smtp_starttls.c
2.65 KB
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/* GNU Mailutils -- a suite of utilities for electronic mail
Copyright (C) 2010 Free Software Foundation, Inc.
This library is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
This library 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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with GNU Mailutils. If not, see <http://www.gnu.org/licenses/>. */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <errno.h>
#include <stdlib.h>
#include <mailutils/errno.h>
#include <mailutils/list.h>
#include <mailutils/smtp.h>
#include <mailutils/stream.h>
#include <mailutils/sys/smtp.h>
#include <mailutils/tls.h>
static int
smtp_swap_streams (mu_smtp_t smtp, mu_stream_t *streams)
{
int rc;
if (MU_SMTP_FISSET (smtp, _MU_SMTP_TRACE))
rc = mu_stream_ioctl (smtp->carrier, MU_IOCTL_SWAP_STREAM, streams);
else if (streams[0] != streams[1])
rc = EINVAL;
else
{
mu_stream_t str = streams[0];
streams[0] = streams[1] = smtp->carrier;
smtp->carrier = str;
rc = 0;
}
return rc;
}
int
mu_smtp_starttls (mu_smtp_t smtp)
{
#ifdef WITH_TLS
int status;
mu_stream_t tlsstream, streams[2];
if (!smtp)
return EINVAL;
if (MU_SMTP_FISSET (smtp, _MU_SMTP_ERR))
return MU_ERR_FAILURE;
if (MU_SMTP_FISSET (smtp, _MU_SMTP_TLS))
return MU_ERR_SEQ;
if (smtp->state != MU_SMTP_MAIL)
return MU_ERR_SEQ;
status = mu_smtp_write (smtp, "STARTTLS\r\n");
MU_SMTP_CHECK_ERROR (smtp, status);
status = mu_smtp_response (smtp);
MU_SMTP_CHECK_ERROR (smtp, status);
if (smtp->replcode[0] == '4')
return EAGAIN;
else if (smtp->replcode[0] != '2')
return MU_ERR_FAILURE;
mu_stream_flush (smtp->carrier);
streams[0] = streams[1] = NULL;
status = smtp_swap_streams (smtp, streams);
MU_SMTP_CHECK_ERROR (smtp, status);
status = mu_tls_client_stream_create (&tlsstream,
streams[0], streams[1], 0);
MU_SMTP_CHECK_ERROR (smtp, status);
status = mu_stream_open (tlsstream);
if (status)
{
mu_stream_destroy (&tlsstream);
return status;
}
streams[0] = streams[1] = tlsstream;
status = smtp_swap_streams (smtp, streams);
MU_SMTP_CHECK_ERROR (smtp, status);
/* Invalidate the capability list */
mu_list_destroy (&smtp->capa);
return 0;
#else
return ENOSYS;
#endif
}