New file: it loads th mysql.user (user, passowrd) from the first backend database

dbusers.c

@@ -0,0 +1,114 @@
+/*
+ * This file is distributed as part of the SkySQL Gateway.  It is free
+ * software: you can redistribute it and/or modify it under the terms of the
+ * GNU General Public License as published by the Free Software Foundation,
+ * version 2.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 51
+ * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Copyright SkySQL Ab 2013
+ */
+
+/**
+ * @file dbusers.c  - Loading MySQL users from a MySQL backend server, this needs libmysqlclient.so and header files
+ *
+ * @verbatim
+ * Revision History
+ *
+ * Date		Who			Description
+ * 24/06/2013	Massimiliano Pinto	Initial implementation
+ *
+ * @endverbatim
+ */
+
+#include <stdio.h>
+#include <mysql.h>
+
+#include <dcb.h>
+#include <service.h>
+#include <users.h>
+
+/**
+ * Load the user/passwd form mysql.user table into the service users' hashtable
+ * environment.
+ *
+ * @param service   The current service
+ * @return      -1 on any error or the number of users inserted (0 means no users at all)
+ */
+int 
+load_mysql_users(SERVICE *service)
+{  
+	MYSQL *con = NULL;
+	MYSQL_ROW row;
+	MYSQL_RES *result = NULL;
+	int num_fields = 0;
+	int i = 0;
+	char *service_user = NULL;
+	char *service_passwd = NULL;
+	int total_users = 0;
+
+	serviceGetUser(service, &service_user, &service_passwd);
+
+	con = mysql_init(NULL);
+
+  if (con == NULL) 
+  {
+      fprintf(stderr, "%s\n", mysql_error(con));
+      return -1;
+  }
+
+  if (mysql_real_connect(con, service->databases->name, service_user, service_passwd, NULL, service->databases->port, NULL, 0) == NULL) 
+  {
+      fprintf(stderr, "%s\n", mysql_error(con));
+      mysql_close(con);
+      return -1;
+  }  
+
+fprintf(stderr, "HERE load_mysql_users, Yes connected to [%s]:[%i] as [%s]/[%s]\n", service->databases->name, service->databases->port, service_user, service_passwd);
+
+  if (mysql_query(con, "SELECT user, password FROM mysql.user")) {
+      fprintf(stderr, ">>>>> %s\n", mysql_error(con));
+      mysql_close(con);
+      return -1;
+  }
+
+  result = mysql_store_result(con);
+  
+  if (result == NULL) 
+  {
+      fprintf(stderr, "%s\n", mysql_error(con));
+      mysql_close(con);
+      return -1;
+  }
+
+  num_fields = mysql_num_fields(result);
+  
+  while ((row = mysql_fetch_row(result))) 
+  { 
+      for(i = 0; i < num_fields; i++) 
+      { 
+		//printf(" %s ", row[i]);
+      } 
+	//printf("User %s , Passwd %s\n", row[0], row[1]);
+	users_add(service->users, row[0], row[1]+1);
+	total_users++;
+  }
+
+  mysql_free_result(result);
+
+fprintf(stderr, "HERE loaded_mysql_users\n");
+
+  mysql_close(con);
+
+  return total_users;
+
+}
+
+