Added support for remote files via plugin.

This will allow to read and import data from remote locations, e.g.
LOAD DATA LOCAL INFILE 'htp://www.example.com' or
mysql_options(mysql, MYSQL_READ_DEFAULT_FILE, "http://localhost/test.cnf");
The implementation uses libcurl. For a list of supported URL types
see http://curl.haxx.se/libcurl/

CMakeLists.txt

@@ -1,6 +1,5 @@
 # CMakeLists.txt
 
-
 # This is the LGPL libmariadb project.
 PROJECT(mariadb-connector-c C)
 

include/mariadb/ma_io.h

@@ -0,0 +1,33 @@
+#ifndef _ma_io_h_
+#define _ma_io_h_
+
+#include <curl/curl.h>
+
+enum enum_file_type {
+  MA_FILE_NONE=0,
+  MA_FILE_LOCAL=1,
+  MA_FILE_REMOTE=2
+};
+
+typedef struct 
+{
+  enum enum_file_type type;
+  void *ptr;
+} MA_FILE;
+
+struct st_rio_methods {
+  MA_FILE *(*open)(const char *url, const char *mode);
+  int (*close)(MA_FILE *ptr);
+  int (*feof)(MA_FILE *file);
+  size_t (*read)(void *ptr, size_t size, size_t nmemb, MA_FILE *file);
+  char * (*gets)(char *ptr, size_t size, MA_FILE *file);
+};
+
+/* function prototypes */
+MA_FILE *ma_open(const char *location, const char *mode, MYSQL *mysql);
+int ma_close(MA_FILE *file);
+int ma_feof(MA_FILE *file);
+size_t ma_read(void *ptr, size_t size, size_t nmemb, MA_FILE *file);
+char *ma_gets(char *ptr, size_t size, MA_FILE *file);
+
+#endif

include/mysql/client_plugin.h

@@ -39,11 +39,14 @@
 #define MYSQL_CLIENT_DB_PLUGIN               0
 #define MYSQL_CLIENT_reserved                1
 #define MYSQL_CLIENT_AUTHENTICATION_PLUGIN   2
+#define MYSQL_CLIENT_reserved22              3
+#define MYSQL_CLIENT_REMOTEIO_PLUGIN         4
 
 #define MYSQL_CLIENT_AUTHENTICATION_PLUGIN_INTERFACE_VERSION  0x0100
 #define MYSQL_CLIENT_DB_PLUGIN_INTERFACE_VERSION  0x0100
+#define MYSQL_CLIENT_REMOTEIO_PLUGIN_INTERFACE_VERSION 0x0100
 
-#define MYSQL_CLIENT_MAX_PLUGINS             3
+#define MYSQL_CLIENT_MAX_PLUGINS             5
 
 #define mysql_declare_client_plugin(X)          \
      struct st_mysql_client_plugin_ ## X        \
@@ -76,22 +79,6 @@ typedef struct st_mariadb_client_plugin_DB
   MYSQL_CLIENT_PLUGIN_HEADER
   /* functions */
   struct st_mysql_methods *methods;
-  /*
-  MYSQL * (*db_connect)(MYSQL *mysql,const char *host, const char *user,
-		                 const char *passwd, const char *db, uint port,
-                     const char *unix_socket,unsigned long client_flag);
-  void (*db_close)(MYSQL *mysql);
-  int (*db_query)(MYSQL *mysql, const char *query, size_t query_len);
-  int (*db_read_one_row)(MYSQL *mysql, uint fields, MYSQL_ROW row, 
-                         ulong *lengths);
-  MYSQL_DATA *(*db_read_all_rows)(MYSQL *mysql, 
-                                  MYSQL_FIELD *mysql_fields, uint fields);
-  void (*db_query_end)(MYSQL *mysql);
-  int (*db_stmt_prepare)(MYSQL_STMT *stmt, const char *stmt_str, ulong length);
-  my_bool (*db_stmt_close)(MYSQL_STMT *stmt);
-  my_bool (*is_supported_buffer_type)(enum enum_field_types type);
-  int (*db_stmt_fetch)(MYSQL_STMT *stmt);
-  int (*db_stmt_execute)(MYSQL_STMT *stmt); */
 } MARIADB_DB_PLUGIN;
 
 #define MARIADB_DB_DRIVER(a) ((a)->ext_db)
@@ -105,6 +92,7 @@ struct st_mysql_client_plugin_AUTHENTICATION
   int (*authenticate_user)(MYSQL_PLUGIN_VIO *vio, struct st_mysql *mysql);
 };
 
+
 /**
   type of the mysql_authentication_dialog_ask function
 
@@ -123,6 +111,17 @@ struct st_mysql_client_plugin_AUTHENTICATION
 */
 typedef char *(*mysql_authentication_dialog_ask_t)(struct st_mysql *mysql,
                       int type, const char *prompt, char *buf, int buf_len);
+
+/********************** remote IO plugin **********************/
+#include <mariadb/ma_io.h>
+
+/* Remote IO plugin */
+struct st_mysql_client_plugin_REMOTEIO
+{
+  MYSQL_CLIENT_PLUGIN_HEADER
+  struct st_rio_methods *methods;
+};
+
 /******** using plugins ************/
 
 /**

libmariadb/CMakeLists.txt

@@ -263,7 +263,8 @@ is_prefix.c
 libmariadb.c
 list.c
 llstr.c
-longlong2str.c 
+longlong2str.c
+ma_io.c
 mf_dirname.c 
 mf_fn_ext.c 
 mf_format.c

libmariadb/client_plugin.c

@@ -62,7 +62,25 @@ static uint plugin_version[MYSQL_CLIENT_MAX_PLUGINS]=
 {
   MYSQL_CLIENT_DB_PLUGIN_INTERFACE_VERSION, /* these two are taken by Connector/C */
   0, /* these two are taken by Connector/C */
-  MYSQL_CLIENT_AUTHENTICATION_PLUGIN_INTERFACE_VERSION
+  MYSQL_CLIENT_AUTHENTICATION_PLUGIN_INTERFACE_VERSION,
+  0,
+  MYSQL_CLIENT_REMOTEIO_PLUGIN_INTERFACE_VERSION
+};
+
+typedef struct st_mysql_client_plugin_AUTHENTICATION auth_plugin_t;
+extern auth_plugin_t old_password_client_plugin;
+extern auth_plugin_t native_password_client_plugin;
+
+/* built in plugins:
+   These plugins are part of Connector/C, so no need to
+   load them
+*/
+
+struct st_mysql_client_plugin *mysql_client_builtins[]=
+{
+  (struct st_mysql_client_plugin *)&old_password_client_plugin,
+  (struct st_mysql_client_plugin *)&native_password_client_plugin,
+  0
 };
 
 /*
@@ -85,7 +103,7 @@ static int is_not_initialized(MYSQL *mysql, const char *name)
 
   my_set_error(mysql, CR_AUTH_PLUGIN_CANNOT_LOAD,
                SQLSTATE_UNKNOWN, ER(CR_AUTH_PLUGIN_CANNOT_LOAD),
-               name, "not initialized");
+               name ? name : "unknown" , "not initialized");
   return 1;
 }
 
@@ -112,13 +130,14 @@ static struct st_mysql_client_plugin *find_plugin(const char *name, int type)
 
   for (p= plugin_list[type]; p; p= p->next)
   {
+    if (!name)
+      return p->plugin;
     if (strcmp(p->plugin->name, name) == 0)
       return p->plugin;
   }
   return NULL;
 }
 
-
 /**
   verifies the plugin and adds it to the list
 
@@ -266,6 +285,7 @@ int mysql_client_plugin_init()
 
   for (builtin= mysql_client_builtins; *builtin; builtin++)
     add_plugin(&mysql, *builtin, 0, 0, unused);
+
   pthread_mutex_unlock(&LOCK_load_client_plugin);
 
   load_env_plugins(&mysql);
@@ -456,7 +476,8 @@ mysql_client_find_plugin(MYSQL *mysql, const char *name, int type)
     return p;
 
   /* not found, load it */
-  return mysql_load_plugin(mysql, name, type, 0);
+  if (name)
+    return mysql_load_plugin(mysql, name, type, 0);
 }
 
 

libmariadb/default.c

@@ -41,6 +41,8 @@
 #include <ctype.h>
 #include "m_ctype.h"
 #include <my_dir.h>
+#include <mysql.h>
+#include <mariadb/ma_io.h>
 
 char *defaults_extra_file=0;
 
@@ -225,42 +227,49 @@ static my_bool search_default_file(DYNAMIC_ARRAY *args, MEM_ROOT *alloc,
 				   const char *ext, TYPELIB *group)
 {
   char name[FN_REFLEN+10],buff[4096],*ptr,*end,*value,*tmp;
-  FILE *fp;
+  MA_FILE *file;
   uint line=0;
   my_bool read_values= 0, found_group= 0, is_escaped= 0, is_quoted= 0;
 
-  if ((dir ? strlen(dir) : 0 )+strlen(config_file) >= FN_REFLEN-3)
+  if (!strstr(config_file, "://"))
-    return 0;					/* Ignore wrong paths */
-  if (dir)
   {
-    strmov(name,dir);
+    if ((dir ? strlen(dir) : 0 )+strlen(config_file) >= FN_REFLEN-3)
-    convert_dirname(name);
+      return 0;					/* Ignore wrong paths */
-    if (dir[0] == FN_HOMELIB)		/* Add . to filenames in home */
+    if (dir)
-      strcat(name,".");
-    strxmov(strend(name),config_file,ext,NullS);
-  }
-  else
-  {
-    strmov(name,config_file);
-  }
-  fn_format(name,name,"","",4);
-#if !defined(_WIN32) && !defined(OS2)
-  {
-    MY_STAT stat_info;
-    if (!my_stat(name,&stat_info,MYF(0)))
-      return 0;
-    if (stat_info.st_mode & S_IWOTH) /* ignore world-writeable files */
     {
-      fprintf(stderr, "warning: World-writeable config file %s is ignored\n",
+      strmov(name,dir);
-              name);
+      convert_dirname(name);
-      return 0;
+      if (dir[0] == FN_HOMELIB)		/* Add . to filenames in home */
+        strcat(name,".");
+      strxmov(strend(name),config_file,ext,NullS);
+    }
+    else
+    {
+      strmov(name,config_file);
+    }
+    fn_format(name,name,"","",4);
+#if !defined(_WIN32) && !defined(OS2)
+    {
+      MY_STAT stat_info;
+      if (!my_stat(name,&stat_info,MYF(0)))
+        return 0;
+      if (stat_info.st_mode & S_IWOTH) /* ignore world-writeable files */
+      {
+        fprintf(stderr, "warning: World-writeable config file %s is ignored\n",
+                name);
+        return 0;
+      }
     }
-  }
 #endif
-  if (!(fp = my_fopen(fn_format(name,name,"","",4),O_RDONLY,MYF(0))))
+    if (!(file = ma_open(fn_format(name,name,"","",4),"r", NULL)))
-    return 0;					/* Ignore wrong files */
+      return 0;
+  }
+  else {
+    if (!(file = ma_open(config_file, "r", NULL)))
+      return 0;
+  }
 
-  while (fgets(buff,sizeof(buff)-1,fp))
+  while (ma_gets(buff,sizeof(buff)-1,file))
   {
     line++;
     /* Ignore comment and empty lines */
@@ -372,11 +381,11 @@ static my_bool search_default_file(DYNAMIC_ARRAY *args, MEM_ROOT *alloc,
       *ptr=0;
     }
   }
-  my_fclose(fp,MYF(0));
+  ma_close(file);
   return(0);
 
  err:
-  my_fclose(fp,MYF(0));
+  ma_close(file);
   return 1;
 }
 

libmariadb/libmariadb.c

@@ -32,6 +32,7 @@
 #include "mysql.h"
 #include "mysql_version.h"
 #include "mysqld_error.h"
+#include <mariadb/ma_io.h>
 #include "errmsg.h"
 #include <sys/stat.h>
 #include <signal.h>

libmariadb/my_auth.c

@@ -21,7 +21,7 @@ do {\
   typedef char constraint[(A) ? 1 : -1];\
 } while (0);
 
-static auth_plugin_t native_password_client_plugin=
+auth_plugin_t native_password_client_plugin=
 {
   MYSQL_CLIENT_AUTHENTICATION_PLUGIN,
   MYSQL_CLIENT_AUTHENTICATION_PLUGIN_INTERFACE_VERSION,
@@ -34,7 +34,7 @@ static auth_plugin_t native_password_client_plugin=
   native_password_auth_client
 };
 
-static auth_plugin_t old_password_client_plugin=
+auth_plugin_t old_password_client_plugin=
 {
   MYSQL_CLIENT_AUTHENTICATION_PLUGIN,
   MYSQL_CLIENT_AUTHENTICATION_PLUGIN_INTERFACE_VERSION,
@@ -46,21 +46,6 @@ static auth_plugin_t old_password_client_plugin=
   NULL,
   old_password_auth_client
 };
-typedef struct st_mariadb_client_plugin_DBAPI dbapi_plugin_t;
-
-#ifdef HAVE_SQLITE
-extern dbapi_plugin_t sqlite3_plugin;
-#endif
-
-struct st_mysql_client_plugin *mysql_client_builtins[]=
-{
-  (struct st_mysql_client_plugin *)&old_password_client_plugin,
-  (struct st_mysql_client_plugin *)&native_password_client_plugin,
-#ifdef HAVE_SQLITE
-  (struct st_mysql_client_plugin *)&sqlite3_plugin,
-#endif
-  0
-};
 
 typedef struct {
   int (*read_packet)(struct st_plugin_vio *vio, uchar **buf);

libmariadb/my_loaddata.c

@@ -46,6 +46,7 @@
 #include <m_string.h>
 #include "errmsg.h"
 #include "mysql.h"
+#include <mariadb/ma_io.h>
 #include <string.h>
 #ifdef _WIN32
 #include <share.h>
@@ -53,7 +54,7 @@
 
 typedef struct st_mysql_infile_info
 {
-  int        fd;
+  MA_FILE   *fp;
   int        error_no;
   char       error_msg[MYSQL_ERRMSG_SIZE + 1];
   const char *filename;
@@ -64,71 +65,37 @@ static
 int mysql_local_infile_init(void **ptr, const char *filename, void *userdata)
 {
   MYSQL_INFILE_INFO *info;
-  int CodePage= -1;
-#ifdef _WIN32
   MYSQL *mysql= (MYSQL *)userdata;
-  wchar_t *w_filename= NULL;
-  int Length;
-#endif
   DBUG_ENTER("mysql_local_infile_init");
 
   info = (MYSQL_INFILE_INFO *)my_malloc(sizeof(MYSQL_INFILE_INFO), MYF(MY_ZEROFILL));
   if (!info) {
     DBUG_RETURN(1);
   }
-
   *ptr = info;
 
   info->filename = filename;
 
-#ifdef _WIN32
+  info->fp= ma_open(filename, "rb", mysql);
-  if (mysql)
-    CodePage= madb_get_windows_cp(mysql->charset->csname);
-#endif
-  if (CodePage == -1)
-  {
-#ifdef _WIN32
-    info->fd= sopen(info->filename, _O_RDONLY | _O_BINARY, _SH_DENYNO , _S_IREAD | _S_IWRITE);
-#else
-    info->fd = open(info->filename, O_RDONLY | O_BINARY, my_umask);
-#endif
-    my_errno= errno;
-  }
-#ifdef _WIN32
-  else
-  {
-    if ((Length= MultiByteToWideChar(CodePage, 0, info->filename, (int)strlen(info->filename), NULL, 0)))
-    {
-      if (!(w_filename= (wchar_t *)my_malloc((Length + 1) * sizeof(wchar_t), MYF(MY_ZEROFILL))))
-      {
-        info->error_no= CR_OUT_OF_MEMORY;
-        my_snprintf((char *)info->error_msg, sizeof(info->error_msg), 
-                     ER(CR_OUT_OF_MEMORY));
-        DBUG_RETURN(1);
-      }
-      Length= MultiByteToWideChar(CodePage, 0, info->filename, (int)strlen(info->filename), w_filename, (int)Length);
-    }
-    if (Length == 0)
-    {
-      my_free(w_filename);
-      info->error_no= CR_UNKNOWN_ERROR;
-      my_snprintf((char *)info->error_msg, sizeof(info->error_msg), 
-                  "Character conversion error: %d", GetLastError());
-      DBUG_RETURN(1);
-    }
-    info->fd= _wsopen(w_filename, _O_RDONLY | _O_BINARY, _SH_DENYNO , _S_IREAD | _S_IWRITE);
-    my_errno= errno;
-    my_free(w_filename);
-  }
-#endif
 
-  if (info->fd < 0)
+  if (!info->fp)
   {
-    info->error_no = my_errno;
+    /* error handling is done via mysql_local_infile_error function, so we
-    my_snprintf((char *)info->error_msg, sizeof(info->error_msg), 
+       need to copy error to info */
-                EE(EE_FILENOTFOUND), filename, info->error_no);
+    if (mysql_errno(mysql) && !info->error_no)
+    {
+      info->error_no= mysql_errno(mysql);
+      strncpy(info->error_msg, mysql_error(mysql), MYSQL_ERRMSG_SIZE);
+    }
+    else
+    {
+      info->error_no = my_errno;
+      my_snprintf((char *)info->error_msg, sizeof(info->error_msg), 
+                  EE(EE_FILENOTFOUND), filename, info->error_no);
+    }
     DBUG_RETURN(1);
   }
+
   DBUG_RETURN(0);
 }
 /* }}} */
@@ -139,11 +106,11 @@ static
 int mysql_local_infile_read(void *ptr, char * buf, unsigned int buf_len)
 {
   MYSQL_INFILE_INFO *info = (MYSQL_INFILE_INFO *)ptr;
-  int count;
+  size_t count;
 
   DBUG_ENTER("mysql_local_infile_read");
 
-  count= read(info->fd, (void *)buf, (size_t)buf_len);
+  count= ma_read((void *)buf, 1, (size_t)buf_len, info->fp);
 
   if (count < 0)
   {
@@ -184,8 +151,8 @@ void mysql_local_infile_end(void *ptr)
 
   if (info)
   {
-    if (info->fd >= 0)
+    if (info->fp)
-      close(info->fd);
+      ma_close(info->fp);
     my_free(ptr);
   }		
   DBUG_VOID_RETURN;

plugins/io/CMakeLists.txt

@@ -0,0 +1,19 @@
+INCLUDE_DIRECTORIES(${CMAKE_SOURCE_DIR}/include)
+
+FIND_PACKAGE(CURL)
+IF(CURL_FOUND)
+  ADD_DEFINITIONS(-DHAVE_CURL=1)
+  # remote file plugin
+  INCLUDE_DIRECTORIES(${CURL_INCLUDE_DIR})
+  SET(REMOTE_IO_SOURCES remote_io.c)
+  ADD_LIBRARY(remote_io SHARED ${REMOTE_IO_SOURCES} ${CMAKE_SOURCE_DIR}/plugins/plugin.def)
+  TARGET_LINK_LIBRARIES(remote_io ${CURL_LIBRARIES})
+
+  SET_TARGET_PROPERTIES(remote_io PROPERTIES PREFIX "")
+
+  INSTALL(TARGETS
+            remote_io
+            RUNTIME DESTINATION "${PLUGIN_INSTALL_DIR}"
+            LIBRARY DESTINATION "${PLUGIN_INSTALL_DIR}"
+            ARCHIVE DESTINATION "${PLUGIN_INSTALL_DIR}")
+ENDIF()

plugins/io/remote_io.c

@@ -0,0 +1,433 @@
+/************************************************************************************
+ * Copyright (C) 2015 Monty Program AB
+ * Copyright (c) 2003 Simtec Electronics
+ *
+ * Re-implemented by Vincent Sanders <vince@kyllikki.org> with extensive
+ * reference to original curl example code
+ *
+ * Rewritten for MariaDB Connector/C by Georg Richter <georg@mariadb.com>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *************************************************************************************/
+
+/*
+  This is a plugin for remote file access via libcurl.
+
+  The following URL types are supported:
+
+  http://
+  https://
+  ftp://
+  sftp://
+  ldap://
+  smb://
+*/
+
+#ifdef HAVE_CURL
+#include <my_global.h>
+#include <my_sys.h>
+#include <mysql.h>
+#include <mysql/client_plugin.h>
+#include <string.h>
+#include <memory.h>
+
+#include <stdio.h>
+#include <string.h>
+#ifndef WIN32
+#include <sys/time.h>
+#endif
+#include <stdlib.h>
+#include <errno.h>
+ 
+/* Internal file structure */
+
+MA_FILE *ma_rio_open(const char *url,const char *operation);
+int ma_rio_close(MA_FILE *file);
+int ma_rio_feof(MA_FILE *file);
+size_t ma_rio_read(void *ptr, size_t size, size_t nmemb, MA_FILE *file);
+char * ma_rio_gets(char *ptr, size_t size, MA_FILE *file);
+
+int ma_rio_init(char *, size_t, int, va_list);
+int ma_rio_deinit(void);
+
+struct st_rio_methods ma_rio_methods= {
+  ma_rio_open,
+  ma_rio_close,
+  ma_rio_feof,
+  ma_rio_read,
+  ma_rio_gets
+};
+
+typedef struct
+{
+  CURL *curl;
+  size_t length,
+         offset;
+  uchar *buffer;
+  int in_progress;
+} MA_REMOTE_FILE;
+ 
+CURLM *multi_handle= NULL;
+
+mysql_declare_client_plugin(REMOTEIO)
+  "remote_io",
+  "Georg Richter",
+  "Remote IO plugin",
+  {0,1,0},
+  ma_rio_init, 
+  ma_rio_deinit,
+  &ma_rio_methods
+mysql_end_client_plugin;
+
+/* {{{ ma_rio_init - Plugin initialization */
+int ma_rio_init(char *unused1, size_t unused2, int unused3, va_list unused4)
+{
+  curl_global_init(CURL_GLOBAL_ALL);
+  if (!multi_handle)
+    multi_handle = curl_multi_init();
+  return 0;
+}
+/* }}} */
+
+/* {{{ ma_rio_deinit - Plugin deinitialization */
+int ma_rio_deinit(void)
+{
+  if (multi_handle)
+  {
+    curl_multi_cleanup(multi_handle);
+    multi_handle= NULL;
+  }
+  curl_global_cleanup();
+}
+/* }}} */
+
+/* {{{ curl_write_callback */
+static size_t rio_write_callback(char *buffer,
+                                 size_t size,
+                                 size_t nitems,
+                                 void *ptr)
+{
+  size_t free_bytes;
+  char *tmp;
+
+  MA_FILE *file= (MA_FILE *)ptr; 
+  MA_REMOTE_FILE *curl_file = (MA_REMOTE_FILE *)file->ptr;
+  size *= nitems;
+ 
+  free_bytes= curl_file->length - curl_file->offset; 
+
+  /* check if we need to allocate more memory */ 
+  if (size > free_bytes) {
+    tmp= (char *)realloc((gptr)curl_file->buffer, curl_file->length + (size - free_bytes));
+    if (!tmp)
+      size= free_bytes;
+    else {
+      curl_file->length+= size - free_bytes;
+      curl_file->buffer= tmp;
+    }
+  }
+
+  /* copy buffer into MA_FILE structure */
+  memcpy((char *)curl_file->buffer + curl_file->offset, buffer, size);
+  curl_file->offset+= size;
+ 
+  return size;
+}
+/* }}} */
+ 
+/* use to attempt to fill the read buffer up to requested number of bytes */ 
+static int fill_buffer(MA_FILE *file, size_t want)
+{
+  fd_set fdread;
+  fd_set fdwrite;
+  fd_set fdexcep;
+  struct timeval timeout;
+  int rc;
+  CURLMcode mc; /* curl_multi_fdset() return code */
+  MA_REMOTE_FILE *rf= (MA_REMOTE_FILE *)file->ptr;
+ 
+  /* only attempt to fill buffer if transactions still running and buffer
+     doesnt exceed required size already */ 
+  if (!rf->in_progress || (rf->offset > want))
+    return 0;
+ 
+  /* try to fill buffer */ 
+  do {
+    int maxfd = -1;
+    long curl_timeo = -1;
+ 
+    FD_ZERO(&fdread);
+    FD_ZERO(&fdwrite);
+    FD_ZERO(&fdexcep);
+ 
+    /* set a suitable timeout to fail on */ 
+    timeout.tv_sec = 20; /* 20 seconds */ 
+    timeout.tv_usec = 0;
+ 
+    curl_multi_timeout(multi_handle, &curl_timeo);
+    if(curl_timeo >= 0) {
+      timeout.tv_sec = curl_timeo / 1000;
+      if(timeout.tv_sec > 1)
+        timeout.tv_sec = 1;
+      else
+        timeout.tv_usec = (curl_timeo % 1000) * 1000;
+    }
+ 
+    /* get file descriptors from the transfers */ 
+    mc = curl_multi_fdset(multi_handle, &fdread, &fdwrite, &fdexcep, &maxfd);
+ 
+    if(mc != CURLM_OK)
+    {
+      /* todo: error handling */
+      break;
+    }
+ 
+    /* On success the value of maxfd is guaranteed to be >= -1. We call
+       select(maxfd + 1, ...); specially in case of (maxfd == -1) there are
+       no fds ready yet so we call select(0, ...) */ 
+ 
+    if(maxfd == -1) {
+      struct timeval wait = { 0, 100 * 1000 }; /* 100ms */ 
+      rc = select(0, NULL, NULL, NULL, &wait);
+    }
+    else {
+      rc = select(maxfd+1, &fdread, &fdwrite, &fdexcep, &timeout);
+    }
+ 
+    switch(rc) {
+    case -1:
+      /* select error */ 
+      break;
+ 
+    case 0:
+    default:
+      /* timeout or readable/writable sockets */ 
+      curl_multi_perform(multi_handle, &rf->in_progress);
+      break;
+    }
+  } while(rf->in_progress && (rf->offset < want));
+  return 1;
+}
+ 
+/* use to remove want bytes from the front of a files buffer */ 
+static int use_buffer(MA_FILE *file,int want)
+{
+  MA_REMOTE_FILE *rf= (MA_REMOTE_FILE *)file->ptr;
+  /* sort out buffer */ 
+  if((rf->offset - want) <=0) {
+    /* ditch buffer - write will recreate */ 
+    if (rf->buffer)
+      free(rf->buffer);
+ 
+    rf->buffer=NULL;
+    rf->offset=0;
+    rf->length=0;
+  }
+  else {
+    /* move rest down make it available for later */ 
+    memmove(rf->buffer,
+            &rf->buffer[want],
+            (rf->offset - want));
+ 
+    rf->offset -= want;
+  }
+  return 0;
+}
+ 
+MA_FILE *ma_rio_open(const char *url,const char *operation)
+{
+  /* this code could check for URLs or types in the 'url' and
+     basicly use the real fopen() for standard files */ 
+ 
+  MA_FILE *file;
+  MA_REMOTE_FILE *rf;
+  (void)operation;
+ 
+  if (!(file = (MA_FILE *)calloc(sizeof(MA_FILE), 1)))
+    return NULL;
+ 
+  file->type= MA_FILE_REMOTE;
+  if (!(file->ptr= rf= (MA_REMOTE_FILE *)calloc(sizeof(MA_REMOTE_FILE), 1)))
+  {
+    free(file);
+    return NULL; 
+  }
+  rf->curl = curl_easy_init();
+
+  curl_easy_setopt(rf->curl, CURLOPT_URL, url);
+  curl_easy_setopt(rf->curl, CURLOPT_WRITEDATA, file);
+  curl_easy_setopt(rf->curl, CURLOPT_VERBOSE, 0L);
+  curl_easy_setopt(rf->curl, CURLOPT_WRITEFUNCTION, rio_write_callback);
+
+  curl_multi_add_handle(multi_handle, rf->curl);
+
+  /* lets start the fetch */ 
+  curl_multi_perform(multi_handle, &rf->in_progress);
+
+  if((rf->offset == 0) && (!rf->in_progress)) {
+    /* if in_progress is 0 now, we should return NULL */ 
+
+    /* make sure the easy handle is not in the multi handle anymore */ 
+    curl_multi_remove_handle(multi_handle, rf->curl);
+
+    /* cleanup */ 
+    curl_easy_cleanup(rf->curl);
+
+    free(file);
+
+    file = NULL;
+  }
+  return file;
+}
+ 
+int ma_rio_close(MA_FILE *file)
+{
+  int ret=0;/* default is good return */ 
+  MA_REMOTE_FILE *rf= (MA_REMOTE_FILE *)file->ptr;
+
+  switch(file->type) {
+    case MA_FILE_REMOTE:
+    curl_multi_remove_handle(multi_handle, rf->curl);
+ 
+    /* cleanup */
+    curl_easy_cleanup(rf->curl);
+    break;
+ 
+  default: /* unknown or supported type - oh dear */ 
+    ret=EOF;
+    errno=EBADF;
+    break;
+  }
+ 
+  if(rf->buffer)
+    free(rf->buffer);/* free any allocated buffer space */ 
+ 
+  free(rf);
+  free(file);
+ 
+  return ret;
+}
+ 
+int ma_rio_feof(MA_FILE *file)
+{
+  int ret=0;
+  MA_REMOTE_FILE *rf= (MA_REMOTE_FILE *)file->ptr;
+ 
+  switch(file->type) {
+  case MA_FILE_REMOTE:
+    if((rf->offset == 0) && (!rf->in_progress))
+      ret = 1;
+    break;
+ 
+  default: /* unknown or supported type - oh dear */ 
+    ret=-1;
+    errno=EBADF;
+    break;
+  }
+  return ret;
+}
+ 
+size_t ma_rio_read(void *ptr, size_t size, size_t nmemb, MA_FILE *file)
+{
+  size_t want;
+  MA_REMOTE_FILE *rf= (MA_REMOTE_FILE *)file->ptr;
+ 
+  switch(file->type) {
+  case MA_FILE_REMOTE:
+    want = nmemb * size;
+
+    fill_buffer(file,want);
+ 
+    /* check if theres data in the buffer - if not fill_buffer()
+     * either errored or EOF */ 
+    if(!rf->offset)
+      return 0;
+ 
+    /* ensure only available data is considered */ 
+    if(rf->offset < want)
+      want = rf->offset;
+ 
+    /* xfer data to caller */ 
+    memcpy(ptr, rf->buffer, want);
+ 
+    use_buffer(file,want);
+ 
+    want = want / size;     /* number of items */ 
+    break;
+ 
+  default: /* unknown or supported type - oh dear */ 
+    want=0;
+    errno=EBADF;
+    break;
+ 
+  }
+  return want;
+}
+ 
+char *ma_rio_gets(char *ptr, size_t size, MA_FILE *file)
+{
+  size_t want = size - 1;/* always need to leave room for zero termination */ 
+  size_t loop;
+ 
+  switch(file->type) {
+  case MA_FILE_REMOTE:
+  {
+    MA_REMOTE_FILE *rf= (MA_REMOTE_FILE *)file->ptr;
+    fill_buffer(file,want);
+ 
+    /* check if theres data in the buffer - if not fill either errored or
+     * EOF */ 
+    if(!rf->offset)
+      return NULL;
+ 
+    /* ensure only available data is considered */ 
+    if(rf->offset < want)
+      want = rf->offset;
+ 
+    /*buffer contains data */ 
+    /* look for newline or eof */ 
+    for(loop=0;loop < want;loop++) {
+      if(rf->buffer[loop] == '\n') {
+        want=loop+1;/* include newline */ 
+        break;
+      }
+    }
+ 
+    /* xfer data to caller */ 
+    memcpy(ptr, rf->buffer, want);
+    ptr[want]=0;/* allways null terminate */ 
+ 
+    use_buffer(file,want);
+ 
+    break;
+  }
+ 
+  default: /* unknown or supported type - oh dear */ 
+    ptr=NULL;
+    errno=EBADF;
+    break;
+  }
+ 
+  return ptr;/*success */ 
+}
+#endif 

unittest/libmariadb/misc.c

@@ -26,6 +26,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 
 #include <mysql/client_plugin.h>
 
+void *remote_plugin;
 
 /*
   Bug#28075 "COM_DEBUG crashes mysqld"
@@ -917,7 +918,7 @@ static int test_connect_attrs(MYSQL *my)
   rc= mysql_query(my, "SELECT * FROM performance_schema.session_connect_attrs LIMIT 1");
   if (rc != 0)
   {
-    diag("Server doesn't connection attributes");
+    diag("Server doesn't support connection attributes");
     return SKIP;
   }
 
@@ -1001,7 +1002,55 @@ static int test_conc117(MYSQL *mysql)
   return OK;
 }
 
+static int test_remote1(MYSQL *mysql)
+{
+  int rc;
+
+  remote_plugin= (void *)mysql_client_find_plugin(mysql, "remote_io", MYSQL_CLIENT_REMOTEIO_PLUGIN);
+  if (!remote_plugin)
+  {
+    diag("skip - no remote io plugin available");
+    return SKIP;
+  }
+
+  rc= mysql_query(mysql, "DROP TABLE IF EXISTS t1");
+  check_mysql_rc(rc, mysql);
+
+  rc= mysql_query(mysql, "CREATE TABLE t1 (a text)");
+  check_mysql_rc(rc, mysql);
+
+  rc= mysql_query(mysql, "LOAD DATA LOCAL INFILE 'http://www.example.com' INTO TABLE t1");
+  if (rc && mysql_errno(mysql) == 2058)
+  {
+    diag("remote_io plugin not available");
+    return SKIP;
+  }
+  check_mysql_rc(rc, mysql);
+  return OK;
+}
+
+static int test_remote2(MYSQL *my)
+{
+  MYSQL *mysql= mysql_init(NULL);
+
+  if (!remote_plugin)
+  {
+    diag("skip - no remote io plugin available");
+    return SKIP;
+  }
+
+  mysql_options(mysql, MYSQL_READ_DEFAULT_FILE, "http://localhost/test.cnf");
+  mysql_options(mysql, MYSQL_READ_DEFAULT_GROUP, "test");
+  mysql_real_connect(mysql, hostname, username, password, schema,
+                         0, socketname, 0), mysql_error(my);
+  diag("port: %d", mysql->port);
+  mysql_close(mysql);
+  return OK;
+}
+
 struct my_tests_st my_tests[] = {
+  {"test_remote1", test_remote1, TEST_CONNECTION_NEW, 0, NULL, NULL},
+  {"test_remote2", test_remote2, TEST_CONNECTION_NEW, 0, NULL, NULL},
   {"test_conc117", test_conc117, TEST_CONNECTION_DEFAULT, 0,  NULL, NULL},
   {"test_conc_114", test_conc_114, TEST_CONNECTION_DEFAULT, 0,  NULL, NULL},
   {"test_connect_attrs", test_connect_attrs, TEST_CONNECTION_DEFAULT, 0,  NULL, NULL},