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/*
* Copyright 2014-2024 Real Logic Limited.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package io.aeron.driver.media;
import io.aeron.driver.NameResolver;
import org.agrona.AsciiEncoding;
import org.agrona.Strings;
import java.net.InetAddress;
import java.net.InetSocketAddress;
class SocketAddressParser
{
enum IpV4State
{
HOST, PORT
}
enum IpV6State
{
START_ADDR, HOST, SCOPE, END_ADDR, PORT
}
/**
* Parse socket addresses from a {@link String}.
*
* Supports hostname:port, ipV4Address:port, [ipV6Address]:port, and name.
*
* @param value to be parsed for the socket address.
* @param uriParamName for the parse.
* @param isReResolution for the parse.
* @param nameResolver to be used for resolving hostnames.
* @return An {@link InetSocketAddress} for the parsed input.
*/
static InetSocketAddress parse(
final String value, final String uriParamName, final boolean isReResolution, final NameResolver nameResolver)
{
if (Strings.isEmpty(value))
{
throw new NullPointerException("input string must not be null or empty");
}
final String nameAndPort = nameResolver.lookup(value, uriParamName, isReResolution);
ParseResult result = tryParseIpV4(nameAndPort);
if (null == result)
{
result = tryParseIpV6(nameAndPort);
}
if (null == result)
{
throw new IllegalArgumentException("invalid format: " + nameAndPort);
}
final InetAddress inetAddress = nameResolver.resolve(result.host, uriParamName, isReResolution);
return null == inetAddress ? InetSocketAddress.createUnresolved(result.host, result.port) :
new InetSocketAddress(inetAddress, result.port);
}
static boolean isMulticastAddress(final String hostAndPort)
{
ParseResult result = tryParseIpV4(hostAndPort);
if (null != result)
{
final String host = result.host;
for (int i = 0, dotIndex = 0, end = host.length() - 1; i <= end; i++)
{
final char c = host.charAt(i);
if ('.' == c || end == i)
{
final int length = end == i ? i - dotIndex : i - 1 - dotIndex;
if (length <= 0 || length > 3)
{
return false;
}
if (0 == dotIndex)
{
final int firstByte = AsciiEncoding.parseIntAscii(host, 0, i);
// IPv4 multicast addresses are defined by the most-significant bit pattern of 1110
if (firstByte > 0xFF || 0xE0 != (firstByte & 0xF0))
{
return false;
}
}
dotIndex = i;
}
else if (c < '0' || c > '9')
{
return false;
}
}
return true;
}
else
{
result = tryParseIpV6(hostAndPort);
if (null != result)
{
final String firstByte = result.host.substring(0, 2);
return "ff".equalsIgnoreCase(firstByte);
}
throw new IllegalArgumentException("invalid format: " + hostAndPort);
}
}
private static ParseResult tryParseIpV4(final String str)
{
IpV4State state = IpV4State.HOST;
int separatorIndex = -1;
final int length = str.length();
for (int i = 0; i < length; i++)
{
final char c = str.charAt(i);
switch (state)
{
case HOST:
if (':' == c)
{
separatorIndex = i;
state = IpV4State.PORT;
}
break;
case PORT:
if (c < '0' || '9' < c)
{
return null;
}
break;
}
}
if (-1 != separatorIndex && 1 < length - separatorIndex)
{
final String hostname = str.substring(0, separatorIndex);
final int portIndex = separatorIndex + 1;
final int port = AsciiEncoding.parseIntAscii(str, portIndex, length - portIndex);
return new ParseResult(hostname, port);
}
throw new IllegalArgumentException("address:port is required for ipv4: " + str);
}
private static ParseResult tryParseIpV6(final String str)
{
IpV6State state = IpV6State.START_ADDR;
int portIndex = -1;
int scopeIndex = -1;
final int length = str.length();
for (int i = 0; i < length; i++)
{
final char c = str.charAt(i);
switch (state)
{
case START_ADDR:
if ('[' == c)
{
state = IpV6State.HOST;
}
else
{
return null;
}
break;
case HOST:
if (']' == c)
{
state = IpV6State.END_ADDR;
}
else if ('%' == c)
{
scopeIndex = i;
state = IpV6State.SCOPE;
}
else if (':' != c && (c < 'a' || 'f' < c) && (c < 'A' || 'F' < c) && (c < '0' || '9' < c))
{
return null;
}
break;
case SCOPE:
if (']' == c)
{
state = IpV6State.END_ADDR;
}
else if ('_' != c && '.' != c && '~' != c && '-' != c &&
(c < 'a' || 'z' < c) && (c < 'A' || 'Z' < c) && (c < '0' || '9' < c))
{
return null;
}
break;
case END_ADDR:
if (':' == c)
{
portIndex = i;
state = IpV6State.PORT;
}
else
{
return null;
}
break;
case PORT:
if (c < '0' || '9' < c)
{
return null;
}
break;
}
}
if (-1 != portIndex && 1 < length - portIndex)
{
final String hostname = str.substring(1, scopeIndex != -1 ? scopeIndex : portIndex - 1);
portIndex++;
final int port = AsciiEncoding.parseIntAscii(str, portIndex, length - portIndex);
return new ParseResult(hostname, port);
}
throw new IllegalArgumentException("[address]:port is required for ipv6: " + str);
}
private static final class ParseResult
{
final String host;
final int port;
private ParseResult(final String host, final int port)
{
this.host = host;
this.port = port;
}
}
}