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Fix lock usage in cdr_sqlite3_custom to avoid potential crashes during reload.

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Pointed out by Russell while working on the CEL branch.


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@202417 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Sean Bright
2009-06-22 16:09:50 +00:00
parent e2bfdbac0a
commit 8d3fb80928
1 changed files with 23 additions and 30 deletions
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53
cdr/cdr_sqlite3_custom.c
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@@ -61,8 +61,6 @@ static const char name[] = "cdr_sqlite3_custom";
static sqlite3 *db = NULL;
static char table[80];
/*! XXX \bug Handling of this variable has crash potential on reload */
static char *columns;
struct values {
@@ -72,7 +70,7 @@ struct values {
static AST_LIST_HEAD_STATIC(sql_values, values);
static int free_config(void);
static void free_config(void);
static int load_column_config(const char *tmp)
{
@@ -168,11 +166,8 @@ static int load_config(int reload)
free_config();
}
ast_mutex_lock(&lock);
if (!(mappingvar = ast_variable_browse(cfg, "master"))) {
/* Nothing configured */
ast_mutex_unlock(&lock);
ast_config_destroy(cfg);
return -1;
}
@@ -187,7 +182,6 @@ static int load_config(int reload)
/* Columns */
if (load_column_config(ast_variable_retrieve(cfg, "master", "columns"))) {
ast_mutex_unlock(&lock);
ast_config_destroy(cfg);
free_config();
return -1;
@@ -195,7 +189,6 @@ static int load_config(int reload)
/* Values */
if (load_values_config(ast_variable_retrieve(cfg, "master", "values"))) {
ast_mutex_unlock(&lock);
ast_config_destroy(cfg);
free_config();
return -1;
@@ -203,18 +196,15 @@ static int load_config(int reload)
ast_verb(3, "cdr_sqlite3_custom: Logging CDR records to table '%s' in 'master.db'\n", table);
ast_mutex_unlock(&lock);
ast_config_destroy(cfg);
return 0;
}
static int free_config(void)
static void free_config(void)
{
struct values *value;
ast_mutex_lock(&lock);
if (db) {
sqlite3_close(db);
db = NULL;
@@ -228,10 +218,6 @@ static int free_config(void)
while ((value = AST_LIST_REMOVE_HEAD(&sql_values, list))) {
ast_free(value);
}
ast_mutex_unlock(&lock);
return 0;
}
static int sqlite3_log(struct ast_cdr *cdr)
@@ -246,6 +232,8 @@ static int sqlite3_log(struct ast_cdr *cdr)
return 0;
}
ast_mutex_lock(&lock);
{ /* Make it obvious that only sql should be used outside of this block */
char *escaped;
char subst_buf[2048];
@@ -257,6 +245,7 @@ static int sqlite3_log(struct ast_cdr *cdr)
if (!dummy) {
ast_log(LOG_ERROR, "Unable to allocate channel for variable subsitution.\n");
ast_free(value_string);
ast_mutex_unlock(&lock);
return 0;
}
dummy->cdr = ast_cdr_dup(cdr);
@@ -272,8 +261,6 @@ static int sqlite3_log(struct ast_cdr *cdr)
ast_free(value_string);
}
ast_mutex_lock(&lock);
/* XXX This seems awful arbitrary... */
for (count = 0; count < 5; count++) {
res = sqlite3_exec(db, sql, NULL, NULL, &error);
@@ -299,10 +286,10 @@ static int sqlite3_log(struct ast_cdr *cdr)
static int unload_module(void)
{
free_config();
ast_cdr_unregister(name);
free_config();
return 0;
}
@@ -313,14 +300,7 @@ static int load_module(void)
int res;
char *sql;
if (!load_config(0)) {
res = ast_cdr_register(name, desc, sqlite3_log);
if (res) {
ast_log(LOG_ERROR, "Unable to register custom SQLite3 CDR handling\n");
free_config();
return AST_MODULE_LOAD_DECLINE;
}
} else {
if (load_config(0)) {
return AST_MODULE_LOAD_DECLINE;
}
@@ -350,12 +330,25 @@ static int load_module(void)
}
}
return 0;
res = ast_cdr_register(name, desc, sqlite3_log);
if (res) {
ast_log(LOG_ERROR, "Unable to register custom SQLite3 CDR handling\n");
free_config();
return AST_MODULE_LOAD_DECLINE;
}
return AST_MODULE_LOAD_SUCCESS;
}
static int reload(void)
{
return load_config(1);
int res = 0;
ast_mutex_lock(&lock);
res = load_config(1);
ast_mutex_unlock(&lock);
return res;
}
AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_DEFAULT, "SQLite3 Custom CDR Module",