path: root/camel/providers/sendmail/camel-sendmail-transport.c

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/* camel-sendmail-transport.c: Sendmail-based transport class. */

/* 
 *
 * Authors: Dan Winship <danw@ximian.com>
 *
 * Copyright 2000 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 
 * published by the Free Software Foundation; either version 2 of the
 * 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 <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <sys/wait.h>
#include <unistd.h>
#include <string.h>

#include "camel-sendmail-transport.h"
#include "camel-mime-message.h"
#include "camel-data-wrapper.h"
#include "camel-stream-fs.h"
#include "camel-exception.h"

static char *get_name (CamelService *service, gboolean brief);

static gboolean sendmail_can_send (CamelTransport *transport, CamelMedium *message);
static gboolean sendmail_send (CamelTransport *transport, CamelMedium *message,
                   CamelException *ex);
static gboolean sendmail_send_to (CamelTransport *transport, CamelMedium *message,
                  GList *recipients, CamelException *ex);


static void
camel_sendmail_transport_class_init (CamelSendmailTransportClass *camel_sendmail_transport_class)
{
    CamelTransportClass *camel_transport_class =
        CAMEL_TRANSPORT_CLASS (camel_sendmail_transport_class);
    CamelServiceClass *camel_service_class =
        CAMEL_SERVICE_CLASS (camel_sendmail_transport_class);

    /* virtual method overload */
    camel_service_class->get_name = get_name;

    camel_transport_class->can_send = sendmail_can_send;
    camel_transport_class->send = sendmail_send;
    camel_transport_class->send_to = sendmail_send_to;
}

CamelType
camel_sendmail_transport_get_type (void)
{
    static CamelType camel_sendmail_transport_type = CAMEL_INVALID_TYPE;
    
    if (camel_sendmail_transport_type == CAMEL_INVALID_TYPE)    {
        camel_sendmail_transport_type =
            camel_type_register (CAMEL_TRANSPORT_TYPE, "CamelSendmailTransport",
                         sizeof (CamelSendmailTransport),
                         sizeof (CamelSendmailTransportClass),
                         (CamelObjectClassInitFunc) camel_sendmail_transport_class_init,
                         NULL,
                         (CamelObjectInitFunc) NULL,
                         NULL);
    }
    
    return camel_sendmail_transport_type;
}


static gboolean
sendmail_can_send (CamelTransport *transport, CamelMedium *message)
{
    return CAMEL_IS_MIME_MESSAGE (message);
}


static gboolean
sendmail_send_internal (CamelMedium *message, const char **argv, CamelException *ex)
{
    int fd[2], nullfd, wstat;
    sigset_t mask, omask;
    CamelStream *out;
    pid_t pid;

    g_assert (CAMEL_IS_MIME_MESSAGE (message));

    if (pipe (fd) == -1) {
        camel_exception_setv (ex, CAMEL_EXCEPTION_SYSTEM,
                      _("Could not create pipe to sendmail: "
                    "%s: mail not sent"),
                      g_strerror (errno));
        return FALSE;
    }

    /* Block SIGCHLD so the calling application doesn't notice
     * sendmail exiting before we do.
     */
    sigemptyset (&mask);
    sigaddset (&mask, SIGCHLD);
    sigprocmask (SIG_BLOCK, &mask, &omask);

    pid = fork ();
    switch (pid) {
    case -1:
        camel_exception_setv (ex, CAMEL_EXCEPTION_SYSTEM,
                      _("Could not fork sendmail: "
                    "%s: mail not sent"),
                      g_strerror (errno));
        sigprocmask (SIG_SETMASK, &omask, NULL);
        return FALSE;

    case 0:
        /* Child process */
        nullfd = open ("/dev/null", O_RDWR);
        dup2 (fd[0], STDIN_FILENO);
        dup2 (nullfd, STDOUT_FILENO);
        dup2 (nullfd, STDERR_FILENO);
        close (nullfd);
        close (fd[1]);

        execv (SENDMAIL_PATH, (char **)argv);
        _exit (255);
    }

    /* Parent process. Write the message out. */
    close (fd[0]);
    out = camel_stream_fs_new_with_fd (fd[1]);
    if (camel_data_wrapper_write_to_stream (CAMEL_DATA_WRAPPER (message), out) == -1
        || camel_stream_close(out) == -1) {
        camel_object_unref (CAMEL_OBJECT (out));
        camel_exception_setv (ex, CAMEL_EXCEPTION_SYSTEM,
                      _("Could not send message: %s"),
                      strerror(errno));
        return FALSE;
    }
    camel_object_unref (CAMEL_OBJECT (out));

    /* Wait for sendmail to exit. */
    while (waitpid (pid, &wstat, 0) == -1 && errno == EINTR)
        ;
    sigprocmask (SIG_SETMASK, &omask, NULL);

    if (!WIFEXITED (wstat)) {
        camel_exception_setv (ex, CAMEL_EXCEPTION_SYSTEM,
                      _("sendmail exited with signal %s: "
                    "mail not sent."),
                      g_strsignal (WTERMSIG (wstat)));
        return FALSE;
    } else if (WEXITSTATUS (wstat) != 0) {
        if (WEXITSTATUS (wstat) == 255) {
            camel_exception_setv (ex, CAMEL_EXCEPTION_SYSTEM,
                          _("Could not execute %s: "
                        "mail not sent."),
                          SENDMAIL_PATH);
        } else {
            camel_exception_setv (ex, CAMEL_EXCEPTION_SYSTEM,
                          _("sendmail exited with status "
                        "%d: mail not sent."),
                          WEXITSTATUS (wstat));
        }
        return FALSE;
    }

    return TRUE;
}

static const char *
get_from (CamelMedium *message, CamelException *ex)
{
    const CamelInternetAddress *from;
    const char *name, *address;

    from = camel_mime_message_get_from (CAMEL_MIME_MESSAGE (message));
    if (!from || !camel_internet_address_get (from, 0, &name, &address)) {
        camel_exception_set (ex, CAMEL_EXCEPTION_SERVICE_UNAVAILABLE,
                     _("Could not find 'From' address in message"));
        return NULL;
    }
    return address;
}

static gboolean
sendmail_send_to (CamelTransport *transport, CamelMedium *message,
          GList *recipients, CamelException *ex)
{
    GList *r;
    const char *from, **argv;
    int i, len;
    gboolean status;

    from = get_from (message, ex);
    if (!from)
        return FALSE;

    len = g_list_length (recipients);
    argv = g_malloc ((len + 6) * sizeof (char *));
    argv[0] = "sendmail";
    argv[1] = "-i";
    argv[2] = "-f";
    argv[3] = from;
    argv[4] = "--";

    for (i = 1, r = recipients; i <= len; i++, r = r->next)
        argv[i + 4] = r->data;
    argv[i + 4] = NULL;

    status = sendmail_send_internal (message, argv, ex);
    g_free (argv);
    return status;
}

static gboolean
sendmail_send (CamelTransport *transport, CamelMedium *message,
       CamelException *ex)
{
    const char *argv[6] = { "sendmail", "-t", "-i", "-f", NULL, NULL };

    argv[4] = get_from (message, ex);
    if (!argv[4])
        return FALSE;

    return sendmail_send_internal (message, argv, ex);
}

static char *
get_name (CamelService *service, gboolean brief)
{
    if (brief)
        return g_strdup (_("sendmail"));
    else
        return g_strdup (_("Mail delivery via the sendmail program"));
}