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
|
/*
* Copyright (c) 2017 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
*/
#include <config.h>
#include <stdio.h>
#include <LongBow/runtime.h>
#include <arpa/inet.h>
#include <ccnx/common/codec/ccnxCodec_TlvPacket.h>
#include <ccnx/common/codec/schema_v1/ccnxCodecSchemaV1_Types.h>
#include <ccnx/common/codec/schema_v1/ccnxCodecSchemaV1_PacketDecoder.h>
#include <ccnx/common/codec/schema_v1/ccnxCodecSchemaV1_PacketEncoder.h>
#include <ccnx/common/codec/schema_v1/ccnxCodecSchemaV1_FixedHeader.h>
static CCNxTlvDictionary *
_decodeV1(PARCBuffer *packetBuffer)
{
CCNxTlvDictionary *packetDictionary = NULL;
CCNxCodecSchemaV1Types_PacketType packetType = (CCNxCodecSchemaV1Types_PacketType) parcBuffer_GetAtIndex(packetBuffer, 1);
switch (packetType) {
case CCNxCodecSchemaV1Types_PacketType_Interest:
packetDictionary = ccnxCodecSchemaV1TlvDictionary_CreateInterest();
break;
case CCNxCodecSchemaV1Types_PacketType_ContentObject:
packetDictionary = ccnxCodecSchemaV1TlvDictionary_CreateContentObject();
break;
case CCNxCodecSchemaV1Types_PacketType_InterestReturn:
// not implemented yet
break;
case CCNxCodecSchemaV1Types_PacketType_Control:
packetDictionary = ccnxCodecSchemaV1TlvDictionary_CreateControl();
break;
default:
// unknown type
break;
}
if (packetDictionary) {
// The packetBuffer may be padded or have extraneous content after the CCNx message.
// Ensure that the buffer limit reflects the CCNx packet length as the decoder uses
// the that limit, not the packetLength from the header, to determine when to stop parsing.
size_t packetBufferLength = ccnxCodecTlvPacket_GetPacketLength(packetBuffer);
assertTrue(packetBufferLength <= parcBuffer_Remaining(packetBuffer), "Short packet buffer");
parcBuffer_SetLimit(packetBuffer, packetBufferLength);
bool success = ccnxCodecSchemaV1PacketDecoder_BufferDecode(packetBuffer, packetDictionary);
if (!success) {
ccnxTlvDictionary_Release(&packetDictionary);
}
}
return packetDictionary;
}
CCNxTlvDictionary *
ccnxCodecTlvPacket_Decode(PARCBuffer *packetBuffer)
{
return _decodeV1(packetBuffer);
}
bool
ccnxCodecTlvPacket_BufferDecode(PARCBuffer *packetBuffer, CCNxTlvDictionary *packetDictionary)
{
// Determine the version from the first byte of the buffer
uint8_t version = parcBuffer_GetAtIndex(packetBuffer, 0);
// The packetBuffer may be padded or have extraneous content after the CCNx message.
// Ensure that the buffer limit reflects the CCNx packet length as the decoder uses
// the that limit, not the packetLength from the header, to determine when to stop parsing.
size_t packetBufferLength = ccnxCodecTlvPacket_GetPacketLength(packetBuffer);
assertTrue(packetBufferLength <= parcBuffer_Remaining(packetBuffer), "Short packet buffer");
parcBuffer_SetLimit(packetBuffer, packetBufferLength);
bool success = false;
switch (version) {
case CCNxTlvDictionary_SchemaVersion_V1:
success = ccnxCodecSchemaV1PacketDecoder_BufferDecode(packetBuffer, packetDictionary);
break;
default:
// will return false
break;
}
return success;
}
/*
* We don't have an iovec based decoder yet, so linearize the memory and use a PARCBuffer
* See case 903.
*/
bool
ccnxCodecTlvPacket_IoVecDecode(CCNxCodecNetworkBufferIoVec *vec, CCNxTlvDictionary *packetDictionary)
{
size_t iovcnt = ccnxCodecNetworkBufferIoVec_GetCount(vec);
const struct iovec *array = ccnxCodecNetworkBufferIoVec_GetArray(vec);
PARCBuffer *buffer = NULL;
if (iovcnt == 1) {
buffer = parcBuffer_Wrap(array[0].iov_base, array[0].iov_len, 0, array[0].iov_len);
} else if (iovcnt > 1) {
// figure out total size, then linearize it
size_t totalbytes = 0;
for (int i = 0; i < iovcnt; i++) {
totalbytes += array[i].iov_len;
}
buffer = parcBuffer_Allocate(totalbytes);
for (int i = 0; i < iovcnt; i++) {
parcBuffer_PutArray(buffer, array[i].iov_len, array[i].iov_base);
}
parcBuffer_Flip(buffer);
} else {
return false;
}
bool success = ccnxCodecTlvPacket_BufferDecode(buffer, packetDictionary);
parcBuffer_Release(&buffer);
return success;
}
CCNxCodecNetworkBufferIoVec *
ccnxCodecTlvPacket_DictionaryEncode(CCNxTlvDictionary *packetDictionary, PARCSigner *signer)
{
CCNxTlvDictionary_SchemaVersion version = ccnxTlvDictionary_GetSchemaVersion(packetDictionary);
CCNxCodecNetworkBufferIoVec *iovec = NULL;
switch (version) {
case CCNxTlvDictionary_SchemaVersion_V1:
iovec = ccnxCodecSchemaV1PacketEncoder_DictionaryEncode(packetDictionary, signer);
break;
default:
// will return NULL
break;
}
return iovec;
}
size_t
ccnxCodecTlvPacket_GetPacketLength(PARCBuffer *packetBuffer)
{
size_t length = 0;
// Determine the version from the first byte of the buffer
uint8_t *header = parcBuffer_Overlay(packetBuffer, 0);
switch (header[0]) {
case CCNxTlvDictionary_SchemaVersion_V1: { // V1 - from metis_TlvSchemaV1.c:_totalPacketLength
CCNxCodecSchemaV1FixedHeader *headerV1 = (CCNxCodecSchemaV1FixedHeader *) header;
length = htons(headerV1->packetLength);
break;
}
default:
break;
}
return length;
}
// When new versions are created they need to be incorporated here so enough header information
// can be read to determine how to proceed.
size_t
ccnxCodecTlvPacket_MinimalHeaderLength()
{
size_t minimumHeaderLength;
minimumHeaderLength = sizeof(CCNxCodecSchemaV1FixedHeader);
return minimumHeaderLength;
}
|
