mirror of
https://git.postgresql.org/git/postgresql.git
synced 2024-10-04 11:06:48 +02:00
aff700a160
that refers to a now-deleted userid. Per gripe from Chris Ochs.
698 lines
16 KiB
C
698 lines
16 KiB
C
/*-------------------------------------------------------------------------
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*
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* variable.c
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* Routines for handling specialized SET variables.
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*
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*
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* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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*
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* IDENTIFICATION
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* $PostgreSQL: pgsql/src/backend/commands/variable.c,v 1.99 2004/08/11 21:10:36 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#include "postgres.h"
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#include <ctype.h>
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#include "access/xact.h"
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#include "catalog/pg_shadow.h"
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#include "commands/variable.h"
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#include "miscadmin.h"
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#include "parser/scansup.h"
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#include "pgtime.h"
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#include "utils/builtins.h"
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#include "utils/guc.h"
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#include "utils/syscache.h"
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#include "utils/tqual.h"
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#include "mb/pg_wchar.h"
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/*
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* DATESTYLE
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*/
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/*
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* assign_datestyle: GUC assign_hook for datestyle
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*/
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const char *
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assign_datestyle(const char *value, bool doit, GucSource source)
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{
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int newDateStyle = DateStyle;
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int newDateOrder = DateOrder;
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bool ok = true;
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int scnt = 0,
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ocnt = 0;
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char *rawstring;
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char *result;
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List *elemlist;
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ListCell *l;
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/* Need a modifiable copy of string */
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rawstring = pstrdup(value);
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/* Parse string into list of identifiers */
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if (!SplitIdentifierString(rawstring, ',', &elemlist))
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{
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/* syntax error in list */
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pfree(rawstring);
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list_free(elemlist);
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if (source >= PGC_S_INTERACTIVE)
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ereport(ERROR,
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(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
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errmsg("invalid list syntax for parameter \"datestyle\"")));
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return NULL;
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}
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foreach(l, elemlist)
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{
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char *tok = (char *) lfirst(l);
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/* Ugh. Somebody ought to write a table driven version -- mjl */
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if (pg_strcasecmp(tok, "ISO") == 0)
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{
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newDateStyle = USE_ISO_DATES;
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scnt++;
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}
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else if (pg_strcasecmp(tok, "SQL") == 0)
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{
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newDateStyle = USE_SQL_DATES;
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scnt++;
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}
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else if (pg_strncasecmp(tok, "POSTGRES", 8) == 0)
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{
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newDateStyle = USE_POSTGRES_DATES;
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scnt++;
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}
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else if (pg_strcasecmp(tok, "GERMAN") == 0)
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{
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newDateStyle = USE_GERMAN_DATES;
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scnt++;
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/* GERMAN also sets DMY, unless explicitly overridden */
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if (ocnt == 0)
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newDateOrder = DATEORDER_DMY;
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}
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else if (pg_strcasecmp(tok, "YMD") == 0)
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{
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newDateOrder = DATEORDER_YMD;
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ocnt++;
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}
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else if (pg_strcasecmp(tok, "DMY") == 0 ||
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pg_strncasecmp(tok, "EURO", 4) == 0)
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{
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newDateOrder = DATEORDER_DMY;
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ocnt++;
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}
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else if (pg_strcasecmp(tok, "MDY") == 0 ||
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pg_strcasecmp(tok, "US") == 0 ||
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pg_strncasecmp(tok, "NONEURO", 7) == 0)
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{
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newDateOrder = DATEORDER_MDY;
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ocnt++;
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}
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else if (pg_strcasecmp(tok, "DEFAULT") == 0)
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{
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/*
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* Easiest way to get the current DEFAULT state is to fetch
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* the DEFAULT string from guc.c and recursively parse it.
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*
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* We can't simply "return assign_datestyle(...)" because we need
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* to handle constructs like "DEFAULT, ISO".
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*/
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int saveDateStyle = DateStyle;
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int saveDateOrder = DateOrder;
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const char *subval;
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subval = assign_datestyle(GetConfigOptionResetString("datestyle"),
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true, source);
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if (scnt == 0)
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newDateStyle = DateStyle;
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if (ocnt == 0)
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newDateOrder = DateOrder;
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DateStyle = saveDateStyle;
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DateOrder = saveDateOrder;
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if (!subval)
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{
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ok = false;
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break;
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}
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/* Here we know that our own return value is always malloc'd */
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/* when doit is true */
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free((char *) subval);
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}
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else
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{
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if (source >= PGC_S_INTERACTIVE)
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ereport(ERROR,
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(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
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errmsg("unrecognized \"datestyle\" key word: \"%s\"",
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tok)));
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ok = false;
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break;
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}
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}
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if (scnt > 1 || ocnt > 1)
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ok = false;
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pfree(rawstring);
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list_free(elemlist);
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if (!ok)
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{
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if (source >= PGC_S_INTERACTIVE)
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ereport(ERROR,
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(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
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errmsg("conflicting \"datestyle\" specifications")));
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return NULL;
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}
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/*
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* If we aren't going to do the assignment, just return OK indicator.
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*/
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if (!doit)
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return value;
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/*
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* Prepare the canonical string to return. GUC wants it malloc'd.
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*/
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result = (char *) malloc(32);
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if (!result)
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return NULL;
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switch (newDateStyle)
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{
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case USE_ISO_DATES:
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strcpy(result, "ISO");
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break;
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case USE_SQL_DATES:
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strcpy(result, "SQL");
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break;
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case USE_GERMAN_DATES:
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strcpy(result, "German");
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break;
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default:
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strcpy(result, "Postgres");
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break;
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}
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switch (newDateOrder)
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{
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case DATEORDER_YMD:
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strcat(result, ", YMD");
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break;
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case DATEORDER_DMY:
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strcat(result, ", DMY");
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break;
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default:
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strcat(result, ", MDY");
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break;
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}
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/*
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* Finally, it's safe to assign to the global variables; the
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* assignment cannot fail now.
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*/
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DateStyle = newDateStyle;
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DateOrder = newDateOrder;
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return result;
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}
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/*
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* TIMEZONE
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*/
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/*
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* assign_timezone: GUC assign_hook for timezone
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*/
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const char *
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assign_timezone(const char *value, bool doit, GucSource source)
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{
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char *result;
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char *endptr;
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double hours;
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/*
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* Check for INTERVAL 'foo'
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*/
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if (pg_strncasecmp(value, "interval", 8) == 0)
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{
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const char *valueptr = value;
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char *val;
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Interval *interval;
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valueptr += 8;
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while (isspace((unsigned char) *valueptr))
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valueptr++;
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if (*valueptr++ != '\'')
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return NULL;
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val = pstrdup(valueptr);
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/* Check and remove trailing quote */
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endptr = strchr(val, '\'');
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if (!endptr || endptr[1] != '\0')
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{
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pfree(val);
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return NULL;
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}
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*endptr = '\0';
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/*
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* Try to parse it. XXX an invalid interval format will result in
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* ereport, which is not desirable for GUC. We did what we could
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* to guard against this in flatten_set_variable_args, but a
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* string coming in from postgresql.conf might contain anything.
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*/
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interval = DatumGetIntervalP(DirectFunctionCall3(interval_in,
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CStringGetDatum(val),
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ObjectIdGetDatum(InvalidOid),
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Int32GetDatum(-1)));
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pfree(val);
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if (interval->month != 0)
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{
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if (source >= PGC_S_INTERACTIVE)
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ereport(ERROR,
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(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
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errmsg("invalid interval value for time zone: month not allowed")));
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pfree(interval);
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return NULL;
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}
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if (doit)
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{
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/* Here we change from SQL to Unix sign convention */
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CTimeZone = -interval->time;
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HasCTZSet = true;
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}
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pfree(interval);
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}
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else
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{
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/*
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* Try it as a numeric number of hours (possibly fractional).
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*/
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hours = strtod(value, &endptr);
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if (endptr != value && *endptr == '\0')
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{
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if (doit)
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{
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/* Here we change from SQL to Unix sign convention */
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CTimeZone = -hours * 3600;
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HasCTZSet = true;
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}
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}
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else if (pg_strcasecmp(value, "UNKNOWN") == 0)
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{
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/*
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* UNKNOWN is the value shown as the "default" for TimeZone in
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* guc.c. We interpret it as being a complete no-op; we don't
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* change the timezone setting. Note that if there is a known
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* timezone setting, we will return that name rather than
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* UNKNOWN as the canonical spelling.
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*
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* During GUC initialization, since the timezone library isn't
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* set up yet, pg_get_current_timezone will return NULL and we
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* will leave the setting as UNKNOWN. If this isn't overridden
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* from the config file then pg_timezone_initialize() will
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* eventually select a default value from the environment.
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*/
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const char *curzone = pg_get_current_timezone();
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if (curzone)
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value = curzone;
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}
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else
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{
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/*
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* Otherwise assume it is a timezone name.
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*
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* We have to actually apply the change before we can have any
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* hope of checking it. So, save the old value in case we have
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* to back out. We have to copy since pg_get_current_timezone
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* returns a pointer to its static state.
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*
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* This would all get a lot simpler if the TZ library had a better
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* API that would let us look up and test a timezone name without
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* making it the default.
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*/
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const char *cur_tz;
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char *save_tz;
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bool known,
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acceptable;
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cur_tz = pg_get_current_timezone();
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if (cur_tz)
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save_tz = pstrdup(cur_tz);
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else
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save_tz = NULL;
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known = pg_tzset(value);
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acceptable = known ? tz_acceptable() : false;
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if (doit && known && acceptable)
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{
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/* Keep the changed TZ */
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HasCTZSet = false;
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}
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else
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{
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/*
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* Revert to prior TZ setting; note we haven't changed
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* HasCTZSet in this path, so if we were previously using
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* a fixed offset, we still are.
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*/
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if (save_tz)
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pg_tzset(save_tz);
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else
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{
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/*
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* TZ library wasn't initialized yet. Annoyingly, we will
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* come here during startup because guc-file.l checks
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* the value with doit = false before actually applying.
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* The best approach seems to be as follows:
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*
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* 1. known && acceptable: leave the setting in place,
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* since we'll apply it soon anyway. This is mainly
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* so that any log messages printed during this interval
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* are timestamped with the user's requested timezone.
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*
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* 2. known && !acceptable: revert to GMT for lack of
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* any better idea. (select_default_timezone() may get
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* called later to undo this.)
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*
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* 3. !known: no need to do anything since TZ library
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* did not change its state.
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*
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* Again, this should all go away sometime soon.
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*/
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if (known && !acceptable)
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pg_tzset("GMT");
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}
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/* Complain if it was bad */
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if (!known)
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{
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ereport((source >= PGC_S_INTERACTIVE) ? ERROR : LOG,
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(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
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errmsg("unrecognized time zone name: \"%s\"",
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value)));
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return NULL;
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}
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if (!acceptable)
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{
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ereport((source >= PGC_S_INTERACTIVE) ? ERROR : LOG,
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(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
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errmsg("time zone \"%s\" appears to use leap seconds",
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value),
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errdetail("PostgreSQL does not support leap seconds.")));
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return NULL;
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}
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}
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}
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}
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/*
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* If we aren't going to do the assignment, just return OK indicator.
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*/
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if (!doit)
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return value;
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/*
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* Prepare the canonical string to return. GUC wants it malloc'd.
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*/
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if (HasCTZSet)
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{
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result = (char *) malloc(64);
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if (!result)
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return NULL;
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snprintf(result, 64, "%.5f",
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(double) (-CTimeZone) / 3600.0);
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}
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else
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result = strdup(value);
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return result;
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}
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/*
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* show_timezone: GUC show_hook for timezone
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*/
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const char *
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show_timezone(void)
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{
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const char *tzn;
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if (HasCTZSet)
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{
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Interval interval;
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interval.month = 0;
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interval.time = -CTimeZone;
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tzn = DatumGetCString(DirectFunctionCall1(interval_out,
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IntervalPGetDatum(&interval)));
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}
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else
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tzn = pg_get_current_timezone();
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if (tzn != NULL)
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return tzn;
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return "unknown";
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}
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/*
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* SET TRANSACTION ISOLATION LEVEL
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*/
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const char *
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assign_XactIsoLevel(const char *value, bool doit, GucSource source)
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{
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if (doit && source >= PGC_S_INTERACTIVE)
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{
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if (SerializableSnapshot != NULL)
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ereport(ERROR,
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(errcode(ERRCODE_ACTIVE_SQL_TRANSACTION),
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errmsg("SET TRANSACTION ISOLATION LEVEL must be called before any query")));
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if (IsSubTransaction())
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ereport(ERROR,
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(errcode(ERRCODE_ACTIVE_SQL_TRANSACTION),
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errmsg("SET TRANSACTION ISOLATION LEVEL must not be called in a subtransaction")));
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}
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if (strcmp(value, "serializable") == 0)
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{
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if (doit)
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XactIsoLevel = XACT_SERIALIZABLE;
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}
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else if (strcmp(value, "repeatable read") == 0)
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{
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if (doit)
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XactIsoLevel = XACT_REPEATABLE_READ;
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}
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else if (strcmp(value, "read committed") == 0)
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{
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if (doit)
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XactIsoLevel = XACT_READ_COMMITTED;
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}
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else if (strcmp(value, "read uncommitted") == 0)
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{
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if (doit)
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XactIsoLevel = XACT_READ_UNCOMMITTED;
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}
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else if (strcmp(value, "default") == 0)
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{
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if (doit)
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XactIsoLevel = DefaultXactIsoLevel;
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}
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else
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return NULL;
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return value;
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}
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const char *
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show_XactIsoLevel(void)
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{
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switch (XactIsoLevel)
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{
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case XACT_READ_UNCOMMITTED:
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return "read uncommitted";
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case XACT_READ_COMMITTED:
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return "read committed";
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case XACT_REPEATABLE_READ:
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return "repeatable read";
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case XACT_SERIALIZABLE:
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return "serializable";
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default:
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return "bogus";
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}
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}
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/*
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* Random number seed
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*/
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bool
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assign_random_seed(double value, bool doit, GucSource source)
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{
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/* Can't really roll back on error, so ignore non-interactive setting */
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if (doit && source >= PGC_S_INTERACTIVE)
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DirectFunctionCall1(setseed, Float8GetDatum(value));
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return true;
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}
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const char *
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show_random_seed(void)
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{
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return "unavailable";
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}
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/*
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* encoding handling functions
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*/
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const char *
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assign_client_encoding(const char *value, bool doit, GucSource source)
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{
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int encoding;
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encoding = pg_valid_client_encoding(value);
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if (encoding < 0)
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return NULL;
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/*
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* Note: if we are in startup phase then SetClientEncoding may not be
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* able to really set the encoding. In this case we will assume that
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* the encoding is okay, and InitializeClientEncoding() will fix
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* things once initialization is complete.
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*/
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if (SetClientEncoding(encoding, doit) < 0)
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{
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if (source >= PGC_S_INTERACTIVE)
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ereport(ERROR,
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(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
|
|
errmsg("conversion between %s and %s is not supported",
|
|
value, GetDatabaseEncodingName())));
|
|
return NULL;
|
|
}
|
|
return value;
|
|
}
|
|
|
|
|
|
/*
|
|
* SET SESSION AUTHORIZATION
|
|
*
|
|
* When resetting session auth after an error, we can't expect to do catalog
|
|
* lookups. Hence, the stored form of the value must provide a numeric userid
|
|
* that can be re-used directly. We store the string in the form of
|
|
* NAMEDATALEN 'x's, followed by T or F to indicate superuserness, followed
|
|
* by the numeric userid, followed by a comma, followed by the user name.
|
|
* This cannot be confused with a plain user name because of the NAMEDATALEN
|
|
* limit on names, so we can tell whether we're being passed an initial
|
|
* username or a saved/restored value.
|
|
*/
|
|
extern char *session_authorization_string; /* in guc.c */
|
|
|
|
const char *
|
|
assign_session_authorization(const char *value, bool doit, GucSource source)
|
|
{
|
|
AclId usesysid = 0;
|
|
bool is_superuser = false;
|
|
const char *actual_username = NULL;
|
|
char *result;
|
|
|
|
if (strspn(value, "x") == NAMEDATALEN &&
|
|
(value[NAMEDATALEN] == 'T' || value[NAMEDATALEN] == 'F'))
|
|
{
|
|
/* might be a saved userid string */
|
|
AclId savedsysid;
|
|
char *endptr;
|
|
|
|
savedsysid = (AclId) strtoul(value + NAMEDATALEN + 1, &endptr, 10);
|
|
|
|
if (endptr != value + NAMEDATALEN + 1 && *endptr == ',')
|
|
{
|
|
/* syntactically valid, so break out the data */
|
|
usesysid = savedsysid;
|
|
is_superuser = (value[NAMEDATALEN] == 'T');
|
|
actual_username = endptr + 1;
|
|
}
|
|
}
|
|
|
|
if (usesysid == 0)
|
|
{
|
|
/* not a saved ID, so look it up */
|
|
HeapTuple userTup;
|
|
|
|
if (!IsTransactionState())
|
|
{
|
|
/*
|
|
* Can't do catalog lookups, so fail. The upshot of this is
|
|
* that session_authorization cannot be set in
|
|
* postgresql.conf, which seems like a good thing anyway.
|
|
*/
|
|
return NULL;
|
|
}
|
|
|
|
userTup = SearchSysCache(SHADOWNAME,
|
|
PointerGetDatum(value),
|
|
0, 0, 0);
|
|
if (!HeapTupleIsValid(userTup))
|
|
{
|
|
if (source >= PGC_S_INTERACTIVE)
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_UNDEFINED_OBJECT),
|
|
errmsg("user \"%s\" does not exist", value)));
|
|
return NULL;
|
|
}
|
|
|
|
usesysid = ((Form_pg_shadow) GETSTRUCT(userTup))->usesysid;
|
|
is_superuser = ((Form_pg_shadow) GETSTRUCT(userTup))->usesuper;
|
|
actual_username = value;
|
|
|
|
ReleaseSysCache(userTup);
|
|
}
|
|
|
|
if (doit)
|
|
SetSessionAuthorization(usesysid, is_superuser);
|
|
|
|
result = (char *) malloc(NAMEDATALEN + 32 + strlen(actual_username));
|
|
if (!result)
|
|
return NULL;
|
|
|
|
memset(result, 'x', NAMEDATALEN);
|
|
|
|
sprintf(result + NAMEDATALEN, "%c%lu,%s",
|
|
is_superuser ? 'T' : 'F',
|
|
(unsigned long) usesysid,
|
|
actual_username);
|
|
|
|
return result;
|
|
}
|
|
|
|
const char *
|
|
show_session_authorization(void)
|
|
{
|
|
/*
|
|
* Extract the user name from the stored string; see
|
|
* assign_session_authorization
|
|
*/
|
|
const char *value = session_authorization_string;
|
|
AclId savedsysid;
|
|
char *endptr;
|
|
|
|
Assert(strspn(value, "x") == NAMEDATALEN &&
|
|
(value[NAMEDATALEN] == 'T' || value[NAMEDATALEN] == 'F'));
|
|
|
|
savedsysid = (AclId) strtoul(value + NAMEDATALEN + 1, &endptr, 10);
|
|
|
|
Assert(endptr != value + NAMEDATALEN + 1 && *endptr == ',');
|
|
|
|
return endptr + 1;
|
|
}
|