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
|
/*
* Usurpataion --- clinet-server protocol implementation.
*
* Copyright (C) 2019 Ramūnas Mažeikis
*
* This program 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; version 2.1
* of the License.
*
* 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 program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
/**
* Common parts of protocol implementation. Handling of anything that actually
* deals with connection descriptor has to be implemented by device and daemon
* separately.
*/
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include "protocol.h"
#include "protocol_private.h"
#include "net.h"
#include "utils.h"
#if 0
int tlv_push(struct tlv_packet *packet, enum tlv_type type, char *data)
{
int ret = 0;
size_t size;
switch (type) {
case TEXT:
size = strlen(data) + 1;
break;
case FPI1:
size = sizeof(fpi1_t);
break;
case TIMESTAMP:
size = sizeof(time_t);
break;
case REQUEST:
size = sizeof(msg_idx_t);
break;
case REPLY:
size = sizeof(msg_idx_t) + strlen(data + sizeof(msg_idx_t));
break;
case UUID:
size = sizeof(uuid_t);
break;
default:
ret = E_UNKNOWN_TYPE;
}
ret |= push_tlv_header(packet, type, size);
ret |= push_bytes(packet, data, size);
return ret;
}
#endif
void tlv_clear_data(struct tlv_packet *packet)
{
packet->offset = 0;
packet->type = 0;
memset(packet->data, 0, packet->size);
}
static int push_bytes(struct tlv_packet *packet, char *data, size_t size)
{
int ret = 0;
if (packet->offset + size >= packet->size) {
ret = E_TLV_OVERFLOW;
} else {
memcpy(packet->data + packet->offset, data, size);
packet->offset += size;
}
}
static int push_tlv_header(struct tlv_packet *packet, enum tlv_type type, size_t size)
{
int ret = 0;
if (packet->offset + sizeof(type) + sizeof(size) >= packet->size) {
ret = E_TLV_OVERFLOW;
} else {
memcpy(packet->data + packet->size, type, sizeof(type));
packet->offset += sizeof(type);
memcpy(packet->data + packet->offset, size, sizeof(size));
packet->offset += sizeof(size);
}
return ret;
}
int tlv_get(struct tlv_parser *parser, struct tlv *ret)
{
int ret = 0;
if (parser->offset + sizeof(ret->type) + sizeof(ret->length) >= parser->size) {
ret = E_TLV_OVERFLOW;
} else if (parser -> offset == parser->size) {
ret = END_OF_PACKET;
} else {
ret->type = memcpy(&ret->type, parser->data + parser->offset, sizeof(ret->type));
parser->size += sizeof(ret->type);
ret->length = memcpy(&ret->length, parser->data + parser->offset, sizeof(ret->length));
parser->offset += sizeof(ret->length);
if (parser->offset + ret->length >= parser->size) {
ret = E_TLV_OVERFLOW;
} else {
memcpy(ret->data, parser->data, ret->length);
}
}
return ret;
}
size_t tlv_data_size(struct tlv_parser *parser)
{
size_t size;
if (parser->offset + sizeof(enum tlv_type) + sizeof(size_t) >= parser->size) {
size = 0;
} else {
memcpy(&size, parser->data + parser->offset + sizeof(enum tlv_type), sizeof(size_t));
}
return size;
}
void tlv_destroy(struct tlv *t)
{
free(t->data);
t->length = 0;
}
size_t tlv_raw_size(struct tlv *t)
{
return sizeof(*t) + t->length;
}
int tlv_push(struct tlv *t, const char *data, size_t size)
{
int ret = 0;
size_t final_size = tlv_raw_size(t) + size;
if (final_size > TLV_SZ_MAX_RAW) {
ret = E_TLV_OVERFLOW;
} else {
t->data = realloc(t->data, final_size);
memcpy(t->data + t->length, data, size);
t->length = final_size;
}
return ret;
}
void tlv_init(struct tlv *t, enum tlv_type type)
{
t->type = type;
t->length = 0;
t->data = NULL;
}
|