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13 | This module tries to speed up Net::SNMP response packet decoding. |
13 | This module tries to speed up Net::SNMP response packet decoding. |
14 | |
14 | |
15 | It does this by overriding a few selected internal method by (almost) |
15 | It does this by overriding a few selected internal method by (almost) |
16 | equivalent XS methods. |
16 | equivalent XS methods. |
17 | |
17 | |
18 | This currently reduces decode time by some 70%. |
18 | This currently reduces decode time by a factor of ten for typical bulk |
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19 | responses. |
19 | |
20 | |
20 | There are currently the following limitations when using this module: |
21 | There are currently the following limitations when using this module: |
21 | |
22 | |
22 | =over 4 |
23 | =over 4 |
23 | |
24 | |
24 | =item leading dots are required for iods |
25 | =item overriding internal functions might cause the module to |
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26 | malfunction with future versions of Net::SNMP |
25 | |
27 | |
26 | =item error handling is currently broken (but parse errors will be detected) |
28 | =item error messages will be simpler/different |
27 | |
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28 | =item oid components are limited to unsigned 32 bit integers |
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29 | |
29 | |
30 | =item translation will be ignored (all values will be delivered "raw") |
30 | =item translation will be ignored (all values will be delivered "raw") |
31 | |
31 | |
32 | =item a 64 bit perl is required |
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33 | |
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34 | =item a moderately modern (>= C99) C compiler is required |
32 | =item a moderately modern (>= C99) C compiler is required |
35 | |
33 | |
36 | =item only tested with 5.10 |
34 | =item only tested with 5.10, no intentions to port to older perls |
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35 | |
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36 | =item duplicate OIDs are not supported |
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37 | |
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38 | =item REPORT PDUs are not supported |
37 | |
39 | |
38 | =back |
40 | =back |
39 | |
41 | |
40 | =cut |
42 | =cut |
41 | |
43 | |
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44 | use strict qw(vars subs); |
46 | use strict qw(vars subs); |
45 | no warnings; |
47 | no warnings; |
46 | |
48 | |
47 | use Guard; |
49 | use Guard; |
48 | |
50 | |
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51 | use Net::SNMP (); |
49 | use Net::SNMP::PDU (); |
52 | use Net::SNMP::PDU (); |
50 | use Net::SNMP::Message (); |
53 | use Net::SNMP::Message (); |
51 | use Net::SNMP::MessageProcessing (); |
54 | use Net::SNMP::MessageProcessing (); |
52 | |
55 | |
53 | our $VERSION; |
56 | our $VERSION; |
54 | our $old_prepare; |
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55 | |
57 | |
56 | BEGIN { |
58 | BEGIN { |
57 | $VERSION = '0.01'; |
59 | $VERSION = 1.31; |
58 | |
60 | |
59 | $old_prepare = \&Net::SNMP::MessageProcessing::prepare_data_elements; |
61 | # this overrides many methods inside Net::SNMP and it's submodules |
60 | |
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61 | # this overrides many methods inside |
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62 | require XSLoader; |
62 | require XSLoader; |
63 | XSLoader::load Net::SNMP::XS, $VERSION; |
63 | XSLoader::load Net::SNMP::XS, $VERSION; |
64 | } |
64 | } |
65 | |
65 | |
66 | sub Net::SNMP::MessageProcessing::prepare_data_elements { |
66 | package Net::SNMP::Message; |
67 | my ($self, $msg) = @_; |
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68 | |
67 | |
69 | set_msg $msg, $msg->{_buffer}; |
68 | Net::SNMP::XS::set_type INTEGER , \&_process_integer32; |
70 | scope_guard \&clr_msg; |
69 | Net::SNMP::XS::set_type OCTET_STRING , \&_process_octet_string; |
71 | &$old_prepare |
70 | Net::SNMP::XS::set_type NULL , \&_process_null; |
72 | } |
71 | Net::SNMP::XS::set_type OBJECT_IDENTIFIER, \&_process_object_identifier; |
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72 | Net::SNMP::XS::set_type SEQUENCE , \&_process_sequence; |
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73 | Net::SNMP::XS::set_type IPADDRESS , \&_process_ipaddress; |
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74 | Net::SNMP::XS::set_type COUNTER , \&_process_counter; |
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75 | Net::SNMP::XS::set_type GAUGE , \&_process_gauge; |
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76 | Net::SNMP::XS::set_type TIMETICKS , \&_process_timeticks; |
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77 | Net::SNMP::XS::set_type OPAQUE , \&_process_opaque; |
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78 | Net::SNMP::XS::set_type COUNTER64 , \&_process_counter64; |
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79 | Net::SNMP::XS::set_type NOSUCHOBJECT , \&_process_nosuchobject; |
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80 | Net::SNMP::XS::set_type NOSUCHINSTANCE , \&_process_nosuchinstance; |
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81 | Net::SNMP::XS::set_type ENDOFMIBVIEW , \&_process_endofmibview; |
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82 | Net::SNMP::XS::set_type GET_REQUEST , \&_process_get_request; |
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83 | Net::SNMP::XS::set_type GET_NEXT_REQUEST , \&_process_get_next_request; |
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84 | Net::SNMP::XS::set_type GET_RESPONSE , \&_process_get_response; |
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85 | Net::SNMP::XS::set_type SET_REQUEST , \&_process_set_request; |
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86 | Net::SNMP::XS::set_type TRAP , \&_process_trap; |
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87 | Net::SNMP::XS::set_type GET_BULK_REQUEST , \&_process_get_bulk_request; |
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88 | Net::SNMP::XS::set_type INFORM_REQUEST , \&_process_inform_request; |
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89 | Net::SNMP::XS::set_type SNMPV2_TRAP , \&_process_v2_trap; |
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90 | Net::SNMP::XS::set_type REPORT , \&_process_report; |
73 | |
91 | |
74 | # almost direct copy from Net::SNMP::Message, as we cannot access $process_methods |
92 | package Net::SNMP::PDU; |
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93 | |
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94 | # var_bind_list hardcodes oid_lex_sort. *sigh* |
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95 | # we copy it 1:1, except for using oid_lex_sort. |
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96 | |
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97 | sub var_bind_list |
75 | { |
98 | { |
76 | package Net::SNMP::Message; |
99 | my ($this, $vbl, $types) = @_; |
77 | |
100 | |
78 | my @process_methods; |
101 | return if defined($this->{_error}); |
79 | |
102 | |
80 | $process_methods [INTEGER ] = \&_process_integer32; |
103 | if (@_ > 1) { |
81 | $process_methods [OCTET_STRING ] = \&_process_octet_string; |
104 | # The VarBindList HASH is being updated from an external |
82 | $process_methods [NULL ] = \&_process_null; |
105 | # source. We need to update the VarBind names ARRAY to |
83 | $process_methods [OBJECT_IDENTIFIER] = \&_process_object_identifier; |
106 | # correspond to the new keys of the HASH. If the updated |
84 | $process_methods [SEQUENCE ] = \&_process_sequence; |
107 | # information is valid, we will use lexicographical ordering |
85 | $process_methods [IPADDRESS ] = \&_process_ipaddress; |
108 | # for the ARRAY entries since we do not have a PDU to use |
86 | $process_methods [COUNTER ] = \&_process_counter; |
109 | # to determine the ordering. The ASN.1 types HASH is also |
87 | $process_methods [GAUGE ] = \&_process_gauge; |
110 | # updated here if a cooresponding HASH is passed. We double |
88 | $process_methods [TIMETICKS ] = \&_process_timeticks; |
111 | # check the mapping by populating the hash with the keys of |
89 | $process_methods [OPAQUE ] = \&_process_opaque; |
112 | # the VarBindList HASH. |
90 | $process_methods [COUNTER64 ] = \&_process_counter64; |
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91 | $process_methods [NOSUCHOBJECT ] = \&_process_nosuchobject; |
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92 | $process_methods [NOSUCHINSTANCE ] = \&_process_nosuchinstance; |
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93 | $process_methods [ENDOFMIBVIEW ] = \&_process_endofmibview; |
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94 | $process_methods [GET_REQUEST ] = \&_process_get_request; |
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95 | $process_methods [GET_NEXT_REQUEST ] = \&_process_get_next_request; |
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96 | $process_methods [GET_RESPONSE ] = \&_process_get_response; |
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97 | $process_methods [SET_REQUEST ] = \&_process_set_request; |
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98 | $process_methods [TRAP ] = \&_process_trap; |
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99 | $process_methods [GET_BULK_REQUEST ] = \&_process_get_bulk_request; |
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100 | $process_methods [INFORM_REQUEST ] = \&_process_inform_request; |
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101 | $process_methods [SNMPV2_TRAP ] = \&_process_v2_trap; |
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102 | $process_methods [REPORT ] = \&_process_report; |
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103 | |
113 | |
104 | # should be done in XS |
114 | if (!defined($vbl) || (ref($vbl) ne 'HASH')) { |
105 | sub process |
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106 | { |
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107 | # my ($this, $expected, $found) = @_; |
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108 | |
115 | |
109 | return $_[0]->_error if defined($_[0]->{_error}); |
116 | $this->{_var_bind_list} = undef; |
110 | return $_[0]->_error unless defined(my $type = _buffer_get($_[0], 1)); |
117 | $this->{_var_bind_names} = []; |
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118 | $this->{_var_bind_types} = undef; |
111 | |
119 | |
112 | $type = unpack 'C', $type; |
120 | } else { |
113 | |
121 | |
114 | if ($process_methods[$type]) { |
122 | $this->{_var_bind_list} = $vbl; |
115 | if (@_ >= 2 && (defined $_[1]) && $type != $_[1]) { |
123 | |
116 | return $_[0]->_error( |
124 | @{$this->{_var_bind_names}} = Net::SNMP::oid_lex_sort keys %$vbl; |
117 | 'Expected %s, but found %s', asn1_itoa($_[1]), asn1_itoa($type) |
125 | |
118 | ); |
126 | if (!defined($types) || (ref($types) ne 'HASH')) { |
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127 | $types = {}; |
119 | } |
128 | } |
120 | $_[2] = $type if (@_ == 3); |
129 | |
121 | $process_methods[$type]->($_[0], $type); |
130 | map { |
122 | } else { |
131 | $this->{_var_bind_types}->{$_} = |
123 | $_[0]->_error('Unknown ASN.1 type [0x%02x]', $type); |
132 | exists($types->{$_}) ? $types->{$_} : undef; |
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133 | } keys(%{$vbl}); |
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134 | |
124 | } |
135 | } |
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136 | |
125 | } |
137 | } |
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138 | |
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139 | $this->{_var_bind_list}; |
126 | } |
140 | } |
127 | |
141 | |
128 | 1; |
142 | 1; |
129 | |
143 | |
130 | =head1 AUTHOR |
144 | =head1 AUTHOR |