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
|
/*
en50221 encoder An implementation for libdvb
an implementation for the en50221 transport layer
Copyright (C) 2004, 2005 Manu Abraham <abraham.manu@gmail.com>
Copyright (C) 2005 Julian Scheel (julian at jusst dot de)
Copyright (C) 2006 Andrew de Quincey (adq_dvb@lidskialf.net)
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 2.1 of
the License, or (at your option) any later version.
This program 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 this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <string.h>
#include <libdvbmisc/dvbmisc.h>
#include <pthread.h>
#include "en50221_app_auth.h"
#include "en50221_app_tags.h"
#include "asn_1.h"
struct en50221_app_auth {
struct en50221_app_send_functions *funcs;
en50221_app_auth_request_callback callback;
void *callback_arg;
pthread_mutex_t lock;
};
static int en50221_app_auth_parse_request(struct en50221_app_auth *private,
uint8_t slot_id,
uint16_t session_number,
uint8_t * data,
uint32_t data_length);
struct en50221_app_auth *en50221_app_auth_create(struct en50221_app_send_functions *funcs)
{
struct en50221_app_auth *auth = NULL;
// create structure and set it up
auth = malloc(sizeof(struct en50221_app_auth));
if (auth == NULL) {
return NULL;
}
auth->funcs = funcs;
auth->callback = NULL;
pthread_mutex_init(&auth->lock, NULL);
// done
return auth;
}
void en50221_app_auth_destroy(struct en50221_app_auth *auth)
{
pthread_mutex_destroy(&auth->lock);
free(auth);
}
void en50221_app_auth_register_request_callback(struct en50221_app_auth *auth,
en50221_app_auth_request_callback callback, void *arg)
{
pthread_mutex_lock(&auth->lock);
auth->callback = callback;
auth->callback_arg = arg;
pthread_mutex_unlock(&auth->lock);
}
int en50221_app_auth_send(struct en50221_app_auth *auth,
uint16_t session_number,
uint16_t auth_protocol_id, uint8_t * auth_data,
uint32_t auth_data_length)
{
uint8_t buf[10];
// the header
buf[0] = (TAG_AUTH_RESP >> 16) & 0xFF;
buf[1] = (TAG_AUTH_RESP >> 8) & 0xFF;
buf[2] = TAG_AUTH_RESP & 0xFF;
// encode the length field
int length_field_len;
if ((length_field_len = asn_1_encode(auth_data_length + 2, buf + 3, 3)) < 0) {
return -1;
}
// the phase_id
buf[3 + length_field_len] = auth_protocol_id >> 8;
buf[3 + length_field_len + 1] = auth_protocol_id;
// build the iovecs
struct iovec iov[2];
iov[0].iov_base = buf;
iov[0].iov_len = 3 + length_field_len + 2;
iov[1].iov_base = auth_data;
iov[1].iov_len = auth_data_length;
// sendit
return auth->funcs->send_datav(auth->funcs->arg, session_number,
iov, 2);
}
int en50221_app_auth_message(struct en50221_app_auth *auth,
uint8_t slot_id,
uint16_t session_number,
uint32_t resource_id,
uint8_t * data, uint32_t data_length)
{
(void) resource_id;
// get the tag
if (data_length < 3) {
print(LOG_LEVEL, ERROR, 1, "Received short data\n");
return -1;
}
uint32_t tag = (data[0] << 16) | (data[1] << 8) | data[2];
switch (tag) {
case TAG_AUTH_REQ:
return en50221_app_auth_parse_request(auth, slot_id,
session_number,
data + 3,
data_length - 3);
}
print(LOG_LEVEL, ERROR, 1, "Received unexpected tag %x\n", tag);
return -1;
}
static int en50221_app_auth_parse_request(struct en50221_app_auth *auth,
uint8_t slot_id,
uint16_t session_number,
uint8_t * data,
uint32_t data_length)
{
// first of all, decode the length field
uint16_t asn_data_length;
int length_field_len;
if ((length_field_len = asn_1_decode(&asn_data_length, data, data_length)) < 0) {
print(LOG_LEVEL, ERROR, 1, "ASN.1 decode error\n");
return -1;
}
// check it
if (asn_data_length < 2) {
print(LOG_LEVEL, ERROR, 1, "Received short data\n");
return -1;
}
if (asn_data_length > (data_length - length_field_len)) {
print(LOG_LEVEL, ERROR, 1, "Received short data\n");
return -1;
}
uint8_t *auth_data = data + length_field_len;
// process it
uint16_t auth_protocol_id = (auth_data[0] << 8) | auth_data[1];
// tell the app
pthread_mutex_lock(&auth->lock);
en50221_app_auth_request_callback cb = auth->callback;
void *cb_arg = auth->callback_arg;
pthread_mutex_unlock(&auth->lock);
if (cb) {
return cb(cb_arg, slot_id, session_number,
auth_protocol_id, auth_data + 2,
asn_data_length - 2);
}
return 0;
}
|
