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 
 * 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-filter-crlf.h"
#include "camel-stream-filter.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_send_to (CamelTransport *transport,
                  CamelMimeMessage *message,
                  CamelAddress *from, CamelAddress *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->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_send_to (CamelTransport *transport, CamelMimeMessage *message,
          CamelAddress *from, CamelAddress *recipients,
          CamelException *ex)
{
    struct _header_raw *header, *savedbcc, *n, *tail;
    const char *from_addr, *addr, **argv;
    int i, len, fd[2], nullfd, wstat;
    CamelStreamFilter *filter;
    CamelMimeFilter *crlf;
    sigset_t mask, omask;
    CamelStream *out;
    pid_t pid;
    
    if (!camel_internet_address_get (CAMEL_INTERNET_ADDRESS (from), 0, NULL, &from_addr))
        return FALSE;
    
    len = camel_address_length (recipients);
    argv = g_malloc ((len + 6) * sizeof (char *));
    argv[0] = "sendmail";
    argv[1] = "-i";
    argv[2] = "-f";
    argv[3] = from_addr;
    argv[4] = "--";
    
    for (i = 0; i < len; i++) {
        if (!camel_internet_address_get (CAMEL_INTERNET_ADDRESS (recipients), i, NULL, &addr)) {
            camel_exception_set (ex, CAMEL_EXCEPTION_SYSTEM,
                         _("Could not parse recipient list"));
            g_free (argv);
            return FALSE;
        }
        
        argv[i + 5] = addr;
    }
    
    argv[i + 5] = NULL;
    
    /* unlink the bcc headers */
    savedbcc = NULL;
    tail = (struct _header_raw *) &savedbcc;
    
    header = (struct _header_raw *) &CAMEL_MIME_PART (message)->headers;
    n = header->next;
    while (n != NULL) {
        if (!strcasecmp (n->name, "Bcc")) {
            header->next = n->next;
            tail->next = n;
            n->next = NULL;
            tail = n;
        } else {
            header = n;
        }
        
        n = header->next;
    }
    
    if (pipe (fd) == -1) {
        camel_exception_setv (ex, CAMEL_EXCEPTION_SYSTEM,
                      _("Could not create pipe to sendmail: "
                    "%s: mail not sent"),
                      g_strerror (errno));
        
        /* restore the bcc headers */
        header->next = savedbcc;
        
        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);
        g_free (argv);
        
        /* restore the bcc headers */
        header->next = savedbcc;
        
        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);
    }
    g_free (argv);
    
    /* Parent process. Write the message out. */
    close (fd[0]);
    out = camel_stream_fs_new_with_fd (fd[1]);
    
    /* workaround for lame sendmail implementations that can't handle CRLF eoln sequences */
    filter = camel_stream_filter_new_with_stream (out);
    crlf = camel_mime_filter_crlf_new (CAMEL_MIME_FILTER_CRLF_DECODE, CAMEL_MIME_FILTER_CRLF_MODE_CRLF_ONLY);
    camel_stream_filter_add (filter, crlf);
    camel_object_unref (crlf);
    camel_object_unref (out);
    
    out = (CamelStream *) filter;
    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"),
                      g_strerror (errno));
        
        /* Wait for sendmail to exit. */
        while (waitpid (pid, &wstat, 0) == -1 && errno == EINTR)
            ;
        
        sigprocmask (SIG_SETMASK, &omask, NULL);
        
        /* restore the bcc headers */
        header->next = savedbcc;
        
        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);
    
    /* restore the bcc headers */
    header->next = savedbcc;
    
    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 char *
get_name (CamelService *service, gboolean brief)
{
    if (brief)
        return g_strdup (_("sendmail"));
    else
        return g_strdup (_("Mail delivery via the sendmail program"));
}