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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/
........

Merged revisions 354263 from http://svn.asterisk.org/svn/asterisk/branches/1.8
........

Merged revisions 354270 from http://svn.asterisk.org/svn/asterisk/branches/10


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@354275 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Jonathan Rose
2012-02-07 15:29:14 +00:00
parent 84642c728f
commit b08d91c3dc
1 changed files with 69 additions and 70 deletions
Download Patch File Download Diff File Expand all files Collapse all files

139
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
@@ -90,6 +90,7 @@ 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; \
} \
} \
@@ -103,6 +104,7 @@ 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; \
} \
} \
@@ -198,14 +200,10 @@ static int pgsql_log(struct ast_cdr *cdr)
struct ast_str *sql = ast_str_create(maxsize), *sql2 = ast_str_create(maxsize2);
char buf[257], escapebuf[513], *value;
int first = 1;
if (!sql || !sql2) {
if (sql) {
ast_free(sql);
}
if (sql2) {
ast_free(sql2);
}
ast_free(sql);
ast_free(sql2);
return -1;
}
@@ -336,9 +334,10 @@ 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));
@@ -414,46 +413,36 @@ 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);
ast_cli_unregister_multiple(cdr_pgsql_status_cli, ARRAY_LEN(cdr_pgsql_status_cli));
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);
ast_cli_unregister_multiple(cdr_pgsql_status_cli, ARRAY_LEN(cdr_pgsql_status_cli));
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;
}
@@ -474,9 +463,14 @@ static int config_module(int reload)
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"))) {
@@ -484,11 +478,10 @@ 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;
}
@@ -497,11 +490,10 @@ 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;
}
@@ -510,11 +502,10 @@ 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;
}
@@ -523,11 +514,10 @@ 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;
}
@@ -536,11 +526,10 @@ 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;
}
@@ -549,11 +538,10 @@ 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;
}
@@ -562,11 +550,10 @@ 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;
}
@@ -574,12 +561,12 @@ 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;
}
@@ -667,6 +654,7 @@ 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;
}
@@ -675,9 +663,13 @@ 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);
@@ -706,7 +698,9 @@ 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);
@@ -719,13 +713,18 @@ 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)
{
ast_cli_register_multiple(cdr_pgsql_status_cli, sizeof(cdr_pgsql_status_cli) / sizeof(struct ast_cli_entry));
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)