AnnounceBundle.cc

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00001 /*
00002  *    Copyright 2006 Intel Corporation
00003  * 
00004  *    Licensed under the Apache License, Version 2.0 (the "License");
00005  *    you may not use this file except in compliance with the License.
00006  *    You may obtain a copy of the License at
00007  * 
00008  *        http://www.apache.org/licenses/LICENSE-2.0
00009  * 
00010  *    Unless required by applicable law or agreed to in writing, software
00011  *    distributed under the License is distributed on an "AS IS" BASIS,
00012  *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00013  *    See the License for the specific language governing permissions and
00014  *    limitations under the License.
00015  */
00016 
00017 #include <oasys/util/ScratchBuffer.h>
00018 #include "AnnounceBundle.h"
00019 #include "BundleProtocol.h"
00020 
00021 namespace dtn {
00022 
00023 void
00024 AnnounceBundle::create_announce_bundle(Bundle* announce,
00025                                        const EndpointID& route_eid)
00026 {
00027     // only meant for DTN admin consumption
00028     announce->is_admin_ = true;
00029 
00030     // assign router's local EID as bundle source
00031     announce->source_.assign(route_eid);
00032 
00033     // null out the rest
00034     announce->dest_.assign(EndpointID::NULL_EID());
00035     announce->replyto_.assign(EndpointID::NULL_EID());
00036     announce->custodian_.assign(EndpointID::NULL_EID());
00037 
00038     // non-zero expire time
00039     announce->expiration_ = 3600;
00040 
00041     // one byte payload:  admin type
00042     u_char buf = (BundleProtocol::ADMIN_ANNOUNCE << 4);
00043     announce->payload_.set_data(&buf,1);
00044 }
00045 
00046 bool
00047 AnnounceBundle::parse_announce_bundle(Bundle* bundle,
00048                                       EndpointID *route_eid)
00049 {
00050     if (bundle->is_admin_ == false)
00051         return false;
00052 
00053     size_t payload_len = bundle->payload_.length();
00054     if (payload_len <= 0) return false;
00055 
00056     oasys::ScratchBuffer<u_char*, 256> scratch(payload_len);
00057     const u_char* payload_buf =
00058             bundle->payload_.read_data(0, payload_len, scratch.buf(payload_len));
00059 
00060     if ((*payload_buf >> 4) == BundleProtocol::ADMIN_ANNOUNCE) {
00061 
00062         if(route_eid != NULL)
00063             route_eid->assign(bundle->source_);
00064 
00065         return true;
00066     }
00067 
00068     return false;
00069 }
00070 
00071 } // dtn

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