcap_t *p)
2593 {
2594 if (p->activated) {
2595 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "can't perform "
2596 " operation on activated capture");
2597 return (-1);
2598 }
2599 return (0);
2600 }
2601
2602 int
2603 pcap_set_snaplen(pcap_t *p, int snaplen)
2604 {
2605 if (pcapint_check_activated(p))
2606 return (PCAP_ERROR_ACTIVATED);
2607 p->snapshot = snaplen;
2608 return (0);
2609 }
2610
2611 int
2612 pcap_set_promisc(pcap_t *p, int promisc)
2613 {
2614 if (pcapint_check_activated(p))
2615 return (PCAP_ERROR_ACTIVATED);
2616 p->opt.promisc = promisc;
2617 return (0);
2618 }
2619
2620 int
2621 pcap_set_rfmon(pcap_t *p, int rfmon)
2622 {
2623 if (pcapint_check_activated(p))
2624 return (PCAP_ERROR_ACTIVATED);
2625 p->opt.rfmon = rfmon;
2626 return (0);
2627 }
2628
2629 int
2630 pcap_set_timeout(pcap_t *p, int timeout_ms)
2631 {
2632 if (pcapint_check_activated(p))
2633 return (PCAP_ERROR_ACTIVATED);
2634 p->opt.timeout = timeout_ms;
2635 return (0);
2636 }
2637
2638 int
2639 pcap_set_tstamp_type(pcap_t *p, int tstamp_type)
2640 {
2641 int i;
2642
2643 if (pcapint_check_activated(p))
2644 return (PCAP_ERROR_ACTIVATED);
2645
2646 /*
2647 * The argument should have been u_int, but that's too late
2648 * to change now - it's an API.
2649 */
2650 if (tstamp_type < 0)
2651 return (PCAP_WARNING_TSTAMP_TYPE_NOTSUP);
2652
2653 /*
2654 * If p->tstamp_type_count is 0, we only support PCAP_TSTAMP_HOST;
2655 * the default time stamp type is PCAP_TSTAMP_HOST.
2656 */
2657 if (p->tstamp_type_count == 0) {
2658 if (tstamp_type == PCAP_TSTAMP_HOST) {
2659 p->opt.tstamp_type = tstamp_type;
2660 return (0);
2661 }
2662 } else {
2663 /*
2664 * Check whether we claim to support this type of time stamp.
2665 */
2666 for (i = 0; i < p->tstamp_type_count; i++) {
2667 if (p->tstamp_type_list[i] == (u_int)tstamp_type) {
2668 /*
2669 * Yes.
2670 */
2671 p->opt.tstamp_type = tstamp_type;
2672 return (0);
2673 }
2674 }
2675 }
2676
2677 /*
2678 * We don't support this type of time stamp.
2679 */
2680 return (PCAP_WARNING_TSTAMP_TYPE_NOTSUP);
2681 }
2682
2683 int
2684 pcap_set_immediate_mode(pcap_t *p, int immediate)
2685 {
2686 if (pcapint_check_activated(p))
2687 return (PCAP_ERROR_ACTIVATED);
2688 p->opt.immediate = immediate;
2689 return (0);
2690 }
2691
2692 int
2693 pcap_set_buffer_size(pcap_t *p, int buffer_size)
2694 {
2695 if (pcapint_check_activated(p))
2696 return (PCAP_ERROR_ACTIVATED);
2697 if (buffer_size <= 0) {
2698 /*
2699 * Silently ignore invalid values.
2700 */
2701 return (0);
2702 }
2703 p->opt.buffer_size = buffer_size;
2704 return (0);
2705 }
2706
2707 int
2708 pcap_set_tstamp_precision(pcap_t *p, int tstamp_precision)
2709 {
2710 int i;
2711
2712 if (pcapint_check_activated(p))
2713 return (PCAP_ERROR_ACTIVATED);
2714
2715 /*
2716 * The argument should have been u_int, but that's too late
2717 * to change now - it's an API.
2718 */
2719 if (tstamp_precision < 0)
2720 return (PCAP_ERROR_TSTAMP_PRECISION_NOTSUP);
2721
2722 /*
2723 * If p->tstamp_precision_count is 0, we only support setting
2724 * the time stamp precision to microsecond precision; every
2725 * pcap module *MUST* support microsecond precision, even if
2726 * it does so by converting the native precision to
2727 * microseconds.
2728 */
2729 if (p->tstamp_precision_count == 0) {
2730 if (tstamp_precision == PCAP_TSTAMP_PRECISION_MICRO) {
2731 p->opt.tstamp_precision = tstamp_precision;
2732 return (0);
2733 }
2734 } else {
2735 /*
2736 * Check whether we claim to support this precision of
2737 * time stamp.
2738 */
2739 for (i = 0; i < p->tstamp_precision_count; i++) {
2740 if (p->tstamp_precision_list[i] == (u_int)tstamp_precision) {
2741 /*
2742 * Yes.
2743 */
2744 p->opt.tstamp_precision = tstamp_precision;
2745 return (0);
2746 }
2747 }
2748 }
2749
2750 /*
2751 * We don't support this time stamp precision.
2752 */
2753 return (PCAP_ERROR_TSTAMP_PRECISION_NOTSUP);
2754 }
2755
2756 int
2757 pcap_get_tstamp_precision(pcap_t *p)
2758 {
2759 return (p->opt.tstamp_precision);
2760 }
2761
2762 int
2763 pcap_activate(pcap_t *p)
2764 {
2765 int status;
2766
2767 /*
2768 * Catch attempts to re-activate an already-activated
2769 * pcap_t; this should, for example, catch code that
2770 * calls pcap_open_live() followed by pcap_activate(),
2771 * as some code that showed up in a Stack Exchange
2772 * question did.
2773 */
2774 if (pcapint_check_activated(p))
2775 return (PCAP_ERROR_ACTIVATED);
2776 status = p->activate_op(p);
2777 if (status >= 0) {
2778 /*
2779 * If somebody requested non-blocking mode before
2780 * calling pcap_activate(), turn it on now.
2781 */
2782 if (p->opt.nonblock) {
2783 status = p->setnonblock_op(p, 1);
2784 if (status < 0) {
2785 /*
2786 * Failed. Undo everything done by
2787 * the activate operation.
2788 */
2789 p->cleanup_op(p);
2790 initialize_ops(p);
2791 return (status);
2792 }
2793 }
2794 p->activated = 1;
2795 } else {
2796 if (p->errbuf[0] == '\0') {
2797 /*
2798 * No error message supplied by the activate routine;
2799 * for the benefit of programs that don't specially
2800 * handle errors other than PCAP_ERROR, return the
2801 * error message corresponding to the status.
2802 */
2803 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "%s",
2804 pcap_statustostr(status));
2805 }
2806
2807 /*
2808 * Undo any operation pointer setting, etc. done by
2809 * the activate operation.
2810 */
2811 initialize_ops(p);
2812 }
2813 return (status);
2814 }
2815
2816 pcap_t *
2817 pcap_open_live(const char *device, int snaplen, int promisc, int to_ms, char *errbuf)
2818 {
2819 pcap_t *p;
2820 int status;
2821 #ifdef ENABLE_REMOTE
2822 char host[PCAP_BUF_SIZE + 1];
2823 char port[PCAP_BUF_SIZE + 1];
2824 char name[PCAP_BUF_SIZE + 1];
2825 int srctype;
2826
2827 /*
2828 * A null device name is equivalent to the "any" device -
2829 * which might not be supported on this platform, but
2830 * this means that you'll get a "not supported" error
2831 * rather than, say, a crash when we try to dereference
2832 * the null pointer.
2833 */
2834 if (device == NULL)
2835 device = "any";
2836
2837 /*
2838 * Retrofit - we have to make older applications compatible with
2839 * remote capture.
2840 * So we're calling pcap_open_remote() from here; this is a very
2841 * dirty hack.
2842 * Obviously, we cannot exploit all the new features; for instance,
2843 * we cannot send authentication, we cannot use a UDP data connection,
2844 * and so on.
2845 */
2846 if (pcap_parsesrcstr(device, &srctype, host, port, name, errbuf))
2847 return (NULL);
2848
2849 if (srctype == PCAP_SRC_IFREMOTE) {
2850 /*
2851 * Although we already have host, port and iface, we prefer
2852 * to pass only 'device' to pcap_open_rpcap(), so that it has
2853 * to call pcap_parsesrcstr() again.
2854 * This is less optimized, but much clearer.
2855 */
2856 return (pcap_open_rpcap(device, snaplen,
2857 promisc ? PCAP_OPENFLAG_PROMISCUOUS : 0, to_ms,
2858 NULL, errbuf));
2859 }
2860 if (srctype == PCAP_SRC_FILE) {
2861 snprintf(errbuf, PCAP_ERRBUF_SIZE, "unknown URL scheme \"file\"");
2862 return (NULL);
2863 }
2864 if (srctype == PCAP_SRC_IFLOCAL) {
2865 /*
2866 * If it starts with rpcap://, that refers to a local device
2867 * (no host part in the URL). Remove the rpcap://, and
2868 * fall through to the regular open path.
2869 */
2870 if (strncmp(device, PCAP_SRC_IF_STRING, strlen(PCAP_SRC_IF_STRING)) == 0) {
2871 size_t len = strlen(device) - strlen(PCAP_SRC_IF_STRING) + 1;
2872
2873 if (len > 0)
2874 device += strlen(PCAP_SRC_IF_STRING);
2875 }
2876 }
2877 #endif /* ENABLE_REMOTE */
2878
2879 p = pcap_create(device, errbuf);
2880 if (p == NULL)
2881 return (NULL);
2882 status = pcap_set_snaplen(p, snaplen);
2883 if (status < 0)
2884 goto fail;
2885 status = pcap_set_promisc(p, promisc);
2886 if (status < 0)
2887 goto fail;
2888 status = pcap_set_timeout(p, to_ms);
2889 if (status < 0)
2890 goto fail;
2891 /*
2892 * Mark this as opened with pcap_open_live(), so that, for
2893 * example, we show the full list of DLT_ values, rather
2894 * than just the ones that are compatible with capturing
2895 * when not in monitor mode. That allows existing applications
2896 * to work the way they used to work, but allows new applications
2897 * that know about the new open API to, for example, find out the
2898 * DLT_ values that they can select without changing whether
2899 * the adapter is in monitor mode or not.
2900 */
2901 p->oldstyle = 1;
2902 status = pcap_activate(p);
2903 if (status < 0)
2904 goto fail;
2905 return (p);
2906 fail:
2907 if (status == PCAP_ERROR) {
2908 /*
2909 * Another buffer is a bit cumbersome, but it avoids
2910 * -Wformat-truncation.
2911 */
2912 char trimbuf[PCAP_ERRBUF_SIZE - 5]; /* 2 bytes shorter */
2913
2914 pcapint_strlcpy(trimbuf, p->errbuf, sizeof(trimbuf));
2915 snprintf(errbuf, PCAP_ERRBUF_SIZE, "%s: %.*s", device,
2916 PCAP_ERRBUF_SIZE - 3, trimbuf);
2917 } else if (status == PCAP_ERROR_NO_SUCH_DEVICE ||
2918 status == PCAP_ERROR_PERM_DENIED ||
2919 status == PCAP_ERROR_PROMISC_PERM_DENIED) {
2920 /*
2921 * Only show the additional message if it's not
2922 * empty.
2923 */
2924 if (p->errbuf[0] != '\0') {
2925 /*
2926 * Idem.
2927 */
2928 char trimbuf[PCAP_ERRBUF_SIZE - 8]; /* 2 bytes shorter */
2929
2930 pcapint_strlcpy(trimbuf, p->errbuf, sizeof(trimbuf));
2931 snprintf(errbuf, PCAP_ERRBUF_SIZE, "%s: %s (%.*s)",
2932 device, pcap_statustostr(status),
2933 PCAP_ERRBUF_SIZE - 6, trimbuf);
2934 } else {
2935 snprintf(errbuf, PCAP_ERRBUF_SIZE, "%s: %s",
2936 device, pcap_statustostr(status));
2937 }
2938 } else {
2939 snprintf(errbuf, PCAP_ERRBUF_SIZE, "%s: %s", device,
2940 pcap_statustostr(status));
2941 }
2942 pcap_close(p);
2943 return (NULL);
2944 }
2945
2946 pcap_t *
2947 pcapint_open_offline_common(char *ebuf, size_t total_size, size_t private_offset)
2948 {
2949 pcap_t *p;
2950
2951 p = pcap_alloc_pcap_t(ebuf, total_size, private_offset);
2952 if (p == NULL)
2953 return (NULL);
2954
2955 p->opt.tstamp_precision = PCAP_TSTAMP_PRECISION_MICRO;
2956
2957 return (p);
2958 }
2959
2960 int
2961 pcap_dispatch(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
2962 {
2963 return (p->read_op(p, cnt, callback, user));
2964 }
2965
2966 int
2967 pcap_loop(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
2968 {
2969 register int n;
2970
2971 for (;;) {
2972 if (p->rfile != NULL) {
2973 /*
2974 * 0 means EOF, so don't loop if we get 0.
2975 */
2976 n = pcapint_offline_read(p, cnt, callback, user);
2977 } else {
2978 /*
2979 * XXX keep reading until we get something
2980 * (or an error occurs)
2981 */
2982 do {
2983 n = p->read_op(p, cnt, callback, user);
2984 } while (n == 0);
2985 }
2986 if (n <= 0)
2987 return (n);
2988 if (!PACKET_COUNT_IS_UNLIMITED(cnt)) {
2989 cnt -= n;
2990 if (cnt <= 0)
2991 return (0);
2992 }
2993 }
2994 }
2995
2996 /*
2997 * Force the loop in "pcap_read()" or "pcap_read_offline()" to terminate.
2998 */
2999 void
3000 pcap_breakloop(pcap_t *p)
3001 {
3002 p->breakloop_op(p);
3003 }
3004
3005 int
3006 pcap_datalink(pcap_t *p)
3007 {
3008 if (!p->activated)
3009 return (PCAP_ERROR_NOT_ACTIVATED);
3010 return (p->linktype);
3011 }
3012
3013 int
3014 pcap_datalink_ext(pcap_t *p)
3015 {
3016 if (!p->activated)
3017 return (PCAP_ERROR_NOT_ACTIVATED);
3018 return (p->linktype_ext);
3019 }
3020
3021 int
3022 pcap_list_datalinks(pcap_t *p, int **dlt_buffer)
3023 {
3024 if (!p->activated)
3025 return (PCAP_ERROR_NOT_ACTIVATED);
3026 if (p->dlt_count == 0) {
3027 /*
3028 * We couldn't fetch the list of DLTs, which means
3029 * this platform doesn't support changing the
3030 * DLT for an interface. Return a list of DLTs
3031 * containing only the DLT this device supports.
3032 */
3033 *dlt_buffer = (int*)malloc(sizeof(**dlt_buffer));
3034 if (*dlt_buffer == NULL) {
3035 pcapint_fmt_errmsg_for_errno(p->errbuf, sizeof(p->errbuf),
3036 errno, "malloc");
3037 return (PCAP_ERROR);
3038 }
3039 **dlt_buffer = p->linktype;
3040 return (1);
3041 } else {
3042 *dlt_buffer = (int*)calloc(p->dlt_count, sizeof(**dlt_buffer));
3043 if (*dlt_buffer == NULL) {
3044 pcapint_fmt_errmsg_for_errno(p->errbuf, sizeof(p->errbuf),
3045 errno, "malloc");
3046 return (PCAP_ERROR);
3047 }
3048 (void)memcpy(*dlt_buffer, p->dlt_list,
3049 sizeof(**dlt_buffer) * p->dlt_count);
3050 return (p->dlt_count);
3051 }
3052 }
3053
3054 /*
3055 * In Windows, you might have a library built with one version of the
3056 * C runtime library and an application built with another version of
3057 * the C runtime library, which means that the library might use one
3058 * version of malloc() and free() and the application might use another
3059 * version of malloc() and free(). If so, that means something
3060 * allocated by the library cannot be freed by the application, so we
3061 * need to have a pcap_free_datalinks() routine to free up the list
3062 * allocated by pcap_list_datalinks(), even though it's just a wrapper
3063 * around free().
3064 */
3065 void
3066 pcap_free_datalinks(int *dlt_list)
3067 {
3068 free(dlt_list);
3069 }
3070
3071 int
3072 pcap_set_datalink(pcap_t *p, int dlt)
3073 {
3074 int i;
3075 const char *dlt_name;
3076
3077 if (dlt < 0)
3078 goto unsupported;
3079
3080 if (p->dlt_count == 0 || p->set_datalink_op == NULL) {
3081 /*
3082 * We couldn't fetch the list of DLTs, or we don't
3083 * have a "set datalink" operation, which means
3084 * this platform doesn't support changing the
3085 * DLT for an interface. Check whether the new
3086 * DLT is the one this interface supports.
3087 */
3088 if (p->linktype != dlt)
3089 goto unsupported;
3090
3091 /*
3092 * It is, so there's nothing we need to do here.
3093 */
3094 return (0);
3095 }
3096 for (i = 0; i < p->dlt_count; i++)
3097 if (p->dlt_list[i] == (u_int)dlt)
3098 break;
3099 if (i >= p->dlt_count)
3100 goto unsupported;
3101 if (p->dlt_count == 2 && p->dlt_list[0] == DLT_EN10MB &&
3102 dlt == DLT_DOCSIS) {
3103 /*
3104 * This is presumably an Ethernet device, as the first
3105 * link-layer type it offers is DLT_EN10MB, and the only
3106 * other type it offers is DLT_DOCSIS. That means that
3107 * we can't tell the driver to supply DOCSIS link-layer
3108 * headers - we're just pretending that's what we're
3109 * getting, as, presumably, we're capturing on a dedicated
3110 * link to a Cisco Cable Modem Termination System, and
3111 * it's putting raw DOCSIS frames on the wire inside low-level
3112 * Ethernet framing.
3113 */
3114 p->linktype = dlt;
3115 return (0);
3116 }
3117 if (p->set_datalink_op(p, dlt) == -1)
3118 return (-1);
3119 p->linktype = dlt;
3120 return (0);
3121
3122 unsupported:
3123 dlt_name = pcap_datalink_val_to_name(dlt);
3124 if (dlt_name != NULL) {
3125 (void) snprintf(p->errbuf, sizeof(p->errbuf),
3126 "%s is not one of the DLTs supported by this device",
3127 dlt_name);
3128 } else {
3129 (void) snprintf(p->errbuf, sizeof(p->errbuf),
3130 "DLT %d is not one of the DLTs supported by this device",
3131 dlt);
3132 }
3133 return (-1);
3134 }
3135
3136 /*
3137 * This array is designed for mapping upper and lower case letter
3138 * together for a case independent comparison. The mappings are
3139 * based upon ascii character sequences.
3140 */
3141 static const u_char charmap[] = {
3142 (u_char)'\000', (u_char)'\001', (u_char)'\002', (u_char)'\003',
3143 (u_char)'\004', (u_char)'\005', (u_char)'\006', (u_char)'\007',
3144 (u_char)'\010', (u_char)'\011', (u_char)'\012', (u_char)'\013',
3145 (u_char)'\014', (u_char)'\015', (u_char)'\016', (u_char)'\017',
3146 (u_char)'\020', (u_char)'\021', (u_char)'\022', (u_char)'\023',
3147 (u_char)'\024', (u_char)'\025', (u_char)'\026', (u_char)'\027',
3148 (u_char)'\030', (u_char)'\031', (u_char)'\032', (u_char)'\033',
3149 (u_char)'\034', (u_char)'\035', (u_char)'\036', (u_char)'\037',
3150 (u_char)'\040', (u_char)'\041', (u_char)'\042', (u_char)'\043',
3151 (u_char)'\044', (u_char)'\045', (u_char)'\046', (u_char)'\047',
3152 (u_char)'\050', (u_char)'\051', (u_char)'\052', (u_char)'\053',
3153 (u_char)'\054', (u_char)'\055', (u_char)'\056', (u_char)'\057',
3154 (u_char)'\060', (u_char)'\061', (u_char)'\062', (u_char)'\063',
3155 (u_char)'\064', (u_char)'\065', (u_char)'\066', (u_char)'\067',
3156 (u_char)'\070', (u_char)'\071', (u_char)'\072', (u_char)'\073',
3157 (u_char)'\074', (u_char)'\075', (u_char)'\076', (u_char)'\077',
3158 (u_char)'\100', (u_char)'\141', (u_char)'\142', (u_char)'\143',
3159 (u_char)'\144', (u_char)'\145', (u_char)'\146', (u_char)'\147',
3160 (u_char)'\150', (u_char)'\151', (u_char)'\152', (u_char)'\153',
3161 (u_char)'\154', (u_char)'\155', (u_char)'\156', (u_char)'\157',
3162 (u_char)'\160', (u_char)'\161', (u_char)'\162', (u_char)'\163',
3163 (u_char)'\164', (u_char)'\165', (u_char)'\166', (u_char)'\167',
3164 (u_char)'\170', (u_char)'\171', (u_char)'\172', (u_char)'\133',
3165 (u_char)'\134', (u_char)'\135', (u_char)'\136', (u_char)'\137',
3166 (u_char)'\140', (u_char)'\141', (u_char)'\142', (u_char)'\143',
3167 (u_char)'\144', (u_char)'\145', (u_char)'\146', (u_char)'\147',
3168 (u_char)'\150', (u_char)'\151', (u_char)'\152', (u_char)'\153',
3169 (u_char)'\154', (u_char)'\155', (u_char)'\156', (u_char)'\157',
3170 (u_char)'\160', (u_char)'\161', (u_char)'\162', (u_char)'\163',
3171 (u_char)'\164', (u_char)'\165', (u_char)'\166', (u_char)'\167',
3172 (u_char)'\170', (u_char)'\171', (u_char)'\172', (u_char)'\173',
3173 (u_char)'\174', (u_char)'\175', (u_char)'\176', (u_char)'\177',
3174 (u_char)'\200', (u_char)'\201', (u_char)'\202', (u_char)'\203',
3175 (u_char)'\204', (u_char)'\205', (u_char)'\206', (u_char)'\207',
3176 (u_char)'\210', (u_char)'\211', (u_char)'\212', (u_char)'\213',
3177 (u_char)'\214', (u_char)'\215', (u_char)'\216', (u_char)'\217',
3178 (u_char)'\220', (u_char)'\221', (u_char)'\222', (u_char)'\223',
3179 (u_char)'\224', (u_char)'\225', (u_char)'\226', (u_char)'\227',
3180 (u_char)'\230', (u_char)'\231', (u_char)'\232', (u_char)'\233',
3181 (u_char)'\234', (u_char)'\235', (u_char)'\236', (u_char)'\237',
3182 (u_char)'\240', (u_char)'\241', (u_char)'\242', (u_char)'\243',
3183 (u_char)'\244', (u_char)'\245', (u_char)'\246', (u_char)'\247',
3184 (u_char)'\250', (u_char)'\251', (u_char)'\252', (u_char)'\253',
3185 (u_char)'\254', (u_char)'\255', (u_char)'\256', (u_char)'\257',
3186 (u_char)'\260', (u_char)'\261', (u_char)'\262', (u_char)'\263',
3187 (u_char)'\264', (u_char)'\265', (u_char)'\266', (u_char)'\267',
3188 (u_char)'\270', (u_char)'\271', (u_char)'\272', (u_char)'\273',
3189 (u_char)'\274', (u_char)'\275', (u_char)'\276', (u_char)'\277',
3190 (u_char)'\300', (u_char)'\341', (u_char)'\342', (u_char)'\343',
3191 (u_char)'\344', (u_char)'\345', (u_char)'\346', (u_char)'\347',
3192 (u_char)'\350', (u_char)'\351', (u_char)'\352', (u_char)'\353',
3193 (u_char)'\354', (u_char)'\355', (u_char)'\356', (u_char)'\357',
3194 (u_char)'\360', (u_char)'\361', (u_char)'\362', (u_char)'\363',
3195 (u_char)'\364', (u_char)'\365', (u_char)'\366', (u_char)'\367',
3196 (u_char)'\370', (u_char)'\371', (u_char)'\372', (u_char)'\333',
3197 (u_char)'\334', (u_char)'\335', (u_char)'\336', (u_char)'\337',
3198 (u_char)'\340', (u_char)'\341', (u_char)'\342', (u_char)'\343',
3199 (u_char)'\344', (u_char)'\345', (u_char)'\346', (u_char)'\347',
3200 (u_char)'\350', (u_char)'\351', (u_char)'\352', (u_char)'\353',
3201 (u_char)'\354', (u_char)'\355', (u_char)'\356', (u_char)'\357',
3202 (u_char)'\360', (u_char)'\361', (u_char)'\362', (u_char)'\363',
3203 (u_char)'\364', (u_char)'\365', (u_char)'\366', (u_char)'\367',
3204 (u_char)'\370', (u_char)'\371', (u_char)'\372', (u_char)'\373',
3205 (u_char)'\374', (u_char)'\375', (u_char)'\376', (u_char)'\377',
3206 };
3207
3208 int
3209 pcapint_strcasecmp(const char *s1, const char *s2)
3210 {
3211 register const u_char *cm = charmap,
3212 *us1 = (const u_char *)s1,
3213 *us2 = (const u_char *)s2;
3214
3215 while (cm[*us1] == cm[*us2++])
3216 if (*us1++ == '\0')
3217 return(0);
3218 return (cm[*us1] - cm[*--us2]);
3219 }
3220
3221 struct dlt_choice {
3222 const char *name;
3223 const char *description;
3224 int dlt;
3225 };
3226
3227 #define DLT_CHOICE(code, description) { #code, description, DLT_ ## code }
3228 #define DLT_CHOICE_SENTINEL { NULL, NULL, 0 }
3229
3230 static struct dlt_choice dlt_choices[] = {
3231 DLT_CHOICE(NULL, "BSD loopback"),
3232 DLT_CHOICE(EN10MB, "Ethernet"),
3233 DLT_CHOICE(IEEE802, "Token ring"),
3234 DLT_CHOICE(ARCNET, "BSD ARCNET"),
3235 DLT_CHOICE(SLIP, "SLIP"),
3236 DLT_CHOICE(PPP, "PPP"),
3237 DLT_CHOICE(FDDI, "FDDI"),
3238 DLT_CHOICE(ATM_RFC1483, "RFC 1483 LLC-encapsulated ATM"),
3239 DLT_CHOICE(RAW, "Raw IP"),
3240 DLT_CHOICE(SLIP_BSDOS, "BSD/OS SLIP"),
3241 DLT_CHOICE(PPP_BSDOS, "BSD/OS PPP"),
3242 DLT_CHOICE(ATM_CLIP, "Linux Classical IP over ATM"),
3243 DLT_CHOICE(PPP_SERIAL, "PPP over serial"),
3244 DLT_CHOICE(PPP_ETHER, "PPPoE"),
3245 DLT_CHOICE(SYMANTEC_FIREWALL, "Symantec Firewall"),
3246 DLT_CHOICE(C_HDLC, "Cisco HDLC"),
3247 DLT_CHOICE(IEEE802_11, "802.11"),
3248 DLT_CHOICE(FRELAY, "Frame Relay"),
3249 DLT_CHOICE(LOOP, "OpenBSD loopback"),
3250 DLT_CHOICE(ENC, "OpenBSD encapsulated IP"),
3251 DLT_CHOICE(LINUX_SLL, "Linux cooked v1"),
3252 DLT_CHOICE(LTALK, "Localtalk"),
3253 DLT_CHOICE(PFLOG, "OpenBSD pflog file"),
3254 DLT_CHOICE(PFSYNC, "Packet filter state syncing"),
3255 DLT_CHOICE(PRISM_HEADER, "802.11 plus Prism header"),
3256 DLT_CHOICE(IP_OVER_FC, "RFC 2625 IP-over-Fibre Channel"),
3257 DLT_CHOICE(SUNATM, "Sun raw ATM"),
3258 DLT_CHOICE(IEEE802_11_RADIO, "802.11 plus radiotap header"),
3259 DLT_CHOICE(ARCNET_LINUX, "Linux ARCNET"),
3260 DLT_CHOICE(JUNIPER_MLPPP, "Juniper Multi-Link PPP"),
3261 DLT_CHOICE(JUNIPER_MLFR, "Juniper Multi-Link Frame Relay"),
3262 DLT_CHOICE(JUNIPER_ES, "Juniper Encryption Services PIC"),
3263 DLT_CHOICE(JUNIPER_GGSN, "Juniper GGSN PIC"),
3264 DLT_CHOICE(JUNIPER_MFR, "Juniper FRF.16 Frame Relay"),
3265 DLT_CHOICE(JUNIPER_ATM2, "Juniper ATM2 PIC"),
3266 DLT_CHOICE(JUNIPER_SERVICES, "Juniper Advanced Services PIC"),
3267 DLT_CHOICE(JUNIPER_ATM1, "Juniper ATM1 PIC"),
3268 DLT_CHOICE(APPLE_IP_OVER_IEEE1394, "Apple IP-over-IEEE 1394"),
3269 DLT_CHOICE(MTP2_WITH_PHDR, "SS7 MTP2 with Pseudo-header"),
3270 DLT_CHOICE(MTP2, "SS7 MTP2"),
3271 DLT_CHOICE(MTP3, "SS7 MTP3"),
3272 DLT_CHOICE(SCCP, "SS7 SCCP"),
3273 DLT_CHOICE(DOCSIS, "DOCSIS"),
3274 DLT_CHOICE(LINUX_IRDA, "Linux IrDA"),
3275 DLT_CHOICE(IEEE802_11_RADIO_AVS, "802.11 plus AVS radio information header"),
3276 DLT_CHOICE(JUNIPER_MONITOR, "Juniper Passive Monitor PIC"),
3277 DLT_CHOICE(BACNET_MS_TP, "BACnet MS/TP"),
3278 DLT_CHOICE(PPP_PPPD, "PPP for pppd, with direction flag"),
3279 DLT_CHOICE(JUNIPER_PPPOE, "Juniper PPPoE"),
3280 DLT_CHOICE(JUNIPER_PPPOE_ATM, "Juniper PPPoE/ATM"),
3281 DLT_CHOICE(GPRS_LLC, "GPRS LLC"),
3282 DLT_CHOICE(GPF_T, "GPF-T"),
3283 DLT_CHOICE(GPF_F, "GPF-F"),
3284 DLT_CHOICE(JUNIPER_PIC_PEER, "Juniper PIC Peer"),
3285 DLT_CHOICE(ERF_ETH, "Ethernet with Endace ERF header"),
3286 DLT_CHOICE(ERF_POS, "Packet-over-SONET with Endace ERF header"),
3287 DLT_CHOICE(LINUX_LAPD, "Linux vISDN LAPD"),
3288 DLT_CHOICE(JUNIPER_ETHER, "Juniper Ethernet"),
3289 DLT_CHOICE(JUNIPER_PPP, "Juniper PPP"),
3290 DLT_CHOICE(JUNIPER_FRELAY, "Juniper Frame Relay"),
3291 DLT_CHOICE(JUNIPER_CHDLC, "Juniper C-HDLC"),
3292 DLT_CHOICE(MFR, "FRF.16 Frame Relay"),
3293 DLT_CHOICE(JUNIPER_VP, "Juniper Voice PIC"),
3294 DLT_CHOICE(A429, "Arinc 429"),
3295 DLT_CHOICE(A653_ICM, "Arinc 653 Interpartition Communication"),
3296 DLT_CHOICE(USB_FREEBSD, "USB with FreeBSD header"),
3297 DLT_CHOICE(BLUETOOTH_HCI_H4, "Bluetooth HCI UART transport layer"),
3298 DLT_CHOICE(IEEE802_16_MAC_CPS, "IEEE 802.16 MAC Common Part Sublayer"),
3299 DLT_CHOICE(USB_LINUX, "USB with Linux header"),
3300 DLT_CHOICE(CAN20B, "Controller Area Network (CAN) v. 2.0B"),
3301 DLT_CHOICE(IEEE802_15_4_LINUX, "IEEE 802.15.4 with Linux padding"),
3302 DLT_CHOICE(PPI, "Per-Packet Information"),
3303 DLT_CHOICE(IEEE802_16_MAC_CPS_RADIO, "IEEE 802.16 MAC Common Part Sublayer plus radiotap header"),
3304 DLT_CHOICE(JUNIPER_ISM, "Juniper Integrated Service Module"),
3305 DLT_CHOICE(IEEE802_15_4, "IEEE 802.15.4 with FCS"),
3306 DLT_CHOICE(SITA, "SITA pseudo-header"),
3307 DLT_CHOICE(ERF, "Endace ERF header"),
3308 DLT_CHOICE(RAIF1, "Ethernet with u10 Networks pseudo-header"),
3309 DLT_CHOICE(IPMB_KONTRON, "IPMB with Kontron pseudo-header"),
3310 DLT_CHOICE(JUNIPER_ST, "Juniper Secure Tunnel"),
3311 DLT_CHOICE(BLUETOOTH_HCI_H4_WITH_PHDR, "Bluetooth HCI UART transport layer plus pseudo-header"),
3312 DLT_CHOICE(AX25_KISS, "AX.25 with KISS header"),
3313 DLT_CHOICE(IPMB_LINUX, "IPMB with Linux/Pigeon Point pseudo-header"),
3314 DLT_CHOICE(IEEE802_15_4_NONASK_PHY, "IEEE 802.15.4 with non-ASK PHY data"),
3315 DLT_CHOICE(MPLS, "MPLS with label as link-layer header"),
3316 DLT_CHOICE(LINUX_EVDEV, "Linux evdev events"),
3317 DLT_CHOICE(USB_LINUX_MMAPPED, "USB with padded Linux header"),
3318 DLT_CHOICE(DECT, "DECT"),
3319 DLT_CHOICE(AOS, "AOS Space Data Link protocol"),
3320 DLT_CHOICE(WIHART, "WirelessHART"),
3321 DLT_CHOICE(FC_2, "Fibre Channel FC-2"),
3322 DLT_CHOICE(FC_2_WITH_FRAME_DELIMS, "Fibre Channel FC-2 with frame delimiters"),
3323 DLT_CHOICE(IPNET, "Solaris ipnet"),
3324 DLT_CHOICE(CAN_SOCKETCAN, "CAN-bus with SocketCAN headers"),
3325 DLT_CHOICE(IPV4, "Raw IPv4"),
3326 DLT_CHOICE(IPV6, "Raw IPv6"),
3327 DLT_CHOICE(IEEE802_15_4_NOFCS, "IEEE 802.15.4 without FCS"),
3328 DLT_CHOICE(DBUS, "D-Bus"),
3329 DLT_CHOICE(JUNIPER_VS, "Juniper Virtual Server"),
3330 DLT_CHOICE(JUNIPER_SRX_E2E, "Juniper SRX E2E"),
3331 DLT_CHOICE(JUNIPER_FIBRECHANNEL, "Juniper Fibre Channel"),
3332 DLT_CHOICE(DVB_CI, "DVB-CI"),
3333 DLT_CHOICE(MUX27010, "MUX27010"),
3334 DLT_CHOICE(STANAG_5066_D_PDU, "STANAG 5066 D_PDUs"),
3335 DLT_CHOICE(JUNIPER_ATM_CEMIC, "Juniper ATM CEMIC"),
3336 DLT_CHOICE(NFLOG, "Linux netfilter log messages"),
3337 DLT_CHOICE(NETANALYZER, "Ethernet with Hilscher netANALYZER pseudo-header"),
3338 DLT_CHOICE(NETANALYZER_TRANSPARENT, "Ethernet with Hilscher netANALYZER pseudo-header and with preamble and SFD"),
3339 DLT_CHOICE(IPOIB, "RFC 4391 IP-over-Infiniband"),
3340 DLT_CHOICE(MPEG_2_TS, "MPEG-2 transport stream"),
3341 DLT_CHOICE(NG40, "ng40 protocol tester Iub/Iur"),
3342 DLT_CHOICE(NFC_LLCP, "NFC LLCP PDUs with pseudo-header"),
3343 DLT_CHOICE(INFINIBAND, "InfiniBand"),
3344 DLT_CHOICE(SCTP, "SCTP"),
3345 DLT_CHOICE(USBPCAP, "USB with USBPcap header"),
3346 DLT_CHOICE(RTAC_SERIAL, "Schweitzer Engineering Laboratories RTAC packets"),
3347 DLT_CHOICE(BLUETOOTH_LE_LL, "Bluetooth Low Energy air interface"),
3348 DLT_CHOICE(NETLINK, "Linux netlink"),
3349 DLT_CHOICE(BLUETOOTH_LINUX_MONITOR, "Bluetooth Linux Monitor"),
3350 DLT_CHOICE(BLUETOOTH_BREDR_BB, "Bluetooth Basic Rate/Enhanced Data Rate baseband packets"),
3351 DLT_CHOICE(BLUETOOTH_LE_LL_WITH_PHDR, "Bluetooth Low Energy air interface with pseudo-header"),
3352 DLT_CHOICE(PROFIBUS_DL, "PROFIBUS data link layer"),
3353 DLT_CHOICE(PKTAP, "Apple DLT_PKTAP"),
3354 DLT_CHOICE(EPON, "Ethernet with 802.3 Clause 65 EPON preamble"),
3355 DLT_CHOICE(IPMI_HPM_2, "IPMI trace packets"),
3356 DLT_CHOICE(ZWAVE_R1_R2, "Z-Wave RF profile R1 and R2 packets"),
3357 DLT_CHOICE(ZWAVE_R3, "Z-Wave RF profile R3 packets"),
3358 DLT_CHOICE(WATTSTOPPER_DLM, "WattStopper Digital Lighting Management (DLM) and Legrand Nitoo Open protocol"),
3359 DLT_CHOICE(ISO_14443, "ISO 14443 messages"),
3360 DLT_CHOICE(RDS, "IEC 62106 Radio Data System groups"),
3361 DLT_CHOICE(USB_DARWIN, "USB with Darwin header"),
3362 DLT_CHOICE(OPENFLOW, "OpenBSD DLT_OPENFLOW"),
3363 DLT_CHOICE(SDLC, "IBM SDLC frames"),
3364 DLT_CHOICE(TI_LLN_SNIFFER, "TI LLN sniffer frames"),
3365 DLT_CHOICE(VSOCK, "Linux vsock"),
3366 DLT_CHOICE(NORDIC_BLE, "Nordic Semiconductor Bluetooth LE sniffer frames"),
3367 DLT_CHOICE(DOCSIS31_XRA31, "Excentis XRA-31 DOCSIS 3.1 RF sniffer frames"),
3368 DLT_CHOICE(ETHERNET_MPACKET, "802.3br mPackets"),
3369 DLT_CHOICE(DISPLAYPORT_AUX, "DisplayPort AUX channel monitoring data"),
3370 DLT_CHOICE(LINUX_SLL2, "Linux cooked v2"),
3371 DLT_CHOICE(OPENVIZSLA, "OpenVizsla USB"),
3372 DLT_CHOICE(EBHSCR, "Elektrobit High Speed Capture and Replay (EBHSCR)"),
3373 DLT_CHOICE(VPP_DISPATCH, "VPP graph dispatch tracer"),
3374 DLT_CHOICE(DSA_TAG_BRCM, "Broadcom tag"),
3375 DLT_CHOICE(DSA_TAG_BRCM_PREPEND, "Broadcom tag (prepended)"),
3376 DLT_CHOICE(IEEE802_15_4_TAP, "IEEE 802.15.4 with pseudo-header"),
3377 DLT_CHOICE(DSA_TAG_DSA, "Marvell DSA"),
3378 DLT_CHOICE(DSA_TAG_EDSA, "Marvell EDSA"),
3379 DLT_CHOICE(ELEE, "ELEE lawful intercept packets"),
3380 DLT_CHOICE(Z_WAVE_SERIAL, "Z-Wave serial frames between host and chip"),
3381 DLT_CHOICE(USB_2_0, "USB 2.0/1.1/1.0 as transmitted over the cable"),
3382 DLT_CHOICE(ATSC_ALP, "ATSC Link-Layer Protocol packets"),
3383 DLT_CHOICE_SENTINEL
3384 };
3385
3386 int
3387 pcap_datalink_name_to_val(const char *name)
3388 {
3389 int i;
3390
3391 for (i = 0; dlt_choices[i].name != NULL; i++) {
3392 if (pcapint_strcasecmp(dlt_choices[i].name, name) == 0)
3393 return (dlt_choices[i].dlt);
3394 }
3395 return (-1);
3396 }
3397
3398 const char *
3399 pcap_datalink_val_to_name(int dlt)
3400 {
3401 int i;
3402
3403 for (i = 0; dlt_choices[i].name != NULL; i++) {
3404 if (dlt_choices[i].dlt == dlt)
3405 return (dlt_choices[i].name);
3406 }
3407 return (NULL);
3408 }
3409
3410 const char *
3411 pcap_datalink_val_to_description(int dlt)
3412 {
3413 int i;
3414
3415 for (i = 0; dlt_choices[i].name != NULL; i++) {
3416 if (dlt_choices[i].dlt == dlt)
3417 return (dlt_choices[i].description);
3418 }
3419 return (NULL);
3420 }
3421
3422 const char *
3423 pcap_datalink_val_to_description_or_dlt(int dlt)
3424 {
3425 static thread_local char unkbuf[40];
3426 const char *description;
3427
3428 description = pcap_datalink_val_to_description(dlt);
3429 if (description != NULL) {
3430 return description;
3431 } else {
3432 (void)snprintf(unkbuf, sizeof(unkbuf), "DLT %d", dlt);
3433 return unkbuf;
3434 }
3435 }
3436
3437 struct tstamp_type_choice {
3438 const char *name;
3439 const char *description;
3440 int type;
3441 };
3442
3443 static struct tstamp_type_choice tstamp_type_choices[] = {
3444 { "host", "Host", PCAP_TSTAMP_HOST },
3445 { "host_lowprec", "Host, low precision", PCAP_TSTAMP_HOST_LOWPREC },
3446 { "host_hiprec", "Host, high precision", PCAP_TSTAMP_HOST_HIPREC },
3447 { "adapter", "Adapter", PCAP_TSTAMP_ADAPTER },
3448 { "adapter_unsynced", "Adapter, not synced with system time", PCAP_TSTAMP_ADAPTER_UNSYNCED },
3449 { "host_hiprec_unsynced", "Host, high precision, not synced with system time", PCAP_TSTAMP_HOST_HIPREC_UNSYNCED },
3450 { NULL, NULL, 0 }
3451 };
3452
3453 int
3454 pcap_tstamp_type_name_to_val(const char *name)
3455 {
3456 int i;
3457
3458 for (i = 0; tstamp_type_choices[i].name != NULL; i++) {
3459 if (pcapint_strcasecmp(tstamp_type_choices[i].name, name) == 0)
3460 return (tstamp_type_choices[i].type);
3461 }
3462 return (PCAP_ERROR);
3463 }
3464
3465 const char *
3466 pcap_tstamp_type_val_to_name(int tstamp_type)
3467 {
3468 int i;
3469
3470 for (i = 0; tstamp_type_choices[i].name != NULL; i++) {
3471 if (tstamp_type_choices[i].type == tstamp_type)
3472 return (tstamp_type_choices[i].name);
3473 }
3474 return (NULL);
3475 }
3476
3477 const char *
3478 pcap_tstamp_type_val_to_description(int tstamp_type)
3479 {
3480 int i;
3481
3482 for (i = 0; tstamp_type_choices[i].name != NULL; i++) {
3483 if (tstamp_type_choices[i].type == tstamp_type)
3484 return (tstamp_type_choices[i].description);
3485 }
3486 return (NULL);
3487 }
3488
3489 int
3490 pcap_snapshot(pcap_t *p)
3491 {
3492 if (!p->activated)
3493 return (PCAP_ERROR_NOT_ACTIVATED);
3494 return (p->snapshot);
3495 }
3496
3497 int
3498 pcap_is_swapped(pcap_t *p)
3499 {
3500 if (!p->activated)
3501 return (PCAP_ERROR_NOT_ACTIVATED);
3502 return (p->swapped);
3503 }
3504
3505 int
3506 pcap_major_version(pcap_t *p)
3507 {
3508 if (!p->activated)
3509 return (PCAP_ERROR_NOT_ACTIVATED);
3510 return (p->version_major);
3511 }
3512
3513 int
3514 pcap_minor_version(pcap_t *p)
3515 {
3516 if (!p->activated)
3517 return (PCAP_ERROR_NOT_ACTIVATED);
3518 return (p->version_minor);
3519 }
3520
3521 int
3522 pcap_bufsize(pcap_t *p)
3523 {
3524 if (!p->activated)
3525 return (PCAP_ERROR_NOT_ACTIVATED);
3526 return (p->bufsize);
3527 }
3528
3529 FILE *
3530 pcap_file(pcap_t *p)
3531 {
3532 return (p->rfile);
3533 }
3534
3535 #ifdef _WIN32
3536 int
3537 pcap_fileno(pcap_t *p)
3538 {
3539 if (p->handle != INVALID_HANDLE_VALUE) {
3540 /*
3541 * This is a bogus and now-deprecated API; we
3542 * squelch the narrowing warning for the cast
3543 * from HANDLE to intptr_t. If Windows programmers
3544 * need to get at the HANDLE for a pcap_t, *if*
3545 * there is one, they should request such a
3546 * routine (and be prepared for it to return
3547 * INVALID_HANDLE_VALUE).
3548 */
3549 DIAG_OFF_NARROWING
3550 return ((int)(intptr_t)p->handle);
3551 DIAG_ON_NARROWING
3552 } else
3553 return (PCAP_ERROR);
3554 }
3555 #else /* _WIN32 */
3556 int
3557 pcap_fileno(pcap_t *p)
3558 {
3559 return (p->fd);
3560 }
3561 #endif /* _WIN32 */
3562
3563 #if !defined(_WIN32) && !defined(MSDOS)
3564 int
3565 pcap_get_selectable_fd(pcap_t *p)
3566 {
3567 return (p->selectable_fd);
3568 }
3569
3570 const struct timeval *
3571 pcap_get_required_select_timeout(pcap_t *p)
3572 {
3573 return (p->required_select_timeout);
3574 }
3575 #endif
3576
3577 void
3578 pcap_perror(pcap_t *p, const char *prefix)
3579 {
3580 fprintf(stderr, "%s: %s\n", prefix, p->errbuf);
3581 }
3582
3583 char *
3584 pcap_geterr(pcap_t *p)
3585 {
3586 return (p->errbuf);
3587 }
3588
3589 int
3590 pcap_getnonblock(pcap_t *p, char *errbuf)
3591 {
3592 int ret;
3593
3594 ret = p->getnonblock_op(p);
3595 if (ret == -1) {
3596 /*
3597 * The get nonblock operation sets p->errbuf; this
3598 * function *shouldn't* have had a separate errbuf
3599 * argument, as it didn't need one, but I goofed
3600 * when adding it.
3601 *
3602 * We copy the error message to errbuf, so callers
3603 * can find it in either place.
3604 */
3605 pcapint_strlcpy(errbuf, p->errbuf, PCAP_ERRBUF_SIZE);
3606 }
3607 return (ret);
3608 }
3609
3610 /*
3611 * Get the current non-blocking mode setting, under the assumption that
3612 * it's just the standard POSIX non-blocking flag.
3613 */
3614 #if !defined(_WIN32) && !defined(MSDOS)
3615 int
3616 pcapint_getnonblock_fd(pcap_t *p)
3617 {
3618 int fdflags;
3619
3620 fdflags = fcntl(p->fd, F_GETFL, 0);
3621 if (fdflags == -1) {
3622 pcapint_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
3623 errno, "F_GETFL");
3624 return (-1);
3625 }
3626 if (fdflags & O_NONBLOCK)
3627 return (1);
3628 else
3629 return (0);
3630 }
3631 #endif
3632
3633 int
3634 pcap_setnonblock(pcap_t *p, int nonblock, char *errbuf)
3635 {
3636 int ret;
3637
3638 ret = p->setnonblock_op(p, nonblock);
3639 if (ret == -1) {
3640 /*
3641 * The set nonblock operation sets p->errbuf; this
3642 * function *shouldn't* have had a separate errbuf
3643 * argument, as it didn't need one, but I goofed
3644 * when adding it.
3645 *
3646 * We copy the error message to errbuf, so callers
3647 * can find it in either place.
3648 */
3649 pcapint_strlcpy(errbuf, p->errbuf, PCAP_ERRBUF_SIZE);
3650 }
3651 return (ret);
3652 }
3653
3654 #if !defined(_WIN32) && !defined(MSDOS)
3655 /*
3656 * Set non-blocking mode, under the assumption that it's just the
3657 * standard POSIX non-blocking flag. (This can be called by the
3658 * per-platform non-blocking-mode routine if that routine also
3659 * needs to do some additional work.)
3660 */
3661 int
3662 pcapint_setnonblock_fd(pcap_t *p, int nonblock)
3663 {
3664 int fdflags;
3665
3666 fdflags = fcntl(p->fd, F_GETFL, 0);
3667 if (fdflags == -1) {
3668 pcapint_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
3669 errno, "F_GETFL");
3670 return (-1);
3671 }
3672 if (nonblock)
3673 fdflags |= O_NONBLOCK;
3674 else
3675 fdflags &= ~O_NONBLOCK;
3676 if (fcntl(p->fd, F_SETFL, fdflags) == -1) {
3677 pcapint_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
3678 errno, "F_SETFL");
3679 return (-1);
3680 }
3681 return (0);
3682 }
3683 #endif
3684
3685 /*
3686 * Generate error strings for PCAP_ERROR_ and PCAP_WARNING_ values.
3687 */
3688 const char *
3689 pcap_statustostr(int errnum)
3690 {
3691 static thread_local char ebuf[15+10+1];
3692
3693 switch (errnum) {
3694
3695 case PCAP_WARNING:
3696 return("Generic warning");
3697
3698 case PCAP_WARNING_TSTAMP_TYPE_NOTSUP:
3699 return ("That type of time stamp is not supported by that device");
3700
3701 case PCAP_WARNING_PROMISC_NOTSUP:
3702 return ("That device doesn't support promiscuous mode");
3703
3704 case PCAP_ERROR:
3705 return("Generic error");
3706
3707 case PCAP_ERROR_BREAK:
3708 return("Loop terminated by pcap_breakloop");
3709
3710 case PCAP_ERROR_NOT_ACTIVATED:
3711 return("The pcap_t has not been activated");
3712
3713 case PCAP_ERROR_ACTIVATED:
3714 return ("The setting can't be changed after the pcap_t is activated");
3715
3716 case PCAP_ERROR_NO_SUCH_DEVICE:
3717 return ("No such device exists");
3718
3719 case PCAP_ERROR_RFMON_NOTSUP:
3720 return ("That device doesn't support monitor mode");
3721
3722 case PCAP_ERROR_NOT_RFMON:
3723 return ("That operation is supported only in monitor mode");
3724
3725 case PCAP_ERROR_PERM_DENIED:
3726 return ("You don't have permission to perform this capture on that device");
3727
3728 case PCAP_ERROR_IFACE_NOT_UP:
3729 return ("That device is not up");
3730
3731 case PCAP_ERROR_CANTSET_TSTAMP_TYPE:
3732 return ("That device doesn't support setting the time stamp type");
3733
3734 case PCAP_ERROR_PROMISC_PERM_DENIED:
3735 return ("You don't have permission to capture in promiscuous mode on that device");
3736
3737 case PCAP_ERROR_TSTAMP_PRECISION_NOTSUP:
3738 return ("That device doesn't support that time stamp precision");
3739
3740 case PCAP_ERROR_CAPTURE_NOTSUP:
3741 return ("Packet capture is not supported on that device");
3742 }
3743 (void)snprintf(ebuf, sizeof ebuf, "Unknown error: %d", errnum);
3744 return(ebuf);
3745 }
3746
3747 /*
3748 * A long time ago the purpose of this function was to hide the difference
3749 * between those Unix-like OSes that implemented strerror() and those that
3750 * didn't. All the currently supported OSes implement strerror(), which is in
3751 * POSIX.1-2001, uniformly and that particular problem no longer exists. But
3752 * now they implement a few incompatible thread-safe variants of strerror(),
3753 * and hiding that difference is the current purpose of this function.
3754 */
3755 const char *
3756 pcap_strerror(int errnum)
3757 {
3758 #ifdef _WIN32
3759 static thread_local char errbuf[PCAP_ERRBUF_SIZE];
3760 errno_t err = strerror_s(errbuf, PCAP_ERRBUF_SIZE, errnum);
3761
3762 if (err != 0) /* err = 0 if successful */
3763 pcapint_strlcpy(errbuf, "strerror_s() error", PCAP_ERRBUF_SIZE);
3764 return (errbuf);
3765 #elif defined(HAVE_GNU_STRERROR_R)
3766 /*
3767 * We have a GNU-style strerror_r(), which is *not* guaranteed to
3768 * do anything to the buffer handed to it, and which returns a
3769 * pointer to the error string, which may or may not be in
3770 * the buffer.
3771 *
3772 * It is, however, guaranteed to succeed.
3773 *
3774 * At the time of this writing this applies to the following cases,
3775 * each of which allows to use either the GNU implementation or the
3776 * POSIX implementation, and this source tree defines _GNU_SOURCE to
3777 * use the GNU implementation:
3778 * - Hurd
3779 * - Linux with GNU libc
3780 * - Linux with uClibc-ng
3781 */
3782 static thread_local char errbuf[PCAP_ERRBUF_SIZE];
3783 return strerror_r(errnum, errbuf, PCAP_ERRBUF_SIZE);
3784 #elif defined(HAVE_POSIX_STRERROR_R)
3785 /*
3786 * We have a POSIX-style strerror_r(), which is guaranteed to fill
3787 * in the buffer, but is not guaranteed to succeed.
3788 *
3789 * At the time of this writing this applies to the following cases:
3790 * - AIX 7
3791 * - FreeBSD
3792 * - Haiku
3793 * - HP-UX 11
3794 * - illumos
3795 * - Linux with musl libc
3796 * - macOS
3797 * - NetBSD
3798 * - OpenBSD
3799 * - Solaris 10 & 11
3800 */
3801 static thread_local char errbuf[PCAP_ERRBUF_SIZE];
3802 int err = strerror_r(errnum, errbuf, PCAP_ERRBUF_SIZE);
3803 switch (err) {
3804 case 0:
3805 /* That worked. */
3806 break;
3807
3808 case EINVAL:
3809 /*
3810 * UNIX 03 says this isn't guaranteed to produce a
3811 * fallback error message.
3812 */
3813 snprintf(errbuf, PCAP_ERRBUF_SIZE,
3814 "Unknown error: %d", errnum);
3815 break;
3816 case ERANGE:
3817 /*
3818 * UNIX 03 says this isn't guaranteed to produce a
3819 * fallback error message.
3820 */
3821 snprintf(errbuf, PCAP_ERRBUF_SIZE,
3822 "Message for error %d is too long", errnum);
3823 break;
3824 default:
3825 snprintf(errbuf, PCAP_ERRBUF_SIZE,
3826 "strerror_r(%d, ...) unexpectedly returned %d",
3827 errnum, err);
3828 }
3829 return errbuf;
3830 #else
3831 /*
3832 * At the time of this writing every supported OS implements strerror()
3833 * and at least one thread-safe variant thereof, so this is a very
3834 * unlikely last-resort branch. Particular implementations of strerror()
3835 * may be thread-safe, but this is neither required nor guaranteed.
3836 */
3837 return (strerror(errnum));
3838 #endif /* _WIN32 */
3839 }
3840
3841 int
3842 pcap_setfilter(pcap_t *p, struct bpf_program *fp)
3843 {
3844 return (p->setfilter_op(p, fp));
3845 }
3846
3847 /*
3848 * Set direction flag, which controls whether we accept only incoming
3849 * packets, only outgoing packets, or both.
3850 * Note that, depending on the platform, some or all direction arguments
3851 * might not be supported.
3852 */
3853 int
3854 pcap_setdirection(pcap_t *p, pcap_direction_t d)
3855 {
3856 if (p->setdirection_op == NULL) {
3857 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
3858 "Setting direction is not supported on this device");
3859 return (-1);
3860 } else {
3861 switch (d) {
3862
3863 case PCAP_D_IN:
3864 case PCAP_D_OUT:
3865 case PCAP_D_INOUT:
3866 /*
3867 * Valid direction.
3868 */
3869 return (p->setdirection_op(p, d));
3870
3871 default:
3872 /*
3873 * Invalid direction.
3874 */
3875 snprintf(p->errbuf, sizeof(p->errbuf),
3876 "Invalid direction");
3877 return (-1);
3878 }
3879 }
3880 }
3881
3882 int
3883 pcap_stats(pcap_t *p, struct pcap_stat *ps)
3884 {
3885 return (p->stats_op(p, ps));
3886 }
3887
3888 #ifdef _WIN32
3889 struct pcap_stat *
3890 pcap_stats_ex(pcap_t *p, int *pcap_stat_size)
3891 {
3892 return (p->stats_ex_op(p, pcap_stat_size));
3893 }
3894
3895 int
3896 pcap_setbuff(pcap_t *p, int dim)
3897 {
3898 return (p->setbuff_op(p, dim));
3899 }
3900
3901 int
3902 pcap_setmode(pcap_t *p, int mode)
3903 {
3904 return (p->setmode_op(p, mode));
3905 }
3906
3907 int
3908 pcap_setmintocopy(pcap_t *p, int size)
3909 {
3910 return (p->setmintocopy_op(p, size));
3911 }
3912
3913 HANDLE
3914 pcap_getevent(pcap_t *p)
3915 {
3916 return (p->getevent_op(p));
3917 }
3918
3919 int
3920 pcap_oid_get_request(pcap_t *p, bpf_u_int32 oid, void *data, size_t *lenp)
3921 {
3922 return (p->oid_get_request_op(p, oid, data, lenp));
3923 }
3924
3925 int
3926 pcap_oid_set_request(pcap_t *p, bpf_u_int32 oid, const void *data, size_t *lenp)
3927 {
3928 return (p->oid_set_request_op(p, oid, data, lenp));
3929 }
3930
3931 pcap_send_queue *
3932 pcap_sendqueue_alloc(u_int memsize)
3933 {
3934 pcap_send_queue *tqueue;
3935
3936 /* Allocate the queue */
3937 tqueue = (pcap_send_queue *)malloc(sizeof(pcap_send_queue));
3938 if (tqueue == NULL){
3939 return (NULL);
3940 }
3941
3942 /* Allocate the buffer */
3943 tqueue->buffer = (char *)malloc(memsize);
3944 if (tqueue->buffer == NULL) {
3945 free(tqueue);
3946 return (NULL);
3947 }
3948
3949 tqueue->maxlen = memsize;
3950 tqueue->len = 0;
3951
3952 return (tqueue);
3953 }
3954
3955 void
3956 pcap_sendqueue_destroy(pcap_send_queue *queue)
3957 {
3958 free(queue->buffer);
3959 free(queue);
3960 }
3961
3962 int
3963 pcap_sendqueue_queue(pcap_send_queue *queue, const struct pcap_pkthdr *pkt_header, const u_char *pkt_data)
3964 {
3965 if (queue->len + sizeof(struct pcap_pkthdr) + pkt_header->caplen > queue->maxlen){
3966 return (-1);
3967 }
3968
3969 /* Copy the pcap_pkthdr header*/
3970 memcpy(queue->buffer + queue->len, pkt_header, sizeof(struct pcap_pkthdr));
3971 queue->len += sizeof(struct pcap_pkthdr);
3972
3973 /* copy the packet */
3974 memcpy(queue->buffer + queue->len, pkt_data, pkt_header->caplen);
3975 queue->len += pkt_header->caplen;
3976
3977 return (0);
3978 }
3979
3980 u_int
3981 pcap_sendqueue_transmit(pcap_t *p, pcap_send_queue *queue, int sync)
3982 {
3983 return (p->sendqueue_transmit_op(p, queue, sync));
3984 }
3985
3986 int
3987 pcap_setuserbuffer(pcap_t *p, int size)
3988 {
3989 return (p->setuserbuffer_op(p, size));
3990 }
3991
3992 int
3993 pcap_live_dump(pcap_t *p, char *filename, int maxsize, int maxpacks)
3994 {
3995 return (p->live_dump_op(p, filename, maxsize, maxpacks));
3996 }
3997
3998 int
3999 pcap_live_dump_ended(pcap_t *p, int sync)
4000 {
4001 return (p->live_dump_ended_op(p, sync));
4002 }
4003
4004 PAirpcapHandle
4005 pcap_get_airpcap_handle(pcap_t *p)
4006 {
4007 PAirpcapHandle handle;
4008
4009 handle = p->get_airpcap_handle_op(p);
4010 if (handle == NULL) {
4011 (void)snprintf(p->errbuf, sizeof(p->errbuf),
4012 "This isn't an AirPcap device");
4013 }
4014 return (handle);
4015 }
4016 #endif
4017
4018 /*
4019 * On some platforms, we need to clean up promiscuous or monitor mode
4020 * when we close a device - and we want that to happen even if the
4021 * application just exits without explicitly closing devices.
4022 * On those platforms, we need to register a "close all the pcaps"
4023 * routine to be called when we exit, and need to maintain a list of
4024 * pcaps that need to be closed to clean up modes.
4025 *
4026 * XXX - not thread-safe.
4027 */
4028
4029 /*
4030 * List of pcaps on which we've done something that needs to be
4031 * cleaned up.
4032 * If there are any such pcaps, we arrange to call "pcap_close_all()"
4033 * when we exit, and have it close all of them.
4034 */
4035 static struct pcap *pcaps_to_close;
4036
4037 /*
4038 * TRUE if we've already called "atexit()" to cause "pcap_close_all()" to
4039 * be called on exit.
4040 */
4041 static int did_atexit;
4042
4043 static void
4044 pcap_close_all(void)
4045 {
4046 struct pcap *handle;
4047
4048 while ((handle = pcaps_to_close) != NULL) {
4049 pcap_close(handle);
4050
4051 /*
4052 * If a pcap module adds a pcap_t to the "close all"
4053 * list by calling pcapint_add_to_pcaps_to_close(), it
4054 * must have a cleanup routine that removes it from the
4055 * list, by calling pcapint_remove_from_pcaps_to_close(),
4056 * and must make that cleanup routine the cleanup_op
4057 * for the pcap_t.
4058 *
4059 * That means that, after pcap_close() - which calls
4060 * the cleanup_op for the pcap_t - the pcap_t must
4061 * have been removed from the list, so pcaps_to_close
4062 * must not be equal to handle.
4063 *
4064 * We check for that, and abort if handle is still
4065 * at the head of the list, to prevent infinite loops.
4066 */
4067 if (pcaps_to_close == handle)
4068 abort();
4069 }
4070 }
4071
4072 int
4073 pcapint_do_addexit(pcap_t *p)
4074 {
4075 /*
4076 * If we haven't already done so, arrange to have
4077 * "pcap_close_all()" called when we exit.
4078 */
4079 if (!did_atexit) {
4080 if (atexit(pcap_close_all) != 0) {
4081 /*
4082 * "atexit()" failed; let our caller know.
4083 */
4084 pcapint_strlcpy(p->errbuf, "atexit failed", PCAP_ERRBUF_SIZE);
4085 return (0);
4086 }
4087 did_atexit = 1;
4088 }
4089 return (1);
4090 }
4091
4092 void
4093 pcapint_add_to_pcaps_to_close(pcap_t *p)
4094 {
4095 p->next = pcaps_to_close;
4096 pcaps_to_close = p;
4097 }
4098
4099 void
4100 pcapint_remove_from_pcaps_to_close(pcap_t *p)
4101 {
4102 pcap_t *pc, *prevpc;
4103
4104 for (pc = pcaps_to_close, prevpc = NULL; pc != NULL;
4105 prevpc = pc, pc = pc->next) {
4106 if (pc == p) {
4107 /*
4108 * Found it. Remove it from the list.
4109 */
4110 if (prevpc == NULL) {
4111 /*
4112 * It was at the head of the list.
4113 */
4114 pcaps_to_close = pc->next;
4115 } else {
4116 /*
4117 * It was in the middle of the list.
4118 */
4119 prevpc->next = pc->next;
4120 }
4121 break;
4122 }
4123 }
4124 }
4125
4126 void
4127 pcapint_breakloop_common(pcap_t *p)
4128 {
4129 p->break_loop = 1;
4130 }
4131
4132
4133 void
4134 pcapint_cleanup_live_common(pcap_t *p)
4135 {
4136 if (p->opt.device != NULL) {
4137 free(p->opt.device);
4138 p->opt.device = NULL;
4139 }
4140 if (p->buffer != NULL) {
4141 free(p->buffer);
4142 p->buffer = NULL;
4143 }
4144 if (p->dlt_list != NULL) {
4145 free(p->dlt_list);
4146 p->dlt_list = NULL;
4147 p->dlt_count = 0;
4148 }
4149 if (p->tstamp_type_list != NULL) {
4150 free(p->tstamp_type_list);
4151 p->tstamp_type_list = NULL;
4152 p->tstamp_type_count = 0;
4153 }
4154 if (p->tstamp_precision_list != NULL) {
4155 free(p->tstamp_precision_list);
4156 p->tstamp_precision_list = NULL;
4157 p->tstamp_precision_count = 0;
4158 }
4159 pcap_freecode(&p->fcode);
4160 #if !defined(_WIN32) && !defined(MSDOS)
4161 if (p->fd >= 0) {
4162 close(p->fd);
4163 p->fd = -1;
4164 }
4165 p->selectable_fd = -1;
4166 #endif
4167 }
4168
4169 /*
4170 * API compatible with WinPcap's "send a packet" routine - returns -1
4171 * on error, 0 otherwise.
4172 *
4173 * XXX - what if we get a short write?
4174 */
4175 int
4176 pcap_sendpacket(pcap_t *p, const u_char *buf, int size)
4177 {
4178 if (size <= 0) {
4179 pcapint_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
4180 errno, "The number of bytes to be sent must be positive");
4181 return (PCAP_ERROR);
4182 }
4183
4184 if (p->inject_op(p, buf, size) == -1)
4185 return (-1);
4186 return (0);
4187 }
4188
4189 /*
4190 * API compatible with OpenBSD's "send a packet" routine - returns -1 on
4191 * error, number of bytes written otherwise.
4192 */
4193 int
4194 pcap_inject(pcap_t *p, const void *buf, size_t size)
4195 {
4196 /*
4197 * We return the number of bytes written, so the number of
4198 * bytes to write must fit in an int.
4199 */
4200 if (size > INT_MAX) {
4201 pcapint_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
4202 errno, "More than %d bytes cannot be injected", INT_MAX);
4203 return (PCAP_ERROR);
4204 }
4205
4206 if (size == 0) {
4207 pcapint_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
4208 errno, "The number of bytes to be injected must not be zero");
4209 return (PCAP_ERROR);
4210 }
4211
4212 return (p->inject_op(p, buf, size));
4213 }
4214
4215 void
4216 pcap_close(pcap_t *p)
4217 {
4218 p->cleanup_op(p);
4219 free(p);
4220 }
4221
4222 /*
4223 * Helpers for safely loading code at run time.
4224 * Currently Windows-only.
4225 */
4226 #ifdef _WIN32
4227 //
4228 // This wrapper around loadlibrary appends the system folder (usually
4229 // C:\Windows\System32) to the relative path of the DLL, so that the DLL
4230 // is always loaded from an absolute path (it's no longer possible to
4231 // load modules from the application folder).
4232 // This solves the DLL Hijacking issue discovered in August 2010:
4233 //
4234 // https://blog.rapid7.com/2010/08/23/exploiting-dll-hijacking-flaws/
4235 // https://blog.rapid7.com/2010/08/23/application-dll-load-hijacking/
4236 // (the purported Rapid7 blog post link in the first of those two links
4237 // is broken; the second of those links works.)
4238 //
4239 // If any links there are broken from all the content shuffling Rapid&
4240 // did, see archived versions of the posts at their original homes, at
4241 //
4242 // https://web.archive.org/web/20110122175058/http://blog.metasploit.com/2010/08/exploiting-dll-hijacking-flaws.html
4243 // https://web.archive.org/web/20100828112111/http://blog.rapid7.com/?p=5325
4244 //
4245 pcap_code_handle_t
4246 pcapint_load_code(const char *name)
4247 {
4248 /*
4249 * XXX - should this work in UTF-16LE rather than in the local
4250 * ANSI code page?
4251 */
4252 CHAR path[MAX_PATH];
4253 CHAR fullFileName[MAX_PATH];
4254 UINT res;
4255 HMODULE hModule = NULL;
4256
4257 do
4258 {
4259 res = GetSystemDirectoryA(path, MAX_PATH);
4260
4261 if (res == 0) {
4262 //
4263 // some bad failure occurred;
4264 //
4265 break;
4266 }
4267
4268 if (res > MAX_PATH) {
4269 //
4270 // the buffer was not big enough
4271 //
4272 SetLastError(ERROR_INSUFFICIENT_BUFFER);
4273 break;
4274 }
4275
4276 if (res + 1 + strlen(name) + 1 < MAX_PATH) {
4277 memcpy(fullFileName, path, res * sizeof(TCHAR));
4278 fullFileName[res] = '\\';
4279 memcpy(&fullFileName[res + 1], name, (strlen(name) + 1) * sizeof(TCHAR));
4280
4281 hModule = LoadLibraryA(fullFileName);
4282 } else
4283 SetLastError(ERROR_INSUFFICIENT_BUFFER);
4284
4285 } while(FALSE);
4286
4287 return hModule;
4288 }
4289
4290 pcap_funcptr_t
4291 pcapint_find_function(pcap_code_handle_t code, const char *func)
4292 {
4293 return (GetProcAddress(code, func));
4294 }
4295 #endif
4296
4297 /*
4298 * Given a BPF program, a pcap_pkthdr structure for a packet, and the raw
4299 * data for the packet, check whether the packet passes the filter.
4300 * Returns the return value of the filter program, which will be zero if
4301 * the packet doesn't pass and non-zero if the packet does pass.
4302 */
4303 int
4304 pcap_offline_filter(const struct bpf_program *fp, const struct pcap_pkthdr *h,
4305 const u_char *pkt)
4306 {
4307 const struct bpf_insn *fcode = fp->bf_insns;
4308
4309 if (fcode != NULL)
4310 return (pcapint_filter(fcode, pkt, h->len, h->caplen));
4311 else
4312 return (0);
4313 }
4314
4315 static int
4316 pcap_can_set_rfmon_dead(pcap_t *p)
4317 {
4318 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
4319 "Rfmon mode doesn't apply on a pcap_open_dead pcap_t");
4320 return (PCAP_ERROR);
4321 }
4322
4323 static int
4324 pcap_read_dead(pcap_t *p, int cnt _U_, pcap_handler callback _U_,
4325 u_char *user _U_)
4326 {
4327 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
4328 "Packets aren't available from a pcap_open_dead pcap_t");
4329 return (-1);
4330 }
4331
4332 static void
4333 pcap_breakloop_dead(pcap_t *p _U_)
4334 {
4335 /*
4336 * A "dead" pcap_t is just a placeholder to use in order to
4337 * compile a filter to BPF code or to open a savefile for
4338 * writing. It doesn't support any operations, including
4339 * capturing or reading packets, so there will never be a
4340 * get-packets loop in progress to break out *of*.
4341 *
4342 * As such, this routine doesn't need to do anything.
4343 */
4344 }
4345
4346 static int
4347 pcap_inject_dead(pcap_t *p, const void *buf _U_, size_t size _U_)
4348 {
4349 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
4350 "Packets can't be sent on a pcap_open_dead pcap_t");
4351 return (-1);
4352 }
4353
4354 static int
4355 pcap_setfilter_dead(pcap_t *p, struct bpf_program *fp _U_)
4356 {
4357 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
4358 "A filter cannot be set on a pcap_open_dead pcap_t");
4359 return (-1);
4360 }
4361
4362 static int
4363 pcap_setdirection_dead(pcap_t *p, pcap_direction_t d _U_)
4364 {
4365 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
4366 "The packet direction cannot be set on a pcap_open_dead pcap_t");
4367 return (-1);
4368 }
4369
4370 static int
4371 pcap_set_datalink_dead(pcap_t *p, int dlt _U_)
4372 {
4373 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
4374 "The link-layer header type cannot be set on a pcap_open_dead pcap_t");
4375 return (-1);
4376 }
4377
4378 static int
4379 pcap_getnonblock_dead(pcap_t *p)
4380 {
4381 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
4382 "A pcap_open_dead pcap_t does not have a non-blocking mode setting");
4383 return (-1);
4384 }
4385
4386 static int
4387 pcap_setnonblock_dead(pcap_t *p, int nonblock _U_)
4388 {
4389 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
4390 "A pcap_open_dead pcap_t does not have a non-blocking mode setting");
4391 return (-1);
4392 }
4393
4394 static int
4395 pcap_stats_dead(pcap_t *p, struct pcap_stat *ps _U_)
4396 {
4397 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
4398 "Statistics aren't available from a pcap_open_dead pcap_t");
4399 return (-1);
4400 }
4401
4402 #ifdef _WIN32
4403 static struct pcap_stat *
4404 pcap_stats_ex_dead(pcap_t *p, int *pcap_stat_size _U_)
4405 {
4406 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
4407 "Statistics aren't available from a pcap_open_dead pcap_t");
4408 return (NULL);
4409 }
4410
4411 static int
4412 pcap_setbuff_dead(pcap_t *p, int dim _U_)
4413 {
4414 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
4415 "The kernel buffer size cannot be set on a pcap_open_dead pcap_t");
4416 return (-1);
4417 }
4418
4419 static int
4420 pcap_setmode_dead(pcap_t *p, int mode _U_)
4421 {
4422 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
4423 "impossible to set mode on a pcap_open_dead pcap_t");
4424 return (-1);
4425 }
4426
4427 static int
4428 pcap_setmintocopy_dead(pcap_t *p, int size _U_)
4429 {
4430 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
4431 "The mintocopy parameter cannot be set on a pcap_open_dead pcap_t");
4432 return (-1);
4433 }
4434
4435 static HANDLE
4436 pcap_getevent_dead(pcap_t *p)
4437 {
4438 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
4439 "A pcap_open_dead pcap_t has no event handle");
4440 return (INVALID_HANDLE_VALUE);
4441 }
4442
4443 static int
4444 pcap_oid_get_request_dead(pcap_t *p, bpf_u_int32 oid _U_, void *data _U_,
4445 size_t *lenp _U_)
4446 {
4447 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
4448 "An OID get request cannot be performed on a pcap_open_dead pcap_t");
4449 return (PCAP_ERROR);
4450 }
4451
4452 static int
4453 pcap_oid_set_request_dead(pcap_t *p, bpf_u_int32 oid _U_, const void *data _U_,
4454 size_t *lenp _U_)
4455 {
4456 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
4457 "An OID set request cannot be performed on a pcap_open_dead pcap_t");
4458 return (PCAP_ERROR);
4459 }
4460
4461 static u_int
4462 pcap_sendqueue_transmit_dead(pcap_t *p, pcap_send_queue *queue _U_,
4463 int sync _U_)
4464 {
4465 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
4466 "Packets cannot be transmitted on a pcap_open_dead pcap_t");
4467 return (0);
4468 }
4469
4470 static int
4471 pcap_setuserbuffer_dead(pcap_t *p, int size _U_)
4472 {
4473 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
4474 "The user buffer cannot be set on a pcap_open_dead pcap_t");
4475 return (-1);
4476 }
4477
4478 static int
4479 pcap_live_dump_dead(pcap_t *p, char *filename _U_, int maxsize _U_,
4480 int maxpacks _U_)
4481 {
4482 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
4483 "Live packet dumping cannot be performed on a pcap_open_dead pcap_t");
4484 return (-1);
4485 }
4486
4487 static int
4488 pcap_live_dump_ended_dead(pcap_t *p, int sync _U_)
4489 {
4490 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
4491 "Live packet dumping cannot be performed on a pcap_open_dead pcap_t");
4492 return (-1);
4493 }
4494
4495 static PAirpcapHandle
4496 pcap_get_airpcap_handle_dead(pcap_t *p _U_)
4497 {
4498 return (NULL);
4499 }
4500 #endif /* _WIN32 */
4501
4502 static void
4503 pcap_cleanup_dead(pcap_t *p _U_)
4504 {
4505 /* Nothing to do. */
4506 }
4507
4508 pcap_t *
4509 pcap_open_dead_with_tstamp_precision(int linktype, int snaplen, u_int precision)
4510 {
4511 pcap_t *p;
4512
4513 switch (precision) {
4514
4515 case PCAP_TSTAMP_PRECISION_MICRO:
4516 case PCAP_TSTAMP_PRECISION_NANO:
4517 break;
4518
4519 default:
4520 /*
4521 * This doesn't really matter, but we don't have any way
4522 * to report particular errors, so the only failure we
4523 * should have is a memory allocation failure. Just
4524 * pick microsecond precision.
4525 */
4526 precision = PCAP_TSTAMP_PRECISION_MICRO;
4527 break;
4528 }
4529 p = malloc(sizeof(*p));
4530 if (p == NULL)
4531 return NULL;
4532 memset (p, 0, sizeof(*p));
4533 p->snapshot = snaplen;
4534 p->linktype = linktype;
4535 p->opt.tstamp_precision = precision;
4536 p->can_set_rfmon_op = pcap_can_set_rfmon_dead;
4537 p->read_op = pcap_read_dead;
4538 p->inject_op = pcap_inject_dead;
4539 p->setfilter_op = pcap_setfilter_dead;
4540 p->setdirection_op = pcap_setdirection_dead;
4541 p->set_datalink_op = pcap_set_datalink_dead;
4542 p->getnonblock_op = pcap_getnonblock_dead;
4543 p->setnonblock_op = pcap_setnonblock_dead;
4544 p->stats_op = pcap_stats_dead;
4545 #ifdef _WIN32
4546 p->stats_ex_op = pcap_stats_ex_dead;
4547 p->setbuff_op = pcap_setbuff_dead;
4548 p->setmode_op = pcap_setmode_dead;
4549 p->setmintocopy_op = pcap_setmintocopy_dead;
4550 p->getevent_op = pcap_getevent_dead;
4551 p->oid_get_request_op = pcap_oid_get_request_dead;
4552 p->oid_set_request_op = pcap_oid_set_request_dead;
4553 p->sendqueue_transmit_op = pcap_sendqueue_transmit_dead;
4554 p->setuserbuffer_op = pcap_setuserbuffer_dead;
4555 p->live_dump_op = pcap_live_dump_dead;
4556 p->live_dump_ended_op = pcap_live_dump_ended_dead;
4557 p->get_airpcap_handle_op = pcap_get_airpcap_handle_dead;
4558 #endif
4559 p->breakloop_op = pcap_breakloop_dead;
4560 p->cleanup_op = pcap_cleanup_dead;
4561
4562 /*
4563 * A "dead" pcap_t never requires special BPF code generation.
4564 */
4565 p->bpf_codegen_flags = 0;
4566
4567 p->activated = 1;
4568 return (p);
4569 }
4570
4571 pcap_t *
4572 pcap_open_dead(int linktype, int snaplen)
4573 {
4574 return (pcap_open_dead_with_tstamp_precision(linktype, snaplen,
4575 PCAP_TSTAMP_PRECISION_MICRO));
4576 }
4577
4578 #ifdef YYDEBUG
4579 /*
4580 * Set the internal "debug printout" flag for the filter expression parser.
4581 * The code to print that stuff is present only if YYDEBUG is defined, so
4582 * the flag, and the routine to set it, are defined only if YYDEBUG is
4583 * defined.
4584 *
4585 * This is intended for libpcap developers, not for general use.
4586 * If you want to set these in a program, you'll have to declare this
4587 * routine yourself, with the appropriate DLL import attribute on Windows;
4588 * it's not declared in any header file, and won't be declared in any
4589 * header file provided by libpcap.
4590 */
4591 PCAP_API void pcap_set_parser_debug(int value);
4592
4593 PCAP_API_DEF void
4594 pcap_set_parser_debug(int value)
4595 {
4596 pcap_debug = value;
4597 }
4598 #endif
4599