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Remove possible segfaults from res_odbc by adding locks around usage of odbc handle

Browse Source 
(closes issue ASTERISK-19011)
Reported by: Walter Doekes
Patches:
	issueA19011_combine_read_and_write_locks_WORK_IN_PROGRESS.patch uploaded by Walter Doekes (license 5674)
review: https://reviewboard.asterisk.org/r/1719/
review: https://reviewboard.asterisk.org/r/1622/
........

Merged revisions 356917 from http://svn.asterisk.org/svn/asterisk/branches/1.8
........

Merged revisions 356961 from http://svn.asterisk.org/svn/asterisk/branches/10


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@356962 65c4cc65-6c06-0410-ace0-fbb531ad65f3
certified/11.2
Jonathan Rose 13 years ago
parent 6214285950
commit 8d258e00f6
1 changed files with 85 additions and 37 deletions
Show Stats Download Patch File Download Diff File

122
res/res_odbc.c
Unescape View File

@ -1,7 +1,7 @@
/*
* Asterisk -- An open source telephony toolkit.
*
* Copyright (C) 1999 - 2008, Digium, Inc.
* Copyright (C) 1999 - 2012, Digium, Inc.
*
* Mark Spencer <markster@digium.com>
*
@ -473,6 +473,7 @@ struct odbc_cache_tables *ast_odbc_find_table(const char *database, const char *
}
/* Table structure not already cached; build it now. */
ast_mutex_lock(&obj->lock);
do {
res = SQLAllocHandle(SQL_HANDLE_STMT, obj->con, &stmt);
if ((res != SQL_SUCCESS) && (res != SQL_SUCCESS_WITH_INFO)) {
@ -543,6 +544,7 @@ struct odbc_cache_tables *ast_odbc_find_table(const char *database, const char *
AST_RWLIST_RDLOCK(&(tableptr->columns));
break;
} while (1);
ast_mutex_unlock(&obj->lock);
AST_RWLIST_UNLOCK(&odbc_tables);
@ -589,6 +591,8 @@ SQLHSTMT ast_odbc_direct_execute(struct odbc_obj *obj, SQLHSTMT (*exec_cb)(struc
int attempt;
SQLHSTMT stmt;
ast_mutex_lock(&obj->lock);
for (attempt = 0; attempt < 2; attempt++) {
stmt = exec_cb(obj, data);
@ -605,6 +609,8 @@ SQLHSTMT ast_odbc_direct_execute(struct odbc_obj *obj, SQLHSTMT (*exec_cb)(struc
}
}
ast_mutex_unlock(&obj->lock);
return stmt;
}
@ -616,6 +622,8 @@ SQLHSTMT ast_odbc_prepare_and_execute(struct odbc_obj *obj, SQLHSTMT (*prepare_c
unsigned char state[10], diagnostic[256];
SQLHSTMT stmt;
ast_mutex_lock(&obj->lock);
for (attempt = 0; attempt < 2; attempt++) {
/* This prepare callback may do more than just prepare -- it may also
* bind parameters, bind results, etc. The real key, here, is that
@ -666,6 +674,8 @@ SQLHSTMT ast_odbc_prepare_and_execute(struct odbc_obj *obj, SQLHSTMT (*prepare_c
}
}
ast_mutex_unlock(&obj->lock);
return stmt;
}
@ -676,6 +686,8 @@ int ast_odbc_smart_execute(struct odbc_obj *obj, SQLHSTMT stmt)
SQLSMALLINT diagbytes=0;
unsigned char state[10], diagnostic[256];
ast_mutex_lock(&obj->lock);
res = SQLExecute(stmt);
if ((res != SQL_SUCCESS) && (res != SQL_SUCCESS_WITH_INFO) && (res != SQL_NO_DATA)) {
if (res == SQL_ERROR) {
@ -693,6 +705,8 @@ int ast_odbc_smart_execute(struct odbc_obj *obj, SQLHSTMT stmt)
obj->last_used = ast_tvnow();
}
ast_mutex_unlock(&obj->lock);
return res;
}
@ -1198,6 +1212,18 @@ static int aoro2_obj_cb(void *vobj, void *arg, int flags)
return 0;
}
/* This function should only be called for shared connections. Otherwise, the lack of
* setting vobj->used breaks EOR_TX searching. For nonshared connections, use
* aoro2_obj_cb instead. */
static int aoro2_obj_notx_cb(void *vobj, void *arg, int flags)
{
struct odbc_obj *obj = vobj;
if (!obj->tx) {
return CMP_MATCH | CMP_STOP;
}
return 0;
}
struct odbc_obj *_ast_odbc_request_obj2(const char *name, struct ast_flags flags, const char *file, const char *function, int lineno)
{
struct odbc_obj *obj = NULL;
@ -1256,7 +1282,13 @@ struct odbc_obj *_ast_odbc_request_obj2(const char *name, struct ast_flags flags
class = NULL;
}
if (obj && ast_test_flag(&flags, RES_ODBC_INDEPENDENT_CONNECTION)) {
if (!obj) {
return NULL;
}
ast_mutex_lock(&obj->lock);
if (ast_test_flag(&flags, RES_ODBC_INDEPENDENT_CONNECTION)) {
/* Ensure this connection has autocommit turned off. */
if (SQLSetConnectAttr(obj->con, SQL_ATTR_AUTOCOMMIT, (void *)SQL_AUTOCOMMIT_OFF, 0) == SQL_ERROR) {
SQLGetDiagField(SQL_HANDLE_DBC, obj->con, 1, SQL_DIAG_NUMBER, &numfields, SQL_IS_INTEGER, &diagbytes);
@ -1295,7 +1327,13 @@ struct odbc_obj *_ast_odbc_request_obj2(const char *name, struct ast_flags flags
}
}
if (obj && SQLSetConnectAttr(obj->con, SQL_ATTR_AUTOCOMMIT, (void *)SQL_AUTOCOMMIT_OFF, 0) == SQL_ERROR) {
if (!obj) {
return NULL;
}
ast_mutex_lock(&obj->lock);
if (SQLSetConnectAttr(obj->con, SQL_ATTR_AUTOCOMMIT, (void *)SQL_AUTOCOMMIT_OFF, 0) == SQL_ERROR) {
SQLGetDiagField(SQL_HANDLE_DBC, obj->con, 1, SQL_DIAG_NUMBER, &numfields, SQL_IS_INTEGER, &diagbytes);
for (i = 0; i < numfields; i++) {
SQLGetDiagRec(SQL_HANDLE_DBC, obj->con, i + 1, state, &nativeerror, diagnostic, sizeof(diagnostic), &diagbytes);
@ -1308,7 +1346,7 @@ struct odbc_obj *_ast_odbc_request_obj2(const char *name, struct ast_flags flags
}
} else {
/* Non-pooled connection: multiple modules can use the same connection. */
if ((obj = ao2_callback(class->obj_container, 0, aoro2_obj_cb, NO_TX))) {
if ((obj = ao2_callback(class->obj_container, 0, aoro2_obj_notx_cb, NO_TX))) {
/* Object is not constructed, so delete outstanding reference to class. */
ast_assert(ao2_ref(class, 0) > 1);
ao2_ref(class, -1);
@ -1335,7 +1373,13 @@ struct odbc_obj *_ast_odbc_request_obj2(const char *name, struct ast_flags flags
}
}
if (obj && SQLSetConnectAttr(obj->con, SQL_ATTR_AUTOCOMMIT, (void *)SQL_AUTOCOMMIT_ON, 0) == SQL_ERROR) {
if (!obj) {
return NULL;
}
ast_mutex_lock(&obj->lock);
if (SQLSetConnectAttr(obj->con, SQL_ATTR_AUTOCOMMIT, (void *)SQL_AUTOCOMMIT_ON, 0) == SQL_ERROR) {
SQLGetDiagField(SQL_HANDLE_DBC, obj->con, 1, SQL_DIAG_NUMBER, &numfields, SQL_IS_INTEGER, &diagbytes);
for (i = 0; i < numfields; i++) {
SQLGetDiagRec(SQL_HANDLE_DBC, obj->con, i + 1, state, &nativeerror, diagnostic, sizeof(diagnostic), &diagbytes);
@ -1348,8 +1392,10 @@ struct odbc_obj *_ast_odbc_request_obj2(const char *name, struct ast_flags flags
}
}
ast_assert(obj != NULL);
/* Set the isolation property */
if (obj && SQLSetConnectAttr(obj->con, SQL_ATTR_TXN_ISOLATION, (void *)(long)obj->parent->isolation, 0) == SQL_ERROR) {
if (SQLSetConnectAttr(obj->con, SQL_ATTR_TXN_ISOLATION, (void *)(long)obj->parent->isolation, 0) == SQL_ERROR) {
SQLGetDiagField(SQL_HANDLE_DBC, obj->con, 1, SQL_DIAG_NUMBER, &numfields, SQL_IS_INTEGER, &diagbytes);
for (i = 0; i < numfields; i++) {
SQLGetDiagRec(SQL_HANDLE_DBC, obj->con, i + 1, state, &nativeerror, diagnostic, sizeof(diagnostic), &diagbytes);
@ -1361,29 +1407,29 @@ struct odbc_obj *_ast_odbc_request_obj2(const char *name, struct ast_flags flags
}
}
if (obj && ast_test_flag(&flags, RES_ODBC_CONNECTED) && !obj->up) {
if (ast_test_flag(&flags, RES_ODBC_CONNECTED) && !obj->up) {
/* Check if this connection qualifies for reconnection, with negative connection cache time */
if (time(NULL) > obj->parent->last_negative_connect.tv_sec + obj->parent->negative_connection_cache.tv_sec) {
odbc_obj_connect(obj);
}
} else if (obj && ast_test_flag(&flags, RES_ODBC_SANITY_CHECK)) {
} else if (ast_test_flag(&flags, RES_ODBC_SANITY_CHECK)) {
ast_odbc_sanity_check(obj);
} else if (obj && obj->parent->idlecheck > 0 && ast_tvdiff_sec(ast_tvnow(), obj->last_used) > obj->parent->idlecheck) {
} else if (obj->parent->idlecheck > 0 && ast_tvdiff_sec(ast_tvnow(), obj->last_used) > obj->parent->idlecheck) {
odbc_obj_connect(obj);
}
#ifdef DEBUG_THREADS
if (obj) {
ast_copy_string(obj->file, file, sizeof(obj->file));
ast_copy_string(obj->function, function, sizeof(obj->function));
obj->lineno = lineno;
}
ast_copy_string(obj->file, file, sizeof(obj->file));
ast_copy_string(obj->function, function, sizeof(obj->function));
obj->lineno = lineno;
#endif
/* We had it locked because of the obj_connects we see here. */
ast_mutex_unlock(&obj->lock);
ast_assert(class == NULL);
if (obj) {
ast_assert(ao2_ref(obj, 0) > 1);
}
ast_assert(ao2_ref(obj, 0) > 1);
return obj;
}
@ -1431,15 +1477,16 @@ static odbc_status odbc_obj_disconnect(struct odbc_obj *obj)
SQLINTEGER err;
short int mlen;
unsigned char msg[200], state[10];
SQLHDBC con;
/* Nothing to disconnect */
if (!obj->con) {
return ODBC_SUCCESS;
}
ast_mutex_lock(&obj->lock);
res = SQLDisconnect(obj->con);
con = obj->con;
obj->con = NULL;
res = SQLDisconnect(con);
if (obj->parent) {
if (res == SQL_SUCCESS || res == SQL_SUCCESS_WITH_INFO) {
@ -1449,16 +1496,14 @@ static odbc_status odbc_obj_disconnect(struct odbc_obj *obj)
}
}
if ((res = SQLFreeHandle(SQL_HANDLE_DBC, obj->con) == SQL_SUCCESS)) {
obj->con = NULL;
ast_debug(1, "Database handle deallocated\n");
if ((res = SQLFreeHandle(SQL_HANDLE_DBC, con) == SQL_SUCCESS)) {
ast_debug(1, "Database handle %p deallocated\n", con);
} else {
SQLGetDiagRec(SQL_HANDLE_DBC, obj->con, 1, state, &err, msg, 100, &mlen);
ast_log(LOG_WARNING, "Unable to deallocate database handle? %d errno=%d %s\n", res, (int)err, msg);
SQLGetDiagRec(SQL_HANDLE_DBC, con, 1, state, &err, msg, 100, &mlen);
ast_log(LOG_WARNING, "Unable to deallocate database handle %p? %d errno=%d %s\n", con, res, (int)err, msg);
}
obj->up = 0;
ast_mutex_unlock(&obj->lock);
return ODBC_SUCCESS;
}
@ -1472,40 +1517,43 @@ static odbc_status odbc_obj_connect(struct odbc_obj *obj)
SQLINTEGER enable = 1;
char *tracefile = "/tmp/odbc.trace";
#endif
ast_mutex_lock(&obj->lock);
SQLHDBC con;
if (obj->up) {
odbc_obj_disconnect(obj);
ast_log(LOG_NOTICE, "Re-connecting %s\n", obj->parent->name);
} else {
ast_assert(obj->con == NULL);
ast_log(LOG_NOTICE, "Connecting %s\n", obj->parent->name);
}
res = SQLAllocHandle(SQL_HANDLE_DBC, obj->parent->env, &obj->con);
res = SQLAllocHandle(SQL_HANDLE_DBC, obj->parent->env, &con);
if ((res != SQL_SUCCESS) && (res != SQL_SUCCESS_WITH_INFO)) {
ast_log(LOG_WARNING, "res_odbc: Error AllocHDB %d\n", res);
obj->parent->last_negative_connect = ast_tvnow();
ast_mutex_unlock(&obj->lock);
return ODBC_FAIL;
}
SQLSetConnectAttr(obj->con, SQL_LOGIN_TIMEOUT, (SQLPOINTER *)(long) obj->parent->conntimeout, 0);
SQLSetConnectAttr(obj->con, SQL_ATTR_CONNECTION_TIMEOUT, (SQLPOINTER *)(long) obj->parent->conntimeout, 0);
SQLSetConnectAttr(con, SQL_LOGIN_TIMEOUT, (SQLPOINTER *)(long) obj->parent->conntimeout, 0);
SQLSetConnectAttr(con, SQL_ATTR_CONNECTION_TIMEOUT, (SQLPOINTER *)(long) obj->parent->conntimeout, 0);
#ifdef NEEDTRACE
SQLSetConnectAttr(obj->con, SQL_ATTR_TRACE, &enable, SQL_IS_INTEGER);
SQLSetConnectAttr(obj->con, SQL_ATTR_TRACEFILE, tracefile, strlen(tracefile));
SQLSetConnectAttr(con, SQL_ATTR_TRACE, &enable, SQL_IS_INTEGER);
SQLSetConnectAttr(con, SQL_ATTR_TRACEFILE, tracefile, strlen(tracefile));
#endif
res = SQLConnect(obj->con,
res = SQLConnect(con,
(SQLCHAR *) obj->parent->dsn, SQL_NTS,
(SQLCHAR *) obj->parent->username, SQL_NTS,
(SQLCHAR *) obj->parent->password, SQL_NTS);
if ((res != SQL_SUCCESS) && (res != SQL_SUCCESS_WITH_INFO)) {
SQLGetDiagRec(SQL_HANDLE_DBC, obj->con, 1, state, &err, msg, 100, &mlen);
SQLGetDiagRec(SQL_HANDLE_DBC, con, 1, state, &err, msg, 100, &mlen);
obj->parent->last_negative_connect = ast_tvnow();
ast_mutex_unlock(&obj->lock);
ast_log(LOG_WARNING, "res_odbc: Error SQLConnect=%d errno=%d %s\n", res, (int)err, msg);
if ((res = SQLFreeHandle(SQL_HANDLE_DBC, con) != SQL_SUCCESS)) {
SQLGetDiagRec(SQL_HANDLE_DBC, con, 1, state, &err, msg, 100, &mlen);
ast_log(LOG_WARNING, "Unable to deallocate database handle %p? %d errno=%d %s\n", con, res, (int)err, msg);
}
return ODBC_FAIL;
} else {
ast_log(LOG_NOTICE, "res_odbc: Connected to %s [%s]\n", obj->parent->name, obj->parent->dsn);
@ -1513,7 +1561,7 @@ static odbc_status odbc_obj_connect(struct odbc_obj *obj)
obj->last_used = ast_tvnow();
}
ast_mutex_unlock(&obj->lock);
obj->con = con;
return ODBC_SUCCESS;
}

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