xref: /dragonfly/contrib/libpcap/pcap.c (revision ea16f64e)
1 /*
2  * Copyright (c) 1993, 1994, 1995, 1996, 1997, 1998
3  *	The Regents of the University of California.  All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  * 3. All advertising materials mentioning features or use of this software
14  *    must display the following acknowledgement:
15  *	This product includes software developed by the Computer Systems
16  *	Engineering Group at Lawrence Berkeley Laboratory.
17  * 4. Neither the name of the University nor of the Laboratory may be used
18  *    to endorse or promote products derived from this software without
19  *    specific prior written permission.
20  *
21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31  * SUCH DAMAGE.
32  */
33 
34 #ifdef HAVE_CONFIG_H
35 #include <config.h>
36 #endif
37 
38 #include <pcap-types.h>
39 #ifndef _WIN32
40 #include <sys/param.h>
41 #ifndef MSDOS
42 #include <sys/file.h>
43 #endif
44 #include <sys/ioctl.h>
45 #include <sys/socket.h>
46 #ifdef HAVE_SYS_SOCKIO_H
47 #include <sys/sockio.h>
48 #endif
49 
50 struct mbuf;		/* Squelch compiler warnings on some platforms for */
51 struct rtentry;		/* declarations in <net/if.h> */
52 #include <net/if.h>
53 #include <netinet/in.h>
54 #endif /* _WIN32 */
55 
56 #include <stdio.h>
57 #include <stdlib.h>
58 #include <string.h>
59 #if !defined(_MSC_VER) && !defined(__BORLANDC__) && !defined(__MINGW32__)
60 #include <unistd.h>
61 #endif
62 #include <fcntl.h>
63 #include <errno.h>
64 #include <limits.h>
65 
66 #include "diag-control.h"
67 
68 #ifdef HAVE_OS_PROTO_H
69 #include "os-proto.h"
70 #endif
71 
72 #ifdef MSDOS
73 #include "pcap-dos.h"
74 #endif
75 
76 #include "pcap-int.h"
77 
78 #include "optimize.h"
79 
80 #ifdef HAVE_DAG_API
81 #include "pcap-dag.h"
82 #endif /* HAVE_DAG_API */
83 
84 #ifdef HAVE_SEPTEL_API
85 #include "pcap-septel.h"
86 #endif /* HAVE_SEPTEL_API */
87 
88 #ifdef HAVE_SNF_API
89 #include "pcap-snf.h"
90 #endif /* HAVE_SNF_API */
91 
92 #ifdef HAVE_TC_API
93 #include "pcap-tc.h"
94 #endif /* HAVE_TC_API */
95 
96 #ifdef PCAP_SUPPORT_LINUX_USBMON
97 #include "pcap-usb-linux.h"
98 #endif
99 
100 #ifdef PCAP_SUPPORT_BT
101 #include "pcap-bt-linux.h"
102 #endif
103 
104 #ifdef PCAP_SUPPORT_BT_MONITOR
105 #include "pcap-bt-monitor-linux.h"
106 #endif
107 
108 #ifdef PCAP_SUPPORT_NETFILTER
109 #include "pcap-netfilter-linux.h"
110 #endif
111 
112 #ifdef PCAP_SUPPORT_NETMAP
113 #include "pcap-netmap.h"
114 #endif
115 
116 #ifdef PCAP_SUPPORT_DBUS
117 #include "pcap-dbus.h"
118 #endif
119 
120 #ifdef PCAP_SUPPORT_RDMASNIFF
121 #include "pcap-rdmasniff.h"
122 #endif
123 
124 #ifdef PCAP_SUPPORT_DPDK
125 #include "pcap-dpdk.h"
126 #endif
127 
128 #ifdef HAVE_AIRPCAP_API
129 #include "pcap-airpcap.h"
130 #endif
131 
132 #ifdef _WIN32
133 /*
134  * DllMain(), required when built as a Windows DLL.
135  *
136  * To quote the WSAStartup() documentation:
137  *
138  *   The WSAStartup function typically leads to protocol-specific helper
139  *   DLLs being loaded. As a result, the WSAStartup function should not
140  *   be called from the DllMain function in a application DLL. This can
141  *   potentially cause deadlocks.
142  *
143  * and the WSACleanup() documentation:
144  *
145  *   The WSACleanup function typically leads to protocol-specific helper
146  *   DLLs being unloaded. As a result, the WSACleanup function should not
147  *   be called from the DllMain function in a application DLL. This can
148  *   potentially cause deadlocks.
149  *
150  * So we don't initialize Winsock here.  pcap_init() should be called
151  * to initialize pcap on both UN*X and Windows; it will initialize
152  * Winsock on Windows.  (It will also be initialized as needed if
153  * pcap_init() hasn't been called.)
154  */
DllMain(HANDLE hinstDLL _U_,DWORD dwReason _U_,LPVOID lpvReserved _U_)155 BOOL WINAPI DllMain(
156   HANDLE hinstDLL _U_,
157   DWORD dwReason _U_,
158   LPVOID lpvReserved _U_
159 )
160 {
161 	return (TRUE);
162 }
163 
164 /*
165  * Start Winsock.
166  * Internal routine.
167  */
168 static int
internal_wsockinit(char * errbuf)169 internal_wsockinit(char *errbuf)
170 {
171 	WORD wVersionRequested;
172 	WSADATA wsaData;
173 	static int err = -1;
174 	static int done = 0;
175 	int status;
176 
177 	if (done)
178 		return (err);
179 
180 	/*
181 	 * Versions of Windows that don't support Winsock 2.2 are
182 	 * too old for us.
183 	 */
184 	wVersionRequested = MAKEWORD(2, 2);
185 	status = WSAStartup(wVersionRequested, &wsaData);
186 	done = 1;
187 	if (status != 0) {
188 		if (errbuf != NULL) {
189 			pcap_fmt_errmsg_for_win32_err(errbuf, PCAP_ERRBUF_SIZE,
190 			    status, "WSAStartup() failed");
191 		}
192 		return (err);
193 	}
194 	atexit ((void(*)(void))WSACleanup);
195 	err = 0;
196 	return (err);
197 }
198 
199 /*
200  * Exported in case some applications using WinPcap/Npcap called it,
201  * even though it wasn't exported.
202  */
203 int
wsockinit(void)204 wsockinit(void)
205 {
206 	return (internal_wsockinit(NULL));
207 }
208 
209 /*
210  * This is the exported function; new programs should call this.
211  * *Newer* programs should call pcap_init().
212  */
213 int
pcap_wsockinit(void)214 pcap_wsockinit(void)
215 {
216 	return (internal_wsockinit(NULL));
217 }
218 #endif /* _WIN32 */
219 
220 /*
221  * Do whatever initialization is needed for libpcap.
222  *
223  * The argument specifies whether we use the local code page or UTF-8
224  * for strings; on UN*X, we just assume UTF-8 in places where the encoding
225  * would matter, whereas, on Windows, we use the local code page for
226  * PCAP_CHAR_ENC_LOCAL and UTF-8 for PCAP_CHAR_ENC_UTF_8.
227  *
228  * On Windows, we also disable the hack in pcap_create() to deal with
229  * being handed UTF-16 strings, because if the user calls this they're
230  * explicitly declaring that they will either be passing local code
231  * page strings or UTF-8 strings, so we don't need to allow UTF-16LE
232  * strings to be passed.  For good measure, on Windows *and* UN*X,
233  * we disable pcap_lookupdev(), to prevent anybody from even
234  * *trying* to pass the result of pcap_lookupdev() - which might be
235  * UTF-16LE on Windows, for ugly compatibility reasons - to pcap_create()
236  * or pcap_open_live() or pcap_open().
237  *
238  * Returns 0 on success, -1 on error.
239  */
240 int pcap_new_api;		/* pcap_lookupdev() always fails */
241 int pcap_utf_8_mode;		/* Strings should be in UTF-8. */
242 
243 int
pcap_init(unsigned int opts,char * errbuf)244 pcap_init(unsigned int opts, char *errbuf)
245 {
246 	static int initialized;
247 
248 	/*
249 	 * Don't allow multiple calls that set different modes; that
250 	 * may mean a library is initializing pcap in one mode and
251 	 * a program using that library, or another library used by
252 	 * that program, is initializing it in another mode.
253 	 */
254 	switch (opts) {
255 
256 	case PCAP_CHAR_ENC_LOCAL:
257 		/* Leave "UTF-8 mode" off. */
258 		if (initialized) {
259 			if (pcap_utf_8_mode) {
260 				snprintf(errbuf, PCAP_ERRBUF_SIZE,
261 				    "Multiple pcap_init calls with different character encodings");
262 				return (-1);
263 			}
264 		}
265 		break;
266 
267 	case PCAP_CHAR_ENC_UTF_8:
268 		/* Turn on "UTF-8 mode". */
269 		if (initialized) {
270 			if (!pcap_utf_8_mode) {
271 				snprintf(errbuf, PCAP_ERRBUF_SIZE,
272 				    "Multiple pcap_init calls with different character encodings");
273 				return (-1);
274 			}
275 		}
276 		pcap_utf_8_mode = 1;
277 		break;
278 
279 	default:
280 		snprintf(errbuf, PCAP_ERRBUF_SIZE, "Unknown options specified");
281 		return (-1);
282 	}
283 
284 	/*
285 	 * Turn the appropriate mode on for error messages; those routines
286 	 * are also used in rpcapd, which has no access to pcap's internal
287 	 * UTF-8 mode flag, so we have to call a routine to set its
288 	 * UTF-8 mode flag.
289 	 */
290 	pcap_fmt_set_encoding(opts);
291 
292 	if (initialized) {
293 		/*
294 		 * Nothing more to do; for example, on Windows, we've
295 		 * already initialized Winsock.
296 		 */
297 		return (0);
298 	}
299 
300 #ifdef _WIN32
301 	/*
302 	 * Now set up Winsock.
303 	 */
304 	if (internal_wsockinit(errbuf) == -1) {
305 		/* Failed. */
306 		return (-1);
307 	}
308 #endif
309 
310 	/*
311 	 * We're done.
312 	 */
313 	initialized = 1;
314 	pcap_new_api = 1;
315 	return (0);
316 }
317 
318 /*
319  * String containing the library version.
320  * Not explicitly exported via a header file - the right API to use
321  * is pcap_lib_version() - but some programs included it, so we
322  * provide it.
323  *
324  * We declare it here, right before defining it, to squelch any
325  * warnings we might get from compilers about the lack of a
326  * declaration.
327  */
328 PCAP_API char pcap_version[];
329 PCAP_API_DEF char pcap_version[] = PACKAGE_VERSION;
330 
331 static void
pcap_set_not_initialized_message(pcap_t * pcap)332 pcap_set_not_initialized_message(pcap_t *pcap)
333 {
334 	if (pcap->activated) {
335 		/* A module probably forgot to set the function pointer */
336 		(void)snprintf(pcap->errbuf, sizeof(pcap->errbuf),
337 		    "This operation isn't properly handled by that device");
338 		return;
339 	}
340 	/* in case the caller doesn't check for PCAP_ERROR_NOT_ACTIVATED */
341 	(void)snprintf(pcap->errbuf, sizeof(pcap->errbuf),
342 	    "This handle hasn't been activated yet");
343 }
344 
345 static int
pcap_read_not_initialized(pcap_t * pcap,int cnt _U_,pcap_handler callback _U_,u_char * user _U_)346 pcap_read_not_initialized(pcap_t *pcap, int cnt _U_, pcap_handler callback _U_,
347     u_char *user _U_)
348 {
349 	pcap_set_not_initialized_message(pcap);
350 	/* this means 'not initialized' */
351 	return (PCAP_ERROR_NOT_ACTIVATED);
352 }
353 
354 static int
pcap_inject_not_initialized(pcap_t * pcap,const void * buf _U_,int size _U_)355 pcap_inject_not_initialized(pcap_t *pcap, const void * buf _U_, int size _U_)
356 {
357 	pcap_set_not_initialized_message(pcap);
358 	/* this means 'not initialized' */
359 	return (PCAP_ERROR_NOT_ACTIVATED);
360 }
361 
362 static int
pcap_setfilter_not_initialized(pcap_t * pcap,struct bpf_program * fp _U_)363 pcap_setfilter_not_initialized(pcap_t *pcap, struct bpf_program *fp _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_setdirection_not_initialized(pcap_t * pcap,pcap_direction_t d _U_)371 pcap_setdirection_not_initialized(pcap_t *pcap, pcap_direction_t d _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_set_datalink_not_initialized(pcap_t * pcap,int dlt _U_)379 pcap_set_datalink_not_initialized(pcap_t *pcap, int dlt _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_getnonblock_not_initialized(pcap_t * pcap)387 pcap_getnonblock_not_initialized(pcap_t *pcap)
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_stats_not_initialized(pcap_t * pcap,struct pcap_stat * ps _U_)395 pcap_stats_not_initialized(pcap_t *pcap, struct pcap_stat *ps _U_)
396 {
397 	pcap_set_not_initialized_message(pcap);
398 	/* this means 'not initialized' */
399 	return (PCAP_ERROR_NOT_ACTIVATED);
400 }
401 
402 #ifdef _WIN32
403 static struct pcap_stat *
pcap_stats_ex_not_initialized(pcap_t * pcap,int * pcap_stat_size _U_)404 pcap_stats_ex_not_initialized(pcap_t *pcap, int *pcap_stat_size _U_)
405 {
406 	pcap_set_not_initialized_message(pcap);
407 	return (NULL);
408 }
409 
410 static int
pcap_setbuff_not_initialized(pcap_t * pcap,int dim _U_)411 pcap_setbuff_not_initialized(pcap_t *pcap, int dim _U_)
412 {
413 	pcap_set_not_initialized_message(pcap);
414 	/* this means 'not initialized' */
415 	return (PCAP_ERROR_NOT_ACTIVATED);
416 }
417 
418 static int
pcap_setmode_not_initialized(pcap_t * pcap,int mode _U_)419 pcap_setmode_not_initialized(pcap_t *pcap, int mode _U_)
420 {
421 	pcap_set_not_initialized_message(pcap);
422 	/* this means 'not initialized' */
423 	return (PCAP_ERROR_NOT_ACTIVATED);
424 }
425 
426 static int
pcap_setmintocopy_not_initialized(pcap_t * pcap,int size _U_)427 pcap_setmintocopy_not_initialized(pcap_t *pcap, int size _U_)
428 {
429 	pcap_set_not_initialized_message(pcap);
430 	/* this means 'not initialized' */
431 	return (PCAP_ERROR_NOT_ACTIVATED);
432 }
433 
434 static HANDLE
pcap_getevent_not_initialized(pcap_t * pcap)435 pcap_getevent_not_initialized(pcap_t *pcap)
436 {
437 	pcap_set_not_initialized_message(pcap);
438 	return (INVALID_HANDLE_VALUE);
439 }
440 
441 static int
pcap_oid_get_request_not_initialized(pcap_t * pcap,bpf_u_int32 oid _U_,void * data _U_,size_t * lenp _U_)442 pcap_oid_get_request_not_initialized(pcap_t *pcap, bpf_u_int32 oid _U_,
443     void *data _U_, size_t *lenp _U_)
444 {
445 	pcap_set_not_initialized_message(pcap);
446 	return (PCAP_ERROR_NOT_ACTIVATED);
447 }
448 
449 static int
pcap_oid_set_request_not_initialized(pcap_t * pcap,bpf_u_int32 oid _U_,const void * data _U_,size_t * lenp _U_)450 pcap_oid_set_request_not_initialized(pcap_t *pcap, bpf_u_int32 oid _U_,
451     const void *data _U_, size_t *lenp _U_)
452 {
453 	pcap_set_not_initialized_message(pcap);
454 	return (PCAP_ERROR_NOT_ACTIVATED);
455 }
456 
457 static u_int
pcap_sendqueue_transmit_not_initialized(pcap_t * pcap,pcap_send_queue * queue _U_,int sync _U_)458 pcap_sendqueue_transmit_not_initialized(pcap_t *pcap, pcap_send_queue* queue _U_,
459     int sync _U_)
460 {
461 	pcap_set_not_initialized_message(pcap);
462 	return (0);
463 }
464 
465 static int
pcap_setuserbuffer_not_initialized(pcap_t * pcap,int size _U_)466 pcap_setuserbuffer_not_initialized(pcap_t *pcap, int size _U_)
467 {
468 	pcap_set_not_initialized_message(pcap);
469 	return (PCAP_ERROR_NOT_ACTIVATED);
470 }
471 
472 static int
pcap_live_dump_not_initialized(pcap_t * pcap,char * filename _U_,int maxsize _U_,int maxpacks _U_)473 pcap_live_dump_not_initialized(pcap_t *pcap, char *filename _U_, int maxsize _U_,
474     int maxpacks _U_)
475 {
476 	pcap_set_not_initialized_message(pcap);
477 	return (PCAP_ERROR_NOT_ACTIVATED);
478 }
479 
480 static int
pcap_live_dump_ended_not_initialized(pcap_t * pcap,int sync _U_)481 pcap_live_dump_ended_not_initialized(pcap_t *pcap, int sync _U_)
482 {
483 	pcap_set_not_initialized_message(pcap);
484 	return (PCAP_ERROR_NOT_ACTIVATED);
485 }
486 
487 static PAirpcapHandle
pcap_get_airpcap_handle_not_initialized(pcap_t * pcap)488 pcap_get_airpcap_handle_not_initialized(pcap_t *pcap)
489 {
490 	pcap_set_not_initialized_message(pcap);
491 	return (NULL);
492 }
493 #endif
494 
495 /*
496  * Returns 1 if rfmon mode can be set on the pcap_t, 0 if it can't,
497  * a PCAP_ERROR value on an error.
498  */
499 int
pcap_can_set_rfmon(pcap_t * p)500 pcap_can_set_rfmon(pcap_t *p)
501 {
502 	return (p->can_set_rfmon_op(p));
503 }
504 
505 /*
506  * For systems where rfmon mode is never supported.
507  */
508 static int
pcap_cant_set_rfmon(pcap_t * p _U_)509 pcap_cant_set_rfmon(pcap_t *p _U_)
510 {
511 	return (0);
512 }
513 
514 /*
515  * Sets *tstamp_typesp to point to an array 1 or more supported time stamp
516  * types; the return value is the number of supported time stamp types.
517  * The list should be freed by a call to pcap_free_tstamp_types() when
518  * you're done with it.
519  *
520  * A return value of 0 means "you don't get a choice of time stamp type",
521  * in which case *tstamp_typesp is set to null.
522  *
523  * PCAP_ERROR is returned on error.
524  */
525 int
pcap_list_tstamp_types(pcap_t * p,int ** tstamp_typesp)526 pcap_list_tstamp_types(pcap_t *p, int **tstamp_typesp)
527 {
528 	if (p->tstamp_type_count == 0) {
529 		/*
530 		 * We don't support multiple time stamp types.
531 		 * That means the only type we support is PCAP_TSTAMP_HOST;
532 		 * set up a list containing only that type.
533 		 */
534 		*tstamp_typesp = (int*)malloc(sizeof(**tstamp_typesp));
535 		if (*tstamp_typesp == NULL) {
536 			pcap_fmt_errmsg_for_errno(p->errbuf, sizeof(p->errbuf),
537 			    errno, "malloc");
538 			return (PCAP_ERROR);
539 		}
540 		**tstamp_typesp = PCAP_TSTAMP_HOST;
541 		return (1);
542 	} else {
543 		*tstamp_typesp = (int*)calloc(sizeof(**tstamp_typesp),
544 		    p->tstamp_type_count);
545 		if (*tstamp_typesp == NULL) {
546 			pcap_fmt_errmsg_for_errno(p->errbuf, sizeof(p->errbuf),
547 			    errno, "malloc");
548 			return (PCAP_ERROR);
549 		}
550 		(void)memcpy(*tstamp_typesp, p->tstamp_type_list,
551 		    sizeof(**tstamp_typesp) * p->tstamp_type_count);
552 		return (p->tstamp_type_count);
553 	}
554 }
555 
556 /*
557  * In Windows, you might have a library built with one version of the
558  * C runtime library and an application built with another version of
559  * the C runtime library, which means that the library might use one
560  * version of malloc() and free() and the application might use another
561  * version of malloc() and free().  If so, that means something
562  * allocated by the library cannot be freed by the application, so we
563  * need to have a pcap_free_tstamp_types() routine to free up the list
564  * allocated by pcap_list_tstamp_types(), even though it's just a wrapper
565  * around free().
566  */
567 void
pcap_free_tstamp_types(int * tstamp_type_list)568 pcap_free_tstamp_types(int *tstamp_type_list)
569 {
570 	free(tstamp_type_list);
571 }
572 
573 /*
574  * Default one-shot callback; overridden for capture types where the
575  * packet data cannot be guaranteed to be available after the callback
576  * returns, so that a copy must be made.
577  */
578 void
pcap_oneshot(u_char * user,const struct pcap_pkthdr * h,const u_char * pkt)579 pcap_oneshot(u_char *user, const struct pcap_pkthdr *h, const u_char *pkt)
580 {
581 	struct oneshot_userdata *sp = (struct oneshot_userdata *)user;
582 
583 	*sp->hdr = *h;
584 	*sp->pkt = pkt;
585 }
586 
587 const u_char *
pcap_next(pcap_t * p,struct pcap_pkthdr * h)588 pcap_next(pcap_t *p, struct pcap_pkthdr *h)
589 {
590 	struct oneshot_userdata s;
591 	const u_char *pkt;
592 
593 	s.hdr = h;
594 	s.pkt = &pkt;
595 	s.pd = p;
596 	if (pcap_dispatch(p, 1, p->oneshot_callback, (u_char *)&s) <= 0)
597 		return (0);
598 	return (pkt);
599 }
600 
601 int
pcap_next_ex(pcap_t * p,struct pcap_pkthdr ** pkt_header,const u_char ** pkt_data)602 pcap_next_ex(pcap_t *p, struct pcap_pkthdr **pkt_header,
603     const u_char **pkt_data)
604 {
605 	struct oneshot_userdata s;
606 
607 	s.hdr = &p->pcap_header;
608 	s.pkt = pkt_data;
609 	s.pd = p;
610 
611 	/* Saves a pointer to the packet headers */
612 	*pkt_header= &p->pcap_header;
613 
614 	if (p->rfile != NULL) {
615 		int status;
616 
617 		/* We are on an offline capture */
618 		status = pcap_offline_read(p, 1, p->oneshot_callback,
619 		    (u_char *)&s);
620 
621 		/*
622 		 * Return codes for pcap_offline_read() are:
623 		 *   -  0: EOF
624 		 *   - -1: error
625 		 *   - >1: OK
626 		 * The first one ('0') conflicts with the return code of
627 		 * 0 from pcap_read() meaning "no packets arrived before
628 		 * the timeout expired", so we map it to -2 so you can
629 		 * distinguish between an EOF from a savefile and a
630 		 * "no packets arrived before the timeout expired, try
631 		 * again" from a live capture.
632 		 */
633 		if (status == 0)
634 			return (-2);
635 		else
636 			return (status);
637 	}
638 
639 	/*
640 	 * Return codes for pcap_read() are:
641 	 *   -  0: timeout
642 	 *   - -1: error
643 	 *   - -2: loop was broken out of with pcap_breakloop()
644 	 *   - >1: OK
645 	 * The first one ('0') conflicts with the return code of 0 from
646 	 * pcap_offline_read() meaning "end of file".
647 	*/
648 	return (p->read_op(p, 1, p->oneshot_callback, (u_char *)&s));
649 }
650 
651 /*
652  * Implementation of a pcap_if_list_t.
653  */
654 struct pcap_if_list {
655 	pcap_if_t *beginning;
656 };
657 
658 static struct capture_source_type {
659 	int (*findalldevs_op)(pcap_if_list_t *, char *);
660 	pcap_t *(*create_op)(const char *, char *, int *);
661 } capture_source_types[] = {
662 #ifdef HAVE_DAG_API
663 	{ dag_findalldevs, dag_create },
664 #endif
665 #ifdef HAVE_SEPTEL_API
666 	{ septel_findalldevs, septel_create },
667 #endif
668 #ifdef HAVE_SNF_API
669 	{ snf_findalldevs, snf_create },
670 #endif
671 #ifdef HAVE_TC_API
672 	{ TcFindAllDevs, TcCreate },
673 #endif
674 #ifdef PCAP_SUPPORT_BT
675 	{ bt_findalldevs, bt_create },
676 #endif
677 #ifdef PCAP_SUPPORT_BT_MONITOR
678 	{ bt_monitor_findalldevs, bt_monitor_create },
679 #endif
680 #ifdef PCAP_SUPPORT_LINUX_USBMON
681 	{ usb_findalldevs, usb_create },
682 #endif
683 #ifdef PCAP_SUPPORT_NETFILTER
684 	{ netfilter_findalldevs, netfilter_create },
685 #endif
686 #ifdef PCAP_SUPPORT_NETMAP
687 	{ pcap_netmap_findalldevs, pcap_netmap_create },
688 #endif
689 #ifdef PCAP_SUPPORT_DBUS
690 	{ dbus_findalldevs, dbus_create },
691 #endif
692 #ifdef PCAP_SUPPORT_RDMASNIFF
693 	{ rdmasniff_findalldevs, rdmasniff_create },
694 #endif
695 #ifdef PCAP_SUPPORT_DPDK
696 	{ pcap_dpdk_findalldevs, pcap_dpdk_create },
697 #endif
698 #ifdef HAVE_AIRPCAP_API
699 	{ airpcap_findalldevs, airpcap_create },
700 #endif
701 	{ NULL, NULL }
702 };
703 
704 /*
705  * Get a list of all capture sources that are up and that we can open.
706  * Returns -1 on error, 0 otherwise.
707  * The list, as returned through "alldevsp", may be null if no interfaces
708  * were up and could be opened.
709  */
710 int
pcap_findalldevs(pcap_if_t ** alldevsp,char * errbuf)711 pcap_findalldevs(pcap_if_t **alldevsp, char *errbuf)
712 {
713 	size_t i;
714 	pcap_if_list_t devlist;
715 
716 	/*
717 	 * Find all the local network interfaces on which we
718 	 * can capture.
719 	 */
720 	devlist.beginning = NULL;
721 	if (pcap_platform_finddevs(&devlist, errbuf) == -1) {
722 		/*
723 		 * Failed - free all of the entries we were given
724 		 * before we failed.
725 		 */
726 		if (devlist.beginning != NULL)
727 			pcap_freealldevs(devlist.beginning);
728 		*alldevsp = NULL;
729 		return (-1);
730 	}
731 
732 	/*
733 	 * Ask each of the non-local-network-interface capture
734 	 * source types what interfaces they have.
735 	 */
736 	for (i = 0; capture_source_types[i].findalldevs_op != NULL; i++) {
737 		if (capture_source_types[i].findalldevs_op(&devlist, errbuf) == -1) {
738 			/*
739 			 * We had an error; free the list we've been
740 			 * constructing.
741 			 */
742 			if (devlist.beginning != NULL)
743 				pcap_freealldevs(devlist.beginning);
744 			*alldevsp = NULL;
745 			return (-1);
746 		}
747 	}
748 
749 	/*
750 	 * Return the first entry of the list of all devices.
751 	 */
752 	*alldevsp = devlist.beginning;
753 	return (0);
754 }
755 
756 static struct sockaddr *
dup_sockaddr(struct sockaddr * sa,size_t sa_length)757 dup_sockaddr(struct sockaddr *sa, size_t sa_length)
758 {
759 	struct sockaddr *newsa;
760 
761 	if ((newsa = malloc(sa_length)) == NULL)
762 		return (NULL);
763 	return (memcpy(newsa, sa, sa_length));
764 }
765 
766 /*
767  * Construct a "figure of merit" for an interface, for use when sorting
768  * the list of interfaces, in which interfaces that are up are superior
769  * to interfaces that aren't up, interfaces that are up and running are
770  * superior to interfaces that are up but not running, and non-loopback
771  * interfaces that are up and running are superior to loopback interfaces,
772  * and interfaces with the same flags have a figure of merit that's higher
773  * the lower the instance number.
774  *
775  * The goal is to try to put the interfaces most likely to be useful for
776  * capture at the beginning of the list.
777  *
778  * The figure of merit, which is lower the "better" the interface is,
779  * has the uppermost bit set if the interface isn't running, the bit
780  * below that set if the interface isn't up, the bit below that
781  * set if the interface is a loopback interface, and the bit below
782  * that set if it's the "any" interface.
783  *
784  * Note: we don't sort by unit number because 1) not all interfaces have
785  * a unit number (systemd, for example, might assign interface names
786  * based on the interface's MAC address or on the physical location of
787  * the adapter's connector), and 2) if the name does end with a simple
788  * unit number, it's not a global property of the interface, it's only
789  * useful as a sort key for device names with the same prefix, so xyz0
790  * shouldn't necessarily sort before abc2.  This means that interfaces
791  * with the same figure of merit will be sorted by the order in which
792  * the mechanism from which we're getting the interfaces supplies them.
793  */
794 static u_int
get_figure_of_merit(pcap_if_t * dev)795 get_figure_of_merit(pcap_if_t *dev)
796 {
797 	u_int n;
798 
799 	n = 0;
800 	if (!(dev->flags & PCAP_IF_RUNNING))
801 		n |= 0x80000000;
802 	if (!(dev->flags & PCAP_IF_UP))
803 		n |= 0x40000000;
804 
805 	/*
806 	 * Give non-wireless interfaces that aren't disconnected a better
807 	 * figure of merit than interfaces that are disconnected, as
808 	 * "disconnected" should indicate that the interface isn't
809 	 * plugged into a network and thus won't give you any traffic.
810 	 *
811 	 * For wireless interfaces, it means "associated with a network",
812 	 * which we presume not to necessarily prevent capture, as you
813 	 * might run the adapter in some flavor of monitor mode.
814 	 */
815 	if (!(dev->flags & PCAP_IF_WIRELESS) &&
816 	    (dev->flags & PCAP_IF_CONNECTION_STATUS) == PCAP_IF_CONNECTION_STATUS_DISCONNECTED)
817 		n |= 0x20000000;
818 
819 	/*
820 	 * Sort loopback devices after non-loopback devices, *except* for
821 	 * disconnected devices.
822 	 */
823 	if (dev->flags & PCAP_IF_LOOPBACK)
824 		n |= 0x10000000;
825 
826 	/*
827 	 * Sort the "any" device before loopback and disconnected devices,
828 	 * but after all other devices.
829 	 */
830 	if (strcmp(dev->name, "any") == 0)
831 		n |= 0x08000000;
832 
833 	return (n);
834 }
835 
836 #ifndef _WIN32
837 /*
838  * Try to get a description for a given device.
839  * Returns a mallocated description if it could and NULL if it couldn't.
840  *
841  * XXX - on FreeBSDs that support it, should it get the sysctl named
842  * "dev.{adapter family name}.{adapter unit}.%desc" to get a description
843  * of the adapter?  Note that "dev.an.0.%desc" is "Aironet PC4500/PC4800"
844  * with my Cisco 350 card, so the name isn't entirely descriptive.  The
845  * "dev.an.0.%pnpinfo" has a better description, although one might argue
846  * that the problem is really a driver bug - if it can find out that it's
847  * a Cisco 340 or 350, rather than an old Aironet card, it should use
848  * that in the description.
849  *
850  * Do NetBSD, DragonflyBSD, or OpenBSD support this as well?  FreeBSD
851  * and OpenBSD let you get a description, but it's not generated by the OS,
852  * it's set with another ioctl that ifconfig supports; we use that to get
853  * a description in FreeBSD and OpenBSD, but if there is no such
854  * description available, it still might be nice to get some description
855  * string based on the device type or something such as that.
856  *
857  * In macOS, the System Configuration framework can apparently return
858  * names in 10.4 and later.
859  *
860  * It also appears that freedesktop.org's HAL offers an "info.product"
861  * string, but the HAL specification says it "should not be used in any
862  * UI" and "subsystem/capability specific properties" should be used
863  * instead and, in any case, I think HAL is being deprecated in
864  * favor of other stuff such as DeviceKit.  DeviceKit doesn't appear
865  * to have any obvious product information for devices, but maybe
866  * I haven't looked hard enough.
867  *
868  * Using the System Configuration framework, or HAL, or DeviceKit, or
869  * whatever, would require that libpcap applications be linked with
870  * the frameworks/libraries in question.  That shouldn't be a problem
871  * for programs linking with the shared version of libpcap (unless
872  * you're running on AIX - which I think is the only UN*X that doesn't
873  * support linking a shared library with other libraries on which it
874  * depends, and having an executable linked only with the first shared
875  * library automatically pick up the other libraries when started -
876  * and using HAL or whatever).  Programs linked with the static
877  * version of libpcap would have to use pcap-config with the --static
878  * flag in order to get the right linker flags in order to pick up
879  * the additional libraries/frameworks; those programs need that anyway
880  * for libpcap 1.1 and beyond on Linux, as, by default, it requires
881  * -lnl.
882  *
883  * Do any other UN*Xes, or desktop environments support getting a
884  * description?
885  */
886 static char *
887 #ifdef SIOCGIFDESCR
get_if_description(const char * name)888 get_if_description(const char *name)
889 {
890 	char *description = NULL;
891 	int s;
892 	struct ifreq ifrdesc;
893 #ifndef IFDESCRSIZE
894 	size_t descrlen = 64;
895 #else
896 	size_t descrlen = IFDESCRSIZE;
897 #endif /* IFDESCRSIZE */
898 
899 	/*
900 	 * Get the description for the interface.
901 	 */
902 	memset(&ifrdesc, 0, sizeof ifrdesc);
903 	pcap_strlcpy(ifrdesc.ifr_name, name, sizeof ifrdesc.ifr_name);
904 	s = socket(AF_INET, SOCK_DGRAM, 0);
905 	if (s >= 0) {
906 #ifdef __FreeBSD__
907 		/*
908 		 * On FreeBSD, if the buffer isn't big enough for the
909 		 * description, the ioctl succeeds, but the description
910 		 * isn't copied, ifr_buffer.length is set to the description
911 		 * length, and ifr_buffer.buffer is set to NULL.
912 		 */
913 		for (;;) {
914 			free(description);
915 			if ((description = malloc(descrlen)) != NULL) {
916 				ifrdesc.ifr_buffer.buffer = description;
917 				ifrdesc.ifr_buffer.length = descrlen;
918 				if (ioctl(s, SIOCGIFDESCR, &ifrdesc) == 0) {
919 					if (ifrdesc.ifr_buffer.buffer ==
920 					    description)
921 						break;
922 					else
923 						descrlen = ifrdesc.ifr_buffer.length;
924 				} else {
925 					/*
926 					 * Failed to get interface description.
927 					 */
928 					free(description);
929 					description = NULL;
930 					break;
931 				}
932 			} else
933 				break;
934 		}
935 #else /* __FreeBSD__ */
936 		/*
937 		 * The only other OS that currently supports
938 		 * SIOCGIFDESCR is OpenBSD, and it has no way
939 		 * to get the description length - it's clamped
940 		 * to a maximum of IFDESCRSIZE.
941 		 */
942 		if ((description = malloc(descrlen)) != NULL) {
943 			ifrdesc.ifr_data = (caddr_t)description;
944 			if (ioctl(s, SIOCGIFDESCR, &ifrdesc) != 0) {
945 				/*
946 				 * Failed to get interface description.
947 				 */
948 				free(description);
949 				description = NULL;
950 			}
951 		}
952 #endif /* __FreeBSD__ */
953 		close(s);
954 		if (description != NULL && description[0] == '\0') {
955 			/*
956 			 * Description is empty, so discard it.
957 			 */
958 			free(description);
959 			description = NULL;
960 		}
961 	}
962 
963 #ifdef __FreeBSD__
964 	/*
965 	 * For FreeBSD, if we didn't get a description, and this is
966 	 * a device with a name of the form usbusN, label it as a USB
967 	 * bus.
968 	 */
969 	if (description == NULL) {
970 		if (strncmp(name, "usbus", 5) == 0) {
971 			/*
972 			 * OK, it begins with "usbus".
973 			 */
974 			long busnum;
975 			char *p;
976 
977 			errno = 0;
978 			busnum = strtol(name + 5, &p, 10);
979 			if (errno == 0 && p != name + 5 && *p == '\0' &&
980 			    busnum >= 0 && busnum <= INT_MAX) {
981 				/*
982 				 * OK, it's a valid number that's not
983 				 * bigger than INT_MAX.  Construct
984 				 * a description from it.
985 				 * (If that fails, we don't worry about
986 				 * it, we just return NULL.)
987 				 */
988 				if (pcap_asprintf(&description,
989 				    "USB bus number %ld", busnum) == -1) {
990 					/* Failed. */
991 					description = NULL;
992 				}
993 			}
994 		}
995 	}
996 #endif
997 	return (description);
998 #else /* SIOCGIFDESCR */
999 get_if_description(const char *name _U_)
1000 {
1001 	return (NULL);
1002 #endif /* SIOCGIFDESCR */
1003 }
1004 
1005 /*
1006  * Look for a given device in the specified list of devices.
1007  *
1008  * If we find it, return a pointer to its entry.
1009  *
1010  * If we don't find it, attempt to add an entry for it, with the specified
1011  * IFF_ flags and description, and, if that succeeds, return a pointer to
1012  * the new entry, otherwise return NULL and set errbuf to an error message.
1013  */
1014 pcap_if_t *
1015 find_or_add_if(pcap_if_list_t *devlistp, const char *name,
1016     bpf_u_int32 if_flags, get_if_flags_func get_flags_func, char *errbuf)
1017 {
1018 	bpf_u_int32 pcap_flags;
1019 
1020 	/*
1021 	 * Convert IFF_ flags to pcap flags.
1022 	 */
1023 	pcap_flags = 0;
1024 #ifdef IFF_LOOPBACK
1025 	if (if_flags & IFF_LOOPBACK)
1026 		pcap_flags |= PCAP_IF_LOOPBACK;
1027 #else
1028 	/*
1029 	 * We don't have IFF_LOOPBACK, so look at the device name to
1030 	 * see if it looks like a loopback device.
1031 	 */
1032 	if (name[0] == 'l' && name[1] == 'o' &&
1033 	    (PCAP_ISDIGIT(name[2]) || name[2] == '\0'))
1034 		pcap_flags |= PCAP_IF_LOOPBACK;
1035 #endif
1036 #ifdef IFF_UP
1037 	if (if_flags & IFF_UP)
1038 		pcap_flags |= PCAP_IF_UP;
1039 #endif
1040 #ifdef IFF_RUNNING
1041 	if (if_flags & IFF_RUNNING)
1042 		pcap_flags |= PCAP_IF_RUNNING;
1043 #endif
1044 
1045 	/*
1046 	 * Attempt to find an entry for this device; if we don't find one,
1047 	 * attempt to add one.
1048 	 */
1049 	return (find_or_add_dev(devlistp, name, pcap_flags,
1050 	    get_flags_func, get_if_description(name), errbuf));
1051 }
1052 
1053 /*
1054  * Look for a given device in the specified list of devices.
1055  *
1056  * If we find it, then, if the specified address isn't null, add it to
1057  * the list of addresses for the device and return 0.
1058  *
1059  * If we don't find it, attempt to add an entry for it, with the specified
1060  * IFF_ flags and description, and, if that succeeds, add the specified
1061  * address to its list of addresses if that address is non-null, and
1062  * return 0, otherwise return -1 and set errbuf to an error message.
1063  *
1064  * (We can get called with a null address because we might get a list
1065  * of interface name/address combinations from the underlying OS, with
1066  * the address being absent in some cases, rather than a list of
1067  * interfaces with each interface having a list of addresses, so this
1068  * call may be the only call made to add to the list, and we want to
1069  * add interfaces even if they have no addresses.)
1070  */
1071 int
1072 add_addr_to_if(pcap_if_list_t *devlistp, const char *name,
1073     bpf_u_int32 if_flags, get_if_flags_func get_flags_func,
1074     struct sockaddr *addr, size_t addr_size,
1075     struct sockaddr *netmask, size_t netmask_size,
1076     struct sockaddr *broadaddr, size_t broadaddr_size,
1077     struct sockaddr *dstaddr, size_t dstaddr_size,
1078     char *errbuf)
1079 {
1080 	pcap_if_t *curdev;
1081 
1082 	/*
1083 	 * Check whether the device exists and, if not, add it.
1084 	 */
1085 	curdev = find_or_add_if(devlistp, name, if_flags, get_flags_func,
1086 	    errbuf);
1087 	if (curdev == NULL) {
1088 		/*
1089 		 * Error - give up.
1090 		 */
1091 		return (-1);
1092 	}
1093 
1094 	if (addr == NULL) {
1095 		/*
1096 		 * There's no address to add; this entry just meant
1097 		 * "here's a new interface".
1098 		 */
1099 		return (0);
1100 	}
1101 
1102 	/*
1103 	 * "curdev" is an entry for this interface, and we have an
1104 	 * address for it; add an entry for that address to the
1105 	 * interface's list of addresses.
1106 	 */
1107 	return (add_addr_to_dev(curdev, addr, addr_size, netmask,
1108 	    netmask_size, broadaddr, broadaddr_size, dstaddr,
1109 	    dstaddr_size, errbuf));
1110 }
1111 #endif /* _WIN32 */
1112 
1113 /*
1114  * Add an entry to the list of addresses for an interface.
1115  * "curdev" is the entry for that interface.
1116  */
1117 int
1118 add_addr_to_dev(pcap_if_t *curdev,
1119     struct sockaddr *addr, size_t addr_size,
1120     struct sockaddr *netmask, size_t netmask_size,
1121     struct sockaddr *broadaddr, size_t broadaddr_size,
1122     struct sockaddr *dstaddr, size_t dstaddr_size,
1123     char *errbuf)
1124 {
1125 	pcap_addr_t *curaddr, *prevaddr, *nextaddr;
1126 
1127 	/*
1128 	 * Allocate the new entry and fill it in.
1129 	 */
1130 	curaddr = (pcap_addr_t *)malloc(sizeof(pcap_addr_t));
1131 	if (curaddr == NULL) {
1132 		pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
1133 		    errno, "malloc");
1134 		return (-1);
1135 	}
1136 
1137 	curaddr->next = NULL;
1138 	if (addr != NULL && addr_size != 0) {
1139 		curaddr->addr = (struct sockaddr *)dup_sockaddr(addr, addr_size);
1140 		if (curaddr->addr == NULL) {
1141 			pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
1142 			    errno, "malloc");
1143 			free(curaddr);
1144 			return (-1);
1145 		}
1146 	} else
1147 		curaddr->addr = NULL;
1148 
1149 	if (netmask != NULL && netmask_size != 0) {
1150 		curaddr->netmask = (struct sockaddr *)dup_sockaddr(netmask, netmask_size);
1151 		if (curaddr->netmask == NULL) {
1152 			pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
1153 			    errno, "malloc");
1154 			if (curaddr->addr != NULL)
1155 				free(curaddr->addr);
1156 			free(curaddr);
1157 			return (-1);
1158 		}
1159 	} else
1160 		curaddr->netmask = NULL;
1161 
1162 	if (broadaddr != NULL && broadaddr_size != 0) {
1163 		curaddr->broadaddr = (struct sockaddr *)dup_sockaddr(broadaddr, broadaddr_size);
1164 		if (curaddr->broadaddr == NULL) {
1165 			pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
1166 			    errno, "malloc");
1167 			if (curaddr->netmask != NULL)
1168 				free(curaddr->netmask);
1169 			if (curaddr->addr != NULL)
1170 				free(curaddr->addr);
1171 			free(curaddr);
1172 			return (-1);
1173 		}
1174 	} else
1175 		curaddr->broadaddr = NULL;
1176 
1177 	if (dstaddr != NULL && dstaddr_size != 0) {
1178 		curaddr->dstaddr = (struct sockaddr *)dup_sockaddr(dstaddr, dstaddr_size);
1179 		if (curaddr->dstaddr == NULL) {
1180 			pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
1181 			    errno, "malloc");
1182 			if (curaddr->broadaddr != NULL)
1183 				free(curaddr->broadaddr);
1184 			if (curaddr->netmask != NULL)
1185 				free(curaddr->netmask);
1186 			if (curaddr->addr != NULL)
1187 				free(curaddr->addr);
1188 			free(curaddr);
1189 			return (-1);
1190 		}
1191 	} else
1192 		curaddr->dstaddr = NULL;
1193 
1194 	/*
1195 	 * Find the end of the list of addresses.
1196 	 */
1197 	for (prevaddr = curdev->addresses; prevaddr != NULL; prevaddr = nextaddr) {
1198 		nextaddr = prevaddr->next;
1199 		if (nextaddr == NULL) {
1200 			/*
1201 			 * This is the end of the list.
1202 			 */
1203 			break;
1204 		}
1205 	}
1206 
1207 	if (prevaddr == NULL) {
1208 		/*
1209 		 * The list was empty; this is the first member.
1210 		 */
1211 		curdev->addresses = curaddr;
1212 	} else {
1213 		/*
1214 		 * "prevaddr" is the last member of the list; append
1215 		 * this member to it.
1216 		 */
1217 		prevaddr->next = curaddr;
1218 	}
1219 
1220 	return (0);
1221 }
1222 
1223 /*
1224  * Look for a given device in the specified list of devices.
1225  *
1226  * If we find it, return 0 and set *curdev_ret to point to it.
1227  *
1228  * If we don't find it, attempt to add an entry for it, with the specified
1229  * flags and description, and, if that succeeds, return 0, otherwise
1230  * return -1 and set errbuf to an error message.
1231  */
1232 pcap_if_t *
1233 find_or_add_dev(pcap_if_list_t *devlistp, const char *name, bpf_u_int32 flags,
1234     get_if_flags_func get_flags_func, const char *description, char *errbuf)
1235 {
1236 	pcap_if_t *curdev;
1237 
1238 	/*
1239 	 * Is there already an entry in the list for this device?
1240 	 */
1241 	curdev = find_dev(devlistp, name);
1242 	if (curdev != NULL) {
1243 		/*
1244 		 * Yes, return it.
1245 		 */
1246 		return (curdev);
1247 	}
1248 
1249 	/*
1250 	 * No, we didn't find it.
1251 	 */
1252 
1253 	/*
1254 	 * Try to get additional flags for the device.
1255 	 */
1256 	if ((*get_flags_func)(name, &flags, errbuf) == -1) {
1257 		/*
1258 		 * Failed.
1259 		 */
1260 		return (NULL);
1261 	}
1262 
1263 	/*
1264 	 * Now, try to add it to the list of devices.
1265 	 */
1266 	return (add_dev(devlistp, name, flags, description, errbuf));
1267 }
1268 
1269 /*
1270  * Look for a given device in the specified list of devices, and return
1271  * the entry for it if we find it or NULL if we don't.
1272  */
1273 pcap_if_t *
1274 find_dev(pcap_if_list_t *devlistp, const char *name)
1275 {
1276 	pcap_if_t *curdev;
1277 
1278 	/*
1279 	 * Is there an entry in the list for this device?
1280 	 */
1281 	for (curdev = devlistp->beginning; curdev != NULL;
1282 	    curdev = curdev->next) {
1283 		if (strcmp(name, curdev->name) == 0) {
1284 			/*
1285 			 * We found it, so, yes, there is.  No need to
1286 			 * add it.  Provide the entry we found to our
1287 			 * caller.
1288 			 */
1289 			return (curdev);
1290 		}
1291 	}
1292 
1293 	/*
1294 	 * No.
1295 	 */
1296 	return (NULL);
1297 }
1298 
1299 /*
1300  * Attempt to add an entry for a device, with the specified flags
1301  * and description, and, if that succeeds, return 0 and return a pointer
1302  * to the new entry, otherwise return NULL and set errbuf to an error
1303  * message.
1304  *
1305  * If we weren't given a description, try to get one.
1306  */
1307 pcap_if_t *
1308 add_dev(pcap_if_list_t *devlistp, const char *name, bpf_u_int32 flags,
1309     const char *description, char *errbuf)
1310 {
1311 	pcap_if_t *curdev, *prevdev, *nextdev;
1312 	u_int this_figure_of_merit, nextdev_figure_of_merit;
1313 
1314 	curdev = malloc(sizeof(pcap_if_t));
1315 	if (curdev == NULL) {
1316 		pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
1317 		    errno, "malloc");
1318 		return (NULL);
1319 	}
1320 
1321 	/*
1322 	 * Fill in the entry.
1323 	 */
1324 	curdev->next = NULL;
1325 	curdev->name = strdup(name);
1326 	if (curdev->name == NULL) {
1327 		pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
1328 		    errno, "malloc");
1329 		free(curdev);
1330 		return (NULL);
1331 	}
1332 	if (description == NULL) {
1333 		/*
1334 		 * We weren't handed a description for the interface.
1335 		 */
1336 		curdev->description = NULL;
1337 	} else {
1338 		/*
1339 		 * We were handed a description; make a copy.
1340 		 */
1341 		curdev->description = strdup(description);
1342 		if (curdev->description == NULL) {
1343 			pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
1344 			    errno, "malloc");
1345 			free(curdev->name);
1346 			free(curdev);
1347 			return (NULL);
1348 		}
1349 	}
1350 	curdev->addresses = NULL;	/* list starts out as empty */
1351 	curdev->flags = flags;
1352 
1353 	/*
1354 	 * Add it to the list, in the appropriate location.
1355 	 * First, get the "figure of merit" for this interface.
1356 	 */
1357 	this_figure_of_merit = get_figure_of_merit(curdev);
1358 
1359 	/*
1360 	 * Now look for the last interface with an figure of merit
1361 	 * less than or equal to the new interface's figure of merit.
1362 	 *
1363 	 * We start with "prevdev" being NULL, meaning we're before
1364 	 * the first element in the list.
1365 	 */
1366 	prevdev = NULL;
1367 	for (;;) {
1368 		/*
1369 		 * Get the interface after this one.
1370 		 */
1371 		if (prevdev == NULL) {
1372 			/*
1373 			 * The next element is the first element.
1374 			 */
1375 			nextdev = devlistp->beginning;
1376 		} else
1377 			nextdev = prevdev->next;
1378 
1379 		/*
1380 		 * Are we at the end of the list?
1381 		 */
1382 		if (nextdev == NULL) {
1383 			/*
1384 			 * Yes - we have to put the new entry after "prevdev".
1385 			 */
1386 			break;
1387 		}
1388 
1389 		/*
1390 		 * Is the new interface's figure of merit less
1391 		 * than the next interface's figure of merit,
1392 		 * meaning that the new interface is better
1393 		 * than the next interface?
1394 		 */
1395 		nextdev_figure_of_merit = get_figure_of_merit(nextdev);
1396 		if (this_figure_of_merit < nextdev_figure_of_merit) {
1397 			/*
1398 			 * Yes - we should put the new entry
1399 			 * before "nextdev", i.e. after "prevdev".
1400 			 */
1401 			break;
1402 		}
1403 
1404 		prevdev = nextdev;
1405 	}
1406 
1407 	/*
1408 	 * Insert before "nextdev".
1409 	 */
1410 	curdev->next = nextdev;
1411 
1412 	/*
1413 	 * Insert after "prevdev" - unless "prevdev" is null,
1414 	 * in which case this is the first interface.
1415 	 */
1416 	if (prevdev == NULL) {
1417 		/*
1418 		 * This is the first interface.  Make it
1419 		 * the first element in the list of devices.
1420 		 */
1421 		devlistp->beginning = curdev;
1422 	} else
1423 		prevdev->next = curdev;
1424 	return (curdev);
1425 }
1426 
1427 /*
1428  * Free a list of interfaces.
1429  */
1430 void
1431 pcap_freealldevs(pcap_if_t *alldevs)
1432 {
1433 	pcap_if_t *curdev, *nextdev;
1434 	pcap_addr_t *curaddr, *nextaddr;
1435 
1436 	for (curdev = alldevs; curdev != NULL; curdev = nextdev) {
1437 		nextdev = curdev->next;
1438 
1439 		/*
1440 		 * Free all addresses.
1441 		 */
1442 		for (curaddr = curdev->addresses; curaddr != NULL; curaddr = nextaddr) {
1443 			nextaddr = curaddr->next;
1444 			if (curaddr->addr)
1445 				free(curaddr->addr);
1446 			if (curaddr->netmask)
1447 				free(curaddr->netmask);
1448 			if (curaddr->broadaddr)
1449 				free(curaddr->broadaddr);
1450 			if (curaddr->dstaddr)
1451 				free(curaddr->dstaddr);
1452 			free(curaddr);
1453 		}
1454 
1455 		/*
1456 		 * Free the name string.
1457 		 */
1458 		free(curdev->name);
1459 
1460 		/*
1461 		 * Free the description string, if any.
1462 		 */
1463 		if (curdev->description != NULL)
1464 			free(curdev->description);
1465 
1466 		/*
1467 		 * Free the interface.
1468 		 */
1469 		free(curdev);
1470 	}
1471 }
1472 
1473 /*
1474  * pcap-npf.c has its own pcap_lookupdev(), for compatibility reasons, as
1475  * it actually returns the names of all interfaces, with a NUL separator
1476  * between them; some callers may depend on that.
1477  *
1478  * MS-DOS has its own pcap_lookupdev(), but that might be useful only
1479  * as an optimization.
1480  *
1481  * In all other cases, we just use pcap_findalldevs() to get a list of
1482  * devices, and pick from that list.
1483  */
1484 #if !defined(HAVE_PACKET32) && !defined(MSDOS)
1485 /*
1486  * Return the name of a network interface attached to the system, or NULL
1487  * if none can be found.  The interface must be configured up; the
1488  * lowest unit number is preferred; loopback is ignored.
1489  */
1490 char *
1491 pcap_lookupdev(char *errbuf)
1492 {
1493 	pcap_if_t *alldevs;
1494 #ifdef _WIN32
1495   /*
1496    * Windows - use the same size as the old WinPcap 3.1 code.
1497    * XXX - this is probably bigger than it needs to be.
1498    */
1499   #define IF_NAMESIZE 8192
1500 #else
1501   /*
1502    * UN*X - use the system's interface name size.
1503    * XXX - that might not be large enough for capture devices
1504    * that aren't regular network interfaces.
1505    */
1506   /* for old BSD systems, including bsdi3 */
1507   #ifndef IF_NAMESIZE
1508   #define IF_NAMESIZE IFNAMSIZ
1509   #endif
1510 #endif
1511 	static char device[IF_NAMESIZE + 1];
1512 	char *ret;
1513 
1514 	/*
1515 	 * We disable this in "new API" mode, because 1) in WinPcap/Npcap,
1516 	 * it may return UTF-16 strings, for backwards-compatibility
1517 	 * reasons, and we're also disabling the hack to make that work,
1518 	 * for not-going-past-the-end-of-a-string reasons, and 2) we
1519 	 * want its behavior to be consistent.
1520 	 *
1521 	 * In addition, it's not thread-safe, so we've marked it as
1522 	 * deprecated.
1523 	 */
1524 	if (pcap_new_api) {
1525 		snprintf(errbuf, PCAP_ERRBUF_SIZE,
1526 		    "pcap_lookupdev() is deprecated and is not supported in programs calling pcap_init()");
1527 		return (NULL);
1528 	}
1529 
1530 	if (pcap_findalldevs(&alldevs, errbuf) == -1)
1531 		return (NULL);
1532 
1533 	if (alldevs == NULL || (alldevs->flags & PCAP_IF_LOOPBACK)) {
1534 		/*
1535 		 * There are no devices on the list, or the first device
1536 		 * on the list is a loopback device, which means there
1537 		 * are no non-loopback devices on the list.  This means
1538 		 * we can't return any device.
1539 		 *
1540 		 * XXX - why not return a loopback device?  If we can't
1541 		 * capture on it, it won't be on the list, and if it's
1542 		 * on the list, there aren't any non-loopback devices,
1543 		 * so why not just supply it as the default device?
1544 		 */
1545 		(void)pcap_strlcpy(errbuf, "no suitable device found",
1546 		    PCAP_ERRBUF_SIZE);
1547 		ret = NULL;
1548 	} else {
1549 		/*
1550 		 * Return the name of the first device on the list.
1551 		 */
1552 		(void)pcap_strlcpy(device, alldevs->name, sizeof(device));
1553 		ret = device;
1554 	}
1555 
1556 	pcap_freealldevs(alldevs);
1557 	return (ret);
1558 }
1559 #endif /* !defined(HAVE_PACKET32) && !defined(MSDOS) */
1560 
1561 #if !defined(_WIN32) && !defined(MSDOS)
1562 /*
1563  * We don't just fetch the entire list of devices, search for the
1564  * particular device, and use its first IPv4 address, as that's too
1565  * much work to get just one device's netmask.
1566  *
1567  * If we had an API to get attributes for a given device, we could
1568  * use that.
1569  */
1570 int
1571 pcap_lookupnet(const char *device, bpf_u_int32 *netp, bpf_u_int32 *maskp,
1572     char *errbuf)
1573 {
1574 	register int fd;
1575 	register struct sockaddr_in *sin4;
1576 	struct ifreq ifr;
1577 
1578 	/*
1579 	 * The pseudo-device "any" listens on all interfaces and therefore
1580 	 * has the network address and -mask "0.0.0.0" therefore catching
1581 	 * all traffic. Using NULL for the interface is the same as "any".
1582 	 */
1583 	if (!device || strcmp(device, "any") == 0
1584 #ifdef HAVE_DAG_API
1585 	    || strstr(device, "dag") != NULL
1586 #endif
1587 #ifdef HAVE_SEPTEL_API
1588 	    || strstr(device, "septel") != NULL
1589 #endif
1590 #ifdef PCAP_SUPPORT_BT
1591 	    || strstr(device, "bluetooth") != NULL
1592 #endif
1593 #ifdef PCAP_SUPPORT_LINUX_USBMON
1594 	    || strstr(device, "usbmon") != NULL
1595 #endif
1596 #ifdef HAVE_SNF_API
1597 	    || strstr(device, "snf") != NULL
1598 #endif
1599 #ifdef PCAP_SUPPORT_NETMAP
1600 	    || strncmp(device, "netmap:", 7) == 0
1601 	    || strncmp(device, "vale", 4) == 0
1602 #endif
1603 #ifdef PCAP_SUPPORT_DPDK
1604 	    || strncmp(device, "dpdk:", 5) == 0
1605 #endif
1606 	    ) {
1607 		*netp = *maskp = 0;
1608 		return 0;
1609 	}
1610 
1611 	fd = socket(AF_INET, SOCK_DGRAM, 0);
1612 	if (fd < 0) {
1613 		pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
1614 		    errno, "socket");
1615 		return (-1);
1616 	}
1617 	memset(&ifr, 0, sizeof(ifr));
1618 #ifdef linux
1619 	/* XXX Work around Linux kernel bug */
1620 	ifr.ifr_addr.sa_family = AF_INET;
1621 #endif
1622 	(void)pcap_strlcpy(ifr.ifr_name, device, sizeof(ifr.ifr_name));
1623 	if (ioctl(fd, SIOCGIFADDR, (char *)&ifr) < 0) {
1624 		if (errno == EADDRNOTAVAIL) {
1625 			(void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
1626 			    "%s: no IPv4 address assigned", device);
1627 		} else {
1628 			pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
1629 			    errno, "SIOCGIFADDR: %s", device);
1630 		}
1631 		(void)close(fd);
1632 		return (-1);
1633 	}
1634 	sin4 = (struct sockaddr_in *)&ifr.ifr_addr;
1635 	*netp = sin4->sin_addr.s_addr;
1636 	memset(&ifr, 0, sizeof(ifr));
1637 #ifdef linux
1638 	/* XXX Work around Linux kernel bug */
1639 	ifr.ifr_addr.sa_family = AF_INET;
1640 #endif
1641 	(void)pcap_strlcpy(ifr.ifr_name, device, sizeof(ifr.ifr_name));
1642 	if (ioctl(fd, SIOCGIFNETMASK, (char *)&ifr) < 0) {
1643 		pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
1644 		    errno, "SIOCGIFNETMASK: %s", device);
1645 		(void)close(fd);
1646 		return (-1);
1647 	}
1648 	(void)close(fd);
1649 	*maskp = sin4->sin_addr.s_addr;
1650 	if (*maskp == 0) {
1651 		if (IN_CLASSA(*netp))
1652 			*maskp = IN_CLASSA_NET;
1653 		else if (IN_CLASSB(*netp))
1654 			*maskp = IN_CLASSB_NET;
1655 		else if (IN_CLASSC(*netp))
1656 			*maskp = IN_CLASSC_NET;
1657 		else {
1658 			(void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
1659 			    "inet class for 0x%x unknown", *netp);
1660 			return (-1);
1661 		}
1662 	}
1663 	*netp &= *maskp;
1664 	return (0);
1665 }
1666 #endif /* !defined(_WIN32) && !defined(MSDOS) */
1667 
1668 #ifdef ENABLE_REMOTE
1669 #include "pcap-rpcap.h"
1670 
1671 /*
1672  * Extract a substring from a string.
1673  */
1674 static char *
1675 get_substring(const char *p, size_t len, char *ebuf)
1676 {
1677 	char *token;
1678 
1679 	token = malloc(len + 1);
1680 	if (token == NULL) {
1681 		pcap_fmt_errmsg_for_errno(ebuf, PCAP_ERRBUF_SIZE,
1682 		    errno, "malloc");
1683 		return (NULL);
1684 	}
1685 	memcpy(token, p, len);
1686 	token[len] = '\0';
1687 	return (token);
1688 }
1689 
1690 /*
1691  * Parse a capture source that might be a URL.
1692  *
1693  * If the source is not a URL, *schemep, *userinfop, *hostp, and *portp
1694  * are set to NULL, *pathp is set to point to the source, and 0 is
1695  * returned.
1696  *
1697  * If source is a URL, and the URL refers to a local device (a special
1698  * case of rpcap:), *schemep, *userinfop, *hostp, and *portp are set
1699  * to NULL, *pathp is set to point to the device name, and 0 is returned.
1700  *
1701  * If source is a URL, and it's not a special case that refers to a local
1702  * device, and the parse succeeds:
1703  *
1704  *    *schemep is set to point to an allocated string containing the scheme;
1705  *
1706  *    if user information is present in the URL, *userinfop is set to point
1707  *    to an allocated string containing the user information, otherwise
1708  *    it's set to NULL;
1709  *
1710  *    if host information is present in the URL, *hostp is set to point
1711  *    to an allocated string containing the host information, otherwise
1712  *    it's set to NULL;
1713  *
1714  *    if a port number is present in the URL, *portp is set to point
1715  *    to an allocated string containing the port number, otherwise
1716  *    it's set to NULL;
1717  *
1718  *    *pathp is set to point to an allocated string containing the
1719  *    path;
1720  *
1721  * and 0 is returned.
1722  *
1723  * If the parse fails, ebuf is set to an error string, and -1 is returned.
1724  */
1725 static int
1726 pcap_parse_source(const char *source, char **schemep, char **userinfop,
1727     char **hostp, char **portp, char **pathp, char *ebuf)
1728 {
1729 	char *colonp;
1730 	size_t scheme_len;
1731 	char *scheme;
1732 	const char *endp;
1733 	size_t authority_len;
1734 	char *authority;
1735 	char *parsep, *atsignp, *bracketp;
1736 	char *userinfo, *host, *port, *path;
1737 
1738 	/*
1739 	 * Start out returning nothing.
1740 	 */
1741 	*schemep = NULL;
1742 	*userinfop = NULL;
1743 	*hostp = NULL;
1744 	*portp = NULL;
1745 	*pathp = NULL;
1746 
1747 	/*
1748 	 * RFC 3986 says:
1749 	 *
1750 	 *   URI         = scheme ":" hier-part [ "?" query ] [ "#" fragment ]
1751 	 *
1752 	 *   hier-part   = "//" authority path-abempty
1753 	 *               / path-absolute
1754 	 *               / path-rootless
1755 	 *               / path-empty
1756 	 *
1757 	 *   authority   = [ userinfo "@" ] host [ ":" port ]
1758 	 *
1759 	 *   userinfo    = *( unreserved / pct-encoded / sub-delims / ":" )
1760          *
1761          * Step 1: look for the ":" at the end of the scheme.
1762 	 * A colon in the source is *NOT* sufficient to indicate that
1763 	 * this is a URL, as interface names on some platforms might
1764 	 * include colons (e.g., I think some Solaris interfaces
1765 	 * might).
1766 	 */
1767 	colonp = strchr(source, ':');
1768 	if (colonp == NULL) {
1769 		/*
1770 		 * The source is the device to open.
1771 		 * Return a NULL pointer for the scheme, user information,
1772 		 * host, and port, and return the device as the path.
1773 		 */
1774 		*pathp = strdup(source);
1775 		if (*pathp == NULL) {
1776 			pcap_fmt_errmsg_for_errno(ebuf, PCAP_ERRBUF_SIZE,
1777 			    errno, "malloc");
1778 			return (-1);
1779 		}
1780 		return (0);
1781 	}
1782 
1783 	/*
1784 	 * All schemes must have "//" after them, i.e. we only support
1785 	 * hier-part   = "//" authority path-abempty, not
1786 	 * hier-part   = path-absolute
1787 	 * hier-part   = path-rootless
1788 	 * hier-part   = path-empty
1789 	 *
1790 	 * We need that in order to distinguish between a local device
1791 	 * name that happens to contain a colon and a URI.
1792 	 */
1793 	if (strncmp(colonp + 1, "//", 2) != 0) {
1794 		/*
1795 		 * The source is the device to open.
1796 		 * Return a NULL pointer for the scheme, user information,
1797 		 * host, and port, and return the device as the path.
1798 		 */
1799 		*pathp = strdup(source);
1800 		if (*pathp == NULL) {
1801 			pcap_fmt_errmsg_for_errno(ebuf, PCAP_ERRBUF_SIZE,
1802 			    errno, "malloc");
1803 			return (-1);
1804 		}
1805 		return (0);
1806 	}
1807 
1808 	/*
1809 	 * XXX - check whether the purported scheme could be a scheme?
1810 	 */
1811 
1812 	/*
1813 	 * OK, this looks like a URL.
1814 	 * Get the scheme.
1815 	 */
1816 	scheme_len = colonp - source;
1817 	scheme = malloc(scheme_len + 1);
1818 	if (scheme == NULL) {
1819 		pcap_fmt_errmsg_for_errno(ebuf, PCAP_ERRBUF_SIZE,
1820 		    errno, "malloc");
1821 		return (-1);
1822 	}
1823 	memcpy(scheme, source, scheme_len);
1824 	scheme[scheme_len] = '\0';
1825 
1826 	/*
1827 	 * Treat file: specially - take everything after file:// as
1828 	 * the pathname.
1829 	 */
1830 	if (pcap_strcasecmp(scheme, "file") == 0) {
1831 		*pathp = strdup(colonp + 3);
1832 		if (*pathp == NULL) {
1833 			pcap_fmt_errmsg_for_errno(ebuf, PCAP_ERRBUF_SIZE,
1834 			    errno, "malloc");
1835 			free(scheme);
1836 			return (-1);
1837 		}
1838 		*schemep = scheme;
1839 		return (0);
1840 	}
1841 
1842 	/*
1843 	 * The WinPcap documentation says you can specify a local
1844 	 * interface with "rpcap://{device}"; we special-case
1845 	 * that here.  If the scheme is "rpcap", and there are
1846 	 * no slashes past the "//", we just return the device.
1847 	 *
1848 	 * XXX - %-escaping?
1849 	 */
1850 	if ((pcap_strcasecmp(scheme, "rpcap") == 0 ||
1851 	    pcap_strcasecmp(scheme, "rpcaps") == 0) &&
1852 	    strchr(colonp + 3, '/') == NULL) {
1853 		/*
1854 		 * Local device.
1855 		 *
1856 		 * Return a NULL pointer for the scheme, user information,
1857 		 * host, and port, and return the device as the path.
1858 		 */
1859 		free(scheme);
1860 		*pathp = strdup(colonp + 3);
1861 		if (*pathp == NULL) {
1862 			pcap_fmt_errmsg_for_errno(ebuf, PCAP_ERRBUF_SIZE,
1863 			    errno, "malloc");
1864 			return (-1);
1865 		}
1866 		return (0);
1867 	}
1868 
1869 	/*
1870 	 * OK, now start parsing the authority.
1871 	 * Get token, terminated with / or terminated at the end of
1872 	 * the string.
1873 	 */
1874 	authority_len = strcspn(colonp + 3, "/");
1875 	authority = get_substring(colonp + 3, authority_len, ebuf);
1876 	if (authority == NULL) {
1877 		/*
1878 		 * Error.
1879 		 */
1880 		free(scheme);
1881 		return (-1);
1882 	}
1883 	endp = colonp + 3 + authority_len;
1884 
1885 	/*
1886 	 * Now carve the authority field into its components.
1887 	 */
1888 	parsep = authority;
1889 
1890 	/*
1891 	 * Is there a userinfo field?
1892 	 */
1893 	atsignp = strchr(parsep, '@');
1894 	if (atsignp != NULL) {
1895 		/*
1896 		 * Yes.
1897 		 */
1898 		size_t userinfo_len;
1899 
1900 		userinfo_len = atsignp - parsep;
1901 		userinfo = get_substring(parsep, userinfo_len, ebuf);
1902 		if (userinfo == NULL) {
1903 			/*
1904 			 * Error.
1905 			 */
1906 			free(authority);
1907 			free(scheme);
1908 			return (-1);
1909 		}
1910 		parsep = atsignp + 1;
1911 	} else {
1912 		/*
1913 		 * No.
1914 		 */
1915 		userinfo = NULL;
1916 	}
1917 
1918 	/*
1919 	 * Is there a host field?
1920 	 */
1921 	if (*parsep == '\0') {
1922 		/*
1923 		 * No; there's no host field or port field.
1924 		 */
1925 		host = NULL;
1926 		port = NULL;
1927 	} else {
1928 		/*
1929 		 * Yes.
1930 		 */
1931 		size_t host_len;
1932 
1933 		/*
1934 		 * Is it an IP-literal?
1935 		 */
1936 		if (*parsep == '[') {
1937 			/*
1938 			 * Yes.
1939 			 * Treat verything up to the closing square
1940 			 * bracket as the IP-Literal; we don't worry
1941 			 * about whether it's a valid IPv6address or
1942 			 * IPvFuture (or an IPv4address, for that
1943 			 * matter, just in case we get handed a
1944 			 * URL with an IPv4 IP-Literal, of the sort
1945 			 * that pcap_createsrcstr() used to generate,
1946 			 * and that pcap_parsesrcstr(), in the original
1947 			 * WinPcap code, accepted).
1948 			 */
1949 			bracketp = strchr(parsep, ']');
1950 			if (bracketp == NULL) {
1951 				/*
1952 				 * There's no closing square bracket.
1953 				 */
1954 				snprintf(ebuf, PCAP_ERRBUF_SIZE,
1955 				    "IP-literal in URL doesn't end with ]");
1956 				free(userinfo);
1957 				free(authority);
1958 				free(scheme);
1959 				return (-1);
1960 			}
1961 			if (*(bracketp + 1) != '\0' &&
1962 			    *(bracketp + 1) != ':') {
1963 				/*
1964 				 * There's extra crud after the
1965 				 * closing square bracketn.
1966 				 */
1967 				snprintf(ebuf, PCAP_ERRBUF_SIZE,
1968 				    "Extra text after IP-literal in URL");
1969 				free(userinfo);
1970 				free(authority);
1971 				free(scheme);
1972 				return (-1);
1973 			}
1974 			host_len = (bracketp - 1) - parsep;
1975 			host = get_substring(parsep + 1, host_len, ebuf);
1976 			if (host == NULL) {
1977 				/*
1978 				 * Error.
1979 				 */
1980 				free(userinfo);
1981 				free(authority);
1982 				free(scheme);
1983 				return (-1);
1984 			}
1985 			parsep = bracketp + 1;
1986 		} else {
1987 			/*
1988 			 * No.
1989 			 * Treat everything up to a : or the end of
1990 			 * the string as the host.
1991 			 */
1992 			host_len = strcspn(parsep, ":");
1993 			host = get_substring(parsep, host_len, ebuf);
1994 			if (host == NULL) {
1995 				/*
1996 				 * Error.
1997 				 */
1998 				free(userinfo);
1999 				free(authority);
2000 				free(scheme);
2001 				return (-1);
2002 			}
2003 			parsep = parsep + host_len;
2004 		}
2005 
2006 		/*
2007 		 * Is there a port field?
2008 		 */
2009 		if (*parsep == ':') {
2010 			/*
2011 			 * Yes.  It's the rest of the authority field.
2012 			 */
2013 			size_t port_len;
2014 
2015 			parsep++;
2016 			port_len = strlen(parsep);
2017 			port = get_substring(parsep, port_len, ebuf);
2018 			if (port == NULL) {
2019 				/*
2020 				 * Error.
2021 				 */
2022 				free(host);
2023 				free(userinfo);
2024 				free(authority);
2025 				free(scheme);
2026 				return (-1);
2027 			}
2028 		} else {
2029 			/*
2030 			 * No.
2031 			 */
2032 			port = NULL;
2033 		}
2034 	}
2035 	free(authority);
2036 
2037 	/*
2038 	 * Everything else is the path.  Strip off the leading /.
2039 	 */
2040 	if (*endp == '\0')
2041 		path = strdup("");
2042 	else
2043 		path = strdup(endp + 1);
2044 	if (path == NULL) {
2045 		pcap_fmt_errmsg_for_errno(ebuf, PCAP_ERRBUF_SIZE,
2046 		    errno, "malloc");
2047 		free(port);
2048 		free(host);
2049 		free(userinfo);
2050 		free(scheme);
2051 		return (-1);
2052 	}
2053 	*schemep = scheme;
2054 	*userinfop = userinfo;
2055 	*hostp = host;
2056 	*portp = port;
2057 	*pathp = path;
2058 	return (0);
2059 }
2060 
2061 int
2062 pcap_createsrcstr_ex(char *source, int type, const char *host, const char *port,
2063     const char *name, unsigned char uses_ssl, char *errbuf)
2064 {
2065 	switch (type) {
2066 
2067 	case PCAP_SRC_FILE:
2068 		pcap_strlcpy(source, PCAP_SRC_FILE_STRING, PCAP_BUF_SIZE);
2069 		if (name != NULL && *name != '\0') {
2070 			pcap_strlcat(source, name, PCAP_BUF_SIZE);
2071 			return (0);
2072 		} else {
2073 			snprintf(errbuf, PCAP_ERRBUF_SIZE,
2074 			    "The file name cannot be NULL.");
2075 			return (-1);
2076 		}
2077 
2078 	case PCAP_SRC_IFREMOTE:
2079 		pcap_strlcpy(source,
2080 		    (uses_ssl ? "rpcaps://" : PCAP_SRC_IF_STRING),
2081 		    PCAP_BUF_SIZE);
2082 		if (host != NULL && *host != '\0') {
2083 			if (strchr(host, ':') != NULL) {
2084 				/*
2085 				 * The host name contains a colon, so it's
2086 				 * probably an IPv6 address, and needs to
2087 				 * be included in square brackets.
2088 				 */
2089 				pcap_strlcat(source, "[", PCAP_BUF_SIZE);
2090 				pcap_strlcat(source, host, PCAP_BUF_SIZE);
2091 				pcap_strlcat(source, "]", PCAP_BUF_SIZE);
2092 			} else
2093 				pcap_strlcat(source, host, PCAP_BUF_SIZE);
2094 
2095 			if (port != NULL && *port != '\0') {
2096 				pcap_strlcat(source, ":", PCAP_BUF_SIZE);
2097 				pcap_strlcat(source, port, PCAP_BUF_SIZE);
2098 			}
2099 
2100 			pcap_strlcat(source, "/", PCAP_BUF_SIZE);
2101 		} else {
2102 			snprintf(errbuf, PCAP_ERRBUF_SIZE,
2103 			    "The host name cannot be NULL.");
2104 			return (-1);
2105 		}
2106 
2107 		if (name != NULL && *name != '\0')
2108 			pcap_strlcat(source, name, PCAP_BUF_SIZE);
2109 
2110 		return (0);
2111 
2112 	case PCAP_SRC_IFLOCAL:
2113 		pcap_strlcpy(source, PCAP_SRC_IF_STRING, PCAP_BUF_SIZE);
2114 
2115 		if (name != NULL && *name != '\0')
2116 			pcap_strlcat(source, name, PCAP_BUF_SIZE);
2117 
2118 		return (0);
2119 
2120 	default:
2121 		snprintf(errbuf, PCAP_ERRBUF_SIZE,
2122 		    "The interface type is not valid.");
2123 		return (-1);
2124 	}
2125 }
2126 
2127 
2128 int
2129 pcap_createsrcstr(char *source, int type, const char *host, const char *port,
2130     const char *name, char *errbuf)
2131 {
2132 	return (pcap_createsrcstr_ex(source, type, host, port, name, 0, errbuf));
2133 }
2134 
2135 int
2136 pcap_parsesrcstr_ex(const char *source, int *type, char *host, char *port,
2137     char *name, unsigned char *uses_ssl, char *errbuf)
2138 {
2139 	char *scheme, *tmpuserinfo, *tmphost, *tmpport, *tmppath;
2140 
2141 	/* Initialization stuff */
2142 	if (host)
2143 		*host = '\0';
2144 	if (port)
2145 		*port = '\0';
2146 	if (name)
2147 		*name = '\0';
2148 	if (uses_ssl)
2149 		*uses_ssl = 0;
2150 
2151 	/* Parse the source string */
2152 	if (pcap_parse_source(source, &scheme, &tmpuserinfo, &tmphost,
2153 	    &tmpport, &tmppath, errbuf) == -1) {
2154 		/*
2155 		 * Fail.
2156 		 */
2157 		return (-1);
2158 	}
2159 
2160 	if (scheme == NULL) {
2161 		/*
2162 		 * Local device.
2163 		 */
2164 		if (name && tmppath)
2165 			pcap_strlcpy(name, tmppath, PCAP_BUF_SIZE);
2166 		if (type)
2167 			*type = PCAP_SRC_IFLOCAL;
2168 		free(tmppath);
2169 		free(tmpport);
2170 		free(tmphost);
2171 		free(tmpuserinfo);
2172 		return (0);
2173 	}
2174 
2175 	int is_rpcap = 0;
2176 	if (strcmp(scheme, "rpcaps") == 0) {
2177 		is_rpcap = 1;
2178 		if (uses_ssl) *uses_ssl = 1;
2179 	} else if (strcmp(scheme, "rpcap") == 0) {
2180 		is_rpcap = 1;
2181 	}
2182 
2183 	if (is_rpcap) {
2184 		/*
2185 		 * rpcap[s]://
2186 		 *
2187 		 * pcap_parse_source() has already handled the case of
2188 		 * rpcap[s]://device
2189 		 */
2190 		if (host && tmphost) {
2191 			if (tmpuserinfo)
2192 				snprintf(host, PCAP_BUF_SIZE, "%s@%s",
2193 				    tmpuserinfo, tmphost);
2194 			else
2195 				pcap_strlcpy(host, tmphost, PCAP_BUF_SIZE);
2196 		}
2197 		if (port && tmpport)
2198 			pcap_strlcpy(port, tmpport, PCAP_BUF_SIZE);
2199 		if (name && tmppath)
2200 			pcap_strlcpy(name, tmppath, PCAP_BUF_SIZE);
2201 		if (type)
2202 			*type = PCAP_SRC_IFREMOTE;
2203 		free(tmppath);
2204 		free(tmpport);
2205 		free(tmphost);
2206 		free(tmpuserinfo);
2207 		free(scheme);
2208 		return (0);
2209 	}
2210 
2211 	if (strcmp(scheme, "file") == 0) {
2212 		/*
2213 		 * file://
2214 		 */
2215 		if (name && tmppath)
2216 			pcap_strlcpy(name, tmppath, PCAP_BUF_SIZE);
2217 		if (type)
2218 			*type = PCAP_SRC_FILE;
2219 		free(tmppath);
2220 		free(tmpport);
2221 		free(tmphost);
2222 		free(tmpuserinfo);
2223 		free(scheme);
2224 		return (0);
2225 	}
2226 
2227 	/*
2228 	 * Neither rpcap: nor file:; just treat the entire string
2229 	 * as a local device.
2230 	 */
2231 	if (name)
2232 		pcap_strlcpy(name, source, PCAP_BUF_SIZE);
2233 	if (type)
2234 		*type = PCAP_SRC_IFLOCAL;
2235 	free(tmppath);
2236 	free(tmpport);
2237 	free(tmphost);
2238 	free(tmpuserinfo);
2239 	free(scheme);
2240 	return (0);
2241 }
2242 
2243 int
2244 pcap_parsesrcstr(const char *source, int *type, char *host, char *port,
2245     char *name, char *errbuf)
2246 {
2247 	return (pcap_parsesrcstr_ex(source, type, host, port, name, NULL, errbuf));
2248 }
2249 #endif
2250 
2251 pcap_t *
2252 pcap_create(const char *device, char *errbuf)
2253 {
2254 	size_t i;
2255 	int is_theirs;
2256 	pcap_t *p;
2257 	char *device_str;
2258 
2259 	/*
2260 	 * A null device name is equivalent to the "any" device -
2261 	 * which might not be supported on this platform, but
2262 	 * this means that you'll get a "not supported" error
2263 	 * rather than, say, a crash when we try to dereference
2264 	 * the null pointer.
2265 	 */
2266 	if (device == NULL)
2267 		device_str = strdup("any");
2268 	else {
2269 #ifdef _WIN32
2270 		/*
2271 		 * On Windows, for backwards compatibility reasons,
2272 		 * pcap_lookupdev() returns a pointer to a sequence of
2273 		 * pairs of UTF-16LE device names and local code page
2274 		 * description strings.
2275 		 *
2276 		 * This means that if a program uses pcap_lookupdev()
2277 		 * to get a default device, and hands that to an API
2278 		 * that opens devices, we'll get handed a UTF-16LE
2279 		 * string, not a string in the local code page.
2280 		 *
2281 		 * To work around that, we check whether the string
2282 		 * looks as if it might be a UTF-16LE string and, if
2283 		 * so, convert it back to the local code page's
2284 		 * extended ASCII.
2285 		 *
2286 		 * We disable that check in "new API" mode, because:
2287 		 *
2288 		 *   1) You *cannot* reliably detect whether a
2289 		 *   string is UTF-16LE or not; "a" could either
2290 		 *   be a one-character ASCII string or the first
2291 		 *   character of a UTF-16LE string.
2292 		 *
2293 		 *   2) Doing that test can run past the end of
2294 		 *   the string, if it's a 1-character ASCII
2295 		 *   string
2296 		 *
2297 		 * This particular version of this heuristic dates
2298 		 * back to WinPcap 4.1.1; PacketOpenAdapter() does
2299 		 * uses the same heuristic, with the exact same
2300 		 * vulnerability.
2301 		 *
2302 		 * That's why we disable this in "new API" mode.
2303 		 * We keep it around in legacy mode for backwards
2304 		 * compatibility.
2305 		 */
2306 		if (!pcap_new_api && device[0] != '\0' && device[1] == '\0') {
2307 			size_t length;
2308 
2309 			length = wcslen((wchar_t *)device);
2310 			device_str = (char *)malloc(length + 1);
2311 			if (device_str == NULL) {
2312 				pcap_fmt_errmsg_for_errno(errbuf,
2313 				    PCAP_ERRBUF_SIZE, errno,
2314 				    "malloc");
2315 				return (NULL);
2316 			}
2317 
2318 			snprintf(device_str, length + 1, "%ws",
2319 			    (const wchar_t *)device);
2320 		} else
2321 #endif
2322 			device_str = strdup(device);
2323 	}
2324 	if (device_str == NULL) {
2325 		pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
2326 		    errno, "malloc");
2327 		return (NULL);
2328 	}
2329 
2330 	/*
2331 	 * Try each of the non-local-network-interface capture
2332 	 * source types until we find one that works for this
2333 	 * device or run out of types.
2334 	 */
2335 	for (i = 0; capture_source_types[i].create_op != NULL; i++) {
2336 		is_theirs = 0;
2337 		p = capture_source_types[i].create_op(device_str, errbuf,
2338 		    &is_theirs);
2339 		if (is_theirs) {
2340 			/*
2341 			 * The device name refers to a device of the
2342 			 * type in question; either it succeeded,
2343 			 * in which case p refers to a pcap_t to
2344 			 * later activate for the device, or it
2345 			 * failed, in which case p is null and we
2346 			 * should return that to report the failure
2347 			 * to create.
2348 			 */
2349 			if (p == NULL) {
2350 				/*
2351 				 * We assume the caller filled in errbuf.
2352 				 */
2353 				free(device_str);
2354 				return (NULL);
2355 			}
2356 			p->opt.device = device_str;
2357 			return (p);
2358 		}
2359 	}
2360 
2361 	/*
2362 	 * OK, try it as a regular network interface.
2363 	 */
2364 	p = pcap_create_interface(device_str, errbuf);
2365 	if (p == NULL) {
2366 		/*
2367 		 * We assume the caller filled in errbuf.
2368 		 */
2369 		free(device_str);
2370 		return (NULL);
2371 	}
2372 	p->opt.device = device_str;
2373 	return (p);
2374 }
2375 
2376 /*
2377  * Set nonblocking mode on an unactivated pcap_t; this sets a flag
2378  * checked by pcap_activate(), which sets the mode after calling
2379  * the activate routine.
2380  */
2381 static int
2382 pcap_setnonblock_unactivated(pcap_t *p, int nonblock)
2383 {
2384 	p->opt.nonblock = nonblock;
2385 	return (0);
2386 }
2387 
2388 static void
2389 initialize_ops(pcap_t *p)
2390 {
2391 	/*
2392 	 * Set operation pointers for operations that only work on
2393 	 * an activated pcap_t to point to a routine that returns
2394 	 * a "this isn't activated" error.
2395 	 */
2396 	p->read_op = pcap_read_not_initialized;
2397 	p->inject_op = pcap_inject_not_initialized;
2398 	p->setfilter_op = pcap_setfilter_not_initialized;
2399 	p->setdirection_op = pcap_setdirection_not_initialized;
2400 	p->set_datalink_op = pcap_set_datalink_not_initialized;
2401 	p->getnonblock_op = pcap_getnonblock_not_initialized;
2402 	p->stats_op = pcap_stats_not_initialized;
2403 #ifdef _WIN32
2404 	p->stats_ex_op = pcap_stats_ex_not_initialized;
2405 	p->setbuff_op = pcap_setbuff_not_initialized;
2406 	p->setmode_op = pcap_setmode_not_initialized;
2407 	p->setmintocopy_op = pcap_setmintocopy_not_initialized;
2408 	p->getevent_op = pcap_getevent_not_initialized;
2409 	p->oid_get_request_op = pcap_oid_get_request_not_initialized;
2410 	p->oid_set_request_op = pcap_oid_set_request_not_initialized;
2411 	p->sendqueue_transmit_op = pcap_sendqueue_transmit_not_initialized;
2412 	p->setuserbuffer_op = pcap_setuserbuffer_not_initialized;
2413 	p->live_dump_op = pcap_live_dump_not_initialized;
2414 	p->live_dump_ended_op = pcap_live_dump_ended_not_initialized;
2415 	p->get_airpcap_handle_op = pcap_get_airpcap_handle_not_initialized;
2416 #endif
2417 
2418 	/*
2419 	 * Default cleanup operation - implementations can override
2420 	 * this, but should call pcap_cleanup_live_common() after
2421 	 * doing their own additional cleanup.
2422 	 */
2423 	p->cleanup_op = pcap_cleanup_live_common;
2424 
2425 	/*
2426 	 * In most cases, the standard one-shot callback can
2427 	 * be used for pcap_next()/pcap_next_ex().
2428 	 */
2429 	p->oneshot_callback = pcap_oneshot;
2430 
2431 	/*
2432 	 * Default breakloop operation - implementations can override
2433 	 * this, but should call pcap_breakloop_common() before doing
2434 	 * their own logic.
2435 	 */
2436 	p->breakloop_op = pcap_breakloop_common;
2437 }
2438 
2439 static pcap_t *
2440 pcap_alloc_pcap_t(char *ebuf, size_t total_size, size_t private_offset)
2441 {
2442 	char *chunk;
2443 	pcap_t *p;
2444 
2445 	/*
2446 	 * total_size is the size of a structure containing a pcap_t
2447 	 * followed by a private structure.
2448 	 */
2449 	chunk = calloc(total_size, 1);
2450 	if (chunk == NULL) {
2451 		pcap_fmt_errmsg_for_errno(ebuf, PCAP_ERRBUF_SIZE,
2452 		    errno, "malloc");
2453 		return (NULL);
2454 	}
2455 
2456 	/*
2457 	 * Get a pointer to the pcap_t at the beginning.
2458 	 */
2459 	p = (pcap_t *)chunk;
2460 
2461 #ifdef _WIN32
2462 	p->handle = INVALID_HANDLE_VALUE;	/* not opened yet */
2463 #else /* _WIN32 */
2464 	p->fd = -1;	/* not opened yet */
2465 #ifndef MSDOS
2466 	p->selectable_fd = -1;
2467 	p->required_select_timeout = NULL;
2468 #endif /* MSDOS */
2469 #endif /* _WIN32 */
2470 
2471 	/*
2472 	 * private_offset is the offset, in bytes, of the private
2473 	 * data from the beginning of the structure.
2474 	 *
2475 	 * Set the pointer to the private data; that's private_offset
2476 	 * bytes past the pcap_t.
2477 	 */
2478 	p->priv = (void *)(chunk + private_offset);
2479 
2480 	return (p);
2481 }
2482 
2483 pcap_t *
2484 pcap_create_common(char *ebuf, size_t total_size, size_t private_offset)
2485 {
2486 	pcap_t *p;
2487 
2488 	p = pcap_alloc_pcap_t(ebuf, total_size, private_offset);
2489 	if (p == NULL)
2490 		return (NULL);
2491 
2492 	/*
2493 	 * Default to "can't set rfmon mode"; if it's supported by
2494 	 * a platform, the create routine that called us can set
2495 	 * the op to its routine to check whether a particular
2496 	 * device supports it.
2497 	 */
2498 	p->can_set_rfmon_op = pcap_cant_set_rfmon;
2499 
2500 	/*
2501 	 * If pcap_setnonblock() is called on a not-yet-activated
2502 	 * pcap_t, default to setting a flag and turning
2503 	 * on non-blocking mode when activated.
2504 	 */
2505 	p->setnonblock_op = pcap_setnonblock_unactivated;
2506 
2507 	initialize_ops(p);
2508 
2509 	/* put in some defaults*/
2510 	p->snapshot = 0;		/* max packet size unspecified */
2511 	p->opt.timeout = 0;		/* no timeout specified */
2512 	p->opt.buffer_size = 0;		/* use the platform's default */
2513 	p->opt.promisc = 0;
2514 	p->opt.rfmon = 0;
2515 	p->opt.immediate = 0;
2516 	p->opt.tstamp_type = -1;	/* default to not setting time stamp type */
2517 	p->opt.tstamp_precision = PCAP_TSTAMP_PRECISION_MICRO;
2518 	/*
2519 	 * Platform-dependent options.
2520 	 */
2521 #ifdef __linux__
2522 	p->opt.protocol = 0;
2523 #endif
2524 #ifdef _WIN32
2525 	p->opt.nocapture_local = 0;
2526 #endif
2527 
2528 	/*
2529 	 * Start out with no BPF code generation flags set.
2530 	 */
2531 	p->bpf_codegen_flags = 0;
2532 
2533 	return (p);
2534 }
2535 
2536 int
2537 pcap_check_activated(pcap_t *p)
2538 {
2539 	if (p->activated) {
2540 		snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "can't perform "
2541 			" operation on activated capture");
2542 		return (-1);
2543 	}
2544 	return (0);
2545 }
2546 
2547 int
2548 pcap_set_snaplen(pcap_t *p, int snaplen)
2549 {
2550 	if (pcap_check_activated(p))
2551 		return (PCAP_ERROR_ACTIVATED);
2552 	p->snapshot = snaplen;
2553 	return (0);
2554 }
2555 
2556 int
2557 pcap_set_promisc(pcap_t *p, int promisc)
2558 {
2559 	if (pcap_check_activated(p))
2560 		return (PCAP_ERROR_ACTIVATED);
2561 	p->opt.promisc = promisc;
2562 	return (0);
2563 }
2564 
2565 int
2566 pcap_set_rfmon(pcap_t *p, int rfmon)
2567 {
2568 	if (pcap_check_activated(p))
2569 		return (PCAP_ERROR_ACTIVATED);
2570 	p->opt.rfmon = rfmon;
2571 	return (0);
2572 }
2573 
2574 int
2575 pcap_set_timeout(pcap_t *p, int timeout_ms)
2576 {
2577 	if (pcap_check_activated(p))
2578 		return (PCAP_ERROR_ACTIVATED);
2579 	p->opt.timeout = timeout_ms;
2580 	return (0);
2581 }
2582 
2583 int
2584 pcap_set_tstamp_type(pcap_t *p, int tstamp_type)
2585 {
2586 	int i;
2587 
2588 	if (pcap_check_activated(p))
2589 		return (PCAP_ERROR_ACTIVATED);
2590 
2591 	/*
2592 	 * The argument should have been u_int, but that's too late
2593 	 * to change now - it's an API.
2594 	 */
2595 	if (tstamp_type < 0)
2596 		return (PCAP_WARNING_TSTAMP_TYPE_NOTSUP);
2597 
2598 	/*
2599 	 * If p->tstamp_type_count is 0, we only support PCAP_TSTAMP_HOST;
2600 	 * the default time stamp type is PCAP_TSTAMP_HOST.
2601 	 */
2602 	if (p->tstamp_type_count == 0) {
2603 		if (tstamp_type == PCAP_TSTAMP_HOST) {
2604 			p->opt.tstamp_type = tstamp_type;
2605 			return (0);
2606 		}
2607 	} else {
2608 		/*
2609 		 * Check whether we claim to support this type of time stamp.
2610 		 */
2611 		for (i = 0; i < p->tstamp_type_count; i++) {
2612 			if (p->tstamp_type_list[i] == (u_int)tstamp_type) {
2613 				/*
2614 				 * Yes.
2615 				 */
2616 				p->opt.tstamp_type = tstamp_type;
2617 				return (0);
2618 			}
2619 		}
2620 	}
2621 
2622 	/*
2623 	 * We don't support this type of time stamp.
2624 	 */
2625 	return (PCAP_WARNING_TSTAMP_TYPE_NOTSUP);
2626 }
2627 
2628 int
2629 pcap_set_immediate_mode(pcap_t *p, int immediate)
2630 {
2631 	if (pcap_check_activated(p))
2632 		return (PCAP_ERROR_ACTIVATED);
2633 	p->opt.immediate = immediate;
2634 	return (0);
2635 }
2636 
2637 int
2638 pcap_set_buffer_size(pcap_t *p, int buffer_size)
2639 {
2640 	if (pcap_check_activated(p))
2641 		return (PCAP_ERROR_ACTIVATED);
2642 	if (buffer_size <= 0) {
2643 		/*
2644 		 * Silently ignore invalid values.
2645 		 */
2646 		return (0);
2647 	}
2648 	p->opt.buffer_size = buffer_size;
2649 	return (0);
2650 }
2651 
2652 int
2653 pcap_set_tstamp_precision(pcap_t *p, int tstamp_precision)
2654 {
2655 	int i;
2656 
2657 	if (pcap_check_activated(p))
2658 		return (PCAP_ERROR_ACTIVATED);
2659 
2660 	/*
2661 	 * The argument should have been u_int, but that's too late
2662 	 * to change now - it's an API.
2663 	 */
2664 	if (tstamp_precision < 0)
2665 		return (PCAP_ERROR_TSTAMP_PRECISION_NOTSUP);
2666 
2667 	/*
2668 	 * If p->tstamp_precision_count is 0, we only support setting
2669 	 * the time stamp precision to microsecond precision; every
2670 	 * pcap module *MUST* support microsecond precision, even if
2671 	 * it does so by converting the native precision to
2672 	 * microseconds.
2673 	 */
2674 	if (p->tstamp_precision_count == 0) {
2675 		if (tstamp_precision == PCAP_TSTAMP_PRECISION_MICRO) {
2676 			p->opt.tstamp_precision = tstamp_precision;
2677 			return (0);
2678 		}
2679 	} else {
2680 		/*
2681 		 * Check whether we claim to support this precision of
2682 		 * time stamp.
2683 		 */
2684 		for (i = 0; i < p->tstamp_precision_count; i++) {
2685 			if (p->tstamp_precision_list[i] == (u_int)tstamp_precision) {
2686 				/*
2687 				 * Yes.
2688 				 */
2689 				p->opt.tstamp_precision = tstamp_precision;
2690 				return (0);
2691 			}
2692 		}
2693 	}
2694 
2695 	/*
2696 	 * We don't support this time stamp precision.
2697 	 */
2698 	return (PCAP_ERROR_TSTAMP_PRECISION_NOTSUP);
2699 }
2700 
2701 int
2702 pcap_get_tstamp_precision(pcap_t *p)
2703 {
2704         return (p->opt.tstamp_precision);
2705 }
2706 
2707 int
2708 pcap_activate(pcap_t *p)
2709 {
2710 	int status;
2711 
2712 	/*
2713 	 * Catch attempts to re-activate an already-activated
2714 	 * pcap_t; this should, for example, catch code that
2715 	 * calls pcap_open_live() followed by pcap_activate(),
2716 	 * as some code that showed up in a Stack Exchange
2717 	 * question did.
2718 	 */
2719 	if (pcap_check_activated(p))
2720 		return (PCAP_ERROR_ACTIVATED);
2721 	status = p->activate_op(p);
2722 	if (status >= 0) {
2723 		/*
2724 		 * If somebody requested non-blocking mode before
2725 		 * calling pcap_activate(), turn it on now.
2726 		 */
2727 		if (p->opt.nonblock) {
2728 			status = p->setnonblock_op(p, 1);
2729 			if (status < 0) {
2730 				/*
2731 				 * Failed.  Undo everything done by
2732 				 * the activate operation.
2733 				 */
2734 				p->cleanup_op(p);
2735 				initialize_ops(p);
2736 				return (status);
2737 			}
2738 		}
2739 		p->activated = 1;
2740 	} else {
2741 		if (p->errbuf[0] == '\0') {
2742 			/*
2743 			 * No error message supplied by the activate routine;
2744 			 * for the benefit of programs that don't specially
2745 			 * handle errors other than PCAP_ERROR, return the
2746 			 * error message corresponding to the status.
2747 			 */
2748 			snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "%s",
2749 			    pcap_statustostr(status));
2750 		}
2751 
2752 		/*
2753 		 * Undo any operation pointer setting, etc. done by
2754 		 * the activate operation.
2755 		 */
2756 		initialize_ops(p);
2757 	}
2758 	return (status);
2759 }
2760 
2761 pcap_t *
2762 pcap_open_live(const char *device, int snaplen, int promisc, int to_ms, char *errbuf)
2763 {
2764 	pcap_t *p;
2765 	int status;
2766 #ifdef ENABLE_REMOTE
2767 	char host[PCAP_BUF_SIZE + 1];
2768 	char port[PCAP_BUF_SIZE + 1];
2769 	char name[PCAP_BUF_SIZE + 1];
2770 	int srctype;
2771 
2772 	/*
2773 	 * A null device name is equivalent to the "any" device -
2774 	 * which might not be supported on this platform, but
2775 	 * this means that you'll get a "not supported" error
2776 	 * rather than, say, a crash when we try to dereference
2777 	 * the null pointer.
2778 	 */
2779 	if (device == NULL)
2780 		device = "any";
2781 
2782 	/*
2783 	 * Retrofit - we have to make older applications compatible with
2784 	 * remote capture.
2785 	 * So we're calling pcap_open_remote() from here; this is a very
2786 	 * dirty hack.
2787 	 * Obviously, we cannot exploit all the new features; for instance,
2788 	 * we cannot send authentication, we cannot use a UDP data connection,
2789 	 * and so on.
2790 	 */
2791 	if (pcap_parsesrcstr(device, &srctype, host, port, name, errbuf))
2792 		return (NULL);
2793 
2794 	if (srctype == PCAP_SRC_IFREMOTE) {
2795 		/*
2796 		 * Although we already have host, port and iface, we prefer
2797 		 * to pass only 'device' to pcap_open_rpcap(), so that it has
2798 		 * to call pcap_parsesrcstr() again.
2799 		 * This is less optimized, but much clearer.
2800 		 */
2801 		return (pcap_open_rpcap(device, snaplen,
2802 		    promisc ? PCAP_OPENFLAG_PROMISCUOUS : 0, to_ms,
2803 		    NULL, errbuf));
2804 	}
2805 	if (srctype == PCAP_SRC_FILE) {
2806 		snprintf(errbuf, PCAP_ERRBUF_SIZE, "unknown URL scheme \"file\"");
2807 		return (NULL);
2808 	}
2809 	if (srctype == PCAP_SRC_IFLOCAL) {
2810 		/*
2811 		 * If it starts with rpcap://, that refers to a local device
2812 		 * (no host part in the URL). Remove the rpcap://, and
2813 		 * fall through to the regular open path.
2814 		 */
2815 		if (strncmp(device, PCAP_SRC_IF_STRING, strlen(PCAP_SRC_IF_STRING)) == 0) {
2816 			size_t len = strlen(device) - strlen(PCAP_SRC_IF_STRING) + 1;
2817 
2818 			if (len > 0)
2819 				device += strlen(PCAP_SRC_IF_STRING);
2820 		}
2821 	}
2822 #endif	/* ENABLE_REMOTE */
2823 
2824 	p = pcap_create(device, errbuf);
2825 	if (p == NULL)
2826 		return (NULL);
2827 	status = pcap_set_snaplen(p, snaplen);
2828 	if (status < 0)
2829 		goto fail;
2830 	status = pcap_set_promisc(p, promisc);
2831 	if (status < 0)
2832 		goto fail;
2833 	status = pcap_set_timeout(p, to_ms);
2834 	if (status < 0)
2835 		goto fail;
2836 	/*
2837 	 * Mark this as opened with pcap_open_live(), so that, for
2838 	 * example, we show the full list of DLT_ values, rather
2839 	 * than just the ones that are compatible with capturing
2840 	 * when not in monitor mode.  That allows existing applications
2841 	 * to work the way they used to work, but allows new applications
2842 	 * that know about the new open API to, for example, find out the
2843 	 * DLT_ values that they can select without changing whether
2844 	 * the adapter is in monitor mode or not.
2845 	 */
2846 	p->oldstyle = 1;
2847 	status = pcap_activate(p);
2848 	if (status < 0)
2849 		goto fail;
2850 	return (p);
2851 fail:
2852 	if (status == PCAP_ERROR)
2853 		snprintf(errbuf, PCAP_ERRBUF_SIZE, "%s: %.*s", device,
2854 		    PCAP_ERRBUF_SIZE - 3, p->errbuf);
2855 	else if (status == PCAP_ERROR_NO_SUCH_DEVICE ||
2856 	    status == PCAP_ERROR_PERM_DENIED ||
2857 	    status == PCAP_ERROR_PROMISC_PERM_DENIED)
2858 		snprintf(errbuf, PCAP_ERRBUF_SIZE, "%s: %s (%.*s)", device,
2859 		    pcap_statustostr(status), PCAP_ERRBUF_SIZE - 6, p->errbuf);
2860 	else
2861 		snprintf(errbuf, PCAP_ERRBUF_SIZE, "%s: %s", device,
2862 		    pcap_statustostr(status));
2863 	pcap_close(p);
2864 	return (NULL);
2865 }
2866 
2867 pcap_t *
2868 pcap_open_offline_common(char *ebuf, size_t total_size, size_t private_offset)
2869 {
2870 	pcap_t *p;
2871 
2872 	p = pcap_alloc_pcap_t(ebuf, total_size, private_offset);
2873 	if (p == NULL)
2874 		return (NULL);
2875 
2876 	p->opt.tstamp_precision = PCAP_TSTAMP_PRECISION_MICRO;
2877 
2878 	return (p);
2879 }
2880 
2881 int
2882 pcap_dispatch(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
2883 {
2884 	return (p->read_op(p, cnt, callback, user));
2885 }
2886 
2887 int
2888 pcap_loop(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
2889 {
2890 	register int n;
2891 
2892 	for (;;) {
2893 		if (p->rfile != NULL) {
2894 			/*
2895 			 * 0 means EOF, so don't loop if we get 0.
2896 			 */
2897 			n = pcap_offline_read(p, cnt, callback, user);
2898 		} else {
2899 			/*
2900 			 * XXX keep reading until we get something
2901 			 * (or an error occurs)
2902 			 */
2903 			do {
2904 				n = p->read_op(p, cnt, callback, user);
2905 			} while (n == 0);
2906 		}
2907 		if (n <= 0)
2908 			return (n);
2909 		if (!PACKET_COUNT_IS_UNLIMITED(cnt)) {
2910 			cnt -= n;
2911 			if (cnt <= 0)
2912 				return (0);
2913 		}
2914 	}
2915 }
2916 
2917 /*
2918  * Force the loop in "pcap_read()" or "pcap_read_offline()" to terminate.
2919  */
2920 void
2921 pcap_breakloop(pcap_t *p)
2922 {
2923 	p->breakloop_op(p);
2924 }
2925 
2926 int
2927 pcap_datalink(pcap_t *p)
2928 {
2929 	if (!p->activated)
2930 		return (PCAP_ERROR_NOT_ACTIVATED);
2931 	return (p->linktype);
2932 }
2933 
2934 int
2935 pcap_datalink_ext(pcap_t *p)
2936 {
2937 	if (!p->activated)
2938 		return (PCAP_ERROR_NOT_ACTIVATED);
2939 	return (p->linktype_ext);
2940 }
2941 
2942 int
2943 pcap_list_datalinks(pcap_t *p, int **dlt_buffer)
2944 {
2945 	if (!p->activated)
2946 		return (PCAP_ERROR_NOT_ACTIVATED);
2947 	if (p->dlt_count == 0) {
2948 		/*
2949 		 * We couldn't fetch the list of DLTs, which means
2950 		 * this platform doesn't support changing the
2951 		 * DLT for an interface.  Return a list of DLTs
2952 		 * containing only the DLT this device supports.
2953 		 */
2954 		*dlt_buffer = (int*)malloc(sizeof(**dlt_buffer));
2955 		if (*dlt_buffer == NULL) {
2956 			pcap_fmt_errmsg_for_errno(p->errbuf, sizeof(p->errbuf),
2957 			    errno, "malloc");
2958 			return (PCAP_ERROR);
2959 		}
2960 		**dlt_buffer = p->linktype;
2961 		return (1);
2962 	} else {
2963 		*dlt_buffer = (int*)calloc(sizeof(**dlt_buffer), p->dlt_count);
2964 		if (*dlt_buffer == NULL) {
2965 			pcap_fmt_errmsg_for_errno(p->errbuf, sizeof(p->errbuf),
2966 			    errno, "malloc");
2967 			return (PCAP_ERROR);
2968 		}
2969 		(void)memcpy(*dlt_buffer, p->dlt_list,
2970 		    sizeof(**dlt_buffer) * p->dlt_count);
2971 		return (p->dlt_count);
2972 	}
2973 }
2974 
2975 /*
2976  * In Windows, you might have a library built with one version of the
2977  * C runtime library and an application built with another version of
2978  * the C runtime library, which means that the library might use one
2979  * version of malloc() and free() and the application might use another
2980  * version of malloc() and free().  If so, that means something
2981  * allocated by the library cannot be freed by the application, so we
2982  * need to have a pcap_free_datalinks() routine to free up the list
2983  * allocated by pcap_list_datalinks(), even though it's just a wrapper
2984  * around free().
2985  */
2986 void
2987 pcap_free_datalinks(int *dlt_list)
2988 {
2989 	free(dlt_list);
2990 }
2991 
2992 int
2993 pcap_set_datalink(pcap_t *p, int dlt)
2994 {
2995 	int i;
2996 	const char *dlt_name;
2997 
2998 	if (dlt < 0)
2999 		goto unsupported;
3000 
3001 	if (p->dlt_count == 0 || p->set_datalink_op == NULL) {
3002 		/*
3003 		 * We couldn't fetch the list of DLTs, or we don't
3004 		 * have a "set datalink" operation, which means
3005 		 * this platform doesn't support changing the
3006 		 * DLT for an interface.  Check whether the new
3007 		 * DLT is the one this interface supports.
3008 		 */
3009 		if (p->linktype != dlt)
3010 			goto unsupported;
3011 
3012 		/*
3013 		 * It is, so there's nothing we need to do here.
3014 		 */
3015 		return (0);
3016 	}
3017 	for (i = 0; i < p->dlt_count; i++)
3018 		if (p->dlt_list[i] == (u_int)dlt)
3019 			break;
3020 	if (i >= p->dlt_count)
3021 		goto unsupported;
3022 	if (p->dlt_count == 2 && p->dlt_list[0] == DLT_EN10MB &&
3023 	    dlt == DLT_DOCSIS) {
3024 		/*
3025 		 * This is presumably an Ethernet device, as the first
3026 		 * link-layer type it offers is DLT_EN10MB, and the only
3027 		 * other type it offers is DLT_DOCSIS.  That means that
3028 		 * we can't tell the driver to supply DOCSIS link-layer
3029 		 * headers - we're just pretending that's what we're
3030 		 * getting, as, presumably, we're capturing on a dedicated
3031 		 * link to a Cisco Cable Modem Termination System, and
3032 		 * it's putting raw DOCSIS frames on the wire inside low-level
3033 		 * Ethernet framing.
3034 		 */
3035 		p->linktype = dlt;
3036 		return (0);
3037 	}
3038 	if (p->set_datalink_op(p, dlt) == -1)
3039 		return (-1);
3040 	p->linktype = dlt;
3041 	return (0);
3042 
3043 unsupported:
3044 	dlt_name = pcap_datalink_val_to_name(dlt);
3045 	if (dlt_name != NULL) {
3046 		(void) snprintf(p->errbuf, sizeof(p->errbuf),
3047 		    "%s is not one of the DLTs supported by this device",
3048 		    dlt_name);
3049 	} else {
3050 		(void) snprintf(p->errbuf, sizeof(p->errbuf),
3051 		    "DLT %d is not one of the DLTs supported by this device",
3052 		    dlt);
3053 	}
3054 	return (-1);
3055 }
3056 
3057 /*
3058  * This array is designed for mapping upper and lower case letter
3059  * together for a case independent comparison.  The mappings are
3060  * based upon ascii character sequences.
3061  */
3062 static const u_char charmap[] = {
3063 	(u_char)'\000', (u_char)'\001', (u_char)'\002', (u_char)'\003',
3064 	(u_char)'\004', (u_char)'\005', (u_char)'\006', (u_char)'\007',
3065 	(u_char)'\010', (u_char)'\011', (u_char)'\012', (u_char)'\013',
3066 	(u_char)'\014', (u_char)'\015', (u_char)'\016', (u_char)'\017',
3067 	(u_char)'\020', (u_char)'\021', (u_char)'\022', (u_char)'\023',
3068 	(u_char)'\024', (u_char)'\025', (u_char)'\026', (u_char)'\027',
3069 	(u_char)'\030', (u_char)'\031', (u_char)'\032', (u_char)'\033',
3070 	(u_char)'\034', (u_char)'\035', (u_char)'\036', (u_char)'\037',
3071 	(u_char)'\040', (u_char)'\041', (u_char)'\042', (u_char)'\043',
3072 	(u_char)'\044', (u_char)'\045', (u_char)'\046', (u_char)'\047',
3073 	(u_char)'\050', (u_char)'\051', (u_char)'\052', (u_char)'\053',
3074 	(u_char)'\054', (u_char)'\055', (u_char)'\056', (u_char)'\057',
3075 	(u_char)'\060', (u_char)'\061', (u_char)'\062', (u_char)'\063',
3076 	(u_char)'\064', (u_char)'\065', (u_char)'\066', (u_char)'\067',
3077 	(u_char)'\070', (u_char)'\071', (u_char)'\072', (u_char)'\073',
3078 	(u_char)'\074', (u_char)'\075', (u_char)'\076', (u_char)'\077',
3079 	(u_char)'\100', (u_char)'\141', (u_char)'\142', (u_char)'\143',
3080 	(u_char)'\144', (u_char)'\145', (u_char)'\146', (u_char)'\147',
3081 	(u_char)'\150', (u_char)'\151', (u_char)'\152', (u_char)'\153',
3082 	(u_char)'\154', (u_char)'\155', (u_char)'\156', (u_char)'\157',
3083 	(u_char)'\160', (u_char)'\161', (u_char)'\162', (u_char)'\163',
3084 	(u_char)'\164', (u_char)'\165', (u_char)'\166', (u_char)'\167',
3085 	(u_char)'\170', (u_char)'\171', (u_char)'\172', (u_char)'\133',
3086 	(u_char)'\134', (u_char)'\135', (u_char)'\136', (u_char)'\137',
3087 	(u_char)'\140', (u_char)'\141', (u_char)'\142', (u_char)'\143',
3088 	(u_char)'\144', (u_char)'\145', (u_char)'\146', (u_char)'\147',
3089 	(u_char)'\150', (u_char)'\151', (u_char)'\152', (u_char)'\153',
3090 	(u_char)'\154', (u_char)'\155', (u_char)'\156', (u_char)'\157',
3091 	(u_char)'\160', (u_char)'\161', (u_char)'\162', (u_char)'\163',
3092 	(u_char)'\164', (u_char)'\165', (u_char)'\166', (u_char)'\167',
3093 	(u_char)'\170', (u_char)'\171', (u_char)'\172', (u_char)'\173',
3094 	(u_char)'\174', (u_char)'\175', (u_char)'\176', (u_char)'\177',
3095 	(u_char)'\200', (u_char)'\201', (u_char)'\202', (u_char)'\203',
3096 	(u_char)'\204', (u_char)'\205', (u_char)'\206', (u_char)'\207',
3097 	(u_char)'\210', (u_char)'\211', (u_char)'\212', (u_char)'\213',
3098 	(u_char)'\214', (u_char)'\215', (u_char)'\216', (u_char)'\217',
3099 	(u_char)'\220', (u_char)'\221', (u_char)'\222', (u_char)'\223',
3100 	(u_char)'\224', (u_char)'\225', (u_char)'\226', (u_char)'\227',
3101 	(u_char)'\230', (u_char)'\231', (u_char)'\232', (u_char)'\233',
3102 	(u_char)'\234', (u_char)'\235', (u_char)'\236', (u_char)'\237',
3103 	(u_char)'\240', (u_char)'\241', (u_char)'\242', (u_char)'\243',
3104 	(u_char)'\244', (u_char)'\245', (u_char)'\246', (u_char)'\247',
3105 	(u_char)'\250', (u_char)'\251', (u_char)'\252', (u_char)'\253',
3106 	(u_char)'\254', (u_char)'\255', (u_char)'\256', (u_char)'\257',
3107 	(u_char)'\260', (u_char)'\261', (u_char)'\262', (u_char)'\263',
3108 	(u_char)'\264', (u_char)'\265', (u_char)'\266', (u_char)'\267',
3109 	(u_char)'\270', (u_char)'\271', (u_char)'\272', (u_char)'\273',
3110 	(u_char)'\274', (u_char)'\275', (u_char)'\276', (u_char)'\277',
3111 	(u_char)'\300', (u_char)'\341', (u_char)'\342', (u_char)'\343',
3112 	(u_char)'\344', (u_char)'\345', (u_char)'\346', (u_char)'\347',
3113 	(u_char)'\350', (u_char)'\351', (u_char)'\352', (u_char)'\353',
3114 	(u_char)'\354', (u_char)'\355', (u_char)'\356', (u_char)'\357',
3115 	(u_char)'\360', (u_char)'\361', (u_char)'\362', (u_char)'\363',
3116 	(u_char)'\364', (u_char)'\365', (u_char)'\366', (u_char)'\367',
3117 	(u_char)'\370', (u_char)'\371', (u_char)'\372', (u_char)'\333',
3118 	(u_char)'\334', (u_char)'\335', (u_char)'\336', (u_char)'\337',
3119 	(u_char)'\340', (u_char)'\341', (u_char)'\342', (u_char)'\343',
3120 	(u_char)'\344', (u_char)'\345', (u_char)'\346', (u_char)'\347',
3121 	(u_char)'\350', (u_char)'\351', (u_char)'\352', (u_char)'\353',
3122 	(u_char)'\354', (u_char)'\355', (u_char)'\356', (u_char)'\357',
3123 	(u_char)'\360', (u_char)'\361', (u_char)'\362', (u_char)'\363',
3124 	(u_char)'\364', (u_char)'\365', (u_char)'\366', (u_char)'\367',
3125 	(u_char)'\370', (u_char)'\371', (u_char)'\372', (u_char)'\373',
3126 	(u_char)'\374', (u_char)'\375', (u_char)'\376', (u_char)'\377',
3127 };
3128 
3129 int
3130 pcap_strcasecmp(const char *s1, const char *s2)
3131 {
3132 	register const u_char	*cm = charmap,
3133 				*us1 = (const u_char *)s1,
3134 				*us2 = (const u_char *)s2;
3135 
3136 	while (cm[*us1] == cm[*us2++])
3137 		if (*us1++ == '\0')
3138 			return(0);
3139 	return (cm[*us1] - cm[*--us2]);
3140 }
3141 
3142 struct dlt_choice {
3143 	const char *name;
3144 	const char *description;
3145 	int	dlt;
3146 };
3147 
3148 #define DLT_CHOICE(code, description) { #code, description, DLT_ ## code }
3149 #define DLT_CHOICE_SENTINEL { NULL, NULL, 0 }
3150 
3151 static struct dlt_choice dlt_choices[] = {
3152 	DLT_CHOICE(NULL, "BSD loopback"),
3153 	DLT_CHOICE(EN10MB, "Ethernet"),
3154 	DLT_CHOICE(IEEE802, "Token ring"),
3155 	DLT_CHOICE(ARCNET, "BSD ARCNET"),
3156 	DLT_CHOICE(SLIP, "SLIP"),
3157 	DLT_CHOICE(PPP, "PPP"),
3158 	DLT_CHOICE(FDDI, "FDDI"),
3159 	DLT_CHOICE(ATM_RFC1483, "RFC 1483 LLC-encapsulated ATM"),
3160 	DLT_CHOICE(RAW, "Raw IP"),
3161 	DLT_CHOICE(SLIP_BSDOS, "BSD/OS SLIP"),
3162 	DLT_CHOICE(PPP_BSDOS, "BSD/OS PPP"),
3163 	DLT_CHOICE(ATM_CLIP, "Linux Classical IP over ATM"),
3164 	DLT_CHOICE(PPP_SERIAL, "PPP over serial"),
3165 	DLT_CHOICE(PPP_ETHER, "PPPoE"),
3166 	DLT_CHOICE(SYMANTEC_FIREWALL, "Symantec Firewall"),
3167 	DLT_CHOICE(C_HDLC, "Cisco HDLC"),
3168 	DLT_CHOICE(IEEE802_11, "802.11"),
3169 	DLT_CHOICE(FRELAY, "Frame Relay"),
3170 	DLT_CHOICE(LOOP, "OpenBSD loopback"),
3171 	DLT_CHOICE(ENC, "OpenBSD encapsulated IP"),
3172 	DLT_CHOICE(LINUX_SLL, "Linux cooked v1"),
3173 	DLT_CHOICE(LTALK, "Localtalk"),
3174 	DLT_CHOICE(PFLOG, "OpenBSD pflog file"),
3175 	DLT_CHOICE(PFSYNC, "Packet filter state syncing"),
3176 	DLT_CHOICE(PRISM_HEADER, "802.11 plus Prism header"),
3177 	DLT_CHOICE(IP_OVER_FC, "RFC 2625 IP-over-Fibre Channel"),
3178 	DLT_CHOICE(SUNATM, "Sun raw ATM"),
3179 	DLT_CHOICE(IEEE802_11_RADIO, "802.11 plus radiotap header"),
3180 	DLT_CHOICE(ARCNET_LINUX, "Linux ARCNET"),
3181 	DLT_CHOICE(JUNIPER_MLPPP, "Juniper Multi-Link PPP"),
3182 	DLT_CHOICE(JUNIPER_MLFR, "Juniper Multi-Link Frame Relay"),
3183 	DLT_CHOICE(JUNIPER_ES, "Juniper Encryption Services PIC"),
3184 	DLT_CHOICE(JUNIPER_GGSN, "Juniper GGSN PIC"),
3185 	DLT_CHOICE(JUNIPER_MFR, "Juniper FRF.16 Frame Relay"),
3186 	DLT_CHOICE(JUNIPER_ATM2, "Juniper ATM2 PIC"),
3187 	DLT_CHOICE(JUNIPER_SERVICES, "Juniper Advanced Services PIC"),
3188 	DLT_CHOICE(JUNIPER_ATM1, "Juniper ATM1 PIC"),
3189 	DLT_CHOICE(APPLE_IP_OVER_IEEE1394, "Apple IP-over-IEEE 1394"),
3190 	DLT_CHOICE(MTP2_WITH_PHDR, "SS7 MTP2 with Pseudo-header"),
3191 	DLT_CHOICE(MTP2, "SS7 MTP2"),
3192 	DLT_CHOICE(MTP3, "SS7 MTP3"),
3193 	DLT_CHOICE(SCCP, "SS7 SCCP"),
3194 	DLT_CHOICE(DOCSIS, "DOCSIS"),
3195 	DLT_CHOICE(LINUX_IRDA, "Linux IrDA"),
3196 	DLT_CHOICE(IEEE802_11_RADIO_AVS, "802.11 plus AVS radio information header"),
3197 	DLT_CHOICE(JUNIPER_MONITOR, "Juniper Passive Monitor PIC"),
3198 	DLT_CHOICE(BACNET_MS_TP, "BACnet MS/TP"),
3199 	DLT_CHOICE(PPP_PPPD, "PPP for pppd, with direction flag"),
3200 	DLT_CHOICE(JUNIPER_PPPOE, "Juniper PPPoE"),
3201 	DLT_CHOICE(JUNIPER_PPPOE_ATM, "Juniper PPPoE/ATM"),
3202 	DLT_CHOICE(GPRS_LLC, "GPRS LLC"),
3203 	DLT_CHOICE(GPF_T, "GPF-T"),
3204 	DLT_CHOICE(GPF_F, "GPF-F"),
3205 	DLT_CHOICE(JUNIPER_PIC_PEER, "Juniper PIC Peer"),
3206 	DLT_CHOICE(ERF_ETH, "Ethernet with Endace ERF header"),
3207 	DLT_CHOICE(ERF_POS, "Packet-over-SONET with Endace ERF header"),
3208 	DLT_CHOICE(LINUX_LAPD, "Linux vISDN LAPD"),
3209 	DLT_CHOICE(JUNIPER_ETHER, "Juniper Ethernet"),
3210 	DLT_CHOICE(JUNIPER_PPP, "Juniper PPP"),
3211 	DLT_CHOICE(JUNIPER_FRELAY, "Juniper Frame Relay"),
3212 	DLT_CHOICE(JUNIPER_CHDLC, "Juniper C-HDLC"),
3213 	DLT_CHOICE(MFR, "FRF.16 Frame Relay"),
3214 	DLT_CHOICE(JUNIPER_VP, "Juniper Voice PIC"),
3215 	DLT_CHOICE(A429, "Arinc 429"),
3216 	DLT_CHOICE(A653_ICM, "Arinc 653 Interpartition Communication"),
3217 	DLT_CHOICE(USB_FREEBSD, "USB with FreeBSD header"),
3218 	DLT_CHOICE(BLUETOOTH_HCI_H4, "Bluetooth HCI UART transport layer"),
3219 	DLT_CHOICE(IEEE802_16_MAC_CPS, "IEEE 802.16 MAC Common Part Sublayer"),
3220 	DLT_CHOICE(USB_LINUX, "USB with Linux header"),
3221 	DLT_CHOICE(CAN20B, "Controller Area Network (CAN) v. 2.0B"),
3222 	DLT_CHOICE(IEEE802_15_4_LINUX, "IEEE 802.15.4 with Linux padding"),
3223 	DLT_CHOICE(PPI, "Per-Packet Information"),
3224 	DLT_CHOICE(IEEE802_16_MAC_CPS_RADIO, "IEEE 802.16 MAC Common Part Sublayer plus radiotap header"),
3225 	DLT_CHOICE(JUNIPER_ISM, "Juniper Integrated Service Module"),
3226 	DLT_CHOICE(IEEE802_15_4, "IEEE 802.15.4 with FCS"),
3227 	DLT_CHOICE(SITA, "SITA pseudo-header"),
3228 	DLT_CHOICE(ERF, "Endace ERF header"),
3229 	DLT_CHOICE(RAIF1, "Ethernet with u10 Networks pseudo-header"),
3230 	DLT_CHOICE(IPMB_KONTRON, "IPMB with Kontron pseudo-header"),
3231 	DLT_CHOICE(JUNIPER_ST, "Juniper Secure Tunnel"),
3232 	DLT_CHOICE(BLUETOOTH_HCI_H4_WITH_PHDR, "Bluetooth HCI UART transport layer plus pseudo-header"),
3233 	DLT_CHOICE(AX25_KISS, "AX.25 with KISS header"),
3234 	DLT_CHOICE(IPMB_LINUX, "IPMB with Linux/Pigeon Point pseudo-header"),
3235 	DLT_CHOICE(IEEE802_15_4_NONASK_PHY, "IEEE 802.15.4 with non-ASK PHY data"),
3236 	DLT_CHOICE(MPLS, "MPLS with label as link-layer header"),
3237 	DLT_CHOICE(LINUX_EVDEV, "Linux evdev events"),
3238 	DLT_CHOICE(USB_LINUX_MMAPPED, "USB with padded Linux header"),
3239 	DLT_CHOICE(DECT, "DECT"),
3240 	DLT_CHOICE(AOS, "AOS Space Data Link protocol"),
3241 	DLT_CHOICE(WIHART, "Wireless HART"),
3242 	DLT_CHOICE(FC_2, "Fibre Channel FC-2"),
3243 	DLT_CHOICE(FC_2_WITH_FRAME_DELIMS, "Fibre Channel FC-2 with frame delimiters"),
3244 	DLT_CHOICE(IPNET, "Solaris ipnet"),
3245 	DLT_CHOICE(CAN_SOCKETCAN, "CAN-bus with SocketCAN headers"),
3246 	DLT_CHOICE(IPV4, "Raw IPv4"),
3247 	DLT_CHOICE(IPV6, "Raw IPv6"),
3248 	DLT_CHOICE(IEEE802_15_4_NOFCS, "IEEE 802.15.4 without FCS"),
3249 	DLT_CHOICE(DBUS, "D-Bus"),
3250 	DLT_CHOICE(JUNIPER_VS, "Juniper Virtual Server"),
3251 	DLT_CHOICE(JUNIPER_SRX_E2E, "Juniper SRX E2E"),
3252 	DLT_CHOICE(JUNIPER_FIBRECHANNEL, "Juniper Fibre Channel"),
3253 	DLT_CHOICE(DVB_CI, "DVB-CI"),
3254 	DLT_CHOICE(MUX27010, "MUX27010"),
3255 	DLT_CHOICE(STANAG_5066_D_PDU, "STANAG 5066 D_PDUs"),
3256 	DLT_CHOICE(JUNIPER_ATM_CEMIC, "Juniper ATM CEMIC"),
3257 	DLT_CHOICE(NFLOG, "Linux netfilter log messages"),
3258 	DLT_CHOICE(NETANALYZER, "Ethernet with Hilscher netANALYZER pseudo-header"),
3259 	DLT_CHOICE(NETANALYZER_TRANSPARENT, "Ethernet with Hilscher netANALYZER pseudo-header and with preamble and SFD"),
3260 	DLT_CHOICE(IPOIB, "RFC 4391 IP-over-Infiniband"),
3261 	DLT_CHOICE(MPEG_2_TS, "MPEG-2 transport stream"),
3262 	DLT_CHOICE(NG40, "ng40 protocol tester Iub/Iur"),
3263 	DLT_CHOICE(NFC_LLCP, "NFC LLCP PDUs with pseudo-header"),
3264 	DLT_CHOICE(INFINIBAND, "InfiniBand"),
3265 	DLT_CHOICE(SCTP, "SCTP"),
3266 	DLT_CHOICE(USBPCAP, "USB with USBPcap header"),
3267 	DLT_CHOICE(RTAC_SERIAL, "Schweitzer Engineering Laboratories RTAC packets"),
3268 	DLT_CHOICE(BLUETOOTH_LE_LL, "Bluetooth Low Energy air interface"),
3269 	DLT_CHOICE(NETLINK, "Linux netlink"),
3270 	DLT_CHOICE(BLUETOOTH_LINUX_MONITOR, "Bluetooth Linux Monitor"),
3271 	DLT_CHOICE(BLUETOOTH_BREDR_BB, "Bluetooth Basic Rate/Enhanced Data Rate baseband packets"),
3272 	DLT_CHOICE(BLUETOOTH_LE_LL_WITH_PHDR, "Bluetooth Low Energy air interface with pseudo-header"),
3273 	DLT_CHOICE(PROFIBUS_DL, "PROFIBUS data link layer"),
3274 	DLT_CHOICE(PKTAP, "Apple DLT_PKTAP"),
3275 	DLT_CHOICE(EPON, "Ethernet with 802.3 Clause 65 EPON preamble"),
3276 	DLT_CHOICE(IPMI_HPM_2, "IPMI trace packets"),
3277 	DLT_CHOICE(ZWAVE_R1_R2, "Z-Wave RF profile R1 and R2 packets"),
3278 	DLT_CHOICE(ZWAVE_R3, "Z-Wave RF profile R3 packets"),
3279 	DLT_CHOICE(WATTSTOPPER_DLM, "WattStopper Digital Lighting Management (DLM) and Legrand Nitoo Open protocol"),
3280 	DLT_CHOICE(ISO_14443, "ISO 14443 messages"),
3281 	DLT_CHOICE(RDS, "IEC 62106 Radio Data System groups"),
3282 	DLT_CHOICE(USB_DARWIN, "USB with Darwin header"),
3283 	DLT_CHOICE(OPENFLOW, "OpenBSD DLT_OPENFLOW"),
3284 	DLT_CHOICE(SDLC, "IBM SDLC frames"),
3285 	DLT_CHOICE(TI_LLN_SNIFFER, "TI LLN sniffer frames"),
3286 	DLT_CHOICE(VSOCK, "Linux vsock"),
3287 	DLT_CHOICE(NORDIC_BLE, "Nordic Semiconductor Bluetooth LE sniffer frames"),
3288 	DLT_CHOICE(DOCSIS31_XRA31, "Excentis XRA-31 DOCSIS 3.1 RF sniffer frames"),
3289 	DLT_CHOICE(ETHERNET_MPACKET, "802.3br mPackets"),
3290 	DLT_CHOICE(DISPLAYPORT_AUX, "DisplayPort AUX channel monitoring data"),
3291 	DLT_CHOICE(LINUX_SLL2, "Linux cooked v2"),
3292 	DLT_CHOICE(OPENVIZSLA, "OpenVizsla USB"),
3293 	DLT_CHOICE(EBHSCR, "Elektrobit High Speed Capture and Replay (EBHSCR)"),
3294 	DLT_CHOICE(VPP_DISPATCH, "VPP graph dispatch tracer"),
3295 	DLT_CHOICE(DSA_TAG_BRCM, "Broadcom tag"),
3296 	DLT_CHOICE(DSA_TAG_BRCM_PREPEND, "Broadcom tag (prepended)"),
3297 	DLT_CHOICE(IEEE802_15_4_TAP, "IEEE 802.15.4 with pseudo-header"),
3298 	DLT_CHOICE(DSA_TAG_DSA, "Marvell DSA"),
3299 	DLT_CHOICE(DSA_TAG_EDSA, "Marvell EDSA"),
3300 	DLT_CHOICE(ELEE, "ELEE lawful intercept packets"),
3301 	DLT_CHOICE(Z_WAVE_SERIAL, "Z-Wave serial frames between host and chip"),
3302 	DLT_CHOICE(USB_2_0, "USB 2.0/1.1/1.0 as transmitted over the cable"),
3303 	DLT_CHOICE(ATSC_ALP, "ATSC Link-Layer Protocol packets"),
3304 	DLT_CHOICE_SENTINEL
3305 };
3306 
3307 int
3308 pcap_datalink_name_to_val(const char *name)
3309 {
3310 	int i;
3311 
3312 	for (i = 0; dlt_choices[i].name != NULL; i++) {
3313 		if (pcap_strcasecmp(dlt_choices[i].name, name) == 0)
3314 			return (dlt_choices[i].dlt);
3315 	}
3316 	return (-1);
3317 }
3318 
3319 const char *
3320 pcap_datalink_val_to_name(int dlt)
3321 {
3322 	int i;
3323 
3324 	for (i = 0; dlt_choices[i].name != NULL; i++) {
3325 		if (dlt_choices[i].dlt == dlt)
3326 			return (dlt_choices[i].name);
3327 	}
3328 	return (NULL);
3329 }
3330 
3331 const char *
3332 pcap_datalink_val_to_description(int dlt)
3333 {
3334 	int i;
3335 
3336 	for (i = 0; dlt_choices[i].name != NULL; i++) {
3337 		if (dlt_choices[i].dlt == dlt)
3338 			return (dlt_choices[i].description);
3339 	}
3340 	return (NULL);
3341 }
3342 
3343 const char *
3344 pcap_datalink_val_to_description_or_dlt(int dlt)
3345 {
3346         static char unkbuf[40];
3347         const char *description;
3348 
3349         description = pcap_datalink_val_to_description(dlt);
3350         if (description != NULL) {
3351                 return description;
3352         } else {
3353                 (void)snprintf(unkbuf, sizeof(unkbuf), "DLT %u", dlt);
3354                 return unkbuf;
3355         }
3356 }
3357 
3358 struct tstamp_type_choice {
3359 	const char *name;
3360 	const char *description;
3361 	int	type;
3362 };
3363 
3364 static struct tstamp_type_choice tstamp_type_choices[] = {
3365 	{ "host", "Host", PCAP_TSTAMP_HOST },
3366 	{ "host_lowprec", "Host, low precision", PCAP_TSTAMP_HOST_LOWPREC },
3367 	{ "host_hiprec", "Host, high precision", PCAP_TSTAMP_HOST_HIPREC },
3368 	{ "adapter", "Adapter", PCAP_TSTAMP_ADAPTER },
3369 	{ "adapter_unsynced", "Adapter, not synced with system time", PCAP_TSTAMP_ADAPTER_UNSYNCED },
3370 	{ "host_hiprec_unsynced", "Host, high precision, not synced with system time", PCAP_TSTAMP_HOST_HIPREC_UNSYNCED },
3371 	{ NULL, NULL, 0 }
3372 };
3373 
3374 int
3375 pcap_tstamp_type_name_to_val(const char *name)
3376 {
3377 	int i;
3378 
3379 	for (i = 0; tstamp_type_choices[i].name != NULL; i++) {
3380 		if (pcap_strcasecmp(tstamp_type_choices[i].name, name) == 0)
3381 			return (tstamp_type_choices[i].type);
3382 	}
3383 	return (PCAP_ERROR);
3384 }
3385 
3386 const char *
3387 pcap_tstamp_type_val_to_name(int tstamp_type)
3388 {
3389 	int i;
3390 
3391 	for (i = 0; tstamp_type_choices[i].name != NULL; i++) {
3392 		if (tstamp_type_choices[i].type == tstamp_type)
3393 			return (tstamp_type_choices[i].name);
3394 	}
3395 	return (NULL);
3396 }
3397 
3398 const char *
3399 pcap_tstamp_type_val_to_description(int tstamp_type)
3400 {
3401 	int i;
3402 
3403 	for (i = 0; tstamp_type_choices[i].name != NULL; i++) {
3404 		if (tstamp_type_choices[i].type == tstamp_type)
3405 			return (tstamp_type_choices[i].description);
3406 	}
3407 	return (NULL);
3408 }
3409 
3410 int
3411 pcap_snapshot(pcap_t *p)
3412 {
3413 	if (!p->activated)
3414 		return (PCAP_ERROR_NOT_ACTIVATED);
3415 	return (p->snapshot);
3416 }
3417 
3418 int
3419 pcap_is_swapped(pcap_t *p)
3420 {
3421 	if (!p->activated)
3422 		return (PCAP_ERROR_NOT_ACTIVATED);
3423 	return (p->swapped);
3424 }
3425 
3426 int
3427 pcap_major_version(pcap_t *p)
3428 {
3429 	if (!p->activated)
3430 		return (PCAP_ERROR_NOT_ACTIVATED);
3431 	return (p->version_major);
3432 }
3433 
3434 int
3435 pcap_minor_version(pcap_t *p)
3436 {
3437 	if (!p->activated)
3438 		return (PCAP_ERROR_NOT_ACTIVATED);
3439 	return (p->version_minor);
3440 }
3441 
3442 int
3443 pcap_bufsize(pcap_t *p)
3444 {
3445 	if (!p->activated)
3446 		return (PCAP_ERROR_NOT_ACTIVATED);
3447 	return (p->bufsize);
3448 }
3449 
3450 FILE *
3451 pcap_file(pcap_t *p)
3452 {
3453 	return (p->rfile);
3454 }
3455 
3456 #ifdef _WIN32
3457 int
3458 pcap_fileno(pcap_t *p)
3459 {
3460 	if (p->handle != INVALID_HANDLE_VALUE) {
3461 		/*
3462 		 * This is a bogus and now-deprecated API; we
3463 		 * squelch the narrowing warning for the cast
3464 		 * from HANDLE to DWORD.  If Windows programmmers
3465 		 * need to get at the HANDLE for a pcap_t, *if*
3466 		 * there is one, they should request such a
3467 		 * routine (and be prepared for it to return
3468 		 * INVALID_HANDLE_VALUE).
3469 		 */
3470 DIAG_OFF_NARROWING
3471 		return ((int)(DWORD)p->handle);
3472 DIAG_ON_NARROWING
3473 	} else
3474 		return (PCAP_ERROR);
3475 }
3476 #else /* _WIN32 */
3477 int
3478 pcap_fileno(pcap_t *p)
3479 {
3480 	return (p->fd);
3481 }
3482 #endif /* _WIN32 */
3483 
3484 #if !defined(_WIN32) && !defined(MSDOS)
3485 int
3486 pcap_get_selectable_fd(pcap_t *p)
3487 {
3488 	return (p->selectable_fd);
3489 }
3490 
3491 const struct timeval *
3492 pcap_get_required_select_timeout(pcap_t *p)
3493 {
3494 	return (p->required_select_timeout);
3495 }
3496 #endif
3497 
3498 void
3499 pcap_perror(pcap_t *p, const char *prefix)
3500 {
3501 	fprintf(stderr, "%s: %s\n", prefix, p->errbuf);
3502 }
3503 
3504 char *
3505 pcap_geterr(pcap_t *p)
3506 {
3507 	return (p->errbuf);
3508 }
3509 
3510 int
3511 pcap_getnonblock(pcap_t *p, char *errbuf)
3512 {
3513 	int ret;
3514 
3515 	ret = p->getnonblock_op(p);
3516 	if (ret == -1) {
3517 		/*
3518 		 * The get nonblock operation sets p->errbuf; this
3519 		 * function *shouldn't* have had a separate errbuf
3520 		 * argument, as it didn't need one, but I goofed
3521 		 * when adding it.
3522 		 *
3523 		 * We copy the error message to errbuf, so callers
3524 		 * can find it in either place.
3525 		 */
3526 		pcap_strlcpy(errbuf, p->errbuf, PCAP_ERRBUF_SIZE);
3527 	}
3528 	return (ret);
3529 }
3530 
3531 /*
3532  * Get the current non-blocking mode setting, under the assumption that
3533  * it's just the standard POSIX non-blocking flag.
3534  */
3535 #if !defined(_WIN32) && !defined(MSDOS)
3536 int
3537 pcap_getnonblock_fd(pcap_t *p)
3538 {
3539 	int fdflags;
3540 
3541 	fdflags = fcntl(p->fd, F_GETFL, 0);
3542 	if (fdflags == -1) {
3543 		pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
3544 		    errno, "F_GETFL");
3545 		return (-1);
3546 	}
3547 	if (fdflags & O_NONBLOCK)
3548 		return (1);
3549 	else
3550 		return (0);
3551 }
3552 #endif
3553 
3554 int
3555 pcap_setnonblock(pcap_t *p, int nonblock, char *errbuf)
3556 {
3557 	int ret;
3558 
3559 	ret = p->setnonblock_op(p, nonblock);
3560 	if (ret == -1) {
3561 		/*
3562 		 * The set nonblock operation sets p->errbuf; this
3563 		 * function *shouldn't* have had a separate errbuf
3564 		 * argument, as it didn't need one, but I goofed
3565 		 * when adding it.
3566 		 *
3567 		 * We copy the error message to errbuf, so callers
3568 		 * can find it in either place.
3569 		 */
3570 		pcap_strlcpy(errbuf, p->errbuf, PCAP_ERRBUF_SIZE);
3571 	}
3572 	return (ret);
3573 }
3574 
3575 #if !defined(_WIN32) && !defined(MSDOS)
3576 /*
3577  * Set non-blocking mode, under the assumption that it's just the
3578  * standard POSIX non-blocking flag.  (This can be called by the
3579  * per-platform non-blocking-mode routine if that routine also
3580  * needs to do some additional work.)
3581  */
3582 int
3583 pcap_setnonblock_fd(pcap_t *p, int nonblock)
3584 {
3585 	int fdflags;
3586 
3587 	fdflags = fcntl(p->fd, F_GETFL, 0);
3588 	if (fdflags == -1) {
3589 		pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
3590 		    errno, "F_GETFL");
3591 		return (-1);
3592 	}
3593 	if (nonblock)
3594 		fdflags |= O_NONBLOCK;
3595 	else
3596 		fdflags &= ~O_NONBLOCK;
3597 	if (fcntl(p->fd, F_SETFL, fdflags) == -1) {
3598 		pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
3599 		    errno, "F_SETFL");
3600 		return (-1);
3601 	}
3602 	return (0);
3603 }
3604 #endif
3605 
3606 /*
3607  * Generate error strings for PCAP_ERROR_ and PCAP_WARNING_ values.
3608  */
3609 const char *
3610 pcap_statustostr(int errnum)
3611 {
3612 	static char ebuf[15+10+1];
3613 
3614 	switch (errnum) {
3615 
3616 	case PCAP_WARNING:
3617 		return("Generic warning");
3618 
3619 	case PCAP_WARNING_TSTAMP_TYPE_NOTSUP:
3620 		return ("That type of time stamp is not supported by that device");
3621 
3622 	case PCAP_WARNING_PROMISC_NOTSUP:
3623 		return ("That device doesn't support promiscuous mode");
3624 
3625 	case PCAP_ERROR:
3626 		return("Generic error");
3627 
3628 	case PCAP_ERROR_BREAK:
3629 		return("Loop terminated by pcap_breakloop");
3630 
3631 	case PCAP_ERROR_NOT_ACTIVATED:
3632 		return("The pcap_t has not been activated");
3633 
3634 	case PCAP_ERROR_ACTIVATED:
3635 		return ("The setting can't be changed after the pcap_t is activated");
3636 
3637 	case PCAP_ERROR_NO_SUCH_DEVICE:
3638 		return ("No such device exists");
3639 
3640 	case PCAP_ERROR_RFMON_NOTSUP:
3641 		return ("That device doesn't support monitor mode");
3642 
3643 	case PCAP_ERROR_NOT_RFMON:
3644 		return ("That operation is supported only in monitor mode");
3645 
3646 	case PCAP_ERROR_PERM_DENIED:
3647 		return ("You don't have permission to capture on that device");
3648 
3649 	case PCAP_ERROR_IFACE_NOT_UP:
3650 		return ("That device is not up");
3651 
3652 	case PCAP_ERROR_CANTSET_TSTAMP_TYPE:
3653 		return ("That device doesn't support setting the time stamp type");
3654 
3655 	case PCAP_ERROR_PROMISC_PERM_DENIED:
3656 		return ("You don't have permission to capture in promiscuous mode on that device");
3657 
3658 	case PCAP_ERROR_TSTAMP_PRECISION_NOTSUP:
3659 		return ("That device doesn't support that time stamp precision");
3660 	}
3661 	(void)snprintf(ebuf, sizeof ebuf, "Unknown error: %d", errnum);
3662 	return(ebuf);
3663 }
3664 
3665 /*
3666  * Not all systems have strerror().
3667  */
3668 const char *
3669 pcap_strerror(int errnum)
3670 {
3671 #ifdef HAVE_STRERROR
3672 #ifdef _WIN32
3673 	static char errbuf[PCAP_ERRBUF_SIZE];
3674 	errno_t err = strerror_s(errbuf, PCAP_ERRBUF_SIZE, errnum);
3675 
3676 	if (err != 0) /* err = 0 if successful */
3677 		pcap_strlcpy(errbuf, "strerror_s() error", PCAP_ERRBUF_SIZE);
3678 	return (errbuf);
3679 #else
3680 	return (strerror(errnum));
3681 #endif /* _WIN32 */
3682 #else
3683 	extern int sys_nerr;
3684 	extern const char *const sys_errlist[];
3685 	static char errbuf[PCAP_ERRBUF_SIZE];
3686 
3687 	if ((unsigned int)errnum < sys_nerr)
3688 		return ((char *)sys_errlist[errnum]);
3689 	(void)snprintf(errbuf, sizeof errbuf, "Unknown error: %d", errnum);
3690 	return (errbuf);
3691 #endif
3692 }
3693 
3694 int
3695 pcap_setfilter(pcap_t *p, struct bpf_program *fp)
3696 {
3697 	return (p->setfilter_op(p, fp));
3698 }
3699 
3700 /*
3701  * Set direction flag, which controls whether we accept only incoming
3702  * packets, only outgoing packets, or both.
3703  * Note that, depending on the platform, some or all direction arguments
3704  * might not be supported.
3705  */
3706 int
3707 pcap_setdirection(pcap_t *p, pcap_direction_t d)
3708 {
3709 	if (p->setdirection_op == NULL) {
3710 		snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
3711 		    "Setting direction is not supported on this device");
3712 		return (-1);
3713 	} else {
3714 		switch (d) {
3715 
3716 		case PCAP_D_IN:
3717 		case PCAP_D_OUT:
3718 		case PCAP_D_INOUT:
3719 			/*
3720 			 * Valid direction.
3721 			 */
3722 			return (p->setdirection_op(p, d));
3723 
3724 		default:
3725 			/*
3726 			 * Invalid direction.
3727 			 */
3728 			snprintf(p->errbuf, sizeof(p->errbuf),
3729 			    "Invalid direction");
3730 			return (-1);
3731 		}
3732 	}
3733 }
3734 
3735 int
3736 pcap_stats(pcap_t *p, struct pcap_stat *ps)
3737 {
3738 	return (p->stats_op(p, ps));
3739 }
3740 
3741 #ifdef _WIN32
3742 struct pcap_stat *
3743 pcap_stats_ex(pcap_t *p, int *pcap_stat_size)
3744 {
3745 	return (p->stats_ex_op(p, pcap_stat_size));
3746 }
3747 
3748 int
3749 pcap_setbuff(pcap_t *p, int dim)
3750 {
3751 	return (p->setbuff_op(p, dim));
3752 }
3753 
3754 int
3755 pcap_setmode(pcap_t *p, int mode)
3756 {
3757 	return (p->setmode_op(p, mode));
3758 }
3759 
3760 int
3761 pcap_setmintocopy(pcap_t *p, int size)
3762 {
3763 	return (p->setmintocopy_op(p, size));
3764 }
3765 
3766 HANDLE
3767 pcap_getevent(pcap_t *p)
3768 {
3769 	return (p->getevent_op(p));
3770 }
3771 
3772 int
3773 pcap_oid_get_request(pcap_t *p, bpf_u_int32 oid, void *data, size_t *lenp)
3774 {
3775 	return (p->oid_get_request_op(p, oid, data, lenp));
3776 }
3777 
3778 int
3779 pcap_oid_set_request(pcap_t *p, bpf_u_int32 oid, const void *data, size_t *lenp)
3780 {
3781 	return (p->oid_set_request_op(p, oid, data, lenp));
3782 }
3783 
3784 pcap_send_queue *
3785 pcap_sendqueue_alloc(u_int memsize)
3786 {
3787 	pcap_send_queue *tqueue;
3788 
3789 	/* Allocate the queue */
3790 	tqueue = (pcap_send_queue *)malloc(sizeof(pcap_send_queue));
3791 	if (tqueue == NULL){
3792 		return (NULL);
3793 	}
3794 
3795 	/* Allocate the buffer */
3796 	tqueue->buffer = (char *)malloc(memsize);
3797 	if (tqueue->buffer == NULL) {
3798 		free(tqueue);
3799 		return (NULL);
3800 	}
3801 
3802 	tqueue->maxlen = memsize;
3803 	tqueue->len = 0;
3804 
3805 	return (tqueue);
3806 }
3807 
3808 void
3809 pcap_sendqueue_destroy(pcap_send_queue *queue)
3810 {
3811 	free(queue->buffer);
3812 	free(queue);
3813 }
3814 
3815 int
3816 pcap_sendqueue_queue(pcap_send_queue *queue, const struct pcap_pkthdr *pkt_header, const u_char *pkt_data)
3817 {
3818 	if (queue->len + sizeof(struct pcap_pkthdr) + pkt_header->caplen > queue->maxlen){
3819 		return (-1);
3820 	}
3821 
3822 	/* Copy the pcap_pkthdr header*/
3823 	memcpy(queue->buffer + queue->len, pkt_header, sizeof(struct pcap_pkthdr));
3824 	queue->len += sizeof(struct pcap_pkthdr);
3825 
3826 	/* copy the packet */
3827 	memcpy(queue->buffer + queue->len, pkt_data, pkt_header->caplen);
3828 	queue->len += pkt_header->caplen;
3829 
3830 	return (0);
3831 }
3832 
3833 u_int
3834 pcap_sendqueue_transmit(pcap_t *p, pcap_send_queue *queue, int sync)
3835 {
3836 	return (p->sendqueue_transmit_op(p, queue, sync));
3837 }
3838 
3839 int
3840 pcap_setuserbuffer(pcap_t *p, int size)
3841 {
3842 	return (p->setuserbuffer_op(p, size));
3843 }
3844 
3845 int
3846 pcap_live_dump(pcap_t *p, char *filename, int maxsize, int maxpacks)
3847 {
3848 	return (p->live_dump_op(p, filename, maxsize, maxpacks));
3849 }
3850 
3851 int
3852 pcap_live_dump_ended(pcap_t *p, int sync)
3853 {
3854 	return (p->live_dump_ended_op(p, sync));
3855 }
3856 
3857 PAirpcapHandle
3858 pcap_get_airpcap_handle(pcap_t *p)
3859 {
3860 	PAirpcapHandle handle;
3861 
3862 	handle = p->get_airpcap_handle_op(p);
3863 	if (handle == NULL) {
3864 		(void)snprintf(p->errbuf, sizeof(p->errbuf),
3865 		    "This isn't an AirPcap device");
3866 	}
3867 	return (handle);
3868 }
3869 #endif
3870 
3871 /*
3872  * On some platforms, we need to clean up promiscuous or monitor mode
3873  * when we close a device - and we want that to happen even if the
3874  * application just exits without explicitl closing devices.
3875  * On those platforms, we need to register a "close all the pcaps"
3876  * routine to be called when we exit, and need to maintain a list of
3877  * pcaps that need to be closed to clean up modes.
3878  *
3879  * XXX - not thread-safe.
3880  */
3881 
3882 /*
3883  * List of pcaps on which we've done something that needs to be
3884  * cleaned up.
3885  * If there are any such pcaps, we arrange to call "pcap_close_all()"
3886  * when we exit, and have it close all of them.
3887  */
3888 static struct pcap *pcaps_to_close;
3889 
3890 /*
3891  * TRUE if we've already called "atexit()" to cause "pcap_close_all()" to
3892  * be called on exit.
3893  */
3894 static int did_atexit;
3895 
3896 static void
3897 pcap_close_all(void)
3898 {
3899 	struct pcap *handle;
3900 
3901 	while ((handle = pcaps_to_close) != NULL) {
3902 		pcap_close(handle);
3903 
3904 		/*
3905 		 * If a pcap module adds a pcap_t to the "close all"
3906 		 * list by calling pcap_add_to_pcaps_to_close(), it
3907 		 * must have a cleanup routine that removes it from the
3908 		 * list, by calling pcap_remove_from_pcaps_to_close(),
3909 		 * and must make that cleanup routine the cleanup_op
3910 		 * for the pcap_t.
3911 		 *
3912 		 * That means that, after pcap_close() - which calls
3913 		 * the cleanup_op for the pcap_t - the pcap_t must
3914 		 * have been removed from the list, so pcaps_to_close
3915 		 * must not be equal to handle.
3916 		 *
3917 		 * We check for that, and abort if handle is still
3918 		 * at the head of the list, to prevent infinite loops.
3919 		 */
3920 		if (pcaps_to_close == handle)
3921 			abort();
3922 	}
3923 }
3924 
3925 int
3926 pcap_do_addexit(pcap_t *p)
3927 {
3928 	/*
3929 	 * If we haven't already done so, arrange to have
3930 	 * "pcap_close_all()" called when we exit.
3931 	 */
3932 	if (!did_atexit) {
3933 		if (atexit(pcap_close_all) != 0) {
3934 			/*
3935 			 * "atexit()" failed; let our caller know.
3936 			 */
3937 			pcap_strlcpy(p->errbuf, "atexit failed", PCAP_ERRBUF_SIZE);
3938 			return (0);
3939 		}
3940 		did_atexit = 1;
3941 	}
3942 	return (1);
3943 }
3944 
3945 void
3946 pcap_add_to_pcaps_to_close(pcap_t *p)
3947 {
3948 	p->next = pcaps_to_close;
3949 	pcaps_to_close = p;
3950 }
3951 
3952 void
3953 pcap_remove_from_pcaps_to_close(pcap_t *p)
3954 {
3955 	pcap_t *pc, *prevpc;
3956 
3957 	for (pc = pcaps_to_close, prevpc = NULL; pc != NULL;
3958 	    prevpc = pc, pc = pc->next) {
3959 		if (pc == p) {
3960 			/*
3961 			 * Found it.  Remove it from the list.
3962 			 */
3963 			if (prevpc == NULL) {
3964 				/*
3965 				 * It was at the head of the list.
3966 				 */
3967 				pcaps_to_close = pc->next;
3968 			} else {
3969 				/*
3970 				 * It was in the middle of the list.
3971 				 */
3972 				prevpc->next = pc->next;
3973 			}
3974 			break;
3975 		}
3976 	}
3977 }
3978 
3979 void
3980 pcap_breakloop_common(pcap_t *p)
3981 {
3982 	p->break_loop = 1;
3983 }
3984 
3985 
3986 void
3987 pcap_cleanup_live_common(pcap_t *p)
3988 {
3989 	if (p->buffer != NULL) {
3990 		free(p->buffer);
3991 		p->buffer = NULL;
3992 	}
3993 	if (p->dlt_list != NULL) {
3994 		free(p->dlt_list);
3995 		p->dlt_list = NULL;
3996 		p->dlt_count = 0;
3997 	}
3998 	if (p->tstamp_type_list != NULL) {
3999 		free(p->tstamp_type_list);
4000 		p->tstamp_type_list = NULL;
4001 		p->tstamp_type_count = 0;
4002 	}
4003 	if (p->tstamp_precision_list != NULL) {
4004 		free(p->tstamp_precision_list);
4005 		p->tstamp_precision_list = NULL;
4006 		p->tstamp_precision_count = 0;
4007 	}
4008 	pcap_freecode(&p->fcode);
4009 #if !defined(_WIN32) && !defined(MSDOS)
4010 	if (p->fd >= 0) {
4011 		close(p->fd);
4012 		p->fd = -1;
4013 	}
4014 	p->selectable_fd = -1;
4015 #endif
4016 }
4017 
4018 /*
4019  * API compatible with WinPcap's "send a packet" routine - returns -1
4020  * on error, 0 otherwise.
4021  *
4022  * XXX - what if we get a short write?
4023  */
4024 int
4025 pcap_sendpacket(pcap_t *p, const u_char *buf, int size)
4026 {
4027 	if (size <= 0) {
4028 		pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
4029 		    errno, "The number of bytes to be sent must be positive");
4030 		return (PCAP_ERROR);
4031 	}
4032 
4033 	if (p->inject_op(p, buf, size) == -1)
4034 		return (-1);
4035 	return (0);
4036 }
4037 
4038 /*
4039  * API compatible with OpenBSD's "send a packet" routine - returns -1 on
4040  * error, number of bytes written otherwise.
4041  */
4042 int
4043 pcap_inject(pcap_t *p, const void *buf, size_t size)
4044 {
4045 	/*
4046 	 * We return the number of bytes written, so the number of
4047 	 * bytes to write must fit in an int.
4048 	 */
4049 	if (size > INT_MAX) {
4050 		pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
4051 		    errno, "More than %d bytes cannot be injected", INT_MAX);
4052 		return (PCAP_ERROR);
4053 	}
4054 
4055 	if (size == 0) {
4056 		pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
4057 		    errno, "The number of bytes to be injected must not be zero");
4058 		return (PCAP_ERROR);
4059 	}
4060 
4061 	return (p->inject_op(p, buf, (int)size));
4062 }
4063 
4064 void
4065 pcap_close(pcap_t *p)
4066 {
4067 	if (p->opt.device != NULL)
4068 		free(p->opt.device);
4069 	p->cleanup_op(p);
4070 	free(p);
4071 }
4072 
4073 /*
4074  * Helpers for safely loding code at run time.
4075  * Currently Windows-only.
4076  */
4077 #ifdef _WIN32
4078 //
4079 // This wrapper around loadlibrary appends the system folder (usually
4080 // C:\Windows\System32) to the relative path of the DLL, so that the DLL
4081 // is always loaded from an absolute path (it's no longer possible to
4082 // load modules from the application folder).
4083 // This solves the DLL Hijacking issue discovered in August 2010:
4084 //
4085 // https://blog.rapid7.com/2010/08/23/exploiting-dll-hijacking-flaws/
4086 // https://blog.rapid7.com/2010/08/23/application-dll-load-hijacking/
4087 // (the purported Rapid7 blog post link in the first of those two links
4088 // is broken; the second of those links works.)
4089 //
4090 // If any links there are broken from all the content shuffling Rapid&
4091 // did, see archived versions of the posts at their original homes, at
4092 //
4093 // https://web.archive.org/web/20110122175058/http://blog.metasploit.com/2010/08/exploiting-dll-hijacking-flaws.html
4094 // https://web.archive.org/web/20100828112111/http://blog.rapid7.com/?p=5325
4095 //
4096 pcap_code_handle_t
4097 pcap_load_code(const char *name)
4098 {
4099 	/*
4100 	 * XXX - should this work in UTF-16LE rather than in the local
4101 	 * ANSI code page?
4102 	 */
4103 	CHAR path[MAX_PATH];
4104 	CHAR fullFileName[MAX_PATH];
4105 	UINT res;
4106 	HMODULE hModule = NULL;
4107 
4108 	do
4109 	{
4110 		res = GetSystemDirectoryA(path, MAX_PATH);
4111 
4112 		if (res == 0) {
4113 			//
4114 			// some bad failure occurred;
4115 			//
4116 			break;
4117 		}
4118 
4119 		if (res > MAX_PATH) {
4120 			//
4121 			// the buffer was not big enough
4122 			//
4123 			SetLastError(ERROR_INSUFFICIENT_BUFFER);
4124 			break;
4125 		}
4126 
4127 		if (res + 1 + strlen(name) + 1 < MAX_PATH) {
4128 			memcpy(fullFileName, path, res * sizeof(TCHAR));
4129 			fullFileName[res] = '\\';
4130 			memcpy(&fullFileName[res + 1], name, (strlen(name) + 1) * sizeof(TCHAR));
4131 
4132 			hModule = LoadLibraryA(fullFileName);
4133 		} else
4134 			SetLastError(ERROR_INSUFFICIENT_BUFFER);
4135 
4136 	} while(FALSE);
4137 
4138 	return hModule;
4139 }
4140 
4141 pcap_funcptr_t
4142 pcap_find_function(pcap_code_handle_t code, const char *func)
4143 {
4144 	return (GetProcAddress(code, func));
4145 }
4146 #endif
4147 
4148 /*
4149  * Given a BPF program, a pcap_pkthdr structure for a packet, and the raw
4150  * data for the packet, check whether the packet passes the filter.
4151  * Returns the return value of the filter program, which will be zero if
4152  * the packet doesn't pass and non-zero if the packet does pass.
4153  */
4154 int
4155 pcap_offline_filter(const struct bpf_program *fp, const struct pcap_pkthdr *h,
4156     const u_char *pkt)
4157 {
4158 	const struct bpf_insn *fcode = fp->bf_insns;
4159 
4160 	if (fcode != NULL)
4161 		return (pcap_filter(fcode, pkt, h->len, h->caplen));
4162 	else
4163 		return (0);
4164 }
4165 
4166 static int
4167 pcap_can_set_rfmon_dead(pcap_t *p)
4168 {
4169 	snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
4170 	    "Rfmon mode doesn't apply on a pcap_open_dead pcap_t");
4171 	return (PCAP_ERROR);
4172 }
4173 
4174 static int
4175 pcap_read_dead(pcap_t *p, int cnt _U_, pcap_handler callback _U_,
4176     u_char *user _U_)
4177 {
4178 	snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
4179 	    "Packets aren't available from a pcap_open_dead pcap_t");
4180 	return (-1);
4181 }
4182 
4183 static int
4184 pcap_inject_dead(pcap_t *p, const void *buf _U_, int size _U_)
4185 {
4186 	snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
4187 	    "Packets can't be sent on a pcap_open_dead pcap_t");
4188 	return (-1);
4189 }
4190 
4191 static int
4192 pcap_setfilter_dead(pcap_t *p, struct bpf_program *fp _U_)
4193 {
4194 	snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
4195 	    "A filter cannot be set on a pcap_open_dead pcap_t");
4196 	return (-1);
4197 }
4198 
4199 static int
4200 pcap_setdirection_dead(pcap_t *p, pcap_direction_t d _U_)
4201 {
4202 	snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
4203 	    "The packet direction cannot be set on a pcap_open_dead pcap_t");
4204 	return (-1);
4205 }
4206 
4207 static int
4208 pcap_set_datalink_dead(pcap_t *p, int dlt _U_)
4209 {
4210 	snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
4211 	    "The link-layer header type cannot be set on a pcap_open_dead pcap_t");
4212 	return (-1);
4213 }
4214 
4215 static int
4216 pcap_getnonblock_dead(pcap_t *p)
4217 {
4218 	snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
4219 	    "A pcap_open_dead pcap_t does not have a non-blocking mode setting");
4220 	return (-1);
4221 }
4222 
4223 static int
4224 pcap_setnonblock_dead(pcap_t *p, int nonblock _U_)
4225 {
4226 	snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
4227 	    "A pcap_open_dead pcap_t does not have a non-blocking mode setting");
4228 	return (-1);
4229 }
4230 
4231 static int
4232 pcap_stats_dead(pcap_t *p, struct pcap_stat *ps _U_)
4233 {
4234 	snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
4235 	    "Statistics aren't available from a pcap_open_dead pcap_t");
4236 	return (-1);
4237 }
4238 
4239 #ifdef _WIN32
4240 static struct pcap_stat *
4241 pcap_stats_ex_dead(pcap_t *p, int *pcap_stat_size _U_)
4242 {
4243 	snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
4244 	    "Statistics aren't available from a pcap_open_dead pcap_t");
4245 	return (NULL);
4246 }
4247 
4248 static int
4249 pcap_setbuff_dead(pcap_t *p, int dim _U_)
4250 {
4251 	snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
4252 	    "The kernel buffer size cannot be set on a pcap_open_dead pcap_t");
4253 	return (-1);
4254 }
4255 
4256 static int
4257 pcap_setmode_dead(pcap_t *p, int mode _U_)
4258 {
4259 	snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
4260 	    "impossible to set mode on a pcap_open_dead pcap_t");
4261 	return (-1);
4262 }
4263 
4264 static int
4265 pcap_setmintocopy_dead(pcap_t *p, int size _U_)
4266 {
4267 	snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
4268 	    "The mintocopy parameter cannot be set on a pcap_open_dead pcap_t");
4269 	return (-1);
4270 }
4271 
4272 static HANDLE
4273 pcap_getevent_dead(pcap_t *p)
4274 {
4275 	snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
4276 	    "A pcap_open_dead pcap_t has no event handle");
4277 	return (INVALID_HANDLE_VALUE);
4278 }
4279 
4280 static int
4281 pcap_oid_get_request_dead(pcap_t *p, bpf_u_int32 oid _U_, void *data _U_,
4282     size_t *lenp _U_)
4283 {
4284 	snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
4285 	    "An OID get request cannot be performed on a pcap_open_dead pcap_t");
4286 	return (PCAP_ERROR);
4287 }
4288 
4289 static int
4290 pcap_oid_set_request_dead(pcap_t *p, bpf_u_int32 oid _U_, const void *data _U_,
4291     size_t *lenp _U_)
4292 {
4293 	snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
4294 	    "An OID set request cannot be performed on a pcap_open_dead pcap_t");
4295 	return (PCAP_ERROR);
4296 }
4297 
4298 static u_int
4299 pcap_sendqueue_transmit_dead(pcap_t *p, pcap_send_queue *queue _U_,
4300     int sync _U_)
4301 {
4302 	snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
4303 	    "Packets cannot be transmitted on a pcap_open_dead pcap_t");
4304 	return (0);
4305 }
4306 
4307 static int
4308 pcap_setuserbuffer_dead(pcap_t *p, int size _U_)
4309 {
4310 	snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
4311 	    "The user buffer cannot be set on a pcap_open_dead pcap_t");
4312 	return (-1);
4313 }
4314 
4315 static int
4316 pcap_live_dump_dead(pcap_t *p, char *filename _U_, int maxsize _U_,
4317     int maxpacks _U_)
4318 {
4319 	snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
4320 	    "Live packet dumping cannot be performed on a pcap_open_dead pcap_t");
4321 	return (-1);
4322 }
4323 
4324 static int
4325 pcap_live_dump_ended_dead(pcap_t *p, int sync _U_)
4326 {
4327 	snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
4328 	    "Live packet dumping cannot be performed on a pcap_open_dead pcap_t");
4329 	return (-1);
4330 }
4331 
4332 static PAirpcapHandle
4333 pcap_get_airpcap_handle_dead(pcap_t *p _U_)
4334 {
4335 	return (NULL);
4336 }
4337 #endif /* _WIN32 */
4338 
4339 static void
4340 pcap_cleanup_dead(pcap_t *p _U_)
4341 {
4342 	/* Nothing to do. */
4343 }
4344 
4345 pcap_t *
4346 pcap_open_dead_with_tstamp_precision(int linktype, int snaplen, u_int precision)
4347 {
4348 	pcap_t *p;
4349 
4350 	switch (precision) {
4351 
4352 	case PCAP_TSTAMP_PRECISION_MICRO:
4353 	case PCAP_TSTAMP_PRECISION_NANO:
4354 		break;
4355 
4356 	default:
4357 		/*
4358 		 * This doesn't really matter, but we don't have any way
4359 		 * to report particular errors, so the only failure we
4360 		 * should have is a memory allocation failure.  Just
4361 		 * pick microsecond precision.
4362 		 */
4363 		precision = PCAP_TSTAMP_PRECISION_MICRO;
4364 		break;
4365 	}
4366 	p = malloc(sizeof(*p));
4367 	if (p == NULL)
4368 		return NULL;
4369 	memset (p, 0, sizeof(*p));
4370 	p->snapshot = snaplen;
4371 	p->linktype = linktype;
4372 	p->opt.tstamp_precision = precision;
4373 	p->can_set_rfmon_op = pcap_can_set_rfmon_dead;
4374 	p->read_op = pcap_read_dead;
4375 	p->inject_op = pcap_inject_dead;
4376 	p->setfilter_op = pcap_setfilter_dead;
4377 	p->setdirection_op = pcap_setdirection_dead;
4378 	p->set_datalink_op = pcap_set_datalink_dead;
4379 	p->getnonblock_op = pcap_getnonblock_dead;
4380 	p->setnonblock_op = pcap_setnonblock_dead;
4381 	p->stats_op = pcap_stats_dead;
4382 #ifdef _WIN32
4383 	p->stats_ex_op = pcap_stats_ex_dead;
4384 	p->setbuff_op = pcap_setbuff_dead;
4385 	p->setmode_op = pcap_setmode_dead;
4386 	p->setmintocopy_op = pcap_setmintocopy_dead;
4387 	p->getevent_op = pcap_getevent_dead;
4388 	p->oid_get_request_op = pcap_oid_get_request_dead;
4389 	p->oid_set_request_op = pcap_oid_set_request_dead;
4390 	p->sendqueue_transmit_op = pcap_sendqueue_transmit_dead;
4391 	p->setuserbuffer_op = pcap_setuserbuffer_dead;
4392 	p->live_dump_op = pcap_live_dump_dead;
4393 	p->live_dump_ended_op = pcap_live_dump_ended_dead;
4394 	p->get_airpcap_handle_op = pcap_get_airpcap_handle_dead;
4395 #endif
4396 	p->cleanup_op = pcap_cleanup_dead;
4397 
4398 	/*
4399 	 * A "dead" pcap_t never requires special BPF code generation.
4400 	 */
4401 	p->bpf_codegen_flags = 0;
4402 
4403 	p->activated = 1;
4404 	return (p);
4405 }
4406 
4407 pcap_t *
4408 pcap_open_dead(int linktype, int snaplen)
4409 {
4410 	return (pcap_open_dead_with_tstamp_precision(linktype, snaplen,
4411 	    PCAP_TSTAMP_PRECISION_MICRO));
4412 }
4413 
4414 #ifdef YYDEBUG
4415 /*
4416  * Set the internal "debug printout" flag for the filter expression parser.
4417  * The code to print that stuff is present only if YYDEBUG is defined, so
4418  * the flag, and the routine to set it, are defined only if YYDEBUG is
4419  * defined.
4420  *
4421  * This is intended for libpcap developers, not for general use.
4422  * If you want to set these in a program, you'll have to declare this
4423  * routine yourself, with the appropriate DLL import attribute on Windows;
4424  * it's not declared in any header file, and won't be declared in any
4425  * header file provided by libpcap.
4426  */
4427 PCAP_API void pcap_set_parser_debug(int value);
4428 
4429 PCAP_API_DEF void
4430 pcap_set_parser_debug(int value)
4431 {
4432 	pcap_debug = value;
4433 }
4434 #endif
4435