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"
109 #ifdef PCAP_SUPPORT_NETMAP
110 pcap_t* pcap_netmap_create(const char *device, char *ebuf, int *is_ours);
114 pcap_not_initialized(pcap_t *pcap)
116 /* this means 'not initialized' */
117 return (PCAP_ERROR_NOT_ACTIVATED);
121 * Returns 1 if rfmon mode can be set on the pcap_t, 0 if it can't,
122 * a PCAP_ERROR value on an error.
125 pcap_can_set_rfmon(pcap_t *p)
127 return (p->can_set_rfmon_op(p));
131 * For systems where rfmon mode is never supported.
134 pcap_cant_set_rfmon(pcap_t *p _U_)
140 * Sets *tstamp_typesp to point to an array 1 or more supported time stamp
141 * types; the return value is the number of supported time stamp types.
142 * The list should be freed by a call to pcap_free_tstamp_types() when
143 * you're done with it.
145 * A return value of 0 means "you don't get a choice of time stamp type",
146 * in which case *tstamp_typesp is set to null.
148 * PCAP_ERROR is returned on error.
151 pcap_list_tstamp_types(pcap_t *p, int **tstamp_typesp)
153 if (p->tstamp_type_count == 0) {
155 * We don't support multiple time stamp types.
157 *tstamp_typesp = NULL;
159 *tstamp_typesp = (int*)calloc(sizeof(**tstamp_typesp),
160 p->tstamp_type_count);
161 if (*tstamp_typesp == NULL) {
162 (void)snprintf(p->errbuf, sizeof(p->errbuf),
163 "malloc: %s", pcap_strerror(errno));
166 (void)memcpy(*tstamp_typesp, p->tstamp_type_list,
167 sizeof(**tstamp_typesp) * p->tstamp_type_count);
169 return (p->tstamp_type_count);
173 * In Windows, you might have a library built with one version of the
174 * C runtime library and an application built with another version of
175 * the C runtime library, which means that the library might use one
176 * version of malloc() and free() and the application might use another
177 * version of malloc() and free(). If so, that means something
178 * allocated by the library cannot be freed by the application, so we
179 * need to have a pcap_free_tstamp_types() routine to free up the list
180 * allocated by pcap_list_tstamp_types(), even though it's just a wrapper
184 pcap_free_tstamp_types(int *tstamp_type_list)
186 free(tstamp_type_list);
190 * Default one-shot callback; overridden for capture types where the
191 * packet data cannot be guaranteed to be available after the callback
192 * returns, so that a copy must be made.
195 pcap_oneshot(u_char *user, const struct pcap_pkthdr *h, const u_char *pkt)
197 struct oneshot_userdata *sp = (struct oneshot_userdata *)user;
204 pcap_next(pcap_t *p, struct pcap_pkthdr *h)
206 struct oneshot_userdata s;
212 if (pcap_dispatch(p, 1, p->oneshot_callback, (u_char *)&s) <= 0)
218 pcap_next_ex(pcap_t *p, struct pcap_pkthdr **pkt_header,
219 const u_char **pkt_data)
221 struct oneshot_userdata s;
223 s.hdr = &p->pcap_header;
227 /* Saves a pointer to the packet headers */
228 *pkt_header= &p->pcap_header;
230 if (p->sf.rfile != NULL) {
233 /* We are on an offline capture */
234 status = pcap_offline_read(p, 1, p->oneshot_callback,
238 * Return codes for pcap_offline_read() are:
242 * The first one ('0') conflicts with the return code of
243 * 0 from pcap_read() meaning "no packets arrived before
244 * the timeout expired", so we map it to -2 so you can
245 * distinguish between an EOF from a savefile and a
246 * "no packets arrived before the timeout expired, try
247 * again" from a live capture.
256 * Return codes for pcap_read() are:
259 * - -2: loop was broken out of with pcap_breakloop()
261 * The first one ('0') conflicts with the return code of 0 from
262 * pcap_offline_read() meaning "end of file".
264 return (p->read_op(p, 1, p->oneshot_callback, (u_char *)&s));
267 #if defined(DAG_ONLY)
269 pcap_findalldevs(pcap_if_t **alldevsp, char *errbuf)
271 return (dag_findalldevs(alldevsp, errbuf));
275 pcap_create(const char *source, char *errbuf)
277 return (dag_create(source, errbuf));
279 #elif defined(SEPTEL_ONLY)
281 pcap_findalldevs(pcap_if_t **alldevsp, char *errbuf)
283 return (septel_findalldevs(alldevsp, errbuf));
287 pcap_create(const char *source, char *errbuf)
289 return (septel_create(source, errbuf));
291 #elif defined(SNF_ONLY)
293 pcap_findalldevs(pcap_if_t **alldevsp, char *errbuf)
295 return (snf_findalldevs(alldevsp, errbuf));
299 pcap_create(const char *source, char *errbuf)
301 return (snf_create(source, errbuf));
303 #else /* regular pcap */
304 struct capture_source_type {
305 int (*findalldevs_op)(pcap_if_t **, char *);
306 pcap_t *(*create_op)(const char *, char *, int *);
307 } capture_source_types[] = {
308 #ifdef PCAP_SUPPORT_NETMAP
309 { NULL, pcap_netmap_create },
312 { dag_findalldevs, dag_create },
314 #ifdef HAVE_SEPTEL_API
315 { septel_findalldevs, septel_create },
318 { snf_findalldevs, snf_create },
320 #ifdef PCAP_SUPPORT_BT
321 { bt_findalldevs, bt_create },
323 #if PCAP_SUPPORT_CANUSB
324 { canusb_findalldevs, canusb_create },
326 #ifdef PCAP_SUPPORT_CAN
327 { can_findalldevs, can_create },
329 #ifdef PCAP_SUPPORT_USB
330 { usb_findalldevs, usb_create },
332 #ifdef PCAP_SUPPORT_NETFILTER
333 { netfilter_findalldevs, netfilter_create },
339 * Get a list of all capture sources that are up and that we can open.
340 * Returns -1 on error, 0 otherwise.
341 * The list, as returned through "alldevsp", may be null if no interfaces
342 * were up and could be opened.
345 pcap_findalldevs(pcap_if_t **alldevsp, char *errbuf)
350 * Get the list of regular interfaces first.
352 if (pcap_findalldevs_interfaces(alldevsp, errbuf) == -1)
353 return (-1); /* failure */
356 * Add any interfaces that need a platform-specific mechanism
359 if (pcap_platform_finddevs(alldevsp, errbuf) == -1) {
361 * We had an error; free the list we've been
364 if (*alldevsp != NULL) {
365 pcap_freealldevs(*alldevsp);
372 * Ask each of the non-local-network-interface capture
373 * source types what interfaces they have.
375 for (i = 0; capture_source_types[i].findalldevs_op != NULL; i++) {
376 if (capture_source_types[i].findalldevs_op(alldevsp, errbuf) == -1) {
378 * We had an error; free the list we've been
381 if (*alldevsp != NULL) {
382 pcap_freealldevs(*alldevsp);
392 pcap_create(const char *source, char *errbuf)
399 * A null source name is equivalent to the "any" device -
400 * which might not be supported on this platform, but
401 * this means that you'll get a "not supported" error
402 * rather than, say, a crash when we try to dereference
409 * Try each of the non-local-network-interface capture
410 * source types until we find one that works for this
411 * device or run out of types.
413 for (i = 0; capture_source_types[i].create_op != NULL; i++) {
415 p = capture_source_types[i].create_op(source, errbuf, &is_theirs);
418 * The device name refers to a device of the
419 * type in question; either it succeeded,
420 * in which case p refers to a pcap_t to
421 * later activate for the device, or it
422 * failed, in which case p is null and we
423 * should return that to report the failure
431 * OK, try it as a regular network interface.
433 return (pcap_create_interface(source, errbuf));
438 initialize_ops(pcap_t *p)
441 * Set operation pointers for operations that only work on
442 * an activated pcap_t to point to a routine that returns
443 * a "this isn't activated" error.
445 p->read_op = (read_op_t)pcap_not_initialized;
446 p->inject_op = (inject_op_t)pcap_not_initialized;
447 p->setfilter_op = (setfilter_op_t)pcap_not_initialized;
448 p->setdirection_op = (setdirection_op_t)pcap_not_initialized;
449 p->set_datalink_op = (set_datalink_op_t)pcap_not_initialized;
450 p->getnonblock_op = (getnonblock_op_t)pcap_not_initialized;
451 p->setnonblock_op = (setnonblock_op_t)pcap_not_initialized;
452 p->stats_op = (stats_op_t)pcap_not_initialized;
454 p->setbuff_op = (setbuff_op_t)pcap_not_initialized;
455 p->setmode_op = (setmode_op_t)pcap_not_initialized;
456 p->setmintocopy_op = (setmintocopy_op_t)pcap_not_initialized;
460 * Default cleanup operation - implementations can override
461 * this, but should call pcap_cleanup_live_common() after
462 * doing their own additional cleanup.
464 p->cleanup_op = pcap_cleanup_live_common;
467 * In most cases, the standard one-short callback can
468 * be used for pcap_next()/pcap_next_ex().
470 p->oneshot_callback = pcap_oneshot;
474 pcap_create_common(const char *source, char *ebuf)
478 p = malloc(sizeof(*p));
480 snprintf(ebuf, PCAP_ERRBUF_SIZE, "malloc: %s",
481 pcap_strerror(errno));
484 memset(p, 0, sizeof(*p));
486 p->fd = -1; /* not opened yet */
487 p->selectable_fd = -1;
491 p->opt.source = strdup(source);
492 if (p->opt.source == NULL) {
493 snprintf(ebuf, PCAP_ERRBUF_SIZE, "malloc: %s",
494 pcap_strerror(errno));
500 * Default to "can't set rfmon mode"; if it's supported by
501 * a platform, the create routine that called us can set
502 * the op to its routine to check whether a particular
503 * device supports it.
505 p->can_set_rfmon_op = pcap_cant_set_rfmon;
509 /* put in some defaults*/
510 pcap_set_timeout(p, 0);
511 pcap_set_snaplen(p, 65535); /* max packet size */
513 p->opt.buffer_size = 0;
514 p->opt.tstamp_type = -1; /* default to not setting time stamp type */
519 pcap_check_activated(pcap_t *p)
522 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "can't perform "
523 " operation on activated capture");
530 pcap_set_snaplen(pcap_t *p, int snaplen)
532 if (pcap_check_activated(p))
533 return (PCAP_ERROR_ACTIVATED);
534 p->snapshot = snaplen;
539 pcap_set_promisc(pcap_t *p, int promisc)
541 if (pcap_check_activated(p))
542 return (PCAP_ERROR_ACTIVATED);
543 p->opt.promisc = promisc;
548 pcap_set_rfmon(pcap_t *p, int rfmon)
550 if (pcap_check_activated(p))
551 return (PCAP_ERROR_ACTIVATED);
552 p->opt.rfmon = rfmon;
557 pcap_set_timeout(pcap_t *p, int timeout_ms)
559 if (pcap_check_activated(p))
560 return (PCAP_ERROR_ACTIVATED);
561 p->md.timeout = timeout_ms;
566 pcap_set_tstamp_type(pcap_t *p, int tstamp_type)
570 if (pcap_check_activated(p))
571 return (PCAP_ERROR_ACTIVATED);
574 * If p->tstamp_type_count is 0, we don't support setting
575 * the time stamp type at all.
577 if (p->tstamp_type_count == 0)
578 return (PCAP_ERROR_CANTSET_TSTAMP_TYPE);
581 * Check whether we claim to support this type of time stamp.
583 for (i = 0; i < p->tstamp_type_count; i++) {
584 if (p->tstamp_type_list[i] == tstamp_type) {
588 p->opt.tstamp_type = tstamp_type;
594 * No. We support setting the time stamp type, but not to this
597 return (PCAP_WARNING_TSTAMP_TYPE_NOTSUP);
601 pcap_set_buffer_size(pcap_t *p, int buffer_size)
603 if (pcap_check_activated(p))
604 return (PCAP_ERROR_ACTIVATED);
605 p->opt.buffer_size = buffer_size;
610 pcap_activate(pcap_t *p)
615 * Catch attempts to re-activate an already-activated
616 * pcap_t; this should, for example, catch code that
617 * calls pcap_open_live() followed by pcap_activate(),
618 * as some code that showed up in a Stack Exchange
621 if (pcap_check_activated(p))
622 return (PCAP_ERROR_ACTIVATED);
623 status = p->activate_op(p);
627 if (p->errbuf[0] == '\0') {
629 * No error message supplied by the activate routine;
630 * for the benefit of programs that don't specially
631 * handle errors other than PCAP_ERROR, return the
632 * error message corresponding to the status.
634 snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "%s",
635 pcap_statustostr(status));
639 * Undo any operation pointer setting, etc. done by
640 * the activate operation.
648 pcap_open_live(const char *source, int snaplen, int promisc, int to_ms, char *errbuf)
653 p = pcap_create(source, errbuf);
656 status = pcap_set_snaplen(p, snaplen);
659 status = pcap_set_promisc(p, promisc);
662 status = pcap_set_timeout(p, to_ms);
666 * Mark this as opened with pcap_open_live(), so that, for
667 * example, we show the full list of DLT_ values, rather
668 * than just the ones that are compatible with capturing
669 * when not in monitor mode. That allows existing applications
670 * to work the way they used to work, but allows new applications
671 * that know about the new open API to, for example, find out the
672 * DLT_ values that they can select without changing whether
673 * the adapter is in monitor mode or not.
676 status = pcap_activate(p);
681 if (status == PCAP_ERROR)
682 snprintf(errbuf, PCAP_ERRBUF_SIZE, "%s: %s", source,
684 else if (status == PCAP_ERROR_NO_SUCH_DEVICE ||
685 status == PCAP_ERROR_PERM_DENIED ||
686 status == PCAP_ERROR_PROMISC_PERM_DENIED)
687 snprintf(errbuf, PCAP_ERRBUF_SIZE, "%s: %s (%s)", source,
688 pcap_statustostr(status), p->errbuf);
690 snprintf(errbuf, PCAP_ERRBUF_SIZE, "%s: %s", source,
691 pcap_statustostr(status));
697 pcap_dispatch(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
699 return (p->read_op(p, cnt, callback, user));
703 * XXX - is this necessary?
706 pcap_read(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
709 return (p->read_op(p, cnt, callback, user));
713 pcap_loop(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
718 if (p->sf.rfile != NULL) {
720 * 0 means EOF, so don't loop if we get 0.
722 n = pcap_offline_read(p, cnt, callback, user);
725 * XXX keep reading until we get something
726 * (or an error occurs)
729 n = p->read_op(p, cnt, callback, user);
743 * Force the loop in "pcap_read()" or "pcap_read_offline()" to terminate.
746 pcap_breakloop(pcap_t *p)
752 pcap_datalink(pcap_t *p)
754 return (p->linktype);
758 pcap_datalink_ext(pcap_t *p)
760 return (p->linktype_ext);
764 pcap_list_datalinks(pcap_t *p, int **dlt_buffer)
766 if (p->dlt_count == 0) {
768 * We couldn't fetch the list of DLTs, which means
769 * this platform doesn't support changing the
770 * DLT for an interface. Return a list of DLTs
771 * containing only the DLT this device supports.
773 *dlt_buffer = (int*)malloc(sizeof(**dlt_buffer));
774 if (*dlt_buffer == NULL) {
775 (void)snprintf(p->errbuf, sizeof(p->errbuf),
776 "malloc: %s", pcap_strerror(errno));
779 **dlt_buffer = p->linktype;
782 *dlt_buffer = (int*)calloc(sizeof(**dlt_buffer), p->dlt_count);
783 if (*dlt_buffer == NULL) {
784 (void)snprintf(p->errbuf, sizeof(p->errbuf),
785 "malloc: %s", pcap_strerror(errno));
788 (void)memcpy(*dlt_buffer, p->dlt_list,
789 sizeof(**dlt_buffer) * p->dlt_count);
790 return (p->dlt_count);
795 * In Windows, you might have a library built with one version of the
796 * C runtime library and an application built with another version of
797 * the C runtime library, which means that the library might use one
798 * version of malloc() and free() and the application might use another
799 * version of malloc() and free(). If so, that means something
800 * allocated by the library cannot be freed by the application, so we
801 * need to have a pcap_free_datalinks() routine to free up the list
802 * allocated by pcap_list_datalinks(), even though it's just a wrapper
806 pcap_free_datalinks(int *dlt_list)
812 pcap_set_datalink(pcap_t *p, int dlt)
815 const char *dlt_name;
817 if (p->dlt_count == 0 || p->set_datalink_op == NULL) {
819 * We couldn't fetch the list of DLTs, or we don't
820 * have a "set datalink" operation, which means
821 * this platform doesn't support changing the
822 * DLT for an interface. Check whether the new
823 * DLT is the one this interface supports.
825 if (p->linktype != dlt)
829 * It is, so there's nothing we need to do here.
833 for (i = 0; i < p->dlt_count; i++)
834 if (p->dlt_list[i] == dlt)
836 if (i >= p->dlt_count)
838 if (p->dlt_count == 2 && p->dlt_list[0] == DLT_EN10MB &&
841 * This is presumably an Ethernet device, as the first
842 * link-layer type it offers is DLT_EN10MB, and the only
843 * other type it offers is DLT_DOCSIS. That means that
844 * we can't tell the driver to supply DOCSIS link-layer
845 * headers - we're just pretending that's what we're
846 * getting, as, presumably, we're capturing on a dedicated
847 * link to a Cisco Cable Modem Termination System, and
848 * it's putting raw DOCSIS frames on the wire inside low-level
854 if (p->set_datalink_op(p, dlt) == -1)
860 dlt_name = pcap_datalink_val_to_name(dlt);
861 if (dlt_name != NULL) {
862 (void) snprintf(p->errbuf, sizeof(p->errbuf),
863 "%s is not one of the DLTs supported by this device",
866 (void) snprintf(p->errbuf, sizeof(p->errbuf),
867 "DLT %d is not one of the DLTs supported by this device",
874 * This array is designed for mapping upper and lower case letter
875 * together for a case independent comparison. The mappings are
876 * based upon ascii character sequences.
878 static const u_char charmap[] = {
879 (u_char)'\000', (u_char)'\001', (u_char)'\002', (u_char)'\003',
880 (u_char)'\004', (u_char)'\005', (u_char)'\006', (u_char)'\007',
881 (u_char)'\010', (u_char)'\011', (u_char)'\012', (u_char)'\013',
882 (u_char)'\014', (u_char)'\015', (u_char)'\016', (u_char)'\017',
883 (u_char)'\020', (u_char)'\021', (u_char)'\022', (u_char)'\023',
884 (u_char)'\024', (u_char)'\025', (u_char)'\026', (u_char)'\027',
885 (u_char)'\030', (u_char)'\031', (u_char)'\032', (u_char)'\033',
886 (u_char)'\034', (u_char)'\035', (u_char)'\036', (u_char)'\037',
887 (u_char)'\040', (u_char)'\041', (u_char)'\042', (u_char)'\043',
888 (u_char)'\044', (u_char)'\045', (u_char)'\046', (u_char)'\047',
889 (u_char)'\050', (u_char)'\051', (u_char)'\052', (u_char)'\053',
890 (u_char)'\054', (u_char)'\055', (u_char)'\056', (u_char)'\057',
891 (u_char)'\060', (u_char)'\061', (u_char)'\062', (u_char)'\063',
892 (u_char)'\064', (u_char)'\065', (u_char)'\066', (u_char)'\067',
893 (u_char)'\070', (u_char)'\071', (u_char)'\072', (u_char)'\073',
894 (u_char)'\074', (u_char)'\075', (u_char)'\076', (u_char)'\077',
895 (u_char)'\100', (u_char)'\141', (u_char)'\142', (u_char)'\143',
896 (u_char)'\144', (u_char)'\145', (u_char)'\146', (u_char)'\147',
897 (u_char)'\150', (u_char)'\151', (u_char)'\152', (u_char)'\153',
898 (u_char)'\154', (u_char)'\155', (u_char)'\156', (u_char)'\157',
899 (u_char)'\160', (u_char)'\161', (u_char)'\162', (u_char)'\163',
900 (u_char)'\164', (u_char)'\165', (u_char)'\166', (u_char)'\167',
901 (u_char)'\170', (u_char)'\171', (u_char)'\172', (u_char)'\133',
902 (u_char)'\134', (u_char)'\135', (u_char)'\136', (u_char)'\137',
903 (u_char)'\140', (u_char)'\141', (u_char)'\142', (u_char)'\143',
904 (u_char)'\144', (u_char)'\145', (u_char)'\146', (u_char)'\147',
905 (u_char)'\150', (u_char)'\151', (u_char)'\152', (u_char)'\153',
906 (u_char)'\154', (u_char)'\155', (u_char)'\156', (u_char)'\157',
907 (u_char)'\160', (u_char)'\161', (u_char)'\162', (u_char)'\163',
908 (u_char)'\164', (u_char)'\165', (u_char)'\166', (u_char)'\167',
909 (u_char)'\170', (u_char)'\171', (u_char)'\172', (u_char)'\173',
910 (u_char)'\174', (u_char)'\175', (u_char)'\176', (u_char)'\177',
911 (u_char)'\200', (u_char)'\201', (u_char)'\202', (u_char)'\203',
912 (u_char)'\204', (u_char)'\205', (u_char)'\206', (u_char)'\207',
913 (u_char)'\210', (u_char)'\211', (u_char)'\212', (u_char)'\213',
914 (u_char)'\214', (u_char)'\215', (u_char)'\216', (u_char)'\217',
915 (u_char)'\220', (u_char)'\221', (u_char)'\222', (u_char)'\223',
916 (u_char)'\224', (u_char)'\225', (u_char)'\226', (u_char)'\227',
917 (u_char)'\230', (u_char)'\231', (u_char)'\232', (u_char)'\233',
918 (u_char)'\234', (u_char)'\235', (u_char)'\236', (u_char)'\237',
919 (u_char)'\240', (u_char)'\241', (u_char)'\242', (u_char)'\243',
920 (u_char)'\244', (u_char)'\245', (u_char)'\246', (u_char)'\247',
921 (u_char)'\250', (u_char)'\251', (u_char)'\252', (u_char)'\253',
922 (u_char)'\254', (u_char)'\255', (u_char)'\256', (u_char)'\257',
923 (u_char)'\260', (u_char)'\261', (u_char)'\262', (u_char)'\263',
924 (u_char)'\264', (u_char)'\265', (u_char)'\266', (u_char)'\267',
925 (u_char)'\270', (u_char)'\271', (u_char)'\272', (u_char)'\273',
926 (u_char)'\274', (u_char)'\275', (u_char)'\276', (u_char)'\277',
927 (u_char)'\300', (u_char)'\341', (u_char)'\342', (u_char)'\343',
928 (u_char)'\344', (u_char)'\345', (u_char)'\346', (u_char)'\347',
929 (u_char)'\350', (u_char)'\351', (u_char)'\352', (u_char)'\353',
930 (u_char)'\354', (u_char)'\355', (u_char)'\356', (u_char)'\357',
931 (u_char)'\360', (u_char)'\361', (u_char)'\362', (u_char)'\363',
932 (u_char)'\364', (u_char)'\365', (u_char)'\366', (u_char)'\367',
933 (u_char)'\370', (u_char)'\371', (u_char)'\372', (u_char)'\333',
934 (u_char)'\334', (u_char)'\335', (u_char)'\336', (u_char)'\337',
935 (u_char)'\340', (u_char)'\341', (u_char)'\342', (u_char)'\343',
936 (u_char)'\344', (u_char)'\345', (u_char)'\346', (u_char)'\347',
937 (u_char)'\350', (u_char)'\351', (u_char)'\352', (u_char)'\353',
938 (u_char)'\354', (u_char)'\355', (u_char)'\356', (u_char)'\357',
939 (u_char)'\360', (u_char)'\361', (u_char)'\362', (u_char)'\363',
940 (u_char)'\364', (u_char)'\365', (u_char)'\366', (u_char)'\367',
941 (u_char)'\370', (u_char)'\371', (u_char)'\372', (u_char)'\373',
942 (u_char)'\374', (u_char)'\375', (u_char)'\376', (u_char)'\377',
946 pcap_strcasecmp(const char *s1, const char *s2)
948 register const u_char *cm = charmap,
949 *us1 = (const u_char *)s1,
950 *us2 = (const u_char *)s2;
952 while (cm[*us1] == cm[*us2++])
955 return (cm[*us1] - cm[*--us2]);
960 const char *description;
964 #define DLT_CHOICE(code, description) { #code, description, code }
965 #define DLT_CHOICE_SENTINEL { NULL, NULL, 0 }
967 static struct dlt_choice dlt_choices[] = {
968 DLT_CHOICE(DLT_NULL, "BSD loopback"),
969 DLT_CHOICE(DLT_EN10MB, "Ethernet"),
970 DLT_CHOICE(DLT_IEEE802, "Token ring"),
971 DLT_CHOICE(DLT_ARCNET, "BSD ARCNET"),
972 DLT_CHOICE(DLT_SLIP, "SLIP"),
973 DLT_CHOICE(DLT_PPP, "PPP"),
974 DLT_CHOICE(DLT_FDDI, "FDDI"),
975 DLT_CHOICE(DLT_ATM_RFC1483, "RFC 1483 LLC-encapsulated ATM"),
976 DLT_CHOICE(DLT_RAW, "Raw IP"),
977 DLT_CHOICE(DLT_SLIP_BSDOS, "BSD/OS SLIP"),
978 DLT_CHOICE(DLT_PPP_BSDOS, "BSD/OS PPP"),
979 DLT_CHOICE(DLT_ATM_CLIP, "Linux Classical IP-over-ATM"),
980 DLT_CHOICE(DLT_PPP_SERIAL, "PPP over serial"),
981 DLT_CHOICE(DLT_PPP_ETHER, "PPPoE"),
982 DLT_CHOICE(DLT_SYMANTEC_FIREWALL, "Symantec Firewall"),
983 DLT_CHOICE(DLT_C_HDLC, "Cisco HDLC"),
984 DLT_CHOICE(DLT_IEEE802_11, "802.11"),
985 DLT_CHOICE(DLT_FRELAY, "Frame Relay"),
986 DLT_CHOICE(DLT_LOOP, "OpenBSD loopback"),
987 DLT_CHOICE(DLT_ENC, "OpenBSD encapsulated IP"),
988 DLT_CHOICE(DLT_LINUX_SLL, "Linux cooked"),
989 DLT_CHOICE(DLT_LTALK, "Localtalk"),
990 DLT_CHOICE(DLT_PFLOG, "OpenBSD pflog file"),
991 DLT_CHOICE(DLT_PFSYNC, "Packet filter state syncing"),
992 DLT_CHOICE(DLT_PRISM_HEADER, "802.11 plus Prism header"),
993 DLT_CHOICE(DLT_IP_OVER_FC, "RFC 2625 IP-over-Fibre Channel"),
994 DLT_CHOICE(DLT_SUNATM, "Sun raw ATM"),
995 DLT_CHOICE(DLT_IEEE802_11_RADIO, "802.11 plus radiotap header"),
996 DLT_CHOICE(DLT_ARCNET_LINUX, "Linux ARCNET"),
997 DLT_CHOICE(DLT_JUNIPER_MLPPP, "Juniper Multi-Link PPP"),
998 DLT_CHOICE(DLT_JUNIPER_MLFR, "Juniper Multi-Link Frame Relay"),
999 DLT_CHOICE(DLT_JUNIPER_ES, "Juniper Encryption Services PIC"),
1000 DLT_CHOICE(DLT_JUNIPER_GGSN, "Juniper GGSN PIC"),
1001 DLT_CHOICE(DLT_JUNIPER_MFR, "Juniper FRF.16 Frame Relay"),
1002 DLT_CHOICE(DLT_JUNIPER_ATM2, "Juniper ATM2 PIC"),
1003 DLT_CHOICE(DLT_JUNIPER_SERVICES, "Juniper Advanced Services PIC"),
1004 DLT_CHOICE(DLT_JUNIPER_ATM1, "Juniper ATM1 PIC"),
1005 DLT_CHOICE(DLT_APPLE_IP_OVER_IEEE1394, "Apple IP-over-IEEE 1394"),
1006 DLT_CHOICE(DLT_MTP2_WITH_PHDR, "SS7 MTP2 with Pseudo-header"),
1007 DLT_CHOICE(DLT_MTP2, "SS7 MTP2"),
1008 DLT_CHOICE(DLT_MTP3, "SS7 MTP3"),
1009 DLT_CHOICE(DLT_SCCP, "SS7 SCCP"),
1010 DLT_CHOICE(DLT_DOCSIS, "DOCSIS"),
1011 DLT_CHOICE(DLT_LINUX_IRDA, "Linux IrDA"),
1012 DLT_CHOICE(DLT_IEEE802_11_RADIO_AVS, "802.11 plus AVS radio information header"),
1013 DLT_CHOICE(DLT_JUNIPER_MONITOR, "Juniper Passive Monitor PIC"),
1014 DLT_CHOICE(DLT_PPP_PPPD, "PPP for pppd, with direction flag"),
1015 DLT_CHOICE(DLT_JUNIPER_PPPOE, "Juniper PPPoE"),
1016 DLT_CHOICE(DLT_JUNIPER_PPPOE_ATM, "Juniper PPPoE/ATM"),
1017 DLT_CHOICE(DLT_GPRS_LLC, "GPRS LLC"),
1018 DLT_CHOICE(DLT_GPF_T, "GPF-T"),
1019 DLT_CHOICE(DLT_GPF_F, "GPF-F"),
1020 DLT_CHOICE(DLT_JUNIPER_PIC_PEER, "Juniper PIC Peer"),
1021 DLT_CHOICE(DLT_ERF_ETH, "Ethernet with Endace ERF header"),
1022 DLT_CHOICE(DLT_ERF_POS, "Packet-over-SONET with Endace ERF header"),
1023 DLT_CHOICE(DLT_LINUX_LAPD, "Linux vISDN LAPD"),
1024 DLT_CHOICE(DLT_JUNIPER_ETHER, "Juniper Ethernet"),
1025 DLT_CHOICE(DLT_JUNIPER_PPP, "Juniper PPP"),
1026 DLT_CHOICE(DLT_JUNIPER_FRELAY, "Juniper Frame Relay"),
1027 DLT_CHOICE(DLT_JUNIPER_CHDLC, "Juniper C-HDLC"),
1028 DLT_CHOICE(DLT_MFR, "FRF.16 Frame Relay"),
1029 DLT_CHOICE(DLT_JUNIPER_VP, "Juniper Voice PIC"),
1030 DLT_CHOICE(DLT_A429, "Arinc 429"),
1031 DLT_CHOICE(DLT_A653_ICM, "Arinc 653 Interpartition Communication"),
1032 DLT_CHOICE(DLT_USB, "USB"),
1033 DLT_CHOICE(DLT_BLUETOOTH_HCI_H4, "Bluetooth HCI UART transport layer"),
1034 DLT_CHOICE(DLT_IEEE802_16_MAC_CPS, "IEEE 802.16 MAC Common Part Sublayer"),
1035 DLT_CHOICE(DLT_USB_LINUX, "USB with Linux header"),
1036 DLT_CHOICE(DLT_CAN20B, "Controller Area Network (CAN) v. 2.0B"),
1037 DLT_CHOICE(DLT_IEEE802_15_4_LINUX, "IEEE 802.15.4 with Linux padding"),
1038 DLT_CHOICE(DLT_PPI, "Per-Packet Information"),
1039 DLT_CHOICE(DLT_IEEE802_16_MAC_CPS_RADIO, "IEEE 802.16 MAC Common Part Sublayer plus radiotap header"),
1040 DLT_CHOICE(DLT_JUNIPER_ISM, "Juniper Integrated Service Module"),
1041 DLT_CHOICE(DLT_IEEE802_15_4, "IEEE 802.15.4 with FCS"),
1042 DLT_CHOICE(DLT_SITA, "SITA pseudo-header"),
1043 DLT_CHOICE(DLT_ERF, "Endace ERF header"),
1044 DLT_CHOICE(DLT_RAIF1, "Ethernet with u10 Networks pseudo-header"),
1045 DLT_CHOICE(DLT_IPMB, "IPMB"),
1046 DLT_CHOICE(DLT_JUNIPER_ST, "Juniper Secure Tunnel"),
1047 DLT_CHOICE(DLT_BLUETOOTH_HCI_H4_WITH_PHDR, "Bluetooth HCI UART transport layer plus pseudo-header"),
1048 DLT_CHOICE(DLT_AX25_KISS, "AX.25 with KISS header"),
1049 DLT_CHOICE(DLT_IEEE802_15_4_NONASK_PHY, "IEEE 802.15.4 with non-ASK PHY data"),
1050 DLT_CHOICE(DLT_MPLS, "MPLS with label as link-layer header"),
1051 DLT_CHOICE(DLT_USB_LINUX_MMAPPED, "USB with padded Linux header"),
1052 DLT_CHOICE(DLT_DECT, "DECT"),
1053 DLT_CHOICE(DLT_AOS, "AOS Space Data Link protocol"),
1054 DLT_CHOICE(DLT_WIHART, "Wireless HART"),
1055 DLT_CHOICE(DLT_FC_2, "Fibre Channel FC-2"),
1056 DLT_CHOICE(DLT_FC_2_WITH_FRAME_DELIMS, "Fibre Channel FC-2 with frame delimiters"),
1057 DLT_CHOICE(DLT_IPNET, "Solaris ipnet"),
1058 DLT_CHOICE(DLT_CAN_SOCKETCAN, "CAN-bus with SocketCAN headers"),
1059 DLT_CHOICE(DLT_IPV4, "Raw IPv4"),
1060 DLT_CHOICE(DLT_IPV6, "Raw IPv6"),
1061 DLT_CHOICE(DLT_IEEE802_15_4_NOFCS, "IEEE 802.15.4 without FCS"),
1062 DLT_CHOICE(DLT_JUNIPER_VS, "Juniper Virtual Server"),
1063 DLT_CHOICE(DLT_JUNIPER_SRX_E2E, "Juniper SRX E2E"),
1064 DLT_CHOICE(DLT_JUNIPER_FIBRECHANNEL, "Juniper Fibre Channel"),
1065 DLT_CHOICE(DLT_DVB_CI, "DVB-CI"),
1066 DLT_CHOICE(DLT_JUNIPER_ATM_CEMIC, "Juniper ATM CEMIC"),
1067 DLT_CHOICE(DLT_NFLOG, "Linux netfilter log messages"),
1068 DLT_CHOICE(DLT_NETANALYZER, "Ethernet with Hilscher netANALYZER pseudo-header"),
1069 DLT_CHOICE(DLT_NETANALYZER_TRANSPARENT, "Ethernet with Hilscher netANALYZER pseudo-header and with preamble and SFD"),
1070 DLT_CHOICE(DLT_IPOIB, "RFC 4391 IP-over-Infiniband"),
1075 pcap_datalink_name_to_val(const char *name)
1079 for (i = 0; dlt_choices[i].name != NULL; i++) {
1080 if (pcap_strcasecmp(dlt_choices[i].name + sizeof("DLT_") - 1,
1082 return (dlt_choices[i].dlt);
1088 pcap_datalink_val_to_name(int dlt)
1092 for (i = 0; dlt_choices[i].name != NULL; i++) {
1093 if (dlt_choices[i].dlt == dlt)
1094 return (dlt_choices[i].name + sizeof("DLT_") - 1);
1100 pcap_datalink_val_to_description(int dlt)
1104 for (i = 0; dlt_choices[i].name != NULL; i++) {
1105 if (dlt_choices[i].dlt == dlt)
1106 return (dlt_choices[i].description);
1111 struct tstamp_type_choice {
1113 const char *description;
1117 static struct tstamp_type_choice tstamp_type_choices[] = {
1118 { "host", "Host", PCAP_TSTAMP_HOST },
1119 { "host_lowprec", "Host, low precision", PCAP_TSTAMP_HOST_LOWPREC },
1120 { "host_hiprec", "Host, high precision", PCAP_TSTAMP_HOST_HIPREC },
1121 { "adapter", "Adapter", PCAP_TSTAMP_ADAPTER },
1122 { "adapter_unsynced", "Adapter, not synced with system time", PCAP_TSTAMP_ADAPTER_UNSYNCED },
1127 pcap_tstamp_type_name_to_val(const char *name)
1131 for (i = 0; tstamp_type_choices[i].name != NULL; i++) {
1132 if (pcap_strcasecmp(tstamp_type_choices[i].name, name) == 0)
1133 return (tstamp_type_choices[i].type);
1135 return (PCAP_ERROR);
1139 pcap_tstamp_type_val_to_name(int tstamp_type)
1143 for (i = 0; tstamp_type_choices[i].name != NULL; i++) {
1144 if (tstamp_type_choices[i].type == tstamp_type)
1145 return (tstamp_type_choices[i].name);
1151 pcap_tstamp_type_val_to_description(int tstamp_type)
1155 for (i = 0; tstamp_type_choices[i].name != NULL; i++) {
1156 if (tstamp_type_choices[i].type == tstamp_type)
1157 return (tstamp_type_choices[i].description);
1163 pcap_snapshot(pcap_t *p)
1165 return (p->snapshot);
1169 pcap_is_swapped(pcap_t *p)
1171 return (p->sf.swapped);
1175 pcap_major_version(pcap_t *p)
1177 return (p->sf.version_major);
1181 pcap_minor_version(pcap_t *p)
1183 return (p->sf.version_minor);
1187 pcap_file(pcap_t *p)
1189 return (p->sf.rfile);
1193 pcap_fileno(pcap_t *p)
1198 if (p->adapter != NULL)
1199 return ((int)(DWORD)p->adapter->hFile);
1205 #if !defined(WIN32) && !defined(MSDOS)
1207 pcap_get_selectable_fd(pcap_t *p)
1209 return (p->selectable_fd);
1214 pcap_perror(pcap_t *p, char *prefix)
1216 fprintf(stderr, "%s: %s\n", prefix, p->errbuf);
1220 pcap_geterr(pcap_t *p)
1226 pcap_getnonblock(pcap_t *p, char *errbuf)
1230 ret = p->getnonblock_op(p, errbuf);
1233 * In case somebody depended on the bug wherein
1234 * the error message was put into p->errbuf
1235 * by pcap_getnonblock_fd().
1237 strlcpy(p->errbuf, errbuf, PCAP_ERRBUF_SIZE);
1243 * Get the current non-blocking mode setting, under the assumption that
1244 * it's just the standard POSIX non-blocking flag.
1246 * We don't look at "p->nonblock", in case somebody tweaked the FD
1249 #if !defined(WIN32) && !defined(MSDOS)
1251 pcap_getnonblock_fd(pcap_t *p, char *errbuf)
1255 fdflags = fcntl(p->fd, F_GETFL, 0);
1256 if (fdflags == -1) {
1257 snprintf(errbuf, PCAP_ERRBUF_SIZE, "F_GETFL: %s",
1258 pcap_strerror(errno));
1261 if (fdflags & O_NONBLOCK)
1269 pcap_setnonblock(pcap_t *p, int nonblock, char *errbuf)
1273 ret = p->setnonblock_op(p, nonblock, errbuf);
1276 * In case somebody depended on the bug wherein
1277 * the error message was put into p->errbuf
1278 * by pcap_setnonblock_fd().
1280 strlcpy(p->errbuf, errbuf, PCAP_ERRBUF_SIZE);
1285 #if !defined(WIN32) && !defined(MSDOS)
1287 * Set non-blocking mode, under the assumption that it's just the
1288 * standard POSIX non-blocking flag. (This can be called by the
1289 * per-platform non-blocking-mode routine if that routine also
1290 * needs to do some additional work.)
1293 pcap_setnonblock_fd(pcap_t *p, int nonblock, char *errbuf)
1297 fdflags = fcntl(p->fd, F_GETFL, 0);
1298 if (fdflags == -1) {
1299 snprintf(errbuf, PCAP_ERRBUF_SIZE, "F_GETFL: %s",
1300 pcap_strerror(errno));
1304 fdflags |= O_NONBLOCK;
1306 fdflags &= ~O_NONBLOCK;
1307 if (fcntl(p->fd, F_SETFL, fdflags) == -1) {
1308 snprintf(errbuf, PCAP_ERRBUF_SIZE, "F_SETFL: %s",
1309 pcap_strerror(errno));
1318 * Generate a string for the last Win32-specific error (i.e. an error generated when
1319 * calling a Win32 API).
1320 * For errors occurred during standard C calls, we still use pcap_strerror()
1323 pcap_win32strerror(void)
1326 static char errbuf[PCAP_ERRBUF_SIZE+1];
1330 error = GetLastError();
1331 FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, NULL, error, 0, errbuf,
1332 PCAP_ERRBUF_SIZE, NULL);
1335 * "FormatMessage()" "helpfully" sticks CR/LF at the end of the
1336 * message. Get rid of it.
1338 errlen = strlen(errbuf);
1340 errbuf[errlen - 1] = '\0';
1341 errbuf[errlen - 2] = '\0';
1343 p = strchr(errbuf, '\0');
1344 snprintf (p, sizeof(errbuf)-(p-errbuf), " (%lu)", error);
1350 * Generate error strings for PCAP_ERROR_ and PCAP_WARNING_ values.
1353 pcap_statustostr(int errnum)
1355 static char ebuf[15+10+1];
1360 return("Generic warning");
1362 case PCAP_WARNING_TSTAMP_TYPE_NOTSUP:
1363 return ("That type of time stamp is not supported by that device");
1365 case PCAP_WARNING_PROMISC_NOTSUP:
1366 return ("That device doesn't support promiscuous mode");
1369 return("Generic error");
1371 case PCAP_ERROR_BREAK:
1372 return("Loop terminated by pcap_breakloop");
1374 case PCAP_ERROR_NOT_ACTIVATED:
1375 return("The pcap_t has not been activated");
1377 case PCAP_ERROR_ACTIVATED:
1378 return ("The setting can't be changed after the pcap_t is activated");
1380 case PCAP_ERROR_NO_SUCH_DEVICE:
1381 return ("No such device exists");
1383 case PCAP_ERROR_RFMON_NOTSUP:
1384 return ("That device doesn't support monitor mode");
1386 case PCAP_ERROR_NOT_RFMON:
1387 return ("That operation is supported only in monitor mode");
1389 case PCAP_ERROR_PERM_DENIED:
1390 return ("You don't have permission to capture on that device");
1392 case PCAP_ERROR_IFACE_NOT_UP:
1393 return ("That device is not up");
1395 case PCAP_ERROR_CANTSET_TSTAMP_TYPE:
1396 return ("That device doesn't support setting the time stamp type");
1398 case PCAP_ERROR_PROMISC_PERM_DENIED:
1399 return ("You don't have permission to capture in promiscuous mode on that device");
1401 (void)snprintf(ebuf, sizeof ebuf, "Unknown error: %d", errnum);
1406 * Not all systems have strerror().
1409 pcap_strerror(int errnum)
1411 #ifdef HAVE_STRERROR
1412 return (strerror(errnum));
1414 extern int sys_nerr;
1415 extern const char *const sys_errlist[];
1416 static char ebuf[15+10+1];
1418 if ((unsigned int)errnum < sys_nerr)
1419 return ((char *)sys_errlist[errnum]);
1420 (void)snprintf(ebuf, sizeof ebuf, "Unknown error: %d", errnum);
1426 pcap_setfilter(pcap_t *p, struct bpf_program *fp)
1428 return (p->setfilter_op(p, fp));
1432 * Set direction flag, which controls whether we accept only incoming
1433 * packets, only outgoing packets, or both.
1434 * Note that, depending on the platform, some or all direction arguments
1435 * might not be supported.
1438 pcap_setdirection(pcap_t *p, pcap_direction_t d)
1440 if (p->setdirection_op == NULL) {
1441 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
1442 "Setting direction is not implemented on this platform");
1445 return (p->setdirection_op(p, d));
1449 pcap_stats(pcap_t *p, struct pcap_stat *ps)
1451 return (p->stats_op(p, ps));
1455 pcap_stats_dead(pcap_t *p, struct pcap_stat *ps _U_)
1457 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
1458 "Statistics aren't available from a pcap_open_dead pcap_t");
1464 pcap_setbuff(pcap_t *p, int dim)
1466 return (p->setbuff_op(p, dim));
1470 pcap_setbuff_dead(pcap_t *p, int dim)
1472 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
1473 "The kernel buffer size cannot be set on a pcap_open_dead pcap_t");
1478 pcap_setmode(pcap_t *p, int mode)
1480 return (p->setmode_op(p, mode));
1484 pcap_setmode_dead(pcap_t *p, int mode)
1486 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
1487 "impossible to set mode on a pcap_open_dead pcap_t");
1492 pcap_setmintocopy(pcap_t *p, int size)
1494 return (p->setmintocopy_op(p, size));
1498 pcap_setmintocopy_dead(pcap_t *p, int size)
1500 snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
1501 "The mintocopy parameter cannot be set on a pcap_open_dead pcap_t");
1507 * On some platforms, we need to clean up promiscuous or monitor mode
1508 * when we close a device - and we want that to happen even if the
1509 * application just exits without explicitl closing devices.
1510 * On those platforms, we need to register a "close all the pcaps"
1511 * routine to be called when we exit, and need to maintain a list of
1512 * pcaps that need to be closed to clean up modes.
1514 * XXX - not thread-safe.
1518 * List of pcaps on which we've done something that needs to be
1520 * If there are any such pcaps, we arrange to call "pcap_close_all()"
1521 * when we exit, and have it close all of them.
1523 static struct pcap *pcaps_to_close;
1526 * TRUE if we've already called "atexit()" to cause "pcap_close_all()" to
1527 * be called on exit.
1529 static int did_atexit;
1532 pcap_close_all(void)
1534 struct pcap *handle;
1536 while ((handle = pcaps_to_close) != NULL)
1541 pcap_do_addexit(pcap_t *p)
1544 * If we haven't already done so, arrange to have
1545 * "pcap_close_all()" called when we exit.
1548 if (atexit(pcap_close_all) == -1) {
1550 * "atexit()" failed; let our caller know.
1552 strncpy(p->errbuf, "atexit failed",
1562 pcap_add_to_pcaps_to_close(pcap_t *p)
1564 p->md.next = pcaps_to_close;
1569 pcap_remove_from_pcaps_to_close(pcap_t *p)
1571 pcap_t *pc, *prevpc;
1573 for (pc = pcaps_to_close, prevpc = NULL; pc != NULL;
1574 prevpc = pc, pc = pc->md.next) {
1577 * Found it. Remove it from the list.
1579 if (prevpc == NULL) {
1581 * It was at the head of the list.
1583 pcaps_to_close = pc->md.next;
1586 * It was in the middle of the list.
1588 prevpc->md.next = pc->md.next;
1596 pcap_cleanup_live_common(pcap_t *p)
1598 if (p->buffer != NULL) {
1602 if (p->dlt_list != NULL) {
1607 if (p->tstamp_type_list != NULL) {
1608 free(p->tstamp_type_list);
1609 p->tstamp_type_list = NULL;
1610 p->tstamp_type_count = 0;
1612 pcap_freecode(&p->fcode);
1613 #if !defined(WIN32) && !defined(MSDOS)
1618 p->selectable_fd = -1;
1624 pcap_cleanup_dead(pcap_t *p _U_)
1626 /* Nothing to do. */
1630 pcap_open_dead(int linktype, int snaplen)
1634 p = malloc(sizeof(*p));
1637 memset (p, 0, sizeof(*p));
1638 p->snapshot = snaplen;
1639 p->linktype = linktype;
1640 p->stats_op = pcap_stats_dead;
1642 p->setbuff_op = pcap_setbuff_dead;
1643 p->setmode_op = pcap_setmode_dead;
1644 p->setmintocopy_op = pcap_setmintocopy_dead;
1646 p->cleanup_op = pcap_cleanup_dead;
1652 * API compatible with WinPcap's "send a packet" routine - returns -1
1653 * on error, 0 otherwise.
1655 * XXX - what if we get a short write?
1658 pcap_sendpacket(pcap_t *p, const u_char *buf, int size)
1660 if (p->inject_op(p, buf, size) == -1)
1666 * API compatible with OpenBSD's "send a packet" routine - returns -1 on
1667 * error, number of bytes written otherwise.
1670 pcap_inject(pcap_t *p, const void *buf, size_t size)
1672 return (p->inject_op(p, buf, size));
1676 pcap_close(pcap_t *p)
1678 if (p->opt.source != NULL)
1679 free(p->opt.source);
1685 * Given a BPF program, a pcap_pkthdr structure for a packet, and the raw
1686 * data for the packet, check whether the packet passes the filter.
1687 * Returns the return value of the filter program, which will be zero if
1688 * the packet doesn't pass and non-zero if the packet does pass.
1691 pcap_offline_filter(const struct bpf_program *fp, const struct pcap_pkthdr *h,
1694 const struct bpf_insn *fcode = fp->bf_insns;
1697 return (bpf_filter(fcode, pkt, h->len, h->caplen));
1703 * We make the version string static, and return a pointer to it, rather
1704 * than exporting the version string directly. On at least some UNIXes,
1705 * if you import data from a shared library into an program, the data is
1706 * bound into the program binary, so if the string in the version of the
1707 * library with which the program was linked isn't the same as the
1708 * string in the version of the library with which the program is being
1709 * run, various undesirable things may happen (warnings, the string
1710 * being the one from the version of the library with which the program
1711 * was linked, or even weirder things, such as the string being the one
1712 * from the library but being truncated).
1714 #ifdef HAVE_VERSION_H
1715 #include "version.h"
1717 static const char pcap_version_string[] = "libpcap version 1.x.y";
1722 * XXX - it'd be nice if we could somehow generate the WinPcap and libpcap
1723 * version numbers when building WinPcap. (It'd be nice to do so for
1724 * the packet.dll version number as well.)
1726 static const char wpcap_version_string[] = "4.0";
1727 static const char pcap_version_string_fmt[] =
1728 "WinPcap version %s, based on %s";
1729 static const char pcap_version_string_packet_dll_fmt[] =
1730 "WinPcap version %s (packet.dll version %s), based on %s";
1731 static char *full_pcap_version_string;
1734 pcap_lib_version(void)
1736 char *packet_version_string;
1737 size_t full_pcap_version_string_len;
1739 if (full_pcap_version_string == NULL) {
1741 * Generate the version string.
1743 packet_version_string = PacketGetVersion();
1744 if (strcmp(wpcap_version_string, packet_version_string) == 0) {
1746 * WinPcap version string and packet.dll version
1747 * string are the same; just report the WinPcap
1750 full_pcap_version_string_len =
1751 (sizeof pcap_version_string_fmt - 4) +
1752 strlen(wpcap_version_string) +
1753 strlen(pcap_version_string);
1754 full_pcap_version_string =
1755 malloc(full_pcap_version_string_len);
1756 sprintf(full_pcap_version_string,
1757 pcap_version_string_fmt, wpcap_version_string,
1758 pcap_version_string);
1761 * WinPcap version string and packet.dll version
1762 * string are different; that shouldn't be the
1763 * case (the two libraries should come from the
1764 * same version of WinPcap), so we report both
1767 full_pcap_version_string_len =
1768 (sizeof pcap_version_string_packet_dll_fmt - 6) +
1769 strlen(wpcap_version_string) +
1770 strlen(packet_version_string) +
1771 strlen(pcap_version_string);
1772 full_pcap_version_string = malloc(full_pcap_version_string_len);
1774 sprintf(full_pcap_version_string,
1775 pcap_version_string_packet_dll_fmt,
1776 wpcap_version_string, packet_version_string,
1777 pcap_version_string);
1780 return (full_pcap_version_string);
1783 #elif defined(MSDOS)
1785 static char *full_pcap_version_string;
1788 pcap_lib_version (void)
1790 char *packet_version_string;
1791 size_t full_pcap_version_string_len;
1792 static char dospfx[] = "DOS-";
1794 if (full_pcap_version_string == NULL) {
1796 * Generate the version string.
1798 full_pcap_version_string_len =
1799 sizeof dospfx + strlen(pcap_version_string);
1800 full_pcap_version_string =
1801 malloc(full_pcap_version_string_len);
1802 strcpy(full_pcap_version_string, dospfx);
1803 strcat(full_pcap_version_string, pcap_version_string);
1805 return (full_pcap_version_string);
1811 pcap_lib_version(void)
1813 return (pcap_version_string);