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27 lines
987 B
Markdown
27 lines
987 B
Markdown
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OpenSSL Simple Echo Client/Server
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This project implements a simple echo client/server.
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It is a console application, with command line parameters determining the mode
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of operation (client or server). Start it with no parameters to see usage.
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The server code was adapted from the Simple TLS Server on the OpenSSL Wiki.
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The server code was modified to perform the echo function, and client code
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was added to open a connection with the server and to send keyboard input
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to the server.
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The new client code illustrates that:
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- Connection to the SSL server starts as a standard TCP 'connect'.
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- Once connected with TCP, the client 'upgrades' to SSL using
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SSL_connect().
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- When the SSL connection completes, data is sent and received using
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SSL_write() and SSL_read().
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- Pretty simple.
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The cert.pem and key.pem files included are self signed certificates with the
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"Common Name" of 'localhost'.
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Best to create the 'pem' files using an actual hostname.
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