feature: add debug_plugin for development debugging

src/CMakeLists.txt

@@ -1,6 +1,7 @@
 add_subdirectory(log)
 add_subdirectory(times)
 add_subdirectory(tuple)
+add_subdirectory(hexdump)
 add_subdirectory(packet)
 add_subdirectory(packet_io)
 add_subdirectory(id_generator)

src/hexdump/CMakeLists.txt

@@ -0,0 +1,3 @@
+add_library(hexdump hexdump.cpp)
+target_include_directories(hexdump PUBLIC ${CMAKE_CURRENT_LIST_DIR})
+target_link_libraries(hexdump)

src/hexdump/hexdump.cpp

@@ -0,0 +1,37 @@
+#include "hexdump.h"
+
+void hexdump_to_fd(int fd, const char *data, uint16_t len)
+{
+    uint16_t i = 0;
+    uint16_t used = 0;
+    uint16_t offset = 0;
+
+#define LINE_LEN 80
+    char line[LINE_LEN]; /* space needed 8+16*3+3+16 == 75 */
+
+    dprintf(fd, "dump data at [%p], len=%u\n", data, len);
+    while (offset < len)
+    {
+        /* format the line in the buffer, then use printf to usedput to screen */
+        used = snprintf(line, LINE_LEN, "%08X:", offset);
+        for (i = 0; ((offset + i) < len) && (i < 16); i++)
+        {
+            used += snprintf(line + used, LINE_LEN - used, " %02X", (data[offset + i] & 0xff));
+        }
+        for (; i <= 16; i++)
+        {
+            used += snprintf(line + used, LINE_LEN - used, " | ");
+        }
+        for (i = 0; (offset < len) && (i < 16); i++, offset++)
+        {
+            unsigned char c = data[offset];
+            if ((c < ' ') || (c > '~'))
+            {
+                c = '.';
+            }
+            used += snprintf(line + used, LINE_LEN - used, "%c", c);
+        }
+        dprintf(fd, "%s\n", line);
+    }
+    dprintf(fd, "\n");
+}

src/hexdump/hexdump.h

@@ -0,0 +1,15 @@
+#pragma once
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+#include <stdint.h>
+#include <stdio.h>
+
+void hexdump_to_fd(int fd, const char *data, uint16_t len);
+
+#ifdef __cplusplus
+}
+#endif

src/packet/CMakeLists.txt

@@ -2,6 +2,6 @@ add_library(packet packet_parse.cpp packet_craft.cpp packet_dump.cpp packet_util
 target_include_directories(packet PUBLIC ${CMAKE_CURRENT_LIST_DIR})
 target_include_directories(packet PUBLIC ${CMAKE_SOURCE_DIR}/deps/uthash)
 target_include_directories(packet PUBLIC ${CMAKE_SOURCE_DIR}/include)
-target_link_libraries(packet tuple log)
+target_link_libraries(packet hexdump tuple log)
 
 add_subdirectory(test)

src/packet/packet_dump.cpp

@@ -5,6 +5,7 @@
 #include <sys/time.h>
 
 #include "log.h"
+#include "hexdump.h"
 #include "packet_dump.h"
 #include "packet_utils.h"
 
@@ -78,16 +79,8 @@ int packet_dump_pcap(const struct packet *pkt, const char *file)
 
 void packet_dump_hex(const struct packet *pkt, int fd)
 {
-    const char *data = packet_get_raw_data(pkt);
     uint16_t len = packet_get_raw_len(pkt);
+    const char *data = packet_get_raw_data(pkt);
 
-    for (int i = 0; i < len; i++)
-    {
-        if (i % 16 == 0)
-        {
-            dprintf(fd, "\n");
-        }
-        dprintf(fd, "%02x ", (unsigned char)data[i]);
-    }
-    dprintf(fd, "\n");
+    hexdump_to_fd(fd, data, len);
 }

src/packet/packet_parse.cpp

@@ -986,79 +986,87 @@ const char *packet_parse(struct packet *pkt, const char *data, uint16_t len)
     return parse_ether(pkt, data, len);
 }
 
-void packet_print(const struct packet *pkt)
+int packet_to_str(const struct packet *pkt, char *buff, int size)
 {
     if (pkt == NULL)
     {
-        return;
+        return 0;
     }
 
-    char buffer[2048] = {0};
-    printf("packet: %p, data_ptr: %p, data_len: %u, trim_len: %u, layers_used: %u, layers_size: %u\n",
+    int used = 0;
+    memset(buff, 0, size);
+    used += snprintf(buff + used, size - used, "packet: %p, data_ptr: %p, data_len: %u, trim_len: %u, layers_used: %u, layers_size: %u\n",
                      pkt, pkt->data_ptr, pkt->data_len, pkt->trim_len,
                      pkt->layers_used, pkt->layers_size);
     for (uint8_t i = 0; i < pkt->layers_used; i++)
     {
-        int used = 0;
         const struct raw_layer *layer = &pkt->layers[i];
-        printf("  layer[%u]: %p, proto: %s, header: {offset: %u, ptr: %p, len: %u}, payload: {ptr: %p, len: %u}\n",
+        used += snprintf(buff + used, size - used, "=> layer[%u]: %p, proto: %s, header: {offset: %u, ptr: %p, len: %u}, payload: {ptr: %p, len: %u}\n",
                          i, layer, layer_proto_to_str(layer->proto), layer->hdr_offset,
                          layer->hdr_ptr, layer->hdr_len, layer->pld_ptr, layer->pld_len);
         switch (layer->proto)
         {
         case LAYER_PROTO_ETHER:
-            used = eth_hdr_to_str((const struct ethhdr *)layer->hdr_ptr, buffer, sizeof(buffer));
+            used += eth_hdr_to_str((const struct ethhdr *)layer->hdr_ptr, buff + used, size - used);
+            used += snprintf(buff + used, size - used, "\n");
             break;
         case LAYER_PROTO_PWETH:
             break;
         case LAYER_PROTO_PPP:
             break;
         case LAYER_PROTO_L2TP:
-            used = l2tp_hdr_to_str((const struct l2tp_hdr *)layer->hdr_ptr, buffer, sizeof(buffer));
+            used += l2tp_hdr_to_str((const struct l2tp_hdr *)layer->hdr_ptr, buff + used, size - used);
+            used += snprintf(buff + used, size - used, "\n");
             break;
         case LAYER_PROTO_VLAN:
-            used = vlan_hdr_to_str((const struct vlan_hdr *)layer->hdr_ptr, buffer, sizeof(buffer));
+            used += vlan_hdr_to_str((const struct vlan_hdr *)layer->hdr_ptr, buff + used, size - used);
+            used += snprintf(buff + used, size - used, "\n");
             break;
         case LAYER_PROTO_PPPOE:
             break;
         case LAYER_PROTO_MPLS:
-            used = mpls_label_to_str((const struct mpls_label *)layer->hdr_ptr, buffer, sizeof(buffer));
-            break;
+            used += mpls_label_to_str((const struct mpls_label *)layer->hdr_ptr, buff + used, size - used);
+            used += snprintf(buff + used, size - used, "\n");
             break;
         case LAYER_PROTO_IPV4:
-            used = ip4_hdr_to_str((const struct ip *)layer->hdr_ptr, buffer, sizeof(buffer));
+            used += ip4_hdr_to_str((const struct ip *)layer->hdr_ptr, buff + used, size - used);
+            used += snprintf(buff + used, size - used, "\n");
             break;
         case LAYER_PROTO_IPV6:
-            used = ip6_hdr_to_str((const struct ip6_hdr *)layer->hdr_ptr, buffer, sizeof(buffer));
+            used += ip6_hdr_to_str((const struct ip6_hdr *)layer->hdr_ptr, buff + used, size - used);
+            used += snprintf(buff + used, size - used, "\n");
             break;
         case LAYER_PROTO_IPAH:
             break;
         case LAYER_PROTO_GRE:
-            used = gre_hdr_to_str(layer->hdr_ptr, layer->hdr_len, buffer, sizeof(buffer));
+            used += gre_hdr_to_str(layer->hdr_ptr, layer->hdr_len, buff + used, size - used);
+            used += snprintf(buff + used, size - used, "\n");
             break;
         case LAYER_PROTO_UDP:
-            used = udp_hdr_to_str((const struct udphdr *)layer->hdr_ptr, buffer, sizeof(buffer));
+            used += udp_hdr_to_str((const struct udphdr *)layer->hdr_ptr, buff + used, size - used);
+            used += snprintf(buff + used, size - used, "\n");
             break;
         case LAYER_PROTO_TCP:
-            used = tcp_hdr_to_str((const struct tcphdr *)layer->hdr_ptr, buffer, sizeof(buffer));
+            used += tcp_hdr_to_str((const struct tcphdr *)layer->hdr_ptr, buff + used, size - used);
+            used += snprintf(buff + used, size - used, "\n");
             break;
         case LAYER_PROTO_ICMP:
             break;
         case LAYER_PROTO_ICMP6:
             break;
         case LAYER_PROTO_VXLAN:
-            used = vxlan_hdr_to_str((const struct vxlan_hdr *)layer->hdr_ptr, buffer, sizeof(buffer));
+            used += vxlan_hdr_to_str((const struct vxlan_hdr *)layer->hdr_ptr, buff + used, size - used);
+            used += snprintf(buff + used, size - used, "\n");
             break;
         case LAYER_PROTO_GTP_C:
         case LAYER_PROTO_GTP_U:
-            used = gtp_hdr_to_str(layer->hdr_ptr, layer->hdr_len, buffer, sizeof(buffer));
+            used += gtp_hdr_to_str(layer->hdr_ptr, layer->hdr_len, buff + used, size - used);
+            used += snprintf(buff + used, size - used, "\n");
             break;
         default:
             break;
         }
-        if (used)
-        {
-            printf("    %s\n", buffer);
-        }
     }
+
+    return used;
 }

src/packet/packet_parse.h

@@ -6,9 +6,20 @@ extern "C"
 #endif
 
 #include <stdint.h>
+#include <stdio.h>
 
 const char *packet_parse(struct packet *pkt, const char *data, uint16_t len);
-void packet_print(const struct packet *pkt);
+
+// bref : 1, output packet bref info
+// bref : 0, output packet detail info
+int packet_to_str(const struct packet *pkt, char *buff, int size);
+
+static inline void packet_print(const struct packet *pkt)
+{
+    char buff[4096];
+    packet_to_str(pkt, buff, sizeof(buff));
+    printf("%s\n", buff);
+}
 
 #ifdef __cplusplus
 }

src/packet/test/gtest_packet_craft.cpp

@@ -12,6 +12,7 @@
 #include "packet_layer.h"
 #include "packet_parse.h"
 #include "packet_craft.h"
+#include "packet_utils.h"
 
 #define PRINT_GREEN(fmt, ...) printf("\033[0;32m" fmt "\033[0m\n", ##__VA_ARGS__)
 #define PRINT_RED(fmt, ...) printf("\033[0;31m" fmt "\033[0m\n", ##__VA_ARGS__)
@@ -191,6 +192,8 @@ TEST(PACKET_CRAFT_TCP, ETH_IP4_TCP)
 		// printf(("idx: %d, orig: %02x, new: %02x\n"), i, orig_pkt_data[i], new_pkt_data[i]);
 		EXPECT_TRUE(orig_pkt_data[i] == new_pkt_data[i]);
 	}
+
+	packet_free(new_pkt);
 }
 #endif
 
@@ -336,6 +339,8 @@ TEST(PACKET_CRAFT_TCP, ETH_IP4_IP6_TCP)
 		// printf(("idx: %d, orig: %02x, new: %02x\n"), i, orig_pkt_data[i], new_pkt_data[i]);
 		EXPECT_TRUE(orig_pkt_data[i] == new_pkt_data[i]);
 	}
+
+	packet_free(new_pkt);
 }
 #endif
 
@@ -574,6 +579,8 @@ TEST(PACKET_CRAFT_TCP, ETH_IP6_UDP_GTP_IP4_TCP)
 		// printf(("idx: %d, orig: %02x, new: %02x\n"), i, orig_pkt_data[i], new_pkt_data[i]);
 		EXPECT_TRUE(orig_pkt_data[i] == new_pkt_data[i]);
 	}
+
+	packet_free(new_pkt);
 }
 #endif
 
@@ -780,6 +787,8 @@ TEST(PACKET_CRAFT_TCP, ETH_IP4_GRE_IP6_TCP)
 		// printf(("idx: %d, orig: %02x, new: %02x\n"), i, orig_pkt_data[i], new_pkt_data[i]);
 		EXPECT_TRUE(orig_pkt_data[i] == new_pkt_data[i]);
 	}
+
+	packet_free(new_pkt);
 }
 #endif
 
@@ -1011,6 +1020,8 @@ TEST(PACKET_CRAFT_UDP, ETH_VLAN_IPv6_IPv4_GRE_PPP_IPv4_UDP_DNS)
 		printf(("idx: %d, orig: %02x, new: %02x\n"), i, orig_pkt_data[i], new_pkt_data[i]);
 		EXPECT_TRUE(orig_pkt_data[i] == new_pkt_data[i]);
 	}
+
+	packet_free(new_pkt);
 }
 #endif
 

src/session/session_utils.cpp

@@ -494,12 +494,25 @@ static void tcp_flags_to_str(uint8_t flags, char *buffer, size_t len)
     }
 }
 
-int session_to_json(struct session *sess, char *buff, int size)
+int session_to_str(const struct session *sess, int bref, char *buff, int size)
 {
     memset(buff, 0, size);
     char flags[64] = {0};
     int used = 0;
 
+    if (bref)
+    {
+        used += snprintf(buff + used, size - used, "session id: %lu, addr: %s, type: %s, state: %s, dir: %s, c2s_rx_pkts: %lu, s2c_rx_pkts: %lu",
+                         session_get_id(sess),
+                         session_get0_readable_addr(sess),
+                         session_type_to_str(session_get_type(sess)),
+                         session_state_to_str(session_get_current_state(sess)),
+                         flow_direction_to_str(session_get_current_flow_direction(sess)),
+                         session_get_stat(sess, FLOW_DIRECTION_C2S, STAT_RAW_PACKETS_RECEIVED),
+                         session_get_stat(sess, FLOW_DIRECTION_S2C, STAT_RAW_PACKETS_RECEIVED));
+    }
+    else
+    {
         used += snprintf(buff + used, size - used, "{");
         used += snprintf(buff + used, size - used, "\"id\":%" PRIu64 ",", session_get_id(sess));
         used += snprintf(buff + used, size - used, "\"start_timestamp\":%" PRIu64 ",", session_get_timestamp(sess, SESSION_TIMESTAMP_START));
@@ -587,13 +600,7 @@ int session_to_json(struct session *sess, char *buff, int size)
             }
         }
         used += snprintf(buff + used, size - used, "}");
+    }
 
     return used;
 }
-
-void session_print(struct session *sess)
-{
-    char buff[4096];
-    session_to_json(sess, buff, sizeof(buff));
-    printf("%s\n", buff);
-}

src/session/session_utils.h

@@ -6,6 +6,7 @@ extern "C"
 #endif
 
 #include <stdint.h>
+#include <stdio.h>
 
 #include "stellar/session.h"
 
@@ -131,8 +132,16 @@ const char *session_state_to_str(enum session_state state);
 const char *session_type_to_str(enum session_type type);
 const char *flow_direction_to_str(enum flow_direction dir);
 
-int session_to_json(struct session *sess, char *buff, int size);
-void session_print(struct session *sess);
+// bref : 1, output session bref info
+// bref : 0, output session detail info
+int session_to_str(const struct session *sess, int bref, char *buff, int size);
+
+static inline void session_print(const struct session *sess)
+{
+    char buff[4096];
+    session_to_str(sess, 0, buff, sizeof(buff));
+    printf("%s\n", buff);
+}
 
 #ifdef __cplusplus
 }

test/CMakeLists.txt

@@ -1,2 +1,3 @@
 add_subdirectory(packet_inject)
 add_subdirectory(packet_tool)
+add_subdirectory(debug_plugin)

test/debug_plugin/CMakeLists.txt

@@ -0,0 +1,8 @@
+# build libdebug_plugin.so
+add_library(debug_plugin SHARED debug_plugin.cpp)
+# Note: The debug plugin here uses stellar_core instead of stellar_devel, in order to output more session/packet information for development debugging.
+target_link_libraries(debug_plugin stellar_core toml)
+target_include_directories(debug_plugin PUBLIC ${CMAKE_SOURCE_DIR}/include/)
+set_target_properties(debug_plugin PROPERTIES LINK_FLAGS "-Wl,--version-script=${CMAKE_CURRENT_LIST_DIR}/version.map")
+
+file(COPY ./conf/ DESTINATION ./conf/)

test/debug_plugin/conf/spec.toml

@@ -0,0 +1,4 @@
+[[plugin]]
+path = "./plugin/libdebug_plugin.so"
+init = "debug_plugin_init"
+exit = "debug_plugin_exit"

test/debug_plugin/debug_plugin.cpp

@@ -0,0 +1,196 @@
+#include <stdio.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <stdarg.h>
+#include <time.h>
+#include <pthread.h>
+#include <arpa/inet.h>
+
+#include "log.h"
+#include "hexdump.h"
+#include "session_utils.h"
+#include "tcp_reassembly.h"
+#include "packet_dump.h"
+#include "packet_parse.h"
+#include "packet_utils.h"
+#include "stellar/session_mq.h"
+
+// NOTE: packet hexdump or tcp segment hexdump may be too long, so we need direct output to fd, instead of using log_print
+static void log_print(int fd, const char *module, const char *fmt, ...)
+{
+    static unsigned char weekday_str[7][4] = {"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"};
+    static unsigned char month_str[12][4] = {"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
+
+    int nwrite;
+    char buf[4096 * 2] = {0};
+    char *p = buf;
+    char *end = buf + sizeof(buf);
+    va_list args;
+    struct tm local;
+
+    time_t t;
+    time(&t);
+    localtime_r(&t, &local);
+
+    // add time
+    p += snprintf(p, end - p, "%s %s %d %02d:%02d:%02d %d ",
+                  weekday_str[local.tm_wday], month_str[local.tm_mon], local.tm_mday, local.tm_hour, local.tm_min, local.tm_sec, local.tm_year + 1900);
+    // add tid
+    p += snprintf(p, end - p, "%lu ", pthread_self());
+    // add module
+    p += snprintf(p, end - p, "(%s), ", module);
+    // add content
+    va_start(args, fmt);
+    p += vsnprintf(p, end - p, fmt, args);
+    va_end(args);
+    // add end of line
+    p += snprintf(p, end - p, "\n");
+
+    do
+    {
+        nwrite = write(fd, buf, p - buf);
+    } while (nwrite == -1 && errno == EINTR);
+}
+
+struct plugin_ctx
+{
+    struct stellar *st;
+    int sess_plug_id;
+    int tcp_topic_id;
+    int udp_topic_id;
+    int tcp_stream_topic_id;
+    int fd;
+    pthread_spinlock_t lock; // for hexdump thread safe
+};
+
+static void *on_sess_new(struct session *sess, void *plugin_ctx)
+{
+    char buff[4096];
+    struct plugin_ctx *ctx = (struct plugin_ctx *)plugin_ctx;
+
+    memset(buff, 0, sizeof(buff));
+    session_to_str(sess, 1, buff, sizeof(buff) - 1);
+    log_print(ctx->fd, "debug plugin", "sess new: %s", buff);
+
+    return NULL;
+}
+
+static void on_sess_free(struct session *sess, void *sess_ctx, void *plugin_ctx)
+{
+    char buff[4096];
+    struct plugin_ctx *ctx = (struct plugin_ctx *)plugin_ctx;
+
+    memset(buff, 0, sizeof(buff));
+    session_to_str(sess, 0, buff, sizeof(buff) - 1);
+    log_print(ctx->fd, "debug plugin", "sess free: %s", buff);
+}
+
+static void on_sess_udp_msg(struct session *sess, int topic_id, const void *msg, void *sess_ctx, void *plugin_ctx)
+{
+    char buff[4096];
+    struct packet *pkt = (struct packet *)msg;
+    struct plugin_ctx *ctx = (struct plugin_ctx *)plugin_ctx;
+
+    memset(buff, 0, sizeof(buff));
+    session_to_str(sess, 1, buff, sizeof(buff) - 1);
+    log_print(ctx->fd, "debug plugin", "on UDP msg: %s", buff);
+
+    memset(buff, 0, sizeof(buff));
+    packet_to_str(pkt, buff, sizeof(buff) - 1);
+    log_print(ctx->fd, "debug plugin", "rx UDP packet: \n%s", buff);
+
+    pthread_spin_lock(&ctx->lock);
+    packet_dump_hex(pkt, ctx->fd);
+    pthread_spin_unlock(&ctx->lock);
+}
+
+static void on_sess_tcp_msg(struct session *sess, int topic_id, const void *msg, void *sess_ctx, void *plugin_ctx)
+{
+    char buff[4096];
+    struct packet *pkt = (struct packet *)msg;
+    struct plugin_ctx *ctx = (struct plugin_ctx *)plugin_ctx;
+
+    memset(buff, 0, sizeof(buff));
+    session_to_str(sess, 1, buff, sizeof(buff) - 1);
+    log_print(ctx->fd, "debug plugin", "on TCP msg: %s", buff);
+
+    memset(buff, 0, sizeof(buff));
+    packet_to_str(pkt, buff, sizeof(buff) - 1);
+    log_print(ctx->fd, "debug plugin", "rx TCP packet: \n%s", buff);
+
+    pthread_spin_lock(&ctx->lock);
+    packet_dump_hex(pkt, ctx->fd);
+    pthread_spin_unlock(&ctx->lock);
+}
+
+static void on_sess_tcp_stream_msg(struct session *sess, int topic_id, const void *msg, void *sess_ctx, void *plugin_ctx)
+{
+    char buff[4096];
+    struct tcp_segment *seg = (struct tcp_segment *)msg;
+    struct plugin_ctx *ctx = (struct plugin_ctx *)plugin_ctx;
+
+    memset(buff, 0, sizeof(buff));
+    session_to_str(sess, 1, buff, sizeof(buff) - 1);
+    log_print(ctx->fd, "debug plugin", "on TCP stream msg: %s", buff);
+
+    log_print(ctx->fd, "debug plugin", "rx TCP segment: len: %d, data: %p\n", seg->len, seg->data);
+
+    pthread_spin_lock(&ctx->lock);
+    hexdump_to_fd(ctx->fd, (const char *)seg->data, seg->len);
+    pthread_spin_unlock(&ctx->lock);
+}
+
+/******************************************************************************
+ * Plugin API
+ ******************************************************************************/
+
+extern "C"
+{
+    void *debug_plugin_init(struct stellar *st)
+    {
+        struct plugin_ctx *ctx = (struct plugin_ctx *)calloc(1, sizeof(struct plugin_ctx));
+        if (ctx == NULL)
+        {
+            return NULL;
+        }
+
+        ctx->fd = open("./log/debug_plugin.log", O_WRONLY | O_APPEND | O_CREAT, 0644);
+        if (ctx->fd == -1)
+        {
+            ctx->fd = STDOUT_FILENO;
+        }
+        pthread_spin_init(&ctx->lock, PTHREAD_PROCESS_PRIVATE);
+
+        ctx->st = st;
+        ctx->sess_plug_id = stellar_session_plugin_register(st, on_sess_new, on_sess_free, ctx);
+        ctx->udp_topic_id = stellar_session_mq_get_topic_id(st, TOPIC_UDP);
+        ctx->tcp_topic_id = stellar_session_mq_get_topic_id(st, TOPIC_TCP);
+        ctx->tcp_stream_topic_id = stellar_session_mq_get_topic_id(st, TOPIC_TCP_STREAM);
+
+        stellar_session_mq_subscribe(st, ctx->udp_topic_id, on_sess_udp_msg, ctx->sess_plug_id);
+        stellar_session_mq_subscribe(st, ctx->tcp_topic_id, on_sess_tcp_msg, ctx->sess_plug_id);
+        stellar_session_mq_subscribe(st, ctx->tcp_stream_topic_id, on_sess_tcp_stream_msg, ctx->sess_plug_id);
+
+        log_print(ctx->fd, "debug plugin", "init");
+
+        return ctx;
+    }
+
+    void debug_plugin_exit(void *plugin_ctx)
+    {
+        struct plugin_ctx *ctx = (struct plugin_ctx *)plugin_ctx;
+        if (ctx)
+        {
+            log_print(ctx->fd, "debug plugin", "exit");
+            if (ctx->fd > 0)
+            {
+                close(ctx->fd);
+            }
+            pthread_spin_destroy(&ctx->lock);
+            free(ctx);
+        }
+    }
+}

test/debug_plugin/version.map

@@ -0,0 +1,7 @@
+DEBUG_PLUGIN {
+global:
+	debug_plugin_init;
+	debug_plugin_exit;
+
+local: *;
+};