sqlcipher/src/attach.c at multi-lib · sqlcipher/sqlcipher · GitHub

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** 2003 April 6

** The author disclaims copyright to this source code. In place of

** a legal notice, here is a blessing:

** May you do good and not evil.

** May you find forgiveness for yourself and forgive others.

** May you share freely, never taking more than you give.

*************************************************************************

** This file contains code used to implement the ATTACH and DETACH commands.

#include "sqliteInt.h"

#ifndef SQLITE_OMIT_ATTACH

** Resolve an expression that was part of an ATTACH or DETACH statement. This

** is slightly different from resolving a normal SQL expression, because simple

** identifiers are treated as strings, not possible column names or aliases.

** i.e. if the parser sees:

** ATTACH DATABASE abc AS def

** it treats the two expressions as literal strings 'abc' and 'def' instead of

** looking for columns of the same name.

** This only applies to the root node of pExpr, so the statement:

** ATTACH DATABASE abc||def AS 'db2'

** will fail because neither abc or def can be resolved.

static int resolveAttachExpr(NameContext *pName, Expr *pExpr)

{

int rc = SQLITE_OK;

if( pExpr ){

if( pExpr->op!=TK_ID ){

rc = sqlite3ResolveExprNames(pName, pExpr);

if( rc==SQLITE_OK && !sqlite3ExprIsConstant(pExpr) ){

sqlite3ErrorMsg(pName->pParse, "invalid name: \"%s\"", pExpr->u.zToken);

return SQLITE_ERROR;

}

}else{

pExpr->op = TK_STRING;

}

return rc;

}

** An SQL user-function registered to do the work of an ATTACH statement. The

** three arguments to the function come directly from an attach statement:

** ATTACH DATABASE x AS y KEY z

** SELECT sqlite_attach(x, y, z)

** If the optional "KEY z" syntax is omitted, an SQL NULL is passed as the

** third argument.

static void attachFunc(

sqlite3_context *context,

int NotUsed,

sqlite3_value **argv

){

int i;

int rc = 0;

sqlite3 *db = sqlite3_context_db_handle(context);

const char *zName;

const char *zFile;

char *zPath = 0;

char *zErr = 0;

unsigned int flags;

Db *aNew;

char *zErrDyn = 0;

sqlite3_vfs *pVfs;

UNUSED_PARAMETER(NotUsed);

zFile = (const char *)sqlite3_value_text(argv[0]);

zName = (const char *)sqlite3_value_text(argv[1]);

if( zFile==0 ) zFile = "";

if( zName==0 ) zName = "";

/* Check for the following errors:

** * Too many attached databases,

** * Transaction currently open

** * Specified database name already being used.

if( db->nDb>=db->aLimit[SQLITE_LIMIT_ATTACHED]+2 ){

zErrDyn = sqlite3MPrintf(db, "too many attached databases - max %d",

db->aLimit[SQLITE_LIMIT_ATTACHED]

);

goto attach_error;

}

if( !db->autoCommit ){

zErrDyn = sqlite3MPrintf(db, "cannot ATTACH database within transaction");

goto attach_error;

}

for(i=0; i<db->nDb; i++){

char *z = db->aDb[i].zName;

assert( z && zName );

if( sqlite3StrICmp(z, zName)==0 ){

zErrDyn = sqlite3MPrintf(db, "database %s is already in use", zName);

goto attach_error;

}

/* Allocate the new entry in the db->aDb[] array and initialize the schema

** hash tables.

if( db->aDb==db->aDbStatic ){

aNew = sqlite3DbMallocRaw(db, sizeof(db->aDb[0])*3 );

if( aNew==0 ) return;

memcpy(aNew, db->aDb, sizeof(db->aDb[0])*2);

}else{

aNew = sqlite3DbRealloc(db, db->aDb, sizeof(db->aDb[0])*(db->nDb+1) );

if( aNew==0 ) return;

}

db->aDb = aNew;

aNew = &db->aDb[db->nDb];

memset(aNew, 0, sizeof(*aNew));

/* Open the database file. If the btree is successfully opened, use

** it to obtain the database schema. At this point the schema may

** or may not be initialized.

flags = db->openFlags;

rc = sqlite3ParseUri(db->pVfs->zName, zFile, &flags, &pVfs, &zPath, &zErr);

if( rc!=SQLITE_OK ){

if( rc==SQLITE_NOMEM ) db->mallocFailed = 1;

sqlite3_result_error(context, zErr, -1);

sqlite3_free(zErr);

return;

}

assert( pVfs );

flags |= SQLITE_OPEN_MAIN_DB;

rc = sqlite3BtreeOpen(pVfs, zPath, db, &aNew->pBt, 0, flags);

sqlite3_free( zPath );

db->nDb++;

if( rc==SQLITE_CONSTRAINT ){

rc = SQLITE_ERROR;

zErrDyn = sqlite3MPrintf(db, "database is already attached");

}else if( rc==SQLITE_OK ){

Pager *pPager;

aNew->pSchema = sqlite3SchemaGet(db, aNew->pBt);

if( !aNew->pSchema ){

rc = SQLITE_NOMEM;

}else if( aNew->pSchema->file_format && aNew->pSchema->enc!=ENC(db) ){

zErrDyn = sqlite3MPrintf(db,

"attached databases must use the same text encoding as main database");

rc = SQLITE_ERROR;

}

pPager = sqlite3BtreePager(aNew->pBt);

sqlite3PagerLockingMode(pPager, db->dfltLockMode);

sqlite3BtreeSecureDelete(aNew->pBt,

sqlite3BtreeSecureDelete(db->aDb[0].pBt,-1) );

}

aNew->safety_level = 3;

aNew->zName = sqlite3DbStrDup(db, zName);

if( rc==SQLITE_OK && aNew->zName==0 ){

rc = SQLITE_NOMEM;

}

#ifdef SQLITE_HAS_CODEC

if( rc==SQLITE_OK ){

extern int sqlite3CodecAttach(sqlite3*, int, const void*, int);

extern void sqlite3CodecGetKey(sqlite3*, int, void**, int*);

int nKey;

char *zKey;

int t = sqlite3_value_type(argv[2]);

switch( t ){

case SQLITE_INTEGER:

case SQLITE_FLOAT:

zErrDyn = sqlite3DbStrDup(db, "Invalid key value");

rc = SQLITE_ERROR;

break;

case SQLITE_TEXT:

case SQLITE_BLOB:

nKey = sqlite3_value_bytes(argv[2]);

zKey = (char *)sqlite3_value_blob(argv[2]);

rc = sqlite3CodecAttach(db, db->nDb-1, zKey, nKey);

break;

case SQLITE_NULL:

/* No key specified. Use the key from the main database */

sqlite3CodecGetKey(db, 0, (void**)&zKey, &nKey);

if( nKey>0 || sqlite3BtreeGetReserve(db->aDb[0].pBt)>0 ){

rc = sqlite3CodecAttach(db, db->nDb-1, zKey, nKey);

}

break;

}

#endif

/* If the file was opened successfully, read the schema for the new database.

** If this fails, or if opening the file failed, then close the file and

** remove the entry from the db->aDb[] array. i.e. put everything back the way

** we found it.

if( rc==SQLITE_OK ){

sqlite3BtreeEnterAll(db);

rc = sqlite3Init(db, &zErrDyn);

sqlite3BtreeLeaveAll(db);

}

if( rc ){

int iDb = db->nDb - 1;

assert( iDb>=2 );

if( db->aDb[iDb].pBt ){

sqlite3BtreeClose(db->aDb[iDb].pBt);

db->aDb[iDb].pBt = 0;

db->aDb[iDb].pSchema = 0;

}

sqlite3ResetAllSchemasOfConnection(db);

db->nDb = iDb;

if( rc==SQLITE_NOMEM || rc==SQLITE_IOERR_NOMEM ){

db->mallocFailed = 1;

sqlite3DbFree(db, zErrDyn);

zErrDyn = sqlite3MPrintf(db, "out of memory");

}else if( zErrDyn==0 ){

zErrDyn = sqlite3MPrintf(db, "unable to open database: %s", zFile);

}

goto attach_error;

}

return;

attach_error:

/* Return an error if we get here */

if( zErrDyn ){

sqlite3_result_error(context, zErrDyn, -1);

sqlite3DbFree(db, zErrDyn);

}

if( rc ) sqlite3_result_error_code(context, rc);

}

** An SQL user-function registered to do the work of an DETACH statement. The

** three arguments to the function come directly from a detach statement:

** DETACH DATABASE x

** SELECT sqlite_detach(x)

static void detachFunc(

sqlite3_context *context,

int NotUsed,

sqlite3_value **argv

){

const char *zName = (const char *)sqlite3_value_text(argv[0]);

sqlite3 *db = sqlite3_context_db_handle(context);

int i;

Db *pDb = 0;

char zErr[128];

UNUSED_PARAMETER(NotUsed);

if( zName==0 ) zName = "";

for(i=0; i<db->nDb; i++){

pDb = &db->aDb[i];

if( pDb->pBt==0 ) continue;

if( sqlite3StrICmp(pDb->zName, zName)==0 ) break;

}

if( i>=db->nDb ){

sqlite3_snprintf(sizeof(zErr),zErr, "no such database: %s", zName);

goto detach_error;

}

if( i<2 ){

sqlite3_snprintf(sizeof(zErr),zErr, "cannot detach database %s", zName);

goto detach_error;

}

if( !db->autoCommit ){

sqlite3_snprintf(sizeof(zErr), zErr,

"cannot DETACH database within transaction");

goto detach_error;

}

if( sqlite3BtreeIsInReadTrans(pDb->pBt) || sqlite3BtreeIsInBackup(pDb->pBt) ){

sqlite3_snprintf(sizeof(zErr),zErr, "database %s is locked", zName);

goto detach_error;

}

sqlite3BtreeClose(pDb->pBt);

pDb->pBt = 0;

pDb->pSchema = 0;

sqlite3ResetAllSchemasOfConnection(db);

return;

detach_error:

sqlite3_result_error(context, zErr, -1);

}

** This procedure generates VDBE code for a single invocation of either the

** sqlite_detach() or sqlite_attach() SQL user functions.

static void codeAttach(

Parse *pParse, /* The parser context */

int type, /* Either SQLITE_ATTACH or SQLITE_DETACH */

FuncDef const *pFunc,/* FuncDef wrapper for detachFunc() or attachFunc() */

Expr *pAuthArg, /* Expression to pass to authorization callback */

Expr *pFilename, /* Name of database file */

Expr *pDbname, /* Name of the database to use internally */

Expr *pKey /* Database key for encryption extension */

){

int rc;

NameContext sName;

Vdbe *v;

sqlite3* db = pParse->db;

int regArgs;

memset(&sName, 0, sizeof(NameContext));

sName.pParse = pParse;

if(

SQLITE_OK!=(rc = resolveAttachExpr(&sName, pFilename)) ||

SQLITE_OK!=(rc = resolveAttachExpr(&sName, pDbname)) ||

SQLITE_OK!=(rc = resolveAttachExpr(&sName, pKey))

){

pParse->nErr++;

goto attach_end;

}

#ifndef SQLITE_OMIT_AUTHORIZATION

if( pAuthArg ){

char *zAuthArg;

if( pAuthArg->op==TK_STRING ){

zAuthArg = pAuthArg->u.zToken;

}else{

zAuthArg = 0;

}

rc = sqlite3AuthCheck(pParse, type, zAuthArg, 0, 0);

if(rc!=SQLITE_OK ){

goto attach_end;

}

#endif /* SQLITE_OMIT_AUTHORIZATION */

v = sqlite3GetVdbe(pParse);

regArgs = sqlite3GetTempRange(pParse, 4);

sqlite3ExprCode(pParse, pFilename, regArgs);

sqlite3ExprCode(pParse, pDbname, regArgs+1);

sqlite3ExprCode(pParse, pKey, regArgs+2);

assert( v || db->mallocFailed );

if( v ){

sqlite3VdbeAddOp3(v, OP_Function, 0, regArgs+3-pFunc->nArg, regArgs+3);

assert( pFunc->nArg==-1 || (pFunc->nArg&0xff)==pFunc->nArg );

sqlite3VdbeChangeP5(v, (u8)(pFunc->nArg));

sqlite3VdbeChangeP4(v, -1, (char *)pFunc, P4_FUNCDEF);

/* Code an OP_Expire. For an ATTACH statement, set P1 to true (expire this

** statement only). For DETACH, set it to false (expire all existing

** statements).

sqlite3VdbeAddOp1(v, OP_Expire, (type==SQLITE_ATTACH));

}

attach_end:

sqlite3ExprDelete(db, pFilename);

sqlite3ExprDelete(db, pDbname);

sqlite3ExprDelete(db, pKey);

}

** Called by the parser to compile a DETACH statement.

** DETACH pDbname

void sqlite3Detach(Parse *pParse, Expr *pDbname){

static const FuncDef detach_func = {

1, /* nArg */

SQLITE_UTF8, /* iPrefEnc */

0, /* flags */

0, /* pUserData */

0, /* pNext */

detachFunc, /* xFunc */

0, /* xStep */

0, /* xFinalize */

"sqlite_detach", /* zName */

0, /* pHash */

0 /* pDestructor */

};

codeAttach(pParse, SQLITE_DETACH, &detach_func, pDbname, 0, 0, pDbname);

}

** Called by the parser to compile an ATTACH statement.

** ATTACH p AS pDbname KEY pKey

void sqlite3Attach(Parse *pParse, Expr *p, Expr *pDbname, Expr *pKey){

static const FuncDef attach_func = {

3, /* nArg */

SQLITE_UTF8, /* iPrefEnc */

0, /* flags */

0, /* pUserData */

0, /* pNext */

attachFunc, /* xFunc */

0, /* xStep */

0, /* xFinalize */

"sqlite_attach", /* zName */

0, /* pHash */

0 /* pDestructor */

};

codeAttach(pParse, SQLITE_ATTACH, &attach_func, p, p, pDbname, pKey);

}

#endif /* SQLITE_OMIT_ATTACH */

** Initialize a DbFixer structure. This routine must be called prior

** to passing the structure to one of the sqliteFixAAAA() routines below.

** The return value indicates whether or not fixation is required. TRUE

** means we do need to fix the database references, FALSE means we do not.

int sqlite3FixInit(

DbFixer *pFix, /* The fixer to be initialized */

Parse *pParse, /* Error messages will be written here */

int iDb, /* This is the database that must be used */

const char *zType, /* "view", "trigger", or "index" */

const Token *pName /* Name of the view, trigger, or index */

){

sqlite3 *db;

if( NEVER(iDb<0) || iDb==1 ) return 0;

db = pParse->db;

assert( db->nDb>iDb );

pFix->pParse = pParse;

pFix->zDb = db->aDb[iDb].zName;

pFix->pSchema = db->aDb[iDb].pSchema;

pFix->zType = zType;

pFix->pName = pName;

return 1;

}

** The following set of routines walk through the parse tree and assign

** a specific database to all table references where the database name

** was left unspecified in the original SQL statement. The pFix structure

** must have been initialized by a prior call to sqlite3FixInit().

** These routines are used to make sure that an index, trigger, or

** view in one database does not refer to objects in a different database.

** (Exception: indices, triggers, and views in the TEMP database are

** allowed to refer to anything.) If a reference is explicitly made

** to an object in a different database, an error message is added to

** pParse->zErrMsg and these routines return non-zero. If everything

** checks out, these routines return 0.

int sqlite3FixSrcList(

DbFixer *pFix, /* Context of the fixation */

SrcList *pList /* The Source list to check and modify */

){

int i;

const char *zDb;

struct SrcList_item *pItem;

if( NEVER(pList==0) ) return 0;

zDb = pFix->zDb;

for(i=0, pItem=pList->a; i<pList->nSrc; i++, pItem++){

if( pItem->zDatabase && sqlite3StrICmp(pItem->zDatabase, zDb) ){

sqlite3ErrorMsg(pFix->pParse,

"%s %T cannot reference objects in database %s",

pFix->zType, pFix->pName, pItem->zDatabase);

return 1;

}

sqlite3DbFree(pFix->pParse->db, pItem->zDatabase);

pItem->zDatabase = 0;

pItem->pSchema = pFix->pSchema;

#if !defined(SQLITE_OMIT_VIEW) || !defined(SQLITE_OMIT_TRIGGER)

if( sqlite3FixSelect(pFix, pItem->pSelect) ) return 1;

if( sqlite3FixExpr(pFix, pItem->pOn) ) return 1;

#endif

}

return 0;

}

#if !defined(SQLITE_OMIT_VIEW) || !defined(SQLITE_OMIT_TRIGGER)

int sqlite3FixSelect(

DbFixer *pFix, /* Context of the fixation */

Select *pSelect /* The SELECT statement to be fixed to one database */

){

while( pSelect ){

if( sqlite3FixExprList(pFix, pSelect->pEList) ){

return 1;

}

if( sqlite3FixSrcList(pFix, pSelect->pSrc) ){

return 1;

}

if( sqlite3FixExpr(pFix, pSelect->pWhere) ){

return 1;

}

if( sqlite3FixExpr(pFix, pSelect->pHaving) ){

return 1;

}

pSelect = pSelect->pPrior;

}

return 0;

}

int sqlite3FixExpr(

DbFixer *pFix, /* Context of the fixation */

Expr *pExpr /* The expression to be fixed to one database */

){

while( pExpr ){

if( ExprHasAnyProperty(pExpr, EP_TokenOnly) ) break;

if( ExprHasProperty(pExpr, EP_xIsSelect) ){

if( sqlite3FixSelect(pFix, pExpr->x.pSelect) ) return 1;

}else{

if( sqlite3FixExprList(pFix, pExpr->x.pList) ) return 1;

}

if( sqlite3FixExpr(pFix, pExpr->pRight) ){

return 1;

}

pExpr = pExpr->pLeft;

}

return 0;

}

int sqlite3FixExprList(

DbFixer *pFix, /* Context of the fixation */

ExprList *pList /* The expression to be fixed to one database */

){

int i;

struct ExprList_item *pItem;

if( pList==0 ) return 0;

for(i=0, pItem=pList->a; i<pList->nExpr; i++, pItem++){

if( sqlite3FixExpr(pFix, pItem->pExpr) ){

return 1;

}

return 0;

}

#endif

#ifndef SQLITE_OMIT_TRIGGER

int sqlite3FixTriggerStep(

DbFixer *pFix, /* Context of the fixation */

TriggerStep *pStep /* The trigger step be fixed to one database */

){

while( pStep ){

if( sqlite3FixSelect(pFix, pStep->pSelect) ){

return 1;

}

if( sqlite3FixExpr(pFix, pStep->pWhere) ){

return 1;

}

if( sqlite3FixExprList(pFix, pStep->pExprList) ){

return 1;

}

pStep = pStep->pNext;

}

return 0;

}

#endif

sqlcipher/src/attach.c at multi-lib · sqlcipher/sqlcipher · GitHub

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