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/*
gsasl.c
This file is part of GNU Anubis.
Copyright (C) 2003,2004 The Anubis Team.
GNU Anubis 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.
GNU Anubis 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 GNU Anubis; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
GNU Anubis is released under the GPL with the additional exemption that
compiling, linking, and/or using OpenSSL is allowed.
*/
#include "headers.h"
#include "extern.h"
#if defined(WITH_GSASL)
#include "lbuf.h"
/* Basic I/O Functions */
struct anubis_gsasl_stream
{
Gsasl_session_ctx *sess_ctx; /* Context */
struct _line_buffer *lb;
NET_STREAM stream;
};
static const char *
_gsasl_strerror (void *ignored_data, int rc)
{
return gsasl_strerror (rc);
}
int
write_chunk (void *data, char *start, char *end)
{
struct anubis_gsasl_stream *s = data;
size_t chunk_size = end - start + 1;
size_t len;
size_t wrsize;
char *buf = NULL;
len = 0;
gsasl_encode (s->sess_ctx, start, chunk_size, &buf, &len);
wrsize = 0;
do
{
size_t sz;
int rc = stream_write (s->stream, buf + wrsize, len - wrsize,
&sz);
if (rc)
{
if (rc == EINTR)
continue;
free (buf);
return rc;
}
wrsize += sz;
}
while (wrsize < len);
free (buf);
return 0;
}
static int
_gsasl_write (void *sd, char *data, size_t size, size_t * nbytes)
{
struct anubis_gsasl_stream *s = sd;
int rc = _auth_lb_grow (s->lb, data, size);
if (rc)
return rc;
return _auth_lb_writelines (s->lb, data, size, write_chunk, s, nbytes);
}
static int
_gsasl_read (void *sd, char *data, size_t size, size_t * nbytes)
{
struct anubis_gsasl_stream *s = sd;
int rc;
char *bufp = NULL;
size_t len = 0;
do
{
char buf[80];
size_t sz;
rc = stream_read (s->stream, buf, sizeof (buf), &sz);
if (rc)
{
if (rc == EINTR)
continue;
return rc;
}
rc = _auth_lb_grow (s->lb, buf, sz);
if (rc)
return rc;
rc = gsasl_decode (s->sess_ctx,
_auth_lb_data (s->lb),
_auth_lb_level (s->lb), &bufp, &len);
}
while (rc == GSASL_NEEDS_MORE);
if (rc != GSASL_OK)
return rc;
if (len > size)
{
memcpy (data, bufp, size);
_auth_lb_drop (s->lb);
_auth_lb_grow (s->lb, bufp + size, len - size);
len = size;
}
else
{
_auth_lb_drop (s->lb);
memcpy (data, bufp, len);
}
if (nbytes)
*nbytes = len;
free (bufp);
return 0;
}
static int
_gsasl_close (void *sd)
{
struct anubis_gsasl_stream *s = sd;
stream_close (s->stream);
return 0;
}
static int
_gsasl_destroy (void *sd)
{
struct anubis_gsasl_stream *s = sd;
if (s->sess_ctx)
gsasl_server_finish (s->sess_ctx);
_auth_lb_destroy (&s->lb);
free (sd);
return 0;
}
void
install_gsasl_stream (Gsasl_session_ctx * sess_ctx, NET_STREAM * stream)
{
struct anubis_gsasl_stream *s = xmalloc (sizeof *s);
s->sess_ctx = sess_ctx;
_auth_lb_create (&s->lb);
s->stream = *stream;
stream_create (stream);
stream_set_io (*stream, s,
_gsasl_read, _gsasl_write,
_gsasl_close, _gsasl_destroy, _gsasl_strerror);
}
#endif
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