aboutsummaryrefslogtreecommitdiff
path: root/lib/gsaslstr.c
blob: 8ed3e4366e243558f2763b133db8ffeded6f3a53 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
/* This file is part of GNU Dico.
   Copyright (C) 2008, 2010, 2012 Sergey Poznyakoff

   GNU Dico 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 3, or (at your option)
   any later version.

   GNU Dico 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 Dico.  If not, see <http://www.gnu.org/licenses/>. */

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <dico.h>
#include <libi18n.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <gsasl.h>

#ifdef WITH_GSASL

#define _ERR_SASL 0x1
#define _ERR_TRANSPORT 0x2

struct g_buf {
    char *buffer;
    size_t pos;
    size_t size;
    size_t level;
};

#define g_buf_ptr(p) ((p).buffer + (p).pos)
#define g_buf_level(p) ((p).level - (p).pos)
#define g_buf_drop(p) (p).level = (p).pos = 0
#define g_buf_free(p) free((p).buffer)
#define g_buf_advance(p, s)			\
    do {					\
	if (((p).pos += s) >= (p).level)	\
	    g_buf_drop(p);			\
    } while (0)

int
g_buf_grow(struct g_buf *pb, const char *ptr, size_t size)
{
    if (!pb->buffer) {
	pb->buffer = malloc(size);
	pb->size = size;
	pb->level = 0;
    } else if (pb->size - pb->level < size) {
	size_t newsize = pb->size + size;
	pb->buffer = realloc(pb->buffer, newsize);
	if (pb->buffer)
	    pb->size = newsize;
    }

    if (!pb->buffer)
	return 1;

    memcpy(pb->buffer + pb->level, ptr, size);
    pb->level += size;
    return 0;
}

struct _gsasl_str {
    Gsasl_session *sess; /* Session context */
    int last_err;        /* Last GSASL error code */
    int errflag;
    dico_stream_t transport;
    struct g_buf buf;
};

#define set_error(s, flag, code)		\
    do {					\
	(s)->last_err = code;			\
	(s)->errflag = flag;			\
    } while (0)

static int
_gsasl_read(void *data, char *buf, size_t size, size_t *pret)
{
    struct _gsasl_str *s = data;
    int rc;
    size_t len;
    char *bufp = NULL;
  
    if ((len = g_buf_level(s->buf))) {
	if (len > size)
	    len = size;
	memcpy(buf, g_buf_ptr(s->buf), len);
	g_buf_advance(s->buf, len);
	if (pret)
	    *pret = len;
	return 0;
    }

    do {
	char tmp[80];
	size_t sz;
	int status;
	
	status = dico_stream_read(s->transport, tmp, sizeof(tmp), &sz);
	if (status == EINTR)
	    continue;
	else if (status) {
	    free (bufp);
	    return status;
	}
	rc = g_buf_grow(&s->buf, tmp, sz);
	if (rc)
	    return rc;

	rc = gsasl_decode(s->sess,
			  g_buf_ptr(s->buf),
			  g_buf_level(s->buf),
			  &bufp, &len);
    } while (rc == GSASL_NEEDS_MORE);

    if (rc != GSASL_OK) {
	set_error(s, _ERR_SASL, rc);
	free(bufp);
	errno = EIO;
	return 1;
    }
      
    g_buf_drop(s->buf);
    if (len > size) {
	memcpy(buf, bufp, size);
	g_buf_grow(&s->buf, bufp + size, len - size);
	len = size;
    } else {
	memcpy(buf, bufp, len);
    }

    if (pret)
	*pret = len;
  
    free(bufp);
    return 0;
}

static int
_gsasl_write(void *data, const char *buf, size_t size, size_t *pret)
{
    struct _gsasl_str *s = data;
    char *obuf = NULL;
    size_t olen = 0;
    
    int rc = gsasl_encode(s->sess, buf, size, &obuf, &olen);
    if (rc != GSASL_OK) {
	set_error(s, _ERR_SASL, rc);
	errno = EIO;
	return 1;
    }
    rc = dico_stream_write(s->transport, obuf, olen);
    free(obuf);
    if (rc) {
	set_error(s, _ERR_TRANSPORT, errno);
	return 1;
    }
    if (pret)
	*pret = olen;
    return 0;
}

static int
_gsasl_destroy(void *data)
{
    struct _gsasl_str *s = data;
    g_buf_free(s->buf);
    dico_stream_destroy(&s->transport);
    return 0;
}

/*
  FIXME:
static const char *
_gsasl_error_string(void *data, int code)
{
    
}
*/

static int
_gsasl_flush(void *data)
{
    struct _gsasl_str *s = data;
    return dico_stream_flush(s->transport);
}

static int
_gsasl_close(void *data)
{
    struct _gsasl_str *s = data;
    return dico_stream_close(s->transport);
}

static int
_gsasl_ioctl(void *data, int code, void *call_data)
{
    struct _gsasl_str *s = data;
    
    switch (code) {
    case DICO_IOCTL_GET_TRANSPORT:
	*(dico_stream_t*)call_data = s->transport;
	break;

    case DICO_IOCTL_SET_TRANSPORT:
	s->transport = call_data;
	break;

    case DICO_IOCTL_BYTES_IN:
	*(off_t*)call_data = dico_stream_bytes_in(s->transport);
	break;

    case DICO_IOCTL_BYTES_OUT:
	*(off_t*)call_data = dico_stream_bytes_out(s->transport);
	break;
	
    default:
	errno = EINVAL;
	return -1;
    }
    return 0;
}

dico_stream_t
dico_gsasl_stream(Gsasl_session *sess, dico_stream_t transport)
{
    int rc;
    struct _gsasl_str *s;
    dico_stream_t str;

    s = malloc(sizeof(*s));
    if (!s)
	return NULL;
    memset(s, 0, sizeof(*s));
    rc = dico_stream_create(&str, DICO_STREAM_READ|DICO_STREAM_WRITE, s);
    if (rc) {
	free(s);
	return NULL;
    }
    s->sess = sess;
    s->transport = transport;
    dico_stream_set_write(str, _gsasl_write);
    dico_stream_set_read(str, _gsasl_read);
    dico_stream_set_flush(str, _gsasl_flush);
    dico_stream_set_close(str, _gsasl_close);
    dico_stream_set_destroy(str, _gsasl_destroy);
    dico_stream_set_ioctl(str, _gsasl_ioctl);
    dico_stream_set_buffer(str, dico_buffer_line, 1024);
    return str;
}

int
insert_gsasl_stream(Gsasl_session *sess, dico_stream_t *pstr)
{
    int rc;
    dico_stream_t gsasl_str;
    dico_stream_t str = *pstr;
    dico_stream_t prev = NULL, s;
    
    while ((rc = dico_stream_ioctl(str, DICO_IOCTL_GET_TRANSPORT, &s)) == 0
	   && s) {
	prev = str;
	str = s;
    }
    if (rc && errno != EINVAL && errno != ENOSYS) {
	dico_log(L_ERR, errno, _("Cannot get transport stream"));
	return rc;
    }
    if (!str) {
	dico_log(L_ERR, 0, _("Cannot get transport stream"));
	return 1;
    }

    gsasl_str = dico_gsasl_stream(sess, str);
    if (!gsasl_str) {
	dico_log(L_ERR, errno, _("Cannot create GSASL stream"));
	return 1;
    }
    
    if (!prev)
	*pstr = gsasl_str;
    else if (dico_stream_ioctl(prev, DICO_IOCTL_SET_TRANSPORT, gsasl_str)) {
	dico_log(L_ERR, errno, _("Cannot install GSASL stream"));
	return 1;
    }
    return 0;
}

#endif

Return to:

Send suggestions and report system problems to the System administrator.