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
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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
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30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 #include <pcap-types.h>
40 #include <sys/param.h>
44 #include <sys/ioctl.h>
45 #include <sys/socket.h>
46 #ifdef HAVE_SYS_SOCKIO_H
47 #include <sys/sockio.h>
50 struct mbuf; /* Squelch compiler warnings on some platforms for */
51 struct rtentry; /* declarations in <net/if.h> */
53 #include <netinet/in.h>
60 #if !defined(_MSC_VER) && !defined(__BORLANDC__) && !defined(__MINGW32__)
68 #define INT_MAX 2147483647
71 #ifdef HAVE_OS_PROTO_H
85 #endif /* HAVE_DAG_API */
87 #ifdef HAVE_SEPTEL_API
88 #include "pcap-septel.h"
89 #endif /* HAVE_SEPTEL_API */
93 #endif /* HAVE_SNF_API */
97 #endif /* HAVE_TC_API */
99 #ifdef PCAP_SUPPORT_USB
100 #include "pcap-usb-linux.h"
103 #ifdef PCAP_SUPPORT_BT
104 #include "pcap-bt-linux.h"
107 #ifdef PCAP_SUPPORT_BT_MONITOR
108 #include "pcap-bt-monitor-linux.h"
111 #ifdef PCAP_SUPPORT_NETFILTER
112 #include "pcap-netfilter-linux.h"
115 #ifdef PCAP_SUPPORT_NETMAP
116 #include "pcap-netmap.h"
119 #ifdef PCAP_SUPPORT_DBUS
120 #include "pcap-dbus.h"
123 #ifdef PCAP_SUPPORT_RDMASNIFF
124 #include "pcap-rdmasniff.h"
129 * DllMain(), required when built as a Windows DLL.
142 * Exported in case some applications using WinPcap/Npcap called it,
143 * even though it wasn't exported.
148 WORD wVersionRequested;
156 wVersionRequested = MAKEWORD( 1, 1);
157 err = WSAStartup( wVersionRequested, &wsaData );
158 atexit ((void(*)(void))WSACleanup);
167 * This is the exported function; new programs should call this.
172 return (wsockinit());
177 * String containing the library version.
178 * Not explicitly exported via a header file - the right API to use
179 * is pcap_lib_version() - but some programs included it, so we
182 * We declare it here, right before defining it, to squelch any
183 * warnings we might get from compilers about the lack of a
186 PCAP_API char pcap_version[];
187 PCAP_API_DEF char pcap_version[] = PACKAGE_VERSION;
190 pcap_set_not_initialized_message(pcap_t *pcap)
192 if (pcap->activated) {
193 /* A module probably forgot to set the function pointer */
194 (void)pcap_snprintf(pcap->errbuf, sizeof(pcap->errbuf),
195 "This operation isn't properly handled by that device");
198 /* in case the caller doesn't check for PCAP_ERROR_NOT_ACTIVATED */
199 (void)pcap_snprintf(pcap->errbuf, sizeof(pcap->errbuf),
200 "This handle hasn't been activated yet");
204 pcap_read_not_initialized(pcap_t *pcap, int cnt _U_, pcap_handler callback _U_,
207 pcap_set_not_initialized_message(pcap);
208 /* this means 'not initialized' */
209 return (PCAP_ERROR_NOT_ACTIVATED);
213 pcap_inject_not_initialized(pcap_t *pcap, const void * buf _U_, size_t size _U_)
215 pcap_set_not_initialized_message(pcap);
216 /* this means 'not initialized' */
217 return (PCAP_ERROR_NOT_ACTIVATED);
221 pcap_setfilter_not_initialized(pcap_t *pcap, struct bpf_program *fp _U_)
223 pcap_set_not_initialized_message(pcap);
224 /* this means 'not initialized' */
225 return (PCAP_ERROR_NOT_ACTIVATED);
229 pcap_setdirection_not_initialized(pcap_t *pcap, pcap_direction_t d _U_)
231 pcap_set_not_initialized_message(pcap);
232 /* this means 'not initialized' */
233 return (PCAP_ERROR_NOT_ACTIVATED);
237 pcap_set_datalink_not_initialized(pcap_t *pcap, int dlt _U_)
239 pcap_set_not_initialized_message(pcap);
240 /* this means 'not initialized' */
241 return (PCAP_ERROR_NOT_ACTIVATED);
245 pcap_getnonblock_not_initialized(pcap_t *pcap)
247 pcap_set_not_initialized_message(pcap);
248 /* this means 'not initialized' */
249 return (PCAP_ERROR_NOT_ACTIVATED);
253 pcap_stats_not_initialized(pcap_t *pcap, struct pcap_stat *ps _U_)
255 pcap_set_not_initialized_message(pcap);
256 /* this means 'not initialized' */
257 return (PCAP_ERROR_NOT_ACTIVATED);
262 pcap_stats_ex_not_initialized(pcap_t *pcap, int *pcap_stat_size _U_)
264 pcap_set_not_initialized_message(pcap);
269 pcap_setbuff_not_initialized(pcap_t *pcap, int dim _U_)
271 pcap_set_not_initialized_message(pcap);
272 /* this means 'not initialized' */
273 return (PCAP_ERROR_NOT_ACTIVATED);
277 pcap_setmode_not_initialized(pcap_t *pcap, int mode _U_)
279 pcap_set_not_initialized_message(pcap);
280 /* this means 'not initialized' */
281 return (PCAP_ERROR_NOT_ACTIVATED);
285 pcap_setmintocopy_not_initialized(pcap_t *pcap, int size _U_)
287 pcap_set_not_initialized_message(pcap);
288 /* this means 'not initialized' */
289 return (PCAP_ERROR_NOT_ACTIVATED);
293 pcap_getevent_not_initialized(pcap_t *pcap)
295 pcap_set_not_initialized_message(pcap);
296 return (INVALID_HANDLE_VALUE);
300 pcap_oid_get_request_not_initialized(pcap_t *pcap, bpf_u_int32 oid _U_,
301 void *data _U_, size_t *lenp _U_)
303 pcap_set_not_initialized_message(pcap);
304 return (PCAP_ERROR_NOT_ACTIVATED);
308 pcap_oid_set_request_not_initialized(pcap_t *pcap, bpf_u_int32 oid _U_,
309 const void *data _U_, size_t *lenp _U_)
311 pcap_set_not_initialized_message(pcap);
312 return (PCAP_ERROR_NOT_ACTIVATED);
316 pcap_sendqueue_transmit_not_initialized(pcap_t *pcap, pcap_send_queue* queue, int sync)
318 pcap_set_not_initialized_message(pcap);
323 pcap_setuserbuffer_not_initialized(pcap_t *pcap, int size _U_)
325 pcap_set_not_initialized_message(pcap);
326 return (PCAP_ERROR_NOT_ACTIVATED);
330 pcap_live_dump_not_initialized(pcap_t *pcap, char *filename _U_, int maxsize _U_,
333 pcap_set_not_initialized_message(pcap);
334 return (PCAP_ERROR_NOT_ACTIVATED);
338 pcap_live_dump_ended_not_initialized(pcap_t *pcap, int sync _U_)
340 pcap_set_not_initialized_message(pcap);
341 return (PCAP_ERROR_NOT_ACTIVATED);
344 static PAirpcapHandle
345 pcap_get_airpcap_handle_not_initialized(pcap_t *pcap)
347 pcap_set_not_initialized_message(pcap);
353 * Returns 1 if rfmon mode can be set on the pcap_t, 0 if it can't,
354 * a PCAP_ERROR value on an error.
357 pcap_can_set_rfmon(pcap_t *p)
359 return (p->can_set_rfmon_op(p));
363 * For systems where rfmon mode is never supported.
366 pcap_cant_set_rfmon(pcap_t *p _U_)
372 * Sets *tstamp_typesp to point to an array 1 or more supported time stamp
373 * types; the return value is the number of supported time stamp types.
374 * The list should be freed by a call to pcap_free_tstamp_types() when
375 * you're done with it.
377 * A return value of 0 means "you don't get a choice of time stamp type",
378 * in which case *tstamp_typesp is set to null.
380 * PCAP_ERROR is returned on error.
383 pcap_list_tstamp_types(pcap_t *p, int **tstamp_typesp)
385 if (p->tstamp_type_count == 0) {
387 * We don't support multiple time stamp types.
388 * That means the only type we support is PCAP_TSTAMP_HOST;
389 * set up a list containing only that type.
391 *tstamp_typesp = (int*)malloc(sizeof(**tstamp_typesp));
392 if (*tstamp_typesp == NULL) {
393 pcap_fmt_errmsg_for_errno(p->errbuf, sizeof(p->errbuf),
397 **tstamp_typesp = PCAP_TSTAMP_HOST;
400 *tstamp_typesp = (int*)calloc(sizeof(**tstamp_typesp),
401 p->tstamp_type_count);
402 if (*tstamp_typesp == NULL) {
403 pcap_fmt_errmsg_for_errno(p->errbuf, sizeof(p->errbuf),
407 (void)memcpy(*tstamp_typesp, p->tstamp_type_list,
408 sizeof(**tstamp_typesp) * p->tstamp_type_count);
409 return (p->tstamp_type_count);
414 * In Windows, you might have a library built with one version of the
415 * C runtime library and an application built with another version of
416 * the C runtime library, which means that the library might use one
417 * version of malloc() and free() and the application might use another
418 * version of malloc() and free(). If so, that means something
419 * allocated by the library cannot be freed by the application, so we
420 * need to have a pcap_free_tstamp_types() routine to free up the list
421 * allocated by pcap_list_tstamp_types(), even though it's just a wrapper
425 pcap_free_tstamp_types(int *tstamp_type_list)
427 free(tstamp_type_list);
431 * Default one-shot callback; overridden for capture types where the
432 * packet data cannot be guaranteed to be available after the callback
433 * returns, so that a copy must be made.
436 pcap_oneshot(u_char *user, const struct pcap_pkthdr *h, const u_char *pkt)
438 struct oneshot_userdata *sp = (struct oneshot_userdata *)user;
445 pcap_next(pcap_t *p, struct pcap_pkthdr *h)
447 struct oneshot_userdata s;
453 if (pcap_dispatch(p, 1, p->oneshot_callback, (u_char *)&s) <= 0)
459 pcap_next_ex(pcap_t *p, struct pcap_pkthdr **pkt_header,
460 const u_char **pkt_data)
462 struct oneshot_userdata s;
464 s.hdr = &p->pcap_header;
468 /* Saves a pointer to the packet headers */
469 *pkt_header= &p->pcap_header;
471 if (p->rfile != NULL) {
474 /* We are on an offline capture */
475 status = pcap_offline_read(p, 1, p->oneshot_callback,
479 * Return codes for pcap_offline_read() are:
483 * The first one ('0') conflicts with the return code of
484 * 0 from pcap_read() meaning "no packets arrived before
485 * the timeout expired", so we map it to -2 so you can
486 * distinguish between an EOF from a savefile and a
487 * "no packets arrived before the timeout expired, try
488 * again" from a live capture.
497 * Return codes for pcap_read() are:
500 * - -2: loop was broken out of with pcap_breakloop()
502 * The first one ('0') conflicts with the return code of 0 from
503 * pcap_offline_read() meaning "end of file".
505 return (p->read_op(p, 1, p->oneshot_callback, (u_char *)&s));
509 * Implementation of a pcap_if_list_t.
511 struct pcap_if_list {
512 pcap_if_t *beginning;
515 static struct capture_source_type {
516 int (*findalldevs_op)(pcap_if_list_t *, char *);
517 pcap_t *(*create_op)(const char *, char *, int *);
518 } capture_source_types[] = {
520 { dag_findalldevs, dag_create },
522 #ifdef HAVE_SEPTEL_API
523 { septel_findalldevs, septel_create },
526 { snf_findalldevs, snf_create },
529 { TcFindAllDevs, TcCreate },
531 #ifdef PCAP_SUPPORT_BT
532 { bt_findalldevs, bt_create },
534 #ifdef PCAP_SUPPORT_BT_MONITOR
535 { bt_monitor_findalldevs, bt_monitor_create },
537 #ifdef PCAP_SUPPORT_USB
538 { usb_findalldevs, usb_create },
540 #ifdef PCAP_SUPPORT_NETFILTER
541 { netfilter_findalldevs, netfilter_create },
543 #ifdef PCAP_SUPPORT_NETMAP
544 { pcap_netmap_findalldevs, pcap_netmap_create },
546 #ifdef PCAP_SUPPORT_DBUS
547 { dbus_findalldevs, dbus_create },
549 #ifdef PCAP_SUPPORT_RDMASNIFF
550 { rdmasniff_findalldevs, rdmasniff_create },
556 * Get a list of all capture sources that are up and that we can open.
557 * Returns -1 on error, 0 otherwise.
558 * The list, as returned through "alldevsp", may be null if no interfaces
559 * were up and could be opened.
562 pcap_findalldevs(pcap_if_t **alldevsp, char *errbuf)
565 pcap_if_list_t devlist;
568 * Find all the local network interfaces on which we
571 devlist.beginning = NULL;
572 if (pcap_platform_finddevs(&devlist, errbuf) == -1) {
574 * Failed - free all of the entries we were given
577 if (devlist.beginning != NULL)
578 pcap_freealldevs(devlist.beginning);
584 * Ask each of the non-local-network-interface capture
585 * source types what interfaces they have.
587 for (i = 0; capture_source_types[i].findalldevs_op != NULL; i++) {
588 if (capture_source_types[i].findalldevs_op(&devlist, errbuf) == -1) {
590 * We had an error; free the list we've been
593 if (devlist.beginning != NULL)
594 pcap_freealldevs(devlist.beginning);
601 * Return the first entry of the list of all devices.
603 *alldevsp = devlist.beginning;
607 static struct sockaddr *
608 dup_sockaddr(struct sockaddr *sa, size_t sa_length)
610 struct sockaddr *newsa;
612 if ((newsa = malloc(sa_length)) == NULL)
614 return (memcpy(newsa, sa, sa_length));
618 * Construct a "figure of merit" for an interface, for use when sorting
619 * the list of interfaces, in which interfaces that are up are superior
620 * to interfaces that aren't up, interfaces that are up and running are
621 * superior to interfaces that are up but not running, and non-loopback
622 * interfaces that are up and running are superior to loopback interfaces,
623 * and interfaces with the same flags have a figure of merit that's higher
624 * the lower the instance number.
626 * The goal is to try to put the interfaces most likely to be useful for
627 * capture at the beginning of the list.
629 * The figure of merit, which is lower the "better" the interface is,
630 * has the uppermost bit set if the interface isn't running, the bit
631 * below that set if the interface isn't up, the bit below that set
632 * if the interface is a loopback interface, and the interface index
633 * in the 29 bits below that. (Yes, we assume u_int is 32 bits.)
636 get_figure_of_merit(pcap_if_t *dev)
641 if (strcmp(dev->name, "any") == 0) {
643 * Give the "any" device an artificially high instance
644 * number, so it shows up after all other non-loopback
647 n = 0x1FFFFFFF; /* 29 all-1 bits */
650 * A number at the end of the device name string is
651 * assumed to be an instance number. Add 1 to the
652 * instance number, and use 0 for "no instance
653 * number", so we don't put "no instance number"
654 * devices and "instance 0" devices together.
656 cp = dev->name + strlen(dev->name) - 1;
657 while (cp-1 >= dev->name && *(cp-1) >= '0' && *(cp-1) <= '9')
659 if (*cp >= '0' && *cp <= '9')
664 if (!(dev->flags & PCAP_IF_RUNNING))
666 if (!(dev->flags & PCAP_IF_UP))
670 * Give non-wireless interfaces that aren't disconnected a better
671 * figure of merit than interfaces that are disconnected, as
672 * "disconnected" should indicate that the interface isn't
673 * plugged into a network and thus won't give you any traffic.
675 * For wireless interfaces, it means "associated with a network",
676 * which we presume not to necessarily prevent capture, as you
677 * might run the adapter in some flavor of monitor mode.
679 if (!(dev->flags & PCAP_IF_WIRELESS) &&
680 (dev->flags & PCAP_IF_CONNECTION_STATUS) == PCAP_IF_CONNECTION_STATUS_DISCONNECTED)
684 * Sort loopback devices after non-loopback devices, *except* for
685 * disconnected devices.
687 if (dev->flags & PCAP_IF_LOOPBACK)
695 * Try to get a description for a given device.
696 * Returns a mallocated description if it could and NULL if it couldn't.
698 * XXX - on FreeBSDs that support it, should it get the sysctl named
699 * "dev.{adapter family name}.{adapter unit}.%desc" to get a description
700 * of the adapter? Note that "dev.an.0.%desc" is "Aironet PC4500/PC4800"
701 * with my Cisco 350 card, so the name isn't entirely descriptive. The
702 * "dev.an.0.%pnpinfo" has a better description, although one might argue
703 * that the problem is really a driver bug - if it can find out that it's
704 * a Cisco 340 or 350, rather than an old Aironet card, it should use
705 * that in the description.
707 * Do NetBSD, DragonflyBSD, or OpenBSD support this as well? FreeBSD
708 * and OpenBSD let you get a description, but it's not generated by the OS,
709 * it's set with another ioctl that ifconfig supports; we use that to get
710 * a description in FreeBSD and OpenBSD, but if there is no such
711 * description available, it still might be nice to get some description
712 * string based on the device type or something such as that.
714 * In macOS, the System Configuration framework can apparently return
715 * names in 10.4 and later.
717 * It also appears that freedesktop.org's HAL offers an "info.product"
718 * string, but the HAL specification says it "should not be used in any
719 * UI" and "subsystem/capability specific properties" should be used
720 * instead and, in any case, I think HAL is being deprecated in
721 * favor of other stuff such as DeviceKit. DeviceKit doesn't appear
722 * to have any obvious product information for devices, but maybe
723 * I haven't looked hard enough.
725 * Using the System Configuration framework, or HAL, or DeviceKit, or
726 * whatever, would require that libpcap applications be linked with
727 * the frameworks/libraries in question. That shouldn't be a problem
728 * for programs linking with the shared version of libpcap (unless
729 * you're running on AIX - which I think is the only UN*X that doesn't
730 * support linking a shared library with other libraries on which it
731 * depends, and having an executable linked only with the first shared
732 * library automatically pick up the other libraries when started -
733 * and using HAL or whatever). Programs linked with the static
734 * version of libpcap would have to use pcap-config with the --static
735 * flag in order to get the right linker flags in order to pick up
736 * the additional libraries/frameworks; those programs need that anyway
737 * for libpcap 1.1 and beyond on Linux, as, by default, it requires
740 * Do any other UN*Xes, or desktop environments support getting a
745 get_if_description(const char *name)
747 char *description = NULL;
749 struct ifreq ifrdesc;
751 size_t descrlen = 64;
753 size_t descrlen = IFDESCRSIZE;
754 #endif /* IFDESCRSIZE */
757 * Get the description for the interface.
759 memset(&ifrdesc, 0, sizeof ifrdesc);
760 pcap_strlcpy(ifrdesc.ifr_name, name, sizeof ifrdesc.ifr_name);
761 s = socket(AF_INET, SOCK_DGRAM, 0);
765 * On FreeBSD, if the buffer isn't big enough for the
766 * description, the ioctl succeeds, but the description
767 * isn't copied, ifr_buffer.length is set to the description
768 * length, and ifr_buffer.buffer is set to NULL.
772 if ((description = malloc(descrlen)) != NULL) {
773 ifrdesc.ifr_buffer.buffer = description;
774 ifrdesc.ifr_buffer.length = descrlen;
775 if (ioctl(s, SIOCGIFDESCR, &ifrdesc) == 0) {
776 if (ifrdesc.ifr_buffer.buffer ==
780 descrlen = ifrdesc.ifr_buffer.length;
783 * Failed to get interface description.
792 #else /* __FreeBSD__ */
794 * The only other OS that currently supports
795 * SIOCGIFDESCR is OpenBSD, and it has no way
796 * to get the description length - it's clamped
797 * to a maximum of IFDESCRSIZE.
799 if ((description = malloc(descrlen)) != NULL) {
800 ifrdesc.ifr_data = (caddr_t)description;
801 if (ioctl(s, SIOCGIFDESCR, &ifrdesc) != 0) {
803 * Failed to get interface description.
809 #endif /* __FreeBSD__ */
811 if (description != NULL && description[0] == '\0') {
813 * Description is empty, so discard it.
822 * For FreeBSD, if we didn't get a description, and this is
823 * a device with a name of the form usbusN, label it as a USB
826 if (description == NULL) {
827 if (strncmp(name, "usbus", 5) == 0) {
829 * OK, it begins with "usbus".
835 busnum = strtol(name + 5, &p, 10);
836 if (errno == 0 && p != name + 5 && *p == '\0' &&
837 busnum >= 0 && busnum <= INT_MAX) {
839 * OK, it's a valid number that's not
840 * bigger than INT_MAX. Construct
841 * a description from it.
842 * (If that fails, we don't worry about
843 * it, we just return NULL.)
845 if (pcap_asprintf(&description,
846 "USB bus number %ld", busnum) == -1) {
854 return (description);
855 #else /* SIOCGIFDESCR */
856 get_if_description(const char *name _U_)
859 #endif /* SIOCGIFDESCR */
863 * Look for a given device in the specified list of devices.
865 * If we find it, return a pointer to its entry.
867 * If we don't find it, attempt to add an entry for it, with the specified
868 * IFF_ flags and description, and, if that succeeds, return a pointer to
869 * the new entry, otherwise return NULL and set errbuf to an error message.
872 find_or_add_if(pcap_if_list_t *devlistp, const char *name,
873 bpf_u_int32 if_flags, get_if_flags_func get_flags_func, char *errbuf)
875 bpf_u_int32 pcap_flags;
878 * Convert IFF_ flags to pcap flags.
882 if (if_flags & IFF_LOOPBACK)
883 pcap_flags |= PCAP_IF_LOOPBACK;
886 * We don't have IFF_LOOPBACK, so look at the device name to
887 * see if it looks like a loopback device.
889 if (name[0] == 'l' && name[1] == 'o' &&
890 (isdigit((unsigned char)(name[2])) || name[2] == '\0')
891 pcap_flags |= PCAP_IF_LOOPBACK;
894 if (if_flags & IFF_UP)
895 pcap_flags |= PCAP_IF_UP;
898 if (if_flags & IFF_RUNNING)
899 pcap_flags |= PCAP_IF_RUNNING;
903 * Attempt to find an entry for this device; if we don't find one,
904 * attempt to add one.
906 return (find_or_add_dev(devlistp, name, pcap_flags,
907 get_flags_func, get_if_description(name), errbuf));
911 * Look for a given device in the specified list of devices.
913 * If we find it, then, if the specified address isn't null, add it to
914 * the list of addresses for the device and return 0.
916 * If we don't find it, attempt to add an entry for it, with the specified
917 * IFF_ flags and description, and, if that succeeds, add the specified
918 * address to its list of addresses if that address is non-null, and
919 * return 0, otherwise return -1 and set errbuf to an error message.
921 * (We can get called with a null address because we might get a list
922 * of interface name/address combinations from the underlying OS, with
923 * the address being absent in some cases, rather than a list of
924 * interfaces with each interface having a list of addresses, so this
925 * call may be the only call made to add to the list, and we want to
926 * add interfaces even if they have no addresses.)
929 add_addr_to_if(pcap_if_list_t *devlistp, const char *name,
930 bpf_u_int32 if_flags, get_if_flags_func get_flags_func,
931 struct sockaddr *addr, size_t addr_size,
932 struct sockaddr *netmask, size_t netmask_size,
933 struct sockaddr *broadaddr, size_t broadaddr_size,
934 struct sockaddr *dstaddr, size_t dstaddr_size,
940 * Check whether the device exists and, if not, add it.
942 curdev = find_or_add_if(devlistp, name, if_flags, get_flags_func,
944 if (curdev == NULL) {
953 * There's no address to add; this entry just meant
954 * "here's a new interface".
960 * "curdev" is an entry for this interface, and we have an
961 * address for it; add an entry for that address to the
962 * interface's list of addresses.
964 return (add_addr_to_dev(curdev, addr, addr_size, netmask,
965 netmask_size, broadaddr, broadaddr_size, dstaddr,
966 dstaddr_size, errbuf));
971 * Add an entry to the list of addresses for an interface.
972 * "curdev" is the entry for that interface.
975 add_addr_to_dev(pcap_if_t *curdev,
976 struct sockaddr *addr, size_t addr_size,
977 struct sockaddr *netmask, size_t netmask_size,
978 struct sockaddr *broadaddr, size_t broadaddr_size,
979 struct sockaddr *dstaddr, size_t dstaddr_size,
982 pcap_addr_t *curaddr, *prevaddr, *nextaddr;
985 * Allocate the new entry and fill it in.
987 curaddr = (pcap_addr_t *)malloc(sizeof(pcap_addr_t));
988 if (curaddr == NULL) {
989 pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
994 curaddr->next = NULL;
995 if (addr != NULL && addr_size != 0) {
996 curaddr->addr = (struct sockaddr *)dup_sockaddr(addr, addr_size);
997 if (curaddr->addr == NULL) {
998 pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
1004 curaddr->addr = NULL;
1006 if (netmask != NULL && netmask_size != 0) {
1007 curaddr->netmask = (struct sockaddr *)dup_sockaddr(netmask, netmask_size);
1008 if (curaddr->netmask == NULL) {
1009 pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
1011 if (curaddr->addr != NULL)
1012 free(curaddr->addr);
1017 curaddr->netmask = NULL;
1019 if (broadaddr != NULL && broadaddr_size != 0) {
1020 curaddr->broadaddr = (struct sockaddr *)dup_sockaddr(broadaddr, broadaddr_size);
1021 if (curaddr->broadaddr == NULL) {
1022 pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
1024 if (curaddr->netmask != NULL)
1025 free(curaddr->netmask);
1026 if (curaddr->addr != NULL)
1027 free(curaddr->addr);
1032 curaddr->broadaddr = NULL;
1034 if (dstaddr != NULL && dstaddr_size != 0) {
1035 curaddr->dstaddr = (struct sockaddr *)dup_sockaddr(dstaddr, dstaddr_size);
1036 if (curaddr->dstaddr == NULL) {
1037 pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
1039 if (curaddr->broadaddr != NULL)
1040 free(curaddr->broadaddr);
1041 if (curaddr->netmask != NULL)
1042 free(curaddr->netmask);
1043 if (curaddr->addr != NULL)
1044 free(curaddr->addr);
1049 curaddr->dstaddr = NULL;
1052 * Find the end of the list of addresses.
1054 for (prevaddr = curdev->addresses; prevaddr != NULL; prevaddr = nextaddr) {
1055 nextaddr = prevaddr->next;
1056 if (nextaddr == NULL) {
1058 * This is the end of the list.
1064 if (prevaddr == NULL) {
1066 * The list was empty; this is the first member.
1068 curdev->addresses = curaddr;
1071 * "prevaddr" is the last member of the list; append
1072 * this member to it.
1074 prevaddr->next = curaddr;
1081 * Look for a given device in the specified list of devices.
1083 * If we find it, return 0 and set *curdev_ret to point to it.
1085 * If we don't find it, attempt to add an entry for it, with the specified
1086 * flags and description, and, if that succeeds, return 0, otherwise
1087 * return -1 and set errbuf to an error message.
1090 find_or_add_dev(pcap_if_list_t *devlistp, const char *name, bpf_u_int32 flags,
1091 get_if_flags_func get_flags_func, const char *description, char *errbuf)
1096 * Is there already an entry in the list for this device?
1098 curdev = find_dev(devlistp, name);
1099 if (curdev != NULL) {
1107 * No, we didn't find it.
1111 * Try to get additional flags for the device.
1113 if ((*get_flags_func)(name, &flags, errbuf) == -1) {
1121 * Now, try to add it to the list of devices.
1123 return (add_dev(devlistp, name, flags, description, errbuf));
1127 * Look for a given device in the specified list of devices, and return
1128 * the entry for it if we find it or NULL if we don't.
1131 find_dev(pcap_if_list_t *devlistp, const char *name)
1136 * Is there an entry in the list for this device?
1138 for (curdev = devlistp->beginning; curdev != NULL;
1139 curdev = curdev->next) {
1140 if (strcmp(name, curdev->name) == 0) {
1142 * We found it, so, yes, there is. No need to
1143 * add it. Provide the entry we found to our
1157 * Attempt to add an entry for a device, with the specified flags
1158 * and description, and, if that succeeds, return 0 and return a pointer
1159 * to the new entry, otherwise return NULL and set errbuf to an error
1162 * If we weren't given a description, try to get one.
1165 add_dev(pcap_if_list_t *devlistp, const char *name, bpf_u_int32 flags,
1166 const char *description, char *errbuf)
1168 pcap_if_t *curdev, *prevdev, *nextdev;
1169 u_int this_figure_of_merit, nextdev_figure_of_merit;
1171 curdev = malloc(sizeof(pcap_if_t));
1172 if (curdev == NULL) {
1173 pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
1179 * Fill in the entry.
1181 curdev->next = NULL;
1182 curdev->name = strdup(name);
1183 if (curdev->name == NULL) {
1184 pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
1189 if (description == NULL) {
1191 * We weren't handed a description for the interface.
1193 curdev->description = NULL;
1196 * We were handed a description; make a copy.
1198 curdev->description = strdup(description);
1199 if (curdev->description == NULL) {
1200 pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
1207 curdev->addresses = NULL; /* list starts out as empty */
1208 curdev->flags = flags;
1211 * Add it to the list, in the appropriate location.
1212 * First, get the "figure of merit" for this interface.
1214 this_figure_of_merit = get_figure_of_merit(curdev);
1217 * Now look for the last interface with an figure of merit
1218 * less than or equal to the new interface's figure of merit.
1220 * We start with "prevdev" being NULL, meaning we're before
1221 * the first element in the list.
1226 * Get the interface after this one.
1228 if (prevdev == NULL) {
1230 * The next element is the first element.
1232 nextdev = devlistp->beginning;
1234 nextdev = prevdev->next;
1237 * Are we at the end of the list?
1239 if (nextdev == NULL) {
1241 * Yes - we have to put the new entry after "prevdev".
1247 * Is the new interface's figure of merit less
1248 * than the next interface's figure of merit,
1249 * meaning that the new interface is better
1250 * than the next interface?
1252 nextdev_figure_of_merit = get_figure_of_merit(nextdev);
1253 if (this_figure_of_merit < nextdev_figure_of_merit) {
1255 * Yes - we should put the new entry
1256 * before "nextdev", i.e. after "prevdev".
1265 * Insert before "nextdev".
1267 curdev->next = nextdev;
1270 * Insert after "prevdev" - unless "prevdev" is null,
1271 * in which case this is the first interface.
1273 if (prevdev == NULL) {
1275 * This is the first interface. Make it
1276 * the first element in the list of devices.
1278 devlistp->beginning = curdev;
1280 prevdev->next = curdev;
1285 * Free a list of interfaces.
1288 pcap_freealldevs(pcap_if_t *alldevs)
1290 pcap_if_t *curdev, *nextdev;
1291 pcap_addr_t *curaddr, *nextaddr;
1293 for (curdev = alldevs; curdev != NULL; curdev = nextdev) {
1294 nextdev = curdev->next;
1297 * Free all addresses.
1299 for (curaddr = curdev->addresses; curaddr != NULL; curaddr = nextaddr) {
1300 nextaddr = curaddr->next;
1302 free(curaddr->addr);
1303 if (curaddr->netmask)
1304 free(curaddr->netmask);
1305 if (curaddr->broadaddr)
1306 free(curaddr->broadaddr);
1307 if (curaddr->dstaddr)
1308 free(curaddr->dstaddr);
1313 * Free the name string.
1318 * Free the description string, if any.
1320 if (curdev->description != NULL)
1321 free(curdev->description);
1324 * Free the interface.
1331 * pcap-npf.c has its own pcap_lookupdev(), for compatibility reasons, as
1332 * it actually returns the names of all interfaces, with a NUL separator
1333 * between them; some callers may depend on that.
1335 * MS-DOS has its own pcap_lookupdev(), but that might be useful only
1336 * as an optimization.
1338 * In all other cases, we just use pcap_findalldevs() to get a list of
1339 * devices, and pick from that list.
1341 #if !defined(HAVE_PACKET32) && !defined(MSDOS)
1343 * Return the name of a network interface attached to the system, or NULL
1344 * if none can be found. The interface must be configured up; the
1345 * lowest unit number is preferred; loopback is ignored.
1348 pcap_lookupdev(char *errbuf)
1353 * Windows - use the same size as the old WinPcap 3.1 code.
1354 * XXX - this is probably bigger than it needs to be.
1356 #define IF_NAMESIZE 8192
1359 * UN*X - use the system's interface name size.
1360 * XXX - that might not be large enough for capture devices
1361 * that aren't regular network interfaces.
1363 /* for old BSD systems, including bsdi3 */
1365 #define IF_NAMESIZE IFNAMSIZ
1368 static char device[IF_NAMESIZE + 1];
1371 if (pcap_findalldevs(&alldevs, errbuf) == -1)
1374 if (alldevs == NULL || (alldevs->flags & PCAP_IF_LOOPBACK)) {
1376 * There are no devices on the list, or the first device
1377 * on the list is a loopback device, which means there
1378 * are no non-loopback devices on the list. This means
1379 * we can't return any device.
1381 * XXX - why not return a loopback device? If we can't
1382 * capture on it, it won't be on the list, and if it's
1383 * on the list, there aren't any non-loopback devices,
1384 * so why not just supply it as the default device?
1386 (void)pcap_strlcpy(errbuf, "no suitable device found",
1391 * Return the name of the first device on the list.
1393 (void)pcap_strlcpy(device, alldevs->name, sizeof(device));
1397 pcap_freealldevs(alldevs);
1400 #endif /* !defined(HAVE_PACKET32) && !defined(MSDOS) */
1402 #if !defined(_WIN32) && !defined(MSDOS)
1404 * We don't just fetch the entire list of devices, search for the
1405 * particular device, and use its first IPv4 address, as that's too
1406 * much work to get just one device's netmask.
1408 * If we had an API to get attributes for a given device, we could
1412 pcap_lookupnet(const char *device, bpf_u_int32 *netp, bpf_u_int32 *maskp,
1416 register struct sockaddr_in *sin4;
1420 * The pseudo-device "any" listens on all interfaces and therefore
1421 * has the network address and -mask "0.0.0.0" therefore catching
1422 * all traffic. Using NULL for the interface is the same as "any".
1424 if (!device || strcmp(device, "any") == 0
1426 || strstr(device, "dag") != NULL
1428 #ifdef HAVE_SEPTEL_API
1429 || strstr(device, "septel") != NULL
1431 #ifdef PCAP_SUPPORT_BT
1432 || strstr(device, "bluetooth") != NULL
1434 #ifdef PCAP_SUPPORT_USB
1435 || strstr(device, "usbmon") != NULL
1438 || strstr(device, "snf") != NULL
1440 #ifdef PCAP_SUPPORT_NETMAP
1441 || strncmp(device, "netmap:", 7) == 0
1442 || strncmp(device, "vale", 4) == 0
1449 fd = socket(AF_INET, SOCK_DGRAM, 0);
1451 pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
1455 memset(&ifr, 0, sizeof(ifr));
1457 /* XXX Work around Linux kernel bug */
1458 ifr.ifr_addr.sa_family = AF_INET;
1460 (void)pcap_strlcpy(ifr.ifr_name, device, sizeof(ifr.ifr_name));
1461 if (ioctl(fd, SIOCGIFADDR, (char *)&ifr) < 0) {
1462 if (errno == EADDRNOTAVAIL) {
1463 (void)pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE,
1464 "%s: no IPv4 address assigned", device);
1466 pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
1467 errno, "SIOCGIFADDR: %s", device);
1472 sin4 = (struct sockaddr_in *)&ifr.ifr_addr;
1473 *netp = sin4->sin_addr.s_addr;
1474 memset(&ifr, 0, sizeof(ifr));
1476 /* XXX Work around Linux kernel bug */
1477 ifr.ifr_addr.sa_family = AF_INET;
1479 (void)pcap_strlcpy(ifr.ifr_name, device, sizeof(ifr.ifr_name));
1480 if (ioctl(fd, SIOCGIFNETMASK, (char *)&ifr) < 0) {
1481 pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
1482 errno, "SIOCGIFNETMASK: %s", device);
1487 *maskp = sin4->sin_addr.s_addr;
1489 if (IN_CLASSA(*netp))
1490 *maskp = IN_CLASSA_NET;
1491 else if (IN_CLASSB(*netp))
1492 *maskp = IN_CLASSB_NET;
1493 else if (IN_CLASSC(*netp))
1494 *maskp = IN_CLASSC_NET;
1496 (void)pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE,
1497 "inet class for 0x%x unknown", *netp);
1504 #endif /* !defined(_WIN32) && !defined(MSDOS) */
1506 #ifdef ENABLE_REMOTE
1507 #include "pcap-rpcap.h"
1510 * Extract a substring from a string.
1513 get_substring(const char *p, size_t len, char *ebuf)
1517 token = malloc(len + 1);
1518 if (token == NULL) {
1519 pcap_fmt_errmsg_for_errno(ebuf, PCAP_ERRBUF_SIZE,
1523 memcpy(token, p, len);
1529 * Parse a capture source that might be a URL.
1531 * If the source is not a URL, *schemep, *userinfop, *hostp, and *portp
1532 * are set to NULL, *pathp is set to point to the source, and 0 is
1535 * If source is a URL, and the URL refers to a local device (a special
1536 * case of rpcap:), *schemep, *userinfop, *hostp, and *portp are set
1537 * to NULL, *pathp is set to point to the device name, and 0 is returned.
1539 * If source is a URL, and it's not a special case that refers to a local
1540 * device, and the parse succeeds:
1542 * *schemep is set to point to an allocated string containing the scheme;
1544 * if user information is present in the URL, *userinfop is set to point
1545 * to an allocated string containing the user information, otherwise
1548 * if host information is present in the URL, *hostp is set to point
1549 * to an allocated string containing the host information, otherwise
1552 * if a port number is present in the URL, *portp is set to point
1553 * to an allocated string containing the port number, otherwise
1556 * *pathp is set to point to an allocated string containing the
1559 * and 0 is returned.
1561 * If the parse fails, ebuf is set to an error string, and -1 is returned.
1564 pcap_parse_source(const char *source, char **schemep, char **userinfop,
1565 char **hostp, char **portp, char **pathp, char *ebuf)
1571 size_t authority_len;
1573 char *parsep, *atsignp, *bracketp;
1574 char *userinfo, *host, *port, *path;
1577 * Start out returning nothing.
1588 * URI = scheme ":" hier-part [ "?" query ] [ "#" fragment ]
1590 * hier-part = "//" authority path-abempty
1595 * authority = [ userinfo "@" ] host [ ":" port ]
1597 * userinfo = *( unreserved / pct-encoded / sub-delims / ":" )
1599 * Step 1: look for the ":" at the end of the scheme.
1600 * A colon in the source is *NOT* sufficient to indicate that
1601 * this is a URL, as interface names on some platforms might
1602 * include colons (e.g., I think some Solaris interfaces
1605 colonp = strchr(source, ':');
1606 if (colonp == NULL) {
1608 * The source is the device to open.
1609 * Return a NULL pointer for the scheme, user information,
1610 * host, and port, and return the device as the path.
1612 *pathp = strdup(source);
1613 if (*pathp == NULL) {
1614 pcap_fmt_errmsg_for_errno(ebuf, PCAP_ERRBUF_SIZE,
1622 * All schemes must have "//" after them, i.e. we only support
1623 * hier-part = "//" authority path-abempty, not
1624 * hier-part = path-absolute
1625 * hier-part = path-rootless
1626 * hier-part = path-empty
1628 * We need that in order to distinguish between a local device
1629 * name that happens to contain a colon and a URI.
1631 if (strncmp(colonp + 1, "//", 2) != 0) {
1633 * The source is the device to open.
1634 * Return a NULL pointer for the scheme, user information,
1635 * host, and port, and return the device as the path.
1637 *pathp = strdup(source);
1638 if (*pathp == NULL) {
1639 pcap_fmt_errmsg_for_errno(ebuf, PCAP_ERRBUF_SIZE,
1647 * XXX - check whether the purported scheme could be a scheme?
1651 * OK, this looks like a URL.
1654 scheme_len = colonp - source;
1655 scheme = malloc(scheme_len + 1);
1656 if (scheme == NULL) {
1657 pcap_fmt_errmsg_for_errno(ebuf, PCAP_ERRBUF_SIZE,
1661 memcpy(scheme, source, scheme_len);
1662 scheme[scheme_len] = '\0';
1665 * Treat file: specially - take everything after file:// as
1668 if (pcap_strcasecmp(scheme, "file") == 0) {
1669 *pathp = strdup(colonp + 3);
1670 if (*pathp == NULL) {
1671 pcap_fmt_errmsg_for_errno(ebuf, PCAP_ERRBUF_SIZE,
1681 * The WinPcap documentation says you can specify a local
1682 * interface with "rpcap://{device}"; we special-case
1683 * that here. If the scheme is "rpcap", and there are
1684 * no slashes past the "//", we just return the device.
1688 if (pcap_strcasecmp(scheme, "rpcap") == 0 &&
1689 strchr(colonp + 3, '/') == NULL) {
1693 * Return a NULL pointer for the scheme, user information,
1694 * host, and port, and return the device as the path.
1697 *pathp = strdup(colonp + 3);
1698 if (*pathp == NULL) {
1699 pcap_fmt_errmsg_for_errno(ebuf, PCAP_ERRBUF_SIZE,
1707 * OK, now start parsing the authority.
1708 * Get token, terminated with / or terminated at the end of
1711 authority_len = strcspn(colonp + 3, "/");
1712 authority = get_substring(colonp + 3, authority_len, ebuf);
1713 if (authority == NULL) {
1720 endp = colonp + 3 + authority_len;
1723 * Now carve the authority field into its components.
1728 * Is there a userinfo field?
1730 atsignp = strchr(parsep, '@');
1731 if (atsignp != NULL) {
1735 size_t userinfo_len;
1737 userinfo_len = atsignp - parsep;
1738 userinfo = get_substring(parsep, userinfo_len, ebuf);
1739 if (userinfo == NULL) {
1747 parsep = atsignp + 1;
1756 * Is there a host field?
1758 if (*parsep == '\0') {
1760 * No; there's no host field or port field.
1771 * Is it an IP-literal?
1773 if (*parsep == '[') {
1776 * Treat verything up to the closing square
1777 * bracket as the IP-Literal; we don't worry
1778 * about whether it's a valid IPv6address or
1779 * IPvFuture (or an IPv4address, for that
1780 * matter, just in case we get handed a
1781 * URL with an IPv4 IP-Literal, of the sort
1782 * that pcap_createsrcstr() used to generate,
1783 * and that pcap_parsesrcstr(), in the original
1784 * WinPcap code, accepted).
1786 bracketp = strchr(parsep, ']');
1787 if (bracketp == NULL) {
1789 * There's no closing square bracket.
1791 pcap_snprintf(ebuf, PCAP_ERRBUF_SIZE,
1792 "IP-literal in URL doesn't end with ]");
1798 if (*(bracketp + 1) != '\0' &&
1799 *(bracketp + 1) != ':') {
1801 * There's extra crud after the
1802 * closing square bracketn.
1804 pcap_snprintf(ebuf, PCAP_ERRBUF_SIZE,
1805 "Extra text after IP-literal in URL");
1811 host_len = (bracketp - 1) - parsep;
1812 host = get_substring(parsep + 1, host_len, ebuf);
1822 parsep = bracketp + 1;
1826 * Treat everything up to a : or the end of
1827 * the string as the host.
1829 host_len = strcspn(parsep, ":");
1830 host = get_substring(parsep, host_len, ebuf);
1840 parsep = parsep + host_len;
1844 * Is there a port field?
1846 if (*parsep == ':') {
1848 * Yes. It's the rest of the authority field.
1853 port_len = strlen(parsep);
1854 port = get_substring(parsep, port_len, ebuf);
1875 * Everything else is the path. Strip off the leading /.
1880 path = strdup(endp + 1);
1882 pcap_fmt_errmsg_for_errno(ebuf, PCAP_ERRBUF_SIZE,
1891 *userinfop = userinfo;
1899 pcap_createsrcstr(char *source, int type, const char *host, const char *port,
1900 const char *name, char *errbuf)
1905 pcap_strlcpy(source, PCAP_SRC_FILE_STRING, PCAP_BUF_SIZE);
1906 if (name != NULL && *name != '\0') {
1907 pcap_strlcat(source, name, PCAP_BUF_SIZE);
1910 pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE,
1911 "The file name cannot be NULL.");
1915 case PCAP_SRC_IFREMOTE:
1916 pcap_strlcpy(source, PCAP_SRC_IF_STRING, PCAP_BUF_SIZE);
1917 if (host != NULL && *host != '\0') {
1918 if (strchr(host, ':') != NULL) {
1920 * The host name contains a colon, so it's
1921 * probably an IPv6 address, and needs to
1922 * be included in square brackets.
1924 pcap_strlcat(source, "[", PCAP_BUF_SIZE);
1925 pcap_strlcat(source, host, PCAP_BUF_SIZE);
1926 pcap_strlcat(source, "]", PCAP_BUF_SIZE);
1928 pcap_strlcat(source, host, PCAP_BUF_SIZE);
1930 if (port != NULL && *port != '\0') {
1931 pcap_strlcat(source, ":", PCAP_BUF_SIZE);
1932 pcap_strlcat(source, port, PCAP_BUF_SIZE);
1935 pcap_strlcat(source, "/", PCAP_BUF_SIZE);
1937 pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE,
1938 "The host name cannot be NULL.");
1942 if (name != NULL && *name != '\0')
1943 pcap_strlcat(source, name, PCAP_BUF_SIZE);
1947 case PCAP_SRC_IFLOCAL:
1948 pcap_strlcpy(source, PCAP_SRC_IF_STRING, PCAP_BUF_SIZE);
1950 if (name != NULL && *name != '\0')
1951 pcap_strlcat(source, name, PCAP_BUF_SIZE);
1956 pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE,
1957 "The interface type is not valid.");
1963 pcap_parsesrcstr(const char *source, int *type, char *host, char *port,
1964 char *name, char *errbuf)
1966 char *scheme, *tmpuserinfo, *tmphost, *tmpport, *tmppath;
1968 /* Initialization stuff */
1976 /* Parse the source string */
1977 if (pcap_parse_source(source, &scheme, &tmpuserinfo, &tmphost,
1978 &tmpport, &tmppath, errbuf) == -1) {
1985 if (scheme == NULL) {
1989 if (name && tmppath)
1990 pcap_strlcpy(name, tmppath, PCAP_BUF_SIZE);
1992 *type = PCAP_SRC_IFLOCAL;
2000 if (strcmp(scheme, "rpcap") == 0) {
2004 * pcap_parse_source() has already handled the case of
2007 if (host && tmphost) {
2009 pcap_snprintf(host, PCAP_BUF_SIZE, "%s@%s",
2010 tmpuserinfo, tmphost);
2012 pcap_strlcpy(host, tmphost, PCAP_BUF_SIZE);
2014 if (port && tmpport)
2015 pcap_strlcpy(port, tmpport, PCAP_BUF_SIZE);
2016 if (name && tmppath)
2017 pcap_strlcpy(name, tmppath, PCAP_BUF_SIZE);
2019 *type = PCAP_SRC_IFREMOTE;
2028 if (strcmp(scheme, "file") == 0) {
2032 if (name && tmppath)
2033 pcap_strlcpy(name, tmppath, PCAP_BUF_SIZE);
2035 *type = PCAP_SRC_FILE;
2045 * Neither rpcap: nor file:; just treat the entire string
2046 * as a local device.
2049 pcap_strlcpy(name, source, PCAP_BUF_SIZE);
2051 *type = PCAP_SRC_IFLOCAL;
2062 pcap_create(const char *device, char *errbuf)
2070 * A null device name is equivalent to the "any" device -
2071 * which might not be supported on this platform, but
2072 * this means that you'll get a "not supported" error
2073 * rather than, say, a crash when we try to dereference
2077 device_str = strdup("any");
2081 * On Windows, for backwards compatibility reasons,
2082 * pcap_lookupdev() returns a pointer to a sequence of
2083 * pairs of UTF-16LE device names and local code page
2084 * description strings.
2086 * This means that if a program uses pcap_lookupdev()
2087 * to get a default device, and hands that to an API
2088 * that opens devices, we'll get handed a UTF-16LE
2089 * string, not a string in the local code page.
2091 * To work around that, we check whether the string
2092 * looks as if it might be a UTF-16LE strinh and, if
2093 * so, convert it back to the local code page's
2096 * XXX - you *cannot* reliably detect whether a
2097 * string is UTF-16LE or not; "a" could either
2098 * be a one-character ASCII string or the first
2099 * character of a UTF-16LE string. This particular
2100 * version of this heuristic dates back to WinPcap
2101 * 4.1.1; PacketOpenAdapter() does uses the same
2102 * heuristic, with the exact same vulnerability.
2104 if (device[0] != '\0' && device[1] == '\0') {
2107 length = wcslen((wchar_t *)device);
2108 device_str = (char *)malloc(length + 1);
2109 if (device_str == NULL) {
2110 pcap_fmt_errmsg_for_errno(errbuf,
2111 PCAP_ERRBUF_SIZE, errno,
2116 pcap_snprintf(device_str, length + 1, "%ws",
2117 (const wchar_t *)device);
2120 device_str = strdup(device);
2122 if (device_str == NULL) {
2123 pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
2129 * Try each of the non-local-network-interface capture
2130 * source types until we find one that works for this
2131 * device or run out of types.
2133 for (i = 0; capture_source_types[i].create_op != NULL; i++) {
2135 p = capture_source_types[i].create_op(device_str, errbuf,
2139 * The device name refers to a device of the
2140 * type in question; either it succeeded,
2141 * in which case p refers to a pcap_t to
2142 * later activate for the device, or it
2143 * failed, in which case p is null and we
2144 * should return that to report the failure
2149 * We assume the caller filled in errbuf.
2154 p->opt.device = device_str;
2160 * OK, try it as a regular network interface.
2162 p = pcap_create_interface(device_str, errbuf);
2165 * We assume the caller filled in errbuf.
2170 p->opt.device = device_str;
2175 * Set nonblocking mode on an unactivated pcap_t; this sets a flag
2176 * checked by pcap_activate(), which sets the mode after calling
2177 * the activate routine.
2180 pcap_setnonblock_unactivated(pcap_t *p, int nonblock)
2182 p->opt.nonblock = nonblock;
2187 initialize_ops(pcap_t *p)
2190 * Set operation pointers for operations that only work on
2191 * an activated pcap_t to point to a routine that returns
2192 * a "this isn't activated" error.
2194 p->read_op = pcap_read_not_initialized;
2195 p->inject_op = pcap_inject_not_initialized;
2196 p->setfilter_op = pcap_setfilter_not_initialized;
2197 p->setdirection_op = pcap_setdirection_not_initialized;
2198 p->set_datalink_op = pcap_set_datalink_not_initialized;
2199 p->getnonblock_op = pcap_getnonblock_not_initialized;
2200 p->stats_op = pcap_stats_not_initialized;
2202 p->stats_ex_op = pcap_stats_ex_not_initialized;
2203 p->setbuff_op = pcap_setbuff_not_initialized;
2204 p->setmode_op = pcap_setmode_not_initialized;
2205 p->setmintocopy_op = pcap_setmintocopy_not_initialized;
2206 p->getevent_op = pcap_getevent_not_initialized;
2207 p->oid_get_request_op = pcap_oid_get_request_not_initialized;
2208 p->oid_set_request_op = pcap_oid_set_request_not_initialized;
2209 p->sendqueue_transmit_op = pcap_sendqueue_transmit_not_initialized;
2210 p->setuserbuffer_op = pcap_setuserbuffer_not_initialized;
2211 p->live_dump_op = pcap_live_dump_not_initialized;
2212 p->live_dump_ended_op = pcap_live_dump_ended_not_initialized;
2213 p->get_airpcap_handle_op = pcap_get_airpcap_handle_not_initialized;
2217 * Default cleanup operation - implementations can override
2218 * this, but should call pcap_cleanup_live_common() after
2219 * doing their own additional cleanup.
2221 p->cleanup_op = pcap_cleanup_live_common;
2224 * In most cases, the standard one-shot callback can
2225 * be used for pcap_next()/pcap_next_ex().
2227 p->oneshot_callback = pcap_oneshot;
2231 pcap_alloc_pcap_t(char *ebuf, size_t size)
2237 * Allocate a chunk of memory big enough for a pcap_t
2238 * plus a structure following it of size "size". The
2239 * structure following it is a private data structure
2240 * for the routines that handle this pcap_t.
2242 * The structure following it must be aligned on
2243 * the appropriate alignment boundary for this platform.
2244 * We align on an 8-byte boundary as that's probably what
2245 * at least some platforms do, even with 32-bit integers,
2246 * and because we can't be sure that some values won't
2247 * require 8-byte alignment even on platforms with 32-bit
2250 #define PCAP_T_ALIGNED_SIZE ((sizeof(pcap_t) + 7U) & ~0x7U)
2251 chunk = malloc(PCAP_T_ALIGNED_SIZE + size);
2252 if (chunk == NULL) {
2253 pcap_fmt_errmsg_for_errno(ebuf, PCAP_ERRBUF_SIZE,
2257 memset(chunk, 0, PCAP_T_ALIGNED_SIZE + size);
2260 * Get a pointer to the pcap_t at the beginning.
2262 p = (pcap_t *)chunk;
2265 p->handle = INVALID_HANDLE_VALUE; /* not opened yet */
2267 p->fd = -1; /* not opened yet */
2269 p->selectable_fd = -1;
2270 p->required_select_timeout = NULL;
2275 /* No private data was requested. */
2279 * Set the pointer to the private data; that's the structure
2280 * of size "size" following the pcap_t.
2282 p->priv = (void *)(chunk + PCAP_T_ALIGNED_SIZE);
2289 pcap_create_common(char *ebuf, size_t size)
2293 p = pcap_alloc_pcap_t(ebuf, size);
2298 * Default to "can't set rfmon mode"; if it's supported by
2299 * a platform, the create routine that called us can set
2300 * the op to its routine to check whether a particular
2301 * device supports it.
2303 p->can_set_rfmon_op = pcap_cant_set_rfmon;
2306 * If pcap_setnonblock() is called on a not-yet-activated
2307 * pcap_t, default to setting a flag and turning
2308 * on non-blocking mode when activated.
2310 p->setnonblock_op = pcap_setnonblock_unactivated;
2314 /* put in some defaults*/
2315 p->snapshot = 0; /* max packet size unspecified */
2316 p->opt.timeout = 0; /* no timeout specified */
2317 p->opt.buffer_size = 0; /* use the platform's default */
2320 p->opt.immediate = 0;
2321 p->opt.tstamp_type = -1; /* default to not setting time stamp type */
2322 p->opt.tstamp_precision = PCAP_TSTAMP_PRECISION_MICRO;
2324 * Platform-dependent options.
2327 p->opt.protocol = 0;
2330 p->opt.nocapture_local = 0;
2334 * Start out with no BPF code generation flags set.
2336 p->bpf_codegen_flags = 0;
2342 pcap_check_activated(pcap_t *p)
2345 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "can't perform "
2346 " operation on activated capture");
2353 pcap_set_snaplen(pcap_t *p, int snaplen)
2355 if (pcap_check_activated(p))
2356 return (PCAP_ERROR_ACTIVATED);
2357 p->snapshot = snaplen;
2362 pcap_set_promisc(pcap_t *p, int promisc)
2364 if (pcap_check_activated(p))
2365 return (PCAP_ERROR_ACTIVATED);
2366 p->opt.promisc = promisc;
2371 pcap_set_rfmon(pcap_t *p, int rfmon)
2373 if (pcap_check_activated(p))
2374 return (PCAP_ERROR_ACTIVATED);
2375 p->opt.rfmon = rfmon;
2380 pcap_set_timeout(pcap_t *p, int timeout_ms)
2382 if (pcap_check_activated(p))
2383 return (PCAP_ERROR_ACTIVATED);
2384 p->opt.timeout = timeout_ms;
2389 pcap_set_tstamp_type(pcap_t *p, int tstamp_type)
2393 if (pcap_check_activated(p))
2394 return (PCAP_ERROR_ACTIVATED);
2397 * The argument should have been u_int, but that's too late
2398 * to change now - it's an API.
2400 if (tstamp_type < 0)
2401 return (PCAP_WARNING_TSTAMP_TYPE_NOTSUP);
2404 * If p->tstamp_type_count is 0, we only support PCAP_TSTAMP_HOST;
2405 * the default time stamp type is PCAP_TSTAMP_HOST.
2407 if (p->tstamp_type_count == 0) {
2408 if (tstamp_type == PCAP_TSTAMP_HOST) {
2409 p->opt.tstamp_type = tstamp_type;
2414 * Check whether we claim to support this type of time stamp.
2416 for (i = 0; i < p->tstamp_type_count; i++) {
2417 if (p->tstamp_type_list[i] == (u_int)tstamp_type) {
2421 p->opt.tstamp_type = tstamp_type;
2428 * We don't support this type of time stamp.
2430 return (PCAP_WARNING_TSTAMP_TYPE_NOTSUP);
2434 pcap_set_immediate_mode(pcap_t *p, int immediate)
2436 if (pcap_check_activated(p))
2437 return (PCAP_ERROR_ACTIVATED);
2438 p->opt.immediate = immediate;
2443 pcap_set_buffer_size(pcap_t *p, int buffer_size)
2445 if (pcap_check_activated(p))
2446 return (PCAP_ERROR_ACTIVATED);
2447 if (buffer_size <= 0) {
2449 * Silently ignore invalid values.
2453 p->opt.buffer_size = buffer_size;
2458 pcap_set_tstamp_precision(pcap_t *p, int tstamp_precision)
2462 if (pcap_check_activated(p))
2463 return (PCAP_ERROR_ACTIVATED);
2466 * The argument should have been u_int, but that's too late
2467 * to change now - it's an API.
2469 if (tstamp_precision < 0)
2470 return (PCAP_ERROR_TSTAMP_PRECISION_NOTSUP);
2473 * If p->tstamp_precision_count is 0, we only support setting
2474 * the time stamp precision to microsecond precision; every
2475 * pcap module *MUST* support microsecond precision, even if
2476 * it does so by converting the native precision to
2479 if (p->tstamp_precision_count == 0) {
2480 if (tstamp_precision == PCAP_TSTAMP_PRECISION_MICRO) {
2481 p->opt.tstamp_precision = tstamp_precision;
2486 * Check whether we claim to support this precision of
2489 for (i = 0; i < p->tstamp_precision_count; i++) {
2490 if (p->tstamp_precision_list[i] == (u_int)tstamp_precision) {
2494 p->opt.tstamp_precision = tstamp_precision;
2501 * We don't support this time stamp precision.
2503 return (PCAP_ERROR_TSTAMP_PRECISION_NOTSUP);
2507 pcap_get_tstamp_precision(pcap_t *p)
2509 return (p->opt.tstamp_precision);
2513 pcap_activate(pcap_t *p)
2518 * Catch attempts to re-activate an already-activated
2519 * pcap_t; this should, for example, catch code that
2520 * calls pcap_open_live() followed by pcap_activate(),
2521 * as some code that showed up in a Stack Exchange
2524 if (pcap_check_activated(p))
2525 return (PCAP_ERROR_ACTIVATED);
2526 status = p->activate_op(p);
2529 * If somebody requested non-blocking mode before
2530 * calling pcap_activate(), turn it on now.
2532 if (p->opt.nonblock) {
2533 status = p->setnonblock_op(p, 1);
2536 * Failed. Undo everything done by
2537 * the activate operation.
2546 if (p->errbuf[0] == '\0') {
2548 * No error message supplied by the activate routine;
2549 * for the benefit of programs that don't specially
2550 * handle errors other than PCAP_ERROR, return the
2551 * error message corresponding to the status.
2553 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "%s",
2554 pcap_statustostr(status));
2558 * Undo any operation pointer setting, etc. done by
2559 * the activate operation.
2567 pcap_open_live(const char *device, int snaplen, int promisc, int to_ms, char *errbuf)
2571 #ifdef ENABLE_REMOTE
2572 char host[PCAP_BUF_SIZE + 1];
2573 char port[PCAP_BUF_SIZE + 1];
2574 char name[PCAP_BUF_SIZE + 1];
2578 * A null device name is equivalent to the "any" device -
2579 * which might not be supported on this platform, but
2580 * this means that you'll get a "not supported" error
2581 * rather than, say, a crash when we try to dereference
2588 * Retrofit - we have to make older applications compatible with
2590 * So we're calling pcap_open_remote() from here; this is a very
2592 * Obviously, we cannot exploit all the new features; for instance,
2593 * we cannot send authentication, we cannot use a UDP data connection,
2596 if (pcap_parsesrcstr(device, &srctype, host, port, name, errbuf))
2599 if (srctype == PCAP_SRC_IFREMOTE) {
2601 * Although we already have host, port and iface, we prefer
2602 * to pass only 'device' to pcap_open_rpcap(), so that it has
2603 * to call pcap_parsesrcstr() again.
2604 * This is less optimized, but much clearer.
2606 return (pcap_open_rpcap(device, snaplen,
2607 promisc ? PCAP_OPENFLAG_PROMISCUOUS : 0, to_ms,
2610 if (srctype == PCAP_SRC_FILE) {
2611 pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE, "unknown URL scheme \"file\"");
2614 if (srctype == PCAP_SRC_IFLOCAL) {
2616 * If it starts with rpcap://, that refers to a local device
2617 * (no host part in the URL). Remove the rpcap://, and
2618 * fall through to the regular open path.
2620 if (strncmp(device, PCAP_SRC_IF_STRING, strlen(PCAP_SRC_IF_STRING)) == 0) {
2621 size_t len = strlen(device) - strlen(PCAP_SRC_IF_STRING) + 1;
2624 device += strlen(PCAP_SRC_IF_STRING);
2627 #endif /* ENABLE_REMOTE */
2629 p = pcap_create(device, errbuf);
2632 status = pcap_set_snaplen(p, snaplen);
2635 status = pcap_set_promisc(p, promisc);
2638 status = pcap_set_timeout(p, to_ms);
2642 * Mark this as opened with pcap_open_live(), so that, for
2643 * example, we show the full list of DLT_ values, rather
2644 * than just the ones that are compatible with capturing
2645 * when not in monitor mode. That allows existing applications
2646 * to work the way they used to work, but allows new applications
2647 * that know about the new open API to, for example, find out the
2648 * DLT_ values that they can select without changing whether
2649 * the adapter is in monitor mode or not.
2652 status = pcap_activate(p);
2657 if (status == PCAP_ERROR)
2658 pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE, "%s: %.*s", device,
2659 PCAP_ERRBUF_SIZE - 3, p->errbuf);
2660 else if (status == PCAP_ERROR_NO_SUCH_DEVICE ||
2661 status == PCAP_ERROR_PERM_DENIED ||
2662 status == PCAP_ERROR_PROMISC_PERM_DENIED)
2663 pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE, "%s: %s (%.*s)", device,
2664 pcap_statustostr(status), PCAP_ERRBUF_SIZE - 6, p->errbuf);
2666 pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE, "%s: %s", device,
2667 pcap_statustostr(status));
2673 pcap_open_offline_common(char *ebuf, size_t size)
2677 p = pcap_alloc_pcap_t(ebuf, size);
2681 p->opt.tstamp_precision = PCAP_TSTAMP_PRECISION_MICRO;
2687 pcap_dispatch(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
2689 return (p->read_op(p, cnt, callback, user));
2693 pcap_loop(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
2698 if (p->rfile != NULL) {
2700 * 0 means EOF, so don't loop if we get 0.
2702 n = pcap_offline_read(p, cnt, callback, user);
2705 * XXX keep reading until we get something
2706 * (or an error occurs)
2709 n = p->read_op(p, cnt, callback, user);
2714 if (!PACKET_COUNT_IS_UNLIMITED(cnt)) {
2723 * Force the loop in "pcap_read()" or "pcap_read_offline()" to terminate.
2726 pcap_breakloop(pcap_t *p)
2732 pcap_datalink(pcap_t *p)
2735 return (PCAP_ERROR_NOT_ACTIVATED);
2736 return (p->linktype);
2740 pcap_datalink_ext(pcap_t *p)
2743 return (PCAP_ERROR_NOT_ACTIVATED);
2744 return (p->linktype_ext);
2748 pcap_list_datalinks(pcap_t *p, int **dlt_buffer)
2751 return (PCAP_ERROR_NOT_ACTIVATED);
2752 if (p->dlt_count == 0) {
2754 * We couldn't fetch the list of DLTs, which means
2755 * this platform doesn't support changing the
2756 * DLT for an interface. Return a list of DLTs
2757 * containing only the DLT this device supports.
2759 *dlt_buffer = (int*)malloc(sizeof(**dlt_buffer));
2760 if (*dlt_buffer == NULL) {
2761 pcap_fmt_errmsg_for_errno(p->errbuf, sizeof(p->errbuf),
2763 return (PCAP_ERROR);
2765 **dlt_buffer = p->linktype;
2768 *dlt_buffer = (int*)calloc(sizeof(**dlt_buffer), p->dlt_count);
2769 if (*dlt_buffer == NULL) {
2770 pcap_fmt_errmsg_for_errno(p->errbuf, sizeof(p->errbuf),
2772 return (PCAP_ERROR);
2774 (void)memcpy(*dlt_buffer, p->dlt_list,
2775 sizeof(**dlt_buffer) * p->dlt_count);
2776 return (p->dlt_count);
2781 * In Windows, you might have a library built with one version of the
2782 * C runtime library and an application built with another version of
2783 * the C runtime library, which means that the library might use one
2784 * version of malloc() and free() and the application might use another
2785 * version of malloc() and free(). If so, that means something
2786 * allocated by the library cannot be freed by the application, so we
2787 * need to have a pcap_free_datalinks() routine to free up the list
2788 * allocated by pcap_list_datalinks(), even though it's just a wrapper
2792 pcap_free_datalinks(int *dlt_list)
2798 pcap_set_datalink(pcap_t *p, int dlt)
2801 const char *dlt_name;
2806 if (p->dlt_count == 0 || p->set_datalink_op == NULL) {
2808 * We couldn't fetch the list of DLTs, or we don't
2809 * have a "set datalink" operation, which means
2810 * this platform doesn't support changing the
2811 * DLT for an interface. Check whether the new
2812 * DLT is the one this interface supports.
2814 if (p->linktype != dlt)
2818 * It is, so there's nothing we need to do here.
2822 for (i = 0; i < p->dlt_count; i++)
2823 if (p->dlt_list[i] == (u_int)dlt)
2825 if (i >= p->dlt_count)
2827 if (p->dlt_count == 2 && p->dlt_list[0] == DLT_EN10MB &&
2828 dlt == DLT_DOCSIS) {
2830 * This is presumably an Ethernet device, as the first
2831 * link-layer type it offers is DLT_EN10MB, and the only
2832 * other type it offers is DLT_DOCSIS. That means that
2833 * we can't tell the driver to supply DOCSIS link-layer
2834 * headers - we're just pretending that's what we're
2835 * getting, as, presumably, we're capturing on a dedicated
2836 * link to a Cisco Cable Modem Termination System, and
2837 * it's putting raw DOCSIS frames on the wire inside low-level
2843 if (p->set_datalink_op(p, dlt) == -1)
2849 dlt_name = pcap_datalink_val_to_name(dlt);
2850 if (dlt_name != NULL) {
2851 (void) pcap_snprintf(p->errbuf, sizeof(p->errbuf),
2852 "%s is not one of the DLTs supported by this device",
2855 (void) pcap_snprintf(p->errbuf, sizeof(p->errbuf),
2856 "DLT %d is not one of the DLTs supported by this device",
2863 * This array is designed for mapping upper and lower case letter
2864 * together for a case independent comparison. The mappings are
2865 * based upon ascii character sequences.
2867 static const u_char charmap[] = {
2868 (u_char)'\000', (u_char)'\001', (u_char)'\002', (u_char)'\003',
2869 (u_char)'\004', (u_char)'\005', (u_char)'\006', (u_char)'\007',
2870 (u_char)'\010', (u_char)'\011', (u_char)'\012', (u_char)'\013',
2871 (u_char)'\014', (u_char)'\015', (u_char)'\016', (u_char)'\017',
2872 (u_char)'\020', (u_char)'\021', (u_char)'\022', (u_char)'\023',
2873 (u_char)'\024', (u_char)'\025', (u_char)'\026', (u_char)'\027',
2874 (u_char)'\030', (u_char)'\031', (u_char)'\032', (u_char)'\033',
2875 (u_char)'\034', (u_char)'\035', (u_char)'\036', (u_char)'\037',
2876 (u_char)'\040', (u_char)'\041', (u_char)'\042', (u_char)'\043',
2877 (u_char)'\044', (u_char)'\045', (u_char)'\046', (u_char)'\047',
2878 (u_char)'\050', (u_char)'\051', (u_char)'\052', (u_char)'\053',
2879 (u_char)'\054', (u_char)'\055', (u_char)'\056', (u_char)'\057',
2880 (u_char)'\060', (u_char)'\061', (u_char)'\062', (u_char)'\063',
2881 (u_char)'\064', (u_char)'\065', (u_char)'\066', (u_char)'\067',
2882 (u_char)'\070', (u_char)'\071', (u_char)'\072', (u_char)'\073',
2883 (u_char)'\074', (u_char)'\075', (u_char)'\076', (u_char)'\077',
2884 (u_char)'\100', (u_char)'\141', (u_char)'\142', (u_char)'\143',
2885 (u_char)'\144', (u_char)'\145', (u_char)'\146', (u_char)'\147',
2886 (u_char)'\150', (u_char)'\151', (u_char)'\152', (u_char)'\153',
2887 (u_char)'\154', (u_char)'\155', (u_char)'\156', (u_char)'\157',
2888 (u_char)'\160', (u_char)'\161', (u_char)'\162', (u_char)'\163',
2889 (u_char)'\164', (u_char)'\165', (u_char)'\166', (u_char)'\167',
2890 (u_char)'\170', (u_char)'\171', (u_char)'\172', (u_char)'\133',
2891 (u_char)'\134', (u_char)'\135', (u_char)'\136', (u_char)'\137',
2892 (u_char)'\140', (u_char)'\141', (u_char)'\142', (u_char)'\143',
2893 (u_char)'\144', (u_char)'\145', (u_char)'\146', (u_char)'\147',
2894 (u_char)'\150', (u_char)'\151', (u_char)'\152', (u_char)'\153',
2895 (u_char)'\154', (u_char)'\155', (u_char)'\156', (u_char)'\157',
2896 (u_char)'\160', (u_char)'\161', (u_char)'\162', (u_char)'\163',
2897 (u_char)'\164', (u_char)'\165', (u_char)'\166', (u_char)'\167',
2898 (u_char)'\170', (u_char)'\171', (u_char)'\172', (u_char)'\173',
2899 (u_char)'\174', (u_char)'\175', (u_char)'\176', (u_char)'\177',
2900 (u_char)'\200', (u_char)'\201', (u_char)'\202', (u_char)'\203',
2901 (u_char)'\204', (u_char)'\205', (u_char)'\206', (u_char)'\207',
2902 (u_char)'\210', (u_char)'\211', (u_char)'\212', (u_char)'\213',
2903 (u_char)'\214', (u_char)'\215', (u_char)'\216', (u_char)'\217',
2904 (u_char)'\220', (u_char)'\221', (u_char)'\222', (u_char)'\223',
2905 (u_char)'\224', (u_char)'\225', (u_char)'\226', (u_char)'\227',
2906 (u_char)'\230', (u_char)'\231', (u_char)'\232', (u_char)'\233',
2907 (u_char)'\234', (u_char)'\235', (u_char)'\236', (u_char)'\237',
2908 (u_char)'\240', (u_char)'\241', (u_char)'\242', (u_char)'\243',
2909 (u_char)'\244', (u_char)'\245', (u_char)'\246', (u_char)'\247',
2910 (u_char)'\250', (u_char)'\251', (u_char)'\252', (u_char)'\253',
2911 (u_char)'\254', (u_char)'\255', (u_char)'\256', (u_char)'\257',
2912 (u_char)'\260', (u_char)'\261', (u_char)'\262', (u_char)'\263',
2913 (u_char)'\264', (u_char)'\265', (u_char)'\266', (u_char)'\267',
2914 (u_char)'\270', (u_char)'\271', (u_char)'\272', (u_char)'\273',
2915 (u_char)'\274', (u_char)'\275', (u_char)'\276', (u_char)'\277',
2916 (u_char)'\300', (u_char)'\341', (u_char)'\342', (u_char)'\343',
2917 (u_char)'\344', (u_char)'\345', (u_char)'\346', (u_char)'\347',
2918 (u_char)'\350', (u_char)'\351', (u_char)'\352', (u_char)'\353',
2919 (u_char)'\354', (u_char)'\355', (u_char)'\356', (u_char)'\357',
2920 (u_char)'\360', (u_char)'\361', (u_char)'\362', (u_char)'\363',
2921 (u_char)'\364', (u_char)'\365', (u_char)'\366', (u_char)'\367',
2922 (u_char)'\370', (u_char)'\371', (u_char)'\372', (u_char)'\333',
2923 (u_char)'\334', (u_char)'\335', (u_char)'\336', (u_char)'\337',
2924 (u_char)'\340', (u_char)'\341', (u_char)'\342', (u_char)'\343',
2925 (u_char)'\344', (u_char)'\345', (u_char)'\346', (u_char)'\347',
2926 (u_char)'\350', (u_char)'\351', (u_char)'\352', (u_char)'\353',
2927 (u_char)'\354', (u_char)'\355', (u_char)'\356', (u_char)'\357',
2928 (u_char)'\360', (u_char)'\361', (u_char)'\362', (u_char)'\363',
2929 (u_char)'\364', (u_char)'\365', (u_char)'\366', (u_char)'\367',
2930 (u_char)'\370', (u_char)'\371', (u_char)'\372', (u_char)'\373',
2931 (u_char)'\374', (u_char)'\375', (u_char)'\376', (u_char)'\377',
2935 pcap_strcasecmp(const char *s1, const char *s2)
2937 register const u_char *cm = charmap,
2938 *us1 = (const u_char *)s1,
2939 *us2 = (const u_char *)s2;
2941 while (cm[*us1] == cm[*us2++])
2944 return (cm[*us1] - cm[*--us2]);
2949 const char *description;
2953 #define DLT_CHOICE(code, description) { #code, description, DLT_ ## code }
2954 #define DLT_CHOICE_SENTINEL { NULL, NULL, 0 }
2956 static struct dlt_choice dlt_choices[] = {
2957 DLT_CHOICE(NULL, "BSD loopback"),
2958 DLT_CHOICE(EN10MB, "Ethernet"),
2959 DLT_CHOICE(IEEE802, "Token ring"),
2960 DLT_CHOICE(ARCNET, "BSD ARCNET"),
2961 DLT_CHOICE(SLIP, "SLIP"),
2962 DLT_CHOICE(PPP, "PPP"),
2963 DLT_CHOICE(FDDI, "FDDI"),
2964 DLT_CHOICE(ATM_RFC1483, "RFC 1483 LLC-encapsulated ATM"),
2965 DLT_CHOICE(RAW, "Raw IP"),
2966 DLT_CHOICE(SLIP_BSDOS, "BSD/OS SLIP"),
2967 DLT_CHOICE(PPP_BSDOS, "BSD/OS PPP"),
2968 DLT_CHOICE(ATM_CLIP, "Linux Classical IP-over-ATM"),
2969 DLT_CHOICE(PPP_SERIAL, "PPP over serial"),
2970 DLT_CHOICE(PPP_ETHER, "PPPoE"),
2971 DLT_CHOICE(SYMANTEC_FIREWALL, "Symantec Firewall"),
2972 DLT_CHOICE(C_HDLC, "Cisco HDLC"),
2973 DLT_CHOICE(IEEE802_11, "802.11"),
2974 DLT_CHOICE(FRELAY, "Frame Relay"),
2975 DLT_CHOICE(LOOP, "OpenBSD loopback"),
2976 DLT_CHOICE(ENC, "OpenBSD encapsulated IP"),
2977 DLT_CHOICE(LINUX_SLL, "Linux cooked v1"),
2978 DLT_CHOICE(LTALK, "Localtalk"),
2979 DLT_CHOICE(PFLOG, "OpenBSD pflog file"),
2980 DLT_CHOICE(PFSYNC, "Packet filter state syncing"),
2981 DLT_CHOICE(PRISM_HEADER, "802.11 plus Prism header"),
2982 DLT_CHOICE(IP_OVER_FC, "RFC 2625 IP-over-Fibre Channel"),
2983 DLT_CHOICE(SUNATM, "Sun raw ATM"),
2984 DLT_CHOICE(IEEE802_11_RADIO, "802.11 plus radiotap header"),
2985 DLT_CHOICE(ARCNET_LINUX, "Linux ARCNET"),
2986 DLT_CHOICE(JUNIPER_MLPPP, "Juniper Multi-Link PPP"),
2987 DLT_CHOICE(JUNIPER_MLFR, "Juniper Multi-Link Frame Relay"),
2988 DLT_CHOICE(JUNIPER_ES, "Juniper Encryption Services PIC"),
2989 DLT_CHOICE(JUNIPER_GGSN, "Juniper GGSN PIC"),
2990 DLT_CHOICE(JUNIPER_MFR, "Juniper FRF.16 Frame Relay"),
2991 DLT_CHOICE(JUNIPER_ATM2, "Juniper ATM2 PIC"),
2992 DLT_CHOICE(JUNIPER_SERVICES, "Juniper Advanced Services PIC"),
2993 DLT_CHOICE(JUNIPER_ATM1, "Juniper ATM1 PIC"),
2994 DLT_CHOICE(APPLE_IP_OVER_IEEE1394, "Apple IP-over-IEEE 1394"),
2995 DLT_CHOICE(MTP2_WITH_PHDR, "SS7 MTP2 with Pseudo-header"),
2996 DLT_CHOICE(MTP2, "SS7 MTP2"),
2997 DLT_CHOICE(MTP3, "SS7 MTP3"),
2998 DLT_CHOICE(SCCP, "SS7 SCCP"),
2999 DLT_CHOICE(DOCSIS, "DOCSIS"),
3000 DLT_CHOICE(LINUX_IRDA, "Linux IrDA"),
3001 DLT_CHOICE(IEEE802_11_RADIO_AVS, "802.11 plus AVS radio information header"),
3002 DLT_CHOICE(JUNIPER_MONITOR, "Juniper Passive Monitor PIC"),
3003 DLT_CHOICE(BACNET_MS_TP, "BACnet MS/TP"),
3004 DLT_CHOICE(PPP_PPPD, "PPP for pppd, with direction flag"),
3005 DLT_CHOICE(JUNIPER_PPPOE, "Juniper PPPoE"),
3006 DLT_CHOICE(JUNIPER_PPPOE_ATM, "Juniper PPPoE/ATM"),
3007 DLT_CHOICE(GPRS_LLC, "GPRS LLC"),
3008 DLT_CHOICE(GPF_T, "GPF-T"),
3009 DLT_CHOICE(GPF_F, "GPF-F"),
3010 DLT_CHOICE(JUNIPER_PIC_PEER, "Juniper PIC Peer"),
3011 DLT_CHOICE(ERF_ETH, "Ethernet with Endace ERF header"),
3012 DLT_CHOICE(ERF_POS, "Packet-over-SONET with Endace ERF header"),
3013 DLT_CHOICE(LINUX_LAPD, "Linux vISDN LAPD"),
3014 DLT_CHOICE(JUNIPER_ETHER, "Juniper Ethernet"),
3015 DLT_CHOICE(JUNIPER_PPP, "Juniper PPP"),
3016 DLT_CHOICE(JUNIPER_FRELAY, "Juniper Frame Relay"),
3017 DLT_CHOICE(JUNIPER_CHDLC, "Juniper C-HDLC"),
3018 DLT_CHOICE(MFR, "FRF.16 Frame Relay"),
3019 DLT_CHOICE(JUNIPER_VP, "Juniper Voice PIC"),
3020 DLT_CHOICE(A429, "Arinc 429"),
3021 DLT_CHOICE(A653_ICM, "Arinc 653 Interpartition Communication"),
3022 DLT_CHOICE(USB_FREEBSD, "USB with FreeBSD header"),
3023 DLT_CHOICE(BLUETOOTH_HCI_H4, "Bluetooth HCI UART transport layer"),
3024 DLT_CHOICE(IEEE802_16_MAC_CPS, "IEEE 802.16 MAC Common Part Sublayer"),
3025 DLT_CHOICE(USB_LINUX, "USB with Linux header"),
3026 DLT_CHOICE(CAN20B, "Controller Area Network (CAN) v. 2.0B"),
3027 DLT_CHOICE(IEEE802_15_4_LINUX, "IEEE 802.15.4 with Linux padding"),
3028 DLT_CHOICE(PPI, "Per-Packet Information"),
3029 DLT_CHOICE(IEEE802_16_MAC_CPS_RADIO, "IEEE 802.16 MAC Common Part Sublayer plus radiotap header"),
3030 DLT_CHOICE(JUNIPER_ISM, "Juniper Integrated Service Module"),
3031 DLT_CHOICE(IEEE802_15_4, "IEEE 802.15.4 with FCS"),
3032 DLT_CHOICE(SITA, "SITA pseudo-header"),
3033 DLT_CHOICE(ERF, "Endace ERF header"),
3034 DLT_CHOICE(RAIF1, "Ethernet with u10 Networks pseudo-header"),
3035 DLT_CHOICE(IPMB_KONTRON, "IPMB with Kontron pseudo-header"),
3036 DLT_CHOICE(JUNIPER_ST, "Juniper Secure Tunnel"),
3037 DLT_CHOICE(BLUETOOTH_HCI_H4_WITH_PHDR, "Bluetooth HCI UART transport layer plus pseudo-header"),
3038 DLT_CHOICE(AX25_KISS, "AX.25 with KISS header"),
3039 DLT_CHOICE(IPMB_LINUX, "IPMB with Linux/Pigeon Point pseudo-header"),
3040 DLT_CHOICE(IEEE802_15_4_NONASK_PHY, "IEEE 802.15.4 with non-ASK PHY data"),
3041 DLT_CHOICE(MPLS, "MPLS with label as link-layer header"),
3042 DLT_CHOICE(LINUX_EVDEV, "Linux evdev events"),
3043 DLT_CHOICE(USB_LINUX_MMAPPED, "USB with padded Linux header"),
3044 DLT_CHOICE(DECT, "DECT"),
3045 DLT_CHOICE(AOS, "AOS Space Data Link protocol"),
3046 DLT_CHOICE(WIHART, "Wireless HART"),
3047 DLT_CHOICE(FC_2, "Fibre Channel FC-2"),
3048 DLT_CHOICE(FC_2_WITH_FRAME_DELIMS, "Fibre Channel FC-2 with frame delimiters"),
3049 DLT_CHOICE(IPNET, "Solaris ipnet"),
3050 DLT_CHOICE(CAN_SOCKETCAN, "CAN-bus with SocketCAN headers"),
3051 DLT_CHOICE(IPV4, "Raw IPv4"),
3052 DLT_CHOICE(IPV6, "Raw IPv6"),
3053 DLT_CHOICE(IEEE802_15_4_NOFCS, "IEEE 802.15.4 without FCS"),
3054 DLT_CHOICE(DBUS, "D-Bus"),
3055 DLT_CHOICE(JUNIPER_VS, "Juniper Virtual Server"),
3056 DLT_CHOICE(JUNIPER_SRX_E2E, "Juniper SRX E2E"),
3057 DLT_CHOICE(JUNIPER_FIBRECHANNEL, "Juniper Fibre Channel"),
3058 DLT_CHOICE(DVB_CI, "DVB-CI"),
3059 DLT_CHOICE(MUX27010, "MUX27010"),
3060 DLT_CHOICE(STANAG_5066_D_PDU, "STANAG 5066 D_PDUs"),
3061 DLT_CHOICE(JUNIPER_ATM_CEMIC, "Juniper ATM CEMIC"),
3062 DLT_CHOICE(NFLOG, "Linux netfilter log messages"),
3063 DLT_CHOICE(NETANALYZER, "Ethernet with Hilscher netANALYZER pseudo-header"),
3064 DLT_CHOICE(NETANALYZER_TRANSPARENT, "Ethernet with Hilscher netANALYZER pseudo-header and with preamble and SFD"),
3065 DLT_CHOICE(IPOIB, "RFC 4391 IP-over-Infiniband"),
3066 DLT_CHOICE(MPEG_2_TS, "MPEG-2 transport stream"),
3067 DLT_CHOICE(NG40, "ng40 protocol tester Iub/Iur"),
3068 DLT_CHOICE(NFC_LLCP, "NFC LLCP PDUs with pseudo-header"),
3069 DLT_CHOICE(INFINIBAND, "InfiniBand"),
3070 DLT_CHOICE(SCTP, "SCTP"),
3071 DLT_CHOICE(USBPCAP, "USB with USBPcap header"),
3072 DLT_CHOICE(RTAC_SERIAL, "Schweitzer Engineering Laboratories RTAC packets"),
3073 DLT_CHOICE(BLUETOOTH_LE_LL, "Bluetooth Low Energy air interface"),
3074 DLT_CHOICE(NETLINK, "Linux netlink"),
3075 DLT_CHOICE(BLUETOOTH_LINUX_MONITOR, "Bluetooth Linux Monitor"),
3076 DLT_CHOICE(BLUETOOTH_BREDR_BB, "Bluetooth Basic Rate/Enhanced Data Rate baseband packets"),
3077 DLT_CHOICE(BLUETOOTH_LE_LL_WITH_PHDR, "Bluetooth Low Energy air interface with pseudo-header"),
3078 DLT_CHOICE(PROFIBUS_DL, "PROFIBUS data link layer"),
3079 DLT_CHOICE(PKTAP, "Apple DLT_PKTAP"),
3080 DLT_CHOICE(EPON, "Ethernet with 802.3 Clause 65 EPON preamble"),
3081 DLT_CHOICE(IPMI_HPM_2, "IPMI trace packets"),
3082 DLT_CHOICE(ZWAVE_R1_R2, "Z-Wave RF profile R1 and R2 packets"),
3083 DLT_CHOICE(ZWAVE_R3, "Z-Wave RF profile R3 packets"),
3084 DLT_CHOICE(WATTSTOPPER_DLM, "WattStopper Digital Lighting Management (DLM) and Legrand Nitoo Open protocol"),
3085 DLT_CHOICE(ISO_14443, "ISO 14443 messages"),
3086 DLT_CHOICE(RDS, "IEC 62106 Radio Data System groups"),
3087 DLT_CHOICE(USB_DARWIN, "USB with Darwin header"),
3088 DLT_CHOICE(OPENFLOW, "OpenBSD DLT_OPENFLOW"),
3089 DLT_CHOICE(SDLC, "IBM SDLC frames"),
3090 DLT_CHOICE(TI_LLN_SNIFFER, "TI LLN sniffer frames"),
3091 DLT_CHOICE(VSOCK, "Linux vsock"),
3092 DLT_CHOICE(NORDIC_BLE, "Nordic Semiconductor Bluetooth LE sniffer frames"),
3093 DLT_CHOICE(DOCSIS31_XRA31, "Excentis XRA-31 DOCSIS 3.1 RF sniffer frames"),
3094 DLT_CHOICE(ETHERNET_MPACKET, "802.3br mPackets"),
3095 DLT_CHOICE(DISPLAYPORT_AUX, "DisplayPort AUX channel monitoring data"),
3096 DLT_CHOICE(LINUX_SLL2, "Linux cooked v2"),
3101 pcap_datalink_name_to_val(const char *name)
3105 for (i = 0; dlt_choices[i].name != NULL; i++) {
3106 if (pcap_strcasecmp(dlt_choices[i].name, name) == 0)
3107 return (dlt_choices[i].dlt);
3113 pcap_datalink_val_to_name(int dlt)
3117 for (i = 0; dlt_choices[i].name != NULL; i++) {
3118 if (dlt_choices[i].dlt == dlt)
3119 return (dlt_choices[i].name);
3125 pcap_datalink_val_to_description(int dlt)
3129 for (i = 0; dlt_choices[i].name != NULL; i++) {
3130 if (dlt_choices[i].dlt == dlt)
3131 return (dlt_choices[i].description);
3137 pcap_datalink_val_to_description_or_dlt(int dlt)
3139 static char unkbuf[40];
3140 const char *description;
3142 description = pcap_datalink_val_to_description(dlt);
3143 if (description != NULL) {
3146 (void)pcap_snprintf(unkbuf, sizeof(unkbuf), "DLT %u", dlt);
3151 struct tstamp_type_choice {
3153 const char *description;
3157 static struct tstamp_type_choice tstamp_type_choices[] = {
3158 { "host", "Host", PCAP_TSTAMP_HOST },
3159 { "host_lowprec", "Host, low precision", PCAP_TSTAMP_HOST_LOWPREC },
3160 { "host_hiprec", "Host, high precision", PCAP_TSTAMP_HOST_HIPREC },
3161 { "adapter", "Adapter", PCAP_TSTAMP_ADAPTER },
3162 { "adapter_unsynced", "Adapter, not synced with system time", PCAP_TSTAMP_ADAPTER_UNSYNCED },
3167 pcap_tstamp_type_name_to_val(const char *name)
3171 for (i = 0; tstamp_type_choices[i].name != NULL; i++) {
3172 if (pcap_strcasecmp(tstamp_type_choices[i].name, name) == 0)
3173 return (tstamp_type_choices[i].type);
3175 return (PCAP_ERROR);
3179 pcap_tstamp_type_val_to_name(int tstamp_type)
3183 for (i = 0; tstamp_type_choices[i].name != NULL; i++) {
3184 if (tstamp_type_choices[i].type == tstamp_type)
3185 return (tstamp_type_choices[i].name);
3191 pcap_tstamp_type_val_to_description(int tstamp_type)
3195 for (i = 0; tstamp_type_choices[i].name != NULL; i++) {
3196 if (tstamp_type_choices[i].type == tstamp_type)
3197 return (tstamp_type_choices[i].description);
3203 pcap_snapshot(pcap_t *p)
3206 return (PCAP_ERROR_NOT_ACTIVATED);
3207 return (p->snapshot);
3211 pcap_is_swapped(pcap_t *p)
3214 return (PCAP_ERROR_NOT_ACTIVATED);
3215 return (p->swapped);
3219 pcap_major_version(pcap_t *p)
3222 return (PCAP_ERROR_NOT_ACTIVATED);
3223 return (p->version_major);
3227 pcap_minor_version(pcap_t *p)
3230 return (PCAP_ERROR_NOT_ACTIVATED);
3231 return (p->version_minor);
3235 pcap_bufsize(pcap_t *p)
3238 return (PCAP_ERROR_NOT_ACTIVATED);
3239 return (p->bufsize);
3243 pcap_file(pcap_t *p)
3249 pcap_fileno(pcap_t *p)
3254 if (p->handle != INVALID_HANDLE_VALUE)
3255 return ((int)(DWORD)p->handle);
3257 return (PCAP_ERROR);
3261 #if !defined(_WIN32) && !defined(MSDOS)
3263 pcap_get_selectable_fd(pcap_t *p)
3265 return (p->selectable_fd);
3269 pcap_get_required_select_timeout(pcap_t *p)
3271 return (p->required_select_timeout);
3276 pcap_perror(pcap_t *p, const char *prefix)
3278 fprintf(stderr, "%s: %s\n", prefix, p->errbuf);
3282 pcap_geterr(pcap_t *p)
3288 pcap_getnonblock(pcap_t *p, char *errbuf)
3292 ret = p->getnonblock_op(p);
3295 * The get nonblock operation sets p->errbuf; this
3296 * function *shouldn't* have had a separate errbuf
3297 * argument, as it didn't need one, but I goofed
3300 * We copy the error message to errbuf, so callers
3301 * can find it in either place.
3303 pcap_strlcpy(errbuf, p->errbuf, PCAP_ERRBUF_SIZE);
3309 * Get the current non-blocking mode setting, under the assumption that
3310 * it's just the standard POSIX non-blocking flag.
3312 #if !defined(_WIN32) && !defined(MSDOS)
3314 pcap_getnonblock_fd(pcap_t *p)
3318 fdflags = fcntl(p->fd, F_GETFL, 0);
3319 if (fdflags == -1) {
3320 pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
3324 if (fdflags & O_NONBLOCK)
3332 pcap_setnonblock(pcap_t *p, int nonblock, char *errbuf)
3336 ret = p->setnonblock_op(p, nonblock);
3339 * The set nonblock operation sets p->errbuf; this
3340 * function *shouldn't* have had a separate errbuf
3341 * argument, as it didn't need one, but I goofed
3344 * We copy the error message to errbuf, so callers
3345 * can find it in either place.
3347 pcap_strlcpy(errbuf, p->errbuf, PCAP_ERRBUF_SIZE);
3352 #if !defined(_WIN32) && !defined(MSDOS)
3354 * Set non-blocking mode, under the assumption that it's just the
3355 * standard POSIX non-blocking flag. (This can be called by the
3356 * per-platform non-blocking-mode routine if that routine also
3357 * needs to do some additional work.)
3360 pcap_setnonblock_fd(pcap_t *p, int nonblock)
3364 fdflags = fcntl(p->fd, F_GETFL, 0);
3365 if (fdflags == -1) {
3366 pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
3371 fdflags |= O_NONBLOCK;
3373 fdflags &= ~O_NONBLOCK;
3374 if (fcntl(p->fd, F_SETFL, fdflags) == -1) {
3375 pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
3384 * Generate error strings for PCAP_ERROR_ and PCAP_WARNING_ values.
3387 pcap_statustostr(int errnum)
3389 static char ebuf[15+10+1];
3394 return("Generic warning");
3396 case PCAP_WARNING_TSTAMP_TYPE_NOTSUP:
3397 return ("That type of time stamp is not supported by that device");
3399 case PCAP_WARNING_PROMISC_NOTSUP:
3400 return ("That device doesn't support promiscuous mode");
3403 return("Generic error");
3405 case PCAP_ERROR_BREAK:
3406 return("Loop terminated by pcap_breakloop");
3408 case PCAP_ERROR_NOT_ACTIVATED:
3409 return("The pcap_t has not been activated");
3411 case PCAP_ERROR_ACTIVATED:
3412 return ("The setting can't be changed after the pcap_t is activated");
3414 case PCAP_ERROR_NO_SUCH_DEVICE:
3415 return ("No such device exists");
3417 case PCAP_ERROR_RFMON_NOTSUP:
3418 return ("That device doesn't support monitor mode");
3420 case PCAP_ERROR_NOT_RFMON:
3421 return ("That operation is supported only in monitor mode");
3423 case PCAP_ERROR_PERM_DENIED:
3424 return ("You don't have permission to capture on that device");
3426 case PCAP_ERROR_IFACE_NOT_UP:
3427 return ("That device is not up");
3429 case PCAP_ERROR_CANTSET_TSTAMP_TYPE:
3430 return ("That device doesn't support setting the time stamp type");
3432 case PCAP_ERROR_PROMISC_PERM_DENIED:
3433 return ("You don't have permission to capture in promiscuous mode on that device");
3435 case PCAP_ERROR_TSTAMP_PRECISION_NOTSUP:
3436 return ("That device doesn't support that time stamp precision");
3438 (void)pcap_snprintf(ebuf, sizeof ebuf, "Unknown error: %d", errnum);
3443 * Not all systems have strerror().
3446 pcap_strerror(int errnum)
3448 #ifdef HAVE_STRERROR
3450 static char errbuf[PCAP_ERRBUF_SIZE];
3451 errno_t err = strerror_s(errbuf, PCAP_ERRBUF_SIZE, errnum);
3453 if (err != 0) /* err = 0 if successful */
3454 pcap_strlcpy(errbuf, "strerror_s() error", PCAP_ERRBUF_SIZE);
3457 return (strerror(errnum));
3460 extern int sys_nerr;
3461 extern const char *const sys_errlist[];
3462 static char errbuf[PCAP_ERRBUF_SIZE];
3464 if ((unsigned int)errnum < sys_nerr)
3465 return ((char *)sys_errlist[errnum]);
3466 (void)pcap_snprintf(errbuf, sizeof errbuf, "Unknown error: %d", errnum);
3472 pcap_setfilter(pcap_t *p, struct bpf_program *fp)
3474 return (p->setfilter_op(p, fp));
3478 * Set direction flag, which controls whether we accept only incoming
3479 * packets, only outgoing packets, or both.
3480 * Note that, depending on the platform, some or all direction arguments
3481 * might not be supported.
3484 pcap_setdirection(pcap_t *p, pcap_direction_t d)
3486 if (p->setdirection_op == NULL) {
3487 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
3488 "Setting direction is not implemented on this platform");
3491 return (p->setdirection_op(p, d));
3495 pcap_stats(pcap_t *p, struct pcap_stat *ps)
3497 return (p->stats_op(p, ps));
3502 pcap_stats_ex(pcap_t *p, int *pcap_stat_size)
3504 return (p->stats_ex_op(p, pcap_stat_size));
3508 pcap_setbuff(pcap_t *p, int dim)
3510 return (p->setbuff_op(p, dim));
3514 pcap_setmode(pcap_t *p, int mode)
3516 return (p->setmode_op(p, mode));
3520 pcap_setmintocopy(pcap_t *p, int size)
3522 return (p->setmintocopy_op(p, size));
3526 pcap_getevent(pcap_t *p)
3528 return (p->getevent_op(p));
3532 pcap_oid_get_request(pcap_t *p, bpf_u_int32 oid, void *data, size_t *lenp)
3534 return (p->oid_get_request_op(p, oid, data, lenp));
3538 pcap_oid_set_request(pcap_t *p, bpf_u_int32 oid, const void *data, size_t *lenp)
3540 return (p->oid_set_request_op(p, oid, data, lenp));
3544 pcap_sendqueue_alloc(u_int memsize)
3546 pcap_send_queue *tqueue;
3548 /* Allocate the queue */
3549 tqueue = (pcap_send_queue *)malloc(sizeof(pcap_send_queue));
3550 if (tqueue == NULL){
3554 /* Allocate the buffer */
3555 tqueue->buffer = (char *)malloc(memsize);
3556 if (tqueue->buffer == NULL) {
3561 tqueue->maxlen = memsize;
3568 pcap_sendqueue_destroy(pcap_send_queue *queue)
3570 free(queue->buffer);
3575 pcap_sendqueue_queue(pcap_send_queue *queue, const struct pcap_pkthdr *pkt_header, const u_char *pkt_data)
3577 if (queue->len + sizeof(struct pcap_pkthdr) + pkt_header->caplen > queue->maxlen){
3581 /* Copy the pcap_pkthdr header*/
3582 memcpy(queue->buffer + queue->len, pkt_header, sizeof(struct pcap_pkthdr));
3583 queue->len += sizeof(struct pcap_pkthdr);
3585 /* copy the packet */
3586 memcpy(queue->buffer + queue->len, pkt_data, pkt_header->caplen);
3587 queue->len += pkt_header->caplen;
3593 pcap_sendqueue_transmit(pcap_t *p, pcap_send_queue *queue, int sync)
3595 return (p->sendqueue_transmit_op(p, queue, sync));
3599 pcap_setuserbuffer(pcap_t *p, int size)
3601 return (p->setuserbuffer_op(p, size));
3605 pcap_live_dump(pcap_t *p, char *filename, int maxsize, int maxpacks)
3607 return (p->live_dump_op(p, filename, maxsize, maxpacks));
3611 pcap_live_dump_ended(pcap_t *p, int sync)
3613 return (p->live_dump_ended_op(p, sync));
3617 pcap_get_airpcap_handle(pcap_t *p)
3619 PAirpcapHandle handle;
3621 handle = p->get_airpcap_handle_op(p);
3622 if (handle == NULL) {
3623 (void)pcap_snprintf(p->errbuf, sizeof(p->errbuf),
3624 "This isn't an AirPcap device");
3631 * On some platforms, we need to clean up promiscuous or monitor mode
3632 * when we close a device - and we want that to happen even if the
3633 * application just exits without explicitl closing devices.
3634 * On those platforms, we need to register a "close all the pcaps"
3635 * routine to be called when we exit, and need to maintain a list of
3636 * pcaps that need to be closed to clean up modes.
3638 * XXX - not thread-safe.
3642 * List of pcaps on which we've done something that needs to be
3644 * If there are any such pcaps, we arrange to call "pcap_close_all()"
3645 * when we exit, and have it close all of them.
3647 static struct pcap *pcaps_to_close;
3650 * TRUE if we've already called "atexit()" to cause "pcap_close_all()" to
3651 * be called on exit.
3653 static int did_atexit;
3656 pcap_close_all(void)
3658 struct pcap *handle;
3660 while ((handle = pcaps_to_close) != NULL)
3665 pcap_do_addexit(pcap_t *p)
3668 * If we haven't already done so, arrange to have
3669 * "pcap_close_all()" called when we exit.
3672 if (atexit(pcap_close_all) != 0) {
3674 * "atexit()" failed; let our caller know.
3676 pcap_strlcpy(p->errbuf, "atexit failed", PCAP_ERRBUF_SIZE);
3685 pcap_add_to_pcaps_to_close(pcap_t *p)
3687 p->next = pcaps_to_close;
3692 pcap_remove_from_pcaps_to_close(pcap_t *p)
3694 pcap_t *pc, *prevpc;
3696 for (pc = pcaps_to_close, prevpc = NULL; pc != NULL;
3697 prevpc = pc, pc = pc->next) {
3700 * Found it. Remove it from the list.
3702 if (prevpc == NULL) {
3704 * It was at the head of the list.
3706 pcaps_to_close = pc->next;
3709 * It was in the middle of the list.
3711 prevpc->next = pc->next;
3719 pcap_cleanup_live_common(pcap_t *p)
3721 if (p->buffer != NULL) {
3725 if (p->dlt_list != NULL) {
3730 if (p->tstamp_type_list != NULL) {
3731 free(p->tstamp_type_list);
3732 p->tstamp_type_list = NULL;
3733 p->tstamp_type_count = 0;
3735 if (p->tstamp_precision_list != NULL) {
3736 free(p->tstamp_precision_list);
3737 p->tstamp_precision_list = NULL;
3738 p->tstamp_precision_count = 0;
3740 pcap_freecode(&p->fcode);
3741 #if !defined(_WIN32) && !defined(MSDOS)
3746 p->selectable_fd = -1;
3751 * API compatible with WinPcap's "send a packet" routine - returns -1
3752 * on error, 0 otherwise.
3754 * XXX - what if we get a short write?
3757 pcap_sendpacket(pcap_t *p, const u_char *buf, int size)
3759 if (p->inject_op(p, buf, size) == -1)
3765 * API compatible with OpenBSD's "send a packet" routine - returns -1 on
3766 * error, number of bytes written otherwise.
3769 pcap_inject(pcap_t *p, const void *buf, size_t size)
3771 return (p->inject_op(p, buf, size));
3775 pcap_close(pcap_t *p)
3777 if (p->opt.device != NULL)
3778 free(p->opt.device);
3784 * Given a BPF program, a pcap_pkthdr structure for a packet, and the raw
3785 * data for the packet, check whether the packet passes the filter.
3786 * Returns the return value of the filter program, which will be zero if
3787 * the packet doesn't pass and non-zero if the packet does pass.
3790 pcap_offline_filter(const struct bpf_program *fp, const struct pcap_pkthdr *h,
3793 const struct bpf_insn *fcode = fp->bf_insns;
3796 return (bpf_filter(fcode, pkt, h->len, h->caplen));
3802 pcap_can_set_rfmon_dead(pcap_t *p)
3804 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
3805 "Rfmon mode doesn't apply on a pcap_open_dead pcap_t");
3806 return (PCAP_ERROR);
3810 pcap_read_dead(pcap_t *p, int cnt _U_, pcap_handler callback _U_,
3813 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
3814 "Packets aren't available from a pcap_open_dead pcap_t");
3819 pcap_inject_dead(pcap_t *p, const void *buf _U_, size_t size _U_)
3821 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
3822 "Packets can't be sent on a pcap_open_dead pcap_t");
3827 pcap_setfilter_dead(pcap_t *p, struct bpf_program *fp _U_)
3829 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
3830 "A filter cannot be set on a pcap_open_dead pcap_t");
3835 pcap_setdirection_dead(pcap_t *p, pcap_direction_t d _U_)
3837 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
3838 "The packet direction cannot be set on a pcap_open_dead pcap_t");
3843 pcap_set_datalink_dead(pcap_t *p, int dlt _U_)
3845 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
3846 "The link-layer header type cannot be set on a pcap_open_dead pcap_t");
3851 pcap_getnonblock_dead(pcap_t *p)
3853 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
3854 "A pcap_open_dead pcap_t does not have a non-blocking mode setting");
3859 pcap_setnonblock_dead(pcap_t *p, int nonblock _U_)
3861 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
3862 "A pcap_open_dead pcap_t does not have a non-blocking mode setting");
3867 pcap_stats_dead(pcap_t *p, struct pcap_stat *ps _U_)
3869 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
3870 "Statistics aren't available from a pcap_open_dead pcap_t");
3876 pcap_stats_ex_dead(pcap_t *p, int *pcap_stat_size _U_)
3878 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
3879 "Statistics aren't available from a pcap_open_dead pcap_t");
3884 pcap_setbuff_dead(pcap_t *p, int dim)
3886 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
3887 "The kernel buffer size cannot be set on a pcap_open_dead pcap_t");
3892 pcap_setmode_dead(pcap_t *p, int mode)
3894 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
3895 "impossible to set mode on a pcap_open_dead pcap_t");
3900 pcap_setmintocopy_dead(pcap_t *p, int size)
3902 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
3903 "The mintocopy parameter cannot be set on a pcap_open_dead pcap_t");
3908 pcap_getevent_dead(pcap_t *p)
3910 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
3911 "A pcap_open_dead pcap_t has no event handle");
3912 return (INVALID_HANDLE_VALUE);
3916 pcap_oid_get_request_dead(pcap_t *p, bpf_u_int32 oid _U_, void *data _U_,
3919 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
3920 "An OID get request cannot be performed on a pcap_open_dead pcap_t");
3921 return (PCAP_ERROR);
3925 pcap_oid_set_request_dead(pcap_t *p, bpf_u_int32 oid _U_, const void *data _U_,
3928 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
3929 "An OID set request cannot be performed on a pcap_open_dead pcap_t");
3930 return (PCAP_ERROR);
3934 pcap_sendqueue_transmit_dead(pcap_t *p, pcap_send_queue *queue, int sync)
3936 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
3937 "Packets cannot be transmitted on a pcap_open_dead pcap_t");
3942 pcap_setuserbuffer_dead(pcap_t *p, int size)
3944 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
3945 "The user buffer cannot be set on a pcap_open_dead pcap_t");
3950 pcap_live_dump_dead(pcap_t *p, char *filename, int maxsize, int maxpacks)
3952 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
3953 "Live packet dumping cannot be performed on a pcap_open_dead pcap_t");
3958 pcap_live_dump_ended_dead(pcap_t *p, int sync)
3960 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
3961 "Live packet dumping cannot be performed on a pcap_open_dead pcap_t");
3965 static PAirpcapHandle
3966 pcap_get_airpcap_handle_dead(pcap_t *p)
3973 pcap_cleanup_dead(pcap_t *p _U_)
3975 /* Nothing to do. */
3979 pcap_open_dead_with_tstamp_precision(int linktype, int snaplen, u_int precision)
3983 switch (precision) {
3985 case PCAP_TSTAMP_PRECISION_MICRO:
3986 case PCAP_TSTAMP_PRECISION_NANO:
3991 * This doesn't really matter, but we don't have any way
3992 * to report particular errors, so the only failure we
3993 * should have is a memory allocation failure. Just
3994 * pick microsecond precision.
3996 precision = PCAP_TSTAMP_PRECISION_MICRO;
3999 p = malloc(sizeof(*p));
4002 memset (p, 0, sizeof(*p));
4003 p->snapshot = snaplen;
4004 p->linktype = linktype;
4005 p->opt.tstamp_precision = precision;
4006 p->can_set_rfmon_op = pcap_can_set_rfmon_dead;
4007 p->read_op = pcap_read_dead;
4008 p->inject_op = pcap_inject_dead;
4009 p->setfilter_op = pcap_setfilter_dead;
4010 p->setdirection_op = pcap_setdirection_dead;
4011 p->set_datalink_op = pcap_set_datalink_dead;
4012 p->getnonblock_op = pcap_getnonblock_dead;
4013 p->setnonblock_op = pcap_setnonblock_dead;
4014 p->stats_op = pcap_stats_dead;
4016 p->stats_ex_op = pcap_stats_ex_dead;
4017 p->setbuff_op = pcap_setbuff_dead;
4018 p->setmode_op = pcap_setmode_dead;
4019 p->setmintocopy_op = pcap_setmintocopy_dead;
4020 p->getevent_op = pcap_getevent_dead;
4021 p->oid_get_request_op = pcap_oid_get_request_dead;
4022 p->oid_set_request_op = pcap_oid_set_request_dead;
4023 p->sendqueue_transmit_op = pcap_sendqueue_transmit_dead;
4024 p->setuserbuffer_op = pcap_setuserbuffer_dead;
4025 p->live_dump_op = pcap_live_dump_dead;
4026 p->live_dump_ended_op = pcap_live_dump_ended_dead;
4027 p->get_airpcap_handle_op = pcap_get_airpcap_handle_dead;
4029 p->cleanup_op = pcap_cleanup_dead;
4032 * A "dead" pcap_t never requires special BPF code generation.
4034 p->bpf_codegen_flags = 0;
4041 pcap_open_dead(int linktype, int snaplen)
4043 return (pcap_open_dead_with_tstamp_precision(linktype, snaplen,
4044 PCAP_TSTAMP_PRECISION_MICRO));
4049 * Set the internal "debug printout" flag for the filter expression parser.
4050 * The code to print that stuff is present only if YYDEBUG is defined, so
4051 * the flag, and the routine to set it, are defined only if YYDEBUG is
4054 * This is intended for libpcap developers, not for general use.
4055 * If you want to set these in a program, you'll have to declare this
4056 * routine yourself, with the appropriate DLL import attribute on Windows;
4057 * it's not declared in any header file, and won't be declared in any
4058 * header file provided by libpcap.
4060 PCAP_API void pcap_set_parser_debug(int value);
4063 pcap_set_parser_debug(int value)