path: root/mail/em-junk-filter.c

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
 * Author:
 *  Radek Doulik <rodo@ximian.com>
 *
 * Copyright 2003 Ximian, Inc. (www.ximian.com)
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of version 2 of the GNU General Public
 * License as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
 * USA
 */


#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <fcntl.h>
#include <errno.h>
#include <signal.h>
#include <string.h>
#include <pthread.h>
#include <signal.h>
#include <time.h>

#include <camel/camel-debug.h>
#include <camel/camel-file-utils.h>
#include <camel/camel-data-wrapper.h>
#include <camel/camel-stream-fs.h>
#include <camel/camel-stream-mem.h>
#include <camel/camel-i18n.h>
#include <e-util/e-mktemp.h>

#include "mail-session.h"
#include "em-junk-filter.h"

#include <gconf/gconf-client.h>

#define d(x) (camel_debug("junk")?(x):0)

static pthread_mutex_t em_junk_sa_init_lock = PTHREAD_MUTEX_INITIALIZER;
static pthread_mutex_t em_junk_sa_report_lock = PTHREAD_MUTEX_INITIALIZER;
static pthread_mutex_t em_junk_sa_preferred_socket_path_lock = PTHREAD_MUTEX_INITIALIZER;
static pthread_mutex_t em_junk_sa_spamd_restart_lock = PTHREAD_MUTEX_INITIALIZER;

static const char *em_junk_sa_get_name (void);
static gboolean em_junk_sa_check_junk (CamelMimeMessage *msg);
static void em_junk_sa_report_junk (CamelMimeMessage *msg);
static void em_junk_sa_report_notjunk (CamelMimeMessage *msg);
static void em_junk_sa_commit_reports (void);
static void em_junk_sa_init (void);
static void em_junk_sa_finalize (void);
static void em_junk_sa_kill_spamd (void);

static EMJunkPlugin spam_assassin_plugin = {
    {
        em_junk_sa_get_name,
        1,
        em_junk_sa_check_junk,
        em_junk_sa_report_junk,
        em_junk_sa_report_notjunk,
        em_junk_sa_commit_reports,
        em_junk_sa_init,
    },
    NULL,
    NULL
};

static gboolean em_junk_sa_tested = FALSE;
static gboolean em_junk_sa_spamd_tested = FALSE;
static gboolean em_junk_sa_use_spamc = FALSE;
static gboolean em_junk_sa_available = FALSE;
static gboolean em_junk_sa_system_spamd_available = FALSE;
static gboolean em_junk_sa_new_daemon_started = FALSE;
static char *em_junk_sa_socket_path = NULL;
static char *em_junk_sa_spamd_pidfile = NULL;
static char *em_junk_sa_spamc_binary = NULL;
static GConfClient *em_junk_sa_gconf = NULL;

/* volatile so not cached between threads */
static volatile gboolean em_junk_sa_local_only;
static volatile gboolean em_junk_sa_use_daemon;
static char * em_junk_sa_preferred_socket_path;

static char *em_junk_sa_spamc_binaries [3] = {"spamc", "/usr/sbin/spamc", NULL};
static char *em_junk_sa_spamd_binaries [3] = {"spamd", "/usr/sbin/spamd", NULL};

#define SPAMD_RESTARTS_SIZE 8
static time_t em_junk_sa_spamd_restarts [SPAMD_RESTARTS_SIZE] = {0, 0, 0, 0, 0, 0, 0, 0};
static int em_junk_sa_spamd_restarts_count = 0;

char *em_junk_sa_spamc_gconf_binary = NULL;
char *em_junk_sa_spamd_gconf_binary = NULL;

static const char *
em_junk_sa_get_name (void)
{
    return _("Spamassassin (built-in)");
}

static int
pipe_to_sa_full (CamelMimeMessage *msg, const char *in, char **argv, int rv_err, int wait_for_termination, GByteArray *output_buffer)
{
    int result, status, errnosav, fds[2], out_fds[2];
    CamelStream *stream;
    char *program;
    pid_t pid;
    

    if (camel_debug_start ("junk")) {
        int i;
        
        printf ("pipe_to_sa ");
        for (i = 0; argv[i]; i++)
            printf ("%s ", argv[i]);
        printf ("\n");
        camel_debug_end ();
    }

    program = g_find_program_in_path (argv [0]);
    if (program == NULL) {
        d(printf ("program not found, returning %d\n", rv_err));
        return rv_err;
    }
    g_free (program);
    
    if (pipe (fds) == -1) {
        errnosav = errno;
        d(printf ("failed to create a pipe (for use with spamassassin: %s\n", strerror (errno)));
        errno = errnosav;
        return rv_err;
    }
    
    if (output_buffer && pipe (out_fds) == -1) {
        errnosav = errno;
        d(printf ("failed to create a pipe (for use with spamassassin: %s\n", strerror (errno)));
        errno = errnosav;
        return rv_err;
    }
    
    if (!(pid = fork ())) {
        /* child process */
        int maxfd, fd, nullfd;
        
        nullfd = open ("/dev/null", O_WRONLY);
        
        if (dup2 (fds[0], STDIN_FILENO) == -1 ||
            dup2 (nullfd, STDERR_FILENO) == -1 ||
            (output_buffer == NULL && dup2 (nullfd, STDOUT_FILENO) == -1) ||
            (output_buffer != NULL && dup2 (out_fds[1], STDOUT_FILENO) == -1))
            _exit (rv_err & 0377);
        close (fds [0]);
        if (output_buffer)
            close (out_fds [1]);

        setsid ();
        
        maxfd = sysconf (_SC_OPEN_MAX);
        for (fd = 3; fd < maxfd; fd++)
            fcntl (fd, F_SETFD, FD_CLOEXEC);
        
        execvp (argv[0], argv);
        _exit (rv_err & 0377);
    } else if (pid < 0) {
        errnosav = errno;
        close (fds[0]);
        close (fds[1]);
        errno = errnosav;
        return rv_err;
    }
    
    /* parent process */
    close (fds[0]);
    if (output_buffer)
        close (out_fds [1]);
    
    if (msg) {
        stream = camel_stream_fs_new_with_fd (fds[1]);
        
        camel_data_wrapper_write_to_stream (CAMEL_DATA_WRAPPER (msg), stream);
        camel_stream_flush (stream);
        camel_stream_close (stream);
        camel_object_unref (stream);
    } else if (in) {
        camel_write (fds[1], in, strlen (in));
        close (fds[1]);
    }

    if (output_buffer) {
        CamelStreamMem *memstream;

        stream = camel_stream_fs_new_with_fd (out_fds[0]);
        
        memstream = (CamelStreamMem *) camel_stream_mem_new ();
        camel_stream_mem_set_byte_array (memstream, output_buffer);
        
        camel_stream_write_to_stream (stream, (CamelStream *) memstream);
        camel_object_unref (stream);
        g_byte_array_append (output_buffer, "", 1);

        d(printf ("child process output: %s len: %d\n", output_buffer->data, output_buffer->len));
    }
    
    if (wait_for_termination) {
        d(printf ("wait for child %d termination\n", pid));
        result = waitpid (pid, &status, 0);
    
        d(printf ("child %d terminated with result %d status %d exited %d exitstatus %d\n", pid, result, status, WIFEXITED (status), WEXITSTATUS (status)));

        if (result == -1 && errno == EINTR) {
            /* child process is hanging... */
            kill (pid, SIGTERM);
            sleep (1);
            result = waitpid (pid, &status, WNOHANG);
            if (result == 0) {
                /* ...still hanging, set phasers to KILL */
                kill (pid, SIGKILL);
                sleep (1);
                result = waitpid (pid, &status, WNOHANG);
            }
        }
    
        if (result != -1 && WIFEXITED (status))
            return WEXITSTATUS (status);
        else
            return rv_err;
    } else
        return 0;
}

static int
pipe_to_sa (CamelMimeMessage *msg, const char *in, char **argv)
{
    return pipe_to_sa_full (msg, in, argv, -1, 1, NULL);
}

static char *
em_junk_sa_get_socket_path ()
{
    if (em_junk_sa_preferred_socket_path)
        return em_junk_sa_preferred_socket_path;
    else
        return em_junk_sa_socket_path;
}

static gboolean
em_junk_sa_test_spamd_running (char *binary, gboolean system)
{
    char *argv[5];
    int i = 0;
    gboolean rv;

    pthread_mutex_lock (&em_junk_sa_preferred_socket_path_lock);

    d(fprintf (stderr, "test if spamd is running (system %d) or using socket path %s\n", system, em_junk_sa_get_socket_path ()));
    
    argv[i++] = binary;
    argv[i++] = "-x";
    
    if (!system) {
        argv[i++] = "-U";
        argv[i++] = em_junk_sa_get_socket_path ();
    }
    
    argv[i] = NULL;
    
    rv = pipe_to_sa (NULL, "From test@127.0.0.1", argv) == 0;

    d(fprintf (stderr, "result: %d (%s)\n", rv, rv ? "success" : "failed"));

    pthread_mutex_unlock (&em_junk_sa_preferred_socket_path_lock);

    return rv;
}

static void
em_junk_sa_test_spamassassin (void)
{
    char *argv [3] = {
        "spamassassin",
        "--version",
        NULL,
    };
    
    if (pipe_to_sa (NULL, NULL, argv) != 0)
        em_junk_sa_available = FALSE;
    else
        em_junk_sa_available = TRUE;

    em_junk_sa_tested = TRUE;
}

#define MAX_SPAMD_PORTS 1

static gboolean
em_junk_sa_run_spamd (char *binary)
{
    char *argv[8];
    int i;
    gboolean rv = FALSE;

    pthread_mutex_lock (&em_junk_sa_preferred_socket_path_lock);

    d(fprintf (stderr, "looks like spamd is not running\n"));

    i = 0;
    argv[i++] = binary;
    argv[i++] = "--socketpath";
    argv[i++] = em_junk_sa_get_socket_path ();
        
    if (em_junk_sa_local_only)
        argv[i++] = "--local";
        
    //argv[i++] = "--daemonize";
    argv[i++] = "--pidfile";
    argv[i++] = em_junk_sa_spamd_pidfile;
    argv[i] = NULL;

    d(fprintf (stderr, "trying to run %s with socket path %s\n", binary, em_junk_sa_get_socket_path ()));
            
    if (!pipe_to_sa_full (NULL, NULL, argv, -1, 0, NULL)) {
        int i;
        struct timespec time_req;
        struct stat stat_buf;

        d(fprintf (stderr, "success\n"));
        d(fprintf (stderr, "waiting for spamd to come up\n"));

        time_req.tv_sec = 0;
        time_req.tv_nsec = 50000000;

        for (i = 0; i < 100; i ++) {
            if (stat (em_junk_sa_get_socket_path (), &stat_buf) == 0) {
                d(fprintf (stderr, "socket created\n"));
                break;
            }
            nanosleep (&time_req, NULL);
        }
        d(fprintf (stderr, "waiting is over (after %dms)\n", 50*i));

        rv = TRUE;
    }

    pthread_mutex_unlock (&em_junk_sa_preferred_socket_path_lock);

    return rv;
}

static void
em_junk_sa_start_own_daemon ()
{
    int b;

    em_junk_sa_new_daemon_started = FALSE;

    em_junk_sa_socket_path = e_mktemp ("spamd-socket-path-XXXXXX");
    em_junk_sa_spamd_pidfile = e_mktemp ("spamd-pid-file-XXXXXX");

    for (b = 0; em_junk_sa_spamd_binaries [b]; b ++) {
        em_junk_sa_use_spamc = em_junk_sa_run_spamd (em_junk_sa_spamd_binaries [b]);
        if (em_junk_sa_use_spamc) {
            em_junk_sa_new_daemon_started = TRUE;
            break;
        }
    }
}

static void
em_junk_sa_find_spamc ()
{
    if (em_junk_sa_use_spamc && em_junk_sa_new_daemon_started) {
        int b;

        em_junk_sa_use_spamc = FALSE;
        for (b = 0; em_junk_sa_spamc_binaries [b]; b ++) {
            em_junk_sa_spamc_binary = em_junk_sa_spamc_binaries [b];
            if (em_junk_sa_test_spamd_running (em_junk_sa_spamc_binary, FALSE)) {
                em_junk_sa_use_spamc = TRUE;
                break;
            }
        }
    }
}

static void
em_junk_sa_test_spamd (void)
{
    char *argv[4];
    int i, b;
    gboolean try_system_spamd = TRUE;

    if (em_junk_sa_spamc_gconf_binary) {
        em_junk_sa_spamc_binaries [0] = em_junk_sa_spamc_gconf_binary;
        em_junk_sa_spamc_binaries [1] = NULL;
    }
  
    if (em_junk_sa_spamd_gconf_binary) {
        em_junk_sa_spamd_binaries [0] = em_junk_sa_spamd_gconf_binary;
        em_junk_sa_spamd_binaries [1] = NULL;
        try_system_spamd = FALSE;
    }

    em_junk_sa_use_spamc = FALSE;

    if (em_junk_sa_local_only && try_system_spamd) {
           i = 0;
           argv [i++] = "/bin/sh";
           argv [i++] = "-c";
           argv [i++] = "ps ax|grep -v grep|grep -E 'spamd.*(\\-L|\\-\\-local)'|grep -E -v '\\ \\-p\\ |\\ \\-\\-port\\ '";
           argv[i] = NULL;

           if (pipe_to_sa (NULL, NULL, argv) != 0) {
               try_system_spamd = FALSE;
               d(fprintf (stderr, "there's no system spamd with -L/--local parameter running\n"));
           }
    }

    /* try to use sytem spamd first */
    if (try_system_spamd) {
        for (b = 0; em_junk_sa_spamc_binaries [b]; b ++) {
            em_junk_sa_spamc_binary = em_junk_sa_spamc_binaries [b];
            if (em_junk_sa_test_spamd_running (em_junk_sa_spamc_binary, TRUE)) {
                em_junk_sa_use_spamc = TRUE;
                em_junk_sa_system_spamd_available = TRUE;
                break;
            }
        }
    }

    /* if there's no system spamd running, try to use user one with user specified socket */
    if (!em_junk_sa_use_spamc && em_junk_sa_preferred_socket_path) {
        for (b = 0; em_junk_sa_spamc_binaries [b]; b ++) {
            em_junk_sa_spamc_binary = em_junk_sa_spamc_binaries [b];
            if (em_junk_sa_test_spamd_running (em_junk_sa_spamc_binary, FALSE)) {
                em_junk_sa_use_spamc = TRUE;
                em_junk_sa_system_spamd_available = FALSE;
                break;
            }
        }
    }

    /* unsuccessful? try to run one ourselfs */
    if (!em_junk_sa_use_spamc)
        em_junk_sa_start_own_daemon ();

    /* new daemon started => let find spamc binary */
    em_junk_sa_find_spamc ();

    d(fprintf (stderr, "use spamd: %s\n", em_junk_sa_use_spamc ? "yes" : "no"));
    
    em_junk_sa_spamd_tested = TRUE;
}

static gboolean
em_junk_sa_is_available (void)
{
    pthread_mutex_lock (&em_junk_sa_init_lock);

    if (!em_junk_sa_tested)
        em_junk_sa_test_spamassassin ();

    if (em_junk_sa_available && !em_junk_sa_spamd_tested && em_junk_sa_use_daemon)
        em_junk_sa_test_spamd ();

    pthread_mutex_unlock (&em_junk_sa_init_lock);
    
    return em_junk_sa_available;
}

static gboolean
em_junk_sa_check_respawn_too_fast ()
{
    time_t time_now = time (NULL);
    gboolean rv;

    pthread_mutex_lock (&em_junk_sa_spamd_restart_lock);

    if (em_junk_sa_spamd_restarts_count >= SPAMD_RESTARTS_SIZE) {
        /* all restarts in last 5 minutes */
        rv = (time_now - em_junk_sa_spamd_restarts [em_junk_sa_spamd_restarts_count % SPAMD_RESTARTS_SIZE] < 5*60);
    } else
        rv = FALSE;

    em_junk_sa_spamd_restarts [em_junk_sa_spamd_restarts_count % SPAMD_RESTARTS_SIZE] = time_now;
    em_junk_sa_spamd_restarts_count ++;

    pthread_mutex_unlock (&em_junk_sa_spamd_restart_lock);

    d(printf ("em_junk_sa_check_respawn_too_fast: %d\n", rv));

    return rv;
}

static gboolean
em_junk_sa_respawn_spamd ()
{
    d(printf ("em_junk_sa_respawn_spamd\n"));
    if (em_junk_sa_test_spamd_running (em_junk_sa_spamc_binary, em_junk_sa_system_spamd_available)) {
        /* false alert */
        d(printf ("false alert, spamd still running\n"));

        return FALSE;
    }

    d(printf ("going to kill old spamd and start new one\n"));
    em_junk_sa_kill_spamd ();

    if (em_junk_sa_check_respawn_too_fast ()) {
        g_warning ("respawning of spamd too fast => fallback to use spamassassin directly");

        em_junk_sa_use_spamc = em_junk_sa_use_daemon = FALSE;
        return FALSE;
    }

    em_junk_sa_start_own_daemon ();
    em_junk_sa_find_spamc ();

    d(printf ("%s\n", em_junk_sa_use_spamc ? "success" : "failed"));

    return em_junk_sa_use_spamc;
}

static gboolean
em_junk_sa_check_junk (CamelMimeMessage *msg)
{
    GByteArray *out = NULL;
    char *argv[7], *to_free = NULL;
    int i = 0, socket_i;
    gboolean rv;

    d(fprintf (stderr, "em_junk_sa_check_junk\n"));
    
    if (!em_junk_sa_is_available ())
        return FALSE;

    if (em_junk_sa_use_spamc && em_junk_sa_use_daemon) {
        out = g_byte_array_new ();
        argv[i++] = em_junk_sa_spamc_binary;
        argv[i++] = "-c";
        argv[i++] = "-t";
        argv[i++] = "60";
        if (!em_junk_sa_system_spamd_available) {
            argv[i++] = "-U";

            pthread_mutex_lock (&em_junk_sa_preferred_socket_path_lock);
            socket_i = i;
            argv[i++] = to_free = g_strdup (em_junk_sa_get_socket_path ());
            pthread_mutex_unlock (&em_junk_sa_preferred_socket_path_lock);
        }
    } else {
        argv [i++] = "spamassassin";
        argv [i++] = "--exit-code";
        if (em_junk_sa_local_only)
            argv [i++] = "--local";
    }
    
    argv[i] = NULL;

    rv = pipe_to_sa_full (msg, NULL, argv, 0, 1, out) != 0;

    if (!rv && out && !strcmp (out->data, "0/0\n")) {
        /* an error occured */
        if (em_junk_sa_respawn_spamd ()) {
            g_byte_array_set_size (out, 0);

            pthread_mutex_lock (&em_junk_sa_preferred_socket_path_lock);
            g_free (to_free);
            argv [socket_i] = to_free = g_strdup (em_junk_sa_get_socket_path ());
            pthread_mutex_unlock (&em_junk_sa_preferred_socket_path_lock);

            rv = pipe_to_sa_full (msg, NULL, argv, 0, 1, out) != 0;
        } else if (!em_junk_sa_use_spamc)
            /* in case respawning were too fast we fallback to spamassassin */
            rv = em_junk_sa_check_junk (msg);
    }

    g_free (to_free);

    d(fprintf (stderr, "em_junk_sa_check_junk rv = %d\n", rv));

    if (out)
        g_byte_array_free (out, TRUE);

    return rv;
}

static void
em_junk_sa_report_junk (CamelMimeMessage *msg)
{
    char *argv[6] = {
        "sa-learn",
        "--no-rebuild",
        "--spam",
        "--single",
        NULL,
        NULL
    };
    
    d(fprintf (stderr, "em_junk_sa_report_junk\n"));
    
    if (em_junk_sa_is_available ()) {
        if (em_junk_sa_local_only)
            argv[4] = "--local";
        
        pthread_mutex_lock (&em_junk_sa_report_lock);
        pipe_to_sa (msg, NULL, argv);
        pthread_mutex_unlock (&em_junk_sa_report_lock);
    }
}

static void
em_junk_sa_report_notjunk (CamelMimeMessage *msg)
{
    char *argv[6] = {
        "sa-learn",
        "--no-rebuild",
        "--ham",
        "--single",
        NULL,
        NULL
    };
    
    d(fprintf (stderr, "em_junk_sa_report_notjunk\n"));
    
    if (em_junk_sa_is_available ()) {
        if (em_junk_sa_local_only)
            argv[4] = "--local";
        
        pthread_mutex_lock (&em_junk_sa_report_lock);
        pipe_to_sa (msg, NULL, argv);
        pthread_mutex_unlock (&em_junk_sa_report_lock);
    }
}

static void
em_junk_sa_commit_reports (void)
{
    char *argv[4] = {
        "sa-learn",
        "--rebuild",
        NULL,
        NULL
    };
    
    d(fprintf (stderr, "em_junk_sa_commit_reports\n"));
    
    if (em_junk_sa_is_available ()) {
        if (em_junk_sa_local_only)
            argv[2] = "--local";
        
        pthread_mutex_lock (&em_junk_sa_report_lock);
        pipe_to_sa (NULL, NULL, argv);
        pthread_mutex_unlock (&em_junk_sa_report_lock);
    }
}

static void
em_junk_sa_setting_notify(GConfClient *gconf, guint cnxn_id, GConfEntry *entry, void *data)
{
    GConfValue *value;
    char *tkey;

    g_return_if_fail (gconf_entry_get_key (entry) != NULL);
    
    if (!(value = gconf_entry_get_value (entry)))
        return;
    
    tkey = strrchr(entry->key, '/');
    g_return_if_fail (tkey != NULL);

    if (!strcmp(tkey, "local_only"))
        em_junk_sa_local_only = gconf_value_get_bool(value);
    else if (!strcmp(tkey, "use_daemon"))
        em_junk_sa_use_daemon = gconf_value_get_bool(value);
    else if (!strcmp(tkey, "socket_path")) {
        pthread_mutex_lock (&em_junk_sa_preferred_socket_path_lock);
        g_free (em_junk_sa_preferred_socket_path);
        em_junk_sa_preferred_socket_path = g_strdup (gconf_value_get_string(value));
        pthread_mutex_unlock (&em_junk_sa_preferred_socket_path_lock);
    }
}

const EMJunkPlugin *
em_junk_filter_get_plugin (void)
{
    return &spam_assassin_plugin;
}

static void
em_junk_sa_init (void)
{
    pthread_mutex_lock (&em_junk_sa_init_lock);

    if (!em_junk_sa_gconf) {
        em_junk_sa_gconf = gconf_client_get_default();
        gconf_client_add_dir (em_junk_sa_gconf, "/apps/evolution/mail/junk/sa", GCONF_CLIENT_PRELOAD_ONELEVEL, NULL);

        em_junk_sa_local_only = gconf_client_get_bool (em_junk_sa_gconf, "/apps/evolution/mail/junk/sa/local_only", NULL);
        em_junk_sa_use_daemon = gconf_client_get_bool (em_junk_sa_gconf, "/apps/evolution/mail/junk/sa/use_daemon", NULL);

        pthread_mutex_lock (&em_junk_sa_preferred_socket_path_lock);
        g_free (em_junk_sa_preferred_socket_path);
        em_junk_sa_preferred_socket_path = g_strdup (gconf_client_get_string (em_junk_sa_gconf, "/apps/evolution/mail/junk/sa/socket_path", NULL));
        pthread_mutex_unlock (&em_junk_sa_preferred_socket_path_lock);

        gconf_client_notify_add(em_junk_sa_gconf, "/apps/evolution/mail/junk/sa",
                    (GConfClientNotifyFunc)em_junk_sa_setting_notify,
                    NULL, NULL, NULL);

        em_junk_sa_spamc_gconf_binary = gconf_client_get_string (em_junk_sa_gconf, "/apps/evolution/mail/junk/sa/spamc_binary", NULL);
        em_junk_sa_spamd_gconf_binary = gconf_client_get_string (em_junk_sa_gconf, "/apps/evolution/mail/junk/sa/spamd_binary", NULL);
    }

    pthread_mutex_unlock (&em_junk_sa_init_lock);

    atexit (em_junk_sa_finalize);
}

static void
em_junk_sa_kill_spamd (void)
{
    pthread_mutex_lock (&em_junk_sa_preferred_socket_path_lock);
    g_free (em_junk_sa_preferred_socket_path);
    em_junk_sa_preferred_socket_path = NULL;
    pthread_mutex_unlock (&em_junk_sa_preferred_socket_path_lock);

    if (em_junk_sa_new_daemon_started) {
        int fd = open (em_junk_sa_spamd_pidfile, O_RDONLY);

        if (fd != -1) {
            char pid_str [16];
            int bytes;

            bytes = read (fd, pid_str, 15);
            if (bytes > 0) {
                int pid;

                pid_str [bytes] = 0;
                pid = atoi (pid_str);

                if (pid > 0) {
                    kill (pid, SIGTERM);
                    d(fprintf (stderr, "em_junk_sa_finalize send SIGTERM to daemon with pid %d\n", pid));
                    waitpid (pid, NULL, 0);
                }
            }

            close (fd);
        }
    }
}

static void
em_junk_sa_finalize (void)
{
    d(fprintf (stderr, "em_junk_sa_finalize\n"));

    em_junk_sa_kill_spamd ();
}