hyperscan 學習-跨包檢測

0x01編譯和安裝：

         http://www.colm.net/files/ragel/ragel-6.10.tar.gz

    git clone git://github/01org/hyperscan

    GCC, v4.8.1 or higher

        Clang, v3.4 or higher (with libstdc++ or libc++)

        Intel C++ Compiler v15 or higher

Dependency	Version	Notes
CMake	>=2.8.11
Ragel	6.9
Python	2.7
Boost	>=1.57	Boost headers required
Pcap	>=0.8	Optional: needed for example code only

0x02功能介紹：

        Hyperscan是一款來自于Intel的高性能的正規表達式比對庫。它是基于X86平台以PCRE為原型而開發的，并以BSD許可開源在https://01.org/hyperscan。在支援PCRE的大部分文法的前提下，Hyperscan增加了特定的文法和工作模式來保證其在真實網絡場景下的實用性。與此同時，大量高效算法及IntelSIMD*指令的使用實作了Hyperscan的高性能比對。Hyperscan适用于部署在諸如DPI/IPS/IDS/FW等場景中,目前已經在全球多個客戶網絡安全方案中得到實際的應用。此外，Hyperscan還支援和開源IDS/IPS産品Snort(https://www.snort.org)和Suricata (https://suricata-ids.org)內建，使其應用更加廣泛。

0x03 example學習（直接上源碼和注釋）：參考http://www.cnblogs.com/zzqcn/p/4904290.html

/*
 * pcapscan使用并對比了兩種比對模式：BLOCK和STREAM。BLOCK模式時它對單個資料包進行比對；
 * 而STREAM模式下它通過五元組将資料包進行簡單分流，并對每條流中的資料進行比對。STREAM模式
 * 可以命中跨越資料包邊界的比對資料（比如，要比對abc，而a在前一個資料的末尾，而bc在後一個數
 * 據包的前端，這兩個資料包在一個流中，那麼STREAM模式比對可以命中它，而BLOCK模式不能）。
 * Build instructions:
 *
 *     g++ -std=c++11 -O2 -o pcapscan pcapscan.cc $(pkg-config --cflags --libs libhs) -lpcap
 *
 * Usage:
 *
 *     ./pcapscan [-n repeats] <pattern file> <pcap file>
 *
 * 規則檔案格式為
 *    ID1: /pcre/
 *	  ID2: /pcre/
 *
 * 推薦在多核處理器上用taskset隔離處理；
 *
 */

#include <cstring>
#include <chrono>
#include <fstream>
#include <iomanip>
#include <iostream>
#include <string>
#include <unordered_map>
#include <vector>

#include <unistd.h>

// We use the BSD primitives throughout as they exist on both BSD and Linux.
#define __FAVOR_BSD
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/tcp.h>
#include <netinet/udp.h>
#include <netinet/ip_icmp.h>
#include <net/ethernet.h>
#include <arpa/inet.h>

#include <pcap.h>

#include <hs.h>

using std::cerr;
using std::cout;
using std::endl;
using std::ifstream;
using std::string;
using std::unordered_map;
using std::vector;

// Key for identifying a stream in our pcap input data, using data from its IP
// headers.
struct FiveTuple {
    unsigned int protocol;
    unsigned int srcAddr;
    unsigned int srcPort;
    unsigned int dstAddr;
    unsigned int dstPort;

    // Construct a FiveTuple from a TCP or UDP packet.
    FiveTuple(const struct ip *iphdr) {
        // IP fields
        protocol = iphdr->ip_p;
        srcAddr = iphdr->ip_src.s_addr;
        dstAddr = iphdr->ip_dst.s_addr;

        // UDP/TCP ports
        const struct udphdr *uh =
            (const struct udphdr *)(((const char *)iphdr) + (iphdr->ip_hl * 4));
        srcPort = uh->uh_sport;
        dstPort = uh->uh_dport;
    }

    bool operator==(const FiveTuple &a) const {
        return protocol == a.protocol && srcAddr == a.srcAddr &&
               srcPort == a.srcPort && dstAddr == a.dstAddr &&
               dstPort == a.dstPort;
    }
};

// A *very* simple hash function, used when we create an unordered_map of
// FiveTuple objects.
struct FiveTupleHash {
    size_t operator()(const FiveTuple &x) const {
        return x.srcAddr ^ x.dstAddr ^ x.protocol ^ x.srcPort ^ x.dstPort;
    }
};

// Helper function. See end of file.
static bool payloadOffset(const unsigned char *pkt_data, unsigned int *offset,
                          unsigned int *length);

// Match event handler: called every time Hyperscan finds a match.
//比對命中回調函數
static
int onMatch(unsigned int id, unsigned long long from, unsigned long long to,
            unsigned int flags, void *ctx) {
    // Our context points to a size_t storing the match count
    size_t *matches = (size_t *)ctx;
    (*matches)++;
    return 0; // continue matching
}

// Simple timing class，簡單的定時器類
class Clock {
public:
    void start() {
        time_start = std::chrono::system_clock::now();
    }

    void stop() {
        time_end = std::chrono::system_clock::now();
    }

    double seconds() const {
        std::chrono::duration<double> delta = time_end - time_start;
        return delta.count();
    }
private:
    std::chrono::time_point<std::chrono::system_clock> time_start, time_end;
};

// Class wrapping all state associated with the benchmark
class Benchmark {
private:
    // Packet data to be scanned.
    vector<string> packets;

    // The stream ID to which each packet belongs
    vector<size_t> stream_ids;

    // Map used to construct stream_ids
    unordered_map<FiveTuple, size_t, FiveTupleHash> stream_map;

    // Hyperscan compiled database (streaming mode)
    const hs_database_t *db_streaming;

    // Hyperscan compiled database (block mode)
    const hs_database_t *db_block;

    // Hyperscan temporary scratch space (used in both modes)
    hs_scratch_t *scratch;

    // Vector of Hyperscan stream state (used in streaming mode)
    vector<hs_stream_t *> streams;

    // Count of matches found during scanning
    size_t matchCount;

public:
    Benchmark(const hs_database_t *streaming, const hs_database_t *block)
        : db_streaming(streaming), db_block(block), scratch(nullptr),
          matchCount(0) {
        // Allocate enough scratch space to handle either streaming or block
        // mode, so we only need the one scratch region.
    	//Benchmark構造函數中，為接下來的比對配置設定足夠的臨時資料空間(scratch space）。這裡有一個技巧：
    	//1）BLOCK和STREAM模式的比對隻需共用一個scratch；
    	//2）這個scratch足夠大，方法是調用兩次，在第2次調用時hyperscan如果發現空間不夠會進行增加。
        hs_error_t err = hs_alloc_scratch(db_streaming, &scratch);
        if (err != HS_SUCCESS) {
            cerr << "ERROR: could not allocate scratch space. Exiting." << endl;
            exit(-1);
        }
        // This second call will increase the scratch size if more is required
        // for block mode.
        err = hs_alloc_scratch(db_block, &scratch);
        if (err != HS_SUCCESS) {
            cerr << "ERROR: could not allocate scratch space. Exiting." << endl;
            exit(-1);
        }
    }

    ~Benchmark() {
        // Free scratch region
        hs_free_scratch(scratch);
    }

    // Read a set of streams from a pcap file
    //此流的建立知識做簡單按包中的順序建立，沒有考慮丢包、重傳、亂序的情況；
    bool readStreams(const char *pcapFile) {
        // Open PCAP file for input
        char errbuf[PCAP_ERRBUF_SIZE];
        pcap_t *pcapHandle = pcap_open_offline(pcapFile, errbuf);
        if (pcapHandle == nullptr) {
            cerr << "ERROR: Unable to open pcap file \"" << pcapFile
                << "\": " << errbuf << endl;
            return false;
        }

        struct pcap_pkthdr pktHeader;
        const unsigned char *pktData;
        while ((pktData = pcap_next(pcapHandle, &pktHeader)) != nullptr) {
            unsigned int offset = 0, length = 0;
            if (!payloadOffset(pktData, &offset, &length)) {
                continue;
            }

            // Valid TCP or UDP packet
            const struct ip *iphdr = (const struct ip *)(pktData
                    + sizeof(struct ether_header));
            const char *payload = (const char *)pktData + offset;
            //5元組進行流hash
            size_t id = stream_map.insert(std::make_pair(FiveTuple(iphdr),
                                          stream_map.size())).first->second;

            packets.push_back(string(payload, length));
            stream_ids.push_back(id); //用向量作為hash表；
        }
        pcap_close(pcapHandle);

        return !packets.empty();
    }

    // Return the number of bytes scanned
    size_t bytes() const {
        size_t sum = 0;
        for (const auto &packet : packets) {
            sum += packet.size();
        }
        return sum;
    }

    // Return the number of matches found.
    size_t matches() const {
        return matchCount;
    }

    // Clear the number of matches found.
    void clearMatches() {
        matchCount = 0;
    }

    // Open a Hyperscan stream for each stream in stream_ids
    // 打開一條流
    void openStreams() {
        streams.resize(stream_map.size());
        for (auto &stream : streams) {
            hs_error_t err = hs_open_stream(db_streaming, 0, &stream);
            if (err != HS_SUCCESS) {
                cerr << "ERROR: Unable to open stream. Exiting." << endl;
                exit(-1);
            }
        }
    }

    // Close all open Hyperscan streams (potentially generating any
    // end-anchored matches)
    void closeStreams() {
        for (auto &stream : streams) {
            hs_error_t err = hs_close_stream(stream, scratch, onMatch,
                                             &matchCount);
            if (err != HS_SUCCESS) {
                cerr << "ERROR: Unable to close stream. Exiting." << endl;
                exit(-1);
            }
        }
    }

    // Scan each packet (in the ordering given in the PCAP file) through
    // Hyperscan using the streaming interface.
    // 掃描所有的流，進行比對
    void scanStreams() {
    	//如何利用到時間是關鍵
        for (size_t i = 0; i != packets.size(); ++i) {
            const std::string &pkt = packets[i];
            /* 函數原型
             * hs_error_t hs_scan_stream(hs_stream_t * id,
                          const char * data,
                          unsigned int length,
                          unsigned int flags,
                          hs_scratch_t * scratch,
                          match_event_handler onEvent,
                          void * ctxt)
             * */
            hs_error_t err = hs_scan_stream(streams[stream_ids[i]],
                                            pkt.c_str(), pkt.length(), 0,
                                            scratch, onMatch, &matchCount);
            if (err != HS_SUCCESS) {
                cerr << "ERROR: Unable to scan packet. Exiting." << endl;
                exit(-1);
            }
        }
    }

    // Scan each packet (in the ordering given in the PCAP file) through
    // Hyperscan using the block-mode interface.
    void scanBlock() {
        for (size_t i = 0; i != packets.size(); ++i) {
            const std::string &pkt = packets[i];
            hs_error_t err = hs_scan(db_block, pkt.c_str(), pkt.length(), 0,
                                     scratch, onMatch, &matchCount);
            if (err != HS_SUCCESS) {
                cerr << "ERROR: Unable to scan packet. Exiting." << endl;
                exit(-1);
            }
        }
    }

    // Display some information about the compiled database and scanned data.
    void displayStats() {
        size_t numPackets = packets.size();
        size_t numStreams = stream_map.size();
        size_t numBytes = bytes();
        hs_error_t err;

        cout << numPackets << " packets in " << numStreams
             << " streams, totalling " << numBytes << " bytes." << endl;
        cout << "Average packet length: " << numBytes / numPackets << " bytes."
             << endl;
        cout << "Average stream length: " << numBytes / numStreams << " bytes."
             << endl;
        cout << endl;

        size_t dbStream_size = 0;
        err = hs_database_size(db_streaming, &dbStream_size);
        if (err == HS_SUCCESS) {
            cout << "Streaming mode Hyperscan database size    : "
                 << dbStream_size << " bytes." << endl;
        } else {
            cout << "Error getting streaming mode Hyperscan database size"
                 << endl;
        }

        size_t dbBlock_size = 0;
        err = hs_database_size(db_block, &dbBlock_size);
        if (err == HS_SUCCESS) {
            cout << "Block mode Hyperscan database size        : "
                 << dbBlock_size << " bytes." << endl;
        } else {
            cout << "Error getting block mode Hyperscan database size"
                 << endl;
        }

        size_t stream_size = 0;
        err = hs_stream_size(db_streaming, &stream_size);
        if (err == HS_SUCCESS) {
            cout << "Streaming mode Hyperscan stream state size: "
                 << stream_size << " bytes (per stream)." << endl;
        } else {
            cout << "Error getting stream state size" << endl;
        }
    }
};

// helper function - see end of file
static void parseFile(const char *filename, vector<string> &patterns,
                      vector<unsigned> &flags, vector<unsigned> &ids);

//mode 模式為塊模式和流模式
static hs_database_t *buildDatabase(const vector<const char *> &expressions,
                                    const vector<unsigned> flags,
                                    const vector<unsigned> ids,
                                    unsigned int mode) {
    hs_database_t *db;
    hs_compile_error_t *compileErr;
    hs_error_t err;

    Clock clock;
    clock.start();
    //hs_compile_multi的調用，此函數用來編譯多個正規表達式，從代碼可見除了mode參數，BLOCK和STREAM模式都使用這一API。
    err = hs_compile_multi(expressions.data(), flags.data(), ids.data(),
                           expressions.size(), mode, nullptr, &db, &compileErr);

    clock.stop();

    if (err != HS_SUCCESS) {
        if (compileErr->expression < 0) {
            // The error does not refer to a particular expression.
            cerr << "ERROR: " << compileErr->message << endl;
        } else {
            cerr << "ERROR: Pattern '" << expressions[compileErr->expression]
                 << "' failed compilation with error: " << compileErr->message
                 << endl;
        }
        // As the compileErr pointer points to dynamically allocated memory, if
        // we get an error, we must be sure to release it. This is not
        // necessary when no error is detected.
        hs_free_compile_error(compileErr);
        exit(-1);
    }

    cout << "Hyperscan " << (mode == HS_MODE_STREAM ? "streaming" : "block")
         << " mode database compiled in " << clock.seconds() << " seconds."
         << endl;

    return db;
}

/**
 * This function will read in the file with the specified name, with an
 * expression per line, ignoring lines starting with '#' and build a Hyperscan
 * database for it.
 * 這個函數将讀一個指定檔案名檔案，提取規則表達式，忽略#注釋。
 */
static void databasesFromFile(const char *filename,
                              hs_database_t **db_streaming,
                              hs_database_t **db_block) {
    // hs_compile_multi requires three parallel arrays containing the patterns,
    // hs_compile_multi 需要三個平行數組容器存儲模式，辨別和ID。
    // flags and ids that we want to work with. To achieve this we use
    // vectors and new entries onto each for each valid line of input from
    // the pattern file.
	//用三個向量來存儲相關條目；
    vector<string> patterns; //模式
    vector<unsigned> flags;  //辨別
    vector<unsigned> ids;    //規則ID

    // do the actual file reading and string handling
    parseFile(filename, patterns, flags, ids);

    // Turn our vector of strings into a vector of char*'s to pass in to
    // hs_compile_multi. (This is just using the vector of strings as dynamic
    // storage.)
    //将vector中字元串對象轉換成一個C字元串指針傳入到hs_compile_multi；
    /*函數原型：  hs_error_t hs_compile_multi(const char *const * expressions,
                                const unsigned int * flags,
                                const unsigned int * ids,
                                unsigned int elements,
                                unsigned int mode,
                                const hs_platform_info_t * platform,
                                hs_database_t ** db,
                                hs_compile_error_t ** error)*/
    vector<const char*> cstrPatterns;
    for (const auto &pattern : patterns) {
        cstrPatterns.push_back(pattern.c_str());
    }

    cout << "Compiling Hyperscan databases with " << patterns.size()
         << " patterns." << endl;

    /* 建構流和塊資料庫 */
    *db_streaming = buildDatabase(cstrPatterns, flags, ids, HS_MODE_STREAM);
    *db_block = buildDatabase(cstrPatterns, flags, ids, HS_MODE_BLOCK);
}

static void usage(const char *prog) {
    cerr << "Usage: " << prog << " [-n repeats] <pattern file> <pcap file>" << endl;
}

// Main entry point.
int main(int argc, char **argv) {
    unsigned int repeatCount = 1;

    // Process command line arguments.
    int opt;
    while ((opt = getopt(argc, argv, "n:")) != -1) {
        switch (opt) {
        case 'n':
            repeatCount = atoi(optarg);
            break;
        default:
            usage(argv[0]);
            exit(-1);
        }
    }

    if (argc - optind != 2) {
        usage(argv[0]);
        exit(-1);
    }

    const char *patternFile = argv[optind];
    const char *pcapFile = argv[optind + 1];

    // Read our pattern set in and build Hyperscan databases from it.
    cout << "Pattern file: " << patternFile << endl;

    /* 建構規則資料庫 ，分為流模式和塊模式  */
    hs_database_t *db_streaming, *db_block;
    databasesFromFile(patternFile, &db_streaming, &db_block);

    // Read our input PCAP file in
    Benchmark bench(db_streaming, db_block); //建構基準測試類
    cout << "PCAP input file: " << pcapFile << endl;
    if (!bench.readStreams(pcapFile)) {
        cerr << "Unable to read packets from PCAP file. Exiting." << endl;
        exit(-1);
    }

    if (repeatCount != 1) {
        cout << "Repeating PCAP scan " << repeatCount << " times." << endl;
    }

    bench.displayStats();

    Clock clock;

    // Streaming mode scans.
    double secsStreamingScan = 0.0, secsStreamingOpenClose = 0.0;
    for (unsigned int i = 0; i < repeatCount; i++) {
        // Open streams.
        clock.start();
        bench.openStreams();
        clock.stop();
        secsStreamingOpenClose += clock.seconds();

        // Scan all our packets in streaming mode.
        clock.start();
        bench.scanStreams();
        clock.stop();
        secsStreamingScan += clock.seconds();

        // Close streams.
        clock.start();
        bench.closeStreams();
        clock.stop();
        secsStreamingOpenClose += clock.seconds();
    }

    // Collect data from streaming mode scans.
    size_t bytes = bench.bytes();
    double tputStreamScanning = (bytes * 8 * repeatCount) / secsStreamingScan;
    double tputStreamOverhead = (bytes * 8 * repeatCount) / (secsStreamingScan + secsStreamingOpenClose);
    size_t matchesStream = bench.matches();
    double matchRateStream = matchesStream / ((bytes * repeatCount) / 1024.0); // matches per kilobyte

    // Scan all our packets in block mode.
    bench.clearMatches();
    clock.start();
    for (unsigned int i = 0; i < repeatCount; i++) {
        bench.scanBlock();
    }
    clock.stop();
    double secsScanBlock = clock.seconds();

    // Collect data from block mode scans.
    double tputBlockScanning = (bytes * 8 * repeatCount) / secsScanBlock;
    size_t matchesBlock = bench.matches();
    double matchRateBlock = matchesBlock / ((bytes * repeatCount) / 1024.0); // matches per kilobyte

    cout << endl << "Streaming mode:" << endl << endl;
    cout << "  Total matches: " << matchesStream << endl;
    cout << std::fixed << std::setprecision(4);
    cout << "  Match rate:    " << matchRateStream << " matches/kilobyte" << endl;
    cout << std::fixed << std::setprecision(2);
    cout << "  Throughput (with stream overhead): "
              << tputStreamOverhead/1000000 << " megabits/sec" << endl;
    cout << "  Throughput (no stream overhead):   "
              << tputStreamScanning/1000000 << " megabits/sec" << endl;

    cout << endl << "Block mode:" << endl << endl;
    cout << "  Total matches: " << matchesBlock << endl;
    cout << std::fixed << std::setprecision(4);
    cout << "  Match rate:    " << matchRateBlock << " matches/kilobyte" << endl;
    cout << std::fixed << std::setprecision(2);
    cout << "  Throughput:    "
              << tputBlockScanning/1000000 << " megabits/sec" << endl;

    cout << endl;
    if (bytes < (2*1024*1024)) {
        cout << endl << "WARNING: Input PCAP file is less than 2MB in size." << endl
                  << "This test may have been too short to calculate accurate results." << endl;
    }

    // Close Hyperscan databases
    hs_free_database(db_streaming);
    hs_free_database(db_block);

    return 0;
}

/**
 * Helper function to locate the offset of the first byte of the payload in the
 * given ethernet frame. Offset into the packet, and the length of the payload
 * are returned in the arguments @a offset and @a length.
 * 主要是pcap格式有一個頭自己的辨別頭， 标準的協定層次eth-ip-tcp/udp，沒有特殊情況下的；
 */
static bool payloadOffset(const unsigned char *pkt_data, unsigned int *offset,
                          unsigned int *length) {
    const ip *iph = (const ip *)(pkt_data + sizeof(ether_header));
    const tcphdr *th = nullptr;

    // Ignore packets that aren't IPv4
    // 忽略不是IPV4的資料包
    if (iph->ip_v != 4) {
        return false;
    }

    // Ignore fragmented packets.
    // 忽略IP分片包，根據辨別味
    if (iph->ip_off & htons(IP_MF|IP_OFFMASK)) {
        return false;
    }

    // IP header length, and transport header length.
    unsigned int ihlen = iph->ip_hl * 4;
    unsigned int thlen = 0;

    switch (iph->ip_p) {
    case IPPROTO_TCP:
        th = (const tcphdr *)((const char *)iph + ihlen);
        thlen = th->th_off * 4;
        break;
    case IPPROTO_UDP:
        thlen = sizeof(udphdr);
        break;
    default:
        return false;
    }

    *offset = sizeof(ether_header) + ihlen + thlen;
    *length = sizeof(ether_header) + ntohs(iph->ip_len) - *offset;

    return *length != 0;
}

//正則模式辨別
static unsigned parseFlags(const string &flagsStr) {
    unsigned flags = 0;
    for (const auto &c : flagsStr) {
        switch (c) {
        case 'i':
            flags |= HS_FLAG_CASELESS; break;
        case 'm':
            flags |= HS_FLAG_MULTILINE; break; //如果regexp裡出現了^或者$, 那麼by default隻會比對第一行. 設定了Multiline,會比對所有行.
        case 's':
            flags |= HS_FLAG_DOTALL; break; //預設情況下, .不會比對換行符, 設定了Dotall模式, .會比對所有字元包括換行符
        case 'H':
            flags |= HS_FLAG_SINGLEMATCH; break;
        case 'V':
            flags |= HS_FLAG_ALLOWEMPTY; break;
        case '8':
            flags |= HS_FLAG_UTF8; break;
        case 'W':
            flags |= HS_FLAG_UCP; break;
        case '\r': // stray carriage-return
            break;
        default:
            cerr << "Unsupported flag \'" << c << "\'" << endl;
            exit(-1);
        }
    }
    return flags;
}

static void parseFile(const char *filename, vector<string> &patterns,
                      vector<unsigned> &flags, vector<unsigned> &ids) {
    ifstream inFile(filename);
    if (!inFile.good()) {
        cerr << "ERROR: Can't open pattern file \"" << filename << "\"" << endl;
        exit(-1);
    }

    for (unsigned i = 1; !inFile.eof(); ++i) {
        string line;
        getline(inFile, line);

        // if line is empty, or a comment, we can skip it
        if (line.empty() || line[0] == '#') {
            continue;
        }

        // otherwise, it should be ID:PCRE, e.g.
        //  10001:/foobar/is

        size_t colonIdx = line.find_first_of(':');
        if (colonIdx == string::npos) {
            cerr << "ERROR: Could not parse line " << i << endl;
            exit(-1);
        }

        // we should have an unsigned int as an ID, before the colon
        unsigned id = std::stoi(line.substr(0, colonIdx).c_str());

        // rest of the expression is the PCRE
        const string expr(line.substr(colonIdx + 1));

        size_t flagsStart = expr.find_last_of('/');
        if (flagsStart == string::npos) {
            cerr << "ERROR: no trailing '/' char" << endl;
            exit(-1);
        }

        string pcre(expr.substr(1, flagsStart - 1));
        string flagsStr(expr.substr(flagsStart + 1, expr.size() - flagsStart));
        unsigned flag = parseFlags(flagsStr);

        patterns.push_back(pcre);
        flags.push_back(flag);
        ids.push_back(id);
    }
}


           

0x04測試結果

   規則： 123:/GET\s/js6/main.jsp([\s\S]*?)[email protected]([\s\S]*?)secu_info/

   包： 3.2M包 這個特征跨兩個包

   結果：

[email protected]:/home/pangyemeng/hyperscan-master/build/bin# ./pcapscan test get.pcap 
Pattern file: test
Compiling Hyperscan databases with 1 patterns.
Hyperscan streaming mode database compiled in 0.00425785 seconds.
Hyperscan block mode database compiled in 0.00526345 seconds.
PCAP input file: get.pcap
2 packets in 1 streams, totalling 2384 bytes.
Average packet length: 1192 bytes.
Average stream length: 2384 bytes.

Streaming mode Hyperscan database size    : 4984 bytes.
Block mode Hyperscan database size        : 5048 bytes.
Streaming mode Hyperscan stream state size: 51 bytes (per stream).

Streaming mode:

  Total matches: 1
  Match rate:    0.4295 matches/kilobyte
  Throughput (with stream overhead): 225.22 megabits/sec
  Throughput (no stream overhead):   248.09 megabits/sec

Block mode:

  Total matches: 0
  Match rate:    0.0000 matches/kilobyte
  Throughput:    2129.76 megabits/sec


WARNING: Input PCAP file is less than 2MB in size.
This test may have been too short to calculate accurate results.
           

0x05 吸引我的地方

     1、跨包檢測；

     2、流檢測；

     如果能做出良好的設計，我想做DPI還是不錯的選擇；