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

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/* camel-smtp-transport.c : class for a smtp transport */

/* 
 * Authors: Jeffrey Stedfast <fejj@helixcode.com>
 *
 * Copyright (C) 2000 Helix Code, Inc. (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 <sys/param.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <unistd.h>
#undef MIN
#undef MAX
#include "camel-mime-filter-crlf.h"
#include "camel-mime-filter-linewrap.h"
#include "camel-stream-filter.h"
#include "camel-smtp-transport.h"
#include "camel-mime-message.h"
#include "camel-multipart.h"
#include "camel-mime-part.h"
#include "camel-stream-buffer.h"
#include "camel-stream-fs.h"
#include "camel-session.h"
#include "camel-exception.h"

#define d(x) x

/* Specified in RFC 821 */
#define SMTP_PORT 25

/* camel smtp transport class prototypes */
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);

/* support prototypes */
static gboolean smtp_connect (CamelService *service, CamelException *ex);
static gboolean smtp_disconnect (CamelService *service, gboolean clean, CamelException *ex);
static GList *esmtp_get_authtypes(gchar *buffer);
static GList *query_auth_types (CamelService *service, CamelException *ex);
static void free_auth_types (CamelService *service, GList *authtypes);
static char *get_name (CamelService *service, gboolean brief);

static gboolean smtp_helo (CamelSmtpTransport *transport, CamelException *ex);
static gboolean smtp_mail (CamelSmtpTransport *transport, const char *sender,
               gboolean has_8bit_parts, CamelException *ex);
static gboolean smtp_rcpt (CamelSmtpTransport *transport, const char *recipient, CamelException *ex);
static gboolean smtp_data (CamelSmtpTransport *transport, CamelMedium *message,
               gboolean has_8bit_parts, CamelException *ex);
static gboolean smtp_rset (CamelSmtpTransport *transport, CamelException *ex);
static gboolean smtp_quit (CamelSmtpTransport *transport, CamelException *ex);

/* private data members */
static CamelServiceClass *service_class = NULL;

static void
camel_smtp_transport_class_init (CamelSmtpTransportClass *camel_smtp_transport_class)
{
    CamelTransportClass *camel_transport_class =
        CAMEL_TRANSPORT_CLASS (camel_smtp_transport_class);
    CamelServiceClass *camel_service_class =
        CAMEL_SERVICE_CLASS (camel_smtp_transport_class);
    
    service_class = CAMEL_SERVICE_CLASS (camel_type_get_global_classfuncs (camel_service_get_type ()));
    
    /* virtual method overload */
    camel_service_class->connect = smtp_connect;
    camel_service_class->disconnect = smtp_disconnect;
    camel_service_class->query_auth_types = query_auth_types;
    camel_service_class->free_auth_types = free_auth_types;
    camel_service_class->get_name = get_name;

    camel_transport_class->can_send = _can_send;
    camel_transport_class->send = _send;
    camel_transport_class->send_to = _send_to;
}

static void
camel_smtp_transport_init (gpointer object)
{
    CamelTransport *transport = CAMEL_TRANSPORT (object);
    
    transport->supports_8bit = FALSE;
}

CamelType
camel_smtp_transport_get_type (void)
{
    static CamelType camel_smtp_transport_type = CAMEL_INVALID_TYPE;
    
    if (camel_smtp_transport_type == CAMEL_INVALID_TYPE) {
        camel_smtp_transport_type =
            camel_type_register (CAMEL_TRANSPORT_TYPE, "CamelSmtpTransport",
                         sizeof (CamelSmtpTransport),
                         sizeof (CamelSmtpTransportClass),
                         (CamelObjectClassInitFunc) camel_smtp_transport_class_init,
                         NULL,
                         (CamelObjectInitFunc) camel_smtp_transport_init,
                         NULL);
    }
    
    return camel_smtp_transport_type;
}

static gboolean
smtp_connect (CamelService *service, CamelException *ex)
{
    CamelSmtpTransport *transport = CAMEL_SMTP_TRANSPORT (service);
    struct hostent *h;
    struct sockaddr_in sin;
    gint fd, num, i;
    guint32 addrlen;
    gchar *pass = NULL, *respbuf = NULL;
    
    if (!service_class->connect (service, ex))
        return FALSE;
    
    h = camel_service_gethost (service, ex);
    if (!h)
        return FALSE;
    
    /* set some smtp transport defaults */
    transport->is_esmtp = FALSE;
    transport->esmtp_supported_authtypes = NULL;
    CAMEL_TRANSPORT (transport)->supports_8bit = FALSE;
    
    sin.sin_family = h->h_addrtype;
    sin.sin_port = htons (service->url->port ? service->url->port : SMTP_PORT);
    memcpy (&sin.sin_addr, h->h_addr, sizeof (sin.sin_addr));
    
    fd = socket (h->h_addrtype, SOCK_STREAM, 0);
    if (fd == -1 || connect (fd, (struct sockaddr *)&sin, sizeof (sin)) == -1) {
        camel_exception_setv (ex, CAMEL_EXCEPTION_SERVICE_UNAVAILABLE,
                      _("Could not connect to %s (port %d): %s"),
                      service->url->host,
                      service->url->port ? service->url->port : SMTP_PORT,
                      strerror (errno));
        if (fd > -1)
            close (fd);
        g_free (pass);
        return FALSE;
    }
    
    /* get the localaddr - needed later by smtp_helo */
    addrlen = sizeof (transport->localaddr);
    getsockname (fd, (struct sockaddr*)&transport->localaddr, &addrlen);
    
    transport->ostream = camel_stream_fs_new_with_fd (fd);
    transport->istream = camel_stream_buffer_new (transport->ostream, 
                              CAMEL_STREAM_BUFFER_READ);
    
    /* Read the greeting, note whether the server is ESMTP or not. */
    do {
        /* Check for "220" */
        g_free (respbuf);
        respbuf = camel_stream_buffer_read_line (CAMEL_STREAM_BUFFER (transport->istream));
        if (!respbuf || strncmp (respbuf, "220", 3)) {
            camel_exception_setv (ex, CAMEL_EXCEPTION_SYSTEM,
                          _("Welcome response error: %s: possibly non-fatal"),
                          g_strerror (errno));
            return FALSE;
        }
        if (strstr (respbuf, "ESMTP"))
            transport->is_esmtp = TRUE;
    } while (*(respbuf+3) == '-'); /* if we got "220-" then loop again */
    g_free (respbuf);
    
    /* send HELO (or EHLO, depending on the service type) */
    if (!transport->is_esmtp) {
        /* If we did not auto-detect ESMTP, we should still send EHLO */
        transport->is_esmtp = TRUE;
        if (!smtp_helo (transport, NULL)) {
            /* Okay, apprently this server doesn't support ESMTP */
            transport->is_esmtp = FALSE;
            smtp_helo (transport, ex);
        }
    } else {
        /* send EHLO */
        smtp_helo (transport, ex);
    }
    
    /* check to see if AUTH is required, if so...then AUTH ourselves */
    if (transport->is_esmtp && transport->esmtp_supported_authtypes) {
        /* not really supported yet, but we can at least show what auth types are supported */
        d(fprintf (stderr, "camel-smtp-transport::connect(): %s requires AUTH\n", service->url->host));
        num = g_list_length (transport->esmtp_supported_authtypes);
        
        for (i = 0; i < num; i++)
            d(fprintf (stderr, "\nSupported AUTH: %s\n\n", 
                (gchar *) g_list_nth_data (transport->esmtp_supported_authtypes, i)));
        
        g_list_free (transport->esmtp_supported_authtypes);
        transport->esmtp_supported_authtypes = NULL;
    } else {
        d(fprintf (stderr, "\ncamel-smtp-transport::connect(): provider does not use AUTH\n\n"));
    }
    
    return TRUE;
}

static gboolean
smtp_disconnect (CamelService *service, gboolean clean, CamelException *ex)
{
    CamelSmtpTransport *transport = CAMEL_SMTP_TRANSPORT (service);
    
    /*if (!service->connected)
     *  return TRUE;
     */

    if (clean) {
        /* send the QUIT command to the SMTP server */
        smtp_quit (transport, ex);
    }
    
    if (!service_class->disconnect (service, clean, ex))
        return FALSE;
    
    g_free (transport->esmtp_supported_authtypes);
    transport->esmtp_supported_authtypes = NULL;
    camel_object_unref (CAMEL_OBJECT (transport->ostream));
    camel_object_unref (CAMEL_OBJECT (transport->istream));
    transport->ostream = NULL;
    transport->istream = NULL;
    
    return TRUE;
}

static GList *
esmtp_get_authtypes (gchar *buffer)
{
    GList *ret = NULL;
    gchar *start, *end;
    
    /* advance to the first token */
    for (start = buffer; *start == ' ' || *start == '='; start++);
    
    for ( ; *start; ) {
        /* advance to the end of the token */
        for (end = start; *end && *end != ' '; end++);
        
        ret = g_list_append (ret, g_strndup (start, end - start));
        
        /* advance to the next token */
        for (start = end; *start == ' '; start++);
    }
    
    return ret;
}

/* FIXME: use these? */
#ifdef notyet
static CamelServiceAuthType no_authtype = {
    _("No authentication required"),
    
    _("This option will connect to the SMTP server without using any "
      "kind of authentication. This should be fine for connecting to "
      "most SMTP servers.")
    
    _(""),
    FALSE
};

static CamelServiceAuthType cram_md5_authtype = {
    _("CRAM-MD5"),
    
    _("This option will connect to the SMTP server using CRAM-MD5 "
      "authentication."),
    
    _("CRAM-MD5"),
    TRUE
};
#endif

static GList *
query_auth_types (CamelService *service, CamelException *ex)
{
    /* FIXME: Re-enable this when auth types are actually
     * implemented.
     */
    
    return NULL;
}

static void
free_auth_types (CamelService *service, GList *authtypes)
{
    g_list_free (authtypes);
}

static char *
get_name (CamelService *service, gboolean brief)
{
    if (brief)
        return g_strdup_printf (_("SMTP server %s"), service->url->host);
    else {
        return g_strdup_printf (_("SMTP mail delivery via %s"),
                    service->url->host);
    }
}

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

static gboolean
_send_to (CamelTransport *transport, CamelMedium *message,
      GList *recipients, CamelException *ex)
{
    CamelSmtpTransport *smtp_transport = CAMEL_SMTP_TRANSPORT (transport);
    const CamelInternetAddress *cia;
    char *recipient;
    const char *addr;
    gboolean has_8bit_parts;
    GList *r;
    
    cia = camel_mime_message_get_from(CAMEL_MIME_MESSAGE (message));
    if (!cia) {
        camel_exception_setv (ex, CAMEL_EXCEPTION_SYSTEM,
                      _("Cannot send message: "
                    "sender address not defined."));
        return FALSE;
    }
    
    if (!camel_internet_address_get (cia, 0, NULL, &addr)) {
        camel_exception_setv (ex, CAMEL_EXCEPTION_SYSTEM,
                      _("Cannot send message: "
                    "sender address not valid."));
        return FALSE;
    }
    
    /* find out if the message has 8bit mime parts */
    has_8bit_parts = camel_mime_message_has_8bit_parts (CAMEL_MIME_MESSAGE (message));
    
    /* rfc1652 (8BITMIME) requires that you notify the ESMTP daemon that
       you'll be sending an 8bit mime message at "MAIL FROM:" time. */
    smtp_mail (smtp_transport, addr, has_8bit_parts, ex);
    
    if (!recipients) {
        camel_exception_setv (ex, CAMEL_EXCEPTION_SYSTEM,
                      _("Cannot send message: "
                    "no recipients defined."));
        return FALSE;
    }
    
    for (r = recipients; r; r = r->next) {
        recipient = (char *) r->data;
        if (!smtp_rcpt (smtp_transport, recipient, ex)) {
            g_free (recipient);
            return FALSE;
        }
        g_free (recipient);
    }
    
    /* passing in has_8bit_parts saves time as we don't have to
           recurse through the message all over again if the user is
           not sending 8bit mime parts */
    if (!smtp_data (smtp_transport, message, has_8bit_parts, ex))
        return FALSE;
    
    /* reset the service for our next transfer session */
    smtp_rset (smtp_transport, ex);
    
    return TRUE;
}

static gboolean
_send (CamelTransport *transport, CamelMedium *message, CamelException *ex)
{
    const CamelInternetAddress *to, *cc, *bcc;
    GList *recipients = NULL;
    guint index, len;
    
    to = camel_mime_message_get_recipients (CAMEL_MIME_MESSAGE (message), CAMEL_RECIPIENT_TYPE_TO);
    cc = camel_mime_message_get_recipients (CAMEL_MIME_MESSAGE (message), CAMEL_RECIPIENT_TYPE_CC);
    bcc = camel_mime_message_get_recipients (CAMEL_MIME_MESSAGE (message), CAMEL_RECIPIENT_TYPE_BCC);
    
    /* get all of the To addresses into our recipient list */
    len = CAMEL_ADDRESS (to)->addresses->len;
    for (index = 0; index < len; index++) {
        const char *addr;
        
        if (camel_internet_address_get (to, index, NULL, &addr))
            recipients = g_list_append (recipients, g_strdup (addr));
    }
    
    /* get all of the Cc addresses into our recipient list */
    len = CAMEL_ADDRESS (cc)->addresses->len;
    for (index = 0; index < len; index++) {
        const char *addr;
        
        if (camel_internet_address_get (cc, index, NULL, &addr))
            recipients = g_list_append (recipients, g_strdup (addr));
    }
    
    /* get all of the Bcc addresses into our recipient list */
    len = CAMEL_ADDRESS (bcc)->addresses->len;
    for (index = 0; index < len; index++) {
        const char *addr;
        
        if (camel_internet_address_get (bcc, index, NULL, &addr))
            recipients = g_list_append (recipients, g_strdup (addr));
    }
    
    return _send_to (transport, message, recipients, ex);
}

static gboolean
smtp_helo (CamelSmtpTransport *transport, CamelException *ex)
{
    /* say hello to the server */
    gchar *cmdbuf, *respbuf = NULL;
    struct hostent *host;
    
    /* get the local host name */
    host = gethostbyaddr ((gchar *)&transport->localaddr.sin_addr, sizeof (transport->localaddr.sin_addr), AF_INET);
    
    /* hiya server! how are you today? */
    if (transport->is_esmtp) {
        if (host && host->h_name)
            cmdbuf = g_strdup_printf ("EHLO %s\r\n", host->h_name);
        else
            cmdbuf = g_strdup_printf ("EHLO [%s]\r\n", inet_ntoa (transport->localaddr.sin_addr));
    } else {
        if (host && host->h_name)
            cmdbuf = g_strdup_printf ("HELO %s\r\n", host->h_name);
        else
            cmdbuf = g_strdup_printf ("HELO [%s]\r\n", inet_ntoa (transport->localaddr.sin_addr));
    }
    
    d(fprintf (stderr, "sending : %s", cmdbuf));
    if (camel_stream_write (transport->ostream, cmdbuf, strlen (cmdbuf)) == -1) {
        g_free (cmdbuf);
        camel_exception_setv (ex, CAMEL_EXCEPTION_SYSTEM,
                      _("HELO request timed out: %s: non-fatal"),
                      g_strerror (errno));
        return FALSE;
    }
    g_free (cmdbuf);
    
    do {
        /* Check for "250" */
        g_free (respbuf);
        respbuf = camel_stream_buffer_read_line (CAMEL_STREAM_BUFFER (transport->istream));
        
        d(fprintf (stderr, "received: %s\n", respbuf ? respbuf : "(null)"));
        
        if (!respbuf || strncmp (respbuf, "250", 3)) {
            g_free (respbuf);
            camel_exception_setv (ex, CAMEL_EXCEPTION_SYSTEM,
                          _("HELO response error: %s: non-fatal"),
                          g_strerror (errno));
            return FALSE;
        }
        
        if (strstr (respbuf, "8BITMIME")) {
            d(fprintf (stderr, "This server supports 8bit\n"));
            CAMEL_TRANSPORT (transport)->supports_8bit = TRUE;
        }
        
        if (transport->is_esmtp && strstr (respbuf, "AUTH")) {
            /* parse for supported AUTH types */
            char *auths = strstr (respbuf, "AUTH") + 4;
            
            transport->esmtp_supported_authtypes = esmtp_get_authtypes (auths);
        }
    } while (*(respbuf+3) == '-'); /* if we got "250-" then loop again */
    g_free (respbuf);
    
    return TRUE;
}

static gboolean
smtp_mail (CamelSmtpTransport *transport, const char *sender, gboolean has_8bit_parts, CamelException *ex)
{
    /* we gotta tell the smtp server who we are. (our email addy) */
    gchar *cmdbuf, *respbuf = NULL;
    
    /* enclose address in <>'s since some SMTP daemons *require* that */
    if (CAMEL_TRANSPORT (transport)->supports_8bit && has_8bit_parts)
        cmdbuf = g_strdup_printf ("MAIL FROM: <%s> BODY=8BITMIME\r\n", sender);
    else
        cmdbuf = g_strdup_printf ("MAIL FROM: <%s>\r\n", sender);
    
    d(fprintf (stderr, "sending : %s", cmdbuf));
    
    if (camel_stream_write (transport->ostream, cmdbuf, strlen (cmdbuf)) == -1) {
        g_free (cmdbuf);
        camel_exception_setv (ex, CAMEL_EXCEPTION_SYSTEM,
                      _("MAIL FROM request timed out: %s: mail not sent"),
                      g_strerror (errno));
        return FALSE;
    }
    g_free (cmdbuf);
    
    do {
        /* Check for "250 Sender OK..." */
        g_free (respbuf);
        respbuf = camel_stream_buffer_read_line (CAMEL_STREAM_BUFFER (transport->istream));
        
        d(fprintf (stderr, "received: %s\n", respbuf ? respbuf : "(null)"));
        
        if (!respbuf || strncmp (respbuf, "250", 3)) {
            g_free (respbuf);
            camel_exception_setv (ex, CAMEL_EXCEPTION_SYSTEM,
                          _("MAIL FROM response error: %s: mail not sent"),
                          g_strerror (errno));
            return FALSE;
        }
    } while (*(respbuf+3) == '-'); /* if we got "250-" then loop again */
    g_free (respbuf);
    
    return TRUE;
}

static gboolean
smtp_rcpt (CamelSmtpTransport *transport, const char *recipient, CamelException *ex)
{
    /* we gotta tell the smtp server who we are going to be sending
     * our email to */
    gchar *cmdbuf, *respbuf = NULL;
    
    /* enclose address in <>'s since some SMTP daemons *require* that */
    cmdbuf = g_strdup_printf ("RCPT TO: <%s>\r\n", recipient);
    
    d(fprintf (stderr, "sending : %s", cmdbuf));
    
    if (camel_stream_write (transport->ostream, cmdbuf, strlen (cmdbuf)) == -1) {
        g_free (cmdbuf);
        camel_exception_setv (ex, CAMEL_EXCEPTION_SYSTEM,
                      _("RCPT TO request timed out: %s: mail not sent"),
                      g_strerror (errno));
        return FALSE;
    }
    g_free (cmdbuf);
    
    do {
        /* Check for "250 Sender OK..." */
        g_free (respbuf);
        respbuf = camel_stream_buffer_read_line (CAMEL_STREAM_BUFFER (transport->istream));
        
        d(fprintf (stderr, "received: %s\n", respbuf ? respbuf : "(null)"));
        
        if (!respbuf || strncmp (respbuf, "250", 3)) {
            g_free (respbuf);
            camel_exception_setv (ex, CAMEL_EXCEPTION_SYSTEM,
                          _("RCPT TO response error: %s: mail not sent"),
                          g_strerror (errno));
            return FALSE;
        }
    } while (*(respbuf+3) == '-'); /* if we got "250-" then loop again */
    g_free (respbuf);
    
    return TRUE;
}

static gboolean
smtp_data (CamelSmtpTransport *transport, CamelMedium *message, gboolean has_8bit_parts, CamelException *ex)
{
    /* now we can actually send what's important :p */
    gchar *cmdbuf, *respbuf = NULL;
    CamelStreamFilter *filtered_stream;
    CamelMimeFilter *crlffilter;
    
    /* if the message contains 8bit mime parts and the server
           doesn't support it, encode 8bit parts to the best
           encoding.  This will also enforce an encoding to keep the lines in limit */
    if (has_8bit_parts && !CAMEL_TRANSPORT (transport)->supports_8bit)
        camel_mime_message_encode_8bit_parts (CAMEL_MIME_MESSAGE (message));
    
    cmdbuf = g_strdup ("DATA\r\n");
    
    d(fprintf (stderr, "sending : %s", cmdbuf));
    
    if (camel_stream_write (transport->ostream, cmdbuf, strlen (cmdbuf)) == -1) {
        g_free (cmdbuf);
        camel_exception_setv (ex, CAMEL_EXCEPTION_SYSTEM,
                      _("DATA request timed out: %s: mail not sent"),
                      g_strerror (errno));
        return FALSE;
    }
    g_free (cmdbuf);
    
    respbuf = camel_stream_buffer_read_line (CAMEL_STREAM_BUFFER (transport->istream));
    
    d(fprintf (stderr, "received: %s\n", respbuf ? respbuf : "(null)"));
    
    if (!respbuf || strncmp (respbuf, "354", 3)) {
        /* we should have gotten instructions on how to use the DATA command:
         * 354 Enter mail, end with "." on a line by itself
         */
        g_free (respbuf);
        camel_exception_setv (ex, CAMEL_EXCEPTION_SYSTEM,
                      _("DATA response error: %s: mail not sent"),
                      g_strerror (errno));
        return FALSE;
    }

    g_free (respbuf);
    respbuf = NULL;
    
    /* setup stream filtering */
    crlffilter = camel_mime_filter_crlf_new (CAMEL_MIME_FILTER_CRLF_ENCODE, CAMEL_MIME_FILTER_CRLF_MODE_CRLF_DOTS);
    filtered_stream = camel_stream_filter_new_with_stream (transport->ostream);
    camel_stream_filter_add (filtered_stream, CAMEL_MIME_FILTER (crlffilter));
    
    if (camel_data_wrapper_write_to_stream (CAMEL_DATA_WRAPPER (message), CAMEL_STREAM (filtered_stream)) == -1) {
        camel_exception_setv (ex, CAMEL_EXCEPTION_SYSTEM,
                      _("DATA send timed out: message termination: "
                    "%s: mail not sent"),
                      g_strerror (errno));
        
        camel_object_unref (CAMEL_OBJECT (filtered_stream));
        
        return FALSE;
    }
    
    camel_stream_flush (CAMEL_STREAM (filtered_stream));
    camel_object_unref (CAMEL_OBJECT (filtered_stream));
    
    /* terminate the message body */
    
    d(fprintf (stderr, "sending : \\r\\n.\\r\\n\n"));
    
    if (camel_stream_write (transport->ostream, "\r\n.\r\n", 5) == -1) {
        camel_exception_setv (ex, CAMEL_EXCEPTION_SYSTEM,
                      _("DATA send timed out: message termination: "
                    "%s: mail not sent"),
                      g_strerror (errno));
        return FALSE;
    }
    
    do {
        /* Check for "250 Sender OK..." */
        g_free (respbuf);
        respbuf = camel_stream_buffer_read_line (CAMEL_STREAM_BUFFER (transport->istream));
        
        d(fprintf (stderr, "received: %s\n", respbuf ? respbuf : "(null)"));
        
        if (!respbuf || strncmp (respbuf, "250", 3)) {
            g_free (respbuf);
            camel_exception_setv (ex, CAMEL_EXCEPTION_SYSTEM,
                          _("DATA response error: message termination: "
                        "%s: mail not sent"),
                          g_strerror (errno));
            return FALSE;
        }
    } while (*(respbuf+3) == '-'); /* if we got "250-" then loop again */
    g_free (respbuf);
    
    return TRUE;
}

static gboolean
smtp_rset (CamelSmtpTransport *transport, CamelException *ex)
{
    /* we are going to reset the smtp server (just to be nice) */
    gchar *cmdbuf, *respbuf = NULL;
    
    cmdbuf = g_strdup ("RSET\r\n");
    
    d(fprintf (stderr, "sending : %s", cmdbuf));
    
    if (camel_stream_write (transport->ostream, cmdbuf, strlen (cmdbuf)) == -1) {
        g_free (cmdbuf);
        camel_exception_setv (ex, CAMEL_EXCEPTION_SYSTEM,
                      _("RSET request timed out: %s"),
                      g_strerror (errno));
        return FALSE;
    }
    g_free (cmdbuf);
    
    do {
        /* Check for "250" */
        g_free (respbuf);
        respbuf = camel_stream_buffer_read_line (CAMEL_STREAM_BUFFER (transport->istream));
        
        d(fprintf (stderr, "received: %s\n", respbuf ? respbuf : "(null)"));
        
        if (!respbuf || strncmp (respbuf, "250", 3)) {
            g_free (respbuf);
            camel_exception_setv (ex, CAMEL_EXCEPTION_SYSTEM,
                          _("RSET response error: %s"),
                          g_strerror (errno));
            return FALSE;
        }
    } while (*(respbuf+3) == '-'); /* if we got "250-" then loop again */
    g_free (respbuf);
    
    return TRUE;
}

static gboolean
smtp_quit (CamelSmtpTransport *transport, CamelException *ex)
{
    /* we are going to reset the smtp server (just to be nice) */
    gchar *cmdbuf, *respbuf = NULL;
    
    cmdbuf = g_strdup ("QUIT\r\n");
    
    d(fprintf (stderr, "sending : %s", cmdbuf));
    
    if (camel_stream_write (transport->ostream, cmdbuf, strlen (cmdbuf)) == -1) {
        g_free (cmdbuf);
        camel_exception_setv (ex, CAMEL_EXCEPTION_SYSTEM,
                      _("QUIT request timed out: %s: non-fatal"),
                      g_strerror (errno));
        return FALSE;
    }
    g_free (cmdbuf);
    
    do {
        /* Check for "221" */
        g_free (respbuf);
        respbuf = camel_stream_buffer_read_line (CAMEL_STREAM_BUFFER (transport->istream));
        
        d(fprintf (stderr, "received: %s\n", respbuf ? respbuf : "(null)"));
        
        if (!respbuf || strncmp (respbuf, "221", 3)) {
            g_free (respbuf);
            camel_exception_setv (ex, CAMEL_EXCEPTION_SYSTEM,
                          _("QUIT response error: %s: non-fatal"),
                          g_strerror (errno));
            return FALSE;
        }
    } while (*(respbuf+3) == '-'); /* if we got "221-" then loop again */
    g_free (respbuf);
    
    return TRUE;
}