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1 package com.trilead.ssh2.packets;
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2
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3 import java.io.IOException;
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4
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5 /**
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6 * PacketOpenSessionChannel.
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7 *
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8 * @author Christian Plattner, plattner@trilead.com
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9 * @version $Id: PacketOpenSessionChannel.java,v 1.1 2007/10/15 12:49:55 cplattne Exp $
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10 */
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11 public class PacketOpenSessionChannel {
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12 byte[] payload;
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13
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14 int channelID;
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15 int initialWindowSize;
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16 int maxPacketSize;
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17
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18 public PacketOpenSessionChannel(int channelID, int initialWindowSize,
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19 int maxPacketSize) {
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20 this.channelID = channelID;
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21 this.initialWindowSize = initialWindowSize;
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22 this.maxPacketSize = maxPacketSize;
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23 }
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24
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25 public PacketOpenSessionChannel(byte payload[], int off, int len) throws IOException {
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26 this.payload = new byte[len];
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27 System.arraycopy(payload, off, this.payload, 0, len);
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28 TypesReader tr = new TypesReader(payload);
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29 int packet_type = tr.readByte();
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30
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31 if (packet_type != Packets.SSH_MSG_CHANNEL_OPEN)
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32 throw new IOException("This is not a SSH_MSG_CHANNEL_OPEN! ("
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33 + packet_type + ")");
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34
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35 channelID = tr.readUINT32();
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36 initialWindowSize = tr.readUINT32();
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37 maxPacketSize = tr.readUINT32();
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38
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39 if (tr.remain() != 0)
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40 throw new IOException("Padding in SSH_MSG_CHANNEL_OPEN packet!");
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41 }
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42
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43 public byte[] getPayload() {
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44 if (payload == null) {
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45 TypesWriter tw = new TypesWriter();
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46 tw.writeByte(Packets.SSH_MSG_CHANNEL_OPEN);
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47 tw.writeString("session");
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48 tw.writeUINT32(channelID);
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49 tw.writeUINT32(initialWindowSize);
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50 tw.writeUINT32(maxPacketSize);
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51 payload = tw.getBytes();
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52 }
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53
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54 return payload;
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55 }
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56 }
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