src/director/main.c

	main.c revision c3a2a487e23a282e59254b82deb9344ed0306bb2
/* Copyright (c) 2010-2016 Dovecot authors, see the included COPYING file */

#include "lib.h"
#include "ioloop.h"
#include "array.h"
#include "str.h"
#include "restrict-access.h"
#include "process-title.h"
#include "master-interface.h"
#include "master-service.h"
#include "master-service-settings.h"
#include "auth-connection.h"
#include "doveadm-connection.h"
#include "login-connection.h"
#include "notify-connection.h"
#include "user-directory.h"
#include "director.h"
#include "director-host.h"
#include "director-connection.h"
#include "director-request.h"
#include "mail-host.h"

#include <stdio.h>
#include <unistd.h>

#define AUTH_SOCKET_PATH "auth-login"
#define AUTH_USERDB_SOCKET_PATH "auth-userdb"

enum director_socket_type {
    DIRECTOR_SOCKET_TYPE_UNKNOWN = 0,
    DIRECTOR_SOCKET_TYPE_AUTH,
    DIRECTOR_SOCKET_TYPE_USERDB,
    DIRECTOR_SOCKET_TYPE_AUTHREPLY,
    DIRECTOR_SOCKET_TYPE_RING,
    DIRECTOR_SOCKET_TYPE_DOVEADM
};

static struct director *director;
static struct notify_connection *notify_conn;
static struct timeout *to_proctitle_refresh;
static ARRAY(enum director_socket_type) listener_socket_types;

static void director_refresh_proctitle_timeout(void *context ATTR_UNUSED)
{
    static uint64_t prev_requests = 0, prev_input = 0, prev_output;
    string_t *str;

    str = t_str_new(64);
    str_printfa(str, "[%u users", user_directory_count(director->users));
    str_printfa(str, ", %lu req/s",
            (unsigned long)(director->num_requests - prev_requests));
    str_printfa(str, ", %llu+%llu kB/s",
            (unsigned long long)(director->ring_traffic_input - prev_input)/1024,
            (unsigned long long)(director->ring_traffic_output - prev_output)/1024);
    str_append_c(str, ']');

    prev_requests = director->num_requests;
    prev_input = director->ring_traffic_input;
    prev_output = director->ring_traffic_output;

    process_title_set(str_c(str));
}

static enum director_socket_type
director_socket_type_get_from_name(const char *path)
{
    const char *name, *suffix;

    name = strrchr(path, '/');
    if (name == NULL)
        name = path;
    else
        name++;

    suffix = strrchr(name, '-');
    if (suffix == NULL)
        suffix = name;
    else
        suffix++;

    if (strcmp(suffix, "auth") == 0)
        return DIRECTOR_SOCKET_TYPE_AUTH;
    else if (strcmp(suffix, "userdb") == 0)
        return DIRECTOR_SOCKET_TYPE_USERDB;
    else if (strcmp(suffix, "authreply") == 0)
        return DIRECTOR_SOCKET_TYPE_AUTHREPLY;
    else if (strcmp(suffix, "ring") == 0)
        return DIRECTOR_SOCKET_TYPE_RING;
    else if (strcmp(suffix, "admin") == 0 ||
         strcmp(suffix, "doveadm") == 0)
        return DIRECTOR_SOCKET_TYPE_DOVEADM;
    else
        return DIRECTOR_SOCKET_TYPE_UNKNOWN;
}

static enum director_socket_type
listener_get_socket_type_fallback(int listen_fd)
{
    in_port_t local_port;

    if (net_getsockname(listen_fd, NULL, &local_port) == 0 &&
        local_port != 0) {
        /* TCP/IP connection */
        return DIRECTOR_SOCKET_TYPE_RING;
    }
    return DIRECTOR_SOCKET_TYPE_AUTH;
}

static void listener_sockets_init(struct ip_addr *listen_ip_r,
                  in_port_t *listen_port_r)
{
    const char *name;
    unsigned int i, socket_count;
    struct ip_addr ip;
    in_port_t port;
    enum director_socket_type type;

    *listen_port_r = 0;

    i_array_init(&listener_socket_types, 8);
    socket_count = master_service_get_socket_count(master_service);
    for (i = 0; i < socket_count; i++) {
        int listen_fd = MASTER_LISTEN_FD_FIRST + i;

        name = master_service_get_socket_name(master_service, listen_fd);
        type = director_socket_type_get_from_name(name);
        if (type == DIRECTOR_SOCKET_TYPE_UNKNOWN) {
            /* mainly for backwards compatibility */
            type = listener_get_socket_type_fallback(listen_fd);
        }
        if (type == DIRECTOR_SOCKET_TYPE_RING && *listen_port_r == 0 &&
            net_getsockname(listen_fd, &ip, &port) == 0 && port > 0) {
            *listen_ip_r = ip;
            *listen_port_r = port;
        }
        array_idx_set(&listener_socket_types, listen_fd, &type);
    }
}

static int director_client_connected(int fd, const struct ip_addr *ip)
{
    struct director_host *host;

    host = director_host_lookup_ip(director, ip);
    if (host == NULL || host->removed) {
        i_warning("Connection from %s: Server not listed in "
              "director_servers, dropping", net_ip2addr(ip));
        return -1;
    }

    (void)director_connection_init_in(director, fd, ip);
    return 0;
}

static void client_connected(struct master_service_connection *conn)
{
    struct auth_connection *auth;
    const char *socket_path;
    const enum director_socket_type *typep;
    bool userdb;

    if (conn->fifo) {
        if (notify_conn != NULL) {
            i_error("Received another proxy-notify connection");
            return;
        }
        master_service_client_connection_accept(conn);
        notify_conn = notify_connection_init(director, conn->fd);
        return;
    }

    typep = array_idx(&listener_socket_types, conn->listen_fd);
    switch (*typep) {
    case DIRECTOR_SOCKET_TYPE_UNKNOWN:
        i_unreached();
    case DIRECTOR_SOCKET_TYPE_AUTH:
    case DIRECTOR_SOCKET_TYPE_USERDB:
        /* a) userdb connection, probably for lmtp proxy
           b) login connection
           Both of them are handled exactly the same, except for which
           auth socket they connect to. */
        userdb = *typep == DIRECTOR_SOCKET_TYPE_USERDB;
        socket_path = userdb ? AUTH_USERDB_SOCKET_PATH :
            AUTH_SOCKET_PATH;
        auth = auth_connection_init(socket_path);
        if (auth_connection_connect(auth) < 0) {
            auth_connection_deinit(&auth);
            break;
        }
        master_service_client_connection_accept(conn);
        (void)login_connection_init(director, conn->fd, auth,
            userdb ? LOGIN_CONNECTION_TYPE_USERDB :
            LOGIN_CONNECTION_TYPE_AUTH);
        break;
    case DIRECTOR_SOCKET_TYPE_AUTHREPLY:
        master_service_client_connection_accept(conn);
        (void)login_connection_init(director, conn->fd, NULL,
            LOGIN_CONNECTION_TYPE_AUTHREPLY);
        break;
    case DIRECTOR_SOCKET_TYPE_RING:
        if (director_client_connected(conn->fd, &conn->remote_ip) == 0)
            master_service_client_connection_accept(conn);
        break;
    case DIRECTOR_SOCKET_TYPE_DOVEADM:
        master_service_client_connection_accept(conn);
        (void)doveadm_connection_init(director, conn->fd);
        break;
    }
}

static void director_state_changed(struct director *dir)
{
    struct director_request *const *requestp;
    ARRAY(struct director_request *) new_requests;
    bool ret;

    if (!dir->ring_synced || !mail_hosts_have_usable(dir->mail_hosts))
        return;

    /* if there are any pending client requests, finish them now */
    t_array_init(&new_requests, 8);
    array_foreach(&dir->pending_requests, requestp) {
        ret = director_request_continue(*requestp);
        if (!ret) {
            /* a) request for a user being killed
               b) user is weak */
            array_append(&new_requests, requestp, 1);
        }
    }
    array_clear(&dir->pending_requests);
    array_append_array(&dir->pending_requests, &new_requests);

    if (dir->to_request != NULL && array_count(&new_requests) == 0)
        timeout_remove(&dir->to_request);
}

static void main_preinit(void)
{
    const struct director_settings *set;
    struct ip_addr listen_ip;
    in_port_t listen_port;

    if (master_service_settings_get(master_service)->verbose_proctitle) {
        to_proctitle_refresh =
            timeout_add(1000, director_refresh_proctitle_timeout,
                    (void *)NULL);
    }
    set = master_service_settings_get_others(master_service)[0];

    listener_sockets_init(&listen_ip, &listen_port);
    if (listen_port == 0 && *set->director_servers != '\0') {
        i_fatal("No inet_listeners defined for director service "
            "(for standalone keep director_servers empty)");
    }

    directors_init();
    director = director_init(set, &listen_ip, listen_port,
                 director_state_changed);
    director_host_add_from_string(director, set->director_servers);
    director_find_self(director);
    if (mail_hosts_parse_and_add(director->mail_hosts,
                     set->director_mail_servers) < 0)
        i_fatal("Invalid value for director_mail_servers setting");
    director->orig_config_hosts = mail_hosts_dup(director->mail_hosts);

    restrict_access_by_env(NULL, FALSE);
    restrict_access_allow_coredumps(TRUE);
}

static void main_deinit(void)
{
    if (to_proctitle_refresh != NULL)
        timeout_remove(&to_proctitle_refresh);
    if (notify_conn != NULL)
        notify_connection_deinit(&notify_conn);
    director_deinit(&director);
    directors_deinit();
    doveadm_connections_deinit();
    login_connections_deinit();
    auth_connections_deinit();
    array_free(&listener_socket_types);
}

int main(int argc, char *argv[])
{
    const struct setting_parser_info *set_roots[] = {
        &director_setting_parser_info,
        NULL
    };
    const enum master_service_flags service_flags =
        MASTER_SERVICE_FLAG_NO_IDLE_DIE;
    in_port_t test_port = 0;
    const char *error;
    bool debug = FALSE;
    int c;

    master_service = master_service_init("director", service_flags,
                         &argc, &argv, "Dt:");
    while ((c = master_getopt(master_service)) > 0) {
        switch (c) {
        case 'D':
            debug = TRUE;
            break;
        case 't':
            if (net_str2port(optarg, &test_port) < 0)
                i_fatal("-t: Not a port number: %s", optarg);
            break;
        default:
            return FATAL_DEFAULT;
        }
    }
    if (master_service_settings_read_simple(master_service, set_roots,
                        &error) < 0)
        i_fatal("Error reading configuration: %s", error);

    master_service_init_log(master_service, "director: ");

    main_preinit();
    director->test_port = test_port;
    director_debug = debug;
    director_connect(director);

    if (director->test_port != 0) {
        /* we're testing, possibly writing to same log file.
           make it clear which director we are. */
        master_service_init_log(master_service,
            t_strdup_printf("director(%s): ",
                    net_ip2addr(&director->self_ip)));
    }
    master_service_init_finish(master_service);

    master_service_run(master_service, client_connected);
    main_deinit();

    master_service_deinit(&master_service);
        return 0;
}