src/auth/db-sql.c

	db-sql.c revision 2e37d45867d081db150ab78dad303b9077aea24f
/* Copyright (c) 2003-2011 Dovecot authors, see the included COPYING file */

#include "auth-common.h"

#if defined(PASSDB_SQL) || defined(USERDB_SQL)

#include "settings.h"
#include "auth-request.h"
#include "db-sql.h"

#include <stddef.h>
#include <stdlib.h>

#define DEF_STR(name) DEF_STRUCT_STR(name, sql_settings)
#define DEF_INT(name) DEF_STRUCT_INT(name, sql_settings)
#define DEF_BOOL(name) DEF_STRUCT_BOOL(name, sql_settings)

static struct setting_def setting_defs[] = {
    DEF_STR(driver),
    DEF_STR(connect),
    DEF_STR(password_query),
    DEF_STR(user_query),
    DEF_STR(update_query),
    DEF_STR(iterate_query),
    DEF_STR(default_pass_scheme),

    { 0, NULL, 0 }
};

static struct sql_settings default_sql_settings = {
    .driver = NULL,
    .connect = NULL,
    .password_query = "SELECT username, domain, password FROM users WHERE username = '%n' AND domain = '%d'",
    .user_query = "SELECT home, uid, gid FROM users WHERE username = '%n' AND domain = '%d'",
    .update_query = "UPDATE users SET password = '%w' WHERE username = '%n' AND domain = '%d'",
    .iterate_query = "SELECT username, domain FROM users",
    .default_pass_scheme = "MD5"
};

static struct sql_connection *connections = NULL;

static struct sql_connection *sql_conn_find(const char *config_path)
{
    struct sql_connection *conn;

    for (conn = connections; conn != NULL; conn = conn->next) {
        if (strcmp(conn->config_path, config_path) == 0)
            return conn;
    }

    return NULL;
}

static const char *parse_setting(const char *key, const char *value,
                 struct sql_connection *conn)
{
    return parse_setting_from_defs(conn->pool, setting_defs,
                       &conn->set, key, value);
}

struct sql_connection *db_sql_init(const char *config_path)
{
    struct sql_connection *conn;
    pool_t pool;

    conn = sql_conn_find(config_path);
    if (conn != NULL) {
        conn->refcount++;
        return conn;
    }

    if (*config_path == '\0')
        i_fatal("sql: Configuration file path not given");

    pool = pool_alloconly_create("sql_connection", 1024);
    conn = p_new(pool, struct sql_connection, 1);
    conn->pool = pool;

    conn->refcount = 1;

    conn->config_path = p_strdup(pool, config_path);
    conn->set = default_sql_settings;
    if (!settings_read(config_path, NULL, parse_setting,
               null_settings_section_callback, conn))
        exit(FATAL_DEFAULT);

    if (conn->set.password_query == default_sql_settings.password_query)
        conn->default_password_query = TRUE;
    if (conn->set.user_query == default_sql_settings.user_query)
        conn->default_user_query = TRUE;
    if (conn->set.update_query == default_sql_settings.update_query)
        conn->default_update_query = TRUE;
    if (conn->set.iterate_query == default_sql_settings.iterate_query)
        conn->default_iterate_query = TRUE;

    if (conn->set.driver == NULL) {
        i_fatal("sql: driver not set in configuration file %s",
            config_path);
    }
    if (conn->set.connect == NULL) {
        i_fatal("sql: connect string not set in configuration file %s",
            config_path);
    }
    conn->db = sql_init(conn->set.driver, conn->set.connect);

    conn->next = connections;
    connections = conn;
    return conn;
}

void db_sql_unref(struct sql_connection **_conn)
{
        struct sql_connection *conn = *_conn;

    /* abort all pending auth requests before setting conn to NULL,
       so that callbacks can still access it */
    sql_disconnect(conn->db);

    *_conn = NULL;
    if (--conn->refcount > 0)
        return;

    sql_deinit(&conn->db);
    pool_unref(&conn->pool);
}

#endif