| /* |
| * Copyright (c) 1994, 1995, 1996 |
| * 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. |
| */ |
| |
| #ifndef pcap_int_h |
| #define pcap_int_h |
| |
| #include <pcap/pcap.h> |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| #ifdef WIN32 |
| #include <Packet32.h> |
| extern CRITICAL_SECTION g_PcapCompileCriticalSection; |
| #endif /* WIN32 */ |
| |
| #ifdef 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*/ |
| |
| /* |
| * Swap byte ordering of unsigned long long timestamp on a big endian |
| * machine. |
| */ |
| #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 *source; |
| 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; |
| }; |
| |
| 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 int (*setbuff_op_t)(pcap_t *, int); |
| typedef int (*setmode_op_t)(pcap_t *, int); |
| typedef int (*setmintocopy_op_t)(pcap_t *, int); |
| typedef Adapter *(*getadapter_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 { |
| /* |
| * Method to call to read packets on a live capture. |
| */ |
| read_op_t read_op; |
| |
| /* |
| * Method to call to read to read packets from a savefile. |
| */ |
| int (*next_packet_op)(pcap_t *, struct pcap_pkthdr *, u_char **); |
| |
| #ifdef WIN32 |
| ADAPTER *adapter; |
| LPPACKET Packet; |
| int nonblock; |
| #else |
| int fd; |
| int selectable_fd; |
| #endif /* WIN32 */ |
| |
| /* |
| * Read buffer. |
| */ |
| int bufsize; |
| u_char *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; |
| |
| /* 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 + 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. |
| */ |
| setbuff_op_t setbuff_op; |
| setmode_op_t setmode_op; |
| setmintocopy_op_t setmintocopy_op; |
| getadapter_op_t getadapter_op; |
| #endif |
| cleanup_op_t cleanup_op; |
| }; |
| |
| /* |
| * 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' 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 { |
| bpf_int32 tv_sec; /* seconds */ |
| bpf_int32 tv_usec; /* microseconds */ |
| }; |
| |
| /* |
| * 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; |
| * |
| * send mail to "tcpdump-workers@lists.tcpdump.org", requesting |
| * 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 { |
| struct pcap_timeval ts; /* time stamp */ |
| bpf_u_int32 caplen; /* length of portion present */ |
| bpf_u_int32 len; /* length this packet (off wire) */ |
| }; |
| |
| /* |
| * 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; |
| }; |
| |
| int yylex(void); |
| |
| #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 *); |
| |
| #ifndef HAVE_STRLCPY |
| #define strlcpy(x, y, z) \ |
| (strncpy((x), (y), (z)), \ |
| ((z) <= 0 ? 0 : ((x)[(z) - 1] = '\0')), \ |
| strlen((y))) |
| #endif |
| |
| #include <stdarg.h> |
| |
| #if !defined(HAVE_SNPRINTF) |
| #define snprintf pcap_snprintf |
| extern int snprintf (char *, size_t, const char *, ...); |
| #endif |
| |
| #if !defined(HAVE_VSNPRINTF) |
| #define vsnprintf pcap_vsnprintf |
| extern int 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(const char *, 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_not_initialized(pcap_t *); |
| int pcap_check_activated(pcap_t *); |
| |
| /* |
| * Internal interfaces for "pcap_findalldevs()". |
| * |
| * "pcap_findalldevs_interfaces()" finds interfaces using the |
| * "standard" mechanisms (SIOCGIFCONF, "getifaddrs()", etc.). |
| * |
| * "pcap_platform_finddevs()" is a platform-dependent routine to |
| * add devices not found by the "standard" mechanisms. |
| * |
| * "pcap_add_if()" adds an interface to the list of interfaces, for |
| * use by various "find interfaces" routines. |
| */ |
| int pcap_findalldevs_interfaces(pcap_if_t **, char *); |
| int pcap_platform_finddevs(pcap_if_t **, char *); |
| int add_addr_to_iflist(pcap_if_t **, const char *, u_int, 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 *, u_int, const char *, char *); |
| struct sockaddr *dup_sockaddr(struct sockaddr *, size_t); |
| int add_or_find_if(pcap_if_t **, pcap_if_t **, const char *, u_int, |
| const char *, char *); |
| |
| /* |
| * 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 |
| char *pcap_win32strerror(void); |
| #endif |
| |
| int install_bpf_program(pcap_t *, struct bpf_program *); |
| |
| int pcap_strcasecmp(const char *, const char *); |
| |
| #ifdef __cplusplus |
| } |
| #endif |
| |
| #endif |