* 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.
- *
- * @(#) $Header: /tcpdump/master/libpcap/pcap-int.h,v 1.21 2000-05-04 13:34:24 itojun Exp $ (LBL)
*/
#ifndef pcap_int_h
-#define pcap_int_h
+#define pcap_int_h
+
+#include <pcap/pcap.h>
-#include <pcap.h>
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#if defined(_WIN32)
+ /*
+ * Make sure Packet32.h doesn't define BPF structures that we've
+ * probably already defined as a result of including <pcap/pcap.h>.
+ */
+ #define BPF_MAJOR_VERSION
+ #include <Packet32.h>
+#elif defined(MSDOS)
+ #include <fcntl.h>
+ #include <io.h>
+#endif
+
+#if (defined(_MSC_VER) && (_MSC_VER <= 1200)) /* we are compiling with Visual Studio 6, that doesn't support the LL suffix*/
/*
- * Savefile
+ * Swap byte ordering of unsigned long long timestamp on a big endian
+ * machine.
*/
-struct pcap_sf {
- FILE *rfile;
- int swapped;
- int version_major;
- int version_minor;
- u_char *base;
+#define SWAPLL(ull) ((ull & 0xff00000000000000) >> 56) | \
+ ((ull & 0x00ff000000000000) >> 40) | \
+ ((ull & 0x0000ff0000000000) >> 24) | \
+ ((ull & 0x000000ff00000000) >> 8) | \
+ ((ull & 0x00000000ff000000) << 8) | \
+ ((ull & 0x0000000000ff0000) << 24) | \
+ ((ull & 0x000000000000ff00) << 40) | \
+ ((ull & 0x00000000000000ff) << 56)
+
+#else /* A recent Visual studio compiler or not VC */
+
+/*
+ * Swap byte ordering of unsigned long long timestamp on a big endian
+ * machine.
+ */
+#define SWAPLL(ull) ((ull & 0xff00000000000000LL) >> 56) | \
+ ((ull & 0x00ff000000000000LL) >> 40) | \
+ ((ull & 0x0000ff0000000000LL) >> 24) | \
+ ((ull & 0x000000ff00000000LL) >> 8) | \
+ ((ull & 0x00000000ff000000LL) << 8) | \
+ ((ull & 0x0000000000ff0000LL) << 24) | \
+ ((ull & 0x000000000000ff00LL) << 40) | \
+ ((ull & 0x00000000000000ffLL) << 56)
+
+#endif /* _MSC_VER */
+
+/*
+ * Maximum snapshot length.
+ *
+ * Somewhat arbitrary, but chosen to be:
+ *
+ * 1) big enough for maximum-size Linux loopback packets (65549)
+ * and some USB packets captured with USBPcap:
+ *
+ * http://desowin.org/usbpcap/
+ *
+ * (> 131072, < 262144)
+ *
+ * and
+ *
+ * 2) small enough not to cause attempts to allocate huge amounts of
+ * memory; some applications might use the snapshot length in a
+ * savefile header to control the size of the buffer they allocate,
+ * so a size of, say, 2^31-1 might not work well.
+ *
+ * We don't enforce this in pcap_set_snaplen(), but we use it internally.
+ */
+#define MAXIMUM_SNAPLEN 262144
+
+struct pcap_opt {
+ char *device;
+ int timeout; /* timeout for buffering */
+ int buffer_size;
+ int promisc;
+ int rfmon; /* monitor mode */
+ int immediate; /* immediate mode - deliver packets as soon as they arrive */
+ int tstamp_type;
+ int tstamp_precision;
};
-struct pcap_md {
- struct pcap_stat stat;
- /*XXX*/
- int use_bpf;
- u_long TotPkts; /* can't oflow for 79 hrs on ether */
- u_long TotAccepted; /* count accepted by filter */
- u_long TotDrops; /* count of dropped packets */
- long TotMissed; /* missed by i/f during this run */
- long OrigMissed; /* missed by i/f before this run */
-#ifdef linux
- int pad;
- int skip;
- char *device;
+typedef int (*activate_op_t)(pcap_t *);
+typedef int (*can_set_rfmon_op_t)(pcap_t *);
+typedef int (*read_op_t)(pcap_t *, int cnt, pcap_handler, u_char *);
+typedef int (*inject_op_t)(pcap_t *, const void *, size_t);
+typedef int (*setfilter_op_t)(pcap_t *, struct bpf_program *);
+typedef int (*setdirection_op_t)(pcap_t *, pcap_direction_t);
+typedef int (*set_datalink_op_t)(pcap_t *, int);
+typedef int (*getnonblock_op_t)(pcap_t *, char *);
+typedef int (*setnonblock_op_t)(pcap_t *, int, char *);
+typedef int (*stats_op_t)(pcap_t *, struct pcap_stat *);
+#ifdef _WIN32
+typedef struct pcap_stat *(*stats_ex_op_t)(pcap_t *, int *);
+typedef int (*setbuff_op_t)(pcap_t *, int);
+typedef int (*setmode_op_t)(pcap_t *, int);
+typedef int (*setmintocopy_op_t)(pcap_t *, int);
+typedef HANDLE (*getevent_op_t)(pcap_t *);
+typedef int (*oid_get_request_op_t)(pcap_t *, bpf_u_int32, void *, size_t *);
+typedef int (*oid_set_request_op_t)(pcap_t *, bpf_u_int32, const void *, size_t *);
+typedef u_int (*sendqueue_transmit_op_t)(pcap_t *, pcap_send_queue *, int);
+typedef int (*setuserbuffer_op_t)(pcap_t *, int);
+typedef int (*live_dump_op_t)(pcap_t *, char *, int, int);
+typedef int (*live_dump_ended_op_t)(pcap_t *, int);
+typedef PAirpcapHandle (*get_airpcap_handle_op_t)(pcap_t *);
#endif
-};
+typedef void (*cleanup_op_t)(pcap_t *);
+/*
+ * We put all the stuff used in the read code path at the beginning,
+ * to try to keep it together in the same cache line or lines.
+ */
struct pcap {
- int fd;
- int snapshot;
- int linktype;
- int tzoff; /* timezone offset */
- int offset; /* offset for proper alignment */
+ /*
+ * Method to call to read packets on a live capture.
+ */
+ read_op_t read_op;
+
+ /*
+ * Method to call to read packets from a savefile.
+ */
+ int (*next_packet_op)(pcap_t *, struct pcap_pkthdr *, u_char **);
- struct pcap_sf sf;
- struct pcap_md md;
+#ifdef _WIN32
+ ADAPTER *adapter;
+#else
+ int fd;
+ int selectable_fd;
+#endif /* _WIN32 */
/*
* Read buffer.
*/
int bufsize;
- u_char *buffer;
+ void *buffer;
u_char *bp;
int cc;
+ int break_loop; /* flag set to force break from packet-reading loop */
+
+ void *priv; /* private data for methods */
+
+ int swapped;
+ FILE *rfile; /* null if live capture, non-null if savefile */
+ int fddipad;
+ struct pcap *next; /* list of open pcaps that need stuff cleared on close */
+
+ /*
+ * File version number; meaningful only for a savefile, but we
+ * keep it here so that apps that (mistakenly) ask for the
+ * version numbers will get the same zero values that they
+ * always did.
+ */
+ int version_major;
+ int version_minor;
+
+ int snapshot;
+ int linktype; /* Network linktype */
+ int linktype_ext; /* Extended information stored in the linktype field of a file */
+ int tzoff; /* timezone offset */
+ int offset; /* offset for proper alignment */
+ int activated; /* true if the capture is really started */
+ int oldstyle; /* if we're opening with pcap_open_live() */
+
+ struct pcap_opt opt;
+
/*
* Place holder for pcap_next().
*/
u_char *pkt;
-
+#ifdef _WIN32
+ struct pcap_stat stat; /* used for pcap_stats_ex() */
+#endif
+
+ /* We're accepting only packets in this direction/these directions. */
+ pcap_direction_t direction;
+
+ /*
+ * Flags to affect BPF code generation.
+ */
+ int bpf_codegen_flags;
+
/*
* Placeholder for filter code if bpf not in kernel.
*/
struct bpf_program fcode;
- char errbuf[PCAP_ERRBUF_SIZE];
+ char errbuf[PCAP_ERRBUF_SIZE + 1];
+ int dlt_count;
+ u_int *dlt_list;
+ int tstamp_type_count;
+ u_int *tstamp_type_list;
+ int tstamp_precision_count;
+ u_int *tstamp_precision_list;
+
+ struct pcap_pkthdr pcap_header; /* This is needed for the pcap_next_ex() to work */
+
+ /*
+ * More methods.
+ */
+ activate_op_t activate_op;
+ can_set_rfmon_op_t can_set_rfmon_op;
+ inject_op_t inject_op;
+ setfilter_op_t setfilter_op;
+ setdirection_op_t setdirection_op;
+ set_datalink_op_t set_datalink_op;
+ getnonblock_op_t getnonblock_op;
+ setnonblock_op_t setnonblock_op;
+ stats_op_t stats_op;
+
+ /*
+ * Routine to use as callback for pcap_next()/pcap_next_ex().
+ */
+ pcap_handler oneshot_callback;
+
+#ifdef _WIN32
+ /*
+ * These are, at least currently, specific to the Win32 NPF
+ * driver.
+ */
+ stats_ex_op_t stats_ex_op;
+ setbuff_op_t setbuff_op;
+ setmode_op_t setmode_op;
+ setmintocopy_op_t setmintocopy_op;
+ getevent_op_t getevent_op;
+ oid_get_request_op_t oid_get_request_op;
+ oid_set_request_op_t oid_set_request_op;
+ sendqueue_transmit_op_t sendqueue_transmit_op;
+ setuserbuffer_op_t setuserbuffer_op;
+ live_dump_op_t live_dump_op;
+ live_dump_ended_op_t live_dump_ended_op;
+ get_airpcap_handle_op_t get_airpcap_handle_op;
+#endif
+ cleanup_op_t cleanup_op;
};
/*
- * This is a timeval as stored in disk in a dumpfile.
+ * BPF code generation flags.
+ */
+#define BPF_SPECIAL_VLAN_HANDLING 0x00000001 /* special VLAN handling for Linux */
+
+/*
+ * This is a timeval as stored in a savefile.
* It has to use the same types everywhere, independent of the actual
- * `struct timeval'
+ * `struct timeval'; `struct timeval' has 32-bit tv_sec values on some
+ * platforms and 64-bit tv_sec values on other platforms, and writing
+ * out native `struct timeval' values would mean files could only be
+ * read on systems with the same tv_sec size as the system on which
+ * the file was written.
*/
struct pcap_timeval {
};
/*
- * How a `pcap_pkthdr' is actually stored in the dumpfile.
+ * This is a `pcap_pkthdr' as actually stored in a savefile.
+ *
+ * Do not change the format of this structure, in any way (this includes
+ * changes that only affect the length of fields in this structure),
+ * and do not make the time stamp anything other than seconds and
+ * microseconds (e.g., seconds and nanoseconds). Instead:
+ *
+ * introduce a new structure for the new format;
+ *
+ * a new magic number for your new capture file format, and, when
+ * you get the new magic number, put it in "savefile.c";
+ *
+ * use that magic number for save files with the changed record
+ * header;
+ *
+ * make the code in "savefile.c" capable of reading files with
+ * the old record header as well as files with the new record header
+ * (using the magic number to determine the header format).
+ *
+ * Then supply the changes by forking the branch at
+ *
+ * https://github.com/the-tcpdump-group/libpcap/issues
+ *
+ * and issuing a pull request, so that future versions of libpcap and
+ * programs that use it (such as tcpdump) will be able to read your new
+ * capture file format.
*/
struct pcap_sf_pkthdr {
bpf_u_int32 len; /* length this packet (off wire) */
};
-int yylex(void);
+/*
+ * How a `pcap_pkthdr' is actually stored in savefiles written
+ * by some patched versions of libpcap (e.g. the ones in Red
+ * Hat Linux 6.1 and 6.2).
+ *
+ * Do not change the format of this structure, in any way (this includes
+ * changes that only affect the length of fields in this structure).
+ * Instead, introduce a new structure, as per the above.
+ */
+
+struct pcap_sf_patched_pkthdr {
+ struct pcap_timeval ts; /* time stamp */
+ bpf_u_int32 caplen; /* length of portion present */
+ bpf_u_int32 len; /* length this packet (off wire) */
+ int index;
+ unsigned short protocol;
+ unsigned char pkt_type;
+};
+
+/*
+ * User data structure for the one-shot callback used for pcap_next()
+ * and pcap_next_ex().
+ */
+struct oneshot_userdata {
+ struct pcap_pkthdr *hdr;
+ const u_char **pkt;
+ pcap_t *pd;
+};
#ifndef min
#define min(a, b) ((a) > (b) ? (b) : (a))
#endif
-/* XXX should these be in pcap.h? */
int pcap_offline_read(pcap_t *, int, pcap_handler, u_char *);
-int pcap_read(pcap_t *, int cnt, pcap_handler, u_char *);
-
-/* Ultrix pads to make everything line up on a nice boundary */
-#if defined(ultrix) || defined(__alpha) || defined(__NetBSD__)
-#define PCAP_FDDIPAD 3
-#endif
#ifndef HAVE_STRLCPY
#define strlcpy(x, y, z) \
- (strncpy((x), (y), (z)), (x)[(z) - 1] = '\0', strlen((y)))
+ (strncpy((x), (y), (z)), \
+ ((z) <= 0 ? 0 : ((x)[(z) - 1] = '\0')), \
+ strlen((y)))
+#endif
+
+#include <stdarg.h>
+
+/*
+ * For flagging arguments as format strings in MSVC.
+ */
+#if _MSC_VER >= 1400
+ #include <sal.h>
+ #if _MSC_VER > 1400
+ #define FORMAT_STRING(p) _Printf_format_string_ p
+ #else
+ #define FORMAT_STRING(p) __format_string p
+ #endif
+#else
+ #define FORMAT_STRING(p) p
+#endif
+
+/*
+ * On Windows, snprintf(), with that name and with C99 behavior - i.e.,
+ * guaranteeing that the formatted string is null-terminated - didn't
+ * appear until Visual Studio 2015. Prior to that, the C runtime had
+ * only _snprintf(), which *doesn't* guarantee that the string is
+ * null-terminated if it is truncated due to the buffer being too
+ * small. We therefore can't just define snprintf to be _snprintf
+ * and define vsnprintf to be _vsnprintf, as we're relying on null-
+ * termination of strings in all cases.
+ *
+ * We also want to allow this to be built with versions of Visual Studio
+ * prior to VS 2015, so we can't rely on snprintf() being present.
+ *
+ * And we want to make sure that, if we support plugins in the future,
+ * a routine with C99 snprintf() behavior will be available to them.
+ * We also don't want it to collide with the C library snprintf() if
+ * there is one.
+ *
+ * So we make pcap_snprintf() and pcap_vsnprintf() available, either by
+ * #defining them to be snprintf or vsnprintf, respectively, or by
+ * defining our own versions and exporting them.
+ */
+#ifdef HAVE_SNPRINTF
+#define pcap_snprintf snprintf
+#else
+extern int pcap_snprintf(char *, size_t, FORMAT_STRING(const char *), ...);
+#endif
+
+#ifdef HAVE_VSNPRINTF
+#define pcap_vsnprintf vsnprintf
+#else
+extern int pcap_vsnprintf(char *, size_t, const char *, va_list ap);
+#endif
+
+/*
+ * Does the packet count argument to a module's read routine say
+ * "supply packets until you run out of packets"?
+ */
+#define PACKET_COUNT_IS_UNLIMITED(count) ((count) <= 0)
+
+/*
+ * Routines that most pcap implementations can use for non-blocking mode.
+ */
+#if !defined(_WIN32) && !defined(MSDOS)
+int pcap_getnonblock_fd(pcap_t *, char *);
+int pcap_setnonblock_fd(pcap_t *p, int, char *);
+#endif
+
+/*
+ * Internal interfaces for "pcap_create()".
+ *
+ * "pcap_create_interface()" is the routine to do a pcap_create on
+ * a regular network interface. There are multiple implementations
+ * of this, one for each platform type (Linux, BPF, DLPI, etc.),
+ * with the one used chosen by the configure script.
+ *
+ * "pcap_create_common()" allocates and fills in a pcap_t, for use
+ * by pcap_create routines.
+ */
+pcap_t *pcap_create_interface(const char *, char *);
+pcap_t *pcap_create_common(char *, size_t);
+int pcap_do_addexit(pcap_t *);
+void pcap_add_to_pcaps_to_close(pcap_t *);
+void pcap_remove_from_pcaps_to_close(pcap_t *);
+void pcap_cleanup_live_common(pcap_t *);
+int pcap_check_activated(pcap_t *);
+
+/*
+ * Internal interfaces for "pcap_findalldevs()".
+ *
+ * "pcap_platform_finddevs()" is a platform-dependent routine to
+ * find local network interfaces.
+ *
+ * "pcap_findalldevs_interfaces()" is a helper to find those interfaces
+ * using the "standard" mechanisms (SIOCGIFCONF, "getifaddrs()", etc.).
+ *
+ * "pcap_add_if()" adds an interface to the list of interfaces, for
+ * use by various "find interfaces" routines.
+ */
+int pcap_platform_finddevs(pcap_if_t **, char *);
+#if !defined(_WIN32) && !defined(MSDOS)
+int pcap_findalldevs_interfaces(pcap_if_t **, char *,
+ int (*)(const char *));
+#endif
+int add_addr_to_iflist(pcap_if_t **, const char *, bpf_u_int32,
+ struct sockaddr *, size_t, struct sockaddr *, size_t,
+ struct sockaddr *, size_t, struct sockaddr *, size_t, char *);
+int add_addr_to_dev(pcap_if_t *, struct sockaddr *, size_t,
+ struct sockaddr *, size_t, struct sockaddr *, size_t,
+ struct sockaddr *dstaddr, size_t, char *errbuf);
+int pcap_add_if(pcap_if_t **, const char *, bpf_u_int32, const char *,
+ char *);
+int add_or_find_if(pcap_if_t **, pcap_if_t **, const char *, bpf_u_int32,
+ const char *, char *);
+#ifndef _WIN32
+bpf_u_int32 if_flags_to_pcap_flags(const char *, u_int);
+#endif
+
+/*
+ * Internal interfaces for "pcap_open_offline()".
+ *
+ * "pcap_open_offline_common()" allocates and fills in a pcap_t, for use
+ * by pcap_open_offline routines.
+ *
+ * "sf_cleanup()" closes the file handle associated with a pcap_t, if
+ * appropriate, and frees all data common to all modules for handling
+ * savefile types.
+ */
+pcap_t *pcap_open_offline_common(char *ebuf, size_t size);
+void sf_cleanup(pcap_t *p);
+
+/*
+ * Internal interfaces for both "pcap_create()" and routines that
+ * open savefiles.
+ *
+ * "pcap_oneshot()" is the standard one-shot callback for "pcap_next()"
+ * and "pcap_next_ex()".
+ */
+void pcap_oneshot(u_char *, const struct pcap_pkthdr *, const u_char *);
+
+#ifdef _WIN32
+void pcap_win32_err_to_str(DWORD, char *);
+#endif
+
+int install_bpf_program(pcap_t *, struct bpf_program *);
+
+int pcap_strcasecmp(const char *, const char *);
+
+#ifdef __cplusplus
+}
#endif
-/* XXX */
-extern int pcap_fddipad;
#endif
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