[agroal#392] Add application name and version in management protocol

In order to improve debugging, [agroal#392] suggested to write
the sender application name and its version in the
socket over which pgagroal-cli and pgagroal communicate.

Introduces the 'write_info' function in management.c.

AUTHORS

@@ -11,3 +11,4 @@ Yongting You <2010youy01@gmail.com>
 Ashutosh Sharma <ash2003sharma@gmail.com>
 Henrique de Carvalho <decarv.henrique@gmail.com>
 Yihe Lu <t1t4m1un@gmail.com>
+Eugenio Gigante <giganteeugenio2@gmail.com>

src/include/json.h

@@ -76,7 +76,7 @@
  * response object
  */
 cJSON*
-pgagroal_json_create_new_command_object(char* command_name, bool success, char* executable_name);
+pgagroal_json_create_new_command_object(char* command_name, bool success, char* executable_name, char* executable_version);
 
 /**
  * Utility method to "jump" to the output JSON object wrapped into

src/include/management.h

@@ -76,6 +76,25 @@ extern "C" {
 #define COMMAND_OUTPUT_FORMAT_TEXT 'T'
 #define COMMAND_OUTPUT_FORMAT_JSON 'J'
 
+/**
+ * Available applications
+ */
+#define PGAGROAL_EXECUTABLE 1
+#define PGAGROAL_EXECUTABLE_CLI 2
+#define PGAGROAL_EXECUTABLE_VAULT 3
+
+/*
+ * stores the application name and its version
+ * which are sent through the socket
+ */
+struct pgagroal_version_info
+{
+   char s[2];
+   int command;
+   char v[3];
+   int version;
+};
+
 /**
  * Get the frontend password of a user
  * @param ssl The SSL connection

src/libpgagroal/json.c

@@ -31,7 +31,7 @@
 #include <json.h>
 
 cJSON*
-pgagroal_json_create_new_command_object(char* command_name, bool success, char* executable_name)
+pgagroal_json_create_new_command_object(char* command_name, bool success, char* executable_name, char* executable_version)
 {
    // root of the JSON structure
    cJSON* json = cJSON_CreateObject();
@@ -71,10 +71,10 @@ pgagroal_json_create_new_command_object(char* command_name, bool success, char*
    }
 
    cJSON_AddStringToObject(application, JSON_TAG_APPLICATION_NAME, executable_name);
-   cJSON_AddNumberToObject(application, JSON_TAG_APPLICATION_VERSION_MAJOR, PGAGROAL_MAJOR_VERSION);
-   cJSON_AddNumberToObject(application, JSON_TAG_APPLICATION_VERSION_MINOR, PGAGROAL_MINOR_VERSION);
-   cJSON_AddNumberToObject(application, JSON_TAG_APPLICATION_VERSION_PATCH, PGAGROAL_PATCH_VERSION);
-   cJSON_AddStringToObject(application, JSON_TAG_APPLICATION_VERSION, PGAGROAL_VERSION);
+   cJSON_AddNumberToObject(application, JSON_TAG_APPLICATION_VERSION_MAJOR, executable_version[0] - '0');
+   cJSON_AddNumberToObject(application, JSON_TAG_APPLICATION_VERSION_MINOR, executable_version[2] - '0');
+   cJSON_AddNumberToObject(application, JSON_TAG_APPLICATION_VERSION_PATCH, executable_version[4] - '0');
+   cJSON_AddStringToObject(application, JSON_TAG_APPLICATION_VERSION, executable_version);
 
    // add objects to the whole json thing
    cJSON_AddItemToObject(json, "command", command);