|
1 /* |
|
2 * Copyright 2006 Intel Corporation |
|
3 * |
|
4 * Licensed under the Apache License, Version 2.0 (the "License"); |
|
5 * you may not use this file except in compliance with the License. |
|
6 * You may obtain a copy of the License at |
|
7 * |
|
8 * http://www.apache.org/licenses/LICENSE-2.0 |
|
9 * |
|
10 * Unless required by applicable law or agreed to in writing, software |
|
11 * distributed under the License is distributed on an "AS IS" BASIS, |
|
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
|
13 * See the License for the specific language governing permissions and |
|
14 * limitations under the License. |
|
15 */ |
|
16 |
|
17 #ifdef HAVE_CONFIG_H |
|
18 # include <dtn-config.h> |
|
19 #endif |
|
20 |
|
21 #include "UnknownBlockProcessor.h" |
|
22 |
|
23 #include "BlockInfo.h" |
|
24 #include "BundleProtocol.h" |
|
25 #include "Bundle.h" |
|
26 |
|
27 namespace dtn { |
|
28 |
|
29 template <> UnknownBlockProcessor* |
|
30 oasys::Singleton<UnknownBlockProcessor>::instance_ = NULL; |
|
31 |
|
32 //---------------------------------------------------------------------- |
|
33 UnknownBlockProcessor::UnknownBlockProcessor() |
|
34 : BlockProcessor(BundleProtocol::UNKNOWN_BLOCK) |
|
35 // typecode is ignored for this processor |
|
36 // pl -- this raises the interesting situation where |
|
37 // source->type() returns the actual type, and |
|
38 // source->owner_->block_type() will return UNKNOWN_BLOCK |
|
39 { |
|
40 } |
|
41 |
|
42 //---------------------------------------------------------------------- |
|
43 int |
|
44 UnknownBlockProcessor::prepare(const Bundle* bundle, |
|
45 BlockInfoVec* xmit_blocks, |
|
46 const BlockInfo* source, |
|
47 const LinkRef& link, |
|
48 list_owner_t list) |
|
49 { |
|
50 ASSERT(source != NULL); |
|
51 ASSERT(source->owner() == this); |
|
52 |
|
53 if (source->flags() & BundleProtocol::BLOCK_FLAG_DISCARD_BLOCK_ONERROR) { |
|
54 return BP_FAIL; |
|
55 } |
|
56 |
|
57 // If we're called for this type then security is not enabled |
|
58 // and we should NEVER forward BAB |
|
59 if (source->type() == BundleProtocol::BUNDLE_AUTHENTICATION_BLOCK) { |
|
60 return BP_FAIL; |
|
61 } |
|
62 |
|
63 return BlockProcessor::prepare(bundle, xmit_blocks, source, link, list); |
|
64 } |
|
65 |
|
66 //---------------------------------------------------------------------- |
|
67 int |
|
68 UnknownBlockProcessor::generate(const Bundle* bundle, |
|
69 BlockInfoVec* xmit_blocks, |
|
70 BlockInfo* block, |
|
71 const LinkRef& link, |
|
72 bool last) |
|
73 { |
|
74 (void)bundle; |
|
75 (void)link; |
|
76 (void)xmit_blocks; |
|
77 |
|
78 // This can only be called if there was a corresponding block in |
|
79 // the input path |
|
80 const BlockInfo* source = block->source(); |
|
81 ASSERT(source != NULL); |
|
82 ASSERT(source->owner() == this); |
|
83 |
|
84 // We shouldn't be here if the block has the following flags set |
|
85 ASSERT((source->flags() & |
|
86 BundleProtocol::BLOCK_FLAG_DISCARD_BUNDLE_ONERROR) == 0); |
|
87 ASSERT((source->flags() & |
|
88 BundleProtocol::BLOCK_FLAG_DISCARD_BLOCK_ONERROR) == 0); |
|
89 |
|
90 // The source better have some contents, but doesn't need to have |
|
91 // any data necessarily |
|
92 ASSERT(source->contents().len() != 0); |
|
93 ASSERT(source->data_offset() != 0); |
|
94 |
|
95 u_int8_t flags = source->flags(); |
|
96 if (last) { |
|
97 flags |= BundleProtocol::BLOCK_FLAG_LAST_BLOCK; |
|
98 } else { |
|
99 flags &= ~BundleProtocol::BLOCK_FLAG_LAST_BLOCK; |
|
100 } |
|
101 flags |= BundleProtocol::BLOCK_FLAG_FORWARDED_UNPROCESSED; |
|
102 |
|
103 block->set_eid_list(source->eid_list()); |
|
104 |
|
105 generate_preamble(xmit_blocks, block, source->type(), flags, |
|
106 source->data_length()); |
|
107 ASSERT(block->data_length() == source->data_length()); |
|
108 |
|
109 BlockInfo::DataBuffer* contents = block->writable_contents(); |
|
110 contents->reserve(block->full_length()); |
|
111 memcpy(contents->buf() + block->data_offset(), |
|
112 source->contents().buf() + source->data_offset(), |
|
113 block->data_length()); |
|
114 contents->set_len(block->full_length()); |
|
115 |
|
116 return BP_SUCCESS; |
|
117 } |
|
118 |
|
119 //---------------------------------------------------------------------- |
|
120 bool |
|
121 UnknownBlockProcessor::validate(const Bundle* bundle, |
|
122 BlockInfoVec* block_list, |
|
123 BlockInfo* block, |
|
124 status_report_reason_t* reception_reason, |
|
125 status_report_reason_t* deletion_reason) |
|
126 { |
|
127 // check for generic block errors |
|
128 if (!BlockProcessor::validate(bundle, block_list, block, |
|
129 reception_reason, deletion_reason)) { |
|
130 return false; |
|
131 } |
|
132 |
|
133 // extension blocks of unknown type are considered to be "invalid" |
|
134 if (block->flags() & BundleProtocol::BLOCK_FLAG_REPORT_ONERROR) { |
|
135 *reception_reason = BundleProtocol::REASON_BLOCK_UNINTELLIGIBLE; |
|
136 } |
|
137 |
|
138 if (block->flags() & BundleProtocol::BLOCK_FLAG_DISCARD_BUNDLE_ONERROR) { |
|
139 *deletion_reason = BundleProtocol::REASON_BLOCK_UNINTELLIGIBLE; |
|
140 return false; |
|
141 } |
|
142 |
|
143 return true; |
|
144 } |
|
145 |
|
146 } // namespace dtn |