cel_sqlite3_custom.c File Reference

Custom SQLite3 CEL records. More...

#include "asterisk.h"
#include <sqlite3.h>
#include "asterisk/paths.h"
#include "asterisk/channel.h"
#include "asterisk/cel.h"
#include "asterisk/module.h"
#include "asterisk/config.h"
#include "asterisk/pbx.h"
#include "asterisk/logger.h"
#include "asterisk/utils.h"
#include "asterisk/cli.h"
#include "asterisk/options.h"
#include "asterisk/stringfields.h"

Include dependency graph for cel_sqlite3_custom.c:

Go to the source code of this file.

Data Structures
struct	sql_values
struct	values

Macros
#define	SQLITE_BACKEND_NAME   "CEL sqlite3 custom backend"

Functions
static void	__reg_module (void)
static void	__unreg_module (void)
struct ast_module *	AST_MODULE_SELF_SYM (void)
static void	free_config (void)
static int	load_column_config (const char *tmp)
static int	load_config (int reload)
static int	load_module (void)
static int	load_values_config (const char *tmp)
static int	reload (void)
static int	unload_module (void)
static void	write_cel (struct ast_event *event)

Variables
static struct ast_module_info	__mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_LOAD_ORDER , .description = "SQLite3 Custom CEL Module" , .key = ASTERISK_GPL_KEY , .buildopt_sum = AST_BUILDOPT_SUM, .support_level = AST_MODULE_SUPPORT_EXTENDED, .load = load_module, .unload = unload_module, .reload = reload, .load_pri = AST_MODPRI_CDR_DRIVER, .requires = "cel", }
static const struct ast_module_info *	ast_module_info = &__mod_info
static int	busy_timeout
static char *	columns
static const char	config_file [] = "cel_sqlite3_custom.conf"
static sqlite3 *	db = NULL
static ast_mutex_t	lock = AST_MUTEX_INIT_VALUE
static struct sql_values	sql_values = AST_LIST_HEAD_INIT_VALUE
static char	table [80]

Detailed Description

Custom SQLite3 CEL records.

Author

Adapted by Steve Murphy murf@.nosp@m.digi.nosp@m.um.co.nosp@m.m from Alejandro Rios aleja.nosp@m.ndro.nosp@m..rios.nosp@m.@ava.nosp@m.tar.c.nosp@m.om.c.nosp@m.o and Russell Bryant russe.nosp@m.ll@d.nosp@m.igium.nosp@m..com from cdr_mysql_custom by Edward Eastman ed@dm.nosp@m.3.co.nosp@m..uk, and cdr_sqlite by Holger Schurig hs423.nosp@m.3@ma.nosp@m.il.mn.nosp@m.-sol.nosp@m.ution.nosp@m.s.de

Definition in file cel_sqlite3_custom.c.

Macro Definition Documentation

SQLITE_BACKEND_NAME

#define SQLITE_BACKEND_NAME   "CEL sqlite3 custom backend"

Definition at line 53 of file cel_sqlite3_custom.c.

Function Documentation

__reg_module()

static void __reg_module ( void  )

static

Definition at line 359 of file cel_sqlite3_custom.c.

__unreg_module()

static void __unreg_module ( void  )

static

Definition at line 359 of file cel_sqlite3_custom.c.

AST_MODULE_SELF_SYM()

struct ast_module * AST_MODULE_SELF_SYM

(

void

)

Definition at line 359 of file cel_sqlite3_custom.c.

free_config()

static void free_config ( void  )

static

Definition at line 216 of file cel_sqlite3_custom.c.

{
    struct values *value;
 
    if (db) {
        sqlite3_close(db);
        db = NULL;
    }
 
    if (columns) {
        ast_free(columns);
        columns = NULL;
    }
 
    while ((value = AST_LIST_REMOVE_HEAD(&sql_values, list))) {
        ast_free(value);
    }
}

References ast_free, AST_LIST_REMOVE_HEAD, db, values::list, NULL, and value.

Referenced by load_config(), load_module(), and unload_module().

load_column_config()

static int load_column_config ( const char *  tmp )

static

Definition at line 77 of file cel_sqlite3_custom.c.

{
    char *col = NULL;
    char *cols = NULL, *save = NULL;
    char *escaped = NULL;
    struct ast_str *column_string = NULL;
 
    if (ast_strlen_zero(tmp)) {
        ast_log(LOG_WARNING, "Column names not specified. Module not loaded.\n");
        return -1;
    }
    if (!(column_string = ast_str_create(1024))) {
        ast_log(LOG_ERROR, "Out of memory creating temporary buffer for column list for table '%s.'\n", table);
        return -1;
    }
    if (!(save = cols = ast_strdup(tmp))) {
        ast_log(LOG_ERROR, "Out of memory creating temporary buffer for column list for table '%s.'\n", table);
        ast_free(column_string);
        return -1;
    }
    while ((col = strsep(&cols, ","))) {
        col = ast_strip(col);
        escaped = sqlite3_mprintf("%q", col);
        if (!escaped) {
            ast_log(LOG_ERROR, "Out of memory creating entry for column '%s' in table '%s.'\n", col, table);
            ast_free(column_string);
            ast_free(save);
            return -1;
        }
        ast_str_append(&column_string, 0, "%s%s", ast_str_strlen(column_string) ? "," : "", escaped);
        sqlite3_free(escaped);
    }
    if (!(columns = ast_strdup(ast_str_buffer(column_string)))) {
        ast_log(LOG_ERROR, "Out of memory copying columns string for table '%s.'\n", table);
        ast_free(column_string);
        ast_free(save);
        return -1;
    }
    ast_free(column_string);
    ast_free(save);
 
    return 0;
}

References ast_free, ast_log, ast_str_append(), ast_str_buffer(), ast_str_create, ast_str_strlen(), ast_strdup, ast_strip(), ast_strlen_zero(), LOG_ERROR, LOG_WARNING, NULL, strsep(), and table.

Referenced by load_config().

load_config()

static int load_config ( int  reload )

static

Definition at line 153 of file cel_sqlite3_custom.c.

{
    struct ast_config *cfg;
    struct ast_flags config_flags = { reload ? CONFIG_FLAG_FILEUNCHANGED : 0 };
    struct ast_variable *mappingvar;
    const char *tmp;
 
    if ((cfg = ast_config_load(config_file, config_flags)) == CONFIG_STATUS_FILEMISSING || cfg == CONFIG_STATUS_FILEINVALID) {
        ast_log(LOG_WARNING, "Failed to %sload configuration file. %s\n",
            reload ? "re" : "", reload ? "" : "Module not activated.");
        return -1;
    } else if (cfg == CONFIG_STATUS_FILEUNCHANGED) {
        return 0;
    }
 
    if (reload) {
        free_config();
    }
 
    if (!(mappingvar = ast_variable_browse(cfg, "master"))) {
        /* Nothing configured */
        ast_config_destroy(cfg);
        return -1;
    }
 
    /* Mapping must have a table name */
    if (!ast_strlen_zero(tmp = ast_variable_retrieve(cfg, "master", "table"))) {
        ast_copy_string(table, tmp, sizeof(table));
    } else {
        ast_log(LOG_WARNING, "Table name not specified.  Assuming cel.\n");
        strcpy(table, "cel");
    }
 
    /* sqlite3_busy_timeout in miliseconds */
    if ((tmp = ast_variable_retrieve(cfg, "master", "busy_timeout")) != NULL) {
        if (ast_parse_arg(tmp, PARSE_INT32|PARSE_DEFAULT, &busy_timeout, 1000) != 0) {
            ast_log(LOG_WARNING, "Invalid busy_timeout value '%s' specified. Using 1000 instead.\n", tmp);
        }
    } else {
        busy_timeout = 1000;
    }
 
    /* Columns */
    if (load_column_config(ast_variable_retrieve(cfg, "master", "columns"))) {
        ast_config_destroy(cfg);
        free_config();
        return -1;
    }
 
    /* Values */
    if (load_values_config(ast_variable_retrieve(cfg, "master", "values"))) {
        ast_config_destroy(cfg);
        free_config();
        return -1;
    }
 
    ast_verb(3, "Logging CEL records to table '%s' in 'master.db'\n", table);
 
    ast_config_destroy(cfg);
 
    return 0;
}

References ast_config_destroy(), ast_config_load, ast_copy_string(), ast_log, ast_parse_arg(), ast_strlen_zero(), ast_variable_browse(), ast_variable_retrieve(), ast_verb, busy_timeout, config_file, CONFIG_FLAG_FILEUNCHANGED, CONFIG_STATUS_FILEINVALID, CONFIG_STATUS_FILEMISSING, CONFIG_STATUS_FILEUNCHANGED, free_config(), load_column_config(), load_values_config(), LOG_WARNING, NULL, PARSE_DEFAULT, PARSE_INT32, reload(), and table.

load_module()

static int load_module ( void  )

static

Definition at line 295 of file cel_sqlite3_custom.c.

{
    char *error;
    char filename[PATH_MAX];
    int res;
    char *sql;
 
    if (load_config(0)) {
        return AST_MODULE_LOAD_DECLINE;
    }
 
    /* is the database there? */
    snprintf(filename, sizeof(filename), "%s/master.db", ast_config_AST_LOG_DIR);
    res = sqlite3_open(filename, &db);
    if (res != SQLITE_OK) {
        ast_log(LOG_ERROR, "Could not open database %s.\n", filename);
        free_config();
        return AST_MODULE_LOAD_DECLINE;
    }
    sqlite3_busy_timeout(db, busy_timeout);
    /* is the table there? */
    sql = sqlite3_mprintf("SELECT COUNT(*) FROM %q;", table);
    res = sqlite3_exec(db, sql, NULL, NULL, NULL);
    sqlite3_free(sql);
    if (res != SQLITE_OK) {
        /* We don't use %q for the column list here since we already escaped when building it */
        sql = sqlite3_mprintf("CREATE TABLE %q (AcctId INTEGER PRIMARY KEY, %s)", table, columns);
        res = sqlite3_exec(db, sql, NULL, NULL, &error);
        sqlite3_free(sql);
        if (res != SQLITE_OK) {
            ast_log(LOG_WARNING, "Unable to create table '%s': %s.\n", table, error);
            sqlite3_free(error);
            free_config();
            return AST_MODULE_LOAD_DECLINE;
        }
    }
 
    if (ast_cel_backend_register(SQLITE_BACKEND_NAME, write_cel)) {
        ast_log(LOG_ERROR, "Unable to register custom SQLite3 CEL handling\n");
        free_config();
        return AST_MODULE_LOAD_DECLINE;
    }
 
    return AST_MODULE_LOAD_SUCCESS;
}

References ast_cel_backend_register(), ast_config_AST_LOG_DIR, ast_log, AST_MODULE_LOAD_DECLINE, AST_MODULE_LOAD_SUCCESS, busy_timeout, db, error(), free_config(), load_config(), LOG_ERROR, LOG_WARNING, NULL, PATH_MAX, SQLITE_BACKEND_NAME, table, and write_cel().

load_values_config()

static int load_values_config ( const char *  tmp )

static

Definition at line 121 of file cel_sqlite3_custom.c.

{
    char *val = NULL;
    char *vals = NULL, *save = NULL;
    struct values *value = NULL;
 
    if (ast_strlen_zero(tmp)) {
        ast_log(LOG_WARNING, "Values not specified. Module not loaded.\n");
        return -1;
    }
    if (!(save = vals = ast_strdup(tmp))) {
        ast_log(LOG_ERROR, "Out of memory creating temporary buffer for value '%s'\n", tmp);
        return -1;
    }
    while ((val = strsep(&vals, ","))) {
        /* Strip the single quotes off if they are there */
        val = ast_strip_quoted(val, "'", "'");
        value = ast_calloc(sizeof(char), sizeof(*value) + strlen(val) + 1);
        if (!value) {
            ast_log(LOG_ERROR, "Out of memory creating entry for value '%s'\n", val);
            ast_free(save);
            return -1;
        }
        value->expression = (char *) value + sizeof(*value);
        ast_copy_string(value->expression, val, strlen(val) + 1);
        AST_LIST_INSERT_TAIL(&sql_values, value, list);
    }
    ast_free(save);
 
    return 0;
}

References ast_calloc, ast_copy_string(), ast_free, AST_LIST_INSERT_TAIL, ast_log, ast_strdup, ast_strip_quoted(), ast_strlen_zero(), values::list, LOG_ERROR, LOG_WARNING, NULL, strsep(), and value.

Referenced by load_config().

reload()

static int reload ( void  )

static

Definition at line 341 of file cel_sqlite3_custom.c.

{
    int res = 0;
 
    ast_mutex_lock(&lock);
    res = load_config(1);
    ast_mutex_unlock(&lock);
 
    return res;
}

References ast_mutex_lock, ast_mutex_unlock, load_config(), and lock.

Referenced by load_config().

unload_module()

static int unload_module ( void  )

static

Definition at line 286 of file cel_sqlite3_custom.c.

{
    ast_cel_backend_unregister(SQLITE_BACKEND_NAME);
 
    free_config();
 
    return 0;
}

References ast_cel_backend_unregister(), free_config(), and SQLITE_BACKEND_NAME.

write_cel()

static void write_cel ( struct ast_event *  event )

static

Definition at line 235 of file cel_sqlite3_custom.c.

{
    char *error = NULL;
    char *sql = NULL;
 
    if (db == NULL) {
        /* Should not have loaded, but be failsafe. */
        return;
    }
 
    ast_mutex_lock(&lock);
 
    { /* Make it obvious that only sql should be used outside of this block */
        char *escaped;
        char subst_buf[2048];
        struct values *value;
        struct ast_channel *dummy;
        struct ast_str *value_string = ast_str_create(1024);
 
        dummy = ast_cel_fabricate_channel_from_event(event);
        if (!dummy) {
            ast_log(LOG_ERROR, "Unable to fabricate channel from CEL event.\n");
            ast_free(value_string);
            ast_mutex_unlock(&lock);
            return;
        }
        AST_LIST_TRAVERSE(&sql_values, value, list) {
            pbx_substitute_variables_helper(dummy, value->expression, subst_buf, sizeof(subst_buf) - 1);
            escaped = sqlite3_mprintf("%q", subst_buf);
            ast_str_append(&value_string, 0, "%s'%s'", ast_str_strlen(value_string) ? "," : "", escaped);
            sqlite3_free(escaped);
        }
        sql = sqlite3_mprintf("INSERT INTO %q (%s) VALUES (%s)", table, columns, ast_str_buffer(value_string));
        ast_debug(1, "About to log: %s\n", sql);
        dummy = ast_channel_unref(dummy);
        ast_free(value_string);
    }
 
    if (sqlite3_exec(db, sql, NULL, NULL, &error) != SQLITE_OK) {
        ast_log(LOG_ERROR, "%s. SQL: %s.\n", error, sql);
        sqlite3_free(error);
    }
 
    if (sql) {
        sqlite3_free(sql);
    }
    ast_mutex_unlock(&lock);
 
    return;
}

References ast_cel_fabricate_channel_from_event(), ast_channel_unref, ast_debug, ast_free, AST_LIST_TRAVERSE, ast_log, ast_mutex_lock, ast_mutex_unlock, ast_str_append(), ast_str_buffer(), ast_str_create, ast_str_strlen(), db, dummy(), error(), lock, LOG_ERROR, NULL, pbx_substitute_variables_helper(), table, and value.

Referenced by load_module().

Variable Documentation

__mod_info

struct ast_module_info __mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_LOAD_ORDER , .description = "SQLite3 Custom CEL Module" , .key = ASTERISK_GPL_KEY , .buildopt_sum = AST_BUILDOPT_SUM, .support_level = AST_MODULE_SUPPORT_EXTENDED, .load = load_module, .unload = unload_module, .reload = reload, .load_pri = AST_MODPRI_CDR_DRIVER, .requires = "cel", }

static

Definition at line 359 of file cel_sqlite3_custom.c.

ast_module_info

const struct ast_module_info* ast_module_info = &__mod_info

static

Definition at line 359 of file cel_sqlite3_custom.c.

busy_timeout

int busy_timeout

static

Definition at line 66 of file cel_sqlite3_custom.c.

Referenced by load_config(), and load_module().

columns

char* columns

static

Bug:

Handling of this var is crash prone on reloads

Definition at line 65 of file cel_sqlite3_custom.c.

config_file

const char config_file[] = "cel_sqlite3_custom.conf"

static

Definition at line 57 of file cel_sqlite3_custom.c.

Referenced by load_config().

db

sqlite3* db = NULL

static

Definition at line 59 of file cel_sqlite3_custom.c.

Referenced by free_config(), load_module(), and write_cel().

lock

ast_mutex_t lock = AST_MUTEX_INIT_VALUE

static

Definition at line 55 of file cel_sqlite3_custom.c.

Referenced by reload(), and write_cel().

sql_values

struct sql_values sql_values = AST_LIST_HEAD_INIT_VALUE

static

table

char table[80]

static

Definition at line 61 of file cel_sqlite3_custom.c.

Referenced by load_column_config(), load_config(), load_module(), and write_cel().