[ruby/ipaddr] ntop: Measure address size in bytes
`IPAddr.ntop` takes the binary representation of an IP address, whose length should be 4 or 16 *bytes* (not characters/codepoints). The current implementation accepts strings in any encoding, but for some values in non-BINARY encoding, it fails proper length check and raises an `AddressFamilyError`. Since passing strings in a multibyte encoding has never worked correctly for years, this patch makes it an explicit error with an `InvalidAddressError`. Fixes: https://github.com/ruby/ipaddr/issues/56 https://github.com/ruby/ipaddr/commit/a33fd14d4a
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@ -110,8 +110,13 @@ class IPAddr
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# Convert a network byte ordered string form of an IP address into
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# human readable form.
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# It expects the string to be encoded in Encoding::ASCII_8BIT (BINARY).
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def self.ntop(addr)
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case addr.size
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if addr.is_a?(String) && addr.encoding != Encoding::BINARY
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raise InvalidAddressError, "invalid encoding (given #{addr.encoding}, expected BINARY)"
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end
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case addr.bytesize
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when 4
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addr.unpack('C4').join('.')
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when 16
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@ -133,18 +133,37 @@ class TC_IPAddr < Test::Unit::TestCase
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def test_ntop
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# IPv4
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assert_equal("192.168.1.1", IPAddr.ntop("\xC0\xA8\x01\x01"))
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assert_equal("192.168.1.1", IPAddr.ntop("\xC0\xA8\x01\x01".b))
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assert_equal("10.231.140.171", IPAddr.ntop("\x0A\xE7\x8C\xAB".b))
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# IPv6
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assert_equal("0000:0000:0000:0000:0000:0000:0000:0001",
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IPAddr.ntop("\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01"))
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IPAddr.ntop("\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01".b))
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assert_equal("fe80:0000:0000:0000:f09f:9985:f09f:9986",
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IPAddr.ntop("\xFE\x80\x00\x00\x00\x00\x00\x00\xF0\x9F\x99\x85\xF0\x9F\x99\x86".b))
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# Invalid parameters
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## wrong length
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assert_raise(IPAddr::AddressFamilyError) {
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IPAddr.ntop("192.168.1.1".b)
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}
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assert_raise(IPAddr::AddressFamilyError) {
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IPAddr.ntop("\xC0\xA8\x01\xFF1".b)
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}
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## UTF-8
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assert_raise(IPAddr::InvalidAddressError) {
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IPAddr.ntop("192.168.1.1")
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}
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assert_raise(IPAddr::AddressFamilyError) {
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IPAddr.ntop("\xC0\xA8\x01\xFF1")
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assert_raise(IPAddr::InvalidAddressError) {
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IPAddr.ntop("\x0A\x0A\x0A\x0A")
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}
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assert_raise(IPAddr::InvalidAddressError) {
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IPAddr.ntop("\x0A\xE7\x8C\xAB")
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}
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assert_raise(IPAddr::InvalidAddressError) {
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IPAddr.ntop("\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01")
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}
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assert_raise(IPAddr::InvalidAddressError) {
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IPAddr.ntop("\xFE\x80\x00\x00\x00\x00\x00\x00\xF0\x9F\x99\x85\xF0\x9F\x99\x86")
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}
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end
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