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require 'test/unit'
require 'snmp/varbind'
require 'snmp/ber'
class ASN1_Test < Test::Unit::TestCase
include SNMP::BER
def test_decode_tlv_empty
tag, value, data = decode_tlv("\001\000")
assert_equal(1, tag)
assert_equal("", value)
assert_equal("", data)
tag, value, data = decode_tlv("\001\000\111")
assert_equal(1, tag)
assert_equal("", value)
assert_equal("\111", data)
end
# Decode TLV data with the short-format length field.
def test_decode_tlv_short
tag, value, data = decode_tlv("\001\002\023\044")
assert_equal(1, tag)
assert_equal("\023\044", value)
assert_equal("", data)
end
# Extra bytes of data are returned.
def test_decode_tlv_short_extra
tag, value, data = decode_tlv("\001\002\023\044\000")
assert_equal(1, tag)
assert_equal("\023\044", value)
assert_equal("\000", data)
end
# Decode TLV data with long-format length field
def test_decode_tlv_long
long_data = ""; 128.times { |i| long_data << i.chr }
tag, value, data = decode_tlv("\001\201\200" + long_data)
assert_equal(1, tag)
assert_equal(long_data, value)
assert_equal("", data)
end
# Long format with extra bytes - use four bytes for length
def test_decode_tlv_long_extra
long_data = ""; 129.times { |i| long_data << i.chr }
tag, value, data = decode_tlv("\001\204\000\000\000\201" + long_data + "\123\123\123")
assert_equal(1, tag)
assert_equal(long_data, value)
assert_equal("\123\123\123", data)
end
# Check invalid length - ASN.1 says that first length octet can't be 255.
def test_bad_length
assert_raise(InvalidLength) {
decode_tlv("\001\377\001")
}
end
# Check if input data is too short
def test_out_of_data
assert_raise(OutOfData) {
decode_tlv("\001\001")
}
assert_raise(OutOfData) {
decode_tlv("\001")
}
assert_raise(OutOfData) {
decode_tlv("")
}
end
# Decode single-octet ASN.1 integer.
# Number is negative (2's complement) if high order bit is 1.
def test_decode_integer_octet
i, data = decode_integer("\002\001\042")
assert_equal(34, i)
assert_equal("", data)
i, data = decode_integer("\002\001\377")
assert_equal(-1, i)
assert_equal("", data)
end
# Decode multi-octet ASN.1 integer.
def test_decode_integer
i, data = decode_integer("\002\004\001\002\003\004")
assert_equal(16909060, i)
assert_equal("", data)
i, data = decode_integer("\002\004\377\377\377\376")
assert_equal(-2, i)
assert_equal("", data)
i, data = decode_integer("\002\003\000\377\376")
assert_equal(65534, i)
assert_equal("", data)
i, data = decode_integer("\002\002\000\377")
assert_equal(255, i)
assert_equal("", data)
assert_raise(InvalidTag) {
decode_integer("\001\004\001\002\003\004")
}
end
def test_decode_timeticks
i, data = decode_timeticks("\103\004\001\002\003\004")
assert_equal(16909060, i)
assert_equal("", data)
assert_raise(InvalidTag) {
decode_timeticks("\002\004\001\002\003\004")
}
end
# Decode ASN.1 octet string
def test_decode_octet_string
s, data = decode_octet_string("\004\202\000\005hello")
assert_equal("hello",s)
assert_raise(InvalidTag) {
decode_octet_string("\005\202\000\005hello")
}
end
def test_decode_ip_address
ip, data = decode_ip_address("@\004\001\002\003\004")
assert_equal(ip, "\001\002\003\004")
assert_raise(InvalidTag) {
decode_ip_address("\004\004\001\002\003\004")
}
assert_raise(InvalidLength) {
decode_ip_address("@\005\001\002\003\004\005")
}
end
# Decode ASN.1 sequence
def test_decode_sequence
seq, data = decode_sequence("\060\003\002\001\077")
assert_equal("\002\001\077", seq)
assert_equal("", data)
seq, data = decode_sequence("\060\003\002\001\077\002\001\001")
assert_equal("\002\001\077", seq)
assert_equal("\002\001\001", data)
assert_raise(InvalidTag) {
decode_sequence("\061\003\002\001\077")
}
end
def test_decode_object_id
# Handle an empty object identifier because net-snmp does it and
# they probably had a good reason.
object_id, remainder = decode_object_id("\006\000")
assert_equal([], object_id)
assert_equal("", remainder)
object_id, remainder = decode_object_id("\006\001+")
assert_equal([1,3], object_id);
assert_equal("", remainder)
object_id, remainder = decode_object_id("\006\002+\006")
assert_equal([1,3,6], object_id);
assert_equal("", remainder)
object_id, remainder = decode_object_id("\006\003+\202\001")
assert_equal([1,3,257], object_id);
assert_equal("", remainder)
object_id, remainder = decode_object_id("\006\003S\202\001")
assert_equal([2,3,257], object_id);
assert_equal("", remainder)
object_id, remainder = decode_object_id("\006\001\000")
assert_equal([0,0], object_id);
assert_equal("", remainder)
assert_raise(InvalidTag) do
decode_object_id("\007\001+")
end
end
def test_encode_length
assert_equal("\000", encode_length(0))
assert_equal("\001", encode_length(1))
assert_equal("\177", encode_length(127))
assert_equal("\201\200", encode_length(128))
assert_equal("\202\002\001", encode_length(513))
assert_raise(InvalidLength) { encode_length(-1) }
end
def test_encode_integer
assert_equal("\002\001\000", encode_integer(0))
assert_equal("\002\001\001", encode_integer(1))
assert_equal("\002\001\177", encode_integer(127))
assert_equal("\002\002\000\200", encode_integer(128))
assert_equal("\002\002\000\377", encode_integer(255))
assert_equal("\002\002\001\000", encode_integer(256))
assert_equal("\002\001\377", encode_integer(-1))
assert_equal("\002\001\200", encode_integer(-128))
assert_equal("\002\002\377\177", encode_integer(-129))
end
def test_encode_octet_string
assert_equal("\004\015Dave was here", encode_octet_string("Dave was here"))
assert_equal("\004\000", encode_octet_string(""))
end
def test_encode_sequence
assert_equal("0\015Dave was here", encode_sequence("Dave was here"))
assert_equal("0\000", encode_sequence(""))
end
def test_encode_null
assert_equal("\005\000", encode_null)
end
def test_encode_exception
assert_equal("\200\000", encode_exception(0x80))
end
def test_encode_object_id
assert_equal("\006\001" << 80.chr, encode_object_id([2]))
assert_equal("\006\001\000", encode_object_id([0,0]))
assert_equal("\006\001+", encode_object_id([1,3]))
assert_equal("\006\002+\006", encode_object_id([1,3,6]))
assert_equal("\006\003+\202\001", encode_object_id([1,3,257]))
assert_equal("\006\003" << 82.chr << "\202\001", encode_object_id([2,2,257]))
assert_raise(InvalidObjectId) { encode_object_id([3,2,257]) }
assert_raise(InvalidObjectId) { encode_object_id([]) }
assert_equal("\006\a+\203\377\177\203\377\177",
encode_object_id(SNMP::ObjectId.new("1.3.65535.65535")))
end
end
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