libpcap.h

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#ifndef __W_LIBPCAP_H__
#define __W_LIBPCAP_H__
 
#include <wiretap/wtap.h>
 
/* Magic numbers in "libpcap" files.
 
   "libpcap" file records are written in the byte order of the host that
   writes them, and the reader is expected to fix this up.
 
   PCAP_MAGIC is the magic number, in host byte order; PCAP_SWAPPED_MAGIC
   is a byte-swapped version of that.
 
   PCAP_MODIFIED_MAGIC is for Alexey Kuznetsov's modified "libpcap"
   format, as generated on Linux systems that have a "libpcap" with
   his patches, at
 
    http://ftp.sunet.se/pub/os/Linux/ip-routing/lbl-tools/
 
   applied; PCAP_SWAPPED_MODIFIED_MAGIC is the byte-swapped version.
 
   PCAP_IXIAMODIFIED_MAGIC is used by IXIA's lcap file format. It adds
   a length field at the end of the file header (size of all records).
   PCAP_SWAPPED_IXIAMODIFIED_MAGIC is the byte-swapped version.
 
   PCAP_NSEC_MAGIC is for Ulf Lamping's modified "libpcap" format,
   which uses the same common file format as PCAP_MAGIC, but the
   timestamps are saved in nanosecond resolution instead of microseconds.
   PCAP_SWAPPED_NSEC_MAGIC is a byte-swapped version of that. */
#define PCAP_MAGIC          0xa1b2c3d4
#define PCAP_SWAPPED_MAGIC      0xd4c3b2a1
#define PCAP_MODIFIED_MAGIC     0xa1b2cd34
#define PCAP_SWAPPED_MODIFIED_MAGIC 0x34cdb2a1
#define PCAP_IXIAHW_MAGIC       0x1c0001ac
#define PCAP_SWAPPED_IXIAHW_MAGIC   0xac01001c
#define PCAP_IXIASW_MAGIC       0x1c0001ab
#define PCAP_SWAPPED_IXIASW_MAGIC   0xab01001c
#define PCAP_NSEC_MAGIC         0xa1b23c4d
#define PCAP_SWAPPED_NSEC_MAGIC     0x4d3cb2a1
 
/* "libpcap" file header (minus magic number). */
struct pcap_hdr {
    uint16_t version_major; /* major version number */
    uint16_t version_minor; /* minor version number */
    int32_t  thiszone;  /* GMT to local correction */
    uint32_t sigfigs;   /* accuracy of timestamps */
    uint32_t snaplen;   /* max length of captured packets, in octets */
    uint32_t network;   /* data link type */
};
 
/* "libpcap" record header. */
struct pcaprec_hdr {
    uint32_t ts_sec;    /* timestamp seconds */
    uint32_t ts_usec;   /* timestamp microseconds (nsecs for PCAP_NSEC_MAGIC) */
    uint32_t incl_len;  /* number of octets of packet saved in file */
    uint32_t orig_len;  /* actual length of packet */
};
 
/* "libpcap" record header for Alexey's patched version. */
struct pcaprec_modified_hdr {
    struct pcaprec_hdr hdr; /* the regular header */
    uint32_t ifindex;   /* index, in *capturing* machine's list of
                   interfaces, of the interface on which this
                   packet came in. */
    uint16_t protocol;  /* Ethernet packet type */
    uint8_t pkt_type;   /* broadcast/multicast/etc. indication */
    uint8_t pad;        /* pad to a 4-byte boundary */
};
 
/* "libpcap" record header for Alexey's patched version in its ss990915
   incarnation; this version shows up in SuSE Linux 6.3. */
struct pcaprec_ss990915_hdr {
    struct pcaprec_hdr hdr; /* the regular header */
    uint32_t ifindex;   /* index, in *capturing* machine's list of
                   interfaces, of the interface on which this
                   packet came in. */
    uint16_t protocol;  /* Ethernet packet type */
    uint8_t pkt_type;   /* broadcast/multicast/etc. indication */
    uint8_t cpu1, cpu2; /* SMP debugging gunk? */
    uint8_t pad[3];     /* pad to a 4-byte boundary */
};
 
/* "libpcap" record header for version used on some Nokia boxes (firewalls?) */
struct pcaprec_nokia_hdr {
    struct pcaprec_hdr hdr; /* the regular header */
    uint8_t stuff[4];   /* mysterious stuff */
};
 
wtap_open_return_val libpcap_open(wtap *wth, int *err, char **err_info);
 
#endif