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diff --git a/ACE/ASNMP/asnmp-overview.html b/ACE/ASNMP/asnmp-overview.html new file mode 100644 index 00000000000..4e336178b0d --- /dev/null +++ b/ACE/ASNMP/asnmp-overview.html @@ -0,0 +1,134 @@ +<html> +<!-- $Id$ --> +<! by Michael R. MacFaden mrm@cisco.com > +<title>ASNMP Overview</title> + +<h1>ASNMP Overview</h1> + +<p>The Another SNMP class library is an Object Oriented programming +toolkit for using IETF standard network management protocols in the +Internet. The SNMP protocol is perhaps the most ubiquitous management +protocol running on most very device or application deployed in the +modern network today. + +<p>ASNMP is targeted to programmers that want to write command and +control (C&C) applications. C&C Applications communicate with +a variety of objects: +<sl> +<li>network devices such as ATM switches, Internet routers, +LAN bridges and LAN printers +<li>Routing protocols such as OSPF +<li>database servers such as ORACLE or Informix. + +<p>ASNMP Version 1 implements a blocking SNMP Version 1 with some +Version 2c additions (Counter32, Counter64 SMI values). See +SNMP Version 1 as defined in the IETF Request for Comments (RFC) +<sl> +<li>1155 +<li>1157 +<li>1213 +<li>1215 +<sl> +<p>Also see the RFC 1902 spec for new SMI datatypes such as Counter64. + +<p>ASNMP is built using the CMU SNMP and HP SNMP++ as the base +classes then modified for use in the ACE framework. About 10% of the API +changed during code rework. See ASNMP/asnmp/ChangeLog for details. + +<p>ASNMP can be used for either manager applications or agent applications. +The <i>Snmp</i> class contains the interface for manager applications. The +<i>sagent</i> class contains the interface for agent applications. A +trivial agent that implements the mib II system group per rfc1213 is +in the agents/ directory. + +<h2>Class Heirarchy</h2> + +<pre> +UdpTarget - Defines a collection of attributes needed to define a + communications session with an SNMP agent + This includes network address, response timeout, etc. + +Snmp - A logical session between NM app and agent. Provides the + commands get, get_next, trap. Manages transactions between app and + server. + +Pdu - A container object that represents an SNMP Protocol Data Unit. + A Pdu contains a command (get,getnext,trap) Varbind List list, + a community string. + +Vb - Aka Varbind or Variable Binding. A pdu can have zero, + one or more of these. A Vb consists of an Oid to identify + the variable and a value corresponding to one of the SMI values. + The oid/value binding is defined in a MIB file (RFC 1155) + Agents hava a MIB file that defines what each variable means. + Most agents implement MIB II as defined in RFC 1156. + +<p>The Structure of Managment Information (SMI) datatypes +and related types are: +<ul> +<li>Address->IpAddress->UdpAddress as well as MAC, IPX, IPXSOCK, Netbios +<li>Unsigned Integer +<li>Gauge32 +<li>Integer32 +<li>Counter32 +<li>Counter64 +<li>TimeTicks +<li>OctetStr +<li>Oid +</ul> + +<hr> + +<h2>Sample program</h2> +<p>A sample Object to get obtain an Agent's Systems' Description +given an network address and a community string. + +class system_id { + public: + system_id(UdpAddress addr, OctetStr read_community_string) + { + UdpTarget tgt; + Snmp snmp; + Pdu pdu; + Oid oid("1.3.6.1.2.1.1.1.0"); + Vb vb(oid); + tgt.set_address(addr); + tgt.set_read_community(read_community_string); + pdu += vb; + + if (snmp.get(pdu, tgt) == 0) { + pdu.get_vb(vb, 0); + vb.get_value(desc_); + } + else + desc_ = "<error - no value set>" + } + + int get_description(OctetStr& description) { + description = desc_; + return 0; + } + +private: + OctetStr desc_; +}; + +<h1>Future Directions</h1> +<p>Here are some areas for further work +<sl> +<li>Add OO mib parser and mib code generator +<li>Collapse the CMU/HP code into one set of classes. +<li>Add full V2c support. +<li>Size/Speed improvements +</sl> + +<h1>References</h1> +<ul> +<li><a href="http://www.ece.ucdavis.edu/ucd-snmp/">UCD SNMP</a> +<li><a href="news://comp.protocols.snmp">comp.protocols.snmp</a> +<li><a href="http://snmp.cs.utwente.nl">University of Twente</a> +<li><a href="http://www.cis.ohio-state.edu/hypertext/faq/bngusenet/comp/protocols/snmp/top.html">SNMP FAQ</a> +<li><a href="http://www.adventnet.com/">Java based SNMP tools from Ardent</a> +<li><a href="http://misa.zurich.ibm.com/Webbin/">IBM SNMP/CMIP research</a> +</ul> +</html> |