@ -207,6 +207,10 @@ static char *config_enum_get_options(struct config_enum * record,
const char * prefix , const char * suffix ,
const char * separator ) ;
static bool validate_conf_option ( struct config_generic * record ,
const char * name , const char * value , GucSource source ,
int elevel , bool freemem , void * newval , void * * newextra ) ;
/*
* Options for enum values defined in this module .
@ -3484,6 +3488,9 @@ static void ShowAllGUCConfig(DestReceiver *dest);
static char * _ShowOption ( struct config_generic * record , bool use_units ) ;
static bool validate_option_array_item ( const char * name , const char * value ,
bool skipIfNoPermissions ) ;
static void write_auto_conf_file ( int fd , const char * filename , ConfigVariable * * head_p ) ;
static void replace_auto_config_value ( ConfigVariable * * head_p , ConfigVariable * * tail_p ,
char * config_file , char * name , char * value ) ;
/*
@ -5248,6 +5255,220 @@ config_enum_get_options(struct config_enum * record, const char *prefix,
return retstr . data ;
}
/*
* Validates configuration parameter and value , by calling check hook functions
* depending on record ' s vartype . It validates if the parameter
* value given is in range of expected predefined value for that parameter .
*
* freemem - true indicates memory for newval and newextra will be
* freed in this function , false indicates it will be freed
* by caller .
* Return value :
* 1 : the value is valid
* 0 : the name or value is invalid
*/
bool
validate_conf_option ( struct config_generic * record , const char * name ,
const char * value , GucSource source , int elevel ,
bool freemem , void * newval , void * * newextra )
{
/*
* Validate the value for the passed record , to ensure it is in expected
* range .
*/
switch ( record - > vartype )
{
case PGC_BOOL :
{
struct config_bool * conf = ( struct config_bool * ) record ;
bool tmpnewval ;
if ( newval = = NULL )
newval = & tmpnewval ;
if ( value ! = NULL )
{
if ( ! parse_bool ( value , newval ) )
{
ereport ( elevel ,
( errcode ( ERRCODE_INVALID_PARAMETER_VALUE ) ,
errmsg ( " parameter \" %s \" requires a Boolean value " ,
name ) ) ) ;
return 0 ;
}
if ( ! call_bool_check_hook ( conf , newval , newextra ,
source , elevel ) )
return 0 ;
if ( * newextra & & freemem )
free ( * newextra ) ;
}
}
break ;
case PGC_INT :
{
struct config_int * conf = ( struct config_int * ) record ;
int tmpnewval ;
if ( newval = = NULL )
newval = & tmpnewval ;
if ( value ! = NULL )
{
const char * hintmsg ;
if ( ! parse_int ( value , newval , conf - > gen . flags , & hintmsg ) )
{
ereport ( elevel ,
( errcode ( ERRCODE_INVALID_PARAMETER_VALUE ) ,
errmsg ( " invalid value for parameter \" %s \" : \" %s \" " ,
name , value ) ,
hintmsg ? errhint ( " %s " , _ ( hintmsg ) ) : 0 ) ) ;
return 0 ;
}
if ( * ( ( int * ) newval ) < conf - > min | | * ( ( int * ) newval ) > conf - > max )
{
ereport ( elevel ,
( errcode ( ERRCODE_INVALID_PARAMETER_VALUE ) ,
errmsg ( " %d is outside the valid range for parameter \" %s \" (%d .. %d) " ,
* ( ( int * ) newval ) , name , conf - > min , conf - > max ) ) ) ;
return 0 ;
}
if ( ! call_int_check_hook ( conf , newval , newextra ,
source , elevel ) )
return 0 ;
if ( * newextra & & freemem )
free ( * newextra ) ;
}
}
break ;
case PGC_REAL :
{
struct config_real * conf = ( struct config_real * ) record ;
double tmpnewval ;
if ( newval = = NULL )
newval = & tmpnewval ;
if ( value ! = NULL )
{
if ( ! parse_real ( value , newval ) )
{
ereport ( elevel ,
( errcode ( ERRCODE_INVALID_PARAMETER_VALUE ) ,
errmsg ( " parameter \" %s \" requires a numeric value " ,
name ) ) ) ;
return 0 ;
}
if ( * ( ( double * ) newval ) < conf - > min | | * ( ( double * ) newval ) > conf - > max )
{
ereport ( elevel ,
( errcode ( ERRCODE_INVALID_PARAMETER_VALUE ) ,
errmsg ( " %g is outside the valid range for parameter \" %s \" (%g .. %g) " ,
* ( ( double * ) newval ) , name , conf - > min , conf - > max ) ) ) ;
return 0 ;
}
if ( ! call_real_check_hook ( conf , newval , newextra ,
source , elevel ) )
return 0 ;
if ( * newextra & & freemem )
free ( * newextra ) ;
}
}
break ;
case PGC_STRING :
{
struct config_string * conf = ( struct config_string * ) record ;
char * tempPtr ;
char * * tmpnewval = newval ;
if ( newval = = NULL )
tmpnewval = & tempPtr ;
if ( value ! = NULL )
{
/*
* The value passed by the caller could be transient , so
* we always strdup it .
*/
* tmpnewval = guc_strdup ( elevel , value ) ;
if ( * tmpnewval = = NULL )
return 0 ;
/*
* The only built - in " parsing " check we have is to apply
* truncation if GUC_IS_NAME .
*/
if ( conf - > gen . flags & GUC_IS_NAME )
truncate_identifier ( * tmpnewval , strlen ( * tmpnewval ) , true ) ;
if ( ! call_string_check_hook ( conf , tmpnewval , newextra ,
source , elevel ) )
{
free ( * tmpnewval ) ;
return 0 ;
}
/* Free the malloc'd data if any */
if ( freemem )
{
if ( * tmpnewval ! = NULL )
free ( * tmpnewval ) ;
if ( * newextra ! = NULL )
free ( * newextra ) ;
}
}
}
break ;
case PGC_ENUM :
{
struct config_enum * conf = ( struct config_enum * ) record ;
int tmpnewval ;
if ( newval = = NULL )
newval = & tmpnewval ;
if ( value ! = NULL )
{
if ( ! config_enum_lookup_by_name ( conf , value , newval ) )
{
char * hintmsg ;
hintmsg = config_enum_get_options ( conf ,
" Available values: " ,
" . " , " , " ) ;
ereport ( ERROR ,
( errcode ( ERRCODE_INVALID_PARAMETER_VALUE ) ,
errmsg ( " invalid value for parameter \" %s \" : \" %s \" " ,
name , value ) ,
hintmsg ? errhint ( " %s " , _ ( hintmsg ) ) : 0 ) ) ;
if ( hintmsg ! = NULL )
pfree ( hintmsg ) ;
return 0 ;
}
if ( ! call_enum_check_hook ( conf , newval , newextra ,
source , LOG ) )
return 0 ;
if ( * newextra & & freemem )
free ( * newextra ) ;
}
}
break ;
}
return 1 ;
}
/*
* Sets option ` name ' to given value .
@ -5496,16 +5717,9 @@ set_config_option(const char *name, const char *value,
if ( value )
{
if ( ! parse_bool ( value , & newval ) )
{
ereport ( elevel ,
( errcode ( ERRCODE_INVALID_PARAMETER_VALUE ) ,
errmsg ( " parameter \" %s \" requires a Boolean value " ,
name ) ) ) ;
return 0 ;
}
if ( ! call_bool_check_hook ( conf , & newval , & newextra ,
source , elevel ) )
if ( ! validate_conf_option ( record , name , value , source ,
elevel , false , & newval ,
& newextra ) )
return 0 ;
}
else if ( source = = PGC_S_DEFAULT )
@ -5589,27 +5803,9 @@ set_config_option(const char *name, const char *value,
if ( value )
{
const char * hintmsg ;
if ( ! parse_int ( value , & newval , conf - > gen . flags , & hintmsg ) )
{
ereport ( elevel ,
( errcode ( ERRCODE_INVALID_PARAMETER_VALUE ) ,
errmsg ( " invalid value for parameter \" %s \" : \" %s \" " ,
name , value ) ,
hintmsg ? errhint ( " %s " , _ ( hintmsg ) ) : 0 ) ) ;
return 0 ;
}
if ( newval < conf - > min | | newval > conf - > max )
{
ereport ( elevel ,
( errcode ( ERRCODE_INVALID_PARAMETER_VALUE ) ,
errmsg ( " %d is outside the valid range for parameter \" %s \" (%d .. %d) " ,
newval , name , conf - > min , conf - > max ) ) ) ;
return 0 ;
}
if ( ! call_int_check_hook ( conf , & newval , & newextra ,
source , elevel ) )
if ( ! validate_conf_option ( record , name , value , source ,
elevel , false , & newval ,
& newextra ) )
return 0 ;
}
else if ( source = = PGC_S_DEFAULT )
@ -5693,24 +5889,9 @@ set_config_option(const char *name, const char *value,
if ( value )
{
if ( ! parse_real ( value , & newval ) )
{
ereport ( elevel ,
( errcode ( ERRCODE_INVALID_PARAMETER_VALUE ) ,
errmsg ( " parameter \" %s \" requires a numeric value " ,
name ) ) ) ;
return 0 ;
}
if ( newval < conf - > min | | newval > conf - > max )
{
ereport ( elevel ,
( errcode ( ERRCODE_INVALID_PARAMETER_VALUE ) ,
errmsg ( " %g is outside the valid range for parameter \" %s \" (%g .. %g) " ,
newval , name , conf - > min , conf - > max ) ) ) ;
return 0 ;
}
if ( ! call_real_check_hook ( conf , & newval , & newextra ,
source , elevel ) )
if ( ! validate_conf_option ( record , name , value , source ,
elevel , false , & newval ,
& newextra ) )
return 0 ;
}
else if ( source = = PGC_S_DEFAULT )
@ -5794,28 +5975,11 @@ set_config_option(const char *name, const char *value,
if ( value )
{
/*
* The value passed by the caller could be transient , so
* we always strdup it .
*/
newval = guc_strdup ( elevel , value ) ;
if ( newval = = NULL )
return 0 ;
/*
* The only built - in " parsing " check we have is to apply
* truncation if GUC_IS_NAME .
*/
if ( conf - > gen . flags & GUC_IS_NAME )
truncate_identifier ( newval , strlen ( newval ) , true ) ;
if ( ! call_string_check_hook ( conf , & newval , & newextra ,
source , elevel ) )
{
free ( newval ) ;
if ( ! validate_conf_option ( record , name , value , source ,
elevel , false , & newval ,
& newextra ) )
return 0 ;
}
}
else if ( source = = PGC_S_DEFAULT )
{
/* non-NULL boot_val must always get strdup'd */
@ -5920,26 +6084,9 @@ set_config_option(const char *name, const char *value,
if ( value )
{
if ( ! config_enum_lookup_by_name ( conf , value , & newval ) )
{
char * hintmsg ;
hintmsg = config_enum_get_options ( conf ,
" Available values: " ,
" . " , " , " ) ;
ereport ( elevel ,
( errcode ( ERRCODE_INVALID_PARAMETER_VALUE ) ,
errmsg ( " invalid value for parameter \" %s \" : \" %s \" " ,
name , value ) ,
hintmsg ? errhint ( " %s " , _ ( hintmsg ) ) : 0 ) ) ;
if ( hintmsg )
pfree ( hintmsg ) ;
return 0 ;
}
if ( ! call_enum_check_hook ( conf , & newval , & newextra ,
source , elevel ) )
if ( ! validate_conf_option ( record , name , value , source ,
elevel , false , & newval ,
& newextra ) )
return 0 ;
}
else if ( source = = PGC_S_DEFAULT )
@ -6309,6 +6456,295 @@ flatten_set_variable_args(const char *name, List *args)
return buf . data ;
}
/*
* Writes updated configuration parameter values into
* postgresql . auto . conf . temp file . It traverses the list of parameters
* and quote the string values before writing them to temporaray file .
*/
static void
write_auto_conf_file ( int fd , const char * filename , ConfigVariable * * head_p )
{
ConfigVariable * item ;
StringInfoData buf ;
initStringInfo ( & buf ) ;
appendStringInfoString ( & buf , " # Do not edit this file manually! \n " ) ;
appendStringInfoString ( & buf , " # It will be overwritten by ALTER SYSTEM command. \n " ) ;
/*
* write the file header message before contents , so that if there is no
* item it can contain message
*/
if ( write ( fd , buf . data , buf . len ) < 0 )
ereport ( ERROR ,
( errmsg ( " failed to write to \" %s \" file " , filename ) ) ) ;
resetStringInfo ( & buf ) ;
/*
* traverse the list of parameters , quote the string parameter and write
* it to file . Once all parameters are written fsync the file .
*/
for ( item = * head_p ; item ! = NULL ; item = item - > next )
{
char * escaped ;
appendStringInfoString ( & buf , item - > name ) ;
appendStringInfoString ( & buf , " = " ) ;
appendStringInfoString ( & buf , " \' " ) ;
escaped = escape_single_quotes_ascii ( item - > value ) ;
appendStringInfoString ( & buf , escaped ) ;
free ( escaped ) ;
appendStringInfoString ( & buf , " \' " ) ;
appendStringInfoString ( & buf , " \n " ) ;
if ( write ( fd , buf . data , buf . len ) < 0 )
ereport ( ERROR ,
( errmsg ( " failed to write to \" %s \" file " , filename ) ) ) ;
resetStringInfo ( & buf ) ;
}
if ( pg_fsync ( fd ) ! = 0 )
ereport ( ERROR ,
( errcode_for_file_access ( ) ,
errmsg ( " could not fsync file \" %s \" : %m " , filename ) ) ) ;
pfree ( buf . data ) ;
}
/*
* This function takes list of all configuration parameters in
* postgresql . auto . conf and parameter to be updated as input arguments and
* replace the updated configuration parameter value in a list . If the
* parameter to be updated is new then it is appended to the list of
* parameters .
*/
static void
replace_auto_config_value ( ConfigVariable * * head_p , ConfigVariable * * tail_p ,
char * config_file ,
char * name , char * value )
{
ConfigVariable * item ,
* prev = NULL ;
if ( * head_p ! = NULL )
{
for ( item = * head_p ; item ! = NULL ; item = item - > next )
{
if ( strcmp ( item - > name , name ) = = 0 )
{
pfree ( item - > value ) ;
if ( value ! = NULL )
/* update the parameter value */
item - > value = pstrdup ( value ) ;
else
{
/* delete the configuration parameter from list */
if ( * head_p = = item )
* head_p = item - > next ;
else
prev - > next = item - > next ;
if ( * tail_p = = item )
* tail_p = prev ;
pfree ( item - > name ) ;
pfree ( item - > filename ) ;
pfree ( item ) ;
}
return ;
}
prev = item ;
}
}
if ( value = = NULL )
return ;
item = palloc ( sizeof * item ) ;
item - > name = pstrdup ( name ) ;
item - > value = pstrdup ( value ) ;
item - > filename = pstrdup ( config_file ) ;
item - > next = NULL ;
if ( * head_p = = NULL )
{
item - > sourceline = 1 ;
* head_p = item ;
}
else
{
item - > sourceline = ( * tail_p ) - > sourceline + 1 ;
( * tail_p ) - > next = item ;
}
* tail_p = item ;
return ;
}
/*
* Persist the configuration parameter value .
*
* This function takes all previous configuration parameters
* set by ALTER SYSTEM command and the currently set ones
* and write them all to the automatic configuration file .
*
* The configuration parameters are written to a temporary
* file then renamed to the final name . The template for the
* temporary file is postgresql . auto . conf . temp .
*
* An LWLock is used to serialize writing to the same file .
*
* In case of an error , we leave the original automatic
* configuration file ( postgresql . auto . conf ) intact .
*/
void
AlterSystemSetConfigFile ( AlterSystemStmt * altersysstmt )
{
char * name ;
char * value ;
int Tmpfd = - 1 ;
FILE * infile ;
struct config_generic * record ;
ConfigVariable * head = NULL ;
ConfigVariable * tail = NULL ;
char AutoConfFileName [ MAXPGPATH ] ;
char AutoConfTmpFileName [ MAXPGPATH ] ;
struct stat st ;
void * newextra = NULL ;
if ( ! superuser ( ) )
ereport ( ERROR ,
( errcode ( ERRCODE_INSUFFICIENT_PRIVILEGE ) ,
( errmsg ( " must be superuser to execute ALTER SYSTEM command " ) ) ) ) ;
/*
* Validate the name and arguments [ value1 , value2 . . . ] .
*/
name = altersysstmt - > setstmt - > name ;
switch ( altersysstmt - > setstmt - > kind )
{
case VAR_SET_VALUE :
value = ExtractSetVariableArgs ( altersysstmt - > setstmt ) ;
break ;
case VAR_SET_DEFAULT :
value = NULL ;
break ;
default :
elog ( ERROR , " unrecognized alter system stmt type: %d " ,
altersysstmt - > setstmt - > kind ) ;
break ;
}
record = find_option ( name , false , LOG ) ;
if ( record = = NULL )
ereport ( ERROR ,
( errcode ( ERRCODE_UNDEFINED_OBJECT ) ,
errmsg ( " unrecognized configuration parameter \" %s \" " , name ) ) ) ;
if ( ( record - > context = = PGC_INTERNAL ) | |
( record - > flags & GUC_DISALLOW_IN_FILE ) )
ereport ( ERROR ,
( errcode ( ERRCODE_CANT_CHANGE_RUNTIME_PARAM ) ,
errmsg ( " parameter \" %s \" cannot be changed " ,
name ) ) ) ;
if ( ! validate_conf_option ( record , name , value , PGC_S_FILE ,
ERROR , true , NULL ,
& newextra ) )
ereport ( ERROR ,
( errmsg ( " invalid value for parameter \" %s \" : \" %s \" " , name , value ) ) ) ;
/*
* Use data directory as reference path for postgresql . auto . conf and it ' s
* corresponding temp file
*/
join_path_components ( AutoConfFileName , data_directory , PG_AUTOCONF_FILENAME ) ;
canonicalize_path ( AutoConfFileName ) ;
snprintf ( AutoConfTmpFileName , sizeof ( AutoConfTmpFileName ) , " %s.%s " ,
AutoConfFileName ,
" temp " ) ;
/*
* one backend is allowed to operate on postgresql . auto . conf file , to
* ensure that we need to update the contents of the file with
* AutoFileLock . To ensure crash safety , first the contents are written to
* temporary file and then rename it to postgresql . auto . conf . In case
* there exists a temp file from previous crash , that can be reused .
*/
LWLockAcquire ( AutoFileLock , LW_EXCLUSIVE ) ;
Tmpfd = open ( AutoConfTmpFileName , O_CREAT | O_RDWR | O_TRUNC , S_IRUSR | S_IWUSR ) ;
if ( Tmpfd < 0 )
ereport ( ERROR ,
( errcode_for_file_access ( ) ,
errmsg ( " failed to open auto conf temp file \" %s \" : %m " ,
AutoConfTmpFileName ) ) ) ;
PG_TRY ( ) ;
{
if ( stat ( AutoConfFileName , & st ) = = 0 )
{
/* open postgresql.auto.conf file */
infile = AllocateFile ( AutoConfFileName , " r " ) ;
if ( infile = = NULL )
ereport ( ERROR ,
( errmsg ( " failed to open auto conf file \" %s \" : %m " ,
AutoConfFileName ) ) ) ;
/* Parse the postgresql.auto.conf file */
ParseConfigFp ( infile , AutoConfFileName , 0 , LOG , & head , & tail ) ;
FreeFile ( infile ) ;
}
/*
* replace with new value if the configuration parameter already
* exists OR add it as a new cofiguration parameter in the file .
*/
replace_auto_config_value ( & head , & tail , AutoConfFileName , name , value ) ;
/* Write and sync the New contents to postgresql.auto.conf.temp file */
write_auto_conf_file ( Tmpfd , AutoConfTmpFileName , & head ) ;
close ( Tmpfd ) ;
Tmpfd = - 1 ;
/*
* As the rename is atomic operation , if any problem occurs after this
* at max it can loose the parameters set by last ALTER SYSTEM
* command .
*/
if ( rename ( AutoConfTmpFileName , AutoConfFileName ) < 0 )
ereport ( ERROR ,
( errcode_for_file_access ( ) ,
errmsg ( " could not rename file \" %s \" to \" %s \" : %m " ,
AutoConfTmpFileName , AutoConfFileName ) ) ) ;
}
PG_CATCH ( ) ;
{
if ( Tmpfd > = 0 )
close ( Tmpfd ) ;
unlink ( AutoConfTmpFileName ) ;
FreeConfigVariables ( head ) ;
PG_RE_THROW ( ) ;
}
PG_END_TRY ( ) ;
FreeConfigVariables ( head ) ;
LWLockRelease ( AutoFileLock ) ;
return ;
}
/*
* SET command
Tatsuo Ishii
12 years ago