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. */

/* 
 *
 * Author : 
 *  Dan Winship <danw@helixcode.com>
 *
 * Copyright 2000 Helix Code, Inc. (http://www.helixcode.com)
 *
 * This program is free software; you can redistribute it and/or 
 * modify it under the terms of the GNU General Public License as 
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 * 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 <config.h>

#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <sys/wait.h>
#include <unistd.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 gboolean _can_send (CamelTransport *transport, CamelMedium *message);
static gboolean _send (CamelTransport *transport, CamelMedium *message,
               CamelException *ex);
static gboolean _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);

    /* virtual method overload */
    camel_transport_class->can_send = _can_send;
    camel_transport_class->send = _send;
    camel_transport_class->send_to = _send_to;
}

GtkType
camel_sendmail_transport_get_type (void)
{
    static GtkType camel_sendmail_transport_type = 0;
    
    if (!camel_sendmail_transport_type) {
        GtkTypeInfo camel_sendmail_transport_info = 
        {
            "CamelSendmailTransport",
            sizeof (CamelSendmailTransport),
            sizeof (CamelSendmailTransportClass),
            (GtkClassInitFunc) camel_sendmail_transport_class_init,
            (GtkObjectInitFunc) NULL,
                /* reserved_1 */ NULL,
                /* reserved_2 */ NULL,
            (GtkClassInitFunc) NULL,
        };
        
        camel_sendmail_transport_type = gtk_type_unique (CAMEL_TRANSPORT_TYPE, &camel_sendmail_transport_info);
    }
    
    return camel_sendmail_transport_type;
}


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


static gboolean
_send_internal (CamelMedium *message, 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);

    switch (fork ()) {
    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, argv);
        _exit (255);
    }

    /* Parent process. Write the message out. */
    close (fd[0]);
    out = camel_stream_fs_new_with_fd (fd[1]);
    camel_data_wrapper_write_to_stream (CAMEL_DATA_WRAPPER (message), out);
    camel_stream_close (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_set (ex, CAMEL_EXCEPTION_SYSTEM,
                         "Could not execute "
                         SENDMAIL_PATH ": mail not sent.");
        } else {
            camel_exception_setv (ex, CAMEL_EXCEPTION_SYSTEM,
                          "sendmail exited with status "
                          "%d: mail not sent.",
                          WEXITSTATUS (wstat));
        }
        return FALSE;
    }

    return TRUE;
}

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

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

    for (i = 1, r = recipients; i <= len; i++, r = r->next)
        argv[i + 2] = r->data;
    argv[i + 2] = NULL;

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

static gboolean
_send (CamelTransport *transport, CamelMedium *message,
       CamelException *ex)
{
    char *argv[4] = { "sendmail", "-t", "-i", NULL };

    return _send_internal (message, argv, ex);
}