Function ParseIpMask

lib/base/utility.cpp:178–218

}

static void ParseIpMask(const String& ip, char mask[16], int *bits)
{
	String::SizeType slashp = ip.FindFirstOf("/");
	String uip;

	if (slashp == String::NPos) {
		uip = ip;
		*bits = 0;
	} else {
		uip = ip.SubStr(0, slashp);
		*bits = Convert::ToLong(ip.SubStr(slashp + 1));
	}

	int proto;

	if (!ParseIp(uip, mask, &proto))
		BOOST_THROW_EXCEPTION(std::invalid_argument("Invalid IP address specified."));

	if (proto == AF_INET) {
		if (*bits > 32 || *bits < 0)
			BOOST_THROW_EXCEPTION(std::invalid_argument("Mask must be between 0 and 32 for IPv4 CIDR masks."));

		*bits += 96;
	}

	if (slashp == String::NPos)
		*bits = 128;

	if (*bits > 128 || *bits < 0)
		BOOST_THROW_EXCEPTION(std::invalid_argument("Mask must be between 0 and 128 for IPv6 CIDR masks."));

	for (int i = 0; i < 16; i++) {
		int lbits = std::max(0, *bits - i * 8);

		if (lbits >= 8)
			continue;

		if (mask[i] & (0xff >> lbits))
			BOOST_THROW_EXCEPTION(std::invalid_argument("Masked-off bits must all be zero."));
	}
}

static bool IpMaskCheck(char addr[16], char mask[16], int bits)
{