… | |
… | |
8 | |
8 | |
9 | my $ber = ber_decode $buf, $Convert::BER::XS::SNMP_PROFILE |
9 | my $ber = ber_decode $buf, $Convert::BER::XS::SNMP_PROFILE |
10 | or die "unable to decode SNMP message"; |
10 | or die "unable to decode SNMP message"; |
11 | |
11 | |
12 | # The above results in a data structure consisting of |
12 | # The above results in a data structure consisting of |
13 | # (class, tag, flags, data) |
13 | # (class, tag, flags, data) |
14 | # tuples. Below is such a message, SNMPv1 trap |
14 | # tuples. Below is such a message, SNMPv1 trap |
15 | # with a Cisco mac change notification. |
15 | # with a Cisco mac change notification. |
16 | # Did you know that Cisco is in the news almost |
16 | # Did you know that Cisco is in the news almost |
17 | # every week because of some backdoor password |
17 | # every week because of some backdoor password |
18 | # or other extremely stupid security bug? |
18 | # or other extremely stupid security bug? |
… | |
… | |
505 | | | SEQUENCE |
505 | | | SEQUENCE |
506 | | | | SEQUENCE |
506 | | | | SEQUENCE |
507 | | | | | OID oid 1.3.6.1.2.1.1.3.0 |
507 | | | | | OID oid 1.3.6.1.2.1.1.3.0 |
508 | | | | | TIMETICKS int 638085796 |
508 | | | | | TIMETICKS int 638085796 |
509 | |
509 | |
|
|
510 | =back |
|
|
511 | |
510 | =cut |
512 | =cut |
511 | |
513 | |
512 | # reverse enum, very slow and ugly hack |
514 | # reverse enum, very slow and ugly hack |
513 | sub _re { |
515 | sub _re { |
514 | my ($export_tag, $value) = @_; |
516 | my ($export_tag, $value) = @_; |
… | |
… | |
551 | if ($ber->[BER_FLAGS]) { |
553 | if ($ber->[BER_FLAGS]) { |
552 | printf "$indent%-16.16s %-6.6s CONSTRUCTED\n", $tag, lc $type; |
554 | printf "$indent%-16.16s %-6.6s CONSTRUCTED\n", $tag, lc $type; |
553 | &_ber_dump ($_, $profile, "$indent| ") |
555 | &_ber_dump ($_, $profile, "$indent| ") |
554 | for @$data; |
556 | for @$data; |
555 | } else { |
557 | } else { |
556 | if ($data =~ y/\x20-\x7e//c / length $data > 0.2 or $data =~ /\x00./s) { |
558 | if ($data =~ y/\x20-\x7e//c / (length $data || 1) > 0.2 or $data =~ /\x00./s) { |
557 | # assume binary |
559 | # assume binary |
558 | $data = unpack "H*", $data; |
560 | $data = unpack "H*", $data; |
559 | substr $data, 40, 1e9, "..." if 40 < length $data; |
|
|
560 | } else { |
561 | } else { |
561 | $data =~ s/[^\x20-\x7e]/./g; |
562 | $data =~ s/[^\x20-\x7e]/./g; |
562 | $data = "\"$data\"" if $type =~ /string/i; |
563 | $data = "\"$data\"" if $type =~ /string/i || !length $data; |
563 | substr $data, 40, 1e9, "..." if 40 < length $data; |
|
|
564 | } |
564 | } |
|
|
565 | |
|
|
566 | substr $data, 40, 1e9, "..." if 40 < length $data; |
565 | |
567 | |
566 | printf "$indent%-16.16s %-6.6s %s\n", $tag, lc $type, $data; |
568 | printf "$indent%-16.16s %-6.6s %s\n", $tag, lc $type, $data; |
567 | } |
569 | } |
568 | } |
570 | } |
569 | } |
571 | } |
… | |
… | |
639 | |
641 | |
640 | Returns the BER type mapped to the given C<$class>/C<$tag> combination. |
642 | Returns the BER type mapped to the given C<$class>/C<$tag> combination. |
641 | |
643 | |
642 | =back |
644 | =back |
643 | |
645 | |
644 | =head2 BER TYPES |
646 | =head2 BER Types |
645 | |
647 | |
646 | This lists the predefined BER types - you can map any C<CLASS>/C<TAG> |
648 | This lists the predefined BER types. BER types are formatters used |
647 | combination to any C<BER_TYPE_*>. |
649 | internally to format and encode BER values. You can assign any C<BER_TYPE> |
|
|
650 | to any C<CLASS>/C<TAG> combination tgo change how that tag is decoded or |
|
|
651 | encoded. |
648 | |
652 | |
649 | =over |
653 | =over |
650 | |
654 | |
651 | =item C<BER_TYPE_BYTES> |
655 | =item C<BER_TYPE_BYTES> |
652 | |
656 | |
… | |
… | |
735 | $SNMP_PROFILE->set (ASN_APPLICATION, SNMP_COUNTER64 , BER_TYPE_INT); |
739 | $SNMP_PROFILE->set (ASN_APPLICATION, SNMP_COUNTER64 , BER_TYPE_INT); |
736 | |
740 | |
737 | =head2 LIMITATIONS/NOTES |
741 | =head2 LIMITATIONS/NOTES |
738 | |
742 | |
739 | This module can only en-/decode 64 bit signed and unsigned integers, and |
743 | This module can only en-/decode 64 bit signed and unsigned integers, and |
740 | only when your perl supports those. |
744 | only when your perl supports those. So no UUID OIDs for now (unless you |
|
|
745 | map the C<OBJECT IDENTIFIER> tag to something other than C<BER_TYPE_OID>). |
741 | |
746 | |
742 | This module does not generally care about ranges, i.e. it will happily |
747 | This module does not generally care about ranges, i.e. it will happily |
743 | de-/encode 64 bit integers into an C<ASN_INTEGER> value, or a negative |
748 | de-/encode 64 bit integers into an C<ASN_INTEGER> value, or a negative |
744 | number into an C<SNMP_COUNTER64>. |
749 | number into an C<SNMP_COUNTER64>. |
745 | |
750 | |
746 | OBJECT IDENTIFIEERs cannot have unlimited length, although the limit is |
751 | OBJECT IDENTIFIEERs cannot have unlimited length, although the limit is |
747 | much larger than e.g. the one imposed by SNMP or other protocols,a nd is |
752 | much larger than e.g. the one imposed by SNMP or other protocols, and is |
748 | about 4kB. |
753 | about 4kB. |
749 | |
754 | |
750 | Indefinite length encoding is not supported. |
755 | Indefinite length encoding is not supported. |
751 | |
756 | |
752 | Constructed strings are decoded just fine, but there should be a way to |
757 | Constructed strings are decoded just fine, but there should be a way to |
753 | join them for convenience. |
758 | join them for convenience. |
754 | |
759 | |
755 | REAL values are not supported and will currently croak. |
760 | REAL values are not supported and will currently croak. |
756 | |
761 | |
757 | The encoder and decoder tend to accept more formats than should be |
762 | The encoder and decoder tend to accept more formats than should be |
758 | strictly supported. |
763 | strictly supported - security sensitive applications are strongly advised |
|
|
764 | to review the code first. |
759 | |
765 | |
760 | This module has undergone little to no testing so far. |
766 | This module has undergone little to no testing so far. |
761 | |
767 | |
762 | =head2 ITHREADS SUPPORT |
768 | =head2 ITHREADS SUPPORT |
763 | |
769 | |