internal static void WriteVersion0Header(byte[] buffer, int offset,
IgmpMessageType igmpMessageType, byte code, uint identifier, IpV4Address groupAddress, ulong accessKey)
{
buffer.Write(offset + Offset.MessageType, (byte)igmpMessageType);
buffer.Write(offset + Offset.Code, code);
buffer.Write(offset + Offset.Version0GroupAddress, groupAddress, Endianity.Big);
buffer.Write(offset + Offset.Identifier, identifier, Endianity.Big);
buffer.Write(offset + Offset.AccessKey, accessKey, Endianity.Big);
WriteChecksum(buffer, offset, Version0HeaderLength);
}
internal static void WriteHeader(byte[] buffer, int offset, IgmpMessageType igmpMessageType, TimeSpan maxResponseTime, IpV4Address groupAddress)
{
ByteArrayExtensions.Write(buffer, offset, (byte)igmpMessageType);
double num = maxResponseTime.TotalSeconds * 10.0;
if (num >= 256.0 || num < 0.0)
{
throw new ArgumentOutOfRangeException("maxResponseTime", (object)maxResponseTime, "must be in the range [" + (object)TimeSpan.Zero + ", " + (string)(object)TimeSpan.FromSeconds(25.5) + "]");
}
ByteArrayExtensions.Write(buffer, offset + 1, (byte)num);
ByteArrayExtensions.Write(buffer, offset + 4, groupAddress, Endianity.Big);
IgmpDatagram.WriteChecksum(buffer, offset, 8);
}
internal static void WriteVersion1PlusSimpleHeader(byte[] buffer, int offset,
IgmpMessageType igmpMessageType, TimeSpan maxResponseTime, IpV4Address groupAddress)
{
buffer.Write(offset + Offset.MessageType, (byte)igmpMessageType);
double numTenthOfASecond = (maxResponseTime.TotalSeconds * 10);
if (numTenthOfASecond >= 256 || numTenthOfASecond < 0)
{
throw new ArgumentOutOfRangeException("maxResponseTime", maxResponseTime, "must be in the range [" + TimeSpan.Zero + ", " + TimeSpan.FromSeconds(255 * 0.1) + "]");
}
buffer.Write(offset + Offset.MaxResponseCode, (byte)numTenthOfASecond);
buffer.Write(offset + Offset.Version1PlusGroupAddress, groupAddress, Endianity.Big);
WriteChecksum(buffer, offset, HeaderLength);
}
internal static void WriteHeader(byte[] buffer, int offset,
IgmpMessageType igmpMessageType, TimeSpan maxResponseTime, IpV4Address groupAddress)
{
buffer.Write(offset + Offset.MessageType, (byte)igmpMessageType);
double numTenthOfASecond = (maxResponseTime.TotalSeconds * 10);
if (numTenthOfASecond >= 256 || numTenthOfASecond < 0)
throw new ArgumentOutOfRangeException("maxResponseTime", maxResponseTime, "must be in the range [" + TimeSpan.Zero + ", " + TimeSpan.FromSeconds(255 * 0.1) + "]");
buffer.Write(offset + Offset.MaxResponseCode, (byte)numTenthOfASecond);
buffer.Write(offset + Offset.GroupAddress, groupAddress, Endianity.Big);
WriteChecksum(buffer, offset, HeaderLength);
}
internal static void WriteVersion0Header(byte[] buffer, int offset,
IgmpMessageType igmpMessageType, byte code, uint identifier, IpV4Address groupAddress, ulong accessKey)
{
buffer.Write(offset + Offset.MessageType, (byte)igmpMessageType);
buffer.Write(offset + Offset.Code, code);
buffer.Write(offset + Offset.Version0GroupAddress, groupAddress, Endianity.Big);
buffer.Write(offset + Offset.Identifier, identifier, Endianity.Big);
buffer.Write(offset + Offset.AccessKey, accessKey, Endianity.Big);
WriteChecksum(buffer, offset, Version0HeaderLength);
}
public static IgmpLayer NextIgmpLayer(this Random random)
{
IgmpMessageType igmpMessageType = random.NextEnum(IgmpMessageType.None, IgmpMessageType.CreateGroupRequestVersion0,
IgmpMessageType.CreateGroupReplyVersion0, IgmpMessageType.JoinGroupRequestVersion0,
IgmpMessageType.JoinGroupReplyVersion0, IgmpMessageType.LeaveGroupRequestVersion0,
IgmpMessageType.LeaveGroupReplyVersion0, IgmpMessageType.ConfirmGroupRequestVersion0,
IgmpMessageType.ConfirmGroupReplyVersion0,
IgmpMessageType.MulticastTraceRouteResponse, IgmpMessageType.MulticastTraceRoute); // todo support IGMP traceroute http://www.ietf.org/proceedings/48/I-D/idmr-traceroute-ipm-07.txt.
IgmpQueryVersion igmpQueryVersion = IgmpQueryVersion.None;
TimeSpan igmpMaxResponseTime = random.NextTimeSpan(TimeSpan.FromSeconds(0.1), TimeSpan.FromSeconds(256 * 0.1) - TimeSpan.FromTicks(1));
IpV4Address igmpGroupAddress = random.NextIpV4Address();
bool? igmpIsSuppressRouterSideProcessing;
byte? igmpQueryRobustnessVariable;
TimeSpan? igmpQueryInterval;
IpV4Address[] igmpSourceAddresses;
IgmpGroupRecord[] igmpGroupRecords;
switch (igmpMessageType)
{
case IgmpMessageType.MembershipQuery:
igmpQueryVersion = random.NextEnum(IgmpQueryVersion.None, IgmpQueryVersion.Unknown);
switch (igmpQueryVersion)
{
case IgmpQueryVersion.Version1:
return(new IgmpQueryVersion1Layer
{
GroupAddress = igmpGroupAddress
});
case IgmpQueryVersion.Version2:
return(new IgmpQueryVersion2Layer
{
MaxResponseTime = igmpMaxResponseTime,
GroupAddress = igmpGroupAddress
});
case IgmpQueryVersion.Version3:
igmpIsSuppressRouterSideProcessing = random.NextBool();
igmpQueryRobustnessVariable = random.NextByte(8);
igmpMaxResponseTime = random.NextTimeSpan(TimeSpan.FromSeconds(0.1),
IgmpDatagram.MaxVersion3MaxResponseTime - TimeSpan.FromTicks(1));
igmpQueryInterval = random.NextTimeSpan(TimeSpan.Zero, IgmpDatagram.MaxQueryInterval - TimeSpan.FromTicks(1));
igmpSourceAddresses = random.NextIpV4Addresses(random.Next(1000));
return(new IgmpQueryVersion3Layer
{
SourceAddresses = igmpSourceAddresses.AsReadOnly(),
MaxResponseTime = igmpMaxResponseTime,
GroupAddress = igmpGroupAddress,
IsSuppressRouterSideProcessing = igmpIsSuppressRouterSideProcessing.Value,
QueryRobustnessVariable = igmpQueryRobustnessVariable.Value,
QueryInterval = igmpQueryInterval.Value,
});
default:
throw new InvalidOperationException("Invalid Query Version " + igmpQueryVersion);
}
case IgmpMessageType.MembershipReportVersion1:
return(new IgmpReportVersion1Layer
{
GroupAddress = igmpGroupAddress
});
case IgmpMessageType.MembershipReportVersion2:
return(new IgmpReportVersion2Layer
{
MaxResponseTime = igmpMaxResponseTime,
GroupAddress = igmpGroupAddress
});
case IgmpMessageType.LeaveGroupVersion2:
return(new IgmpLeaveGroupVersion2Layer
{
MaxResponseTime = igmpMaxResponseTime,
GroupAddress = igmpGroupAddress
});
case IgmpMessageType.MembershipReportVersion3:
igmpGroupRecords = random.NextIgmpGroupRecords(random.Next(100));
if (igmpGroupRecords.Count() == 0 && random.NextBool())
{
return(new IgmpReportVersion3Layer());
}
return(new IgmpReportVersion3Layer
{
GroupRecords = igmpGroupRecords.AsReadOnly()
});
default:
throw new InvalidOperationException("Invalid message type " + igmpMessageType);
}
}
public static IgmpLayer NextIgmpLayer(this Random random)
{
IgmpMessageType igmpMessageType = random.NextEnum(IgmpMessageType.None,
IgmpMessageType.MulticastTraceRouteResponse, IgmpMessageType.MulticastTraceRoute); // todo support IGMP traceroute http://www.ietf.org/proceedings/48/I-D/idmr-traceroute-ipm-07.txt.
TimeSpan igmpMaxResponseTime = random.NextTimeSpan(TimeSpan.FromSeconds(0.1), TimeSpan.FromSeconds(256 * 0.1) - TimeSpan.FromTicks(1));
IpV4Address igmpGroupAddress = random.NextIpV4Address();
ulong accessKey = random.NextULong();
uint identifier = random.NextUInt();
switch (igmpMessageType)
{
case IgmpMessageType.CreateGroupRequestVersion0:
return(new IgmpCreateGroupRequestVersion0Layer
{
CreateGroupRequestCode = random.NextEnum <IgmpVersion0CreateGroupRequestCode>(),
Identifier = identifier,
});
case IgmpMessageType.CreateGroupReplyVersion0:
case IgmpMessageType.JoinGroupReplyVersion0:
case IgmpMessageType.LeaveGroupReplyVersion0:
case IgmpMessageType.ConfirmGroupReplyVersion0:
IgmpVersion0ReplyCode code = random.NextEnum <IgmpVersion0ReplyCode>();
return(new IgmpReplyVersion0Layer
{
MessageType = igmpMessageType,
Code = code,
RetryInThisManySeconds = (byte)(code == IgmpVersion0ReplyCode.RequestPendingRetryInThisManySeconds? random.NextByte((byte)IgmpVersion0ReplyCode.RequestPendingRetryInThisManySeconds, byte.MaxValue) : 0),
Identifier = identifier,
GroupAddress = igmpGroupAddress,
AccessKey = accessKey,
});
case IgmpMessageType.JoinGroupRequestVersion0:
case IgmpMessageType.LeaveGroupRequestVersion0:
return(new IgmpRequestVersion0Layer
{
MessageType = igmpMessageType,
Identifier = identifier,
GroupAddress = igmpGroupAddress,
AccessKey = accessKey,
});
case IgmpMessageType.ConfirmGroupRequestVersion0:
return(new IgmpConfirmGroupRequestVersion0Layer
{
GroupAddress = igmpGroupAddress,
AccessKey = accessKey,
});
case IgmpMessageType.MembershipQuery:
IgmpQueryVersion igmpQueryVersion = random.NextEnum(IgmpQueryVersion.None, IgmpQueryVersion.Unknown);
switch (igmpQueryVersion)
{
case IgmpQueryVersion.Version1:
return(new IgmpQueryVersion1Layer
{
GroupAddress = igmpGroupAddress
});
case IgmpQueryVersion.Version2:
return(new IgmpQueryVersion2Layer
{
MaxResponseTime = igmpMaxResponseTime,
GroupAddress = igmpGroupAddress
});
case IgmpQueryVersion.Version3:
bool igmpIsSuppressRouterSideProcessing = random.NextBool();
byte igmpQueryRobustnessVariable = random.NextByte(8);
igmpMaxResponseTime = random.NextTimeSpan(TimeSpan.FromSeconds(0.1),
IgmpDatagram.MaxVersion3MaxResponseTime - TimeSpan.FromTicks(1));
TimeSpan igmpQueryInterval = random.NextTimeSpan(TimeSpan.Zero, IgmpDatagram.MaxQueryInterval - TimeSpan.FromTicks(1));
IpV4Address[] igmpSourceAddresses = random.NextIpV4Addresses(random.Next(1000));
return(new IgmpQueryVersion3Layer
{
SourceAddresses = igmpSourceAddresses.AsReadOnly(),
MaxResponseTime = igmpMaxResponseTime,
GroupAddress = igmpGroupAddress,
IsSuppressRouterSideProcessing = igmpIsSuppressRouterSideProcessing,
QueryRobustnessVariable = igmpQueryRobustnessVariable,
QueryInterval = igmpQueryInterval,
});
default:
throw new InvalidOperationException("Invalid Query Version " + igmpQueryVersion);
}
case IgmpMessageType.MembershipReportVersion1:
return(new IgmpReportVersion1Layer
{
GroupAddress = igmpGroupAddress
});
case IgmpMessageType.MembershipReportVersion2:
return(new IgmpReportVersion2Layer
{
MaxResponseTime = igmpMaxResponseTime,
GroupAddress = igmpGroupAddress
});
case IgmpMessageType.LeaveGroupVersion2:
return(new IgmpLeaveGroupVersion2Layer
{
MaxResponseTime = igmpMaxResponseTime,
GroupAddress = igmpGroupAddress
});
case IgmpMessageType.MembershipReportVersion3:
IgmpGroupRecord[] igmpGroupRecords = random.NextIgmpGroupRecords(random.Next(100));
if (!igmpGroupRecords.Any() && random.NextBool())
{
return(new IgmpReportVersion3Layer());
}
return(new IgmpReportVersion3Layer
{
GroupRecords = igmpGroupRecords.AsReadOnly()
});
default:
throw new InvalidOperationException("Invalid message type " + igmpMessageType);
}
}
