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/* GNU Mailutils -- a suite of utilities for electronic mail
Copyright (C) 2010-2025 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 <string.h>
#include <mailutils/errno.h>
#include <mailutils/cctype.h>
#include <mailutils/list.h>
#include <mailutils/util.h>
#include <mailutils/smtp.h>
#include <mailutils/io.h>
#include <mailutils/sockaddr.h>
#include <mailutils/sys/smtp.h>
static int
capa_comp (const void *item, const void *value)
{
const char *capa = item;
const char *needle = value;
for (; *needle; capa++, needle++)
{
if (!*capa)
return 1;
if (mu_tolower (*capa) != mu_tolower (*needle))
return 1;
}
return !(*capa == 0 || mu_isspace (*capa));
}
int
mu_smtp_ehlo (mu_smtp_t smtp)
{
int status;
if (!smtp)
return EINVAL;
if (MU_SMTP_FISSET (smtp, _MU_SMTP_ERR))
return MU_ERR_FAILURE;
if (smtp->state != MU_SMTP_EHLO)
return MU_ERR_SEQ;
if (!smtp->param[MU_SMTP_PARAM_DOMAIN])
{
char *host;
char *p;
if (mu_get_host_name (&host) == 0)
{
if (host[0] == 0)
{
free (host);
host = p = NULL;
}
else
{
p = strchr (host, '.');
if (p)
p++;
else
p = host;
}
}
else
p = NULL;
if (!p)
{
struct mu_sockaddr *addr;
status = mu_stream_ioctl (smtp->carrier, MU_IOCTL_TCPSTREAM,
MU_IOCTL_TCP_GETSOCKNAME,
&addr);
if (status == 0)
{
status = mu_sockaddr_format (addr, &host,
mu_sockaddr_format_ehlo);
mu_sockaddr_free (addr);
p = host;
}
MU_SMTP_CHECK_ERROR (smtp, status);
}
status = mu_smtp_set_param (smtp, MU_SMTP_PARAM_DOMAIN, p);
free (host);
MU_SMTP_CHECK_ERROR (smtp, status);
}
status = mu_smtp_write (smtp, "EHLO %s\r\n",
smtp->param[MU_SMTP_PARAM_DOMAIN]);
MU_SMTP_CHECK_ERROR (smtp, status);
status = mu_smtp_response (smtp);
MU_SMTP_CHECK_ERROR (smtp, status);
if (smtp->replcode[0] == '2')
{
smtp->flags |= _MU_SMTP_ESMTP;
smtp->capa = smtp->mlrepl;
smtp->mlrepl = NULL;
mu_list_set_comparator (smtp->capa, capa_comp);
}
else if (smtp->replcode[0] == '4')
return MU_ERR_REPLY;
else
{
status = mu_smtp_write (smtp, "HELO %s\r\n",
smtp->param[MU_SMTP_PARAM_DOMAIN]);
MU_SMTP_CHECK_ERROR (smtp, status);
status = mu_smtp_response (smtp);
MU_SMTP_CHECK_ERROR (smtp, status);
smtp->flags &= ~_MU_SMTP_ESMTP;
if (smtp->replcode[0] != '2')
return MU_ERR_REPLY;
}
smtp->state = MU_SMTP_MAIL;
return 0;
}
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