Hi David,
Thanks for your help. I think that I misunderstood how I/O completion port works. I believe that I/O doesn't wait for all specified bytes.
Thanks again.
Elie
At 10:44 AM 6/7/2004 -0700, David Schwartz wrote:
For some reason, my email client didn't want to indent your message. So
I'll put your text on the left and mine indented. Sorry about that.
I think I need to explain my problem a little bit more. I am going to break the problem into 2 parts. Part 1: handshake How do we know how many bytes does the I/O completion port need to read without waiting forever (note that I can solve this problem by reading one byte at a time from the I/O completion port but this is not feasible solution)? Hence I would like to read the header first to get the length of the packet and then read the whole packet before sending it to the (BIO --> SSL_READ) for more processing.
Just post a reasonably-sized buffer, say 2Kb to 8Kb. Give whatever you get
to OpenSSL and ask it if the handshake is finished.
Part 2: My own protocol/messages When we write a packet, the first two bytes of our packet indicates the length of the entire packet. From that, we know how many additional bytes to read to get a complete message. The problem that we face now is that 1) The initial 2 bytes may no longer be 2 bytes after encryption 2) Assuming that we could decrypt those to bytes and find out the length, the length will not match the actual number of bytes sent on the network due to the encryption (i.e. after the packet is encrypted it is larger than the original message size). We are trying to understand how to read the packet using WSARecv since we don't know the actual size of our packet because of the encryption.
Pass it a reasonably-sized buffer, say 2Kb to 8Kb. Give whatever you get to
OpenSSL and ask it if it has any data for you. You are still missing the big
picture -- as far as the encrypted side of the data goes, your job is to be
*invisible* and make it look to OpenSSL like it's seeing a normal TCP
connection.
DS
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Elie Lalo Senior Software Engineer Desktop Technologies Group 1414 Mass Avenue Boxborough, MA 01719 Cisco Systems, Inc. Tel : (978)936-1160 Fax: (978)936-2212 Url : www.cisco.com
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