v1.0.0

v0.0.5
v0.0.4
2023-10-09 17:27:01 +08:00 · 2023-10-09 15:23:59 +08:00 · 2023-09-27 19:40:42 +08:00 · 2023-09-27 11:45:58 +08:00 · 2023-09-26 13:18:37 +08:00 · 2023-09-22 18:44:27 +08:00
44 changed files with 507410 additions and 1530 deletions
--- a/CMakeLists.txt.in
+++ b/CMakeLists.txt.in
@@ -0,0 +1,22 @@
+cmake_minimum_required(VERSION 2.8)
+project(libosfp)
+
+# 添加其他CMake配置
+
+# 生成RPM包
+set(CPACK_GENERATOR "RPM")
+set(CPACK_PACKAGE_NAME "libosfp")
+set(CPACK_PACKAGE_VENDOR "Geedge")
+set(CPACK_PACKAGE_DESCRIPTION_SUMMARY "Libosfp is a C library for OS fingerprinting.")
+set(CPACK_PACKAGE_VERSION "1.0.0")
+set(CPACK_PACKAGE_RELEASE 1)
+set(CPACK_PACKAGE_CONTACT "zhuzhenjun@geedgenetworks.com")
+
+set(CPACK_RPM_PACKAGE_AUTOREQPROV "no")
+
+install(DIRECTORY @prefix@/include DESTINATION . USE_SOURCE_PERMISSIONS)
+install(DIRECTORY @prefix@/lib/ DESTINATION ./lib64 USE_SOURCE_PERMISSIONS FILES_MATCHING PATTERN "libosfp*")
+install(DIRECTORY @prefix@/bin DESTINATION . USE_SOURCE_PERMISSIONS FILES_MATCHING PATTERN "osfp*")
+install(FILES fp.json DESTINATION /var/lib/libosfp)
+
+include(CPack)
--- a/2288
+++ b/2288
--- a/Makefile.am
+++ b/Makefile.am
@@ -1,2 +1,2 @@
-SUBDIRS = src example
+SUBDIRS = src example test
 ACLOCAL_AMFLAGS=-I m4
--- a/README.md
+++ b/README.md
@@ -1,4 +1,26 @@
 # libosfp

-Libosfp is a C libaray for OS fingerprinting.
+Libosfp is a C library for OS fingerprinting.

+## install
+
+```
+# osfp_example depends on libpcap
+yum install -y libpcap-devel
+# build and install
+./build.sh
+./package.sh
+yum install package/*.rpm
+```
+
+## library usage
+```
+gcc example/sample.c -o sample -losfp; cat example/sample.c
+```
+
+## run example
+
+```
+# load the fingerprint file and capture on eth0, filter tcp port 8888
+osfp_example -f /var/lib/libosfp/fp.json -i eth0 "tcp port 8888"
+```
--- a/build.sh
+++ b/build.sh
@@ -0,0 +1,6 @@
+#!/bin/bash
+
+./autogen.sh;
+./configure --prefix=$(pwd)/target;
+make -j
+make install
--- a/configure.ac
+++ b/configure.ac
@@ -1,4 +1,4 @@
-AC_INIT([libosfp],[0.0.0],[zhuzhenjun@geedgenetworks.com])
+AC_INIT([libosfp],[1.0.0],[zhuzhenjun@geedgenetworks.com])
 AM_INIT_AUTOMAKE([foreign])

 #m4_ifndef([AM_SILENT_RULES], [m4_define([AM_SILENT_RULES],[])])AM_SILENT_RULES([yes])
@@ -7,9 +7,12 @@ AC_CONFIG_MACRO_DIR([m4])
 AC_ARG_ENABLE([debug], [AS_HELP_STRING([--enable-debug], [enable debug info])], [enable_debug=$enableval], [enable_debug=no])

 AS_IF([test "x$enable_debug" = xyes],
-      [CFLAGS="-ggdb3 -O0"],
+      [CFLAGS="-DDEBUGLOG -ggdb3 -O0 -fsanitize=address -fno-omit-frame-pointer"],
      [CFLAGS="-g -O2"])

+AC_ARG_ENABLE([test], [AS_HELP_STRING([--enable-test], [enable test])], [enable_test=$enableval], [enable_test=yes])
+AS_IF([test "x$enable_test" = xyes],
+      [CFLAGS="${CFLAGS} -DUNITTEST"])

 AC_PROG_CC
 AC_PROG_CPP
@@ -19,5 +22,5 @@ AC_PROG_MAKE_SET
 AC_PROG_LIBTOOL


-AC_CONFIG_FILES([libosfp-config Makefile src/Makefile example/Makefile])
+AC_CONFIG_FILES([CMakeLists.txt libosfp-config Makefile src/Makefile example/Makefile test/Makefile])
 AC_OUTPUT
--- a/data.json
+++ b/data.json
--- a/example/Makefile.am
+++ b/example/Makefile.am
@@ -11,3 +11,4 @@ osfp_example_LDFLAGS = \

 osfp_example_CFLAGS = \
        -I../src
+
--- a/example/osfp_example.c
+++ b/example/osfp_example.c
@@ -14,10 +14,13 @@

 #include <pcap.h>

-#include "libosfp.h"
-#include "libosfp_fingerprint.h"
+#include "osfp_common.h"
+#include "osfp.h"
+#include "osfp_log.h"
+#include "osfp_fingerprint.h"
+#include "osfp_score_db.h"

-#define DEFAULT_FP_FILE "./fp.json"
+#define DEFAULT_FP_FILE_PATH "./fp.json"

 #define ETHERNET_HEADER_LEN     14
 #define VLAN_HEADER_LEN         4
@@ -131,6 +134,9 @@ typedef struct Packet_ {
    struct ipv6hdr *ip6h;
    struct tcphdr *tcph;

+    char srcip[46];
+    char dstip[46];
+
    Address src;
    Address dst;
    union {
@@ -154,7 +160,11 @@ typedef struct Packet_ {
 } Packet;


-unsigned char *fp_file;
+unsigned char *fp_file_path;
+unsigned char *fp_output_file_path;
+FILE *fingerprinting_output_fp;
+
+unsigned int debug_enable;
 unsigned char *if_name;
 unsigned char *pcap_file_name;
 unsigned char *bpf_string;
@@ -172,7 +182,7 @@ void usage(void) {
        "  -i iface  - listen on the specified network interface\n"
        "  -r file   - read offline pcap data from a given file\n"
        "  -f file   - read fingerprint database from 'file' (%s)\n",
-        DEFAULT_FP_FILE);
+        DEFAULT_FP_FILE_PATH);
    exit(1);
 }

@@ -427,90 +437,54 @@ const char *PrintInet(int af, const void *src, char *dst, socklen_t size)
    return NULL;
 }

-void example_header_match(libosfp_context_t *libosfp_context, Packet *p)
+void example_detect(struct osfp_db *osfp_db, Packet *p)
 {
-    // tcp/ip header match
    int ret;
    char str_buf[1024];
+    //unsigned char *iph = (unsigned char *)(p->iph != NULL ? (void *)p->iph : (void *)p->ip6h);
+    struct iphdr *iph;
+    struct ipv6hdr *ip6h;
+    struct tcphdr *tcph;
+    unsigned int tcph_len;
+    struct osfp_result *result = NULL;

-    unsigned char *iph = (unsigned char *)(p->iph != NULL ? (void *)p->iph : (void *)p->ip6h);
-    unsigned char *tcph = (unsigned char *)p->tcph;
-    libosfp_result_t result;
+    printf("Example ipv4 header detect: --------------------------\n");

-    printf("Example header match: --------------------------\n");
+    iph = (struct iphdr *)p->iph;
+    ip6h = (struct ipv6hdr *)p->ip6h;
+    tcph = (struct tcphdr *)p->tcph;
+    tcph_len = tcph->doff << 2;

-    ret = libosfp_header_match(libosfp_context, iph, tcph, &result);
-    if (ret != 0) {
-        printf("libosfp header match failed, erro: %s\n", "?");
+    if (iph) {
+        result = osfp_ipv4_identify(osfp_db, iph, tcph, tcph_len);
+    } else if (ip6h) {
+        result = osfp_ipv6_identify(osfp_db, ip6h, tcph, tcph_len);
+    } else {
        goto exit;
    }

-    char srcip[46] = {0}, dstip[46] = {0};
-    Port sp, dp;
-    if (p->iph) {
-        PrintInet(AF_INET, (const void *)&(p->src.addr_data32[0]), srcip, sizeof(srcip));
-        PrintInet(AF_INET, (const void *)&(p->dst.addr_data32[0]), dstip, sizeof(dstip));
-    } else if (p->ip6h) {
-        PrintInet(AF_INET6, (const void *)&(p->src.address), srcip, sizeof(srcip));
-        PrintInet(AF_INET6, (const void *)&(p->dst.address), dstip, sizeof(dstip));
+    if (result == NULL) {
+        printf("osfp header match failed, erro: %s\n", "?");
+        goto exit;
    }
-    sp = p->sp;
-    dp = p->dp;

-    printf("Connection info: %s:%d -> %s:%d\n", srcip, sp, dstip, dp);
-    printf("Most likely os class: %s\n", libosfp_result_likely_os_class_name_get(&result));
-    printf("Likely score: %u/100\n", libosfp_result_likely_os_class_score_get(&result));
+    printf("Connection info: %s:%d -> %s:%d\n", p->srcip, p->sp, p->dstip, p->dp);
+    printf("Most likely os class: %s\n", osfp_result_os_name_get(result));

-    libosfp_result_to_buf(&result, str_buf, sizeof(str_buf));
-    fprintf(stdout, "%s\n", str_buf);
+    printf("Details:\n");
+    printf("%s\n", osfp_result_score_detail_export(result));

 exit:
-    return;
-}
-
-void example_fingerprint_match(libosfp_context_t *libosfp_context, Packet *p)
-{
-    // fingerprint match
-    int ret;
-    char str_buf[1024];
-
-    unsigned char *iph = (unsigned char *)(p->iph != NULL ? (void *)p->iph : (void *)p->ip6h);
-    unsigned char *tcph = (unsigned char *)p->tcph;
-    libosfp_result_t result;
-    libosfp_fingerprint_t fp;
-
-    printf("Example fingerprint match: --------------------------\n");
-
-    ret = libosfp_fingerprinting(iph, tcph, &fp);
-    if (ret != 0) {
-        printf("libosfp fingerprinting failed\n");
-        goto exit;
+    if (result) {
+        osfp_result_free(result);
    }
-
-    libosfp_fingerprint_to_json_buf(&fp, str_buf, sizeof(str_buf));
-    fprintf(stdout, "%s\n", str_buf);
-
-    ret = libosfp_score_db_score(libosfp_context, &fp, &result);
-    if (ret != 0) {
-        printf("libosfp fingerprint score failed, error: %d\n", ret);
-        goto exit;
-    }
-
-    printf("Connection info: %s\n", "");
-    printf("Most likely os class: %s\n", libosfp_result_likely_os_class_name_get(&result));
-    printf("Likely score: %u/100\n", libosfp_result_likely_os_class_score_get(&result));
-
-    libosfp_result_to_buf(&result, str_buf, sizeof(str_buf));
-    fprintf(stdout, "%s\n", str_buf);
-
-exit:
    return;
 }

 void process_packet(char *user, struct pcap_pkthdr *h, u_char *pkt)
 {
    int ret;
-    libosfp_context_t *libosfp_context = (libosfp_context_t *)user;
+    struct osfp_db *osfp_db = (struct osfp_db *)user;
    Packet  packet = {0}, *p = &packet;

    // decode packet
@@ -520,13 +494,26 @@ void process_packet(char *user, struct pcap_pkthdr *h, u_char *pkt)
    }

    // only for tcp syn request packet
-    if (!p->tcph->syn || p->tcph->ack) {
+    if (!p->tcph->syn) {
        goto exit;
    }

-    example_header_match(libosfp_context, p);
+    if (p->tcph->ack) {
+        printf("---------------------------  SYN/ACK\n");
+    } else {
+        printf("---------------------------  SYN\n");
+    }

-    example_fingerprint_match(libosfp_context, p);
+    if (p->iph) {
+        PrintInet(AF_INET, (const void *)&(p->src.addr_data32[0]), p->srcip, sizeof(p->srcip));
+        PrintInet(AF_INET, (const void *)&(p->dst.addr_data32[0]), p->dstip, sizeof(p->dstip));
+    } else if (p->ip6h) {
+        PrintInet(AF_INET6, (const void *)&(p->src.address), p->srcip, sizeof(p->srcip));
+        PrintInet(AF_INET6, (const void *)&(p->dst.address), p->dstip, sizeof(p->dstip));
+    }
+
+    // tcp/ip header detect example for user
+    example_detect(osfp_db, p);

    printf("---------------------------    processed packet count %d\n", ++processed_packet);

@@ -538,14 +525,14 @@ int main(int argc, char *argv[])
 {
    int r;

-    while ((r = getopt(argc, argv, "+f:i:r:")) != -1) {
+    while ((r = getopt(argc, argv, "+f:i:r:o:d")) != -1) {
        switch(r) {
            case 'f':
-                if (fp_file) {
+                if (fp_file_path) {
                    printf("Multiple -f options not supported.\n");
                    exit(1);
                }
-                fp_file = (unsigned char*)optarg;
+                fp_file_path = (unsigned char*)optarg;
                break;
            case 'i':
                if (if_name) {
@@ -561,6 +548,16 @@ int main(int argc, char *argv[])
                }
                pcap_file_name = (unsigned char*)optarg;
                break;
+            case 'o':
+                if (fp_output_file_path) {
+                    printf("Multiple -o options not supported.\n");
+                    exit(1);
+                }
+                fp_output_file_path = (unsigned char*)optarg;
+                break;
+            case 'd':
+                debug_enable = 1;
+                break;
            default:
                usage();
                break;
@@ -576,6 +573,15 @@ int main(int argc, char *argv[])
        }
    }

+    // fingerprinting out file create
+    if (fp_output_file_path) {
+        fingerprinting_output_fp = fopen(fp_output_file_path, "a+");
+        if (!fingerprinting_output_fp) {
+            printf("No such file: %s\n", fp_output_file_path);
+            exit(1);
+        }
+    }
+
    // prepare pcap handle

    char pcap_err[PCAP_ERRBUF_SIZE];
@@ -620,35 +626,34 @@ int main(int argc, char *argv[])
    // get link type
    link_type = pcap_datalink(pcap_handle);

-    // create libosfp context
-    if (fp_file == NULL) {
-        fp_file = DEFAULT_FP_FILE;
+    // create osfp db
+    if (fp_file_path == NULL) {
+        fp_file_path = DEFAULT_FP_FILE_PATH;
    }

-    libosfp_context_t *libosfp_context = libosfp_context_create(fp_file);
-    if (libosfp_context == NULL) {
-        printf("could not create libosfp context. fingerprints file: %s\n", fp_file);
+    if (debug_enable) {
+        osfp_log_level_set(OSFP_LOG_LEVEL_DEBUG);
+    }
+
+    struct osfp_db *osfp_db = osfp_db_new(fp_file_path);
+    if (osfp_db == NULL) {
+        printf("could not create osfp context. fingerprints file: %s\n", fp_file_path);
        exit(1);
    }

-    // setup libosfp context
-    r = libosfp_context_setup(libosfp_context);
-    if (r != LIBOSFP_NOERR) {
-        printf("could not setup libosfp context. error: %d\n", LIBOSFP_NOERR);
-        exit(1);
-    }
+    osfp_score_db_debug_print(osfp_db->score_db);

    // loop
    while (1) {
-        int r = pcap_dispatch(pcap_handle, 0, (pcap_handler)process_packet, (void*)libosfp_context);    
+        int r = pcap_dispatch(pcap_handle, 0, (pcap_handler)process_packet, (void*)osfp_db);    
        if (r < 0) {
            printf("error code: %d, error: %s\n", r, pcap_geterr(pcap_handle));
            break;
        }
    }

-    // create libosfp context
-    libosfp_context_destroy(libosfp_context);
+    // destroy osfp db
+    osfp_db_free(osfp_db);

    return 0;
 }
--- a/example/sample.c
+++ b/example/sample.c
@@ -0,0 +1,35 @@
+#include "stdio.h" 
+#include "libosfp/osfp.h" 
+ 
+char iph[] = { 
+  0x45, 0x00, 0x00, 0x34, 0x51, 0xc4, 0x40, 0x00, 
+  0x80, 0x06, 0xe7, 0x27, 0xc0, 0xa8, 0x73, 0x08, 
+  0x6a, 0xb9, 0x23, 0x6e 
+}; 
+ 
+char tcph[] = { 
+  0xc1, 0xbd, 0x00, 0x50, 0x3d, 0x58, 0x51, 0x60, 
+  0x00, 0x00, 0x00, 0x00, 0x80, 0x02, 0x20, 0x00, 
+  0x3d, 0x3a, 0x00, 0x00, 0x02, 0x04, 0x04, 0xec, 
+  0x01, 0x03, 0x03, 0x08, 0x01, 0x01, 0x04, 0x02 
+};  
+ 
+int main(int argc, char **argv) 
+{ 
+    const char *json_file_path = "./fp.json";
+ 
+    struct iphdr *l3_hdr = (struct iphdr *)iph; 
+    struct tcphdr *l4_hdr = (struct tcphdr *)tcph; 
+    size_t l4_hdr_len = sizeof(tcph); 
+ 
+    struct osfp_db *db = osfp_db_new(json_file_path); 
+    if (db) {
+        struct osfp_result *result = osfp_ipv4_identify(db, l3_hdr, l4_hdr, l4_hdr_len); 
+        if (result) { 
+            printf("likely os: %s\n", osfp_result_os_name_get(result)); 
+            printf("details: \n%s\n", osfp_result_score_detail_export(result)); 
+            osfp_result_free(result);
+            osfp_db_free(db); 
+        } 
+    }
+}
--- a/fp.json
+++ b/fp.json
--- a/package.sh
+++ b/package.sh
@@ -0,0 +1,8 @@
+#!/bin/bash
+
+rm -rf package
+mkdir package
+cd package
+cmake ..
+cpack
+cd -
--- a/pcap/linux_ipv4_syn.pcap
+++ b/pcap/linux_ipv4_syn.pcap
--- a/pcap/linux_ipv4_syn_ack.pcap
+++ b/pcap/linux_ipv4_syn_ack.pcap
--- a/pcap/test.pcap
+++ b/pcap/test.pcap
--- a/pcap/unknown_ipv6_syn.pcap
+++ b/pcap/unknown_ipv6_syn.pcap
--- a/pcap/unknown_ipv6_syn_ack.pcap
+++ b/pcap/unknown_ipv6_syn_ack.pcap
--- a/pcap/windows_ipv4_syn.pcap
+++ b/pcap/windows_ipv4_syn.pcap
--- a/pcap/windows_ipv6_malformed.pcap
+++ b/pcap/windows_ipv6_malformed.pcap
--- a/pcap/windows_ipv6_syn_ack.pcap
+++ b/pcap/windows_ipv6_syn_ack.pcap
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -9,11 +9,15 @@ libosfp_la_SOURCES = \
        utstring.h \
        cJSON.h \
        cJSON.c \
-        libosfp.h \
-        libosfp.c \
-        libosfp_fingerprint.h \
-        libosfp_fingerprint.c \
-        libosfp_score_db.h \
-        libosfp_score_db.c
+        osfp_common.h \
+        osfp_common.c \
+        osfp.h \
+        osfp.c \
+        osfp_fingerprint.h \
+        osfp_fingerprint.c \
+        osfp_log.h \
+        osfp_log.c \
+        osfp_score_db.h \
+        osfp_score_db.c

-pkginclude_HEADERS = libosfp.h libosfp_fingerprint.h
+pkginclude_HEADERS = osfp.h osfp_fingerprint.h osfp_score_db.h osfp_common.h
--- a/src/libosfp.c
+++ b/src/libosfp.c
@@ -1,207 +0,0 @@
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-#include <malloc.h>
-
-#include <linux/in.h>
-#include <linux/if_ether.h>
-#include <linux/ip.h>
-#include <linux/ipv6.h>
-#include <linux/tcp.h>
-
-#include "libosfp.h"
-#include "libosfp_fingerprint.h"
-#include "libosfp_score_db.h"
-#include "libosfp_log.h"
-
-#define LIBOSFP_OS_CLASS_NAME_WINDOWS   "Windows"
-#define LIBOSFP_OS_CLASS_NAME_LINUX     "Linux"
-#define LIBOSFP_OS_CLASS_NAME_MAC_OS    "Mac OS"
-#define LIBOSFP_OS_CLASS_NAME_IOS       "iOS"
-#define LIBOSFP_OS_CLASS_NAME_ANDROID   "Android"
-
-#define LIBOSFP_WRITE_STRING_TO_BUF(ret, buf, size, off, ...) do {      \
-        ret = snprintf((char *)buf + off,                               \
-                          size - off,                                   \
-                          __VA_ARGS__);                                 \
-        if (ret >= 0) {                                                 \
-            if ( (off + ret) >= size) {                                 \
-                off = size - 1;                                         \
-            } else {                                                    \
-                off += ret;                                             \
-            }                                                           \
-        }                                                               \
-    } while (0)
-
-
-const char *os_class_name[LIBOSFP_OS_CLASS_MAX] = {
-    LIBOSFP_OS_CLASS_NAME_WINDOWS,
-    LIBOSFP_OS_CLASS_NAME_LINUX,
-    LIBOSFP_OS_CLASS_NAME_MAC_OS,
-    LIBOSFP_OS_CLASS_NAME_IOS,
-    LIBOSFP_OS_CLASS_NAME_ANDROID
-};
-
-libosfp_os_class_id_t libosfp_os_class_name_to_id(char *name)
-{
-    libosfp_os_class_id_t os_class;
-
-    if (0 == strncmp(name, LIBOSFP_OS_CLASS_NAME_WINDOWS, strlen(LIBOSFP_OS_CLASS_NAME_WINDOWS))) {
-        os_class = LIBOSFP_OS_CLASS_WINDOWS;
-    } else if (0 == strncmp(name, LIBOSFP_OS_CLASS_NAME_LINUX, strlen(LIBOSFP_OS_CLASS_NAME_LINUX))) {
-        os_class = LIBOSFP_OS_CLASS_Linux;
-    } else if (0 == strncmp(name, LIBOSFP_OS_CLASS_NAME_MAC_OS, strlen(LIBOSFP_OS_CLASS_NAME_MAC_OS))) {
-        os_class = LIBOSFP_OS_CLASS_MAC_OS;
-    } else if (0 == strncmp(name, LIBOSFP_OS_CLASS_NAME_IOS, strlen(LIBOSFP_OS_CLASS_NAME_IOS))) {
-        os_class = LIBOSFP_OS_CLASS_IOS;
-    } else if (0 == strncmp(name, LIBOSFP_OS_CLASS_NAME_ANDROID, strlen(LIBOSFP_OS_CLASS_NAME_ANDROID))) {
-        os_class = LIBOSFP_OS_CLASS_ANDROID;
-    } else {
-        os_class = LIBOSFP_OS_CLASS_MAX;
-    }
-
-    return os_class;
-}
-
-const char *libosfp_os_class_id_to_name(libosfp_os_class_id_t os_class)
-{
-    if (os_class < 0 || os_class >= LIBOSFP_OS_CLASS_MAX) {
-        return NULL;
-    }
-
-    return os_class_name[os_class];
-}
-
-const char *libosfp_result_likely_os_class_name_get(libosfp_result_t *result)
-{
-    libosfp_os_class_id_t os_class;
-
-    if (result == NULL) {
-        return NULL;
-    }
-
-    os_class = result->likely_os_class;
-    if (os_class < 0 || os_class >= LIBOSFP_OS_CLASS_MAX) {
-        return NULL;
-    }
-
-    return os_class_name[os_class];
-}
-
-unsigned int libosfp_result_likely_os_class_score_get(libosfp_result_t *result)
-{
-    if (result == NULL) {
-        return 0;
-    }
-
-    return result->likely_score;
-}
-
-int libosfp_result_to_buf(libosfp_result_t *result, char *strbuf, unsigned int buf_len)
-{
-    int ret, offset = 0, i;
-
-    if (result == NULL || strbuf == NULL || buf_len == 0) {
-        return 0;
-    }
-
-    LIBOSFP_WRITE_STRING_TO_BUF(ret, strbuf, buf_len, offset,
-                        "Most likely os class: %s\nLikely score: %u/100\n",
-                        os_class_name[result->likely_os_class], result->likely_score);
-
-    LIBOSFP_WRITE_STRING_TO_BUF(ret, strbuf, buf_len, offset,"Details:\n");
-
-    for (i = 0; i < LIBOSFP_OS_CLASS_MAX; i++) {
-        LIBOSFP_WRITE_STRING_TO_BUF(ret, strbuf, buf_len, offset,"%s score: %u\n",
-                        os_class_name[i], result->score.os_class_score[i]);
-    }
-
-exit:
-    return offset;
-}
-
-libosfp_error_code_t libosfp_header_match(libosfp_context_t *libosfp_context, unsigned char *ip_hdr, unsigned char *tcp_hdr, libosfp_result_t *result)
-{
-    int ret = LIBOSFP_EINVAL;
-    libosfp_fingerprint_t fp = {0};
-
-    if (libosfp_context == NULL || ip_hdr == NULL || tcp_hdr == NULL || result == NULL) {
-        goto exit;
-    }
-
-    ret = libosfp_fingerprinting(ip_hdr, tcp_hdr, &fp);
-    if (ret != 0) {
-        goto exit;
-    }
-
-    ret = libosfp_score_db_score(libosfp_context, &fp, result);
-    if (ret != 0) {
-        goto exit;
-    }
-
-    return LIBOSFP_NOERR;
-exit:
-    return ret;
-}
-
-libosfp_error_code_t libosfp_context_setup(libosfp_context_t *libosfp_context)
-{
-    int ret = LIBOSFP_EINVAL;
-
-    if (libosfp_context == NULL) {
-        goto exit;
-    }
-
-    ret = libosfp_score_db_load((libosfp_score_db_t *)libosfp_context->score_db, libosfp_context->fp_file);
-    if (ret != LIBOSFP_NOERR) {
-        goto exit;
-    }
-
-    return LIBOSFP_NOERR;
-exit:
-    return ret;
-}
-
-libosfp_context_t *libosfp_context_create(char *fp_file)
-{
-    libosfp_context_t *libosfp_context = NULL;
-
-    if (fp_file == NULL || 0 != access(fp_file, R_OK)) {
-        goto exit;
-    }
-
-    libosfp_context = malloc(sizeof(libosfp_context_t));
-    if (libosfp_context == NULL) {
-        goto exit;
-    }
-
-    libosfp_context->fp_file = strdup((const char*)fp_file);
-    if (libosfp_context->fp_file == NULL) {
-        goto exit;
-    }
-
-    libosfp_context->score_db = (void *)libosfp_score_db_create();
-    if (libosfp_context->score_db == NULL) {
-        goto exit;
-    }
-
-    return libosfp_context;
-exit:
-    if (libosfp_context) {
-        libosfp_context_destroy(libosfp_context);
-    }
-    return NULL;
-}
-
-void libosfp_context_destroy(libosfp_context_t *libosfp_context)
-{
-    if (libosfp_context) {
-        if (libosfp_context->fp_file) {
-            free(libosfp_context->fp_file);
-        }
-        if (libosfp_context->score_db) {
-            libosfp_score_db_destroy(libosfp_context->score_db);
-        }
-        free(libosfp_context);
-    }
-}
--- a/src/libosfp.h
+++ b/src/libosfp.h
@@ -1,50 +0,0 @@
-#ifndef __LIBOSFP_H__
-#define __LIBOSFP_H__
-
-typedef enum libosfp_error_code {
-    LIBOSFP_NOERR,
-    LIBOSFP_EINVAL,
-    LIBOSFP_ERR_READ_FILE,
-    LIBOSFP_ERR_PARSE_FILE,
-} libosfp_error_code_t;
-
-typedef enum libosfp_os_class_id {
-    LIBOSFP_OS_CLASS_WINDOWS,
-    LIBOSFP_OS_CLASS_Linux,
-    LIBOSFP_OS_CLASS_MAC_OS,
-    LIBOSFP_OS_CLASS_IOS,
-    LIBOSFP_OS_CLASS_ANDROID,
-    LIBOSFP_OS_CLASS_MAX,
-} libosfp_os_class_id_t;
-
-typedef struct libosfp_score {
-    unsigned int os_class_score[LIBOSFP_OS_CLASS_MAX];
-} libosfp_score_t;
-
-typedef struct libosfp_result {
-    enum libosfp_error_code     err;
-    enum libosfp_os_class_id    likely_os_class; // top rated os class
-    unsigned int                likely_score;
-    unsigned int                perfect_score;
-    libosfp_score_t             score;
-} libosfp_result_t;
-
-typedef struct libosfp_context {
-    char *fp_file;
-    void *score_db;
-} libosfp_context_t;
-
-
-libosfp_os_class_id_t libosfp_os_class_name_to_id(char *name);
-const char *libosfp_os_class_id_to_name(libosfp_os_class_id_t os_class);
-
-int libosfp_result_to_buf(libosfp_result_t *result, char *strbuf, unsigned int buf_len);
-unsigned int libosfp_result_likely_os_class_score_get(libosfp_result_t *result);
-const char *libosfp_result_likely_os_class_name_get(libosfp_result_t *result);
-
-libosfp_error_code_t libosfp_header_match(libosfp_context_t *libosfp_context, unsigned char *ip_hdr, unsigned char *tcp_hdr, libosfp_result_t *result);
-libosfp_error_code_t libosfp_context_setup(libosfp_context_t *libosfp_context);
-libosfp_context_t *libosfp_context_create(char *fp_file);
-void libosfp_context_destroy(libosfp_context_t *libosfp_context);
-
-#endif
--- a/src/libosfp_fingerprint.c
+++ b/src/libosfp_fingerprint.c
@@ -1,415 +0,0 @@
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-#include <malloc.h>
-
-#include <linux/in.h>
-#include <linux/if_ether.h>
-#include <linux/ip.h>
-#include <linux/ipv6.h>
-#include <linux/tcp.h>
-
-#include "cJSON.h"
-
-#include "libosfp.h"
-#include "libosfp_fingerprint.h"
-#include "libosfp_log.h"
-
-#define LIBOSFP_ETHERNET_HEADER_LEN     14
-#define LIBOSFP_VLAN_HEADER_LEN         4
-#define LIBOSFP_IPV4_HEADER_LEN         20
-#define LIBOSFP_IPV6_HEADER_LEN         40
-#define LIBOSFP_TCP_HEADER_LEN          20
-
-#define LIBOSFP_FINGERPRINT_FIELD_NAME_IP_ID                "ip_id"
-#define LIBOSFP_FINGERPRINT_FIELD_NAME_IP_TOS               "ip_tos"
-#define LIBOSFP_FINGERPRINT_FIELD_NAME_IP_TOTAL_LENGHT      "ip_total_length"
-#define LIBOSFP_FINGERPRINT_FIELD_NAME_IP_TTL               "ip_ttl"
-#define LIBOSFP_FINGERPRINT_FIELD_NAME_TCP_OFF              "tcp_off"
-#define LIBOSFP_FINGERPRINT_FIELD_NAME_TCP_TIMESTAMP        "tcp_timestamp"
-#define LIBOSFP_FINGERPRINT_FIELD_NAME_TCP_TIMESTAMP_ECHO_REPLY "tcp_timestamp_echo_reply"
-#define LIBOSFP_FINGERPRINT_FIELD_NAME_TCP_WINDOW_WCALING   "tcp_window_scaling"
-#define LIBOSFP_FINGERPRINT_FIELD_NAME_TCP_WINDOW_SIZE      "tcp_window_size"
-#define LIBOSFP_FINGERPRINT_FIELD_NAME_TCP_FLAGS            "tcp_flags"
-#define LIBOSFP_FINGERPRINT_FIELD_NAME_TCP_MSS              "tcp_mss"
-#define LIBOSFP_FINGERPRINT_FIELD_NAME_TCP_OPTIONS          "tcp_options"
-#define LIBOSFP_FINGERPRINT_FIELD_NAME_TCP_OPTIONS_ORDERED  "tcp_options_ordered"
-#define LIBOSFP_FINGERPRINT_FIELD_NAME_OS                   "os"
-
-
-typedef struct libosfp_tcp_opt {
-    unsigned char type;
-    unsigned char len;
-    const unsigned char *data;
-} libosfp_tcp_opt_t;
-
-libosfp_fingerprint_field_t fp_fields[LIBOSFP_FIELD_MAX] = {
-    {LIBOSFP_FINGERPRINT_FIELD_NAME_IP_ID,                   1, LIBOSFP_FIELD_TYPE_UINT,    150,    NULL,    0},
-    {LIBOSFP_FINGERPRINT_FIELD_NAME_IP_TOS,                  1, LIBOSFP_FIELD_TYPE_UINT,    25,     NULL,    0},
-    {LIBOSFP_FINGERPRINT_FIELD_NAME_IP_TOTAL_LENGHT,         1, LIBOSFP_FIELD_TYPE_UINT,    250,    NULL,    0},
-    {LIBOSFP_FINGERPRINT_FIELD_NAME_IP_TTL,                  1, LIBOSFP_FIELD_TYPE_UINT,    200,    NULL,    0},
-    {LIBOSFP_FINGERPRINT_FIELD_NAME_TCP_OFF,                 1, LIBOSFP_FIELD_TYPE_UINT,    250,    NULL,    0},
-    {LIBOSFP_FINGERPRINT_FIELD_NAME_TCP_TIMESTAMP,           0, LIBOSFP_FIELD_TYPE_UINT,    0,      NULL,    0},
-    {LIBOSFP_FINGERPRINT_FIELD_NAME_TCP_TIMESTAMP_ECHO_REPLY,1, LIBOSFP_FIELD_TYPE_UINT,    200,    NULL,    0},
-    {LIBOSFP_FINGERPRINT_FIELD_NAME_TCP_WINDOW_WCALING,      1, LIBOSFP_FIELD_TYPE_UINT,    200,    NULL,    0},
-    {LIBOSFP_FINGERPRINT_FIELD_NAME_TCP_WINDOW_SIZE,         1, LIBOSFP_FIELD_TYPE_UINT,    200,    NULL,    0},
-    {LIBOSFP_FINGERPRINT_FIELD_NAME_TCP_FLAGS,               1, LIBOSFP_FIELD_TYPE_UINT,    25,     NULL,    0},
-    {LIBOSFP_FINGERPRINT_FIELD_NAME_TCP_MSS,                 1, LIBOSFP_FIELD_TYPE_UINT,    150,    NULL,    0},
-    {LIBOSFP_FINGERPRINT_FIELD_NAME_TCP_OPTIONS,             1, LIBOSFP_FIELD_TYPE_STRING,  400,    NULL,    0},
-    {LIBOSFP_FINGERPRINT_FIELD_NAME_TCP_OPTIONS_ORDERED,     1, LIBOSFP_FIELD_TYPE_STRING,  250,    NULL,    0},
-    {LIBOSFP_FINGERPRINT_FIELD_NAME_OS,                      0, LIBOSFP_FIELD_TYPE_STRING,  0,      NULL,    0},
-};
-
-static char option_to_ascii(unsigned char type)
-{
-    switch (type) {
-        case LIBOSFP_TCP_OPT_EOL:
-            return 'E';
-        case LIBOSFP_TCP_OPT_NOP:
-            return 'N';
-        case LIBOSFP_TCP_OPT_MSS:
-            return 'M';
-        case LIBOSFP_TCP_OPT_WSCALE:
-            return 'W';
-        case LIBOSFP_TCP_OPT_SACKOK:
-            return 'S';
-        case LIBOSFP_TCP_OPT_SACK:
-            return 'K';
-        case LIBOSFP_TCP_OPT_ECHO:
-            return 'J';
-        case LIBOSFP_TCP_OPT_ECHOREPLY:
-            return 'F';
-        case LIBOSFP_TCP_OPT_TIMESTAMP:
-            return 'T';
-        case LIBOSFP_TCP_OPT_POCONN:
-            return 'P';
-        case LIBOSFP_TCP_OPT_POSVC:
-            return 'R';
-        default:
-            return 'U';
-    }
-}
-
-static unsigned int compute_ip_ttl(unsigned int ip_ttl)
-{
-    if (ip_ttl >= 0 && ip_ttl <= 32) {
-        ip_ttl = 32;
-    } else if (ip_ttl > 32 && ip_ttl <= 64) {
-        ip_ttl = 64;
-    } else if (ip_ttl > 64 && ip_ttl <= 128) {
-        ip_ttl = 128;
-    } else if (ip_ttl > 128) {
-        ip_ttl = 255;
-    }
-    return ip_ttl;
-}
-
-static unsigned int decode_tcp_options(libosfp_tcp_opt_t *tcp_opts, unsigned int max_opt_cnt, unsigned char *data, unsigned int len)
-{
-    unsigned int offset = 0;
-    unsigned int tcp_opt_cnt = 0;
-
-    while (offset < len && tcp_opt_cnt < max_opt_cnt) {
-        unsigned char type;
-        unsigned char olen;
-        unsigned char *odata;
-
-        type = *(data + offset);
-
-        if (type == LIBOSFP_TCP_OPT_EOL || type == LIBOSFP_TCP_OPT_NOP) {
-            olen = 1;
-        } else {
-            olen = *(data + offset + 1);
-            if (olen < 2) {
-                break;
-            }
-        }
-
-        if (offset + olen > len) {
-            break;
-        }
-
-        odata = (olen > 2) ? (data + offset + 2) : NULL;
-
-        tcp_opts[tcp_opt_cnt].type = type;
-        tcp_opts[tcp_opt_cnt].len = olen;
-        tcp_opts[tcp_opt_cnt].data = odata;
-
-        offset += olen;
-        tcp_opt_cnt++;
-    }
-    return tcp_opt_cnt;
-}
-
-int libosfp_fingerprint_to_json_buf(libosfp_fingerprint_t *fp, char *strbuf, unsigned int buf_len)
-{
-    int rlen = 0, ret, i;
-    cJSON *root;
-
-    if (fp == NULL || strbuf == NULL || buf_len == 0) {
-        return 0;
-    }
-
-    root = cJSON_CreateObject();
-    if (root == NULL) {
-        return 0;
-    }
-
-    for (i = 0; i < LIBOSFP_FIELD_MAX; i++) {
-        if (fp->fields[i].enabled) {
-            switch (fp_fields[i].type) {
-                case LIBOSFP_FIELD_TYPE_UINT:
-                    cJSON_AddNumberToObject(root, fp_fields[i].name, *(unsigned int *)fp->fields[i].value);
-                break;
-                case LIBOSFP_FIELD_TYPE_STRING:
-                    cJSON_AddStringToObject(root, fp_fields[i].name, (char *)fp->fields[i].value);
-                    break;
-                default:
-                    break;
-            }
-        } else {
-            cJSON_AddNullToObject(root, fp_fields[i].name);
-        }
-    }
-
-    if (!cJSON_PrintPreallocated(root, strbuf, buf_len, 1)) {
-        return 0;
-    }
-
-    cJSON_Delete(root);
-
-    return strlen(strbuf) + 1;
-}
-
-unsigned int libosfp_fingerprint_get_field_enabled(libosfp_field_id_t field_id)
-{
-    return fp_fields[field_id].enabled;
-}
-
-unsigned int libosfp_fingerprint_get_field_importance(libosfp_field_id_t field_id)
-{
-    return fp_fields[field_id].importance;
-}
-
-char *libosfp_fingerprint_get_field_name(libosfp_field_id_t field_id)
-{
-    return fp_fields[field_id].name;
-}
-
-unsigned int libosfp_fingerprint_get_field_type(libosfp_field_id_t field_id)
-{
-    return fp_fields[field_id].type;
-}
-
-void libosfp_fingerprint_setup_field(libosfp_fingerprint_t *fp, libosfp_field_id_t field_id, void *value, unsigned int len)
-{
-    fp->fields[field_id].name = libosfp_fingerprint_get_field_name(field_id);
-    fp->fields[field_id].enabled = 1;
-
-    if (fp->value_buffer_used + len <= sizeof(fp->value_buffer)) {
-        memcpy(fp->value_buffer + fp->value_buffer_used, value, len);
-        fp->fields[field_id].value = fp->value_buffer + fp->value_buffer_used;
-        fp->fields[field_id].value_len = len;
-        fp->value_buffer_used += len;
-    } else {
-        fp->fields[field_id].value = NULL;
-        fp->fields[field_id].value_len = 0;
-    }
-}
-
-void libosfp_fingerprinting_tcp_option(unsigned char *pkt, unsigned int pktlen, libosfp_fingerprint_t *fp)
-{
-    int ret,i;
-    char options[LIBOSFP_TCP_OPTLENMAX];
-    char options_ordered[LIBOSFP_TCP_OPTLENMAX];
-    unsigned int maxoffset = sizeof(options) - 3;
-    unsigned int ordered_maxoffset = sizeof(options_ordered) - 1;
-    unsigned int offset = 0;
-    unsigned int ordered_offset = 0;
-
-    unsigned int tcp_mss;
-    unsigned int tcp_ws;
-    unsigned int tcp_ter;
-    unsigned int tcp_opt_cnt;
-    libosfp_tcp_opt_t tcp_opts[LIBOSFP_TCP_OPTMAX];
-
-    tcp_opt_cnt = decode_tcp_options(tcp_opts, LIBOSFP_TCP_OPTMAX, pkt, pktlen);
-
-    for (i = 0; i < tcp_opt_cnt && offset < maxoffset && ordered_offset < ordered_maxoffset; i++) {
-        libosfp_tcp_opt_t *opt = &tcp_opts[i];
-
-        char letter = option_to_ascii(opt->type);
-        options[offset++] = letter;
-        options_ordered[ordered_offset++] = letter;
-
-        switch (opt->type) {
-            case LIBOSFP_TCP_OPT_EOL:
-            case LIBOSFP_TCP_OPT_NOP:
-                break;
-            case LIBOSFP_TCP_OPT_MSS:
-                if (opt->len != LIBOSFP_TCP_OPT_MSS_LEN) {
-                    break;
-                }
-                tcp_mss = (unsigned int)ntohs(*(unsigned short *)opt->data);
-                libosfp_fingerprint_setup_field(fp, LIBOSFP_FIELD_TCP_MSS, &tcp_mss, sizeof(tcp_mss));
-                ret = snprintf(options + offset, sizeof(options), "%u", tcp_mss);
-                if (ret < 0 || offset + ret > maxoffset) {
-                    break;
-                }
-                offset += ret;
-                break;
-            case LIBOSFP_TCP_OPT_WSCALE:
-                if (opt->len != LIBOSFP_TCP_OPT_WS_LEN) {
-                    break;
-                }
-                tcp_ws = (unsigned int)*(unsigned char *)opt->data;
-                libosfp_fingerprint_setup_field(fp, LIBOSFP_FIELD_TCP_WINDOW_SCALING, &tcp_ws, sizeof(tcp_ws));
-                ret = snprintf(options + offset, sizeof(options), "%u", tcp_ws);
-                if (ret < 0 || offset + ret > maxoffset) {
-                    break;
-                }
-                offset += ret;
-                break;
-            case LIBOSFP_TCP_OPT_TIMESTAMP:
-                if (opt->len != LIBOSFP_TCP_OPT_TS_LEN) {
-                    break;
-                }
-                tcp_ter = ntohl(*(unsigned int *)(opt->data + 4));
-                libosfp_fingerprint_setup_field(fp, LIBOSFP_FIELD_TCP_TIMESTAMP_ECHO_REPLY, &tcp_ter, sizeof(tcp_ter));
-                ret = snprintf(options + offset, sizeof(options), "%u", tcp_ter);
-                if (ret < 0 || offset + ret > maxoffset) {
-                    break;
-                }
-                offset += ret;
-                break;
-            case LIBOSFP_TCP_OPT_SACKOK:
-            case LIBOSFP_TCP_OPT_SACK:
-            case LIBOSFP_TCP_OPT_ECHO:
-            case LIBOSFP_TCP_OPT_ECHOREPLY:
-            case LIBOSFP_TCP_OPT_POCONN:
-            case LIBOSFP_TCP_OPT_POSVC:
-                break;
-            default:
-                ret = snprintf(options + offset, sizeof(options), "%u", opt->type);
-                if (ret < 0 || offset + ret > maxoffset) {
-                    break;
-                }
-                offset += ret;
-        }
-
-        options[offset++] = ',';
-        options[offset] = 0;
-        options_ordered[ordered_offset] = 0;
-    }
-
-    libosfp_fingerprint_setup_field(fp, LIBOSFP_FIELD_TCP_OPTIONS, options, strlen(options) + 1);
-    libosfp_fingerprint_setup_field(fp, LIBOSFP_FIELD_TCP_OPTIONS_ORDERED, options_ordered, strlen(options_ordered) + 1);
-
-    return;
-}
-
-int libosfp_fingerprinting_tcp(struct tcphdr *tcph, libosfp_fingerprint_t *fp)
-{
-    if (tcph == NULL || fp == NULL) {
-        goto exit;
-    }
-
-    unsigned int tcp_off = tcph->doff << 2;
-    unsigned int tcp_window_size = ntohs(tcph->window);
-    unsigned int tcp_flags = *((unsigned char *)&tcph->window - 1);
-
-    libosfp_fingerprint_setup_field(fp, LIBOSFP_FIELD_TCP_OFF, &tcp_off, sizeof(tcp_off));
-    libosfp_fingerprint_setup_field(fp, LIBOSFP_FIELD_TCP_WINDOW_SIZE, &tcp_window_size, sizeof(tcp_window_size));
-    libosfp_fingerprint_setup_field(fp, LIBOSFP_FIELD_TCP_FLAGS, &tcp_flags, sizeof(tcp_flags));
-
-    // tcp options
-    if (tcp_off > LIBOSFP_TCP_HEADER_LEN) {
-        libosfp_fingerprinting_tcp_option((unsigned char *)tcph + LIBOSFP_TCP_HEADER_LEN, tcp_off - LIBOSFP_TCP_HEADER_LEN, fp);
-    }
-
-    return 0;
-exit:
-    return -1;
-}
-
-int libosfp_fingerprinting_ipv4(struct iphdr *iph, libosfp_fingerprint_t *fp)
-{
-    if (iph == NULL || fp == NULL) {
-        goto exit;
-    }
-
-    unsigned int ip_id = !!iph->id;
-    unsigned int ip_tos = iph->tos;
-    unsigned int ip_total_length = ntohs(iph->tot_len);
-    unsigned int ip_ttl = compute_ip_ttl(iph->ttl);
-
-    libosfp_fingerprint_setup_field(fp, LIBOSFP_FIELD_IP_ID, &ip_id, sizeof(ip_id));
-    libosfp_fingerprint_setup_field(fp, LIBOSFP_FIELD_IP_TOS, &ip_tos, sizeof(ip_tos));
-    libosfp_fingerprint_setup_field(fp, LIBOSFP_FIELD_IP_TOTAL_LENGTH, &ip_total_length, sizeof(ip_total_length));
-    libosfp_fingerprint_setup_field(fp, LIBOSFP_FIELD_IP_TTL, &ip_ttl, sizeof(ip_ttl));
-
-    return 0;
-exit:
-    return -1;
-}
-
-int libosfp_fingerprinting_ipv6(struct ipv6hdr *iph, libosfp_fingerprint_t *fp)
-{
-    if (iph == NULL || fp == NULL) {
-        goto exit;
-    }
-
-    //unsigned int ip_id = 0;
-    //unsigned int ip_tos = 0;
-    unsigned int ip_total_length = LIBOSFP_IPV6_HEADER_LEN + ntohs(iph->payload_len);
-    unsigned int ip_ttl = compute_ip_ttl(iph->hop_limit);
-
-    //libosfp_fingerprint_setup_field(fp, LIBOSFP_FIELD_IP_ID, &ip_id, sizeof(ip_id));
-    //libosfp_fingerprint_setup_field(fp, LIBOSFP_FIELD_IP_TOS, &ip_tos, sizeof(ip_tos));
-    libosfp_fingerprint_setup_field(fp, LIBOSFP_FIELD_IP_TOTAL_LENGTH, &ip_total_length, sizeof(ip_total_length));
-    libosfp_fingerprint_setup_field(fp, LIBOSFP_FIELD_IP_TTL, &ip_ttl, sizeof(ip_ttl));
-
-    return 0;
-exit:
-    return -1;
-}
-
-int libosfp_fingerprinting(unsigned char *iph, unsigned char *tcph, libosfp_fingerprint_t *fp)
-{
-    int ret, ip_version;
-
-    if (iph == NULL || tcph == NULL || fp == NULL) {
-        goto exit;
-    }
-
-    memset(fp, 0, sizeof(libosfp_fingerprint_t));
-
-    ip_version = ((iph)[0] & 0xf0) >> 4;
-
-    switch (ip_version) {
-        case 4:
-            ret = libosfp_fingerprinting_ipv4((struct iphdr *)iph, fp);
-            break;
-        case 6:
-            ret = libosfp_fingerprinting_ipv6((struct ipv6hdr *)iph, fp);
-            break;
-        default:
-            ret = -1;
-            goto exit;
-    }
-
-    if (ret != 0) {
-        goto exit;
-    }
-
-    ret = libosfp_fingerprinting_tcp((struct tcphdr *)tcph, fp);
-    if (ret != 0) {
-        goto exit;
-    }
-
-    libosfp_fingerprint_setup_field(fp, LIBOSFP_FIELD_OS, "", strlen("") + 1);
-
-    return 0;
-exit:
-    return -1;
-}
--- a/src/libosfp_fingerprint.h
+++ b/src/libosfp_fingerprint.h
@@ -1,106 +0,0 @@
-#ifndef __LIBOSFP_FINGERPRINT_H__
-#define __LIBOSFP_FINGERPRINT_H__
-
-#include "libosfp.h"
-
-#define LIBOSFP_FINGERPRINT_VALUE_BUFFER_MAX 128
-
-#define LIBOSFP_TCP_OPTLENMAX                        64
-#define LIBOSFP_TCP_OPTMAX                           20
-
-//# TCP Options (opt_type) - http://www.iana.org/assignments/tcp-parameters
-#define LIBOSFP_TCP_OPT_EOL             0               //# end of option list
-#define LIBOSFP_TCP_OPT_NOP             1               //# no operation
-#define LIBOSFP_TCP_OPT_MSS             2               //# maximum segment size
-#define LIBOSFP_TCP_OPT_WSCALE          3               //# window scale factor, RFC 1072
-#define LIBOSFP_TCP_OPT_SACKOK          4               //# SACK permitted, RFC 2018
-#define LIBOSFP_TCP_OPT_SACK            5               //# SACK, RFC 2018
-#define LIBOSFP_TCP_OPT_ECHO            6               //# echo (obsolete), RFC 1072
-#define LIBOSFP_TCP_OPT_ECHOREPLY       7               //# echo reply (obsolete), RFC 1072
-#define LIBOSFP_TCP_OPT_TIMESTAMP       8               //# timestamps, RFC 1323
-#define LIBOSFP_TCP_OPT_POCONN          9               //# partial order conn, RFC 1693
-#define LIBOSFP_TCP_OPT_POSVC           10              //# partial order service, RFC 1693
-#define LIBOSFP_TCP_OPT_CC              11              //# connection count, RFC 1644
-#define LIBOSFP_TCP_OPT_CCNEW           12              //# CC.NEW, RFC 1644
-#define LIBOSFP_TCP_OPT_CCECHO          13              //# CC.ECHO, RFC 1644
-#define LIBOSFP_TCP_OPT_ALTSUM          14              //# alt checksum request, RFC 1146
-#define LIBOSFP_TCP_OPT_ALTSUMDATA      15              //# alt checksum data, RFC 1146
-#define LIBOSFP_TCP_OPT_SKEETER         16              //# Skeeter
-#define LIBOSFP_TCP_OPT_BUBBA           17              //# Bubba
-#define LIBOSFP_TCP_OPT_TRAILSUM        18              //# trailer checksum
-#define LIBOSFP_TCP_OPT_MD5             19              //# MD5 signature, RFC 2385
-#define LIBOSFP_TCP_OPT_SCPS            20              //# SCPS capabilities
-#define LIBOSFP_TCP_OPT_SNACK           21              //# selective negative acks
-#define LIBOSFP_TCP_OPT_REC             22              //# record boundaries
-#define LIBOSFP_TCP_OPT_CORRUPT         23              //# corruption experienced
-#define LIBOSFP_TCP_OPT_SNAP            24              //# SNAP
-#define LIBOSFP_TCP_OPT_TCPCOMP         26              //# TCP compression filter
-#define LIBOSFP_TCP_OPT_MAX             27              //# Quick-Start Response
-#define LIBOSFP_TCP_OPT_USRTO           28              //# User Timeout Option (also, other known unauthorized use) [***][1]     [RFC5482]
-#define LIBOSFP_TCP_OPT_AUTH            29              //# TCP Authentication Option (TCP-AO)    [RFC5925]
-#define LIBOSFP_TCP_OPT_MULTIPATH       30              //# Multipath TCP (MPTCP)
-#define LIBOSFP_TCP_OPT_FASTOPEN        34              //# TCP Fast Open Cookie  [RFC7413]
-#define LIBOSFP_TCP_OPY_ENCNEG          69              //# Encryption Negotiation (TCP-ENO)      [RFC8547]
-#define LIBOSFP_TCP_OPT_EXP1            253             //# RFC3692-style Experiment 1 (also improperly used for shipping products)
-#define LIBOSFP_TCP_OPT_EXP2            254             //# RFC3692-style Experiment 2 (also improperly used for shipping products)
-
-#define LIBOSFP_TCP_OPT_SACKOK_LEN                   2
-#define LIBOSFP_TCP_OPT_WS_LEN                       3
-#define LIBOSFP_TCP_OPT_TS_LEN                       10
-#define LIBOSFP_TCP_OPT_MSS_LEN                      4
-#define LIBOSFP_TCP_OPT_SACK_MIN_LEN                 10 /* hdr 2, 1 pair 8 = 10 */
-#define LIBOSFP_TCP_OPT_SACK_MAX_LEN                 34 /* hdr 2, 4 pair 32= 34 */
-#define LIBOSFP_TCP_OPT_TFO_MIN_LEN                  4  /* kind, len, 2 bytes cookie: 4 */
-#define LIBOSFP_TCP_OPT_TFO_MAX_LEN                  18 /* kind, len, 18 */
-
-
-typedef enum libosfp_field_id {
-    LIBOSFP_FIELD_IP_ID,
-    LIBOSFP_FIELD_IP_TOS,
-    LIBOSFP_FIELD_IP_TOTAL_LENGTH,
-    LIBOSFP_FIELD_IP_TTL,
-    LIBOSFP_FIELD_TCP_OFF,
-    LIBOSFP_FIELD_TCP_TIMESTAMP,
-    LIBOSFP_FIELD_TCP_TIMESTAMP_ECHO_REPLY,
-    LIBOSFP_FIELD_TCP_WINDOW_SCALING,
-    LIBOSFP_FIELD_TCP_WINDOW_SIZE,
-    LIBOSFP_FIELD_TCP_FLAGS,
-    LIBOSFP_FIELD_TCP_MSS,
-    LIBOSFP_FIELD_TCP_OPTIONS,
-    LIBOSFP_FIELD_TCP_OPTIONS_ORDERED,
-    LIBOSFP_FIELD_OS,
-    LIBOSFP_FIELD_MAX,
-} libosfp_field_id_t;
-
-typedef enum libosfp_field_type {
-    LIBOSFP_FIELD_TYPE_UNKNOWN,
-    LIBOSFP_FIELD_TYPE_UINT,
-    LIBOSFP_FIELD_TYPE_STRING,
-    LIBOSFP_FIELD_TYPE_MAX
-} libosfp_field_type_t;
-
-typedef struct libosfp_fingerprint_field {
-    char            *name;
-    unsigned int    enabled;
-    unsigned int    type;
-    unsigned int    importance;
-    void            *value;
-    unsigned int    value_len;
-} libosfp_fingerprint_field_t;
-
-typedef struct libosfp_fingerprint {
-    libosfp_fingerprint_field_t fields[LIBOSFP_FIELD_MAX];
-    char                        value_buffer[LIBOSFP_FINGERPRINT_VALUE_BUFFER_MAX];
-    unsigned                    value_buffer_used;
-} libosfp_fingerprint_t;
-
-
-char *libosfp_fingerprint_get_field_name(libosfp_field_id_t field_id);
-unsigned int libosfp_fingerprint_get_field_enabled(libosfp_field_id_t field_id);
-unsigned int libosfp_fingerprint_get_field_importance(libosfp_field_id_t field_id);
-unsigned int libosfp_fingerprint_get_field_type(libosfp_field_id_t field_id);
-
-int libosfp_fingerprint_to_json_buf(libosfp_fingerprint_t *fp, char *strbuf, unsigned int buf_len);
-int libosfp_fingerprinting(unsigned char *iphdr, unsigned char *tcphdr, libosfp_fingerprint_t *fp);
-
-#endif
--- a/src/libosfp_log.c
+++ b/src/libosfp_log.c
@@ -1,58 +0,0 @@
-#include <stdlib.h>
-#include <string.h>
-#include <stdarg.h>
-#include <time.h>
-
-#include "libosfp.h"
-#include "libosfp_log.h"
-
-/* The maximum length of the log message */
-#define LIBOSFP_MAX_LOG_MSG_LEN 2048
-
-unsigned int libosfp_log_level = LIBOSFP_LOG_LEVEL_INFO;
-
-void libosfp_log_message(unsigned int x, const char *file, const int line, const char *func, const char *msg)
-{
-    char buffer[LIBOSFP_MAX_LOG_MSG_LEN] = "";
-    char log_time_buf[128];
-    time_t now;
-    struct tm tm_now;
-
-    time(&now);
-    localtime_r(&now, &tm_now);
-    strftime(log_time_buf, sizeof(log_time_buf), "%Y-%m-%d %T", &tm_now);
-
-    switch (x) {
-        case LIBOSFP_LOG_LEVEL_DEBUG:
-            snprintf(buffer, sizeof(buffer), "[%s][DEBUG][%s:%d %s] %s", log_time_buf, file, line, func, msg);
-            break;
-        case LIBOSFP_LOG_LEVEL_INFO:
-            snprintf(buffer, sizeof(buffer), "[%s][INFO][%s:%d %s] %s", log_time_buf, file, line, func, msg);
-            break;
-        case LIBOSFP_LOG_LEVEL_WARNING:
-            snprintf(buffer, sizeof(buffer), "[%s][WARN][%s:%d %s] %s", log_time_buf, file, line, func, msg);
-            break;
-        case LIBOSFP_LOG_LEVEL_ERROR:
-            snprintf(buffer, sizeof(buffer), "[%s][ERROR][%s:%d %s] %s", log_time_buf, file, line, func, msg);
-            break;
-    }
-
-}
-
-void libosfp_log(unsigned int x, const char *file, const char *func, const int line, const char *fmt, ...)
-{
-    if (libosfp_log_level >= x ) {
-        char msg[LIBOSFP_MAX_LOG_MSG_LEN];
-        va_list ap;
-        va_start(ap, fmt);
-        vsnprintf(msg, sizeof(msg), fmt, ap);
-        va_end(ap);
-        libosfp_log_message(x, file, line, func, msg);
-    }
-}
-
-void libosfp_log_level_set(libosfp_log_level_t level)
-{
-    libosfp_log_level = level;
-}
-
--- a/src/libosfp_log.h
+++ b/src/libosfp_log.h
@@ -1,20 +0,0 @@
-#ifndef __LIBOSFP_LOG_H__
-#define __LIBOSFP_LOG_H__
-
-typedef enum libosfp_log_level {
-    LIBOSFP_LOG_LEVEL_DEBUG,
-    LIBOSFP_LOG_LEVEL_INFO,
-    LIBOSFP_LOG_LEVEL_WARNING,
-    LIBOSFP_LOG_LEVEL_ERROR
-} libosfp_log_level_t;
-
-#define libosfp_log_debug(...) libosfp_log(LIBOSFP_LOG_LEVEL_DEBUG, __FILE__, __LINE__, __FUNCTION__, __VA_ARGS__)
-#define libosfp_log_info(...) libosfp_log(LIBOSFP_LOG_LEVEL_INFO, __FILE__, __LINE__, __FUNCTION__, __VA_ARGS__)
-#define libosfp_log_warning(...) libosfp_log(LIBOSFP_LOG_LEVEL_WARNING, __FILE__, __LINE__, __FUNCTION__, __VA_ARGS__)
-#define libosfp_log_error(...) libosfp_log(LIBOSFP_LOG_LEVEL_ERROR, __FILE__, __LINE__,  __FUNCTION__,__VA_ARGS__)
-
-
-void libosfp_log_level_set(libosfp_log_level_t level);
-void libosfp_log(unsigned int x, const char *file, const char *func, const int line, const char *fmt, ...);
-
-#endif
--- a/src/libosfp_score_db.c
+++ b/src/libosfp_score_db.c
@@ -1,539 +0,0 @@
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-#include <malloc.h>
-
-#include <linux/in.h>
-#include <linux/if_ether.h>
-#include <linux/ip.h>
-#include <linux/ipv6.h>
-#include <linux/tcp.h>
-
-#include <sys/fcntl.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-
-#include "uthash.h"
-#include "cJSON.h"
-
-#include "libosfp.h"
-#include "libosfp_fingerprint.h"
-#include "libosfp_score_db.h"
-#include "libosfp_log.h"
-
-#define LIBOSFP_SCORE_DB_FIELD_UINT_VALUE_MAX 65536
-
-typedef struct libosfp_score_db_array_data {
-    libosfp_score_t *array_head;
-    unsigned int    array_len;
-} libosfp_score_db_array_data_t;
-
-typedef struct libosfp_score_db_hash_element {
-    char *key;
-    unsigned int keylen;
-    libosfp_score_t *score;
-    UT_hash_handle hh;
-} libosfp_score_db_hash_element_t;
-
-typedef struct libosfp_score_db_hash_data {
-    libosfp_score_db_hash_element_t  *hash_head;
-} libosfp_score_db_hash_data_t;
-
-
-int libosfp_score_db_array_add(void *data, libosfp_score_t *score, void *value, unsigned int len)
-{
-    int ret = -1, i;
-    unsigned int index;
-    libosfp_score_db_array_data_t *array_data = (libosfp_score_db_array_data_t *)data;
-
-    if (array_data == NULL || score == NULL || value == NULL || len != sizeof(unsigned int)) {
-        goto exit;
-    }
-
-    if (array_data->array_head == NULL || array_data->array_len == 0) {
-        goto exit;
-    }
-
-    index = *(unsigned int *)value;
-
-    if (index >= array_data->array_len) {
-        goto exit;
-    }
-
-    for (i = 0; i < LIBOSFP_OS_CLASS_MAX; i++) {
-        array_data->array_head[index].os_class_score[i] += score->os_class_score[i];
-    }
-
-    return 0;
-exit:
-    return ret;
-}
-
-libosfp_score_t *libosfp_score_db_array_match(void *data, void *value, unsigned int len)
-{
-    unsigned int index;
-    libosfp_score_db_array_data_t *array_data = (libosfp_score_db_array_data_t *)data;
-
-    if (array_data == NULL || value == NULL || len != sizeof(unsigned int)) {
-        return NULL;
-    }
-
-    if (array_data->array_head == NULL || array_data->array_len == 0) {
-        return NULL;
-    }
-
-    index = *(unsigned int *)value;
-
-    if (index >= array_data->array_len) {
-        return NULL;
-    }
-
-    return &((array_data->array_head)[index]);
-}
-
-void *libosfp_score_db_array_create(void)
-{
-    libosfp_score_db_array_data_t *array_data = calloc(1, sizeof(libosfp_score_db_array_data_t));
-    if (array_data == NULL) {
-        return NULL;
-    }
-
-    array_data->array_head = calloc(LIBOSFP_SCORE_DB_FIELD_UINT_VALUE_MAX, sizeof(libosfp_score_t));
-    if (array_data->array_head == NULL) {
-        free(array_data);
-        return NULL;
-    }
-
-    array_data->array_len = LIBOSFP_SCORE_DB_FIELD_UINT_VALUE_MAX;
-
-    return (void *)array_data;
-}
-
-void libosfp_score_db_array_destroy(void *data) {
-    libosfp_score_db_array_data_t *array_data = (libosfp_score_db_array_data_t *)data;
-
-    if (array_data) {
-        if (array_data->array_head) {
-            free(array_data->array_head);
-        }
-        free(array_data);
-    }
-}
-
-int libosfp_score_db_hash_add(void *data, libosfp_score_t *score, void *value, unsigned int len)
-{
-    int ret = -1, i;
-    libosfp_score_db_hash_data_t *hash_data = (libosfp_score_db_hash_data_t *)data;
-    libosfp_score_db_hash_element_t *element = NULL;
-
-    if (hash_data == NULL || score == NULL || value == NULL || len == 0) {
-        goto exit;
-    }
-
-    HASH_FIND(hh, hash_data->hash_head, value, len, element);
-    if (element == NULL) {
-        element = (libosfp_score_db_hash_element_t *)calloc(1, sizeof(libosfp_score_db_hash_element_t));
-        if (element == NULL) {
-            goto exit;
-        }
-        element->key = strdup(value);
-        element->keylen = len;
-        element->score = (libosfp_score_t *)calloc(1, sizeof(libosfp_score_t));
-        if (element->score == NULL) {
-            free(element);
-            element = NULL;
-            goto exit;
-        }
-        HASH_ADD_KEYPTR(hh, hash_data->hash_head, element->key, element->keylen, element);
-    }
-
-    for (i = 0; i < LIBOSFP_OS_CLASS_MAX; i++) {
-        element->score->os_class_score[i] += score->os_class_score[i];
-    }
-
-    return 0;
-exit:
-    return ret;
-}
-
-libosfp_score_t *libosfp_score_db_hash_match(void *data, void *value, unsigned int len)
-{
-    libosfp_score_db_hash_data_t *hash_data = (libosfp_score_db_hash_data_t *)data;
-    libosfp_score_db_hash_element_t *element = NULL;
-
-    if (data == NULL || value == NULL || len == 0) {
-        return NULL;
-    }
-
-    if (hash_data->hash_head == NULL) {
-        return NULL;
-    }
-
-    HASH_FIND(hh, hash_data->hash_head, value, len, element);
-    if (element == NULL) {
-        return NULL;
-    }
-
-    return element->score;
-}
-
-void *libosfp_score_db_hash_create(void)
-{
-    return (void*)calloc(1, sizeof(libosfp_score_db_hash_data_t));
-}
-
-void libosfp_score_db_hash_destroy(void *data) {
-    libosfp_score_db_hash_data_t *hash_data = (libosfp_score_db_hash_data_t *)data;
-    libosfp_score_db_hash_element_t *element = NULL;
-    libosfp_score_db_hash_element_t *tmp = NULL;
-
-    if (hash_data) {
-        if (hash_data->hash_head) {
-            HASH_ITER(hh, hash_data->hash_head, element, tmp) {
-                HASH_DELETE(hh, hash_data->hash_head, element);
-                if (element) {
-                    if (element->key) {
-                        free(element->key);
-                    }
-                    if (element->score) {
-                        free(element->score);
-                    }
-                    free(element);
-                }
-            }
-        }
-        free(hash_data);
-    }
-}
-
-libosfp_score_t *libosfp_score_db_filed_match(libosfp_field_score_db_t *db, void *value, unsigned int len)
-{
-    if (db == NULL || value == NULL || len == 0) {
-        return NULL;
-    }
-
-    return  db->match(db->data, value, len);
-}
-
-char *libosfp_score_db_read_file(char *fp_file)
-{
-    int ret = -1;
-    char *file_buffer = NULL;
-    unsigned int file_len = 0;
-    FILE *fp = NULL;
-    struct stat st;
-
-    if (0 > stat(fp_file, &st)) {
-        printf("stat() on '%s' failed.\n", fp_file);
-        goto exit;
-    }
-
-    if (st.st_size == 0) { 
-        printf("Empty file: %s.\n", fp_file);
-        goto exit;
-    }
-
-    file_len = (unsigned int)st.st_size;
-    file_buffer = malloc(file_len);
-    if (file_buffer == NULL) {
-        printf("Not enough memory for file buffer. file name: %s\n",fp_file);
-        goto exit;
-    }
-
-    fp = fopen(fp_file, "r");
-    if (fp == NULL) {
-        printf("Cannot open '%s' for reading.\n", fp_file);
-        goto exit;
-    }
-
-    ret = fread(file_buffer, 1, file_len, fp);
-    if (ret < 0) {
-        free(file_buffer);
-        fclose(fp);
-        goto exit;
-    }
-
-    fclose(fp);
-
-    return file_buffer;
-exit:
-    return NULL;
-}
-
-int libosfp_score_db_load_field(libosfp_field_score_db_t *db, cJSON *field, libosfp_os_class_id_t os_class)
-{
-    int ret = -1;
-    libosfp_score_t score = {0};
-
-    void *value_ptr;
-    unsigned int value_len;
-
-    switch (field->type) {
-        case cJSON_Number:
-            value_ptr = (void *)&field->valueint;
-            value_len = sizeof(field->valueint);
-            break;
-        case cJSON_String:
-            value_ptr = (void *)field->valuestring;
-            value_len = strlen(field->valuestring) + 1;
-            break;
-        case cJSON_NULL:
-            ret = 0;
-            goto exit;
-        default:
-            goto exit;
-    }
-
-    score.os_class_score[os_class] = 1;
-
-    ret = db->add(db->data, &score, value_ptr, value_len);
-    if (ret != 0) {
-        goto exit;
-    }
-
-    db->entry_count++;
-
-    return 0;
-exit:
-    return ret;
-}
-
-int libosfp_score_db_load_entry(libosfp_score_db_t *score_db, cJSON *entry)
-{
-    int ret = -1, i;
-    cJSON *field = NULL;
-
-    if (score_db == NULL || entry == NULL) {
-        goto exit;
-    }
-
-    field = cJSON_GetObjectItem(entry, libosfp_fingerprint_get_field_name(LIBOSFP_FIELD_OS));
-    if (field == NULL || field->valuestring == NULL) {
-        goto exit;
-    }
-
-    libosfp_os_class_id_t os_class = libosfp_os_class_name_to_id(field->valuestring);
-    if (os_class >= LIBOSFP_OS_CLASS_MAX) {
-        goto exit;
-    }
-
-    for (i = 0; i < LIBOSFP_FIELD_OS; i++) {
-        libosfp_field_score_db_t *db = &score_db->field_score_dbs[i];
-        if (db == NULL) {
-            goto exit;
-        }
-
-        if (!db->enabled) {
-            continue;
-        }
-
-        field = cJSON_GetObjectItem(entry, libosfp_fingerprint_get_field_name(i));
-        if (field == NULL) {
-            printf("json entry missing field: %s\n%s\n",
-                        libosfp_fingerprint_get_field_name(i), cJSON_Print(entry));
-            continue;
-        }
-
-        ret = libosfp_score_db_load_field(db, field, os_class);
-        if (ret != 0) {
-            printf("json entry field load failed. field: %s\n%s\n",
-                        libosfp_fingerprint_get_field_name(i), cJSON_Print(entry));
-            continue;
-        }
-    }
-
-    score_db->entry_count++;
-    score_db->os_class_entry_count[os_class]++;
-
-    return 0;
-exit:
-    return ret;
-}
-
-int libosfp_score_db_load(libosfp_score_db_t *score_db, char *fp_file)
-{
-    int ret = LIBOSFP_EINVAL, i;
-    char *file_buffer;
-    libosfp_field_score_db_t *field_score_db;
-
-    cJSON *root = NULL;
-    cJSON *entry = NULL;
-
-    if (score_db == NULL || fp_file == NULL) {
-        goto exit;
-    }
-
-    file_buffer = libosfp_score_db_read_file(fp_file);
-    if (file_buffer == NULL) {
-        ret = LIBOSFP_ERR_READ_FILE;
-        goto exit;
-    }
-
-    root = cJSON_Parse(file_buffer);
-    if (root == NULL) {
-        ret = LIBOSFP_ERR_PARSE_FILE;
-        goto exit;
-    }
-
-    score_db->entry_count = cJSON_GetArraySize(root);
-
-    for (i = 0; i < LIBOSFP_FIELD_MAX; i++) {
-        field_score_db = &score_db->field_score_dbs[i];
-        if (field_score_db->enabled) {
-            score_db->perfect_score += libosfp_fingerprint_get_field_importance(i);
-        }
-    }
-
-    for (i = 0; i < score_db->entry_count; i++) {
-        entry = cJSON_GetArrayItem(root, i);
-        if (entry) {
-            ret = libosfp_score_db_load_entry(score_db, entry);
-            if (ret != 0) {
-                printf("json entry load failed.\n%s\n", cJSON_Print(entry));
-                continue;
-            }
-        } 
-    }
-
-    cJSON_Delete(root);
-
-    return 0;
-exit:
-    return ret;
-}
-
-int libosfp_score_db_score(libosfp_context_t *libosfp_context, libosfp_fingerprint_t *fp, libosfp_result_t *result)
-{
-    int ret = -1, i, j;
-    void *field_value;
-    unsigned int os_class_score;
-    unsigned int perfect_score;
-    unsigned int entry_count;
-    unsigned int importance;
-    unsigned int field_len;
-    libosfp_score_t *score;
-    libosfp_score_db_t *score_db;
-    libosfp_field_score_db_t *field_score_db;
-
-    if (libosfp_context == NULL || fp == NULL || result == NULL) {
-        goto exit;
-    }
-
-    memset(result, 0, sizeof(libosfp_result_t));
-
-    score_db = (libosfp_score_db_t*)libosfp_context->score_db;
-
-    for (i = 0; i < LIBOSFP_FIELD_MAX; i++) {
-        if (!fp->fields[i].enabled) {
-            continue;
-        }
-
-        field_score_db = &score_db->field_score_dbs[i];
-        if (!field_score_db->enabled) {
-            continue;
-        }
-
-        field_value = fp->fields[i].value;
-        field_len = fp->fields[i].value_len;
-
-        score = libosfp_score_db_filed_match(field_score_db, field_value, field_len);
-        if (score == NULL) {
-            continue;
-        }
-
-        importance = libosfp_fingerprint_get_field_importance(i);
-
-        for (j = 0; j < LIBOSFP_OS_CLASS_MAX; j++) {
-            result->score.os_class_score[j] += score->os_class_score[j] * importance;
-        }
-
-        if (i == LIBOSFP_FIELD_TCP_OPTIONS) {
-            i++;
-        }
-    }
-
-
-    perfect_score = score_db->perfect_score;
-    result->perfect_score = perfect_score;
-
-    for (j = 0; j < LIBOSFP_OS_CLASS_MAX; j++) {
-        entry_count = score_db->os_class_entry_count[j];
-        os_class_score = result->score.os_class_score[j];
-
-        if (entry_count == 0 || perfect_score == 0) {
-            continue;
-        }
-
-        os_class_score = 100 * os_class_score / entry_count;
-        os_class_score = (unsigned int)((float)os_class_score / (float)perfect_score);
-
-        if (result->likely_score < os_class_score) {
-            result->likely_score = os_class_score;
-            result->likely_os_class = j;
-        }
-        result->score.os_class_score[j] = os_class_score;
-    }
-
-    return 0;
-exit:
-    return ret;
-}
-
-libosfp_score_db_t *libosfp_score_db_create(void)
-{
-    int ret = -1, i;
-    libosfp_score_db_t *score_db;
-    libosfp_field_score_db_t *db;
-
-    score_db = calloc(1, sizeof(libosfp_score_db_t));
-
-    for (i = 0; i < LIBOSFP_FIELD_MAX; i++) {
-        db = &score_db->field_score_dbs[i];
-        db->enabled = libosfp_fingerprint_get_field_enabled(i);
-        db->type = libosfp_fingerprint_get_field_type(i);
-
-        switch (score_db->field_score_dbs[i].type) {
-            case LIBOSFP_FIELD_TYPE_UINT:
-                score_db->field_score_dbs[i].create = libosfp_score_db_array_create;
-                score_db->field_score_dbs[i].destroy = libosfp_score_db_array_destroy;
-                score_db->field_score_dbs[i].add = libosfp_score_db_array_add;
-                score_db->field_score_dbs[i].match = libosfp_score_db_array_match;
-                break;
-            case LIBOSFP_FIELD_TYPE_STRING:
-                score_db->field_score_dbs[i].create = libosfp_score_db_hash_create;
-                score_db->field_score_dbs[i].destroy = libosfp_score_db_hash_destroy;
-                score_db->field_score_dbs[i].add = libosfp_score_db_hash_add;
-                score_db->field_score_dbs[i].match = libosfp_score_db_hash_match;
-                break;
-            default:
-                goto exit;
-        }
-
-        db->data = score_db->field_score_dbs[i].create();
-        if (db->data == NULL) {
-            continue;
-        }
-    }
-
-    return score_db;
-exit:
-    if (score_db) {
-        libosfp_score_db_destroy(score_db);
-    }
-    return NULL;
-}
-
-void libosfp_score_db_destroy(libosfp_score_db_t *score_db)
-{
-    int i;
-    libosfp_field_score_db_t *db;
-
-    if (score_db) {
-        for (i = 0; i < LIBOSFP_FIELD_MAX; i++) {
-            db = &score_db->field_score_dbs[i];
-            db->destroy(db->data);
-            db->data = NULL;
-        }
-        free(score_db);
-    }
-}
--- a/src/libosfp_score_db.h
+++ b/src/libosfp_score_db.h
@@ -1,34 +0,0 @@
-#ifndef __LIBOSFP_SCORE_DB_H__
-#define __LIBOSFP_SCORE_DB_H__
-
-#include "libosfp.h"
-#include "libosfp_fingerprint.h"
-
-typedef struct libosfp_field_score_db {
-    unsigned int    enabled;
-    unsigned int    type;
-    unsigned int    entry_count;
-
-    void            *data;
-
-    void *(*create)(void);
-    void (*destroy)(void *);
-    int (*add)(void *data, libosfp_score_t *, void *, unsigned int);
-    libosfp_score_t *(*match)(void *, void *, unsigned int);
-} libosfp_field_score_db_t;
-
-typedef struct libosfp_score_db {
-    unsigned int entry_count;
-    unsigned int perfect_score;
-    unsigned int os_class_entry_count[LIBOSFP_OS_CLASS_MAX];
-    libosfp_field_score_db_t field_score_dbs[LIBOSFP_FIELD_MAX];
-} libosfp_score_db_t;
-
-int libosfp_score_db_load(libosfp_score_db_t *score_db, char *fp_file);
-int libosfp_score_db_score(libosfp_context_t *libosfp_context, libosfp_fingerprint_t *fp, libosfp_result_t *result);
-
-libosfp_score_db_t *libosfp_score_db_create(void);
-void libosfp_score_db_destroy(libosfp_score_db_t *score_db);
-
-
-#endif
--- a/src/osfp.c
+++ b/src/osfp.c
@@ -0,0 +1,298 @@
+#include "osfp_common.h"
+
+#include "osfp.h"
+#include "osfp_fingerprint.h"
+#include "osfp_score_db.h"
+#include "osfp_log.h"
+
+#define OSFP_DEFAULT_RESULT_BUFLEN_MAX  512
+#define OSFP_LOWEST_SCORE_LIMIT 20
+
+static struct osfp_result *osfp_result_build(struct osfp_os_class_score *os_class_score)
+{
+    int i;
+    unsigned int tmp_score;
+    unsigned int sum_score;
+    unsigned int likely_score;
+    enum osfp_os_class_id likely_os_class;
+    struct osfp_result *result;
+
+    result = calloc(1, sizeof(struct osfp_result));
+    if (result == NULL) {
+        goto exit;
+    }
+
+    likely_score = 0;
+    likely_os_class = OSFP_OS_CLASS_OTHERS;
+    sum_score = 0;
+
+    for (i = 0; i < OSFP_OS_CLASS_MAX; i++) {
+        tmp_score = os_class_score->scores[i];
+
+        if (likely_score < tmp_score) {
+            likely_score = tmp_score;
+            likely_os_class = i;
+        }
+        result->details[i].score = tmp_score;
+        sum_score += tmp_score;
+    }
+
+    if (sum_score) {
+        for (i = 0; i < OSFP_OS_CLASS_MAX; i++) {
+            result->details[i].possibility = OSFP_PERCENTILE * result->details[i].score / sum_score;
+        }
+    }
+
+    if (likely_score < OSFP_LOWEST_SCORE_LIMIT) {
+        likely_os_class = OSFP_OS_CLASS_OTHERS;
+    } else {
+        for (i = 0; i < OSFP_OS_CLASS_MAX; i++) {
+            if (likely_os_class == i) {
+                continue;
+            }
+            if (likely_score == os_class_score->scores[i]) {
+                if (likely_os_class == OSFP_OS_CLASS_LINUX && i == OSFP_OS_CLASS_ANDROID) {
+                    continue;
+                } else if (likely_os_class == OSFP_OS_CLASS_MAC_OS && i == OSFP_OS_CLASS_IOS) {
+                    continue;
+                } else {
+                    likely_os_class = OSFP_OS_CLASS_UNKNOWN;
+                    break;
+                }
+            }
+        }
+    }
+
+    result->likely_os_class = likely_os_class;
+
+    return result;
+exit:
+    return NULL;
+}
+
+const char *osfp_result_os_name_get(struct osfp_result *result)
+{
+    enum osfp_os_class_id os_class;
+
+    if (result == NULL) {
+        return NULL;
+    }
+
+    os_class = result->likely_os_class;
+    if (os_class < 0 || os_class >= OSFP_OS_CLASS_MAX) {
+        return NULL;
+    }
+
+    return osfp_os_class_id_to_name(os_class);
+}
+
+char *osfp_result_score_detail_export(struct osfp_result *result)
+{
+    int i;
+    char *result_str = NULL;
+    cJSON *root = NULL;
+    cJSON *array;
+    cJSON *os_score;
+
+    if (result == NULL) {
+        goto exit;
+    }
+
+    if (result->json_str != NULL) {
+        result_str = result->json_str;
+        goto exit;
+    }
+
+    root = cJSON_CreateObject();
+    if (root == NULL) {
+        goto exit;
+    }
+
+    os_score = cJSON_AddObjectToObject(root, "likely");
+    if (os_score) {
+        cJSON_AddStringToObject(os_score, "name", osfp_os_class_id_to_name(result->likely_os_class));
+        cJSON_AddNumberToObject(os_score, "score", result->details[result->likely_os_class].score);
+        //cJSON_AddNumberToObject(os_score, "possibility", result->details[result->likely_os_class].possibility);
+    }
+
+    array = cJSON_AddArrayToObject(root, "details");
+    if (array) {
+        for (i = OSFP_OS_CLASS_WINDOWS; i < OSFP_OS_CLASS_OTHERS; i++) {
+            os_score = cJSON_CreateObject();
+            if (os_score) {
+                cJSON_AddStringToObject(os_score, "name", osfp_os_class_id_to_name(i));
+                cJSON_AddNumberToObject(os_score, "score", result->details[i].score);
+                //cJSON_AddNumberToObject(os_score, "possibility", result->details[i].possibility);
+                cJSON_AddItemToArray(array, os_score);
+            }
+        }
+    }
+
+    result_str = cJSON_Print(root);
+    if (result_str == NULL) {
+        goto exit;
+    }
+
+    result->json_str = result_str;
+
+exit:
+    if (root) {
+        cJSON_Delete(root);
+    }
+    return result_str;
+}
+
+void osfp_result_free(struct osfp_result *result)
+{
+    if (result) {
+        if (result->json_str) {
+            free(result->json_str);
+        }
+        free(result);
+    }
+}
+
+struct osfp_result *osfp_ipv4_identify(struct osfp_db *db, struct iphdr* l3_hdr, struct tcphdr *l4_hdr, size_t l4_hdr_len)
+{
+    int ret = OSFP_EINVAL;
+    struct osfp_fingerprint fp;
+    struct osfp_os_class_score os_class_score;
+    struct osfp_result *result;
+
+    if (db == NULL || l3_hdr == NULL || l4_hdr == NULL || l4_hdr == 0) {
+        goto exit;
+    }
+
+    ret = osfp_fingerprinting((unsigned char *)l3_hdr, (unsigned char *)l4_hdr, (unsigned int)l4_hdr_len, &fp, 4);
+    if (ret != 0) {
+        goto exit;
+    }
+
+    ret = osfp_score_db_score(db->score_db, 0, &fp, &os_class_score);
+    if (ret != 0) {
+        goto exit;
+    }
+
+    result = osfp_result_build(&os_class_score);
+    if (result == NULL) {
+        goto exit;
+    }
+
+    return result;
+exit:
+    return NULL;
+}
+
+struct osfp_result *osfp_ipv6_identify(struct osfp_db *db, struct ipv6hdr* l3_hdr, struct tcphdr *l4_hdr, size_t l4_hdr_len)
+{
+    int ret = OSFP_EINVAL;
+    struct osfp_fingerprint fp;
+    struct osfp_os_class_score os_class_score;
+    struct osfp_result *result;
+
+    if (db == NULL || l3_hdr == NULL || l4_hdr == NULL) {
+        goto exit;
+    }
+
+    ret = osfp_fingerprinting((unsigned char *)l3_hdr, (unsigned char *)l4_hdr, (unsigned int)l4_hdr_len, &fp, 6);
+    if (ret != 0) {
+        goto exit;
+    }
+
+    ret = osfp_score_db_score(db->score_db, 0, &fp, &os_class_score);
+    if (ret != 0) {
+        goto exit;
+    }
+
+    result = osfp_result_build(&os_class_score);
+    if (result == NULL) {
+        goto exit;
+    }
+
+    return result;
+exit:
+    return NULL;
+}
+
+struct osfp_result *osfp_json_identify(struct osfp_db *db, const char *json_str)
+{
+    int ret = OSFP_EINVAL;
+    struct osfp_fingerprint fp;
+    struct osfp_os_class_score os_class_score;
+    struct osfp_result *result;
+
+    if (db == NULL) {
+        goto exit;
+    }
+
+    ret = osfp_fingerprint_from_json(&fp, json_str);
+    if (ret != 0) {
+        goto exit;
+    }
+
+    ret = osfp_score_db_score(db->score_db, 0, &fp, &os_class_score);
+    if (ret != 0) {
+        goto exit;
+    }
+
+    result = osfp_result_build(&os_class_score);
+    if (result == NULL) {
+        goto exit;
+    }
+
+    return result;
+exit:
+    return NULL;
+}
+
+struct osfp_db *osfp_db_new(const char *db_json_file)
+{
+    int ret;
+    struct osfp_db *db;
+
+    db = calloc(1, sizeof(struct osfp_db));
+    if (db == NULL) {
+        goto exit;
+    }
+
+    if (db_json_file != NULL) {
+        if (0 != access(db_json_file, R_OK)) {
+            goto exit;
+        }
+
+        db->db_json_path = strdup((const char*)db_json_file);
+        if (db->db_json_path == NULL) {
+            goto exit;
+        }
+    }
+
+    db->score_db = (void *)osfp_score_db_create();
+    if (db->score_db == NULL) {
+        goto exit;
+    }
+
+    ret = osfp_score_db_load((struct osfp_score_db *)db->score_db, db->db_json_path);
+    if (ret != 0) {
+        goto exit;
+    }
+
+    return db;
+exit:
+    if (db) {
+        osfp_db_free(db);
+    }
+    return NULL;
+}
+
+void osfp_db_free(struct osfp_db *db)
+{
+    if (db) {
+        if (db->db_json_path) {
+            free(db->db_json_path);
+        }
+        if (db->score_db) {
+            osfp_score_db_destroy(db->score_db);
+        }
+        free(db);
+    }
+}
--- a/src/osfp.h
+++ b/src/osfp.h
@@ -0,0 +1,130 @@
+#ifndef __OSFP_H__
+#define __OSFP_H__
+
+#include <stddef.h>
+#include <linux/in.h>
+#include <linux/if_ether.h>
+#include <linux/ip.h>
+#include <linux/ipv6.h>
+#include <linux/tcp.h>
+
+/**
+ * @brief 定义操作系统类别的名称常量。
+ */
+#define OSFP_OS_CLASS_NAME_UNKNOWN   "Unknown"
+#define OSFP_OS_CLASS_NAME_WINDOWS   "Windows"
+#define OSFP_OS_CLASS_NAME_LINUX     "Linux"
+#define OSFP_OS_CLASS_NAME_MAC_OS    "Mac OS"
+#define OSFP_OS_CLASS_NAME_IOS       "iOS"
+#define OSFP_OS_CLASS_NAME_ANDROID   "Android"
+#define OSFP_OS_CLASS_NAME_OTHERS    "Others"
+
+/**
+ * @brief 枚举表示不同的操作系统类别。
+ */
+enum osfp_os_class_id {
+    OSFP_OS_CLASS_UNKNOWN,      // 未知
+    OSFP_OS_CLASS_WINDOWS,      // Windows
+    OSFP_OS_CLASS_LINUX,        // Linux
+    OSFP_OS_CLASS_MAC_OS,       // Mac OS
+    OSFP_OS_CLASS_IOS,          // iOS
+    OSFP_OS_CLASS_ANDROID,      // Android
+    OSFP_OS_CLASS_OTHERS,       // 其他
+    OSFP_OS_CLASS_MAX,
+};
+
+/**
+ * @brief 结构体用于 osfp_result 中的详细结果。
+ */
+struct osfp_result_detail {
+    unsigned int score;         // 得分
+    unsigned int possibility;   // 可能性
+};
+
+/**
+ * @brief 结构体用于表示操作系统识别结果。
+ */
+struct osfp_result {
+    char *json_str;                              // JSON 字符串
+    enum osfp_os_class_id likely_os_class;        // 最可能的操作系统类别
+    struct osfp_result_detail details[OSFP_OS_CLASS_MAX];   // 详细结果数组
+};
+
+/**
+ * @brief 结构体用于表示操作系统指纹库。
+ */
+struct osfp_db {
+    char *db_json_path;   // 操作系统指纹库 JSON 文件路径
+    void *score_db;       // 分数数据库指针
+};
+
+/**
+ * @brief 创建一个新的操作系统指纹库。
+ * 
+ * @param db_json_path 操作系统指纹库 JSON 文件的路径。
+ * @return 指向新创建的操作系统指纹库的指针。
+ */
+struct osfp_db *osfp_db_new(const char *db_json_path);
+
+/**
+ * @brief 释放操作系统指纹库占用的内存。
+ * 
+ * @param db 指向要释放的操作系统指纹库的指针。
+ */
+void osfp_db_free(struct osfp_db *db);
+
+/**
+ * @brief 通过 IPv4 头部和 TCP 头部识别操作系统。
+ * 
+ * @param db 操作系统指纹库。
+ * @param l3_hdr 指向 IPv4 头部的指针。
+ * @param l4_hdr 指向 TCP 头部的指针。
+ * @param l4_hdr_len TCP 头部的长度（注意：包含TCP选项部分）。
+ * @return 指向操作系统识别结果的指针。
+ */
+struct osfp_result *osfp_ipv4_identify(struct osfp_db *db, struct iphdr* l3_hdr, struct tcphdr *l4_hdr, size_t l4_hdr_len);
+
+/**
+ * @brief 通过 IPv6 头部和 TCP 头部识别操作系统。
+ * 
+ * @param db 操作系统指纹库。
+ * @param l3_hdr 指向 IPv6 头部的指针。
+ * @param l4_hdr 指向 TCP 头部的指针。
+ * @param l4_hdr_len TCP 头部的长度（注意：包含TCP选项部分）。
+ * @return 指向操作系统识别结果的指针（注意：内存需要使用者释放）。
+ */
+struct osfp_result *osfp_ipv6_identify(struct osfp_db *db, struct ipv6hdr* l3_hdr, struct tcphdr *l4_hdr, size_t l4_hdr_len);
+
+/**
+ * @brief 通过 json 格式的指纹识别操作系统。
+ * 
+ * @param db 操作系统指纹库。
+ * @param json_str 指纹字符串。
+ * @return 指向操作系统识别结果的指针（注意：内存需要使用者释放）。
+ */
+struct osfp_result *osfp_json_identify(struct osfp_db *db, const char *json_str);
+
+/**
+ * @brief 获取操作系统识别结果的操作系统名称。
+ * 
+ * @param result 操作系统识别结果。
+ * @return 指向操作系统名称的常量字符指针（注意：这块内存将由osfp_result_free释放）。
+ */
+const char *osfp_result_os_name_get(struct osfp_result *result);
+
+/**
+ * @brief 导出操作系统识别结果的得分详情。
+ * 
+ * @param result 操作系统识别结果。
+ * @return 指向得分详情字符串的指针（注意：内存需要使用者释放）。
+ */
+char *osfp_result_score_detail_export(struct osfp_result *result);
+
+/**
+ * @brief 释放操作系统识别结果占用的内存。
+ * 
+ * @param result 操作系统识别结果。
+ */
+void osfp_result_free(struct osfp_result *result);
+
+#endif
--- a/src/osfp_common.c
+++ b/src/osfp_common.c
@@ -0,0 +1,40 @@
+#include "osfp_common.h"
+
+#include "osfp.h"
+
+const char *os_class_name[OSFP_OS_CLASS_MAX] = {
+    OSFP_OS_CLASS_NAME_UNKNOWN,
+    OSFP_OS_CLASS_NAME_WINDOWS,
+    OSFP_OS_CLASS_NAME_LINUX,
+    OSFP_OS_CLASS_NAME_MAC_OS,
+    OSFP_OS_CLASS_NAME_IOS,
+    OSFP_OS_CLASS_NAME_ANDROID,
+    OSFP_OS_CLASS_NAME_OTHERS
+};
+
+enum osfp_os_class_id osfp_os_class_name_to_id(char *name)
+{
+    enum osfp_os_class_id os_class;
+
+    if (0 == strncmp(name, OSFP_OS_CLASS_NAME_WINDOWS, strlen(OSFP_OS_CLASS_NAME_WINDOWS))) {
+        os_class = OSFP_OS_CLASS_WINDOWS;
+    } else if (0 == strncmp(name, OSFP_OS_CLASS_NAME_LINUX, strlen(OSFP_OS_CLASS_NAME_LINUX))) {
+        os_class = OSFP_OS_CLASS_LINUX;
+    } else if (0 == strncmp(name, OSFP_OS_CLASS_NAME_MAC_OS, strlen(OSFP_OS_CLASS_NAME_MAC_OS))) {
+        os_class = OSFP_OS_CLASS_MAC_OS;
+    } else if (0 == strncmp(name, OSFP_OS_CLASS_NAME_IOS, strlen(OSFP_OS_CLASS_NAME_IOS))) {
+        os_class = OSFP_OS_CLASS_IOS;
+    } else if (0 == strncmp(name, OSFP_OS_CLASS_NAME_ANDROID, strlen(OSFP_OS_CLASS_NAME_ANDROID))) {
+        os_class = OSFP_OS_CLASS_ANDROID;
+    } else {
+        os_class = OSFP_OS_CLASS_MAX;
+    }
+
+    return os_class;
+}
+
+const char *osfp_os_class_id_to_name(enum osfp_os_class_id os_class)
+{
+    return os_class_name[os_class];
+}
+
--- a/src/osfp_common.h
+++ b/src/osfp_common.h
@@ -0,0 +1,133 @@
+#ifndef __OSFP_COMMON_H__
+#define __OSFP_COMMON_H__
+
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <malloc.h>
+#include <stdarg.h>
+#include <time.h>
+
+#include <linux/in.h>
+#include <linux/if_ether.h>
+#include <linux/ip.h>
+#include <linux/ipv6.h>
+#include <linux/tcp.h>
+#include <sys/fcntl.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+
+#include "utarray.h"
+#include "uthash.h"
+#include "utlist.h"
+#include "utringbuffer.h"
+#include "utstack.h"
+#include "utstring.h"
+
+#include "cJSON.h"
+
+#include "osfp.h"
+
+#define OSFP_TCP_OPTLENMAX                        64
+#define OSFP_TCP_OPTMAX                           20
+
+#define OSFP_ETHERNET_HEADER_LEN     14
+#define OSFP_VLAN_HEADER_LEN         4
+#define OSFP_IPV4_HEADER_LEN         20
+#define OSFP_IPV6_HEADER_LEN         40
+#define OSFP_TCP_HEADER_LEN          20
+#define OSFP_TCP_DATA_OFF_MAX        60
+
+
+//# TCP Options (opt_type) - http://www.iana.org/assignments/tcp-parameters
+#define OSFP_TCP_OPT_EOL             0               //# end of option list
+#define OSFP_TCP_OPT_NOP             1               //# no operation
+#define OSFP_TCP_OPT_MSS             2               //# maximum segment size
+#define OSFP_TCP_OPT_WSCALE          3               //# window scale factor, RFC 1072
+#define OSFP_TCP_OPT_SACKOK          4               //# SACK permitted, RFC 2018
+#define OSFP_TCP_OPT_SACK            5               //# SACK, RFC 2018
+#define OSFP_TCP_OPT_ECHO            6               //# echo (obsolete), RFC 1072
+#define OSFP_TCP_OPT_ECHOREPLY       7               //# echo reply (obsolete), RFC 1072
+#define OSFP_TCP_OPT_TIMESTAMP       8               //# timestamps, RFC 1323
+#define OSFP_TCP_OPT_POCONN          9               //# partial order conn, RFC 1693
+#define OSFP_TCP_OPT_POSVC           10              //# partial order service, RFC 1693
+#define OSFP_TCP_OPT_CC              11              //# connection count, RFC 1644
+#define OSFP_TCP_OPT_CCNEW           12              //# CC.NEW, RFC 1644
+#define OSFP_TCP_OPT_CCECHO          13              //# CC.ECHO, RFC 1644
+#define OSFP_TCP_OPT_ALTSUM          14              //# alt checksum request, RFC 1146
+#define OSFP_TCP_OPT_ALTSUMDATA      15              //# alt checksum data, RFC 1146
+#define OSFP_TCP_OPT_SKEETER         16              //# Skeeter
+#define OSFP_TCP_OPT_BUBBA           17              //# Bubba
+#define OSFP_TCP_OPT_TRAILSUM        18              //# trailer checksum
+#define OSFP_TCP_OPT_MD5             19              //# MD5 signature, RFC 2385
+#define OSFP_TCP_OPT_SCPS            20              //# SCPS capabilities
+#define OSFP_TCP_OPT_SNACK           21              //# selective negative acks
+#define OSFP_TCP_OPT_REC             22              //# record boundaries
+#define OSFP_TCP_OPT_CORRUPT         23              //# corruption experienced
+#define OSFP_TCP_OPT_SNAP            24              //# SNAP
+#define OSFP_TCP_OPT_TCPCOMP         26              //# TCP compression filter
+#define OSFP_TCP_OPT_MAX             27              //# Quick-Start Response
+#define OSFP_TCP_OPT_USRTO           28              //# User Timeout Option (also, other known unauthorized use) [***][1]     [RFC5482]
+#define OSFP_TCP_OPT_AUTH            29              //# TCP Authentication Option (TCP-AO)    [RFC5925]
+#define OSFP_TCP_OPT_MULTIPATH       30              //# Multipath TCP (MPTCP)
+#define OSFP_TCP_OPT_FASTOPEN        34              //# TCP Fast Open Cookie  [RFC7413]
+#define OSFP_TCP_OPY_ENCNEG          69              //# Encryption Negotiation (TCP-ENO)      [RFC8547]
+#define OSFP_TCP_OPT_EXP1            253             //# RFC3692-style Experiment 1 (also improperly used for shipping products)
+#define OSFP_TCP_OPT_EXP2            254             //# RFC3692-style Experiment 2 (also improperly used for shipping products)
+
+#define OSFP_TCP_OPT_SACKOK_LEN                   2
+#define OSFP_TCP_OPT_WS_LEN                       3
+#define OSFP_TCP_OPT_TS_LEN                       10
+#define OSFP_TCP_OPT_MSS_LEN                      4
+#define OSFP_TCP_OPT_SACK_MIN_LEN                 10 /* hdr 2, 1 pair 8 = 10 */
+#define OSFP_TCP_OPT_SACK_MAX_LEN                 34 /* hdr 2, 4 pair 32= 34 */
+#define OSFP_TCP_OPT_TFO_MIN_LEN                  4  /* kind, len, 2 bytes cookie: 4 */
+#define OSFP_TCP_OPT_TFO_MAX_LEN                  18 /* kind, len, 18 */
+
+static inline unsigned long long osfp_rdtsc(void)
+{
+	union {
+		unsigned long long tsc_64;
+		struct {
+			unsigned int lo_32;
+			unsigned int hi_32;
+		};
+	} tsc;
+
+	asm volatile("rdtsc" :
+		     "=a" (tsc.lo_32),
+		     "=d" (tsc.hi_32));
+	return tsc.tsc_64;
+}
+
+#define osfp_profile_cycle(x) volatile unsigned long long x = 0
+#define osfp_profile_get_cycle(x) do { \
+        x = osfp_rdtsc(); \
+    } while(0)
+
+#define OSFP_BIT_U32(n) (1UL << (n))
+
+enum osfp_error_code {
+    OSFP_NOERR,
+    OSFP_EINVAL,
+    OSFP_ENOMEM,
+    OSFP_ERR_SCORE_DB_READ_FILE,
+    OSFP_ERR_SCORE_DB_PARSE_FILE,
+    OSFP_ERR_SCORE_DB_UNSUPPORTED,
+
+    OSFP_ERR_FINGERPRINTING_UNSUPPORTED,
+
+};
+
+#define OSFP_OS_CLASS_FLAG_WINDOWS   OSFP_BIT_U32(OSFP_OS_CLASS_WINDOWS)
+#define OSFP_OS_CLASS_FLAG_LINUX     OSFP_BIT_U32(OSFP_OS_CLASS_LINUX)
+#define OSFP_OS_CLASS_FLAG_MAC_OS    OSFP_BIT_U32(OSFP_OS_CLASS_MAC_OS)
+#define OSFP_OS_CLASS_FLAG_IOS       OSFP_BIT_U32(OSFP_OS_CLASS_IOS)
+#define OSFP_OS_CLASS_FLAG_ANDROID   OSFP_BIT_U32(OSFP_OS_CLASS_ANDROID)
+
+#define OSFP_PERCENTILE 100
+
+const char *osfp_os_class_id_to_name(enum osfp_os_class_id os_class);
+enum osfp_os_class_id osfp_os_class_name_to_id(char *name);
+
+#endif
--- a/src/osfp_fingerprint.c
+++ b/src/osfp_fingerprint.c
@@ -0,0 +1,590 @@
+#include "osfp_common.h"
+
+#include "osfp.h"
+#include "osfp_fingerprint.h"
+#include "osfp_log.h"
+
+#define OSFP_FINGERPRINT_FIELD_NAME_IP_ID                "ip_id"
+#define OSFP_FINGERPRINT_FIELD_NAME_IP_TOS               "ip_tos"
+#define OSFP_FINGERPRINT_FIELD_NAME_IP_TOTAL_LENGHT      "ip_total_length"
+#define OSFP_FINGERPRINT_FIELD_NAME_IP_TTL               "ip_ttl"
+#define OSFP_FINGERPRINT_FIELD_NAME_TCP_OFF              "tcp_off"
+#define OSFP_FINGERPRINT_FIELD_NAME_TCP_TIMESTAMP        "tcp_timestamp"
+#define OSFP_FINGERPRINT_FIELD_NAME_TCP_TIMESTAMP_ECHO_REPLY "tcp_timestamp_echo_reply"
+#define OSFP_FINGERPRINT_FIELD_NAME_TCP_WINDOW_WCALING   "tcp_window_scaling"
+#define OSFP_FINGERPRINT_FIELD_NAME_TCP_WINDOW_SIZE      "tcp_window_size"
+#define OSFP_FINGERPRINT_FIELD_NAME_TCP_FLAGS            "tcp_flags"
+#define OSFP_FINGERPRINT_FIELD_NAME_TCP_MSS              "tcp_mss"
+#define OSFP_FINGERPRINT_FIELD_NAME_TCP_OPTIONS          "tcp_options"
+#define OSFP_FINGERPRINT_FIELD_NAME_TCP_OPTIONS_ORDERED  "tcp_options_ordered"
+#define OSFP_FINGERPRINT_FIELD_NAME_OS                   "os"
+
+#define OSFP_FINGERPRINT_DEFAULT_OS_CLASS_NAME           "OSFP_UNKNOWN"
+
+struct osfp_tcp_opt {
+    unsigned char type;
+    unsigned char len;
+    const unsigned char *data;
+} osfp_tcp_opt;
+
+struct osfp_fingerprint_field fp_fields[OSFP_FIELD_MAX] = {
+    {OSFP_FINGERPRINT_FIELD_NAME_IP_ID,                   1, OSFP_FIELD_TYPE_UINT,    150,    NULL,    0},
+    {OSFP_FINGERPRINT_FIELD_NAME_IP_TOS,                  1, OSFP_FIELD_TYPE_UINT,    25,     NULL,    0},
+    {OSFP_FINGERPRINT_FIELD_NAME_IP_TOTAL_LENGHT,         1, OSFP_FIELD_TYPE_UINT,    250,    NULL,    0},
+    {OSFP_FINGERPRINT_FIELD_NAME_IP_TTL,                  1, OSFP_FIELD_TYPE_UINT,    200,    NULL,    0},
+    {OSFP_FINGERPRINT_FIELD_NAME_TCP_OFF,                 1, OSFP_FIELD_TYPE_UINT,    250,    NULL,    0},
+    {OSFP_FINGERPRINT_FIELD_NAME_TCP_TIMESTAMP,           0, OSFP_FIELD_TYPE_UINT,    0,      NULL,    0},
+    {OSFP_FINGERPRINT_FIELD_NAME_TCP_TIMESTAMP_ECHO_REPLY,1, OSFP_FIELD_TYPE_UINT,    200,    NULL,    0},
+    {OSFP_FINGERPRINT_FIELD_NAME_TCP_WINDOW_WCALING,      1, OSFP_FIELD_TYPE_UINT,    200,    NULL,    0},
+    {OSFP_FINGERPRINT_FIELD_NAME_TCP_WINDOW_SIZE,         1, OSFP_FIELD_TYPE_UINT,    200,    NULL,    0},
+    {OSFP_FINGERPRINT_FIELD_NAME_TCP_FLAGS,               1, OSFP_FIELD_TYPE_UINT,    25,     NULL,    0},
+    {OSFP_FINGERPRINT_FIELD_NAME_TCP_MSS,                 1, OSFP_FIELD_TYPE_UINT,    150,    NULL,    0},
+    {OSFP_FINGERPRINT_FIELD_NAME_TCP_OPTIONS,             1, OSFP_FIELD_TYPE_STRING,  400,    NULL,    0},
+    {OSFP_FINGERPRINT_FIELD_NAME_TCP_OPTIONS_ORDERED,     0, OSFP_FIELD_TYPE_STRING,  250,    NULL,    0},
+    {OSFP_FINGERPRINT_FIELD_NAME_OS,                      0, OSFP_FIELD_TYPE_STRING,  0,      NULL,    0},
+};
+
+static char option_to_ascii(unsigned char type)
+{
+    switch (type) {
+        case OSFP_TCP_OPT_EOL:
+            return 'E';
+        case OSFP_TCP_OPT_NOP:
+            return 'N';
+        case OSFP_TCP_OPT_MSS:
+            return 'M';
+        case OSFP_TCP_OPT_WSCALE:
+            return 'W';
+        case OSFP_TCP_OPT_SACKOK:
+            return 'S';
+        case OSFP_TCP_OPT_SACK:
+            return 'K';
+        case OSFP_TCP_OPT_ECHO:
+            return 'J';
+        case OSFP_TCP_OPT_ECHOREPLY:
+            return 'F';
+        case OSFP_TCP_OPT_TIMESTAMP:
+            return 'T';
+        case OSFP_TCP_OPT_POCONN:
+            return 'P';
+        case OSFP_TCP_OPT_POSVC:
+            return 'R';
+        default:
+            return 'U';
+    }
+}
+
+static unsigned int compute_ip_ttl(unsigned int ip_ttl)
+{
+    if (ip_ttl >= 0 && ip_ttl <= 32) {
+        ip_ttl = 32;
+    } else if (ip_ttl > 32 && ip_ttl <= 64) {
+        ip_ttl = 64;
+    } else if (ip_ttl > 64 && ip_ttl <= 128) {
+        ip_ttl = 128;
+    } else {
+        ip_ttl = 255;
+    }
+    return ip_ttl;
+}
+
+static unsigned int decode_tcp_options(struct osfp_tcp_opt *tcp_opts, unsigned int max_opt_cnt, unsigned char *data, unsigned int len)
+{
+    unsigned int offset = 0;
+    unsigned int tcp_opt_cnt = 0;
+
+    unsigned char type;
+    unsigned char olen;
+    unsigned char *odata;
+
+    while (offset < len && tcp_opt_cnt < max_opt_cnt) {
+        type = *(data + offset);
+
+        if (type == OSFP_TCP_OPT_EOL || type == OSFP_TCP_OPT_NOP) {
+            olen = 1;
+        } else {
+            olen = *(data + offset + 1);
+            if (olen < 2) {
+                break;
+            }
+        }
+
+        if (offset + olen > len) {
+            break;
+        }
+
+        odata = (olen > 2) ? (data + offset + 2) : NULL;
+
+        tcp_opts[tcp_opt_cnt].type = type;
+        tcp_opts[tcp_opt_cnt].len = olen;
+        tcp_opts[tcp_opt_cnt].data = odata;
+
+        offset += olen;
+        tcp_opt_cnt++;
+    }
+    return tcp_opt_cnt;
+}
+
+int osfp_fingerprint_to_json_buf(struct osfp_fingerprint *fp, char *strbuf, unsigned int buf_len, unsigned int format)
+{
+    int rlen = 0, ret, i;
+    cJSON *root;
+
+    if (fp == NULL || strbuf == NULL || buf_len == 0) {
+        return 0;
+    }
+
+    strbuf[0] = 0;
+
+    root = cJSON_CreateObject();
+    if (root == NULL) {
+        return 0;
+    }
+
+    for (i = 0; i < OSFP_FIELD_MAX; i++) {
+        if (fp->fields[i].enabled) {
+            switch (fp_fields[i].type) {
+                case OSFP_FIELD_TYPE_UINT:
+                    cJSON_AddNumberToObject(root, fp_fields[i].name, *(unsigned int *)fp->fields[i].value);
+                break;
+                case OSFP_FIELD_TYPE_STRING:
+                    cJSON_AddStringToObject(root, fp_fields[i].name, (char *)fp->fields[i].value);
+                    break;
+                default:
+                    break;
+            }
+        } else {
+            cJSON_AddNullToObject(root, fp_fields[i].name);
+        }
+    }
+
+    if (!cJSON_PrintPreallocated(root, strbuf, buf_len, format)) {
+        return 0;
+    }
+
+    cJSON_Delete(root);
+
+    return strlen(strbuf) + 1;
+}
+
+int osfp_fingerprint_from_json(struct osfp_fingerprint *fp, char *json_str)
+{
+    int ret, i;
+    cJSON *root;
+    cJSON *field;
+
+    void *value_ptr;
+    unsigned int value_len;
+
+    if (fp == NULL || json_str == NULL) {
+        goto exit;
+    }
+
+    memset(fp, 0, sizeof(struct osfp_fingerprint));
+
+    root = cJSON_Parse(json_str);
+    if (root == NULL) {
+        osfp_log_error("parse json: '%s'\n", json_str);
+        goto exit;
+    }
+
+    for (i = 0; i < OSFP_FIELD_OS; i++) {
+        if (!fp_fields[i].enabled) {
+            continue;
+        }
+    
+        field = cJSON_GetObjectItem(root, osfp_fingerprint_get_field_name(i));
+        if (field == NULL) {
+            goto exit;
+        }
+
+        switch (field->type) {
+            case cJSON_Number:
+                value_ptr = (void *)&field->valueint;
+                value_len = sizeof(field->valueint);
+                osfp_fingerprint_setup_field(fp, i, value_ptr, value_len);
+                break;
+            case cJSON_String:
+                value_ptr = (void *)field->valuestring;
+                value_len = strlen(field->valuestring) + 1;
+                osfp_fingerprint_setup_field(fp, i, value_ptr, value_len);
+                break;
+            case cJSON_NULL:
+                //printf("fingerprint parse error: %s\n%s\n", field->string, cJSON_Print(root));
+                break;
+            default:
+                goto exit;
+        }
+    }
+
+    return 0;
+exit:
+    return ret;
+}
+
+unsigned int osfp_fingerprint_get_field_enabled(enum osfp_field_id field_id)
+{
+    return fp_fields[field_id].enabled;
+}
+
+unsigned int osfp_fingerprint_get_field_importance(enum osfp_field_id field_id)
+{
+    return fp_fields[field_id].importance;
+}
+
+const char *osfp_fingerprint_get_field_name(enum osfp_field_id field_id)
+{
+    return fp_fields[field_id].name;
+}
+
+unsigned int osfp_fingerprint_get_field_type(enum osfp_field_id field_id)
+{
+    return fp_fields[field_id].type;
+}
+
+void osfp_fingerprint_setup_field(struct osfp_fingerprint *fp, enum osfp_field_id field_id, void *value, unsigned int len)
+{
+    fp->fields[field_id].name = osfp_fingerprint_get_field_name(field_id);
+    fp->fields[field_id].enabled = 1;
+
+    if (fp->value_buffer_used + len <= sizeof(fp->value_buffer)) {
+        memcpy(fp->value_buffer + fp->value_buffer_used, value, len);
+        fp->fields[field_id].value = fp->value_buffer + fp->value_buffer_used;
+        fp->fields[field_id].value_len = len;
+        fp->value_buffer_used += len;
+    } else {
+        fp->fields[field_id].value = NULL;
+        fp->fields[field_id].value_len = 0;
+    }
+}
+
+int osfp_fingerprinting_tcp_option(unsigned char *opt_data, unsigned int opt_len, struct osfp_fingerprint *fp)
+{
+    int ret,i;
+
+    unsigned int tcp_mss;
+    unsigned int tcp_ws;
+    unsigned int tcp_ter;
+    unsigned int tcp_opt_cnt;
+    struct osfp_tcp_opt tcp_opts[OSFP_TCP_OPTMAX];
+
+    char options[OSFP_TCP_OPTLENMAX];
+    char options_ordered[OSFP_TCP_OPTLENMAX];
+    unsigned int offset = 0;
+    unsigned int maxoffset = sizeof(options) - 3; //for shortest "E,"
+    unsigned int ordered_offset = 0;
+    unsigned int ordered_maxoffset = sizeof(options_ordered) - 1;
+
+    if (opt_data == NULL || opt_len == 0 || fp == NULL) {
+        goto exit;
+    }
+
+    tcp_opt_cnt = decode_tcp_options(tcp_opts, OSFP_TCP_OPTMAX, opt_data, opt_len);
+
+    for (i = 0; i < tcp_opt_cnt && offset < maxoffset && ordered_offset < ordered_maxoffset; i++) {
+        struct osfp_tcp_opt *opt = &tcp_opts[i];
+
+        char letter = option_to_ascii(opt->type);
+        options[offset++] = letter;
+        options_ordered[ordered_offset++] = letter;
+
+        switch (opt->type) {
+            case OSFP_TCP_OPT_EOL:
+            case OSFP_TCP_OPT_NOP:
+                break;
+            case OSFP_TCP_OPT_MSS:
+                if (opt->len != OSFP_TCP_OPT_MSS_LEN) {
+                    break;
+                }
+                tcp_mss = (unsigned int)ntohs(*(unsigned short *)opt->data);
+                osfp_fingerprint_setup_field(fp, OSFP_FIELD_TCP_MSS, &tcp_mss, sizeof(tcp_mss));
+                ret = snprintf(options + offset, sizeof(options), "%u", tcp_mss);
+                if (ret < 0 || offset + ret > maxoffset) {
+                    break;
+                }
+                offset += ret;
+                break;
+            case OSFP_TCP_OPT_WSCALE:
+                if (opt->len != OSFP_TCP_OPT_WS_LEN) {
+                    break;
+                }
+                tcp_ws = (unsigned int)*(unsigned char *)opt->data;
+                osfp_fingerprint_setup_field(fp, OSFP_FIELD_TCP_WINDOW_SCALING, &tcp_ws, sizeof(tcp_ws));
+                ret = snprintf(options + offset, sizeof(options), "%u", tcp_ws);
+                if (ret < 0 || offset + ret > maxoffset) {
+                    break;
+                }
+                offset += ret;
+                break;
+            case OSFP_TCP_OPT_TIMESTAMP:
+                if (opt->len != OSFP_TCP_OPT_TS_LEN) {
+                    break;
+                }
+                tcp_ter = ntohl(*(unsigned int *)(opt->data + 4));
+                osfp_fingerprint_setup_field(fp, OSFP_FIELD_TCP_TIMESTAMP_ECHO_REPLY, &tcp_ter, sizeof(tcp_ter));
+                ret = snprintf(options + offset, sizeof(options), "%u", tcp_ter);
+                if (ret < 0 || offset + ret > maxoffset) {
+                    break;
+                }
+                offset += ret;
+                break;
+            case OSFP_TCP_OPT_SACKOK:
+            case OSFP_TCP_OPT_SACK:
+            case OSFP_TCP_OPT_ECHO:
+            case OSFP_TCP_OPT_ECHOREPLY:
+            case OSFP_TCP_OPT_POCONN:
+            case OSFP_TCP_OPT_POSVC:
+                break;
+            default:
+                ret = snprintf(options + offset, sizeof(options), "%u", opt->type);
+                if (ret < 0 || offset + ret > maxoffset) {
+                    break;
+                }
+                offset += ret;
+        }
+
+        options[offset++] = ',';
+        options[offset] = 0;
+        options_ordered[ordered_offset] = 0;
+    }
+
+    osfp_fingerprint_setup_field(fp, OSFP_FIELD_TCP_OPTIONS, options, strlen(options) + 1);
+    osfp_fingerprint_setup_field(fp, OSFP_FIELD_TCP_OPTIONS_ORDERED, options_ordered, strlen(options_ordered) + 1);
+
+    return 0;
+exit:
+    return -1;
+}
+
+int osfp_fingerprinting_tcp(struct tcphdr *tcph, unsigned int tcph_len, struct osfp_fingerprint *fp)
+{
+    unsigned int tcp_off;
+    unsigned int tcp_window_size;
+    unsigned int tcp_flags;
+
+    if (tcph == NULL || tcph_len > OSFP_TCP_DATA_OFF_MAX || fp == NULL) {
+        goto exit;
+    }
+
+    tcp_off = tcph->doff << 2;
+    tcp_window_size = ntohs(tcph->window);
+    tcp_flags = *((unsigned char *)&tcph->window - 1);
+
+    if (tcp_off != tcph_len) {
+        goto exit;
+    }
+
+    osfp_fingerprint_setup_field(fp, OSFP_FIELD_TCP_OFF, &tcp_off, sizeof(tcp_off));
+    osfp_fingerprint_setup_field(fp, OSFP_FIELD_TCP_WINDOW_SIZE, &tcp_window_size, sizeof(tcp_window_size));
+    osfp_fingerprint_setup_field(fp, OSFP_FIELD_TCP_FLAGS, &tcp_flags, sizeof(tcp_flags));
+
+    // tcp options
+    if (tcp_off > OSFP_TCP_HEADER_LEN) {
+        osfp_fingerprinting_tcp_option((unsigned char *)tcph + OSFP_TCP_HEADER_LEN, tcp_off - OSFP_TCP_HEADER_LEN, fp);
+    }
+
+    return 0;
+exit:
+    return -1;
+}
+
+int osfp_fingerprinting_ipv4(struct iphdr *iph, struct osfp_fingerprint *fp)
+{
+    if (iph == NULL || fp == NULL) {
+        goto exit;
+    }
+
+    unsigned int ip_id = !!iph->id;
+    unsigned int ip_tos = iph->tos;
+    unsigned int ip_total_length = ntohs(iph->tot_len);
+    unsigned int ip_ttl = compute_ip_ttl(iph->ttl);
+
+    osfp_fingerprint_setup_field(fp, OSFP_FIELD_IP_ID, &ip_id, sizeof(ip_id));
+    osfp_fingerprint_setup_field(fp, OSFP_FIELD_IP_TOS, &ip_tos, sizeof(ip_tos));
+    osfp_fingerprint_setup_field(fp, OSFP_FIELD_IP_TOTAL_LENGTH, &ip_total_length, sizeof(ip_total_length));
+    osfp_fingerprint_setup_field(fp, OSFP_FIELD_IP_TTL, &ip_ttl, sizeof(ip_ttl));
+
+    return 0;
+exit:
+    return -1;
+}
+
+int osfp_fingerprinting_ipv6(struct ipv6hdr *iph, struct osfp_fingerprint *fp)
+{
+    if (iph == NULL || fp == NULL) {
+        goto exit;
+    }
+
+    //unsigned int ip_id = 0;
+    //unsigned int ip_tos = 0;
+    unsigned int ip_total_length = OSFP_IPV6_HEADER_LEN + ntohs(iph->payload_len);
+    unsigned int ip_ttl = compute_ip_ttl(iph->hop_limit);
+
+    //osfp_fingerprint_setup_field(fp, OSFP_FIELD_IP_ID, &ip_id, sizeof(ip_id));
+    //osfp_fingerprint_setup_field(fp, OSFP_FIELD_IP_TOS, &ip_tos, sizeof(ip_tos));
+    osfp_fingerprint_setup_field(fp, OSFP_FIELD_IP_TOTAL_LENGTH, &ip_total_length, sizeof(ip_total_length));
+    osfp_fingerprint_setup_field(fp, OSFP_FIELD_IP_TTL, &ip_ttl, sizeof(ip_ttl));
+
+    return 0;
+exit:
+    return -1;
+}
+
+int osfp_fingerprinting(unsigned char *iph, unsigned char *tcph, unsigned int tcph_len, struct osfp_fingerprint *fp, unsigned int ip_version)
+{
+    int ret = OSFP_EINVAL;
+
+    if (iph == NULL || tcph == NULL || fp == NULL) {
+        goto exit;
+    }
+
+    memset(fp, 0, sizeof(struct osfp_fingerprint));
+
+    switch (ip_version) {
+        case 4:
+            ret = osfp_fingerprinting_ipv4((struct iphdr *)iph, fp);
+            break;
+        case 6:
+            ret = osfp_fingerprinting_ipv6((struct ipv6hdr *)iph, fp);
+            break;
+        default:
+            ret = -1;
+            goto exit;
+    }
+
+    if (ret != 0) {
+        goto exit;
+    }
+
+    ret = osfp_fingerprinting_tcp((struct tcphdr *)tcph, tcph_len, fp);
+    if (ret != 0) {
+        goto exit;
+    }
+
+    osfp_fingerprint_setup_field(fp, OSFP_FIELD_OS, OSFP_FINGERPRINT_DEFAULT_OS_CLASS_NAME, strlen(OSFP_FINGERPRINT_DEFAULT_OS_CLASS_NAME) + 1);
+
+    return 0;
+exit:
+    return -1;
+}
+
+#ifdef UNITTEST
+int test_osfp_fingerprinting_ipv4(void)
+{
+    int ret;
+    char iph[] = {
+        0x45, 0x00, 0x00, 0x34, 0x51, 0xc4, 0x40, 0x00,
+        0x80, 0x06, 0xe7, 0x27, 0xc0, 0xa8, 0x73, 0x08,
+        0x6a, 0xb9, 0x23, 0x6e
+    };
+
+    char tcph[] = {
+        0xc1, 0xbd, 0x00, 0x50, 0x3d, 0x58, 0x51, 0x60,
+        0x00, 0x00, 0x00, 0x00, 0x80, 0x02, 0x20, 0x00,
+        0x3d, 0x3a, 0x00, 0x00, 0x02, 0x04, 0x04, 0xec,
+        0x01, 0x03, 0x03, 0x08, 0x01, 0x01, 0x04, 0x02
+    };
+
+    char str_buf[2048] = "";
+    const char *target = "{\"ip_id\":1,\"ip_tos\":0,\"ip_total_length\":52,\"ip_ttl\":128,\"tcp_off\":32,\"tcp_timestamp\":null,\"tcp_timestamp_echo_reply\":null,\"tcp_window_scaling\":8,\"tcp_window_size\":8192,\"tcp_flags\":2,\"tcp_mss\":1260,\"tcp_options\":\"M1260,N,W8,N,N,S,\",\"tcp_options_ordered\":\"MNWNNS\",\"os\":\"OSFP_UNKNOWN\"}";
+    struct osfp_fingerprint fp = {0};
+
+    ret = osfp_fingerprinting(iph, tcph, 32, &fp, 4);
+    if (ret != 0) {
+        goto exit;
+    }
+
+    ret = osfp_fingerprint_to_json_buf(&fp, str_buf, 2048, 0);
+    if (ret <= 0) {
+        goto exit;
+    }
+
+    if (0 != memcmp(str_buf, target, strlen(target))) {
+        goto exit;
+    }
+
+    return 0;
+exit:
+    return ret;
+}
+
+int test_osfp_fingerprinting_ipv6(void)
+{
+    int ret;
+    char iph[] = {
+        0x45, 0x00, 0x00, 0x34, 0x51, 0xc4, 0x40, 0x00,
+        0x80, 0x06, 0xe7, 0x27, 0xc0, 0xa8, 0x73, 0x08,
+        0x6a, 0xb9, 0x23, 0x6e
+    };
+
+    char tcph[] = {
+        0xc1, 0xbd, 0x00, 0x50, 0x3d, 0x58, 0x51, 0x60,
+        0x00, 0x00, 0x00, 0x00, 0x80, 0x02, 0x20, 0x00,
+        0x3d, 0x3a, 0x00, 0x00, 0x02, 0x04, 0x04, 0xec,
+        0x01, 0x03, 0x03, 0x08, 0x01, 0x01, 0x04, 0x02
+    };
+
+    char str_buf[2048] = "";
+    const char *target = "{\"ip_id\":1,\"ip_tos\":0,\"ip_total_length\":52,\"ip_ttl\":128,\"tcp_off\":32,\"tcp_timestamp\":null,\"tcp_timestamp_echo_reply\":null,\"tcp_window_scaling\":8,\"tcp_window_size\":8192,\"tcp_flags\":2,\"tcp_mss\":1260,\"tcp_options\":\"M1260,N,W8,N,N,S,\",\"tcp_options_ordered\":\"MNWNNS\",\"os\":\"OSFP_UNKNOWN\"}";
+    struct osfp_fingerprint fp = {0};
+
+    ret = osfp_fingerprinting(iph, tcph, 32, &fp, 4);
+    if (ret != 0) {
+        goto exit;
+    }
+
+    ret = osfp_fingerprint_to_json_buf(&fp, str_buf, 2048, 0);
+    if (ret <= 0) {
+        goto exit;
+    }
+
+    if (0 != memcmp(str_buf, target, strlen(target))) {
+        goto exit;
+    }
+
+    return 0;
+exit:
+    return ret;
+}
+
+int test_osfp_fingerprinting_tcp_option(void)
+{
+    int ret;
+    char tcp_opt[] = {
+        0x02, 0x04, 0x04, 0xec,0x01, 0x03, 0x03, 0x08,
+        0x01, 0x01, 0x04, 0x02
+    };
+
+    char str_buf[2048] = "";
+    const char *target_options = "M1260,N,W8,N,N,S,";
+    const char *target_options_ordered = "MNWNNS";
+
+    struct osfp_fingerprint fp = {0};
+
+    ret = osfp_fingerprinting_tcp_option((unsigned char *)tcp_opt, 12, &fp);
+    if (ret != 0) {
+        goto exit;
+    }
+
+    if (fp.fields[OSFP_FIELD_TCP_OPTIONS].value_len != strlen(target_options) + 1)
+    {
+        goto exit;
+    }
+
+    if (0 != memcmp(fp.fields[OSFP_FIELD_TCP_OPTIONS].value, target_options, strlen(target_options) + 1)) {
+        goto exit;
+    }
+
+    if (fp.fields[OSFP_FIELD_TCP_OPTIONS_ORDERED].value_len != strlen(target_options_ordered) + 1) {
+        goto exit;
+    }
+
+    if (0 != memcmp(fp.fields[OSFP_FIELD_TCP_OPTIONS_ORDERED].value, target_options_ordered, strlen(target_options_ordered) + 1)) {
+        goto exit;
+    }
+
+    return 0;
+exit:
+    return ret;
+}
+#endif
--- a/src/osfp_fingerprint.h
+++ b/src/osfp_fingerprint.h
@@ -0,0 +1,66 @@
+#ifndef __OSFP_FINGERPRINT_H__
+#define __OSFP_FINGERPRINT_H__
+
+#define OSFP_FINGERPRINT_VALUE_BUFFER_MAX 128
+
+enum osfp_field_id {
+    OSFP_FIELD_IP_ID,
+    OSFP_FIELD_IP_TOS,
+    OSFP_FIELD_IP_TOTAL_LENGTH,
+    OSFP_FIELD_IP_TTL,
+    OSFP_FIELD_TCP_OFF,
+    OSFP_FIELD_TCP_TIMESTAMP,
+    OSFP_FIELD_TCP_TIMESTAMP_ECHO_REPLY,
+    OSFP_FIELD_TCP_WINDOW_SCALING,
+    OSFP_FIELD_TCP_WINDOW_SIZE,
+    OSFP_FIELD_TCP_FLAGS,
+    OSFP_FIELD_TCP_MSS,
+    OSFP_FIELD_TCP_OPTIONS,
+    OSFP_FIELD_TCP_OPTIONS_ORDERED,
+    OSFP_FIELD_OS,
+    OSFP_FIELD_MAX,
+};
+
+enum osfp_field_type {
+    OSFP_FIELD_TYPE_UNKNOWN,
+    OSFP_FIELD_TYPE_UINT,
+    OSFP_FIELD_TYPE_STRING,
+    OSFP_FIELD_TYPE_MAX
+};
+
+struct osfp_fingerprint_field {
+    const char      *name;
+    unsigned int    enabled;
+    unsigned int    type;
+    unsigned int    importance;
+    void            *value;
+    unsigned int    value_len;
+};
+
+struct osfp_fingerprint {
+    struct osfp_fingerprint_field fields[OSFP_FIELD_MAX];
+    char                        value_buffer[OSFP_FINGERPRINT_VALUE_BUFFER_MAX];
+    unsigned int                value_buffer_used;
+};
+
+int osfp_fingerprint_to_json_buf(struct osfp_fingerprint *fp, char *strbuf, unsigned int buf_len, unsigned int format);
+
+void osfp_fingerprint_setup_field(struct osfp_fingerprint *fp, enum osfp_field_id field_id, void *value, unsigned int len);
+
+const char *osfp_fingerprint_get_field_name(enum osfp_field_id field_id);
+unsigned int osfp_fingerprint_get_field_enabled(enum osfp_field_id field_id);
+unsigned int osfp_fingerprint_get_field_importance(enum osfp_field_id field_id);
+unsigned int osfp_fingerprint_get_field_type(enum osfp_field_id field_id);
+
+int osfp_fingerprinting_tcp_option(unsigned char *pkt, unsigned int pktlen, struct osfp_fingerprint *fp);
+int osfp_fingerprinting_tcp(struct tcphdr *tcph, unsigned int tcph_len, struct osfp_fingerprint *fp);
+int osfp_fingerprinting_ipv4(struct iphdr *iph, struct osfp_fingerprint *fp);
+int osfp_fingerprinting_ipv6(struct ipv6hdr *iph, struct osfp_fingerprint *fp);
+int osfp_fingerprinting(unsigned char *iph, unsigned char *tcph, unsigned int tcph_len, struct osfp_fingerprint *fp, unsigned int ip_version);
+
+#ifdef UNITTEST
+int test_osfp_fingerprinting_ipv4(void);
+int test_osfp_fingerprinting_ipv6(void);
+int test_osfp_fingerprinting_tcp_option(void);
+#endif
+#endif
--- a/src/osfp_log.c
+++ b/src/osfp_log.c
@@ -0,0 +1,57 @@
+#include "osfp_common.h"
+#include "osfp_log.h"
+
+/* The maximum length of the log message */
+#define OSFP_MAX_LOG_MSG_LEN 2048
+
+unsigned int g_osfp_log_level = OSFP_LOG_LEVEL_WARNING;
+
+void osfp_log_message(unsigned int x, const char *file, const int line, const char *func, const char *msg)
+{
+    char buffer[OSFP_MAX_LOG_MSG_LEN] = "";
+    char log_time_buf[128];
+    time_t now;
+    struct tm tm_now;
+
+    time(&now);
+    localtime_r(&now, &tm_now);
+    strftime(log_time_buf, sizeof(log_time_buf), "%Y-%m-%d %T", &tm_now);
+
+    switch (x) {
+        case OSFP_LOG_LEVEL_DEBUG:
+            snprintf(buffer, sizeof(buffer), "[%s][DEBUG][%s:%d %s] %s\n", log_time_buf, file, line, func, msg);
+            break;
+        case OSFP_LOG_LEVEL_INFO:
+            snprintf(buffer, sizeof(buffer), "[%s][INFO][%s:%d %s] %s\n", log_time_buf, file, line, func, msg);
+            break;
+        case OSFP_LOG_LEVEL_WARNING:
+            snprintf(buffer, sizeof(buffer), "[%s][WARN][%s:%d %s] %s\n", log_time_buf, file, line, func, msg);
+            break;
+        case OSFP_LOG_LEVEL_ERROR:
+            snprintf(buffer, sizeof(buffer), "[%s][ERROR][%s:%d %s] %s\n", log_time_buf, file, line, func, msg);
+            break;
+    }
+
+    if (fprintf(stdout, "%s\n", buffer) < 0) {
+        printf("Error writing to stream using fprintf\n");
+    }
+    fflush(stdout);
+}
+
+void osfp_log(unsigned int x, const char *file, const int line, const char *func, const char *fmt, ...)
+{
+    if (g_osfp_log_level <= x ) {
+        char msg[OSFP_MAX_LOG_MSG_LEN];
+        va_list ap;
+        va_start(ap, fmt);
+        vsnprintf(msg, sizeof(msg), fmt, ap);
+        va_end(ap);
+        osfp_log_message(x, file, line, func, msg);
+    }
+}
+
+void osfp_log_level_set(enum osfp_log_level level)
+{
+    g_osfp_log_level = level;
+}
+
--- a/src/osfp_log.h
+++ b/src/osfp_log.h
@@ -0,0 +1,24 @@
+#ifndef __OSFP_LOG_H__
+#define __OSFP_LOG_H__
+
+enum osfp_log_level {
+    OSFP_LOG_LEVEL_DEBUG,
+    OSFP_LOG_LEVEL_INFO,
+    OSFP_LOG_LEVEL_WARNING,
+    OSFP_LOG_LEVEL_ERROR
+};
+
+#ifndef DEBUGLOG
+#define osfp_log_debug(...) do { } while (0)
+#else
+#define osfp_log_debug(...) osfp_log(OSFP_LOG_LEVEL_DEBUG, __FILE__, __LINE__, __FUNCTION__, __VA_ARGS__)
+#endif
+#define osfp_log_info(...) osfp_log(OSFP_LOG_LEVEL_INFO, __FILE__, __LINE__, __FUNCTION__, __VA_ARGS__)
+#define osfp_log_warning(...) osfp_log(OSFP_LOG_LEVEL_WARNING, __FILE__, __LINE__, __FUNCTION__, __VA_ARGS__)
+#define osfp_log_error(...) osfp_log(OSFP_LOG_LEVEL_ERROR, __FILE__, __LINE__,  __FUNCTION__,__VA_ARGS__)
+
+
+void osfp_log_level_set(enum osfp_log_level level);
+void osfp_log(unsigned int x, const char *file, const int line, const char *func, const char *fmt, ...);
+
+#endif
--- a/src/osfp_score_db.c
+++ b/src/osfp_score_db.c
@@ -0,0 +1,622 @@
+#include "osfp_common.h"
+
+#include "osfp.h"
+#include "osfp_fingerprint.h"
+#include "osfp_score_db.h"
+#include "osfp_log.h"
+
+#define PERFECT_SCORE_EXPECTED_RATE 0.5f
+#define FIELD_VALUE_DUP_RATE_MAX 0.5f
+
+#define OSFP_SCORE_DB_FIELD_UINT_VALUE_MAX 65536
+
+struct osfp_score_db_array_data {
+    struct osfp_os_class_score *array_head;
+    unsigned int    array_len;
+};
+
+struct osfp_score_db_hash_element {
+    char *key;
+    unsigned int keylen;
+    struct osfp_os_class_score *score;
+    UT_hash_handle hh;
+};
+
+struct osfp_score_db_hash_data {
+    struct osfp_score_db_hash_element  *hash_head;
+};
+
+int osfp_score_db_array_add(void *data, struct osfp_os_class_score *os_class_score, void *value, unsigned int len)
+{
+    int ret = -1, i;
+    unsigned int index;
+    struct osfp_score_db_array_data *array_data = (struct osfp_score_db_array_data *)data;
+
+    if (array_data == NULL || os_class_score == NULL || value == NULL || len != sizeof(unsigned int)) {
+        goto exit;
+    }
+
+    if (array_data->array_head == NULL || array_data->array_len == 0) {
+        goto exit;
+    }
+
+    index = *(unsigned int *)value;
+
+    if (index >= array_data->array_len) {
+        goto exit;
+    }
+
+    for (i = 0; i < OSFP_OS_CLASS_MAX; i++) {
+        array_data->array_head[index].scores[i] += os_class_score->scores[i];
+    }
+
+    return 0;
+exit:
+    return ret;
+}
+
+struct osfp_os_class_score *osfp_score_db_array_match(void *data, void *value, unsigned int len)
+{
+    unsigned int index;
+    struct osfp_score_db_array_data *array_data = (struct osfp_score_db_array_data *)data;
+
+    if (array_data == NULL || value == NULL || len != sizeof(unsigned int)) {
+        return NULL;
+    }
+
+    if (array_data->array_head == NULL || array_data->array_len == 0) {
+        return NULL;
+    }
+
+    index = *(unsigned int *)value;
+
+    if (index >= array_data->array_len) {
+        return NULL;
+    }
+
+    return &((array_data->array_head)[index]);
+}
+
+void *osfp_score_db_array_create(void)
+{
+    struct osfp_score_db_array_data *array_data = calloc(1, sizeof(struct osfp_score_db_array_data));
+    if (array_data == NULL) {
+        return NULL;
+    }
+
+    array_data->array_head = calloc(OSFP_SCORE_DB_FIELD_UINT_VALUE_MAX, sizeof(struct osfp_os_class_score));
+    if (array_data->array_head == NULL) {
+        free(array_data);
+        return NULL;
+    }
+
+    array_data->array_len = OSFP_SCORE_DB_FIELD_UINT_VALUE_MAX;
+
+    return (void *)array_data;
+}
+
+void osfp_score_db_array_destroy(void *data) {
+    struct osfp_score_db_array_data *array_data = (struct osfp_score_db_array_data *)data;
+
+    if (array_data) {
+        if (array_data->array_head) {
+            free(array_data->array_head);
+        }
+        free(array_data);
+    }
+}
+
+int osfp_score_db_hash_add(void *data, struct osfp_os_class_score *os_class_score, void *value, unsigned int len)
+{
+    int ret = -1, i;
+    struct osfp_score_db_hash_data *hash_data = (struct osfp_score_db_hash_data *)data;
+    struct osfp_score_db_hash_element *element = NULL;
+
+    if (hash_data == NULL || os_class_score == NULL || value == NULL || len == 0) {
+        goto exit;
+    }
+
+    HASH_FIND(hh, hash_data->hash_head, value, len, element);
+    if (element == NULL) {
+        element = (struct osfp_score_db_hash_element *)calloc(1, sizeof(struct osfp_score_db_hash_element));
+        if (element == NULL) {
+            goto exit;
+        }
+        element->key = strdup(value);
+        element->keylen = len;
+        element->score = (struct osfp_os_class_score *)calloc(1, sizeof(struct osfp_os_class_score));
+        if (element->score == NULL) {
+            free(element);
+            element = NULL;
+            goto exit;
+        }
+        HASH_ADD_KEYPTR(hh, hash_data->hash_head, element->key, element->keylen, element);
+    }
+
+    for (i = 0; i < OSFP_OS_CLASS_MAX; i++) {
+        element->score->scores[i] += os_class_score->scores[i];
+    }
+
+    return 0;
+exit:
+    return ret;
+}
+
+struct osfp_os_class_score *osfp_score_db_hash_match(void *data, void *value, unsigned int len)
+{
+    struct osfp_score_db_hash_data *hash_data = (struct osfp_score_db_hash_data *)data;
+    struct osfp_score_db_hash_element *element = NULL;
+
+    if (data == NULL || value == NULL || len == 0) {
+        return NULL;
+    }
+
+    if (hash_data->hash_head == NULL) {
+        return NULL;
+    }
+
+    HASH_FIND(hh, hash_data->hash_head, value, len, element);
+    if (element == NULL) {
+        return NULL;
+    }
+
+    return element->score;
+}
+
+void *osfp_score_db_hash_create(void)
+{
+    return (void*)calloc(1, sizeof(struct osfp_score_db_hash_data));
+}
+
+void osfp_score_db_hash_destroy(void *data) {
+    struct osfp_score_db_hash_data *hash_data = (struct osfp_score_db_hash_data *)data;
+    struct osfp_score_db_hash_element *element = NULL;
+    struct osfp_score_db_hash_element *tmp = NULL;
+
+    if (hash_data) {
+        if (hash_data->hash_head) {
+            HASH_ITER(hh, hash_data->hash_head, element, tmp) {
+                HASH_DELETE(hh, hash_data->hash_head, element);
+                if (element) {
+                    if (element->key) {
+                        free(element->key);
+                    }
+                    if (element->score) {
+                        free(element->score);
+                    }
+                    free(element);
+                }
+            }
+        }
+        free(hash_data);
+    }
+}
+
+char *osfp_score_db_read_file(char *fp_file)
+{
+    int ret = -1;
+    char *file_buffer = NULL;
+    unsigned int file_len = 0;
+    FILE *fp = NULL;
+    struct stat st;
+
+    if (0 > stat(fp_file, &st)) {
+        osfp_log_error("stat() failed on '%s'.\n", fp_file);
+        goto exit;
+    }
+
+    if (st.st_size == 0) { 
+        osfp_log_error("Empty file: '%s'.\n", fp_file);
+        goto exit;
+    }
+
+    file_len = (unsigned int)st.st_size;
+    file_buffer = malloc(file_len + 1);
+    if (file_buffer == NULL) {
+        osfp_log_error("Not enough memory for file buffer. file name: '%s'\n",fp_file);
+        goto exit;
+    }
+
+    fp = fopen(fp_file, "r");
+    if (fp == NULL) {
+        osfp_log_error("Cannot open '%s' for reading.\n", fp_file);
+        goto exit;
+    }
+
+    ret = fread(file_buffer, 1, file_len, fp);
+    if (ret < 0) {
+        osfp_log_error("fread() failed on '%s'.\n", fp_file);
+        free(file_buffer);
+        fclose(fp);
+        goto exit;
+    }
+
+    fclose(fp);
+
+    file_buffer[file_len] = 0;
+
+    return file_buffer;
+exit:
+    return NULL;
+}
+
+int osfp_score_db_load_field(struct osfp_field_score_db *db, cJSON *field, enum osfp_os_class_id os_class)
+{
+    int ret = -1;
+    struct osfp_os_class_score os_class_score = {0};
+
+    void *value_ptr;
+    unsigned int value_len;
+
+    switch (field->type) {
+        case cJSON_Number:
+            value_ptr = (void *)&field->valueint;
+            value_len = sizeof(field->valueint);
+            break;
+        case cJSON_String:
+            value_ptr = (void *)field->valuestring;
+            value_len = strlen(field->valuestring) + 1;
+            break;
+        case cJSON_NULL:
+            ret = 0;
+            goto exit;
+        default:
+            goto exit;
+    }
+
+    os_class_score.scores[os_class] = 1;
+
+    ret = db->add(db->data, &os_class_score, value_ptr, value_len);
+    if (ret != 0) {
+        goto exit;
+    }
+
+    db->entry_count++;
+
+    return 0;
+exit:
+    return ret;
+}
+
+int osfp_score_db_load_entry(struct osfp_score_db *score_db, cJSON *entry)
+{
+    int ret = -1, i;
+    cJSON *field = NULL;
+    struct osfp_field_score_db *db;
+    enum osfp_os_class_id os_class;
+
+    if (score_db == NULL || entry == NULL) {
+        goto exit;
+    }
+
+    field = cJSON_GetObjectItem(entry, osfp_fingerprint_get_field_name(OSFP_FIELD_OS));
+    if (field == NULL || field->valuestring == NULL) {
+        goto exit;
+    }
+
+    os_class = osfp_os_class_name_to_id(field->valuestring);
+    if (os_class >= OSFP_OS_CLASS_MAX) {
+        goto exit;
+    }
+
+    for (i = 0; i < OSFP_FIELD_OS; i++) {
+        db = &score_db->field_score_dbs[i];
+        if (db == NULL) {
+            goto exit;
+        }
+
+        if (!db->enabled) {
+            continue;
+        }
+
+        field = cJSON_GetObjectItem(entry, osfp_fingerprint_get_field_name(i));
+        if (field == NULL) {
+            osfp_log_info("json entry missing field: %s\n%s\n",
+                        osfp_fingerprint_get_field_name(i), cJSON_Print(entry));
+            continue;
+        }
+
+        ret = osfp_score_db_load_field(db, field, os_class);
+        if (ret != 0) {
+            osfp_log_info("json entry field load failed. field: %s\n%s\n",
+                        osfp_fingerprint_get_field_name(i), cJSON_Print(entry));
+            continue;
+        }
+    }
+
+    score_db->entry_count++;
+    score_db->os_class_entry_count[os_class]++;
+
+    return 0;
+exit:
+    return ret;
+}
+
+int osfp_score_db_load(struct osfp_score_db *score_db, char *fp_file)
+{
+    int ret = OSFP_EINVAL, i, count;
+    char *file_buffer;
+    cJSON *root = NULL;
+    cJSON *entry;
+    struct osfp_field_score_db *field_score_db;
+
+    if (score_db == NULL) {
+        goto exit;
+    }
+
+    file_buffer = osfp_score_db_read_file(fp_file);
+    if (file_buffer == NULL) {
+        osfp_log_error("read file: '%s'\n", fp_file);
+        ret = OSFP_ERR_SCORE_DB_READ_FILE;
+        goto exit;
+    }
+
+    root = cJSON_Parse(file_buffer);
+    if (root == NULL) {
+        osfp_log_error("parse json: '%s'\n", fp_file);
+        ret = OSFP_ERR_SCORE_DB_PARSE_FILE;
+        goto exit;
+    }
+
+    count = cJSON_GetArraySize(root);
+
+    for (i = 0; i < count; i++) {
+        entry = cJSON_GetArrayItem(root, i);
+        if (entry) {
+            ret = osfp_score_db_load_entry(score_db, entry);
+            if (ret != 0) {
+                osfp_log_debug("json entry load failed.\n%s\n", cJSON_Print(entry));
+                continue;
+            }
+        }
+    }
+
+    for (i = 0; i < OSFP_FIELD_MAX; i++) {
+        field_score_db = &score_db->field_score_dbs[i];
+        if (field_score_db->enabled && i != OSFP_FIELD_TCP_OPTIONS) {
+            score_db->perfect_score += osfp_fingerprint_get_field_importance(i);
+        }
+    }
+
+    score_db->perfect_score = score_db->perfect_score * PERFECT_SCORE_EXPECTED_RATE;
+
+    ret = OSFP_NOERR;
+exit:
+    if (root) {
+        cJSON_Delete(root);
+    }
+    if (file_buffer) {
+        free((char*)file_buffer);
+    }
+    return ret;
+}
+
+int osfp_score_db_score(struct osfp_score_db *score_db, unsigned int flags, struct osfp_fingerprint *fp, struct osfp_os_class_score *result_score)
+{
+    int ret = OSFP_EINVAL, i, j;
+
+    unsigned int tmp_score;
+    unsigned int perfect_score;
+    unsigned int entry_count;
+    unsigned int importance;
+
+    struct osfp_os_class_score *os_class_score_matched;
+    enum osfp_os_class_id os_class_id;
+
+    struct osfp_fingerprint_field *field;
+    struct osfp_field_score_db *field_score_db;
+
+    if (score_db == NULL || fp == NULL || result_score == NULL) {
+        goto exit;
+    }
+
+    memset(result_score, 0, sizeof(struct osfp_os_class_score));
+
+    perfect_score = score_db->perfect_score;
+    if (perfect_score == 0) {
+        goto exit;
+    }
+
+    for (i = 0; i < OSFP_FIELD_MAX; i++) {
+        field_score_db = &score_db->field_score_dbs[i];
+        if (!field_score_db->enabled) {
+            continue;
+        }
+
+        field = &fp->fields[i];
+        if (!field->enabled) {
+            continue;
+        }
+
+        os_class_score_matched = field_score_db->match(field_score_db->data, field->value, field->value_len);
+        if (os_class_score_matched == NULL) {
+            continue;
+        }
+
+        importance = osfp_fingerprint_get_field_importance(i);
+
+        for (j = 0; j < OSFP_OS_CLASS_MAX; j++) {
+            entry_count = score_db->os_class_entry_count[j];
+            tmp_score = os_class_score_matched->scores[j];
+            tmp_score = tmp_score < (entry_count * FIELD_VALUE_DUP_RATE_MAX) ? tmp_score : (entry_count * FIELD_VALUE_DUP_RATE_MAX);
+            if (entry_count == 0 || tmp_score == 0) {
+                continue;
+            }
+            if (0 == flags || flags & OSFP_BIT_U32(j)) {
+                osfp_log_debug("%s %s: ((%d * %u / %u) * %u ) / %u\n", osfp_fingerprint_get_field_name(i), osfp_os_class_id_to_name(j), OSFP_PERCENTILE, importance, perfect_score, os_class_score_matched->scores[j], entry_count);
+                result_score->scores[j] += ((OSFP_PERCENTILE * importance / perfect_score) * tmp_score) / entry_count;
+            }
+        }
+    }
+
+    return OSFP_NOERR;
+exit:
+    return ret;
+}
+
+void osfp_score_db_debug_print(struct osfp_score_db *score_db)
+{
+    int i;
+    printf("score_db:\n");
+    printf("entry_count: %u\n", score_db->entry_count);
+    printf("perfect_score: %u\n", score_db->perfect_score);
+
+    for (i = 0; i < OSFP_OS_CLASS_MAX; i++) {
+        const char *name = osfp_os_class_id_to_name(i);
+        printf("os class %s ", name);
+
+        printf("entry_count: %u\n", score_db->os_class_entry_count[i]);
+        printf("os class %s entry_count: %u\n", osfp_os_class_id_to_name(i), score_db->os_class_entry_count[i]);
+    }
+
+    for (i = 0; i < OSFP_FIELD_MAX; i++) {
+        printf("field %s enabled: %u\n", osfp_fingerprint_get_field_name(i), score_db->field_score_dbs[i].enabled);
+        printf("field %s type: %u\n", osfp_fingerprint_get_field_name(i), score_db->field_score_dbs[i].type);
+        printf("field %s entry_count: %u\n", osfp_fingerprint_get_field_name(i), score_db->field_score_dbs[i].entry_count);
+    }
+}
+
+struct osfp_score_db *osfp_score_db_create(void)
+{
+    int i;
+    struct osfp_score_db *score_db;
+    struct osfp_field_score_db *db;
+
+    score_db = calloc(1, sizeof(struct osfp_score_db));
+    if (score_db == NULL) {
+        goto exit;
+    }
+
+    for (i = 0; i < OSFP_FIELD_MAX; i++) {
+        db = &score_db->field_score_dbs[i];
+
+        db->enabled = osfp_fingerprint_get_field_enabled(i);
+        if (!db->enabled) {
+            osfp_log_info("fingerprint field disabled: %s", osfp_fingerprint_get_field_name(i));
+            continue;
+        }
+
+        db->type = osfp_fingerprint_get_field_type(i);
+        switch (db->type) {
+            case OSFP_FIELD_TYPE_UINT:
+                db->create = osfp_score_db_array_create;
+                db->destroy = osfp_score_db_array_destroy;
+                db->add = osfp_score_db_array_add;
+                db->match = osfp_score_db_array_match;
+                break;
+            case OSFP_FIELD_TYPE_STRING:
+                db->create = osfp_score_db_hash_create;
+                db->destroy = osfp_score_db_hash_destroy;
+                db->add = osfp_score_db_hash_add;
+                db->match = osfp_score_db_hash_match;
+                break;
+            default:
+                osfp_log_debug("fingerprint field unsupported type: %u", db->type);
+                goto exit;
+        }
+
+        db->data = db->create();
+        if (db->data == NULL) {
+            osfp_log_debug("field db create failed. field: %s", osfp_fingerprint_get_field_name(i));
+            goto exit;
+        }
+    }
+
+    return score_db;
+exit:
+    if (score_db) {
+        osfp_score_db_destroy(score_db);
+    }
+    return NULL;
+}
+
+void osfp_score_db_destroy(struct osfp_score_db *score_db)
+{
+    int i;
+    struct osfp_field_score_db *db;
+
+    if (score_db) {
+        for (i = 0; i < OSFP_FIELD_MAX; i++) {
+            db = &score_db->field_score_dbs[i];
+            if (db->destroy && db->data) {
+                db->destroy(db->data);
+                db->data = NULL;
+            }
+        }
+        free(score_db);
+    }
+}
+
+#ifdef UNITTEST
+int test_osfp_score_db(void)
+{
+    int ret, i;
+    struct osfp_score_db *db;
+    const char *test_file_path = "./.fp.json";
+    const char *fingerprint_file_content = "["
+        "  {"
+        "    \"tcp_options\": \"M1432,S,T,N,W9,\","
+        "    \"tcp_options_ordered\": \"MSTNW\","
+        "    \"ip_total_length\": 60,"
+        "    \"tcp_off\": 10,"
+        "    \"tcp_window_scaling\": 9,"
+        "    \"tcp_window_size\": 65535,"
+        "    \"ip_ttl\": 64,"
+        "    \"ip_id\": 1,"
+        "    \"tcp_timestamp\": 1,"
+        "    \"tcp_timestamp_echo_reply\": 0,"
+        "    \"tcp_mss\": 1432,"
+        "    \"tcp_flags\": 2,"
+        "    \"ip_tos\": 0,"
+        "    \"os\": \"Android\""
+        "  }"
+        "]";
+
+    db = (void *)osfp_score_db_create();
+    if (db == NULL) {
+        goto exit;
+    }
+
+    FILE *fingerprint_file_ptr = fopen(test_file_path, "w");
+    if (fingerprint_file_ptr == NULL) {
+        goto exit;
+    }
+
+    fprintf(fingerprint_file_ptr, "%s", fingerprint_file_content);
+    fflush(fingerprint_file_ptr);
+    fclose(fingerprint_file_ptr);
+
+    ret = osfp_score_db_load(db, (char *)test_file_path);
+    remove(test_file_path);
+    if (ret != 0) {
+        goto exit;
+    }
+
+    if (db->entry_count != 1) {
+        goto exit;
+    }
+
+    if (db->os_class_entry_count[OSFP_OS_CLASS_ANDROID] != 1) {
+        goto exit;
+    }
+
+    for (i = 0; i < OSFP_FIELD_MAX; i++) {
+        if (db->field_score_dbs[i].enabled != osfp_fingerprint_get_field_enabled(i)) {
+            goto exit;
+        }
+        if (db->field_score_dbs[i].enabled && db->field_score_dbs[i].type != osfp_fingerprint_get_field_type(i)) {
+            goto exit;
+        }
+        if (db->field_score_dbs[i].enabled && db->field_score_dbs[i].entry_count != 1) {
+            goto exit;
+        }
+    }
+
+    osfp_score_db_destroy(db);
+
+    return 0;
+exit:
+    return -1;
+}
+
+#endif
--- a/src/osfp_score_db.h
+++ b/src/osfp_score_db.h
@@ -0,0 +1,44 @@
+#ifndef __OSFP_SCORE_DB_H__
+#define __OSFP_SCORE_DB_H__
+
+#include "osfp.h"
+#include "osfp_fingerprint.h"
+
+struct osfp_os_class_score {
+    unsigned int scores[OSFP_OS_CLASS_MAX];
+};
+
+struct osfp_field_score_db {
+    unsigned int    enabled;
+    unsigned int    type;
+    unsigned int    entry_count;
+
+    void            *data;
+
+    void *(*create)(void);
+    void (*destroy)(void *);
+    int (*add)(void *data, struct osfp_os_class_score *, void *, unsigned int);
+    struct osfp_os_class_score *(*match)(void *, void *, unsigned int);
+};
+
+struct osfp_score_db {
+    unsigned int entry_count;
+    unsigned int perfect_score;
+    unsigned int os_class_entry_count[OSFP_OS_CLASS_MAX];
+    struct osfp_field_score_db field_score_dbs[OSFP_FIELD_MAX];
+};
+
+char *osfp_score_db_read_file(char *fp_file);
+void osfp_score_db_debug_print(struct osfp_score_db *score_db);
+
+int osfp_score_db_load(struct osfp_score_db *score_db, char *fp_file);
+int osfp_score_db_score(struct osfp_score_db *score_db, unsigned int flags, struct osfp_fingerprint *fp, struct osfp_os_class_score *result_score);
+
+struct osfp_score_db *osfp_score_db_create(void);
+void osfp_score_db_destroy(struct osfp_score_db *score_db);
+
+#ifdef UNITTEST
+int test_osfp_score_db(void);
+#endif
+
+#endif
--- a/test/Makefile.am
+++ b/test/Makefile.am
@@ -0,0 +1,11 @@
+bin_PROGRAMS = osfp_test
+
+osfp_test_SOURCES = \
+        test.c
+
+osfp_test_LDADD = \
+        ../src/.libs/libosfp.la
+
+osfp_test_CFLAGS = \
+        -I../src
+
--- a/test/README.md
+++ b/test/README.md
@@ -0,0 +1,11 @@
+# test
+```
+./.libs/osfp_test -f ../fp.json -t ../data.json
+```
+
+# output
+```
+total 12505, failed 0, pass 9582, wrong 2923, other 107, unknown 37
+miss rate: 24%
+details in: ./osfp_test.log
+```
--- a/test/osfp_test
+++ b/test/osfp_test
@@ -0,0 +1,228 @@
+#! /bin/sh
+
+# osfp_test - temporary wrapper script for .libs/osfp_test
+# Generated by libtool (GNU libtool) 2.4.2
+#
+# The osfp_test program cannot be directly executed until all the libtool
+# libraries that it depends on are installed.
+#
+# This wrapper script should never be moved out of the build directory.
+# If it is, it will not operate correctly.
+
+# Sed substitution that helps us do robust quoting.  It backslashifies
+# metacharacters that are still active within double-quoted strings.
+sed_quote_subst='s/\([`"$\\]\)/\\\1/g'
+
+# Be Bourne compatible
+if test -n "${ZSH_VERSION+set}" && (emulate sh) >/dev/null 2>&1; then
+  emulate sh
+  NULLCMD=:
+  # Zsh 3.x and 4.x performs word splitting on ${1+"$@"}, which
+  # is contrary to our usage.  Disable this feature.
+  alias -g '${1+"$@"}'='"$@"'
+  setopt NO_GLOB_SUBST
+else
+  case `(set -o) 2>/dev/null` in *posix*) set -o posix;; esac
+fi
+BIN_SH=xpg4; export BIN_SH # for Tru64
+DUALCASE=1; export DUALCASE # for MKS sh
+
+# The HP-UX ksh and POSIX shell print the target directory to stdout
+# if CDPATH is set.
+(unset CDPATH) >/dev/null 2>&1 && unset CDPATH
+
+relink_command="(cd /root/geedge/libosfp/test; { test -z \"\${LIBRARY_PATH+set}\" || unset LIBRARY_PATH || { LIBRARY_PATH=; export LIBRARY_PATH; }; }; { test -z \"\${COMPILER_PATH+set}\" || unset COMPILER_PATH || { COMPILER_PATH=; export COMPILER_PATH; }; }; { test -z \"\${GCC_EXEC_PREFIX+set}\" || unset GCC_EXEC_PREFIX || { GCC_EXEC_PREFIX=; export GCC_EXEC_PREFIX; }; }; { test -z \"\${LD_RUN_PATH+set}\" || unset LD_RUN_PATH || { LD_RUN_PATH=; export LD_RUN_PATH; }; }; { test -z \"\${LD_LIBRARY_PATH+set}\" || unset LD_LIBRARY_PATH || { LD_LIBRARY_PATH=; export LD_LIBRARY_PATH; }; }; PATH=/root/.cargo/bin:/usr/lib64/ccache:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/root/bin; export PATH; gcc -I../src -g -O2 -DUNITTEST -o \$progdir/\$file osfp_test-test.o  ../src/.libs/libosfp.so -Wl,-rpath -Wl,/root/geedge/libosfp/src/.libs -Wl,-rpath -Wl,/root/geedge/libosfp/target/lib)"
+
+# This environment variable determines our operation mode.
+if test "$libtool_install_magic" = "%%%MAGIC variable%%%"; then
+  # install mode needs the following variables:
+  generated_by_libtool_version='2.4.2'
+  notinst_deplibs=' ../src/.libs/libosfp.la'
+else
+  # When we are sourced in execute mode, $file and $ECHO are already set.
+  if test "$libtool_execute_magic" != "%%%MAGIC variable%%%"; then
+    file="$0"
+
+# A function that is used when there is no print builtin or printf.
+func_fallback_echo ()
+{
+  eval 'cat <<_LTECHO_EOF
+$1
+_LTECHO_EOF'
+}
+    ECHO="printf %s\\n"
+  fi
+
+# Very basic option parsing. These options are (a) specific to
+# the libtool wrapper, (b) are identical between the wrapper
+# /script/ and the wrapper /executable/ which is used only on
+# windows platforms, and (c) all begin with the string --lt-
+# (application programs are unlikely to have options which match
+# this pattern).
+#
+# There are only two supported options: --lt-debug and
+# --lt-dump-script. There is, deliberately, no --lt-help.
+#
+# The first argument to this parsing function should be the
+# script's ../libtool value, followed by no.
+lt_option_debug=
+func_parse_lt_options ()
+{
+  lt_script_arg0=$0
+  shift
+  for lt_opt
+  do
+    case "$lt_opt" in
+    --lt-debug) lt_option_debug=1 ;;
+    --lt-dump-script)
+        lt_dump_D=`$ECHO "X$lt_script_arg0" | /usr/bin/sed -e 's/^X//' -e 's%/[^/]*$%%'`
+        test "X$lt_dump_D" = "X$lt_script_arg0" && lt_dump_D=.
+        lt_dump_F=`$ECHO "X$lt_script_arg0" | /usr/bin/sed -e 's/^X//' -e 's%^.*/%%'`
+        cat "$lt_dump_D/$lt_dump_F"
+        exit 0
+      ;;
+    --lt-*)
+        $ECHO "Unrecognized --lt- option: '$lt_opt'" 1>&2
+        exit 1
+      ;;
+    esac
+  done
+
+  # Print the debug banner immediately:
+  if test -n "$lt_option_debug"; then
+    echo "osfp_test:osfp_test:${LINENO}: libtool wrapper (GNU libtool) 2.4.2" 1>&2
+  fi
+}
+
+# Used when --lt-debug. Prints its arguments to stdout
+# (redirection is the responsibility of the caller)
+func_lt_dump_args ()
+{
+  lt_dump_args_N=1;
+  for lt_arg
+  do
+    $ECHO "osfp_test:osfp_test:${LINENO}: newargv[$lt_dump_args_N]: $lt_arg"
+    lt_dump_args_N=`expr $lt_dump_args_N + 1`
+  done
+}
+
+# Core function for launching the target application
+func_exec_program_core ()
+{
+
+      if test -n "$lt_option_debug"; then
+        $ECHO "osfp_test:osfp_test:${LINENO}: newargv[0]: $progdir/$program" 1>&2
+        func_lt_dump_args ${1+"$@"} 1>&2
+      fi
+      exec "$progdir/$program" ${1+"$@"}
+
+      $ECHO "$0: cannot exec $program $*" 1>&2
+      exit 1
+}
+
+# A function to encapsulate launching the target application
+# Strips options in the --lt-* namespace from $@ and
+# launches target application with the remaining arguments.
+func_exec_program ()
+{
+  case " $* " in
+  *\ --lt-*)
+    for lt_wr_arg
+    do
+      case $lt_wr_arg in
+      --lt-*) ;;
+      *) set x "$@" "$lt_wr_arg"; shift;;
+      esac
+      shift
+    done ;;
+  esac
+  func_exec_program_core ${1+"$@"}
+}
+
+  # Parse options
+  func_parse_lt_options "$0" ${1+"$@"}
+
+  # Find the directory that this script lives in.
+  thisdir=`$ECHO "$file" | /usr/bin/sed 's%/[^/]*$%%'`
+  test "x$thisdir" = "x$file" && thisdir=.
+
+  # Follow symbolic links until we get to the real thisdir.
+  file=`ls -ld "$file" | /usr/bin/sed -n 's/.*-> //p'`
+  while test -n "$file"; do
+    destdir=`$ECHO "$file" | /usr/bin/sed 's%/[^/]*$%%'`
+
+    # If there was a directory component, then change thisdir.
+    if test "x$destdir" != "x$file"; then
+      case "$destdir" in
+      [\\/]* | [A-Za-z]:[\\/]*) thisdir="$destdir" ;;
+      *) thisdir="$thisdir/$destdir" ;;
+      esac
+    fi
+
+    file=`$ECHO "$file" | /usr/bin/sed 's%^.*/%%'`
+    file=`ls -ld "$thisdir/$file" | /usr/bin/sed -n 's/.*-> //p'`
+  done
+
+  # Usually 'no', except on cygwin/mingw when embedded into
+  # the cwrapper.
+  WRAPPER_SCRIPT_BELONGS_IN_OBJDIR=no
+  if test "$WRAPPER_SCRIPT_BELONGS_IN_OBJDIR" = "yes"; then
+    # special case for '.'
+    if test "$thisdir" = "."; then
+      thisdir=`pwd`
+    fi
+    # remove .libs from thisdir
+    case "$thisdir" in
+    *[\\/].libs ) thisdir=`$ECHO "$thisdir" | /usr/bin/sed 's%[\\/][^\\/]*$%%'` ;;
+    .libs )   thisdir=. ;;
+    esac
+  fi
+
+  # Try to get the absolute directory name.
+  absdir=`cd "$thisdir" && pwd`
+  test -n "$absdir" && thisdir="$absdir"
+
+  program=lt-'osfp_test'
+  progdir="$thisdir/.libs"
+
+  if test ! -f "$progdir/$program" ||
+     { file=`ls -1dt "$progdir/$program" "$progdir/../$program" 2>/dev/null | /usr/bin/sed 1q`; \
+       test "X$file" != "X$progdir/$program"; }; then
+
+    file="$$-$program"
+
+    if test ! -d "$progdir"; then
+      mkdir "$progdir"
+    else
+      rm -f "$progdir/$file"
+    fi
+
+    # relink executable if necessary
+    if test -n "$relink_command"; then
+      if relink_command_output=`eval $relink_command 2>&1`; then :
+      else
+	printf %s\n "$relink_command_output" >&2
+	rm -f "$progdir/$file"
+	exit 1
+      fi
+    fi
+
+    mv -f "$progdir/$file" "$progdir/$program" 2>/dev/null ||
+    { rm -f "$progdir/$program";
+      mv -f "$progdir/$file" "$progdir/$program"; }
+    rm -f "$progdir/$file"
+  fi
+
+  if test -f "$progdir/$program"; then
+    if test "$libtool_execute_magic" != "%%%MAGIC variable%%%"; then
+      # Run the actual program with our arguments.
+      func_exec_program ${1+"$@"}
+    fi
+  else
+    # The program doesn't exist.
+    $ECHO "$0: error: \`$progdir/$program' does not exist" 1>&2
+    $ECHO "This script is just a wrapper for $program." 1>&2
+    $ECHO "See the libtool documentation for more information." 1>&2
+    exit 1
+  fi
+fi
--- a/test/osfp_test.log
+++ b/test/osfp_test.log
--- a/test/test.c
+++ b/test/test.c
@@ -0,0 +1,199 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <time.h>
+
+#include "cJSON.h"
+
+#include "osfp.h"
+#include "osfp_fingerprint.h"
+#include "osfp_score_db.h"
+#include "osfp_log.h"
+#include "osfp_common.h"
+
+#define DATA_FILE_PATH "./data.json"
+#define DB_FILE_PATH "./db.json"
+#define TEST_FILE_PATH "./test.json"
+#define LOG_FILE_PATH "./osfp_test.log"
+
+unsigned char *data_file_path = DATA_FILE_PATH;
+unsigned char *db_file_path;
+unsigned char *test_file_path;
+
+FILE *data_file_ptr;
+FILE *db_file_ptr;
+FILE *test_file_ptr;
+FILE *log_file_ptr;
+
+unsigned int debug_enable;
+
+void test_data_prepare()
+{
+    char *file_buffer;
+
+    if (test_file_path == NULL) {
+        file_buffer = osfp_score_db_read_file(data_file_path);
+        if (file_buffer == NULL) {
+            osfp_log_error("read file: '%s'\n", data_file_path);
+            exit(1);
+        }
+
+        cJSON *data;
+        data = cJSON_Parse(file_buffer);
+        if (data == NULL) {
+            exit(1);
+        }
+
+        cJSON *test;
+        test = cJSON_CreateArray();
+
+        unsigned int data_count = cJSON_GetArraySize(data);
+        unsigned int db_count = data_count * 8 / 10;
+        unsigned int test_count = data_count - db_count;
+        srand(time(0));
+
+        int i;
+        for (i = 0; i < test_count; i++) {
+            cJSON_AddItemToArray(test, cJSON_DetachItemFromArray(data, rand() % data_count));
+            data_count--;
+        }
+
+        db_file_ptr = fopen(DB_FILE_PATH, "w");
+        test_file_ptr = fopen(TEST_FILE_PATH, "w");
+
+        fprintf(db_file_ptr, "%s", cJSON_Print(data));
+        fprintf(test_file_ptr, "%s", cJSON_Print(test));
+
+        fflush(db_file_ptr);
+        fflush(test_file_ptr);
+
+        db_file_path = DB_FILE_PATH;
+        test_file_path = TEST_FILE_PATH;
+    }else{
+        db_file_path = data_file_path;
+    }
+
+}
+
+void test_miss_rate()
+{
+    int i;
+    unsigned int other_count = 0;
+    unsigned int unknown_count = 0;
+    unsigned int identify_failed_count = 0;
+    unsigned int wrong_count = 0;
+    unsigned int verified_count = 0;
+    unsigned int fingerprint_count = 0;
+    char *file_buffer;
+
+    file_buffer = osfp_score_db_read_file(test_file_path);
+    if (file_buffer == NULL) {
+        osfp_log_error("read file: '%s'\n", test_file_path);
+        exit(1);
+    }
+
+    cJSON *root = cJSON_Parse(file_buffer);
+    if (root == NULL) {
+        exit(1);
+    }
+
+    fingerprint_count = cJSON_GetArraySize(root);
+
+    if (debug_enable) {
+        osfp_log_level_set(OSFP_LOG_LEVEL_DEBUG);
+    }
+
+    struct osfp_db *osfp_db = osfp_db_new(db_file_path);
+    if (osfp_db == NULL) {
+        printf("could not create osfp context. fingerprints file: %s\n", db_file_path);
+        exit(1);
+    }
+
+    //osfp_score_db_debug_print(osfp_db->score_db);
+
+    FILE *log_file_ptr = fopen(LOG_FILE_PATH, "w");
+
+    for (i = 0; i < fingerprint_count; i++) {
+        cJSON *entry = cJSON_GetArrayItem(root, i);
+        if (entry) {
+            cJSON *os_class_json = cJSON_GetObjectItem(entry, "os");
+            int os_class = osfp_os_class_name_to_id(os_class_json->valuestring);
+
+            const char *fp_str = cJSON_PrintUnformatted(entry);
+
+            struct osfp_result *result = osfp_json_identify(osfp_db, fp_str);
+            if (result == NULL) {
+                identify_failed_count++;
+                continue;
+            }
+
+            if (os_class == result->likely_os_class) {
+                verified_count++;
+                osfp_result_free(result);
+                continue;
+            }
+
+            wrong_count++;
+
+            if (result->likely_os_class == OSFP_OS_CLASS_OTHERS) {
+                other_count++;
+            }
+
+            if (result->likely_os_class == OSFP_OS_CLASS_UNKNOWN) {
+                unknown_count++;
+            }
+
+            fprintf(log_file_ptr, "expect: %s, result: %s\n", os_class_json->valuestring, osfp_result_os_name_get(result));
+
+            char *result_json = osfp_result_score_detail_export(result);
+            if (result_json) {
+                fprintf(log_file_ptr, "%s\n", result_json);
+            } else {
+                fprintf(log_file_ptr, "result detail error:%p\n", result);
+            }
+            fflush(log_file_ptr);
+            osfp_result_free(result);
+        }
+    }
+
+    printf("total %u, failed %u, pass %u, wrong %u, other %u, unknown %u\n",
+                fingerprint_count, identify_failed_count, verified_count, wrong_count, other_count, unknown_count);
+
+    printf("miss rate: %d%%\n", 100 - (verified_count * 100 / fingerprint_count));
+
+    printf("details in: %s\n", LOG_FILE_PATH);
+
+    osfp_db_free(osfp_db);
+}
+
+int main(int argc, char **argv)
+{
+    int r;
+
+    while ((r = getopt(argc, argv, "+f:t:o:d")) != -1) {
+        switch(r) {
+            case 'f':
+                data_file_path = (unsigned char*)optarg;
+                break;
+            case 't':
+                test_file_path = (unsigned char*)optarg;
+                break;
+            case 'd':
+                debug_enable = 1;
+                break;
+            default:
+                break;
+        }
+    }
+
+    assert(0 == test_osfp_fingerprinting_ipv4());
+    assert(0 == test_osfp_fingerprinting_ipv6());
+    assert(0 == test_osfp_fingerprinting_tcp_option());
+    assert(0 == test_osfp_score_db());
+
+    test_data_prepare();
+    test_miss_rate();
+
+    return 0;
+}
Author	SHA1	Message	Date
zhuzhenjun	64697d137e	v1.0.0	2023-10-09 17:27:01 +08:00
zhuzhenjun	56e3dec5f0	v0.0.5	2023-10-09 15:23:59 +08:00
zhuzhenjun	1a559eba99	v0.0.4	2023-09-27 19:40:42 +08:00
zhuzhenjun	15d4a2d271	v0.0.3	2023-09-27 11:45:58 +08:00
zhuzhenjun	eeb4cc0b6b	v0.0.2	2023-09-26 13:18:37 +08:00
zhuzhenjun	554867aa4e	v0.0.1	2023-09-22 18:44:27 +08:00