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android / platform / external / libpcap / refs/heads/android-t-preview-1 / . / pcap.c
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/*
* Copyright (c) 1993, 1994, 1995, 1996, 1997, 1998
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the Computer Systems
* Engineering Group at Lawrence Berkeley Laboratory.
* 4. Neither the name of the University nor of the Laboratory may be used
* to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <pcap-types.h>
#ifndef _WIN32
#include <sys/param.h>
#ifndef MSDOS
#include <sys/file.h>
#endif
#include <sys/ioctl.h>
#include <sys/socket.h>
#ifdef HAVE_SYS_SOCKIO_H
#include <sys/sockio.h>
#endif
struct mbuf; /* Squelch compiler warnings on some platforms for */
struct rtentry; /* declarations in <net/if.h> */
#include <net/if.h>
#include <netinet/in.h>
#endif /* _WIN32 */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#if !defined(_MSC_VER) && !defined(__BORLANDC__) && !defined(__MINGW32__)
#include <unistd.h>
#endif
#include <fcntl.h>
#include <errno.h>
#include <limits.h>
#include "diag-control.h"
#ifdef HAVE_OS_PROTO_H
#include "os-proto.h"
#endif
#ifdef MSDOS
#include "pcap-dos.h"
#endif
#include "pcap-int.h"
#include "optimize.h"
#ifdef HAVE_DAG_API
#include "pcap-dag.h"
#endif /* HAVE_DAG_API */
#ifdef HAVE_SEPTEL_API
#include "pcap-septel.h"
#endif /* HAVE_SEPTEL_API */
#ifdef HAVE_SNF_API
#include "pcap-snf.h"
#endif /* HAVE_SNF_API */
#ifdef HAVE_TC_API
#include "pcap-tc.h"
#endif /* HAVE_TC_API */
#ifdef PCAP_SUPPORT_LINUX_USBMON
#include "pcap-usb-linux.h"
#endif
#ifdef PCAP_SUPPORT_BT
#include "pcap-bt-linux.h"
#endif
#ifdef PCAP_SUPPORT_BT_MONITOR
#include "pcap-bt-monitor-linux.h"
#endif
#ifdef PCAP_SUPPORT_NETFILTER
#include "pcap-netfilter-linux.h"
#endif
#ifdef PCAP_SUPPORT_NETMAP
#include "pcap-netmap.h"
#endif
#ifdef PCAP_SUPPORT_DBUS
#include "pcap-dbus.h"
#endif
#ifdef PCAP_SUPPORT_RDMASNIFF
#include "pcap-rdmasniff.h"
#endif
#ifdef PCAP_SUPPORT_DPDK
#include "pcap-dpdk.h"
#endif
#ifdef HAVE_AIRPCAP_API
#include "pcap-airpcap.h"
#endif
#ifdef _WIN32
/*
* DllMain(), required when built as a Windows DLL.
*
* To quote the WSAStartup() documentation:
*
* The WSAStartup function typically leads to protocol-specific helper
* DLLs being loaded. As a result, the WSAStartup function should not
* be called from the DllMain function in a application DLL. This can
* potentially cause deadlocks.
*
* and the WSACleanup() documentation:
*
* The WSACleanup function typically leads to protocol-specific helper
* DLLs being unloaded. As a result, the WSACleanup function should not
* be called from the DllMain function in a application DLL. This can
* potentially cause deadlocks.
*
* So we don't initialize Winsock here. pcap_init() should be called
* to initialize pcap on both UN*X and Windows; it will initialize
* Winsock on Windows. (It will also be initialized as needed if
* pcap_init() hasn't been called.)
*/
BOOL WINAPI DllMain(
HANDLE hinstDLL _U_,
DWORD dwReason _U_,
LPVOID lpvReserved _U_
)
{
return (TRUE);
}
/*
* Start Winsock.
* Internal routine.
*/
static int
internal_wsockinit(char *errbuf)
{
WORD wVersionRequested;
WSADATA wsaData;
static int err = -1;
static int done = 0;
int status;
if (done)
return (err);
/*
* Versions of Windows that don't support Winsock 2.2 are
* too old for us.
*/
wVersionRequested = MAKEWORD(2, 2);
status = WSAStartup(wVersionRequested, &wsaData);
done = 1;
if (status != 0) {
if (errbuf != NULL) {
pcap_fmt_errmsg_for_win32_err(errbuf, PCAP_ERRBUF_SIZE,
status, "WSAStartup() failed");
}
return (err);
}
atexit ((void(*)(void))WSACleanup);
err = 0;
return (err);
}
/*
* Exported in case some applications using WinPcap/Npcap called it,
* even though it wasn't exported.
*/
int
wsockinit(void)
{
return (internal_wsockinit(NULL));
}
/*
* This is the exported function; new programs should call this.
* *Newer* programs should call pcap_init().
*/
int
pcap_wsockinit(void)
{
return (internal_wsockinit(NULL));
}
#endif /* _WIN32 */
/*
* Do whatever initialization is needed for libpcap.
*
* The argument specifies whether we use the local code page or UTF-8
* for strings; on UN*X, we just assume UTF-8 in places where the encoding
* would matter, whereas, on Windows, we use the local code page for
* PCAP_CHAR_ENC_LOCAL and UTF-8 for PCAP_CHAR_ENC_UTF_8.
*
* On Windows, we also disable the hack in pcap_create() to deal with
* being handed UTF-16 strings, because if the user calls this they're
* explicitly declaring that they will either be passing local code
* page strings or UTF-8 strings, so we don't need to allow UTF-16LE
* strings to be passed. For good measure, on Windows *and* UN*X,
* we disable pcap_lookupdev(), to prevent anybody from even
* *trying* to pass the result of pcap_lookupdev() - which might be
* UTF-16LE on Windows, for ugly compatibility reasons - to pcap_create()
* or pcap_open_live() or pcap_open().
*
* Returns 0 on success, -1 on error.
*/
int pcap_new_api; /* pcap_lookupdev() always fails */
int pcap_utf_8_mode; /* Strings should be in UTF-8. */
int
pcap_init(unsigned int opts, char *errbuf)
{
static int initialized;
/*
* Don't allow multiple calls that set different modes; that
* may mean a library is initializing pcap in one mode and
* a program using that library, or another library used by
* that program, is initializing it in another mode.
*/
switch (opts) {
case PCAP_CHAR_ENC_LOCAL:
/* Leave "UTF-8 mode" off. */
if (initialized) {
if (pcap_utf_8_mode) {
snprintf(errbuf, PCAP_ERRBUF_SIZE,
"Multiple pcap_init calls with different character encodings");
return (-1);
}
}
break;
case PCAP_CHAR_ENC_UTF_8:
/* Turn on "UTF-8 mode". */
if (initialized) {
if (!pcap_utf_8_mode) {
snprintf(errbuf, PCAP_ERRBUF_SIZE,
"Multiple pcap_init calls with different character encodings");
return (-1);
}
}
pcap_utf_8_mode = 1;
break;
default:
snprintf(errbuf, PCAP_ERRBUF_SIZE, "Unknown options specified");
return (-1);
}
/*
* Turn the appropriate mode on for error messages; those routines
* are also used in rpcapd, which has no access to pcap's internal
* UTF-8 mode flag, so we have to call a routine to set its
* UTF-8 mode flag.
*/
pcap_fmt_set_encoding(opts);
if (initialized) {
/*
* Nothing more to do; for example, on Windows, we've
* already initialized Winsock.
*/
return (0);
}
#ifdef _WIN32
/*
* Now set up Winsock.
*/
if (internal_wsockinit(errbuf) == -1) {
/* Failed. */
return (-1);
}
#endif
/*
* We're done.
*/
initialized = 1;
pcap_new_api = 1;
return (0);
}
/*
* String containing the library version.
* Not explicitly exported via a header file - the right API to use
* is pcap_lib_version() - but some programs included it, so we
* provide it.
*
* We declare it here, right before defining it, to squelch any
* warnings we might get from compilers about the lack of a
* declaration.
*/
PCAP_API char pcap_version[];
PCAP_API_DEF char pcap_version[] = PACKAGE_VERSION;
static void
pcap_set_not_initialized_message(pcap_t *pcap)
{
if (pcap->activated) {
/* A module probably forgot to set the function pointer */
(void)snprintf(pcap->errbuf, sizeof(pcap->errbuf),
"This operation isn't properly handled by that device");
return;
}
/* in case the caller doesn't check for PCAP_ERROR_NOT_ACTIVATED */
(void)snprintf(pcap->errbuf, sizeof(pcap->errbuf),
"This handle hasn't been activated yet");
}
static int
pcap_read_not_initialized(pcap_t *pcap, int cnt _U_, pcap_handler callback _U_,
u_char *user _U_)
{
pcap_set_not_initialized_message(pcap);
/* this means 'not initialized' */
return (PCAP_ERROR_NOT_ACTIVATED);
}
static int
pcap_inject_not_initialized(pcap_t *pcap, const void * buf _U_, int size _U_)
{
pcap_set_not_initialized_message(pcap);
/* this means 'not initialized' */
return (PCAP_ERROR_NOT_ACTIVATED);
}
static int
pcap_setfilter_not_initialized(pcap_t *pcap, struct bpf_program *fp _U_)
{
pcap_set_not_initialized_message(pcap);
/* this means 'not initialized' */
return (PCAP_ERROR_NOT_ACTIVATED);
}
static int
pcap_setdirection_not_initialized(pcap_t *pcap, pcap_direction_t d _U_)
{
pcap_set_not_initialized_message(pcap);
/* this means 'not initialized' */
return (PCAP_ERROR_NOT_ACTIVATED);
}
static int
pcap_set_datalink_not_initialized(pcap_t *pcap, int dlt _U_)
{
pcap_set_not_initialized_message(pcap);
/* this means 'not initialized' */
return (PCAP_ERROR_NOT_ACTIVATED);
}
static int
pcap_getnonblock_not_initialized(pcap_t *pcap)
{
pcap_set_not_initialized_message(pcap);
/* this means 'not initialized' */
return (PCAP_ERROR_NOT_ACTIVATED);
}
static int
pcap_stats_not_initialized(pcap_t *pcap, struct pcap_stat *ps _U_)
{
pcap_set_not_initialized_message(pcap);
/* this means 'not initialized' */
return (PCAP_ERROR_NOT_ACTIVATED);
}
#ifdef _WIN32
static struct pcap_stat *
pcap_stats_ex_not_initialized(pcap_t *pcap, int *pcap_stat_size _U_)
{
pcap_set_not_initialized_message(pcap);
return (NULL);
}
static int
pcap_setbuff_not_initialized(pcap_t *pcap, int dim _U_)
{
pcap_set_not_initialized_message(pcap);
/* this means 'not initialized' */
return (PCAP_ERROR_NOT_ACTIVATED);
}
static int
pcap_setmode_not_initialized(pcap_t *pcap, int mode _U_)
{
pcap_set_not_initialized_message(pcap);
/* this means 'not initialized' */
return (PCAP_ERROR_NOT_ACTIVATED);
}
static int
pcap_setmintocopy_not_initialized(pcap_t *pcap, int size _U_)
{
pcap_set_not_initialized_message(pcap);
/* this means 'not initialized' */
return (PCAP_ERROR_NOT_ACTIVATED);
}
static HANDLE
pcap_getevent_not_initialized(pcap_t *pcap)
{
pcap_set_not_initialized_message(pcap);
return (INVALID_HANDLE_VALUE);
}
static int
pcap_oid_get_request_not_initialized(pcap_t *pcap, bpf_u_int32 oid _U_,
void *data _U_, size_t *lenp _U_)
{
pcap_set_not_initialized_message(pcap);
return (PCAP_ERROR_NOT_ACTIVATED);
}
static int
pcap_oid_set_request_not_initialized(pcap_t *pcap, bpf_u_int32 oid _U_,
const void *data _U_, size_t *lenp _U_)
{
pcap_set_not_initialized_message(pcap);
return (PCAP_ERROR_NOT_ACTIVATED);
}
static u_int
pcap_sendqueue_transmit_not_initialized(pcap_t *pcap, pcap_send_queue* queue _U_,
int sync _U_)
{
pcap_set_not_initialized_message(pcap);
return (0);
}
static int
pcap_setuserbuffer_not_initialized(pcap_t *pcap, int size _U_)
{
pcap_set_not_initialized_message(pcap);
return (PCAP_ERROR_NOT_ACTIVATED);
}
static int
pcap_live_dump_not_initialized(pcap_t *pcap, char *filename _U_, int maxsize _U_,
int maxpacks _U_)
{
pcap_set_not_initialized_message(pcap);
return (PCAP_ERROR_NOT_ACTIVATED);
}
static int
pcap_live_dump_ended_not_initialized(pcap_t *pcap, int sync _U_)
{
pcap_set_not_initialized_message(pcap);
return (PCAP_ERROR_NOT_ACTIVATED);
}
static PAirpcapHandle
pcap_get_airpcap_handle_not_initialized(pcap_t *pcap)
{
pcap_set_not_initialized_message(pcap);
return (NULL);
}
#endif
/*
* Returns 1 if rfmon mode can be set on the pcap_t, 0 if it can't,
* a PCAP_ERROR value on an error.
*/
int
pcap_can_set_rfmon(pcap_t *p)
{
return (p->can_set_rfmon_op(p));
}
/*
* For systems where rfmon mode is never supported.
*/
static int
pcap_cant_set_rfmon(pcap_t *p _U_)
{
return (0);
}
/*
* Sets *tstamp_typesp to point to an array 1 or more supported time stamp
* types; the return value is the number of supported time stamp types.
* The list should be freed by a call to pcap_free_tstamp_types() when
* you're done with it.
*
* A return value of 0 means "you don't get a choice of time stamp type",
* in which case *tstamp_typesp is set to null.
*
* PCAP_ERROR is returned on error.
*/
int
pcap_list_tstamp_types(pcap_t *p, int **tstamp_typesp)
{
if (p->tstamp_type_count == 0) {
/*
* We don't support multiple time stamp types.
* That means the only type we support is PCAP_TSTAMP_HOST;
* set up a list containing only that type.
*/
*tstamp_typesp = (int*)malloc(sizeof(**tstamp_typesp));
if (*tstamp_typesp == NULL) {
pcap_fmt_errmsg_for_errno(p->errbuf, sizeof(p->errbuf),
errno, "malloc");
return (PCAP_ERROR);
}
**tstamp_typesp = PCAP_TSTAMP_HOST;
return (1);
} else {
*tstamp_typesp = (int*)calloc(sizeof(**tstamp_typesp),
p->tstamp_type_count);
if (*tstamp_typesp == NULL) {
pcap_fmt_errmsg_for_errno(p->errbuf, sizeof(p->errbuf),
errno, "malloc");
return (PCAP_ERROR);
}
(void)memcpy(*tstamp_typesp, p->tstamp_type_list,
sizeof(**tstamp_typesp) * p->tstamp_type_count);
return (p->tstamp_type_count);
}
}
/*
* In Windows, you might have a library built with one version of the
* C runtime library and an application built with another version of
* the C runtime library, which means that the library might use one
* version of malloc() and free() and the application might use another
* version of malloc() and free(). If so, that means something
* allocated by the library cannot be freed by the application, so we
* need to have a pcap_free_tstamp_types() routine to free up the list
* allocated by pcap_list_tstamp_types(), even though it's just a wrapper
* around free().
*/
void
pcap_free_tstamp_types(int *tstamp_type_list)
{
free(tstamp_type_list);
}
/*
* Default one-shot callback; overridden for capture types where the
* packet data cannot be guaranteed to be available after the callback
* returns, so that a copy must be made.
*/
void
pcap_oneshot(u_char *user, const struct pcap_pkthdr *h, const u_char *pkt)
{
struct oneshot_userdata *sp = (struct oneshot_userdata *)user;
*sp->hdr = *h;
*sp->pkt = pkt;
}
const u_char *
pcap_next(pcap_t *p, struct pcap_pkthdr *h)
{
struct oneshot_userdata s;
const u_char *pkt;
s.hdr = h;
s.pkt = &pkt;
s.pd = p;
if (pcap_dispatch(p, 1, p->oneshot_callback, (u_char *)&s) <= 0)
return (0);
return (pkt);
}
int
pcap_next_ex(pcap_t *p, struct pcap_pkthdr **pkt_header,
const u_char **pkt_data)
{
struct oneshot_userdata s;
s.hdr = &p->pcap_header;
s.pkt = pkt_data;
s.pd = p;
/* Saves a pointer to the packet headers */
*pkt_header= &p->pcap_header;
if (p->rfile != NULL) {
int status;
/* We are on an offline capture */
status = pcap_offline_read(p, 1, p->oneshot_callback,
(u_char *)&s);
/*
* Return codes for pcap_offline_read() are:
* - 0: EOF
* - -1: error
* - >1: OK
* The first one ('0') conflicts with the return code of
* 0 from pcap_read() meaning "no packets arrived before
* the timeout expired", so we map it to -2 so you can
* distinguish between an EOF from a savefile and a
* "no packets arrived before the timeout expired, try
* again" from a live capture.
*/
if (status == 0)
return (-2);
else
return (status);
}
/*
* Return codes for pcap_read() are:
* - 0: timeout
* - -1: error
* - -2: loop was broken out of with pcap_breakloop()
* - >1: OK
* The first one ('0') conflicts with the return code of 0 from
* pcap_offline_read() meaning "end of file".
*/
return (p->read_op(p, 1, p->oneshot_callback, (u_char *)&s));
}
/*
* Implementation of a pcap_if_list_t.
*/
struct pcap_if_list {
pcap_if_t *beginning;
};
static struct capture_source_type {
int (*findalldevs_op)(pcap_if_list_t *, char *);
pcap_t *(*create_op)(const char *, char *, int *);
} capture_source_types[] = {
#ifdef HAVE_DAG_API
{ dag_findalldevs, dag_create },
#endif
#ifdef HAVE_SEPTEL_API
{ septel_findalldevs, septel_create },
#endif
#ifdef HAVE_SNF_API
{ snf_findalldevs, snf_create },
#endif
#ifdef HAVE_TC_API
{ TcFindAllDevs, TcCreate },
#endif
#ifdef PCAP_SUPPORT_BT
{ bt_findalldevs, bt_create },
#endif
#ifdef PCAP_SUPPORT_BT_MONITOR
{ bt_monitor_findalldevs, bt_monitor_create },
#endif
#ifdef PCAP_SUPPORT_LINUX_USBMON
{ usb_findalldevs, usb_create },
#endif
#ifdef PCAP_SUPPORT_NETFILTER
{ netfilter_findalldevs, netfilter_create },
#endif
#ifdef PCAP_SUPPORT_NETMAP
{ pcap_netmap_findalldevs, pcap_netmap_create },
#endif
#ifdef PCAP_SUPPORT_DBUS
{ dbus_findalldevs, dbus_create },
#endif
#ifdef PCAP_SUPPORT_RDMASNIFF
{ rdmasniff_findalldevs, rdmasniff_create },
#endif
#ifdef PCAP_SUPPORT_DPDK
{ pcap_dpdk_findalldevs, pcap_dpdk_create },
#endif
#ifdef HAVE_AIRPCAP_API
{ airpcap_findalldevs, airpcap_create },
#endif
{ NULL, NULL }
};
/*
* Get a list of all capture sources that are up and that we can open.
* Returns -1 on error, 0 otherwise.
* The list, as returned through "alldevsp", may be null if no interfaces
* were up and could be opened.
*/
int
pcap_findalldevs(pcap_if_t **alldevsp, char *errbuf)
{
size_t i;
pcap_if_list_t devlist;
/*
* Find all the local network interfaces on which we
* can capture.
*/
devlist.beginning = NULL;
if (pcap_platform_finddevs(&devlist, errbuf) == -1) {
/*
* Failed - free all of the entries we were given
* before we failed.
*/
if (devlist.beginning != NULL)
pcap_freealldevs(devlist.beginning);
*alldevsp = NULL;
return (-1);
}
/*
* Ask each of the non-local-network-interface capture
* source types what interfaces they have.
*/
for (i = 0; capture_source_types[i].findalldevs_op != NULL; i++) {
if (capture_source_types[i].findalldevs_op(&devlist, errbuf) == -1) {
/*
* We had an error; free the list we've been
* constructing.
*/
if (devlist.beginning != NULL)
pcap_freealldevs(devlist.beginning);
*alldevsp = NULL;
return (-1);
}
}
/*
* Return the first entry of the list of all devices.
*/
*alldevsp = devlist.beginning;
return (0);
}
static struct sockaddr *
dup_sockaddr(struct sockaddr *sa, size_t sa_length)
{
struct sockaddr *newsa;
if ((newsa = malloc(sa_length)) == NULL)
return (NULL);
return (memcpy(newsa, sa, sa_length));
}
/*
* Construct a "figure of merit" for an interface, for use when sorting
* the list of interfaces, in which interfaces that are up are superior
* to interfaces that aren't up, interfaces that are up and running are
* superior to interfaces that are up but not running, and non-loopback
* interfaces that are up and running are superior to loopback interfaces,
* and interfaces with the same flags have a figure of merit that's higher
* the lower the instance number.
*
* The goal is to try to put the interfaces most likely to be useful for
* capture at the beginning of the list.
*
* The figure of merit, which is lower the "better" the interface is,
* has the uppermost bit set if the interface isn't running, the bit
* below that set if the interface isn't up, the bit below that
* set if the interface is a loopback interface, and the bit below
* that set if it's the "any" interface.
*
* Note: we don't sort by unit number because 1) not all interfaces have
* a unit number (systemd, for example, might assign interface names
* based on the interface's MAC address or on the physical location of
* the adapter's connector), and 2) if the name does end with a simple
* unit number, it's not a global property of the interface, it's only
* useful as a sort key for device names with the same prefix, so xyz0
* shouldn't necessarily sort before abc2. This means that interfaces
* with the same figure of merit will be sorted by the order in which
* the mechanism from which we're getting the interfaces supplies them.
*/
static u_int
get_figure_of_merit(pcap_if_t *dev)
{
u_int n;
n = 0;
if (!(dev->flags & PCAP_IF_RUNNING))
n |= 0x80000000;
if (!(dev->flags & PCAP_IF_UP))
n |= 0x40000000;
/*
* Give non-wireless interfaces that aren't disconnected a better
* figure of merit than interfaces that are disconnected, as
* "disconnected" should indicate that the interface isn't
* plugged into a network and thus won't give you any traffic.
*
* For wireless interfaces, it means "associated with a network",
* which we presume not to necessarily prevent capture, as you
* might run the adapter in some flavor of monitor mode.
*/
if (!(dev->flags & PCAP_IF_WIRELESS) &&
(dev->flags & PCAP_IF_CONNECTION_STATUS) == PCAP_IF_CONNECTION_STATUS_DISCONNECTED)
n |= 0x20000000;
/*
* Sort loopback devices after non-loopback devices, *except* for
* disconnected devices.
*/
if (dev->flags & PCAP_IF_LOOPBACK)
n |= 0x10000000;
/*
* Sort the "any" device before loopback and disconnected devices,
* but after all other devices.
*/
if (strcmp(dev->name, "any") == 0)
n |= 0x08000000;
return (n);
}
#ifndef _WIN32
/*
* Try to get a description for a given device.
* Returns a mallocated description if it could and NULL if it couldn't.
*
* XXX - on FreeBSDs that support it, should it get the sysctl named
* "dev.{adapter family name}.{adapter unit}.%desc" to get a description
* of the adapter? Note that "dev.an.0.%desc" is "Aironet PC4500/PC4800"
* with my Cisco 350 card, so the name isn't entirely descriptive. The
* "dev.an.0.%pnpinfo" has a better description, although one might argue
* that the problem is really a driver bug - if it can find out that it's
* a Cisco 340 or 350, rather than an old Aironet card, it should use
* that in the description.
*
* Do NetBSD, DragonflyBSD, or OpenBSD support this as well? FreeBSD
* and OpenBSD let you get a description, but it's not generated by the OS,
* it's set with another ioctl that ifconfig supports; we use that to get
* a description in FreeBSD and OpenBSD, but if there is no such
* description available, it still might be nice to get some description
* string based on the device type or something such as that.
*
* In macOS, the System Configuration framework can apparently return
* names in 10.4 and later.
*
* It also appears that freedesktop.org's HAL offers an "info.product"
* string, but the HAL specification says it "should not be used in any
* UI" and "subsystem/capability specific properties" should be used
* instead and, in any case, I think HAL is being deprecated in
* favor of other stuff such as DeviceKit. DeviceKit doesn't appear
* to have any obvious product information for devices, but maybe
* I haven't looked hard enough.
*
* Using the System Configuration framework, or HAL, or DeviceKit, or
* whatever, would require that libpcap applications be linked with
* the frameworks/libraries in question. That shouldn't be a problem
* for programs linking with the shared version of libpcap (unless
* you're running on AIX - which I think is the only UN*X that doesn't
* support linking a shared library with other libraries on which it
* depends, and having an executable linked only with the first shared
* library automatically pick up the other libraries when started -
* and using HAL or whatever). Programs linked with the static
* version of libpcap would have to use pcap-config with the --static
* flag in order to get the right linker flags in order to pick up
* the additional libraries/frameworks; those programs need that anyway
* for libpcap 1.1 and beyond on Linux, as, by default, it requires
* -lnl.
*
* Do any other UN*Xes, or desktop environments support getting a
* description?
*/
static char *
#ifdef SIOCGIFDESCR
get_if_description(const char *name)
{
char *description = NULL;
int s;
struct ifreq ifrdesc;
#ifndef IFDESCRSIZE
size_t descrlen = 64;
#else
size_t descrlen = IFDESCRSIZE;
#endif /* IFDESCRSIZE */
/*
* Get the description for the interface.
*/
memset(&ifrdesc, 0, sizeof ifrdesc);
pcap_strlcpy(ifrdesc.ifr_name, name, sizeof ifrdesc.ifr_name);
s = socket(AF_INET, SOCK_DGRAM, 0);
if (s >= 0) {
#ifdef __FreeBSD__
/*
* On FreeBSD, if the buffer isn't big enough for the
* description, the ioctl succeeds, but the description
* isn't copied, ifr_buffer.length is set to the description
* length, and ifr_buffer.buffer is set to NULL.
*/
for (;;) {
free(description);
if ((description = malloc(descrlen)) != NULL) {
ifrdesc.ifr_buffer.buffer = description;
ifrdesc.ifr_buffer.length = descrlen;
if (ioctl(s, SIOCGIFDESCR, &ifrdesc) == 0) {
if (ifrdesc.ifr_buffer.buffer ==
description)
break;
else
descrlen = ifrdesc.ifr_buffer.length;
} else {
/*
* Failed to get interface description.
*/
free(description);
description = NULL;
break;
}
} else
break;
}
#else /* __FreeBSD__ */
/*
* The only other OS that currently supports
* SIOCGIFDESCR is OpenBSD, and it has no way
* to get the description length - it's clamped
* to a maximum of IFDESCRSIZE.
*/
if ((description = malloc(descrlen)) != NULL) {
ifrdesc.ifr_data = (caddr_t)description;
if (ioctl(s, SIOCGIFDESCR, &ifrdesc) != 0) {
/*
* Failed to get interface description.
*/
free(description);
description = NULL;
}
}
#endif /* __FreeBSD__ */
close(s);
if (description != NULL && description[0] == '\0') {
/*
* Description is empty, so discard it.
*/
free(description);
description = NULL;
}
}
#ifdef __FreeBSD__
/*
* For FreeBSD, if we didn't get a description, and this is
* a device with a name of the form usbusN, label it as a USB
* bus.
*/
if (description == NULL) {
if (strncmp(name, "usbus", 5) == 0) {
/*
* OK, it begins with "usbus".
*/
long busnum;
char *p;
errno = 0;
busnum = strtol(name + 5, &p, 10);
if (errno == 0 && p != name + 5 && *p == '\0' &&
busnum >= 0 && busnum <= INT_MAX) {
/*
* OK, it's a valid number that's not
* bigger than INT_MAX. Construct
* a description from it.
* (If that fails, we don't worry about
* it, we just return NULL.)
*/
if (pcap_asprintf(&description,
"USB bus number %ld", busnum) == -1) {
/* Failed. */
description = NULL;
}
}
}
}
#endif
return (description);
#else /* SIOCGIFDESCR */
get_if_description(const char *name _U_)
{
return (NULL);
#endif /* SIOCGIFDESCR */
}
/*
* Look for a given device in the specified list of devices.
*
* If we find it, return a pointer to its entry.
*
* If we don't find it, attempt to add an entry for it, with the specified
* IFF_ flags and description, and, if that succeeds, return a pointer to
* the new entry, otherwise return NULL and set errbuf to an error message.
*/
pcap_if_t *
find_or_add_if(pcap_if_list_t *devlistp, const char *name,
bpf_u_int32 if_flags, get_if_flags_func get_flags_func, char *errbuf)
{
bpf_u_int32 pcap_flags;
/*
* Convert IFF_ flags to pcap flags.
*/
pcap_flags = 0;
#ifdef IFF_LOOPBACK
if (if_flags & IFF_LOOPBACK)
pcap_flags |= PCAP_IF_LOOPBACK;
#else
/*
* We don't have IFF_LOOPBACK, so look at the device name to
* see if it looks like a loopback device.
*/
if (name[0] == 'l' && name[1] == 'o' &&
(PCAP_ISDIGIT(name[2]) || name[2] == '\0'))
pcap_flags |= PCAP_IF_LOOPBACK;
#endif
#ifdef IFF_UP
if (if_flags & IFF_UP)
pcap_flags |= PCAP_IF_UP;
#endif
#ifdef IFF_RUNNING
if (if_flags & IFF_RUNNING)
pcap_flags |= PCAP_IF_RUNNING;
#endif
/*
* Attempt to find an entry for this device; if we don't find one,
* attempt to add one.
*/
return (find_or_add_dev(devlistp, name, pcap_flags,
get_flags_func, get_if_description(name), errbuf));
}
/*
* Look for a given device in the specified list of devices.
*
* If we find it, then, if the specified address isn't null, add it to
* the list of addresses for the device and return 0.
*
* If we don't find it, attempt to add an entry for it, with the specified
* IFF_ flags and description, and, if that succeeds, add the specified
* address to its list of addresses if that address is non-null, and
* return 0, otherwise return -1 and set errbuf to an error message.
*
* (We can get called with a null address because we might get a list
* of interface name/address combinations from the underlying OS, with
* the address being absent in some cases, rather than a list of
* interfaces with each interface having a list of addresses, so this
* call may be the only call made to add to the list, and we want to
* add interfaces even if they have no addresses.)
*/
int
add_addr_to_if(pcap_if_list_t *devlistp, const char *name,
bpf_u_int32 if_flags, get_if_flags_func get_flags_func,
struct sockaddr *addr, size_t addr_size,
struct sockaddr *netmask, size_t netmask_size,
struct sockaddr *broadaddr, size_t broadaddr_size,
struct sockaddr *dstaddr, size_t dstaddr_size,
char *errbuf)
{
pcap_if_t *curdev;
/*
* Check whether the device exists and, if not, add it.
*/
curdev = find_or_add_if(devlistp, name, if_flags, get_flags_func,
errbuf);
if (curdev == NULL) {
/*
* Error - give up.
*/
return (-1);
}
if (addr == NULL) {
/*
* There's no address to add; this entry just meant
* "here's a new interface".
*/
return (0);
}
/*
* "curdev" is an entry for this interface, and we have an
* address for it; add an entry for that address to the
* interface's list of addresses.
*/
return (add_addr_to_dev(curdev, addr, addr_size, netmask,
netmask_size, broadaddr, broadaddr_size, dstaddr,
dstaddr_size, errbuf));
}
#endif /* _WIN32 */
/*
* Add an entry to the list of addresses for an interface.
* "curdev" is the entry for that interface.
*/
int
add_addr_to_dev(pcap_if_t *curdev,
struct sockaddr *addr, size_t addr_size,
struct sockaddr *netmask, size_t netmask_size,
struct sockaddr *broadaddr, size_t broadaddr_size,
struct sockaddr *dstaddr, size_t dstaddr_size,
char *errbuf)
{
pcap_addr_t *curaddr, *prevaddr, *nextaddr;
/*
* Allocate the new entry and fill it in.
*/
curaddr = (pcap_addr_t *)malloc(sizeof(pcap_addr_t));
if (curaddr == NULL) {
pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
errno, "malloc");
return (-1);
}
curaddr->next = NULL;
if (addr != NULL && addr_size != 0) {
curaddr->addr = (struct sockaddr *)dup_sockaddr(addr, addr_size);
if (curaddr->addr == NULL) {
pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
errno, "malloc");
free(curaddr);
return (-1);
}
} else
curaddr->addr = NULL;
if (netmask != NULL && netmask_size != 0) {
curaddr->netmask = (struct sockaddr *)dup_sockaddr(netmask, netmask_size);
if (curaddr->netmask == NULL) {
pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
errno, "malloc");
if (curaddr->addr != NULL)
free(curaddr->addr);
free(curaddr);
return (-1);
}
} else
curaddr->netmask = NULL;
if (broadaddr != NULL && broadaddr_size != 0) {
curaddr->broadaddr = (struct sockaddr *)dup_sockaddr(broadaddr, broadaddr_size);
if (curaddr->broadaddr == NULL) {
pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
errno, "malloc");
if (curaddr->netmask != NULL)
free(curaddr->netmask);
if (curaddr->addr != NULL)
free(curaddr->addr);
free(curaddr);
return (-1);
}
} else
curaddr->broadaddr = NULL;
if (dstaddr != NULL && dstaddr_size != 0) {
curaddr->dstaddr = (struct sockaddr *)dup_sockaddr(dstaddr, dstaddr_size);
if (curaddr->dstaddr == NULL) {
pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
errno, "malloc");
if (curaddr->broadaddr != NULL)
free(curaddr->broadaddr);
if (curaddr->netmask != NULL)
free(curaddr->netmask);
if (curaddr->addr != NULL)
free(curaddr->addr);
free(curaddr);
return (-1);
}
} else
curaddr->dstaddr = NULL;
/*
* Find the end of the list of addresses.
*/
for (prevaddr = curdev->addresses; prevaddr != NULL; prevaddr = nextaddr) {
nextaddr = prevaddr->next;
if (nextaddr == NULL) {
/*
* This is the end of the list.
*/
break;
}
}
if (prevaddr == NULL) {
/*
* The list was empty; this is the first member.
*/
curdev->addresses = curaddr;
} else {
/*
* "prevaddr" is the last member of the list; append
* this member to it.
*/
prevaddr->next = curaddr;
}
return (0);
}
/*
* Look for a given device in the specified list of devices.
*
* If we find it, return 0 and set *curdev_ret to point to it.
*
* If we don't find it, attempt to add an entry for it, with the specified
* flags and description, and, if that succeeds, return 0, otherwise
* return -1 and set errbuf to an error message.
*/
pcap_if_t *
find_or_add_dev(pcap_if_list_t *devlistp, const char *name, bpf_u_int32 flags,
get_if_flags_func get_flags_func, const char *description, char *errbuf)
{
pcap_if_t *curdev;
/*
* Is there already an entry in the list for this device?
*/
curdev = find_dev(devlistp, name);
if (curdev != NULL) {
/*
* Yes, return it.
*/
return (curdev);
}
/*
* No, we didn't find it.
*/
/*
* Try to get additional flags for the device.
*/
if ((*get_flags_func)(name, &flags, errbuf) == -1) {
/*
* Failed.
*/
return (NULL);
}
/*
* Now, try to add it to the list of devices.
*/
return (add_dev(devlistp, name, flags, description, errbuf));
}
/*
* Look for a given device in the specified list of devices, and return
* the entry for it if we find it or NULL if we don't.
*/
pcap_if_t *
find_dev(pcap_if_list_t *devlistp, const char *name)
{
pcap_if_t *curdev;
/*
* Is there an entry in the list for this device?
*/
for (curdev = devlistp->beginning; curdev != NULL;
curdev = curdev->next) {
if (strcmp(name, curdev->name) == 0) {
/*
* We found it, so, yes, there is. No need to
* add it. Provide the entry we found to our
* caller.
*/
return (curdev);
}
}
/*
* No.
*/
return (NULL);
}
/*
* Attempt to add an entry for a device, with the specified flags
* and description, and, if that succeeds, return 0 and return a pointer
* to the new entry, otherwise return NULL and set errbuf to an error
* message.
*
* If we weren't given a description, try to get one.
*/
pcap_if_t *
add_dev(pcap_if_list_t *devlistp, const char *name, bpf_u_int32 flags,
const char *description, char *errbuf)
{
pcap_if_t *curdev, *prevdev, *nextdev;
u_int this_figure_of_merit, nextdev_figure_of_merit;
curdev = malloc(sizeof(pcap_if_t));
if (curdev == NULL) {
pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
errno, "malloc");
return (NULL);
}
/*
* Fill in the entry.
*/
curdev->next = NULL;
curdev->name = strdup(name);
if (curdev->name == NULL) {
pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
errno, "malloc");
free(curdev);
return (NULL);
}
if (description == NULL) {
/*
* We weren't handed a description for the interface.
*/
curdev->description = NULL;
} else {
/*
* We were handed a description; make a copy.
*/
curdev->description = strdup(description);
if (curdev->description == NULL) {
pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
errno, "malloc");
free(curdev->name);
free(curdev);
return (NULL);
}
}
curdev->addresses = NULL; /* list starts out as empty */
curdev->flags = flags;
/*
* Add it to the list, in the appropriate location.
* First, get the "figure of merit" for this interface.
*/
this_figure_of_merit = get_figure_of_merit(curdev);
/*
* Now look for the last interface with an figure of merit
* less than or equal to the new interface's figure of merit.
*
* We start with "prevdev" being NULL, meaning we're before
* the first element in the list.
*/
prevdev = NULL;
for (;;) {
/*
* Get the interface after this one.
*/
if (prevdev == NULL) {
/*
* The next element is the first element.
*/
nextdev = devlistp->beginning;
} else
nextdev = prevdev->next;
/*
* Are we at the end of the list?
*/
if (nextdev == NULL) {
/*
* Yes - we have to put the new entry after "prevdev".
*/
break;
}
/*
* Is the new interface's figure of merit less
* than the next interface's figure of merit,
* meaning that the new interface is better
* than the next interface?
*/
nextdev_figure_of_merit = get_figure_of_merit(nextdev);
if (this_figure_of_merit < nextdev_figure_of_merit) {
/*
* Yes - we should put the new entry
* before "nextdev", i.e. after "prevdev".
*/
break;
}
prevdev = nextdev;
}
/*
* Insert before "nextdev".
*/
curdev->next = nextdev;
/*
* Insert after "prevdev" - unless "prevdev" is null,
* in which case this is the first interface.
*/
if (prevdev == NULL) {
/*
* This is the first interface. Make it
* the first element in the list of devices.
*/
devlistp->beginning = curdev;
} else
prevdev->next = curdev;
return (curdev);
}
/*
* Free a list of interfaces.
*/
void
pcap_freealldevs(pcap_if_t *alldevs)
{
pcap_if_t *curdev, *nextdev;
pcap_addr_t *curaddr, *nextaddr;
for (curdev = alldevs; curdev != NULL; curdev = nextdev) {
nextdev = curdev->next;
/*
* Free all addresses.
*/
for (curaddr = curdev->addresses; curaddr != NULL; curaddr = nextaddr) {
nextaddr = curaddr->next;
if (curaddr->addr)
free(curaddr->addr);
if (curaddr->netmask)
free(curaddr->netmask);
if (curaddr->broadaddr)
free(curaddr->broadaddr);
if (curaddr->dstaddr)
free(curaddr->dstaddr);
free(curaddr);
}
/*
* Free the name string.
*/
free(curdev->name);
/*
* Free the description string, if any.
*/
if (curdev->description != NULL)
free(curdev->description);
/*
* Free the interface.
*/
free(curdev);
}
}
/*
* pcap-npf.c has its own pcap_lookupdev(), for compatibility reasons, as
* it actually returns the names of all interfaces, with a NUL separator
* between them; some callers may depend on that.
*
* MS-DOS has its own pcap_lookupdev(), but that might be useful only
* as an optimization.
*
* In all other cases, we just use pcap_findalldevs() to get a list of
* devices, and pick from that list.
*/
#if !defined(HAVE_PACKET32) && !defined(MSDOS)
/*
* Return the name of a network interface attached to the system, or NULL
* if none can be found. The interface must be configured up; the
* lowest unit number is preferred; loopback is ignored.
*/
char *
pcap_lookupdev(char *errbuf)
{
pcap_if_t *alldevs;
#ifdef _WIN32
/*
* Windows - use the same size as the old WinPcap 3.1 code.
* XXX - this is probably bigger than it needs to be.
*/
#define IF_NAMESIZE 8192
#else
/*
* UN*X - use the system's interface name size.
* XXX - that might not be large enough for capture devices
* that aren't regular network interfaces.
*/
/* for old BSD systems, including bsdi3 */
#ifndef IF_NAMESIZE
#define IF_NAMESIZE IFNAMSIZ
#endif
#endif
static char device[IF_NAMESIZE + 1];
char *ret;
/*
* We disable this in "new API" mode, because 1) in WinPcap/Npcap,
* it may return UTF-16 strings, for backwards-compatibility
* reasons, and we're also disabling the hack to make that work,
* for not-going-past-the-end-of-a-string reasons, and 2) we
* want its behavior to be consistent.
*
* In addition, it's not thread-safe, so we've marked it as
* deprecated.
*/
if (pcap_new_api) {
snprintf(errbuf, PCAP_ERRBUF_SIZE,
"pcap_lookupdev() is deprecated and is not supported in programs calling pcap_init()");
return (NULL);
}
if (pcap_findalldevs(&alldevs, errbuf) == -1)
return (NULL);
if (alldevs == NULL || (alldevs->flags & PCAP_IF_LOOPBACK)) {
/*
* There are no devices on the list, or the first device
* on the list is a loopback device, which means there
* are no non-loopback devices on the list. This means
* we can't return any device.
*
* XXX - why not return a loopback device? If we can't
* capture on it, it won't be on the list, and if it's
* on the list, there aren't any non-loopback devices,
* so why not just supply it as the default device?
*/
(void)pcap_strlcpy(errbuf, "no suitable device found",
PCAP_ERRBUF_SIZE);
ret = NULL;
} else {
/*
* Return the name of the first device on the list.
*/
(void)pcap_strlcpy(device, alldevs->name, sizeof(device));
ret = device;
}
pcap_freealldevs(alldevs);
return (ret);
}
#endif /* !defined(HAVE_PACKET32) && !defined(MSDOS) */
#if !defined(_WIN32) && !defined(MSDOS)
/*
* We don't just fetch the entire list of devices, search for the
* particular device, and use its first IPv4 address, as that's too
* much work to get just one device's netmask.
*
* If we had an API to get attributes for a given device, we could
* use that.
*/
int
pcap_lookupnet(const char *device, bpf_u_int32 *netp, bpf_u_int32 *maskp,
char *errbuf)
{
register int fd;
register struct sockaddr_in *sin4;
struct ifreq ifr;
/*
* The pseudo-device "any" listens on all interfaces and therefore
* has the network address and -mask "0.0.0.0" therefore catching
* all traffic. Using NULL for the interface is the same as "any".
*/
if (!device || strcmp(device, "any") == 0
#ifdef HAVE_DAG_API
|| strstr(device, "dag") != NULL
#endif
#ifdef HAVE_SEPTEL_API
|| strstr(device, "septel") != NULL
#endif
#ifdef PCAP_SUPPORT_BT
|| strstr(device, "bluetooth") != NULL
#endif
#ifdef PCAP_SUPPORT_LINUX_USBMON
|| strstr(device, "usbmon") != NULL
#endif
#ifdef HAVE_SNF_API
|| strstr(device, "snf") != NULL
#endif
#ifdef PCAP_SUPPORT_NETMAP
|| strncmp(device, "netmap:", 7) == 0
|| strncmp(device, "vale", 4) == 0
#endif
#ifdef PCAP_SUPPORT_DPDK
|| strncmp(device, "dpdk:", 5) == 0
#endif
) {
*netp = *maskp = 0;
return 0;
}
fd = socket(AF_INET, SOCK_DGRAM, 0);
if (fd < 0) {
pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
errno, "socket");
return (-1);
}
memset(&ifr, 0, sizeof(ifr));
#ifdef linux
/* XXX Work around Linux kernel bug */
ifr.ifr_addr.sa_family = AF_INET;
#endif
(void)pcap_strlcpy(ifr.ifr_name, device, sizeof(ifr.ifr_name));
if (ioctl(fd, SIOCGIFADDR, (char *)&ifr) < 0) {
if (errno == EADDRNOTAVAIL) {
(void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
"%s: no IPv4 address assigned", device);
} else {
pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
errno, "SIOCGIFADDR: %s", device);
}
(void)close(fd);
return (-1);
}
sin4 = (struct sockaddr_in *)&ifr.ifr_addr;
*netp = sin4->sin_addr.s_addr;
memset(&ifr, 0, sizeof(ifr));
#ifdef linux
/* XXX Work around Linux kernel bug */
ifr.ifr_addr.sa_family = AF_INET;
#endif
(void)pcap_strlcpy(ifr.ifr_name, device, sizeof(ifr.ifr_name));
if (ioctl(fd, SIOCGIFNETMASK, (char *)&ifr) < 0) {
pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
errno, "SIOCGIFNETMASK: %s", device);
(void)close(fd);
return (-1);
}
(void)close(fd);
*maskp = sin4->sin_addr.s_addr;
if (*maskp == 0) {
if (IN_CLASSA(*netp))
*maskp = IN_CLASSA_NET;
else if (IN_CLASSB(*netp))
*maskp = IN_CLASSB_NET;
else if (IN_CLASSC(*netp))
*maskp = IN_CLASSC_NET;
else {
(void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
"inet class for 0x%x unknown", *netp);
return (-1);
}
}
*netp &= *maskp;
return (0);
}
#endif /* !defined(_WIN32) && !defined(MSDOS) */
#ifdef ENABLE_REMOTE
#include "pcap-rpcap.h"
/*
* Extract a substring from a string.
*/
static char *
get_substring(const char *p, size_t len, char *ebuf)
{
char *token;
token = malloc(len + 1);
if (token == NULL) {
pcap_fmt_errmsg_for_errno(ebuf, PCAP_ERRBUF_SIZE,
errno, "malloc");
return (NULL);
}
memcpy(token, p, len);
token[len] = '\0';
return (token);
}
/*
* Parse a capture source that might be a URL.
*
* If the source is not a URL, *schemep, *userinfop, *hostp, and *portp
* are set to NULL, *pathp is set to point to the source, and 0 is
* returned.
*
* If source is a URL, and the URL refers to a local device (a special
* case of rpcap:), *schemep, *userinfop, *hostp, and *portp are set
* to NULL, *pathp is set to point to the device name, and 0 is returned.
*
* If source is a URL, and it's not a special case that refers to a local
* device, and the parse succeeds:
*
* *schemep is set to point to an allocated string containing the scheme;
*
* if user information is present in the URL, *userinfop is set to point
* to an allocated string containing the user information, otherwise
* it's set to NULL;
*
* if host information is present in the URL, *hostp is set to point
* to an allocated string containing the host information, otherwise
* it's set to NULL;
*
* if a port number is present in the URL, *portp is set to point
* to an allocated string containing the port number, otherwise
* it's set to NULL;
*
* *pathp is set to point to an allocated string containing the
* path;
*
* and 0 is returned.
*
* If the parse fails, ebuf is set to an error string, and -1 is returned.
*/
static int
pcap_parse_source(const char *source, char **schemep, char **userinfop,
char **hostp, char **portp, char **pathp, char *ebuf)
{
char *colonp;
size_t scheme_len;
char *scheme;
const char *endp;
size_t authority_len;
char *authority;
char *parsep, *atsignp, *bracketp;
char *userinfo, *host, *port, *path;
/*
* Start out returning nothing.
*/
*schemep = NULL;
*userinfop = NULL;
*hostp = NULL;
*portp = NULL;
*pathp = NULL;
/*
* RFC 3986 says:
*
* URI = scheme ":" hier-part [ "?" query ] [ "#" fragment ]
*
* hier-part = "//" authority path-abempty
* / path-absolute
* / path-rootless
* / path-empty
*
* authority = [ userinfo "@" ] host [ ":" port ]
*
* userinfo = *( unreserved / pct-encoded / sub-delims / ":" )
*
* Step 1: look for the ":" at the end of the scheme.
* A colon in the source is *NOT* sufficient to indicate that
* this is a URL, as interface names on some platforms might
* include colons (e.g., I think some Solaris interfaces
* might).
*/
colonp = strchr(source, ':');
if (colonp == NULL) {
/*
* The source is the device to open.
* Return a NULL pointer for the scheme, user information,
* host, and port, and return the device as the path.
*/
*pathp = strdup(source);
if (*pathp == NULL) {
pcap_fmt_errmsg_for_errno(ebuf, PCAP_ERRBUF_SIZE,
errno, "malloc");
return (-1);
}
return (0);
}
/*
* All schemes must have "//" after them, i.e. we only support
* hier-part = "//" authority path-abempty, not
* hier-part = path-absolute
* hier-part = path-rootless
* hier-part = path-empty
*
* We need that in order to distinguish between a local device
* name that happens to contain a colon and a URI.
*/
if (strncmp(colonp + 1, "//", 2) != 0) {
/*
* The source is the device to open.
* Return a NULL pointer for the scheme, user information,
* host, and port, and return the device as the path.
*/
*pathp = strdup(source);
if (*pathp == NULL) {
pcap_fmt_errmsg_for_errno(ebuf, PCAP_ERRBUF_SIZE,
errno, "malloc");
return (-1);
}
return (0);
}
/*
* XXX - check whether the purported scheme could be a scheme?
*/
/*
* OK, this looks like a URL.
* Get the scheme.
*/
scheme_len = colonp - source;
scheme = malloc(scheme_len + 1);
if (scheme == NULL) {
pcap_fmt_errmsg_for_errno(ebuf, PCAP_ERRBUF_SIZE,
errno, "malloc");
return (-1);
}
memcpy(scheme, source, scheme_len);
scheme[scheme_len] = '\0';
/*
* Treat file: specially - take everything after file:// as
* the pathname.
*/
if (pcap_strcasecmp(scheme, "file") == 0) {
*pathp = strdup(colonp + 3);
if (*pathp == NULL) {
pcap_fmt_errmsg_for_errno(ebuf, PCAP_ERRBUF_SIZE,
errno, "malloc");
free(scheme);
return (-1);
}
*schemep = scheme;
return (0);
}
/*
* The WinPcap documentation says you can specify a local
* interface with "rpcap://{device}"; we special-case
* that here. If the scheme is "rpcap", and there are
* no slashes past the "//", we just return the device.
*
* XXX - %-escaping?
*/
if ((pcap_strcasecmp(scheme, "rpcap") == 0 ||
pcap_strcasecmp(scheme, "rpcaps") == 0) &&
strchr(colonp + 3, '/') == NULL) {
/*
* Local device.
*
* Return a NULL pointer for the scheme, user information,
* host, and port, and return the device as the path.
*/
free(scheme);
*pathp = strdup(colonp + 3);
if (*pathp == NULL) {
pcap_fmt_errmsg_for_errno(ebuf, PCAP_ERRBUF_SIZE,
errno, "malloc");
return (-1);
}
return (0);
}
/*
* OK, now start parsing the authority.
* Get token, terminated with / or terminated at the end of
* the string.
*/
authority_len = strcspn(colonp + 3, "/");
authority = get_substring(colonp + 3, authority_len, ebuf);
if (authority == NULL) {
/*
* Error.
*/
free(scheme);
return (-1);
}
endp = colonp + 3 + authority_len;
/*
* Now carve the authority field into its components.
*/
parsep = authority;
/*
* Is there a userinfo field?
*/
atsignp = strchr(parsep, '@');
if (atsignp != NULL) {
/*
* Yes.
*/
size_t userinfo_len;
userinfo_len = atsignp - parsep;
userinfo = get_substring(parsep, userinfo_len, ebuf);
if (userinfo == NULL) {
/*
* Error.
*/
free(authority);
free(scheme);
return (-1);
}
parsep = atsignp + 1;
} else {
/*
* No.
*/
userinfo = NULL;
}
/*
* Is there a host field?
*/
if (*parsep == '\0') {
/*
* No; there's no host field or port field.
*/
host = NULL;
port = NULL;
} else {
/*
* Yes.
*/
size_t host_len;
/*
* Is it an IP-literal?
*/
if (*parsep == '[') {
/*
* Yes.
* Treat verything up to the closing square
* bracket as the IP-Literal; we don't worry
* about whether it's a valid IPv6address or
* IPvFuture (or an IPv4address, for that
* matter, just in case we get handed a
* URL with an IPv4 IP-Literal, of the sort
* that pcap_createsrcstr() used to generate,
* and that pcap_parsesrcstr(), in the original
* WinPcap code, accepted).
*/
bracketp = strchr(parsep, ']');
if (bracketp == NULL) {
/*
* There's no closing square bracket.
*/
snprintf(ebuf, PCAP_ERRBUF_SIZE,
"IP-literal in URL doesn't end with ]");
free(userinfo);
free(authority);
free(scheme);
return (-1);
}
if (*(bracketp + 1) != '\0' &&
*(bracketp + 1) != ':') {
/*
* There's extra crud after the
* closing square bracketn.
*/
snprintf(ebuf, PCAP_ERRBUF_SIZE,
"Extra text after IP-literal in URL");
free(userinfo);
free(authority);
free(scheme);
return (-1);
}
host_len = (bracketp - 1) - parsep;
host = get_substring(parsep + 1, host_len, ebuf);
if (host == NULL) {
/*
* Error.
*/
free(userinfo);
free(authority);
free(scheme);
return (-1);
}
parsep = bracketp + 1;
} else {
/*
* No.
* Treat everything up to a : or the end of
* the string as the host.
*/
host_len = strcspn(parsep, ":");
host = get_substring(parsep, host_len, ebuf);
if (host == NULL) {
/*
* Error.
*/
free(userinfo);
free(authority);
free(scheme);
return (-1);
}
parsep = parsep + host_len;
}
/*
* Is there a port field?
*/
if (*parsep == ':') {
/*
* Yes. It's the rest of the authority field.
*/
size_t port_len;
parsep++;
port_len = strlen(parsep);
port = get_substring(parsep, port_len, ebuf);
if (port == NULL) {
/*
* Error.
*/
free(host);
free(userinfo);
free(authority);
free(scheme);
return (-1);
}
} else {
/*
* No.
*/
port = NULL;
}
}
free(authority);
/*
* Everything else is the path. Strip off the leading /.
*/
if (*endp == '\0')
path = strdup("");
else
path = strdup(endp + 1);
if (path == NULL) {
pcap_fmt_errmsg_for_errno(ebuf, PCAP_ERRBUF_SIZE,
errno, "malloc");
free(port);
free(host);
free(userinfo);
free(scheme);
return (-1);
}
*schemep = scheme;
*userinfop = userinfo;
*hostp = host;
*portp = port;
*pathp = path;
return (0);
}
int
pcap_createsrcstr_ex(char *source, int type, const char *host, const char *port,
const char *name, unsigned char uses_ssl, char *errbuf)
{
switch (type) {
case PCAP_SRC_FILE:
pcap_strlcpy(source, PCAP_SRC_FILE_STRING, PCAP_BUF_SIZE);
if (name != NULL && *name != '\0') {
pcap_strlcat(source, name, PCAP_BUF_SIZE);
return (0);
} else {
snprintf(errbuf, PCAP_ERRBUF_SIZE,
"The file name cannot be NULL.");
return (-1);
}
case PCAP_SRC_IFREMOTE:
pcap_strlcpy(source,
(uses_ssl ? "rpcaps://" : PCAP_SRC_IF_STRING),
PCAP_BUF_SIZE);
if (host != NULL && *host != '\0') {
if (strchr(host, ':') != NULL) {
/*
* The host name contains a colon, so it's
* probably an IPv6 address, and needs to
* be included in square brackets.
*/
pcap_strlcat(source, "[", PCAP_BUF_SIZE);
pcap_strlcat(source, host, PCAP_BUF_SIZE);
pcap_strlcat(source, "]", PCAP_BUF_SIZE);
} else
pcap_strlcat(source, host, PCAP_BUF_SIZE);
if (port != NULL && *port != '\0') {
pcap_strlcat(source, ":", PCAP_BUF_SIZE);
pcap_strlcat(source, port, PCAP_BUF_SIZE);
}
pcap_strlcat(source, "/", PCAP_BUF_SIZE);
} else {
snprintf(errbuf, PCAP_ERRBUF_SIZE,
"The host name cannot be NULL.");
return (-1);
}
if (name != NULL && *name != '\0')
pcap_strlcat(source, name, PCAP_BUF_SIZE);
return (0);
case PCAP_SRC_IFLOCAL:
pcap_strlcpy(source, PCAP_SRC_IF_STRING, PCAP_BUF_SIZE);
if (name != NULL && *name != '\0')
pcap_strlcat(source, name, PCAP_BUF_SIZE);
return (0);
default:
snprintf(errbuf, PCAP_ERRBUF_SIZE,
"The interface type is not valid.");
return (-1);
}
}
int
pcap_createsrcstr(char *source, int type, const char *host, const char *port,
const char *name, char *errbuf)
{
return (pcap_createsrcstr_ex(source, type, host, port, name, 0, errbuf));
}
int
pcap_parsesrcstr_ex(const char *source, int *type, char *host, char *port,
char *name, unsigned char *uses_ssl, char *errbuf)
{
char *scheme, *tmpuserinfo, *tmphost, *tmpport, *tmppath;
/* Initialization stuff */
if (host)
*host = '\0';
if (port)
*port = '\0';
if (name)
*name = '\0';
if (uses_ssl)
*uses_ssl = 0;
/* Parse the source string */
if (pcap_parse_source(source, &scheme, &tmpuserinfo, &tmphost,
&tmpport, &tmppath, errbuf) == -1) {
/*
* Fail.
*/
return (-1);
}
if (scheme == NULL) {
/*
* Local device.
*/
if (name && tmppath)
pcap_strlcpy(name, tmppath, PCAP_BUF_SIZE);
if (type)
*type = PCAP_SRC_IFLOCAL;
free(tmppath);
free(tmpport);
free(tmphost);
free(tmpuserinfo);
return (0);
}
int is_rpcap = 0;
if (strcmp(scheme, "rpcaps") == 0) {
is_rpcap = 1;
if (uses_ssl) *uses_ssl = 1;
} else if (strcmp(scheme, "rpcap") == 0) {
is_rpcap = 1;
}
if (is_rpcap) {
/*
* rpcap[s]://
*
* pcap_parse_source() has already handled the case of
* rpcap[s]://device
*/
if (host && tmphost) {
if (tmpuserinfo)
snprintf(host, PCAP_BUF_SIZE, "%s@%s",
tmpuserinfo, tmphost);
else
pcap_strlcpy(host, tmphost, PCAP_BUF_SIZE);
}
if (port && tmpport)
pcap_strlcpy(port, tmpport, PCAP_BUF_SIZE);
if (name && tmppath)
pcap_strlcpy(name, tmppath, PCAP_BUF_SIZE);
if (type)
*type = PCAP_SRC_IFREMOTE;
free(tmppath);
free(tmpport);
free(tmphost);
free(tmpuserinfo);
free(scheme);
return (0);
}
if (strcmp(scheme, "file") == 0) {
/*
* file://
*/
if (name && tmppath)
pcap_strlcpy(name, tmppath, PCAP_BUF_SIZE);
if (type)
*type = PCAP_SRC_FILE;
free(tmppath);
free(tmpport);
free(tmphost);
free(tmpuserinfo);
free(scheme);
return (0);
}
/*
* Neither rpcap: nor file:; just treat the entire string
* as a local device.
*/
if (name)
pcap_strlcpy(name, source, PCAP_BUF_SIZE);
if (type)
*type = PCAP_SRC_IFLOCAL;
free(tmppath);
free(tmpport);
free(tmphost);
free(tmpuserinfo);
free(scheme);
return (0);
}
int
pcap_parsesrcstr(const char *source, int *type, char *host, char *port,
char *name, char *errbuf)
{
return (pcap_parsesrcstr_ex(source, type, host, port, name, NULL, errbuf));
}
#endif
pcap_t *
pcap_create(const char *device, char *errbuf)
{
size_t i;
int is_theirs;
pcap_t *p;
char *device_str;
/*
* A null device name is equivalent to the "any" device -
* which might not be supported on this platform, but
* this means that you'll get a "not supported" error
* rather than, say, a crash when we try to dereference
* the null pointer.
*/
if (device == NULL)
device_str = strdup("any");
else {
#ifdef _WIN32
/*
* On Windows, for backwards compatibility reasons,
* pcap_lookupdev() returns a pointer to a sequence of
* pairs of UTF-16LE device names and local code page
* description strings.
*
* This means that if a program uses pcap_lookupdev()
* to get a default device, and hands that to an API
* that opens devices, we'll get handed a UTF-16LE
* string, not a string in the local code page.
*
* To work around that, we check whether the string
* looks as if it might be a UTF-16LE string and, if
* so, convert it back to the local code page's
* extended ASCII.
*
* We disable that check in "new API" mode, because:
*
* 1) You *cannot* reliably detect whether a
* string is UTF-16LE or not; "a" could either
* be a one-character ASCII string or the first
* character of a UTF-16LE string.
*
* 2) Doing that test can run past the end of
* the string, if it's a 1-character ASCII
* string
*
* This particular version of this heuristic dates
* back to WinPcap 4.1.1; PacketOpenAdapter() does
* uses the same heuristic, with the exact same
* vulnerability.
*
* That's why we disable this in "new API" mode.
* We keep it around in legacy mode for backwards
* compatibility.
*/
if (!pcap_new_api && device[0] != '\0' && device[1] == '\0') {
size_t length;
length = wcslen((wchar_t *)device);
device_str = (char *)malloc(length + 1);
if (device_str == NULL) {
pcap_fmt_errmsg_for_errno(errbuf,
PCAP_ERRBUF_SIZE, errno,
"malloc");
return (NULL);
}
snprintf(device_str, length + 1, "%ws",
(const wchar_t *)device);
} else
#endif
device_str = strdup(device);
}
if (device_str == NULL) {
pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE,
errno, "malloc");
return (NULL);
}
/*
* Try each of the non-local-network-interface capture
* source types until we find one that works for this
* device or run out of types.
*/
for (i = 0; capture_source_types[i].create_op != NULL; i++) {
is_theirs = 0;
p = capture_source_types[i].create_op(device_str, errbuf,
&is_theirs);
if (is_theirs) {
/*
* The device name refers to a device of the
* type in question; either it succeeded,
* in which case p refers to a pcap_t to
* later activate for the device, or it
* failed, in which case p is null and we
* should return that to report the failure
* to create.
*/
if (p == NULL) {
/*
* We assume the caller filled in errbuf.
*/
free(device_str);
return (NULL);
}
p->opt.device = device_str;
return (p);
}
}
/*
* OK, try it as a regular network interface.
*/
p = pcap_create_interface(device_str, errbuf);
if (p == NULL) {
/*
* We assume the caller filled in errbuf.
*/
free(device_str);
return (NULL);
}
p->opt.device = device_str;
return (p);
}
/*
* Set nonblocking mode on an unactivated pcap_t; this sets a flag
* checked by pcap_activate(), which sets the mode after calling
* the activate routine.
*/
static int
pcap_setnonblock_unactivated(pcap_t *p, int nonblock)
{
p->opt.nonblock = nonblock;
return (0);
}
static void
initialize_ops(pcap_t *p)
{
/*
* Set operation pointers for operations that only work on
* an activated pcap_t to point to a routine that returns
* a "this isn't activated" error.
*/
p->read_op = pcap_read_not_initialized;
p->inject_op = pcap_inject_not_initialized;
p->setfilter_op = pcap_setfilter_not_initialized;
p->setdirection_op = pcap_setdirection_not_initialized;
p->set_datalink_op = pcap_set_datalink_not_initialized;
p->getnonblock_op = pcap_getnonblock_not_initialized;
p->stats_op = pcap_stats_not_initialized;
#ifdef _WIN32
p->stats_ex_op = pcap_stats_ex_not_initialized;
p->setbuff_op = pcap_setbuff_not_initialized;
p->setmode_op = pcap_setmode_not_initialized;
p->setmintocopy_op = pcap_setmintocopy_not_initialized;
p->getevent_op = pcap_getevent_not_initialized;
p->oid_get_request_op = pcap_oid_get_request_not_initialized;
p->oid_set_request_op = pcap_oid_set_request_not_initialized;
p->sendqueue_transmit_op = pcap_sendqueue_transmit_not_initialized;
p->setuserbuffer_op = pcap_setuserbuffer_not_initialized;
p->live_dump_op = pcap_live_dump_not_initialized;
p->live_dump_ended_op = pcap_live_dump_ended_not_initialized;
p->get_airpcap_handle_op = pcap_get_airpcap_handle_not_initialized;
#endif
/*
* Default cleanup operation - implementations can override
* this, but should call pcap_cleanup_live_common() after
* doing their own additional cleanup.
*/
p->cleanup_op = pcap_cleanup_live_common;
/*
* In most cases, the standard one-shot callback can
* be used for pcap_next()/pcap_next_ex().
*/
p->oneshot_callback = pcap_oneshot;
/*
* Default breakloop operation - implementations can override
* this, but should call pcap_breakloop_common() before doing
* their own logic.
*/
p->breakloop_op = pcap_breakloop_common;
}
static pcap_t *
pcap_alloc_pcap_t(char *ebuf, size_t total_size, size_t private_offset)
{
char *chunk;
pcap_t *p;
/*
* total_size is the size of a structure containing a pcap_t
* followed by a private structure.
*/
chunk = calloc(total_size, 1);
if (chunk == NULL) {
pcap_fmt_errmsg_for_errno(ebuf, PCAP_ERRBUF_SIZE,
errno, "malloc");
return (NULL);
}
/*
* Get a pointer to the pcap_t at the beginning.
*/
p = (pcap_t *)chunk;
#ifdef _WIN32
p->handle = INVALID_HANDLE_VALUE; /* not opened yet */
#else /* _WIN32 */
p->fd = -1; /* not opened yet */
#ifndef MSDOS
p->selectable_fd = -1;
p->required_select_timeout = NULL;
#endif /* MSDOS */
#endif /* _WIN32 */
/*
* private_offset is the offset, in bytes, of the private
* data from the beginning of the structure.
*
* Set the pointer to the private data; that's private_offset
* bytes past the pcap_t.
*/
p->priv = (void *)(chunk + private_offset);
return (p);
}
pcap_t *
pcap_create_common(char *ebuf, size_t total_size, size_t private_offset)
{
pcap_t *p;
p = pcap_alloc_pcap_t(ebuf, total_size, private_offset);
if (p == NULL)
return (NULL);
/*
* Default to "can't set rfmon mode"; if it's supported by
* a platform, the create routine that called us can set
* the op to its routine to check whether a particular
* device supports it.
*/
p->can_set_rfmon_op = pcap_cant_set_rfmon;
/*
* If pcap_setnonblock() is called on a not-yet-activated
* pcap_t, default to setting a flag and turning
* on non-blocking mode when activated.
*/
p->setnonblock_op = pcap_setnonblock_unactivated;
initialize_ops(p);
/* put in some defaults*/
p->snapshot = 0; /* max packet size unspecified */
p->opt.timeout = 0; /* no timeout specified */
p->opt.buffer_size = 0; /* use the platform's default */
p->opt.promisc = 0;
p->opt.rfmon = 0;
p->opt.immediate = 0;
p->opt.tstamp_type = -1; /* default to not setting time stamp type */
p->opt.tstamp_precision = PCAP_TSTAMP_PRECISION_MICRO;
/*
* Platform-dependent options.
*/
#ifdef __linux__
p->opt.protocol = 0;
#endif
#ifdef _WIN32
p->opt.nocapture_local = 0;
#endif
/*
* Start out with no BPF code generation flags set.
*/
p->bpf_codegen_flags = 0;
return (p);
}
int
pcap_check_activated(pcap_t *p)
{
if (p->activated) {
snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "can't perform "
" operation on activated capture");
return (-1);
}
return (0);
}
int
pcap_set_snaplen(pcap_t *p, int snaplen)
{
if (pcap_check_activated(p))
return (PCAP_ERROR_ACTIVATED);
p->snapshot = snaplen;
return (0);
}
int
pcap_set_promisc(pcap_t *p, int promisc)
{
if (pcap_check_activated(p))
return (PCAP_ERROR_ACTIVATED);
p->opt.promisc = promisc;
return (0);
}
int
pcap_set_rfmon(pcap_t *p, int rfmon)
{
if (pcap_check_activated(p))
return (PCAP_ERROR_ACTIVATED);
p->opt.rfmon = rfmon;
return (0);
}
int
pcap_set_timeout(pcap_t *p, int timeout_ms)
{
if (pcap_check_activated(p))
return (PCAP_ERROR_ACTIVATED);
p->opt.timeout = timeout_ms;
return (0);
}
int
pcap_set_tstamp_type(pcap_t *p, int tstamp_type)
{
int i;
if (pcap_check_activated(p))
return (PCAP_ERROR_ACTIVATED);
/*
* The argument should have been u_int, but that's too late
* to change now - it's an API.
*/
if (tstamp_type < 0)
return (PCAP_WARNING_TSTAMP_TYPE_NOTSUP);
/*
* If p->tstamp_type_count is 0, we only support PCAP_TSTAMP_HOST;
* the default time stamp type is PCAP_TSTAMP_HOST.
*/
if (p->tstamp_type_count == 0) {
if (tstamp_type == PCAP_TSTAMP_HOST) {
p->opt.tstamp_type = tstamp_type;
return (0);
}
} else {
/*
* Check whether we claim to support this type of time stamp.
*/
for (i = 0; i < p->tstamp_type_count; i++) {
if (p->tstamp_type_list[i] == (u_int)tstamp_type) {
/*
* Yes.
*/
p->opt.tstamp_type = tstamp_type;
return (0);
}
}
}
/*
* We don't support this type of time stamp.
*/
return (PCAP_WARNING_TSTAMP_TYPE_NOTSUP);
}
int
pcap_set_immediate_mode(pcap_t *p, int immediate)
{
if (pcap_check_activated(p))
return (PCAP_ERROR_ACTIVATED);
p->opt.immediate = immediate;
return (0);
}
int
pcap_set_buffer_size(pcap_t *p, int buffer_size)
{
if (pcap_check_activated(p))
return (PCAP_ERROR_ACTIVATED);
if (buffer_size <= 0) {
/*
* Silently ignore invalid values.
*/
return (0);
}
p->opt.buffer_size = buffer_size;
return (0);
}
int
pcap_set_tstamp_precision(pcap_t *p, int tstamp_precision)
{
int i;
if (pcap_check_activated(p))
return (PCAP_ERROR_ACTIVATED);
/*
* The argument should have been u_int, but that's too late
* to change now - it's an API.
*/
if (tstamp_precision < 0)
return (PCAP_ERROR_TSTAMP_PRECISION_NOTSUP);
/*
* If p->tstamp_precision_count is 0, we only support setting
* the time stamp precision to microsecond precision; every
* pcap module *MUST* support microsecond precision, even if
* it does so by converting the native precision to
* microseconds.
*/
if (p->tstamp_precision_count == 0) {
if (tstamp_precision == PCAP_TSTAMP_PRECISION_MICRO) {
p->opt.tstamp_precision = tstamp_precision;
return (0);
}
} else {
/*
* Check whether we claim to support this precision of
* time stamp.
*/
for (i = 0; i < p->tstamp_precision_count; i++) {
if (p->tstamp_precision_list[i] == (u_int)tstamp_precision) {
/*
* Yes.
*/
p->opt.tstamp_precision = tstamp_precision;
return (0);
}
}
}
/*
* We don't support this time stamp precision.
*/
return (PCAP_ERROR_TSTAMP_PRECISION_NOTSUP);
}
int
pcap_get_tstamp_precision(pcap_t *p)
{
return (p->opt.tstamp_precision);
}
int
pcap_activate(pcap_t *p)
{
int status;
/*
* Catch attempts to re-activate an already-activated
* pcap_t; this should, for example, catch code that
* calls pcap_open_live() followed by pcap_activate(),
* as some code that showed up in a Stack Exchange
* question did.
*/
if (pcap_check_activated(p))
return (PCAP_ERROR_ACTIVATED);
status = p->activate_op(p);
if (status >= 0) {
/*
* If somebody requested non-blocking mode before
* calling pcap_activate(), turn it on now.
*/
if (p->opt.nonblock) {
status = p->setnonblock_op(p, 1);
if (status < 0) {
/*
* Failed. Undo everything done by
* the activate operation.
*/
p->cleanup_op(p);
initialize_ops(p);
return (status);
}
}
p->activated = 1;
} else {
if (p->errbuf[0] == '\0') {
/*
* No error message supplied by the activate routine;
* for the benefit of programs that don't specially
* handle errors other than PCAP_ERROR, return the
* error message corresponding to the status.
*/
snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "%s",
pcap_statustostr(status));
}
/*
* Undo any operation pointer setting, etc. done by
* the activate operation.
*/
initialize_ops(p);
}
return (status);
}
pcap_t *
pcap_open_live(const char *device, int snaplen, int promisc, int to_ms, char *errbuf)
{
pcap_t *p;
int status;
#ifdef ENABLE_REMOTE
char host[PCAP_BUF_SIZE + 1];
char port[PCAP_BUF_SIZE + 1];
char name[PCAP_BUF_SIZE + 1];
int srctype;
/*
* A null device name is equivalent to the "any" device -
* which might not be supported on this platform, but
* this means that you'll get a "not supported" error
* rather than, say, a crash when we try to dereference
* the null pointer.
*/
if (device == NULL)
device = "any";
/*
* Retrofit - we have to make older applications compatible with
* remote capture.
* So we're calling pcap_open_remote() from here; this is a very
* dirty hack.
* Obviously, we cannot exploit all the new features; for instance,
* we cannot send authentication, we cannot use a UDP data connection,
* and so on.
*/
if (pcap_parsesrcstr(device, &srctype, host, port, name, errbuf))
return (NULL);
if (srctype == PCAP_SRC_IFREMOTE) {
/*
* Although we already have host, port and iface, we prefer
* to pass only 'device' to pcap_open_rpcap(), so that it has
* to call pcap_parsesrcstr() again.
* This is less optimized, but much clearer.
*/
return (pcap_open_rpcap(device, snaplen,
promisc ? PCAP_OPENFLAG_PROMISCUOUS : 0, to_ms,
NULL, errbuf));
}
if (srctype == PCAP_SRC_FILE) {
snprintf(errbuf, PCAP_ERRBUF_SIZE, "unknown URL scheme \"file\"");
return (NULL);
}
if (srctype == PCAP_SRC_IFLOCAL) {
/*
* If it starts with rpcap://, that refers to a local device
* (no host part in the URL). Remove the rpcap://, and
* fall through to the regular open path.
*/
if (strncmp(device, PCAP_SRC_IF_STRING, strlen(PCAP_SRC_IF_STRING)) == 0) {
size_t len = strlen(device) - strlen(PCAP_SRC_IF_STRING) + 1;
if (len > 0)
device += strlen(PCAP_SRC_IF_STRING);
}
}
#endif /* ENABLE_REMOTE */
p = pcap_create(device, errbuf);
if (p == NULL)
return (NULL);
status = pcap_set_snaplen(p, snaplen);
if (status < 0)
goto fail;
status = pcap_set_promisc(p, promisc);
if (status < 0)
goto fail;
status = pcap_set_timeout(p, to_ms);
if (status < 0)
goto fail;
/*
* Mark this as opened with pcap_open_live(), so that, for
* example, we show the full list of DLT_ values, rather
* than just the ones that are compatible with capturing
* when not in monitor mode. That allows existing applications
* to work the way they used to work, but allows new applications
* that know about the new open API to, for example, find out the
* DLT_ values that they can select without changing whether
* the adapter is in monitor mode or not.
*/
p->oldstyle = 1;
status = pcap_activate(p);
if (status < 0)
goto fail;
return (p);
fail:
if (status == PCAP_ERROR)
snprintf(errbuf, PCAP_ERRBUF_SIZE, "%s: %.*s", device,
PCAP_ERRBUF_SIZE - 3, p->errbuf);
else if (status == PCAP_ERROR_NO_SUCH_DEVICE ||
status == PCAP_ERROR_PERM_DENIED ||
status == PCAP_ERROR_PROMISC_PERM_DENIED)
snprintf(errbuf, PCAP_ERRBUF_SIZE, "%s: %s (%.*s)", device,
pcap_statustostr(status), PCAP_ERRBUF_SIZE - 6, p->errbuf);
else
snprintf(errbuf, PCAP_ERRBUF_SIZE, "%s: %s", device,
pcap_statustostr(status));
pcap_close(p);
return (NULL);
}
pcap_t *
pcap_open_offline_common(char *ebuf, size_t total_size, size_t private_offset)
{
pcap_t *p;
p = pcap_alloc_pcap_t(ebuf, total_size, private_offset);
if (p == NULL)
return (NULL);
p->opt.tstamp_precision = PCAP_TSTAMP_PRECISION_MICRO;
return (p);
}
int
pcap_dispatch(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
{
return (p->read_op(p, cnt, callback, user));
}
int
pcap_loop(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
{
register int n;
for (;;) {
if (p->rfile != NULL) {
/*
* 0 means EOF, so don't loop if we get 0.
*/
n = pcap_offline_read(p, cnt, callback, user);
} else {
/*
* XXX keep reading until we get something
* (or an error occurs)
*/
do {
n = p->read_op(p, cnt, callback, user);
} while (n == 0);
}
if (n <= 0)
return (n);
if (!PACKET_COUNT_IS_UNLIMITED(cnt)) {
cnt -= n;
if (cnt <= 0)
return (0);
}
}
}
/*
* Force the loop in "pcap_read()" or "pcap_read_offline()" to terminate.
*/
void
pcap_breakloop(pcap_t *p)
{
p->breakloop_op(p);
}
int
pcap_datalink(pcap_t *p)
{
if (!p->activated)
return (PCAP_ERROR_NOT_ACTIVATED);
return (p->linktype);
}
int
pcap_datalink_ext(pcap_t *p)
{
if (!p->activated)
return (PCAP_ERROR_NOT_ACTIVATED);
return (p->linktype_ext);
}
int
pcap_list_datalinks(pcap_t *p, int **dlt_buffer)
{
if (!p->activated)
return (PCAP_ERROR_NOT_ACTIVATED);
if (p->dlt_count == 0) {
/*
* We couldn't fetch the list of DLTs, which means
* this platform doesn't support changing the
* DLT for an interface. Return a list of DLTs
* containing only the DLT this device supports.
*/
*dlt_buffer = (int*)malloc(sizeof(**dlt_buffer));
if (*dlt_buffer == NULL) {
pcap_fmt_errmsg_for_errno(p->errbuf, sizeof(p->errbuf),
errno, "malloc");
return (PCAP_ERROR);
}
**dlt_buffer = p->linktype;
return (1);
} else {
*dlt_buffer = (int*)calloc(sizeof(**dlt_buffer), p->dlt_count);
if (*dlt_buffer == NULL) {
pcap_fmt_errmsg_for_errno(p->errbuf, sizeof(p->errbuf),
errno, "malloc");
return (PCAP_ERROR);
}
(void)memcpy(*dlt_buffer, p->dlt_list,
sizeof(**dlt_buffer) * p->dlt_count);
return (p->dlt_count);
}
}
/*
* In Windows, you might have a library built with one version of the
* C runtime library and an application built with another version of
* the C runtime library, which means that the library might use one
* version of malloc() and free() and the application might use another
* version of malloc() and free(). If so, that means something
* allocated by the library cannot be freed by the application, so we
* need to have a pcap_free_datalinks() routine to free up the list
* allocated by pcap_list_datalinks(), even though it's just a wrapper
* around free().
*/
void
pcap_free_datalinks(int *dlt_list)
{
free(dlt_list);
}
int
pcap_set_datalink(pcap_t *p, int dlt)
{
int i;
const char *dlt_name;
if (dlt < 0)
goto unsupported;
if (p->dlt_count == 0 || p->set_datalink_op == NULL) {
/*
* We couldn't fetch the list of DLTs, or we don't
* have a "set datalink" operation, which means
* this platform doesn't support changing the
* DLT for an interface. Check whether the new
* DLT is the one this interface supports.
*/
if (p->linktype != dlt)
goto unsupported;
/*
* It is, so there's nothing we need to do here.
*/
return (0);
}
for (i = 0; i < p->dlt_count; i++)
if (p->dlt_list[i] == (u_int)dlt)
break;
if (i >= p->dlt_count)
goto unsupported;
if (p->dlt_count == 2 && p->dlt_list[0] == DLT_EN10MB &&
dlt == DLT_DOCSIS) {
/*
* This is presumably an Ethernet device, as the first
* link-layer type it offers is DLT_EN10MB, and the only
* other type it offers is DLT_DOCSIS. That means that
* we can't tell the driver to supply DOCSIS link-layer
* headers - we're just pretending that's what we're
* getting, as, presumably, we're capturing on a dedicated
* link to a Cisco Cable Modem Termination System, and
* it's putting raw DOCSIS frames on the wire inside low-level
* Ethernet framing.
*/
p->linktype = dlt;
return (0);
}
if (p->set_datalink_op(p, dlt) == -1)
return (-1);
p->linktype = dlt;
return (0);
unsupported:
dlt_name = pcap_datalink_val_to_name(dlt);
if (dlt_name != NULL) {
(void) snprintf(p->errbuf, sizeof(p->errbuf),
"%s is not one of the DLTs supported by this device",
dlt_name);
} else {
(void) snprintf(p->errbuf, sizeof(p->errbuf),
"DLT %d is not one of the DLTs supported by this device",
dlt);
}
return (-1);
}
/*
* This array is designed for mapping upper and lower case letter
* together for a case independent comparison. The mappings are
* based upon ascii character sequences.
*/
static const u_char charmap[] = {
(u_char)'\000', (u_char)'\001', (u_char)'\002', (u_char)'\003',
(u_char)'\004', (u_char)'\005', (u_char)'\006', (u_char)'\007',
(u_char)'\010', (u_char)'\011', (u_char)'\012', (u_char)'\013',
(u_char)'\014', (u_char)'\015', (u_char)'\016', (u_char)'\017',
(u_char)'\020', (u_char)'\021', (u_char)'\022', (u_char)'\023',
(u_char)'\024', (u_char)'\025', (u_char)'\026', (u_char)'\027',
(u_char)'\030', (u_char)'\031', (u_char)'\032', (u_char)'\033',
(u_char)'\034', (u_char)'\035', (u_char)'\036', (u_char)'\037',
(u_char)'\040', (u_char)'\041', (u_char)'\042', (u_char)'\043',
(u_char)'\044', (u_char)'\045', (u_char)'\046', (u_char)'\047',
(u_char)'\050', (u_char)'\051', (u_char)'\052', (u_char)'\053',
(u_char)'\054', (u_char)'\055', (u_char)'\056', (u_char)'\057',
(u_char)'\060', (u_char)'\061', (u_char)'\062', (u_char)'\063',
(u_char)'\064', (u_char)'\065', (u_char)'\066', (u_char)'\067',
(u_char)'\070', (u_char)'\071', (u_char)'\072', (u_char)'\073',
(u_char)'\074', (u_char)'\075', (u_char)'\076', (u_char)'\077',
(u_char)'\100', (u_char)'\141', (u_char)'\142', (u_char)'\143',
(u_char)'\144', (u_char)'\145', (u_char)'\146', (u_char)'\147',
(u_char)'\150', (u_char)'\151', (u_char)'\152', (u_char)'\153',
(u_char)'\154', (u_char)'\155', (u_char)'\156', (u_char)'\157',
(u_char)'\160', (u_char)'\161', (u_char)'\162', (u_char)'\163',
(u_char)'\164', (u_char)'\165', (u_char)'\166', (u_char)'\167',
(u_char)'\170', (u_char)'\171', (u_char)'\172', (u_char)'\133',
(u_char)'\134', (u_char)'\135', (u_char)'\136', (u_char)'\137',
(u_char)'\140', (u_char)'\141', (u_char)'\142', (u_char)'\143',
(u_char)'\144', (u_char)'\145', (u_char)'\146', (u_char)'\147',
(u_char)'\150', (u_char)'\151', (u_char)'\152', (u_char)'\153',
(u_char)'\154', (u_char)'\155', (u_char)'\156', (u_char)'\157',
(u_char)'\160', (u_char)'\161', (u_char)'\162', (u_char)'\163',
(u_char)'\164', (u_char)'\165', (u_char)'\166', (u_char)'\167',
(u_char)'\170', (u_char)'\171', (u_char)'\172', (u_char)'\173',
(u_char)'\174', (u_char)'\175', (u_char)'\176', (u_char)'\177',
(u_char)'\200', (u_char)'\201', (u_char)'\202', (u_char)'\203',
(u_char)'\204', (u_char)'\205', (u_char)'\206', (u_char)'\207',
(u_char)'\210', (u_char)'\211', (u_char)'\212', (u_char)'\213',
(u_char)'\214', (u_char)'\215', (u_char)'\216', (u_char)'\217',
(u_char)'\220', (u_char)'\221', (u_char)'\222', (u_char)'\223',
(u_char)'\224', (u_char)'\225', (u_char)'\226', (u_char)'\227',
(u_char)'\230', (u_char)'\231', (u_char)'\232', (u_char)'\233',
(u_char)'\234', (u_char)'\235', (u_char)'\236', (u_char)'\237',
(u_char)'\240', (u_char)'\241', (u_char)'\242', (u_char)'\243',
(u_char)'\244', (u_char)'\245', (u_char)'\246', (u_char)'\247',
(u_char)'\250', (u_char)'\251', (u_char)'\252', (u_char)'\253',
(u_char)'\254', (u_char)'\255', (u_char)'\256', (u_char)'\257',
(u_char)'\260', (u_char)'\261', (u_char)'\262', (u_char)'\263',
(u_char)'\264', (u_char)'\265', (u_char)'\266', (u_char)'\267',
(u_char)'\270', (u_char)'\271', (u_char)'\272', (u_char)'\273',
(u_char)'\274', (u_char)'\275', (u_char)'\276', (u_char)'\277',
(u_char)'\300', (u_char)'\341', (u_char)'\342', (u_char)'\343',
(u_char)'\344', (u_char)'\345', (u_char)'\346', (u_char)'\347',
(u_char)'\350', (u_char)'\351', (u_char)'\352', (u_char)'\353',
(u_char)'\354', (u_char)'\355', (u_char)'\356', (u_char)'\357',
(u_char)'\360', (u_char)'\361', (u_char)'\362', (u_char)'\363',
(u_char)'\364', (u_char)'\365', (u_char)'\366', (u_char)'\367',
(u_char)'\370', (u_char)'\371', (u_char)'\372', (u_char)'\333',
(u_char)'\334', (u_char)'\335', (u_char)'\336', (u_char)'\337',
(u_char)'\340', (u_char)'\341', (u_char)'\342', (u_char)'\343',
(u_char)'\344', (u_char)'\345', (u_char)'\346', (u_char)'\347',
(u_char)'\350', (u_char)'\351', (u_char)'\352', (u_char)'\353',
(u_char)'\354', (u_char)'\355', (u_char)'\356', (u_char)'\357',
(u_char)'\360', (u_char)'\361', (u_char)'\362', (u_char)'\363',
(u_char)'\364', (u_char)'\365', (u_char)'\366', (u_char)'\367',
(u_char)'\370', (u_char)'\371', (u_char)'\372', (u_char)'\373',
(u_char)'\374', (u_char)'\375', (u_char)'\376', (u_char)'\377',
};
int
pcap_strcasecmp(const char *s1, const char *s2)
{
register const u_char *cm = charmap,
*us1 = (const u_char *)s1,
*us2 = (const u_char *)s2;
while (cm[*us1] == cm[*us2++])
if (*us1++ == '\0')
return(0);
return (cm[*us1] - cm[*--us2]);
}
struct dlt_choice {
const char *name;
const char *description;
int dlt;
};
#define DLT_CHOICE(code, description) { #code, description, DLT_ ## code }
#define DLT_CHOICE_SENTINEL { NULL, NULL, 0 }
static struct dlt_choice dlt_choices[] = {
DLT_CHOICE(NULL, "BSD loopback"),
DLT_CHOICE(EN10MB, "Ethernet"),
DLT_CHOICE(IEEE802, "Token ring"),
DLT_CHOICE(ARCNET, "BSD ARCNET"),
DLT_CHOICE(SLIP, "SLIP"),
DLT_CHOICE(PPP, "PPP"),
DLT_CHOICE(FDDI, "FDDI"),
DLT_CHOICE(ATM_RFC1483, "RFC 1483 LLC-encapsulated ATM"),
DLT_CHOICE(RAW, "Raw IP"),
DLT_CHOICE(SLIP_BSDOS, "BSD/OS SLIP"),
DLT_CHOICE(PPP_BSDOS, "BSD/OS PPP"),
DLT_CHOICE(ATM_CLIP, "Linux Classical IP over ATM"),
DLT_CHOICE(PPP_SERIAL, "PPP over serial"),
DLT_CHOICE(PPP_ETHER, "PPPoE"),
DLT_CHOICE(SYMANTEC_FIREWALL, "Symantec Firewall"),
DLT_CHOICE(C_HDLC, "Cisco HDLC"),
DLT_CHOICE(IEEE802_11, "802.11"),
DLT_CHOICE(FRELAY, "Frame Relay"),
DLT_CHOICE(LOOP, "OpenBSD loopback"),
DLT_CHOICE(ENC, "OpenBSD encapsulated IP"),
DLT_CHOICE(LINUX_SLL, "Linux cooked v1"),
DLT_CHOICE(LTALK, "Localtalk"),
DLT_CHOICE(PFLOG, "OpenBSD pflog file"),
DLT_CHOICE(PFSYNC, "Packet filter state syncing"),
DLT_CHOICE(PRISM_HEADER, "802.11 plus Prism header"),
DLT_CHOICE(IP_OVER_FC, "RFC 2625 IP-over-Fibre Channel"),
DLT_CHOICE(SUNATM, "Sun raw ATM"),
DLT_CHOICE(IEEE802_11_RADIO, "802.11 plus radiotap header"),
DLT_CHOICE(ARCNET_LINUX, "Linux ARCNET"),
DLT_CHOICE(JUNIPER_MLPPP, "Juniper Multi-Link PPP"),
DLT_CHOICE(JUNIPER_MLFR, "Juniper Multi-Link Frame Relay"),
DLT_CHOICE(JUNIPER_ES, "Juniper Encryption Services PIC"),
DLT_CHOICE(JUNIPER_GGSN, "Juniper GGSN PIC"),
DLT_CHOICE(JUNIPER_MFR, "Juniper FRF.16 Frame Relay"),
DLT_CHOICE(JUNIPER_ATM2, "Juniper ATM2 PIC"),
DLT_CHOICE(JUNIPER_SERVICES, "Juniper Advanced Services PIC"),
DLT_CHOICE(JUNIPER_ATM1, "Juniper ATM1 PIC"),
DLT_CHOICE(APPLE_IP_OVER_IEEE1394, "Apple IP-over-IEEE 1394"),
DLT_CHOICE(MTP2_WITH_PHDR, "SS7 MTP2 with Pseudo-header"),
DLT_CHOICE(MTP2, "SS7 MTP2"),
DLT_CHOICE(MTP3, "SS7 MTP3"),
DLT_CHOICE(SCCP, "SS7 SCCP"),
DLT_CHOICE(DOCSIS, "DOCSIS"),
DLT_CHOICE(LINUX_IRDA, "Linux IrDA"),
DLT_CHOICE(IEEE802_11_RADIO_AVS, "802.11 plus AVS radio information header"),
DLT_CHOICE(JUNIPER_MONITOR, "Juniper Passive Monitor PIC"),
DLT_CHOICE(BACNET_MS_TP, "BACnet MS/TP"),
DLT_CHOICE(PPP_PPPD, "PPP for pppd, with direction flag"),
DLT_CHOICE(JUNIPER_PPPOE, "Juniper PPPoE"),
DLT_CHOICE(JUNIPER_PPPOE_ATM, "Juniper PPPoE/ATM"),
DLT_CHOICE(GPRS_LLC, "GPRS LLC"),
DLT_CHOICE(GPF_T, "GPF-T"),
DLT_CHOICE(GPF_F, "GPF-F"),
DLT_CHOICE(JUNIPER_PIC_PEER, "Juniper PIC Peer"),
DLT_CHOICE(ERF_ETH, "Ethernet with Endace ERF header"),
DLT_CHOICE(ERF_POS, "Packet-over-SONET with Endace ERF header"),
DLT_CHOICE(LINUX_LAPD, "Linux vISDN LAPD"),
DLT_CHOICE(JUNIPER_ETHER, "Juniper Ethernet"),
DLT_CHOICE(JUNIPER_PPP, "Juniper PPP"),
DLT_CHOICE(JUNIPER_FRELAY, "Juniper Frame Relay"),
DLT_CHOICE(JUNIPER_CHDLC, "Juniper C-HDLC"),
DLT_CHOICE(MFR, "FRF.16 Frame Relay"),
DLT_CHOICE(JUNIPER_VP, "Juniper Voice PIC"),
DLT_CHOICE(A429, "Arinc 429"),
DLT_CHOICE(A653_ICM, "Arinc 653 Interpartition Communication"),
DLT_CHOICE(USB_FREEBSD, "USB with FreeBSD header"),
DLT_CHOICE(BLUETOOTH_HCI_H4, "Bluetooth HCI UART transport layer"),
DLT_CHOICE(IEEE802_16_MAC_CPS, "IEEE 802.16 MAC Common Part Sublayer"),
DLT_CHOICE(USB_LINUX, "USB with Linux header"),
DLT_CHOICE(CAN20B, "Controller Area Network (CAN) v. 2.0B"),
DLT_CHOICE(IEEE802_15_4_LINUX, "IEEE 802.15.4 with Linux padding"),
DLT_CHOICE(PPI, "Per-Packet Information"),
DLT_CHOICE(IEEE802_16_MAC_CPS_RADIO, "IEEE 802.16 MAC Common Part Sublayer plus radiotap header"),
DLT_CHOICE(JUNIPER_ISM, "Juniper Integrated Service Module"),
DLT_CHOICE(IEEE802_15_4, "IEEE 802.15.4 with FCS"),
DLT_CHOICE(SITA, "SITA pseudo-header"),
DLT_CHOICE(ERF, "Endace ERF header"),
DLT_CHOICE(RAIF1, "Ethernet with u10 Networks pseudo-header"),
DLT_CHOICE(IPMB_KONTRON, "IPMB with Kontron pseudo-header"),
DLT_CHOICE(JUNIPER_ST, "Juniper Secure Tunnel"),
DLT_CHOICE(BLUETOOTH_HCI_H4_WITH_PHDR, "Bluetooth HCI UART transport layer plus pseudo-header"),
DLT_CHOICE(AX25_KISS, "AX.25 with KISS header"),
DLT_CHOICE(IPMB_LINUX, "IPMB with Linux/Pigeon Point pseudo-header"),
DLT_CHOICE(IEEE802_15_4_NONASK_PHY, "IEEE 802.15.4 with non-ASK PHY data"),
DLT_CHOICE(MPLS, "MPLS with label as link-layer header"),
DLT_CHOICE(LINUX_EVDEV, "Linux evdev events"),
DLT_CHOICE(USB_LINUX_MMAPPED, "USB with padded Linux header"),
DLT_CHOICE(DECT, "DECT"),
DLT_CHOICE(AOS, "AOS Space Data Link protocol"),
DLT_CHOICE(WIHART, "Wireless HART"),
DLT_CHOICE(FC_2, "Fibre Channel FC-2"),
DLT_CHOICE(FC_2_WITH_FRAME_DELIMS, "Fibre Channel FC-2 with frame delimiters"),
DLT_CHOICE(IPNET, "Solaris ipnet"),
DLT_CHOICE(CAN_SOCKETCAN, "CAN-bus with SocketCAN headers"),
DLT_CHOICE(IPV4, "Raw IPv4"),
DLT_CHOICE(IPV6, "Raw IPv6"),
DLT_CHOICE(IEEE802_15_4_NOFCS, "IEEE 802.15.4 without FCS"),
DLT_CHOICE(DBUS, "D-Bus"),
DLT_CHOICE(JUNIPER_VS, "Juniper Virtual Server"),
DLT_CHOICE(JUNIPER_SRX_E2E, "Juniper SRX E2E"),
DLT_CHOICE(JUNIPER_FIBRECHANNEL, "Juniper Fibre Channel"),
DLT_CHOICE(DVB_CI, "DVB-CI"),
DLT_CHOICE(MUX27010, "MUX27010"),
DLT_CHOICE(STANAG_5066_D_PDU, "STANAG 5066 D_PDUs"),
DLT_CHOICE(JUNIPER_ATM_CEMIC, "Juniper ATM CEMIC"),
DLT_CHOICE(NFLOG, "Linux netfilter log messages"),
DLT_CHOICE(NETANALYZER, "Ethernet with Hilscher netANALYZER pseudo-header"),
DLT_CHOICE(NETANALYZER_TRANSPARENT, "Ethernet with Hilscher netANALYZER pseudo-header and with preamble and SFD"),
DLT_CHOICE(IPOIB, "RFC 4391 IP-over-Infiniband"),
DLT_CHOICE(MPEG_2_TS, "MPEG-2 transport stream"),
DLT_CHOICE(NG40, "ng40 protocol tester Iub/Iur"),
DLT_CHOICE(NFC_LLCP, "NFC LLCP PDUs with pseudo-header"),
DLT_CHOICE(INFINIBAND, "InfiniBand"),
DLT_CHOICE(SCTP, "SCTP"),
DLT_CHOICE(USBPCAP, "USB with USBPcap header"),
DLT_CHOICE(RTAC_SERIAL, "Schweitzer Engineering Laboratories RTAC packets"),
DLT_CHOICE(BLUETOOTH_LE_LL, "Bluetooth Low Energy air interface"),
DLT_CHOICE(NETLINK, "Linux netlink"),
DLT_CHOICE(BLUETOOTH_LINUX_MONITOR, "Bluetooth Linux Monitor"),
DLT_CHOICE(BLUETOOTH_BREDR_BB, "Bluetooth Basic Rate/Enhanced Data Rate baseband packets"),
DLT_CHOICE(BLUETOOTH_LE_LL_WITH_PHDR, "Bluetooth Low Energy air interface with pseudo-header"),
DLT_CHOICE(PROFIBUS_DL, "PROFIBUS data link layer"),
DLT_CHOICE(PKTAP, "Apple DLT_PKTAP"),
DLT_CHOICE(EPON, "Ethernet with 802.3 Clause 65 EPON preamble"),
DLT_CHOICE(IPMI_HPM_2, "IPMI trace packets"),
DLT_CHOICE(ZWAVE_R1_R2, "Z-Wave RF profile R1 and R2 packets"),
DLT_CHOICE(ZWAVE_R3, "Z-Wave RF profile R3 packets"),
DLT_CHOICE(WATTSTOPPER_DLM, "WattStopper Digital Lighting Management (DLM) and Legrand Nitoo Open protocol"),
DLT_CHOICE(ISO_14443, "ISO 14443 messages"),
DLT_CHOICE(RDS, "IEC 62106 Radio Data System groups"),
DLT_CHOICE(USB_DARWIN, "USB with Darwin header"),
DLT_CHOICE(OPENFLOW, "OpenBSD DLT_OPENFLOW"),
DLT_CHOICE(SDLC, "IBM SDLC frames"),
DLT_CHOICE(TI_LLN_SNIFFER, "TI LLN sniffer frames"),
DLT_CHOICE(VSOCK, "Linux vsock"),
DLT_CHOICE(NORDIC_BLE, "Nordic Semiconductor Bluetooth LE sniffer frames"),
DLT_CHOICE(DOCSIS31_XRA31, "Excentis XRA-31 DOCSIS 3.1 RF sniffer frames"),
DLT_CHOICE(ETHERNET_MPACKET, "802.3br mPackets"),
DLT_CHOICE(DISPLAYPORT_AUX, "DisplayPort AUX channel monitoring data"),
DLT_CHOICE(LINUX_SLL2, "Linux cooked v2"),
DLT_CHOICE(OPENVIZSLA, "OpenVizsla USB"),
DLT_CHOICE(EBHSCR, "Elektrobit High Speed Capture and Replay (EBHSCR)"),
DLT_CHOICE(VPP_DISPATCH, "VPP graph dispatch tracer"),
DLT_CHOICE(DSA_TAG_BRCM, "Broadcom tag"),
DLT_CHOICE(DSA_TAG_BRCM_PREPEND, "Broadcom tag (prepended)"),
DLT_CHOICE(IEEE802_15_4_TAP, "IEEE 802.15.4 with pseudo-header"),
DLT_CHOICE(DSA_TAG_DSA, "Marvell DSA"),
DLT_CHOICE(DSA_TAG_EDSA, "Marvell EDSA"),
DLT_CHOICE(ELEE, "ELEE lawful intercept packets"),
DLT_CHOICE(Z_WAVE_SERIAL, "Z-Wave serial frames between host and chip"),
DLT_CHOICE(USB_2_0, "USB 2.0/1.1/1.0 as transmitted over the cable"),
DLT_CHOICE(ATSC_ALP, "ATSC Link-Layer Protocol packets"),
DLT_CHOICE_SENTINEL
};
int
pcap_datalink_name_to_val(const char *name)
{
int i;
for (i = 0; dlt_choices[i].name != NULL; i++) {
if (pcap_strcasecmp(dlt_choices[i].name, name) == 0)
return (dlt_choices[i].dlt);
}
return (-1);
}
const char *
pcap_datalink_val_to_name(int dlt)
{
int i;
for (i = 0; dlt_choices[i].name != NULL; i++) {
if (dlt_choices[i].dlt == dlt)
return (dlt_choices[i].name);
}
return (NULL);
}
const char *
pcap_datalink_val_to_description(int dlt)
{
int i;
for (i = 0; dlt_choices[i].name != NULL; i++) {
if (dlt_choices[i].dlt == dlt)
return (dlt_choices[i].description);
}
return (NULL);
}
const char *
pcap_datalink_val_to_description_or_dlt(int dlt)
{
static char unkbuf[40];
const char *description;
description = pcap_datalink_val_to_description(dlt);
if (description != NULL) {
return description;
} else {
(void)snprintf(unkbuf, sizeof(unkbuf), "DLT %u", dlt);
return unkbuf;
}
}
struct tstamp_type_choice {
const char *name;
const char *description;
int type;
};
static struct tstamp_type_choice tstamp_type_choices[] = {
{ "host", "Host", PCAP_TSTAMP_HOST },
{ "host_lowprec", "Host, low precision", PCAP_TSTAMP_HOST_LOWPREC },
{ "host_hiprec", "Host, high precision", PCAP_TSTAMP_HOST_HIPREC },
{ "adapter", "Adapter", PCAP_TSTAMP_ADAPTER },
{ "adapter_unsynced", "Adapter, not synced with system time", PCAP_TSTAMP_ADAPTER_UNSYNCED },
{ "host_hiprec_unsynced", "Host, high precision, not synced with system time", PCAP_TSTAMP_HOST_HIPREC_UNSYNCED },
{ NULL, NULL, 0 }
};
int
pcap_tstamp_type_name_to_val(const char *name)
{
int i;
for (i = 0; tstamp_type_choices[i].name != NULL; i++) {
if (pcap_strcasecmp(tstamp_type_choices[i].name, name) == 0)
return (tstamp_type_choices[i].type);
}
return (PCAP_ERROR);
}
const char *
pcap_tstamp_type_val_to_name(int tstamp_type)
{
int i;
for (i = 0; tstamp_type_choices[i].name != NULL; i++) {
if (tstamp_type_choices[i].type == tstamp_type)
return (tstamp_type_choices[i].name);
}
return (NULL);
}
const char *
pcap_tstamp_type_val_to_description(int tstamp_type)
{
int i;
for (i = 0; tstamp_type_choices[i].name != NULL; i++) {
if (tstamp_type_choices[i].type == tstamp_type)
return (tstamp_type_choices[i].description);
}
return (NULL);
}
int
pcap_snapshot(pcap_t *p)
{
if (!p->activated)
return (PCAP_ERROR_NOT_ACTIVATED);
return (p->snapshot);
}
int
pcap_is_swapped(pcap_t *p)
{
if (!p->activated)
return (PCAP_ERROR_NOT_ACTIVATED);
return (p->swapped);
}
int
pcap_major_version(pcap_t *p)
{
if (!p->activated)
return (PCAP_ERROR_NOT_ACTIVATED);
return (p->version_major);
}
int
pcap_minor_version(pcap_t *p)
{
if (!p->activated)
return (PCAP_ERROR_NOT_ACTIVATED);
return (p->version_minor);
}
int
pcap_bufsize(pcap_t *p)
{
if (!p->activated)
return (PCAP_ERROR_NOT_ACTIVATED);
return (p->bufsize);
}
FILE *
pcap_file(pcap_t *p)
{
return (p->rfile);
}
#ifdef _WIN32
int
pcap_fileno(pcap_t *p)
{
if (p->handle != INVALID_HANDLE_VALUE) {
/*
* This is a bogus and now-deprecated API; we
* squelch the narrowing warning for the cast
* from HANDLE to DWORD. If Windows programmmers
* need to get at the HANDLE for a pcap_t, *if*
* there is one, they should request such a
* routine (and be prepared for it to return
* INVALID_HANDLE_VALUE).
*/
DIAG_OFF_NARROWING
return ((int)(DWORD)p->handle);
DIAG_ON_NARROWING
} else
return (PCAP_ERROR);
}
#else /* _WIN32 */
int
pcap_fileno(pcap_t *p)
{
return (p->fd);
}
#endif /* _WIN32 */
#if !defined(_WIN32) && !defined(MSDOS)
int
pcap_get_selectable_fd(pcap_t *p)
{
return (p->selectable_fd);
}
const struct timeval *
pcap_get_required_select_timeout(pcap_t *p)
{
return (p->required_select_timeout);
}
#endif
void
pcap_perror(pcap_t *p, const char *prefix)
{
fprintf(stderr, "%s: %s\n", prefix, p->errbuf);
}
char *
pcap_geterr(pcap_t *p)
{
return (p->errbuf);
}
int
pcap_getnonblock(pcap_t *p, char *errbuf)
{
int ret;
ret = p->getnonblock_op(p);
if (ret == -1) {
/*
* The get nonblock operation sets p->errbuf; this
* function *shouldn't* have had a separate errbuf
* argument, as it didn't need one, but I goofed
* when adding it.
*
* We copy the error message to errbuf, so callers
* can find it in either place.
*/
pcap_strlcpy(errbuf, p->errbuf, PCAP_ERRBUF_SIZE);
}
return (ret);
}
/*
* Get the current non-blocking mode setting, under the assumption that
* it's just the standard POSIX non-blocking flag.
*/
#if !defined(_WIN32) && !defined(MSDOS)
int
pcap_getnonblock_fd(pcap_t *p)
{
int fdflags;
fdflags = fcntl(p->fd, F_GETFL, 0);
if (fdflags == -1) {
pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
errno, "F_GETFL");
return (-1);
}
if (fdflags & O_NONBLOCK)
return (1);
else
return (0);
}
#endif
int
pcap_setnonblock(pcap_t *p, int nonblock, char *errbuf)
{
int ret;
ret = p->setnonblock_op(p, nonblock);
if (ret == -1) {
/*
* The set nonblock operation sets p->errbuf; this
* function *shouldn't* have had a separate errbuf
* argument, as it didn't need one, but I goofed
* when adding it.
*
* We copy the error message to errbuf, so callers
* can find it in either place.
*/
pcap_strlcpy(errbuf, p->errbuf, PCAP_ERRBUF_SIZE);
}
return (ret);
}
#if !defined(_WIN32) && !defined(MSDOS)
/*
* Set non-blocking mode, under the assumption that it's just the
* standard POSIX non-blocking flag. (This can be called by the
* per-platform non-blocking-mode routine if that routine also
* needs to do some additional work.)
*/
int
pcap_setnonblock_fd(pcap_t *p, int nonblock)
{
int fdflags;
fdflags = fcntl(p->fd, F_GETFL, 0);
if (fdflags == -1) {
pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
errno, "F_GETFL");
return (-1);
}
if (nonblock)
fdflags |= O_NONBLOCK;
else
fdflags &= ~O_NONBLOCK;
if (fcntl(p->fd, F_SETFL, fdflags) == -1) {
pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
errno, "F_SETFL");
return (-1);
}
return (0);
}
#endif
/*
* Generate error strings for PCAP_ERROR_ and PCAP_WARNING_ values.
*/
const char *
pcap_statustostr(int errnum)
{
static char ebuf[15+10+1];
switch (errnum) {
case PCAP_WARNING:
return("Generic warning");
case PCAP_WARNING_TSTAMP_TYPE_NOTSUP:
return ("That type of time stamp is not supported by that device");
case PCAP_WARNING_PROMISC_NOTSUP:
return ("That device doesn't support promiscuous mode");
case PCAP_ERROR:
return("Generic error");
case PCAP_ERROR_BREAK:
return("Loop terminated by pcap_breakloop");
case PCAP_ERROR_NOT_ACTIVATED:
return("The pcap_t has not been activated");
case PCAP_ERROR_ACTIVATED:
return ("The setting can't be changed after the pcap_t is activated");
case PCAP_ERROR_NO_SUCH_DEVICE:
return ("No such device exists");
case PCAP_ERROR_RFMON_NOTSUP:
return ("That device doesn't support monitor mode");
case PCAP_ERROR_NOT_RFMON:
return ("That operation is supported only in monitor mode");
case PCAP_ERROR_PERM_DENIED:
return ("You don't have permission to capture on that device");
case PCAP_ERROR_IFACE_NOT_UP:
return ("That device is not up");
case PCAP_ERROR_CANTSET_TSTAMP_TYPE:
return ("That device doesn't support setting the time stamp type");
case PCAP_ERROR_PROMISC_PERM_DENIED:
return ("You don't have permission to capture in promiscuous mode on that device");
case PCAP_ERROR_TSTAMP_PRECISION_NOTSUP:
return ("That device doesn't support that time stamp precision");
}
(void)snprintf(ebuf, sizeof ebuf, "Unknown error: %d", errnum);
return(ebuf);
}
/*
* Not all systems have strerror().
*/
const char *
pcap_strerror(int errnum)
{
#ifdef HAVE_STRERROR
#ifdef _WIN32
static char errbuf[PCAP_ERRBUF_SIZE];
errno_t err = strerror_s(errbuf, PCAP_ERRBUF_SIZE, errnum);
if (err != 0) /* err = 0 if successful */
pcap_strlcpy(errbuf, "strerror_s() error", PCAP_ERRBUF_SIZE);
return (errbuf);
#else
return (strerror(errnum));
#endif /* _WIN32 */
#else
extern int sys_nerr;
extern const char *const sys_errlist[];
static char errbuf[PCAP_ERRBUF_SIZE];
if ((unsigned int)errnum < sys_nerr)
return ((char *)sys_errlist[errnum]);
(void)snprintf(errbuf, sizeof errbuf, "Unknown error: %d", errnum);
return (errbuf);
#endif
}
int
pcap_setfilter(pcap_t *p, struct bpf_program *fp)
{
return (p->setfilter_op(p, fp));
}
/*
* Set direction flag, which controls whether we accept only incoming
* packets, only outgoing packets, or both.
* Note that, depending on the platform, some or all direction arguments
* might not be supported.
*/
int
pcap_setdirection(pcap_t *p, pcap_direction_t d)
{
if (p->setdirection_op == NULL) {
snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
"Setting direction is not supported on this device");
return (-1);
} else {
switch (d) {
case PCAP_D_IN:
case PCAP_D_OUT:
case PCAP_D_INOUT:
/*
* Valid direction.
*/
return (p->setdirection_op(p, d));
default:
/*
* Invalid direction.
*/
snprintf(p->errbuf, sizeof(p->errbuf),
"Invalid direction");
return (-1);
}
}
}
int
pcap_stats(pcap_t *p, struct pcap_stat *ps)
{
return (p->stats_op(p, ps));
}
#ifdef _WIN32
struct pcap_stat *
pcap_stats_ex(pcap_t *p, int *pcap_stat_size)
{
return (p->stats_ex_op(p, pcap_stat_size));
}
int
pcap_setbuff(pcap_t *p, int dim)
{
return (p->setbuff_op(p, dim));
}
int
pcap_setmode(pcap_t *p, int mode)
{
return (p->setmode_op(p, mode));
}
int
pcap_setmintocopy(pcap_t *p, int size)
{
return (p->setmintocopy_op(p, size));
}
HANDLE
pcap_getevent(pcap_t *p)
{
return (p->getevent_op(p));
}
int
pcap_oid_get_request(pcap_t *p, bpf_u_int32 oid, void *data, size_t *lenp)
{
return (p->oid_get_request_op(p, oid, data, lenp));
}
int
pcap_oid_set_request(pcap_t *p, bpf_u_int32 oid, const void *data, size_t *lenp)
{
return (p->oid_set_request_op(p, oid, data, lenp));
}
pcap_send_queue *
pcap_sendqueue_alloc(u_int memsize)
{
pcap_send_queue *tqueue;
/* Allocate the queue */
tqueue = (pcap_send_queue *)malloc(sizeof(pcap_send_queue));
if (tqueue == NULL){
return (NULL);
}
/* Allocate the buffer */
tqueue->buffer = (char *)malloc(memsize);
if (tqueue->buffer == NULL) {
free(tqueue);
return (NULL);
}
tqueue->maxlen = memsize;
tqueue->len = 0;
return (tqueue);
}
void
pcap_sendqueue_destroy(pcap_send_queue *queue)
{
free(queue->buffer);
free(queue);
}
int
pcap_sendqueue_queue(pcap_send_queue *queue, const struct pcap_pkthdr *pkt_header, const u_char *pkt_data)
{
if (queue->len + sizeof(struct pcap_pkthdr) + pkt_header->caplen > queue->maxlen){
return (-1);
}
/* Copy the pcap_pkthdr header*/
memcpy(queue->buffer + queue->len, pkt_header, sizeof(struct pcap_pkthdr));
queue->len += sizeof(struct pcap_pkthdr);
/* copy the packet */
memcpy(queue->buffer + queue->len, pkt_data, pkt_header->caplen);
queue->len += pkt_header->caplen;
return (0);
}
u_int
pcap_sendqueue_transmit(pcap_t *p, pcap_send_queue *queue, int sync)
{
return (p->sendqueue_transmit_op(p, queue, sync));
}
int
pcap_setuserbuffer(pcap_t *p, int size)
{
return (p->setuserbuffer_op(p, size));
}
int
pcap_live_dump(pcap_t *p, char *filename, int maxsize, int maxpacks)
{
return (p->live_dump_op(p, filename, maxsize, maxpacks));
}
int
pcap_live_dump_ended(pcap_t *p, int sync)
{
return (p->live_dump_ended_op(p, sync));
}
PAirpcapHandle
pcap_get_airpcap_handle(pcap_t *p)
{
PAirpcapHandle handle;
handle = p->get_airpcap_handle_op(p);
if (handle == NULL) {
(void)snprintf(p->errbuf, sizeof(p->errbuf),
"This isn't an AirPcap device");
}
return (handle);
}
#endif
/*
* On some platforms, we need to clean up promiscuous or monitor mode
* when we close a device - and we want that to happen even if the
* application just exits without explicitl closing devices.
* On those platforms, we need to register a "close all the pcaps"
* routine to be called when we exit, and need to maintain a list of
* pcaps that need to be closed to clean up modes.
*
* XXX - not thread-safe.
*/
/*
* List of pcaps on which we've done something that needs to be
* cleaned up.
* If there are any such pcaps, we arrange to call "pcap_close_all()"
* when we exit, and have it close all of them.
*/
static struct pcap *pcaps_to_close;
/*
* TRUE if we've already called "atexit()" to cause "pcap_close_all()" to
* be called on exit.
*/
static int did_atexit;
static void
pcap_close_all(void)
{
struct pcap *handle;
while ((handle = pcaps_to_close) != NULL) {
pcap_close(handle);
/*
* If a pcap module adds a pcap_t to the "close all"
* list by calling pcap_add_to_pcaps_to_close(), it
* must have a cleanup routine that removes it from the
* list, by calling pcap_remove_from_pcaps_to_close(),
* and must make that cleanup routine the cleanup_op
* for the pcap_t.
*
* That means that, after pcap_close() - which calls
* the cleanup_op for the pcap_t - the pcap_t must
* have been removed from the list, so pcaps_to_close
* must not be equal to handle.
*
* We check for that, and abort if handle is still
* at the head of the list, to prevent infinite loops.
*/
if (pcaps_to_close == handle)
abort();
}
}
int
pcap_do_addexit(pcap_t *p)
{
/*
* If we haven't already done so, arrange to have
* "pcap_close_all()" called when we exit.
*/
if (!did_atexit) {
if (atexit(pcap_close_all) != 0) {
/*
* "atexit()" failed; let our caller know.
*/
pcap_strlcpy(p->errbuf, "atexit failed", PCAP_ERRBUF_SIZE);
return (0);
}
did_atexit = 1;
}
return (1);
}
void
pcap_add_to_pcaps_to_close(pcap_t *p)
{
p->next = pcaps_to_close;
pcaps_to_close = p;
}
void
pcap_remove_from_pcaps_to_close(pcap_t *p)
{
pcap_t *pc, *prevpc;
for (pc = pcaps_to_close, prevpc = NULL; pc != NULL;
prevpc = pc, pc = pc->next) {
if (pc == p) {
/*
* Found it. Remove it from the list.
*/
if (prevpc == NULL) {
/*
* It was at the head of the list.
*/
pcaps_to_close = pc->next;
} else {
/*
* It was in the middle of the list.
*/
prevpc->next = pc->next;
}
break;
}
}
}
void
pcap_breakloop_common(pcap_t *p)
{
p->break_loop = 1;
}
void
pcap_cleanup_live_common(pcap_t *p)
{
if (p->buffer != NULL) {
free(p->buffer);
p->buffer = NULL;
}
if (p->dlt_list != NULL) {
free(p->dlt_list);
p->dlt_list = NULL;
p->dlt_count = 0;
}
if (p->tstamp_type_list != NULL) {
free(p->tstamp_type_list);
p->tstamp_type_list = NULL;
p->tstamp_type_count = 0;
}
if (p->tstamp_precision_list != NULL) {
free(p->tstamp_precision_list);
p->tstamp_precision_list = NULL;
p->tstamp_precision_count = 0;
}
pcap_freecode(&p->fcode);
#if !defined(_WIN32) && !defined(MSDOS)
if (p->fd >= 0) {
close(p->fd);
p->fd = -1;
}
p->selectable_fd = -1;
#endif
}
/*
* API compatible with WinPcap's "send a packet" routine - returns -1
* on error, 0 otherwise.
*
* XXX - what if we get a short write?
*/
int
pcap_sendpacket(pcap_t *p, const u_char *buf, int size)
{
if (size <= 0) {
pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
errno, "The number of bytes to be sent must be positive");
return (PCAP_ERROR);
}
if (p->inject_op(p, buf, size) == -1)
return (-1);
return (0);
}
/*
* API compatible with OpenBSD's "send a packet" routine - returns -1 on
* error, number of bytes written otherwise.
*/
int
pcap_inject(pcap_t *p, const void *buf, size_t size)
{
/*
* We return the number of bytes written, so the number of
* bytes to write must fit in an int.
*/
if (size > INT_MAX) {
pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
errno, "More than %d bytes cannot be injected", INT_MAX);
return (PCAP_ERROR);
}
if (size == 0) {
pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE,
errno, "The number of bytes to be injected must not be zero");
return (PCAP_ERROR);
}
return (p->inject_op(p, buf, (int)size));
}
void
pcap_close(pcap_t *p)
{
if (p->opt.device != NULL)
free(p->opt.device);
p->cleanup_op(p);
free(p);
}
/*
* Helpers for safely loding code at run time.
* Currently Windows-only.
*/
#ifdef _WIN32
//
// This wrapper around loadlibrary appends the system folder (usually
// C:\Windows\System32) to the relative path of the DLL, so that the DLL
// is always loaded from an absolute path (it's no longer possible to
// load modules from the application folder).
// This solves the DLL Hijacking issue discovered in August 2010:
//
// https://blog.rapid7.com/2010/08/23/exploiting-dll-hijacking-flaws/
// https://blog.rapid7.com/2010/08/23/application-dll-load-hijacking/
// (the purported Rapid7 blog post link in the first of those two links
// is broken; the second of those links works.)
//
// If any links there are broken from all the content shuffling Rapid&
// did, see archived versions of the posts at their original homes, at
//
// https://web.archive.org/web/20110122175058/http://blog.metasploit.com/2010/08/exploiting-dll-hijacking-flaws.html
// https://web.archive.org/web/20100828112111/http://blog.rapid7.com/?p=5325
//
pcap_code_handle_t
pcap_load_code(const char *name)
{
/*
* XXX - should this work in UTF-16LE rather than in the local
* ANSI code page?
*/
CHAR path[MAX_PATH];
CHAR fullFileName[MAX_PATH];
UINT res;
HMODULE hModule = NULL;
do
{
res = GetSystemDirectoryA(path, MAX_PATH);
if (res == 0) {
//
// some bad failure occurred;
//
break;
}
if (res > MAX_PATH) {
//
// the buffer was not big enough
//
SetLastError(ERROR_INSUFFICIENT_BUFFER);
break;
}
if (res + 1 + strlen(name) + 1 < MAX_PATH) {
memcpy(fullFileName, path, res * sizeof(TCHAR));
fullFileName[res] = '\\';
memcpy(&fullFileName[res + 1], name, (strlen(name) + 1) * sizeof(TCHAR));
hModule = LoadLibraryA(fullFileName);
} else
SetLastError(ERROR_INSUFFICIENT_BUFFER);
} while(FALSE);
return hModule;
}
pcap_funcptr_t
pcap_find_function(pcap_code_handle_t code, const char *func)
{
return (GetProcAddress(code, func));
}
#endif
/*
* Given a BPF program, a pcap_pkthdr structure for a packet, and the raw
* data for the packet, check whether the packet passes the filter.
* Returns the return value of the filter program, which will be zero if
* the packet doesn't pass and non-zero if the packet does pass.
*/
int
pcap_offline_filter(const struct bpf_program *fp, const struct pcap_pkthdr *h,
const u_char *pkt)
{
const struct bpf_insn *fcode = fp->bf_insns;
if (fcode != NULL)
return (pcap_filter(fcode, pkt, h->len, h->caplen));
else
return (0);
}
static int
pcap_can_set_rfmon_dead(pcap_t *p)
{
snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
"Rfmon mode doesn't apply on a pcap_open_dead pcap_t");
return (PCAP_ERROR);
}
static int
pcap_read_dead(pcap_t *p, int cnt _U_, pcap_handler callback _U_,
u_char *user _U_)
{
snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
"Packets aren't available from a pcap_open_dead pcap_t");
return (-1);
}
static int
pcap_inject_dead(pcap_t *p, const void *buf _U_, int size _U_)
{
snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
"Packets can't be sent on a pcap_open_dead pcap_t");
return (-1);
}
static int
pcap_setfilter_dead(pcap_t *p, struct bpf_program *fp _U_)
{
snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
"A filter cannot be set on a pcap_open_dead pcap_t");
return (-1);
}
static int
pcap_setdirection_dead(pcap_t *p, pcap_direction_t d _U_)
{
snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
"The packet direction cannot be set on a pcap_open_dead pcap_t");
return (-1);
}
static int
pcap_set_datalink_dead(pcap_t *p, int dlt _U_)
{
snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
"The link-layer header type cannot be set on a pcap_open_dead pcap_t");
return (-1);
}
static int
pcap_getnonblock_dead(pcap_t *p)
{
snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
"A pcap_open_dead pcap_t does not have a non-blocking mode setting");
return (-1);
}
static int
pcap_setnonblock_dead(pcap_t *p, int nonblock _U_)
{
snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
"A pcap_open_dead pcap_t does not have a non-blocking mode setting");
return (-1);
}
static int
pcap_stats_dead(pcap_t *p, struct pcap_stat *ps _U_)
{
snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
"Statistics aren't available from a pcap_open_dead pcap_t");
return (-1);
}
#ifdef _WIN32
static struct pcap_stat *
pcap_stats_ex_dead(pcap_t *p, int *pcap_stat_size _U_)
{
snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
"Statistics aren't available from a pcap_open_dead pcap_t");
return (NULL);
}
static int
pcap_setbuff_dead(pcap_t *p, int dim _U_)
{
snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
"The kernel buffer size cannot be set on a pcap_open_dead pcap_t");
return (-1);
}
static int
pcap_setmode_dead(pcap_t *p, int mode _U_)
{
snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
"impossible to set mode on a pcap_open_dead pcap_t");
return (-1);
}
static int
pcap_setmintocopy_dead(pcap_t *p, int size _U_)
{
snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
"The mintocopy parameter cannot be set on a pcap_open_dead pcap_t");
return (-1);
}
static HANDLE
pcap_getevent_dead(pcap_t *p)
{
snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
"A pcap_open_dead pcap_t has no event handle");
return (INVALID_HANDLE_VALUE);
}
static int
pcap_oid_get_request_dead(pcap_t *p, bpf_u_int32 oid _U_, void *data _U_,
size_t *lenp _U_)
{
snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
"An OID get request cannot be performed on a pcap_open_dead pcap_t");
return (PCAP_ERROR);
}
static int
pcap_oid_set_request_dead(pcap_t *p, bpf_u_int32 oid _U_, const void *data _U_,
size_t *lenp _U_)
{
snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
"An OID set request cannot be performed on a pcap_open_dead pcap_t");
return (PCAP_ERROR);
}
static u_int
pcap_sendqueue_transmit_dead(pcap_t *p, pcap_send_queue *queue _U_,
int sync _U_)
{
snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
"Packets cannot be transmitted on a pcap_open_dead pcap_t");
return (0);
}
static int
pcap_setuserbuffer_dead(pcap_t *p, int size _U_)
{
snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
"The user buffer cannot be set on a pcap_open_dead pcap_t");
return (-1);
}
static int
pcap_live_dump_dead(pcap_t *p, char *filename _U_, int maxsize _U_,
int maxpacks _U_)
{
snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
"Live packet dumping cannot be performed on a pcap_open_dead pcap_t");
return (-1);
}
static int
pcap_live_dump_ended_dead(pcap_t *p, int sync _U_)
{
snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
"Live packet dumping cannot be performed on a pcap_open_dead pcap_t");
return (-1);
}
static PAirpcapHandle
pcap_get_airpcap_handle_dead(pcap_t *p _U_)
{
return (NULL);
}
#endif /* _WIN32 */
static void
pcap_cleanup_dead(pcap_t *p _U_)
{
/* Nothing to do. */
}
pcap_t *
pcap_open_dead_with_tstamp_precision(int linktype, int snaplen, u_int precision)
{
pcap_t *p;
switch (precision) {
case PCAP_TSTAMP_PRECISION_MICRO:
case PCAP_TSTAMP_PRECISION_NANO:
break;
default:
/*
* This doesn't really matter, but we don't have any way
* to report particular errors, so the only failure we
* should have is a memory allocation failure. Just
* pick microsecond precision.
*/
precision = PCAP_TSTAMP_PRECISION_MICRO;
break;
}
p = malloc(sizeof(*p));
if (p == NULL)
return NULL;
memset (p, 0, sizeof(*p));
p->snapshot = snaplen;
p->linktype = linktype;
p->opt.tstamp_precision = precision;
p->can_set_rfmon_op = pcap_can_set_rfmon_dead;
p->read_op = pcap_read_dead;
p->inject_op = pcap_inject_dead;
p->setfilter_op = pcap_setfilter_dead;
p->setdirection_op = pcap_setdirection_dead;
p->set_datalink_op = pcap_set_datalink_dead;
p->getnonblock_op = pcap_getnonblock_dead;
p->setnonblock_op = pcap_setnonblock_dead;
p->stats_op = pcap_stats_dead;
#ifdef _WIN32
p->stats_ex_op = pcap_stats_ex_dead;
p->setbuff_op = pcap_setbuff_dead;
p->setmode_op = pcap_setmode_dead;
p->setmintocopy_op = pcap_setmintocopy_dead;
p->getevent_op = pcap_getevent_dead;
p->oid_get_request_op = pcap_oid_get_request_dead;
p->oid_set_request_op = pcap_oid_set_request_dead;
p->sendqueue_transmit_op = pcap_sendqueue_transmit_dead;
p->setuserbuffer_op = pcap_setuserbuffer_dead;
p->live_dump_op = pcap_live_dump_dead;
p->live_dump_ended_op = pcap_live_dump_ended_dead;
p->get_airpcap_handle_op = pcap_get_airpcap_handle_dead;
#endif
p->cleanup_op = pcap_cleanup_dead;
/*
* A "dead" pcap_t never requires special BPF code generation.
*/
p->bpf_codegen_flags = 0;
p->activated = 1;
return (p);
}
pcap_t *
pcap_open_dead(int linktype, int snaplen)
{
return (pcap_open_dead_with_tstamp_precision(linktype, snaplen,
PCAP_TSTAMP_PRECISION_MICRO));
}
#ifdef YYDEBUG
/*
* Set the internal "debug printout" flag for the filter expression parser.
* The code to print that stuff is present only if YYDEBUG is defined, so
* the flag, and the routine to set it, are defined only if YYDEBUG is
* defined.
*
* This is intended for libpcap developers, not for general use.
* If you want to set these in a program, you'll have to declare this
* routine yourself, with the appropriate DLL import attribute on Windows;
* it's not declared in any header file, and won't be declared in any
* header file provided by libpcap.
*/
PCAP_API void pcap_set_parser_debug(int value);
PCAP_API_DEF void
pcap_set_parser_debug(int value)
{
pcap_debug = value;
}
#endif