src/auth/userdb-sql.c

	userdb-sql.c revision 66d2db642fe24d555d113ba463e446b038d476ef
/* Copyright (C) 2004 Timo Sirainen, Alex Howansky */

#include "config.h"
#undef HAVE_CONFIG_H

#ifdef USERDB_SQL

#include "common.h"
#include "str.h"
#include "strescape.h"
#include "var-expand.h"
#include "db-sql.h"
#include "userdb.h"

#include <stdlib.h>
#include <string.h>

struct userdb_sql_request {
    struct auth_request *auth_request;
    userdb_callback_t *callback;
};

extern struct userdb_module userdb_sql;

static struct sql_connection *userdb_sql_conn;

static const char *sql_query_get_result(struct sql_result *result,
                    struct auth_request *auth_request)
{
    string_t *str;
    uid_t uid, gid;
    const char *name, *value;
    unsigned int i, fields_count;

    uid = (uid_t)-1;
    gid = (gid_t)-1;

    str = t_str_new(256);
    str_append(str, auth_request->user);

    fields_count = sql_result_get_fields_count(result);
    for (i = 0; i < fields_count; i++) {
        name = sql_result_get_field_name(result, i);
        value = sql_result_get_field_value(result, i);

        if (value == NULL)
            continue;

        str_append_c(str, '\t');
        str_append(str, name);
        str_append_c(str, '=');

        /* some special handling for UID and GID. */
        if (strcmp(name, "uid") == 0) {
            uid = userdb_parse_uid(auth_request, value);
            if (uid == (uid_t)-1)
                return NULL;
            value = dec2str(uid);
        } else if (strcmp(name, "gid") == 0) {
            gid = userdb_parse_gid(auth_request, value);
            if (gid == (gid_t)-1)
                return NULL;
            value = dec2str(gid);
        }

        str_append(str, value);
    }

    if (uid == (uid_t)-1) {
        auth_request_log_error(auth_request, "sql",
            "Password query didn't return uid, or it was NULL");
    }
    if (gid == (gid_t)-1) {
        auth_request_log_error(auth_request, "sql",
            "Password query didn't return gid, or it was NULL");
    }

    return str_c(str);
}

static void sql_query_callback(struct sql_result *result, void *context)
{
    struct userdb_sql_request *sql_request = context;
    struct auth_request *auth_request = sql_request->auth_request;
    const char *user_result = NULL;
    int ret;

    ret = sql_result_next_row(result);
    if (ret < 0) {
        auth_request_log_error(auth_request, "sql",
            "User query failed: %s", sql_result_get_error(result));
    } else if (ret == 0) {
        auth_request_log_info(auth_request, "sql", "User not found");
    } else {
                user_result = sql_query_get_result(result, auth_request);
    }

    sql_request->callback(user_result, auth_request);
    i_free(sql_request);
}

static void userdb_sql_lookup(struct auth_request *auth_request,
                  userdb_callback_t *callback)
{
    struct userdb_sql_request *sql_request;
    string_t *query;

    query = t_str_new(512);
    var_expand(query, userdb_sql_conn->set.user_query,
           auth_request_get_var_expand_table(auth_request,
                             str_escape));

    sql_request = i_new(struct userdb_sql_request, 1);
    sql_request->callback = callback;
    sql_request->auth_request = auth_request;

    auth_request_log_debug(auth_request, "sql", "%s", str_c(query));

    sql_query(userdb_sql_conn->db, str_c(query),
          sql_query_callback, sql_request);
}

static void userdb_sql_preinit(const char *args)
{
    userdb_sql_conn = db_sql_init(args);
}

static void userdb_sql_init(const char *args __attr_unused__)
{
    enum sql_db_flags flags;

    db_sql_connect(userdb_sql_conn);

    flags = sql_get_flags(userdb_sql_conn->db);
    userdb_sql.blocking = (flags & SQL_DB_FLAG_BLOCKING) != 0;
}

static void userdb_sql_deinit(void)
{
    db_sql_unref(userdb_sql_conn);
}

struct userdb_module userdb_sql = {
    "sql",
    FALSE,

    userdb_sql_preinit,
    userdb_sql_init,
    userdb_sql_deinit,

    userdb_sql_lookup
};

#endif