v0.0.2

configure.ac

@@ -1,4 +1,4 @@
-AC_INIT([libosfp],[0.0.0],[zhuzhenjun@geedgenetworks.com])
+AC_INIT([libosfp],[0.0.2],[zhuzhenjun@geedgenetworks.com])
 AM_INIT_AUTOMAKE([foreign])
 
 #m4_ifndef([AM_SILENT_RULES], [m4_define([AM_SILENT_RULES],[])])AM_SILENT_RULES([yes])
@@ -7,7 +7,7 @@ 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="-ggdb3 -O0 -fsanitize=address -fno-omit-frame-pointer"],
       [CFLAGS="-g -O2"])
 
 

example/osfp_example.c

@@ -15,6 +15,7 @@
 #include <pcap.h>
 
 #include "libosfp.h"
+#include "libosfp_fingerprint.h"
 #include "libosfp_score_db.h"
 
 #define DEFAULT_FP_FILE_PATH "./fp.json"
@@ -483,7 +484,7 @@ void example_detect_fingerprint(libosfp_context_t *libosfp_context, Packet *p)
         goto exit;
     }
 
-    libosfp_fingerprint_to_json_buf(&fp, str_buf, sizeof(str_buf));
+    libosfp_fingerprint_to_json_buf(&fp, str_buf, sizeof(str_buf), 1);
     printf("%s\n", str_buf);
 
     // output fingerprint with connection info line

src/libosfp.c

@@ -132,4 +132,4 @@ void libosfp_context_destroy(libosfp_context_t *libosfp_context)
         }
         free(libosfp_context);
     }
-}
+}

src/libosfp_common.h

@@ -101,6 +101,27 @@
         }                                                               \
     } while (0)
 
+static inline unsigned long long libosfp_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 libosfp_profile_cycle(x) volatile unsigned long long x = 0
+#define libosfp_profile_get_cycle(x) do { \
+        x = libosfp_rdtsc(); \
+    } while(0)
+
 #define LIBOSFP_BIT_U32(n) (1UL << (n))
 
 typedef enum libosfp_error_code {

src/libosfp_fingerprint.c

@@ -124,7 +124,7 @@ static unsigned int decode_tcp_options(libosfp_tcp_opt_t *tcp_opts, unsigned int
     return tcp_opt_cnt;
 }
 
-int libosfp_fingerprint_to_json_buf(libosfp_fingerprint_t *fp, char *strbuf, unsigned int buf_len)
+int libosfp_fingerprint_to_json_buf(libosfp_fingerprint_t *fp, char *strbuf, unsigned int buf_len, unsigned int format)
 {
     int rlen = 0, ret, i;
     cJSON *root;
@@ -155,7 +155,7 @@ int libosfp_fingerprint_to_json_buf(libosfp_fingerprint_t *fp, char *strbuf, uns
         }
     }
 
-    if (!cJSON_PrintPreallocated(root, strbuf, buf_len, 1)) {
+    if (!cJSON_PrintPreallocated(root, strbuf, buf_len, format)) {
         return 0;
     }
 
@@ -308,7 +308,7 @@ int libosfp_fingerprinting_tcp(struct tcphdr *tcph, libosfp_fingerprint_t *fp)
 
     // tcp options
     if (tcp_off > LIBOSFP_TCP_HEADER_LEN) {
-        libosfp_fingerprinting_tcp_option((unsigned char *)tcph + LIBOSFP_TCP_HEADER_LEN, 20 + tcp_off - LIBOSFP_TCP_HEADER_LEN, fp);
+        libosfp_fingerprinting_tcp_option((unsigned char *)tcph + LIBOSFP_TCP_HEADER_LEN, tcp_off - LIBOSFP_TCP_HEADER_LEN, fp);
     }
 
     return 0;
@@ -398,3 +398,44 @@ int libosfp_fingerprinting(unsigned char *iph, unsigned char *tcph, libosfp_fing
 exit:
     return -1;
 }
+
+#ifdef UNITTEST
+int test_libosfp_fingerprinting(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_buf = "{\"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\":\"LIBOSFP_UNKNOWN\"}";
+    libosfp_fingerprint_t fp = {0};
+
+    ret = libosfp_fingerprinting(iph, tcph, &fp);
+    if (ret != 0) {
+        goto exit;
+    }
+
+    ret = libosfp_fingerprint_to_json_buf(&fp, str_buf, 2048, 0);
+    if (ret <= 0) {
+        goto exit;
+    }
+
+    if (0 != memcmp(str_buf, target_buf, strlen(target_buf))) {
+        goto exit;
+    }
+
+    return 0;
+exit:
+    return ret;
+}
+#endif

src/libosfp_fingerprint.h

@@ -40,7 +40,7 @@ typedef struct libosfp_fingerprint_field {
 typedef struct libosfp_fingerprint {
     libosfp_fingerprint_field_t fields[LIBOSFP_FIELD_MAX];
     char                        value_buffer[LIBOSFP_FINGERPRINT_VALUE_BUFFER_MAX];
-    unsigned                    value_buffer_used;
+    unsigned int                value_buffer_used;
 } libosfp_fingerprint_t;
 
 
@@ -48,7 +48,7 @@ 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_fingerprint_to_json_buf(libosfp_fingerprint_t *fp, char *strbuf, unsigned int buf_len, unsigned int format);
 void libosfp_fingerprint_setup_field(libosfp_fingerprint_t *fp, libosfp_field_id_t field_id, void *value, unsigned int len);
 
 void libosfp_fingerprinting_tcp_option(unsigned char *pkt, unsigned int pktlen, libosfp_fingerprint_t *fp);
@@ -57,4 +57,7 @@ int libosfp_fingerprinting_ipv4(struct iphdr *iph, libosfp_fingerprint_t *fp);
 int libosfp_fingerprinting_ipv6(struct ipv6hdr *iph, libosfp_fingerprint_t *fp);
 int libosfp_fingerprinting(unsigned char *iphdr, unsigned char *tcphdr, libosfp_fingerprint_t *fp);
 
+#ifdef UNITTEST
+int test_libosfp_fingerprinting(void);
+#endif
 #endif

src/libosfp_score_db.c

@@ -458,7 +458,7 @@ int libosfp_score_db_score(libosfp_score_db_t *score_db, unsigned int flags, lib
         entry_count = score_db->os_class_entry_count[i];
         os_class_score = result_score->os_class_score[i];
 
-        if (entry_count == 0 || perfect_score == 0) {
+        if (entry_count == 0) {
             continue;
         }
 
@@ -491,7 +491,7 @@ void libosfp_score_db_debug_print(libosfp_score_db_t *score_db)
 
     for (i = 0; i < LIBOSFP_OS_CLASS_MAX; i++) {
         const char *name = libosfp_os_class_id_to_name(i);
-        printf("os class %p ", name);
+        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", libosfp_os_class_id_to_name(i), score_db->os_class_entry_count[i]);