Store Java raw InputStream data as PCAP to view in Wireshark
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I'm trying to build a transparent proxy in Java with the ability to record data that passed through to be viewed later in wireshark.
I was able to get the proxy working correctly with this snippet
private static final int BUFFER_SIZE = 8192;
...
public void run() {
PcapHandle handle = null;
PcapDumper dumper;
try {
InetAddress addr = InetAddress.getByName("localhost");
PcapNetworkInterface nif = Pcaps.getDevByAddress(addr);
int snapLen = 65536;
PcapNetworkInterface.PromiscuousMode mode = PcapNetworkInterface.PromiscuousMode.PROMISCUOUS;
int timeout = 10;
handle = nif.openLive(snapLen, mode, timeout);
dumper = handle.dumpOpen("cap.pcap");
byte buffer = new byte[BUFFER_SIZE];
try {
while (true) {
int bytesRead = mInputStream.read(buffer);
if (bytesRead == -1)
break; // End of stream is reached --> exit
mOutputStream.write(buffer, 0, bytesRead);
dumper.dumpRaw(Arrays.copyOfRange(buffer, 0, bytesRead));
mOutputStream.flush();
}
} catch (IOException e) {
// Read/write failed --> connection is broken
}
dumper.close();
} catch (PcapNativeException e) {
e.printStackTrace();
} catch (UnknownHostException e) {
e.printStackTrace();
} catch (NotOpenException e) {
e.printStackTrace();
}
}
As you may notice I'm using Pcap4J to store raw bytes into a pcap file. The saving of the bytes works well but when I try to open it on wireshark it shows this message:
Error
And every packet shows as malformed. Ideally I would be seeing TCP and CQL (Cassandra) packets.
Can anyone tell me what I'm doing wrong here?
java inputstream wireshark pcap pcap4j
asked Nov 19 at 20:08
ggfpc
316
add a comment |
up vote
1
down vote
favorite
I'm trying to build a transparent proxy in Java with the ability to record data that passed through to be viewed later in wireshark.
I was able to get the proxy working correctly with this snippet
private static final int BUFFER_SIZE = 8192;
...
public void run() {
PcapHandle handle = null;
PcapDumper dumper;
try {
InetAddress addr = InetAddress.getByName("localhost");
PcapNetworkInterface nif = Pcaps.getDevByAddress(addr);
int snapLen = 65536;
PcapNetworkInterface.PromiscuousMode mode = PcapNetworkInterface.PromiscuousMode.PROMISCUOUS;
int timeout = 10;
handle = nif.openLive(snapLen, mode, timeout);
dumper = handle.dumpOpen("cap.pcap");
byte buffer = new byte[BUFFER_SIZE];
try {
while (true) {
int bytesRead = mInputStream.read(buffer);
if (bytesRead == -1)
break; // End of stream is reached --> exit
mOutputStream.write(buffer, 0, bytesRead);
dumper.dumpRaw(Arrays.copyOfRange(buffer, 0, bytesRead));
mOutputStream.flush();
}
} catch (IOException e) {
// Read/write failed --> connection is broken
}
dumper.close();
} catch (PcapNativeException e) {
e.printStackTrace();
} catch (UnknownHostException e) {
e.printStackTrace();
} catch (NotOpenException e) {
e.printStackTrace();
}
}
As you may notice I'm using Pcap4J to store raw bytes into a pcap file. The saving of the bytes works well but when I try to open it on wireshark it shows this message:
Error
And every packet shows as malformed. Ideally I would be seeing TCP and CQL (Cassandra) packets.
Can anyone tell me what I'm doing wrong here?
java inputstream wireshark pcap pcap4j
asked Nov 19 at 20:08
ggfpc
316
@KarolDowbecki It's 8192, I edited the post to reflect that.
– ggfpc
Nov 19 at 20:15
Are you running on Windows or Linux ? Check the file correctly starts with the magic bytes as suggested on Hani's blog. The problem can be further, but let's start by the beginning.
– Eugène Adell
Nov 19 at 22:12
@EugèneAdell I'm running Ubuntu. I managed to surpass the error by only writing to the file the amount of data read from the inputstream instead of the full buffer, but every packet looks like an ethernet packet in wireshark instead of CQL
– ggfpc
Nov 20 at 12:36
add a comment |
up vote
1
down vote
favorite
up vote
1
down vote
favorite
I'm trying to build a transparent proxy in Java with the ability to record data that passed through to be viewed later in wireshark.
I was able to get the proxy working correctly with this snippet
private static final int BUFFER_SIZE = 8192;
...
public void run() {
PcapHandle handle = null;
PcapDumper dumper;
try {
InetAddress addr = InetAddress.getByName("localhost");
PcapNetworkInterface nif = Pcaps.getDevByAddress(addr);
int snapLen = 65536;
PcapNetworkInterface.PromiscuousMode mode = PcapNetworkInterface.PromiscuousMode.PROMISCUOUS;
int timeout = 10;
handle = nif.openLive(snapLen, mode, timeout);
dumper = handle.dumpOpen("cap.pcap");
byte buffer = new byte[BUFFER_SIZE];
try {
while (true) {
int bytesRead = mInputStream.read(buffer);
if (bytesRead == -1)
break; // End of stream is reached --> exit
mOutputStream.write(buffer, 0, bytesRead);
dumper.dumpRaw(Arrays.copyOfRange(buffer, 0, bytesRead));
mOutputStream.flush();
}
} catch (IOException e) {
// Read/write failed --> connection is broken
}
dumper.close();
} catch (PcapNativeException e) {
e.printStackTrace();
} catch (UnknownHostException e) {
e.printStackTrace();
} catch (NotOpenException e) {
e.printStackTrace();
}
}
As you may notice I'm using Pcap4J to store raw bytes into a pcap file. The saving of the bytes works well but when I try to open it on wireshark it shows this message:
Error
And every packet shows as malformed. Ideally I would be seeing TCP and CQL (Cassandra) packets.
Can anyone tell me what I'm doing wrong here?
java inputstream wireshark pcap pcap4j
asked Nov 19 at 20:08
ggfpc
316
I'm trying to build a transparent proxy in Java with the ability to record data that passed through to be viewed later in wireshark.
I was able to get the proxy working correctly with this snippet
private static final int BUFFER_SIZE = 8192;
...
public void run() {
PcapHandle handle = null;
PcapDumper dumper;
try {
InetAddress addr = InetAddress.getByName("localhost");
PcapNetworkInterface nif = Pcaps.getDevByAddress(addr);
int snapLen = 65536;
PcapNetworkInterface.PromiscuousMode mode = PcapNetworkInterface.PromiscuousMode.PROMISCUOUS;
int timeout = 10;
handle = nif.openLive(snapLen, mode, timeout);
dumper = handle.dumpOpen("cap.pcap");
byte buffer = new byte[BUFFER_SIZE];
try {
while (true) {
int bytesRead = mInputStream.read(buffer);
if (bytesRead == -1)
break; // End of stream is reached --> exit
mOutputStream.write(buffer, 0, bytesRead);
dumper.dumpRaw(Arrays.copyOfRange(buffer, 0, bytesRead));
mOutputStream.flush();
}
} catch (IOException e) {
// Read/write failed --> connection is broken
}
dumper.close();
} catch (PcapNativeException e) {
e.printStackTrace();
} catch (UnknownHostException e) {
e.printStackTrace();
} catch (NotOpenException e) {
e.printStackTrace();
}
}
As you may notice I'm using Pcap4J to store raw bytes into a pcap file. The saving of the bytes works well but when I try to open it on wireshark it shows this message:
Error
And every packet shows as malformed. Ideally I would be seeing TCP and CQL (Cassandra) packets.
Can anyone tell me what I'm doing wrong here?
java inputstream wireshark pcap pcap4j
java inputstream wireshark pcap pcap4j
asked Nov 19 at 20:08
ggfpc
316
asked Nov 19 at 20:08
ggfpc
316
edited Nov 20 at 12:38
asked Nov 19 at 20:08
ggfpc
316
asked Nov 19 at 20:08
ggfpc
316
asked Nov 19 at 20:08
ggfpc
316
316
@KarolDowbecki It's 8192, I edited the post to reflect that.
– ggfpc
Nov 19 at 20:15
Are you running on Windows or Linux ? Check the file correctly starts with the magic bytes as suggested on Hani's blog. The problem can be further, but let's start by the beginning.
– Eugène Adell
Nov 19 at 22:12
@EugèneAdell I'm running Ubuntu. I managed to surpass the error by only writing to the file the amount of data read from the inputstream instead of the full buffer, but every packet looks like an ethernet packet in wireshark instead of CQL
– ggfpc
Nov 20 at 12:36
add a comment |
@KarolDowbecki It's 8192, I edited the post to reflect that.
– ggfpc
Nov 19 at 20:15
Are you running on Windows or Linux ? Check the file correctly starts with the magic bytes as suggested on Hani's blog. The problem can be further, but let's start by the beginning.
– Eugène Adell
Nov 19 at 22:12
@EugèneAdell I'm running Ubuntu. I managed to surpass the error by only writing to the file the amount of data read from the inputstream instead of the full buffer, but every packet looks like an ethernet packet in wireshark instead of CQL
– ggfpc
Nov 20 at 12:36
@KarolDowbecki It's 8192, I edited the post to reflect that.
– ggfpc
Nov 19 at 20:15
@KarolDowbecki It's 8192, I edited the post to reflect that.
– ggfpc
Nov 19 at 20:15
Are you running on Windows or Linux ? Check the file correctly starts with the magic bytes as suggested on Hani's blog. The problem can be further, but let's start by the beginning.
– Eugène Adell
Nov 19 at 22:12
Are you running on Windows or Linux ? Check the file correctly starts with the magic bytes as suggested on Hani's blog. The problem can be further, but let's start by the beginning.
– Eugène Adell
Nov 19 at 22:12
@EugèneAdell I'm running Ubuntu. I managed to surpass the error by only writing to the file the amount of data read from the inputstream instead of the full buffer, but every packet looks like an ethernet packet in wireshark instead of CQL
– ggfpc
Nov 20 at 12:36
@EugèneAdell I'm running Ubuntu. I managed to surpass the error by only writing to the file the amount of data read from the inputstream instead of the full buffer, but every packet looks like an ethernet packet in wireshark instead of CQL
– ggfpc
Nov 20 at 12:36
add a comment |
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@KarolDowbecki It's 8192, I edited the post to reflect that.
– ggfpc
Nov 19 at 20:15
Are you running on Windows or Linux ? Check the file correctly starts with the magic bytes as suggested on Hani's blog. The problem can be further, but let's start by the beginning.
– Eugène Adell
Nov 19 at 22:12
@EugèneAdell I'm running Ubuntu. I managed to surpass the error by only writing to the file the amount of data read from the inputstream instead of the full buffer, but every packet looks like an ethernet packet in wireshark instead of CQL
– ggfpc
Nov 20 at 12:36