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<!-- Copyright (C) 2003 Red Hat, Inc.                                -->
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<HTML
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><HEAD
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><TITLE
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>Configuring eCos</TITLE
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TITLE="eCos Reference Manual"
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TITLE="SNMP for eCos"
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REL="PREVIOUS"
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TITLE="Starting the SNMP Agent"
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TITLE="Test cases"
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><TR
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><TH
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COLSPAN="3"
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ALIGN="center"
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>eCos Reference Manual</TH
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></TR
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><TR
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><TD
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WIDTH="10%"
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ALIGN="left"
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VALIGN="bottom"
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><A
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HREF="net-snmp-starting-the-snmp-agent.html"
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ACCESSKEY="P"
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>Prev</A
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></TD
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><TD
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WIDTH="80%"
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ALIGN="center"
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VALIGN="bottom"
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>Chapter 47. SNMP for <SPAN
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CLASS="emphasis"
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><I
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CLASS="EMPHASIS"
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>eCos</I
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></SPAN
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></TD
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><TD
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WIDTH="10%"
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ALIGN="right"
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><A
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HREF="net-snmp-test-cases.html"
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>Next</A
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><DIV
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CLASS="SECT1"
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><H1
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CLASS="SECT1"
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><A
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NAME="NET-SNMP-CONFIGURING-ECOS">Configuring eCos</H1
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><P
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>To use the SNMP agent, the SNMP library and agent packages must be
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included in your configuration. To incorporate the stack into your
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configuration select the SNMP library and SNMP agent packages in the
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eCos Configuration Tool, or at the command line type:
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<TABLE
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BORDER="5"
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BGCOLOR="#E0E0F0"
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WIDTH="70%"
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><TR
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><TD
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><PRE
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CLASS="SCREEN"
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>$ <TT
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CLASS="USERINPUT"
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><B
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>ecosconfig add snmplib snmpagent</B
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></TT
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></PRE
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></TD
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></TR
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></TABLE
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></P
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><P
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>After adding the networking, common ethernet device drivers,
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snmp library and snmp agent packages, there is no configuration
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required. However there are a number of configuration options
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that can be set such as some details for the System MIB, and
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disabling SNMPv3 support (see below).</P
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><P
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>Starting the SNMP agent is not integrated into network
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tests other than <TT
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CLASS="FILENAME"
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>snmpping</TT
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> below, nor is it
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started automatically in normal eCos startup -
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it is up to the application to start the agent when it is ready,
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at least after the network interfaces are both &#8216;up&#8217;.</P
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><DIV
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CLASS="SECT2"
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><H2
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CLASS="SECT2"
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><A
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NAME="NET-SNMP-VERSION-USAGE">Version usage (v1, v2 or v3)</H2
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><P
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>The default build supports all three versions of the SNMP protocol, but without
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any dispatcher functionality (rfc 2571, section 3.1.1.2). This has the
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following implications :</P
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><P
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> 1. There is no community authentication for v1 and v2c.</P
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><P
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>2. Security provided by v3 can be bypassed by using v1/v2c protocol.</P
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><P
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>To provide the dispatcher with rfc 2571 type functionality, it is required to
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set up security models and access profiles. This can be provided in the normal
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Unix style by writing the required configurations in <TT
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CLASS="LITERAL"
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>snmpd.conf</TT
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>
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file. Application code may setup profiles in <TT
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CLASS="LITERAL"
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>snmpd.conf</TT
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> and
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optionally set the environment variable <TT
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CLASS="LITERAL"
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>SNMPCONFPATH</TT
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> to
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point to the file if it is not in the usual location. The whole concept works
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in the usual way as with the standard UCD-SNMP distribution.</P
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></DIV
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><DIV
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CLASS="SECT2"
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><H2
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CLASS="SECT2"
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><A
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NAME="TRAPS">Traps</H2
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><P
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>The support of the <TT
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CLASS="LITERAL"
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>trapsink</TT
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> command in the
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<A
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HREF="net-snmp-agent-manpages-snmpd.conf.html"
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>snmpd.conf</A
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> file is not tested
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and there may be problems for it working as expected. Moreover, in systems that do not
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have filesystem support, there is no way to configure a trap-session in the
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conventional way.</P
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><P
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>For reasons mentioned above, applications need to initialize their own trap
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sessions and pass it the details of trap-sink. The following is a small sample
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for initializing a v1 trap session :</P
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><TABLE
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BORDER="5"
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BGCOLOR="#E0E0F0"
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WIDTH="70%"
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><TR
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><TD
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><PRE
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CLASS="PROGRAMLISTING"
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>typedef struct trap {
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        unsigned char ip [4];
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        unsigned int  port;
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        unsigned char community [256];
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}
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trap            trapsink;
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unsinged char   sink [16];
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...
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...
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if (trapsink.ip != 0) {
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        sprintf (sink, "%d.%d.%d.%d",
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                 trapsink[0], trapsink[1], trapsink[2], trapsink[3]);
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        if (create_trap_session (sink,
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                trapsink.port,
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                (char *)trapsink.community,
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                SNMP_VERSION_1,
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                SNMP_MSG_TRAP) == 0) {
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                log_error ("Creation of trap session failed \n");
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        }
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}</PRE
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></TD
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></TR
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></TABLE
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></DIV
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><DIV
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CLASS="SECT2"
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><H2
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CLASS="SECT2"
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><A
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NAME="NET-SNMP-SNMPD-CONF"><TT
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CLASS="LITERAL"
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>snmpd.conf</TT
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> file</H2
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><P
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>Using snmpd.conf requires the inclusion of one of the file-system packages
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(eg. CYGPKG_RAMFS) and CYGPKG_FILEIO. With these two packages included, the
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SNMP sub-system will read the snmpd.conf file from the location specified in
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<TT
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CLASS="LITERAL"
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>SNMPCONFPATH</TT
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>, or the standard builtin locations, and use
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these profiles. Only the profiles specified in the <TT
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CLASS="LITERAL"
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>ACCESS-CONTROL</TT
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>
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section of <A
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HREF="net-snmp-agent-manpages-snmpd.conf.html"
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>snmpd.conf</A
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> file have
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been tested and shown to work. Other profiles which have been implemented in
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<TT
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CLASS="LITERAL"
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>UCD-SNMP-4.1.2</TT
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>'s <TT
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CLASS="LITERAL"
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>snmpd.conf</TT
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> may not work
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because the sole purpose of adding support for the snmpd.conf file has been to
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set up <TT
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CLASS="LITERAL"
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>ACCESS-CONTROL</TT
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> models.</P
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><P
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>At startup, the SNMP module tries to look for file <TT
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CLASS="FILENAME"
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>snmp.conf</TT
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>.
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If this file is not available, the module successively looks for files
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<TT
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CLASS="FILENAME"
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>snmpd.conf</TT
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>, <TT
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CLASS="FILENAME"
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>snmp.local.conf</TT
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> and
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<TT
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CLASS="FILENAME"
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>snmpd.local.conf</TT
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> at the locations pointed to by <TT
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CLASS="LITERAL"
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>SNMPCONFPATH</TT
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> environment variable. In case <TT
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CLASS="LITERAL"
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>SNMPCONFPATH</TT
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> is not defined, the search sequence is carried out in default directories.
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The default directories are :<TT
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CLASS="FILENAME"
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>/usr/share/snmp</TT
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>, <TT
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CLASS="FILENAME"
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>/usr/local/share/snmp</TT
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> and <TT
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CLASS="FILENAME"
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>$(HOME)/.snmp</TT
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>.
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The configurations read from these files are used to control both, SNMP
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applications and the SNMP agent; in the usual UNIX fashion.</P
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><P
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>The inclusion of snmpd.conf support is enabled by default when suitable
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filesystems and FILEIO packages are active.</P
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>Prev</A
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HREF="ecos-ref.html"
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>Home</A
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>Starting the SNMP Agent</TD
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>Up</A
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>Test cases</TD
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