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Implement differentiation between CURRENT_USER and SESSION_USER as per SQL.

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There is still no effective difference but it will kick in once setuid
functions exist (not included here).  Make old getpgusername() alias for
current_user.
This commit is contained in:
Peter Eisentraut
2000-09-19 18:18:04 +00:00
parent e9c3f0255f
commit 457ac0331c
12 changed files with 166 additions and 65 deletions
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88
src/backend/utils/init/miscinit.c
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@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/utils/init/miscinit.c,v 1.54 2000/09/06 14:15:22 petere Exp $
* $Header: /cvsroot/pgsql/src/backend/utils/init/miscinit.c,v 1.55 2000/09/19 18:17:57 petere Exp $
*
*-------------------------------------------------------------------------
*/
@@ -272,50 +272,65 @@ convertstr(unsigned char *buff, int len, int dest)
#endif
/* ----------------
* GetPgUserName
* ----------------
*/
char *
GetPgUserName(void)
{
HeapTuple tuple;
Oid userid;
userid = GetUserId();
tuple = SearchSysCacheTuple(SHADOWSYSID, ObjectIdGetDatum(userid), 0, 0, 0);
if (!HeapTupleIsValid(tuple))
elog(ERROR, "invalid user id %u", (unsigned) userid);
return pstrdup( NameStr(((Form_pg_shadow) GETSTRUCT(tuple))->usename) );
}
/* ----------------------------------------------------------------
* GetUserId and SetUserId
* User ID things
*
* The session user is determined at connection start and never
* changes. The current user may change when "setuid" functions
* are implemented. Conceptually there is a stack, whose bottom
* is the session user. You are yourself responsible to save and
* restore the current user id if you need to change it.
* ----------------------------------------------------------------
*/
static Oid UserId = InvalidOid;
static Oid CurrentUserId = InvalidOid;
static Oid SessionUserId = InvalidOid;
/*
* This function is relevant for all privilege checks.
*/
Oid
GetUserId()
GetUserId(void)
{
AssertState(OidIsValid(UserId));
return UserId;
AssertState(OidIsValid(CurrentUserId));
return CurrentUserId;
}
void
SetUserId(Oid newid)
{
UserId = newid;
AssertArg(OidIsValid(newid));
CurrentUserId = newid;
}
/*
* This value is only relevant for informational purposes.
*/
Oid
GetSessionUserId(void)
{
AssertState(OidIsValid(SessionUserId));
return SessionUserId;
}
void
SetUserIdFromUserName(const char *username)
SetSessionUserId(Oid newid)
{
AssertArg(OidIsValid(newid));
SessionUserId = newid;
/* Current user defaults to session user. */
if (!OidIsValid(CurrentUserId))
CurrentUserId = newid;
}
void
SetSessionUserIdFromUserName(const char *username)
{
HeapTuple userTup;
@@ -330,13 +345,30 @@ SetUserIdFromUserName(const char *username)
0, 0, 0);
if (!HeapTupleIsValid(userTup))
elog(FATAL, "user \"%s\" does not exist", username);
SetUserId( ((Form_pg_shadow) GETSTRUCT(userTup))->usesysid );
SetSessionUserId( ((Form_pg_shadow) GETSTRUCT(userTup))->usesysid );
}
/*
* Get user name from user id
*/
char *
GetUserName(Oid userid)
{
HeapTuple tuple;
tuple = SearchSysCacheTuple(SHADOWSYSID, ObjectIdGetDatum(userid), 0, 0, 0);
if (!HeapTupleIsValid(tuple))
elog(ERROR, "invalid user id %u", (unsigned) userid);
return pstrdup( NameStr(((Form_pg_shadow) GETSTRUCT(tuple))->usename) );
}
/*-------------------------------------------------------------------------
*
* posmaster pid file stuffs. $DATADIR/postmaster.pid is created when:
* postmaster pid file stuffs. $DATADIR/postmaster.pid is created when:
*
* (1) postmaster starts. In this case pid > 0.
* (2) postgres starts in standalone mode. In this case