2 * Copyright (c) 1993, 1994, 1995, 1996, 1997, 1998
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
35 static const char rcsid[] _U_ =
36 "@(#) $Header: /tcpdump/master/libpcap/pcap.c,v 1.128 2008-12-23 20:13:29 guy Exp $ (LBL)";
44 #include <pcap-stdinc.h>
51 #ifdef HAVE_SYS_BITYPES_H
52 #include <sys/bitypes.h>
54 #include <sys/types.h>
61 #if !defined(_MSC_VER) && !defined(__BORLANDC__) && !defined(__MINGW32__)
67 #ifdef HAVE_OS_PROTO_H
79 #endif /* HAVE_DAG_API */
81 #ifdef HAVE_SEPTEL_API
82 #include "pcap-septel.h"
83 #endif /* HAVE_SEPTEL_API */
87 #endif /* HAVE_SNF_API */
89 #ifdef PCAP_SUPPORT_USB
90 #include "pcap-usb-linux.h"
93 #ifdef PCAP_SUPPORT_BT
94 #include "pcap-bt-linux.h"
97 #ifdef PCAP_SUPPORT_CAN
98 #include "pcap-can-linux.h"
101 #ifdef PCAP_SUPPORT_CANUSB
102 #include "pcap-canusb-linux.h"
105 #ifdef PCAP_SUPPORT_NETFILTER
106 #include "pcap-netfilter-linux.h"
110 pcap_not_initialized(pcap_t *pcap)
112 /* this means 'not initialized' */
113 return (PCAP_ERROR_NOT_ACTIVATED);
117 * Returns 1 if rfmon mode can be set on the pcap_t, 0 if it can't,
118 * a PCAP_ERROR value on an error.
121 pcap_can_set_rfmon(pcap_t *p)
123 return (p->can_set_rfmon_op(p));
127 * For systems where rfmon mode is never supported.
130 pcap_cant_set_rfmon(pcap_t *p _U_)
136 * Sets *tstamp_typesp to point to an array 1 or more supported time stamp
137 * types; the return value is the number of supported time stamp types.
138 * The list should be freed by a call to pcap_free_tstamp_types() when
139 * you're done with it.
141 * A return value of 0 means "you don't get a choice of time stamp type",
142 * in which case *tstamp_typesp is set to null.
144 * PCAP_ERROR is returned on error.
147 pcap_list_tstamp_types(pcap_t *p, int **tstamp_typesp)
149 if (p->tstamp_type_count == 0) {
151 * We don't support multiple time stamp types.
153 *tstamp_typesp = NULL;
155 *tstamp_typesp = (int*)calloc(sizeof(**tstamp_typesp),
156 p->tstamp_type_count);
157 if (*tstamp_typesp == NULL) {
158 (void)snprintf(p->errbuf, sizeof(p->errbuf),
159 "malloc: %s", pcap_strerror(errno));
162 (void)memcpy(*tstamp_typesp, p->tstamp_type_list,
163 sizeof(**tstamp_typesp) * p->tstamp_type_count);
165 return (p->tstamp_type_count);
169 * In Windows, you might have a library built with one version of the
170 * C runtime library and an application built with another version of
171 * the C runtime library, which means that the library might use one
172 * version of malloc() and free() and the application might use another
173 * version of malloc() and free(). If so, that means something
174 * allocated by the library cannot be freed by the application, so we
175 * need to have a pcap_free_tstamp_types() routine to free up the list
176 * allocated by pcap_list_tstamp_types(), even though it's just a wrapper
180 pcap_free_tstamp_types(int *tstamp_type_list)
182 free(tstamp_type_list);
186 * Default one-shot callback; overridden for capture types where the
187 * packet data cannot be guaranteed to be available after the callback
188 * returns, so that a copy must be made.
191 pcap_oneshot(u_char *user, const struct pcap_pkthdr *h, const u_char *pkt)
193 struct oneshot_userdata *sp = (struct oneshot_userdata *)user;
200 pcap_next(pcap_t *p, struct pcap_pkthdr *h)
202 struct oneshot_userdata s;
208 if (pcap_dispatch(p, 1, p->oneshot_callback, (u_char *)&s) <= 0)
214 pcap_next_ex(pcap_t *p, struct pcap_pkthdr **pkt_header,
215 const u_char **pkt_data)
217 struct oneshot_userdata s;
219 s.hdr = &p->pcap_header;
223 /* Saves a pointer to the packet headers */
224 *pkt_header= &p->pcap_header;
226 if (p->sf.rfile != NULL) {
229 /* We are on an offline capture */
230 status = pcap_offline_read(p, 1, p->oneshot_callback,
234 * Return codes for pcap_offline_read() are:
238 * The first one ('0') conflicts with the return code of
239 * 0 from pcap_read() meaning "no packets arrived before
240 * the timeout expired", so we map it to -2 so you can
241 * distinguish between an EOF from a savefile and a
242 * "no packets arrived before the timeout expired, try
243 * again" from a live capture.
252 * Return codes for pcap_read() are:
255 * - -2: loop was broken out of with pcap_breakloop()
257 * The first one ('0') conflicts with the return code of 0 from
258 * pcap_offline_read() meaning "end of file".
260 return (p->read_op(p, 1, p->oneshot_callback, (u_char *)&s));
263 #if defined(DAG_ONLY)
265 pcap_findalldevs(pcap_if_t **alldevsp, char *errbuf)
267 return (dag_findalldevs(alldevsp, errbuf));
271 pcap_create(const char *source, char *errbuf)
273 return (dag_create(source, errbuf));
275 #elif defined(SEPTEL_ONLY)
277 pcap_findalldevs(pcap_if_t **alldevsp, char *errbuf)
279 return (septel_findalldevs(alldevsp, errbuf));
283 pcap_create(const char *source, char *errbuf)
285 return (septel_create(source, errbuf));
287 #elif defined(SNF_ONLY)
289 pcap_findalldevs(pcap_if_t **alldevsp, char *errbuf)
291 return (snf_findalldevs(alldevsp, errbuf));
295 pcap_create(const char *source, char *errbuf)
297 return (snf_create(source, errbuf));
299 #else /* regular pcap */
300 struct capture_source_type {
301 int (*findalldevs_op)(pcap_if_t **, char *);
302 pcap_t *(*create_op)(const char *, char *, int *);
303 } capture_source_types[] = {
305 { dag_findalldevs, dag_create },
307 #ifdef HAVE_SEPTEL_API
308 { septel_findalldevs, septel_create },
311 { snf_findalldevs, snf_create },
313 #ifdef PCAP_SUPPORT_BT
314 { bt_findalldevs, bt_create },
316 #if PCAP_SUPPORT_CANUSB
317 { canusb_findalldevs, canusb_create },
319 #ifdef PCAP_SUPPORT_CAN
320 { can_findalldevs, can_create },
322 #ifdef PCAP_SUPPORT_USB
323 { usb_findalldevs, usb_create },
325 #ifdef PCAP_SUPPORT_NETFILTER
326 { netfilter_findalldevs, netfilter_create },
332 * Get a list of all capture sources that are up and that we can open.
333 * Returns -1 on error, 0 otherwise.
334 * The list, as returned through "alldevsp", may be null if no interfaces
335 * were up and could be opened.
338 pcap_findalldevs(pcap_if_t **alldevsp, char *errbuf)
343 * Get the list of regular interfaces first.
345 if (pcap_findalldevs_interfaces(alldevsp, errbuf) == -1)
346 return (-1); /* failure */
349 * Add any interfaces that need a platform-specific mechanism
352 if (pcap_platform_finddevs(alldevsp, errbuf) == -1) {
354 * We had an error; free the list we've been
357 if (*alldevsp != NULL) {
358 pcap_freealldevs(*alldevsp);
365 * Ask each of the non-local-network-interface capture
366 * source types what interfaces they have.
368 for (i = 0; capture_source_types[i].findalldevs_op != NULL; i++) {
369 if (capture_source_types[i].findalldevs_op(alldevsp, errbuf) == -1) {
371 * We had an error; free the list we've been
374 if (*alldevsp != NULL) {
375 pcap_freealldevs(*alldevsp);
385 pcap_create(const char *source, char *errbuf)
392 * A null source name is equivalent to the "any" device -
393 * which might not be supported on this platform, but
394 * this means that you'll get a "not supported" error
395 * rather than, say, a crash when we try to dereference
402 * Try each of the non-local-network-interface capture
403 * source types until we find one that works for this
404 * device or run out of types.
406 for (i = 0; capture_source_types[i].create_op != NULL; i++) {
408 p = capture_source_types[i].create_op(source, errbuf, &is_theirs);
411 * The device name refers to a device of the
412 * type in question; either it succeeded,
413 * in which case p refers to a pcap_t to
414 * later activate for the device, or it
415 * failed, in which case p is null and we
416 * should return that to report the failure
424 * OK, try it as a regular network interface.
426 return (pcap_create_interface(source, errbuf));
431 initialize_ops(pcap_t *p)
434 * Set operation pointers for operations that only work on
435 * an activated pcap_t to point to a routine that returns
436 * a "this isn't activated" error.
438 p->read_op = (read_op_t)pcap_not_initialized;
439 p->inject_op = (inject_op_t)pcap_not_initialized;
440 p->setfilter_op = (setfilter_op_t)pcap_not_initialized;
441 p->setdirection_op = (setdirection_op_t)pcap_not_initialized;
442 p->set_datalink_op = (set_datalink_op_t)pcap_not_initialized;
443 p->getnonblock_op = (getnonblock_op_t)pcap_not_initialized;
444 p->setnonblock_op = (setnonblock_op_t)pcap_not_initialized;
445 p->stats_op = (stats_op_t)pcap_not_initialized;
447 p->setbuff_op = (setbuff_op_t)pcap_not_initialized;
448 p->setmode_op = (setmode_op_t)pcap_not_initialized;
449 p->setmintocopy_op = (setmintocopy_op_t)pcap_not_initialized;
453 * Default cleanup operation - implementations can override
454 * this, but should call pcap_cleanup_live_common() after
455 * doing their own additional cleanup.
457 p->cleanup_op = pcap_cleanup_live_common;
460 * In most cases, the standard one-short callback can
461 * be used for pcap_next()/pcap_next_ex().
463 p->oneshot_callback = pcap_oneshot;
467 pcap_create_common(const char *source, char *ebuf)
471 p = malloc(sizeof(*p));
473 snprintf(ebuf, PCAP_ERRBUF_SIZE, "malloc: %s",
474 pcap_strerror(errno));
477 memset(p, 0, sizeof(*p));
479 p->fd = -1; /* not opened yet */
480 p->selectable_fd = -1;
484 p->opt.source = strdup(source);
485 if (p->opt.source == NULL) {
486 snprintf(ebuf, PCAP_ERRBUF_SIZE, "malloc: %s",
487 pcap_strerror(errno));
493 * Default to "can't set rfmon mode"; if it's supported by
494 * a platform, the create routine that called us can set
495 * the op to its routine to check whether a particular
496 * device supports it.
498 p->can_set_rfmon_op = pcap_cant_set_rfmon;
502 /* put in some defaults*/
503 pcap_set_timeout(p, 0);
504 pcap_set_snaplen(p, 65535); /* max packet size */
506 p->opt.buffer_size = 0;
507 p->opt.tstamp_type = -1; /* default to not setting time stamp type */
512 pcap_check_activated(pcap_t *p)
515 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "can't perform "
516 " operation on activated capture");
523 pcap_set_snaplen(pcap_t *p, int snaplen)
525 if (pcap_check_activated(p))
526 return (PCAP_ERROR_ACTIVATED);
527 p->snapshot = snaplen;
532 pcap_set_promisc(pcap_t *p, int promisc)
534 if (pcap_check_activated(p))
535 return (PCAP_ERROR_ACTIVATED);
536 p->opt.promisc = promisc;
541 pcap_set_rfmon(pcap_t *p, int rfmon)
543 if (pcap_check_activated(p))
544 return (PCAP_ERROR_ACTIVATED);
545 p->opt.rfmon = rfmon;
550 pcap_set_timeout(pcap_t *p, int timeout_ms)
552 if (pcap_check_activated(p))
553 return (PCAP_ERROR_ACTIVATED);
554 p->md.timeout = timeout_ms;
559 pcap_set_tstamp_type(pcap_t *p, int tstamp_type)
563 if (pcap_check_activated(p))
564 return (PCAP_ERROR_ACTIVATED);
567 * If p->tstamp_type_count is 0, we don't support setting
568 * the time stamp type at all.
570 if (p->tstamp_type_count == 0)
571 return (PCAP_ERROR_CANTSET_TSTAMP_TYPE);
574 * Check whether we claim to support this type of time stamp.
576 for (i = 0; i < p->tstamp_type_count; i++) {
577 if (p->tstamp_type_list[i] == tstamp_type) {
581 p->opt.tstamp_type = tstamp_type;
587 * No. We support setting the time stamp type, but not to this
590 return (PCAP_WARNING_TSTAMP_TYPE_NOTSUP);
594 pcap_set_buffer_size(pcap_t *p, int buffer_size)
596 if (pcap_check_activated(p))
597 return (PCAP_ERROR_ACTIVATED);
598 p->opt.buffer_size = buffer_size;
603 pcap_activate(pcap_t *p)
608 * Catch attempts to re-activate an already-activated
609 * pcap_t; this should, for example, catch code that
610 * calls pcap_open_live() followed by pcap_activate(),
611 * as some code that showed up in a Stack Exchange
614 if (pcap_check_activated(p))
615 return (PCAP_ERROR_ACTIVATED);
616 status = p->activate_op(p);
620 if (p->errbuf[0] == '\0') {
622 * No error message supplied by the activate routine;
623 * for the benefit of programs that don't specially
624 * handle errors other than PCAP_ERROR, return the
625 * error message corresponding to the status.
627 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "%s",
628 pcap_statustostr(status));
632 * Undo any operation pointer setting, etc. done by
633 * the activate operation.
641 pcap_open_live(const char *source, int snaplen, int promisc, int to_ms, char *errbuf)
646 p = pcap_create(source, errbuf);
649 status = pcap_set_snaplen(p, snaplen);
652 status = pcap_set_promisc(p, promisc);
655 status = pcap_set_timeout(p, to_ms);
659 * Mark this as opened with pcap_open_live(), so that, for
660 * example, we show the full list of DLT_ values, rather
661 * than just the ones that are compatible with capturing
662 * when not in monitor mode. That allows existing applications
663 * to work the way they used to work, but allows new applications
664 * that know about the new open API to, for example, find out the
665 * DLT_ values that they can select without changing whether
666 * the adapter is in monitor mode or not.
669 status = pcap_activate(p);
674 if (status == PCAP_ERROR)
675 snprintf(errbuf, PCAP_ERRBUF_SIZE, "%s: %s", source,
677 else if (status == PCAP_ERROR_NO_SUCH_DEVICE ||
678 status == PCAP_ERROR_PERM_DENIED ||
679 status == PCAP_ERROR_PROMISC_PERM_DENIED)
680 snprintf(errbuf, PCAP_ERRBUF_SIZE, "%s: %s (%s)", source,
681 pcap_statustostr(status), p->errbuf);
683 snprintf(errbuf, PCAP_ERRBUF_SIZE, "%s: %s", source,
684 pcap_statustostr(status));
690 pcap_dispatch(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
692 return (p->read_op(p, cnt, callback, user));
696 * XXX - is this necessary?
699 pcap_read(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
702 return (p->read_op(p, cnt, callback, user));
706 pcap_loop(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
711 if (p->sf.rfile != NULL) {
713 * 0 means EOF, so don't loop if we get 0.
715 n = pcap_offline_read(p, cnt, callback, user);
718 * XXX keep reading until we get something
719 * (or an error occurs)
722 n = p->read_op(p, cnt, callback, user);
736 * Force the loop in "pcap_read()" or "pcap_read_offline()" to terminate.
739 pcap_breakloop(pcap_t *p)
745 pcap_datalink(pcap_t *p)
747 return (p->linktype);
751 pcap_datalink_ext(pcap_t *p)
753 return (p->linktype_ext);
757 pcap_list_datalinks(pcap_t *p, int **dlt_buffer)
759 if (p->dlt_count == 0) {
761 * We couldn't fetch the list of DLTs, which means
762 * this platform doesn't support changing the
763 * DLT for an interface. Return a list of DLTs
764 * containing only the DLT this device supports.
766 *dlt_buffer = (int*)malloc(sizeof(**dlt_buffer));
767 if (*dlt_buffer == NULL) {
768 (void)snprintf(p->errbuf, sizeof(p->errbuf),
769 "malloc: %s", pcap_strerror(errno));
772 **dlt_buffer = p->linktype;
775 *dlt_buffer = (int*)calloc(sizeof(**dlt_buffer), p->dlt_count);
776 if (*dlt_buffer == NULL) {
777 (void)snprintf(p->errbuf, sizeof(p->errbuf),
778 "malloc: %s", pcap_strerror(errno));
781 (void)memcpy(*dlt_buffer, p->dlt_list,
782 sizeof(**dlt_buffer) * p->dlt_count);
783 return (p->dlt_count);
788 * In Windows, you might have a library built with one version of the
789 * C runtime library and an application built with another version of
790 * the C runtime library, which means that the library might use one
791 * version of malloc() and free() and the application might use another
792 * version of malloc() and free(). If so, that means something
793 * allocated by the library cannot be freed by the application, so we
794 * need to have a pcap_free_datalinks() routine to free up the list
795 * allocated by pcap_list_datalinks(), even though it's just a wrapper
799 pcap_free_datalinks(int *dlt_list)
805 pcap_set_datalink(pcap_t *p, int dlt)
808 const char *dlt_name;
810 if (p->dlt_count == 0 || p->set_datalink_op == NULL) {
812 * We couldn't fetch the list of DLTs, or we don't
813 * have a "set datalink" operation, which means
814 * this platform doesn't support changing the
815 * DLT for an interface. Check whether the new
816 * DLT is the one this interface supports.
818 if (p->linktype != dlt)
822 * It is, so there's nothing we need to do here.
826 for (i = 0; i < p->dlt_count; i++)
827 if (p->dlt_list[i] == dlt)
829 if (i >= p->dlt_count)
831 if (p->dlt_count == 2 && p->dlt_list[0] == DLT_EN10MB &&
834 * This is presumably an Ethernet device, as the first
835 * link-layer type it offers is DLT_EN10MB, and the only
836 * other type it offers is DLT_DOCSIS. That means that
837 * we can't tell the driver to supply DOCSIS link-layer
838 * headers - we're just pretending that's what we're
839 * getting, as, presumably, we're capturing on a dedicated
840 * link to a Cisco Cable Modem Termination System, and
841 * it's putting raw DOCSIS frames on the wire inside low-level
847 if (p->set_datalink_op(p, dlt) == -1)
853 dlt_name = pcap_datalink_val_to_name(dlt);
854 if (dlt_name != NULL) {
855 (void) snprintf(p->errbuf, sizeof(p->errbuf),
856 "%s is not one of the DLTs supported by this device",
859 (void) snprintf(p->errbuf, sizeof(p->errbuf),
860 "DLT %d is not one of the DLTs supported by this device",
867 * This array is designed for mapping upper and lower case letter
868 * together for a case independent comparison. The mappings are
869 * based upon ascii character sequences.
871 static const u_char charmap[] = {
872 (u_char)'\000', (u_char)'\001', (u_char)'\002', (u_char)'\003',
873 (u_char)'\004', (u_char)'\005', (u_char)'\006', (u_char)'\007',
874 (u_char)'\010', (u_char)'\011', (u_char)'\012', (u_char)'\013',
875 (u_char)'\014', (u_char)'\015', (u_char)'\016', (u_char)'\017',
876 (u_char)'\020', (u_char)'\021', (u_char)'\022', (u_char)'\023',
877 (u_char)'\024', (u_char)'\025', (u_char)'\026', (u_char)'\027',
878 (u_char)'\030', (u_char)'\031', (u_char)'\032', (u_char)'\033',
879 (u_char)'\034', (u_char)'\035', (u_char)'\036', (u_char)'\037',
880 (u_char)'\040', (u_char)'\041', (u_char)'\042', (u_char)'\043',
881 (u_char)'\044', (u_char)'\045', (u_char)'\046', (u_char)'\047',
882 (u_char)'\050', (u_char)'\051', (u_char)'\052', (u_char)'\053',
883 (u_char)'\054', (u_char)'\055', (u_char)'\056', (u_char)'\057',
884 (u_char)'\060', (u_char)'\061', (u_char)'\062', (u_char)'\063',
885 (u_char)'\064', (u_char)'\065', (u_char)'\066', (u_char)'\067',
886 (u_char)'\070', (u_char)'\071', (u_char)'\072', (u_char)'\073',
887 (u_char)'\074', (u_char)'\075', (u_char)'\076', (u_char)'\077',
888 (u_char)'\100', (u_char)'\141', (u_char)'\142', (u_char)'\143',
889 (u_char)'\144', (u_char)'\145', (u_char)'\146', (u_char)'\147',
890 (u_char)'\150', (u_char)'\151', (u_char)'\152', (u_char)'\153',
891 (u_char)'\154', (u_char)'\155', (u_char)'\156', (u_char)'\157',
892 (u_char)'\160', (u_char)'\161', (u_char)'\162', (u_char)'\163',
893 (u_char)'\164', (u_char)'\165', (u_char)'\166', (u_char)'\167',
894 (u_char)'\170', (u_char)'\171', (u_char)'\172', (u_char)'\133',
895 (u_char)'\134', (u_char)'\135', (u_char)'\136', (u_char)'\137',
896 (u_char)'\140', (u_char)'\141', (u_char)'\142', (u_char)'\143',
897 (u_char)'\144', (u_char)'\145', (u_char)'\146', (u_char)'\147',
898 (u_char)'\150', (u_char)'\151', (u_char)'\152', (u_char)'\153',
899 (u_char)'\154', (u_char)'\155', (u_char)'\156', (u_char)'\157',
900 (u_char)'\160', (u_char)'\161', (u_char)'\162', (u_char)'\163',
901 (u_char)'\164', (u_char)'\165', (u_char)'\166', (u_char)'\167',
902 (u_char)'\170', (u_char)'\171', (u_char)'\172', (u_char)'\173',
903 (u_char)'\174', (u_char)'\175', (u_char)'\176', (u_char)'\177',
904 (u_char)'\200', (u_char)'\201', (u_char)'\202', (u_char)'\203',
905 (u_char)'\204', (u_char)'\205', (u_char)'\206', (u_char)'\207',
906 (u_char)'\210', (u_char)'\211', (u_char)'\212', (u_char)'\213',
907 (u_char)'\214', (u_char)'\215', (u_char)'\216', (u_char)'\217',
908 (u_char)'\220', (u_char)'\221', (u_char)'\222', (u_char)'\223',
909 (u_char)'\224', (u_char)'\225', (u_char)'\226', (u_char)'\227',
910 (u_char)'\230', (u_char)'\231', (u_char)'\232', (u_char)'\233',
911 (u_char)'\234', (u_char)'\235', (u_char)'\236', (u_char)'\237',
912 (u_char)'\240', (u_char)'\241', (u_char)'\242', (u_char)'\243',
913 (u_char)'\244', (u_char)'\245', (u_char)'\246', (u_char)'\247',
914 (u_char)'\250', (u_char)'\251', (u_char)'\252', (u_char)'\253',
915 (u_char)'\254', (u_char)'\255', (u_char)'\256', (u_char)'\257',
916 (u_char)'\260', (u_char)'\261', (u_char)'\262', (u_char)'\263',
917 (u_char)'\264', (u_char)'\265', (u_char)'\266', (u_char)'\267',
918 (u_char)'\270', (u_char)'\271', (u_char)'\272', (u_char)'\273',
919 (u_char)'\274', (u_char)'\275', (u_char)'\276', (u_char)'\277',
920 (u_char)'\300', (u_char)'\341', (u_char)'\342', (u_char)'\343',
921 (u_char)'\344', (u_char)'\345', (u_char)'\346', (u_char)'\347',
922 (u_char)'\350', (u_char)'\351', (u_char)'\352', (u_char)'\353',
923 (u_char)'\354', (u_char)'\355', (u_char)'\356', (u_char)'\357',
924 (u_char)'\360', (u_char)'\361', (u_char)'\362', (u_char)'\363',
925 (u_char)'\364', (u_char)'\365', (u_char)'\366', (u_char)'\367',
926 (u_char)'\370', (u_char)'\371', (u_char)'\372', (u_char)'\333',
927 (u_char)'\334', (u_char)'\335', (u_char)'\336', (u_char)'\337',
928 (u_char)'\340', (u_char)'\341', (u_char)'\342', (u_char)'\343',
929 (u_char)'\344', (u_char)'\345', (u_char)'\346', (u_char)'\347',
930 (u_char)'\350', (u_char)'\351', (u_char)'\352', (u_char)'\353',
931 (u_char)'\354', (u_char)'\355', (u_char)'\356', (u_char)'\357',
932 (u_char)'\360', (u_char)'\361', (u_char)'\362', (u_char)'\363',
933 (u_char)'\364', (u_char)'\365', (u_char)'\366', (u_char)'\367',
934 (u_char)'\370', (u_char)'\371', (u_char)'\372', (u_char)'\373',
935 (u_char)'\374', (u_char)'\375', (u_char)'\376', (u_char)'\377',
939 pcap_strcasecmp(const char *s1, const char *s2)
941 register const u_char *cm = charmap,
942 *us1 = (const u_char *)s1,
943 *us2 = (const u_char *)s2;
945 while (cm[*us1] == cm[*us2++])
948 return (cm[*us1] - cm[*--us2]);
953 const char *description;
957 #define DLT_CHOICE(code, description) { #code, description, code }
958 #define DLT_CHOICE_SENTINEL { NULL, NULL, 0 }
960 static struct dlt_choice dlt_choices[] = {
961 DLT_CHOICE(DLT_NULL, "BSD loopback"),
962 DLT_CHOICE(DLT_EN10MB, "Ethernet"),
963 DLT_CHOICE(DLT_IEEE802, "Token ring"),
964 DLT_CHOICE(DLT_ARCNET, "BSD ARCNET"),
965 DLT_CHOICE(DLT_SLIP, "SLIP"),
966 DLT_CHOICE(DLT_PPP, "PPP"),
967 DLT_CHOICE(DLT_FDDI, "FDDI"),
968 DLT_CHOICE(DLT_ATM_RFC1483, "RFC 1483 LLC-encapsulated ATM"),
969 DLT_CHOICE(DLT_RAW, "Raw IP"),
970 DLT_CHOICE(DLT_SLIP_BSDOS, "BSD/OS SLIP"),
971 DLT_CHOICE(DLT_PPP_BSDOS, "BSD/OS PPP"),
972 DLT_CHOICE(DLT_ATM_CLIP, "Linux Classical IP-over-ATM"),
973 DLT_CHOICE(DLT_PPP_SERIAL, "PPP over serial"),
974 DLT_CHOICE(DLT_PPP_ETHER, "PPPoE"),
975 DLT_CHOICE(DLT_SYMANTEC_FIREWALL, "Symantec Firewall"),
976 DLT_CHOICE(DLT_C_HDLC, "Cisco HDLC"),
977 DLT_CHOICE(DLT_IEEE802_11, "802.11"),
978 DLT_CHOICE(DLT_FRELAY, "Frame Relay"),
979 DLT_CHOICE(DLT_LOOP, "OpenBSD loopback"),
980 DLT_CHOICE(DLT_ENC, "OpenBSD encapsulated IP"),
981 DLT_CHOICE(DLT_LINUX_SLL, "Linux cooked"),
982 DLT_CHOICE(DLT_LTALK, "Localtalk"),
983 DLT_CHOICE(DLT_PFLOG, "OpenBSD pflog file"),
984 DLT_CHOICE(DLT_PFSYNC, "Packet filter state syncing"),
985 DLT_CHOICE(DLT_PRISM_HEADER, "802.11 plus Prism header"),
986 DLT_CHOICE(DLT_IP_OVER_FC, "RFC 2625 IP-over-Fibre Channel"),
987 DLT_CHOICE(DLT_SUNATM, "Sun raw ATM"),
988 DLT_CHOICE(DLT_IEEE802_11_RADIO, "802.11 plus radiotap header"),
989 DLT_CHOICE(DLT_ARCNET_LINUX, "Linux ARCNET"),
990 DLT_CHOICE(DLT_JUNIPER_MLPPP, "Juniper Multi-Link PPP"),
991 DLT_CHOICE(DLT_JUNIPER_MLFR, "Juniper Multi-Link Frame Relay"),
992 DLT_CHOICE(DLT_JUNIPER_ES, "Juniper Encryption Services PIC"),
993 DLT_CHOICE(DLT_JUNIPER_GGSN, "Juniper GGSN PIC"),
994 DLT_CHOICE(DLT_JUNIPER_MFR, "Juniper FRF.16 Frame Relay"),
995 DLT_CHOICE(DLT_JUNIPER_ATM2, "Juniper ATM2 PIC"),
996 DLT_CHOICE(DLT_JUNIPER_SERVICES, "Juniper Advanced Services PIC"),
997 DLT_CHOICE(DLT_JUNIPER_ATM1, "Juniper ATM1 PIC"),
998 DLT_CHOICE(DLT_APPLE_IP_OVER_IEEE1394, "Apple IP-over-IEEE 1394"),
999 DLT_CHOICE(DLT_MTP2_WITH_PHDR, "SS7 MTP2 with Pseudo-header"),
1000 DLT_CHOICE(DLT_MTP2, "SS7 MTP2"),
1001 DLT_CHOICE(DLT_MTP3, "SS7 MTP3"),
1002 DLT_CHOICE(DLT_SCCP, "SS7 SCCP"),
1003 DLT_CHOICE(DLT_DOCSIS, "DOCSIS"),
1004 DLT_CHOICE(DLT_LINUX_IRDA, "Linux IrDA"),
1005 DLT_CHOICE(DLT_IEEE802_11_RADIO_AVS, "802.11 plus AVS radio information header"),
1006 DLT_CHOICE(DLT_JUNIPER_MONITOR, "Juniper Passive Monitor PIC"),
1007 DLT_CHOICE(DLT_PPP_PPPD, "PPP for pppd, with direction flag"),
1008 DLT_CHOICE(DLT_JUNIPER_PPPOE, "Juniper PPPoE"),
1009 DLT_CHOICE(DLT_JUNIPER_PPPOE_ATM, "Juniper PPPoE/ATM"),
1010 DLT_CHOICE(DLT_GPRS_LLC, "GPRS LLC"),
1011 DLT_CHOICE(DLT_GPF_T, "GPF-T"),
1012 DLT_CHOICE(DLT_GPF_F, "GPF-F"),
1013 DLT_CHOICE(DLT_JUNIPER_PIC_PEER, "Juniper PIC Peer"),
1014 DLT_CHOICE(DLT_ERF_ETH, "Ethernet with Endace ERF header"),
1015 DLT_CHOICE(DLT_ERF_POS, "Packet-over-SONET with Endace ERF header"),
1016 DLT_CHOICE(DLT_LINUX_LAPD, "Linux vISDN LAPD"),
1017 DLT_CHOICE(DLT_JUNIPER_ETHER, "Juniper Ethernet"),
1018 DLT_CHOICE(DLT_JUNIPER_PPP, "Juniper PPP"),
1019 DLT_CHOICE(DLT_JUNIPER_FRELAY, "Juniper Frame Relay"),
1020 DLT_CHOICE(DLT_JUNIPER_CHDLC, "Juniper C-HDLC"),
1021 DLT_CHOICE(DLT_MFR, "FRF.16 Frame Relay"),
1022 DLT_CHOICE(DLT_JUNIPER_VP, "Juniper Voice PIC"),
1023 DLT_CHOICE(DLT_A429, "Arinc 429"),
1024 DLT_CHOICE(DLT_A653_ICM, "Arinc 653 Interpartition Communication"),
1025 DLT_CHOICE(DLT_USB, "USB"),
1026 DLT_CHOICE(DLT_BLUETOOTH_HCI_H4, "Bluetooth HCI UART transport layer"),
1027 DLT_CHOICE(DLT_IEEE802_16_MAC_CPS, "IEEE 802.16 MAC Common Part Sublayer"),
1028 DLT_CHOICE(DLT_USB_LINUX, "USB with Linux header"),
1029 DLT_CHOICE(DLT_CAN20B, "Controller Area Network (CAN) v. 2.0B"),
1030 DLT_CHOICE(DLT_IEEE802_15_4_LINUX, "IEEE 802.15.4 with Linux padding"),
1031 DLT_CHOICE(DLT_PPI, "Per-Packet Information"),
1032 DLT_CHOICE(DLT_IEEE802_16_MAC_CPS_RADIO, "IEEE 802.16 MAC Common Part Sublayer plus radiotap header"),
1033 DLT_CHOICE(DLT_JUNIPER_ISM, "Juniper Integrated Service Module"),
1034 DLT_CHOICE(DLT_IEEE802_15_4, "IEEE 802.15.4 with FCS"),
1035 DLT_CHOICE(DLT_SITA, "SITA pseudo-header"),
1036 DLT_CHOICE(DLT_ERF, "Endace ERF header"),
1037 DLT_CHOICE(DLT_RAIF1, "Ethernet with u10 Networks pseudo-header"),
1038 DLT_CHOICE(DLT_IPMB, "IPMB"),
1039 DLT_CHOICE(DLT_JUNIPER_ST, "Juniper Secure Tunnel"),
1040 DLT_CHOICE(DLT_BLUETOOTH_HCI_H4_WITH_PHDR, "Bluetooth HCI UART transport layer plus pseudo-header"),
1041 DLT_CHOICE(DLT_AX25_KISS, "AX.25 with KISS header"),
1042 DLT_CHOICE(DLT_IEEE802_15_4_NONASK_PHY, "IEEE 802.15.4 with non-ASK PHY data"),
1043 DLT_CHOICE(DLT_MPLS, "MPLS with label as link-layer header"),
1044 DLT_CHOICE(DLT_USB_LINUX_MMAPPED, "USB with padded Linux header"),
1045 DLT_CHOICE(DLT_DECT, "DECT"),
1046 DLT_CHOICE(DLT_AOS, "AOS Space Data Link protocol"),
1047 DLT_CHOICE(DLT_WIHART, "Wireless HART"),
1048 DLT_CHOICE(DLT_FC_2, "Fibre Channel FC-2"),
1049 DLT_CHOICE(DLT_FC_2_WITH_FRAME_DELIMS, "Fibre Channel FC-2 with frame delimiters"),
1050 DLT_CHOICE(DLT_IPNET, "Solaris ipnet"),
1051 DLT_CHOICE(DLT_CAN_SOCKETCAN, "CAN-bus with SocketCAN headers"),
1052 DLT_CHOICE(DLT_IPV4, "Raw IPv4"),
1053 DLT_CHOICE(DLT_IPV6, "Raw IPv6"),
1054 DLT_CHOICE(DLT_IEEE802_15_4_NOFCS, "IEEE 802.15.4 without FCS"),
1055 DLT_CHOICE(DLT_JUNIPER_VS, "Juniper Virtual Server"),
1056 DLT_CHOICE(DLT_JUNIPER_SRX_E2E, "Juniper SRX E2E"),
1057 DLT_CHOICE(DLT_JUNIPER_FIBRECHANNEL, "Juniper Fibre Channel"),
1058 DLT_CHOICE(DLT_DVB_CI, "DVB-CI"),
1059 DLT_CHOICE(DLT_JUNIPER_ATM_CEMIC, "Juniper ATM CEMIC"),
1060 DLT_CHOICE(DLT_NFLOG, "Linux netfilter log messages"),
1061 DLT_CHOICE(DLT_NETANALYZER, "Ethernet with Hilscher netANALYZER pseudo-header"),
1062 DLT_CHOICE(DLT_NETANALYZER_TRANSPARENT, "Ethernet with Hilscher netANALYZER pseudo-header and with preamble and SFD"),
1063 DLT_CHOICE(DLT_IPOIB, "RFC 4391 IP-over-Infiniband"),
1068 pcap_datalink_name_to_val(const char *name)
1072 for (i = 0; dlt_choices[i].name != NULL; i++) {
1073 if (pcap_strcasecmp(dlt_choices[i].name + sizeof("DLT_") - 1,
1075 return (dlt_choices[i].dlt);
1081 pcap_datalink_val_to_name(int dlt)
1085 for (i = 0; dlt_choices[i].name != NULL; i++) {
1086 if (dlt_choices[i].dlt == dlt)
1087 return (dlt_choices[i].name + sizeof("DLT_") - 1);
1093 pcap_datalink_val_to_description(int dlt)
1097 for (i = 0; dlt_choices[i].name != NULL; i++) {
1098 if (dlt_choices[i].dlt == dlt)
1099 return (dlt_choices[i].description);
1104 struct tstamp_type_choice {
1106 const char *description;
1110 static struct tstamp_type_choice tstamp_type_choices[] = {
1111 { "host", "Host", PCAP_TSTAMP_HOST },
1112 { "host_lowprec", "Host, low precision", PCAP_TSTAMP_HOST_LOWPREC },
1113 { "host_hiprec", "Host, high precision", PCAP_TSTAMP_HOST_HIPREC },
1114 { "adapter", "Adapter", PCAP_TSTAMP_ADAPTER },
1115 { "adapter_unsynced", "Adapter, not synced with system time", PCAP_TSTAMP_ADAPTER_UNSYNCED },
1120 pcap_tstamp_type_name_to_val(const char *name)
1124 for (i = 0; tstamp_type_choices[i].name != NULL; i++) {
1125 if (pcap_strcasecmp(tstamp_type_choices[i].name, name) == 0)
1126 return (tstamp_type_choices[i].type);
1128 return (PCAP_ERROR);
1132 pcap_tstamp_type_val_to_name(int tstamp_type)
1136 for (i = 0; tstamp_type_choices[i].name != NULL; i++) {
1137 if (tstamp_type_choices[i].type == tstamp_type)
1138 return (tstamp_type_choices[i].name);
1144 pcap_tstamp_type_val_to_description(int tstamp_type)
1148 for (i = 0; tstamp_type_choices[i].name != NULL; i++) {
1149 if (tstamp_type_choices[i].type == tstamp_type)
1150 return (tstamp_type_choices[i].description);
1156 pcap_snapshot(pcap_t *p)
1158 return (p->snapshot);
1162 pcap_is_swapped(pcap_t *p)
1164 return (p->sf.swapped);
1168 pcap_major_version(pcap_t *p)
1170 return (p->sf.version_major);
1174 pcap_minor_version(pcap_t *p)
1176 return (p->sf.version_minor);
1180 pcap_file(pcap_t *p)
1182 return (p->sf.rfile);
1186 pcap_fileno(pcap_t *p)
1191 if (p->adapter != NULL)
1192 return ((int)(DWORD)p->adapter->hFile);
1198 #if !defined(WIN32) && !defined(MSDOS)
1200 pcap_get_selectable_fd(pcap_t *p)
1202 return (p->selectable_fd);
1207 pcap_perror(pcap_t *p, char *prefix)
1209 fprintf(stderr, "%s: %s\n", prefix, p->errbuf);
1213 pcap_geterr(pcap_t *p)
1219 pcap_getnonblock(pcap_t *p, char *errbuf)
1223 ret = p->getnonblock_op(p, errbuf);
1226 * In case somebody depended on the bug wherein
1227 * the error message was put into p->errbuf
1228 * by pcap_getnonblock_fd().
1230 strlcpy(p->errbuf, errbuf, PCAP_ERRBUF_SIZE);
1236 * Get the current non-blocking mode setting, under the assumption that
1237 * it's just the standard POSIX non-blocking flag.
1239 * We don't look at "p->nonblock", in case somebody tweaked the FD
1242 #if !defined(WIN32) && !defined(MSDOS)
1244 pcap_getnonblock_fd(pcap_t *p, char *errbuf)
1248 fdflags = fcntl(p->fd, F_GETFL, 0);
1249 if (fdflags == -1) {
1250 snprintf(errbuf, PCAP_ERRBUF_SIZE, "F_GETFL: %s",
1251 pcap_strerror(errno));
1254 if (fdflags & O_NONBLOCK)
1262 pcap_setnonblock(pcap_t *p, int nonblock, char *errbuf)
1266 ret = p->setnonblock_op(p, nonblock, errbuf);
1269 * In case somebody depended on the bug wherein
1270 * the error message was put into p->errbuf
1271 * by pcap_setnonblock_fd().
1273 strlcpy(p->errbuf, errbuf, PCAP_ERRBUF_SIZE);
1278 #if !defined(WIN32) && !defined(MSDOS)
1280 * Set non-blocking mode, under the assumption that it's just the
1281 * standard POSIX non-blocking flag. (This can be called by the
1282 * per-platform non-blocking-mode routine if that routine also
1283 * needs to do some additional work.)
1286 pcap_setnonblock_fd(pcap_t *p, int nonblock, char *errbuf)
1290 fdflags = fcntl(p->fd, F_GETFL, 0);
1291 if (fdflags == -1) {
1292 snprintf(errbuf, PCAP_ERRBUF_SIZE, "F_GETFL: %s",
1293 pcap_strerror(errno));
1297 fdflags |= O_NONBLOCK;
1299 fdflags &= ~O_NONBLOCK;
1300 if (fcntl(p->fd, F_SETFL, fdflags) == -1) {
1301 snprintf(errbuf, PCAP_ERRBUF_SIZE, "F_SETFL: %s",
1302 pcap_strerror(errno));
1311 * Generate a string for the last Win32-specific error (i.e. an error generated when
1312 * calling a Win32 API).
1313 * For errors occurred during standard C calls, we still use pcap_strerror()
1316 pcap_win32strerror(void)
1319 static char errbuf[PCAP_ERRBUF_SIZE+1];
1323 error = GetLastError();
1324 FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, NULL, error, 0, errbuf,
1325 PCAP_ERRBUF_SIZE, NULL);
1328 * "FormatMessage()" "helpfully" sticks CR/LF at the end of the
1329 * message. Get rid of it.
1331 errlen = strlen(errbuf);
1333 errbuf[errlen - 1] = '\0';
1334 errbuf[errlen - 2] = '\0';
1336 p = strchr(errbuf, '\0');
1337 snprintf (p, sizeof(errbuf)-(p-errbuf), " (%lu)", error);
1343 * Generate error strings for PCAP_ERROR_ and PCAP_WARNING_ values.
1346 pcap_statustostr(int errnum)
1348 static char ebuf[15+10+1];
1353 return("Generic warning");
1355 case PCAP_WARNING_TSTAMP_TYPE_NOTSUP:
1356 return ("That type of time stamp is not supported by that device");
1358 case PCAP_WARNING_PROMISC_NOTSUP:
1359 return ("That device doesn't support promiscuous mode");
1362 return("Generic error");
1364 case PCAP_ERROR_BREAK:
1365 return("Loop terminated by pcap_breakloop");
1367 case PCAP_ERROR_NOT_ACTIVATED:
1368 return("The pcap_t has not been activated");
1370 case PCAP_ERROR_ACTIVATED:
1371 return ("The setting can't be changed after the pcap_t is activated");
1373 case PCAP_ERROR_NO_SUCH_DEVICE:
1374 return ("No such device exists");
1376 case PCAP_ERROR_RFMON_NOTSUP:
1377 return ("That device doesn't support monitor mode");
1379 case PCAP_ERROR_NOT_RFMON:
1380 return ("That operation is supported only in monitor mode");
1382 case PCAP_ERROR_PERM_DENIED:
1383 return ("You don't have permission to capture on that device");
1385 case PCAP_ERROR_IFACE_NOT_UP:
1386 return ("That device is not up");
1388 case PCAP_ERROR_CANTSET_TSTAMP_TYPE:
1389 return ("That device doesn't support setting the time stamp type");
1391 case PCAP_ERROR_PROMISC_PERM_DENIED:
1392 return ("You don't have permission to capture in promiscuous mode on that device");
1394 (void)snprintf(ebuf, sizeof ebuf, "Unknown error: %d", errnum);
1399 * Not all systems have strerror().
1402 pcap_strerror(int errnum)
1404 #ifdef HAVE_STRERROR
1405 return (strerror(errnum));
1407 extern int sys_nerr;
1408 extern const char *const sys_errlist[];
1409 static char ebuf[15+10+1];
1411 if ((unsigned int)errnum < sys_nerr)
1412 return ((char *)sys_errlist[errnum]);
1413 (void)snprintf(ebuf, sizeof ebuf, "Unknown error: %d", errnum);
1419 pcap_setfilter(pcap_t *p, struct bpf_program *fp)
1421 return (p->setfilter_op(p, fp));
1425 * Set direction flag, which controls whether we accept only incoming
1426 * packets, only outgoing packets, or both.
1427 * Note that, depending on the platform, some or all direction arguments
1428 * might not be supported.
1431 pcap_setdirection(pcap_t *p, pcap_direction_t d)
1433 if (p->setdirection_op == NULL) {
1434 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
1435 "Setting direction is not implemented on this platform");
1438 return (p->setdirection_op(p, d));
1442 pcap_stats(pcap_t *p, struct pcap_stat *ps)
1444 return (p->stats_op(p, ps));
1448 pcap_stats_dead(pcap_t *p, struct pcap_stat *ps _U_)
1450 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
1451 "Statistics aren't available from a pcap_open_dead pcap_t");
1457 pcap_setbuff(pcap_t *p, int dim)
1459 return (p->setbuff_op(p, dim));
1463 pcap_setbuff_dead(pcap_t *p, int dim)
1465 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
1466 "The kernel buffer size cannot be set on a pcap_open_dead pcap_t");
1471 pcap_setmode(pcap_t *p, int mode)
1473 return (p->setmode_op(p, mode));
1477 pcap_setmode_dead(pcap_t *p, int mode)
1479 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
1480 "impossible to set mode on a pcap_open_dead pcap_t");
1485 pcap_setmintocopy(pcap_t *p, int size)
1487 return (p->setmintocopy_op(p, size));
1491 pcap_setmintocopy_dead(pcap_t *p, int size)
1493 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
1494 "The mintocopy parameter cannot be set on a pcap_open_dead pcap_t");
1500 * On some platforms, we need to clean up promiscuous or monitor mode
1501 * when we close a device - and we want that to happen even if the
1502 * application just exits without explicitl closing devices.
1503 * On those platforms, we need to register a "close all the pcaps"
1504 * routine to be called when we exit, and need to maintain a list of
1505 * pcaps that need to be closed to clean up modes.
1507 * XXX - not thread-safe.
1511 * List of pcaps on which we've done something that needs to be
1513 * If there are any such pcaps, we arrange to call "pcap_close_all()"
1514 * when we exit, and have it close all of them.
1516 static struct pcap *pcaps_to_close;
1519 * TRUE if we've already called "atexit()" to cause "pcap_close_all()" to
1520 * be called on exit.
1522 static int did_atexit;
1525 pcap_close_all(void)
1527 struct pcap *handle;
1529 while ((handle = pcaps_to_close) != NULL)
1534 pcap_do_addexit(pcap_t *p)
1537 * If we haven't already done so, arrange to have
1538 * "pcap_close_all()" called when we exit.
1541 if (atexit(pcap_close_all) == -1) {
1543 * "atexit()" failed; let our caller know.
1545 strncpy(p->errbuf, "atexit failed",
1555 pcap_add_to_pcaps_to_close(pcap_t *p)
1557 p->md.next = pcaps_to_close;
1562 pcap_remove_from_pcaps_to_close(pcap_t *p)
1564 pcap_t *pc, *prevpc;
1566 for (pc = pcaps_to_close, prevpc = NULL; pc != NULL;
1567 prevpc = pc, pc = pc->md.next) {
1570 * Found it. Remove it from the list.
1572 if (prevpc == NULL) {
1574 * It was at the head of the list.
1576 pcaps_to_close = pc->md.next;
1579 * It was in the middle of the list.
1581 prevpc->md.next = pc->md.next;
1589 pcap_cleanup_live_common(pcap_t *p)
1591 if (p->buffer != NULL) {
1595 if (p->dlt_list != NULL) {
1600 if (p->tstamp_type_list != NULL) {
1601 free(p->tstamp_type_list);
1602 p->tstamp_type_list = NULL;
1603 p->tstamp_type_count = 0;
1605 pcap_freecode(&p->fcode);
1606 #if !defined(WIN32) && !defined(MSDOS)
1611 p->selectable_fd = -1;
1617 pcap_cleanup_dead(pcap_t *p _U_)
1619 /* Nothing to do. */
1623 pcap_open_dead(int linktype, int snaplen)
1627 p = malloc(sizeof(*p));
1630 memset (p, 0, sizeof(*p));
1631 p->snapshot = snaplen;
1632 p->linktype = linktype;
1633 p->stats_op = pcap_stats_dead;
1635 p->setbuff_op = pcap_setbuff_dead;
1636 p->setmode_op = pcap_setmode_dead;
1637 p->setmintocopy_op = pcap_setmintocopy_dead;
1639 p->cleanup_op = pcap_cleanup_dead;
1645 * API compatible with WinPcap's "send a packet" routine - returns -1
1646 * on error, 0 otherwise.
1648 * XXX - what if we get a short write?
1651 pcap_sendpacket(pcap_t *p, const u_char *buf, int size)
1653 if (p->inject_op(p, buf, size) == -1)
1659 * API compatible with OpenBSD's "send a packet" routine - returns -1 on
1660 * error, number of bytes written otherwise.
1663 pcap_inject(pcap_t *p, const void *buf, size_t size)
1665 return (p->inject_op(p, buf, size));
1669 pcap_close(pcap_t *p)
1671 if (p->opt.source != NULL)
1672 free(p->opt.source);
1678 * Given a BPF program, a pcap_pkthdr structure for a packet, and the raw
1679 * data for the packet, check whether the packet passes the filter.
1680 * Returns the return value of the filter program, which will be zero if
1681 * the packet doesn't pass and non-zero if the packet does pass.
1684 pcap_offline_filter(const struct bpf_program *fp, const struct pcap_pkthdr *h,
1687 const struct bpf_insn *fcode = fp->bf_insns;
1690 return (bpf_filter(fcode, pkt, h->len, h->caplen));
1696 * We make the version string static, and return a pointer to it, rather
1697 * than exporting the version string directly. On at least some UNIXes,
1698 * if you import data from a shared library into an program, the data is
1699 * bound into the program binary, so if the string in the version of the
1700 * library with which the program was linked isn't the same as the
1701 * string in the version of the library with which the program is being
1702 * run, various undesirable things may happen (warnings, the string
1703 * being the one from the version of the library with which the program
1704 * was linked, or even weirder things, such as the string being the one
1705 * from the library but being truncated).
1707 #ifdef HAVE_VERSION_H
1708 #include "version.h"
1710 static const char pcap_version_string[] = "libpcap version 1.x.y";
1715 * XXX - it'd be nice if we could somehow generate the WinPcap and libpcap
1716 * version numbers when building WinPcap. (It'd be nice to do so for
1717 * the packet.dll version number as well.)
1719 static const char wpcap_version_string[] = "4.0";
1720 static const char pcap_version_string_fmt[] =
1721 "WinPcap version %s, based on %s";
1722 static const char pcap_version_string_packet_dll_fmt[] =
1723 "WinPcap version %s (packet.dll version %s), based on %s";
1724 static char *full_pcap_version_string;
1727 pcap_lib_version(void)
1729 char *packet_version_string;
1730 size_t full_pcap_version_string_len;
1732 if (full_pcap_version_string == NULL) {
1734 * Generate the version string.
1736 packet_version_string = PacketGetVersion();
1737 if (strcmp(wpcap_version_string, packet_version_string) == 0) {
1739 * WinPcap version string and packet.dll version
1740 * string are the same; just report the WinPcap
1743 full_pcap_version_string_len =
1744 (sizeof pcap_version_string_fmt - 4) +
1745 strlen(wpcap_version_string) +
1746 strlen(pcap_version_string);
1747 full_pcap_version_string =
1748 malloc(full_pcap_version_string_len);
1749 sprintf(full_pcap_version_string,
1750 pcap_version_string_fmt, wpcap_version_string,
1751 pcap_version_string);
1754 * WinPcap version string and packet.dll version
1755 * string are different; that shouldn't be the
1756 * case (the two libraries should come from the
1757 * same version of WinPcap), so we report both
1760 full_pcap_version_string_len =
1761 (sizeof pcap_version_string_packet_dll_fmt - 6) +
1762 strlen(wpcap_version_string) +
1763 strlen(packet_version_string) +
1764 strlen(pcap_version_string);
1765 full_pcap_version_string = malloc(full_pcap_version_string_len);
1767 sprintf(full_pcap_version_string,
1768 pcap_version_string_packet_dll_fmt,
1769 wpcap_version_string, packet_version_string,
1770 pcap_version_string);
1773 return (full_pcap_version_string);
1776 #elif defined(MSDOS)
1778 static char *full_pcap_version_string;
1781 pcap_lib_version (void)
1783 char *packet_version_string;
1784 size_t full_pcap_version_string_len;
1785 static char dospfx[] = "DOS-";
1787 if (full_pcap_version_string == NULL) {
1789 * Generate the version string.
1791 full_pcap_version_string_len =
1792 sizeof dospfx + strlen(pcap_version_string);
1793 full_pcap_version_string =
1794 malloc(full_pcap_version_string_len);
1795 strcpy(full_pcap_version_string, dospfx);
1796 strcat(full_pcap_version_string, pcap_version_string);
1798 return (full_pcap_version_string);
1804 pcap_lib_version(void)
1806 return (pcap_version_string);