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
 */

#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 <camel/camel-file-utils.h>
#include <camel/camel-data-wrapper.h>
#include <camel/camel-stream-fs.h>

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

#define d(x) x

static pthread_mutex_t em_junk_sa_test_lock = PTHREAD_MUTEX_INITIALIZER;
static pthread_mutex_t em_junk_sa_report_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 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,
    },
    NULL,
    NULL
};

static gboolean em_junk_sa_tested = FALSE;
static gboolean em_junk_sa_use_spamc = FALSE;
static gboolean em_junk_sa_available = FALSE;
static int em_junk_sa_spamd_port = -1;


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

static int
pipe_to_sa (CamelMimeMessage *msg, const char *in, char **argv)
{
    int result, status, errnosav, fds[2];
    CamelStream *stream;
    pid_t pid;
    
#if d(!)0
    {
        int i;
        
        printf ("pipe_to_sa ");
        for (i = 0; argv[i]; i++)
            printf ("%s ", argv[i]);
        printf ("\n");
    }
#endif
    
    if (pipe (fds) == -1) {
        errnosav = errno;
        d(printf ("failed to create a pipe (for use with spamassassin: %s\n", strerror (errno)));
        errno = errnosav;
        return -1;
    }
    
    if (!(pid = fork ())) {
        /* child process */
        int maxfd, fd, nullfd;
        
        nullfd = open ("/dev/null", O_WRONLY);
        
        if (dup2 (fds[0], STDIN_FILENO) == -1 ||
            dup2 (nullfd, STDOUT_FILENO) == -1 ||
            dup2 (nullfd, STDERR_FILENO) == -1)
            _exit (255);
        
        setsid ();
        
        maxfd = sysconf (_SC_OPEN_MAX);
        for (fd = 3; fd < maxfd; fd++)
            fcntl (fd, F_SETFD, FD_CLOEXEC);
        
        execvp (argv[0], argv);
        _exit (255);
    } else if (pid < 0) {
        errnosav = errno;
        close (fds[0]);
        close (fds[1]);
        errno = errnosav;
        return -1;
    }
    
    /* parent process */
    close (fds[0]);
    
    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_object_unref (stream);
    } else if (in) {
        camel_write (fds[1], in, strlen (in));
        close (fds[1]);
    }
    
    result = waitpid (pid, &status, 0);
    
    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 -1;
}

static int
em_junk_sa_test_spamd_running (int port)
{
    char port_buf[12], *argv[5];
    int i = 0;
    
    d(fprintf (stderr, "test if spamd is running (port %d)\n", port));
    
    argv[i++] = "spamc";
    argv[i++] = "-x";
    
    if (port > 0) {
        sprintf (port_buf, "%d", port);
        argv[i++] = "-p";
        argv[i++] = port_buf;
    }
    
    argv[i] = NULL;
    
    return pipe_to_sa (NULL, "From test@127.0.0.1", argv) == 0;
}

#define SPAMD_PORT      7830
#define MAX_SPAMD_PORT  SPAMD_PORT

static void
em_junk_sa_test_spamd (void)
{
    int port = SPAMD_PORT;
    char *argv[6] = {
        "/bin/sh",
        "-c",
        "spamassassin --version",
        NULL,
    };
    
    if (pipe_to_sa (NULL, NULL, argv) != 0) {
        em_junk_sa_available = FALSE;
        em_junk_sa_tested = TRUE;
        return;
    }
    
    em_junk_sa_available = TRUE;
    em_junk_sa_use_spamc = FALSE;
    
    if (em_junk_sa_test_spamd_running (-1)) {
        em_junk_sa_use_spamc = TRUE;
        em_junk_sa_spamd_port = -1;
    } else {
        for ( ; port < MAX_SPAMD_PORT; port++) {
            if (em_junk_sa_test_spamd_running (port)) {
                em_junk_sa_use_spamc = TRUE;
                em_junk_sa_spamd_port = port;
                break;
            }
        }
    }
    
    if (!em_junk_sa_use_spamc) {
        char port_buf[12];
        int i = 0;
        
        d(fprintf (stderr, "looks like spamd is not running\n"));
        
        argv[i++] = "spamd";
        argv[i++] = "--port";
        argv[i++] = port_buf;
        
        if (mail_session_get_sa_local_only ())
            argv[i++] = "--local";
        
        argv[i++] = "--daemonize";
        argv[i] = NULL;
        
        for ( ; port < MAX_SPAMD_PORT; port++) {
            d(fprintf (stderr, "trying to run spamd at port %d\n", port));
            
            sprintf (port_buf, "%d", port);
            if (!pipe_to_sa (NULL, NULL, argv)) {
                em_junk_sa_use_spamc = TRUE;
                em_junk_sa_spamd_port = port;
                d(fprintf (stderr, "success at port %d\n", port));
                break;
            }
        }
    }
    
    d(fprintf (stderr, "use spamd %d at port %d\n", em_junk_sa_use_spamc, em_junk_sa_spamd_port));
    
    em_junk_sa_tested = TRUE;
}

static gboolean
em_junk_sa_is_available (void)
{
    pthread_mutex_lock (&em_junk_sa_test_lock);
    if (!em_junk_sa_tested)
        em_junk_sa_test_spamd ();
    pthread_mutex_unlock (&em_junk_sa_test_lock);
    
    return em_junk_sa_available;
}

static gboolean
em_junk_sa_check_junk (CamelMimeMessage *msg)
{
    char *argv[5], buf[12];
    int i = 0;
    
    d(fprintf (stderr, "em_junk_sa_check_junk\n"));
    
    if (!em_junk_sa_is_available ())
        return FALSE;
    
    if (em_junk_sa_use_spamc && mail_session_get_sa_use_daemon ()) {
        argv[i++] = "spamc";
        argv[i++] = "-c";
        if (em_junk_sa_spamd_port != -1) {
            sprintf (buf, "%d", em_junk_sa_spamd_port);
            argv[i++] = "-p";
            argv[i++] = buf;
        }
    } else {
        argv[i++] = "/bin/sh";
        argv[i++] = "-c";
        
        if (mail_session_get_sa_local_only ())
            argv[i++] = "spamassassin --exit-code --local";
        else
            argv[i++] = "spamassassin --exit-code";
    }
    
    argv[i] = NULL;
    
    return pipe_to_sa (msg, NULL, argv);
}

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 (mail_session_get_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 (mail_session_get_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 (mail_session_get_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);
    }
}

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