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<h1>IPDiscovery.cc</h1><a href="IPDiscovery_8cc.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*</span>
<a name="l00002"></a>00002 <span class="comment"> * Copyright 2006 Baylor University</span>
<a name="l00003"></a>00003 <span class="comment"> * </span>
<a name="l00004"></a>00004 <span class="comment"> * Licensed under the Apache License, Version 2.0 (the "License");</span>
<a name="l00005"></a>00005 <span class="comment"> * you may not use this file except in compliance with the License.</span>
<a name="l00006"></a>00006 <span class="comment"> * You may obtain a copy of the License at</span>
<a name="l00007"></a>00007 <span class="comment"> * </span>
<a name="l00008"></a>00008 <span class="comment"> * http://www.apache.org/licenses/LICENSE-2.0</span>
<a name="l00009"></a>00009 <span class="comment"> * </span>
<a name="l00010"></a>00010 <span class="comment"> * Unless required by applicable law or agreed to in writing, software</span>
<a name="l00011"></a>00011 <span class="comment"> * distributed under the License is distributed on an "AS IS" BASIS,</span>
<a name="l00012"></a>00012 <span class="comment"> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span>
<a name="l00013"></a>00013 <span class="comment"> * See the License for the specific language governing permissions and</span>
<a name="l00014"></a>00014 <span class="comment"> * limitations under the License.</span>
<a name="l00015"></a>00015 <span class="comment"> */</span>
<a name="l00016"></a>00016
<a name="l00017"></a>00017 <span class="preprocessor">#ifdef HAVE_CONFIG_H</span>
<a name="l00018"></a>00018 <span class="preprocessor"></span><span class="preprocessor"># include <<a class="code" href="dtn-config_8h.html">dtn-config.h</a>></span>
<a name="l00019"></a>00019 <span class="preprocessor">#endif</span>
<a name="l00020"></a>00020 <span class="preprocessor"></span>
<a name="l00021"></a>00021 <span class="preprocessor">#include <climits></span>
<a name="l00022"></a>00022
<a name="l00023"></a>00023 <span class="preprocessor">#include <oasys/util/OptParser.h></span>
<a name="l00024"></a>00024 <span class="preprocessor">#include <oasys/util/StringBuffer.h></span>
<a name="l00025"></a>00025 <span class="preprocessor">#include "<a class="code" href="BundleDaemon_8h.html">bundling/BundleDaemon.h</a>"</span>
<a name="l00026"></a>00026 <span class="preprocessor">#include "<a class="code" href="IPDiscovery_8h.html">IPDiscovery.h</a>"</span>
<a name="l00027"></a>00027 <span class="preprocessor">#include "<a class="code" href="IPAnnounce_8h.html">IPAnnounce.h</a>"</span>
<a name="l00028"></a>00028
<a name="l00029"></a>00029 <span class="keyword">extern</span> <span class="keywordtype">int</span> <a class="code" href="IPDiscovery_8cc.html#d65a8842cc674e3ddf69355898c0ecbf">errno</a>;
<a name="l00030"></a>00030
<a name="l00031"></a>00031 <span class="keyword">namespace </span>dtn {
<a name="l00032"></a>00032
<a name="l00033"></a>00033 <span class="keyword">const</span> u_int32_t <a class="code" href="classdtn_1_1IPDiscovery.html#545fd19e7aaca3eab08b4ff279fc63b4" title="If no other options are set for destination, default to sending to the IPv4 broadcast...">IPDiscovery::DEFAULT_DST_ADDR</a> = 0xffffffff;
<a name="l00034"></a>00034 <span class="keyword">const</span> u_int32_t <a class="code" href="classdtn_1_1IPDiscovery.html#7f1787a9f154ff88952209924f02e273" title="If no other options are set for source, use this as default local address.">IPDiscovery::DEFAULT_SRC_ADDR</a> = INADDR_ANY;
<a name="l00035"></a>00035 <span class="keyword">const</span> u_int <a class="code" href="classdtn_1_1IPDiscovery.html#dacf3f66ee13744990d8cb0c54c37585" title="If no other options are set for multicast TTL, set to 1.">IPDiscovery::DEFAULT_MCAST_TTL</a> = 1;
<a name="l00036"></a>00036
<a name="l00037"></a><a class="code" href="classdtn_1_1IPDiscovery.html#ac1eecdacc9c8cc817b1fe781d4b8310">00037</a> <a class="code" href="classdtn_1_1IPDiscovery.html#ac1eecdacc9c8cc817b1fe781d4b8310">IPDiscovery::IPDiscovery</a>(<span class="keyword">const</span> std::string& name)
<a name="l00038"></a>00038 : <a class="code" href="classdtn_1_1Discovery.html" title="Abstraction of neighbor discovery agent.">Discovery</a>(name,<span class="stringliteral">"ip"</span>),
<a name="l00039"></a>00039 oasys::Thread(<span class="stringliteral">"IPDiscovery"</span>),
<a name="l00040"></a>00040 socket_(<span class="stringliteral">"/dtn/discovery/ip/sock"</span>)
<a name="l00041"></a>00041 {
<a name="l00042"></a>00042 <a class="code" href="classdtn_1_1IPDiscovery.html#92c069ec1b1e15bad6cf52d926442213" title="whether unicast, multicast, or broadcast">remote_addr_</a> = <a class="code" href="classdtn_1_1IPDiscovery.html#545fd19e7aaca3eab08b4ff279fc63b4" title="If no other options are set for destination, default to sending to the IPv4 broadcast...">DEFAULT_DST_ADDR</a>;
<a name="l00043"></a>00043 <a class="code" href="classdtn_1_1IPDiscovery.html#45216229a536034944802a1bf0e3f866" title="address for bind() to receive beacons">local_addr_</a> = <a class="code" href="classdtn_1_1IPDiscovery.html#7f1787a9f154ff88952209924f02e273" title="If no other options are set for source, use this as default local address.">DEFAULT_SRC_ADDR</a>;
<a name="l00044"></a>00044 <a class="code" href="classdtn_1_1IPDiscovery.html#83213d3cb154802ff76e9b07763b95d3" title="TTL hop count for multicast option.">mcast_ttl_</a> = <a class="code" href="classdtn_1_1IPDiscovery.html#dacf3f66ee13744990d8cb0c54c37585" title="If no other options are set for multicast TTL, set to 1.">DEFAULT_MCAST_TTL</a>;
<a name="l00045"></a>00045 <a class="code" href="classdtn_1_1IPDiscovery.html#54a253ff502020915fa2521ca9a83e3e" title="local and remote">port_</a> = 0;
<a name="l00046"></a>00046 <a class="code" href="classdtn_1_1IPDiscovery.html#004f9f774345cd25eb73ea4558b86bd7" title="signal to close down thread">shutdown_</a> = <span class="keyword">false</span>;
<a name="l00047"></a>00047 <a class="code" href="classdtn_1_1IPDiscovery.html#18f8ef2702f024cdc5a87cbc2e676b74" title="whether to exit thread on send/recv failures">persist_</a> = <span class="keyword">false</span>;
<a name="l00048"></a>00048 }
<a name="l00049"></a>00049
<a name="l00050"></a>00050 <span class="keywordtype">bool</span>
<a name="l00051"></a><a class="code" href="classdtn_1_1IPDiscovery.html#3705ccea8c5e02f26aa9082a0bcca0c8">00051</a> IPDiscovery::configure(<span class="keywordtype">int</span> argc, <span class="keyword">const</span> <span class="keywordtype">char</span>* argv[])
<a name="l00052"></a>00052 {
<a name="l00053"></a>00053 <span class="keywordflow">if</span> (oasys::Thread::started())
<a name="l00054"></a>00054 {
<a name="l00055"></a>00055 log_warn(<span class="stringliteral">"reconfiguration of IPDiscovery not supported"</span>);
<a name="l00056"></a>00056 <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00057"></a>00057 }
<a name="l00058"></a>00058
<a name="l00059"></a>00059 oasys::OptParser p;
<a name="l00060"></a>00060
<a name="l00061"></a>00061 <span class="keywordtype">bool</span> portSet = <span class="keyword">false</span>;
<a name="l00062"></a>00062 <span class="keywordtype">bool</span> unicast = <span class="keyword">false</span>;
<a name="l00063"></a>00063 p.addopt(<span class="keyword">new</span> oasys::UInt16Opt(<span class="stringliteral">"port"</span>,&<a class="code" href="classdtn_1_1IPDiscovery.html#54a253ff502020915fa2521ca9a83e3e" title="local and remote">port_</a>,<span class="stringliteral">""</span>,<span class="stringliteral">""</span>,&portSet));
<a name="l00064"></a>00064 p.addopt(<span class="keyword">new</span> oasys::InAddrOpt(<span class="stringliteral">"addr"</span>,&<a class="code" href="classdtn_1_1IPDiscovery.html#92c069ec1b1e15bad6cf52d926442213" title="whether unicast, multicast, or broadcast">remote_addr_</a>));
<a name="l00065"></a>00065 p.addopt(<span class="keyword">new</span> oasys::InAddrOpt(<span class="stringliteral">"local_addr"</span>,&<a class="code" href="classdtn_1_1IPDiscovery.html#45216229a536034944802a1bf0e3f866" title="address for bind() to receive beacons">local_addr_</a>));
<a name="l00066"></a>00066 p.addopt(<span class="keyword">new</span> oasys::UIntOpt(<span class="stringliteral">"multicast_ttl"</span>,&<a class="code" href="classdtn_1_1IPDiscovery.html#83213d3cb154802ff76e9b07763b95d3" title="TTL hop count for multicast option.">mcast_ttl_</a>));
<a name="l00067"></a>00067 p.addopt(<span class="keyword">new</span> oasys::BoolOpt(<span class="stringliteral">"unicast"</span>,&unicast));
<a name="l00068"></a>00068 p.addopt(<span class="keyword">new</span> oasys::BoolOpt(<span class="stringliteral">"continue_on_error"</span>,&<a class="code" href="classdtn_1_1IPDiscovery.html#18f8ef2702f024cdc5a87cbc2e676b74" title="whether to exit thread on send/recv failures">persist_</a>));
<a name="l00069"></a>00069
<a name="l00070"></a>00070 <span class="keyword">const</span> <span class="keywordtype">char</span>* invalid;
<a name="l00071"></a>00071 <span class="keywordflow">if</span> (! p.parse(argc,argv,&invalid))
<a name="l00072"></a>00072 {
<a name="l00073"></a>00073 log_err(<span class="stringliteral">"bad option for IP discovery: %s"</span>,invalid);
<a name="l00074"></a>00074 <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00075"></a>00075 }
<a name="l00076"></a>00076
<a name="l00077"></a>00077 <span class="keywordflow">if</span> (! portSet)
<a name="l00078"></a>00078 {
<a name="l00079"></a>00079 log_err(<span class="stringliteral">"must specify port"</span>);
<a name="l00080"></a>00080 <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00081"></a>00081 }
<a name="l00082"></a>00082
<a name="l00083"></a>00083 <a class="code" href="classdtn_1_1IPDiscovery.html#d2d28582fc8830ca107cc07aa9b79a5e" title="the socket for beacons in- and out-bound">socket_</a>.set_remote_addr(<a class="code" href="classdtn_1_1IPDiscovery.html#92c069ec1b1e15bad6cf52d926442213" title="whether unicast, multicast, or broadcast">remote_addr_</a>);
<a name="l00084"></a>00084
<a name="l00085"></a>00085 <span class="comment">// Assume everything is broadcast unless unicast flag is set or if</span>
<a name="l00086"></a>00086 <span class="comment">// the remote address is a multicast address</span>
<a name="l00087"></a>00087 <span class="keyword">static</span> in_addr_t mcast_mask = inet_addr(<span class="stringliteral">"224.0.0.0"</span>);
<a name="l00088"></a>00088 <span class="keywordflow">if</span> (unicast)
<a name="l00089"></a>00089 {
<a name="l00090"></a>00090 log_debug(<span class="stringliteral">"configuring unicast socket for address %s"</span>, intoa(<a class="code" href="classdtn_1_1IPDiscovery.html#92c069ec1b1e15bad6cf52d926442213" title="whether unicast, multicast, or broadcast">remote_addr_</a>));
<a name="l00091"></a>00091 }
<a name="l00092"></a>00092 <span class="keywordflow">else</span> <span class="keywordflow">if</span> ((<a class="code" href="classdtn_1_1IPDiscovery.html#92c069ec1b1e15bad6cf52d926442213" title="whether unicast, multicast, or broadcast">remote_addr_</a> == 0xffffffff) ||
<a name="l00093"></a>00093 ((<a class="code" href="classdtn_1_1IPDiscovery.html#92c069ec1b1e15bad6cf52d926442213" title="whether unicast, multicast, or broadcast">remote_addr_</a> & mcast_mask) != mcast_mask))
<a name="l00094"></a>00094 {
<a name="l00095"></a>00095 log_debug(<span class="stringliteral">"configuring broadcast socket for address %s"</span>, intoa(<a class="code" href="classdtn_1_1IPDiscovery.html#92c069ec1b1e15bad6cf52d926442213" title="whether unicast, multicast, or broadcast">remote_addr_</a>));
<a name="l00096"></a>00096 <a class="code" href="classdtn_1_1IPDiscovery.html#d2d28582fc8830ca107cc07aa9b79a5e" title="the socket for beacons in- and out-bound">socket_</a>.params_.broadcast_ = <span class="keyword">true</span>;
<a name="l00097"></a>00097 }
<a name="l00098"></a>00098 <span class="keywordflow">else</span>
<a name="l00099"></a>00099 {
<a name="l00100"></a>00100 log_debug(<span class="stringliteral">"configuring multicast socket for address %s"</span>, intoa(<a class="code" href="classdtn_1_1IPDiscovery.html#92c069ec1b1e15bad6cf52d926442213" title="whether unicast, multicast, or broadcast">remote_addr_</a>));
<a name="l00101"></a>00101 <a class="code" href="classdtn_1_1IPDiscovery.html#d2d28582fc8830ca107cc07aa9b79a5e" title="the socket for beacons in- and out-bound">socket_</a>.params_.multicast_ = <span class="keyword">true</span>;
<a name="l00102"></a>00102 <a class="code" href="classdtn_1_1IPDiscovery.html#d2d28582fc8830ca107cc07aa9b79a5e" title="the socket for beacons in- and out-bound">socket_</a>.params_.mcast_ttl_ = <a class="code" href="classdtn_1_1IPDiscovery.html#83213d3cb154802ff76e9b07763b95d3" title="TTL hop count for multicast option.">mcast_ttl_</a>;
<a name="l00103"></a>00103 }
<a name="l00104"></a>00104
<a name="l00105"></a>00105 <span class="comment">// allow new announce registration to upset poll() in run() below</span>
<a name="l00106"></a>00106 <a class="code" href="classdtn_1_1IPDiscovery.html#d2d28582fc8830ca107cc07aa9b79a5e" title="the socket for beacons in- and out-bound">socket_</a>.set_notifier(<span class="keyword">new</span> oasys::Notifier(<a class="code" href="classdtn_1_1IPDiscovery.html#d2d28582fc8830ca107cc07aa9b79a5e" title="the socket for beacons in- and out-bound">socket_</a>.logpath()));
<a name="l00107"></a>00107
<a name="l00108"></a>00108 <span class="comment">// configure base class variables </span>
<a name="l00109"></a>00109 oasys::StringBuffer <a class="code" href="num2sdnv_8c.html#a81cdcc7ff6987bc85c073253e32715f">buf</a>(<span class="stringliteral">"%s:%d"</span>,intoa(<a class="code" href="classdtn_1_1IPDiscovery.html#45216229a536034944802a1bf0e3f866" title="address for bind() to receive beacons">local_addr_</a>),<a class="code" href="classdtn_1_1IPDiscovery.html#54a253ff502020915fa2521ca9a83e3e" title="local and remote">port_</a>);
<a name="l00110"></a>00110 <a class="code" href="classdtn_1_1Discovery.html#f969a96a14aed8cad5b8cf6a8e47f6cd" title="address of beacon listener">local_</a>.assign(buf.c_str());
<a name="l00111"></a>00111
<a name="l00112"></a>00112 oasys::StringBuffer to(<span class="stringliteral">"%s:%d"</span>,intoa(<a class="code" href="classdtn_1_1IPDiscovery.html#92c069ec1b1e15bad6cf52d926442213" title="whether unicast, multicast, or broadcast">remote_addr_</a>),<a class="code" href="classdtn_1_1IPDiscovery.html#54a253ff502020915fa2521ca9a83e3e" title="local and remote">port_</a>);
<a name="l00113"></a>00113 <a class="code" href="classdtn_1_1Discovery.html#57590a19bd9c6b2502d336e5d6ac1f2f" title="outbound address of advertisements sent">to_addr_</a>.assign(to.c_str());
<a name="l00114"></a>00114
<a name="l00115"></a>00115 log_debug(<span class="stringliteral">"starting thread"</span>);
<a name="l00116"></a>00116 start();
<a name="l00117"></a>00117
<a name="l00118"></a>00118 <span class="keywordflow">return</span> <span class="keyword">true</span>;
<a name="l00119"></a>00119 }
<a name="l00120"></a>00120
<a name="l00121"></a>00121 <span class="keywordtype">void</span>
<a name="l00122"></a><a class="code" href="classdtn_1_1IPDiscovery.html#4ba6e7fe4ee9f19945b4c1aaf7d7ab8a">00122</a> <a class="code" href="classdtn_1_1IPDiscovery.html#4ba6e7fe4ee9f19945b4c1aaf7d7ab8a" title="virtual from oasys::Thread">IPDiscovery::run</a>()
<a name="l00123"></a>00123 {
<a name="l00124"></a>00124 log_debug(<span class="stringliteral">"discovery thread running"</span>);
<a name="l00125"></a>00125 oasys::ScratchBuffer<u_char*> <a class="code" href="num2sdnv_8c.html#a81cdcc7ff6987bc85c073253e32715f">buf</a>(1024);
<a name="l00126"></a>00126 u_char* bp = buf.buf(1024);
<a name="l00127"></a>00127
<a name="l00128"></a>00128 <span class="comment">// if link state causes bind to fail, then this seems reasonable</span>
<a name="l00129"></a>00129 <span class="comment">// otherwise this may be a problem (see bind(2) for list of errors)</span>
<a name="l00130"></a>00130 <span class="keywordtype">bool</span> ok = (<a class="code" href="classdtn_1_1IPDiscovery.html#d2d28582fc8830ca107cc07aa9b79a5e" title="the socket for beacons in- and out-bound">socket_</a>.bind(<a class="code" href="classdtn_1_1IPDiscovery.html#45216229a536034944802a1bf0e3f866" title="address for bind() to receive beacons">local_addr_</a>,<a class="code" href="classdtn_1_1IPDiscovery.html#54a253ff502020915fa2521ca9a83e3e" title="local and remote">port_</a>) == 0);
<a name="l00131"></a>00131 <span class="keywordflow">if</span> (<a class="code" href="classdtn_1_1IPDiscovery.html#18f8ef2702f024cdc5a87cbc2e676b74" title="whether to exit thread on send/recv failures">persist_</a>)
<a name="l00132"></a>00132 {
<a name="l00133"></a>00133 oasys::Notifier* intr = <a class="code" href="classdtn_1_1IPDiscovery.html#d2d28582fc8830ca107cc07aa9b79a5e" title="the socket for beacons in- and out-bound">socket_</a>.get_notifier();
<a name="l00134"></a>00134 <span class="keywordflow">while</span> (! ok)
<a name="l00135"></a>00135 {
<a name="l00136"></a>00136 <span class="comment">// continue on error ... sleep a bit and try again</span>
<a name="l00137"></a>00137 intr->wait(NULL,10000); <span class="comment">// 10 seconds</span>
<a name="l00138"></a>00138
<a name="l00139"></a>00139 <span class="keywordflow">if</span> (<a class="code" href="classdtn_1_1IPDiscovery.html#004f9f774345cd25eb73ea4558b86bd7" title="signal to close down thread">shutdown_</a>) <span class="keywordflow">return</span>;
<a name="l00140"></a>00140
<a name="l00141"></a>00141 ok = (<a class="code" href="classdtn_1_1IPDiscovery.html#d2d28582fc8830ca107cc07aa9b79a5e" title="the socket for beacons in- and out-bound">socket_</a>.bind(<a class="code" href="classdtn_1_1IPDiscovery.html#45216229a536034944802a1bf0e3f866" title="address for bind() to receive beacons">local_addr_</a>,<a class="code" href="classdtn_1_1IPDiscovery.html#54a253ff502020915fa2521ca9a83e3e" title="local and remote">port_</a>) == 0);
<a name="l00142"></a>00142 }
<a name="l00143"></a>00143 }
<a name="l00144"></a>00144 <span class="keywordflow">else</span>
<a name="l00145"></a>00145 <span class="keywordflow">if</span> (! ok)
<a name="l00146"></a>00146 {
<a name="l00147"></a>00147 log_err(<span class="stringliteral">"bind failed"</span>);
<a name="l00148"></a>00148 <span class="keywordflow">return</span>;
<a name="l00149"></a>00149 }
<a name="l00150"></a>00150
<a name="l00151"></a>00151 <span class="keywordtype">size_t</span> <a class="code" href="num2sdnv_8c.html#fed088663f8704004425cdae2120b9b3">len</a> = 0;
<a name="l00152"></a>00152 <span class="keywordtype">int</span> cc = 0;
<a name="l00153"></a>00153
<a name="l00154"></a>00154 <span class="keywordflow">while</span> (<span class="keyword">true</span>)
<a name="l00155"></a>00155 {
<a name="l00156"></a>00156 <span class="keywordflow">if</span> (<a class="code" href="classdtn_1_1IPDiscovery.html#004f9f774345cd25eb73ea4558b86bd7" title="signal to close down thread">shutdown_</a>) <span class="keywordflow">break</span>;
<a name="l00157"></a>00157
<a name="l00158"></a>00158 <span class="comment">// only send out beacon(s) once per interval</span>
<a name="l00159"></a>00159 u_int min_diff = INT_MAX;
<a name="l00160"></a>00160 <span class="keywordflow">for</span> (<a class="code" href="classdtn_1_1Discovery.html#e046ec0e0ebde9cf34e14d94e56ea3bf">iterator</a> iter = <a class="code" href="classdtn_1_1Discovery.html#7fb0c15e93e20fccdf1bb439aefa34e3" title="registered Announce objects">list_</a>.begin(); iter != <a class="code" href="classdtn_1_1Discovery.html#7fb0c15e93e20fccdf1bb439aefa34e3" title="registered Announce objects">list_</a>.end(); iter++)
<a name="l00161"></a>00161 {
<a name="l00162"></a>00162 <a class="code" href="classdtn_1_1IPAnnounce.html" title="Helper class that 1) formats outbound beacons to advertise this CL instance via neighbor...">IPAnnounce</a>* <a class="code" href="classdtn_1_1Discovery.html#17302a43a3e0ee32249b9fbc9b58e1f8" title="Register an Announce to advertise a local convergence layer and to respond to advertisements...">announce</a> = <span class="keyword">dynamic_cast<</span><a class="code" href="classdtn_1_1IPAnnounce.html" title="Helper class that 1) formats outbound beacons to advertise this CL instance via neighbor...">IPAnnounce</a>*<span class="keyword">></span>(*iter);
<a name="l00163"></a>00163 u_int remaining = announce-><a class="code" href="classdtn_1_1Announce.html#381c7961b5b0d78fcc58d1d64a1d84ca" title="Return the number of milliseconds remaining until the interval expires, or 0 if it&#39;s...">interval_remaining</a>();
<a name="l00164"></a>00164 <span class="keywordflow">if</span> (remaining == 0)
<a name="l00165"></a>00165 {
<a name="l00166"></a>00166 oasys::UDPClient alt;
<a name="l00167"></a>00167 oasys::UDPClient* sock = NULL;
<a name="l00168"></a>00168 <span class="comment">// need to bind to CL's local addr to send out on correct interface</span>
<a name="l00169"></a>00169 <span class="comment">// if disc already is, then use its socket</span>
<a name="l00170"></a>00170 <span class="comment">// else create a new socket that bind()s to the right interface</span>
<a name="l00171"></a>00171 <span class="keywordflow">if</span> (<a class="code" href="classdtn_1_1IPDiscovery.html#d2d28582fc8830ca107cc07aa9b79a5e" title="the socket for beacons in- and out-bound">socket_</a>.local_addr() == announce-><a class="code" href="classdtn_1_1IPAnnounce.html#21bec094356706cb501349498969fde2" title="Export cl_addr to use in sending Announcement out on correct interface.">cl_addr</a>())
<a name="l00172"></a>00172 sock = &<a class="code" href="classdtn_1_1IPDiscovery.html#d2d28582fc8830ca107cc07aa9b79a5e" title="the socket for beacons in- and out-bound">socket_</a>;
<a name="l00173"></a>00173 <span class="keywordflow">else</span>
<a name="l00174"></a>00174 {
<a name="l00175"></a>00175 alt.params_ = <a class="code" href="classdtn_1_1IPDiscovery.html#d2d28582fc8830ca107cc07aa9b79a5e" title="the socket for beacons in- and out-bound">socket_</a>.params_;
<a name="l00176"></a>00176 <a class="code" href="classdtn_1_1IPDiscovery.html#d2d28582fc8830ca107cc07aa9b79a5e" title="the socket for beacons in- and out-bound">socket_</a>.set_remote_addr(<a class="code" href="classdtn_1_1IPDiscovery.html#92c069ec1b1e15bad6cf52d926442213" title="whether unicast, multicast, or broadcast">remote_addr_</a>);
<a name="l00177"></a>00177 <span class="keywordflow">if</span> (alt.bind(announce-><a class="code" href="classdtn_1_1IPAnnounce.html#21bec094356706cb501349498969fde2" title="Export cl_addr to use in sending Announcement out on correct interface.">cl_addr</a>(),<a class="code" href="classdtn_1_1IPDiscovery.html#54a253ff502020915fa2521ca9a83e3e" title="local and remote">port_</a>) != 0)
<a name="l00178"></a>00178 {
<a name="l00179"></a>00179 log_err(<span class="stringliteral">"failed to bind to %s:%u -- %s (%d)"</span>,
<a name="l00180"></a>00180 intoa(announce-><a class="code" href="classdtn_1_1IPAnnounce.html#21bec094356706cb501349498969fde2" title="Export cl_addr to use in sending Announcement out on correct interface.">cl_addr</a>()),<a class="code" href="classdtn_1_1IPDiscovery.html#54a253ff502020915fa2521ca9a83e3e" title="local and remote">port_</a>,
<a name="l00181"></a>00181 strerror(<a class="code" href="IPDiscovery_8cc.html#d65a8842cc674e3ddf69355898c0ecbf">errno</a>),<a class="code" href="IPDiscovery_8cc.html#d65a8842cc674e3ddf69355898c0ecbf">errno</a>);
<a name="l00182"></a>00182 <span class="keywordflow">continue</span>;
<a name="l00183"></a>00183 }
<a name="l00184"></a>00184 sock = &alt;
<a name="l00185"></a>00185 }
<a name="l00186"></a>00186 log_debug(<span class="stringliteral">"announce ready for sending"</span>);
<a name="l00187"></a>00187 len = announce-><a class="code" href="classdtn_1_1IPAnnounce.html#479164ae808ee96bfd3c288c9182d4df" title="Serialize announcement out to buffer.">format_advertisement</a>(bp,1024);
<a name="l00188"></a>00188 cc = sock->sendto((<span class="keywordtype">char</span>*)bp,len,0,<a class="code" href="classdtn_1_1IPDiscovery.html#92c069ec1b1e15bad6cf52d926442213" title="whether unicast, multicast, or broadcast">remote_addr_</a>,<a class="code" href="classdtn_1_1IPDiscovery.html#54a253ff502020915fa2521ca9a83e3e" title="local and remote">port_</a>);
<a name="l00189"></a>00189 <span class="keywordflow">if</span> (cc != (<span class="keywordtype">int</span>) len)
<a name="l00190"></a>00190 {
<a name="l00191"></a>00191 log_err(<span class="stringliteral">"sendto failed: %s (%d)"</span>,
<a name="l00192"></a>00192 strerror(<a class="code" href="IPDiscovery_8cc.html#d65a8842cc674e3ddf69355898c0ecbf">errno</a>),<a class="code" href="IPDiscovery_8cc.html#d65a8842cc674e3ddf69355898c0ecbf">errno</a>);
<a name="l00193"></a>00193
<a name="l00194"></a>00194 <span class="comment">// quit thread on error</span>
<a name="l00195"></a>00195 <span class="keywordflow">if</span> (!<a class="code" href="classdtn_1_1IPDiscovery.html#18f8ef2702f024cdc5a87cbc2e676b74" title="whether to exit thread on send/recv failures">persist_</a>) <span class="keywordflow">return</span>;
<a name="l00196"></a>00196 }
<a name="l00197"></a>00197 min_diff = announce-><a class="code" href="classdtn_1_1Announce.html#ea3deb5caedf6d291d0f60630d9be883" title="Number of milliseconds between announcements.">interval</a>();
<a name="l00198"></a>00198 alt.close();
<a name="l00199"></a>00199 }
<a name="l00200"></a>00200 <span class="keywordflow">else</span>
<a name="l00201"></a>00201 {
<a name="l00202"></a>00202 log_debug(<span class="stringliteral">"announce not ready: %u ms remaining"</span>, remaining);
<a name="l00203"></a>00203 <span class="keywordflow">if</span> (remaining < min_diff) {
<a name="l00204"></a>00204 min_diff = announce-><a class="code" href="classdtn_1_1Announce.html#381c7961b5b0d78fcc58d1d64a1d84ca" title="Return the number of milliseconds remaining until the interval expires, or 0 if it&#39;s...">interval_remaining</a>();
<a name="l00205"></a>00205 }
<a name="l00206"></a>00206 }
<a name="l00207"></a>00207 }
<a name="l00208"></a>00208
<a name="l00209"></a>00209 <span class="comment">// figure out whatever time is left (if poll has already fired within</span>
<a name="l00210"></a>00210 <span class="comment">// interval ms) and set up poll timeout</span>
<a name="l00211"></a>00211 u_int timeout = min_diff;
<a name="l00212"></a>00212
<a name="l00213"></a>00213 log_debug(<span class="stringliteral">"polling on socket: timeout %u"</span>, timeout);
<a name="l00214"></a>00214 cc = <a class="code" href="classdtn_1_1IPDiscovery.html#d2d28582fc8830ca107cc07aa9b79a5e" title="the socket for beacons in- and out-bound">socket_</a>.poll_sockfd(POLLIN,NULL,timeout);
<a name="l00215"></a>00215
<a name="l00216"></a>00216 <span class="keywordflow">if</span> (<a class="code" href="classdtn_1_1IPDiscovery.html#004f9f774345cd25eb73ea4558b86bd7" title="signal to close down thread">shutdown_</a>) {
<a name="l00217"></a>00217 log_debug(<span class="stringliteral">"shutdown bit set, exiting thread"</span>);
<a name="l00218"></a>00218 <span class="keywordflow">break</span>;
<a name="l00219"></a>00219 }
<a name="l00220"></a>00220
<a name="l00221"></a>00221 <span class="comment">// if timeout, then flip back around and send beacons</span>
<a name="l00222"></a>00222 <span class="keywordflow">if</span> (cc == oasys::IOTIMEOUT || cc == oasys::IOINTR)
<a name="l00223"></a>00223 {
<a name="l00224"></a>00224 <span class="keywordflow">continue</span>;
<a name="l00225"></a>00225 }
<a name="l00226"></a>00226 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (cc < 0)
<a name="l00227"></a>00227 {
<a name="l00228"></a>00228 log_err(<span class="stringliteral">"poll error (%d): %s (%d)"</span>,
<a name="l00229"></a>00229 cc, strerror(<a class="code" href="IPDiscovery_8cc.html#d65a8842cc674e3ddf69355898c0ecbf">errno</a>), <a class="code" href="IPDiscovery_8cc.html#d65a8842cc674e3ddf69355898c0ecbf">errno</a>);
<a name="l00230"></a>00230 <span class="keywordflow">return</span>;
<a name="l00231"></a>00231 }
<a name="l00232"></a>00232 <span class="keywordflow">else</span> <span class="keywordflow">if</span> (cc == 1)
<a name="l00233"></a>00233 {
<a name="l00234"></a>00234 in_addr_t remote_addr;
<a name="l00235"></a>00235 u_int16_t remote_port;
<a name="l00236"></a>00236
<a name="l00237"></a>00237 cc = <a class="code" href="classdtn_1_1IPDiscovery.html#d2d28582fc8830ca107cc07aa9b79a5e" title="the socket for beacons in- and out-bound">socket_</a>.recvfrom((<span class="keywordtype">char</span>*)bp,1024,0,&remote_addr,&remote_port);
<a name="l00238"></a>00238 <span class="keywordflow">if</span> (cc < 0)
<a name="l00239"></a>00239 {
<a name="l00240"></a>00240 log_err(<span class="stringliteral">"error on recvfrom (%d): %s (%d)"</span>,cc,
<a name="l00241"></a>00241 strerror(<a class="code" href="IPDiscovery_8cc.html#d65a8842cc674e3ddf69355898c0ecbf">errno</a>),<a class="code" href="IPDiscovery_8cc.html#d65a8842cc674e3ddf69355898c0ecbf">errno</a>);
<a name="l00242"></a>00242 <span class="keywordflow">if</span> (!<a class="code" href="classdtn_1_1IPDiscovery.html#18f8ef2702f024cdc5a87cbc2e676b74" title="whether to exit thread on send/recv failures">persist_</a>) <span class="keywordflow">return</span>;
<a name="l00243"></a>00243 <span class="keywordflow">else</span> <span class="keywordflow">continue</span>;
<a name="l00244"></a>00244 }
<a name="l00245"></a>00245
<a name="l00246"></a>00246 <a class="code" href="classdtn_1_1EndpointID.html">EndpointID</a> remote_eid;
<a name="l00247"></a>00247 u_int8_t cl_type;
<a name="l00248"></a>00248 std::string nexthop;
<a name="l00249"></a>00249 <span class="keywordflow">if</span> (!<a class="code" href="classdtn_1_1IPDiscovery.html#ac535bfa53ab2daf771e65c48db9781c" title="Convenience method to pull the relevant items out of the inbound packet.">parse_advertisement</a>(bp,cc,remote_addr,cl_type,nexthop,
<a name="l00250"></a>00250 remote_eid))
<a name="l00251"></a>00251 {
<a name="l00252"></a>00252 log_warn(<span class="stringliteral">"unable to parse beacon from %s:%d"</span>,
<a name="l00253"></a>00253 intoa(remote_addr),remote_port);
<a name="l00254"></a>00254 <span class="keywordflow">if</span> (!<a class="code" href="classdtn_1_1IPDiscovery.html#18f8ef2702f024cdc5a87cbc2e676b74" title="whether to exit thread on send/recv failures">persist_</a>) <span class="keywordflow">return</span>;
<a name="l00255"></a>00255 <span class="keywordflow">else</span> <span class="keywordflow">continue</span>;
<a name="l00256"></a>00256 }
<a name="l00257"></a>00257
<a name="l00258"></a>00258 <span class="keywordflow">if</span> (remote_eid.<a class="code" href="classdtn_1_1EndpointID.html#80721c0832c08c5066e6d6276d62d70b" title="Simple equality test function.">equals</a>(BundleDaemon::instance()->local_eid()))
<a name="l00259"></a>00259 {
<a name="l00260"></a>00260 log_debug(<span class="stringliteral">"ignoring beacon from self (%s:%d)"</span>,
<a name="l00261"></a>00261 intoa(remote_addr),remote_port);
<a name="l00262"></a>00262 <span class="keywordflow">continue</span>;
<a name="l00263"></a>00263 }
<a name="l00264"></a>00264
<a name="l00265"></a>00265 <span class="comment">// distribute to all beacons registered for this CL type</span>
<a name="l00266"></a>00266 <a class="code" href="classdtn_1_1Discovery.html#6b6da97e92e834b9997b9fc2812fe74b" title="Handle neighbor discovery out to registered DiscoveryInfo objects.">handle_neighbor_discovered</a>(
<a name="l00267"></a>00267 <a class="code" href="classdtn_1_1IPDiscovery.html#b8d11e70af91ec4342bb5be2016de212">IPDiscovery::type_to_str</a>((<a class="code" href="classdtn_1_1IPDiscovery.html#dba811f3518ddee9d6e16317af505e4d" title="Enumerate which type of CL is advertised.">IPDiscovery::cl_type_t</a>)cl_type),
<a name="l00268"></a>00268 nexthop, remote_eid);
<a name="l00269"></a>00269 }
<a name="l00270"></a>00270 <span class="keywordflow">else</span>
<a name="l00271"></a>00271 {
<a name="l00272"></a>00272 PANIC(<span class="stringliteral">"unexpected result from poll (%d)"</span>,cc);
<a name="l00273"></a>00273 }
<a name="l00274"></a>00274 }
<a name="l00275"></a>00275 }
<a name="l00276"></a>00276
<a name="l00277"></a>00277 <span class="keywordtype">bool</span>
<a name="l00278"></a><a class="code" href="classdtn_1_1IPDiscovery.html#ac535bfa53ab2daf771e65c48db9781c">00278</a> <a class="code" href="classdtn_1_1IPDiscovery.html#ac535bfa53ab2daf771e65c48db9781c" title="Convenience method to pull the relevant items out of the inbound packet.">IPDiscovery::parse_advertisement</a>(u_char* bp, <span class="keywordtype">size_t</span> <a class="code" href="num2sdnv_8c.html#fed088663f8704004425cdae2120b9b3">len</a>,
<a name="l00279"></a>00279 in_addr_t remote_addr, u_int8_t& cl_type,
<a name="l00280"></a>00280 std::string& nexthop, <a class="code" href="classdtn_1_1EndpointID.html">EndpointID</a>& remote_eid)
<a name="l00281"></a>00281 {
<a name="l00282"></a>00282 <span class="keywordflow">if</span> (len <= <span class="keyword">sizeof</span>(<a class="code" href="structdtn_1_1IPDiscovery_1_1DiscoveryHeader.html" title="On-the-wire (radio, whatever) representation of IP address family&#39;s advertisement...">DiscoveryHeader</a>))
<a name="l00283"></a>00283 <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00284"></a>00284
<a name="l00285"></a>00285 <a class="code" href="structdtn_1_1IPDiscovery_1_1DiscoveryHeader.html" title="On-the-wire (radio, whatever) representation of IP address family&#39;s advertisement...">DiscoveryHeader</a>* hdr = (<a class="code" href="structdtn_1_1IPDiscovery_1_1DiscoveryHeader.html" title="On-the-wire (radio, whatever) representation of IP address family&#39;s advertisement...">DiscoveryHeader</a>*) bp;
<a name="l00286"></a>00286 <span class="keywordtype">size_t</span> length = ntohs(hdr-><a class="code" href="structdtn_1_1IPDiscovery_1_1DiscoveryHeader.html#0f116d9dcd8bda3dc04ef39289472616">length</a>);
<a name="l00287"></a>00287 <span class="keywordflow">if</span> (len < length)
<a name="l00288"></a>00288 <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00289"></a>00289
<a name="l00290"></a>00290 in_addr_t cl_addr;
<a name="l00291"></a>00291 u_int16_t cl_port;
<a name="l00292"></a>00292
<a name="l00293"></a>00293 cl_type = hdr-><a class="code" href="structdtn_1_1IPDiscovery_1_1DiscoveryHeader.html#32a40fc26bb8c14a9dc8ebee32150e12">cl_type</a>;
<a name="l00294"></a>00294 cl_addr = (hdr-><a class="code" href="structdtn_1_1IPDiscovery_1_1DiscoveryHeader.html#c5a98cccac5ccd9d4643cc1cd93d67f5">inet_addr</a> == INADDR_ANY) ? remote_addr : hdr-><a class="code" href="structdtn_1_1IPDiscovery_1_1DiscoveryHeader.html#c5a98cccac5ccd9d4643cc1cd93d67f5">inet_addr</a>;
<a name="l00295"></a>00295 cl_port = ntohs(hdr-><a class="code" href="structdtn_1_1IPDiscovery_1_1DiscoveryHeader.html#54865d9ae240388f13b78dc74f8ae26f">inet_port</a>);
<a name="l00296"></a>00296
<a name="l00297"></a>00297 oasys::StringBuffer <a class="code" href="num2sdnv_8c.html#a81cdcc7ff6987bc85c073253e32715f">buf</a>(<span class="stringliteral">"%s:%d"</span>,intoa(cl_addr),cl_port);
<a name="l00298"></a>00298 nexthop.assign(buf.c_str());
<a name="l00299"></a>00299
<a name="l00300"></a>00300 <span class="keywordtype">size_t</span> name_len = ntohs(hdr-><a class="code" href="structdtn_1_1IPDiscovery_1_1DiscoveryHeader.html#f0b39f36e48f357726218ac7d88e3343">name_len</a>);
<a name="l00301"></a>00301 std::string eidstr(hdr-><a class="code" href="structdtn_1_1IPDiscovery_1_1DiscoveryHeader.html#37420e481d125d89aaef220b3b906e3d">sender_name</a>,name_len);
<a name="l00302"></a>00302
<a name="l00303"></a>00303 <span class="keywordflow">return</span> remote_eid.<a class="code" href="classdtn_1_1EndpointID.html#ec39752e4da3107b16ff5da58d2aa5ab" title="Assign this endpoint ID as a copy of the other.">assign</a>(eidstr);
<a name="l00304"></a>00304 }
<a name="l00305"></a>00305
<a name="l00306"></a>00306 } <span class="comment">// namespace dtn</span>
</pre></div></div>
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