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=head1 NAME |
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Net::SNMP::XS - speed up Net::SNMP by decoding in XS, with limitations |
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=head1 SYNOPSIS |
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use Net::SNMP::XS; |
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# loading it is enough, there are no public symbols |
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=head1 DESCRIPTION |
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This module tries to speed up Net::SNMP response packet decoding. |
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It does this by overriding a few selected internal method by (almost) |
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equivalent XS methods. |
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This currently reduces decode time by a factor of ten for typical bulk |
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responses. |
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There are currently the following limitations when using this module: |
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=over 4 |
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|
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=item overriding internal functions might cause the module to |
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malfunction with future versions of Net::SNMP |
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=item error messages will be simpler/different |
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=item translation will be ignored (all values will be delivered "raw") |
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=item a moderately modern (>= C99) C compiler is required |
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=item only tested with 5.10, no intentions to port to older perls |
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=item duplicate OIDs are not supported |
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=item REPORT PDUs are not supported |
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=back |
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=cut |
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package Net::SNMP::XS; |
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use common::sense; |
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use Net::SNMP (); |
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use Net::SNMP::PDU (); |
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use Net::SNMP::Message (); |
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use Net::SNMP::MessageProcessing (); |
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our $VERSION; |
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BEGIN { |
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$VERSION = 1.32; |
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# this overrides many methods inside Net::SNMP and it's submodules |
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require XSLoader; |
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XSLoader::load Net::SNMP::XS, $VERSION; |
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} |
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package Net::SNMP::Message; |
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Net::SNMP::XS::set_type INTEGER , \&_process_integer32; |
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Net::SNMP::XS::set_type OCTET_STRING , \&_process_octet_string; |
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Net::SNMP::XS::set_type NULL , \&_process_null; |
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Net::SNMP::XS::set_type OBJECT_IDENTIFIER, \&_process_object_identifier; |
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Net::SNMP::XS::set_type SEQUENCE , \&_process_sequence; |
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Net::SNMP::XS::set_type IPADDRESS , \&_process_ipaddress; |
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Net::SNMP::XS::set_type COUNTER , \&_process_counter; |
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Net::SNMP::XS::set_type GAUGE , \&_process_gauge; |
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Net::SNMP::XS::set_type TIMETICKS , \&_process_timeticks; |
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Net::SNMP::XS::set_type OPAQUE , \&_process_opaque; |
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Net::SNMP::XS::set_type COUNTER64 , \&_process_counter64; |
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Net::SNMP::XS::set_type NOSUCHOBJECT , \&_process_nosuchobject; |
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Net::SNMP::XS::set_type NOSUCHINSTANCE , \&_process_nosuchinstance; |
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Net::SNMP::XS::set_type ENDOFMIBVIEW , \&_process_endofmibview; |
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Net::SNMP::XS::set_type GET_REQUEST , \&_process_get_request; |
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Net::SNMP::XS::set_type GET_NEXT_REQUEST , \&_process_get_next_request; |
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Net::SNMP::XS::set_type GET_RESPONSE , \&_process_get_response; |
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Net::SNMP::XS::set_type SET_REQUEST , \&_process_set_request; |
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Net::SNMP::XS::set_type TRAP , \&_process_trap; |
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Net::SNMP::XS::set_type GET_BULK_REQUEST , \&_process_get_bulk_request; |
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Net::SNMP::XS::set_type INFORM_REQUEST , \&_process_inform_request; |
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Net::SNMP::XS::set_type SNMPV2_TRAP , \&_process_v2_trap; |
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Net::SNMP::XS::set_type REPORT , \&_process_report; |
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package Net::SNMP::PDU; |
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# var_bind_list hardcodes oid_lex_sort. *sigh* |
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# we copy it 1:1, except for using oid_lex_sort. |
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sub var_bind_list |
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{ |
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my ($this, $vbl, $types) = @_; |
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return if defined($this->{_error}); |
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if (@_ > 1) { |
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# The VarBindList HASH is being updated from an external |
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# source. We need to update the VarBind names ARRAY to |
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# correspond to the new keys of the HASH. If the updated |
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# information is valid, we will use lexicographical ordering |
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# for the ARRAY entries since we do not have a PDU to use |
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# to determine the ordering. The ASN.1 types HASH is also |
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# updated here if a cooresponding HASH is passed. We double |
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# check the mapping by populating the hash with the keys of |
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# the VarBindList HASH. |
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if (!defined($vbl) || (ref($vbl) ne 'HASH')) { |
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$this->{_var_bind_list} = undef; |
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$this->{_var_bind_names} = []; |
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$this->{_var_bind_types} = undef; |
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} else { |
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$this->{_var_bind_list} = $vbl; |
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@{$this->{_var_bind_names}} = Net::SNMP::oid_lex_sort keys %$vbl; |
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if (!defined($types) || (ref($types) ne 'HASH')) { |
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$types = {}; |
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} |
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map { |
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$this->{_var_bind_types}->{$_} = |
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exists($types->{$_}) ? $types->{$_} : undef; |
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} keys(%{$vbl}); |
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} |
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} |
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$this->{_var_bind_list}; |
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} |
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1; |
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=head1 AUTHOR |
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Marc Lehmann <schmorp@schmorp.de> |
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http://home.schmorp.de/ |
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=cut |
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