io.aeron.driver.media.SocketAddressParser Maven / Gradle / Ivy
/*
* Copyright 2014-2020 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;
import java.net.UnknownHostException;
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.
* @throws UnknownHostException if address cannot be resolved.
*/
static InetSocketAddress parse(
final String value, final String uriParamName, final boolean isReResolution, final NameResolver nameResolver)
throws UnknownHostException
{
if (Strings.isEmpty(value))
{
throw new NullPointerException("input string must not be null or empty");
}
final String nameAndPort = nameResolver.lookup(value, uriParamName, isReResolution);
InetSocketAddress address = tryParseIpV4(nameAndPort, uriParamName, isReResolution, nameResolver);
if (null == address)
{
address = tryParseIpV6(nameAndPort, uriParamName, isReResolution, nameResolver);
}
if (null == address)
{
throw new IllegalArgumentException("invalid format: " + value);
}
if (address.isUnresolved())
{
throw new UnknownHostException(
"Unresolved - " + uriParamName + "=" + value + ", name-and-port=" + nameAndPort +
", name-resolver=" + nameResolver.getClass().getName());
}
return address;
}
private static InetSocketAddress tryParseIpV4(
final String str, final String uriParamName, final boolean isReResolution, final NameResolver nameResolver)
{
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)
{
return null;
}
else if (c < '0' || '9' < c)
{
return null;
}
}
}
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);
final InetAddress inetAddress = nameResolver.resolve(hostname, uriParamName, isReResolution);
return (null == inetAddress) ?
InetSocketAddress.createUnresolved(hostname, port) :
new InetSocketAddress(inetAddress, port);
}
throw new IllegalArgumentException("'port' part of the address is required for ipv4: " + str);
}
private static InetSocketAddress tryParseIpV6(
final String str, final String uriParamName, final boolean isReResolution, final NameResolver nameResolver)
{
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)
{
return null;
}
else if (c < '0' || '9' < c)
{
return null;
}
}
}
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);
final InetAddress inetAddress = nameResolver.resolve(hostname, uriParamName, isReResolution);
return null == inetAddress ?
InetSocketAddress.createUnresolved(hostname, port) :
new InetSocketAddress(inetAddress, port);
}
throw new IllegalArgumentException("'port' part of the address is required for ipv6: " + str);
}
}