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69 | |
69 | |
70 | my $buf = ber_encode $ber, $Convert::BER::XS::SNMP_PROFILE; |
70 | my $buf = ber_encode $ber, $Convert::BER::XS::SNMP_PROFILE; |
71 | |
71 | |
72 | =head1 DESCRIPTION |
72 | =head1 DESCRIPTION |
73 | |
73 | |
74 | WARNING: Before release 1.0, the API is not considered stable in any way. |
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75 | |
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76 | This module implements a I<very> low level BER/DER en-/decoder. |
74 | This module implements a I<very> low level BER/DER en-/decoder. |
77 | |
75 | |
78 | It is tuned for low memory and high speed, while still maintaining some |
76 | It is tuned for low memory and high speed, while still maintaining some |
79 | level of user-friendlyness. |
77 | level of user-friendlyness. |
80 | |
78 | |
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409 | use common::sense; |
407 | use common::sense; |
410 | |
408 | |
411 | use XSLoader (); |
409 | use XSLoader (); |
412 | use Exporter qw(import); |
410 | use Exporter qw(import); |
413 | |
411 | |
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412 | use Carp (); |
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413 | |
414 | our $VERSION; |
414 | our $VERSION; |
415 | |
415 | |
416 | BEGIN { |
416 | BEGIN { |
417 | $VERSION = 1.11; |
417 | $VERSION = 1.21; |
418 | XSLoader::load __PACKAGE__, $VERSION; |
418 | XSLoader::load __PACKAGE__, $VERSION; |
419 | } |
419 | } |
420 | |
420 | |
421 | our %EXPORT_TAGS = ( |
421 | our %EXPORT_TAGS = ( |
422 | const_index => [qw( |
422 | const_index => [qw( |
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468 | |
468 | |
469 | $SNMP_PROFILE->set (ASN_APPLICATION, SNMP_IPADDRESS , BER_TYPE_IPADDRESS); |
469 | $SNMP_PROFILE->set (ASN_APPLICATION, SNMP_IPADDRESS , BER_TYPE_IPADDRESS); |
470 | $SNMP_PROFILE->set (ASN_APPLICATION, SNMP_COUNTER32 , BER_TYPE_INT); |
470 | $SNMP_PROFILE->set (ASN_APPLICATION, SNMP_COUNTER32 , BER_TYPE_INT); |
471 | $SNMP_PROFILE->set (ASN_APPLICATION, SNMP_UNSIGNED32, BER_TYPE_INT); |
471 | $SNMP_PROFILE->set (ASN_APPLICATION, SNMP_UNSIGNED32, BER_TYPE_INT); |
472 | $SNMP_PROFILE->set (ASN_APPLICATION, SNMP_TIMETICKS , BER_TYPE_INT); |
472 | $SNMP_PROFILE->set (ASN_APPLICATION, SNMP_TIMETICKS , BER_TYPE_INT); |
473 | $SNMP_PROFILE->set (ASN_APPLICATION, SNMP_OPAQUE , BER_TYPE_IPADDRESS); |
473 | |
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474 | # decodes REAL values according to ECMA-63 |
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475 | # this is pretty strict, except it doesn't catch -0. |
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476 | # I don't have access to ISO 6093 (or BS 6727, or ANSI X.3-42)), so this is all guesswork. |
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477 | sub _decode_real_decimal { |
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478 | my ($format, $val) = @_; |
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479 | |
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480 | $val =~ y/,/./; # probably not in ISO-6093 |
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481 | |
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482 | if ($format == 1) { |
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483 | $val =~ /^ \ * [+-]? [0-9]+ \z/x |
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484 | or Carp::croak "BER_TYPE_REAL NR1 value not in NR1 format ($val) (X.690 8.5.8)"; |
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485 | } elsif ($format == 2) { |
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486 | $val =~ /^ \ * [+-]? (?: [0-9]+\.[0-9]* | [0-9]*\.[0-9]+ ) \z/x |
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487 | or Carp::croak "BER_TYPE_REAL NR2 value not in NR2 format ($val) (X.690 8.5.8)"; |
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488 | } elsif ($format == 3) { |
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489 | $val =~ /^ \ * [+-] (?: [0-9]+\.[0-9]* | [0-9]*\.[0-9]+ ) [eE] [+-]? [0-9]+ \z/x |
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490 | or Carp::croak "BER_TYPE_REAL NR3 value not in NR3 format ($val) (X.690 8.5.8)"; |
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491 | } else { |
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492 | Carp::croak "BER_TYPE_REAL invalid decimal numerical representation format $format"; |
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493 | } |
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494 | |
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495 | $val |
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496 | } |
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497 | |
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498 | # this is a mess, but perl's support for floating point formatting is nearly nonexistant |
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499 | sub _encode_real_decimal { |
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500 | my ($val, $nvdig) = @_; |
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501 | |
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502 | $val = sprintf "%.*G", $nvdig + 1, $val; |
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503 | |
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504 | if ($val =~ /E/) { |
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505 | $val =~ s/E(?=[^+-])/E+/; |
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506 | $val =~ s/E/.E/ if $val !~ /\./; |
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507 | $val =~ s/^/+/ unless $val =~ /^-/; |
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508 | |
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509 | return "\x03$val" # NR3 |
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510 | } |
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511 | |
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512 | $val =~ /\./ |
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513 | ? "\x02$val" # NR2 |
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514 | : "\x01$val" # NR1 |
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515 | } |
474 | |
516 | |
475 | =head2 DEBUGGING |
517 | =head2 DEBUGGING |
476 | |
518 | |
477 | To aid debugging, you cna call the C<ber_dump> function to print a "nice" |
519 | To aid debugging, you can call the C<ber_dump> function to print a "nice" |
478 | representation to STDOUT. |
520 | representation to STDOUT. |
479 | |
521 | |
480 | =over |
522 | =over |
481 | |
523 | |
482 | =item ber_dump $tuple[, $profile[, $prefix]] |
524 | =item ber_dump $tuple[, $profile[, $prefix]] |
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685 | dot, e.g. C<1.3.6.1.213>. |
727 | dot, e.g. C<1.3.6.1.213>. |
686 | |
728 | |
687 | =item C<BER_TYPE_RELOID> |
729 | =item C<BER_TYPE_RELOID> |
688 | |
730 | |
689 | Same as C<BER_TYPE_OID> but uses relative object identifier |
731 | Same as C<BER_TYPE_OID> but uses relative object identifier |
690 | encoding: ASN.1 has this hack of encoding the first two OID components |
732 | encoding: ASN.1 uses some hack encoding of the first two OID components |
691 | into a single integer in a weird attempt to save an insignificant amount |
733 | into a single integer in a weird attempt to save an insignificant amount |
692 | of space in an otherwise wasteful encoding, and relative OIDs are |
734 | of space in an otherwise wasteful encoding, and relative OIDs are |
693 | basically OIDs without this hack. The practical difference is that the |
735 | basically OIDs without this hack. The practical difference is that the |
694 | second component of an OID can only have the values 1..40, while relative |
736 | second component of an OID can only have the values 1..40, while relative |
695 | OIDs do not have this restriction. |
737 | OIDs do not have this restriction. |
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733 | |
775 | |
734 | $SNMP_PROFILE->set (ASN_APPLICATION, SNMP_IPADDRESS , BER_TYPE_IPADDRESS); |
776 | $SNMP_PROFILE->set (ASN_APPLICATION, SNMP_IPADDRESS , BER_TYPE_IPADDRESS); |
735 | $SNMP_PROFILE->set (ASN_APPLICATION, SNMP_COUNTER32 , BER_TYPE_INT); |
777 | $SNMP_PROFILE->set (ASN_APPLICATION, SNMP_COUNTER32 , BER_TYPE_INT); |
736 | $SNMP_PROFILE->set (ASN_APPLICATION, SNMP_UNSIGNED32, BER_TYPE_INT); |
778 | $SNMP_PROFILE->set (ASN_APPLICATION, SNMP_UNSIGNED32, BER_TYPE_INT); |
737 | $SNMP_PROFILE->set (ASN_APPLICATION, SNMP_TIMETICKS , BER_TYPE_INT); |
779 | $SNMP_PROFILE->set (ASN_APPLICATION, SNMP_TIMETICKS , BER_TYPE_INT); |
738 | $SNMP_PROFILE->set (ASN_APPLICATION, SNMP_OPAQUE , BER_TYPE_IPADDRESS); |
780 | $SNMP_PROFILE->set (ASN_APPLICATION, SNMP_OPAQUE , BER_TYPE_BYTES); |
739 | $SNMP_PROFILE->set (ASN_APPLICATION, SNMP_COUNTER64 , BER_TYPE_INT); |
781 | $SNMP_PROFILE->set (ASN_APPLICATION, SNMP_COUNTER64 , BER_TYPE_INT); |
740 | |
782 | |
741 | =head2 LIMITATIONS/NOTES |
783 | =head2 LIMITATIONS/NOTES |
742 | |
784 | |
743 | This module can only en-/decode 64 bit signed and unsigned integers, and |
785 | This module can only en-/decode 64 bit signed and unsigned |
744 | only when your perl supports those. So no UUID OIDs for now (unless you |
786 | integers/tags/lengths, and only when your perl supports those. So no UUID |
745 | map the C<OBJECT IDENTIFIER> tag to something other than C<BER_TYPE_OID>). |
787 | OIDs for now (unless you map the C<OBJECT IDENTIFIER> tag to something |
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788 | other than C<BER_TYPE_OID>). |
746 | |
789 | |
747 | This module does not generally care about ranges, i.e. it will happily |
790 | This module does not generally care about ranges, i.e. it will happily |
748 | de-/encode 64 bit integers into an C<ASN_INTEGER> value, or a negative |
791 | de-/encode 64 bit integers into an C<SNMP_UNSIGNED32> value, or a negative |
749 | number into an C<SNMP_COUNTER64>. |
792 | number into an C<SNMP_COUNTER64>. |
750 | |
793 | |
751 | OBJECT IDENTIFIEERs cannot have unlimited length, although the limit is |
794 | OBJECT IDENTIFIEERs cannot have unlimited length, although the limit is |
752 | much larger than e.g. the one imposed by SNMP or other protocols, and is |
795 | much larger than e.g. the one imposed by SNMP or other protocols, and is |
753 | about 4kB. |
796 | about 4kB. |
754 | |
797 | |
755 | Indefinite length encoding is not supported. |
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756 | |
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757 | Constructed strings are decoded just fine, but there should be a way to |
798 | Constructed strings are decoded just fine, but there should be a way to |
758 | join them for convenience. |
799 | join them for convenience. |
759 | |
800 | |
760 | REAL values are not supported and will currently croak. |
801 | REAL values will always be encoded in decimal form and ssometimes is |
761 | |
802 | forced into a perl "NV" type, potentially losing precision. |
762 | The encoder and decoder tend to accept more formats than should be |
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763 | strictly supported - security sensitive applications are strongly advised |
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764 | to review the code first. |
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765 | |
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766 | This module has undergone little to no testing so far. |
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767 | |
803 | |
768 | =head2 ITHREADS SUPPORT |
804 | =head2 ITHREADS SUPPORT |
769 | |
805 | |
770 | This module is unlikely to work when the (officially discouraged) ithreads |
806 | This module is unlikely to work in any other than the loading thread when |
771 | are in use. |
807 | the (officially discouraged) ithreads are in use. |
772 | |
808 | |
773 | =head1 AUTHOR |
809 | =head1 AUTHOR |
774 | |
810 | |
775 | Marc Lehmann <schmorp@schmorp.de> |
811 | Marc Lehmann <schmorp@schmorp.de> |
776 | http://software.schmorp.de/pkg/Convert-BER-XS |
812 | http://software.schmorp.de/pkg/Convert-BER-XS |