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/* GNU Mailutils -- a suite of utilities for electronic mail
Copyright (C) 2010-2012 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/cstr.h>
#include <mailutils/list.h>
#include <mailutils/iterator.h>
#include <mailutils/util.h>
#include <mailutils/smtp.h>
#include <mailutils/sys/smtp.h>
static int
_mech_comp (const void *item, const void *data)
{
return mu_c_strcasecmp ((const char*)item, (const char*)data);
}
int
mu_smtp_add_auth_mech (mu_smtp_t smtp, const char *mech)
{
char *p;
if (!smtp)
return EINVAL;
if (!smtp->authmech)
{
int rc = mu_list_create (&smtp->authmech);
if (rc)
return rc;
mu_list_set_destroy_item (smtp->authmech, mu_list_free_item);
mu_list_set_comparator (smtp->authmech, _mech_comp);
}
p = strdup (mech);
if (!p)
return ENOMEM;
mu_strupper (p);
return mu_list_append (smtp->authmech, p);
}
int
mu_smtp_clear_auth_mech (mu_smtp_t smtp)
{
if (!smtp)
return EINVAL;
mu_list_clear (smtp->authmech);
return 0;
}
static int
_mech_append (void *item, void *data)
{
mu_smtp_t smtp = data;
const char *mech = item;
return mu_smtp_add_auth_mech (smtp, mech);
}
int
mu_smtp_add_auth_mech_list (mu_smtp_t smtp, mu_list_t list)
{
if (!smtp)
return EINVAL;
return mu_list_foreach (list, _mech_append, smtp);
}
/* Set a list of implemented authentication mechanisms */
int
_mu_smtp_mech_impl (mu_smtp_t smtp, mu_list_t list)
{
mu_list_destroy (&smtp->authimpl);
smtp->authimpl = list;
mu_list_set_comparator (smtp->authimpl, _mech_comp);
return 0;
}
static int
_mech_copy (void *item, void *data)
{
const char *mech = item;
mu_list_t list = data;
return mu_list_append (list, (void *)mech);
}
/* Select authentication mechanism to use */
int
mu_smtp_mech_select (mu_smtp_t smtp, const char **pmech)
{
int rc;
const char *authstr;
mu_list_t alist;
mu_iterator_t itr;
if (!smtp)
return EINVAL;
/* Obtain the list of mechanisms supported by the server */
rc = mu_smtp_capa_test (smtp, "AUTH", &authstr);
if (rc)
return rc;
/* Create an intersection of implemented and allowed mechanisms */
if (!smtp->authimpl)
return MU_ERR_NOENT; /* obvious case */
if (!smtp->authmech)
{
rc = mu_list_create (&alist);
if (rc == 0)
rc = mu_list_foreach (smtp->authimpl, _mech_copy, alist);
}
else
{
rc = mu_list_intersect_dup (&alist, smtp->authmech, smtp->authimpl,
NULL, NULL);
}
if (rc)
return rc;
/* Select first element from the intersection that occurs also in the
list of methods supported by the server */
rc = mu_list_get_iterator (alist, &itr);
if (rc == 0)
{
const char *p;
int res = 1;
rc = MU_ERR_NOENT;
authstr += 5; /* "AUTH */
for (mu_iterator_first (itr); rc && !mu_iterator_is_done (itr);
mu_iterator_next (itr))
{
const char *mech;
mu_iterator_current (itr, (void**) &mech);
for (p = authstr; *p; )
{
char *end;
p = mu_str_stripws ((char *)p);
end = mu_str_skip_class_comp (p, MU_CTYPE_SPACE);
res = mu_c_strncasecmp (mech, p, end - p);
if (res == 0)
{
*pmech = mech;
rc = 0;
break;
}
p = end;
}
}
}
/* cleanup and return */
mu_list_destroy (&alist);
return rc;
}
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