fluffy/pcap.h

#ifndef __PCAP_H__
#define __PCAP_H__

#include <stdio.h>
#include <stdint.h>

#define MAGIC 0xa1b2c3d4
#define MAXFRAME 9000

struct pcap_file {
  FILE *f;
  int   swap;
};

struct pcap_file_header {
  uint32_t magic;
  uint16_t version_major;
  uint16_t version_minor;
  int32_t  thiszone;          /* gmt to local correction */
  uint32_t sigfigs;           /* accuracy of timestamps */
  int32_t  snaplen;           /* max length saved portion of each pkt */
  int32_t  linktype;          /* data link type (LINKTYPE_*) */
};

struct pcap_pkthdr {
  struct pcap_timeval {
    uint32_t tv_sec;
    uint32_t tv_usec;
  } ts;                         /* time stamp */
  uint32_t   caplen;            /* length of portion present */
  uint32_t   len;               /* length this packet (off wire) */
};

#ifndef max
#  define max(a, b) ((a)>(b)?(a):(b))
#endif

#ifndef min
#  define min(a, b) ((a)<(b)?(a):(b))
#endif

#define bswap32(i) (((i & 0xff000000) >> 030) | \
                    ((i & 0x00ff0000) >> 010) | \
                    ((i & 0x0000ff00) << 010) | \
                    ((i & 0x000000ff) << 030))
#define bswap16(i) (((i & 0xff00) >> 010) | \
                    ((i & 0x00ff) << 010))


/* Debugging help */
#define DUMPf(fmt, args...) fprintf(stderr, "%s:%s:%d " fmt "\n", __FILE__, __FUNCTION__, __LINE__, ##args)
#define DUMP() DUMPf("")
#define DUMP_d(v) DUMPf("%s = %d", #v, v)
#define DUMP_u(v) DUMPf("%s = %u", #v, v)
#define DUMP_x(v) DUMPf("%s = 0x%x", #v, v)
#define DUMP_s(v) DUMPf("%s = %s", #v, v)
#define DUMP_c(v) DUMPf("%s = %c", #v, v)
#define DUMP_p(v) DUMPf("%s = %p", #v, v)

int pcap_open_in(struct pcap_file *ctx, FILE *f);
int pcap_open_out(struct pcap_file *ctx, FILE *f);
int pcap_read_pkthdr(struct pcap_file *ctx, struct pcap_pkthdr *hdr);
int pcap_write_pkthdr(struct pcap_file *ctx, struct pcap_pkthdr *hdr);
void pcap_close(struct pcap_file *ctx);

#endif /* __PCAP_H__ */