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Fix column duplication bug in module reload for cdr_pgsql.

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Prior to this patch, attempts to reload cdr_pgsql.so would cause the column list to keep
its current data and then add a second copy during the reload. This would cause attempts
to log the CDR to the database to fail. This patch also cleans up some unnecessary null
checks for ast_free and deals with a few potential locking problems.

(closes issue ASTERISK-19216)
Reported by: Jacek Konieczny
Review: https://reviewboard.asterisk.org/r/1711/


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.8@354263 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Jonathan Rose
2012-02-07 15:04:38 +00:00
parent 2997c5c8c6
commit ff07b89e63
1 changed files with 70 additions and 64 deletions
Download Patch File Download Diff File Expand all files Collapse all files

132
cdr/cdr_pgsql.c
View File

@@ -1,7 +1,7 @@
/*
* Asterisk -- An open source telephony toolkit.
*
* Copyright (C) 2003 - 2006
* Copyright (C) 2003 - 2012
*
* Matthew D. Hardeman <mhardemn@papersoft.com>
* Adapted from the MySQL CDR logger originally by James Sharp
@@ -81,6 +81,7 @@ static AST_RWLIST_HEAD_STATIC(psql_columns, columns);
ast_free(sql); \
ast_free(sql2); \
AST_RWLIST_UNLOCK(&psql_columns); \
ast_mutex_unlock(&pgsql_lock); \
return -1; \
} \
} \
@@ -94,6 +95,7 @@ static AST_RWLIST_HEAD_STATIC(psql_columns, columns);
ast_free(sql); \
ast_free(sql2); \
AST_RWLIST_UNLOCK(&psql_columns); \
ast_mutex_unlock(&pgsql_lock); \
return -1; \
} \
} \
@@ -134,12 +136,8 @@ static int pgsql_log(struct ast_cdr *cdr)
int first = 1;
if (!sql || !sql2) {
if (sql) {
ast_free(sql);
}
if (sql2) {
ast_free(sql2);
}
ast_free(sql);
ast_free(sql2);
return -1;
}
@@ -270,9 +268,10 @@ static int pgsql_log(struct ast_cdr *cdr)
}
}
first = 0;
}
AST_RWLIST_UNLOCK(&psql_columns);
}
LENGTHEN_BUF1(ast_str_strlen(sql2) + 2);
AST_RWLIST_UNLOCK(&psql_columns);
ast_str_append(&sql, 0, ")%s)", ast_str_buffer(sql2));
ast_verb(11, "[%s]\n", ast_str_buffer(sql));
@@ -334,45 +333,35 @@ static int pgsql_log(struct ast_cdr *cdr)
return 0;
}
static int unload_module(void)
/* This function should be called without holding the pgsql_columns lock */
static void empty_columns(void)
{
struct columns *current;
ast_cdr_unregister(name);
PQfinish(conn);
if (pghostname) {
ast_free(pghostname);
}
if (pgdbname) {
ast_free(pgdbname);
}
if (pgdbuser) {
ast_free(pgdbuser);
}
if (pgpassword) {
ast_free(pgpassword);
}
if (pgdbport) {
ast_free(pgdbport);
}
if (table) {
ast_free(table);
}
if (encoding) {
ast_free(encoding);
}
if (tz) {
ast_free(tz);
}
AST_RWLIST_WRLOCK(&psql_columns);
while ((current = AST_RWLIST_REMOVE_HEAD(&psql_columns, list))) {
ast_free(current);
}
AST_RWLIST_UNLOCK(&psql_columns);
}
static int unload_module(void)
{
ast_cdr_unregister(name);
PQfinish(conn);
ast_free(pghostname);
ast_free(pgdbname);
ast_free(pgdbuser);
ast_free(pgpassword);
ast_free(pgdbport);
ast_free(table);
ast_free(encoding);
ast_free(tz);
empty_columns();
return 0;
}
@@ -389,12 +378,18 @@ static int config_module(int reload)
if ((cfg = ast_config_load(config, config_flags)) == NULL || cfg == CONFIG_STATUS_FILEINVALID) {
ast_log(LOG_WARNING, "Unable to load config for PostgreSQL CDR's: %s\n", config);
return -1;
} else if (cfg == CONFIG_STATUS_FILEUNCHANGED)
} else if (cfg == CONFIG_STATUS_FILEUNCHANGED) {
return 0;
}
ast_mutex_lock(&pgsql_lock);
if (!(var = ast_variable_browse(cfg, "global"))) {
ast_config_destroy(cfg);
return 0;
ast_mutex_unlock(&pgsql_lock);
ast_log(LOG_NOTICE, "cdr_pgsql configuration contains no global section, skipping module %s.\n",
reload ? "reload" : "load");
return -1;
}
if (!(tmp = ast_variable_retrieve(cfg, "global", "hostname"))) {
@@ -402,10 +397,10 @@ static int config_module(int reload)
tmp = ""; /* connect via UNIX-socket by default */
}
if (pghostname)
ast_free(pghostname);
ast_free(pghostname);
if (!(pghostname = ast_strdup(tmp))) {
ast_config_destroy(cfg);
ast_mutex_unlock(&pgsql_lock);
return -1;
}
@@ -414,10 +409,10 @@ static int config_module(int reload)
tmp = "asteriskcdrdb";
}
if (pgdbname)
ast_free(pgdbname);
ast_free(pgdbname);
if (!(pgdbname = ast_strdup(tmp))) {
ast_config_destroy(cfg);
ast_mutex_unlock(&pgsql_lock);
return -1;
}
@@ -426,10 +421,10 @@ static int config_module(int reload)
tmp = "asterisk";
}
if (pgdbuser)
ast_free(pgdbuser);
ast_free(pgdbuser);
if (!(pgdbuser = ast_strdup(tmp))) {
ast_config_destroy(cfg);
ast_mutex_unlock(&pgsql_lock);
return -1;
}
@@ -438,10 +433,10 @@ static int config_module(int reload)
tmp = "";
}
if (pgpassword)
ast_free(pgpassword);
ast_free(pgpassword);
if (!(pgpassword = ast_strdup(tmp))) {
ast_config_destroy(cfg);
ast_mutex_unlock(&pgsql_lock);
return -1;
}
@@ -450,10 +445,10 @@ static int config_module(int reload)
tmp = "5432";
}
if (pgdbport)
ast_free(pgdbport);
ast_free(pgdbport);
if (!(pgdbport = ast_strdup(tmp))) {
ast_config_destroy(cfg);
ast_mutex_unlock(&pgsql_lock);
return -1;
}
@@ -462,10 +457,10 @@ static int config_module(int reload)
tmp = "cdr";
}
if (table)
ast_free(table);
ast_free(table);
if (!(table = ast_strdup(tmp))) {
ast_config_destroy(cfg);
ast_mutex_unlock(&pgsql_lock);
return -1;
}
@@ -474,11 +469,10 @@ static int config_module(int reload)
tmp = "LATIN9";
}
if (encoding) {
ast_free(encoding);
}
ast_free(encoding);
if (!(encoding = ast_strdup(tmp))) {
ast_config_destroy(cfg);
ast_mutex_unlock(&pgsql_lock);
return -1;
}
@@ -486,12 +480,12 @@ static int config_module(int reload)
tmp = "";
}
if (tz) {
ast_free(tz);
tz = NULL;
}
ast_free(tz);
tz = NULL;
if (!ast_strlen_zero(tmp) && !(tz = ast_strdup(tmp))) {
ast_config_destroy(cfg);
ast_mutex_unlock(&pgsql_lock);
return -1;
}
@@ -577,6 +571,7 @@ static int config_module(int reload)
ast_log(LOG_ERROR, "Failed to query database columns: %s\n", pgerror);
PQclear(result);
unload_module();
ast_mutex_unlock(&pgsql_lock);
return AST_MODULE_LOAD_DECLINE;
}
@@ -585,9 +580,13 @@ static int config_module(int reload)
ast_log(LOG_ERROR, "cdr_pgsql: Failed to query database columns. No columns found, does the table exist?\n");
PQclear(result);
unload_module();
ast_mutex_unlock(&pgsql_lock);
return AST_MODULE_LOAD_DECLINE;
}
/* Clear out the columns list. */
empty_columns();
for (i = 0; i < rows; i++) {
fname = PQgetvalue(result, i, 0);
ftype = PQgetvalue(result, i, 1);
@@ -616,7 +615,9 @@ static int config_module(int reload)
} else {
cur->hasdefault = 0;
}
AST_RWLIST_WRLOCK(&psql_columns);
AST_RWLIST_INSERT_TAIL(&psql_columns, cur, list);
AST_RWLIST_UNLOCK(&psql_columns);
}
}
PQclear(result);
@@ -629,12 +630,17 @@ static int config_module(int reload)
ast_config_destroy(cfg);
return ast_cdr_register(name, ast_module_info->description, pgsql_log);
ast_mutex_unlock(&pgsql_lock);
return 0;
}
static int load_module(void)
{
return config_module(0) ? AST_MODULE_LOAD_DECLINE : 0;
if (config_module(0)) {
return AST_MODULE_LOAD_DECLINE;
}
return ast_cdr_register(name, ast_module_info->description, pgsql_log)
? AST_MODULE_LOAD_DECLINE : 0;
}
static int reload(void)