thd_rnd service

include/mysql/plugin_audit.h.pp

@@ -219,6 +219,12 @@ extern struct thd_autoinc_service_st {
 } *thd_autoinc_service;
 void thd_get_autoinc(const void* thd,
                      unsigned long* off, unsigned long* inc);
+extern struct thd_rnd_service_st {
+  double (*thd_rnd_ptr)(void* thd);
+  void (*thd_c_r_p_ptr)(void* thd, char *to, size_t length);
+} *thd_rnd_service;
+double thd_rnd(void* thd);
+void thd_create_random_password(void* thd, char *to, size_t length);
 extern struct thd_error_context_service_st {
   const char *(*thd_get_error_message_func)(const void* thd);
   unsigned int (*thd_get_error_number_func)(const void* thd);

include/mysql/plugin_auth.h.pp

@@ -219,6 +219,12 @@ extern struct thd_autoinc_service_st {
 } *thd_autoinc_service;
 void thd_get_autoinc(const void* thd,
                      unsigned long* off, unsigned long* inc);
+extern struct thd_rnd_service_st {
+  double (*thd_rnd_ptr)(void* thd);
+  void (*thd_c_r_p_ptr)(void* thd, char *to, size_t length);
+} *thd_rnd_service;
+double thd_rnd(void* thd);
+void thd_create_random_password(void* thd, char *to, size_t length);
 extern struct thd_error_context_service_st {
   const char *(*thd_get_error_message_func)(const void* thd);
   unsigned int (*thd_get_error_number_func)(const void* thd);

include/mysql/plugin_encryption.h.pp

@@ -219,6 +219,12 @@ extern struct thd_autoinc_service_st {
 } *thd_autoinc_service;
 void thd_get_autoinc(const void* thd,
                      unsigned long* off, unsigned long* inc);
+extern struct thd_rnd_service_st {
+  double (*thd_rnd_ptr)(void* thd);
+  void (*thd_c_r_p_ptr)(void* thd, char *to, size_t length);
+} *thd_rnd_service;
+double thd_rnd(void* thd);
+void thd_create_random_password(void* thd, char *to, size_t length);
 extern struct thd_error_context_service_st {
   const char *(*thd_get_error_message_func)(const void* thd);
   unsigned int (*thd_get_error_number_func)(const void* thd);

include/mysql/plugin_ftparser.h.pp

@@ -219,6 +219,12 @@ extern struct thd_autoinc_service_st {
 } *thd_autoinc_service;
 void thd_get_autoinc(const void* thd,
                      unsigned long* off, unsigned long* inc);
+extern struct thd_rnd_service_st {
+  double (*thd_rnd_ptr)(void* thd);
+  void (*thd_c_r_p_ptr)(void* thd, char *to, size_t length);
+} *thd_rnd_service;
+double thd_rnd(void* thd);
+void thd_create_random_password(void* thd, char *to, size_t length);
 extern struct thd_error_context_service_st {
   const char *(*thd_get_error_message_func)(const void* thd);
   unsigned int (*thd_get_error_number_func)(const void* thd);

include/mysql/plugin_password_validation.h.pp

@@ -219,6 +219,12 @@ extern struct thd_autoinc_service_st {
 } *thd_autoinc_service;
 void thd_get_autoinc(const void* thd,
                      unsigned long* off, unsigned long* inc);
+extern struct thd_rnd_service_st {
+  double (*thd_rnd_ptr)(void* thd);
+  void (*thd_c_r_p_ptr)(void* thd, char *to, size_t length);
+} *thd_rnd_service;
+double thd_rnd(void* thd);
+void thd_create_random_password(void* thd, char *to, size_t length);
 extern struct thd_error_context_service_st {
   const char *(*thd_get_error_message_func)(const void* thd);
   unsigned int (*thd_get_error_number_func)(const void* thd);

include/mysql/service_thd_rnd.h

@@ -0,0 +1,62 @@
+#ifndef MYSQL_SERVICE_THD_RND_INCLUDED
+/* Copyright (C) 2017 MariaDB Corporation
+
+   This program 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 of the License.
+
+   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 St, Fifth Floor, Boston, MA 02110-1301  USA */
+
+/**
+  @file
+  This service provides access to the thd-local random number generator.
+
+  It's preferrable over the global one, because concurrent threads
+  can generate random numbers without fighting each other over the access
+  to the shared rnd state.
+*/
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifndef MYSQL_ABI_CHECK
+#include <stdlib.h>
+#endif
+
+extern struct thd_rnd_service_st {
+  double (*thd_rnd_ptr)(MYSQL_THD thd);
+  void   (*thd_c_r_p_ptr)(MYSQL_THD thd, char *to, size_t length);
+} *thd_rnd_service;
+
+#ifdef MYSQL_DYNAMIC_PLUGIN
+#define thd_rnd(A) thd_rnd_service->thd_rnd_ptr(A)
+#define thd_create_random_password(A,B,C) thd_rnd_service->thd_c_r_p_ptr(A,B,C)
+#else
+
+double thd_rnd(MYSQL_THD thd);
+
+/**
+  Generate string of printable random characters of requested length.
+
+  @param to[out]      Buffer for generation; must be at least length+1 bytes
+                      long; result string is always null-terminated
+  @param length[in]   How many random characters to put in buffer
+*/
+void thd_create_random_password(MYSQL_THD thd, char *to, size_t length);
+
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#define MYSQL_SERVICE_THD_RND_INCLUDED
+#endif

include/mysql/services.h

@@ -32,6 +32,7 @@ extern "C" {
 #include <mysql/service_base64.h>
 #include <mysql/service_logger.h>
 #include <mysql/service_thd_autoinc.h>
+#include <mysql/service_thd_rnd.h>
 #include <mysql/service_thd_error_context.h>
 #include <mysql/service_thd_specifics.h>
 #include <mysql/service_encryption.h>

include/service_versions.h

@@ -34,6 +34,7 @@
 #define VERSION_wsrep                   0x0201
 #define VERSION_logger                  0x0100
 #define VERSION_base64                  0x0100
+#define VERSION_thd_rnd                 0x0100
 #define VERSION_thd_autoinc             0x0100
 #define VERSION_thd_error_context       0x0100
 #define VERSION_thd_specifics           0x0100

libservices/CMakeLists.txt

@@ -22,6 +22,7 @@ SET(MYSQLSERVICES_SOURCES
   thd_timezone_service.c
   thd_autoinc_service.c
   thd_error_context_service.c
+  thd_rnd_service.c
   thd_specifics_service.c
   progress_report_service.c
   debug_sync_service.c

libservices/thd_rnd_service.c

@@ -0,0 +1,17 @@
+/* Copyright (C) 2017 MariaDB Corporation
+
+   This program 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 of the License.
+
+   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 St, Fifth Floor, Boston, MA 02110-1301  USA */
+
+#include <service_versions.h>
+SERVICE_VERSION thd_rnd_service= (void *) VERSION_thd_rnd;

sql/password.c

@@ -38,7 +38,7 @@
 
   The new authentication is performed in following manner:
 
-  SERVER:  public_seed=create_random_string()
+  SERVER:  public_seed=thd_create_random_password()
            send(public_seed)
 
   CLIENT:  recv(public_seed)
@@ -278,6 +278,7 @@ void make_password_from_salt_323(char *to, const ulong *salt)
      **************** MySQL 4.1.1 authentication routines *************
 */
 
+#if MYSQL_VERSION_ID < 0x100200
 /**
     Generate string of printable random characters of requested length.
   
@@ -296,6 +297,9 @@ void create_random_string(char *to, uint length,
     *to= (char) (my_rnd(rand_st)*94+33);
   *to= '\0';
 }
+#else
+#error
+#endif
 
 
 /* Character to use as version identifier for version 4.1 */

sql/sql_acl.cc

@@ -11313,7 +11313,7 @@ static bool send_server_handshake_packet(MPVIO_EXT *mpvio,
         native_password_plugin will have to send it in a separate packet,
         adding one more round trip.
       */
-      create_random_string(thd->scramble, SCRAMBLE_LENGTH, &thd->rand);
+      thd_create_random_password(thd, thd->scramble, SCRAMBLE_LENGTH);
       data= thd->scramble;
     }
     data_len= SCRAMBLE_LENGTH;
@@ -12671,7 +12671,7 @@ static int native_password_authenticate(MYSQL_PLUGIN_VIO *vio,
   /* generate the scramble, or reuse the old one */
   if (thd->scramble[SCRAMBLE_LENGTH])
   {
-    create_random_string(thd->scramble, SCRAMBLE_LENGTH, &thd->rand);
+    thd_create_random_password(thd, thd->scramble, SCRAMBLE_LENGTH);
     /* and send it to the client */
     if (mpvio->write_packet(mpvio, (uchar*)thd->scramble, SCRAMBLE_LENGTH + 1))
       DBUG_RETURN(CR_AUTH_HANDSHAKE);
@@ -12755,7 +12755,7 @@ static int old_password_authenticate(MYSQL_PLUGIN_VIO *vio,
   /* generate the scramble, or reuse the old one */
   if (thd->scramble[SCRAMBLE_LENGTH])
   {
-    create_random_string(thd->scramble, SCRAMBLE_LENGTH, &thd->rand);
+    thd_create_random_password(thd, thd->scramble, SCRAMBLE_LENGTH);
     /* and send it to the client */
     if (mpvio->write_packet(mpvio, (uchar*)thd->scramble, SCRAMBLE_LENGTH + 1))
       return CR_AUTH_HANDSHAKE;

sql/sql_class.cc

@@ -4475,6 +4475,28 @@ extern "C" int thd_is_connected(MYSQL_THD thd)
 }
 
 
+extern "C" double thd_rnd(MYSQL_THD thd)
+{
+  return my_rnd(&thd->rand);
+}
+
+
+/**
+  Generate string of printable random characters of requested length.
+
+  @param to[out]      Buffer for generation; must be at least length+1 bytes
+                      long; result string is always null-terminated
+  @param length[in]   How many random characters to put in buffer
+*/
+extern "C" void thd_create_random_password(MYSQL_THD thd,
+                                           char *to, size_t length)
+{
+  for (char *end= to + length; to < end; to++)
+    *to= (char) (my_rnd(&thd->rand)*94 + 33);
+  *to= '\0';
+}
+
+
 #ifdef INNODB_COMPATIBILITY_HOOKS
 extern "C" const struct charset_info_st *thd_charset(MYSQL_THD thd)
 {

sql/sql_plugin_services.ic

@@ -119,6 +119,11 @@ static struct thd_autoinc_service_st thd_autoinc_handler= {
   thd_get_autoinc
 };
 
+static struct thd_rnd_service_st thd_rnd_handler= {
+  thd_rnd,
+  thd_create_random_password
+};
+
 static struct base64_service_st base64_handler= {
   base64_needed_encoded_length,
   base64_encode_max_arg_length,
@@ -205,6 +210,7 @@ static struct st_service_ref list_of_services[]=
   { "my_md5_service",              VERSION_my_md5,              &my_md5_handler},
   { "logger_service",              VERSION_logger,              &logger_service_handler },
   { "base64_service",              VERSION_base64,              &base64_handler },
+  { "thd_rnd_service",             VERSION_thd_rnd,             &thd_rnd_handler },
   { "thd_autoinc_service",         VERSION_thd_autoinc,         &thd_autoinc_handler },
   { "wsrep_service",               VERSION_wsrep,               &wsrep_handler },
   { "encryption_service",          VERSION_encryption,          &encryption_handler },