mirror of
https://github.com/pavel-odintsov/fastnetmon
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69 lines
1.9 KiB
C
69 lines
1.9 KiB
C
#ifndef FASTNETMON_PCAP_FORMAT_H
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#define FASTNETMON_PCAP_FORMAT_H
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#include <stdint.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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/*
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pcap dump format:
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global header: struct pcap_file_header
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packet header: struct fastnetmon_pcap_pkthdr
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*/
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/*
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* Compatibility for systems that have a bpf.h that
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* predates the bpf typedefs for 64-bit support.
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*/
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#if BPF_RELEASE - 0 < 199406
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typedef int bpf_int32;
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typedef u_int bpf_u_int32;
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#endif
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// We use copy and paste from pcap.h here because we do not want to link with pcap here
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struct fastnetmon_pcap_file_header {
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bpf_u_int32 magic;
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u_short version_major;
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u_short version_minor;
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bpf_int32 thiszone; /* gmt to local correction */
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bpf_u_int32 sigfigs; /* accuracy of timestamps */
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bpf_u_int32 snaplen; /* max length saved portion of each pkt */
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bpf_u_int32 linktype; /* data link type (LINKTYPE_*) */
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};
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/*
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TODO: move to this code, get rid any bpf* custom types
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struct fastnetmon_pcap_file_header {
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uint32_t magic;
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uint16_t version_major;
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uint16_t version_minor;
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int32_t thiszone;
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uint32_t sigfigs;
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uint32_t snaplen;
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uint32_t linktype;
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};
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*/
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// We can't use pcap_pkthdr from upstream because it uses 16 bytes timeval instead of 8 byte and
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// broke everything
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struct fastnetmon_pcap_pkthdr {
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uint32_t ts_sec; /* timestamp seconds */
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uint32_t ts_usec; /* timestamp microseconds */
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uint32_t incl_len; /* number of octets of packet saved in file */
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uint32_t orig_len; /* actual length of packet */
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};
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typedef void (*pcap_packet_parser_callback)(char* buffer, uint32_t len, uint32_t snaplen);
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int pcap_reader(const char* pcap_file_path, pcap_packet_parser_callback pcap_parse_packet_function_ptr);
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bool fill_pcap_header(struct fastnetmon_pcap_file_header* pcap_header, bpf_u_int32 snap_length);
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#endif
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